A semi-Lagrangian method for a Fokker-Planck equation describing fiber dynamics. (2009)
Klar, A., Reuterswärd, P., Seaïd, M.
A simplified Fokker-Planck model for the lay-down of fibers on a conveyor belt in the production process of nonwovens is investigated. It takes into account the motion of the fiber under the...
Internet: www.itwm.fraunhofer.de (2009)
L. Bonilla, T. Götz, A. Klar, N. Marheineke, R. Wegener
Planck-equation describing fiber
Thömmes, G., Becker, J., Junk, M., Vaikuntam, A.K., Kehrwald, D., Klar, A., ...
We consider the lattice Boltzmann method for immiscible multiphase flow simulations. Classical lattice Boltzmann methods for this problem, e.g. the colour gradient method or the free energy approach,...
A semi-lagrangian method for a Fokker-Planck equation describing fiber dynamics (2009)
Klar, A., Reuterswärd, P., Seaid, M.
A simplified Fokker-Planck model for the lay-down of fibers on a conveyor belt in the production process of nonwovens is investigated. It takes into account the motion of the fiber under the...
Atrial Natriuretic Peptide in Young and Elderly Children with Mild Gastroenteritis (2009)
A. Klar, E. Haver, D. Lichtstein, H. Hurvitz, T. Foah-Shauli
Objective. Atrial Natriuretic Peptide (ANP) has natriuretic and diuretic effects, synthesized and stored in the atrial cells, released in response to stretch of the atrial muscle during increase...
Atrial Natriuretic Peptide in Young and Elderly Children with Mild Gastroenteritis (2009)
A. Klar, E. Haver, D. Lichtstein, H. Hurvitz, T. Foah-Shauli
Objective. Atrial Natriuretic Peptide (ANP) has natriuretic and diuretic effects, synthesized and stored in the atrial cells, released in response to stretch of the atrial muscle during increase...
A smooth model for fiber lay-down processes and its diffusion approximations (2009)
Herty, M., Klar, A., Motsch, S., Olawsky, F.
In this paper we improve and investigate a stochastic model and its associated Fokker-Planck equation for the lay-down of fibers on a conveyor belt in the production process of nonwoven materials...
Parallel Tetrahedral Mesh Generation Based on A-priori Domain Decomposition (2008)
Evgeny Ivanov, Vom Fachbereich Mathematik, Erster Gutachter, Prof Dr, A. Klar
(Doctor rerum naturalium, Dr. rer. nat.) vorgelegte Dissertation.
Fügenschuh, A., Göttlich, S., Herty, M., Klar, A., Martin, A.
We introduce a continuous optimal control problem governed by ordinary and partial differential equations for supply chains on networks. We derive a mixed-integer model by discretization of the...
Lattice Boltzmann simulation of depth-averaged models in flow hydraulics (2008)
Klar, A., Seaid, M., Thömmes, G.
We apply a lattice Boltzmann method (LBM) for the simulation of depth-averaged models in flow hydraulics and dispersion of pollutants. The mathematical equations for these models can be obtained from...
Götz, T., Klar, A., Unterreiter, A., Wegener, R.
The stationary, isothermal rotational spinning process of fibers is considered. The investigations are concerned with the case of large Reynolds (delta = 3/Re 3 epsilon(2) no physical relevant...
Derivation of a kinetic model from a stochastic particle system (2008)
Degond, P., Goettlich, S., Klar, A., Seaid, M., Unterreiter, A.
We study a stochastic lattice particle system with exclusion principle. A kinetic equation and its diffusion limit are formally derived from the Monte Carlo dynamics. This derivation is investigated...
A Numerical Method For Nonstationary Transport Equations In Diffusive Regimes (2007)
An asymptotic-induced scheme for nonstationary transport equations with the diffusion scaling developed in [12] is presented. The scheme works uniformly for all ranges of mean free paths. It is based...
On the Connection of the Formulae for Entropy and Stationary Distribution (2007)
Y. Arkhipov, A. Klar, A. Klar, V. Vedenyapin
As it is well known in statistical physics the stationary distribution can be obtained by maximizing entropy. We show how one can reconstruct the formula for entropy knowing the formula for the...
A Class of Invariants for the Boltzmann Equation and the Broadwell Model (2007)
Y. Arkhipov, A. Klar, O. Mingalyov, V. Vedenyapin
A class of decreasing functionals for the Boltzmann equation and its discrete velocity models is investigated. The functionals under consideration are invariant for free motion and decreasing for...
