租赁住房消防安全技术研究初探
作者:
黄晓家;刘广阳;曹薇;吴懂礼;于水静
期刊:
住宅产业 ,2020年(12):26-32 ISSN:1672-9013
作者机构:
1. 中国中元国际工程有限公司;2. 南华大学土木工程学院
关键词:
租赁住房;消防安全;火灾危险性;疏散走道宽度
摘要:
本文分析了我国住房制度的发展与特征,依据火灾统计数据分析了"一张床"、"一间房"和"一小套房"的三种租赁住房的火灾危险性分析,提出了租赁住房的消防设计原则,归纳汇总各地改造项目中实施租赁住房存在的消防工程问题,通过火灾危险性分析,提出公寓的火灾危险性高于旅馆,对于消防设施的设置应适当提高标准,通过疏散模拟分析,提出了宿舍楼疏散等效替代技术措施,对于8人居住的宿舍楼,同时增加走道的宽度和安全出口宽度可有效提高疏散的安全性。
语种:
中文
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水热合成对低等级粉煤灰活性的影响
作者:
谭天戈;柯国军;陈聪;邹品玉
期刊:
南华大学学报(自然科学版) ,2020年34(03):25-30 ISSN:1673-0062
作者机构:
南华大学 土木工程学院,湖南 衡阳421001;[谭天戈; 柯国军; 陈聪; 邹品玉] 南华大学
关键词:
低等级粉煤灰;水泥胶砂;水热合成;粉煤灰活性
摘要:
低等级粉煤灰由于活性低,需通过一些方法将其活性激活后再利用.为研究粉煤灰活性,通过水热合成的方法激发其活性,然后测试其力学性能及微观分析.将低等级粉煤灰分别以10%、20%、30%、40%的掺量等质量代替水泥制作胶砂试件,在1.3 MP a、180℃的条件下蒸压10 h后分别标养7 d、60 d、90 d后测试其抗折抗压强度,并做XRD分析.结果表明,高温高压条件下养护提高了试件强度,激发了粉煤灰活性;随着养护时间增长,试件强度逐渐提高,且代替水泥掺量在20% ~30%时效果较好.
语种:
中文
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Manganese ferrite/porous graphite carbon nitride composites for U(VI) adsorption from aqueous solutions
作者:
Ge, Yujie;He, Zhiqiang;Wu, Jiao;Wang, Guohua;Xie, Shuibo;...
期刊:
Journal of Radioanalytical and Nuclear Chemistry ,2020年326(1):157-171 ISSN:0236-5731
通讯作者:
Liu, Jinxiang
作者机构:
[Ge, Yujie; Xie, Shuibo; Wu, Jiao; Wang, Guohua; He, Zhiqiang] Univ South China, Sch Civil Engn, Hengyang 421001, Peoples R China.;[Xie, Shuibo; Liu, Jinxiang] Univ South China, Hunan Prov Key Lab Pollut Control & Resources Tec, Hengyang 421001, Peoples R China.
通讯机构:
[Liu, Jinxiang] U;Univ South China, Hunan Prov Key Lab Pollut Control & Resources Tec, Hengyang 421001, Peoples R China.
关键词:
Magnetic;Porous graphite carbon nitride;U(VI);Adsorption
摘要:
Manganese ferrite/porous graphite carbon nitride composites (MnFe2O4/porous g-C3N4[PCN]) were synthesized by template-assisted thermal polymerization and hydrothermal method and applied for high adsorption of U(VI) from aqueous solution. Results indicated that the maximum adsorption capacity of MnFe2O4/PCN (MPCN) was 367.9 mg g−1 under optimum conditions (pH = 5, t = 15 min, and T = 308 K), which was higher than that of g-C3N4 (185.1 mg g−1). Adsorption was well fitted with Langmuir isotherm model and pseudo-second-order kinetic equation. Thermodynamic analysis showed that adsorption is an endothermic, spontaneous process. X-ray photoelectron spectra revealed that amino and metal oxygen groups are involved in the complexing adsorption of uranium. Adsorption efficiency remained 92.5% after five adsorption–desorption cycles. The results of this paper indicated that MnFe2O4/PCN composites can be efficiently used as an ideal material for U(VI) adsorption. © 2020, Akadémiai Kiadó, Budapest, Hungary.
