Materials Literature
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Phase development as a function of hot‐pressing temperature was studied in alkoxide‐derived titanate‐based ceramics doped with a 10 wt% loading of a sodium‐rich (NAR) and a sodiumpoor (NAP) simulated high‐level waste. Pyrochlore was found to be the most abundant phase in both calcine powders. A pseudobrookite phase ex…
Abstract Samples of Narmco Rigidite 5208/WC3000 carbon‐epoxy prepreg were exposed to ambient temperature (22°C) and 50% relative humidity for different periods up to 66 days. They were analyzed in depth using various techniques to determine the extent of the chemical changes occurring. The physicochemical techniques u…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolid-state chemistry of molecular metal oxide clusters. Reactions of microporous dihydridobis(triphenylphosphine)iridium-tungsten complex [(Ph3P)2IrH2]3PW12O40 with small organic moleculesA. R. Siedle and R. A. NewmarkCite this: Organometallics 1989, 8, 6, 1442–1450Publicat…
Cristallisation dans P6 3 /mmc avec affinement jusqu'a 0,044. La structure consiste en une alternance de couches de structure spinelle ou de structure perovskite
Abstract The fundamental aspects of PVC degradation and stabilization are discussed. The primary process of thermal degradation (initiation, zip‐elimination of HCl and simultaneous formation of polyene sequences, and termination of unzipping) is reevaluated in the light of results obtained with PVCs containing increas…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemical kinetics and reaction mechanism of thermal decomposition of aluminum hydroxide and magnesium hydroxide at high temperature (973-1123 K)Ienwhei Chen, Shuh Kwei Hwang, and Shyan ChenCite this: Ind. Eng. Chem. Res. 1989, 28, 6, 738–742Publication Date (Print):June 1, 1…
The absolute efficiency of Gd 2 O 2 S:Tb screens under fluoroscopic conditions was studied and found to vary between 0.5 and 9.0*10 -5 W m -2 mR -1 s depending on the X-ray tube voltage and on the screen's weight. Theoretical calculations based on the uniform screen model gave results in close agreement with experimen…
We have conducted wearer trials demonstrating that human subjects can perceive the heat of sorption of water vapor by wool garments in typical winter conditions. We found that this heat of sorption causes wearers to rate wool garments as warmer under certain conditions than materials with little or no heat of sorption…
Abstract This paper reviews research since 1980 on the equilibria and kinetics of transport of small organic molecules in rigid and plasticized PVC. The forms of both the solubility isotherms and the sorption kinetics are shown to change as the PVC/penetrant system undergoes a glass‐rubber transition with an increase…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSome reactions and properties of molecular diatomic carbon C2. An experimental and theoretical treatmentPhilip S. Skell, Lloyd M. Jackman, Sheikh Ahmed, Michael L. McKee, and Philip B. ShevlinCite this: J. Am. Chem. Soc. 1989, 111, 12, 4422–4429Publication Date (Print):June…
Mammalian and Escherichia coli succinate dehydrogenase (SDH) and E. coli fumarate reductase apparently contain an essential cysteine residue at the active site, as shown by substrate-protectable inactivation with thiol-specific reagents. Bacillus subtilis SDH was found to be resistant to this type of reagent and conta…
Previously published observations on chromosome numbers for 43 diatom taxa are reviewed. Members of five centric families, as well as araphid, monoraphid and biraphid pennate species are included in the list. Greatest range in diploid complement is found in the biraphid group, where the smallest (8) and largest (130)…
To assess the utility of skin wipes as an index of exposure to polycyclic aromatic hydrocarbons (PAHs), simultaneous skin wipe and breathing zone air samples were obtained for 10 roofers. Samples were obtained during removal of an old coal-tar pitch roof and application of a new asphalt roof. Skin wipes were obtained…
Abstract Isothermal enthalpy relaxation in polystyrene was measured as a function of temperature and molecular weight on a differential scanning calorimeter. Relaxation spectra were derived from the data and expressed as a distribution of relaxation times. For a given molecular weight the relaxation spectra at differe…
Copper(I) oxide films were prepared on copper substrates by exposing them to solutions containing Cu 2+ ions, and it was observed that the photoresponse of these films electrodes in a photoelectrochemical cell is both n- and p-type. However, it was observed that the n-type behaviour of these film electrodes could be e…
SUMMARY A model which describes the reaction of anions and cations with soil when they are added separately was applied to the results of Roy et al. (1986a,b ) in which pair‐wise combinations of phosphate, arsenate, and molybdate competed for sorption on three soils. The model postulates that the reaction is between i…
Abstract The thermal degradation of three aliphatic polythiocarbonates was investigated by direct pyrolysis in the ion source of a mass spectrometer operating both in electron and chemical ionization modes. The overall evidence indicates that these polymers start decomposing at about 250–280°C by an end‐biting process…
Comparisons of experimental optical and acoustical bubble size spectra disagree in size distribution at the low end of the spectrum. Previous methods of obtaining acoustic bubble size information relied strictly on resonant acoustical scattering and absorption theory. For some plausible distributions, these traditiona…
The concept of using engineering principles as an aid in designing textile fabrics with desirable aesthetic characteristics is further developed. Fundamental to this ap proach is the measurement of fabric mechanical and surface properties, e.g., fabric tensile, shear, bending, surface, and lateral compression properti…
New polyesters prepared by the intefacial polycondensation of 2,6-bis(4- hydroxybenzylidene ) cyclohexanone (I) and 2,6-bis(4-hydroxy-3-methoxybenzylidene)- cyclohexanone (II) with 4,4'-diphenic, isophthalolyl, terephthaloyl, adipoyl and sebacoyl dichlorides have been produced. The yield and the values of reduced visc…