EDS UNIGRAPHICS V10．4

ＥＤＳＵＮＩＧＲＡＰＨＩＣＳＶ１０．４最新版本ＵＧＶ１０．４是目前最全面的ＣＡＤ／ＣＡＥ／ＣＡＭ系统．拥有４０多个应用软件，并能在各种平台上运行，如ＨＰ７００系列、ＶＡＸ和ＡＸＰ系列、ＳＧＩ、ＳＵＮ和ＩＢＭＲＳ／６００系列的各种机器。与老版本相比，１...     

OSI／MMS系统中ASN.1编／解码器的设计与实现

ＡＳＮ．１是一种标准的抽象语法定义描述语言，它提供了定义复杂数据类型以及确定这些数据类型值的方法，许多ＯＳＩ应用协议标准都采用ＡＳＮ．１作为数据结构定义描述工具，尤其用来定义各各应用协议数据单元的结构。本文首先介绍ＡＳＮ．１数据类型和基本编码规则，接着详细讨论ＭＭＳ通信系统中ＡＳＮ．１编／解码器的设计与实现，此编／解码器用于ＭＭＳ协议数据单元的ＡＳＮ．１抽象语法和传送语法之间的转换，以实现ＭＭＳ在     

SOPHO—SET和LAM的功能与结构分析

在ＳＯＰＨＯ－Ｓ中，数字话机ＳＯＰＨＯ－ＳＨＴ和数据终端适配器ＬＡＭ是两种可连接数据设备的重要部件。本文着重介绍了它们的功能，并对其结构进行了分析。     

AT＆T Paradyne开发出世界上最快的调制解调器

ＡＴ＆ＴＰａｒａｄｙｎｅ开发出世界上最快的调制解调器ＡＴ＆ＴＰａｒａｄｙｎｅ已开发出世界上最快的调制解调器，其传输速率比目前市场上最快的商用调制解调器几乎快６０００字／分。新的ＣＯＭＳＰＨＥＲＥ３８００Ｐ和ＣＯＭＳＰＨＥＲＥ３９００调制解调器都将达到...     

固体接触型玻璃pH电极的研制

本文采用银导电胶和银丝代替常规ＰＨ玻璃电极的内溶液和内参比。制作固体接触型ＰＨ电极。制作的电极在２－１２ｐＨ范围内呈良好的Ｎｅｒｎｓｔ响应电极的斜率为５８．１ｍＶ／ｐＨ同时还测定了响应时间、温度性能曲线，对实验结果进行了讨论。     

SCB—1单片单板机使用中的问题及改进

ＳＣＢ—１单片单板机使用中的问题及改进刘丽莉，万春ＳＣＢ—１单片板机系统软、硬件结构简洁透明，拥有很多用户．但在使用过程中，有时会出现下述莫明其妙的错误．做如下简单的数据传送实验：把８０３１内部ＲＡＭ３０Ｈ～３ＦＨ置初值ＡＯＨ～ＡＰＨ，然后把３０Ｈ～...     

基于Telnet协议和Clinet／Manager／Server结构综合的信息检索…

本文提出了综合Ｔｅｌｎｅｔ协议和Ｃｌｉｅｎｔ／Ｍａｎａｇｅｒ／Ｓｅｒｖｅｒ结构的网络服务模型；在基于Ｃｌｉｅｎｔ／Ｓｅｒｖｅｒ结构的ＲＤＢＭＳＳＹＢＡＳＥ基础上实现了Ｔｅｎｅｔ协议和Ｃｌｉｅｎｔ／ｍａｎａｇｅｒ／Ｓｅｒｖｅｒ结构综合的图书馆信息检索应用系统，构造了图书馆网络信息服务系统的Ｃｌｉｅｎｔ／Ｍａｎａｇｅｒ／Ｓｅｒｖｅｒ．     

技术转让

技术转让特殊处理气瓶及其配套件ＣＬ－１型特殊处理气瓶系列选用一号氟树脂进行内涂。气瓶内壁涂层光洁、配伍性广，具有憎水、化学惰性、保纯、抗腐蚀等特点，其耐压为１４．７ＭＰａ，耐热小于１２０℃，耐低温－１９６℃，适用于ＳｉＨ４／Ｎ２、Ｂ２Ｈ６／Ｎ２、ＰＨ...     

基于客户／服务器模型的CIMS集成软件平台的研究

基于客户／服务器模型的ＣＩＭＳ集成软件平台的研究金尊和，吴澄（清华大学自动化系，国家ＣＩＭＳ工程研究中心·北京，１０００８４）１ＣＩＭＳ与集成软件平台１．１ＣＩＭＳ软件危机ＣＩＭＳ集成不仅是各种自动化设备的物理集成，更是管理、设计和生产等各子系统的信...     

