We examine available data from experiment and recent numerical simulations to explore the supposition that the scalar dissipation rate in turbulence becomes independent of the fluid viscosity when the viscosity is small and of scalar diffusivity when the diffusivity is small. The data are interpreted in the context of semi-empirical spectral theory of Obukhov and Corrsin when the Schmidt number...

We study by direct numerical simulations the effects of Schmidt number ~Sc! on passive scalars mixed by forced isotropic and homogeneous turbulence. The scalar field is maintained statistically stationary by a uniform mean gradient. We consider the scaling of spectra, structure functions, local isotropy and intermittency. For moderately diffusive scalars with Sc51/8 and 1, the Taylor-scale Reyn...

An efficient approach for extracting 3D local averages in spherical subdomains is proposed and applied to study the intermittency of small-scale velocity scalar fields direct numerical simulations isotropic turbulence. We focus on inertial-range scaling exponents locally averaged energy dissipation rate, enstrophy rate corresponding mixing a passive $\theta$ presence uniform mean gradient. The ...

The generation of broadband supercontinua (SC) in air-silica microstructured fibers results from a delicate balance of dispersion and nonlinearity. We analyze two models aimed at better understanding SC. In the first one, we characterize linear dispersion in the Fourier domain from the calculated group velocity dispersion (GVD) without using a Taylor approximation for the propagation constant. ...

Intestinal spirochaetes have become recognized over the last 25 years as an important group of enteric pathogens. These bacteria cause disease in a variety of animal species, especially pigs, poultry, dogs and human beings (Hampson and Stanton, 1996). In pigs, the bacteria cause two well-recognized conditions, swine dysentery (SD), and intestinal spirochaetosis (IS) (Taylor et al., 1980; Hampso...

1. Qureshi AI, Feldmann E, Gomez CR, Johnston SC, Kasner SE, Quick DC, Rasmussen PA, Suri MF, Taylor RA, Zaidat OO. Intracranial atherosclerotic disease: an update. Ann Neurol 2009;66:730– 8. B. A magnetic resonance angiogram demonstrated highgrade stenosis of the left middle cerebral artery involving M1 and M2 segments (see arrows). There appears to be stenosis in the supraclinoid segment of t...

In this study, a Taylor method is developed for numerically solving the high-order most general nonlinear Fredholm integro-differential-difference equations in terms of Taylor expansions. The method is based on transferring the equation and conditions into the matrix equations which leads to solve a system of nonlinear algebraic equations with the unknown Taylor coefficients. Also, we test the ...

We solve the advection-diffusion equation for a stochastically stationary passive scalar $\theta$, in conjunction with forced 3D Navier-Stokes equations, using direct numerical simulations periodic domains of various sizes, largest being $8192^3$. The Taylor-scale Reynolds number varies range $140-650$ and Schmidt $Sc \equiv \nu/D$ $1-512$, where $\nu$ is kinematic viscosity fluid $D$ molecular...

the effect of weak shear thickening and shear thinning on the stability of the taylor-couette flow is explored for a carreau-bird fluid in the narrow-gap limit. the galerkin projection method is used to derive a low-order dynamical system from the conservation of mass and momentum equations. in comparison with the newtonian system, the present equations include additional nonlinear coupling in ...

A review of the literature has revealed a scarcity of attempts to compare directly various methods proposed for the detection of Salmonella organisms in food products. Unfortunately, often it has been assumed that methods useful in clinical or public health laboratories, engaged in identifying cases and carriers, are also suitable for the examination of food products. Furthermore, in many insta...