Wind driven natural ventilation in the idealized building block arrays with multiple urban morphologies and unique package building density
作者：
Mei, Shuo-Jun;Hu, Jiang-Tao;Liu, Di;Zhao, Fu-Yun* ;Li, Yuguo;...
期刊：
Energy and Buildings ,2017年155:324-338 ISSN：0378-7788
通讯作者：
Zhao, Fu-Yun
作者机构：
[Hu, Jiang-Tao; Zhao, Fu-Yun; Mei, Shuo-Jun] Wuhan Univ, Key Lab Hydraul Machinery Transients, Minist Educ, Wuhan, Hubei, Peoples R China.;[Hu, Jiang-Tao; Zhao, Fu-Yun; Mei, Shuo-Jun] Wuhan Univ, Hubei Key Lab Waterjet Theory & New Technol, Wuhan, Hubei, Peoples R China.;[Hu, Jiang-Tao; Zhao, Fu-Yun; Mei, Shuo-Jun] Wuhan Univ, Sch Power & Mech Engn, Dong Hu South Rd, Wuhan 430072, Hubei, Peoples R China.;[Liu, Di] China Univ Petr, Coll Pipeline & Civil Engn, Qingdao, Shandong, Peoples R China.;[Li, Yuguo] Univ Hong Kong, Dept Mech Engn, Pokfulam Rd, Hong Kong, Hong Kong, Peoples R China.
通讯机构：
[Zhao, Fu-Yun] W;Wuhan Univ, Sch Power & Mech Engn, Dong Hu South Rd, Wuhan 430072, Hubei, Peoples R China.
关键词：
Airborne pollutant spread;Building frontal area density;Urban morphology;Wind-driven ventilation
摘要：
Improved ventilation in an urban residential neighborhood is a determinant for better energy efficiency and air quality of the neighborhood. This is particularly important for the real estimates recently developed in many cities in China, as these neighborhoods are built with high density. In this paper, we consider in an idealized neighborhood with two categories of packaging building densities (λp) of 0.25 and 0.44, which respectively represent medium and compact urban development. For each packaging density, the frontal area density of arrays is varied from 0.125 to 0.5 through adding building blocks and reducing building size simultaneously. Computational fluid dynamics simulations are carried out to predict the wind flow through the building arrays by the use of renormalization group (RNG) k-ε turbulence model. Our predictions are validated by comparing with experimental data. Numerical results reveal that ventilation rate could be greatly enhanced when a low level of packaging building density is maintained. The momentum exchange rate at the canopy roof level is effectively strengthened when the frontal area density decreases, together with a reduction of ventilation in the urban canopy layer (UCL). Additionally, a linear relationship is found between the UCL ventilation rate and the momentum exchange rate at the urban canopy roof level. For a constant packaging density, reducing frontal area density improves the city block ventilation by enhancing the air exchange rate at the roof level rather than increasing horizontal drag. This paper also illustrates a practical strategy in optimum neighborhood building layout design to minimize the pollutant level. © 2017 Elsevier B.V.
语种：
英文
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Normal dynamic deformation characteristics of non-consecutive jointed rock masses under impact loads
作者：
Zeng Sheng* ;Jiang Bowei;Sun Bing
期刊：
IOP Conference Series: Earth and Environmental Science ,2017年81(1) ISSN：1755-1307
通讯作者：
Zeng Sheng
作者机构：
[Jiang Bowei; Zeng Sheng] Univ South China, Nucl Resources Engn Coll, Hengyang 421001, Peoples R China.;[Sun Bing] Univ South China, Sch Civil Engn, Hengyang 421001, Peoples R China.
通讯机构：
[Zeng Sheng] U;Univ South China, Nucl Resources Engn Coll, Hengyang 421001, Peoples R China.
会议名称：
2nd International Conference on Materials Science, Energy Technology and Environmental Engineering (MSETEE)
会议时间：
APR 28-30, 2017
会议地点：
Zhuhai, PEOPLES R CHINA
会议主办单位：
[Zeng Sheng;Jiang Bowei] Univ South China, Nucl Resources Engn Coll, Hengyang 421001, Peoples R China.^[Sun Bing] Univ South China, Sch Civil Engn, Hengyang 421001, Peoples R China.
