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Статті в журналах з теми "UNIX FORTRAN (Computer program language)"
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Raman, K. V. "Some Features of Java Language Illustrated through Examples from Chemistry." Mapana - Journal of Sciences 1, no. 2 (July 3, 2003): 22–56. http://dx.doi.org/10.12723/mjs.2.5.
Повний текст джерелаАнотація:
Computer programming has been used effectively by theoretical chemists and organic chemists to solve various types of problem in chemistry. Initially the languages used for computations in chemistry were FORTRAN and BASIC. Later the Pascal language was used for solving problems in chemistry and physics. Recently the languages C and C++ and Java have been used to solve problems in chemistry. In this paper I will illustrate features of C, C++ choosing examples from chemistry. Computer programming has been used effectively by theoretical chemists and organic chemists to solve various types of problem in chemistry. Initially the languages used for computations in chemistry were FORTRAN and BASIC. Later the Pascal language was used for solving problems in chemistry and physics. Recently the languages C and C++ and Java have been used to solve problems in chemistry. In this paper I will illustrate features of C, C++ choosing examples from chemistry. Some examples presented in this these languages are Program to calculate reduced mass of homo diatomic or hetero diatomic Program to calculate the molecular weight of a tetra atomic system ABCD Program to calculate NMR frequencies of spin 1/2 nuclei only Program to calculate NMR and ESR frequencies The examples presented in Java 2 are Program to calculate unit cell dimension of a crystal Program to generate the chair form and boat form of cyclohexane. The examples presented in this monograph will help researchers in theoretical chemistry and organic chemistry to develop their own software.
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Stringer, James C., L. Kent Thomas, and Ray G. Pierson. "Efficiency of D4 Gaussian Elimination on a Vector Computer." Society of Petroleum Engineers Journal 25, no. 01 (February 1, 1985): 121–24. http://dx.doi.org/10.2118/11082-pa.
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Abstract The efficiency of D4 Gaussian elimination on a vector computer, the Cray- 1/S, it examined. The algorithm used in this work is employed routinely in Phillips Petroleum Co. reservoir simulation models. Comparisons of scalar Phillips Petroleum Co. reservoir simulation models. Comparisons of scalar and vector Cray-1/S times are given for various example cases including multiple unknowns per gridblock. Vectorization of the program on the Cray- 1/S is discussed. Introduction In reservoir simulation, the solution of large systems of linear equations accounts for a substantial percentage of the computation time. Methods used today consist of both iterative and direct solution algorithms. Because of the theoretical savings in both storage and computing labor, D4 Gaussian elimination is a popular direct solution algorithm and is used widely on conventional scalar computers. In this paper we investigate the efficiency of the D4 algorithm on a computer with vector processing capabilities-the Cray-1/S. The D4 (or alternate diagonal) algorithm originally was presented by Price and Coats in 1973. Since that time much work has been done on the Price and Coats in 1973. Since that time much work has been done on the algorithm including an investigation by Nolen on the vector performance of D4 on the CDC Star 100 and Cyber 203 on single-unknown-per-gridblock example cases. Levesque has presented a comparison of the Cray-1 and Cyber 205 in reservoir simulation that includes the D4 algorithm. Vector performance of the Cray-1 on linear algebra kernels, both sparse and dense, performance of the Cray-1 on linear algebra kernels, both sparse and dense, also has been reported. Vector performance on these kernels typically is expressed in terms of million floating point operations per second (MFLOPS). Our objective here is to evaluate vector performance on a typical production code written in FORTRAN for a scalar computer. Therefore, performance, or efficiency, will be evaluated in terms of both scalar and vector CPU times on the Cray-1/S. We include vector performance on the original code with automatic vectorization enabled, and vector performance on the same code with minor restructuring, automatic performance on the same code with minor restructuring, automatic vectorization enabled, and the use of Cray assembly language (CAL) basic linear algebra kernels. Example cases for multiple unknowns per gridblock are presented. Reservoir Flow Equations The reservoir flow equations written using a seven-point finite difference formulation can be expressed as ...........................(1) where the terms A, B... G are matrices of order N equal to the number of unknowns per gridblock. represents the vector of unknowns at cell i, j, k, and H is the vector of residuals of the flow equations at cell i, j, k at iteration . Values of N from 1 to 10 typically are encountered depending on the type of simulator and the degree of implicitness used. For example, N is equal to one for an implicit pressure, explicit saturation (IMPES) black-oil model; three for a fully implicit black-oil model; five for an implicit three-component steamflood model and usually 10 or less for an implicit compositional model. Driver Program To facilitate timing studies in this work, a driver program was written to calculate coefficients for the D4 Gaussian elimination routine. Input to the program consists of grid dimensions and the number of unknowns per gridblock. All elements of the off-diagonal matrices (A, C, D... G) were set equal to 1. To guarantee a nonsingular solution, the B matrix was set equal to -5 for one unknown and as below for N unknowns. ............................