Effect of highly dispersed sputtered silver nanoparticles on structural properties of multiwalled carbon nanotubes

A simple method to decorate mutliwalled carbon nanotubes (MWCNTs) with silver nanoparticles (Ag NPs) to enhance the structural properties is reported in the present study. The Ag NPs of average size 9 nm were deposited uniformly on MWCNTs network by RF sputtering technique. X-ray diffraction (XRD), Raman spectroscopy and Scanning electron microscopy (SEM) are used to compare the structural properties of Ag NPs sputtered nanotubes with those containing functionalized tubes. In addition, effect of these Ag NPs on the surface of nanotubes and optimization of the experimental parameter for uniform deposition of Ag NPs are also discussed.     

ZnCdO: Status after 20 years of research

With the increasing attention devoted to ZnO in the late nineties, the discovery of ZnCdO as a means of reducing its bandgap towards visible wavelengths promised it a bright future in optoelectronics, which should run in parallel to its possible applications as a transparent conducting oxide. This review will cover the developments achieved so far in the growth of ZnCdO, in the understanding of its structural properties, paying special attention to the competition between wurtzite and rocksalt phases, as well as in the analysis of its optical and electronic properties. Finally, some of the devices demonstrated with ZnCdO will be reviewed together with the difficulties they have encountered.     

美国电信改革得失评述及对中国电信改革的思考

对美国电信改革进行了简要回顾的同时对不同阶段管理措施的功过得失进行评述：在所史分析的基础上,提出了“规模”与“创新”之间的结构性矛盾是电信业有效竞争的根本障碍;结合中国电信改革的实战,提出中国电信改革应缩续坚待循序渐进的改革原别,改革重点应该是鼓励创新而非降低价格。积极探索有效的资源共享机制,寻求电信业结构性矛盾的解决之路。     

Development of a triangular-plate MEMS tunable capacitor with linear capacitance-voltage response

This paper introduces a modified structure for parallel-plate-based MEMS tunable capacitors. The capacitor has triangular electrodes with geometric and structural asymmetry, which enhances its performance. The device structure is also equipped with a set of cantilever beams between capacitor’s electrodes, called middle beams. These beams provide extra stiffness as tuning voltage increases and delay the pull-in which results in a higher tunability. They also reduce the high sensitivity of the capacitance to the voltage change and linearize the C-V response. An analytical model is developed to optimize the capacitor’s dimensions for maximum linearity of the response. Numerical simulations demonstrate tunabilities over 150% where more than 2/3 of which is highly linear. Capacitors fabricated with PolyMUMPs verify that the design technique proposed in this paper can improve the linearity of the device and increase the maximum tunability. The proposed design has a simple geometry and is fabricated using three structural layers, and therefore, it can be easily integrated in tunable filters or other RF circuits.     

Structural and electrical properties of brush plated ZnTe films

Zinc telluride thin films were deposited by the brush plating technique at a potential of −0.90 V (SCE) on conducting glass and titanium substrates at different temperatures in the range 30–90 °C. The films were polycrystalline in nature with peaks corresponding to the cubic phase. Direct band gap of 2.30 eV was observed. XPS studiers indicated the formation of ZnTe. Depth profiling studies indicated a uniform distribution of Zn and Te throughout the entire thickness. EDAX measurements were made on the films and it was found that there was a slight excess of Te. The carrier concentration was found to vary from 10¹⁴–10¹⁵ cm⁻³ with increase of substrate temperature. The mobility was found to vary from 5 to 60 cm² V⁻¹ s⁻¹.     

一种联机手写算术表达式识别系统

该文介绍了一个完整的联机手写算术表达式识别系统。在笔划分组与符号识别方面,采用预处理结合搜索的方法优化置信度函数;在结构分析方面,提出了一套全新的基于符号分级的算法,并利用三叉树这种数据结构存储识别结果。实验表明,对于书写较为整齐的算术表达式,此系统能够对较复杂的结构予以正确率较高的分析与识别。     

抓住技术进步的龙头

概述了技术在企业发展中的重要性。只有重视技术、发展技术,企业才能进步和生存。     

基于过程控制的导引头系统软件开发流程

提出一种新的导引头系统软件开发流程,强化了软件开发的分阶段过程控制和管理,建立了相对稳定的软件开发过程,改变了传统软件开发"说做就做"的初始级软件开发模式,克服了传统软件开发无序、混乱的开发状态。在缩短系统软件开发周期的同时,提高了整个系统软件的可靠性和稳定性。     

关于起重机梯子栏杆结构安全使用的几点建议

梯子栏杆结构是起重运输机械必不可少的组成部分，它不仅起着安全保护和通道作用，也会对主体结构的承载性能产生影响，然而在结构设计、制造和使用维护方面往往容易忽视它的作用。基于此，本文提出了起重机梯子栏杆结构在设计、使用过程中应注意的几个问题。     

考虑分级开挖的深基坑支护计算

 提出了考虑深基坑变形的一种新的支护结构计算方法——弯杆计算法，在弯杆法的有限元计算中， 通过变换座标的方式考虑上一级开挖的变形，从而达到考虑分级开挖的工况。实例验算表明，该程序能够计算出支护结构变形的变化趋势，并给出了简要的自编计算程序框图。