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- attitude (8)
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- biofilm (8)
- biomaterial (8)
- biomineralization (8)
- block copolymer (8)
- bullying (8)
- carbon cycle (8)
- carbon dioxide (8)
- cells (8)
- charge transfer (8)
- chronic kidney disease (8)
- clefts (8)
- climate impacts (8)
- climate variability (8)
- community (8)
- consistency (8)
- crisis (8)
- cytotoxicity (8)
- data integration (8)
- data profiling (8)
- density functional calculations (8)
- digital health (8)
- digital transformation (8)
- dissociative electron attachment (8)
- ecosystems (8)
- efficiency (8)
- electron transfer (8)
- electrospinning (8)
- executive functions (8)
- extreme events (8)
- films (8)
- flow (8)
- food web (8)
- force (8)
- forest management (8)
- fractional Brownian motion (8)
- frequency (8)
- galaxies (8)
- gamma-rays: galaxies (8)
- genetics (8)
- human physical conditioning (8)
- hybridization (8)
- hypertension (8)
- identity (8)
- inclusion (8)
- injury risk (8)
- instability (8)
- insurance (8)
- integration (8)
- intelligence (8)
- international organizations (8)
- isomerization (8)
- isometric muscle action (8)
- land use change (8)
- landscape of fear (8)
- light (8)
- major depressive disorder (8)
- manganese (8)
- mathematical modeling (8)
- mathematische Modellierung (8)
- mechanisms (8)
- mechanobiology (8)
- membrane (8)
- membranes (8)
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- microscopy (8)
- microstructure (8)
- mobility (8)
- morphological processing (8)
- motor control (8)
- nanocomposite (8)
- narcissism (8)
- natural products (8)
- noise (8)
- nuclear lamina (8)
- numerical relativity (8)
- numerical simulation (8)
- outflows (8)
- parliamentary government (8)
- perceptual span (8)
- persistence (8)
- phosphorylation (8)
- plankton (8)
- polarization (8)
- polyelectrolyte (8)
- polyunsaturated fatty acids (8)
- productivity (8)
- pronouns (8)
- public health (8)
- quantum dots (8)
- quasars: general (8)
- reanalysis (8)
- rehabilitation (8)
- representation (8)
- resources (8)
- restoration (8)
- risk perception (8)
- rotation (8)
- sexual scripts (8)
- signal transduction (8)
- site effects (8)
- snow (8)
- social inclusion (8)
- spatial frequencies (8)
- starch metabolism (8)
- stars: activity (8)
- stars: emission-line, Be (8)
- statistics (8)
- surface chemistry (8)
- surface modification (8)
- suspended sediment (8)
- sustainable development (8)
- technology (8)
- time-series (8)
- trends (8)
- ultrafast (8)
- ventral striatum (8)
- vitamin A (8)
- water quality (8)
- 20. Jahrhundert (7)
- 20th century (7)
- ADHD (7)
- Algorithms (7)
- Anisotropy (7)
- Anpassung (7)
- Apoptosis (7)
- Aromaticity (7)
- C. elegans (7)
- Capsella (7)
- Central Europe (7)
- Complex networks (7)
- Connectivity (7)
- Conversation Analysis (7)
- Crustal structure (7)
- Cytotoxicity (7)
- DNA damage (7)
- DNA radiation damage (7)
- Decision-making (7)
- Design Thinking (7)
- Dirac operator (7)
- East African Rift System (7)
- Eutrophication (7)
- Fokus (7)
- Geochemistry (7)
- Global change (7)
- Greenland (7)
- Hertzsprung-Russell and C-M diagrams (7)
- Higher education (7)
- Indian Summer Monsoon (7)
- Information Structure (7)
- Interoception (7)
- Japanese (7)
- Judaism (7)
- K-theory (7)
- Kalman filter (7)
- Klimaänderung (7)
- Kohlenstoff (7)
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- Leguminosae (7)
- LiDAR (7)
- Longitudinal study (7)
- Mekong Delta (7)
- Molecular dynamics (7)
- Molecularly imprinted polymers (7)
- Molybdenum cofactor (7)
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- Morphology (7)
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- Phosphorus (7)
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- Youth (7)
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- acquisition (7)
- adolescent (7)
- aggregation (7)
- air pollution (7)
- allostatic load (7)
- amygdala (7)
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- articulation (7)
- bicameralism (7)
- binaries: eclipsing (7)
- birth weight (7)
- bystander (7)
- cAMP (7)
- calibration (7)
- cardiovascular diseases (7)
- catalogs (7)
- cell adhesion (7)
- cellulose (7)
- charge generation (7)
- chemistry (7)
- chemotaxis (7)
- child (7)
- circadian clock (7)
- circulation (7)
- circumstellar matter (7)
- cities (7)
- climate-change mitigation (7)
- coastal erosion (7)
- coherence (7)
- community ecology (7)
- comparison (7)
- complex systems (7)
- complexes (7)
- control (7)
- convection (7)
- coronary artery disease (7)
- cortisol (7)
- cyber aggression (7)
- defense (7)
- density (7)
- diet (7)
- dietary patterns (7)
- discrepancy principle (7)
- distribution (7)
- disturbance (7)
- duplicate detection (7)
- dust (7)
- ecological modelling (7)
- economy (7)
- ecosystem functioning (7)
- energy (7)
- energy policy (7)
- ensemble Kalman filter (7)
- enzyme (7)
- enzyme catalysis (7)
- experiments (7)
- extinction (7)
- extraction (7)
- extreme rainfall (7)
- fatty acids (7)
- first passage time (7)
- flood (7)
- fluorescence microscopy (7)
- food webs (7)
- function (7)
- functional magnetic resonance imaging (7)
- galaxies: dwarf (7)
- galaxies: starburst (7)
- gender differences (7)
- gene flow (7)
- geochemistry (7)
- geophysics (7)
- globalization (7)
- grain size (7)
- graphene (7)
- heart (7)
- heterogeneous catalysis (7)
- home range (7)
- human behaviour (7)
- human impact (7)
- imaging (7)
- imaging spectroscopy (7)
- immobilization (7)
- inference (7)
- infrared: stars (7)
- insect (7)
- insula (7)
- interoceptive awareness (7)
- isotopes (7)
- jumping (7)
- kinematics (7)
- land-use change (7)
- last glacial maximum (7)
- life history (7)
- lipid metabolism (7)
- low-energy electrons (7)
- malnutrition (7)
- manifolds with singularities (7)
- measurement (7)
- memory retrieval (7)
- metaanalysis (7)
- metabolic networks (7)
- metabolite profiling (7)
- methane (7)
- microbial ecology (7)
- minerals (7)
- mixed methods (7)
- modality (7)
- modern Jewish history (7)
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- natural language processing (7)
- neuroplasticity (7)
- nonergodicity (7)
- nuclear envelope (7)
- numerical simulations (7)
- organic matter (7)
- orthography (7)
- oscillations (7)
- oxygen (7)
- pH (7)
- pain (7)
- palaeoecology (7)
- paleoecology (7)
- parafoveal processing (7)
- parameter estimation (7)
- pathogens (7)
- phase transition (7)
- phase transitions (7)
- photoelectron spectroscopy (7)
- planetary nebulae: general (7)
- planets and satellites: rings (7)
- plant diversity (7)
- plasmonics (7)
- policy (7)
- porous materials (7)
- predator-prey dynamics (7)
- presidential government (7)
- production control (7)
- programming (7)
- pronoun resolution (7)
- propensity score matching (7)
- prosodic boundary cues (7)
- proteasome (7)
- pseudodifferential operators (7)
- public management (7)
- pulsars: general (7)
- quality (7)
- quantification (7)
- recombination (7)
- reflection (7)
- repair (7)
- reproducibility (7)
- residual stress (7)
- retinol (7)
- rheology (7)
- roughness (7)
- secular trend (7)
- seismic hazard (7)
- shape-memory effect (7)
- sharing economy (7)
- silicon (7)
- size (7)
- social rejection (7)
- solar wind (7)
- sorption (7)
- stabile Isotope (7)
- standardization (7)
- stars: late-type (7)
- sunspots (7)
- surfactants (7)
- surveillance (7)
- tVNS (7)
- techniques: image processing (7)
- thermokarst (7)
- time series (7)
- topography (7)
- transfer (7)
- transition (7)
- treeline (7)
- trunk (7)
- uncertainty analysis (7)
- urbanization (7)
- variation (7)
- verification (7)
- visualization (7)
- weather (7)
- wh-in-situ (7)
- wh-questions (7)
- working memory capacity (7)
- yellow flags (7)
- youth sports (7)
- AFM (6)
- Adipositas (6)
- Ageing (6)
- Alaska (6)
- Alps (6)
- Anisotropy effect (6)
- Antibiotikaresistenz (6)
- Aphasie (6)
- Arbeitsgedächtnis (6)
- Arsenolipids (6)
- Assessment (6)
- Atmosphäre (6)
- BMI (6)
- Bakterien (6)
- Balance (6)
- Bayesian data analysis (6)
- Bewegungsökologie (6)
- Bioelectrocatalysis (6)
- Biogenic amine (6)
- Biophysik (6)
- Blockcopolymere (6)
- C-reactive protein (6)
- CO2 (6)
- COVID-19 pandemic (6)
- Caribbean (6)
- Chytridiomycota (6)
- Click chemistry (6)
- Colombia (6)
- Computational modelling (6)
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- Copper (6)
- Data assimilation (6)
- Datenbank (6)
- Deep learning (6)
- Design (6)
- Dezentralisierung (6)
- Digitalisierung (6)
- Disturbance (6)
- Diversity (6)
- Dynamic NMR (6)
- EEG/ERP (6)
- Emotions (6)
- Energy (6)
- Europa (6)
- Flood (6)
- Flood risk (6)
- Fluorescence spectroscopy (6)
- Gammastrahlungsastronomie (6)
- Gene-environment interaction (6)
- Genomics (6)
- Governance (6)
- Groundwater (6)
- H II regions (6)
- HIREC (6)
- Hodge theory (6)
- ISM: kinematics and dynamics (6)
- Immunoassay (6)
- Insurance (6)
- Interaction (6)
- Interest (6)
- Japan (6)
- Künstliche Intelligenz (6)
- Lake Van (6)
- Land use change (6)
- Language acquisition (6)
- Lasers (6)
- Levy flights (6)
- Local Group (6)
- Longitudinal (6)
- Lysiphlebus fabarum (6)
- Magnetismus (6)
- Magnetohydrodynamik (6)
- Mandarin Chinese (6)
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- O-antigen (6)
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- PBPK (6)
- Paläoklimatologie (6)
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- Phenotypic plasticity (6)
- Phonons (6)
- Poecilia mexicana (6)
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- Prunus avium L. (6)
- Pyrenees (6)
- Quasare (6)
- R&D (6)
- Raman (6)
- Reinforcement learning (6)
- Reliability (6)
- Resistance training (6)
- Return to work (6)
- Rheologie (6)
- Rheology (6)
- Ring current effect (6)
- SDS-PAGE (6)
- SWIM (6)
- Schadensmodellierung (6)
- Seesedimente (6)
- Sentinel-1 (6)
- Sexual scripts (6)
- Sexual selection (6)
- Smalltalk (6)
- Soil erosion (6)
- Speech perception (6)
- Sphingosine 1-phosphate (6)
- Stable isotopes (6)
- Sternentwicklung (6)
- Stretch-shortening cycle (6)
- Subduction zone processes (6)
- Svalbard (6)
- Synthesis (6)
- TMS (6)
- TRMM (6)
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- Time reference (6)
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- Toeplitz operators (6)
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- Transformation (6)
- Unsicherheitsanalyse (6)
- Variability (6)
- Vegetation (6)
- Vietnam (6)
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- Water (6)
- West Bohemia (6)
- Westerlies (6)
- Wind erosion (6)
- acid ceramidase (6)
- administration (6)
- admixture (6)
- age of acquisition (6)
- alexithymia (6)
- algorithms (6)
- alignment (6)
- animal movement (6)
- anthropometry (6)
- antioxidants (6)
- attitudes (6)
- bias (6)
- biodegradable polymers (6)
- black holes (6)
- bryophytes (6)
- business processes (6)
- change (6)
- change detection (6)
- chloroplast (6)
- co-limitation (6)
- colonialism (6)
- community effect (6)
- competence (6)
- complexity (6)
- constraints (6)
- contrast (6)
- corruption (6)
- costs (6)
- crown compounds (6)
- crystal-structure (6)
- cyber victimization (6)
- cyber-physical systems (6)
- cytoskeleton (6)
- data (6)
- depressive symptoms (6)
- diabetic nephropathy (6)
- dielectrophoresis (6)
- diffuse radiation (6)
- domestication (6)
- droughts (6)
- dust, extinction (6)
- dyslexia (6)
- early warning (6)
- eclogite (6)
- ecohydrology (6)
- effectiveness (6)
- efficient (6)
- eicosapentaenoic acid (6)
- electrons (6)
- electrostatic interactions (6)
- elementary particles (6)
- energy storage (6)
- engagement (6)
- english (6)
- entropy (6)
- environmental change (6)
- enzymes (6)
- exercise therapy (6)
- extension (6)
- eye movement (6)
- fNIRS (6)
- fabrication (6)
- facilitation (6)
- fertilization (6)
- first passage (6)
- floodplain (6)
- fluorescence correlation spectroscopy (6)
- formal semantics (6)
- galaxies: abundances (6)
- galaxy evolution (6)
- gamma-ray astronomy (6)
- gamma-rays: general (6)
- gas (6)
- gelatin (6)
- general relativity (6)
- genes (6)
- geodynamics (6)
- geology (6)
- givenness (6)
- giving-up density (6)
- global warming (6)
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- gravity (6)
- habitat (6)
- habituation (6)
- heat stress (6)
- heterocycles (6)
- history and philosophy of astronomy (6)
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- hybridization capture (6)
- hydrolysis (6)
- immigration (6)
- impacts (6)
- infancy (6)
- injury (6)
- institutions (6)
- interfaces (6)
- introgression (6)
- invasive species (6)
- kosmische Strahlung (6)
- leadership (6)
- lifespan (6)
- linagliptin (6)
- lithosphere (6)
- macrophytes (6)
- magnetic nanoparticles (6)
- magnetism (6)
- maximal isometric Adaptive Force (6)
- meaning (6)
- mechanism (6)
- media violence (6)
- melt inclusions (6)
- mental simulation (6)
- metabolites (6)
- methods: analytical (6)
- miRNA (6)
- micelles (6)
- microbial communities (6)
- microtubules (6)
- mind wandering (6)
- molecular modeling (6)
- molecular motors (6)
- moment tensor (6)
- multicore architectures (6)
- muscle (6)
- muscle power (6)
- neotectonics (6)
- neurodegeneration (6)
- neutron diffraction (6)
- next generation sequencing (6)
- nucleus (6)
- numerical development (6)
- organic photovoltaics (6)
- organization (6)
- overweight (6)
- p53 (6)
- palaeoclimate (6)
- parameters (6)
- participation (6)
- pattern formation (6)
- perovskite (6)
- perturbation (6)
- phenology (6)
- phonetics (6)
- phosphate (6)
- phylogenetic diversity (6)
- piezoelectricity (6)
- plant (6)
- plants (6)
- plyometric training (6)
- political equality (6)
- pollution (6)
- polyelectrolytes (6)
- polystyrene (6)
- polyzwitterions (6)
- population density (6)
- porosity (6)
- porous carbon (6)
- postural stability (6)
- pregnancy (6)
- presupposition (6)
- probiotics (6)
- process mining (6)
- projections (6)
- protection (6)
- protein-protein interaction (6)
- race (6)
- racism (6)
- radical polymerization (6)
- radiocarbon (6)
- rainfall (6)
- rat (6)
- reciprocal class (6)
- reconstruction (6)
- reduction (6)
- relative index (6)
- religion (6)
- reproduction (6)
- research projects (6)
- retinol-binding protein 4 (6)
- risk factor (6)
- saccades (6)
- salinity gradient (6)
- salivary gland (6)
- scale development (6)
- scattering (6)
- scrambling (6)
- sedaDNA (6)
- sediment transport (6)
- selenium (6)
- self-concept (6)
- self-healing (6)
- self-regulation (6)
- sensor (6)
- silver nanoparticles (6)
- soccer (6)
- social comparison (6)
- socioeconomic status (6)
- sodium (6)
- software engineering (6)
- solar cells (6)
- speciation (6)
- speed (6)
- star formation (6)
- stars: horizontal-branch (6)
- stars: kinematics and dynamics (6)
- stars: magnetic fields (6)
- stimuli-sensitive polymers (6)
- stochastic differential equations (6)
- stroke (6)
- sucrose (6)
- sulfite oxidase (6)
- support vector machine (6)
- surgery (6)
- teacher education (6)
- teaching (6)
- thaliana (6)
- therapist competence (6)
- thermoresponsive polymers (6)
- tomato (6)
- tomography (6)
- tools (6)
- tracking (6)
- trade-offs (6)
- training adaptation (6)
- traits (6)
- transcriptional memory (6)
- transcriptome (6)
- trust (6)
- ultrafast dynamics (6)
- unemployment (6)
- uplift (6)
- user experience (6)
- video analysis (6)
- violence (6)
- visions of democracy (6)
- walking (6)
- water management (6)
- weight loss (6)
- women (6)
- world literature (6)
- zebrafish (6)
- 19. Jahrhundert (5)
- 3D point clouds (5)
- 3D visualization (5)
- AC electrokinetics (5)
- ALAN (5)
- Absorption (5)
- Ackerschmalwand (5)
- African Humid Period (5)
- Afrika (5)
- Aftercare (5)
- Age of acquisition (5)
- Agency (5)
- Air pollution (5)
- Algeria (5)
- Alterung (5)
- Amygdala (5)
- Ancient DNA (5)
- Animal personality (5)
- Antwortmengenprogrammierung (5)
- Arrayseismologie (5)
- Arsenic-containing hydrocarbons (5)
- Asian monsoon (5)
- Asteraceae (5)
- Atiyah-Patodi-Singer theory (5)
- Australien (5)
- Autocorrelation (5)
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- Block copolymers (5)
- Blockcopolymer (5)
- Blood (5)
- Bodenfeuchte (5)
- Body composition (5)
- Boric acid (5)
- Boron exposure (5)
- Bose-Einstein condensation (5)
- Boundary value problems (5)
- Brassicaceae (5)
- Cardiovascular diseases (5)
- Cattle (5)
- Cayley Graph (5)
- Cell polarity (5)
- Chemotaxis (5)
- Child (5)
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- Chloroplast (5)
- Cognitive control (5)
- Cold War (5)
- Community assembly (5)
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- Conservation (5)
- Cost-effectiveness (5)
- Cue-based retrieval (5)
- Cultural diversity (5)
- Cyanobakterien (5)
- Cystic fibrosis (5)
- DRD4 (5)
- Data profiling (5)
- Datenassimilation (5)
- Decision making (5)
- Dexamethasone (5)
- Dictyostelium discoideum (5)
- Duplikaterkennung (5)
- EPR (5)
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- Entwicklung (5)
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- European hare (5)
- Extraction (5)
- Extreme events (5)
- Eye movement (5)
- Feature selection (5)
- Fetal programming (5)
- Fire-bellied toad (5)
- Flow cytometry (5)
- Fluorescence imaging (5)
- Fokker-Planck equation (5)
- Food quality (5)
- Frailty (5)
- Free Group (5)
- Functional ankle instability (5)
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- GIS (5)
- Galaxy: center (5)
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- HVSR (5)
- Habitat fragmentation (5)
- Heart rate variability (5)
- Hebrew (5)
- Heterocycles (5)
- Holding isometric muscle action (5)
- Hypertension (5)
- IAT (5)
- IR-MALDI (5)
- ISM: jets and outflows (5)
- ISM: lines and bands (5)
- ISM: magnetic fields (5)
- Imaging (5)
- Immigration (5)
- Individual-based models (5)
- Induced seismicity (5)
- Information (5)
- Insect (5)
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- Ionosphere (5)
- Islam (5)
- Janus emulsions (5)
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- L2 processing (5)
- LC–MS/MS (5)
- Lactams (5)
- Lactones (5)
- Lakes (5)
- Land-use intensity (5)
- Landslides (5)
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- Röntgenspektroskopie (4)
- SDGs (4)
- SDS PAGE (4)
- SEM (4)
- Salivary gland (4)
- Salmonella (4)
- Salts (4)
- Scale development (4)
- Scrum (4)
- Second World War (4)
