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تعداد نتایج: 7800063 فیلتر نتایج به سال:
It takes time for individuals to move from place to place. This travel time can be incorporated into metapopulation models via a delay in the interpatch migration term. Such a term has been shown to stabilize the positive equilibrium of the classical Lotka-Volterra predator-prey system with one species (either the predator or the prey) dispersing. We study a more realistic, Rosenzweig-MacArthur...
Big Data is impacting and changing the way we live, its core lies in use of machine learning to extract valuable information from huge amounts data. Optimization problems are a common problem many steps learning. In face complex optimization problems, evolutionary computation has shown advantages over traditional methods. Therefore, researchers working on improving performance algorithms for so...
Coarse Particles and Dust Storm Mortality In a paper titled "Episodes of High Coarse Partide Concentrations Are Not Associated with Increased Mortality," Schwartz et al. (1) concluded that "coarse particles from windblown dust are not associated with mortality risk." The authors seem to have overlooked the medical literature on the health effects of the historic U.S. dust storms of the dust bow...
We show that strictly abnormal geodesics arise in graded nilpotent Lie groups. We construct such a group, for which some Carnot geodesics are strictly abnormal and, in fact, not normal in any subgroup. In the 2-step case we also prove that these geodesics are always smooth. Our main technique is based on the equations for the normal and abnormal curves, that we derive (for any Lie group) explic...
Vincent Rigalleau ([email protected]) Magalie Garcia ([email protected]) Catherine Lasseur ([email protected]) François Laurent ([email protected]) Michel Montaudon ([email protected]) Christelle Raffaitin ([email protected]) Nicole Barthe ([email protected]) Marie-Christine Beauvieux (marie-christine.beauvieux@...
A second child with trisomy 5p has been born in the kindred reported by Brimble-combe et al. The cytogenetic findings were similar to those of the index case except that the derivation was paternal instead of maternal. Improved banding techniques enabled more accurate designation of the breakpoints. The clinical and necropsy findings are described. Three non-specific phenotypic malformations an...
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