Refine
Has Fulltext
- yes (52) (remove)
Year of publication
- 2002 (52) (remove)
Document Type
- Preprint (28)
- Doctoral Thesis (14)
- Postprint (6)
- Habilitation Thesis (2)
- Monograph/Edited Volume (1)
- Master's Thesis (1)
Language
- English (52) (remove)
Keywords
- conormal symbol (3)
- relative index (3)
- Atiyah-Bott obstruction (2)
- edge-degenerate operators (2)
- elliptic families (2)
- elliptic family (2)
- elliptic operators (2)
- 'Peer To Peer' (1)
- (co)boundary operator (1)
- Adipozyt (1)
- Aggression (1)
- American Indians (1)
- Anden (1)
- Anden / Störung <Geologie> / Strukturgeologie / Magnetotellurik / Chile <Nord> (1)
- Andes (1)
- Ausreisser (1)
- Belletristik (1)
- Bioelektrokatalytisches Recycling (1)
- Biokatalytisches Recyc (1)
- Biosensor (1)
- Bistability (1)
- Bistabilität (1)
- Boundary value problems (1)
- Brandenburg (1)
- Brasilien (1)
- Brazil (1)
- Cactus (1)
- Ceará / Semiarides Gebiet / Wasserreserve / Hydrologie / Mathematisches Modell (1)
- Christentum (1)
- Christianisierung (1)
- Christianity (1)
- Christianization (1)
- D'Ar (1)
- D'Arcy McNickle (1)
- Depression (1)
- Diasporenmorphologie (1)
- Differenzierung (1)
- Dispersionsrelationen (1)
- Distributed Computing (1)
- Dreissena polymorpha (1)
- Emotion Regulation (1)
- Emotionsregulation (1)
- Enzymelektrode ; Monophenolmonooxygenase (1)
- Epizoochorie (1)
- Fag (1)
- Fagus syl (1)
- Fault architecture (1)
- Fettzelle (1)
- Genexpression (1)
- Globus (1)
- Glucosedehydrogenase (1)
- Green operator (1)
- Grid (1)
- Grid Computing (1)
- Hochdruck (1)
- Honey bee (1)
- Hydrologie (1)
- Infants (1)
- Junge Mutter / Kind / Aggressivität / Risikoverhalten (1)
- Kleinkinder (1)
- Klimaänderung (1)
- Kolonialisierung (1)
- Kristallstruktur (1)
- Labradorsee ; Thermohaline Konvektion ; Stochastisches Modell (1)
- Lehrer (1)
- Literatur der Indianer Nordamerikas (1)
- Loop-Quantengravitation (1)
- MDS (1)
- MHD ; Röntgenstrahlung ; Jets ; AGN ; Mikro-Quasare (1)
- MHD ; X-rays ; Jets ; AGN ; Microquasars (1)
- Magnetotelluric (1)
- Magnetotellurik (1)
- Meromorphic operator functions (1)
- Microarray (1)
- Migration (1)
- Mother-Child Interaction (1)
- Mutter-Kind Interaktion (1)
- N. Scott Momad (1)
- NE Germany (1)
- Native American literature (1)
- Natural Regions (1)
- Naturräume (1)
- Negative Emotionality (1)
- Negative Emotionalität (1)
- Nichtlineare Dynamik (1)
- Niederschlag-Abfluss-Modellierung (1)
- Noise-induced phenomena (1)
- Nonlinear dynamics (1)
- Nordatlantik (1)
- North Atlantic (1)
- Oxadiazolderivate ; Kristallstruktur ; Hochdruck ; UV-VIS-Spektroskopie ; Raman-Spektroskopie (1)
- PUFA (1)
- Paralleles Rechnen (1)
- Peer-to-Peer-Netz ; GRID computing ; Zuverlässigkeit ; Web Services ; Betriebsmittelverwaltung ; Migration (1)
- Perron's method (1)
- Phenol (1)
- Physiologie-basierte Modelle (1)
- Phänologie (1)
- Preadipozyt (1)
- Quantengravitation (1)
- Raman Streuung (1)
- Raman scattering (1)
- Rauschen (1)
- Rauschinduzierte Phänomene (1)
- Recyclingsystem (1)
- Regressionsanalysen (1)
- Reh (1)
- Religion (1)
- Religiosität (1)
- Riemann-Roch theorem (1)
- Romane (1)
- Schulbindung (1)
- Schulen (1)
- Schüler (1)
- Seitenverschiebung (1)
- Sobolev problem (1)
- Spawning (1)
- Stochastic dynamical systems (1)
- Stochastische Prozesse (1)
- Stochastische Resonanz (1)
- Stochastische dynamische Systeme (1)
- Strike-slip fault (1)
- Störungsbau (1)
- Säugetiere ; Fettgewebe ; Zelldifferenzierung ; Genexpression (1)
- TSL (1)
- Themisch-Stimulierte Lumineszenz (1)
- Thermally stimulated luminescence (1)
- Trends (1)
- Trendwendepunkte (1)
- Trockengebiet (1)
- Tyrosinase (1)
- Tyrosinaseinhibitoren (1)
- UV-Vis Spektroskopie (1)
- UV-Vis spectroscopy (1)
- Unsicherheit (1)
- Unsicherheiten (1)
- Variabilität (1)
- Verteiltes Rechnen (1)
- Verteilungen von lokalisierten Zustände (1)
- Viscosity solutions (1)
- Volterra symbols (1)
- Waldbodenpflanzen (1)
- Wasserverfügbarkeit (1)
- Werte (1)
- Werteerziehung (1)
- Werteprioritäten (1)
- West Fault Zone (1)
- Wildschwein (1)
- Zustandsgleichung (1)
- adaptiv (1)
- adaptive (1)
- adipocyte (1)
