Refine
Year of publication
- 1998 (147) (remove)
Document Type
- Preprint (109)
- Article (21)
- Doctoral Thesis (7)
- Lecture (3)
- Report (3)
- Diploma Thesis (1)
- Master's Thesis (1)
- Periodical Part (1)
- Working Paper (1)
Keywords
- AG-RESY (13)
- PARO (12)
- SKALP (9)
- Case Based Reasoning (4)
- industrial robots (4)
- motion planning (3)
- parallel processing (3)
- CIM-OSA (2)
- HANDFLEX (2)
- Kalman filtering (2)
- TOVE (2)
- coset enumeration (2)
- on-line algorithms (2)
- particle methods (2)
- path planning (2)
- search algorithms (2)
- subgroup problem (2)
- Analysis (1)
- Boltzmann Equation (1)
- C5H3(SiMe3)2-Liganden (1)
- CFD (1)
- Chirale Induktion (1)
- Cobalt-Halbsandwichkomplexe (1)
- Complexity (1)
- Correspondence with other notations (1)
- Dependency Factors (1)
- Dirichlet series (1)
- Distributed Software Development (1)
- EXPRESS-G (1)
- Electron states in low-dimensional structures (1)
- Enterprise modeling (1)
- Enterprise modelling (1)
- Funktionalanalysis (1)
- Grid Graphs (1)
- Gröbner base (1)
- Gröbner bases (1)
- Gröbner bases in monoid and group rings (1)
- HOT (1)
- Hilbert transform (1)
- Ill-Posed Problems (1)
- Indexierung (1)
- Inhaltserschließung (1)
- Integral (1)
- Integration (1)
- Internet Based Software Process Management Environment (1)
- Kallianpur-Robbins law (1)
- Koordinationschemie (1)
- Kristallographie (1)
- LCSH (1)
- Learning systems (1)
- Lebesque-Integral (1)
- Linear Integral Equations (1)
- MEGI (1)
- MILOS (1)
- Monoid and group rings (1)
- Monotone dynamical systems (1)
- Navier-Stokes (1)
- Nonlinear dynamics (1)
- Numerical Simulation (1)
- Ontolingua (1)
- Ontology (1)
- PC-based robot control (1)
- PERA (1)
- Phosphor (1)
- Pn (1)
- Quantum mechanics (1)
- RSWK (1)
- Rarefied Gas Flows (1)
- Rayleigh Number (1)
- Recurrent neural networks (1)
- Riemann-Siegel formula (1)
- Riemannsche Summen (1)
- Robust reliability (1)
- SWEEPING (1)
- Simultaneous quantifier elimination (1)
- Singularity theory (1)
- Treppenfunktionen (1)
- Tunneling (1)
- UML (1)
- Vorlesungsskript (1)
- WETICE 98 (1)
- Wannier-Bloch resonance states (1)
- Wannier-Stark systems (1)
- adaptive grid generation (1)
- area loss (1)
- automated proof planner (1)
- bi-directional search (1)
- center and median problems (1)
- chaos (1)
- cholesterische Phasen (1)
- client/server-architecture (1)
- confluence (1)
- convex models (1)
- crack diagnosis (1)
- cusp forms (1)
- da (1)
- damage diagnosis (1)
- discretization (1)
- distributed and parallel processing (1)
- distributed control system (1)
- distributed processing (1)
- domain decomposition (1)
- exact fully discrete vectorial wavelet transform (1)
- fixpoint theorem (1)
- fluid dynamic equations (1)
- graph search (1)
- higher order (1)
- higher order tableau (1)
- initial value representation (1)
- kinetic equations (1)
- kinetic models (1)
- konvexe Analysis (1)
- level set method (1)
- lifetime statistics (1)
- lifetimes (1)
- locational analysis (1)
- log averaging methods (1)
- molekularer Chiralitätswechselwirkungstensor (1)
- monoid- and group-presentations (1)
- moving contact line (1)
- multi-hypothesis diagnosis (1)
- natural language semantics (1)
- non-linear dynamics (1)
- numerics for pdes (1)
- occupation measure (1)
- off-line programming (1)
- planar Brownian motion (1)
- prefix reduction (1)
- prefix string rewriting (1)
- prefix-rewriting (1)
- proof presentation (1)
- pyramid scheme (1)
- quantum chaos (1)
- quantum mechanics (1)
- quasienergy (1)
- rarefied gas flows (1)
- ratio ergodic theorem (1)
- reinitialization (1)
- resonances (1)
- robot calibration (1)
- robot control architectures (1)
- robot motion planning (1)
- rotating machinery (1)
- scale discrete spherical vector wavelets (1)
- search algorithm (1)
- search alogorithms (1)
- semiclassical (1)
