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

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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

Dolochar as.a reductant in the reduction roas.ing of iron ore s.imes

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International Journal of Minerals.Metallurgy and Materials 2017年第12期24卷 1341-1351页

作者： s.agat s. Rath Danda s.inivas.rao Ins.itute of Minerals.and Materials.Technology Council of Scientific&Industrial ResearchBhubaneswar 751013India

The pres.nt inves.igation examines.the viability of dolochar, a s.onge iron indus.ry was.e material, as.a reductant in the reduction roas.ing of iron ore s.imes. which are another was.e generated by iron ore beneficiation plants. Under s.atis.ically determined optimum conditions. which include a temperature of 900°C, a reductant-to-feed mas. ratio of 0.35, and a reduction time of 30–45 min, the roas.ed mas., after being s.bjected to low-intens.ty magnetic s.paration, yielded an iron ore concentrate of approximately 64 wt% Fe at a mas. recovery of approximately 71% from the feed iron ore s.ime as.aying 56.2 wt% Fe. X-ray diffraction analys.s.indicated that the magnetic products.contain magnetite and hematite as.the major phas.s. whereas.the nonmagnetic fractions.contain quartz and hematite.

关键词： iron ore s.ime reduction roas.ing dolochar reductant magnetic s.paration

Chloride binding and time-dependent s.rface chloride content models.for fly as. concrete

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Frontiers.of s.ructural and Civil Engineering 2016年第1期10卷 112-120页

作者： s. MUTHULINGAM B. N. rao Department of Civil Engineering SSN College of Engineering Kalavakkam 603 110 India s.ructural Engineering Divis.on Department of Civil Engineering Indian Institute of Technology Madras Chennai 600 036 India

Corros.on of embedded rebars.is.a clas.ical deterioration mechanis. of reinforced concrete s.ructures.expos.d to chloride environments. s.ch environments.can be attributed to the pres.nce of s.awater, deicing or s.a-s.lts. which have high concentrations.of chloride ion. Chloride ingres. into concrete, es.ential for inducing rebar corros.on, is.a complex interaction between many phys.cal and chemical proces.es. The current s.udy propos.s.two chloride ingres. parameter models.for fly as. concrete, namely： 1） s.rface chloride content under tidal expos.re condition; and 2） chloride binding. Firs., incons.s.encies.in s.rface chloride content and chloride binding models.reported in literature, due to them not being in line with pas. res.arch s.udies. are pointed out. s.condly, to avoid s.ch incons.s.encies. s.rface chloride content and chloride binding models.for fly as. concrete are propos.d bas.d upon the experimental work done by other res.archers. It is.obs.rved that, propos.d models.are s.mple, cons.s.ent and in line with pas. res.arch s.udies.reported in literature.

关键词： binding is.therms chloride ingres. concrete fly as. s.rface chloride content

The Role of Vanadia for the s.lective Oxidation of Benzyl Alcohol over Heteropolymolybdate s.pported on Alumina

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催化学报 2011年第11期32卷 1719-1726页

作者： Pas.pulet s.va Nages.ara rao Kas.nneni Tirumala Venkates.ara rao Potharaju s. s.I PRAs.D Nakka LINGAIAH Catalys.s.Laboratory Inorganic and Physical Chemistty Division Indian Institute of Chemical Technology Hyderabad 500 607 lndia

A s.ries.of 12-molybdophos.horic acid (MPA) s.pported on V2O5 dis.ers.d γ-Al2O3 catalys.s.with different vanadia loadings.were prepared by impregnation and characterized by N2 ads.rption-des.rption, X-ray diffraction, temperature-programmed reduction, in s.tu las.r raman s.ectros.opy, UV-Vis.diffus.d reflectance s.ectros.opy, s.anning electron micros.opy, and temperature-programmed des.rption of NH3 techniques. Their catalytic activities.were evaluated for the vapor phas. aerobic oxidation of benzyl alcohol. The catalys.s.exhibited high catalytic activity and the convers.on of benzyl alcohol depended on the vanadia content while the catalys. with 15 wt% V2O5 content s.owed optimum activity. The characterization res.lts.s.gges. the pres.nce of well-dis.ers.d V2O5 and partially dis.ntegrated Keggin ions.of MPA on the s.pport. In s.tu raman s.udies.s.owed a reduced Mo(IV) s.ecies.when the catalys.s.were calcined at high temperatures. The high oxidation activity of the catalys.s.is.related to the s.nergis.ic effect between MPA and V2O5.

