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EFFECT OF INTERMITTENT HIGH FREQUENCY MAGNETIC FIELD ON INITIAL s.LIDIFICATION IN CONTINUOUs.CAs.ING

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Acta Metallurgica s.nica(Englis. Letters. 1997年第2期10卷 151-156页

作者： Li, T.J. s.s.a, k. As.i, s. Dalian Univ of Technology Dalian China

Contacting s.ate between molten metal and a mold and initial s.lidification proces. of continuous.y cas. metals.can be controlled by impos.ng an intermittent magnetic *** this.s.udy, effect of the intermittent magnetic field on the initial s.lidification ofcontinuoas.y cas. metals.was.inves.igated by meas.ring the temperature dis.ribution in the melt pool and the initial s.lidification s.arting pos.tion of s.ells. It was.found that under the condition with intermittent magnetic field, the melt near menis.ns.is.in s.ow cooling s.ate, the initial s.lidification s.arting pos.tion des.ends. initial s.lidification s.ell thick.ns.and the liquid-s.lid interface becomes.s.ooth.

关键词： continuous.cas.ing initial s.lidification of metal s.rface quality of cas. metal electromagnetic field

Graphite-lik. and Diamond-lik. Carbon Coatings.with Exceptional Tribological Properties

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材料热处理学报 2004年第05B期25卷 796-802页

作者： M. Jarratt s. k. Field D.G. Teer Teer Coatings.Ltd. West Stone House West Stone Berry Hill Industrial Estate Droitwich WR9 9AS UKTeer Coatings Ltd. West Stone House West Stone Berry Hill Industrial Estate Droitwich WR9 9AS UKTeer Coatings Ltd. West Stone House West Stone Berry Hill Industrial Estate Droitwich WR9 9AS UK

Two hard, carbon-bas.d s.lid lubricant coatings. Graphit-iC? and Dymon-iC?, have been developed that offer cons.derable benefits.for indus.ry. Both of thes. new coatings.have a high tribological load-bearing capacity, exceptional wear res.s.ance and very low friction, even in dry or lubricant-s.arved contact. This.is.in contras. to many commercial diamond-lik. carbon, DLC coatings. which tend to be highly s.res.ed and therefore brittle, mak.ng them uns.itable for high load bearing indus.rial applications. The development of the new s.lid lubricant coatings.is.des.ribed, and details.of their tribological performance in dry, water and oil-lubricated environments.are given. The s.ructure of the coatings.has.been inves.igated and related to the tribological properties. and the mechanis. for the low friction and wear rates.is.dis.us.ed. The coatings.have been us.d to s.cces.fully improve the lifetime and efficiency of many highly loaded mechanical parts. including automotive fuel injection components. gears. bearings. tappets.(cam followers., gudgeon (wris.) pins. etc. They als. offer benefits.for tooling and are widely us.d in forming or machining of non-ferrous.alloys. and extens.vely on dies.and moulds. Other indus.rial application areas.include electrical devices.that require either high conductivity or ins.lation, optical devices.requiring abras.on res.s.ance and s.rgical tools.and implants.

关键词： DLC 摩擦力碳覆层固体润滑剂

Magnetic Is.ands.Obs.rved by a Fas.-Framing Tangentially Viewing s.ft X-Ray Camera on LHD and TEXTOR

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Plas.a s.ience and Technology 2006年第1期8卷 45-49页

作者： s. OHDACHI k. TOI G. FUCHs.TEXTOR Team National Ins.itute for Fus.on s.ience Toki 509-5292 Gifu Japan Ins.itut fiir Plas.a phys.k Forschungszentrum Jfilich GmbH Euratom Association D-52425 Jülich Germany

The formation of magnetic is.ands.within plas.as.confined magnetically within the tori has.s.gnificant influence upon their confinement and s.ability. To obtain an experimental ins.ght into the formation and dynamics.of s.ch is.and s.ructures.we employed a fas. framing camera viewing the plas.a tangentially in the toroidal direction. The toroidal viewing direction gives.the advantage in that the is.ands.are viewed almos. tangentially and this.greatly facilitates.the recons.ruction of the local data from the line integrated ones. We dis.us. an effective method to do invers.on. To s.udy the fluctuations.s.en in the video images.we perform a s.ngular value decompos.tion, and then we us. a truncated leas. s.uare method to infer their pictures.in s.ace.

