S Panda
Articles written in Pramana – Journal of Physics
Volume 27 Issue 4 October 1986 pp 523-536 Particle Physics
Field theoretic model of composite particles: a variational approach
We consider here a variational method for describing composite particles. We use equal time anticommutators/commutators, and regard the field operators as arbitrary except for the constraint from the above. The expectation value of the Hamiltonian is extremized both with respect to the field operators and with respect to the wave functions, the former extremization being the new feature here. Comparison with other calculations has been made, and correspondence with them has also been established. We further show here how an “effective mass” can arise from a potential.
Volume 35 Issue 1 July 1990 pp 21-34
Static baryon properties in a relativistic quark model with centre-of-mass correction
The static properties such as magnetic moments, charge radii and axial vector coupling constant ratios of the quark core of baryons in the nucleon octet have been calculated in an independent-quark model based on the Dirac equation with equally mixed scalar-vector potential in linear form in the current quark mass limit. The results obtained with appropriate corrections due to centre-of-mass motion are in reasonable agreement with experimental data. The magnetic moments of the quark core of baryons in the charmed and
Volume 37 Issue 1 July 1991 pp 47-56
Weak electric and magnetic form factors for semileptonic baryon decays in a relativistic quark model
Weak electric and magnetic form factors for semileptonic baryon decays are calculated in a relativistic quark model based on the Dirac equation with the independent-quark confining potential of the form
Volume 56 Issue 6 June 2001 pp 809-822 Research Articles
Analytic methods for field induced tunneling in quantum wells with arbitrary potential profiles
Electric field induced tunneling is studied in three different types of quantum wells by solving time-independent effective mass equation in analytic methods based on three different Airy function approaches. Comparison of different Airy function methods indicates that they are identical and connected to each other by the Breit-Wigner formula.
Volume 67 Issue 4 October 2006 pp 735-742 Working Group 2: Neutrino And Astroparticle Physics
Working group report: Astroparticle and neutrino physics
Raj Gandhi Subhendra Mohanty Tarun Souradeep S Agarwalla K Bhattacharya B Brahmachari R Crittenden S Goswami P Ghoshal M Lindner H S Mani S Mitra S Pascoli S Panda R Rangarajan S Ray T Roy Choudhury R Saha S Sarkar A Srivastava R Sheth S Uma Sankar U Yajnik
The working group on astroparticle and neutrino physics at WHEPP-9 covered a wide range of topics. The main topics were neutrino physics at INO, neutrino astronomy and recent constraints on dark energy coming from cosmological observations of large scale structure and CMB anisotropy.
Volume 95 All articles Published: 30 March 2021 Article ID 0052 Research Article
Mixed convection MHD nanofluid flow over a wedge with temperature-dependent heat source
The present work investigates the transfer of heat, mass and fluid flow at the boundary layer of a nanofluid past a wedge in the presence of a variable magnetic field, temperature-dependent heat source and chemical reaction. The study is entirely theoretical and the proposed model describes the influence of Brownian motion and thermophoresis in the case of nanofluids. This study also includes the impact of thermal radiation. The partial differential equations relating to the flow are nonlinear and hence are numerically solved after transforming them into ordinary differential equations with similar variables. The outcome of the present study is given in tabular form and depicted graphically. It is found that the nanofluid flow along the wedge is accelerated by enhancing the Falkner–Skan parameter. The study further reveals that the magnetic field has an improved effect on the velocity. The Brownian motion parameter raises the profile of temperature but decreases the profile of volume fractions. Thermal radiation decreases the energy transport rate to the fluid and hence reduces the degree of heat present in the fluid. It is also observed that heat sink blankets the surface with a layer of cold fluid.
Volume 96 All articles Published: 15 September 2022 Article ID 0178 Research Article
Exact solution for MHD elastico-viscous flow in porous medium with radiative heat transfer
S BAAG S R MISHRA G C DASH M R ACHARYA S PANDA
This work focusses on deriving exact analytic solutions for an oscillatory flow of an elastico-viscous conducting fluid in a porous medium over a moving plate with variable suction.
The momentum equation is enhanced with the resisting force offered by the permeability of the medium by incorporating the Darcy model. The energy transfer is equipped with volumetric
heat generation/absorption and thermal radiation. Exact solutions for the governing equations are obtained by employing Cardan’s method, and comparative discussion is made by using
the perturbation technique. The temperature distribution is evaluated by solving the energy equation considering relaxation time. Solutions of velocity fields are obtained for any value of
viscoelastic parameter
Volume 97, 2023
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