Materials Literature
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Summary The crystal structure of killalaite has been approximately determined, using a crystal from the original locality. The ionic constitution is Ca 3+ x (H 1–2 x Si 2 O 7 ) (OH), with x ≈ 0·2 for the crystal studied. Crystal data are: monoclinic pseudo cell with a 6·807, b 15·459, c 6·811 Å, β 97·76°, space group…
Thermal annealing characteristics of the glow peaks from 200 to 650 degrees c in Al2O3 thermoluminescent (TL) phosphor have been studied. All the glow peaks show exponential decay and follow first-order kinetics. The trap depths and frequency factors for the glow peaks have been determined from their isothermal decay…
A new and improved gas distributor was developed for use in coating fuel particles for the high-temperature gas-cooled reactor. The coating gas enters the coating furnace through multiple thin regions of a porous plate. This more uniformly disperses the gas and leads to improved coating properties. High-quality carbon…
The silicon carbide (SiC) layer in Triso-coated high-temperature reactor fuel particles is occasionally attacked during irradiation by fission products generated within the kernel material. Investigations to define the cause of the SiC corrosion included ceramographic, microradiographic, and microanalytical studies on…
This paper describes the factors influencing the voltage or electric stress-failure time relation of cast and molded resins. It also discusses the reasons for similar failure times at equal stresses with surface and internal discharges, when the discharges are continuous, and presents data supporting those reasons. Th…
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…