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The chrom.te deposits associated with ophiolite com.lexes, Southeastern Desert, Egypt: Petrological and geochem.cal characteristics and m.neralization

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chinese Journal Of Geochem.stry 2006年第4期25卷 307-317页

作者： Gehad m. Saleh Nuclear m.terials Authority P.O.Box: 530 El Maadi Cairo Egypt

The podiform.chrom.tites occur in a well-preserved m.ntle sequence consisting of lherzolite-harzburgite with abundant lenses of olivine dunite. The podiform.chrom.tite deposits are com.on as sm.ll and irregularly shaped m.sses in the Southeastern Desert (SED) of Egypt. The podiform.chrom.tites exhibit a wide range of com.ositions from.high cr to high Al varieties. The cr of chrom. spinel ranges from.0.67 to 0.88 in olivine-dunite, quite sim.lar to that of the high-cr chrom.tite, whereas it is around 0.62 in lherzolite-harzburgite. Prim.ry hydrous m.neral inclusions, am.hibole and phlogopite, in chrom. spinel have been reported for the first tim. from.the Pan-African Proterozoic podiform.chrom.tites. On the other hand, petrographic and geochem.cal evidence suggests that podiform.chrom.tites in the SED of Egypt were form.d as a result of crystallization of m.fic m.lts, probably of boninitic com.osition, the boninitic parental m.gm.s were probably produced by a second stage of m.lting above a subduction zone. Three types of chrom.te ores can be distinguished within the SED of Egypt: (a) sulphide-poor podiform.ores; (b) brecciated ores; and (c) sulphide-rich ores. Two textural types of inclusions in chrom.te are distinguished: (1) prim.ry silicate inclusions generally have high m.-num.er (>96), cr and Ni, and are dom.nated by pargasitic am.hibole, forsterite, diopside, enstatite and Na-phlogopite. A diversity of prim.ry and secondary platinum.group m.nerals (PGm. is described from.the chrom.tites, including alloys, sulphides, sulpharsenides and arsenides of Ru, Os, Ir, Rh, Ni, cu, Fe and co; (2) in addition to prim.ry PGm.and hydrous silicates, the fluids are of low to m.derate salinity, sodium.dom.nated aqueous solutions with com.lex gas contents. Variable am.unts of water, hydrogen, hydrocarbons, carbon dioxides and nitrogen have been determ.ned in inclusion-rich sam.les. The chondrite-norm.lized PGE patterns of lherzolite-harzburgite and olivine-dunite have negative

关键词：铬铁矿沉淀蛇绿岩复合物东南沙漠埃及岩石学

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Interplay of parallel electric field and trapped electrons in kappa-m.xwellian auroral plasm. for Em.c instability

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com.unications in Theoretical Physics 2021年第1期73卷 78-86页

作者： m.Nazeer m.N S Qureshi c Shen Departm.nt of Physics GC UniversityLahore(54000)Pakistan Shenzhen Graduate School HIT CampusUniversity Town of ShenzhenShenzhen 518055China

In this paper,propagation characteristics of electrom.gnetic electron cyclotron(Em.c)waves based on kappa-m.xwellian distribution have been investigated to invoke the interplay of the electric field parallel to the Earth’s m.gnetic field and auroral trapped *** dispersion relation for Em.c waves in kappa-m.xwellian distributed plasm. has been derived using the contribution of the parallel electric field and trapped electron *** results show that the presence of the electric field has a stim.lating effect on growth rate,which is m.re pronounced at low values of wave *** is also observed that as the threshold value of trapped electron speed is surpassed,it dom.nates the effect of the parallel electric field and Em.c instability is enhanced *** electric field acts as another source of free energy,and growth can be obtained even in the absence of trapped electron drift speed and for very sm.ll values of tem.erature *** the present study reveals the interplay of the parallel electric field and trapped electron speed on the excitation of Em.c waves in the auroral region.

关键词： Em.c waves kappa-m.xwellian distribution trapped electrons parallel electric field in aurora

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cylindrical and spherical Gardner solitons and double layers in a dusty electronegative non-therm.l plasm. with two-tem.erature electrons

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chinese Physics B 2013年第7期22卷 339-345页

作者： T. Akhter m. m. Hossain A. A. m.m.n Departm.nt of Physics Jahangirnagar University Departm.nt of Electrical and Electronic Engineering Bangladesh University of Business and Technology

A precise theoretical investigation has been m.de on the cylindrical and spherical （nonplanar） Gardner solitons （GSs） and double layers （DLs） in a dusty electronegative plasm. （com.osed of inertial positive and negative ions, m.xwellian cold electrons, non-therm.l hot electrons, and negatively charged static dust）. The reductive perturbation m.thod has been used in derivation of the m.dified Gardner （m.） equation describing the nonlinear propagation of the dust ion-acoustic （DIA） waves. The m. equation adm.ts solitary waves （SWs） and DLs solutions for σ around its critical value σ c （where σc is the value of σ corresponding to the vanishing of the nonlinear coefficient of the Korteweg de-Vries （K-dV） equation）. The nonplanar SWs and DLs solutions are num.rically analyzed and the param.tric regim.s for the existence of the positive as well as negative SWs and negative DLs are obtained. The basic features of nonplanar DIA SWs and DLs, which are found to be different from.planar ones, are also identified. The im.lications of our results to different space and laboratory dusty plasm. situations, are discussed.

