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Auflistung nach Schlagwort "Computer simulation"

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Applying the variational principle to (1+1) dimensional relativistic quantum field theories

Haegeman, Jutho; Cirac, J. Ignacio; Osborne, Tobias J.; Verschelde, Henri; Verstraete, Frank (Trieste : International School for Advanced Studies, 2010)

We extend the recently introduced continuous matrix product state (cMPS) variational class to the setting of (1+1)-dimensional relativistic quantum field theories. This allows one to overcome the difficulties highlighted ...
Automated parametrical antenna modelling for ambient assisted living applications

Kazemzadeh, Reza; John, Werner; Mathis, Wolfgang (Göttingen : Copernicus GmbH, 2012)

In this paper a parametric modeling technique for a fast polynomial extraction of the physically relevant parameters of inductively coupled RFID/NFC (radio frequency identification/near field communication) antennas is ...
The benefit of 3D laser scanning technology in the generation and calibration of FEM models for health assessment of concrete structures

Yang, Hao; Xu, Xiangyang; Neumann, Ingo (Basel : MDPI AG, 2014)

Terrestrial laser scanning technology (TLS) is a new technique for quickly getting three-dimensional information. In this paper we research the health assessment of concrete structures with a Finite Element Method (FEM) ...
Comparison of order reduction algorithms for application to electrical networks

Radić-Weissenfeld, Ljubica J.; Ludwig, Stefan; Mathis, Wolfgang (Göttingen : Copernicus GmbH, 2009)

This paper addresses issues related to the minimization of the computational burden in terms of both memory and speed during the simulation of electrical models. In order to achieve a simple and computational fast model ...
Contact zone analysis based on multidexel workpiece model and detailed tool geometry representation

Boess, V.; Ammermann, C.; Niederwestberg, D.; Denkena, Berend (Amsterdam : Elsevier BV, 2012)

A new method for analyzing the tool-workpiece-contact area in cutting processes is presented. To gain enhanced knowledge about tool-workpiece interaction, determination of chip thickness, contact length and resulting ...
Description of the contract between a deterministic anisotropic tool surface and a workpiece subjected to plastic deformation

Rotarescu, M.-I. (London : SAGE Publications Ltd., 1998)

The finite element method offers an opportunity to obtain important information by simulating metal-forming processes. The description of the tool-workpiece interaction still remains a critical issue. The aim of this paper ...
Design improvements for increasing lifetime of single-shot coils applied at rotating workpieces

Schubotz, S.; Nacke, B. (Bristol : Institute of Physics Publishing, 2018)

In the industry, induction hardening of rotationally symmetrical workpieces by a single-shot process is a widespread method. Due to only partial superimposition of the workpiece areas to be heated by the coil, high power ...
Doppler Cooling and Trapping on Forbidden Transitions

Binnewies, T.; Wilpers, G.; Sterr, U.; Riehle, F.; Helmcke, J.; Mehlstäubler, T.E.; Rasel, Ernst Maria; Ertmer, Wolfgang (American Physical Society, 2001)

Ultracold atoms at temperatures close to the recoil limit have been achieved by extending Doppler cooling to forbidden transitions. A cloud of 40Ca atoms has been cooled and trapped to a temperature as low as 6μK by operating ...
Efficiency modeling for MHz DCDC converters at 40 v input voltage range

Wittmann, J.; Seidel, A.; Wicht, B. (Göttingen : Copernicus Publications, 2014)

Size and cost of a switched mode power supply can be reduced by increasing the switching frequency. This leads especially at a high input voltage to a decreasing efficiency caused by switching losses. Conventional calculations ...
Efficient passive network description of IC conducted emission models for model reduction

Ludwig, Stefan; Radić-Weissenfeld, Ljubica J.; Mathis, Wolfgang; John, W. (Göttingen : Copernicus GmbH, 2008)

This article adresses the model reduction of IC conducted emission models. A method to efficiently deal with the high number of independent sources in IC conducted emission models, which are a strong limitation for model ...
Energy flow in jerk-decoupled translatory feed axes

