URLIM - a Unified Radome Limitations Computer Program, Volume 1. Theoretical Background

1956 ◽  
Author(s):  
R. K. Frazer
Keyword(s):  
Computer Program ◽  
Theoretical Background

A New Method for Quantitative X-Ray Fluorescence Analysis of Mixtures of Oxides or Other Compounds by Empirical Parameter Methods

1982 ◽  
Vol 26 ◽  
pp. 351-354 ◽  
Author(s):  
Michael Mantler
Keyword(s):  
Computer Program ◽  
Chemical Elements ◽  
Fluorescence Analysis ◽  
Theoretical Background ◽  
New Method ◽  
Fundamental Parameter ◽  
Mathematical Methods ◽  
Empirical Parameter ◽  
X Ray ◽  
New Type

Two principal mathematical methods are used for quantitative XRFA: fundamental parameter calculations and the evaluation of empirical parameter equations. A comprehensive computer program based upon fundamental parameter equations was introduced in 1976 by D. Laguitton and M. Mantler (LAMA-I) and improved by T. C. Huang in 1979 (LAMA-II). The present paper describes the features of the theoretical background of a computer program using a new type of empirical (alpha*-) parameter equations. It is essentially designed for convenient analysis of compounds including those containing chemical elements, that cannot be directly measured by conventional X-ray spectrometers, such as oxides, nitrides, and others. The program also communicates automatically with LAMA in order to establish theoretical tables of alpha*-coefficients as well as conventional alpha-coefficients.

Paper 10: A Computer Program for Calculating the Performance of an Internal Combustion Engine Exhaust System

1967 ◽  
Vol 182 (12) ◽  
pp. 91-108 ◽  
Author(s):  
R. S. Benson
Keyword(s):  
Computer Program ◽  
Internal Combustion Engine ◽  
Method Of Characteristics ◽  
Combustion Engine ◽  
Exhaust System ◽  
Theoretical Background ◽  
Experimental Measurements ◽  
Design Calculation ◽  
Exhaust Pipe ◽  
Engine Exhaust

The paper describes the method of presenting data for a computet program, based on the method of characteristics, which calculates the pressure and temperature in the exhaust system and cylinders in two- or four-stroke engines with valves or ports. The program is arranged so that the performance of an exhaust pipe can be assessed for a number of pipe configurations. A brief description of the theoretical background and program format is given, followed by a suggested design calculation procedure. Examples are then given of the application of the program to both two- and four-stroke supercharged engines. The results of the calculation are compared with experimental measurements. A description of the subroutines and the organization of a calculation on the computer, together with the data order are given in two of the appendices.

scholarly journals A contribution to the dynamic simulation of robot manipulator with the software RobotDyn

2004 ◽  
Vol 26 (4) ◽  
pp. 215-225
Author(s):  
Nguyen Van Khang ◽  
Do Thanh Tung
Keyword(s):  
Computer Program ◽  
Dynamic Simulation ◽  
Multibody Systems ◽  
Degrees Of Freedom ◽  
Robot Manipulator ◽  
Theoretical Background ◽  
Tree Structures ◽  
Lagrange’S Equations ◽  
Lagrange's Equations

Robots manipulators are multibody systems with tree structures. In this paper the theoretical background of the computer program RobotDyn is presented. The program is developed using Lagrange's equations and Denavit-Hartenberg matrix. The dynamic simulation of the Robot SCARA with four degrees of freedom is considered as an example of application of the program RobotDyn.

scholarly journals CoxIter – Computing invariants of hyperbolic Coxeter groups

2015 ◽  
Vol 18 (1) ◽  
pp. 754-773 ◽  
Author(s):  
R. Guglielmetti
Keyword(s):  
Computer Program ◽  
Euler Characteristic ◽  
Coxeter Groups ◽  
Source Code ◽  
Theoretical Background ◽  
Combinatorial Structure ◽  
Fundamental Polyhedron ◽  
Supplementary Material

CoxIter is a computer program designed to compute invariants of hyperbolic Coxeter groups. Given such a group, the program determines whether it is cocompact or of finite covolume, whether it is arithmetic in the non-cocompact case, and whether it provides the Euler characteristic and the combinatorial structure of the associated fundamental polyhedron. The aim of this paper is to present the theoretical background for the program. The source code is available online as supplementary material with the published article and on the author’s website (http://coxiter.rgug.ch).Supplementary materials are available with this article.

A general computer program for the extended plate overlap algorithm

1978 ◽  
Vol 48 ◽  
pp. 287-293 ◽  
Author(s):  
Chr. de Vegt ◽  
E. Ebner ◽  
K. von der Heide
Keyword(s):  
Computer Program ◽  
Simultaneous Determination ◽  
General Computer Program ◽  
General Computer

In contrast to the adjustment of single plates a block adjustment is a simultaneous determination of all unknowns associated with many overlapping plates (star positions and plate constants etc. ) by one large adjustment. This plate overlap technique was introduced by Eichhorn and reviewed by Googe et. al. The author now has developed a set of computer programmes which allows the adjustment of any set of contemporaneous overlapping plates. There is in principle no limit for the number of plates, the number of stars, the number of individual plate constants for each plate, and for the overlapping factor.

Structures and crystallization of vacuum-deposited amorphous Se and Sb films

1990 ◽  
Vol 48 (4) ◽  
pp. 140-141
Author(s):  
Makoto Shiojiri ◽  
Toshiyuki Isshiki ◽  
Tetsuya Fudaba ◽  
Yoshihiro Hirota
Keyword(s):  
Monte Carlo ◽  
Electron Microscope ◽  
Monte Carlo Method ◽  
Computer Program ◽  
Radial Distribution ◽  
Film Formation ◽  
Amorphous State ◽  
Two Dimensional ◽  
Amorphous Films ◽  
Binding Condition

In hexagonal Se crystal each atom is covalently bound to two others to form an endless spiral chain, and in Sb crystal each atom to three others to form an extended puckered sheet. Such chains and sheets may be regarded as one- and two- dimensional molecules, respectively. In this paper we investigate the structures in amorphous state of these elements and the crystallization.HRTEM and ED images of vacuum-deposited amorphous Se and Sb films were taken with a JEM-200CX electron microscope (Cs=1.2 mm). The structure models of amorphous films were constructed on a computer by Monte Carlo method. Generated atoms were subsequently deposited on a space of 2 nm×2 nm as they fulfiled the binding condition, to form a film 5 nm thick (Fig. 1a-1c). An improvement on a previous computer program has been made as to realize the actual film formation. Radial distribution fuction (RDF) curves, ED intensities and HRTEM images for the constructed structure models were calculated, and compared with the observed ones.

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