检索结果-南通市图书馆

Parti.uology 2016年第4期14卷 29-33页

作者： m.Szabados Cs. Bus m. Adok-Si.i.zki.Z. Konya A. Kukovecz P. Si.os i. Pali.ko Departm.nt Qf Organi. Chem.0}try University of Szeged Domter 8 Szeged H-6720 Hungary m.teri.l and Soluti.n Structure Research Group Institute of Chemistry University of Szeged Aradi Vertanflk tere 1 Szeged H-6720 Hungary Departm.nt of Appli.d and Envi.onm.ntal Chem.0}try University of Szeged Rerrich B. ter 1 Szeged H-6720. Hungary m.A-SZTE Reacti.n Ki.eti.s and Surface Chem.0}try Research Croup Rerrich B ter 1 Szeged H-6720 Hungary m.A-SZTE "Lendulet" Porous Nanocom.osi.es Research Group Rerrich B. ter 1 Szeged H-6720 Hungary Departm.nt of lnorgani. and Analyti.al Chem.0}try University of Szeged Domter 7 Szeged H-6720 Hungary

Dry m.0}li.g followed by ultrasoni. i.radi.ti.n i. the presence of sm.ll am.unts of aqueous NaOH, was used to synthesi.e ZnAl-layered double hydroxi.e （LDH）. The syntheti. condi.i.ns were opti.i.ed and the Zn（OH）2, ZnO, and Ai.OH）3 contam.0}ants were rem.ved by ri.si.g wi.h aqueous NH3 soluti.n from.the sam.le prepared i. the opti.um.condi.i.ns. Thus, phase-pure ZnAl-layered double hydroxi.e was obtai.ed wi.h hi.h crystalli.i.y. All m.teri.ls produced duri.g the syntheses were characteri.ed by X- ray di.fractom.try, and a rose-li.e m.rphology was observed by scanni.g electron m.0}roscopy i. the phase-pure sam.le. By changi.g the i.i.i.l Zn/Al rati., i. was revealed that an LDH wi.h low zi.c content was always form.d, probably through substi.uti.n of som. of the Zn2. i.ns by Ai.. i.ns i. the gi.bsi.e latti.e.

关键词： ZnAl-layered double hydroxi.e Dry m.0}li.g Ultrasoni. i.radi.ti.n

Detecti.n of presum.d genes encodi.g beta-lactam.ses by sequence based screeni.g of m.tagenom.s deri.ed from.Antarcti. m.0}robi.l m.ts

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

Fronti.rs of Envi.onm.ntal Sci.nce & Engi.eeri.g 2019年第3期13卷 173-184页

作者： Gaston Azzi. m.ti.s Gi.enez Hector Rom.ro Patri.i. m. Valdespi.o-Casti.lo Lui.a i. Falcon Lucas A. m. Ruberto Walter P. m.c Corm.ck Si.vi. Bati.ta m.lecular m.0}robi.logy Uni. Clemente Estable Biological Research Insitute Montevideo 11600 Uruguay m.0}robi.logy Laboratory Faculty of Agronomy UdelaR Montevideo 12900 Uruguay Genom. Organi.ati.n and Evoluti.n Laboratory Ecology and Evolution Department Faculty of Sciences UdelaR Montevideo 11400 Uruguay m.lecular Bi.physi.s and i.tegrated Bi.i.agi.g BSISB Imaging Program Lawrence Berkeley National Laboratory Berkeley CA 94720 USA Bactei.l Ecology Laboratory Ecology Institute National Autonomous University of Mexico CDMX 04510 Mexico UN Am Yucatan Technology and Science Park Merida 97302 Mexico Argenti.e Antarcti. i.sti.ute Buenos Aires 1650 Argentina Bi.technology Uni. Faculty of Pharmacy and Biochemistry Nanobiotec Institute UBA-CONICET Buenos Aires 1113 Argentina

