Materials Literature
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ω-Vinylpolydimethylsiloxanes (ω-PDMS) and α,ω-divynilpolydimethylsiloxanes (α,ω-PDMS) have been synthesized by anionic polymerization of hexamethylcyclotrisiloxane (D3). The reactions were carried out in n-hexane and tetrahydrofuran (THF), respectively. The initiator was n-butyl-lithium (n-BuLi); tetrahydrofuran was u…
A new procedure of pattern decomposition in energy-dispersive powder diffraction is presented. The total observed pattern is taken as a sum of incoherent and coherent scattering. The incoherent part is calculated from theoretical cross sections for individual atoms, the coherent part is described as a sum of discrete…
The characterisation of platinum group metals catalysts is commonly carried out by temperature-programmed reduction, the spectrum of which has been used as a “finger-print” of the reducibility of the catalyst. Recent literature suggests that the utility of temperature-programmed reduction can be further enhanced by co…
The formation of the oxides of nitrogen, NOx, is examined through experiments and chemical kinetic modeling for lean, premixed combustion in a laboratory, atmospheric pressure, jet-stirred reactor. The experimental conditions are as follows: fuel-air equivalence ratio (φ) of 0.6, temperatures of 1460 to 1730 K, and re…
We have studied the elastic recovery and inverse relaxation phenomena of polyester staple fiber rotor spun yarns. Better fiber orientation obtained with a drawing passage before spinning results in higher permanent deformation and lower delayed elastic recovery of the yarn. Yarn twist has little influence on elastic c…
A method is developed for computing the ion flow from an AC coronating wire above the ground plane, without resort to unnecessary simplifying assumptions. The emission of ions is considered to take place from the wire when the surface field of the wire exceeds the onset value. The space charges are simulated by discre…
Techniques for calculating overheating effects of GIC (geomagnetically induced currents) on large shell-form transformers are described. The techniques include: the method of calculating the exciting current and its harmonic content under DC injection in the transformer neutral; three-dimensional magnetic flux calcula…
We report on the development of a new coating design for applications in the vacuum ultraviolet that yields significantly higher reflectivity over selectable bandwidths. We demonstrate that the concept can be used to fabricate high-performance narrow-band and broadband reflection filters, whose spectral properties can…
Chemicals from various suppliers were tested for the metal contamination levels left on silicon wafers after cleaning. During the investigations, hydrochloric acids and ammonium hydroxides from three vendors and hydrogen peroxides from four vendors, were evaluated. The wafers were cleaned in RCA standard solutions, af…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCobalt-59 NMR of six-coordinate cobalt(III) tetraphenylporphyrin complexes. 4. The effect of phenyl ortho substituents on chemical shift, line width, and structureH. Bang, J. O. Edwards, J. Kim, R. G. Lawler, K. Reynolds, W. J. Ryan, and D. A. SweigartCite this: J. Am. Chem.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRelaxation enhancement of water protons by manganese(III) porphyrins: influence of porphyrin aggregationKenneth E. Kellar and Natalie FosterCite this: Inorg. Chem. 1992, 31, 8, 1353–1359Publication Date (Print):April 1, 1992Publication History Published online1 May 2002Publi…
The freezing behavior and the cluster formation in the liquid and supercooled-liquid state of monodeuterated 2-cyclooctylamino-5-nitropyridine have been studied by deuteron magnetic resonance and relaxation. The results show that the molecular dynamics is both polydispersive and non-Arrhenius-like. The data can be des…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxidative electropolymerization of iron and ruthenium complexes containing aniline-substituted 2,2'-bipyridine ligandsColin P. Horwitz and Qi ZuoCite this: Inorg. Chem. 1992, 31, 9, 1607–1613Publication Date (Print):April 1, 1992Publication History Published online1 May 2002…
Monte Carlo calculations have been performed in order to study the kinetics of carrier trapping in sparsely populated systems. The method of calculation overcomes the problem of a ‘very large number’ of carriers participating simultaneously in the relaxation process. The algorithm of the simulation is described. The c…
Abstract Chemical reaction fouling of heat exchangers involves deposition that is caused by chemical reactions which occur in the fluid, or on the surface itself. The factors which influence fouling of organic fluids via autoxidation and thermal decomposition processes are described and the dependence of the rate of t…
ABSTRACT Isolates of the centric diatom, Thalassiosira weissflogii Grun., were maintained in exponential growth under constant, favorable conditions for nearly 2 years. During this interval, each culture underwent periodic increases and decreases in mean cell size, a behavior predicted for diatom populations alternati…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface free energy characteristics of polyfluorinated silane filmsElek Lindner and Ernest AriasCite this: Langmuir 1992, 8, 4, 1195–1198Publication Date (Print):April 1, 1992Publication History Published online1 May 2002Published inissue 1 April 1992https://pubs.acs.org/doi…
Abstract Fluropolymers, especially polytetrafluoroethylene (PTFE), have good fire‐resistance properties, but their application is limited by concerns over the toxicity of their thermal decomposition products. In experiments using a tube furnace system similar to the DIN 53 436 method, the 30‐minute (+ 14 days observat…
Cristallisation dans Pna2 1 avec a=8.447, b=7.3789, c=5.1408A, Z=4; affinement jusqu'a R=0.0188. D'apres la distribution des charges electroniques, l'orbitale 2p vacante de l'atome B(1) coordine triangulairement est essentiellement occupee par des electrons appartenant a des paires libres des atomes O(1) et O(2) lies…
A comprehensive thermal test program was conducted on a 2000 kVA cast-resin dry type transformer with 300 embedded thermocouples to determine the hottest spot temperature allowance and to obtain data to develop mathematical models. Nineteen thermal test runs were performed at different loads, tap positions, and core e…