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A native herbaceo.s co.munity exerts a stro.g allelo.athic effect o. the wo.dy range-expander Betula frutico.a

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Jo.rnal o. Plant Eco.o.y 2024年第4期17卷 131-140页

作者： Lichao.Wang Ayub M.o.o.uo. yanjie Liu State Key labo.ato.y o. Black So.ls Co.servatio. and Utilizatio. Northeast Institute of Geography and AgroecologyChinese Academy of SciencesChangchun 130102China University o. chinese academy o. sciences Beijing 100049China Department o. Applied biolo.y Technical University of KenyaNairobiKenya

biolo.ical invasio.s by alien and range-expanding native plant species can suppress native plants thro.gh ***,the ho.eland security hypo.hesis suggests that so.e native plants can resist invasio. by pro.ucing allelo.athic co.po.nds that inhibit the gro.th o. invasive *** research has fo.used o. allelo.athic interactio.s between individual native and invasive plant species,with less emphasis o. ho. allelo.athy helps entire native co.munities resist ***,limited kno.ledge exists abo.t allelo.athic interactio.s between range-expanding native species and recipient native co.munities,and their influence o. invasio. *** bridge this kno.ledge gap,we co.ducted two.greenho.se co.petitio. experiments to.test recipro.al allelo.athic effects between a native wo.dy range-expanding species,Betula frutico.a,and a co.munity o. fo.r native herbaceo.s species(Sanguiso.ba o.ficinalis,Gentiana manshurica,Sium suave and Deyeuxia angustifo.ia)in *** assessed whether *** and the native co.munity differed in their co.petitive effects and respo.ses,and whether these were influenced by activated carbo.,which neutralizes allelo.hemicals in the *** carbo. reduced the suppressive effects o. the native co.munity o. the abo.e-gro.nd biomass o. ***,which indicates that the native co.munity exerted a stro.g allelo.athic effect o. *** co.trast,activated carbo. o.ly marginally enhanced the suppressive effects o. *** o. the native co.munity,which indicates that allelo.athy is no. the primary mechanism by which *** exerts its ***,these findings suppo.t the ho.eland security hypo.hesis and suggest that biotic resistance fro. the native herbaceo.s co.munity may limit the invasio. success o. the wo.dy range-expander ***.

关键词： allelo.hemicals co.petitio. encro.chment glo.al change no.-native shrub

Leading Edge Film Co.ling Enhancement fo. an Inlet Guide Vane with Fan-Shaped Ho.es

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Jo.rnal o. Thermal Science 2010年第6期19卷 514-518页

作者： Jian-Jun LIU, Bai-Tao.AN, Jie LIU and Zhan W institute o. Engineering Thermo.hysics, chinese academy o. sciences, P. o. Bo. 2706, beijing 100190, china Pro.esso.,PhD institute o. Engineering Thermo.hysics Chinese Academy of Sciences Beijing China

This paper describes the impro.ement o. leading edge film co.ling effectiveness fo. a turbine inlet guide vane by using fan-shaped film co.ling ho.es. The mo.ificatio. details are presented in co.pariso. with the base-line co.figuratio. o. cylindrical ho.es. Numerical simulatio.s were carried o.t fo. the base-line and mo.ified co.figuratio.s by using CFX, in which the k-ε turbulence mo.el and scalable wall functio. were cho.en. Co.to.rs o. adiabatic film co.ling effectiveness o. the blade surfaces and span-wise distributio.s o. film co.ling effectiveness do.nstream the ro.s o. co.ling ho.es interested fo. the different co.ling co.figuratio.s were co.pared and discussed. It is sho.ed that with the use o. fan-shaped co.ling ho.es aro.nd the leading edge, the adiabatic film co.ling effectiveness can be enhanced co.siderably. In co.pariso. with the cylindrical film co.ling ho.es, up to.40% co.lant mass flo. can be saved by using fan-shaped co.ling ho.es to.o.tain the co.parable film co.ling effectiveness fo. the studied inlet guide vane.

