Materials Literature
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Summary Concentrations of dialysable silica in equilibrium with Al 2 O 3 ‐SiO 2 ‐H 2 O sols at pH 4.5–5.0 confirm the formation of a poorly ordered non‐dialysable proto‐imogolite species with an Al : Si ratio near 2, close to that of imogolite. Sols with Al : Si>2 give nearly constant levels of free silica in solut…
Summary Strontium sulfate scale in the Fateh field results from mixing incompatible waters. Precipitation squeezes with phosphonate scale inhibitors were shown to be effective in laboratory studies and field use of precipitation squeezes confirmed this. Continued use has resulted in additional operating and performanc…
Magnetisation in the Pd2MnSn Heusler alloy was observed to be drastically reduced by plastic deformation. The reduction is able to be explained in terms of the dislocation theory with the consideration of ferromagnetic and antiferromagnetic Mn-Mn interactions. Plastic deformation makes Mn atoms on the regular site sub…
The Ross (R) plastic caliper scale (y) systematically overestimates the true thickness (x): y = 1.148 X +0.112, r = 0.999. The Harpenden (H) ealiper scale was accurate.The jaw pressure of the Ross caliper (X± SD = 12.0 ± 0.9 g/mm2) overestimated the Harpenden pressure (7.95 ±0.2 g/mm2), compensating somewhat the scale…
Résumé- Les relations entre ségrégation intergranulaire et fragilisation par I'hydrogène des métaux peuvent s'envisager d'un double point de vue: 1°) L'hydrogène a une forte tendance à ségrêger dans les défauts de struc-ture et en particulier les joints de grains. Cette ségrégation…
Résumé.- Les joints de grains des isolants, des semiconducteurs et des métaux pré-sentent des propriétés électriques très différentes que nous exposons de manière succinte dans le cas des isolants et des semiconducteurs et de manière plus détail-lée dans celui des métaux. Abstract.- The electrical properties of grain…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComparative kinetics of axial ligation to ruthenium and iron porphyrin and phthalocyanine complexes. The relationship between spin state and cis- and trans- effectsFrank Pomposo, David Carruthers, and Dennis V. StynesCite this: Inorg. Chem. 1982, 21, 12, 4245–4248Publication…
Development of a special application of hafnium for pressurized water reactor control rods is discussed. A unique feature of the design is the sealing of the hafnium material inside protective stainless steel tubing, whereas in prior applications the hafnium material was exposed directly to the reactor primary coolant…
Abstract. Ecology and morphology of Alcyonium (Parerythropodium) coralloides were studied in different sites of the Eastern Atlantic and the Mediterranean. The species is extremely variable in size, colony shape and colour. In the Mediterranean population, encrusting red colonies are mostly encountered, although lobat…
The electronic states of the V 4+ ions in β-Na 0.33 V 2 O 5 are studied by NMR and EPR measurements. The anomalous temperature dependence of the Knight shift of the 51 V nuclei in site I can be understood by the spin singlet ground state of the electron pairs of the adjacent V 4+ ions (bipolarons). Recent X-ray diffra…
Order-of-magnitude improvement of the quantum efficiency of metal-oxide-metal detectors is achieved in the visible spectrum by fabricating the devices on silica substrates structured with a periodic array of bumps separated by about 0.25 microm. Structuring metallic films affords improved coupling of the detector to v…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal and molecular structure of .beta.-maltose octaacetate. A model in retrospect for amylose triacetate?F. Brisse, R. H. Marchessault, S. Perez, and P. ZugenmaierCite this: J. Am. Chem. Soc. 1982, 104, 26, 7470–7476Publication Date (Print):December 1, 1982Publication His…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrogen-deuterium kinetic isotope effects of 16 and 22 in the oxidation of hydrogen peroxideJohn A. Gilbert, Susan W. Gersten, and Thomas J. MeyerCite this: J. Am. Chem. Soc. 1982, 104, 24, 6872–6873Publication Date (Print):December 1, 1982Publication History Published onli…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTWavelength-dependent photostable or photoreversible photochromic systemR. Schmidt, W. Drews, and H. D. BrauerCite this: J. Phys. Chem. 1982, 86, 25, 4909–4913Publication Date (Print):December 1, 1982Publication History Published online1 May 2002Published inissue 1 December 1…
Formation of aluminosilicate glasses containing oxides of rare‐earth elements, e.g. Sc, Ce, Pr, Nd, Eu, Gd, Tb, Dy, Ho, Er, and Yb, was studied by melting at 1550°C and air quenching. The upper limit of the amount of rare‐earth oxide which can be incorporated into the aluminosilicate glasses decreases according to the…
Polarized neutron diffraction has been an extremely valuable technique for studying outer electron distributions in magnetic materials through measurements of magnetic form factors. Representative results are presented on the following classes of elemental materials : 3d ferromagnetic metals, paramagnetic metals, rare…
A three-chained peptide from type I collagen, crosslinked by hydroxyaldolhistidine, has been isolated from a tryptic digest of 5 M guanidine.HCl-insoluble bovine skin collagen (a small but as yet unknown percentage of the total collagen in whole skin). OsO(4)/NaIO(4) specifically cleaved the crosslink at its double bo…
Ten cation contaminants, namely Al, Ga, Co, Fe, Mg, Zn, Zr, Ca, Sr, and Ba were investigated for their effects on the electrical properties, microstructures, and discoloration of conductive TiO2 ceramics. It was found that Al, Ga, Co, Fe, and Mg cause discoloration and increase the electrical resistivity by a factor o…
Comparison of the plastic flow properties of transforming metastable austenite, stable austenite, and martensite over a range of temperatures and strain rates allows quantitative estimates of (a) the static-hardening effect of the two-phase mixture and (b) the dynamic-softening effect of the transformation as a deform…
The solubilities of the elements Mg and Ca are determined in monocrystalline silicon. The doping is accomplished using liquid‐phase epitaxy of silicon from Mg/Si or Ca/Si melts. Both Mg and Ca exhibit a strong retrograde solubility. The maximum solubility of Mg in silicon is ; that of Ca in silicon is . The segregatio…