语种:
英文
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Optimal Receiver Placement for K-barrier Coverage in Passive Bistatic Radar Sensor Networks
作者:
Chen, Jiaoyan;Yang, Laurence T.;Deng, Xianjun* ;Hong, Xianggong;Yi, Lingzhi
期刊:
ACM Transactions on Internet Technology ,2020年20(3):24:1-24:23 ISSN:1533-5399
通讯作者:
Deng, Xianjun
作者机构:
[Hong, Xianggong; Chen, Jiaoyan] Nanchang Univ, Sch Informat & Engn, Nanchang 330031, Jiangxi, Peoples R China.;[Yang, Laurence T.] St Francis Xavier Univ, Dept Comp Sci, Antigonish, NS B2G 2W5, Canada.;[Deng, Xianjun] Univ South China, Sch Elect Engn, Hengyang 421001, Hunan, Peoples R China.;[Yi, Lingzhi] Univ South China, Sch Civil Engn, Hengyang 421001, Hunan, Peoples R China.
通讯机构:
[Deng, Xianjun] U;Univ South China, Sch Elect Engn, Hengyang 421001, Hunan, Peoples R China.
关键词:
K-barrier coverage;minimum receiver problem;Passive bistatic radar network
摘要:
The improvement of coverage quality in the construction of multiple-barrier coverage is a critical problem in a wireless sensor network. In this article, we investigate the K-barrier coverage construction problem in passive bistatic radar sensor networks. In contrast to traditional bistatic radar networks, the transmitters in a passive bistatic radar network are predeployed and noncooperative. To construct K barriers, we need to deploy receivers that couple with predeployed transmitters to build continuous barriers. In this work, we focus on the minimum number of receivers problem of constructing K-barrier coverage, where the minimum number of receivers is based on the predeployed transmitters. To handle this problem, we first investigate the optimal placement of receivers between adjacent transmitters for a sub-barrier formation and then determine the optimal placement of receivers for the one-barrier construction. For multiple-barrier coverage construction, we introduce a weighted transmitter graph (WTG) to describe the relation among different transmitters, where the weight in the graph is the minimum number of receivers needed for these two transmitters for a sub-barrier formation. Based on WTG, the minimum receivers problem changes to a problem of how to find K-disjoint paths with the minimum total weight in the graph. For large-scale networks, we also propose two efficient heuristic algorithms to solve the corresponding problem. Finally, we conduct extensive experiments to validate the correctness and the efficiency of the proposed algorithms. © 2020 ACM.
语种:
英文
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Electrokinetic remediation of uranium(VI)-contaminated red soil using composite electrolyte of citric acid and ferric chloride
作者:
Xiao, Jiang;Zhou, Shukui* ;Chu, Luping;Liu, Yinjiu;Li, Jiali;...
期刊:
Environmental Science and Pollution Research ,2020年27(4):4478-4488 ISSN:0944-1344
通讯作者:
Zhou, Shukui
作者机构:
[Tian, Linyu; Li, Jiali; Liu, Yinjiu; Zhang, Jian; Xiao, Jiang; Chu, Luping; Zhou, Shukui] Univ South China, Sch Civil Engn, Hengyang 421001, Peoples R China.
通讯机构:
[Zhou, Shukui] U;Univ South China, Sch Civil Engn, Hengyang 421001, Peoples R China.
