Heat strain experienced by individuals wearing chemical protective clothing(CPC)is severe and dangerous especially in hot-humid environment.The development of material science and interdisciplinary studies including e...Heat strain experienced by individuals wearing chemical protective clothing(CPC)is severe and dangerous especially in hot-humid environment.The development of material science and interdisciplinary studies including ergonomics,physiology and heat transfer is urgently required for the reduction of heat strain.The aim of this paper was to study the relationship among clothing thermal properties,physiological responses and environmental conditions.Three kinds of CPC were selected.Eight participants wore CPC and walked(4 km/h,two slopes with 5%and 10%)on a treadmill in an environment with(35±0.5)℃ and RH of(60±5)%.Core temperature,mean skin temperature,heart rate,heat storage and tolerance time were recorded and analyzed.Physiological responses were significantly affected by the clothing thermal properties and activity intensity in hot-humid environment.The obtained results can help further development of heat strain model.New materials with lower evaporative resistance and less weight are necessary to release the heat strain in hot-humid environments.展开更多
The current ventilation condition of the hot and humid regions was analyzed through on-site investigation. It is found that residents in this region expect to improve indoor thermal environment through natural ventila...The current ventilation condition of the hot and humid regions was analyzed through on-site investigation. It is found that residents in this region expect to improve indoor thermal environment through natural ventilation as much as possible. Then,it comes to a conclusion by the field test that natural ventilation has certain practical effect on improving indoor thermal environment. CFD simulation software is employed to verify the test result. Based on PMV modified model,and according to norms,geography and climate combined with the measured and simulated results,the application of the time and effectiveness of natural ventilation in hot and humid region were analyzed,to some extent,providing a basis for reducing the air-conditioner's runtime with natural ventilation.展开更多
The effect of hot-humid exposure(i.e., 40 C and 98% R.H.) on the quasi-static strength of the adhesive-bonded aluminum alloys was studied. Test results show that the hot-humid exposure leads to the significant decreas...The effect of hot-humid exposure(i.e., 40 C and 98% R.H.) on the quasi-static strength of the adhesive-bonded aluminum alloys was studied. Test results show that the hot-humid exposure leads to the significant decrease in the joint strength and the change of the failure mode from a mixed cohesive and adhesive failure with cohesive failure being dominant to adhesive failure being dominant. Careful analyses of the results reveal that the physical bond is likely responsible for the bond adhesion between L adhesive and aluminum substrates. The reduction in joint strength and the change of the failure mode resulted from the degradation in bond adhesion, which was primarily attributed to the corrosion of aluminum substrate. In addition, the elevated temperature exposure significantly accelerated the corrosion reaction of aluminum, which accelerated the degradation in joint strength.展开更多
夏秋茶资源的高效利用是茶产业可持续发展的关键问题,而传统加工方式难以兼顾茶叶蛋白功能活性和营养特性。该研究旨在揭示高温高湿气流冲击漂烫(high-humidity hot air impingement blanching,HHAIB)处理对茶叶蛋白-多酚复合物(tea pro...夏秋茶资源的高效利用是茶产业可持续发展的关键问题,而传统加工方式难以兼顾茶叶蛋白功能活性和营养特性。该研究旨在揭示高温高湿气流冲击漂烫(high-humidity hot air impingement blanching,HHAIB)处理对茶叶蛋白-多酚复合物(tea protein-polyphenol complexes,TPC)结构及功能特性的调控机制,并评价其作为姜黄素递送载体的应用潜力。采用不同漂烫处理时间(0~210 s)处理夏秋茶粉,通过FTIR、荧光光谱等技术表征TPC结构变化,并系统评价TPC-果胶复合物稳定的Pickering乳液性能。结果表明,150 s处理使TPC二级结构发生显著转变(α-螺旋向β-折叠转化),分子相互作用增强(荧光强度提升)。90 s处理抗氧化活性提高(DPPH和ABTS阳离子自由基清除率分别达32.07%和35.40%),所构建的乳液体系表现出优异的稳定性(包封率79.13%,热稳定性保留率>70%)和控释特性(肠阶段姜黄素保留率78.85%),最终生物可及性达67.78%,较对照组提高32.51%。该研究首次阐明了HHAIB处理通过调控蛋白质构象提升功能活性的分子机制,为开发基于茶叶蛋白的高效营养素递送系统提供了理论依据和技术支撑,对促进夏秋茶资源高值化利用具有重要意义。展开更多
文摘Heat strain experienced by individuals wearing chemical protective clothing(CPC)is severe and dangerous especially in hot-humid environment.The development of material science and interdisciplinary studies including ergonomics,physiology and heat transfer is urgently required for the reduction of heat strain.The aim of this paper was to study the relationship among clothing thermal properties,physiological responses and environmental conditions.Three kinds of CPC were selected.Eight participants wore CPC and walked(4 km/h,two slopes with 5%and 10%)on a treadmill in an environment with(35±0.5)℃ and RH of(60±5)%.Core temperature,mean skin temperature,heart rate,heat storage and tolerance time were recorded and analyzed.Physiological responses were significantly affected by the clothing thermal properties and activity intensity in hot-humid environment.The obtained results can help further development of heat strain model.New materials with lower evaporative resistance and less weight are necessary to release the heat strain in hot-humid environments.
