检索结果-南通市图书馆

(Not) an elementar. question:How to mobilize the ir.n in the wall?

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Molecular.Plant 2021年第10期14卷 1610-1611页

作者： stephan Clemens Depar.ment of Plant Physiology and Faculty of Life Sciences:Food Nutrition and HealthUniversity of BayreuthUniversitätsstrasse 3095440 BayreuthGermany

Photosynthesis,r.spir.tion,and countless other.pr.cesses ar. dependent on pr.teins that car.y ir.n(Fe)as an essential *** Fe was r.cr.ited for.biological functions ear.y in evolution,it was an available *** Ear.h's at... 详细信息

关键词： element. elementar. sulfide

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

r.ots dOdge str.Ss

Molecular.Plant 2023年第12期16卷 1885-1886页

作者： stephan Clemens Depar.ment of Plant Physiology University of BayreuthUniversitatsstrasse 3095440BayreuthGermany

A hallmar. of plant development is *** system ar.hitectur. modulation in r.sponse to fluctuations of nutr.ent and water.supply is a case in point(Giehl et al.,2014).The for.ation and length of later.l r.ots or.the density of r.ot hair. ar. str.ngly influenced by the availability of macr.-and *** actively for.ge for.miner.l-r.ch patches in the typically heter.geneous soil envir.nment and adjust their.development systemically to incr.ase the sur.ace for.nutr.ent ***,the opposite can happen as well.A r.cent study by Wang et al.(2023)convincingly demonstr.ted an active avoidance of unfavor.ble conditions by r.ce *** the seminal r.ot of r.ce seedlings was placed between two agar.blocks,one of them containing cations at toxic concentr.tions,adventitious r.ots developed only on the non-str.ss side,while development on the str.ss side was ar.ested(Figur. 1).Besides,far.mor. later.l r.ots wer. for.ed than in the absence of asymmetr.cally applied *** a while,this r.sulted in a total r.ot biomass equivalent to that of contr.l *** r.ots,in other.wor.s,had successfully shifted away fr.m the str.ssful envir.nment.

关键词： soil r.ots Figur.

On combinator.al Gauss-Bonnet Theor.m for.gener.l Euclidean simplicial complexes

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Fr.ntier. of Mathematics in China 2016年第5期11卷 1345-1362页

作者： stephan KLAUS Scientific Administr.tor.of the MFO and Adjunct Pr.fessor.at Mainz Univer.ity Mathematisches Forschungsinstitut Oberwolfach gGmbH (MFO) Schwarzwaldstrasse 9-11 D-77709 Oberwolfach-Walke Germany

For.a finitely tr.angulated closed sur.ace M2, let αx be the sum of angles at a ver.ex x. By the well-known combinator.al ver.ion of the 2- dimensional Gauss-Bonnet Theor.m, it holds ∑x（2π- αx） =2αχ（M^2）, wher. X denotes the Euler.char.cter.stic of M^2, αx denotes the sum of angles at the ver.ex x, and the sum is over.all ver.ices of the tr.angulation. We give her. an elementar. pr.of of a str.ightfor.ar. higher.dimensional gener.lization to Euclidean simplicial complexes K without assuming any combinator.al manifold condition. Fir.t, we r.call some facts on simplicial complexes, the Euler.char.cter.stics and its local ver.ion at a ver.ex. Then we define δ（τ） as the nor.ed dihedr.l angle defect ar.und a simplex τ. Our.main r.sult is ∑τ（-1）^dim（τ）δ（τ） = χ（K）, wher. the sum is over.all simplices τ of the tr.angulation. Then we give a definition of cur.atur. k（x） at a ver.ex and we pr.ve the ver.ex-ver.ion ∑x∈K0 k（x） = χ（K） of this r.sult. It also possible to pr.ve Mor.e-type inequalities. Mor.over. we can apply this r.sult to combinator.al （n ＋ 1）-manifolds W with boundar. B, wher. we pr.ve that the differ.nce of Euler.char.cter.stics is given by the sum of cur.atur.s over.the inter.or.of W plus a contr.bution fr.m the nor.al cur.atur. along the boundar. B： χ（W）- 1/2 χ（B） = ∑τ∈W-B（-1）^dim（τ）δ（τ）＋ ∑τB（-1）^dim（τ）ρ（τ）.

关键词： Cur.atur. dihedr.l angle Euclidean simplex tr.angulation Euler.char.cter.stic Euler.manifold combinator.al manifold pseudo manifold

A two dimensional Euler.Lagr.ngian model of wood gasification in a char.oal bed-Par. II： Par.meter.influence and compar.son

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Par.icuology 2017年第6期15卷 22-30页

作者： stephan Ger.er.Michael Oever.ann Fr.ie Univer.itat Ber.in Arnimallee 6 14195 Berlin Germany Chalmer. Univer.ity of Technology Department of Applied Mechanics Division of Combustion Gothenburg Sweden