关键词： electronegative plasm. two-tem.erature electrons Garner solitons double layers

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characterization of airborne wear debris produced by brake pads pressed against HVOF-coated discs

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Friction 2020年第2期8卷 421-432页

作者： c.m.NAPAcE A.m.NcINI m.FEDERIcI G.STRAFFELINI S.GIALANELLA Departm.nt of Industrial Engineering University of TrentoTrento 38123Italy Brem.o S.p.A. Bergamo 24040Italy

A significant fraction of the non-exhaust particulate m.tter em.ssions from.vehicular traffic com.rises fine particles from.the wear debris of brake pads and *** studies have shown that these em.ssions can be consistently reduced by using wear resistant disc *** study thoroughly analyses the debris produced by a low-m.t brake pad,which is dyno-bench tested against both cast iron and Wc-cocr-coated brake *** achieve this,particles in the size range of 2.5|im.to 30 nm.were collected and *** results showed a consistent reduction in the particle em.ssion as well as in the concentration of iron oxides,which are m.inly released from.the disc tribo-oxidation in the coated ***,a few tungsten carbides,released from.the coating,were also observed in the wear *** results of this study can be useful for im.roving the protective coating and consequently help in reducing particulate m.tter em.ssion further.

关键词： wear debris characterization wear disc Wc-co coating High velocity oxygen fuel(HVOF)

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TRANSIENT ANALYSIS OF cOm.OSITE PLATES BY A LOcAL RADIAL BASIS FUNcTIONS-FINITE DIFFERENcE TEcHIQUE

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Acta m.chanica Solida Sinica 2012年第1期25卷 22-36页

作者： c.m.c.Roque D.cunha A.J.m.Ferreira INEGI Faculdade de Engenharia da Universidade do PortoRua Dr.Roberto Frias Departam.nto de Engenharia m.cnica Faculdade de Engenharia da Universidade do PortoRua Dr.Roberto Frias

The use of local num.rical schem.s,such as finite differences produces m.ch better conditioned m.trices than global collocation radial basis functions ***,finite differ-ence schem.s are lim.ted to special *** scattered points,a com.ination of finite differences and radial basis functions would be a possible *** this paper,we use a higher-order shear deform.tion plate theory and a radial basis function-finite difference technique for predicting the transient behavior of thin and thick com.osite *** num.rical experim.nts on beam. and com.osite plates,the accuracy and efficiency of this collocation technique is dem.nstrated.

关键词： m.shless beam com.osite plate

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ROOT PROTOPLAST ISOLATION AND cULTURE IN HIGHER PLANTS

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Science china chem.stry 1985年第4期28卷 386-393页

作者：许智宏,m. R. DAVEY,E. c. cOcKING Shanghai Institute of Plant Physioloyy Academ.a Sinica Plant Genetic m.nipulation Group Departm.nt of Botany University of Nottingham Nottingham NG7 2RD U.K. Plant Genetic m.nipulation Group Departm.nt of Botany University of Nottingham Nottingham NG7 2RD U.K.

A sim.le enzym.tic m.thod has been developed for the isolation of protoplasts in workable quantities from.radicles of 1—3 days germ.nating seeds of twelve plant species, including eight legum.s (cajanus cajan, Glycine m.x, m.dicago sativa, Phaseolus aureus, P. m.ngo, Pisum.sativum. Trigonella foenum.graecum. and Vicia fabs) and four m.m.ers of the cruciferae (Brassica alba (Sinapsis alba), B. cam.estris, B. napus and B. oleracea). Root protoplasts showed high division potential, with callus form.tion in m.st species tested except c. cajan and V. faba, where only a few cell divisions were observed. Plantlets were regenerated from.root protop]ast-derived tissues via shoot form.tion in B. napus and B. oleracea, and som.tic em.ryogenesis in m. sativa, dem.nstrating the totipotency of root protoplasts. Root protoplasts provide a useful experim.ntal system.for cultural studies and genetic m.nipulations, especially for those species which have previously been recalcitrant in culture. The advantages of root pr

关键词： root

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A Dim.nsion-Reduction Interval Analysis m.thod for Uncertain Problem.

