DR PRAVEEN BHATT | Kurukshetra University (original) (raw)

Papers by DR PRAVEEN BHATT

Indian journal of science and technology, Jan 16, 2021

The theoretical model, developed by S.P. Khare, has been modified to evaluate the total cross sec... more The theoretical model, developed by S.P. Khare, has been modified to evaluate the total cross sections for ionization of Chromium atom due to electron impact at incident electron energy from ionization threshold to 6000 eV. The various calculated cross sections are in remarkable agreement with available experimental data and other theoretical cross sections. For Chromium atom, good agreement between theory and experiment is achieved. Objective: Our objective is to find the partial and total ionization cross sections for Chromium atom and its fragmentation ion at different energy levels and interpretation of results with other available data. Method:-The theoretical semi-empirical model, developed by S.P. Khare, has been remodeling to evaluate the total cross sections for ionization of Chromium atom due to electron impact at incident electron energy from ionization threshold to 6000 eV. Findings: A good agreement is observed when we compared our data for electron impact ionization cross section for Cr 6+ , Cr 7+ , Cr 8+ and Cr 10+ fragment ions. Also some disagreement is found between our data and other available data. Our results are higher for Cr 7+ , Cr 8+ fragment ions. For Chromium atom, good agreement between theory and experiment is achieved. Novelty: Electron impact ionization is engaged to produce positive and negative ions in many areas of physics and chemistry such as plasma studies, fusion modeling, radiation physics and gas discharges to more abstract applications such as astrophysical applications and modeling of planetary atmospheres.

Turkish Online Journal of Qualitative Inquiry, Jul 1, 2021

Recent advances in electrical & electronic engineering, Sep 22, 2020

Indonesian Journal of Electrical Engineering and Informatics, Nov 20, 2019

In this paper a miniaturized quarter wavelength rectangular shaped multimode ring resonator bandp... more In this paper a miniaturized quarter wavelength rectangular shaped multimode ring resonator bandpass filter with extended diagonal corners and internally located high impedance perturbation stubs is proposed. Input/output open stubs are tightly coupled to the extended diagonal corners running parallel to the two opposite sides of the ring resonator, generate wide passband and wide stop-band. Cutoff frequencies can be shifted to the higher side by increasing the length of the sides of the resonator. By inserting the perturbation stubs, rectangular ring resonator produces three degenerate modes out of which first two form a wide passband. Small square patch is attached to the opposite interior corners of the ring resonator to improve the return loss. T-shaped stub is tightly coupled between the feeder line and longer side of the resonator to improve the insertion loss and skirt-characteristics. Shorter opposite sides of the rectangular ring resonator are bent in U-shaped to increase the effective electrical length of the resonator eventually the bandwidth is widened. Filter is designed and simulated for the center frequency of 3.2 GHz, bandwidth from 2.0 GHz to 4.0 GHz, on dielectric constant 3.38 and thickness 0.508 mm. Electromagnetic simulator Ansoft HFSS is used to optimize the filter dimensions.

Journal of Electron Spectroscopy and Related Phenomena, Mar 1, 2003

Electron-impact-ionization cross sections have been computed for ArII, KIII, ScV, and FeX in a di... more Electron-impact-ionization cross sections have been computed for ArII, KIII, ScV, and FeX in a distorted-wave Born exchange approximation. For Ar II, the theoretical results are in good agreement with available experimental data. An analytic fit to the data is provided.

A B S T R A C T :-We have made a study of the total and partial ionization cross-sections of a So... more A B S T R A C T :-We have made a study of the total and partial ionization cross-sections of a Sodium atom caused by electron impact for a single ionization. Electron-impact ionization cross-sections (EIICS) have been calculated from threshold ionization energy to 2240 eV. The theoretical model, developed by Jain and Khare, has been used to calculate the EIICS for Sodium. We observed the following product ions: Na + , Na 2+ , Na 3+ , Na 4+ , Na 5+ , Na 6+, Na 7+ and Total. The predicted EIICS of Potassium for all seven fragment ions are compared with other theoretical and experimental data. The present model shows a good agreement with the previously reported data. * (2017) All right reserved. K E Y WO R D S : Ionization Cross Section, Electron impact ionization

