Materials Literature
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An analysis is presented of a model of plain weft-knitting subjected to uniaxial loading in either direction and also to biaxial loading. For each case, calculated load–extension curves, which are given for a range of values of fabric tightness, illustrate biaxial fabric deformation. Each curve shows a marked dependen…
Stabilizers, R2SnX2, react with allylic chlorine atoms during the induction period and also absorb HC1 to give XH molecules which add to double bonds. Changes in R which facilitate Sn-C bond cleavage are unfavorable, but γ-carbonyl groups are beneficial.
Abstract Several new salt intercalation complexes of halloysite have been prepared and characterized using X-ray powder diffraction techniques taking into account both the position and the shape of the d 001 peaks. The amount of intercalated ion in some fully complexed halloysites has been directly determined using co…
Magnetostriction of fcc Fe–Ni alloys was measured by means of the paper strain gauge in the temperature range of 4.2 K to 296 K. The temperature dependence of spontaneous magnetostriction constant λ 111 was positive, while λ 100 was negative for all the alloys in the whole temperature range. The composition dependence…
In this paper, we report the changes in physical properties of polycarbonate caused by absorbed water and supply basic data for the application of this effect. Absorbed water increases monotonously with increase in relative humidity. Along with the increase in absorbed water, the relaxation time of the β process incre…
The mathematical basis and methodology for determining the effective atomic number and electron density of a tissue are presented. Cranial computed tomography (CT) scanning is performed at two different energy levels, both with and without contrast enhancement. The histology of 15 brain tumors has been correlated with…
The electromigration characteristics of Al/Si alloys are presented. Below about 210°C the failure mode is an open circuit generated by grain boundary electromigration of Al in Al with an activation energy of 0.54 eV. At higher temperatures the failure mechanism transfers to the electromigration of Si in Al through dis…
Abstract In the Brooks‐Herring‐formula the scattering centres are assumed to be independent. The range of validity of this assumption is investigated. For this purpose the scattering of electrons by a pair of impurities is considered as a function of its internal separation and its orientation with respect to the elec…
Two models of a three-fold coordinated continuous random network (C.R.N.), originally constructed to simulate the structure of amorphous arsenic (Greaves and Davis 1974), have been converted by means of certain computer procedures into plausible structures of vitreous boron trioxide, B2O3. Using the original coordinat…
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…