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Search Results: 1 - 10 of 428178 matches for " S. K. Sharma "
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First Principle Study of Cubic SrMO3 Perovskites (M = Ti, Zr, Mo, Rh, Ru)  [PDF]
Avinash Daga, Smita Sharma, K. S. Sharma
Journal of Modern Physics (JMP) , 2011, DOI: 10.4236/jmp.2011.28095
Abstract: Lattice parameter and corresponding total free energy have been computed for cubic SrMO3 perovskites (M = Ti, Zr, Mo, Rh, Ru) using the first principle approach within Density functional theory. The results have been calculated using local density approximation (LDA) method. It is found that the calculated lattice parameter for all transition metal oxides are in good agreement with the available experimental data. The total free energy corresponding to this lattice constant has been calculated along with different components of the total free energy. All these calculations have been carried out using ABINIT computer code.
ε-Optimality in Multivalued Optimization  [PDF]
S. K. Suneja, Megha Sharma
American Journal of Operations Research (AJOR) , 2013, DOI: 10.4236/ajor.2013.34039
Abstract:

In this paper we apply the directional derivative technique to characterize D-multifunction, quasi D-multifunction and use them to obtain ε-optimality for set valued vector optimization problem with multivalued maps. We introduce the notions of local and partial-ε-minimum (weak) point and study ε-optimality, ε-Lagrangian multiplier theorem and ε-duality results.

On the Stationary Convection of Thermohaline Problems of Veronis and Stern Types  [PDF]
Joginder S. Dhiman, Praveen K. Sharma, Poonam Sharma
Applied Mathematics (AM) , 2010, DOI: 10.4236/am.2010.15052
Abstract: The stability of thermohaline convection problems of Veronis and Stern types for stationary convection is studied for quite general nature of boundaries. It is shown by means of an appropriately chosen linear transformation, that in case of stationary convection the equations describing the eigenvalue problem for thermohaline convection problems are identical to equations describing the eigenvalue problem for classical Bénard convection problem. As a consequence, the values of the critical Rayleigh numbers for the onset of stationary convection in thermohaline convection problems are obtained. Also, necessary conditions for the validity of principle of exchange of stabilities for thermohaline convection problems are derived using variational principle.
Comparative Finite Element Analysis of Jaipur Foot and Polyurethane Foot  [PDF]
Priya Sharma, Shubhda Sharma, S. Vidhya, M. K. Mathur
Engineering (ENG) , 2013, DOI: 10.4236/eng.2013.510B106
Abstract:

FEA is amongst best methods that help users to solve complex problems. There are fixed number of nodes in each ele-ment of the model that define the element boundaries to which boundary condition and loads can be applied. The geo-metry of the structure, the load applications, stress and displacement gradients can be approximated in a accurate man-ner, if the mesh is finer. The problem with the foot was unusual cracks in JP Foot and early breakage of PU Foot due to crack propagation[1]. To solve this problem we modelled the foot using SolidWorks and performed FEA Analysis for single leg below knee amputee patients. After analysis, it has been concluded that JP Foot as compared to PU Foot has more stress bearing capacity but has less displacement threshold due to its material properties[2]. This work will lead to optimization of both the feet thus enhancing the durability of foot.

 

