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排序方式: 共有118条查询结果,搜索用时 46 毫秒
1.
本文针对安钢高炉冷却壁破损的形式、原因进行研究分析,探讨了冷却壁的结构、材质、加工与安装工艺对其寿命的影响。介绍了安钢高炉炉役后期冷却壁的维护生产实践。 相似文献
2.
W.J. Masschelein 《臭氧:科学与工程》1985,7(4):327-350
After reviewing the uses of ozone in the preparation of drinking water, high purity water for Pharmaceuticals industries, and swimming pools throughout Belgium, a discussion of technological developments made at the Tailfer plant (serving Brussels) concerning the uses of ozone is presented. These subjects include analytical and monitoring techniques developed for ozone, procedures for ozone contacting employed at this plant, treatment of ozone contactor off–gases, and the use of oxygen–enriched process gas to produce supplemental amounts of ozone required periodically. Capital and operating cost data are presented. 相似文献
3.
T. H. Wang K. H. Wang† W. L. Wang‡ S. C. Huang‡ & S. Y. Chen§ 《Journal of Computer Assisted Learning》2004,20(1):59-71
This study introduces the development of a Web‐based assessment system, the Web‐based Assessment and Test Analyses (WATA) system, and examines its impacts on teacher education. The WATA system is a follow‐on system, which applies the Triple‐A Model (assembling, administering, and appraising). Its functions include (1) an engine for teachers to administer and manage testing, (2) an engine for students to apply tests, and (3) an engine for generating test results and analyses for teachers. Two studies were undertaken to assess the usefulness and potential benefits of the WATA system for teacher education. In the first study, 47 in‐service teachers were asked to assess the functions of the WATA system. The results indicated that they were satisfied with the Triple‐A Model of the WATA system. In the second study, 30 pre‐service teachers were required to use the WATA system during the teacher‐training program. After 4 months of experience in using the WATA system, the pre‐service teachers' perspectives of assessment have been changed significantly. The findings of these two studies might provide some guidance to help those who are interested in the development of Web‐based assessment and intend to infuse information technology into teacher education. 相似文献
4.
5.
黄成兵 《网络安全技术与应用》2012,(6):17-19
本文在分析无线Ad Hoc网络路由协议研究现状的基础上,指出无线Ad Hoc网络路由协议存在的脆弱性及针对协议漏洞所发起的几种主要攻击形式。重点分析虫洞攻击的基本原理及其当前的防御方法和不足,为今后更进一步研究安全路由协议打下基础。 相似文献
6.
聚丙烯酰胺浓度测量方法综述 总被引:15,自引:0,他引:15
本文综述了11类测量HPAM浓度的方法,讨论了每一种方法的原理、特点、干扰因素和应用范围。 相似文献
7.
针对单立柱堆垛机运行过程中加减速对立柱产生的振动激励问题,以某单立柱堆垛机为研究对象进行有限元振动分析。建立该堆垛机的有限元仿真模型,基于不同加减速策略进行对比分析。分析结果表明,十五段S形加减速策略对单立柱堆垛机的振动激励最小,能够提高堆垛机的定位效率。 相似文献
8.
螺旋榨油机榨排的设计计算 总被引:2,自引:0,他引:2
设计计算榨排时如何选择材料、类型和结构作了简要述叙,对榨排的受力进行了分析,同时对不同榨排进行了强度计算和校核。 相似文献
9.
Carey M. Read Jr. Travis W. Knight Kenneth S. Allen 《Nuclear Engineering and Design》2011,241(12):5033-5038
Fast reactors containing heterogeneous minor actinide (MA) target rods are now being modeled. When studying transmutation in these rods, helium production from α-decay must be considered since it is produced in substantial quantities. This research utilized an innovative method to calculate gas production by modifying the CINDER90 depletion code used by MCNPX 2.6.0 to include helium production from α-decay. The modified CINDER90 code was verified using the ORIGEN-ARP module of SCALE6. It was tested using the Sodium-Cooled Heterogeneous Innovative Burner Reactor model created at the University of South Carolina. It is recommended that the modified version of the cinder.dat file be distributed in subsequent MCNPX 2.6.0 releases for use in fast reactor calculations using heterogeneous MA target rods since it includes helium production otherwise not available from the current version. 相似文献
10.
The changes in the carotenoid pigments of the Capsicum annuum cv. Bovet 4 during ripening have been investigated quantitatively by means of an HPLC technique. In the chromatograms, 56
peaks were detected and 34 carotenoids were identified. In the ripe fruits, capsanthin, capsorubin, zeaxanthin, cucurbitaxanthin
A, and β-carotene were found to be the main carotenoids, the remainder being capsanthin 5,6-epoxide, capsanthin 3,6-epoxide,
karpoxanthin, cucurbitaxanthin B, violaxanthin, cycloviolaxanthin, antheraxanthin, capsanthone, nigroxanthin, β-cryptoxanthin
and several cis isomers and furanoid oxides.
Received: 16 April 1997 相似文献