多门窗建筑风压驱动自然通风数值模拟
作者:
赵福云;申广;刘科君;王汉青;寇广孝
期刊:
湖南工业大学学报 ,2017年31(6):1-7 ISSN:1673-9833
作者机构:
湖南工业大学土木工程学院,湖南株洲 412007;武汉大学动力与机械学院,湖北武汉 430072;湖南工业大学土木工程学院,湖南株洲,412007;南华大学土木工程学院,湖南衡阳 421001;[王汉青; 刘科君; 赵福云; 申广; 寇广孝] 湖南工业大学
关键词:
多门窗;自然通风;计算流体动力学;风压通风
摘要:
采用计算流体动力学方法对多门窗建筑风压通风过程进行数值模拟.首先,通过与经典实验结果进行校验计算,验证了计算流体动力学程序的可靠性;接着,对建筑贯流通风不同的开口工况进行了深入分析和计算,并探究室内空气流动的物理机制;最后,讨论并且分析速度矢量、速度大小、速度分量、压力分布、压力系数等结果,讨论入口风速对于建筑室内通风流场的影响.模拟结果发现,建筑贯流通风存在侧面通风口时,背风面的出风口也可能作为进风口.
语种:
中文
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辐射供冷空调系统的研究综述
作者:
廖买利;谢东;丁伟;刘金芝;田伶
期刊:
湖南工业大学学报 ,2017年31(2):23-27 ISSN:1673-9833
作者机构:
南华大学土木工程学院,湖南衡阳,421001
关键词:
辐射供冷空调系统;传热理论;供冷性能;舒适性;结露
摘要:
在对辐射供冷空调系统国内外研究现状概述的基础上,提出了辐射供冷空调系统研究中存在的一些问题,并对辐射供冷空调系统的发展进行了探讨和展望.
语种:
中文
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基于改性巴斯德杆菌的桥梁环境下细菌混凝土技术的研究
作者:
鲁林;王兴赟;李栋;李继德
期刊:
黑龙江交通科技 ,2017年40(6):130-131 ISSN:1008-3383
作者机构:
南华大学铀矿冶生物技术国防重点学科实验室,湖南衡阳 421001;南华大学土木工程学院,湖南衡阳 421001;南华大学核资源工程学院,湖南衡阳 421001;南华大学机械工程学院,湖南衡阳 421001
关键词:
巴斯德杆菌;改性菌株;桥梁环境;深度修复
摘要:
选择巴斯德杆菌进行培育及矿化实验,并在亚硝酸盐溶液的环境下对其进行改性,筛选出了适合混凝土环境、产生碳酸钙和胶质物最多的巴斯德杆菌菌株M102。然后进行粉砂固化能力的对照实验,扫描电镜分析结果表明新菌株M102对粉砂的固化能力远大于原始巴斯德杆菌。
语种:
中文
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不同形貌镁铝水滑石的可控合成及其对氯离子的吸附性能
作者:
柯国军;张琳;阳鹏飞;赵海东;谭弘俊
期刊:
精细化工 ,2017年34(10):1107-1113 ISSN:1003-5214
通讯作者:
Zhang, Lin(552410089@qq.com)
作者机构:
[柯国军; 张琳; 赵海东; 谭弘俊] School of Civil Engineering, University of South China, Hengyang, Hunan, 421001, China;[阳鹏飞] School of Chemistry and Chemical Engineering, University of South China, Hengyang, Hunan, 421001, China
关键词:
镁铝水滑石;形貌;吸附;氯离子;功能材料
摘要:
以硝酸镁、硝酸铝为原料,尿素为沉淀剂,采用水热法在不同条件下合成了不同形貌的镁铝水滑石LDH-1、 LDH-2、LDH-3。通过SEM、XRD、BET和EDS对合成的样品进行了表征;考察了不同形貌水滑石及其焙烧产物(LDO-1、LDO-2、LDO-3)对溶液中氯离子的吸附性能。结果表明:采用水热法添加乙二醇可合成棒状镁铝水滑石(LDH-1),添加乙醇可合成片状六边形镁铝水滑石(LDH-2),添加四丙基氢氧化铵可合成立方体镁铝水滑石(LDH-3)。其中,LDH-2形貌规整均一,片间形成交叉支撑结构,比表面积为115.311 m~2/g,在室温条件下,其对氯离子的最大吸附量为24.72 mg/g。LDO-2吸附氯离子的最优操作条件:温度为35 ℃,pH值为8,焙烧温度为450 ℃。在此条件下,焙烧产物(LDO-2)吸附氯离子的能力大大增强,最大吸附量为96.07 mg/g。
语种:
中文
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葡甲胺改性活性炭的制备及其对硼的吸附特性
作者:
胡俊威;刘迎云;虢清伟;卓琼芳
期刊:
净水技术 ,2017年(5):53-58 ISSN:1009-0177