会议名称:
14th International Francophone Symposium on Aquatic Ecotoxicology (EcoBIM) - From Legacy Pollutants to Emerging Contaminants
会议时间:
MAY 22-25, 2018
会议地点:
Univ Bordeaux, Bordeaux, FRANCE
会议主办单位:
Univ Bordeaux
关键词:
Composite electrolyte;Electrokinetic remediation;Red soil;Uranium
摘要:
In the process of electrokinetic (EK) remediation of uranium-contaminated soil, the existence form of uranium in soil pore fluid will affect on its migration behavior. In this paper, a novel type of electrolyte (citric acid + ferric chloride, CA+ FeCl3) has been investigated for the EK remediation of uranium-contaminated red soil. The effects of different electrolyte and the concentrations of FeCl3 on migration behavior of U(VI) and environmental risks were investigated after EK remediation. The result showed that the optimum concentration was 0.1 mol/L CA mixed with 0.03 mol/L FeCl3 in this study. At this time, the removal efficiency of uranium was about 61.55 +/- 0.41%, and the cumulative energy consumption was 0.2559 kWh. Compared with deionized water and single CA, combined CA with FeCl3 has the advantages of high removal efficiency, low leaching toxicity, and less damage to the soil after the electrokinetic remediation treatment.
语种:
英文
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基于Workbench的输流弯管流固耦合分析
作者:
谌冉曦;韩天宇;郭长青;刘颖
期刊:
南华大学学报(自然科学版) ,2020年34(2):69-73+81-82 ISSN:1673-0062
作者机构:
南华大学 土木工程学院,湖南 衡阳421001;南华大学 数理学院,湖南 衡阳421001;[刘颖; 郭长青; 谌冉曦; 韩天宇] 南华大学
关键词:
流固耦合;弯管
摘要:
运用ANSYS Workbench软件建立不同弯曲半径的弯管模型,分析了弯曲半径对所受流体压力以及内部流速分布的影响,得到了弯曲半径和管道入口压强对固有频率和整体变形的关系。结果表明:弯曲半径对流速分布影响显著,弯头处内侧流速大,外侧流速小;弯曲半径对弯头后段内壁压力影响显著;弯头处内侧受压小,外侧受压大;弯曲半径对整体变形的影响较小,而管道入口压强对整体变形的影响大;管道2、3阶固有频率随着弯曲半径的增大有下降趋势,随着弯曲半径的增大4阶固有频率增大明显。
语种:
中文
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智能遮阳百叶技术研究进展
作者:
徐俊彦;王汉青
期刊:
建筑热能通风空调 ,2020年39(12):54-58 ISSN:1003-0344
作者机构:
南华大学土木工程学院;建筑环境控制技术湖南省工程实验室;建筑节能与环境控制衡阳市重点实验室;[王汉青] 中南林业科技大学;[徐俊彦] 南华大学
关键词:
智能遮阳;建筑节能;节能设计;遮阳百叶
摘要:
本文分别从智能遮阳百叶的实验研究和基于三种模拟软件对智能遮阳百叶的模拟研究两方面回顾了智能遮阳百叶技术的研究进展,最后对迫切需要解决的问题和未来发展的方向进行了探讨。
语种:
中文
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槽式太阳能集热器集热管热性能影响因素分析
作者:
王蒙;顾炜莉;易小芳;刘亚君
期刊:
建筑热能通风空调 ,2020年39(10):12-15+34 ISSN:1003-0344
作者机构:
南华大学土木工程学院;[王蒙; 易小芳; 顾炜莉; 刘亚君] 南华大学
关键词:
槽式太阳能集热器;数值模拟;能流密度;热性能
摘要:
本文运用蒙特卡罗光线追踪法模拟了不同辐射强度下LS-2型槽式太阳能集热器集热管上的能流密度分布,集热管正面与背面能流密度差值较大。以此为基础,通过数值模拟的方式分别从太阳辐射强度、集热管入口流体温度和流速、管壁粗糙度等角度模拟分析了其对集热器的集热效率、集热管内流体的温升、压损等集热管热性能的影响,其中增强太阳辐射在一定程度上能提高集热效率,而入口流体温度和流速、管壁粗糙度的增大均会造成一些不利影响。
语种:
中文
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Adsorption performance and mechanism of U(VI) by hydroxy-aluminum impregnated chitosan
作者:
Yang, Jinhui* ;Li, Chuanshu;Dai, Yanghong;Yang, Bing;Wang, Jingsong;...
