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Phase dependent magnetic properties of Ni-Au alloy nanowires
Prasad, R.V.S.,Hyun An, B.,Shin, Y.,Tak Jeon, I.,Suh, J.Y.,Keun Kim, Y.,Choi, I.S. North-Holland 2014 Materials Letters Vol.116 No.-
Binary alloy nanowires of mutually immiscible Ni-Au system are synthesized by electrodeposition method. Here, we incorporate the concept of alloy design into nanowires to effectively engineer and control the magnetic properties of nanowires. Saturation magnetization and coercivity values of as-deposited Ni-Au alloy nanowires strongly correlate with either the phases present or to the dissolution of gold to nickel. The magnetic properties, however, were significantly affected upon annealing, which is correlated with the structural evolution of a weakly magnetic metastable hcp-Ni phase. We report here the detailed investigation on phase transformations in Ni-Au alloy nanowires and their effect on magnetic properties.
Sivakumar Subramanian,A. S. Sekhar,B. V. S. S. S. Prasad 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.6
Leakage characteristics, influenced by centrifugal and thermal radial growth are determined computationally for a generic rotating labyrinthseal used in the gas turbine secondary air system. Three seal locations, namely, R25, R50 and R75 are represented by means ofvarying the rotor radius mimicking different radial positions of the seal from the shaft axis. The combined influence of seal location andits radial (Centrifugal and thermal) growth on the leakage performance is investigated for a wide-ranging speeds from 1000 to 3000 rad/s,temperatures ranging from 200 to 450 oC and pressure ratios varying from 1.1 to 2.5, for a chosen initial clearance of 500 micron. Acomparison of the effect of rotation and temperature gradient among different rotors shows that the radial growth and leakage flow ratessignificantly vary with the increasing radius.
Reddy, K.R.,Karthik, K.V.,Prasad, S.B.B.,Soni, S.K.,Jeong, H.M.,Raghu, A.V. Pergamon Press 2016 Polyhedron Vol.120 No.-
<P>An organo-inorganic photocatalytic nanocomposite material based on conjugated polymer, polyaniline (PANI) with titanium dioxide (TiO2) nanoparticles has been developed by performing in situ chemical oxidative polymerization of aniline with ammonium persulfate (APS) oxidant in the presence of hydrothermally synthesized TiO2 nanoparticles. The structural and morphological properties of TiO2/PANI nanocomposites were analyzed by transmission electron microscopy (TEM), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR), respectively. The TEM results of the TiO2/PANI nanocomposites showed that TiO2 nanoparticles of 5-10 nm of sizes are dispersed in the PANI matrix. FT-IR spectra show that the TiO2/PANI nanocomposites are almost identical to the structure of PANI alone. The photocatalytic activities of the nanocomposites were evaluated by the photocatalytic degradation of Rhodamine B (RhB), Methylene Blue (MB) and phenol in the presence of UV-light irradiation. The composite catalysts exhibited higher photocatalytic activity for the degradation of organic pollutants than unmodified TiO2 nanoparticles, which is due to sensitizing effect of PANI. (C) 2016 Published by Elsevier Ltd.</P>
On the Development of Lofts for Doubly Curved Sheet Metal Components
Prasad, K.S.R.K.,Selvaraj, P.,Ayachit, Praveen V.,Nagamani, B.V. Society for Computational Design and Engineering 2006 International Journal of CAD/CAM Vol.6 No.1
Practical automated flat pattern generation with inbuilt production features for doubly curved sheet metal components (SMCs) is addressed here utilizing a new and unique Point Transformation Algorithm (PTA). This is the third in the series of papers on practical Flat Pattern Development (FPD) [8] and Production Loft Generation Systems (PLGS) [9] complementing the pioneering work [6,7]. In the first two publications, automated loft generation programs have addressed sheet metal components having a Principal Flat Surface (PFS) only. The flat pattern development of 3-D components that do not have the flat surface(termed as Non-PFS components) having complex features of double curvature in addition to cutouts and nibbled holes typical of aircraft components were so far not addressed due to lack of relevant published algorithms. This paper traces the evolution of developments and provides the record of fully illustrated, automated loft generation scheme for aircraft SMCs including the Non-PFS components which underwent validation through production tests by sponsors. Details of some of the unique features of the system like simplified surface model generation, termed as topological model and powerful algorithms deployed with potential for CAD/CAM applications are included.
