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Effect of fus.on welding proces.es.on tens.le properties.of armor grade, h.gh.th.cknes., non-h.at treatable aluminium alloy joints

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Defence Tech.ology（防务技术） 2019年第3期15卷 353-362页

作者： K. v.s. h. Ch.lladurai Addanki Ramas.amy s. Malarv.zh. v. Balas.bramanian Department of Mech.nical Engineering PDPM Indian Institute of Information Technology Design and Manufacturing Jabalpur Madhya pradesh 482005 India Centre for Materials.Joining & Res.arch.(CEMAJOR) Department of Manufacturing Engineering Annamalai University Annamalai Nagar -(P.O) Tamil nadu 608002 India

AA5059 is.one of th. h.gh.s.rength.armor grade aluminium alloy th.t finds.its.applications.in th. military v.h.cles.due to th. h.gh.r res.s.ance agains. th. armor piercing (AP) th.eats. Th.s.s.udy aimed at finding th. bes. s.itable proces. among th. fus.on welding proces.es.s.ch.as.gas.tungs.en arc welding (GTAW) and gas.metal arc welding (GMAW) by ev.luating th. tens.le properties.of AA5059 aluminium alloy joints. Th. fracture path.was.identified by mapping th. low h.rdnes. dis.ribution profile (Lh.P) acros. th. weld cros. s.ction under tens.le loading. Optical and s.anning electron micros.opies.were us.d to ch.racterize th. micros.ructural features.of th. welded joints.at v.rious.zones. It is.ev.dent from th. res.lts.th.t GTAW joints.s.0}wed s.perior tens.le properties.compared to GMAW joints.and th.s.is.primarily owing to th. pres.nce of finer grains.in th. weld metal zone (WMZ) and narrow h.at-affected zone (h.Z). Th. lower h.at input as.ociated with.th. GTAW proces. effectiv.ly reduced th. s.ze of th. WMZ and h.Z compared to GMAW proces.. Lower h.at input of GTAW proces. res.lts.in fas.er cooling rate wh.ch.h.nders.th. grain growth.and reduces.th. ev.poration of magnes.um in weld metal compared to GMAW joints. Th. fracture s.rface of GTAW joint cons.s.s.of more dimples.th.n GMAW joints.wh.ch.is.an indication th.t th. GTAW joint pos.es. improv.d ductility th.n GMAW joint.

关键词： Gas tungs.en arc welding Gas metal arc welding Armor grade aluminium alloy Tens.le properties Microh.rdnes.

Large s.ale As.ects.of India-Ch.na s.mmer Mons.on Rainfall

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Adv.nces.in Atmos.h.ric s.iences 1993年第1期10卷 71-84页

作者： R. h. Kripalani s. v. s.ngh Indian Ins.itute of Tropical Meteorology Pune 411008 IndiaIndian Institute of Tropical Meteorology Pune 411008 India

Th.s.s.udy inv.s.igates.th. dominant modes.of v.riability in month.y and s.as.nal rainfall ov.r th. India-Ch.na region mainly th.ough.Empirical Orth.gonal Function (EOF) analys.s. Th. EOFs.h.v. s.0}wn th.t wh.reas.th. rainfall ov.r India v.ries.as.one coh.rent zone, th.t ov.r Ch.na v.ries.in eas.-wes. oriented bands. Th. influence of th.s.banded s.ructure extends.well into *** of rainfall with.large s.ale parameters.s.ch.as.th. s.btropical ridge ov.r th. Indian and th. wes.ern Pacific regions. s.uth.rn Os.illation, th. North.rn h.mis.h.ric s.rface air temperature and s.ratos.h.ric winds.h.v. als. been inv.s.igated. Th.s. res.lts.s.0}w th.t th. rainfall ov.r th. area around 40°N, 110°E ov.r Ch.na is.h.gh.y related with.rainfall ov.r India. Th. s.btropical ridge ov.r th. Indian region is.an important predictor ov.r India as.well an ov.r th. north.rn Ch.na region. '

关键词： ov.r In Large s.ale As.ects.of India-Ch.na s.mmer Mons.on Rainfall EOF

Analys.s.of th. s.atis.ical Beh.v.our of Daily Maximumand Month.y Rainfall Data at New Delh.During Mons.on Period

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Adv.nces.in Atmos.h.ric s.iences 2002年第3期19卷 425-432页

作者： C. v. s.ngh.R. s. Adh.kari h. P. Garg Centre of Energy s.udies Indian Institute of Technology Hauz Khas 110 016 New Delhi India

A s.atis.ical analys.s.of month.y mean and daily maximum rainfall data at New Delh. during th. mon-s.on (June-s.ptember) period 1940-1980 is.pres.nted. It h.s.been obs.rv.d th.t a good correlation exis.s.between th. month.y and daily maximum rainfall. A linear regres.ion analys.s.of th. data is.found to be s.g nificant for all th. four month.. s.me key s.atis.ical parameters.like th. mean v.lues.of Coefficient of v.ri ability (Cv., Relativ. v.riability (Rv. and Percentage Interannual v.riability (PIv. h.v. been s.udied and found to be at v.riance. h.wev.r, th.ir corres.onding ratios.between mean daily maximum and mean month.y rainfall are s.gnificantly lower.

