Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymeric Phthalocyanines1C. S. Marvel and John H. RassweilerCite this: J. Am. Chem. Soc. 1958, 80, 5, 1197–1199Publication Date (Print):March 1, 1958Publication History Published online1 May 2002Published inissue 1 March 1958https://doi.org/10.1021/ja01538a045RIGHTS & PERMI…
The magnetic moments of holmium and thulium metals have been measured in applied fields of 3000-18 000 oersteds, over the temperature range of 4.2-300\ifmmode^\circ\else\textdegree\fi{}K. Holmium, paramagnetic above 133\ifmmode^\circ\else\textdegree\fi{}K, appears to be antiferromagnetic between 20\ifmmode^\circ\else\…
Summary A technique is described for the identification of clay minerals, the layers of which are difficult to expand or collapse by the usual treatment with glycerol and KCl. Samples are extracted for 3 to 6 hours in normal sodium citrate at pH 7–3 and 100° C. The citrate is renewed hourly. After the citrate extracti…
Abstract Electron micrographs of highly crystalline PTFE crystallized by slow cooling from temperatures not far above the melting point show well‐marked bands, often with striations perpendicular to the bands; optical evidence shows that the chain molecules are parallel to the striations. The structure is in marked co…
Thin magnetic films (∼1000 A) evaporated onto a heated glass substrate in the presence of a dc magnetic field develop a uniaxial magnetic anisotropy energy of the form Ek=Ksin2φ, with φ measured from the deposition field. Such films promise to outperform ferrite cores in digital-computer memory-systems by several orde…
The antiferromagnetic structures of MnS2, MnSe2, and MnTe2 have been obtained by neutron diffraction. The disulfide exhibits ordering of the ``third'' kind, the ditelluride, ordering of the ``first'' kind, and the diselenide, an arrangement which is intermediate between the two. The structures are discussed from the v…
With a view toward explaining measurements of ultrasonic attenuation in metals, the coefficient of shear viscosity of a free electron gas interacting with thermal phonons and local crystal inhomogeneities is computed. The methods employed are essentially those developed for the problem of electrical conductivity. By m…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetic Studies of the Reaction of Phenyl Isocyanate with Alcohols in Various Solvents1S. Ephraim, A. E. Woodward, and R. B. MesrobianCite this: J. Am. Chem. Soc. 1958, 80, 6, 1326–1328Publication Date (Print):March 1, 1958Publication History Published online1 May 2002Publis…
Untersuchungen über den Aufbau der Eisenecke des Systems Eisen–Chrom–Kohlenstoff bei Gehalten bis zu 4% C und 38% Cr. Ermittlung der Lage der Schmelzflächen, der Vierphasenebenen im Erstarrungsbereich und im festen Zustand sowie der Umwandlungspunkte mit Hilfe metallographischer, röntgenographischer und dilatometrisch…
A statistical model for life-lengths of structures under dynamic loading is derived. The model makes it possible to express the probability distribution of life-lengths in terms of the load given as a function of time and of deterioration occurring in time independently of loading. The special case of a constant load…
A new birefringent filter composed of a series of retardation plates between a single pair of polarizers has been described by Solc. The filter is analyzed and compared with the Lyot filter. It is found that the Solc filter is inferior to the Lyot filter in the suppression of parasitic light in secondary maxima near t…
The spectrum of modes of oscillation of a ferromagnetic spheroid situated in a uniform dc magnetic field is discussed. It is shown that, for the size of sample usually used in microwave experiments, a part of the spectrum consists of magnetostatic modes for which exchange and propagation may be ignored. The behavior o…
Domain-wall structure in Permalloy films in the thickness range 25 to 2000 A has been studied by the Bitter technique. A new type of 180° wall has been observed: the main wall is cut at regular intervals by short, right-angle ``cross ties'' which terminate in free, single ends. The cross-tie period and length are depe…
BUNJI HAGIHARA, HIROSHI MATSUBARA, MASASHI NAKAI, KAZUO OKUNUKI; CRYSTALLINE BACTERIAL PROTEINASE: I. PREPARATION OF CRYSTALLINE PROTEINASE OF BAC. SUBTILI
The thirty lowest eigenvalues of the Mathieu equation have been calculated numerically to nine places for a hindered rotor with threefold symmetry attached to a rigid framework. The results are tabulated for eight values of IV0/2ℏ2 ranging from 56.25 to 115.3125. The splittings of the torsional states of the CH3 group…
The band structure of rhombohedral graphite has been investigated using the nearest-neighbor tight-binding approximation. The resulting behavior of the π-bands near the Fermi surface is more complex than in the case of the Bernal stacking. The two π-bands still touch, but the touching points no longer lie on the edges…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudies on the Chemistry of Halogen and of Polyhalides. XIII. Voltammetry of Iodine Species in AcetonitrileAlexander I. Popov and David H. GeskeCite this: J. Am. Chem. Soc. 1958, 80, 6, 1340–1352Publication Date (Print):March 1, 1958Publication History Published online1 May…
Abstract Conditions for the incomplete displacement of gas from the valley between two parallel ridges by a liquid‐drop front advancing over the ridges are calculated. The significant parameters are found to be the liquid density, surface tension, contact angle, and geometry of the ridges. The solution may be obtained…
Abstract The Gordon‐Taylor equation relating the glass transition temperature θ of a copolymer to the glass transition temperatures θ 1 and θ 2 of the homopolymers is equivalent to where c 1 and c 2 are the weight fractions of the constituents and A 1 and A 2 are constants. It can be recast into the following forms su…
The energy loss resulting from eddy currents is calculated for magnetic sheet materials with a simple domain configuration. The domain model used is considered to be applicable for any induction up to saturation and for the frequency range up to that used in most electrical power applications. The eddy current losses…