145 research outputs found
On the contribution of the Hall term in small-scale magnetohydrodynamic dynamo
A detailed study of small-scale Hall magnetohydrodynamic dynamo has been
performed both analytically and numerically. Assuming the magnetic field and
the current to be separate fields, the contribution of the Hall term has been
decomposed into two parts and their individual contributions have been studied
separately. Calculating the scale-separated transfer rates described in Dar
\textit{et. al.} (Physica D, 157 (207), 2001), it is found that the small-scale
current fields are the primary contributors in sustaining large scale magnetic
fields. Furthermore, the nature of the scale-to-scale fluxes are found to be
globally intact with the ion inertial scale
Melting of Quarkonia in strong magnetic field
In this paper, spectra of the quarkonium states has been studied using the conditions temperature, chemical potential and the magnetic field. Here our main focus is to study the effect of strong magnetic field on the quarkonium properties. The binding energies and the dissociation temperature for the ground and the first excited states of the charmonium and bottomonium in the presence of strong magnetic field at chemical potential μ = 500 MeV has been studied. Here we use quasiparticle(QP) Debye mass depending upon temperature, magnetic field and chemical potential obtained from the quasiparticle approach. The Debye mass strongly increases at different values of temperature and magnetic field. The binding energy decreases with increase in the temperature at different magnetic field eB=0.3, 0.5, and 0.7 GeV2 and also decreases with magnetic field at different at T=200,300 and 400 MeV for the J/ψ, Ψ’, ϒ, and ϒ’ states of the quarkonia. The dissociation temperature of the quarkonium states falls with the increasing values of the magnetic field at critical temperature Tc =197 MeV
Exploring the Influence of Yogic Asana Practice on Body Fat Percentage - A Systematic Review
Yoga is a spiritual, mental, and physical discipline-based activity practiced thousands of years ago and originated in India. Yoga is a science-rich unique holistic approach focusing on mind and body harmony. Exercise neuroscientists and physiologists long acknowledged the health benefits of physical postures, meditation and breathing exercises. However, recent research has demonstrated that breathing and meditation practices also provide active attentional benefits. Scientific evidence-based research on yoga creates interest among the research fraternity. This article highlights the current understanding of yoga asanas and their documented positive impacts on body fat percentage. The author reviewed more than 13 studies and articles about the effects of yogic asanas practice on body fat percentage. All the studies reveal the positive impact of yogic asanas (physical posture) on the different elements of body composition. The studies offer promising evidence that yogic asanas practice may hold promise to mitigate body fat percentage along with other body composition elements
Genome-Wide Mapping of Quantitative Trait Loci for Yield-Attributing Traits of Peanut
Peanuts (Arachis hypogaea L.) are important high-protein and oil-containing legume crops adapted to arid to semi-arid regions. The yield and quality of peanuts are complex quantitative traits that show high environmental influence. In this study, a recombinant inbred line population (RIL) (Valencia-C × JUG-03) was developed and phenotyped for nine traits under two environments. A genetic map was constructed using 1323 SNP markers spanning a map distance of 2003.13 cM. Quantitative trait loci (QTL) analysis using this genetic map and phenotyping data identified seventeen QTLs for nine traits. Intriguingly, a total of four QTLs, two each for 100-seed weight (HSW) and shelling percentage (SP), showed major and consistent effects, explaining 10.98% to 14.65% phenotypic variation. The major QTLs for HSW and SP harbored genes associated with seed and pod development such as the seed maturation protein-encoding gene, serine-threonine phosphatase gene, TIR-NBS-LRR gene, protein kinase superfamily gene, bHLH transcription factor-encoding gene, isopentyl transferase gene, ethylene-responsive transcription factor-encoding gene and cytochrome P450 superfamily gene. Additionally, the identification of 76 major epistatic QTLs, with PVE ranging from 11.63% to 72.61%, highlighted their significant role in determining the yield- and quality-related traits. The significant G × E interaction revealed the existence of the major role of the environment in determining the phenotype of yield-attributing traits. Notably, the seed maturation protein-coding gene in the vicinity of major QTLs for HSW can be further investigated to develop a diagnostic marker for HSW in peanut breeding. This study provides understanding of the genetic factor governing peanut traits and valuable insights for future breeding efforts aimed at improving yield and quality
Magnetic moments of the low-lying , resonances within the framework of the chiral quark model
The magnetic moments of the low-lying spin-parity ,
resonances, like, for example, ,
, as well as their transition magnetic moments, are
calculated using the chiral quark model. The results found are compared with
those obtained from the nonrelativistic quark model and those of unitary chiral
theories, where some of these states are generated through the dynamics of two
hadron coupled channels and their unitarization
Statistical features of rapidly rotating decaying turbulence: Enstrophy and energy spectra and coherent structures
In this paper we investigate the properties of rapidly rotating decaying
turbulence using numerical simulations and phenomenological modelling. We find
that as the turbulent flow evolves in time, the Rossby number decreases to
, and the flow becomes quasi-two-dimensional with strong coherent
columnar structures arising due to the inverse cascade of energy. We establish
that a major fraction of energy is confined in Fourier modes and
that correspond to the largest columnar structure in the flow. For
wavenumbers () greater than the enstrophy dissipation wavenumber (),
our phenomenological arguments and numerical study show that the enstrophy flux
and spectrum of a horizontal cross-section perpendicular to the axis of
rotation are given by and
respectively; for this 2D flow,
is the enstrophy dissipation rate, and is a constant.
Using these results, we propose a new form for the energy spectrum of rapidly
rotating decaying turbulence:
. This model of the energy
spectrum is based on wavenumber-dependent enstrophy flux, and it deviates
significantly from power law energy spectrum reported earlier
Nuclear Ground State Observables and QCD Scaling in a Refined Relativistic Point Coupling Model
We present results obtained in the calculation of nuclear ground state
properties in relativistic Hartree approximation using a Lagrangian whose
QCD-scaled coupling constants are all natural (dimensionless and of order 1).
Our model consists of four-, six-, and eight-fermion point couplings (contact
interactions) together with derivative terms representing, respectively, two-,
three-, and four-body forces and the finite ranges of the corresponding mesonic
interactions. The coupling constants have been determined in a self-consistent
procedure that solves the model equations for representative nuclei
simultaneously in a generalized nonlinear least-squares adjustment algorithm.
The extracted coupling constants allow us to predict ground state properties of
a much larger set of even-even nuclei to good accuracy. The fact that the
extracted coupling constants are all natural leads to the conclusion that QCD
scaling and chiral symmetry apply to finite nuclei.Comment: 44 pages, 13 figures, 9 tables, REVTEX, accepted for publication in
Phys. Rev.
Chiral Quark Model with Configuration Mixing
The implications of one gluon exchange generated configuration mixing in the
Chiral Quark Model (QM) with SU(3) and axial U(1) symmetry
breakings are discussed in the context of proton flavor and spin structure as
well as the hyperon -decay parameters. We find that QM
with SU(3) symmetry breaking is able to give a satisfactory unified fit for
spin and quark distribution functions, with the symmetry breaking parameters
, and the mixing angle , both for NMC and the
most recent E866 data. In particular, the agreement with data, in the case of
, F, D, and , is quite striking.Comment: 16 pages, LaTex, Table and Appendix adde
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