AGC2075＋图形板在激光／声探潜中的应用

本文简要介绍了ＡＧＣ２０７５＋图形板的结构和性能特点，着重叙述了如何应用图形处理板中ＴＩＧＡ软件接口进行图形显示的软件设计。     

分析应力的256等级色矢量显示及其动画实现

本文提出了在计算机ＴＶＧＡ的２５６色图形显示模式下，运用矢量线和等级色彩实现应力的矢量方向数值大小全部信息的直观显示的方法，叙述了此种方法的实现过程，并在此基础上实现了应力变化的动态显示。     

裁剪曲面的三角化及图形显示

结合自主版权的超人ＣＡＤ／ＣＡＭ系统的开发，本文提出了一种适合于裁剪曲面图形显示的曲面三角化算法，该算法将曲面的三角化转化为曲面参数域的三角化，并将二维图形的集合运算与Ｄｅｌａｕｎａｙ三角剖分应有和于曲面参数域边界的处理，从而使裁剪曲面在边界上的三角形分布均匀。     

用Intel82786构成的声呐显示系统的软件设计

简要介绍了Intel 82786图形控制器的结构、功能和特点,着重给出了它在声呐显示应用中的软件设计.     

利用ObjectARX2000显示打开的图形数据库

论述了基于AutoCAD2000环境下用ObjectARX2000开发工具显示图形数据库文件的方法，介绍了ObjectARX2000深层克隆功能（deep-clone），给出了完整的程序结构和伪代码，该方法突破了ObjectARX2000不能调用AutoCAD2000中“打开”（Open）命令的限制，为已读入的图形数据的显示提供一种可行方法。     

参数化图形设计技术及其在组合式空调CAD中的应用

本文论述了一个组合式空调ＣＡＤ系统，文中着重阐述了参数化图形设计原理及其在组合式空调ＣＡＤ中的应用，利用此种方法建立及修改图形方便有效。     

图形保存与重用绘制技术研究及应用

分析了AutoCAD本身提供的图形实体保存与绘制技术存在的不足,提出基于ObjectARX MFC与Access数据交互技术的图形实体保存与绘制新方式,图形实体数据保存到独立于AutoCAD图形库的Access数据库中,实现了复杂图形实体的永久性保存和跨工程图文件的使用,应用于模具设计等案例重用过程中,效率显著提高     

Transputer B419图形板及其在声呐显示中的应用

介绍了Transputer B419图形板及其在拖曳线列阵声呐显示中的应用,并用进程观点阐述了图文显示的并行语言程序设计。     

一种高分辨率图形桌面技术

介绍一种基于主从控制模式及多计算机并行显示的高分辨率图形桌面技术,实现分辨率更高、图像刷新率更快的图形桌面的生成、传输和多计算机并行显示.通过对单台计算机图形桌面技术的改进克服现有技术受限于单台计算机性能的状况,能够提升图形桌面的性能,将极大程度的提高高分辨率计算机图形桌面的应用范围.     

二维光纤位移传感器的数据采集,处理和图形显示

根据 256×256 光纤位移传感器的工作原理和数字编码技术建立了位移测量和处理的数学模型;并在光斑直径小于5毫米的情况下,提出了光斑同时照射几根光纤的处理办法。概述了以 8098 微控制器为主体的数据采集处理装置;从测试系统的可靠性、可维护性和可扩展性出发,重点论述了该设计中的自诊断技术、通用性设计、软件陷井等。为了在小型测控系统中显示图形和字符等,采用了点阵 LCD 显示器;文中概述了它的硬件控制原理、程序总体结构和模块,通过它在二维光纤位移传感器中应用实例阐明其作为小型测控系统“人机界面”的广泛应用前景。     

平板型复合材料格栅结构载荷重构研究 Ⅱ: 反演模型与验证

将最优化方法应用到复合材料格栅板的载荷重构中,基于文献[11]所建立的前向响应模型,通过构造误差性能指标J表征前向响应模型与实测响应的差,将载荷的反演转换为所定义误差性能指标极值条件的获取,应用平滑算法对指标J的极值进行了求解;并借助分布式响应的功率梯度云和指标J极值点的搜索给出了一套由粗到精的载荷定位方法,实现了AGS板的载荷时程和载荷位置的同时重构。算例与实验研究表明,本文方法具有较高的反演精度和鲁棒性,从而为AGS的工程应用提供了必要的技术储备。      

