Constitution of Binary Alloys
Abstract not Available.
Materials Literature
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Application of Pulse Velocity Tests to Several Laboratory Studies in Materials
THE FUNCTION OF THE SONISCOPE IN ITS VARIOUS APPLICATIONS TO THE STUDY OF MATERIALS IS DISCUSSED. THREE LABORATORY INVESTIGATIONS ARE REVIEWED. FIRST, THE SONISCOPE WAS USED TO MEASURE THE SETTING TIME OF CONCRETE. FOUR CEMENTS (ASTM TYPES I, II, III AND IV) WERE USED TO MAKE CONCRETES OF A RATHER STIFF CONSISTENCY. V…
Criterion for Ferromagnetism from Observations of Magnetic Isotherms
A criterion is proposed for determining the onset of ferromagnetism in a material as its temperature is lowered from a region in which the linearity of its magnetic moment versus field isotherm gives an indication of paramagnetism. Within the limits of validity of a molecular field treatment, the Curie temperature is…
An experimental determination of the Fermi surface in copper
Abstract Measurements have been made of the variation with crystal orientation of the anomalous skin resistance of plane surfaces of pure copper at low temperatures and at a frequency of 22700 Mc/s. The resistance is related to the geometrical form of the Fermi surface, and a surface is determined which has the correc…
Heat Capacity and Heat of Adsorption of Argon Adsorbed on Graphon
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHeat Capacity and Heat of Adsorption of Argon Adsorbed on GraphonR. J. Bobka, R. E. Dininng, A. R. Siebert, and E. L. PaceCite this: J. Phys. Chem. 1957, 61, 12, 1646–1648Publication Date (Print):December 1, 1957Publication History Published online1 May 2002Published inissue…
Electron microscopic observation of periodic structures below 10 Å
(1957). Electron microscopic observation of periodic structures below 10 A. The Philosophical Magazine: A Journal of Theoretical Experimental and Applied Physics: Vol. 2, No. 24, pp. 1482-1484.
Mechanical Degradation and Cross Linking of Polymers by Plastic Deformation at High Pressure
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanical Degradation and Cross Linking of Polymers by Plastic Deformation at High PressureH. A. Larsen and H. G. DrickamerCite this: J. Phys. Chem. 1957, 61, 12, 1643–1646Publication Date (Print):December 1, 1957Publication History Published online1 May 2002Published iniss…
Magnetoresistance of Single Crystals of Copper
Measurements of the magnetoresistance coefficients at 4.2\ifmmode^\circ\else\textdegree\fi{} K and at 20.4\ifmmode^\circ\else\textdegree\fi{} K in single crystals of copper, silver, and gold in the low magnetic field range, and in single crystals of silver for high magnetic field are reported. The low-field results we…
Molecular orbital theory of reactivity in ionic polymerizations
Abstract The stabilization energy due to the conjugation taking place between a monomer and an ion in the transition state is calculated by the LCAO perturbation theory, in the same way in which the reactivity in radical copolymerization has previously been treated. In terms of this stabilization energy, the reactivit…
Lanthanum Rhodium and Lanthanum Cobalt Oxides
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLanthanum Rhodium and Lanthanum Cobalt OxidesAaron Wold, Benjamin Post, and Ephraim BanksCite this: J. Am. Chem. Soc. 1957, 79, 24, 6365–6366Publication Date (Print):December 1, 1957Publication History Published online1 May 2002Published inissue 1 December 1957https://pubs.a…
Structural behaviou of neutron irradiated quartz
X-ray and density studies have been made on single crystals of quartz irradiated with fast pile neutrons at approximately 100°C. The structural effects of the irradiation follow at least two processes with doses up to 1·2 × 1020 neutrons/cm2. Crystals irradiated with less than 3 × 1019 neutrons/cm2 expand anisotropica…
Experiments using a simple thermal comparator for measurement of thermal conductivity, surface roughness and thickness of foils or of surface deposits
The thermal comparator described consists of two metal balls similarly mounted in a block of balsa wood, but one is at a slightly lower level so that it touches any surface on which the block rests. After heating to a small fixed temperature excess the block is laid in contact with the test surface. Differentially con…
Paramagnetic Resonance in Trivalent Transition Metal Complexes
Paramagnetic-resonance absorption has been observed in complexes of acetylacetone with the trivalent transition metals titanium, chromium, iron, molybdenum, and ruthenium. The symmetry of the field perturbing the metal ion is predominantly axial. For the complexes of Ti+3 and of Ru+3, the axial potential is negative.…
Growth and Defect Structure of Sapphire Microcrystals
Examination of small euhedral crystals of α-Al2O3 (sapphire) that were observed following oxidation of aluminum and an aluminum alloy in wet hydrogen at high temperatures showed that growth probably occurs by decomposition of AlO on an Al2O3 surface. Rapid growth occurs on the tips of needles and the edges of platelet…
The molecular and crystal structure of cellulose triacetate
Abstract An x‐ray diffraction study has been made of cellulose triacetate II. Small films of highly crystalline triacetate with good fibrous orientation and a fair degree of biaxial orientation have been prepared by repeated rolling at successively higher temperatures between 160 and 215°C. The x‐ray diffraction patte…
Molecular distributions in polycondensations involving unlike reactants. I. Gelation
Abstract A general criterion for gelation in polycondensations having like groups of unequal reactivity has been formulated. In its simplest form, the criterion is that, for gelation, the expectation that a given structure will be propagated is unity, or greater. Several specific cases are treated, and literal express…
Electrical Properties of Epoxy Resins
Power factor, loss factor, dielectric constant, volume resistivity, surface resistance, and dielectric strength of epoxies, varying in viscosity and reactivity and cured with several types of hardeners, have been determined and form the basis for this report. The effect of cure, temperature, and frequency on electrica…
The Measurements of the Galvanomagnetic Tensors of Bismuth
The anisotoropy of the galvanomagnetic effects in the single crystals of pure bismuth was investigated at the temperatures between -160° and 45°C. The results were analysed by the phenomenological theory of the galvanomagnetic effects. Two components of the resistivity tensor, two components of the Hall tensor, eight…
Reaction of porous solids
Abstract A method is presented for the analysis of a reaction between a porous solid and a gaseous reactant where the kinetic expression is linear in the concentration and where appreciable concentration gradients are established in the pore system as a result of diffusive transport rate. Two cases are treated mathema…
Los ensayos de calidad en los laboratorios de fábricas
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