93耐热保健饮品对人体热耐受性的影响

９３耐热保健饮品对人体热耐受性的影响１何骁生２陈胜２许瑞娜３汤平涛２邬堂春２贺涵贞２为探讨９３耐热保健饮品对热耐力、免疫功能的影响，将健康男性大学生６名〔年龄２３岁～２５岁，体重（５８±５）ｋｇ〕采用实验对象受试前后自身对照。以不同时相分三组：①对照...     

Phase change analysis of an underwater glider propelled by the ocean＇s thermal energy

The phase change characteristic of the power source of an underwater glider propelled by the ocean＇s thermal energy is the key factor in glider attitude control. A numerical model has been established based on the enthalpy method to analyze the phase change heat transfer process under convective boundary conditions. Phase change is not an isothermal process, but one that occurs at a range of temperature. The total melting time of the material is very sensitive to the surrounding temperature. When the temperature of the surroundings decreases 8 degrees, the total melting time increases 1.8 times. But variations in surrounding temperature have little effect on the initial temperature of phase change, and the slope of the temperature time history curve remains the same. However, the temperature at which phase change is completed decreases significantly. Our research shows that the phase change process is also affected by container size, boundary conditions, and the power source＇s cross sectional area. Materials stored in 3 cylindrical containers with a diameter of 38ram needed the shortest phase change time. Our conclusions should be helpful in effective design of underwater glider power systems.     

淹没射流清洗方式清洗物料的效果研究

为了研究淹没射流清洗机的清洗参数及清洗效果,研制了以淹没射流作为清洗动力的清洗试验机。通过蔬菜清洗试验,提出淹没射流清洗方式清洗效果的评价指标,并得出清洗品种和最大清洗量等清洗参数。分别研究小白菜和樱桃番茄的清洗效果,并根据试验观察结果,分析淹没射流清洗方式的优缺点。     

Prediction of thermal environment via revision of PMV index with body temperature

PMV （Predicted Mean Vote） is a widely used index for evaluating the thermal environment. However, few studies have been conducted to take physiological values directly as evaluating indices. This paper assumes a linear relation between body temperature and both sweating rate and heat produced by shivering, and introduces the linear relation into the human heat balance equation to revise the classic PMV. And the assumption of linear relation is subsequently proved. The revised PMV possesses the same characteristic of dependent heat load as that of the classic one, and moreover it is convenient to be calculated.     

Fe-Mn-Si基合金的形状记忆效应及腐蚀性

研究了预应变量、回复退火温度、热-机械训练工艺对Fe-30Mn-5Si、Fe-20Mn-5Si-5Cr-3Ni合金形状记忆效应的影响,同时研究了合金在HCl、NaOH和NaCl溶液中的耐腐蚀性.结果表明,合金的形状回复率随预变形量的增加而减小;形状回复率随回复温度的升高而增大,且在400℃～500℃之间达到较高值;热-机械训练可以明显提高合金的形状记忆效应.在Fe-Mn-Si基合金中加入适量的Cr、Ni元素可以显著提高合金的耐腐蚀性,对合金的形状记忆效应也有明显提高.     

中低温清洗剂的研制与应用

为了使电镀件表面处理及清洗时降低能源消耗、节约生产成本,从工艺上采用降低工作温度的方法,研制了中低温除油剂,并在电镀生产中得到应用。在该基础上派生出的防锈清洗剂在防锈清洗、铁路机车、车厢清洗等方面得到应用。     

清洗空滤DIY

车上的有些东西完全可以自己动手来搞定。例如清洗空滤和节气门、更换雨刷片等。这样一来不仅可以减少一部分养车费用，更重要的是还能体验一把DIY的乐趣。本期车体验课堂栏目，我们将告诉你如何自己动手清洗空滤[编者按]     

四冲程摩托车大修后要及时更换润滑油和清洗机油滤网

凡有经验的摩托车维修工,在四冲程摩托车大修后,一般都会提示驾驶员应在较短的时间内更换发动机润滑油和清洗机油滤网。有不少驾驶员不解其意,认为发动机刚大修好,清洗非常干净。     

一种用汽油燃烧系统模拟发动机台架催化剂热老化的方法

采用通用汽车公司的快速老化程序RAT-A，分别在FOCAS燃烧系统及发动机上对催化剂在老化前和老化后的性能进行对比试验。结果表明，FOCAS燃烧系统能够对催化剂进行和发动机类似的老化。与发动机台架试验相比，FOCAS系统有明显的优点，如严格地控制空燃比使其变化幅度很小、空燃比稳定运行的范围宽、活动部件少及易操作等。