A program for longitudinal load analysis of electric transmission lines

An analysis procedure and computer program are described for the static analysis of electric transmission lines for unbalanced longitudinal loads due to broken wires or differential ice. The nonlinearily of the wires and suspension insulators are considered. A modified Newton-Raphson iteration procedure is used. The input to the program consists of: the physical properties of the transmission line; the ice loading and the location of broken wires. The output consists of the wire tensions and the displacements in the final equilibrium position. The program was developed under a research project funded by the Electric Power Research Institute.     

A nonlinear,semi-analytical finite element analysis for nearly axisymmetric solids

The presented research is concerned with the development of the theory and accompanying computer program for a semi-analytical finite element analysis of non axisymmetrically loaded, nearly axisymmetric solids. The theoretical basis of the method together with numerical procedures for handling boundary conditions, rigid body motion and the iterative solution process are described. A finite element program for evaluating the analysis is discussed, evaluated for effectiveness and applied to several examples.The range of application of the analysis for inhomogeneous, orthotropic, nonlinear and nearly axisymmetric bodies is demonstrated by a series of examples. The substantial savings in computer time and memory as compared to a conventional finite element analysis is discussed.     

Moltw: A program for conformational studies using empirical functions—I. Description and general evaluation

A Fortran V (Univac) program is described which calculates molecular conformational energies on the basis of user-selected intramolecular potential energy functions. The algorithm presented here is designed to perform the computation of the conformational partition and therefore it can be used for the prediction of experimentally available quantities such as NMR chemical shifts and coupling constants. The program is efficient in the sense that only dihedral angles and pseudorotational coordinates are handled in the first steps thus allowing a rapid sampling of a great number of points through the entire conformational space. The program provides options to choose between grid searches, energy minimization or both, using a reasonable amount of computer time.     

Hierarchical multi-level computer network for laboratory automation

The design and implementation of a microcomputer network to support laboratory automation is described and discussed. It is a multi-level hierarchical star network connected to a multiprogrammed computer on which all program development is done. The system is capable of supporting a large number of experimental setups. The microcomputers are either used as (1) local microcomputers for experiment control, (2) multiplexers for other microcomputers or (3) controllers for peripherals known in the multiprogrammed computer. The system combines the advantages of a large multiprogrammed computer with those of a small cheap dedicated computer close to the experiment. Character-oriented peripherals are connected to the multiprogrammed computer only. This reduces the amount of system software to be written for the network by an order of magnitude and eliminates the need for interfacing to existing small computer software. The system software consist of three small programs (monitors) providing a process concept and multibuffering of data in the involved computers. The monitor establishes a hierarchy of control and they eliminate the need for any local load device for the microcomputers as their monitors are in a read-only store. The system developed is designed for control of experiments in an environment where the experiments and the control strategies change with time and where the data refinement required is beyond what can be done on the present generation of microcomputers.     

A computer monitored chemical reaction

The instrumental set-up as well as the program structure is presented for a solution phase chemical reaction in process control. Educational applications are outlined for its use within a physical chemistry laboratory course. By means of this experiment students are introduced and acquainted with computerized instrumentations, data acquisition, data reduction, and process control.     

Complementary error bounds for foolproof finite element mesh generation

The use of complementary variational principles in finite element analysis is examined. It is shown that complementary finite element solutions provide an element by element measure of the accuracy of the solution. By solving a problem repeatedly, beginning with a coarse mesh and refining those elements having the largest errors, an automatic, foolproof finite element mesh generation procedure is developed. Finite element solutions obtained by the new procedure have the property that the finest elements are concentrated in regions of greatest need while large elements are found in less important regions. A computer program which implements the new algorithm is described and examples of finite element solutions generated by the program are presented.     

计算机辅助气相色谱分析方法建立

描述了计算机辅助气相色谱分析方法的建立，已设计的软件不但可对样品能否使用气相色谱法进行判断，对气相色谱柱系统进行推荐，而且可进一步给出最佳的温度程序。用空气中毒物烃／卤代烃样品进行实验，预测结果与实验结果能很好吻合，保留时间误差在３％以内。     

Computerized system for a nutritional support service

The development of a computerized system for the assistance of a nutritional support service (NSS) is described. A cooperative program exists between the NSS and the Department of Laboratory Medicine, whose computer system is used to support the activities of the NSS. A record is maintained on each patient followed by the NSS (15-20 patients per day). Demographic and anthropometric data, nutritional disorder(s), laboratory data, nutritional support therapy, patient response criteria, and concomitant drug therapy are components of the computer program. Computer reports are provided to the NSS for daily rounds. An automated nutritional assessment program has also been developed. Computer assistance has proven to be a valuable tool to support the patient care, education and research program of the NSS.     

Solution of large eigenproblems on a microcomputer

A microcomputer program is presented for determining the lowest eigenfrequencies of large structural systems by using the finite element method. The solution procedure is based upon the subspace iteration technique. Householder's tridiagonalisation and the QL method are used in order to solve the eigenproblem in the reduced space at each iteration. The computer code has been implemented in BASIC and its present version is suitable for the solution of eigensystems with 1000–2000 degrees of freedom. The features of the program are pointed out and numerical tests are presented. It is shown that very accurate results can be obtained, although the computer system we have used sets a few constraints which often imply very long computing times (particularly when large bandwidth systems are given).     