会议论文集名称：
IOP Conference Series-Earth and Environmental Science
摘要：
In order to study deformation characteristics of non-consecutive single jointed rock masses under impact loads, we used the cement mortar materials to make simulative jointed rock mass samples, and tested the samples under impact loads by the drop hammer. Through analyzing the time-history signal of the force and the displacement, first we find that the dynamic compression displacement of the jointed rock mass is significantly larger than that of the intact jointless rock mass, the compression displacement is positively correlated with the joint length and the impact height. Secondly, the vertical compressive displacement of the jointed rock mass is mainly due to the closure of opening joints under small impact loads. Finally, the peak intensity of the intact rock mass is larger than that of the non-consecutive jointed rock mass and negatively correlated with the joint length under the same impact energy. ©Published under licence by IOP Publishing Ltd.
语种：
英文
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Free convective energy management of an inclined enclosure mounted with triple heating elements: Multiple morphology optimizations with unique global energy supply
作者：
Zhang, Dong-Dong;Wang, Lei;Liu, Di;Zhao, Fu-Yun* ;Wang, Han-Qing
期刊：
International Journal of Heat and Mass Transfer ,2017年115(Pt.A):406-420 ISSN：0017-9310
通讯作者：
Zhao, Fu-Yun
作者机构：
[Zhao, Fu-Yun; Wang, Lei; Zhang, Dong-Dong] Wuhan Univ, Minist Educ, Key Lab Hydraul Machinery Transients, Wuhan, Hubei, Peoples R China.;[Zhao, Fu-Yun; Wang, Lei; Zhang, Dong-Dong] Wuhan Univ, Hubei Key Lab Waterjet Theory & New Technol, Wuhan, Hubei, Peoples R China.;[Zhao, Fu-Yun; Wang, Lei; Zhang, Dong-Dong] Wuhan Univ, Sch Power & Mech Engn, Dong Hu Southern Rd, Wuhan 430072, Hubei, Peoples R China.;[Liu, Di] China Univ Petr, Coll Pipeline & Civil Engn, Qingdao, Shandong, Peoples R China.;[Wang, Han-Qing] Univ South China, Sch Civil Engn, Hengyang, Hunan, Peoples R China.
通讯机构：
[Zhao, Fu-Yun] W;Wuhan Univ, Sch Power & Mech Engn, Dong Hu Southern Rd, Wuhan 430072, Hubei, Peoples R China.
关键词：
Thermal conductance;Direct enclosure convection;Inverse enclosure convection;Energy transport lines
摘要：
An objective-oriented optimization procedure consisting of a simplified conjugated gradient methodology and a two-dimensional fluid and thermal energy transfer model is implemented to discover optimal morphologies of local heating elements. Direct heat transfer problem and inverse optimization problem are subsequently investigated. Full simulation shows that thermal Rayleigh number, enclosure inclination, heating strength ratio and size ratio of local heating sources have significant effects on the natural convection heat transfer in the inclined enclosure, asymptotically modeling like solar energy collectors or electronic boxes. The fluid flow and energy transfer inside the enclosure are analyzed in some representative situations, by the simultaneous use of streamlines, isotherms and heatlines. Inverse natural convection solutions on the maximization of global conductance are addressed, concerning on the effects of thermal Rayleigh number, inclination angle, heater strength ratio and heater length ratio. Mathematical correlations have been proposed by the multiple linear regressions to identify the role of governing parameters on maximizing global conductance and optimal morphologies of the discrete heat sources, concerning on the unique global heating flux. Present numerical methodology and inverse procedures could benefit free cooling of electronic components and effective solar collection elements. (C) 2017 Elsevier Ltd. All rights reserved.
语种：
英文
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Factor analysis and optimization of operational parameters in a liquid desiccant air-conditioning system
作者：
Tu, Min;Huang, Hui;Liu, Ze-Hua;Chen, Huan-Xin* ;Ren, Cheng-Qin;...
期刊：
Energy ,2017年139:767-781 ISSN：0360-5442
通讯作者：
Chen, Huan-Xin
作者机构：
[Tu, Min; Chen, Huan-Xin] Huazhong Univ Sci & Technol, Sch Energy & Power Engn, Wuhan 430074, Hubei, Peoples R China.;[Liu, Ze-Hua; Chen, Guo-Jie; Tu, Min; Hu, Yan] Univ South China, Sch Civil Engn, Hengyang 421001, Peoples R China.;[Huang, Hui] Gree Elect Appliances Inc, Zhuhai 519070, Peoples R China.;[Ren, Cheng-Qin] Hunan Univ, Coll Mech & Vehicle Engn, Changsha 410082, Hunan, Peoples R China.
