Analysis of the atomic force microscopy vibration behavior using the Timoshenko theory by multi‐scale method in the air environment

This article deals with the modeling and simulation of the vibration behavior of piezoelectric micro‐cantilever (MC) based on the Timoshenko theory and using multi‐scale (MTS) method in the air environment. In this regard, the results are compared with the previous literature, such as the finite element method and the MTS method. The analysis of the piezoelectric MC vibrating behavior is investigated in a dynamical mode including non‐contact and tapping modes. The dynamics of this system is affected by interferential forces between probe tip and sample surface, such as van der Waals, capillary, and contact forces. According to the results, the forces applied to the probe tip reduce the amplitude and the resonance frequency. The simulation of surface topography in non‐contact mode and tapping for rectangular and wedge‐shaped roughness in the air environment are presented. Various experiments have been conducted in Ara research Company using the atomic force microscopy device in the amplitude mode. In the NSC15 Cantilever, the first natural frequency is derived from the results of the MC simulation based on Timoshenko beam theory, the practical results are 295.85 and 296.12 kHz, and the error rate is 0.09; at higher natural frequencies, the error rate has been increased. The γ _f coefficient is a measure of the nonlinear effects on the system; the effect of the piezoelectric length and width on γ _f coefficient is also investigated.     

多路控制的馈能减振器的设计及实验

针对传统液压式减振器浪费车辆振动能和阻尼不可调的两个缺点,提出1种多路控制的馈能减振器。该馈能减振器包含6个发电机,通过单独控制6个发电机的电路通断及调节电路的负载,控制减振器的阻尼参数,同时收集车辆行驶的振动能。Simulink仿真结果表明,该减振器能够提供不同级别的阻尼力。使用MTS实验平台对减振器样机进行实验,实验结果表明,多路控制的馈能减振器的减振性能符合Simulink仿真结果,同时能够有效地收集振动能。     

用Delphi 5开发高效率的分布式应用系统——提高分布式应用系统效率的几种方法

本文总结出用Delphi5开发多层分布式应用系统时，通过优化数据库存取的设定，使用有效率的远程调用方式，调整应用程序服务器的执行效率和控制网络流量等来提高分布式应用系统效率的方法。     

电子商务竞争模拟系统的设计与实现

目前我国许多高校开设了电子商务课程,但由于电子商务的应用性强,只是传统的枯燥的授课方式很难让学生真正的了解电子商务的运行机理,为此文章介绍了电子商务企业竞争模拟系统的设计思路和开发技术。该系统以制造企业为主体,抽象出普遍的电子商务框架模型,模拟企业供、产、销一体化的新型电子商务供应链管理活动的实际完整过程,使学生能够在积极参与企业竞争的过程中,真正的掌握电子商务的机理和本质。     

基于MTS的三层结构的研究与实现

针对MTS（Microsoft Transaction Server)在保险信息系统中的应用，分析了MTS的体系结构以及特点，重点体现MTS强大的分布事物支持、安全管理、资源管理及多线程并发控制的特性。     

基于三层结构的MIS系统在ERP系统的应用

随着Internet技术的广泛应用及信息技术的迅速发展,MIS系统已经从传统的C/S结构向多层结构转变,本文以微软的MTS为例,对基于MTS的C/S结构的技术做了详细的阐述和探讨.     

基于Delphi的电子商务系统的结构的比较与研究

本文分析了利用Delphi开发电子商务系统的技术,重点分析和比较了两种基于Delphi技术的电子商务的结构。     

基于Delphi的电子商务系统的结构的比较与研究

本文分析了利用Delphi开发电子商务系统的技术,重点分析和比较了两种基于Delphi技术的电子商务的结构.     

Experimental study on critical breakage stress of float glass with different thicknesses under conditions with temperatures of 25 and 200°C

The objective of this study is to directly measure the critical breakage stress for glass through mechanical tensile experiments based on MTS 810 apparatus. Two series of experiments were, respectively, conducted under the condition with a room temperature (25°C) and a hot environment (200°C) for float glass. The results show that the critical breakage stresses of 6, 8, 10 and 12 mm float glass are, respectively, 74, 127, 158 and 198% larger than that of 4 mm float glass under the condition with a room temperature (25°C). Similarly, the critical breakage stresses of 6, 10 and 12 mm float glass are, respectively, 29, 72 and 93% larger than 4 mm glass in the hot environment (200°C). In addition, through the comparison between the two series of experiments, it suggests that the critical breakage stresses of 6, 8, 10 and 12 mm thick float glass in a hot environment are, respectively, 7, 48, 16 and 19% smaller than that in a room temperature. It is suggested that the measured critical breakage stress of float glass here is relatively smaller than those in the previous measurements. Copyright © 2010 John Wiley & Sons, Ltd.     

管理信息系统及其开发方法探讨

本文给出了管理信息系统MIS的定义及一般结构．分析了管理信息系统的特性及其与当前所用开发方法的关系．提出了统畴化开发管理信息系统的思想．