新型缓蚀杀菌剂双季铵盐在油田中的应用

从双季铵盐的结构、合成以及由其特殊结构所带来的奇特界面吸附(气/液、固/液界面吸附)特性和化学性质,阐述了新型缓蚀杀菌剂双季铵盐的缓蚀、杀菌机理和作为油田注水缓蚀杀菌剂的研究现状,同时论述了其在油田其它领域(如:驱油,含油污水浮选等)中的应用前景。     

Lateral Current Confinement Determines Silicon Avalanche Transistor Operation in Short-Pulsing Mode

The transient in a Si bipolar junction transistor was investigated in high-current short-pulsing ( 2 ns) mode both experimentally and numerically. A comparison of measured and simulated waveforms clearly showed that only a small fraction of the perimeter of the emitter-base interface (in the lateral direction) takes part in the switching transient when a capacitor of relatively small value (80 pF) is discharged across the transistor to obtain a current pulse of a few nanoseconds in duration. A good agreement was found between measurements and simulations in the 2-D numerical model when the effective operating perimeter was used as a parameter in the model. The results allowed reliable analyses of the thermal regime to be performed. Possible reasons for the significant current confinement in short-pulsing mode and relatively homogeneous transistor switching with longer current pulses are discussed, and a mechanism of fast lateral turn-on spread is assumed. One conclusion of practical importance is that a short-pulsing relatively high-current mode could not be realized without current confinement in the lateral direction.     

水滑石类插层组装功能材料

水滑石类(LDHs)化合物是一类典型的阴离子型层状材料。LDHs的构筑单元和结构的可控性和多样性,为此类材料的应用研究提供了广阔前景。以LDHs的层状结构和可插层性为线索,介绍了LDHs的结构特征和制备化学,讨论了阴离子插层LDHs的组装原理和主-客体相互作用,对基于主体层板调控及主-客体相互作用的多种插层LDHs功能材料的制备和应用进行了综述,并对LDHs的结构创新和制备技术的研究方向进行了展望。     

Chaotic Spread- Spectrum Communication using Discrete-Time Synchronization

ＣｈａｏｔｉｃＳｐｒｅａｄＳｐｅｃｔｒｕｍＣｏｍｍｕｎｉｃａｔｉｏｎｕｓｉｎｇＤｉｓｃｒｅｔｅＴｉｍｅＳｙｎｃｈｒｏｎｉｚａｔｉｏｎＷａｎｇＨａｉａｎｄＨｕＪｉａｎｄｏｎｇ（ＤｅｐａｒｔｍｅｎｔｏｆＴｅｌｅｃｏｍｍｕｎｉｃａｔｉｏｎｓＥｎｇｉｎｅ...     

CT-2线开卷机面板技术改进

为克服武钢硅钢片厂ＣＴ－２线开卷机上钢卷产生塔卷问题而增设的面板在运行过程中坠落和面板的主要零件寿命极短等问题，实施了改进，本文就面板在运行中坠落的原因进行了分析，对改进型面板的构思与设计进行了介绍。     

NBR／PP基热塑性耐热油橡胶的研制

分别选择ＭＰ、ＭＡＤ等作为ＮＢＲ／ＰＰ增容体系，对于橡胶比以及不同牌号的基质对产品性能的影响也进行了探讨。在讨论硫化系时，采用了３种不同的硫化体系：ＤＣＰ体系，酚醛树脂体系以及硫磺体系，并对它们分别进行了探讨。通过动态全硫化技术制得了 耐热油性能的热塑性橡胶，通过进行透射电镜的分析对产品的亚微观结构和结晶相形态也进行了探讨。     

DOW火灾爆炸指数评价法在输油站场的应用

为了客观地评价输油站场的安全性，采用“DOW化学公司火灾、爆炸指数评价法”来确定物质、设备及工艺装置等存在的潜在危险性，定量计算火灾爆炸可能导致的危害程度和停产损失，是一种有效的手段。     

准同步CDMA及其在卫星移动通信中的应用

研究了一种新颖的多址准同步CDMA方式，理论推导了准同步CDMA性能表达式，在性能评价的基础上，构造了两放新的扩频码集，分析表明，采用新码集时，准同步CDMA性能要远优于异步CDMA，最后分析了卫星移动通信系统反向信道采用准同步CDMA时的性能。     

Electroelastic Analysis of a Piezoelectric Layer with Electrodes

The electroelastic analysis of a piezoelectric layer with two semi-infinite electrodes is made. The layer surfaces are clamped and a voltage is applied between the layer surfaces and the electrodes. By using the integral equation method, the electroelastic field is derived for the cases of crack-type electrodes and of rigid electrodes, respectively. It indicates that the concentration of electric field an electric displacement occurs near the electrode tips for both cases. However, the stresses are bounded for the former, and possess singularity for the latter. The field intensity factors and energy release rate are obtained in explicit form. The counterpart for a single semi-infinite electrode is given.