期刊:
Desalination and Water Treatment ,2020年180:293-302 ISSN:1944-3994
通讯作者:
Yang, Jinhui
作者机构:
[Wang, Jingsong; Lei, Zengjiang; Li, Chuanshu; Luo, Yi; Yang, Jinhui; Zhou, Shukui] Univ South China, Sch Civil Engn, Hunan Prov Key Lab Pollut Control & Resources Reu, Hengyang 421001, Peoples R China.;[Dai, Yanghong] CGNPC Nucl Power Operat Co Ltd, Shenzhen 518000, Peoples R China.;[Yang, Bing] Hunan Nucl Sanli Technol Engn Co Ltd, Hengyang 421001, Peoples R China.
通讯机构:
[Yang, Jinhui] U;Univ South China, Sch Civil Engn, Hunan Prov Key Lab Pollut Control & Resources Reu, Hengyang 421001, Peoples R China.
关键词:
Adsorption performance;Al-CTS;Reaction mechanism;U(VI)
摘要:
A novel adsorbent of hydroxy-aluminum impregnated chitosan (Al-CTS) was fabricated via in-situ hydrolysis and impregnation technique for the removal of U(VI) from aqueous solutions in this study. Al-CTS was characterized by scanning electron microscopy (SEM), Fourier transforms infra-red spectroscopy and X-ray photoelectron spectroscopy, to explore the adsorption properties and the reaction mechanism of Al-CTS for U(VI). The results showed that hydroxy-aluminum (AlOOH) was successfully loaded on the CTS surface. The consequence revealed that surface complex between Al–O bond, –NH2 group, –OH group and U(VI) may participate in the adsorption processes, and the main mechanism is the surface complexation of the internal sphere. This process fitted well with quasi-second-order kinetic model (R2 > 0.99), Langmuir and Freundlich isothermal model (R2 > 0.98). Compared with CTS, the adsorption capacity of Al-CTS for U(VI) increased by 23.85 mg/g, and the cationic interference degree was small. It is expected to be used to separate and recover uranium from radioactive wastewater. © 2020 Desalination Publications. All rights reserved.
语种:
英文
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Performance of capillary ceiling cooling panel on ceiling surface temperature and indoor thermal environment
作者:
Xie, Dong;Wang, Chenhua;Yu, Chuck Wah;Wang, Yun;Wang, Hanqing*
期刊:
Indoor and Built Environment ,2020年29(6):881-894 ISSN:1420-326X
通讯作者:
Wang, Hanqing
作者机构:
[Wang, Chenhua; Xie, Dong; Wang, Yun; Yu, Chuck Wah] Univ South China, Sch Civil Engn, Hengyang, Peoples R China.;[Yu, Chuck Wah] ISBE, Milton Keynes, Bucks, England.;[Wang, Hanqing] Cent South Univ Forestry & Technol, Sch Civil Engn, Changsha 410211, Peoples R China.
通讯机构:
[Wang, Hanqing] C;Cent South Univ Forestry & Technol, Sch Civil Engn, Changsha 410211, Peoples R China.
