Results 31 to 40 of about 18,545 (191)

On storm weakening during substorm expansion phase [PDF]

Annales Geophysicae, 1997
Iyemori and Rao recently presented evidence that the strength of a magnetic storm, as measured by -Dst, weakens, or its rate of growth slows, during the substorm expansion phase.
G. L. Siscoe, H. E. Petschek
doaj   +1 more source

Partitioning Entropy with Action Mechanics: Predicting Chemical Reaction Rates and Gaseous Equilibria of Reactions of Hydrogen from Molecular Properties

Entropy, 2021
Our intention is to provide easy methods for estimating entropy and chemical potentials for gas phase reactions. Clausius’ virial theorem set a basis for relating kinetic energy in a body of independent material particles to its potential energy ...
Ivan R. Kennedy, Migdat Hodzic
doaj   +1 more source

Can Structure Formation Influence the Cosmological Evolution? [PDF]

, 2001
The backreaction of structure formation influences the cosmological evolution equation for the homogenous and isotropic average metric. In a cold dark matter universe this effect leads only to small corrections unless a substantial fraction of matter is ...
A. Albrecht, A. Hebecker, A.G. Riess, B. Ratra, C. Amendariz-Picon, C. Wetterich, C. Wetterich, C. Wetterich, C. Wetterich, C. Wetterich, C. Wetterich, Christof Wetterich, E. Copeland, N. Tsamis, N. Tsamis, P. Steinhardt, P.G. Ferreira, P.J. Peebles, R. Abramo, R. Caldwell, S. Perlmutter, T. Buchert, T. Futamase, T. Futamase, T. Futamase, V. Sahni   +25 more
core   +2 more sources

Virial Theorem for Nonrelativistic Quantum Fields in D Spatial Dimensions

Advances in High Energy Physics, 2015
The virial theorem for nonrelativistic complex fields in D spatial dimensions and with arbitrary many-body potential is derived, using path-integral methods and scaling arguments recently developed to analyze quantum anomalies in low-dimensional systems.
Chris L. Lin, Carlos R. Ordóñez
doaj   +1 more source

Cosmological consequences hydrodynamic vortex: vortex and dark energy in the space

Vìsnik Dnìpropetrovsʹkogo Unìversitetu: Serìâ Modelûvannâ, 2016
On the basis of synthesis of several exact solutions of the hydrodynamic Euler's equations for cylindrical and spherical vortex currents it is established that not spiral currents integral of energy contain the additional member with physical sense of ...
V. I. Perehrest
doaj   +1 more source

Energy-momentum tensor in QCD: nucleon mass decomposition and mechanical equilibrium

Journal of High Energy Physics, 2021
We review and examine in detail recent developments regarding the question of the nucleon mass decomposition. We discuss in particular the virial theorem in quantum field theory and its implications for the nucleon mass decomposition and mechanical ...
Cédric Lorcé, Andreas Metz, Barbara Pasquini, Simone Rodini   +3 more
doaj   +1 more source

On Cluster Rotation in the Galactic Tidal Field

Open Astronomy, 2014
The dynamics of a rotating star cluster moving along a circular orbit in the axisymmetrical steady Galaxy is considered. The generalized tensor virial theorem allows to estimate its rotation speed.
Ossipkov Leonid P.
doaj   +1 more source

Towards B-Spline Atomic Structure Calculations

Atoms, 2021
The paper reviews the history of B-spline methods for atomic structure calculations for bound states. It highlights various aspects of the variational method, particularly with regard to the orthogonality requirements, the iterative self-consistent ...
Charlotte Froese Fischer
doaj   +1 more source

Virial Extension for Discrete Data Series

Signals
The Virial theorem has been applied with considerable success in various fields of natural sciences. This work proposes an extension of the theorem applied to discrete data series.
Dino Otero, Ariel Amadio, Leandro Robles Dávila, Marcos Maillot, Cristian Bonini, Walter Legnani   +5 more
doaj   +1 more source

Virial theorem for a cloud of stars obtained from the Jeans equations with second correlation moments

European Physical Journal C: Particles and Fields, 2023
A hydrodynamic model for small acoustic oscillations in a cloud of stars is built, taking into account the self-consistent gravitational field in equilibrium with a non-zero second correlation moment.
A. A. Stupka, E. M. Kopteva, M. A. Saliuk, I. M. Bormotova   +3 more
doaj   +1 more source