Materials Literature
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Abstract It is well known that the polyisoprene of hevea latex undergoes considerable changes after its emergence from the tree. These changes take the form of chain scission or crosslinking depending on the conditions obtaining (see all References). In the solid state the predominant reaction that takes place on stor…
It is shown that the inhomogeneous demagnetizing field occurring in uniformly magnetized, nonellipsoidal samples can be described by a generalized demagnetizing factor. The demagnetizing factor is a tensor and, in general, is different in different parts of the sample. The diagonal sum of this tensor field is unity at…
The crystal structure of dehydrated Ca-chabazite (composition Cal.95A13.gSis.lO2~ ) was determined from the [001] projection of the rhombohedral cell (R'3m: a = 9.37 A, a = 92 01'). Each corner of the rhombohedral cell is occupied by a ditrigonal prism of twelve linked tetrahedra with an Si, A1-O tetrahedron lying at…
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 W. A. Yager, Edel Wasserman, R. M. R. Cramer; ESR Observation of Δm=1 Transitions of Triplet Stat…
Strain-hardening caused by ``debris'' produced by multiple cross-glide is discussed. This form of strain-hardening is often linearly proportional to strain, because the debris concentration increases in proportion to strain. The rate of debris production should be sensitive to the applied stress, crystal structure, an…
Crystals of MgSO4.4 tt~O and FeSO4.4 H20 have the lattice parameters a=5.922, b=I3.604, c=7.90~ A, fl=9051" and a=5.979, b=13-64 s, c=7.97~ A, fl=90 26', space group P21/n. The structures have been determined by two-dimensional Fourier and (Fo-t%) syntheses. Isolated Me2(SO4) 2 . 8 H20 rings are linked by hydrogen bon…
Abstract Meridional reflections appearing in small‐angle X‐ray diffraction diagrams of drawn polyethylene are caused by a nearly periodic arrangement of crystalline and disordered regions. The long period, which is determined by the average distance between two consecutive crystallites, depends on the method of prepar…
Investigation of distribution and magnitudes of boundary shear stresses in curved reaches of smooth trapezoidal channels under conditions of subcritical flow; tests conducted to determine effects of variation in discharge and bend geometry on shear pattern; flows through channel curves were studied and local shear str…
Crystalline slip has been observed in singly and doubly oriented nylon 66 and 610 by deformation of bristles in compression parallel to their orientation direction to form kink bands. The angles of the bands correspond to two and three (010) planes acting in unison as lamella in the kinking process. Slip was also mani…
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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