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- Trans-Cultural Music Education (11)
- Transkulturelle Musikpädagogik (11)
- Unterrichtsmethoden (11)
- Visualisierung (11)
- anthropology (11)
- atomic force microscopy (11)
- bioinformatics (11)
- bullying (11)
- carbon dioxide (11)
- catchment (11)
- charge transport (11)
- community (11)
- complex networks (11)
- conformational analysis (11)
- confusions and misunderstandings (11)
- correlation (11)
- culture (11)
- cytokines (11)
- dark matter (11)
- degradation (11)
- design thinking (11)
- disease (11)
- emotions (11)
- events (11)
- evidentiality (11)
- exhumation (11)
- exposure (11)
- expression (11)
- fatty acids (11)
- fluorescent probes (11)
- gamma rays: stars (11)
- genomics (11)
- geochronology (11)
- grazing (11)
- hysteresis (11)
- identification (11)
- image processing (11)
- individual-based model (11)
- infants (11)
- ion mobility spectrometry (11)
- justice sensitivity (11)
- lakes (11)
- lamin (11)
- late bilinguals (11)
- lidar (11)
- local adaptation (11)
- metabarcoding (11)
- metabolic syndrome (11)
- metathesis (11)
- methodology (11)
- microcystin (11)
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- palaeogenomics (11)
- phosphorus (11)
- phosphorylation (11)
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- photoluminescence (11)
- plasmas (11)
- postural control (11)
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- regional history (11)
- rehabilitation (11)
- reinforcement learning (11)
- renewable energy (11)
- retrieval (11)
- ring-opening polymerization (11)
- ruthenium (11)
- salivary gland (11)
- scene viewing (11)
- social cognition (11)
- speech and language therapy (11)
- speech production (11)
- stars: winds (11)
- strength (11)
- sulfur (11)
- taxonomy (11)
- technology (11)
- transfer (11)
- trust (11)
- water balance (11)
- öffentliche Verwaltung (11)
- ADHD (10)
- Aimé Bonpland (10)
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- Apis mellifera (10)
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- Design Thinking (10)
- Deutsche Literatur der Frühen Neuzeit (10)
- Doping (10)
- Drama (10)
- Eastern Europe (10)
- Electromyography (10)
- FGF21 (10)
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- Franconia (10)
- Franken (10)
- Future SOC Lab (10)
- GDR (10)
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- Hasso-Plattner-Institut (10)
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- Indien (10)
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- Intertextualität (10)
- Ion mobility spectrometry (10)
- Ionic liquids (10)
- Japan (10)
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- Manganese (10)
- Mars (10)
- MiSpEx (10)
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- Model (10)
- Modelling (10)
- Multicore Architekturen (10)
- Myodes glareolus (10)
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- Naturgefahren (10)
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- Southeast Asia (10)
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- Wilhelm von Humboldt (10)
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- Zeitreihenanalyse (10)
- Zentralasien (10)
- accountability (10)
- adipose tissue (10)
- adolescent (10)
- back pain (10)
- biophysics (10)
- carbon nitride (10)
- chaos (10)
- child (10)
- climate change adaptation (10)
- climate variability (10)
- cluster expansion (10)
- clustering (10)
- co-citation analysis (10)
- complexity (10)
- crisis (10)
- crystallization (10)
- cue-based retrieval (10)
- diatoms (10)
- digital health (10)
- discourse analysis (10)
- dopamine (10)
- elderly (10)
- embodiment (10)
- exhaustivity (10)
- extreme events (10)
- films (10)
- fitness (10)
- food (10)
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- gamma rays: ISM (10)
- gamma-ray burst: general (10)
- gene (10)
- geophysics (10)
- gold nanoparticles (10)
- heat stress (10)
- human behaviour (10)
- human capital (10)
- human physical conditioning (10)
- human rights (10)
- hypertension (10)
- immigration (10)
- ionic liquid (10)
- language production (10)
- leadership (10)
- light pollution (10)
- living cells (10)
- luminescence (10)
- magnetosphere (10)
- manganese (10)
- masked priming (10)
- mental arithmetic (10)
- microsatellites (10)
- middle childhood (10)
- mitigation (10)
- mobility (10)
- molybdenum cofactor (10)
- motor control (10)
- movement ecology (10)
- nonlinear dynamics (10)
- numerische Modellierung (10)
- operational momentum (10)
- organic chemistry (10)
- overweight (10)
- peptide (10)
- peptides (10)
- phylogeography (10)
- plasma (10)
- policy (10)
- potassium (10)
- productivity (10)
- protein folding (10)
- public health (10)
- quantum dots (10)
- representation (10)
- sea-level rise (10)
- second language (10)
- selection (10)
- self-regulation (10)
- senescence (10)
- soil (10)
- solar cells (10)
- spatial-numerical associations (10)
- starch metabolism (10)
- stars (10)
- stars: AGB and post-AGB (10)
- surface plasmon resonance (10)
- teaching (10)
- techniques: imaging spectroscopy (10)
- techniques: photometric (10)
- training load (10)
- visualization (10)
- water quality (10)
- 20th century (9)
- Albert (9)
- Algorithms (9)
- Anpassung (9)
- Antarctica (9)
- Astronomie (9)
- BPMN (9)
- Bacteria (9)
- Bildungswissenschaften (9)
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- Brachionus calyciflorus (9)
- Brownian motion (9)
- Campylomormyrus (9)
- Camus (9)
- Cauchy problem (9)
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- Datenintegration (9)
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- Diabetes (9)
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- E-Government (9)
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- Ecuador (9)
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- Ernährung (9)
- Eye tracking (9)
- Fragmentation (9)
- Frauen (9)
- Geographie-Didaktik (9)
- Geographie-Studium (9)
- Geographie-Unterricht (9)
- Gold (9)
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- Holozän (9)
- ISM: structure (9)
- Indian summer monsoon (9)
- Infancy (9)
- Information structure (9)
- Insulin resistance (9)
- Interactional Linguistics (9)
- Inverse theory (9)
- Kalman filter (9)
- Kartographie (9)
- Klimaanpassung (9)
- Kohlenstoff (9)
- Konstruktivismus (9)
- Konversationsanalyse (9)
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- Metabolomics (9)
- Metzler Handbuch 2.0 (9)
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- Namibia (9)
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- algae (9)
- allometry (9)
- antibody (9)
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- biofilm (9)
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- biomineralization (9)
- block copolymer (9)
- business process management (9)
- cardiovascular disease (9)
- cell adhesion (9)
- cellulose (9)
- change (9)
- charge transfer (9)
- chromatin (9)
- clefts (9)
- comparison (9)
- competence (9)
- conservation genetics (9)
- coronary artery disease (9)
- cosmology: observations (9)
- cultural science (9)
- dark ages, reionization, first stars (9)
- data integration (9)
- decision making (9)
- deutsche Außenpolitik (9)
- diet (9)
- disturbance (9)
- ecosystems (9)
- educational sciences (9)
- efficiency (9)
- electron transfer (9)
- elliptic operators (9)
- enzymes (9)
- ethnicity (9)
- executive function (9)
- executive functions (9)
- flexibility (9)
- food web (9)
- forest management (9)
- frequency (9)
- galaxies: interactions (9)
- galaxies: starburst (9)
- geochemistry (9)
- hybridization (9)
- immobilization (9)
- inclusive education (9)
- inference (9)
- inhibition (9)
- insect (9)
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- isometric muscle action (9)
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- knowledge (9)
- locality (9)
- membrane (9)
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- microscopy (9)
- microstructure (9)
- mixed methods (9)
- moderne jüdische Geschichte (9)
- mtDNA (9)
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- neuromuscular control (9)
- neuroplasticity (9)
- organization (9)
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- physiology (9)
- plasmonics (9)
- polyunsaturated fatty acids (9)
- polyzwitterion (9)
- population (9)
- preparedness (9)
- preview benefit (9)
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- proteomics (9)
- race (9)
- reactive transport (9)
- relation historique (9)
- reproducibility (9)
- resources (9)
- responses (9)
- seed dispersal (9)
- self-esteem (9)
- sexual scripts (9)
- signal transduction (9)
- site effects (9)
- skills (9)
- slavic countries (9)
- social inclusion (9)
- species richness (9)
- stars: kinematics and dynamics (9)
- stars: rotation (9)
- structure (9)
- surface chemistry (9)
- surface modification (9)
- suspended sediment (9)
- techniques: polarimetric (9)
- ultrafast (9)
- waves (9)
- weather (9)
- Öffentliche Verwaltung (9)
- α-amylase/trypsin inhibitors (9)
- 1814-1831 (8)
- ACT-R (8)
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- Assessment (8)
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- Cosmogenic nuclides (8)
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- Deformation (8)
- Degradation (8)
- Dezentralisierung (8)
- Direct electron transfer (8)
- Discussion (8)
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- E. coli (8)
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- Latein (8)
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- Ludwig Leichhardt (8)
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- Prediction (8)
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- Sentence comprehension (8)
- Service-oriented Systems Engineering (8)
- Sphingolipids (8)
- Sport (8)
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- Through-space NMR shieldings (TSNMRS) (8)
- Twitter (8)
- Unsicherheit (8)
- Validation (8)
- Vitamin A (8)
- Wahlen (8)
- X-ray refraction (8)
- X-ray structure (8)
- Younger Dryas (8)
- Youth (8)
- Zeitgenossen (8)
- Zentraleuropa (8)
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- acceleration (8)
- acculturation (8)
- alien species (8)
- amerikanische Reisetagebücher (8)
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- bicameralism (8)
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- cardiovascular diseases (8)
- cell-free protein synthesis (8)
- cells (8)
- chemistry (8)
- chemotaxis (8)
- chronic kidney disease (8)
- climate impacts (8)
- climate-change mitigation (8)
- cloud (8)
- coherence (8)
- complex systems (8)
- consistency (8)
- control (8)
- convection (8)
- conversation analysis (8)
- cortisol (8)
- cytotoxicity (8)
- data profiling (8)
- density functional calculations (8)
- dielectrophoresis (8)
- digitale Medien (8)
- dissociative electron attachment (8)
- distribution (8)
- electrospinning (8)
- energy (8)
- energy policy (8)
- energy storage (8)
- ensemble Kalman filter (8)
- ethics (8)
- experiments (8)
- extension (8)
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- feminism (8)
- fiscal policy (8)
- flood (8)
- flow (8)
- fluorescence correlation spectroscopy (8)
- force (8)
- fractional Brownian motion (8)
- galaxies (8)
- galaxies: dwarf (8)
- gamma-rays: galaxies (8)
- gender differences (8)
- genetics (8)
- grain size (8)
- graphene (8)
- heart rate variability (8)
- home range (8)
- imaging (8)
- injury risk (8)
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- isomerization (8)
- land use change (8)
- landscape of fear (8)
- language contact (8)
- light (8)
- magnetism (8)
- major depressive disorder (8)
- malnutrition (8)
- mathematical modeling (8)
- mathematische Modellierung (8)
- maximal isometric Adaptive Force (8)
- meaning (8)
- measurement (8)
- mechanisms (8)
- mechanobiology (8)
- media violence (8)
- membranes (8)
- metabolite profiling (8)
- methane (8)
- microfluidics (8)
- microtubules (8)
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- modality (8)
- morphological processing (8)
- multicore architectures (8)
- muscle (8)
- music (8)
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- natural products (8)
- noise (8)
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- nuclear lamina (8)
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- oscillations (8)
- outflows (8)
- pain (8)
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- perceptual span (8)
- perturbation (8)
- phase transition (8)
- phonological awareness (8)
- photoelectron spectroscopy (8)
- physics (8)
- plankton (8)
- plant diversity (8)
- polarization (8)
- polyelectrolyte (8)
- pregnancy (8)
- production (8)
- production control (8)
- programming (8)
- pronouns (8)
- propensity score matching (8)
- proteasome (8)
- psychotherapy training (8)
- public sector (8)
- pulsars: general (8)
- quality (8)
- quality assurance (8)
- quantification (8)
- quasars: general (8)
- reanalysis (8)
- recombination (8)
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- restoration (8)
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- rotation (8)
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- sedimentary ancient DNA (8)
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- soil organic carbon (8)
- spatial frequencies (8)
- stars: activity (8)
- stars: emission-line, Be (8)
- surveillance (8)
- sustainable development (8)
- taste (8)
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- techniques: image processing (8)
- thermokarst (8)
- time series (8)
- time-series (8)
- topography (8)
- tracking (8)
- treeline (8)
- trends (8)
- urbanization (8)
- variation (8)
- ventral striatum (8)
- verification (8)
- vitamin A (8)
- wh-questions (8)
- work (8)
- yellow flags (8)
- youth sports (8)
- Abrüstung (7)
- Agency (7)
- Algeria (7)
- Alps (7)
- Anisotropy (7)
- Anisotropy effect (7)
- Antike (7)
- Apoptosis (7)
- Aromaticity (7)
- Aufmerksamkeit (7)
- Balance (7)
- Bewegung (7)
- Blockcopolymere (7)
- Botanik (7)
- Brasilien (7)
- CO2 (7)
- COVID-19 pandemic (7)
- Capsella (7)
- Clusteranalyse (7)
- Complex networks (7)
- Complexity (7)
- Crustal structure (7)
- Cytotoxicity (7)
- DNA radiation damage (7)
- Decision-making (7)
- Dekonstruktion (7)
- Democracy (7)
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- Design (7)
- Deutschdidaktik (7)
- Digitale Plattformen (7)
- Dirac operator (7)
- Diskriminierung (7)
- Diskurs (7)
- Disturbance (7)
- East African Rift System (7)
- Egypt (7)
- Emulsion (7)
- Erziehungswissenschaften (7)
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- Fachwissen (7)
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- Herrschaft (7)
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- Klimaänderung (7)
- Kompetenzen (7)
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- Massenspektrometrie (7)
- Mekong Delta (7)
- Memory (7)
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- Microtubules (7)
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- Molecularly imprinted polymers (7)
- Molybdenum cofactor (7)
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- Palästina (7)
- Parteien (7)
- Pavlovian-to-instrumental transfer (7)
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- RIXS (7)
- Raman (7)
- Reading motivation (7)
- Remote sensing (7)
- Resistance training (7)
- Resozialisierung (7)
- Return to work (7)
- Rheologie (7)
- Ring current effect (7)
- Risiko (7)
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- Security Policy (7)
- Seesedimente (7)
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- Solanaceae (7)
- Sprachwandel (7)
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- Starch metabolism (7)
- Stickstoff (7)
- Survey (7)
- Switzerland (7)
- Synthesis (7)
- Tagebuch (7)
- Theory (7)
- Tien Shan (7)
- Time series (7)
- Time series analysis (7)
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- age of acquisition (7)
- aggregation (7)
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- algorithms (7)
- alignment (7)
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- amygdala (7)
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- extraction (7)
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- floodplain (7)
- food webs (7)
- function (7)
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- gene flow (7)
- geodynamics (7)
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- kinematics (7)
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- mapping (7)
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- scattering (7)
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- tomography (7)
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- copolymers (6)
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- sodium (6)
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- state (6)
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- surface relief grating (6)
- tailspike protein (6)
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- trade-offs (6)
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- tundra (6)
- type 2 diabetes mellitus (6)
- uncertainty quantification (6)
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- validation study (6)
- vesicle (6)
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- 3D point clouds (5)
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- Finanzmärkte (5)
- Fire-bellied toad (5)
- Flow cytometry (5)
- Flow-Erleben (5)
- Fluorescence imaging (5)
- Fluoreszenzmikroskopie (5)
- Fokker-Planck equation (5)
- Food quality (5)
- Frailty (5)
- Frauenliteratur (5)
- Free Group (5)
- French (5)
- Functional ankle instability (5)
- G-protein-coupled receptor (5)
- GABA (5)
- GPCR (5)
- Galaxy: center (5)
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- Genregulation (5)
- Geochemie (5)
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- Givenness (5)
- Glucose (5)
- Gold nanoparticles (5)
- Graph theory (5)
- Grassland (5)
- Grenzen (5)
- Ground reaction force (5)
- Growth (5)
- Grundwasser (5)
- HSFA2 (5)
- HVSR (5)
- Habitat fragmentation (5)
- Heart rate variability (5)
- Heiner Müller (5)
- Hermeneutik (5)
- Heterocycles (5)
- Holding isometric muscle action (5)
- Humanismus (5)
- Humankapital (5)
- Humboldt und Hispanoamerika (5)
- IAT (5)
- IR-MALDI (5)
- ISM: jets and outflows (5)
- ISM: lines and bands (5)
- ISM: magnetic fields (5)
- Identitätsmanagement (5)
- Imaging (5)
- Immanuel Kant (5)
- Inclusion (5)
- Index (5)
- Individual-based models (5)
- Informatikdidaktik (5)
- Infrastruktur (5)
- Insect (5)
- Insekten (5)
- Ionosphere (5)
- Janus emulsions (5)
- Jaspers (5)
- KMU (5)
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- Klimaveränderung (5)
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- Korrosion (5)
- Kunst (5)
- Körper (5)
- L2 (5)
- L2 processing (5)
- LCST (5)
- LC–MS/MS (5)
- Labour market (5)
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- Ladungstransport (5)
- Land-use intensity (5)
- Landslides (5)
- Langmuir monolayer (5)
- Language production (5)
- Larix (5)
- Late Holocene (5)
- Lebensqualität (5)
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- Lonar Lake (5)
- MQTT (5)
- Macht (5)
- Magnetostratigraphy (5)
- Marktübersicht (5)
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- Menschenrechtsverletzungen (5)
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- Methoden (5)
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- Moco biosynthesis (5)
- Modernization (5)
- Molekulardynamik (5)
- Momententensor (5)
- Mongolei (5)
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- Mythos (5)
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- NW Argentina (5)
- Nachruf (5)
- National Socialism (5)
- Nationalismus (5)
- Natural language processing (5)
- Negotiation (5)
- Neo-Tethys (5)
- Nepal (5)
- Network clustering (5)
- Netzwerkanalyse (5)
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- Nonlinear Dynamics (5)
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- O2C spectrophotometer (5)
- OLED (5)
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- Organic solar cells (5)
- Organisationen (5)
- PLSR (5)
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- Permian (5)
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- Ph.D. retreat (5)
- Philipp Melanchthon (5)
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- Pinus sylvestris (5)
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- Plattdeutsch (5)
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- Political System (5)
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- Process (5)
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- Public Service Motivation (5)
- Pushing isometric muscle action (5)
- Quantengravitation (5)
- Quantum chemical calculations (5)
- RNA (5)
- RNA-Seq (5)
- RNAseq (5)
- ROS (5)
- RPA (5)
- Radiation belts (5)
- Rechtschreibung (5)
- Rede (5)
- Reformation (5)
- Regulation (5)
- Reiseliteratur (5)
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- Resonant inelastic X-ray scattering (5)
- Respiration (5)
- Revolution (5)
- Risikoanalyse (5)
- Risikofaktoren (5)
- Risk assessment (5)
- Risk reduction (5)
- Rohstoffe (5)
- Romantik (5)
- Rumänien (5)
- Russland-Tagebuch (5)
- Röntgenbeugung (5)
- SAR (5)
- SDGs (5)
- SRTM (5)
- STM (5)
- SWAT (5)
- Sachsen (5)
- Salmonella (5)
- Scattering (5)
- Schriftspracherwerb (5)
- Schweden (5)
- Schwerpunktthema „À propos Kehlmann“ (5)
- Screening (5)
- Security Council (5)
- Seismic attenuation (5)
- Seismotektonik (5)
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- Self-regulation (5)
- Sensitivity analysis (5)
- Sentence reading (5)
- Sexual aggression (5)
- Simulations (5)
- Slavistik (5)
- Softwareentwicklung (5)
- Solar cells (5)
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- Sozialismus (5)
- Species richness (5)
- Speicheldrüse (5)
- Sphingosine-1-phosphate (5)
- Sprachbildung (5)
- Sprachgeschichte (5)
- Sprachverständnis (5)
- Staatsrecht (5)
- Stochastische Prozesse (5)
- Strahlungstransport (5)
- Strontium isotope stratigraphy (5)
- Stärke (5)
- Supervision (5)
- System (5)
- Systematic review (5)
- Südamerika (5)
- Tagung (5)
- Tarim Basin (5)
- Tectonic geomorphology (5)
- Temperatur (5)
- TerraceM (5)
- Thin film (5)
- Throughfall (5)
- Ti-6Al-4V (5)
- Tian Shan (5)
- TransArea Studies (5)
- Transdisziplinarität (5)
