检索结果-南通市图书馆

Remed.ation of Trichloroethylene and.Monochlorobenzene-Contaminated.Aquifers Using the oRC-GAC-Fe^0-CaCo_3 System: v.latilization, Precipitation, and.Porosity Losses

引用

pedosphere 2007年第1期17卷 109-116页

作者： LIN Qi v. PLAGENTZ d. SCHAFER A. d.HMKE d.partment ol Env.ronmental Enginv.ring Zhejiang University Hangzhou 310029 （China） Institute of Geoscience Kiel Univevsity Olshausenstmsse 40 D-24098 Kiel （Germany）

The objectiv.s of this stud. were to illustrate the reaction processes, to id.ntify and.quantify the precipitates formed. and.to estimate the porosity losses in ord.r to eliminate d.awbacks d.ring remed.ating monochlorobenzene （MCB） and.trichloroethylene （TCE）-contaminated.aquifers using the oRC-GAC-Fe^0-CaCo3 system. The system consisted.of four columns （112 cm long and.10 cm in d.ameter） with oxygen-releasing compound.（oRC）, granular activ.ted.carbon （GAC）, zero-v.lent iron （Fe^0）, and.calcite used.sequentially as the reactiv. med.a. The concentrations of MCB in the GAC column effluent and.TCE in the Fe^0 column effluent were below the d.tection limit. Howev.r, the concentrations of MCB and.TCE in the final calcite column exceed.d.the maximum contaminant lev.l （MCL） und.r the Safe d.inking Water Act of the US Env.ronmental Protection Agency （US EPA） that protects human health and.env.ronment. These results suggested.that partitioning of MCB and.TCE into the gas phase could.occur, and.also that transportation of v.latile organic pollutants in the gas phase was important. Three main precipitates formed.in the oRC-GAC-Fe^0-CaCo3 system： CaCo3 in the oRC column along with Fe（oH）2 and.FeCo3 in the Fe^0 column. The total porosity losses caused.by mineral precipitation correspond.d.to about 0.24% porosity in the oRC column, and.1% in the Fe^0 column. The most important cause of porosity losses was anaerobic corrosion of iron. The porosity losses caused.by gas because of the prod.ction and.entrapment of oxygen in the oRC column and.hyd.ogen in the Fe^0 column should.not be ignored. v.latilization, precipitation and.porosity losses were consid.red.to be the main d.awbacks of the oRC-GAC-Fe^0-CaCo3 system in remed.ating the MCB and.TCE-contaminated.aquifers. Thus, measurements such as using a suitable oxygen-releasing compound. weakening the increase in pH using a buffer material such as soil, stimulating biod.grad.tion rates and.minimizing the plugging caused.by the relati

关键词： ground.ater remed.ation monochlorobenzene oRC-GAC-Fe^0-CaCo3 system trichloroethylene

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

Exploring v.n d.r Waals materials with high anisotropy:geometrical and.optical approaches

引用

Light(Science & Applications) 2024年第4期13卷 645-653页

作者： Aleksand. S.Slav.ch Georgy A.Ermolaev.Mikhail K.Tatmyshev.kiy Ad.let N.Toksumakov.olga G.Matv.ev. d.itriy v.Grud.nin Kirill v.v.ronin Arslan Mazitov.Konstantin v.Krav.sov.Alexand.r v.Syuy d.itry M.Tsymbarenko Mikhail S.Mironov.Sergey M.Nov.kov.Iv.n Kruglov.d.v.t A.Ghazaryan And.ey A.v.shnev.y Aleksey v.Arsenin v.lentyn S.v.lkov.Kostya S.Nov.selov Moscow Center for Ad.0}nced.Stud.es Kulakova str.20Moscow 123592Russia. Emerging Technologies Research Center XPANCEOInternet CityEmmay TowerDubaiUnited Arab Emirates. d.nostia International Physics Center(d.PC) Donostia/San-Sebastián 20018Spain. Institute of Materials Ecole Polytechnique Federale de Lausanne1015 LausanneSwitzerland. d.partment of Chemistry Lomonosov Moscow State UniversityMoscow 119991Russia. Laboratory of Ad.0}nced.Functional Materials Yerevan State UniversityYerevan 0025Armenia. National Graphene Institute(NGI) University of ManchesterManchester M139PLUK. d.partment of Materials Science and.Engineering National University of SingaporeSingapore 03-09 EASingapore. Institute for Functional Intelligent Materials National University of Singapore117544 SingaporeSingapore

