Search results for: R.K. Thapa

Items from 1 to 20 out of 37 results

article

Effect of drop height on different parameters of drop jump among soccer players

R.K. Thapa, A. Kumar, D. Sharma

Trends in Sport Sciences > 2020 > 27 > 1

Introduction. Drop jump is one of the most researched plyometric exercises. Different drop heights were earlier investigated for ground reaction forces, biomechanical analysis, and other parameters. There has been no research into the influence of drop height on maximum jump height during drop jump among soccer players. Aim of Study. This study aimed to find out the optimal drop height for maximum...

article

Thermoelectric properties of tetragonal half-Heusler compounds, TiXSb (X = Ge, Si): A probe from Density Functional Theory (DFT)

H. Joshi, D.P. Rai, K.D. Verma, K.C. Bhamu, more

Journal of Alloys and Compounds > 2017 > 726 > C > 1155-1160

We have presented the electronic and thermoelectric properties of d²/d^o type Heusler compounds TiXSb (X = Ge, Si) using Full Potential Linearized Augmented Plane Wave method (FP-LAPW), based on Density Functional Theory (DFT). For electron exchange, we have considered the most common Generalized Gradient Approximation (GGA), exchange potential. The electronic structure of both TiGeSb and TiSiSb showed...

article

Investigation of the structural, electronic and optical properties of the cubic RbMF3 perovskites (M = Be, Mg, Ca, Sr and Ba) using modified Becke-Johnson exchange potential

Sandeep, D.P. Rai, A. Shankar, M.P. Ghimire, more

Materials Chemistry and Physics > 2017 > 192 > C > 282-290

The structural, electronic and optical properties of the cubic RbMF₃ perovskites (M = Be, Mg, Ca, Sr, Ba) have been investigated using the full-potential linearized augmented plane wave (FP-LAPW) method. The exchange and correlation potential was applied using the generalized gradient approximation for calculating the structural properties In addition, the modified Becke-Johnson (TB-mBJ) potential...

article

Electronic, optical and thermoelectric properties of bulk and surface (001) CuInTe2: A first principles study

D.P. Rai, Sandeep, A. Shankar, Anup Pradhan Sakhya, more

Journal of Alloys and Compounds > 2017 > 699 > C > 1003-1011

The electronic, optical and thermoelectric properties of bulk and surface of CuInTe₂ were investigated by first-principles calculation based on full potential linearized augmented plane wave (FP-LAPW) method. The electron-exchange correlation is taken as generalized gradient approximation (GGA). To improve the energy band gap a modified version of semi-local orbital independent potential called modified...

article

Electronic and optical properties of cubic SrHfO3 at different pressures: A first principles study

D.P. Rai, Sandeep, A. Shankar, Anup Pradhan Sakhya, more

Materials Chemistry and Physics > 2017 > 186 > C > 620-626

The electronic and optical properties of cubic SrHfO₃ under the variation of pressures were investigated by first-principles calculation within the framework of generalized gradient approximation (GGA). The calculated equilibrium lattice constant of cubic SrHfO₃ is in good agreement with available experimental and theoretical results. The result shows that SrHfO₃ is an insulator with an indirect band...

article

A first principles study of Nd doped cubic LaAlO3 perovskite: mBJ+U study

Sandeep, D.P. Rai, A. Shankar, M.P. Ghimire, more

Journal of Magnetism and Magnetic Materials > 2016 > 417 > C > 313-320

The structural, electronic and magnetic properties of Nd-doped Rare earth aluminate, La_1−xNd_xAlO₃ (x=0–100%) are studied using the full potential linearized augmented plane-wave (FP-LAPW) method within the density functional theory. The effects of Nd substitution in LaAlO₃ are studied using super-cell calculations. The electronic structures were computed using modified Beck Johnson (mBJ) potential...

article

Circulating fluidized bed combustion reactor: Computational Particle Fluid Dynamic model validation and gas feed position optimization

R.K. Thapa, A. Frohner, G. Tondl, C. Pfeifer, more

Computers & Chemical Engineering > 2016 > 92 > C > 180-188

A 3D Computational Particle Fluid Dynamic (CPFD) model is validated against experimental measurements in a lab-scale cold flow model of a Circulating Fluidized Bed (CFB). The model prediction of pressure along the riser, downcomer and siphon as well as bed material circulation rates agree well with experimental measurements. Primary and secondary air feed positions were simulated by varying the positions...

article

FP-LAPW calculations of the elastic, electronic and thermoelectric properties of the filled skutterudite CeRu4Sb12

A. Shankar, D.P. Rai, Sandeep Chettri, R. Khenata, more

Journal of Solid State Chemistry > 2016 > 240 > C > 126-132

We have investigated the electronic structure, elastic and thermoelectric properties of the filled skutterudite CeRu₄Sb₁₂ using the density functional theory (DFT). The full potential linearized augmented plane wave (FP-LAPW) method within a framework of the generalized gradient approximation (GGA) approach is used to perform the calculations presented here. The electronic structure calculation suggests...