- Transfer function (5)
- Transkriptionsfaktor (5)
- Tropen (5)
- Trust (5)
- Tsunami (5)
- Türkisch (5)
- UN (5)
- US foreign policy (5)
- Ultrafast X-ray diffraction (5)
- Ultrasound (5)
- Universität (5)
- Unternehmen (5)
- Validity (5)
- Variabilität (5)
- Vergangenheitsbewältigung (5)
- Verifikation (5)
- Vertrauen (5)
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- Videoanalyse (5)
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- Virus (5)
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- Vogtland (5)
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- Vulnerability (5)
- Wasserhaushalt (5)
- Wissen (5)
- Word frequency (5)
- Workplace (5)
- X-ray absorption (5)
- X-ray absorption spectroscopy (5)
- X-ray photoelectron spectroscopy (5)
- X-ray spectroscopy (5)
- Xanthomonas (5)
- Zelladhäsion (5)
- Zentralanden (5)
- Zweitveröffentlichung (5)
- absorption (5)
- academic self-concept (5)
- acceptance (5)
- accumulation (5)
- actin (5)
- action observation (5)
- activated carbon (5)
- acute coronary syndrome (5)
- acute kidney injury (5)
- adaptability (5)
- adhesion (5)
- adiponectin (5)
- administrative reforms (5)
- agility (5)
- agricultural landscapes (5)
- alcohol consumption (5)
- alternatives (5)
- anger regulation (5)
- angiogenesis (5)
- anisotropy (5)
- anorexia nervosa (5)
- anthracenes (5)
- antibiotic resistance (5)
- antidepressants (5)
- antiplasmodial (5)
- aptamers (5)
- aquatic fungi (5)
- array seismology (5)
- artifical intelligence (5)
- association (5)
- associations (5)
- attribution (5)
- autocorrelation (5)
- autocracy (5)
- autophagy (5)
- avoidance (5)
- bacteriophage (5)
- basin (5)
- beliefs (5)
- benzaldehyde (5)
- biological invasions (5)
- biomarkers (5)
- biosynthesis (5)
- body composition (5)
- body waves (5)
- buildings (5)
- burnout (5)
- calculation (5)
- carbon cycling (5)
- cartography (5)
- catalysts (5)
- categories (5)
- cell wall (5)
- cell-based assay (5)
- change management (5)
- change of direction (5)
- charge-transfer (5)
- child language (5)
- chitosan (5)
- circular dichroism (5)
- citation analysis (5)
- citizenship (5)
- civil society (5)
- civil war (5)
- civil-military relations (5)
- climate warming (5)
- clinical supervision (5)
- coarticulation (5)
- codon usage (5)
- coffee by-products (5)
- collapse (5)
- colloids (5)
- comets: general (5)
- common vole (5)
- communities (5)
- community effect on height (5)
- comorbidity (5)
- competencies (5)
- compliance (5)
- composites (5)
- computational linguistics (5)
- confinement (5)
- conflict resolution (5)
- conjugated polymers (5)
- consequences (5)
- construct validity (5)
- construction (5)
- constructivism (5)
- contracts (5)
- conversational agents (5)
- coping strategies (5)
- coronary heart disease (5)
- corpus linguistics (5)
- corrosion (5)
- cosmic-ray neutron sensing (5)
- cosmology: theory (5)
- counting (5)
- crop production (5)
- cultural pluralism (5)
- cyclic voltammetry (5)
- cytosine methylation (5)
- data preparation (5)
- data quality (5)
- deep reinforcement learning (5)
- definite pseudoclefts (5)
- democratic theory (5)
- demographic change (5)
- demography (5)
- dependencies (5)
- diagnostics (5)
- differentiation (5)
- digital learning (5)
- digital rock physics (5)
- digital technologies (5)
- digitale Transformation (5)
- direct electron transfer (5)
- disability (5)
- disaster risk reduction (5)
- distributed systems (5)
- dogs (5)
- drop jump (5)
- drought stress (5)
- drug delivery (5)
- drugs (5)
- duration (5)
- dynamic NMR (5)
- e-government (5)
- earthquakes (5)
- eating behavior (5)
- eating disorders (5)
- ecological speciation (5)
- elections (5)
- electron microscopy (5)
- electron paramagnetic resonance (5)
- electronic structure (5)
- electropolymerization (5)
- elevated CO2 (5)
- ellipsis processing (5)
- elliptic complexes (5)
- ellipticity (5)
- emotion recognition (5)
- emulsion (5)
- emulsion polymerization (5)
- energy expenditure (5)
- energy metabolism (5)
- entity resolution (5)
- environment (5)
- environmental DNA (5)
- equality (5)
- equatorial electrojet (5)
- evapotranspiration (5)
- event coincidence analysis (5)
- expectation (5)
- expectations (5)
- eye-movement control (5)
- family (5)
- fatty acid (5)
- feature selection (5)
- ferroelectret (5)
- field (5)
- filaments (5)
- film (5)
- finger counting (5)
- fire (5)
- firm performance (5)
- fish (5)
- flood risk management (5)
- fluctuations (5)
- food choice (5)
- foraging (5)
- frailty (5)
- freedom (5)
- frequency analysis (5)
- fruit (5)
- functionalization (5)
- galaxies: haloes (5)
- galaxies: halos (5)
- galaxies: nuclei (5)
- gene regulation (5)
- genetic diversity (5)
- geovisualization (5)
- giftedness (5)
- globular clusters: general (5)
- government (5)
- grammaticalization (5)
- graph theory (5)
- ground reaction force (5)
- grounded cognition (5)
- groundwater recharge (5)
- gut microbiota (5)
- habitat use (5)
- heart failure (5)
- heart rate (5)
- height (5)
- hemocompatibility (5)
- hemoglobin amount (5)
- heritage language (5)
- heteroatoms (5)
- heterosis (5)
- heuristics (5)
- homeostasis (5)
- hospitals (5)
- human-computer interaction (5)
- hydrogen peroxide (5)
- hydrological modeling (5)
- hydrological modelling (5)
- hydropower (5)
- hydrothermal (5)
- hydroxyapatite (5)
- hyperspectral (5)
- hypochondriasis (5)
- hyporheic zone (5)
- ice-sheet (5)
- identity management (5)
- immunoassay (5)
- implementation (5)
- impulsivity (5)
- in-memory technology (5)
- in-situ (5)
- index theory (5)
- industry 4.0 (5)
- infection pathway (5)
- infinite-dimensional Brownian diffusion (5)
- infrastructure (5)
- inheritance (5)
- inorganic perovskites (5)
- insects (5)
- institutional design (5)
- integral field spectroscopy (5)
- inter-individual differences (5)
- intercultural competence (5)
- interest (5)
- interface (5)
- international cooperation (5)
- intersectionality (5)
- intimate partner violence (5)
- intraspecific trait variation (5)
- inundation (5)
- ionische Flüssigkeiten (5)
- ionosphere (5)
- island biogeography (5)
- justice (5)
- komplexe Netzwerke (5)
- kosmogene Nuklide (5)
- landscape (5)
- language change (5)
- language comprehension (5)
- laser powder bed fusion (5)
- laterality (5)
- leaf (5)
- learning environment (5)
- lexical access (5)
- lexicon size (5)
- lifestyle (5)
- linear mixed models (5)
- linear term (5)
- lipid membranes (5)
- lipidomics (5)
- lipopolysaccharide (5)
- liposomes (5)
- livestock (5)
- local governance (5)
- local time (5)
- localization (5)
- long-term effects (5)
- mHealth (5)
- machine (5)
- macrophages (5)
- magnetohydrodynamics (5)
- magnetostratigraphy (5)
- manufacturing (5)
- maturity (5)
- mechanical properties (5)
- metabolic engineering (5)
- metabolic network (5)
- metabolic regulation (5)
- metacognition (5)
- metagenomics (5)
- metal (5)
- metal-organic frameworks (5)
- methanogenic archaea (5)
- methods: statistical (5)
- miRNAs (5)
- microbial interactions (5)
- microbiology (5)
- microcontact printing (5)
- microgels (5)
- micronutrients (5)
- microparticles (5)
- microsaccades (5)
- microsimulation (5)
- middleware (5)
- mineralization (5)
- minimum wage (5)
- mitochondrial genome (5)
- modernization (5)
- molecular evolution (5)
- molekulare Motoren (5)
- monoclonal antibodies (5)
- morphologically complex words (5)
- mouse (5)
- multiblock copolymer (5)
- multiplicative noise (5)
- museum specimens (5)
- musicality (5)
- myth (5)
- n-alkanes (5)
- narrative (5)
- natural hazard (5)
- neovascularization (5)
- neuromuscular (5)
- neurotoxicity (5)
- new species (5)
- next-generation sequencing (5)
- non-alcoholic fatty liver disease (5)
- non-state actors (5)
- nonlinear time series analysis (5)
- norepinephrine (5)
- oncology (5)
- online (5)
- online hate (5)
- ontology (5)
- opposition (5)
- optimism (5)
- organizations (5)
- outcome (5)
- oxidation (5)
- paleomagnetism (5)
- parental mediation (5)
- partial melting (5)
- participatory research (5)
- particle acceleration (5)
- particle-in-cell simulations (5)
- pathways (5)
- peacekeeping (5)
- perceptual reorganization (5)
- periodization (5)
- permafrost degradation (5)
- permafrost thaw (5)
- permeability (5)
- peroxides (5)
- phase (5)
- phase separation (5)
- phenotyping (5)
- phonology (5)
- photophysics (5)
- photovoltaics (5)
- physical performance (5)
- physics education (5)
- planet-star interactions (5)
- planets and satellites: atmospheres (5)
- plant community (5)
- plant functional trait (5)
- plant functional traits (5)
- plateau (5)
- plyometric exercise (5)
- policy advice (5)
- politeness (5)
- political education (5)
- pollination (5)
- poly(lactic acid) (5)
- polyethylene (5)
- polymer chemistry (5)
- polymer degradation (5)
- polymorphism (5)
- polypropylene (5)
- population genomics (5)
- populations (5)
- populism (5)
- pornography (5)
- positive selection (5)
- postural sway (5)
- poverty (5)
- preferences (5)
- preschool children (5)
- pressure (5)
- private households (5)
- probabilistic (5)
- problem solving (5)
- professionalization (5)
- protein-protein interactions (5)
- psychometric properties (5)
- psychotherapy process (5)
- pupillometry (5)
- purification (5)
- qualitative analysis (5)
- qualitative content analysis (5)
- qualitative research (5)
- quantitative Analyse (5)
- quantitative analysis (5)
- quantum field theory (5)
- radicals (5)
- random diffusivity (5)
- random-walks (5)
- range shifts (5)
- rare earth elements (5)
- reading comprehension (5)
- real-time rendering (5)
- record (5)
- reflexives (5)
- refugee (5)
- regional development (5)
- regression (5)
- reionization (5)
- rejection sensitivity (5)
- relational aggression (5)
- relativistic jets (5)
- repetition (5)
- replication (5)
- representation learning (5)
- reproductive success (5)
- research data management (5)
- resonance energy transfer (5)
- resource competition (5)
- reversible measure (5)
- rhythmic grouping (5)
- rice (5)
- risk analysis (5)
- risk communication (5)
- risk management (5)
- risk-factors (5)
- rivers (5)
- root traits (5)
- rotifers (5)
- rural (5)
- salicylic acid (5)
- scaling (5)
- scenario (5)
- scenarios (5)
- school shooting (5)
- science (5)
- seed bank (5)
- seismic noise (5)
- selectivity (5)
- self-employment (5)
- self-evaluation (5)
- semi-arid (5)
- semi-parliamentary government (5)
- sentence reading (5)
- sentiment analysis (5)
- service-oriented systems engineering (5)
- sexual victimization (5)
- shape-memory polymers (5)
- shotgun sequencing (5)
- silica (5)
- single-particle tracking (5)
- smart contracts (5)
- social (5)
- social acceptance (5)
- social inequality (5)
- social network (5)
- social networking sites (5)
- sociolinguistics (5)
- sol-gel (5)
- space (5)
- spatial autocorrelation (5)
- spatial cognition (5)
- spatial-distribution (5)
- species coexistence (5)
- species distribution models (5)
- spectral analysis (5)
- spectral flow (5)
- speech motor control (5)
- sphingosine-1-phosphate (5)
- sport-specific performance (5)
- standards (5)
- starch phosphorylation (5)
- stars: chemically peculiar (5)
- stars: distances (5)
- stars: formation (5)
- stars: mass loss (5)
- statistical physics (5)
- statistical seismology (5)
- stellar activity (5)
- stochastic models (5)
- stochastic resetting (5)
- strategic growth adjustments (5)
- strategy (5)
- streamflow (5)
- striking combat sports (5)
- students (5)
- stunting (5)
- sulfate reduction (5)
- supergiants (5)
- supernovae: general (5)
- superstatistics (5)
- surface processes (5)
- surface-enhanced Raman scattering (5)
- surfaces (5)
- survey (5)
- synthetische Biologie (5)
- tRNA (5)
- tax reform (5)
- tectonic geomorphology (5)
- telemedicine (5)
- theory of mind (5)
- thermal modeling (5)
- thermodynamic stability (5)
- tiefes Lernen (5)
- top-down control (5)
- trajectories (5)
- transparency (5)
- trend analysis (5)
- tunneling (5)
- tyramine (5)
- ultraviolet: ISM (5)
- uncertainties (5)
- upconversion (5)
- urban (5)
- usability (5)
- vegetation change (5)
- victim blame (5)
- video games (5)
- virtual machines (5)
- virus (5)
- visual culture (5)
- visual word recognition (5)
- vocational training (5)
- voltage losses (5)
- weather extremes (5)
- weight (5)
- welfare (5)
- wetland (5)
- workplace (5)
- xanthine dehydrogenase (5)
- Ägypten (5)
- Öffentlicher Sektor (5)
- Öffentlichkeit (5)
- ökologische Modellierung (5)
- 1799 (4)
- 1804 (4)
- 1830 (4)
- 1831 (4)
- 1849 (4)
- 2nd-language (4)
- 3D-Visualisierung (4)
- 4 (4)
- ABC transporter (4)
- ASIC (4)
- Academic achievement (4)
- Academic self-concept (4)
- Achilles tendon (4)
- Actin cytoskeleton (4)
- Active tectonics (4)
- Adipose tissue (4)
- Aerosol (4)
- Aerosols (4)
- Affordances (4)
- Agrammatism (4)
- Agreement (4)
- Akzeptanz (4)
- Alborz Mountains (4)
- Alejandro de Humboldt en México (4)
- Alexander-von-Humboldt-Forschungsstelle (4)
- Alexithymia (4)
- Alignment (4)
- Allometry (4)
- Alzheimer (4)
- Amerika-Reise (4)
- Amino acids (4)
- Amphibia (4)
- Analyse (4)
- Andreas Gryphius (4)
- Ankle sprain (4)
- Anreize (4)
- Ansichten der Kordilleren und Monumente der eingeborenen Völker Amerikas (4)
- Ansichten der Natur (4)
- Anthropocene (4)
- Anthropogene Klimaänderung (4)
- Antifouling (4)
- Antiplasmodial (4)
- Arabidopsis-thaliana (4)
- Aral Sea (4)
- Arbeitslosigkeit (4)
- Aridity (4)
- Arsenic (4)
- Arsenic-containing fatty acids (4)
- Asie Centrale (4)
- Astroteilchenphysik (4)
- Atlantic meridional overturning circulation (4)
- Atlantic studies (4)
- Atmosphere (4)
- Attrition (4)
- Augenbewegungen (4)
- Augmented reality (4)
- Ausbreitung (4)
- Auslandseinsatz (4)
- Automatisierung (4)
- Auxin (4)
- Averroes (4)
- Avé-Lallemant (4)
- Azobenzene (4)
- BDNF (4)
- BRD (4)
- Bakteriophagen (4)
- Bayesian analysis (4)
- Bayesian estimation (4)
- Bedeutung (4)
- Bergbau (4)
- Beschleunigung (4)
- Beschäftigungspolitik (4)
- Betriebssysteme (4)
- Bewertung (4)
- Biaryls (4)
- Bibliographie der selbstständigen Schriften (4)
- Bibliometrie (4)
- Biofilms (4)
- Biogeographie (4)
- Biografie (4)
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- cleft (4)
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- code (4)
- coefficient (4)
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- community structure (4)
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- conductivity (4)
- confidence (4)
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- confocal microscopy (4)
- conformation (4)
- consumer behavior (4)
- content areas (4)
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- content-addressable memory (4)
- conversion (4)
- convolutional neural network (4)
- copper(II) (4)
- core (4)
- coreference (4)
- cosmology (4)
- coupling (4)
- covariance (4)
- creep (4)
- critical theory (4)
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- cross-cultural comparison (4)
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- crust (4)
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- cyberbullying victimization (4)
- cylindrospermopsin (4)
- cytochrome c (4)
- data mining (4)
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- debugging (4)
- deep-sea (4)
- definition (4)
- deforestation (4)
- deformation (4)
- degenerative disc disease (4)
- dependence (4)
- deposition (4)
- deutsch-jüdische Geschichte (4)
- developing countries (4)
- diabetes mellitus (4)
- diachrony (4)
- diagnostic competence (4)
- dictator game (4)
- dictyostelium (4)
- differential operators (4)
- digital sovereignty (4)
- digitization (4)
- discourse production (4)
- distress (4)
- diversification (4)
- dog (4)
- downscaling (4)
- dropout (4)
- drylands (4)
- dual-process (4)
- dyadic coping (4)
- dye (4)
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- dynamo (4)
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- eco-evolutionary experience (4)
- edge effect (4)
- effect (4)
- electrical conductivity (4)
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- electron-transfer (4)
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- elite athlete (4)
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- emissions (4)
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- endophytes (4)
- endurance exercise (4)
- enhancement (4)
- entanglement (4)
- environmental economics (4)
- environmental filtering (4)
- environmental policy (4)
- equation (4)
- equifinality (4)
- errata, addenda (4)
- ethnic differences (4)
- ethnic identity (4)
- evaluative study (4)
- evaporites (4)
- event-related brain potentials (4)
- everyday life (4)
- evolutionary history (4)
- exchange (4)
- executive personalism (4)
- exercise intensity (4)
- expansion microscopy (4)
- experimental design (4)
- exploratory-behavior (4)
- extracellular matrix (4)
- extremophiles (4)
- eye-movement monitoring (4)
- face perception (4)
- fatty acid metabolism (4)
- fatty-acids (4)
- fault (4)
- faults (4)
- fence ecology (4)
- ferroelectrets (4)
- ferroelectric polymers (4)
- ferroelectricity (4)
- financial crisis (4)
- financial institutions (4)
- first language acquisition (4)
- first-passage (4)
- fiscal federalism (4)
- fixation durations (4)
- flavonoid (4)
- floral scent (4)
- flower development (4)
- fluctuating light (4)
- fluid inclusions (4)
- focal adhesion (4)
- food neophilia (4)
- forecast (4)
- forest (4)
- formal verification (4)
- forschendes Lernen (4)
- fractional dynamics (4)
- fracture (4)
- friendship (4)
- frustration (4)
- fsQCA (4)
- functional response (4)
- fundamental frequency (4)
- fungi (4)
- galaxies: fundamental parameters (4)
- galaxies: star formation (4)
- garden-path effect (4)
- gaze-contingent displays (4)
- gender pay gap (4)
- gene regulatory networks (4)
- genealogy (4)
- genome-wide association (4)
- geodynamic modeling (4)
- geography (4)
- geomagnetic field (4)
- geomorphometry (4)
- geothermal (4)
- geothermal energy (4)
- glaciers (4)
- global jets (4)
- global positioning system (4)
- global sensitivity analysis (4)
- glomerular filtration rate (4)
- glucose oxidation (4)
- glucosinolates (4)
- glutathione (4)
- glycopolymers (4)
- good governance (4)
- graph transformation (4)
- graph transformation systems (4)
- graphs (4)
- ground-penetrating radar (4)
- group field theory (4)
- handgrip strength (4)
- handwriting (4)
- hantavirus (4)
- hazard (4)
- health care (4)
- healthcare (4)
- helical magnetic fields (4)
- hemispheric asymmetry (4)
- heterostyly (4)
- heterotrophic bacteria (4)
- high-intensity interval training (4)
- historiography (4)
- holding isometric muscle action (HIMA) (4)
- hormones (4)
- housing (4)
- hybrid (4)
- hybrid perovskites (4)
- hydrological models (4)
- hypoxia (4)
- ill-posed problem (4)
- imitation (4)
- immigrants (4)
- immune system (4)
- immunology (4)
- implicit attitude (4)
- in vitro (4)
- in-service teacher training (4)
- individual (4)
- inertial measurement unit (4)
- inflammatory bowel disease (4)
- informatics (4)
- institutional reform (4)
- insulin signaling (4)
- interactional linguistics (4)
- interception (4)
- interference control (4)
- international (4)
- international bureaucracies (4)
- international organisations (4)
- international trade (4)
- internationale Beziehungen (4)
- internationaler Handel (4)
- intrinsic motivation (4)
- intrusion detection (4)
- inverse analysis (4)
- inverse problem (4)
- ionic conductivity (4)
- ionic strength (4)
- job satisfaction (4)
- joint Simon effect (4)
- joint action (4)
- karst (4)
- kernel methods (4)
- kidney (4)
- kidney transplantation (4)
- knickpoint (4)
- knowledge sharing (4)
- komplexe Systeme (4)
- körperliche Aktivität (4)
- lactate (4)
- land-use intensity (4)
- large-scale assessment (4)
- large-scale structure of Universe (4)
- laser pulses (4)
- left periphery (4)
- lexical development (4)
- lexicon (4)
- lichens (4)
- life satisfaction (4)
- lifetime income (4)
- light variability (4)
- line: identification (4)
- linear hypersubstitution (4)
- literacy acquisition (4)
- loading rate (4)
- locomotion (4)
- locus coeruleus (4)
- long-distance dispersal (4)
- low-back-pain (4)
- lower critical solution temperature (4)
- lutein (4)
- lutherische Theologie (4)
- macrocycles (4)
- magmatic-hydrothermal systems (4)
- magnetostriction (4)
- magnetotellurics (4)
- mammals (4)
- manifold with singularities (4)
- masculinity (4)
- mass (4)
- mathematics education (4)
- mathematics instruction (4)
- meadow (4)
- measurement invariance (4)
- mechanical tendinous oscillations (4)
- media education (4)
- media use (4)
- memory effects (4)
- mesenchymal stem cells (4)
- mesoporous materials (4)
- metabolite (4)
- metadata (4)
- meteorological drought (4)
- methyl orange (4)
- methylene blue (4)
- methylmercury (4)
- micro-CT (4)
- microRNA (4)
- microbiome (4)
- microlensing (4)
- mid-temperature transition (4)
- mild cognitive impairment (4)
- mitochondrial DNA (4)
- mitosis (4)
- mixtures (4)
- mobile links (4)
- modality compatibility (4)
- model-driven engineering (4)
- modular production (4)
- molecular phylogeny (4)
- molecules (4)
- molybdoenzyme (4)
- monoclonal antibody (4)
- mood (4)
- morality (4)
- morphogenesis (4)
- motivational interviewing (4)
- mowing (4)
- multi-level system (4)
- multilevel analysis (4)
- multiple stressors (4)
- multivariate statistics (4)
- muscle oxygen saturation (4)
- musculoskeletal and neural physiological phenomena (4)
- music information retrieval (4)
- musikpädagogische Forschung (4)
- nachhaltige Chemie (4)
- nanolenses (4)
- nanotriangles (4)
- narratives (4)
- national identity (4)
- naturalism (4)
- nature conservation (4)
- neoliberalism (4)
- nested graph conditions (4)
- network reconstruction (4)
- neurodegenerative diseases (4)
- neuroenhancement (4)
- neuronal networks (4)
- neuroscience (4)
- neutrinos (4)
- new technology (4)
- next generation sequencing (NGS) (4)
- nominalization (4)
- non-linear dynamics (4)
- non-native speakers (4)
- non-photorealistic rendering (4)
- nonlinear operator (4)
- noun (4)
- numerical (4)
- numerical model (4)
- numerische Kognition (4)
- ocean (4)
- ocean acidification (4)
- ocean color remote sensing (4)
- online discrimination (4)
- online learning (4)
- ontogeny (4)
- open data (4)
- open-circuit voltage (4)
- operating systems (4)
- optimal foraging (4)
- optimal transport (4)
