نتایج جستجو برای: numerical calculation

تعداد نتایج: 424241  

2003
David A. Powell Kourosh Kalantar-zadeh Wojtek Wlodarski

A technique for analysing the sensitivity of a surface acoustic wave (SAW) device is presented, based on the numerically obtained Green’s function. It is applied to devices based on a 36◦-YX LiTaO3 substrate with a ZnO guiding layer. The capability of these devices for gas and liquid sensing is shown by studying parameters such as mass sensitivity and electromechanical coupling coefficient. Dev...

2015
Qin Zhang Manlai Zhang Zhihong Zhou Shizhong Wei

The local head loss of tee could be calculated with the determination of local resistance coefficient by CFD simulation and test. Based on the mesh-independent feature identified, the flow field inner tee was numerically simulated by the standard k ε turbulent model and SIMPLEC algorithms, which has revealed the mainstream was obliged to turn to the opposite side of tee junction, and a rise in ...

2000
H. Schraube W. Heinrich G. Leuthold V. Mares S. Roesler

2002
Chris Homescu I. M. Navon

Linearization of 1-D Euler equations about a discontinuous solution is discussed from both the theoretical and numerical point of view. Estimates for the norm of the solution of the linearized system are shown to be valid for the case presented. Numerically, the linearization is performed following the guidelines of tangent linear model and sensitivities with respect to a ow parameter are compu...

2003
I. Zagorodnov T. Weiland

Collimators are used to eliminate halo particles from the beam. To relax the wakefield effects a gradual transition from a large to a small aperture is used. However, the existing computer codes face severe problems for long tapered transitions. Two main sources of the problems are the grid dispersion and the staircase geometry approximation. Using recently developed time domain numerical appro...

2016
Hikaru Takeuchi Tomomi Nagase Yasuyuki Taki Yuko Sassa Hiroshi Hashizume Rui Nouchi Ryuta Kawashima

Cognitive training, including fast simple numerical calculation (FSNC), has been shown to improve performance on untrained processing speed and executive function tasks in the elderly. However, the effects of FSNC training on cognitive functions in the young and on neural mechanisms remain unknown. We investigated the effects of 1-week intensive FSNC training on cognitive function, regional gra...

2008
V. A. Yerokhin

We present a numerical evaluation of the loop-after-loop contribution to the second-order self-energy for the ground state of hydrogenlike atoms with low nuclear charge numbers Z. The calculation is carried out in the Fried-Yennie gauge and without an expansion in Zα. Our calculation confirms the results of Mallampalli and Sapirstein and disagrees with the calculation by Goidenko and coworkers....

2013
Zijun Li Chuanjin Lin Yuqun Chen Haiguang Wang Yongshun Huang

In this paper, the problems of calculating and solution about electromagnetic fields were studied. An accurate theory model was established which can apply in high-performance numerical calculation. The new calculating method was proposed using Maxwell’s equations in the circumstances of that electromagnetic field is static, contains axial symmetric charge distribution, finite, differentiable a...

2006
M. S. Ridout

If the chemical guanidine hydrochloride is added to a dividing culture of yeast cells that carry a yeast prion, the proportion of cells that have the prion gradually decreases over time. Stochastic models to describe this process of ‘curing’ have been developed in earlier work. The present paper investigates the use of numerical Laplace inversion methods to calculate curing curves and contrasts...

2004
William J. Strong

The purpose of this study was to investigate a numerical method for calculating impedances and standing wave patterns of flute structures. To this end, the physical dimensions of flute joints and tone holes were used to compute impedance and standing waves as a function of frequency for several different fingerings. Numerically computed resonance frequencies for head joint, middle and foot join...

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