Materials Literature
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Abstract: The acoustic pressure waves associated with partial discharges in HV power transformers can be detected with external piezoelectric sensors. The propagation time and the waveshape of the received signals are affected by factors such as the sensor position, internal barriers and sensor type. These are investi…
Water trees result from ac electrical aging of the polymeric insulation of medium and HV power cables in a humid or wet environment. As suggested by their name, they arise from penetration of water in the polymer. Visual observation with the help of an optical microscope shows tree (bush) type structures. This suggest…
Piezocone soundings were performed in residual silts and fine sands of the U.S. Atlantic Piedmont geologic province to investigate penetration pore-water pressures and subsequent dissipation characteristics in these “nontextbook” geomaterials. Piedmont residuum has been formed by the in-place weathering of Paleozoic s…
Resistance degradation of Pb(Mg1/3Nb2/3)O3–Pb(Zn1/3Nb2/3)O3–PbTiO3 (PMZNT) relaxor ferroelectrics during nickel electroplating was investigated by resistivity measurement and X-ray photoelectron spectroscopy (XPS) through the appearance of changes in Nb 3d and Pb 4f spectra. It was found that the insulation resistance…
Benzyltrimethylammonium hydroxide is found to be a very efficient catalyst for nitroaldol condensation in a short time with excellent yield.
Activated carbon material has been used for many years in air cleaning applications. Powder form activated carbon has been gradually replaced by activate carbon fibre, which allows much smaller pores - specific area of such material may reach up to 2000 m2/g. An experimental dynamic volatile organic compound (VOC) gen…
The dynamic performance of large area, high-resolution flat panel displays is contingent upon the conductivity of the transparent electrode. Electroplated copper and vacuum deposited aluminum bus bars attached to the sidewalls of conventional SnO2 electrodes offer theoretical improvements in conductivity while maintai…
Grain refinement of cast magnesium alloys containing Al is attained by adding carbon materials. This technique is well established. However, it is important problem that C2Cl6 as grain refiner generates dioxin matters. Therefore, it is impossible to use grain refiners containing chloride. This study was performed to d…
(S)-Oxybutynin HCl (S-OXY) is a white crystalline solid powder with an acicular particle morphology. Differential scanning calorimetry (DSC) thermograms revealed one characteristic endotherm at 116.2 degrees C. On rescanning a sample heated to 120 degrees C, no thermal events were distinguished in the temperature rang…
A theoretical study of lithium intercalation into the transition metal oxide cathode material, V6O13, is presented. A combination of classical and quantum mechanical computational simulation techniques are used to predict the stable sites occupied by inserted lithium ions, changes to the unit cell dimensions as lithiu…
Eight cation radical salts of tetrathiotetracene (TTT) with a series of 2-alkoxytetracyanoallyl anions (RO-TCA−; R = Me, Et, Prn, Bun) were prepared by electrocrystallisation. All of them were non-magnetic semiconductors. Seven crystal structures were determined. The physical and structural aspects of the salts were w…
Acrylic acid and HCl-doped polyanilines were synthesized by chemical oxidative polymerization. The synthesized materials were used as sensors for ammonia. Comparison of the responses of the two polymers reveal that the acrylic acid-doped polymer exhibits higher sensitivity and reversibility. Further, the resistance is…
In this short communication we describe the synthesis and the optical and magnetic properties of optically active three dimensional (3D) bimetallic [Cr-Mn] networks [[Delta Cr(III) Delta Mn(II)(ox)(3)][Delta Ru(II)(bpy)(3)]ClO(4)](n)1 - Delta, [[Lambda Cr(III)Lambda Mn(II)(ox)(3)][Lambda Ru(II) (bpy)(3)]ClO(4)](n) 1 -…
Influences of the formation behavior of the R phase on the hardness and the impact toughness were experimentally studied for high nitrogen duplex stainless steels containing 25 mass% of Cr, 7 mass% of Ni, 3 to 5 mass% of Mo, 0.14 to 0.27 mass% of N, and 0.02 mass% of C. The steels were solution heat treated at 1 323 K…
Microporous membranes of high-density polyethylene were prepared by melt-extrusion followed by annealing and uniaxial extension. Crystallization at a high melt flow rate and subsequent annealing of the spun films with fixed ends led to the formation of oriented hard-elastic materials with a high modulus of elasticity…
The transverse and longitudinal effective thermal conductivity and contact conductance of discontinuous and misoriented graphite fiber-reinforced composites has been studied over a range of temperatures (20-200°C) and pressures (172-1720 kPa). Three different fiber types (DKE X, DKA X, and K22XX) and three fiber volum…
Abstract This paper provides an overview of recent progress made in the area of cellulose nanofibre-based nanocomposites. An introduction into the methods used to isolate cellulose nanofibres (nanowhiskers, nanofibrils) is given, with details of their structure. Following this, the article is split into sections deali…
Des echantillons de diatomees tychoplanctoniques et epilithiques ont ete preleves tous les mois pendant une annee sur 18 stations dans le cours inferieur de quelques fleuves et rivieres de la region nord-centre du Portugal. L'analyse canonique des correspondances a ete utilisee pour examiner les relations entre les va…
The physical and mechanical properties of aliphatic homopolyesters from monomers obtainable from renewable resources, namely, 1,3-propanediol and succinic acid, were improved by their combination with aromatic urethane segments capable of establishing strong intermolecular hydrogen bonds. Segmented poly(ester-urethane…
The surface free energy and its dispersion and polar components of pigskin were determined by wettability measurements. The contact angles and work of adhesion of solutions of the synthetic model adhesive sequence poly(Gly-Tyr-Lys) inspired by marine adhesive proteins were measured on the epidermis and the dermis of p…