ZIB

1

Online-Ressource

Journal of molecular modeling (1996-2002)

Berlin ; Heidelberg :Springer, ; 1.1995(1996) - 8.2002

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Titel: Journal of molecular modeling

Verlag: Berlin ; Heidelberg :Springer,

Erscheinungsjahr: 1996-2002

Erscheinungsverlauf: 1.1995(1996) - 8.2002

ISSN: 0949-183X

Materialart: Online-Ressource

Sprache: Unbestimmte Sprache

Nachfolgender Titel: Forts. ---〉:Journal of molecular modeling

Anmerkung: Kumuliert jeweils den abgeschlossenen Jg. der Internetausg.

Paralleltitel: Druckausg. ---〉:Molecular modeling annual

URL: http://www.springerlink.com/content/100529

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Zuse-Institut Berlin

2

Zeitschrift/Serie

Intelligence : new visions of AI in practice ; quarterly publication of the ACM, the Association for Computing Machinery (ab 1999-2001)

Association for Computing Machinery

New York, NY :ACM, ; 10.1999 - 12.2001; damit Ersch. eingest.

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Titel: Intelligence : new visions of AI in practice ; quarterly publication of the ACM, the Association for Computing Machinery

Beteiligte Person(en): Association for Computing Machinery

Verlag: New York, NY :ACM,

Erscheinungsjahr: 1999-2001

Erscheinungsverlauf: 10.1999 - 12.2001; damit Ersch. eingest.

ISSN: 1523-8822

Materialart: Zeitschrift/Serie

Sprache: Unbestimmte Sprache

Vorheriger Titel: Vorg. ---〉:Association for Computing Machinery / Special Interest Group on Artificial Intelligence: SIGART bulletin

Paralleltitel: Internetausg. ---〉:Intelligence

URL: Papierausgabe in der Bibliothek vorhanden.

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Zuse-Institut Berlin

3

Zeitschrift/Serie

SIGBIO newsletter / (ab 1969-2001)

Association for Computing Machinery / Special Interest Group on Biomedical Computing

New York, NY :ACM, ; 1.1969 - 7.1975/76; N.S. 1.1976 - 21.2001,1; damit Ersch. eingest.

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Titel: SIGBIO newsletter /

Autor: Association for Computing Machinery / Special Interest Group on Biomedical Computing

Verlag: New York, NY :ACM,

Erscheinungsjahr: 1969-2001

Erscheinungsverlauf: 1.1969 - 7.1975/76; N.S. 1.1976 - 21.2001,1; damit Ersch. eingest.

ISSN: 0163-5697

Materialart: Zeitschrift/Serie

Sprache: Unbestimmte Sprache

Paralleltitel: Internetausg. ---〉:Biomedical computing

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Zuse-Institut Berlin

4

Zeitschrift/Serie

¬The¬ journal of logic programming (ab 1984-2000)

New York, NY :North-Holland, ; 1.1984 - 46.2000

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Titel: ¬The¬ journal of logic programming

Verlag: New York, NY :North-Holland,

Erscheinungsjahr: 1984-2000

Erscheinungsverlauf: 1.1984 - 46.2000

ISSN: 0743-1066

Materialart: Zeitschrift/Serie

Sprache: Unbestimmte Sprache

Nachfolgender Titel: Forts. ---〉:¬The¬ journal of logic and algebraic programming

Paralleltitel: Internetausg. ---〉:¬The¬ journal of logic and algebraic programming

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Zuse-Institut Berlin

5

Zeitschrift/Serie

IEEE concurrency / (ab 1997-2000)

Institute of Electrical and Electronics Engineers / Computer Group

Los Alamitos, Calif. :Soc., ; 5.1997 - 8.2000; damit Ersch. eingest.

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Titel: IEEE concurrency /

Autor: Institute of Electrical and Electronics Engineers / Computer Group

Verlag: Los Alamitos, Calif. :Soc.,

Erscheinungsjahr: 1997-2000

Erscheinungsverlauf: 5.1997 - 8.2000; damit Ersch. eingest.

ISSN: 1092-3063

Materialart: Zeitschrift/Serie

Sprache: Unbestimmte Sprache

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6

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Partial Wigner Transforms and the Quantum--Classical Liouville Equation (1999)

Schütte, Christof

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Publikationsdatum: 2014-02-26

Beschreibung: In molecular dynamics applications there is a growing interest in mixed quantum-classical models. The {\em quantum-classical Liouville equation} (QCL) describes most atoms of the molecular system under consideration by means of classical phase space density but an important, small portion of the system by means of quantum mechanics. The QCL is derived from the full quantum dynamical (QD) description by applying the Wigner transform to the classical part'' of the system only. We discuss the conditions under which the QCL model approximates the full QD evolution of the system. First, analysis of the asymptotic properties of the Wigner transform shows that solving the QCL yields a first order approximation of full quantum dynamics. Second, we discuss the adiabatic limit of the QCL. This discussion shows that the QCL solutions may be interpretated as classical phase space densities, at least near the adiabatic limit. Third, it is demonstrated that the QCL yields good approximations of {\em non-adiabatic quantum effects,} especially near so-called {\em avoided crossings} where most quantum-classical models fail.

Schlagwort(e): ddc:000

Sprache: Englisch

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7

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Markowitz Revisited: Single-Period and Multi-Period Mean-Variance Models (1999)

Steinbach, Marc

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Publikationsdatum: 2021-02-01

Beschreibung: Mean-variance portfolio analysis provided the first quantitative treatment of the tradeoff between profit and risk. We investigate in detail the interplay between objective and constraints in a number of single-period variants, including semi-variance models. Particular emphasis is laid on avoiding the penalization of overperformance. The results are then used as building blocks in the development and theoretical analysis of multi-period models based on scenario trees. A key property is the possibility to remove surplus money in future decisions, yielding approximate downside risk minimization.

Schlagwort(e): ddc:000

Sprache: Englisch

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8

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A comparison of four approaches to the calculation of conservation laws (1999)

Wolf, Thomas

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Publikationsdatum: 2014-02-26

Beschreibung: The paper compares computational aspects of four approaches to compute conservation laws of single differential equations or systems of them, ODEs and PDEs. The only restriction, required by two of the four corresponding computer algebra programs, is that each DE has to be solvable for a leading derivative. Extra constraints may be given. Examples of new conservation laws include non-polynomial expressions, an explicit variable dependence and conservation laws involving arbitrary functions. Examples involve the following equations: Ito, Liouville, Burgers, Kadomtsev-Petviashvili, Karney-Sen-Chu-Verheest, Boussinesq, Tzetzeica, Benney.