- Secondary Education (4)
- Sediment connectivity (4)
- Sedimentology (4)
- Seismic attenuation (4)
- Seismic noise (4)
- Self-control (4)
- Self-efficacy (4)
- Self-employment (4)
- Self-esteem (4)
- Self-paced reading (4)
- Self-regulation (4)
- Semiarid (4)
- Senescence (4)
- Serotonin (4)
- Sexual victimization (4)
- Shrub encroachment (4)
- Sicherheit (4)
- Sick leave (4)
- Simulated patients (4)
- Simulationen (4)
- Software (4)
- Soil hydrology (4)
- Solidago gigantea (4)
- Species distribution modelling (4)
- Sport (4)
- Sprachverständnis (4)
- Standardized patients (4)
- Staphylococcus aureus (4)
- Start-Up Subsidies (4)
- Start-up subsidies (4)
- Statistical methods (4)
- Sterne (4)
- Sternentstehung (4)
- Stickstoff (4)
- Storytelling (4)
- Strategic foresight (4)
- Structural geology (4)
- Structure elucidation (4)
- Städte (4)
- Sun (4)
- Supervision (4)
- Surface roughness (4)
- Survival (4)
- Swedish (4)
- System (4)
- Systems biology (4)
- TEM (4)
- TSNMRS (4)
- Team sports (4)
- Telerehabilitation (4)
- Temperatur (4)
- Tenside (4)
- Thermal effects (4)
- Thermochronology (4)
- Thermoresponsive (4)
- ToF-SIMS (4)
- Trace elements (4)
- Transfer function (4)
- Transkriptionsfaktor (4)
- Transkriptomik (4)
- Triassic (4)
- Tropical forest (4)
- Tso Moriri Lake (4)
- Turkish-German bilingualism (4)
- Türkisch (4)
- UAV (4)
- Ukraine (4)
- Ultrasound (4)
- Uncertainties (4)
- Underspecification (4)
- VIIRS DNB (4)
- Van Allen Probes (4)
- Variabilität (4)
- Verification (4)
- Verwaltung (4)
- Verwaltungsreform (4)
- Virtuelle Maschinen (4)
- Virus (4)
- WA-PLS (4)
- Weathering (4)
- Weight (4)
- Weight bias internalization (4)
- West Antarctica (4)
- Wissensmanagement (4)
- Work ability (4)
- X-ray emission spectroscopy (4)
- X-ray scattering (4)
- X-rays (4)
- XRF (4)
- Xanthomonas (4)
- Zaremba problem (4)
- accretion (4)
- accretion, accretion disks (4)
- accuracy (4)
- achilles tendinopathy (4)
- actin (4)
- action language (4)
- action processing (4)
- action words (4)
- actuation (4)
- adaptive force (4)
- additive particles (4)
- adherence (4)
- adipogenesis (4)
- adiponectin (4)
- adjectives (4)
- administrative reform (4)
- advanced dynamic flow (4)
- aerosol size distribution (4)
- affective (4)
- agent-based model (4)
- agility (4)
- agreement attraction (4)
- aldehyde oxidase (4)
- allelopathy (4)
- alternatives (4)
- anaphors (4)
- antifouling (4)
- antilocality (4)
- app (4)
- aptamers (4)
- aquatic ecosystems (4)
- aqueous-solution (4)
- arabidopsis (4)
- arabidopsis-thaliana (4)
- architecture (4)
- argumentation (4)
- arsenolipids present (4)
- astronomy (4)
- astrophysical plasmas (4)
- athletes (4)
- attachment (4)
- augmented reality (4)
- automatic evaluation (4)
- automatic evaluations (4)
- automation (4)
- autonomy (4)
- autophagy (4)
- balance training (4)
- beliefs (4)
- biodiversity exploratories (4)
- bioelectrocatalysis (4)
- biogeochemistry (4)
- biological age (4)
- biological invasions (4)
- biomarkers (4)
- bis-MGD (4)
- black hole physics (4)
- body composition (4)
- body image (4)
- branching (4)
- brushes (4)
- brushite (4)
- buildings (4)
- bulk heterojunction (4)
- business (4)
- business model (4)
- capacity (4)
- capacity building (4)
- carbon isotopes (4)
- carbon nitrides (4)
- catchments (4)
- categories (4)
- cell cycle (4)
- cell wall (4)
- change management (4)
- citizenship (4)
- cleft (4)
- climate change impacts (4)
- climate extremes (4)
- climate warming (4)
- clinical sample (4)
- clone (4)
- cluster analysis (4)
- co-occurrence analysis (4)
- cod-liver (4)
- codon usage (4)
- coefficient (4)
- coevolution (4)
- cognitive enhancement (4)
- cognitive modeling (4)
- collaborative consumption (4)
- collagen (4)
- colloids (4)
- colonization (4)
- color (4)
- combat sports (4)
- common vole (4)
- community structure (4)
- compliance (4)
- composites (4)
- computer games (4)
- computer science education (4)
- computer-based training (4)
- concepts (4)
- conceptualization (4)
- conduct problems (4)
- conductivity (4)
- confocal microscopy (4)
- conjugated polymers (4)
- content-addressable memory (4)
- contracts (4)
- conversational agents (4)
- convolutional neural network (4)
- coping strategies (4)
- copper(II) (4)
- core (4)
- coreference (4)
- coronary heart disease (4)
- corrosion (4)
- counting (4)
- covariance (4)
- creep (4)
- crop production (4)
- cross-cultural comparison (4)
- crosslinking (4)
- cyberbullying victimization (4)
- cyclic voltammetry (4)
- cylindrospermopsin (4)
- cystic fibrosis (4)
- cytochrome c (4)
- data mining (4)
- data preparation (4)
- data quality (4)
- decarbonization (4)
- deformation (4)
- degenerative disc disease (4)
- demography (4)
- deposition (4)
- design (4)
- deutsch-jüdische Geschichte (4)
- dictator game (4)
- differential operators (4)
- differentiation (4)
- digital (4)
- digital platforms (4)
- disability (4)
- discourse production (4)
- distributed systems (4)
- diversification (4)
- dog (4)
- dropout (4)
- drugs (4)
- dual-process (4)
- dyadic coping (4)
- dye removal (4)
- dynamic (4)
- dynamical models (4)
- dynamical systems (4)
- eating behavior (4)
- eco-evolutionary experience (4)
- edge effect (4)
- effect (4)
- electron paramagnetic resonance (4)
- electron-transfer (4)
- electrostatics (4)
- elliptic operator (4)
- emissions (4)
- emotional expression (4)
- emulsion (4)
- endophytes (4)
- enhancement (4)
- entanglement (4)
- entrepreneurship education (4)
- environmental filtering (4)
- environmental policy (4)
- errata, addenda (4)
- ethnicity (4)
- eutrophication (4)
- evaluative study (4)
- evaporites (4)
- event-related brain potentials (4)
- evolutionary history (4)
- exercise intensity (4)
- experimental design (4)
- exploratory-behavior (4)
- eye-movement monitoring (4)
- face perception (4)
- family (4)
- fatty acid (4)
- fatty acid metabolism (4)
- fatty-acids (4)
- fault (4)
- feature selection (4)
- fence ecology (4)
- ferroelectric polymers (4)
- fiction (4)
- financial crisis (4)
- financial institutions (4)
- finger counting (4)
- fire (4)
- first language acquisition (4)
- first-passage (4)
- fixation durations (4)
- floral scent (4)
- flower development (4)
- fluctuating light (4)
- fluctuations (4)
- fluid inclusions (4)
- fluorescent dyes (4)
- formal verification (4)
- fractional dynamics (4)
- framework (4)
- frustration (4)
- functional response (4)
- fundamental frequency (4)
- fungi (4)
- galaxies: star formation (4)
- garden-path effect (4)
- gaze-contingent displays (4)
- gene regulation (4)
- gene regulatory networks (4)
- genealogy (4)
- genetic diversity (4)
- genome-wide association (4)
- geomorphometry (4)
- geothermal energy (4)
- geovisualization (4)
- global jets (4)
- global positioning system (4)
- global sensitivity analysis (4)
- glomerular filtration rate (4)
- glucose oxidation (4)
- glucosinolates (4)
- glutathione (4)
- graph theory (4)
- graph transformation (4)
- graph transformation systems (4)
- graphs (4)
- ground reaction force (4)
- group field theory (4)
- gut microbiota (4)
- handgrip strength (4)
- handwriting (4)
- hazard (4)
- health care (4)
- healthcare (4)
- heart failure (4)
- heat (4)
- helical magnetic fields (4)
- hemocompatibility (4)
- heritage language (4)
- heterostyly (4)
- heuristics (4)
- high-intensity interval training (4)
- historiography (4)
- holding capacity (4)
- holding isometric muscle action (HIMA) (4)
- honey bee (4)
- hospitals (4)
- human capital (4)
- human-computer interaction (4)
- hybrid (4)
- hydrological models (4)
- hyporheic zone (4)
- immune system (4)
- immunology (4)
- implicit attitude (4)
- impulsivity (4)
- in vitro (4)
- individual (4)
- inertial measurement unit (4)
- inorganic perovskites (4)
- insulin signaling (4)
- interactional linguistics (4)
- interception (4)
- interest (4)
- interface (4)
- intergovernmental relations (4)
- international organisations (4)
- intersectionality (4)
- intrusion detection (4)
- ionic conductivity (4)
- ionic strength (4)
- joint Simon effect (4)
- joint action (4)
- karst (4)
- kidney transplantation (4)
- knickpoint (4)
- knowledge (4)
- komplexe Netzwerke (4)
- künstliche Intelligenz (4)
- lactate (4)
- land-use intensity (4)
- language contact (4)
- large-scale structure of Universe (4)
- laser pulses (4)
- laterality (4)
- law (4)
- left periphery (4)
- lexical access (4)
- lexicon (4)
- lichens (4)
- life satisfaction (4)
- lifestyle (4)
- light variability (4)
- line: identification (4)
- linear hypersubstitution (4)
- lipopolysaccharide (4)
- loading rate (4)
- locomotion (4)
- locus coeruleus (4)
- locus of control (4)
- long-distance dispersal (4)
- long-term effects (4)
- low-back-pain (4)
- lower critical solution temperature (4)
- machine (4)
- macrocycles (4)
- macrophages (4)
- magnetostriction (4)
- magnetotellurics (4)
- mammals (4)
- manifold with singularities (4)
- mass (4)
- mathematics instruction (4)
- meadow (4)
- measurement invariance (4)
- mechanical properties (4)
- mechanical tendinous oscillations (4)
- media (4)
- memory effects (4)
- mental disorders (4)
- mesenchymal stem cells (4)
- mesoporous materials (4)
- metabolic engineering (4)
- metabolic regulation (4)
- metadata (4)
- metaphor (4)
- meteorological drought (4)
- methyl orange (4)
- methylene blue (4)
- methylmercury (4)
- micro-CT (4)
- microRNA (4)
- microgels (4)
- mid-temperature transition (4)
- mild cognitive impairment (4)
- mitochondrial DNA (4)
- mixtures (4)
- mobile links (4)
- model-driven engineering (4)
- modular production (4)
- molecular evolution (4)
- molecules (4)
- monoclonal antibody (4)
- morphogenesis (4)
- muscle oxygen saturation (4)
- museum specimens (4)
- music information retrieval (4)
- myocardial infarction (4)
- n-alkanes (4)
- nachhaltige Chemie (4)
- nanolenses (4)
- nanotriangles (4)
- narrative (4)
- nested graph conditions (4)
- network reconstruction (4)
- neurodegenerative diseases (4)
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- neutrinos (4)
- new species (4)
- new technology (4)
- next generation sequencing (NGS) (4)
- non-alcoholic fatty liver disease (4)
- non-linear dynamics (4)
- non-native speakers (4)
- non-photorealistic rendering (4)
- nonlinear operator (4)
- numerical (4)
- numerical model (4)
- ocean (4)
- ocean acidification (4)
- ocean color remote sensing (4)
- online (4)
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- operating systems (4)
- optimal foraging (4)
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- optimism (4)
- optimization (4)
- organ size (4)
- organic carbon (4)
- organic chemistry (4)
- osmotic-pressure (4)
- osteoblast (4)
- other-race effect (4)
- outcomes (4)
- paleoaltimetry (4)
- paleoclimatology (4)
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- paleolimnology (4)
- palladium (4)
- parafoveal-on-foveal effect (4)
- parental mediation (4)
- part 1 (4)
- partial clone (4)
- partial least squares (4)
- particle acceleration (4)
- pathway (4)
- people (4)
- permafrost thaw (4)
- persulfide (4)
- phase (4)
- phase oscillators (4)
- phenols (4)
- phenotyping (4)
- photoelectron (4)
- photofragmentation (4)
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- photoisomerization (4)
- photon density wave spectroscopy (4)
- photooxygenation (4)
- phototaxis (4)
- photovoltaic devices (4)
- physical performance (4)
- physics education (4)
- physiological consequences (4)
- phytolith (4)
- picture naming (4)
- picture-word interference (4)
- planetary rings (4)
- planets and satellites: atmospheres (4)
- plant development (4)
- plant growth (4)
- plant population and community dynamics (4)
- plasma membrane (4)
- plasma-membrane (4)
- platelets (4)
- playa (4)
- plume (4)
- point process (4)
- policy-making (4)
- politeness (4)
- poly(ethylene glycol) (4)
- polyadenylation (4)
- polyelectrolyte adsorption (4)
- polymer chemistry (4)
- polypeptide (4)
- polypropylene (4)
- polysemy (4)
- population structure (4)
- populations (4)
- pornography (4)
- poröse Materialien (4)
- potato (4)
- pragmatics (4)
- pre-school (4)
- preactivation (4)
- precuneus (4)
- preference assessment (4)
- pressure (4)
- principal component analysis (4)
- proactive aggression (4)
- proactivity (4)
- probabilistic timed systems (4)
- problem-solving (4)
- process (4)
- process analytical technology (4)
- production (4)
- properties (4)
- protein engineering (4)
- protein modification (4)
- protein-protein interactions (4)
- proteinuria (4)
- proteome (4)
- psychological distress (4)
- psychosocial moderators (4)
- pubertal timing (4)
- public policy (4)
- qualitative Analyse (4)
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- quality assurance (4)
- quantitative Analyse (4)
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- questionnaire (4)
- quorum sensing (4)
- radicals (4)
- rampage (4)
- random walk (4)
- random walks (4)
- randomized controlled trial (4)
- rape myth acceptance (4)
- rare earth elements (4)
- rate of perceived exertion (4)
- reactive aggression (4)
- recollection (4)
- recombinant inbred line (4)
- recurrence (4)
- recurrence plot (4)
- redox state (4)
- reference (4)
- reforms (4)
- regime shift (4)
- regression (4)
- regularity (4)
- reionization (4)
- relatedness (4)
- remagnetization (4)
- replication (4)
- reproductive strategies (4)
- reproductive success (4)
- research (4)
- research school (4)
- resistin (4)
- resonance energy transfer (4)
- reward anticipation (4)
- risk perceptions (4)
- risk reduction (4)
- river incision (4)
- rivers (4)
- robustness (4)
- rolling averages (4)
- root traits (4)
- rotifer (4)
- run time analysis (4)
- runners (4)
- rural (4)
- salivary alpha-amylase (4)
- salt (4)
- salt pan (4)
- sanctions (4)
- scaffolding (4)
- scenario (4)
- scenario analysis (4)
- scenarios (4)
- school adjustment (4)
- school children (4)
- school mathematics (4)
- school shooting (4)
- screening (4)
- sea level (4)
- secondary school (4)
- sedimentology (4)
- self-control (4)
- self-evaluation (4)
- self-objectification (4)
- self-sovereign identity (4)
- selfing syndrome (4)
- sequence (4)
- sexual assault (4)
- sexual coercion (4)
- sexual selection (4)
- sexual victimization (4)
- sexualization (4)
- shape (4)
- shape memory (4)
- shape-memory polymers (4)
- shrub encroachment (4)
- signal propagation (4)
- similarity measures (4)
- single nucleotide polymorphism (4)
- skill (4)
- skin (4)
- small mammals (4)
- smart contracts (4)
- social acceptance (4)
- social capital (4)
- social status (4)
- software (4)
- software development (4)
- soils (4)
- space (4)
- space use (4)
- spatial (4)
- spatially explicit model (4)
- species distribution model (4)
- species distribution modelling (4)
- specific root length (4)
- spectral analysis (4)
- speech segmentation (4)
- spelling (4)
- sports (4)
- stakeholder participation (4)
- star product (4)
- stars: black holes (4)
- stars: chemically peculiar (4)
- stars: formation (4)
- stars: low-mass (4)
- stars: oscillations (4)
- starspots (4)
- start-up subsidies (4)
- states (4)
- statistical seismology (4)
- stellar physics (4)
- sterols (4)
- stochastic process (4)
- storage (4)
- strain localization (4)
- stress response (4)
- stress tolerance (4)
- subdiffusion (4)
- subsidence (4)
- sucrose responsiveness (4)
- summer monsoon (4)
- supergene (4)
- supernova remnants (4)
- supervisor support (4)
- surface-enhanced Raman scattering (4)
- survey (4)
- sustainable chemistry (4)
- symbiosis (4)
- synchrotron radiation (4)
- synthetische Biologie (4)
- tandem solar cells (4)
- teacher (4)
- teacher beliefs (4)
- teacher learning (4)
- telemedicine (4)
- thermoresponsiv (4)
- thiouracil (4)
- tocopherols (4)
- trade (4)
- trajectories (4)
- transcutaneous vagus nerve stimulation (4)
- transparency (4)
- treatment (4)
- trustworthiness (4)
- tundra (4)
- typology (4)
- ultrafast x-ray diffraction (4)
- ungulate (4)
- usability (4)
- value creation (4)
- vascular plants (4)
- verbs (4)
- vertical coupling (4)
- veterinary cordon fence (4)
- virus (4)
- virus infection (4)
- viscosity (4)
- visible-light (4)
- visual word recognition (4)
- vocabulary (4)
- voice (4)
- vowels (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)
- web application (4)
- weight (4)
- weighted moving averages (4)
- wettability (4)
- wh-movement (4)
- willingness to intervene (4)
- working memory updating (4)
- workplace (4)
- xanthine dehydrogenase (4)
- young adults (4)
- zebularine (4)
- 'eta' invariant (3)
- 1799-1804 (3)
- 2D (3)
- 2D perovskites (3)
- 2nd-language grammar (3)
- 3D (3)
- 3D Point Clouds (3)
- 3D city models (3)
- 3D geovisualization (3)
- 3D-Visualisierung (3)
- 4-nitrophenol (3)
- 5-methoxycarbonylmethyl-2-thiouridine (3)
- A-bar-movement (3)
- ABCB7 (3)
- AGN (3)
- ASIC (3)
- AUD (3)
- Abandonment (3)
- Abbau (3)
- Acacia mellifera (3)
- Academic achievement (3)
- Academic self-concept (3)
- Acer pseudoplatanus (3)
- Achilles and patellar tendon (3)
- Achilles tendon (3)
- Acquisition (3)
- Action processing (3)
- Active tectonics (3)
- Acute coronary syndrome (3)
- Adam Smith (3)
- Additive manufacturing (3)
- Adverbial Quantification (3)
- Aerosol (3)
- Aerosole (3)
- Aesthetics (3)
- Affective Computing (3)
- African indigenous vegetables (3)
- Agrammatic aphasia (3)
- Agricultural landscape (3)
- Alborz Mountains (3)
- Aldehyde oxidase (3)
- Aldehyde oxidoreductase (3)
- Aleatory variability (3)
- Algorithmen (3)
- Alkylpyridinium salts (3)
- Alpine Fault (3)
- Aluminum alloys (3)
- Alzheimer (3)
- Ambiguity (3)
- Amides (3)
- Amphibia (3)
- Amplicon sequencing (3)
- Ancient forest (3)
- Ankle injury (3)
- Anomalous diffusion (3)
- Anti-doping guideline (3)
- Anti-doping program (3)
- Antibiotic resistance (3)
- Antibiotics (3)
- Antifouling (3)
- Aphis fabae (3)
- Approximate Bayesian Computation (3)
- Arabica coffee beans (3)
- Aral Sea (3)
- Arbeitslosigkeit (3)
- Arctic Ocean (3)
- Arctic haze (3)
- Arctic tundra (3)
- Array Seismology (3)
- Array seismology (3)
- Arsenic (3)
- Artificial intelligence (3)
- Asian American (3)
- Asparagales (3)
- Asplanchna brightwellii (3)
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- Astrophysics (3)
- Atiyah-Bott condition (3)
- Atiyah-Bott obstruction (3)
- Atlantic-Ocean (3)
- Atmosphere (3)
- Attitude (3)
- Auger electron spectroscopy (3)
- August 2002 flood (3)
