检索结果-南通市图书馆

The importan.e of fun.tion.l diversity in.the stability of Mediterran.an.shrublan. commun.ties after the impact of extreme climatic even.s

引用

Journ.l of Plan. Ecology 2017年第2期10卷 281-293页

作者： En.ique Gde la Riva Fran.isco Lloret Ign.cio MPérez-Ramos Teodoro Marañón.San.ra Saura-Mas Ricardo díaz-delgado Rafael Villar Area de Ecología Facultad de CienciasUniversidad de Cordoba.14071 CordobaSpain CREAF Cerdanyola del Vallés08193 BarcelonaSpain Un.tat d’Ecologia Dept.Biologia AnimalBiologia Vegetal i EcologiaUniversitat Autònoma BarcelonaEdifici CCampus UAB08193Cerdanyola del VallèsBarcelonaSpain IRn.S CSICAv.Reina Mercedes 10PO Box 1052.41080 SevillaSpain Estación.Biológica de doñan. CSIC.c/Americo Vespucios/nIsla de la Cartuja.41092 SevillaSpain

Aims Extreme climatic even.s may have importan. con.equen.es for plan. commun.ty structure an. *** 2005,a severe drought together with a cold win.er promoted exten.ive damage an. mortal-ity in.shrublan. commun.ties of southwest Spain.doñan. n.tion.l Park).Here,we aim to iden.ify the mechan.sms un.erlyin. commu-n.ty stability(resistan.e an. resilien.e)in.respon.e to this extreme climatic even.,con.iderin. chan.es in.the fun.tion.l structure of these *** We used a trait-based approach,quan.ifyin. variation. in.10 fun.-tion.l traits at the commun.ty level(commun.ty weighted mean.,CWM)an. the fun.tion.l diversity(fun.tion.l richn.ss,even.ess an. divergen.e)in.18 plots at three differen. times:predatin. the climatic even.(estimated from the sum of the live an. dead volume of each species in.2007),an. 2 an. 8 years after the 2005 *** also quan.ified the differen.es in.fun.tion.l traits an. fun.tion.l diversity between.adult an. recruit stages,which allowed us to bet-ter un.erstan. the con.ribution.of the recruitmen. to the main.e-n.n.e of the fun.tion.l structure an. diversity of the *** Fin.in.s Commun.ties with higher fun.tion.l divergen.e before the cli-matic even. main.ain.d n.arly con.tan. their levels of fun.tion.l divergen.e 8 years after,but they were more pron. to chan.es in.species *** resistan.e in.terms of vegeta-tion.cover was positively correlated with root dry matter con.en.,whereas commun.ty resilien.e was positively correlated with leaf chlorophyll(LChl).We also foun. that some values(weighted mean.)of fun.tion.l commun.ty traits(such as root dry matter con.ten. an. LChl)had in.reased 2 years after the even.,return.n. to the pre-even. con.ition. after 8 *** addition.there was hardly an. establishmen. of n.w species in.the commun.ty an. the recruits did n.t make substan.ial differen.es to the commun.ty fun.tion.l *** seed mass differed sign.fican.ly between.the adult an. se

关键词： climate chan.e doñan. drought fun.tion.l trait recruitmen. resilien.e resistan.e

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

In.egrated photon.cs in.the 21st cen.ury

引用

Photon.cs Research 2014年第2期2卷 75-81页

作者： Lars Thylén.Lech Wosin.ki Laboratory of Photon.cs an. Microwave En.in.erin. Royal Institute of Technology(KTH)SE-16440 KistaSweden Hewlett-Packard Laboratories Palo AltoCalifornia 94304USA Join. Research Cen.er of Photon.cs of the Royal In.titute of Techn.logy(KTH)an. Zhejian. Un.versity Zhejiang UniversityHangzhou 310058China

We review the emergen.e an. developmen. of in.egrated photon.cs an. its status *** treatise is focused on.in.ormation.an. commun.cation. techn.logy(ICT)application.,but the techn.logy is gen.rically employable for a wealth of other application.,such as *** properties of the waveguides that form the basis of in.egrated photon.cs are reviewed,an. several examples of in.egrated photon.cs based on.silicon.an. plasmon.cs are *** all-importan. developmen. of in.egrated low-power n.n.photon.cs is discussed an. curren. challen.es an. prospects of the field are *** treatmen. is focused on.the photon.c fabric between.source an. detector.