- amerikanische Ureinwohner (1)
- biocatalytic recycling (1)
- bioelectrocatalytic recycling (1)
- biogenic amines (1)
- biosensor (1)
- boundary value problems (1)
- braunes Fettgewebe (1)
- brown adipose tissue (1)
- bundles (1)
- climate change (1)
- colonization (1)
- combined time series (1)
- compressible Euler equations (1)
- connections (1)
- coupled solution (1)
- crystal structure (1)
- diaspore morphology (1)
- differentiation (1)
- dispersion relations (1)
- distributions of localised states (1)
- division algebras (1)
- drylands (1)
- dynamic (1)
- dynamisch (1)
- edge symbol (1)
- electrical conductivity (1)
- elektrische Leitfähigkeit (1)
- elliptic morphism (1)
- epizoochory (1)
- equation of state (1)
- exterior tensor product (1)
- fatty acid (1)
- fibre coordinates (1)
- fiction (1)
- food quality (1)
- force unification (1)
- forest plant species (1)
- fully non-linear degenerate parabolic equations (1)
- gene expression (1)
- glucose dehydrogenase (1)
- high pressure (1)
- hydrology (1)
- index (1)
- index formulas (1)
- index theory (1)
- insect (1)
- kombinierte Zeitreihen (1)
- life history (1)
- lifespan (1)
- loop quantum gravity (1)
- manifolds with edges (1)
- metamorphosis (1)
- microarray (1)
- noise (1)
- nondegenerate condition (1)
- novels (1)
- order reduction (1)
- organic crystal (1)
- organische Kristalle (1)
- outliers (1)
- parallelizable spheres (1)
- parameter-dependent cone operators (1)
- parameter-dependent ellipticity (1)
- phenol (1)
- phenology (1)
- physiology-based models (1)
- preadipocyte (1)
- proboscis extension response (1)
- quantum gravity (1)
- rainfall-runoff modelling (1)
- recycling system (1)
- regression analysis (1)
- relative index formulas (1)
- religion (1)
- religiosity (1)
- roe deer (1)
- school commitment (1)
- schools (1)
- semi-arid (1)
- semiclassical states (1)
- semiklassische Zustände (1)
- shock wave (1)
- spectral flow (1)
- stochastic processes (1)
- stochastic resonance (1)
- students (1)
- sucrose responsiveness (1)
- surgery (1)
- symmetry conditions (1)
- systems of partial differential equations (1)
- teachers (1)
- trend turning points (1)
- trends (1)
- tyrosinase (1)
- tyrosinase inhibitors (1)
- uncertainties (1)
- uncertainty (1)
- value education (1)
- value priorities (1)
- values (1)
- variability (1)
- water availability (1)
- wild boar (1)
Institute
- Institut für Mathematik (28)
- Institut für Physik und Astronomie (7)
- Institut für Biochemie und Biologie (4)
- Institut für Chemie (3)
- Department Psychologie (2)
- Extern (2)
- Institut für Informatik und Computational Science (2)
- Institut für Umweltwissenschaften und Geographie (2)
- Institut für Anglistik und Amerikanistik (1)
- Institut für Ernährungswissenschaft (1)
Our every-day experience is connected with different acoustical noise or music. Usually noise plays the role of nuisance in any communication and destroys any order in a system. Similar optical effects are known: strong snowing or raining decreases quality of a vision. In contrast to these situations noisy stimuli can also play a positive constructive role, e.g. a driver can be more concentrated in a presence of quiet music. Transmission processes in neural systems are of especial interest from this point of view: excitation or information will be transmitted only in the case if a signal overcomes a threshold. Dr. Alexei Zaikin from the Potsdam University studies noise-induced phenomena in nonlinear systems from a theoretical point of view. Especially he is interested in the processes, in which noise influences the behaviour of a system twice: if the intensity of noise is over a threshold, it induces some regular structure that will be synchronized with the behaviour of neighbour elements. To obtain such a system with a threshold one needs one more noise source. Dr. Zaikin has analyzed further examples of such doubly stochastic effects and developed a concept of these new phenomena. These theoretical findings are important, because such processes can play a crucial role in neurophysics, technical communication devices and living sciences.
