The paper describes molecular-dynamic modules and the graphical user interface of the computer code-SAGE MD. Algorithms for numerical solution of equations of motion and approaches used in representing interatomic int...
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The paper describes molecular-dynamic modules and the graphical user interface of the computer code-SAGE MD. Algorithms for numerical solution of equations of motion and approaches used in representing interatomic interaction potentials are described and discussed. A few representative cases were chosen to illustrate application of the code to the derivation of properties of materials with different types of chemical bonding. (C) 2003 Elsevier B.V. All rights reserved.
The quality of measurements depends directly on the quality of the measurement system model. With this concern, novel hybrid modelling techniques have been formulated for model performance enhancement. Air-gauge focus...
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The quality of measurements depends directly on the quality of the measurement system model. With this concern, novel hybrid modelling techniques have been formulated for model performance enhancement. Air-gauge focus system sensor modelling has been accomplished by theoretical and empirical data integration. These modelling techniques combine a priori knowledge in theoretical model elaboration, and to attain the enhanced levels of adequacy, accuracy and precision they approximate the exact unknown model, simultaneously by available theoretical and appropriate polynomial empirical functions. For such a hybrid model the solution of two approaches by means of linear transformation and successive linear and nonlinear transformations have been developed. The validations of elaborated air-gauge sensor models revealed that sensor hybrid model solving by successive linear and nonlinear transformations permits us to attain minimum discrepancy with empirical evidence for the whole region of interest for model predictor variables.
The analysis of elastic scattering cross sections in terms of the Optical Model is subject to a series of well known ambiguities. Diverse assumptions about the initial values or shape of the potentials frequently prod...
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The analysis of elastic scattering cross sections in terms of the Optical Model is subject to a series of well known ambiguities. Diverse assumptions about the initial values or shape of the potentials frequently produce different parameters, leading to different physical interpretations of the observed data. It would be important to have a starting set of "user independent" optical potentials that fit the experimental data to allow the evaluator to consider a large array of possibilities before committing to a particular optical potential. This work presents a Genetic Algorithm (GA) code that simulates natural selection and evolution, allowing a "blind search" of the multiparametric chi(2) surface. In this GA, the genes subject to evolution are the parameters of the optical potential. The GA variables, operators and procedures are described, and the GA is applied to two cases in which the elastic scattering cross section is adjusted: one for the Li-7 + Al-27 system at energies close to the Coulomb barrier where the interaction occurs near the nuclear surface, and another for the O-16 + O-16 system where the two nuclei deeply interpenetrate each other. Further developments are described. (C) 2011 Elsevier B.V. All rights reserved.
An expression is provided for the expectation of sample central moments. It is practical and offers computational advantages over the original form due to Kong (The American Statistician, 65, 2011, 198-199).
An expression is provided for the expectation of sample central moments. It is practical and offers computational advantages over the original form due to Kong (The American Statistician, 65, 2011, 198-199).
This paper provides information on the models of the MAVR-TA code, associated with modeling of the fission products transport in the primary circuit and inside the containment. The paper provides information on the sy...
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This paper provides information on the models of the MAVR-TA code, associated with modeling of the fission products transport in the primary circuit and inside the containment. The paper provides information on the system of the equations which is solved to describe the fission products transport in the primary circuit and inside the containment. The velocity equations for 6 deposition processes (sedimentation, thermophoresis, diffusiophoresis, Brownian diffusion, turbulent diffusion and turbulent impaction) and 4 agglomeration processes (Brownian agglomeration, gravitational agglomeration, turbulent shear and inertial agglomerations) are provided. This paper also provides information about MAVR-TA code validation for MARVIKEN ATT-2b experiment and FALCON ISP-1 and ISP-2 experiments for the primary circuit and MAVR-TA code validation for PHEBUS-FP and VANAM-M3 experiments for the containment.
To calculate nonlinear transport of space charge dominated beam in 6D phase spaces, a computer code package LEADS-v5 (Linear and Electrostatic Accelerator Dynamics Simulations) has been developed. The codes calculate ...
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To calculate nonlinear transport of space charge dominated beam in 6D phase spaces, a computer code package LEADS-v5 (Linear and Electrostatic Accelerator Dynamics Simulations) has been developed. The codes calculate particle motions in the beam transport systems consisting of electrostatic and magnetic focusing lenses, ion analyzers, multipoles and RF accelerating structures. The nonlinear forces of external electric/magnetic fields are analyzed by the Lie algebraic method, and the space charge forces are obtained by the particle in cell (PIC) scheme. In the codes, Uniform and Gaussian particle distributions can be chosen to generate randomly the particle initial coordinates. The optimization procedures are provided to make the beam optics designs reasonable and fast. Graphically displays of calculated results are provided.
The radiation environment inside and near spacecraft consists of various components of primary radiation in space and secondary radiation produced by the interaction of the primary radiation with the walls and equipme...
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The current activity envisages the evaluation of radial temperature distribution in mixed oxide fuels (MOX) using two computer codes: finite element commercial computer code ANSYS and the thermo-mechanical computer pr...
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ISBN:
(纸本)9781728115320
The current activity envisages the evaluation of radial temperature distribution in mixed oxide fuels (MOX) using two computer codes: finite element commercial computer code ANSYS and the thermo-mechanical computer program, TRANSURANUS, developed by the Institute for Transuranium Elements (ITU), Karlsruhe, Germany. In this paper, was introduced RADAR (RAting Depression Analysis Routine) model of Palmer - 1982 in ANSYS code, in order to asses radial power distribution in MOX fuel. Moreover, present work involves also the implementation, in both codes, of a thermal conductivity correlation, taken from the literature. When a model or correlation is incorporated into a computer code, the user become responsible for its maintenance. Therefore, in this paper, verification by comparisons with experiment and code-to-code comparison are provided. The use of RADAR model along with HALDEN thermal conductivity correlation, proved to be fast and reliable. The overall picture indicates adequate TRANSURANUS and ANSYS simulations, against experimental data.
The authors continue to study the influence of the tsunami source parameters on the distribution of the wave maximal heights along the nearest coastline. Numerical tests are based on the real digital bathymetry at sou...
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ISBN:
(纸本)9781728114507
The authors continue to study the influence of the tsunami source parameters on the distribution of the wave maximal heights along the nearest coastline. Numerical tests are based on the real digital bathymetry at southern part of Japan. Mesh step is compared to 300 m in both directions. Certainly, it is not enough for inundation mapping, but quite suitable for fast evaluation of positions of wave maximal heights. All numerical tests were arranged at regular PC with a hardware accelerator, based on Field Programmable Gates Array microchip (FPGA). As was observed, both position of the sea bed initial displacement and the shape of such displacement are important. Observed phenomenon is discussed in numbers.
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