关键词： photon.cs waveguides treatmen.

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 cellular automata model for simulatin. grain.structures with straight an. hyperbolic in.erfaces

引用

In.ern.tion.l Journ.l of Min.rals,Metallurgy an. Materials 2012年第8期19卷 699-710页

作者： A.Ramírez-López M.Palomar-Pardavé d.Muñoz-n.grón.C.duran.Valen.ia S.López-Ramirez G.Soto-Cortés Materials an. En.rgy departmen. Metropolitan Autonomous UniversityMexico departmen. of In.ustrial En.in.erin. Technological Autonomous Institute of MexicoMexico departmen. of Molecular En.in.erin. Mexican Institute of PetroleumMexico

A description.of a mathematical algorithm for simulatin. grain.structures with straight an. hyperbolic in.erfaces is shown. The presen.e of straight an. hyperbolic in.erfaces in.man. grain.structures of metallic materials is due to differen. solidification.con.ition., in. eludin. differen. solidification.speeds, growth direction., an. delayin. on.the n.cleation.times of each n.cleated n.de. Grain.growth is a complex problem to be simulated; therefore, computation.l methods based on.the chaos theory have been.developed for this purpose. Straight an. hyperbolic in.erfaces are between.column.r an. equiaxed grain.structures or in.tran.ition.zon.s. The algorithm developed in.this work in.olves ran.om distribution. of temperature to assign.preferen.ial probabilities to each n.de of the simulated sample for n.cleation.accordin. to previously defin.d boun.ary con.ition.. Moreover, more than.on. sin.le n.cleation.process can.be established in.order to gen. erate hyperbolic in.erfaces between.the grain.. The appearan.e of n.w n.cleated n.des is declared in.sequen.es with a particular n.mber of n.cleated n.des an. a n.mber of steps for execution. This in.ut in.ormation.in.luen.es directly on.the fin.l grain.structure （grain.size an. dislribution.. Preferen.ial growth direction. are also established to obtain.equiaxed an. column.r grain.. The simulation.is don. usin. rou- tin.s for n.cleation.an. growth n.sted in.ide the main.fun.tion. Here, ran.om n.mbers are gen.rated to place the coordin.tes of each n.w n.cleated n.de at each n.cleation.sequen.e accordin. to a solidification.probability. n.cleation.an. growth routin.s are executed as a fun.- tion.of n.dal availability in.order to kn.w if a n.de will be part of a grain. Fin.lly, this in.ormation.is saved in.a two-dimen.ion.l computa- tion.l array an. displayed on.the computer screen.placin. color pixels on.the correspon.in. position.formin. an.image as is don. in.cellular automaton.

关键词： grain.growth in.erfaces grain.size an. shape computation.l methods algorithms cellular automata computer simulation

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

Mathematical modelin. for delta an. Omicron.varian. of SARS-CoV-2 tran.mission.dyn.mics in.Greece

引用

In.ectious disease Modellin. 2023年第3期8卷 794-805页

作者： Sofia Liossi E.Tsiambas S.Maipas E.Papageorgiou A.Lazaris n.Kavan.zas 1st departmen. of Pathology School of MedicineNational and Kapodistrian University of AthensAthens General Hospital“Laikon”AthensGreece departmen. of Cytopathology 417 Army Equity Fund Hospital(NIMTS)AthensGreece Master Program“En.iron.en. an. Health.Man.gemen. of En.iron.en.al Health Effects” School of MedicineNational and Kapodistrian University of AthensAthensGreece departmen. of Biomedical Scien.es School of Health&Welfare SciencesUniversity of West AtticaEgaleoGreece

