检索结果-南通市图书馆

Mineralogical characteristics and photocatalytic properties of natural sphalerite from China

Journal of Environmental Sciences 2020年第3期32卷 156-166页

作者： Can Shen Xiangping Gu Bin Yang Dexian Zhang Zhilin Wang Zhengxiang Shu Jeffrey Dick Anhuai Lu Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring Ministry of Education Central South UniversityChangsha 410083China School of Geoscience and Info-physics Central South UniversityChangsha 410083China

Different natural sphalerites have a range of photocatalytic properties that can potentially be exploited for environmental remediation purposes.To develop value in the exploitation of sphalerite,samples were collected from 19 ore deposits in China and characterized for their mineralogical and photocatalytic properties.X-ray diffraction(XRD) and electron probe micro analysis(EPMA) measurements indicated that all the natural sphalerites from various localities crystallized in cubic phases with various chemical compositions.The substitution of Fe for Zn ranged from 0.235% to 14.826% by weight,Mn from 0.004% to4.868%,Cu from 0.009% to 5.529% and Cd from 0.133% to 1.576%.As Fe became more abundant,the color of natural sphalerite darkened,becoming almost black;and higher Fe content was associated with stronger visible light absorption.Photoluminescence spectra showed emission mainly related to S-vacancies and progressively decreasing fluorescence intensity with increasing Fe content.Tests of the photocatalytic degradation of methyl orange indicated that the sample with the highest Cd content but moderate Fe content had the highest photocatalytic activity.Specifically,the degradation of Methyl Orange(30 mg/L)attained 82.11% efficiency under visible light irradiation for 4 hr of natural sphalerite with4.262% Fe and 1.576% Cd.Overall,the Fe content in sphalerite was found to contribute to the visible light absorption ability and the recombination rate of photo-generated electrons and holes,while substitution by Cd was observed to have a greater effect on the photocatalytic properties.These findings provide a scientific basis for the profitable utilization of base metal resources like sphalerite.

关键词： Natural sphalerite Mineralogical properties Band gap Photodegradation of Methyl Orange

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Inactivation efficiency of slightly acidic electrolyzed water against microbes on facility surfaces in a disinfection channel

引用

International Journal of Agricultural and Biological Engineering 2017年第6期10卷 23-30页

作者： Zang Yitian Li Baoming Shi zhengxiang Sheng Xiaowei Wu Hongxiang shu Dengqun College of Animal Science and Technology Jiangxi Agricultural UniversityNanchang 330045China Key Laboratory of Structure and Environment in Agricultural Engineering Ministry of AgricultureChina Agricultural UniversityBeijing 100083China

Slightly acidic electrolyzed water(SAEW,pH 6.0-6.5)is an ideal and environmentally-friendly disinfectant,which was used to prevent and control bacterial infections on farms.This work aims to investigate the inactivation effectiveness of SAEW in inactivating microbes in a disinfection channel.The bactericidal efficiency of SAEW on equipment surfaces was compared to two commercial disinfectants,Kuei A bromide solution(KAS,5:1000 v/v)and Glutaraldehyde solution(GS,5:1000 v/v).The disinfection effectiveness of SAEW in inactivating Salmonella enteritidis(S.enteritidis)on equipment surfaces in the disinfection channel was evaluated,and a model was developed using multiple linear regression analysis.Results indicated that SAEW was significantly(p0.05).In addition,available chlorine concentration(ACC)was an important factor than other factors,and the inactivation efficiency of Salmonella enteritidis sprayed by SAEW treatment was different between iron materials,kits and clothing surfaces(iron>kit>clothing).

关键词： slightly acidic electrolyzed water disinfection channel S.enteritidis disinfection bacterial infection prevention and control livestock farm

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Pushing the activity of CO2 electroreduction by system engineering

引用

Science Bulletin 2019年第24期64卷 1805-1816页

作者： Hao Shen zhengxiang Gu Gengfeng Zheng Laboratory of Advanced Materials Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Fudan University

As a promising technology that may solve global environmental challenges and enable intermittent renewable energy storage as well as zero-carbon-emission energy cycling, the carbon dioxide reduction reaction has been extensively studied in the past several years. Beyond the fruitful progresses and innovations in catalysts, the system engineering-based research on the full carbon dioxide reduction reaction is urgently needed toward the industrial application. In this review, we summarize and discuss recent works on the innovations in the reactor architectures and optimizations based on system engineering in carbon dioxide reduction reaction. Some challenges and future trends in this field are further discussed, especially on the system engineering factors.

