新课程标准下信息技术教师怎样备好课

新课程要求我们的信息技术教师必须以科学研究的态度对教学内容进行广泛的积累,对教学内容进行刻苦的钻研,对教学对象进行全面的了解,对教学步骤进行周密的安排,对教法和学法进行认真的探讨。     

手机辐射下人体比吸收率的研究

本文对手机电磁辐射对人体影响进行阐述,对实验测量方法和数值计算方法进行了概述,并对今后研究的方向进行分析。     

一种测控仪监控软件的设计和实现

加工、制造等行业中往往需要对材料的拉伸强度、压缩强度等性能指标进行测试,测控仪是对这些性能指标进行测试的必备工具之一。测控仪监控软件使得用户能够通过PC机直观地查看系统运行状况,对测试数据进行处理并对测控仪进行控制。本文按照模块化的设计方法对监控软件的各个模块进行了设计,并对软件进行了实现。     

MATELAB在电力系统仿真中的应用

该文主要对MATELAB进行分析，对MATELAB在电力系统仿真中的应用进行探究。文章首先分析了MATELAB特性，对MATELAB内容进行概述。其次对MATELAB在电力系统中的应用算法进行探究，依照文献分析法对上述内容进行总结。最后在上述基础上以MATELAB仿真应用实例为主体，对MATELAB软件应用进行深入挖掘。该文对MATELAB在电力系统仿真的发展具有一定的贡献性作用。     

网络教学设计中的学习者特征分析刍议

教学设计是决定一门课程成功与否的关键因素,网络教学也是如此。文章对教学设计中的一小部分--学习者特征分析进行讨论。网络教学中的学习者特征分析除了像传统课堂教学一样对学习者的认知发展特征进行分析、对学习者起点水平进行分析、对学习者认知结构变量进行分析、对学习者学习风格进行分析、对学习者学习动机进行分析外,还要对学习者的计算机使用能力、学习能力、组织能力、学习目标的层次等进行分析。     

网络教学设计中的学习者特征分析刍议

教学设计是决定一门课程成功与否的关键因素,网络教学也是如此.文章对教学设计中的一小部分--学习者特征分析进行讨论.网络教学中的学习者特征分析除了像传统课堂教学一样对学习者的认知发展特征进行分析、对学习者起点水平进行分析、对学习者认知结构变量进行分析、对学习者学习风格进行分析、对学习者学习动机进行分析外,还要对学习者的计算机使用能力、学习能力、组织能力、学习目标的层次等进行分析.     

PE文件中的库函数识别算法

本文提出了一种对PE文件中库函数进行识别的方法,首先对PE文件的格式进行了介绍,在进行识别时对PE文件进行反汇编,然后对汇编代码进行识别。最后给出了识别库函数的非展开形式和展开形式的方法。     

基于局部差分隐私的数据收集保护

为了满足收集数据时在用户端就对数据进行隐私保护的要求,谷歌提出了RAPPOR算法。在相对不大的用户数据记录收集时,RAPPOR算法并不适用,文中对其做出了改进并称之为I-RAPPOR算法。在对用户数据进行随机扰动之前,先对用户数据进行编码,即对用户数据在Bloom filter上进行哈希映射,再对数据运用随机响应技术。最后对用户数据进行校正并进行统计,利用KL-散度进行数据效用度量。实验结果表明I-RAPPOR算法能够很好的对用户数据进行隐私保护,并具有良好的可用性。     

综采工作面液压系统整体优化研究及应用

针对传统乳化液净化不彻底，并直接采用工作面用水的几个重大危害，该文对综采工作面液压系统的特点及整体优化性能进行研究，既对乳化液进行净化，又对配比用水进行软化等方面进行整体研究，并对其带来的综合经济效益进行了分析。     

在Déjà Vu X中进行翻译任务分配的方法

本文对在DéjàVuX中进行翻译任务分配的方法进行了全面介绍,并对各种不同的分配方法进行了比较,在此基础上重点介绍了对一定单元内所包含的字数进行统计的方法,以便对翻译项目进行灵活、全面的管理和控制。     

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.     

An on-line scaling method for improving scalability of a database cluster

The explosive growth of the Internet and database applications has driven database to be more scalable and available, and able to support on-line scaling without interrupting service. To support more client's queries without downtime and degrading the response time, more nodes have to be scaled up while the database is running. This paper presents the overview of scalable and available database that satisfies the above characteristics. And we propose a novel on-line scaling method. Our method improves the existing on-line scaling method for fast response time and higher throughputs. Our proposed method reduces unnecessary network use, i.e. , we decrease the number of data copy by reusing the backup data. Also, our on-line scaling operation can be processed parallel by selecting adequate nodes as new node. Our performance study shows that our method results in significant reduction in data copy time.     

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.     

大肠杆菌pheA与tyrB基因的克隆与串联表达

为探讨用基因工程的手段改良苯丙氨酸的发酵菌株，采用聚合酶链反应（ＰＣＲ）的方法，从大肠杆菌总ＤＮＡ中克隆得到了编码苯丙氨酸合成途中的两个关键酶基因－即分枝酸变位酶（ＣＭ）／预苯酸脱水酶（ＰＤ）基因ｐｈｅＡ与苯丙氨酸转氨酶（ＰＡＴ）基因ｔｙｒＢ，在大肠杆菌中进行了这两个基因的单个和串联表达。ｐｈｅＡ和ｔｙｒＢ基因分别都能在λ噬菌体的ＰＲ启动子之后得到较大量的表达，在ＳＤＳ－ＰＡＧＥ上出现清晰的条带，     

四川溲疏属的分类研究 （Ⅱ）：种的简介及新分类群

介绍了四川溲疏属植物20种,5变种及1栽培变型,每种均有文献考证、学名订正、特征集要及产地和生境,新分类群D.leiboeneie P.He et L.C.Hu, D.piloea var.longiloba P.He et L.C.Hu,D.jinyangensis P.He eL L.C.Hu及D.longifolia var.deneitomentosa P.He et L.C.Hu均有详细拉丁文描述并附模式标本照片,还记录了两个四川省新分布种:D.bodiaieri Rehd.,D.rehderiana C.K.Schn.,对伞花亚组Subsect Cymosae Rehd.中建立的新系(Ser.Multiradiatae P.He,Ser.Pauciradiatae P.He)作了拉丁文补充描述。     

在Java技术之Servlet中实现文件的上载功能

Java这门编程语言以及相关技术的使用得到快速的增长;现在大约有700多万台计算机正在运行Java应用程序,有近100万的Java开发人员,世界上所有的企业中,几乎有一半正在开发 Java应用程序。Java成功的理由是很自然的,Java是真正与平台无关的,它是适合于任何操作系统的一种通用的编程语言;Java是完全面向对象的,这在软件工程和组件技术方面有了很大的进步;Java的安全模型是成熟的,这与其他容易感染病毒的模型系统形成了鲜明的对比。     

采用有限差分方法求解固体弹性应力场(英文)

为了采用全有限差分方法进行涡轮气热弹耦合计算,研究了固体弹性应力场计算的物理模型,给出了任意曲线坐标系下的控制方程.同时研究了定常问题的有限差分求解方法和边界条件的给定,编制了定常问题的应力场求解程序;并通过对具有解析解的受集中载荷的悬臂梁和一端受径向集中力的曲梁进行数值计算来验证该固体弹性应力场的求解方法.结果表明,边界条件的二阶精度处理的格式所得结果与解析解数据吻合得较好,而一阶精度格式结果与解析解有较大的误差.     

中国阳蝇属六异名记述(双翅目:蝇科)

阳蝇属是蝇科最大的属之一,迄今全世界已知阳蝇属约666种,分布于世界各大地理区。近年来对阳蝇属种团和类群的研究,发现在我国阳蝇属中存在一些异名问题。在我国阳蝇属已知226种中,发现小兴安阳蝇(Helina xiaoxinganna Xue,2001)、茂县阳蝇(Helina maoxianica Feng,2008)、后曲阳蝇(Helina postiflexa Xue,Feng& Tong,2008)、团宝山阳蝇(Helina tuanbaoshanica Feng,2007)、兴凯阳蝇(Helina xingkaihuica Feng& Ye,2007)和错那阳蝇(Helinacuonaica Feng&Xu,2008)等6个种存在同物异名问题,并根据模式标本及原始文献,指出了同物异名的理由,明确给予了订正。     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to