- organ size (4)
- organic carbon (4)
- organische Chemie (4)
- organische Halbleiter (4)
- osmotic-pressure (4)
- osteoblast (4)
- other-race effect (4)
- outcomes (4)
- paleoaltimetry (4)
- paleoclimatology (4)
- paleogenomics (4)
- paleolimnology (4)
- parafoveal-on-foveal effect (4)
- part 1 (4)
- partial clone (4)
- partial least squares (4)
- particles (4)
- parties (4)
- pathway (4)
- patient education (4)
- peace (4)
- people (4)
- performance information (4)
- performance management (4)
- performance measurement (4)
- persulfide (4)
- phase dynamics (4)
- phase oscillators (4)
- phenols (4)
- phosphatidylserine (4)
- phospholipids (4)
- photoelectron (4)
- photofragmentation (4)
- photogrammetry (4)
- photoisomerization (4)
- photon density wave spectroscopy (4)
- photooxygenation (4)
- phototaxis (4)
- photovoltaic devices (4)
- physiological consequences (4)
- phytolith (4)
- picture-word interference (4)
- planetary rings (4)
- plant cell wall (4)
- plant development (4)
- plant growth (4)
- plant population and community dynamics (4)
- plasma-membrane (4)
- platelets (4)
- platform (4)
- playa (4)
- plume (4)
- pluvial flooding (4)
- pneumonia (4)
- point process (4)
- point-of-care (4)
- policy analysis (4)
- policy-making (4)
- political elites (4)
- political ideology (4)
- politische Eliten (4)
- poly(ethylene glycol) (4)
- polyadenylation (4)
- polyelectrolyte adsorption (4)
- polysemy (4)
- polysulfobetaine (4)
- population structure (4)
- poröse Materialien (4)
- potato (4)
- power spectral analysis (4)
- practice (4)
- pragmaticalisation (4)
- pre-school (4)
- preactivation (4)
- precision agriculture (4)
- precuneus (4)
- precursor (4)
- preference assessment (4)
- primary care (4)
- principal component analysis (4)
- privatization (4)
- proactive aggression (4)
- proactivity (4)
- probabilistic timed systems (4)
- problem-solving (4)
- process (4)
- process analytical technology (4)
- properties (4)
- protein engineering (4)
- proteinuria (4)
- proteome (4)
- psychological distress (4)
- psychosocial moderators (4)
- psychotherapeutic competencies (4)
- pubertal timing (4)
- public policy (4)
- qualitative Analyse (4)
- quantum gravity (4)
- quorum sensing (4)
- random walk (4)
- random walks (4)
- ranking (4)
- rape myth acceptance (4)
- rate of perceived exertion (4)
- rationalism (4)
- reactive aggression (4)
- reading fluency (4)
- reading motivation (4)
- real-time (4)
- receptor (4)
- recollection (4)
- recombinant inbred line (4)
- recurrence (4)
- recurrence analysis (4)
- recurrence plot (4)
- recurrence quantification analysis (4)
- redox (4)
- redox state (4)
- reference (4)
- referential choice (4)
- refinement (4)
- reforms (4)
- regime shift (4)
- region (4)
- regularity (4)
- relatedness (4)
- religiosity (4)
- remagnetization (4)
- reproductive strategies (4)
- requirements (4)
- research design (4)
- research school (4)
- resistin (4)
- resocialization (4)
- revolution (4)
- reward anticipation (4)
- rifting (4)
- risk perceptions (4)
- risk reduction (4)
- river incision (4)
- robustness (4)
- rolling averages (4)
- rotifer (4)
- run time analysis (4)
- runners (4)
- rural areas (4)
- saliva (4)
- salivary alpha-amylase (4)
- salt (4)
- salt pan (4)
- sanctions (4)
- sarcopenia (4)
- scaffolding (4)
- scenario analysis (4)
- school adjustment (4)
- school children (4)
- school mathematics (4)
- sea level (4)
- secondary school (4)
- security policy (4)
- sedimentology (4)
- segmentation (4)
- self-control (4)
- self-determination theory (4)
- self-objectification (4)
- self-regulated learning (4)
- self-sovereign identity (4)
- selfing syndrome (4)
- semantic (4)
- semi-parliamentarism (4)
- semiconductors (4)
- sensorimotor training (4)
- separation of powers (4)
- sequence (4)
- sexual assault (4)
- sexual coercion (4)
- sexual selection (4)
- sexual violence (4)
- sexuality (4)
- sexualization (4)
- shape (4)
- shape memory (4)
- shrub encroachment (4)
- sick leave (4)
- signal propagation (4)
- similarity measures (4)
- single nucleotide polymorphism (4)
- single-case experimental design (4)
- skill (4)
- skin (4)
- slumming (4)
- small mammals (4)
- smartphone (4)
- social movements (4)
- social network analysis (4)
- social participation (4)
- social status (4)
- sociality (4)
- sociology (4)
- soil hydrology (4)
- soil texture (4)
- soils (4)
- solute transport (4)
- sorbische Identität (4)
- soziale Ungleichheit (4)
- space use (4)
- spatial (4)
- spatially explicit model (4)
- special educational needs (4)
- species distribution model (4)
- species distribution modelling (4)
- specific language impairment (4)
- specific root length (4)
- speech segmentation (4)
- sport (4)
- stakeholder participation (4)
- star product (4)
- stars: black holes (4)
- stars: low-mass (4)
- stars: oscillations (4)
- starspots (4)
- start-up subsidies (4)
- states (4)
- statins (4)
- stellar physics (4)
- stellar winds (4)
- sterols (4)
- stochastic process (4)
- storage (4)
- strain (4)
- strain localization (4)
- stress memory (4)
- stress recovery (4)
- stress response (4)
- stress tolerance (4)
- subdiffusion (4)
- subjective well-being (4)
- subsidence (4)
- substance use (4)
- sucrose responsiveness (4)
- summer monsoon (4)
- supercapacitors (4)
- supergene (4)
- supernova remnants (4)
- superoxide dismutase (4)
- supervisor support (4)
- survey experiment (4)
- sustainable chemistry (4)
- symbiosis (4)
- systems theory (4)
- talent (4)
- tandem solar cells (4)
- tasks (4)
- tax system (4)
- taxation (4)
- teacher beliefs (4)
- teacher learning (4)
- teaching material (4)
- team sports (4)
- technology acceptance (4)
- temperament (4)
- territorial reforms (4)
- test (4)
- text mining (4)
- theoretische Chemie (4)
- thermal (4)
- thermodynamische Stabilität (4)
- thermokarst lakes (4)
- thiouracil (4)
- tocopherols (4)
- tourmaline (4)
- township tourism (4)
- trade (4)
- transatlantic relations (4)
- transcutaneous vagus nerve stimulation (4)
- travel literature (4)
- treatment (4)
- trustworthiness (4)
- tuition fees (4)
- type-III effector (4)
- ultrafast x-ray diffraction (4)
- ungulate (4)
- value creation (4)
- vascular plants (4)
- venom (4)
- verbs (4)
- vertical coupling (4)
- veterinary cordon fence (4)
- victim (4)
- virus infection (4)
- viscoelasticity (4)
- viscosity (4)
- visible-light (4)
- vocabulary (4)
- vocational education (4)
- voice (4)
- vowels (4)
- war (4)
- water fluxes (4)
- water security (4)
- water treatment (4)
- water-balance (4)
- water-soluble polymers (4)
- wave-particle interactions (4)
- wavelength (4)
- weak ergodicity breaking (4)
- weighted moving averages (4)
- welfare state (4)
- wettability (4)
- wetting (4)
- wh-movement (4)
- wildlife conservation (4)
- willingness to intervene (4)
- wind speed (4)
- wissenschaftliche Korrespondenz (4)
- wissenschaftliche Zeichnungen (4)
- working memory updating (4)
- yedoma (4)
- youth athletes (4)
- zebularine (4)
- zivil-militärische Beziehungen (4)
- Öffentliche Unternehmen (4)
- Öffentlicher Dienst (4)
- Übergewicht (4)
- Übersetzung (4)
- Überwachung (4)
- 'eta' invariant (3)
- 1845-1862 (3)
- 1970s (3)
- 2D (3)
- 2D perovskites (3)
- 2nd-language grammar (3)
- 3D Point Clouds (3)
- 3D city models (3)
- 3D geovisualization (3)
- 3D modeling (3)
- 4-nitrophenol (3)
- 5-methoxycarbonylmethyl-2-thiouridine (3)
- A-bar-movement (3)
- ABCB7 (3)
- AGN (3)
- AHP (3)
- AUD (3)
- Abandonment (3)
- Abbau (3)
- Abolitionismus (3)
- Abscisic acid (3)
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- Achilles and patellar tendon (3)
- Acid sphingomyelinase (3)
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- Acquisition (3)
- Action processing (3)
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- Adaptivität (3)
- Additive manufacturing (3)
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- Aerosole (3)
- AfD (3)
- Affective Computing (3)
- Affekt (3)
- African indigenous vegetables (3)
- Age (3)
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- Aktivität (3)
- Alborz (3)
- Aldehyde oxidase (3)
- Aldehyde oxidoreductase (3)
- Aleatory variability (3)
- Alkylpyridinium salts (3)
- Allgemeiner Teil (3)
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- App (3)
- Approximate Bayesian Computation (3)
- Arabica coffee beans (3)
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- Auxin transport (3)
- Avantgarde (3)
- Azobenzen (3)
- Azobenzene containing cationic surfactants (3)
- BEEHAVE (3)
- BIAT (3)
- BIM (3)
- BL Lacertae objects: individual: Mrk 421 (3)
- BL Lacertae objects: individual: PKS 2155-304 (3)
- Bacteriophage (3)
- Banken (3)
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- Barrierefreiheit (3)
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- Bolboschoenus maritimus (3)
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- Two forms of isometric muscle action (3)
- Type 1 diabetes (3)
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- degraded DNA (3)
- dehydration (3)
- delta-D values (3)
- democratisation (3)
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- diffraction (3)
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- effects (3)
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- elastic properties (3)
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- electrochemical impedance spectroscopy (3)
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- electron dynamics (3)
- electrophysiological evidence (3)
- elemental composition (3)
- elevated plus-maze (3)
- embedded systems (3)
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- emerging adults (3)
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- emotional exhaustion (3)
- emotional valence (3)
- employment services (3)
- encoding (3)
- end-stage kidney disease (3)
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- endozoochory (3)
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- episodic memory (3)
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- establishment (3)
- estimation (3)
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- evaporation (3)
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- fixation locations (3)
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- formal languages (3)
- formale Verifikation (3)
- formate dehydrogenase (3)
- formation damage (3)
- framework (3)
- frameworks (3)
- freedom restriction (3)
- fricative (3)
- functional (3)
- functional capacity (3)
- functional dependencies (3)
- functional dependency (3)
- functional near-infrared spectroscopy (3)
- fungal diversity (3)
- fuzzy logic (3)
- gait analysis (3)
- galaxies: individual: LMC (3)
- galaxies: magnetic fields (3)
- galaxy structure (3)
- gallbladder cancer (3)
- games (3)
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- garnet (3)
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- gels (3)
- gender equality (3)
- gender gap (3)
- gender inequality (3)
- gender wage gap (3)
- gene duplication (3)
- gene family (3)
- gene regulatory network (3)
- general (3)
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- generalization (3)
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- glass (3)
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- globalisation (3)
- globular clusters: individual: NGC 6397 (3)
- glucan (3)
- glucocorticoid receptor (3)
- glycaemic control (3)
- glycogen (3)
- glycosylation (3)
- goal frames (3)
- goblet cells (3)
- grade-skipping (3)
- gradient boosting (3)
- gradient flow (3)
- grain-size distribution (3)
- grammatical illusion (3)
- granite (3)
- granitoids (3)
- graph (3)
- graph constraints (3)
- graphite (3)
- graphomotor control (3)
- grassland (3)
- grasslands (3)
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- grouping (3)
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- heterogene Katalyse (3)
- heterogene Photokatalyse (3)
- heterogeneous photocatalysis (3)
- hierarchical clustering (3)
- high temperature (3)
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- hillslopes (3)
- hip (3)
- historical DNA (3)
- holography (3)
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- hostile attribution bias (3)
- hoverflies (3)
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- humanism (3)
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- hydrogen bonds (3)
- hydrogenation (3)
- hydrogeology (3)
- hydrological processes (3)
- hyperbolic tilings (3)
- hypersound (3)
- hyporheische Zone (3)
- hypothesis (3)
- iCheck (3)
- ice (3)
- ice sheet (3)
- image (3)
- image-based representation (3)
- imidazolium (3)
- impact assessment (3)
- impairment (3)
- impedance spectroscopy (3)
- implicit association test (IAT) (3)
- implicit learning (3)
- implizit (3)
- in silico (3)
- inbreeding depression (3)
- incentives (3)
- incision (3)
- income distribution (3)
- incremental graph pattern matching (3)
- index of elliptic operators in subspaces (3)
- indigene Völker (3)
- indirect facilitation (3)
- indirect tests (3)
- individual anaerobic threshold (3)
- individuelle Unterschiede (3)
- induced pluripotent stem cells (3)
- infant (3)
- inferences (3)
- infiltration (3)
- inflectional morphology (3)
- information and communication technologies (3)
- information integration (3)
- information technology (3)
- infrared: diffuse background (3)
- injection (3)
- injury prevention (3)
- inner magnetosphere (3)
- inorganic chemistry (3)
- input frequency (3)
- institutional interplay (3)
- instruction (3)
- instrumental variables (3)
- instrumentation (3)
- integrated personal income tax (3)
- intensification (3)
- intentional forgetting (3)
- interface engineering (3)
- interfacial recombination (3)
- interferometry (3)
- intergalaktisches Medium (3)
- interindividual differences (3)
- interleukin-8 (3)
- intermediate disturbance hypothesis (3)
- intermolecular interactions (3)
- internalization (3)
- international comparison (3)
- international humanitarian law (3)
- international migration (3)
- intervention locality (3)
- intervention study (3)
- interview study (3)
- intonation (3)
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- intracellular-transport (3)
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- intrinsically disordered proteins (3)
- intuition (3)
- invasion (3)
- inverse ill-posed problem (3)
- inverse micelles (3)
- inverse theory (3)
- ion exchange (3)
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- ionogel (3)
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- irrigation (3)
- islands (3)
- isokinetic (3)
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- isotopic tiling theory (3)
- iterative regularization (3)
- job creation (3)
- job demands-resources model (3)
- job search (3)
- junge Erwachsene (3)
- just transition (3)
- kana (3)
- kanji (3)
- keratinocytes (3)
- kernel density estimation (3)
- kettle hole (3)
- kinetic instabilities (3)
- kognitive Modellierung (3)
- kollektives Gedächtnis (3)
- komplexes Netzwerk (3)
- körperliche Fitness (3)
- l-cysteine desulfurase (3)
- labeling (3)
- labor supply (3)
- lactate threshold (3)
- lake monitoring (3)
- land cover change (3)
- land management (3)
- land-use (3)
- landing positions (3)
- landscape diversity (3)
- landscape homogenization (3)
- langevin equation (3)
- language attitudes (3)
- language courses (3)
- language proficiency (3)
- languages (3)
- larch (3)
- large-scale (3)
- last glacial period (3)
- late Holocene (3)
- late childhood (3)
- latent transition analysis (3)
- latitude (3)
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- lattice dynamics (3)
- leaf development (3)
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- leaking (3)
- learning and memory (3)
- learning factories (3)
- learning factory (3)
- learning styles (3)
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- legal history (3)
- legitimacy (3)
- legumes (3)
- lesson planning (3)
- lexical tone (3)
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- liberalism (3)
- life course (3)
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- lifetime (3)
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- limits (3)
- line: profiles (3)
- linear mixed model (3)
- linear programming (3)
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- linke Peripherie (3)
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- lipid (3)
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- literary criticism (3)
- literatures of the world (3)
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- load (3)
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- lower (3)
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- magnetotactic bacteria (3)
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- magnitude estimation (3)
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- major depression (3)
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- marine (3)
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- matching (3)
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- mechanotransduction (3)
- mediation (3)
- medicine (3)
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- memory and delay (3)
- mental imagery (3)
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- metagenome (3)
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- meteorology (3)
- methane hydrate (3)
- method (3)
- methodological quality (3)
- micelle (3)
- microbial community (3)
- microemulsion (3)
- microgel (3)
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- microstructures (3)
- microwave irradiation (3)
- migrants (3)
- military culture (3)
- military history (3)
- mindfulness (3)
- miniemulsion (3)
- minimal pairs (3)
- minimax convergence rates (3)
- mining lakes (3)
- minorities (3)
- missing-VP effect (3)
- mitochondrial dysfunction (3)
- mitogenome (3)
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- mittlere Kindheit (3)
- modal verbs (3)
- model coupling (3)
- model transformation (3)
- model uncertainty (3)
- model validation (3)
- modellgetriebene Entwicklung (3)
- modularity (3)
- molecular doping (3)
- molecular dynamics simulations (3)
- molecular motor (3)
- molybdenum (3)
- monetary incentive delay task (3)
- monoklonale Antikörper (3)
- monolayer (3)
- monomer (3)
- monomers (3)
- moral disengagement (3)
- morpho-orthography (3)
- morphological decomposition (3)
- morphological priming (3)
- morphological structure (3)
- morphometrics (3)
- morphosyntax (3)
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- motor resonance (3)
- motor skills (3)
- motor system (3)
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- multicultural policy (3)
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- multifunctional polymers (3)
- multilevel modelling (3)
- multiobjective calibration (3)
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- mutation (3)
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- navigation (3)
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- need satisfaction (3)
- needs (3)
- negative numbers (3)
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- neogene (3)
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- neural (3)
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- niche and fitness differences (3)
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- oligomerization (3)
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- online course (3)
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- open (3)
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- plausibility (3)
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- political science (3)
- political sociology (3)
- politische Bildung (3)
- politische Kultur (3)
- politische Philosophie (3)
- politische Ökonomie (3)
- poly(A) polymerase (3)
- poly(N-isopropylacrylamide) (3)
- poly(ether imide) (3)
- polyesters (3)
- polyglycerol (3)
- polymer solar cells (3)
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- population growth rate (3)
- positioning (3)
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- precaution (3)
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- predator-prey (3)
- predator-prey model (3)
- prediction models (3)
- preference (3)
- prefixes (3)
- preprocessing (3)
- preschool (3)
- pressures (3)
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- price of anarchy (3)
- primary metabolism (3)
- primary school children (3)
- printing (3)
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- probability (3)
- probability density function (3)
- probes (3)
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- prospective (3)
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- protein binding (3)
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- proteomic analysis (3)
- proteostasis (3)
- protonation (3)
- prototype-willingness-model (3)
- provenance (3)
- prozessorientierte Didaktik (3)
- pseudo-differential boundary value problems (3)
- pseudo-differential operators (3)
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- psychopathology (3)
- psychophysiology (3)
- psychopower (3)
- puberty (3)
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- publication bias (3)
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- pump-probe (3)
- punishment (3)
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- radical right (3)
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- regression tree (3)
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- relationships (3)
- relative clause (3)
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- relaxation (3)
- relevance (3)
- remission (3)
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- replacement (3)
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- research (3)
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- reservoir (3)
- residue (3)
- resocialisation (3)
- resolution (3)
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- resurrection plants (3)
- reveals (3)
- reward (3)
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- rhizosphere (3)
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- ring current (3)
- ring current electrons (3)
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- river (3)
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- robbery (3)
- rock (3)
- rodent (3)
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- rule of law (3)