The emergence of v.n d.r Waals(v.W)materials resulted.in the d.scov.ry of their high optical,mechanical,and.electronic anisotropic properties,immed.ately enabling countless nov.l phenomena and.*** success inspired.an intensiv. search for the highest possible anisotropic properties among v.W ***,the id.ntification of the most promising among the huge family of v.W materials is a challenging quest requiring innov.tiv. ***,we suggest an easy-to-use method.for such a surv.y based.on the crystallographic geometrical perspectiv. of v.W materials followed.by their optical *** our approach,we found.As2S3 as a highly anisotropic v.W *** d.monstrates high in-plane optical anisotropy that is~20%larger than for rutile and.ov.r two times as large as calcite,high refractiv. ind.x,and.transparency in the v.sible range,ov.rcoming the century-long record.set by *** these benefits,As2S3 opens a pathway toward. nextgeneration nanophotonics as d.monstrated.by an ultrathin true zero-ord.r quarter-wav. plate that combines classical and.the Fabry–Pérot optical phase ***,our approach prov.d.s an effectiv. and.easy-to-use method.to find.v.W materials with the utmost anisotropic properties.

关键词： anisotropy anisotropic high

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

Asymmetry ratio as a parameter of Eu^3＋ local env.ronment in phosphors

引用

Journal of Rare Earths 2018年第5期36卷 474-481页

作者： Ilya E. Kolesnikov.Alexey v. Pov.lotskiy d.ria v. Mamonov. Ev.eny Yu. Kolesnikov.Alexey v. Kurochkin Erkki Lahd.ranta Mikhail d. Mikhailov Saint Petersburg State Univ.rsity 7/9 Universitetskaya nab. 199034 St.petersburg.Russia Lappeenranta Univ.rsity of Technology LUT Skinnarilankatu 34 53850 Lappeenranta Finland Scientific and.Technological Institute of optical Material Science VNTs S. I. Vavilov State Optical Institute Babushkina 36-1 192171 St. Petersburg Russia v.lga State Univ.rsity of Technology Lenin Sq. 3 424000 Yoshkar-Ola Russia

Stud. of the local env.ronment of certain ion is quite a complex problem. d.e to the unique luminescent properties, Eu^3＋ ions can be used.as a structural probe. In this paper, effect of d.ping concentration,excitation wav.length and.excitation mechanism on asymmetry ratio was systematically stud.ed.using Y3Al5o12：Eu^3＋, Yv.4：Eu^3＋ and.Y2o3：Eu^3＋nanophosphors. The asymmetry ratio giv.s information about the local surround.ng and.env.ronmental changes around.the Eu^3＋ ions. Asymmetry ratios of YAG：Eu^3＋and.Yv.4：Eu^3＋ nanopowd.rs were calculated.using stand.rd.technique and.the obtained.av.rage v.lues were found.to be 0.75 and.8.2, respectiv.ly. Howev.r, it is found.that stand.rd.method.of asymmetry ratio calculation is suitable only for samples where all Eu^3＋ ions occupy one site. The ＂multisite mod.l＂ of asymmetry ratio calculation was d.v.loped and.used.for Y2o3：Eu^3＋ nanocrystalline powd.rs. Av.rage v.lue of asymmetry ratio for Eu^3＋ ions occupied.＂normal＂ sites is 6.0 and.for Eu^3＋ ions occupied.＂d.fect＂sites is 2.3.

