电子线路的数值优化设计

研究了电子线路的数值化设计方法.它是一种自动化程度高、通用性强、精度高的电路设计方法。介绍了电子线路数值优化设计软件系统YJX—1.它具有广泛的通用性和快速收敛的特点。     

激光除锈过程的实时监测技术研究

对激光除锈过程中的实时监测技术进行了实验研究,结果表明:除锈过程中产生的声波强度会随着表面清洁度的变化而发生明显的变化,声波信号包含了除锈过程中的大量信息,可作为激光除锈实时监测的基本信号.     

边界衍射波理论公式的准确性数值分析

利用数值分析的方法分析了由边界波理论公式所得的圆形光阑衍射场的光强分布.通过对边界波理论公式所得的光强分布曲线,对几何照明区与阴影区的光强分布曲线与面衍射积分公式所得的光强分布曲线进行比较,分析了边界波理论公式对衍射场描述的准确性.     

Dielectric effect on the rf characteristics of a helical groove travelling wave tube

A new type of partial-dielectric-loaded helical groove slow-wave structure (SWS) for millimetre wave travelling wave tube (TWT） is presented in this paper.The radio-frequency characteristics including the dispersion properties,the longitudinal electric field distribution and the beam-wave coupling impedance of this structure are analysed.The results show that the dispersion of the helical groove circuit is weakened,the phase velocity is reduced and the position of the maximum Ez is moved from the mouth to the inside of the groove after partially filling the dielectric materials in the helical groove SWS.Therefore,the dielectric-loaded helical groove SWS is suitable for a multi-beam TWT with broad band and high gain.     

光化学气相淀积SiGe/Si材料的机制分析

本文对光化学气相淀积SiGe/Si过程中气相反应机制和表面反应历程进行了分析和讨论.利用表面反应动力学的有关理论,结合光化学气相淀积的特点,推导出光化学气相淀积SiGe/Si过程中的生长速率和生长压力的关系.并给出该理论结果和实际实验结果的比较.     

The Existence of Solutions to Sturm-Liouville Boundary Value Problems with Laplacian-like Operator

Abstract The existence of infinitely many solutions to Sturm-Liouville boundary value problem with aLaplacian-like operator is studied by applying generalized polar coordinates.     

新型丙烯酸多元共聚物增稠性的研究

1 实验部分1.1 原料及其规格(见表1)1.2 乳胶液的合成方法 在装有搅拌器、回流冷凝管、温度计和滴液漏斗的250ml三瓶中进行乳液共聚合,其反应温度为85±1℃。不同聚合方法和加料顺序如下。1.2.1 半连续加料法 乳化剂和水溶解均一后,升至一定温度,加入全部引发剂;继续升温,然后滴加全部AA和部分BA及MMA、St混合单体混合物;全部加完后再将剩余混合单体在1h内滴加完,保温一定时间,降温至40℃出料。     

FMS在线刀具存取策略研究与系统开发

该文在已有刀具管理系统管理方法的研究基础上，针对ＦＭＳ刀具在线管理系统的结构特点，建立了ＦＭＳ在线刀具管理的体系结构，并提出了适用于ＦＭＳ、ＣＩＭＳ的刀具存取策略算法，包括进出站管理、机床局部刀库管理、中央刀库管理等几部分，最后对其进行了软件开发。     

Efficient synthesis of an aldehyde‐capped polythiophene containing fluorinated electron‐withdrawing groups

To incorporate an acceptor type polythiophene segment onto a supramolecular block copolymer for potential light harvesting applications, effective synthetic routes for the end‐functionalized and acceptor‐substituted polythiophenes are critical. The Ullmann coupling reaction can be utilized to obtain electron‐deficient polythiophenes and to attach terminal thiophene units that carry functional groups. In this article, the reactions involving a 2,5‐dibromothiophene monomer containing an electron‐withdrawing fluorinated ester and 5‐bromo‐2‐thiophenecarboxaldehyde (the end‐capper) were studied in detail. It was found that the Ullmann coupling reaction of the dibromide is very fast (completed in a few minutes) and the terminal bromine group does not survive long under the reaction condition. These findings lead to the development of an effective procedure for aldehyde end‐capping of electron‐deficient polythiophenes. Polymers with molecular weights around 4000 Da are routinely obtained. © 2006 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 45: 41–47, 2007