Materials Literature
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We present an analytical formulation that shows the negative refraction of propagating waves and the growth of evanescent waves within a negative refractive index (NRI) lens made of a periodically L, C loaded transmission-line (TL) network, referred to as the dual-TL structure. A transformation known as the "array sca…
Silica-supported silver nanocomposites were synthesized by rf sputtering of Ag from Ar plasmas. Depositions were performed on amorphous silica substrates at temperatures as low as 60 °C. As a general rule, a careful choice of the synthesis conditions allowed the obtainment of Ag/SiO2 nanosystems with well-tailored che…
Methods of suppressing decreased conductivity in 8 mol% Y 2 O 3 ‐stabilized–92 mol% ZrO 2 (8YSZ) with aging were investigated. Different amounts of Sc 2 O 3 were doped into 8YSZ. The electrochemical properties of Sc 2 O 3 ‐doped 8YSZ were measured, and the microstructural and local structural changes were characterize…
Airdecking is used in mining for two quite different applications. One is to enhance the fragmentation by amplifying the induced fracturing and the second is for pre-split blasting in which the borehole fracturing is reduced. This paper deals with the first of these effects. A forth coming paper will describe pre-spli…
geology, crystal structure, sulfosalts, complex sulfides
The thermal conductivity of polycrystalline Al‐doped ZnO was controlled through the fabrication of nanostructured polycrystalline materials, by hot‐pressing nanosized Zn 1– x Al x O ( x = 0.01, 0.02) particles, which were synthesized by a coprecipitation and spray‐drying method. This process resulted in an improved th…
Metal and metal-oxide based nanosystems are intriguing candidates for a plethora of advanced applications thanks to their diversified chemico-physical properties, that can be further tailored by the use of proper synthesis procedures. Among the different preparation techniques, chemical vapor deposition (CVD), rf sput…
α(6 H )‐ and β(3 C )‐SiC powders were sintered with the addition of AlB 2 and carbon. α‐SiC powder could be densified to ∼98% of the theoretical density over a wide range of temperatures from 1900° to 2150°C and with the additives of 0.67–2.7 mass% of AlB 2 and 2.0 mass% of carbon. Sintering of the β‐SiC powder requir…
This paper reports the development of a new particle model to simulate fabric mechan ical behavior. A particle model of square meshes, which is close to the orthotropic structure of a woven fabric, is used to represent the fabric. In addition to the separation, bending, and shearing springs, a twist spring is introduc…
The sonochemical degradation of phenol, 2-chlorophenol and 3,4-dichlorophenol in aqueous solutions as a function of several operating conditions has been investigated. Experiments were performed at initial substrate concentrations of 0.1, 0.5 and 1 g l(-1), liquid phase volumes of 0.05, 0.07 and 0.08 l, electric power…
Twenty-three of 86 strains of lactic acid bacteria transformed linoleic acid into hydroxy FA. Two distinct conversion pathways were in operation. Two strains of Lactobacillus acidophilus and a strain of Pediococcus pentosaceus produced 13(S)-hydroxy-9-octadecenoic acid 113(S)-OH 18:11 and 10,13dihydroxyoctadecanoic ac…
Article Quantum Chemical Parameters of Some Organic Corrosion Inhibitors, Pyridine, 2-Picoline 4-Picoline and 2,4-Lutidine, Adsorption at Aluminum Surface in Hydrocholoric and Nitric Acids and Comparison Between Two Acidic Media. was published on December 1, 2003 in the journal Main Group Metal Chemistry (volume 26, i…
A pH-responsive polymer Eudragit S-100 has been found to assist in correct folding of alpha-chymotrypsin denatured with 8 M urea and 100 mM dithiothreitol at pH 8.2. The complete activity could be regained within 10 min during refolding. Both native and refolded enzymes showed emission of intrinsic fluorescence with l…
Abstract The Şile Region contains discontinuous, cyclic, thin coal beds and industrial clay deposits that were accumulated in lacustrine basins which received extensive volcanoclastic sediments due to transport of highly weathered calc-alkaline volcanic rocks. The Sülüklü area has the largest kaolin deposit in this re…
Magnesium - 8.5 wt-% lithium and AZ91 alloys, processed using rotary die equal channel angular pressing, exhibit superplasticity. Deformed specimens have been used to investigate the movement of alloying elements during superplastic deformation. Optical microscopy and electron probe microanalysis were used for the inv…
Sodium montmorillonite clay consists of platelets, one nanometer thick with large lateral dimensions, which can be used to achieve efficient reinforcement of polymer matrices. Formation of these nanocomposites requires modifying the clay with an appropriate organic surface treatment and optimized processing. Some of t…
Abstract Hot dipping of steel in aluminium–zinc baths of varying composition (5–90% Al) has been undertaken with the aim of elucidating the mechanism of coating formation. On the basis of these experiments, it has been possible to define a range of aluminium content over which there is a change from a normal galvanizi…
Abstract This paper is in four parts. The first is related to general considerations and experimental analyses, and each of the others is related to different approaches to the theoretical analyses of the mechanical behaviour of weft-knitted fabrics and weft-knitted reinforced composites made of glass fibre. The objec…
Nous avons affine la structure cristalline de l'uzonite provenant de la localite type, la caldeira de Uzon, au Kamchatka, en Russie, dans le groupe spatial P2 1 /m jusqu'a un residu R de 2.66%. Les parametres reticulaires sont: a 7.973(2), b 8.096(2), c 7.148(2) A, β 101.01(2)°, V 452.9(2) A 3 , Z = 2. Le modele struc…
Nanomaterials and, in particular, nanoparticles are at the forefront of the nanotechnology wave.Over recent years there has been a rapid increase in the range of available nanomaterials and the number of companies that supply them.A variety of production techniques is used, each with benefits and drawbacks, but these…