Samrat Ashok Technological Institute
Vidisha, India

Samrat Ashok Technological Institute is a Grant-in-Aid Autonomous college in Vidisha, in the central Indian state of Madhya Pradesh. It was established by Late Maharaja Jiwajirao Scindia on November 1, 1960 with a donation from Gangajali Trust fund. It is an autonomous institute, which is fully funded by Government of Madhya Pradesh and managed by the Maharaja Jiwaji Rao Education Society chaired by Hon'ble Shrimant Jyotiraditya Madhavrao Scindia. The institute started with B.E. in Civil Engineering, Mechanical Engineering & Electrical Engineering. The institute now offers nine full-time and six Part-time undergraduate courses leading to degree in Bachelor of Engineering and sixteen Postgraduate courses in the areas of Engineering, Science and Management. The college campus is spread over an area of 85 acres of lush green land with natural surroundings.Check Facebook Page Wikipedia.

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Parashar J.,Samrat Ashok Technological Institute
AIP Conference Proceedings | Year: 2015

Terahertz radiation generation via nonlinear mixing of two laser beams incident over a thin metal foil is explored. The lasers exert a ponderomotive force on the electrons of metal foil at beat frequency which lies in the terahertz range. The metal foil acts as antenna, producing terahertz radiations, highly directional in nature. © 2015 AIP Publishing LLC.

Jain H.,CSIR - Central Electrochemical Research Institute | Tripathi J.,Samrat Ashok Technological Institute
Materials Today: Proceedings | Year: 2015

In this research paper a new approach for the optimization and evaluation of machining parameters for turning operation on Inconel-625 on CNC machining with the help of Taguchi Methods is presented. Taguchi Parameter Design is a powerful and efficient method for optimizing quality and performance output of manufacturing processes, thus a powerful tool for meeting this challenge. The main objective of this investigation is to obtain an optimal setting of process parameters in turning for maximizing the material removal rate of the manufactured component, the MRR has been investigated by the analysis while machining practically used component. As per Taguchi 'DOE', the number of experiments to be conducted in this analysis very systematic and well calculated, the turning operations are performed as per the machining conditions shown in the orthogonal array. The data for calculating material removal rate in all the test conditions are observed and recorded. The result of this analysis identifies the optimal values of process parameters for effective and efficient machining. The results from confirmation runs indicated that the determined optimal combination of machining parameters improved the performance of the machining process. © 2015 Elsevier Ltd.

Parashar J.,Samrat Ashok Technological Institute
Integrated Photonics Research, Silicon and Nanophotonics, IPRSN 2015 | Year: 2015

A metal coated, rippled core optical fiber supports a surface plasma wave. The surface plasma wave produces a resonant second harmonic as the ripple provides the additional momentum required to compensate for the phase mismatch between second harmonic and fundamental wave. © 2015 OSA.

Parashar J.,Samrat Ashok Technological Institute
Physics of Plasmas | Year: 2013

A surface plasma wave propagating over the rippled metallic surface produces static magnetic field via nonlinear coupling of electron velocity with density ripple. The generated magnetic field shows a resonant enhancement at particular values of ripple number. Magnetic field strength is also sensitive to plasma density and decreases at lower plasma densities. The generated magnetic field over a rippled metallic field is larger by an order of magnitude as compared to a planar metallic surface. © 2013 AIP Publishing LLC.

Datar A.,Samrat Ashok Technological Institute | Jain A.,Samrat Ashok Technological Institute | Sharma P.C.,P.A. College
Digital Signal Processing: A Review Journal | Year: 2013

In this paper, design and comparative analysis of adjustable window functions based cosine modulated filter banks are analyzed. Four adjustable windows, viz., Kaiser window, Saramäki window, ultraspherical windows and Roark's transitional window are used to design prototype filters. Reconstruction error, which is used as an objective function, is minimized by optimizing the cutoff frequency of designed prototype filters. The gradient based iterative optimization algorithm is used. These optimized filters are later cosine modulated to obtain filter banks. The performances of filter banks are compared on the basis of reconstruction error and aliasing error. © 2012 Elsevier Inc. All rights reserved.

