首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   11篇
  免费   0篇
化学工业   5篇
能源动力   1篇
一般工业技术   2篇
冶金工业   2篇
自动化技术   1篇
  2021年   1篇
  2018年   1篇
  2013年   1篇
  2012年   3篇
  2011年   1篇
  2010年   1篇
  2009年   2篇
  2007年   1篇
排序方式: 共有11条查询结果,搜索用时 31 毫秒
1.
通过与低频段天线罩在设计和制造过程的对比,分别从介质层厚度、入射角特性、材料、工艺方面入手,对毫米波天线罩的性能进行论述,并设计试验过程对其进行验证。指出毫米波天线罩在研制过程中与低频段天线罩存在很大的不同,影响因素更多,同时指出材料的更新和工艺方法的提升成为毫米波天线罩能否研制成功的关键。  相似文献   
2.
电学渗漏检测在防渗土工膜施工质量保证中的应用   总被引:1,自引:0,他引:1  
探讨垃圾填埋场防渗土工膜施工破坏的各种情况以及施工保证措施,着重介绍了电学渗漏位置探测的原理及其在施工质量保证中的作用。  相似文献   
3.
Change point detection in social networks is an important element in developing the understanding of dynamic systems. This complex and growing area of research has no clear guidelines on what methods to use or in which circumstances. This paper critically discusses several possible network metrics to be used for a change point detection problem and conducts an experimental, comparative analysis using the Enron and MIT networks. Bayesian change point detection analysis is conducted on different global graph metrics (Size, Density, Average Clustering Coefficient, Average Shortest Path) as well as metrics derived from the Hierarchical and Block models (Entropy, Edge Probability, No. of Communities, Hierarchy Level Membership). The results produced the posterior probability of a change point at weekly time intervals that were analysed against ground truth change points using precision and recall measures. Results suggest that computationally heavy generative models offer only slightly better results compared to some of the global graph metrics. The simplest metrics used in the experiments, i.e. nodes and links numbers, are the recommended choice for detecting overall structural changes.  相似文献   
4.
This research evaluated the use of sewage sludge and refuse incineration bottom ash to replace calcium sulfoaluminate cement(CS(_)A) in making controlled low-strength material(CLSM).Various properties of CLSM mixtures were characterized in terms of unconfined compressive strength,microstructure and leachability.It was found that the strength of tested CLSM mixtures ranged from 3.6 to 9.0 MPa,over the upper excavatable limit of 2.1 MPa.The micro-structural analysis revealed that sewage sludge and bottom ash were crystallochemically in-corporated within CLSM systems by forming the needle-like ettringite(C3A?3CS(_)?H32) with exiguous tubers via the typical Pozzolanic Reaction,leading to a dense and low-porosity microstructure.Furthermore,the toxicity charac-teristic leaching procedure evidenced that the cumulative leachable metals in the leachate were much below the regulatory thresholds.The potential for using sewage sludge and bottom ash in CLSM making was thus confirmed.  相似文献   
5.
We analyzed a database of a direct numerical simulation of natural convection in a vertical channel. The flow is driven by a constant temperature difference imposed at the walls (Ra = 5.4 × 105, Pr = 0.7). The averaged flow and turbulent statistics are in good agreement with previous direct numerical simulations reported in the literature. Contrary to forced convection flows, the fluctuations of the heat transfer rate are uncorrelated with the fluctuations of the wall shear stress, which exhibit a symmetric probability density function. At the low Rayleigh number considered, the large-scale structures, which consist mainly in two counter-rotating vortices, with sizes comparable to the separation of the walls, are responsible for the extreme fluctuations of the wall heat transfer rate. The occurrence and the averaged topology of these structures have been determined using a conditional sampling technique.  相似文献   
6.
朱翔  刘大超  卢永 《广东化工》2012,39(1):39-40,56
采用木屑固定化白腐真菌并对焦化废水进行处理,有机物降解的宏观动力学符合一级反应动力学,动力学模式为lnS=-Kt+lnS0。在15~30℃范围内反应速率常数K随温度升高不断增大,在30~40℃范围内反应速率常数K随温度升高不断降低,在30℃时反应速率常数最大K=0.0265 h-1。  相似文献   
7.
表面包覆技术可以有效解决超细粉体稳定性低及分散性差等缺点,并通过复合赋予其新的物理、化学等特殊功能。本文以固相包覆法、液相包覆法、气相包覆法分别较详细论述了当前超细粉体表面包覆技术的研究进展,并对常用的表面包覆方法进行了介绍。  相似文献   
8.
热浸镀锌液中添加合金元素,将对镀层厚度、显微组织、耐蚀性和外观质量等产生重要的影响.本文重点介绍了含有Ni、Mg、Ti、Mn、Bi 5种合金镀层技术,探讨了这几种合金元素对热浸镀层组织、性能的影响,并展望了其发展趋势.  相似文献   
9.
"Satellite communication in motion(SCM,动中通)"具有覆盖区域广、不受地形地域限制、传输线路稳定可靠和移动通信的优点,在军民两个领域都具有极为广泛的发展前景。天线罩是保护"动中通"天线的必要设备。本文介绍了高性能动中通天线罩的设计、工艺制造及应用,通过研究高性能天线罩材料的基本性能,对Ku波段天线罩进行铺层设计。利用ANSYS结构分析软件,对Ku波段的高性能动中通天线罩进行了结构优化分析;同时对工艺、电性进行了适合使用的优化设计,并简单介绍了设计制造的天线罩应用前景。  相似文献   
10.
膜浓缩液成分复杂,各物质浓度高,易造成二次污染,已成为膜处理技术在渗沥液处理方面的发展瓶颈。针对当前处置技术减量效果低、资源化程度差、缺乏工程推广应用价值的情况,设计了一套垃圾渗沥液浓缩液与污泥循环资源化的工艺,并进行了工程实践与探索。该工艺充分回收利用浓缩液中的有效成分,协同处置生化污泥与炉渣,各进出指标满足相关限值,目前已完成10 t/d的中型工程试验,为固废综合处置基地的渗沥液污泥等资源化处置提供有效技术借鉴。  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号