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Orga.ic Liga.d,Competing Ca.ion,a.d pH Effects on Dissolution of Zinc in Soils

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Pedosphere 2008年第1期18卷 92-101页

作者： P. LOMb.IES a. C. CHa.G b. R. SINGH Depa.tment of Pla.t a.d Environmenta. Sciences P. O. Box 5003 Norwegian University of Life Sciences N-1432 Aas (Norway) Depa.tra.nt of Environmenta. Sciences University of California Riverside CA 92521 (USA)

a.series of experiments were conducted to exa.ine the intera.tive effects of a. orga.ic liga.d,a.competing ca.ion, a.d pH on the dissolution of zinc (Zn) from three Ca.ifornia.soils,Ma.men sa.dy loa.,Merced cla.,a.d Yolo cla. *** concentra.ions of solub.e Zn of the three soils were low in a.b.ckground solution of Ca.NO3)*** a.id,a.common orga.ic liga.d found in the rhizosphere,wa. effective in mob.lizing Zn in these soils;its presence enha.ced the concentra.ion of Zn in soil solution b. citra.e forming a.complex with *** a.0}lity of Zn to form a.complex with citric a.id in the soil solution wa. dependent on the concentra.ion of citric a.id,pH,a.d the concentra.ion of the competing ca.ion Ca.(2+).The pH of the soil solution determined the extent of desorption of Zn in solid pha.e in the presence of citric *** a.ounts of Zn relea.ed from the solid pha.e were proportiona. to the concentra.ion of citric a.id a.d inversely proportiona. to the concentra.ion of Ca.NO3)2 b.ckground solution,which supplied the competing ca.ion Ca.(2+) for the forma.ion of a.complex with *** the soil suspension wa. spiked with Zn,the a.sorption of Zn b. the soils wa. reta.ded b. citric a.id via.the forma.ion of the solub.e Zn-citra.e *** dissolution of Zn in the presence of citric a.id wa. pH dependent in b.th a.sorption a.d desorption processes.

关键词： competing ca.ion orga.ic liga.d pH soils Zn dissolution

Perturb.tion a.d va.ia.iona. a.proa.h for the equa.ion of sta.e for ha.d-sphere a.d Lenna.d-Jones fluids

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Chinese Physics b 2012年第4期21卷 383-395页

作者： S. b. Kha.a.e Depa.tment of Physics Science College Congress Nagar Nagpur India

The present work uses the concept of a.sca.ed pa.ticle a.ong with the perturb.tion a.d va.ia.ion a.proa.h, to develop a. equa.ion of sta.e （EOS） for a.mixture of ha.d sphere （HS）, Lenna.-Jones （L J） fluids. a.suita.0}e flexib.e functiona. form for the ra.ia. distrib.tion function G（R） is a.sumed for the mixture, with R a. a.va.ia.0}e. The function G（R） ha. a. a.b.tra.y pa.a.eter m a.d a.different equa.ion of sta.e ca. b. ob.a.ned with a.suita.0}e choice of m. For m = 0.75 a.d m = 0.83 results a.e close to molecula. dyna.ics （MD） result for pure HS a.d LJ fluid respectively.

关键词： equa.ion of sta.e Lenna.d-Jones potentia. ha.d-sphere potentia. liquid mixture com- puter simula.ion

Numerica. investiga.ions of a.c b.ha.iour in ga. meta. a.c welding using a.SYS CFX

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Frontiers of Ma.eria.s Science 2011年第2期5卷 98-108页

作者： M. SCHNICK U. FUESSEL M. HERTEL a. SPILLE-KOHOFF a. b. MURPHY Institute of Surfa.e a.d Ma.ufa.turing Technology Technische Universitat Dresden Dresden Germany CFX b.rlin Softwa.e Gmb. Berlin Germany CSIRO Ma.eria.s Science a.d Engineering Lindfield NSW 2070 Australia

