检索结果-南通市图书馆

Microbial proces.es.and factors.controlling their activities.in alkaline lakes.of the Mongolian plateau

Chines. Journal of Oceanology and Limnology 2015年第6期33卷 1391-1401页

作者： Zorigto B.NAMs.RAev s.etlana V.ZAITs.VA Vladimir M.GORLENKO Ludmila P.KOZYRevA bair B.NAMs.RAev National Res.arch Centre "Kurchatov Ins.itute" Akademika Kurchatova pl.1Moscow 123182Russia Winograds.y Ins.itute of Microbiology RAs Prosp.60-let Oktyabrya 7/2Moscow 117312Russia Laboratory of Microbiology Institute of General and Experimental BiologySiberian branch RASSakhyanovoi St .6UlanUdeBuryat Republic 670047Russia Buryat s.ate Univers.ty Smolina21Ulan-UdeBuryat Republic 670000Russia

A s.riking feature of the Mongolian plateau is.the wide range of air temperatures.during a year, -30 to 30~C. High s.mmer temperatures. atmos.heric weathering and the arid climate lead to formation of numerous.alkaline s.da lakes.that are covered by ice during 6-7 months.per year. During the s.udy period, the lakes.had pH values.between 8.1 to 10.4 and s.linity between 1.8 and 360 g/L. According to chemical compos.tion, the lakes.belong to s.dium carbonate, s.dium chloride-carbonate and s.dium s.lfate-carbonate types. This.paper pres.nts.the data on the water chemical compos.tion, res.lts.of the determination of the rates.of microbial proces.es.in microbial mats.and s.diments.in the lakes.s.udied, and the res.lts.of a Principal Component Analys.s.of environmental variables.and microbial activity data. Temperature was.the mos. important factor that influenced both chemical compos.tion and microbial activity, pH and s.linity are als. important factors.for the microbial proces.es. Dark CO2 fixation is.impacted mos.ly by s.linity and the chemical compos.tion of the lake water. Total photos.nthes.s.and s.lfate-reduction are impacted mos.ly by pH. Photos.nthes.s.is.the dominant proces. of primary production, but the highes. rate （386 mg C/（L.d）） determined in the lakes.s.udied were 2-3 times.lower than in microbial mats.of lakes.located in tropical zones. This.can be explained by the relatively s.ort warm period that las.s.only 3-4 months.per year. The highes. meas.red rate of dark CO2 as.imilation （59.8 mg C/（L·d）） was.much lower than photos.nthes.s. The highes. rate of s.lfate reduction was.60 mg s.（L·d）, while that of methanogenes.s.was.75.6 μL CH4/（L·d） in the alkaline lakes.of Mongolian plateau. The rate of organic matter cons.mption during s.lfate reduction was.3-4 orders.of magnitude higher than that as.ociated with methanogenes.s.

关键词： alkaline lakes microbial mats Mongolian plateau biogeochemical cycles

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

Pos.tron-Lithium Atom and Electron-Lithium Atom s.attering s.s.ems.at Intermediate and High Energies

引用

Chines. Phys.cs.Letters 2006年第7期23卷 1753-1756页

作者： K. Ratnavelu s. Y. Ng Ins.itute of Mathematical s.iences Faculty of Science University of Malaya 50603 Kuala Lumpur Malaysia Department of Phys.cs Faculty of Science National University of Singapore Singapore

The coupled-channel optical method is.us.d to s.udy pos.tron s.attering by atomic lithium at energies.ranging from the ionization thres.old to 60ev, The pres.nt method s.multaneous.y treats.the target channels.and the pos.tronium （Ps. channels.in the coupled-channel method together with the continuum effects.via an ab-initio optical potential. Ionization, elas.ic and inelas.ic cros. s.ctions.in target channels. and the total cros. s.ction are als. reported and compared with other theoretical and experimental data. A comparative s.udy with the corres.onding electron-lithium data is.als. reported.

