一种智能化高精度数控直流电源的设计与实现

本论文研究一种以单片机为核心的智能化高精度直流电源。该电源采用数字调节、闭环实时监控、输出精度高，且兼备双重过载保护及报警功能，特别适用于各种有较高精度要求的场合。利用单片机对直流稳压电源进行控制，改善了电源的性能，使用方便灵活，且成本较低，同时控制系统在软件上还可进一步改进，以扩展其功能，而并不需要增加硬件开销，从而提高电源的性能价格比。     

基于波动方程的共聚焦点成像技术

对于较复杂的理论模型和低信噪比的实际地震资料处理来说，用基于射线理论的有限差分走时法共聚焦点（CFP）成像技术生成的CFP偏移剖面不能精确地对地下构造成像。为此，探讨了基于波动方程的傅里叶有限差分法（FFD）共聚焦点（CFP）成像技术。该技术可以自动检测宏观速度场正确与否，大大提高了聚焦算子的计算精度和双聚型保幅成像精度。数值模拟验证了方法的正确性，实际资料处理验证了方法的有效性和实用性。与基于射线理论的有限差分走时法的CFP成像剖面对比结果表明，基于波动方程的CFP偏移剖面分辨率更高，层位更清楚，可以对地下构造清晰成像。     

纳米电子束曝光

JEOL JBX- 5 0 0 0 L S是矢量扫描的电子束曝光机 .系统采用 L a B6 灯丝 ,可以工作在 2 5 k V和 5 0 k V的加速电压下 .对该系统的分辨率、稳定性、场拼接和套刻精度进行了系列研究 ,得到了分辨率为 30 nm的图形 ,图形的套刻精度也优于 4 0 nm.     

装配尺寸链中概率修配和极值修配的新解法

简要介绍了产品结构设计、工艺设计及生产过程中，极值修配法和概率修配法的新解法。     

A comparative study of the reliability of nine statistical software packages

The reliabilities of nine software packages commonly used in performing statistical analysis are assessed and compared. The (American) National Institute of Standards and Technology (NIST) data sets are used to evaluate the performance of these software packages with regard to univariate summary statistics, one-way ANOVA, linear regression, and nonlinear regression. Previous research has examined various versions of these software packages using the NIST data sets, but typically with fewer software packages than used in this study. This study provides insight into a relative comparison of a wide variety of software packages including two free statistical software packages, basic and advanced statistical software packages, and the popular Excel package. Substantive improvements from previous software reliability assessments are noted. Plots of principal components of a measure of the correct number of significant digits reveal how these packages tend to cluster for ANOVA and nonlinear regression.     

天线系统数字引导精度分析

数字引导是一种重要的天线工作方式，广泛应用在卫星测控、遥测和遥感地面站天线系统中。本文论述及分析了天线系统数字引导的方法和引导精度。     

Method of Validating the Measurement Accuracy When Estimating Circular Dispersion Parameters of Random Quantities

A formulation is given of the problem of an a priori estimation of the accuracy of linear measurements required in order to achieve a specified accuracy and reliability of determining the circular dispersion parameters of random quantities. An analytical solution of the problem is presented as applied to two types of distribution law for the measured quantities, Maxwellian and Rayleigh–Rice. The solution is illustrated by a numerical example.     

Methods for evaluating the accuracy characteristics of the range finder channel of quantum optical systems

Methods for estimating the instrument error for quantum-optical systems using active and passive optical measures of length are suggested. One is based on simulation of measured pulses reflected from the object and entering the receiving device; another is based on using a section of the fiber optical path. __________ Translated from Izmeritel’naya Tekhnika, No. 5, pp. 19–22, May, 2006.     

基于ADS芯片的高精度位移测试仪的设计

说明了位移计的作用;详细介绍了核心芯片ADS1212的结构、原理及使用方法;描述了高精度位移测试仪的设计全过程,给出了整体框图、部分的设计电路图和程序模块。     

单/多基地声呐定位性能比较

根据多基地声呐系统的特点，研究了用单纯基于声波到达时间(TOL)算法进行水下目标定位的原理和误差分布。通过数值仿真，给出了用多基地TOL算法进行水下目标定位，误差几何分布的等值线图。仿真结果表明，用多基地声呐系统进行水下目标定位，比同等条件下单／双基地声呐定位，具有更高的定位精度。