Materials Literature
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Design rules proposed rules take account of reduction in strength near welds in heat treated or strain hardened material, at same time taking advantage of strength of material in regions not affected by heat of welding; proposed rules are conservative yet more realistic than previously used design procedures for welde…
This study covers the development of a new basic brick with outstanding resistance to load deformation, slagging, and spalling. This brick is made of 92% high‐purity periclase and 8% high‐purity alumina. During firing for a ceramically bonded brick or in service for a chemically bonded brick, the fine periclase and al…
A Pembina montmorillonite clay has been activated with sulphuric acid at various dosages by the conventional wet process and by the new "dry" process. The products are compared with respect to the fractions of the metal ion components remaining after leaching, the hydrated silica content, the bleaching capacity, and t…
A variety of naturally occurring forms of calcium sulphate dihydrate produce substantially identical differential thermograms under conditions of uniform heating rate and particle size. These thermograms closely resemble those for synthetic dihydrate and β-hemihydrate, showing four endothermic effects and one exotherm…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Preparation of Alkene TrithiocarbonatesJohn A. Durden, Harry A. Stansbury, and William H. CatletteCite this: J. Am. Chem. Soc. 1960, 82, 12, 3082–3084Publication Date (Print):June 1, 1960Publication History Published online1 May 2002Published inissue 1 June 1960https://p…
Transmission electron microscopy has been applied to the study of lattice defects introduced by neutron irradiation of graphite. The dark-field technique has proved to be especially useful for this purpose. The technique of preparation is described and a tentative interpretation of the observations is given.
Abstract The course of secondary crystallization in several polymers was investigated by the density balance method. At the end of primary crystallization it was possible to notice a stepwise increase of density with time, which cannot be fitted to the Avrami equation. The stepwise increase of density follow a further…
Calibration curves of X-ray intensity vs specimen thickness have been prepared for the electron probe microanalyzer by using evaporated films of Cr, Mn, Zn, and Au in the 0–5000 A range. For each element, the x-ray intensity increased almost linearly with thickness; for a given thickness, the x-ray intensity increased…
An apparatus is described for the measurement of the frequencies of resonance of longitudinal and torsional vibrations of circular cylindrical rods at temperatures in the range -180 to +195° C. The values obtained have been used to determine the elastic moduli of single crystals of tin over this range of temperature.…
Abstract The differences in thermal decomposition behavior previously observed between linear and branched polyethylenes have been explored experimentally by investigating and comparing the rates of volatilization of a series of twenty polymers. Similar differences were observed between linear and branched polypropyle…
The literature on the mineralogy and petrology of the scapolite family is reviewed. The general formula was examined in the light of 126 analyses from the literature, together with 9 new analyses. Of these 135 analyses, refractive indices were available for 64. Sixty-four of the analyses were rejected as unsatisfactor…
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Single crystals of PbTe have been heat-treated in evacuated silica tubes in the presence of Pb- or Te-rich ingots. At the heat-treatment temperatures, which ranged between 404° and 885°C, the ingot compositions were such that solid PbTe, liquid, and vapor phases coexisted. At a given temperature, the PbTe crystals wer…
Large area single crystals of Cu2O were grown by the process of high temperature annealing. Cu2O was prepared in finely polycrystalline form by the complete oxidation of Cu plate in air at temperatures of 1020°C to 1050°C. Subsequent annealing of the polycrystalline plates at higher temperatures allowed secondary recr…
Abstract Several polyamides crystallize from dilute glycerin solution as single crystals and spherulites possessing a lamellar structure. The crystal of nylon 6 are rhombohedral and thicken by spiral growth of lamellae from screw dislocations. Electron diffraction patterns indicate that the molecules are folded within…
Evaporated gold films in the 500–15 000 A thickness range were prepared on rocksalt substrates. Depending on the temperature of the substrate during deposition, the films were completely, partially, or randomly oriented with respect to the (100) plane of the rocksalt, as determined by x-ray diffraction. The stress-str…
A modification of an etch discovered by Lovell and Wernick has been shown to be a reliable means of revealing dislocations as etch pits on (111) faces of copper crystals. The etch has been employed to study dislocation distributions in as-grown, annealed, and deformed crystals. A high-temperature anneal is found to lo…
Abstract Dilatometers were used to measure the volume‐temperature curves of seven poly(4‐methyl‐1‐pentene) (PMP) samples between −30 and +270°C., and to measure crystallization rates on one sample between 220 and 236°C. A glass transition temperature of 18–29°C. was found, and the crystalline melting point was found t…
A cylindrical electrostatic electron selector is described which provides a 10 −7 ampere beam of electrons whose energy may be varied from 0 to 50 ev and whose energy spread is less than 100 mv. Space-charge problems involved in the construction of the device were overcome by the use of grids for focusing electrodes w…
Research Article| June 01 1960 The formation of fibrils from collagen solutions. 3. Effect of chondroitin sulphate and some other naturally occurring polyanions on the rate of formation G. C. Wood G. C. Wood 1Nuffield Gerontological Research Unit, Department of Medicine, University of Leeds Search for other works by t…