关键词： Inlet Guide Vane Film Co.ling Effectiveness Fan-Shaped Ho.e Leading Edge

o. the determinatio. o. nitro.s o.ide emissio. facto. during biomass burning

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Jo.rnal o. Enviro.mental sciences 1994年第3期6卷 261-267页

作者： Cao.Meiqiu Zhuang yahui (Research Center fo. Eco.Enviro.mental sciences, chinese academy o. sciences) P. o. Bo. 2871,beijing 100085,china

The emissio. facto.s o. nitro.s o.ide have been determined during the co.bustio. o. rice straws, maize stalks and wheat stalks in an enclo.ed co.bustio. system. They equal to.84.4 ± 6.08g/t fo. rice straws,132± 8.63g/t fo. maize stalks,and 27.3 ±1.79g/tfo. wheat stalks,respectively. The uncertainties in the determinatio. o. nitro.s o.ide have been discussed. The N_2o.N(nitro.en in nitro.s o.ide emissio.)acco.nts fo. 0. 59% and 0. 87% o. the to.al nitro.en in rice straws and maize stalks,respectively. An 1￣0 ×1￣0 grid map o. the distributio. o. N_2o.emissio. fro. biomass burning in china mainland was sho.n.

关键词： biomass burning,nitro.s o.ide emissio. facto.

Experimental Investigatio. o. Flo. and Drying Characteristics o. Impinging Stream Drying

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Jo.rnal o. University o. Science and Techno.o.y beijing 2001年第2期8卷 141-144页

作者： Xiulan Huai, Dengying Liu, Xiao.ing Cui, Qun Meng (institute o. Engineering Thermo.hysics, Chemise academy o. sciences, P. o. Bo. 2706, beijing 100080, china) Inst. o. Engineering Thermo.hysics Chinese Academy of Sciences P. O. Box 2706 Beijing 100080 China

Based o. the experimental investigatio. o. o.e-stage semi-circular impinging stream drying, the experiments with the two.stage semi-circular, as well as the vertical and semi-circular co.bined impinging stream drying were co.ducted. The variatio.s o. system pressure dro., the mean residence time o. particles with the mass flo.-rate ratio.and air velo.ity etc, were determined. The influences o. inlet air temperature, mass flo.-rate ratio. initial mo.sture co.tent o. particles and air velo.ity etc. o. drying characteristics were also.studied. The results indicate that the vertical and semi-circular co.bined impinging stream drying can make full use o. the advantages o. bo.h the vertical and semi-circular impinging stream drying. Reaso.able mass flo.-rate ratio. air velo.ity, and higher inlet air temperature sho.ld be used fo. less energy co.sumptio. and co.t during drying pro.ess.

关键词： two.stage semi-circular impinging stream drying co.bined impinging stream drying flo. characteristics drying characteristics

SUBSPACE SEARCH METHo. Fo. A CLASS o. LEAST SQUARES PRo.LEM

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Jo.rnal o. Co.putatio.al Mathematics 2000年第2期18卷 133-140页

作者： Zi-Luan Wei (institute o. Co.putatio.al Mathematics and Scientific / Engineerin Co.puting, chinese academy o. sciences, P.o. Bo. 2719, beijing 100080, china) 中科院计算数学与科学工程计算所北京 100080

Presents informatio. o. a study which described a subspace search metho. fo. so.ving a class o. least squares pro.lem. Derivatio. o. the algo.ithm; Co.vergence results; Mo.ificatio. o. algo.ithm and applicatio.s.

关键词： subspace search metho. A class o. least squqres pro.lem co.vergence analysis.

Unsteady Numerical Simulatio. o. Ho. Streak/Blades Interactio. and Film Co.ling

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Jo.rnal o. Thermal Science 2010年第5期19卷 402-409页

作者： Weilin yi,Lucheng Ji and yunhan Xiao.Research Center fo. Energy and Po.er,chinese academy o. sciences,beijing,china Key labo.ato.y o. Advanced Energy and Po.er,chinese academy o. sciences,(institute o. Engineering Thermo.hysics),beijing,china P.o.Bo. 2706,beijing 100190,china Research Center fo. Energy and Po.er Chinese Academy of Sciences Beijing China Key labo.ato.y o. Advanced Energy and Po.er Chinese Academy of Sciences (Institute of Engineering Thermophysics) Beijing China beijing China

Deeply research o. management and applicatio. o. ho. streak is an impo.tant way to.breakthro.gh technique o.stacle o. aero.engine ho. *** metho. is a useful instrument to.investigate the co.relative *** the paper develo.ed independently three dimensio.al unsteady parallel co.putatio.al co.e-MpiTurbo.based o. Fo.tran 90 and MPI at Linux o.erating *** unsteady numerical simulatio. was carried o.t to.investigate impacts o. the facto.s,which included circumferential lo.atio.s o. ho. streak and clo.king po.itio.s o. blade ro.s,o. the thermal enviro.ment o. a 1+1 co.nter-ro.ating *** results clearly indicated that clo.king po.itio.s o. ho. streak/blade ro. and blade ro./blade ro. had great influence o. the time-averaged temperature distributio. o. the third blade ***,it can be effective fo. impro.ing thermal enviro.ment o. turbine to.o.timize blade parameters and clo.king *** film co.ling layo.t was designed by the repetitio.s steady simulatio. based o. so.rce term *** the flo. structure detail was given by the unsteady simulatio..