(2) Right-side coefficients, H, were calculated by assuming a unit solution for . No-flow boundary conditions were used, which require specific matrices, such as A for I = 1 and C for I = NX, to be set equal to zero. Description of Hardware and Software All run times reported in this work were obtained on the Cray-1/S, Serial No. 23, at United Computing Systems in Kansas City, MO. Serial No. 23 contains 1 million 64-bit words of central memory interleaved in 16 memory banks and no input/output (I/O) subsystems. The FORTRAN compiler used was CFT 1.09. CPU times were obtained by calling SECOND, a FORTRAN-callable utility routine that returns CPU time since the start of the job in FPS'S. CPU overhead incurred for each call to SECOND is approximately 2.5 microseconds. For all reported Cray-1/S times, "vector" refers to the original FORTRAN code run with automatic vectorization enabled, which is the normal operating mode. SPEJ p. 121
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Gabe, E. J., Y. Le Page, J. P. Charland, F. L. Lee, and P. S. White. "NRCVAX – an interactive program system for structure analysis." Journal of Applied Crystallography 22, no. 4 (August 1, 1989): 384–87. http://dx.doi.org/10.1107/s0021889889003201.
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NRCVAX is a complete system of programs, covering all aspects of crystal structure analysis from data reduction to the presentation of results. The system, which is written in a `neutral' Fortran 77, presently exists in two forms. The first runs on a VAX computer under VMS, on an 80386 PC under UNIX and under IBM VM/CMS and MVS/TSO. The second is an adaptation which runs on PC-XT, AT, PS/2 and comparable microcomputers under MS-DOS. The two versions differ somewhat in structure, but very little in code, operation or functionality except for the graphics. The many options of the programs can be selected in a highly interactive manner and because of this the system is very flexible. Most options are assigned default values, however, and it is usually safe to run the routines with a minimum of user input using the defaults. The system will accept data from a wide variety of sources and has interface routines for several other systems. Graphics in the VAX/UNIX version are based on the widely available Tektronix 4000 series protocol, while the microcomputer version supports most common display adapters. It is also possible to prepare files for a variety of plotters, dot-matrix printers and laser printers. Source code is distributed and it should not be difficult to adapt the system to any computer with virtual memory and a Fortran 77 compiler.
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A. AbdulKareem, Mishaal. "Experimental Investigation and Mathematical Modelling of Pressure Response for Steam Generator." International Journal of Engineering & Technology 7, no. 4.19 (November 27, 2018): 960. http://dx.doi.org/10.14419/ijet.v7i4.19.28077.
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Cold startup of boiler is the process of boiler operation with water at ambient temperature and pressure with all intake and discharge valves are fully closed to permit fast development of pressure. A mathematical model is developed to estimate the pressure response during cold startup of a perfectly insulated steam generator unit. A commercial type pressure switch is used in this unit to control and maintain the desired set point of the steam operating pressure. This mathematical model assume that the thermal properties of the supplied liquid water are temperature dependent. It is based on a novel Pressure Marching Technique that is coded using a FORTRAN language computer program. The maximum percentage error of (8.24 %) was obtained when comparing the predicted results of the mathematical model with the measured values obtained from the experimental test that was done using a (2 kW) electric steam generator unit with a volume of (30 litter) and maximum operating pressure of (8 bar). In addition, the same behavior of the predicted results was obtained when compared with results of a previously published article. It was found that the time constant of the pressure control system is directly proportional with its operating pressure set point and with the volume of the steam generator and its void fraction. A (50%) increase in the pressure set point will increase the time constant by (66.16%). Increasing the boiler volume by (166.667%) will increase the time constant by (166.677%) and increasing the boiler void fraction by (150%) will increase the time constant by (23.634%). The time constant is inversely proportional with the heating power of the steam generator. A (100%) increase in the heating power will decrease the time constant by (50%). The time constant is independent of the initial water temperature. Also, it was found that the time delay to start water evaporation is directly proportional with the volume of the steam generator. A (166.667%) increase in boiler volume will increase the time delay by (166.65%). The time delay is inversely proportional with the initial water temperature and with the heating power and void fraction of the steam generator. A (38.889%) increase in the initial water temperature will decrease the time delay by (8.882%). Increasing the heating power by (100%) will decrease the time delay by (50%) and increasing the boiler void fraction by (150%) will decrease the time delay by (16.665%). The time delay is independent on the operating pressure set point.
