Materials Literature
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Peculiarities of the absorption saturation in doping superlattices with n-i-p-i crystal type structure are established. Calculations are performed in the k-selection rule model taking into account the screening of the electrostatic potential by current carriers and the density state tails.
Magnetoresistance of an insulating quasicrystalline AlPdRe film in large magnetic fields, Ralph Rosenbaum, Alexander Milner, Roland Haberkern, Peter Häussler, Eric Palm, Tim Murphy, Scott Hannahs, Bruce Brandt
Model polyurethane ionomer solution studies revealed that the critical parameters determining the solution behavior of ionomers are solvent polarity, solvent−backbone interactions, and ionic content of the ionomer. The three parameters are used to develop a novel ionomer solution diagram which provides a framework for…
We calculate the cyclization rate k(t) of a single polymer chain with charged end groups, where cyclization takes place with probability of one when the ends approach each other at a distance smaller than the reaction radius R. Using Monte Carlo simulations in a kink-jump model we show that the long-time asymptotic va…
Ferroelectric SrBi2Ta2O9 thin films on Pt/Ti/SiO2/Si were successfully synthesized by the modified polymeric precursor method. The films were deposited by spin coating and crystallized by rapid thermal annealing in a halogen lamp furnace, followed by postannealing at temperatures ranging from 700 °C to 800 °C in an ox…
A series of complexes of the type [TpRe(CO)(L D )(η 2 -ethylene)] has been synthesized, where L D is t BuNC, PMe 3, pyridine, 1-methylimidazole, or NH 3 (increasing in electron-donating ability of L D ). The rates of the propeller-like rotation of ethylene about the ethylene−rhenium bond have been determined using spi…
Transparent conducting In2O3 films were deposited on glass substrates by an oxygen ion assisted deposition. Microstructure, chemical composition, electrical, and optical properties of the deposited films were investigated as a function of arrival ratio and ion energy. At 60 eV oxygen ion bombardment, the microstructur…
In the title complex, [Zn(C(36)H(20)N(4)S(4))], the Zn(II) ion occupies a special position on an inversion centre with four-coordinate geometry. The porphyrin ring shows a wave-like conformation, with the closest interporphyrin plane separation being 3.60 (6) A. The two disordered thienyl groups are inclined with resp…
We present a simple sp 3 s* tight-binding model for use in calculating the band structures of single-walled carbon nanotubes. The 2s, 2p x , 2p y , 2p z , and s* orbitals of each carbon atom are used as the basis set for expressing the tight-binding model, and the interatom interaction between neighbouring sites is fu…
Abstract This paper is devoted to a numerical method able to help the determination of the bifurcation threshold in non‐linear time‐independent continuum mechanic problems. First, some theoretical results about uniqueness are recalled. In the framework of the large‐strain assumption, the differences between the classi…
2398-2399
Methods to chemically passivate the surfaces of amorphous-carbon films (a-C) produced by dc magnetron sputtering were studied. The chemical composition of carbon surfaces produced via sputtering are dependent upon the environment to which the carbon is exposed immediately following deposition. When the sputtered film…
We describe in detail a method by which to establish the magnetic anisotropy of thin ferromagnetic films on strongly paramagnetic substrates that are slightly anisotropic. The film that we consider is composed of the much studied manganite La0.7Ca0.3MnO3 and the substrate is NdGaO3, a good lattice match. Below a Curie…
Non-linear susceptibilities for use in describing the second-harmonic generation (SHG) recently observed in the hexagonal manganites RMnO 3 (R = Sc, Y, Ho, Er, Tm, Yb, Lu) below the Néel temperature T N are derived. Their explicit expressions show that they should give rise to quite different spectra according to whet…
Low-temperature-adapted archaea are abundant in the environment, yet little is known about the thermal adaptation of their proteins. We have previously compared elongation factor 2 (EF-2) proteins from Antarctic (Methanococcoides burtonii) and thermophilic (Methanosarcina thermophila) methanogens and found that the M.…
Vitreous selenium is used extensively for light detection. Its photoconducting properties are altered by structural relaxation near room temperature. X-ray diffraction, densiometry, and calorimetry are used to determine the change of the glass state during relaxation. Annealing for 24 h at 300 K increases the density…
We propose a molecular thermodynamic framework to describe liquid–liquid equilibria of hyperbranched polymer solutions. The model is based on the lattice cluster theory and the hydrogen-bonding model. We examine phase behaviors of hyperbranched polymer solutions in the effect of a branched structure and hydrogen bondi…
The longitudinal sound velocity v s ( T ) has been measured for La 1- X Ca X MnO 3 crystals, and anomalous softenings of v s ( T ) have been observed at the peculiar Ca concentrations of X =0.19 and X =0.82. For the X =0.19 sample, in which the ferromagnetic (FM) metallic phase competes with the FM insulating phase wi…
The hysteresis of composite systems consisting of nanosized ferromagnetic particles embedded in a nonmagnetic metal matrix is studied using the Monte Carlo method. In the model, the nanosized particles are assumed to be single domain and to possess random uniaxial anisotropy. The particles are well dispersed so that t…
Two crystal structures of human ornithine transcarbamylase (OTCase) complexed with the substrate carbamoyl phosphate (CP) have been solved. One structure, whose crystals were prepared by substituting N-phosphonacetyl-L-ornithine (PALO) liganded crystals with CP, has been refined at 2.4 A (1 A=0.1 nm) resolution to a c…