作者机构:
南华大学土木工程学院;[虢清伟; 卓琼芳] 环境保护部华南环境科学研究所;[刘迎云; 胡俊威] 南华大学
关键词:
葡甲胺;活性炭;改性;吸附;硼;解吸
摘要:
通过葡甲胺和活性炭制备了葡甲胺改性活性炭(NMDg-C),去除超标4倍的微量硼.试验考察了吸附时间、pH、温度和硼初始浓度对葡甲胺改性活性炭吸附硼效果的影响,并进行了吸附动力学和热力学分析.试验结果表明:改性后的活性炭吸附效果提高显著,吸附后的硼浓度降低到《生活饮用水卫生标准》(GB 5749-2006)以下;改性活性炭吸附硼的最佳条件:pH值为7,温度为15℃,30 mL的2.5mg/L的硼溶液,投加1.5 g改性活性炭,去除率达到90.59%,吸附平衡时间为30 min,理论饱和吸附量约为1.16 mg/g,其吸附过程较好地符合了准二级动力学模型(R2≈1)和Langmuir等温吸附模型,吸附快速.用1 mol/L的KCl溶液作解吸剂,NMDg-C可重复使用.
语种:
中文
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Effect of coexisting cations on the adsorption of cesium onto poly (beta-cyclodextrin)/bentonite composite
作者:
Liu, Hongjuan;Xie, Shuibo* ;Wang, Tiancheng;Liu, Yingjiu;Zeng, Taotao
期刊:
Journal of Radioanalytical and Nuclear Chemistry ,2017年312(3):557-565 ISSN:0236-5731
通讯作者:
Xie, Shuibo
作者机构:
[Liu, Hongjuan; Xie, Shuibo] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Peoples R China.;[Wang, Tiancheng; Liu, Hongjuan] Univ South China, Inst Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Xie, Shuibo; Liu, Yingjiu; Zeng, Taotao] Univ South China, Hunan Prov Key Lab Pollut Control & Resources Reu, Hengyang 421001, Peoples R China.
通讯机构:
[Xie, Shuibo] U;Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Peoples R China.;Univ South China, Hunan Prov Key Lab Pollut Control & Resources Reu, Hengyang 421001, Peoples R China.
关键词:
beta-CD/BNC;Bentonite;Cs+;Coexistent cation;Adsorption
摘要:
A novel poly(β-cyclodextrin)/bentonite composite (β-CD/BNC) was successfully prepared through graft polymerisation by using ammonium persulphate–sodium bisulphate as initiators, and characterized by FT-IR and EDS. The equilibrium data fit Freundlich isotherm satisfactorily. Adsorption kinetic was fitted with pseudo-second-order. The maximum adsorption capacities for Cs+ by β-CD/BNC in absence and presence of Na+ and Mg2+ were 48.83 ± 0.35, 47.30 ± 0.28, and 42.52 ± 0.85 mg g−1, respectively. Adsorption of Cs+ was suppressed by presence of Mg2+ more than Na+. β-CD/BNC had a higher affinity to Cs+ than Na+ and Mg2+. β-CD/BNC was an effective sorbent for the treatment cesium waste water. © 2017, Akadémiai Kiadó, Budapest, Hungary.
