酸,碱两步催化合成聚钛硅氧烷铝基材涂膜的研究

聚钛硅氧烷底涂液是用Ｎ－［３－（三乙氧基硅烷］－４，５二羟咪唑和钛烷氧化物在甲醇、水溶液中以酸和碱两步催化水解、缩聚而成，该底涂液涂复在铝基材上经热解，脱碳化物转化成准无机耐蚀涂膜，下述因素对涂膜的耐蚀性起到了重要作用：（１）涂膜的厚热解温度；（２）膜与基材之间的界面结合；（３）介质对涂膜的润湿性。     

ABS/镁盐晶须复合材料的研究

以（乙烯／乙酸乙烯酯／苯乙烯）三元共聚物（BS树脂）为增容荆，采用双螺杆挤出机制备了（丙烯腈／丁二烯／苯乙烯）共聚物（ABs）／镁盐晶须复合材料，研究了BS树脂、镁盐晶须用量对复合材料力学性能、流动性能的影响、结果表明，加入BS树脂有利于提高复合材料的拉伸强度和冲击强度，复合材料的熔体流动速率（MFR）随BS树脂用量增加而增大，且其MFR对温度或负荷呈非线性函数关系，比ABS对负荷更为敏感．     

纳米二氧化硅增强、增韧聚丙烯的研究

研究了纳米二氧化硅改性聚丙烯体系的热处理前后力学性能和加入交联剂、弹性体对该体系的影响。结果表明，纳米SiO2添加量在2％左右时，可提高聚丙烯的拉伸强度10％、拉伸弹性模量30％、冲击强度80％。聚丙烯经140℃热处理并加入2.0％～2．4％的DVB交联剂和二次挤出加工，可以进一步提高该体系的拉伸强度和冲击强度。     

聚氨酯浇注弹性体的合成研究

采用2种不同的预聚体合成方法制备聚氨酯浇注弹性体,并对其性能进行了测试。结果表明,分步加入扩链剂乙二醇的预聚体合成工艺所得浇注聚氨酯弹性体的拉伸强度比一次性加入乙二醇的预聚体合成工艺所得浇注聚氨酯弹性体的拉伸强度提高了70%左右,而伸长率变化不大。同时研究了这2种制备工艺对材料动态力学性能的影响。并探讨了不同R值及配方中交联剂用量对聚氨酯浇注弹性体力学性能的影响。     

软土边壁(坡)流鼓破坏模式研究

依据相似模型原理及所建立的相似法则,对软土边壁（坡）破坏模式进行了实验研究。试验研究证实,刚体转动假设不适用于软土边壁（坡）稳定性分析;软土地壁（坡）不取圆弧破坏模式,而是取流鼓破坏模式。模型实验结果与现场试验及理论分析计算结果规律基本和,数据较为吻合。     

一种新颖的软件设计方法及其实现

可编程控制器(PC)在工业控制中的应用越来越广泛。在我国,应用PC及其上位机实现洗煤厂全部设备的分布式控制还是第一次。本文提出了一些新颖的程序设计方法,它具有简洁、高效、灵活的特点。该方法的运用节省了计算机资源,改善了系统性能。     

Continuous monitoring of circuit breakers using vibration analysis

This paper reports the results from three years of continuous condition monitoring of high-voltage circuit breakers (CBs) using vibration analysis. More than 1000 vibration patterns from the operating mechanism of three different spring-operated SF/sub 6/ breakers in normal service are analyzed. The patterns are recorded during each opening/closing operation and compared with references to identify timing and frequency deviations. Two of the three investigated CBs were operating well, while the third suffered from several severe problems. A developing failure that caused this breaker to not open on command was identified in advance. The reproducibility of the vibration patterns is high for a faultless CB and this makes it possible to separate faulty conditions from natural variations. The vibration analysis method is, however, dependent on a well-conditioned vibration pattern without noise and with distinct events. If the instrumentation is made sufficiently robust to withstand both the electrical disturbances in a substation environment and the mechanical shocks during CB operation, vibration analysis seems to be a promising technique that can be used on a continuous basis to detect malfunctions in the operating mechanism.     

单组份聚氨酯防水防腐胶研制

用含羟基聚醚、聚酯与芳香族异氰酸酯反应制得性能全面的单组份聚氨酯粘接剂.其物理和化学性能和贮存稳定性与反应物、NCO/OH比、反应催化剂和工艺有关.结果表明该粘接剂在胺催化剂存在时由聚醚,羟值50—100、500—700;聚酯,羟值100—150、200—250;和芳香族异氰酸酯合成而得.它有优良的性能:抗张强度7.8MPa,延伸率:240%,耐磨性2.6mg/1000转.     

Relating computer systems to sequence diagrams: the impact of underspecification and inherent nondeterminism

Having a sequence diagram specification and a computer system, we need to answer the question: Is the system compliant with the sequence diagram specification in the desired way? We present a procedure for answering this question for sequence diagrams with underspecification and inherent nondeterminism. The procedure is independent of any concrete technology, and relies only on the execution traces that may be produced by the system. If all traces are known, the procedure results in either “compliant” or “not compliant”. If only a subset of the traces is known, the conclusion may also be “likely compliant” or “likely not compliant”.     

Bolted Connectors for Stranded Aluminum Power Conductors

Sixteen different commercial bolted connectors for 50 and 240 mm stranded aluminum cable conductors have been examined in order to identify and clarify the correlations between the quality of a connector and its design characteristics, material usage, assembly procedures, bolt numbers and configurations and other relevant parameters. The quality is assessed with basis in resistance measurements after short circuit testing and during thermal cycling as specified by the IEC 61238-1 standard. The tightening torque of the bolts was measured during connector assembly, and the resulting axial compressive forces were calculated. A very strong correlation is observed between this compressive force and the connector quality; large forces give connections with low and stables resistances. The various other design parameters considered are found to have significantly less or in some cases hardly any notable influence on the electrical test results.