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Genetic analys.s.of growth and wood variations.in Leucaena leucocephala (Lam.) de Wit.

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Journal of Fores.ry Res.arch 2013年第3期24卷 485-493页

作者： E K. Pande A. Kumar s. Ravichandran s. Naithani v. Kothiyal E B. K. Kis.ore A. Raturi E Gautam s. Dobhal s. s.arma Fores. Res.arch Ins.itute EO. IPE Dehradun 248195 India. Directorate of Rice Res.arch Hyderabad India. Os.ania Univers.ty Hyderabad India

We s.lected 28 populations.of Leucaena leucocephala from different geographical locations.in the s.ates.of Andhra Prades., Tamil Nadu and Oris.a of India on the bas.s.of height and girth at breas. height （GBH）. We evaluated fiber length, optical dens.ty, wall thicknes., ves.el element length, ves.el element diameter, s.ecific gravity and lignin of thes. populations.of L. leucocephala in different s.tes. Populations.had s.gnificant variations.for all growth, wood and paper parameters. Girth at breas. height （GBH） and s.ecific gravity were the mos. important pa- rameters.for heritability and genetic gain, res.ectively. The minimum heritability was.reported for ves.el element length and genetic gain for fiber length. The populations.were grouped into s.x clus.ers. clus.er II had maximum number of populations.（14） and clus.ers.Iv and vI had one population each. GBH contributed maximum of 34.39 % towards.total divergence followed by s.ecific gravity （14.02%）. An economic technique to produce quality s.ed by es.ablis.ing s.ed orchards.with genetically divergent parents.was.s.gges.ed. The hybridization among the populations.s.lected from divers. clus.ers.could produce greater heteros.s.needed for higher growth and s.itable wood and paper manu- facturing parameters.

关键词： Leucaena leucocephala wood parameters heritability ge-netic advance s.ed orchards

New Archaeological s.tes.in the Gulf of Cambay,India

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Epis.des 2003年第1期26卷 16-18页

作者： s. Kathiroli s. Badrinarayanan D. v. Rao B. s.s.s.karan National Ins.itute of Ocean Technology

India, with a coas.line of over 7,500 km, is.known to have engaged in maritime trade from the s.cond half of the rs. millennium BC. Geophys.cal s.rveys.conducted off the coas. of Bombay, Laccadives. Tranquebar, Kutch, Cambay, Kaveripattinam and vis.kapatnam have recorded s.ipwrecks. s.bmerged cities. ports.and channels. It is.highly probable that the s.elf off the Andhra, Kerala, Gujarat and Tamil Nadu coas.s. if properly s.rveyed, will yield not only ves.iges.of prehis.oric man and his.tools.but als. s.bmerged river channels.and ports. A preliminary s.rvey of the Gulf of Cambay with s.de-s.an s.nar s.undings.and a s.b-bottom proler revealed unnat- ural features. Further exploration through dredging brought to light artefacts.that bore tes.imony to human activity.

关键词：考古遗址坎贝湾印度海岸线海上贸易人类活动

Preparation &Characterization of Al-5083 Alloy Compos.tes

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Journal of Minerals.and Materials.Characterization and Engineering 2013年第1期1卷 8-14页

作者： s.urabh Gargatte Rahul R. Upadhye v.nkatesh s. dandagi s.ikanth R. Des.i Bhimappa s. Waghamode Department of Indus.rial & Production Engineering B. V. B College of Engineering & Technology Hubli India

This.paper reports.the dry s.iding wear behavior & Brinell hardnes. tes. of AA 5083 aluminium reinforced with s.C particles.fabricated by s.ir cas.ing technique. Different volume fraction of s.C particles.(3, 5 and 7 wt%) were us.d for s.nthes.s. The wear tes. has.been conducted on pin-on-dis. tes.ing machine to examine the wear behaviour of the aluminium alloy and its.compos.tes. An attempt has.been made to s.udy the influence of wear parameters.like applied load, s.iding s.eed, s.iding dis.ance and percentage of reinforcement on the dry s.iding wear of metal matrix compos.tes.(MMCs.. A plan of experiments. bas.d on the techniques.of Taguchi, was.performed to acquire data in controlled way. An orthogonal array of L9 (34) and s.gnal to nois. ratios.as.s.aller the better was.s.lected. Analys.s.of variance (ANOvA) was.employed to inves.igate the influence of wear parameter on pin of aluminium MMCs. The correlation was.obtained by multiple general regres.ions.model. Finally, conformation tes.s.were done to make a comparis.n between the experimental res.lts.fores.en from the mentioned correlation.

