Probability crystal

The probable crystal stmcture of this salt has been described (14) as a complex of two dianions and two cations forming a large polyatomic ring. By implication this type of molecular packing probably appHes to many other similar pigments. 

Uranium, too, is widely distributed and, since it probably crystallized late in the formation of igneous rocks, tends to be scattered in the faults of older rocks. Some concentration by leaching and subsequent re-precipitation has produced a large number of oxide minerals of which the most important are pitchblende or uraninite, U3O8, and camotite, K2(U02)2(V04)2.3H20. However, even these are usually dispersed so that typical ores contain only about 0.1% U, and many of the more readily exploited deposits are nearing exhaustion. The principal sources are Canada, Africa and countries of the former USSR. 

Can Modeling Help Solve The Remaining Problems In fiber x-ray diffraction analysis the convergence to the most probable crystal structure generally proceeds via the minimization of x-ray residuals, such i... 

NEED TO MOVE TUBE DOWN 3.2 DIVISIONS CHI (ZERO) = -0.015 OMEGA ERROR FROM CENTERING = -0.000 PROBABLY CRYSTAL HEIGHT APPARENT TTH (ZERO) = 0.001 APPARENT OMEGA (ZERO) = -0.000... 

The maximum rates of crystallization of the more common crystalline copolymers occur at 80—120°C. In many cases, these copolymers have broad composition distributions containing both fractions of high VDC content that crystallize rapidly and other fractions that do not crystallize at all. Poly(vinylidene chloride) probably crystallizes at a maximum rate at 140—150°C, but the process is difficult to follow because of severe polymer degradation. The copolymers may remain amorphous for a considerable period of time if quenched to room temperature. The induction time before the onset of crystallization depends on both the type and amount of comonomer PVDC crystallizes within minutes at 25°C. 

Pr with a Uf value of 824 cm. , as compared with a predicted value of 820 cm. . In addition to the peaks shown in Figure 2, a number of weak bands were observed, ranging from 403 to 3910 cm. . The absorption at 403 cm." probably arises from the asymmetric Pr—F stretching vibration, but the origin of the other peaks (probably crystal-field components) has not been ascertained as yet. An interesting feature of the above data may... 

The overabundance of garnet and clinopyr-oxene in most Kaapvaal peridotites (Fig. 1) indicates that these phases probably crystallized some time after melt depletion, during melt-rock (Kele-man et al. 1998) or hydrous fluid-rock reaction (as proposed for some Kaapvaal clinopyroxenes (Boyd Mertzman 1987)). The post-depletion addition of substantial garnet and clinopyroxene would explain the discrepancies in melt models for Kaapvaal peridotites based on comparison of Fe-Mg systematics v. Al-Mg systematics (Walter 1999). 

Probably crystallizes in polymorphous forms. Synthetic form red plates, mp 152-153.5. Absorption max (petr ether) 437,462, 494 nm (E 2055, 3100, 2720). Natural form minute, deep-red prisms with bluish luster from hen-Hoe + methanol, mp 177.5. Absorption max (chloroform) 508.5, 475, 446 nm. Somewhat less sol than -carotene Store in darkness in sealed ampoules at law temps (0 C). therap cat Vitamin A precursor. therap cat (vet) Vitamin A precursor for all species except cuts. 

The red-brown CuH and the white ZnH2 cannot be prepared by direct hydrogenation of the metals, but only by solution methods. They are very reactive, presumably nonmetallic, and stoichiometric solids with a pronounced covalent character. CuH probably crystallizes in a wurtzite-type structure. 

Fig. 1 Probable crystal structure biological conformations of prevalent unsaturated fatty acids as suggested by de Jong [ISf A - oleic acid B - linoleic acid C - arachidonic acid left and middle - side and top views of spiral conformation, right - U conformation,... 

According to XRD pattern, three phases could be recognized in the composite fabricated in the Ti-Cr-B system (Fig. 5. A). TiB2 was the predominant phase as expected, while the ceramic matrix consisted of substitutional solid solution ternary compounds (Cro.5Tio.5)B2. A small amount of TiCr intermetallic (3vol.% according to Rietveld analysis) was also recognized. The third one probably crystallized last from the melt. 

Melt. Transition Probability Crystal- Temp. Probability of++... 

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