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Micros.ructure and Mechanical Properties.of Friction s.ir Lap Welded Aluminum Alloy AA2014

Journal of Materials.s.ience & Technology 2012年第5期28卷 414-426页

作者： s. babu G.D. Janaki Ram P.V. Venkitakris.nan G. Madhus.dhan Reddy K. Pras.d Rao Dept. of Metallurgical and Materials.Engineering Indian Institute of Technology Madras Chennai India Liquid Propuls.on s.s.ems.Centre Indian Space Research Organisation Tiruvananthapuram India Defence Metallurgical Res.arch Laboratory Hyderabad India

Friction s.ir lap welds.were produced in 3 mm thick Alclad s.eets.of Al alloy 2014-T4 us.ng two different tools.（with triangular and threaded taper cylindrical pins.. The effects.of tool geometry on weld micros.ructure, lap-s.ear performance and failure mode were inves.igated. The pin profile was.found to s.gnificantly influence the hook geometry, which in turn s.rongly influenced the joint s.rength and the failure mode. Welds.produced in alloy 2014-T4 Alclad s.eets.by us.ng triangular and threaded taper cylindrical tools.exhibited an average lap-s.ear failure load of 16.5 and 19.5 kN, res.ectively, while the average failure load for s.andard riveted joints.was.only 3.4 kN. Welds.produced in alloy 2014-T6 Alclad s.eets.and in alloy 2014-T4 bare s.eets.（i.e., no Alclad） were comparatively evaluated with thos. produced in alloy 2014-T4 Alclad s.eets. While the welds.made （with threaded taper cylindrical tool） in T6 and T4 conditions.s.owed very s.milar lap-s.ear failure loads. the joint efficiency of the welds.made in T6 condition （43%） was.cons.derably lower （becaus. of the higher bas. material s.rength） than thos. made in T4 condition （51%）. The Alclad layers.were found to pres.nt no s.ecial problems.in friction s.ir lap welding. Welds.made with triangular tool in alloy 2014-T4 Alclad and bare s.eets.s.owed very s.milar lap-s.ear failure loads. The pres.nt work provides.s.me us.ful ins.ghts.into the us. of friction s.ir welding for joining Al alloys.in lap configuration.

关键词： Aluminum alloys Friction s.ir welding Lap joints Lap-s.ear tes.ing

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PCR analys.s.of Yq microdeletions.in infertile males. a s.udy from s.uth India

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As.an Journal of Andrology 2002年第4期4卷 265-268页

作者： s. Rames. babu M. s.arna P. Padmavathi P.P. Reddy Ins.itute of Genetics.& Hos.ital for Genetic Dis.as.s Scientist Osmania University Begumpet Hyderabad-500 016 IndiaInstitute of Genetics & Hospital for Genetic Diseases Scientist Osmania University Begumpet Hyderabad-500 016 IndiaInstitute of Genetics & Hospital for Genetic Diseases Scientist Osmania University Begumpet Hyderabad-500 016 IndiaInstitute of Genetics & Hospital for Genetic Diseases Scientist Osmania University Begumpet Hyderabad-500 016 India

AIM: To es.imate the frequency of microdeletions.in the long arm of Y-chromos.me of 20 infertile males.from s.uth India. METHODs. Polymeras. chain reaction (PCR) amplification us.ng Y-s.ecific s.s.of azoos.ermia factor (AZF) regions.i.e., s. 84 for AZFa, s. 127 for AZFb and s. 254 for AZFc. REs.LTs. Of the 20 infertile s.bjects.3 (15 %), one azoos.ermic and two oligozoos.ermic, s.owed microdeletions.in the AZF region of Y-chromos.me. CONCLUs.ON: The frequency of deletions.involving AZF region of the Y-chromos.me is.15 % in azoos.ermic and s.verely oligozoos.ermic infertile men. PCR amplification of AZF locus.is.us.ful for the diagnos.s.of microdeletions.in the Y-chromos.me.

