Materials Literature
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Abstract The zeta potential of cellulose suspensions with resin and with butadiene‐styrene latex or acrylonitrile latex is independent of the quantity of the latex used. The addition of aluminium sulphate as an electrolyte leads to recharging of the particles. Mixed suspensions of 50% cellulose and 50% asbestos fibres…
Abstract The iron complex of tetrabenzporphine was prepared and characterized. Cyclic voltammetry, and UV absorption, EPR, and MCD spectroscopy have revealed that its monochloride and bisimidazole complexes are trivalent iron high- and low-spin complexes, respectively.
The short-circuit peak current and the electromagnetic short-circuit peak force appear at about 10 ms after the short-circuit inception. However, the maximum value of dynamic stress due to the electromagnetic forces may occur much later and depends on the fundamental frequency of the structure. A decrease in dynamic s…
Unmodified cotton and cotton fabrics finished with eight add-ons of THPOH-NH3 were subjected to thermogravimetric analysis in a vacuum and in nitrogen. Nitrogen had no effect on the thermogravimetric data. THPOH-NH3up to 6% add-on lowered temperatures of maximum pyrolysis rates and decreased the weight loss per unit w…
A two-stage, predominantly brittle wear-chip mechanism is developed which may describe fine polishing with diamond grit having sizes in the range 2–10 μm. (Coarser grits do not give a fine polished surface.) In the first stage, the size of the wear chips is determined by cracking in the elastic stress field behind the…
In order to remove the existing confusion in analyzing Raman spectra in terms of a system of coupled damped harmonic oscillators, we discuss the phenomenological theory of coupled modes. It is suggested that in the coupled modes analysis of Raman spectra, the poles of the decoupled susceptibility are the most importan…
Abstract Amorphous alloys Fe 40 Ni 40 B 20 and Fe 39 Ni 39 B 10 Si 12 exhibit a typical active/passive transition when anodically polarized in borate and/or phthalate buffer solutions, at pH = 4.0; 5.3;6.3 and 8.4. There is no large effect of Si on the anodic behaviour of the alloys in these media. Both alloys undergo…
<div class="htmlview paragraph">Dual phase steel offers potential for wheel weight reduction, but has not been completely succeeded, in part, because of a localized necking or a fracture during rim fabrication. This failure should be related to a softening in the weld heat affected zone (HAZ).</div> <di…
From leaves of Penstemon nemorosus T RAUTV . two new esteriridoids have been isolated. Iridoidic moieties are catapol and ajugol, both esterified with 8-hydroxy-2,6-dimethyl-2,6-octadienoic acid. The structure was established by spectroscopic methods and comparison with known compounds. Key Word Index Penstemon nemoro…
Abstract The notch sensitivity of high‐density polyethylene (HDPE), polypropylene (PP), and polybutylene (PB) was evaluated using uniaxial tensile deformation and fractographic analysis. Each polyolefin was tested at relatively low and high molecular weights (MW). Only the lower MW HDPE was found to be clearly notch‐s…
Manganian adalusites, (Al1-xMnx3+)2(O/SiO4), with 0·012 ≤ x ≤ 0·22 (viridines) were synthesized along the join Al2SiO5– ‘Mn2SiO5’ under the fO2 conditions of the MnO2/Mn2O3 buffer. Their stability, miscibility, and compatibility relations were determined through seeded runs as a function of pressure, temperature, and…
The positron techniques of lifetime and Doppler-broadening were applied to vacancies in graphite. Vacancies were introduced into highly-oriented pyrolytic graphite by irradiation with 2 MeV electrons and fission reactor neutrons. The lifetime of positrons trapped at the vacancies was determined as 245±5 ps. Lifetime s…
Abstract Being byproducts, palm soapstock, palm acid oil and palm fatty acid distillates (PFAD) have a wide range of quality and composition. They also consist of many impurities and minor components. Due to development of refining techniques. PFAD have largely replaced palm acid oil, especially in the producing count…
Abstract Cs 6 Ga 2 Se 6 can be prepared from mixtures of Cs 2 Se and Ga 2 Se 3 . The transparent single crystals of the moisture sensitive compound (m.p. 685 °C) crystallize in the monoclinic system with a = 848.0(5), b = 1364.4(5), c = 1111.5(5) pm, β = 126.22(5)° (T = -150 °C, Z = 2, space group P2 1 /c). The galliu…
The dislocation structure of plastically deformed ZnS crystals has been studied using transmission electron microscopy. It is shown that both total and partial dislocations are simultaneously available in the crystal. The total dislocations are dissociated into Shockley partials.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and molecular stereochemistry of anionic difluoro(meso-tetraphenylporphinato)iron(III), a high-spin six-coordinate iron(III) porphyrinate with an unusually expanded core and a hydrogen-bonded "distal" imidazoleW. Robert Scheidt, Young Ja Lee, Shoko Tamai, and Kei…
Three cells with trigonal, orthorhombic or hexagonal symmetry have been proposed to describe M 7 C 3 carbides. Examinations of heavily faulted chromium, iron, vanadium mixed carbides present in white cast irons and in chromium steels have been performed by means of electron microscopy and diffraction. Electron diffrac…
A structural model, based on Voronoi polyhedral cells partly filled with support and metallic catalyst, is proposed for interpreting the small-angle X-ray scattering of heterogeneous catalysts. The model's properties are described, and the model is applied to porous Al 2 O 3 and Pt/porous Al 2 O 3 . Surface areas calc…
Full spectral details in support of the earlier proposed structure 1a for the antitumor antibiotic ravidomycin are presented together with an account of chemical degradation products. A complete corroboration of structure is provided by cross correlation of 1 H and 13 C nmr for ravidomycin and its diacetate 1b.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular mobilities of individual constituent carbons of solid polyesters above Tg as studied by carbon-13 nuclear magnetic resonance spectroscopyFumitaka Horii, Asako Hirai, Kouichi Murayama, Ryozo Kitamaru, and Toshimitsu SuzukiCite this: Macromolecules 1983, 16, 2, 273–2…