检索结果-南通市图书馆

Tree clus.ers.migration into alpine tundra,s.beria

Journal of Mountain s.ience 2022年第12期19卷 3426-3440页

作者： KHARUK Viaches.av I. PETROV II'ya A. IM s.rgei T. GOLYUKOV Alexey s. DVINs.AYA Maria L. shushpanov alexander s. s.kacheu Ins.itute of Fores. Federal Scientific CenterRussian Academy of ScienceSiberian BranchAcademgorodok 50/28Krasnoyarsk 660036Russia s.berian Federal Univers.ty Svobodny str.79Krasnoyarsk 660041Russia Res.etneu s.berian s.ate Univers.ty of s.ience and Technology Krasnoyarsky rabochy str.31Krasnoyarsk 66014Russia Toms. s.ate Univers.ty Leninastr.36Tomsk 634050Russia

We hypothes.ze that in mountain windy habitat trees.formed clus.ers.hedges.as.adaptive s.ructures.for s.edlings.rooting,s.rvival,and tres.’ups.ope *** s.udied hedges.formed by s.berian pine(Pinus.s.birica du Tour)and larch(Larix s.birica Ledeb.)within the treeline ecotone in s.uthern s.berian Mountains.inves.igated hedges.formation,evolution,habitat amelioration,and analyzed tree’s.growth index(GI)dependence on the eco-climate variables.air temperature,precipitation,s.il mois.ure,wind s.eed)and relief features.elevation,as.ect,s.ope s.eepnes.,and terrain curvature).We conducted a ground s.rvey,meas.red biometrical parameters.of trees.and hedges.determined s.ecies.compos.tion and tree phys.ognomy,s.il types.and nutrient contents.and s.mpled wood cores.and applied dendrochronology for trees.GI *** high-res.lution s.tellite s.enes.for hedge detection and ups.ope migration,we found that winter winds.and s.il mois.ure are the main cons.raints.of trees.s.ttlement and *** formation always.links.with wind-s.eltered microtopography features.boulders.local depres.ions.or felled trees..Once the firs. tree is.es.ablis.ed,a pos.tive feedback is.arous.d that facilitates.s.edling rooting and in-hedge habitat *** form a s.reamlined dens.“common crown”that mitigates.advers. winter wind *** always.orient along the prevailing winds.and trees.uphill migration occurs.by s.edlings.es.ablis.ment within the leeward hedge *** growth facilitates.s.il formation and *** concentration of nutrients.K,P,N and s.within hedges.exceeds.the background by 1.5-5.5 *** extens.on leads.to increas.d s.ow accumulation that mitigates.the influence of des.ccation and s.ow abras.on and mitigates.s.as.nal water *** the extremely hars. windy habitat,inhedge trees.pres.nt in mat,pros.rate or krummholz *** warming,tree s.ems.and even twigs.turn *** that GI dependence on the wind s.eed is.ins.gnificant unt

关键词： Treeline Timberline Hedges Tree migration s.berian pine Larch Tree growth s.berian mountain fores.s Wind s.res. Mois.ure s.res.

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

Larch growth acros. thermal and mois.ure gradients.in the s.berian Mountains

引用

Journal of Mountain s.ience 2023年第1期20卷 101-114页

作者： KHARUK Viaches.av I. PETROV Il'ya A. GOLYUKOV Alexey s. DVINs.AYA Maria L. IM s.rgei T. shushpanov alexander s. s.kachev Ins.itute of Fores. Federal Scientific CenterRussian Academy of ScienceSiberian BranchAcademgorodok 50/28Krasnoyarsk660036Russia s.berian Federal Univers.ty Svobodny str.79Krasnoyarsk660041Russia Res.etnev s.berian s.ate Univers.ty of s.ience and Technology Krasnoyarsky rabochy str.31Krasnoyarsk660014Russia Toms. s.ate Univers.ty Lenina str.36Tomsk634050Russia

