Materials Literature
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Constitutional studies of three polysaccharides prepared from Serratia marcescens cells by a sequence of phenol extraction, ultracentrifugation, and fractionation by Cetavlon are described. Methylation of the polysaccharides followed by acid hydrolysis yielded 2,3,4,6-tetra-O-methyl-D-glucose, 2,4,6-tri-O-methyl-D-glu…
Eigenschaften der Neutronenstrahlen, Aufbau eines Neutronenspektrometers. Untersuchung der Struktur des Zementits Fe 3 C, des Wolframkarbids WC und der Chromkarbide Cr 3 C 2 und Cr 23 C 6 . Vergleich der Ergebnisse mit den aus dem Schrifttum bekannten.
The binary system CaO‐Nb 2 O 5 has been shown to include three compounds: CaO·Nb 2 O 5 , which melts congruently at 1560°C; 2CaO·Nb 2 O 5 , which melts congruently at 1576°C; and 3CaO·‐Nb 2 O 5 , which melts incongruently at 1560°C. Three eutectic compositions occur at 6% CaO (1362°C), 23% CaO (1492°C), and 34% CaO (1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPREPARATION, STRUCTURE, AND PROPERTIES OF K2NbO3FFrancis Galasso and Wilda DarbyCite this: J. Phys. Chem. 1962, 66, 7, 1318–1320Publication Date (Print):July 1, 1962Publication History Published online1 May 2002Published inissue 1 July 1962https://pubs.acs.org/doi/10.1021/j1…
Abstract Polytetrafluoroethylene was irradiated in air, in a vacuum, at elevated temperature, in a nitrogen atmosphere, and in some combinations of these conditions. In all cases the plastic was found to degrade in its structural characteristics. Even the most favorable condition of irradiation (irradiation in vacuo )…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTN-Functionally Substituted PyrrolesA. D. Josey and E. L. JennerCite this: J. Org. Chem. 1962, 27, 7, 2466–2470Publication Date (Print):July 1, 1962Publication History Published online1 May 2002Published inissue 1 July 1962https://pubs.acs.org/doi/10.1021/jo01054a042https://d…
Abstract Clay fractions of soils which contain intergrades of chlorite‐expansible 2:1 layer silicates from three states were studied. The citrate, fluoride, and 400° and 500°C. dehyroxylation‐NaOH methods of removing the interlayer materials were compared. The latter method removed more interlayer material than either…
Paramagnetic measurements have been made on powder samples of VB, CrB, MnB, FeB, CoB and NiB either over the temperature range 150°K to 800°K or, in the case of those that are ferromagnetic, from the Curie point to 800°K. The data for the ferromagnetic borides are intended to supplement results obtained below the Curi…
Abstract : Directions are given for the fabrication, cleaning, and sterilizing of a modified CarlsonCrittenden parotid fluid collecting device that has been use-tested by the authors in the collection of over 40,000 specimens. It has served particularly well in prolonged collections made with exogenous stimulants. The…
The growth of pre-breakdown currents in uniform field conditions in sulphur hexafluoride at different pressures for values of E/p in the range of 90 to 160 v cm -1 mmHg -1 (5-200 mmHg pressure) indicates very large electron attachment. It is assumed that the mechanism of negative ion formation is due to dissociative a…
(1962). Neutron scattering studies of liquid diffusion. Advances in Physics: Vol. 11, No. 43, pp. 203-232.
The optical constants of diamond have been determined in the range 5.5 to 23 eV by applying the Kramers-Kronig relation to normal incidence reflectance data. There are two salient features in the curve for optical absorption. First, the absorption rises rapidly near 7 eV, indicating the onset of strong direct transiti…
A combined rheological and dark-ground microscopical study of mouse brain tissue is reported. In its near physiological state, brain tissue is an aggregate of hydrophilic colloidal particles with marked ion- and water-binding capacity. The colloidal
Abstract Im Temperaturbereich von 600–690°C wird von MoO 3 , im Temperaturbereich von 900–1100°C von WO 3 , die in Gegenwart von Wasserdampf erhöhte Flüchtigkeit der Oxide mit Hilfe der Mitführungsmethode studiert. Die gemessenen Gleichgewichte werden formuliert nach Für beide Reaktionen werden thermochemische Daten m…
The phase diagram for the Bi2Te3–Sb2Te3 pseudo-binary system is of the solid-solution type, where the distribution coefficient k is equal to unity at 33.3 and 66.7 mole % Sb2Te3. The c lat tice parameter remains essentially constant across the diagram at 30.49 Å for both slowly crystallized and quenched alloys. For qu…
The Wood anomalies are dark or bright bands in the spectrum produced by a diffraction grating. They occur at observed wavelengths for which light of the same wavelength is diffracted in another order so as to graze the surface of the grating. The equations describing the position of the anomalies are discussed for a v…
The growth of a bubble within a volume of isothermal viscous liquid containing uniformly distributed dissolved gas is considered. The problem of characterizing this growth-by-mass-transfer is reduced to an integro-differential equation for the bubble radius as a function of time, and a computer solution is obtained. T…
The mean-square breadth of a deliberately truncated portion of a diffraction line has been suggested as a measure of particle size by Tournarie. Tournarie's theory is generalized to include other causes of line broadening. For small particle size it is shown that the mean-square breadth in 2θ can be expressed in the f…
Using a high frequency cw mechanical resonance technique, the adiabatic elastic constants of single crystals of molybdenum and tungsten were measured between 77° and 500°K.
The position of the Fermi level at the surface has been determined over the entire available range of bulk dopings for atomically clean (111) silicon surfaces cleaved in a vacuum of ${10}^{\ensuremath{-}10}$ mm Hg. Surface potential is found from the difference in work function and photoelectric threshold. The latter…