Materials Literature
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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…
The thermodynamic properties of amorphous phases of linear molecular chains are obtained from statistical mechanics by means of a form of the quasi-lattice theory which allows for chain stiffness and the variation of volume with temperature. A second-order transition is predicted for these systems. This second-order t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation of Graphitic OxideWilliam S. Hummers Jr. and Richard E. OffemanCite this: J. Am. Chem. Soc. 1958, 80, 6, 1339Publication Date (Print):March 1, 1958Publication History Published online1 May 2002Published inissue 1 March 1958https://pubs.acs.org/doi/10.1021/ja01539…
Precise measurements of lattice expansion of high-purity copper held near 10\ifmmode^\circ\else\textdegree\fi{}K during deuteron bombardment were made using a rotating single-crystal method. An expansion of (4.1\ifmmode\pm\else\textpm\fi{}0.2) \ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}21}$ per 7-Mev deute…
Possible elementary excitations in solids are studied with the aid of the general theoretical approach developed in the preceding papers of this series. Particular attention is paid to the basic theoretical justification for the individual-particle-like elementary excitations ("effective" electrons). It is concluded t…
Small-signal dielectric constant measurements were made on single domain crystals of BaTi${\mathrm{O}}_{3}$ from 25\ifmmode^\circ\else\textdegree\fi{}C to 170\ifmmode^\circ\else\textdegree\fi{}C at 24 kMc/sec. A typical Curie behavior was observed with a dielectric constant ${\ensuremath{\epsilon}}_{11}$ of about half…
Abstract Part of the research on the structure, synthesis, and properties of clay minerals in Yugoslavia is reviewed with particular reference to the following problems: (a) attempts to synthesize halloysite from solutions under normal conditions; (b) structure and properties of synthetic montmorillonites; (c) dehydro…
Abstract Protocatechuic acid which is available from tree sources was converted to a hydroxymethyl‐1,4‐benzodioxan carboxylic acid by reaction with epichlorohydrin. This hydroxy acid was condensed by heating under vacuum to from a linear polyester which was converted to fibers by melt spinning. By applying stretch dur…
The general features of nitrite inhibition and the mechanism of its action, so far as known, are discussed. Particular cases of nitrite inhibition in hydraulic fluids, cutting fluids, storage fluids, fire-extinguishing plant, canned goods, automobile cooling systems and marine turbine systems are then reviewed. The ad…
Zirconium and titanium inhibit solution mass transfer of steels by liquid bismnuth, mercury, and lead. It is shown that in bismuth and mercury, these adsorb on the surface of the steels and subsequently react with nitrogen and possibly carbon from the steels to form inert, adherent surface layers of ZrN, TiN, or TiN +…
The adsorption isotherms of water vapour on a wide range of commercial secondary cellulose acetate and cellulose triacetate fibres have been measured at 22°C. Conversion of cellulose acetate flake into fibres causes a drop in sorption, but otherwise the sorption is almost unaffected by the filament denier, conversion…