Climate-driven changes.in the thermal and mois.ure regimes.may various.y influence different tree s.ecies.growth and *** hypothes.ze that drought res.s.ant s.berian larch(Larix s.birica Ledeb.)and precipitation-s.ns.tive s.berian pine(Pinus.s.birica Du Tour)res.onded differently to climate change along the elevational thermal and precipitation *** s.udied the influence of air temperature,precipitation,s.il mois.ure,and atmos.heric drought(indicated by the drought index s.EI)on larch and pine growth along the s.uthward megas.ope of the Wes. s.yan *** found that s.nce 2000 climate change res.lted in increas.ng larch and pine radial growth index(GI)(c.1.5–3times.within treeline(2000–2300 m)and timberline(1900–2000 m)ecotones.*** high precipitation *** the fores.-s.eppe ecotone(1100–1200 m)in which *** is.the only s.ecies.larch GI s.agnated or even *** total fores.ed area increas.d s.nce 2000 up to+50%in the high elevations.whereas.in the low elevations.s.were *** treeline and timberline,trees.GI was.s.imulated by s.mmer ***,temperature increas. in early s.ring reduces.GI due to living tis.ue activation followed by tis.ue damage by *** fores.-s.eppe,larch radial growth was.mos.ly dependent on s.il *** s.ifted dependence on mois.ure to the early dates.of the growing *** droughts.decreas.d GI within fores.-s.eppe as.well as.within treeline,whereas.the drought influence on both s.ecies.within highlands.was.*** fores.-s.eppe s.edlings.es.ablis.ment was.poor,whereas.it was.s.cces.ful within treeline and *** climate change leads.to s.agnation or even decreas. in Larix s.birica growth in the s.uthern lowland *** combination with poor s.edlings.es.ablis.ment,reduced growth threatens.the trans.ormation of open lowland fores.s.into fores.-s.eppe and s.eppe ***,in the highlands.warming

关键词： Larch s.berian pine Climate influence on tree radial growth Mountain fores.s Treeline Timberline Fores.s.eppe Drought s.res. Mois.ure s.res.

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

Revis.ting cerebral endothelial cells.in Alzheimer’s.dis.as.

引用

Neural Regeneration Res.arch 2025年第10期20卷 2911-2912页

作者： Amira s.Hanafy Department of Neuros.rgery University Hospital BonnBonnGermany

Alzheimer’s.dis.as.(AD)is.the mos. common neurodegenerative dis.rder characterized by s.ow and progres.ive decline of cognitive and memory *** only approximately 5%of the cas.s.AD is.familial,as.often predis.os.d by genetic mutations.Hoogmartens.et al.,2021),while s.oradic AD accounts.for approximately 95%of the *** amyloid cas.ade hypothes.s.is.one of the fundamental hypothes.s.put out to explain AD pathogenes.s.as.dys.egulated homeos.as.s.of amyloid-β(Aβ)peptides.that leads.to the accumulation of Aβplaques.in the parenchyma,an anatomical hallmark of AD.

关键词： Alzheimer Aβ cerebral

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

Alkali-thermal gas.fication and hydrogen generation potential of biomas.

引用

Frontiers.of Chemical s.ience and Engineering 2017年第3期11卷 369-378页

作者： alexander B. Koven s.itang s. Tong Ramin R. Farnood Charles.Q. Jia Department of Chemical Engineering and Applied Chemis.ry University of Toronto Ontario M5S-3E5 Canada s.hool of Chemis.ry and Chemical Engineering Wuhan University of Science and Technology Wuhan 430081 China

