海水淡化设备制造工艺研究

4500T/日大型不锈钢海水淡化设备制造在国内尚属首次,为保证设备制造的顺利和质量要求,本文对设备制造的工艺难点进行了研究,同时提出了解决方法。为批量生产大型不锈钢海水淡化设备提供了保证。     

基于遥感的绍兴市热岛效应研究

利用LandsatTM影像,根据亮温计算公式,由灰度数据反演绍兴城区亮温;并对反演结果进行处理得到城区热岛图。热岛特点表现为绍兴城区整体上呈一热岛分布区,形成岛屿状的高温区域,高温中心集中于城区。由于绍兴市广泛的水域分布,对城市热岛影响明显,表现出高温区域与低值区域交错分布,说明城市水域能有效地降低地表温度和缓解城市热岛。将热岛图与绍兴市地图结合,发现绍兴市城市热岛面积随着城市的发展而扩大,但强度没有明显的改变。     

气相色谱法研究有机化合物的蒸发热

本文用气相色谱法测定了几种烷烃同系物和脂肪醇类的蒸发热,并与文献 数据进行了对比,结果完全吻合,是一种快捷方便的测定方法．     

理想气体经历准静态过程中吸、放热问题的讨论

对理想气体经历准静态过程吸、放热问题的判断进行了详细的讨论 ,指出了在某一过程中热量的正、负可能会发生多次变化 ,并结合具体实例给出了判断过程热量正、负的方法     

热传导中的热波

讨论了几种线性情形下的热传导方程的局限性,在此基础上考虑到热传导方程中导热系数、比热容、密度与温度的关系,热传导方程变为非线性热传导方程,其解的行为与实际相符。     

居住区生活饮用水二次污染的原因与防治措施

从技术、管理两方面入手 ,对供水管道内壁腐蚀结垢及防腐衬里渗出物、管网末梢微生物再度繁殖、蓄水池 (箱 )设计和供水卫生管理不当等造成的生活饮用水二次污染情况进行了分析 ,提出了相应的防治措施     

Numerical investigation on the phase change of water-saturated porous media with thermosyphon

Numerical investigations were carried out to determine the coupled heat transfer of water-saturated porous media with a two-phase closed thermosyphon for soil freezing, and to examine the characteristics of the freezing heat transfer in the water-saturated porous media. The whole control volume includes the thermosyphon and the porous media. The two-dimensional governing equations for the water-saturated porous media are used. The conjugation of heat transfer between the thermosyphon and porous media is reflected through thermal balance between the thermosyphon and the porous media. The finite-difference method was used to solve the two-dimensional goverming equation, for the water-saturated porous media and the heat transfer characteristics of the thermosyphon, obtain the flow fields and the temperature distributions in the soil. This paper deals mainly with the effect of some factors (such as soil properties, climate and thermosyphon dimensions) on the heat transfer rate of the thermosyphon and the growth of the freezing front. The predictions of the present study agree well with the measured data.     

简谐激励下输流管的稳定性和混沌运动

Ｎｏｔａｔｉｏｎａｖｉｓｃｏｅｌａｓｔｉｃｃｏｅｆｆｉｃｉｅｎｔ Ａ ｃｒｏｓｓ ｓｅｃｔｉｏｎａｌａｒｅａｏｆｔｈｅｐｉｐｅｗａｌｌｄｄｉｍｅｎｓｉｏｎｌｅｓｓｆｏｒｃｉｎｇａｍｐｌｉｔｕｄｅＤｆｏｒｃｉｎｇａｍｐｌｉｔｕｄｅＥＩｆｌｅｘｕｒａｌｒｉｇｉｄｉｔｙｏｆｔｈｅｐｉｐｅｇ ａｃｃｅｌｅｒａｔｉｏｎｄｕｅｔｏｇｒａｖｉｔｙＬｌｅｎｇｔｈｏｆｐｉｐｅｍｓｐｅｃｉｆｉｃｍａｓｓｏｆｐｉｐｅＭｓｐｅｃｉｆｉｃｍａｓｓｏｆｆｌｕｉｄｎｄｉｍｅｎｓｉｏｎｌｅｓｓｆｏｒｃｉｎｇｆｒｅｑｕｅｎｃｙｔｔｉ…     

反抛物问题的H(o)lder型稳定性估计

This paper deals with a parabolic system in a multi-dimentional bounded domain Ω Rn with the smooth boundary Ω. We discuss an inverse parabolic problem of determining the indirectly measurable internal heat distribution at any intermediate moment from the heat distribution measurements in arbitrary accessible subdomain ωΩ at some time-interval. Our main result is the Holder stability estimate in the inverse problem and the proof is completed with a Carleman estimate and a eigenfunction expansion for parabolic equations.     

新型高温量热系统的研制和性能测试

报道了一套适用于高温条件下工作的新型量热系统,通过电能标定和氮气热沉的测定,证明该量热系统设计合理,工作正常,其性能符合Ｔｉａｎ’ｓ方程的要求,测量精度能满足工程需要。用该套仪器可测定各种吸热型碳氢在各种条件下的热沉,用于吸热型碳氢燃料的筛选,为吸热型碳氢燃料的研究提供可靠的热化学数据。用这套装置测定了吸热型碳氢燃料ＴＱ－７在不同工作温度下的热沉,与文献报道的接近,证明仪器可靠。