Materials Literature
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We have measured the density of liquid sulfur as a function of temperature near the polymerization temperature. We measure between 424 and 445 K, with a precision in density of 2×10−5 and an accuracy of 5×10−4. We see upward shifts of the density within 3 K of the polymerization temperature of about 8×10−4 with each c…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and physical properties of poly(aryl ether phthalazine)sRina Singh and Allan S. HayCite this: Macromolecules 1992, 25, 3, 1025–1032Publication Date (Print):February 1, 1992Publication History Published online1 May 2002Published inissue 1 February 1992https://pubs.a…
<div class="htmlview paragraph">The magnesium alloy AE42 (nominally a 4 % aluminum, 2 % rare earth alloy of magnesium) is a developmental die cast alloy with good strength and creep resistance at elevated temperatures. Standard salt spray corrosion tests have been used with controlled purity AE42 die castings to…
Specimens of both natural (Monte Somma) and synthetic Na-rich nepheline have been used to synthsize two ion-exchange series, ranging in composition to pure kalsilite. Excess Si in the natural and synthetic series was 5.2 and 1.7 mol% respectively. The associated vacancies in the alkali sites were found to play an impo…
Neovascularization plays a major role in prosthetic vascular graft healing. New developments in manufacturing biomaterials have encouraged the use of biological and biosynthetic materials for both arterial replacement and bypass procedures. We have analyzed in vivo the process of neovascularization and incorporation o…
The structure of the intermetallic compound A13Zr has been studied at 293 K by single-crystal X-ray diffraction (Mo Ka radiation, ,~ -- 0.71069 A), powder neutron diffraction {A[Ge(711)] = 1.0867 A} and convergent-beam electron diffraction (CBED) (200 keV, A = 0.0251/k). The structure of AI3Zr comprises four close-pac…
Abstract Terra rossa samples were taken from the B horizons of soil profiles and from cracks within limestone in Italy. The average annual temperature (AAT) of the sites ranged from 8.4 to 20.3°C and the average annual precipitation (AAP) from 511 to 3113 mm, with either a 5–6 month water deficit or a large water surp…
The synthesis and luminescence characteristics of Eu 2+ activated calcium magnesium chlorosilicate, Ca 8 Mg ( SiO 4 ) 4 Cl 2 , have been reported and analyzed. The emission spectrum of Eu 2+ is composed of two separate bands with peaks at 507 and 428 nm, which result from the Eu 2+ centers in different crystallographi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSonochemistry: some factors that determine the ability of a liquid to cavitate in an ultrasonic fieldArnim Henglein, Daniel Herburger, and Maritza GutierrezCite this: J. Phys. Chem. 1992, 96, 3, 1126–1130Publication Date (Print):February 1, 1992Publication History Published…
Excited state absorption (ESA) spectra were measured for the 4I11/2? 4F7/2 transition at 980 nm in Er-doped fluoride and fluorophosphate glass, by varying the pump wavelength from a tunable Ti:sapphire laser and monitoring the relative strength of the green upconverted fluorescence. The ESA cross section spectra are t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and characterization of a novel organopolysilane. (3,3,3-Trifluoropropyl)methylpolysilaneMasaie Fujino, Tomoko Hisaki, Michiya Fujiki, and Nobuo MatsumotoCite this: Macromolecules 1992, 25, 3, 1079–1083Publication Date (Print):February 1, 1992Publication History…
On the basis of new radiobiological findings, the ICRP has recently revised the LET dependence of the quality factor Q(LET) for charged particles. In consequence, many in phantom defined radiation protection quantities have to be re-evaluated. Among these, the most important operational quantity in radiation protectio…
Synchrotron-radiation single-crystal x-ray diffraction is used to study the modulations corresponding to both the ${\mathbf{q}}^{1\mathrm{\ensuremath{-}}}$and ${\mathbf{q}}^{2}$-type charge-density waves (CDW's) in ${\mathrm{NbSe}}_{3}$. The ${\mathbf{q}}^{1}$-type modulation is shown to involve displacements of the a…
The crystal structure of a calcium binding equine lysozyme has been determined at 2.5 A resolution by means of molecular replacement. The energy minimized equine lysozyme as the starting model, was refined with the molecular dynamics program, X-PLOR, and the R factor of the current model was found to be 24% without an…
Abstract A remote nitrogen plasma has been used for the rapid attachment of nitrogen to linear low density polyethylene, nylon 6,6, poly(ethylene vinyl alcohol), and poly(ethylene terephthalate). Analysis was performed using X‐ray photoelectron spectroscopy to investigate the chemistry occurring on the surface. Nitrog…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, structure, and properties of a [manganese] complex that consists of an {Mn2O2(O2CCH3)}2+ core and a spanning hexadentate ligandSamudranil Pal, Joel W. Gohdes, Wolf Christian A. Wilisch, and William H. ArmstrongCite this: Inorg. Chem. 1992, 31, 4, 713–716Publicatio…
The electrical conductivity of high‐purity single‐crystal alumina is determined in a temperature range from 400° to 1300°C. By applying an advanced fully guarded threeterminal measurement technique, reliable conductivity measurements are performed to as low as 10 −17 Ω −1 · cm −1 . Gas and surface conduction are measu…
We investigate the current status of the mode-coupling theory (MCT) of the glass transition by making a comparison with two recent sets of experiments: the scaling data resulting from the dielectric measurements of Dixon et et al. et al. [Phys. Rev. Lett. 65, 1108 (1990)] and the neutron-scattering data. Our main conc…
In recent years, we have been reporting our research on composite yarns of mostly cotton content produced on a modified ring spinning system. Recently, we reported an improved method of producing an all staple-core spun yarn, and we have applied the same method to filament-core spinning, obtaining a yarn of greatly im…
Abstract Some aspects of batch cooling crystallization in the industrial practice are analysed by computer simulations. The results indicate that without appropriate kinetics and very accurate process control, even the qualitative effects of applying controlled cooling and seeding are highly unpredictable. An increase…