氧化石墨烯复合材料吸附铀的研究进展
作者：
刘红娟;谢水波;张希晨;刘迎九;曾涛涛
期刊：
材料工程 ,2018年46(5):11-21 ISSN：1001-4381
通讯作者：
Xie, Shui-Bo(xiesbmr@263.net)
作者机构：
[刘红娟; 谢水波] Institute of Nuclear Science and Technology, University of South China, Hengyang;Hunan;421001, China;Key Discipline Laboratory for National Defence for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang;[张希晨; 刘迎九; Zeng, Tao-Tao] Hunan Province Key Laboratory of Pollution Control and Resources Reuse Technology, University of South China, Hengyang
通讯机构：
[Xie, S.-B.] I;Institute of Nuclear Science and Technology, University of South China, Hengyang, Hunan, China
关键词：
石墨烯;复合材料;铀;吸附;微观结构
摘要：
氧化石墨烯由于具有超大的比表面积、高强度和化学稳定性好等优点,其在环保领域作为含铀废水吸附材料的应用潜能备受关注。本文综述了近年来石墨烯基复合材料吸附水溶液中铀的研究现状及进展,介绍了石墨烯基复合材料对铀的吸附性能,分析了溶液pH值、温度、离子强度、接触时间和吸附剂用量等因素对吸附效果影响的原理,阐述了通过表面络合模型,光谱分析和理论计算等方法探讨氧化石墨烯复合材料的微观形貌结构与铀吸附效果之间的内在联系,最后研究了氧化石墨烯复合材料吸附铀研究中面临的挑战,对石墨烯材料与轴的相互作用机理及其在环保方面的开发应用进行了展望。
语种：
中文
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Two-dimensional numerical simulation of wind driven ventilation across a building enclosure with two free apertures on the rear side: Vortex shedding and “pumping flow mechanism”
作者：
Zhong, Huai-Yu;Zhang, Dong-Dong;Liu, Di;Zhao, Fu-Yun* ;Li, Yuguo;...
期刊：
Journal of Wind Engineering and Industrial Aerodynamics ,2018年179:449-462 ISSN：0167-6105
通讯作者：
Zhao, Fu-Yun
作者机构：
[Zhong, Huai-Yu; Zhao, Fu-Yun; Zhang, Dong-Dong] Wuhan Univ, Minist Educ, Key Lab Hydraul Machinery Transients, Wuhan, Hubei, Peoples R China.;[Zhong, Huai-Yu; Zhao, Fu-Yun; Zhang, Dong-Dong] Wuhan Univ, Hubei Key Lab Waterjet Theory & New Technol, Wuhan, Hubei, Peoples R China.;[Zhong, Huai-Yu; Zhao, Fu-Yun; 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.;[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 Southern Rd, Wuhan 430072, Hubei, Peoples R China.
关键词：
Computer simulation;Enclosures;Flow velocity;Navier Stokes equations;Numerical models;Pumps;Reynolds number;Ventilation;Vortex flow;Vortex shedding;Walls (structural partitions);Wind;Building enclosure;Natural ventilation;Numerical investigations;Pressure correction;Pumping mechanism;Reynolds-averaged-navier-stokes approaches;Two-dimensional numerical simulation;Ventilation performance;Computational fluid dynamics
摘要：
This paper investigates the single-sided wind driven natural ventilation with two apertures on the rear wall, regarding different horizontal aperture separations, magnitudes of incoming wind speed and various side ratios (L/D, length/width). In the present work, CFD simulations are performed with Reynolds-Averaged Navier-Stokes (RANS) approach, and pressure correction linked equation is adopted to provide closure. The simulation results indicate that wind flow behind the rear wall is essentially driven by the pumping mechanism due to vortex shedding, in which wind flow direction alternates at a mean rate. The frequency of the “pumping” flow increases dramatically with the wind flow velocity at a wide range of Reynolds numbers. The decrease of free aperture separation reduces the enclosure flow rate whilst the frequency of the wind flow almost maintains at a constant value. The increase of sidewall length has similar impacts on the ventilation frequency and the dimensionless ventilation flow rate. Numerical investigations further demonstrate that non-dimensional ventilation rate can be promoted by increasing incoming wind velocities when the wind speed is less than 5 m/s. This promotion will be restrained when the wind speed is further increased. The simulation results of built enclosure flow rate, frequency of enclosure flow can be applied to improve the ventilation performance of buildings merely with rear wall openings. © 2018 Elsevier Ltd
语种：
英文
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Adsorption of U(VI) from Aqueous Solution by a Novel Chelating Adsorbent Functionalized with Amine Groups: Equilibrium, Kinetic, and Thermodynamic Studies
作者：
Zhou, Shu-Kui* ;Liu, Ying-Jiu;Jiang, Hai-Yang;Deng, Wen-Jing;Zeng, Guang-Ming
期刊：
ENVIRONMENTAL ENGINEERING SCIENCE ,2018年35(1):53-61 ISSN：1092-8758
通讯作者：
Zhou, Shu-Kui
作者机构：
[Zhou, Shu-Kui; Liu, Ying-Jiu; Deng, Wen-Jing] Univ South China, Sch Civil Engn, Dept Water Sci & Engn, Hengyang 421001, Peoples R China.;[Zhou, Shu-Kui; Zeng, Guang-Ming] Hunan Univ, Sch Environm Sci & Engn, Dept Environm Sci, Changsha, Hunan, Peoples R China.;[Jiang, Hai-Yang] Hunan City Univ, Dept Water Sci & Engn, Coll Municipal & Mapping Engn, Yiyang, Peoples R China.
