两道循环效率题的启示     

付清荣 《伊犁师范学院学报》2002,(1):86-88

由两道循环效率题的解答，总结计算循环效率时应注意的两个问题。  相似文献   

外墙保温对夏热冬冷地区住宅空调负荷的影响     

宁勇飞  刘泽华  陈刚 《怀化学院学报》2006,25(5):113-115

采用DeST软件,对夏热冬冷地区外墙保温的住宅进行了全年的能耗模拟,分析了不同外墙保温形式对住宅负荷的影响·  相似文献   

热休克蛋白7O在乳腺癌和胃癌中的表达及其意义的研究     

程毅 魏贵亮周宁  吴迎爽谢震 祁贺薄爱华  张晓立邢立强 《河北北方学院学报(医学版)》2005,22(5):23-24

目的：探讨热休克蛋白70（HSP70）在人乳腺癌和胃癌中的表达及其意义。方法：应用免疫组织化学的方法对64例乳腺癌和55例胃癌组织中的HSP70进行检测。结果：（1）HSP70在乳腺癌和胃癌组织中的表达分别为78．13％．61.82％。（2）乳腺癌中HSP70的表达与乳腺癌的病理类型．淋巴结转移情况及年龄未发现显著差异（P〉0．05）。（3）胃癌中HSP70的表达与肿瘤浸润深度、淋巴结转移有密切关系（P〈0．05）。结论：HSP70在乳腺癌和胃癌中均呈较高水平表达．其中在胃癌中的表达与肿瘤浸润深度、恶性程度有密切关系,HSP70在乳腺癌和胃癌的发生发展中起重要作用。HSP70可能成为乳腺癌，胃癌的诊断指标之一。  相似文献   

Numerical Simulation of Heat Transfer Characteristics of Horizontal Ground Heat Exchanger in Frozen Soil Layer     

王华军  赵军 《天津大学学报(英文版)》2007,13(3):200-204

At present ,during the design of ground source heatpump (GSHP) systems ,technical attention is always fo-cused on vertical borehole heat exchangers and surroundingsoil[1 ,2],butthe effects of their shallowhorizontal connect-ing pipes ,or horizontal ground…  相似文献   

Modeling water and carbon fluxes above summer maize field in North China Plain with back-propagation neural networks     

Qin Z  Su GL  Yu Q  Hu BM  Li J 《Journal of Zhejiang University. Science. B》2005,6(5):418-426

INTRODUCTION Dynamics of carbon and water vapor fluxesexchange between the atmosphere and the ecosystembiosphere, depend on complex and non-liner interplayamong physiological, ecological, biochemical andedaphic factors and meteorological conditions (Jarvis,1995; Leuning et al., 1995). There are many studiesquantifying the fluxes across different time and spacescales as well as assessing the environment con-straints on them by some kinds of biophysical orempirical models whose resul…  相似文献   

大体积混凝土污水处理工程的施工技术     

迟作进  杨宏延  刘介元 《辽宁科技学院学报》2003,5(3):34-36

为防止大体积砼产生裂缝，采用HE微膨胀剂与LNF泵送剂行之有效。同时应进行温度应力与浇筑长度验算和精心施工。  相似文献   

温度概念的热力学     

马青兰 《雁北师范学院学报》1994,(2)

热量是由温度来定义的,因而用热冷程度来定义温度就是不科学的.本文以热力学第一定律和第二定律为基础,用可逆热机的运转来建立温度概念.温度是体系的单一决定可逆热机效率的宏观可测性质.此一宏观可测性质的特征由可逆热机运转的三种情形可以明确地揭示出来.  相似文献   

Measurement of conversion efficiency of soft X-ray from 0.35μm laser-irradiated aluminum planar targets     

Shu-xi Ren  Hong-liang Ma Ph. D.  Rong-qing Yi  Shen-ye Liu 《上海大学学报(英文版)》2006,10(3):224-227

Conversion efficiency of soft X-ray from 0.35 μm pulse laser-irradiated aluminium planar target at laser intensities 10¹³–10¹⁵ W/cm² on the Xingguang-II facility (laser energy 5–90 J, focal spot ⊃ Ф 200 μm full width of half maximun (FWHM) 400–800 ps) was measured. A simple model was given to explain soft X-ray conversion efficiency. In this model, because of the heat conduction from the laser-heated spot, the conversion was very small at lower irradiance limit, while at higher limit it was bounded by the energy lost in blow off plasma. Consequently, at the laser intensity around 2×10¹⁴ W/cm², the X-ray conversion efficiency reaches a maximum. Project suppoted by Shanghai Leading Academic Discipline Foundation (Grant No. T0104), and Science Foundation of Shanghai Municipal Commission of Education (Grant No. 214680)  相似文献   

嗜水气单胞菌外分泌物的致病性   总被引：3，自引：0，他引：3  

邱德全  何建国  钟英长  江静波 《中山大学学报论丛》1996,(Z1)

该菌分泌物有溶血性、细胞毒性和肠毒素毒性，毒性实验证实嗜水气单胞菌外分泌物对小白鼠和中华鳖有较高的致死毒性．层析纯化得到的1种蛋白质有上述3种毒性和致死性．  相似文献   

用Mathematica计算机代数系统求解数理方程   总被引：1，自引：0，他引：1  

杜建明 《淮南师范学院学报》2002,4(2):19-21

用Mathematica4.0系统软件精确求解了具有定解条件的一维波动方程和一维热传导方程。  相似文献