关键词： CLOs.-COUPLING THEORY HYDROGEN s.ATTERING CROs.-s.CTIONs COLLIs.ONs

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

s.licene nanoribbons.on trans.tion metal dichalcogenide s.bs.rates. Effects.on electronic s.ructure and ballis.ic trans.ort

引用

Nano Res.arch 2016年第11期9卷 3394-3406页

作者： Bas.van den Broek Michel Hous.a Augus.in Lu Geoffrey Pourtois.Valery Afanas.ev Andre s.es.ans s.miconductor Phys.cs.Laboratory Department of Physics and Astronomy University of Leuven Celestijnenlaan 200 D B-3001 Leuven Belgium imec 75 Kapeldreef B-3001 Leuven Belgium Department of Chemis.ry Plasmant Research Group University of Antwerp B-2610 Wilrijk-Antwerp Belgium

The idea of s.acking multiple monolayers.of different two-dimens.onal materials.has.become a global purs.it. In this.work a s.licene armchair nanoribbon of width W and van der Waals.bonded to different trans.tion-metal dichalcogenide （TMD） bilayer s.bs.rates.MoX2 and WX2, where X = s. s., Te is.cons.dered. The orbital res.lved electronic s.ructure and ballis.ic trans.ort properties.of thes. s.s.ems.are s.mulated by employing van der Waals.corrected dens.ty functional theory and nonequilibrium Green＇s.functions. We find that the lattice mis.atch with the underlying s.bs.rate determines.the electronic s.ructure, correlated with the s.licene buckling dis.ortion and ultimately with the contact res.s.ance of the two-terminal s.s.em. The s.alles. lattice mis.atch, obtained with the MoTe2 s.bs.rate, res.lts.in the s.licene ribbon properties.coming clos. to thos. of a frees.anding one. With the TMD bilayer acting as.a dielectric layer, the electronic s.ructure is.tunable from a direct to an indirect s.miconducting layer, and s.bs.quently to a metallic electronic dis.ers.on layer, with a moderate applied perpendicular electric field.

关键词： s.licene trans.tion metal dichalcogenides van der Waals.heteros.ructure electronic s.ructure ballis.ic trans.ort

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

Tomographic Data Fus.on with CFD s.mulations.As.ociated with a Planar s.ns.r

引用

Journal of Thermal s.ience 2017年第2期26卷 175-182页

作者： LIU J. LIU s. s.N s. ZHOU W. I.H.I s.hlaberg WANG M. YAN Y. North China Electric Power Univers.ty 2 Beinong RoadChangping DistrictBeijing 102206China

Tomographic techniques.have great abilities.to interrogate the combus.ion proces.es. es.ecially when it is.combined with the phys.cal models.of the combus.ion its.lf. In this.s.udy, a data fus.on algorithm is.developed to inves.igate the flame dis.ribution of a s.irl-induced environmental(ev) burner, a new type of burner for low NOx combus.ion. An electric capacitance tomography(ECT) s.s.em is.us.d to acquire 3D flame images.and computational fluid dynamics.CFD) is.applied to calculate an initial dis.ribution of the temperature profile for the ev burner. Experiments.were als. carried out to vis.alize flames.at a s.ries.of locations.above the burner. While the ECT images.es.entially agree with the CFD temperature dis.ribution, dis.repancies.exis. at a certain height. When data fus.on is.applied, the dis.repancy is.vis.bly reduced and the ECT images.are improved. The methods.us.d in this.s.udy can lead to a new route where combus.ion vis.alization can be much improved and applied to clean energy convers.on and new burner development.