通讯机构：
[Zhou, Shu-Kui] U;Univ South China, Sch Civil Engn, Dept Water Sci & Engn, Hengyang 421001, Peoples R China.
关键词：
adsorption;amine;kinetics;sawdust;thermodynamics;U(VI)
摘要：
A novel chelating adsorbent, modified sawdust (MS), was synthesized by grafting quaternary ammonium on the cellulose of sawdust, was first designed for high performance U(VI) removal. The property MS was characterized by scanning electron microscopy, energy dispersive X-ray, X-ray diffractometer, and Fourier transform infrared spectroscopy. Removal efficiency of U(VI) for MS and raw sawdust (RS) was evaluated at different dosages, pHs, contact times, and temperatures. Results showed that maximum U(VI) removal efficiencies of 99.7% and 72.8% for MS and RS, respectively, were observed at adsorbent dose of 0.1 g, contact time of 2 h, pH 4.5, and temperature 30°C. Adsorption equilibrium of U(VI) onto MS was well described by the Langmuir isotherm model. Also, the thermodynamic result showed that the adsorption process was feasible, spontaneous, and endothermic in nature. Adsorption kinetic data were fitted well with a pseudo-second order model. High U(VI) removal performance for MS was attributed to the adsorption of U(VI) on amine groups, followed by U(VI) chelation. Results indicate MS has great potential in treating uranium-contaminated water. © Copyright 2018, Mary Ann Liebert, Inc. 2018.
语种：
英文
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Multi-objective-oriented removal of airborne pollutants from a slot-ventilated enclosure subjected to mechanical and multi component buoyancy flows
作者：
Zhang, Dong-Dong;Zhong, Huai-Yu;Liu, Di;Zhao, Fu-Yun* ;Li, Yuguo;...
期刊：
Applied Mathematical Modelling ,2018年60:333-353 ISSN：0307-904X
通讯作者：
Zhao, Fu-Yun
作者机构：
[Zhong, Huai-Yu; Zhao, Fu-Yun; Zhang, Dong-Dong] Wuhan Univ, Key Lab Hydraul Machinery Transients, Minist Educ, Wuhan, Hubei, Peoples R China.;[Zhong, Huai-Yu; Zhao, Fu-Yun; Zhang, Dong-Dong] Wuhan Univ, Hubei Key Lab Waterjet Theory & New Technol, Wuhan, Hubei, Peoples R China.;[Zhong, Huai-Yu; Zhao, Fu-Yun; Zhang, Dong-Dong] Wuhan Univ, Sch Power & Mech Engn, Wuhan, 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, Pok Fu Lam Rd, Hong Kong, Hong Kong, Peoples R China.
通讯机构：
[Zhao, Fu-Yun] W;Wuhan Univ, Sch Power & Mech Engn, Wuhan, Hubei, Peoples R China.
关键词：
Slot-ventilated enclosure flows;Discrete contaminant source;Species transport function;Spatial average concentration;Mean radius of diffusion
摘要：
Slot-ventilated enclosure flows, jointly driven by two component buoyancy forces and forced ventilation, extensively exist in the industrial and civil environment. Inverse fluid flow solutions of the multi-objective oriented removal of airborne pollutants from the slot ventilated enclosure, simultaneously subjected to mechanical forces and multi-component buoyancy forces, are conducted in the present work. A simplified conjugate gradient methodology has been implemented to provide effective convection removal of contaminants, under different flow regimes. In particular, direct and inverse convection problems are subsequently solved in detail. For the direct convection problem, aiding and opposing multi-component buoyancy effects are included to study the convective heat and species transport mechanism. For the inverse optimization problem, a single-objective optimization is firstly implemented, which also provides input parameters for the multi-objective optimization. Following that, a multi-objective function is set up by combining the two single objectives involving the spatial average concentration and the mean radius of diffusion. Multi-objective optimization is then implemented depending on the conjugate gradient procedures. Both the single and multi-objectives could be achieved reasonably through positioning of local heating sources and the free vent outlet. Our solution methodology will be useful for improving room pollutant removal and developing efficient ventilation strategies. © 2018 Elsevier Inc.
语种：
英文
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Dynamic responses of bridge–embankment transitions in high speed railway: Field tests and data analyses
作者：
Hu, Ping;Zhang, Chunshun;Chen, Shu Jian;Wang, Yonghe;Wang, Wei;...
期刊：
Engineering Structures ,2018年175:565-576 ISSN：0141-0296
通讯作者：
Duan, Wen Hui
作者机构：
[Hu, Ping] South China Univ, Sch Civil Engn, Hengyang 421001, Peoples R China.;[Wang, Wei; Zhang, Chunshun; Hu, Ping; Duan, Wen Hui; Chen, Shu Jian] Monash Univ, Dept Civil Engn, Melbourne, Vic 3800, Australia.;[Wang, Yonghe] Cent S Univ, Sch Civil Engn, Changsha 410075, Hunan, Peoples R China.
通讯机构：
[Duan, Wen Hui] M;Monash Univ, Dept Civil Engn, Melbourne, Vic 3800, Australia.