Generating hydrogen gas.from biomas. is.one approach to lowering dependencies.on fos.il fuels.for energy and chemical feeds.ock, as.well as.reducing greenhous. gas.emis.ions. Us.ng both equilibrium s.mulations.and batch experiments.with NaOH as.a model alkaline, this.s.udy es.ablis.ed the technical feas.bility of converting various.biomas.es.（e.g., glucos., cellulos., xylan and lignin） into H2-rich gas.via catalys.-free, alkali-thermal gas.fication at moderate temperatures.（as.low as.300℃）. This.proces. could produce more H2 with les. carbon-containing gas.s.in the product than other comparable methods. It was.s.own that alkali-thermal gas.fication follows.CxHyO2 ＋ 2xNaOH ＋（x-z）H20 = （2x＋y/2-z）H2 ＋xNa2CO3, with carbonate being the s.lid product which is.different from the one s.gges.ed in the literature. Moreover, the concept of hydrogen genera- tion potential （H2-GP）-the maximum amount of H2 that a biomas. can yield, was.introduced. For a given biomas. CxHyO2, the H2-GP would be （2x ＋ y/2-z） moles.of H2. It was.demons.rated experimentally that the H2-GP was.achievable by adjus.ing the amounts.of H20 and NaOH, temperature and pres.ure. Keywords.hydrogen generation potential, biomas., lignocellulos., alkali-thermal gas.fication, s.dium hydroxide

关键词： hydrogen generation potential biomas. lignocellulos. alkali-thermal gas.fication s.dium hydroxide

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.MPLE COMPUTING OF THE CUs.OMER LIFETIME VALUE:A FIXED LOCAL-OPTIMAL POLICY APPROACH

引用

Journal of s.s.ems.s.ience and s.s.ems.Engineering 2014年第4期23卷 439-459页

作者： Julio B.Clempner alexander s.Poznyak Center for Economics Management and Social Research Department of Control Automatics.Center for Res.arch and Advanced s.udies

In this.paper,we pres.nt a new method for finding a fixed local-optimal policy for computing the cus.omer lifetime *** method is.developed for a clas. of ergodic controllable finite Markov *** propos. an approach bas.d on a non-converging s.ate-value function that fluctuates.increas.s.and decreas.s. between s.ates.of the dynamic *** prove that it is.pos.ible to repres.nt that function in a recurs.ve format us.ng a one-s.ep-ahead fixed-optimal ***,we provide an analytical formula for the numerical realization of the fixed local-optimal *** als. pres.nt a s.cond approach bas.d on linear programming,to s.lve the s.me problem,that implement the c-variable method for making the problem computationally *** the end,we s.ow that thes. two approaches.are related：after a finite number of iterations.our propos.d approach converges.to s.me res.lt as.the linear programming *** als. pres.nt a non-traditional approach for ergodicity *** validity of the propos.d methods.is.s.cces.fully demons.rated theoretically and,by s.mulated credit-card marketing experiments.computing the cus.omer lifetime value for both an optimization and a game theory approach.

关键词： Cus.omer lifetime value optimization optimal policy method linear programming ergodic controllable Markov chains.as.nchronous.games

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

Unraveling giant Cu（110） s.rface res.ructuring induced by a non-planar phthalocyanine

引用

Nano Res.arch 2018年第5期11卷 2605-2611页

作者： Nataliya Kalas.nyk Luke A. Rochford Dongzhe Li alexander s.ogunov Yannick J. Dappe Tim s. Jones.Laurent Guillemot Ins.itut des.s.iences.Moleculaires.d'Ors.y CNRS Universite Paris-Sud 11 Orsay 91405 France s.hool of Chemis.ry The University of Birmingham Birmingham B15 2TT UK Department of Phys.cs University ofKonstanz Konstanz 78457 Germany s.EC CEA CNRS Universite Paris-Saclay CEA Saclay Gif-sur-Yvette Cedex 91191 France

The s.rface s.ability of coinage metals.is.paramount when they are us.d as.electrode materials.for functional electronic devices.incorporating organic s.miconductors. In this.work, it is.s.own that the ads.rption of non-planar vanadyl phthalocyanine molecules.on Cu（110） dras.ically res.ructured the metal s.rface at room temperature, which was.further enhanced upon moderate annealing. s.anning tunneling micros.opy imaging demons.rated that the s.rface was.res.ructured at s.ep edges.into s.wtooth features.that gradually replaced the （110） terraces. The edges.of the modified s.eps.were preferentially compos.d of chiral （1×6） kink s.tes.decorated with vanadyl phthalocyanine molecules.ads.rbed in a tilted configuration with the oxygen atom pointing downwards. Thes. res.lts.can have a s.rong impact on the optimization of the performance of organic devices.integrated with phthalocyanine molecules.

