Materials Literature
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The influence of external conditions on the characteristics of long-period structures (LPS) is considered: the temperature influence on the stabilization of the ordered structure with periodic antiphase boundaries is taken as an example. The study is carried out in terms of the phenomenological model which associates…
MoTe2 layers are obtained by solid state reactions – induced by annealing – between the Mo and Te constituents in the form of thin films, sequentially deposited (Mo/Te/…/Mo). The films are investigated by X-ray diffraction analysis, scanning and transmission electron microscopy (SEM, TEM), photoelectron spectroscopy (…
The temperature dependence of strain rate sensitivity is investigated superimposing an ultrasonic oscillatory stress during the plastic deformation of KCl single crystals doped with monovalent impurities, Br− and I−. The effective stress due to monovalent weak obstacles which lie on the mobile dislocation with largest…
Interplanar and intraplanar spacings as well as the elastic constants of fcc/fcc metallic multilayers stacked along [001] were determined via variable-cell molecular-dynamics simulation in (HtN) and (EhN) ensembles at room temperature. Qualitative differences in the structural and elastic properties of the multilayers…
The successive cubic-tetragonal-orthorhombic-rhombohedral phase transitions in BaTiO 3 are discussed quantitatively from the microscopic free energy based upon the mean field approximation, where the Ti ions shift in the lattice having the spontaneous deformation. It is shown that the effect of the spontaneous lattice…
Infrared absorption in composite films of ${\mathrm{SiO}}_{2}$ and microcrystalline Ge has been investigated with p- and s-polarized light under 45\ifmmode^\circ\else\textdegree\fi{} oblique incidence. In the case of p-polarized incident light, pure ${\mathrm{SiO}}_{2}$ films clearly exhibit an absorption peak of the…
We have investigated the structure of molecular-beam-epitaxy-grown CuO thin films on MgO substrates using reflection high-energy electron diffraction, x-ray diffraction, and high-resolution electron microscopy (HREM). The results show that CuO(111) planes grow parallel to (001)MgO planes. Three main in-plane epitaxial…
We study the electronic structure of K adlayers on graphite using a simplified tight-binding model in the coverage (\ensuremath{\Theta}) range between 0.01 and 1.0 monolayers. We find that the coverage dependence of the K adsorption energy at low \ensuremath{\Theta} arises mainly from the band-energy change reflecting…
Abstract Blends of polyamide 6 (PA6) and polycarbonate (PC) were prepared in a Brabender mixer, at 240°C, applying long mixing time, for 45 min. It was observed that the morphology and the mechanical properties tend to resemble those of a homogeneous material as the mixing time and PA6 concentration increase. This is…
A method for microfabrication of three-dimensional structures in free space is presented. Laser-assisted chemical vapor deposition is used to grow a material at a point where a laser beam locally heats the substrate. By moving the substrate relative to the laser beam with a micropositioning system, three-dimensional s…
The speed of automatic optimization procedures used in surface structure determination by low-energy electron diffraction can be greatly enhanced by the use of linear approximations in the calculation of scattering amplitudes. It is shown how linear approximations can be used in the calculation of derivatives of inten…
The NAD(+)-dependent alcohol dehydrogenase (EC 1.1.1.1) from the thermoacidophilic archaebacterium Sulfolobus solfataricus, DSM1617 strain (SSADH), has been purified and characterized. Its gene has been isolated by screening two S. Solfataricus genomic libraries using oligonucleotide probes. The encoding sequence cons…
Abstract The surface compositions of a series of poly(phenylene ether)/nylon 6,6 blends (PPE/PA), and PPE/HIPS blends, prepared by melt compounding and injection molding, have been quantitatively measured using XPS. For PPE/PA blends, the surface is dominated by the PA component for blends containing more than 25 wt %…
Na 0.5 Bi 0.5 MoO 4 (I), I4 1 /a, a=5.2717,c=11.5801A, R p =4.06%. Na 0.32 Bi 0.56 MoO 4 (II), I4 1 /a, a=5?2785, c=11.6410A, R p =4.82%. Na 0.5 Ce 0.5 MoO 4 (III), I4 1 /a a=5.31167, c=11.6600A, R p =12.34%. Na 0.5 La 0.5 MoO 4 (IV), I4 1 /a, a=5.3424, c=11.7376A, R p =10.82%.
A theoretical model for nuclear magnetic resonance (NMR) observables of noble gas atoms in nematic and smectic A liquid crystal environments is developed. It is used to account for the behavior of the nuclear shielding of 129Xe (σ) and the quadrupolar coupling of 21Ne (B) measured in 1-butyl-c-4-(4′-octylbiphenyl-4-yl…
The ZGB model [Ziff et al., Phys. Rev. Lett. 56, 2553 (1986)] for a monomer–dimer surface reaction process of the type A+(1/2)B2→AB, exhibits two irreversible phase transitions (IPT) from a stationary regime with AB production for p1A≤pA≤p2A, to poisoned states with B (A)-species for pA≤p1A (pA≥p2A), respectively, whe…
We construct an expression for the free energy of an incompressible binary blend of homopolymers in the vicinity of a hard reflecting surface. Expressed as a functional of the concentration profile away from the surface, we find a contribution to the free energy that is linear in the gradient of the concentration and…
Abstract The structural changes of silk fibers induced by heat treatment were investigated by thermomechanical analysis, dynamic mechanical measurements, X‐ray diffraction analysis, and refractive indices measurements. Bombyx mori silk fibers exhibited only a slight contraction, while tussah silk fibers showed a promi…
Seven hydrophobic residues ranging in size from glycine to phenylalanine have been substituted for the wild-type methionine residue at position 13 in a 15-residue truncated version (S15) of S-peptide, the small component of ribonuclease S. Complexes of both S-15 and the seven variants with S-protein yielded isomorphou…
We report detailed measurements of the temperature dependence of the electrical resistivity and Seebeck coefficient for ${\mathrm{PrNiO}}_{3}$ with particular attention to the metal-insulator (MI) transition (${\mathit{T}}_{\mathrm{MI}}$\ensuremath{\approxeq}130 K). The Seebeck coefficient in the metallic and semicond…