关键词：
Ballastless track;Bridge–embankment transition;Data analysis;Dynamic response;High speed railway;Wavelet soft threshold
摘要：
By virtue of its high speed, steadiness, and quality experience, high speed railway (HSR) has grown rapidly. During that development, problems such as dynamic irregularity in the bridge–embankment transition have been exposed and have aroused keen attention. To study dynamic performance in bridge–embankment transition, field dynamic tests under 120 high speed vehicles running at speeds of 5–360 km/h were carried out. Then, processed signals were obtained from the original signals by a series of signal processing methods such as wavelet soft threshold filtering, Newton-Cortege integration, and five-thirds smoothing. Moreover, the statistical test data were analyzed in the time/frequency domain to obtain the frequency characteristics, the rules governing changes in dynamic responses along the longitudinal and depth directions, and the rules governing changes in dynamic responses with train speed, train running direction, vehicle axle load, and adjacent load. The results showed that (i) the concentration range of the first two main frequency was generally 0–50 Hz, (ii) particular attention should be paid to sections 7.5 m, 13 m and 25 m from the abutment tail, and (iii) importance should be attached to the bed surface layer. As well, 275 km/h was the critical train speed and acceleration was a sensitive dynamic index. Finally, the dynamic responses showed that a bridge–embankment transition with the subgrade filled with graded gravel + 5% cement satisfied design and operation requirements at speeds of 5–360 km/h. © 2018
语种：
英文
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Simultaneous determination of the radon diffusion coefficient and the free radon production rate from compact porous emanation media
作者：
Ye, Yong-jun* ;Wu, Wen-hao;Feng, Sheng-yang;Huang, Chun-huang;Li, Shi
期刊：
Building and Environment ,2018年144:66-71 ISSN：0360-1323
通讯作者：
Ye, Yong-jun
作者机构：
[Li, Shi; Ye, Yong-jun; Wu, Wen-hao; Feng, Sheng-yang] Univ South China, Sch Environm & Safety Engn, Hengyang 421001, Hunan, Peoples R China.;[Huang, Chun-huang] Univ South China, Sch Civil Engn, Hengyang 421001, Hunan, Peoples R China.;[Ye, Yong-jun] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[Ye, Yong-jun] U;Univ South China, Sch Environm & Safety Engn, Hengyang 421001, Hunan, Peoples R China.
关键词：
Compact porous emanation media;Diffusion coefficient;Production rate;Radon
摘要：
The radon diffusion coefficient and the free radon production rate are important parameters for used to describe the migration of radon in porous emanation media. However, the method currently used to determine these two parameters is complicated. Based on a theory of the radon exhalation by diffusion from the inner and outer surfaces of a circular tube, a method to determine these two parameters in compact porous emanation media was proposed, and an experimental measuring device was designed and manufactured. The experimental device was used to simultaneously measure the radon exhalation rate from the inner and outer surfaces of a quarter-circular tubular concrete block filled with fine-grained uranium tailing sand. The measurements were used to calculate the radon diffusion coefficient and the free radon production rate. The result obtained by using this method shows that accuracy was within the accepted range of experimental error. This method has practical value for the simultaneous determination of the radon diffusion coefficient and the free radon production rate from compact porous emanation media.
语种：
英文
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Buoyancy driven double diffusive moisture convection inside the fluid-porous-solid sandwiched building enclosure containing internal heating sources
作者：
Hu, Jiang-Tao;Mei, Shuo-Jun;Liu, Di;Zhao, Fu-Yun* ;Wang, Han-Qing
期刊：
International Journal of Heat and Mass Transfer ,2018年123:600-615 ISSN：0017-9310
通讯作者：
Zhao, Fu-Yun
作者机构：
[Hu, Jiang-Tao; Zhao, Fu-Yun; Mei, Shuo-Jun] Wuhan Univ, Minist Educ, Key Lab Hydraul Machinery Transients, 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 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：
Air;Aspect ratio;Buoyancy;Enclosures;Heat generation;Heat storage;Heat transfer;Intelligent buildings;Moisture;Moisture control;Rats;Thermal conductivity;Walls (structural partitions);Composite wall;Constant temperature;Double-diffusive convection;Heat and moisture transfer;Increasing functions;Internal heat generation;Sustainable building;Thermal conductivity ratio;Heat convection
摘要：
Double diffusive convection in an enclosure partially inserted with heat-generated porous layer and solid layer is investigated numerically. Moist air motions are simultaneously driven by the internal heat generation and external concentration difference imposed across the enclosure. Identical porous and solid layers are attached to the vertical walls, and the walls are held at constant temperatures and concentrations. The horizontal walls of the enclosure are assumed to be adiabatic and impermeable. The aspect ratio of the cavity is equal to 1.0 and the saturating fluid is moist air (Pr = 0.7 and Le = 0.8). Present research covers the range of Rat from 103 to 107, N from −10.0 to 10.0, Da from 10−9 to 10−1, Φ from −90° to 90°, and Krf and Krs from 0.1 to 10.0. The results show that the thermal and solutal buoyancy forces are always aiding with each other and the minus sign of N only has influence on the fluid orientations. For the vertical case, heat and moisture transfer of fluid/porous interface is analyzed as a function of the buoyancy ratio. Average Nusselt and Sherwood numbers are increasing functions of Rat, N, Krp and Krs. Furthermore, volume averaged heat transfer rate as functions of inclination angle, for N > 0.0, is presented like a sinusoid, where the maximum is near at Ф = 45° and 135°, whereas the minimum is located at Ф = 90°. Present research could benefit future development of sustainable building energy storage. © 2018 Elsevier Ltd
语种：
英文
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Thermoelectric heat recovery units applied in the energy harvest built ventilation: Parametric investigation and performance optimization
作者：
Cai, Yang;Mei, Shuo-Jun;Liu, Di;Zhao, Fu-Yun* ;Wang, Han-Qing
期刊：
Energy Conversion and Management ,2018年171:1163-1176 ISSN：0196-8904
通讯作者：
Zhao, Fu-Yun
作者机构：
[Zhao, Fu-Yun; Mei, Shuo-Jun; Cai, Yang] Wuhan Univ, Key Lab Hydraul Machinery Transients, Minist Educ, Wuhan, Hubei, Peoples R China.;[Zhao, Fu-Yun; Mei, Shuo-Jun; Cai, Yang] Wuhan Univ, Hubei Key Lab Waterjet Theory & New Technol, Wuhan, Hubei, Peoples R China.;[Zhao, Fu-Yun; Mei, Shuo-Jun; Cai, Yang] Wuhan Univ, Sch Power & Mech Engn, 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, Wuhan 430072, Hubei, Peoples R China.
