应急通信保障情况综合处理平台研究

应急通信保障情况综合处理是应急指挥调度的重要内容。说明了应急通信保障情况的定义,分析了应急通信保障情况综合处理的流程,给出了应急通信情况综合处理平台的技术体系结构,分析了异构系统集成、异构数据源集成、订阅分发、基于模板的情况定制等关键技术,实现了一个应急通信保障情况综合处理平台的原型系统,初步验证了关键技术解决方案的合理性和有效性。     

3G移动通信技术专题——平稳发展中的3G移动通信

介绍了2004年3G在全球的发展情况，包括用户增长情况和商用网络的增加情况，分析了3G不同技术商用化的特点和面临的重要问题，并对我国3G技术试验目前的进展情况作了介绍。     

平稳发展中的3G移动通信

介绍了2004年3G在全球的发展情况,包括用户增长情况和商用网络的增加情况,分析了 3G不同技术商用化的特点和面,临的重要问题,并对我国3G技术试验目前的进展情况作了介绍。     

无线接入技术的发展及标准化情况

对我国宽带无线接入的频率资源分配情况及几种无线接入技术的发展情况进行了介绍,并概述了宽带无线接入技术的标准化情况。     

深圳商业楼宇宽带市场调研报告

通过对深圳市商业楼宇情况的深入调查了解,本文分析了深圳市商业楼宇情况的宽带运营市场情况,提出了网络覆盖策略和经营策略的建议。     

某电厂1056t/h锅炉屏式再热器频繁泄漏原因分析与对策

本文针对某电厂1056 t/h锅炉屏式再热器频繁泄漏问题,对屏式过热器在该厂的布置情况进行了介绍,对每次泄漏情况进行了详细的阐述以及每次泄漏后的原因进行了分析,并对处理情况进行了简要的说明,总结了泄露后的纠正情况。     

电视监控和报警系统

文章介绍了中型城市电信局监控、报警系统的设计安装情况，分析了系统性能特点，给出了主要设奋的技术指标，讲解了系统软件情况，还简单介绍了监控报警系统的实际应用情况。     

HSDPA——把3G推向3．5G

本文简述了HSDPA的技术情况，并着重阐述了HSDPA的关键技术，最后介绍了HSDPA的商业化进展情况。     

我国数字电视(DTV)机卡分离的现状分析

分析了实现机卡分离的意义，描述了国外机卡分离实现情况，概述了我国机卡分离技术发展现状以及相应标准的制定情况。     

Femtocell网络及其挑战分析

文章首先介绍了Femtocell的特点、标准现状、产品情况、应用情况，还简要分析了Femtocell网管系统的相关情况，并对Femtocell网络管理存在的问题进行了分析，同时提出了解决方案，最后提供了Femtocell网络管理的发展思路。     

Application of model of mixture of probabilistic distributions for definition of the signals of radiophysical probing

The article describes a model representation of radar probing data in form of a mixture of background and target samples, which is the sum of two random variables with very different parameters. For model development we research the behavior of the central moments of the distribution mix without assuming the distribution law form. An example it is described the detection of the signal at the output of compression system of chirp ionosonde.     

Interpretation of responses of visual cells of limulus

Assuming that visual responses are due to the action of particles on the membrane of the visual cells, the stochastic variability of the response should be a function of the number of particles producing it. Quantitative predictions can be made with the aid of a model proposed in previous articles. It is found that responses produced in visual cells of Limulus by absorption of a single photon have the stochastic properties which would be expected if the response to one photon were brought about by 25 particles. It is concluded from this that the processes leading to visual responses produce multiplication of particles. The effects of temperature and of metabolic poisons suggest that these processes are of chemical nature.     

Differential method of analysis of luminescence spectra of semiconductors

A method for analyzing the luminescence spectra of semiconductors is suggested. The method is based on differentiation of the spectra. The potentialities of the method are demonstrated for luminescence in the region of the fundamental absorption edge of Si and SiGe alloy single crystals. The method is superior in accuracy to previously known luminescence methods of determining the band gap of indirect-gap semiconductors and practically insensitive to different conditions of outputting radiation from the sample.     

“计算机组成原理”设计性实践教学模式研究

本文阐述了"计算机组成原理"设计性实验教学的重要性,对设计性实验教学的目的和基本特征进行了归纳,对"计算机组成原理"设计性实验教学的现状进行了调查,对存在的问题进行了较深入的分析;在此基础上.对组成原理设计性实验的教学模式进行了研究,对设计性实验的体系进行了初步设计,并对"计算机组成原理"设计性实验的实施方法进行了探讨.     

近红外光谱技术在水果品质无损检测中应用的研究与现状

简单概述了我国水果产业的发展现状,着重阐述了国内外利用近红外光谱技术进行水果品质无损检测的最新研究进展,分析了当今研究中存在的问题,并对利用近红外光谱技术进行水果检测的前景进行了展望,提出了一些建议。     

星载差分吸收光谱仪转动部件测试系统设计

基于星载差分吸收光谱仪转动部件控制需求,设计了星载光谱仪转动部件的测试系统。采用微动开关复位加定步的电机运动方式实现电机的精确定位。采用脉冲调制（PWM）的方式实现驱动电流的精细调节。并搭建平台对系统进行重复性测试,实验结果表明,测试系统具有较高的可靠性和稳定性,能够满足光谱仪的精确定位要求,使电机在工作寿命内按计划完成定标工作。     

Computer simulation of the processes of formation of microclusters on the basis of scaling invariance of random walk

On the basis of scaling invariance of the process of random walk, a discrete three-dimensional algorithm is developed and implemented for computer simulation of the multistage processes of formation of porous clusters in a crystal matrix. A software package is worked out that provides the simulation of dynamic processes of clustering deep in the crystals with allowance for surface processes, applied external fields, and chemical reactions accompanying the processes of clustering. The morphological pattern of pores formed by the simulation is correlated with the behavior of the current-voltage characteristic of anodizing.     

Tail of the distribution of sums of log-normal variates

It is shown that the asymptotic behavior of the tail of the sum distribution of a finite number of individually log-normal distributed variates displays the log-normal character of those variates with maximum logarithmic variance. A quantitative definition of the sum-distribution "tail" is established in terms of upper bounds on the relative error or deviation from the asymptotic log-normal property.     

Solvability of problems of excitation of plane-layered metamaterial media

It is shown that the problem of excitation of a magnetodielectric layer with parameters ? and μ equal to minus unity by a point source is not always solvable. Conditions under which the problem has a solution are established. It is found that, in the vicinity of the singular point ? = μ = ?1, determination of the field is an illposed problem: Small variations in these parameters result in large changes of the field.