Search results for "Condition"
showing 10 items of 2530 documents
Vectors of Pairwise Item Preferences
2019
Neural embedding has been widely applied as an effective category of vectorization methods in real-world recommender systems. However, its exploration of users’ explicit feedback on items, to create good quality user and item vectors is still limited. Existing neural embedding methods only consider the items that are accessed by the users, but neglect the scenario when a user gives high or low rating to a particular item. In this paper, we propose Pref2Vec, a method to generate vector representations of pairwise item preferences, users and items, which can be directly utilized for machine learning tasks. Specifically, Pref2Vec considers users’ pairwise item preferences as elementary units. …
Pheromone-induced odour learning in newborn rabbits: action, development and adaptive function
2012
Communication orale; International audience
Graphene nanoribbons subject to gentle bends
2012
Since graphene nanoribbons are thin and flimsy, they need support. Support gives firm ground for applications, and adhesion holds ribbons flat, although not necessarily straight: ribbons with high aspect ratio are prone to bend. The effects of bending on ribbons' electronic properties, however, are unknown. Therefore, this article examines the electromechanics of planar and gently bent graphene nanoribbons. Simulations with density-functional tight-binding and revised periodic boundary conditions show that gentle bends in armchair ribbons can cause significant widening or narrowing of energy gaps. Moreover, in zigzag ribbons sizeable energy gaps can be opened due to axial symmetry breaking,…
Orthorhombic Phase of Crystalline Polyethylene: A Monte Carlo Study
1996
In this paper we present a classical Monte Carlo simulation of the orthorhombic phase of crystalline polyethylene, using an explicit atom force field with unconstrained bond lengths and angles and periodic boundary conditions. We used a recently developed algorithm which apart from standard Metropolis local moves employs also global moves consisting of displacements of the center of mass of the whole chains in all three spatial directions as well as rotations of the chains around an axis parallel to the crystallographic c-direction. Our simulations are performed in the NpT ensemble, at zero pressure, and extend over the whole range of temperatures in which the orthorhombic phase is experime…
Dilute solution rheology of flexible macromolecules (bead–rod model)
1974
The rheological behavior of dilute solutions of flexible macromolecules is studied by means of a freely jointed multiple bead–rod model. The solution of the equations describing the mechanics of the system is obtained by means of a numerical procedure, which applies to arbitrary flow conditions. The case of the transient stress in uniaxial elongational flow is developed in some detail. A comparison with bead–spring models shows both quantitative and qualitative differences which are briefly discussed.
Heterogeneous nucleation at a wall near a wetting transition: a Monte Carlo test of the classical theory
2009
While for a slightly supersaturated vapor the free energy barrier ΔF(hom)(*), which needs to be overcome in a homogeneous nucleation event, may be extremely large, nucleation is typically much easier at the walls of the container in which the vapor is located. While no nucleation barrier exists if the walls are wet, for incomplete wetting of the walls, described via a nonzero contact angle Θ, classical theory predicts that nucleation happens through sphere-cap-shaped droplets attracted to the wall, and their formation energy is ΔF(het)(*) = ΔF(hom)(*)f(Θ), with f(Θ) = (1-cosΘ)(2)(2+cosΘ)/4. This prediction is tested through simulations for the simple cubic lattice gas model with nearest-nei…
La precariedad laboral en inmigrantes en situación irregular en España y su relación con la salud
2009
ResumenObjetivoDescribir las características de la precariedad laboral en inmigrantes irregulares en España y su relación con la salud.MétodosEstudio cualitativo que utiliza los principios de la inducción analítica. Se definió una submuestra del proyecto ITSAL, cuya muestra teórica se identificó a partir de la definición de inmigrante en España y de la literatura. Las áreas de estudio fueron 4 ciudades de España. La muestra final fue de 44 trabajadores inmigrantes irregulares, de 4 nacionalidades.ResultadosAlgunas características de la precariedad laboral percibidas por los inmigrantes irregulares fueron: elevada inestabilidad laboral; ausencia total de empoderamiento en tanto no cuentan co…
Essential elements of professional nursing environments in Primary Care and their influence on the quality of care
2018
Objectives Nursing work environments (NWE) are key determinants of care quality. Our study aimed to evaluate the characteristics of nursing environments in primary care settings in the Canary Islands, and identify crucial components of such environments to improve quality. Method We conducted a cross-sectional study in primary care organisations using the Practice Environment Scale - Nursing Work Index (PES-NWI) tool. We collected sociodemographic variables, PES-NWI scores, and selected the essential items conducive to optimal care. Appropriate parametric and non-parametric statistical tests were used to analyse relations between variables (CI = 95%, error = 5%). Results 144 nurses particip…
Quand les enseignants claquent la porte
2021
International audience; Les démissions de professeurs des écoles, bien que statistiquement limitées, sont un révélateur de la dégradation des conditions de travail des enseignants dans un contexte d’austérité budgétaire, sans que cette question se limite au thème de la revalorisation des salaires.
Mixité, carrières et performances
2005
Dans le cadre du projet "Managers Plurielles", soutenu par le Fonds social européen, l'Iredu centre régional associé au Céreq a réalisé une recherche sur l'égalité des chances au sein des unités hôtelières Etap Hôtel et Formule 1. Les atouts et obstacles se conjuguent-ils de la même façon au masculin et au féminin ? Quelles sont les mesures à mettre en place pour faciliter la vie des personnels de l'hôtellerie et optimiser leurs carrières ? A travers une mosaïque de témoignages, soixante-dix-sept entretiens individuels, il s'agit d'apprécier les opportunités d'évolution et les possiblités de management et, de proposer des pistes d'action sur lesquelles l'entreprise peut agir.