2D and 3D upper bound solutions for tunnel excavation using 'elastic' flow fields. (2007)
Klar, A, Osman, A. S., Bolton, M. D.
This paper presents 2D and 3D upper bound solutions for the problem of tunnel excavation in soft ground. The solution invokes the use of incompressible flow fields derived from the theory of...
Götz, T., Klar, A., Marheineke, N., Wegener, R.
In this paper we present and investigate a stochastic model and its associated Fokker-Planck equation for the lay-down of fibers on a conveyor belt in the production process of nonwoven materials....
Hydrodynamic limit of a Fokker-Planck equation describing fiber lay-down processes (2007)
Bonilla, L., Götz, T., Klar, A., Marheineke, N., Wegener, R.
Modelling and optimization of supply chains on complex networks (2006)
Göttlich, S., Herty, M., Klar, A.
In this paper, we extend the model for supply chains developed in [8]. The model consists of partial differential equations governing the dynamics on each processor. Furthermore, a modelling of...
Frank, M., Hensel, H., Klar, A.
This paper represents a first step toward a moment method for dose calculations in radiotherapy. Starting from a deterministic transport model for electron radiation and its Fokker-Planck...
Optimal control for continuous supply network models (2006)
Kirchner, C., Herty, M., Göttlich, S., Klar, A.
We consider a supply network where the flow of parts can be controlled at the vertices of the network. Based on a coarse grid discretization provided in [6] we derive discrete adjoint equations which...
Network models for supply chains (2005)
Göttlich, S., Herty, M., Klar, A.
A mathematical model describing supply chains on a network is introduced. In particular, conditions on each vertex of the network are specified. Finally, this leads to a system of nonlinear...
Partial Moment Entropy Approximation to Radiative Heat Transfer ∗ (2005)
We extend the half moment entropy closure for the radiative heat transfer equations presented in [J. Comput. Phys. 180 (2002) 584] and [J. Comput. Phys. 198 (2004) 363] to multi-D. To that end we...
Monte Carlo Methods, M. Herty, A. Klar, L. Pareschi
In this paper we present a general derivation of kinetic models for traffic flows including different kind of interaction rules. We show that most kinetic models previously derived can be cast in the...
Multivalued Fundamental Diagrams And Stop And Go Waves For Continuum Traffic Equations (2004)
Günther, M., Klar, A., Materne, T., Wegener, R.
In the present paper a kinetic model for vehicular traffic leading to multivalued fundamental diagrams is developed and investigated in detail. For this model phase transitions can appear depending...
Multivalued fundamental diagrams and stop and go waves for continuum traffic flow equations (2003)
Günther, M., Klar, A., Materne, T., Wegener, R.
In the present paper a kinetic model for vehicular traffic leading to multivalued fundamental diagrams is developed and investigated in detail. For this model phase transitions can appear depending...
A Stability Notion for Lattice Boltzmann Equations (2003)
Banda Yong Klar, M. K. Banda, A. Klar
Lattice Boltzmann equations are usually constructed to satisfy some physical requirements like Galilean invariance and isotropy, to possess a velocity-independent pressure and no compressible eects,...
Multigroup Half Space Moment Approximations to the Radiative Heat Transfer Equations (2003)
R. Turpault, M. Frank, B. Dubroca, A. Klar
The half space moment approximation to the radiative heat transfer equations developed in [5] for frequency-independent absorption and scattering is extended to frequency-dependent coecients using...
Neue Untersuchungsergebnisse zum Phänomen "Schwarze Wohnungen" (2001)
Salthammer, T., Wensing, M., Klar, A., Ebert, P., Meinlschmidt, P., ...
The effect of suddenly appearing large-surface black deposits in living spaces (phenomenon of "Black Magic Dust") which has been increasingly observed in recent years has been examined systematically...
Numerical Passage from Radiative Heat Transfer to Nonlinear Diffusion Models (2001)
Klar Schmeis Er, A. Klar, C. Schmeiser
Radiative heat transfer equations including heat conduction are considered in the small mean free path limit. Rigorous results on the asymptotic procedure leading to the equilibrium diffusion...
Numerical Passage from Radiative Heat Transfer to Nonlinear Diffusion Models (2001)
Klar Schmeiser, A. Klar, C. Schmeiser
Radiative heat transfer equations including heat conduction are considered in the small mean free path limit. Rigorous results on the asymptotic procedure leading to the equilibrium diffusion...
