CD-ROM数据库在我国图书情报界的应用综述

光盘是一种用激光记录和再现信息的存储载体，是当今最先进的高密度存储介质。光盘技术是集激光技术、计算机技术和通讯技术于一身的一种新兴的复合技术。这种高新技术手段尽管最初是为解决计算机外贮介质引起的，但是首先应用的是以图书情报为对象而建立的信息数据库。     

专家预言未来70年十大灾难

黑洞吞噬地球排首位英国《卫报》近日请10位世界顶尖科学家列出了未来70年可能会出现的灾难。一、“黑洞”吞噬地球。物理学家担忧美国纽约布鲁克哈文实验室的全球最大粒子加速器将产生类似黑洞的高密度物质,把整个地球吞噬。二、机器人控制世界。科学家预计在不到半个世纪的时     

聚(N-异丙基丙烯酰胺)及聚(N-异丙基丙烯酰胺-共-丙烯酰胺)水凝胶的制备及性能

The thermosensitive poly （ N-isopropylacrylamide ） （PNIPAAm） and poly （N-isopropylacrylamide-co-acrylamide） [ poly （NIPAAm-co-AAm） ] hydrogels with different acrylamide molar percentage are prepared by radiation polymerization using Co^60 γ-ray. Their swelling equilibrium data in the media of deionized water, NaCl aqueous solutions and different pH buffer solutions are determined. It appears that lower critical solution temperature （LCST） of the hydrogels will drop with the increase of ionic strength and increase with the rising of acrylamide content, A semi-empirical formula is set up with the experimental results. Moreover, it also indicates that this copolymer is pH-sensitive, which is similar to the homopolymer of PNIPAAm.     

高密度视频磁记录邻近磁迹串扰的消除

高密度视频磁记录 ,采用A磁头记录时相位不旋转 ,B磁头记录时每行相位增加 90° ,使用梳状滤波器使直通信号与延迟两行的信号相加 ,消除邻近磁迹干扰。     

聚乙烯在纺织品整理中的应用

介绍了聚乙烯的制造方法 ,重点阐述了聚乙烯在织物后整理和服装衬布加工中的应用     

新课程理念下的思政课合作学习及其实施策略

合作学习是目前世界上许多国家都普遍采用的一种富有创意和实效的教学理论与策略体系。在合作学习中,由于有学习者的积极参与,高密度的交互作用和积极的自我概念,使教学过程远远不只是一个认知的过程,同时还是一个交往与审美的过程。下面结合新课程思想政治课,谈谈合作学习的实施策略。     

超高压压缩机汽缸螺栓剩余疲劳寿命的评估

汽缸螺栓在压缩机的吸、排气的压差交变戴荷作用下，使用一段时间后可能会产生疲劳失效破坏。因此有必要对这些在役使用的汽缸螺栓疲劳寿命进行评估，以确保装置的安全生产。一般来说。汽缸螺栓使用一段时间后都会产生一些缺陷，因而。我们利用裂纹扩展速率与螺栓的临界裂纹尺寸对螺栓的剩余寿命进行计算。并得出了它的剩余使用寿命。     

Application of High-Density Seismic Image in Nondestructive Exploration of Cut-off Cement-Soil Wall in Earth Dam

In order to quickly explore the quality of cut-off wall in dams, a new method of high-density seismic image was adopted and estimated by model and in-situ wall tests. The vibration exciter was employed and several parameters such as hypocentral distance, length of signal record and sampiing space in signal collection were determined, which are 8 m, 0.25 ms and 128 ms respectively. Through time and frequency field signal analyses, it is concluded that, the smaller arrival times of reflected longitudinal and surface waves, and the higher their main frequencies, the higher the strength of the wall, vice versa. Accordingly the construction quality of the wall can be evaluated quickly by high-density seismic image.     

淋漓尽致发挥互联网优势

中国经济网自5月12日下午收到四川汶川发生强烈地震的消息后,迅速调集网站多部门优势资源,紧急策划,分工协作,第一时间利用图文、视频、跟帖、博客、播客等所有网络手段全面报道,专题,专辑等主题策划内容随即跟上,并以每日推出1-2个策划的高密度迅速铺开。各项工作有条不紊进行,报道声势打破以往纪录,     

乙烯基聚合物和(口恶)二唑衍生物的电致发光器件中激基复合物的蓝色发射

Two types of molecular and polymer devices employing (2-(4′-biphenyl)-5-(4““““““““-tert-butylphenyl)-1,3,4-oxadiazole) (PBD)and poly(N-vinylcarbazole) (PVK) as electron transport and hole transport materials, respectively, have been fabricated. The structures of these two devices are ITO/PVK( 70 nm)/PBD(60 nm)/A1 and ITO/PVK: PBD (1:1 by mass, 70 nm)/A1. The formation of exciplex is evident by comparing the electroluminescence (EL) of a bi-layer device and the photoluminescence (PL) of a PVK and PBD mixed film.The maximum emission energy of exciplex evaluated is consistent with the peak emission of EL. Blue emissions from both devices are obtained. The type of exicplex is interpreted based on the energy level diagram of the bi-layer device.