Materials Literature
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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.…
A double dipole model of the macrocyclic ring current in the dihydroporphyrin ring of chlorophyll derivatives is presented and parameterized. The model includes a close-range approximation that has both first-order and second-order continuity at all points in space, except through the current loop itself. The model is…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDoubly bridged double cubanes containing MFe3S4 clusters (M = Mo, W). Synthesis, structure, and conversion to spin-quartet single clusters in solutionW. H. Armstrong, P. K. Mascharak, and R. H. HolmCite this: J. Am. Chem. Soc. 1982, 104, 16, 4373–4383Publication Date (Print)…
Weight loss which occurs while sintering composited Si 3 N 4 powders requires the loss of one or more of the end‐member constituents through a volatilization reaction. By plotting the direction of the compositional change on the appropriate equivalence phase diagram, the principal volatilization reaction can be determ…
An electron spectrometer allowing energy- and angle-resolved spin-polarized photoemission from ferromagnets is described. The system is designed for use with samples magnetized perpendicular to the photoelectron extraction direction (transverse magnetization geometry) and a Mott detector (100 keV) for the spin-polariz…
Abstract The thermomechanical behavior of particle composites was investigated in their transition region. In particular, the value of the glass‐transition temperature T g , which constitutes an upper limit for the structurally important glassy region, was examined. According to experimental evidence existing in the l…
An amorphous thin plate of vanadium pentoxide, V2O5, prepared by ultrafast quenching from the melt (splat-cooling) has been examined by large-angle X-ray scattering (LAXS) and its structure thereby investigated. The intensities at 450 points within the θ range 2° < θ < 70° were measured at room temperature (22°C). The…
Starting from a N-particle diffusion equation, the effective particle (self-) and concentration diffusion coefficients of interacting Brownian particles are studied theoretically. These two diffusion coefficients defined by distinct ways are different for interacting systems. By taking into account both potential and…