The proposed filter is an advanced microstrip bandpass filter in which many shortcomings of the t... more The proposed filter is an advanced microstrip bandpass filter in which many shortcomings of the traditional BPF is tried to fix. We proposed an eight-pole half-wavelength microstrip bandpass cascaded quadruplet filter. It has two transmission zeros at finite frequencies due to two cross couplings. High selectivity is achieved by introducing the cross coupling between the resonators. Speciality of the proposed filter is, its easy and simple tunability which has a demand in high-speed digital transmission systems. Bandwidth of the filter can be easily controlled by changing the position of the tapped line Proposed filter is realized for centre frequency 0.850 GHz on substrate RT/Duroid of thickness 1.27 mm and 10.8 relative dielectric constant. Design is simulated on IE3D.

Electron-impact ionization is one of the basic collision processes for atoms and molecules and is... more Electron-impact ionization is one of the basic collision processes for atoms and molecules and is studied not only for its intrinsic importance. But also for a wide range of applications. Such as in fusion plasma diagnostics, radiation effects on materials and astrophysics, bromine is one of the more important diagnostic elements This may overcome the first-, wall problems in fusion devices and can also cause the: flux of particles recycling back from the wall and refueling the plasma to become very low. It is important, therefore, to have accurate data for electron-impact ionization processes. Even though the cross sections for singly and multiply charged ions decline rapidly with increasing stage of ionization, multiple ionization processes are important in fusion plasmas and in other environments with an abundance of energetic electrons.

A B ST R A C T : We studied electron impact ionization of tetramethylsilane (TMS), Si(CH3)4, whic... more A B ST R A C T : We studied electron impact ionization of tetramethylsilane (TMS), Si(CH3)4, which is utilized in plasma polymerization applications, using a semi empirical Jain-Khare theoretical technique. Absolute partial cross sections for the formation of all fragment ions were measured by Jain-Khare method from threshold up to 120 eV. We obtained the following sixteen ions: CH3, Si, SiH, SiH3, SiCH2, SiCH3, HSiCH3, H2SiCH3, SiC2H, SiC2H3, SiC2H5,Si(CH3)2, HSi(CH3)2, Si(CH3)3, HSi(CH3)3 & Si(CH3)4. The agreement between our measured absolute partial ionization cross-sections & R.Basner et al data sets obtained by experimental technique are generally good for the silicon-containing fragment ions. The earlier work done is for 90 eV & here we have extended it up to from threshold to 120 eV.

This article describes the theoretical models for determination of electron-impact ionization cro... more This article describes the theoretical models for determination of electron-impact ionization cross-section, which has been applied to atoms, ions, and molecules. The model combines the Bethe theory and binary-encounter theory for electron-impact ionization called the binary-encounter Bethe (BEB) model that use the binding energy and average kinetic energy of each subshell that prescribes differential ionization cross section for that shell and S. P. Khare and co-workers give the new Formalism by combining Bethe and Mott's cross-section known as Jain-Khare Formalism are discussed here. Copy

A novel fifth order Chebyshev stepped impedance low pass filter is designed, simulated and fabric... more A novel fifth order Chebyshev stepped impedance low pass filter is designed, simulated and fabricated. Parameters of circuit are extracted from the EM design equations and then values are optimized. Defected ground structures (DGS) have been developed to enhance different characteristics like wide stop band, frequency response, flat pass band and minimum ripples etc. of many microwave devices. In this paper we designed and fabricated fifth order low pass filter and the characteristic of this low pass filter is improved when this filter is designed with dumbbell Shaped Slot Defected Ground Structure (DGS). The response of the filter is analyzed with respect to variation in dimension of the GS unit. The variation of dimensions of defects studied with their corresponding change in capacitance, inductance as well as frequency response. The defects dimensions are modeled with respect to the frequency. Chebyshev stepped impedance five pole DGS is adopted to increase the bandwidth of stopb...

