Materials Literature
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The energy dispersion of conduction (or unoccupied) bands of graphite has been studied by angle-resolved ultraviolet photoelectron spectroscopy. Photoemission peaks originating in the conduction bands were successfully separated from those of the valence bands by comparing two sets of angle-resolved ultraviolet photoe…
The increase in the current that flows in a negative point-to-plane corona discharge when a porous layer is present on the plane was studied by using a fast storage oscilloscope. It was found that the current increase is due primarily to an increase in the frequency of the Trichel pulses at the cathode, and less than…
Absorption and cathodoluminescence spectra have been obtained from synthetic diamonds which have been heated at temperatures between 1700 and 2400 degrees C to produce various degrees of nitrogen aggregation. At the lower temperatures a number of optical centres attributed to nitrogen in intermediate stages of aggrega…
During the impact of an elastic sphere on an elastic, massive, substrate some of the kinetic energy is radiated into the massive substrate as elastic waves and is not available for subsequent recovery as kinetic energy. This loss of recoverable energy then determines the maximum possible value for the coefficient of r…
Thomas R. Loughlin, Michael A. Perez; Mesoplodon stejnegeri, Mammalian Species, Issue 250, 13 December 1985, Pages 1–6, https://doi.org/10.2307/3503801
The principle radiation damage effects occurring in optical materials, particularly those produced by energetic particles and gamma rays, are described phenomenologically. Included is a description of the basic processes whereby radiation interacts with non-metals. Emphasized are: 1) ionization induced electron and ho…
The optical properties of fiber waveguides can be degraded by exposure to nuclear radiation, primarily through the generation of color centers in the fiber core. This paper will review recent studies of the radiation-induced absorption in state-of-the-art fiber optics. Particular emphasis is placed on the development…
The natures of radiation-induced defects and defect generation processes in optical glasses are critically reviewed. Materials of interest here include silica, silicates, and fluorides, hence encompassing glasses now in use or contemplated for fiber optics, lenses, mirrors, windows, and other optical applications. The…
The tracer diffusion coefficient is investigated for a correlated diffusion of a tracer, which is a particle of the lattice gas. The lattice gas consists of particles of arbitrary concentration hopping on a two-dimensional honeycomb lattice, which interact only as repulsing point hard cores. Exchange between different…
The low-temperature ferroelectric-paraelectric phase transition occurring in lead scandium tantalate (PbSc 1 2/Ta 1 2/O 3 ) has been investigated by X-ray diffraction. The symmetry of the low-temperature phase is shown to be rhombohedral and the lattice parameters are given over the temperature range 30-300K. The atom…
The phase behavior of multicomponent polymeric materials is a crucial factor in determining their physical properties and subsequently their utility. For systems forming separate phases, the important issues are phase morphology (size and shape) and the nature of the interface (wetting and adhesion) between phases. Fo…
This report was produced by a scientific committee of eight members, chaired by Richard C. McCall. It is a reference manual dealing with the problem of neutron production that results from the operation of high-energy electron linear accelerators used in radiation therapy. As radiation therapy becomes more sophisticat…
A model for the paramagnetic ${E}_{2}^{\ensuremath{'}}$ center in alpha quartz is tested by means of semiempirical molecular-orbital calculations. The ${E}_{2}^{\ensuremath{'}}$ center is proposed to be a variant of the ${E}_{4}^{\ensuremath{'}}$ center (a hydrogen atom substituted for an oxygen atom) with one silicon…
Resume- On passe en revue des donn6es sur la structure d'un certain nombre de solides amorphes repr6sentatifs- m6taux purs et semiconducteurs, alliages amorphes et verres d'oxydes- et on se propose de sugggrer quels sont les modbles les plus adkquats. Historiquement, les empilements denses algatoires…
Abstract With highly orientd and isotropic samples of iostactic polypropylene the thermo‐oxidative stability in air and in fumic nitric acid was studied. The rate of chain scission was found to be higher with isotropic than with oriented samples. Thermo‐oxidation in air and etching of amorphous regions leads to format…
X-ray absorption spectra of Fe and Ni K edges have been obtained at room temperature by means of a total electron yield technique for a clean Fe foil on which Ni was subsequently deposited, and a Ni foil. This technique involves the measurement of the specimen current. The total yield is found to be ∼1×10−2 electron p…
Audio frequency complex admittance has been used to investigate electrical relaxation in poly(ethylene oxide). The complex admittance measurements were performed at seventeen frequencies from 10 Hz to 100 kHz in approximately equal logarithmic intervals using a fully automated dielectric spectrometer and measurements…
The dislocation-enhanced Snoek effect - DESE in nitrogen doped iron is reported. The nitrogen DESE shows similar properties as already reported carbon DESE in iron. Thermal instability of the DESE in iron is clearly shown. A general discussion on the DESE in bcc metals is given.
Abstract Die bisher unbekannte Verbindung Cu 6 Mo 5 O 18 wurde in einkristalliner Form dargestellt und röntgenographisch untersucht (a = 18,884(19), b = 6,273(7), c = 15,259(23) Å, β = 130,40(5)°, Raumgruppe C –C2/c, Z = 4). Die charakteristischen Strukturmerkmale werden beschrieben und im Zusammenhang mit Oxocupraten…
Abstract The colourless com pound NaLiS has been prepared and its structure determined by single crystal X-ray diffraction techniques. The very hygroscopic NaLiS crystallizes in the tetragonal space group P4/nmm (Z = 2) with the cell parameters a = 402.6(1), c = 649.5(2) pm. The structure was solved from 720 counter r…