Crystal structure of sodium lanthanum orthovanadate, Na3La(VO4)2
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STUDIES ON THE SIZES, SHAPES, AND THE DEVELOPMENT OF THE LORICA OF AGGLUTINATED TINTINNIDA
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…
Alumina trihydrate crystallization. Part 1. Secondary nucleation and growth rate kinetics
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…
Smectite, chlorite and a regular interlayered chlorite-vermiculite in soils developed on a small serpentinite body Massif Central, France
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…
Notizen: Neue Verbindungen AB2X2 (A = Erdalkalimetall, B = Übergangselement, X = Element(IV)) im ThCr2Si2-Typ / New Compounds of the ThCr2Si2-Structure Type
New intermetallic compounds of the ThCr 2 Si 2 -structure type have been prepared and their structures determined by single crystal data.
Polyhedral deformations in olivine-type compounds and the crystal structure of Fe2SiS4 and Fe2GeS4
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…
Effect of Water on Beta Alumina Conductivity
Abstract not Available.
Solutions to Green-Ampt Infiltration Equation
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…
Über Alkalimetallsuboxide. VIII. Untersuchungen zum Aufbau von Tetracäsiumoxid
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…
IRON AND ALUMINIUM AS CEMENTING SUBSTANCES OF SOIL AGGREGATES
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…
Na3NO3 — kein Orthonitrit
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 .
Amide‐exchange reactions in mixtures of N ‐alkyl amides and in polyamide melt blends
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…
Vibration Control With Viscoelastic Materials
Revue bibliographique sur l'analyse des structures stratifiees dans lesquelles des couches de materiau viscoelastique sont utilisees pour l'amortissement des vibrations
Laboratory studies of treeing in solid dielectrics and voltage stabilization of polyethylene
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…
Ketopantoate hydroxymethyltransferase. II. Physical, catalytic, and regulatory properties.
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…
Nuclear magnetic resonance studies of the glasses in the system PbO–B2O3–SiO2
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…
Equivalent exchange potentials in electron scattering
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…
Electrical conductivity of tetrathiafulvalenium-tetracyanoquinodimethanide (TTF-TCNQ)
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…
A study of foam extrusion using a chemical blowing agent
An experimental study of foam extrusion was carried out to determine the effect of processing variables on the quality of the foam produced. For the study, the chemical blowing agent azodicarbonamide was used, together with an activator and a nucleating agent, to produce thermoplastic foams of low-density polyethylene…
SIMPLE SYNTHESIS OF THE CONTINUOUS SiC FIBER WITH HIGH TENSILE STRENGTH
Abstract A polycarbosilane, the starting material of β-SiC fibers, was prepared without autoclave. The new method is simple and more economical than the previous one. Furthermore, a great number of bundles of SiC fibers were obtained by way of oxidative reactions of polycarbosilane fibers.