通讯机构：
[Chen, Huan-Xin] H;Huazhong Univ Sci & Technol, Sch Energy & Power Engn, Wuhan 430074, Hubei, Peoples R China.
关键词：
Air conditioning system;Factor analysis;Liquid desiccant;Orthogonal design;System performance optimization;Variance analysis
摘要：
Liquid desiccant dehumidification systems are widely used in many industries including HVAC. Special attention has been paid to the liquid desiccant air conditioning (LDAC) system performance analyses. However, the studies, such as factor analysis and performance optimization of LDAC system, have not received enough attention. This paper focuses on the factor analysis and optimization of the operational parameters of a LDAC system that has been described in previous work. Firstly, through the process of factor analysis, the most important factors and pair-wise interactions can be selected, when Excd is used as the target variable. Secondly, the optimum values for these factors that optimize Excd are found by using the method of orthogonal design. Thirdly, a sectioned polynomial regression model is developed to describe the relationship between the Excd and independent variables inclusive of the factors in the optimal combinations and the outdoor air parameters. With the variation of outdoor air parameters, the optimal values of tgen and ma7/md could also be predicated on the regression model. The accuracy of the regression model is also analyzed. Finally, according to the same analytical method, the operational parameters are analyzed and their levels are optimized when the COP is used as the target variable. © 2017
语种：
英文
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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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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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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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Synchronicity of stress wave propagation in bolt body and anchorage medium
作者：
Sun, Bing;Xie, Jie-Hui;Zeng, Sheng
期刊：
Journal of Engineering and Technological Sciences ,2017年49(2):247-260 ISSN：2337-5779
作者机构：
[Sun, Bing; Xie, Jie-Hui] School of Civil Engineering, University of South China, Hengyang, 421001, China;[Zeng, Sheng] School of Nuclear Resources Engineering, University of South China, NO28, West Changsheng Road, Hengyang, 421001, China
关键词：
Anchoring quality;Collaborative length;Geotechnical engineering;Non-destructive testing;Stress wave propagation velocity;Synchronization
摘要：
Accurate assessment of anchoring quality depends on the accuracy of assessing stress wave velocity in the anchor system. Stress wave velocity is closely related to collaborative vibration and depends on the degree of bonding between anchor body and anchorage medium. Bonding differences can be large at different ages. Based on stress wave reflection methods, non-destructive testing of anchors was performed using sensors arranged at the same cross-section of the anchor body and anchorage medium, which showed stress wave synchronization. In the early stage of filling, stress wave synchronicity was poorer between the anchor body and mortar. Therefore, the anchor should not be treated as a composite material when determining its wave velocity. Once the mortar hardens, the stress waves become more synchronous and the anchor can be regarded as a composite material. Stress wave synchronicity between the anchor body and mortar is related to mortar age and anchorage length. The anchor length required to provide stress wave synchronization between the anchor body and mortar decreases with increasing mortar age. Stress wave velocity rules were derived for different ages to provide the basis for accurately determining the stress wave velocity in the anchor. ©2017 Published by ITB Journal Publisher.
语种：
英文
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模拟失重条件下人体出汗变化规律的实验硏究
作者：
朱辉;王汉青;刘志强
期刊：
湖南大学学报(自然科学版) ,2017年44(9):188-196 ISSN：1674-2974
通讯作者：
Wang, Hanqing(hqwang2011@usc.edu.cn)
作者机构：
[朱辉; 刘志强; 王汉青] School of Energy Science and Engineering, Central South University, Changsha, 410083, China;[王汉青] School of Civil Engineering, University of South China, Hengyang, 421001, China
通讯机构：
School of Energy Science and Engineering, Central South University, Changsha, China
关键词：
模拟失重;皮肤微电流;出汗;空气温度;相对湿度
摘要：
针对失重条件下人体出汗所发生的变化,采用航天医学领域的-6°头低位卧床(HDBR)实验与常规热舒适实验相结合的方法,在12种空气温湿度下对6名男性受试者进行不同部位皮肤微电流的实验测量,将皮肤微电流作为人体出汗的指示信号.研究结果表明:HDBR模拟失重时,空气相对湿度较低的条件下(${\rm{RH = 30\% }}$)人体皮肤出汗比HDBR卧床前需要更高的空气温度刺激,并且出汗率相比卧床前出现一定程度的降低;中等湿度(45%)条件下,模拟失重时的皮肤出汗率随着空气温度增高而增加,但是显著低于HDBR卧床前的水平;高湿条件(80%)下且环境温度高于29时,模拟失重时人体皮肤出汗率显著增高,其值低于HDBR卧床前的水平但与其差值逐渐减小.此外,在实验环境下所有受试者的皮肤出汗敏感度降低,并且大腿、小腿、上臂皮肤出汗率显著低于额头、胸和背部皮肤处的出汗率.研究证明,模拟失重条件下人体皮肤出汗与正常重力时存在不同的变化,研究结果可为载人航天时人体热环境的改善提供依据.
