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This paper presents a full account of the crystal habits of chain-folded polyethylene crystals grown from dilute solutions, especially in xylene. All the growth procedures given are reproducible and have been used in the preparation of specific crystal habits discussed previously. An important innovation in technique…
Abstract Tensile stress‐induced crazing in polystyrene, poly(methyl methacrylate), and polycarbonate has been carefully examined by optical and electron microscopy. Examination of the surface of crazed specimens and the cross sections of individual crazes leads to the conclusion that the crazes are not void cracks, bu…
This paper describes measurements on transmission interference filters for the far infrared (100–800 μ region). The reflection layers of these filters are metallic mesh. The measured coefficients of finesse, ten to sixty, are comparable with the values which can be obtained for interference filters in other spectral r…
The use of exact reflection theory to interpret data allows the application of ellipsometry to the determination of the thicknesses and optical constants of surface films without the thickness limitations of approximate theory. Ellipsometer measurements as a function of the thicknesses and optical constants of a varie…
In experiments on diamond octahedra at temperatures of 1700 °C and above in high vacua, graphite has been observed to develop both internally and on the surfaces. The surface graphite that has been observed is different from that associated with etching, and is independent of the gaseous environment. Its development i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA Spin-Free Square Planar Cobaltous ComplexHarry B. Gray, Raymond. Williams, I. Bernal, and E. BilligCite this: J. Am. Chem. Soc. 1962, 84, 18, 3596–3597Publication Date (Print):September 1, 1962Publication History Published online1 May 2002Published inissue 1 September 1962…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation R. Wolfe, G. E. Smith; EFFECTS OF A MAGNETIC FIELD ON THE THERMOELECTRIC PROPERTIES OF A BISMUTH‐…
Abstract Es wird über die Darstellung ternärer Oxide des Niobs und Tantals vom Typ ABO 4 mit Fergusonit‐, Wolframit‐, Stiblotantalit‐ und Rutilstruktur berichtet. In der Fergusonitstruktur kristallisieren LaNbO 4 , YNbO 4 , sämtliche Niobate der Seltenen Erden, YTaO 4 sowie die Tantalate der Seltenen Erden von Nd–Er.…
Technical Briefs On the Singular Character of Thermal Stresses Near a Crack Tip G. C. Sih G. C. Sih Lehigh University, Bethlehem, Pa. Search for other works by this author on: This Site PubMed Google Scholar Author and Article Information G. C. Sih Lehigh University, Bethlehem, Pa. J. Appl. Mech. Sep 1962, 29(3): 587-…
The self-diffusion coefficient of aluminum has been determined in polycrystalline aluminum oxide over the range 1670° to 1905°C. Diffusion couples were employed using aluminum-26 in oxide form as a radioactive tracer. In the temperature range studied, experimental data can be represented by D = 28 exp {—[(114 000±15 0…
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It has been found, using thin film electron microscopy, that aluminium 3.5 and 7.3 atomic per cent magnesium alloys quenched into silicone oil contain concentric diamond-shaped dislocation loops lying upon the cube planes. An examination of the various dislocation interactions which occur together with the electron di…
Treating the glass temperature TG of polymers as an iso-free volume state allows one to derive the result (αL—αG). TG=K1, a constant; or the approximate result αLTG=K2, another constant. The α's are the coefficients of cubical expansion for 100% amorphous polymer above and below TG. K1 is 0.113 for a wide variety of p…
The relative turgidity technique consists in comparing the initial and turgid water contents, on a percentage basis, of disks punched from leaves, the turgid water content being obtained by floating the disks on water.