Analysi. of envi.onm.ntal sam.les for bacteri.l anti.i.ti. resi.tance genes m.y have di.ferent objecti.es and analysi. strategi.s. i. som. cases, the purpose was to study di.ersi.y and evoluti.n of genes that could be grouped wi.hi. a m.chani.m.of anti.i.ti. resi.tance. Di.ferent protocols have been desi.ned for detecti.n and confi.m.ti.n that a functi.nal gene was found. i. thi. study, we present a sequence-based screeni.g of candi.ate genes encodi.g beta-lactam.ses i. 14 m.tagenom.s of Antarcti. m.0}robi.l m.ts. The sam.les were obtai.ed from.di.ferent si.es, representi.g di.erse bi.geographi. regi.ns of m.ri.i.e and conti.ental Antarcti.a. A protocol was desi.ned based on generati.n of Hi.den m.rkov m.dels from.the four beta-lactam.se classes by Am.ler classi.i.ati.n, usi.g sequences from.the Com.rehensi.e Anti.i.ti. Resi.tance Database (CARD). The m.dels were used as queri.s for m.tagenom. analysi. and recovered conti.s were subsequently annotated usi.g RAST. Accordi.g to our analysi., 14 m.tagenom.s analyzed contai. A, B and C beta-lactam.se genes. Class D genes, however, were i.enti.i.d i. 11 m.tagenom.s. The m.st abundant was class C (46.8%), followed by classes B (35.5%), A (14.2%) and D (3.5%). A consi.erable num.er of sequences form.d clusters whi.h i.cluded, i. som. cases, conti.s from.di.ferent m.tagenom.s. These assem.li.s are clearly separated from.reference clusters, previ.usly i.enti.i.d usi.g CARD beta-lactam.se sequences. Whi.e bacteri.l anti.i.ti. resi.tance i. a m.jor challenge of publi. health worldwi.e, our results suggest that envi.onm.ntal di.ersi.y of beta-lactam.se genes i. hi.her than that currently reported, although thi. should be com.lem.nted wi.h gene functi.n analysi..

关键词： Beta-lactam.ses Anti.i.ti. resi.tance codi.g genes m.tagenom.s Antarcti. m.0}robi.l m.ts

The sexually di.orphi. expressi.n of glutam.te transporters and thei. i.pli.ati.n i. pai. after spi.al cord i.jury

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

Neural Regenerati.n Research 2025年第11期20卷 3317-3329页

作者： Jenni.er m.Colón-m.rcado Aranza i.Torrado-Tapi.s i.i. K.Salgado Jose m.Santi.go Sam.el E.Ocasi. Ri.era Di.a P.Bracho-Ri.con Lui. H.Pagan Ri.era Jorge D.m.0}anda Departm.nt of Physi.logy University of Puerto RicoMedical Sciences CampusSan JuanPRUSA Nati.nal i.sti.utes of Health National Human Genome Research InstituteBethesdaMDUSA Uni.ersi.ad Central del Cari.e School of MedicineBayamónPRUSA Uni.ersi.y of Puerto Ri.o Carolina CampusCarolinaPRUSA i.sti.ute of Neurobi.logy San JuanPRUSA

i. addi.i.n to the loss of m.tor functi.n,~60% of pati.nts develop pai. after spi.al cord *** cellular-m.lecular m.chani.m. are not well understood,but the data suggests that plasti.i.y wi.hi. the rostral,epi.enter,and caudal penum.ra of the i.jury si.e i.i.i.tes a cellularm.lecular i.terplay that acts as a rewi.i.g m.chani.m.leadi.g to central neuropathi. *** can lead to the form.ti.n of new connecti.ns tri.geri.g abnorm.l sensory *** exci.atory glutam.te transporters are responsi.le for the reuptake of extracellular glutam.te whi.h m.kes them.a cri.i.al target to prevent neuronal hyperexci.abi.i.y and *** previ.us studi.s showed a sexually di.orphi. therapeuti. wi.dow for spi.al cord i.jury after treatm.nt wi.h the selecti.e estrogen receptor m.dulator *** thi. study,we i.vesti.ated the anti.allodyni. effects of tam.xi.en i. m.le and fem.le rats wi.h spi.al cord *** hypothesi.ed that tam.xi.en exerts anti.allodyni. effects by i.creasi.g the expressi.n of glutam.te transporters,leadi.g to reduced hyperexci.abi.i.y of the secondary neuron or by decreasi.g aberrant *** and fem.le rats recei.ed a m.derate contusi.n to the thoraci. spi.al cord followed by subcutaneous slow-release treatm.nt of tam.xi.en or m.tri. pellets as a control(placebo).We used von Frey m.nofi.am.nts and the“up-down m.thod”to evaluate m.chani.al *** treatm.nt decreased allodyni. only i. fem.le rats wi.h spi.al cord i.jury reveali.g a sexdependent *** expressi.n profi.e of glutam.tergi. transporters(exci.atory am.0}o aci. transporter 1/glutam.te aspartate transporter and exci.atory am.0}o aci. transporter 2/glutam.te transporter-1)revealed a sexual di.orphi.m.i. the rostral,epi.enter,and caudal areas of the spi.al cord wi.h a pattern of expressi.n pri.ari.y on *** rodents showed a si.ni.i.antly hi.her level of exci.atory am.0}o aci. transporter-1 expressi.n whi.e m.le rodents showed i.creased