- Auxin transport (3)
- Außenpolitik (3)
- Azobenzene (3)
- Azobenzene containing cationic surfactants (3)
- BDNF (3)
- BIAT (3)
- BIM (3)
- BL Lacertae objects: individual: Mrk 421 (3)
- BL Lacertae objects: individual: PKS 2155-304 (3)
- Bacteriophage (3)
- Barents Sea (3)
- Base pairing (3)
- Baseline shift (3)
- Bayesian estimation (3)
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- Behavior (3)
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- Birch reduction (3)
- Birth weight (3)
- Blickbewegungsmessung (3)
- Blockchains (3)
- Bolboschoenus maritimus (3)
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- Business Process Management (3)
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- Calorimetry (3)
- Cambodia (3)
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- Cardiovascular disease (3)
- Central Chile (3)
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- Chromatin (3)
- Chronic back pain (3)
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- Classical Reception (3)
- Classical reception (3)
- Climate change adaptation (3)
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- Climate reconstruction (3)
- Cloud computing (3)
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- policy analysis (3)
- policy evaluation (3)
- political ideology (3)
- poly(A) polymerase (3)
- poly(N-isopropylacrylamide) (3)
- poly(ether imide) (3)
- polyesters (3)
- polyglycerol (3)
- polymer solar cells (3)
- polymersomes (3)
- polymorphism (3)
- polysulfobetaine (3)
- population growth rate (3)
- possessives (3)
- post-natal (3)
- potassium channel (3)
- poverty (3)
- power spectral analysis (3)
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- pp-wave solutions (3)
- pragmaticalisation (3)
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- pre-natal (3)
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- precaution (3)
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- predation risk (3)
- predator-prey (3)
- predator-prey model (3)
- prediction models (3)
- preference (3)
- prefixes (3)
- preprocessing (3)
- pressures (3)
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- primary school children (3)
- prior knowledge (3)
- privatization (3)
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- probability (3)
- probability density function (3)
- probes (3)
- process modeling (3)
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- proliferation (3)
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- protein binding (3)
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- protein search (3)
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- proteomic analysis (3)
- protonation (3)
- prototype-willingness-model (3)
- pseudo-differential boundary value problems (3)
- pseudo-differential operators (3)
- psycho-oncology (3)
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- puberty (3)
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- quantitative research (3)
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- questions (3)
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- reactance (3)
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- reading comprehension (3)
- real options (3)
- real-time (3)
- rearrangement (3)
- reception (3)
- reciprocal processes (3)
- recommendations (3)
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- red meat (3)
- redox (3)
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- refinement (3)
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- relationships (3)
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- requirements (3)
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- residue (3)
- resolution (3)
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- return to work (3)
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- reward (3)
- rhizosphere (3)
- rifting (3)
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- river (3)
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- robbery (3)
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- sACC (3)
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- scalability (3)
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- science (3)
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- seawater (3)
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- semantic (3)
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- separation (3)
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- shallow structure hypothesis (3)
- shape-memory polymer (3)
- short-read mapping (3)
- sibilant (3)
- sick leave (3)
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- signalling (3)
- silica (3)
- similarity (3)
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- simulation model (3)
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- singularity (3)
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- size distribution (3)
- skeletal muscle (3)
- skeletal robustness (3)
- skew Brownian motion (3)
- smart materials (3)
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- species assembly (3)
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- sphingomyelin (3)
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- spin (3)
- starch granule initiation (3)
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- starch synthase (3)
- stars: (3)
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- stars: distances (3)
- stars: individual (WR 6) (3)
- stars: pre-main sequence (3)
- statins (3)
- statistical (3)
- statistical methods (3)
- stellar populations (3)
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- stereoselectivity (3)
- stereotypes (3)
- stochastic bridge (3)
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- synchronization transition (3)
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- syrphids (3)
- tablet (3)
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- talk-in-interaction (3)
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- task (3)
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- testing (3)
- tetrabromidocuprate(II) (3)
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- theorem (3)
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- ) (2)
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- 1 (2)
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- 11-mercaptoundecanoic acid (2)
- 1D (2)
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- 2-Azaspiro[4.5]deca-1-ones (2)
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- 31C20 (2)
- 35B09 (2)
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- 39A12 (primary) (2)
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- 47A52 (2)
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- 65R20 (2)
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- 78A46 (2)
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- R (2)
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- RGB-D cameras (2)
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- RUNX2 (2)
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- Romania (2)
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- Rossby waves (2)
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- Running (2)
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- Rural health (2)
- Russisch (2)
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- Röntgenstrahlung (2)
- S-XRF (2)
- SAMT (2)
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- SEIRA spectroelectrochemistry (2)
- SEPE (2)
- SERS enhancement factor (2)
- SFON (2)
- SHG (2)
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- SIO₂ (2)
- SLA (2)
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- SPB (2)
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- SRT (2)
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- STG decomposition (2)
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- SUB1A (2)
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- Savannas (2)
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- Scenario (2)
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- Scene perception (2)
- Schaum (2)
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- Sediment Flux (2)
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- Sediments (2)
- Sedimenttransport (2)
- Seed mass (2)
- Seesediment (2)
- Seismic interferometry (2)
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- Seismotectonic segmentation (2)
- Seismotectonics (2)
- Seitenverschiebung (2)
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- Selection (2)
- Selection vs. age-class forests (2)
- Selektion (2)
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- Self-concept (2)
- Self-harm (2)
- Self-organization (2)
- Self-reflection (2)
- Semantic classification task (2)
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- Sensitivitätsanalyse (2)
- Sensor (2)
- Sensor fusion (2)
- Sensory perception (2)
- Sentence-picture matching (2)
- Sentinel 2 (2)
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- Sequence analysis (2)
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- Sequenzierung der nächsten Generation (2)
- Serine cycle (2)
- Serum (2)
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- Service-Orientierte Architekturen (2)
- Service-oriented computing (2)
- Sesia Zone (2)
- Sexual Selection (2)
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- Sexual dimorphism (2)
- Sexualization (2)
- Shadowgraphy (2)
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- Shape-memory effect (2)
- Shape-memory polymer (2)
- Shear Zone (2)
- Shigella flexneri (2)
- Shockley-Queisser model (2)
- Shocks (2)
- Shona (2)
- Short‐term effect (2)
- Shotgun sequencing (2)
- Shoulder (2)
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- Signal detection theory (2)
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- Siwaliks (2)
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- Skeletal joints (2)
- Skeletal muscle cells (2)
- Skin (2)
- Skin nanocarrier (2)
- Skin penetration (2)
- Slab break-off (2)
- Slip Distribution (2)
- Slope exposure (2)
- Slumming (2)
- Small (2)
- Small Aral Sea (2)
- Small for gestational age (2)
- Small mammals (2)
- Smart micro-grids (2)
- Smoking (2)
- Smpd1 (2)
- Snow Cover Extent (SCE) (2)
- Sobo-Sise Island (2)
- Social cognition (2)
- Social cues (2)
- Social functioning (2)
- Social housing innovation (2)
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- Social origin (2)
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- Socioeconomic scenarios (2)
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- Sodium bicarbonate (2)
- Softwarevisualisierung (2)
- Soil fertility (2)
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- Soil heterogeneity (2)
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- Sol-Gel (2)
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- Solid Earth sciences (2)
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- Solvothermal synthesis (2)
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- Sonne (2)
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- South American Monsoon System (2)
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- South-Eastern Africa (2)
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- Sozialkapital (2)
- Space geodetic surveys (2)
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- Spanish modal adverbs (2)
- Spanish verbs of cognitive attitude (2)
- Spatial analysis (2)
- Spatial autocorrelation (2)
- Spatial bias (2)
- Spatial cognition (2)
- Spatial distribution (2)
- Spatial-numerical associations (2)
- Species co-existence (2)
- Species complex (2)
- Species distribution models (2)
- Species loss (2)
- Species-Diversity (2)
- Specific entropy (2)
- Specific wood density (2)
- Spectral analysis (2)
- Spectrophotometry (2)
- Speech Motor Control (2)
- Speech Rhythm and Rhythmic Analysis (2)
- Speech production (2)
- Speleothems (2)
- Spin Geometry (2)
- Spin probes (2)
- Spitsbergen (2)
- Spitzbergen (2)
- Splicing (2)
- Sport medicine (2)
- Sport-specific performance (2)
- Sports injury (2)
- Sputum (2)
- Sri Lanka (2)
- Staatsbürgerschaft (2)
- Stable carbon isotope (2)
- Standard Indonesian (2)
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- Staphylococcus aureus (2)
- Starch (2)
- Starkregen (2)
- State Machine (2)
- State and trait measurement (2)
- Statistical Physics (2)
- Statistical inverse problem (2)
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- Statistik (2)
- Steady-state balance (2)
- Stellar evolution (2)
- Stemflow (2)
- Stereochemistry (2)
- Steric effect (2)
- Sternatmosphären (2)
- Sternphysik (2)
- Sterols (2)
- Stochastik (2)
- Stochastische Resonanz (2)
- Stochastischer Prozess (2)
- Strain (2)
- Strain measurement (2)
- Strategic growth adjustment (2)
- Stress levels (2)
- Stress pattern (2)
- Streuung (2)
- Strike-slip faults (2)
- Strong-motion (2)
- Stroop effect (2)
- Structural equation modeling (2)
- Structure-from-motion (2)
- Structuring (2)
- Strukturbildung (2)
- Student motivation (2)
- Sturm-Liouville problem (2)
- Style modification (2)
- Störungen (2)
- Subarctic North Pacific (2)
- Subject-verb agreement (2)
- Subjective well-being (2)
- Submarine permafrost (2)
- Submariner Permafrost (2)
- Subsampling (2)
- Subsea permafrost (2)
- Subsurface biosphere (2)
- Succession (2)
- Sulfate (2)
- Sulfite oxidase (2)
- Sulphoxide (2)
- Sun: UV radiation (2)
- Sun: filaments (2)
- Sun: heliosphere (2)
- Sun: magnetic topology (2)
- Sun: sunspots (2)
- Sundaland (2)
- Supernatural (2)
- Supernova remnants (2)
- Supernovae (2)
- Supernovaüberrest (2)
- Superoxide (2)
- Support (2)
- Supraleiter (2)
- Supramolecular chemistry (2)
- Surface (2)
- Surface composition (2)
- Surface exudates (2)
- Surface functionalization (2)
- Surface relief grating (2)
- Surface treatment (2)
- Surgical and invasive medical procedures (2)
- Surrogate Data (2)
- Survey Research Methods (2)
- Sus scrofa (2)
- Sustainable (2)
- Sustainable development (2)
- Sway (2)
- Swimming performance (2)
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- To learners in which of the following categories does your work apply (2)
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- chaotic neural dynamics (2)
- chaperone (2)
- chaperones (2)
- charge carrier recombination (2)
- charge localisation (2)
- charge transfers (2)
- charge-carrier transport (2)
- chemical sensors (2)
- chemical weathering (2)
- chemical-mechanical interaction (2)
- chemo-toxicity (2)
- chemoradiation therapy (2)
- chemostat experiments (2)
- chemotaxonomy (2)
- child abuse (2)
- child asylum-seekers (2)
- child second language acquisition (2)
- childcare (2)
- childhood abuse (2)
- childhood obesity (2)
- chimera (2)
- chimeric transcription factors (2)
- chiral recognition (2)
- chlamydomonas (2)
- chlorophyll (2)
- chlorophyll a (2)
- cholinesterase inhibitors (2)
- chromatin regulation (2)
- chromoionophore (2)
- chronic fatigue (2)
Institut
- Institut für Physik und Astronomie (4885)
- Institut für Biochemie und Biologie (4617)
- Institut für Geowissenschaften (3229)
- Institut für Chemie (2882)
- Institut für Mathematik (1856)
- Department Psychologie (1469)
- Institut für Ernährungswissenschaft (1015)
- Department Linguistik (995)
- Wirtschaftswissenschaften (856)
- Institut für Informatik und Computational Science (834)
Combined with measurements made by very-long-baseline interferometry, the observations of fast TeV gamma-ray flares probe the structure and emission mechanism of blazar jets. However, only a handful of such flares have been detected to date, and only within the last few years have these flares been observed from lower-frequency-peaked BL. Lac objects and flat-spectrum radio quasars. We report on a fast TeV gamma-ray flare from the blazar BL. Lacertae observed by the Very Energetic Radiation Imaging Telescope Array System (VERITAS). with a rise time of similar to 2.3 hr and a decay time of similar to 36 min. The peak flux above 200 GeV is (4.2 +/- 0.6) x 10(-6) photon m(-2) s(-1) measured with a 4-minute-binned light curve, corresponding to similar to 180% of the flux that is observed from the Crab Nebula above the same energy threshold. Variability contemporaneous with the TeV gamma-ray flare was observed in GeV gamma-ray, X-ray, and optical flux, as well as in optical and radio polarization. Additionally, a possible moving emission feature with superluminal apparent velocity was identified in Very Long Baseline Array observations at 43 GHz, potentially passing the radio core of the jet around the time of the gamma-ray flare. We discuss the constraints on the size, Lorentz factor, and location of the emitting region of the flare, and the interpretations with several theoretical models that invoke relativistic plasma passing stationary shocks.
We report on observations of the pulsar/Be star binary system PSR J2032+4127/MT91 213 in the energy range between 100 GeV and 20 TeV with the Very Energetic Radiation Imaging Telescope Array and Major Atmospheric Gamma Imaging Cherenkov telescope arrays. The binary orbit has a period of approximately 50 years, with the most recent periastron occurring on 2017 November 13. Our observations span from 18 months prior to periastron to one month after. A new point-like gamma-ray source is detected, coincident with the location of PSR J2032+4127/MT91 213. The gamma-ray light curve and spectrum are well characterized over the periastron passage. The flux is variable over at least an order of magnitude, peaking at periastron, thus providing a firm association of the TeV source with the pulsar/Be star system. Observations prior to periastron show a cutoff in the spectrum at an energy around 0.5 TeV. This result adds a new member to the small population of known TeV binaries, and it identifies only the second source of this class in which the nature and properties of the compact object are firmly established. We compare the gamma-ray results with the light curve measured with the X-ray Telescope on board the Neil Gehrels Swift Observatory and with the predictions of recent theoretical models of the system. We conclude that significant revision of the models is required to explain the details of the emission that we have observed, and we discuss the relationship between the binary system and the overlapping steady extended source, TeV J2032+4130.
