• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 1119
  • 514
  • 326
  • 61
  • 61
  • 61
  • 61
  • 61
  • 60
  • 51
  • 40
  • 27
  • 26
  • 17
  • 16
  • Tagged with
  • 2614
  • 2614
  • 501
  • 358
  • 314
  • 295
  • 258
  • 257
  • 207
  • 187
  • 180
  • 179
  • 176
  • 150
  • 139
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
41

Multiprocessing in nuclear plant simulation

Cue, R. J. January 1987 (has links)
No description available.
42

A real-time rope model suitable for game engine usage

Garrido, Randy A. 09 1900 (has links)
Approved for public release; distribution is unlimited / This thesis attempts to lay a foundation for producing a real-time rope model suitable for game engine usage. The model presented here is only one of the many possible approaches in modeling a rope. The basic premise used was derived from Erkin Tunca's source code. The concept is then attempted on the Open Dynamics Engine (ODE) built by Russell Smith. This work shows promise but much still needs to be done. This thesis only scratches the surface on the subject. In addition, ODE is primarily designed for (articulated) rigid bodies. Therefore, the next step is to create a deformable body (the rope) in ODE. / Major, United States Army
43

Agent-based simulation of robotic systems

Williams, Manoleto Z. 06 1900 (has links)
Approved for public release; distribution is unlimited / A goal and behavior agent layer Java Model was developed to simulate cruise, correct and avoid Control Modules in an autonomous agent (robot). The model was tested against a deterministic Figure of Merit (FOM) to predict a "best mix" of agents for the simplistic agent economy parameters given. Future works suggests validation of the model with real agents in a real economy. / Lieutenant, United States Navy
44

A comparison of computational cognitive models : agent-based systems versus rule-based architectures

Oeltjen, Craig L. 03 1900 (has links)
Approved for public release; distribution is unlimited / Increased operational costs and reductions in force size are two of the major factors driving the need for improved computer simulations within the military community. Human performance models are used in various aspects of simulation, including controlling computer generated forces, tactical decision aides, intelligent tutoring systems and new system design. This research makes a comparison between two categories of human performance models, multi-agent systems and rule-based architectures. Each type of model has its own strengths and weaknesses, and is therefore better suited for certain applications. Complex military simulations need human performance models that take advantage of the strengths of more than one type of model. The purpose of this research is to compare the implementation and performance of these two models, and to demonstrate the need for hybrid systems that employ the best aspects of models for a given situation. / Lieutenant Commander, United States Navy
45

Computational study of type II supernova explosion. / 第二類超新星爆發之電算模擬硏究 / Computational study of type II supernova explosion. / Di er lei chao xin xing bao fa zhi dian suan mo ni yan jiu

January 2000 (has links)
Lee Tak Wah = 第二類超新星爆發之電算模擬硏究 / 李德華. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2000. / Includes bibliographical references (leaf 78). / Text in English; abstracts in English and Chinese. / Lee Tak Wah = Di er lei chao xin xing bao fa zhi dian suan mo ni yan jiu / Li Dehua. / Abstract --- p.i / Acknowledgments --- p.iii / Contents --- p.iv / Chapter 1 --- Introduction --- p.1 / Chapter 1.1 --- A brief history of supernova --- p.1 / Chapter 1.2 --- Simulation of type II supernova --- p.3 / Chapter 2 --- Hydrodynamics --- p.6 / Chapter 2.1 --- Lagrangian hydrodynamics --- p.6 / Chapter 2.2 --- Finite difference representation --- p.7 / Chapter 2.3 --- Shock handling --- p.10 / Chapter 2.4 --- Stability and gravitation --- p.11 / Chapter 2.5 --- Test of the hydrodynamic code --- p.12 / Chapter 3 --- Equation of state --- p.17 / Chapter 3.1 --- Electrons and photons --- p.17 / Chapter 3.2 --- Nuclear equation of state --- p.20 / Chapter 3.2.1 --- Bulk energy --- p.21 / Chapter 3.2.2 --- Surface and Coulomb energy --- p.22 / Chapter 3.2.3 --- Nuclei to bubbles phase --- p.23 / Chapter 3.2.4 --- Translational energy --- p.24 / Chapter 3.2.5 --- Nucleons outside nuclei and α particles --- p.24 / Chapter 3.2.6 --- Nuclear statistical equilibrium --- p.25 / Chapter 3.3 --- Results along the isentropes --- p.26 / Chapter 4 --- Electrons and neutrinos behaviour --- p.40 / Chapter 4.1 --- Electron capture --- p.40 / Chapter 4.1.1 --- Electron capture on heavy nuclei --- p.41 / Chapter 4.1.2 --- Electron capture on free protons --- p.42 / Chapter 4.2 --- Neutrino leakage scheme --- p.43 / Chapter 5 --- Core collapse simulation --- p.45 / Chapter 5.1 --- Initial models --- p.45 / Chapter 5.2 --- General features of core collapse --- p.52 / Chapter 5.3 --- After the core bounce --- p.63 / Chapter 6 --- Discussion --- p.72 / Chapter 6.1 --- Conclusion --- p.72 / Chapter 6.2 --- Further development --- p.73 / Chapter A --- Artificial viscosity --- p.75 / Bibliography --- p.78
46

Numerical modelling and stability analysis of non-smooth dynamical systems vie ABESPOL

Chong, Antonio January 2016 (has links)
No description available.
47

Analysis of factors affecting crossdock operations using computer simulation.