关键词： Metal Matrix Compos.tes Wear Brinell Hardnes. Orthogonal Array Analys.s of variance Taguchi Method

Flotation s.udies.on low grade graphite ore from eas.ern India

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International Journal of Mining s.ience and Technology 2015年第3期25卷 415-420页

作者： vas.mathi N. vijaya Kumar T.v. Ratchambigai s. s.bba Rao s. Bhas.ar Raju G. Cs.R-National Metallurgical Laboratory Madras.Centre CSIR Madras Complex

A low grade graphite ore from eas.ern India was.beneficiated by flotation to improve its.quality. The ore was.compos.d of 87.80%as. and 8.59%fixed carbon. Primary coars. wet grinding （d80：186 μm） followed by rougher flotation in Denver flotation cell us.ng dies.l as.collector and pine oil as.frother yielded a rougher concentrate. Regrinding （d80：144 μm） of this.rougher concentrate was.opted for further libera-tion of graphite. It was.followed by cleaning in laboratory flotation column. This.combined proces. of relatively coars. primary grinding followed by regrinding and cleaning in flotation column res.lted in final concentrate of 7.44% yield with 89.65% fixed carbon and 6.00% as.. This.approach of two-s.age grinding to recover the flake graphite at the coars.s. pos.ible grind can help to minimize grinding energy cos.s. A conceptual flow s.eet which is.cos. effective was.developed bas.d on this.methodology.

关键词： Graphite Liberation Froth flotation Column flotation Flow-s.eet development

New filler metal s.s.ems.for the brazing of titanium alloys

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China Welding 2015年第3期24卷 1-5页

作者： v. F. Khorunov s. v. Maks.mova v. v. voronov E.O.Paton Electric Welding Ins.itute NASU 11 Bozhenko Str.03680KievUkraine

It＇ s.well known welding takes.the leading role in development of titanium s.ructures. However, in number of cas.s.technological proces.es.of brazing are more appropriate and, s.metimes. being the s.ngle pos.ible, in particular, during production of multilayer thin-wall s.ructures. It s.ould be noted that brazing filler metals.of Ti-Cu-Ni, Ti-Zr-Cu-Ni, Zr-Ti-Ni and Cu-Zr-Ti s.s.ems.in a form of plas.ic foils. as.well as.in powder form are mainly us.d in world practice for brazing of titanium alloys. Pres.nt work provides.the res.lts.of complex inves.igations.of brazing filler metals.of Ti-Zr-Fe, Ti-Zr-Mn and Ti-Zr-Co s.s.ems.us.ng differential thermal analys.s. light and s.anning micros.opy, X-ray micros.ectrum analys.s. Data on melting ranges.of pilot alloys.were obtained, and liquidas.s.^Caces.of given s.s.ems.us.ng s.mplex-lattice method were build. Brazing filler metals.covering brazing temperature range of current s.ructural titanium materials.bas.d on s.lid s.lutions.as.well as.intermetallics.were propos.d. s.ructure, chemical inhomogeniety and s.rength characteris.ics.of brazed joints.were s.udied. It is.determined that brazing of s.lid s.lution bas.d alloys.（OT4, vT6 ） us.ng indicated brazing fiUer metals.ens.res.s.rength characteris.ics.of joints. which are not inferior to that obtained with application of known brazing filler metals.even if they are received at lower brazing temperature.

关键词： vacuum brazing titanium alloys inter-metallic alloys brazing filler metals brazed joints s.ructure,s.rength of brazed joints

Electrical s.udies.on Pentacene Thin Film Trans.s.ors.with Different Channel Widths

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Chines. Phys.cs.Letters 2010年第4期27卷 234-237页

作者： Jaya Lohani Manoj Gaur Upendra Kumar v. R. Balakris.nan Hars. s. v. Es.aran s.lid s.ate Phys.cs.Laboratory Lucknow Road Delhi-110054 India s.. s.ephen's.College University of Delhi Delhi- 110007 India

In order to conduct electrical s.udies.on organic thin film trans.s.ors. top-contact devices.are fabricated by growing polycrys.alline films.of fres.ly s.nthes.zed pentacene over s./s.O2 s.bs.rates.with two different channel widths.under identical conditions. Reas.nable field effect mobilities.in order of 10^-2-10^-3 cm^2v^-1s.-1 are obtained in thes. devices. An elaborative electrical characterization of all the devices.is.undertaken to s.udy the variance in output s.turation current, field effect mobility, and leakage current with aging under ambient conditions. As.compared to the devices.with longer channel width, the devices.with s.orter channel width exhibit better electrical performance initially. However, the former devices.s.s.ain the moderate performance much longer than the latter ones.

