Materials Literature
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A woven, double velour Dacron vascular graft was made nonporous by coating it with a layer of collagen prepared from fresh, young calf skin. Grafts were implanted in the thoracic aorta of 24 mongrel dogs and were examined at intervals up to 180 days. The grafts did not require preclotting or special preparation before…
Absolute electron scattering cross sections for argon, krypton and xenon have been measured at low electron energies using the powerful technique of photoelectron spectroscopy. The measurements have been carried out at electron energies varying from 0.7 to 10 eV with an accuracy of +or-2.7%. The cross sections obtaine…
We report the first observation of the absence of the photodarkening (PD) effect in bulk chalcogenide glasses. In the prototype systems ${\mathrm{Cu}}_{\mathrm{x}}$(${\mathrm{As}}_{0.4}$${\mathrm{S}}_{0.6}$${)}_{1\mathrm{\ensuremath{-}}\mathrm{x}}$ and ${\mathrm{Cu}}_{\mathrm{x}}$(${\mathrm{As}}_{0.4}$${\mathrm{Se}}_{…
Thin epitaxial layers of Ge-Si alloys have been formed on Si(100) substrates by steam oxidation of Ge-implanted samples. During the oxidation, the Ge is totally piled up ahead of the SiO2/Si interface. This segregation of Ge leads to the formation of a distinct, Ge-rich layer which is epitaxial with the underlying Si.…
Resonant Raman spectroscopy has been used to study amorphous hydrogenated carbon films. For films containing both sp2 and sp3 bonded carbon a well-defined high-frequency shift of the main Raman peak is observed with increasing exciting photon energy. This shift is interpreted in terms of scattering from π-bonded carbo…
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During recent measurements of thermal conductivity using the transient hot-wire method, data were obtained for pressure-temperature coordinates corresponding to transitions amongst phases I, II, III and IV and NH 4 I which extended reliable knowledge of the phase diagram to pressures of 2 GPa. Comparison of the phase…
A detailed account is given of the matching procedure devised to calculate surface phonon and resonance dispersion curves. Each kind of phonon symmetry is studied separately. A secular equation is first derived which is shown to contain in particular all the information on the dispersion curves and density of states o…
The narrow-band noise (NBN) in the charge-density-wave conductor ${\mathrm{NbSe}}_{3}$ is found to fluctuate dynamically in frequency, amplitude, and harmonic content. The NBN width is dominated by slow frequency fluctuations rather than a spatial velocity distribution. Mode locking quenches these fluctuations yieldin…
Optical properties of β-Bi2O3 films prepared by activated reactive evaporation are studied from 0.5 to 3.5 eV. It is shown that β-Bi2O3 is an indirect band gap semiconductor with a band gap of (1.74 ± 0.5) eV and the optical transition leading to this is an allowed one. The direct gap of β-Bi2O3 is 2.6 eV.
Several high-intensity synchrotron x-ray sources have been constructed over the past few years in the United States, West Germany, Great Britain, Japan, France, Italy, and the Soviet Union. Crystallographers have begun to use these facilities for experiments that take advantage of the characteristics of synchrotron ra…
The structure and magnetic properties of equiatomic FeCo alloys with ternary additions of up to 1.92 at% Nb and 6 at% V are studied by means of Mössbauer spectroscopy, complemented with light and electron microscopy and the determination of magnetisation curves, as function of heat treatment. The main features of the…
New germanates with the NdAlGe2O7-type structure are synthesized. The Czochralski method is used to grow LaGaGe2O7: Nd3+ single crystals and the full concentration series of Gd1−xNdxGaGe2O7 crystals. The GdGaGe2O7 crystal structure is refined. The absorption–luminescence properties of the grown crystals have been stud…
β-CuCNS, a three-dimensional polymeric solid with interbonded layers is found to have unusual photoelectrochemical and solid state properties. The material becomes p- or n-type depending on whether CNS or Cu in stoichiometric excess. The n-type is found to be sensitive to the visible spectrum. The methods of preparati…
Ca(CH 3 COO) 2 •H 2 O cristallise dans le systeme triclinique avec le groupe d'espace P1. Affinement de la structure jusqu'a 0,029
We study the collective excitations of an array of two-dimensional electron-gas layers arranged in a Fibonacci sequence. The plasmon spectrum is calculated using a transfer-matrix method. It is demonstrated that the spectrum is critical. Global scaling properties of the spectrum are discussed. The infrared resonant ab…
XPS and UPS techniques have been used to characterize electrochemically grown conductive films using two different solvent systems of poly (3-methyl thiophene) in the PF6 doped and undoped states. Core-level and valence-level spectra have yielded information on the nature of the polymeric cation and its associated PF6…
Coupled surface plasmons in a thin free-standing metal film with both the interfaces periodically corrugated are studied. Infinite Rayleigh expansions in terms of the spatial harmonics with proper boundary conditions are used to obtain the infinite hierarchy of coupled amplitude equations. The truncated system of equa…
The alternating copolymer of vinylidenecyanide and vinyl acetate is the first amorphous polymer to show a combination of excellent properties among the several known piezoelectric polymers, e.g., high piezoelectric activity (d31=7 pC/N), high electromechanical constant (kt=0.38), and high thermal stability (glass tran…