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Evripidou, Paraskevas, and Robert Barry. "Mapping Fortran Programs to Single Assignment Semantics for Efficient Parallelization." Parallel Processing Letters 08, no. 03 (September 1998): 407–18. http://dx.doi.org/10.1142/s0129626498000419.
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This paper presents Mustang, a system that automatically parallellizes Fortran programs by mapping them to single assignment semantics. Specifically, sequential Fortran source programs are translated into IF1, a machine-independent dataflow graph description language that is the intermediate form for the SISAL language. During this translation, Parfrase 2 is used to parse the source program perform dependency analysis and to detect opportunities for parallelization which are then explicitly introduced into the IF1 program. The resulting IF1 program is then processed by the Optimizing SISAL Compiler which produces parallel executables on multiple target platforms. A working prototype has been developed and tested. The execution results of several Livermore Loops are presented and compared against Fortran and SISAL implementations on two different platforms. The initial results obtained provide proof of concept that Fortran can be mapped to Single Assignment Semantics without sacrificing efficiency.
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Amyot, Joseph R., and Gerard van Blokland. "Parameter optimization with ACSL models." SIMULATION 49, no. 5 (November 1987): 213–18. http://dx.doi.org/10.1177/003754978704900505.
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A method whereby a parameter optimization program, written in FORTRAN, can be used in conjunction with ACSL (Advanced Continuous Simulation Language) models of dynamic systems is described. The optimization of a projectile's trajectory is used as an example.
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COOK, G. O. "ALPAL, A PROGRAM TO GENERATE PHYSICS SIMULATION CODES FROM NATURAL DESCRIPTIONS." International Journal of Modern Physics C 01, no. 01 (April 1990): 1–51. http://dx.doi.org/10.1142/s0129183190000025.
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A Livermore Physics Applications Language (ALPAL), a new computer language, is described. ALPAL is a tool that generates a Fortran code module from a natural description of a physics model. This capability gives the computational physicist a significant productivity boost. While ALPAL is a working computer program, significant additions are being made to it. Some of the factors that make ALPAL an important tool are: first, it eliminates many sources of errors; second, it permits building program modules with far greater speed than is otherwise possible; third, it provides a means of specifying many numerical algorithms; and fourth, it is a language that is close to a journal-style presentation of physics models and numerical methods for solving them. In sum, ALPAL is designed to magnify the abilities and creativity of computational physicists.
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GENOT, MARC. "APPLICATIONS OF 1-D MAP FROM CHUA'S CIRCUIT: A PICTORIAL GUIDE." Journal of Circuits, Systems and Computers 03, no. 02 (June 1993): 375–409. http://dx.doi.org/10.1142/s0218126693000241.
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This paper is written as a tutorial on how to use a one-dimensional map derived from Chua's circuit to study the circuit's complicated dynamics. While the derivation of this 1-D map is nontrivial, a user-friendly program is presented to help the beginner uncover and witness, without any prior background on chaos, numerous periodic, homoclinic, heteroclinic and chaotic orbits. In keeping with the pedagogical nature of this paper, these bifurcation phenomena will be profusely illustrated with pictures generated from a computer program, along with the exact parameters so that the reader can easily duplicate them. The program is written in the C-language for both PC-486 computers and UNIX workstations, and available upon requests from the Nonlinear Electronic Laboratory in Berkeley.
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Li, Hong Ru, Fei Feng, and Qing Wang. "Design and Application of Concrete Faced Rock-Fill Dam Numerical Simulation Analysis Program." Advanced Materials Research 594-597 (November 2012): 1882–87. http://dx.doi.org/10.4028/www.scientific.net/amr.594-597.1882.
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Reviewed the various constitutive mode of concrete faced rock-fill dam. Basis on the complex physical characteristic of filled the material and the framework of dam, a method of computer is given, introduced into the program of the concrete face rock-fill dam calculation with FORTRAN language on the ANSYS software. It is used to simulate two and three-dimensional nonlinear computation and compute figure simulation in the construction procedure and operation period for the concrete face rock fill dam, the result was intuitionist clarity.
