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Kumar N.,Mmh College | Kumar A.,Vishveshwarya Institute of Engineering and Technology
Proceedings of the International Astronomical Union | Year: 2010

We investigate the combined effects of thermal conduction, compressive viscosity and optically thin radiative losses on the period ratio, P 1/2P2, (P1 is the period of the fundamental mode and P2 is the period of its first harmonic) of a slow mode propagating one dimensionally. We obtain the dispersion relation and solve it to study the influence of non-ideal effects on the period ratio. The dependence of period ratio on thermal conductivity, compressive viscosity and radiative losses has been shown graphically. It is found that the effect of thermal conduction on the period ratio is negligible while compressive viscosity and radiation have sufficient effects for small loops and large loops respectively. © International Astronomical Union 2011. Source

Mishra V.R.,Vishveshwarya Institute of Engineering and Technology | Mathur R.,Motilal Nehru National Institute of Technology
Procedia Engineering | Year: 2012

Since the development of Stewart platform as flight simulator by Stewart in 1965, many investigators have modified the constructional features of Stewart Platform to enhance its reach near to the base by imparting larger tilt angle of top platform. This paper presents a Stewart platform with flexible sized base and top platforms. The flexibility in the size of these platforms is obtained by providing mobile knots on the base and top platforms. The tilt angle of the top platform at various sizes of base platform has been determined and it is shown that the flexibility in the size of base platform imparts greater tilt angle to the top platform. It is also shown that height of Stewart platform for achieving maximum tilt angle is larger as compared to that of the proposed manipulator. © 2012 The Authors. Source

Kaushik A.K.,Galgotias University | Kumar A.,Galgotias University | Yadava R.L.,Galgotias University | Saxena D.,Vishveshwarya Institute of Engineering and Technology
Communications in Computer and Information Science | Year: 2011

The color images generally contain data which may be corrupted by noise, and the subject under study is normally blurred because of improper focusing during image acquisition. Thus, this paper, proposes the use of fourth order Partial Differential Equation and some enhancement parameter to remove this problem. Our purposed method makes the use of information of different intensity from normal image and noisy images, so that, the performance of our proposed method is better than that of existing color image enhancement algorithms. Various experiments are used to evaluate and analysis the performance of our proposed algorithm. Experimental results tested from a large data set of image have demonstrated that the proposed method is effective and practical. Some parameters like as PSNR are analyzed for both existing and proposed method to determine the success and limitation of our method. © 2011 Springer-Verlag Berlin Heidelberg. Source

Khan Y.,Zhejiang University | Tiwari P.,Ideal Institute of Technology | Ali R.,Vishveshwarya Institute of Engineering and Technology
Computers and Mathematics with Applications | Year: 2012

The present paper deals with the variational approach for solving a clamped rectangular plate under a uniform load. The increasing use of composite materials for plate-type structures intensified the need for solutions of rectangular plates. The variational approach has a broad range of applications in solid mechanics. The methods used to solve the problem consider the minimum total potential energy approach. The maximum deflection is obtained for a square plate by the Ritz, Galerkin and Kantorovich methods. The aim of this paper is to find an approximate solution of higher accuracy. Numerical results for various components of stresses are found and plotted in the form of curves. The results obtained by various methods are compared with those reported earlier. The results show reasonable agreement with the known results, but with a simple and practical approach. The physical aspect of the concept is the immediate use of these results in solid and structural mechanics. © 2011 Elsevier Ltd. All rights reserved. Source

Srivastava S.K.,Indian Institute of Technology Delhi | Srivastava S.K.,Vishveshwarya Institute of Engineering and Technology | Singh I.P.,Indian Institute of Technology Delhi
Polymer Journal | Year: 2012

The processing parameters, namely, clay loading, magnetic stirring time and sonication time, were optimized for the dispersion of two types of clay into an epoxy and into chopped strand mat (CSM) glass fiber-based epoxy nanocomposite laminates. A vacuum-assisted resin transfer molding setup was used to fabricate these laminates. Optimizations were performed based on improvements in Young's modulus. The intercalated and exfoliated distributions of clay in the composites were confirmed using X-ray diffraction and transmission electron microscopy. The transmission electron micrographs of optimized specimens showed a well-ordered intercalated structure within the epoxy. Using optimized processing conditions, three layered laminates of CSM, woven roving glass fibers or both were prepared with epoxy and clay for the preparation of new lightweight hybrid epoxy nanocomposites. The tensile, flexural and impact properties of these hybrid nanocomposites were investigated. A combination of the two types of glass fibers produced promising results. © 2012 The Society of Polymer Science, Japan (SPSJ) All rights reserved. Source

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