Materials Literature
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The report supplies the theoretical background and design techniques needed by an engineer who is designing electrical insulation for high-voltage high-power components, equipment, and systems on aircraft. A literature survey and abundant bibliography identify references that provide further data on the subjects of pa…
The crystal structure of Cs2HfCl6 was determined to be cubic, Fm3m, similar to K2PtCl6, with parameters: a0 = 10.42±0.01 Å, and u = 0.247±0.003. Powder diffraction data on which the determination was based are given.
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The Tintinnida of the Woods Hole, Massachusetts region were identified during two consecutive summers; loricae of eleven species of the agglutinated variety were studied by scanning electron microscopy. There were distinct differences in the types of particles utilized. In some species, quartz was incorporated almost…
Abstract The kinetics of crystallization of alumina trihydroxide (hydrargillite) from caustic aluminate solutions of industrial composition (second stage BAYER process) were studied in a laboratory batch isothermal crystallizer. The yield and crystal size distribution of precipitate with time were obtained by varying…
Abstract Three soil profiles developed on a serpentinite body (La Rochel'Abeille, near Limoges) show three stages of weathering. All soils contain iron-rich smectites and secondary chlorites. The latter are very silica-rich, more so than 14 Å chlorites from crystalline rocks. In the (B) 1g horizon of the hydromorphic…
New intermetallic compounds of the ThCr 2 Si 2 -structure type have been prepared and their structures determined by single crystal data.
Fe2SiS4 and Fe2GeS4 have the olivine structure with space group Pnma. Cell dimensions are a= 12.407 (2), b=7.198(1), c= 5.812(1) /~ for Fe2SiS4 and a= 12.467(2), b=7.213(1), c= 5.902(1) /~ for Fe2GeS4. The crystal structures were refined by least squares to final values of R=0.052 and 0044 respectively for Fe2SiS4 and…
Abstract not Available.
The simple method of solving the Green-Ampt one-dimensional infiltration equations developed from Darcy's law are proposed for practical applications. The explicit solution is an approximation obtained by employing a power series expansion of the logarithmic term. The maximum error resulting from applying this simple…
Abstract Darstellung und Einkristallzüchtung der schwer zugänglichen Verbindung Cs 4 O werden beschrieben. Die bei −30°C durchgeführte Strukturuntersuchung ergibt einen Aufbau gemäß der Formel [Cs 11 O 3 ]Cs. Die für Cäsiumsuboxide charakteristischen Cs 11 O 3 ‐Gruppen bilden eine hexagonal dichte Anordnung, in der di…
Summary Extraction of five soils with acetylacetone in benzene does not change their particle‐size distribution, compared with no pre‐treatment or dispersion, but it decreases the water stability of soil aggregates. The decrease is closely related to the extent of the extraction of iron and aluminium by acetylacetone…
Na 3 NO 3 ist kein Salz der „orthosalpetrigen Säure”︁ H 3 NO 3 , sondern ist als Addukt [NO 2 − ]ONa 3 zu formulieren. Zu diesem Ergebnis führte die Röntgenstrukturanalyse, die keine NO 3 3− ‐Anionen erkennen ließ magnified image .
Abstract The amide‐exchange reactions which cause copolymer formation in polyamide melt blends were studied with mixtures of N ‐ethylcaproamide and N ‐hexylacetamide containing small concentrations of caproic acid and hexylamine as a model system for melt blends of aliphatic polyamides. Amide exchange was found to inv…
Revue bibliographique sur l'analyse des structures stratifiees dans lesquelles des couches de materiau viscoelastique sont utilisees pour l'amortissement des vibrations
This paper describes test methods used to study the phenomenon of electrical treeing in solid dielectrics. Measurements of double needle characteristic voltage and voltage life for a variety of useful dielectric materials are presented. The effects of additives upon treeing in polyethylene are discussed, and evidence…
Some physical, catalytic, and regulatory properties of ketopantoate hydroxymethyltransferase (5,10-methylenetetrahydrofolate: alpha-ketoisovalerate hydroxymethyltranferase) from Escherichia coli are described. This enzyme catalyzes the reversible synthesis of ketopantoate (Reaction 1), an essential precursor of pantot…
The 11B and 207Pb NMR spectra have been used to study the structure of glasses in the system PbO–B2O3–SiO2. The results indicate that the glasses do not contain an appreciable number of BO−3 units, and the network-forming lead atoms play an important role in the compositional behavior of N4 (the fraction of boron atom…
A number of local potentials have been suggested to represent the non-local exchange kernel in electron-atom scattering. A comparative numerical study has been made in which phase shifts for the elastic scattering of electrons by H, He+ and He using these potentials are tested against those calculated from the exchang…
New measurements of electrical conductivity along the $b$ axis of tetrathiafulvalenium-tetracyanoquinodimethanide (TTF-TCNQ) are combined with published results to provide a comprehensive summary including approximately 600 samples studied at 18 different laboratories. The magnitudes of these measured conductivities d…