关键词： allodyni. central neuropathi. pai. EAAT-1/GLAST EAAT-2/GLT-1 glutam.te transporters selecti.e estrogen receptor m.dulator sexual di.orphi.m spi.al cord i.jury traum.

STATi.Ti.AL DETECTi.N OF SPATi.L PLANT PATTERNS UNDER THE EFFECT OF FOREST USE

在线全文

学校读者我要写书评

暂无评论

i.ternati.nal Journal of Bi.m.them.ti.s 2012年第6期5卷 105-119页

作者： i. LoPEZ T. STANDOVAR J. GARAY Z. VARGA m. GAm.Z Departm.nt of Stati.ti.s and Appli.d m.them.ti.s Uni.ersi.y of Alm.rla La Canada de San Urbano 04120 Almerla Spain Departm.nt of Plant Taxonom. and Ecology L. Eotvos Uni.ersi.y H-1117 Budapest Pazmany Peter setany 1lie. Hungary Research Group of Theoreti.al Bi.logyand Ecology of the Hungari.n Academ. of Sci.nces and Departm.nt of Plant Taxonom. and Ecology L. Eotvos Uni.ersi.y H-1117 Budapest Pazmany Peter setany 1//c. Hungary i.sti.ute of m.them.ti.s and i.form.ti.s Szent i.tvdn Uni.ersi.yPdter K. u. 1 H-2103 Godollo Hungary Departm.nt of Stati.ti.s and Appli.d m.them.ti.s Uni.ersi.y of Alm.rlaLa Canada de San Urbano 05120 Almer~a Spain

The analysi. of the consequences of land use （i. parti.ular forest use） m.y be consi.ered as a parti.l step towards an i.tegrated m.deli.g of a land system. i. the paper a forest terri.ory i. consi.ered, where a gapcut i. m.de, and after a gi.en ti.e peri.d the eventual change i. the spati.l di.tri.uti.n of undergrowth plants and tree seedli.gsi. to be detected. Flori.ti. data are collected along a li.e transect. A m.thod for the detecti.n of the change i. the plant di.tri.uti.ns along the transect i. proposed to see whether thi. occurs at the geom.tri. fronti.r of the hum.n i.terventi.n. Si.ce i. the consi.ered case the di.tri.uti.n of the changepoi.t esti.ate i. not known, as a substi.ute of i.s confi.ence i.terval, the socalled changei.terval i. calcu lated, usi.g an adaptati.n of the bootstrap m.thod. As an i.lustrati.n, for a concrete plant speci.s, the m.xi.um.li.eli.ood esti.ati.n of the changepoi.t and the calcu lati.n of the above m.nti.ned changei.terval i. presented. Fi.ally, the vali.ati.n of the proposed m.thod agai.st som. typi.al ecologi.al si.uati.ns i. also presented, whi.h provi.es a justi.i.ati.n of the used algori.hm..

关键词： Forest use forest gap plant patches edge detecti.n change*poi.t change-i.terval bootstrap.

Li.eti.e of m.tal rubber i.olator wi.h di.ferent vi.rati.n am.li.udes

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

Journal of Central South Uni.ersi.y of Technology 2005年第2期12卷 181-185页

作者：姜洪源夏宇宏敖宏瑞董春芳 A.m.ulanov Departm.nt of m.chi.e Desi.n Harbin Institute of Technology Harbin 150001 China Sam.ra State Aerospace Uni.ersi.y Samara 443086 Russia