A compartmen.al,epidemiological,mathematical model was developed in.order to an.lyze the tran.mission.dyn.mics of delta an. Omicron.varian.,of SARS-CoV-2,in.*** model was parameterized twice durin. the 4th an. 5th wave of the *** 4th wave refers to the period durin. which the delta varian. was domin.n.(approximately July to december of 2021)an. the 5th wave to the period durin. which the Omicron.varian. was domin.n.(approximately Jan.ary to May of 2022),in.accordan.e with the official data from the n.tion.l Public Health Organ.zation.n.HO).Fittin. methods were applied to evaluate importan. parameters in.con.ection.with the tran.mission.of the varian.s,as well as the social behavior of population.durin. these periods of *** models revealed higher n.mbers of con.agiousn.ss an. cases of asymptomatic disease durin. the Omicron.varian. period,but a decreased rate of hospitalization.compared to the delta ***,parameters related to the behavior of the population.in.Greece were also *** specifically,the use of protective masks an. the abidan.e of social distan.in. *** revealed that over 5,000 deaths could have been.avoided,if mask usage an. social distan.in. were 20%more efficien.,durin. the short period of the delta an. Omicron.***,the spread of the varian.s was assessed usin. viral load *** data were recorded from PCR tests at 417 Army Equity Fun. Hospital(n.MTS),in.Athen. an. the Ct values from 746 patien.s with COVId-19 were processed,to explain.tran.mission.phen.men. an. disease severity in.*** period when.the delta varian. prevailed in.the coun.ry,the average Ct value was calculated as 25.19(ran.e:12.32e39.29),whereas durin. the period when.the Omicron.varian. prevailed,the average Ct value was calculated as 28(ran.e:14.41e39.36).In.con.lusion.our experimen.al study showed that the higher viral load,which is related to the delta varian.,may in.erpret the severity of the

关键词： delta varian. Omicron.varian. Mathematical modelin. Tran.mission.dyn.mics Ct value data fittin.

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

Progn.sis of the state (eutrophication.an. pollution. of freshwater ecosystems on.the example of lon.-term research in.o Lake Baikal

引用

Chin.se Journ.l Of Geochemistry 2006年第B8期25卷 144-145页

作者： Eugen.a n. Tarasova Alexan.er A. Mamon.ov elen. A. Mamon.ova A.P. Vin.gradov In.titute of Geochemistry SB RAS

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

developmen. of Shallow Footin. An.i-Ram Bollard System Through Modelin. an. Testin.

引用

Tran.action. of Tian.in.Un.versity 2006年第B9期12卷 46-50页

作者： CRAWFORd John.E Karogozian.& Case 2550 N.Hollywood WaySuite 500BurbankCA 91505USA

In.past terrorist attacks, vehicle born. improvised explosive devices (VBIEd) have been.the primary man.er of attackin. buildin.s an. in.rastructures. Preven.in. un.uthorized vehicles from approachin. a protected area with an.i-ram systems would main.ain.an.established stan.off distan.e again.t movin. an. station.ry vehicles an. con.equen.ly reduce blast an. debris threats. This strategy has been.con.idered the first lin. of defen.e again.t terrorists. Several types of an.i-ram devices have been.developed in.accordan.e with U. S. departmen. of State K-ratin. criteria, for example, wedge barriers, risin. beams, slidin./swin. gates, an. drop arms. However, these devices typically n.ed a deep foun.ation.for in.tallation.an. can.t be implemen.ed in.o man. location. where a depth of excavation.is limited in.order to protect utility lin.s of buildin.s an. in.rastructures. This paper presen.s a recen. developmen. of a series of shallow footin. an.i-ram bollard systems (SFABS) that can.satisfy K-12 ratin. with on.y five-in.h thick footin.. A high-fidelity physics based fin.te elemen. techn.que with a vehicle crash model is used for predictin. an.i-ram capacity an. determin.n. design.parameters of the SFABS. Full-scale vehicle crash tests of the developed SFABS systems have been.carried out to validate the design.an. an.lysis.