关键词：
Cost-performance model;Energy recovery and harvest ventilation;Parametric optimization;Thermoelectric heat recovery unit
摘要：
A thermoelectric heat recovery unit could actively use thermoelectric refrigeration process to recover waste heat of the air exhausted from buildings. Theoretical analysis of a thermoelectric heat recovery unit is firstly conducted in the present work, and a corresponding mathematical model is proposed to incorporate with the thermoelectric cooling effect and the method of effectiveness-number of transfer units. Subsequently, the cost-performance model considering the relationship between system performances and operating cost is set up, aiming to critically evaluate the global performance of thermoelectric heat recovery system. Overall thermal conductance is determined analytically from steady-state model, where the optimal operating parameters, including the quantity, filling factor, length of P-N legs and couple numbers of thermoelectric coolers are identified. Finally, this prediction method is used to analyze system performance and operating cost in a practical thermoelectric heat recovery system operated in a representative residential building area. The simulation results demonstrated that the lower operating cost of a thermoelectric heat recovery system could be lower than 0.02 $/kWh under the optimal parametric conditions. In addition, present demo investigations indicated that the use of multiple thermoelectric cooling units in the heat recovery ventilation system could further reduce operating cost and promote the cooling capacity simultaneously. Present work illuminated that the thermoelectric heat recovery unit has a great potential for being applied in future energy-efficient buildings. © 2018 Elsevier Ltd
语种：
英文
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不同固定剂对铀尾矿库中铀稳定效果的试验研究
作者：
周书葵;侯康龙;刘迎九;王浩铭;李智东;...
期刊：
原子能科学技术 ,2018年52(4):583-589 ISSN：1000-6931
作者机构：
[周书葵; 侯康龙; 刘迎九; 王浩铭; 李智东; 张建] School of Civil Engineering, University of South China, Hengyang;421001, China;[周书葵; 侯康龙; 刘迎九; 王浩铭; 李智东; 张建] 421001, China
关键词：
固定剂;铀尾矿库;铀;固定;形态分布
摘要：
利用壳聚糖、凹凸棒土、还原铁粉和羟基磷灰石4种固定剂对铀尾矿库中的铀进行固定化处理,通过逐级化学提取法和毒性浸出试验(TCLP)研究了铀尾矿库中铀的形态分布特征与浸出特性.结果表明:固定剂对铀的形态分布的影响存在显著差异,壳聚糖、凹凸棒土和还原铁粉掺杂后主要促进可交换态(包括水溶态)铀向其他较稳定结合态铀转化,羟基磷灰石掺杂显著提高了残渣态铀的含量.固定能力强弱依次为:羟基磷灰石>还原铁粉>凹凸棒土>壳聚糖.TCLP结果表明:壳聚糖增强了铀的活性,浸出量增加4%~23%;羟基磷灰石降低铀的浸出量近80%,是铀尾矿库中铀稳定效果较好的一种固定剂.
语种：
中文
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过渡金属掺杂构建超细二氧化钛的表面缺陷以提升光催化产氢活性
作者：
Liu, Qi-Feng;Zhang, Qian;Liu, Bing-Rui;Li, Shiyou* ;Ma, Jing-Jun*
期刊：
催化学报 ,2018年39(3):542-548 ISSN：0253-9837
通讯作者：
Ma, Jing-Jun;Li, Shiyou
作者机构：
[Liu, Bing-Rui; Liu, Qi-Feng; Zhang, Qian; Ma, Jing-Jun] Agr Univ Hebei, Coll Sci & Technol, Huanghua 061100, Hebei, Peoples R China.;[Li, Shiyou] Univ South China, Hunan Prov Key Lab Pollut Control & Resources Tec, Hengyang 421001, Hunan, Peoples R China.;[Ma, Jing-Jun] Hebei Agr Prod Proc Engn Technol Res Ctr, Baoding 071001, Hebei, Peoples R China.
通讯机构：
[Ma, Jing-Jun] A;[Li, Shiyou] U;[Ma, Jing-Jun] H;Agr Univ Hebei, Coll Sci & Technol, Huanghua 061100, Hebei, Peoples R China.;Univ South China, Hunan Prov Key Lab Pollut Control & Resources Tec, Hengyang 421001, Hunan, Peoples R China.