Higher-Order Minimizers and Generalized (F,ρ)-Convexity in Nonsmooth Vector Optimization over Cones  [PDF]
S. K. Suneja, Sunila Sharma, Malti Kapoor
Applied Mathematics (AM) , 2015, DOI: 10.4236/am.2015.61002
Abstract: In this paper, we introduce the concept of a (weak) minimizer of order k for a nonsmooth vector optimization problem over cones. Generalized classes of higher-order cone-nonsmooth (F, ρ)-convex functions are introduced and sufficient optimality results are proved involving these classes. Also, a unified dual is associated with the considered primal problem, and weak and strong duality results are established.
A Review on Mechanical Properties of Natural Fiber Reinforced Hybrid Polymer Composites  [PDF]
K. P. Ashik, Ramesh S. Sharma
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2015, DOI: 10.4236/jmmce.2015.35044
Abstract: Natural fibres will take a major role in the emerging “green” economy based on energy efficiency, the use of renewable materials in polymer products, industrial processes that reduce carbon emissions and recyclable materials that minimize waste. Natural fibres are a kind of renewable resources, which have been renewed by nature and human ingenuity for thousands of years. They are also carbon neutral; they absorb the equal amount of carbon dioxide they produce. These fibers are completely renewable, environmental friendly, high specific strength, non-abrasive, low cost, and bio-degradability. Due to these characteristics, natural fibers have recently become attractive to researchers and scientists as an alternative method for fibers reinforced composites. This review paper summarized the history of natural fibers and its applications. Also, this paper focused on different properties of natural fibers (such as hemp, jute, bamboo and sisal) and its applications which were used to substitute glass fiber.
Rotifera diversity of a floodplain lake of the Brahmaputra river basin of lower Assam, Northeast India
Sharma, B.K.,Sharma, S.
Opuscula Zoologica Instituti Zoosystematici et Oecologici Universitatis Budapestinensis , 2012,
Abstract: This study analyzed diversity and ecology of planktonic Rotifera of Ghorajan beel, a floodplain lake of the Brahmaputrariver basin of lower Assam region of Northeast India. Plankton samples collected (January–December, 2010) fromlittoral (station 1) and semi-limnetic regions (station 2) of this tropical wetland revealed a fairly rich rotifer fauna (84 and 80species) with distinct variations (range, average ± SD) in monthly richness (35–55, 46±6 and 24–54, 36±5 species) andcommunity similarities (46.6–80.4 and 37.0–95.9 %) at both sampling stations. The richness followed unclear annual patterns.The rotifers mainly contributed (53.3±5.1 and 55.6± 3.6 %) to zooplankton abundance variations and showed high abundancefrom June through November at both stations. Brachionidae > Lecanidae exhibited high number of individuals; Asplanchnidaeand Flosculariidae were also quantitatively important families; specifically, Asplanchna priodonta, Sinantherina socialis, Brachionusfalcatus and Lecane bulla were important species for their abundance. Single abiotic factors exerted a more limited influence on richness than on abundance. Canonical correspondence analysis (CCA) explained 55.6 % and 59.5 % cumulative variance of the rotifer assemblages along axis 1 and 2, respectively; the CCA indicated the importance of transparency and rainfall at station 1, and of transparency, dissolved oxygen and rainfall at station 2. Consequently, the littoral and semi-limnetic stations are characterized by micro-environmental differences.
Diversity of zooplankton in a tropical floodplain lake of the Brahmaputra river basin, Assam (Northeast India)
Sharma, B.K.,Sharma, S.
Opuscula Zoologica Instituti Zoosystematici et Oecologici Universitatis Budapestinensis , 2012,
Abstract: The zooplankton diversity of a floodplain lake of the Brahmaputra river basin of lower Assam is analyzed on the bases of net plankton samples collected from the littoral (station 1) and semi-limnetic (station 2) regions during January–December 2010. The species-rich zooplankton (143 species) hypothesized environmental heterogeneity of this wetland. They showed high monthly richness (81 ± 11 and 72 ± 11 species) and recorded 44.7–79.3% and 46.7–89.7% community similarities at two sampling stations, respectively. Zooplankton formed 55.5 ± 10.9 % and 63.9 ± 9.6 % of net plankton abundance. Rotifera > Cladocera mainly influenced their richness and density variations. Copepoda is a sub-dominant quantitative group while Mesocyclops spp., Asplanchna priodonta, Chydorus sphaericus, Bosmina longirostris and Sinantherina socialis are relatively important taxa. High species diversity and low densities of majority of species are hypothesized to fine niche portioning amongst different species in combination with high micro- and macro-scale habitat heterogeneity. The zooplankton is characterized by high equitability and low dominance. Individual abiotic factors recorded limited influence on richness and abundance. Canonical correspondence analysis with ten abiotic factors explained 56.0 % and 55.8 % cumulative variance of zooplankton assemblages along axis 1 and 2. The CCA affirmed micro-environmental differences between the sampling stations.
AB-INITIO STUDY OF BULK MODULUS AND CHARGE DENSITY OF CUBIC SrMO3 PEROVSKITES (M = Ti, Zr, Mo, Rh, Ru)
AVINASH DAGA,SMITA SHARMA,K. S. SHARMA
International Journal of Engineering Science and Technology , 2012,
Abstract: Bulk modulus & charge density of cubic SrMO3 perovskites (M = Ti, Zr, Mo, Rh & Ru) have been investigated systematically using the first principle density functional calculations. Local density approximation (LDA)method has been used to compute the two quantities for five perovskites. It is found that the calculated bulk modulus for all the transition metal oxides are in good agreement with the available experimental data and with other theoretical results previously reported in the literature. ABINIT computer code is used to carry out all the calculations. Charge density plots for all the five cubic SrMO3 perovskites have been drawn using MATLAB. The maximum and minimum values of charge density along with the corresponding reduced coordinates are reported for all the perovskites.
Ichthyosis-associated spheroid corneal degeneration in HLA-DR identical brothers
Sharma K,Agrawal S,Sharma R
Indian Journal of Ophthalmology , 1993,
Abstract:
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