Materials Literature
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This paper presents the structural, electrical, and optical properties of F- and (Sb+F)-doped tin oxide films prepared by spray pyrolysis technique. Resistivity as low as 5.5×10−4 Ω cm with high optical transmission (≳80%) and high infrared reflection (∼90%) have been obtained in F-doped tin oxide films. The figure of…
Abstract A description is given of an analytical temperature‐rising elution fractionation (TREF) system for the purpose of determining short‐chain branching (SCB) or copolymer distributions in poly‐ethylenes and ethylene copolymers. The system achieves fractionation on the basis of crystallizability and is shown to be…
The effect of added Al, as an acceptor impurity, on the equilibrium electrical conductivity of large‐grained, polycrystalline BaTiO 3 , is consistent with a previously proposed defect model which involves only doubly ionized oxygen vacancies, electrons, holes, and acceptor impurities. The behavior is an extension of t…
The space group and atom configuration of monoclinic Na2Ti9O19 have been studied by combining 1 MeV high-resolution electron microscope imaging with the convergent-beam electron diffraction (CBED) technique. The crystal has monoclinic symmetry with lattice parameters a = 12.2, b= 3.78, c = 15.6 Å and β= 105°. The spac…
Analyzed is a systematic fault, in the carrying out of tests, which permits the establishment of the possible causes which originate the alteration of stones in artistic monuments. As a result, a collection of methods is proposed, adopted by the ASTM standards and recommended by the RILEM, which permit the functioning…
The petrographic parameters and the physical properties controlling the alteration of the monumental stones of the Cathedral of Oviedo (Spain) are analized in this first paper. A special emphasis is placed on the characterization of the porosity, on account of the role this plays in the development of the forms and ph…
This paper deals with the behaviour during about one year, of cast-iron and galvanized cast-iron tubes used for water pipes in building instalations, either as such or previously wrapped up in newspaper —according to some local practices—, from the viewpoint of their corrosion in contact with cement mortars and concre…
With reference to some comments recently made by the well known and informed author A. VIRELLA BLODA in a wide and detailed report on the Congress referred to, published in the Technical Review CEMENTO-HORMIGON, concerning the Round Table of Theme IV: POZZOLANAS AND FLY-ASHES and particularly to a paper presented unde…
In this work, the first of another new series, a study is made on the influence brought by adding different quantities of a groundgranulate slag to a high initial resistance industrial portland cement (cement 1 < > P-550-ARI) in its chemical-strength behaviour against the action of a gypsum saturated solution, determi…
Evans (1971) has reported that voids produced by irradiation could form into three-dimensional arrays. Since then void lattices have been observed in a number of metals, for example, Mo, W, Nb, Ta, Al and Ni. In all these metals the pattern of ordering shows many similarities. A number of theories have been proposed t…
The classical Rayleigh-Plesset equation of spherical bubble dynamics in an incompressible liquid is generalized to include the non-Newtonian behavior of the liquid and mass exchange processes at the bubble interface.
A detailed kinetic study of corrosion reactions of iron In HCl, H2SO4, and H3PO4 is made by a modified version of the gasometric technique. Reaction rates are measured at different temperatures. Curves drawn for reaction rates led to the development of a new kinetic expression, viz, rate = A eBC e−E/RT, where C is the…
The microstructural features of isothermally aged and step aged and isothermally aged Sm(Co, Cu ,Fe, Zr)7.4 alloys are examined using electron microscopy and x-ray microanalysis. The microstructure is seen to consist of a cellular morphology with twinned rhombohedral 2:17 phase cell interiors, 1:5 phase cell boundarie…
ABSTRACT Chitin (poly‐β (1⇒4)‐N‐acetyl‐D‐glucosamine), chitosan (deacetylated chitin) and microcrystalline chitin (redispersible chitin powder) were compared with microcrystalline cellulose to examine the use of those cellulose‐like biopolymers as functional additives for potential application in food formulations. Wa…
ADVERTISEMENT RETURN TO ISSUEPREVArticleCoordination Compounds of Porphyrins and PhthalocyaninesKevin SmithCite this: Organometallics 1982, 1, 3, 570Publication Date (Print):March 1, 1982Publication History Published online7 January 2004Published inissue 1 March 1982https://pubs.acs.org/doi/10.1021/om00063a904https://…
The corrosion of the pure metals aluminium, cobalt, copper, chromium, molybdenum, nickel, and titanium and of a cobalt-chromium molybdenum casting alloy has been studied in buffered saline with and without the presence of the proteins serum albumin and fibrinogen. The corrosion of aluminium and titanium was unaffected…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTransients of monolithic catalytic converters. Response to step changes in feedstream temperature as related to controlling automobile emissionsSe H. Oh and James C. CavendishCite this: Ind. Eng. Chem. Prod. Res. Dev. 1982, 21, 1, 29–37Publication Date (Print):March 1, 1982P…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOn the rotation-inversion controversy on photoisomerization of azobenzenes. Experimental proof of inversionHermann Rau and Erik LueddeckeCite this: J. Am. Chem. Soc. 1982, 104, 6, 1616–1620Publication Date (Print):March 1, 1982Publication History Published online1 May 2002Pu…