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- rupture (3)
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- sample preparation (3)
- satellite data (3)
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- scalability (3)
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- school development (3)
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- seawater (3)
- second language acquisition (3)
- second language processing (3)
- secondary metabolites (3)
- secondary prevention (3)
- sedentary (3)
- sediment core (3)
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- seeds (3)
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- selective autophagy (3)
- selenoprotein P (3)
- self threat (3)
- self-assembled monolayer (3)
- self-assembled monolayers (3)
- self-organisation (3)
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- semantic priming (3)
- sensor data (3)
- sensorimotor control (3)
- sentence parsing (3)
- separation (3)
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- serum (3)
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- sexual self-esteem (3)
- shadow education (3)
- shallow structure hypothesis (3)
- shape-memory polymer (3)
- shoot apical meristem (3)
- short-read mapping (3)
- sibilant (3)
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- sign language (3)
- signalling (3)
- silver (3)
- similarity (3)
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- simulation model (3)
- simultaneous bilingualism (3)
- sin (3)
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- solubility (3)
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- sovereignty (3)
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- spatial turn (3)
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- speaking children (3)
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- starch synthase (3)
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- stars: individual (WR 6) (3)
- stars: pre-main sequence (3)
- statistical (3)
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- statistische Modelle (3)
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- stereoselectivity (3)
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- stoichiometry (3)
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- supervised machine learning (3)
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- syllables (3)
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- system analysis (3)
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- tablet (3)
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- talk-in-interaction (3)
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- task (3)
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- teleconnections (3)
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- thermobarometry (3)
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- theta (3)
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- thrombogenicity (3)
- time averaging (3)
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- timing (3)
- titania (3)
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- trace (3)
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- trait convergence and divergence (3)
- trait emotional intelligence (3)
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- trajectory data (3)
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- tropics (3)
- trunk muscle strength (3)
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- tunnel vision (3)
- twentieth century (3)
- type 2 (3)
- type specimens (3)
- ubiquitination (3)
- ultrafast X-ray diffraction (3)
- ultrafast molecular dynamics (3)
- ultraschnell (3)
- ultraviolet: galaxies (3)
- uncanny valley (3)
- unipolar affective disorders (3)
- universal quantifiers (3)
- university teaching (3)
- untargeted metabolomics (3)
- upper mantle (3)
- use (3)
- user interaction (3)
- user types (3)
- user-generated content (3)
- values (3)
- variance (3)
- varved lake sediments (3)
- varves (3)
- vascular calcification (3)
- vascularization (3)
- vegetables (3)
- vegetation dynamics (3)
- verb movement (3)
- violence in schools (3)
- virtualization (3)
- virtuelle Maschinen (3)
- virulence (3)
- visibility (3)
- visionary leadership (3)
- visual perception (3)
- visual search (3)
- visual world paradigm (3)
- visual-world paradigm (3)
- vitamin E (3)
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- ) (2)
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- 1 (2)
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Anomaly detection in process mining aims to recognize outlying or unexpected behavior in event logs for purposes such as the removal of noise and identification of conformance violations. Existing techniques for this task are primarily frequency-based, arguing that behavior is anomalous because it is uncommon. However, such techniques ignore the semantics of recorded events and, therefore, do not take the meaning of potential anomalies into consideration. In this work, we overcome this caveat and focus on the detection of anomalies from a semantic perspective, arguing that anomalies can be recognized when process behavior does not make sense. To achieve this, we propose an approach that exploits the natural language associated with events. Our key idea is to detect anomalous process behavior by identifying semantically inconsistent execution patterns. To detect such patterns, we first automatically extract business objects and actions from the textual labels of events. We then compare these against a process-independent knowledge base. By populating this knowledge base with patterns from various kinds of resources, our approach can be used in a range of contexts and domains. We demonstrate the capability of our approach to successfully detect semantic execution anomalies through an evaluation based on a set of real-world and synthetic event logs and show the complementary nature of semantics-based anomaly detection to existing frequency-based techniques.
Define real, Moron!
(2011)
Academic language should not be a ghetto dialect at odds with ordinary language, but rather an extension that is compatible with lay-language. To define ‘game’ with the unrealistic ambition of satisfying both lay-people and experts should not be a major concern for a game ontology, since the field it addresses is subject to cultural evolution and diachronic change. Instead of the impossible mission of turning the common word into an analytic concept, a useful task for an ontology of games is to model game differences, to show how the things we call games can be different from each other in a number of different ways.
The talk will focus on a few central problems in Game Studies: The question of where to locate game meaning, game defintions and how to avoid them, and the conundrum of games vs stories. In all these problems, the choice of ludic perspective (e.g. are games artifacts, systems or activities?) limits our ability to discuss games across disciplinary boundaries. What is needed is a metaperspective that will offer the field a chance to move on.
The sixth volume of the DIGAREC Series holds the contributions to the DIGAREC Keynote-Lectures given at the University of Potsdam in the winter semester 2009/10. With contributions by Mark J.P. Wolf (Concordia University Wisconsin), Espen Aarseth (Center for Computer Games Research, IT University of Copenhagen), Katie Salen (Parsons New School of Design, New York), Laura Ermi and Frans Mäyrä (University of Tampere), and Lev Manovich (University of Southern California, San Diego).
Reproducibility is a defining feature of science, but the extent to which it characterizes current research is unknown. We conducted replications of 100 experimental and correlational studies published in three psychology journals using high-powered designs and original materials when available. Replication effects were half the magnitude of original effects, representing a substantial decline. Ninety-seven percent of original studies had statistically significant results. Thirty-six percent of replications had statistically significant results; 47% of original effect sizes were in the 95% confidence interval of the replication effect size; 39% of effects were subjectively rated to have replicated the original result; and if no bias in original results is assumed, combining original and replication results left 68% with statistically significant effects. Correlational tests suggest that replication success was better predicted by the strength of original evidence than by characteristics of the original and replication teams.
Purpose: Coarticulatory effects in speech vary across development, but the sources of this variation remain unclear. This study investigated whether developmental differences in intrasyllabic coarticulation degree could be explained by differences in children's articulatory patterns compared to adults.
Method: To address this question, we first compared the tongue configurations of 3-to 7-year-old German children to those of adults. The observed developmental differences were then examined through simulations with Task Dynamics Application, a Task Dynamics simulation system, to establish which articulatory modifications could best reproduce the empirical results. To generate syllables simulating the lack of tongue gesture differentiation, we tested three simulation scenarios.
Results: We found that younger speakers use less differentiated articulatory patterns to achieve alveolar constrictions than adults. The simulations corresponding to undifferentiated control of tongue tip and tongue body resulted in (a) tongue shapes similar to those observed in natural speech and (b) higher degrees of intrasyllabic coarticulation in children when compared to adults.
Conclusions: Results provide evidence that differences in articulatory patterns contribute to developmental differences in coarticulation degree. This study further shows that empirically informed modeling can advance our understanding of changes in coarticulatory patterns across age.
In previous research, mutual information (MI) was employed to quantify the physical information shared between consecutive phonological segments, based on electromagnetic articulography data. In this study, MI is extended to quantifying coarticulatory resistance (CR) versus overlap in German using ultrasound imaging. Two measurements are tested as input to MI: (1) the highest point on the tongue body and (2) the first coefficient of the discrete Fourier transform (DFT) of the whole tongue contour. Both measures are used to examine changes in coarticulation between two time points during the syllable span: the consonant midpoint and the vowel onset. Results corroborate previous findings reporting differences in coarticulatory overlap in German and across languages. Further, results suggest that MI used with the highest point on the tongue body captures distinctions related both to place and manner of articulation, while the first DFT coefficient does not provide any additional information regarding global (whole tongue) as opposed to local (individual articulator) aspects of CR. However, both methods capture temporal distinctions in coarticulatory resistance between the two time points. Results are discussed with respect to the potential of MI measure to provide a way of unifying coarticulation quantification methods across data collection techniques.
Hepcidin-25 was identified as themain iron regulator in the human body, and it by binds to the sole iron-exporter ferroportin. Studies showed that the N-terminus of hepcidin is responsible for this interaction, the same N-terminus that encompasses a small copper(II) binding site known as the ATCUN (amino-terminal Cu(II)- and Ni(II)-binding) motif. Interestingly, this copper-binding property is largely ignored in most papers dealing with hepcidin-25. In this context, detailed investigations of the complex formed between hepcidin-25 and copper could reveal insight into its biological role. The present work focuses on metal-bound hepcidin-25 that can be considered the biologically active form. The first part is devoted to the reversed-phase chromatographic separation of copper-bound and copper-free hepcidin-25 achieved by applying basic mobile phases containing 0.1% ammonia. Further, mass spectrometry (tandemmass spectrometry (MS/MS), high-resolutionmass spectrometry (HRMS)) and nuclear magnetic resonance (NMR) spectroscopy were employed to characterize the copper-peptide. Lastly, a three-dimensional (3D)model of hepcidin-25with bound copper(II) is presented. The identification of metal complexes and potential isoforms and isomers, from which the latter usually are left undetected by mass spectrometry, led to the conclusion that complementary analytical methods are needed to characterize a peptide calibrant or referencematerial comprehensively. Quantitative nuclear magnetic resonance (qNMR), inductively-coupled plasma mass spectrometry (ICP-MS), ion-mobility spectrometry (IMS) and chiral amino acid analysis (AAA) should be considered among others.
Hepcidin-25 was identified as themain iron regulator in the human body, and it by binds to the sole iron-exporter ferroportin. Studies showed that the N-terminus of hepcidin is responsible for this interaction, the same N-terminus that encompasses a small copper(II) binding site known as the ATCUN (amino-terminal Cu(II)- and Ni(II)-binding) motif. Interestingly, this copper-binding property is largely ignored in most papers dealing with hepcidin-25. In this context, detailed investigations of the complex formed between hepcidin-25 and copper could reveal insight into its biological role. The present work focuses on metal-bound hepcidin-25 that can be considered the biologically active form. The first part is devoted to the reversed-phase chromatographic separation of copper-bound and copper-free hepcidin-25 achieved by applying basic mobile phases containing 0.1% ammonia. Further, mass spectrometry (tandemmass spectrometry (MS/MS), high-resolutionmass spectrometry (HRMS)) and nuclear magnetic resonance (NMR) spectroscopy were employed to characterize the copper-peptide. Lastly, a three-dimensional (3D)model of hepcidin-25with bound copper(II) is presented. The identification of metal complexes and potential isoforms and isomers, from which the latter usually are left undetected by mass spectrometry, led to the conclusion that complementary analytical methods are needed to characterize a peptide calibrant or referencematerial comprehensively. Quantitative nuclear magnetic resonance (qNMR), inductively-coupled plasma mass spectrometry (ICP-MS), ion-mobility spectrometry (IMS) and chiral amino acid analysis (AAA) should be considered among others.
Advances in characteristics improvement of polymeric membranes/separators for zinc-air batteries
(2022)
Zinc-air batteries (ZABs) are gaining popularity for a wide range of applications due to their high energy density, excellent safety, and environmental friendliness. A membrane/separator is a critical component of ZABs, with substantial implications for battery performance and stability, particularly in the case of a battery in solid state format, which has captured increased attention in recent years. In this review, recent advances as well as insight into the architecture of polymeric membrane/separators for ZABs including porous polymer separators (PPSs), gel polymer electrolytes (GPEs), solid polymer electrolytes (SPEs) and anion exchange membranes (AEMs) are discussed. The paper puts forward strategies to enhance stability, ionic conductivity, ionic selectivity, electrolyte storage capacity and mechanical properties for each type of polymeric membrane. In addition, the remaining major obstacles as well as the most potential avenues for future research are examined in detail.
An exploration of rhythmic grouping of speech sequences by french- and german-learning infants
(2016)
Rhythm in music and speech can be characterized by a constellation of several acoustic cues. Individually, these cues have different effects on rhythmic perception: sequences of sounds alternating in duration are perceived as short-long pairs (weak-strong/iambicpattern), whereas sequences of sounds alternating in intensity or pitch are perceived as loud-soft, or high-low pairs (strong-weak/trochaic pattern). This perceptual bias-called the lambic-Trochaic Law (ITL) has been claimed to be an universal property of the auditory system applying in both the music and the language domains. Recent studies have shown that language experience can modulate the effects of the ITL on rhythmic perception of both speech and non-speech sequences in adults, and of non-speech sequences in 7.5-month-old infants. The goal of the present study was to explore whether language experience also modulates infants' grouping of speech. To do so, we presented sequences of syllables to monolingual French- and German-learning 7.5-month-olds. Using the Headturn Preference Procedure (HPP), we examined whether they were able to perceive a rhythmic structure in sequences of syllables that alternated in duration, pitch, or intensity. Our findings show that both French- and German-learning infants perceived a rhythmic structure when it was cued by duration or pitch but not intensity. Our findings also show differences in how these infants use duration and pitch cues to group syllable sequences, suggesting that pitch cues were the easier ones to use. Moreover, performance did not differ across languages, failing to reveal early language effects on rhythmic perception. These results contribute to our understanding of the origin of rhythmic perception and perceptual mechanisms shared across music and speech, which may bootstrap language acquisition.
An Exploration of Rhythmic Grouping of Speech Sequences by French- and German-Learning Infants
(2016)
Rhythm in music and speech can be characterized by a constellation of several acoustic cues. Individually, these cues have different effects on rhythmic perception: sequences of sounds alternating in duration are perceived as short-long pairs (weak-strong/iambic pattern), whereas sequences of sounds alternating in intensity or pitch are perceived as loud-soft, or high-low pairs (strong-weak/trochaic pattern). This perceptual bias—called the Iambic-Trochaic Law (ITL)–has been claimed to be an universal property of the auditory system applying in both the music and the language domains. Recent studies have shown that language experience can modulate the effects of the ITL on rhythmic perception of both speech and non-speech sequences in adults, and of non-speech sequences in 7.5-month-old infants. The goal of the present study was to explore whether language experience also modulates infants’ grouping of speech. To do so, we presented sequences of syllables to monolingual French- and German-learning 7.5-month-olds. Using the Headturn Preference Procedure (HPP), we examined whether they were able to perceive a rhythmic structure in sequences of syllables that alternated in duration, pitch, or intensity. Our findings show that both French- and German-learning infants perceived a rhythmic structure when it was cued by duration or pitch but not intensity. Our findings also show differences in how these infants use duration and pitch cues to group syllable sequences, suggesting that pitch cues were the easier ones to use. Moreover, performance did not differ across languages, failing to reveal early language effects on rhythmic perception. These results contribute to our understanding of the origin of rhythmic perception and perceptual mechanisms shared across music and speech, which may bootstrap language acquisition.
A new approach to achieve sub-pixel spatial resolution in a pnCCD detector with 75 x 75 mu m(2) pixel size is proposed for X-ray applications in single photon counting mode. The approach considers the energy dependence of the charge cloud created by a single photon and its split probabilities between neighboring pixels of the detector based on a rectangular model for the charge cloud density. For cases where the charge of this cloud becomes distributed over three or four pixels the center position of photon impact can be reconstructed with a precision better than 2 mu m. The predicted charge cloud sizes are tested at selected X-ray fluorescence lines emitting energies between 6.4 keV and 17.4 keV and forming charge clouds with size (rms) varying between 8 mu m and 10 mu m respectively. The 2 mu m enhanced spatial resolution of the pnCCD is verified by means of an x-ray transmission experiment throughout an optical grating.
Studying the temporal variability of BL Lac objects at the highest energies provides unique insights into the extreme physical processes occurring in relativistic jets and in the vicinity of super-massive black holes. To this end, the long-term variability of the BL Lac object PKS 2155 304 is analyzed in the high (HE, 100MeV < E < 300 GeV) and very high energy (VHE, E > 200 GeV) gamma-ray domain. Over the course of similar to 9 yr of H. E. S. S. observations the VHE light curve in the quiescent state is consistent with a log-normal behavior. The VHE variability in this state is well described by flicker noise (power-spectral-density index beta(VHE) = 1 .10(+ 0 : 10) (0 : 13)) on timescales larger than one day. An analysis of similar to 5.5 yr of HE Fermi-LAT data gives consistent results (beta(HE) = 1 : 20(+ 0 : 21) (0 : 23), on timescales larger than 10 days) compatible with the VHE findings. The HE and VHE power spectral densities show a scale invariance across the probed time ranges. A direct linear correlation between the VHE and HE fluxes could neither be excluded nor firmly established. These long-term-variability properties are discussed and compared to the red noise behavior (beta similar to 2) seen on shorter timescales during VHE-flaring states. The difference in power spectral noise behavior at VHE energies during quiescent and flaring states provides evidence that these states are influenced by different physical processes, while the compatibility of the HE and VHE long-term results is suggestive of a common physical link as it might be introduced by an underlying jet-disk connection.
