نتایج جستجو برای: کد siesta
تعداد نتایج: 6617 فیلتر نتایج به سال:
در این پژوهش از بین نیمرساناهای گروه iii–v، گالیوم نیترید بدلیل داشتن دمای کوری بالای دمای اتاق و گاف نواری بزرگ به عنوان ماده مورد بررسی انتخاب گردید. سعی ما در این پژوهش یافتن ساختارهایی با ویژگی مناسب برای استفاده در مطالعات ترابردی بوده است. در قسمت اول خواص الکترونی، مغناطیسی نانو روبان خالص، دارای نقص و آلایش یافته gan با عناصر واسطه(cr, mn , fe, ni ) ، با استفاده از رهیافت نظریه تابعی چگ...
OBJECTIVE To evaluate the influence of the siesta in ambulatory blood pressure (BP) monitoring and in cardiac structure parameters. METHODS 1940 ambulatory arterial blood pressure monitoring tests were analyzed (Spacelabs 90207, 15/15 minutes from 7:00 to 22:00 hours and 20/20 minutes from 22:01 to 6.59hours) and 21% of the records indicated that the person had taken a siesta (263 woman, 52+/...
BACKGROUND Previous studies have examined an association between the siesta habit and hypertension, as well as coronary heart disease. However, the relationship between a siesta and the risk of rupture of an intracranial aneurysm (IA) has not yet been established. We aimed to investigate the effects of a siesta on the risk of rupture of IAs. METHODS We prospectively enrolled consecutive patie...
BACKGROUND The siesta (afternoon nap or rest), a common traditional behaviour in tropical areas, may increase the risk of myocardial infarction (MI) since the post siesta cardiovascular response very closely resembles the period soon after waking up in the morning when the onset of acute cardiovascular events is high. METHODS We studied 505 MI survivors and 522 randomly selected controls, mat...
BACKGROUND Several studies have assessed the association between siesta and cardiovascular outcomes. Concern exists that confounding might have distorted these results and contributed to discrepancies among them. This report examines the association between siesta habits and cardiovascular risk factors, including sleep disturbances at night, depressed mood, and measures of subclinical atheroscl...
OBJECTIVES Our aim was to investigate the association between sleeping hours at night and during the siesta and the incidence of obesity in a Mediterranean cohort. METHODS After a median of 6.5 years of follow-up, we included 10,532 or 9,470 participants without chronic disease or obesity at baseline for analyzing the association between the incidence of obesity and nocturnal sleep duration o...
We report the results of a scaling effort that increases both the speed and resolution of the SIESTA magnetohydrodynamic equilibrium code. SIESTA is capable of computing three-dimensional plasma equilibria with magnetic islands at high spatial resolutions for toroidally confined plasmas. Starting with a small-scale parallel implementation, we identified scale-dependent bottlenecks of the code a...
We describe extensions to the siesta density functional theory (dft) code [30], for the simulation of isolated molecules and their absorption spectra. The extensions allow for: • Use of a multigrid solver for the Poisson equation on a finite dft mesh. Non-periodic, Dirichlet boundary conditions are computed by expansion of the electric multipoles over spherical harmonics. • Truncation of a mole...
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