نتایج جستجو برای: rng
تعداد نتایج: 866 فیلتر نتایج به سال:
The use of graphics processing units (GPUs) in simulation applications offers a significant speed gain as compared to computations on central processing units (CPUs). Many simulation methods require a large number of independent random variables generated at each step. We present two approaches for implementation of random number generators (RNGs) on a GPU. In the one-RNG-per-thread approach, o...
Cardiorespiratory fitness has been shown to protect and enhance cognitive and brain functions, but little is known about the cortical mechanisms that underlie these changes in older adults. In this study, functional near infrared spectroscopy (fNIRS) was used to investigate variations in oxyhemoglobin [HbO2] and in deoxyhemoglobin [HHb] in the dorsolateral prefrontal cortex (DLPFC) during the p...
While the mass density current penetrates the stagnant fluid, a plunge point occurs. In this regard, the boundary of the dense fluid with ambient fluid is determined at the plunge point height. In this research, the hydraulic parameters of the dense flow and the bed slope of the stagnant fluid which have a significant effect on the plunge point have been investigated under the two turbulence mo...
The accuracy of stochastic (Monte Carlo) simulations is critically dependent on the quality of their random number generator (RNG). Recently, such simulations are increasingly implemented in a parallel form on field-programmable gate arrays (FPGAs) for higher performance. Fast, high-quality RNGs with periods long enough for extended simulation (e.g., the Mersenne Twister) have been well-proven ...
Two collections of oligonucleotides have been designed for preparing pangenomic human and mouse microarrays. A total of 148,993 and 121,703 oligonucleotides were designed against human and mouse transcripts. Quality scores were created in order to select 25,342 human and 24,109 mouse oligonucleotides. They correspond to: (i) a BLAST-specificity score; (ii) the number of expressed sequence tags ...
در این پژوهش شبیه سازی عددی توزیع و پخش ذرات در داخل یک ساختمان سه بعدی و با استفاده از نرم افزار فلوئنت، مورد مطالعه قرار گرفته است. با به کارگیری دیدگاه اویلری برای فاز سیال و اعمال روش حجم محدود در گسسته سازی معادلات حاکم، معادلات بقای جرم و مومنتم حل شده است. حرکت ذرات معلق با استفاده از دیدگاه لاگرانژی و با در نظر گرفتن نیروهای درگ، گرانش، لیفت و براونی ( و نیروی ترموفورسیس برای گازهای co ...
The scientific literature is filled with examples of bad random number generators (RNGs), and a bad RNG can completely ruin a researcher’s analysis. See Coddington (1994, 1996) for examples and discussion from the field of physics. Examples from economics are difficult to find, in part, because many economists do not bother to test the RNGs that they use in their applied work. This may be due t...
The unsteady separated turbulent flow around an oscillating airfoil pitching in a sinusoidal pattern in the regime of low Reynolds number is investigated numerically employing the URANS approach with two advanced turbulence models, namely the RNG kmode and Transition SST model, and the DES approach based on the SST kmodel. A comparison with experimental data shows that the SST kbased D...
The purpose of this paper is to evaluate the effects of a building parameter, namely ceiling configuration, on indoor natural ventilation. The computational fluid dynamics (CFD) code Phoenics was used with the RNG k-ε turbulence model to study wind motion and ventilation flow rates inside the building. All the CFD boundary conditions were described. The simulation results were first validated b...
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