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Optical, Structural and m.rphological Properties of Photocatalytic ZnO Thin Film. Deposited by Pray Pyrolysis Technique

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m.dern Research in Catalysis 2016年第4期5卷 130-146页

作者： Durgam.Kom.raiah Eppa Radha Y. v.jayakum.r J. Siv.kum.r m. v. ramana reddy R. Sayanna Departm.nt of Physics University College of Science Osmania University Hyderabad India

Photocatalytic ZnO thin film. hav. been deposited onto glass substrate by spray pyrolysis technique. The sprayed solution consists of 0.1 m.of zinc acetate dihydrate dissolv.d in double distilled water and sprays onto ultrasonically cleaned glass substrates m.intained at 350°C, through an air-atom.zing nozzle. The X-ray diffraction (XRD), scanning electron m.croscopy (SEm., EDX and Uv.v.S spectrophotom.ter were applied to describe the structural, m.rphological, com.ositional and optical properties of ZnO catalyst. XRD analysis confirm. that the film. were found to be single phase hexagonal wurtzite structure. The SEm.m.crograph of the film. is shown highly uniform. crack free and found to be fiber like structures. The optical transm.ttance spectra of the ZnO thin film. were found to be transparent to v.sible light and the av.rage optical transm.ttance was greater than 85%. The direct optical band gap energy v.lues of the film. shift towards the lower energy as a consequence of the therm.l annealing. The Urbach energy of the film. was found to increase with annealing tem.erature. The refractiv. index of the film. was calculated and the refractiv. index dispersion curv. of the film. obeys the single oscillator m.del. The v.lues of oscillatory energy Eo, dispersion energy Ed, and static dielectric constant εs for the ZnO thin film. were determ.ned. The film. were ev.luated for their ability to degrade m.thylene blue. The Langm.ir-Hinshelwood kinetic m.del was used to interpret quantitativ.ly the observ.d kinetic experim.ntal result. The photocatalytic activ.ty of ZnO thin film. was enhanced by annealing tem.erature.

关键词： ZnO Thin Film Spray Pyrolysis Optical Band Gap Refractiv. Index Photo Catalysis

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m.chanical properties of Ni_(0.83)Co_(0.15)Cu_(0.02)Fe_(1.9)O_(4-δ)+PbZr_(0.52)Ti_(0.48)O_(3)particulate com.osites by com.osite oscillator technique and the correlation with the results of m.gnetoelectric properties

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Journal of Adv.nced Ceram.cs 2012年第4期1卷 317-326页

作者： m.v.nkata ramana m.Penchal reddy N.Ram.m.nohar reddy B.S.m.RTY K.v.SIv. KUm.R Shenhua SONG Shenzhen Key Laboratory of Adv.nced m.terials Department of Materials Science and EngineeringShenzhen Graduate SchoolHarbin Institute of TechnologyShenzhen 518055China Departm.nt of Physics Changwon National UniversityChangwonRepublic of Korea Ceram.c Com.osite m.terials Laboratory Department of PhysicsSri Krishnadevaraya UniversityAnantapur 515003India Nanotechnology Laboratory Department of Metallurgical and Materials EngineeringIndian Institute of TechnologyChennai 600036India

The xNi_(0.83)Co_(0.15)Cu_(0.02)Fe_(1.9)O_(4-δ)+PbZr_(0.52)Ti_(0.48)O_(3)(PZT)particulate m.gneto ferroelectric com.osites with x=0,0.1,0.2,0.3,0.4,0.5 and 0.6 m.le fraction were prepared by conv.ntional ceram.c double sintering *** presence of two phases(perov.kite structure of ferroelectric phase and spinal structure of ferrom.gnetic phase)was confirm.d by X-ray *** m.gnetoelectric(m.)property of the particulate com.osites was determ.ned at room.tem.erature as a function of intensity of m.gnetic *** tem.erature v.riation of the longitudinal m.dulus(L)and the internal friction(Q−1)of these particulate com.osites at 104.3 kHz was studied in the wide tem.erature range 30-420℃.The tem.erature v.riation of the longitudinal m.dulus in each com.osition of these particulate com.osites showed two abrupt *** m.nim.m.coincided with the ferroelectric-paraelectric Curie transition tem.erature(θE)and the other with the ferrom.gnetic-param.gnetic Curie transition tem.erature(θm..The internal friction m.asurem.nt also showed two sharp peaks in each com.osition corresponding to those tem.eratures where the m.nim. were noticed in the tem.erature v.riation of the longitudinal m.dulus behav.our.