January 2009 (has links)
Wong, Wing Shuet. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2009. / Includes bibliographical references (p. 86-88). / Abstract also in Chinese. / Table Of Contents --- p.i / Tables of Figures and Tables --- p.vi / Chapter Chapter 1. --- Introduction --- p.1 / Chapter 1.1 --- Distribution Strategies --- p.1 / Chapter 1.2 --- Motivation --- p.7 / Chapter 1.3 --- Problem Description --- p.9 / Chapter 1.4 --- Contributions --- p.11 / Chapter 1.5 --- Conclusion --- p.12 / Chapter Chapter 2. --- Literature Review --- p.13 / Chapter 2.1 --- Crossdocking in the supply chain --- p.13 / Chapter 2.2 --- Simulation of crossdocking --- p.16 / Chapter 2.3 --- Mathematic programming in crossdocking --- p.17 / Chapter 2.4 --- Conclusion --- p.29 / Chapter Chapter 3. --- Model Approach and Assumptions --- p.30 / Chapter 3.1 --- Simulation Modeling --- p.30 / Chapter 3.2 --- Model Assumptions --- p.31 / Chapter 3.3 --- Crossdocking in Arena® -Modules --- p.36 / Chapter 3.4 --- Conclusion --- p.43 / Chapter Chapter 4. --- Simulation Design --- p.44 / Chapter 4.1 --- Factors in Simulation --- p.44 / Chapter 4.2 --- Experimental Design --- p.53 / Chapter 4.3 --- Performance Measures --- p.56 / Chapter 4.4 --- Conclusion --- p.57 / Chapter Chapter 5. --- Results and Analysis --- p.58 / Chapter 5.1 --- Mean Hourly Throughput per Forklift (MTF) --- p.58 / Chapter 5.2 --- Mean Handling Time per Pallet (MHP) --- p.63 / Chapter 5.3 --- Comparison with original results --- p.65 / Chapter 5.4 --- Conclusion --- p.68 / Chapter Chapter 6. --- Conclusion and Recommendations For Future Work --- p.82 / Chapter 6.1 --- Conclusion --- p.82 / Chapter 6.2 --- Future research directions --- p.84 / References --- p.86
48

Instrument development and computational studies of time-of-flight mass spectrometers

Lewin, Mark James, Chemistry, Faculty of Science, UNSW January 2006 (has links)
A computer program to simulate peak shapes from time-of-flight (TOF) mass spectrometers has been developed and significantly improved from a previous, unpublished version. This program can accurately simulate both TOF and orthogonal acceleration TOF mass analyser peak shapes, with contributions from initial ion properties, instrument geometry, and other factors including high voltage ripple and detector response. Grid effects have also been included, and simulations for two mass spectrometers are compared to actual recorded spectra. The dispersive effect on ion trajectories of parallel wires and grids has been computationally studied and a model derived for each case. The model is based on the effect wire geometry has on the intrinsic focussing effect of the grid. The models for parallel wires and rectangular grids have been coded into the simulation program described above, and the effect of grids on peak shapes in TOF mass spectrometers has been studied. Good correlation between simulated and actual peak shapes for rectangular grids was obtained for grids in different rotational orientations. A pulsed lens has been developed to reduce the velocity spread of ions in matrix assisted laser desorption/ionisation (MALDI) ion sources, with the aim to increase sensitivity in orthogonal acceleration TOF mass analysers. The system gave an increase in sensitivity of approximately five times over a range of masses, however instrument resolving power was reduced. A rotating sample stage was developed for MALDI mass spectrometers which offers the potential of high sample density, high positional accuracy and repeatability, and low seek times. The system involves reading the position of a disk mounted with MALDI sample spots and timing the laser pulse to coincide with spot availability at an aperture. The system was successfully used to perform mass calibration by using a calibrant sample located on a separate spot to the analyte. Mass resolved disk imaging was also performed over a disk radius using inks. The mass resolved image compared well to the optical image.
49

Modeling microarchitecture simulator using object-oriented approach

Chan, Chung-lun 09 June 2000 (has links)
With the success of the CounterDataFlow Pipeline microarchitecture developed by Oregon State University, there is increasing demand for a highly flexible high-level simulator modeling tool to support the further expansions and studies of the Counterflow pipeline processors family. This work examines the implementation of a Java-based execution-driven simulator modeling tool, bBlocks, which gains flexibility by identifying the independent parts in a micro system and partitioning them into reusable blocks. Two simulators have been constructed to demonstrate the possibility of bBlocks. / Graduation date: 2001
50

Molecular dynamics at constant temperature and pressure

Decker, Mike W. 02 November 1995 (has links)
Molecular dynamics is a technique in which the trajectories of a group of particles are calculated as a function of time by integrating the equations of motion. In this thesis we study the use of molecular dynamics for atoms in a crystal. A model is introduced which describes interactions of a physical system with an external heat reservoir in molecular dynamics simulations. This is accomplished by the addition of a "virtual variable" to the Hamiltonian which is used to scale time. Aspects of this model are discussed and examples are presented for a simple system. Similarly, a constant pressure model is introduced in which additional virtual volume variables are added to the Hamiltonian. The volume and shape of the molecular dynamics cell are now free to vary. Simple examples are discussed. Aspects of the computer programs and the algorithms are explained. Particular attention is focused on the methods used to integrate the equations of motion and to calculate the coulomb interactions. Examples of simulations using a zirconium oxide crystal are presented. We study the effects of heat bath and pressure bath simulations, both separately and in combination. Various features of the behavior are investigated with the primary focus on phase changes, numerical errors, and parameters describing the heat and pressure baths. / Graduation date: 1996

Page generated in 0.1458 seconds