可录DVD格式介绍

每当有新科技出现,市场上总要花一点时间来 习惯和适应新格式,ＤＶＤ亦不例外。除了普通的只读ＤＶＤ外,现在可供录写的ＤＶＤ格式非常多,最可怕的是,直到现在为止,仍然没有一种格式可以一统天下,成为最终的ＤＶＤ可录写格式以下是现在流行的ＤＶＤ格式： ＤＶＤ- Ｖｉｄｅｏ： 在大部分家用 ＤＶＤ机ＤＶＤ－ＲＯＭ及装有ＭＰＥＧ－２解码卡的电脑上都可以读取,播放时间为 ２小时 １５分,影片格式为 ＭＰＥＧ ２。 ＤＶＤ－Ｒ： 可读取多种ＣＤ格式。用ＤＶＤ－Ｒ烧录出来的碟片可以由ＤＶＤ－ＲＯＭ及家用ＤＶＤ机读取,但与 Ｄ…     

元数据字典及其实现

本文提出了元数据字典，给出了它的模型和实现方法，元ＤＤ用于存储ＤＤ结构信息和完整性约束信息，使这些信息能从ＤＤ管理程序源代码中分离出来，因而就能够实现一个通用ＤＤ管理程序；不同软件系统可以采用结构不同的ＤＤ，这些ＤＤ的结构由元ＤＤ管理程序生成，所有ＤＤ均由一个通用ＤＤ管理程序来管理.     

DDR内存

ＤＤＲ是 Ｄｏｕｂｌｅ Ｄａｔａ Ｒａｔｅ ＳＤＲＡＭ的缩写（双倍数据速率）。ＤＤＲ ＳＤＲＡＭ内存技术是从主流的 ＰＣ６６,ＰＣ１００,ＰＣ１３３ＳＤＲＡＭ技术发展而来。这一新技术使新一代的高性能计算机系统成为可能,包括台式机、工作站、服务器、便携式,也包括新的通信产品,如路由器。ＤＤＲ内存目前被广泛应用于高性能图形适配器。 ＤＤＲ ＤＩＭＭｓ与ＳＤＲＡＭ ＤＩＭＭｓ的物理元数相同,但两侧的线数不同,ＤＤＲ应用１８４ｐｉｎｓ,而ＳＤＲＡＭ则应用１６８ｐｉｎｓ。因此,ＤＤＲ内存不向后兼容ＳＤＲＡＭ,要求…     

暑假选购指南—DVD篇

何谓ＤＶＤ？ ＤＶＤ它的全称为 ＤＩＧＩＴＡＬ ＶＥＲ－ＳＡＴＩＬＥ ＤＩＳＫ,中文意思就是数字多用途的光盘,它集计算机技术、光学记录技术以及影视技术等位一体,能够满足人们对大存储容量、高性能的存储媒体 的需求。 ＤＶＤ系列产品发展至今,已经拥有以下五大类产品： １、ＤＶＤ－ＲＯＭ──电脑软件只读光盘,用途类似于 ＣＤ－ＲＯＭ; ２、ＤＶＤ－ＶＩＥＤＥＯ──家用的影音光盘,用途类似于ＬＤ或ＶＩＤＥＯ ＣＤ; ３、ＤＶＤ－ＡＵＤＩＯ──音乐盘片,用途类似于音乐ＣＤ; ４、 ＤＶＤ－ Ｒ（或称 ＤＶＤ－ ＷＲＩＴＥ…     

奥美嘉超霸DVD

今年的夏天可算是电脑新科技的夏天,先刮Ｐ４风,后起液晶显示潮,但目前最得人气的还要算是ＤＶＤ　ＲＯＭ热浪啦！随着ＤＶＤ　ＲＯＭ价格的不断下降,再加上ＤＶＤ片源的日渐丰富,ＤＶＤ　ＲＯＭ开始进入家用电脑的配置序列。我们得到的这款奥美嘉ＰＤＶＤ　Ａ１４８光驱就是此列。性能资料传输率：ＤＶＤ　２２１６０ＫＢ／ｓ（Ｍａｘ）ＣＤ　６８４０ＫＢ／ｓ（Ｍａｘ）寻道时间：　　　ＤＶＤ　８５ｍｓ　　　　　　ＣＤ　　７３ｍｓＰＤＶＤ　Ａ１４８基本属于１６ＸＤＶＤ范畴。该光驱面板简洁,面板按键与一般ＣＤＲＯＭ一样,而…     