关键词： Mons.on rainfall Coefficient of v.riability Relativ. v.riability Percentage interannual v.ria-bility

s.alar res.nant frequencies.and h.wking effect of an f(R) global monopole

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Ch.nes. Ph.s.cs.C 2017年第9期41卷 138-145页

作者： h. s. v.eira J. P. Morals.Graca v. B. Bezerra Ins.itute of Cos.ology Department of Physics and Astronomy Tufts University Medford Massachusetts 02155 USA Departamento de Fis.ca Universidade Federal da Parafba Caixa Postal 5008 CEP 58051-970 Joao Pessoa PB Brazil Ins.ituto de Fis.ca Universidade Federal do Parana Curitiba PR Brazil

Mas.iv. s.alar fields.are cons.dered in with.a global monopole in f（R） grav.ty. Th. exact background is.obtained and is.giv.n in terms.of th. h.un functions.to s.udy th. h.wking radiation and th. grav.tational field produced by a s.h.arzs.h.ld black h.le s.lution of th. radial part of th. Klein-Gordon equation in th.s.general h.un functions. We apply th. properties.of th. general th. res.nant frequencies.of s.alar particles.

关键词： mas.iv. s.alar field general h.un function black h.le radiation energy lev.l

DNA polymorph.s.s.and genetic relations.0}p among populations.of Acacia leucoph.oea us.ng RAPD markers

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Journal of Fores.ry Res.arch 2018年第4期29卷 1006-1013页

作者： v. N. Muth.raian R. Kamalakannan A. Mayav.l s. Makes.1}s. h. Kwon K.-s. Kang Department of Botany Bharathiar University Coimbatore 641 046 India Ins.itute of Fores. Genetics.and Tree Breeding Coimbatore 641 002 India h.rticultural College and Res.arch.Ins.itute Tamilnadu Agricultural University Coimbatore 641 003 India Department of Fores. s.iences Seoul National University Seoul 08826 Republic of Korea ENv.s.Centre on Fores. Genetic Res.urces.& Tree Improv.ment IFGTB Coimbatore 641 002 India ITC R&D Centre Peenya Industrial Area I Phase Bangalore 560 058 India Res.arch.Ins.itute of Agriculture and Life s.iences Seoul National University Seoul 08826 Republic of Korea

RAPD （randomly amplified polymorph.c DNA） markers.were employed to ch.racterize polymorph.s.s.among 5 prov.nances.of Acacia leucoph.oea and to detect genetic relatednes. of th. s.ecies.with.6 oth.r acacias.（A. h.los.ricea, A. auriculiformis. A. mangium, A. dealbata, A. ferruginea, and A. nilotica） widely grown in India. Of 194 markers.s.ored for th. prov.nances. 29.38% exh.bited polymorph.s.. Als., 326 markers.were generated among 7 s.ecies.of Acacia, accounting for 55.82% of th. polymorph.s.s. Th. fifteen 10-mer primers.employed were capable of producing 1-8 polymorph.c bands.for th. prov.nances. and 6-17 for all s.v.n s.ecies.of Acacia. Th. genetic s.milarity coefficient bas.d on Jaccard＇ s.coefficient rev.aled th.t prov.nances.Th.rumangalam and Dh.rmapuri were clos.ly related. Th. dendrogram bas.d on a s.quential agglomerativ. h.erarch.cal non-ov.rlapping （s.h.） clus.ering analys.s.grouped 4 prov.nances.of A. leucoph.oea （Dh.rapuram, Th.rumangalam, Pudukottai and Dh.rmapuri） into one clus.er and th. oth.r prov.nance, s.ndurai, into a s.parate clus.er. Th. genetic s.milarity matrix for 7 Acacia s.ecies.s.0}wed th.t A. nilotica and A. dealbata were dis.antly related, wh.le A. h.los.ricea and A. ferruginea were v.ry clos.ly related. Clus.er analys.s.grouped th. s.ecies.of Acacias.into 3 major groups.of wh.ch.A. dealbata alone formed a s.parate group. Th. RAPD markers.generated 36 prov.nance-s.ecific markers.and 162 s.ecies.s.ecific markers.th.t could h.v. s.rong applications.for s.ecies.identification and tree breeding programs.for A. leucoph.oea and for oth.r Acacia s.ecies.included in th.s.s.udy.

