Experimental and analytical study of vibrations of joined shells.
Vibrational characteristics of composite shells, noting effects of circular joint connecting two components
Materials Literature
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Magneto-Fluid-Mechanic Channel Flow. I. Experiment
An experiment is described in which fully developed turbulent channel flow of mercury was investigated in the presence of a uniform transverse magnetic field. The channel test section was constructed from an electrical insulator and was rectangular in cross section. The flow was studied in the range of Reynolds number…
Disproportionation of organic polysulfides
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDisproportionation of organic polysulfidesTimothy L. Pickering, K. J. Saunders, and Arthur V. TobolskyCite this: J. Am. Chem. Soc. 1967, 89, 10, 2364–2367Publication Date (Print):May 1, 1967Publication History Published online1 May 2002Published inissue 1 May 1967https://pub…
Anion exchange and a selectivity scale for elements in sulfuric acid media with a strongly basic resin
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAnion exchange and a selectivity scale for elements in sulfuric acid media with a strongly basic resinF. W. E. Strelow and C. J. C. BothmaCite this: Anal. Chem. 1967, 39, 6, 595–599Publication Date (Print):May 1, 1967Publication History Published online1 May 2002Published in…
Heterogeneous nucleating agents for polypropylene crystallization
Abstract A model nucleating agent for polypropylene crystallization is described. A series of compounds consisting mainly of organocarboxylic acid salts is evaluated as heterogeneous nucleating agent for polypropylene crystallization by measuring their effect upon the polymer supercooling. Sodium benzoate and basic al…
Crystallization of Diamond and Graphite
The key features of the complete, stable nickel—carbon phase diagram have been established at pressures up to 54 kbar, and these features have been directly related to the nucleation and growth characteristics of diamonds in this system. At pressures in excess of 52.5 kbar, a liquid+graphite+diamond eutectic is formed…
Preparation and fabrication of aromatic polyimides
Abstract Aromatic polyimides were prepared from pyromellitic dianhydride and a number of aromatic diamines. The effect of certain variables on the polymerization to, and the degradation of, the intermediate polypyromellitamic acids was studied, and a previously unrecorded reaction intermediate was isolated and identif…
The bowing of a dislocation segment
The bowing under stress of a segment of an otherwise straight dislocation line has been determined for an isotropic solid. A digital computer is used to relax the dislocation to its equilibrium shape, using a variant of the Brown self-stress method. The critical stress required to make the dislocation become unstable…
Observation of Tunable Optical Parametric Fluorescence
Optical fluorescence, thermally tunable over significant portion of visible and near IR SPECTRUM, from phase-matched parametric system
Introduction to Nuclear Reactor Theory
"Introduction to Nuclear Reactor Theory." Nuclear Science and Engineering, 28(2), pp. 313–314
Hexagonal Diamond—A New Form of Carbon
A new crystalline form of carbon—hexagonal diamond—has been synthesized in the laboratory under conditions of static pressure exceeding about 130 kbar and temperature greater than about 1000°C. It is necessary to start with well-crystallized graphite in which the c axes of the crystallites are parallel to each other a…
Mössbauer Analysis of Iron in Clay Minerals
Mössbauer absorption spectrography can be used to establish the presence of Fe(2)+ and Fe(3)+ in clay minerals. In the sheet structure silicates, octahedrally coordinated iron can be distinguished from tetrahedrally coordinated iron. Siderite and goethite, common contaminants of the clay minerals, can usually be detec…
Chemical Exfoliation of Vermiculite and the Production of Colloidal Dispersions
Chemical treatments involving ion exchange cause gross onedimensional swelling in water of single crystals of vermiculite minerals. A delicate balance of forces holds the individual silicate layers (10 angstroms thick) parallel to one another although separated by several hundred angstroms. Colloidal dispersions produ…
Relationship between chemical structure and biological activity of hen egg-white lysozyme and lysozymes of different species
Abstract Fleming discovered an enzyme which he called lysozyme; it had ‘the power of rapidly dissolving certain bacteria, which is possessed by many animal and vegetable tissues and secretions and to a very marked degree by egg-white' (Fleming 1922). Hen egg-white lysozyme was crystallized by Abraham & Robinson in…
Crystallographic studies of the activity of hen egg-white lysozyme
Abstract The chemical evidence for the enzymic activity of lysozyme will be discussed in detail by other speakers at this meeting, but in order to describe our crystallographic studies of the interactions between the enzyme and its substrates it is necessary to summarize briefly what was known about them at the beginn…
Infrared Lattice Vibrational Spectra of AgCl, AgBr, and AgI
The infrared transmission spectra of AgCl, AgBr, and AgI have been measured between 400–30 cm−1 at room temperature and at 143°K. Strong absorptions characteristic of the transverse optic modes were found, together with weak subsidiary absorptions arising from multiphonon combinations. The longitudinal optic modes of…
Spontaneous decarboxylation of oxalacetic acid
The kinetic study at different pH values indicates that the monoanion of oxalacetic acid is the major active species which decarboxylates spontaneously. The decarboxylation of the monoanion is favored by nonpolar solvents. Solvent and isotopic effects suggest that the reaction may proceed via an intramolecular hydroge…
First and Second Sound in Crystals
A semiphenomenological theory for pure, insulating Bravais lattices is developed to clarify in a unified fashion the problems of sound propagation, sound damping, second sound, and heat conduction. The crystal is described as a gas of interacting quasiparticles coupled to an anisotropic elastic medium. The thermodynam…
Vacancy Clusters inα-Iron
A mathematical lattice model was used to compute the kinetic and static aspects of vacancy-cluster nucleation, growth, and dissociation in $\ensuremath{\alpha}$-iron. Persistent attention is paid to the kinetics of changes among metastable configurations as well as the formation of stable configurations. The tetravaca…
CRITICAL THICKNESS AND PERPENDICULAR ANISOTROPY OF EVAPORATED PERMALLOY FILMS WITH STRIPE DOMAINS
We report that the critical thickness for the appearance of stripe domains in evaporated permalloy films depends sensitively on vacuum pressure during evaporation and also that the perpendicular anisotropy constant can be obtained from the critical thickness rather precisely. It was found that the perpendicular anisot…