关键词： CO2 reduction Electrocatalysis Flow-cell electrolyzer Catalytic reactor engineering Artificial photosynthesis

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Atacamite and Nantokite in Kaerqueka Copper Deposit of Qimantag Area:Evidence for Cenozoic Climate Evolution of the Qaidam Basin

引用

Journal of Earth Science 2017年第3期28卷 492-499页

作者： Liwen Yi Xiangping Gu Anhuai Lu Xiangyu Li Dexian Zhang Zhiling Wang Jianping Liu shuai Li Zhengxiang Shu Cui Yu Hongyan Zuo Can Shen College of Resources and Environmental Sciences Hunan Normal UniversityChangsha 410081China Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitor Ministry of EducationChangsha 410083China School of Geosciences and Info-Physics Central South UniversityChangsha 410083China Hunan Institute of Geological Survey Changsha 410116China

Using a mineralogy method to reflect climate evolution is a new approach to research Cenozoic environmental progression of the Qaidam Basin. In this paper, we present the chemical composition and crystallographic parameter of atacamite, nantokite, and tenorite in cryptocrystalline aggregates from the Kaerqueka copper deposit of Qimantag metallogenic belt by means of electron microprobe and in-situ X-ray diffraction analyses. Atacamite and nantokite occur in an intimate intergrowth as the secondary precipitation of chalcopyrite and bornite filling in the interstitial space of andradite in the Kaerqueka copper deposit, with an average composition of Cl： 12.38 wt.%, Cu： 63.76 wt.%, O： 21.46 wt.%. X-ray microdiffraction shows that the intergrowth contains nantokite with a cubic unit cell a=5.403（2）？ and atacamite with an orthorhombic unit cell a=6.030（3）, b=6.883（2）, c=9.114（1）？. XRD quantitative calculation shows that the nanometric aggregate contains 36.07 wt.% tenorite, 18.41 wt.% atacamite, and 45.52 wt.% nantokite. The presence of nantokite and atacamite requires saline solutions for their formation and hyper-arid climate conditions for their preservation. Combined with the data of salt lakes and the pollen sequence of western China, we suggest that during the uplift of the Tibetan Plateau and the retreat of the Paratethys, saline water was forced to the surface through a basal fracture zone. In the hyper-arid climate of the Qaidam Basin, the recharge of groundwater by direct precipitation is negligible, and groundwater is derived from inflow from the salt lakes. Thus, atacamite is preserved. In addition, spertiniite in the edge and fractures of atacamite and nantokite may represent wetter climate after the formation of atacamite and nantokite.

关键词： atacamite nantokite climate evolution Qaidam Basin

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

水城煤田瓦斯赋存的构造逐级控制

引用

中国矿业 2018年第B6期27卷 307-310,315页

作者：黄政祥公衍伟马署贵州省煤矿设计研究院贵州贵阳550025 贵州大学贵州贵阳550025

为认识水城煤田的瓦斯赋存特征,采用构造对瓦斯的逐级控制理论,分析了构造演化、现今构造组合样式及煤层的非均质性等对煤中瓦斯生成、运移和保存的控制。研究表明:研究区具有稳定的三角洲间湾成煤环境,为甲烷的生成提供了较好的物质基... 详细信息

为认识水城煤田的瓦斯赋存特征,采用构造对瓦斯的逐级控制理论,分析了构造演化、现今构造组合样式及煤层的非均质性等对煤中瓦斯生成、运移和保存的控制。研究表明:研究区具有稳定的三角洲间湾成煤环境,为甲烷的生成提供了较好的物质基础。煤层沉积后经历了三期次的生烃作用,生成大量瓦斯。盆地隔挡式褶皱发育,对瓦斯赋存的控制作用可分为3种类型:宽缓简单向斜+良好封盖层,不对称向斜+良好封盖层,不对称陡立向斜+良好封盖层。埋藏较深的向斜核部煤变质程度较高,瓦斯含量一般较大。变形较大的构造部位煤体结构变形较严重,使得煤体具有更好的微观孔隙结构。