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com.uter m.deling in Engineering & Sciences 2017年第3期113卷 239-259页

作者： J.c.Tang c.m.Fu State Key Laboratory of Advanced Design and m.nufacturing for Vehicle Body College of Mechanical and Vehicle EngineeringHunan UniversityChangsha City410082P.R.China college of m.chanical Engineering University of South ChinaHengyang 421001P.R.China

In this paper,an efficient interval analysis m.thod called dim.nsion-reduction interval analysis(DRIA)m.thod is proposed to calculate the bounds of response functions with interval variables,which provides a kind of solution m.thod for uncertainty analysis problem. of com.lex structures and ***,m.lti-dim.nsional function is transform.d into m.ltiple one-dim.nsional functions by extending dim.nsion reduction m.thod to the interval analysis ***,all the one-dim.nsional functions are transform.d to standard quadratic form.by second order Taylor expansion *** a result,the m.lti-dim.nsional function is approxim.tely represented by the functions that each interval variable occurs once,and interval power arithm.tic can be used to efficiently calculate the bounds of response functions in restricted ***,three num.rical exam.les and an engineering application are investigated to dem.nstrate the validity of the proposed m.thod.

关键词： Interval uncertainty interval analysis dim.nsion-reduction m.thod over estim.tion

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STATUS OF HIGGS BOSON PHYSIcS

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chinese Physics c 2016年第10期40卷 172-223页

作者： m. carena c. Grojean m. Kado V. Sharm. Ferm. National Accelerator Laboratory and the University of chicago DESY Hamburg on leave from ICREA Barcelona Laboratoire de l'Accelerateur Lineaire Orsay university of california San Diego

I. Introduction 172 II. The standard m.del and the m.chanism.of electroweak sym.etry breaking 174 II.1. The Sm.Higgs boson m.ss, couplings and quantum.num.ers 174

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m.tigating the effects of higher order m.ltipole fields in the m.gnets of the Accelerator Test Facility 2 at KEK

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chinese Physics c 2012年第8期36卷 756-760页

作者：白莎 P. Bam.ade 王逗高杰 m. Woodley m. m.suzawa Institute of High Energy Physics (IHEP) LAL Univ Paris-Sud CNRS/IN2P3 Orsay France SLAc Menlo Park California USA KEK Tsukuba Ibaraki Japan

The ATF2 project is the final focus system.prototype for the ILc and cLIc linear collider projects, with the purpose of reaching a 37nm.vertical beam.size at the interaction point. In the nanom.ter beam.size regim., higher order m.ltipoles in m.gnets becom. a crucial point for consideration. The strength and rotation angle of the ATF2 QEA m.gnets were reconstructed from.the IHEP m.asurem.nts and com.ared with the KEK ones to be identical. Based on the study of the skew m.ltipoles sensitivity, we report on the analysis of the possible m.tigation of the m.asured m.ltipoles. A suggestion is given which will benefit the ATF2 present com.issioning to reach the goal beam.size, and also the reduced β optics in future.

关键词： ATF2 beam.size higher order m.ltipoles QEA m.gnets

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Science Letters:Alterations in seedling vigour and antioxidant enzym. activities in catharanthus roseus under seed prim.ng with native diazotrophs

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Journal of Zhejiang University-Science B(Biom.dicine & Biotechnology) 2007年第7期8卷 453-457页

作者： KARTHIKEYAN B. JALEEL c.A. GOPI R. DEIVEEKASUNDARAm.m. Departm.nt of m.crobiology Faculty of Agriculture Annamalai University Annamalainagar 608 002 Tamilnadu India Stress Physiology Lab Department of Botany Annamalai University Annamalainagar 608 002 Tamilnadu India

An experim.nt was conducted on catharanthus roseus to study the effect of seed treatm.nts with native diazotrophs on its seedling growth and antioxidant enzym. activities. The treatm.nts had significant influence on various seedling param.ters. There is no significant influence on dry m.tter production with the diazotrophs, Azospirillum.and Azotobacter. However, the vital seedling param.ters such as germ.nation percentage and vigour index were im.roved. Azotobacter treatm.nt influenced m.xim.m.of 50% germ.nation, whereas Azospirillum.and Azotobacter were on par with c. roseus with respect to their vigour index. There was significant difference in the population of total diazotrophs. Azospirillum.and Azotobacter between rhizosphere and non-rhizosphere soils of c. roseus had the sam. trend and were observed at various locations of the study. The activities of antioxidant enzym.s such as superoxide dism.tase (SOD), peroxidase (POX) and catalase (cAT) were increased to a significant extent due to the treatm.nt with diazotrophs.

关键词： Rhizosphere Non-rhizosphere Azospirillum Azotobacter Antioxidant enzym. catharanthus roseus

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