H.264中差错掩盖算法

本文对视频新标准H.264中采用的两种典型差错掩盖算法进行了详尽的阐述,并对其适应环境以及它们对视频质量改进的性能作了简要分析。     

基于H.323的可扩展多用途视频监控系统的设计与实现

提出了基于H.323的可扩展多用途视频监控系统的整体框架,分析了系统的各模块功能,给出了系统的各项指标,描述了系统的设计与实现方法.     

双模压缩真空态的K次方H压缩效应

本文研究了双模压缩真空态1ξ〉=1/coshr sum from n=0 to(-e~(iθ)tanhr)~n 1n,n)的K次方H压缩效应。数值计算的结果表明:对于双模压缩真空态,光场存在着K次方H压缩效应(K=1,2,3,4,5,Λ);但是,随着方次K的升高,K次方H压缩效应减弱。     

LONG-TERM INHIBITION OF Na~ /H~ EXCHANGE ATTENUATES CARDIAC REMODELING AFTER MYOCARDIAL INFARCTION IN RATS

ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅＮａ /Ｈ ｅｘｃｈａｎｇｅｒ (ＮＨＥ)ｉｓａｐＨ ｒｅｇｕｌａｔｏｒｙｐｒｏｔｅｉｎｐｒｅｓｅｎｔｉｎｔｈｅｐｌａｓｍａｍｅｍ ｂｒａｎｃｅｏｆｃａｒｄｉｏｍｙｏｃｙｔｅｓａｎｄｏｔｈｅｒｃｅｌｌｔｙｐｅｓ.ＡｌｔｈｏｕｇｈｓｅｖｅｒａｌｉｓｏｆｏｒｍｓｏｆＮＨＥｈａｖｅｂｅｅｎｄｅ ｃｒｉｂｅｄ,ｔｈｅｐｒｅｄｏｍｉｎａｎｔｉｓｏｆｏｒｍｉｎｔｈｅｈｅａｒｔｉｓｔｈｅｕｂｉｑｕｉｔｏｕｓＮＨＥ 1 ,ｗｈｉｃｈｕｎｄｅｒｃｅｎｔａｉｎｐｈｙｓｉｏｌｏｇｉｃａｌｃｏｎｄｉｔｉ…     

能量转化与守恒定律的建立

该文介绍了能量转化与守恒定律发现的背景,并以迈耳、亥姆霍兹、焦耳等重要人物为线索,论述了能 量转化与守恒定律的发现过程.     

关于块H-矩阵的判定条件

给出了块H-矩阵的一些充分条件，这些条件为块H-矩阵的判定提供了理论基础和实用判定方法．     

计算机模拟H钢冷却过程中温度场的变化规律

应用有限元软件SUPERFORM2002对经热轧后的H型钢在冷却过程中温度的变化进行了计算机模拟，得到了H型钢在冷却过程中温度场的变化规律。分析了相变对温度场计算的影响，并把计算值与实测值进行了对比，其结果表明：计算值与实验值吻合得较好。     

催化光度法测定茶叶中铁

在HCl介质中在Fe(Ⅲ)催化作用下H2O2氧化S酸(即1-氨基-8-萘酚-4-磺酸)使之变色，变色程度与Fe(Ⅲ)的存在量之间有良好的线性关系，借此建立了新的催化光度法．本法操作简单，重现性好，选择性高，用于茶叶中铁的测定，结果满意。     

New Trends in Distance Learning Utilising Next Generation Multimedia Networks

Bandwidth capabilities of next generation networks have turned interactive multimedia services to a cost effective reality, targeting not only large companies, but SMEs and individual users as well. An application with direct social impact is tele-teaching and in the broader sense distance learning. A large numbers of colleges, universities, and other higher education institutions already offer online courses to their local and remote students, via new methods of education. In this paper, combining the WWW, the H.323/MPEG-4 protocol family and the CORBA model, we specify an open system and network architecture towards the Virtual Classroom realisation. Over this architecture an educational process is described using formal Object Modelling Technique (OMT) rules, while educational services are provided as methods of distributed objects. In this way, a framework is proposed in order to allow educational institutes to publish content in an abstract object-oriented manner, so as to become widely available via the well-known WWW interface.