关键词：水城煤田瓦斯赋存构造逐级控制构造样式非均质性

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

我国褐硫砷铅矿的发现及矿物学特征

引用

矿产与地质 2017年第2期31卷 394-399页

作者：李帅束正祥谷湘平中南大学地球科学与信息物理学院湖南长沙410083

运用微区原位X射线衍射及电子探针显微分析等技术在国内首次研究了盘龙铅锌矿床内褐硫砷铅矿。研究表明,褐硫砷铅矿以不规则粒状集合体与重晶石、白云石、闪锌矿、黄铁矿伴生,粒度从几微米到300微米左右,电子探针数据显示该区褐硫砷铅... 详细信息

运用微区原位X射线衍射及电子探针显微分析等技术在国内首次研究了盘龙铅锌矿床内褐硫砷铅矿。研究表明,褐硫砷铅矿以不规则粒状集合体与重晶石、白云石、闪锌矿、黄铁矿伴生,粒度从几微米到300微米左右,电子探针数据显示该区褐硫砷铅矿的经验式为Pb3.12(As2.81Sb1.13)∑3.95S8.94,与理想式Pb3(As,Sb)4S9一致。微区X射线衍射表明该矿物为三斜晶系,晶胞参数为:a=22.86,b=7.95,c=7.95,α=90.28°,β=96.96°,γ=90.42°,Z=4.该矿物的特点是含较高的Sb,不含Ag,As、Sb呈显著负相关,存在Sb替换As现象,区内褐硫砷铅矿与多种其他硫盐类矿物同时出现,共同指示着低氧逸度、适当硫活度的成矿环境,且硫盐矿物富集处也为矿床富矿段。

关键词：褐硫砷铅矿微区X射线衍射电子探针显微分析硫盐类矿物盘龙铅锌矿

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

直接测风激光雷达外场实验稳频方法

引用

红外与激光工程 2016年第9期45卷 114-121页

作者：王国成张飞飞钱正祥杜跃舒志峰孙东松中国人民解放军陆军军官学院六系安徽合肥230031 中国科学技术大学地球和空间科学学院安徽合肥230031

基于Fabry-Perot标准具的直接探测测风激光雷达是中高层大气风场探测的有效手段之一,系统保持长期稳定地运行是监测风场变化的基本需求;通过对DWL给出的无效探测数据进行的深入剖析,得出是激光发射频率发生了相对漂移所致;然后,搭建实... 详细信息

基于Fabry-Perot标准具的直接探测测风激光雷达是中高层大气风场探测的有效手段之一,系统保持长期稳定地运行是监测风场变化的基本需求;通过对DWL给出的无效探测数据进行的深入剖析,得出是激光发射频率发生了相对漂移所致;然后,搭建实验验证内在机理,得出,Nd:YAG激光器中种子激光器工作环境温度每变化1℃将导致激光发射频率产生1.536 GHz漂移,可致使透过率变化最大达46.1%,标准具工作环境温度每变化1℃相当于激光频率产生的相对漂移量737.7 MHz;当满足小于1 m/s的系统误差时,需要建立三级温控机制,将系统整体处于调控精度为1℃的恒温环境中工作,另外将种子激光器、标准具分别置于调控精度为0.001℃的恒温箱内工作,能够满足风场探测的要求。

关键词：多普勒测风激光雷达 FP标准具瑞利散射频率

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Clinical Study on Chronopharmacokinetics of Digoxin in Patients with Congestive Heart Failure

引用

Journal of Huazhong University of Science and Technology(Medical Sciences) 1998年第1期18卷 21-24页

作者：刘正湘方淑贤王琳朱同新杨汉荣余枢 Department of Cardiology Tongji Hospital Tongji Medical University Wuhan Department of Pharmacy Tongji Hospital Tongji Medical University Wuhan

Fluorescence polarization immunoassay was used to study the chronopharmacokirietics of digoxin in 10 patients with congestive heart failure (CHF) who also served as self-controls. Our results showed that the serum digoxin concentration reached peak value 1h after taking digoxin at 7: 00 a. m.,but the serum digoxin concentration reached the peak value 2 h after taking digoxin at 4: 00 p. m.. The average serum digoxin concentration area under curve was greater and the best maintainable time of serum concentration within 24 h after taking digoxin at 4 p. m. longer than those at 7: 00 a. m.. The heart rates were obviously lower and the cardiac function was significantly improved in 4:00 p. m.group.