1tary Editor Ouy tirifEn wry I) It ,N mg I. ti.e on its laurels rhaps this is not entirely true; ... more 1tary Editor Ouy tirifEn wry I) It ,N mg I. ti.e on its laurels rhaps this is not entirely true; perhap, the band is not deteriorating. But when the call seas issued tor band members to perform oil Monday of this week, the response was nit w hat it should have been. When the University was entertaming as guests, the Committee on Education of the State Legislature, the band '96 did not present as good a performance '23 .23 as might have been expected.

Journal of Chemistry and Chemical Sciences, 2018

Indian Journal of Science and Technology, 2021

This paper proposed a synthesis of miniaturized U-shaped parallel coupled band pass filter. U-sha... more This paper proposed a synthesis of miniaturized U-shaped parallel coupled band pass filter. U-shaped BPF is originally a stair type parallel coupled BPF which is a modified structure realized by folding the arms of traditional stair type parallel coupled bandpass filter. U-shape filter consists of half wavelength long resonators and is designed using J-inverters. In this paper comparison has been made between the tradition stair type parallel coupled BPF and the U-shaped parallel coupled BPF on the basis of same parameters. Filter is designed for the centre frequency 10 GHz, dielectric constant 10.2 and dielectric height 0.635 mm. Proposed filter gained a FBW of 1% and reduction in size 40.7% compare to the tradition stair type parallel coupled BPF. Electromagnetic simulation software IE3D is implemented to design and optimize the filter. Index Terms — even and odd modes, IE3D, insertion loss, return loss, stair type Parallel coupled BPF, U-shaped Parallel coupled BPF. ——————————  ...

This paper represents the comparison between the end coupled BPF and Parallel coupled BPF with th... more This paper represents the comparison between the end coupled BPF and Parallel coupled BPF with the same parameters. Parallel coupled BPF has merits over end coupled BPF. The occupied area of the parallel coupled BPF is less compared to end coupled BPF. Bandwidth of the parallel coupled BPF is large compared to end coupled. Return loss and insertion loss of parallel coupled BPF has less compared to end coupled. The only advantage of end coupled BPF is its simple design equations and less complex geometry and easy fabrication. These two filters are designed at high centre frequency 10.2 GHz and high dielectric constant 10.2 to achieve the wideband. Full wave IE3D electromagnetic simulation software is used to design and analysis of end coupled BPF and parallel coupled BPF.

Recent Advances in Electrical & Electronic Engineering (Formerly Recent Patents on Electrical & Electronic Engineering), 2020

Background: In this paper, an ultra-wide-band bandpass filter with large stopband using interdigi... more Background: In this paper, an ultra-wide-band bandpass filter with large stopband using interdigital coupled lines and pair of Square Complimentary Split Ring Resonator (SCSRR) is proposed. Methods: Interdigital coupled lines give bandpass characteristics and pair of SCSRR provides tuning of cut off frequencies and transmission zeroes on both side of the passband. In the passband, two transmission poles are achieved. The tightly coupled structure provides a wide stopband and sharp skirt response. Results: Dielectric constant 2.6 and its thickness of 0.787 mm is used to implement the design. Centre frequency of the proposed design is 5.1 GHz. Bandwidth at -3 dB is 3.5 GHz to 6.5 GHz. Conclusion: The proposed structure is simulated in Ansoft HFSS.

Indonesian Journal of Electrical Engineering and Informatics (IJEEI)

Journal of Electron Spectroscopy and Related Phenomena, 2012

The modified Jain-Khare semi-empirical formalism for the evaluation of differential and integral ... more The modified Jain-Khare semi-empirical formalism for the evaluation of differential and integral electron impact ionization cross sections for molecules has been extended to the evaluation of cross sections for the electron ionization of CO 2 clusters: (CO 2) 240 and (CO 2) 1700. The energy dependent differential cross sections are evaluated at the incident electron energies of 50, 100 and 200 eV. The integral total ionization cross sections have been calculated in the energy range varying from ionization thresholds to 1000 eV which revealed a good agreement with the available experimental and the theoretical data. The ionization rate coefficients have also been evaluated using the presently calculated ionization cross sections and Maxwell-Boltzmann energy distributions.