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Influence of RTA treatment on the physical properties of well-aligned ZnO nanorods
Reddy, N.K.,Ahsanulhaq, Q.,Hahn, Y.B. North-Holland 2009 Physica E, Low-dimensional systems & nanostructure Vol.41 No.3
Well-aligned zinc oxide (ZnO) nanorod structures were grown on ZnO-coated (seed layer) glass substrates using a simple and low-cost aqueous solution method at a growth temperature of ∼70<SUP>o</SUP>C. The physical properties were examined at room temperate using appropriate techniques. After preliminary analysis, the structures were heat treated at different temperatures varying from 300 to 800<SUP>o</SUP>C using the rapid thermal annealing technique under N<SUB>2</SUB> environment for 1min and investigated the influence of annealing effect on their physical properties. The as-grown ZnO nanorods are slightly zinc-rich in nature and exhibited hexagonal wurtzite structure. These nanorods are uniformly grown along the [001] direction and their average length and diameter are found to be ∼1.0μm and ∼85nm, respectively. While increasing annealing temperature, the oxygen content and crystallinity of the ZnO nanorods increased up to 600<SUP>o</SUP>C, and above this temperature, the oxygen content increased continuously whereas the crystallinity of the nanorods decreased. The electrical resistivity of nanostructures slightly increased with the increase of annealing temperature probably due to the damage in their columnar structure.
Sreekantha Reddy, D.,Kang, B.,Yu, S.C.,Dwarakanadha Reddy, Y.,Sharma, S.K.,Gunasekhar, K.R.,Rao, K.N.,Sreedhara Reddy, P. Elsevier 2009 Current Applied Physics Vol.9 No.2
Nanostructured Zn<SUB>1-x</SUB>Mn<SUB>x</SUB>S films (0=<x=<0.25) were deposited on glass substrates by simple resistive thermal evaporation technique. All the films were deposited at 300K in a vacuum of 2x10<SUP>-6</SUP>m bar. All the films temperature dependence of resistivity revealed semiconducting behaviour of the samples. Hot probe test revealed that all the samples exhibited n-type conductivity. The nanohardness of the films ranges from 4.7 to 9.9GPa, Young's modulus value ranging 69.7-94.2GPa.
D. Sreekantha Reddy,강병원,유성초,Y. Dwarakanadha Reddy,S.K. Sharma,K.R. Gunasekhar,K.N. Rao,P. Sreedhara Reddy 한국물리학회 2009 Current Applied Physics Vol.9 No.3
Nanostructured Zn1-xMnxS films (0 ≼ x ≼ 0.25) were deposited on glass substrates by simple resistive thermal evaporation technique. All the films were deposited at 300 K in a vacuum of 2 × 10-6 m bar. All the films temperature dependence of resistivity revealed semiconducting behaviour of the samples. Hot probe test revealed that all the samples exhibited n-type conductivity. The nanohardness of the films ranges from 4.7 to 9.9 GPa, Young’s modulus value ranging 69.7–94.2 GPa.
Seismic performance evaluation of mid-rise shear walls: experiments and analysis
Y.M. Parulekar,G.R. Reddy,R.K. Singh,N. Gopalkrishnan,G.V. Ramarao 국제구조공학회 2016 Structural Engineering and Mechanics, An Int'l Jou Vol.59 No.2
Seismic performance evaluation of shear wall is essential as it is the major lateral load resisting member of a structure. The ultimate load and ultimate drift of the shear wall are the two most important parameters which need to be assessed experimentally and verified analytically. This paper comprises the results of monotonic tests, quasi-static cyclic tests and shake-table tests carried out on a midrise shear wall. The shear wall considered for the study is 1:5 scaled model of the shear wall of the internal structure of a reactor building. The analytical simulation of these tests is carried out using micro and macro modeling of the shear wall. This paper mainly consists of modification in the hysteretic macro model, developed for RC structural walls by Lestuzzi and Badoux in 2003. This modification is made by considering the stiffness degradation effect observed from the tests carried out and this modified model is then used for nonlinear dynamic analysis of the shear wall. The outcome of the paper gives the variation of the capacity, the failure patterns and the performance levels of the shear walls in all three types of tests. The change in the stiffness and the damping of the wall due to increased damage and cracking when subjected to seismic excitation is also highlighted in the paper.
Montmorillonite Clay Catalyzed Three Component, One-Pot Synthesis of 5-Hydroxyindole Derivatives
Reddy, B.V. Subba,Reddy, P. Sivaramakrishna,Reddy, Y. Jayasudhan,Bhaskar, N.,Reddy, B. Chandra Obula Korean Chemical Society 2013 Bulletin of the Korean Chemical Society Vol.34 No.10
A highly efficient and environmentally benign protocol has been developed for the first time to produce a wide range of biologically active 5-hydroxyindole derivatives using montmorillonite KSF clay as a reusable solid acid catalyst. The use of recyclable clay makes this procedure quite simple, more convenient and cost-effective.
Chemical and Biological Aspects of the Sponge Genus Dyside , A Review
Y. Venkateswarlu,P. Ramesh,N. Srinivasa Reddy 한국생약학회 1998 Natural Product Sciences Vol.4 No.3
The chemical constituents anti their biological activities of the sponge genus Dysidea has been reviewed.
A New Oxygenated Furano Sesquiterpene from the Sponge Dysidea fragilis
Y. Venkateswarlu,N. Srinivasa Reddy,P. Ramesh 한국생약학회 1998 Natural Product Sciences Vol.4 No.3
A new oxygenated furano sesquiterpene [1] has been isolated from the sponge Dysidea fragilis collected from Mandapam coast, Tamilnadu, India and its structure was determined by analysis of spectral data.
Veeranarayana Reddy, M.,Chandra Sekhar Reddy, G.,Thi Kim Lien, N.,Kim, D.W.,Jeong, Y.T. Pergamon Press 2017 Tetrahedron Vol.73 No.10
A facile and efficient method for the synthesis of benzo[4,5]imidazo[1,2-a]pyrimidines has been achieved via highly active and reusable heterogeneous poly acrylic acid-supported layered double hydroxides (PAA-g-LDHs) catalyst promoted one-pot reaction of 1H-benzo[d]imidazol-2-amine, with α,β-unsaturated carbonyl compounds under solvent-free conditions. PAA-g-LDHs catalyst was successfully synthesized via reversible addition-fragmentation chain-transfer polymerization using grafting reaction and was characterized by different analytical techniques. The significant features of this reaction include expedient one-pot process, short reaction time, excellent yields, wide substrate scope and operational simplicity. Also, the catalyst could be reused for several consecutive runs without any apparent loss in its catalytic activity.