Materials Literature
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Abstract Nearly pure sepiolite clay crops out in a playa-like depression near El Bur, Central Plateau region of Somalia. The deposit is associated with the Lower to Mid-Eocene Taleh Formation that includes, besides limestone, dolomite and gypsiferous marls, extensive anhydrite and various evaporites, primarily gypsum.…
: We have used the technique of in situ electron microscopy to study the oxidation and reduction of the palladium (Pd) catalysts. In this study, we have subjected a Pd catalyst to oxidation and reduction cycles and studied the changes in particle structure and morphology with in situ electron diffraction and imaging.…
Abstract A physically based, isostructural, constitutive model is described for simulating the onset of nonlinear viscoelasticity in multiaxial creep of glassy polymers, as needed in stress analyses of load‐bearing components. In the linear viscoelastic limit, shear response reduces to that of a generalized Maxwell mo…
In this paper, the mechanical and rheological properties, and the microstructure of the starch-glycerine blend prepared by a single-screw-extruder have been studied. Considering the rheology of the blend under different temperatures, we calculated the activation energy of the fluid of the blend to be 122.5 KJ/mol. Thr…
The crystal structure of a synthetic NaAlSiO4 modification has been solved and refined to an R index of 0.020 for 2745 independent reflections. The compound is hexagonal with space group symmetry P6 1 , a = 9.995(2) Å and c = 24.797(4) Å. The crystal showed twinning by merohedry according to m 210 , which was accounte…
Abstract Halloysite and kaolinite coexist in anorthosite weathering profiles in the Sancheong district, Korea. X-ray diffraction (XRD) analysis on a transect of partially weathered anorthosites reveals an increasing amount of kaolinite development with weathering age. Microtextures were examined by scanning electron m…
A numerical model was developed to simulate and study microwave-induced transport in ionic solids. The model is based on continuum equations, is very general, and could be applied to many materials. The assumptions, boundary conditions, initial conditions, and numerical techniques used in the model are described. Resu…
Abstract The Danian of the Provence basin (SE France) is characterized by a strong subatmospheric alteration processes throughout the basin. A wide range of facies, depositional and weathering, were recognized in an interval of 5 Myr and include floodplain fine-grained alluvium, palustrine limestones, playa dolostones…
We report an unprecedentedly large spontaneous Hall effect in ferromagnetic ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}{\mathrm{CoO}}_{3}$ $(0.2<~x<~0.5)$ epitaxial films. The effect exceeds existing theoretical predictions for the value of the spontaneous Hall resistivity ${\ensuremath{\rho}}_{\mathrm{xy…
A series of epoxy-based second-order nonlinear optical (NLO) polymers containing heteroaromatic chromophores have been designed. Precursor polymers were prepared from the polymerization between the diglycidyl ether of Bisphenol A and aniline or 4-(2-thienyl)aniline. The precursor polymers were postfunctionalized by an…
Mdssbauer data were obtained from 14 specimens of chrysotile taken from three geologically well-characterized serpentinites. These data were used in conjunction with results of electron-microprobe (major elements) and uranium-extraction analyses (HrO) to generate a comprehensive set of compositions for chrysotile. Chr…
We present results on the magnetic reversal process in epitaxial Sm–Co(11̄00)/TM (TM=Fe, Co) bilayer films prepared via magnetron sputtering onto Cr-buffered single-crystal MgO substrates. The magnetically hard Sm–Co films have 20 T uniaxial anisotropy and coercivities &gt;3 T at room temperature. The magnetizatio…
Crystals of sodium heptasilicate (Na 8 Si 7 O 18 ) have been grown at 9 GPa, 1000 0 C using the MA6/8 superpress at Edmonton. The X-ray structure was determined at room pressure (R = 5.8%). Sodium heptasilicate is trigonal with a = 7.180(1) Å. α = 87.26(1)°, space group Rbu671, Z= I, and D x = 3.009 g/cm 3 . The struc…
Stannous tungstate, ${\mathrm{SnWO}}_{4},$ crystallizes in the low-temperature \ensuremath{\alpha} and high-temperature \ensuremath{\beta} phases. $\ensuremath{\alpha}\ensuremath{-}{\mathrm{SnWO}}_{4}$ powders were prepared by heating an equimolar mixture of SnO and ${\mathrm{WO}}_{3}$ either in vacuum or in argon atm…
The combination of this work, an earlier study [1] concerning the effects of thermo-oxidative aging on the thermal, fracture and compressive behavior of carbon-fiber reinforced epoxy composites, and a companion paper [2] discussing the failure mechanisms due to thermo-oxidative aging provide the first published compre…
Preparation of Perovskite‐Type La1 − x Sr x MnO3 Films by Vapor‐Phase Processes and Their Electrochemical Properties: II. Effects of Doping Strontium to LaMnO3 on the Electrode Properties, Ioroi, Tsutomu, Hara, Tatsunori, Uchimoto, Yoshiharu, Ogumi, Zempachi, Takehara, Zen‐ichiro
A field-induced instability of wall defects, commonly called oily streaks, is observed in cholesteric liquid crystals. The electric field favors reorientation of cholesteric layers and drives the line tension of the oily streaks negative. Defects with negative line tension elongate, preserving their width. The electri…
The ability of sodium linear-saturated carboxylates to protect magnesium alloys against aqueous corrosion was characterized. Electrochemical measurements of polarization resistance (Rp) and corrosion current (Icorr) showed the inhibition efficiency of these compounds is a function of their concentration and of the len…
The behavior of a random $\mathrm{AB}$ multiblock copolymer melt with a Markovian sequence of monomers has been studied in the region where the spatially homogeneous state loses its stability. We use a generalization of the weak crystallization theory to the case of a polydisperse system. In the framework of both mean…
The molecular structures of polyethylene glycol (PEG) and chitosan (CS) are illustrated as follows: 1 CS 2 PEG The intermolecular interactions between these two polymers were studied by viscometry with a thermodynamic parameter α, which was first proposed by Sun et al. The weight additive rule of the intrinsic viscosi…