五款DDR主板的测试报告

越来越多的ＤＤＲ主板量产面市，随着ＤＤＲ内存的不断降价以及主板本身适中的价格，ＤＤＲ主权将加快抢夺市场的步伐。我们评测实验室对五款基于ＡＭＤ ＣＰＵ的ＤＤＲ主板进行了测试，以提供更详细ＤＤＲ主权信息，希望对情牵ＤＤＲ的消费者有更多的帮助。     

八个DVD区码区别

如果你是第一次使用ＤＶＤ，定会被ＤＶＤ的区 码制搞到一头雾水。到底什么是ＤＶＤ区码？而ＤＶＤ又为什么要有区码制？现在为大家一一剖析。 基于地理关系，全世界播放影片的时间未必一致，所以有些影片可能在美国已推出影带，但在欧洲则仍在刚刚上映。此外，某些地区盗版猖獗，为有效控制 ＤＶＤ的播放， Ｍｏｔｉｏｎ Ｐｉｃｔｕｒｅ Ｓｔｕｄｏｓ联盟便在制定ＤＶＤ标准时为ＤＶＤ推出区码制。 ＤＶＤ区码是ＤＶＤ硬件中的一部分，有了这些区码，ＤＶＤ便只可以在某些预先设定的地区播放。当然，你可以拥有多于一部不同区码的ＤＶＤ播…     

苹果便携式电脑用户能看DVD

最近苹果电脑公司推出具有先进的数字音频和视频播放功能的软件包ＤＶＤ－ＶｉｄｅｏＫｉｔ,这个软件包专为苹果便携式电脑设计,它可以使具有多媒体功能的苹果ＰｏｗｅｒＢｏｏｋＧ３电脑用户随时随地欣赏ＤＶＤ光盘。苹果电脑公司新推出的ＤＶＤ－ＶｉｄｅｏＫｉｔ软件包主要由以下三部分组成：具有光盘识别功能的ＰｏｗｅｒＢｏｏｋＤＶＤ－ＲＯＭ模块二代产品,它可以正确阅读ＣＤ－Ｒ、ＣＤ－ｉ、ＰｈｏｔＯＣＤ、音频ＣＤ以及ＤＶＤ－ＲＯＭ光盘等多种ＣＤ－ＲＯＭ光盘;ＤＶＤ播放卡ＰｏｗｅｒＢｏｏｋＤＶＤ－ＶｉｄｅｏＰＣＣａｒ…     

源兴7HI-G40 DVD-ROM驱动器

目前ＤＶＤ驱动器市场烽烟四起,各大厂商纷纷将１６倍速的产品作为目前主推的产品．由于激烈的市场竞争, 使得ＤＶＤ驱动器大有完全取代ＣＤ－ＲＯＭ之势。 源兴７ＨＩ－Ｇ４０就是一款取代ＣＤ－ＲＯＭ的１６倍速的ＤＶＤ－ＲＯＭ,采用标准的ＩＤＥ接口,兼容ＣＤ－ＲＯＭ、ＣＤ－Ｒ、ＣＤ－ＲＷ、ＤＶＤ－５、ＤＶＤ－９、ＤＶＤ－１０等多种类型的盘片格式．具有５１２ＫＢ的数据缓存．随机所附带的配件也非常全面, 模拟音频线、螺丝钉等物品一应俱全, 同时还赠送一套《豪杰超级ＤＶＤ》（正式使用版）。 在 ＣＨＩＰ评测过程中,源…     