- sequent calculus (1)
- skolemization (1)
- stationary solutions (1)
- steady Boltzmann equation (1)
- strong theorems (1)
- subgroup presentation problem (1)
- theorem prover (1)
- trajectory optimization (1)
- variable cardinality case (1)
- vectorial multiresolution analysis (1)
- vehicular traffic (1)
Faculty / Organisational entity
- Kaiserslautern - Fachbereich Informatik (38)
- Kaiserslautern - Fachbereich Mathematik (35)
- Kaiserslautern - Fachbereich Physik (35)
- Fraunhofer (ITWM) (12)
- Kaiserslautern - Fachbereich Wirtschaftswissenschaften (9)
- Kaiserslautern - Fachbereich Elektrotechnik und Informationstechnik (6)
- Kaiserslautern - Fachbereich Maschinenbau und Verfahrenstechnik (6)
- Kaiserslautern - Fachbereich Biologie (3)
- Kaiserslautern - Fachbereich Chemie (2)
- Universitätsbibliothek (1)
Wavelets on closed surfaces in Euclidean space R3 are introduced starting from a scale discrete wavelet transform for potentials harmonic down to a spherical boundary. Essential tools for approximation are integration formulas relating an integral over the sphere to suitable linear combinations of functional values (resp. normal derivatives) on the closed surface under consideration. A scale discrete version of multiresolution is described for potential functions harmonic outside the closed surface and regular at infinity. Furthermore, an exact fully discrete wavelet approximation is developed in case of band-limited wavelets. Finally, the role of wavelets is discussed in three problems, namely (i) the representation of a function on a closed surface from discretely given data, (ii) the (discrete) solution of the exterior Dirichlet problem, and (iii) the (discrete) solution of the exterior Neumann problem.
Verbale Sacherschließung
(1998)
Das Skript gibt eine Einführung in die Geschichte, die Terminologie und die Verfahren der verbalen Sacherschließung. Im deutschsprachigen und englischsprachigen Raum etablierte Verfahren, wie die "Regeln für den Schlagwortkatalog (RSWK)" und die "Library of Congress Subject Headings (LCSH)", werden eingehend beschrieben und Aspekte der Kooperation und Tauglichkeit für Online-Kataloge diskutiert. Charakteristika sowie Vor- und Nachteile der automatischen Indexierung werden anhand des Verfahrens "Maschinelle Indexierung zur verbesserten Literaturerschließung in Online Systemen (MILOS)" dargestellt.
In dieser Arbeit wurden Cophoto- und Cothermolysen einer Serie von alkylierten und silylierten Cyclopentadienylcobaltcarbonylen mit weißem Phosphor untersucht. Dazu wurden einige neue Komplexe des Typus [CpRCo(CO)2] mit CpR= (C5(Me2-1,3)iPr3), (C5H3(Me3Si)2-1,3), (C5H2(Me3Si)3-1,2,4) sowie des Zweikernkomplexes [{CpRCo(micro-CO)}2] mit CpR= (C5(Me2-1,3)iPr3) hergestellt. Neben den vorgenannten Komplexen wurden die bereits literaturbekannten Verbindungen [CpRCo(CO)2] mit CpR= (C5Me5), (C5H4(Me3Si)) als Edukte eingesetzt. Die präparative Zugänglichkeit von drei- bis vierkernigen Cobaltkomplexen mit unsubstituierten P8-, P10- und P12-Liganden konnte beträchtlich erweitert werden. Die thermische Reaktion von Dicarbonyl(trimethylsilylcyclopentadienyl)cobalt mit weißem Phosphor führt in sehr guten Ausbeuten zur Bildung des Clusters [{CpRCo}4P4] (CpR= C5H4(Me3Si)). Die Röntgenstrukturanalyse eines Trillingskristalls läßt lediglich eine ungefähre Bestimmung des Schweratomgerüstes als quadratisches Antiprisma zu. Die Umsetzung von Dicarbonyl(1,3-bis(trimethylsilyl)cyclopentadienyl)cobalt mit weißem Phosphor ergibt unter geeigneten Bedingungen (140°C, 3d) selektiv und in sehr hoher Ausbeute den Vierkernkomplex [{CpRCo}4P10] (I) (CpR= C5H3(Me3Si)2-1,3). Mit I konnte erstmals ein Cobaltkomplex mit einem P10-Liganden röntgenographisch charakterisiert werden. Der Schweratomkäfig in I läßt sich von der Nortricyclanstruktur ableiten. Interessantes Merkmal