Materials Literature
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The formulation of a general, complete electrical terminal representation of eddy-current loss in transformer windings is presented. It is shown that the effects of mutual resistances must be considered in addition to the familiar winding resistances (self resistances) for a complete description of eddy-current loss.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCatalytic pathways for the electroreduction of oxygen by iron tetrakis(4-N-methylpyridyl)porphyrin or iron tetraphenylporphyrin adsorbed on edge plane pyrolytic graphite electrodesChunnian Shi and Fred C. AnsonCite this: Inorg. Chem. 1990, 29, 21, 4298–4305Publication Date (…
Sulfonic acid ring-substituted polyaniline has been synthesized and characterized by elemental analysis, FTIR, UV-vis and electron spin resonance spectroscopy. Approximately 50% of the total number of phenyl rings in the polymer are mono-substituted by -SO− 3 groups. Without external doping, the ring-sulfonated polyan…
A study of the interactions of single-stranded poly(deoxyadenylic acid) (poly(dA)) with a number of metallo- and nonmetallo-porphyrins is reported. Among the metal derivatives considered is the newly synthesized platinum(II) complex of tetrakis(N-methylpyridinium-4-yl)porphine (PtTMpyP-4). This metalloporphyrin behave…
The potential of Pseudomonas pseudoflava to produce poly-beta-hydroxyalkanoates (PHAs) from pentoses was studied. This organism was able to use a hydrolysate from the hemicellulosic fraction of poplar wood as a carbon and energy source for its growth. However, in batch cultures, growth was inhibited completely at hydr…
Metakaolin is a supplementary cementitious material with pozzolanic properties. Its activation by calcium hydroxide. sulphates and alkali hydroxide is reported. The extent and kinetics of various competing reactions at an early period of hydration were investigated using calorimetry, supplemented by XRD and DTA data.…
The isothermal oxidation of ZrC powders was carried out at relatively low temperatures of 380° to 550°C at oxygen pressures of 1.3, 2.6, and 7.9 kPa under a static total pressure of 39.5 kPa, achieved by mixing with argon, using an electromicrobalance. The oxidation kinetics are described by the diffusion‐controlled J…
Corrosion of 99.999% Al in 1 M NaCl at p H 11 was studied at naturally occurring as well as artificial pits. Electrolytic solution extracted from within natural pits was found to have a p H between 3 and 4. Solution extracted from within artificial pits and complexed with ferron exhibited a UV spectrum that indicated…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSterically protected nickel(II) in a N2S2 donor environment: 1,5-bis(mercaptoethyl)-1,5-diazacyclooctane and its methylated derivativeDaniel K. Mills, Joseph H. Reibenspies, and Marcetta Y. DarensbourgCite this: Inorg. Chem. 1990, 29, 22, 4364–4366Publication Date (Print):Oc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and photoproperties of diamagnetic octabutoxyphthalocyanines with deep red optical absorbanceBoris D. Rihter, Malcolm E. Kenney, William E. Ford, and Michael A. J. RodgersCite this: J. Am. Chem. Soc. 1990, 112, 22, 8064–8070Publication Date (Print):October 1, 1990P…
Results are summarized of a comprehensive study of the effects on the SCR process of all major possible poisons encountered in the combustion gases from U.S. coals. A general rule evolved from this study Is that the effect of the additive on the catalyst activity Is directly related to the basicity of the additive; po…
The correlation between the structure and zero-temperature energy of symmetrical tilt grain boundaries (STGBs) in b.c.c. metals is investigated using a many-body potential of the Finnis-Sinclair type for Mo and Johnson's pair potential spline-fitted for α-Fe. As in free surfaces, the misorientation phase space associa…
A Monte Carlo model for simulating final‐stage sintering has been developed. This model incorporates realistic microstructural features (grains and pores), variable surface difusivity, grain‐boundary diffusivity, and grain‐boundary mobility. A preliminary study of a periodic array of pores has shown that the simulatio…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular topology exchange interaction: synthesis and magnetic properties of [Cu(II)3M(II)] (M = cadmium, nickel, manganese) tetranuclear speciesFrancesc Lloret, Yves Journaux, and Miguel JulveCite this: Inorg. Chem. 1990, 29, 20, 3967–3972Publication Date (Print):October 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA thermodynamic interpretation of polymer molecular weight effect on the phase transitions of main-chain and side-chain liquid-crystal polymersVirgil Percec and Andrew KellerCite this: Macromolecules 1990, 23, 20, 4347–4350Publication Date (Print):October 1, 1990Publication…
A series of sodium aluminosilicate glasses composed of varying ratios ( R ) of Al 2 O 3 /Na 2 O (0.25 R 2.0) has been simulated with the molecular dynamics technique using a tetrahedral form of a three‐body interaction potential. Extrema in the activation energies for sodium diffusion and in the diffusion constants fo…
Polarization characteristics were studied in nickel and yttria stabilized zirconia cermet (Ni‐YSZ cermet) electrodes in order to search for an adequate fabrication condition of a planar solid oxide fuel cell. Several electrodes were prepared by the slurry coating method, and dc and ac polarization behaviors were inves…
Water-Formed and Steam-Formed Deposits. Long-Term Overheating. Short-Term Overheating. Caustic Corrosion. Chelate Corrosion. Low pH Corrosion During Service. Low pH Corrosion During Acid Cleaning. Oxygen Corrosion. Fire-Side Corrosion. Oil Ash Corrosion. Coal Ash Corrosion. Waterfall Corrosion. Cold End Corrosion. Dew…
Electrochemical characterization has been carried out for two types of phenolic resin‐based activated carbon‐fiber cloths (ACFC)—ACFC(a) and (b)—as polarizable electrodes. The specific surface areas of ACFC(a) and ACFC(b) were 1630 and 1060 m 2 g −1 , respectively. The differential capacitance of ACFC(a) in organic el…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTControl of surface functionality in the synthesis of dendritic macromolecules using the convergent-growth approachCraig J. Hawker and J. M. J. FrechetCite this: Macromolecules 1990, 23, 21, 4726–4729Publication Date (Print):October 1, 1990Publication History Published online…