DVD-ROM产品概要

ＤＶＤ－ＲＯＭ的运气不像ＣＤ－ＲＯＭ那样好！无论第 一代还是第二代ＤＶＤ,过高的价格和对ＣＤ／ＣＤ－Ｒ兼容问题,都使得人们对它颇为失望。但此一时彼一时,令人欣慰的是,新一代的４～６倍速ＤＶＤ－ＲＯＭ驱动器可以很好地兼容ＣＤ,甚至能够媲美市售的高档ＣＤ－ＲＯＭ驱动器。另外,相对低廉的价格,以及ＤＶＤ电影的逐渐增多,也使得越来越多的人对它发生了兴趣。由于ＤＶＤ－ＲＯＭ尚未由普通大众接受,游戏开发商甚少用ＤＶＤ作为载体。当然,前景还是非常乐观的。ＤＶＤ电影是最吸引人的一项因素,特别是如果你有大屏幕显示…     

The influence of IT: perspectives from five Australian schools

Abstract Information and Communication Technologies (ICT) are now widespread in Australian schools but with variation in how, where, when and how much they are used. Computers may be located in a computer laboratory, distributed throughout the school, or students may use their own laptop computers. IT may be a subject in its own right or ICT may be used across all areas of the curriculum. It is how ICT is used in the school setting that is important in providing students with the skills to be participate in a 'knowledge society'. This paper examines the ways in which information and communication technologies influence teaching and learning in five Australian schools. Data were gathered through observation, interviews and document analysis in schools operating at the elementary and secondary grades in relatively technology rich environments. Each of the schools participated in the Australian component of the Second Information Technology in Education Study – Module 2 (SITES-M2) of innovative pedagogical practices. Several of the studies were of specific projects where ICT was the key enabler of the learning programme. Others focused on an entire school's approach to ICT as an agent for changed approaches to learning.     

指纹自动识别系统中的预处理技术

预处理是指纹自动识别过程中的第一步，它的好坏直接影响着指纹自动识别的系统的效果。文中分灰度去噪，二值化，二值滤波法噪，细化等几部分。详细分析了介绍了指纹自动识别系统中的预处理技术，文中所介绍的算法都是经实践证明并取得了很好的效果的，具有很高的使用及参考价值。     

基于遥感与GIS的农村居民点景观特征比较

以河北省阜平县、武邑县 ,福建省清流县、惠安县作为研究区 ,利用 2 0 0 0年 TM遥感图像 ,通过解译、判读得到景观结构矢量图 ,然后利用景观生态学数量方法分析了研究区农村居民点景观特征的差异及空间分布格局。研究表明 ,研究区农村居民点规模较小 ,平原地区平均面积不到 2 0 hm2 ,山区农村居民点平均面积低于 10 hm2。农村居民点距离较近 ,山区农村居民点平均距离小于 2 .5 km,平原地区农村居民点距离小于 0 .4 hm。农村居民点规模小 ,分布零散 ,适应于农业经济的发展。为了节约居民点用地 ,应采取加快城镇及中心村发展的方针 ,促进农村居民点布局的优化     

利用MODIS EVI时间序列数据分析福建省植被变化(2000~2017年)

以全国森林覆盖率最高的福建省为研究对象,利用2000~2017年夏季的MODIS EVI植被指数数据和气象与非气象因子进行协同分析,以揭示近17年福建植被的时空变化及其影响因子。结果表明:研究期内福建的EVI均值整体上升,从2000年的0.454上升至2017年的0.505,17 a间上升了11.2%,表明福建省的植被整体处于变好的状态,且在中部和西南部的变化最明显。相关分析表明,在研究期内,气象因子(气温和降水)对EVI变化的影响不显著,植被的变好主要为非气象因子的作用。EVI的提高主要得益于2003年福建省建设生态省后森林覆盖率的提高,并和2012年开始的水土流失治理有明显关系,这说明人类活动的积极作用对福建植被的变好起到了关键的作用。     

The Possibilities of Community OR in a Third World Country

This paper shows a few possibilities for the application of Community OR in a Third World country based on experience in Venezuela. These possibilities are discussed in a framework of the relationship between the state and community organizations. Emphasis lies in showing that Community OR in Venezuela requires a deep critical commitment to emancipation in order to help community organizations develop in a rather hostile environment. Lastly, results in dealing with community organizations in Venezuela using the Interpretive Systemology approach are presented.     

