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Atheaya D.,Indian Institute of Technology Delhi | Tiwari A.,JSS Academy of Technical Education | Tiwari G.N.,Indian Institute of Technology Delhi | Al-Helal I.M.,King Saud University
Solar Energy | Year: 2015

In this paper, an analytical expression for characteristic equation of a partially covered photovoltaic thermal compound parabolic concentrator (PVT-CPC) water collector system similar to Hottel-Whillier-Bliss (HWB) equation of flat plate collector has been derived. The derivation is based on basic energy balance equation for each component of partially covered PVT-CPC water collector system. The analytical result of proposed partially covered PVT-CPC water collectors [case (i)] has been compared with [case (ii)]: fully covered PVT-CPC water collectors; [case (iii)]: conventional CPC water collectors and [case (iv)]: partially covered PVT water collectors. It is observed that (a) an overall exergy efficiency of partially covered PVT-CPC water collector (25%PV) system is maximum and (b) an instantaneous thermal efficiency of conventional CPC water collector system [case (iii)] is maximum as compared to other cases. © 2014 Elsevier Ltd. Source

Shivakumara I.S.,Bangalore University | Mamatha A.L.,JSS Academy of Technical Education
Journal of Porous Media | Year: 2010

The effects of the temperature-dependent viscosity and density maximum on the criterion for the onset of convection in a horizontal porous layer are investigated when the solid and fluid phases are not in local thermal equilibrium. A two-field model that represents the fluid-and solid-phase temperature fields separately is used for the energy equation. The Galerkin method is used to obtain the eigenvalue equation, which is then solved numerically. It is noted that higher values of the viscosity number and the parameter representing the maximum-density property have the effect of delaying the onset of convection and reducing the size of convection cells. In addition, the influence of parameters representing the thermal nonequilibrium effects on convective instability is discussed in detail. © 2010 by Begell House, Inc. Source

Pal M.,JSS Academy of Technical Education
International Conference on Computing, Communication and Automation, ICCCA 2015 | Year: 2015

The fundamental of motion estimation is that the objects in a frame of video sequence should only move within the original frame to form corresponding objects on the next frame. The concept of block matching method is to partition current frame into a matrix of macro blocks, that are compared with corresponding block and its adjoining neighbors in the last frame to create a vector that determines the motion of a macro block from one position to another in the preceding frame. This movement calculated for all the macro blocks consisting a frame, calculates the motion approximated in current frame. The search region for a perfect macro block equivalent is limited up to s pixels on all fours sides of the corresponding macro block in previous frame. This 's' is known as the search region. Bigger movements require a big s, and the bigger the search region, the process of motion estimation becomes costly. Motion estimation is the main process of block matching algorithms. The motion vector for every block is calculated by obtaining perfect equivalent block of pixels within the search area region in the last frame according to matching criterion. The efficiency of Block Matching Algorithms can be improved by increasing the PSNR of compensated image, changing Block size on Block Matching Algorithm and decreasing number of computations. Block Matching Algorithm is a part in Video Compression Process. Improving the working of Block Matching Algorithm reduces the time taken to compress a video. Motion estimation is used widely in various image sequence coding schemes. It plays a important part in the carrying & storage of video signals at reduced bit rates. © 2015 IEEE. Source

Yadav N.P.,JSS Academy of Technical Education
Wireless Personal Communications | Year: 2013

A dual frequency resonance antenna achieved by introducing L-strip feed in circular disk patch is analysed by using circuit theory concept. The resonance frequency is found to be 5.19 and 10.44 GHz for lower and upper resonance frequency respectively and the bandwidth of the proposed antenna for lower and upper resonance frequency is found to be 11.54 and 13.12 %. When the notch is cut on the circular disk patch dual resonance frequency is shifted higher side and the resonance frequency is found to be 5.84 and 10.54 GHz. It is found that the resonance frequency is observed 1.860 and 1.824 respectively. It is easy to adjust the higher and lower band by changing the dimensions of L-strip. It is found that the resonance frequency also depends on the notch dimensions. The theoretical results are compared with IE3D simulation results which are in close agreement. © 2013 Springer Science+Business Media New York. Source

Sahoo A.,JSS Academy of Technical Education | Chandra S.,Jaypee Institute of IT
International Journal of Advances in Soft Computing and its Applications | Year: 2014

In last few decades, the application of biological methods and systems to the study and design of engineering systems and modern technologies have fascinated many researchers. Numerous mathematical and meta-heuristic algorithms for solving optimization problems have been developed and widely used in both theoretical study and practical applications. To realize the application of such meta-heuristics for problem solving, the problem exercised here is the medical image segmentation. Image segmentation has an imperative role in medical image analysis for computer aided diagnosis and classification. In this paper, a number of population based meta-heuristic algorithms are reviewed and analyzed. The paper focuses on the principles behind each algorithm, the issues in designing a hybrid framework in view of the application in medical image segmentation. It extends a platform to develop novel metaheuristics, and utilize the hybrid framework for improved image segmentation. © SCRG Publication, 2014. Source

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