Materials Literature
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A method of computing demagnetizing factors using a resistance network analog or an electrolytic tank has been devised, and the demagnetizing factors for spheres, rods, disks, and tubes have been computed for the case μ = ∞. When the size of the model on the analog is appropriate, the value obtained for a sphere is wi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBiosynthesis of Plant Steroids. I. The Origin of the Butenolide Ring of Digitoxigenin1Edward Leete, Harry Gregory, and Eduardo G. GrosCite this: J. Am. Chem. Soc. 1965, 87, 15, 3475–3479Publication Date (Print):August 1, 1965Publication History Published online1 May 2002Publ…
The Raman spectrum of crystalline sulfur dioxide has been recorded at several temperatures between 9 and 185 °K. The main features are in accord with those predicted from the factor group analysis for the known structure of the crystal. Additional peaks were also observed, some arising from isotopic species and lattic…
A rapid and simple method is described for the bacteriological examination of contaminated surfaces. It uses an imprint process with ‘agar sausages’ sterilized in polyamide casings.
Phase relations in the system PbO‐GeO 2 were determined using the quenching technique. The five compounds detected were: 4PbO‐GeO 2 , 3PbO‐2GeO 2 , PbO‐GeO 2 , and PbO‐4GeO 2 . The 3:2 and 1:1 compounds melt congruently at 744° and 799°, respectively. The 4:1 compound melts incongruently at 726°C to PbO plus liquid, w…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics and Mechanism of Thermal Decomposition of Sodium Dithionite in Aqueous SolutionR. G. Rinker, Scott Lynn, D. M. Mason, and W. H. CorcoranCite this: Ind. Eng. Chem. Fundamen. 1965, 4, 3, 282–288Publication Date (Print):August 1, 1965Publication History Published onlin…
Abstract Qualitative and quantitative results from previous studies of the thermoluminescence induced in polyethylene by irradiation are used in an attempt to deduce the main polyethylene electron traps. It is concluded that the most probable traps are the molecular chains themselves, the different degrees of molecula…
The solidification mechanism of melts of monotectic composition is considered. It is shown that important microstructural differences can arise as a result of changes in the relative magnitudes of the interfacial energies between the two liquids and the solid substrate. Conflicting results from previous publications a…
A technique is developed for estimating the rigid-disk partition function near close packing, by evaluating the specific free-energy contributions from correlated motion of larger and larger sets of contiguous particles. In terms of the reduced density θ=A0/A (A0 is the close-packed value of the closed system's area A…
The decay of individual fluorescent transitions excited by monochromatic radiation was measured for most rare earths in hexagonal LaCl3 and other lattices. At 4°K the decay was found to be invariably exponential within the experimental errors; at higher temperatures it could occasionally be represented by several expo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Adsorption and Reaction of Coordination Complexes on Silica GelRobert L. Burwell Jr., Ralph G. Pearson, Gary L. Haller, Pueh B. Tjok, and Stephen P. ChockCite this: Inorg. Chem. 1965, 4, 8, 1123–1128Publication Date (Print):August 1, 1965Publication History Published onl…
Lanthanum‐doped Ba 0.6 Sr 0.4 4TiO (OH) 2 C 2 O 4 .4H 2 O was prepared by precipitation from a pH‐controlled oxalic acid solution for conversion to the titanate. TGA and DTA support the proposed formula of a hydrated, mixed hydroxyoxalate. Density and resistivity measurements of the titanates are correlated as a funct…
Shear stress-shear strain curves of ordered and disordered Cu3-Au single crystals have been obtained over the temperature range 77 to 500°K. Analysis of the data indicates (i) the strain hardening rate in stage II, θII, for the disordered condition is essentially independent of temperature, and (ii) θII for the ordere…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe meso Reactivity of Porphyrins and Related Compounds. I. NitrationR. Bonnett and G. F. StephensonCite this: J. Org. Chem. 1965, 30, 8, 2791–2798Publication Date (Print):August 1, 1965Publication History Published online1 May 2002Published inissue 1 August 1965https://pubs…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDiffusional Effects in Gas-Solid ReactionsJohn Shen and J. M. SmithCite this: Ind. Eng. Chem. Fundamen. 1965, 4, 3, 293–301Publication Date (Print):August 1, 1965Publication History Published online1 May 2002Published inissue 1 August 1965https://pubs.acs.org/doi/10.1021/i16…
Single crystals of bismuth germanate Bi4(GeO4)3 having the eulytine structure, space group Td6, were grown. They were crucible-free pulled from a pool of molten material produced in its own powder at 1040°C by a thermal imaging technique. The material has an index of refraction of 2.07 and transmits light between 0.4…
The various methods for the synthesis of optical thin film systems with prescribed properties are reviewed. One general approach is to refine numerically the properties of an initial system. In many problems, however, the choice of a suitable starting design for refinement is not at all obvious. The present paper desc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal Properties of Atactic and Isotactic PolystyreneF. E. Karasz, H. E. Bair, and J. M. O'ReillyCite this: J. Phys. Chem. 1965, 69, 8, 2657–2667Publication Date (Print):August 1, 1965Publication History Published online1 May 2002Published inissue 1 August 1965https://pubs…
A transition from brittle to ductile behaviour of single-phase polycrystals is shown experimentally to be a consequence of a change in slip character rather than of a change in yield stress. In the case of a b.c.c. Fe-Co alloy, deformation by planar glide induces brittleness, whereas the alloy is ductile if it deforms…
The results of an experimental investigation of luminescence and energy trapping in the polymeric systems atactic and isotactic polystyrene and atactic polyvinylnaphthalene are presented. It is shown that the anomalous emission bands observed at 3350 Å in the polystyrenes and at 4100 Å in atactic polyvinylnaphthalene…