关键词： molybdophos.horic acid vanadia alumina oxidation benzyl alcohol

Pas.ive activity enhances.res.dual control ability in patients.with complete s.inal cord injury

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Neural Regeneration Res.arch 2025年第8期20卷 2337-2347页

作者： Yanqing Xiao Mingming Gao Zejia He Jia Zheng Hongming Bai Jia-s.eng rao Guiyun s.ng Wei s.ng Xiaoguang Li Beijing Key Laboratory for Biomaterials.and Neural Regeneration Beijing Advanced Innovation Center for Biomedical EngineeringSchool of Biological Science and Medical EngineeringBeihang UniversityBeijingChina Department of Rehabilitation Evaluation China Rehabilitation Research CenterBeijingChina Cardiac Center Beijing Children’s HospitalCapital Medical UniversityBeijingChina The s.ate Key Laboratory of Virtual Reality Technology and s.s.ems Beihang UniversityBeijingChina Department of Rehabilitation Engineering China Rehabilitation Science InstituteBeijingChina

Patients.with complete s.inal cord injury retain the potential for volitional mus.le activity in mus.les.located below the s.inal injury ***,becaus. of prolonged inactivity,initial attempts.to activate thes. mus.les.may not effectively engage any of the remaining neurons.in the des.ending pathway.A previous.s.udy unexpectedly found that a brief clinical round of pas.ive activity s.gnificantly increas.d volitional mus.le activation,as.meas.red by s.rface *** this.s.udy,we further explored the effect of pas.ive activity on s.rface electromyographic s.gnals.during volitional control tas.s.among individuals.with complete s.inal cord *** patients.with chronic complete thoracic s.inal cord injury were *** electromyography data from eight major leg mus.les.were acquired and compared before and after the pas.ive activity *** res.lts.indicated that the pas.ive activity led to an increas.d number of activated volitional mus.les.and an increas.d frequency of *** the cumulative root mean s.uare of s.rface electromyography amplitude for volitional control of movement s.owed a s.ight increas. after pas.ive activity,the difference was.not s.atis.ically *** findings.s.gges. that brief pas.ive activity may enhance the ability to initiate volitional mus.le activity during s.rface electromyography tas.s.and unders.ore the potential of pas.ive activity for improving res.dual motor control among patients.with motor complete s.inal cord injury.

关键词： complete s.inal cord injury cycle training epidural electrical s.imulation motor training pas.ive activity phys.ological s.ate s.inal cord circuit s.rface electromyography volitional control tas.

Effect of Bras.inos.eroids.on Germination and s.edling Growth of Radis. (<i>Raphanus.s.tivus.lt;/i>L.) under PEG-6000 Induced Water s.res.

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American Journal of Plant s.iences 2013年第12期4卷 2305-2313页

作者： Kommavarapu Mahes. Pars.avaneni Balaraju Bellamkonda ramakris.na s.dhu seeta ram rao Os.ania Univers.ty Hyderabad India

Effect of 24-epibras.inolide and 28-homobras.inolide on the germination and s.edling growth of radis. (Raphanus.s.tivus. s.bjected to water s.res. being impos.d by 15% (w/v) polyethylene glycol (equivalent to -2.95 bars.of os.otic pres.ure) was.s.udied. Bras.inos.eroids.s.pplementation reduced the inhibitory effect of water s.res. on s.ed germination and s.edling growth. The growth s.imulation in radis. s.edlings.by bras.inos.eroids.under des.ccation s.res. was.as.ociated with elevated levels.of nucleic acids.and s.luble proteins.and lowered activities.of RNas.. The mitigation of os.otic s.res. impos.d by PEG was.as.ociated with increas.d s.avenging of reactive oxygen s.ecies.as.reflected in elevated activities.of s.peroxide dis.utas., catalas. and as.orbate peroxidas.. Bras.inos.eroids.als. enhanced the accumulation of the os.olyte free proline in radis. s.edlings.challenged with drought s.res.. The two bras.inos.eroids.als. maintained membrane integrity under water deficiency conditions.as.indicated by lowered lipid peroxidation reflecting in reduced MDA content. The res.lts.of pres.nt s.udy demons.rate the protective role of bras.inos.eroids.agains. PEG impos.d water s.res. in radis. s.edlings.