反应堆含氚重水提氚关键技术研究进展

基于建立的年处理１０t重水的组合电解催化交换唱色谱分离（CECE-GC）实验系统,就含氘轻水提氘 演示实验及利用含氚轻水进行含氚重水提氚模拟运行做了介绍。结果表明,２４０h含氚轻水的连续运行,CECE 系统整体浓缩倍数约为４,电解池氕、氚分离因子约为１０;８m３桙d色谱分离系统运行２３h,可将１０.５m３料气的 ９０％中的氘贫化１０００倍;氚储存系统运转正常。CECE唱GC实验系统的建立,为重水提氚技术的进一步工程化提 供了研究平台。     

Methods for direct-reading noise measurements of low-gain two-ports

This paper describes direct-reading measurement methods of noise figure F_m displayed by an automatic noise figure indicator. The F_m readings should be equal to F_x, which are the true noise figure values of the two-port under test, regardless of its available power gain G_Ax, and the noise figure of the measurement receiver F_t. Technical problems of these F_x direct readings are shown. They particularly occur while using the conventional measurement methods. Methods that allow elimination of the influence of the F_r value on F_m readings as well as the influence of both F_r and G_ax on F_m are discussed. An important advantage of using the method with elimination of the F_r value is presented. Formulas are given which allow the estimation of the technical requirements for additional blocks of measurement systems or to count measurement error components, specific for the chosen measurement method     

A Technique for Differential Noise Figure Measurement of Differential LNAs

This paper presents an approach to measure the noise figure of a differential low-noise amplifier (LNA) based on familiar ldquocold-hotrdquo single-ended noise figure measurements. To demonstrate the usefulness of this approach, measurement results are presented for a wideband differential LNA designed to be used as the first stage of the receiver in the Square Kilometre Array radio telescope. The presented LNA achieves less than 0.41 dB of differential noise figure in the 700 MHz to 1.4 GHz band, differential S₁₁ <-13 dB, differential S₂₁ between 18 and 14 dB, single-ended output P1 dB of -8.2 dBm, and output IP3 of -1 dBm while consuming 81 mA from a 1.3-V supply. The approach of measuring the differential noise figure may be automated with one switch at the output of a standard noise source and one switch at the input to a standard noise figure analyzer or a noise figure meter, allowing for automated noise figure measurements of differential LNAs based on the differential pair topology.     

Vacuum-Aided Recovery Technology of Spent Ni-Cd Batteries

Recovery of Ni-Cd batteries was studied by a self-designed vacuum-aided recovering system under laboratory conditions.The fundamental research on a process of disassembling and recovering selected materials from Ni-Cd batteries was conducted ,The impacts of temperature,pressure and time were studied respectively ,The mechanism of vacuum thermal recovering was laso discussed,The results show that:Ni-Cd batteries can be recovered effectively by vacuum-aided recovering system at 573-1173K.At constant pressure,the increase of temperature can improve the separating efficiency of cadmium ,When the temperature is 1173K, the cadmium can evaporate completely from the residue during 3 h at 10 Pa ,The reduction of pressure in the certain range is effective to separate cadmium by vacuum distillation .Distillation time is a very important factor affecting separation of cadmium.     

Note on the Thermal Degradation of Polytetrafluoroethylene as a First-Order Reaction

