We formulate the problem of the late accretion phase of the evolution of an isothermal magnetic disk surrounding a forming star. The evolution is described by the six-fluid MHD equations, accounting for the presence of neutrals, atomic & molecular ions, electrons, and neutral, positively and negatively charged grains. Only the electron fluid is assumed to be attached to the magnetic field, in o...

We present time-dependent 1D simulations of multifluid magnetic shocks with chemistry resolved down to the mean free path. They are obtained with an adaptive moving grid implemented with an implicit scheme. We examine a broad range of parameters relevant to conditions in dense molecular clouds, with preshock densities 10 cm < n < 10 cm, velocities 10 kms < u < 40 kms, and three different scalin...

The collapse and fragmentation of initially filamentary, magnetic molecular clouds is calculated in three dimensions with a gravitational, radiative hydrodynamics code. The code includes magnetic field effects in an approximate manner: magnetic pressure, tension, braking, and ambipolar diffusion are all modelled. The parameters varied are the ratio of the ambipolar diffusion time to the free fa...

the present paper investigates the advantages of a new class of composite grid structures over conventional grids. thus far, a known grid structure such as orthogrid or isogrid has been used as an orthotropic layer with at most in-plane anisotropy. the present laminated grid is composed of various numbers of thin composite grid layers. the stiffness of the structure can be adjusted by choosing ...

Copyright 1996-2012 Researchpub.org. All rights Reserved. 25 Abstract— In this paper ,the solution of describing the radiation field of V.E.D placed above a plane grid screen is presented. If is shown that both the solution and the related computational. Procedure can be substantially simplified using methods of virtual images and boundary conditions, the method requires the proper Fourier tra...

background: in conventional radiation therapy, regarding normal tissue tolerance, the treatment of bulk tumors is one of the remaining challenges. grid radiation therapy (grt) is a technique to deliver high doses, approximately 15 – 20 gy per fraction, to several small volumes located in a large radiation field. this can be performed using a grid block. the current work has concentrated on the ...

Topological spin textures can serve as non-volatile information carriers. Here we study the current-induced dynamics of an isolated magnetic skyrmion on a nanoscale square-grid pinning pattern formed by orthogonal defect lines with reduced anisotropy. The square grid be pixelated quantized size grid. We demonstrate that position, size, and shape are electrically configurable. center is to may s...

according to this reality that iron bulks because of having ferromagnetic minerals, they have high magnetic intensity, in mining explorations most usual geophysical method  suggested to explore these resources is magnetic method. basically in order to process and interpretation of magnetic anomaly maps several methods be used of which most of these methods are based on try and error. one of usu...

Two distinct redistribution grids - adaptation techniques, spring analogy and elliptic grid generator are applied to two-dimensional steady, inviscid, shocked flows, and the ability of each technique is examined and compared. Euler equations are solved base on Roe's Reimann solver approach to simulate supersonic flow around a sphere, transonic flow about an airfoil and supersonic flow in a symm...