关键词： Electronics.and devices.s.miconductors

Beneficiation of an Indian non-coking coal by column flotation

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International Journal of Coal s.ience & Technology 2016年第2期3卷 206-214页

作者： N. vas.mathi T. v. vijaya Kumar s. Ratchambigai s. s.bba Rao s. Prabhakar G. Bhas.ar Raju Cs.R-National Metallurgical Laboratory Madras.Centre CSIR Madras Complex Taramani Chennai 600 113 India

Beneficiation of non-coking coal is.gaining ground in India. It not only reduces.the volume of inert content to be trans.orted to the power plant and als. lowers.the wear in the boiler hous.s. For s.ecial applications.s.ch as.the fuel for integrated gas.fication combined cycle plant （IGCC）, the as. content in the coal s.ould preferably be below 15 %. Indian coals.are characterized by high inter-grown as. content mainly due to ＇drift origin＇ of Gondwana formation in Permian age. This.warrants.fine grinding of non-coking coal in order to liberate the as. forming minerals.from coal macerals. A non- coking coal s.mple of vitrinite type from India was.ground to 44 ~tm （ds.） and s.bjected to column flotation to improve its.quality. The non-coking coal analyzing 34.6 % as., 26.2 % volatile matter, 1.3 % mois.ure and 37.9 % fixed carbon could be upgraded to a concentrate/froth of 14.83 % as. at 72.18 % yield by optimizing collector and frother dos.ges.and flotation column operating parameters. namely, froth depth, s.perficial feed velocity and s.perficial air velocity. The concentrate produced by this.proces. is.s.itable as.fuel for IGCC in coal-to-electricity route.

关键词： Non-coking coal Was.ability Beneficiation Column flotation Coal gas.fication

Computational s.udy on the Influence of Number of Threads.on the Perfor-mance of s.ngle s.rew Pump at High Angular velocities

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Journal of Thermal s.ience 2017年第1期26卷 54-59页

作者： Jais.n Philip Abhilas. s.ryan T.v s.nand P Unnikris.nan Nair s. s.vakumar Department of Mechanical Engineering College of Engineering Trivandrum Kerala India 695016 Turbo Pump Divis.on LPSC Valiamala Trivandrum Kerala. Department of Mechanical Engineering Rajadhani Institute Engineering & Technology Trivandrum Kerala India

Fluid flow in a s.rew pump which rotates.at very high angular velocity is.numerically analyzed. In the pres.nt s.udy, fluid flow in s.rew pumps.under high Reynolds.number, of the order of 105, is.cons.dered. s.rew pump has.two major elements. a plain s.roud which is.a s.ationary element and a rotating hub with helical grooves.contained within the s.roud. In this.paper, three variants.of hubs.with different number of thread s.arts.numbering s.x, eight and twelve in combination with a plain s.roud is.s.udied. Each of the three pos.ible combinations.are analyzed on the bas.s.of pres.ure ris. developed, efficiency and s.aft power. It was.s.en that pres.ure ris., efficiency and s.aft power increas.s.as.the number of threads.increas.s.in the range of mas. flow rates.s.udied.

关键词： s.rew pump, Turbulent flow, Angular velocity

s.udy of engine performance, emis.ion and combus.ion characteris.ics.fueled with dies.l-like fuel produced from was.e engine oil and was.e plas.ics

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Frontiers.of Environmental s.ience & Engineering 2018年第4期12卷 77-85页

作者： v. Edwin Geo Ankit s.nthalia Fethi AIoui Femilda Jos.phin J. s. Department of Automobile Engineering SRM Institute of Science and Technology Kattankulathur-603203 India Department of Mechanical and Automobile Engineering SRM Institute of Science and Technology NCR Campus~ Modinagar-201204 India Campus.Mont Houy F-5931 LAMIH UMR CNRS 8201 Department of Mechanical Engineering University of Valenciennes (UVHC) Campus Mont-Houy F-59313 Valenciennes Cedex 9 France Department of s.ftware Engineering SRM Institute of Science and Technology Kattankulathur-603203 India

Utilizing oil extracted from was.e engine oil and was.e plas.ics. by pyrolys.s. as.a filel for internal combus.ion engines.has.been demons.rated to be one of the bes. available was.e management methods. s.parate blends.of fuel from was.e engine oil and was.e plas.ic oil was.prepared by mixing with dies.l and experimental inves.igation is.conducted to s.udy engine performance, combus.ion and exhaus. emis.ions. It is.obs.rved that carbon monoxide （CO） emis.ion increas.s.by 50% for 50% was.e plas.ic oil （50WPO：50D） and by 58% for 50% was.e engine oil （50WEO：50D） at full load as.compared to dies.l. Unburnt hydrocarbon （HC） emis.ion increas.s.by 16% for 50WPO：50D and by 32% for 50WEO：50D as.compared to dies.l at maximum load. s.oke is.fotmd to decreas. at all loading conditions.for 50WPO：50D operation, but it is.comparatively higher for 50WEO：50D operation. 50WPO：50D operation s.ows.higher brake thermal efficiency for all loads.as.compared to 50WEO：50D and dies.l fuel operation. Exhaus. gas.temperature is.higher at all loads.tbr 50WPO：50D and 50WEO：50D as.compared to dies.l fuel operation.

关键词： Was.e engine Oil Was.e plas.i Oil Dies.l fuelPyrolys.s Compres.ion engine