组扩展编码在测试数据压缩中的应用

为了减少SoC芯片的测试数据,提出了一种基于组扩展编码的测试数据压缩方案。该方案采用变长到变长的编码方式对任意长度的0游程和1游程编码,代码字由标记位、前缀和尾部组成。组扩展码将每组的容量扩大了一倍,能有效压缩芯片测试数据量。理论分析和实验结果表明组扩展编码能取得很好的压缩效果,而且能够更好地适应于不同的测试电路。     

600 MW汽轮机差胀变化规律及控制

介绍ＧＥＣＡＬＳＴＨＯＭ６００ＭＷ汽轮机启停、正常运行中的差胀变化规律以及影响差胀的变化因素,总结了控制差胀变化的经验。     

千兆网络的组建[4] 李宇春，等.停炉保护缓蚀剂开发研究方法探[D].长沙电力学院学报.1998，

根据应用要求,通过对比分析,选择了千兆以太技术来构建企业局域网,并介绍了具体组网方案来保护网络的冗余性,可靠性,可扩展性及安全性。     

Langmuir Probe Measurements in the Gaseous Electronics Conference RF Reference Cell

The use of a Langmuir probe system in two GEC cells is reviewed. The major problems associated with probe diagnostics in a GEC cell are outlined and discussed. While the data base is still insufficient to give definitive values for many parameters, a number of standard measurements are put forward. The plasma density in argon is 9×10⁹ cm⁻³ (±20 %) at an applied rf voltage of 250 V (500 V peak to peak) and a gas pressure of 13.3 Pa (100 mTorr). The electron density scales linearly with applied voltage. The plasma to ground sheath resistance is shown to be very important with a value of 810 Ω in argon at a pressure of 13.3 Pa (100 mTorr) and discharge current of 0.1 A. The value of plasma to ground resistance scales inversely with discharge current and sublinear with pressure. Two standard features in the electron energy distribution function (EEDF) have been proposed as a test of the ability of a probe system to resolve features, first, the transition from a low temperature (<1 eV) bi-Maxwellian distribution to a Druyveysten distribution (3 eV) at 13.3 Pa (100 mTorr) in argon, and the “hole” in the EEDF at 2 eV to 4 eV in nitrogen plasmas.     

FROM THE ARCHIVES WHAT THE SINKOV MISSION BROUGHT TO BLETCHLEY PARK

This article lists the items brought by the Sinkov Mission to the Government Code and Cypher School, Bletchley Park, in early 1941.     

Numerical modelling and validation of geosynthetic encased columns in soft soils with installation effect

If the bearing capacity of the soil is not sufficient an improvement method has to be considered. In case of soft and cohesive soils the vibroreplacement technique can be used. This paper describes the numerical simulation of a group of encased granular columns under an embankment based on a real life project situated to the north of Hamburg, Germany. The soft soil creep model and the hardening soil model were used to model the behaviour of the soft clay and granular material respectively. The material parameters were determined based on laboratory tests conducted on test samples from the field. The installation effect of columns in numerically modelled based on the cavity expansion method in a 2D axis symmetric model. The results of the installation effect in terms of stress state changes in the soft soil after complete consolidation are then imported to the 3D model involving group of columns. The results of the numerical simulations are validated against field measurement data in form of vertical settlement of the ground at various locations with respect to time and horizontal deformations in the encased columns with depth.     

Seismic behavior of geosynthetic encased columns and ordinary stone columns

This study is concerned with evaluating and comparing the behavior of geosynthetic encased stone columns (GECs) and ordinary (conventional) stone columns (OSCs) during and after seismic excitations. For this purpose, well instrumented GECs and OSCs are installed in kaolinite clay beds consolidated in a large steel tank. In order to simulate the seismic behavior of columns supporting an embankment, surcharge loads are applied and the experimental setup is subjected to large-scale shaking table tests. The strains in the encasement are measured by making use of water-proof strain gauges during the course of the experiments. The vertical load capacities of GECs and OSCs after the seismic excitation were measured by a series of stress controlled column load tests. The experimental data at hand suggests that under the action of seismic loads there is a significant strain demand on the encasement confining the GECs. An almost linear relationship between the seismic energy input expressed in terms of IA (Arias Intensity) and reinforcement strain amplitude is observed. GECs in general have exhibited a superior performance both under static and seismic loads when compared to OSCs.     

Coding graphene metasurface modeling using MoM‐GEC method for dynamic diffusion and scattering control at Terahertz range

In this article, we present an electromagnetic study of electrically programmable graphene‐based metasurface with individual scattering control. Our investigation is based on the method of moments combined with the generalized equivalent circuit (MoM‐GEC) approach. We show that, tuning the unit cell's conductivity leads to change its input impedance and scattering matrix. So, each unit cell of the metasurface exhibits' a dynamic phase response that can be switched between 0° and ?180° by controlling high transmission and total reflection states. Based on this feature, a 1‐bit coding metasurface consisting of discrete codes of “0” and “1” is used to synthesis 3D beams. Hence, tailorable anomalous reflection and diffusion are studied under normal incidence at a fixed frequency of 3.9 THz. This survey opens new opportunities in the domain of Terahertz beam engineering and security scanner applications.     

GEC在远程监控中的应用

GEC(General Embedded Controller,泛用型嵌入式控制器)是构建于PC-based架构的嵌入式控制系统,提供一般工业控制应用所需的软硬件系统和控制逻辑程序的执行能力。本文介绍了泛用型嵌入式控制器(GEC)的系统构架,包括硬件和软件系统,并籍由一个应用实例——台湾地区隧道远程监控系统介绍了使用凌华科技GEC控制器GEME-1000和NuDAM-6000对隧道内空气品质进行监控调节的方案。