Materials Literature
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Part I of this paper presented an analysis of an idealized polyphase hysteresis machine having a radial-flux type of rotor. In this Part II, a hysteresis machine with a circumferential-flux type of rotor is analyzed. Using a rectangular loop approximation to the B-H characteristic of the hysteresis material, the flux…
The resonant frequency in transverse vibration of natural single crystals of purified Ticonderoga graphite has been measured as a function of neutron dose. The resonant frequency increases on irradiation by a factor of two and saturates at a dose of ∼4 × 1017 n.v.t. Annealing reduces the resonant frequency again. The…
Abstract Bisphenol‐A polycarbonate gradually degrades at temperatures above 310°C. as detected by differential thermal analysis. The first stage of degradation of the dry and purified resin is induced by oxygen. In connection with oxidation, zinc stearate causes a notable degradation. This compound may act partly as a…
The Preliminary Check-list (Parke, 1953), with the three subsequent lists of additions and corrections (Parke, 1956, 1957, 1959) was intended to provide a fundamental basis for the preparation of a Flora of the British marine algae sponsored by the British Phycological Society. Changes, both taxonomic and systematic,…
The magnetic ripple of thin films with uniaxial anisotropy is calculated for the field and the magnetization lying along the easy and the hard direction of the uniaxial anisotropy. For small dispersion of the direction of magnetization, the variational principle, applied to all energy terms including the exchange, cry…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Sonolytic Decomposition of Organic Solutes in Dilute Aqueous Solutions. I. Hydrogen Abstraction from Sodium FormateM. Anbar and I. PechtCite this: J. Phys. Chem. 1964, 68, 6, 1460–1462Publication Date (Print):June 1, 1964Publication History Published online1 May 2002Publ…
The infrared and Raman spectra of a single crystal of sodium azide have been intensively investigated at 298° and 90°K using grating spectrometers. Selection rules for internal and lattice vibrations are determined by application of the unit cell (factor group) method of Bhagavantam and Venkatarayudu. The unit cell mo…
The temperature dependence of the dielectric constant of NaNO 2 was investigated in detail in the neighbourhood of the Curie point. A new peak was found in the E 22 – T curve at about 1°C above the Curie point (162.1°C). The peak at the Curie point was shifted to higher temperature by application of a D.C. bias field.…
The crystal structure of zinc metaborate has been determined by single crystal x-ray methods. The crystals have cubic symmetry with a = 7.48±0.01 Å, space group I [unk]3 m , and two molecules in the unit cell. A complete set of atomic parameters has been determined by Patterson and electron-density projections and the…
Abstract The prevailing view is that tufa deposition at Mono Lake, Calif., is predominantly inorganic; it is here shown that algae probably initiate much of the CaCO 3 precipitation from the highly alkaline waters of the lake. Two exposed pinnacles were studied in detail; one is dry and the other has a summit spring.…
The release of monosilicic acid into solution from soils has been studied under near-neutral and acid conditions. For all soils examined the final concentration of silica decreased with decreasing soil : solution ratio but larger total amounts were released into the larger volumes of extractant. The amount of silica e…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIdentification of Eckstrom-Adcock Iron Carbide as Fe7C3F. H. Herbstein and J. A. SnymanCite this: Inorg. Chem. 1964, 3, 6, 894–896Publication Date (Print):June 1, 1964Publication History Published online1 May 2002Published inissue 1 June 1964https://pubs.acs.org/doi/10.1021/…
Abstract The solution polycondensation of 3,3′ ‐diaminobenzidine tetrahydrochloride with aromatic dicarboxylic acid derivatives in polyphosphoric acid was found to give high molecular weight polyphenylenebenzimidazoles easily. Their preparation and physical properties, such as thermal stability, solubility, crystallin…
Physical properties are presented for extruded and sintered BeO from 25° to 1400° C as a function of porosity (0 to 15%), grain size (5 to 100μ), and grain orientation (random to 80% preferred). The elastic constants and linear thermal expansion are sensitive to the degree of preferred grain orientation. Measurements…
very high angles, and only become significant if the film is photometered to this order of accuracy. These quantities may be compared with the centroid displacement and variance which have been determined previously (Pike, 1957(Pike, , 1959;; Langford, 1962) for a diffractometer with various collimator geometries.
Clinoptilolite has been investigated as a source of porous, largely crystalline, molecular sieve sorbents. By treating the zeolite with mineral acid of different strengths a range of high area sorbents has been produced, in which all the original cations have been replaced by hydronium ions, and in which the aluminum…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal and Molecular Structures of Some Metal TetraphenylporphinesEverly B. Fleischer, Cleta K. Miller, and Lawrence E. WebbCite this: J. Am. Chem. Soc. 1964, 86, 12, 2342–2347Publication Date (Print):June 1, 1964Publication History Published online1 May 2002Published iniss…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA Differential Scanning Calorimeter for Quantitative Differential Thermal Analysis.E. S. Watson, M. J. O'Neill, Joshua. Justin, and Nathaniel. BrennerCite this: Anal. Chem. 1964, 36, 7, 1233–1238Publication Date (Print):June 1, 1964Publication History Published online1 May 2…
The migration energies and atomic configurations for mono- and di-interstitials and mono- and divacancies in $\ensuremath{\alpha}$ iron have been calculated using a classical model. About 530 atoms surrounding the defect were treated as individual particles, each with three degrees of freedom, while the remainder of t…
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