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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…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConvergent functional groups. 2. Structure and selectivity in olefin epoxidation with peracidsJ. Rebek Jr., L. Marshall, J. McManis, and R. WolakCite this: J. Org. Chem. 1986, 51, 10, 1649–1653Publication Date (Print):May 1, 1986Publication History Published online1 May 2002…
Structures of the thermotropic mesophases of lead(II) decanoate are reassigned following optical and X-ray diffraction studies. These results, and those of D.S.C., Raman and 207Pb N.M.R. spectroscopy, indicate formation of a lower temperature mesophase involving mainly increased lateral disorder, and a higher temperat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMacrocyclic complexes of indium(III): novel .mu.-hydroxo- and .mu.-oxo-bridged complexes. Crystal structures of [L4In4(.mu.-OH)6](S2O6)3.4H2O and [L2In2(CH3CO2)4(.mu.-O)].2NaClO4 (L = 1,4,7-triazacyclononane)Karl Wieghardt, Michael Kleine-Boymann, Bernhard Nuber, and Johanne…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation W. A. Swansiger; Summary Abstract: Tritium solubility in high purity beryllium. Journal of Vacuum…
Abstract Petrocalcic horizons occur in a number of soils formed from Cretaceous limestone in central and west Texas (Edwards Plateau land resource area). Microfabric and stable C isotope analyses confirmed that the indurated carbonate zones are mostly of pedogenic origin. Multiple lines of evidence indicate that the p…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanical properties of substituted polyacetylenesToshio Masuda, Ben Zhong Tang, Akira Tanaka, and Toshinobu HigashimuraCite this: Macromolecules 1986, 19, 5, 1459–1464Publication Date (Print):May 1, 1986Publication History Published online1 May 2002Published inissue 1 May…
The pyrolytic decomposition of tetraethylorthosilicate (TEOS) has been used to deposit highly doped borophosphosilicate glass (BPSG) films. The experiments were carried out in a modified low pressure chemical vapor deposition furnace in the 620–680 °C range at a deposition pressure of 0.5 Torr. Trimethylborate and pho…
The needle-shaped frustules of the diatoms Thalassionema Grunow and Thalassiothrix Cleve et Grunow are furnished with uniquely structured areolae which appear as a row of depressions along each edge of the valve. In Thalassionema the areolae open freely outwards and are surmounted by one to three simple silica branche…
The interference of scalar optical Floquet-Bloch waves in periodically stratified media is discussed in detail. Two main types of interference are identified and fully analyzed: normal and exchange interference, producing, respectively, real and virtual spatial fringes. In the paper considerable use is made of a recip…