Materials Literature
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The x-ray coloration of synthetic calcium fluorophosphate (fluorapatite) crystals is shown to result from the presence of fluorine vacancy defects. Three of these defects have been studied by correlating their optical absorption bands with their electron-paramagnetic-resonance spectra, and by application of the electr…
New name for polypropylene film. ICI's balanced biaxially oriented polypropylene film is now being sold under the trade name Propafilm . This move emphasises the established position of this material for packaging by distinguishing the product from ICI propylene polymers and copolymers, which are sold under the trade…
In connection with a program to study the behavior of punctured fuel elements for the Tokai Atomic Power Reactor, the diffusion coefficient of fission gas in uranium oxide powder formed by CO2 oxidation of U was determined by post-irradiation experiment, in which the fractional release of fission gas during isothermal…
The lanthanum-aluminium system is found to contain six intermediate phases: LaaAI (hexagonal MgaCd type), LaAI (orthorhombic CeAI type), LaAh (cubic MgCU2 type), Lao.eaale.re (hexagonal AIB2 type) and LaAla (hexagonal MgaCd type); LaAl4 is orthorhombic at room temperature but is transformed into a tetragonal modificat…
The elastic behavior of plain and double knit fabrics was studied before and after laundering. Thirty-four fabrics were knit of 24/1, 20/1, and 16/1 cotton yarns. Elonga tion, recovery, and growth were determined by a manual method and by the Instron machine set at predetermined extension. Also, elongation and growth…
Summary A hydrated barium pyrochlore (pandaite) has been found at Mrima Hill (Kenya) in a residuum consisting mainly of goethite/limonite and gorceixite. The pandaite occurs as pale yellow or white octahedral crystals, which have a micro-crystalline interior. It is isotropic, the refractive index varies from 2·07 to 2…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure Property Relationships in Polyurethane Elastomers Prepared by One-Step ReactionK. W. Rausch Jr. and A. A. R. SayighCite this: Ind. Eng. Chem. Prod. Res. Dev. 1965, 4, 2, 92–98Publication Date (Print):June 1, 1965Publication History Published online1 May 2002Publish…
The room temperature luminescence spectra of the monoterpyridyl chelates of trivalent samarium, dysprosium and thulium have been studied in solid state by exciting with monochromatic radiation of 3200 Å. The spectra of these chelates show intra f → f fluorescent transitions of the chelated rare earth ions as well as t…
Abstract The effect of ozone on the growth of cuts in rubber strips subjected to repeated tensile deformations has been investigated. At tearing energies below a critical value ozone accounts for all the cut growth, and in this region the rate of growth also occurs due to mechanico‐oxidative rupture, the rate of this…
Abstract Thirteen dimensional parameters are suggested as necessary to describe a sedimentary particle, and a range of form indices is derived from these. The behavior of a particle depends on each form index which defines the particle and a general correlation can only be obtained by examining the performance versus…
The utility of ferrite cores which have the Curie temperature in the vicinity of the room temperature and suddenly change the permeability vs. temperature characteristic near the Curie temperature is described in this paper. Using the characteristics of these ferrite cores, the author made an overcurrent relay and a l…
SUMMARY The following marine chrysomonads, originally described by Carter, are redescribed: Pseudopedinella pyriforme, Ochromonas oblonga, and Pyrmnesium parvum. Parachrysiclalis n.g. is set up for P. estuariale, with a flattened body and 2 equal flagella inserted in the middle of one side. Redescribed Xanthophy‐cean…
Abstract The ordinary methods for obtaining a rapid estimate of the useful life of a plastic, extrapolations from tests conducted at higher temperatures or at lower stabilizer concentrations than those of actual use, lead to serious errors in estimating the useful life of some stabilized polypropylene compositions. Tw…
Plate-like crystals of BaTio 3 , 20 to 140 µ thick, were treated thermally in order to create conditions for the establishment of an equilibruium 180° domain structure corresponding to minimum electrostatic and wall energy. It has been found that with slow cooling of the crystals from the paraelectric phase in a mediu…
Abstract Model substances were prepared of a polyurethane rubber filled with different amounts of various fractions of sodium chloride. Eight filler fractions were used of sizes in the range of 1–480 μm. The amount of filler was varied between 0 and 50 vol.‐%. An experimental method is described by which thermal expan…
Electron optical technique has been used to study the mechanism of the polymorphic transformation in KAlSi3O8. This transition involves a reduction in symmetry from monoclinic (C2/m) to triclinic (CI) with falling temperature and is associated with ordering of the aluminium–silicon distribution on tetrahedrally coordi…
Measurements have been made between 2 and 30°K of the linear thermal expansion of single crystals of Mg, Zn and Cd, both parallel (⌋) and normal (Ι) to the hexad axis. Values have also been obtained at liquid oxygen temperatures and at room temperature which agree with previous data. (i) For Mg, the linear coefficient…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMetal Acetylacetonate Catalyzed Epoxidation of Olefins with t-Butyl HydroperoxideNorman IndictorCite this: J. Org. Chem. 1965, 30, 6, 2074–2075Publication Date (Print):June 1, 1965Publication History Published online1 May 2002Published inissue 1 June 1965https://pubs.acs.org…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Crystal Structure and Molecular Stereochemistry of Methoxyiron (III) Mesoporphyrin-IX Dimethyl Ester1J. L. Hoard, M. J. Hamor, T. A. Hamor, and W. S. CaugheyCite this: J. Am. Chem. Soc. 1965, 87, 11, 2312–2319Publication Date (Print):June 1, 1965Publication History Publi…
An unusual form of kaolin mineral filling cracks in weathered prophyritic granite in the county of Piedade, Sao Paulo, Brazil, consists of visibly fibrous material which, in the electron microscope, appears as thin tubular fibers of considerable length; platy particles are almost entirely absent. X-ray rotation diagra…