Weiss-field model

From the Weiss field model, the relation between Jex, the effective exchange integral of equation 90, and Te for the case L — 0 can be derived from the fact that the energy of interaction with the Weiss field, — fx w = —gSfjLBHw, is equal to the exchange energy, —Jex Si-S, = — 2zJ xS2, where z is the number of nearest neigh-... 

It should be realized, however, that the Weiss field model first con-... 

Those curves that do not approach T = 0°K with zero slope are not realized in nature. The N6el model is a molecular field model, and is subject to the same criticisms as the Weiss field model for ferromagnets. Kaplan (325) has applied spin wave theory to ferri-magnets and worked out a Bloch Tz/2 law, similar to equation 98, for low temperatures. In this approximation M /M% remains constant,... 

The sublattice magnetisation has been studied as a function of temperature up to the Neel temperature, and good agreement can be obtained with a Weiss-field model if a strong positive B-B interaction between the Ni + and... 

To integrate our continuum model with standard DFT algorithms, Wei and co-workers introduce the reaction field potential RF = — 0 with 4>o being the solution of the Poisson equation in homogeneous media [132]. The reaction field potential is the electric potential induced by the polarized solvent and its incorporation leads to the following effective energy function ... 

Wei reported radius- and chirality-dependent conformations of PE on CNT interfaces by MD with the AMBER (assisted model building with energy refinement) force field. ... 

A. technique not as commonly used as chemical methods it can none the less provide good yields of eluted antigen in a small volume without subjecting it to extremes of pH or denaturants (40, 41). It requires the use of additional apparatus, either home-made or commercial (e.g. Bio-Rad Model 422 electro-eluter). The washed matrix canying the adsorbed antigen has to be transferred from the column to an electroelution tube for the process to be carried out, so is more suited to self-packed or batch processed material rather than ready-packed colimuis. The antigen is eluted by the electric field into a small chamber sealed with a dialysis membrane and can be recovered in a small volume (400-600 JJ.1) of suitable buffer. The membrane enclosed chamber can be obtained with membranes of different molecular wei t cut-off to suit the size of the protein being eluted. 

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