基金Project(50838009) supported by the National Natural Science Foundation of ChinaProject(2006BAJ01A05) supported by the National Key Technologies R&D Program of ChinaProject(CSTC,2008AB7110) supported by Key Technologies R & D Program of Chongqing City,China
文摘The current ventilation condition of the hot and humid regions was analyzed through on-site investigation. It is found that residents in this region expect to improve indoor thermal environment through natural ventilation as much as possible. Then,it comes to a conclusion by the field test that natural ventilation has certain practical effect on improving indoor thermal environment. CFD simulation software is employed to verify the test result. Based on PMV modified model,and according to norms,geography and climate combined with the measured and simulated results,the application of the time and effectiveness of natural ventilation in hot and humid region were analyzed,to some extent,providing a basis for reducing the air-conditioner's runtime with natural ventilation.
基金funded by General Motors Global Research and Development Center(Grant No.:PS21025708)
文摘The effect of hot-humid exposure(i.e., 40 C and 98% R.H.) on the quasi-static strength of the adhesive-bonded aluminum alloys was studied. Test results show that the hot-humid exposure leads to the significant decrease in the joint strength and the change of the failure mode from a mixed cohesive and adhesive failure with cohesive failure being dominant to adhesive failure being dominant. Careful analyses of the results reveal that the physical bond is likely responsible for the bond adhesion between L adhesive and aluminum substrates. The reduction in joint strength and the change of the failure mode resulted from the degradation in bond adhesion, which was primarily attributed to the corrosion of aluminum substrate. In addition, the elevated temperature exposure significantly accelerated the corrosion reaction of aluminum, which accelerated the degradation in joint strength.
文摘为优化秋季纵向通风模式下的密闭式笼养蛋鸡舍热环境,通过计算流体力学(computational fluid dynamics,CFD)模拟当前蛋鸡舍的温度场、相对湿度场及空气流速场分布状况,对数值模型进行准确度验证,并通过17组正交仿真试验求解通风设备参数(前山墙隧道进气口导流板夹角θ_(1)、侧墙隧道进气口夹角θ_(2)、末端单个负压风机的通风量Q)处于3个不同水平时鸡笼区域的平均温度-湿度-风速指数(temperature-humidity-velocity index,THVI)及变异系数CVTHVI(coefficient of variation of THVI)。结果显示:笼间通道设置的24个验证点的温度、相对湿度和空气流速的平均相对误差分别为0.38%、0.52%、4.62%,数值模型准确度较高;而通风设备参数θ_(1)、θ_(2)、Q分别取值10°、90°、42 000 m^(3)/h时,鸡笼区域气流场平均THVI和变异系数CVTHVI分别为25.65和1.64%,相较原通风方案分别下降1.61%和23.93%,有利于提升蛋鸡舍鸡笼区域的热环境适宜度及均衡性。
文摘夏秋茶资源的高效利用是茶产业可持续发展的关键问题,而传统加工方式难以兼顾茶叶蛋白功能活性和营养特性。该研究旨在揭示高温高湿气流冲击漂烫(high-humidity hot air impingement blanching,HHAIB)处理对茶叶蛋白-多酚复合物(tea protein-polyphenol complexes,TPC)结构及功能特性的调控机制,并评价其作为姜黄素递送载体的应用潜力。采用不同漂烫处理时间(0~210 s)处理夏秋茶粉,通过FTIR、荧光光谱等技术表征TPC结构变化,并系统评价TPC-果胶复合物稳定的Pickering乳液性能。结果表明,150 s处理使TPC二级结构发生显著转变(α-螺旋向β-折叠转化),分子相互作用增强(荧光强度提升)。90 s处理抗氧化活性提高(DPPH和ABTS阳离子自由基清除率分别达32.07%和35.40%),所构建的乳液体系表现出优异的稳定性(包封率79.13%,热稳定性保留率>70%)和控释特性(肠阶段姜黄素保留率78.85%),最终生物可及性达67.78%,较对照组提高32.51%。该研究首次阐明了HHAIB处理通过调控蛋白质构象提升功能活性的分子机制,为开发基于茶叶蛋白的高效营养素递送系统提供了理论依据和技术支撑,对促进夏秋茶资源高值化利用具有重要意义。