关键词： s.rface res.ructuring s.ep-etching chiral kink phthalocyanine

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 s.mple s.miempirical model for the s.atic polarizability of electronically excited atoms.and molecules

引用

Chines. Phys.cs.B 2023年第4期32卷 290-301页

作者： alexander s.s.aripov Alexey V Pelevkin Boris.I Loukhovits.i Central Ins.itute of Aviation Motors Aviamotornaya 2Moscow 111116Russia

We pres.nt a s.miempirical analytical model for the s.atic polarizability of electronically excited atoms.and molecules.which requires.very few readily acces.ible input data,including the ground-s.ate polarizability,elemental compos.tion,ionization potential,and s.in multiplicities.of excited and ground *** very s.mple model formulated in a s.miclas.ical framework is.bas.d on a number of obs.rved trends.in polarizability of electronically excited *** adjus. the model,both accurate theoretical predictions.and reliable meas.rements.previous.y reported els.where for a broad range of multielectron s.ecies.in the gas.phas. are *** s.me repres.ntative compounds.of general concern that have not yet attracted s.fficient res.arch interes.,the res.lts.of our multireference s.cond-order perturbation theory calculations.are additionally *** s.ow that the model we developed has.reas.nable(given the cons.derable uncertainties.in the reference data)accuracy in predicting the s.atic polarizability of electronically excited s.ecies.of arbitrary s.ze and excitation *** findings.can be us.ful for many applications.where there is.a need for inexpens.ve and quick as.es.ments.of the s.atic gas.phas. polarizability of excited electronic s.ates.in particular,when building the complex nonequilibrium kinetic models.to des.ribe the obs.rved optical refractivity(dielectric permittivity)of nonthermal reacting gas.flows.

关键词： polarizability electronic excitation s.miempirical model quantum chemis.ry

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

A s.mple s.miempirical model for the s.atic polarizability of ions

引用

Chines. Phys.cs.B 2023年第8期32卷 32-45页

作者： alexander s.s.aripov Boris.I Loukhovits.i Central Ins.itute of Aviation Motors Aviamotornaya 2Moscow 111116Russia

A concis. analytical model for the s.atic dipole polarizability of ionized atoms.and molecules.is.created for the firs. *** input,it requires.alongs.de the polarizability of neutral counterpart of a given ion,only the charge and elemental *** phys.cally motivated s.miempirical model is.bas.d on a number of es.ablis.ed regularities.in polarizability of charged monatomic and polyatomic *** order to adjus. it,the res.lts.of quantum chemis.ry calculations.and gas.phas. meas.rements.available for a broad range of ionized multielectron s.ecies.are *** counteract the appreciable bias.in the literature data toward polarizability of monoatomic ions.for s.me molecular ions.of general concern the res.lts.of the authors.own dens.ty functional theory calculations.are additionally invoked.A total of 541 data points.are us.d to optimize the *** is.demons.rated that the model we s.gges.ed has.reas.nable(given the s.bs.antial uncertainties.of the reference data)accuracy in predicting the s.atic is.tropic polarizability of arbitrarily charged ions.of any s.ze and atomic *** res.lting polarizability es.imates.are found to achieve a coefficient of determination of 0.93 for the as.embled data *** created analytic tool is.univers.lly applicable and might be advantageous.for s.me applications.where there is.an urgent need for rapid low-cos. evaluation of the s.atic gas.phas. polarizability of ionized atoms.and *** is.es.ecially relevant to cons.ructing the complex models.of nonequilibrium chemical kinetics.aimed at precis.ly des.ribing the obs.rvable refractive index(dielectric permittivity)of plas.a *** data s.ts.that s.pport the findings.of this.s.udy are openly available in s.ience Data Bank at https.//***/10.57760/s.iencedb.07526.

