Materials Literature
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Abstract Sediments from depths to 670 m in the Barbados accretionary complex and transecting the décollement zone have been studied by transmission and analytical electron microscopy (TEM/AEM). The sediments consist of claystone and mudstone intercalated with layers of volcanic ash. Smectite comprises the bulk of the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of the exciton coupling on the optical and photophysical properties of face-to-face porphyrin dimer and trimer: a treatment including the solvent stabilization effectT. H. Tran-Thi, J. F. Lipskier, P. Maillard, M. Momenteau, J. M. Lopez-Castillo, and J. P. Jay-GerinCi…
We simulate one-dimensional crystal growth from an undercooled melt using a phase-field model and find interesting behavior when the liquid is undercooled by L/${\mathit{c}}_{\mathit{p}}$ degrees (``unit undercooling''). L is the latent heat and ${\mathit{c}}_{\mathit{p}}$ the specific heat. For smaller undercoolings,…
ADVERTISEMENT RETURN TO ISSUEPREVarticleNEXTFormation and reactivity of (tetraarylporphyrinato)rhodium(II) monocarbonyls: bent RhIICO complexes that react like acyl radicalsBradford B. Wayland, Alan E. Sherry, George Poszmik, and Andrew G. BunnCite this: J. Am. Chem. Soc. 1992, 114, 5, 1673–1681Publication Date (Print…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfrared and Raman studies of poly(p-phenylenevinylene) and its model compoundsAkira Sakamoto, Yukio Furukawa, and Mitsuo TasumiCite this: J. Phys. Chem. 1992, 96, 3, 1490–1494Publication Date (Print):February 1, 1992Publication History Published online1 May 2002Published in…
The frequencies of phonons with energies well above those of corresponding soft modes depend on the evolution of the structural order parameter as a function of temperature, pressure or chemical composition. The relative changes of the phonon frequencies are usually below 2% of their total energies (hence “hard modes”…
<div class="htmlview paragraph">Several methods to reduce ignition delay period were tested in combination with a high pressure injection and effects on combustion improvement were examined.</div> <div class="htmlview paragraph">It was found that the reduction of ignition delay does not give so much…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of poly(dichlorophosphazenes) from Cl3P:NP(O)Cl2. 1. Kinetics and reaction mechanismG. D'Halluin, R. De Jaeger, J. P. Chambrette, and P. PotinCite this: Macromolecules 1992, 25, 4, 1254–1258Publication Date (Print):February 1, 1992Publication History Published onli…
<div class="htmlview paragraph">An experimental data base of catalyst conversion efficiency was generated, using a tubular flow reactor which contained either a Pt/Rh (5:1; 40g/ft<sup>3</sup>) or a Pd/Rh (5:1; 40g/ft<sup>3</sup>) catalyst sample, for the purpose of updating the kinetic ra…
Various methods to measure fracture toughness using in‐dentation precracks were compared using soda‐lime glass as a test material. In situ measurements of crack size as a function of applied stress allow both the toughness K c and the residual‐stress factor χ to be independently determined. Analysis of the data showed…
In contrast to m-xylylene and related diradicals, bisnitroxide 1 has a singlet ground state according to ESR spectroscopic investigations. Diradical 1 can be isolated as two stable atropoisomers. In both, the free electron is possibly localized on the oxygen atom, because conjugation is prevented by the steric hindran…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of branched liquid-crystalline polyethers containing cyclotetraveratrylene-based disk-like mesogensV. Percec, C. G. Cho, C. Pugh, and D. TomazosCite this: Macromolecules 1992, 25, 3, 1164–1176Publication Date (Print):February 1, 1992Publication…
The electrodeposition of palladium particles at electronically insulating polyaniline and conducting polypyrrole films in aqueous solution has been investigated. The number density of particles and their overall surface area was calculated from current transients recorded during deposition at constant potential. Both…
Abstract 35 Cl, 81 Br, 121 Sb, and 209 Bi NQR of the title compounds was observed. According to the results of the temperature dependences of NQR frequencies and the DTA measurements, phase transitions take place in [N(CH 3 ) 4 ] 3 Bi 2 Br 9 (T tr =183K), [N(CH 3 ) 4 ] 3 Bi 2 Cl 9 (T tr = 155K), and (CH 3 NH 3 ) 3 Bi…
Abstract Monodisperse porous styrene‐divinylbenzene copolymer particles were prepared via seeded emulsion polymerization using a mixture of linear polymer (polystyrene seed) and non‐solvent as inert diluent. Experimental evidence was presented to describe the mechanism of formation of porous polymer particles during t…
The temperature and concentration distributions of hydrogen in a hot-filament chemical-vapor deposition reactor of diamond have been measured simultaneously by coherent anti-Stokes Raman scattering (CARS). The bright background from the filament was rejected by using CARS and gating on the detector as well as spatial…
<div class="htmlview paragraph">This paper reports on research and development work conducted at AVL to determine the NO<sub>x</sub>-reduction potential of in-cylinder charge conditions, fuel injection system parameters, exhaust gas recirculation, fuel formulation, and exhaust gas aftertreatment by c…
Dynamic-light-scattering experiments on semidilute aqueous solutions of gelatin indicate three relaxation processes: an exponential for times less than \ensuremath{\sim}50 \ensuremath{\mu}sec followed by a power law at intermediate time and then a stretched exponential at long time. The characteristic time of the stre…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTuning the intermolecular dative interactions in vanadium-oxo linear chain compounds: formation of a new type of liquid crystalline polymerAndre Serrette, Patrick J. Carroll, and Timothy M. SwagerCite this: J. Am. Chem. Soc. 1992, 114, 5, 1887–1889Publication Date (Print):Fe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEnergetics of surface reactions on (100) diamond planeDaoyang Huang and Michael FrenklachCite this: J. Phys. Chem. 1992, 96, 4, 1868–1875Publication Date (Print):February 1, 1992Publication History Published online1 May 2002Published inissue 1 February 1992https://pubs.acs.o…