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Farthing, I., G. Love, VD Scott, and CT Walker. "A new and versatile computer program for correcting EPMA data." Proceedings, annual meeting, Electron Microscopy Society of America 50, no. 2 (August 1992): 1658–59. http://dx.doi.org/10.1017/s0424820100132923.
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A new computer program has been developed to convert electron probe microanalysis data into accurate measurements of chemical composition. It is menu-based and designed to operate off-line using any IBM PC compatible computer. As shown in the flowchart, fig. 1, the architecture is modular and the programming language adopted is a compilable version of BASIC which possesses much of the processing speed associated with FORTRAN or C. Specimens containing up to fifteen elements, with 4 ≤ Z ≤ 96, can be handled and all the major x-ray lines (Kα, Kβ, Lα, L(β, Mα and Mβ) are available for analysis purposes.The procedure itself is based upon the classical ZAF approach in which corrections for atomic number (Z), x-ray absorption (A), characteristic fluorescence (Fl) and continuum fluorescence (F2) are treated independently. The factors dealing with fluorescence are essentially those of Reed (characteristic) and Springer (continuum) although both contain minor updates. However, the atomic number and absorption factors are the authors' own and the latter, developed from a quadrilateral representation of the x-ray distribution with depth in a solid, distinguishes this program from others.
Дисертації з теми "UNIX FORTRAN (Computer program language)"
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Santavicca, Jeffery W. "Fluid mechanics tutorials in GKS supported FORTRAN." Thesis, This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-09122009-040300/.
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Tollefson, Bradley A. "The J-shell command language interpreter." Virtual Press, 1985. http://liblink.bsu.edu/uhtbin/catkey/506686.
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A command language interpreter (CLI) translates commands entered by the user into system actions. The shell is a specific type of CLI that was originally designed and used with UNIX operating systems.The author proposes to design and implement a shell-like CLI on top of the VMS operating system. The shell will enhance VMS features by providing an easier to use syntax and by providing features that are not currently available through VMS. These features include piping facilities and the ability to enter and/or reference multiple commands from a single command line. A language reference manual is provided with the J-shell. This manual explains the features and commands of the J-shell.
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Hanson, Clyde Russell 1959. "Implementation of Fletcher-Reeves in the GOSPEL optimization package." Thesis, The University of Arizona, 1989. http://hdl.handle.net/10150/277144.
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Implementation of the Fletcher-Reeves optimization strategy into the GOSPEL optimization package is examined. An explanation of the GOSPEL package is provided, followed by the presentation of the Fletcher-Reeves strategy. Performance of all strategies in the updated GOSPEL package are compared for nine test cases. A user manual for GOSPEL operation as well as the source code are also included.
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Reid, Darryl. "The design and implementation of a large scientific code using FORTRAN 90 /." Internet access available to MUN users only, 2003. http://collections.mun.ca/u?/theses,159602.
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Dietrich, Gregory L. "Adapting a portable SIMULA compiler to Perkin-Elmer computers in a UNIX environment." Thesis, Kansas State University, 1986. http://hdl.handle.net/2097/9910.
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Chabot, Éric. "Parallélisme et communications dans les applications scientifiques (fortran) /." Thèse, Chicoutimi : Université du Québec à Chicoutimi, 1993. http://theses.uqac.ca.
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Shear, Raymond F. "Implementation of a Modula 2 subset compiler supporting a "C" language interface using commonly available UNIX tools /." Online version of thesis, 1989. http://hdl.handle.net/1850/10505.
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Merritt, John W. "Distributed file systems in an authentication system." Thesis, Kansas State University, 1986. http://hdl.handle.net/2097/9938.
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Craddock, David M. "A FORTRAN 77 simulation of a low temperature storage freezer utilizing a non-azeotropic refrigerant blend." Ohio : Ohio University, 1995. http://www.ohiolink.edu/etd/view.cgi?ohiou1179341435.
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Mendoza, Marin Florentino Lazaro. "Modelagem, simulação e analise de desempenho de reatores tubulares de polimerização com deflectores angulares internos." [s.n.], 2004. http://repositorio.unicamp.br/jspui/handle/REPOSIP/267665.
