نتایج جستجو برای: n8
تعداد نتایج: 384 فیلتر نتایج به سال:
PURPOSE To characterize refractive error, presbyopia, and spectacle correction among adults aged ≥40 years in Timor-Leste in 2010 and examine the impact of the National Spectacle Program by comparing results to those obtained 5 years earlier. METHODS A population-based, cross-sectional survey sampled 50 clusters of 45 people each. Participants with uncorrected and undercorrected refractive er...
Zheng, Tao, Wenyan Li, Jun Wang, Bella T. Altura, and Burton M. Altura. Sphingomyelinase and ceramide analogs induce contraction and rises in [Ca]i in canine cerebral vascular muscle. Am J Physiol Heart Circ Physiol 278: H1421–H1428, 2000.—Studies were designed to investigate effects of neutral sphingomyelinase (N-SMase) and ceramide analogs as well as phosphorylcholine on vascular tone and Ca2...
For a set A of nonnegative integers, let R2(A,n) and R3(A,n) denote the number solutions to n=a+a′ with a,a′∈A, a<a′ a≤a′, respectively. In this paper, we prove that, if A⊆N N is positive integer such that R2(A,n)=R2(N∖A,n) for all n≥2N−1, then any θ 0<θ<2log2−log342log2−9log3, cardinality n≤x R2(A,n)=n8+O(n1−θ) equals x+O(x1−δ) some constant δ. The similar result holds R3(A,n). These impro...
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