Materials Literature
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The dependence of the spherical aberration coefficient C s on object position z 0 and magnification M is studied using Glaser's bell-shaped field model. It is shown that C s may be written in the forms IMG1 where a i and b i are functions of the lens excitation k 2 . a i and b i are tabulated for a range of values of…
Stress relaxation at constant strains has been studied in crystals of copper and α-brasses containing 10, 20, or 30 at.-% zinc at 77,200, and 291° K after consecutive small plastic deformations. Close to the yield point the relaxation was generally within 1% of the applied stress, but at large deformations, notably wi…
Distributional results in the lower tail, and further percentage points in both tails, are given for the statistic WN2, or NωN2, used in testing for goodness of fit.
The complete structure of cubic hydroxystannates, CaSn (OH)₆ and ZnSn(OH)₆, of space group Pn₃, has been determined by neutron diffraction at 4° K (powder techniques), and with the study of the spectrum of CaSn (OD)₅,₄₅ (OH)₀,₅₅. The 24 hydrogen atoms of the unit cell form two sorts of hydrogen bonds with double well-…
18α-Olean-12-ene, which is in acid-catalysed equilibrium with olean-13(18)-ene (δ-amyrene), has been converted in several steps into olean-12-ene (β-amyrene). Transformation of this hydrocarbon into its 11α-hydroxyderivative and photolysis of the nitrite of the latter gave 11α-hydroxy-1-oximino-olean-12-ene. This oxim…
Thirty two tufted carpets, representing variations in fiber content, pile weight, and cut and loop-pile construction were studied for stress-strain behavior under cyclic loading to 12 lb/in. 2 on an Instron tensile tester. Results are presented conventionally in terms of compression, recovery, matting, and resilience.…
Abstract By measurement of peak areas in the dioxymethylene region of high‐resolution NMR spectra of partly formalized poly(vinyl alcohol), PVA, the relationship between tacticity of PVA, rate of formalization reaction, and stereochemical configuration of poly(vinyl formal) was studied. Formation of cis ‐formal at an…
Abstract The results of a study to characterize samples of single crystals of TlSe grown by the Bridgman‐Stockbarger and zone recrystallization techniques are given. The X‐ray diffraction patterns were indexed as a tetragonal lattice whose parameters were a = 8.02 Å and c = 7.00 Å. The absorption and transmission meas…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBase-catalyzed decomposition of peroxypivalic acid in aqueous solutionEdward Koubek and J. E. WelschCite this: J. Org. Chem. 1968, 33, 1, 445–446Publication Date (Print):January 1, 1968Publication History Published online1 May 2002Published inissue 1 January 1968https://pubs…
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Single and coop erative deoxidations with Mn , Si, and Al are /Jractised in iron baths melted by high-frequency Jurnace and T ammann Jurnace. K inetics oj deoxidation -jnocess are analysed to evaluate the sel){lration-rate oj p rimary inclusions. T he results oj experiments are summarized as Jo llows :
The thermal transition of leucite was studied. The specimens were from Nyiragongo, the Congo and from Vesuvius, Italy, and X-ray powder and single crystal diffraction experiments were carried out from room temperature up to 800°C. At room temperature, the crystal, single and cubic in appearance, is composed of six she…
The thermal degradation of diphenyl carbonate has been examined in the gas and condensed phases. From a detailed analysis of the products it is suggested that the mechanism involves an initial rearrangement to 2-phenoxy benzoic acid followed by several competing reactions of the acid. The effect of phase is discussed.…
An infra-red study of the adsorption of ammonia on silica-supported platinum in the region 3600-1900 cm–1 over a temperature range 25–130°C yields four spectral features: a strong broad absorption at 2960 cm–1 due to the perturbed ν(OH ···) in a surface SiOH ··· NH3 complex, a shoulder at 3280 cm–1 and two fairly shar…
The following heats of formation (kcal. per mole) have been calculated, MeO, +3.5; EtO, -4.0, tert-BuO, -21.6; and tert-BuO 2, 18.6. From the radical heats of formation, the following bond strengths (kcal. per mole) were obtained: RO—H, 104 ±1; R—OH, 91.5 ±1; R—OMe, 81 ±1; R—O, 89 ±1; R—O 2 R, 69 ±1; and R—O 2, 26 ±1,…
E.s.r. spectra have been recorded for the ions [Cr(NO)(H2O)5]2+ and [Cr(NO)(NH3)5]2+ in dilute fluid and rigid solution. The g and A(53Cr) tensors have been calculation for both ions and the A(14N) tensor for the former. Superhyperfine structure was observed in fluid solutions of [Cr(NO)(NH3)5]2+ from Aiso(14N) for th…
Effect of metallographical factors on the rolling fatigue life of 1%C-1.5%Cr bearing steel was investigated, and the most profitable component for the bearing life was discussed.The results obtained are as follows:(1) Metallographical factors affected on the rolling fatigue life of bearing steel were not amount and si…
Measurements of shrinkage temperatures (TS) for fibrous collagen, of equilibrium degree of swelling (v−1) for the same in the amorphous state, and of intrinsic viscosity ([η]) for randomly coiled gelatin are reported. The data were obtained for a large variety of salts which are typical representatives of lyotropic se…
Abstract Results are presented of measurements of the stress dependence of screw dislocation velocities in the {11 2 2} 〈11 2 3〉 slip system (pyramidal slip) of zinc single crystals. The investigations have been carried out on zinc single crystals of 99.999% purity at room temperature. The dislocation mobility has bee…