Small radii of neutron stars as an indication of novel in-medium effects

At present, neutron star radii from both observations and model predictions remain very uncertain. Whereas different models can predict a wide range of neutron star radii, it is not possible for most models to predict radii that are smaller than about 10 km, thus if such small radii are established in the future they will be very difficult to reconcile with model estimates. By invoking a new term in the equation of state that enhances the energy density, but leaves the pressure unchanged we simulate the current uncertainty in the neutron star radii. This new term can be possibly due to the exchange of the weakly interacting light U-boson with appropriate in-medium parameters, which does not compromise the success of the conventional nuclear models. The validity of this new scheme will be tested eventually by more precise measurements of neutron star radii.Comment: EPJA (2015) in pres

Neutron-skin thickness of finite nuclei in relativistic mean-field models with chiral limits

We study several structure properties of finite nuclei using relativistic mean-field Lagrangians constructed according to the Brown-Rho scaling due to the chiral symmetry restoration at high densities. The models are consistent with current experimental constraints for the equations of state of symmetric matter at both normal and supra-normal densities and of asymmetric matter at sub-saturation densities. It is shown that these models can successfully describe the binding energies and charge radii of finite nuclei. Compared to calculations with usual relativistic mean-field models, these models give a reduced thickness of neutron skin in ^{208}Pb between 0.17 fm and 0.21 fm. The reduction of the predicted neutron skin thickness is found to be due to not only the softening of the symmetry energy but also the scaling property of $\rho$ meson required by the partial restoration of chiral symmetry.Comment: Accepted version to appear in PRC (2007

Large-mass neutron stars with hyperonization

Within a density-dependent relativistic mean-field model using in-medium meson-hadron coupling constants and meson masses, we explore effects of in-medium hyperon interactions on properties of neutron stars. It is found that the hyperonic constituents in large-mass neutron stars can not be simply ruled out, while the recently measured mass of the millisecond pulsar J1614-2230 can constrain significantly the in-medium hyperon interactions. Moreover, effects of nuclear symmetry energy on hyperonization in neutron stars are also discussed

Effects of medium-induced ρ−ω\rho-\omega meson mixing on the equation of state in isospin-asymmetric nuclear matter

We reexamine effects of the $\rho-\omega$ meson mixing mediated by nucleon polarizations on the symmetry energy in isospin-asymmetric nuclear matter. Taking into account the rearrangement term neglected in previous studies by others, we evaluate the $\rho-\omega$ mixing angle in a novel way within the Relativistic Mean-Field Models with and without chiral limits. It is found that the symmetry energy is significantly softened at high densities contrary to the finding in earlier studies. As the first step of going beyond the lowest-order calculations, we also solve the RPA equation for the $\rho-\omega$ mixing. In this case, it is found that the symmetry energy is not only significantly softened by the $\rho-\omega$ mixing at supra-saturation densities, similar to the lowest-order $\rho-\omega$ mixing, but interestingly also softened at subsaturation densities. In addition, the softening of the symmetry energy at subsaturation densities can be partly suppressed by the nonlinear self-interaction of the $\sigma$ meson.Comment: Significant changes made. Accepted version to appear in PRC (2009

Study on Distribution Strategy of Multinational Corporations Localization Management

Localization management has become a wise choice for the multinational corporations to win in the host country market. Since long ago, many multinational corporations had neglected the importance of distribution in the localization that caused the localization strategy defeat. Base on analyses the connotation of localization management, the paper summarizes some problems exit in distribution in the multinational corporations localization management such as insufficiency analysis of the host country market, the cultural conflict existence, the channel structure is unaccustomed to the climate and so on, then some corresponding solution countermeasures are proposed. Key words: Distribution, Localization Management, Multinational Corporations Résumé: la gestion de la décentralisation est devenue un choix pertinent pour les société multinationales à gagner dans le marché du pays hôte. Depuis longtemps, beaucoup de sociétés multinationales avaient négligé l’importance de la distribution dans la décentralisation qui a causé la défaite de la stratégie de décentralisation. Basée sur les analyses de la connotation de la gestion de décentralisation, cette mémoire résume des problèmes existant en distribution dans la gestion de la décentralisation des sociétés multinationales tels que l’insuffisamment de l’analyse du marché du pays hôte, l’existence du conflit cultural, la structure du canal n’a pas été habituée au climat etc. Donc, les contre-mesures de solutions correspondantes sont proposées. Mots-Clés: distribution gestion de la décentralisation, sociétés multinationale

STUDY ON DISTRIBUTION STRATEGY OF MULTINATIONAL CORPORATIONS LOCALIZATION MANAGEMENT

Localization management has become a wise choice for the multinational corporations to win in the host country market. Since long ago, many multinational corporations had neglected the importance of distribution in the localization that caused the localization strategy defeat. Base on analyses the connotation of localization management, the paper summarizes some problems exit in distribution in the multinational corporations localization management such as insufficiency analysis of the host country market, the cultural conflict existence, the channel structure is unaccustomed to the climate and so on, then some corresponding solution countermeasures are proposed. Key words: Distribution, Localization Management, Multinational Corporation