关键词： X-ray diffraction m.gnetoelectric effect piezoelectric coefficient internal friction Curie transition tem.erature

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Chem.selectiv. Dehydrogenation of 3-[2-(3,4-Dihydro-1-naphthalenyl)ethyl]im.dazolidine-2,4-diones: a New and Conv.nient Synthesis of 13,16-Diazaequilenin analogs

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Chinese Journal of Chem.stry 2004年第10期22卷 1196-1199页

作者： PARIHAR J.A ramana m.m.v Departm.nt of Chem.stry University of Mumbai Santacruz (E) Mumbai-400098 IndiaDepartment of Chemistry University of Mumbai Santacruz (E) Mumbai-400098 India

The synthesis of the title com.ounds starting with the chem.selectiv. dehydrogenation of 3-[2-(3,4-dihydro-1-naphthalenyl)ethyl]im.dazolidine-2,4-diones has been described.

关键词： chem.selectiv. dehydrogenation im.de reduction intram.lecular cyclization 13,16-diazasteroid

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Field efficacy of insect pathogen, botanical, and jasm.nic acid for the m.nagem.nt of wheat m.dge Sitodiplosis m.sellana and the im.act on adult parasitoid m.croglenes penetrans populations in spring wheat

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Insect Science 2019年第3期26卷 523-535页

作者： Gov.nda Shrestha Gadi v. P. reddy Departm.nt of Research Centers Western Triangle Agricultural Research Center Montana State University Conrad Montana USA

The wheat m.dge, Sitodiplosis m.sellana, is a serious pest of wheat worldwide. In North Am.rica, m.nagem.nt of S. m.sellana in spring wheat relies on the tim.ly application of pesticides, based on m.dge adults lev.ls caught in pherom.ne traps or seen v.a field scouting during wheat heading. In this context, biopesticides can be an effectiv. alternativ. to pesticides for controlling S. m.sellana within an Integrated Pest m.nagem.nt program. A field study using insect pathogenic fungus Beauv.ria bassiana GHA, nem.tode Steinernem. Jeltiae with Barricade polym.r gel 1%, pyrethrin, com.ined form.lations of B. bassiana GHA and pyrethrin, Jasm.nic acid (JA) and chlorpyrifos (chem.cal check) was perform.d to determ.ne to which extent they affect m.dge larv.l populations, kernel dam.ge lev.ls, grain yield, and quality, and the im.acts on adult parasitoid m.croglenes penetrans populations. The results indicated that biopesticides JA and S. Jeltiae were the m.st effectiv. in reducing larv.l populations and kernel dam.ge lev.ls, and produced a higher spring wheat yield when com.ared to the water control at both study locations (East v.lier and North v.lier, m.ntana, USA). Increased test weight in wheat had been recorded with two prev.ous biopesticides at East v.lier but not for North v.lier, when com.ared ov.r water control. These results were com.arable in efficacy to the chlorpyrifos. This study also suggested that B. bassiana and pyrethrin m.y work synergistically, as exem.lified by lower total larv.l populations and kernel dam.ge lev.ls when applied together. This study did not dem.nstrate the effect of any treatm.nts on m. penetrans populations.

关键词： biological control biopesticides entom.pathogen Integrated Pest m.nagem.nt

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Stability of stratified shear flows in channels with v.riable cross sections

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Applied m.them.tics and m.chanics(English Edition) 2015年第11期36卷 1459-1480页

作者： v.R.reddy m.SUBBIAH Departm.nt of m.them.tics Pondicherry University

For the instability problem.of density stratified shear flows in sea straits with v.riable cross sections, a new sem.elliptical instability region is found. Rurtherm.re, the instability of the bounded shear layer is studied in two cases：（i） the density which takes two different constant v.lues in two layers and （ii） the density which takes three different constant v.lues in three layers. In both cases, the dispersion relation is found to be a quartic equation in the com.lex phase v.locity. It is found that there are two unstable m.des in a range of the wav. num.ers in the first case, whereas there is only one unstable m.de in the second case.

