Refine
Has Fulltext
- no (1115) (remove)
Year of publication
- 2002 (1115) (remove)
Document Type
- Article (725)
- Monograph/Edited Volume (211)
- Doctoral Thesis (114)
- Review (62)
- Other (3)
Language
Keywords
- Central Europe (1)
- Democratization (1)
- Demokratisierung (1)
- Eastern Europe (1)
- European Union (1)
- Europäische Union (1)
- Mitteleuropa (1)
- Osteuropa (1)
- Transformation (1)
Institute
- Institut für Physik und Astronomie (130)
- Institut für Biochemie und Biologie (86)
- Historisches Institut (71)
- Wirtschaftswissenschaften (67)
- Department Psychologie (65)
- Institut für Umweltwissenschaften und Geographie (63)
- Institut für Germanistik (51)
- Institut für Mathematik (51)
- Sozialwissenschaften (50)
- Department Sport- und Gesundheitswissenschaften (47)
We study two coupled spatially extended dynamical systems which exhibit space-time chaos. The transition to the synchronized state is treated as a nonequilibrium phase transition, where the average synchronization error is the order parameter. The transition in one-dimensional systems is found to be generically in the universality class of the Kardar- Parisi-Zhang equation with a growth-limiting term ("bounded KPZ"). For systems with very strong nonlinearities in the local dynamics, however, the transition is found to be in the universality class of directed percolation.
We consider a dilute homogeneous mixture of bosons and spin-polarized fermions at zero temperature. We first construct the formal scheme for carrying out systematic perturbation theory in terms of single particle Green's functions. We introduce a new relevant object, the renormalized boson-fermion T-matrix which we determine to second order in the boson-fermion s-wave scattering length. We also discuss how to incorporate the usual boson-boson T-matrix in mean-field approximation to obtain the total ground state properties of the system. The next order term beyond mean- field stems from the boson-fermion interaction and is proportional to $a_{scriptsize BF}k_{scriptsize F}$. The total ground-state energy-density reads $E/V =epsilon_{scriptsize F} + epsilon_{scriptsize B} + (2pihbar^{2}a_{
m BF}n_{scriptsize B}n_{scriptsize F}/m) [1 + a_{scriptsize BF}k_{scriptsize F}f(delta)/pi]$. The first term is the kinetic energy of the free fermions, the second term is the boson-boson mean-field interaction, the pre-factor to the additional term is the usual mean-field contribution to the boson-fermion interaction energy, and the second term in the square brackets is the second-order correction, where $f(delta)$ is a known function of $delta= (m_{scriptsize B} - m_{scriptsize F})/(m_{scriptsize B} + m_{scriptsize F})$. We discuss the relevance of this new term, how it can be incorporated into existing theories of boson-fermion mixtures, and its importance in various parameter regimes, in particular considering mixtures of $^{6}$Li and $^{7}$Li and of $^{3}$He and $^{4}$He.
We calculate the shift in the critical temperature of Bose-Einstein condensation for a dilute Bose-Fermi mixture confined by a harmonic potential, to lowest order in both the Bose-Bose and Bose-Fermi coupling constans. The relativ importance of the effect on the critical temperature of the boson-fermion interactions is investigated as a function of the parameters of mixture. The possible relevance of the shift of the transition temperature in current experiments on trapped Bose-Fermi mixtures is discussed.
We present VR observations of QSO 2237+0305 conducted by the Gravitational Lensing International Time Project collaboration from 1999 October 1 to 2000 February 3. The observations were made with the 2.56 m Nordic Optical Telescope at Roque de los Muchachos Observatory, La Palma (Spain). The point-spread function (PSF) fitting method and an adapted version of the ISIS subtraction method have been used to derive the VR light curves of the four components (A-D) of the quasar. The mean errors range in the intervals 0.01-0.04 mag (PSF fitting) and 0.01-0.02 mag (ISIS subtraction), with the faintest component (D) having the largest uncertainties. We address the relatively good agreement between the A and D light curves derived using different filters, photometric techniques, and telescopes. The new VR light curves of component A extend the time coverage of a high-magnification microlensing peak, which was discovered by the OGLE team.
Methodik der funktionellen Genomanalyse : wie mit Mikroarrays die Aktivität vieler Gene erfasst wird
(2002)
Novel aspects of symbiotic nitrogen fixation uncovered by transcript profiling with cDNA arrays
(2002)
Vortex ripples in sand are studied experimentally in a one-dimensional setup with periodic boundary conditions. The nonlinear evolution, far from the onset of instability, is analyzed in the framework of a simple model developed for homogeneous patterns. The interaction function describing the mass transport between neighboring ripples is extracted from experimental runs using a recently proposed method for data analysis, and the predictions of the model are compared to the experiment. An analytic explanation of the wavelength selection mechanism in the model is provided, and the width of the stable band of ripples is measured.