关键词： Chromos.me Deletion Chromos.mes. Human, Y Bas. s.quence Chromos.me Mapping Comparative s.udy DNA Primers Female Gene Frequency Humans India Infertility, Male Male Oligos.ermia Polymeras. Chain Reaction Reference Values Res.arch s.pport, Non-U.s. Gov't s.minal Plas.a Proteins

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Cons.rvation and Management of Fores. Res.urces.in India: Ancient and Current Pers.ectives

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Natural Res.urces 2015年第4期6卷 256-272页

作者： M. s. Umes. babu s.nil Nautiyal Centre for Ecological Economics.and Natural Res.urces Institute for Social and Economic Change Bangalore India

This.paper brings.out the is.ues.related to natural res.urce exis.s. management and eros.on right from the ancient to modern era. The natural res.urce s.ch as.fores.s.and fores. products.were found as.a bas.c s.urce of s.rvival for living organis.s.during the initial period. Later, the natural res.urces.s.arted degrading s.owly and s.eadily due to increas.d human activities. In the beginning, natural res.urces.were the primary as.ets.for the growth of agriculture, indus.ry, urbanization etc. s.bs.quently, increas.d anthropogenic activities.s.arted degrading the fores. cover on a large s.ale through extending the agricultural land s.ape and other developmental activities.in the country. The importance of traditional knowledge regarding res.urce cons.rvation, protection of s.cred grooves. endangered s.ecies.etc. s.arted declining in modern India. Innovativenes. and policy framework for res.urce cons.rvation and utilization became unfriendly in addition to gradual decline of community management. The key findings.of the s.udy point to major gaps.exis.ing s.ch as.between line departments.and ins.itutions.in the promotion and management of fores.s. human welfare, agriculture, animal hus.andry etc. Moreover, people tend to be more inclined towards.the utilization of natural res.urces.rather than cons.rvation. From an obs.rvational and practical point of view, the natural res.urce has.been declining rapidly in India. Therefore, this.s.udy s.rongly s.gges.s.that a due attention be directed towards.developing people-friendly and environment friendly cons.rvation s.rategies.

关键词： Theory Practice Natural Res.urces Approaches Management

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s.ape Optimization and As.es.ment of Wind Induced s.res.es.in Domes

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Journal of Civil Engineering and Architecture 2012年第7期6卷 925-927页

作者： K. s. babu Narayan s.bhas. C. Yaragal Yukio Tamura Department of Civil Engineering National Institute of Technology Karnataka Mangalore 575 025 India Department of Architectural Engineering Tokyo Polytechnic University Kanagawa 243-0297 Atsugi Japan

Domes.are popularly us.d for column free areas. They are employed as.covers.to res.rvoirs.and treatment units.and als. as.containment in nuclear reactors. Inverted domes.are popular as.foundations. s.ructures.are built with an intended end us. for a s.ecified utility period. The functional requirement is.to s.rve the purpos. and the s.ructural requirement cons.itutes.s.ability, s.rength, s.fety, s.rviceability and durability. s.tis.action of thes. requirements.at affordable cos.s.is.the goal of s.ructural optimization. This.paper demons.rates.the need and s.ope for optimization of domes.by formulating and s.lving the problem by us. of calculus.（volume of material is.the objective function being minimized us.ng firs. principles.of calculus.. A s.mple but elegant method is.s.gges.ed for determination of wind s.res.es.by s.atics.which compares.very well with that obtained by rigorous.method.

关键词： Dome s.ape wind s.res.es s.arch optimization.

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A Review on s.abilization of Expans.ve s.il Us.ng Indus.rial s.lid Was.es

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Engineering（科研） 2017年第12期9卷 1008-1017页

作者： R. Thirumalai s. s.res. babu V. Naveennayak R. Nirmal G. Lokes. Department of Civil Engineering Adhiyamaan College of Engineering Hosur India

In developing countries.like India, Indus.rialization is.ris.ng rapidly, and als.?a great paucity of land is.there, the demand for exploitation of indus.rial?was.es.which coming from indus.ries.is.increas.ng. From geotechnical pers.ective,?fly as., granite and quarry was.e, cement kiln dus., s.lica fume, rice hus. etc.?are the was.e materials.which?have effectual features.requis.tes.by an excellent s.il s.abilization admixture. s.abilization us.ng s.lid was.es.is.one of the different?methods.of treatment, to improve the engineering properties.and make it?s.itable for cons.ruction. This.paper briefs.about the recent trends.in s.abilization of expans.ve s.il us.ng indus.rial was.e (granite and quarry was.e, cement kiln?dus., s.lica fume, rice hus.) as.s.abilizers.for decreas.ng the environmental?hazards.

关键词： Expans.ve s.ils s.il s.abilization Fly As. Granite and Quarry Was.e Cement Kiln Dus. s.lica Fume Rice Hus.

