Interaction zone, definition

The reservoir representing the land (2) is defined as the amount of P contained in the upper 60 cm of the soil. This rather narrow definition of the land reservoir is made because it is through the upper portions of the soil system that the major interactions with the other P reservoirs occur. Specifically, most plants receive their nutritive P needs from the upper soil horizons and the return of P to the soil system by the decomposition of plant matter is also concentrated in this upper soil zone. Similarly, the major interactions with the atmosphere, ground waters, and rivers occur near the... 

Since his early pioneering work on the rhizosphere (a term Hiltner used to describe specifically the interaction between bacteria and legume roots), our knowledge of the subject has greatly increased, and today perhaps a more appropriate definition of the rhizosphere is the field of action or influence of a root (1). The rhizosphere is generally considered to be a narrow zone of soil subject to the influence of living roots, where root exudates stimulate or inhibit microbial populations and their activities. The rhizoplane or root surface also provides a... 

Arid and semi-arid zones may be defined in several ways, but the climatic is the one most commonly accepted. According to that definition, aridity represents a lack of moisture in average climatic conditions (UNEP, 1993). This situation may be caused by one of four climatic conditions, which may interact in the case of specific arid/semi-arid zones continentality, topography, anticyclonic subsidence and oceanic cold currents. 

Because x appears as a parameter in the flamelet model, in numerical implementations a flamelet library (Pitsch and Peters 1998 Peters 2000) is constructed that stores T( , x ) forO < < 1 in a lookup table parameterized by ( ), (4, 2),and x - Based on the definition of a flamelet, at any point in the flow the reaction zone is assumed to be isolated so that no interaction occurs between individual flamelets. In order for this to be true, the probabilities of finding f = 0 and f = 1 must both be non-zero. 

This term is restricted here to equipment in which finely divided solids in suspension interact with gases. Solids fluidized by liquids are called slurries. Three phase fluidized mixtures occur in some coal liquefaction and petroleum treating processes. In dense phase gas-solid fluidization, a fairly definite bed level is maintained in dilute phase systems the solid is entrained continuously through the reaction zone and is separated out in a subsequent zone. 

As already stated in the Introduction, a problem that sometimes arises in pharmacophore approaches is the need to take into account possible adverse steric interactions between inactive compounds in a dataset and the target protein counterpart In these situations, the definition of ligand-forbidden zones by means of the addition of excluded volume spheres to a pharmacophore is nowadays considered a reasonable and effective improvement. 

Prevot V, Croix D, Bouret S, Dutoit S, Tramu G, et al. 1999. Definitive evidence for the existence of morphological plasticity in the external zone of the median eminence during the rat estrous cycle Implication of neuro-glio-endothelial interactions in gonadotropin-releasing hormone release. Neuroscience 94 809-819. 

Secondly, there exists several techniques for integrating approximately over the k-points of the first Brillouin zone (BZ). For materials with ully occupied bands (e.g., semiconductors) the special points method is by far the most efficient (Chadi and Cohen, 1974 Monkhorst and Pack, 1976). The method appeals to the tight-binding picture of atomic interactions, integrating a definite number of interactions exactly with a suitably chosen set of k-points. For metallic systems it is necessary to exhaust the irreducible BZ with a fine mesh, and to choose a method of assigning occupation numbers to the electron states. Several methods prevail, and we refer to Fu and Ho (1983) for a detailed comparison of two schemes. 

The phase composition of the diffusion zone for reactive diffusion in multicomponent systems is rather difficult to predict [19-21]. The reason is that some of the phases which are present in the equihbrium phase diagram do not appear even after a long period of anneaHng [22, 23]. This effect depends on the initial composition of the samples and on the regime of diffusion interaction. Note that in an unHmited binary system, aU intermediate phases will sooner or later definitely appear. The increase of the number of components participating in diffusion results in an increase in the number of the possible regimes for... 

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