Schlagwort(e): ddc:000

Sprache: Englisch

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9

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A Direct Approach to Conformational Dynamics based on Hybrid Monte Carlo (1999)

Schütte, Christof ; Fischer, Alexander ; Huisinga, Wilhelm ; [weitere]

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Publikationsdatum: 2014-02-26

Beschreibung: Recently, a novel concept for the computation of essential features of the dynamics of Hamiltonian systems (such as molecular dynamics) has been proposed. The realization of this concept had been based on subdivision techniques applied to the Frobenius--Perron operator for the dynamical system. The present paper suggests an alternative but related concept that merges the conceptual advantages of the dynamical systems approach with the appropriate statistical physics framework. This approach allows to define the phrase ``conformation'' in terms of the dynamical behavior of the molecular system and to characterize the dynamical stability of conformations. In a first step, the frequency of conformational changes is characterized in statistical terms leading to the definition of some Markov operator $T$ that describes the corresponding transition probabilities within the canonical ensemble. In a second step, a discretization of $T$ via specific hybrid Monte Carlo techniques is shown to lead to a stochastic matrix $P$. With these theoretical preparations, an identification algorithm for conformations is applicable. It is demonstrated that the discretization of $T$ can be restricted to few essential degrees of freedom so that the combinatorial explosion of discretization boxes is prevented and biomolecular systems can be attacked. Numerical results for the n-pentane molecule and the triribonucleotide adenylyl\emph{(3'-5')}cytidylyl\emph{(3'-5')}cytidin are given and interpreted.

Schlagwort(e): ddc:000

Sprache: Englisch

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10

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De-duplication in KOBV (1999)

Lohrum, Stefan ; Schneider, Wolfram ; Willenborg, Josef

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Publikationsdatum: 2021-03-16

Beschreibung: In KOBV we offer the user an efficient tool for searching regional and worldwide accessible library catalogues (KOBV search engine). Search is performed by a distributed Z39.50 retrieval and an index based quicksearch. Due to the number of catalogues, result sets may contain a significant amount of duplicate records. Therefore we integrate a de-duplication procedure into KOBV search engine. It is part of the distributed search and the KOBV quicksearch as well. Main goals are the presentation of uniform retrieval results, the preservation of retrieval quality and cutting off redundant information. At least we keep an eye on efficiency. De-duplication is fully parametrizable, so that settings can be changed easily on line.

Schlagwort(e): ddc:000

Sprache: Englisch

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11

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A Subspace Cascadic Multigrid Method for Mortar Elements (1999)

Braess, Dietrich ; Deuflhard, Peter ; Lipnikov, Konstantin

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Publikationsdatum: 2014-02-26

Beschreibung: A cascadic multigrid (CMG) method for elliptic problems with strong material jumps is proposed and analyzed. Non--matching grids at interfaces between subdomains are allowed and treated by mortar elements. The arising saddle point problems are solved by a subspace confined conjugate gradient method as smoother for the CMG. Details of algorithmic realization including adaptivity are elaborated. Numerical results illustrate the efficiency of this CMG algorithm.

Schlagwort(e): ddc:000

Sprache: Englisch

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12

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Simulation Studies for the Online-Dial-a-Ride Problem (1999)

Grötschel, Martin ; Hauptmeier, Dietrich ; Krumke, Sven ; [weitere]

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Publikationsdatum: 2020-11-13

Beschreibung: In a large distribution center of Herlitz AG, Berlin, we invesigated the elevator subsystem of the fully automated pallet transportation system. Each elevator may carry one pallet and has to serve eight levels. The goal is to minimize the average resp.\ the maximum flow time. The variants of this elevator control problem have been subject of recent theoretical research and are known as online-dial-a-ride problems. In this paper we investigate several online algorithms for several versions of online-dial-a-ride problems by means of a simulation program, developed on the basis of the simulation library AMSEL. We draw statistics from samples of randomly generated data providing for different load situations. Moreover, we provide preliminary studies with real production data for a system of five elevators connected by a conveyor circuit, as can be found at the Herlitz plant. We show which algorithms are best under certain load situations and which lead to break downs under particular circumstances.

Schlagwort(e): ddc:000

Sprache: Englisch

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13

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Graph-Based Algebraic Multigrid for Lagrange-Type Finite Elements on Simplicial Meshes (1999)

Beck, Rudolf

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Publikationsdatum: 2014-02-26

Beschreibung: We present an algebraic multigrid preconditioner which uses only the graphs of system matrices. Some elementary coarsening rules are stated, from which an advancing front algorithm for the selection of coarse grid nodes is derived. This technique can be applied to linear Lagrange-type finite element discretizations; for higher-order elements an extension of the multigrid algorithm is provided. Both two- and three-dimensional second order elliptic problems can be handled. Numerical experiments show that the resulting convergence acceleration is comparable to classical geometric multigrid.

Schlagwort(e): ddc:000

Sprache: Englisch

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14

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Ab Initio Study of Flavonoids (1999)

Meyer, Michael

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Publikationsdatum: 2014-02-26

Beschreibung: Flavone and the flavylium ion have been studied at Hartree-Fock, M{\o}ller-Plesset and B3LYP hybrid density functional level to determine the structures and barriers to internal rotation. Both molecules have a high perpendicular barrier about the single bond connecting the phenyl ring with the benzopyrone and benzopyrylium ring, respectively. In contrast to biphenyl both molecules have low coplanar barriers. B3LYP overestimates the perpendicular barrier heights compared to other methods. The dependence of the population and orbital energies on the torsion has been investigated and the structures of both flavonoids have been estimated by means of a reaction field model.

Schlagwort(e): ddc:000

Sprache: Englisch

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15

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On Conformational Dynamics induced by Langevin Processes (1999)

Schütte, Christof ; Huisinga, Wilhelm

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Publikationsdatum: 2014-02-26

Beschreibung: The function of many important biomolecules is related to their dynamic properties and their ability to switch between different {\em conformations}, which are understood as {\em almost invariant} or {\em metastable} subsets of the positional state space of the system. Recently, the present authors and their coworkers presented a novel algorithmic scheme for the direct numerical determination of such metastable subsets and the transition probability between them. Although being different in most aspects, this method exploits the same basic idea as {\sc Dellnitz} and {\sc Junge} in their approach to almost invariance in discrete dynamical systems: the almost invariant sets are computed via certain eigenvectors of the Markov operators associated with the dynamical behavior. In the present article we analyze the application of this approach to (high--friction) Langevin models describing the dynamical behavior of molecular systems coupled to a heat bath. We will see that this can be related to theoretical results for (symmetric) semigroups of Markov operators going back to {\sc Davies}. We concentrate on a comparison of our approach in respect to random perturbations of dynamical systems.

Schlagwort(e): ddc:000

Sprache: Englisch

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16

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Computer Algebra Methods for Equivariant Dynamical Systems (1999)

Gatermann, Karin

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Publikationsdatum: 2014-02-27

Beschreibung: An introductory chapter on Groebner bases is given which also includes new results on the detection of Groebner bases for sparse polynomial systems. Algorithms for the computation of invariants and equivariants for finite groups, compact Lie groups and algebraic groups are presented and efficient implementation and time comparision are discussed. This chapter also inlcudes improvements of the computation of Noether normalisation and Stanley decomposition. These results are applied in symmetric bifurcation theory and equivariant dynamics. As preparation of the investigation of the orbit space reduction three methods are compared for solving symmetric polynomial systems exactly. The method of orbit space reduction is improved by using the Cohen-Macaulayness of the invariant ring and nested Noether normalization. Finally this is applied for a case of mode interaction in the Taylor-Couette problem.

