Materials Literature
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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…
Abstract 1. A simple NR compound has superior tack compared to an SBR stock because of its greater ability to flow under compressive load and its higher green strength. The difference becomes greater as surface roughness is increased or test rate decreased. Tack differences between the two stocks can be quantitatively…
The photoelectrochemical behavior of n‐type single crystal electrodes in acetonitrile solutions containing several redox couples ( , , , thianthrene 0/+ , was investigated. Electrodes with discontinuities in the van der Waals' surface show large dark currents and recombination of electrons with photo‐oxidized solution…
By means of X-ray diffraction study, an incommensurate phase of {N(CH 3 ) 4 } 2 MnCl 4 was found in the temperature range of 19.1 ∼18.5^° C . Incommensurate satellite reflections were observed at ( h 0 l ±ζ) with ζ≃0.483. In the temperature range of 18.5 ∼-6.5^° C , the value of ζ is \(\frac{1}{2}\) (commensurate). Th…
Hydrogen induced damage to carbon and low alloy steels can occur in the absence (HIC), or more frequently, in the presence of external stresses (HSCC). A great variety of pipeline steels was investigated to compare the resistance against HIC and HSCC at different pH values in H2S containing environments. The response…
By mixing of potentially-mesomorphic electron donors and acceptors of the type N-(p-X-benzylidene)-p-Y-aniline, nematic and smectic liquid crystals could be induced. In the present work, the donor molecules with a dimethylamino group as X or Y and the acceptor molecule with a nitro group as X or Y were employed. The r…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExcluded-volume effects in dilute polymer solutions. 11. Tests of the two-parameter theory for radius of gyration and intrinsic viscosityY. Miyaki and H. FujitaCite this: Macromolecules 1981, 14, 3, 742–746Publication Date (Print):May 1, 1981Publication History Published onl…