This case study evaluates the suitability of radar-based quantitative precipitation estimates (QPEs) for the simulation of streamflow in the Marikina River Basin (MRB), the Philippines. Hourly radar-based QPEs were produced from reflectivity that had been observed by an S-band radar located about 90 km from the MRB. Radar data processing and precipitation estimation were carried out using the open source library wradlib. To assess the added value of the radar-based QPE, we used spatially interpolated rain gauge observations (gauge-only (GO) product) as a benchmark. Rain gauge observations were also used to quantify rainfall estimation errors at the point scale. At the point scale, the radar-based QPE outperformed the GO product in 2012, while for 2013, the performance was similar. For both periods, estimation errors substantially increased from daily to the hourly accumulation intervals. Despite this fact, both rainfall estimation methods allowed for a good representation of observed streamflow when used to force a hydrological simulation model of the MRB. Furthermore, the results of the hydrological simulation were consistent with rainfall verification at the point scale: the radar-based QPE performed better than the GO product in 2012, and equivalently in 2013. Altogether, we could demonstrate that, in terms of streamflow simulation, the radar-based QPE can perform as good as or even better than the GO product - even for a basin such as the MRB which has a comparatively dense rain gauge network. This suggests good prospects for using radar-based QPE to simulate and forecast streamflow in other parts of the Philippines where rain gauge networks are not as dense.
Health effects, attributed to the environmental pollution resulted from using solvents such as benzene, are relatively unexplored among petroleum workers, personal use, and laboratory researchers. Solvents can cause various health problems, such as neurotoxicity, immunotoxicity, and carcinogenicity. As such it can be absorbed via epidermal or respiratory into the human body resulting in interacting with molecules that are responsible for biochemical and physiological processes of the brain.
Owing to the ever-growing demand for finding a solution, an Ionic liquid can use as an alternative solvent. Ionic liquids are salts in a liquid state at low temperature (below 100 C), or even at room temperature. Ionic liquids impart a unique architectural platform, which has been interesting because of their unusual properties that can be tuned by simple ways such as mixing two ionic liquids.
Ionic liquids not only used as reaction solvents but they became a key developing for novel applications based on their thermal stability, electric conductivity with very low vapor pressure in contrast to the conventional solvents.
In this study, ionic liquids were used as a solvent and reactant at the same time for the novel nanomaterials synthesis for different applications including solar cells, gas sensors, and water splitting.
The field of ionic liquids continues to grow, and become one of the most important branches of science. It appears to be at a point where research and industry can work together in a new way of thinking for green chemistry and sustainable production.
Six N-alkylpyridinium salts [CnPy](2)[MCl4] (n = 4 or 12 and M = Co, Cu, Zn) were synthesized, and their structure and thermal properties were studied. The [C4Py](2)[MCl4] compounds are monoclinic and crystallize in the space group P2(1)/n. The crystals of the longer chain analogues [C12Py](2)[MCl4] are triclinic and crystallize in the space group P (1) over bar. Above the melting temperature, all compounds are ionic liquids (ILs). The derivatives with the longer C12 chain exhibit liquid crystallinity and the shorter chain compounds only show a melting transition. Consistent with single-crystal analysis, electron paramagnetic resonance spectroscopy suggests that the [CuCl4](2-) ions in the Cu-based ILs have a distorted tetrahedral geometry.
Six N-alkylpyridinium salts [CnPy](2)[MCl4] (n = 4 or 12 and M = Co, Cu, Zn) were synthesized, and their structure and thermal properties were studied. The [C4Py](2)[MCl4] compounds are monoclinic and crystallize in the space group P2(1)/n. The crystals of the longer chain analogues [C12Py](2)[MCl4] are triclinic and crystallize in the space group P (1) over bar. Above the melting temperature, all compounds are ionic liquids (ILs). The derivatives with the longer C12 chain exhibit liquid crystallinity and the shorter chain compounds only show a melting transition. Consistent with single-crystal analysis, electron paramagnetic resonance spectroscopy suggests that the [CuCl4](2-) ions in the Cu-based ILs have a distorted tetrahedral geometry.
Label-free electrical detection of consecutive deoxyribonucleic acid (DNA) hybridization/denaturation by means of an array of individually addressable field-effect-based nanoplate silicon-on-insulator (SOI) capacitors modified with gold nanoparticles (Au-NP) is investigated. The proposed device detects charge changes on Au-NP/DNA hybrids induced by the hybridization or denaturation event. DNA hybridization was performed in a high ionic-strength solution to provide a high hybridization efficiency. On the other hand, to reduce the screening of the DNA charge by counter ions and to achieve a high sensitivity, the sensor signal induced by the hybridization and denaturation events was measured in a low ionic-strength solution. High sensor signals of about 120, 90, and 80 mV were registered after the DNA hybridization, denaturation, and re-hybridization events, respectively. Fluorescence microscopy has been applied as reference method to verify the DNA immobilization, hybridization, and denaturation processes. An electrostatic charge-plane model for potential changes at the gate surface of a nanoplate field-effect sensor induced by the DNA hybridization has been developed taking into account both the Debye length and the distance of the DNA charge from the gate surface.
Stress inoculation facilitates active avoidance learning of the semi-precocial rodent Octodon degus
(2010)
A growing body of evidence highlights the impact of the early social environment for the adequate development of brain and behavior in animals and humans. Disturbances of this environment were found to be both maladaptive and adaptive to emotional and cognitive function. Using the semi-precocial, biparental rodent Octodon degus, we aimed to examine (i) the impact of age (juvenile/adult), sex (male/female), and (ii) "motivation" to solve the task (by applying increasing foot-shock-intensities) on two-way active avoidance (TWA) learning in socially reared degus, and (iii) whether early life stress inoculation by 1 h daily parental separation during the first three weeks of life has maladaptive or adaptive consequences on cognitive function as measured by TWA learning. Our results showed that (i) juvenile degus, unlike altricial rats of the same age, can successfully learn the TWA task comparable to adults, and (ii) that learning performance improves with increasing "task motivation", irrespective of age and sex. Furthermore, we revealed that (iii) stress inoculation improves avoidance learning, particularly in juvenile males, quantitatively and qualitatively depending on "task motivation". In conclusion, the present study describes for the first time associative learning in O. degus and its modulation by early life stress experience as an animal model to study the underlying mechanisms of learning and memory in the stressed and unstressed brain. Although, stress is commonly viewed as being maladaptive, our data indicate that early life stress inoculation triggers developmental cascades of adaptive functioning, which may improve cognitive and emotional processing of stressors later in life.
Pollination syndromes and their predictive power regarding actual plant-animal interactions have been controversially discussed in the past. We investigate pollination syndromes in Balsaminaceae, utilizing quantitative respectively categorical data sets of flower morphometry, signal and reward traits for 86 species to test for the effect of different types of data on the test patterns retrieved. Cluster Analyses of the floral traits are used in combination with independent pollinator observations. Based on quantitative data we retrieve seven clusters, six of them corresponding to plausible pollination syndromes and one additional, well-supported cluster comprising highly divergent floral architectures. This latter cluster represents a non-syndrome of flowers not segregated by the specific data set here used. Conversely, using categorical data we obtained only a rudimentary resolution of pollination syndromes, in line with several earlier studies. The results underscore that the use of functional, exactly quanitified trait data has the power to retrieve pollination syndromes circumscribed by the specific data used. Data quality can, however, not be replaced by sheer data volume. With this caveat, it is possible to identify pollination syndromes from large datasets and to reliably extrapolate them for taxa for which direct observations are unavailable.
Does a smile open all doors?
(2020)
Online photographs govern an individual’s choices across a variety of contexts. In sharing arrangements, facial appearance has been shown to affect the desire to collaborate, interest to explore a listing, and even willingness to pay for a stay. Because of the ubiquity of online images and their influence on social attitudes, it seems crucial to be able to control these aspects. The present study examines the effect of different photographic self-disclosures on the provider’s perceptions and willingness to accept a potential co-sharer. The findings from our experiment in the accommodation-sharing context suggest social attraction mediates the effect of photographic self-disclosures on willingness to host. Implications of the results for IS research and practitioners are discussed.
Sharing marketplaces emerged as the new Holy Grail of value creation by enabling exchanges between strangers. Identity reveal, encouraged by platforms, cuts both ways: While inducing pre-transaction confidence, it is suspected of backfiring on the information senders with its discriminative potential. This study employs a discrete choice experiment to explore the role of names as signifiers of discriminative peculiarities and the importance of accompanying cues in peer choices of a ridesharing offer. We quantify users' preferences for quality signals in monetary terms and evidence comparative disadvantage of Middle Eastern descent male names for drivers and co-travelers. It translates into a lower willingness to accept and pay for an offer. Market simulations confirm the robustness of the findings. Further, we discover that females are choosier and include more signifiers of involuntary personal attributes in their decision-making. Price discounts and positive information only partly compensate for the initial disadvantage, and identity concealment is perceived negatively.
Sharing marketplaces emerged as the new Holy Grail of value creation by enabling exchanges between strangers. Identity reveal, encouraged by platforms, cuts both ways: While inducing pre-transaction confidence, it is suspected of backfiring on the information senders with its discriminative potential. This study employs a discrete choice experiment to explore the role of names as signifiers of discriminative peculiarities and the importance of accompanying cues in peer choices of a ridesharing offer. We quantify users' preferences for quality signals in monetary terms and evidence comparative disadvantage of Middle Eastern descent male names for drivers and co-travelers. It translates into a lower willingness to accept and pay for an offer. Market simulations confirm the robustness of the findings. Further, we discover that females are choosier and include more signifiers of involuntary personal attributes in their decision-making. Price discounts and positive information only partly compensate for the initial disadvantage, and identity concealment is perceived negatively.
We used structural topic modeling to analyze over 800,000 German tweets about COVID-19 to answer the questions: What patterns emerge in tweets as a response to a health crisis? And how do topics discussed change over time? The study leans on the goals associated with the health information seeking (GAINS) model, discerning whether a post aims at tackling and eliminating the problem (i.e., problem-focused) or managing the emotions (i.e., emotion-focused); whether it strives to maximize positive outcomes (promotion focus) or to minimize negative outcomes (prevention focus). The findings indicate four clusters salient in public reactions: 1) “Understanding” (problem-promotion); 2) “Action planning” (problem-prevention); 3) “Hope” (emotion-promotion) and 4) “Reassurance” (emotion-prevention). Public communication is volatile over time, and a shift is evidenced from self-centered to community-centered topics within 4.5 weeks. Our study illustrates social media text mining's potential to quickly and efficiently extract public opinions and reactions. Monitoring fears and trending topics enable policymakers to rapidly respond to deviant behavior, like resistive attitudes toward containment measures or deteriorating physical health. Healthcare workers can use the insights to provide mental health services for battling anxiety or extensive loneliness from staying home.
During a crisis event, social media enables two-way communication and many-to-many information broadcasting, browsing others’ posts, publishing own content, and public commenting. These records can deliver valuable insights to approach problematic situations effectively. Our study explores how social media communication can be analyzed to understand the responses to health crises better. Results based on nearly 800 K tweets indicate that the coping and regulation foci framework holds good explanatory power, with four clusters salient in public reactions: 1) “Understanding” (problem-promotion); 2) “Action planning” (problem-prevention); 3) “Hope” (emotion-promotion) and 4) “Reassurance” (emotion-prevention). Second, the inter-temporal analysis shows high volatility of topic proportions and a shift from self-centered to community-centered topics during the course of the event. The insights are beneficial for research on crisis management and practicians who are interested in large-scale monitoring of their audience for well-informed decision-making.
Helping overcome distance, the use of videoconferencing tools has surged during the pandemic. To shed light on the consequences of videoconferencing at work, this study takes a granular look at the implications of the self-view feature for meeting outcomes. Building on self-awareness research and self-regulation theory, we argue that by heightening the state of self-awareness, self-view engagement depletes participants’ mental resources and thereby can undermine online meeting outcomes. Evaluation of our theoretical model on a sample of 179 employees reveals a nuanced picture. Self-view engagement while speaking and while listening is positively associated with self-awareness, which, in turn, is negatively associated with satisfaction with meeting process, perceived productivity, and meeting enjoyment. The criticality of the communication role is put forward: looking at self while listening to other attendees has a negative direct and indirect effect on meeting outcomes; however, looking at self while speaking produces equivocal effects.
With the surging reliance on videoconferencing tools, users may find themselves staring at their reflections for hours a day. We refer to this phenomenon as self-referential information (SRI) consumption and examine its consequences and the mechanism behind them. Building on self-awareness research and the strength model of self-control, we argue that SRI consumption heightens the state of self-awareness and thereby depletes participants’ mental resources, eventually undermining virtual meeting (VM) outcomes. Our findings from a European employee sample revealed contrary effects of SRI consumption across speaker vs listener roles. Engagement with self-view is positively associated with self-awareness, which, in turn, is negatively related to satisfaction with VM process, perceived productivity, and enjoyment. Looking at the self while listening to others exhibits adverse direct and indirect (via self-awareness) effects on VM outcomes. However, looking at the self when speaking exhibits positive direct effects on satisfaction with VM process and enjoyment.
Despite the phenomenal growth of Big Data Analytics in the last few years, little research is done to explicate the relationship between Big Data Analytics Capability (BDAC) and indirect strategic value derived from such digital capabilities. We attempt to address this gap by proposing a conceptual model of the BDAC - Innovation relationship using dynamic capability theory. The work expands on BDAC business value research and extends the nominal research done on BDAC – innovation. We focus on BDAC's relationship with different innovation objects, namely product, business process, and business model innovation, impacting all value chain activities. The insights gained will stimulate academic and practitioner interest in explicating strategic value generated from BDAC and serve as a framework for future research on the subject
One for all, all for one
(2022)
We propose a conceptual model of acceptance of contact tracing apps based on the privacy calculus perspective. Moving beyond the duality of personal benefits and privacy risks, we theorize that users hold social considerations (i.e., social benefits and risks) that underlie their acceptance decisions. To test our propositions, we chose the context of COVID-19 contact tracing apps and conducted a qualitative pre-study and longitudinal quantitative main study with 589 participants from Germany and Switzerland. Our findings confirm the prominence of individual privacy calculus in explaining intention to use and actual behavior. While privacy risks are a significant determinant of intention to use, social risks (operationalized as fear of mass surveillance) have a notably stronger impact. Our mediation analysis suggests that social risks represent the underlying mechanism behind the observed negative link between individual privacy risks and contact tracing apps' acceptance. Furthermore, we find a substantial intention–behavior gap.
One for all, all for one
(2022)
We propose a conceptual model of acceptance of contact tracing apps based on the privacy calculus perspective. Moving beyond the duality of personal benefits and privacy risks, we theorize that users hold social considerations (i.e., social benefits and risks) that underlie their acceptance decisions. To test our propositions, we chose the context of COVID-19 contact tracing apps and conducted a qualitative pre-study and longitudinal quantitative main study with 589 participants from Germany and Switzerland. Our findings confirm the prominence of individual privacy calculus in explaining intention to use and actual behavior. While privacy risks are a significant determinant of intention to use, social risks (operationalized as fear of mass surveillance) have a notably stronger impact. Our mediation analysis suggests that social risks represent the underlying mechanism behind the observed negative link between individual privacy risks and contact tracing apps' acceptance. Furthermore, we find a substantial intention–behavior gap.
Aims. We aim for an understanding of the morphological and spectral properties of the supernova remnant RCW 86 and for insights into the production mechanism leading to the RCW 86 very high-energy gamma-ray emission. Methods. We analyzed High Energy Spectroscopic System (H.E.S.S.) data that had increased sensitivity compared to the observations presented in the RCW 86 H.E.S.S. discovery publication. Studies of the morphological correlation between the 0.5-1 keV X-ray band, the 2-5 keV X-ray band, radio, and gamma-ray emissions have been performed as well as broadband modeling of the spectral energy distribution with two different emission models. Results. We present the first conclusive evidence that the TeV gamma-ray emission region is shell-like based on our morphological studies. The comparison with 2-5 keV X-ray data reveals a correlation with the 0.4-50 TeV gamma-ray emission. The spectrum of RCW 86 is best described by a power law with an exponential cutoff at E-cut = (3.5 +/- 1.2(stat)) TeV and a spectral index of Gamma approximate to 1.6 +/- 0.2. A static leptonic one-zone model adequately describes the measured spectral energy distribution of RCW 86, with the resultant total kinetic energy of the electrons above 1 GeV being equivalent to similar to 0.1% of the initial kinetic energy of a Type Ia supernova explosion (10(51) erg). When using a hadronic model, a magnetic field of B approximate to 100 mu G is needed to represent the measured data. Although this is comparable to formerly published estimates, a standard E-2 spectrum for the proton distribution cannot describe the gamma-ray data. Instead, a spectral index of Gamma(p) approximate to 1.7 would be required, which implies that similar to 7 x 10(49)/n(cm-3) erg has been transferred into high-energy protons with the effective density n(cm-3) = n/1 cm(-3). This is about 10% of the kinetic energy of a typical Type Ia supernova under the assumption of a density of 1 cm(-3).
A deep observation campaign carried out by the High Energy Stereoscopic System (HESS) on Centaurus A enabled the discovery of gamma-rays from the blazar 1ES 1312-423, 2 degrees away from the radio galaxy. With a differential flux at 1 TeV of phi(1 TeV) = (1.9 +/- 0.6(stat) +/- 0.4(sys)) x 10(-13) cm(-2) s(-1) TeV-1 corresponding to 0.5 per cent of the Crab nebula differential flux and a spectral index Gamma = 2.9 +/- 0.5(stat) +/- 0.2(sys), 1ES 1312-423 is one of the faintest sources ever detected in the very high energy (E > 100 GeV) extragalactic sky. A careful analysis using three and a half years of Fermi Large Area Telescope (Fermi-LAT) data allows the discovery at high energies (E > 100 MeV) of a hard spectrum (Gamma = 1.4 +/- 0.4(stat) +/- 0.2(sys)) source coincident with 1ES 1312-423. Radio, optical, UV and X-ray observations complete the spectral energy distribution of this blazar, now covering 16 decades in energy. The emission is successfully fitted with a synchrotron self-Compton model for the non-thermal component, combined with a blackbody spectrum for the optical emission from the host galaxy.