Schlagwort(e): ddc:000

Sprache: Englisch

Materialart: doctoralthesis , doc-type:doctoralThesis

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17

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A family of sparse polynomial systems arising in chemical reaction systems (1999)

Gatermann, Karin ; Huber, Birkett

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Publikationsdatum: 2014-02-26

Beschreibung: A class of sparse polynomial systems is investigated which is defined by a weighted directed graph and a weighted bipartite graph. They arise in the model of mass action kinetics for chemical reaction systems. In this application the number of real positive solutions within a certain affine subspace is of particular interest. We show that the simplest cases are equivalent to binomial systems while in general the solution structure is highly determined by the properties of the two graphs. First we recall results by Feinberg and give rigorous proofs. Secondly, we explain how the graphs determine the Newton polytopes of the system of sparse polynomials and thus determine the solution structure. The results on positive solutions from real algebraic geometry are applied to this particular situation. Examples illustrate the theoretical results.

Schlagwort(e): ddc:000

Sprache: Englisch

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18

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Decorrelation of the topological charge in tempered Hybrid Monte Carlo simulations of QCD (1999)

Ilgenfritz, Ernst-Michael ; Kerler, Werner ; Stüben, Hinnerk

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Publikationsdatum: 2014-02-26

Beschreibung: We study the improvement of simulations of QCD with dynamical Wilson fermions by combining the Hybrid Monte Carlo algorithm with parallel tempering. As an indicator for decorrelation we use the topological charge.

Schlagwort(e): ddc:000

Sprache: Englisch

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19

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Fast and Intuitive Generation of Geometric Shape Transitions (1999)

Zöckler, Malte ; Stalling, Detlev ; Hege, Hans-Christian

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Publikationsdatum: 2020-03-09

Beschreibung: We describe a novel method for continuously transforming two triangulated models of arbitrary topology into each other. Equal global topology for both objects is assumed, extensions for genus changes during metamorphosis are provided. The proposed method addresses the major challenge in 3D metamorphosis, namely specifying the morphing process intuitively, with minimal user interaction and sufficient detail. Corresponding regions and point features are interactively identified. These regions are parametrized automatically and consistently, providing a basis for smooth interpolation. Utilizing suitable 3D interaction techniques a simple and intuitive control over the whole morphing process is offered.

Schlagwort(e): ddc:000

Sprache: Englisch

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20

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Algebraic Multigrid by Component Splitting for Edge Elements on Simplicial Triangulations (1999)

Beck, Rudolf

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Publikationsdatum: 2014-02-26

Beschreibung: Our focus is on Maxwell's equations in the low frequency range; two specific applications we aim at are time-stepping schemes for eddy current computations and the stationary double-curl equation for time-harmonic fields. We assume that the computational domain is discretized by triangles or tetrahedrons; for the finite element approximation we choose N\'{e}d\'{e}lec's $H(curl)$-conforming edge elements of the lowest order. For the solution of the arising linear equation systems we devise an algebraic multigrid preconditioner based on a spatial component splitting of the field. Mesh coarsening takes place in an auxiliary subspace, which is constructed with the aid of a nodal vector basis. Within this subspace coarse grids are created by exploiting the matrix graphs. Additionally, we have to cope with the kernel of the $curl$-operator, which comprises a considerable part of the spectral modes on the grid. Fortunately, the kernel modes are accessible via a discrete Helmholtz decomposition of the fields; they are smoothed by additional algebraic multigrid cycles. Numerical experiments are included in order to assess the efficacy of the proposed algorithms.

Schlagwort(e): ddc:000

Sprache: Englisch

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21

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Efficient Distributed File I/O for Visualization in Grid Environments (1999)

Benger, Werner ; Hege, Hans-Christian ; Merzky, Andre ; [weitere]

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Publikationsdatum: 2020-03-09

Beschreibung: Large scale simulations running in metacomputing environments face the problem of efficient file I/O. For efficiency it is desirable to write data locally, distributed across the computing environment, and then to minimize data transfer, i.e.\ reduce remote file access. Both aspects require I/O approaches which differ from existing paradigms. For the data output of distributed simulations, one wants to use fast local parallel I/O for all participating nodes, producing a single distributed logical file, while keeping changes to the simulation code as small as possible. For reading the data file as in postprocessing and file based visualization, one wants to have efficient partial access to remote and distributed files, using a global naming scheme and efficient data caching, and again keeping the changes to the postprocessing code small. However, all available software solutions require the entire data to be staged locally (involving possible data recombination and conversion), or suffer from the performance problems of remote or distributed file systems. In this paper we show how to interface the HDF5 I/O library via its flexible Virtual File Driver layer to the Globus Data Grid. We show, that combining these two toolkits in a suitable way provides us with a new I/O framework, which allows efficient, secure, distributed and parallel file I/O in a metacomputing environment.

Schlagwort(e): ddc:000

Sprache: Englisch

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22

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The m-Cost ATSP (1999)

Helmberg, Christoph

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Publikationsdatum: 2014-02-26

Beschreibung: Although the m-ATSP (or multi traveling salesman problem) is well known for its importance in scheduling and vehicle routing, it has, to the best of our knowledge, never been studied polyhedraly, i.e., it has always been transformed to the standard ATSP. This transformation is valid only if the cost of an arc from node $i$ to node $j$ is the same for all machines. In many practical applications this is not the case, machines produce with different speeds and require different (usually sequence dependent) setup times. We present first results of a polyhedral analysis of the m-ATSP in full generality. For this we exploit the tight relation between the subproblem for one machine and the prize collecting traveling salesman problem. We show that, for $m\ge 3$ machines, all facets of the one machine subproblem also define facets of the m-ATSP polytope. In particular the inequalities corresponding to the subtour elimination constraints in the one machine subproblems are facet defining for m-ATSP for $m\ge 2$ and can be separated in polynomial time. Furthermore, they imply the subtour elimination constraints for the ATSP-problem obtained via the standard transformation for identical machines. In addition, we identify a new class of facet defining inequalities of the one machine subproblem, that are also facet defining for m-ATSP for $m\ge 2$. To illustrate the efficacy of the approach we present numerical results for a scheduling problem with non-identical machines, arising in the production of gift wrap at Herlitz PBS AG.

Schlagwort(e): ddc:000

Sprache: Englisch

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23

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Semidefinite Programming (1999)

Helmberg, Christoph

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Publikationsdatum: 2014-02-26

Beschreibung: Due to its many applications in control theory, robust optimization, combinatorial optimization and eigenvalue optimization, semidefinite programming had been in wide spread use even before the development of efficient algorithms brought it into the realm of tractability. Today it is one of the basic modeling and optimization tools along with linear and quadratic programming. Our survey is an introduction to semidefinite programming, its duality and complexity theory, its applications and algorithms.