关键词:
Capillary ceiling panel;Radiant cooling;CFD simulation;Surface temperature;Thermal environment
摘要:
A new experimental methodology is presented to show the effect of water supply temperature, mass flow rate and thermal load distribution on the radiant ceiling capacity and thermal comfort conditions. Computerized fluid dynamics simulated vertical temperatures and velocities profiles were validated by a comparison with experimental results and the difference was within 10%. Uniform surface temperature distribution was achieved in a 45.6 m(3) test room installed with capillary ceiling radiant cooling panels by an increase in water temperature and air supply velocity. When the ventilation system was turned off, the mean ceiling surface temperature rose from 16.9 +/- 0.4 degrees C to 21.5 +/- 0.3 degrees C with a rise in the inlet water temperature to 20.1 degrees C. The temperature difference between the head and ankle of an occupant was 2.0 degrees C, which complies with the Chinese standard, GB/T 18049-2017. At a height of 1-1.5 m, the maximum temperature fluctuation was 2 degrees C in the horizontal direction. When the ventilation system was turned on, with the air supply temperature and velocity at 19.8 degrees C and 1.11 m s(-1), the ceiling surface temperature was increased by 0.5 degrees C. The indoor air temperature has a positive correlation with the air supply temperature and internal heat load but a negative correlation with air supply velocity.
语种:
英文
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衡阳农宅现状调查与节能分析
作者:
李志;罗清海;李思燕;高瑞霞
期刊:
农村经济与科技 ,2020年31(7):338-340,390 ISSN:1007-7103
作者机构:
南华大学 土木工程学院,湖南 衡阳 421000;[高瑞霞; 李志; 李思燕; 罗清海] 南华大学
关键词:
农村住宅;热工性能;节能分析;能耗模拟
摘要:
通过对衡阳农村地区住宅的结构形式、围护结构材料、室内热环境及用能现状等进行问卷调查和实地测试,分析了该地区农宅典型围护结构的热工性能,并提出一种适合衡阳新农村住宅建设的农宅节能方案,最后使用energyplus软件对衡阳地区的普通农宅和提出的节能型新农宅进行了能耗模拟对比分析。结果表明,节能农宅具有较好的节能效果。
语种:
中文
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信息化教学在土木类专业课程教学中的应用
作者:
王国华;李仕友;曾涛涛;杨金辉;袁华山#WANG Guohua;...
期刊:
科技创新导报 ,2020年17(36):221-223 ISSN:1674-098X
作者机构:
南华大学土木工程学院 湖南衡阳 421001;[杨金辉; 曾涛涛; 李仕友; 袁华山#WANG Guohua; 王国华] 南华大学
关键词:
信息化教学;教学模式;改革;自主学习
摘要:
《水处理新技术》具有课程内容多、课堂教学时间有限、生物学背景知识要求较高等特点,土木类专业的学生要系统地掌握水处理新工艺,就必须具备自主学习能力,掌握正确的学习方式及获取信息的能力.信息化教学的推广及普及,给学生的学习方式带来革命性影响.本文将土木专业学生学习水处理新技术的症结入手,分析信息化教学在土木专业学生专业课程的必要性,探索并提出在信息化教学背景下学生对土木类专业课程的自主学习策略,从而激发学生的学习兴趣,提高其学习效率.
语种:
中文
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矩形受剪切空间褶皱薄膜弹性应变能和主应力有限元分析
作者:
肖潇;章桥;关富玲
期刊:
空间结构 ,2020年26(02):3-10 ISSN:1006-6578
作者机构:
南华大学土木工程学院,湖南衡阳421001;南华大学长三角(诸暨)研究院有限公司,浙江诸暨311800;浙江大学空间结构研究中心,浙江杭州310058;[章桥; 肖潇] 南华大学;[关富玲] 浙江大学
关键词:
空间薄膜结构;褶皱;有限元分析;弹性应变能;主应力分布
摘要:
薄膜因其厚度薄、抗弯刚度小,当外载荷产生的压应力超过临界压应力时,会出现局部屈曲现象而形成褶皱.褶皱的出现不仅会影响薄膜结构的表面精度,还会改变结构的应力分布状态,进而影响结构的静力和动力特性.研究褶皱的影响因素及其机理,对准确预测薄膜褶皱变形、有效控制或消除褶皱变形,具有重要的意义.本文对矩形受剪切空间薄膜的褶皱进行数值分析.首先,运用非线性屈曲法、直接干扰法以及显式动力法分别对薄膜结构的褶皱进行分析,研究褶皱的数量、褶皱的几何信息与分布情况,并通过与实验结果的对比,验证数值分析方法的正确性.其次,在非线性屈曲法、直接干扰法和显式动力法中选取最合适的方法,以非线性有限元软件ABAQUS为平台,在不同网格密度、不同膜材厚度和不同加载条件下对矩形薄膜受剪切褶皱进行进一步分析,以分析薄膜结构的能量和应力分布,具体包括应变能密度分布、整个薄膜所具有的能量以及主应力分布情况.本研究可为空间薄膜结构褶皱的进一步研究、薄膜结构膜材的选择以及形状控制等提供参考.