ist die Koordination eines Cobaltfragmentes an eine P-P-Kante in einer Weise, die einen Zustand zwischen der side-on-Koordination an diese sigma-Bindung und der Insertion in diese Kante darstellt (d(P-P) = 2.47 Å). Die photochemische Reaktion von Dicarbonyl(1,3-bis(trimethylsilyl)cyclopentadienyl)cobalt mit weißem Phosphor ergibt je nach Stöchiometrie die Komplexe [{CpRCo}3P4(CO)] (II) bzw. [{CpRCo}2P4] (III) (CpR= C5H3(Me3Si)2-1,3), die röntgenographisch charakterisiert wurden. Komplex II ist ein arachno-Cluster, der formal von einem zweifach überkappten trigonalen Prisma abgeleitet werden kann. Die längsten P-P-Abstände in II liegen mit d(P-P, Mw.) = 2.51 Å an der Obergrenze bekannter bindender P-P-Wechselwirkungen. Verbindung III ist ein Vertreter einer Serie von [{CpRCo}2(micro,eta2:2-P2)2]-Komplexen, welche ein rechteckig verzerrtes Co2P4-Oktaeder als Schweratomgerüst aufweisen. Es wurden Röntgenstrukturen der Komplexe mit CpR= (C5((CH3)2-1,3)iPr3), (C5H3(Me3Si)2-1,3), (C5H2(Me3Si)3-1,2,4) bestimmt. Diese Verbindungen weisen kurze P-P-Abstände mit d(P-P) = 2.054 bis 2.064 Å sowie P-P-Kontakte von d(P...P) = 2.679 bis 2.713 Å auf.
We have computed ensembles of complete spectra of the staggered Dirac operator using four-dimensional SU(2) gauge fields, both in the quenched approximation and with dynamical fermions. To identify universal features in the Dirac spectrum, we compare the lattice data with predictions from chiral random matrix theory for the distribution of the low-lying eigenvalues. Good agreement is found up to some limiting energy, the so-called Thouless energy, above which random matrix theory no longer applies. We determine the dependence of the Thouless energy on the simulation parameters using the scalar susceptibility and the number variance.
Although several systematic analyses of existing approaches to adaptation have been published recently, a general formal adaptation framework is still missing. This paper presents a step into the direction of developing such a formal model of transformational adaptation. The model is based on the notion of the quality of a solution to a problem, while quality is meant in a more general sense and can also denote some kind of appropriateness, utility, or degree of correctness. Adaptation knowledge is then defined in terms of functions transforming one case into a successor case. The notion of quality provides us with a semantics for adaptation knowledge and allows us to define terms like soundness, correctness and completeness. In this view, adaptation (and even the whole CBR process) appears to be a special instance of an optimization problem.
For the numerical simulation of 3D radiative heat transfer in glasses and glass melts, practically applicable mathematical methods are needed to handle such problems optimal using workstation class computers. Since the exact solution would require super-computer capabilities we concentrate on approximate solutions with a high degree of accuracy. The following approaches are studied: 3D diffusion approximations and 3D ray-tracing methods.
Thermal Properties of Interacting Bose Fields and Imaginary-Time Stochastic Differential Equations
(1998)
Abstract: Matsubara Green's functions for interacting bosons are expressed as classical statistical averages corresponding to a linear imaginary-time stochastic differential equation. This makes direct numerical simulations applicable to the study of equilibrium quantum properties of bosons in the non-perturbative regime. To verify our results we discuss an oscillator with quartic anharmonicity as a prototype model for an interacting Bose gas. An analytic expression for the characteristic function in a thermal state is derived and a Higgs-type phase transition discussed, which occurs when the oscillator frequency becomes negative.