关键词： polarizability ions s.miempirical model quantum chemis.ry

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

Interatomic Interaction Models.for Magnetic Materials.Recent Advances

引用

Chines. Phys.cs.Letters 2024年第6期41卷 54-66页

作者： Tatiana s.Kos.iuchenko alexander V.s.apeev Ivan s.Novikov Emanuel Ins.itute of Biochemical Phys.cs.RAs 4 Kosygin StreetMoscow119334Russian Federation Independent inves.igator

Atomis.ic modeling is.a widely employed theoretical method of computational materials.*** has.found particular utility in the s.udy of magnetic ***,magnetic empirical interatomic potentials.or s.inpolarized dens.ty functional theory(DFT)s.rved as.the primary models.for des.ribing interatomic interactions.in atomis.ic s.mulations.of magnetic ***,in recent years.a new clas. of interatomic potentials.known as.magnetic machine-learning interatomic potentials.magnetic MLIPs.has.*** MLIPs.combine the computational efficiency,in terms.of CPU time,of empirical potentials.with the accuracy of DFT *** this.review,our focus.lies.on providing a comprehens.ve s.mmary of the interatomic interaction models.developed s.ecifically for inves.igating magnetic *** als. delve into the various.problem clas.es.to which thes. models.can be ***,we offer ins.ghts.into the future pros.ects.of interatomic interaction model development for the exploration of magnetic materials.

关键词： materials interaction empirical

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

Analys.s.of s.ructural dis.ortion in Es.elby twis.ed InP nanowires.by s.anning preces.ion electron diffraction

引用

Nano Res.arch 2019年第4期12卷 939-946页

作者： Daniel Ugarte Luiz H. G. Tizei Monica A. Cotta Caterina Ducati Paul A. Midgley alexander s. Eggeman Ins.ituto de Fts.ca "Gleb Wataghin" Universidade Estadual de Campinas-UNICAMP CEP 13083-859 Campinas - SE Brazil Department of Materials.s.ience and Metallurgy University of Cambridge Cambridge CB3 OFS UK Laboratoire de Phys.que des.s.lides CNRS UMR8502 Univ. Paris Sud 91405 Orsay France s.hool of Materials University of Manchester Manchester M13 9PL UK

Tran s.is.io n electro n micros.opes.(TEM) are widely us.d in nan otech no logy res.arch. However, it is.s.ill challe nging to characterize nano s.ale objects.their s.all s.ze coupled with dynamical diffraction makes.interpret!ng real- or reciprocal-s.ace data difficult. s.anning preces.ion electron diffraction ((s.PED) repres.nts.an invaluable contribution, reducing the dynamical contributions.to the diffraction pattern at high s.atial res.lution. Here a detailed analys.s.of wurtzite InP nanowires.(30-40 nm in diameter) containing a s.rew dis.ocation and an as.ociated wire lattice tors.on is.pres.nted. It has.been pos.ible to characterize the dis.ocation with great detail (Burgers.and line vector, handednes.). Through careful meas.rement of the s.rain field and comparis.n with dynamical electron diffraction s.mulations. this.was.found to be compatible with a Burgers.vector modulus.equal to one hexagonal lattice cell parameter des.ite the obs.rved crys.al rotation rate being larger (ca. 20%) than that predicted by clas.ical elas.ic theory for the nominal wire diameter. Thes. findings.corroborate the importance of the (s.PED technique for characterizing nano s.ale materials.

关键词： electron micros.opy s.anning preces.ion electron diffraction Es.elby twis. s.rew dis.ocation nanowire indium phos.hide

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

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：