Schlagwort(e): ddc:000

Sprache: Englisch

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24

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Dark Solitons in Bose-Einstein Condensates (1999)

Burger, Sven ; Bongs, Kai ; Dettmer, Stefanie ; [weitere]

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Publikationsdatum: 2021-02-01

Sprache: Englisch

Materialart: article , doc-type:article

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25

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Wärme für das Leben. Mathematische Hyperthermieplanung am virtuellen Krebspatienten (1999)

Deuflhard, Peter ; Felix, Roland ; Wust, Peter

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Publikationsdatum: 2021-03-16

Sprache: Englisch

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26

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Commentary on Cornelius Lanczos’s Extended Boundary Value Problems (1999)

Deuflhard, Peter

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Publikationsdatum: 2020-03-06

Sprache: Englisch

Materialart: bookpart , doc-type:bookPart

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27

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Commentary on Cornelius Lanczos’s Solution of Ordinary Differential Equations by Trigonometric Interpolation (1999)

Deuflhard, Peter

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Publikationsdatum: 2020-03-06

Sprache: Englisch

Materialart: bookpart , doc-type:bookPart

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28

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Adaptive Multilevel FEM as Decisive Tools in the Clinical Cancer Therapy Hyperthermia (1999)

Deuflhard, Peter ; Seebass, Martin

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Publikationsdatum: 2020-05-06

Sprache: Englisch

Materialart: conferenceobject , doc-type:conferenceObject

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29

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Konformationsdynamik. Mathematischer Entwurf hochspezifischer Biomoleküle (1999)

Deuflhard, Peter ; Schütte, Christof ; Cordes, Frank ; [weitere]

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Publikationsdatum: 2020-08-20

Sprache: Englisch

Materialart: other , doc-type:Other

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30

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Computational Molecular Dynamics: Challenges, Methods, Ideas (1999)

Deuflhard, Peter ; Hermans, J. ; Leimkuhler, Benedict ; [weitere]

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Publikationsdatum: 2021-01-21

Sprache: Englisch

Materialart: proceedings , doc-type:Other

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31

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The Impact of a Nonlinear Heat Transfer Model for Temperature Control in Regional Hyperthermia (1999)

Erdmann, Bodo ; Lang, Jens (Prof. Dr.) ; Seebass, Martin

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Publikationsdatum: 2020-11-16

Sprache: Englisch

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32

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Advanced Extrapolation Methods for Large Scale Differential Algebraic Problems (1999)

Ehrig, Rainald ; Nowak, Ulrich ; Oeverdieck, Lars ; [weitere]

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Publikationsdatum: 2020-12-14

Sprache: Englisch

Materialart: bookpart , doc-type:bookPart

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33

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A Comparsion Between BEM and FEM for Elastic Registration of Medical Images (1999)

Gladilin, Evgeny ; Peckar, W. ; Rohr, K. ; [weitere]

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Publikationsdatum: 2016-06-09

Sprache: Englisch

Materialart: report , doc-type:report

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34

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From Simulation Data to Conformational Ensembles (1999)

Huisinga, Wilhelm (Prof. Dr.) ; Best, Christoph ; Roitzsch, Rainer ; [weitere]

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Publikationsdatum: 2021-01-21

Sprache: Englisch

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35

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A Direct Approach to Conformational Dynamics Based on Hybrid Monte Carlo (1999)

Schütte, Christof ; Fischer, Alexander ; Huisinga, Wilhelm (Prof. Dr.) ; [weitere]

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Publikationsdatum: 2020-10-02

Sprache: Englisch

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36

Unbekannt

Systematic design of antennas for cylindrical 3D phased array hyperthermia applicator (1999)

Wlodarczyk, Waldemar ; Nadobny, Johanna ; Wust, Peter ; [weitere]

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Publikationsdatum: 2021-03-16

Sprache: Englisch

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37

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Künstliches Fieber gegen Krebs (1999)

Wust, Peter ; Felix, Roland ; Deuflhard, Peter

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Publikationsdatum: 2021-03-16

Sprache: Englisch

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38

Unbekannt

Influence of patient models and numerical methods on predicted power deposition patterns (1999)

Wust, Peter ; Nadobny, Johanna ; Seebass, Martin ; [weitere]

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Publikationsdatum: 2021-03-16

Sprache: Englisch

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39

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Computation of Essential Molecular Dynamics by Subdivision Techniques (1999)

Deuflhard, Peter ; Dellnitz, M. ; Junge, Oliver ; [weitere]

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Publikationsdatum: 2021-01-21

Sprache: Englisch

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40

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Numerical Simulation of Soot Particle Size Distributions with a Discrete Galerkin Method (1999)

Appel, Jörg ; Bockhorn, Henning ; Wulkow, Michael

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Publikationsdatum: 2020-04-30

Sprache: Englisch

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41

Unbekannt

Modeling of Thermal Degradation of Polymers (1999)

Bockhorn, Henning ; Hornung, Andreas ; Hornung, Ursel ; [weitere]

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Publikationsdatum: 2020-05-06

Sprache: Englisch

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42

Unbekannt

Zielorientierte Dienstplanoptimierung (1999)

Borndörfer, Ralf ; Löbel, Andreas ; Strubbe, Uwe ; [weitere]

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Publikationsdatum: 2020-08-05

Sprache: Englisch

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43

Unbekannt

Telebus Berlin: Vehicle Scheduling in a Dial-a-Ride System (1999)

Borndörfer, Ralf ; Grötschel, Martin ; Klostermeier, Fridolin ; [weitere]

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Publikationsdatum: 2020-08-05

Sprache: Englisch

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44

Unbekannt

On the computation of the probability of a system failure (1999)

Brandt, Andreas ; Brandt, Manfred

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Publikationsdatum: 2020-08-05

Sprache: Englisch

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45

Unbekannt

A note on the stability of the many-queue head-of-the-line processor-sharing system with permanent customers (1999)

Brandt, Andreas ; Brandt, Manfred

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Publikationsdatum: 2020-08-05

Sprache: Englisch

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46

Unbekannt

On the $M(n)/M(n)/s$ queue with impatient calls (1999)

Brandt, Andreas ; Brandt, Manfred

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Publikationsdatum: 2020-08-05

Sprache: Englisch

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47

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On a two-queue priority system with impatience and its application to a call center (1999)

Brandt, Andreas ; Brandt, Manfred

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Publikationsdatum: 2020-08-05

Sprache: Englisch

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48

Unbekannt

Order picking in an automatic warehouse (1999)

Ascheuer, Norbert ; Grötschel, Martin ; Abdel-Hamid, Atef Abdel-Aziz

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Publikationsdatum: 2021-03-19

Sprache: Englisch

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49

Unbekannt

Combinatorial Online Optimization (1999)

Ascheuer, Norbert ; Grötschel, Martin ; Krumke, Sven ; [weitere]

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Publikationsdatum: 2020-08-05

Sprache: Englisch

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50

Unbekannt

My Favorite Theorem (1999)

Grötschel, Martin

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Publikationsdatum: 2020-08-05

Sprache: Englisch

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51

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Verkehrsplanung (1999)