Numerical Passage from Radiative Heat Transfer to Nonlinear Diffusion Models (2001)
Radiative heat transfer equations including heat conduction are considered in the small mean free path limit. Rigorous results on the asymptotic procedure leading to the equilibrium diffusion...
Muscular carnitine palmitoyltransferase II deficiency in infancy (2000)
Hurvitz, H., Klar, A., Korn-Lubetzki, I., Wanders, R.J.A., Elpeleg, O.N.
A. Klar, H. Neunzert, J. Struckmeier
In the paper we discuss the transition from kinetic theory to macroscopic fluid equations, where the macroscopic equations are defined as asymptotic limits of a kinetic equation. This relation can be...
F-Spondin is required for accurate pathfinding of commissural axons at the floor plate. (1999)
Burstyn-Cohen, T, Tzarfaty, V, Frumkin, A, Feinstein, Y, Stoeckli, E T, Klar, A
The commissural axons project toward and across the floor plate. They then turn into the longitudinal axis, extending along the contralateral side of the floor plate. F-spondin, a protein produced...
A Kinetic Model for Vehicular Traffic: Existence of stationary solutions (1999)
R. Illner, A. Klar, H. Lange, A. Unterreiter, R. Wegener
In this paper the kinetic model for vehicular traffic developed in [3, 4] is considered and theoretical results for the space homogeneous kinetic equation are presented. Existence and uniqueness...
An adaptive domain decomposition procedure for Boltzmann and Euler equation (1998)
In this paper we present a domain decomposition approach for the coupling of Boltzmann and Euler equations. Particle methods are used for both equations. This leads to a simple implementation of the...
In this paper domain decomposition methods for radiative transfer problems including conductive heat transfer are treated. The paper focuses on semi-transparent materials, like glass, and the...
Asymptotic Analysis And Coupling Conditions For Kinetic And Hydrodynamic Equations (1998)
This article is concerned with domain decomposition for kinetic and hydrodynamic equations. Coupling conditions at the interface between the equations are developed and investigated. In particular...
Enskog-like kinetic models for vehicular traffic (1997)
In the present paper a general critisicsm of kinetic equations for vehicular traffic is given. The necessity of introducing an Enskog-type correction into these equations is shown. An Enskog-like...
Enskog-Like Kinetic Models For Vehicular Traffic (1997)
In the present paper a general critisicsm of kinetic equations for vehicular traffic is given. The necessity of introducing an Enskog-type correction into these equations is shown. An Enskog-like...
A Kinetic Model For Vehicular Traffic Derived From A Stochastic Microscopic Model (1996)
A way to derive consistently kinetic models for vehicular traffic from microscopic follow the leader models is presented. The obtained class of kinetic equations is investigated. Explicit examples...
Identifizierung von Ladehilfsmitteln auf der Basis stochastischer Oberflächeninformationen (1995)
Das berührungslos arbeitende System des hier entwickelten Klassifizierungs- und Identifizierungsverfahrens ermöglicht, beliebige Ladungshilfsmittel aus Holz sicher zu erkennen und aus den...
Particle Methods: Theory and Applications (1995)
H. Neunzert, A. Klar, J. Struckmeier
In the present paper a review on particle methods and their applications to evolution equations is given. In particular, particle methods for Euler- and Boltzmann equations are considered. 0...
F. Golse, A. Klar, Key Words, Francois Golse, Axel Klar
Linear half space problems can be used to solve domain decomposition problems between Boltzmann and aerodynamic equations. A new fast numerical method computing the asymptotic states and outgoing...
Zeitgerecht kommissioniert - Verbesserung der Arbeitsqualität (1993)
Durch Umstellung auf automatische Kommissionierung werden die Kosten verringert, die Fehlerquote gesenkt, die Qualität erhöht und logistische Kennzahlen ermittelt. Das im Fraunhofer-Institut für...
Palettieren mit Roboter (1991)
Es wird ein Off-Line-Programmiersystem beschrieben, welches die Packmustererstellung und kollisionsfreie Bewegungsgenerierung für SCARA-Roboter ermöglicht. Die erzeugten Bewegungslisten liegen im...
Mit dem PC off-line programmieren (1991)
Es wird ein Off-Line-Programmiersystem beschrieben, welches die Packmustererstellung und kollisionsfreie Bewegungsgenerierung für SCARA-Roboter ermöglicht. Die erzeugten Bewegungslisten liegen im...
