HDTV视频和音频的压缩标准MPEG

高清晰度数字电视(HDTV)是电视发展趋势，其关键是解决视频和音频的压缩，本文介绍了压缩标准MPEG，尤其是MPEG—2。     

TMPGEnc Plus软件在MPEG编码教学中的应用

本文介绍了TMPGEnc Plus编码软件在视频压缩技术教学中的应用。TMPGEnc Plus编码软件主要用于MPEG视频格式的测试。MPEG是活动图像专家组(Moving Picture Experts Group)的缩写。其主要任务是负责制定适用数字存储媒介、电视广播和通信等应用场合的视频和音频的压缩编码标准。这个专家组开发的标准称为MPEG标准。TMPGEnc Plus编码软件可以对MPEG各种标准进行分析测试,使学生比较好地掌握MPEG压缩编码标准,直观方便地学习压缩编码技术。     

IPEG-4视频编码核心思想与关键技术

随着通信和网络技术的飞速发展，多媒体及其视频流应用越来越广泛，同时用户也对视频传输速率和图像质量有更高的要求，MPEG-4标准适时地解决了多媒体压缩存储和传输的问题。本文结合MPEG4的技术特点，阐述了MPEG4视频压缩编码技术的核心思想和关键技术。     

MPEG视频的镜头分割技术

随着多媒体压缩技术的不断发展，大量的数字视频都是以MPEG压缩格式存储。基于压缩域的镜头分割技术，由于不必完全解码，因此计算复杂度小，速度快，越来越受到研究者的关注。本文简要介绍MPEG视频流的基本结构，分析和讲座了MPEG视频镜头的切换检测技术以及关键帧的提取方法。     

图像压缩技术

着重说明图像压缩的目的及意义,并介绍一些代表性的图像数据的压缩方法.另外还介绍了静态图像的标准压缩格式JEPG和动态图像的标准压缩格式MPEG,并对图像和视频压缩的热点问题作了初步的探讨.     

图像压缩技术

着重说明图像压缩的目的及意义,并介绍一些代表性的图像数据的压缩方法.另外还介绍了静态图像的标准压缩格式JEPG和动态图像的标准压缩格式MPEG,并对图像和视频压缩的热点问题作了初步的探讨.     

MPEG-Ⅱ实时编码系统中音频编码的实现

基于利用人的听觉心理模型对音频信号进行压缩的管理,描述了MPEG音频压缩标准所采有的MUSICAM算法,并提出了MPEG－Ⅱ实时编码系统中音频编码模块的实现方案,该方案利用手机CPU来完成音频编码的工作,既可充分利用系统资源,又可降低成本,实践表明,该方案满足实时性,稳定性等方面的设计要求。     

JPEG、MPEG标准简介

多媒体数据的数据量巨大，如果不对它进行压缩，是无法在计算机中存储和传送的，也无法在多媒体信息系统中处理．几十年来，人们已经研究了许多种数据压缩的方法．文章着重介绍了静态图像压缩标准JPEG和动态图像压缩标准MPEG，这两个标准为我们的使用带来很大的方便。     

MPEG-4视频编码核心思想与关键技术

随着通信和网络技术的飞速发展,多媒体及其视频流应用越来越广泛,同时用户也对视频传输速率和图像质量有更高的要求,MPEG-4标准适时地解决了多媒体压缩存储和传输的问题.本文结合MPEG4的技术特点,阐述了MPEG4视频压缩编码技术的核心思想和关键技术.     

MPEG视频的镜头分割技术

随着多媒体压缩技术的不断发展,大量的数字视频都是以MPEG压缩格式存储.基于压缩域的镜头分割技术,由于不必完全解码,因此计算复杂度小,速度快,越来越受到研究者的关注.本文简要介绍MPEG视频流的基本结构,分析和讲座了MPEG视频镜头的切换检测技术以及关键帧的提取方法.     

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.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

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     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the