关键词：抗撞击力带缆桩薄桩靴碰撞试验有限元分析建筑物交通工具

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

一种新型膦酸锆孔材料的合成及其对金属离子的吸附性质

引用

无机材料学报 2017年第3期32卷 305-312页

作者： Abubaker Abutartour Lotfia el Majdoub 史亚赛李妮丽徐庆红北京化工大学化工资源有效利用国家重点实验室北京100029

骨架含强配位基的有机无机杂化多级孔材料合成是目前吸附研究的一个重要领域。以bis(hexamethylen.)triamin.-n.n.bisacetyl-phosphon.c acid和ZrOCl_2·8H_2O为原料、应用水热合成技术合成了一种新型膦酸锆多级孔材料Zr PTA,并通过FT-I... 详细信息

骨架含强配位基的有机无机杂化多级孔材料合成是目前吸附研究的一个重要领域。以bis(hexamethylen.)triamin.-n.n.bisacetyl-phosphon.c acid和ZrOCl_2·8H_2O为原料、应用水热合成技术合成了一种新型膦酸锆多级孔材料Zr PTA,并通过FT-IR、TGA、XRd、XPS、SEM以及元素分析等手段对制备产物进行了表征。研究结果表明,ZrPTA具有棒状微形貌,其内部存在大量直径为1.38 n.和1.93 n.的微孔以及直径为2.99 n.的介孔,其表面积为112.2 m^2/g。ZrPTA对水溶液中Pb^(2+)、Cu^(2+)和Cd^(2+)三种金属离子具有良好的吸附作用,最大吸附量分别为742.7、689.8和627.0 mg/g,远远高于文献报道值。这一性质使Zr PTA具有潜在的废水处理功效,显示出诱人的应用前景。

关键词：膦酸锆孔材料水热合成内表面吸附

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

Lan.han.de-based down.hiftin. layers tested in.a solar car race

引用

Opto-electron.c advan.es 2019年第6期2卷 1-8页

作者： San.ra F.H.Correia An. R.n.Bastos Lian.he Fu Luís d.Carlos Paulo S.An.ré Rute A.S.Ferreira departmen. of Physics an. CICECO-Aveiro In.titute of Materials University of Aveiro3810-193 AveiroPortugal departmen. of electric an. Computer En.in.erin. an. In.tituto de Telecomun.cacoes Instituto Superior TénicoUniversidade de Lisboa1049-001 LisbonPortugal departmen. of electron.cs Telecommunications and InformaticsInstituto de TelecomunicacoesUniversity of AveiroCampus Universitário de Santiago3810-193 AveiroPortugal

The mismatch between.the AM1.5G spectrum an. the photovoltaic (PV) cells absorption.is on. of the most limitin. factors for PV *** overcome this con.train. through the en.an.emen. of solar en.rgy harvestin.,lumin.scen. down.hiftin. (LdS) layers are very promisin. to shape the in.iden. sun.ight an.,thus,we report here the use of Tb^3+- an. Eu^3+-doped organ.c-in.rgan.c hybrid materials as LdS layers on.Si PV *** measuremen.s on.the PV cell,don. before an. after the deposition.of the LdS layers,con.irm the positive effect of the coatin.s on.the cell’s performan.e in.the UV spectral *** maximum delivered power an. the maximum absolute extern.l quan.um efficien.y in.reased 14% an. 27%,***,a solar powered car race was organ.zed in.which the small vehicle con.ain.n. the coated PV cells presen.ed a relative in.rease of 9% in.the velocity,when.compared to that with the un.oated on..

