نتایج جستجو برای: hutchinson
تعداد نتایج: 1886 فیلتر نتایج به سال:
The Hutchinson estimator defines an estimate of the trace of a matrix M , based on a bilinear form with independent vectors y of zero-mean unit-variance uncorrelated entries. This technique is particularly useful when M is only implicitly given but the matrix-vector product My can be efficiently computed without M being explicitly formed. Well-known examples in practice are M = A−1, and more ge...
The duality between "niche" and "biotope" proposed by G. Evelyn Hutchinson provides a powerful way to conceptualize and analyze biogeographical distributions in relation to spatial environmental patterns. Both Joseph Grinnell and Charles Elton had attributed niches to environments. Attributing niches, instead, to species, allowed Hutchinson's key innovation: the formal severing of physical plac...
BACKGROUND Hutchinson-Gilford progeria syndrome is an ultrarare segmental premature aging disease resulting in early death from heart attack or stroke. There is no approved treatment, but starting in 2007, several recent single-arm clinical trials administered inhibitors of protein farnesylation aimed at reducing toxicity of the disease-producing protein progerin. No study assessed whether trea...
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