منابع مشابه
Sand Hill Arthropods in Canadian Grasslands
Sand hill environments in the Canadian grasslands can be classified as sandstone outcrops, upland dunes, sand features associated with water, non-human disturbances, anthropogenic disturbances, beach dunes, or sandbars. Insects and other arthropods use these environments for burrow construction, access to sand-associated host plants, open ground predation and scavenging, thermoregulation, and l...
متن کاملForestation in Hypergraphs: Linear k-Trees
We present a new proof of a result of Lovász on the maximum number of edges in a k-forest. We also apply a construction used in our proof to generalize the notions of a k-hypertree and k-forest to a class which extends some properties of trees, to which both specialize when k=2.
متن کاملHysteresis and after-effects in massive substances. From spin-glasses to the sand hill
2014 We discuss the problem of magnetic hysteresis in the framework of a model of a distribution of thermally activated double well potentials. Having shown the equivalence, at T = 0, of this description with the classical picture of Preisach and Néel we consider specifically the effects associated with the fact that the width of the distribution of the barrier-heights is necessarily finite. We...
متن کاملPotential water yield reduction due to forestation across China
a Southern Global Change Program, USDA Forest Service, 920 Main Campus Dr., Venture II, Suite 300, Raleigh, NC 27606, USA b Southern China Botanical Garden, Chinese Academy of Sciences, Guangzhou, PR China c College of Soil and Water Conservation, Beijing Forestry University, Beijing, PR China d University of British Columbia-Okanagan, 3333 University Way, Kelowna, BC, Canada V1V 1V7 e Coweeta ...
متن کاملProbabilistic Hill-climbing
Many learning tasks involve searching through a discrete space of performance elements, seeking an element whose future utility is expected to be high. As the task of nding the global optimum is often intractable, many practical learning systems use simple forms of hill-climbing to nd a locally optimal element. However, hill-climbing can be complicated by the fact that the utility value of a pe...
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ژورنال
عنوان ژورنال: Botanical Gazette
سال: 1915
ISSN: 0006-8071
DOI: 10.1086/331491