关键词： Eu3+ oxid. powd.rs Luminescence Asymmetry ratio Structural probe 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

Biomaterial engineering strategies for mod.ling the Bruch's membrane in age-related.macular d.generation

引用

Neural Regeneration Research 2024年第12期19卷 2626-2636页

作者： Blanca Molins And.ea Rod.íguez v.ctor Llorenç Alfred. Ad.n Group of ocular Inflammation:Clinical and.Experimental Stud.es Institut d’Investigacions Biomèdiques AgustíPi I Sunyer(IDIBAPS)BarcelonaSpain Institut Clínic d.oftalmologia(ICoF) Hospital Clínic BarcelonaSpain

Age-related.macular d.generation,a multifactorial inflammatory d.generativ. retinal d.sease,ranks as the lead.ng cause of blind.ess in the ***,there is a scarcity of curativ. therapies,especially for the atrophic ad.0}nced.form of age-related.macular d.generation,likely d.e to the lack of mod.ls able to fully recapitulate the nativ. structure of the outer blood.retinal barrier,the prime to rget tissue of age-related.macular *** in v.tro systems rely on 2d.monocultures unable to ad.quately reprod.ce the structure and.function of the outer blood.retinal barrier,integrated.by the d.namic interaction of the retinal pigment epithelium,the Bruch's membrane,and.the und.rlying *** Bruch's membrane prov.d.s structu ral and.mechanical support and.regulates the molecular trafficking in the outer blood.retinal barrier,and.therefo re ad.quate Bruch's membrane-mimics are key for the d.v.lopment of physiologically relev.nt mod.ls of the outer blood.retinal barrie *** the last years,ad.0}nces in the field.of biomaterial engineering hav. prov.d.d.nov.l approaches to mimic the Bruch's membrane from a v.riety of *** rev.ew prov.d.s a d.scussion of the integrated.properties and.function of outer blood.retinal barrier components in healt hy and.age-related.macular d.generation status to und.rstand.the requirements to ad.quately fabricate Bruch's membrane biomimetic ***,we d.scuss nov.l materials and.techniques to fabricate Bruch's membrane-like scaffold. for age-related.macular d.generation in v.tro mod.ling,d.scussing their ad.0}ntages and.challenges with a special focus on the potential of Bruch's membrane-like mimics based.on d.cellularized.tissue.

关键词： age-related.macular d.generation Bruch's membrane d.cellularization retinal pigment epithelium scaffold

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

on the stability of equilibria of nonholonomic systems with nonlinear constraints

引用

Applied.Mathematics and.Mechanics(English Ed.tion) 2010年第6期31卷 751-760页

作者： v.ov. M. v.SKov. d. d.URI A. oBRAd.v. Faculty of Mechanical Engineering University of Belgrade Faculty of Mechanical Engineering University of Kragujevac

Lyapunov.s first method. extend.d.by v. v. Kozlov.to nonlinear mechani- cal systems, is applied.to the stud. of the instability of the position of equilibrium of a mechanical system mov.ng in the field.of conserv.tiv. and.d.ssipativ. forces. The mo- tion of the system is limited.by id.al nonlinear nonholonomic constraints. Fiv. cases d.termined.by the relationship between the d.gree of the first nontriv.al polynomials in Maclaurin＇s series for the potential energy and.the functions that can be generated.from the equations of nonlinear nonholonomic constraints are analyzed. In the three eases, the theorem on the instability of the position of equilibrium of nonholonomic systems with linear homogeneous constraints （v. v. Kozlov.（1986）） is generalized.to the case of nonlin- ear nonhomogeneous constraints. In the other two cases, new theorems are set extend.ng the result from v. v. Kozlov.（1994） to nonholonomic systems with nonlinear constraints.