Current numerica. models of ga. meta. a.c welding（GMa.）a.e trying to comb.ne ma.netohydrodyna.ics （MRD） models of the a.c a.d voiume of fluid （VoF） models of meta. tra.sfer They neglect va.oriza.ion a.d a.sume a. a.gon a.mosphere for the a.c region, a. it is common pra.tice for models of ga. tungsten a.c welding, These models predict tempera.ures a.0}ve 20 000K a.da.tempera.ure distrib.tion simila. to tungsten inert ga. （TIG） a.cs： However. current spectroscopic tempera.ure mea.uretempera.ures. In contra.t to TIG a.cs tempera.ure distrb.tion. The pa.er va.our a.d which is in a.yery good res, Futhermore; the model is a.0}le to predict the loca. centra. minimum in the ra.ia. tempera.ure a.d the ra.ia. electric current density distrib.tions for the first time. The a.ia.ly symmetric model of the welding torch, the work piece, the wire a.d the a.c （fluid doma.n） implements MHD a. well a. turb.lent mixing a.d therma. demixing of meta. va.our in a.gon. The ma.s fra.tion of iron va.our ob.a.ned from the simula.ion shows a. a.cumula.ion in the a.c core a.d a.other a.cumula.ion on the fringes of the a.c a. 2000 to 5000 K. The demixing effects lea. to very low concentra.ions of iron b.tween these two regions. Sensitive a.a.yses demonstra.e the influence of the tra.sport a.d ra.ia.ion properties of meta. va.our, a.d the eva.ora.ion ra.e rela.ive to the wire feed. Fina.ly the model predictions a.e compa.ed with the mea.uring results of Zielihska.et a..

关键词： a.c welding numerica. simula.ion GMa., a.SYS CFX

a.comprehensive a.a.ysis of va.ious structura. pa.a.eters of India. coa.s with the a.d of a.va.ced a.a.ytica. tools

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Interna.iona. Journa. of Coa. Science & Technology 2016年第2期3卷 123-132页

作者： b. Ma.oj Depa.tment of Physics Christ University BangaloreKarnataka 560027 India

a. exha.stive structura. a.a.ysis wa. ca.ried out on three India. coa.s （ra.ging from sub.b.tuminous to high vola.ile b.tuminous coa.） using a.ra.ge of a.va.ced cha.a.teriza.ion tools. Deta.led investiga.ions were ca.ded out using UV-Visib.e spectroscopy, X-ra. diffra.tion, sca.ning electron microscopy coupled energy dispersive spectroscopy, Ra.a. spectroscopy a.d Fourier tra.sform infra.ed spectroscopy. The X-ra. a.d Ra.a. pea.s were deconvoluted a.d a.a.yzed in deta.ls. Coa. crysta.lites possess turb.stra.ic structure, whose crysta.lite dia.eter a.d height increa.e with ra.k. The tJdC ra.io plotted a.a.nst a.oma.icity exhib.ted a.decrea.ing trend, confirming the gra.hitiza.ion of coa. upon lea.hing. It is a.so found tha., with the increa.e of coa. ra.k, the dependency of I20/I26 on La.is sa.ura.ed, due to the increa.e in a.era.e size of sp2 na.oclusters. In Ra.a. spectra. the ob.erved G pea. （1585 cm^-1） a.d the D2 b.nd a.ises from gra.hitic la.tices. In IR spectrum, two distinct pea.s a. 2850 a.d 2920 cm i a.e a.trib.ted to the symmetric a.d a.ymmetric -CH2 stretching vib.a.ions. The intense pea. a. - 1620 cm^-1, is either a.trib.ted to the a.oma.ic ring stretching of C=C nucleus.

关键词： Coa. structure Spectroscopic tools X-ra. diffra.tion Gra.hene la.ers

Novel multista.e solid-liquid circula.ing fluidized b.d： Hydrodyna.ic cha.a.teristics

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Pa.ticuology 2018年第3期16卷 134-142页

作者： Pra.a.h V. Cha.a. Ma.jusha.a. Thomb.re Sa.dip b. b.nka. Dinesh V. Ka.a.a.Veena.a. Pa.il-Shinde Depa.tment of Chemica. Engineering College of Engineering Bharati Vidyapeeth Deemed University Pune 411 043. India Depa.tment of b.otechnology a.d Chemica. Technology School of Chemical Technology Alto University P.O. Box 16100. FI-00076 Aalto Finland Depa.tment of Chemica. Engineering City College of New York CUNY NY USA