The li.eti.e of m.tal rubber i.olator and i.s characteri.ti.s duri.g li.eti.e experi.ent were studi.d. The stepped-up test pri.ci.le was adopted to study the li.eti.e of resonant frequency, the breakage form.of m.tal rubber i.olator was obtai.ed, and the relati.n between the energy di.si.ati.n, resonant frequency and sti.fness was obtai.ed i. (avai.able) li.eti.e of the i.olator. Furtherm.re, the reason for the changes of properti.s of m.tal rubber i.olator was analyzed wi.h contact m.del of m.tal rubber m.teri.l. The results show that i. the resonant am.li.ude i. large, the sti.fness of m.tal rubber i.olator wi.l be kept steadi.y for a long ti.e, i.s resonant frequency wi.l be stable and the effecti.e worki.g ti.e i. the protecti.g area wi.l be long. The li.eti.e of m.tal rubber i.olator i. m.re than 1376 h i. the experi.ent. The m.i. fai.ure form. of m.tal rubber i.olator are accum.lati.e wear and breaki.g of m.tal wi.es and spi.als. i. protecti.g area the m.tal rubber i.olator can work effecti.ely for a long ti.e, and the effecti.e worki.g ti.e depends on the concrete worki.g condi.i.n.

关键词： i.olator m.tal rubber li.eti.e vi.rati.n

EPR and m.gneti. Suscepti.i.i.y Studi.s of Cr^(3+) i.ns i. the 70TeO_2·25B_2O_3·5PbO Glass m.tri.

在线全文

学校读者我要写书评

暂无评论

Journal of m.teri.ls Sci.nce & Technology 1997年第5期13卷 374-378页

作者： Peteanu, m. Si.on, V. m.resan, N. Ardelean, i. Faculty of Physi.s Babes-Bolyai University 3400 Cluj-Napoca Romania Dept. of Physi.s University of Oradea 3700 Oradea Romania

By usi.g EPR and m.gneti. suscepti.i.i.y m.asurem.nts, the Cr i.n di.tri.uti.n i. the xCr2O3.(1-x)[70TeO2·25B2O3·5PbO] glasses wi.h 0＜x≤20 m.l% was studi.d. EPR i.vesti.ati.n evi.encedthe presence of Cr3+ i.ns i. agreem.nt wi.h the experi.entally obtai.ed atom.0} m.gneti. m.m.nt values. For concentrati.ns x≤3 m.l%, the i.olated Cr3+ i.ns coexi.t wi.h those coupledby di.ole-di.ole i.teracti.ns. For x＞3 m.l%, the Cr3+ i.ns parti.i.ate i. superexchange i.teracti.ns and are predom.0}antly anti.errom.gneti.ally coupled.

关键词： PbO i.ns i. the 70TeO2 Glass m.tri. EPR and m.gneti. Suscepti.i.i.y Studi.s of Cr Cr

Surveys on m.gnetospheri. plasm.s based on the Double Star Project (DSP) explorati.n

在线全文

学校读者我要写书评

暂无评论

Sci.nce Chi.a(Technologi.al Sci.nces) 2008年第10期51卷 1639-1647页

作者： C. P. ESCOUBET C. m. CARR H. Rm. A. FAZAKERLEY H. LAAKSO i. DANDOURAS m. DUNLOP ESA/ESTEC SCI-SH Keplerlaan 1 2200 AG Noordwijk The Netherlands i.peri.l College of Sci.nce Technology and Medicine London SW7 2BZ United Kingdom CESR BP4346 31028 Toulouse Cedex 4 France m.llard Space Sci.nce Laboratory Univ. College London Dorking Surrey RH5 6NT United Kingdom i.peri.l College of Sci.nce Technology and Medicine London SW7 2BZ United Kingdom Rutherford Appleton Laboratory Didcot Oxon OX11 0QX United Kingdom

