Mesoplodon stejnegeri
Thomas R. Loughlin, Michael A. Perez; Mesoplodon stejnegeri, Mammalian Species, Issue 250, 13 December 1985, Pages 1–6, https://doi.org/10.2307/3503801
Materials Literature
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Overview Of Nuclear Radiation Damage Processes: Phenomenological Features Of Radiation Damage In Crystals And Glasses
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…
Overview Of Radiation Effects In Fiber Optics
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…
Nature Of Defects And Defect Generation In Optical Glasses
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…
Correlated hopping in honeycomb lattice: tracer diffusion coefficient at arbitrary lattice gas concentration
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…
Low-temperature studies of ferroelectric lead scandium tantalate
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…
Multicomponent Polymer Materials
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…
Neutron Contamination From Medical Electron Accelerators
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…
Model for theE2′Center in Alpha Quartz
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…
THE STRUCTURE OF AMORPHOUS SOLIDS - A PERSPECTIVE VIEW
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…
Thermo‐oxidative stability of oriented polypropylene films
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…
Total electron yield measurements of extended x-ray absorption fine structures (EXAFS) of Ni and Fe thin foils, and adsorption of Ni on polycrystalline Fe substrates
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…
Electrical Relaxation in Pply(Ethylene Oxide)
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 IRON
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.
Synthese und Kristallstruktur von Cu6Mo5O18
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…
NaLiS: Ein weiteres Interalkalimetallsulfid / NaLiS: A nother Inter Alkaline Metal Sulphide
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…
SHAPE GENERALIZED ISOTHERMAL EFFECTIVENESS FACTOR FOR FIRST-ORDER KINETICS
A generalized effectiveness factor equation (Eq. (32)), in terms of modified Bessel functions, is derived for a catalyst pellet of arbitrary shape. The derivation is based on utilizing an appropriate one-dimensional approximation for the Laplacian in an arbitrary shaped body subjected to a uniform external concentrati…
QUASIPERIODIC PATTERNS
We present a theory of quasiperiodic tilings and more general quasiperiodic patterns with long range orientational order. We explain our "strip method" (a variant of the projection methods) on a one dimensional model. Then the icosahedral case is investigated in view of the quasicrystals of the type Al-Mn. Our method…
THE GENUS THALASSIOSIRA (BACILLARIOPHYCEAE): MORPHOLOGY OF HETEROVALVATE RESTING SPORES OF T. SCOTIA
Resting spores of Thalassiosira scotia Fryx. et Hoban were abundant in phytoplankton net hauls collected from the Scotia Sea south of South Georgia in December 1981. Primary valves are distinguished from secondary valves by the presence of marginal striae with rounded, shoelike protrusions, villi surrounding marginal…
Nature of the staging transformation in graphite intercalation compounds
We suggest that the staging transformation in graphite intercalation compounds takes place through metastable, partly disordered states. A specific mechanism, involving nucleation of defect sandwiches of stage n\ifmmode\pm\else\textpm\fi{}1 in the stage-n phase, is proposed. We predict that the staging disorder is ass…