Additional experiments on the rates of thermal degradation of polytetrafluoroethylene in a vacuum confirm an earlier conclusion that a first-order rate law is involved in the degradation reaction.In a study made by Madorsky, Hart, Straus, and Sedlak¹ on the rates and activation energy of thermal degradation of polytetrafluoroethylene in a vacuum, two methods were employed: a gravimetric method, using a very sensitive tungsten spring balance in a vacuum system to measure the rate of loss of weight of the degrading sample, and a pressure method, using a multiplying manometer to measure the pressure of the C₂F₄ formed in the reaction. The material that was used was in the form of a tape 0.07 mm thick. Weight of the sample was about 7 mg in the gravimetric experiments and 5 to 306 mg in the pressure experiments.The rates obtained by the gravimetric method are reproduced in figure 1, plotted as a function of percentage loss of weight of the sample for 480, 490, 500, and 510 °C. The initial rates were obtained by extrapolating the rate curves to the ordinate. The rate curves beyond the initial 5 to 18 percent loss of weight of the sample are straight lines, and when extended to the right they approach near the zero rate at 100 percent volatilization. The rates obtained by the pressure method were studied at 10 different temperatures ranging from 423.5 to 513.0 °C. Logarithms of the initial rates obtained by both methods are shown in figure 2 plotted against the inverse of absolute temperature.² From the Arrhenius equation the slope of the resulting straight line indicates an activation energy of 80.5 kcal/mole. From the appearance of the curves in figure 1 it seemed logical to conclude that the reaction involved in the thermal degradation of polytetrafluoroethylene in a vacuum follows a first-order law.Open in a separate windowFigure 1Rate of thermal degradation of polytetrafluoroethylene by the weight method as a function of percentage volatilization.Open in a separate windowFigure 2Activation energy slope for thermal degradation of polytetrafluoroethylene.●—weight method (see footnote ¹)○—pressure method (see footnote ¹)■—present work.At a later date Wall and Michaelson³ studied the rate of thermal degradation of polytetrafluoroethylene at 460 °C in a stream of nitrogen. They used a gravimetric method by heating 1-g samples of a powdered material and weighing the residues at intervals. They state that below about 480 °C the reaction is zero order, whereas above 510 °C they concede it is first order.In view of this result by Wall and Michaelson, it was deemed advisable to check further on the rate order involved in the thermal degradation of this material in a vacuum. Although experiments by the pressure method were carried out in our earlier work at temperatures below 480 °C, the extent of volatilization was at most only 6.4 percent. Degradation had not been carried far enough to determine accurately whether the percentage loss versus time plots were straight or curved lines, i.e., whether the indicated reaction is of zero or first order. Rate experiments were therefore carried out by the weight method at lower temperatures, namely at 460, 475, and 485 °C, and the results are shown in figure 3, where percentage loss of weight is plotted against time. The curves are definitely not straight lines, as would have been the case if the reaction had followed a zero order.Open in a separate windowFigure 3Pyrolysis of polytetrafluoroethylene at low temperatures.In our previous work (see footnote ¹) the rates were obtained by plotting the slopes between two neighboring experimental points in the volatilization-time plots. In the present work the slopes were calculated from the curves shown in figure 3, and the resulting rate curves based on these calculations are shown in figure 4. The same type of rate curves were obtained as in the earlier work. Values obtained for the initial rates at these three temperatures fit nicely into the Arrhenius plot, as shown by the squares in figure 2.Open in a separate windowFigure 4Rates of thermal degradation of polytetraduoroethylene at low temperatures.The present work therefore confirms our earlier conclusion that the degradation of polytetrafluoroethylene in a vacuum follows a first-order rate law, where the rate of volatilization, based on the sample, is directly proportional to the amount of residue.     

我国伴生稀散金属锗镓的选矿回收研究概况

概述了稀散金属元素锗、镓的特点和我国选矿回收存在的问题,以及我国选矿回收锗、镓的主要企业的研究概况,指出了目前选矿过程存在的主要问题和下一步的重点研究方向。     

Conceptual design for a process to recover volatile solutes from aqueous solutions using silicalite

A novel method to recover dilute volatile solutes from aqueous solutions places pure silicalite powder in the annular space between two concentric porous pipes. Solute-rich fluid flows through the silicalite bed. When the bed is fully loaded, it is regenerated by passing steam through heat exchange tubes that are in intimate contact with the bed. In the case of ethanol, this system is able to produce 24wt% ethanol from a 1wt% solution in a single step. Because butanol is more nonpolar, the system is able to produce 50wt% butanol from a 1wt% solution in a single step. It is estimated that recovering 1% ethanol costs $0.0493/ L of 95% EtOH, whereas recovering 1% butanol costs $0.0277/L of pure BuOH. This cost is less than 4% of the selling price of butanol, which suggests this is a promising technique for product recovery in the acetone/butanol fermentation. This technology also has potential uses in removing volatile solutes from polluted water     

中国石油大连石化公司二催化装置能耗现状及分析

对中国石油大连石化公司二催化装置目前节能方面的现状进行阐述，找出了目前工况下存在的差距，并就烟气热量回收、油浆高品质能量的合理回收、装置废汽回收的利用等方面的节能措施进行了探讨分析。     

曲线拟合在图像恢复中的应用

讨论了曲线拟合在图像恢复中的应用．对图像的各行信息进行了曲线拟合,从而消除加性背景干扰．使用该方法能使图像恢复出较均匀的像面．通过该处理能较好地消除X射线图像中的加性背景干扰．