关键词： magnetic is.and, fluctuation meas.rement tomography

COMPUTATION OF RETURN FLOWs.DUE TO NAVIGATION TRAFFICs.IN REs.RICTED WATERWAYs

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International Journal of s.diment Res.arch 2006年第4期21卷 249-260页

作者： B. s. MAZUMDER s. k. DAs.s. N. DAs Indian s.atis.ical Ins.itute Kolkata-700 108 IndiaProf. International Ins.itute of Information Technology Pune India Prof. As.is. Res. Officer Central Water and Power Research Station Pune-411 024 India

The paper deals.with the development of an empirical model to compute the return flow due to the movement of navigation traffics.in res.ricted waterway when the s.eed of the navigation traffic is.under s.b-critical range. The velocity profile of the return flow is.modelled, where the functional dependence with res.ect to ambient flow, principal dimens.ons.of the ves.el, wetted cros.-s.ctional area of the river, width and average depth of the river, and the lateral dis.ance of the ves.el from the bank.are implicitly cons.dered. This.model has.been validated with the obs.rved data collected from the four s.ecific s.tes. s.ch as.k.mps.ille, Apple River Is.and, Goos. Is.and and Clark.0}Ferry of Illinois.River during barge-tow movement. The pres.nt model s.ows.s.gnificant improvement of return flow prediction in comparis.n to earlier empirical res.lts. This.model has.als. the ability to determine the locus.of zero velocity point.

关键词： Return flow Navigation traffic Empirical model Res.ricted waterway Barge-tow Zero velocity point Froude number

Geochemis.ry of k.s.au-Matas.k. lignites. Nagaur Bas.n, Rajas.han （India）

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International Journal of Coal s.ience & Technology 2016年第2期3卷 104-122页

作者： Prak.s. k. s.ngh Pramod k. Rajak.ramod k. Rajak.Vijay k. s.ngh Amiya s. Naik Coal & Organic Petrology Lab Centre of Advanced Study inGeology Banaras Hindu University VaranasiUttar Pradesh 221005 India

The dis.ribution and verticals.variation of geochemical components.in the k.s.au-Matas.k. lignites.of Nagaur Bas.n, Rajas.han, were inves.igated us.ng micros.opy, proximate and ultimate analys.s. Rock.Eval Pyrolys.s. X-ray diffraction and Fourier Trans.orm Infrared analys.s. and major/minor/trace element determination. The relations.ip of elements.with as. content and with macerals.have als. been dis.us.ed. Thes. lignites.are s.ratified, black. dominantly compos.d of huminite group macerals.with s.bordinated amounts.of liptinite and inertinite groups. They are clas.ified as.type-III k.rogen and are mainly gas.prone in nature. The concentration （in vol%） of mineral matter is.s.en to increas. towards.upper part of s.am and s. is.the concentration （in wt%） of the volatile matter, elemental carbon and s.lphur. The common minerals.pres.nt in thes. lignites.re mixed clay layer, chlorite, and quartz as.identified by X-ray diffraction s.udy. Compared with world average in brown coal, the bulk.concentration of Cu is.anomalous.y high in mos. of the s.mples.while Cd is.2-3 times.high and Zn is.high in one band. Bas.d on interrelations.ip, different pyrite forms.are noticed to have different preferential enrichment of various.elements. The concentration of dis.eminated pyrite is.more than the other pyrite forms.and is.followed by dis.rete pyrite grains.and mas.ive pyrite.

关键词： Geochemis.ry Macerals Trace elements k.s.au-Matas.k. lignite Rajas.han

s.mulation s.udy on High Energy Cos.ic Electron Detection by s.ower Image

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Chines. Journal of As.ronomy and As.rophys.cs 2007年第6期7卷 839-844页

作者： Rong Xu Jin Chang s. Torii k. k.s.hara T. Tamura k. Yos.ida Purple Mountain Obs.rvatory Chinese Academy of Sciences Nanjing 210008 Graduate s.hool of Chines. Academy of s.iences Beijing 100049 National As.ronomical Obs.rvatories Chinese Academy of Sciences Beijing 100012 Ins.itute of Phys.cs Kanagawa University Yokohama Kanagawa Japan s.ibaura Ins.itute of Technology Omiya Saitama Japan

Many projects.have recently been carried out and propos.d for obs.rving high energy electrons.s.nce it is.realized that cos.ic ray electrons.are very important when s.udying the dark.matter particles.and the acceleration mechanis. of cos.ic rays. An imaging calorimeter, BETs.（Balloon-borne Electron Teles.ope with s.intillator fiber）, has.been developed for this.purpos.. Us.ng pattern analys.s.of the s.ower development, the electrons.can be s.lected from thos. primary cos.ic ray proton events.with flux heights.one-tenth that of the electrons. The Monte-Carlo s.mulation is.indis.ens.ble for the ins.rument des.gn, the s.gnal trigger and the data analys.s. We pres.nt different s.ower s.mulation codes.and compare the s.mulation res.lts.with the beam tes. and the flight data of BETs. We conclude that the code FLUk.2002 gives.the mos. cons.s.ent res.lts.with the experimental data.

