Indian Institute of Technology Mandi
Mandi, India

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Abbas S.,Indian Institute of Technology Mandi | Xia Y.,Zhejiang Normal University
Acta Mathematica Scientia | Year: 2013

In this paper we discuss the existence and global attractivity of k-almost automorphic sequence solution of a model of cellular neural networks. We consider the corresponding difference equation analogue of the model system using suitable discretization method and obtain certain conditions for the existence of solution. Almost automorphic function is a good generalization of almost periodic function. This is the first paper considering such solutions of the neural networks. © 2013 Wuhan Institute of Physics and Mathematics.

Singh B.,Indian Institute of Technology Mandi | Singh S.N.,Indian Institute of Technology Kanpur
Renewable and Sustainable Energy Reviews | Year: 2011

Grid integration is one of the major concerns in recent years as wind power generation level keeps on increasing continuously in the power system. Therefore, wind farms will have a significant influence on the operation and control of emerging power system, which is expanding in terms of interconnections, network capacity, load demand and addition of new devices for improving the performance of the system. New grid codes are being set up in several countries by specifying the relevant requirements for efficient, stable and secure operation of power system and these specifications have to be met in order to integrate wind power into the modern electric grid. Several states of India have high penetration of wind power and specific grid connection requirements (GCR) for wind power are yet to be established. This paper proposes GCR for wind power integration in India and discusses several technical and operational issues arising due to high penetration of wind power generation in Indian power systems. © 2010 Elsevier Ltd.

Chauhan A.,Indian Institute of Technology Mandi | Vaish R.,Indian Institute of Technology Mandi
Materials and Design | Year: 2013

The paper deals with the hard coating material selection using various multi-criteria decision making approaches. Large number of materials has stimulated intense research in the field of material selection. Various quantitative decision making approaches are employed to select hard coating material selection. Technique for order preference by similarity to ideal solution (TOPSIS) is used for ranking these materials. Material selection charts (Ashby approach) is used to select hard coating materials. Pareto-optimal hard coating materials are determined for trade-off between hardness (H), H/E and H3/E2 (E: Young's modulus). Hierarchical clustering is used to classify hard coating materials under study. Pearson correlation coefficients are calculated between the materials properties under study which can be integrated with materials informatics for rapidly screening and designing materials. © 2012 Elsevier Ltd.

Abbas S.,Indian Institute of Technology Mandi
Computers and Mathematics with Applications | Year: 2011

In this paper we discuss the existence and uniqueness of a pseudo almost automorphic solution of an integro-differential equation in a Banach space X. We achieve our results using the methods of fractional powers of operators and the Banach fixed point theorem. These results are new and complement the existing ones. © 2011 Elsevier Ltd. All rights reserved.

Thakur M.,Indian Institute of Technology Mandi
Journal of Computational Science | Year: 2014

In this paper a new genetic algorithm is developed to find the near global optimal solution of multimodal nonlinear optimization problems. The algorithm defined makes use of a real encoded crossover and mutation operator. The performance of GA is tested on a set of twenty-seven nonlinear global optimization test problems of variable difficulty level. Results are compared with some well established popular GAs existing in the literature. It is observed that the algorithm defined performs significantly better than the existing ones. © 2013 Elsevier B.V.

Diwaker,Indian Institute of Technology Mandi
Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy | Year: 2014

The electronic, NMR, vibrational, structural properties of a new pyrazoline derivative: 2-(5-(4-Chlorophenyl)-3-(pyridine-2-yl)-4,5-dihydropyrazol-1-yl) benzo[d]thiazole has been studied using Gaussian 09 software package. Using VEDA 4 program we have reported the PED potential energy distribution of normal mode of vibrations of the title compound. We have also reported the 1H and 13C NMR chemical shifts of the title compound using B3LYP level of theory with 6-311++G(2d,2p) basis set. Using time dependent (TD-DFT) approach electronic properties such as HOMO and LUMO energies, electronic spectrum of the title compound has been studied and reported. NBO analysis and MEP surface mapping has also been calculated and reported using ab initio methods. © 2014 Elsevier B.V. All rights reserved.

