Frequency Dependence of Ultrasonic Cavitation
On the basis of a simplified model an explanation for the high-frequency limit of ultrasonic cavitation is suggested and compared with published experimental data.
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The near infra-red absorption spectra of natural and synthetic fibres
The near infra-red region may be used to obtain spectra with polarized radiation of natural and synthetic fibres. This region has considerable experimental advantages and the spectra of poly-L-alanine, polyglycine, wool, silks and commercial regenerated protein fibres are shown and discussed. Besides supplementing oth…
An Electron Interferometer
An interferometer of the amplitude-splitting type has been constructed which operates with electron beams and produces a system of fringes in the viewing instrument. The appearance of the fringes may be varied at will by introducing changes in one of the (electron) optical paths. The instrument utilizes crystalline di…
Coefficients of Thermal Expansion of Solids at Low Temperatures. I. The Thermal Expansion of Copper from 15 to 300°K.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCoefficients of Thermal Expansion of Solids at Low Temperatures. I. The Thermal Expansion of Copper from 15 to 300°K.Thor Rubin, Howard W. Altman, and Herrick L. JohnstonCite this: J. Am. Chem. Soc. 1954, 76, 21, 5289–5293Publication Date (Print):November 1, 1954Publication…
On the Thermal Decomposition of Ammonium Nitrate. Steady-state Reaction Temperatures and Reaction Rate
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOn the Thermal Decomposition of Ammonium Nitrate. Steady-state Reaction Temperatures and Reaction RateGeorge Feick and R. M. HainerCite this: J. Am. Chem. Soc. 1954, 76, 22, 5860–5863Publication Date (Print):November 1, 1954Publication History Published online1 May 2002Publi…
Kiln setting and burning
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Die bedeutung dar calciumaulfatformen bei der abbindezeitregelung des zementes
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Peut-on prévoir l'importance du retrait d'un ciment par un essai rapide?
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Plasterboard and aluminium insulation
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Contribución al estudio de la estructura del Clinker de cemento portland
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Voraussetzungen für die herstellung hochwertigen betons
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Gas Bubbles with Organic Skin as Cavitation Nuclei
The hypothesis discussed that the cavitation nuclei consist in gas bubbles. Due to surface tension, small bubbles would dissolve in a very short time. If the bubbles are larger than 5×10−3 cm, or if the liquid is supersaturated, they may last longer or even be stable, but then no cavitation threshold exists. The hypot…
Studies of the Cross-linking Process in Gelatin Gels. III. Dependence of Melting Point on Concentration and Molecular Weight
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudies of the Cross-linking Process in Gelatin Gels. III. Dependence of Melting Point on Concentration and Molecular WeightJohn E. Eldridge and John D. FerryCite this: J. Phys. Chem. 1954, 58, 11, 992–995Publication Date (Print):November 1, 1954Publication History Published…
The use of semiconductors in thermoelectric refrigeration
In the past the possibility of thermoelectric refrigeration has been considered, but all attempts to produce a practical refrigerator have failed owing to lack of suitable thermocouple materials. In this paper it is proposed that semiconductors should be used and the factors governing their selection are discussed. It…
Dielectric Properties and Phase Transitions of NaNbO3and (Na,K)NbO3
An optical, dielectric, and structural study has been carried out on NaNb${\mathrm{O}}_{3}$ and the solid solution (Na,K)Nb${\mathrm{O}}_{3}$, both single crystals and ceramics being used. No evidence for ferroelectricity in NaNb${\mathrm{O}}_{3}$ was found, and the crystal seems to be antiferroelectric in accordance…
Complex hyperfine structures in microwave spectra of covalent iridium compounds
Abstract Magnetic resonance spectra are described for two compounds containing covalently bound [IrCl6]2- complexes and one containing [IrBr6]2-, and the results are analyzed using the π-bonding theory developed by Stevens. The spectra show hyperfine structure lines arising from interaction of the magnetic electrons b…
Magnetostriction and Crystal Anisotropy of Single Crystals of Hexagonal Cobalt
Magnetostriction at saturation has been measured in various crystallographic directions in a single crystal of cobalt. Results are described by Mason's formula [see Eq. (1)] with 4 constants, which are now evaluated. Magnetization causes contractions as large as 100\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{…
Derivation of Magnetostriction and Anisotropic Energies for Hexagonal, Tetragonal, and Orthorhombic Crystals
In order to determine the measurements necessary to characterize the anisotropic energy and the saturation magnetostriction in hexagonal cobalt, a phenomenological derivation has been given for the equations which characterize the effects. Out to fourth rank tensors, the results are the same as those for circular symm…
Auger Ejection of Electrons from Tungsten by Noble Gas Ions
Experimental investigation of electron ejection from atomically clean tungsten by singly and multiply charged ions of the noble gases is reported. Total electron yield, ${\ensuremath{\gamma}}_{i}$, and distribution in kinetic energy of the secondary electrons have been measured. Ion energies range from 10 to 1000 ev f…
Theory of Auger Ejection of Electrons from Metals by Ions
Electrons ejected from atomically clean metals by slow ions of the noble gases arise in Auger transitions which involve either the direct neutralization of the ion or the de-excitation of an excited atom. A theory of these processes is presented in which the form of the distribution in energy and relative total yield,…