Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGas-phase reactions of hydroxyl radicals with the fuel additives methyl tert-butyl ether and tert-butyl alcohol over the temperature range 240-440 KTimothy J. Wallington, Philippe. Dagaut, Renzhang. Liu, and Michael J. KuryloCite this: Environ. Sci. Technol. 1988, 22, 7, 842…
The gene (nprM) for the highly thermostable neutral protease of Bacillus stearothermophilus MK232 was cloned in Bacillus subtilis using pTB53 as a vector. The nucleotide sequence of nprM and its flanking regions was determined. The DNA sequence revealed only one large open reading frame, composed of 1656 base pairs an…
A solid-state reaction process for producing ohmic contacts to polished natural semiconducting diamond surfaces is discussed. The approach attempts to systematically characterize the processes which occur when metallic films of known thickness are deposited on a smooth diamond surface and annealed in the solid state u…
X-ray absorption spectra have been measured using electron detection with both vacuum and helium gas surrounding the samples. The samples consisted of thin iron films covered with various thicknesses of aluminum to determine the contribution versus depth. The height of the iron K--absorption-edge jump decreases expone…
The creep behavior of a commercial grade of reaction‐bonded silicon carbide was characterized at a temperature of 1300°C. Creep occurred more easily in tension than in compression. At a given applied stress, the steady‐state creep rate in tension was found to be at least 20 times that obtained in compression. In both…
Abstract The reaction of the OH radical with some carboxylic and hydroxycarboxylic acids was investigated by trapping the resultant radicals as endgroups of poly(methyl methacrylate), which were detected and estimated by the sensitive dye partition technique. The rate constants of the reaction at 25°C and p H = 1.0 wi…
Abstract One of the major reasons coatings are used in internal combustion engines is to enhance the oxidation/corrosion resistance in contaminated corrosive environments. Such atmospheres are often encountered in diesel and utility gas turbines. Aircraft gas turbines are usually subjected to simple oxidation conditio…
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Both silicon carbide and aluminum silicon carbide have simultaneously been obtained directly from naturally occurring aluminosilicate by carbothermal reduction for the first time. A precursor of a montmorillonite–polyacrylonitrile (PAN) intercalation compound was heated at 1700°C in Ar. For comparison, montmorillonite…
Diaspores are disseminules specialized for dispersal and for other functions contributing to seedling establishment and seedling vigor. The winterfat (Eurotia lanata) diaspore consists of hairy bracts enveloping a utricle. Testa, embryo, and perisperm make up the enclosed seed. This general diaspore morphology also oc…
Abstract The existence of spin‐polarized complexes or magnetic polarons in magnetic semiconductors has been suggested theoretically some time ago, but up to now there is little experimental evidence of this phenomenon. With this in view, electron paramagnetic resonance is investigated ( g ‐factor and linewidth tempera…
A synthetic route is described for making carbothermally reduced powders from colloidal oxide precursors trapped in a polymer matrix. The entrapping resin, which is formed by polymerization of a monomer dissolved in the colloid, serves both to minimize particle agglomeration during reaction and as the source of carbon…
Abstract The α, γ, γ * polymorphous forms and the physical mixtures of the α and γ‐like forms of Nylon 6 were examined from room temperature up to the melting point by X‐ray diffraction techniques. The α‐ and γ * ‐forms evinced a more evident structural change as a function of temperature than the γ‐form. The study ca…
A study of two similar actinomycete strains, NRRL B-16109 and NRRL B-16110, demonstrated the presence of both the meso and ll isomers of diaminopimelic acid in whole-cell hydrolysates, typical of the genus Kitasatosporia Omura et al. These strains also had a phospholipid composition (type PII; diagnostic constituent,…
The low-heat-rejection (LHR) diesel promises decreased engine fuel consumption by eliminating the traditional liquid cooling system and converting energy normally lost to the coolant into useful shaft work instead. However, most of the cooling energy thus conserved is transferred into the exhaust stream rather than au…
For pt.II see ibid., vol.3, no.3, p.931-8 (1988). Extensive investigations into various phases of discharge development in SF/sub 6/ (corona formation, streamer to leader transmission, leader, and propagation) are summarized, with the goal of familiarizing the engineer with the theoretical and empirical basis of a qua…
Losses were measured during short-circuit tests on a 262.5 MVA, three-phase, five limb converter transformer at various frequencies from 50 Hz to 1 KHz. Using these and the calculated values of the harmonic currents produced by the AC/DC converter, load losses were determined. Variations of these losses with the conve…
The surface reaction products associated with the hydrolysis of ZBLA glasses have been characterized using X‐ray photoelectron spectroscopy. The predominant surface reaction product in water and basic solutions is a zirconium (hydr)oxy‐fluoride species. The compositional analyses indicate that the (hydr)oxyfluoride wh…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTreatment of coal devolatilization in comprehensive combustion modelingB. Scott Brewster, Larry L. Baxter, and L. Douglas SmootCite this: Energy Fuels 1988, 2, 4, 362–370Publication Date (Print):July 1, 1988Publication History Published online1 May 2002Published inissue 1 Ju…
Vickers and Knoop indentation tests have been used to study the fracture and deformation characteristics of 9.4‐mol%‐Y 2 O 3 ‐stabilized ZrO 2 single crystals. K c is anisotropic, with values of 1.9 and 1.1 MPa·m 1/2 for radial cracks propagating along (100) and (110), respectively. The toughness for these two orienta…