关键词：
Construction of surface defects;Low-cost transition metal;Photocatalytic H2 production;Surface doping;Ultrafine TiO2
摘要：
Inefficient charge separation and limited light absorption are two critical issues associated with high-efficiency photocatalytic H<inf>2</inf>production using TiO<inf>2</inf>. Surface defects within a certain concentration range in photocatalyst materials are beneficial for photocatalytic activity. In this study, surface defects (oxygen vacancies and metal cation replacement defects) were induced with a facile and effective approach by surface doping with low-cost transition metals (Co, Ni, Cu, and Mn) on ultrafine TiO<inf>2</inf>. The obtained surface-defective TiO<inf>2</inf>exhibited a 3–4-fold improved activity compared to that of the original ultrafine TiO<inf>2.</inf>In addition, a H<inf>2</inf>production rate of 3.4 μmol/h was obtained using visible light (λ>420 nm) irradiation. The apparent quantum yield (AQY) at 365 nm reached 36.9% over TiO<inf>2</inf>-Cu, significantly more than the commercial P25 TiO<inf>2</inf>. The enhancement of photocatalytic H<inf>2</inf>production activity can be attributed to improved rapid charge separation efficiency and expanded light absorption window. This hydrothermal treatment with transition metal was proven to be a very facile and effective method for obtaining surface defects.<br/> ©2018 Dalian Institute of Chemical Physics, the Chinese Academy of Sciences
语种：
英文
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Thermal and Moisture Transport Inhibitions in a Moist Air Saturated Enclosure Attached with Protruding Partitions for Built Energy Conservations
作者：
Zhao, Fu-Yun* ;Li, Lin;Liu, Di;Hu, Jiang-Tao;Wang, Han-Qing
期刊：
Heat Transfer Engineering ,2018年39(20):1731-1752 ISSN：0145-7632
通讯作者：
Zhao, Fu-Yun
作者机构：
[Wang, Han-Qing; Li, Lin; Zhao, Fu-Yun] Hunan Univ Technol, Sch Civil Engn, Zhuzhou, Hunan, Peoples R China.;[Hu, Jiang-Tao; Zhao, Fu-Yun] 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：
Buoyancy;Electronic cooling;Enclosures;Energy conservation;Intelligent buildings;Mass transfer;Moisture control;Walls (structural partitions);Heat and mass transfer;Heat and moisture transports;Horizontal walls;Inhibition effect;Moisture transport;Ordered arrangement;Sustainable building;Transport structure;Transport properties
摘要：
Combined heat and moisture transportation in an enclosure has been numerically investigated, which could benefit the sustainable building energy conservations and electronic cooling designs. An adiabatic and impermeable partition of finite thickness is considered, placed in the enclosure following an ordered arrangement. Effects of length and location of the partition, buoyancy ratio and thermal Rayleigh number on convective heat and moisture transfer rates in the enclosure are discussed. Firstly, this situation of the partition placed in the horizontal wall is studied, where inhibition effect of partition is observed. It is seen that the location of partition put relatively weaker influences on the heat and mass transfer in the regime of thermal-driven flow, when its length exceeds the critical value. Additionally, inhibition effect is more pronounced as the partition is fixed in center of vertical wall. Furthermore, local heat and mass transfer rates could be suppressed when the buoyancy ratio becomes negative. Finally, thermal Rayleigh number greatly affects the transport structures of fluid, heat and moisture, whatever aiding flow or opposing flow situations. Heat and mass transfer potentials could be promoted with increasing thermal Rayleigh numbers. Present work could be adopted to optimize the enclosure flows simultaneously with heat and moisture transport. © 2017, © 2017 Taylor & Francis Group, LLC.
语种：
英文
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Thermal buoyancy driven canyon airflows inside the compact urban blocks saturated with very weak synoptic wind: Plume merging mechanism
作者：
Mei, Shuo-Jun;Hu, Jiang-Tao;Liu, Di;Zhao, Fu-Yun* ;Li, Yuguo;...
期刊：
Building and Environment ,2018年131:32-43 ISSN：0360-1323
通讯作者：
Zhao, Fu-Yun
作者机构：
[Hu, Jiang-Tao; Zhao, Fu-Yun; Mei, Shuo-Jun] Wuhan Univ, Minist Educ, Key Lab Hydraul Machinery Transients, 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 Southern 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 Southern Rd, Wuhan 430072, Hubei, Peoples R China.
关键词：
Buoyancy-driven ventilation;Thermal plumes merging;Urban city size;Urban heat island;Urban street canyon
摘要：
During the sunny days with very weak wind, thermal buoyancy forces will play a crucial role in the airflow and urban thermal environment. The merging effect of urban building plumes is particularly investigated by the use of unsteady Reynolds-averaged Navier Stokes (URANS) methodology. After testing against benchmark theoretical results, the SST k-ω model showing better performance in capturing the near wall processes and it was adopted to simulate the urban turbulent flows. The airflow patterns and temperature fields are analyzed for seven urban sizes ranging from 3 to 10 rows of buildings and six aspect ratios ranging from 0.5 to 3.0. The merging of thermal plumes induces a horizontal convergence flow, resulting in stagnant region at the urban center. A typical urban heat island temperature distribution with a peak value at the urban center is then found. Additionally, with the increase of urban size, the averaged velocity with the canyon decreases and averaged temperature increases. The average velocity within the street canyon decreases monotonously and the vortices number increases with the aspect ratio (building height H to the street width W). The average temperature also increases with aspect ratio, except when the aspect ratio increases from 2.0 to 2.5, where the flow structure within the street canyon changes from a three vortices structure into a four vortices structure. This research could provide a new idea about how urban heat island is formed and the relation between its intensity with urban size and geometry. © 2018 Elsevier Ltd
语种：
英文
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Bio-oxidation of a high-sulfur and high-arsenic refractory gold concentrate using a two-stage process
作者：
Wang, Guohua* ;Xie, Shuibo;Liu, Xinxing;Wu, Yonghong;Liu, Yingjiu;...