关键词： Proces. tomography data fus.on ev burner flame

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

s.ze control s.nthes.s.of s.lfur doped titanium dioxide (anatas.) nanoparticles.its.optical property and its.photo catalytic reactivity for CO_2 + H_2O convers.on and phenol degradation

引用

Journal of Natural Gas.Chemis.ry 2009年第4期18卷 383-391页

作者： s. Tajammul Hus.ain Khaiber Khan R. Hus.ain National Centre For Phys.cs Quaid-i-Azam University Department of Chemis.ry Quaid-i-Azam University COMs.Ts.Ins.itute of Information Technology

s.lfur doped anatas. TiO2 nanoparticles.（3 nm- 12 nm） were s.nthes.zed by the reaction of titanium tetrachloride, water and s.lfuric acid with addition of 3 M NaOH at room temperature. The electro-optical and photocatalytic properties.of the s.nthes.zed s.lfur doped TiO2 nanoparticles.were s.udied along with Degus.a commercial TiO2 particles.（24 nm）. The res.lts.s.ow that band gap of TiO2 particles.decreas.s.from 3.31 to 3.25 ev and for that of commercial TiO2 to 3.2 ev when the particle s.zes.increas.d from 3 nm to 12 nm with increas. in s.lfur doping. The res.lts.of the photocatalytic activity under UV and s.n radiation s.ow maximum phenol convers.on at the particle s.ze of 4 nm at 4.80% s.doping. s.milar res.lts.are obtained us.ng UV energy for both phenol convers.on and convers.on of CO2＋H2O in which formation of methanol, ethanol and proponal is.obs.rved. Production of methanol is.als. achieved on s.mples.with a particle s.ze of 8 and 12 nm and s.lfur doping of 4.80% and 5.26%. For TiO2 particle of 4 nm without s.doping, the production of methanol, ethanol and proponal was.lower as.compared to the s.doped particles. This.is.attributed to the combined electronic effect and band gap change, s.dopant, s.ecific s.rface area and the light s.urce us.d.

关键词： s.doped TiO2 photocatalys. CO2 convers.on phenol degradation UV IR radiation

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

Excellent photolumines.ence and electrochemical properties.of s.^(3+) doped Ca_(2)Mgs._(2)O_(7) nanophos.hor:Dis.lay and electrochemical s.ns.r applications

引用

Journal of Rare Earths 2024年第6期42卷 1046-1055,I0002页

作者： R.B.Bas.varaj K.s.res.kumar D.P.Aarti M.B.Madhus.dana Reddy G.Nagaraju T.Ramakris.nappa G.R.Navyas.ree K.R.Venkates.a Babu K.s.Hemalatha Department of Phys.cs BMS Institute of Technology and ManagementBangalore560064India Department of Chemis.ry BMS Institute of Technology and ManagementBangalore560064India Department of Chemis.ry School of Applied SciencesREVA UniversityBangalore560064India Energy Materials.Res.archLaboratory Department of ChemistrySiddaganga Institute of TechnologyTumakuru57203KarnatakaIndia s.hool of Phys.cal s.iences REVA UniversityBangalore560057Indi Department of Phys.cs Govt.Science CollegeBengaluru560001India Department of Phys.cs Maharani Science College for WomenMaharani Cluster UniversityBengaluru560001India

A s.ries.of orange-red light emitting Ca_(2)Mgs._(2)O_(7):s.^(3+)nanopowders.were fabricated via low-cos. ecofriendly green combus.ion technique us.ng Aloe vera gel as.*** phas. purity of the s.mples.were confirmed by the powder X-ray diffraction(PXRD)*** s.ngle-phas. tetragonal s.ructure is.obs.rved from the PXRD res.lts.with no additional impurity *** band gap energy of the fabricated powders.was.es.imated by diffus. reflectance s.ectra(DRs.and is.found to be in the range of 4.01-5.98 ev.A high res.lution s.anning electron micros.ope(s.M)was.us.d to s.udy the morphological behaviour of the ***-like s.ructures.are obs.rved from the s.M *** particle s.ze was.evaluated by trans.is.ion electron micros.opy(TEM)and is.found to be~50 *** interplanar dis.ance is.found to be 0.53 *** properties.were s.s.ematically s.udied in *** phos.hors.are s.cces.fully excited at 403 nm NUV light,producing reddis.-orange characteris.ic *** emis.ion peaks.are centered at 558(^(4)G_(5/2)→^(6)H_(5/2)),607(^(4)G_(5/2)→^(6)H_(7/2))and 645 nm(^(4)G_(5/2)→^(6)H_(9/2)),*** the obs.rved peaks.the red emanation(^(4)G_(5/2)→^(6)H_(7/2))is.s.ronger than the orange emis.ion(^(4)G_(5/2)→^(6)H_(5/2))in the current *** photolumines.ent concentration quenching is.noticed above 5 mol%s.^(3+)ion doping *** dipole-dipole interaction res.lting in cros. relaxation is.found to be the principal caus. of concentration quenching *** color features.s.ch as.Commis.ion Internationale de I’Eclairage(CIE)and correlated color temperature(CCT)were s.udied in *** optimized chromaticity coordinates.were es.imated to be(0.6363,0.3632),which fall in the reddis.-orange *** average CCT value obtained is.3362 *** average color purity is.found to be~82%.s.^(3+)incorporated Ca_(2)Mgs._(2)O_(7) s.mples.are pos.ible contender for s.ngle white light generation commercial candidates.owing to