article

Electronic structure and thermoelectricity of filled skutterudite CeRu4Sb12

A. Shankar, D.P. Rai, Sandeep, R. Khenata, more

Journal of Alloys and Compounds > 2016 > 672 > C > 98-103

First-principles calculations of the energy band structure and density of states of filled skutterudite CeRu₄Sb₁₂ have been performed to understand the origin of thermoelectricity. The calculations are carried out using the full potential linear augmented plane wave (FP-LAPW) method within a framework of LDA approach. CeRu₄Sb₁₂ is a metal with bands crossing Fermi energy level more than twice with...

article

A tunneling current density model for ultra thin HfO2 high-k dielectric material based MOS devices

Niladri Pratap Maity, Reshmi Maity, R.K. Thapa, Srimanta Baishya

Superlattices and Microstructures > 2016 > 95 > C > 24-32

In this paper, an analytical model for evaluation of tunneling current density of ultra thin MOS devices is presented. The impacts of the promising high-k dielectric material, HfO₂ on the current density model have been carried out. In this work, improvement in the results is brought in by taking into account the barrier height lowering due to the image force effect. The considered voltage range is...

article

Energy band structure, elastic and optical constants of the filled skutterudite CeRu4As12

A. Shankar, D.P. Rai, Sandeep, H. Joshi, more

Materials Science in Semiconductor Processing > 2016 > 46 > C > 10-16

The energy band structure and the optical response of the filled skutterudite CeRu₄As₁₂ have been studied using the full-potential linearized augmented plane wave (FP-LAPW) method within the local density approximation (LDA). The analysis of the region close to the Fermi energy level suggests the narrow band gap (0.18eV) semiconducting nature of the material. The new approach of the exchange-correlation...

chapter

Study of electronic and optical properties of boron arsenide

Rebecca Lalngaihawmi, B. Vanlalruata, Lalhriatpuia Hnamte, R.K. Thapa

2016 International Conference on Electrical, Electronics, and Optimization Techniques (ICEEOT) > 1162 - 166

2016 International Conference on Electrical, Electronics, and Optimization Techniques (ICEEOT)

The optimized crystal structure, energy band structures, density of states (DOS) of BAs were investigated using full potential linearized augmented plane wave method (FP-LAPW). The exchange-correlation potential was treated using the generalized gradient approximation (GGA). The calculated results such as band gaps are in fair agreement with the previous experimental data which is 1.2 eV.

chapter

A theoretical study of photofield emission in gallium arsenide

Leishangthem Nirmala Devi, K. Neupane, M.P. Ghimire, R.K. Thapa

2016 International Conference on Electrical, Electronics, and Optimization Techniques (ICEEOT) > 8 - 12

2016 International Conference on Electrical, Electronics, and Optimization Techniques (ICEEOT)

We have presented in this report the application of free electron potential model in the study photofield emission current (PFEC) in gallium arsenide (GaAs). The variation of photofield emission current is presented as a function of parameters like the applied high electric field, the photon energy, the initial state energy with reference to the Fermi level. Relation of change of PFEC to DOS is also...

article

Lumped Electromechanical Modeling of Capacitive Micromachined Ultrasonic Transducers

R. Maity, Ajay Singh, A. Islam, N.P. Maity, more

Materials Today: Proceedings > 2016 > 3 > 6 > 2289-2294

Conventional plane piston lead zirconium titanate (PZT) based transducers perform poorly for audio speakers and as capacitance receivers due to the lack of proper matching layer materials. Conventional designs have relatively large gaps, 50-100 μm, and use the air in the gap as the restoring force of the vibrating electrode. With the help of silicon micromachining, Capacitive Micromachined Ultrasonic...

article

The electronic, magnetic and optical properties of double perovskite A2FeReO6 (A=Sr, Ba) from first principles approach

D.P. Rai, A. Shankar, M.P. Ghimire, Sandeep, more

Computational Materials Science > 2015 > 101 > C > 313-320

A density functional theory (DFT) employing generalized gradient approximation (GGA) and modified Becke Johnson (TB-mBJ) potential have been used to study the electronic, magnetic and optical properties of A2FeReO6 (AFRO). The presence of indirect band gap of majority electrons at EF and the conducting behaviour of minority electrons predicts these materials to be a half metallic ferrimagnets. The...

article

Study of 5f electron based filled skutterudite compound EuFe4Sb12, a thermoelectric (TE) material: FP-LAPW method

A. Shankar, D.P. Rai, R. Khenata, J. Maibam, more

Journal of Alloys and Compounds > 2015 > 619 > C > 621-626

We have studied the elastic, electronic and magnetic properties along with the thermoelectric properties of an undoped filled skutterudite EuFe₄Sb₁₂ using full-potential linearized augmented plane wave (FP-LAPW) method. The LSDA, LSDA+U and a new exchange-correlation functional called modified Becke Johnson (mBJ) potential based on density functional theory (DFT) were used for studying material properties...