Denkena, Berend; Möhring, H.-C.; Hesse, P. (London : SAGE Publications Ltd., 2007)

This paper describes the energy flow in jerk-decoupled translatory feed axes. After an introductory survey on jerk-decoupled feed axes, a system simulation is presented. This system simulation includes a model of the ...
Exploring unconventional hubbard models with doubly modulated lattice gases

Greschner, Sebastian; Santos, Luis; Poletti, D. (College Park, MD : American Physical Society, 2014)

Recent experiments show that periodic modulations of cold atoms in optical lattices may be used to engineer and explore interesting models. We show that double modulation combining lattice shaking and modulated interactions ...
A first approach to the distortion analysis of nonlinear analog circuits utilizing X-parameters

Weber, Harry; Widemann, C.; Mathis, Wolfgang (Göttingen : Copernicus GmbH, 2013)

In this contribution a first approach to the distortion analysis of nonlinear 2-port-networks with X-parameters is presented. The X-parameters introduced by Verspecht and Root (2006) offer the possibility to describe ...
Hydrological model calibration for derived flood frequency analysis using stochastic rainfall and probability distributions of peak flows

Haberlandt, Uwe; Radtke, I. (Göttingen : Copernicus GmbH, 2014)

Derived flood frequency analysis allows the estimation of design floods with hydrological modeling for poorly observed basins considering change and taking into account flood protection measures. There are several possible ...
The influence of extreme events on hydrodynamics and salinities in the weser estuary in the context of climate impact research

Zorndt, Anna C.; Schlurmann, Torsten; Grabemann, Iris (Reston : American Society of Civil Engineers, 2012)

The salinity and its longitudinal distribution in the Weser estuary, Germany, has implications for water management as the estuarine water is needed, e.g., for irrigation of the agricultural used hinterlands and as industrial ...
Interferometer-Type Structures for Guided Atoms

Dumke, R.; Müther, T.; Volk, M.; Ertmer, Wolfgang; Birkl, G. (American Physical Society, 2002)

We experimentally demonstrate interferometer-type guiding structures for neutral atoms based on dipole potentials created by microfabricated optical systems. As a central element we use an array of atom waveguides being ...
Long wave propagation, shoaling and run-up in nearshore areas

Sriram, V.; Didenkulova, I.; Schimmels, Stefan; Sergeeva, A.; Goseberg, Nils (Reston : American Society of Civil Engineers (ASCE), 2014)

This paper discusses the possibility to study propagation, shoaling and run-up of these waves over a slope in a 300-meter long large wave flume (GWK), Hannover. For this purpose long bell-shaped solitary waves (elongated ...
Loss analysis and improvements of industrially fabricated Cz-Si solar cells by means of process and device simulations

Steingrube, S.; Wagner, Hannes; Hannebauer, Helge; Gatz, Sebastian; Chen, R.; Dunham, S.T.; Dullweber, Thorsten; Altermatt, Pietro P.; Brendel, Rolf (Amsterdam : Elsevier BV, 2011)

We model currently fabricated industrial-type screen-printed boron-doped Cz silicon solar cells using a combination of process and device simulations. The model reproduces the experimental results precisely and allows us ...
Macro-modelling via radial basis functionen nets

Wiegand, C.; Fischer, C.; Kazemzadeh, Reza; Hedayat, C.; John, W.; Hilleringmann, U. (Göttingen : Copernicus GmbH, 2008)

By the rising complexity and miniaturisation of the device's dimensions, the density of the conductors increases considerably. Referring to this, locally transient interactions between single physical values become apparent. ...
A mobility and traffic generation framework for modeling and simulating ad hoc communication networks

Barrett, Chris; Drozda, Martin; Marathe, Madhav V.; Ravi, S.S.; Smith, James P. (New York, NY : Hindawi Publishing Corporation, 2004)

We present a generic mobility and traffic generation framework that can be incorporated into a tool for modeling and simulating large scale ad hoc networks. Three components of this framework, namely a mobility data generator ...

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