Materials Literature
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Abstract Five basalt samples from the Point Sal ophiolite, California, were examined using HRTEM and AEM in order to compare observations with interpretations of XRD patterns and microprobe analyses. XRD data from ethylene‐glycol‐saturated samples indicate the following percentages of chlorite in mixed‐layer chlorite–…
The luminescence properties of ${\mathrm{Eu}}^{3+}$ ions in yttria-stabilized zirconia crystals are studied on samples with various yttria concentrations by using site-selective spectroscopy. From the analysis of luminescence spectra excited by ultraviolet light, it is found that the average crystal-field strength whi…
Rhombohedral distortion caused by the shape of the organic ions is found in the antiperovskite structures of all four ternary salts 1,which were obtained by electrocrystallization of the components tetrathiafulvalene (TTF),tetrabutylammonium halohexamolybdate, and tetrabutylammonium halide. The three-fold symmetry is…
The role of oxygen in affecting the adhesive bonding at the metal/polyimide (polyimide-on-metal) interface has been studied. Both pyromellitic dianhydride (PMDA) -oxydianiline (ODA) and biphenyl-tetracarboxylic dianhydride(BPDA) -p-phenylene diamine (PDA) based poly(amic acid) precursors were cast and fully imidized o…
For pt.VIII see ibid., vol.7, no.5, p.9 et seq. (1991). The physical aspects of partial discharge (PD) in SF/sub 6/ gas-insulated substations (GIS) are reviewed. The orientation is toward present and developing techniques for evaluating defects in solid and gaseous insulation systems on the basis of PD measurement. St…
Abstract Correlations are established between the structural data provided by x‐ray diffraction and Raman spectroscopy on borate crystals. A linear relationship is found to be adequate to describe the bond length‐stretching frequency correlations in nine meta‐, pyro‐ and ortho‐borate crystals consisting solely of tria…
In this paper, we present numerical calculations of the band spectrum of periodic approximants of the octagonal quasiperiodic tiling. We have studied a one-parameter family of Hamiltonians, including the pure hopping case, the Laplacian, and a regime in which atomic potentials prevail. We have found a parameter range…
Polarization experiments to assess the suitability of oxalic and nitric salts as potential inhibitors for the corrosion of aluminum alloy 7075 by sodium chloride revealed that a mixture of the two salts best reduces the observed rates of corrosion. The oxalate ions cause a separation between the pitting and corrosion…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure characterization of polyurethanes containing poly(dimethylsiloxane)Mitsuhiro Shibayama, Masakatsu Suetsugu, Shinichi Sakurai, Tomoyuki Yamamoto, and Shunji NomuraCite this: Macromolecules 1991, 24, 23, 6254–6262Publication Date (Print):November 1, 1991Publication H…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConformational characteristics of some model polydienes and polyolefinsPaul Hattam, Stephen Gauntlett, Jimmy W. Mays, Nikos Hadjichristidis, Ronald N. Young, and Lewis J. FettersCite this: Macromolecules 1991, 24, 23, 6199–6209Publication Date (Print):November 1, 1991Publica…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhenomenological kinetics of complex systems: mechanistic considerations in the solubilization of hemicelluloses following aqueous/steam treatmentsK. Belkacemi, N. Abatzoglou, R. P. Overend, and E. ChornetCite this: Ind. Eng. Chem. Res. 1991, 30, 11, 2416–2425Publication Dat…
Aqueous mixtures of Zr(C 2 H 3 O 2 ) 4 and Gd(NO 3 ) 3 were used to prepare chemically homogeneous ZrO 2 —Gd 2 O 3 solid solutions containing 0 to 9 mol% Gd 2 O 3 . The application of kinetically limited equilibria concepts explains why a metastable tetragonal phase crystallized subsequent to precursor pyrolysis from…
Abstract Illite crystallinity (IC) and other indicators of the grade of very‐low‐grade metamorphism associated with the appearance of various stages of slaty cleavage in phyllosilicate‐rich rocks have been compiled from a wide variety of terranes. IC values have been converted to a Kübler‐equivalent standard scale, bu…
The influence of silver oxide additions on the fracture behavior of YBa2Cu3O7−x superconducting ceramic was studied. The KIC value has been found to increase from about 1 MPa√m to as much as 2.4 MPa√m with the blending of 30 wt.% Ag2O with the 1-2-3 powder. All compositions exhibited increasing resistance to fracture…
Polyurethanes chain extended with N,N-bis (2-hydroxyethyl)-2-aminoethane-sulfonic acid (BES) were synthesized. The effect of the sulfonic acid group on the polymers' bulk, surface, and blood-contacting properties was evaluated by comparing the BES-based polymers with polyurethanes based on N-ethyldiethanolamine (EDEA)…
The interiors of hysteresis loops were examined for commercial recording tape samples of gamma -Fe/sub 2/O/sub 3/ and Co-modified gamma -Fe/sub 2/O/sub 3/. It was found that the minor loops did not satisfy the congruency condition of the classical Preisach model. Since both the moving model and the product model are c…
An elementary discussion of time-dependent correlation functions is presented. These functions are discussed in the context of dielectric relaxation and nuclear magnetic resonance for two forms of decay: Simple exponential and stretched (Kohlrausch–Williams–Watts) exponential. A guide to the calculation of the stretch…
The ultimate resolution in secondary-electron images obtained in a scanning transmission electron microscope depends strongly on secondary-electron-production mechanisms. In such a microscope, equipped with an electron-energy-loss spectrometer as well as secondary-electron-energy analyzer, coincidences have been achie…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTShallow reorientation in the surface dynamics of plasma-treated fluorinated ethylene-propylene polymerHans J. Griesser, Youxian Da, Anthony E. Hughes, Thomas R. Gengenbach, and Albert W. H. MauCite this: Langmuir 1991, 7, 11, 2484–2491Publication Date (Print):November 1, 199…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLiquid-crystalline polyethers based on conformational isomerism. 18. Polyethers based on a combined mesogenic unit containing rigid and flexible groups: 1-(4-hydroxy-4'-biphenyl)-2-(4-hydroxyphenyl)butaneVirgil Percec and Masaya KawasumiCite this: Macromolecules 1991, 24, 23…