A Euler.Lagr.ngian simulation was employed for.a compr.hensive par.meter.study of wood gasification in a fluidized char.oal bed. The par.meter. that wer. var.ed include the initial bed temper.tur., fuel mass flow r.te, iner. tar.fr.ction, and kinetic ener.y losses caused by par.icle-par.icle and par.icle-wall colli- sions. The r.sults of each par.meter.var.ation ar. compar.d with a base scenar.o, pr.viously descr.bed in detail in Par. I of this study （Ger.er.＆ Oever.ann, 2014）. The r.sults ar. inter.r.ted by compar.ng the r.actor.outlet temper.tur., aver.ged par.icle temper.tur., over.ll wood mass, over.ll char.oal mass, concentr.tions of sever.l gaseous species, and axial bar.center.data for.par.icles obtained with differ. ent sets of par.meter.. The iner. tar.fr.ction and fuel mass flow r.te ar. the most sensitive par.meter. while the par.icle-par.icle and par.icle-wall contact par.meter. have only a small impact on the r.sults. Incr.asing the r.active tar.components by 19% almost doubled the amount of r.active tar. at the r.ac- tor.outlet, while decr.asing the r.stitution coefficients of the par.icle collisions by 0.2 r.sults in higher.over.ll gas pr.duction but almost no change in bed height. Her.in, our.numer.cal r.sults ar. discussed in detail while assessing the model r.str.ctions.

关键词： Wood gasification simulation Gas-solid flow Discr.te element method Pyr.lysis Gasification Char.oal

Hor.–Schunck optical flow applied to defor.ation measur.ment of a bir.like air.oil

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Jour.al of Aer.nautics 2015年第5期28卷 1305-1315页

作者： Gong Xiaoliang stephan Bansmer School of Aer.nautics Northwestern Polytechnical University Institute of Fluid Mechanics Technische Universitt Braunschweig

Cur.ent defor.ation measur.ment techniques suffer.fr.m limited spatial r.solution. In this wor., a highly accur.te and high-r.solution Hor. Schunck optical flow method is developed and then applied to measur.ng the static defor.ation of a bir.like flexible air.oil at a ser.es of angles of attack at r.ynolds number.100,000 in a low speed, low noise wind tunnel. To allow r.latively lar.e displacements, a nonlinear.Hor.-Schunck model and a coar.e-to-fine war.ing pr.cess ar. adopted. To pr.ser.e optical flow discontinuities, a nonquadr.tic penalization function, a multi- cue dr.ven bilater.l filter.ng and a pr.nciple component analysis of local image patter.s ar. used. Fir.t, the accur.cy and conver.ence of this Hor.-Schunck technique ar. ver.fied on a benchmar.. Then, the maximum displacement that can be r.liably calculated by this technique is studied on synthetic images. Both studies ar. compar.d with the per.or.ance of a Lucas-Kanade optical flow method. Finally, the Hor.-Schunck technique is used to estimate the 3-D defor.ation of the bir.like air.oil thr.ugh a ster.oscopic camer. setup. The r.sults ar. compar.d with those computed by Lucas-Kanade optical flow, image cor.elation and numer.cal simulation.

关键词： Defor.ation measur.mentsFlexible air.oil Hor.-Schunck Optical flow Ster.oscopic

Pr.ter.zoic tectonother.al pr.cesses imaged with magnetotellur.cs and seismic r.flection in souther. Austr.lia

在线全文

学校读者我要写书评

暂无评论

Geoscience Fr.ntier. 2020年第3期11卷 885-893页

作者： Tom Wise stephan Thiel Geological Sur.ey of South Austr.lia Department for Energy and MiningAdelaideSA5005Australia School of Ear.h and Envir.nmental Sciences University of AdelaideAdelaideSA5005Australia

Over.the last two decades,co-located seismic and magnetotellur.c(MT) pr.files pr.vided fundamental geophysical data sets to image the Austr.lian *** their.complimentar. natur.,the data ar. pr.cessed and often inter.r.ted separ.tely without common pr.cesses in *** her. qualitatively compar. 2 D r.sistivity inver.ion models der.ved fr.m MT and seismic r.flection pr.files acr.ss a r.gion of Ar.hean-Pr.ter.zoic Austr.lia to addr.ss the causes of var.ations in seismic r.sponse and anomalous conductivity in the *** find that ther. exists a spatial association between r.gions of low r.flectivity in seismic sections and low r.sistivity in co-located2 D MT modelled *** r.lationships elucidate possible signatur.s of past magmatic and fluid-r.lated *** on their.diffuse or.discr.te char.cter.we hypothesize these signatur.s signify fossil melting of the cr.st due to mafic under.lating,magma movement or.hydr.ther.al fluid flow thr.ugh the *** appr.ach discussed her.in is a pr.cess-or.ented appr.ach to inter.r.tation of geophysical images and a significant extension to tr.ditional geophysical methods which ar. pr.mar.ly sensitive to a singular.bulk r.ck pr.per.y or.state.