语种:
中文
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给排水科学与工程专业“水处理微生物学”教学改革与探索
作者:
曾涛涛;张晓玲;胡青;王国华;周玉林
期刊:
科技创新导报 ,2020年17(19):193-197 ISSN:1674-098X
作者机构:
南华大学土木工程学院 湖南衡阳 421001;南华大学研究生院 湖南衡阳 421001;[曾涛涛; 王国华; 张晓玲; 胡青; 周玉林] 南华大学
关键词:
水处理微生物学;给排水科学与工程;专业认证;创新能力;研讨式教学
摘要:
"水处理微生物学"是给排水科学与工程专业三大学科基础课程之一,为其他专业课程提供微生物学基础。为了让该课程更好地发挥学科基础课作用,作者分析了学生基础,在教学内容方面构建"强理论、重实践"的课程体系,以专业认证要求为指导,紧扣行业发展趋势。在教学方式上,采用启发式教学、研讨式教学与"学习通"网络教学法等措施进行教学改革与探索。改革效果显示,学生创新能力提高显著,参与大学生创新计划、发表学术期刊论文或获授权专利的学生均表示从课程改革中受益;实验操作能力提高显著,绝大部分学生对课程非常满意。该课程改革与探索为提高学生学习兴趣与创新能力起到了良好促进作用。
语种:
中文
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疫情期间工科专业基础课线上教学设计与实践——以工程热力学与传热学为例
作者:
顾炜莉
期刊:
中国教育技术装备 ,2020年(13):76-77,84 ISSN:1671-489X
作者机构:
南华大学土木工程学院,421001;[顾炜莉] 南华大学
关键词:
工程热力学与传热学;线上教学;工科专业;“二二三”在线教学模式
摘要:
针对工科类专业基础课受众广、理论性强的特点,以"工程热力学与传热学"为例,针对在线课程教学设计、教学准备和教学实施三个阶段制定"二二三"在线教学模式并加以实施.实施结果表明,学生通过线上学习,对课程内容掌握程度较好.
语种:
中文
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纳入动态数据的改进FLUS模型在城市增长边界划定中的应用
作者:
王志远;张考;丁志鹏;伍随意;黄春华
期刊:
地球信息科学学报 ,2020年22(12):2326-2337 ISSN:1560-8999
作者机构:
中南大学建筑与艺术学院,长沙410083;南华大学建筑学院,衡阳421001;湖南省健康城市营造工程技术研究中心,衡阳421001;南华大学土木工程学院,衡阳421001;[王志远] 中南大学
关键词:
城市增长边界;改进FLUS模型;动态数据;精度验证;土地利用变化;情景模拟;用地适宜性评价;长沙中心城区
摘要:
城市增长边界是管控城市建设用地无序扩张的有效手段,科学合理划定城市增长边界是当前研究关注的重要课题。本研究试图引入百度动态交通时间和POI数据改进FLUS模型,以长沙市中心城区为例,采用2000、2010和2018年3期土地利用数据对比验证改进FLUS模型模拟精度,并利用改进FLUS模型设置2种情景,模拟2030年长沙市中心城区土地利用变化,结合用地适宜性评价划定城市增长边界。结果显示:①纳入动态数据的改进FLUS模型模拟2010年和2018年土地利用相比原模型KAPPA系数提高了2.90%和2.74%,总体精度提高了1.79%和1.83%,表明改进模型具有更高模拟精度;②利用改进FLUS模型模拟的2030年长沙市中心城区土地利用变化,基准情景和生态保护情景建设用地规模分别为930.06 km^2和881.36 km^2,均以耕地转为建设用地比例最大;③长沙市中心城区刚性增长边界范围为1479.59 km^2,占中心城区总面积的37.38%,边界内包含了芙蓉区、天心区、雨花区、岳麓区和开福区的大部分区域;④基准情景和生态保护情景下,长沙市中心城区弹性增长边界面积分别为799.35 km^2和742.92 km^2,建设用地扩张空间主要为长沙县和望城区,结果与2010版长沙市城市总体规划拓展方向一致。纳入动态数据的改进FLUS模型多情景模拟划定城市增长边界,能更高精度的为规划决策提供科学依据。
语种:
中文
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Bio-oxidation of a high-sulfur refractory gold concentrate with a two-stage chemical-biological approach
作者:
Wang, Guohua;Liu, Xinxing;Wu, Yonghong;Zeng, Taotao;Li, Shiyou;...