Chakraborty A.,Indian Institute of Technology Mandi
Molecular Physics | Year: 2011

Nonadiabatic tunnelling in an ideal one-dimensional semi-infinite periodic potential system is analysed using our model. Using our simple analytically solvable model it is shown that an ideal one-dimensional semi-infinite periodic potential system can be thought as a model of molecular switch. The method is applicable to those systems where Green's function for the motion in the absence of coupling is known. The method has been applied to the problem where motion takes place on parabolic potentials, for which analytical expression of Green's function can be found. © 2011 Taylor & Francis.

Chauhan A.,Galgotias University | Vaish R.,Indian Institute of Technology Mandi
Materials and Design | Year: 2012

Material selection is an important task because large numbers of competitive materials are available for various technological applications. Numerous material selection techniques are reported whereas most of the techniques are knowledge based and require performance indices for material selection. In this context, Ashby approach is one of the efficient methods which rely on performance indices of materials in specific application. However Multiple attribute decision making (MADM) approaches do not require exact physical relation for material selection. We have investigated micro-electromechanical system's (MEMS) material selection using MADM approaches and compared their results with that of Ashby approach. Almost similar materials ranking indicates that MADM approaches are also efficient and ease to apply without any prior mathematical calculation for materials properties-application relation. © 2012 Elsevier Ltd.

Chauhan A.,Galgotias University | Vaish R.,Indian Institute of Technology Mandi
Materials and Design | Year: 2012

A large number of magnetic materials have been fabricated and found to be promising for their technological applications. However, it is difficult to select an optimal material (for technological application) because of the conflicting tradeoffs between their properties. In this context, the screening of magnetic materials is an important task. In this article, an attempt has been made to select the soft and hard magnetic materials using Multiple Attribute Decision Making (MADM) approach. VlseKriterijumska Optimizacija I Kompromisno Resenje (VIKOR) and Technique for order preference by similarity to ideal solution (TOPSIS) methods (MADM techniques) are employed to evaluate the relative ranking of these materials understudy. The relative weights for the different attributes (properties) are calculated using Shannon's entropy method. It is found that (Supermalloy, Magnifer 7904) (79Ni-15Fe-5Mo-0.5Mn) and Ferrite 4 (sintered) (SrO-6Fe2O3) are the optimal materials among studied soft and hard magnetic materials, respectively. Hierarchical clustering is used to classify magnetic materials under study. Pearson correlation coefficients are calculated between the attributes under study. © 2011 Elsevier Ltd.

Chiral N-salicyl-β-amino alcohol Schiff bases are important ligands widely employed in asymmetric catalysis. These are referred to as 'tridentate salen ligands' and are considered as a member of the well-known 'privileged ligands' group. The desire to understand the roles of weak non-covalent interactions in catalysis has greatly expanded the scope of structural studies on catalytic complexes. This review focuses on the structural and supramolecular features of the metal complexes derived from chiral N-salicyl-β-amino alcohol Schiff base ligands. Metal complexes of varying nuclearities, such as, mono-, di-, tri- and tetra-nuclear complexes, have been reported from this group of ligands. The geometries of the metal centers present in these complexes vary from tetrahedral, square-planar, square-pyramidal, octahedral to trigonal prismatic. The available structural data clearly indicate the coordination versatility of this group of ligands towards various metal ions. In addition, these complexes exhibit a variety of weak bonding interactions leading to the formation of supramolecular structures such as helices, 1-D chains, 3-D networks, etc. in solid state. The articles discussed here highlight the competence of chiral N-salicyl-β-amino alcohol Schiff base ligands to support various structural and supramolecular features in their complexes, but the role of these features in determining their catalytic efficiencies have not yet been studied in detail. We believe that the present review may inspire many such studies in future. © 2013 Elsevier B.V.

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