Materials Literature
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The perovskite-type compounds Sr 2 LnRuO 6 (Ln = Eu-Lu) have been synthesized, and their crystal structures and magnetic properties have been investigated. Powder x-ray diffraction measurements and the Rietveld analysis show that they are monoclinic with space group P 2 1 / n and that Ln 3+ and Ru 5+ ions are structur…
The absolute fluorescent quantum efficiencies of NBS phosphor standard samples which were excited by a 254nm radiation were measured by a polychromator. The polychromator was calibrated by a conical cavity thermal radiation detector, which used polyvinylidene fluoride (PVDF) films, coated inside with gold black absorb…
The Mechanics-Materials Linkage (M. Meyers, et al.) Essentials to Solid Mechanics (J. Willis) Foundations of Solids Mechanics (J. Rice) Elastic Anisotropy (D. Barnett) Structure Property Relations: Impact of Electron Microscopy (G. Thomas) Nature of Elastic Stiffness and Plastic Strength (J. Gilman) Rate Processes in…
Surface topography appears to be an important but often neglected factor in implant performance. In this study, fibroblasts were cultured on a range of porous polycarbonate (PC) membranes with well defined surface topography (track-etched micropores, 0.2-8.0 microm in diameter) and wettability gradients. The wettabili…
The origin of the second, faster relaxation process in Mn12 molecules has been identified as a different relative orientation of the Jahn–Teller elongation axes of the MnIII ions, which we have termed ‘Jahn–Teller isomerism’.
The Methanococcus jannaschii gene MJ1392 was cloned, and its protein product was hyperexpressed in Escherichia coli. The resulting protein was purified and shown to catalyze the condensation of pyruvate and acetyl coenzyme A, with the formation of (R)-citramalate. Thus, this gene (cimA) encodes an (R)-citramalate synt…
The magnetic phase diagram of ${\mathrm{La}}_{1\ensuremath{-}\ensuremath{\delta}}{\mathrm{MnO}}_{3}$ powdered samples has been studied as a function of $\ensuremath{\delta}$ in the low doping range $(\ensuremath{\delta}<0.1).{\mathrm{La}}_{0.97}{\mathrm{MnO}}_{3}$ has a canted magnetic structure at low temperature…
The polarization behaviors of porous platinum and , (LSM) cathodes with zirconia electrolytes with various ionic conductivities were investigated. The exchange current density, , on Pt cathode was not infuenced by the at 900 and 1000°C, whereas increased proportionally to at a lower temperature of 800°C. However, the…
A bis-terpyridine complex of iridium(III) incorporating a pendent pyridyl group displays long-lived emission at pH 7 in air-equilibrated aqueous solution, but both the lifetime and intensity are reduced by a factor of >8 upon protonation of the pyridyl nitrogen; structurally similar complexes with pendent phenolic gro…
The mechanism of interaction between subcellular pigment microparticles and short pulse laser radiation was investigated with nanosecond time-resolved microscopy and fluorescence microscopy. Stroboscopic illumination was used to capture images of transient events induced in cells by laser pulses. Fluorescence microsco…
Several attempts have been made to compatibilize immiscible blends by introducing suitably-chosen polymer additives. This work studies the EPDM elastomer, chemically modified with maleic anhydride (MA), through reaction in solution of EPDM and MA, using dibenzoyl peroxide as an initiator. The best conditions for obtai…
Transmission electron microscopy is used to determine the microstructures of a Ti-50.8 at% Ni alloy given different aging treatments. Two different peak-aging treatments are shown to result in disk shaped semi-coherent Ti3Ni4 precipitates with a diameter ranging from 50 nm to 200 nm depending on the aging temperature.…
The electrochemical and thermal properties of nonaqueous electrolytes containing a flame‐retardant additive hexamethoxycyclotriphosphazene were measured using cyclic voltammetry, electrochemical cycling, differential scanning calorimetery, and accelerating rate calorimetery. The flame‐retardant additive was synthesize…
Highly hydrophobic poly(tetrafluoroethylene) (PTFE) surfaces were modified with an air glow discharge plasma to improve their wettability. However, the hydrophilic character obtained diminishes with time, due to molecular movement in the polymer. We have determined that the ageing process is strongly affected by the e…
We present results from molecular dynamics simulations of the thermal glass transition in a dense polymer melt. In previous work we compared the simulation data with the idealized version of mode-coupling theory (MCT) and found that the theory provides a good description of the dynamics above the dynamical critical te…
We present the results of a specific heat study of the ${\mathrm{Pr}}_{0.6}({\mathrm{Ca}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}{)}_{0.4}{\mathrm{MnO}}_{3}(0<~x<~1)$ manganite system as a function of doping concentration x and temperature. The low-temperature specific heat data indicate that these materials have De…
Electrodes of conductive nitrogen‐incorporated tetrahedral amorphous carbon films ( taC : N ) deposited at ambient temperatures are shown to possess an extraordinary combination of the stability associated with boron‐doped diamonds and greatly enhanced electrocatalytic properties. In this first communication on the el…
Diamondlike carbon (DLC) prepared by plasma-enhanced CVD is a metastable amorphous material characterized by attractive optical, electrical, chemical, and tribological properties. DLC films can be prepared at low temperatures from a large variety of precursors, and can be modified by the incorporation of different ele…
Mesoporous molecular sieve silicas with ordered structures are formed from tetraethylorthosilicate (I0) in a new reaction pathway based on nonionic R(EO)nH surfactants (N0) and denoted (N0Mn+)I0, wherein electrostatic forces are introduced into the assembly process through –(EO)nH complexation of small metal cations (…
The ability to predict or confirm ferroresonance and to evaluate its severity depends primarily on the correctness of the transformer model used in the computer simulation. An equivalent circuit is developed here for the widely used three-phase grounded-wye to grounded-wye five-legged wound-core distribution transform…