Prasad K. Krishna,Mohan S. Venkata,Bhaskar Y. Vijaya,Ramanaiah S. V.,Babu V. Lalit,Pati B. R.,Sarma P. N. The Microbiological Society of Korea 2005 The journal of microbiology Vol.43 No.3
The feasibility of laccase production by immobilization of Pleurotus ostreatus 1804 on polyurethane foam (PUF) cubes with respect to media composition was studied in both batch and reactor systems. Enhanced laccase yield was evidenced due to immobilization. A relatively high maximum laccase activity of 312.6 U was observed with immobilized mycelia in shake flasks compared to the maximum laccase activity of free mycelia (272.2 U). It is evident from this study that the culture conditions studied, i.e. biomass level, pH, substrate concentration, yeast extract concentration, $Cu^{2+}$ concentration, and alcohol nature, showed significant influence on the laccase yield. Gel electrophoretic analysis showed the molecular weight of the laccase produced by immobilized P. ostreatus to be 66 kDa. The laccase yield was significantly higher and more rapid in the packed bed reactor than in the shake flask experiments. A maximum laccase yield of 392.9 U was observed within 144 h of the fermentation period with complete glucose depletion.
M.B. Rajendra Prasad,Parvin S. Tamboli,Ravi V. Ingle,Kiran D. Diwate,Prashant K. Baviskar,B.R. Sankpal,K.C. Mohite,Sandesh R. Jadkar,Habib M. Pathan 한국물리학회 2017 Current Applied Physics Vol.17 No.12
Geometrical thickness of photoelectrode is one of the important design considerations that can substantially improve the device performance in Quantum Dot Sensitized Solar cells. The present work deals with the influence of the Photoanode (PA) thickness on the photovoltaic performance of these excitonic solar cells. Optical, morphological and electrochemical properties of these films are studied using UV eVisible spectroscopy, Scanning electron microscopy and Cyclic Voltammetry. Sandwich solar cells assembled using these PAs are further characterized using Electrochemical Impedance Spectroscopy and Chronoamperometry to investigate the electron transfer processes occurring at the sensitized photoelectrode/ Electrolyte interface. These cells are then evaluated for their photovoltaic performance using JV characteristics. The results obtained are explained qualitatively invoking the thickness dependent parameters like Light harvesting efficiency and Electron transfer yield to establish the effect of PA thickness on the solar cell performance.
CFD Prediction of a Cyclone Separator
Ranadip Madhu,Prasad, B.V.S.S.S.,Heuy-Dong Kim 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
This paper presents a numerical study of the gas-anthracite particle flow in a tangential cum spiral inlet cyclone separator by increasing the vortex finder length. The pressure and flow field are computed and then used in the determination of particles flow that is simulated by the use of a Discrete Phase Model (DPM) following Euler-Lagrangian model. The efficiency variation of the cyclone separator is shown in terms of collection efficiency and trajectories of particles from the simulation. The effects of particle size, density and vortex finder length on the collection efficiency are quantified.
Generation of a quasi-monoergetic proton beam from laser-irradiated sub-micron droplets (8 pages)
Ter-Avetisyan, S.,Ramakrishna, B.,Prasad, R.,Borghesi, M.,Nickles, P.V.,Steinke, S.,Schnurer, M.,Popov, K.I.,Ramunno, L.,Zmitrenko, N.V. AMERICAN INSTITUTE OF PHYSICS 2012 Physics of plasmas Vol.19 No.7
K. Krishna Prasad,S. Venkata Mohan,Y. Vijaya Bhaskar,S. V. Ramanaiah,V. Lalit Babu,B. R. Pati,P. N. Sarma 한국미생물학회 2005 The journal of microbiology Vol.43 No.3
The feasibility of laccase production by immobilization of Pleurotus ostreatus 1804 on polyurethane foam (PUF) cubes with respect to media composition was studied in both batch and reactor systems. Enhanced laccase yield was evidenced due to immobilization. A relatively high maximum laccase activity of 312.6 U was observed with immobilized mycelia in shake flasks compared to the maximum laccase activity of free mycelia (272.2 U). It is evident from this study that the culture conditions studied, i.e. biomass level, pH, substrate concentration, yeast extract concentration, Cu2+ concentration, and alcohol nature, showed significant influence on the laccase yield. Gel electrophoretic analysis showed the molecular weight of the laccase produced by immobilized P. ostreatus to be 66 kDa. The laccase yield was significantly higher and more rapid in the packed bed reactor than in the shake flask experiments. A maximum laccase yield of 392.9 U was observed within 144 h of the fermentation period with complete glucose depletion.