期刊:
Hydrometallurgy ,2020年197:105421 ISSN:0304-386X
通讯作者:
Xie, Shuibo
作者机构:
[Xie, Shuibo; Liu, Yingjiu; Liu, Jinxiang; Zeng, Taotao; Li, Shiyou; Wang, Guohua] Univ South China, Hunan Prov Key Lab Pollut Control & Resources Reu, Hengyang 421001, Peoples R China.;[Liu, Xinxing; Wu, Yonghong] Cent South Univ, Sch Minerals Proc & Bioengn, Changsha 410083, Peoples R China.;[Liu, Xinxing; Wu, Yonghong] Cent South Univ, Key Lab Biohydromet, Minist Educ, Changsha 410083, Peoples R China.;[Xie, Shuibo] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Peoples R China.
通讯机构:
[Xie, Shuibo] U;Univ South China, Hunan Prov Key Lab Pollut Control & Resources Reu, Hengyang 421001, Peoples R China.
关键词:
Two-stage approach;Bio-oxidation;Pyrite;Refractory gold concentrate
摘要:
A two-stage chemical-biological oxidation approach, which applied a high temperature chemical oxidation stage prior to the bio-oxidation stage, was employed to accelerate the bio-oxidation rate of Axi gold concentrate with pyrite as the main sulfide phase. The extraction levels of Fe and S were 67.0% and 72.9% in the traditional one-stage bio-oxidation approach, while the values were elevated respectively to 78.0% and 79.6% with the two-stage approach. Accordingly, the extraction rate of gold was increased from 83.6% to 90.3% when subjected to the two-stage approach. The intensification mechanism of the two-stage approach was carried out by using Scanning Electron Microscope-Energy Dispersive X-ray Spectroscopy (SEM- EDX), X-ray photoelectron spectroscopy (XPS) and particle size analysis. The results indicated that pyrite on the surface of the concentrate was partly oxidized and particle size of the concentrate diminished after the first stage (chemical oxidation), which would facilitate the subsequent bio-oxidation process. © 2020 Elsevier B.V.
语种:
英文
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Properties and characterization of a metakaolin phosphate acid-based geopolymer synthesized in a humid environment
作者:
Dong, Teng;Xie, Shuibo* ;Wang, Jingsong;Chen, Zhenfu;Liu, Qing
期刊:
Journal of the Australian Ceramic Society ,2020年56(1):175-184 ISSN:2510-1560
通讯作者:
Xie, Shuibo
作者机构:
[Dong, Teng; Wang, Jingsong; Xie, Shuibo; Chen, Zhenfu; Liu, Qing] Univ South China, Sch Civil Engn, Hengyang 421001, Hunan, Peoples R China.;[Dong, Teng; Xie, Shuibo] Univ South China, Sch Resource Environm & Safety Engn, Hengyang 421001, Hunan, Peoples R China.