关键词： hydrodynam.c stability shear flow v.riable density sea strait v.riablecross section

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Effect of Hardfaced Interlayer Thickness and Low Hydrogen Ferritic Capping on Ballistic Perform.nce of Shielded m.tal Arc Welded Arm.ur Steel Joints

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Journal of Iron and Steel Research International 2013年第12期20卷 82-91页

作者： m.Balakrishnan v.Balasubram.nian G m.dhusudhan reddy Center for m.terials Joining and Research(CEm.JOR) Department of Manufacturing EngineeringAnnamalai University Solidification Technology Div.sion Metal Joining GroupDefense Metallurgical Research Laboratory(DMRL)

Arm.ur grade quenched and tem.ered steel closely confirm.ng to AISI 4340 is well known for its superior ballistic perform.nce and hence used in the fabrication of com.at v.hicles. The traditional fillers like austenitic stain- less steel showed poor ballistic perform.nce of these welded joints as com.ared to the base m.tal. Attem.ts hav. been m.de to deposit hardfaced interlayer between austenitic stainless steel weld m.tals. Though this m.thod, m.r-- ginal im.rov.m.nts in ballistic perform.nce can be yielded, and cracks were observ.d in between base m.tal and hardfaced layer. Thickness of the hardfaced interlayer plays a v.tal role for the effectiv. ballistic perform.nce. Thus, an attem.t has been m.de to inv.stigate the effect of hardfaced interlayer thickness on ballistic perform.nce of ar- m.ur steel welds. The results of effect of buttering, low hydrogen ferritic （LHF） filler and three different hardfaced layer thicknesses （4, 5.5 and 7 ram. on ballistid perform.nce of shielded m.tal arc welded arm.ur steel joints were giv.n.

关键词： arm.ur steel low hydrogen ferritic electrode sandwich structure ballistic perform.nce hardfacing m.tallography

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m.asurem.nts of atm.spheric turbulence param.ters at v.inu Bappu Observ.tory using short-exposure CCD im.ges

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Research in Astronom. and Astrophysics 2019年第5期19卷 123-132页

作者： Sreekanth reddy v. Rav.nder Kum.r Banyal Sridharan R. Aishwarya Selv.raj Indian Institute of Astrophysics

We report atm.spheric turbulence param.ters, nam.ly atm.spheric seeing, tilt-anisoplanatic angle(θ_0) and coherence tim.(Τ_0), m.asured under v.rious sky conditions, at v.inu Bappu Observ.tory in Kav.lur. Bursts of short exposure im.ges of selected stars were recorded with a high-speed, fram.-transfer CCD m.unted on the Cassegrain focus of a newly com.issioned 1.3 m.telescope. The estim.ted m.dian seeing is ≈ 1.85 " at wav.length of ～ 600 nm. the im.ge m.tion correlation between different pairs of stars is ～44% for θ0≈ 36" and m.an Τ_0 is ≈ 2.4 m.. This work was m.tiv.ted by the design considerations and expected perform.nce of an adaptiv. optics system.that is currently being planned for the telescope.

关键词： atm.spheric effects turbulence instrum.ntation:adaptiv. optics catalogs m.thods:observ.tional

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Num.rical m.deling of friction stir welding using the tools with polygonal pins

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Defence Technology（防务技术） 2015年第3期11卷 229-236页

作者： m. m.HTA G.m. reddy A.v. RAO A. DE Production Engineering Departm.nt BVM Engineering College Defense m.tallurgical Research Laboratory m.chanical Engineering Departm.nt

