Paris West University Nanterre La Défense

About: Paris West University Nanterre La Défense is a education organization based out in Paris, France. It is known for research contribution in the topics: Population & Finite element method. The organization has 895 authors who have published 1430 publications receiving 21712 citations.

Generic Advertising and Product Differentiation

Abstract: This article considers whether generic advertising lowers the differentiation among competing brands of the same good. Analytical results show that if the benefits from generic advertising from increased demand are outweighed by the costs from lower product differentiation then high-quality producers will not benefit from generic promotion. Hypotheses are tested empirically under a conditional-logit approach using retail-market sales and advertising data for the U.S. prune industry. Results from this study provide evidence that generic advertising has a slight differential effect on the perceived qualities of different brands.

A Multilab Replication of the Ego Depletion Effect.

Abstract: There is an active debate regarding whether the ego depletion effect is real. A recent preregistered experiment with the Stroop task as the depleting task and the antisaccade task as the outcome task found a medium-level effect size. In the current research, we conducted a preregistered multilab replication of that experiment. Data from 12 labs across the globe (N = 1,775) revealed a small and significant ego depletion effect, d = 0.10. After excluding participants who might have responded randomly during the outcome task, the effect size increased to d = 0.16. By adding an informative, unbiased data point to the literature, our findings contribute to clarifying the existence, size, and generality of ego depletion.

The HIV/AIDS epidemic in Cuba: description and tentative explanation of its low HIV prevalence

Abstract: Background The Cuban HIV/AIDS epidemic has the lowest prevalence rate of the Caribbean region. The objective of this paper is to give an overview of the HIV/AIDS epidemic in Cuba and to explore the reasons for this low prevalence.

Twelve sublattice ordered phase in the J 1 − J 2 model on the kagomé lattice

Abstract: Motivated by recent experiments on an $S=1∕2$ antiferromagnet on the kagom\'e lattice, we investigate the Heisenberg ${J}_{1}\ensuremath{-}{J}_{2}$ model with ferromagnetic ${J}_{1}$ and antiferromagnetic ${J}_{2}$, Classically the ground state displays N\'eel long-range order with 12 noncoplanar sublattices. The order parameter has the symmetry of a cuboctahedron, it fully breaks $SO(3)$ as well as the spin-flip symmetry, and we expect from the latter a ${\mathbb{Z}}_{2}$ symmetry breaking pattern. As might be expected from the Mermin-Wagner theorem in two dimensions, the $SO(3)$ symmetry is restored by thermal fluctuations while the ${\mathbb{Z}}_{2}$ symmetry breaking persists up to a finite temperature. A complete study of $S=1∕2$ exact spectra reveals that the classical order subsists for quantum spins in a finite range of parameters. First-order spin wave calculations give the range of existence of this phase and the renormalizations at $T=0$ of the order parameters associated to both symmetry breakings. This phase is destroyed by quantum fluctuations for a small but finite ${J}_{2}∕\ensuremath{\mid}{J}_{1}\ensuremath{\mid}\ensuremath{\simeq}3$, consistently with exact spectra studies, which indicate a gapped phase.