The problem of cavitation produced by ultrasonic vibration is examined theoretically. Equations are developed which describe the motion of a gas-filled cavitation bubble in a liquid medium subjected to alternating pressure; the case of an empty cavity is also considered Information is obtained concerning the distribut…

Ultrasound and Cavitation PhenomenaUltrasonics and Acoustic Wave Propagation

Generalizations of the Weiss Molecular Field Theory of Antiferromagnetism

Philip W. Anderson1950-08-15Physical Review

A Weiss field calculation has been carried out for antiferromagnetism in more complicated structures than the usual calculation allows, and has been shown to give results more detailed and more consistent with experimental evidence on the magnetic properties of such structures than does the simpler theory.

Magnetic Properties and Synthesis of FerritesMagnetism in coordination complexesAdvanced Condensed Matter Physics

Nuclear Electric Quadrupole Interactions in Crystals

R. V. Pound1950-08-15Physical Review

A study is made of the effects of the presence of nuclear electric quadrupole moments on the nuclear magnetic resonance absorption in solids. Necessary theoretical background is followed by descriptions of experiments in which the spectra obtained with an r-f spectrograph, described elsewhere, are found to show marked…

Crystallography and Radiation PhenomenaAdvanced NMR Techniques and ApplicationsSolid-state spectroscopy and crystallography

The conductivity of thin wires in a magnetic field

Robert G. Chambers1950-08-07Proceedings of the Royal Society of London A Mathematical and Physical Sciences

Abstract A thin film or wire of metal has a lower electrical conductivity than the bulk material if the thickness is comparable with or smaller than the electronic mean free path. Previous workers have obtained expressions for the magnitude of the effect by integrating the Boltzmann equation and imposing the appropria…

Copper Interconnects and ReliabilitySurface and Thin Film PhenomenaSemiconductor materials and devices

The insoluble matter of coal tar. VI. Oxidation of free carbon

Susanna Green、Biswajit Thakur1950-08-01Journal of the Society of Chemical Industry

Abstract Work on the oxidation of carbonaceous materials with alkaline potassium permanganate is briefly outlined and the experimental step‐wise oxidation of free carbon is described. The course of reaction as interpreted from these results is indicated. Bulk oxidation of free carbon and the nature of the products are…

Lignin and Wood ChemistrySynthesis and properties of polymersThermal and Kinetic Analysis

Analysis of Intensities Obtainable Using Pinhole and Slit Collimators in X-Ray Powder Diffraction Techniques

Leroy Alexander1950-08-01Journal of Applied Physics

Other factors being equal, the integrated intensity of a powder diffraction reflection is a function of the geometry of the source, collimator, and sample. By means of a geometrical and algebraic analysis one can predict the relative intensities to be expected with pinhole or slit collimators of different dimensions.…

X-ray Diffraction in CrystallographyRadiation Shielding Materials AnalysisCrystallography and Radiation Phenomena

Über Molybdänoxyde

Oskar Glemser、Gertrud Lutz1950-08-01Zeitschrift für anorganische und allgemeine Chemie

Abstract Aus Molybdänmetall und MoO 3 werden im Bereich der Zusammensetzung MoO 0,10 bis MoO 2,97 Oxydgemische hergestellt und durch Erhitzen auf verschiedene Temperaturen zur Reaktion gebracht. Beim Erhitzen auf 580° werden folgende Phasen ermittelt: α‐Phase MoO 3 , γ‐Phase Mo 4 O 11 (MoO 2,75 –MoO 2,70 ) und σ‐Phase…

Organometallic Compounds Synthesis and CharacterizationCatalysis and Hydrodesulfurization StudiesCorrosion Behavior and Inhibition

The Mechanism of Colloid Agglomeration in the Formation of Bitter Patterns

C. Denis Mee1950-08-01Proceedings of the Physical Society Section A

A complete understanding of the method of colloid agglomeration in simple cases like those illustrated here is of great help in interpreting the more complicated patterns formed on cubic ferromagnetic single crystals, especially those due to secondary domain structure, owing to the greater number of directions of easy…

Coagulation and Flocculation StudiesPickering emulsions and particle stabilizationDiatoms and Algae Research

Notes on the Theory of Dielectric Breakdown in Ionic Crystals

H. Fröhlich、F Seitz1950-08-01Physical Review

A comparative discussion is given of the theories proposed by the authors on dielectric breakdown in ionic crystals.Received 17 April 1950DOI:https://doi.org/10.1103/PhysRev.79.526©1950 American Physical Society

Theoretical and Computational PhysicsGlass properties and applicationsPhotonic Crystals and Applications

Die Siliciummonoxyd‐Drucke über den festen Bodenkörpern Silicium und Siliciumdioxyd Mit 7 Abbildungen

Harald Schäfer、Reinhold Hörnle1950-08-01Zeitschrift für anorganische und allgemeine Chemie

Abstract Die Zusammensetzung von Bodenkörper und Gasphase im System Si, SiO, SiO wird untersucht. Danach werden die SiO‐Drucke gemessen, die sich bei 1050 bis 1200° C über Si und SiO 2 als Bodenkörper einstellen. Die Druckmessung erfolgt mit Hilfe der Effusionsmethode. Die Fehlerquellen dieses Verfahrens werden kurz b…

Advanced ceramic materials synthesis

The Infra-Red Spectrum of Borine Carbonyl and a Normal Coordinate Analysis of Axial WXYZ3 Molecules

Robert D. Cowan1950-08-01The Journal of Chemical Physics

The infra-red spectrum of borine carbonyl has been investigated in the region 2 to 25μ. Two perpendicular-type bands have been partially resolved, and indicate that the molecule is a symmetric top with symmetry C3v. A normal coordinate analysis of axial WXYZ3 molecules has been carried out and applied to H3BCO, the fo…

Molecular Spectroscopy and StructureSolid-state spectroscopy and crystallographyAdvanced Chemical Physics Studies