Back to the Future: An Historical Perspective on the Pendulum-Like Changes in Literacy

This article focuses on the pendulum-like change in the way people read and use text, which was triggered by the introduction of new reading and writing technologies in human history. The paper argues that textual features, which characterized the ancient pre-print writing culture, disappeared with the establishment of the modern-day print culture and has been “revived” in the digital post-modern era. This claim is based on the analysis of four cases which demonstrate this textual-pendulum swing: (1) The swing from concrete iconic-graphic representation of letters and words in the ancient alphabet to abstract phonetic representation of text in modern eras, and from written abstract computer commands “back” to the concrete iconic representation in graphic user interfaces of the digital era; (2) The swing from scroll reading in the pre-print era to page or book reading in the print era and “back” to scroll reading in the digital era; (3) The swing from a low level of authorship in the pre-print era to a strong authorship perception in the print era, and “back” to a low degree of authorship in the digital era; (4) The swing from synchronic representation of text in both visual and audio formats during the pre-print era to a visual representation only in print, and “back” to a synchronic representation in many environments of the digital era. We suggest that the print culture, which is usually considered the natural and preferred textual environment, should be regarded as the exception.     

A Review of:“Safety in Manual Materials Handling.” By COLIN G. DRURY. (Cincinnati: US Dept. of Health,Education & Welfare, 1978.) [Pp. viii+ 209.]

The extension force against resistance was recorded in 23 postures for 12 subjects to find explanations for the decrease in back strength in asymmetric postures. A reduction in muscle force in asymmetric postures was found up to 40%, but was strongly dependent on the plane in which asymmetry occurred, and on the posture to which it referred. A quantitative relationship between the forces exerted in different asymmetric postures is discussed, as a basis for formulating universal ergonomic guidelines for optimal working postures. The reduction in force in different asymmetric postures can be explained by length of the muscle, the activation of the muscle, and the moment angle of the muscle.     

Workplace innovation, competitiveness and employment in a traditional industry

The article presents teamworking in practice, located in a local, regional and European context. Based on extensive experience in the textile industry in the East Midlands, lessons have been applied in the textile industry across Europe, in regional development policy, and in the development of a European Work and Technology Consortium and UK Work Organisation Network.     

Ecosystem functioning of protected and altered Mediterranean environments: A remote sensing classification in Doñana, Spain

Spatial heterogeneity in ecosystem functioning is a key component of ecological variability requiring special attention in the context of global change. A large history of human use has produced high physiognomic heterogeneity in Mediterranean ecosystems. However, the consequences for ecosystem functioning remain insufficiently understood. We analyzed spectral indicators of matter and energy fluxes in the land surface to classify the functional ecosystem heterogeneity in a Mediterranean region covering different management histories and protection types. We specifically analyzed the spatial variability in seasonal and annual patterns in the Normalized Difference Vegetation Index (NDVI), surface temperature (T_s) and albedo from five Landsat ETM images. Then we classified numerically this variability into ecosystem functional types (EFTs) and explored their seasonal dynamics in terms of photosynthetic radiation absorption and evapotranspiration. We identified eight main EFTs with ecologically relevant differences including contrasting dynamics in fPAR seasonality, great variation in incoming radiation reflection and differing evapotranspiration rates, particularly during the water-limitation period. Functional variability in natural vegetation mostly consisted in dissimilar annual rates of NDVI and albedo, whereas differences in seasonality were more evident in transformed areas. Similarly, the spatial distribution of EFTs was partly associated to protection, with two EFTs exclusive of protected areas and comparatively higher functional diversity in humanized areas. Landform effects on water availability in protected areas and human activities under different ecological settings were seemingly responsible for the large functional diversity of the region. We advocate for the explicit incorporation of multifunctional ecosystem heterogeneity in ecosystem management and monitoring designs.