Yield envelopes: identification and geometric properties
Keywords: clays ; critical state ; overconsolidation ; state boundary surface ; symmetry ; yield envelopes ; yielding ... Show All
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Miscibility mapping in some blends involving poly(styrene‐co‐acrylonitrile)
Abstract Binary interaction parameters, X ij have been determined for the monomer pairs, styrene‐acrylonitrile and methyl methacrylate‐acrylonitrile from phase separation measurements in homopolymer‐copolymer blends. These have been used to predict regions of miscibility in different blends of statistical copolymers w…
Corrosion of Electronics: The Role of Ionic Substances
Abstract not Available.
Preparation of Zinc- and Aluminum-Substituted Cobalt-Ferrite Thin Films and Their Faraday Rotation
Zinc- and aluminum-substituted cobalt-ferrite thin films were prepared on fused quartz substrates using vacuum evaporation followed by heat treatment. Magnetic measurements and X-ray diffraction analyses of the films showed that zinc and aluminum were successfully substituted in the spinel lattice and that the Curie t…
Tetraoxaporphyrinogen (Tetraoxaquaterene): Oxidation to the Tetraoxaporphyrin Dication
The well known, extremely reactive [18]annulene 1 and the hypothetical isomer 2 should be capable of being stabilized by CH2- and CHCH-groups as internal and external bridges, respectively. The corresponding hydrocarbons, 3 and 4, are still unknown, although they are of great interest as links between the non-natural…
Electrochemical Characteristics of Alkali‐Metal Doped Polyacetylene Electrodes
The doping and undoping characteristics of alkali‐metal doped polyacetylene are investigated using cyclic voltammetry and complex impedance measurement techniques. Reversibility, charge transfer resistance , double layer capacitance , and general impedance behavior are discussed.
Inclusion Size and Sintering of Composite Powders
Ceramic powders containing dispersed inert particulates often exhibit dramatically lower densification rates than the pure powder. This decrease results from the shrinkage incompatibilities of the matrix and the inclusion during densification. The analyses of this phenomenon all predict that the shrinkage rate is only…
In vitro simulation of biocompatibility of Ti‐Al‐V
The presented data are the result of a reappraisal of the biocompatibility properties of titanium alloys. An in vitro study has been conducted using Hanks' solution with four different additional compounds (EDTA, l-leucine, Na-citrate, and 8-hydroxyquinoline). A measurable dissolution rate was observed for Ti and Al i…
Results of apparent atomic oxygen reactions with spacecraft materials during Shuttle flight STS-41G
Covers advancements in spacecraft and tactical and strategic missile systems, including subsystem design and application, mission design and analysis, materials and structures, developments in space sciences, space processing and manufacturing, space operations, and applications of space technologies to other fields.
Molecular conformation of polyaniline oligomers: Optical absorption and photoemission of three-phenyl molecules
To examine the conformation of polyanilines with different degrees of oxidation two three-ring oligomers, N-N′-diphenyl-1,4-phenylenediamine (the ‘‘amine trimer’’) and N-N′-diphenyl-1,4-benzoquinodiimine (the ‘‘imine trimer’’) have been studied. The amine and imine trimers are model molecules for leucoemeraldine and p…
Synthesis, NMR characterization, and electrical properties of siloxane-based polymer electrolytes
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, NMR characterization, and electrical properties of siloxane-based polymer electrolytesRalph Spindler and D. F. ShriverCite this: Macromolecules 1988, 21, 3, 648–654Publication Date (Print):March 1, 1988Publication History Published online1 May 2002Published inissu…
An XPS study of the composition of thin polyimide films formed by vapor deposition
Films of polyimide (>8 nm) were formed on a polycrystalline silver surface following heating of a vapor-deposited layer of 4,4,-oxydianiline (ODA) and 1,2,4,5-benzenetetracarboxylic anhydride (PMDA). The imidization reaction leading to polymer formation was followed in situ with X-ray photoelectron spectroscopy. Th…
Degradation Mechanisms of Silicon Carbide Fibers
The effects of high temperatures on polymer‐derived Nicalon and chemically vapor‐deposited (CVD) SiC fibers have been investigated by mass‐spectrometric vapor pressure studies and by SEM observations of exposed fibers. Vaporization is kinetically limited for both materials; the predominant species vaporizing from Nica…
The aluminum–polyimide interface: An electron-induced vibrational spectroscopy approach
Clean polyimide films spin-coated onto gold substrate have been fully characterized by high resolution electron energy loss spectroscopy (HREELS): 19 electron-induced vibrational bands could be resolved and assigned by comparison with IR spectroscopy. The attribution of these peaks constitutes a firm and necessary bas…
High Resolution Deposition of Silver in Nafion Films with the Scanning Tunneling Microscope
Abstract not Available.
Ultra-low-noise cryogenic high-electron-mobility transistors
Quarter-micrometer gate-length high-electron-mobility transistors (HEMTs) for cryogenic low-noise application with very low light sensitivity have been developed. At room temperature, these exhibit a noise figure of 0.4 dB with associated gain of 15 dB at 8 GHz. At a temperature of 12.5 K the minimum noise temperature…
Magnetic and spectroscopic characterization of an iron porphyrin peroxide complex. Peroxoferrioctaethylporphyrin(1-)
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic and spectroscopic characterization of an iron porphyrin peroxide complex. Peroxoferrioctaethylporphyrin(1-)Judith N. Burstyn, James A. Roe, Andrew R. Miksztal, Ben A. Shaevitz, George. Lang, and Joan Selverstone. ValentineCite this: J. Am. Chem. Soc. 1988, 110, 5, 1…
Aldol Condensation Reaction between Formaldehyde and Acetone over Heat-Treated Synthetic Hydrotalcite and Hydrotalcite-Like Compounds
Abstract Synthetic hydrotalcite, Mg6Al2(OH)16CO3·4H2O, and its analogues were synthesized, heat-treated at 773 K, and used as catalysts for the title reaction to form methyl vinyl ketone (MVK) at 673 K. MVK was formed over all the catalysts examined, the highest MVK yield (20% on acetone basis) being found over the he…
Structural characterization by EXAFS spectroscopy of the binuclear iron center in protein A of methane monooxygenase from Methylococcus capsulatus (Bath)
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural characterization by EXAFS spectroscopy of the binuclear iron center in protein A of methane monooxygenase from Methylococcus capsulatus (Bath)Agneta. Ericson, Britt. Hedman, Keith O. Hodgson, Jeffrey. Green, Howard. Dalton, James G. Bentsen, Robert H. Beer, and St…
Crystal Structures of Organic Superconductor, (BEDT-TTF)2Cu(NCS)2, at 298 K and 104 K
Abstract The crystal structures of an organic superconductor (BEDT-TTF)2Cu(NCS)2 (Tc=10.4 K) at 298 K and 104 K are determined by X-ray analysis. The packing pattern of donors is nearly analogous to κ-(BEDT-TTF)2I3. The counter anion, Cu(NCS)2−, has no positional disorder and constructs a peculiar sheet where a copper…