关键词： Magnetotellur.cs Seismic r.flection r.sistivity

Flow fr.ctional char.cter.stics of micr.encapsulated phase change mater.al suspensions flowing thr.ugh r.ctangular.minichannels

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2006年第4期49卷 445-456页

作者： Fr.nk Dammel Peter.stephan Chair.of Technical Ther.odynamics Darmstadt University of Technology Germany

An exper.mental investigation was conducted on the laminar.flow fr.ctional char.cter.stics of suspensions with micr.encapsulated phase change mater.al (MEPCM) in water.flowing thr.ugh r.ctangular.copper.minichannels. The MEPCM was pr.vided at an aver.ge par.icle size of 4.97 μm, and was mixed with distilled water.to for. suspen- sions with var.ous mass concentr.tions r.nging fr.m 0 to 20%. The exper.ment was per. for.ed to explor. the effect of MEPCM mass concentr.tion on fr.ction factor.and pr.ssur. dr.p in the minichannels. The r.ynolds number.r.nged fr.m 200 to 2000 to pr.vide laminar.and tr.nsitional flows. It was found that the exper.mental data for.the suspensions with 0 and 5% concentr.tion agr.e well with the existing theor.tical data for.an incom- pr.ssible, fully developed, laminar.Newtonian flow. For.the suspensions with mass con- centr.tions higher.than 10%, ther. is an obvious incr.ase in fr.ction factor.and pr.ssur. dr.p in compar.son with laminar.Newtonian flow.

关键词： micr.encapsulated phase change mater.al suspension, fr.ction factor. r.ctangular minichannel.

Land Monitor.ng Networ. Ser.ices based on inter.ational geospatial standar.s:SOSI and geoland2/SDI Pr.jects

在线全文

学校读者我要写书评

暂无评论

Inter.ational Jour.al of Digital Ear.h 2010年第S01期3卷 70-84页

作者： stephan Meissl Ger.ar. Tr.ebnig EOX IT Ser.ices GmbH Thurngasse 8/41090 WienAustria

Spatial Obser.ation Ser.ices and Infr.str.ctur. is a pr.ject to develop and ver.fy innovative infr.str.ctur. and ser.ices within the context of land monitor.ng and Ear.h Obser.ation initiatives at Eur.pean and Member.State(MS)*** pr.ject’s r.sults contr.bute to the concept definition of the Shar.d Envir.nmental Infor.ation System(SEIS)emphasising symmetr.cal online shar.ng of infor.ation as opposed to unidir.ctional *** a pr.-oper.tional set-up,involving the Eur.pean Envir.nment Agency(EEA),four.MS sites and the Eur.pean Space Agency(ESA),a decentr.lised infor.ation system r.specting the Infr.str.ctur. for.Spatial Infor.ation in Eur.pe(INSPIr.)pr.nciples is demonstr.ted integr.ting distr.buted data and pr.cessing ser.ices as well as inter.ctive multi-lingual *** geoland2 pr.ject is car.ied out in the context of Global Monitor.ng for.the Envir.nment and Secur.ty(GMES),a joint initiative of the Eur.pean Commission and ESA,aiming to build up a Eur.pean capacity for.*** Spatial Data Infr.str.ctur.(SDI)task shall set up oper.tional ser.ices for.the discover.,viewing,access and deliver. of all pr.ducts gener.ted in the geoland2 *** paper.pr.sents the pr.jects along the five Inter.ational Standar.s Or.anisation(ISO)/r.fer.nce Model of Open Distr.buted Pr.cessing viewpoints and concludes with the main r.commendation that ser.ice pr.visioning can str.ngly benefit fr.m a(r.-)utilisation of the Ser.ice Suppor. Envir.nment(SSE)technology pr.vided sustainably by ESA and fr.m the r.lated r.ch exper.ence.

关键词： geoland2 SOSI INSPIr. GMES envir.nment monitor.ng satellite Ear.h Obser.ation

Two-Phase Flow Patter.s and Heat Tr.nsfer.in Par.llel Micr.channels

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Jour.al of Ther.al Science 2002年第4期11卷 353-358页

作者： AlainDegiovanni Benjaminr.my stephanéAndr. Depar.ment of Mechanical Engineer.ng Technion- Israel Institute of TechnologyDepartment of Mechanical Engineering Technion- Israel Institute of TechnologyDepartment of Mechanical Engineering Technion- Israel Institute of Technology

Micr.Channel heat sinks with two-phase flow can satisfy the incr.asing heat r.moval r.quir.ments of moder. micr. electr.nic devices. One of the impor.ant aspects associated with two- phase flows in micr.channels is to study the bubble behavior. However. in the liter.tur. most of the r.por.s pr.sent data of only a single channel. This does not account for.flow mixing and hydr.dynamic instability that occur. in par.llel micr.channels, connected by common inlet and outlet collector.. In the pr.sent study, exper.ments wer. per.or.ed for.air. water.and steam- water.flow in par.llel tr.angular.micr.channels with a base of 200-300μ m. The exper.mental study is based on systematic measur.ments of temper.tur. and flow patter. by infr.r.d r.diometr. and high-speed digital video imaging. In air.water.flow, differ.nt flow patter.s wer. obser.ed simultaneously in the var.ous micr.channels at a fixed values of water.and gas flow r.tes. In steam-water.flow, instability in unifor.ly heated micr.channels was obser.ed.

关键词： two-phase flow heat tr.nsfer micr.channels dr.out.