语种:
英文
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典型约束条件下锚杆受瞬态激振时的位移响应衰减规律研究
作者:
曾晟;周杰;孙冰
期刊:
黄金科学技术 ,2017年25(4):26-32 ISSN:1005-2518
作者机构:
南华大学核资源工程学院, 湖南, 衡阳, 421001;南华大学土木工程学院, 湖南, 衡阳, 421001;[曾晟; 周杰] 南华大学核资源工程学院, 湖南, 衡阳, 421001;[孙冰] 南华大学土木工程学院, 湖南, 衡阳, 421001
关键词:
锚杆;瞬态激振;低应变;约束条件;响应程度;动力特征
摘要:
为了研究锚杆在典型约束条件下受瞬态激振作用的响应特征,假定锚杆受激振动的范围均在弹性限度内且截面保持为平面、材料均匀各向同性,基于一维波动理论,根据达朗贝尔原理引入抗剪刚度和摩擦阻尼系数建立锚杆受激振动的波动方程。在求解过程中,引入狄拉克δ函数,运用特征值法得到两端自由和一端自由一端固定2种边界条件下锚杆的位移、速度和加速度场的解析解。分析锚杆受激振时的位移、加速度响应曲线,结果表明:因阻尼影响,一端固定一端自由的锚杆受瞬态激振时位移响应的衰减比两端自由的锚杆要快;另外,受锚杆侧向阻尼和抗剪刚度影响,一端固定一端自由的锚杆加速度响应振动幅值比两端自由状态下低大约4个数量级。
语种:
中文
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Stability Analysis of Slope Under Rainfall Infiltration and Optimal Design of Anti-slide Pile
作者:
Qian LIU;Jian-ming YANG;Shuai LIU
作者机构:
[Qian LIU; Jian-ming YANG; Shuai LIU] School of Civil Engineering, University of South China
会议名称:
2017 2nd International Conference on Environmental Science and Energy Engineering(ICESEE 2017)
会议时间:
2017-01-15
会议地点:
中国北京
关键词:
Slope stability;Persistence rainfall;Solid-fluid coupling;Anti-slide pile optimization
摘要:
Based on practical slope engineering, analysis model of seepage-stress coupling under continuous rainfall condition was established by Geo-Studio(geotechnical analysis software). The dynamic change pr
语种:
英文
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基于LES的单开口非稳态自然通风模拟
作者:
胡艳;周军莉
期刊:
建筑热能通风空调 ,2017年36(8):1-4,34 ISSN:1003-0344
作者机构:
南华大学土木工程学院;武汉理工大学土木工程与建筑学院;[胡艳] 南华大学;[周军莉] 武汉理工大学
关键词:
非稳态;单开口;自然通风;LES模拟
摘要:
本文对非稳态流场边界条件下的单开口建筑自然通风进行了大涡模拟,采用谐波叠加法生成随机脉动风速时程数据,同时考虑平均风速随高度呈指数分布,脉动风速经过零散度修正处理后作为数值模拟的入口边界条件。比较了不同开口面积,建筑体积以及平均风速对自然通风量的影响。研究结果表明:单开口建筑的自然通风量是风速和建筑开口面积的函数,还与体积相关。如果仍然采用常规稳态通风量模型会错误评估自然通风效果。
语种:
中文
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绿化布局对建筑周围风环境影响的数值研究
作者:
李四贵;顾炜莉;吴丹珍;刘亚君
期刊:
建筑热能通风空调 ,2017年36(11):19-22+40 ISSN:1003-0344
作者机构:
南华大学土木工程学院;[吴丹珍; 李四贵; 顾炜莉; 刘亚君] 南华大学
