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Shade Interest Points for Dynamic Stream Object Categorization
S. Suresh Babu,Venkata Naresh Mandhala,Siva Koteswara Rao Chinnam,Tai-hoon Kim 보안공학연구지원센터 2015 International Journal of Multimedia and Ubiquitous Vol.10 No.4
Discovery of investment focuses for ensuing handling is one of the fundamental parts of machine vision. Object order of pictures vigorously depends on investment point identification from which nearby picture descriptors are registered for picture matching. Since investment focuses are focused around luminance, past methodologies generally overlooked the color viewpoint. Later an approach that uses saliency-based peculiarity determination improved by a primary part dissection based scale choice strategy is created. It is utilized to lessen the affectability to changing imaging conditions, and hence it is a light-invariant investment point's location framework. Utilization of color expands the uniqueness of investment focuses. In the setting of item distinguishment, the human observation framework is regularly pulled in by contrasts between parts of pictures and by movement or moving articles. In this manner, in the feature indexing system, investment focuses give more helpful data when contrasted with static pictures. So we propose to amplify the above methodology for element feature streams utilizing Space-Time Interest Points (Stips) that uses a calculation for scale adaption of spatio-worldly investment focuses. STIP distinguishes moving questions in features and describes some particular changes in the development of these articles. A handy execution of the proposed framework accepts our case to help element streams and further it could be utilized as a part of uses, for example, Motion Tracking, Entity Detection and Naming applications.
BOUNDS ON THE GROWTH RATE FOR THE KUO PROBLEM
S. LAVANYA,V. GANESH,G. VENKATA RAMANA REDDY The Korean Society for Computational and Applied M 2023 Journal of applied mathematics & informatics Vol.41 No.2
We consider Kuo problem of hydrodynamic stability which deals with incompressible, inviscid, parallel shear flows in the 𝛽-plane. For this problem, we derived instability region without any approximations and which intersects with Howard semi-circle region under certain condition. Also, we derived upper bound for growth rate and amplification factor of an unstable mode and proved Howard's conjecture.
Venkata Reddy, Ch.,Ravikumar, R.V.S.S.N.,Srinivas, G.,Shim, J.,Cho, M. Elsevier 2017 Materials science and engineering B. Advanced Func Vol.221 No.-
<P>CdS, SnO2 and CdS/SnO2 hybrid photocatalyst nanostructure were synthesized using a two-step (co-pre cipitation/hydrothermal) method. The as-prepared materials were characterized by powder X-ray diffraction, transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), surface analysis (BET), photoluminescence spectra (PL), UV-Vis diffusion reflectance spectroscopy (DRS), fourier transform infrared spectroscopy (FT-IR), and photocatalytic activity. The band gap energies calculated from the DRS results are 3.30, 2.15, and 2.99 eV for pristine SnO2, CdS, and the CdS/SnO2 hybrid photocatalyst, respectively. The CdS/SnO2 hybrid photocatalyst showed more efficient charge carrier separation and improved photocatalytic degradation of methyl orange (MO). The highest degradation rate constant was achieved for the CdS/SnO2 hybrid photocatalyst (0.02434 min(-1)) compared to CdS (0.01381 min(-1)) and SnO2 (0.00878 min(-1)). The present study provides insights for improving the photocatalytic activity and photo-stability of CdS/SnO2 hybrid photocatalyst. (C) 2017 Elsevier B.V. All rights reserved.</P>
Finite element modeling and bending analysis of piezoelectric sandwich beam with debonded actuators
K. Venkata Rao,S. Raja,T. Munikenche Gowda 국제구조공학회 2014 Smart Structures and Systems, An International Jou Vol.13 No.1
The present work pays emphasis on investigating the effect of different types of debonding on the bending behaviour of active sandwich beam, consisting of both extension and shear actuators. An active sandwich beam finite element is formulated by using Timoshenko’s beam theory, characterized by first order shear deformation for the core and Euler-Bernoulli’s beam theory for the top and bottom faces. The problemof debondings of extension actuator and face are dealt with by employing four-region model for inner debonding and three-region model for the edge debonding respectively. Displacement based continuity conditions are enforced at the interfaces of different regions using penalty method. Firstly, piezoelectric actuation of healthy sandwich beam is assessed through deflection analysis. Then the effect of actuators’ debondings with different boundary conditions on bending behavior is computationally evaluated and experimentally clamped-free case is validated. The results generated will be useful to address the damage tolerant design procedures for smart sandwich beam structures with structural control and health monitoring applications.
Paper : Characteristic Studies of Plasma Treated unidirectional Hildegardia Populifolia Fabric
( C Venkata Prasad ),( D W Lee ),( P Sudhakara ),( D Jagadeesh ),( B S Kim ),( S I Bae ),( J I Song ) 한국복합재료학회 2013 Composites research Vol.26 No.1
This study deals with effect of plasma treatment on the properties of unidirectional ligno cellulosic fabric Hildegardia Populofolia (HDP) fabric. Thermal stability of the fabric was determined by differential scanning calorimetry (DSC) and Thermo gravimetric analysis (DSC). Morphological properties was analyzed by SEM analysis and found that the surface was rough upon plasma treatment which provides good interfacial adhesion with matrix during composite fabrication. Thermal stability and mechanical properties of the plasma treated fabric slightly increases compare to alkali and untreated fabric. It was observed that tensile properties of the fabric increases upon plasma treatment due to the formation of rough surface. SEM analysis indicates formation of rough surface on plasma treatment which helps in increasing the interfacial interaction between the matrix (hydrophobic) and fabric (hydrophilic).
