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Effects of Very High Pressures on Glass
In contrast to other inorganic solids, glasses may be permanently compacted by application of pressures of the order of 104 to 105 atmospheres. This effect was studied on two simple oxide glasses (SiO2 and B2O3) and several silicate glasses. The effect of compacting was studied by measuring the densities, dimensions,…
The electrical properties of graphite
Abstract The Hall coefficient and resistivity of a range of polycrystalline graphites with different crystal sizes and a single crystal of Travancore graphite have been measured over a wide range of temperature. The number of free electrons has been found to be approximately 6x1018 per cm3 at room temperature; the var…
The irreversible approach to equilibrium in glasses
Abstract In liquids the molecular configuration is a function of temperature. If in a given substance super-cooling of the liquid is possible to such a low temperature—the ‘transformation temperature’ (Tg)—that the viscosity reaches about 1013 poises, the required changes in configuration become impossible and at all…
NEW FOSSIL REPTILES FROM SZECHUAN CHINA
INTRODUCTION The following described materials have been unearthed partly during the construction of the Ch ngtu-Chungking Railway mainly in 1951 and partly during the clearing away the building foundation in Tatienwan, a suburb of Chungking.
Molière's Theory of Multiple Scattering
Mole\`ere's theory of multiple scattering of electrons and other charged particles is here derived in a mathematically simpler way. The differential scattering law enters the theory only through a single parameter, the screening angle ${{\ensuremath{\chi}}_{a}}^{\ensuremath{'}}$, Eq. (21). The angular distribution, ex…
Stable configurations of polypeptide chains
Abstract Several configurations of polypeptide chains involving planar amide groups with the dimensions found by experiment for simple substances, and hydrogen bonds between the NH groups and the carbonyl oxygen atoms, have been discovered. One of these structures, the α-helix, with about 3·7 amino-acid residues per t…
The Present Status of Bacterial Corrosion Investigations in the United States
Since the first studies with bacterial corrosion of underground pipe lines in 1939 in the United States chief interest has been centered in this subject in the Eastern states. Indications are that the causative sulfate-reducing bacteria and the characteristic anaerobic soils associated with their corrosive action are…
Convergence Insufficiency: Incidence Among Military Personnel and Relief by Orthoptic Methods
Paul R. Kent, MSC, USN, J. Howard Steeve, MSC, USN; Convergence Insufficiency: Incidence Among Military Personnel and Relief by Orthoptic Methods, The Mili
Gyrolite
The mineral gyrolite was discovered in Skye by T. Anderson in 1851. He showeditto be ahydratedcaleiumsilicateofapproximate composition 2CaO.3SiO 2 .3H 2 O. Subsequently gyrolite has been found in other localities, and has been prepared hydrothermally by Flint, McMurdie, and Wells. The ratio of lime to silica found by…
Über Manganoxyde. II. Zur Kenntnis des Mangan(VII)‐oxyds
Abstract Die Darstellung von Mangan(VII)‐oxyd aus Kaliumpermanganat und konz. Schwefelsäure wird beschrieben, Mangan(VII)‐oxyd ist eine in der Aufsicht grüne, in der Durchsicht rote, ölige Flüssigkeit vom Smp. 5,9° und dem Zersetzungspunkt ∼55°. D = 2,396; elektr. Leitfähigkeit x < 4 · 10 −9 Ohm −1 · cm −1 . Dielek…
Effect of the Fermi Energy on the Stability of Superlattices
When an alloy develops an ordered structure, new Brillouin zone boundaries are formed corresponding to the extra Bragg reflections. It is shown that, in this process, the Fermi energy is lowered, and this tends to stabilize the superlattice. The theory is applied to the superlattices in CuPt, CuAu and Ag 3 Mg, where t…
The Thermal Decomposition of Nitromethane
A study of the thermal decomposition of nitromethane was made by the flow method, with nitrogen as carrier gas, the reaction being followed by polarographic analysis of the effluent from the furnace for nitromethane. When carefully dried nitrogen was used the rate of disappearance of nitromethane became erratic; it wa…
The Catalytic Oxidation of Carbon Monoxide on Nickel Oxide. I. Pure Nickel Oxide
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Catalytic Oxidation of Carbon Monoxide on Nickel Oxide. I. Pure Nickel OxideG. ParravanoCite this: J. Am. Chem. Soc. 1953, 75, 6, 1448–1451Publication Date (Print):March 1, 1953Publication History Published online1 May 2002Published inissue 1 March 1953https://pubs.acs.o…
The Determination of Surface Tension by Sessile Drop Measurements, with Application to Mercury
The error in the Worthington (1885) sessile drop equation, as an approximation to the exact equation from which it was derived, is found to be of the order of experimental errors in recent surface tension determinations. The source of error and origin of the optical band system observed when parallel light is used to…
The Bearing-Capacity Failure Of The Transcona Elevator
Synopsis In 1913, a grain elevator near Winnipeg, Canada, experienced a bearing-capacity failure during its first loading. The foundation consisted of a large rectangular raft resting on a plastic clay deposit. The load at failure is known. This article presents the results of tests made to determine the properties of…
Catalytic Activity of Lanthanum and Strontium Manganite
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCatalytic Activity of Lanthanum and Strontium ManganiteG. ParravanoCite this: J. Am. Chem. Soc. 1953, 75, 6, 1497–1498Publication Date (Print):March 1, 1953Publication History Published online1 May 2002Published inissue 1 March 1953https://pubs.acs.org/doi/10.1021/ja01102a52…
Ferrous chamosite and ferric chamosite
In a previous paper (Brindley, 1951) chamosites from a number of localities were examined, and their structure was shown to be of kaolin-type. Furthermore, it was shown that many of the variations in X-ray powder diagrams of chamosites can be accounted for by the existence of two kaolin-type structures, one hexagonal…
Elasticity and Thermal Expansion of Germanium Between −195 and 275°C
Young's moduli (E) of the directions 〈100〉 and 〈111〉 and the shear modulus (G) for 〈100〉 were determined in germanium from −195 to 255, 275, and 140°C, respectively. From these moduli, the elastic parameters, the compressibility, and Poissons's ratio were calculated. The thermal expansion was measured from −196 to 275…