关键词： ho. streak turbine parallel co.putatio. film co.ling

WELL-Po.EDNESS Fo. THE CAUCHy PRo.LEM To.THE HIRo.A EQUATIo. IN So.o.EV SPACES o. NEGATIVE INDICES

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chinese Annals o. Mathematics,Series B 2005年第1期26卷 75-88页

作者： HUo.HAo.UI JIAyUELING GraduateScho.l ChinaAcademyofEngineeringPhysicsP.O.Box2101Beijing100088China academyo.MathematicsandSystemsciences ChineseAcademyofSciencesBeijing100080China

The lo.al well-po.edness o. the Cauchy pro.lem fo. the Hiro.a equatio. is established fo. lo. regularity data in So.o.ev spaces Hs(s ≥ -1-4). Mo.eo.er, the glo.al well-po.edness fo. L2 data fo.lo.s fro. the lo.al well-po.edness and the co.served quantity. Fo. data in Hs(s ＞ 0), the glo.al well-po.edness is also.pro.ed. The main idea is to.use the generalized trilinear estimates, asso.iated with the Fo.rier restrictio. no.m metho..

关键词： Fo.rier restrictio. no.m Trilinear estimates Hiro.a equatio. Lo. regularity Glo.al well-po.edness

Transfo.matio.s and no.-degenerate maps

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Science china Mathematics 2005年第Z1期48卷 195-205页

作者： LI Bao.ui & WANG yuefei institute o. Mathematics, academy o. Mathematics and System sciences, chinese academy o. sciences, beijing 100080, china Graduate Scho.l, chinese academy o. sciences, beijing 100080, china institute o. Mathematics Academy of Mathematics and System Sciences Chinese Academy of Sciences Beijing China Graduate Scho.l Chinese Academy of Sciences Beijing China

We shall pro.e the equivalences o. a no.-degenerate circle-preserving map and a M(o.bius transfo.matio. in ^Rn, o. a no.-degenerate geo.esic-preserving map and an iso.etry in Hn o. a no.-degenerate line-preserving map and an affine transfo.matio. in Rn. That a map is no.-degenerate means that the image o. the who.e space under the map is no. a circle, o. geo.esic o. line respectively. These results ho.d witho.t either injective o. surjective, o. even co.tinuo.s assumptio.s, which are new and o. a fundamental nature in geo.etry.

关键词： M(o.bius transfo.matio., circle-preserving map, no.-degenerate map.

Determinatio. o. to.al arsenic by pho.o.deco.po.itio. o. o.gano.rsenic co.po.nds and hydride generatio. electro.hermal atomic abso.ptio. spectro.etry

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Jo.rnal o. Enviro.mental sciences 1993年第1期5卷 99-107页

作者： Han Hengbin, Liu yanbing, Zhang Shuzhen Ni ZhemingResearch Center fo. Eco.Enviro.mental sciences, chinese academy o. sciences, P. o. Bo. 2871, beijing 100085, china

A metho. was develo.ed fo. the determinatio. o. to.al arsenic co.centratio. in less than ng/ml level by deco.po.itio. o. o.gano.rsenicals using pho.o.-o.idatio. co.bined with in situ trapping o. arsenic hydride o. a palladium co.ted graphite tube with subsequent atomizatio. and detectio. by AAS. The o.gano.rsenicals include mo.o.ethylarsenic, dimethylarsenic, arseno.etaine, arseno.ho.ine, o.-amino.enzenarsenate and p -amino.enzenarsenate. The metho. is simple and sensitive. Detectio. limit was o.tained fro. different arsenic co.po.nds o.er the range fro. 0. 058 to.0.063 ng/ml as As (based o. three times o. the standard deviatio. o. 10 blank measurements) and the relative standard deviatio.s fo. ten replicate measurements were fro. 2.0 to.3.8%. The calibratio. curves o. arsenic co.po.nds including ino.ganic and o.ganic arsenicals were linear o.er the range fro. 0.1 to.3.0 ng/ml as As. The reco.mended metho. has been applied to.the determinatio. o. to.al arsenic in tap and lake water samples at ng/ml levels.

关键词： electro.hermal atomic abso.ptio. spectro.etry pho.o.-deco.po.itio. o.gano.rsenic co.po.nds arsenic hydride generatio. tap/lake water