语种：
中文
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建筑外墙最佳保温厚度及环境影响研究
作者：
刘向伟;郭兴国;陈国杰;陈友明;罗娜
期刊：
湖南大学学报(自然科学版) ,2017年44(9):182-187 ISSN：1674-2974
通讯作者：
Chen, Youming(ymchen@hnu.edu.cn)
作者机构：
[郭兴国; 刘向伟; 罗娜] School of Civil Engineering and Architecture, Nanchang University, Nanchang, 330031, China;[陈国杰] College of Civil Engineering, University of South China, Hengyang, 421001, China;[陈友明; 陈国杰] College of Civil Engineering, Hunan University, Changsha, 410082, China
通讯机构：
College of Civil Engineering, Hunan University, Changsha, China
关键词：
建筑外墙;保温层最佳厚度;生命周期成本;现值因子;环境影响
摘要：
建筑外墙保温能有效地减少建筑能耗,从而减少因能源消耗而引起的环境污染问题.本文用多层墙体非稳态传热模型进行能耗计算,并用${P_1} - {P_2}$经济性模型分析居住建筑外墙的生命周期成本,预测4个朝向2种常用保温材料的最佳保温层厚度和节能效益.同时,提出等价燃煤量方法,分别计算最佳保温层厚度和不保温情况下的$C{O_2}$和$S{O_2}$排放量,并分析应用最佳保温层厚度的减排潜力.以长沙地区为例,结果表明,保温层最佳厚度范围为0.08~0.13 m,生命周期最大净现值为116.26~133.45元/m~2,投资回收年限为3.1~3.5年.根据性价指标,膨胀聚笨乙烯比挤塑聚笨乙烯更具经济优越性.当采用最佳保温层厚度时,$C{O_2}$的排放量减少了17.4~19.51 kg/(m~2 a),$S{O_2}$的排放量减少了0.036~0.04 kg/(m~2 a),污染气体的排放量能减少了75.8%~78.6%.
语种：
中文
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紫花苜蓿绿色合成纳米铁及其对U(Ⅵ)去除性能的研究
作者：
刘清;李超;招国栋
期刊：
原子能科学技术 ,2017年51(7):1160-1166 ISSN：1000-6931
通讯作者：
Zhao, Guo-Dong(zgd777908@163.com)
作者机构：
[李超; 刘清] Hunan Key Laboratory of Pollution Control and Resource Reuse, University of South China, Hengyang, 421001, China;[招国栋] School of Environmental Protection and Safety Engineering, University of South China, Hengyang, 421001, China
通讯机构：
School of Environmental Protection and Safety Engineering, University of South China, Hengyang, China
关键词：
绿色合成;紫花苜蓿;去除
摘要：
植物还原制备绿色纳米金属材料因环境友好、反应条件温和、可持续发展、可控等优势成为纳米材料合成领域的研究热点。本文利用紫花苜蓿(Medicago sativa L.)还原制备绿色纳米铁颗粒(MLFeNPs),采用紫外可见分光光度计、X射线粉末衍射仪、扫描电子显微镜、透射电子显微镜、能谱仪、傅里叶变换红外光谱等方法对ML-FeNPs进行表征。结果表明:制备的ML-FeNPs为无定形的椭球形颗粒,粒径为70~80nm左右,纳米颗粒中的铁主要以Fe_2O_3、Fe_3O_4、FeOOH及Fe~0形式存在,颗粒表面包裹O—H、CH_2、C—H、C C、C—N、C—O—C等有机基团。ML-FeNPs对U(Ⅵ)去除性能的研究表明,在25℃、90min、pH=6、U(Ⅵ)初始浓度10.000 0mg/L、ML-FeNPs投加浓度12.520 0g/L条件下,U(Ⅵ)去除率达到88.90%。ML-FeNPs对U(Ⅵ)的去除主要发生在颗粒表面,去除机理为还原、吸附、络合共同作用,且其表面的有机基团能促进对U(Ⅵ)的去除。
语种：
中文
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Physicochemical Characteristics of Waste Activated Sludge after Gamma-Ray Irradiation
作者：
Wu, Yuqi;Jiang, Yinghe* ;Ke, Guojun
期刊：
Journal of Environmental Engineering ,2017年143(7):04017020-null ISSN：0733-9372
通讯作者：
Jiang, Yinghe
作者机构：
[Jiang, Yinghe; Wu, Yuqi] Wuhan Univ Technol, Sch Civil Engn & Architecture, Wuhan 430070, Peoples R China.;[Wu, Yuqi] Univ South China, Sch Urban Construct, Hengyang 421001, Peoples R China.;[Ke, Guojun] Univ South China, Sch Civil Engn, Hengyang 421001, Peoples R China.