期刊：
Minerals Engineering ,2018年120:94-101 ISSN：0892-6875
通讯作者：
Wang, Guohua
作者机构：
[Xie, Shuibo; Liu, Yingjiu; Zeng, Taotao; Wang, Guohua] Univ South China, Hunan Prov Key Lab Pollut Control & Resources Reu, Hengyang 421001, Peoples R China.;[Liu, Xinxing; Wu, Yonghong] Cent S Univ, Sch Minerals Proc & Bioengn, Changsha 410083, Hunan, Peoples R China.;[Liu, Xinxing; Wu, Yonghong] Cent S Univ, Minist Educ, Key Lab Biohydromet, Changsha 410083, Hunan, Peoples R China.
通讯机构：
[Wang, Guohua] U;Univ South China, Hunan Prov Key Lab Pollut Control & Resources Reu, Hengyang 421001, Peoples R China.
关键词：
Arsenic;Chemical analysis;Energy dispersive spectroscopy;Gold;Oxidation;Refractory materials;Scanning electron microscopy;Sulfur;Surface analysis;X ray spectroscopy;Arsenopyrite;Bio-oxidation;Biological oxidations;Chemical oxidation;Energy dispersive X ray spectroscopy;Gold concentrate;High temperature;Two-stage process;X ray photoelectron spectroscopy
摘要：
To improve the oxidation rate of high-sulfur and high-arsenic refractory gold concentrate (HGC), a two-stage chemical-biological oxidation approach, which contained a high-temperature chemical oxidation stage (ferric-leaching stage) and a subsequent biological oxidation stage with mesophiles, was used in this experiment. The surface analysis of pure arsenopyrite using scanning electron microscope (SEM), Energy Dispersive X-ray Spectroscopy (EDX) and X-ray photoelectron spectroscopy (XPS) indicated that the surface lattice structure was partly disrupted after chemical oxidation; as a result, the subsequent biological oxidation rate during the second stage improved significantly. The extraction levels of Fe, As and S were 49.8%, 50.4% and 51.0%, respectively, in the normal biological oxidation system, while the values increased to 63.3%, 64.2% and 63.3%, respectively, following the two-stage process. Accordingly, the recovery rate of gold increased by 16.8% using the two-stage process compared to that of the one-stage biological oxidation approach. © 2018 Elsevier Ltd
语种：
英文
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稀土镧掺杂纳米二氧化钛复合保鲜包装薄膜的研究
作者：
郭韵恬;王汉青
期刊：
材料导报 ,2018年32(24):4357-4362 ISSN：1005-023X
通讯作者：
Wang, Hanqing(hqwang2011@126.com)
作者机构：
[郭韵恬] School of Urban and Environmental, Hunan University of Technology, Zhuzhou;412007, China;[王汉青] School of Civil Engineering, University of South China, Hengyang;421000, China;[郭韵恬] 412007, China
通讯机构：
[Wang, H.] S;School of Civil Engineering, China
关键词：
稀土镧;纳米二氧化钛;复合包装薄膜;阻隔性能;保鲜性能
摘要：
水果和菌类均为货架期较短的商品,二者皆易因呼吸作用与微生物感染导致失水与腐坏。本工作首次报道了将稀土镧掺杂纳米TiO_2(La~(3+) -TiO_2)粒子与PVA共混,采用溶液浇铸法制备了La~(3+) -TiO_2复合包装薄膜,并将其用于草莓和姬松茸保鲜的探索研究。XRD、SEM和LPSA表征显示,稀土镧的掺杂引起了纳米TiO_2晶格的畸变,其粒径变小、表面能增大,掺杂后的纳米TiO_2在PVA基体中的分散性得到提高。透湿和透氧率检测结果表明,La~(3+) -TiO_2的加入有利于复合薄膜阻隔性能的增加,当La~(3+) -TiO_2质量分数为1.6%时,透湿率降低45.9%,透氧率降低38.0%,复合薄膜阻隔性能最佳。抗菌率检测结果显示,稀土镧的掺杂拓宽了TiO_2对光谱的利用范围,复合包装薄膜在自然光下对大肠杆菌和金黄葡萄球菌的杀灭率分别达到84.1%和91.8%。保鲜实验结果表明,复合包装薄膜因其优良的阻隔性和抗菌性,有效抑制了草莓贮存过程中的果实腐坏和质量损失,常温下将草莓的保质期从5d延长至10d左右;同时复合薄膜可减缓姬松茸贮藏过程中的自溶和褐变等现象,常温下将姬松茸的保质期从2d延长至4d左右,其包装保鲜效果良好。
语种：
中文
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Buoyancy driven heat and species transports inside an energy storage enclosure partially saturated with thermal generating porous layers
作者：
Hu, Jiang-Tao;Mei, Shuo-Jun;Liu, Di;Zhao, Fu-Yun* ;Wang, Han-Qing
期刊：
International Journal of Thermal Sciences ,2018年126:38-55 ISSN：1290-0729
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 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：
Boundary layers;Buoyancy;Diffusion in liquids;Energy storage;Heat generation;Heat storage;Heat transfer;Intelligent buildings;Mass transfer;Moisture;Moisture control;Porous materials;Walls (structural partitions);Coefficient ratios;Enclosure flows;Internal heat generation;Porous medium;Thermal storage wall;Enclosures
摘要：
Combined thermal and moisture convections in an enclosure partially filled with porous medium are numerically and analytically investigated, aiming to enhance moisture transport in the thermal energy storage unit. Two representative configurations of porous layers were taken into considerations, being placed centrally in the space or attached to the vertical walls. Moist air motions are simultaneously driven by the internal heat generation and external concentration difference imposed across the enclosure. Effects of Darcy number, mass diffusion coefficient, thermal Rayleigh number and buoyancy ratio on the heat and moisture transfer across the enclosure are discussed. Heat