Dn College

Meerut, India

Dn College

Meerut, India
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Jain S.,Banasthali University | Singh S.R.,Dn College
Advances in Intelligent Systems and Computing | Year: 2014

We develop an inventory model with time-dependent demand rate and deterioration, allowing shortages. The production rate is assumed to be finite and proportional to the demand rate. The shortages are partially backlogged with timedependent rate. Inflation is also taken in this model. Inflation plays a very significant role in inventory policy.We developed the model in both fuzzy and crisp sense. The model is solved logically to obtain the optimal solution of the problem. It is then illustrated with the help of numerical examples. Sensitivity of the optimal solution with respect to changes in the values of the system parameters is also studied. © Springer India 2014.

Singh S.R.,Dn College | Jain S.,Banasthali University | Pareek S.,Banasthali University
International Journal of Industrial Engineering Computations | Year: 2013

In this paper, we develop a two-warehouse imperfect production model under two cases: (i) model starts with shortages (ii) model ends with shortages. Most of the researchers proposed the models for perfect items but we develop for imperfect quality items, which is very realistic. Demand is taken as time dependent and dependent on the production. Holding cost in rented warehouse (RW) is greater than own warehouse (OW). Deterioration is taken as Weibull distribution in both OW and RW. Shortages are allowed and partially backlogged. The effect of learning on production cost is also considered. Learning from one cycle to other cycle, improve the efficiency of the organization. A numerical example including the sensitivity analysis is given to validate the results of the production-inventory model. © 2013 Growing Science Ltd. All rights reserved.

Jawla P.,Banasthali University | Singh S.R.,Dn College
International Journal of Industrial Engineering Computations | Year: 2016

This study aims to investigate the multi-item inventory model in a production/rework system with multiple production setups. Rework can be depicted as the transformation of production rejects, failed, or non-conforming items into re-usable products of the same or lower quality during or after inspection. Rework is very valuable and profitable, especially if materials are limited in availability and also pricey. Moreover, rework can be a good contribution to a ‘green image environment’. In this paper, we establish a multi-item inventory model to determine the optimal inventory replenishment policy for the economic production quantity (EPQ) model for imperfect, deteriorating items with multiple productions and rework under inflation and learning environment. In inventory modelling, Inflation plays a very important role. In one cycle, production system produces items in n production setups and one rework setup, i.e. system follows (n, 1) policy. To reduce the deterioration of products preservation technology investment is also considered in this model. Holding cost is taken as time dependent. We develop expressions for the average profit per time unit, including procurement of input materials, costs for production, rework, deterioration cost and storage of serviceable and reworkable lots. Using those expressions, the proposed model is demonstrated numerically and the sensitivity analysis is also performed to study the behaviour of the model. © 2016 Growing Science Ltd. All rights reserved.

Sahoo P.S.,Betnoti College Betnoti | Panigrahi A.,Dn College | Patri S.K.,Indian Institute of Technology Kharagpur | Choudhary R.N.P.,Indian Institute of Technology Kharagpur
Journal of Materials Science: Materials in Electronics | Year: 2010

Polycrystalline sample of Ba 5SmTi 3V 7O 30 was prepared by a high-temperature solid-state reaction technique. Structural and microstructural characterizations were performed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). X-ray preliminary structural studies reveal that the material has orthorhombic structure at room temperature. Detailed electrical (dielectric and impedance) properties of the material studied by using a complex impedance spectroscopy (CIS) technique in a wide temperature range (33-450 °C) at different frequencies (10 2-10 6 Hz) reveal that the relative dielectric constant of the material increases with rise in temperature and thus bulk has a major contribution to its dielectric and electrical properties. The bulk resistance of the material decreases with rise in temperature exhibiting a typical negative temperature coefficient of resistance (NTCR) behavior. The nature of the temperature variation of conductivity and value of activation energy, suggest that the conduction process is of mixed-type (ionic-polaronic and space charge). The existence of ferroelectricity in the compound was confirmed from polarization study. © 2009 Springer Science+Business Media, LLC.

Singh S.R.,Dn College | Sharma S.,Dn College
Advances in Intelligent Systems and Computing | Year: 2014

In this article, an inventory model is developed to deal with the impreciseness present in the market demand and the various cost parameters. The presented model is developed in crisp and fuzzy environments. Signed distance method is used for defuzzification. In most of the classical models, constant demand rate is considered. But in practice purchasing deeds of the customers is affected by the selling price and inventory level. In this study, we have considered demand rate as a function of stock-level and selling price. Two parameters Weibull distribution deterioration is considered. It is assumed that shortages are allowed and are partially backordered with the time dependent backlogging rate. A numerical experiment is provided to illustrate the problem. Sensitivity analysis of the optimal solution with respect to the changes in the value of the system parameters is also discussed. © Springer India 2014.

