排序方式: 共有173条查询结果,搜索用时 16 毫秒
71.
针对北京新机场线一期工程进行通风空调智能化控制系统的应用设计,分别从控制系统、控制工艺两方面进行论述。控制系统设计角度:通过对常规系统设计现状调研与分析,提出一套适用于新机场线的控制架构,并对系统架构、系统组成等方面进行论述;控制工艺设计角度:分别从负荷预测、风机模式控制、供冷模式控制、冷源效率控制等方面进行论述,形成一套完整的控制工艺流程。旨在通过对新机场线智能化控制系统的设计与应用,为后期线路提供通风空调系统的设计与建设经验。 相似文献
72.
在电厂建设等涉及大型特殊物件运输的项目中,按常规荷载等级设计的旧石拱桥,其承载力已难以满足特殊荷载通行的要求.以沙河桥为例,介绍了用钢丝网、钢纤维增强钢筋砼(简称三钢砼)与环氧砂浆粘贴钢板的复合加固措施,解决了大件运输中240 t重件通过的技术问题. 相似文献
73.
热过负荷保护在牵引变压器保护中的应用 总被引:1,自引:0,他引:1
提出了一种应用于牵引变压器的热过负荷保护,具有真实反映变压器热过负荷情况、计算变压器热积累、根据实际的热积累情况决定跳闸或告警时间等特点。此热过负荷保护通过对负荷电流的计算得到变压器的温升情况。理论分析及现场运行表明:该保护性能良好,作为变压器的过热保护,以达到延长绝缘寿命,提高变压器运行效益的目的。 相似文献
74.
75.
文章针对修船企业外包业务管理的特点,阐述了如何应用计算机技术辅助外包业务管理的思路和具体的方案设计,以规范企业的外包业务管理,提高管理的效率。 相似文献
76.
介绍面向对象编程方法,阐述用其方法完成列车运行图的绘制过程,并且介绍列车运行图编制系统中所涉及的各种问题及解决方法. 相似文献
77.
78.
79.
Jian-bing Ma Yu-ming Zhang Xiang-dong Meng Miao Liu 《西安交通大学学报(英文版)》2009,21(1):67-70
Objective To analyze the cause of prosthesis loosening by observing the interface membranes harvested during the hip restoration operation. Methods A total of 28 specimens of interface membrane around the loose prosthesis were harvested from 28 patients undergoing the restoration of total hip replacement. All the specimens underwent the observation of appearance, light microscopy and scanning electronic microscopy(SEM). Results All the gaps around the loose prosthesis were filled with interface membrane of different thickness. The color of the most interface membrane was madder red, and the other one third of membrane was black. The comparatively thicker membrane was similar to scar connective tissue while the thinner was similar to fiber membrane. A large number of wear debris, macrophages and foreign-body giant cells were found under light microscope. With SEM observation a large number of different diameter collagen fibra structures that looked like scar tissues were arranged disorderly in a great mass, foreign particles and bone debris of different size were distributed unevenly, and the fibroblast was distributed in the collagen fiber. Conclusion Wear debris is related to inflammatory cell response around the interface membrane of the loose prosthesis. The wear debris engulfed by macrophage stimulates the interface membrane to release bone resorption factors (such as TNF) which lead to osteolysis, and this is one of the most important causes of the prosthesis loosening. 相似文献
80.