通讯机构：
[Jiang, Yinghe] W;Wuhan Univ Technol, Sch Civil Engn & Architecture, Wuhan 430070, Peoples R China.
关键词：
Waste activated sludge;Gamma-ray irradiation;Physicochemical characteristics;Disintegration
摘要：
The physicochemical characteristics of waste activated sludge (WAS) exposed to Co60 gamma-ray irradiation at doses of 0 to 15 kGy were investigated. Results showed that irradiation dose significantly influenced the physicochemical properties of WAS. Static sedimentation experiment indicated that the settleability was slightly improved after irradiation. Measurement of suspended solids showed that the sludge volume decreased. A vacuum filtration test demonstrated that 1 to 4 kGy would be potentially successful for dewaterability enhancement, and irradiation and cationic polyacrylamide (CPAM) coconditioning showed desirable synergistic effects. Decreased particle size and increased turbidity of supernatant, soluble chemical oxygen demand (SCOD), and content of soluble extracellular polymeric substances (EPS) indicated that irradiation doses above 4 kGy could efficiently disintegrate sludge flocs and cells. An optimal value for the complete disintegration of sludge was not determined, because irradiation dose higher than 15 kGy was not applied in this study. Possible mechanisms of irradiation were also discussed. ©2017 American Society of Civil Engineers.
语种：
英文
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Comparative study of energy dissipation capacity of steel and glass fibre-reinforced polymer frames with bonded sleeve connections
作者：
Xiao, Xiao* ;Zhang, Zhujing;Bai, Yu
期刊：
Journal of Reinforced Plastics and Composites ,2017年36(22):1665-1679 ISSN：0731-6844
通讯作者：
Xiao, Xiao
作者机构：
[Xiao, Xiao] Univ South China, Sch Civil Engn, 28 West Changsheng Rd, Hengyang 421001, Hunan, Peoples R China.;[Zhang, Zhujing; Bai, Yu] Monash Univ, Dept Civil Engn, Clayton, Vic, Australia.
通讯机构：
[Xiao, Xiao] U;Univ South China, Sch Civil Engn, 28 West Changsheng Rd, Hengyang 421001, Hunan, Peoples R China.
关键词：
Cyclic behaviour;energy dissipation;pultruded GFRP frame;bonded sleeve connection;finite element analysis
摘要：
This paper presents a comparative study on the energy dissipation capacity of one glass fibre-reinforced polymer frame with bonded sleeve connection and steel frames with bolted endplate connections. Experimentally measured moment-rotation behaviour of a typical bonded sleeve connection was employed to develop the joint model for the glass fibre-reinforced polymer frame. In order to reduce the effect of the different beam size on the overall frame behaviour, the size of the steel profiles was selected to be equal, less than and greater than glass fibre-reinforced polymer profile in terms of the bending stiffness. The moment–rotation response of bolted endplate connection was then theoretically determined through Mohammadi’s design model. The frame models were developed using 3D beam elements and nonlinear spring elements. Comparing the energy dissipation capacity between glass fibre-reinforced polymer and steel frames at connections and floors, it was found that although glass fibre-reinforced polymer members were lack of ductility, the glass fibre-reinforced polymer frame can give satisfactory energy dissipation capacity that is comparable to steel frames. The energy dissipation capacity of glass fibre-reinforced polymer frame can be induced by the yielding of steel endplate from bonded sleeve connection.
