Materials Literature
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Abstract The growth and phase transformation of calcium sulfate dihydrate and hemihydrate crystals were studied at temperatures from 70 to 130 deg. C. At 70 deg. C the second-order rate constant for dihydrate crystal growth did not change by more than 20 percent over a pH range of 3.2 to 9.2. It was also independent o…
The proton NMR relaxation times T1 and T1ρ have been measured as a function of temperature and pressure in the plastic crystals cyclohexane, hexamethylethane (HME) and hexamethyldisilane (HMDS) for pressures up to 2.8 kbar. The T1 data provide information on the molecular reorientation. This motion is only weakly depe…
Proline dehydrogenase and delta1-pyrroline-5-carboxylic acid (PCA) reductase activities were copurified 60- and 130-fold, respectively, from extracts of Clostridium sporogenes. The primary change in the ratio of activites was the result of a loss of proline dehydrogenase activity during dialysis. Both activities were…
Abstract The adsorption of Cu 2+ on kaolinite was studied at different ionic strengths following various treatments of the mineral surface in order to evaluate the conditions influencing adsorption. The data indicate a strong preference of the Na + exchange form of kaolinite for Cu 2+ but a weak affinity of the natura…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBis(N-methylethylenediaminesalicylaldiminato)iron(III) complexes. Magnetic, Moessbauer, and intersystem crossing rate studies in the solid and solution states for a new (S = 1/2) .dblarw. (S = 5/2) spin-equilibrium caseRandall H. Petty, Eric V. Dose, Michael F. Tweedle, and…
The electrostatic potential around a particle in an ordered latex under a deformation is numerically calculated form the nonlinear Poisson-Boltzmann equation by an eccentric cell model. The static rigidity of an ordered latex and the order-disorder Lindemann's law of the crystal melting are obtained from the calculate…
A brief summary of secondary processes in PVC thermal degradation is given. This includes some details of crosslinking and gel formation, cyclization, chain scission and benzene formation, Diels-Alder reaction with additives, as well as oxidation of polyenes.
By analogy with earlier studies on Eu 2+ phosphors the luminescence of the Ce 3+ ‐doped hexagonal aluminates, containing large, divalent or trivalent cations, was also studied in relation to the crystal structure of the host lattices. The u.v. band ascribed to the luminescence of Ce 3+ ions is found at a relatively sh…
The Mossbauer effect of the 21.53 keV transition of 151 Eu was utilised to study EuNi 5 , EuMg 2 and their hydrides. Measurements of isomer shift and hyperfine field were made at various temperatures between 77K and 2.6K. The experimental data were used to interpret the hydrogen absorption mechanism acting in these in…
The pitting resistances of four high strength, high ductility, stainless steels (TRIP steels) were compared with those of the two alloys most widely used in implants today: Type 316L stainless steel and a cast Co-Cr-Mo alloy (Vitallium). Each of the alloys in several metallurgical conditions was tested in a physiologi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMono- and biscarbonyl complexes of iron(II) tetraphenylporphyrinB. B. Wayland, L. F. Mehne, and J. SwartzCite this: J. Am. Chem. Soc. 1978, 100, 8, 2379–2383Publication Date (Print):April 1, 1978Publication History Published online1 May 2002Published inissue 1 April 1978http…
The epidermal cells which migrate over the wound surface of the amputated limb of the adult newt were examined using the scanning electron microscope. Specimens were prepared routinely for scanning electron microscopy or were embedded in Epon 812 for light microscopic observations. A cuff of epidermal cells was seen a…
The magnetic susceptibilities of YCo 2 and LuCo 2 at 4.2 and 77K, as determined from magnetisation measurements in fields up to 38 Tesla, are found to increase with field in an anomalous way.
Colour centres in vitreous silica are discussed in. terms of dangling bond defects on silicon and oxygen sites. Because of the large cation-anion electronegativity difference it is argued that neutral singly occupied states will be unstable, decomposing into empty positively charged silicon sp3 states and doubly occup…
Phenomenological theory of phase separation of a binary alloy at low temperatures is developed. The equation of motion for a structure function is derived. The damping coefficient is chosen to give a correct shape of the structure function at large wave numbers. On a scaling assumption we have a slow asymptotic decay…
A comparison of intravenous to intracarotid artery (ICA) administration of 14C-BCNU (1,3-bis(2-chloroethyl)-1-nitrosourea) was made in squirrel monkeys. Radioactivity was measured as soluble drug products and as RNA-, DNA-, and protein-bound radioactivity. The ICA administration of BCNU achieved 190% to 280% higher br…
Recommended levels of a number of metals for Great Lakes Water Quality Objectives were found to be very toxic to freshwater algae when these metals were present simultaneously in lake water and culture medium. The diatom tested was more sensitive to metal toxicity than the blue-green and green algae. Key words: metals…
Alternating current microcalorimetry was used to measure the specific heat of 4-$n$-pentylphenylthiol-4\ensuremath{'}-$n$-octyloxybenzoate in the nematic, smectic-$A$, and smectic-$C$ phases. Critical exponents were found to be consistent with the superfluid analogy of de Gennes for the nematic to smectic-$A$ transiti…
A frequency domain technique is demonstrated which permits the determination of the homogeneous linewidth and relaxation rates of inhomogeneously broadened transitions in crystals, liquids, and glasses. The density-matrix formalism is employed to explain the origins of the intensity-dependent dichroism and birefringen…
An ordered ilmenite phase of the compound MnSnO3 is evidenced from powder patterns. The hexagonal and rhombohedral unit-cell parameters are respectively: a = 5.358 (1), c = 14.505 (4) Å, Z = 6 and a = 5.740 (1) Å, α = 55.65 (2)°, Z = 2: Dm = 6.11, Dx = 6.12 g cm−3.