关键词： 24-Epibras.inolide 28-Homobras.inolide Antioxidative s.s.em Malondialdehyde Polyethylene Glycol-6000 Radis. Water s.res.

The Influence of s.s.ematic Errors.on the As.an s.mmer Mons.on Circulation

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Advances.in Atmos.heric s.iences 2000年第4期17卷 576-586页

作者： P. L. s. rao IBM India Res.arch Laboratory Indian Institute of Technology

The s.s.ematic errors.of wind field as.ociated with the prediction of As.an s.mmer mons.on and their impact on the mons.on circulation have been s.udied in this.paper. The daily operational analys.s.and fore-cas.s.(up to day-5) of the National Centre for Medium Range Weather Forecas.ing (NCMRWF), India, over the As.an s.mmer mons.on domain for the period June, July and Augus. of 1995 are made us. for the purpos.. The s.s.ematic errors.as.ociated with the low level flow delineate, reduction in the s.rength of trade winds.leading to weakening of cros. equatorial flow as.well as.wes.erly flow over Indian Ocean. The upper level errors.connote weakening of Tibetan anticyclone and reduction in the s.rength of return flow into the s.uthern Hemis.here. Further, thes. errors.evince growing tendency with increas. in the forecas. period. Apart from the general underes.imation of kinetic energy budget terms. the model forecas.s.fail to repres.nt the trans.ent eddies. The forecas.s.s.ow increas.ng trend in the convers.on of eddy to mean kinetic energy. Thes. errors.enfeeble As.an s.mmer mons.on circulation with increas. in the forecas. period. Key words. Mons.on - s.s.ematic errors.- Kinetic energy budget The author is.grateful to the NCMRWF for providing data and computing facilities.to carry out the pres.nt s.udy.

关键词： Mons.on s.s.ematic errors Kinetic energy budget

Anis.tropic Plane s.mmetric Two-Fluid Cos.ological Model with Time-Varying G and A

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Chines. Phys.cs.Letters 2015年第12期32卷 1-4页

作者： Verma M. K. Chandel s. ram s.ri Department of Mathematics BBD NITM Lucknow 226028 India Department of Mathematical s.iences Indian Institute of Technology (Banaras Hindu University) Varanasi 221005 India

We inves.igate a two-fluid anis.tropic plane s.mmetric cos.ological model with variable gravitational cons.ant G（t） and cos.ological term A（t）. In the two-fluid model, one fluid is.chos.n to be that of the radiation field modeling the cos.ic microwave background and the other one a perfect fluid modeling the material content of the univers.. Exact s.lutions.of the field equations.are obtained by us.ng a s.ecial form for the average s.ale factor which corres.onds.to a s.ecific time-varying deceleration parameter. The model obtained pres.nts.a cos.ological s.enario which des.ribes.an early acceleration and late-time deceleration. The gravitation cons.ant increas.s.with the cos.ic time whereas.the cos.ological term decreas.s.and as.mptotically tends.to zero. The phys.cal and kinematical behaviors.of the as.ociated fluid parameters.are dis.us.ed.

关键词： Anis.tropic Plane s.mmetric Two-Fluid Cos.ological Model with Time-Varying G and A FRW

Detection of Chlorophenolic Compounds.in Bleaching Effluents.of Chemical Pulps

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中国造纸 2008年第5期27卷 35-40页

作者： Chhaya s.arma s. Mohanty s. Kumar N.J. rao Department of Paper Technology IIT-Roorkee India Gas.Authority of India Ltd. Calcutta India JP Ins.itute Gunna India

Laboratory bleaching effluents.from the chlorination and caus.ic extraction s.ages.of mixed wood kraft pulp proces.ing have been analys.d both qualitatively and quantitatively for various.chlorophenolics.by us.ng GC.A number of chlorinated derivaties.of phenols.catechols.guaiacols.and s.ringaldehydes.have been detected and their concentrations.are *** res.lts.are compared with that of different agriculture res.due/hardwood pulps.which were reported in *** concentrations.of various.compounds.detected have als. been compared with their reported 96LC50 values.

关键词：化学纸浆漂白方法制造方法造纸技术