The unidentified very-high-energy (VHE; E > 0.1 TeV) gamma -ray source, HESS J1826-130, was discovered with the High Energy Stereoscopic System (HESS) in the Galactic plane. The analysis of 215 h of HESS data has revealed a steady gamma -ray flux from HESS J1826-130, which appears extended with a half-width of 0.21 degrees +/- 0.02 <br /> (stat)degrees <br /> stat degrees +/- 0.05 <br /> (sys)degrees sys degrees . The source spectrum is best fit with either a power-law function with a spectral index Gamma = 1.78 +/- 0.10(stat) +/- 0.20(sys) and an exponential cut-off at 15.2 <br /> (+5.5)(-3.2) -3.2+5.5 TeV, or a broken power-law with Gamma (1) = 1.96 +/- 0.06(stat) +/- 0.20(sys), Gamma (2) = 3.59 +/- 0.69(stat) +/- 0.20(sys) for energies below and above E-br = 11.2 +/- 2.7 TeV, respectively. The VHE flux from HESS J1826-130 is contaminated by the extended emission of the bright, nearby pulsar wind nebula, HESS J1825-137, particularly at the low end of the energy spectrum. Leptonic scenarios for the origin of HESS J1826-130 VHE emission related to PSR J1826-1256 are confronted by our spectral and morphological analysis. In a hadronic framework, taking into account the properties of dense gas regions surrounding HESS J1826-130, the source spectrum would imply an astrophysical object capable of accelerating the parent particle population up to greater than or similar to 200 TeV. Our results are also discussed in a multiwavelength context, accounting for both the presence of nearby supernova remnants, molecular clouds, and counterparts detected in radio, X-rays, and TeV energies.
A search for new supernova remnants (SNRs) has been conducted using TeV gamma-ray data from the H.E.S.S. Galactic plane survey. As an identification criterion, shell morphologies that are characteristic for known resolved TeV SNRs have been used. Three new SNR candidates were identified in the H.E.S.S. data set with this method. Extensive multiwavelength searches for counterparts were conducted. A radio SNR candidate has been identified to be a counterpart to HESS J1534-571. The TeV source is therefore classified as a SNR. For the other two sources, HESS J1614-518 and HESS J1912 + 101, no identifying counterparts have been found, thus they remain SNR candidates for the time being. TeV-emitting SNRs are key objects in the context of identifying the accelerators of Galactic cosmic rays. The TeV emission of the relativistic particles in the new sources is examined in view of possible leptonic and hadronic emission scenarios, taking the current multiwavelength knowledge into account.
The diffuse very high-energy (VHE; > 100 GeV) gamma-ray emission observed in the central 200 pc of the Milky Way by H.E.S.S. was found to follow dense matter distribution in the central molecular zone (CMZ) up to a longitudinal distance of about 130 pc to the Galactic centre (GC), where the flux rapidly decreases. This was initially interpreted as the result of a burst-like injection of energetic particles 104 yr ago, but a recent more sensitive H.E.S.S. analysis revealed that the cosmic-ray (CR) density profile drops with the distance to the centre, making data compatible with a steady cosmic PeVatron at the GC. In this paper, we extend this analysis to obtain, for the first time, a detailed characterisation of the correlation with matter and to search for additional features and individual gamma-ray sources in the inner 200 pc. Taking advantage of 250 h of H.E.S.S. data and improved analysis techniques, we perform a detailed morphology study of the diffuse VHE emission observed from the GC ridge and reconstruct its total spectrum. To test the various contributions to the total gamma-ray emission, we used an iterative 2D maximum-likelihood approach that allows us to build a phenomenological model of the emission by summing a number of different spatial components. We show that the emission correlated with dense matter covers the full CMZ and that its flux is about half the total diffuse emission flux. We also detect some emission at higher latitude that is likely produced by hadronic collisions of CRs in less dense regions of the GC interstellar medium. We detect an additional emission component centred on the GC and extending over about 15 pc that is consistent with the existence of a strong CR density gradient and confirms the presence of a CR accelerator at the very centre of our Galaxy. We show that the spectrum of full ridge diffuse emission is compatible with that previously derived from the central regions, suggesting that a single population of particles fills the entire CMZ. Finally, we report the discovery of a VHE gamma-ray source near the GC radio arc and argue that it is produced by the pulsar wind nebula candidate G0.13-0.11.
Aims. We study gamma-ray emission from the shell-type supernova remnant (SNR) RXJ0852.0-4622 to better characterize its spectral properties and its distribution over the SNR. Methods. The analysis of an extended High Energy Spectroscopic System (H.E.S.S.) data set at very high energies (E > 100 GeV) permits detailed studies, as well as spatially resolved spectroscopy, of the morphology and spectrum of the whole RXJ0852.0-4622 region. The H.E.S.S. data are combined with archival data from other wavebands and interpreted in the framework of leptonic and hadronic models. The joint Fermi-LAT-H.E.S.S. spectrum allows the direct determination of the spectral characteristics of the parent particle population in leptonic and hadronic scenarios using only GeV-TeV data. Results. An updated analysis of the H.E.S.S. data shows that the spectrum of the entire SNR connects smoothly to the high-energy spectrum measured by Fermi-LAT. The increased data set makes it possible to demonstrate that the H.E.S.S. spectrum deviates significantly from a power law and is well described by both a curved power law and a power law with an exponential cutoff at an energy of E-cut = (6.7 +/- 1.2(stat) +/- 1.2(syst)) TeV. The joint Fermi-LAT-H.E.S.S. spectrum allows the unambiguous identification of the spectral shape as a power law with an exponential cutoff. No significant evidence is found for a variation of the spectral parameters across the SNR, suggesting similar conditions of particle acceleration across the remnant. A simple modeling using one particle population to model the SNR emission demonstrates that both leptonic and hadronic emission scenarios remain plausible. It is also shown that at least a part of the shell emission is likely due to the presence of a pulsar wind nebula around PSR J0855-4644.
Context. Runaway stars form bow shocks by ploughing through the interstellar medium at supersonic speeds and are promising sources of non-thermal emission of photons. One of these objects has been found to emit non-thermal radiation in the radio band. This triggered the development of theoretical models predicting non-thermal photons from radio up to very-high-energy (VHE, E >= 0.1 TeV) gamma rays. Subsequently, one bow shock was also detected in X-ray observations. However, the data did not allow discrimination between a hot thermal and a non-thermal origin. Further observations of different candidates at X-ray energies showed no evidence for emission at the position of the bow shocks either. A systematic search in the Fermi-LAT energy regime resulted in flux upper limits for 27 candidates listed in the E-BOSS catalogue. Aims. Here we perform the first systematic search for VHE gamma-ray emission from bow shocks of runaway stars. Methods. Using all available archival H.E.S.S. data we search for very-high-energy gamma-ray emission at the positions of bow shock candidates listed in the second E-BOSS catalogue release. Out of the 73 bow shock candidates in this catalogue, 32 have been observed with H.E.S.S. Results. None of the observed 32 bow shock candidates in this population study show significant emission in the H.E.S.S. energy range. Therefore, flux upper limits are calculated in five energy bins and the fraction of the kinetic wind power that is converted into VHE gamma rays is constrained. Conclusions. Emission from stellar bow shocks is not detected in the energy range between 0.14 and 18 TeV. The resulting upper limits constrain the level of VHE gamma-ray emission from these objects down to 0.1-1% of the kinetic wind energy.
The nine-year H.E.S.S. Galactic Plane Survey (HGPS) has yielded the most uniform observation scan of the inner Milky Way in the TeV gamma-ray band to date. The sky maps and source catalogue of the HGPS allow for a systematic study of the population of TeV pulsar wind nebulae found throughout the last decade. To investigate the nature and evolution of pulsar wind nebulae, for the first time we also present several upper limits for regions around pulsars without a detected TeV wind nebula. Our data exhibit a correlation of TeV surface brightness with pulsar spindown power (E) over dot. This seems to be caused both by an increase of extension with decreasing (E) over dot, and hence with time, compatible with a power law R-PWN((E) over dot) similar to(E) over dot(0.65 +/- 0.20), and by a mild decrease of TeV gamma-ray luminosity with decreasing (E) over dot, compatible with L-1 (10 TeV) similar to (E) over dot(0.59 +/- 0.21). We also find that the off sets of pulsars with respect to the wind nebula centre with ages around 10 kyr are frequently larger than can be plausibly explained by pulsar proper motion and could be due to an asymmetric environment. In the present data, it seems that a large pulsar off set is correlated with a high apparent TeV efficiency L1- 10 TeV / (E) over dot. In addition to 14 HGPS sources considered firmly identified pulsar wind nebulae and 5 additional pulsar wind nebulae taken from literature, we find 10 HGPS sources that are likely TeV pulsar wind nebula candidates. Using a model that subsumes the present common understanding of the very high-energy radiative evolution of pulsar wind nebulae, we find that the trends and variations of the TeV observables and limits can be reproduced to a good level, drawing a consistent picture of present-day TeV data and theory.
The supernova remnant (SNR) W49B originated from a core-collapse supernova that occurred between one and four thousand years ago, and subsequently evolved into a mixed-morphology remnant, which is interacting with molecular clouds (MC). Gamma-ray observations of SNR-MC associations are a powerful tool to constrain the origin of Galactic cosmic rays, as they can probe the acceleration of hadrons through their interaction with the surrounding medium and subsequent emission of non-thermal photons. We report the detection of a gamma-ray source coincident with W49B at very high energies (VHE; E > 100 GeV) with the H.E.S.S. Cherenkov telescopes together with a study of the source with five years of Fermi-LAT high-energy gamma-ray (0.06-300 GeV) data. The smoothly connected, combined source spectrum, measured from 60 MeV to multi-TeV energies, shows two significant spectral breaks at 304 +/- 20 MeV and 8.4(-2.5)(+2.5) GeV; the latter is constrained by the joint fit from the two instruments. The detected spectral features are similar to those observed in several other SNR-MC associations and are found to be indicative of gamma-ray emission produced through neutral-pion decay.
PKS 0625-354 (z = 0.055) was observed with the four High Energy Stereoscopic System (H.E.S.S.) telescopes in 2012 during 5.5 h. The source was detected above an energy threshold of 200 GeV at a significance level of 6.1 sigma. No significant variability is found in these observations. The source is well described with a power-law spectrum with photon index Gamma = 2.84 +/- 0.50(stat) +/- 0.10(syst) and normalization (at E-0 = 1.0 TeV) N-0(E-0)=(0.58 +/- 0.22(stat) +/- 0.12(syst)) x 10(-12) TeV-1 cm(-2) s(-1). Multiwavelength data collected with Fermi-LAT, Swift-XRT, Swift-UVOT, ATOM and WISE are also analysed. Significant variability is observed only in the Fermi-LAT gamma-ray and Swift-XRT X-ray energy bands. Having a good multiwavelength coverage from radio to very high energy, we performed a broad-band modelling from two types of emission scenarios. The results from a one zone lepto-hadronic and a multizone leptonic models are compared and discussed. On the grounds of energetics, our analysis favours a leptonic multizone model. Models associated to the X-ray variability constraint support previous results, suggesting a BL Lac nature of PKS 0625-354 with, however, a large-scale jet structure typical of a radio galaxy.
Context. Microquasars are potential gamma-ray emitters. Indications of transient episodes of gamma-ray emission were recently reported in at least two systems: Cyg X-1 and Cyg X-3. The identification of additional gamma-ray-emitting microquasars is required to better understand how gamma-ray emission can be produced in these systems. Aims. Theoretical models have predicted very high-energy (VHE) gamma-ray emission from microquasars during periods of transient outburst. Observations reported herein were undertaken with the objective of observing a broadband flaring event in the gamma-ray and X-ray bands. Methods. Contemporaneous observations of three microquasars, GRS 1915+105, Circinus X-1, and V4641 Sgr, were obtained using the High Energy Spectroscopic System (H.E.S.S.) telescope array and the Rossi X-ray Timing Explorer (RXTE) satellite. X-ray analyses for each microquasar were performed and VHE gamma-ray upper limits from contemporaneous H.E.S.S. observations were derived. Results. No significant gamma-ray signal has been detected in any of the three systems. The integral gamma-ray photon flux at the observational epochs is constrained to be I(>560 GeV) < 7.3 x 10(-13) cm(-2) S-1, I(>560 GeV) < 1.2 x 10-(12) cm s(-1), and I(>240 GeV) < 4.5 x 10(-12) cm(-2) s(-1) for GRS 1915+105, Circinus X-1, and V4641 Sgr, respectively. Conclusions. The gamma-ray upper limits obtained using H.E.S.S. are examined in the context of previous Cherenkov telescope observations of microquasars. The effect of intrinsic absorption is modelled for each target and found to have negligible impact on the flux of escaping gamma-rays. When combined with the X-ray behaviour observed using RXTE, the derived results indicate that if detectable VHE gamma-ray emission from microquasars is commonplace, then it is likely to be highly transient.
Extended VHE gamma-ray emission towards SGR1806-20, LBV 1806-20, and stellar cluster Cl*1806-20
(2018)
Using the High Energy Spectroscopic System (H.E.S.S.) telescopes we have discovered a steady and extended very high-energy (VHE) gamma-ray source towards the luminous blue variable candidate LBV 1806-20, massive stellar cluster Cl* 1806-20, and magnetar SGR 1806-20. The new VHE source, HESS J1808-204, was detected at a statistical significance of >6 sigma (post-trial) with a photon flux normalisation (2.9 +/- 0.4(stat) +/- 0.5(sys)) x 10(-13) ph cm(-2) s(-1) TeV-1 at 1 TeV and a power-law photon index of 2.3 +/- 0.2(stat) +/- 0.3(sys). The luminosity of this source (0.2 to 10 TeV; scaled to distance d = 8 : 7 kpc) is L-VHE similar to 1.6 x 10(34)(d = 8.7 kpc)(2) erg s(-1). The VHE gamma-ray emission is extended and is well fit by a single Gaussian with statistical standard deviation of 0.095 degrees +/- 0.015 degrees. This extension is similar to that of the synchrotron radio nebula G10.0-0.3, which is thought to be powered by LBV 1806-20. The VHE gamma-ray luminosity could be provided by the stellar wind luminosity of LBV 1806-20 by itself and/or the massive star members of Cl* 1806-20. Alternatively, magnetic dissipation (e.g. via reconnection) from SGR 1806-20 can potentially account for the VHE luminosity. The origin and hadronic and/or leptonic nature of the accelerated particles responsible for HESS J1808-204 is not yet clear. If associated with SGR 1806 20, the potentially young age of the magnetar (650 yr) can be used to infer the transport limits of these particles to match the VHE source size. This discovery provides new interest in the potential for high-energy particle acceleration from magnetars, massive stars, and/or stellar clusters.
Shell-type supernova remnants (SNRs) are considered prime candidates for the acceleration of Galactic cosmic rays (CRs) up to the knee of the CR spectrum at E approximate to 3 x 10(15) eV. Our MilkyWay galaxy hosts more than 350 SNRs discovered at radio wavelengths and at high energies, of which 220 fall into the H.E.S.S. Galactic Plane Survey (HGPS) region. Of those, only 50 SNRs are coincident with a H.E.S.S source and in 8 cases the very high-energy (VHE) emission is firmly identified as an SNR. The H.E.S.S. GPS provides us with a legacy for SNR population study in VHE gamma-rays and we use this rich data set to extract VHE flux upper limits from all undetected SNRs. Overall, the derived flux upper limits are not in contradiction with the canonical CR paradigm. Assuming this paradigm holds true, we can constrain typical ambient density values around shell-type SNRs to n <= 7 cm(-3) and electron-to-proton energy fractions above 10 TeV to epsilon(ep) <= 5 x 10(-3). Furthermore, comparisons of VHE with radio luminosities in non-interacting SNRs reveal a behaviour that is in agreement with the theory of magnetic field amplification at shell-type SNRs.
We present the results of the most comprehensive survey of the Galactic plane in very high-energy (VHE) gamma-rays, including a public release of Galactic sky maps, a catalog of VHE sources, and the discovery of 16 new sources of VHE gamma-rays. The High Energy Spectroscopic System (H.E.S.S.) Galactic plane survey (HGPS) was a decade-long observation program carried out by the H.E.S.S. I array of Cherenkov telescopes in Namibia from 2004 to 2013. The observations amount to nearly 2700 h of quality-selected data, covering the Galactic plane at longitudes from l = 250 degrees to 65 degrees and latitudes vertical bar b vertical bar <= 3 degrees. In addition to the unprecedented spatial coverage, the HGPS also features a relatively high angular resolution (0.08 degrees approximate to 5 arcmin mean point spread function 68% containment radius), sensitivity (less than or similar to 1.5% Crab flux for point-like sources), and energy range (0.2-100 TeV). We constructed a catalog of VHE gamma-ray sources from the HGPS data set with a systematic procedure for both source detection and characterization of morphology and spectrum. We present this likelihood-based method in detail, including the introduction of a model component to account for unresolved, large-scale emission along the Galactic plane. In total, the resulting HGPS catalog contains 78 VHE sources, of which 14 are not reanalyzed here, for example, due to their complex morphology, namely shell-like sources and the Galactic center region. Where possible, we provide a firm identification of the VHE source or plausible associations with sources in other astronomical catalogs. We also studied the characteristics of the VHE sources with source parameter distributions. 16 new sources were previously unknown or unpublished, and we individually discuss their identifications or possible associations. We firmly identified 31 sources as pulsar wind nebulae (PWNe), supernova remnants (SNRs), composite SNRs, or gamma-ray binaries. Among the 47 sources not yet identified, most of them (36) have possible associations with cataloged objects, notably PWNe and energetic pulsars that could power VHE PWNe.
The H.E.S.S. Collaboration has discovered a new very high energy (VHE, E > 0.1 TeV) gamma-ray source, HESS J1741-302, located in the Galactic plane. Despite several attempts to constrain its nature, no plausible counterpart has been found so far at X-ray and MeV/GeV gamma-ray energies, and the source remains unidentified. An analysis of 145-h of observations of HESS J1741-302 at VHEs has revealed a steady and relatively weak TeV source (similar to 1% of the Crab Nebula flux), with a spectral index of Gamma = 2.3 +/- 0.2(stat) +/- 0.2(sys), extending to energies up to 10 TeV without any clear signature of a cut-off. In a hadronic scenario, such a spectrum implies an object with particle acceleration up to energies of several hundred TeV. Contrary to most H.E.S.S. unidentified sources, the angular size of HESS J1741-302 is compatible with the H.E.S.S. point spread function at VHEs, with an extension constrained to be below 0.068 degrees at a 99% confidence level. The gamma-ray emission detected by H.E.S.S. can be explained both within a hadronic scenario, due to collisions of protons with energies of hundreds of TeV with dense molecular clouds, and in a leptonic scenario, as a relic pulsar wind nebula, possibly powered by the middle-aged (20 kyr) pulsar PSR B1737-30. A binary scenario, related to the compact radio source 1LC 358.266+0.038 found to be spatially coincident with the best fit position of HESS J1741-302, is also envisaged.
Centaurus A (Cen A) is the nearest radio galaxy discovered as a very-high-energy (VHE; 100 GeV-100 TeV) gamma-ray source by the High Energy Stereoscopic System (H.E.S.S.). It is a faint VHE gamma-ray emitter, though its VHE flux exceeds both the extrapolation from early Fermi-LAT observations as well as expectations from a (misaligned) single-zone synchrotron-self Compton (SSC) description. The latter satisfactorily reproduces the emission from Cen A at lower energies up to a few GeV. New observations with H.E.S.S., comparable in exposure time to those previously reported, were performed and eight years of Fermi-LAT data were accumulated to clarify the spectral characteristics of the gamma-ray emission from the core of Cen A. The results allow us for the first time to achieve the goal of constructing a representative, contemporaneous gamma-ray core spectrum of Cen A over almost five orders of magnitude in energy. Advanced analysis methods, including the template fitting method, allow detection in the VHE range of the core with a statistical significance of 12 sigma on the basis of 213 hours of total exposure time. The spectrum in the energy range of 250 GeV-6 TeV is compatible with a power-law function with a photon index Gamma = 2.52 +/- 0.13(stat) +/- 0.20(sys). An updated Fermi-LAT analysis provides evidence for spectral hardening by Delta Gamma similar or equal to 0.4 +/- 0.1 at gamma-ray energies above 2.8(-0.6)(+1.0) GeV at a level of 4.0 sigma. The fact that the spectrum hardens at GeV energies and extends into the VHE regime disfavour a single-zone SSC interpretation for the overall spectral energy distribution (SED) of the core and is suggestive of a new gamma-ray emitting component connecting the high-energy emission above the break energy to the one observed at VHE energies. The absence of significant variability at both GeV and TeV energies does not yet allow disentanglement of the physical nature of this component, though a jet-related origin is possible and a simple two-zone SED model fit is provided to this end.