关键词： digoxin congestive heart failure chronopharmacokinetics

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

景区边缘型乡村旅游地生态脆弱性评价研究——以大南岳旅游圈为例

引用

衡阳师范学院学报 2018年第6期39卷 1-6页

作者：李伯华谭淑婷窦银娣黄洁湖南省人居环境学研究基地湖南衡阳421002 衡阳师范学院城市与旅游学院湖南衡阳421002

以大南岳旅游圈为例,从暴露性、敏感性和适应能力3个维度选取了15个指标,构建了生态脆弱性评价体系。研究结果表明:(1)大南岳旅游圈生态脆弱性由小到大依次为南岳区、蒸湘区、石鼓区、衡阳县、衡东县、雁峰区、衡山县和珠晖区;(2)各指... 详细信息

以大南岳旅游圈为例,从暴露性、敏感性和适应能力3个维度选取了15个指标,构建了生态脆弱性评价体系。研究结果表明:(1)大南岳旅游圈生态脆弱性由小到大依次为南岳区、蒸湘区、石鼓区、衡阳县、衡东县、雁峰区、衡山县和珠晖区;(2)各指标与研究区生态脆弱性关联度由大到小依次为多年平均降水量、居民人均教育水平、土壤可侵蚀K值、生态环保投入、7-9月干旱指数、人口密度;(3)各研究单元的主要贡献因子不尽相同,相对应的贡献率也有所差异。

