Numerical study on thermal behavior of classical or composite Trombe solar walls

It is very difficult to calculate and analyze with precision the thermal behavior of the walls of building envelope when coexist various modes of thermal transfer and because of the particularly random climatic phenomena. These problems are very complex in the case of special components such as passive solar wall used in “bio-climatic” architecture. In this paper, the thermal performances of passive solar systems, a classical Trombe wall and a composite Trombe–Michel wall, are studied. The models were developed by our cares with the finite differences method (FDM) [L. Zalewski, S. Lassue, B. Duthoit, M. Butez, Study of solar walls—validating a numerical simulation model, International Review on Building and Environment, 37 (1) (2002) 109–121], and with TRNSYS software [Solar Laboratory of energy (USA), Manuals of TRNSYS, University of Wisconsin-Madison, USA, 1994]. The model for a composite wall developed with FDM was validated by experimentation [1]. The comparisons between the results of simulation with TRNSYS [2] and with FDM, and between the results of simulation a classical Trombe wall and the results of simulation and a composite Trombe wall have been made. They show that the models developed by ourselves are very precise, and the composite wall has better energetic performances than the classical wall in cold and/or cloudy weather.     

AutoCAD生产平台与GIS系统交互研究

测绘地理信息生产环节正由简单的图形编绘向信息数据采集生产转换,需要考虑多源数据叠加的综合生产,在Auto CAD生产平台中若能调用GIS系统的影像及地图服务,将极大地丰富基础数据来源,为数据生产提供便利。通过Auto CAD生产平台直接调用Arc GIS Sever的切片地图缓存实现了交互,并重点介绍了客户端缓存图片的计算、自动刷新检测以及显示和缓存机制。     

亚慢性烟雾暴露对大鼠肺脏蛋白组学的影响

  目的  应用蛋白组学技术筛选卷烟烟气暴露诱导的大鼠肺脏差异表达蛋白,探讨长期吸烟对大鼠肺脏损伤的分子作用机制。  方法  雄性Sprague Dawley（SD）大鼠经烟雾暴露染毒90天,采用串联质谱标签（tandem mass tag,TMT）标记蛋白组学技术筛选大鼠肺脏差异表达蛋白,应用生物信息学软件对差异表达蛋白进行分析。  结果  与对照组比较,染毒组大鼠肺脏差异表达1.2倍以上的蛋白有133个,其中99个表达上调,34个表达下调。差异表达的蛋白主要参与602种生物学过程,131种细胞成分,158类分子功能,以及21条信号转导通路。  结论  雄性大鼠经烟雾暴露90天对肺脏组织的氧化还原过程和肌肉组织有影响,调控多种疾病的信号通路。      

三峡水电站过机水流指标检测下的水轮机磨蚀机理浅析

对三峡水电站左岸过水轮机水流的各项物理指标以及水轮机的磨蚀状况进行了监测,并以测得的各项物理指标与水轮机的真实磨蚀状况为基础对水轮机的磨蚀机理进行了浅析。分析得出了通过现场观察,数值模拟等手段可以较为准确的预测水轮机未来的磨蚀情况,也可为检修机制的转变提供依据。     

炼铜诺兰达炉用镁铬砖损毁机理的探讨

简要介绍了诺兰达炉用耐火材料的现状,并以风口区使用后的镁铬残砖为试样,采用化学分析、SEM和EDAX等手段对其侵蚀机理进行了分析研究。结果表明:铜渣对镁铬耐火材料的侵蚀,在工作面以熔蚀为主;在砖体内部主要以锍渗透为主。锍渗透的主要途径为开口气孔、晶界及微裂纹。     

遗传算法在土钉支护结构优化设计中的应用

以土钉支护的极限平衡设计方法为基础 ,用遗传算法作为计算工具 ,提出了土钉支护的优化设计方法 ,并对计算过程进行了编程。工程实例计算表明 ,该方法是进行土钉优化设计的有效方法。     

坑底搅拌桩和树根桩复合结构用作基坑竖向斜支撑基础

斜支撑是基坑围护体系的一种常见形式。通过实例介绍了一种采用坑底搅拌桩和树根桩复合结构作为基坑竖向斜支撑基础的具体做法 ,并提出了有关设计与施工的参数确定方法     

国内外部分白肋烟烟叶中非挥发性有机酸、高级脂肪酸、生物碱及pH值的对比分析

测定了10种国产白肋烟和8种进口白肋烟的非挥发性有机酸、高级脂肪酸、生物碱含量及水溶液的pH值。结果表明,国产白肋烟中非挥发性有机酸、高级脂肪酸和生物碱的含量明显高于进口白肋烟。但国产白肋烟的pH值显著低于国外样品。对国产白肋烟的加料处理技术,从理论上做一定的探讨。      

阿维菌素和氟铃脲二元混剂的分析方法研究

采用反相高效液相色谱外标法对阿维菌素、氟铃脲分别进行定量,此方法的标准偏差阿维菌素为0．0063,氟铃脲为0．0075,变异系数阿维菌素为1．13％,氟铃脲为0．29％。回收率阿维菌素为98．21％-101．82％,氟铃脲为99．61％～100．40％。     

Molecularly imprinted polymer membranes for substance‐selective solid‐phase extraction from aqueous solutions

Thin‐layer molecularly imprinted polymer (MIP) composite membranes for selective binding of monocrotophos (MCP) pesticide from aqueous solutions were developed. The procedure was based on commercially available membrane modules that were rinsed with prepolymerization imprinting mixtures. After the in situ polymerization and generation of MIP films on the membranes within the modules, the membranes were evaluated in terms of affinity toward the target molecule MCP. MIP membranes with different porogens and different monomers on Nylon‐6 membranes were prepared. It was shown that MIP membranes synthesized with methacrylic acid as monomer and toluene as porogens on the Nylon‐6 membranes provided a highly selective binding of MCP from aqueous solutions under the optimized elution conditions. With the novel surface modification technique, the low nonspecific binding properties of the microfiltration membrane could successfully be combined with the receptor properties of molecular imprints, yielding substance‐specific MIP composite membranes. The high affinity of these synthetic membranes to MCP pesticide together with their straightforward and inexpensive preparation could be applied in a fast preconcertration step, solid‐phase extraction, by a simple microfitration for the determination of MCP in water. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 101: 4468–4473, 2006