Materials Literature
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ABSTRACT Age measurements on glauconite by the K-Ar and Rb-Sr methods show a consistent variation with geological age with moderately small scatter. The results appear to fall 10-20 per cent short of ages measured on micas associated with dated igneous rocks. K-Ar and Rb-Sr age values are closely concordant in the maj…
The behavior of a permanent gas bubble in a liquid with an oscillating pressure field is analyzed with a linearized theory. If the assumption is made that conditions within the bubble are uniform, the thermodynamic relations found are as expected; i.e., at low frequencies the bubble behaves isothermally and at high fr…
Abstract A set of definitions is proposed to describe uniquely the six types of orientation possible in semicrystalline polymeric films. Oriented polymer films were studied by a new x‐ray diffraction technique which permits rotation of a sample about a number of independent axes yielding orientation distributions of t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUse of Tritium Tracer for the Determination of Hydrogen in AluminumA. S. GillespieCite this: Anal. Chem. 1960, 32, 12, 1624–1626Publication Date (Print):November 1, 1960Publication History Published online1 May 2002Published inissue 1 November 1960https://pubs.acs.org/doi/10…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew Tetrahedral Complexes of Nickel(II)F. Albert Cotton and David M. L. GoodgameCite this: J. Am. Chem. Soc. 1960, 82, 22, 5771–5774Publication Date (Print):November 1, 1960Publication History Published online1 May 2002Published inissue 1 November 1960https://pubs.acs.org/do…
The ultimate properties of amorphous rubbers at temperatures above Tg are considered in terms of stress-strain curves to rupture measured at different strain rates and temperatures. The consideration indicates that a specimen held at a fixed elongation should break eventually, provided the elongation exceeds a critica…
Normal perovskite-type barium titanate may be converted to the hexagonal polymorph by firing in a hydrogen atmosphere at 1330°C, 130° lower than that previously reported for firing in air. With suitable additives such as MnCO 3 the conversion begins at temperatures as low as 1100°C. Conversion is inhibited by a number…
Evidence is presented indicating that polyethylene crystals grow in the form of hollow pyramids as well as lamellar crystals. Modes of packing the folded molecules consistent with the nonplanar structure are proposed. Observed electron diffraction patterns and dark-field micrographs are related to the pyramidal morpho…
Antiferromagnetic domains in NiO have been studied by neutron diffraction and optical observation of single crystals. There are two kinds of antiferromagnetic domain walls, T (twin) and S (spin-rotation). A T wall is produced by rotation of the antiferromagnetic pattern of magnetic moments and an S wall by rotation of…
The statistical theory of the dielectric relaxation of polar liquids is developed using the fluctuation-dissipation approach to linear dissipative phenomena, and an expression is derived relating the complex dielectric constant to a time-dependent microscopic correlation function. It is found that a finite number of m…
The equation of state and the collision rate for systems ranging in size from four to 500 particles are described. The dependence of the results on the number of particles is qualitatively discussed and in this way insight is gained as to what is required of more accurate analytical theories. By comparing the results…
CONTENTSIntroductionChapter 1. Asymptotic methods of integrating partial differential equationsChapter 2. The imposition of boundary conditionsChapter 3. Eigenvalue problems in shell theoryChapter 4. Momentless shell theory and its connexion with the theory of infinitesimal deflectionsChapter 5. Asymptotic integration…
Arnold W Ravin; LINKED MUTATIONS BORNE BY DEOXYRIBONUCLEIC ACID CONTROLLING THE SYNTHESIS OF CAPSULAR POLYSACCHARIDE IN PNEUMOCOCCUSx, Genetics, Volume 45, Issu
Douglas F Brown, R Alexander Brink; PARAMUTAGENIC ACTION OF PARAMUTANT Rr AND Rg ALLELES IN MAIZE, Genetics, Volume 45, Issue 10, 25 October 1960, Pages 13
Abstract Some years ago the author proved that explicit formulae could be obtained for all the many-dimensional integrals occurring in variational solutions of Schrödinger’s many-electron equation for molecules if the expansion functions are constructed from factors of polynomials and radial Gaussian functions about a…
Abstract The friction coefficient μ and the mass loss M' per centimetre, of Al, Ag, Cu, Pt, Fe, Mo, U and W specimens ~ 1 to 2·5 cm long are investigated as a function of the mean particle diameter D of abrading emery-paper surfaces (dry) on which they slide at a few cm/s and ~1 Kg load. On any grade of abrasive, μ an…
The direct exchange integral which occurs in the Heisenberg theory of ferromagnetism is evaluated for all internuclear spacings. We find that it is always positive, whereas Bethe originally suggested it would be positive only at large spacing and more recently it has been suggested that the integral should always be n…
The electronic specific heat coefficient was measured in the temperature range 1.4\ifmmode^\circ\else\textdegree\fi{} to 4.2\ifmmode^\circ\else\textdegree\fi{}K for 48 solid solution alloys in the following binary systems: Ti-V, V-Cr, V-Fe, Cr-Mn, Cr-Fe, and Fe-Co. The electronic specific heat vs electron concentratio…
A thermodynamic theory is given of a class of magnetic crystals which transform from ferromagnetic to antiferromagnetic states as the temperature is varied. Applications are suggested to ${\mathrm{Mn}}_{2\ensuremath{-}x}{\mathrm{Cr}}_{x}\mathrm{Sb}$ and to crystals having the nickel arsenide type structure. It is show…
An irradiation capsule for high-temperature fuel irradiations has been developed to permit constant temperature control over a range of about ±35% of design power. Control is achieved by the variation in thermal conductivity of a binary gas mixture in a control annulus located between the test specimen and the capsule…