Brief Introduction to Shanghai Municipal Computer Applications Capability Examinations

At present,the world Hi-tech hasbecoming the locomotive of the econom-ic development.In Hi-tech,computerinformation technology has taken up afore running position.Meanwhile,com-puters technology goes deep into manyareas such as economy,finance,trade,business,culture life and family life. Thus,the popularity of computer ap-plications technology becomes charac-terizing the important feature of thesocial development.And mastering com-puter technology also becomes a nece-ssary basis of individual,work and life.

Computer applications for selecting operating parameters of stationary grain crop thresher

In this study,various operating parameters influencing performance of stationary grain crop threshers were established.These parameters were deduced from the established analytical models describing the underlying principles for the crop characteristics and machine variables as factors influencing the overall machine performance of a stationary multi-crop thresher.A computer programme written in Visual Basic was used to select optimum operating performance of the threshing process in a stationary tooth–peg grain crop thresher.An IITA-popularized stationary multi-crop thresher was used to test the practical feasibility of the computer based output of the threshing process.A split–split–unit statistical design was used for data collection.The data collected were analyzed using the GENSTAT 5 statistical package with its computer programme.The results showed that graphs of data from measured thresher performance indices against the predicted data for all the established models indicated high correlation between the models and the measured data at p≤5%significance level.The minimum energy requirements for detachment of sorghum and rice were observed at the threshing cylinder speed of 500 r/min(10.5 m/s)and 615 r/min(13.0 m/s),respectively.The combination of the threshing cylinder speed of 500 r/min(10.5 m/s)and 615 r/min(13.0 m/s)at crop moisture content of 12.8%and 16.2%indicated optimum threshing conditions for sorghum and rice,respectively.

Reduction Process of Blue Tungsten Oxide and its Microcomputer Process Control

Grain size control of tungsten powder is essential for high quality tungsten products. Based on studies on the hydrogen reduction process of tungsten oxide, a microcomputer system is described for reduction process control. The system, now running in Zhuzhou Tungsten and Molybdenum Materials Plant, controls the temperature of the reduction furnace and hydrogen pressure. It also controls a mechanical pusher which pushs the boats charged with blue tungsten oxide into the furnace tubes. Some of the technical problems in the process are analysed.

APPLICATION OF GRATING DIFFRACTION IN STRAIN MEASUREMENT

In this paper a new technique for measuring strain is presented. Using grating as the strain sensor, we can obtain strain and stress components by measuring the deformation of the space position of diffraction spots. The cost of the holographic grating by embossing is much reduced. By using the video and computer techniques the strain and stress values can be obtained automatically.

NUMERICAL FLOW VISUALIZATION OF A MIXING LAYER

Kelvin-Helmhotz roll up of the 3-D time-developing mixing was simulated numerically. The dye lines or fluid interfaces were presented by computing a passive scalar at high Peclet number. The hydric bubbles were also simulated numerically. To help understanding the visualization results, the behaviour of coherent structures were analyzed. A comparison between vortical structure and passive scalar contours indicates that the wrapping by the vortices largely dominates the evolution of passive scalar.

Evaluation of Metal Fatigue Problems Using Qualitative Reasoning Approach

Fatigue failures are often encountered in steel structures under heavy cyclic loadings. This paper presents metal fatigue problems in structural engineering using outcomes of recent advancements in numerical qualitative reasoning. Qualitative reasoning provides an effective and sound technique for solving complex and uncertain scenarios, regardless of the uncertainty or linearity of the design parameters and their constraints. This paper introduces the algorithms behind a software platform, built upon numerical qualitative reasoning for engineering applications. The software expresses the results of the analysis in variable ranges and diagrams showing a two-dimensional design space. The capability of representing design parameters and outcomes in solution spaces provides a practical way for engineers to leverage their existing knowledge and experience. Case studies in metal fatigue design are given to reflect on the capability of qualitative reasoning in engineering applications.