Quarter partial

The effect of cation vacancies in alumina-rich samples is to change the slip plane from 111 to 110, with glide still in the (110) direction [140,147-149]). Dissociation into quarter partial dislocations is again observed but with a larger separation [147]. 

Type IV, extra hard (partial denture) alloys, are indicated where high strength, hardness, and stiffness are requked. They are harder, stronger, and less ductile than the type III alloys. These partial-denture alloys are used for cast removable partial dentures, precision-cast fixed bridges, certain three-quarter crowns, saddles, bars, arches, and clasps. 

These coupled second-order partial differential equations do not have a closed-form solution. Accordingly, the approximate numerical technique of finite differences is employed. First, however, the boundary conditions must be prescribed in order to complete the formulation of the problem. Symmetry of the laminate about several planes permits reduction of the region of consideration to a quarter of the laminate cross section in the y-z plane at any value of x as shown in Figure 4-52. There, along the stress-free upper surface. 

The partial faradaic current for formaldehyde oxidation to CO2, calculated from the m/z = 44 ion current, is plotted as a dashed hne in Fig. 13.3b (upper panel). Complete oxidation of formaldehyde to CO2 contributes only one-third (positive-going scan) or one-quarter (negative-going scan) of the corresponding faradaic current peaks (sohd hne in the upper panel of Fig. 13.3b). The difference between the measured net current and the calculated faradaic current, which is plotted as a dotted line in Fig. 13.3b (upper panel), reflects the partial current for incomplete formaldehyde oxidation to... 

For further purification the crystallised acid is boiled for a quarter of an hour under reflux with methylated spirit (one part by volume of spirit for each part by weight of acid), left over night without filtering, then collected again at the pump, washed with alcohol, and finally the almost colourless material is recrystallised from spirit, in which it is dissolved by boiling under reflux. The pure cholic acid separates on cooling in the form of transparent tetrahedral crystals. Melting point 196°. A further quantity of pure substance can be obtained from the mother liquor by concentration. If the acid, partially purified as described, is extracted in a thimble with ethyl acetate, a very fine preparation is obtained. The yield of pure acid amounts to fully 50 g. 

Often the probable partial pressure for one of the masses involved w/ill be estimated through critical analysis of the spectrum. Thus the presence of air in the vacuum vessel (which may indicate a leak) is manifested by the detection of a quantity of O2 (with mass of 32) which is about one-quarter... 

Atom displaced from partially occupied 1c sites to 4n sites with a quarter of the refined occupancy. 

The mineral enargite (Cu3AsS4), an important ore for Cu and As, has a 2 2PT3/4 i/4(o) structure. It is similar to wurtzite except that each T layer occupied is one-quarter filled by As and three-quarters by Cu. The stoichiometry indicates the occupancies of T sites. The structure is shown in Figure 6.9. Because of the simple ordered pattern of partial filling by As and Cu there are four packing layers in the packing unit and two molecules per cell. It also has open C channels. The orthorhombic cell contains two molecules, Q lv, mn2, a0 = 6.46, b0 = 7.43, and c0 = 6.18 A. 

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