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Search Results: 1 - 10 of 337 matches for " Surendra Sunda "
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Improvement of Position Accuracy with GAGAN and the Impact of Scintillation on GNSS  [PDF]
Surendra Sunda, B. M. Vyas, S. V. Satish, K. S. Parikh
Positioning (POS) , 2013, DOI: 10.4236/pos.2013.44028

GAGAN is an Indian implementation of Satellite Based Augmentation System (SBAS), developed jointly by Airports Authority of India (AAI) and Indian Space Research Organisation (ISRO). It is in final operational phase with all the required ground and space segments ready. With the availability of GAGAN signal-in-space (SIS), the improvement in position solution is investigated using the two collocated dual frequency GPS receivers. One of the receivers was configured as SBAS receiver and the other was kept as GPS stand-alone receiver. It is found that accuracy in position improved significantly in SBAS receiver due to GAGAN correction. The impact of scintillation on GNSS was also investigated in terms of position degradation and loss of lock of the satellite signals. The manyfold effects of scintillation on GPS and SBAS are discussed in detail. The results indicate ~15% reduction in number of measurements due to loss of lock during severe scintillation.

Object-Oriented Finite Element Analysis of Metal Working Processes  [PDF]
Surendra Kumar
Journal of Software Engineering and Applications (JSEA) , 2010, DOI: 10.4236/jsea.2010.36066
Abstract: Recently an object-oriented approach has been applied in the fields of finite element analysis with a view to treating the various complexities within these. It has been demonstrated that finite element software designed using an object-oriented approach can be significantly more robust than traditional codes. This paper describes a special kind of implementation of object-oriented programming which is rather hybrid in nature, in the development of a finite element code for engineering analysis of metal working problems using C++, and discusses the advantages of this approach.
Mathematical Modeling of the Transmission Dynamics of Fowl Pox in Poultry
Udofia Ekere Sunda,Inyama Simeon Chioma
Journal of Modern Mathematics and Statistics , 2012, DOI: 10.3923/jmmstat.2011.106.111
Abstract: In this study, researchers present two models that examine the transmission dynamics of fowl pox among birds based on the mode of transmission of the disease in poultry. Using methods from dynamical systems theory equilibrium analysis of the first model showed that the disease free equilibrium is stable if α N <(d1+μ+r1), β<γ. The endemic equilibrium is asymptotically stable if β-γ<α (d1+μ+r1)/k. That is, fowl pox will not invade the poultry if the rate at which the susceptible birds (β) are introduced into the poultry is greater than the rate at which the susceptible birds become exposed to infection (γ). It was also established that R0<1 if S0>Sc where Sc = (d1+μ+r1)/α and R0 = γ S0/(d1+μ+r1). The second model is stable if the rate at which the infected birds recover and the rate at which mosquitoes die are high. Also if the growth rate of mosquito is less than the death rate of mosquito.
Kaushik Avinash,Dwivedi Abha,Sunda Mukesh
International Research Journal of Pharmacy , 2011,
Abstract: Now a days, The novel drug delivery system is creating a new interest in development of drug deliveries. Vesicular drug delivery system in also a part of this novel drug delivery system which is designed according to the recent demands of treatment like sustain release of drug in systemic circulation, definite dosing interval. Transferosomes are part of this vesicular drug delivery system which are altered deformable vesicles used to enhance skin penetration. It is also a controlled & targeted drug delivery system which is used to increase the existence of drug in systemic circulation & decrease the toxicity.Transferosomes are proposed for variety of applications in humans like as carrier for insulin & vaccines. In this review, we mainly focus on transferosome with its applications, limitations, advantages & preparation.
Role of Silver Incorporation on the Specific Heat in Glassy Se80Te20 Alloy  [PDF]
Shipra Saraswat, Surendra Dutt Sharma
New Journal of Glass and Ceramics (NJGC) , 2014, DOI: 10.4236/njgc.2014.44009
Abstract: Specific heat measurements have been made in glassy Se80-xTe20Agx (0 ≤ x ≤ 15) alloys using differential scanning calorimetry (DSC) technique. An extremely large increase in the specific heat values has been observed at the glass transition temperature. It has also been found that the values of Cp below glass transition temperature and the difference of Cp values before and after glass transition (ΔCp) are highly composition dependent. This indicates that the incorporation of Ag in binary Se80Te20 alloy in the present study influences the structure of the binary alloy. Specific heat of the additive element Ag is found to be important for the observed changes in the specific heat of the ternary alloys as compared to binary alloy.
Indian Elections 2004: A Retrospective Analysis and Overview
Lawrence Surendra
Kasarinlan : Philippine Journal of Third World Studies , 2004,
Abstract: Elections at best reflect three dimensions of formal democracy—representation in terms of representing the political will of the people; integration in terms of social classes and groups largely done through political parties, which represents the stabilising aspect of democracy; and decisions generated from stable majorities through coalitions or a single party to ensure “majorities” within parliaments and their governability. In many societies democracy can be and has been subverted in all three dimensions. Electoral results and their reflections on democracy, at best, can be tendential statements of what the results reveal.
The art of retirement for orthopedic surgeons
Tuli Surendra
Indian Journal of Orthopaedics , 2009,
Object-Oriented Finite Element Programming for Engineering Analysis in C++
Surendra Kumar
Journal of Software , 2010, DOI: 10.4304/jsw.5.7.689-696
Abstract: Recently there has been growing interest in applying object-oriented approach to large-scale programs with a view to treating the various complexities within these. Software designed using an object-oriented approach can be significantly more robust than traditional software. More codes can be reused and it can be easier to refine, test, maintain and extend the software. Several benefits of this approach may also be observed in the area of finite element analysis. This paper describes an implementation of object-oriented programming to the finite element method for engineering analysis using C++, and illustrates the advantages of this approach.
Enhancement of Phase Matching Ability in One-Dimensional Photonic Crystal through Plasma Materials  [PDF]
Surendra Prasad, Vivek Singh, Abhay Kumar Singh
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2011, DOI: 10.4236/jemaa.2011.37041
Abstract: We have theoretically studied the modal dispersion equation and effective refractive index of one-dimensional plasma photonic crystals (1-D PPCs) having different materials in one unit cell. The dispersion relations related for such structure is derived by solving Maxwell’s equation using the transfer matrix method. It is found that the presence of plasma in a unit cell enhanced the phase matching ability and provides additional degree of freedom to control phase matching condition compared to the conventional one-dimensional photonic crystals (1-D PCs).
The Dispersion Characteristics of a One Dimensional Plasma Photonic Crystal Having Inhomogeneous Plasma Density Profiles  [PDF]
Surendra Prasad, Vivek Singh, A. K. Singh
Optics and Photonics Journal (OPJ) , 2012, DOI: 10.4236/opj.2012.223034
Abstract: The dispersion characteristics of binary 1D-PPCs having inhomogeneous plasma in the unit cell are studied. Using the transfer matrix method the required dispersion relations are obtained. Here the linear and exponential plasma density profiles are considered and compared with the homogeneous plasma having uniform density profile. It is observed that the inhomogeneity in plasma layer highly affect dispersion curves. By comparing the dispersion curves obtained in all considered cases, it is found that the widths of band gaps and phase velocities are always larger for exponential density profile than the linear uniform density profiles in the considered frequency range.
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