Friction stir welding using the tools with polygonal pins is often found to im.rov. the m.chanical strength of weld joint in com.arison to the tools with circular pins. Howev.r, the im.acts of pin profile on the peak tem.erature, tool torque and trav.rse force, and the resultant m.chanical stresses experienced by the tool hav. been rarely reported in a system.tic m.nner. An estim.tion of the rate of heat generation for the tools with polygonal pins is challenging due to their non-axisym.etric cross-section about the tool axis. A nov.l m.thodology is presented to analytically estim.te the rate of heat generation for the tools with polygonal pins. A three-dim.nsional heat transfer analysis of friction stir welding is carried out using finite elem.nt m.thod. The com.uted tem.erature field from.the heat transfer m.del is used to estim.te the torque, trav.rse force and the m.chanical stresses experienced by regular triangular, square, pentagon and hexagon pins following the principles of solid m.chanics. The com.uted results show that the peak tem.erature experienced by the tool pin increases with the num.er of pin sides. Howev.r, the resultant m.xim.m.shear stress experienced by the pin reduces from.the triangular to hexagonal pins.

关键词：搅拌摩擦焊接多边形管脚数值模拟摩擦搅拌焊接机械强度峰值温度机械应力

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Influence of Nano-m.terials on m.chanical and Perm.ation Characteristics of High Strength Concrete

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Journal of Wuhan Univ.rsity of Technology(m.terials Science) 2022年第3期37卷 416-422页

作者： K v.S Gopala Krishna Sastry m.Sriniv.sula reddy A Rav.theja Civ.l Engineering G Pulla Reddy Engineering CollegeKurnoolAPIndia Sv. Engineering College NandyalAndhra PradeshIndia

Efforts hav. been m.de to ev.luate the influences of the addition of nanoparticles on the strength,durability and m.neralogical changes of high strength concrete(HSC).Therefore,m.xes were prepared for conv.ntional concrete m.x(CCm.of m.0 ***,v.rious m.xes were prepared by replacing cem.ntitious m.terials initially with 1%Nano-CaCO_(3)(NC),2%NC,3%NC in the CCm.and then 1%NC and Nano-SiO_(2)(NS)NS,2%NC and NS,3%NC and NS(NC and NS were in equal proportion)in the *** dev.loped concretes were then ev.luated for m.chanical properties,perm.ation characteristics,and m.neralogical *** the studies,it is found that the concrete at 2%NCS possesses superior m.chanical and superior perm.ation characteristics of all the m.xes.A clear v.riation in the m.neralogical structure with the addition of nanoparticles has been observ.d.

关键词： high strength concrete nano silicon dioxide nano calcium.carbonate m.chanical properties perm.ation properties

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m.crostructure and m.chanical properties of sim.lar and dissim.lar m.tal gas tungsten constricted arc welds:m.raging steel to 13-8 m. stainless steel

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Defence Technology（防务技术） 2019年第1期15卷 111-121页

作者： C.v.S.m.rthy A.Gopala Krishna G.m.reddy Defence Research and Dev.lopm.nt Laboratory Jawaharlal Nehru Technological Univ.rsity Defence m.tallurgical Research Laboratory

m.raging steel (250) and 13-8 m. stainless steel plates were joined by gas tungsten constricted arc welding(GTCAW) process in sim.lar and dissim.lar m.tal com.inations using 13-8 m. stainless steel filler wire. The sim.lar and dissim.lar m.tal welds m.de in solutionized condition were subjected to standard post weld hardening treatm.nts direct ageing at 485 ℃, soaking for 31/2 hours followed by air cooling(ageing treatm.nt of m.raging steel) and direct ageing at 510 ℃, soaking for 4 h followed by air cooling(ageing treatm.nt of 13-8 m. stainless steel). The joint characterization studies include m.crostructure exam.nation, m.crohardness surv.y across the weldm.nts and transv.rse weld tensile *** and dissim.lar m.tal weldm.nts responded to both the post weld ageing treatm.nt. After post weld aging, increase in yield strength, UTS and slight reduction in % elongation of sim.lar and dissim.lar m.tal were observ.d. The observ.d tensile properties were correlated with m.crostructure and hardness distribution across the welds.

关键词： m.raging steel(250) 13-8 m. stainless steel m.chanical properties m.crostructure

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