IPTV：广电网络如何应对?

在信息传播迅猛发展的今天,IPTV的出现,给广电网络带来了难得的发展机遇,同时,也给广电网络带来了严峻的挑战.本文通过介绍IPTV及其优势,分析广电网络发展IPTV条件,着重阐述了广电面对IPTV所应采取的策略.     

IPTV技术探析

本文从IPTV的兴起出发,介绍了IPTV的概念,又从IPTV存在的缺陷提出了解决的技术,更好地推动了IPTV业务的普及和推广,让我们充分享受科技进步带来的视听新生活。     

IPTV技术探析

本文从IPTV的兴起出发,介绍了IPTV的概念,又从IPTV存在的缺陷提出了解决的技术,更好地推动了IPTV业务的普及和推广,让我们充分事受科技进步带来的视听新生活.     

浅谈IPTV技术对我国数字电视发展的影响

本文介绍了IPTV技术和发展现状,并进一步分析了IPTV技术可能对有线数字电视的发展所带来的影响。     

IPTV高清机顶盒的关键技术研究

IPTV指的是交互式网络电视,而IPTV机顶盒则是IPTV中一个非常重要的设备,在一定程度上决定了IPTV的发展。本文对当前IPTV机顶盒系统需求和IPTV机顶盒系统架构进行了分析,着重研究了IPTV高清机顶盒的关键技术,并介绍了IPTV机顶盒的测试内容和方法,有效推动了IPTV的推广。     

浅析网络电视IPTV

本文介绍了IPTV的基本概念、特点、用途,简单阐述了IPRV在国内和国际的发展状况以及它给现代人生活带来的变化.     

电信运营商如何应对IPTV市场的挑战

介绍了IPTV的概念及其发展意义,分析了电信运营商在IPTV产业链中的地位,提出了应对IPTV市场的措施。     

基于Windows Media流媒体技术的IPTV

简要介绍IPTV的发展现状和实现IPTV的关键———流媒体技术,对IPTV实现的基本原理和关键技术进行了阐述,结合微软的W indowsM ed ia流媒体技术详细描述IPTV系统的组建和实现方法,分析IPTV的未来广阔的应用前景.     

WiMAX在IPT9V系统中的研究

本文主要分析了WiMAX的关键技术和WiMAX作为IPTV接入的优势,并提出基于WiMAX接入的IPTV的系统架构,分析用户站接收IPTV业务流程。     

IPTV数字版权管理解决方案研究

随着三网融合步伐的加快,网络电视(IPTV)的普及已成为必然。如何保证IPTV在制作、分发、传播和收看各个环节的安全,建立有效可行的访问控制和版权保护措施是内容创作者和版权所有者普遍关注的焦点。在详细讨论了实现IPTV数字版权管理相关技术的基础上,给出了一种IPTV数字版权管理的解决方案,基于该方案设计并实现了IPTV数字版权管理的演示系统,演示结果表明该方案能对IPTV中音视频媒体的版权进行有效保护。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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Brief Introduction to “Journal of Jilin University( Science Edition) ”

<正>"Journal of Jilin University(Science Edition)"is a comprehensive academic journal in the fields of science sponsored by Jilin University and administrated by the Ministry of Education of the Peoples Republic of China.The journal started publication in 1955.The original name at starting publication was"Journal of Natural Science of Northeast People University",which was changed into"Acta Scientiarum Naturalium Universitatis Jilinensis"in 1958 owing to the name change of the university.The present journal name has