Materials Literature
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Abstract A transient mathematical model has been developed which describes the behavior of packed‐bed catalytic converters during warmup. Model predictions agree very well with the results of engine‐dynamometer experiments for three Pt‐alumina catalysts of widely different properties, thus demonstrating the validity o…
The transient temperature field (as seen by a moving observer) due to a moving heat source, such as the process zone near a dynamically propagating crack tip or an external agent as in the case of welding, is analyzed by a moving-mesh finite element procedure. The effects of the temperature-dependent material properti…
Of several methanogenic bacteria examined only Methanococcus voltae readily incorporated exogenous amino acids into cell protein. This was easily shown, since growth in the presence of exogenous amino acids resulted in a loss of signal intensities from those carbon atoms normally labelled by [13C]acetate during biosyn…
Atomic charges are derived from two dissimilar methods of partitioning the electron density of diatomic molecules. The results given by both methods are similar, with the exception of those for molecules containing lithium; factors responsible for this discrepancy are explored. The charges derived are correlated close…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation, structures, and physical properties of two products from the iodination of (phthalocyaninato)iron(II)Sharon M. Palmer, Judith L. Stanton, Narendra K. Jaggi, Brian M. Hoffman, James A. Ibers, and Lyle H. SchwartzCite this: Inorg. Chem. 1985, 24, 13, 2040–2046Publ…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA test of superconductivity vs. molecular disorder in (BEDT-TTF)2X synthetic metals: synthesis, structure (298, 120 K), and microwave/ESR conductivity of (BEDT-TTF)2I2BrThomas J. Emge, Hau H. Wang, Mark A. Beno, Peter C. W. Leung, Millicent A. Firestone, Harvey C. Jenkins, J…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFormation of an iron(IV)-oxo "picket-fence" porphyrin derivative via reduction of the ferrous dioxygen adduct and reaction with carbon dioxideM. Schappacher, R. Weiss, R. Montiel-Montoya, A. Trautwein, and A. TabardCite this: J. Am. Chem. Soc. 1985, 107, 12, 3736–3738Publica…
Abstract Pelitic rocks in North Wales, ranging in age from late Precambrian to Silurian were sampled. XRD analysis was used to determine the mineralogy and white mica crystallinity of separated < 2 µm fractions. Results show that three stages of metapelite recrystallization can be distinguished. Stage I metapelites…
Abstract An experimental study was conducted to investigate the rheological behavior of a heterogeneous polymer blend system consisting of nylon 6 and an ethylene‐based multifunctional polymer (CXA 3101, DuPont Co.). For comparison purposes, we also investigated the rheological behavior of two additional blend systems…
An assessment has been made of the current interest and potential future of zirconia ceramics for structural applications. Interest in the mechanical properties of ceramics based on, or containing, ZrO2 centres on the manipulation of the tetragonal to monoclinic martensitic phase transformation. It will be demonstrate…
Abstract Transmission and analytical electron microscopy have been used to study the diagenesis of the trioctahedral component of phyllosilicates (principally chlorite) in argillaceous core samples (depths of 1750, 2450, and 5500 m) from the Gulf Coast. Chlorite was observed as 100-150-Å thick packets intergrown withi…
Changing environmental conditions to which intermediate moisture foods (IMF's) are exposed during production, storage, distribution and use, are important microbial stability factors. Temperature changes result in local surface condensations leading to microbial outgrowth on the surface. An approach to improved surfac…
A series of technical data for preparing PbTiO3 ferroelectric thin films and their applications to some electronic devices have been presented. PbTiO3 thin films having considerably good ferroelectric properties have been obtained by rf sputtering or CVD. Maximum dielectric constant and remanent polarization are about…
Electron-induced conductivity measurements were performed on polyethylene terephthalate to compare electron and hole contributions to the radiation-induced conductivity. The electron mobility in this material was found to be ≳102 times that of the holes. This result explains an earlier observation that the radiation-i…
A Pb(Fe, Nb)O 3 −Pb(Fe, W)O 3 −Pb(Zn, Nb)O 3 dielectric ceramic fires at temperatures low enough for 100% silver electrodes to be used in multilayer capacitors made with the ceramic. Good dense Pb(Fe, Nb)O 3 , ceramics were obtained by fast, firing, i.e. by using rapid ramp rates and very short firing times. The densi…
Circular dichroism spectra in the ultraviolet region, similar to the spectrum of the collagen helix, were regenerated when various grades of industrial gelatin were allowed to stand at 5°C in a concentration low enough that they did not form gels. Spectrum generation was decreased by an addition of salt or alcohol and…
Abstract Das thermostabile Polyphenylchinoxalin (PCO) haftet nur ungenügend auf Cupfer. Eine Behandlung der Cupferoberfläche im nichtthermischen Plasma einer Hochfrequenz‐Glimmentladung führte zu erheblichen Verbesserungen der Haftfestigkeit. Als besonders geeignet erwiesen sich die vorsichtige Plasmaoxidation der Cup…
Abstract Poly(phenylene ether)s (PPE) are a class of polymers which contain phenolic monomers attached via an ether linkage. Depending upon the monomer types used in the polymerization, a variety of homopolymers and copolymers can be produced. When compounded with polystyrene, these poly(phenylene ether)s combine to f…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolarization effects upon adsorptive and catalytic properties. 2. Surface electrical conductivity of nickel(II) oxide deposited on lithium niobate (LiNbO3) and its changes upon gas adsorptionYasunobu Inoue, Kazunori Sato, and Shinichi SuzukiCite this: J. Phys. Chem. 1985, 89…
Abstract The Differential Scanning Calorimeter (DSC) was used to discriminate among 25 commercial high density polyethylenes (HDPE) on the basis of their degree of crystallinity and melting temperature. The area under the melting endotherm correlated directly with density and inversely with creep and thermal expansion…