Grötschel, Martin

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Publikationsdatum: 2020-10-02

Sprache: Englisch

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52

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Wo bleibt der Aufzug? (1999)

Grötschel, Martin ; Krumke, Sven ; Rambau, Jörg

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Publikationsdatum: 2020-08-05

Sprache: Englisch

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53

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Scientific Information Systems and Metadata (1999)

Grötschel, Martin ; Lügger, Joachim

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Publikationsdatum: 2020-09-24

Sprache: Englisch

Materialart: bookpart , doc-type:bookPart

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54

Unbekannt

Der Kooperative Bibliotheksverbund Berlin-Brandenburg (1999)

Grötschel, Martin ; Kuberek, Monika ; Lohrum, Stefan ; [weitere]

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Publikationsdatum: 2020-11-13

Sprache: Englisch

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55

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Die optimierte Odyssee (1999)

Grötschel, Martin ; Padberg, Manfred

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Publikationsdatum: 2020-08-05

Sprache: Englisch

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56

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Die optimierte Odyssee (1999)

Grötschel, Martin ; Padberg, Manfred

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Publikationsdatum: 2020-08-05

Sprache: Englisch

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57

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Adaptive multilevel methods for edge element discretizations of Maxwell’s equations (1999)

Beck, Rudolf ; Deuflhard, Peter ; Hiptmair, Ralf ; [weitere]

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Publikationsdatum: 2021-03-16

Sprache: Englisch

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58

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Coherent Evolution of Bouncing Bose-Einstein Condensates (1999)

Bongs, Kai ; Burger, Sven ; Birkl, G. ; [weitere]

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Publikationsdatum: 2021-02-01

Sprache: Englisch

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59

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The Generalized Baues Problem for Cyclic Polytopes II (1999)

Athanasiadis, Christos A. ; Rambau, Jörg ; Santos, Francisco

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Publikationsdatum: 2014-11-10

Beschreibung: Given an affine surjection of polytopes $\pi: P \to Q$, the Generalized Baues Problem asks whether the poset of all proper polyhedral subdivisions of $Q$ which are induced by the map $\pi$ has the homotopy type of a sphere. We extend earlier work of the last two authors on subdivisions of cyclic polytopes to give an affirmative answer to the problem for the natural surjections between cyclic polytopes $\pi: C(n,d') \to C(n,d)$ for all $1 \leq d 〈 d' 〈 n$.

Schlagwort(e): ddc:000

Sprache: Englisch

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60

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The Cayley Trick, lifting subdivisions and the Bohne-Dress theorem on zonotopal tilings (1999)

Huber, Birkett ; Rambau, Jörg ; Santos, Francisco

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Publikationsdatum: 2014-11-10

Beschreibung: In 1994, Sturmfels gave a polyhedral version of the Cayley Trick of elimination theory: he established an order-preserving bijection between the posets of \emph{coherent} mixed subdivisions of a Minkowski sum $\mathcal{A}_1+\cdots+\mathcal{A}_r$ of point configurations and of \emph{coherent} polyhedral subdivisions of the associated Cayley embedding $\mathcal{C}(\mathcal{A}_1,\dots,\mathcal{A}_r)$. In this paper we extend this correspondence in a natural way to cover also \emph{non-coherent} subdivisions. As an application, we show that the Cayley Trick combined with results of Santos on subdivisions of Lawrence polytopes provides a new independent proof of the Bohne-Dress Theorem on zonotopal tilings. This application uses a combinatorial characterization of lifting subdivisions, also originally proved by Santos.

Schlagwort(e): ddc:000

Sprache: Englisch

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61

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A symmetry test for quasilinear coupled systems (1999)

Sokolov, Vladimir V. ; Wolf, Thomas

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Publikationsdatum: 2014-02-26

Beschreibung: It is well known that the following class of systems of evolution equations \begin{eqnarray} \label{nsgen} \cases{ u_{t}=u_{xx}+F(u,v,u_x,v_x),\cr v_{t}=-v_{xx}+G(u,v,u_x,v_x),\cr} \end{eqnarray} is very rich in integrable cases. The complete classification problem is very difficult. Here we consider only the most interesting (from our opinion) subclass of systems (1). Namely, we consider equations linear in all derivatives of the form \begin{eqnarray} \label{kvazgen} \cases{ u_t = u_{xx} + A_{1}(u,v) u_x + A_{2}(u,v) v_x + A_{0}(u,v)\cr v_t = - v_{xx} + B_{1}(u,v) v_x + B_{2}(u,v) u_x + B_{0}(u,v). \cr} \end{eqnarray} without any restrictions on the functions $A_{i}(u,v), B_{i}(u,v)$.

Schlagwort(e): ddc:000

Sprache: Englisch

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62

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Euler is Standing in Line (1999)

Hauptmeier, Dietrich ; Krumke, Sven ; Rambau, Jörg ; [weitere]

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Publikationsdatum: 2020-11-13

Beschreibung: In this paper we study algorithms for ``Dial-a-Ride'' transportation problems. In the basic version of the problem we are given transportation jobs between the vertices of a graph and the goal is to find a shortest transportation that serves all the jobs. This problem is known to be NP-hard even on trees. We consider the extension when precedence relations between the jobs with the same source are given. Our results include a polynomial time algorithm on paths and an approximation algorithm on general graphs with a performance of~$9/4$. For trees we improve the performance to~$5/3$.

Schlagwort(e): ddc:000

Sprache: Englisch

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63

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Integer Programs with Block Structure (1999)

Martin, Alexander

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Publikationsdatum: 2020-08-05

Beschreibung: In this thesis we study and solve integer programs with block structure, i.\,e., problems that after the removal of certain rows (or columns) of the constraint matrix decompose into independent subproblems. The matrices associated with each subproblem are called blocks and the rows (columns) to be removed linking constraints (columns). Integer programs with block structure come up in a natural way in many real-world applications. The methods that are widely used to tackle integer programs with block structure are decomposition methods. The idea is to decouple the linking constraints (variables) from the problem and treat them at a superordinate level, often called master problem. The resulting residual subordinate problem then decomposes into independent subproblems that often can be solved more efficiently. Decomposition methods now work alternately on the master and subordinate problem and iteratively exchange information to solve the original problem to optimality. In Part I we follow a different approach. We treat the integer programming problem as a whole and keep the linking constraints in the formulation. We consider the associated polyhedra and investigate the polyhedral consequences of the involved linking constraints. The variety and complexity of the new inequalities that come into play is illustrated on three different types of real-world problems. The applications arise in the design of electronic circuits, in telecommunication and production planning. We develop a branch-and-cut algorithm for each of these problems, and our computational results show the benefits and limits of the polyhedral approach to solve these real-world models with block structure. Part II of the thesis deals with general mixed integer programming problems, that is integer programs with no apparent structure in the constraint matrix. We will discuss in Chapter 5 the main ingredients of an LP based branch-and-bound algorithm for the solution of general integer programs. Chapter 6 then asks the question whether general integer programs decompose into certain block structures and investigate whether it is possible to recognize such a structure. The remaining two chapters exploit information about the block structure of an integer program. In Chapter 7 we parallelize parts of the dual simplex algorithm, the method that is commonly used for the solution of the underlying linear programs within a branch-and-cut algorithm. In Chapter 8 we try to detect small blocks in the constraint matrix and to derive new cutting planes that strengthen the integer programming formulation. These inequalities may be associated with the intersection of several knapsack problems. We will see that they significantly improve the quality of the general integer programming solver introduced in Chapter 5.