Spectral lines are among the most powerful signatures for dark matter (DM) annihilation searches in very-high-energy gamma rays. The central region of the Milky Way halo is one of the most promising targets given its large amount of DM and proximity to Earth. We report on a search for a monoenergetic spectral line from self-annihilations of DM particles in the energy range from 300 GeV to 70 TeV using a two-dimensional maximum likelihood method taking advantage of both the spectral and spatial features of the signal versus background. The analysis makes use of Galactic center observations accumulated over ten years (2004-2014) with the H.E.S.S. array of ground-based Cherenkov telescopes. No significant gamma-ray excess above the background is found. We derive upper limits on the annihilation cross section (sigma v) for monoenergetic DM lines at the level of 4 x 10(-28) cm(3) s(-1) at 1 TeV, assuming an Einasto DM profile for the Milky Way halo. For a DM mass of 1 TeV, they improve over the previous ones by a factor of 6. The present constraints are the strongest obtained so far for DM particles in the mass range 300 GeV-70 TeV. Ground-based gamma-ray observations have reached sufficient sensitivity to explore relevant velocity-averaged cross sections for DM annihilation into two gamma-ray photons at the level expected from the thermal relic density for TeV DM particles.
Measurement of the EBL spectral energy distribution using the VHE gamma-ray spectra of HESS blazars
(2017)
Very high-energy gamma rays (VHE, E greater than or similar to 100 GeV) propagating over cosmological distances can interact with the low-energy photons of the extragalactic background light (EBL) and produce electron-positron pairs. The transparency of the Universe to VHE gamma rays is then directly related to the spectral energy distribution (SED) of the EBL. The observation of features in the VHE energy spectra of extragalactic sources allows the EBL to be measured, which otherwise is very difficult. An EBL model-independent measurement of the EBL SED with the H.E.S.S. array of Cherenkov telescopes is presented. It was obtained by extracting the EBL absorption signal from the reanalysis of high-quality spectra of blazars. From H.E.S.S. data alone the EBL signature is detected at a significance of 9.5 sigma, and the intensity of the EBL obtained in different spectral bands is presented together with the associated gamma-ray horizon.
A search for dark matter linelike signals iss performed in the vicinity of the Galactic Center by the H.E.S.S. experiment on observational data taken in 2014. An unbinned likelihood analysis iss developed to improve the sensitivity to linelike signals. The upgraded analysis along with newer data extend the energy coverage of the previous measurement down to 100 GeV. The 18 h of data collected with the H.E.S.S. array allow one to rule out at 95% C.L. the presence of a 130 GeV line (at l = -1.5 degrees, b = 0 degrees and for a dark matter profile centered at this location) previously reported in Fermi-LAT data. This new analysis overlaps significantly in energy with previous Fermi-LAT and H.E.S.S. results. No significant excess associated with dark matter annihilations was found in the energy range of 100 GeV to 2 TeV and upper limits on the gamma-ray flux and the velocity weighted annihilation cross section are derived adopting an Einasto dark matter halo profile. Expected limits for present and future large statistics H.E.S.S. observations are also given.
We search for high-energy gamma-ray emission from the binary neutron star merger GW170817 with the H.E.S.S. Imaging Air Cherenkov Telescopes. The observations presented here have been obtained starting only 5.3 hr after GW170817. The H.E.S.S. target selection identified regions of high probability to find a counterpart of the gravitational-wave event. The first of these regions contained the counterpart SSS17a that has been identified in the optical range several hours after our observations. We can therefore present the first data obtained by a ground-based pointing instrument on this object. A subsequent monitoring campaign with the H.E.S.S. telescopes extended over several days, covering timescales from 0.22 to 5.2 days and energy ranges between 270 GeV to 8.55 TeV. No significant gamma-ray emission has been found. The derived upper limits on the very-high-energy gamma-ray flux for the first time constrain non-thermal, high-energy emission following the merger of a confirmed binary neutron star system.
The inner region of the Milky Way halo harbors a large amount of dark matter (DM). Given its proximity, it is one of the most promising targets to look for DM. We report on a search for the annihilations of DM particles using gamma-ray observations towards the inner 300 pc of the Milky Way, with the H.E.S.S. array of ground-based Cherenkov telescopes. The analysis is based on a 2D maximum likelihood method using Galactic Center (GC) data accumulated by H.E.S.S. over the last 10 years (2004-2014), and does not show any significant gamma-ray signal above background. Assuming Einasto and Navarro-Frenk-White DM density profiles at the GC, we derive upper limits on the annihilation cross section <sigma nu >. These constraints are the strongest obtained so far in the TeV DM mass range and improve upon previous limits by a factor 5. For the Einasto profile, the constraints reach <sigma nu > values of 6 x 10(-26) cm(3) s(-1) in the W+W- channel for a DM particle mass of 1.5 TeV, and 2 x 10(-26) cm(3) s(-1) in the tau(+)tau(-) channel for a 1 TeV mass. For the first time, ground-based gamma-ray observations have reached sufficient sensitivity to probe <sigma nu > values expected from the thermal relic density for TeV DM particles.
Gamma-ray bursts (GRBs) are brief flashes of gamma-rays and are considered to be the most energetic explosive phenomena in the Universe(1). The emission from GRBs comprises a short (typically tens of seconds) and bright prompt emission, followed by a much longer afterglow phase. During the afterglow phase, the shocked outflow-produced by the interaction between the ejected matter and the circumburst medium-slows down, and a gradual decrease in brightness is observed(2). GRBs typically emit most of their energy via.-rays with energies in the kiloelectronvolt-to-megaelectronvolt range, but a few photons with energies of tens of gigaelectronvolts have been detected by space-based instruments(3). However, the origins of such high-energy (above one gigaelectronvolt) photons and the presence of very-high-energy (more than 100 gigaelectronvolts) emission have remained elusive(4). Here we report observations of very-high-energy emission in the bright GRB 180720B deep in the GRB afterglow-ten hours after the end of the prompt emission phase, when the X-ray flux had already decayed by four orders of magnitude. Two possible explanations exist for the observed radiation: inverse Compton emission and synchrotron emission of ultrarelativistic electrons. Our observations show that the energy fluxes in the X-ray and gamma-ray range and their photon indices remain comparable to each other throughout the afterglow. This discovery places distinct constraints on the GRB environment for both emission mechanisms, with the inverse Compton explanation alleviating the particle energy requirements for the emission observed at late times. The late timing of this detection has consequences for the future observations of GRBs at the highest energies.
The flat spectrum radio quasar 3C 279 is known to exhibit pronounced variability in the high-energy (100MeV < E < 100 GeV) gamma-ray band, which is continuously monitored with Fermi-LAT. During two periods of high activity in April 2014 and June 2015 target-of-opportunity observations were undertaken with the High Energy Stereoscopic System (H.E.S.S.) in the very-high-energy (VHE, E > 100 GeV) gamma-ray domain. While the observation in 2014 provides an upper limit, the observation in 2015 results in a signal with 8 : 7 sigma significance above an energy threshold of 66 GeV. No VHE variability was detected during the 2015 observations. The VHE photon spectrum is soft and described by a power-law index of 4.2 +/- 0.3. The H.E.S.S. data along with a detailed and contemporaneous multiwavelength data set provide constraints on the physical parameters of the emission region. The minimum distance of the emission region from the central black hole was estimated using two plausible geometries of the broad-line region and three potential intrinsic spectra. The emission region is confidently placed at r greater than or similar to 1 : 7 X 1017 cm from the black hole, that is beyond the assumed distance of the broad-line region. Time-dependent leptonic and lepto-hadronic one-zone models were used to describe the evolution of the 2015 flare. Neither model can fully reproduce the observations, despite testing various parameter sets. Furthermore, the H.E.S.S. data were used to derive constraints on Lorentz invariance violation given the large redshift of 3C 279.
We report on the detection of very high energy (VHE; E > 100 GeV) gamma-ray emission from the BL Lac objects KUV 00311-1938 and PKS 1440-389 with the High Energy Stereoscopic System (H.E.S.S.). H.E.S.S. observations were accompanied or preceded by multiwavelength observations with Fermi/LAT, XRT and UVOT onboard the Swift satellite, and ATOM. Based on an extrapolation of the Fermi/LAT spectrum towards the VHE gamma-ray regime, we deduce a 95 per cent confidence level upper limit on the unknown redshift of KUV 00311-1938 of z < 0.98 and of PKS 1440-389 of z < 0.53. When combined with previous spectroscopy results, the redshift of KUV 00311-1938 is constrained to 0.51 <= z < 0.98 and of PKS 1440-389 to 0.14 (sic) z < 0.53.
We report on the detection of very high energy (VHE; E > 100 GeV) gamma-ray emission from the BL Lac objects KUV 00311-1938 and PKS 1440-389 with the High Energy Stereoscopic System (H.E.S.S.). H.E.S.S. observations were accompanied or preceded by multiwavelength observations with Fermi/LAT, XRT and UVOT onboard the Swift satellite, and ATOM. Based on an extrapolation of the Fermi/LAT spectrum towards the VHE gamma-ray regime, we deduce a 95 per cent confidence level upper limit on the unknown redshift of KUV 00311-1938 of z < 0.98 and of PKS 1440-389 of z < 0.53. When combined with previous spectroscopy results, the redshift of KUV 00311-1938 is constrained to 0.51 <= z < 0.98 and of PKS 1440-389 to 0.14 (sic) z < 0.53.
Dwarf spheroidal galaxies are among the most promising targets for detecting signals of Dark Matter (DM) annihilations. The H.E.S.S. experiment has observed five of these systems for a total of about 130 hours. The data are re-analyzed here, and, in the absence of any detected signals, are interpreted in terms of limits on the DM annihilation cross section. Two scenarios are considered: i) DM annihilation into mono-energetic gamma-rays and ii) DM in the form of pure WIMP multiplets that, annihilating into all electroweak bosons, produce a distinctive gamma-ray spectral shape with a high-energy peak at the DM mass and a lower-energy continuum. For case i), upper limits at 95% confidence level of about <sigma upsilon > less than or similar to 3 x 10(-25) cm(3) s(-1) are obtained in the mass range of 400 GeV to 1TeV. For case ii), the full spectral shape of the models is used and several excluded regions are identified, but the thermal masses of the candidates are not robustly ruled out.
Young core-collapse supernovae with dense-wind progenitors may be able to accelerate cosmic-ray hadrons beyond the knee of the cosmic-ray spectrum, and this may result in measurable gamma-ray emission. We searched for gamma-ray emission from ten super- novae observed with the High Energy Stereoscopic System (H.E.S.S.) within a year of the supernova event. Nine supernovae were observed serendipitously in the H.E.S.S. data collected between December 2003 and December 2014, with exposure times ranging from 1.4 to 53 h. In addition we observed SN 2016adj as a target of opportunity in February 2016 for 13 h. No significant gamma-ray emission has been detected for any of the objects, and upper limits on the >1 TeV gamma-ray flux of the order of similar to 10(-13) cm(-)(2)s(-1) are established, corresponding to upper limits on the luminosities in the range similar to 2 x 10(39) to similar to 1 x 10(42) erg s(-1). These values are used to place model-dependent constraints on the mass-loss rates of the progenitor stars, implying upper limits between similar to 2 x 10(-5) and similar to 2 x 10(-3) M-circle dot yr(-1) under reasonable assumptions on the particle acceleration parameters.
Context. NGC 253 is one of only two starburst galaxies found to emit gamma-rays from hundreds of MeV to multi-TeV energies. Accurate measurements of the very-high-energy (VHE; E> 100 GeV) and high-energy (HE; E > 60 MeV) spectra are crucial to study the underlying particle accelerators, probe the dominant emission mechanism(s) and to study cosmic-ray interaction and transport. Aims. The measurement of the VHE gamma-ray emission of NGC 253 published in 2012 by H.E.S.S. was limited by large systematic uncertainties. Here, the most up to date measurement of the gamma-ray spectrum of NGC 253 is investigated in both HE and VHE gamma-rays. Assuming a hadronic origin of the gamma-ray emission, the measurement uncertainties are propagated into the interpretation of the accelerated particle population. Methods. The data of H.E.S.S. observations are reanalysed using an updated calibration and analysis chain. The improved Fermi-LAT analysis employs more than 8 yr of data processed using pass 8. The cosmic-ray particle population is evaluated from the combined HE-VHE gamma-ray spectrum using NAIMA in the optically thin case. Results. The VHE gamma-ray energy spectrum is best fit by a power-law distribution with a flux normalisation of (1.34 +/- 0.14(stat) +/- 0.27(sys)) x 10(-13) cm(-2) s(-1) TeV-1 at 1 TeV - about 40% above, but compatible with the value obtained in Abramowski et al. (2012). The spectral index Gamma = 2.39 +/- 0.14(stat) +/- 0.25(sys) is slightly softer than but consistent with the previous measurement within systematic errors. In the Fermi energy range an integral flux of F(E > 60 MeV) = (1.56 +/- 0.28(stat) +/- 0.15(sys)) x 10(-8) cm(-2) s(-1) is obtained. At energies above similar to 3 GeV the HE spectrum is consistent with a power-law ranging into the VHE part of the spectrum measured by H.E.S.S. with an overall spectral index Gamma = 2.22 +/- 0.06(stat). Conclusions. Two scenarios for the starburst nucleus are tested, in which the gas in the starburst nucleus acts as either a thin or a thick target for hadronic cosmic rays accelerated by the individual sources in the nucleus. In these two models, the level to which NGC 253 acts as a calorimeter is estimated to a range of f(cal) = 0.1 to 1 while accounting for the measurement uncertainties. The presented spectrum is likely to remain the most accurate measurements until the Cherenkov Telescope Array (CTA) has collected a substantial set of data towards NGC 253.
A hotspot at a position compatible with the BL. Lac object 1ES 2322-409 was serendipitously detected with H.E.S.S. during observations performed in 2004 and 2006 on the blazar PKS 2316-423. Additional data on 1ES 2322-409 were taken in 2011 and 2012, leading to a total live-time of 22.3 h. Point-like very-high-energy (VHE; E > 100 GeV) gamma-ray emission is detected from a source centred on the IFS 2322-409 position, with an excess of 116.7 events at a significance of 6.0 sigma. The average VHE gamma-ray spectrum is well described with a power law with a photon index Gamma = 3.40 +/- 0.66(stat) +/- 0.20(sys) and an integral flux Phi(E > 200 GeV) = (3.11 +/- 0.71(stat) 0.62(sys)) x 10(-2)cm(-2)s(-1), which corresponds to 1.1 per cent of the Crab nebula flux above 200 GeV. Multiwavelength data obtained with Fermi LAT, Swift XRT and UVOT, RXTE PCA, ATOM, and additional data from WISE, GROND, and Catalina are also used to characterize the broad-band non-thermal emission of lES 2322-409. The multiwavelength behaviour indicates day-scale variability. Swift UVOT and XRT data show strong variability at longer scales. A spectral energy distribution (SED) is built from contemporaneous observations obtained around a high state identified in Swift data. A modelling of the SED is performed with a stationary homogeneous one-zone synchrotronself-Compton leptonic model. The redshift of the source being unknown, two plausible values were tested for the modelling. A systematic scan of the model parameters space is performed, resulting in a well-constrained combination of values providing a good description of the broad-band behaviour of 1ES 2322-409.
The blazar Mrk 501 (z = 0.034) was observed at very-high-energy (VHE, E greater than or similar to 100 GeV) gamma-ray wavelengths during a bright flare on the night of 2014 June 23-24 (MJD 56832) with the H.E.S.S. phase-II array of Cherenkov telescopes. Data taken that night by H.E.S.S. at large zenith angle reveal an exceptional number of gamma-ray photons at multi-TeV energies, with rapid flux variability and an energy coverage extending significantly up to 20 TeV. This data set is used to constrain Lorentz invariance violation (LIV) using two independent channels: a temporal approach considers the possibility of an energy dependence in the arrival time of gamma-rays, whereas a spectral approach considers the possibility of modifications to the interaction of VHE gamma-rays with extragalactic background light (EBL) photons. The non-detection of energy-dependent time delays and the non-observation of deviations between the measured spectrum and that of a supposed power-law intrinsic spectrum with standard EBL attenuation are used independently to derive strong constraints on the energy scale of LIV (E-QG) in the subluminal scenario for linear and quadratic perturbations in the dispersion relation of photons. For the case of linear perturbations, the 95% confidence level limits obtained are E-QG,E-1 > 3.6 x 10(17) GeV using the temporal approach and E-QG,E-1 > 2.6 x 10(19) GeV using the spectral approach. For the case of quadratic perturbations, the limits obtained are E-QG,E-2 > 8.5 x 10(10) GeV using the temporal approach and E-QG,E-2 > 7.8 x 10(11) GeV using the spectral approach.
First ground-based measurement of sub-20 GeV to 100 GeV gamma-Rays from the Vela pulsar with HESS II
(2018)
Aims. We report on the measurement and investigation of pulsed high-energy y-ray emission from the Vela pulsar, PSR B0833-45, based on observations with the largest telescope of H.E.S.S., CT5, in monoscopic mode, and on data obtained with the Fermi-LAT. Methods. Data from 40.3 h of observations carried out with the H.E.S.S. II array from 2013 to 2015 have been used. A dedicated very low-threshold event reconstruction and analysis pipeline was developed to achieve the lowest possible energy threshold. Eight years of Fermi-LAT data were analysed and also used as reference to validate the CT5 telescope response model and analysis methods. Results. A pulsed gamma-ray signal at a significance level of more than 15 sigma is detected from the P2 peak of the Vela pulsar light curve. Of a total of 15 835 events, more than 6000 lie at an energy below 20 GeV, implying a significant overlap between H.E.S.S. II-CT5 and the Fermi-LAT. While the investigation of the pulsar light curve with the LAT confirms characteristics previously known up to 20 GeV in the tens of GeV energy range, CT5 data show a change in the pulse morphology of P2, i.e. an extreme sharpening of its trailing edge, together with the possible onset of a new component at 3.4 sigma significance level. Assuming a power-law model for the P2 spectrum, an excellent agreement is found for the photon indices (Gamma similar or equal to 4.1) obtained with the two telescopes above 10 GeV and an upper bound of 8% is derived on the relative offset between their energy scales. Using data from both instruments, it is shown however that the spectrum of P2 in the 10-100 GeV has a pronounced curvature; this is a confirmation of the sub-exponential cut-off form found at lower energies with the LAT. This is further supported by weak evidence of an emission above 100 GeV obtained with CT5. In contrast, converging indications are found from both CT5 and LAT data for the emergence of a hard component above 50 GeV in the leading wing (LW2) of P2, which possibly extends beyond 100 GeV. Conclusions. The detection demonstrates the performance and understanding of CT5 from 100 GeV down to the sub-20 GeV domain, i.e. unprecedented low energy for ground-based gamma-ray astronomy. The extreme sharpening of the trailing edge of the P2 peak found in the H.E.S.S. II light curve of the Vela pulsar and the possible extension beyond 100 GeV of at least one of its features, LW2, provide further constraints to models of gamma-Ray emission from pulsars.
