"气泡聚变"与冷聚变

论述了“气泡聚变”与冷聚变都属于新型聚变，指出中性粒子与核的聚变可在任何温度条件下进行，强调要用新观念与新思维来正确对待新奇核现象。     

城市民用建筑节能探讨

简要阐述了城市民用建筑节能的必要性，论述了节能应遵循的基本原则。提出民用建筑节能潜力不可估量,意义重大。     

An equation of entransy transfer and its application

Entransy is a physical quantity describing heat transfer ability, and heat transfer is accompanied by entransy transfer. Thermal energy is conserved in its transfer process, while entransy is dissipated because of the irreversibility of its transfer process. As a result, entransy transfer must have its rules which are different from those of thermal energy transfer. Based on the definition of entransy, an entransy transfer equation is derived, which describes the entransy transfer processes of a multi-component viscous fluid subject to heat transfer by conduction and convection, mass diffusion and chemical reactions. The expressions of entransy flux and entransy dissipation are obtained simultaneously, and their physical mechanism is clarified. And further, the theory and method of optimizing heat transfer applying the entransy transfer equation to the steady-state convection heat transfer process are expounded. The minimum thermal resistance principle and the entransy dissipation extremum principle are obtained by applying the steady-state entransy transfer equation to the steady-state convection heat transfer process. The cases of the single-component steady-state convection heat transfer and the steady-state heat conduction show the application of the theory and method.     

Applications of membrane distillation technology in energy transformation process-basis and prospect

Membrane distillation technology is a new type of efficient separation technology that combines traditional distillation technology and membrane separation technology. In the study, applications of membrane distillation technology in thermal engineering and refrigerating engineering with typical energy transformation process were presented. Desorption and regeneration process of saline solution by vacuum membrane distillation was proposed on the basis of the concentration and separation properties of membrane distillation. Membrane distillation technology could be used in lithium bromide absorption refrigeration system, energy storage system, and the regeneration process of liquid desiccant solution in temperature-humidity independent control air-conditioning system. The aim of the applications was to use the low-grade energy such as waste heat, solar energy and geothermal energy adequately and to improve the available temperature difference of heat source. According to latent heat transfer and thermal conduction across the membrane in direct contact membrane distillation process, a novel membrane heat exchanger with both heat transfer and mass transfer processes was proposed. The heat exchanger could be used as the solution heat exchanger of lithium bromide absorption refrigeration system and as the special heat exchanger that recovered heat and pure water simultaneously. Some feasible process flows about the applications of membrane distillation technology to energy transformation process were listed and analyzed. Finally, future research emphases were indicated.     

Entropy generation extremum and entransy dissipation extremum for heat exchanger optimization

The applicability of the extremum principles of entropy generation and entransy dissipation is studied for heat exchanger optimization. The extremum principle of entransy dissipation gives better optimization results when heat exchanger is only for the purpose of heating and cooling, while the extremum principle of entropy generation is better for the heat exchanger optimization when it works in the Brayton cycle. The two optimization principles are approximately equivalent when the temperature drops of the streams in a heat exchanger are small. Supported by Major State Basic Research Development Program of China (Grant No. 2007CB206901)     

Field synergy principle of heat and mass transfer

Simultaneous heat and mass transfer widely exists in nature and engineering, and it is of vital importance to enhance heat and mass transfer efficiency. In this paper, field synergy equation of heat and mass transfer is derived from its energy equation. Results show that the total transferred heat （including the conducted heat and the heat transferred by mass diffusion through the heat transfer interface） is determined by the values of fluid velocity and enthalpy gradient as well as the value of synergy angle α of velocity vector and enthalpy gradient field. Decreasing the value of α enhances the heat and mass transfer. This means the higher the synergy of velocity vector and enthalpy gradient field, the higher the total transferred heat. By the synergy principle of heat and mass transfer, some methods may be developed to improve the heat and mass transfer efficiency.     

N5H5的结构性能的量子化学研究

采用了密度泛函B3LYP方法在6-311++G**基组上对N5H5异构体进行了理论计算,得到7种稳定构型,应用自然键轨道理论(NBO)和分子中的原子理论(AIM)分析了这些异构体的成键特征、相对稳定性. N-N键的键长与键临界点的电荷密度存在线性关系,键临界点的电荷密度ρ越大,N-N键的键长就越短. N原子孤对电子与相邻的氮氮键之间的相互作用是影响氮氮键长变化的主要因素. 立体交换排斥能和离域化能是影响异构体相对稳定性的重要因素. G3MP2计算结果表明所有异构体的生成热均为正,环状异构体的能量和生成热高     

一种城市热岛强度的计算方法——以合肥市为例

城市热岛是指城市化过程中城区高空以及近地面大气温度高于城区以外郊区的现象。城市热岛强度是城市热场分布的重要表达手段,目前,对专门研究城市热岛强度的计算方法讨论较少。本文利用Landsat5数据,基于遥感相关理论,以合肥市为例,反演出城市地表亮温,同时引入城市形态分维理论,使用改进的半径法对合肥市的城市热场状况进行研究,发现亮温的水平分布在城市建成区与非城市建成区间有突变现象,并以此分析城市热力场的空间分布,得到热岛强度计算公式,从而得出城市热岛强度的表达方式。在城市热岛强度计算过程中,着重考虑了城市热场分布特征,克服了在研究城市热岛时寻找郊区气温值的困惑,这对于城市热岛强度的表达研究具有一定的指导意义。     

杭州湾地区生态-气候监测预警系统及其应用

基于3S技术、中尺度模式及动态植被模式建立了生态-气候监测预警系统,其中包括4个子系统:土地覆盖动态监测系统、城市热岛动态监测系统、城市气候监测系统和植被NPP模拟与监测系统.利用土地覆盖监测系统可以精确地获取各种土地覆盖类型,并分析土地利用覆盖变化;利用土地覆盖监测系统结果、Landsat-TM红外影像及常规气象资料构建城市热岛监测系统,分析该地区城市热岛效应的时空变化:利用土地覆盖分类结果,对改变下垫面进行敏感性试验,模拟城市发展对城市气候的影响,构建城市气候监测系统:利用LPJ模拟杭州湾地区植被NPP及对气候变化的响应,构建植被NPP模拟与监测系统.生态预警系统可以实时监测土地覆盖、城市热岛、城市气候、植被NPP变化.对保护耕地资源、改善生态环境、提高城市人居环境、合理利用气候资源、保持农林业的可持续发展有着重要的指导和现实意义.     

泡沫金属的热分析

提出了一种高孔隙率开孔泡沫金属的结构简化几何模型,运用热电比拟理论在胞孔尺度上分析并求解了有效热导率的计算表达式,并根据已有实验数据进行模型修正.同时模拟分析了金属泡沫三维矩形通道内空气流动的对流换热情况,与实验结果进行了对比验证.研究表明,本文提出的胞孔有效热导率修正模型对铝泡沫金属有一定的适用性;相同孔隙率条件下,泡沫金属通道内强制对流的对流换热系数随孔密度的增加(即孔径的减小)而增大,但付出的代价是阻力也随之增大;相对而言,低孔密度的泡沫金属具有较好的对流换热综合性能.