Materials Literature
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David A. Siqueiros Beltrones, Edna Sanchez Castrejon, Structure of Benthic Diatom Assemblages from a Mangrove Environment in a Mexican Subtropical Lagoon, Biotropica, Vol. 31, No. 1 (Mar., 1999), pp. 48-70
Reactions of 2,2′-dipyridylamine (dpyam) with cadmium halides yield crystals of [Cd(dpyam)(H 2 O )Cl 2 ] (1), [Cd(dpyam)Br 2 ] (2), and [Cd(dpyam)I 2 ] (3). With CuCl 2 and KCN a complex [Cu(dpyam )CN] · H 2 O (4) is obtained. Depending on the size of the halide ions the coordination changes from octahedral in 1 to tr…
The rate at which a drug enters the bloodstream is an important characteristic of any drug product because it may have a marked influence on the biological response elicited by the drug. Before entering the bloodstream a solid dosage form (tablet or capsule) must first dissolve and then the drug in solution is absorbe…
Electron energy-loss spectra of (V 1- x Cr x ) 2 O 3 ( x =0.012) at the antiferromagnetic insulating (AFI), paramagnetic metallic (PM) and paramagnetic insulating (PI) phases have been measured using a high-resolution transmission electron energy-loss spectroscopy (EELS) microscope. The changes in the EELS spectra at…
Andisols of the Kitakami mountain range were derived from a mixture of tephras and long range eolian dust deposited during the Quaternary. Thus, the relative proportions of the components of the mixture determined the unique properties of the soils. Soils of the northern and central parts of the mountain range were de…
Two new ferroelectric liquid crystals, 4-[(S)-1-(ethoxycarbonyl)]ethyl 4-[4-(9-decenyloxy)biphenyl]azobenzoate (10) and its ester analogue 4-[(S)-1-(ethoxycarbonyl)]ethyl {[4-(9-decenyloxy)]biphenyl-4'-yl}carbonyloxybenzoate (17), and side chain polysiloxane copolymers and terpolymers containing various amounts of 10…
The steady-state and time-resolved fluorescence and 1H NMR spectra of a stilbenesulphonic acid salt, commonly used as an optical brightening agent, was studied as a function of concentration in aqueous solution. The aggregates, formed at higher concentrations, were shown to be predominantly dimers with the central sti…
A model of a stochastic froth is introduced in which the rate of random coalescence of a pair of bubbles depends on an inverse power law of their sizes. The main question of interest is whether froths with a large number of bubbles can grow in a stable fashion; that is, whether under some time-varying change of scale…
Barium titanate ceramics having grain sizes between 0.5μm and 20μm were used in a comparative investigation of the ferro-para phase transition, by recording the temperature dependencies of the heat capacity and pyrocharge. The experimental results and the theoretical approach suggest that internal stresses are the mai…
X-ray photoelectron diffraction fine structure of Si(100) is studied with precise angle-resolved X-ray photoelectron spectroscopy. Polar-angle intensity distributions of the Si 2p photoelectron emission excited by Al Kα X-rays are measured from H-terminated Si(100) along some azimuthal angles, and are qualitatively in…
The influence of phosphate (P) on the adsorption‐desorption of zinc (Zn) and on Zn fractions was examined for four variable charge soils. The soils were two kaolinitic Alfisols and two Andisols containing high amount of amorphous materials. Zinc adsorption‐desorption isotherms were produced using a batch protocol invo…
Abstract The stabilization effect of alkyltin thioglycolates was determined by the measurement of discoloration of PVC formulations. The results were interpreted considering the structure of these compounds, their equilibration with alkyltin chlorides, and their postulated association with chlorine atoms at PVC primar…
<div class="htmlview paragraph">Carbon canisters have been adapted for automobile use since the early 1970s to control evaporative emissions. Stringent emission regulations and the requirement for an enhanced evaporative emissions test procedure, make this an important issue. The air and evaporative fuel from th…
A new method is used in measuring the linear thermal expansion coefficients in composite consisting of a substrate Gd 3 Ga 2 Ga 3 O 12 (GGG) and its epitaxial layer Y 3 Fe 2 Fe 3 O 12 (YIG) within the temperature range 13.88 °C–32.50 °C. The results show that the thermal expansion coefficient of GGG in composite is la…
The crystal structure of gillulyite Tl 2 (As, Sb) 8 S 13 was reinterpreted based on the average structure determined by Foit et al. (1995). It consists of alternating PbS-like slabs comprised of As-S polyhedra and Tl-bearing slabs with partly zeolitic properties. In the latter, TlS 5 and As 2 S 5 groups alternate regu…
Anatomical compatibility with the thoracic cavity is important in developing a completely implantable total artificial heart (TAH). The purpose of this study was to examine the optimal morphology of our TAH and to develop a computer implantation simulation environment for preoperational discussion. As the first stage,…
The high intensity of concentrated solar radiation obtained with the Odeillo (France) solar furnace facilities can be used to produce carbon nanotubes by direct vaporization of carbon bi-metal targets under inert gas atmosphere. Electron microscope pictures and Raman spectra show that the structure of the produced car…
A method that permits aberration correction and wave-front reshaping with a diffractive optical element (DOE) is described. Two aligned DOE's made of two different dispersive materials are used. The different dispersions of the two materials in addition to freedom in choosing their thicknesses enables the chromatic ab…
Abstract Numerous factors can modify the visibility or the actual dimensions of the skin microrelief and wrinkles. To quantify these changes, several methods, including clinical and non‐invasive ones, have been proposed. This article reviews the advantages et drawbacks of all of them and lists some experimental recomm…
The structural phase transitions and the electrical behaviour of the complex perovskite PbLu1/2Nb1/2O3 have been investigated using X-ray powder diffraction, dielectric constant measurements, differential scanning calorimetry and measurement of the polarisation as a function of applied electric field. The high-tempera…