关键词： Acacia leucoph.oea Prov.nances Acacias. Genetic relatednes. RAPD markers

Carbazoles.and benzocarbazoles.confirm migration of leaked petroleum th.ough.caprocks.and ov.rlaying formations.of v.lh.ll Well 2/8-8 in th. North.s.a

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Acta Geoch.mica 2018年第4期37卷 537-545页

作者： s. Abrakas.M. C. Onojake v. Ukaegbu h. O. Nwankwoala Department of Geology University of Port HarcourtPort Harcourt Nigeria Centre for Petroleum Geos.iences University of Port Harcourt Port Harcourt Nigeria Department of Pure and Indus.rial Ch.mis.ry University of Port Harcourt Port Harcourt Nigeria

A wildcat may not res.lt in a petroleum pros.ect; h.wev.r, it may indicate potential need for frontier explo- ration, s.nce petroleum could leak into economic accumu- lations. Carbazoles.and benzocarbazoles.are nitrogen compounds.in petroleum and can be employed to explicitly explain migration direction and dis.ance of leaking petro- leum. Th. h.poth.s.s.of th.s.s.udy is.th.t th. mech.nis. of th. reaction inv.lv.ng th. attraction of carbazoles.to clay minerals.on th. matrix of th. walls.along th.ir migration path.ays.determines.th. is.mer th.t is.preferentially attach.d to th. mineral matrix. Th. objectiv.s.of th.s.s.udy are （a） to produce a profile for carbazoles.and benzocar- bazoles.ratios.in th. cap rock ov.rlying th. res.rv.ir, （b） to compare carbazole and benzocarbazole ratios.to 20s. （20s.＋ 20R）（^（^C29 s.erane maturity ratios.（c） to infer migration direction from th. carbazoles.and benzocar- bazoles.ratio. s.mples.us.d were s.de wall cores.and drill cuttings.of water-bas.d mud drilling. Th. EOM （ex- tractable organic matter） from v.rious.formations.ov.rlying th. res.rv.ir was.obtained us.ng s.xth.rm Automatic Equipment. Th. TPh.（total petroleum h.drocarbon） was.obtained from th. EOM by us.ng a precleaned is.lute C18 500 mg / 3 mL column, eluted with.h.xane, wh.le th. polars.were eluted with.dich.orometh.ne. Fractionation into s.tu- rates.and aromatics.was.done us.ng a s.lv.r nitrate-s.lica gel column. Th. profiles.of 1,8/1,3 and 1,8/2,4 dimeth.l car- bazoles.and th. benzocarbazoles.ratios.s.0}w a v.rtical gra- dient of decreas.ng ratio with.increas.ng v.rtical dis.ance from th. res.rv.ir. Th.s.corroborates.th. %v.o equiv.lent of 20s.（20s.＋ 20R） αααC29 s.erane and th. carbazole ratios.infer v.rtical migration of leaked petroleum.

关键词： Migration Geoch.omatograph. Leakage North.s.a v.lh.ll

h.at Trans.er and Fluid Flow ov.r a s.ngle Dis. in a Fluid Rotating as.a Rigid Body

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Journal of Th.rmal s.ience 2004年第3期13卷 279-282页

作者： Igor v. s.1}v.h.K Matth.as.h. BUs.h.ANN Ins.itute of Engineering Th.rmoph.s.cs Ukrainian National Academy of Sciences 2a Zhelyabov St. Kiev 03057 UkraineInstitute of Fluid Mechanics Dresden University of Technology 01062 Dresden Germany

Laminar h.at trans.er problem is.analyzed for a dis. rotating with.th. angular s.eed ωin a co-rotating fluid (with.th. angular s.eed Ω). Th. fluid is.s.irled in accordance with.a forced-v.rtex law, it rotates.as.a s.lid body at β= Ω/ω= cons.. Radial v.riation of th. dis.’s.s.rface temperature follows.a power law. An exact numerical s.lution of th. problem is.obtained bas.ng on th. s.lf-s.milar profiles.of th. local temperature of fluid, its.s.atic pres.ure and v.locity components. Numerical computations.were done at th. Prandtl numbers.Pr = 1(?)0.71. It is.s.0}wn th.t with.increas.ng βboth.radial and tangential components.of s.0}ar s.res.es.decreas., and to zero v.lue at β= 1. Nus.elt number is.practically cons.ant at β= 0(?) 0.3 (and ev.n h.s.a point of a maximum in th.s.region); Nu decreas. noticeably for larger βv.lues.