article

Interface Charge Density Measurement for Ultra Thin ZrO2 Material Based MOS Devices Using Conductance Method

N.P. Maity, R.R. Thakur, Reshmi Maity, R.K. Thapa, more

Procedia Computer Science > 2015 > 57 > Complete > 761-765

The metal oxide semiconductor (MOS) conductance technique has been a key tool for the understanding of electrically active interface states since it was first developed by Nicollian and Brews in the mid 1960's. In this letter the interface charge densities (D_it) are analyzed for ultra thin dielectric material based MOS devices using high-k dielectric material ZrO₂ at p-type doping level of 1x10¹⁷...

article

Analysis of Interface Charge Using Capacitance-Voltage Method for Ultra Thin HfO2 Gate Dielectric Based MOS Devices

N.P. Maity, R.R. Thakur, Reshmi Maity, R.K. Thapa, more

Procedia Computer Science > 2015 > 57 > Complete > 757-760

In this paper, we have calculated Flatband voltage (V_fb) in terms of interface trap charges, fixed oxide charges and oxide trapped charges for ultra thin oxide Metal Oxide Semiconductor (MOS) Devices using SiO₂ and HfO₂ has been methodically investigated. The interface charges are designed using capacitance-voltage (C-V) method. It indicates that by reducing the oxide thickness, the interface charges...

article

Study of electronic, magnetic, optical and elastic properties of Cu2MnAl a gapless full Heusler compound

D.P. Rai, R.K. Thapa

Journal of Alloys and Compounds > 2014 > 612 > Complete > 355-360

The full potential linearized augmented plane wave method with the generalized gradient approximation (FPLAPW-GGA) has been used to understand the electronic, magnetic, optical and elastic properties of Cu ₂ MnAl a full-Heusler compound. The total and partial density of states (DOS), elastic constants, bulk modulus, shear modulus, Young modulus, Poisson ratio and optical constants like complex...

article

Prediction of half-metallic ferromagnetism (HMF) in hypothetical Heusler compound Co2VSb using modified Becke Johnson (mBJ) potential

D.P. Rai, J. Maibam, B.I. Sharma, A. Shankar, more

Journal of Alloys and Compounds > 2014 > 589 > Complete > 553-557

In search of half-metallic ferromagnetism, we have studied the electronic and magnetic properties of Co ₂ VSb by using the different tools like GGA, LSDA+U and mBJ potential based on density functional theory (DFT). The compound Co ₂ VSb is analogous to Co ₂ VAl, Co ₂ VSn and Co ₂ VGa , these compounds were studied theoretically and experimentally by Buschow...

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INFONA - science communication portal

Search results for: R.K. Thapa

Effect of drop height on different parameters of drop jump among soccer players

Thermoelectric properties of tetragonal half-Heusler compounds, TiXSb (X = Ge, Si): A probe from Density Functional Theory (DFT)

Investigation of the structural, electronic and optical properties of the cubic RbMF3 perovskites (M = Be, Mg, Ca, Sr and Ba) using modified Becke-Johnson exchange potential

Electronic, optical and thermoelectric properties of bulk and surface (001) CuInTe2: A first principles study

Electronic and optical properties of cubic SrHfO3 at different pressures: A first principles study

A first principles study of Nd doped cubic LaAlO3 perovskite: mBJ+U study

Circulating fluidized bed combustion reactor: Computational Particle Fluid Dynamic model validation and gas feed position optimization

FP-LAPW calculations of the elastic, electronic and thermoelectric properties of the filled skutterudite CeRu4Sb12

Electronic structure and thermoelectricity of filled skutterudite CeRu4Sb12

A tunneling current density model for ultra thin HfO2 high-k dielectric material based MOS devices

Energy band structure, elastic and optical constants of the filled skutterudite CeRu4As12

Study of electronic and optical properties of boron arsenide

A theoretical study of photofield emission in gallium arsenide

Lumped Electromechanical Modeling of Capacitive Micromachined Ultrasonic Transducers

The electronic, magnetic and optical properties of double perovskite A2FeReO6 (A=Sr, Ba) from first principles approach

Study of 5f electron based filled skutterudite compound EuFe4Sb12, a thermoelectric (TE) material: FP-LAPW method

Interface Charge Density Measurement for Ultra Thin ZrO2 Material Based MOS Devices Using Conductance Method

Analysis of Interface Charge Using Capacitance-Voltage Method for Ultra Thin HfO2 Gate Dielectric Based MOS Devices

Study of electronic, magnetic, optical and elastic properties of Cu2MnAl a gapless full Heusler compound

Prediction of half-metallic ferromagnetism (HMF) in hypothetical Heusler compound Co2VSb using modified Becke Johnson (mBJ) potential

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