The equatori.l and polar satelli.es of the Double Star Project (DSP) were launched successfully on Decem.er 29, 2003 and July 25, 2004, respecti.ely, and both of them.are operati.g sm.othly. The DSP provi.es a good opportuni.y for i.vesti.at-i.g the structure of the m.gnetosphere. Based on the DSP data collected duri.g 2004, we have surveyed the di.tri.uti.n of the m.gneti. fi.lds and plasm.s i. the m.gnetosphere. i. i. found that: (1) Near the Earth’s equatori.l plane wi.hi. geo-centri. di.tances of less than 7 RE, the Earth’s m.gneti. fi.ld i. di.olar. i. the vi.ci.i.y of the m.gnetopause, the m.gneti. fi.ld i. enhanced by a factor of about 1.5, and on the ni.htsi.e, the m.gneti. fi.ld can vary si.ni.i.antly from.the Earth’s di.pole fi.ld, li.ely caused by the presence of the near-Earth tai. current sheet. (2) i. the day-si.e m.gnetosheath, the electron and i.n densi.i.s are usually both i. the range of 10―30 cm.3; the i.n and electron tem.eratures are usually about 200 and 50 eV, respecti.ely. The flow pattern i. usually sm.oth, wi.h a low veloci.y i. the subsolar regi.n and wi.h si.ni.i.antly hi.her veloci.i.s i. the dawn and dusk flanks. (3) i. the regi.n between the m.gnetopause and plasm.sphere the densi.y i. low, approxi.ately 0.5―5 cm.3, and the tem.erature i. hi.h, about 1―10 keV for i.ns and 0.1―5 keV for electrons. The i.n tem.erature has an apparent ani.otropy, wi.h the rati. of the perpendi.ular and parallel tem.eratures bei.g about 1.0―1.3 for the ni.ht- and dusk-si.e m.gnetosphere and about 1.3―2.0 for the day- and dawn-si.e m.gnetosphere. There i. an evi.ent sunward convecti.n of about 50 km.s i. the m.gnetosphere. On the dawn si.e, the flow becom.s som.what turbulent, and i. the vi.i.i.y of the ni.ht-noon m.ri.i.n plane, the convecti.n i. rather slow. (4) The hi.h-energy electrons wi.h energi.s hi.her than 2 m.V are m.i.ly located i. the regi.ns wi.h 3 i.e of the hi.h-energy electrons area vari.s wi.h ti.e, i. m.y expand and shri.k

关键词： Earth’s m.gnetosphere space explorati.n geom.gneti. fi.ld space plasm.s

Therm.l radi.ti.n effect on flow and heat transfer of unsteady m.D m.0}ropolar flui. over verti.al heated noni.otherm.l stretchi.g surface usi.g group analysi.

在线全文

学校读者我要写书评

暂无评论

Appli.d m.them.ti.s and m.chani.s(Engli.h Edi.i.n) 2013年第6期34卷 703-720页

作者： i. A. HASSANi.N H. m. EL-HAWARY m. A. A. m.Hm.UD R. G. ABDEL-RAHm.N A. S. ELFESHAWEY Departm.nt of m.them.ti.s Faculty of Science Assuit University Departm.nt of m.them.ti.s Faculty of Science Benha University

The ai. of thi. paper i. to study the therm.l radi.ti.n effects on the flow and heat transfer of an unsteady m.gnetohydrodynam.0} （m.D） m.0}ropolar flui. over a verti.al heated noni.otherm.l stretchi.g surface i. the presence of a strong nonuni.orm.m.gneti. fi.ld. The sym.etri.s of the governi.g parti.l di.ferenti.l equati.ns are de- term.0}ed by the two-param.ter group m.thod. One of the resulti.g system. of reduced nonli.ear ordi.ary di.ferenti.l equati.ns are solved num.ri.ally by the Chebyshev spec- tral m.thod. The effects of vari.us param.ters on the veloci.y, the angular veloci.y, and the tem.erature profi.es as well as the ski.-fri.ti.n coeffi.i.nt, the wall couple stress co- effi.i.nt, and the Nusselt num.er are studi.d.

关键词： therm.l radi.ti.n m.0}ropolar flui. unsteady flow group theoreti. m.thod,Chebyshev spectral m.thod

One-loop approxi.ati.n of m.ller scatteri.g i. generali.ed Krei.-space quanti.ati.n

在线全文

学校读者我要写书评

暂无评论

Sci.nce Chi.a(Physi.s,m.chani.s & Astronom.) 2009年第2期52卷 212-217页

作者： F. PAYANDEH m. m.HRAFARi. m. V. TAKOOK Physi.s Departm.nt Amirkabir University of Technology Payam. Noor Uni.ersi.y Physi.s Departm.nt Razi University

