Materials Literature
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An investigation was made to examine the influence of Mn and S levels up to 0.65 and 0.02 wt%, respectively, on the magnetic properties and texture of non-oriented low carbon steels. The results indicate that at a particular sulfur level, the 15 kG core loss decreases linearly with Mn concentration at an estimated rat…
The chemical and thermal-mechanical stability of sputtered aluminum oxide films are examined. Sputtered alumina is quite soluble in bases and phosphate-containing solutions. Carbon dioxide was detected in the films by infrared spectroscopy and by mass spectroscopy during thermal gravimetric analysis; the presence of C…
This paper describes a study of the absorptance of thin films with the aim of elucidating the region of validity for a direct relationship between the absorptance and the absorption coefficient. The calculations are performed for an unsupported film, a film on a transparent or metallic substrate, and for the absorptan…
SUMMARYThe phragmosporous genera Magnaporthe and Telimenella are placed in the Physosporellaceae. Ceratosphaeria grisea is transferred to Magnaporthe and Telimenella phacidioidea is newly described. The differences between Hyponectria and Physalospora, both amerosporous genera of the family, are clarified. The species…
A Fresnel zone plate of variable size can be formed as a moiré pattern between a suitable pair of identical grids. The focusing power may be varied over a considerable range by relative translation of the grids if their line sbapejs are determined by a combination of cubic and linear functions. Elliptical and hyperbol…
The simulation of section topographs of distorted crystals may be performed with good accuracy; it is now possible to use it as a tool to determine the quantitative parameters of various defects. The simulation of traverse topographs is a more complicated problem: it needs a tremendous amount of computation time, but…
Abstract Primary textural features in dolostones and recrystallized limestones are difficult to see under the petrographic microscope. A simple light diffuser, placed directly under the petrographic thin section, helps delineate primary features in cases where textural "ghosts" occur as insoluble residues. Best result…
The coating of nuclear fuel particles with pyrolytic carbon derived from a hydrocarbon gas is a complex process, and, until recently, although adequate behavior in service has been demonstrated, the methods used to obtain a particular product have been largely empirical. A concerted effort was made to close the loop:…
Thalassiosira fluviatilis Hustedt and T. pseudonana Hasle et Heimdal have been found to be widespread in both large and small rivers, while a third taxon, apparently new, has been recorded several times. The appearance of the frustules by light and electron microscopy is commented upon and illustrated, and some of the…
Abstract Electron microscope image analysis of carbon blacks in specific rubber compounds has greatly expanded the range of useful applications for studies of this type. This dispersed carbon-gel procedure has improved the sampling and test precision at operating speeds that are now reasonably comparable to the simple…
By using an electron-energy analyzer adapted on a high-voltage electron microscope, energy-loss straggling of relativistic electrons (0.3-1.2 MeV) through 1- to 8.5-\ensuremath{\mu}m-thick aluminum foils has been investigated in the energy range 0-4000 eV. The energy resolution of the analysis is 3 eV. The experimenta…
The experimentally determined quantitative effects of varying gas mixture composition on the properties of the zirconium carbide (ZrC) deposited on microspheres in a fluidized bed were a decrease in metallic appearance of the ZrC coat, with an increase in the ratio of the hydrocarbon gas to the ZrCl4 and co-deposition…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA new molybdoarsonate. Structure of (PhAs)2Mo6O25H24- and solution interconversion of heteropoly anions that differ by a constitutional water moleculeWonsuk Kwak, Ljudmila M. Rajkovic, Michael T. Pope, Carl O. Quicksall, Kazuko Y. Matsumoto, and Yukiyoshi SasakiCite this: J.…
Abstract The thermal and electron impact induced degradation reactions of poly(ε‐caprolactone) {poly[oxy(1‐oxohexamethylene)]} were investigated in a mass spectrometer. It can be shown that the favorated thermal degradation reaction is the cleavage of the ester bond and formation of ω‐hydroxyl and ketene endgroups (Eq…
The data extracted from numerous irradiation tests were used to derive amoeba endurance parameters for UO2.The data do not yet allow an unambiguous definition of the controlling mechanism, which may be due to either gaseous or solid-state diffusion processes. Adequate data on the amoeba effect are available for design…
Abstract A differential scanning calorimeter (DSC) was used to study the melting behavior of drawn nylon 6 yarns which were prevented from shrinking during heating. The DSC curves exhibit a single melting peak at a higher temperature instead of the double peaks which, as reported previously, were observed in the uncon…
Abstract The glass transition, crystallization, and α–β transition of the Tussah silk fibroin were studied by means of DSC (differential scanning calorimetry) and infrared spectroscopy. The endothermic shift due to the glass transition was observed at 162°C. The endothermic peak at 220°C was attributed to the α–β conf…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and characterization of the skutterudite-related phases CoGe1.5S1.5 and CoGe1.5Se1.5R. Korenstein, S. Soled, A. Wold, and G. CollinCite this: Inorg. Chem. 1977, 16, 9, 2344–2346Publication Date (Print):September 1, 1977Publication History Published online1 May 20…
The crystal structure of a bismuth titanate, Bi7Ti4NbO21, was determined on the basis of super-high- resolution images, taken by a recently constructed 1000 kV electron microscope, in which each cation site was approximately defined. It was found that the crystal has a mixed-layer structure, i.e. Bi4Ti3O12 and Bi3TiNb…
Collagen fibrils provide a biological example of smectic A liquid crystals. They demonstrate spiralling of their constituent chiral molecules, about the normal to their layers, when they undergo a transition to smectic C. Under tension, perpendicular to the planes of the layers, their molecules are tilted and some of…