Materials Literature
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The decrease in corrosion resistance of 316L stainless steel due to static stress was studied in vitro using a 37 degree C Ringer's solution electrolyte. Both potentiodynamic polarization and coulometric techniques were used. Cyclic anodic polarization tests with highly loaded fracture mechanics samples revealed a low…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics and mechanism of the boron trichloride-catalyzed thermal ring-opening polymerization of hexachlorocyclotriphosphazene in 1,2,4-trichlorobenzene solutionMichael S. Sennett, Gary L. Hagnauer, Robert E. Singler, and Geoffrey DaviesCite this: Macromolecules 1986, 19, 4,…
Fine Si 3 N 4 powders were prepared by the combustion reaction of an Si powder compact undez 10 MPa nitrogen pressure. Addition of Si 3 N 4 powder to the starting Si promoted conversion of the reactants to homogeneous Si 3 N 4 particles. Submicrometer SisN 4 powders with a uniform size distribution around 0.5 μm were…
The amount of electric charge induced on a sample powder surface by contact with another reference powder has been measured by using a blow‐off method. Samples are three binary inorganic compound systems, consisting of 36 oxides, 15 fluorides, or 13 sulfides of various metal elements. Though the blow‐off charge depend…
Sintered α-SiC was examined in both oxidation and hot corrosion with a burner rig at 400 kPa (4 atm) and 1000°C with a flow velocity of 94 m/s (310 ft/s). Oxidation tests for times to 46 h produced virtually no attack, whereas tests with 4 ppm Na produced extensive corrosion in 13.5 h. Thick glassy layers composed pri…
The secondary alcohol oxidase from Pseudomonas sp. catalyzed the oxidation of various vinyl alcohol oligomers with the molecular weight of 220 to 1500 and of β-ketols such as 5-hydroxy-3-heptanone, 4-hydroxy-2-nonanone, 3-hydroxy-5-nonanone, 6-hydroxy-4-nonanone, 7-hydroxy-5-dodecanone, and 8-hydroxy-6-tridecanone. β-…
The steady-state release of active noble gas and iodine from defective fuel elements is described either in terms of a kinetic or a diffusion model. Both models assume a diffusional release in the fuel. Transport of fission products in the fuel-to-sheath gap is represented either by a first-order rate process or diffu…
At the tip of the lower beak of the chicken there were found 15-20 specialised dermal papillae containing large numbers of mechanoreceptors. The Merkel or Grandry corpuscles were situated distally in the papillae and at the papillae base was a collection of Herbst corpuscles. The apex of the papillae, under the scanni…
The sintering behavior of β‐SiC powders with additions of Al, B, and C was studied at 1600° to 1800°C with applied pressures of 20 to 60 MPa. Ceramics with densities of ∼3.08 g/cm 3 were obtained by hot‐pressing at 1650°C and 50 MPa. The bending strength did not degrade up to 1200°C. A large amount of a second phase,…
Embryos of Spisula solidissima (Bivalvia); Crepidula fornicata, C. convexa, Ilyanassa obsoleta (Gastropoda: Prosobranchia); and Dendronotus frondosus, Aeolidia papillosa, and Hermissenda crassicornis (Gastropoda: Opisthobranchia) were reared in the laboratory and examined periodically to determine when shell mineraliz…
This paper presents the results of an evaluation of the statistical distribution of electromigration test failures. Large scale life tests were carried out and the natujre of the failure distributions were determined for lines of varying length and width. In all cases, the distribution were found to be log-normal down…
Lamellar ZrC‐ZrB 2 and Chinese‐script ZrC‐TiB 2 eutectics were directionally solidified using the floating‐zone method of crystal growth. The Knoop microhardness, fracture toughness, and wear resistance were investigated as a function of the phase spacing. Nearly all of the direction ally solidified specimens exhibite…
Diatom frustules are rapidly and inexpensively cleared of protoplasts using commercially available bleach (5.25% sodium hypochlorite). A comparison of periphyton subsamples cleaned by the bleach method described, and the standard nitric acid/potassium dichromate method, showed little difference in the extent to which…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and tungsten-183 NMR characterization of vanadium-substituted polyoxometalates based on B-type tungstophosphate PW9O349-precursorsPeter J. Domaille and George WatunyaCite this: Inorg. Chem. 1986, 25, 8, 1239–1242Publication Date (Print):April 1, 1986Publication His…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoreactions of the triruthenium cluster Ru3(CO)12 and substituted analogsMarc F. Desrosiers, David A. Wink, Ray. Trautman, Alan E. Friedman, and Peter C. FordCite this: J. Am. Chem. Soc. 1986, 108, 8, 1917–1927Publication Date (Print):April 1, 1986Publication History Publ…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrdered structure in aqueous polysaccharide. 5. Cooperative order-disorder transition in aqueous schizophyllanTakashi Itou, Akio Teramoto, Takasuke Matsuo, and Hiroshi SugaCite this: Macromolecules 1986, 19, 4, 1234–1240Publication Date (Print):April 1, 1986Publication Histo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProton and carbon-13 NMR analysis of poly(β-hydroxybutyrate) isolated from Bacillus megateriumYoshiharu Doi, Masao Kunioka, Yoshiyuki Nakamura, and Kazuo SogaCite this: Macromolecules 1986, 19, 4, 1274–1276Publication Date (Print):April 1, 1986Publication History Published o…
Some organisms are capable of exerting exquisite control ower the crystals they form. Key components in this process are unusually acidic proteins (aspartic acid-rich). In this study we use a series of calciun dicarboxylic acid salts to investigate in vitro how these proeins are capable of interacting specifically wit…
The physical and electrochemical coloration characteristics of tungsten oxide films rf sputtered from a compressed powder WO3 target have been investigated. Oxide films with 3600–9800 Å thickness were deposited on substrates maintained at 200 °C at a total pressure of 0.5–8×10−2 Torr in Ar gas or an Ar-0.5-50% O2 gas…
Abstract Electro microscopy was used to study the phase separation kinetics of a polystyrene/polyvinylmethylether system subjected to a critical deep quench. The size of the phase‐separated domains was found to increase linearly with time, implying that hydrodynamic effects control the rate of growth of the domains in…