Consideraciones prácticas sobre precipitadores electrostáticos
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Determinación rápida del ion cloruro en yesos, arcillas y cementos
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Carbones pobres. Utilización de combustibles pobres en la fabricación de cemento
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On the Ferromagnetic Phase in Manganese-Aluminum System
A metallographical investigation of manganess-aluminum system was made in the compositional range of 47% to 60% of manganese, with the results of a new hexagonal close-packed phase and a metastable tetragonal ferromagnetic phase derived therefrom. The conditions necessary for formation, structure, stability and therma…
Interaction between particles suspended in solutions of macromolecules
Abstract An attractive force appears between particles suspended in solutions of macromolecules when there is neither direct interaction between two particles nor energetic interaction between particles and solute macromolecules. The magnitude of this force is of the order of the osmotic pressure of the solution of ma…
Über die Synthese verzweigter Carbonsäuren nach der Ameisensäure‐Methode
Abstract Mit Ameisensäure als Kohlenoxydquelle können ohne Druckapparatur zahlreiche verzweigte Carbonsäuren aus Olefinen, Alkoholen, Alkylchloriden oder Estern in guten Ausbeuten hergestellt werden. Die Umsetzung, die in Gegenwart von konz. Schwefelsäure stattfindet, führt bevorzugt zu tertiären Säuren, z. B. Trimeth…
Staining of Tissue Sections for Electron Microscopy with Heavy Metals
Descriptions of three heavy metal stains and methods of application to tissue sections for electron microscopy are presented. Lead hydroxide stains rather selectively two types of particles in liver: those associated with the endoplasmic reticulum and containing ribonucleic acid and other somewhat larger particles. Ba…
Collisions of Electrons with Hydrogen Atoms. III. Elastic Scattering
The cross section for elastic scattering of electrons of less than 10-ev energy by free hydrogen atoms has been measured. The experimental approach was similar to that used by Bederson, Malamud, and Hammer in that a dc electron beam crossed an atomic hydrogen beam, which was chopped at a low frequency, and the signal…
Magnetocrystalline Anisotropy Constants of Iron at Room Temperature and Below
The anisotropy constants of iron have been determined from torque measurements on a {100} single-crystal disk in fields up to 15 000 oersteds or higher and at temperatures of 77, 195, and 300\ifmmode^\circ\else\textdegree\fi{}K. The values of ${K}_{1}$ at the three temperatures are (520\ifmmode\pm\else\textpm\fi{}10)\…
Magnetic Structure and Vacancy Distribution inγ-Fe2O3by Neutron Diffraction
The neutron diffraction pattern of γ-Fe2O3 indicates a cubic defect spinel structure with vacancies located at octahedral lattice sites.Received 28 July 1958DOI:https://doi.org/10.1103/PhysRev.112.1130©1958 American Physical Society
Electron Paramagnetic Resonance of Manganese (II) in Hexagonal Zinc Oxide and Cadmium Sulfide Single Crystals
The electron paramagnetic resonance of ${\mathrm{Mn}}^{++}$ in hexagonal ZnO and CdS single crystals has been observed. The values of the crystal field parameters were obtained from the spectra and the signs of the parameters were determined from the temperature dependence of the intensities of the peaks. In addition…
Antiferromagnetic Properties of the Iron Group Trifluorides
A neutron diffraction study has been made of the trifluorides of $3d$ transition group elements. The arrangement of the magnetic ions and the anions in these trifluorides is similar to that in the compounds $\mathrm{La}M{\mathrm{O}}_{3}$ for which the antiferromagnetic properties have been studied earlier. No antiferr…
The spontaneous magnetization of nickel + copper alloys
Abstract The spontaneous magnetization (σ0, T) of a ferromagnetic may be deduced exclusively from the determination of magnetic isothermals, or in conjunction with magnetocaloric measurements. Values of σ0, T of a nickel + copper alloy containing 30·75 at. % of copper have been obtained near its Curie temperature usin…
A single crystal neutron diffraction study of diaspore, AlO(OH)
A single-crystal neutron-diffraction study of diaspore has been made in which the intensities of ninety reflections of the hkO and Okl zones were measured. Unitcell dimensions and their standard errors as redetermined by the x- ray powder method are a = 4.401 plus or minus 0.001, b = 9.421 plus or minus 0.004, and c =…
The polarization of atomic line radiation excited by electron impact
Abstract The dipole radiation emitted by an atom excited by a unidirectional electron beam has a nonuniform angular distribution which is simply related to the percentage polarization P of the radiation emitted perpendicular to the beam. P was first calculated using the OppenheimerPenney (O.-P.) theory. In this theory…
Attempts to Introduce Amide Cross-Links into Wool
Peptide-forming reagents have been Applied to wool in an attempt to convert "salt links" into amide cross-links. Wool which has been modified with biscyclohexyl carbodi imide is almost unchanged in weight, handle, and appearance but has increased resistance to attack by alkali, alkaline thioglycollate, urea-bisultite,…
Note on Calculation of Effect of Temperature and Composition on Specific Heat of Glass
The specific heats of glasses reported in the literature since 1951 were studied in relation to the Sharp‐Ginther equation. It was found necessary to change the factors previously furnished for K 2 O and B 2 O 3 . The other factors were found to be satisfactory when compared with the new measurements. It was discovere…
The Redox Equilibrium in Wüstite and Solid Solutions of Wüstite and Magnesium Oxide
Abstract Measurements have been carried out on the equilibrium between ferrous and ferric iron in wüstite containing various amounts of magnesium oxide, at various partial oxygen pressures and 1400 °C. These data, together with the data of Darken and Gurry [2] for the pure wüstite, are used for a discussion of the app…