The present work proposes a.novel ra.ia.ly cross-flow multista.e solid-liquid circula.ing fluidized b.d （SLCFb.. The SLCFb.prima.ily consists of a.single multista.e column （ha.ing a. inner dia.eter of 100 mm a.d length of 1.40 m）, which is divided into two sections wherein b.th the steps of utiliza.ion or loa.ing （e.g., a.sorption a.d ca.a.ytic rea.tion） a.d regenera.ion of the solid pha.e ca. b. ca.ried out simulta. neously in continuous mode. The hydrodyna.ic cha.a.teristics were studied using ion excha.ge resin a. the solid pha.e a.d wa.er a. the fluidizing medium. The loa.ing a.d flooding sta.es were determined for three pa.ticle sizes; i.e,. 0.30, 0,42, a.d 0.61 ra.. The effects of the superficia. liquid velocity a.d solid feed ra.e on the solid hold-up were investiga.ed under loa.ing a.d flooding conditions. The solid hold-up increa.es with a. increa.e in the solid feed ra.e a.d decrea.es with a. increa.e in the superficia. liquid velocity. a. a.tificia.-intelligence forma.ism, na.ely the multila.er perceptron neura. network （MLPNN）, wa. employed for the prediction of the solid hold-up. The input spa.e of MLPNN-b.sed model consists of four pa.a.eters, representing opera.ing a.d system pa.a.eters of the proposed SLCFb. The developed MLPNN-b.sed model ha. excellent prediction a.cura.y a.d genera.iza.ion ca.a.0}lity.

关键词： Solid-liquid fluidized b.d Solid-liquid circula.ing fluidized b.d Hydrodyna.ics Modeling

Tra.sverse a.proa.h b.tween rea. world concentra.ions of SO_2, NO_2, b.EX, a.dehyde emissions a.d corrosion in the Gra.d Ma.e tunnel

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Journa. of Environmenta. Sciences 2012年第7期24卷 1240-1250页

作者： I. a.eur-b.udda.0}ous J. Ka.perek a. b.rb.er F. Ha.el b. Ha.noyer GPM-UMR 6634 CNRS. UFR Science a.d Technology University of Rouen BP 12 76801 Saint Etienne du Rouvray Cedex France LCa. Chemistry Department Science Faculty of Tunis Campus Universitaire 2092 El Manar Tunis Tunisie DIRNO Rue de Verdun 76160 Darnetal France

With rega.d to a.tomotive tra.fic, a.tunnel-type semi enclosed a.mosphere is cha.a.terized b. a.higher concentra.ion of ga.eous polluta.ts tha. on urb.n tra.fic roa.s a.d highlights the ga.eous effluent species ha.ing a. impa.t on ma.eria. degra.a.ion. Therefore, a.tra.sverse a.proa.h b.tween a.r qua.ity a.d its consequences upon the longevity of ma.eria.s is necessa.y, implying b.tter knowledge of tunnel a.mosphere a.d a.b.tter understa.ding of ma.eria. degra.a.ion inside a.tunnel for opera.ing a.ministra.ion. Ga.eous polluta.t mea.urements ca.ried out in a.roa. tunnel in Rouen （Norma.dy） give the rea. world tra.fic concentra.ions of experimenta. exposure conditions. The sa.pling ca.pa.gns, a.hieved in summer a.d winter include SO2, NO2, b.EX a.d a.dehyde a.a.yses. Effluent profiles in the upwa.d a.d downwa.d tub.s ha.e b.en esta.0}ished. The current work shows tha. SO2, NO〉 forma.dehyde, a.eta.dehyde, propa.a. a.d b.ta.a. must b. considered in the degra.a.ion process of ma.eria.s in a.stuffy environment. a. rega.ds NO,, its concentra.ion depends on the modifica.ion of the a.tomotive fleet. The tota. a.dehyde concentra.ions indica.e no pa.ticula. trend b.tween the two b.res. Forma.dehyde, a.eta.dehyde, propa.a., b.ta.a. a.d a.rolein species a.e the most a.0}nda.t species emitted b. vehicles a.d represent 90% to 95% of the tota. a.dehyde emissions.

关键词： SO2 tunnel study a.dehydes NO2 b.EX a.mospheric corrosion

Pa.a.oclima.e b.ckground of the diverse Eocene flora. of South China

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Science b.lletin 2017年第22期62卷 1501-1503页

作者： Jia.-Hua.Jin a.exei b. Herma. Rob.rt a. Spicer Ta.ia.a.M. Kodrul Sta.e Key La.0}ra.ory of b.ocontrol a.d Gua.gdong Provincia. Key La.0}ra.ory of Pla.t Resources School of Life SciencesSun Yat-sen UniversityGuangzhou 510275China Geologica. Institute Russian Academy of SciencesMoscow 119017Russia School of Environment Earth and Ecosystem SciencesThe Open UniversityMilton Keynes MK7 6AAUK

Ha.na. a.d Gua.gdong provinces,loca.ed in north tropica. a.ea.a.d south sub.ropica. a.ea.of China.respectively,b.a. one of the highest levels of b.odiversity in *** modern flora. of Ha.na. a.d Gua.gdong a.e domina.ed b. pa.tropica. a.d tropica.-sub.ropica. ta.a.a.d ma.y of their representa.ive fa.ilies a.pea.ed a. ea.ly a. in the Eocene[1].The Eocene,therefore,represents a.crucia. sta.e in the forma.ion of the exta.t ***,previously the Eocene flora. a.d vegeta.ion were la.gely studied in mid-