Discovery of high and very high-energy emission from the BL Lacertae object SHBL J001355.9-185406
(2013)
The detection of the high-frequency peaked BL Lac object (HBL) SHBL J001355.9-185406 (z = 0.095) at high (HE; 100 MeV < E < 300 GeV) and very high-energy (VHE; E > 100 GeV) with the Fermi Large Area Telescope (LAT) and the High Energy Stereoscopic System (H.E.S.S.) is reported. Dedicated observations were performed with the H. E. S. S. telescopes, leading to a detection at the 5.5 sigma significance level. The measured flux above 310 GeV is (8.3 +/- 1.7(stat) +/- 1.7(sys)) x 10(-13) photons cm(-2) s(-1) (about 0.6% of that of the Crab Nebula), and the power-law spectrum has a photon index of Gamma = 3.4 +/- 0.5(stat) +/- 0.2(sys). Using 3.5 years of publicly available Fermi-LAT data, a faint counterpart has been detected in the LAT data at the 5.5 sigma significance level, with an integrated flux above 300 MeV of (9.3 +/- 3.4(stat) +/- 0.8(sys)) x 10(-10) photons cm(-2) s(-1) and a photon index of Gamma = 1.96 +/- 0.20(stat) +/- 0.08(sys). X-ray observations with Swift-XRT allow the synchrotron peak energy in vF(v) representation to be located at similar to 1.0 keV. The broadband spectral energy distribution is modelled with a one-zone synchrotron self-Compton (SSC) model and the optical data by a black-body emission describing the thermal emission of the host galaxy. The derived parameters are typical of HBLs detected at VHE, with a particle-dominated jet.
The quasar PKS 1510-089 (z = 0.361) was observed with the H.E.S.S. array of imaging atmospheric Cherenkov telescopes during high states in the optical and GeV bands, to search for very high energy (VHE, defined as E >= 0.1 TeV) emission. VHE gamma-rays were detected with a statistical significance of 9.2 standard deviations in 15.8 h of H. E. S. S. data taken during March and April 2009. A VHE integral flux of I(0.15 TeV < E < 1.0TeV) = (1.0 +/- 0.2(stat) +/- 0.2(sys)) x 10(-11) cm(-2) s(-1) is measured. The best-fit power law to the VHE data has a photon index of G = 5.4 +/- 0.7(stat) +/- 0.3(sys). The GeV and optical light curves show pronounced variability during the period of H.E.S.S. observations. However, there is insufficient evidence to claim statistically significant variability in the VHE data. Because of its relatively high redshift, the VHE flux from PKS 1510-089 should suffer considerable attenuation in the intergalactic space due to the extragalactic background light (EBL). Hence, the measured gamma-ray spectrum is used to derive upper limits on the opacity due to EBL, which are found to be comparable with the previously derived limits from relatively-nearby BL Lac objects. Unlike typical VHE-detected blazars where the broadband spectrum is dominated by nonthermal radiation at all wavelengths, the quasar PKS 1510-089 has a bright thermal component in the optical to UV frequency band. Among all VHE detected blazars, PKS 1510-089 has the most luminous broad line region. The detection of VHE emission from this quasar indicates a low level of gamma - gamma absorption on the internal optical to UV photon field.
Context. Globular clusters (GCs) are established emitters of high-energy (HE, 100 MeV < E < 100 GeV) gamma-ray radiation which could originate from the cumulative emission of the numerous millisecond pulsars (msPSRs) in the clusters’ cores or from inverse Compton (IC) scattering of relativistic leptons accelerated in the GC environment. These stellar clusters could also constitute a new class of sources in the very-high-energy (VHE, E > 100 GeV) gamma-ray regime, judging from the recent detection of a signal from the direction of Terzan 5 with the H.E.S.S. telescope array. Aims. To search for VHE gamma-ray sources associated with other GCs, and to put constraints on leptonic emission models, we systematically analyzed the observations towards 15 GCs taken with the H. E. S. S. array of imaging atmospheric Cherenkov telescopes. Methods. We searched for point-like and extended VHE gamma-ray emission from each GC in our sample and also performed a stacking analysis combining the data from all GCs to investigate the hypothesis of a population of faint emitters. Assuming IC emission as the origin of the VHE gamma-ray signal from the direction of Terzan 5, we calculated the expected gamma-ray flux from each of the 15 GCs, based on their number of millisecond pulsars, their optical brightness and the energy density of background photon fields. Results. We did not detect significant VHE gamma-ray emission from any of the 15 GCs in either of the two analyses. Given the uncertainties related to the parameter determinations, the obtained flux upper limits allow to rule out the simple IC/msPSR scaling model for NGC6388 and NGC7078. The upper limits derived from the stacking analyses are factors between 2 and 50 below the flux predicted by the simple leptonic scaling model, depending on the assumed source extent and the dominant target photon fields. Therefore, Terzan 5 still remains exceptional among all GCs, as the VHE gamma-ray emission either arises from extra-ordinarily efficient leptonic processes, or from a recent catastrophic event, or is even unrelated to the GC itself.
Gamma-ray line signatures can be expected in the very-high-energy (E-gamma > 100 GeV) domain due to self-annihilation or decay of dark matter (DM) particles in space. Such a signal would be readily distinguishable from astrophysical gamma-ray sources that in most cases produce continuous spectra that span over several orders of magnitude in energy. Using data collected with the H. E. S. S. gamma-ray instrument, upper limits on linelike emission are obtained in the energy range between similar to 500 GeV and similar to 25 TeV for the central part of the Milky Way halo and for extragalactic observations, complementing recent limits obtained with the Fermi-LAT instrument at lower energies. No statistically significant signal could be found. For monochromatic gamma-ray line emission, flux limits of (2 x 10(-7)-2 x 10(-5)) m(-2)s(-1)sr(-1) and (1 x 10(-8)- 2 x 10(-6)) m(-2)s(-1)sr(-1) are obtained for the central part of the Milky Way halo and extragalactic observations, respectively. For a DM particle mass of 1 TeV, limits on the velocity- averaged DM annihilation cross section <sigma upsilon >(chi chi ->gamma gamma) reach similar to 10(-27)cm(3)s(-1), based on the Einasto parametrization of the Galactic DM halo density profile. DOI: 10.1103/PhysRevLett.110.041301
HESS observations of the binary system PSR B1259-63/LS 2883 around the 2010/2011 periastron passage
(2013)
Aims. We present very high energy (VHE; E > 100 GeV) data from the gamma-ray binary system PSR B1259-63/LS 2883 taken around its periastron passage on 15th of December 2010 with the High Energy Stereoscopic System (H. E. S. S.) of Cherenkov Telescopes. We aim to search for a possible TeV counterpart of the GeV flare detected by the Fermi LAT. In addition, we aim to study the current periastron passage in the context of previous observations taken at similar orbital phases, testing the repetitive behaviour of the source.
Methods. Observations at VHEs were conducted with H.E.S.S. from 9th to 16th of January 2011. The total dataset amounts to similar to 6 h of observing time. The data taken around the 2004 periastron passage were also re-analysed with the current analysis techniques in order to extend the energy spectrum above 3 TeV to fully compare observation results from 2004 and 2011.
Results. The source is detected in the 2011 data at a significance level of 11.5 sigma revealing an averaged integral flux above 1 TeV of (1.01 +/- 0.18(stat) +/- 0.20(sys)) x 10(-12) cm(-2) s(-1). The differential energy spectrum follows a power-law shape with a spectral index Gamma = 2.92 +/- 0.30(stat) +/- 0.20(sys) and a flux normalisation at 1 TeV of N-0 = (1.95 +/- 0.32(stat) +/- 0.39(sys)) x 10(-12) TeV-1 cm(-2) s(-1). The measured light curve does not show any evidence for variability of the source on the daily scale. The re-analysis of the 2004 data yields results compatible with the published ones. The differential energy spectrum measured up to similar to 10 TeV is consistent with a power law with a spectral index Gamma = 2.81 +/- 0.10(stat) +/- 0.20(sys) and a flux normalisation at 1 TeV of N-0 = (1.29 +/- 0.08(stat) +/- 0.26(sys)) x 10(-12) TeV-1 cm(-2) s(-1).
Conclusions. The measured integral flux and the spectral shape of the 2011 data are compatible with the results obtained around previous periastron passages. The absence of variability in the H.E.S.S. data indicates that the GeV flare observed by Fermi LAT in the time period covered also by H.E.S.S. observations originates in a different physical scenario than the TeV emission. Moreover, the comparison of the new results to the results from the 2004 observations made at a similar orbital phase provides a stronger evidence of the repetitive behaviour of the source.
The 2010 very high energy gamma-ray flare and 10 years ofmulti-wavelength oservations of M 87
(2012)
The giant radio galaxy M 87 with its proximity (16 Mpc), famous jet, and very massive black hole ((3-6) x 10(9) M-circle dot) provides a unique opportunity to investigate the origin of very high energy (VHE; E > 100 GeV) gamma-ray emission generated in relativistic outflows and the surroundings of supermassive black holes. M 87 has been established as a VHE gamma-ray emitter since 2006. The VHE gamma-ray emission displays strong variability on timescales as short as a day. In this paper, results from a joint VHE monitoring campaign on M 87 by the MAGIC and VERITAS instruments in 2010 are reported. During the campaign, a flare at VHE was detected triggering further observations at VHE (H.E.S.S.), X-rays (Chandra), and radio (43 GHz Very Long Baseline Array, VLBA). The excellent sampling of the VHE gamma-ray light curve enables one to derive a precise temporal characterization of the flare: the single, isolated flare is well described by a two-sided exponential function with significantly different flux rise and decay times of tau(rise)(d) = (1.69 +/- 0.30) days and tau(decay)(d) = (0.611 +/- 0.080) days, respectively. While the overall variability pattern of the 2010 flare appears somewhat different from that of previous VHE flares in 2005 and 2008, they share very similar timescales (similar to day), peak fluxes (Phi(>0.35 TeV) similar or equal to (1-3) x 10(-11) photons cm(-2) s(-1)), and VHE spectra. VLBA radio observations of 43 GHz of the inner jet regions indicate no enhanced flux in 2010 in contrast to observations in 2008, where an increase of the radio flux of the innermost core regions coincided with a VHE flare. On the other hand, Chandra X-ray observations taken similar to 3 days after the peak of the VHE gamma-ray emission reveal an enhanced flux from the core (flux increased by factor similar to 2; variability timescale <2 days). The long-term (2001-2010) multi-wavelength (MWL) light curve of M 87, spanning from radio to VHE and including data from Hubble Space Telescope, Liverpool Telescope, Very Large Array, and European VLBI Network, is used to further investigate the origin of the VHE gamma-ray emission. No unique, common MWL signature of the three VHE flares has been identified. In the outer kiloparsec jet region, in particular in HST-1, no enhanced MWL activity was detected in 2008 and 2010, disfavoring it as the origin of the VHE flares during these years. Shortly after two of the three flares (2008 and 2010), the X-ray core was observed to be at a higher flux level than its characteristic range (determined from more than 60 monitoring observations: 2002-2009). In 2005, the strong flux dominance of HST-1 could have suppressed the detection of such a feature. Published models for VHE gamma-ray emission from M 87 are reviewed in the light of the new data.
Discovery of very high energy gamma-ray emission from the BL Lacertae
object PKS0301-243 with HESS
(2013)
The active galactic nucleus PKS 0301-243 (z = 0.266) is a high-synchrotron-peaked BL Lac object that is detected at high energies (HE, 100 MeV < E < 100 GeV) by Fermi/LAT. This paper reports on the discovery of PKS 0301-243 at very high energies (E > 100 GeV) by the High Energy Stereoscopic System (H.E.S.S.) from observations between September 2009 and December 2011 for a total live time of 34.9 h. Gamma rays above 200 GeV are detected at a significance of 9.4 sigma. A hint of variability at the 2.5 sigma level is found. An integral flux I(E > 200GeV) = (3.3 +/- 1.1(stat) +/- 0.7(syst)) x 10(-12) ph cm(-2) s(-1) and a photon index Gamma = 4.6 +/- 0.7(stat) +/- 0.2(syst) are measured. Multi-wavelength light curves in HE, X-ray and optical bands show strong variability, and a minimal variability timescale of eight days is estimated from the optical light curve. A single-zone leptonic synchrotron self-Compton scenario satisfactorily reproduces the multi-wavelength data. In this model, the emitting region is out of equipartition and the jet is particle dominated. Because of its high redshift compared to other sources observed at TeV energies, the very high energy emission from PKS 0301-243 is attenuated by the extragalactic background light (EBL) and the measured spectrum is used to derive an upper limit on the opacity of the EBL.
Axionlike particles (ALPs) are hypothetical light (sub-eV) bosons predicted in some extensions of the Standard Model of particle physics. In astrophysical environments comprising high-energy gamma rays and turbulent magnetic fields, the existence of ALPs can modify the energy spectrum of the gamma rays for a sufficiently large coupling between ALPs and photons. This modification would take the form of an irregular behavior of the energy spectrum in a limited energy range. Data from the H. E. S. S. observations of the distant BL Lac object PKS 2155 - 304 (z = 0.116) are used to derive upper limits at the 95% C. L. on the strength of the ALP coupling to photons, g(gamma a) < 2.1 x 10(-11) GeV-1 for an ALP mass between 15 and 60 neV. The results depend on assumptions on the magnetic field around the source, which are chosen conservatively. The derived constraints apply to both light pseudoscalar and scalar bosons that couple to the electromagnetic field.
Very high-energy gamma-ray emission from PKS 0447-439 was detected with the H. E. S. S. Cherenkov telescope array in December 2009. This blazar is one of the brightest extragalactic objects in the Fermi bright source list and has a hard spectrum in the MeV to GeV range. In the TeV range, a photon index of 3.89 +/- 0.37 (stat) +/- 0.22 (sys) and a flux normalisation at 1 TeV, phi(1) (TeV) = (3.5 +/- 1.1(stat) +/- 0.9(sys)) x 10(-13) cm(-2) s(-1) TeV-1 were found. The detection with H. E. S. S. triggered observations in the X-ray band with the Swift and RXTE telescopes. Simultaneous UV and optical data from Swift UVOT and data from the optical telescopes ATOM and ROTSE are also available. The spectrum and light curve measured with H. E. S. S. are presented and compared to the multi-wavelength data at lower energies. A rapid flare is seen in the Swift XRT and RXTE data, together with a flux variation in the UV band, at a time scale of the order of one day. A firm upper limit of z < 0.59 on the redshift of PKS 0447-439 is derived from the combined Fermi-LAT and H. E. S. S. data, given the assumptions that there is no upturn in the intrinsic spectrum above the Fermi-LAT energy range and that absorption on the extragalactic background light (EBL) is not weaker than the lower limit provided by current models. The spectral energy distribution is well described by a simple one-zone synchrotron self-Compton scenario, if the redshift of the source is less than z less than or similar to 0.4.
The gamma-ray spectrum of the low-frequency-peaked BL Lac (LBL) object AP Librae is studied, following the discovery of very-high-energy (VHE; E > 100 GeV) gamma-ray emission up to the TeV range by the H.E.S.S. experiment. Thismakes AP Librae one of the few VHE emitters of the LBL type. The measured spectrum yields a flux of (8.8 +/- 1.5(stat) +/- 1.8(sys)) x 10(-12) cm(-2) s(-1) above 130 GeV and a spectral index of Gamma = 2.65 +/- 0.19(stat) +/- 0.20(sys). This study also makes use of Fermi-LAT observations in the high energy (HE, E > 100 MeV) range, providing the longest continuous light curve (5 years) ever published on this source. The source underwent a flaring event between MJD 56 306-56 376 in the HE range, with a flux increase of a factor of 3.5 in the 14 day bin light curve and no significant variation in spectral shape with respect to the low-flux state. While the H.E.S.S. and (low state) Fermi-LAT fluxes are in good agreement where they overlap, a spectral curvature between the steep VHE spectrum and the Fermi-LAT spectrum is observed. The maximum of the gamma-ray emission in the spectral energy distribution is located below the GeV energy range.
Aims. Previous observations with the High Energy Stereoscopic System (H.E.S.S.) have revealed an extended very-high-energy (VHE; E > 100 GeV) gamma-ray source, HESS J1834-087, coincident with the supernova remnant (SNR) W41. The origin of the gamma-ray emission was investigated in more detail with the H.E.S.S. array and the Large Area Telescope (LAT) onboard the Fermi Gamma-ray Space Telescope.
Methods. The gamma-ray data provided by 61 h of observations with H.E.S.S., and four years with the Fermi LAT were analyzed, covering over five decades in energy from 1.8 GeV up to 30 TeV. The morphology and spectrum of the TeV and GeV sources were studied and multiwavelength data were used to investigate the origin of the gamma-ray emission toward W41.
Results. The TeV source can be modeled with a sum of two components: one point-like and one significantly extended (sigma(TeV) = 0.17 degrees +/- 0.01 degrees), both centered on SNR W41 and exhibiting spectra described by a power law with index Gamma(TeV) similar or equal to 2.6. The GeV source detected with Fermi LAT is extended (sigma(GeV) = 0.15 degrees +/- 0.03 degrees) and morphologically matches the VHE emission. Its spectrum can be described by a power-law model with an index Gamma(GeV) = 2.15 +/- 0.12 and smoothly joins the spectrum of the whole TeV source. A break appears in the gamma-ray spectra around 100 GeV. No pulsations were found in the GeV range.
Conclusions. Two main scenarios are proposed to explain the observed emission: a pulsar wind nebula (PWN) or the interaction of SNR W41 with an associated molecular cloud. X-ray observations suggest the presence of a point-like source (a pulsar candidate) near the center of the remnant and nonthermal X-ray diffuse emission that could arise from the possibly associated PWN. The PWN scenario is supported by the compatible positions of the TeV and GeV sources with the putative pulsar. However, the spectral energy distribution from radio to gamma-rays is reproduced by a one-zone leptonic model only if an excess of low-energy electrons is injected following a Maxwellian distribution by a pulsar with a high spin-down power (> 10(37) erg s(-1)). This additional low-energy component is not needed if we consider that the point-like TeV source is unrelated to the extended GeV and TeV sources. The interacting SNR scenario is supported by the spatial coincidence between the gamma-ray sources, the detection of OH (1720 MHz) maser lines, and the hadronic modeling.
