Modeling of the magnetic free energy of self-diffusion in bcc Fe

2015 ◽  
Vol 92 (18) ◽  
Author(s):  
N. Sandberg ◽  
Z. Chang ◽  
L. Messina ◽  
P. Olsson ◽  
P. Korzhavyi
Keyword(s):  
Free Energy ◽  
Magnetic Free Energy ◽  
Self Diffusion

scholarly journals Interacting Magnetospheres in RS CVn Binaries – Coronal Heating and Flares

1983 ◽  
Vol 71 ◽  
pp. 629-632
Author(s):  
Y. Uchida ◽  
T. Sakurai
Keyword(s):  
Free Energy ◽  
Magnetic Fields ◽  
Binary Systems ◽  
Coronal Heating ◽  
Close Binary ◽  
Magnetic Free Energy ◽  
Close Binary Systems

AbstractCoronae and flares of RS CVn systems are interpreted as due to gradual and sudden releases of magnetic free energy which is built up throught the interaction of magnetic fields of stars in these close binary systems.

scholarly journals Flux emergence, flux imbalance, magnetic free energy and solar flares

2013 ◽  
Vol 52 (8) ◽  
pp. 1561-1566 ◽  
Author(s):  
Debi Prasad Choudhary ◽  
Sanjay Gosain ◽  
Nat Gopalswamy ◽  
P.K. Manoharan ◽  
R. Chandra ◽  
...  
Keyword(s):  
Free Energy ◽  
Solar Flares ◽  
Flux Emergence ◽  
Magnetic Free Energy

scholarly journals A Molecular Dynamics Approach to Calculate the Thermodiffusion (Soret and Seebeck) Coefficients of Salts in Aqueous Solutions

2021 ◽  
Author(s):  
Leandro Rezende Franco ◽  
André Luiz Sehnem ◽  
Antônio Martins Figueiredo Neto ◽  
Kaline Coutinho
Keyword(s):  
Molecular Dynamics ◽  
Free Energy ◽  
Aqueous Solutions ◽  
Optical Measurements ◽  
Soret Coefficient ◽  
System Response ◽  
Physical Parameters ◽  
Hydration Free Energy ◽  
Self Diffusion ◽  
Seebeck Coefficients

<div><div><div><p>An approach to investigate the physical parameters related to the ions thermodiffusion in aqueous solution is proposed herein by calculating the equilibrium hydration free energy and the self-diffusion coefficient as a function of temperature, ranging from 293 to 353 K, using molecular dynamics simulations of infinitely diluted ions in aqueous solutions. Several ion force field parameters are used in the simulations and new parameters are proposed for some ions to better describe their hydration free energy. Such a theoretical framework enables the calculation of some single-ion properties, such as heat of transport, Soret coefficient and mass current density, as well as properties of salts, such as effective mass and thermal diffusion, Soret and Seebeck coefficients. These calculated properties are compared with experimental data available from optical measurements and showed good agreement revealing an excellent theoretical predictability of salt thermodiffusion properties. Differences in single-ion Soret and self-diffusion coefficients of anions and cations give rise to a thermoelectric field, which affects the system response that is quantified by the Seebeck coefficient. The fast and slow Seebeck coefficients are calculated and discussed, resulting in values with mV/K order-of-magnitude, as observed in experiments involving several salts, such as K+Cl−, Na+Cl−, H+Cl−, Na+OH−, TMA+OH− and TBA+OH−. The present approach can be adopted for any ion or charged particle dispersed in water with the aim of predicting the thermoelectric field induced through the fluid. It has potential applications in designing electrolytes for ionic thermoelectric devices in order to harvest energy and thermoelectricity in biological nanofluids.</p></div></div></div>

Relation between the magnetic free energy and relative magnetic helicity in the MHD extreme state of solar corona

2020 ◽  
Author(s):  
Shangbin Yang ◽  
Joerg Buechner ◽  
Hongqi Zhang
Keyword(s):  
Magnetic Field ◽  
Free Energy ◽  
Solar Activity ◽  
Solar Corona ◽  
Solar Flares ◽  
Magnetic Helicity ◽  
Magnetic Free Energy ◽  
Helicity Conservation ◽  
Field Lines ◽  
Extreme State

&lt;p&gt;Magnetic helicity is a quantity describing the twist, writhe, and torsion of magnetic field lines and magnetic configurations . The concept of magnetic helicity has successfully been applied to characterize solar coronal processes. A conjecture about one approximation relation between free magnetic free energy and relative magnetic helicity in the MHD extreme state of solar corona has been proposed by using the concept of magnetic helicity conservation and Lie-Poisson mechanical structure of MHD. We use constant &amp;#945; force-free filed extrapolation to check out this relation. We also apply this relation to analyze the results from the simulations and observations. Such relation may be helpful to predict the solar activity like the solar flares and CMEs&lt;/p&gt;

Electric and magnetic free energy in nonlinear media. Quasi-static fields

1965 ◽  
Vol 40 (1) ◽  
pp. 168-177
Author(s):  
F. Barocchi ◽  
M. Mancini ◽  
G. Toraldo di Francia
Keyword(s):  
Free Energy ◽  
Nonlinear Media ◽  
Magnetic Free Energy
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