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Orientadores: Rubens Maciel Filho, Liliane Maria Ferrareso LonaTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Quimica
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Resumo: O modelo determinístico e processo homopolimerização na emulsão do estireno são aplicados em reator tubular contínuo sem e com deflectores angulares internos sob condição isotérmica e não isotérmica. Os resultados de modelagem e simulação foram realizados a estado estacionário, modelo unidimensional, coordenada cilíndrica, fluxo pistão laminar completamente desenvolvido, modelo Smith-Ewart para estimar a conversão do monômero, cinética química de Arrhenius corno modelo de velocidade finita laminar para computar a geração química. O objetivo é modelar, simular e analisar o comportamento do reator de homopolimerização na emulsão do estireno com deflectores angulares inclinados internos, e comparar com reator tubular. Os métodos experimental e matemático-dedutivo foram aplicados para obter resultados, por meio de programação computacional, usando Dinâmica de Fluido Computacional através do método de volumes finitos. As seguintes variáveis como temperatura de reação constante e variável, reator tubular sem e com deflectores, temperatura de alimentação, diâmetro de reator, processo adiabático e exotérmico, calor de reação constante e velocidade axial completamente desenvolvida foram investigados. Os efeitos de conversão de monômero, área transversal interna, temperatura axial, concentração do polímero, radicais e iniciador, outros corno densidade de polímero e monômero, perda de carga e queda de pressão foram determinados e simulados. Os produtos foram caracterizados com Número de Partículas (nucleação homogênea e heterogênea), distribuição de peso molecular, tamanho de partículas de polímero e distribuição de viscosidade. Estes resultados foram validados com resultados da literatura sob condição igualou aproximada. Os resultados sob condições não isotérmicas foram melhores que os resultados isotérmicos em termos de caracterização do polímero. Isso mostra que o desenho alternativo proposto (com deflectores) permite obter o polímero com propriedades melhores em termos de número de partículas, distribuição de peso molecular, distribuição do tamanho de partículas e viscosidade
Abstract: Deterministic model and emulsion homopolymerization process of styrene are applied in continuous tubular reactor without and with internal angular baffles under isothermic and no isothermic conditions. The modeling and simulation results were approximate to steady state, one-dimensional model, cylindrical coordinate, fully developed laminar plug flow, Smith-Ewart model to estimate the monomer conversion, Arrhenius chemical kinetics as laminar finite-rate model to compute chemical source. The objective is to model, simulate and to analyze the emulsion homopolymerization reactor performance of styrene with internal-inc1ined angular baffles, and to compare with continuous tubular reactor. The experimental and mathematical-deductive methods were applied to obtain results, by means of computational programming, using Computational Fluid Dynamics (program code), finite volume method. The following variables such as constant and variable reaction temperature, tubular reactor without and with baffles, feed temperature, reactor diameter, adiabatic and exothermic process, constant reaction heat and fully developed axial velocity were investigated. The monomer conversion, internal transversal are a, axial temperature, concentration of polymer, radicals and initiator, others as density of polymer and monomer, head loss and pressure drop effects were determined and simulated. The products were characterized by partic1es number (homogeneous and heterogeneous nuc1eation), molecular weight distribution, polymer partic1es size and polymer viscosity distribution. These results were validated with literature results under same or approximate condition. The results under no isothermic conditions were better than isothermic results in terms of polymer characterization. It is shown that the proposed alternative design (with baffles) allow to obtain the polymer with better properties in terms of number of partic1es, molecular weight distribution, particle size distribution and viscosity
Doutorado
Desenvolvimento de Processos Químicos
Mestre em Engenharia Química
Книги з теми "UNIX FORTRAN (Computer program language)"
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Loukides, Michael Kosta. UNIX for FORTRAN programmers. Sebastopol, CA: O'Reilly, 1990.
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Herbst, Robert Taylor. Software design using FORTRAN 77. Englewood Cliffs, N.J: Prentice Hall, 1990.
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Institute Of Electrical and Electronics Engineers. IEEE standard for information technology: POSIX FORTRAN 77 language interfaces -- Part 1: Binding for system application program interface (API). New York, NY, USA: Institute of Electrical and Electronics Engineers, 1992.
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Koffman, Elliot B. Fortran. 5th ed. Reading, Mass: Addison-Wesley, 1992.
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Koffman, Elliot B. Fortran. 5th ed. Reading, Mass: Addison-Wesley, 1993.
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Koffman, Elliot B. Fortran. 5th ed. Reading, Mass: Addison-Wesley Pub. Co., 1997.