Context. Very-high-energy (VHE; E > 100 GeV) gamma-ray emission from blazars inevitably gives rise to electron-positron pair production through the interaction of these gamma-rays with the extragalactic background light (EBL). Depending on the magnetic fields in the proximity of the source, the cascade initiated from pair production can result in either an isotropic halo around an initially- beamed source or a magnetically- broadened cascade :aux.
Aims. Both extended pair-halo (PH) and magnetically broadened cascade (MBC) emission from regions surrounding the blazars 1ES 1101-232, IRS 0229+200, and PKS 2155-304 were searched for using VHE y-ray data taken with the High Energy Stereoscopic System (HESS.) and high-energy (HE; 100 MeV < E < 100 GeV) gamma-ray data with the Fermi Large Area Telescope (LAT).
Methods. By comparing the angular distributions of the reconstructed gamma-ray events to the angular profiles calculated from detailed theoretical models, the presence of PH and MBC was investigated.
Results. Upper limits on the extended emission around lES 1101-232, lES 0229+200, and PKS 2155-304 are found to be at a level of a few per cent of the Crab nebula flux above 1 TeV, depending on the assumed photon index of the cascade emission. Assuming strong extra-Galactic magnetic field (EGME) values, >10(-12) G, this limits the production of pair haloes developing from electromagnetic cascades. For weaker magnetic fields, in which electromagnetic cascades would result in MBCs. EGMF strengths in the range (0.3-3) x 10(-15) G were excluded for PKS 2155-304 at the 99% confidence level, under the assumption of a 1 Mpc coherence length.
Composite supernova remnants (SNRs) constitute a small subclass of the remnants of massive stellar explosions where non-thermal radiation is observed from both the expanding shell-like shock front and from a pulsar wind nebula (PWN) located inside of the SNR. These systems represent a unique evolutionary phase of SNRs where observations in the radio, X-ray, and gamma-ray regimes allow the study of the co-evolution of both these energetic phenomena. In this article, we report results from observations of the shell-type SNR G15.4+0.1 performed with the High Energy Stereoscopic System (H. E. S. S.) and XMM-Newton. A compact TeV gamma-ray source, HESS J1818-154, located in the center and contained within the shell of G15.4+0.1 is detected by H. E. S. S. and featurs a spectrum best represented by a power-law model with a spectral index of -2.3 +/- 0.3(stat) +/- 0.2(sys) and an integral flux of F(>0.42 TeV) = (0.9 +/- 0.3(stat) +/- 0.2(sys)) x 10(-12) cm(-2) s(-1). Furthermore, a recent observation with XMM-Newton reveals extended X-ray emission strongly peaked in the center of G15.4+0.1. The X-ray source shows indications of an energy-dependent morphology featuring a compact core at energies above 4 keV and more extended emission that fills the entire region within the SNR at lower energies. Together, the X-ray and VHE gamma-ray emission provide strong evidence of a PWN located inside the shell of G15.4+0.1 and this SNR can therefore be classified as a composite based on these observations. The radio, X-ray, and gamma-ray emission from the PWN is compatible with a one-zone leptonic model that requires a low average magnetic field inside the emission region. An unambiguous counterpart to the putative pulsar, which is thought to power the PWN, has been detected neither in radio nor in X-ray observations of G15.4+0.1.
HESS J1640-465 - an exceptionally luminous TeV gamma-ray supernova remnant (vol 439, pg 2828, 2014)
(2014)
TeV gamma-ray observations of the young synchrotron-dominated SNRs G1.9+0.3 and G330.2+1.0 with HESS
(2014)
The non-thermal nature of the X-ray emission from the shell-type supernova remnants (SNRs) G1.9+0.3 and G330.2+1.0 is an indication of intense particle acceleration in the shock fronts of both objects. This suggests that the SNRs are prime candidates for very-high-energy (VHE; E > 0.1 TeV) gamma-ray observations. G1.9+0.3, recently established as the youngest known SNR in the Galaxy, also offers a unique opportunity to study the earliest stages of SNR evolution in the VHE domain. The purpose of this work is to probe the level of VHE gamma-ray emission from both SNRs and use this to constrain their physical properties. Observations were conducted with the H. E. S. S. (High Energy Stereoscopic System) Cherenkov Telescope Array over a more than six-year period spanning 2004-2010. The obtained data have effective livetimes of 67 h for G1.9+0.3 and 16 h for G330.2+1.0. The data are analysed in the context of the multiwavelength observations currently available and in the framework of both leptonic and hadronic particle acceleration scenarios. No significant gamma-ray signal from G1.9+0.3 or G330.2+1.0 was detected. Upper limits (99 per cent confidence level) to the TeV flux from G1.9+0.3 and G330.2+1.0 for the assumed spectral index Gamma = 2.5 were set at 5.6 x 10(-1)3 cm(-2) s(-1) above 0.26 TeV and 3.2 x 10(-12) cm(-2) s(-1) above 0.38 TeV, respectively. In a one-zone leptonic scenario, these upper limits imply lower limits on the interior magnetic field to B-G1.9 greater than or similar to 12 mu G for G1.9+0.3 and to B-G330 greater than or similar to 8 mu G for G330.2+1.0. In a hadronic scenario, the low ambient densities and the large distances to the SNRs result in very low predicted fluxes, for which the H.E.S.S. upper limits are not constraining.
Context. About 40% of the observation time of the High Energy Stereoscopic System (H.E.S.S.) is dedicated to studying active galactic nuclei (AGN), with the aim of increasing the sample of known extragalactic very-high-energy (VHE, E > 100 GeV) sources and constraining the physical processes at play in potential emitters.
Aims. H.E.S.S. observations of AGN, spanning a period from April 2004 to December 2011, are investigated to constrain their gamma-ray fluxes. Only the 47 sources without significant excess detected at the position of the targets are presented.
Methods. Upper limits on VHE fluxes of the targets were computed and a search for variability was performed on the nightly time scale.
Results. For 41 objects, the flux upper limits we derived are the most constraining reported to date. These constraints at VHE are compared with the flux level expected from extrapolations of Fermi-LAT measurements in the two-year catalog of AGN. The H.E.S.S. upper limits are at least a factor of two lower than the extrapolated Fermi-LAT fluxes for 11 objects Taking into account the attenuation by the extragalactic background light reduces the tension for all but two of them, suggesting intrinsic curvature in the high-energy spectra of these two AGN.
Conclusions. Compilation efforts led by current VHE instruments are of critical importance for target-selection strategies before the advent of the Cherenkov Telescope Array (CTA).
The results of follow-up observations of the TeV gamma-ray source HESS J1640-465 from 2004 to 2011 with the High Energy Stereoscopic System (HESS) are reported in this work. The spectrum is well described by an exponential cut-off power law with photon index Gamma = 2.11 +/- 0.09(stat) +/- 0.10(sys), and a cut-off energy of E-2 = 6.0(-1.2)(+2.0) TeV. The TeV emission is significantly extended and overlaps with the northwestern part of the shell of the SNR G338.3-0.0. The new HESS results, a re-analysis of archival XMM-Newton data and multiwavelength observations suggest that a significant part of the gamma-ray emission from HESS J1640-465 originates in the supernova remnant shell. In a hadronic scenario, as suggested by the smooth connection of the GeV and TeV spectra, the product of total proton energy and mean target density could be as high as W(p)n(H) similar to 4 x 10(52)(d/10kpc)(2) erg cm(-3).
Search for TeV Gamma-ray emission from GRB 100621A, an extremely bright GRB in X-rays, with HESS
(2014)
The long gamma-ray burst (GRB) 100621A, at the time the brightest X-ray transient ever detected by Swift-XRT in the 0.3-10 keV range, has been observed with the H.E.S.S. imaging air Cherenkov telescope array, sensitive to gamma radiation in the very-high-energy (VHE, >100 GeV) regime. Due to its relatively small redshift of z similar to 0.5, the favourable position in the southern sky and the relatively short follow-up time (<700 s after the satellite trigger) of the H.E.S.S. observations, this GRB could be within the sensitivity reach of the HESS. instrument. The analysis of the HESS. data shows no indication of emission and yields an integral flux upper limit above similar to 380 GeV of 4.2 x 10(-12) cm(-2) s(-1) s (95% confidence level), assuming a simple Band function extension model. A comparison to a spectral-temporal model, normalised to the prompt flux at sub-MeV energies, constraints the existence of a temporally extended and strong additional hard power law, as has been observed in the other bright X-ray GRB 130427A. A comparison between the HESS. upper limit and the contemporaneous energy output in X-rays constrains the ratio between the X-ray and VHE gamma-ray fluxes to be greater than 0.4. This value is an important quantity for modelling the afterglow and can constrain leptonic emission scenarios, where leptons are responsible for the X-ray emission and might produce VHE gamma rays.
The Large Magellanic Cloud, a satellite galaxy of the Milky Way, has been observed with the High Energy Stereoscopic System (H.E.S.S.) above an energy of 100 billion electron volts for a deep exposure of 210 hours. Three sources of different types were detected: the pulsar wind nebula of the most energetic pulsar known, N 157B; the radio-loud supernova remnant N 132D; and the largest nonthermal x-ray shell, the superbubble 30 Dor C. The unique object SN 1987A is, unexpectedly, not detected, which constrains the theoretical framework of particle acceleration in very young supernova remnants. These detections reveal the most energetic tip of a g-ray source population in an external galaxy and provide via 30 Dor C the unambiguous detection of g-ray emission from a superbubble.
Very high energy (VHE, E > 100 GeV)gamma-ray flaring activity of the high-frequency peaked BL Lac object PG 1553 + 113 has been detected by the H.E.S.S. telescopes. The flux of the source increased by a factor of 3 during the nights of 2012 April 26 and 27 with respect to the archival measurements with a hint of intra-night variability. No counterpart of this event has been detected in the Fermi-Large Area Telescope data. This pattern is consistent with VHE gamma(-)ray flaring being caused by the injection of ultrarelativistic particles, emitting.-rays at the highest energies. The dataset offers a unique opportunity to constrain the redshift of this source at z = 0.49 +/- 0.04 using a novel method based on Bayesian statistics. The indication of intra-night variability is used to introduce a novel method to probe for a possible Lorentz invariance violation (LIV), and to set limits on the energy scale at which Quantum Gravity (QG) effects causing LIV may arise. For the subluminal case, the derived limits are E-QG,E- 1 > 4.10 x 10(17) GeV and E-QG,E- 2 > 2.10 x 10(10) GeV for linear and quadratic LIV effects, respectively.
Search for dark matter annihilation signatures in HESS observations of
dwarf spheroidal galaxies
(2014)
Dwarf spheroidal galaxies of the Local Group are close satellites of the Milky Way characterized by a large mass-to-light ratio and are not expected to be the site of nonthermal high-energy gamma-ray emission or intense star formation. Therefore they are among the most promising candidates for indirect dark matter searches. During the last years the High Energy Stereoscopic System (H.E.S.S.) of imaging atmospheric Cherenkov telescopes observed five of these dwarf galaxies for more than 140 hours in total, searching for TeV gamma-ray emission from annihilation of dark matter particles. The new results of the deep exposure of the Sagittarius dwarf spheroidal galaxy, the first observations of the Coma Berenices and Fornax dwarves and the reanalysis of two more dwarf spheroidal galaxies already published by the H.E.S.S. Collaboration, Carina and Sculptor, are presented. In the absence of a significant signal new constraints on the annihilation cross section applicable to weakly interacting massive particles (WIMPs) are derived by combining the observations of the five dwarf galaxies. The combined exclusion limit depends on the WIMP mass and the best constraint is reached at 1-2 TeV masses with a cross-section upper bound of similar to 3.9 x 10(-24) cm(3) s(-1) at a 95% confidence level.
Diffuse gamma-ray emission is the most prominent observable signature of celestial cosmic-ray interactions at high energies. While already being investigated at GeVenergies over several decades, assessments of diffuse gamma-ray emission at TeVenergies remain sparse. After completion of the systematic survey of the inner Galaxy, the H.E.S.S. experiment is in a prime position to observe large-scale diffuse emission at TeVenergies. Data of the H.E.S.S. Galactic Plane Survey are investigated in regions off known gamma-ray sources. Corresponding gamma-ray flux measurements were made over an extensive grid of celestial locations. Longitudinal and latitudinal profiles of the observed gamma-ray fluxes show characteristic excess emission not attributable to known gamma-ray sources. For the first time large-scale gamma-ray emission along the Galactic plane using imaging atmospheric Cherenkov telescopes has been observed. While the background subtraction technique limits the ability to recover modest variation on the scale of the H.E.S.S. field of view or larger, which is characteristic of the inverse Compton scatter-induced Galactic diffuse emission, contributions of neutral pion decay as well as emission from unresolved gamma-ray sources can be recovered in the observed signal to a large fraction. Calculations show that the minimum gamma-ray emission from pi(0) decay represents a significant contribution to the total signal. This detection is interpreted as a mix of diffuse Galactic gamma-ray emission and unresolved sources.
An annihilation signal of dark matter is searched for from the central region of the Milky Way. Data acquired in dedicated on-off observations of the Galactic center region with H.E.S.S. are analyzed for this purpose. No significant signal is found in a total of similar to 9 h of on-off observations. Upper limits on the velocity averaged cross section, <sigma upsilon >, for the annihilation of dark matter particles with masses in the range of similar to 300 GeV to similar to 10 TeV are derived. In contrast to previous constraints derived from observations of the Galactic center region, the constraints that are derived here apply also under the assumption of a central core of constant dark matter density around the center of the Galaxy. Values of <sigma upsilon > that are larger than 3 x 10(-24) cm(3)/s are excluded for dark matter particles with masses between similar to 1 and similar to 4 TeV at 95% C.L. if the radius of the central dark matter density core does not exceed 500 pc. This is the strongest constraint that is derived on <sigma upsilon > for annihilating TeV mass dark matter without the assumption of a centrally cusped dark matter density distribution in the search region.
Context. Puppis A is an interesting similar to 4 kyr-old supernova remnant (SNR) that shows strong evidence of interaction between the forward shock and a molecular cloud. It has been studied in detail from radio frequencies to high-energy (HE, 0.1-100 GeV) gamma-rays. An analysis of the Fermi-LAT data has shown extended HE gamma-ray emission with a 0.2-100 GeV spectrum exhibiting no significant deviation from a power law, unlike most of the GeV-emitting SNRs known to be interacting with molecular clouds. This makes it a promising target for imaging atmospheric Cherenkov telescopes (IACTs) to probe the gamma-ray emission above 100 GeV.
Aims. Very-high-energy (VHE, E >= 0.1 TeV) gamma-ray emission from Puppis A has been, for the first time, searched for with the High Energy Stereoscopic System (HESS.).
Methods. Stereoscopic imaging of Cherenkov radiation from extensive air showers is used to reconstruct the direction and energy of the incident gamma-rays in order to produce sky images and source spectra. The profile likelihood method is applied to find constraints on the existence of a potential break or cutoff in the photon spectrum.
Results. The analysis of the HESS. data does not reveal any significant emission towards Puppis A. The derived upper limits on the differential photon flux imply that its broadband gamma-ray spectrum must exhibit a spectral break or cutoff. By combining Fermi-LAT and HESS. measurements, the 99% confidence-level upper limits on such a cutoff are found to be 450 and 280 GeV, assuming a power law with a simple exponential and a sub-exponential cutoff, respectively. It is concluded that none of the standard limitations (age, size, radiative losses) on the particle acceleration mechanism, assumed to be continuing at present, can explain the lack of VHE signal. The scenario in which particle acceleration has ceased some time ago is considered as an alternative explanation. The HE/VHE spectrum of Puppis A could then exhibit a break of non-radiative origin (as observed in several other interacting SNRs, albeit at somewhat higher energies), owing to the interaction with dense and neutral material, in particular towards the NE region.
G349.7+0.2 is a young Galactic supernova remnant (SNR) located at the distance of 11.5 kpc and observed across the entire electromagnetic spectrum from radio to high energy (HE; 0.1 GeV < E < 100 GeV) gamma-rays. Radio and infrared observations indicate that the remnant is interacting with a molecular cloud. In this paper, the detection of very high energy (VHE, E > 100 GeV) gamma-ray emission coincident with this SNR with the High Energy Stereoscopic System (HESS.) is reported. This makes it one of the farthest Galactic SNR ever detected in this domain. An integral flux F(E > 400 GeV) = (6.5 +/- 1.1(stat) +/- 1.3(syst)) x 10-11 ph cm(-2) s(-1) corresponding to similar to 0.7% of that of the Crab Nebula and to a luminosity of similar to 10(34) erg s(-1) above the same energy threshold, and a steep photon index Gamma(VHE) = 2.8 +/- 0.27(stat) +/- 0.20(syst) are measured. The analysis of more than 5 yr of Fermi-LAT data towards this source shows a power-law like spectrum with a best-fit photon index Gamma(HE) = 2.2 +/- 0.04.2(stat-0.31sys)(+0.13), The combined gamma-ray spectrum of 0349.7+0.2 can be described by either a broken power law (I3PL) or a power law with exponential (or sub exponential) cutoff (PLC). In the former case, the photon break energy is found at E-br,E-gamma = 551(-30)(+70) GeV, slightly higher than what is usually observed in the HE/VHE gamma-ray emitting middle-aged SNRs known to be interacting with molecular clouds. In the latter case. the exponential (respectively sub-exponential) cutoff energy is measured at E-cat,E-gamma = 1.4(-0.55)(+1.6) (respectively 0.35(-0.21)(+0.75)) TeV. A pion decay process resulting from the interaction of the accelerated protons and nuclei with the dense surrounding medium is clearly the preferred scenario to explain the gamma-ray emission. The BPL with a spectral steepening of 0.5-1 and the PLC provide equally good fits to the data. The product or the average gas density and the total energy content of accelerated protons and nuclei amounts to nu W-p similar to 5 x 10(51) erg cm(-3)
In this paper we report on the analysis of all the available optical and very high-energy gamma-ray (> 200 GeV) data for the BL Lac object PKS 2155-304, collected simultaneously with the ATOM and H.E.S.S. telescopes from 2007 until 2009. This study also includes X-ray (RXTE, Swift) and high-energy gamma-ray (Fermi-LAT) data. During the period analysed, the source was transitioning from its flaring to quiescent optical states, and was characterized by only moderate flux changes at different wavelengths on the timescales of days and months. A flattening of the optical continuum with an increasing optical flux can be noted in the collected dataset, but only occasionally and only at higher flux levels. We did not find any universal relation between the very high-energy gamma-ray and optical flux changes on the timescales from days and weeks up to several years. On the other hand, we noted that at higher flux levels the source can follow two distinct tracks in the optical flux-colour diagrams, which seem to be related to distinct gamma-ray states of the blazar. The obtained results therefore indicate a complex scaling between the optical and gamma-ray emission of PKS 2155 304, with different correlation patterns holding at different epochs, and a gamma-ray flux depending on the combination of an optical flux and colour rather than a flux alone.
