The exponential ordering is exploited in the context of nonautonomous delay systems, inducing monotone skew-product semiflows under less restrictive conditions than usual. Some dynamical concepts linked to order, such as semiequilibria, are considered for ordering, with implications determination presence uniform persistence or existence global attractors. Also, some important conclusions on lo...

An N-dimensional generalization of Nicholson’s equation is analyzed. We consider a model including multiple delays, nonlinear coefficients and harvesting term. Inspired by previous results in this subject, we obtain sufficient conditions to guarantee strong uniform persistence. Furthermore, under extra suitable hypotheses prove the existence T-periodic solutions and, reversing prior convenient ...

BACKGROUND Health care systems in OECD countries are increasingly facing economic challenges and funding pressures. These normally demand interventions (political, financial and organisational) aimed at improving the efficiency of the health system as a whole and its single components. In 2009, the English NHS Chief Executive, Sir David Nicholson, warned that a potential funding gap of £20 bill...

Because the World Wide Web is a dynamic collection of information, the Web search tools (or "search engines") that index the Web are dynamic. Traditional information retrieval evaluation techniques may not provide reliable results when applied to the Web search tools. This study is the result of ten replications of the classic 1996 Ding and Marchionini Web search tool research. It explores the ...

In this paper, we present a novel second order in time mixed finite element scheme for the Cahn-Hilliard-Navier-Stokes equations with matched densities. The scheme combines a standard second order Crank-Nicholson method for the Navier-Stokes equations and a modification to the Crank-Nicholson method for the Cahn-Hilliard equation. In particular, a second order Adams-Bashforth extrapolation and ...

In this paper we propose parallel algorithm for the solution of partial differential equations over a rectangular domain using the Crank–Nicholson method by cooperation with the DuFort–Frankel method and apply it on a model problem, namely, the heat conduction equation. One of the well known parallel techniques in solving partial differential equations in cluster computing environment is the do...

In an attempt to test the accuracy of the intra-articular injection treatment of coxarthritis, as used by Waugh (1945), Crowe (1944), and many other investigators; hip-joints of 33 cadavers were injected (Dobson, 1948) with dye solution which jellified on cooling. The technique of injection was similar to that applied in living patients undergoing treatment for osteo-arthritis of the hip. In 19...

362 www.thelancet.com Vol 373 January 31, 2009 3 Shkolnikov V, Leon DA, Adamets S, Andreev E, Deev A. Educational level and adult mortality in Russia: an analysis of routine data 1979 to 1994. Soc Sci Med 1998; 47: 357–69. 4 Murphy M, Bobak M, Nicholson A, Rose R, Marmot M. The widening gap in mortality by educational level in the Russian Federation, 1980–2001. Am J Public Health 2006; 96: 1293...