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Monro, Donald M. FORTRAN 77. London: E. Arnold, 1985.
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Bezner, Hart C. Fortran 77. Englewood Cliffs, N.J: Prentice-Hall International, 1989.
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Gehrke, Wilhelm. Fortran 90 language guide. London: Springer, 1995.
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Kerrigan, Jim. From Fortran to C. Blue Ridge Summit, PA: Windcrest, 1991.
Знайти повний текст джерелаЧастини книг з теми "UNIX FORTRAN (Computer program language)"
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Parslow, Graham R. "Programming languages." In Microcomputers in Biochemistry, 29–62. Oxford University PressOxford, 1992. http://dx.doi.org/10.1093/oso/9780199632534.003.0002.
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Abstract The choice of a computer language is likely to be influenced greatly by what is on the shelf, what a consultant programmer recommends, or what the user is already familiar with. Any computer language is simply a shell hiding the fact that a computer can only understand machine instructions, which are a series of numbers passed to the central processing unit (CPU). The means at hand to write a program can always be adapted to one’s vision, and are effectively hidden from an end user regardless of programming subtlety or magnitude of labour. If FORTRAN or BASIC allows rapid execution of a task, then they are obvious choices. You cannot be intrinsically assured of speed advantages, high portability, or easily maintained code simply because a program is written in C. Programming itself is at risk of becoming an outmoded skill, like the task of making a ‘cat’s whisker’ rectifier for a primitive radio, because offthe-shelf software has filled many of the niches for which a user might choose to create a program. The ascendency of object-oriented programming even promises the end of programming as it is commonly understood.
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Fehr, Hans, and Fabian Kindermann. "Fortran 90: A simple programming language." In Introduction to Computational Economics Using Fortran. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198804390.003.0004.
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Before diving into the art of solving economic problems on a computer, we want to give a short introduction into the syntax and semantics of Fortran 90. As describing all features of the Fortran language would probably fill some hundred pages, we concentrate on the basic features that will be needed to follow the rest of this textbook. Nevertheless, there are various Fortran tutorials on the Internet that can be used as complementary literature. Fortran is pretty old; it is actually considered the first known higher programming language. Going back to a proposal made by John W. Backus, an IBM programmer, in 1953, the term Fortran is derived from The IBM Formula Translation System. Before the release of the first Fortran compiler in April 1957, people used to use assembly languages. The introduction of a higher programming language compiler tremendously reduced the number of code lines needed to write a program. Therefore, the first release of the Fortran programming language grew pretty fast in popularity. From 1957 on, several versions followed the initial Fortran version, namely FORTRAN II and FORTRAN III in 1958, and FORTRAN IV in 1961. In 1966, the American Standards Association (now known as the ANSI) approved a standardized American Standard Fortran. The programming language defined on this standard was called FORTRAN 66. Approving an updated standard in 1977, the ANSI paved the way for a new version of Fortran known as FORTRAN 77. This version became popular in computational economics during the late 80s and early 90s. More than 13 years later, the Fortran 90 standard was released by both the International Organization for Standardization (ISO) and ANSI consecutively. With Fortran 90, the fixed format standard was exchanged by a free format standard and, in addition, many new features like modules, recursive procedures, derived data types, and dynamic memory allocation made the language much more flexible. From Fortran 90 on, there has only been one major revision, in 2003, which introduced object oriented programming features into the Fortran language. However, as object-oriented programming will not be needed and Fortran 90 is by far the more popular language, we will focus on the 1990 version in this book.
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Nagarajan, Harikumar, B. Tamilarasan, and Thanjaivadivel M. "Building Blocks." In Advances in Systems Analysis, Software Engineering, and High Performance Computing, 32–66. IGI Global, 2024. http://dx.doi.org/10.4018/979-8-3693-3964-0.ch002.
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This work specifically examines the analysis of building blocks structures that experience finite displacements. The analysis was conducted with incremental sequential techniques. The Newton-Raphson iteration approach is used to load structural stages that have the ability to either soften or harden. A modified Newton-Raphson iteration technique is employed for loading stages in which the determinant of the global stiffness matrix is near 0 or negative, as observed in the snap-through scenario. The advanced computer language Fortran is used for structural analysis. To ensure the program's integrity, SAP (structural analysis program) is used for verification. The software is then used in several structural systems case studies. To accomplish this, the authors compare the axial stiffness of panels and jack elements as well as the height-to-span ratios of various structures. The structural responses were modelled using stiffening, snap-through, and softening load-displacement curves.
