Materials Literature
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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…
The photoelectrochemical behavior of p‐type WSe 2 single crystal electrodes in acetonitrile solutions containing a number of redox couples [ e.g. , N,N,N′,N′‐tetramethyl‐p‐phenylene diamine (+ 1/0), methyl viologen (+ 2/+1), nitrobenzene (0/−1), phthalonitrile (0/−1)] was investigated. For couples with potentials in t…
Abstract Early work with commercial‐grade limestones containing small quantities of MgCO 3 (2–10%) demonstrated that exchangeable Mg was reduced as the soil pH was increased in several soils. An incubation experiment was conducted to more precisely determine the extent of the Mg “fixation” and to evaluate several hypo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAcylation of multiple anions of poly-.beta.-ketones by hydroxy- and alkoxybenzoates. Cyclization of the resultant tetraketones to benzophenones and xanthonesRonda M. Sandifer, Ajit K. Bhattacharya, and Thomas M. HarrisCite this: J. Org. Chem. 1981, 46, 11, 2260–2267Publicati…
The molecular and macroscopic changes occurring during the polymerization of poly(methyl methacrylate) (PMMA) bone cement have been investigated. Electron paramagnetic resonance (EPR) spectroscopy was used to monitor free-radical generation and this was compared to temperature changes occurring in the cement for vario…
The antiferromagnetic S-domain structure of a NiO single k-domain platclet has been investigated by neutron magnetic diffraction topography. From the images obtained, it is possible to rule out ⟨110⟩ as the antiferromagnetic direction, and to infer that magnetic moments are along a direction close to ⟨112⟩. It is then…