PKS 1830-211 is a known macrolensed quasar located at a redshift of z = 2.5. Its highenergy gamma-ray emission has been detected with the Fermi-Large Area Telescope (LAT) instrument and evidence for lensing was obtained by several authors from its high-energy data. Observations of PKS 1830-211 were taken with the High Energy Stereoscopic System (H.E.S.S.) array of Imaging Atmospheric Cherenkov Telescopes in 2014 August, following a flare alert by the Fermi-LAT Collaboration. The H.E.S.S observations were aimed at detecting a gamma-ray flare delayed by 20-27 d from the alert flare, as expected from observations at other wavelengths. More than 12 h of good-quality data were taken with an analysis threshold of similar to 67 GeV. The significance of a potential signal is computed as a function of the date and the average significance over the whole period. Data are compared to simultaneous observations by Fermi-LAT. No photon excess or significant signal is detected. An upper limit on PKS 1830-211 flux above 67 GeV is computed and compared to the extrapolation of the Fermi-LAT flare spectrum.
Context. We present a detailed view of the pulsar wind nebula (PWN) HESS J1825-137. We aim to constrain the mechanisms dominating the particle transport within the nebula, accounting for its anomalously large size and spectral characteristics. Aims. The nebula was studied using a deep exposure from over 12 years of H.E.S.S. I operation, together with data from H.E.S.S. II that improve the low-energy sensitivity. Enhanced energy-dependent morphological and spatially resolved spectral analyses probe the very high energy (VHE, E > 0.1 TeV) gamma-ray properties of the nebula. Methods. The nebula emission is revealed to extend out to 1.5 degrees from the pulsar, similar to 1.5 times farther than previously seen, making HESS J1825-137, with an intrinsic diameter of similar to 100 pc, potentially the largest gamma-ray PWN currently known. Characterising the strongly energy-dependent morphology of the nebula enables us to constrain the particle transport mechanisms. A dependence of the nebula extent with energy of R proportional to E alpha with alpha = -0.29 +/- 0.04(stat) +/- 0.05(sys) disfavours a pure diffusion scenario for particle transport within the nebula. The total gamma-ray flux of the nebula above 1 TeV is found to be (1.12 +/- 0.03(stat) +/- 0.25(sys)) +/- 10(-11) cm(-2) s(-1), corresponding to similar to 64% of the flux of the Crab nebula. Results. HESS J1825-137 is a PWN with clearly energy-dependent morphology at VHE gamma-ray energies. This source is used as a laboratory to investigate particle transport within intermediate-age PWNe. Based on deep observations of this highly spatially extended PWN, we produce a spectral map of the region that provides insights into the spectral variation within the nebula.
Context. Pulsar wind nebulae (PWNe) represent the most prominent population of Galactic very-high-energy gamma-ray sources and are thought to be an efficient source of leptonic cosmic rays. Vela X is a nearby middle-aged PWN, which shows bright X-ray and TeV gamma-ray emission towards an elongated structure called the cocoon. Aims. Since TeV emission is likely inverse-Compton emission of electrons, predominantly from interactions with the cosmic microwave background, while X-ray emission is synchrotron radiation of the same electrons, we aim to derive the properties of the relativistic particles and of magnetic fields with minimal modelling. Methods. We used data from the Suzaku XIS to derive the spectra from three compact regions in Vela X covering distances from 0.3 to 4 pc from the pulsar along the cocoon. We obtained gamma-ray spectra of the same regions from H.E.S.S. observations and fitted a radiative model to the multi-wavelength spectra. Results. The TeV electron spectra and magnetic field strengths are consistent within the uncertainties for the three regions, with energy densities of the order 10(-12) erg cm(-3). The data indicate the presence of a cutoff in the electron spectrum at energies of similar to 100 TeV and a magnetic field strength of similar to 6 mu G. Constraints on the presence of turbulent magnetic fields are weak. Conclusions. The pressure of TeV electrons and magnetic fields in the cocoon is dynamically negligible, requiring the presence of another dominant pressure component to balance the pulsar wind at the termination shock. Sub-TeV electrons cannot completely account for the missing pressure, which may be provided either by relativistic ions or from mixing of the ejecta with the pulsar wind. The electron spectra are consistent with expectations from transport scenarios dominated either by advection via the reverse shock or by diffusion, but for the latter the role of radiative losses near the termination shock needs to be further investigated in the light of the measured cutoff energies. Constraints on turbulent magnetic fields and the shape of the electron cutoff can be improved by spectral measurements in the energy range greater than or similar to 10 keV.
Context. Recently, the high-energy (HE, 0.1-100 GeV) gamma-ray emission from the object LMC P3 in the Large Magellanic Cloud (LMC) has been discovered to be modulated with a 10.3-day period, making it the first extra-galactic gamma-ray binary. Aims. This work aims at the detection of very-high-energy (VHE, >100 GeV) gamma-ray emission and the search for modulation of the VHE signal with the orbital period of the binary system. Methods. LMC P3 has been observed with the High Energy Stereoscopic System (H.E.S.S.); the acceptance-corrected exposure time is 100 h. The data set has been folded with the known orbital period of the system in order to test for variability of the emission. Results. VHE gamma-ray emission is detected with a statistical significance of 6.4 sigma. The data clearly show variability which is phase-locked to the orbital period of the system. Periodicity cannot be deduced from the H.E.S.S. data set alone. The orbit-averaged luminosity in the 1-10 TeV energy range is (1.4 +/- 0.2) x 10(35) erg s(-1). A luminosity of (5 +/- 1) x 10(35) erg s(-1) is reached during 20% of the orbit. HE and VHE gamma-ray emissions are anti-correlated. LMC P3 is the most luminous gamma-ray binary known so far.
Proceedings of KogWis 2010 : 10th Biannual Meeting of the German Society for Cognitive Science
(2010)
As the latest biannual meeting of the German Society for Cognitive Science (Gesellschaft für Kognitionswissenschaft, GK), KogWis 2010 at Potsdam University reflects the current trends in a fascinating domain of research concerned with human and artificial cognition and the interaction of mind and brain. The Plenary talks provide a venue for questions of the numerical capacities and human arithmetic (Brian Butterworth), of the theoretical development of cognitive architectures and intelligent virtual agents (Pat Langley), of categorizations induced by linguistic constructions (Claudia Maienborn), and of a cross-level account of the “Self as a complex system“ (Paul Thagard). KogWis 2010 integrates a wealth of experimental research, cognitive modelling, and conceptual analysis in 5 invited symposia, over 150 individual talks, 6 symposia, and more than 40 poster contributions. Some of the invited symposia reflect local and regional strenghts of research in the Berlin-Brandenburg area: the two largests research fields of the university Cognitive Sciences Area of Excellence in Potsdam are represented by an invited symposium on “Information Structure” by the Special Research Area 632 (“Sonderforschungsbereich”, SFB) of the same name, of Potsdam University and Humboldt-University Berlin, and by a satellite conference of the research group “Mind and Brain Dynamics”. The Berlin School of Mind and Brain at Humboldt-University Berlin takes part with an invited symposium on “Decision Making” from a perspective of cognitive neuroscience and philosophy and the DFG Cluster of Excellence “Languages of Emotion” of Free University presents interdisciplinary research results in an invited symposium on “Symbolising Emotions”.
Historischer November in Palästina : Zwei-Staaten-Lösung versus dauerhafte Besatzung durch Israel
(2013)
Der November 2012 wird sicherlich als ein historischer Monat in die palästinensische Geschichte eingehen. Im November begann die israelische Armee mit der gezielten Tötung eines hohen Funktionärs der Hamas einen Luftkrieg gegen den Gazastreifen. Nach acht Tagen wurde Israel durch internationalen Druck gezwungen, einen Waffenstillstand mit der Hamas zu akzeptieren. Einmal mehr zeigte sich, dass der Nahostkonflikt nicht mit militärischer Gewalt zu lösen ist. Dies kann nur mit einer Zwei-Staaten-Lösung erreicht werden, der substanzielle und ehrliche Verhandlungen vorausgehen.
Lamprophyre sind porphyrische, aus Mantelschmelzen gebildete Gesteine, die meist in Form von Gängen auftreten. Sie zeichnen sich durch auffällige und charakteristische texturelle, chemische und mineralogische Eigenschaften aus. Als ehemalige Mantelschmelzen liefern sie Information sowohl über Bedingungen der Schmelzbildung im Mantel als auch über geodynamische Prozesse, die zu metasomatischer Veränderung des Mantels geführt haben. Im Saxothuringikum Mitteleuropas, am Nordrand des Böhmischen Massivs, gibt es zahlreiche Lamprophyrvorkommen, die hier zur Charakterisierung der Mantelentwicklung während der variszischen Orogenese dienen. Die vorliegende Arbeit befaßt sich mit den mineralogischen, geochemischen und isotopischen (Sr-Nd-Pb) Signaturen von spätvariszischen kalkalkalischen Lamprophyren, von postvariszischen ultramafischen Lamprophyren, von Alkalibasalten der Lausitz und, zum Vergleich, von prävariszischen Gabbros. Darüberhinaus nutzt die Arbeit Lithium-Isotopensignaturen kombiniert mit Sr-Nd-Pb–Isotopendaten spätvariszischer kalkalkalischer Lamprophyre aus drei variszischen Domänen (Erzgebirge, Lausitz, Sudeten) zur Erkundung der lokalen Mantelüberprägungen während der variszischen Orogenese.
Deep metric learning employs deep neural networks to embed instances into a metric space such that distances between instances of the same class are small and distances between instances from different classes are large. In most existing deep metric learning techniques, the embedding of an instance is given by a feature vector produced by a deep neural network and Euclidean distance or cosine similarity defines distances between these vectors. This paper studies deep distributional embeddings of sequences, where the embedding of a sequence is given by the distribution of learned deep features across the sequence. The motivation for this is to better capture statistical information about the distribution of patterns within the sequence in the embedding. When embeddings are distributions rather than vectors, measuring distances between embeddings involves comparing their respective distributions. The paper therefore proposes a distance metric based on Wasserstein distances between the distributions and a corresponding loss function for metric learning, which leads to a novel end-to-end trainable embedding model. We empirically observe that distributional embeddings outperform standard vector embeddings and that training with the proposed Wasserstein metric outperforms training with other distance functions.
A central insight from psychological studies on human eye movements is that eye movement patterns are highly individually characteristic. They can, therefore, be used as a biometric feature, that is, subjects can be identified based on their eye movements. This thesis introduces new machine learning methods to identify subjects based on their eye movements while viewing arbitrary content. The thesis focuses on probabilistic modeling of the problem, which has yielded the best results in the most recent literature. The thesis studies the problem in three phases by proposing a purely probabilistic, probabilistic deep learning, and probabilistic deep metric learning approach. In the first phase, the thesis studies models that rely on psychological concepts about eye movements. Recent literature illustrates that individual-specific distributions of gaze patterns can be used to accurately identify individuals. In these studies, models were based on a simple parametric family of distributions. Such simple parametric models can be robustly estimated from sparse data, but have limited flexibility to capture the differences between individuals. Therefore, this thesis proposes a semiparametric model of gaze patterns that is flexible yet robust for individual identification. These patterns can be understood as domain knowledge derived from psychological literature. Fixations and saccades are examples of simple gaze patterns. The proposed semiparametric densities are drawn under a Gaussian process prior centered at a simple parametric distribution. Thus, the model will stay close to the parametric class of densities if little data is available, but it can also deviate from this class if enough data is available, increasing the flexibility of the model. The proposed method is evaluated on a large-scale dataset, showing significant improvements over the state-of-the-art. Later, the thesis replaces the model based on gaze patterns derived from psychological concepts with a deep neural network that can learn more informative and complex patterns from raw eye movement data. As previous work has shown that the distribution of these patterns across a sequence is informative, a novel statistical aggregation layer called the quantile layer is introduced. It explicitly fits the distribution of deep patterns learned directly from the raw eye movement data. The proposed deep learning approach is end-to-end learnable, such that the deep model learns to extract informative, short local patterns while the quantile layer learns to approximate the distributions of these patterns. Quantile layers are a generic approach that can converge to standard pooling layers or have a more detailed description of the features being pooled, depending on the problem. The proposed model is evaluated in a large-scale study using the eye movements of subjects viewing arbitrary visual input. The model improves upon the standard pooling layers and other statistical aggregation layers proposed in the literature. It also improves upon the state-of-the-art eye movement biometrics by a wide margin. Finally, for the model to identify any subject — not just the set of subjects it is trained on — a metric learning approach is developed. Metric learning learns a distance function over instances. The metric learning model maps the instances into a metric space, where sequences of the same individual are close, and sequences of different individuals are further apart. This thesis introduces a deep metric learning approach with distributional embeddings. The approach represents sequences as a set of continuous distributions in a metric space; to achieve this, a new loss function based on Wasserstein distances is introduced. The proposed method is evaluated on multiple domains besides eye movement biometrics. This approach outperforms the state of the art in deep metric learning in several domains while also outperforming the state of the art in eye movement biometrics.
Different properties of programs, implemented in Constraint Handling Rules (CHR), have already been investigated. Proving these properties in CHR is fairly simpler than proving them in any type of imperative programming language, which triggered the proposal of a methodology to map imperative programs into equivalent CHR. The equivalence of both programs implies that if a property is satisfied for one, then it is satisfied for the other. The mapping methodology could be put to other beneficial uses. One such use is the automatic generation of global constraints, at an attempt to demonstrate the benefits of having a rule-based implementation for constraint solvers.
Say it with double flowers
(2020)
Every year, lovers world-wide rely on mutants to show their feelings on Valentine's Day. This is because many of the most popular ornamental flowering plants have been selected to form extra petals at the expense of reproductive organs to enhance their attractiveness and aesthetic value to humans. This so-called 'double flower' (DF) phenotype, first described more than 2000 years ago (Meyerowitz et al., 1989) is present, for example, in many modern roses, carnations, peonies, and camellias. Gattolin et al. (2020) now identify a unifying explanation for the molecular basis of many of these DF cultivars.
Phytochemical investigation of the dichloromethane/methanol (1:1) extract of the roots of Bulbine frutescens led to the isolation of a new xanthone, 8-hydroxy-6-methylxanthone-1-carboxylic acid (1) and a new phenylanthraquinone, 6',8-O-dimethylknipholone (2) along with six known compounds. The structures were elucidated on the basis of NMR and MS spectral data analyses. The structure of compound 1 was confirmed through X-ray crystallography which was then used as a reference to propose the revision of the structures of six seco-anthraquinones into xanthones. The isolated compounds were evaluated for cytotoxicity against human cervix carcinoma KB-3-1 cells with the phenylanthraquinone knipholone being the most active (IC50 = 0.43 mu M). Two semi-synthetic knipholone derivatives, knipholone Mannich base and knipholone-1,3-oxazine, were prepared and tested for cytotoxic activity; both showed moderate activities (IC50 value of 1.89 and 2.50 mu M, respectively). (C) 2014 Phytochemical Society of Europe. Published by Elsevier B.V. All rights reserved.
A new phenylanthrone, named knipholone cyclooxanthrone and a dimeric anthraquinone, 10-methoxy-10,7'-(chrysophanol anthrone)-chrysophanol were isolated from the roots of Kniphofia foliosa together with the rare naphthalene glycoside, dianellin. The structures were determined by NMR and mass spectroscopic techniques. The compounds showed antiplasmodial activities against the chloroquine-resistant (W2) and chloroquine-sensitive (D6) strains of Plasmodium falciparum with 10-methoxy-10,7'-(chrysophanol anthrone)-chrysophanol being the most active with IC50 values of 1.17 +/- 0.12 and 4.07 +/- 1.54 mu g/ml, respectively.
We report on the gamma-ray activity of the blazar Mrk 501 during the first 480 days of Fermi operation. We find that the average Large Area Telescope (LAT) gamma-ray spectrum of Mrk 501 can be well described by a single power-law function with a photon index of 1.78 +/- 0.03. While we observe relatively mild flux variations with the Fermi-LAT (within less than a factor of two), we detect remarkable spectral variability where the hardest observed spectral index within the LAT energy range is 1.52 +/- 0.14, and the softest one is 2.51 +/- 0.20. These unexpected spectral changes do not correlate with the measured flux variations above 0.3 GeV. In this paper, we also present the first results from the 4.5 month long multifrequency campaign (2009 March 15-August 1) on Mrk 501, which included the Very Long Baseline Array (VLBA), Swift, RXTE, MAGIC, and VERITAS, the F-GAMMA, GASP-WEBT, and other collaborations and instruments which provided excellent temporal and energy coverage of the source throughout the entire campaign. The extensive radio to TeV data set from this campaign provides us with the most detailed spectral energy distribution yet collected for this source during its relatively low activity. The average spectral energy distribution of Mrk 501 is well described by the standard one-zone synchrotron self-Compton (SSC) model. In the framework of this model, we find that the dominant emission region is characterized by a size less than or similar to 0.1 pc (comparable within a factor of few to the size of the partially resolved VLBA core at 15-43 GHz), and that the total jet power (similar or equal to 10(44) erg s(-1)) constitutes only a small fraction (similar to 10(-3)) of the Eddington luminosity. The energy distribution of the freshly accelerated radiating electrons required to fit the time-averaged data has a broken power-law form in the energy range 0.3 GeV-10 TeV, with spectral indices 2.2 and 2.7 below and above the break energy of 20 GeV. We argue that such a form is consistent with a scenario in which the bulk of the energy dissipation within the dominant emission zone of Mrk 501 is due to relativistic, proton-mediated shocks. We find that the ultrarelativistic electrons and mildly relativistic protons within the blazar zone, if comparable in number, are in approximate energy equipartition, with their energy dominating the jet magnetic field energy by about two orders of magnitude.
Observations of the young supernova remnant RX J1713.7-3946 with the fermi large area telescope
(2011)
We present observations of the young supernova remnant (SNR) RX J1713.7-3946 with the Fermi Large Area Telescope (LAT). We clearly detect a source positionally coincident with the SNR. The source is extended with a best-fit extension of 0 degrees.55 +/- 0 degrees.04 matching the size of the non-thermal X-ray and TeV gamma-ray emission from the remnant. The positional coincidence and the matching extended emission allow us to identify the LAT source with SNR RX J1713.7-3946. The spectrum of the source can be described by a very hard power law with a photon index of Gamma = 1.5 +/- 0.1 that coincides in normalization with the steeper H. E. S. S.-detected gamma-ray spectrum at higher energies. The broadband gamma-ray emission is consistent with a leptonic origin as the dominant mechanism for the gamma-ray emission.
This paper offers a new theoretical framework for studying the problem of generations and social change in contemporary Iran. It offers a model which is called „articulation of cultural modes“. The paper agrees with Ronald Inglehart that ‘culture’ is now playing a more dominant role in the social formation of current societies, as ‘technology’ once did in the modern era. But it goes one step further by arguing that culture cannot be approached as a holistic concept building on a comprehensive theoretical framework.
Combining the advection-diffusion equation approach with Monte Carlo simulations we study chaperone driven polymer translocation of a stiff polymer through a nanopore. We demonstrate that the probability density function of first passage times across the pore depends solely on the Peclet number, a dimensionless parameter comparing drift strength and diffusivity. Moreover it is shown that the characteristic exponent in the power-law dependence of the translocation time on the chain length, a function of the chaperone-polymer binding energy, the chaperone concentration, and the chain length, is also effectively determined by the Peclet number. We investigate the effect of the chaperone size on the translocation process. In particular, for large chaperone size, the translocation progress and the mean waiting time as function of the reaction coordinate exhibit pronounced sawtooth-shapes. The effects of a heterogeneous polymer sequence on the translocation dynamics is studied in terms of the translocation velocity, the probability distribution for the translocation progress, and the monomer waiting times. (C) 2011 American Institute of Physics.
Das Paper untersucht die geopolitische Konfrontation zwischen Iran und den USA sowie deren Auswirkung auf eine Veränderung der bestehenden Weltordnung. Es wird deutlich, dass die US-amerikanische Sanktionspolitik nicht nur auf das Nuklearprogramm abzielt, sondern grundsätzlich versucht, die Wirtschaftskraft der unabhängig von den Interessen der USA agierenden Regionalmacht zu brechen. Doch die Sanktionspolitik konnte weder eine Lösung des Nukleardossiers herbeiführen noch die Wirtschaftskraft Irans eindämmen. Es ist Zeit für eine fundamentale Kursänderung.
Was treibt den Ölpreis?
