结构稳定性

Many swarm parameters have been obtained such as the electron density distribution, the energy and spatial distribution of the emitted electrons from the MHCD at various voltage and different dimension of micro-hollow cathode. Micro-hollow cathode discharges with slot and cylindrical cathode have been done, results show that pressure, cathode structure and the gas mixture will affect the stability of glow discharge. Micro-hollow cathode discharge array was obtained by individual ballasted discharge unit.

进行了槽型和孔型微空心阴极放电的实验，不同的气压、电极结构以及气体配比对放电稳定性有着明显的影响；采用分段镇流的方法，进行了微空心阴极阵列放电的实验研究，得到了均匀放电；做了大气压下MHCD自持的辉光放电研究。

started with the analysis of characteristic parameter of the successive detection logarithmic amplifier,mainly discusses the main factor affecting its transfer characteristic by mathematics reasoning to its transfer function,studies the correlative relations of the single stair′s plus,the series with the dynamic range and the logarithmic precision by matlab and matrixx simulation.so two pieces of conclusion have been reached:one is on condition that the dynamic range is limited,the more the series that is used and the single stair′s plus is less,the higher the logarithmic precision is.the other is that using the double amplifier chain can enhance the logarithm starting point,so its stability is improved.and the conclusion has been applied to the practical circuit′s analysis of the tacan beaconing receiver.

摘 要：从分析连续检波式对数放大器的特性参数入手，对其传输函数进行了数学推导，重点讨论了影响其传输特性的主要因素，通过matlab和matrixx仿真，研究了输入动态范围与级联级数、单级增益和对数精度的相互关系，得出了两点结论：一是在限定动态范围的前提下采用的级数越多其单级增益越小而精度就会越高，二是采用双放大链结构可以提高对数起点，从而提高其稳定性。最后将结论应用于塔康信标接收机实际电路的分析中。关键词：对数放大器；连续检波；塔康信标；对数精度

The spacious work platform and high beaning capacity have enlarged the aerial service scope of the platform and make it suitable for several persons working together simultaneously.

它的剪叉式机械结构，使升降台起升后有较高的稳定性，宽大的作业平台和较高的承载能力，使高空作业范围更大，并适合多人同时作业。

It indicated that the multiple-layered films were mainly composed by C-F, C=C and Si-O bonging, a little Si-C and Si-F bonding were also existed because of history effect. The bondgap were calculated as 2.7eV. The dielectric constant of the multiple-layered films was close relative to the thickness of the covering layer-SiOx, so the thickness had better be reduce. The bonding configurations of multiple-layered films had no evident changes after 400癈 annealing, the thickness raise very little and the dielectric constant increase 8%. Compared with one-layered a-C:F films prepared in the same conditions, the SiOx/a-C:F/SiOx multiple-layered films had a better thermal stability.

结果表明，多层膜主要由C-F，C=C，Si-O键构成，由于器壁的历史效应，薄膜中还存在少量Si-C和Si-F键；多层膜的光学带隙经计算约为2.7eV；多层膜的介电常数与包层SiO_x厚度有很大关系，应尽可能减小SiO_x厚度；在经历200-400℃的N_2氛围中退火后，多层膜的红外结构没有发生太大的变化：膜厚度稍微增大，介电常数只增加了8％，与同样制备条件下沉积的单层a-C：F薄膜相比具有较好的热稳定性。

The structure and thermal behavior of nanocomposites were charactered by IR,TEM, XRD and TGA.

通过红外、透射电子显微镜及X射线衍射仪表征了复合材料的结构：通过热失重分析仪表征了纳米复合材料的热性能；并测试了无机纳米粒子以及纳米复合粒子在有机溶剂中的分散稳定性；并采用粒度分析仪测试了复合乳液的粒度大小及其分布。

The coking and deactivation process of benzene and ethylene alkylation reaction over AB-97 zeolite has been studied systematically. The results of acceleration deactivation reaction indicate that deactivation process go through three phases, high level activity stability period, activity decline period and low level activity stability period. The mechanism of this phenomenon was analyzed by the way of the experiment research of pore structure and acid quality of coked zeolite. It is concluded that reducing the strong acid active centers and crystal outer-surface active centers are benefit to improve the activity stability of zeolite.

在AB-97型分子筛催化剂上对苯/乙烯烷基化制乙苯反应体系的结焦失活历程系统实验研究，催速失活实验结果表明失活历程经历高水平活性稳定期，活性衰退期和低水平活性稳定期三个阶段，并通过对失活催化剂的孔结构及酸性质的实验研究，对这一现象进行了机理分析，认为催化剂改性研究中采用降低强酸活性位和晶粒表面活性位这两种手段都有利于改善催化剂的活性稳定性。

The stability,relative density,mechanical properties and microstructure of the compacts synthesized at different temperatures were investigated.

研究了不同烧结温度对γ-Si_3N_4稳定性、相对密度、力学性能及显微结构的影响。

The result indicates that the correct principle of crazes, the stability of crazes and the existence of crazes cause the two-layered alterable-burning rate propellant to have low temperature coefficient.

实验结果表明了银纹原理的正确性、银纹的稳定性及银纹的存在使双层结构变燃速发射药具有明显的低温度系数。

First of all, this thesis introduces the configurations of mechanism system and control system, describes the PID characteristics parameters and their means, analyses the controlled system's stability and debugs the system based on the theory characteristic, and get some good debug methods.

首先，本文介绍了受控五杆机构的机械系统和控制系统结构，阐述了试验台的PID控制参数特性及其意义，并在其PID理论基础上对基于PMAC控制器的五杆机构进行了稳定性分析及调试，总结出了其相应的调试方法。

Influence of deposing condition on the grain size, crystal structure and surface properties of nano-TiO_2 was investigated; the existing position and action of TiO_2 in oil/water system was also studied. Results of photographs show that nano-TiO_2 can enter the oil/water interface and well dispersed, a solid film is formed and well stability.

3采用溶胶-凝胶法及掺杂调制技术制备了纳米TiO_2光催化剂，考察不同的热处理条件对二氧化钛(TiO_2)纳米粒子的晶粒尺寸、晶体结构、表面性质的影响，并研究了纳米TiO_2在油／水体系中的形态与存在形式，显微图像观察结果表明，TiO_2纳米粉可以进入油／水界面，在油／水体系中具有较好的分散性能和界面性质，形成一层固体膜，并且具有很强的稳定性。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。