Materials Literature
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Measurements of the absorption spectrum of Si, made with high resolution, near the main absorption edge, at various temperatures between 4.2\ifmmode^\circ\else\textdegree\fi{}K and 415\ifmmode^\circ\else\textdegree\fi{}K, have revealed fine structure in the absorption on the long-wavelength side of this edge. This str…
Abstract From quantitative data reported by various investigators, it is concluded that the primary passive film on iron has the following properties: (1) 25–100 Å thick, (2) equivalent to 0.01 coulomb/cm 2 , (3) can oxidize CrO − 2 to CrO −− 4 , (4) follows the (Flade) potential relation —0.58 + .058 p H (volts). All…
The internal friction of BaTiO 3 ceramics has been studied under various conditions. It depends on temperature, biasing field and vibration amplitude, but is nearly independent of frequency and porosity. It is concluded that its main part is not caused by the ceramic and domain structures but is the property of the si…
Abstract Die Korrosionsvorgänge und Passivitätserscheinungen der metallischen Werkstoffe sind elektrochemischer Natur. Auf Grund dieses Zusammenhanges werden an Hand potentiostatischer Stromspannungs‐diagramme die charakteristischsten Erscheinungsformen der Metallpassivität erläutert. Es wird gezeigt, daß der passive…
1. Brilliant cresyl blue accumulates in the vacuoles of Desmarestia munda and D. herbacea and the accumulated dye appears purple, indicating that the pH of the vacuolar sap is less than 1.0 or greater than 7.5. However, the expressed saps of these two brown algae have pH 1.0 or less and about 2.0, respectively. The ou…
Abstract Polyethylene containing large quantities of carbon black can be crosslinked by a chemical free radical mechanism utilizing the thermal decomposition of dicumyl peroxide as the source of free radicals. Crosslinking in the presence of different types of blacks was studied in a liquid paraffin model system. The…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTrialkyl- and Triaryl(iso)cyanosilanes1T. A. Bither, W. H. Knoth, R. V. Lindsey Jr., and W. H. SharkeyCite this: J. Am. Chem. Soc. 1958, 80, 16, 4151–4153Publication Date (Print):August 1, 1958Publication History Published online1 May 2002Published inissue 1 August 1958https…
An idealized theoretical model of a yarn is assumed, and, after considering the stresses acting on a small element of the yarn, the conditions for radial equilibrium in the yarn are worked out. This leads to expressions for the tensile and transverse stresses in the fibres as functions of (i) the position in the yarn,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Addition of Silicon Hydrides to Olefinic Double Bonds. Part III. The Addition to Non-terminal Olefins in the Presence of Chloroplatinic AcidJohn C. Saam and John L. SpeierCite this: J. Am. Chem. Soc. 1958, 80, 15, 4104–4106Publication Date (Print):August 1, 1958Publicati…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRaman Spectra of Amino Acids and Related Compounds. VIII. Raman and Infrared Spectra of Imidazole, 4-Methylimidazole and Histidine1-3David Garfinkel and John T. EdsallCite this: J. Am. Chem. Soc. 1958, 80, 15, 3807–3812Publication Date (Print):August 1, 1958Publication Histo…
The infrared spectra of 17 amine hydrohalides have been measured in the solid state, in aqueous solutions, and in their conjugate amine. Their NH + stretching and scissoring bands are discussed.The stretching bands of hydrogen-bonded aliphatic and aromatic amine hydrohalides fall into the same part of the spectrum. In…
Neutron diffraction intensities have been computed for antiferromagnetic spin arrangements in the rock-salt-type structure. If the spin directions in the unit cell occur at relative angles other than 0\ifmmode^\circ\else\textdegree\fi{} or 180\ifmmode^\circ\else\textdegree\fi{}, the neutron scattering from powder spec…
Abstract Passivity in the transition metal alloys occurs at specific critical compositions which appear to be related to d ‐electron vacancies in the component metals and their tendency to fill with electrons. The d vacancies, measured in part by the magnetic saturation moment, favor formation of strongly chemisorbed…
Calcium aluminate glasses containing alkali oxides and iron oxide will transmit infrared radiation to about 6 μ and still have satisfactory working properties. Their refractive index, density, expansion, Young's modulus, modulus of rupture, fracture velocity, Knoop hardness, and some electrical and chemical properties…
Abstract The Griffith-model of brittle fracture of elastic solids and the model by Irwin and Orowan for the brittle fracture of elastic-plastic solids predict the propagation of cracks on the basis of energy supplied by the work of externally impressed forces and by the change of strain energy. Previous discussions ha…
SUMMARY: Poly-β-hy droxybutyrate has been previously shown to be a major component of bacterial ‘lipid’ granules. In the present study, the conditions under which it was formed and degraded by Bacillus cereus and B. megaterium were studied in washed suspensions. Suitable substrates for synthesis were glucose, pyruvate…
SUMMARY: Treatment of the cells of various Bacillus spp. with an alkaline solution of sodium hypochlorite resulted in dissolution of the cells and liberation of the intracellular lipid inclusion bodies. Analyses of the isolated and purified inclusions of Bacillus cereus grown under a variety of cultural conditions sho…
Electron transmission micrographs of polycrystalline aluminium quenched from ∼ 600°c into iced brine show that the specimens contain many dislocation loops with diameters of the order of several hundred Å. Some of the loops are hoxagonal in shape, and occur on (111) planes, and have a Burgers vector ½ [110] not in the…
In the frame-work of the crystalline field theory, the excited states of Cr 3+ in Al 2 O 3 and the optical transitions to these states are studied taking into account the effect of trigonal field and spin-orbit interaction. Initial splittings and optical anisotropies of the broad band (transitions to quartet states) a…
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