Materials Literature
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The synergism between hydrogen embrittlement and temper embrittlement has been investigated in a 9Cr–1Mo martensitic steel. Measurements of tensile ductility were used to monitor the development of embrittlement with increasing hydrogen content in material as tempered and aged for up to 5000 h at 500 or 550°C. A detai…
Relationships among the apical pore jeld-bearing diatom genera Brebissonia, Cymbella, Gomphonema, Gomphoneis, Didymosphenia, Gomphocymbella, and Reimeria and their close ally Encyonema were evaluated using cladistics.These biraphid genera are a polythetic group dejned by chloroplast number and type, mode of sexual rep…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface plasmon polariton enhancement of Raman scattering in a Kretschmann geometryJ. Giergiel, C. E. Reed, J. C. Hemminger, and S. UshiodaCite this: J. Phys. Chem. 1988, 92, 19, 5357–5365Publication Date (Print):September 1, 1988Publication History Published online1 May 200…
Analytical results are obtained for mobility functions which describe the hydrodynamic interactions between two unequal viscous drops. It is assumed that the surface tension is sufficiently high so that the drops retain a spherical shape. Exact solutions are introduced for the velocity images for Stokeslets and higher…
The selective pretilting of the C-directors at the bounding surfaces, which causes characteristic disclination loops during the switching process, has been ascribed to the chevron structure of smectic layers. A zig-zag defect is the boundary between the two possible layer bend directions. By applying an electric field…
The values of buildup factors for a specific energy above K edges and penetration distance vary smoothly with respect to atomic number. An interpolation of buildup factors for an arbitrary elemental material is examined using geometric-progression (G-P) parameters for an equivalent atomic number. The G-P parameters ar…
Abstract Blends of bisphenol‐ A polycarbonate (PC) with poly‐ (styrene‐co‐acrylonitrile) (SAN) and poly (acrylonitrile‐butadiene‐styrene) (ABS) prepared by screw extrusion and solution‐casting were investigated by differential scanning calorimetry and scanning electron microscopy. From the measured glass‐transition te…
Symmetrical and cyclic alkyl trithiocarbonates were synthesized by reacting CS2 and 33% aqueous NaOH with alkyl hal-ides under phase transfer catalysis conditions
Lead metaphosphate glass is characteristically prone to aqueous attack but becomes chemically resistant on the addition of iron oxide. We have measured the K-edge extended X-ray absorption fine structure (EXAFS) of Fe and the LIII-edge EXAFS of Pb and find the atomic environments of the two sites to be very different.…
The corrosion potential of stressed sensitized Type 304 stainless steel has been studied in solutions containing oxygen to determine the relation between potential fluctuations and the initiation of stress corrosion cracking. An in situ scanning vibrating electrode technique was shown to detect currents coming from gr…
In this paper, A new class of corrosion inhibitors for steel in strong HCl is described. When formulated with small amounts of surfactants, α-Alkenylphenones provide excellent protection for oilfield steel in contact with strong HCl (up to 28%). The protection levels are similar to, and sometimes superior to, those pr…
Abstract Odinite is a Fe 3+ -rich green clay that is widespread in the form of infillings or replacements of microtests, bioclasts, faecal pellets, or mineral debris on shallow marine shelfs and reef lagoonal areas in tropical latitudes. The structure is based on a 1 : 1 serpentine-type layer that is intermediate betw…
The general corrosion behavior of , Metglass 2826A, was assessed as a function of heat‐treatment and surface finish by cyclic potentiodynamic anodic polarization. The general corrosion resistance of Metglass 2826A decreased in this order: supersaturated solid solution (SS) anneal, polished, as‐received, subcritical an…
The feasibility of a permeation process using a palladium-silver alloy membrane, to separate deuterium and tritium from fusion reactor gaseous wastes needs demonstration owing to poisoning effects of impurities. A parametric investigation of the poisoning by the most important expected gaseous impurities (CO, CO2 and…
The dynamical behavior of the unstable explosive boiling of single droplets (1–2 mm diam) of diethyl ether, pentane, and isopentane at the superheat limit has been exhibited in detail. A+high ambient pressures, boiling consists of normal stable growth of a smooth bubble. At intermediate pressures a transitional regime…
Abstract The (02,11) X-ray diffraction band from a low-defect kaolinite from Cornwall (Hinckley index HI = 1·22) was examined to determine the defect structure. No combination of interlayer translations and admixing of dickite layers accurately modelled the observed diffraction pattern. Calculated diffraction patterns…
Magnetic properties were investigated for the ternary (Fe0.6Pt0.4)100−xBx and (Fe1−yPty)83B17 alloy ribbons prepared by the twin roll technique. Boron changes the compositions of the ordered FePt (γ1) phase, which coexists with Fe2B at various alloy compositions so that the actual Pt content of γ1 in the ternary alloy…
The effects of temperature, interface pH, and magnesium ions on the formation of calcareous deposits induced by cathodic protection (CP) on steel have been studied in seawater and in three 0.7 M NaCl + 0.0025 M NaHCO3 solutions. The interface pH at a given CP potential was calculated to be higher at low temperature, t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAtmospheric chemistry of aldehydes: enhanced peroxyacetyl nitrate formation from ethanol-fueled vehicular emissionsRoger L. Tanner, Antonio H. Miguel, Jailson B. De Andrade, Jeffrey S. Gaffney, and Gerald E. StreitCite this: Environ. Sci. Technol. 1988, 22, 9, 1026–1034Publi…
The electrical V-I characteristics of thin blown films of V2O5-Bi2O3 glasses with 95–70 mol % V2O5 were studied in the temperature range 200–400 K. It was observed that at lower fields, the bulk resistance controlled the current. At higher fields, all the glass compositions showed memory switching characteristics. The…