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71.
M. Pineda R. Toral E. Hernández-García 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2011,62(1):109-117
We study the effects of diffusing opinions on the Deffuant et al. model for continuous
opinion dynamics. Individuals are given the opportunity to change their opinion, with a
given probability, to a randomly selected opinion inside an interval centered around the
present opinion. We show that diffusion induces an order-disorder transition. In the
disordered state the opinion distribution tends to be uniform, while for the ordered state
a set of well defined opinion clusters are formed, although with some opinion spread
inside them. If the diffusion jumps are not large, clusters coalesce, so that weak
diffusion favors opinion consensus. A master equation for the process described above is
presented. We find that the master equation and the Monte Carlo simulations do not always
agree due to finite-size induced fluctuations. Using a linear stability analysis we can
derive approximate conditions for the transition between opinion clusters and the
disordered state. The linear stability analysis is compared with Monte Carlo simulations.
Novel interesting phenomena are analyzed. 相似文献
72.
We consider deep inelastic scattering in the 't Hooft model. Being solvable, this model allows us to directly compute the moments associated with the cross section at next-to-leading order in the 1/Q(2) expansion. We perform the same computation using the operator-product expansion. We find that all the terms match in both computations except for one in the hadronic side, which is proportional to a nonlocal operator. The basics of the result suggest that a similar phenomenon may occur in four dimensions in the large N(c) limit. 相似文献
73.
O. Alvarez-Llamoza K. Tucci M. G. Cosenza M. Pineda 《The European physical journal. Special topics》2007,143(1):245-247
The phenomena of synchronization and nontrivial collective behavior are studied
in a model of coupled chaotic maps with random global coupling. The mean field
of the system is coupled to a fraction of elements randomly chosen at any given
time. It is shown that the reinjection of the mean field to a fraction of
randomly selected elements can induce synchronization and nontrivial collective
behavior in the system. The regions where these collective states emerge on the
space of parameters of the system are calculated. 相似文献
74.
Antonio Fernandez Eufemio MorenoPineda Christopher A. Muryn Stephen Sproules Fabrizio Moro Grigore A. Timco Eric J. L. McInnes Richard E. P. Winpenny 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2015,127(37):11008-11011
Hybrid [2]rotaxanes and pseudorotaxanes are reported where the magnetic interaction between dissimilar spins is controlled to create AB and AB2 electron spin systems, allowing independent control of weakly interacting S= centers. 相似文献
75.
76.
Boomsma Trine Krogh Pineda Salvador Heide-Jrgensen Ditte Mlgrd 《Computational Management Science》2022,19(2):309-346
Computational Management Science - The increasing penetration of inflexible and fluctuating renewable energy generation is often accompanied by a sequential market setup, including a day-ahead spot... 相似文献
77.
78.
This study focuses on the derivation of a general effective diffusion coefficient to describe the two-dimensional (2D) diffusion in a narrow and smoothly asymmetric channel of varying width, in the simple diffusional motion of noninteracting pointlike particles under no external field. We present a generalization to the case of an asymmetric channel using the projection method introduced earlier by Kalinay and Percus [J. Chem. Phys. 122, 204701 (2005); and Phys. Rev. E 74, 041203 (2006)] to project the 2D diffusion equation into an effective one-dimensional generalized Fick-Jacobs equation. The expression for the diffusion coefficient given in Eq. (23) is our main result. This expression is a more general effective diffusion coefficient for narrow channels in 2D, which contains the well-known previous results as special cases, namely, those obtained by Bradley [Phys. Rev. E 80, 061142 (2009)], and more recently by Berezhkovskii and Szabo [J. Chem. Phys. 135, 074108 (2011)]. Finally, we study some specific 2D asymmetric channel configurations to test and show the broader applicability of Eq. (23). 相似文献
79.
Pineda FP Ortega-Castro J Alvarez-Idaboy JR Frau J Cabrera BM Ramírez JC Donoso J Muñoz F 《The journal of physical chemistry. A》2011,115(11):2359-2366
We study by density functional theory the hydrolysis of a chlorambucil analogue. Three SN(1) and one SN(2) mechanisms have been compared. Results show that the most likely mechanism involves the formation of an aziridinium ion via a first-order reaction subject to an energy barrier of 24.8 kcal/mol. Additionally, a kinetic study, using the thermodynamic formulation of the Transition State Theory, has been carried out. Theoretical results coincide with experimental values obtained under similar conditions of pH, temperature and chloride concentration. 相似文献
80.