THEORY OF DIELECTRIC ELASTOMERS

In response to a stimulus, a soft material deforms, and the deformation provides a function. We call such a material a soft active material （SAM）. This review focuses on one class of soft active materials： dielectric elastomers. When a membrane of a dielectric elastomer is subject to a voltage through its thickness, the membrane reduces thickness and expands area, possibly straining over 100%. The dielectric elastomers are being developed as transducers for broad applications, including soft robots, adaptive optics, Braille displays, and electric generators. This paper reviews the theory of dielectric elastomers, developed within continuum mechanics and thermodynamics, and motivated by molecular pictures and empirical observations. The theory couples large deformation and electric potential, and describes nonlinear and nonequilibrium behavior, such as electromechanical instability and viscoelasticity. The theory enables the finite element method to simulate transducers of realistic configurations, predicts the efficiency of electromechanical energy conversion, and suggests alternative routes to achieve giant voltage-induced deformation. It is hoped that the theory will aid in the creation of materials and devices.     

捕获更多能量的热电子换能器

一种能从太阳辐射中吸取热量和光线的设备。 来源：《光子增强热电子发射太阳能集中系统》 贾里德·W·斯奎德等《自然材料》9：762767 结果：由斯坦福大学的研究人员研制的一种设备能把太阳辐射中的光和热都转化为电流。     

BWA系统中判决反馈均衡器的ASIC实现

随着集成电路日新月异的发展,体积和功耗以及实时性要求已经成为衡量集成电路好坏的重要指标.为了克服采用多片通用集成电路实现时,体积和功耗比较大,以及采用DSP实现时不能很好满足实时性的要求,本文针对无线宽带高速数据通信对实时性要求比较高的特点,采用SoC设计的方法,对BWA系统中判决反馈均衡器进行了ASIC实现.通过采用ASIC的实现方法,以及自顶向下的模块设计方法,很好地满足了下一代无线通信判决反馈均衡器对实时性要求,同时也满足了功耗和性能的要求.     

Energy dissipation of a ring-like metal rubber isolator

Metal rubber （MR） is a kind of homogeneous poroelastic damping material made of metal wire. In this paper, by ana- lyzing the forces on the MR isolator and the MR element, the hysteresis loops of the force and deformation are studied and verified by experiments. The results show that the force and displacement hysteresis loop of the MR isolator is described by the force and deformation hysteresis loops of the MR elements. In addition, the relationship between the energy dissipation coefficient of the MR element and that of the MR isolator is derived. The energy dissipation coefficient is programmed and calculated by MATLAB using experimental data, and the results are compared with the theoretical value. It is the basis for the design and applied research of the MR isolator in a future study.     

Energy spectrum of multi-radiation of X-rays in a low energy Mather-type plasma focus device

The multi-radiation of X-rays was investigated with special attention to their energy spectrum in a Mather-type plasma focus device （operated with argon gas）. The analysis is based on the effect of anomalous resistances. To study the energy spectrum, a four-channel diode X-ray spectrometer was used along with a special set of filters. The filters were suitable for detection of medium range X-rays as well as hard X-rays with energy exceeding 30 keV. The results indicate that the anomalous resistivity effect during the post pinch phase may cause multi-radiation of X-rays with a total duration of 300 ± 50 ns. The significant contribution of Cu-Kα was due to the medium range X-rays, nonetheless, hard X-rays with energies greater than 15 keV also participate in the process. The total emitted X-ray energy in the forms of Cu-K and Cu-K/3 was around 0.14 ± 0.02 （J/Sr） and 0.04 ±0.01 （J/Sr）, respectively. The total energy of the emitted hard X-ray （〉 15 keV） was around 0.12± 0.02 （J/Sr）.     

无线网络能量优化及数据通信的分析

随着时代发展,无线网络如今面临两大主要问题,包括传感器节点的能量消耗和数据通信的问题.为了促进无线网络的良性发展,有必要对上述两种影响因素进行研究,有效的对其进行合理控制,提升其效率.以BSN和WiFi无线网络为例,对无线网络能量优化及数据通信进行分析和研究.     

变压器：LAN用小型SMD脉冲变压器的开发与量产

行业最小尺寸3．2mm×3．2mm×2．8mm。与以往产品相比体积和封装面积分别减小30％凭借自动卷线工法，实现质量稳定。     

小问题 大作用

习题教学是课堂教学的重要组成部分，机械式的习题教学满足于较对答案，套题型，将学生的思维引向生搬硬套；开放性的习题教学能启迪学生的思维，引导学生们从不同角度出发推敲问题（横看成岭侧成峰），从解题错误出发拷打问题（柳暗花明又一村），从联想引申出发生成问题（绿叶成阴子满枝）．一些不起眼的小问题在教师的精心设计下能释放大能量，起到大作用，有效提升学生的思维水平．