Materials Literature
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The electrical and optical properties of rf-sputtered Sn-doped In2O3 (ITO) films have been found to depend strongly on the O2 partial pressure during deposition. For the sputtering conditions used, films with both low electrical resistivity (ρ ∼ 3 × 10−4 Ω cm) and high visible transmission (∼ 90%) were obtained only o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBiodegradable Films from Starch and Ethylene-Acrylic Acid CopolymerFelix H. Otey, Richard P. Westhoff, and Charles R. RussellCite this: Ind. Eng. Chem. Prod. Res. Dev. 1977, 16, 4, 305–308Publication Date (Print):December 1, 1977Publication History Published online1 May 2002…
Chemical, optical and infrared absorption, Mössbauer and X-ray data are reported for eight cordierite samples. Fe^(2+) in the octahedral and channel sites is identified in optical and Mössbauer spectra, which indicate that generally less than 5 percent of the total iron is Fe^(2+) in the channels. The single-crystal M…
A short description is given of the determination–as a function of frequency and temperature–of secondary mechanical loss peaks in glassy amorphous polymers. The molecular motions causing secondary loss peaks are classified. The dependence on frequency of the temperature of the maximum of the loss peak is discussed. T…
J. D. Goss-Custard, The Ecology of the Wash. III. Density-Related Behaviour and the Possible Effects of a Loss of Feeding Grounds on Wading Birds (Charadrii), Journal of Applied Ecology, Vol. 14, No. 3 (Dec., 1977), pp. 721-739
The incommensurate (I) states of the triple charge density waves (CDW) in 1T-TaS 2 are studied in details by taking into account a sufficiently large number of harmonics. A domain-like structure of the I-CDW state is shown to be realized as the fundamental wave vector of the I state approaches to the commensurate (“3×…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA numerical model of chemical kinetics of combustion in a turbulent flow reactorC. K. Westbrook, J. Creighton, C. Lund, and F. L. DryerCite this: J. Phys. Chem. 1977, 81, 25, 2542–2554Publication Date (Print):December 1, 1977Publication History Published online1 May 2002Publ…
Abstract Increased insight into the mechanism of carbocationic copolymerization has been achieved by classifying and reviewing in detail 334 monomer pairs in terms of the extended Kelen‐Tüdös method. The reactivity ratios ( r values) of essentially all published olefin–olefin, olefin–vinyl ether, vinyl ether‐vinyl eth…
Abstract Interaction between a collapsing bubble and a free surface is investigated theoretically and experimentally using high speed photography. A limit value for the distance from the free surface to the center of the bubble reported to its radius is found. Under this limit the free surface is not disturbed before…
Abstract The densities of two allophane samples measured by displacement with water were 2·72–2·78 g/cm 3 , while those measured by a float-sink test in CH 3 OH-, CH 3 COCH 3 -, C 6 H 6 - and CCl 4 -C 2 H 2 Br 4 mixtures were 1·84, 1·94–1·98, 2·35 and 2·35–2·39 g/cm 3 , respectively. The results of the density determi…
A high level of stability is essential for any biological standard and is desirable in most other biological products. It is in general impossible to observe directly the rate of degradation of a biological standard since no independent scale of measurement is available. An indirect method is therefore required. The m…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and properties of LixVS2 (0 .ltoreq. x .ltoreq. 1)D. W. Murphy, C. Cros, F. J. Di Salvo, and J. V. WaszczakCite this: Inorg. Chem. 1977, 16, 12, 3027–3031Publication Date (Print):December 1, 1977Publication History Published online1 May 2002Published inissue 1 De…
J Wong and C A Angell New York: Marcel Dekker 1976 pp xv + 864 price SwF 145 The need for an extensive review of this subject was clearly demonstrated by the difficulty in keeping this book on my desk and not on my colleagues'. Studies of the generally recognised spectroscopic techniques applied to inorganic glasses a…
Abstract The supramolecular organization of the aromatic polyamide fiber Kevlar 49 has been studied using a combination of electron diffraction and electron microscope dark‐field image techniques. The dark‐field images derived using selected reflections from longitudinal sections exhibit axial banding of two main type…
En un artículo anterior (1) se dio cuenta de los trabajos realizados sobre la influencia que ejerce el CO2 puro en las características químicas, físicas y fisicomecánicas de un cemento portland (P-450), fabricado por la industria española, habiendo probado que tanto el cemento anhidro, como el hidratado, experimentan…
Se estudia la composición del agua de amasado (a/c = 0,5) de un cemento comercial, obteniendo que a los 10 minutos del comienzo se trata de una solución muy concentrada de KOH y NaOH con algo de CaOH, SO4Ca, Al, Fe y vestigios de Si. La composición del agua de amasado a la 24 horas es similar. Evaporando estas solucio…
Con objeto de demostrar que el hormigón confeccionado con cemento PA-350 no presenta ninguna anomalía (si se pone en obra y se siguen las reglas elementales de cualquier código de buena práctica y que especifican todas las Normas referentes al hormigón, las cuales se dan para cumplir en todos los hormigones, independi…
El acero embebido en el hormigón se encuentra sometido a un medio de elevada alcalinidad (pH comprendido entre 12 y 13), debido a la cal libre, a los álcalis que contiene el cemento, y al Ca(0H)2 que se forma durante la hidratación de los silicatos. En esta situación, el acero se halla recubierto por una capa de óxido…
El trabajo apunta la importancia que reviste el enfriador de clínker en el tema del ahorro de energía. Para un mejor conocimiento del funcionamiento de aquél se ha puesto a punto un modelo que permite predecir el efecto de cambios en la velocidad de parrilla, caudal de aire de enfriamiento, recirculación de gases cali…