关键词：大南岳旅游圈生态脆弱性 VSD模型灰色关联度

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

The enhanced X-ray Timing and Polarimetry mission—eXTP

引用

Science China(Physics,Mechanics & Astronomy) 2019年第2期62卷 3-27页

作者： shuangNan Zhang Andrea Santangelo Marco Feroci YuPeng Xu FangJun Lu Yong Chen Hua Feng shu Zhang Sφren Brandt Margarita Hernanz Luca Baldini Enrico Bozzo Riccardo Campana Alessandra De Rosa YongWei Dong Yuri Evangelista Vladimir Karas Norbert Meidinger Aline Meuris Kirpal Nandra Teng Pan Giovanni Pareschi Piotr Orleanski QiuShi Huang Stephane Schanne Giorgia Sironi Daniele Spiga Jiri Svoboda Gianpiero Tagliaferri Christoph Tenzer Andrea Vacchi Silvia Zane Dave Walton ZhanShan Wang Berend Winter Xin Wu Jean J.M.in't Zand Mahdi Ahangarianabhari Giovanni Ambrosi Filippo Ambrosino Marco Barbera Stefano Basso Jörg Bayer Ronaldo Bellazzini Pierluigi Bellutti Bruna Bertucci Giuseppe Bertuccio Giacomo Borghi XueLei Cao Franck Cadoux Francesco Ceraudo TianXiang Chen Yu Peng Chen Jerome Chevenez Marta Civitani Wei Cui WeiWei Cui Thomas Dauser Ettore Del Monte Sergio Di Cosimo Sebastian Diebold Victor Doroshenko Michal Dovciak YuanYuan Du Lorenzo Ducci QingMei Fan Yannick Favre Fabio Fuschino JoséLuis Ga'lvez Min Gao MingYu Ge Olivier Gevin Marco Grassi QuanYing Gu YuDong Gu DaWei Han Bin Hong Wei Hu Long Ji shuMei Jia WeiChun Jiang Thomas Kennedy Ingo Kreykenbohm Irfan Kuvvetli Claudio Labanti Luca Latronico Gang Li Maoshun Li Xian Li Wei Li ZhengWei Li Olivier Limousin HongWei Liu XiaoJing Liu Bo Lu Tao Luo Daniele Macera Piero Malcovati Adrian Martindale Malgorzata Michalska Bin Meng Massimo Minuti Alfredo Morbidini Fabio Muleri Stephane Paltani Emanuele Perinati Antonino Picciotto Claudio Piemonte JinLu Qu Alexandre Rachevski Irina Rashevskaya Jerome Rodriguez Thomas Schanz zhengxiang Shen LiZhi Sheng JiangBo Song LiMing Song Carmelo Sgro Liang Sun Ying Tan Phil Uttley Bo Wang DianLong Wang GuoFeng Wang Juan Wang LangPing Wang YuSa Wang Anna L.Watts XiangYang Wen Jörn Wilms ShaoLin Xiong JiaWei Yang Sheng Yang YanJi Yang Nian Yu WenDa Zhang Gianluigi Zampa Nicola Zampa Andrzej A.Zdziarski AiMei Zhang ChengMo Zhang Fan Zhang Long Zhang Tong Zhang Yi Zhang XiaoLi Zhang ZiLiang Zhang BaoSheng Zhao ShiJie Zheng Yu Peng Zhou Key Laboratory for Particle Astrophysics Institute of High Energy PhysicsChinese Academy of Sciences Institut für Astronomie und Astrophysik Eberhard Karls Universität INAF-Istituto di Astrofisica e Planetologia Spaziali INFN-Roma Tor Vergata Via della Ricerca Scientifica 1 Department of Engineering Physics and Center for Astrophysics Tsinghua University DTU Building 327DK-2800 Kongens Institute of Space Sciences 08193 Cerdanyola del Valles Institut d’Estudis Espacials de Catalunya Sezione di Pisa Istituto Nazionale di Fisica NucleareLargo Bruno Pontecorvo3 Department of Astronomy University of Genevachemin d’Ecogia 16 Osservatorio di Astrofisica e Scienza Dello Spazio di Bologna Istituto Nazionale di Astofisica Astronomical Institute Czech Academy of Sciences Max Planck Institute for Extraterrestrial Physics Giessenbachstr.1 CEA Paris-Saclay/IRFU Beijing Institute of Spacecraft System Engineering CAST Osservatorio Astronomico di Brera Istituto Nazionale di Astofisica Space Research Center Polish Academy of Sciences Key Laboratory of Advanced Material Microstructure of Education Ministry of China Institute of Precision Optical EngineeringSchool of Physics Science and EngineeringTongji University Department of Physics and Center for Astrophysics Tsinghua University Universita’degli Studi di Udine Via delle Scienze 206 Mullard Space Science Laboratory University College London Department of Nuclear and Particle Physics University of Geneva SRON Netherlands Institute for Space Research Politecnico di Milano Sezione di Perugia Istituto Nazionale di Fisica Nucleare Dipartimento di Fisica e Chimica Fondazione Bruno Kessler Dr.Karl Remeis-Observatory and Erlangen Centre for Astroparticle Physics Universität Erlangen-Nürnberg University of Pavia Department of ElectronicsInformation and Biomedical Engineering and INFN Pavia Sezione di Torino Istituto Nazionale di Fisica NucleareVia Pietro Giuria1 Department of Physics and Astronomy University of Leicester Sezione di Trieste Istituto Nazionale di Fisica Nucleare

In this paper we present the enhanced X-ray Timing and Polarimetry mission—eXTP. eXTP is a space science mission designed to study fundamental physics under extreme conditions of density, gravity and magnetism. The mission aims at determining the equation of state of matter at supra-nuclear density, measuring effects of QED, and understanding the dynamics of matter in strong-field gravity. In addition to investigating fundamental physics, eXTP will be a very powerful observatory for astrophysics that will provide observations of unprecedented quality on a variety of galactic and extragalactic objects. In particular, its wide field monitoring capabilities will be highly instrumental to detect the electro-magnetic counterparts of gravitational wave sources.The paper provides a detailed description of:(1) the technological and technical aspects, and the expected performance of the instruments of the scientific payload;(2) the elements and functions of the mission, from the spacecraft to the ground segment.

关键词： X-ray instrumentation X-ray polarimetry X-ray timing space mission:eXTP

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：