Materials Literature
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The permeability of intact gas vesicles, isolated from the cyanobacterium Anabaena flos-aquae, to percyclofluorobutane (C4F8), has been investigated by two methods. Warburg manometry showed that a suspension of intact gas vesicles exchanges more C4F8 than an equivalent suspension of collapsed ones. Pressure nephelomet…
Abstract Previous investigators have indicated that stabilizers will block the transesterification catalyst in the preparation of PET by the DMT process. This was not the case when triphenyl phosphate (TPP) or Irganox 1010 was used as the stabilizer and manganous acetate as the catalyst. Stabilizers in this study incl…
The dynamics of a high-angle tilt boundary in a triangular lattice with a truncated Lennard-Jones potential has been simulated by the method of computer molecular dynamics. Boundary migration was observed at various temperatures above a threshold, and was interpreted in terms of small steps involving coupled sliding a…
The temperature variation of the refractive indices ( n o, n e) and density are reported for two liquid crystals. The order parameter is evaluated by both Vuks’ and Neugebauer's approaches. The possible sources of error in evaluating the order parameter from refractive indices measurements have been discussed. The con…
Ivory can undergo severe cracking and splitting when exposed to adverse environmental conditions. The anisotropic dimensional properties of ivory have been investigated under varied temperature and relative humidity conditions. Migration of moisture into and out of ivory was found to play the principal role in its exp…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEpoxidation of olefins by a polymeric reagent electrochemically generated and recycled in situJunichi Yoshida, Jiro Hashimoto, and Nariyoshi KawabataCite this: J. Org. Chem. 1982, 47, 18, 3575–3577Publication Date (Print):August 1, 1982Publication History Published online1 M…
Abstract Die neue Verbindung K 4 Si 4 Te 10 kristallisiert orthorhombisch (Raumgruppe Pnma) mit den Gitterkonstanten: a 2125,8(8) pm, b 1 200,5(7) pm, c 1 060,8(7) pm. In der Struktur sind SiTe 4 ‐Tetraeder ausgebildet, die über gemeinsame Ecken zu Adamantan‐analogen Si 4 Te 10 4− ‐Einheiten verknüpft sind.
Corrosion fatigue experiments have been carried out in a 0.5N and 4N sodium chloride solution with pH of 6.5 at 80 C. The solution has been air saturated. Two different chromium steels were examined, a tempered martensitic steel with 12% chromium and a pure ferritic steel with 18% chromium and 2% molybdenum. The resul…
Abstract Measurements were made of linear viscoelastic properties and nonlinear stress‐strain properties of phase‐separated styrene‐butadiene‐styrene (SBS) copolymers and their blends with several homopolymer polystyrenes (PS) and one random copolymer (SBR). Torsion pendulum testing yielded shear moduli G ′, G ″, and…
Abstract The technique of heat flow calorimetry was used to determine the specific heat of coffee and chicory products and to study their thermal behaviour above 20°C. Intensive exothermic reactions were particularly evident when measurements were made with sealed cells. The data obtained help in the understanding of…
A method has been developed to characterize the resistance of polymers to erosion by surface discharges. It was found possible to produce surface discharges on wet, contaminated surfaces without the usual disturbing influences of metal electrodes and wetting agents. Instrumentation was devised to monitor continuously…
Test apparatus and procedures were developed to test energized, non-contaminated, 120 kV system insulators under simulated freezing rain conditions. The flashover performances were compared between non-ceramic composite transmission line insulators and standard porcelain 53/4 x 10 inch suspension insulators. Standard…
A measurement method for determining thin-film acoustic properties, such as characteristic acoustic impedance, sound velocity, density, and stiffness constant, is developed with a simple measurement principle and high measurement accuracy. The acoustic properties are determined from a maximum reflection loss and a cen…
Neutron powder diffraction data have been collected for obtained from lead‐acid battery plates cycled in and . A comparison of total scattering cross sections for the hydrogenated sample vs. the deuterated sample indicates a bulk hydrogen concentration of 0.21 H atoms per unit. Rietveld refinements of the data yield t…
Abstract Spherical fine particles with various diameters (70, 160, and 400 Å and 35 μ) were mixed with low‐density polyethylene (LDPE). The oriented composites were made by necking drawing. Thus the oriented polymer composites were hexagonal symmetric. Their elastic properties were determined by five compliances or st…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe high-spin (5T2) .dblharw. low-spin (1A1) transition in solid tris(2,2'-bi-2-imidazoline)iron(II) diperchlorate. Hysteresis effects, simultaneous change of spin and lattice characteristics, and order-disorder phenomena of the perchlorate anionE. Koenig, G. Ritter, S. K. K…
Abstract A new process for making equal biaxially oriented films from liquid crystalline solutions of poly(p‐phenylene terephthalamide) (PPD‐T) is described. The process involves extruding solutions of PPD‐T/H 2 SO 4 through an annular die and over an oil‐coated mandrel into a coagulation bath. The films were studied…
Fifty large-type crossbred steers were assigned in groups of five to one of ten nutritional regimens to measure the effects of diet on collagen characteristics. Initially, steers in a control group were slaughtered at about 280 d of age and weighing 300 kg. Steers in the nine remaining treatment groups were fed either…
Abstract Compositional analyses of random copolymers of acrylamide with sodium‐2‐sulfoethyl methacrylate and with sodium‐2‐acrylamido‐2‐methylpropane sulfonate have been performed utilizing elemental analysis, infrared spectroscopy, and C 13 NMR. A mathematical method involving nitrogen to sulfur ratios has been devel…
Electrophysical properties and photoconductivity of several binary (PbTiO3, PbZrO3, PbHfO3) and ternary (Pb2ScNbO6, Pb2InNbO6) lead-containing perovskite-type oxides were investigated. Band gap energies for all studied compounds were measured to be somewhat smaller than for its perovskite analogs not containing lead.…