Galactic cosmic rays reach energies of at least a few petaelectronvolts (of the order of 1015 electronvolts). This implies that our Galaxy contains petaelectronvolt accelerators (‘PeVatrons’), but all proposed models of Galactic cosmic-ray accelerators encounter difficulties at exactly these energies. Dozens of Galactic accelerators capable of accelerating particles to energies of tens of teraelectronvolts (of the order of 1013 electronvolts) were inferred from recent γ-ray observations3. However, none of the currently known accelerators—not even the handful of shell-type supernova remnants commonly believed to supply most Galactic cosmic rays—has shown the characteristic tracers of petaelectronvolt particles, namely, power-law spectra of γ-rays extending without a cut-off or a spectral break to tens of teraelectronvolts4. Here we report deep γ-ray observations with arcminute angular resolution of the region surrounding the Galactic Centre, which show the expected tracer of the presence of petaelectronvolt protons within the central 10 parsecs of the Galaxy. We propose that the supermassive black hole Sagittarius A* is linked to this PeVatron. Sagittarius A* went through active phases in the past, as demonstrated by X-ray outbursts5and an outflow from the Galactic Centre6. Although its current rate of particle acceleration is not sufficient to provide a substantial contribution to Galactic cosmic rays, Sagittarius A* could have plausibly been more active over the last 106–107 years, and therefore should be considered as a viable alternative to supernova remnants as a source of petaelectronvolt Galactic cosmic rays.
Re-observations with the HESS telescope array of the very high-energy (VHE) source HESS J1018-589A that is coincident with the Fermi-LAT gamma-ray binary 1FGL J1018.6-5856 have resulted in a source detection significance of more than 9 sigma and the detection of variability (chi(2)/nu of 238.3/155) in the emitted gamma-ray flux. This variability confirms the association of HESS J1018-589A with the high-energy gamma-ray binary detected Fermi-LAT and also confirms the point-like source as a new VHE binary system. The spectrum of HESS J1018-589A is best fit with a power-law function with photon index Gamma = 2.20 +/- 0.14(stat) +/- 0.2(sys). Emission is detected up to similar to 20 TeV. The mean differential flux level is (2.9 +/- 0.4) x 10(-13) TeV-1 cm(-2) s(-1) at 1 TeV, equivalent to similar to 1% of the flux from the Crab Nebula at the same energy. Variability is clearly detected the night-by-night light curve. When folded on the orbital period of 16.58 days, the rebinned light curve peaks in phase with the observed X-ray high-energy phaseograms. The fit of the HESS phaseogram to a constant flux provides evidence of periodicity at the level of N-sigma > 3 sigma. The of the VHE phaseogram and measured spectrum suggest a low-inclination, low-eccentricity system with a modest impact from VHE gamma-ray due to pair production (tau less than or similar to 1 at 300 GeV).
This Letter reports the discovery of a remarkably hard spectrum source, HESS J1641-463, by the High Energy Stereoscopic System (H.E.S.S.) in the very high energy (VHE) domain. HESS J1641-463 remained unnoticed by the usual analysis techniques due to confusion with the bright nearby source HESS J1640-465. It emerged at a significance level of 8.5 standard deviations after restricting the analysis to events with energies above 4 TeV. It shows a moderate flux level of phi(E > 1TeV) = (3.64 +/- 0.44(stat)+/- 0.73(sys)) x 10(-13) cm(-2) s(-1), corresponding to 1.8% of the Crab Nebula flux above the same energy, and a hard spectrum with a photon index of Gamma = 2.07 +/- 0.11(stat)+/- 0.20(sys). It is a point-like source, although an extension up to a Gaussian width of sigma = 3 arcmin cannot be discounted due to uncertainties in the H.E.S.S. point-spread function. The VHE gamma-ray flux of HESS J1641-463 is found to be constant over the observed period when checking time binnings from the year-by-year to the 28 minute exposure timescales. HESS J1641-463 is positionally coincident with the radio supernova remnant SNR G338.5+0.1. No X-ray candidate stands out as a clear association; however, Chandra and XMM-Newton data reveal some potential weak counterparts. Various VHE gamma-ray production scenarios are discussed. If the emission from HESS J1641-463 is produced by cosmic ray protons colliding with the ambient gas, then their spectrum must extend close to 1 PeV. This object may represent a source population contributing significantly to the galactic cosmic ray flux around the knee.
Answer Set Programming (ASP) is a powerful declarative programming paradigm that has been successfully applied to many different domains. Recently, ASP has also proved successful for hard optimization problems like course timetabling and travel allotment. In this paper, we approach another important task, namely, the shift design problem, aiming at an alignment of a minimum number of shifts in order to meet required numbers of employees (which typically vary for different time periods) in such a way that over- and understaffing is minimized. We provide an ASP encoding of the shift design problem, which, to the best of our knowledge, has not been addressed by ASP yet. Our experimental results demonstrate that ASP is capable of improving the best known solutions to some benchmark problems. Other instances remain challenging and make the shift design problem an interesting benchmark for ASP-based optimization methods.
Digital inclusion
(2021)
In this thesis, we tackle two social disruptions: recent refugee waves in Germany and the COVID-19 pandemic. We focus on the use of information and communication technology (ICT) as a key means of alleviating these disruptions and promoting social inclusion. As social disruptions typically lead to frustration and fragmentation, it is essential to ensure the social inclusion of individuals and societies during such times.
In the context of the social inclusion of refugees, we focus on the Syrian refugees who arrived in Germany as of 2015, as they form a large and coherent refugee community. In particular, we address the role of ICTs in refugees’ social inclusion and investigate how different ICTs (especially smartphones and social networks) can foster refugees’ integration and social inclusion. In the context of the COVID-19 pandemic, we focus on the widespread unconventional working model of work from home (WFH). Our research here centers on the main constructs of WFH and the key differences in WFH experiences based on personal characteristics such as gender and parental status.
We reveal novel insights through four well-established research methods: literature review, mixed methods, qualitative method, and quantitative method. The results of our research have been published in the form of eight articles in major information systems venues and journals. Key results from the refugee research stream include the following: Smartphones represent a central component of refugee ICT use; refugees view ICT as a source of information and power; the social connectedness of refugees is strongly correlated with their Internet use; refugees are not relying solely on traditional methods to learn the German language or pursue further education; the ability to use smartphones anytime and anywhere gives refugees an empowering feeling of global connectedness; and ICTs empower refugees on three levels (community participation, sense of control, and self-efficacy).
Key insights from the COVID-19 WFH stream include: Gender and the presence of children under the age of 18 affect workers’ control over their time, technology usefulness, and WFH conflicts, while not affecting their WFH attitudes; and both personal and technology-related factors affect an individual’s attitude toward WFH and their productivity. Further insights are being gathered at the time of submitting this thesis.
This thesis contributes to the discussion within the information systems community regarding how to use different ICT solutions to promote the social inclusion of refugees in their new communities and foster an inclusive society. It also adds to the growing body of research on COVID-19, in particular on the sudden workplace transformation to WFH. The insights gathered in this thesis reveal theoretical implications and future opportunities for research in the field of information systems, practical implications for relevant stakeholders, and social implications related to the refugee crisis and the COVID-19 pandemic that must be addressed.
Immigrant integration has become a primary political concern for leaders in Germany and the United States. The information systems (IS) community has begun to research how information and communications technologies can assist immigrants and refugees, such as by examining how countries can facilitate social-inclusion processes. Migrants face the challenge of joining closed communities that cannot integrate or fear doing so. We conducted a panel discussion at the 2019 Americas Conference on Information Systems (AMCIS) in Cancun, Mexico, to introduce multiple viewpoints on immigration. In particular, the panel discussed how technology can both support and prevent immigrants from succeeding in their quest. We conducted the panel to stimulate a thoughtful and dynamic discussion on best practices and recommendations to enhance the discipline's impact on alleviating the challenges that occur for immigrants in their host countries. In this panel report, we introduce the topic of using ICT to help immigrants integrate and identify differences between North/Central America and Europe. We also discuss how immigrants (particularly refugees) use ICT to connect with others, feel that they belong, and maintain their identity. We also uncover the dark and bright sides of how governments use ICT to deter illegal immigration. Finally, we present recommendations for researchers and practitioners on how to best use ICT to assist with immigration.
The coronavirus disease of 2019 (COVID-19) pandemic has forced most academics to work from home. This sudden venue change can affect academics' productivity and exacerbate the challenges that confront universities as they face an uncertain future. In this paper, we identify factors that influence academics' productivity while working from home during the mandate to self-isolate. From analyzing results from a global survey we conducted, we found that both personal and technology-related factors affect an individual's attitude toward working from home and productivity. Our results should prove valuable to university administrators to better address the work-life challenges that academics face.
Since the beginning of the recent global refugee crisis, researchers have been tackling many of its associated aspects, investigating how we can help to alleviate this crisis, in particular, using ICTs capabilities. In our research, we investigated the use of ICT solutions by refugees to foster the social inclusion process in the host community. To tackle this topic, we conducted thirteen interviews with Syrian refugees in Germany. Our findings reveal different ICT usages by refugees and how these contribute to feeling empowered. Moreover, we show the sources of empowerment for refugees that are gained by ICT use. Finally, we identified the two types of social inclusion benefits that were derived from empowerment sources. Our results provide practical implications to different stakeholders and decision-makers on how ICT usage can empower refugees, which can foster the social inclusion of refugees, and what should be considered to support them in their integration effort.
Since the beginning of the recent global refugee crisis, researchers have been tackling many of its associated aspects, investigating how we can help to alleviate this crisis, in particular, using ICTs capabilities. In our research, we investigated the use of ICT solutions by refugees to foster the social inclusion process in the host community. To tackle this topic, we conducted thirteen interviews with Syrian refugees in Germany. Our findings reveal different ICT usages by refugees and how these contribute to feeling empowered. Moreover, we show the sources of empowerment for refugees that are gained by ICT use. Finally, we identified the two types of social inclusion benefits that were derived from empowerment sources. Our results provide practical implications to different stakeholders and decision-makers on how ICT usage can empower refugees, which can foster the social inclusion of refugees, and what should be considered to support them in their integration effort.
Focus presuppositions
(2007)
This paper reviews notions related to focus and presupposition and addresses the hypothesis that focus triggers an existential presupposition. Presupposition projection behavior in certain examples appears to favor a presuppositional analysis of focus. It is argued that these examples are open to a different analysis using givenness theory. Overall, the analysis favors a weak semantics for focus not including an existential presupposition.
Extract: Topics in psycholinguistics and the neurocognition of language rarely attract the attention of journalists or the general public. One topic that has done so, however, is the potential benefits of bilingualism for general cognitive functioning and development, and as a precaution against cognitive decline in old age. Sensational claims have been made in the public domain, mostly by journalists and politicians. Recently (September 4, 2014) The Guardian reported that “learning a foreign language can increase the size of your brain”, and Michael Gove, the UK's previous Education Secretary, noted in an interview with The Guardian (September 30, 2011) that “learning languages makes you smarter”. The present issue of BLC addresses these topics by providing a state-of-the-art overview of theoretical and experimental research on the role of bilingualism for cognition in children and adults.
Extract: Topics in psycholinguistics and the neurocognition of language rarely attract the attention of journalists or the general public. One topic that has done so, however, is the potential benefits of bilingualism for general cognitive functioning and development, and as a precaution against cognitive decline in old age. Sensational claims have been made in the public domain, mostly by journalists and politicians. Recently (September 4, 2014) The Guardian reported that “learning a foreign language can increase the size of your brain”, and Michael Gove, the UK's previous Education Secretary, noted in an interview with The Guardian (September 30, 2011) that “learning languages makes you smarter”. The present issue of BLC addresses these topics by providing a state-of-the-art overview of theoretical and experimental research on the role of bilingualism for cognition in children and adults.
Giant X-ray outbursts, with luminosities of about 10(37) erg s(-1), are observed roughly every five years from the nearby Be/pulsar binary 1A 0535+262. In this article, we present observations of the source with VERITAS at very high energies (VHEs; E > 100 GeV) triggered by the X-ray outburst in 2009 December. The observations started shortly after the onset of the outburst and provided comprehensive coverage of the episode, as well as the 111 day binary orbit. No VHE emission is evident at any time. We also examined data from the contemporaneous observations of 1A 0535+262 with the Fermi/Large Area Telescope at high-energy photons (E > 0.1 GeV) and failed to detect the source at GeV energies. The X-ray continua measured with the Swift/X-Ray Telescope and the RXTE/PCA can be well described by the combination of blackbody and Comptonized emission from thermal electrons. Therefore, the gamma-ray and X-ray observations suggest the absence of a significant population of non-thermal particles in the system. This distinguishes 1A 0535+262 from those Be X-ray binaries (such as PSR B1259-63 and LS I +61 degrees 303) that have been detected at GeV-TeV energies. We discuss the implications of the results on theoretical models.
We present the results of 16 Swift-triggered Gamma-ray burst (GRB) follow-up observations taken with the Very Energetic Radiation Imaging Telescope Array System (VERITAS) telescope array from 2007 January to 2009 June. The median energy threshold and response time of these observations were 260 GeV and 320 s, respectively. Observations had an average duration of 90 minutes. Each burst is analyzed independently in two modes: over the whole duration of the observations and again over a shorter timescale determined by the maximum VERITAS sensitivity to a burst with a t(-1.5) time profile. This temporal model is characteristic of GRB afterglows with high-energy, long-lived emission that have been detected by the Large Area Telescope on board the Fermi satellite. No significant very high energy (VHE) gamma-ray emission was detected and upper limits above the VERITAS threshold energy are calculated. The VERITAS upper limits are corrected for gamma-ray extinction by the extragalactic background light and interpreted in the context of the keV emission detected by Swift. For some bursts the VHE emission must have less power than the keV emission, placing constraints on inverse Compton models of VHE emission.
We present the results of observations of the TeV binary LS I + 61 degrees 303 with the VERITAS telescope array between 2008 and 2010, at energies above 300 GeV. In the past, both ground-based gamma-ray telescopes VERITAS and MAGIC have reported detections of TeV emission near the apastron phases of the binary orbit. The observations presented here show no strong evidence for TeV emission during these orbital phases; however, during observations taken in late 2010, significant emission was detected from the source close to the phase of superior conjunction (much closer to periastron passage) at a 5.6 standard deviation (5.6 sigma) post-trials significance. In total, between 2008 October and 2010 December a total exposure of 64.5 hr was accumulated with VERITAS on LS I + 61 degrees 303, resulting in an excess at the 3.3 sigma significance level for constant emission over the entire integrated data set. The flux upper limits derived for emission during the previously reliably active TeV phases (i.e., close to apastron) are less than 5% of the Crab Nebula flux in the same energy range. This result stands in apparent contrast to previous observations by both MAGIC and VERITAS which detected the source during these phases at 10% of the Crab Nebula flux. During the two year span of observations, a large amount of X-ray data were also accrued on LS I + 61 degrees 303 by the Swift X-ray Telescope and the Rossi X-ray Timing Explorer Proportional Counter Array. We find no evidence for a correlation between emission in the X-ray and TeV regimes during 20 directly overlapping observations. We also comment on data obtained contemporaneously by the Fermi Large Area Telescope.
We report the discovery of TeV gamma-ray emission from the Type Ia supernova remnant (SNR) G120.1+1.4, known as Tycho's SNR. Observations performed in the period 2008-2010 with the VERITAS ground-based gamma-ray observatory reveal weak emission coming from the direction of the remnant, compatible with a point source located at 00(h)25(m)27(s).0, +64 degrees 10'50 '' (J2000). The TeV photon spectrum measured by VERITAS can be described with a power law dN/dE = C(E/3.42 TeV)(-Gamma) with Gamma = 1.95 +/- 0.51(stat) +/- 0.30(sys) and C = (1.55 +/- 0.43(stat) +/- 0.47(sys)) x 10(-14) cm(-2) s(-1) TeV-1. The integral flux above 1 TeV corresponds to similar to 0.9% of the steady Crab Nebula emission above the same energy, making it one of the weakest sources yet detected in TeV gamma rays. We present both leptonic and hadronic models that can describe the data. The lowest magnetic field allowed in these models is similar to 80 mu G, which may be interpreted as evidence for magnetic field amplification.
The variability of the blazar Markarian 421 in TeV gamma rays over a 14-year time period has been explored with the Whipple 10 m telescope. It is shown that the dynamic range of its flux variations is large and similar to that in X-rays. A correlation between the X-ray and TeV energy bands is observed during some bright flares and when the complete data sets are binned on long timescales. The main database consists of 878.4 h of observation with the Whipple telescope, spread over 783 nights. The peak energy response of the telescope was 400 GeV with 20% uncertainty. This is the largest database of any TeV-emitting active galactic nucleus (AGN) and hence was used to explore the variability profile of Markarian 421. The tithe-averaged flux from Markarian 421 over this period was 0.446 +/- 0.008 Crab flux units. The flux exceeded 10 Crab flux units on three separate occasions. For the 2000-2001 season the average flux reached 1.86 Crab units, while in the 1996-1997 season the average flux was only 0.23 Crab units.
Prospects for Cherenkov Telescope Array Observations of the Young Supernova Remnant RX J1713.7-3946
(2017)
We perform simulations for future Cherenkov Telescope Array (CTA) observations of RX J1713.7-3946, a young supernova remnant (SNR) and one of the brightest sources ever discovered in very high energy (VHE) gamma rays. Special attention is paid to exploring possible spatial (anti) correlations of gamma rays with emission at other wavelengths, in particular X-rays and CO/H I emission. We present a series of simulated images of RX J1713.7-3946 for CTA based on a set of observationally motivated models for the gamma-ray emission. In these models, VHE gamma rays produced by high-energy electrons are assumed to trace the nonthermal X-ray emission observed by XMM-Newton, whereas those originating from relativistic protons delineate the local gas distributions. The local atomic and molecular gas distributions are deduced by the NANTEN team from CO and H I observations. Our primary goal is to show how one can distinguish the emission mechanism(s) of the gamma rays (i.e., hadronic versus leptonic, or a mixture of the two) through information provided by their spatial distribution, spectra, and time variation. This work is the first attempt to quantitatively evaluate the capabilities of CTA to achieve various proposed scientific goals by observing this important cosmic particle accelerator.
