Materials Literature
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A finite element formulation is presented for the modeling of electromagnetic wave interactions with dielectric structures which are periodic in one dimension in a cartesian coordinate system. The structures are two-dimensional, in the sense that the geometry and material properties remain invariant in one of the othe…
Corrosion inhibitors are widely used in industry, although in many cases their surface chemistry is not well understood. Several nitrogen‐containing organic compounds have been used as corrosion inhibitors. Corrosion inhibition is a surface process which involves the specific adsorption of inhibitors on the metal surf…
From the dependences of electrical conductivity [sgrave]1 and the Hall constant RH( B ‖ C ) of Bi2 Te3-xSx crystals upon the value of x it is found that a transition from hole-like to electron-like conductivity takes place at x × 0.12. The decrease in the hole concentration with increasing x is explained by the idea t…
Framework compositions [Sn5S12]4– have been synthesized hydrothermally in the presence of triethylenediamine (Dabco) and caesium, respectively; the cations are accommodated between the sheets with orientation relationships suggestive of a templating mechanism and their crystal structures have been determined.
The crystal structure of 2-amino-5-nitropyridinium acetophosphonate confirms the possibility to design at request non-centrosymmetric structures based on the 2-amino-5-nitropyridinium polar chromophore. The non-centrosymmetry in this class of materials is mainly dependent on the structure of the associated counter-ani…
Iron and steel slags are often used as subbase materials in the construction of highways. Previous studies have suggested that the free lime (CaO) in these subbases is responsible for the deposition of calcium carbonate (tufa) in many highway drains. Clogging of these drains leads to the deterioration of highways. Pre…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGallium hydrogen selenite diselenite hydrate, Ga(HSeO3)(Se2O5).cntdot.1.07H2O: a novel structure type containing alternating cationic and anionic layersRussell E. Morris and Anthony K. CheethamCite this: Chem. Mater. 1994, 6, 1, 67–69Publication Date (Print):January 1, 1994P…
Stereospecific sequential condensation of paraformaldehyde and propionaldehyde with a tripodal bis(triamine)cobalt(III) template rapidly encapsulates the metal, and a subsequent facile reduction of imine functions gives an expanded cavity hexaazabicyclic cage system with unusual structural and chromophore electron pro…
An analytical expression has been derived for calculating insulation wall thicknesses of single-core polymeric power cables from considerations of discharges in voids. For 10 to 30 kV cables of small conductors (16 to 50 mm/sup 2/), good agreement has been obtained between the thicknesses calculated by the expression…
The objectives of this research were (1) to determine whether the use of partially absorbable vascular grafts would improve their nonthrombogenic performance and whether they are more prone to aneurysmal dilation and subsequent failure in vivo, and (2) to find out the relationships, if any, between these in vivo and t…
Type 304 stainless steel was oxidised at various temperatures in air. The pitting susceptibility of the oxidised and unoxidised specimens was evaluated in ferrie chloride solution. The increased pitting susceptibility of the oxidised specimens at about 500°C is attributed to the change of chemical composition of the o…
In previous studies we showed that a single implant of polylactic-co-glycolic acid (PLGA) polymer as a film containing isoniazid ensured sustained release of the drug for up to 4 weeks. These studies have been extended to PLGA polymer as a rod which is retrievable. Both types of implant gave therapeutically active lev…
The synthesis, conformational analysis, and electronic absorption spectrum of a soluble, conformationally constrained porphyrin dimer linked via a buta-1,3-diyne unit attached to the β-pyrrolic positions is reported.
SiO2-ZrSiO4 powder mixture was prepared from powders of fused silica and zircon with a high-speed stirrer at 2400rpm for 5min. Mixtures were, then, heated at the soaking temperature between 1275°C and 1350°C for different time periods. The fraction of cristobalite precipitated was determined by a quantitative X-ray di…
The influence of the external electric field upon the main line of the ferromagnetic resonance spectrum in the composite ferrite-ferroelectric materials at the basis of yttrium-iron garnet and piezoelectric ceramics of PZT type has been investigated. The phenomenological theory of the magneto-electric effect in the in…
Tremendous efforts have been devoted to the studies of ceramic materials under transient thermal conditions over the past four decades. Such studies are becoming increasingly more important as advanced ceramic materials are demanded for applications at higher temperatures and more severe transient thermal conditions.…
Rapid corrosion influenced by sulfate-reducing bacteria (SRB) of a creviced stainless steel (Fe-15Cr-10Ni) has been produced potentiostatically at -250 mV (SCE) using specially designed media. SRB-influenced corrosion was also produced using a two-compart-ment cell where a small anode was connected through a zero resi…
MgO-C bricks containing 0 to 30 vol% flake graphite and expanded graphite were prepared and heat-treated at 800 and 1400°C. The dependence of mechanical properties of the MgO-C bricks on the graphite content was studied. The maximum values of bending strength, elastic modulus and fracture toughness were obtained at 2…
In Situ Multielement XANES Study of Formation and Reduction of the Oxide Film on Stainless Steel, Davenport, Alison J., Sansone, Michael, Bardwell, Jennifer A., Aldykiewicz, Antonio J., Taube, Michelle, Vitus, Carissima M.
The structural analysis of ground kaolinite and pyrophyllite prepared by dry grinding with the different periods has been made by determining the radial distribution functions from X-ray diffraction data. The SiO4 tetrahedra remain unchanged in either sample of ground kaolinite and pyrophyllite. Whereas, the increment…