Aims. The aim of this paper is to study the vertical profile of small dust particles in protoplanetary discs in which angular momentum transport is due to MHD turbulence driven by the magnetorotational instability. We consider particle sizes that range from approximately 1 micron up to a few millimeters. Methods. We use a grid–based MHD code to perform global two-fluid simulations of turbulent ...

INTRODUCTION The discharge ofliquids from vertical tubes with various con­ traction geometries was studied via the unsteady Bernoulli equa­ tion. The temporal variations of the exit velocity and fluid level in the tube were found from the numerical integration of nonlin­ ear differential equations. Sudden, quadratic, and exponential contraction geometries were considered. For inlet to exit area...

In this paper we have studied the effect of free convection on the heat transfer and flow through variable porous medium which is bounded by two vertical parallel porous plates. In this study it is assume that free stream velocity oscillates with time about a constant mean. Periodic temperature is considered in the moving plate. Effect of different parameters on mean flow velocity, Transient ve...

Computed tomography was used to determine the vertical gradient of physical density in peripheral lung tissue of 12 healthy supine subjects, at total lung capacity and residual volume. At total lung capacity the mean (SD) density of peripheral lung tissue at the level of the mid right atrium was 0.0715 (0.017) g/cm3 and the vertical gradient of density was slight. At residual volume the density...

We present the results of an experimental investigation of the flows generated by monodisperse particles settling at low Reynolds number in a stably stratified ambient with an inclined sidewall. In this configuration, upwelling beneath the inclined wall associated with the Boycott effect is opposed by the ambient density stratification. The evolution of the system is determined by the relative ...

ABSTRACT We present ALMA band 6 images of the 12CO, 13CO, and C18O J = 2-1 line emissions for circumstellar disc around HD 169142, at ?8 au spatial resolution. resolve a central gas-depleted cavity, along with two independent near-symmetric ring-like structures in emission: well-defined inner gas ring [?25 au] second relatively fainter diffuse outer [?65 au]. identify localized super-Keplerian ...

where C n(h) is the vertical profile of the refractive index structure constant, V (h) is the vertical profile of the modulus of the wind speed. In the following we always assume that τ0 refers to the wavelength λ0 = 0.5 μm. The MASS instrument implements an approximate method of estimating τ0 from the differentialexposure scintillation index, DESI. DESI is computed for the smallest 2-cm MASS a...