Materials Literature
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We perform Monte-Carlo simulations to obtain quantitative results for the anomalous Hall resistance, ${R}_{A},$ observed in colossal magnetoresistance manganites. ${R}_{A}$ arises from the interaction between the spin magnetization and topological defects via spin-orbit coupling. We study these defects and how they ar…
In a recent paper it has been proposed that the four-orbital model of Gouterman should be replaced by a new band assignment scheme for the MPc UV−visible absorption spectrum. Since this proposed assignment scheme would alter the basis for the spectral analysis of a wide range of complexes, its validity is tested again…
Lanthanide tris(beta-diketonates) formed stable, 1:1 highly coordinated complexes with amino alcohols, and the resulting complexes exhibited large enhanced fluorescence and intense induced circular dichroism (CD) signals. The stability constants of the highly coordinated complexes were determined for various combinati…
A novel one-step soft solution-processing route called the solvothermal-copolymerization technique was successfully developed for in situ fabrication of polystyrene (PS)/CdS nanocomposites embedded with CdS nanowires in ethylenediamine media at lower temperatures (80−140 °C). In this route, the polymerization of the m…
Proceedings of the National Academy of Sciences (PNAS), a peer reviewed journal of the National Academy of Sciences (NAS) - an authoritative source of high-impact, original research that broadly spans the biological, physical, and social sciences.
It is shown that a nonperiodic Kronig-Penney model exhibits mobility edges if the positions of the scatterers are correlated at long distances. An analytical expression for the energy-dependent localization length is derived for weak disorder in terms of the real-space correlators defining the structural disorder in t…
The secondary structures of wheat gliadins (a major storage protein fraction from gluten) in film-forming solutions and their evolution during film formation were investigated by Fourier transform infrared spectroscopy. In the film-forming solution, wheat gliadins presented a mixture of different secondary structures,…
Fluorinated armchair (10,10) and zigzag (18,0) single-wall carbon nanotubes (F-SWNT) of ${\mathrm{C}}_{2}\mathrm{F}$ stoichiometry with five different fluorine atom decorations are studied using density-functional theory and periodic boundary conditions. The most stable armchair F-SWNT isomers $(1a$ and $5a)$ are meta…
We study propagation dynamics of a particle phase in a single-file pore connected to a reservoir of particles (bulk liquid phase). We show that the total mass $M(t)$ of particles entering the pore up to time $t$ grows as $M(t) = 2 m(J,ρ_F) \sqrt{D_0 t}$, where $D_0$ is the "bare" diffusion coefficient and the prefacto…
The theoretical studies of optical properties of Ga$_{1-x}$In$_x$As self-assembled quantum-wires (QWR's) made of short-period superlattices with strain-induced lateral ordering are presented. Valence-band anisotropy, band mixing, and effects due to local strain distribution at the atomistic level are all taken into ac…
Molecular dynamics simulations of diluted (~2.5 weight percent) aqueous solutions of two polyelectrolytes, namely sodium carboxy methyl cellulose (CMC) and sodium poly(acrylate) (PAA) have been performed. Water and counterions were taken into account explicitly. For CMC the substitution pattern and starting conformati…
In this letter, we report on the excitation efficiency of erbium ions by hot electrons and holes in Si:Er:O and Si1−yCy:Er pn diodes at 10 K. In forward bias, a higher electroluminescence efficiency at 1.54 μm is observed for incorporating the erbium ions in the p region of the diode, where enough holes are present to…
The ground state vibrational energy levels of jet-cooled SiCH and SiCD have been studied by a combination of laser-induced fluorescence and wavelength-resolved fluorescence techniques. The radicals were produced by a pulsed electric discharge at the exit of a supersonic expansion using tetramethylsilane or methyltrich…
In this letter, we report the observation of an ultraviolet (UV) photoluminescence (PL) emission at around 330 nm in porous silica prepared by the sol–gel process. Upon a posttreatment which leads to OH adsorption, the intensity of the observed UV PL emission increases significantly. It is shown that this behavior is…
A 30-ft/s vertical drop test of a fuselage section of a Boeing 737 aircraft was conducted in October of 1999 at the FAA Technical Center in Atlantic City, NJ. This test was performed to evaluate the structural integrity of a conformable auxiliary fuel tank mounted beneath the floor and to determine its effect on the i…
The impact of short-range repulsive interactions between nuclei on the evolution of a phase transformation is studied in order to describe quantitatively the kinetics of the transformation and to characterize systematically the resulting microstructures. For these purposes both computer simulation and analytical metho…
The response of a mesoscopic layered structure to deformation normal to the layers is prevalently accepted to occur by an undulation instability, a model which was developed for and tested extensively in liquid-crystalline systems. This model has been applied to a layered block copolymer melt by theoretical considerat…
Direct structural evidence of the periodic ordering of neutral and ionic planes is reported for 2,6-dimethyltetrathiafulvalene-p-chloranil, detected by high-resolution x-ray diffraction experiments. Simultaneous to the neutral-ionic layered ordering, theoretically predicted a long time ago to occur in stages, an antip…
Polycrystalline and glassy LiAlSi2O6 are studied by dielectric relaxation measurements for the purpose of characterizing the nearly frequency independent contribution to the dielectric loss (near constant loss), which is commonly found in glassy ionic conductors independent of the chemical and physical structures. The…
Vibrational contributions to the dipole polarizabilities and hyperpolarizabilities of cyclopropenone and cyclopropenethione are reported. Simultaneous calculations have been carried out for the respective saturated and noncyclic counterparts of these molecules. The results have been analyzed and interpreted in terms o…