(2009)
Der Rohölpreis wird über Angebot und Nachfrage reguliert – so jedenfalls die landläufige Auffassung. Die Autoren, beide ausgewiesene Energieexperten, zeigen jedoch auf, dass sich die drastischen Preisschwankungen auf den Energiemärkten nicht allein durch Marktmechanismen erklären lassen. Stattdessen führen sie den volatilen Ölpreis auf politische (Fehl-) Entscheidungen zurück und empfehlen einen Energiedialog zwischen Verbrauchern und Produzenten.
Ionic guest in ionic host
(2022)
Ionosilica ionogels, i.e. composites consisting of an ionic liquid (IL) guest confined in an ionosilica host matrix, were synthesized via a non-hydrolytic sol-gel procedure from a tris-trialcoxysilylated amine precursor using the IL [BMIM]NTf2 as solvent. Various ionosilica ionogels were prepared starting from variable volumes of IL in the presence of formic acid. The resulting brittle and nearly colourless monoliths are composed of different amounts of IL guests confined in an ionosilica host as evidenced via thermogravimetric analysis, FT-IR, and C-13 CP-MAS solid-state NMR spectroscopy. In the following, we focused on confinement effects between the ionic host and guest. Special host-guest interactions between the IL guest and the ionosilica host were evidenced by H-1 solid-state NMR, Raman spectroscopy, and broadband dielectric spectroscopy (BDS) measurements. The three techniques indicate a strongly reduced ion mobility in the ionosilica ionogel composites containing small volume fractions of confined IL, compared to conventional silica-based ionogels. We conclude that the ionic ionosilica host stabilizes an IL layer on the host surface; this then results in a strongly reduced ion mobility compared to conventional silica hosts. The ion mobility progressively increases for systems containing higher volume fractions of IL and finally reaches the values observed in conventional silica based ionogels. These results therefore point towards strong interactions and confinement effects between the ionic host and the ionic guest on the ionosilica surface. Furthermore, this approach allows confining high volume fractions of IL into self-standing monoliths while preserving high ionic conductivity. These effects may be of interest in domains where IL phases must be anchored on solid supports to avoid leaching or IL spilling, e.g., in catalysis, in gas separation/sequestration devices or for the elaboration of solid electrolytes for (lithium-ion) batteries and supercapacitors.
One of the major challenges in chemical synthesis is to trigger and control a specific reaction route leading to a specific final product, while side products are avoided. Methodologies based on resonant processes at the molecular level, for example, photochemistry, offer the possibility of inducing selective reactions. Electrons at energies below the molecular ionization potential (<10 eV) are known to dissociate molecules via resonant processes with higher cross sections and specificity than photons. Here we show that even subexcitation electrons with energies as low as 1 eV produce ethylene and acetylene from dimethyl sulfide in competing reactions. However, the production of ethylene can specifically be targeted by controlling the energy of electrons (similar to 3 to 4 eV). Finally, pure ethylene is selectively desorbed by heating the substrate from 90 to 105 K. Beyond the synthesis of these versatile hydrocarbons for various industrial applications from a biogenic sulfur compound, our findings demonstrate the feasibility of electron induced selective chemistry applicable on the nanoscale.
The 11 July 1889 Chilik earthquake (M-w 8.0-8.3) forms part of a remarkable sequence of large earthquakes in the late nineteenth and early twentieth centuries in the northern Tien Shan. Despite its importance, the source of the 1889 earthquake remains unknown, though the macroseismic epicenter is sited in the Chilik valley, similar to 100 km southeast of Almaty, Kazakhstan (similar to 2 million population). Several short fault segments that have been inferred to have ruptured in 1889 are too short on their own to account for the estimated magnitude. In this paper we perform detailed surveying and trenching of the similar to 30 km long Saty fault, one of the previously inferred sources, and find that it was formed in a single earthquake within the last 700 years, involving surface slip of up to 10 m. The scarp-forming event, likely to be the 1889 earthquake, was the only surface-rupturing event for at least 5000 years and potentially for much longer. From satellite imagery we extend the mapped length of fresh scarps within the 1889 epicentral zone to a total of similar to 175 km, which we also suggest as candidate ruptures from the 1889 earthquake. The 175 km of rupture involves conjugate oblique left-lateral and right-lateral slip on three separate faults, with step overs of several kilometers between them. All three faults were essentially invisible in the Holocene geomorphology prior to the last slip. The recurrence interval between large earthquakes on any of these faults, and presumably on other faults of the Tien Shan, may be longer than the timescale over which the landscape is reset, providing a challenge for delineating sources of future hazard.
Background There is scant information on the breastmilk vitamin A (BMVA) concentration of lactating women in developing countries, partly due to lack of methods applicable in-field. Objective To assess BMVA concentrations of samples collected from lactating women of children aged 6-23 months, in Mecha district, Ethiopia. Subjects/methods Data on socio-demographic and anthropometric characteristics were collected from randomly selected lactating women (n = 104). Breast milk samples were collected and vitamin A concentrations were analyzed using HPLC and iCheck FLUORO then the two measurements were compared. Results The prevalence of underweight (BMI < 18.5 kg/m(2)) among lactating women was 17%. Seventy six percent of the BMVA values were < 1.05 mu mol/l and 81% were < 8 mu g/g fat. The mean BMVA concentration accounted to 41% of the estimated average value for mothers in developing countries. The BMVA values from HPLC and iCheck were correlated (r = 0.59, p = < 0.001), but it was not strong. Conclusions The result indicates the low vitamin A status of the lactating women and their children. It further indicates that intake assessments should not use average BMVA composition. The possibility of using iCheck for monitoring interventions designed to improve vitamin A status of lactating women with low BMVA requires further investigation.
We establish elements of a new approach to ellipticity and parametrices within operator algebras on manifolds with higher singularities, only based on some general axiomatic requirements on parameter-dependent operators in suitable scales of spaes. The idea is to model an iterative process with new generations of parameter-dependent operator theories, together with new scales of spaces that satisfy analogous requirements as the original ones, now on a corresponding higher level. The "full" calculus involves two separate theories, one near the tip of the corner and another one at the conical exit to infinity. However, concerning the conical exit to infinity, we establish here a new concrete calculus of edge-degenerate operators which can be iterated to higher singularities.
We establish elements of a new approch to ellipticity and parametrices within operator algebras on a manifold with higher singularities, only based on some general axiomatic requirements on parameter-dependent operators in suitable scales of spaces. The idea is to model an iterative process with new generations of parameter-dependent operator theories, together with new scales of spaces that satisfy analogous requirements as the original ones, now on a corresponding higher level. The “full” calculus is voluminous; so we content ourselves here with some typical aspects such as symbols in terms of order reducing families, classes of relevant examples, and operators near the conical exit to infinity.
Linked Open Data (LOD) comprises very many and often large public data sets and knowledge bases. Those datasets are mostly presented in the RDF triple structure of subject, predicate, and object, where each triple represents a statement or fact. Unfortunately, the heterogeneity of available open data requires significant integration steps before it can be used in applications. Meta information, such as ontological definitions and exact range definitions of predicates, are desirable and ideally provided by an ontology. However in the context of LOD, ontologies are often incomplete or simply not available. Thus, it is useful to automatically generate meta information, such as ontological dependencies, range definitions, and topical classifications. Association rule mining, which was originally applied for sales analysis on transactional databases, is a promising and novel technique to explore such data. We designed an adaptation of this technique for min-ing Rdf data and introduce the concept of “mining configurations”, which allows us to mine RDF data sets in various ways. Different configurations enable us to identify schema and value dependencies that in combination result in interesting use cases. To this end, we present rule-based approaches for auto-completion, data enrichment, ontology improvement, and query relaxation. Auto-completion remedies the problem of inconsistent ontology usage, providing an editing user with a sorted list of commonly used predicates. A combination of different configurations step extends this approach to create completely new facts for a knowledge base. We present two approaches for fact generation, a user-based approach where a user selects the entity to be amended with new facts and a data-driven approach where an algorithm discovers entities that have to be amended with missing facts. As knowledge bases constantly grow and evolve, another approach to improve the usage of RDF data is to improve existing ontologies. Here, we present an association rule based approach to reconcile ontology and data. Interlacing different mining configurations, we infer an algorithm to discover synonymously used predicates. Those predicates can be used to expand query results and to support users during query formulation. We provide a wide range of experiments on real world datasets for each use case. The experiments and evaluations show the added value of association rule mining for the integration and usability of RDF data and confirm the appropriateness of our mining configuration methodology.
Unique column combinations of a relational database table are sets of columns that contain only unique values. Discovering such combinations is a fundamental research problem and has many different data management and knowledge discovery applications. Existing discovery algorithms are either brute force or have a high memory load and can thus be applied only to small datasets or samples. In this paper, the wellknown GORDIAN algorithm and "Apriori-based" algorithms are compared and analyzed for further optimization. We greatly improve the Apriori algorithms through efficient candidate generation and statistics-based pruning methods. A hybrid solution HCAGORDIAN combines the advantages of GORDIAN and our new algorithm HCA, and it significantly outperforms all previous work in many situations.
Parameterisierung atmosphärischer Grenzschichtprozesse in einem regionalen Klimamodell der Arktis
(1998)
Development of efficient business process models and determination of their characteristic properties are subject of intense interdisciplinary research. Here, we consider a business process model as a directed graph. Its nodes correspond to the units identified by the modeler and the link direction indicates the causal dependencies between units. It is of primary interest to obtain the stationary flow on such a directed graph, which corresponds to the steady-state of a firm during the business process. Following the ideas developed recently for the World Wide Web, we construct the Google matrix for our business process model and analyze its spectral properties. The importance of nodes is characterized by PageRank and recently proposed CheiRank and 2DRank, respectively. The results show that this two-dimensional ranking gives a significant information about the influence and communication properties of business model units. We argue that the Google matrix method, described here, provides a new efficient tool helping companies to make their decisions on how to evolve in the exceedingly dynamic global market.
This article describes how to use statistical data analysis to obtain models directly from data. The focus is put on finding nonlinearities within a generalized additive model. These models are found by means of backfitting or more general algorithms, like the alternating conditional expectation value one. The method is illustrated by numerically generated data. As an application, the example of vortex ripple dynamics, a highly complex fluid-granular system, is treated
We present a nonparametric way to retrieve an additive system of differential equations in embedding space from a single time series. These equations can be treated with dynamical systems theory and allow for long-term predictions. We apply our method to a modified chaotic Chua oscillator in order to demonstrate its potential
We report measurements on the synchronization properties of organ pipes. First, we investigate influence of an external acoustical signal from a loudspeaker on the sound of an organ pipe. Second, the mutual influence of two pipes with different pitch is analyzed. In analogy to the externally driven, or mutually coupled self-sustained oscillators, one observes a frequency locking, which can be explained by synchronization theory. Further, we measure the dependence of the frequency of the signals emitted by two mutually detuned pipes with varying distance between the pipes. The spectrum shows a broad '' hump '' structure, not found for coupled oscillators. This indicates a complex coupling of the two organ pipes leading to nonlinear beat phenomena.
The Problem of front propagation in flowing media is addressed for laminar velocity fields in two dimensions. Three representative cases are discussed: stationary cellular flow, stationary shear flow, and percolating flow. Production terms of Fisher-Kolmogorov-Petrovskii-Piskunov type and of Arrhenius type are considered under the assumption of no feedback of the concentration on the velocity. Numerical simulations of advection-reaction-diffusion equations have been performed by an algorithm based on discrete-time maps. The results show a generic enhancement of the speed of front propagation by the underlying flow. For small molecular diffusivity, the front speed <i>V<sub><i>f</sub> depends on the typical flow velocity <i>U as<sup> </sup>a power law with an exponent depending on the topological properties of the flow, and on the ratio of reactive and advective time scales. For open-streamline flows we find always<sup> </sup><i>V<sub><i>f</sub>~<i>U, whereas for cellular flows we observe <i>V<sub><i>f</ sub>~<i>U<sup>1/4</sup> for fast advection and <i>V<sub><i>f</sub>~<i>U<sup>3/4</sup> for slow advection.
We study spatially localized excitations in a lattice of coupled standard maps. Time-periodic solutions (breathers) exist in a range of coupling that is shown to shrink as the period grows to infinity, thus excluding the possibility of time-quasiperiodic breathers. The evolution of initially localized chaotic and quasiperiodic states in a lattice is studied numerically. Chaos is demonstrated to spread
Komplexe Systeme reichen von "harten", physikalischen, wie Klimaphysik, Turbulenz in Fluiden oder Plasmen bis zu so genannten "weichen", wie man sie in der Biologie, der Physik weicher Materie, Soziologie oder Ökonomie findet. Die Ausbildung von Verständnis zu einem solchen System beinhaltet eine Beschreibung in Form von Statistiken und schlussendlich mathematischen Gleichungen. Moderne Datenanalyse stellt eine große Menge von Werkzeugen zur Analyse von Komplexität auf verschiedenen Beschreibungsebenen bereit. In diesem Kurs werden statistische Methoden mit einem Schwerpunkt auf dynamischen Systemen diskutiert und eingeübt. Auf der methodischen Seite werden lineare und nichtlineare Ansätze behandelt, inklusive der Standard-Werkzeuge der deskriptiven und schlussfolgernden Statistik, Wavelet Analyse, Nichtparametrische Regression und der Schätzung nichtlinearer Maße wie fraktaler Dimensionen, Entropien und Komplexitätsmaßen. Auf der Modellierungsseite werden deterministische und stochastische Systeme, Chaos, Skalierung und das Entstehen von Komplexität durch Wechselwirkung diskutiert - sowohl für diskrete als auch für ausgedehnte Systeme. Die beiden Ansätze werden durch Systemanalyse jeweils passender Beispiele vereint.
Komplexe Systeme reichen von "harten", physikalischen, wie Klimaphysik, Turbulenz in Fluiden oder Plasmen bis zu so genannten "weichen", wie man sie in der Biologie, der Physik weicher Materie, Soziologie oder Ökonomie findet. Die Ausbildung von Verständnis zu einem solchen System beinhaltet eine Beschreibung in Form von Statistiken und schlussendlich mathematischen Gleichungen. Moderne Datenanalyse stellt eine große Menge von Werkzeugen zur Analyse von Komplexität auf verschiedenen Beschreibungsebenen bereit. In diesem Kurs werden statistische Methoden mit einem Schwerpunkt auf dynamischen Systemen diskutiert und eingeübt. Auf der methodischen Seite werden lineare und nichtlineare Ansätze behandelt, inklusive der Standard-Werkzeuge der deskriptiven und schlussfolgernden Statistik, Wavelet Analyse, Nichtparametrische Regression und der Schätzung nichtlinearer Maße wie fraktaler Dimensionen, Entropien und Komplexitätsmaßen. Auf der Modellierungsseite werden deterministische und stochastische Systeme, Chaos, Skalierung und das Entstehen von Komplexität durch Wechselwirkung diskutiert - sowohl für diskrete als auch für ausgedehnte Systeme. Die beiden Ansätze werden durch Systemanalyse jeweils passender Beispiele vereint.
Komplexe Systeme reichen von "harten", physikalischen, wie Klimaphysik, Turbulenz in Fluiden oder Plasmen bis zu so genannten "weichen", wie man sie in der Biologie, der Physik weicher Materie, Soziologie oder Ökonomie findet. Die Ausbildung von Verständnis zu einem solchen System beinhaltet eine Beschreibung in Form von Statistiken und schlussendlich mathematischen Gleichungen. Moderne Datenanalyse stellt eine große Menge von Werkzeugen zur Analyse von Komplexität auf verschiedenen Beschreibungsebenen bereit. In diesem Kurs werden statistische Methoden mit einem Schwerpunkt auf dynamischen Systemen diskutiert und eingeübt. Auf der methodischen Seite werden lineare und nichtlineare Ansätze behandelt, inklusive der Standard-Werkzeuge der deskriptiven und schlussfolgernden Statistik, Wavelet Analyse, Nichtparametrische Regression und der Schätzung nichtlinearer Maße wie fraktaler Dimensionen, Entropien und Komplexitätsmaßen. Auf der Modellierungsseite werden deterministische und stochastische Systeme, Chaos, Skalierung und das Entstehen von Komplexität durch Wechselwirkung diskutiert - sowohl für diskrete als auch für ausgedehnte Systeme. Die beiden Ansätze werden durch Systemanalyse jeweils passender Beispiele vereint.
Komplexe Systeme reichen von "harten", physikalischen, wie Klimaphysik, Turbulenz in Fluiden oder Plasmen bis zu so genannten "weichen", wie man sie in der Biologie, der Physik weicher Materie, Soziologie oder Ökonomie findet. Die Ausbildung von Verständnis zu einem solchen System beinhaltet eine Beschreibung in Form von Statistiken und schlussendlich mathematischen Gleichungen. Moderne Datenanalyse stellt eine große Menge von Werkzeugen zur Analyse von Komplexität auf verschiedenen Beschreibungsebenen bereit. In diesem Kurs werden statistische Methoden mit einem Schwerpunkt auf dynamischen Systemen diskutiert und eingeübt. Auf der methodischen Seite werden lineare und nichtlineare Ansätze behandelt, inklusive der Standard-Werkzeuge der deskriptiven und schlussfolgernden Statistik, Wavelet Analyse, Nichtparametrische Regression und der Schätzung nichtlinearer Maße wie fraktaler Dimensionen, Entropien und Komplexitätsmaßen. Auf der Modellierungsseite werden deterministische und stochastische Systeme, Chaos, Skalierung und das Entstehen von Komplexität durch Wechselwirkung diskutiert - sowohl für diskrete als auch für ausgedehnte Systeme. Die beiden Ansätze werden durch Systemanalyse jeweils passender Beispiele vereint.
Komplexe Systeme reichen von "harten", physikalischen, wie Klimaphysik, Turbulenz in Fluiden oder Plasmen bis zu so genannten "weichen", wie man sie in der Biologie, der Physik weicher Materie, Soziologie oder Ökonomie findet. Die Ausbildung von Verständnis zu einem solchen System beinhaltet eine Beschreibung in Form von Statistiken und schlussendlich mathematischen Gleichungen. Moderne Datenanalyse stellt eine große Menge von Werkzeugen zur Analyse von Komplexität auf verschiedenen Beschreibungsebenen bereit. In diesem Kurs werden statistische Methoden mit einem Schwerpunkt auf dynamischen Systemen diskutiert und eingeübt. Auf der methodischen Seite werden lineare und nichtlineare Ansätze behandelt, inklusive der Standard-Werkzeuge der deskriptiven und schlussfolgernden Statistik, Wavelet Analyse, Nichtparametrische Regression und der Schätzung nichtlinearer Maße wie fraktaler Dimensionen, Entropien und Komplexitätsmaßen. Auf der Modellierungsseite werden deterministische und stochastische Systeme, Chaos, Skalierung und das Entstehen von Komplexität durch Wechselwirkung diskutiert - sowohl für diskrete als auch für ausgedehnte Systeme. Die beiden Ansätze werden durch Systemanalyse jeweils passender Beispiele vereint.
Komplexe Systeme reichen von "harten", physikalischen, wie Klimaphysik, Turbulenz in Fluiden oder Plasmen bis zu so genannten "weichen", wie man sie in der Biologie, der Physik weicher Materie, Soziologie oder Ökonomie findet. Die Ausbildung von Verständnis zu einem solchen System beinhaltet eine Beschreibung in Form von Statistiken und schlussendlich mathematischen Gleichungen. Moderne Datenanalyse stellt eine große Menge von Werkzeugen zur Analyse von Komplexität auf verschiedenen Beschreibungsebenen bereit. In diesem Kurs werden statistische Methoden mit einem Schwerpunkt auf dynamischen Systemen diskutiert und eingeübt. Auf der methodischen Seite werden lineare und nichtlineare Ansätze behandelt, inklusive der Standard-Werkzeuge der deskriptiven und schlussfolgernden Statistik, Wavelet Analyse, Nichtparametrische Regression und der Schätzung nichtlinearer Maße wie fraktaler Dimensionen, Entropien und Komplexitätsmaßen. Auf der Modellierungsseite werden deterministische und stochastische Systeme, Chaos, Skalierung und das Entstehen von Komplexität durch Wechselwirkung diskutiert - sowohl für diskrete als auch für ausgedehnte Systeme. Die beiden Ansätze werden durch Systemanalyse jeweils passender Beispiele vereint.