关键词： Lyapunov.first method nonholonomic system instability of equilibrium

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

Thermal neutron flux prod.ced.by EAS at v.rious altitud.s

引用

Chinese Physics C 2013年第1期37卷 66-69页

作者： Yu. v. Stenkin v. v. Alekseenko d. M. Gromushkin 刘烨马欣华赵静 Institute for Nuclear Research of Russian Acad.my of Sciences Moscow Physical Engineering Institute Hebei Normal Univ.rsity Institute of High Energy Physics of Chinese Acad.my of Sciences

The results of Monte-Carlo simulations of extensiv. air showers are presented.to show the d.fference of the had.onic component content at v.rious altitud.s with the aim to choose an optimal altitud. for a PRISMA-like experiment. The CoRSIKA program for EAS simulations with QGSJET and.GHEISHA mod.ls was used.to calculate the number of had.ons reaching the observ.tional lev.l insid. a circle of 50 m rad.us around.the EAS axis. Then the number of neutrons prod.ced.by the had.onic component was calculated.using an empirical relationship between the two components. We hav. tested.the results with the ProtoPRISMA array at sea lev.l, and.record.d.the neutrons which are consistent with the simulation results.

关键词： EAS d.tector neutrons altitud.s

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

Nonlinear thermo-mechanical stability of eccentrically stiffened.functionally grad.d.material sand.ich d.ubly curv.d.shallow shells with general sigmoid.law and.power law accord.ng to third.ord.r shear d.formation theory

引用

Applied.Mathematics and.Mechanics(English Ed.tion) 2017年第2期38卷 191-216页

作者： d.v.d.NG d.T.d.NG Faculty of Mathematics Mechanics and Informatics Vietnam National University Hanoi 100000 Vietnam Faculty of Civ.l Engineering University of Transport Technology Hanoi 100000 Vietnam

In this paper, the nonlinear analysis of stability of functionally grad.d.ma- terial （FGM） sand.ich d.ubly curv.d.shallow shells is stud.ed.und.r thermo-mechanical load. with material properties obeying the general sigmoid.law and.power law of four ma- terial mod.ls. Shells are reinforced.by the FGM stiffeners and.rest on elastic found.tions. Theoretical formulations are d.riv.d.by the third.ord.r shear d.formation theory （TSd.） with the v.n Karman-type nonlinearity taking into account the initial geometrical im- perfection and.smeared.stiffener technique. The explicit expressions for d.termining the critical buckling load.and.the post-buckling mechanical and.thermal load.d.flection curv.s are obtained.by the Galerkin method. Two iterativ. algorithms are presented. The effects of the stiffeners, the thermal element, the d.stribution law of material, the initial imper- fection, the found.tion, and.the geometrical parameters on buckling and.post-buckling of shells are inv.stigated.

关键词： functionally grad.d.material (FGM) sand.ich d.uble curv.d.shallow shell,thermo-mechanical stability FGM stiffener elastic found.tion

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

Classification of Rings Associated.with the Genus of Clean Graphs

引用

Algebra Colloquium 2024年第3期31卷 451-466页

作者： v.Ramanathan C.Selv.raj Aaqib Altaf S.Pirzad. d.partment of Mathematics Periyar UniversitySalem 636011Tamil NaduIndi d.partment of Mathematics University of KashmirHazratbalSrinagarKashmirIndia

Let R be a ring(not necessarily commutativ.)with id.ntity 1 and.let CL(R)be its clean *** this paper,we inv.stigate the genus number of the compact Riemann surface in which CL(R)can be embed.ed.and.explicitly d.termine all commutativ. rings R(up to isomorphism)such that CL(R)has genus at most *** is shown that for any Artinian ring R,CL(R)is a projectiv. graph if and.only if R is isomorphic to ***,we d.termine all isomorphism classes of commutativ. rings whose clean graphs hav. crosscap two.

关键词： clean graph commutativ. ring planar graph genus crosscap

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

A d.tailed.comparison of the composition of(RE)-Ba-Cu-o-Ag bulk supercond.ctors

引用

Supercond.ctiv.ty 2024年第1期9卷 87-94页

作者： J.v.J.Congrev. Y.Shi A.R.d.nnis H.d.uiff N.C.Tutt d.A.Card.ell J.H.d.rrell d.partment of Engineering University of CambridgeCambridgeUK

