Materials Literature
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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…
Abstract The adsorption, chemisorption and oxide formation of molecular oxygen was studied on the (100) surface of molybdenum single crystal by following the changes in Mo 3d photoelectron lines and the characteristic losses in EELS. For estimation of the oxygen content, both XPS and AES were applied. At the room temp…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNMR of silk fibroin. 9. Sequence and conformation analyses of the silk fibroins from Bombyx mori and Philosamia cynthia ricini by 15N NMR spectroscopyTetsuo Asakura, Hiroaki Yoshimizu, and Fumihiko YoshizawaCite this: Macromolecules 1988, 21, 7, 2038–2041Publication Date (Pr…
This paper reviews the technology of some of the concepts which are applicable to electrically heated clothing systems, and which have been examined by the Ministry of Defence. Some of these systems are already in military and civilian use, whereas others are experimental. The essential features which an electrically…
Abstract Celluloses from a variety of common sources were analyzed for availabilities of O(2)H, O(3)H, and O(6)H in order to estimate the extent of hydrogen bonding on accessible fibrillar surfaces. Celluloses from flax, ramie, sisal, and wood (both cellulose I and II from wood) together with liquid NH 3 ‐swollen cott…