MEMS Test System Based on Virtual Instrument Technology

On account of the multiformity of MEMS devices, it is necessary to integrate with some optical measurement techniques for meeting static and dynamic unit test requirements. In this paper, an automated MEMS test system is built of some commercially available components and instruments based on virtual instrument technology. The system is integrated with stroboscopic imaging, computer micro-vision, microscopic Mirau phase shifting interferometry, and laser Doppler vibrometer, and is used for the measurement of full-view in-plane and out-of-plane geometric parameters and periodical motions and single spot out-of-plane transient motion. The system configuration and measurement methods are analyzed, and some applications of the measurement of in-plane and out-of-plane dimensions and motions were described. The measurement accuracy of in-plane dimensions and out-of-plane dimensional is better than 0.2 μm and 5 nm respectively. The resolution of measuring in-plane and out-of-plane motions is better than 15 nm and 2 nm respectively.     

数据安全路由器的加密技术

通过介绍数据加密技术原理，针对较实用的非对称密钥加密技术，提出了两种在路由器安全连接中的实现方法，CET和Ipsec技术，这两种技术方法简单、实用，为数据在网络中的安全发送提供了可靠的保障。     

Copolymerization of Acrylonitrile/1-Vinyl-3-Ethylimidazolium Bromide and Rheological,Thermal Properties of the Copolymer

Acrylonitrile(AN)/1-vinyl-3-ethylimidazolium bromide(VIMB) copolymer was prepared via solution polymerization using dimethyl sulfoxide(DMSO) as a solvent and azodiisobutyronitrile as an initiator. The effects of comonomer VIMB on the polymerization, rheological properties of the polymer solution and thermal properties of the copolymer were investigated. The ionic liquid VIMB resulted in higher polymerization conversion ratio and higher average molecular weight when copolymerized with AN than itaconic acid(ITA). Rheological measurements indicated that the transition shear rate increased linearly with increasing temperature for P(AN/ITA)/DMSO solution, while an exponential growth with temperature was observed for P(AN/VIMB)/DMSO solution. The exothermic peaks of DSC curves in N_2 appeared at 276.67 and 257.34 °C for P(AN/VIMB) and P(AN/ITA), respectively. As a potential comonomer of AN for PAN carbon fibers, the VIMB resulted in about 7% higher char yield in N_2, and 23.7% less weight loss at 600 °C in air than ITA copolymer.     

3D finite element analysis of TBM water diversion tunnel segment coupled with seepage field

In most studies of tunnel boring machine(TBM)tunnelling, the groundwater pressure was not considered, or was simplified and exerted on the boundary of lining structure. Meanwhile, the leakage, which mainly occurs in the segment joints, was often ignored in the relevant studies of TBM tunnelling. Additionally, the geological models in these studies were simplified to different extents, and mostly were simplified as homogenous bodies. Considering the deficiencies above, a 3D refined model of the surrounding rock of a tunnel is firstly established using NURBS-TIN-BReP hybrid data structure in this paper. Then the seepage field of the surrounding rock considering the leakage in the segment joints is simulated. Finally, the stability of TBM water diversion tunnel is studied coupled with the seepage simulation, to analyze the stress-strain conditions, the axial force and the bending moment of tunnel segment considering the leakage in the segment joints. The results illustrate that the maximum radial displacement, the minimum principal stress, the maximum principal stress and the axial force of segment lining considering the seepage effect are all larger than those disregarding the seepage effect.     

基础教育新型师生关系建构简论

建构新型师生关系在我国新一轮基础教育课程改革中具有重要价值，应明确新型师生关系的内涵及理论根据，采取得力措施促进新型师生关系的建构。     

浅谈高职院校中的现代教育技术应用

现代教育技术以其信息的实用性、多样性、开放性、多媒体技术的交互性等优势在高职院校中得以应用和发展,并且极大地推动了高职院校教育教学改革。本文从在高职院校中应用现代教育技术的意义和作用出发,说明在高职院校中大力发展现代教育技术的必要性及其发展中的应对措施。     

论联合办学与高等教育管理体制改革的关系

联合办学有助于淡化我国高校单一的隶属关系 ,不失为当前高等教育体制改革比较现实可行的路。但联合办学只能在一定时期和一定程度上对宏观管理体制改革起促进作用 ,根本上还是要建立政府宏观调控、社会积极参与、学校自主办学的运行机制。各种形式的联合办学都会给高校的内部管理带来新的课题 ,这就为高校的内部管理体制改革提供了契机     

高校学生奖励机制激活的新视域

高校学生奖励机制是一项复杂的工程,在精英教育向大众教育的转变的过程中,我国高校学生奖励机制应避免高校学生奖励过程中一味沿袭和抄袭现象,树立起科学的奖励观,拓展高校学生奖励的新视域,构建以人为本的高校学生的奖励机制,从而全面激活高校学生的管理工作。     

日本强筑安奉铁路始末

20世纪初,日本在我国东北发动了攫夺铁路权益的狂潮,安奉铁路便是日本强行修建的许多铁路中的一条1904-1905年,日本出于日俄战争的需要,修筑了安奉军用窄轨铁路.其后,为了进一步加紧对中国的侵略.日本于1909-1911年强行将安奉窄轨铁路改筑为标准的宽轨铁路.     

基础教育教学改革论坛

为创建适合中国国情的创造性教育模式,从学习科学的角度出发,必须突破大、中、小学的界限,本刊组织从事包括基础教育教学工作者在内的同仁研究讨论中国创新教育中亟待解决的问题。