A curve analyzer for micro-computers

A computer program is described that emulates a curve analyzer and fits a sum of up to 30 Gaussian components plus a straight background to any set of equi-spaced data points. The program allows interactive, real time curve fitting by the operator and/or objective curve fitting using a non-linear least squares fitting routine, or a combination of the two. The program is more robust in a micro-computer environment than subtractive or generalized non-linear least squares methods and faster than pattern searching methods. The program has been used over the last 4 years in my laboratory by a number of personnel without any previous experience of computers. It is written in BASIC and runs on a Hawlett-Packard series 200 model 16S (9816) computer or on a Hewlett-Packard model 9845S computer. The program is structured to allow use of any underlying curve shape with 3 parameters per component.     

Elastic - plastic design of unbraced frameworks

A computer program for the optimum elastic-plastic design of two-dimensional steel frameworks is described, and design examples are presented. These examples are used as a basis for comment on some of the assumptions adopted in the program. The paper also compares and contrasts the philosophy used in the program with other approaches reported in the literature.     

Prediction of deflection of reinforced concrete shear walls

Reinforced concrete shear walls are used in tall buildings for efficiently resisting lateral loads. Due to the low tensile strength of concrete, reinforced concrete shear walls tend to behave in a nonlinear manner with a significant reduction in stiffness, even under service loads. To accurately assess the lateral deflection of shear walls, the prediction of flexural and shear stiffness of these members after cracking becomes important. In the present study, an iterative analytical procedure which considers the cracking in the reinforced concrete shear walls has been presented. The effect of concrete cracking on the stiffness and deflection of shear walls have also been investigated by the developed computer program based on the iterative procedure. In the program, the variation of the flexural stiffness of a cracked member has been evaluated by ACI and probability-based effective stiffness model. In the analysis, shear deformation which can be large and significant after development of cracks is also taken into account and the variation of shear stiffness in the cracked regions of members has been considered by using effective shear stiffness model available in the literature. Verification of the proposed procedure has been confirmed from series of reinforced concrete shear wall tests available in the literature. Comparison between the analytical and experimental results shows that the proposed analytical procedure can provide an accurate and efficient prediction of both the deflection and flexural stiffness reduction of shear walls with different height to width ratio and vertical load. The results of the analytical procedure also indicate that the percentage of shear deflection in the total deflection increases with decreasing height to width ratio of the shear wall.     

Run-time diagnostics in pascal

A compiler maps abstract data and control structures into equivalent representations at the order code level of a computer. When a program written in a high level language fails, there is presented the problem of interpreting the state of the abstract (high level) machine in terms of the state of the physical machine which is all that is available. This interpretation is undertaken by a program usually known as a run-time diagnostics package. In this paper a novel package is described which provides diagnostics for dynamically created data structures in addition to the usual facilities. It has been implemented for the language Pascal and has been used successfully for 18 months.     

DIFFREALWAVE: A parallel real wavepacket code for the quantum mechanical calculation of reactive state-to-state differential cross sections in atom plus diatom collisions

A parallel computer code for the calculation of quantum state-to-state atom-diatom differential reactive cross sections is presented and discussed. The code is based on the real wavepacket approach. The theory underlying the code is discussed and the parallelisation methods used are described. All the input parameters needed by the program are described. Results of test calculations to investigate the scaling properties of the code with grid size and number of processors are presented.     

A computer-aided selection procedure for rolling element bearings

A computer-aided selection procedure for rolling element bearings is described and its use illustrated by examples of computer printout. The programs are written in the interactive Focal language for use on a PDP-8 computer. To avoid the need for extensive computer storage of bearing data, certain data for the bearing under test have to be entered during each program run.     

基于能量演化的航空发动机突发性故障预示模型设计

为减少突发性故障的发生及其对航空发动机的危害,提出了一种用于突发性故障预示的方法,提取系统能量特征,对其运行状态趋势进行预示。建立了突发性故障预示模型,应用能量耗散结构理论对该模型的演化过程与规律进行了描述。利用空停仿真数据对该模型进行了验证,结果表明,该模型具有较好的故障预示能力。     

Broken wire analysis of transmission line systems

A general procedure is presented for computing the dynamic response of electric transmission line systems when one or more wires suddenly break. A computer program for performing a time history analysis for the nonlinear system has been developed. The program will compute the wire tensions, the arm loads and the ground line moments at the base of the support structures. A comparison is made between the computed results and the experimental results for a small scale laboratory model. Analysis of a full scale transmission line system shows that the impact factor as high as 4.5 can be expected due to the dynamic effects.     

电导法测定乙酸解离常数实验数据处理软件设计

介绍了用电导法测定乙酸解离常数的实验原理和步骤,给出了用计算机对电导法测定乙酸解离常数的实验数据进行处理的软件设计方法,同时给出了用Visual FoxPro 6.0编写电导法测定乙酸解离常数的处理软件的基本结构和部分程序代码。     

The cray-1s and the cray service provided by the serc at the daresbury laboratory

The position of the CRAY-1S within the computing facilities provided by the SERC will be presented and its relationship to the front end machine at DL and the SERC network discussed. The physical characteristics of a CRAY Computer are then described followed by a list of the design features that contribute to the high speed of these machines.The second area which will be discussed is the type of scientific work currently being carried out on the CRAY. The general principles involved in the selection of research work suitable for implementation on the CRAY will be presented together with a list of all the different areas of scientific calculations currently pursued. The performance of the CRAY relative to other computer systems is also given for several of the applications.The accessibility of the CRAY-1S will be described together with the facilities available for job input/output and dataset transfer. The available program packages will be listed and their range of applications described. The nature of the algorithms used for job scheduling will be presented together with some statistics on the characteristics of jobs run on the machine.     

软件安装自动化

描述了通过改造安装程序,在setup.exe文件末尾追加消息发送代码,使程序在运行后启动单独的消息发送线程,按照用户事先指定的消息发送顺序依次完成安装过程,使安装实现自动化,该技术可在机房维护中推广使用.