基于USB2.0的多路数据采集系统上位机软件设计

设计一个上位机软件实现对采集系统数据的传输、存储、分析、绘制曲线图等功能．配合硬件系统，该软件还具有设备复位、Flash坏块检测、Flash擦除等功能．上位机软件采用VB编写主控程序，在VB中调用Matlab绘制数据曲线．文中详细介绍了基于FT245BM的USB2．0与上位机的通信原理，VB与Matlab之间的数据传递机制等关键技术．该软件已成功地用于多种采集系统的数据传输和数据处理．实验表明：该软件执行效率高、数据分析和曲线绘制速度快，适用于通用的数据采集系统     

金属圆棒拉伸试样σP0.2值在WAW—Y500试验机上的简易测量法

论述了在ＷＡＷ－Ｙ５００试验机上通过绘制力－央头位移曲线来测量金属圆棒拉伸试样的规定比例伸长应力σＰ０．２值的方法及其可行性。通过分析得出,采用该方法在生产检验上测量金属圆棒拉试样的规定非比例长应力σＰ０．２,试样可采用的最短平行长度为５００ｍｍ。     

隧洞开挖爆破计算机辅助设计

以Visual Basic语言来实现隧洞开挖爆破计算机辅助设计,输入初始设计变量,得出设计结果和自动绘制炮孔布置图,代替了手工或简单用Auto CAD绘制,并且利用ACCESS来建立隧洞爆破实例数据库,以便查阅类似工程条件的爆破工程资料,实现工程类比法设计.     

虚拟现实中的基于图象的建模

文章介绍了虚拟现实中一种基于图象的建模方法 ,该方法使用了 Adlson和 Bergen提出的全景函数来实现基于图象的绘制原理 ;全景函数是从已知的一个空间点 ,绘制每一个可视事物的参数化函数 ;介绍一种新颖的圆柱面投影方法 ,来简化该建模方法     

计算机辅助金属制件展开

对一些大型金属制件的展开,可采用计算绘制法再加以计算机辅助来完成.文章略要介绍了炉壳和弯头展开的计算绘制原理和程序方框图,并给出二个应用实例.     

基于CATIA工程斜齿圆柱齿轮精确建模与失效有限元分析

以准确绘制齿廓渐开线和螺旋线为基础,通过多截面曲面绘制出齿型曲面并运用曲面缝合功能实现齿型闭合,最后结合技术细化处理,实现斜齿轮的精确建模．在此基础上,利用CATIA软件CAE功能并结合斜齿轮传动原理,对斜齿轮实际工况进行有限元分析,从而为工程失效分析提供精确的数据参考．     

用OWC组件绘制基于Web的油藏动态分析图件

在使用ASP或ASP.net进行Web开发中，经常需要将各种统计数据或数据库以函形的方式表达出来。如果是绘制简单的直线或柱状图可以采用画表格或缩放特定的GIF图象的高度和宽度来实现，但如果要绘制一些复杂的曲线就比较困难了。本文通过对OFFICE自带的OWC（Microsoft Office Web Compoent）控件的研究和认识实现了复杂曲线的绘制，并将这种方法绘制了鄯善油田常用的几类油藏动态分析图件。     

从彩绘和吴文化看惠山泥人的审美抽象

惠山泥人是江南地区传统的手工技艺之一,多以大红、淡绿、云青、金黄等颜色在泥人身上绘制而成。其色彩华丽璀璨,工艺大气精关,以独特的艺术形式充分反映了吴地人民的审美情趣和吴文化民族意识,．本文即试图从彩绘搭配及吴文化传承等角度来分析其抽象审美特征。     

微机在飞机噪声预测中的应用研究

本文论述了如何应用TEKTRNIX4051来绘制飞机噪声污染的等值曲线,并讨论了应用该方法来预测飞机噪声的污染,文中给出了实例验证。     

浅谈土地勘测定界图的绘制

运用CASS7．1和ArcGIS相结合的方法，绘制勘测定界图，大大提高了做图的速度与精度。     

The evaluation of two-dimensional carbon-carbon composite material by dynamic mechanical analysis

Carbon composite materials, consisting of carbon cloth densified with a carbon matrix, have been examined by dynamic mechanical analysis (DMA). Flat panel and conic section structures were investigated over the temperature range ambient to 500°C. Reproducibility of the calculated tensile storage modulus values has been shown to be within 5% at any one temperature over the entire temperature range. This technique, which has been demonstrated to be non-destructive of the sample analyzed, defines differences in mechanical properties of the composite material formed into a conic section by comparison with those of the same material formed into a flat panel. Minor heterogeneity has also been shown within a single conic section as well as differences between pitch and CVD matrix samples. A sample orientation effect was found with the conic section samples. Details of the experimental technique and assumptions made during calculation of the mechanical properties are discussed.     

Inclined toroidal surface that fits an off-axis conic section

We developed a formulation using the continuous least-squares method to determine the inclined toroidal surface that best fits a given off-axis conic section. A toroid with a known curvature is used to obtain an analytic equation for the angle of inclination of the axis with respect to the normal to the center of the off-axis section.     

