Government Polytechnic for Girls

Patiāla, India

Government Polytechnic for Girls

Patiāla, India
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Panchal J.M.,Government Engineering College | Joshi M.,Government Polytechnic for Girls | Gajjar P.N.,Gujarat University
Advanced Science Letters | Year: 2016

Structural stability of alkali hydrides at high pressure is studied using the plane wave pseudopotential density functional theory. The high pressure phase transition from rock-salt (RS) (B1) to cesium chloride (CS) (B2) phase are predicted for the same. The calculated phase transition pressures and equation of state are in excellent agreement with experimental results. The band structure plot along the major symmetry directions for these wide band gap hydrides are reported along with corresponding density of state and partial density of states. The phase stability of structure at ambient conditions is discussed on the basis of vibrational properties. Moreover, thermo-physical property like temperature-dependent heat capacity, entropy, free energy, and the Debye temperature are computed for all the alkali hydrides and compared well with those reported in literature. © 2016 American Scientific Publishers. All rights reserved.


Panchal J.M.,Government Engineering College | Panchal J.M.,Gujarat University | Joshi M.,Government Polytechnic for Girls | Gajjar P.N.,Gujarat University
AIP Conference Proceedings | Year: 2016

High pressure structural and electronic properties of Lithium Fluoride (LiF) have been studied by employing an ab-initio pseudopotential method and a linear response scheme within the density functional theory (DFT) in conjunction with quasi harmonic Debye model. The band structure and electronic density of states conforms that the LiF is stable and is having insulator behavior at ambient as well as at high pressure up to 1 Mbar. Conclusions based on Band structure, phonon dispersion and phonon density of states are outlined. © 2016 Author(s).


Panchal J.M.,Government Engineering College | Panchal J.M.,Gujarat University | Joshi M.,Government Polytechnic for Girls | Gajjar P.N.,Gujarat University
AIP Conference Proceedings | Year: 2016

A first-principles plane wave self-consistent method with the ultra-soft-pseudopotential scheme in the framework of the density functional theory (DFT) is performed to study structural, electronic and vibrational properties of LaP for Rock-salt (NaCl/Bl) and Cesium-chloride (CsCl/B2) phases. The instability of Rock-salt (NaCl/Bl) phases around the transition is discussed. Conclusions based on electronic energy band structure, density of state, phonon dispersion and phonon density of states in both phases are outlined. The calculated results are consistence and confirm the successful applicability of quasi-harmonic phonon theory for structural instability studies for the alloys. © 2016 Author(s).


Shah N.H.,Gujarat University | Patel D.G.,Government Polytechnic for Girls
Control and Cybernetics | Year: 2015

In this paper, an inventory system is analyzed regarding a trended demand. The seller offers its buyer a credit period for settling the account, which attracts more buyers and enhances market demand. However, the offer of credit period leads to default risk for the supplier. The units in inventory are deteriorating continuously and also have definite maximum lifetime. The aim is to maximize the profit of the retailer. Numerical examples are given to validate the developed mathematical model. Sensitivity analysis is performed to obtain the critical inventory parameters and deduce the managerial strategies.


Kaleka J.S.,Government Polytechnic for Girls | Kaleka J.S.,Government of Punjab
International Conference on Circuits, Systems and Signals - Proceedings | Year: 2010

One of the most important characteristics in automatic speech recognition (ASR) lies in the type of the speech. Discrete speech consists of isolated words, which are separated by silences (usually 100ms or more), while with continuous speech, words will be spoken without silences. The advantage of discrete speech is that the word boundaries can be determined exactly. Dynamic Time Warping is a technique for aligning some new recording with some known one. DTW is a cost minimization matching technique, in which a test signal is stretched or compressed according to a reference template. DTW is widely used in the small-scale embedded-speech recognition systems such as those embedded in cell phones. The reason for this is owing to the simplicity of the hardware implementation of the DTW engine, which makes it suitable for many mobile devices.


Shah N.H.,Gujarat University | Patel D.G.,Government Polytechnic for Girls
OPSEARCH | Year: 2015

The seller offers its buyer a credit period to settle the account which attracts more buyers and boosts market demand. However, the offer of credit period leads to default risk for the supplier. In this study, the seller is the decision maker. The demand is considered to be increasing with time and is dependent of permissible trade credit. The default risk in incurring in sales revenue is incorporated in objective of profit maximization. The necessary and sufficient conditions to obtain the seller’s optimal decision about setting the permissible credit period and purchase quantity are discussed. A procedure to determine the optimal solution is outlined. Finally, the numerical example is given to illustrate the theoretical results and sensitivity analysis is carried out to deduce some managerial insights. © 2014, Operational Research Society of India.


