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Drinking motives and links to alcohol use in 13 european countries
(Alcohol Research Documentation, Inc., 2014-05-01)
Objective: The purpose of this study was to test the structure and endorsement of drinking motives and their links to alcohol use among 11- to 19-year-olds from 13 European countries. Method: Confirmatory factor analysis, ...
Stochastic permanence, stationary distribution and extinction of a single-species nonlinear diffusion system with random perturbation
(Hindawi Limited, 2014-01-01)
We analyze the influence of stochastic perturbations on a single-species logistic model with the population's nonlinear diffusion among.. patches. First, we show that this system has a unique positive solution. Then we ...
Examining variations in hospital productivity in the english nhs
(Springer Nature, 2014-02-25)
Numerous papers have measured hospital efficiency, mainly using a technique known as data envelopment analysis (DEA). A shortcoming of this technique is that the number of outputs for each hospital generally outstrips the ...
Mixing state of black carbon aerosol in a heavily polluted urban area of china: implications for light absorption enhancement
(Informa UK Limited, 2014-05-19)
Black carbon (BC) is important for climate forcing, and its effects on the Earth's radiative balance remain a major uncertainty in climate models. In this study, we investigated the mixing state of refractory black carbon ...
An xfem-based methodology for fatigue delamination and permeability of composites
(Elsevier BV, 2014-01-01)