and mass transfer of the fluid/porous interface is analyzed as a function of the permeability of the porous layer. In the extreme case of high permeability and solutal-driven flow, a scale analysis is applied to predict the order of magnitudes involved in the boundary layer regime. Also, correlations for the average Nusselt and Sherwood numbers based on discrete numerical results are proposed. There is an agreement between the analytical and numerical results of moisture transfer rate, while a slight difference of heat transfer rate is observed due to different configurations of porous layers were imposed. Present research could benefit future development of sustainable building energy storage. © 2017 Elsevier Masson SAS
语种：
英文
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Effect of gamma-ray irradiation on the dewaterability of waste activated sludge
作者：
Wu, Yuqi;Jiang, Yinghe* ;Ke, Guojun;Liu, Yingjiu
期刊：
Radiation Physics and Chemistry ,2017年130:164-170 ISSN：0969-806X
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; Liu, Yingjiu; 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：
Sludge dewaterability;Gamma-ray irradiation;Soluble chemistry oxygen demand;Extracellular polymeric substances;Particle size
摘要：
The effect of gamma-ray irradiation on waste activated sludge (WAS) dewaterability was investigated with irradiation doses of 0–15 kGy. Time to filter (TTF50), specific resistance of filtration (SRF) and water content of sludge cake were measured to evaluate sludge dewaterability. Soluble chemical oxygen demand (SCOD), soluble extracellular polymeric substances (EPS) concentration and sludge particle size were determined to explain changes in sludge dewaterability. The optimal irradiation dose to obtain the maximum dewaterability characteristics was 1–4 kGy, which generated sludge with optimal disintegration (1.5–4.0%), soluble EPS concentration (590–750 mg/L) and particle size distribution (100–115 µm diameter). The combination of irradiation and cationic polyacrylamide (CPAM) addition exhibited minimal synergistic effect on increasing sludge dewatering rate compared with CPAM conditioning alone.
语种：
英文
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Sono-assisted preparation of Fe(II)-Al(III) layered double hydroxides and their application for removing uranium (VI)
作者：
Xie, Lixia;Zhong, Yu* ;Xiang, Renjun* ;Fu, Guangyi;Xu, Youze;...
期刊：
Chemical Engineering Journal ,2017年328:574-584 ISSN：1385-8947
通讯作者：
Zhong, Yu;Xiang, Renjun
作者机构：
[Xie, Lixia] Hunan Univ, Coll Chem & Chem Engn, State Key Lab Chemo Biosensing & Chemometr, Changsha 410082, Hunan, Peoples R China.;[Wen, Tao; Xiang, Renjun; Cheng, Yingxiang; Fu, Guangyi; Zhao, Yuanyuan; Zhong, Yu; Xu, Youze; Xie, Lixia; Liu, Zhan; Xiang, RJ] Hunan Res Acad Environm Sci, Key Lab Water Pollut Control Technol, Changsha 410004, Hunan, Peoples R China.;[Liu, Xingqun] Univ South China, Inst Urban Construct, Hengyang 421001, Peoples R China.
通讯机构：
[Zhong, Y; Xiang, RJ] H;Hunan Res Acad Environm Sci, Key Lab Water Pollut Control Technol, Changsha 410004, Hunan, Peoples R China.
关键词：
Adsorption;Fe(II)-Al(III) layered double hydroxides;Reaction mechanisms;Ultrasound irradiation;Uranium
摘要：
Fe(II)-Al(III) layered double hydroxides (Fe-Al LDHs) were prepared by the sono-assisted precipitation method and used for the removal of uranium (VI) from aqueous solutions. The application of ultrasound in the Fe-Al LDHs preparation promoted the formation of the hydrotalcite-like phase and improved the adsorption capacity of U(VI). Batch experiments were carried out to investigate the influence of solid-to-solution ratio, initial U(VI) concentration, initial pH, contact time and temperature on the U(VI) removal process. The experimental results indicated that the removal process of U(VI) could be well described by the pseudo-second-order kinetic model. The equilibrium isotherm for U(VI) removal was fitted by the Langmuir model and the maximum adsorption capacity of Fe-Al LDHs was 113.64 mg/g at a temperature of 308 K. The thermodynamic parameters implied that the removal of U(VI) was essentially an endothermic process. The FT-IR, EDX and XPS results suggested that the removal mechanism involves combined adsorption-reduction processes. When the U(VI) ions absorbed onto the Fe-Al LDHs through physical adsorption, the Fe(II) in the structure of Fe-Al LDHs reduces U(VI) to U(IV) while Fe(II) was oxidized to Fe(III). (C) 2017 Elsevier B.V. All rights reserved.
