New and rare diatoms from Oregon and Washington
(Uploaded by Plazi from the Biodiversity Heritage Library) No abstract provided.
Materials Literature
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Elektrische Untersuchungen an „zusatzfreien” Zinndioxydschichten hoher Elektronenkonzentration im Temperaturbereich zwischen 90 °K bis etwa 290 deg;K
Abstract Es wird über elektrische Untersuchungen an „zusatzfreien”︁ Zinndioxydschichten mit spezifischen Leitfähigkeiten zwischen 10 −1 bis etwa 3 · 10 2 Ω −1 bzw. mit Elektronenkonzentrationen zwischen 10 18 bis 2 · 10 20 cm −3 berichtet. Die Schichten wurden nach dem Gaszersetzungsverfahren hergestellt. Bei Zimmerte…
Rydberg Function as an Interatomic Potential for Metals
The Rydberg potential has been applied to a number of body-centered and face-centered cubic metals. The parameters of the potential were calculated using the experimental values for the energy of vaporization, the lattice constant, and the compressibility. Results have been obtained for the elastic constants, for the…
Effects of Diffusion from Brass Substrates into Electrodeposited Tin Coatings on Corrosion Resistance and Whisker Growth
SummaryTin coatings electrodeposited direct on brass have an initial trace zinc content which makes them liable to tarnish in atmospheres containing sulphur dioxide. When more zinc reaches the surface by diffusion from the substrate, susceptibility to corrosive agents increases. Undercoats of copper or nickel are effe…
Relation Between Ionic Radii and Transformation Temperature in Rare Earth Niobates
Abstract In this work a detailed X-ray powder diffraction study of the reversible temperature transformation has been undertaken in several rare earth niobates MNbO 4 M being lanthanum, cerium, neodymium, gadolinium, holmium, thulium, ytterbium, and yttrium. Both high-temperature diffractometer and film techniques wer…
Über die Reaktion von Glykolen mit der olefinischen Doppelbindung bei der Darstellung von ungesättigten Polyestern durch Schmelzkondensation
Abstract Bei der Polykondensation des Maleinsäureanhydrids bzw. der Malein‐ oder Fumarsäure mit Äthylenglykol wurde dessen Anlagerung an die Doppelbindung des ungesättigten Dicarbonsäurebausteins und die Bildung von 1‐(2‐Hydroxyäthoxy)‐äthan‐1,2‐dicarbonsäure bzw. deren Ester nachgewiesen. Die Anlagerung ist nicht nur…
A Comparison of the Intensities of Emission of Eu3+ and Tb3+ in Tungstates and Molybdates
The intensity of emission of Eu 3+ is shown to vary with its electrostatic binding energy in the tungstates which have the scheelite structure. Increasing the polarization of the oxygens toward Eu 3+ or Tb 3+ appears to decrease the total binding energies of these ions in the tungstates and molybdates. Brightness can…
PHASE TRANSFORMATIONS IN TITANIUM AND ITS ALLOYS
Interest in titanium-base alloys as structural materials has inspired many studies of their phase relationships. These have provided the background essential to the development of commercial alloys, but have also revealed some unexpected, and still to some extent unexplained, aspects that are of considerable scientifi…
Dielectric information on chain mobility, chain configuration, and an order-disorder transition in amorphous polyacetaldehyde
G. Williams, Trans. Faraday Soc., 1963, 59, 1397 DOI: 10.1039/TF9635901397
Phase Transitions in Sodium Tungsten Bronzes
The reported structures of tungsten bronzes include cubic, pseudocubic, tetragonal, orthorhombic, and monoclinic distortions of the perovskitetype structure; well-characterized tetragonal and hexagonal structures, as found in the series K x WO 3; and some unit cells which are reported for isolated phases. This work su…
Color Centers in Quartz Produced by Crushing
Abstract Results are presented for electron spin resonance measurements carried out at room temperature on freshly powdered high purity quartz and fused silica. As a result of the powdering, unpaired electrons are produced in concentrations of 10 14 to 10 15 per gram, depending on the particle size. The thermal stabil…
On Variance as a Measure of Line Broadening in Diffractometry II: Mistakes and Strain
If J ( t )- iK ( t ) is the mean value of FF * for cells separated a distance t in the hkl direction, the mean-square broadening due to mistakes is W 2θ = - [λΔ(2θ) / 2π 2 cos θ] × [ J '(0) / J (0)] - [λ 2 / 4π 2 cos 2 θ] [ J ''(0) / J (0) + { K '(0) / J (0)} 2 ] where Δ(2θ) is the range of 2θ used in evaluating W 2θ…
Beitrag zur deutung des infrarotspektrums von nylon 6,6
Abstract Durch Grenzflächenpolykondensation wurde aus Hexamethylendiamin‐1,1,6,6,N,N′‐D 8 bzw. Adipinsäuredichlorid‐2,2,5,5‐D 4 Nylon 6,6 hergestellt, das in α‐Stellung zur Amidgruppe spezifisch auf der Amin‐ oder Säureseite (N‐vicinal und CO‐vicinal) deuteriert ist. Mit Hilfe der Infrarotspektren der aus diesen Probe…
916. Low-temperature magnetic properties of some uranium oxides
M. J. M. Leask, L. E. J. Roberts, A. J. Walter and W. P. Wolf, J. Chem. Soc., 1963, 4788 DOI: 10.1039/JR9630004788
Ordered Phases and Nonstoichiometry in the Rare Earth Oxide System
Stable phases in the rare earth oxide systems are tabulated and discussed. New data on the structure of sesquioxides quenched from the melt are reported. The structural interrelations between the A, B, and C type sesquioxides and the fluorite dioxides are pointed out. The sequences of several intermediate oxides in th…
Optical and Electrical Properties of Semiconducting Cadmium Oxide Films
Indium‐doped, copper‐doped, and undoped cadmium oxide films were prepared by reactive sputtering. The oxygen vacancy concentration in these films was changed by varying the oxygen pressure in the sputtering chamber. Electrical properties, spectral transmittance, and Hall effect were measured on doped and undoped speci…
Stress Generation in Tantalum During Oxidation
Thin rectangular specimens of tantalum were oxidized on one side at 500°C and 1 atm oxygen pressure. From curvature measurements, the bending stresses arising as a consequence of the oxidation process were determined and correlated with known oxidation rate behavior and oxide morphology. The simplest stress model, tha…
Energy Dependence of Product Yields in Copper Spallation by Protons between 3 and 30 GeV
Careful comparisons of cross sections for formation of 19 products of copper spallation by 3- and 30-GeV protons indicate only a small energy dependence in this energy range. As the energy is increased from 3 to 30 GeV, products of $A>40$ decrease in yield by 15% or less, except for some highly neutron-deficient sp…
ELECTROTRANSPORT IN METALS
When an electric field is applied to a metal, in addition to the transport of electrons, a relatively small transport of the metal ions also occurs. This process of mass transport of metal ions is sometimes referred to as electromigration or electrodiffusion, and will be referred to in this review as electrotransport.…
The Fabry-Perot Electrooptic Modulator
The Fabry-Perot modulator, consisting of Fabry-Perot etalon plates separated by an electrooptic material such as KDP, is analyzed in detail. Time-dependent perturbation theory is used to describe the coupling of the axial modes by spatial and time varying perturbations in the dielectric constant. The perturbations are…