Schlagwort(e): ddc:000

Sprache: Englisch

Materialart: doctoralthesis , doc-type:doctoralThesis

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64

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Numerical Calculation of the Heat Transfer in an Adsorption Energy Storage with KARDOS (1999)

Seewald, Frank ; Pollei, Anja ; Kraume, Matthias ; [weitere]

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Publikationsdatum: 2014-02-26

Beschreibung: A new seasonal energy storage for thermal solar systems has been developed on the basis of an adsorption-desorption process. Design and optimization of this storage will be supported by numerical simulations of heat and mass transfer with KARDOS. This paper focuses on the unsteady heat transfer during the major operating step of energetic discharge of the storage, which is characterized by conductive heat transfer in the fixed bed and a strong heat source caused by the adsorption enthalpy. Results are interpreted concerning the influence of variations in the parameter set. The method of implementation of the differential equation will be shown as well as the post-processing and gridwriting programs.

Schlagwort(e): ddc:000

Sprache: Englisch

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65

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The Online Dial-a-Ride Problem under Reasonable Load (1999)

Hauptmeier, Dietrich ; Krumke, Sven ; Rambau, Jörg

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Publikationsdatum: 2020-11-13

Beschreibung: In this paper, we analyze algorithms for the online dial-a-ride problem with request sets that fulfill a certain worst-case restriction: roughly speaking, a set of requests for the online dial-a-ride problem is reasonable if the requests that come up in a sufficiently large time period can be served in a time period of at most the same length. This new notion is a stability criterion implying that the system is not overloaded. The new concept is used to analyze the online dial-a-ride problem for the minimization of the maximal resp.\ average flow time. Under reasonable load it is possible to distinguish the performance of two particular algorithms for this problem, which seems to be impossible by means of classical competitive analysis.

Schlagwort(e): ddc:000

Sprache: Englisch

Materialart: reportzib , doc-type:preprint

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66

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Conformational Dynamics: Modelling, Theory, Algorithm, and Application to Biomolecules (1999)

Schütte, Christof

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Publikationsdatum: 2014-02-27

Beschreibung: The function of many important biomolecules comes from their dynamic properties and their ability to switch between different {\em conformations}. In a conformation, the large scale geometric structure of the molecule is understood to be conserved, whereas on smaller scales the system may well rotate, oscillate or fluctuate. In a recent article [J. Comp. Phys., 151,1 (1999)], the present author and coworkers demonstrated that (a) conformations can be understood as almost invariant sets of some Markov chain being defined via the Hamiltonian system governing the molecular dynamics and that (b) these sets can efficiently be computed via eigenvectors of the corresponding Markov operator. The persent manuscript reviews the mathematical modelling steps behind the novel concept, includes a rigorous analytical justification of this approach and especially of the numerical details of the algorithm, and illustrates its performance when applied to realistic molecular systems.

Schlagwort(e): ddc:000

Sprache: Englisch

Materialart: doctoralthesis , doc-type:doctoralThesis

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My Favorite Theorem: Characterizations of Perfect Graphs (1999)

Grötschel, Martin

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Publikationsdatum: 2014-02-26

Beschreibung: This paper summarizes and discusses various characterizations of perfect graphs and mentions some open problems in this area.

Schlagwort(e): ddc:000

Sprache: Englisch

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68

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Adaptive Multilevel Solution of Nonlinear Parabolic PDE Systems. Theory, Algorithm, and Applications (1999)

Lang, Jens

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Publikationsdatum: 2014-02-27

Beschreibung: This monograph has been written to illustrate the interlocking of theory, algorithm, and application in developing solution techniques for complex PDE systems. A deep theoretical understanding is necessary to produce a powerful idea leading to a successful algorithm. Efficient and robust implementation is the key to make the algorithm perform satisfactorily. The extra insight obtained by solving real--life problems brings out the structure of the method more clearly and suggests often ways to improve the numerical algorithm. It is my intention to impart the beauty and complexity found in both the theoretical investigation of the adaptive algorithm proposed here, i.e., the coupling of Rosenbrock methods in time and multilevel finite elements in space, and its realization. I hope that this method will find many more interesting applications.

Schlagwort(e): ddc:000

Sprache: Englisch

Materialart: doctoralthesis , doc-type:doctoralThesis

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69

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Solving the Asymmetric Travelling Salesman Problem with Time Windows by Branch-and-Cut (1999)

Ascheuer, Norbert ; Fischetti, Matteo ; Grötschel, Martin

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Publikationsdatum: 2014-02-26

Beschreibung: Many optimization problems have several equivalent mathematical models. It is often not apparent which of these models is most suitable for practical computation, in particular, when a certain application with a specific range of instance sizes is in focus. Our paper addresses the Asymmetric Travelling Salesman Problem with time windows (ATSP-TW) from such a point of view. The real--world application we aim at is the control of a stacker crane in a warehouse. We have implemented codes based on three alternative integer programming formulations of the ATSP-TW and more than ten heuristics. Computational results for real-world instances with up to 233 nodes are reported, showing that a new model presented in a companion paper outperforms the other two models we considered --- at least for our special application --- and that the heuristics provide acceptable solutions.

Schlagwort(e): ddc:000

Sprache: Englisch

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70

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Solution of the Time-Dependent Schroedinger Equation for Highly Symmetric Potentials (1999)

Schmidt, Burkhard ; Zdanska, Petra

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Publikationsdatum: 2014-02-26

Beschreibung: The method of symmetry adapted wavepackets (SAWP) to solve the time-dependent Schrödinger equation for a highly symmetric potential energy surface is introduced. The angular dependence of a quantum-mechanical wavepackets is expanded in spherical harmonics where the number of close-coupled equations for the corresponding radial functions can be efficiently reduced by symmetry adaption of the rotational basis using the SWAP approach. Various techniques to generate symmetry adapted spherical harmonics (SASHs) for the point groups of highest symmetry (octahedral, icosahedral) are discussed. The standard projection operator technique involves the use of Wigner rotation matrices. Two methods to circumvent numerical instabilities occuring for large azimuthal quantum numbers are suggested. The first is based on a numerical scheme which employs Gaussian integrations yielding exact and stable results. The second is a recursive algorithm to generate higher order SASHs accurately and efficiently from lower order ones. The paper gives a complete set of ``seed functions'' generated by projection techniques which can be used obtain SASHs for all irreducible representations of the octahedral and icosahedral point groups recursively.

