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Second harmonic generation of high power Cosh-Gaussian beam in cold collisionless plasma

Communications in Theoretical Physics 2022年第10期74卷 127-135页

作者： Keshav Walia Kulkaran Singh deepak tripathi Department of Physics DAV UniversityJalandharIndia Department of Physics AIASAmity UniversityNoidaIndia

The purpose of this study is to explore the second harmonic generation(SHG)of a high power Cosh-Gaussian beam in cold collisionless *** ponderomotive force causes carrier redistribution from high field to low field region in presence of a Cosh-Gaussian beam thereby producing density gradients in the transverse *** density gradients so produced the results in electron plasma wave(EPW)generation at the frequency of the input *** EPW interacts with the input beam resulting in the production of 2nd *** and paraxial approximations are employed for obtaining the 2nd order differential equation describing the behavior of the beam’s spot size against normalized *** impact of well-established laser-plasma parameters on the behavior of the beam’s spot size and SHG yield are also *** focusing behavior of the beam and SHG yield is enhanced with an increase in the density of plasma,the radius of the beam and the decentred parameter,and with a decrease in the intensity of the *** results of the current problem are really helpful for complete information of laser-plasma interaction physics.

关键词： second harmonic generation cold collisionless plasma ponderomotive force electron plasma wave Cosh-Gaussian beam

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Investigation of Weakly Relativistic Ponderomotive Effects on Self-Focusing During Interaction of High Power Elliptical Laser Beam with Plasma

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Communications in Theoretical Physics 2017年第8期67卷 245-249页

作者： Keshav Walia deepak tripathi Yachna Tyagi Department of Physics DAV University Jalandhar Department of Physics AIAS Amity University Noida

This paper presents an investigation of weakly relativistic ponderomotive effects on self-focusing during interaction of high power elliptical laser beam with plasma. The nonlinear differential equations for the beam width parameters of elliptical laser beam have set up by using Wentzal–Krammers–Brillouin(WKB) and paraxial approximations. These equations have been solved numerically by using fourth order Runge–Kutta method to study the variation of these beam width parameters against normalized distance of propagation. Effects of variation in laser beam intensity,plasma density and electron temperature on the beam width parameters are also analyzed.

关键词：高功率激光束等离子体密度相互作用动力效应弱相对论自聚焦椭圆非线性微分方程

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One-Pot Green Synthesis of 1, 4-Dihydropyridine Derivatives Using Polyindole TiO2 Nanocatalyst by Solvent Free Method

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Open Journal of Composite Materials 2024年第3期14卷 109-123页

作者： deepak Babasaheb Phasage Sanjay K. Sharma Balram tripathi Sonia Chahar Srivastava Department of Chemistry JECRC University Jaipur India S. S. Jain Subodh PG College Jaipur India

This study used a Polyindole in combination with TiO2 nanocatalyst as an efficient heterogeneous catalyst to carry out a multi-component Hantzsch reaction involving different aromatic aldehydes with methyl acetoacetate, and aqueous ammonium to create 1,4-dihydropyridine derivatives under solvent free condition at ambient temperature. A broad range of aldehydes and methyl acetoacetates, ranging from heteroaromatic to polyaromatic one, with high level of functional group tolerance can be used to provide the desired products possessing relevant medicinal moiety in high yields. This technology has prospective advantages over current protocols, including the utilization of a cheap, stable, recyclable, and safe catalyst, quicker reaction times with higher yields and simple product isolation.

关键词： TiO2 Nanocatalyst Green Synthesis Surface Morphology

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Quantifying synovial inflammation:Emerging imaging techniques

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World Journal of Rheumatology 2014年第3期4卷 72-79页

作者： deepak tripathi Vikas Agarwal Department of Clinical Immunology Sanjay Gandhi Post Graduate Institute of Medical SciencesLucknow UP 226014India

Imaging techniques to assess synovial inflammation includes radiography, ultrasound, computed tomography, magnetic resonance imaging(MRI) and recently positron emission tomography. The ideal objective of imaging approaches are to quantify synovial inflammation by capturing features such as synovial hyperplasia, neo-angiogenesis and infiltration of immune cells in the synovium. This may enable clinicians to estimate response to therapy by measuring the improvement in the inflammatory signals at the level of synovium. Ultrasound can provide information regarding thickening of the synovial membrane and can reveal increased synovial blood flow using power Doppler technique. Bone marrow edema and synovial membrane thickness on MRI scan may serve as indicators for arthritis progression. Enhancement of the synovium on dynamic contrast MRI may closely mirror the inflammatory activity in the synovium. Diffusion tensor imaging is an advance MRI approach that evaluates the inflammation related to cell infiltration or aggregation in an inflamed synovium. In this review, we summarize the newer imaging techniques and their developments to evaluate synovial inflammation.

关键词： Synovitis Imaging Diffusion tensor imaging Positron emission tomography Computed tomography Ultrasound

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Study on the Effect of Carboxyl Terminated Butadiene Acrylonitrile (CTBN) Copolymer Concentration on the Decomposition Kinetics Parameters of Blends of Glycidyl Epoxy and Non-Glycidyl Epoxy Resin

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International Journal of Organic Chemistry 2011年第3期1卷 105-112页

作者： Garima tripathi deepak Srivastava 不详

The degradation of the epoxy system was studied for the prepared six blend samples with the incorporation of 0 wt% - 25 wt% carboxyl terminated butadiene acrylonitrile (CTBN) copolymer, on a dynamic basis using Thermo gravimetric analysis (TGA) technique under a nitrogen atmosphere. The blends were prepared by physical mixing and were cured with diamine. The degradation of each sample followed second-order degradation kinetics, which was calculated by Coats-Redfern equation using best-fit analysis. This was further confirmed by linear regression analysis. The validity of data was checked by t-test statistical analysis. From this value of reaction order, activation energy (E), and pre-exponential factor (Z) were calculated. It was found that the activation energy increased with the addition of liquid elastomer.

关键词： Diglycidyl Ether of Bis-Phenol-A Cycloaliphatic Epoxy Resin Carboxyl Terminated Butadiene Acrylonotrile (CTBN) Copolymer Thermogravimetric Analysis (TGA) Degradation Kinetics

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