语种：
英文
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混凝土碱骨料反应及力学性能细观模拟
作者：
宋百姓;柯国军;潘坚文
期刊：
工程力学 ,2017年34(4):134-139 ISSN：1000-4750
通讯作者：
Pan, Jian-Wen(panjianwen@tsinghua.edu.cn)
作者机构：
[宋百姓; 柯国军] School of Urban Construction, University of South China, Hengyang;Hunan;421001, China;[潘坚文] State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing;100084, China
通讯机构：
[Pan, J.-W.] S;State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing, China
关键词：
混凝土;碱骨料反应;细观;力学性能;模拟
摘要：
混凝土碱骨料反应是降低混凝土耐久性的主要因素之一,充分认识其对混凝土力学性能的劣化机理,有助于防治碱骨料反应对混凝土结构的危害。该文用颗粒元(PFC2D)方法建立了由骨料、砂浆和界面三相共同组成的混凝土细观模型,模拟了碱骨料反应引起的混凝土膨胀变形与微裂缝扩展过程,并对碱骨料反应劣化后的混凝土试件进行劈裂抗拉试验,研究碱骨料反应对混凝土力学性能的影响。数值模拟结果表明,该模型可有效预测混凝土碱骨料反应膨胀趋势,碱骨料反应显著降低了混凝土的劈裂抗拉强度。
语种：
中文
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Three-point bending deflection and failure mechanism map of sandwich beams with second-order hierarchical corrugated truss core
作者：
Li, Gang;Fang, Yaochu;Hao, Peng* ;Li, Zhaokai
期刊：
Journal of Sandwich Structures & Materials ,2017年19(1):83-107 ISSN：1099-6362
通讯作者：
Hao, Peng
作者机构：
[Li, Gang; Li, Zhaokai; Hao, Peng] Dalian Univ Technol, State Key Lab Struct Anal Ind Equipment, Dept Engn Mech, Dalian, Peoples R China.;[Fang, Yaochu] Univ South China, Sch Urban Construct, Hengyang 421001, Peoples R China.
通讯机构：
[Hao, Peng] D;Dalian Univ Technol, State Key Lab Struct Anal Ind Equipment, Dept Engn Mech, Dalian, Peoples R China.
关键词：
Bending (forming);Composite beams and girders;Failure (mechanical);Failure modes;Finite element method;Sandwich structures;Struts;Trusses;Correction factors;Failure mechanism;Sandwich beams;Three point bending;Truss core;Buckling
摘要：
For sandwich beams with second-order hierarchical corrugated truss core under threepoint bending, a correction factor of shear deflection was firstly proposed to improve the prediction accuracy of the bending analysis, which was verified by finite element analysis and compared with the original formula. Then, the failure modes of the sandwich beam under bending were analyzed, including four competing modes of the large struts (i.e. plastic yielding, buckling, wrinkling of facesheet, shear buckling) and two competing modes of the small struts (i.e. plastic yielding, buckling). Subsequently, the analytical expressions of critical load for each failure mode were derived. On this basis, the failure mechanism maps were constructed. Finally, several typical points from the map were selected and verified by finite element analysis, and a good agreement of predicted failure modes was observed. © The Author(s) 2015.
语种：
英文
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Study on immobilization and migration of nuclide u in superficial soil of uranium tailings pond
作者：
Chang, Zhe;Zhou, Shukui*
期刊：
IOP Conference Series: Earth and Environmental Science ,2017年64(1):012021 ISSN：1755-1307
通讯作者：
Zhou, Shukui
作者机构：
[Chang, Zhe; Zhou, Shukui] Univ South China, Sch Civil Engn, Hengyang, Peoples R China.
通讯机构：
[Zhou, Shukui] U;Univ South China, Sch Civil Engn, Hengyang, Peoples R China.
会议地点：
Ordos, PEOPLES R CHINA
会议主办单位：
[Chang, Zhe;Zhou, Shukui] Univ South China, Sch Civil Engn, Hengyang, Peoples R China.
会议论文集名称：
IOP Conference Series-Earth and Environmental Science
关键词：
Acid rain;Environmental engineering;Isotopes;Lime;Natural resources exploration;Precipitation (meteorology);Rain;Soils;Ammonium phosphates;Cumulative precipitation;Different soils;Rain leaching;Re-precipitation;Southern China;Tailings pond;Tailings soils;Uranium
摘要：
The uranium tailings in southern China was used as the object of study to study the fixation and migration characteristics of nuclide U in shallow tailings. The results showed that the precipitation of tailings in the tailings soil was not linearly related to the depth during the acid rain leaching process. Tailings soil in the role of fixatives, when the lime as a fixative, the tailings of different soil uranium in 20 days after the re-precipitation. However, when lime and ammonium phosphate were used as fixing agents, the cumulative precipitation of U had a significant effect, and the migration of uranium was inhibited. © Published under licence by IOP Publishing Ltd.
语种：
英文
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