SOPHO—S250／1000系统的硬件,软件结构分析

ＳＯＰＨＯ－Ｓ２５０和ＳＯＰＨＯ－Ｓ１０００是ＳＯＰＨＯ－Ｓ系列中的一对“孪生儿”，是趋于小型或中型容量的事务通信系统。其硬件是以ＳＯＰＨＯ－Ｓ２５００为基础设计的，软件则大量地使用了ＴＢＸ系列中已开发成功的软件。本文首先重点分析了ＳＯＰＨＯ－Ｓ２５０／１０００系统的硬件、模块组成、控制结构及其交换网络结构，并与ＳＯＰＨＯ－Ｓ２５００系统作了比较；接着介绍了其软件模块组成，并分析了有关模块的生成过     

依缓冲库调速CIMS可靠性分析的位相结构方法

本文提出了依缓冲库调速ＣＩＭＳ可靠性分析的位相结构方法，从闭环排队网络出发，利用准生灭过程理论，给出了系统的各种可靠性指标和生产指标，讨论了系统局部运行期的们相特征，最后给出了两个数据算例。     

具有相型寿命的Clarke型CIMS生产线可靠性研究

详细地研究了具有位相型寿命,带有两类不同柔性机制的有限缓冲库的Clarke型 CIMS生产线的可靠性问题.首先给出了各个工件广义加工时间相型结构的递变规律,其次 在平稳状态下利用二维标值闭环网络理论,给出了系统的主要稳态生产指标和可靠性指标的 算法公式.最后讨论了系统对参数组摄动时的灵敏界.     

全光纤白光干涉型光纤传感器

根据传统光学干涉原理研制出的相应调制型光纤传感器,其突出优点是灵敏度高。但却只能进行相对测量,即只能用作变化量的测量,而不能用于状态量的测量。因此,本文介绍了能实现绝对测量的全光纤白光干涉型光纤传感器及其检测技术,该技术基于白光干涉的绝对测量原理。     

Pairwise quantum correlations of a three-qubit XY chain with phase decoherence

Quantum correlations, including entanglement and discord with its geometric measure in a three-qubit Heisenberg XY chain, with phase decoherence, are investigated when a nonuniform magnetic field is applied. When the qubits are initially in an unentangled state, the nearest neighbor pairwise correlations are destroyed by phase decoherence, but stationary correlations appear for next-to-neighbor qubits. With an inhomogeneous magnetic field, the stationary correlations appear for nearest neighbor qubits and they disappear for next-to-nearest neighbor qubits. But when the qubits are initially in an entangled state, an inhomogeneous magnetic field can enhance the stationary correlations of next-to-neighbor qubits, but it cannot do so for nearest neighbor qubits. The decoherence effect on stationary correlations is much stronger for next-to-nearest neighbor qubits than it is for nearest neighbor qubits. Finally, a uniform magnetic field can affect the correlations when the qubits are initially in an entangled state, but it cannot affect them when the qubits are initially in an unentangled state.     

Singularly perturbed systems of diffusion type and feedback control

Asymptotic approximations describing the behaviour of linear systems of diffusion type (convective or non-convective) with a small diffusivity, to which a feedback control of distributed or boundary type based on point sensors is applied, are constructed and proven to be correct. As a consequence one can find a near-optimal feedback control for a cost minimization problem with a quadratic performance index measuring the deviation of the stationary state from an ideal state, under the restriction of a prescribed exponential degree of stability of the stationary state.     

GPS接收通道性能分析

对于一般用户来说,GPS的动态应用是非常熟悉的,同样的,一个GPS接收机也是一个动态测量系统,然而直到现在,一个GPS接收机的基本观测量(码和载波相位)在处理时,或多或少被当作带有白噪声输入的固定随机偏差过程。文章通过应用动态系统的方法来看待GPS接收机的误差特性,利用一种线型动态空间误差模型针对GPS接收机相关接收中产生的主要误差进行了分析,从而较好地解决了实际经验与理论之间的差异。     

Computational uses of the method of phases in the theory of queues

A probability density {p_k} on the positive integers is of phase type, if it is the probability density of the time till absorption in an (m + l)-state Markov chain with one absorbing state m + 1, and m transient states all of which lead to the absorbing state. If the service times in a discrete time queue have densities of phase type, several transient and stationary probability distributions of interest may be computed by highly efficient algorithms, which are presented in the paper.     

Glass transition and the replica symmetry breaking in vortex matter: MC study

We investigate effects of disorder and thermal fluctuations on the Abrikosov state of type II superconductors applying the Monte Carlo method to Ginzburg–Landau theory to confirm earlier replica calculation. The vortex phase diagram has two transition lines, the melting line and the vortex glass transition lines in both crystalline and homogeneous states. The glass line is always a continuous transition, while the melting line is the first order.     

Dynamic routing in reentrant flexible manufacturing systems

Consider a flexible manufacturing system (FMS), with several parallel production lines. Each line is statistically balanced. Due to process time and yield variations, some workstations may be temporarily starved of parts during the FMS operation, while others may have too many. The purpose of the dynamic routing algorithm described here is to achieve real-time load balancing in a stochastic processing environment and thus to increase the performance of the system in throughput, workload balance and reduced work-in-process queues. We formulate the problem and develop an optimal stationary policy (for two lines that have a material handling transport between them) based on the input buffer state of each station.     

The Shock-Wave Structure in a Gas−Particle Mixture with Chaotic Pressure

We consider the propagation of a shock wave in a mixture of a gas and fine solid particles with allowance for the difference in their velocities and the availability of the proper pressure of the phase of particles; here, equations of the Anderson type and others are used. We propose an approximate mathematical model of the flow; in this model, the dependence of the pressure of the first (gaseous) phase from the particles’ volume-concentration can be ignored, but the terms that present the phase volume-concentration multiplied by the pressure gradient of the gas are taken into account. It turns out that with this representation of the equation of state, the mathematical model has the hyperbolic type. For this system of equations of mechanics of heterogeneous media, we carry out the classification of the types of shock waves implemented in the considered mixture. The presented statements about the types are illustrated by numerical computations in stationary and nonstationary formulations; for this purpose, the numerical method of the TVD type is developed.