语种：
英文
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Evaluation of Mould Growth on Wall Surface in South China
作者：
He, Yuyan;Chen, Guojie* ;Luo, Qinghai;Ge, Peihong
期刊：
Procedia Engineering ,2017年205:4135-4141 ISSN：1877-7058
通讯作者：
Chen, Guojie
作者机构：
[Luo, Qinghai; Ge, Peihong; Chen, Guojie; He, Yuyan] Univ South China, Sch Civil Engn, Hengyang 421001, Peoples R China.
通讯机构：
[Chen, Guojie] U;Univ South China, Sch Civil Engn, Hengyang 421001, Peoples R China.
会议名称：
10th International Symposium on Heating, Ventilation and Air Conditioning (ISHVAC)
会议时间：
OCT 19-22, 2017
会议地点：
Jinan, PEOPLES R CHINA
会议主办单位：
[He, Yuyan;Chen, Guojie;Luo, Qinghai;Ge, Peihong] Univ South China, Sch Civil Engn, Hengyang 421001, Peoples R China.
会议论文集名称：
Procedia Engineering
关键词：
Mould Growth;Coupled Heat and Moisture Transfer;Red Brick Wall;South China
摘要：
Mould contamination has negative consequences on the indoor air quality, and then on the health of the residents. It has an important significance for studying the mould contamination on building wall, especially in the south China. A dynamic mathematical model for simulating the coupled heat and moisture transfer within multilayer hygroscopic building wall was proposed. Temperature and humidity are critical for mould germinating. With the simulation results from the hydrothermal model, software WUFI-bio was used to evaluate the mould risk in the building. Once the humidity and temperature combination exceeds a limit, spore will germinate. Mould growth rate also was obtained, which was used for assessing risk level. The building with the red brick wall was studied as example, which is seated in Hengyang, Hunan province. Calculation period was a one year and time step was one hour. From the result, it can be found that there exists probability of mould growth in the red brick building in Hengyang, especially in winter and spring, and mould growth rate reaches the peak in February.<br/> ©2017 The Authors. Published by Elsevier Ltd.
语种：
英文
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Preliminary discussion on "internet +" sponge city modular construction system
作者：
Yang, Jinhui* ;Kang, Sijun;Luo, Weizu;Dai, Yanghong;Yang, Bing
期刊：
IOP Conference Series: Earth and Environmental Science ,2017年81(1) ISSN：1755-1307
通讯作者：
Yang, Jinhui
作者机构：
[Luo, Weizu; Yang, Bing; Yang, Jinhui; Kang, Sijun; Dai, Yanghong] Univ South China, Sch Civil Engn, Hengyang, Peoples R China.
通讯机构：
[Yang, Jinhui] U;Univ South China, Sch Civil Engn, Hengyang, Peoples R China.
会议名称：
2nd International Conference on Materials Science, Energy Technology and Environmental Engineering (MSETEE)
会议时间：
APR 28-30, 2017
会议地点：
Zhuhai, PEOPLES R CHINA
会议主办单位：
[Yang, Jinhui;Kang, Sijun;Luo, Weizu;Dai, Yanghong;Yang, Bing] Univ South China, Sch Civil Engn, Hengyang, Peoples R China.
会议论文集名称：
IOP Conference Series-Earth and Environmental Science
摘要：
To promote the construction of ecological civilization and the process of urbanization in China, in 2013, the government propose to build an innovative rainwater system, which is characterized by nature accumulation, natural penetration and natural purification - - low impact development of rainwater. This article Summarizes the research status of sponge city. It can be help the sponge city to become intelli-Gent and modular creatively by adding the intelligent concept of "internet+" and the modular concept into the sponge city. This article first introduces the "internet+" concept of sponge city, and then discussed the application of the "internet+" and modular concept in sponge city from the three stage of construction, management and performance evaluation, in order to provide some reference and revelation for the development of modular of "internet+" sponge city. ©Published under licence by IOP Publishing Ltd.
语种：
英文
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Numerical investigation of solid oxide electrolysis cells for hydrogen production applied with different continuity expressions
作者：
Zhang, Ji-Hao;Lei, Li-Bin;Liu, Di;Zhao, Fu-Yun* ;Chen, Fanglin;...
