نتایج جستجو برای: bounce back technique

تعداد نتایج: 758954  

2005
V. Bozza G. Veneziano

We consider a two-component regular cosmology bouncing from contraction to expansion, where, in order to include both scalar fields and perfect fluids as particular cases, the dominant component is allowed to have an intrinsic isocurvature mode. We show that the spectrum of the growing mode of the Bardeen potential in the pre-bounce is never transferred to the dominant mode of the post-bounce. ...

Journal: :Journal of Cosmology and Astroparticle Physics 2020

2013
Jianfei Yang Zhengdao Wang Yuehong Qian

A new immersed boundary-lattice Boltzmann method (IB-LBM) is proposed and validated in this work by its application to simulate incompressible viscous flows. The conventional IB-LBM based on the lattice Boltzmann equation with external forcing term, which contains a boundary velocity to represent the effect that the moving boundary exerts on the bounce-back distribution functions, whereas the p...

2003
Pierre Lallemand Li-Shi Luo

We propose a lattice Boltzmann method to treat moving boundary problems for solid objects moving in a fluid. The method is based on the simple bounce-back boundary scheme and interpolations. The proposed method is tested in two flows past an impulsively started cylinder moving in a channel in two dimensions: (a) the flow past an impulsively started cylinder moving in a transient Couette flow; a...

2001
Abhijit Banerjee Francois Bourguignon Esther Duflo Deon Filmer Karla Hoff Martin Rama Dominique van de Walle Michael Lokshin Martin Ravallion

We estimate a panel data model of household incomes in Hungary and Russia during the 1990s. The model allows for nonlinear dynamics in endogenous household incomes and for endogenous attrition. Our estimates reveal nonlinearity in the dynamics, consistent with the claim that income inequality is bad for growth in mean income. We do not find evidence of an unstable dynamic equilibrium, such that...

2000
Michael Lokshin Martin Ravallion

It is possible in theory that the persistent poverty that has emerged in many transition economies is due to underlying nonconvexities in the dynamics of household incomes, such that a vulnerable household will never recover from a sufficiently large but short-lived shock to its income. To test the theory we estimate a dynamic panel data model of household incomes with nonlinear dynamics and en...

2003
A. M. ARTOLI A. G. HOEKSTRA P. M. A. SLOOT A. M. Artoli A. G. Hoekstra P. M. A. Sloot

We present an analysis of the accuracy of the lattice Boltzmann BGK (LBGK) method in simulating pulsatile blood flow in a model of the Human Abdominal Aorta. The flow is driven by a systolic pressure cycle. As a benchmark, we consider fully developed pulsatile flow in a straight tube. We compare velocity profiles and shear stress to the analytical Womersley solutions. The accuracy of the bounce...

2005
Gerald V. Dunne Hyunsoo Min

Abstract We present a general numerical method for computing precisely the false vacuum decay rate, including the prefactor due to quantum fluctuations about the classical bounce solution, in a selfinteracting scalar field theory modeling the process of nucleation in four dimensional spacetime. This technique does not rely on the thin-wall approximation. The method is based on the GelfandYaglom...

Journal: :IEICE Transactions 2006
Toru Nakura Makoto Ikeda Kunihiro Asada

This paper demonstrates a feedforward active substrate noise cancelling technique using a power supply di/dt detector. Since the substrate is usually tied with the ground line with a low impedance, the substrate noise is closely related to the ground bounce which is proportional to the di/dt when inductance is dominant on the ground line impedance. Our active cancelling detects the di/dt of the...

Journal: :Displays 2011
Tzu-Chieh Lin Sheng-Fa Liu Chih-Yu Chao

In this article, we propose a mechanical rubbing method to eliminate the optical bounce and decrease the response time of homeotropic liquid crystal (LC) cells with sputtered silicon dioxide alignment films. After gently rubbing the inorganic alignment film (sputtered silicon oxide, SiO2), the decreasing polar anchoring energy results in slightly smaller pretilt angle which gives LC a toppling ...

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