Materials Literature
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The polymerization of a commercial polyester resin was investigated by differential scanning calorimetry (DSC). The conversion profiles were obtained in the temperature range 60–80°C. The autocatalytic model satisfactorily describes the experimental data. Fourier transform infrared spectroscopy (FTIR) measurements wer…
Shape memory alloy (SMA) has been considered as an actuator for applications that require large force and displacement. Two factors have hampered the usefulness of such actuators: a hysteretic input-output relation and bandwidth limitations. This paper considers the hysteresis phenomenon from a control point of view.…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTBinuclear Complexes as Models for Adjacent-Metal Involvement in C−H Bond-Cleavage and C−C Bond-Formation Steps Relevant to Fischer−Tropsch ChemistryJeffrey R. Torkelson, Robert McDonald, and Martin CowieView Author Information Department of Chemistry, University of Alb…
High temperature flow stress data obtained from laboratory scale isothermal forging tests on two titanium alloys, IMI550 (Ti-4Al-4Mo-2Sn-0.5Si) and Ti-10V-2Fe-3Al, have been correlated using a generalised hot working equation. The (α + β) titanium alloy IMI 550 was studied at temperatures in the range 900–950°C, high…
The structural elucidation of 24 xanthones with different substitution patterns was performed by spectroscopic methods, namely 2D NMR techniques, such as correlation spectroscopy (COSY), nuclear Overhauser effect (NOE), heteronuclear correlation (HETCOR) and a 1D NMR technique, selective insensitive nuclei enhanced by…
New comb-shaped LC copolymers based on phenyl benzoate and menthyl-containing monomers were synthesized. Phase behaviour, optical properties and structure of the synthesized copolymers with different compositions were studied. Specific features of the development of helical nematic and smectic mesophases (N*, NB*, Ncy…
Abstract Chrisstanleyite, Ag 2 Pd 3 Se 4 , is a new mineral from gold-bearing carbonate veins in Middle Devonian limestones at Hope's Nose, Torquay, Devon, England. It is associated with palladian and argentian gold, fischesserite, clausthalite, eucairite, tiemannite, umangite, a Pd arsenide-antimonide (possibly merti…
Room-temperature Raman-scattering spectra are reported for the type-II superconductors ${\mathrm{M}}_{x}{\mathrm{Ba}}_{y}{\mathrm{Si}}_{46}$ (M=Na,K) that were recently shown to exhibit ${T}_{c}$'s \ensuremath{\sim}3.5 K. These spectra are compared to those of ${\mathrm{Na}}_{8}{\mathrm{Si}}_{46}$ and ${\mathrm{K}}_{7…
The thermal conductivity of thin e lms (0.01 ‐ 100 mm) governs the heat transfer characteristics and affects the performance and reliability of the microelectronic devices in which they are used. To measure the thermal conductivity of these e lms, several different steady-state and transient techniques have been devel…
The P-T equilibrium curve of the reaction of magnesite + enstatite = forsterite and CO 2 was determined in the ranges 6-25 kbar and 700-1100 °C by 53 reversed experiments carried out in 1.91 cm diameter piston-cylinder apparatus with NaCl pressure medium. Silver oxalate was used as a CO 2 source and charges were buffe…
Schorl-dravite and schorl-elbaite from different zones of the rare-element-enriched complex granitic pegmatite dykes of the Cruzeiro mine, in Minas Gerais, Brazil, were analyzed by electron and ion (H, Li, B) microprobes. General mechanisms of substitution (common to schorl and to independently of their position in th…
A series of rare earth (Gd, Eu, Tb) complexes with different substituent group carboxylic acids (ortho-hydroxylbenzioc acid, ortho-aminobenzoic acid and ortho- methoxy benzoic acid) and 1,10-phenanthroline were synthesized. The spectroscopic studies of the photophysical properties such as luminescence properties, ener…
In order to determine effects of hydrogen peroxide on stress corrosion cracking of structural materials in the primary cooling systems of boiling water reactors, a high temperature high pressure water loop with controlled hydrogen peroxide concentrations and lower possible oxygen concentrations has been fabricated. Te…
Far-infrared transmittance of a SrTiO3 thin film deposited on a sapphire substrate by laser ablation was measured in the frequency range 25–200 cm–1 at temperatures from 5K up to 300 K. An interesting difference between the temperature behaviour of the polar soft mode in the thin film and the one in bulk material was…
Columbite-group minerals and ixiolite with extremely variable concentrations of scandium are widespread in moderately to highly fractionated rare-element granitic pegmatites. Columbite-group minerals with 1-3 wt.% Sc 2 O 3 are referred to as scandian columbite-tantalite and show degrees of structural order similar to…
Commercially available carbodiimides in hydroxylic solvents containing hydrogen peroxide with mildly basic or acidic catalysts have been found to promote the epoxidation of olefins. A commercially available 30% aqueous solution of hydrogen peroxide serves as the oxidant for this process. The presumed reactive species…
The structure of weakly charged temperature sensitive gels has been investigated in deformed state by means of small-angle neutron scattering (SANS). At low temperatures where the gel is in a good solvent, the scattered intensity pattern was isotropic even for deformed gels. When the temperature was raised to 42 °C, t…
Blends of polycarbonate/acrylonitrile–butadiene–styrene terpolymer (PC/ABS) and polycarbonate/maleic anhydride grafted ABS (PC/MABS) were prepared over the whole range of compositions using a single-screw extruder. Tensile, flexural, notched Izod impact properties, and the heat deflection temperature of these blends w…
Fractoluminescence and charge emission upon three-point-bending fracture of synthetic and natural quartz crystals have been studied. Broad luminescence bands centered at about 2.0, 2.9, and 5.0 eV have been observed in both cases. Time-resolved luminescence measurement could be performed on the 2.0 and 2.9 eV bands. T…
Wodginite (ideally MnSnTa 2 O 8 ), and the rarer species, ferrowodginite (ideally Fe (super 2+) SnTa 2 O 8 ) and titanowodginite (ideally MnTiTa 2 O 8 ), have been discovered in rare-element granitic pegmatites of the complex type, petalite subtype, which occur in the Separation Rapids pegmatite field, northwestern On…