Materials Literature
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Crystal structures of two hexagonal phases in Cu-Sb alloys have been studied by means of X-ray and electron diffraction as well as electron microscopy. A new long period superstructure with space group P6 3 /mmc is found in the range 16-19 at.% Sb ( ε phase), which is essentially an anti-phase modulation derived from…
Galvanic corrosion It is commonly held that it is the electrochemical potential between two surfaces that is the controlling factor for the rate of corrosion. Table 1.2 in chapter one of this series lists the standard oxidation potentials. However, the difference between the potentials of the two metals plus the diffe…
Abstract The helical structures of poly[( S )‐thiazolidine‐4‐carboxylic acid], in the cis and trans forms, were redetermined by using the new sets of bond angles and bond lengths established by X‐ray diffraction analysis of L ‐thioproline. Calculations of the helical structures of poly‐ L ‐proline and poly[( S )‐oxazo…
Studies are made to investigate the possibility of observing living organs in an electron microscope. An environmental cell is developed, which can be put on an ordinary specimen stage. Microorganisms in pond water are introduced into the environmental cell with water, and observed with a high voltage electron microsc…
Summary To produce a lattice expansion readily detectable by conventional X-ray photographic means in α -irradiated diamond, a dose of order 10 18 α .cm −2 is required. Such a dose could be produced by pitchblende in ∼2 × 10 8 yr. and a previously reported lattice expansion in a natural diamond could therefore have oc…
The absorption spectra of magnetic ions in crystalline solids, observed in the spectral range between approximately 5 and 200 cm −1 , are surveyed. The electronic excitations of single ions are considered first. The measurements of line positions, intensities and widths are discussed in terms of both static and dynami…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTShear Creep Studies of Narrow-Distribution Poly(cis-isoprene). III. Concentrated SolutionsNorio Nemoto, Tadatoshi Ogawa, Hisashi Odani, and Michio KurataCite this: Macromolecules 1972, 5, 5, 641–644Publication Date (Print):September 1, 1972Publication History Published onlin…
1. Collagen was extracted from chick skin with dilute acetic acid followed by dilute acetic acid containing pepsin. 2. The solubilized collagens were purified and portions subjected to further digestion by pepsin. 3. This treatment decreased the aldehyde content but contamination by hexosamine was not diminished. 4. P…
Babingtonite, Ca 2 (Fe,Mn,Mg)FeHSi 5 O 15 , from the Yakuki mine, Japan, has triclinic space group P [unk] and unit-cell constants a = 7.509 ± 0.019 Å, b = 11.697 ± 0, 028 Å, c = 6.719 ± 0.017 ±, α = 91.433 ± 0.041°, β = 93.886 ± 0.030°, γ = 104.255 ± 0.029°, and Z = 2. Three-dimensional intensities were collected wit…
Abstract When the dusty gas diffusion equation is applied to materials containing pores with radii below 50 Å, the observed diffusion behavior in these smaller pore systems can be quite different from that predicted by the equation. Higher temperatures and in some cases higher pressures tend to lessen the deviations b…
Abstract The structures of two new norditerpenoid dilactones, nagilactone E and F, are proposed. A dual biological activity of nagilactones (inhibitory and promotive) for plant growth is also reported.
The DC electrical breakdown of SF6 gas at extra-high- voltages was studied experimentally in coaxial systems of moderate size. The results were compared to a similarity relationship of electric stress for breakdown based on ionization of the gas. For laboratory-clean systems, theory and experiment agree when the macro…
Abstract The self heating characteristics of a series of activated carbon samples have been studied in relation to their chemical/physical properties. It appears that ease of self heating is related to the oxygen content of the carbon on a dry ash free basis, and from this it can be shown that all carbons manufactured…
Abstract Die Umströmung von einzelnen Kugelblasen mit innerer Zirkulation wurde theoretisch untersucht. Die Differentialgleichungen, die das Geschwindigkeits‐ und Druckfeld in der Umgebung der Blase beschreiben, berücksichtigen die vollständigen Trägheitsglieder. Die Rechnungen haben ergeben, daszlig; sich die Strömun…
Abstract Resonance absorption spectra of Fe 57 in Co x Zn 1− x Fe 2 O 4 (for x = 0.3, 0.5, and 0.75), in the temperature range from 80 to 700 °K, are discussed. The modulated lineshapes of the magnetic hyperfine spectra show features which are characteristic of relaxation effects. The theoretical line shapes, computed…
Abstract The role of mixtures of reactive bromine and phosphorus flame‐retardant polyol intermediates as well as the individual bromine and phosphorus reagents in suppressing combustion of flexible polyurethane foams was investigated by means of the oxygen index flame test and charring techniques. Bromine alone appear…
Abstract Literature relating to the fundamental nature of the fibrous state is reviewed with the goal of illustrating evidence for the existence of a possibly fundamental morphological unit, the elemental microfiber or fibril. Following a short summary of the rather well documented situation in natural fibers, the pro…
The microwave losses in polycrystalline ferrites can be separated into two parts: those associated with resonance (inhomogeneous linebroadening and two magnon processes) and intrinsic losses. In recent years, both types have been studied in great detail. The near-resonance relaxation can be quantitatively explained by…
Abstract The experimental evidence for stress generation in growing oxide scales is briefly summarised, and the origin of these stresses is discussed. The limited experimental data related to oxide adhesion is discussed, and it is concluded that the adhesion between metal and oxide probably involves chemical interacti…
A methyl methanesulfonate sensitive mutant