通讯机构:
[Xie, Shuibo] U;Univ South China, Sch Civil Engn, Hengyang 421001, Hunan, Peoples R China.;Univ South China, Sch Resource Environm & Safety Engn, Hengyang 421001, Hunan, Peoples R China.
关键词:
Geopolymer;Metakaolin;Phosphoric acid;Humid environment
摘要:
To synthesize a metakaolin phosphate acid-based geopolymer (PAG), calcined kaolin and phosphoric acid solutions with phosphorus-to-aluminium molar ratios (P/Al) of 0.6 to 1.0 were prepared. Fresh PAG was cured in a high-humidity environment at 50 °C for 7 days. High humidity is helpful for generating AlPO4 during the geopolymerization of PAG. Si and Al are depolymerized from metakaolin upon attack of H3PO4, and the amounts of leached Si and Al are directly proportional to P/Al. Leached Al increases with time, while leached Si decreases and then becomes stable. Pyrophosphate and hexa-coordinate Al could be components of the basic structural unit of PAG. Porosity and cracking increased with increasing P/Al and reduced the strength of PAG. The degree of shrinkage and the pore size are directly proportional to P/Al. The concentrated pores in PAG are gel pores, transitional pores and capillary pores corresponding to different P/Al ratios. © 2019, Australian Ceramic Society.
语种:
英文
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改性微生物吸附剂在重金属废水处理中的应用进展
作者:
刘金香;葛玉杰;谢水波;俞坤
期刊:
微生物学通报 ,2020年47(3):941-951 ISSN:0253-2654
作者机构:
南华大学污染控制与资源化技术湖南省重点实验室 湖南衡阳421001;南华大学土木工程学院 湖南衡阳421001;[葛玉杰; 刘金香; 俞坤; 谢水波] 南华大学
关键词:
改性微生物;重金属;废水处理
摘要:
高效、低耗、环境友好的重金属废水处理方法是当前的研究热点之一,微生物吸附法因具有优良的吸附性能、不产生二次污染、环境友好性等优点,在重金属废水处理中有巨大的应用潜力。细菌、真菌、藻类等微生物可通过静电吸附、络合作用等将重金属结合到细胞壁表面。但未经处理的微生物往往吸附效果不佳,通过对微生物进行物理、化学等方法的改性处理,能显著增加微生物与重金属离子结合的活性位点,提高去除效果。本文对国内外微生物的改性方法以及改性微生物吸附剂对废水中重金属的吸附能力和影响因素进行阐述,讨论微生物吸附剂存在的相关问题,并对其未来的研究方向做简要展望。
语种:
中文
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基于雨课堂的液压与气压传动课程教学模式与考核方法初探
作者:
盛湘飞;李智;戴权;罗彪
期刊:
教育现代化 ,2020年7(97):1-4 ISSN:1729-1267
作者机构:
[戴权; 罗彪; 李智; 盛湘飞] 南华大学 机械工程学院,湖南 衡阳;南华大学 土木工程学院,湖南 衡阳;南华大学 创新创业学院,湖南 衡阳
关键词:
雨课堂;液压传动;气压传动;教学模式;考核方法
摘要:
摘要:液压与气压传动是一门工程实践性较强的学科基础课,传统的课程教学模式与考核方法已无法满足新时代高校课程教学改革的需要。雨课堂作为一种新的智慧教学平台,给当代高校教师提供了一种创新课程教学模式和考核方法的思路,通过合理安排教学环节、精心设计教学内容、创新教学模式和考核评价方法,有利于激发学生的学习热情,提高学生学习的主动性与积极性,可规避传统课程考核方法中重考试成绩对课程教学改革带来的不利影响。在新学期通过对新的课程教学模式和考核方法的实施,发现教学过程中学生的到课率和抬头率均有明显提升,课程教学效果有明显改善。
语种:
中文
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