Materials Literature
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Eggs fertility rate and some biological aspects of the immature forms were studied on six Simulium species from ovipositions collected in natural breeding places located in rural area. The fertility was considerably high. For a total of 213 ovipositions containing 74,906 eggs, the average fertility rate was 99.13% wit…
[Pb(Mg 1/3 Nb 2/3 )O 3 ] 0.69 (PbTiO 3 ) 0.31 single crystal of composition close to the morphotropic phase boundary has been studied by dielectric spectroscopy in the frequency range of 1–1000 kHz under hydrostatic pressure (p) up to 0.6 GPa. At ambient pressure two successive phase transitions have been observed: th…
Rotation invariance imposes nonlinearities in the elastic strain of smectic liquid crystals. Though often neglected, in smectic liquid crystals these nonlinearities can generate new qualitative behavior, especially in the presence of defects such as dislocations. By exploiting geometry, I describe exact results on edg…
The orientation of crystals of the giant magnetostrictive compound Terfenol-D solidified in a static magnetic field has been investigated. When the melt with size ϕ16×18mm2 solidifies slowly in a static magnetic field of 140mT, texture of the samples appears and the easy magnetization axis of the polycrystal tends to…
Tissue engineering of skeletal muscle in vitro or in vivo holds promise for the treatment of skeletal muscle defects and might once provide an alternative to host muscle transfer.Skeletal muscle tissue engineering is based on the regenerative properties of the satellite cells or myoblasts and their potential for proli…
A three-component Mannich-type reaction catalyzed by the Lewis acid-core metallodendrimers prepared from the dendritic 2,2′-bipyridine ligands and Cu(OTf)2 proceeded smoothly in water. A positive dendritic effect on the chemical yields of the Mannich products was observed.
The multiple-state storage capability of phase change memory (PCM) is confirmed by using stacked chalcogenide films as the storage medium. The current–voltage characteristics and the resistance–current characteristics of the PCM clearly indicate that four states can be stored in this stacked film structure. Qualitativ…
We have performed magnetic susceptibility and low and high field magnetization measurements on single crystals of the Ni tetramer compound [Ni 4 (μ-CO 3 ) 2 (aetpy) 8 ] (ClO 4 ) 4 (aetpy = 2-aminoethyl-pyridine) with a butterfly (diamond) structure. We observed a two-step-like magnetization curve and a further increas…
Future Army gun systems will require lighter weight and significantly more erosion-resistant materials. One route to achieve this goal is via the development of ceramic matrix composite barrel liners with lightweight metal matrix composite jackets. Such materials systems are hybrids of a ceramic matrix composite/metal…
The printing of photographs in pure gold, rather than the ubiquitous medium of silver, was first achieved in 1842 by Sir John Herschel, but his innovative ‘chrysotype’ process was soon consigned to obscurity, owing to its expense and uncertain chemistry. In the 1980s some modern coordination chemistry of gold was appl…
Novel B 3 CN 3 fibres with a special structure have been synthesized by a pyrolysis process. High-resolution TEM analysis shows that the as-prepared B 3 CN 3 fibres can be described as a nanofibre-interweaved network. Strong photoluminescence at 370 nm and 700 nm from the as-prepared B 3 CN 3 fibres are observed at ro…
Fatigue behaviour of Pb(Zr 0.45 Ti 0.55 )O 3 (PZT) thin films on Pt (111) /Ti/SiO 2 /Si (100) substrates with PbZrO 3 (PZ) buffer layers were investigated. Two different buffer layer configurations were studied: bottom- and top-only buffer layers. The PZ buffer layers were obtained by RF magnetron sputtering of a loos…
In order to study the applicability of EMAR (electromagnetic acoustic resonance) method to non-destructive hydrogen level assessment in fuel spacer bands at pool side, an ultrasonic transmitter and receiver together with an EMAT (electromagnetic transducer) were used. Unirradiated Zircaloy-2 thin plates were hydrogen…
Dielectric permittivity of PMN and PMN with 10% PT single crystals was measured in the frequency range from 20 Hz to 3 GHz. Dielectric dispersion was observed in all investigated frequency range. From the frequency dependence of the real and imaginary parts of dielectric permittvity, the distribution of relaxation tim…
Purpose Proposes to investigate preparation of amorphous silica via precipitation reaction from aqueous solution of sodium metasilicate and hydrochloric acid in emulsion medium, focusing on determination to optimise the dispersive and morphological properties of silicas studied. Design/methodology/approach The silicas…
Zirconium alloy sheets were prepared with varying Fe, Cr and Ni systematically. The corrosion and hydrogen pickup property were estimated in steam at 673 K, in water at 633 K and in super critical water at 673 K. The effect of the SPP and the oxide film on the hydrogen pick-up was studied from the hydrogen pick-up rou…
Cross-linked urethane/urea membranes with two soft segments were prepared by extending a poly(propylene oxide) based tri-isocyanate-terminated prepolymer (PUR) with polybutadiene diol (PBDO). The ratio of prepolymer and polybutadiene diol was varied to yield cross-linked membranes with different compositions, exhibiti…
A study of the microdynamics of supercooled liquids and glasses is executed through calculations of the dynamic structure factor S(k, θ). The theory developed on the basis of a self-consistent approach in the framework of the memory function formalism is applied to define the frequency spectra (m/k B T)S(k, θ) of supe…
Brazil has played an important role in the development and use of resonance Raman spectroscopy as a powerful characterization tool for materials science. Here we present a short history of Raman scattering research in Brazil, highlighting the important contributions to the field coming from Brazilian researchers in th…
An analysis of the microstructure of nanocrystalline magnesium oxide produced by thermal decomposition of magnesium oxalate, in the temperature range 500 °C–1200 °C, is described. The study is based on diffraction line broadening analysis carried out with the integral breadth (Langford) and Fourier methods, combined w…