微计算机在压缩机性能测试中的应用

本文介绍以微型计算机为核心，由传感器，变送器等设备组成的冰箱压缩机内部性能自动测试系统的基本结构，重点论述了系统的硬件和基本电路及其软件的实现。     

RESAMPLING TESTS OF STATISTICAL HYPOTHESES

ＲＥＳＡＭＰＬＩＮＧＴＥＳＴＳＯＦＳＴＡＴＩＳＴＩＣＡＬＨＹＰＯＴＨＥＳＥＳ￥（石坚）ＳｈｉＪｉａｎ（ＩｎｓｔｉｔｕｔｅｏｆＳｙｓｔｅｍｓＳｃｉｅｎｃｅ，ＡｃａｄｅｍｉａＳｉｎｉｃａ，Ｂｅｉｊｉｎｇ１０００８０，Ｃｈｉｎａ．）Ａｂｓｔｒａｃｔ：Ｉｎｔ...     

TDRSS中的码同步技术

本文对ＴＤＲＳＳ中的码同步技术进行了理论研究。首重讨论了定长检测和序贯检测这两种捕获方法。基本理论分析和ＴＤＲＳＳ正返向链路同步性能的计算结果，序贯检测的捕获性能优于定长检测的性能。     

The relationship between moisture resistance and epoxy molding compounds in integrated circuits

The influence of epoxy molding compounds on metallized aluminum corrosion in a Pressure Cooker Test (P.C.T.) was investigated by a monitor chip encapsulated in a dual in-line package (D.I.P.). The monitor chip is composed of a leakage current measuring part which has opposite metallized aluminum tracks and an aluminum corrosion measuring part which has metallized fine aluminum tracks. The formulation of the epoxy molding compound was changed for the average particle size of fillers, the internal release agents, and the coupling agents. The relationships between the stress of the epoxy molding compounds and moisture resistance was also investigated by using epoxy molding compounds which had different characteristics of stress.     

氟碳加压检漏法用于光电器件的一些问题及探讨

氟碳加压检漏法,灵敏度高,可靠性好,已被列为机电部元器件密封性检测的标准方法。但在用于半导体光电器件时却出现漏孔严重堵塞、光学窗口炸裂、指示液易污染等问题。本文根据长期观察、实践,对上述破坏性现象进行了分析、验证,并在如何避免其发生及妥善处理方面作了有益的探讨。     

软件测试用例集缩减的一个算法

一个测试用例集可能含有冗余的测试用例。在回归测试中为了减少维护测试用例集和执行测试用例的成本,可以采用测试用例集缩减的技术。文章提出了一个测试用例集缩减的新算法,并给出了应用实例。     

一种新的域间路由穿透性测试方案

域间路由系统是Internet的关键支撑,然而由于其自身的脆弱性而存在着许多安全问题。文章从域间路由系统安全测试的角度出发,基于路由毒素模型设计并实现了一个域间路由穿透性测试系统。该系统可以探测目标网络的路由信息,对路由信息进行脆弱性分析,依据分析结果选择适当的测试类型进行穿透性测试,并给出增强目标网络系统安全的建议。     

VRLA蓄电池运行维护和试验数据分析

提出VRLA蓄电池必要的维护项目,介绍VRLA蓄电池运行和试验数据的分析方法。这些方法适用于VRLA蓄电池的日常维护,也可用于对意外故障的分析判断及处理。     

Test, diagnosis and fault simulation of embedded RAM modules in SRAM-based FPGAs

This paper presents a unique scheme for testing and locating multiple stuck at faults in the embedded RAM modules of SRAM-based FPGAs. The RAM modules are tested using the MATS++ algorithm. The interconnection scheme makes it possible to test all the cells within the RAM modules in the FPGA in just one test configuration. We also develop a diagnosis scheme capable of locating the faulty RAM cells and the CLB in which it is located. In this research, emphasis is also laid on reducing the testing time, which is achieved by partitioning the FPGA into two halves.     

Measurement of airborne sound insulation of timber noise barriers: Comparison of in situ method CEN/TS 1793-5 with laboratory method EN 1793-2

Recent progress in the development of European standards has allowed the in situ testing of roadside noise barriers. CEN/TS 1793-5 describes a test method using maximum length sequences (MLS) for the characterisation of airborne sound insulation. However, many barriers are tested according to a laboratory standard, EN 1793-2, based on measurements carried out in reverberant chambers and in the case of timber barriers with a relatively low airborne sound insulation it is not clear to what extent the results of the two tests compare. The paper describes the results of tests carried out using both methods. Six samples of timber barrier were compared including single-leaf and double-leaf constructions and single-leaf constructions with an absorptive core. Very good agreement was found especially when account was taken of the valid frequency range in each test method. The results open up the possibility of routinely evaluating the performance of timber barriers at the roadside where build quality can be variable and there are concerns that the acoustic performance may not match that obtained under laboratory test conditions where typically the barrier is more carefully constructed.