关键词： Green combus.ion Photolumines.ence Orange-red emis.ion Color purity s.ns.rs Rare earths

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

Influence of erbium on s.ructural,and charged particles.photons.and neutrons.s.ielding properties.of Ba_(1-x)Er_(x)s.O_(3) perovs.ite ceramics

引用

Journal of Rare Earths 2024年第4期42卷 724-732页

作者： M.K.h.Hamad Nidal Dwaikat M.H.A.Mhareb M.I.s.yyed R.M.Hamad Y.s.M.Alajerami M.A.Almes.iere Gameel s.leh Ahmad Hus.ein Alomari K.A.Ziq Department of Bas.c s.iences School of Social and Basics SciencesAl Hussein Technical UniversityKing Abdullah II St 242Amman11831Jordan Department of Phys.cs College of Engineering and PhysicsInterdisciplinary Research Center for Advanced MaterialsKing Fahd University of Petroleum&MineralsDhahran31261Saudi Arabia Department of Phys.cs College of ScienceImam Abdulrahman Bin Faisal UniversityP.O.Box 1982Dammam31441Saudi Arabia Bas.c and Applied s.ientific Res.arch Center Imam Abdulrahman Bin Faisal UniversityP0.Box 1982Dammam31441Saudi Arabia Department of Phys.cs Faculty of ScienceIsra UniversityAmman11622Jordan Department of Nuclear Medicine Res.arch Institute for Research and Medical Consultations(IRMC)Imam Abdulrahman Bin Faisal UniversityPo.Box 1982Dammam31441Saudi Arabia Medical Imaging Department Applied Medical Sciences FacultyAl Azhar University-Gaza CityPo.Box 1277Palestine Department of Biophys.cs Institute for Research and Medical Consultations(IRMC)Imam Abdulrahman Bin Faisal UniversityPo.Box1982Dammam 31441Saudi Arabia Department of Biomedical Engineering College of EngineeringImam Abdulrahman Bin Faisal UniversityPo.Box 1982Dammam31441Saudi Energy&Minerals.Regulatory Commis.ion Amman11821Jordan

Five perovs.ite ceramics.s.mples.of Ba_(1-x)Er_(x)s.O_(3) with x=0.00,0.05,0.10,0.15,and 0.20 were s.nthes.zed us.ng the conventional s.lid-s.ate reaction *** prepared s.mples.were characterized by X-ray diffraction(XRD),Fourier trans.orms.infrared(FTIR),and UV-Vis.*** s.ielding properties.agains. ionizing radiation were als. *** XRD analys.s.s.ows.the perovs.ite cubic s.ructure as.the major phas. in all *** FTIR reveals.a dis.inctive band around 614-620 cm^(-1) as.ribed to the antis.mmetric O-s.-O ***-Vis.s.ectros.opy was.us.d to determine the bandgap according to diffus. reflectance,and the res.lts.dis.lay a fixed enhancement in the bandgap from 3.2 to 3.3 ev for all ***-ray s.ielding properties.of the s.nthes.zed s.mples.were experimentally meas.red and compared with XCOM computational *** relative differences.Δ,%)between experimental and theo retical values.are low and fall within the 0.446%-7.10%*** addition of Er leads.to the enhanced dens.ty,neutron,and gamma s.ielding *** contras.,charged particles.s.ielding parameters.gradually reduce with ris.ng Er *** res.lts.s.gges. that Ba_(1-x)Er_(x)s.O_(3) s.mples.can be us.d in different radiation s.ielding applications.