关键词:
绿化布局;CFD数值模拟;建筑周围风环境
摘要:
本文利用CFD数值模拟技术探讨绿化的存在对建筑物周围流场的影响,先对单棵树木的模型进行风环境数值模拟研究,分析不同孔隙率下1.5 m(人行高度)水平面速度云图、树后不同位置的风速分布,得到单棵树木周围的流场特征。接着,在相同的绿化量下,在建筑周围采用了三种不同的绿化布局形式,模拟计算其速度分布,比较分析三种绿化布局形式对建筑物周围风环境的影响。本文结论可为绿化设计提供参考依据。
语种:
中文
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MEC/AnMBR反应器组合处理生活污水
作者:
蔡文忠;张希晨;周耀辉
期刊:
南华大学学报(自然科学版) ,2017年31(2):107-112 ISSN:1673-0062
作者机构:
[蔡文忠] 衡阳市水务投资集团有限公司;南华大学土木工程学院;[张希晨; 周耀辉] 南华大学
关键词:
微生物电解;厌氧膜生物反应;生活污水;甲烷回收
摘要:
介绍了微生物电解池与厌氧膜生物(MEC-An MBR)反应器处理废水的作用机理.在尽量利用原有水处理设施前提下,以衡阳市某污水处理水厂的生活污水为处理对象,运用微生物电解池—厌氧膜生物(MEC-An MBR)反应器组合工艺对其进行中试试验,规模为1 m3/h.结果表明,该组合工艺能够明显提高生活污水的处理效率,减少膜污染,经处理后化学需氧量(COD)平均去除率可达88.8%,NH4+-N去除率为88.3%,TN去除率为72.1%,出水水质可达到《城镇污水污染物排放标准》一级标准,并能实现处理过程中稳定回收甲烷,减少能耗的目的.
语种:
中文
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尾矿酸化及其对尾矿砂抗剪强度的影响研究
作者:
熊冬霞;陈文昭;崔文平;朱四海;马煜琦
期刊:
南华大学学报(自然科学版) ,2017年31(1):11-16+27 ISSN:1673-0062
作者机构:
南华大学 土木工程学院,湖南 衡阳,421001;[马煜琦; 朱四海; 陈文昭; 熊冬霞; 崔文平] 南华大学
关键词:
黄铁矿氧化;酸化;抗剪强度;动态浸渍;稳定性
摘要:
为揭示尾矿酸化本质及其对尾矿砂抗剪强度的影响,开展了动态浸渍试验.从湖南省某铅锌矿采取了尾矿砂试样,采取加入双氧水的方式促使尾矿砂中的硫化物(主要为黄铁矿)发生氧化产酸.在浸泡试验的基础上开展了MLA(矿物解离分析仪)矿物成分分析、颗粒分析、抗剪强度等一系列实验.试验结果表明:尾矿矿物成分中随着黄铁矿氧化程度的增加,黄铁矿含量减少、碱性物质(方解石、白云母)减少、砂粒(粗粒)含量减少、粉粒(细粒)含量增加、粘聚力C增大、摩察角φ减小、尾矿砂土抗剪强度降低.
语种:
中文
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A study of diurnal and short-term variations of indoor radon concentrations at the University of Michigan, USA and their correlations with environmental factors
作者:
Xie, Dong;Liao, Maili;Wang, Hanqing* ;Kearfott, Kimberlee J.
期刊:
Indoor and Built Environment ,2017年26(8):1051-1061 ISSN:1420-326X
通讯作者:
Wang, Hanqing
作者机构:
[Xie, Dong; Wang, Hanqing; Liao, Maili] Univ South China, Dept Bldg Environm & Thermal Engn, Hengyang, Peoples R China.;[Xie, Dong; Kearfott, Kimberlee J.] Univ Michigan, Dept Nucl Engn & Radiol Sci, Ann Arbor, MI 48109 USA.;[Wang, Hanqing] Changsheng West Rd 28, Hengyang 421001, Hunan, Peoples R China.
