Materials Literature
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Other| February 01, 1996 Naturally occurring ferric iron sanidine from the Leucite Hills lamproite Scott M. Kuehner; Scott M. Kuehner University of Washington, Department of Geological Sciences, Seattle, WA, United States Search for other works by this author on: GSW Google Scholar Dave J. Joswiak Dave J. Joswiak Sear…
The present study provides results of the corrosion behaviour in Hank's physiological solution and some other properties of three Ti-Ni alloys with 18, 25 and 28.4 wt% Ni, respectively. Results indicate that alpha-titanium and Ti2Ni were the two major phases in all three Ti-Ni alloys. The relative amount of the Ti2Ni…
Magnesium aluminate whiskers were synthesized by an oxidation—reduction reaction between MgO, C, and Al in a CO and CO 2 atmosphere. The oxygen partial pressure suitable for MgAl 2 O 4 whisker growth ranged from 10 −12.1 to 10 −11.5 MPa. The average whisker diameter and length formed at 1500°C for 8 h were ∼3.1 μm and…
The substrate specificity of the NADP-dependent isocitrate dehydrogenase of Escherichia coli was investigated by combining site-directed mutagenesis and utilization of alternative substrates. A comparison of the kinetics of the wild-type enzyme with 2R-malate reveals that the gamma-carboxylate of 2R,3S-isocitrate cont…
An exploratory examination has been made of three different kinds of hardpans found in humus podzols (Humods and Aquods) of the coastal lowlands of southern Queensland, by means of slaking tests, a reactive aluminium test, acid oxalate and pyrophosphate extractions and electron microscopy. Samples from three indurated…
The exceptional properties of a new class of linear polymeric hydrocarbons, obtained by the polymerization of α-olefins, are described. The high melting points, the high degree of crystallinity, the low solubility, and the special mechanical properties of these polymers are attributed to a particular regularity of str…
Alumina granules charged with P were used as an amendment to improve the ability of a soilless medium to retain P and provide it to plants. Commercially available alumina was acidified, saturated with P, and evenly distributed in a medium of peat, vermiculite, and sand to grow potted marigolds ( Tagetes spp.) to a com…
The melt flow behavior of natural rubber composites containing untreated, acetylated and gamma ray irradiated coir fibers was studied using an Instron Capillary Rheometer. Coir fibers of length 10 mm were used at different loading, viz., 5, 10, 20 and 30 phr. The dependence of melt viscosity, flow behavior index (n′)…
Other| February 01, 1996 Ordering of the stacking sequence in cookeite with increasing pressure; an HRTEM study Michel Jullien; Michel Jullien Ecole Normale Superieure, Laboratorie de Geologie, Paris, France Search for other works by this author on: GSW Google Scholar Alain Baronnet; Alain Baronnet Search for other wo…
For almost a century now the phenomenon of stress corrosion cracking (SCC) has intrigued many but still continues to excite scientific controversy. This process can cause catastrophic failure in normally ductile alloys and is of serious engineering concern. Of particular importance is the case of transgranular (T) SCC…
We examine entanglements using monomer contacts between pairs of chains in a Brownian-dynamics simulation of a polymer melt. A map of contact positions with respect to the contacting monomer numbers (i,j) shows clustering in small regions of (i,j) that persists in time, as expected for entanglements. Using the ``space…
Abstract In Northwestern Mexico, the Miocene basins that disrupted the Sierra Madre Occidental Province are filled with sandstones and conglomerates (the Báucarit Formation) cemented mainly by zeolites of the heulandite-clinoptilolite group. Few volcanic tuffs are intercalated in the sediments for which four different…
Abstract The compatibility of blends of poly(2‐ethyl‐2‐oxazoline) (PEOX) with poly(2‐hydroxyethyl methacrylate) (PHEMA) and poly(2‐hydroxypropyl methacrylate) (PHPMA) was investigated by means of differential thermal analysis and infrared spectroscopy. Calorimetric results show single glass transition temperatures in…
The surface properties of polycaprolactone (PCL)–poly(ethylene glycol) (PEG) block copolymer (PCE) and blend (B-PCE) of PCL and PEG obviously affect the drug release behavior of the polymer. In this paper, both surface properties of PCE and B-PCE are studied and compared by measuring their water sorption and using the…
Linear polyurethane, linear segmented polyurethane, polyurethane networks, and polyurethane acrylate networks of various composition were synthesized. The variation of Tg with the type of macrodiol, its length, and the chemical composition of the polymer were studied in relation with the percentage of soft segments, t…
All articles of this category A new synthesis of a monofunctionalized β-substituted alkyl porphyrin, 2-(methoxycarbonylethyl)-8,12,13,17-tetraethyl-3,7,18-trimethyl porphyrin ( 1 ), is described. It involves the use of a novel ‘3+1’ connectivity approach. Specifically, the mono-substituted tripyrrane, 2,5-bis(5-carbox…
Potential‐pH diagrams are presented for the systems and . It is shown that the stability field of elemental silicon lies well below the water stability region, indicating that silicon is highly unstable in water relative to oxidation to Si(IV). Thus, the ability to suppress oxide formation must be attributed to kineti…
Polycrystalline oxide fibers have not yet been exploited to their full potential, perhaps because of difficulties with processability. In the successful new route for the production of continuous yttria‐stabilized zirconia fibers detailed here, ZrO 2 particles sols are used as oxide‐forming components. The fine‐graine…
The hardfacing industry has matured substantially since its inception in the early 1920s. Numerous welding alloys have been developed and field proven. By developing a strong working knowledge of available alloys, wear conditions and the specific wear situation, the goal of selecting the proper alloy to prolong servic…
Poly(acrylic acid) (PAA) was decarboxylated in aqueous solution as a function of pH and ionic strength in the temperature range 100–350°C. Degradation kinetics were first order with respect to acid functionality. The rate of decarboxylation at high pH (Eα = 51.1 kcal/mol) was much slower than that at low pH (Eα = 20.3…