Reddy, Ch.Venkata,PrabhakarVattikuti, S.V.,Ravikumar, R.V.S.S.N.,Moon, Sang Jun,Shim, Jaesool Elsevier 2015 Journal of magnetism and magnetic materials Vol.394 No.-
<P><B>Abstract</B></P> <P>Cadmium substituted cobalt ferrite nanoparticles are synthesis using the chemical method. The as-prepared ferrite nanoparticles are calcinated at 300°C and 600°C respectively. The samples are studied using; Powder XRD, SEM with EDX, TEM, FT-IR, TG-DTA and vibrating sample magnetometer (VSM) in order to study the calcination temperature effect on structural, morphological and magnetic properties. The magnetic properties, like saturation magnetization and coercivity increases with increasing the calcination temperature. This enhancement is attributed to the transition from amulti-domain to a single-domain nature. The absorption bands observed at 588cm<SUP>−1</SUP> (<I>ν</I> <SUB>1</SUB>) and 440cm<SUP>−1</SUP> (<I>ν</I> <SUB>2</SUB>) are attributed to the vibrations of tetrahedral and octahedral complexes. The TG-DTA curves reveal the thermal stability of the prepared ferrite nanoparticles. The calcination temperature influences the magnetic properties, surface morphology and crystalline size.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Cd<SUB>0.3</SUB>Co<SUB>0.7</SUB>Fe<SUB>2</SUB>O<SUB>4</SUB> nanoparticles synthesized using the chemical co-precipitation. </LI> <LI> The magnetization, coercivity values increases with increasing the calcination temperature. </LI> <LI> The calcination temperature influences the magnetic properties and crystallite size. </LI> <LI> The FTIR spectra results confirmed the vibrations of tetrahedral and octahedral complexes. </LI> </UL> </P>
Finite element modeling and bending analysis of piezoelectric sandwich beam with debonded actuators
Rao, K. Venkata,Raja, S.,Munikenche, T. Techno-Press 2014 Smart Structures and Systems, An International Jou Vol.13 No.1
The present work pays emphasis on investigating the effect of different types of debonding on the bending behaviour of active sandwich beam, consisting of both extension and shear actuators. An active sandwich beam finite element is formulated by using Timoshenko's beam theory, characterized by first order shear deformation for the core and Euler-Bernoulli's beam theory for the top and bottom faces. The problem of debondings of extension actuator and face are dealt with by employing four-region model for inner debonding and three-region model for the edge debonding respectively. Displacement based continuity conditions are enforced at the interfaces of different regions using penalty method. Firstly, piezoelectric actuation of healthy sandwich beam is assessed through deflection analysis. Then the effect of actuators' debondings with different boundary conditions on bending behavior is computationally evaluated and experimentally clamped-free case is validated. The results generated will be useful to address the damage tolerant design procedures for smart sandwich beam structures with structural control and health monitoring applications.
Shim, J.,Venkata Reddy, Ch.,Sarma, G.V.S.S.,Narayana Murthy, P.,Ravikumar, R.V.S.S.N. Pergamon 2015 Spectrochimica acta. Part A, Molecular and biomole Vol.142 No.-
A simple co-precipitation method has been used for the synthesis of Co<SUP>2+</SUP> and Ni<SUP>2+</SUP>-doped zinc borate nanopowders. X-ray diffraction (XRD), Fourier transform infrared (FT-IR), UV/Vis absorption, Scanning electron microscope (SEM) with EDS and photoluminescence (PL) spectroscopies techniques has been employed for their characterization. Powder X-ray diffraction data reveals that the crystal structure belongs to monoclinic for both as-prepared samples. SEM images showed surface morphology of the prepared samples. Optical absorption spectra showed the characteristic bands of doped ions in octahedral site symmetry. From the optical absorption data crystal field and inter-electronic repulsion parameters are evaluated. The FT-IR spectra showed the characteristic vibrational bands related to ZnO, BO<SUB>3</SUB> and BO<SUB>4</SUB> molecules. Photoluminescence spectra exhibited the emission bands in ultraviolet and blue regions.
Lee, Y.S.,Gopi, C.V.V.M.,Venkata-Haritha, M.,Rao, S.S.,Kim, H.J. Elsevier Sequoia 2017 Journal of photochemistry and photobiology Chemist Vol. No.
The high stability and superior electrocatalytic activity of counter electrodes (CEs) are crucial but important issues in high performance quantum dot-sensitized solar cells (QDSSCs). To address the above issues, nanoparticle-structured nickel sulfide (NiS) thin film electrodes were prepared on F-doped SnO<SUB>2</SUB> glass (FTO glass) substrates using a facile chemical bath deposition method at different growth times and used directly as the CEs for CdS/CdSe/ZnS QDSSCs. The surface morphology and thickness of the resulting NiS films are greatly affected by the deposition time. By optimizing the growth time of the NiS CE materials, a power conversion efficiency up to 3.25% was achieved for CdS/CdSe/ZnS based QDSSCs, which was much higher than that of the Pt CE (0.79%). In addition, a preliminary durability test of the CE in QDSSCs reveals that the NiS CE exhibited good stability than the Pt CE. The improved performance of the QDSSC was attributed to the resulting electrochemical catalytic activity of the NiS CE with efficient charge transfer at the CE/electrolyte interface, which was verified by the electrochemical impedance spectroscopy and the Tafel polarization measurement results. Therefore, the excellent electrochemical performance of NiS highlights its promising application as a CE for high performance QDSSCs.