Generation of on-axis and off-axis conic surfaces of revolution by applying a tubular tool

A new technique, fabrication of aspherical ultraprecise surfaces using a tube, is applied to the generation of conic surfaces of revolution, which also demonstrates that it is possible to generate different kinds of surfaces with the same tube. Surfaces are considered that are generated with the same tube with an elliptical edge but with different off-axis distances and different angles between the tube and the surface. Subsequently it is shown that the generated surface is always a radial section of a conic surface. In addition it is proven that the shape of the generated conic surface is independent of the off-axis distance. With each elliptical tube edge a range of different conic surfaces can be made depending on the angle between tube and surface. The more the tube edge resembles a circle, the larger will be the range of different surfaces. For each tube an angle between the tube and the surface exists at which it generates an on- or off-axis part of a semi-ellipsoid. Finally, an optimization technique is presented for the determination of the best combination of process-determining parameters for the generation of a certain conic surface.     

球面透射的进一步研究

在透射问题中，两内离二次曲面成透射的条件至今尚未研究，通常，该条件很难确定。笔者进一步研究了球面透射问题，得到了两内离球面的4种透射结构及其定量关系，从而为研究更一般的二次曲面内离情况下成透射的问题奠定了一定的理论基础。球面透射的研究结论，可用到相关的平面上的透射问题中。两一般二次曲线成内离和相交情况下，透射中心及透射参数如何确定的问题尚待研究。     

The effect of the structure of heterogeneous media on the evaporation of liquids under intensive thermal stimulation

Mass-transfer processes in heterogeneous media under intensive thermal stimulation are investigated. The structure of a capillary-porous material is simulated by rigid conic channels of convergent and divergent types. The viscous flow of vapor at temperatures above the boiling point of evaporating liquid is considered in a quasi-stationary approximation. Expressions for the rate of evaporation from axisymmetric capillaries of variable cross section are obtained in an analytical form. Results are given of estimation of the intensity of vaporization in channels of different types.     

Lava lamp optics

An interesting optical focusing effect occurred in the early heating phases of a simple model of a lava lamp that was constructed to demonstrate convection effects. During this early heating phase, the interface between the two immiscible liquids was found to form a surface of rotation with a conic cross section that acted as a mirror to produce an excellent image of the filament of the bulb within the lower liquid. The relevant features of the lamp construction are discussed briefly, and photographs of this focusing effect are shown. A simple analysis is presented that transforms the photographed cross section of the liquid interface into the true cross section by removing the effect of the cylindrical lens formed by the fluid-filled bottle, and the resulting cross section is then fitted to the shape of an ellipse. The possible cause for the shape of this liquid interface is discussed and compared and contrasted with the somewhat analogous situation of a stretched circular membrane that is subjected to different gas pressures on either side of the membrane.     

空间二次曲线射影重建计算方法研究

利用二次曲线上点和直线的对应以及利用二次曲线光流对二次曲线进行解释,需要寻求多元方程组的最优解,计算过程较为复杂。将空间二次曲线表示为一个空间二次曲面和一个平面的交线,提出了一对对应二次曲线存在两个独立的多项式条件;利用两个二次曲面的基曲线推导出二次曲线重建的两个对应条件,在此基础上,给出了空间二次曲线射影重建的计算方法和计算步骤。实验验证表明该算法实用和可靠。     

Magnification of conic mirror reflectometers

Conic mirror reflectometers are used to measure the diffuse reflectance and total integrated scatter of surfaces. In spite of the long history of using conic mirrors for these purposes, the maximum magnification of the three primary types of conic mirror (hemisphere, hemiellipsoid, and dual paraboloid) had not been compared quantitatively. To our knowledge, an exact magnification formula has not been published for any of the three primary conic mirrors. The maximum magnification is needed for proper sizing of detectors and radiation sources used with reflectometers. Exact analytical expressions for the maximum magnification of a Coblentz hemisphere, a hemiellipsoid, and a dual-paraboloid mirror system are derived and compared.     

Dimensionality reduction in conic section function neural network

This paper details how dimensionality can be reduced in conic section function neural networks (CSFNN). This is particularly important for hardware implementation of networks. One of the main problems to be solved when considering the hardware design is the high connectivity requirement. If the effect that each of the network inputs has on the network output after training a neural network is known, then some inputs can be removed from the network. Consequently, the dimensionality of the network, and hence, the connectivity and the training time can be reduced. Sensitivity analysis, which extracts the cause and effect relationship between the inputs and outputs of the network, has been proposed as a method to achieve this and is investigated for Iris plant, thyroid disease and ionosphere databases. Simulations demonstrate the validity of the method used.     

A semi-infinite-crack model for determining mode I stress intensity factors using crack surface displacements

A semi-infinite-crack model is used to supplement the conic section simulation method for determining stress intensity factors of finite cracked bodies under mode I loadings. The actual displaced crack surface profile is found by finite element analysis. For each crack surface segment between two neighbouring nodes, a set of model parameters is found by using the displacements of these two nodes. A stress intensity factor estimate is then calculated from the closed-form formula associated with the model. It is found that near-tip crack surface displacements produce model parameters that are sufficient for quantifying the stress intensity factor. The semi-infinite-crack model can be used either as a stand alone model or in conjunction with the ellipse simulation procedure to form a systematic approach. It is shown that this model can be applied to different geometries and loadings with excellent accuracy.