Materials Literature
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Ammonium pentaborate (APB) is shown to be an effective intumescent, char- forming additive for thermoplastic polyurethanes (TPU). As little as 5 to 10 parts of APB, added to a flame retarded TPU, provides a 7 to 10-fold improve ment in burn-through resistance. The APB/TPU char is characterized by its glassy, multicell…
The ionic conductivities in glass and glass‐ceramics were studied for Na 3.2 M 0.7 Si 2.9 P 0.1 O 8.7 ( M = Er , Y , Ho , Dy , Gd , Eu , and Sm ) compounds. The results showed comparable conductivity values, in the range of 10 −4 (Ω‐cm) −1 at 280°C, with the glasses being somewhat better conductors. Compounds of the t…
Abstract The composition and/or temperature dependence of the dynamic Young's modulus for the ordered B2 Co-Al, Fe-Al, and Ni-Al aluminides has been investigated using the piezoelectric ultrasonic composite oscillator technique (PUCOT). The modulus has been measured in the composition interval 48.49 to 52.28 atomic %…
Turnip-yellow-mosaic virus, with its stable, highly spherical and monodisperse character, was chosen as a suitable model substance with which to test hydrodynamic theories of transport. Sedimentation coefficients, diffusion coefficients (obtained through photon correlation spectroscopy) and viscosities were measured a…
Abstract In phase behaviour calculations and compositional simulations with an equation of state, it is advantageous to represent the oil and gas systems by a small number of pseudo-components. This paper presents a scheme for determining these pseudocomponents based on the K-values of all constituents that are presen…
The traditional bulk elastic modulus approach to plant cell pressure-volume relations is inconsistent with its definition. The relationship between the bulk modulus and Young's modulus that forms the basis of their usual application to cell pressure-volume properties is demonstrated to be physically meaningless. The b…
Emission spectra of the A<SUP>2</SUP>Π-X<SUP>2</SUP>Σ<SUP>+</SUP> system of MgH have been studied at high resolution and with high signal-to-noise ratio through the use of a Fourier transform spectrometer. On the basis of a rotational analysis of these data, frequencies are predicted for the lowest pure rotational tra…
We describe the preparation of the six configurationally distinct cyclobutane-type photodimers generated by the acetone-sensitized uv irradiation of thymidine in aqueous solution. Also prepared as minor photoproducts are the 5R and 5S di-astereoisomers of 5,6-dihydrothymidine, and two novel molecules, the 5R and 5S di…
Abstract Starting with 2,3,9,10,16,17,23,24‐phthalocyanineoctacarbonitrile ( 3a ) different octa‐substituted phthalocyanines 4a – 7a and 3b – 7b with carboxylic acid, anhydride, imido and amido groups were prepared. IR and UV/VIS spectra are discussed in detail and compared with unsubstituted phthalocyanine ( 1 ). 3 –…
This review describes the current status of methods for characterizing the crosslink structure in network polymers. It is not intended to be an exhaustive summary of the literature itself, but rather a critical survey of key papers in the field. It is hoped that this information will provide researchers with an up-to-…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTC-Hydroxy- and C-methylchlorins. A convenient route to heme d and bonellin model compoundsC. K. Chang and Chariklia SotiriouCite this: J. Org. Chem. 1985, 50, 24, 4989–4991Publication Date (Print):November 1, 1985Publication History Published online1 May 2002Published inissu…
The Strehl ratio, in the form of McCutchen's theorem, is employed to design a spatial filter that increases the depth of focus. Computer-simulated images show the increment in focal depth.
A detailed investigation of the decomposition of formaldehyde was carried out to account for the fact that formaldehyde decomposition on Group VIII metals, e.g. , palladium, occurs without simultaneous hydrogen generation, while on Group I B metals, e.g. , copper, formaldehyde decomposition is accompanied by hydrogen…
A water-equivalent plastic material RW-1, in the form of thin foils as well as of thicker sheets, has been produced by melting powdered polyethylene together with CaCO3 and MgO. The mixture has been developed in a three-step procedure, starting with provisional mixtures and using data from their measured attenuation c…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn XPS investigation of titanium dioxide thin films on polycrystalline platinumC. M. Greenlief, J. M. White, C. S. Ko, and R. J. GorteCite this: J. Phys. Chem. 1985, 89, 23, 5025–5028Publication Date (Print):November 1, 1985Publication History Published online1 May 2002Publi…
In this paper the translatory motion of a compound drop is examined in detail for low-Reynolds-number flow. The compound drop, consisting of a liquid drop or a gas bubble completely coated by another liquid, moves in a third immiscible fluid. An exact solution for the flow field is found in the limit of small capillar…
The initial rate of hydrolysis of six commercially available native (type l) celluloses was determined for the crude cellulase complexes of the thermophilic anaerobic bacterium C. thermocellum and the mesophilic fungus T. reesei. These rates were then compared with certain physical features of the substrates in an att…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic exchange interactions in binuclear transition-metal complexes of a binucleating clathrochelate ligandMark D. Timken, William A. Marritt, David N. Hendrickson, Robert A. Gagne, and Ekk SinnCite this: Inorg. Chem. 1985, 24, 24, 4202–4208Publication Date (Print):Novemb…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHighly efficient sodium hypochlorite olefin epoxidations catalyzed by imidazole or pyridine "tailed" manganese porphyrins under two-phase conditions. Influence of pH and of the anchored ligandFernando Montanari, Michele Penso, Silvio Quici, and Patrizia ViganoCite this: J. O…
A phenomenological theory of the magnetic and magnetoelectric properties of boracites is developed, using the Landau-Dzialoshinskii approach. An interpretation is proposed for the main distinctive features characterizing eleven members of this family of compounds, namely the symmetry changes, the magnetic and magnetoe…