Materials Literature
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The distribution of magnesium and iron over the M1 and M2 positions in Bamle enstatite shocked at 1 megabar is highly disordered. It corresponds to an equilibrium distribution of at least 1000 degrees C. The distribution in samples shocked at 450 kilobars or less is undisturbed.
The International Association for the Properties of Water and Steam has recently adopted a new formulation for the thermodynamic properties of heavy water. This manuscript describes the development of a new formulation for the viscosity of heavy water that is consistent with the new equation of state and is valid for…
Abstract This paper refers to a method for cal‐culating and determining the distribution along a crevice of given geometrical characteristics of voltage and c. d. ex‐changed between the electrolytic solution and the shielded surface of a metallic material susceptible of active‐passive transition. This method has been…
An explicit classification of lattices and crystallographic groups of 4-dimensional space R4 is given. There are (in R4): 710 arithmetic crystal classes; 227 geometric crystal classes belonging to 118 isomorphism types of groups; 64 Bravais classes corresponding to 64 Bravais types of lattices; 33 crystal systems; 23…
Measurements of orientational and forced magnetoresistances have been done on Gd single crystals in a range from 77 K to 400 K. According to a phenomenological analysis, the four anisotropy constants of the orientational magnetoresistance were determined. The temperature dependence of the orientational magnetoresistan…
An electrolytic sectioning technique has been used to measure self-diffusion coefficients for gold in the temperature range 360 to 740 °C. At 740 °C our value agrees with previous work at this temperature, while the lower temperature values are larger than predicted by extrapolation of the well-established high-temper…
Abstract Two types of fluorosilicone polymers are described, the poly(fluoroalkyl)-siloxanes and the hybrid fluorocarbon silicones. The first type, represented by the structure (CF 3 CH 2 CH 2 SiMeO) n exhibits good solvent resistance, thermal and oxidative stability and is commercially available in the form or rubber…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation of new complex metal hydrides. Potassium tetrahydrozincate and sodium tetrahydrozincateE. C. Ashby and R. G. BeachCite this: Inorg. Chem. 1971, 10, 11, 2486–2488Publication Date (Print):November 1, 1971Publication History Published online1 May 2002Published iniss…
The synthesis and nuclear‐magnetic‐resonance spectra of N ‐fluoroacetyl‐ d ‐glucosamine are described, together with 19 F chemical shifts for some monosaccharides substituted with fluorine at different positions. The sugar derivative N ‐fluoroacetyl‐ d ‐glucosamine is inhibitory towards lysozyme, 50% of full inhibitio…
Abstract The diffusion coefficient D and solubility coefficient k of small molecules [C 3 H 6 , C 4 H 10 , (CH 3 ) 4 C] are determined at very low solute concentrations in annealed linear polyethylene over a wide range of temperature above and below the melting point T m . For measurements above T m the specimen was l…
Abstract It is shown that NMR-linewidth measurements are useful to obtain information about the crosslink density and the average distance between the crosslinks in vulcanized rubber. Inhomogeneous structure of the rubber phase in carbon black-filled rubber is evidence and the thickness of the rubber layer on carbon b…
Abstract For some time, polyimides have enjoyed a significant degree of superiority over the other classes of thermo‐oxidatively stable polymers. This superiority is, however, offset by the tremendous difficulty associated with the processing of polyimides. In an effort to understand these difficulties and their cause…
Dielectric polarization, whose activation energy is nearly equal to that of the electrical conduction, has been found in many alkali-silicate glasses and is presumed to be due to the migration of alkali metal ions1,2or some special type of interfacial polarization.3However, the mechanism of polarization has not yet be…
The effects of a number of related diols, substituted diols and glycerol on the thermal stability of acid-soluble calf skin collagen were investigated. Thermal transition temperatures were determined by optical rotation measurement. Short-chain diols with terminal hydroxyl groups, i.e. ethylene glycol and propane-1,3-…
The purpose of this paper is to re port on the development of a system of treatment of wastewater designed to produce different quality effluents suit able for disposal into receiving bodies of water or for reuse. The system has three component parts that can be used either separately or sequentially. The wastewater i…
Two problems in the theory of nematic liquid crystals are formulated. One is concerned with the change of orientation due to magnetic field and the other with shear flow. The solutions of the governing differential equations explain the physical phenomena which have been observed experimentally, namely the alignment o…
When the α-UO3, La2O3 and NaCl structure types are idealized by a topological distortion involving only an extension or contraction of the hexagonal c axis (cubic [111]) it is clear that they are related to each other, and to the CaF2 type, by crystallographic shear. A number of lanthanide and actinide oxide structure…
Lactic dehydrogenase from pig heart isoenzyme (H 4 ) and skeletal muscle (isoenzyme M 4 ), under solvent conditions comparable to conditions in vivo, represents a stable, monodisperse tetramer. Solvent conditions which favour subunit dissociation on principle affect the native conformation of the enzyme leading to (pa…
Abstract Photochemical and thermal geometrical isomerizations of monoazo compounds have been studied in polystyrene– n ‐butylbenzene compositions. Cis–trans isomer ratios established by light absorption were found to depend on matrix viscosity. Where the compositions were above their respective glass temperatures, all…
Abstract p ‐Aminobenzoic acid and formaldehyde were condensed in the presence of acid catalyst. The linear condensation polymer thus obtained was then separated into four fractions by a fractional precipitation method. Conductometric titrations were carried out on these four polymer fractions and the conglomerate in n…