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Petersen, Wesley, and Peter Arbenz. "Applications." In Introduction to Parallel Computing. Oxford University Press, 2004. http://dx.doi.org/10.1093/oso/9780198515760.003.0007.
Повний текст джерелаАнотація:
Linear algebra is often the kernel of most numerical computations. It deals with vectors and matrices and simple operations like addition and multiplication on these objects. Vectors are one-dimensional arrays of say n real or complex numbers x0, x1, . . . , xn−1. We denote such a vector by x and think of it as a column vector, On a sequential computer, these numbers occupy n consecutive memory locations. This is also true, at least conceptually, on a shared memory multiprocessor computer. On distributed memory multicomputers, the primary issue is how to distribute vectors on the memory of the processors involved in the computation. Matrices are two-dimensional arrays of the form The n · m real (complex) matrix elements aij are stored in n · m (respectively 2 · n ·m if complex datatype is available) consecutive memory locations. This is achieved by either stacking the columns on top of each other or by appending row after row. The former is called column-major, the latter row-major order. The actual procedure depends on the programming language. In Fortran, matrices are stored in column-major order, in C in row-major order. There is no principal difference, but for writing efficient programs one has to respect how matrices are laid out. To be consistent with the libraries that we will use that are mostly written in Fortran, we will explicitly program in column-major order. Thus, the matrix element aij of the m×n matrix A is located i+j · m memory locations after a00. Therefore, in our C codes we will write a[i+j*m]. Notice that there is no such simple procedure for determining the memory location of an element of a sparse matrix. In Section 2.3, we outline data descriptors to handle sparse matrices. In this and later chapters we deal with one of the simplest operations one wants to do with vectors and matrices: the so-called saxpy operation (2.3). In Tables 2.1 and 2.2 are listed some of the acronyms and conventions for the basic linear algebra subprograms discussed in this book.
Тези доповідей конференцій з теми "UNIX FORTRAN (Computer program language)"
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Greynolds, Alan W. "Squeezing large fortran programs into personal computers." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1986. http://dx.doi.org/10.1364/oam.1986.fm2.
Повний текст джерелаАнотація:
Even though it is one of the oldest programming languages around, fortran is still the language of choice in much of the scientific community. In fact, its popularity has increased with the recent availability of first class compilers and fast floating point support for personal computers. By sticking closely to the fortran-77 standard and making use of a device-independent graphics protocol, it is relatively easy to write sophisticated programs that can be executed on anything from large supercomputers to desk-top microcomputers. However, when dealing with large programs (>10,000 lines of code) with large data arrays (greater than a megabyte), limitations in personal computer hardware and software need to be addressed. A new optical analysis program of this size is currently running, with almost no modification in source code, on not only DEC VAX minicomputers but also personal computers based on both the Intel and Motorola microprocessors.
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Thompson, Sean, and Harry H. Cheng. "Computer-Aided Displacement Analysis of Spatial Mechanisms." In ASME 1994 Design Technical Conferences collocated with the ASME 1994 International Computers in Engineering Conference and Exhibition and the ASME 1994 8th Annual Database Symposium. American Society of Mechanical Engineers, 1994. http://dx.doi.org/10.1115/detc1994-0052.
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Abstract Recently, Cheng (1993) introduced the CH programming language. CH is designed to be a superset of ANSI C with all programming features of FORTRAN. Many programming features in CH are specifically designed and implemented for design automation. Handling dual number as a basic built-in data type in the language is one example. Formulas with dual numbers can be translated into CH programming statements as easily as formulas with real and complex numbers. In this paper we will show that both formulation and programming with dual numbers are remarkably simple for analysis of complicated spatial mechanisms within the programming paradigm of CH. With computational capabilities for dual formulas in mind, formulas for analysis of spatial mechanisms are derived differently from those intended for implementation in computer programming languages without dual data type. We will demonstrate some formulation and programming techniques in the programming paradigm of CH through a displacement analysis of the RCRCR five-link spatial mechanism. A CH program that can obtain both numerical and graphical results for complete displacement analysis of the RCRCR mechanism will be presented.
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Johannesson, H. L. "Parametric Computer Aided Hydraulic Cylinder Design: Piston Component Modeling." In ASME 1989 Design Technical Conferences. American Society of Mechanical Engineers, 1989. http://dx.doi.org/10.1115/detc1989-0046.
