Zur Kenntnis der Azulene, IX. Azulen‐π‐Komplexe
Abstract Es werden Darstellung und Eigenschaften einiger kristallisierter Azulen‐Tetracyanäthylen‐Komplexe und deren Umwandlung in 1‐ bzw. 3‐Tricyanvinyl‐azulene beschrieben.
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The structure of haemoglobin VIII. A three-dimensional Fourier synthesis at 5.5 Å resolution: determination of the phase angles
Abstract Determination of the phase angles of a crystalline protein requires a series of isomorphous heavy-atom compounds, with heavy atoms attached to different sites on the protein molecule. The asymmetric unit of horse oxyhaem oglobin was found to combine with heavy atoms at two different sites which are now known…
Ion-Pair Resonance Mechanism of Energy Transfer in Rare Earth Crystal Fluorescence
Received 22 November 1961DOI:https://doi.org/10.1103/PhysRevLett.7.442©1961 American Physical Society
Static Dielectric Constant of Rutile (TiO2), 1.6-1060°K
The static dielectric constant $\ensuremath{\epsilon}$ of rutile has been measured as a function of temperature from 1.6 to 1060\ifmmode^\circ\else\textdegree\fi{}K. Rutile does not appear to be ferroelectric or antiferroelectric in this temperature range. At low temperatures, $\ensuremath{\epsilon}$ approaches a limi…
über bi‐ und polycyclische Azulene, XLVIII. Einige Reaktionen von Azulen‐Aldehyden, ‐Nitrilen und ‐Carbonsäuren
Abstract Azulenaldehyde‐(1 bzw. 3) sowie die entsprechenden Nitrile und Carbonsäuren geben als Pseudoaromaten unter geeigneten Bedingungen Reaktionen der analogen benzoiden Verbindungen, wobei in einigen Fällen die funktionelle Gruppe abgespalten wird. Die Azulenaldehyde entsprechen in ihrem Reaktionsvermögen weitgehe…
Spin-lattice relaxation in rare-earth salts: field dependence of the two-phonon process
Abstract The field dependence of the two phonon process is computed taking into account hyperfine and dipolar fields. The general Gorter-Van Vleck-Hebel-Slichter (G.V.H.S.) formalism is adapted to the rare-earth ions, the effective Hamiltonian techniques of the previous paper being used. It is found that a distinction…
Spin-lattice relaxation in rare-earth salts
Abstract A general approach to spin-lattice relaxation is given for salts to which a crystalline field theory is appropriate. In particular, the theory of Elliott & Stevens for the interaction of a rare-earth ion with static ionic surroundings is generalized phenomenologically to represent the interaction of the r…
Health Aspects of the Commercial Melting of Radium Contaminated Ferrous Metal Scrap
Procedures and tests are described whereby it is shown that radium in ferrous metal scrap is virtually all removed in the slag on remelting. The smelting of radium-contaminated ferrous scrap can be performed with safety for the workers by use of proper ventilation and other simple precautions. The purified ferrous met…
A Modification of the Method for Defining and Measuring Crimp of Textile Fibers1
The main parameter used to describe the geometry of the crimp of a fiber is the crimp diameter. This corresponds to an average amplitude of the fiber in space while the fiber is kept in a static position of stress. In order to measure the crimp diameter, it is necessary to measure the coordinates of a sufficient numhe…
Harmonic Generation and Frequency Mixing in Ferromagnetic Insulators
When a transverse rf magnetic field is applied to a ferromagnetic insulator, a second harmonic frequency term arises in mz (the axial or longitudinal component of the rf magnetization). If in addition an axial component of the rf field is applied, then a second harmonic frequency term appears in mt (the transverse com…
Algal species lists
During the joint meeting of the British Phycological Society and the Soci~t~ Phycologique de France held in the Channel Islands in September 1960 a number of excursions were made to various localities in Guernsey, Herm and Sark.Algal records collected during these excursions are listed below.It should be realised that…
An Analysis of the Infrared Absorption Spectrum of Am+3(5f6) in LaCl3
The polarized infrared absorption spectrum of single crystals of Am+3(5f6) in LaCl3 has been studied from 0.79 to 16.0 μ. In almost every instance the spectrum is sharp and completely polarized, and appears in definite groupings. Transitions from the ground level, 7F0, to excited levels of the ground term, 7F1, 7F2, 7…
Fiber Configuration in Sliver and Roving and its Effect on Yarn Quality
Fiber configuration in sliver and the incidence of hooks in sliver and rovings have been studied, employing two different techniques. It has been established that during the drafting of sliver at draw frames, trailing hooks are removed preferentially as com pared to leading hooks. The direction of presentation of hook…
Rolling-Contact Fatigue Studies With Four Tool Steels and a Crystallized Glass Ceramic
The rolling-contact fatigue properties of crystallized glass ceramic balls together with AISI M-1, AISI M-50, Halmo, and WB-49 alloy steel balls tempered to various hardness levels were determined in the NASA spin rig and in the five-ball fatigue tester. A continuous increase in fatigue life and load capacity for each…
The discovery of Germanin by Oskar Dressel and Richard Kothe
Recounts the discovery of the drug germanin and its application to reduce deaths among animals and humans due to sleeping sickness in the tropics.
The reaction of ozone with surfaces of natural rubber, and its dependence upon strain
Abstract The progressive reaction of ozone with surfaces of natural rubber ( cis ‐polyisoprene) has been studied by means of replica electron microscopy. Unstrained rubber suffered surface degradation at a rate consistent with the predictions of a theory of diffusion with simultaneous chemical reaction. In strained su…
Properties of polyvinylidene fluoride. Part II. Infrared transmission of normal and thermally decomposed polymer
Abstract The infrared transmission of the plastic polyvinylidene fluoride has been measured. Normal and thermally decomposed samples were used. Bands yielding information on phase transitions and behavior during pyrolytic decomposition have been observed. The mechanism of thermal degradation is briefly discussed. Abso…
A study of pyrochlore and betafite
Pyrochlore and betafite were investigated from several types of Canadian occurrences. Nine new analyses for 20 constituents and 11 analyses for 8 constituents are presented. A general formula A 16 -xB 16 (O,OH) 48 (F,OH) 8 is proposed for the pyrochlore-betafite series with x representing vacant sites in the unit cell…
Thermodynamic properties of polystyrene and styrene
Abstract A Tarassov function has been used to estimate the specific heat of polystyrene between 0° and 60°K. These data, together with published C p data, have been used to calculate the entropy, enthalpy, and free energy of styrene and polystyrene from 0° to 298.16°K. The entropy of polymerization of styrene at 298.1…
Diffusion von Uran-233 in Urandioxyd
Die Selbstdiffusion von Uran in UO 2 -Sinterkörpern wurde mit Hilfe der a-Strahlungsabsorption sowie durch direkte Messung der (durch Diffusion sich einstellenden) Konzentrationsverteilung von U-233 bestimmt. Für Wasserstoffatmosphäre und im Temperaturbereich 1300 —1600°C gilt: D = 0,23 exp( —104,6 kcal/R T) cm 2 sec…