Materials Literature
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Abstract The damping function, D.F., as derived from the area under the linear E ″ — temperature curve, expresses the amount of mechanical energy converted to heat per unit volume of material. Sometimes characteristics of the damping behavior of homopolymers and IPN's are more apparent in the linear E ″ —temperature p…
Abstract We have used an optical interference technique to measure the dilation of polystyrene films in the presence of carbon dioxide or helium at pressures up to 20 atm. Dilation isotherms (plots of dilation versus gas pressure at constant temperature) were obtained for three samples of polystyrene which had widely…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal and molecular structure of the charge-transfer salt of decamethylferrocenium and tricyanomethanide, [Fe(C5Me5)2]+/[C(CN)3]-. The electronic structure and spectra of the tricyanomethanide ionDavid A. Dixon, Joseph C. Calabrese, and Joel S. MillerCite this: J. Am. Chem…
The electrochemical potentiokinetic reactivation (EPR) method has recently become a popular test for evaluating the intergranular attack (IGA) of high-nickel alloys and different types of stainless steels (SSs). The EPR method was used in a study on the IGA and intergranular stress corrosion cracking (IGSCC) of a high…
Yttrium hydroxide gel was dried by five techniques to study their influences on the sintering behavior of yttria. Dried precursors, calcined and sintered oxides, and the initial gel were examined via Fourier transform infrared photoacoustic and/or attenuated total reflection spectroscopies. Carbonate was found to be i…
Abstract The residence time distribution of poly(vinyl chloride) (PVC) polymers in a counterrotating twin screw commercial extruder was determined and analyzed. The experimental technique involved the use of manganese dioxide as a tracer after being neutron activated and was injected into the extruder during normal op…
The dehydration, transformation, and densification of boehmite (γ‐AlOOH) are enhanced by addition of γ‐Al 2 O 3 seed particles. α‐Al 2 O 3 microstructures with uniform 1‐ to 2‐μm grain size and sintered densities 98% of theoretical are achieved at 1300°C Thermal analysis shows that γ‐Al 2 O 3 seed particles transform…
The thermodynamic properties of a spin system with two different nearest-neighbor interactions which are ordered in a quasiperiodic pattern along a one-dimensional chain are studied. An exact renormalization technique is used which mimics the deflation rule for a quasiperiodic lattice. The system has a phase transitio…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTheoretical analysis of the bonding in octahedral transition-metal clusters containing .mu.-acceptor and .mu.-donor bridging ligands and their nido and arachno derivativesRoy L. Johnston and D. Michael P. MinggosCite this: Inorg. Chem. 1986, 25, 10, 1661–1671Publication Date…
Abstract The rheological behavior of sulfonated polyisobutylene based elastomeric ionomers has been studied. The effects of molecular architecture, type of cation, and addition of excess neutralization agent were investigated. The effect of temperature was studied to a limited extent. In a specific case, the influence…
In this paper we discuss and illustrate the morphological and ultrastructural features of several Fragilaria and Synedra representatives. These features are often very similar in the two genera, raising once again the question of generic circumscription. New observations are presented for: Fragilaria virescens var. su…
The environment in which graphite is expected to be exposed in high power fusion reactors will impose a dose of ≂50 dpa, temperatures in the range 600–1200 °C, cyclic temperatures, and intense surface interaction with the plasma. A review is presented of the irradiation behavior of various types of graphite under thes…
The objective of this work was to determine the time dependence of the basal component of intracellular degradation of newly synthesized collagen. Chick embryo tendon fibroblasts were incubated with [14C]proline, and degradation was quantified by measuring hydroxy[14C]proline in a low molecular weight fraction. When c…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAnisotropic exchange interactions in the copper(II) and vanadium(IV) dimers [(L')Cu(.mu.-OH)2Cu(L')](ClO4)2 and [(L)VO(.mu.-OH)2VO(L)]Br2 with 1,4,7-triazacyclononane (L) and its N,N',N"-trimethyl derivative (L'): a single-crystal EPR studyA. Ozarowski and D. ReinenCite this…
Abstract Solubility diagrams were developed using log K ° values for MnHPO 4 ·3H 2 O, Mn 3 (PO 4 ) 2 ·3H 2 O, Mn 5 H 2 (PO 4 ) 4 ·4H 2 O and MnPO 4 ·1.5H 2 O. The latter mineral was found to be more stable than hydroxyapatite and thus capable of controlling soil‐solution P at pH values <7.2 and pe + pH values betwe…
The data that were obtained by using a capacitance manometer system to measure the deviation from stoichiometry in nonstoichiometric cerium dioxide as a function of oxygen partial pressure at 800°C were analyzed along with existing data obtained at other temperatures. It was determined that, for values of log less tha…
Abstract Spodosols similar in parent material, relief, and age but different in soil climate and vegetation were studied along two transects in Quebec, Canada. Soils of the northern transect (between 50 and 52°N) were under spruce ( Picea mariana ) forest in a colder region than that of the southern transect (at 46°N)…
Abstract A new PPy composite membrane with PE was prepared by electropolymerization of py in the presence of PE. The PPy/PE film had highly tensile strength, and played a role as ‘charge-controllable membrane’. A novel idea on the immobilized polymer dopant of PPy was presented.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIntrinsic reactivity of magnesium surfaces toward methyl bromideRalph G. Nuzzo and Lawrence H. DuboisCite this: J. Am. Chem. Soc. 1986, 108, 11, 2881–2886Publication Date (Print):May 1, 1986Publication History Published online1 May 2002Published inissue 1 May 1986https://pub…
The influence of molecular properties on the rotational viscosity, γ1, of nematic liquid crystals is studied. The shear viscosity under flow alignment, ηs, is determined for the same liquid crystals. A significant correlation between both quantities is found. An equation is presented which allows the calculation of γ1…