Rana D.K.,University of Delhi | Srivastav V.,Solid State Physics Laboratory | Pal R.,Solid State Physics Laboratory | Yadav B.S.,DN College
Infrared Physics and Technology | Year: 2012

Transfer length method (TLM) structures were fabricated to characterize the Ni/Au/AuGe-n +-GaAs contacts for quantum dot infrared photodetector (QDIP). Low specific contact resistance of the order of 10 -5 Ω cm 2 indicates formation of a good Ohmic contact. The current-voltage measurements show that current transport is linear with no significant interfacial modification due to alloying of the contact metal. Low contact resistance makes this scheme suitable for the fabrication of heterostructure QDIP devices. © 2011 Elsevier B.V. All rights reserved.

Singhal S.,Dn College | Singh S.R.,Dn College
International Journal of Industrial Engineering Computations | Year: 2013

This paper addresses a multi items volume flexible system for time dependent decaying items with the concept of machine breakdown and imprecise environment. In this study, partially backlogged shortages have been discussed. All the costs are fuzzified with signed distance method. Numerical examples are given to illustrate the theoretical results and sensitivity analysis is given to validate the results for various parameters. © 2013 Growing Science Ltd.

Kumar R.,Kurukshetra University | Devi S.,Dn College
Structural Engineering and Mechanics | Year: 2010

The two-dimensional deformation of a homogeneous, isotropic thermoelastic half-space with voids with variable modulus of elasticity and thermal conductivity subjected to thermomechanical boundary conditions has been investigated. The formulation is applied to the coupled theory(CT) as well as generalized theories: Lord and Shulman theory with one relaxation time(LS), Green and Lindsay theory with two relaxation times(GL) Chandrasekharaiah and Tzou theory with dual phase lag(C-T) of thermoelasticity. The Laplace and Fourier transforms techniques are used to solve the problem. As an application, concentrated/uniformly distributed mechanical or thermal sources have been considered to illustrate the utility of the approach. The integral transforms have been inverted by using a numerical inversion technique to obtain the components of displacement, stress, changes in volume fraction field and temperature distribution in the physical domain. The effect of dependence of modulus of elasticity on the components of stress, changes in volume fraction field and temperature distribution are illustrated graphically for a specific model. Different special cases are also deduced.

Karmakar T.K.,Dn College | Ghosh M.,Bankura Christian College | Fleck M.,University of Vienna | Pilet G.,University Claude Bernard Lyon 1 | Bandyopadhyay D.,Bankura Christian College
Journal of Coordination Chemistry | Year: 2012

Four new mononuclear complexes, [Ni(L 1)(NCS) 2] (1), [Ni(L 2)(NCS) 2] (2), [Co(L 1)(N 3) 2]ClO 4 (3), and [Co(L 2)(N 3) 2]ClO 4 (4), where L 1 and L 2 are N,N′-bis[(pyridin-2-yl)methylidene]butane-1,4-diamine and N,N-bis[(pyridin-2-yl)benzylidene]butane-1,4-diamine, respectively, have been prepared. The syntheses have been achieved by reaction of the respective metal perchlorate with the tetradentate Schiff bases, L 1 and L 2, in presence of thiocyanate (for 1 and 2) or azide (for 3 and 4). The complexes have been characterized by microanalytical, spectroscopic, single crystal X-ray diffraction and other physicochemical studies. Structural studies reveal that 1-4 are distorted octahedral geometries. The antibacterial activity of all the complexes and their constituent Schiff bases have been tested against Gram-positive and Gram-negative bacteria. © 2012 Taylor & Francis.

Mandal S.,Bankura Christian College | Karmakar T.K.,Dn College | Ghosh A.,Bankura Christian College | Fleck M.,University of Vienna | Bandyopadhyay D.,Bankura Christian College
Polyhedron | Year: 2011

Five mononuclear complexes of manganese(II) of a group of the general formula, [MnL(NCS)2] where the Schiff base L = N,N′- bis[(pyridin-2-yl)ethylidene]ethane-1,2-diamine (L1), (1); N,N′-bis[(pyridin-2-yl)benzylidene]ethane-1,2-diamine (L2), (2); N,N′-bis[(pyridin-2-yl)methylidene]propane-1,2-diamine (L 3), (3); N,N′-bis[(pyridin-2-yl)ethylidene]propane-1,2-diamine (L4), (4) and N,N′-bis[(pyridin-2-yl)benzylidene]propane-1,2- diamine (L5), (5) have been prepared. The syntheses have been achieved by reacting manganese chloride with the corresponding tetradentate Schiff bases in presence of thiocyanate in the molar ratio of 1:1:2. The complexes have been characterized by IR spectroscopy, elemental analysis and other physicochemical studies, including crystal structure determination of 1, 2 and 4. Structural studies reveal that the complexes 1, 2 and 4 adopt highly distorted octahedral geometry. The antibacterial activity of all the complexes and their respective Schiff bases has been tested against Gram(+) and Gram(-) bacteria. © 2010 Elsevier Ltd. All rights reserved.

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