吸收式制冷机传热面积的优化分析

研究热阴影响下吸收式制冷机传热面积的优化问题,导出制冷机的最佳制冷系数与制冷率和传热面积间的关系,以及里佳传热面积比,并应用这些结果对吸收式制冷机的一些优化性能作了讨论。     

降低量热器法试验台漏热量的设计研究

本文介绍在研制第二制冷剂量热器法试验台时选用合适的制冷量作为设计参数,可降低量热器漏热量,以提高试验台测试精度。经过试验验证,理论和实际测量相符合。     

台湾海峡海流输送的海洋热盐通量

根据台湾海峡断面实测海流和温盐资料，直接计算出夏季两个、冬季三个断面海流输送的海洋热盐通量。     

受限射流流场热量传递特性的实验研究

锅炉煤粉燃烧往往是通过煤粉与空气混合后喷射进入炉内卷吸高温烟气而预热、着火的,其着火过程的早晚与射流和烟气间的热量交换情况关系极大.而这种交换实质上就是射流流股与被卷吸的气流之间的质量、动量和热量传递的结果,在湍流情况下这三者之间是相互影响的.尽管对湍流射流的研究比较成熟,有大量的文献资料可以查阅,然而由于射流流场的复杂性,大多数结果很难直接应用于具体的实际情况.如上所述,要计算射流与卷吸气流间的热通量就是一件较困难的工作.有鉴于此,本文对受限平面射流流场进行了实验测定,以模拟炉内冷态流动情况,而重点放在射流流股与外卷吸气流间的热量传递过程的测量与计算.实验的具体做法是用热线风速仪和热电偶测定流场的速度、脉动速度、温度及温度梯度,并结合湍流单方程模型计算出射流流场的热流分布,尤其是扩散热流的分布.     

Cerebral ischemia is the main cause for the onset of heat stroke syndrome in rabbits

During the onset of heat stroke, rabbits displayed hyperthermia (42.8°C), and decreased cerebral perfusion pressure and decreased cerebral blood flow (as reflected by a prolonged cerebral circulation time) compared to those of normothermic rabbits. On the other hand febrile rabbits, during the fever plateau did not show the above responses, although they had a similar level of hyperthermia (42.4°C). The data support the concept that cerebral ischemia is the main cause for the onset of the heat stroke syndrome.The work reported here was supported by grants from the National Science Council (Taipei, Taiwan, Republic of China).     

化学势与粒子空间相关性

把化学势定义为系统中粒子间相互作用势阱的平均深度。当系统粒子间的相互作用吸引占优势时，化学势为负，否则为正。气体粒子的化学势与温度Ｔ、粒子密度ｎ的关系，可用维里展开表达。玻色气体相当于具有吸引势的经典实在气体，而费米气体相当于具有排斥势的经典实在气体。这种相当的“互作用势”不是源于动力学，而是源于统计相关性，是量子全同粒子对称性要求的结果。在力场中处与平衡的自由粒子系统从位置１到位置２粒子势能的变化必须由位置１到位置２粒子浓度的变化来补偿。     

小麦干燥过程中颗粒内部的扩散机理和有限元分析

本文在对传统扩散方程分析的基础上，综合考虑了谷物干燥中水分的蒸发和汽化对扩散过程的影响，并用二维有限元方法进行了理论推导和求解；该模型经实验验证，符合精度要求．     

The role of hsp70 in protection and repair of luciferase activity in vivo; experimental data and mathematical modelling

The stably transfected rat cell line HR24 expressing high levels of the inducible human hsp70 and its parental cell line Rat-1 were used for in vivo studies to analyse the role of hsp70 during thermal protein denaturation and the subsequent renaturation. In order to monitor denaturation and renaturation of a cellular protein in vivo, both cell lines were transiently transfected with firefly luciferase (Luc). The continuous monitoring of Luc activity during and after heat stress allowed a detailed analysis of the inactivation and reactivation kinetics in cells grown in monolayers. The aim of these studies was to distinguish a protective effect of increased hsp70 levels during heat shock-induced protein inactivation from a stimulation of reactivation. In this paper we show that in cells that are stably transfected with hsp70, thermal Luc inactivation decreased, and subsequent reactivation yielded higher activity levels, compared with the parental cells. The difference in early inactivation kinetics observed in the two cell lines suggests an immediate effect of the presence of an extra amount of hsp70 on enzyme inactivation. Using different mathematical models, the heat-induced inactivation and reactivation kinetics was compared with simulations of denaturation and renaturation. It is concluded that the model in which it is assumed that hsp70 is able to interact with partially denatured proteins, which did not yet lose their enzymatic activity, most optimally explains the experimental observations. Received 2 December 1998; received after revision 19 February 1999; accepted 18 March 1999     

隧道窑窑体散热与烧成温度和环境温度的关系

本文研究隧道窑窑体向外散热。研究结果表明,车间环境温度的变化对窑体散热损失的影响极小。找出了窑内制品烧成温度制度的变化对窑体散热损失影响的几个关系式,并可利用这些关系式实时计算窑体的散热损失。