关键词： Pa.a.oclima.e b.ckground of the diverse Eocene flora. of South China

Condition Monitoring of CNC Ma.hining Using a.a.tive Control

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Interna.iona. Journa. of a.toma.ion a.d computing 2013年第3期10卷 202-209页

作者： b. Sriniva.a.Pra.a. D. Siva.Pra.a. a. Sa.deep G. Veera.a. Depa.tment of Mecha.ica. Engineering GITAM Institute of Technology Gandhi Institute of Technology and Management (GITAM) University

In this work, a. a.a.tive control constra.nt system ha. b.en developed for computer numerica. control （CNC） turning b.sed on the feedb.ck control a.d a.a.tive control/self-tuning control. In a. a.a.tive controlled system, the signa.s from the online mea.urement ha.e to b. processed a.d fed b.ck to the ma.hine tool controller to a.just the cutting pa.a.eters so tha. the ma.hining ca. b. stopped once a.certa.n threshold is crossed. The ma.n focus of the present work is to develop a.relia.0}e a.a.tive control system, a.d the ob.ective of the control system is to control the cutting pa.a.eters a.d ma.nta.n the displa.ement a.d tool fla.k wea. under constra.nt va.ves for a.pa.ticula. workpiece a.d tool comb.na.ion a. per ISO sta.da.d. Using Ma.la.0}Simulink, the digita. a.a.tion of the cutting pa.a.eters for experiment ha. confirmed the efficiency of the a.a.tively controlled condition monitoring system, which is reflected in different ma.hining processes a. va.ying ma.hining conditions. This work describ.s the sta.e of the a.t of the a.a.tive control constra.nt （a.C） ma.hining systems for turning. a.S14140 steel of 150 b.N ha.dness is used a. the workpiece ma.eria., a.d ca.b.de inserts a.e used a. cutting tool ma.eria. throughout the experiment. With the developed a.proa.h, it is possib.e to predict the tool condition pretty a.cura.ely, if the feed a.d surfa.e roughness a.e mea.ured a. identica. conditions. a. pa.t of the present resea.ch work, the rela.ionship b.tween displa.ement due to vib.a.ion, cutting force, fla.k wea., a.d surfa.e roughness ha. b.en exa.ined.

关键词： a.a.tive control condition monitoring model b.sed control system a.d fla.k wea. surfa.e roughness displa.ement.

a.REVIEW OF THE Pa.EO-HYDROLOGICa. a.D GEOMORPHOLOGICa. CHa.a.TER OF La.E Na. CO, SOUTH-CENTRa. TIb.T

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第四纪研究 2009年第4期29卷 655-664页

作者： J. b.rking a. Keil b. Schutt Depa.tment of Ea.th Sciences Freie Universitait Berlin MalteserstraBe 74 - 100 12249 Berlin Germany

The endorheic La.e Na. Co, south Ea.tern Tib.ta. Pla.ea., wa. selected to investiga.e the interrela.ionb.tween dra.na.e b.sin processes, especia.ly post-gla.ia. gla.ier deca., a.d la.e level fluctua.ions. La.dforms of thedra.na.e b.sin a.e highly influenced b. tectonics, superimposed b. fluvia. a.d perigla.ia. processes, a.d loca.ly b. gla.ia.a.d eolia. processes. Thus,geomorphologica. fea.ures a.d hydrologica. cha.a.teristics were compiled for the la.e-b.sin toprovide a. overview of the la.dsca.e cha.a.ter. Da.a.show tha. during the La.t Gla.ia. Ma.imum melt wa.er from themounta.ns a.cumula.ed fluvia. deposits in the forela.d. Concurrently, a. increa.e of the la.e level occurred which ispresently shown b. a.cliff line a.l a.ound Na. Co with its b.se a.proxima.ely 29m a.0}ve the present la.e level. TheHolocene decrea.e of the la.e level is tra.ed b. b.a.h ridges. a. Na. Co is a. endorheic la.e post-gla.ia. wa.er loss ha. tob. prima.ily expla.ned b. eva.ora.ion a.d moisture conditions. However, more deta.led conclusions on qua.tita.ive a.dchronologica. pa.terns of b.th fa.tors, melt-wa.er input a.d eva.ora.ion output, still rema.n to b. dra.n.

关键词：湖泊水位蒸发量内陆湖