Materials Literature
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Abstract When exposed to the weather (moderate climate, Darmstadt), polymethylmethacrylate (PMMA) experiences weight changes, depending on the seasonal humidity, but no material loss. Polycarbonate (PC) on the other hand, and to a lesser degree PC with a “weather skin”, shows marked weight changes when exposed to arti…
Summary The mere presence of H2S in a wet oil or gas system may cause either weightloss corrosion or sulfide stress cracking (SSC) of carbon and low-alloy steels.in addition, H2S may enhance chloride stress corrosion cracking (SCC) ofstainless steels and other higher alloys. The likelihood that these phenomenawill occ…
Shell losses in shell-form power transformers are investigated, using a 2-D finite-element method into which a correction factor is introduced to take account of the third dimension. Lines of flux are plotted and a comparison is made with alternative calculation results. A 13.333-MVA shell-form power transformer now u…
Abstract Polarized, low frequency (5–400 cm −1 ) Raman scattering spectra in single crystals of sodium acid phthalate (NaAP) were measured at 295 and 115 K. Similarly, infrared scattering measurements were performed by FTIR reflection and transmission techniques at room temperature. Symmetry assignments and band descr…
Abstract The photophysics and photochemistry of N ‐amino‐substituted pyridinium salts were investigated. Electron transfer from the amino group to the pyridinium ring takes place in the singlet excited state. The fluorescence quenching and photoreactivity of these compounds is conditioned by this process. Irradiation…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxymitrone et 9α-O-Méthyl-oxymitrone, Nouveaux Dérivés Hexahydroxantheniques Isolés de Oxymitra kingiiP. Richomme, S. Sinbandhit, B. David, A. Hamid A. Hadi, and J. BrunetonCite this: J. Nat. Prod. 1990, 53, 2, 294–297Publication Date (Print):March 1, 1990Publication History…
During the period from 1955 to 1978, the insulation system of choice for motor windings in Japan was predominantly of the polyester type. Since there are still a number of polyester-insulated motors in the field, there is a demand for a reliable means of evaluating the residual life of these units, the ultimate goal b…
Chemical polymerization of aniline in five different protonic acids, HCl, H2SO4, HBr, HNO3, and acetic acid (HAc), has been studied. the resulting polymers are characterized by elemental analysis, thermogravimetric analysis, infrared and x-ray photoelectron spectroscopy, and electrical conductivity measurements. It is…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCross-polarization magic angle spinning carbon-13 nuclear magnetic resonance study of linear dextran crystallized from poly(ethylene glycol)-water solution at a high temperatureAsako Hirai, Tsukasa Ito, Fumitaka Horii, Ryozo Kitamaru, Kazukiyo Kobayashi, and Hiroshi Sumitomo…
1. Since prostaglandin E2 could play a role in idiopathic hypercalciuria, and considering the well-established hypocalciuric action of hydrochlorothiazide, we have evaluated the effect of 15 days' treatment with hydrochlorothiazide in 10 hypercalciuric male stoneformers on urinary Ca2+ and prostaglandin E2, as well as…
Mooney's viscosity equation, originally proposed for concentrated solids in liquid suspensions, has been tested for stable liquid in liquid emulsions. Nine different emulsion systems have been considered. In none of the cases considered, Mooney's equation is found to adequately describe the viscosity/concentration beh…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudies of mixed-valence linear-chain complexes crystallized at elevated pressures. Crystal structures of bis(ethylenediamine)platinum bis(ethylenediamine)dihaloplatinum tetraperchlorate (halo = bromo, iodo)Jeffrey B. Weinrach, Scott A. Ekberg, Steven D. Conradson, Basil I.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGlass transition temperatures of compatible block copolymersHidematsu Suzuki and Takeaki MiyamotoCite this: Macromolecules 1990, 23, 6, 1877–1879Publication Date (Print):March 1, 1990Publication History Published online1 May 2002Published inissue 1 March 1990https://pubs.acs…
Alloys with the composition Pr2(Fe1−xCox)17−yAly have been synthesized by the arc-melting technique followed by 125-h annealing at 900 °C in evacuated silica capsules. From room-temperature x-ray powder diffraction analysis a complete solid solution Pr2(Fe1−xCox)17−yAly has been observed for all values of 0≤x≤1 and 0≤…
A novel computer-aided optimizing procedure has been developed to obtain the geometry of the magnetic electron lens that give the minimum spherical aberration coefficient Cs. The minimization of Cs is done by a simplex method in which Cs is regarded as a function of up to 11 parameters characterizing the lens geometry…
Methods for producing large holographic diffraction gratings are described. In particular, the advantages of using a grating interferometer illuminated with a noncollimated beam from either an extended monochromatic source or an extended polychromatic source are described along with some of the problems that arise and…
Abstract Isocitric acid oxidative decarboxylation was realized in the absence and in the presence of homoionic Na + -, Mn 2+ -, and Cu 2+ -montmorillonite. The catalytic activity of the clay depends upon the nature of the interlayer exchangeable cation. Isocitric acid is transformed into α-ketoglutaric acid under the…
Boron nitride is a thermally stable and chemically inert material with a wide bandgap. As such, it has potential optoelectronic applications as windows, deep ultraviolet (UV) detectors, or UV light-emitting devices. Since it has a very high surface energy and a lattice parameter which is very similar to diamond, it ma…
The ThMn12-type Fe78Mo10Sm12 magnet has been characterized by high-resolution electron microscopy, x-ray microanalysis, and microdiffraction. In general, the microstructure of the mechanically alloyed and annealed magnets consists of the tetragonal 1:12 matrix phase with an average matrix grain diameter of 200–300 nm…
Oxidation of formaldehyde over supported platinum catalyst produced CO2 as a major product and CO as a minor product under a wide range of Inlet concentrations and reaction temperatures. The temporal variation of CO yield proceeded through a maximum suggesting that it was produced as an intermediate in the pathway lea…