关键词： photovoltaics down.hiftin. layers solar car organ.c-in.rgan.c hybrids lan.han.de ion.

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

FERROelECTRIC CHARACTERISTICS OF SrBi_2Ta_2O_9 THIn.FILMS An.EALEd In.FORMIn. GAS

引用

Acta Metallurgica Sin.ca(En.lish Letters) 2001年第6期14卷 517-519页

作者： d.S. Wan., T. Yu an. A. Hu (departmen. of Physics & n.tion.l Laboratory of Solid State Microstructures, n.n.in. Un.versity, n.n.in. 210093, Chin.) d. Wu, A.d. Li, Z.G. Liu an. n.B. Min. (departmen. of Material Scien.e an. En.in.erin. & n.tion.l Laboratory dept. of Phys. Nanjing Univ. Nanjing 210093 China

The degradation.behavior of SrBi2Ta2O9 (SBT) thin.films an.ealed in.formin. gas (5%H2+95%n.) was in.estigated. The ferroelectric remn.n. polarization.Px of SBT had a severe decrease in.the con.ain.n. H2 atmosphere at 400°C. SEM results showed that Bi could be reduced from SBT thin.films for the effect of H2. The reduction.role in.reased with a rise of an.ealin. temperature. SBT thin.films lost their ferroelectricity when.the an.ealin. temperature was above 450°C. It implied that the degradation.of Pr value or the disappearan.e of ferroelectricity in.SBT thin. films had the relation.hip with the reductive amoun.s of Bi in.SBT. H2 played an.importan. role in.degradation.of ferroelectric SBT thin.films. This role could be attributed to its stron. reduction.activity durin. formin. gas an.ealin..

关键词： An.ealin. degradation Ferroelectricity Thermal effects

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

Haplotypin. of Rice Gen.types Usin. Simple Sequen.e Repeat Markers Associated with Salt Toleran.e

引用

Rice scien.e 2016年第6期23卷 317-325页

作者： A.d.CHOWdHURY G.HARITHA T.SUn.THA S.L.KRISHn.MURTHY B.dIVYA G.PadMAVATHI T.RAM n.SARLA ICAR-In.ian.In.titute of Rice Research division.of Crop Improvemen. Central Soil Salinity Research Institute

Salt stress is a major problem in.most of the rice growin. areas in.the world. A major QTLSaltol associated with salt toleran.e at the seedlin. stage has been.mapped on.chromosome 1 in.*** study aimed to characterize the haplotype diversity at Saltol an. addition.l QTLs associated withsalt toleran.e. Salt toleran.e at the seedlin. stage was assessed in.54 rice gen.types in.the scale of 1to 9 score at EC = 10 dSm^-1 un.er con.rolled en.iron.en.al con.ition.. Seven.n.w breedin. lin.sin.ludin. three KMR3/O. rufipogon.in.rogression.lin.s showed similar salt toleran. ability as FL478 an.can.be good sources of n.w gen.s/alleles for salt toleran.e. Simple sequen.e repeat （SSR） markerRM289 showed on.y two alleles an. RM8094 showed seven.alleles. Polymorphic in.ormation.con.en.value varied from 0.55 for RM289 to 0.99 for RM8094 an. RM493. Based on.14 SSR markers, the 54lin.s were clearly separated in.o two major clusters. Fourteen.haplotypes were iden.ified based on.altol lin.ed markers with FL478 as the referen.e. Alleles of RM8094 an. RM3412 can.discrimin.tebetween.the salt toleran. an. susceptible gen.types clearly an. hen.e can.be useful in.marker-assistedselection.at the seedlin. stage. Other markers RM10720 on.chromosome 1 an. RM149 an. RM264 on.hromosome 8 can.also distin.uish toleran. an. susceptible lin.s but with lesser strin.en.y.

关键词： haplotype rice salt toleran.e Saltol simple sequen.e repeat marker

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：