Search results for "Partition"
showing 10 items of 411 documents
L'action publique face aux inégalités sociales en France
2013
National audience; L'article présente quelques repères de base concernant l'état des inégalités sociales en France aujourd'hui et leur évolution sur les trente dernières années. Il rappelle les moyens que l'État utilise pour construire sa politique sociale et combattre les différents types d'inégalités sociales qui existent dans la société. L'auteur traite aussi de la répartition des compétences en matière d'action sociale entre différents niveaux d'administration en France et mentionne quelques initiatives récentes dans le domaine du pilotage de cette politique publique.
Environmentally Relevant Properties of All 209 Polychlorinated Biphenyl Congeners for Modeling Their Fate in Different Natural and Climatic Conditions
2009
The temperature dependence of physical properties and degradation lifetimes in the environment of all polychlorinated biphenyl (PCB) congeners (N = 209) were determined. For physical properties, the coefficients A and B in equations log(property) = A(property) − B(property)/T(K) were determined by thermodynamic and QSPR methods and compared with the results of independent methods in the literature. The coefficients Apl and Bpl for liquid state vapor pressure PL, As and Bs for solubility in water SW, Ah and Bh for volatility kH (or kH = PL/SW), and Aow and Bow for lipophilicity (KOW), stored in the database of the fate model program, allowed automatic temperature corrections for realistic fa…
Estimation of vapor pressures, solubilities and Henry's law constants of selected persistent organic pollutants as functions of temperature
1999
Abstract An internally consistent set of temperature dependent physical-chemical property data was derived for 73 persistent organic pollutants, including polychlorinated biphenyls, diphenylethers, dibenzo-p-dioxins, and dibenzofurans, organochlorinated pesticides and polycyclic aromatic hydrocarbons. Measured data reported in the literature were expanded by different estimation and regression methods. Temperature dependent vapor pressures were estimated from relative gas chromatographic retention times and by a modified Watson equation. Temperature dependent water solubilities were estimated by equations based on mobile order theory modified from Ruelle and Kesselring. The temperature depe…
Proposed alternative phase ratio variation method for the calculation of liquid–vapour partition coefficients of volatiles
2012
International audience; The phase ratio variation PRV method is a classical way to determine the partition coefficients of volatile compounds between their solution and vapour phases in a variety of circumstances. However, some results obtained by this method can be disappointing. A new PRV equation in which the initial liquid-phase solute concentration is replaced by the liquid-phase solute concentration at equilibrium is proposed. This proposed PRV equation is a second-order polynomial equation. To thoroughly examine the possible modes of calculation, noisy dummy data were generated using both the classical, first-order PRV model (PRV1) and the proposed, second-order model (PRV2). Thus, p…
Reduction of the interfacial tension between ‘immiscible’ polymers: to which phase one should add a compatibilizer
2001
Abstract The reduction of interfacial tension σ between polyethylene oxide (PEO) and polypropylene oxide (PPO) by either a triblock copolymer EO–PO–EO or a diblock copolymer styrene–EO was studied by means of the pendant drop method from 70 to 120°C. Time independent data correspond to stationary states and do not represent equilibrium information. The addition of the compatibilizer to the PPO phase is approximately twice as efficient as the addition to the PEO phase for both block copolymers. Knowing the concentration dependence of σ for one of the coexisting phases it is possible to forecast the effects resulting from the addition of the other phase by means of model considerations based …
(Liquid + liquid) equilibria of polymer-salt aqueous two-phase systems for laccase partitioning : UCON 50-HB-5100 with potassium citrate and (sodium …
2012
Aqueous two-phase systems (ATPS) are recognized as very suitable techniques for the recovery of target solutes in biological applications. Three new phase diagrams of (UCON 50-HB-5100 + potassium citrate + water), (UCON 50-HB-5100 + sodium formate + water), and (UCON 50-HB-5100 + potassium formate + water) systems were measured at 23 C. The binodal curves were successfully described using the empirical equation suggested by Merchuk and co-workers. The reliability of the tie-line data experimentally determined was evaluated using the equations reported by Othmer–Tobias and Bancroft and satisfactory linearity was obtained for all ATPS. Among the salts studied, potassium citrate proved to be t…
Politiques éducatives et conditions de l'objectif "80 pour cent d'une classe d'âge au niveau IV"
1993
International audience; L'objectif de conduire 80 pour cent d'une classe d'âge au niveau baccalauréat a été défini en 1985. Un certain nombre de mesures pédagogiques prises dès le début des années 60 ont permis l'expression de cet objectif en créant les conditions favorables de son développement. Cet article vise à reconstituer la complémentarité des mesures qui ont touché le collège, le lycée et la gestion de l'orientation pendant les trente années qui séparent le décret du 6 janvier 1959 portant la scolarité obligatoire jusqu'à 16 ans de la loi d'orientation sur l'éducation du 10 juillet 1989 donnant pour mission au système éducatif de qualifier tous les jeunes et d'en former 80 pour cent…
A Constructive Arboricity Approximation Scheme
2020
The arboricity \(\varGamma \) of a graph is the minimum number of forests its edge set can be partitioned into. Previous approximation schemes were nonconstructive, i.e., they approximate the arboricity as a value without computing a corresponding forest partition. This is because they operate on pseudoforest partitions or the dual problem of finding dense subgraphs.
Professional competencies in health promotion and public health: what is common and what is specific? Review of the European debate and perspectives …
2015
According to the Nairobi Call to Action, the growth of practitioners' skills can be favoured by setting accreditation standards and by reorienting professional competencies of current and future health workers. This will make it possible to develop a critical mass of competent practitioners, foster training, and increase visibility of the professional field. Through a review of the literature, the authors offer an overview of competency-based strategies for professional development in health promotion. The main research questions discussed were as follows: Is there a shared definition of public health?; Is there a shared definition of health promotion?; Who are the main stakeholders for pub…
Logarithmic Vector Fields and the Severi Strata in the Discriminant
2017
The discriminant, D, in the base of a miniversal deformation of an irreducible plane curve singularity, is partitioned according to the genus of the (singular) fibre, or, equivalently, by the sum of the delta invariants of the singular points of the fibre. The members of the partition are known as the Severi strata. The smallest is the δ-constant stratum, D(δ), where the genus of the fibre is 0. It is well known, by work of Givental’ and Varchenko, to be Lagrangian with respect to the symplectic form Ω obtained by pulling back the intersection form on the cohomology of the fibre via the period mapping. We show that the remaining Severi strata are also co-isotropic with respect to Ω, and mor…