共查询到20条相似文献,搜索用时 46 毫秒
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电子商务流程的易变性对工作流系统提出了增加柔性的要求.文章提出了一种基于电子商务的柔性工作流系统结构,并给出了其在电子商务中的一个具体应用网上购物的例子. 相似文献
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通过对紫铜基体采用超音速喷涂自溶性合金并进行热处理,使紫铜与自溶性合金界面产生微冶金结合区,从而增强结合力。 相似文献
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Ren Rui Zhao Beijun Zhu Shifu He Zhiyu Wang Ruilin Wen Cai Ye Linsen Zhong Yuhang Zhu Xinghua 《中国稀土学报(英文版)》2006,24(Z1)
The surface treatments on CdSe wafers were studied by means of SEM, XPS and micro-current test instrument. The relations between electrical properties of CdSe wafers and surface topography, composition and structure were analyzed. The results show that the change of surface composition by etching is beneficial to decrease leakage current. Meanwhile, the increase of oxygen on surface caused by passivation can largely decrease leakage current. When passivating time is 40 min, the wafers surface appears smooth and compact, which will decrease the density of surface state, the optimal electrical property of the wafer is therefore obtained. 相似文献
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Comments on J. Radford's (see record 1974-26503-001) reflections on introspection as event and process and argues that they reflect prevalent misconceptions and distortions of the behaviorist view of the status of introspection in psychological inquiry. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
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为解决宝钢1550mm冷轧厂酸轧机组硅泥产生的喷射梁和石墨加热器等设备的堵塞问题,新工艺要求在酸洗液中加入絮凝剂以加速硅泥的沉降.文章就絮凝剂对冷轧乳化液的影响进行了研究,考察絮凝剂对乳化液的破坏作用,寻找对乳化液产生负面影响的絮凝剂浓度,研究在酸洗液中加入絮凝剂对乳化液的影响程度. 相似文献
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袁红氢 《湖南冶金职业技术学院学报》2004,(1)
随着信息技术的迅速发展,远程教育凭借其自身的优势必将是教育的又一次革命。通过ASP3. 0技术和Access 2000数据库技术相整合,可动态地从数据库中随机取得试题,实现远程在线考试。 相似文献
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《Canadian Metallurgical Quarterly》1954,9(2):77
Alist of 11 "troublesome, unanswered questions about gifted children, questions for which the lack of experimental answers is probably directly interfering with such children's receiving optimum guidance in homes, schools, and the community." (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
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黄铁矿制酸烧渣冶金提纯试验研究 总被引:2,自引:0,他引:2
文章介绍了以广西某厂黄铁矿制酸烧渣为原料所进行的几种处理工艺的试验情况,其中以氯化湿法工艺效果最佳,不仅能有效回收其中的有价金属,而且可以产出合格的铁精矿. 相似文献
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谢大吉 《Canadian Metallurgical Quarterly》2011,21(2)
阐述了基于PPTP的VPN(Virtual Private Network)的相关概念、工作原理以及在阿姆瑞特防火墙上的具体实现. 相似文献
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In this report, we review data dealing with radiation effects on cartilage. More specifically, we emphasize on alterations caused in the extra-cellular cartilage matrix. Although radiation studies predominantly describe the effect on the structure of DNA and on the mitotic activity of cells, alterations caused by the effect on the non-mitotic activity can also be important. Cartilage, having an extracellular matrix composed of 2 major components, aggrecan and collagen, provides a good model to study this kind of radiation effects. The following topics concerning literature data are summarized: effects on the amount of matrix synthesized, effects on the activity of certain enzymes and effects on the structure and morphology of the matrix. Some new findings concerning the radiation effect on the size distribution of aggrecan-aggregate populations, de novo synthesized by chondrocyte cultures, either derived from calcifying or from non-calcifying cartilage, are given. 相似文献
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初步研究了非自由表面大块单晶A1及大块晶体Pb的过热.主要介绍通过有效的方法制得试样,用DSC-7准确测量出在包覆状态下大块单晶Al及大块晶体Pb的过热度,从而得出大块晶体过热的必要条件. 相似文献
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高炉冶炼过程是一个大时滞、强非线性的系统,现有的高炉炉温预测模型不够准确,因此,建立了基于香农熵的广义相关系数时滞分析模型和基于样条变换的非线性偏最小二乘回归(ST-PLS)的反应炉温的参数预测模型,得出影响高炉炉温的主?问闹秃笫奔洌げ獬瞿芄蛔酆戏从Ω呗碌?个参数([Si],[S],铁还原速率及铁水温度)。试验证明,模型具有较高的预测精度,当相对误差分别为0.11和0.18时,模型预测[Si]的命中率分别为0.7143和0.9184,[S]的命中率分别为0.7347和0.9184,铁还原速率的命中率分别为0.6122和0.8163,铁水温度的命中率分别为1.0000和1.0000。 相似文献
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G. A. Gogotsi 《Powder Metallurgy and Metal Ceramics》1999,38(3-4):186-192
Micro-Raman studies have been made on zirconium dioxide ceramics and crystals by the use of argon and helium-neon lasers.
The Raman results for the crystals are appreciably affected by the wavelength, which is due to a luminescence spectrum more
intense than the background (this is not usually characteristic of zirconium dioxide ceramics). When a crystal is indented,
the monoclinic phase is detected only near the edges of the indent, so that process cannot be the cause of the rise in the
surface around the indent. It is concluded that the crystals differ from the ceramics in that the monoclinic-tetragonal transition
is not the mechanism that governs the mechanical behavior.
Strength Problems Institute, Ukraine National Academy of Sciences, Kiev. Translated from Poroshkovaya Metallurgiya, Nos. 3–4(406),
pp. 88–96, March–April, 1999. 相似文献
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从施工图预算的角度浅谈工程造价的控制 总被引:1,自引:0,他引:1
详细论述了施工图预算的编制方法和依据,以及审核施工图预算的技巧,并从施工图预算的角度对工程造价进行了较为详细的分析,指出合理地进行施工图预算是控制工程造价的重要手段。 相似文献
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RFID系统内通信的安全性已经受到了用户的关注。由于低成本标签无法执行对称和非对称密码算法,为安全方案的设计造成了很大的困难。目前常见的安全方案采用Hash函数为RFID系统内通信提供保护。总结了一些常见的RFID安全协议,并分析了它们的安全性,为以后的研究奠定了基础。 相似文献