In the present paper we investigate the Rayleigh-Benard convection in rarefied gases and demonstrate by numerical experiments the transition from purely thermal conduction to a natural convective flow for a large range of Knudsen numbers from 0.02 downto 0.001. We address to the problem how the critical value for the Rayleigh number defined for incompressible vsicous flows may be translated to rarefied gas flows. Moreover, the simulations obtained for a Knudsen number Kn=0.001 and Froude number Fr=1 show a further transition from regular Rayleigh-Benard cells to a pure unsteady behavious with moving vortices.
This paper presents a brief overview of the INRECA-II methodology for building and maintaining CBR applications. It is based on the experience factory and the software process modeling approach from software engineering. CBR development and maintenance experience is documented using software process models and stored in a three-layered experience packet.
The critical points of the continuous series are characterized by two complex numbers l_1,l_2 (Re(l_1,l_2)< 0), and a natural number n (n>=3) which enters the string susceptibility constant through gamma = -2/(n-1). The critical potentials are analytic functions with a convergence radius depending on l_1 or l_2. We use the orthogonal polynomial method and solve the Schwinger-Dyson equations with a technique borrowed from conformal field theory.
In system theory, state is a key concept. Here, the word state refers to condition, as in the example Since he went into the hospital, his state of health worsened daily. This colloquial meaning was the starting point for defining the concept of state in system theory. System theory describes the relationship between input X and output Y, that is, between influence and reaction. In system theory, a system is something that shows an observable behavior that may be influenced. Therefore, apart from the system, there must be something else influencing and observing the reaction of the system. This is called the environment of the system.
We consider N coupled linear oscillators with time-dependent coecients. An exact complex amplitude - real phase decomposition of the oscillatory motion is constructed. This decomposition is further used to derive N exact constants of motion which generalise the so-called Ermakov-Lewis invariant of a single oscillator. In the Floquet problem of periodic oscillator coecients we discuss the existence of periodic complex amplitude functions in terms of existing Floquet solutions.
The notion of formal description techniques for timed systems (T-FDTs) has been introduced in [EDK98a] to provide a unifying framework for description techniques that are formal and that allow to describe the ongoing behavior of systems. In this paper we show that three well known temporal logics, MTL, MTL-R , and CTL*, can be embedded in this framework. Moreover, we provide evidence that a large number of dioeerent kinds of temporal logics can be considered as T-FDTs.
Abstract: Random Matrix Theory (RMT) is a powerful statistical tool to model spectral fluctuations. This approach has also found fruitful application in Quantum Chromodynamics (QCD). Importantly, RMT provides very efficient means to separate different scales in the spectral fluctuations. We try to identify the equivalent of a Thouless energy in complete spectra of the QCD Dirac operator for staggered fermions from SU(2) lattice gauge theory for different lattice size and gauge couplings. We focus on the bulk of the spectrum. In disordered systems, the Thouless energy sets the universal scale for which RMT applies. This relates to recent theoretical studies which suggest a strong analogy between QCD and disordered systems. The wealth of data allows us to analyze several statistical measures in the bulk of the spectrum with high quality. We find deviations which allows us to give an estimate for this universal scale. Other deviations than these are seen whose possible origin is discussed. Moreover, we work out higher order correlators as well, in particular three-point correlation functions.
Stand des strategischen Controlling-Berichtwesens und Übertragungsmöglichkeiten auf die Universität
(1998)
The dispersions of dipolar (Damon-Eshbach modes) and exchange dominated spin waves are calculated for in-plane magnetized thin and ultrathin cubic films with (111) crystal orientation and the results are compared with those obtained for the other principal planes. The properties of these magnetic excitations are examined from the point of view of Brillouin light scattering experiments. Attention is paid to study the spin-wave frequency variation as a function of the magnetization direction in the film plane for different film thicknesses. Interface anisotropies and the bulk magnetocrystalline anisotropy are considered in the calculation. A quantitative comparison between an analytical expression obtained in the limit of small film thickness and wave vector and the full numerical calculation is given.