Materials Literature
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Methodology often used to estimate the consequences of postulated nuclear reactor accidents was applied in an analysis of the SL-1 reactor accident, which occurred in January 1961. The work focused on use of the CORRAL and CRAC computer codes to predict radionuclide leakage from the accident and resulting downwind env…
In an attempt to resolve the disagreement between previous theoretical calculations of the $2s$ partial photoionization cross section in neon, we have examined in detail the relative contribution from the initial-state configuration interaction and the final-state interchannel interaction. In addition, we have calcula…
Abstract Atactic and isotactic polystyrene powders were fractured with a ball mill at −196°C. The molecular weight distributions at various milling times measured by GPC show an initial asymmetric broadening and then a gradual returning to the original narrow bell‐shaped distribution. Analysis of molecular weight dist…
A family of modified-sulfur cements has been developed by the Bureau of Mines for the preparation of construction materials with improved properties. Various types of sulfur cements were prepared by reacting sulfur with mixtures of dicyclopentadiene (DCPD) and oligomers of cyclopentadiene (CPD). Durable cements were p…
The recent volcanic activities of Mt. St. Helens starting with a minor eruption on March 27, 1980, followed by major eruptions on May 18 and 25 and June 12, 1980, precipitated investigations of possible effects of volcanic ash fallout on the Pacific Northwest power system. This report discusses the pattern and impact…
Compressive and tensile creep were measured on UO 2 doped with 0.4 wt % niobia at controlled oxygen potentials. Kinetic results were almost identical, irrespective of the nature of the applied stress, but differences in after‐test microstructures were observed. Formation of “plastic” UO 2 with increases in strain rate…
Fhdeld‐assisted and ordinary diffusion ion exchange of K + , Rb + hd Cs + , and Ag + from nitrate salts with Na + in soda‐lime glass tubes were investigated between 700 and 735 K by application of various currents between 0 and 20.0 mA. An analysis of the field‐assisted process with both a forward and a reverse field…
Abstract The effects of β and γ radiation on the Nafion perfluorinated ion‐exchange polymer have been examined and the radiolysis products have been identified. The polymer degrades by simple chain scission, and the rate of degradation is not affected by the state of polymer hydration of the nature of the ion which oc…
Incommensurate-commensurate transition in {N(CD 3 ) 4 } 2 ZnCl 4 has been studied by simultaneous measurements of X-ray scattering and dielectric constant. The incommensurate satellite reflections are found at ( h 0 l ±ζ) with ζ=0.423 at room temperature. The dielectric constant along the a -axis drops discontinuously…
Journal Article Functional aspects of the integument in polypterid fishes Get access D. M. PEARSON D. M. PEARSON 1Department of Biological Sciences, University of Maiduguri, PMB 1069 Maiduguri, Nigeria Search for other works by this author on: Oxford Academic Google Scholar Zoological Journal of the Linnean Society, V…
Abstract The model proposed in this paper appears to give an adequate explanation for the magnitude of the blooming rates observed. The driving force is due to elastic stresses set up around the precipitated wax particles and thus the blooming rate is influenced quite strongly by the modulus of the rubber. On the basi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStereo- and regiochemistry of a palladium-catalyzed oxygen to carbon migrationBarry M. Trost and Thomas A. RungeCite this: J. Am. Chem. Soc. 1981, 103, 9, 2485–2487Publication Date (Print):May 1, 1981Publication History Published online1 May 2002Published inissue 1 May 1981h…
Theories for the blue phase proposed recently by Brazovskii and Dmitriev and by Hornreich and Shtrikman predict that this phase can exist only for cholesterics of sufficiently short pitch. In this article we demonstrate this dependence upon pitch through microscopic observations of three sets of binary mixtures, one s…
A review of reactor accidents and destructive tests shows that when water was present, only a very small fraction of the volatile fission product inventory (other than noble gases) was released to the environment. In addition, the iodine component was released over a period of days. However, in those situations where…
Magnetostriction constants h 1 and h 2 of Pd-Co alloys containing 5∼60 at%Co have been measured in the temperature range between 77 K and 300 K. The values of h 1 and h 2 at 0 K determined by the extrapolation increase in magnitude with increasing Co concentration, and reach the maxima of about -3.1 ×10 -4 and -2.9 ×1…
The formation of covalent C-C bonds or cross-links between the long chains in polyethylene (PE) by means of high energy irradiation was first deduced from changes in the stress-strain curves of the PE samples after irradiations in vacuo in the heavy water pile of the Argonne National Laboratory near Chicago in the aca…
Abstract Finite‐molecular‐mass homopolymers are modeled as binary random mixtures of high polymers and oligomers or chain ends, in proportions determined by the number‐average degree of polymerization. This leads directly to an entropic equation for the effect of molecular mass on T q in terms of the glass‐transition…
The formulae for the RMS scattering angle given by small-angle multiple-scattering theory are discussed and a correction to the standard Rossi formula is derived. Values of the correction factor are calculated for protons, alpha-particles and heavy ions; these results show that the correction is important for protons…
It is commonly assumed that the chemical form of fission product iodine that escapes from the core of a light water reactor under accident conditions is the elemental form. Experimental evidence is presented that indicates that this assumption is incorrect; instead, a metal iodide (probably cesium iodide) is the chemi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTESR spectra of nickel(II)-copper(II) and nickel(II)-cobalt(II) exchange-coupled pairs in transition-metal dinuclear triketonate complexesL. Banci, A. Bencini, C. Benelli, A. Dei, and D. GatteschiCite this: Inorg. Chem. 1981, 20, 5, 1399–1402Publication Date (Print):May 1, 19…