Повний текст джерелаАнотація:
Abstract In this work a procedure for parametric computer aided design of hydraulic cylinder pistons has been developed. Such a piston is a kind of component that has a geometry that is dependent and determined of surrounding and interacting parts. The piston seal has a very strong influence on the piston geometry, and the kind of piston design rules that can be found in piston seal catalogues have been used in the developed computer programs. The design procedure is divided in two parts. In the piston family design part, a piston family product model, which is common for a group of pistons with different dimensions but uses the same seal cross section, is created and stored in a piston family product model data base. In the member design part the piston family data is retrieved, dimension determining parameters are given, and one particular piston of a certain size is created and presented. The software system needed in order to be able to apply the suggested procedure consists of - a CAD-system, containing a graphic application program language - a specific CAD-system dependent interface program written in the graphic application program language - two CAD-system independent interface programs written in a common high level language lite FORTRAN - CAD-system independent product model data bases All these programs except the CAD-system have been developed in this work, and the use of the programs is demonstrated with an example.
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Johannesson, H. L. "System Independent Product Models in Computer Aided Elastomeric Compact Seal Design." In ASME 1988 Design Technology Conferences. American Society of Mechanical Engineers, 1988. http://dx.doi.org/10.1115/detc1988-0003.
Повний текст джерелаАнотація:
Abstract In this work the problem of designing a CAD-system independent product model data base, to be used in computer aided elastomeric seal design, is treated. It is shown how a general purpose turn-key CAD-system can be used together with an external product model data base and external calculation programs. The importance of storing product information in a CAD-system independent data base instead of on drawings in one particular CAD-system is pointed out. This is of special interest from long time storage point of view, as product related information is expected to live longer in a manufacturing company than one particular CAD-system. In order to be able to transmit data between the CAD-system and the external product model data base, and between the data base and the external calculation programs, special interfaces must be designed. Here it is demonstrated how such interface programs can be designed using FORTRAN 77 and a particular graphic application program language available in the CAD-system CDM 300. For the creation of the data base and for the data storage and data retrieval, the data base management system TORNADO is used. Finally the simultaneous use of the CAD-system, the external data base and the calculation program, when designing an elastomeric seal cross section, is demonstrated with a test example.
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Naya, Miguel A., and Javier Cuadrado. "A Robust Tool for Tuning and Evaluation of Automobile Motion Controllers." In ASME 2005 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/detc2005-84668.
Повний текст джерелаАнотація:
During the last years, our group has worked on real-time formulations for the dynamics of multi-body systems. Now, in order to find out whether such methods are suitable to address real industrial problems, we intend to develop control algorithms for a car on its computer model (virtual prototyping), and evaluate the performance of such controllers when implemented on the corresponding physical prototype. This paper addresses the first part of the work. Two maneuvers are to be considered: straight line and obstacle avoidance. The computer model of the car has been coded in Fortran language. Fuzzy logic has been chosen to design the control algorithms, which have been implemented on the Matlab environment. Several alternatives to connect Fortran and Matlab-based functions have been studied, concluding that the most appropriate election depends on the purpose being pursued: controller tuning or onboard use of an already tuned controller. Simulator capabilities have been given to the program by means of a realistic graphical output and game-type driving peripherals (steering wheel and pedals), so that comparison may be established between human and designed automatic control.
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To, Cho W. S., and Lingchuan Li. "Exact Reduction by Group Theoretic Approach in Computational Nonlinear Structural Dynamics." In ASME 1997 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/detc97/cie-4447.
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Abstract The reduction method based on symmetry group or the so-called group theoretic approach (GTA) of Healey and associates for bifurcation analysis and free vibration analysis of geometrically nonlinear systems with symmetries is applied in the investigation reported here to the computations of responses of geometrically nonlinear systems under intensive transient excitations. A digital computer program written in Fortran language has also been developed for the work. Two space trusses discretized by the finite element method are chosen to illustrate the use of the GTA for cases undergoing large deflections. In the response computations for both the full space and reduced space or subspace problems the central difference method is employed. Numerical results are obtained. Comparisons of results for full space problems to subspace problems are made. It is concluded that the GTA is mathematically very elegant and rigorous. Computationally, the solution is exact and it is very efficient for geometrically nonlinear systems undergoing large deformation. The GTA is currently being developed for the response analysis of geometrically nonlinear systems with partial symmetries.