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,…
Coatings of Polyamide and Epoxy Resin Blends
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCoatings of Polyamide and Epoxy Resin BlendsM. M. Renfrew, Harold Wittcoff, Don E. Floyd, and D. W. GlaserCite this: Ind. Eng. Chem. 1954, 46, 10, 2226–2232Publication Date (Print):October 1, 1954Publication History Published online1 May 2002Published inissue 1 October 1954h…
Inductive Effect and Hydrogen Bonding as Factors in the Base Strength of Polymethylenediamines
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInductive Effect and Hydrogen Bonding as Factors in the Base Strength of PolymethylenediaminesAlexander GeroCite this: J. Am. Chem. Soc. 1954, 76, 20, 5159–5160Publication Date (Print):October 1, 1954Publication History Published online1 May 2002Published inissue 1 October 1…
Reactivity of Deposited Carbon
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReactivity of Deposited CarbonE. R. Gilliland and Peter HarriottCite this: Ind. Eng. Chem. 1954, 46, 10, 2195–2202Publication Date (Print):October 1, 1954Publication History Published online1 May 2002Published inissue 1 October 1954https://doi.org/10.1021/ie50538a052Request…
The Inorganic Phosphates as Polyelectrolytes.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Inorganic Phosphates as Polyelectrolytes.Clayton F. Callis, John R. Van Wazer, and Peter G. ArvanCite this: Chem. Rev. 1954, 54, 5, 777–796Publication Date (Print):October 1, 1954Publication History Published online1 May 2002Published inissue 1 October 1954https://pubs.a…
Theory of Strong Electromagnetic Waves in Massive Iron
A rigorous solution of Maxwell's equations is carried through for the case of a rectangular magnetization curve. Formulas for the depth of penetration and the wave impedance are derived yielding a theoretical power input formula which relates to the popular quasi-theoretical formula of Rosenberg by just the factor 4/π.
The Dynamic Bulk Viscosity of Polyisobutylene
The dynamic bulk modulus of a high molecular weight polyisobutylene is calculated from measured longitudinal-wave and shear moduli. A viscous or energy-dissipating process associated with pure volume deformation is found, which appears to be a relaxation process. The peak in absorption of the shear and bulk moduli and…
Temperature dependence of compression of linear high polymers at high pressures
PressUl'e-voiume-temperature da ta for polyethylene, polytetrafluoroethylcne, polym onochloro t riflu oroethy lcne, polyvinyl fluoride, polyvinylidene fluoride, polyvinyl alcohol, a copolymer of ethy lene-tetrafluoroethy lene (1: 1), and a polyester are reported over the range 20 to 80 C and 1 to 10,000 atmospheres. E…