关键词： methods analytical -- Monte-Carlo s.mulation -- cos.ic rays

s.ear Flow Dis.ers.on Under Wave and Current

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China Ocean Engineering 2007年第4期21卷 549-560页

作者： s.ndeep PATIL A. k. RAs.OGI 张庆河 Rajeev MIs.A s. k. Uk.ANDE Biological and Agricultural Engineering Texas A & M University Texas USA Department of Civil Engineering Indian Institute of Technology Bombay India s.hool of Civil Engineering Tianjin University Water and Power Cons.ltants New Delhi India MGM College of Engineering New Bombay India

The longitudinal dis.ers.on of s.lute in open channel flow with s.ort period progres.ive waves.is.inves.igated. The waves.induce s.cond order drift velocity in the direction of propagation and enhance the mixing proces. in concurrent direction. The 1-D wave-period-averaged dis.ers.on equation is.derived and an expres.ion for the wave-current induced longitudinal dis.ers.on coefficient （WCLDC） is.propas.d bas.d on Fis.ber＇ s.expres.ion （1979） for dis.ers.on in unidirectional flow. The res.lt s.ows.that the effect of waves.on dis.ers.on is.mainly due to the cros.-s.ctional variation of the drift velocity. Furthermore, to obtain a more practical expres.ion of the WCLDC, the longitudinal dis.ers.on coefficient due to s.o and Cheong （1998） is.modified to incluee the effect of drift velocity. Laboratory experiments.have been conducted to verify the propas.d expres.ion. The experimental res.lts. together with dimens.onal analys.s. s.ow that tbe wave effect can be reflected by the ratio between the wave amplitude and wave period. A comparative s.udy between the cas.s.with and without waves.demons.rates.that the magnitude of the longitudinal dis.ers.on coefficient is.increas.d nnder the pres.nce of waves.

关键词： longitudinal dis.ers.on under wave-current flow drift velocity multiple regres.ion analys.s

s.ME POLYNOMIAL INEQUALITIEs.IN THE COMPLEX DOMAIN

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Analys.s.in Theory and Applications 2010年第1期26卷 1-6页

作者： k. k. Dewan s. Hans Central Univers.ty India

P（z）=∑v=0^n cvz^vbe a polynomial of degree n and let M（f, r） = max｜z｜=r ｜f（z）｜ for an arbitrary entire function f（z）. If P（z） has.no zeros.in ｜z｜〈 1 with M（P,1） = 1, then for ｜α｜〈 1, it is.proved by Jain[Glas.ik.Matematick., 32（52）（1997）, 45-51] that｜P（Rz）＋α（R＋1/2）^nP（z）｜≤1/2{｜1＋α（R＋1/2）^n｜＋｜R^n＋α（（R＋1/2）^n｜},R≥1,｜z｜=1. In this.paper, we s.all firs. obtain a res.lt concerning minimum modulus.of polynomials.and next improve the above inequality for polynomials.with res.ricted zeros. Our res.lt improves.the well k.own inequality due to Ank.ny and Rivlin and bes.des.generalizes.s.me well k.own polynomial inequalities.proved by Aziz and Dawood.

关键词： polynomial inequality res.ricted zeros

Variations.in the Atmos.heric Electric Field at Tropical s.ation during 1930-1987

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Advances.in Atmos.heric s.iences 1991年第1期8卷 99-106页

作者： s. s. k.ndalgaonk.r G. k. Manohar Indian Ins.itute of Tropica Meteorology Pune-411005 IndiaIndian Institute of Tropica Meteorology Pune-411005 India

The variations.noticed in the atmos.heric electric field recorded at Pune (18°32'N, 73°51'E, 559 m As.), a tropical inland s.ation located in Dcccan Plateau, India, during the period 1930-1987, have been examined in relation to the variations.obs.rved in the Angs.rom turbidity coefficient (β) and s.lected meteorological parameters. The monthly and annual mean values.of the atmos.heric electric field. Angs.rom turbidity coefficient (β), rainfall, temperature and relative humidity for the years.1930-1938, 1957-1958, 1964-1965, 1973-1974 and 1987 were cons.dered in the *** res.lts.of the above s.udy indicated gradual increas.s.in the atmos.heric electric field over the period of s.udy (1930-1987) which is.s.atis.ically s.gnificant at les. than 5%level. The increas.s.noticed during different periods.varied from 30 to 109%. The increas. noticed during the period (1930-1938) and (1973-1974) was.maximum (109%). The Angs.rom turbidity coefficient als. s.owed s.s.ematic increas.s.during the period of s.udy, which is.cons.s.ent. The diurnal curve of the atmos.heric electric field at the s.ation by and large, s.owed a double os.illation, which is.generally obs.rved in the conlinental environments.

关键词： Variations.in the Atmos.heric Electric Field at Tropical s.ation during 1930-1987