Materials Literature
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The line shapes of multiplet components of the complex x-ray photoemission spectra of the Ta $4f$ core levels in $1T$- and ${4H}_{b}$-Ta${\mathrm{S}}_{2}$ are shown to have different asymmetries associated with the charge density wave induced differences in the densities of states at distinct Ta sites which produce si…
Pseudopotential models are used to study large strain, axial loading of the alkali metals. Various bcc $\phantom{\rule{0ex}{0ex}}\ensuremath{\rightleftarrows}\phantom{\rule{0ex}{0ex}}$fcc transitions are found to be associated with bifurcations from primary to secondary branch paths, under strict uniaxial load. Theore…
Cohesion properties between carbon nanotubules and potassium atoms are studied using a first-principles total-energy and band-structure approach. The present calculations which assume linearly aligned arrangements of K atoms inside and outside of tubules suggest that the classical wetting picture of capillary action i…
Erratum to Europhys. Lett. 27 (9) 661-666 (1994).
A simple, local cluster interaction is presented, which has as (only) ground states perfectly quasicrystalline tilings from a single local isomorphism class. Since these tilings do not allow for any perfect matching rules, it is thereby shown that the class of structures which are the ground state of some finite range…
The effect of phorbol ester on the synthesis of nitric oxide (NO) in murine microglial cells was examined. Phorbol 12-myristate 13-acetate (PMA), a protein kinase C (PKC) activator, alone had no effect, whereas PMA with recombinant interferon (rIFN)-gamma synergistically increased NO synthesis in murine microglial cel…
Rat 3-hydroxyisobutyrate dehydrogenase shares sequence homology with the short-chain alcohol dehydrogenases. Site-directed mutagenesis and chemical modifications were used to examine the roles of cysteine residues and other residues conserved in this family of enzymes. It was found that a highly conserved tyrosine res…
Abstract We have studied the deposition of thin films of a conducting polymer, polypyrrole, onto printed circuit boards (PCBs). Film formation occurs as a result of the in situ polymerization of pyrrole monomer using a 1 : 1 FeCl 3 /5‐sulfosalicylic acid oxidant complex in aqueous solution. We have optimized the polym…
Abstract Compatibility of a crystalline/crystalline polymer blend, poly(vinyl alcohol) (PVA)/poly(3‐hydroxybutyrate) (PHB), was studied by high‐resolution solid‐state 13 C‐NMR spectroscopy. The 1 H T 1 measurement demonstrated that both the compatibility and the domain size depend on the composition of the blend. The…
We have studied the secondary structure of native phospholamban (PLB), a 52-residue integral membrane protein that regulates calcium uptake into the cardiac sarcoplasmic reticulum, as well as its 27-residue carboxy-terminal transmembrane segment (PLB26-52). The relative contents of alpha-helix, beta-strand, and random…
Abstract A new family of bioabsorbable materials suitable for biomedical applications was designed and prepared by means of blending of some available polyesters to develop new biodegradable materials tailored for different requirements. Multiphase polymer blends containing poly( d, l ‐lactide) (PLA), poly(ε‐caprolact…
Using neutron scattering, we have studied the effect of an applied magnetic field on the nematic-isotropic transition temperature ${T}_{c}$ in para-azoxy-anisole (PAA). We have, for the first time, been able to measure a thermal hysteresis width, $({T}_{+}^{*}{\ensuremath{-}T}_{\ensuremath{-}}^{*}){/T}_{c}$, and find…
Detailed measurements of the X-ray scattering from a 400 AA thin film of Nb grown on sapphire have been performed using synchrotron radiation from a bending magnet. Bragg reflections from Nb planes perpendicular to the surface normal have a two-component lineshape: a sharp, essentially resolution-limited peak, superim…
Highly textured strontium barium niobate thin films were deposited in situ by low pressure metalorganic chemical vapor deposition. [001]-oriented strontium barium niobate films on single crystal (100) magnesium oxide substrates were obtained at a growth temperature of 800 °C. Second-harmonic generation of 1.064 μm inc…
Tungsten oxide films were made by magnetron sputtering with a large angle between the substrate normal and the direction of the deposition flux. Scanning electron microscopy displayed a microstructure composed of inclined columns. Spectrophotometric measurements on films with different amounts of electrochemically int…
The electron paramagnetic resonance (EPR) spectrum of the neutral phosphorus vacancy has been observed in as-grown ZnGeP2 during illumination at liquid-helium temperatures. Without illumination, this donor is a nonparamagnetic singly ionized phosphorus vacancy (VP+ center). Either above-band-gap light (514.5 nm) or be…
The dynamical behavior of nematic and smectic- $A$ ordering of a liquid crystal in an aerogel host is studied by quasielastic light scattering. In the nematic phase, ordered domains are comparable to the pore size and generally frozen in orientation, with remnant orientation fluctuations having paranematic dynamics fo…
All-perovskite ferroelectric field effect transistors (FET) are proposed, and switching behaviors of the prototype devices having a (Pb,La)(Zr,Ti)O3 as a gate insulator and a La1.99Sr0.01CuO4 as a channel layer were demonstrated. Marked improvements in device performances were obtained as compared with the previous fe…
Abstract Recent studies of foam-diversion processes for matrix acidization identify gas trapping during post-foam liquid injection as the key to foam effectiveness. Laboratory studies identify two degradation processes during this period: a rapid increase in mobility throughout the core, followed by a slower further r…
The corrosion behaviour of two superferritic stainless steels, both containing varying amounts of ruthenium, was evaluated and compared in a 10% sulphuric acid solution. It was found that small additions of ruthenium increased the corrosion resistance in both types of alloys dramatically. Apart from raising the corros…