Upla K.P.,S V National Institute Of Technology | Joshi M.V.,Dhirubhai Ambani Institute of ICT | Gajjar P.P.,Government Polytechnic for Girls
IEEE Transactions on Geoscience and Remote Sensing | Year: 2015

In this paper, we propose a new approach for multiresolution fusion using contourlet transform (CT). The method is based on modeling the low spatial resolution (LR) and high spectral resolution multispectral (MS) image as the degraded and noisy version of their high spatial resolution version. Since this is an ill-posed problem, it requires regularization in order to obtain the final solution. In this paper, we first obtain the initial estimate of the fused image from the available MS image and the panchromatic (Pan) image by using the CT domain learning. Since CT provides better directional edges, the initial estimate has better edge details. Using the initial estimate, we obtain the degradation that accounts for the aliasing between the LR MS image and fused image. Regularization is carried out by modeling the texture of the final fused image as a homogeneous Markov random field (MRF) prior, where the MRF parameter is estimated using the initial estimate. The use of MRF prior on the final fused image takes care of the spatial dependencies among the pixels. A simple gradient-based optimization technique is used to obtain the final fused image. Although we use homogeneous MRF, the proposed approach preserves the edges in the final fused image by retaining the edges from the initial estimate and by carrying out the optimization on nonedge pixels only. Therefore, the advantage of the proposed method lies in preserving the discontinuities without using the discontinuity preserving prior, thus avoiding the use of computationally taxing optimization techniques for regularization purposes. In addition, the proposed method causes minimum spectral distortion since it learns the texture using contourlet coefficients and does not use actual Pan image pixel intensities. We demonstrate the effectiveness of our approach by conducting the experiments using subsampled and nonsubsampled CT on different data sets captured using Ikonos-2, Quickbird, and Worldview-2 satellites. © 1980-2012 IEEE.


Kumar M.,LDRP Institute of Technology and Research | Josh M.,Government Polytechnic for Girls | Gajjar P.N.,Gujarat University | Jani A.R.,Sardar Patel University
Solid State Phenomena | Year: 2014

The knowledge of the physical properties of liquid Pb-Bi alloys and those of eutectic composition especially, is of high scientific and practical importance. In present paper temperature dependent electrical conductivity as well as thermoelectric power of liquid Pb-Bi eutectic (Pb- 55.9%Bi) is studied in the framework of Ziman formalism through an electron-ion potential. Partial structure factor is calculated from the Faber-Ziman approach. The dependency of conductivity is interpreted alongwith various screening functions. The results are compared with experimental findings and the effect of screening function on conductivity is discussed. This elucidates that the conductivity data of liquid Pb-Bi system are in qualitative agreement with the nearly-free electron picture © (2014) Trans Tech Publications, Switzerland.


Upla K.P.,Sardar Vallabhbhai National Institute of Technology, Surat | Joshi M.V.,Dhirubhai Ambani Institute of ICT | Gajjar P.P.,Government Polytechnic for Girls
International Geoscience and Remote Sensing Symposium (IGARSS) | Year: 2014

In this paper, we propose a fast method for pan-sharpening based on difference of Gaussians (DoGs). The Panchromatic (Pan) and the multi-spectral (MS) images are used to obtain a pan-sharpened image having both high spectral and spatial resolutions. The method is based on two level DoG on the Pan image. First, the Pan image is convolved with Gaussian kernel to obtain a blurred version and the high frequency details are extracted as the first level DoGs by subtracting the blurred image from the original. In order to get the second level DoG, same steps are repeated on the blurred Pan image. The extracted details at both DoGs are added to MS image to obtain the final pan-sharpened image. Experiments have been conducted with different values of standard deviation of Gaussian blur with images captured from different satellite sensors such as Ikonos-2, Quickbird and Worlview-2. A relatively new quality measure with no reference (QNR) index along with the other traditional measures are evaluated to check the efficacy of the proposed algorithm. The subjective and the quantitative assessment show that the proposed technique performs better, fast and less complex when compared to recently proposed state of the art techniques. © 2014 IEEE.


Panchal J.M.,Government Engineering College | Joshi M.,Government Polytechnic for Girls | Gajjar P.N.,Gujarat University
Phase Transitions | Year: 2016

A first-principles plane wave self-consistent method with the Ultrasoftpseudopotential scheme in the framework of density functional theory is performed to study the high pressure structural, electronic and vibrational properties of InX (X = N, P) for the zinc-blende (ZnS/B3), rock-salt (NaCl/B1) and cesium-chloride (CsCl/B2) phases. We also calculate the phase transition pressures among these different phases. Conclusions based on electronic energy band structure, phonon dispersion and phonon density of states at high pressure phases along phase transition regions are outlined. © 2015 Taylor & Francis.

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