Der Beitrag beschäftigt sich, mit dem Beschluss des Oberlandesgerichts Naumburg vom 9.10.2000 (NJ 41. 2002). Die Verfasserin wendet sich dagegen, dass das Oberlandesgericht Naumburg in der zu entscheidenden Kindschaftssache analog $ 328 Abs.1 ZPO die Voraussetzungen für eine Anerkennung des in diesem Fall ergangenen Urteils eines DDR-KreisG geprüft hat. Die Autorin erörtert, weshalb es sinnvoller ist, Art. 234 $ 7 Abs.1 EGBGB dahingehend zu interpretieren als dass er dem Bestandsschutz für geklärte Abstammungsverhältnisse dient und daher den gerichtlichen Enscheidungen volle Rechtskraftwirkung nach neuem Recht zuzusprechen.
Die Verfasserinnen besprechen die Entscheidung des OLG Hamburg vom 25.4.2000 zur Scheidung einer Deutschen christlichen Glaubens von einem indischen Schiiten (OLG Hamburg IPRax 2002, 304). Nach einer Darstellung des der Entscheidung zugrunde leigenden Sachverhaltes erörtern sie die wesentlichen Problemstellungen der Entscheidung. Zunächst wenden sie sich ausführlich den Ausführungen des Gerichts zur Wirksamkeit der Ehe selbst zu. Sodann problematisieren die Autorinnen die vom Gericht angenommene versteckte Rückverweisung, auf welche dieses, im Rahmen der Ermittlung des auf die Scheidung anzuwendenden Rechts zurückgegriffen hatte.
Gender-Mainstreaming : Herausforderung für eine eingreifende Genderforschung und Frauenpolitik
(2002)
Water-soluble block copolymers were prepared from the non-ionic monomer N-isopropylacrylamide (NIPA) and the zwitterionic monomer 3-[N-(3-methacrylamidopropyl)-N,N-dimethyl]-ammonio propane sulfonate (SPP) by sequential free radical polymerization via the RAFT process. Such block copolymers with two hydrophilic blocks exhibit double thermo- responsive behavior in water: the poly-NIPA block shows a lower critical solution temperature, whereas the poly-SPP block exhibits an upper critical solution temperature. Appropriate design of the block lengths leads to block copolymers which stay in solution in the full temperature range between 0°C and 100°C. Both blocks of these polymers dissolve in water at intermediate temperatures, whereas at high temperatures, the poly-NIPA block forms colloidal hydrophobic associates that are kept in solution by the poly-SPP block, and at low temperatures, the poly-SPP block forms colloidal polar aggregates that are kept in solution by the poly-NIPA block. In this way, colloidal aggregates can be prepared in water which switch reversibly, and without any additive, their "inside" to the "outside", and vice versa. The aggregates provide microdomains and surfaces of different character, which can be controlled by a simple thermal stimulus.
Vorwort
(2002)
Oligosaccharides composed of 2-acetamido-2-deoxy-D-glucopyranose (GlcNAc) and/or 2-amino-2-deoxy-D- glucopyranose (GlcN) were prepd. by chem. degrdn. of chitin or chitosan and sepd. by gel permeation chromatog. Oligosaccharides obtained after enzymic hydrolysis of chitosan [FA 0.19] with a fungal chitinase were derivatized by reductive amination with 2-aminoacridone and sequenced by matrix-assisted laser desorption ionization time-of-flight postsource decay (PSD) mass spectrometry (MS). The sequence of a trimer, D1A2, was established as D-A-A. The compn. of a hexamer D3A3 was .apprx.65% D-A-D-D-A-A and 35% D-D-A-D-A-A. The PSD MS of a nonamer D5A4-amac revealed four isobaric species D-X-Y-D-X-Y-D-A-A, where A is GlcNAc, D is GlcN, and X and Y (X ¹ Y) are mutually either D or A. This structure motif was also obsd. in a dodecamer D7A5 which was composed of eight isobaric sequences of the general formula (D-X-Y)3- D-A-A.
Marktforschung
(2002)
Schwerpunkte bilden folgende Themen: Warum eine Verwaltungsreform? Wie soll die neue Führungsstruktur aussehen? Ist Dezentralisierung die richtige Lösung? Wie wird die moderne Verwaltung gesteuert? Die Budgetierung als zentrales Steuerungsverfahren Wie werden Gemeinkosten und Vorleistungen gesteuert? Verknüpfung von Ressourcen- und Produktmanagement Warum brauchen wir ein neues Haushalts- und Rechnungskonzept? Wieviel Kostenrechnung braucht die neue Verwaltung?
Kleine Geschichte Spaniens
(2002)
Das antike Erbe
(2002)
Der gerichtliche Vergleich in Wohnungseigentumssachen als Rechtsgeschäft der Wohnungseigentümer
(2002)
Politische Bildung
(2002)
Art.: Gasterosteiform
(2002)