高频火花试验机的计量特性分析及校准装置研究

本文根据国内外标准的要求对高频火花机的计量特性进行分析,并根据高频火花试验机的计量特性提出了研制高频火花试验机校准装置的技术原理,将为解决高频火花试验机校准的难题提供一种方案,对推动火花试验机国家计量技术规范的出台和提升电线电缆的产品质量提升起到积极的作用。     

立体停车设备行业蓬勃发展 自动化厂商需密切关注

机械式停车设备行业在我国是近十几年来发展起来的新兴行业。随着我国人民生活的不断提高和汽车工业的高速发展,机械式停车设备以其独有的优越性,最近几年得到了广泛的应用。受宏观经济影响,增长速度有大幅下滑,但有一定的增长。据统计,2008年内进行安装的机械式停车库达到687个,比2007年的652个增加了35个,增长了5．37％。2008年在中国整体外贸出口增速大幅下滑的情况下,立体停车设备出口额增长仍达到了68．1％的增速。     

称重传感器蠕变补偿的RBF网络模型

称重传感器的蠕变是影响精度的主要因素之一。针对传感器蠕变的实时性与非线性,建立了称重传感器蠕变补偿的RBF网络模型。设计硬件采集电路并采用低功耗处理器对传感器数据进行软件补偿。仿真结果表明,RBF神经网络具有很强的逼近非线性函数和自学习能力,能够对称重传感器的蠕变误差进行修正。补偿后的蠕变误差减小至0.005%以内,补偿效果明显。     

基于MMA7660加速度传感器的老人跌倒检测装置

目前,跌倒检测所用的关键部位分为机械式和电子式两种。机械式则是通过一个倾斜角度开关,当开关处于某一倾斜角度时,开关会自动接触闭合产生一个脉冲,内部处理器通过判断脉冲来判断是否倾斜达到判断跌倒与否,但这一脉冲的不稳定性造成了机械式的准确性和灵敏度很低的缺点,而且国内的倾斜开关的倾斜角度很难满足真正的老人跌倒检测。而电子式基于传感器的则可以尽量避免此种缺陷。     

环氧模塑封装材料的蠕变损伤研究

文章对环氧模塑封装材料（EMC）的蠕变损伤进行了实验研究,对断口进行了扫描电镜观察,获取了EMC材料蠕变失效的微观机理。应用修正的Lermaitre蠕变损伤模型来描述损伤参数及预测蠕变损伤寿命。实验结果表明：EMC材料的蠕变具有明显的蠕变演化的三个阶段;颗粒与基质间的界面脱层和微空洞相互间的级联扩张是引发试样蠕变断裂失效的根本原因;由蠕变损伤模型预测的蠕变寿命在应力水平较低的情况下与实验吻合较好。     

单片机在单纤维电子强力仪中的应用

针对目前美、日、欧洲等国的电子强力仪大部分为通用的材料试验机，而专门用于单纤维测试的产品不多，且这些产品所提供的信息量较少，将单片计算机应用到单纤维电子强力中，使单根纤维的一次拉伸，伸长弹性，负荷弹性，定伸长反复拉伸，递增定负荷反复拉伸，松驰及蠕变等各项性能的测试过程自动完成且能对各项性能指标进行统计运算并自动输出打印。     

轮式移动教育机器人避障方法的研究

对一种轮式移动教育机器人进行了研究,在实验中采用传统的红外传感器使机器人具有避障功能,另外使用新颖的机械式胡须对机器人进行避障设计,达到了预期的避障效果。以胡须避障为例,讨论并解决了避障过程中的卡死问题,并给出了利用BASIC语言编写控制程序的方法。     

镍基单晶高温合金孔洞区域蠕变行为原位SEM研究

本文采用扫描电镜(SEM)原位高温蠕变实验研究方法,在780℃/720 MPa的蠕变条件下,对镍基单晶高温合金开展蠕变实验,实时观察了孔洞区域显微组织原位演化过程。实验结果表明：蠕变开始后孔洞处应力集中,变形集中于孔洞区域,孔洞旁产生45°及135°方向以及垂直于应力轴的裂纹,多个孔洞共同作用可引起颈缩。颈缩发生后真实应力增加,促进颈缩区孔洞处裂纹垂直于应力轴扩展,而非颈缩区裂纹在切应力作用下沿45°以及135°方向发生扩展。此外蠕变第一阶段已经发生颈缩,导致第二以及第三阶段时间较短,缩短蠕变寿命。揭示了高温下孔洞缺陷对蠕变行为的影响规律及机制,对蠕变寿命预测及高温合金研发有一定启发意义。     

2.25Cr-1Mo钢中M23C6碳化物的析出位向关系

低合金耐热钢主要通过钢的合金化和适当的热处理,达到强化固溶体、强化晶界及沉淀强化的目的,从而提高钢的高温性能.2.25Cr-1Mo钢中弥散析出的碳化物对位错的移动具有阻碍作用,尤其是碳化物以一定的位向关系从基体中析出时,这种作用更加明显,可以有效地提高材料的蠕变抗力.因而,研究碳化物析出转变的位向关系,对于弄清材料的蠕变机制具有重要意义.     

AD7705在万能试验机数据采集中的应用

针对目前低档液压式万能试验机存在的问题,结合试验站的实际情况,设计采用计算机集中管理分散控制模式的技术改造方案。该方案使低档液压万能试验机实现了试验数据采集及控制的自动化,实践证明该系统的测量精度达到±0.5%FS,完全满足国家对试验机检定的技术标准(测量精度±1%FS)要求。结合AD7705在万能试验机数据采集中的应用,详细介绍了AD7705与MCS-51系列单片机的硬件接口设计和软件设计中应注意的问题,给出单片机对AD7705实现读、写操作的源程序。本测控系统采用集散控制技术,充分利用系统的硬件资源;数据采集采用双通道A/D转换器AD7705,简化了常规的信号调理环节,提高了系统的可靠性。     

Resolution Enhancement Technology:Integrated Process Solutions using OPC

DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system.     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Study of waveguide coupling efficiency in hybrid silicon lasers

This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel＇s.     

Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers

A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working.     

A rigorous proof of MIMO channel capacity’s increase with antenna number

It is well known that adding more antennas at the transmitter or at the receiver may offer larger channel capacity in the multiple-input multiple-output（MIMO） communication systems. In this letter, a simple proof is presented for the fact that the channel capacity increases with an increase in the number of receiving antennas. The proof is based on the famous capacity formula of Foschini and Gans with matrix theory.     

Call for Papers

正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks