PDF文件链接信息提取与修改

主要介绍了航空规章采用PDF文件格式,使用了书签、链接功能;利用AdobeAcrobat提供的编程接口编写Plug-in插件,实现了文件内和文件间的链接信息自动生成技术。     

笔记本电脑

如果你曾经看过去年的《微型计算机》增刊，也许还记得《你的第二台电脑之笔记本电脑》。如果说我们去年写的像是一篇恋受攻略，试图让各位比较清晰地了解并找到适合自己的笔记本电脑。[编者按]     

基于DNS的负载均衡算法研究

随着网站访问量的增加,一些网站往往有多个地理上分布的提供相同服务内容的服务器群组,因此需要进行负载均衡处理。文章概括分析了现有的几种负载均衡算法,并提出了两种基于DNS的负载均衡新方法。该方法通过域名解析,根据每个服务器的可用性、客户与服务器之间的距离,以及地理范围匹配值,按照从优到劣的顺序返回网站的多个服务器的IP地址。     

用Web服务构筑企业应用集成

向 B2 B电子商务迁移是现代企业的发展方向 ,迁移的前提是要有良好的企业内部应用集成和商务流程的集成。针对当前企业内部应用集成应用中存在的问题 ,文章引入了一种新的企业内部应用集成解决方案——用 Web服务搭建企业内部的应用集成 ,阐述了在企业内部如何应用 Web服务实现高效率、低代价的应用集成和商业流程重组     

复杂载荷历程下疲劳寿命的预测方法

近年来局部应力-应变法在疲劳寿命预测中,越来越受到人们的高度重视。但普通的Neuber局部应力-应变法对于每一名义应力变程都需要建立新的坐标原点,并解非线性方程组。为此本文对其算法技巧进行了研究。算例表明,本文提出的新算法,能保证足够精度,程序得以简化,运算速度大幅度提高。     

ZA—27新型铸造材料分析

新型铸造材料ＺＡ—２７是用来代替锡青铜合金的理想材料。我们对该合金的化学成分，熔炼工艺、浇铸工艺及其主要性能，金相组织进行了较为系统的研究。     

一种实用的有效厚度电性解释标准转换方法

针对新站油田开发之前没有开发井有效厚度电性解释标准的实际,通过ＣＳＵ和国产８９００两套测井系列之间相似性对比,借助两者相关关系,及时制定出开发井有效厚度电性解释转换标准。该方法经实际验证,应用效果较好,为新油田开发的早期介入及实际经济,有效地开发提供了新思路。     

压力下屏蔽对有限深量子阱中施主结合能的影响

考虑电子有效质量、材料介电常数及禁带宽度随流体静压力的变化,以及准二维电子气对杂质库仑势的屏蔽影响,利用变分法讨论有限深量子阱中的施主杂质态能级.对GaAs/AlxGa1-xAs量子阱系统中的杂质态结合能进行了数值计算,给出结合能随铝组分、阱宽和压力的变化关系,并讨论了有无屏蔽时的区别.结果表明,屏蔽效应随着压力增加而增加且显著降低杂质态的结合能.     

Crystal structure of an anti-anti-idiotype shows it to be self-complementary

The structure of the Fab fragment of the mouse anti-anti-idiotypic monoclonal antibody (mAb) GH1002 was solved by X-ray crystallography. mAb GH1002 was elicited with the syngeneic anti-idiotype mAb MK2-23 which mimics the determinant defined by anti-human high molecular weight-melanoma associated antigen (HMW-MAA) mAb 763.74. The Fab fragments of mAb GH1002 exist in the crystal as dimers related by crystallographic 2-fold axes. The interface between dyad-related Fab fragments is formed primarily by interaction of the hypervariable loops of one with the other. The self-interaction of Fab fragments of anti-anti-idiotypic mAb GH1002 through their combining sites is extremely tight and intricate, closely resembling that observed in structures of id-anti-id complexes, and comparable in terms of total contact area, charge complementarity, and number of hydrogen bonds. The self-complementarity of the antibody observed here could be coincidental and thus reflect some non-specific binding capability. It might, on the other hand, be immunologically relevant and exemplify a certain degree of evolved self complementarity characteristic of antibodies participating in idiotypic cascades.     

Hydrothermal-electrochemical deposition of hydroxyapatite

Age-related differences in the trajectories of saccadic eye movements were examined. Younger and older adult subjects produced saccades to predictable target locations. Detailed features of the movements were examined such as the time of peak acceleration and the variability in the magnitude of the peak velocity. These and other measures reveal important details of the force pulses underlying the eye movements and the mental mechanisms that control them. Although minor differences were apparent between the eye movements of younger and older adults, the general patterns were the same across age groups. These results suggest that fundamental details of the brain mechanisms involved in the control of movement are the same for younger and older adults.