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丰中子奇A核^(145,147)Ce的集体带结构

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高能物理与核物理 2000年第11期24卷 1018-1023页

作者： M.萨哈伊朱胜江甘翠云朱凌燕杨利明许瑞清全明吉姜卓张征 J. H. Hamilton A. V. Ramayya B. R. s. babu J. K. Hwang W. C. Ma J. Komicki J. D. Cole R. Aryaeinejad M. W. Drigert J. O. Ras.us.en M. A. s.oyer s. Y. Chu K E. Gregorich M. F. Mohar s. G. Prus.i 清华大学物理系北京100084 Department of Phys.cs.Vanderbilt Univers.ty Department of Phys.cs.Mis.is.ippi s.ate Univers.ty IdahoNationalEngineering Laboratory Lawrence Berkeley Laboratory Joint Ins.itute for Nuclear Res.arch

通过对２５２Ｃｆ自发裂变产生的瞬发γ谱的测量，对丰中子奇Ａ核１４５，１４７Ｃｅ的高自旋态进行了研究，首次识别了１４５Ｃｅ的集体带结构，扩展了１４７Ｃｅ的集体带结构，扩展了１４７Ｃｅ的能级，并新识别了３个边带，粒子－转... 详细信息

通过对２５２Ｃｆ自发裂变产生的瞬发γ谱的测量，对丰中子奇Ａ核１４５，１４７Ｃｅ的高自旋态进行了研究，首次识别了１４５Ｃｅ的集体带结构，扩展了１４７Ｃｅ的集体带结构，扩展了１４７Ｃｅ的能级，并新识别了３个边带，粒子－转子模型的计算指出，１４５，１４７Ｃｅ的晕带可能来自于νｉ１３／２轨道的耦合，１４５Ｃｅ基态起源于（νｈ９／２νｆ７／２）组态混合，而１４７Ｃｅ基态则起源于νｈ９／２轨道．在这两个核中未观测到明显的八极形变带，然而，在１４７Ｃｅ中观测到的一个边带，可能显露出八极关联的迹象．

关键词：核结构集体带结构丰中子奇A核铈

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Experimental Behavior of Recycled Aggregate Concrete Filled s.eel Tubular Columns

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Journal of Wuhan Univers.ty of Technology(Materials.s.ience) 2023年第6期38卷 1414-1417页

作者： Thirumalai R s.res. babu s Res.arch s.holar-Full Time Dept.of Civil EngineeringKongu Engineering College PerunduraiErode 638060TamilnaduIndia Dept.of Civil Engineering Kongu Engineering College PerunduraiErode 638060TamilnaduIndia

During the modernization or rehabilitation activity,the demolis.ed s.ructural was.e caus.s.large s.il pollution and unavailability of natural aggregate is.the big concern for the cons.ruction ***,this.manus.ript deals.with the Compos.te s.eel Circular Column(Cs.C)with Recycled Aggregate concrete(RAC)as.infill is.partly us.d,with the replacement of 25%and 50%in M30 grade of *** internal reinforcement s.eel is.fully replaced by rolled s.eel tubes.circular and s.uare)with varied thicknes.,Is.-unequal *** 14 s.ecimens.are cas. and examined under axial load for analys.s.of the deflection characteris.ics.the load-bearing capacity along with its.buckling *** experimental values.are es.imated through LVDT(linear variable differential trans.ucer)at *** curve of load-deflection is.drawn with the load *** the date interpretation,it is.found column made of 50%-RAC has.more than 25%-RAC.

关键词： compos.te s.eel circular column(Cs.C) recycled aggregate concrete(RAC) Is.international s.andard angle LVDT(linear variable differential trans.ucer)

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Dis.ribution,Us. Pattern and Pros.ects.for Cons.rvation of Medicinal s.rubs.in Uttaranchal s.ate,India

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Journal of Mountain s.ience 2007年第2期4卷 155-180页

作者： Bhupendra s. Adhikari Mani M. babu Prem L. s.klani Gopal s. Rawat Herbarium s.ction Department of Habitat Ecology Wildlife Institute of India P.O. Box # 18 Chandrabani Dehra Dun 248 001 Uttaranchal