Lagerverwaltung und Lagersteuerung - oft reicht schon ein PC (1990)
Personal Computer werden in zunehmenden Maße auch für die Lagerverwaltungs- und Lagersteuerungsaufgaben eingesetzt. Bei der Entwicklung der Lagerhaussoftware wurde besonders berücksichtigt, daß...
Kommissionieren - Mann zu Ware (1990)
Kommissionieren von quaderförmigen Packstücken mit dem verfahrbaren Roboter "ROMEO". Aus den Aufträgen generiert der Leitrechner die Packmuster für die Kommissionierpalette, berechnet die...
Digitaler Lageregler flexibel einsetzbar (1988)
Für Positionierungsaufgaben in Bereichen mit hohen Anforderungen an Dynamik und Genauigkeit werden digitale Lageregler als Positioniersteuerungen von Servoantrieben verwendet. Die gewünschte...
The floor plate, a cell group that develops at the midline of the neural plate in response to inductive signals from the notochord, has been implicated in the control of dorsoventral neural pattern....
Ben-Shushan, E, Pikarsky, E, Klar, A, Bergman, Y
In this study we evaluate, for the first time, the molecular mechanism that underlies the extinction of a tissue-specific transcription factor, Oct-3/4, in somatic cell hybrids and compared it with...
Hicks, J, Strathern, J, Klar, A, Ismail, S, Broach, J
The SAD mutation, an extra mating type cassette, has been shown to arise from an unequal mitotic crossover between the MAT and HMR loci, resulting in the formation of a hybrid cassette and a...
Canaani, E, Dreazen, O, Klar, A, Rechavi, G, Ram, D, Cohen, J B, ...
The activation of the cellular oncogene c-mos in mouse plasmacytoma XRPC24 was found to result from the insertion of a 4.7-kilobase-pair cellular DNA element, within the c-mos coding region. The...
Four mating-type genes control sexual differentiation in the fission yeast.
Kelly, M, Burke, J, Smith, M, Klar, A, Beach, D
The mating-type region of fission yeast consists of three components, mat1, mat2-P and mat3-M, each separated by 15 kb. Cell-type is determined by the alternate allele present at mat1, either P in an...
The floor plate, a cell group that develops at the midline of the neural plate in response to inductive signals from the notochord, has been implicated in the control of dorsoventral neural pattern....
Ben-Shushan, E, Pikarsky, E, Klar, A, Bergman, Y
In this study we evaluate, for the first time, the molecular mechanism that underlies the extinction of a tissue-specific transcription factor, Oct-3/4, in somatic cell hybrids and compared it with...
Hicks, J, Strathern, J, Klar, A, Ismail, S, Broach, J
The SAD mutation, an extra mating type cassette, has been shown to arise from an unequal mitotic crossover between the MAT and HMR loci, resulting in the formation of a hybrid cassette and a...
Canaani, E, Dreazen, O, Klar, A, Rechavi, G, Ram, D, Cohen, J B, ...
The activation of the cellular oncogene c-mos in mouse plasmacytoma XRPC24 was found to result from the insertion of a 4.7-kilobase-pair cellular DNA element, within the c-mos coding region. The...
Four mating-type genes control sexual differentiation in the fission yeast.
Kelly, M, Burke, J, Smith, M, Klar, A, Beach, D
The mating-type region of fission yeast consists of three components, mat1, mat2-P and mat3-M, each separated by 15 kb. Cell-type is determined by the alternate allele present at mat1, either P in an...
The clinical course of bronchiolitis associated with acute otitis media
Shazberg, G., Revel-Vilk, S., Shoseyov, D., Ben-Ami, A., Klar, A., Hurvitz, H.
BACKGROUND—Acute otitis media (AOM) is the most common bacterial co-infection of viral bronchiolitis. AIMS—To evaluate the influence of AOM on the clinical course of...
This paper deals with domain decomposition methods for kinetic and drift diffusion semiconductor equations. In particular accurate coupling conditions at the interface between the kinetic and drift...
Atrial Natriuretic Peptide in Young and Elderly Children with Mild Gastroenteritis
Klar, A., Haver, E., Lichtstein, D., Hurvitz, H., Foah-Shauli, T.
Objective. Atrial Natriuretic Peptide (ANP) has natriuretic and diuretic effects, synthesized and stored in the atrial cells, released in response to stretch of the atrial muscle during increase...