Materials Literature
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Anionic copolymerization of elemental sulfur (S8) with cyclic monosulfides (thiiranes) is shortly reviewed. More recent work on homopolymerization of cyclic trisulfides (1,2,3-trithiolanes) and their copolymerization with S8 is discussed in more detail. Anionic homopolymerization of cyclic trisulfides is a living, hig…
The ARIES-I reactor is a 1000-MWe, DT-burning tokamak reactor that combines present-day physics with advanced engineering technology such as high-field superconducting magnets and low-activation SiC composites as structural material. Recent developments in the manufacturing of fiber-reinforced ceramics for improved me…
Dielectric and X-ray diffraction measurements were used to characterize the structural phase transition occurring in antiferroelectric Pb(Yb 1/2 Nb 1/2 )O 3 compound. Dielectric behavior for ceramics shows a sharp transition with a large temperature hysteresis of about 6°C near transition temperature. The lattice para…
Real time spectroscopic ellipsometry from 1.5 to 4.0 eV has been applied to monitor surfaces of optical quality diamond thin films during exposure to low energy Ar and H ion beams, and atomic H. Monolayer-level sensitivity to the conversion of diamond to optically absorbing sp2 bonded carbon upon ion impact is demonst…
Das konformativ flexible „molekulare Rohrstück”︁ 1 a läßt sich durch Cyclisierung entsprechender [3.3]Phane nach dem Verdünnungsprinzip herstellen. Die Bildung des Isomers 1 b mit gekreuzter Anordnung der Phan‐Einheiten kann aufgrund NMR‐spektroskopischer Befunde und mechanistischer Überlegungen ausgeschlossen werden.…
Abstract The intrinsic birefringence of rigid poly(vinyl chloride), PVC, was obtained from measurement of birefringence and infrared dichroism. Rigid PVC samples were stretched at temperatures above the glass‐transition temperature, T g , to various stretch ratios. The measured intrinsic birefringence obtained in this…
Asexual yeast flocculation was studied using strong flocculents of Saccharomyces cerevisiae. The inhibitory effect of cations on flocculation is considered to be caused by competition between those cations and Ca2+ at the binding site of the Ca(2+)-requiring protein that is involved in flocculation. Inhibition of floc…
By means of a decomposition-decimation method based on the renormalization-group technique, we have studied the spectral properties of two-dimensional Fibonacci quasilattices. It is found that the spectrum of two-dimensional Fibonacci quasilattices has a variety of multifurcating structures. The analytic results show…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpathodol, a New Polyhydroxysterol from the Leaves of Spathodea campanulataSilvere Ngouela, Etienne Tsamo, Beibam L. Sondengam, and Joseph D. ConnollyCite this: J. Nat. Prod. 1991, 54, 3, 873–876Publication Date (Print):May 1, 1991Publication History Published online1 July 2…
= 11,123) and (b) to evaluate the impact of adjusting MRWT scores for the effect of skinfold thickness on the classification of scores using percentile ranks and criterion referenced standards (CRS). MRWT was significantly related to the sum of subscapular and triceps skinfolds in all age-gender groups. In 12-year-old…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudies of the stability of poly(ethylene oxide) and PEO-based solid electrolytes using thermogravimetry-mass spectrometryG. K. Jones, A. R. McGhie, and G. C. FarringtonCite this: Macromolecules 1991, 24, 11, 3285–3290Publication Date (Print):May 1, 1991Publication History P…
The development and the continued success of switch-mode power supplies have created an expanding commercial market. This market is continually challenging the ferrite industry to produce high-quality ferrite cores capable of operating at increasingly higher frequencies. The advantage of the switch-mode power supply i…
We report preliminary results of scanning electron microscopy (SEM) imaging with submicron resolution at atmospheric pressure using silicon nitride windows to separate the atmosphere from the electron optics. The edge response of the current system is 0.25 μm through 75 nm windows at 15 μm air path length. We discuss…
Abstract Gorring (1973) reported a phenomenon, the “window effect,” whereby the diffusivities of normal paraffins within zeolite T do not decrease monotonically with increasing carbon number N, as would be expected intuitively. Rather, following an initial decrease with N, the diffusivities exhibit a local minimum at…
Communication: Discotic mesogens with C 3 symmetry (see figure) are shown to form the basis of a chemically stable low‐temperature model for the carbonaceous mesophase, a key intermediate in the production of coke and graphite via the carbonization of organic precursors. The synthesis and properties are reported. magn…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of silicate ratio on the distribution of silicate and aluminosilicate anions in TPA aluminosilicate solutionsR. F. Mortlock, A. T. Bell, A. K. Chakraborty, and C. J. RadkeCite this: J. Phys. Chem. 1991, 95, 11, 4501–4506Publication Date (Print):May 1, 1991Publication…
Recent genetic mapping of the aspartokinase II (lysC) operon of Bacillus subtilis [M. Petricek. L. Rutberg & L. Hederstedt (1989) FEMS Microbiology Letters 61, 85-88; N.Y. Chen. J. J. Zhang & H. Paulus (1989) Journal of General Microbiology 135, 2931-2940] has shown its chromosomal location to be close to the aecA loc…
Magnetron sputtering was used to deposit a thin film of lanthanum hexaboride for cathode structures. The chemistry of the coatings was studied with x-ray diffraction, Auger electron spectroscopy, and x-ray photoelectron spectroscopy. The work function and electron emission characteristics of the coating have been stud…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTransition-metal borides with the tantalum boride (Ta3B4) crystal structure: their electronic and bonding propertiesR. M. Minyaev and Roald HoffmannCite this: Chem. Mater. 1991, 3, 3, 547–557Publication Date (Print):May 1, 1991Publication History Published online1 May 2002Pu…
Abstract Oxygen plasma treatments of transparent polymers such as polystyrene (PS) and polycarbonate (PC) were performed. Then the hydrophobic recovery of treated surfaces and its effect on their misting behavior was studied. Surface investigations, such as XPS and water contact angle measurements, were combined with…