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Screw Dislocations in Thin Rods
In connection with Galt and Herring's observation on thin whiskers of tin, the properties of a screw dislocation in a cylinder are worked out. When all boundary conditions are taken into account, the image force tends to keep the dislocation along the axis. Only when it is displaced about half-way to the surface does…
Some factors affecting the solubility of polymers
Abstract The solubility of a polymer in a non‐polymeric liquid depends mainly on the heat of mixing. When no polar forces are concerned, the cohesive energy densities of polymer and solvent must be close; a method is given for estimating the cohesive energy densities of polymers from a set of additive constants, and i…
Compression Strength of Porous Sintered Alumina and Zirconia
The influence of controlled porosity on the compression strength of sintered pure alumina and of partly magnesia‐stabilized zirconia was investigated. Bodies with porosities ranging from approximately 3 to 60% by volume were prepared utilizing hydrogen peroxide to induce pore formation. Cubes of approximately 1.2‐cm,…
States of Solid Methane as Inferred from Nuclear Magnetic Resonance
As there are different points of view concerning the molecular dynamical states in solid methane, especially concerning the $\ensuremath{\lambda}$-transition at 20.42\ifmmode^\circ\else\textdegree\fi{}K, we have investigated the manner in which the new method of nuclear magnetic resonance throws light on the problem.…
Neuere Ergebnisse der präparativen Hydrid‐Forschung
Abstract In den letzten 10 Jahren konnten, besonders nach der Auffindung des Lithiumaluminiumhydrids, zahlreiche neue Metallhydride und ‐doppelhydride entdeckt werden. Die Dreiteilung der Wasserstoff‐Verbindungen in salzartige, metallische und flüchtige Hydride hat sich bestätigt, wenn auch überall gleitende Übergänge…
Influence of Addition of Nickel on the Thermal Expansion, Rigidity Modulus and Its Temperature Coefficient of the Alloys of Cobalt, Iron and Chromium, Part I. Alloys with 10 and 20 Percent of Nickel
The influence of an addition of 10 percent and of 20 percent of nickel on the thermal expansion in the range of 10° to 50°, rigidity modulus at 20° and its temperature coefficient in the range of 20° to 50° of the alloys of cobalt, iron and chromium has been examined. The relations between those properties of nickel-a…
The quantitative separation of copper, lead and tin by cathodic deposition
G. H. Aylward and A. Bryson, Analyst, 1953, 78, 651 DOI: 10.1039/AN9537800651
Effect of Germanium on the Transformation of White to Gray Tin, at Comparatively Low Temperature
At a comparatively low temperature, gray tin may appear on white tin when the latter ( a ) is in contact with elementary germanium, ( b ) contains a certain proportion of germanium in the form of an alloy, or ( c ) is in contact with solutions in which certain germanium compounds have been dissolved. Data also are pre…
Physico-chemical Studies on the Skin and Leather of Marine Animals-VIII
The purpose of the present work is to obtain essential scientific knowledge on which basis an efficient method may be established for manufacturing leather or glue from the fish skin. With this view in mind, we measured the shrinkage temperature (Ts) of the animal skin. Specimens of which skins were employed as the te…
704. The anodic oxidation of metals at very low current density. Part II. Nickel
S. E. S. El Wakkad and S. H. Emara, J. Chem. Soc., 1953, 3504 DOI: 10.1039/JR9530003504
SUANITE, A NEW MAGNESIUM BORATE MINERAL FROM HOL KOL, SUAN, NORTH KOREA
A new mineral from the Hol Kol mine, North Korea of the composition Mg2B2O5, named suanite, has been described. The mineral is found usually as fibrous aggregates associated with kotoite and other borate minerals in marble which borders the gold-and copper-bearing diopside-clinohumite skarn mass. The crystal usually e…
Preparation and Properties of Iodide Vanadium
Massive vanadium was prepared by the hot‐wire reduction of vanadium iodide vapor by both the Van Arkel‐de Boer method and a straight‐flow process. The iodide decomposition provides an excellent method of obtaining small quantities of vanadium exceptionally low in nonmetallic impurities. Metal prepared by the straight‐…
Elektronenoptische Abbildung auf Grund der Wellenmechanik. I
Abstract Ausgehend von der Schrödinger‐Gleichung des rotationssymmetrischen elektrisch‐magnetischen Feldes wird die Existenz einer objektähnlichen Abbildung bewiesen. Die Wellenfunktion des paraxialen Bereiches wird dazu für jede beliebige Einstellebene durch den Verlauf der Wellenfunktion in der Objektebene ausgedrüc…
Raman effect in solids
A summary is given of the early work in this field, followed by an outline of the theoretical treatment of vibrations in crystals. The alkali halides have received a somewhat more detailed treatment than other substances. A bibliography is appended, giving references to many papers, covering more especially the last f…
440. Aromatic azo-compounds. Part I. Oxidation of cis- and trans-azobenzene
G. M. Badger, R. G. Buttery and G. E. Lewis, J. Chem. Soc., 1953, 2143 DOI: 10.1039/JR9530002143
Spontaneous Magnetization — Techniques and Measurements
Measurements on the temperature variation of spontaneous magnetization by both the magnetothermal and magnetic methods have hitherto been confined to nickel; the extension of these measurements, calling for greater sensitivity, is discussed. To the direct method devised by Weiss and Forrer has been added a direct curr…
Electroluminescent Zinc Sulfide Phosphors
The preparation of blue, green, and yellow electroluminescent zinc sulfide phosphors is described. The blue and green phosphors contain copper and lead, with the color being determined by the copper and chloride concentration. The yellow phosphors are triple‐activated, containing copper, lead, and manganese.
Dielectric Dispersion in the Microwave Region of Six Tetrasubstituted Methanes in the Solid State
A method is described for the measurement of dielectric constant and loss at microwave frequencies and low temperatures. The dielectric constant and loss at 3.22 cm wavelength (9.32×109 cycles/sec) have been measured over a range of temperature in the solid state and in the liquid near the melting point for t-butyl ch…
Studies on the Concept of Large Activator Centers in Crystal Phosphors
The explanation of the variation of efficiency with concentration of activator in terms of a large center, given by Ewles, was oversimplified. The recent suggestion of Johnson and Williams that an activator can only function as a luminescent center if no other activator occupies any of lattice sites surrounding it, le…