Materials Literature
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An attempt is made to analyze the factors which determine the operation of the bubble chamber. It is concluded that the majority of bubbles in conventional chambers are nucleated by moderately energetic free electrons produced by the incident particles in Coulomb encounters. Nuclei are displaced too infrequently by Co…
Abstract Sorption and diffusion of C 4 and C 5 hydrocarbons have been studied in thin films of ethyl cellulose in the temperature range 30 to 80°C. Only regions of low penetrant concentration were chosen in order to minimize hysteresis effects associated with slow relaxation of polymer chains. The data have been quant…
Silicon is electropolished in hydrofluoric acid solutions if a critical current density is exceeded. Below the critical c.d., silicon dissolution is largely divalent, and a thick solid layer forms. This film is unstable and reacts slowly with the electrolyte to form tetravalent silicon and hydrogen gas. In the electro…
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SynopsisAll the important questions in counting phytoplankton are reviewed. The methods described refer primarily to fresh water but are applicable to marine phytoplankton as well. No attempt has been made to review the whole of the voluminous literature on counting technique or describe its development. The main aim…
Abstract not Available.
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…
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…
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…
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…
(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.
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…
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…
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…
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…
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…
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 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.…
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…
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…