Materials Literature
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Abstract Chitin was obtained from shell of the tail portions of the prawn Nephrops norvegicus (L) and was deacetylated to give chitosan. The adsorption and diffusion of copper (II) ions were studied and the diffusion of the acid dye CI Acid Orange 10 through chitosan films containing different amounts of chelated copp…
Kinetic studies on the decomposition of a flexible polyurethane foam based on tolylene diisocyanate and a polyether polyol of propylene oxide have been carried out with the thermogravi-metric technique (TGA). In dry nitrogen the decomposition proceeds in two overall steps. At the end of the first step, which follows a…
Embrittlement of Zircaloy-4 cladding by oxidation of the inner surface occurring in an LWR loss-of-coolant accident was studied using simulated fuel containing of A12O3 pellets sheathed in Zircaloy-4 specimen cladding, filled with Ar gas, and sealed. This simulated fuel rod was heated from outside until the isothermal…
Abstract A survey of the Raman and infra red data for the layered structure InSe shows that there is no agreement upon its crystallographic structure. The polytypes, β, ε, and γ are equally invoked by the various groups. Some experiments on samples from different laboratories are repeated. Infrared transmission at dif…
Experimental and theoretical studies have been made of losses in Nb/Ti multifilamentary composite exposed to transverse alternating and rotating fields. Analytical expressions for eddy current losses inside the copper matrix can be found. As for hysteresis losses, an analytical expression can only be obtained in low a…
A method for describing cubic giant cells is proposed. The structures may be regarded as arrangements of nested polyhedra units, isolated or linked, centred at sites of high point symmetry. Five basic types of nested polyhedra units, taken from well known cubic structures are defined: α-Mn (29 atoms), BCC (27), γ-bras…
ABSTRACT RELATIVELY little research has been reported in the literature on the thin-layer drying characteristics of soybeans in comparison to that published on corn and other cereal grains. Lee (1959) investigated the thin-layer drying of rewetted soybeans and fitted his data to a diffu-sion-type drying model. He empl…
The interaction of the [UMo12O42]8– anion with Th4+ results in the formation of an infinite chain complex [Th(H2O)3UMo12O42]4n–n, in which the Th atom has tricapped trigonal-prismatic geometry.
The results of development work on a novel particle metallurgy processing technique for highly alloyed tool and high-speed steel manufacture carried out at Aurora Steels Ltd are described. The technique, which employs metal splatting to achieve rapid rates of solidification, overcomes many of the problems and addition…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA structural study of tris(.beta.-diketonate)europium(III) complexes in solution using magnetic circularly polarized luminescence spectroscopyFrederick S. Richardson and Harry G. BrittainCite this: J. Am. Chem. Soc. 1981, 103, 1, 18–24Publication Date (Print):January 1, 1981…
A mass-spectrometric analysis of photodesorption from V2O5 power and oxidized vanadium surfaces shows that carbon dioxide is the only desorbing species under UV irradiation. The threshold wavelength for this process for V2O5 powder is about 520 nm, which corresponds to a photon energy of 2.35 eV. The experimental data…
The difference between literature values of ultrasonic attenuation and absorption coefficients, defined as the scatter coefficient, was related to percent wet weight collagen concentration for brain, heart, liver, kidney, and tendon, in the range of 0.7 to 7 MHz. The comparison shows that as the ultrasonic frequency i…
An appropriate form of the preferred orientation correction has been derived for the powder pattern-fitting based on data of the powder diffractometry with a flat specimen holder. The seven powder specimens with different average particle sizes were prepared by grinding the synthetic crystals of taeniolite, KLiMg2Si4O…
A Raman spectral study has been carried out on the structure of the glassy and molten states of the binary silicates, Li2O-SiO2, Na2O-SiO2, K2O-SiO2, CaO-SiO2, SrO-SiO2 and BaO-SiO2.An argon-ion laser beam of 4880 Å has been used as an exciting light for the glassy state and 4579 Å for the molten state. New discrete R…
A synthesis of the octaethylbilindione (1) from 3,4-diethylpyrrole is described which is suitable for the preparation of this valuable model compound in quantity.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConvenient preparation and isolation of pure potassium cyclopentadienyldicarbonylferrate, K[(.eta.5-C5H5)Fe(CO)2]Jeffrey S. Plotkin and Sheldon G. ShoreCite this: Inorg. Chem. 1981, 20, 1, 284–285Publication Date (Print):January 1, 1981Publication History Published online1 M…
Vinyl chloride-based homo- and copolymers are universal polymer products lying at the base of a tower of materials and products They enjoy wide use in practically all spheres of human activities.
Both weight loss and electrochemical measurements have been made to study the effects of chromate inhibitor on the erosion-corrosion of carbon steel specimens in a 5 cm diameter slurry pipeline carrying a 20 Vol% aqueous slurry of silica sand (size range 0.3 to 0.6 mm) over a velocity range 2-3.5 m/s. In the absence o…
The polarized single-crystal spectra of GdAl3(BO3)4 containing 3 % Eu3+ have been measured, with particular reference to the absolute ƒ–ƒ absorption intensities, and the crystal structure of the host lattice has been determined from single-crystal X-ray data with a refinement by least-squares methods to R= 0.058. The…
Crystal forms and crystal structure of the metastable polyhydrate (weddellite) and the stable monohydrate (whewellite) occurring in plant cells are described and their formation as well as their physiological bearing are discussed.