通讯机构:
[Wang, Hanqing] C;Changsheng West Rd 28, Hengyang 421001, Hunan, Peoples R China.
关键词:
Indoor radon environment;Environmental parameters;Diurnal variation;Radon monitors;Correlation coefficient
摘要:
Measurements of indoor radon concentrations and environmental parameters were collected continuously on an hourly basis over a three-month period (April 2012 to June 2012). These were performed both in a well-ventilated ground floor laboratory and in the unventilated basement directly below it in a two-storey building at the University of Michigan, USA. The diurnal variations of indoor radon concentration were investigated along with their correlations to the environmental parameters. The results showed that in the laboratory with typical air exchange, the highest radon values appeared in the early morning while lower values emerged in the afternoon. A similar time-course was followed by radon concentrations in the basement with stagnant air. The day-average radon concentrations in the laboratory ranged from 27 ± 2 Bq m-'3 to 54 ± 5 Bq m-'3, with the overall mean of 37 ± 6 Bq m-'3 over the three-month data collection period. The overall basement average, 900 ± 92 Bq m-'3 is significantly higher than the population-weighted world average value of 39 Bq m-'3. For the ground-level laboratory, the indoor humidity, outdoor temperature and indoor-outdoor temperature difference were positively correlated with indoor radon. The indoor radon negatively correlated with outdoor barometric pressure, wind speed and indoor-outdoor barometric pressure differences. However, for the unventilated basement, the only statistically significant correlation of indoor radon concentration was a positive one with hourly rainfall. © International Society of the Built Environment.
语种:
英文
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Development of a model for single-sided, wind-driven natural ventilation in buildings
作者:
Zhou, Junli* ;Ye, Cheng;Hu, Yan;Hemida, Hassan;Zhang, Guoqiang;...
期刊:
Building Services Engineering Research and Technology ,2017年38(4):381-399 ISSN:0143-6244
通讯作者:
Zhou, Junli
作者机构:
[Zhou, Junli; Ye, Cheng; Yang, Wei] Wuhan Univ Technol, Sch Civil Engn & Architecture, Wuhan 430070, Peoples R China.;[Zhou, Junli; Hemida, Hassan] Univ Birmingham, Sch Engn, Birmingham, W Midlands, England.;[Hu, Yan] Univ South China, Coll Urban Construct, Hengyang, Peoples R China.;[Zhang, Guoqiang] Hunan Univ, Coll Civil Engn, Changsha, Hunan, Peoples R China.
通讯机构:
[Zhou, Junli] W;Wuhan Univ Technol, Sch Civil Engn & Architecture, Wuhan 430070, Peoples R China.
关键词:
Flow rate;single-sided ventilation;wind-driven;numerical simulation
摘要:
Natural ventilation is a simple and energy-efficient method to adjust the indoor environment. This study aims to develop a model for predicting the total flow rate of single-sided natural ventilation. It is motivated by the fact that the wind-driven ventilation itself is commonly considered to consist two components - a mean component and a fluctuating component. Pulsating flow rate, mean and broadband ventilation rate are discussed and considered in the model due to fluctuating wind velocity driven by the fluctuating pressures and unsteady flows around the opening. The new model shows that the total flow rate is majorly caused by pulsating flow when the area of opening is small, but it is mainly caused by mean flow in the case of large opening. Opening ratio can be taken as a boundary to distinguish the small opening area and the larger one from the case analyses in this study. Reynolds Averaged Navier-Stoke model, large eddy simulation, and other correlations are utilized to validate the developed model. The results of current method agree reasonably well with those of transient simulation. Finally, a simplified version of the model is developed which is useful for predicting the total flow rate of natural ventilation in buildings. Practical application: The model can be applied to predict the total flow rate of single-sided natural ventilation in buildings due to wind pressure. The model shows that the total flow rate is majorly caused by the pulsating flow when the area of opening is small, but it is mainly caused by the mean flow in the case of large opening. An opening ratio of 3% can be taken as a boundary to distinguish the small opening area and the large one from the cases analysed in this study. © 2017 SAGE Publications.
