Materials Literature
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La 5/8 - x Pr x Ca 3/8 MnO 3 ( x = 0, 0.1, 0.2, 0.25, 0.3, 0.35, 0.375, 0.4, 0.412, 0.425, 0.45, 0.5, 5 / 8 ) series has been synthesized by the ceramic method. All manganites are single phase crystallizing in the Pnma space group. The evolution of cell parameters along the series indicates that the orthorhombic perov…
Exposing vanadium oxide nanoparticles on a Pd(111) surface to reducing conditions is shown to cause a spreading of the oxide over the metal until a reduced oxide phase covers the entire surface. Reoxidation reverses this process and oxide island structures and bare metal patches are reestablished. The physical origin…
The partly folded states of protein members of the lysozyme (LYS)/alpha-lactalbumin (LA) superfamily have been analyzed by circular dichroism (CD) measurements and limited proteolysis experiments. Hen, horse, dog, and pigeon LYSs and bovine LA were used in the present study. These are related proteins of 123- to 129-a…
ElectRelease was originally developed to temporarily bond monitoring instruments to supersonic fighter aircraft permitting subsequent disbonding without surface damage or marking. ElectRelease is an electrically disbonding epoxy adhesive. Article describes the development of the adhesive and its properties and applica…
A linear temperature dependence between -70 degrees C and +70 degrees C is reported for the peak stimulated emission cross section of Nd3+ ions in both yttrium aluminum garnet (YAG) and gadolinium scandium gallium garnet (GSGG).
We demonstrate that an A-type antiferromagnetic (AFM) state of ${\mathrm{Pr}}_{0.5}{\mathrm{Sr}}_{0.5}{\mathrm{MnO}}_{3}$ exhibits a charge ordering that governs the transport property. This charge ordering is stripelike, being characterized by a wave vector $\mathit{q}\ensuremath{\sim}(0,0,0.3)$ with very anisotropic…
We used time-resolved Fourier transform infrared spectroscopy (FTIR) to follow a conformation transition in Nephila spidroin film from random coil and/or helical structures to beta-sheet induced by the addition of KCl from 0.01 to 1.0 mol/L in D(2)O. Time series difference spectra showed parallel increases in absorpti…
Experimental data for foams lead to different values of the elastic moduli depending on the performed test, i.e. compression and tension tests give a different set of parameters than shear and bending tests. This may be explained by the size effect, which depends on the microstructure of the foams. Thus, in this paper…
The magnetic susceptibilities of a series of compounds, β'-X[Pd(dmit)2]2 (X = Me4As, Me4P, Me4Sb, Et2Me2P, and Et2Me2Sb, where Me = CH3 and Et = C2H5), have been investigated. The temperature dependence of χ has been analysed in terms of the two-dimensional spin-1/2 Heisenberg antiferromagnet on the triangular lattice…
In the present work, we studied thiram on silver surface by SERS. Investigations of disulfides with SERS revealed that the molecules undergo a surface reaction on silver, namely easy cleavage of the S-S bond. We believe that the two S atoms of resonance formed from the thiram may be chemisorbed strongly on Ag sol. Thi…
quasi-one-dimensional (1D) titania nanostructures - single-walled nanotubes formed by rolling [101] planes of TiO$_2$ (anatase phase) are modeled and their electronic properties and bond orders indices are studied using the tight-binding band theory. We show that all zigzag (n,0)- and armchair (n,n)-like nanotubes are…
The scaling properties of the roughness of surfaces grown by two different processes randomly alternating in time, are addressed. The duration of each application of the two primary processes is assumed to be independently drawn from given distribution functions. We analytically address processes in which the two prim…
We report experimental results on quasi-two-dimensional diffusion limited growth in directionally solidified succinonitrile with small amounts of poly(ethylene oxide), acetone, or camphor as a solute. Seaweed growth, or dense branching morphology, is selected by growing grains close to the [111] plane, where the in-pl…
The donor binding energies associated with the ground state and a few excited states, are computed as a function of the dot size and the impurity position within two and three dimensional GaAs quantum dots. The calculation has been done using the Potential Morphing Method - a recently developed numerical method for th…
Some FeTPP−Cl/carbon electrocatalysts, heat-treated at temperatures up to 800 °C, have been studied with cyclic voltammetry, x-ray photoelectron spectroscopy, extended X-ray absorption fine structure, and in situ Mössbauer spectroscopy. It appears that the heat treatment induces considerable site heterogeneity in elec…
We use extended Mie theory to investigate optical forces induced by and acting on small silver nanoparticle aggregates excited at surface plasmon resonance. It is shown that single molecules can be trapped at junctions between closely spaced nanoparticles, which are simultaneously pulled together by optical forces. Th…
An autocatalytic electroless gold process suitable for electronic packaging applications, particularly wirebonding needs, is described. This process yields high purity, non porous soft gold of any thickness that meets or exceeds all military specifications. The process can be used for a wide variety of organic laminat…
The non complete charge collection efficiency observed in Semi-Insulating (SI) Gallium Arsenide (GaAs) particle detectors has been generally attributed to trapping effects. However most of the detectors analyzed in literature can only operate below the depletion voltage. We present a careful analysis of the output sig…
Recent improved of larger-scaled microwave devices at the field such as communication systems demand a high-performance wiring substrate which has high thermal conductivity and good high-frequency characteristics. Aluminum nitride (AlN) has been considered a hopeful candidate to meet these demands because of its high…
We studies the surface characteristics and mechanical properties of four brands of poly(ether urethane) feeding tubes incubated for eight weeks at 37/spl deg/C in simulated gastric juice. Surface degradation was characterized by scanning electron microscopy and energy dispersive spectroscopy (SEM/EDS). Changes in mech…