Dynamical model for spin-crossover solids. I. Relaxation effects in the mean-field approach

2000 ◽  
Vol 62 (22) ◽  
pp. 14796-14805 ◽  
Author(s):  
Kamel Boukheddaden ◽  
Isidor Shteto ◽  
Benoit Hôo ◽  
François Varret
Keyword(s):  
Spin Crossover ◽  
Mean Field ◽  
Dynamical Model ◽  
Field Approach ◽  
Relaxation Effects ◽  
The Mean

Dynamical model for spin-crossover solids. II. Static and dynamic effects of light in the mean-field approach

2000 ◽  
Vol 62 (22) ◽  
pp. 14806-14817 ◽  
Author(s):  
Kamel Boukheddaden ◽  
Isidor Shteto ◽  
Benoit Hôo ◽  
François Varret
Keyword(s):  
Spin Crossover ◽  
Mean Field ◽  
Dynamical Model ◽  
Dynamic Effects ◽  
Field Approach ◽  
The Mean

NUCLEAR MATTER WITH CONSTITUENT MESON QUANTA

1990 ◽  
Vol 05 (17) ◽  
pp. 3391-3399 ◽  
Author(s):  
AMRUTA MISHRA ◽  
H. MISHRA ◽  
S.P. MISRA
Keyword(s):  
Field Theory ◽  
Nuclear Matter ◽  
Mass Shell ◽  
Mean Field ◽  
S Wave ◽  
Field Approach ◽  
Physical Insight ◽  
The Mean

We discuss here some nonperturbative techniques of field theory, where we dress nuclear matter as a whole with off-mass-shell pions. Here s-wave pion pairs simulate the effect of σ-meson of the mean field approach of Walecka. The signatures are in agreement with earlier results along with new physical insight.

Queueing networks with mobile servers: The mean-field approach

2016 ◽  
Vol 52 (2) ◽  
pp. 178-199 ◽  
Author(s):  
F. Baccelli ◽  
A. N. Rybko ◽  
S. B. Shlosman
Keyword(s):  
Queueing Networks ◽  
Mean Field ◽  
Field Approach ◽  
The Mean

scholarly journals Paradox of integration — mean field approach

2017 ◽  
Vol 28 (11) ◽  
pp. 1750133 ◽  
Author(s):  
Krzysztof Kułakowski ◽  
Piotr Gronek ◽  
Alfio Borzì
Keyword(s):  
Social Status ◽  
Positive Emotions ◽  
Mean Field ◽  
Computational Approach ◽  
Transient Time ◽  
Field Approach ◽  
The Social ◽  
The Mean ◽  
High Social Status

Recently, a computational model has been proposed of the social integration, as described in sociological terms by Blau. In this model, actors praise or critique each other, and these actions influence their social status and raise negative or positive emotions. The role of a self-deprecating strategy of actors with high social status has also been discussed there. Here, we develop a mean field approach, where the active and passive roles (praising and being praised, etc.) are decoupled. The phase transition from friendly to hostile emotions has been reproduced, similarly to the previously applied purely computational approach. For both phases, we investigate the time dependence of the distribution of social status. There we observe a diffusive spread, which — after some transient time — appears to be limited from below or from above, depending on the phase. As a consequence, the mean status flows.

PHENOMENOLOGICAL THEORY OF HIGH Tc SUPERCONDUCTORS

1987 ◽  
Vol 01 (03n04) ◽  
pp. 997-1000 ◽  
Author(s):  
M.P. Das ◽  
A.G. Saif
Keyword(s):  
Electrical Conductivity ◽  
Mean Field ◽  
Phenomenological Theory ◽  
Phenomenological Approach ◽  
Order Parameters ◽  
High Tc Superconductors ◽  
High Tc ◽  
Field Approach ◽  
Superconducting Ceramics ◽  
The Mean

We present a phenomenological approach in terms of two coexisting macroscopic order parameters correponding to the superconducting and the insulating states relevant to the high. temperature superconducting ceramics. On using the mean field approach we discuss the electrodynamical responses and from the fluctuations of the order parameters we obtain results for the electrical conductivity, which is shown to possess anomalies as in the granular materials.

On: “Stratigraphic filter theory: Combined effects of parallel bedding and random inhomogeneities” by I. Lerche (GEOPHYSICS, 51, 1531–1537, August 1986).

Geophysics ◽  
1988 ◽  
Vol 53 (7) ◽  
pp. 995-997 ◽  
Author(s):  
Ru‐Shan Wu
Keyword(s):  
Incident Wave ◽  
Random Media ◽  
Seismic Waves ◽  
Mean Field ◽  
Field Approach ◽  
Scattering Attenuation ◽  
Amplitude Attenuation ◽  
Validity Condition ◽  
The Mean ◽  
Field Formalism

In the paper by Lerche (hereafter referred to as Lerche 86), the author compared his formula of effective attenuation (42) based on the mean field attenuation with formula (41), attributed to Wu (1982a), and claimed that Wu’s formula “explicitly assumed that the Born approximation is valid (i.e., that the scattering by the randomly sited centers is from the unperturbed incident wave with no modification to the wave from previous scattering),” while in his result “the modification to the incident wave is taken into account through the statistically sharp mean field” and therefore is “more correct.” However, neither the statement about the validity condition of Wu’s formula not the author’s formula (42) from the mean field approach is correct. In fact, the mean field formalism, when improperly applied to amplitude attenuation, can generate physically meaningless results. The impotence and fallacy of the mean field formalism in dealing with amplitude attenuation in 3-D random media have been recognized since the early 1980s (Wu, 1980, 1982a, b; Sato, 1982a, b). This recognition and the developments thereafter can be considered as one of the major advances in the field of scattering attenuation of seismic waves (Herraiz and Espinosa, 1987; Wu, 1987). Retreat from this advance seems injudicious and illogical. Therefore, I would like to take this opportunity to clarify some basic problems of scattering attenuation.

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