双壁钢围堰吸泥下沉、清基及水下封底过程中有关问题的处理办法   总被引：3，自引：0，他引：3  

袁翀  傅勇 《黄冈师范学院学报》2001,21(5):83-85

系统概述了介绍芜湖长江大桥11号主墩双壁钢围堰吸泥下沉、清基及水下封底过程和应注意的事项及有关问题的解决办法。  相似文献   

Three dimensional couette flow and heat transfer through a porous medium with variable permeability     

Chaudhary?R.?C.?Email author  Sharma?Pawan?Kumar 《浙江大学学报(A卷英文版)》2003,4(2):181-185

This paper reports research on the effects of variations in injection velocity and permeability on the heat transfer and flow through a highly porous medium between two horizontal parallel plates situated at constant distance with constant suction by the upper plate. Due to this type of variation in injection velocity and in permeability the flow becomes three dimensional. The governing equations are solved by adopting complex variable notations to obtain the expressions for the velocity and temperature field. The skin-friction along the main flow direction and rate of heat transfer are discussed with the help of graphs.  相似文献   

8例机械通气且口腔分泌物过多患者的护理体会     

明州彦  杨小凤 《大众科技》2015,(3):101-102

文章针对使用呼吸机且口腔分泌物过多的患者,为有效预防呼吸机相关性肺炎、口腔感染,采用一次性组合式吸痰管持续吸引口腔分泌物及口腔冲洗,取得良好疗效。  相似文献   

闭式引流配合榄香烯乳、顺铂治疗恶性胸腔积液疗效观察     

王爱和  徐千朗 《泰州职业技术学院学报》2004,4(3):43-44

目的观察闭式引流配合榄香烯乳、顺铂治疗恶性胸腔积液的近期疗效及毒性。方法行胸腔闭式引流后，向胸腔内灌注榄香烯乳300mg，顺铂60mg 1次／周，连用1—3周。结果恶性胸腔积液完全缓解率为68．4％，总有效率为92．1％。副作用为轻度恶心，一过性胸痛、发热。结论闭式引流配合榄香烯乳、顺铂治疗恶性胸腔积液效率高．毒副反应小．值得临床推广。  相似文献   

Effects of operative conditions on membrane fouling of jet loop membrane bioreactor     

徐高田  孙佳琳  秦哲  阮慧娟 《上海大学学报(英文版)》2010,14(4):251-254

The orthogonal experiments, which involves three factors： aeration intensity, suction time and suction suspended time, were designed to research membrane fouling of jet loop membrane bioreactor （JLMBR）. Experimental results indicate that increasing aeration intensity, reducing suction time and increasing suction suspended time all could mitigate membrane fouling effectively. However excessive aeration intensity, too short suction time and excessive suction suspended time were bad for bioreactor running. The optimal aeration intensity, suction time and suction suspended time were 0.75 1.00 m3/（m2.h）, 8 -10 min and 4 -5 min, respectively. The three factors all had effect on membrane pollution rate, while the suction time was the most important one and followed by aeration intensity and suction suspended time. It also indicates that, comparing with traditional submerged membrane bioreactors, JLMBR had lower membrane pollution rate.  相似文献   

Moisture Adsorption Mechanism of Earthen Plaster Containing Soluble Salts in the Mogao Grottoes of China     

Fengjie Li  Xudong Wang  Qinglin Guo  Bo Zhang  Qiangqiang Pei  Shanlong Yang 《文物保护研究》2013,58(3):159-173

ABSTRACT

In the Mogao Grottoes of Dunhuang, China, the ambient relative humidity (RH) fluctuation in the caves is the main cause for the deterioration that has been observed, especially the deterioration of the earthen plaster and wall paintings linked to the presence of NaCl and Na₂SO₄ salt contaminants. To help identify the mechanism responsible for this salt-related deterioration and provide a theoretical basis for the development of a preventive conservation regime, this study addressed the basic moisture adsorption mechanisms of earthen plaster with soluble salts by taking an experimental approach. It is shown that, as ambient RH increases, the moisture adsorption process of the plaster containing the soluble salts can be regarded to have three basic stages, as evidenced by the results of the moisture adsorption tests performed on earthen plaster samples with different NaCl or Na₂SO₄ contents at various humidity levels. The moisture adsorption mechanism and its determining factors at each stage are also analysed. In addition, it is suggested that the hygroscopicity of the plaster structure and the interaction between the different kinds of salts in the plaster, which makes the dissolution or hydration of the salt in the plaster pores much easier, should be considered more seriously regarding increases in the ambient RH in the caves.  相似文献   

新集二矿210108工作面试采期瓦斯治理技术研究     

李虎 《黑龙江科技信息》2013,(26):134+178-134,178

为探求淮南区域1煤层瓦斯治理技术,对新集二矿1煤层首采工作面采取了不同的瓦斯治理手段,通过分析比较工作面回采期间风排瓦斯、底板巷高负压抽采瓦斯、高抽巷抽采瓦斯、风机巷顺层孔抽采瓦斯以及采空区埋管抽采瓦斯,初步得到用于新集二矿1煤层瓦斯治理有效的技术手段,以为以后1煤层的安全开采提供参考。  相似文献   

水轮机吸出高度影响因素的定性分析   总被引：2，自引：0，他引：2  

刘宇 《长江工程职业技术学院学报》2005,22(1):28-29

吸出高度计算是水轮机选型设计中一项重要工作.回顾了当前水轮机吸出高度的计算方法,对影响水轮机吸出高度的诸因素进行了定性分析.  相似文献   

Numerical Analysis of Soil Plug Inside Suction Foundations During Suction Penetration by Discrete Element Method   总被引：2，自引：1，他引：2  

杜杰丁红岩  张浦阳张超 《天津大学学报(英文版)》2006,12(1):61-65

The phenomenon of the soil plug usually rising inside the suction foundations during suction penetration was quantitatively described and predicted. The formation process of the soil plug was simulated and calculated by DEM （discrete element method） model. The seepage flow, the self-weight of soil, the friction on the chamber wall as well as the suction inside the chamber are considered as the main external forces in the process. The results are compared with a set of laboratory model tests performed by using three soil types （sand, silty clay and clay） in the Bohai Sea area. The heights of soil plug from numerical estimations are lower than those from model test results, mainly because the suction pressure and friction resistance are applied in an ideal way under the numerical simulation.  相似文献   

试论Bi和Ti对铸铁焊条焊接性能的影响     

黎仕增  甘善泽  杨浩佩 《南宁职业技术学院学报》2013,18(2):94-96

在普通铸铁焊芯的成分中添加适量的Bi元素和Ti元素,通过真空吸铸法制得的铸铁焊芯,外涂石墨化药皮,获得微合金化铸铁同质焊条,采用手工电弧焊法对铸铁进行补焊,结果发现与传统的铸铁芯同质焊条Z248相比,微合金化铸铁同质焊条的焊接性能更加优良。  相似文献