高校TD-SCDMA实验室设计

为培养中国自主提出的第三代(3G)移动通信技术:时分-同步码址技术(Time Division-Synchronous Code Division Multiple Access,TD-SCDMA)工程人才,建设TD-SCDMA实验室平台,提出一种通过整合多种媒体,模拟再现TD-SCDMA 硬件结构和工程现场无线操作维护中心及高度仿真的虚拟平台的实验实训方法.该方法与现有的方法相比,具有模拟现网运行、对通信设备对接的融合特点,提供了良好的实训环境,具有很好的实用性.     

珍珠镀镍的电镀工艺参数优化

通过正交试验确定了珍珠镀镍的最佳工艺条件,制备出了效果优良的珍珠镍镀层,提高了镀层的珠光外观和耐腐蚀性．通过金相显微镜照片和电化学技术表征（交流阻抗技术和Tafel曲线测试）对单层珍珠镀镍、单层光亮镀镍和双层珍珠镀镍（光亮镍上施镀珍珠镍）的性能进行了对比．结果表明：双层珍珠镀镍更加均匀致密;单层珍珠镍的耐腐蚀性优于双层珍珠镀镍;双层珍珠镀镍的耐腐蚀性优于单层光亮镀镍．     

基于计算实验的煤矿安全评价方法

现有的煤矿安全评价方法不能根据煤矿的具体情况给出客观评估。针对该问题,提出一种基于计算实验的煤矿安全评价方法。采用探索性分析法制定实验方案,利用Agent建模技术构建仿真环境。实例分析表明,该方法以现场安全状况为实验参数,模拟事故可能的发生过程,专家可根据仿真结果对煤矿安全状况做出较客观的分析及评估。     

Inverse Analyses in Fracture Mechanics

The present purpose is a survey of some engineering-oriented research results which may be representative of the main issues in the title subject. Some recent or current developments are pointed out in the growing area of fracture mechanics centered on the calibration of cohesive fracture models for quasi-brittle materials, by approaches which combine experimentation, experiment simulation and minimisation of the discrepancy between measured and computed quantities. Specifically, reference is made herein to the following topics in calibration of fracture constitutive models: (a) deterministic characterisation of concrete-like materials by traditional three-point-bending tests (TPBTs), supplemented by optical measurements; (b) wedge-splitting tests (WST) and extended Kalman filter (EKF) for the stochastic estimation of fracture parameters; (c) in situ parameter identification for the local diagnosis of possibly deteriorated concrete dams on the basis of flat-jack tests; (d) fracture properties of ceramic materials and coating-substrate interfaces identified through indentation tests, imprint mapping and inverse analysis in micro-technologies.     

轴流转桨式水轮机空化程度声信号辨识研究

通过空化声信号判断水轮机中的空化程度是水轮机空化检测的方向和难题,为此进行了轴流转桨式水轮机模型转轮空化试验:选择了4个常用桨叶角度,固定桨叶角度和水头,调整尾水位改变空化状态,试验中用频率范围达1MHz的超声传感器测量空化声信号,并对转轮室空化进行录像。通过观察试验闪频录像,把空化严重程度划分为4个典型的级别,以此作为验证声信号辨识算法的判据。在分析试验数据的基础上,提出空化声信号特征矢量分类法,即把采集到的声信号按频段划分,每个频段的方差作为一维,组成空化特征矢量、通过对特征矢量的空间分类来判别轴流转桨式水轮机空化严重程度。用该方法处理所有试验数据,给出与录像观测进行比较的统计结果,表明该方法是可行和有效的。     

虚拟仪器技术在模拟电子技术实验中的应用

给出了虚拟仪器技术的概念。并提出了一种用于模拟电子技术实验的虚拟仪器设计方案。     

Probability Hazard Analysis of the Operation of Pipeline Systems,Tanks, and Pressure Vessels. Part 2. Method for the Evaluation of the Functional Fitness of a Structural Element According to the Restricted Statistical Data

We describe a procedure used for the evaluation of the engineering state of structures according to the “fitness-for-service” criterion based on the application of restricted amounts of statistical data, which can be obtained in the process of operation, testing, or numerical simulation. We propose a quasioptimal sequential statistical criterion capable of making decision concerning the functional fitness of objects with probability errors of the first and second kind that do not exceed specified values. The practical realization of the probability risk analysis of the operation of pipeline systems, reservoirs, and pressure vessel is performed in the form of a software methodical complex of the “Mitsnist’” expert system.__________Translated from Problemy Prochnosti, No. 3, pp. 96 – 103, May – June, 2005.     

马寨油田分层开采提高采收率研究

马寨油田为低渗透强亲水油藏，层间渗透率差异大，原油粘度低，井网密度大。由于多年的合采使油田综合含水高达92．9％，工业采出程度仅为76．6％。结合马寨油田的开采特点，论述了分层开采提高采收率的潜力，通过岩心实验证明了马寨油田分层开采可以提高采收率，现场应用结果证实了该结论。为该油田的层间产能接替提供了一个有效的开发方式，对同类油田也具有普遍的指导意义。     

A Controlled Experiment to Evaluate On-Line Process Guidance

Process-centered software engineering environments are expected to improve an individual's comprehension of work activities, as well as improve communication and reduce conflicts among teams of software developers. We chose to investigate individual responses when using such an environment before looking for a group response. A controlled experiment compared off-line and on-line implementations of measurement-based process guidance to test three hypotheses: first, individuals accomplish their work more efficiently when using on-line process guidance as compared to off-line guidance; second, individuals are willing to use an on-line system for guidance; and third, individuals adjust their behavior based on quantitative quality models. The subjects worked alone on two testing exercises. Subjects used either an off-line or an on-line guidance technique during the first exercise, and the other technique during the second exercise. The results did not confirm the hypotheses. On average, subjects worked more efficiently when using off-line guidance, preferred off-line guidance, and ignored quantitative quality models. Post hoc analysis identified a strong correlation between subject experience level and preference for the type of guidance, a result that deserves further investigation.     

应用正交试验法估计未知参数

很多生产、计划、管理或科研课题需要借助函数关系的计算，寻求优良的参数组合。文中利用正交表［１］的均衡分散性和整齐可比性以及计算机的快速运算能力，给出了多变量系统未知参数自动选优的一种算法。本算法只需要若干组实测数据，对系统本身不作具体要求。将此算法应用在某一元非线性函数上（用Ｆｏｒｔｒａｎ语言编程并在微机上运行通过）。计算结果表明，该算法不仅有效，而且能在较短时间内达到额定要求，该算法具有教强的可操作性。从应用角度来看，该算法在多变量的情形下更能发挥其作用，可为有关工程技术人员提供理论参考。