Materials Literature
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Hydrogen concentration depth profiles on surfaces of SiO 2 glass fractured slowly in water and rapidly in oil were determined by nuclear reaction analysis. It was found that water enters SiO 2 glass during slow crack growth in water.
Galvanic corrosion induced by plastic composite materials (graphite-epoxy-composite-materials, GECMs) coupled to metallic materials (ferrous and nonferrous) in neutral and air-saturated aqueous 3.5% NaCl solution has been investigated. Two types of composites, manufactured by Fiberite and Ciba-Geigy, were electrically…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparative effects on the surface area and pore structure of microporous heteropoly oxometalatesD. Lapham and J. B. MoffatCite this: Langmuir 1991, 7, 10, 2273–2278Publication Date (Print):October 1, 1991Publication History Published online1 May 2002Published inissue 1 Octo…
Abstract The synthesis and p‐ and n‐doping of polyacetylene, (CH) x , the prototype conducting polymer or “synthetic metal” is described together with a qualitative description of its band structure and changes in band structure on doping to yield positive and negative solitons. Other conducting polymers are briefly d…
We have measured the electric-field dependence of the reflectivity of the blue phase III (BP III) of cholesteric liquid crystals when the dielectric anisotropy ${\mathrm{\ensuremath{\epsilon}}}_{\mathit{a}}$0. We propose a model which assumes that the boundary aligns the sample to a depth L and in which L is increased…
The nucleotide and deduced amino acid sequences of the lacA and lacB genes of the Staphylococcus aureus lactose operon (lacABCDFEG) are presented. The primary translation products are polypeptides of 142 (Mr = 15,425) and 171 (Mr = 18,953) amino acids, respectively. The lacABCD loci were shown to encode enzymes of the…
Machine learning (ML) is transforming all areas of science. The complex and time-consuming calculations in molecular simulations are particularly suitable for an ML revolution and have already been profoundly affected by the application of existing ML ...Read More
Two new configurations for enhanced bending control of beams with in duced strain actuators are presented. In the first configuration the actuator is external to the beam and passes through selective points on the beam. Since the actuator is outside the beam, differential movement between the actuator and the beam is…
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V centers induced by ionizing irradiation at 80 or 300 K in single-crystal and polycrystalline ${\mathrm{MgAl}}_{2}$${\mathrm{O}}_{4}$ samples have been studied by use of electron paramagnetic resonance and optical absorption. ${\mathit{V}}_{\mathit{t}}^{\mathrm{\ensuremath{-}}}$ and ${\mathit{V}}_{\mathit{o}}^{2\math…
SUMMARY. Interspecific differences in diatom abundances in stream drift (plankton), immigration, and natural benthic assemblages were compared to assess the importance of emigration and immigration in benthic diatom community dynamics. Water samples were collected throughout a 24‐h period to measure diel changes in di…
Soluble (Tetraethylphthalocyaninato)iron(II) and ‐cobalt(II) Compounds The (tetraethylphthalocyaninato)iron and ‐cobalt compounds Et 4 PcFe (9), Et 4 PcCo ( 8 ), and Et 4 PcH 2 ( 7 ) have been synthesized starting from 3,4‐dibromoacetophenone ( 1 ) via the corresponding dinitrile 5 or isoindolenine 6 , respectively. E…
Abstract Samples of nucleated polyamide 6 were quenched from the melt so as to monitor cooling histories. Their morphology and crystal structures were discussed in relation to sample thermal history; cooling history relevant to quenched sample morphology was recognized as being confined in the interval 110 to 160°C. I…
Pour yourself a glass of beer and look closely at the rising bubbles. Careful examination shows that they are seldom distributed uniformly throughout the liquid. Instead, streams of bubbles appear to rise from certain spots on the surface of the glass. Closer inspection reveals that the bubbles rapidly grow in size as…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of poly(3-hydroxyalkanoate) (PHA) conjugates: PHA-carbohydrate and PHA-synthetic polymer conjugatesManssur Yalpani, Robert H. Marchessault, Frederick G. Morin, and Clevys J. MonasteriosCite this: Macromolecules 1991, 24, 22, 6046–6049Publication Date (Print):Octobe…
The ability to compare different constitutive models has been difficult in the past because the constants associated with these models are developed using different methods and test data. This work presents an explicit, consistent procedure for which constants can be determined for different constitutive models using…
The reduced niobium oxides ${\mathrm{Nb}}_{25}$${\mathrm{O}}_{62}$, ${\mathrm{Nb}}_{47}$${\mathrm{O}}_{116}$, ${\mathrm{Nb}}_{22}$${\mathrm{O}}_{54}$, and ${\mathrm{Nb}}_{12}$${\mathrm{O}}_{29}$ have been prepared in pure polycrystalline form by a niobium-metal gettering technique. They are related to the high niobia…
The instrumental resolution function for the Daresbury 9.1 high-resolution powder diffractometer has been measured as a function of wavelength, slit width and specimen geometry. It has been demonstrated that the effects of size and strain from the sample of annealed barium fluoride used as a reference material were ne…
The importance of hydrogenase activity to corrosion of steel was assessed by using mixed populations of sulfate-reducing bacteria isolated from corroded and noncorroded oil pipelines. Biofilms which developed on the steel studs contained detectable numbers of sulfate-reducing bacteria (10 increasing to 10/0.5 cm). How…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLuminescent europium(3+), terbium(3+) and gadolinium(3+) complexes of a branched-triazacyclononane ligand containing three 2,2'-bipyridine unitsLuca Prodi, Mauro Maestri, Raymond Ziessel, and Vincenzo BalzaniCite this: Inorg. Chem. 1991, 30, 20, 3798–3802Publication Date (Pr…