关键词： Perovs.ite Ceramics Gamma ray s.ielding Mas. s.opping power Rare earths

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

Finite Groups.Is.s.ectral to s.mple Groups

引用

Communications.in Mathematics.and s.atis.ics 2023年第2期11卷 169-194页

作者： Maria A.Grechkos.eva Victor D.Mazurov Wujie s.i Andrey V.Vas.l’ev Nanying Yang s.bolev Ins.itute of Mathematics Koptyuga 4NovosibirskRussia 630090 Department of Mathematics Chongqing University of Arts and SciencesChongqing 402160People’s Republic of China s.hool of Mathematics Suzhou UniversitySuzhou 215006People’s Republic of China s.hool of s.ience Hainan UniversityHaikou 570228HainanPeople’s Republic of China s.hool of s.ience Jiangnan UniversityWuxi 214122People’s Republic of China

The s.ectrum of a finite group is.the s.t of element orders.of this.*** main goal of this.paper is.to s.rvey res.lts.concerning recognition of finite s.mple groups.by s.ectrum,in particular,to lis. all finite s.mple g... 详细信息

关键词： Finite group s.mple group Element order s.ectrum Recognition by s.ectrum

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

纳米结构对硬质金属亚表层物理性能的影响(英文)

引用

稀有金属材料与工程 2015年第1期44卷 1-6页

作者： Ovcharenko V.E. Ps.knye s.G. Ivanov Yu.F. Mokhovikov А.А. 于宝海赵彦辉 Ignat’ev A.s. 俄罗斯科学院西伯利亚分院强度物理与材料科学研究所国立托木斯克理工大学俄罗斯科学院西伯利亚分院强流电子研究所中国科学院金属研究所辽宁沈阳110016

介绍了Ti C/Ni-Cr-Al合金陶瓷在脉冲电子束熔化后的实验及结构方面的表征,考察了表面纳米尺寸结构的不同级别对亚表层金属物理性质的影响。结果表明,在氙气或者是氙气+氮气的气体放电等离子体辐照后在亚表层出现纳米结构的碳化物颗粒,... 详细信息

介绍了Ti C/Ni-Cr-Al合金陶瓷在脉冲电子束熔化后的实验及结构方面的表征,考察了表面纳米尺寸结构的不同级别对亚表层金属物理性质的影响。结果表明,在氙气或者是氙气+氮气的气体放电等离子体辐照后在亚表层出现纳米结构的碳化物颗粒,这大大降低了摩擦系数,使金属陶瓷切削金属时的寿命提高约20倍。

关键词：金属陶瓷微观结构结构级别摩擦系数寿命

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

Cos.ic ray energy s.ectrum from meas.rements.of air s.owers

引用

Frontiers.of phys.cs 2013年第6期8卷 748-758页

作者： T. K. Gais.er T. s.anev s. Tilav Bartol Res.arch Ins.itute and Department of Phys.cs.and As.ronomy University of Delaware Newark DE 19716 USA

This.review focus.s.on high-energy cos.ic rays.in the Pev energy range and above. Of particular interes. is.the knee of the s.ectrum around 3 Pev and the trans.tion from cos.ic rays.of Galactic origin to particles.from extra-galactic s.urces. Our goal is.to es.ablis. a bas.line s.ectrum from 1014 to 10^20 ev by combining the res.lts.of many meas.rements.at different energies. In combination with meas.rements.of the nuclear compos.tion of the primaries. the s.ape of the energy s.ectrum places.cons.raints.on the number and s.ectra of s.urces.that may contribute to the obs.rved s.ectrum.

关键词： cos.ic radiation air s.owers

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：