建筑外墙涂料饰面应注意的几个问题

建筑外墙涂料是近年来广泛采用的建筑装饰材料。本文针对建筑物饰面存在的掉色、粉化和剥落等问题,就涂料的选择、基层龄期、施工温度控制以及稀释、喷刷等环节进行了阐述,提出了一些具有适用价值的建议。     

全章目录学辨

Quan Zuwang and Zhang Xuecheng were both bibliognosts of Qing Dynasty. In Quan s theory of bibliography, there is neither the connotation of enlightenment thought nor the ideological content of, what is called the Yi Wen Xue An in Zhang s bibliographical thinking, which, together with his literary and historical thinking has reciprocal outward show and inner thought. He had founded the theory of new bibliography and developed a school of his own. It s true that his theory carries on the theories of his predecessors and those of the same generation of him,but it is by no means the product of "being very close"to any of theirs.     

图书馆要主动为读者服务

The formulations "All for the readers" and "Readers, the Supreme" highly summarize the meaning of serving the readers whole-heartly. To take the initiative to serve the readers is to bring into full play the librarians subjective initiative to find out of his own accord the readers opinions and demands and in all earnestness combined with a matter-of-fact and scientific analytical attitude to create unceasingly the way to serve readers and an administrative mechanism, both of which accord with the objective law.     

联机公共检索目录系统的发展

Since the development of the Online Public Access Catalogues in the 1970s, libraries in Europe and America have devoted more and more attention to it. To date, it has already developed to the third generation. The OPAC System makes those users who lack training and experience be able to use it directly. It provides the users a kind of capability to access, which is neither like the order language with a very complex function, nor is it like the "menu" one with a very simple function. The interface design of it is an important phase of OPAC device,the study of which falls into the following categories;1)the matching aid.2)the retrieval aid.and 3)the semantic/contextual aid.The successful practice of the development and services of OPAC opens up a wide range of prospect for readers to use library materials directly.     

基于惯性传感器的倾角测量及温漂补偿系统设计

MEMS惯性传感器的组合可实现高精度的倾斜角度检测,但MEMS惯性传感器容易受环境温度变化的影响产生输出漂移,影响检测精度。针对该问题,本研究以MPU6050惯性器件为对象,融合陀螺仪和加速度计构建了一种带温度补偿的角度测量系统,利用芯片内置温度传感器的输出数据,根据该补偿模型对角度输出进行实时补偿。试验结果表明,通过温度补偿,在20~75℃,角度输出的温度敏感度从未经补偿前的0.019(°)/℃降低到了0.0044(°)/℃,有效提升了系统的环境适应性和稳定性。     

改革十年的图书馆学:——“理论与实践脱节”解决方法研究述评

For more than ten years,lots of ways have been set forth to salve the problem of"theory di-vorced from practice",such as:the study of library science should move towards an orderly way andintensiveness;an institute of library science studies should be set     

《商君书》、《申子》、《慎子》流传考略

Shang Jun(商君),Shen Zi(申子),and Shen Zi(慎子)were personages of legalist in Pre-Qin."Shang Jun Shu"was spread in Warring states,and was lost in Song dynasty.The old edition the per-son saw in Qing dynasty was the edition of Yuan dynasty,and then the oldst edi     

图书馆网站易用性研究——基于A—Prompt软件的分析

论文分析了现阶段网站设计的研究方向,阐述了网站易用性研究的重要性及必要性;并以南京图书馆主页为研究对象,利用A—Prompt软件分析了该网页在网站易用性上存在的问题,同时提供了修改建议与方法。     

浅析高温下LD用于视频直接调制传输的劣变

本文结合在实际工作中所观察到的使用直接强度调制的PFM9603光发射机传输电视基带信号出现的故障现象,综合出现故障时的工作环境和自然条件,根据半导体激光器在不同温度条件下P-I曲线和阈值电流变化的原理,定性分析和解释较高温条件下(>25℃)LD用于视频信号直接调制传输所产生的劣变。     

巧用Curves曲线调整原稿阶调复制曲线

当前，随着彩色桌面出版系统的应用日趋普及．人们运用各种图像处理软件对图像进行阶调调节。彩色图像的阶调复制似乎可以很轻松的完成，然而实际情况并非如此。由于印刷复制品的密度范围一般比原稿要小，所以在复制后必然会使原稿的阶调被大大地压缩。而彩色显示屏所显示的图像亮度范围大．相应的阶调压缩量较小，不易被觉察。但当图像的阶调被限制在较小的反映原稿亮度变化的印刷密度范围内时，这种压缩的比例就会被放大，从而使彩色显示屏和印刷品再现图像所产生的视觉感受产生很大的差异。因此，图像阶调的调节决不能仅仅依靠观察彩色显示屏的显示效果，而是必须细致、充分地分析原稿阶调再现的重点以及原稿所表现的内容与主题，在此基础上对阶调复制曲线进行调整。