نتایج جستجو برای: homogeneous dispersion

تعداد نتایج: 131016  

Journal: :Molecular biology and evolution 1998
D R Bickel B J West

The fractal doubly stochastic Poisson process (FDSPP) model of molecular evolution, like other doubly stochastic Poisson models, agrees with the high estimates for the index of dispersion found from sequence comparisons. Unlike certain previous models, the FDSPP also predicts a positive geometric correlation between the index of dispersion and the mean number of substitutions. Such a relationsh...

1999
Erik Brynjolfsson Michael D. Smith

There have been many claims that the Internet represents a new nearly “frictionless market.” Our research empirically analyzes the characteristics of the Internet as a channel for two categories of homogeneous products—books and CDs. Using a data set of over 8,500 price observations collected over a period of 15 months, we compare pricing behavior at 41 Internet and conventional retail outlets....

2008
Marisa Girardi

We consider a sample of 51 distant galaxy clusters at 0.15 ∼< z ∼< 0.9 (< z >∼ 0.3), each cluster having at least 10 galaxies with available redshift in the literature. We select member galaxies, analyze the velocity dispersion profiles, and evaluate in a homogeneous way cluster velocity dispersions and virial masses. We apply the same procedures already recently applied on a sample of nearby c...

Journal: :Acta of bioengineering and biomechanics 2014
Pavel Skacel Jiri Bursa

Several constitutive models have been proposed for description of mechanical behaviour of soft tissues containing collagen fibres. The model with aligned fibres is modified in this paper to take the dispersion of fibre orientations into account through angular integration and it is compared with the model that is defined through generalized structure tensor. The paper is focused on the effect o...

Journal: :CoRR 2014
Nicolás Guarín-Zapata Juan Gómez

We evaluated the performance of the classical and spectral finite element method in the simulation of elastodynamic problems. We used as a quality measure their ability to capture the actual dispersive behavior of the material. Four different materials are studied: a homogeneous non-dispersive material, a bilayer material, and composite materials consisting of an aluminum matrix and brass inclu...

2004
O. J. G. Silveira L. F. Ziebell R. S. Schneider R. Gaelzer

Along the last few years we have conducted several investigations on waves in inhomogeneous plasmas, using the concept of effective dielectric tensor, which has been proposed as the correct dielectric tensor for the description of dielectric properties of inhomogeneous plasmas [1]. Among these investigations, we have considered cases where the magnetic field is homogeneous and other plasma para...

Journal: :European Journal of Mechanics A-solids 2023

In this paper, we study Lamb waves propagating in a discrete strip, whose microstructure is represented by either monatomic or diatomic triangular lattice. considering the in-plane vector problem, derive an analytical solution for dispersion relation of waves. Additionally, investigate main features eigenmodes system, which describe how lattice strip vibrates at different frequencies. Further, ...

2017
Gennady S. Bisnovatyi-Kogan

In this article, we present an overview of the new developments in problems of the plasma influence on the effects of gravitational lensing, complemented by pieces of new material and relevant discussions. Deflection of light in the presence of gravity and plasma is determined by a complex combination of various physical phenomena: gravity, dispersion, refraction. In particular, the gravitation...

Journal: :Physical review. E, Statistical, nonlinear, and soft matter physics 2011
R Bachelard T Dauxois G De Ninno S Ruffo F Staniscia

We show that, in the continuum limit, the dynamics of Hamiltonian systems defined on a lattice with long-range couplings is well described by the Vlasov equation. This equation can be linearized around the homogeneous state, and a dispersion relation, which depends explicitly on the Fourier modes of the lattice, can be derived. This allows one to compute the stability thresholds of the homogene...

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