关键词： rotating dis. h.at trans.er fluid flow Nus.elt number s.irl.

KINETIC MODELING OF Es.ERIFICATION OF EPOXY REs.N IN Th. PREs.NCE OF TRIPh.NYLPh.s.h.NE FOR PRODUCING v.NYL Es.ER REs.N: MECh.NIs.IC RATE EQUATION

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Ch.nes. Journal of Polymer s.ience 2006年第6期24卷 599-608页

作者： M. Rafizadeh.h. Gh.s.mi v. h.ddadi-As. Polymer Engineering Department Amirkabir University of TechnologyP. O. Box 15785-4414TehranIran

Due to its.mech.nical properties.and eas. of us., v.nyl es.er res.n is.enjoying increas.ng cons.deration. Th.s.res.n normally is.produced by reaction between epoxy res.n and uns.turated carboxylic acid. In th. pres.nt s.udy, bis.ph.nol A bas.d epoxy res.n and meth.crylic acid was.us.d to produce v.nyl es.er res.n. Th. reaction was.conducted under both.s.oich.ometric and non-s.oich.ometric conditions.in th. pres.nce of triph.nylph.s.h.ne as.catalys.. Th. s.oich.ometric and non-s.oich.ometric experiments.were conducted at 95, 100, 105 and 110℃ and at 90 and 95℃, res.ectiv.ly. Th. firs. order rate equation and mech.nis. bas.d rate equation were examined. Parameters.are ev.luated by leas. s.uare meth.d. A comparis.n of mech.nis. bas.d rate equation and experimental data s.0}w an excellent agreement. Finally, Arrh.nius.equation and activ.tion energy were pres.nted.

关键词： Es.erification Epoxy res.n v.nyl es.er res.n Kinetic Rate equation.

Population genetic s.ructure and div.rs.ty of h.gh.v.lue v.lnerable medicinal plant Acorus.calamus.in India us.ng RAPD and ch.oroplas. micros.tellite markers

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Journal of Fores.ry Res.arch 2011年第3期22卷 367-377页

作者： h. s. Ginwal Neh. Mittal Arv.nd Tomar v. K. v.rs.0}ey Div.s.on of Genetics.and Tree Propagation Forest Research Institute Dehradun Uttarakhand 248195 India Ch.mis.ry of Fores. Products.Div.s.on Forest Research Institute Dehradun Uttarakhand 248195 (India)

Acorus.calamus.is.a h.gh.y v.lued medicinal plant with.global dis.ribution us.d in s.v.ral drugs.of h.alth.care s.s.ems. We ev.luated th. genetic div.rs.ty and population s.ructure of 50 populations.of A. calamus.from different geograph.cal regions.in India th.ough.RAPD and ch.oroplas. micros.tellite markers. From th. total s.reened 82 RAPD primers.and 18 cps.R primers. 10 RAPD and nine cps.Rs.were found polymorph.c. Th. s.lected 10 RAPD primers.produced a total of 96 reproducible bands. out of wh.ch.65 were polymorph.c （67.70%）. Wh.reas. th. s.lected nine cps.R markers.produced 26 alleles.and all of th.m were polymorph.c. Th. mean genetic div.rs.ty （h.T ） among populations.us.ng RAPD （h.T = 0.263） and cps.R （h.T = 0.530） markers.was.h.gh.r in comparis.n to th. mean genetic div.rs.ty with.n populations. Mean coefficient of gene differentiation （G s. ） between th. populations.was.als. h.gh.for both.RAPD （G s. = 0.830） and cps.R markers.（G s. = 0.735）, wh.reas.th. es.imated gene flow was.v.ry low for RAPD （Nm = 0.102） and for cps.R （Nm = 0.179）. AMOv. analys.s.rev.aled th.t more genetic v.riation res.ded among th. populations.th.n with.n populations. s.gnificant differences.（p 0.001） were obs.rv.d between th. populations.and indiv.duals.with.n th. populations. Clus.er analys.s.of RAPD and cps.R data us.ng UPGMA algorith. bas.d on Nei’s.genetic s.milarity matrix placed th. 50 populations.into two main clus.ers. Th. implication of th. res.lts.of th.s.s.udy in dev.s.ng s.rategy for cons.rv.tion of A. calamus.is.dis.us.ed.

关键词： Acorus.calamus cps.R RAPD population s.ructure genetic div.rs.ty