期刊：
Energy Conversion and Management ,2017年149:646-659 ISSN：0196-8904
通讯作者：
Zhao, Fu-Yun
作者机构：
[Zhang, Ji-Hao; Zhao, Fu-Yun] Wuhan Univ, Minist Educ, Key Lab Hydraul Machinery Transients, Wuhan, Hubei, Peoples R China.;[Zhang, Ji-Hao; Zhao, Fu-Yun] Wuhan Univ, Hubei Key Lab Waterjet Theory & New Technol, Wuhan, Hubei, Peoples R China.;[Zhang, Ji-Hao; Zhao, Fu-Yun] Wuhan Univ, Sch Power & Mech Engn, Wuhan 430072, Hubei, Peoples R China.;[Lei, Li-Bin; Chen, Fanglin] Univ South Carolina, Dept Mech Engn, Columbia, SC 29208 USA.;[Liu, Di] China Univ Petr, Coll Pipeline & Civil Engn, Qingdao, Shandong, Peoples R China.
通讯机构：
[Zhao, Fu-Yun] W;Wuhan Univ, Sch Power & Mech Engn, Wuhan 430072, Hubei, Peoples R China.
关键词：
Computational fluid dynamics (CFD);Current densities;SOECs modeling;Source imbalance
摘要：
A dynamic SOEC (Solid Oxide Electrolysis Cell) model is proposed to investigate the transient response and steady performance of a planar SOEC. Three representative types of continuity equation expressions are systematically compared for the simulation of source terms introduced by electrochemical reactions. For the conservative form of continuity equation (Type A), reasonable predictions at both sides of cathode and anode cannot be achieved, as the diffusion effect is neglected. The non-conservative form of continuity equation (Type B) can obtain reasonable prediction for the cathode side but poor prediction for the anode side. The Type C of continuity equation, newly proposed by the authors for modeling the SOECs, is based on the law of volume conservation. It could achieve the volume increment (oxygen produced) at the anode compartment and good agreements with the analytical ones. It is also found that continuity equations significantly influence the fluid flow and mass transport, whereas their effects on the electrical characteristics are negligible when the global current density is not high. © 2017 Elsevier Ltd
语种：
英文
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Modeling of the transient heat, air and moisture transfer in building walls
作者：
刘向伟;陈国杰;陈友明
期刊：
湖南大学学报(自然科学版) ,2016年43(1):152-156 ISSN：1674-2974
通讯作者：
Chen, You-Ming(ymchen@hnu.edu.cn)
作者机构：
[刘向伟; 陈国杰; 陈友明] College of Civil Engineering, Hunan Univ, Changsha, Hunan, China;[陈国杰] College of City Construction, Univ of South China, Hengyang, Hunan, China
通讯机构：
College of Civil Engineering, Hunan Univ, Changsha, Hunan, China
关键词：
建筑墙体;非稳态;热、空气、湿耦合传递;含湿量;相对湿度
摘要：
为了更准确地预测墙体内的温湿度分布,研究多孔介质墙体内的热、湿及空气耦合非稳态传递规律,以温度、相对湿度和空气压力为驱动势,考虑热传递、湿传递、空气渗透及其相互作用,建立了建筑多孔介质墙体热、湿及空气耦合传递非稳态模型,并采用有限元方法设计了相应的模拟计算程序.通过对比新建模型模拟结果与国际公认的HAMSTAD标准验证实例,验证了模型的正确性.
语种：
中文
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动静阻尼影响下锚杆瞬态动力响应的解析解及工作状态预测
作者：
孙冰;梁展平;曾晟;肖佳辉;付志国;...
期刊：
煤炭学报 ,2016年41(6):1400-1406 ISSN：0253-9993
通讯作者：
Zeng, Sheng(usczengs@126.com)
作者机构：
[黄振江; 肖佳辉; 付志国; 孙冰; 梁展平] School of Civil Engineering, University of South China, Hengyang, 421001, China;[Zeng, Sheng] Nuclear Resources Engineering College, University of South China, Hengyang, 421001, China
通讯机构：
Nuclear Resources Engineering College, University of South China, Hengyang, China
关键词：
锚杆;瞬态动力响应;动静阻尼;工作状态;振动基频
摘要：
为了分析动静阻尼条件下锚杆的瞬态动力响应特征以及荷载与锚杆振动基频之间的相互关系,在考虑锚固介质对锚杆产生的动态与静态阻尼力的影响下,基于波动理论建立了锚杆受瞬态激振时引起弹性振动的波动方程。在一端固定一端自由的边界条件下,求解锚杆位移场的解析解,得到基频与荷载之间呈二次幂函数关系。为了验证理论分析的结果,采用室内模型锚杆的拉拔试验和无损检测试验,对不同加载等级下的动测信号进行频谱分析得出对应的基频,采用最小二乘法拟合得到荷载与基频之间的函数关系也呈二次幂函数关系,且施加的荷载小于锚杆体与锚固介质间的握固力时,荷载与基频呈正相关关系,荷载大于握固力时,二者呈负相关关系,这与理论分析结果基本吻合。
语种：
中文
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耐铀颗粒污泥微生物群落结构解析
作者：
曾涛涛;鲁慧珍;刘迎九;刘金香;荣丽杉;...
