Effects of heat acclimation on hand cooling efficacy following exercise in the heat

This study examined the separate and combined effects of heat acclimation and hand cooling on post-exercise cooling rates following bouts of exercise in the heat. Seventeen non-heat acclimated (NHA) males (mean ± SE; age, 23 ± 1 y; mass, 75.30 ± 2.27 kg; maximal oxygen consumption [VO₂ max], 54.1 ± 1.3 ml·kg^?1·min^?1) completed 2 heat stress tests (HST) when NHA, then 10 days of heat acclimation, then 2 HST once heat acclimated (HA) in an environmental chamber (40°C; 40%RH). HSTs were 2 60-min bouts of treadmill exercise (45% VO₂ max; 2% grade) each followed by 10 min of hand cooling (C) or no cooling (NC). Heat acclimation sessions were 90–240 min of treadmill or stationary bike exercise (60–80% VO₂ max). Repeated measures ANOVA with Fishers LSD post hoc (α < 0.05) identified differences. When NHA, C (0.020 ± 0.003°C·min^?1) had a greater cooling rate than NC (0.013 ± 0.003°C·min^?1) (mean difference [95%CI]; 0.007°C [0.001,0.013], P = 0.035). Once HA, C (0.021 ± 0.002°C·min^?1) was similar to NC (0.025 ± 0.002°C·min^?1) (0.004°C [?0.003,0.011], P = 0.216). Hand cooling when HA (0.021 ± 0.002°C·min^?1) was similar to when NHA (0.020 ± 0.003°C·min^?1) (P = 0.77). In conclusion, when NHA, C provided greater cooling rates than NC. Once HA, C and NC provided similar cooling rates.     

高炉冷却水温差高精度检测系统的研究与应用

针对国内高炉冷却水温差检测系统测温精度不高的弊端,设计并开发了高炉冷却水温差高精度检测系统。检测系统由测温节点、温度采集终端与上位机构成,之间通讯采用RS-485,基于三线制Pt1000设计了比率电桥温度补偿电路,并结合A/D转换器AD7799,构成信号处理电路,提高了水温采集精度。     

Real-time temperature control for high arch dam based on decision support system

It is important and difficult to control the temperature of mass concrete structure during high arch dam construction.A new method with decision support system is presented for temperature control and crack prevention.It is a database system with functions of data storage,information inquiry,data analysis,early warning and resource sharing.Monitoring information during construction can be digitized via this system,and the intelligent analysis and dynamic control of concrete temperature can be conducted.This method has been applied in the construction of the Dagangshan Arch Dam in China and has proven to be very convenient.Based on the decision support of this system and the dynamic adjustment of construction measures,the concrete temperature of this project is well-controlled.     

Energy Performance and Condensation Risk of DCDV System in Subtropical Hong Kong简

The combined use of dry cooling （DC） system and dedicated ventilation （DV） system to decouple cool-ing and dehumidification process for energy efficiency was proposed for subtropical climates like Hong Kong. In this study, the energy performance and condensation risk of the use of DCDV system were examined by analyzing its ap-plication in a typical office building in Hong Kong. Through hour-by-hour simulation using actual equipment per-formance data and realistic building and system characteristics, it was found that with the use of DCDV system, the annual energy consumption could be reduced by 54%in comparison with the conventional system （constant air vol-ume with reheat system）. In respect of condensation risk, it was found that the annual frequency of occurrence of con-densation on DC coil was 35 h. Additional simulations were conducted to examine the influence of different parame-ters on the condensation risk of DCDV system. Measures to ensure condensate-free on DC coil were also discussed.     

A review on high power SOFC electrolyte layer manufacturing using thermal spray and physical vapour deposition technologies

Manufacturing of solid oxide fuel cell （SOFC） components remains nowadays a key point for the indus- trial development of this technology. Especially, the deposition of the dense electrolyte layer which is sand- wiched between the porous anode and the porous cathode is of paramount importance and thus focuses a lot of attention. Therefore, this paper considers and reviews recent developments concerning solid electrolyte layers manufacturing using thermal spray （TS） and physical vapour deposition （PVD） technologies.     

中枢性高热患者冰毯机降温与冰毯机加药物降温效果观察

目的：中枢性高热病人应用冰毯机加药物吲哚美辛栓肛门内给药降温的效果观察。方法：对中枢性高热病人在常规治疗基础上,分别采用冰毯机加药物吲哚美辛栓肛门内给药降温和冰毯机降温,比较两组病人降温效果。结果：两组病人降温效果差异有统计学意义（P〈0.05）。结论：冰毯机加药物吲哚美辛栓肛门内给药降温效果明显优于冰毯机降温。     

基于ANSYS的分级机主轴冷却系统的设计与分析

针对过热蒸汽气流磨在进行粉体加工时,高温的过热蒸汽会导致分级机主轴轴承温度高于额定工作温度,设计了一种能使分级机主轴有效降温的水冷却系统.以某型号的过热蒸汽分级机为原型建模,利用ANSYS软件,对其在自然冷却与所设计的水冷却系统下主轴系统的温度进行数值模拟分析,表明所设计的水冷却系统对分级机主轴系统具有良好的冷却效果.     

零污染零排放喷纳线路板的创新研究

喷纳线路板是一种零污染、零排放、全数字加工的线路板.不用覆铜板、不用腐蚀、不用水、不用感光显影、不用制网版就能将导电线路制作在树脂板、塑胶板、玻璃板、陶瓷板和PET、PI薄膜等绝缘材质上.经电路实测应用,完全达到使用标准.只需将CAD线路图输入线路板喷纳机,即可加工出线路板.非常适合电路实训,线路板设计制作现场演示教学,满足高新技术企业和科研机构对线路板快新奇特的要求.是线路连接领域的技术突破.     

汽化冷却烟道爆管的分析与研究

通过对汽化冷却烟道使用过程出现爆管时的追踪和分析,得出爆管主要有材质使用不当,水质不达标,设计不合理等原因     

低碳含磷冷轧高强钢的连续冷却转变试验

采用热模拟实验机测定了低碳含磷冷轧高强钢在奥氏体化温度900℃变形40%时,0.1℃/s～60℃/s的不同冷却速度的相变膨胀曲线,并测定了该钢的相变点,根据转变特征和膨胀法原理绘制了低碳含磷冷轧高强钢在动态条件下的连续冷却转变(CCT)图,从检测结果可以看到低碳含磷冷轧高强钢在奥氏体化温度900℃变形40%的条件下,以60℃/s的冷却速度,冷到200℃时,其组织几乎全部为贝氏体。随着冷却速度的增加,试样的显微硬度也增加。在冷却速率很慢的时候,只能看到铁素体相变而看不到有贝氏体相变的发生。并且随着冷却速率的增加,贝氏体转变温度趋于降低,贝氏体的形貌也发生了变化。