Materials Literature
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Systematic measurement of the electrical transport phenomena of black phosphorus grown by the all-closed bismuth-flux method has been performed in the range from room temperature down to 0.5 K for the electrical resistivity and down to 1.5 K for the Hall effect and the magnetoresistance effect. These samples exhibited…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn investigation of the interdiffusion of polystyrene and deuterated polystyrene using surface-enhanced Raman scatteringP. P. Hong, F. J. Boerio, S. J. Clarson, and S. D. SmithCite this: Macromolecules 1991, 24, 17, 4770–4776Publication Date (Print):August 1, 1991Publication…
Abstract Eighteen sterols were isolated from the aerial parts of Kalanchoe pinnata (Crassulaceae) including four novel sterols, viz. (24 R )‐stigmasta‐5,25‐dien‐3β‐ol (24‐epiclerosterol), (24 R )‐5α‐stigmasta‐7,25‐dien‐3β‐ol, 5α‐stigmast‐24‐en‐3β‐ol, and 25‐methyl‐5α‐ergost‐24(28)‐en‐3β‐ol. 24‐Epiclerosterol and its Δ…
Seasonal changes in the assemblage structure of dominant epipelic diatoms were studied along a transect crossing a salt marsh, sandflat, and mudflat of an estuarine intertidal shore at Berrow Flats, Somerset, UK. Seasonal changes in cell numbers displayed different patterns in the salt marsh and sandflat/mudflat. At s…
In the 〈110〉{001} slip system in L12 ordered alloys, both screw and edge dislocations may become locked by dissociating into nonplanar structures. In this paper the structure of edge dislocations in the [110](001) primary cube system in Ni3Ga and Ni3(Al, Ti) single crystals has been observed with weak-beam and lattice…
Abstract The solubility of L ‐serine in water was measured as a function of temperature, and the solubility in methanol‐water solutions was determined as a function of temperature and methanol concentration. Solubility in aqueous solutions was found to be a linear function of temperature. Additionally, a statistical d…
We use experimentally determined crack growth data for silica glass and a fracture mechanics model for delayed failure to predict the fatigue behavior for high‐strength silica‐glass fibers. The results of this model indicate that fracture mechanics methods can be used to adequately describe the fatigue behavior observ…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and properties of mononuclear and ferromagnetically coupled dinuclear manganese complexes with 2,2'-biphenoxideAnn R. Schake, Edward A. Schmitt, Andrew J. Conti, William E. Streib, John C. Huffman, David N. Hendrickson, and George ChristouCite this: Inorg. Chem.…
High alloyed duplex stainless steels, referred to as super duplex, are being used increasingly for applications in corrosive environments. The higher Cr and Mo contents of these materials can lead to susceptibility to σ-phase precipitation, even during short time exposures to high temperatures. The 800°C aging of a hi…
The effects of corona wind on the heat transfer rate from a heated horizontal cylinder are described. Corona discharge and a corona wind are developed when a high voltage is applied to an electrode (emitter) near a grounded surface. In this study the corona wind is directed toward the lower region of the grounded cyli…
The molecular weight distributions of poly(ethylene terephthalate) fibers aminolyzed with selected primary amines (namely, methylamine, ethylamine, n-butylamine, and ethanolamine) were determined by using gel permeation chromatography. Initially the shape of the differential molecular weight distribution (DMWD) curve…
Magnetization measurements reported for ${\mathrm{Fe}}_{3\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Ti}}_{\mathit{x}}$${\mathrm{O}}_{4}$ in the composition range 0\ensuremath{\le}x\ensuremath{\le}0.55 were used to determine the magnetic-anisotropy coefficients as a function of x and of temperature. Magnetic measurem…
(1991). Statistical Methods in Accelerated Life Testing. Technometrics: Vol. 33, No. 3, pp. 360-362.
This is the first in a pair of papers describing the development of the computational corrosion analysis accomplished at the Naval Underwater Systems Center and the University of Connecticut over the past decade. This paper outlines the mathematical representation of the corrosion problem to be solved in terms of the…
An analysis is presented of two schemes which have been proposed for the determination of the temperature dependence of homogeneous crystal nucleation rates in glasses via DTA measurements. The first method is based upon the postulate that the inverse of the temperature at which the DTA crystallization rate is maximum…
The growth of VO2 and V2O3 thin films by reactive sputtering has been investigated. Previously reported studies of such thin films have often presented ambiguous results concerning the precise nature of the layers produced. A thorough and comprehensive characterization program including x-ray diffraction, scanning ele…
Abstract In order to render the surface of silicone hydrophilic without changing its bulk properties, acrylamide was grafted onto its surface. A silicone sheet was first treated with a corona discharge in air to introduce peroxides onto the surface. The concentration of peroxide introduced to the surface was determine…
The synthesis and dopaminergic activity of a series of C3 and nitrogen-substituted 1-(aminomethyl)-3,4-dihydro-5,6-dihydroxy-1H-2-benzopyrans (isochromans) is described. The synthesis of the compounds was stereospecific for the 1,3 cis isomer, and the enantioselective synthesis of both enantiomers of one of the analog…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTResonance Raman characterization of ferric and ferryl porphyrin .pi. cation radicals and the FeIV:0 stretching frequencyShinji Hashimoto, Yasuhisa Mizutani, Yoshitaka Tatsuno, and Teizo KitagawaCite this: J. Am. Chem. Soc. 1991, 113, 17, 6542–6549Publication Date (Print):Aug…
Abstract Meadowfoam dimer acids have been prepared in a thermal clay‐catalyzed reaction. Reaction conditions have been optimized, and yields of 44% were obtained with 2% water and 6–8% of an acid‐washed montmorillonite clay, based on the meadowfoam fatty acids. Purity of the distilled dimer acids was 79–89% with most…