Materials Literature
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ABSTRACT Light and scanning electron microscopy were utilized to quality diatom colonization in Oak Creek, Arizona. Aluminum SEM stubs with and without plexiglass discs were anchored into rocks. Early colonization on five stub microzones was examined at hourly intervals; weekly intervals of up to 3 wk were employed to…
The adhesion of two Staphylococcus epidermidis strains and one Staphylococcus saprophyticus strain on to poly(tetrafluorethylene-co-hexafluorpropylene) (FEP)-fluorocarbon and cellulose acetate was studied in vitro. Both S. epidermidis strains showed a more hydrophobic character than the encapsulated S. saprophyticus a…
Uranium dioxide fuel with initial grain sizes from 8 to 80 μm was irradiated at linear ratings of 50 to 65 kW/m to a maximum burnup of 230 MW*h/kg U (10000 MW.d/metric ton U). At a linear power of 50 kW/m, where grain growth is not significant, a large initial grain size reduced fission gas release; above 50 kW/m, the…
Wyckoff positions of centrosymmetric symmorphic space groups, if properly interpreted, can be used to derive the Bravais classes of modulated crystals. This program is worked out here for the incommensurate case and assuming that the modulation wave vectors are symmetry related, i.e. are (integral combinations of) vec…
Water uptakes in sorption experiments on thin sheets of epoxy resins have been explained on the basis of theoretical models. The occurrence of an irreversible void formation process at higher humidities induces strong deviations from the Flory–Huggins analysis. This phenomenon can be successfully explained on the basi…
Electromagnetic-structure-resonance enhancement of scattering from Si phonon modes is reported for a number of submicrometer structures. Enhancements of greater, similar100 over the Raman intensity from bulk Si are observed for ~0.1-microm-diameter Si spheres. An analytic calculation of the Raman intensity for this ge…
The application of stress cycling to 1% manganese steel at low magnetic fields causes an irreversible shift in the magnetization towards the anhysteretic due to domain walls breaking away from their pinning sites under stress. The change in flux density ΔB caused by a single stress cycle of fixed amplitude\sigma_{\max…
Anchorage-dependent fibroblasts can be cultured by using as a substrate the protein layer that spontaneously forms at the liquid-liquid interface between fluorocarbon fluids and tissue culture medium. For this novel substrate to be effective in supporting confluent cell layers, the protein monolayer must support the s…
High resolution electron microscopy of a set of Sm(Co.725Fe.20Cu.055Zr.02)7.5magnets has been used to characterize the structure and the size of the various micro-phases present. Our investigations of the samples, which were sintered at 1215°C, subsequently isothermally aged in steps of 50° at temperatures between 700…
Abstract The elastic constants of the lamellar compounds Gas, GaSe, InSe are measured on several samples using an ultrasonic method, and the results are compared with previous publications. The variations of C 33 , C 11 , and C 66 with an hydrostatic pressure are measured up to 3 kbars. In the range of pressure studie…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIntramolecular excimer emission of poly(N-vinylcarbazole) and rac- and meso-2,4-di-N-carbazolylpentane. Model substances for its syndiotactic and isotactic dyadsF. Evers, K. Kobs, R. Memming, and D. R. TerrellCite this: J. Am. Chem. Soc. 1983, 105, 19, 5988–5995Publication D…
Abstract Exchange isotherms were prepared for Na + in Na + →Ca 2+ and Na + →Mg 2+ exchange reactions, and for Mg 2+ in Na + →Mg 2+ exchange reactions, at 298 K on Wyoming bentonite suspended in a 0.05 M perchlorate background. These isotherms were essentially congruent with the appropriate thermodynamic nonpreference…
Following a review of statistical models of the failure of single fibers and bundles of these fibers, algebraic recurrence formulas are derived that generate expressions for the failure probabilities of bundles of classical fibers. One of these recurrence relations is suitable for the accurate numerical calculation of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComparative study of the electrode reactions of 12-molybdosilicate and 12-molybdophosphateKei Unoura and Nobuyuki TanakaCite this: Inorg. Chem. 1983, 22, 20, 2963–2964Publication Date (Print):September 1, 1983Publication History Published online1 May 2002Published inissue 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTViscoelastic behavior of atactic polypropyleneDaniel L. Plazek and Donald J. PlazekCite this: Macromolecules 1983, 16, 9, 1469–1475Publication Date (Print):September 1, 1983Publication History Published online1 May 2002Published inissue 1 September 1983https://pubs.acs.org/d…
Abstract Three principal modes of formation are apparent for authigenic smectites in Recent marine sediments: alteration of volcanic rocks and glass, low-temperature combination of biogenic silica and Fe-oxyhydroxides, and direct precipitation from hydrothermal fluids. The latter two mechanisms are discussed with refe…
Abstract Rubber vulcanizates can be reclaimed by milling them with curing ingredients. Physical properties of the RR vulcanizates are inferior to those of the control vulcanizate. RR compounds exhibit poor processing characteristics. Poor physical properties and processing characteristics can be improved by blending w…
The thermal decomposition of poly(ethylene terephthalate) has been studied using a conventional dynamic thermogravimetric technique in a flowing air atmosphere at several heating rates between 0.1°C and 100°C/min. The dynamic thermogravimetric analysis curve and its derivative have been analyzed using a variety of ana…
The x-ray-induced ‘‘blue’’ emission from commercially available, high-quality synthetic quartz has been studied between 80 and 300 K. Three overlapping bands, each having a different quenching temperature, have been experimentally resolved in the as-grown crystals. These bands peak at 440, 425, and 380 nm; their half-…
Abstract The LO‐phonon—plasmon coupling in n‐ZnO single crystals is investigated by Raman spectroscopy at room and liquid nitrogen temperatures. The energy shift and halfwidth broadening of the LO‐phonons relative to the uncoupled modes are analyzed to get the concentration and mobility of the charge carriers. These r…