语种:
英文
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溶液除湿系统中再生子系统的运行参数分析
作者:
涂敏;刘泽华;汤广发;任承钦
期刊:
南华大学学报(自然科学版) ,2017年31(4):12-17,24 ISSN:1673-0062
作者机构:
南华大学 土木工程学院,湖南 衡阳,421001;湖南大学 土木工程学院,湖南 长沙,410082;湖南大学 机械与运载工程学院,湖南,长沙,410082;[任承钦; 汤广发] 湖南大学;[涂敏; 刘泽华] 南华大学
关键词:
溶液除湿;再生子系统;正交设计;方差分析;参数分析
摘要:
溶液除湿系统在生产和生活中已得到广泛应用,提高溶液除湿系统节能优势的关键措施之一是提高其再生子系统的效率.本文采用已得到实验验证的填料塔模型和逆流换热器模型,分别描述再生塔中溶液—空气传热传质过程和空气—空气换热器中逆流换热过程,然后用正交设计法安排数值实验.通过对实验结果的方差分析,确定了各运行参数及它们之间的交互作用的相对重要性.方差分析结果表明:以再生塔内水份蒸发速率作实验指标时,重要参数包括溶液入口温度和浓度、干空气与溶质之间的质量流量比率、再生空气入口温度;以再生塔再生效率作实验指标时,干空气与溶质之间的质量流量比率以及溶液入口温度是重要参数;参数之间的交互作用对再生塔内水份蒸发速率和再生效率都没有重要的影响.
语种:
中文
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土木工程学科专业型研究生实践创新能力的培养机制研究
作者:
彭成;田宗坤;郭庆梅;杨金辉
期刊:
教育现代化 ,2017年4(45):27-29 ISSN:2095-8420
作者机构:
南华大学 土木工程学院,湖南 衡阳,421001
关键词:
土木工程;专业型研究生;实践创新能力;培养机制
摘要:
本文对高校与行业企业联合培养人才的新机制、"五工程"培养体系及工程教育师资队伍素质提升等培养机制展开研究,从而探索适合我校土木工程学科专业型研究生实践创新能力的培养机制。对推进我国高等工程教育改革有着较为重要的意义。
语种:
中文
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土木工程特色下的建筑电气与智能化专业建设思路探讨
作者:
周立峰;蒋新波;罗清海
期刊:
教育现代化 ,2017年(04):59-61 ISSN:2095-8420
作者机构:
南华大学土木工程学院
关键词:
建筑电气与智能化;课程体系;教学团队;专业建设
摘要:
本文分析了建筑电气与智能化专业发展现状,针对专业建设和发展中存在的专业课程设置标准不一、师资力量匮乏等问题,提出了大土木背景下基于工程能力培养的专业课程体系设置和基于智能建筑的建筑电气与智能化教学团队建设思路,逐步建立独具特色的专业培养模式,培养社会所需人才。
语种:
中文
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Stress distribution of anchor bolts due to empty pulp defects
作者:
Zeng, Sheng* ;Zhang, Jing;Sun, Bing
作者机构:
[Zeng, Sheng; Zhang, Jing] Univ South China, Nucl Resources Engn Coll, Hengyang, Peoples R China.;[Sun, Bing] Univ South China, Inst Urban Construct, Hengyang, Peoples R China.
会议名称:
5th International Conference on Green Building, Materials and Civil Engineering (GBMCE)
会议时间:
APR 17-18, 2016
会议地点:
Hong Kong, PEOPLES R CHINA
会议主办单位:
[Zeng, Sheng;Zhang, Jing] Univ South China, Nucl Resources Engn Coll, Hengyang, Peoples R China.^[Sun, Bing] Univ South China, Inst Urban Construct, Hengyang, Peoples R China.
