Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
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…
Abstract The graft copolymerization of acrylate monomers, methyl, ethyl, n ‐propyl, and n ‐ or isobutyl, in cotton fabrics was carried out in the aqueous emulsion system by the ceric ion method. The rate of grafting decreases with increasing length of the ester group. The maximum improvement of dry crease recovery, th…
A simple apparatus and special techniques are described which have been used to purify and to grow single crystals of KCl and KBr. The measured inpurity content of such crystals is lower than that of commonly used, commercially available crystals by a large factor. Residual impurities have fractional concentrations, i…
In the system alkali-oxide-transuranium-oxide-oxygen, ternary oxides containing hexavalent transuranium elements were prepared by reactions in the solid state. Depending on reaction conditions, the following compounds were obtained: Na2Np2O7, α-Na2NpO4, Li4XO5(X Np, Pu, Am), α-Na4XO5(X U, Np, Pu, Am), β-Na4XO5(X …
Abstract The possibility is considered that clay minerals can influence the formation of some kinds of dolomite, either by supplying magnesium ions or serving as membranes that control ionic migration.
Expressions may be derived for the thermal expansion coefficient of polycrystalline graphite in terms of the single-crystal coefficients and the preferred orientation of the sample. Thermal expansion and preferred orientation measurements were performed on pyrolytic, molded, hot-worked, extruded-rod, and extruded-tube…
A numerical calculation of the Peierls stress and energy in the Frenkel—Kontorova dislocation model is reported. The calculated stresses are compared with the theoretical predictions of V. L. Indenbom that they decrease exponentially and I. M. Lifshitz that they decrease as the inverse fifth power with dislocation wid…
KOZO HAMAGUCHI, HIROKO SAKAI; Structure of Lysozyme: IX. The Effect of Temperature on the Conformation of Lysozyme*, The Journal of Biochemistry, Volume 57
The area of glass formation in the system GeO 2 ‐P 4 O 10 ‐V 2 O 5 and the properties of the glasses in this area were determined. The glasses displayed electronic conduction at room temperature (25°C). Resistivity ranged from 500 ohm‐cm to 10 9 ohm‐cm at 25°C. Some of the glasses had unusual negative temperature coef…
It is shown that a more natural description of the forces on a dislocation is obtained if in the Peach–Koehler equation all the stresses are replaced by the deviator stresses.
Dislocation loops containing stacking faults have been observed in quenched aluminium using the electron microscope. It is found that lowering the quenching rate relaxes the stringent purity conditions governing the retention of faulted loops, such that a high proportion of the loops in oil-quenched aluminium (99·97 %…
Abstract A stream of atomic oxygen, produced by passing oxygen at low pressure through a radio‐frequency coil, was allowed to impinge on films prepared from several dozen different polymers. The flow of oxygen radicals was regulated so that the reaction temperatures were between 40 and 70°C. The rapid reactions which…