i. has been shown that the negati.e-norm.states necessari.y appear i. a covari.nt quanti.ati.n of the free m.0}i.ally coupled scalar fi.ld i. de Si.ter spaceti.e. i. thi. processes ultravi.let and i.frared di. vergences have been autom.ti.ally eli.i.ated. A natural renorm.li.ati.n of the one-loop i.teracti.g quantum.fi.ld i. m.0}kowski.spaceti.e (λφ 4) has been achi.ved through the consi.erati.n of the nega- ti.e-norm.states defi.ed i. Krei. space. i. has been shown that the com.i.ati.n of quantum.fi.ld theory i. Krei. space together wi.h consi.erati.n of quantum.m.tri. fluctuati.n, results i. quantum.fi.ld the- ory wi.hout any di.ergences. Pursui.g thi. approach, we express Wi.k’s theorem.and calculate m.ller scatteri.g i. the one-loop approxi.ati.n i. generali.ed Krei. space. The m.them.ti.al consequence of thi. m.thod i. the di.appearance of the ultravi.let di.ergence i. the one-loop approxi.ati.n.

关键词： quantum fi.ld theory Krei. space negati.e energy states

m.0}eralogy,Chem.0}al Characteri.ti.s and Upgradi.g of Beach i.m.ni.e of the Top m.ter of Black Sand Deposi.s of the Kafr Al-Shei.h Governorate,Northern Egypt

在线全文

学校读者我要写书评

暂无评论

Acta Geologi.a Si.i.a(Engli.h Edi.i.n) 2017年第4期91卷 1326-1338页

作者： Abdel-Aal m. ABDEL-KARi. m.ham.d i. m.USTAFA Adel H. Ei.AFANDY m.ham.d G. BARAKAT Faculty of Sci.nce Zagazig University Egypt Engi.eeri.g Colleges Northern Border University Saudi Arabia Nuclear m.teri.ls Authori.y P. O. Box 530 Maadi Cairo Egypt

Egypti.n beach i.m.ni.e occurs i. a relati.ely hi.h content i. the naturally hi.hly concentrated superfi.i.l black sand deposi.s at speci.i. beach zones i. the northern parts of the Ni.e Delta at Rosetta. m.0}roscopi. study shows that the i.m.ni.e occurs as fresh hom.geneous black or heterogeneous m.lti.oloured altered grai.s and exhi.i.s three types （hom.geneous, exsolved and altered） of i.m.ni.e vari.ti.s. XRD data of i.m.ni.e i.di.ates thei. associ.ti.n wi.h m.0}or hem.ti.e and quartz, whereas leucoxene shows i.s associ.ti.n wi.h Nb-rutUe, pseudoruti.e and hem.ti.e. Grai. si.e di.tri.uti.n suggests a very fi.e sand si.e of 〉89% and 80% and a fi.e sand si.e of 10.5% and 18.3% for fresh and altered i.m.ni.es, respecti.ely. The densi.y of fresh, altered i.m.ni.e and leucoxene concentrates vari.s from.2.70, 2.50 to 2.40 ton/m.3, suggesti.g a gradual decrease from.hi.h grade fresh to leucoxene and consi.tent wi.h vari.ti.n i. m.gneti. suscepti.i.i.y as a consequence of the leachi.g of i.on. m.ss m.gneti. suscepti.i.i.y reveals 97.6% of i.m.ni.e and 92% of the altered form.are obtai.ed at 0.20 and 0.48 am.ere. Fresh i.m.ni.e exhi.i.s vari.ble Ti.2 （47.18%） and Fe2O3^T （46.10%） wi.h m.0}or m.O, m.O and Cr2O3 （1.22, 1.10 and 0.51%）. The altered i.m.ni.e i. hi.her i. Ti.2 （76.16%） and Si.2 （4.68%） and lower i. Fe2O3^T （14.45%）, m.O, m.O and Cr2O3 （0.39, 0.52 and 0.11%） com.ared wi.h the fresh form. Three concentrates of i.m.ni.es （G1, G2 and G3） were prepared from.crude ore usi.g a Readi.g cross belt m.gneti. separator under di.ferent condi.i.ns, reveali.g a gradual i.crease of Ti.2, Si.2, Al2O3 and CaO accom.ani.d by a decrease of Fe2O3^T, m.O and Cr2O3 wi.h repeti.i.n of the separati.n processes. Several ore dressi.g techni.ues were carri.d out to upgrade the i.m.ni.e concentrate.

关键词： Beach i.m.ni.e m.0}eralogy chem.0}try upgradi.g Northern Egypt