关键词:
Geotechnical engineering;defective bolt;non-destructive testing;single empty pulp
摘要:
In order to study the stress distribution and development of the empty pulp defects in anchor bolts, we carried out an experiment on an empty pulp defective bolt. The dynamic testing signals were obtained by non-destructive testing, and test signals under different loads were analyzed. Research shows that in the defective bolt, the strain and load show a linear trend before the empty pulp defect. In the empty pulp defective section, the strain will not have obvious change until the load reaches a certain value. After the empty pulp defect, stress redistribution occurs with the increase of load.
语种:
英文
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建筑暖通工程施工质量管理与控制
作者:
王海龙;戴石良
期刊:
智能城市 ,2017年(02):243+245 ISSN:2096-1936
作者机构:
1. 南华大学土木工程学院;2. 湖南高速铁路职业技术学院
关键词:
暖通工程;施工质量;管理和控制
摘要:
在科学技术快速发展的今天,人们对建筑本身功能性的要求越来越高,特别是在高楼林立的今天,人们对房屋的采暖和通风条件更加的重视。只有这些方面都做好了,才可以提高人们的生活质量、同时改善人们的工作环境。所以为了确保城市楼房的采暖和通风的顺畅,相关工作人员要加强对其施工质量进行管理和控制。
语种:
中文
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Experimental study on the variations in human skin temperature under simulated weightlessness
作者:
Zhu, Hui;Wang, Hanqing* ;Liu, Zhiqiang* ;Kou, Guangxiao;Li, Can;...
期刊:
Building and Environment ,2017年117:135-145 ISSN:0360-1323
通讯作者:
Liu, Zhiqiang;Wang, Hanqing
作者机构:
[Zhu, Hui; Wang, Hanqing; Liu, Zhiqiang] Cent S Univ, Sch Energy Sci & Engn, Changsha 410083, Hunan, Peoples R China.;[Zhu, Hui; Wang, Hanqing] Univ South China, Sch Civil Engn, Hengyang 421001, Peoples R China.;[Li, Duanru; Wang, Hanqing; Kou, Guangxiao; Li, Can] Collaborat Innovat Ctr Energy Conservat Bldg & En, Zhuzhou 412001, Peoples R China.
通讯机构:
[Liu, Zhiqiang] C;[Wang, Hanqing] U;Cent S Univ, Sch Energy Sci & Engn, Changsha 410083, Hunan, Peoples R China.;Univ South China, Sch Civil Engn, Hengyang 421001, Peoples R China.
关键词:
Air speed;Air temperature;HDBR;Relative humidity;Skin temperature;Weightlessness
摘要:
To study the variations in skin temperature in weightlessness, the skin temperatures of 6 male volunteers were measured under simulated weightlessness by head down bed rest (HDBR) experiments. The effects of the air temperature, relative humidity and air speed on the mean skin temperature were scrutinized, and the regional skin temperatures of the subjects under comfortable conditions were investigated. The results showed that the mean skin temperature increased with the air temperature both before and after HDBR in low and neutral air temperatures and that the mean skin temperature was found to be higher before HDBR. However, a higher mean skin temperature was observed after HDBR when the air temperature was high. Moreover, the mean skin temperature in low and neutral air temperatures was found to increase with the relative humidity both before and after HDBR, and a higher mean skin temperature was also observed before HDBR. Additionally, a negative correlation between the mean skin temperature and air speed was observed both before and after HDBR. However, different patterns of the mean skin temperature were observed when the environment changed from low air temperature and humidity to a neutral environment and finally to a high air temperature and humidity. Finally, the regional skin temperature after HDBR showed a different distribution compared with that before HDBR, such as a higher skin temperature in the thorax, forehead and back and a lower skin temperature in the thigh, calf and hand. This indicated that the skin temperature distribution changed greatly under simulated weightlessness by HDBR, which might suggest an altered thermal regulatory mechanism in humans experiencing weightlessness. © 2017 Elsevier Ltd
语种:
英文
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