Datar A.,Samrat Ashok Technological Institute | Jain A.,Samrat Ashok Technological Institute | Sharma P.C.,P.A. College
Signal Processing | Year: 2010

In this paper, Kaiser window based design of prototype filter for cosine modulated filter banks is presented. The reconstruction error, which is used as an objective function, is minimized by optimizing the cutoff frequency of designed prototype filter. Linear search optimization algorithm is employed. The results show significant reduction in reconstruction error compared to other earlier reported works. © 2009 Elsevier B.V. All rights reserved.

Parashar J.,Samrat Ashok Technological Institute
International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz | Year: 2014

Terahertz excitation by beating two collinear lasers, propagating at an angle to density gradient in plasma, is investigated. The lasers exert a ponderomotive force on electrons that creates beat frequency current density JNL with V×JNL ≠0. This excites electromagnetic radiation. For a parabolic density profile with density peak slightly less than the critical density, the beat wave amplitude acquires large values near the density peak and saturates. © 2014 IEEE.

Parashar J.,Samrat Ashok Technological Institute | Sharma H.,Samrat Ashok Technological Institute
Physica E: Low-Dimensional Systems and Nanostructures | Year: 2012

Terahertz radiation generation via optical rectification of an amplitude modulated laser in an array of carbon nanotubes is explored. The laser of finite spot size, traveling perpendicular to the nanotubes, exerts a ponderomotive force on free electrons of nanotubes at the modulation frequency Ω. It sets in resonant electron oscillations of nanotubes whereby each nanotube acts as an oscillatory electric dipole, producing terahertz radiation. © 2012 Elsevier B.V.

Chaturvedi P.K.,Samrat Ashok Technological Institute | Jain S.,Maulana Azad National Institute of Technology | Agarwal P.,Indian Institute of Technology Roorkee
IET Power Electronics | Year: 2011

Multilevel inverters are used to reduce the harmonics and to achieve high-voltage, high-power capability but switching losses are increased because of increased device count. Switching losses can be reduced by either soft switching techniques or by modifying modulation technique employing space vector-based PWM techniques or sinusoidal PWM-based techniques. In this study, a carrier-based closed-loop control technique has been developed to reduce the switching losses based on insertion of 'no switching' zone within each half cycle of fundamental wave. It effectively reduces the switching losses of three-level inverter without need of any complex mathematical expressions as involved in space vector-based techniques. An improvement of about 5% in efficiency for a switching frequency of 5 kHz is observed with proposed technique over conventional SPWM technique based on efficiency improvement factor (EIF). Simulation and experimental results are presented to validate the proposed technique. © 2011 The Institution of Engineering and Technology.

Chaturvedi P.,Samrat Ashok Technological Institute | Jain S.,Maulana Azad National Institute of Technology | Agarwal P.,Indian Institute of Technology Roorkee
IEEE Transactions on Industrial Electronics | Year: 2014

This paper presents the design and implementation of a simple neutral point potential (NPP) regulator for a three-level diode-clamped inverter employing a sine-triangle regulator in conjunction with a closed-loop controller with reduced switching losses. The regulator principle is based on adding a continuous variable offset voltage which regulates the midpoint potential of the dc bus. The novelty of the proposed NPP regulator is in the determination of the magnitude of variable offset voltage based upon the average value, peak-to-peak amplitude, total harmonic distortions, and third harmonic content in NPP. Aside from maintaining dc-bus voltage balance, the proposed regulator leads to a significant reduction in the voltage distortion at the NP, resulting in the reduction of the required dc-bus capacitance. It also reduces the switching losses of the inverter by inserting the 'no-switching' zone within each half cycle of the fundamental voltage wave. Analytical, computer simulation, and experimental results verifying the approach are presented in this paper for various load power factor angles. © 1982-2012 IEEE.

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