期刊：
中国有色金属学报 ,2016年26(1):233-241 ISSN：1004-0609
通讯作者：
Xie, Shui-Bo(xiesbmr@263.net)
作者机构：
[Zeng, Tao-Tao] Postdoctoral Research Centre of Mining Engineering, University of South China, Hengyang, China;[谢水波] Key Discipline Laboratory for National Defence for Biotechnology in Uranium Mining and Hydrometallurgy, University of south China, Hengyang, China;[马华龙; 刘迎九; 谢水波; 鲁慧珍; Zeng, Tao-Tao; 荣丽杉; 刘金香] Hunan Province Key Laboratory of Pollution Control and Resources Reuse Technology, University of South China, Hengyang, China
通讯机构：
Hunan Province Key Laboratory of Pollution Control and Resources Reuse Technology, University of South China, Hengyang, China
关键词：
耐铀性能;颗粒污泥;微生物群落;高通量测序
摘要：
以厌氧颗粒污泥为对象,测试其对不同浓度U(Ⅵ)(2.4~12 mg/L)的去除效果,通过环境扫描电子显微镜(ESEM)和高通量测序技术等方法解析铀胁迫下微生物群落结构特性。结果表明:在初始U(Ⅵ)浓度为9.6mg/L、pH为6、投加湿污泥2g(污泥的可挥发性悬浮在体浓度为0.1g)条件下,U(Ⅵ)的去除率最高,达到95.1%;颗粒污泥中微生物以直径约1 μm的球形细菌为主,能谱分析(EDS)也证明细胞表面铀的存在。高通量测序得到15939条有效序列,可划分操作分类单元939个。样品文库覆盖率为0.967,Shannon指数、ACE指数和Chao1指数分别为4.099、3140.55与2122.53,表明样品具有较高的微生物多样性与丰富度。菌属分类显示:颗粒污泥中包含许多典型的铀还原固定菌属,如Acinetobacter、Clostridium、Pseudomonas、Sulfurovum、Sulfurospirillum及Trichococcus,这是颗粒污泥具有高效除铀效果与耐铀性能的原因。
语种：
中文
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木屑季铵盐型螯合吸附剂对U(Ⅵ)的吸附性能研究
作者：
周书葵;刘迎九;邓文静;曾光明;江海浩;...
期刊：
原子能科学技术 ,2016年50(1):24-30 ISSN：1000-6931
通讯作者：
Zeng, Guang-Ming(zgming@hnu.cn)
作者机构：
[Zeng, Guang-Ming; 周书葵] School of Environment Science and Engineering, Hunan University, Changsha, China;[江海浩; 刘迎九; 邓文静; 康丽; 方良; 周书葵] School of Urban Construction, University of South China, Hengyang, China
通讯机构：
School of Environment Science and Engineering, Hunan University, Changsha, China
关键词：
季铵盐;木屑;吸附
摘要：
通过对木屑进行化学改性,制备了木屑季铵盐型螯合吸附剂(MS),用于强化木屑对含铀废水中U(Ⅵ)的吸附性能。对所得MS的晶体结构和表面形貌进行了分析,探索了MS投加量、反应时间、溶液pH值和反应温度对吸附性能的影响,并在此基础上分析吸附机理。结果表明:MS投加量为0.1g/L、吸附时间为2h、pH=4.5、吸附温度为30℃时,铀去除率达99.7%,较未改性木屑对铀的吸附率提高了26.9%。以0.1mol/L的HCl溶液作为脱附剂,初次解吸率达99.9%,表明MS具有较好的重复利用性。
语种：
中文
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