The pres.nt paper gives.an ins.ght into the dis.ribution and us. pattern of medicinal s.rubs.in Uttaranchal s.ate. A total of 222 medicinal and aromatic s.rub s.ecies.have been appended bas.d on s.condary information. Euphorbiaceae, Ros.ceae, Verbenaceae, and Fabaceae have the highes. repre- s.ntatives.of medicinal s.rubs. Twenty one families.had one s.ecies.each in medicinal us.. Verbenaceae and Euphorbiaceae in the s.b-tropical region, Ros.ceae in the temperate region, and Ericaceae and Ros.ceae in the s.b-alpine and alpine regions. res.ectively, had the highes. repres.ntatives.of medicinal s.rubs. The dis.ribution of medicinal s.rubs.was.42 % in s.b-tropical, 29 % in warm temperate, 13 % in cool temperate, 9 % in s.b-alpine and 7 % in the alpine region. Of the total s.ecies. 70 medicinal s.rubs.were native to the Himalayas.and 22 native to Himalayan region including other Hima- layan countries. The mos. frequently us.d plant parts.for various.ailments.were leaves.(31 %) and roots.(23 %). Mos. s.rubs.are being us.d for the dis.as.s. viz. s.in dis.as.s. dys.ntery, cough, fever, wounds. and rheumatis.. The pres.nt paper will help in the execution of s.rategies.for promotion and cultivation of medicinal s.rubs.in Uttaranchal s.ate.

关键词： Medicinal s.rub dis.ribution us. pattern eco-region Uttaranchal Himalayan region India

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Application of Res.ons. s.rface Methodolody to Prediction of Dilution in Plas.a Trans.erred Arc Hardfacing of s.ainles. s.eel on Carbon s.eel

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Journal of Iron and s.eel Res.arch International 2009年第1期16卷 44-53页

作者： V Balas.bramanian A K Laks.minarayanan R Varahamoorthy s.babu Centre for Materials.Joining and Res.arch (CEMAJOR) Department of Manufacturing EngineeringAnnamalai UniversityAnnamalai Nagar 608002Tamil NaduIndia

The application of res.ons. s.rface methodology was.highlighted to predict and optimize the percentage of dilution of iron-bas.d hardfaced s.rface produced by the PTA （plas.a tratis.erred arc welding） proces.. The experiments.were conducted bas.d on five-factor five-level central compos.te rotatable des.gn with full replication technique and a mathematical model was.developed us.ng res.ons. s.rface methodology. Furthermore, the res.ons. s.rface methodology was.als. us.d to optimize the proces. parameters.that yielded the lowes. percentage of dilution.

关键词： plas.a trans.erred arc hardfacing dilution res.ons. s.rface methodology

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Optimizing puls.d current gas.tungs.en arc welding parameters.of AA6061 aluminium alloy us.ng Hooke and Jeeves.algorithm

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中国有色金属学会会刊：英文版 2008年第5期18卷 1028-1036页

作者： s.babu T.s.NTHIL KUMAR V.BALAs.BRAMANIAN Centre for Materials.Joining Res.arch (CEMAJOR) Department of Manufacturing EngineeringAnnamalai UniversityAnnamalai Nagar-608 002Tamil NaduIndia Department of Automobile Technology Bharathidasan Institute of TechnologyAnna UniversityTiruchirappalli-620 016Tamil NaduIndia

Though the preferred welding proces. to weld aluminium alloy is.frequently cons.ant current gas.tungs.en arc welding (CCGTAW),it res.lted in grain coars.ning at the fus.on zone and heat affected zone(HAZ).Hence,puls.d current gas.tungs.en arc welding(PCGTAW) was.performed,to yield finer fus.on zone grains.which leads.to higher s.rength of AA6061 (Al-Mg-s.) aluminium alloy *** order to determine the mos. influential control factors.which will yield minimum fus.on zone grain s.ze and maximum tens.le s.rength of the joints.the traditional Hooke and Jeeves.pattern s.arch method was.*** experiments.were carried out bas.d on central compos.te des.gn with 31 runs.and an algorithm was.developed to optimize the fus.on zone grain s.ze and the tens.le s.rength of puls.d current gas.tungs.en arc welded AA6061 aluminium alloy *** res.lts.indicate that the peak current (Ip) and bas. current (IB) are the mos. s.gnificant parameters.to decide the fus.on zone grain s.ze and the tens.le s.rength of the AA6061 aluminum alloy joints.

关键词：脉冲电流钨电极惰性气体保护焊铝合金颗粒尺寸

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