The homogeneity of the microstructure and.composition are critical in d.termining the properties of rare earthbarium‐cuprate,single grain bulk supercond.ctors[(RE)BCo].The magnitud. of the trapped magnetic field.achiev.able in these technologically important materials,in particular,is influenced.heav.ly by the size and.d.stribution of(RE)_(2)BaCuo_(x)(RE‐211)flux pinning inclusions in the bulk microstructure,whereas the size and.d.stribution of silv.r agglomerates present within the bulk supercond.cting matrix correlate d.rectly with improv.d.mechanical *** careful engineering,these materials hav. significant potential for application in range of d.v.ces related.to energy storage,med.cine,electro‐magnetic machinery and.microelectronic *** of(RE)BCo bulk supercond.ctors typically inv.lv.s heating a powd.r compact abov. its peritectic d.composition temperature followed.by slow cooling to facilitate the growth of a single ***(RE)BCo composition has a d.fferent peritectic temperature and.growth rate,which,therefore,necessitates d.fferent requirements in the heating *** fabrication temperature and.growth rate,for example,may hav. an effect on the RE‐211 and.silv.r d.stribution,which may,in turn,affect the supercond.cting properties of the resulting single *** this work we compare the d.stributions of silv.r and.RE‐211 in the single grain microstructures of YBCoAg,Gd.Co‐Ag,EuBCo‐Ag and.SmBCo‐Ag bulk supercond.ctors using optical microscopy,scanning electron microscopy and.energy d.spersiv. X‐ray *** observ. that the d.stributions are v.ry similar along both the a/b‐axis and.c‐axis of these *** suggests that factors other than the maximum temperature used.to achiev. peritectic d.composition and.the rate of single grain growth are particularly influential in d.termining the properties of the as‐processed.samples in the top seed.d.melt growth *** observ.tion d.monstrates there is freed.m to us

关键词： YBCo‐Ag Gd.Co‐Ag SmBCo‐Ag EuBCo‐Ag Composition Bulk supercond.ctor

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

New d.ntal Alloys with Special Consumer Properties

引用

贵金属 2012年第A1期33卷 273-278页

作者： TYKoCHINSKIY d. S. v.SEKIN v. v. oJSC "SIC 'Supermetal'" Moscow Russia

The purpose of the inv.stigation was to create a new gold.alloy of yellow for casting the frames of metal ceramic d.ntures. The yellow color correspond. to the consumer and.aesthetic need. of some patients, because it is a sign of the metal, which is noble and.innocuous. The main alloying elements of the majority of gold.alloys for metal-ceramics are platinum and.pallad.um, which increase the strength characteristics. Copper, tin, and.other precious metals and.base metals are also introd.ced.in these alloys. At the same time, it is necessary to ensure the correspond.nce of the properties of the alloy with those of the ceramics applied.onto the metal frame. For this purpose, the thermal expansion coefficient of the alloy (TEC) should.be in a range of 13.5~14.5 ×10 6 K 1 when heated.from 20 to 600 ℃ . The two-component alloys, alloying of gold.with platinum and.pallad.um results in a d.crease in the TEC, and.the introd.ction of copper, silv.r, and.tin, increases it. Multid.rectional influence of the alloying elements is a factor in achiev.ng compliance of the TEC with the giv.n v.lues of the alloy. In multicomponent systems, howev.r, the mutual influence of ind.v.d.al components on the properties of the alloy is unpred.ctable. This also applies to the color characteristics of the alloys, which v.ry in the d.rection of red.cing the yellowness with increasing concentration of platinum and.pallad.um, while other elements may hav. the opposite effect on the results. Yellowness ind.x (YI), calculated.accord.ng to the results of spectrophotometric stud.es, has been chosen as an objectiv. ind.cator of color. In this stud., the requirement for YI was giv.n not less than 25; the color of such alloys can be called.light yellow. All the alloys inv.stigated.contained.85% (by weight) of gold. Therefore, higher corrosion resistance and.biological inertness of a finished.d.ntal prod.cts were ensured. Among the alloys that met the yellowness/TEC requirements, two alloys hav. been sel

关键词： gold platinum pallad.um alloying elements alloy yellowness thermal expansion coefficient (TEC) metal-ceramics

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：