Schlagwort(e): ddc:000

Sprache: Englisch

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Transfer Operator Approach to Conformational Dynamics in Biomolecular Systems (1999)

Schütte, Christof ; Huisinga, Wilhelm ; Deuflhard, Peter

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Publikationsdatum: 2014-02-26

Beschreibung: The article surveys the development of novel mathematical concepts and algorithmic approaches based thereon in view of their possible applicability to biomolecular design. Both a first deterministic approach, based on the Frobenius-Perron operator corresponding to the flow of the Hamiltonian dynamics, and later stochastic approaches, based on a spatial Markov operator or on Langevin dynamics, can be subsumed under the unified mathematical roof of the transfer operator approach to effective dynamics of molecular systems. The key idea of constructing specific transfer operators especially taylored for the purpose of conformational dynamics appears as the red line throughout the paper. Different steps of the algorithm are exemplified by a trinucleotide molecular system as a small representative of possible RNA drug molecules.

Schlagwort(e): ddc:000

Sprache: Englisch

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72

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Visualizing Quantum Mechanical Phenomena (1999)

Schmidt-Ehrenberg, Johannes ; Hege, Hans-Christian

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Publikationsdatum: 2020-03-09

Beschreibung: In this paper we discuss several ways to visualize stationary and non-stationary quantum mechanical systems. We demonstrate an approach for the quantitative interpretation of probability density isovalues which yields a reasonable correlation between isosurfaces for different timesteps. As an intuitive quantity for visualizing the momentum of a quantum system we propose the probability flow density which can be treated by vector field visualization techniques. Finally, we discuss the visualization of non-stationary systems by a sequence of single timestep images.

Schlagwort(e): ddc:000

Sprache: Englisch

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73

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Self-Organizing Maps Combined with Eigenmode Analysis for Automated Cluster Identification (1999)

Galliat, Tobias ; Huisinga, Wilhelm ; Deuflhard, Peter

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Publikationsdatum: 2014-02-26

Beschreibung: One of the important tasks in Data Mining is automated cluster analysis. Self-Organizing Maps (SOMs) introduced by {\sc Kohonen} are, in principle, a powerful tool for this task. Up to now, however, its cluster identification part is still open to personal bias. The present paper suggests a new approach towards automated cluster identification based on a combination of SOMs with an eigenmode analysis that has recently been developed by {\sc Deuflhard et al.} in the context of molecular conformational dynamics. Details of the algorithm are worked out. Numerical examples from Data Mining and Molecular Dynamics are included.

Schlagwort(e): ddc:000

Sprache: Englisch

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74

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Control of photoassociation yield: A quantum-dynamical study of the mercury system to explore the role of pulse duration from nanoseconds to femtoseconds (1999)

Backhaus, Peter ; Schmidt, Burkhard ; Dantus, Marcos

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Publikationsdatum: 2014-02-26

Beschreibung: The photoassociation process shows strong dependence on the temporal duration of the electromagnetic field pulses and their frequencies. This dependence is investigated using quantum mechanical simulations that include all ranges of impact parameters and contributions from bound-to-bound transitions. The photoassociation yield of mercury atoms to produce excimer dimers is enhanced for short (ps) and for ultrashort (fs) pulse durations. Ultrashort laser pulses effectively overlap the entire range of free-to-bound transition, therefore achieving a maximum probability. Short pulses show a maximum in the photoassociation yield when their carrier frequency overlaps a particular free-to-bound spectroscopic resonance. Implications of these calculations on efforts to control bimolecular reactions are discussed.

Schlagwort(e): ddc:000

Sprache: Englisch

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75

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Clustering Data of Different Information Levels (1999)

Galliat, Tobias

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Publikationsdatum: 2014-02-26

Beschreibung: For using Data Mining, especially cluster analysis, one needs measures to determine the similarity or distance between data objects. In many application fields the data objects can have different information levels. In this case the widely used euclidean distance is an inappropriate measure. The present paper describes a concept how to use data of different information levels in cluster analysis and suggests an appropriate similarity measure. An example from practice is included, that shows the usefulness of the concept and the measure in combination with {\sc Kohonens} Self-Organizing Map algorithm, a well-known and powerful tool for cluster analysis.

Schlagwort(e): ddc:000

Sprache: Englisch

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76

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Cutting Planes in Integer and Mixed Integer Programming (1999)

Marchand, Hugues ; Martin, Alexander ; Weismantel, Robert ; [weitere]

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Publikationsdatum: 2021-03-16

Beschreibung: This survey presents cutting planes that are useful or potentially useful in solving mixed integer programs. Valid inequalities for i) general integer programs, ii) problems with local structure such as knapsack constraints, and iii) problems with 0-1 coefficient matrices, such as set packing, are examined in turn. Finally the use of valid inequalities for classes of problems with structure, such as network design, is explored.

Schlagwort(e): ddc:000

Sprache: Englisch

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77

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Decorrelation of the Topological Charge in Tempered Simulations of Full QCD (1999)

Stüben, Hinnerk

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Publikationsdatum: 2014-02-26

Beschreibung: The improvement of simulations of QCD with dynamical Wilson fermions by combining the Hybrid Monte Carlo algorithm with parallel tempering is studied. As an indicator for decorrelation the topological charge is used.

Schlagwort(e): ddc:000

Sprache: Englisch

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78

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Differential Equations in Technology and Medicine. Computational Concepts, Adaptive Algorithms, and Virtual Labs (1999)

Deuflhard, Peter

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Publikationsdatum: 2014-02-26

Beschreibung: This series of lectures has been given to a class of mathematics postdocs at a European summer school on Computational Mathematics Driven by Industrial Applications in Martina Franca, Italy (organized by CIME). It deals with a variety of challenging real life problems selected from clinical cancer therapy, communication technology, polymer production, and pharmaceutical drug design. All of these problems from rather diverse application areas share two common features: (a) they have been modelled by various differential equations -- elliptic, parabolic, or Schrödinger--type partial differential equations, countable ordinary diffential equations, or Hamiltonian systems, (b) their numerical solution has turned out to be real challenge to computational mathematics.

Schlagwort(e): ddc:000

Sprache: Englisch

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79

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A Spectral Bundle Method with Bounds (1999)

Helmberg, Christoph ; Kiwiel, K.C.

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Publikationsdatum: 2014-02-26

Beschreibung: Semidefinite relaxations of quadratic 0-1 programming or graph partitioning problems are well known to be of high quality. However, solving them by primal-dual interior point methods can take much time even for problems of moderate size. The recent spectral bundle method of Helmberg and Rendl can solve quite efficiently large structured equality-constrained semidefinite programs if the trace of the primal matrix variable is fixed, as happens in many applications. We extend the method so that it can handle inequality constraints without seriously increasing computation time. Encouraging preliminary computational results are reported.

Schlagwort(e): ddc:000

Sprache: Englisch

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80

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Container Adaptors (1999)

Powell, Gary ; Weiser, Martin

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Publikationsdatum: 2019-01-29

Beschreibung: The C++ standard template library has many useful containers for data. The standard library includes two adpators, queue, and stack. The authors have extended this model along the lines of relational database semantics. Sometimes the analogy is striking, and we will point it out occasionally. An adaptor allows the standard algorithms to be used on a subset or modification of the data without having to copy the data elements into a new container. The authors provide many useful adaptors which can be used together to produce interesting views of data in a container.

