Materials Literature
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Abstract The dynamic properties of a natural vulcanized rubber containing carbon black were studied for dynamic tensions of amplitude varying greatly. It was shown that both the elastic responses and viscosity change with amplitude of oscillation and with concentration and type of carbon black. The effects of thermal…
A new method of estimating the equilibrium melting temperature, Tm, of a polymer isdescribed, and applied to polychlorotrifluoroethylene (PCTFE). Experimentally de-termined values of the so-called observed melting point,!F^(obs), are plotted as a function of the isothermal crystallization temperature, Tx. When freed o…
Abstract Es werden Darstellung und Eigenschaften einiger kristallisierter Azulen‐Tetracyanäthylen‐Komplexe und deren Umwandlung in 1‐ bzw. 3‐Tricyanvinyl‐azulene beschrieben.
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…
Received 22 November 1961DOI:https://doi.org/10.1103/PhysRevLett.7.442©1961 American Physical Society
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…
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…
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…
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…
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…
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…
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…
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…
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 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…
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…
Recounts the discovery of the drug germanin and its application to reduce deaths among animals and humans due to sleeping sickness in the tropics.
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…
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…
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…