In this paper, the problem on formation and construction of a shock wave for three dimensional compressible Euler equations with the small perturbed spherical initial data is studied. If the given smooth initial data satisfies certain nondegenerate condition, then from the results in [20], we know that there exists a unique blowup point at the blowup time such that the first order derivates of smooth solution blow up meanwhile the solution itself is still continuous at the blowup point. From the blowup point, we construct a weak entropy solution which is not uniformly Lipschitz continuous on two sides of shock curve, moreover the strength of the constructed shock is zero at the blowup point and then gradually increases. Additionally, some detailed and precise estimates on the solution are obtained in the neighbourhood of the blowup point.
This note is devoted to the study on the global existence of a shock wave for the supersonic flow past a curved wedge. When the curved wedge is a small perturbation of a straight wedge and the angle of the wedge is less than some critical value, wwe show that a shock attached at the wedge will exist globally.
Local asymptotic types
(2002)
Significant seasonal variation in size at settlement has been observed in newly settled larvae of Dreissena polymorpha in Lake Constance. Diet quality, which varies temporally and spatially in freshwater habitats, has been suggested as a significant factor influencing life history and development of freshwater invertebrates. Accordingly, experiments were conducted with field-collected larvae to test the hypothesis that diet quality can determine planktonic larval growth rates, size at settlement and subsequent post-metamorphic growth rates. Larvae were fed one of two diets or starved. One diet was composed of cyanobacterial cells which are deficient in polyunsaturated fatty acids (PUFAs), and the other was a mixed diet rich in PUFAs. Freshly metamorphosed animals from the starvation treatment had a carbon content per individual 70% lower than that of larvae fed the mixed diet. This apparent exhaustion of larval internal reserves resulted in a 50% reduction of the postmetamorphic growth rates. Growth was also reduced in animals previously fed the cyanobacterial diet. Hence, low food quantity or low food quality during the larval stage of D. polymorpha lead to irreversible effects for postmetamorphic animals, and is related to inferior competitive abilities.
Anisotropic edge problems
(2002)
We investigate elliptic pseudodifferential operators which degenerate in an anisotropic way on a submanifold of arbitrary codimension. To find Fredholm problems for such operators we adjoint to them boundary and coboundary conditions on the submanifold.The algebra obtained this way is a far reaching generalisation of Boutet de Monvel's algebra of boundary value problems with transmission property. We construct left and right regularisers and prove theorems on hypoellipticity and local solvability.
Today, analytical chemistry does not longer consist of only the big measuring devices and methods which are time consuming and expensive, which can furthermore only be handled by the qualified staff and in addition the results can also only be evaluated by this qualified staff. Usually, this technique, which shall be described in the following as 'classic analytic measuring technique', requires also rooms equipped especially and often a relative big quantity of the test compounds which should be prepared especially. Beside this classic analytic measuring technique, limited on definite substance groups and requests, a new measuring technique has gained acceptance particularly within the last years, which one can often be used by a layman, too. Often the new measuring technique has very little pieces of equipment. The needed sample volumes are also small and a special sample preparation isn't required. In addition, the new measuring instruments are simple to handle. They are cheap both in their production and in the use and they permit even a continuous measurement recording usually. Numerous of this new measuring instruments base on the research in the field of Biosensorik during the last 40 years. Since Clark and Lyon in the year 1962 were able to measure glucose with a simple oxygen electrode, completed by an enzyme the development of the new measuring technique did not have to be held back any longer. Biosensors, special pickups which consists of a combination from a biological component (permits a specific recognition of the analyte also without purification of the sample previously) and a physical pickup (convert the primary physicochemical effect into an electronically measurable signal), conquered the market. In the context of this thesis different tyrosinasesensors were developed which fulfilling the various requests, depending on origin and features of the used tyrosinase. One of the tyrosinasesensors for example was used for quantification of phenolic compounds in river and sea water and the results could correlated very well with the corresponding DIN-test for the determination of phenolic compounds. An other developed tyrosinasesensor showed a very high sensitiveness for catecholamines, substances which are of special importance in the medical diagnostics. In addition, the investigations of two different tyrosinases, which were carried out also in the context of this thesis, have shown, that a special tyrosinase (tyrosinase from Streptomyces antibioticus) will be the better choice as tyrosinase from Agaricus bisporus, which is used in the area of biosensor research till now, if one wants to develop in future even more sensitive tyrosinasesensors. Furthermore, first successes became reached on a molecular biological field, the production of tyrosinasemutants with special, before well-considered features. These successes can be used to develop a new generation of tyrosinasesensors, tyrosinasesensors in which tyrosinase can be bound directionally both to the corresponding physical pickup or also to another enzyme. From this one expects to achieve ways minimized which the substance to be determined (or whose product) otherwise must cover. Finally, this should result in an clearly visible increase of sensitivity of the Biosensor.
Contents: Introduction 1 Operators with the transmission property 1.1 Operators on a manifold with boundary 1.2 Conditions with pseudodifferential projections 1.3 Projections and Fredholm families 2 Boundary value problems not requiring the transmission property 2.1 Interior operators 2.2 Edge amplitude functions 2.3 Boundary value problems 3 Operators with global projection conditions 3.1 Construction for boundary symbols 3.2 Ellipticity of boundary value problems with projection data 3.3 Operators of order zero