Dynamic Faults in Random-Access-Memories: Concept, Fault Models and Tests

The ever increasing trend to reduce DPM levels of memories requires tests with very high fault coverage and low cost. This paper describes an important fault class, called dynamic faults, that cannot be ignored anymore. The dynamic fault behavior can take place in the absence of the static fault behavior, for which the conventional memory tests have been constructed. The concept of dynamic fault will be established and validated for both dynamic and static Random-Access-Memories. A systematic way to develop fault models for dynamic faults will be introduced. Further, it will be shown that conventional memory tests do not necessarily detect its dynamic faulty behavior, which has been shown to exist in real designs. The paper therefore also presents new memory tests to target the dynamic fault class.     

砷化镓共面波导内部微波信号的电光取样检测

本文报道了共轴反射式电光取样系统。该系统时间分辨率不低于20ps,空间分辨率不低于3m。用它检测了砷化镓共面波导内部的微波信号。这套系统将被应用于砷化镓高速集成电路内部特性的在片检测。     

井下套管阀研究及室内试验

随着欠平衡钻井技术的深入研究和推广应用,全过程欠平衡钻井技术已成为研究热点。除了常规的欠平衡装备外,全过程欠平衡钻井还需配备井下套管阀,为此,研制了一种双液控井下套管阀。为检验该阀的使用可靠性,进行了全面的室内试验和测试,试验内容包括压力密封能力,高压、有流动情况下阀板关闭的动作准确性,模拟现场阀板下憋压时打开阀板的作业程序,检测在各种密封压力时阀的微泄漏量。试验结果表明,该阀达到设计要求,能够满足全过程欠平衡作业的工艺要求。     

模糊综合评判法在优选改性剂中的应用

各种各样的改性剂在高等级路面中被广泛应用,因而改性剂优选成为一个问题。采用二级模糊综合评判的方法对此进行了研究。针对中国南方高温、多雨的特点,对基质沥青混合料、路孚8000改性沥青混合料、TPS改性沥青混合料和SBS改性沥青混合料进行了路用性能试验,包括高温稳定性、低温抗裂性、水稳定性和抗疲劳性能试验;并应用模糊综合评判的方法进行性能评价,得到了定量的综合路用性能排序。结果显示模糊综合评判是优选改性剂的有效方法。     

A Coating that Combines Lotus‐Effect and Contact‐Active Antimicrobial Properties on Silicone

The antimicrobial equipment of materials is of great importance in medicine but also in daily life. A challenge is the antimicrobial modification of hydrophobic surfaces without increasing their low surface energy. This is particularly important for silicone‐based materials. Because most antimicrobial surface modifications render the materials more hydrophilic, methods are needed to achieve antimicrobial activity without changing the high water‐contact‐angle. This is achieved in the present work, where SiO₂ nanoparticles are prepared and functionalized with 3‐(trimethoxysilyl)‐propyldimethyloctadecyl ammonium chloride (QAS) in a one‐pot synthesis. The modified nanoparticles are applied onto a silicone surface from suspension with no need of elaborate pretreatment. The resulting surface exhibits a Lotus‐Effect combined with contact‐active antimicrobial properties. The particle surfaces show self‐organizing micro‐ and nanostructures that afford a water‐contact angle of 144° and a hysteresis below 10°. The particles are self‐adhering on the silicone after solvent evaporation and resistant against immersion into and washing with water for at least 5 d. Thereby, the adhesion of the bacterial strain Staphylococcus aureus to these surfaces is reduced and the remaining bacterial cells are killed within 16 h. This is the first example of a Lotus‐Effect surface with intrinsic contact‐active antimicrobial properties.     

Characterisation and modelling of a 5 kW PEMFC for transportation applications

In the framework of the French inter lab SPACT project (fuel cell systems for transportation applications), a 10 kW PEM fuel cell testing bench has been installed in 2002 in the national fuel cell test platform located in Belfort, France. The behaviour of a 5 kW fuel cell, fed with humidified pure hydrogen gas and compressed air, has been investigated by the Laboratory of Electrical Engineering and Systems (L2ES) in association with the French National Institute for Transport and Safety Research (INRETS).     

p型碲镉汞液相外延材料Ag掺杂的研究

利用SIMS和变温霍尔测量手段对P型Hg0.77Gd0.23Te液相外延材料的Ag掺杂技术、机理及掺杂碲镉汞材料的性能进行了研究。结果表明采用AgNO3溶液直接浸泡方式对该材料进行掺Ag是成功的，掺杂浓度与被掺杂材料中的汞空位浓度是一致的，掺杂后，P型碲镉汞材料的受主能级比掺杂前有明显的减小，从实验结果可看到掺Ag碲镉汞材料的电学性能在室温下保持稳定。     

基于紧缩阈值加速退化试验的长寿命产品可靠性评估

对于退化失效型产品,当产品的特性参数超过给定阈值时即发生失效,失效阈值定义越严格则对产品功能要求越高,则产品越容易发生因不满足该功能要求而失效,可见产品的寿命数据与失效阈值的定义密切相关.对于长寿命产品,通过紧缩失效阚值的方法,可以在低应力水平下得到更多的失效数据.论文建立了寿命分布与试验应力和失效阈值的关系模型,并提...     

等应变速率固结试验的研究

等应变速率固结试验是连续加荷固结试验的一种方法。连续加荷固结试验是一种比较合理的,有一定理论依据的快速固经试验方法。试验结果优于常规固结试验。通过对比试验资料分析研究,证实连续加行固结试验,可以大大缩短试验时间,改善试样受力条件,得到更可靠的试验结果。     

新丰江大坝振动监测与安全评估

本文首先介绍新丰江坝、水电厂房及变电系统（ＧＩＳ）设施的最近的振动试验结果;其次,根据新丰江坝历次振动监测资料对比分析,研究了坝体振动特性与弹性波速变化趋势,提出了计入水库影响的坝体前三阶振动频率经验计算公式,对坝体混凝土强度变化程度作了估计;最后,基于振动监测数据与计算分析,给出了大坝及厂房等设施的安全评估结果。