Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Grains definition

The key points in this definition are that the material should interad in an appropriate manner with the organism into which it is implanted (presumably, do no harm), and it should serve its intended function. However, this coarse-grained definition offers us no insights as to how to achieve... [Pg.397]

TPV componnds meet antomotive safety requirements for reduced windshield fogging Santorpene TPV fogging tests show 0.7 mg, and Sarlink TPV, composed of Stamy-lan P polypropylene and Kelltan TP EPDM-modifled polypropylene, shows less than 1.0 mg. FnUy vnlcanized Santoprene is used as a modifier in TPO formulations for soft skins, improved grain definition retention, and cold flow for complex shapes. [Pg.618]

Discussion. The turbidity of a dilute barium sulphate suspension is difficult to reproduce it is therefore essential to adhere rigidly to the experimental procedure detailed below. The velocity of the precipitation, as well as the concentration of the reactants, must be controlled by adding (after all the other components are present) pure solid barium chloride of definite grain size. The rate of solution of the barium chloride controls the velocity of the reaction. Sodium chloride and hydrochloric acid are added before the precipitation in order to inhibit the growth of microcrystals of barium sulphate the optimum pH is maintained and minimises the effect of variable amounts of other electrolytes present in the sample upon the size of the suspended barium sulphate particles. A glycerol-ethanol solution helps to stabilise the turbidity. The reaction vessel is shaken gently in order to obtain a uniform particle size each vessel should be shaken at the same rate and the same number of times. The unknown must be treated exactly like the standard solution. The interval between the time of precipitation and measurement must be kept constant. [Pg.729]

With foams, one is dealing with a gaseous state or phase of matter in a highly dispersed condition. There is a definite relationship between the practical application of foams and colloidal chemistry. Bancroft (4) states that adopting the very flexible definition that a phase is colloidal when it is sufficiently finely divided, colloid chemistry is the chemistry of bubbles, drops, grains, filaments, and films, because in each of these cases at least one dimension of the phase is very small. This is not a truly scientific classification because a bubble has a film round it, and a film may be considered as made up of coalescing drops or grains. ... [Pg.74]

Figure 6.11 (a) Definition of the dihedral angle, , at a junction of three grain boundaries in a polycrystalline solid, (b) Schematic illustration of the shape of an inclusion phase for different dihedral angles. [Pg.173]

HD by definition, refers to the 50% distance for a line source only. The distribution of developed grains differs for different sources and so does the distance within which 50% of the grains lie. In each case that distance can be expressed as a multiple of HD. By limiting the term HD to refer only to the line source, it retains a unique value for each specimen, and can thus serve as a normalizing unit. From Salpeter and McHenry (9). [Pg.253]

A collaboration abstracts a detailed dialog or protocol. In real life, every action we talk about—for example, I got some money from the cash machine —actually represents some sequence of finer-grained actions, such as I put my card in the machine I selected cash I took my money and my card. Ary action can be made finer. But at ary level, there is a definite postcondition. A collaboration spec expresses the postcondition at the appropriate level of detail— There s more cash in my pocket, but my account shows less. Thus, we defer details of interaction protocols. [Pg.206]

We should write down descriptions of the more-detailed actions in this case we would likely still call each finer-grained action a use case. To begin with, let s keep it relatively informal, extending the dictionary with action definitions. [Pg.597]

General properties and definitions of polarizabilities can be introduced without invoking the complete DFT formalism by considering first an elementary model the dipole of an isolated, spherical atom induced by a uniform electric field. The variation of the electronic density is represented by a simple scalar the induced atomic dipole moment. This coarse-grained (CG) model of the electronic density permits to derive a useful explicit energy functional where the functional derivatives are formulated in terms of polarizabilities and dipole hardnesses. [Pg.335]

It has been observed by some experimenters, but not by the others, that the experimental lattice constant a in crystals of ordinary size was different from that, a + A a, found in extremely small crystals. A recent example72 refers to vacuum-deposited copper grains whose diameter D (they were, of course, not spherical) varied from 24 to 240 angstroms. The lattice constants calculated from the (111) reflexions increased from 3.577 to 3.6143 angstroms when the grain volume decreased, but the particle size had no definite effect on the reflexions from the 220 plane. [Pg.26]


See other pages where Grains definition is mentioned: [Pg.469]    [Pg.468]    [Pg.469]    [Pg.266]    [Pg.617]    [Pg.500]    [Pg.500]    [Pg.124]    [Pg.469]    [Pg.468]    [Pg.469]    [Pg.266]    [Pg.617]    [Pg.500]    [Pg.500]    [Pg.124]    [Pg.389]    [Pg.463]    [Pg.69]    [Pg.87]    [Pg.614]    [Pg.694]    [Pg.271]    [Pg.1156]    [Pg.52]    [Pg.407]    [Pg.406]    [Pg.86]    [Pg.65]    [Pg.99]    [Pg.99]    [Pg.334]    [Pg.120]    [Pg.362]    [Pg.496]    [Pg.103]    [Pg.13]    [Pg.174]    [Pg.10]    [Pg.431]    [Pg.181]    [Pg.385]    [Pg.127]    [Pg.260]    [Pg.270]    [Pg.18]   
See also in sourсe #XX -- [ Pg.34 ]




SEARCH



Dust grains definition

Grain boundary definition

Grain growth definition

© 2024 chempedia.info