Sand moisture determined by direct gage reading
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Standard X-Ray Diffraction Powder Patterns.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStandard X-Ray Diffraction Powder Patterns.Ludo K. FrevelCite this: J. Am. Chem. Soc. 1954, 76, 7, 2031Publication Date (Print):April 1, 1954Publication History Published online1 May 2002Published inissue 1 April 1954https://pubs.acs.org/doi/10.1021/ja01636a108https://doi.or…
Growth of a Vapor Bubble in a Superheated Liquid
The integro-differential equation for the growth of a vapor bubble in a superheated liquid is formulated and discussed. It is shown that two distinct time domains exist: one, of the order of 10−4 second, during which the effect of the hydrodynamic forces may be an important factor in the growth of the bubble, and anot…
The Growth of Vapor Bubbles in Superheated Liquids
The growth of a vapor bubble in a superheated liquid is controlled by three factors: the inertia of the liquid, the surface tension, and the vapor pressure. As the bubble grows, evaporation takes place at the bubble boundary, and the temperature and vapor pressure in the bubble are thereby decreased. The heat inflow r…
Dislocations and Plastic Flow in Crystals
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation A. H. Cottrell, D. L. Dexter; Dislocations and Plastic Flow in Crystals. Am. J. Phys. 1 April 195…
Fractional Separation of Rare Earths by Oxalate Precipitation from Homogeneous Solution
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFractional Separation of Rare Earths by Oxalate Precipitation from Homogeneous SolutionBoyd. WeaverCite this: Anal. Chem. 1954, 26, 3, 479–480Publication Date (Print):March 22, 1954Publication History Published online1 May 2002Published inissue 22 March 1954https://pubs.acs.…
Drift Mobilities in Semiconductors. II. Silicon
The drift mobility of holes in $n$-type silicon and electrons in $p$-type silicon has been measured as functions of impurity concentration and temperature. In single crystals of resistivity greater than 10 ohm-centimeter, the mobility at 300\ifmmode^\circ\else\textdegree\fi{}K of holes is ${\ensuremath{\mu}}_{P}=500\i…
Energy Spectrum Resulting from Electron Slowing Down
The equation for the slowing down of electrons is cast in a form suitable for numerical calculations. Pilot calculations have been performed for source energies of $4m{c}^{2}$ and $80m{c}^{2}$ in Al and Pb. The spectrum of slowed-down electrons, which would be the reciprocal of the stopping power under the assumption…
Electrical Properties of NiO
The conductivity, Seebeck effect, and optical transmission of NiO have been analyzed using two alternative models. The first model assumes conduction to occur in the $d$ levels of Ni ions and yields a quantitative fit to the data. Mobility behavior determined with this model is explained in terms of wavy bands. The se…
Notes on the dunite and the geochemistry of vermiculite at the Day Book dunite deposit, Yancey County, North Carolina
The Day Book dunite deposit of western North Carolina is a well-exposed ultramafic body representative of dunite deposits in the southern Blue Ridge Province. It was intruded after regional metamorphism had begun, but prior to pegmatite invasion. At the contact of the ultramafic body with the country rock, there is a…
Methods of Processing Silver-Magnesium Secondary Emitters for Electron Tubes
In order to prepare a good secondary electron emitting surface from a silver-magnesium alloy, it was found that baking in dry oxygen would not form the desired surface as originally believed, whereas baking in the presence of water vapor did yield a good secondary emitter. Subsequent experiments showed that, because o…
Intensity of X-ray Diffraction by a One-dimensionally Disordered Crystal (III) The Close-packed Structure.
The general intensity equation for X-rays diffracted by a one-dimensionally disordered crystal with any value of the correlation range s i.e. \(I{=}N\text{Spur}\ \textbf{\itshape V}\textbf{\itshape F}+\sum\limits_{n{=}1}^{N-1}(N-n)\text{Spur}\ \textbf{\itshape V}\textbf{\itshape F}\textbf{\itshape Q}^{n}+\text{conj.}\…
High Temperature Heat Contents of Calcium and Magnesium Ferrites
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh Temperature Heat Contents of Calcium and Magnesium FerritesK. R. BonnicksonCite this: J. Am. Chem. Soc. 1954, 76, 6, 1480–1482Publication Date (Print):March 1, 1954Publication History Published online1 May 2002Published inissue 1 March 1954https://pubs.acs.org/doi/10.10…
Infrared Absorption, Photoconductivity, and Impurity States in Germanium
Infrared absorption and photoconductivity in $p$-type germanium with gold and copper impurities have been investigated at different temperatures. Photoconductivity in gold-doped germanium at liquid nitrogen and liquid helium temperatures shows a long wavelength tail beyond the fundamental absorption edge, which falls…
Infrared Dichroism in the 13.8μ Band of n-C36H74 Single Crystals and Polyethylene.
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XXXIV. The correction of elasticity measurements on slightly anisotropic materials
Summary Expressions are derived for the average elastic constants of a poly-crystalline bar, having circular symmetry about its principal axis, and composed of material with cubic crystal symmetry. It is shown that the differences between these and the corresponding constants obtained for a material with completely ra…
Theory of Antiferromagnetic Resonance in CuCl2-2H2O
After giving a short review of Nagamiya-Yosida’s theory of antiferromagnetic resonance, it is shown that this theory is equivalent to Gorter-Ubbink’s at absolute zero, so far as the external field H employed in the former is replaced by H′ defined by 2Hx′=gaHx, etc. and the parallel and perpendicular susceptibilities…
Elastic properties of polvinyl chloride gels
Abstract Young's moduli are measured by a simple compression method on plasticized polyvinyl chloride (Vinylite VYNW) compounds containing from 5 to 100% polymer covering a range of approximately seven orders of magnitude in modulus. By comparing values obtained at different temperatures, it is shown that the 60‐secon…
The Mechanism of Secondary Electron Emission
It is shown that a simple theory based on the constant energy loss per unit path length of primary electrons accounts quantitatively for the variation of secondary electron emission yield below its maximum value. The theory can be extended formally to include a Bethe-type energy loss at high primary energies. An attem…
The Heats of Hydration of Tricalcium Silicate and β-Dicalcium Silicate
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Heats of Hydration of Tricalcium Silicate and β-Dicalcium SilicateStephen Brunauer, J. O. Hayes, and W. E. HassCite this: J. Phys. Chem. 1954, 58, 3, 279–285Publication Date (Print):March 1, 1954Publication History Published online1 May 2002Published inissue 1 March 1954…