Materials Literature
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Abstract Polymer blends of PEEK with PES were prepared by the solution blending method. Copolymers composed of PEEK and PES components were synthesized from these oligomers. The formation conditions exerted an influence over the molecular aggregation and the crystallization behaviors of the blend films and block copol…
Three experiments were carried out using the rhizobox system to determine the distribution of heavy metals (Cu, Zn, Mn, and Fe) across the rhizosphere of barley (Hordeum vulgare L., var. Dorirumugi). The movement of 65Zn, 54Mn, and 59Fe within the rhizosphere was also investigated. The solubility of heavy metals was e…
The possible mechanisms of particle aggregation and reduction in liquid limit of the Cochin marine clay on drying are investigated. Mineralogical analysis showed the absence of halloysite in the marine specimen. Experimental results also ruled out the possibility of cementitious material being responsible for particle…
We have measured the temperature-dependent electrical conductivity of ${\mathrm{Cu}}_{2}$O at pressures up to 500 kbar and of CuO up to 700 kbar. The high-pressure phase of ${\mathrm{Cu}}_{2}$O has a resistive thermal activation energy of a few meV and localization behavior below 7 K. No phase transitions were observe…
GeAsSeTe, GeSeTeTl, and GeSeTe glass fibers with a core-cladding structure were prepared by one of two methods: crucible drawing or preform drawing. The diameter of the core was 340 microm and that of the cladding was 440 microm. The transmission loss spectra of the fibers were measured by the cut-back method. The cru…
Abstract Hornblende of the Carrol Knob mafic complex (southern Blue Ridge Mountains, North Carolina) has weathered under humid, temperate conditions. Hornblende weathering appears to have been a dissolution-reprecipitation reaction, in which hornblende dissolved stoichiometrically, and the ferruginous and aluminous we…
N. J. Anderson, A Whole-Basin Diatom Accumulation Rate for a Small Eutrophic Lake in Northern Ireland and its Palaeoecological Implications, Journal of Ecology, Vol. 77, No. 4 (Dec., 1989), pp. 926-946
Delaminations are a principal quality problem in the manufacture of multilayer ceramic capacitors (MLC's). They are defined as a separation of the electrode and dielectric layers and can result in electrical shorts and/or life failures. Delaminations originate from many sources in MLC manufacture, but we have identifi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoinduced destabilization of bilayer vesiclesDavid A. Frankel, Henry Lamparski, Ulrich Liman, and David F. O'BrienCite this: J. Am. Chem. Soc. 1989, 111, 26, 9262–9263Publication Date (Print):December 1, 1989Publication History Published online1 May 2002Published inissue…
Abstract The thermal oxidation of polyamide 6 and 6,6 gives rise to azomethine groups (Schiff's bases) as a result of the reaction of aldehyde and ketocarbonyl groups with amino end groups. During the course of degradation, these azomethine groups react with each other in an aldol‐type condensation to produce conjugat…
Abstract The nomenclature of CaZrTi 2 O 7 minerals has become very confused, such that zirconolite, zirkelite and polymignite each have acquired multiple meanings and represent five different crystal structures. To resolve these inconsistencies, the IMA approved resolutions as follows. Zirconolite is the non- crystall…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFormation of metal-chalcogen bonds by the reaction of metal-alkyls with silyl chalcogenidesS. M. Stuczynski, J. G. Brennan, and M. L. SteigerwaldCite this: Inorg. Chem. 1989, 28, 25, 4431–4432Publication Date (Print):December 1, 1989Publication History Published online1 May…
A general chemisorption model is proposed that yields a rate expression consistent with the quantitative structure-activity relationship (OSAR) developed by Hansch. Even complex inhibition mechanisms may be amenable to this treatment. For example, t-cinnamaldehyde (TCA) and many of its derivatives undergo slow polymer…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVariable-density model of polymer melt surfaces: structure and surface tensionDoros N. TheodorouCite this: Macromolecules 1989, 22, 12, 4578–4589Publication Date (Print):December 1, 1989Publication History Published online1 May 2002Published inissue 1 December 1989https://pu…
Our main objective is to identify a boundary-value problem capable of describing the dynamics of fluids having moving contact lines. A number of models have been developed over the past decade and a half for describing the dynamics of just such fluid systems. We begin by discussing the deficiencies of the methods used…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGlycoconjugated tetrapyrrolic macrocyclesPhilippe Maillard, Serge Gaspard, Jean Luc Guerquin-Kern, and Michel MomenteauCite this: J. Am. Chem. Soc. 1989, 111, 25, 9125–9127Publication Date (Print):December 1, 1989Publication History Published online1 May 2002Published inissu…
Abstract Strictly reproducible syntheses of the trimorphs of composition Cu 2 Cl(OH) 3 , atacamite, paratacamite, and botallackite, have been developed. In syntheses involving direct precipitation, or reaction of aqueous solutions with solid phases, reliable results are obtained only if the temperature and time of rea…
Different results are obtained when DNA in aqueous solution and DNA in biological tissue are exposed to ultrasound. At intensities of ultrasound comparable to those applied clinically, ultrasonication is able to degrade purified DNA in aqueous solution, making ultrasonication a useful tool for preparing DNA fragments…
The diffusion-controlled relaxation model, originally proposed by Glarum for molecular liquids, is applied here to ionic transport in glasses. For the first time, the detailed frequency-dependent behaviour predicted by this model, when an exact treatment of the diffusion due to Bordewijk is employed, is discussed. It…
Following a major shortage of 99Mo in the 2009–2010 period, concern grew that the aging reactor production facilities needed to be replaced. Most producers were using highly enriched 235U (HEU) as the target material. The Organisation for Economic Co-...Read More