Particle filters (also called sequential Monte Carlo methods) are widely used for state and parameter estimation problems in the context of nonlinear evolution equations. The recently proposed ensemble transform particle filter (ETPF) [S. Reich, SIAM T. Sci. Comput., 35, (2013), pp. A2013-A2014[ replaces the resampling step of a standard particle filter by a linear transformation which allows for a hybridization of particle filters with ensemble Kalman filters and renders the resulting hybrid filters applicable to spatially extended systems. However, the linear transformation step is computationally expensive and leads to an underestimation of the ensemble spread for small and moderate ensemble sizes. Here we address both of these shortcomings by developing second order accurate extensions of the ETPF. These extensions allow one in particular to replace the exact solution of a linear transport problem by its Sinkhorn approximation. It is also demonstrated that the nonlinear ensemble transform filter arises as a special case of our general framework. We illustrate the performance of the second-order accurate filters for the chaotic Lorenz-63 and Lorenz-96 models and a dynamic scene-viewing model. The numerical results for the Lorenz-63 and Lorenz-96 models demonstrate that significant accuracy improvements can be achieved in comparison to a standard ensemble Kalman filter and the ETPF for small to moderate ensemble sizes. The numerical results for the scene-viewing model reveal, on the other hand, that second-order corrections can lead to statistically inconsistent samples from the posterior parameter distribution.
Assimilation of pseudo-tree-ring-width observations into an atmospheric general circulation model
(2017)
Paleoclimate data assimilation (DA) is a promising technique to systematically combine the information from climate model simulations and proxy records. Here, we investigate the assimilation of tree-ring-width (TRW) chronologies into an atmospheric global climate model using ensemble Kalman filter (EnKF) techniques and a process-based tree-growth forward model as an observation operator. Our results, within a perfect-model experiment setting, indicate that the "online DA" approach did not outperform the "off-line" one, despite its considerable additional implementation complexity. On the other hand, it was observed that the nonlinear response of tree growth to surface temperature and soil moisture does deteriorate the operation of the time-averaged EnKF methodology. Moreover, for the first time we show that this skill loss appears significantly sensitive to the structure of the growth rate function, used to represent the principle of limiting factors (PLF) within the forward model. In general, our experiments showed that the error reduction achieved by assimilating pseudo-TRW chronologies is modulated by the magnitude of the yearly internal variability in themodel. This result might help the dendrochronology community to optimize their sampling efforts.
Assimilation of pseudo-tree-ring-width observations into an atmospheric general circulation model
(2017)
Paleoclimate data assimilation (DA) is a promising technique to systematically combine the information from climate model simulations and proxy records. Here, we investigate the assimilation of tree-ring-width (TRW) chronologies into an atmospheric global climate model using ensemble Kalman filter (EnKF) techniques and a process-based tree-growth forward model as an observation operator. Our results, within a perfect-model experiment setting, indicate that the "online DA" approach did not outperform the "off-line" one, despite its considerable additional implementation complexity. On the other hand, it was observed that the nonlinear response of tree growth to surface temperature and soil moisture does deteriorate the operation of the time-averaged EnKF methodology. Moreover, for the first time we show that this skill loss appears significantly sensitive to the structure of the growth rate function, used to represent the principle of limiting factors (PLF) within the forward model. In general, our experiments showed that the error reduction achieved by assimilating pseudo-TRW chronologies is modulated by the magnitude of the yearly internal variability in themodel. This result might help the dendrochronology community to optimize their sampling efforts.
Towards the assimilation of tree-ring-width records using ensemble Kalman filtering techniques
(2015)
This paper investigates the applicability of the Vaganov–Shashkin–Lite (VSL) forward model for tree-ring-width chronologies as observation operator within a proxy data assimilation (DA) setting. Based on the principle of limiting factors, VSL combines temperature and moisture time series in a nonlinear fashion to obtain simulated TRW chronologies. When used as observation operator, this modelling approach implies three compounding, challenging features: (1) time averaging, (2) “switching recording” of 2 variables and (3) bounded response windows leading to “thresholded response”. We generate pseudo-TRW observations from a chaotic 2-scale dynamical system, used as a cartoon of the atmosphere-land system, and attempt to assimilate them via ensemble Kalman filtering techniques. Results within our simplified setting reveal that VSL’s nonlinearities may lead to considerable loss of assimilation skill, as compared to the utilization of a time-averaged (TA) linear observation operator. In order to understand this undesired effect, we embed VSL’s formulation into the framework of fuzzy logic (FL) theory, which thereby exposes multiple representations of the principle of limiting factors. DA experiments employing three alternative growth rate functions disclose a strong link between the lack of smoothness of the growth rate function and the loss of optimality in the estimate of the TA state. Accordingly, VSL’s performance as observation operator can be enhanced by resorting to smoother FL representations of the principle of limiting factors. This finding fosters new interpretations of tree-ring-growth limitation processes.
Towards the assimilation of tree-ring-width records using ensemble Kalman filtering techniques
(2016)
This paper investigates the applicability of the Vaganov–Shashkin–Lite (VSL) forward model for tree-ring-width chronologies as observation operator within a proxy data assimilation (DA) setting. Based on the principle of limiting factors, VSL combines temperature and moisture time series in a nonlinear fashion to obtain simulated TRW chronologies. When used as observation operator, this modelling approach implies three compounding, challenging features: (1) time averaging, (2) “switching recording” of 2 variables and (3) bounded response windows leading to “thresholded response”. We generate pseudo-TRW observations from a chaotic 2-scale dynamical system, used as a cartoon of the atmosphere-land system, and attempt to assimilate them via ensemble Kalman filtering techniques. Results within our simplified setting reveal that VSL’s nonlinearities may lead to considerable loss of assimilation skill, as compared to the utilization of a time-averaged (TA) linear observation operator. In order to understand this undesired effect, we embed VSL’s formulation into the framework of fuzzy logic (FL) theory, which thereby exposes multiple representations of the principle of limiting factors. DA experiments employing three alternative growth rate functions disclose a strong link between the lack of smoothness of the growth rate function and the loss of optimality in the estimate of the TA state. Accordingly, VSL’s performance as observation operator can be enhanced by resorting to smoother FL representations of the principle of limiting factors. This finding fosters new interpretations of tree-ring-growth limitation processes.
Introducing the CTA concept
(2013)
The Cherenkov Telescope Array (CTA) is a new observatory for very high-energy (VHE) gamma rays. CTA has ambitions science goals, for which it is necessary to achieve full-sky coverage, to improve the sensitivity by about an order of magnitude, to span about four decades of energy, from a few tens of GeV to above 100 TeV with enhanced angular and energy resolutions over existing VHE gamma-ray observatories. An international collaboration has formed with more than 1000 members from 27 countries in Europe, Asia, Africa and North and South America. In 2010 the CTA Consortium completed a Design Study and started a three-year Preparatory Phase which leads to production readiness of CTA in 2014. In this paper we introduce the science goals and the concept of CTA, and provide an overview of the project.
Supernova remnants (SNRs) are among the most important targets for gamma-ray observatories. Being prominent non-thermal sources, they are very likely responsible for the acceleration of the bulk of Galactic cosmic rays (CRS). To firmly establish the SNR paradigm for the origin of cosmic rays, it should be confirmed that protons are indeed accelerated in, and released from, SNRs with the appropriate flux and spectrum. This can be done by detailed theoretical models which account for microphysics of acceleration and various radiation processes of hadrons and leptons. The current generation of Cherenkov telescopes has insufficient sensitivity to constrain theoretical models. A new facility, the Cherenkov Telescope Array (CTA), will have superior capabilities and may finally resolve this long standing issue of high-energy astrophysics. We want to assess the capabilities of CTA to reveal the physics of various types of SNRs in the initial 2000 years of their evolution. During this time, the efficiency to accelerate cosmic rays is highest. We perform time-dependent simulations of the hydrodynamics, the magnetic fields, the cosmic-ray acceleration, and the non-thermal emission for type Ia, Ic and IIP SNRs. We calculate the CTA response to the y-ray emission from these SNRs for various ages and distances, and we perform a realistic analysis of the simulated data. We derive distance limits for the detectability and resolvability of these SNR types at several ages. We test the ability of CTA to reconstruct their morphological and spectral parameters as a function of their distance. Finally, we estimate how well CTA data will constrain the theoretical models. (C) 2014 Elsevier B.V. All rights reserved.
Apraxia typically results from left-hemispheric (LH), but also from right-hemispheric (RH) stroke, and often impairs gesture imitation. Especially in LH stroke, it is important to differentiate apraxia-induced gesture imitation deficits from those due to co-morbid aphasia and associated semantic deficits, possibly influencing the imitation of meaningful (MF) gestures. To explore this issue, we first investigated if the 10 supposedly meaningless (ML) gestures of a widely used finger imitation test really carry no meaning, or if the test also contains MF gestures, by asking healthy subjects (n=45) to classify these gestures as MF or ML. Most healthy subjects (98%) classified three of the 10 gestures as clearly MF. Only two gestures were considered predominantly ML. We next assessed how imitation in stroke patients (255 LH, 113 RH stroke) is influenced by gesture meaning and how aphasia influences imitation of LH stroke patients (n=208). All patients and especially patients with imitation deficits (17% of LH, 27% of RH stroke patients) imitated MF gestures significantly better than ML gestures. Importantly, meaningfulness-scores of all 10 gestures significantly predicted imitation scores of patients with imitation deficits. Furthermore, especially in LH stroke patients with imitation deficits, the severity of aphasia significantly influenced the imitation of MF, but not ML gestures. Our findings in a large patient cohort support current cognitive models of imitation and strongly suggest that ML gestures are particularly sensitive to detect imitation deficits while minimising confounding effects of aphasia which affect the imitation of MF gestures in LH stroke patients. (C) 2015 Elsevier Ltd. All rights reserved.
Dynamic causal links between the russian stock exchange and selected international stock markets
(2004)
The origin of Galactic cosmic rays is a century-long puzzle. Indirect evidence points to their acceleration by supernova shockwaves, but we know little of their escape from the shock and their evolution through the turbulent medium surrounding massive stars. Gamma rays can probe their spreading through the ambient gas and radiation fields. The Fermi Large Area Telescope (LAT) has observed the star-forming region of Cygnus X. The 1- to 100-gigaelectronvolt images reveal a 50-parsec-wide cocoon of freshly accelerated cosmic rays that flood the cavities carved by the stellar winds and ionization fronts from young stellar clusters. It provides an example to study the youth of cosmic rays in a superbubble environment before they merge into the older Galactic population.
Personal data increasingly serve as inputs to public goods. Like other types of contributions to public goods, personal data are likely to be underprovided. We investigate whether classical remedies to underprovision are also applicable to personal data and whether the privacy-sensitive nature of personal data must be additionally accounted for. In a randomized field experiment on a public online education platform, we prompt users to complete their profiles with personal information. Compared to a control message, we find that making public benefits salient increases the number of personal data contributions significantly. This effect is even stronger when additionally emphasizing privacy protection, especially for sensitive information. Our results further suggest that emphasis on both public benefits and privacy protection attracts personal data from a more diverse set of contributors.
The mechanisms by which climate and vegetation affect erosion rates over various time scales lie at the heart of understanding landscape response to climate change. Plot-scale field experiments show that increased vegetation cover slows erosion, implying that faster erosion should occur under low to moderate vegetation cover. However, demonstrating this concept over long time scales and across landscapes has proven to be difficult, especially in settings complicated by tectonic forcing and variable slopes. We investigate this problem by measuring cosmogenic Be-10-derived catchment-mean denudation rates across a range of climate zones and hillslope gradients in the Kenya Rift, and by comparing our results with those published from the Rwenzori Mountains of Uganda. We find that denudation rates from sparsely vegetated parts of the Kenya Rift are up to 0.13 mm/yr, while those from humid and more densely vegetated parts of the Kenya Rift flanks and the Rwenzori Mountains reach a maximum of 0.08 mm/yr, despite higher median hillslope gradients. While differences in lithology and recent land-use changes likely affect the denudation rates and vegetation cover values in some of our studied catchments, hillslope gradient and vegetation cover appear to explain most of the variation in denudation rates across the study area. Our results support the idea that changing vegetation cover can contribute to complex erosional responses to climate or land-use change and that vegetation cover can play an important role in determining the steady-state slopes of mountain belts through its stabilizing effects on the land surface.
Ground-based gamma-ray astronomy has had a major breakthrough with the impressive results obtained using systems of imaging atmospheric Cherenkov telescopes. Ground-based gamma-ray astronomy has a huge potential in astrophysics, particle physics and cosmology. CTA is an international initiative to build the next generation instrument, with a factor of 5-10 improvement in sensitivity in the 100 GeV-10 TeV range and the extension to energies well below 100 GeV and above 100 TeV. CTA will consist of two arrays (one in the north, one in the south) for full sky coverage and will be operated as open observatory. The design of CTA is based on currently available technology. This document reports on the status and presents the major design concepts of CTA.
This article considers Isabella Bird’s representation of medicine in Unbeaten Tracks in Japan (1880) and Journeys in Persia and Kurdistan (1891), the two books in which she engages most extensively with both local (Chinese/Islamic) and Western medical science and practice. I explore how Bird uses medicine to assert her narrative authority and define her travelling persona in opposition to local medical practitioners. I argue that her ambivalence and the unease she frequently expresses concerning medical practice (expressed particularly in her later adoption of the Persian appellation “Feringhi Hakīm” [European physician] to describe her work) serves as a means for her to negotiate the colonial and gendered pressures on Victorian medicine. While in Japan this attitude works to destabilise her hierarchical understanding of science and results in some acknowledgement of traditional Japanese traditions, in Persia it functions more to disguise her increasing collusion with overt British colonial ambitions.
Beyond humanitarianism
(2022)
The closer the better
(2012)
A growing literature has suggested that processing of visual information presented near the hands is facilitated. In this study, we investigated whether the near-hands superiority effect also occurs with the hands moving. In two experiments, participants performed a cyclical bimanual movement task requiring concurrent visual identification of briefly presented letters. For both the static and dynamic hand conditions, the results showed improved letter recognition performance with the hands closer to the stimuli. The finding that the encoding advantage for near-hand stimuli also occurred with the hands moving suggests that the effect is regulated in real time, in accordance with the concept of a bimodal neural system that dynamically updates hand position in external space.
A growing literature has suggested that processing of visual information presented near the hands is facilitated. In this study, we investigated whether the near-hands superiority effect also occurs with the hands moving. In two experiments, participants performed a cyclical bimanual movement task requiring concurrent visual identification of briefly presented letters. For both the static and dynamic hand conditions, the results showed improved letter recognition performance with the hands closer to the stimuli. The finding that the encoding advantage for near-hand stimuli also occurred with the hands moving suggests that the effect is regulated in real time, in accordance with the concept of a bimodal neural system that dynamically updates hand position in external space.
When infants observe a human grasping action, experience-based accounts predict that all infants familiar with grasping actions should be able to predict the goal regardless of additional agency cues such as an action effect. Cue-based accounts, however, suggest that infants use agency cues to identify and predict action goals when the action or the agent is not familiar. From these accounts, we hypothesized that younger infants would need additional agency cues such as a salient action effect to predict the goal of a human grasping action, whereas older infants should be able to predict the goal regardless of agency cues. In three experiments, we presented 6-, 7-, and 11-month-olds with videos of a manual grasping action presented either with or without an additional salient action effect (Exp. 1 and 2), or we presented 7-month-olds with videos of a mechanical claw performing a grasping action presented with a salient action effect (Exp. 3). The 6-month-olds showed tracking gaze behavior, and the 11-month-olds showed predictive gaze behavior, regardless of the action effect. However, the 7-month-olds showed predictive gaze behavior in the action-effect condition, but tracking gaze behavior in the no-action-effect condition and in the action-effect condition with a mechanical claw. The results therefore support the idea that salient action effects are especially important for infants' goal predictions from 7 months on, and that this facilitating influence of action effects is selective for the observation of human hands.
Action effects have been stated to be important for infants’ processing of goal-directed actions. In this study, 11-month-olds showed equally fast predictive gaze shifts to a claw’s action goal when the grasping action was presented either with three agency cues (self-propelled movement, equifinality of goal achievement and a salient action effect) or with only a salient action effect, but infants showed tracking gaze when the claw showed only self-propelled movement and equifinality of goal achievement. The results suggest that action effects, compared to purely kinematic cues, seem to be especially important for infants' online processing of goal-directed actions.
During the observation of goal-directed actions, infants usually predict the goal at an earlier age when the agent is familiar (e.g., human hand) compared to unfamiliar (e.g., mechanical claw). These findings implicate a crucial role of the developing agentive self for infants' processing of others' action goals. Recent theoretical accounts suggest that predictive gaze behavior relies on an interplay between infants' agentive experience (top-down processes) and perceptual information about the agent and the action-event (bottom-up information; e.g., agency cues). The present study examined 7-, 11-, and 18-month-old infants' predictive gaze behavior for a grasping action performed by an unfamiliar tool, depending on infants' age-related action knowledge about tool-use and the display of the agency cue of producing a salient action effect. The results are in line with the notion of a systematic interplay between experience-based top-down processes and cue-based bottom-up information: Regardless of the salient action effect, predictive gaze shifts did not occur in the 7-month-olds (least experienced age group), but did occur in the 18-month-olds (most experienced age group). In the 11-month-olds, however, predictive gaze shifts occurred only when a salient action effect was presented. This sheds new light on how the developing agentive self, in interplay with available agency cues, supports infants' action-goal prediction also for observed tool-use actions.
For the processing of goal-directed actions, some accounts emphasize the importance of experience with the action or the agent. Other accounts stress the importance of agency cues. We investigated the impact of agency cues on 11-month-olds’ and adults’ goal anticipation for a grasping-action performed by a mechanical claw. With an eyetracker, we measured anticipations in two conditions, where the claw was displayed either with or without agency cues. In two experiments, 11-month-olds were predictive when agency cues were present, but reactive when no agency cues were presented. Adults were predictive in both conditions. Furthermore, 11-month-olds rapidly learned to predict the goal in the agency condition, but not in the mechanical condition. Adults’ predictions did not change across trials in the agency condition, but decelerated in the mechanical condition. Thus, agency cues and own action experience are important for infants’ and adults’ online processing of goal-directed actions by non-human agents.