Schlagwort(e): ddc:000

Sprache: Englisch

Materialart: reportzib , doc-type:preprint

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81

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A Picture-based Document Retrieval Service for the Electronic Visualization Library (1999)

Decker, Ingmar

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Publikationsdatum: 2014-02-26

Beschreibung: This report describes the development of an experimental service for picture-based document retrieval for the Electronic Visualization Library (EVlib). The EVlib is a digital library for scientific visualization, established at the Konrad-Zuse-Zentrum für Informationstechnik Berlin (ZIB). The picture-based retrieval service allows users to look for documents by describing the pictures they contain. This query method was developed based on the assumption that (1) pictures often represent relevant parts of the contents of a document, and (2) pictures are often remembered well. A picture-based approach provides a new quality of accessing and exploring scientific literature. Motivation, concepts and realization of our service are outlined. Results of a user test are presented, too. The results indicate that this service can be used for searching and browsing the document collection in principle. On the other hand, problems were detected which can give fruitful hints for future work concerning document and image retrieval.

Schlagwort(e): ddc:000

Sprache: Englisch

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82

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Transparent Boundary Conditions for Split-Step Pade Approximations of the One-Way Helmholtz Equation (1999)

Schmidt, Frank ; Friese, Tilmann ; Yevick, David

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Publikationsdatum: 2022-07-07

Beschreibung: In this paper, we generalize the nonlocal discrete transparent boundary condition introduced by Schmidt and Deuflhard {[}Comp. Math. Appl. 29 (1995) 53-76{]} and Schmidt and Yevick {[}J. Comput. Phys. 134 (1997) 96-107{]} to propagation methods based on arbitrary Pad\'e approximations to the two-dimensional one-way Helmholtz equation. Our approach leads to a recursive formula for the coefficients appearing in the nonlocal condition which then yields an unconditionally stable propagation method.

Schlagwort(e): ddc:000

Sprache: Englisch

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83

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Construction of Discrete Transparent Boundary Conditions for Schrödinger-Type equations (1999)

Schmidt, Frank

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Publikationsdatum: 2022-07-07

Sprache: Englisch

Materialart: article , doc-type:article

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84

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Transparent Boundary Conditions for a Wide-Angle Approximation of the One-Way Helmholtz Equation (1999)

Friese, Tilman ; Schmidt, Frank ; Yevick, David

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Publikationsdatum: 2022-07-07

Beschreibung: We present nonlocal discrete transparent boundary conditions for a fourth-order wide-angle approximation of the two-dimensional Helmholtz equation. The boundary conditions are exact in the sense that they supply the same discrete solution on a bounded interior domain as would be obtained by considering the problem on the entire unbounded domain with zero boundary conditions at infinity. The proposed algorithm results in an unconditionally stable propagation method. Numerical examples from optics illustrate the efficiency of our approach.

Schlagwort(e): ddc:000

Sprache: Englisch

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85

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A Multigrid Method for the Complex Helmholtz Eigenvalue Problem (1999)

Friese, T. ; Deuflhard, Peter ; Schmidt, Frank

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Publikationsdatum: 2022-07-07

Sprache: Englisch

Materialart: conferenceobject , doc-type:conferenceObject

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86

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Fernsteuerung und Fernüberwachung von verteilten Anwendungen (1999)

Merzky, André

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Publikationsdatum: 2022-07-19

Sprache: Englisch

Materialart: book , doc-type:book

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87

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A Quantitative Three-Dimensional Model of the Drosophila Optic Lobes (1999)

Rein, Karlheinz ; Zöckler, Malte ; Heisenberg, Martin

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Publikationsdatum: 2022-07-19

Sprache: Englisch

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88

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Fast Texture-Based Algorithms for Vector Field Visualization (1999)

Stalling, Detlev

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Publikationsdatum: 2022-07-19

Sprache: Englisch

Materialart: book , doc-type:book

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89

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Visualization of Groundwater Flow Using Line Integral Convolution (1999)

Gotthardt, Jörg ; Blömer, Carola ; Stalling, Detlev

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Publikationsdatum: 2022-07-19

Sprache: Englisch

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90

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3D Phased Array Applicator for Hyperthermia Treatment in Pelvis (1999)

Nadobny, Jacek ; Wlodarczyk, Waldemar ; Wust, Peter ; [weitere]

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Publikationsdatum: 2022-07-19

Sprache: Englisch

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91

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Three Dimensional Reconstruction of Honey Bee Mushroom Bodies (1999)

Brandt, Robert ; Malun, Dagmar ; Steege, A. ; [weitere]

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Publikationsdatum: 2022-07-19

Sprache: Englisch

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92

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A Quantitative 3D Model of the Flybrain: Shape and Arrangement of Neuropils (1999)

Rein, Karlheinz ; Zöckler, Malte ; Heisenberg, Martin

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Publikationsdatum: 2022-07-19

Sprache: Englisch

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93

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A 2D Planning Sytem for Robot-Assisted Interventions (1999)

Hein, Andreas ; Lueth, Tim ; Zachow, Stefan ; [weitere]

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Publikationsdatum: 2022-07-19

Sprache: Englisch

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94

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Numerical Relativity in a Distributed Environment (1999)

Benger, Werner ; Foster, Ian ; Novotny, Jason ; [weitere]

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Publikationsdatum: 2022-07-19

Sprache: Englisch

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95

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Systematic Design of Antennas for a Cylindrical 3D Phased Array Hyperthermia Applicator (1999)

Wlodarczyk, Waldemar ; Nadobny, Jacek ; Wust, Peter ; [weitere]

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Publikationsdatum: 2022-07-19

Sprache: Englisch

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96

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Geometrische Methoden zur 3D-Segmentierung (1999)

Westerhoff, Natascha

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Publikationsdatum: 2022-07-19

Sprache: Englisch

Materialart: masterthesis , doc-type:masterThesis

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97

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Design and Implementation of a planning system for episthetic surgery (1999)

Zachow, Stefan

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Publikationsdatum: 2022-07-19

Sprache: Englisch

Materialart: masterthesis , doc-type:masterThesis

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98

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Algorithms and Methods for the Visualization of Molecular Surfaces and Interfaces (1999)

Runge, Daniel

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Publikationsdatum: 2022-07-19

Sprache: Englisch

Materialart: masterthesis , doc-type:masterThesis

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99

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Regionenbasierte Segmentierungsverfahren für dreidimensionale biomedizinische Bilddaten (1999)

Lange, Thomas

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Publikationsdatum: 2022-07-19

Sprache: Englisch

Materialart: masterthesis , doc-type:masterThesis

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Solving Einstein’s Equations on Supercomputers (1999)

Allen, Gabrielle ; Goodale, Tom ; Lanfermann, Gerd ; [weitere]

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Publikationsdatum: 2022-07-19

Sprache: Englisch

Materialart: article , doc-type:article

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