Fundamentals of partial discharge in the context of field cable testing
An article providing background on fundamentals of partial discharge, especially as related to field PD testing of cable systems.
Materials Literature
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Self-Penetration—A Structural Compromise between Single Networks and Interpenetration: Magnetic Properties and Crystal Structures of [Mn(dca)2(H2O)] and [M(dca)(tcm)], M=Co, Ni, Cu, dca=Dicyanamide, N(CN)2−, tcm=Tricyanomethanide, C(CN)3−
The three-dimensional coordination polymers [Mn(dca)2(H2O)] (1) and [M(dca)(tcm)], M =Co (2), Ni (3), Cu (4), dca =dicyanamide, N(CN)2-, tcm = tricyanomethanide, C(CN)3-, have isomorphous structures. In 1 half the dca ligands coordinate directly (through all three nitrogen atoms) to three Mn atoms (all metal atoms are…
Charge, orbital, and magnetic order inNd0.5Ca0.5MnO3
In the manganite ${\mathrm{Nd}}_{0.5}{\mathrm{Ca}}_{0.5}{\mathrm{MnO}}_{3},$ charge ordering occurs at a much higher temperature than the antiferromagnetic order ${(T}_{\mathrm{CO}}=250 \mathrm{K},$ ${T}_{N}=160 \mathrm{K}).$ The magnetic behavior of the phase ${T}_{N}<T<{T}_{\mathrm{CO}}$ is puzzling: its magne…
Fabrication and Electrical Properties of Textured Sr 0.53 Ba 0.47 Nb 2 O 6 Ceramics by Templated Grain Growth
Textured Sr 0.53 Ba 0.47 Nb 2 O 6 ceramics with a relative density of >95% were fabricated using templated grain growth (TGG). Acicular KSr 2 Nb 5 O 15 template particles synthesized via a molten salt process were aligned by tape casting in a mixture of solid‐state‐synthesized SrNb 2 O 6 and BaNb 2 O 6 powders. The re…
Self-Assembling Solid Oxide Fuel Cell Materials: Mesoporous Yttria-Zirconia and Metal-Yttria-Zirconia Solid Solutions
A new class of mesoporous (nickel/platinum)-yttria-zirconia materials, denoted meso -(Ni/Pt)YZ, which may have utility as electrode material in solid oxide fuel cells (SOFCs), have been synthesized by aqueous co-assembly of glycometalates and metal complexes with a surfactant template. These materials form as solid so…
Crystallisation of Polymorphs: Thermodynamic Insight into the Role of Solvent
Dependent on the conditions, crystallisation of polymorphs from solvent may be under kinetic or thermodynamic control. In the latter case the nature of the solvent will be immaterial in respect of the polymorph produced. The conditions under which each of these factors may apply are analysed in detail. The transition…
Low-temperature resistivity minimum in ceramic manganites
Measurements of magnetoresistance and magnetization were carried out on ceramic samples of La0.5Pb0.5MnO3 and La0.5Pb0.5MnO3, containing 10 at. % Ag in a dispersed form. The results obtained for the resistivity at zero applied magnetic field exhibit a shallow minimum at the temperature T∼25–30 K which shifts towards l…
Extensive Void Defects in Mesoporous Aluminosilicate MCM-41
Mesoporous MCM-41 materials with a distinct N 2 -sorption hysteresis behavior have been prepared from pure silica and aluminosilicate−C 16 trimethylammonium (TMA)Br systems by a delayed neutralization procedure. On the basis of the analysis of transmission electron microscopy micrographs of these MCM-41 materials, we…
Dendrimers, a New Class of Candidate Topical Microbicides with Activity against Herpes Simplex Virus Infection
Dendrimers are large highly branched macromolecules synthesized from a polyfunctional core. They have shown a variety of biological properties, including, in some instances, antiviral activity. In this study, five dendrimers were evaluated for in vitro activity against herpes simplex virus (HSV) types 1 and 2 by cytop…
Vesicle-Directed Growth of Silica
Silica-coated vesicles have been produced by the deposition of silica onto unilamellar vesicles from aqueous solution for the first time. The quaternary ammonium surface of the surfactant vesicles is receptive to silica and facilitates deposition of up to 5–10 nm of it. The “petrified” vesicles are stable to dehydrati…
Polymer-Controlled Growth of CdS Nanowires
Very long crystalline CdS nanowires (see Figure) are fabricated here via a polymer-controlled growth approach that involves distribution of Cd2+ ions in a polyacrylamide matrix followed by treatment with thiourea. It is shown that the polyacrylamide plays an important role in controlling the diameter and increasing th…
Cure Kinetics of Hexcel W3T282-42/F155 Graphite/Epoxy Prepreg
Influence of the metakaolin on porous structure of matrixes based in mk/cement
The incorporation of pozzolanic materials in the manufacturing of blended cement has a positive effect on the improvement of blended mortar and concretes performances. These active additions modify porous structure, impeding or delaying the access of aggressive solutions and, therefore materials more durable are possi…
Comparaison de l'altérabilité au brouillard salin des deux pierres calcaires de construction au moyen des mesures pondérales acoustiques et par traitement d'images
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Editorial
Finite Element Analysis of Individual Curved and Straight Thermopiezoelectric Bimorph Actuators
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External radiation as element of improvement infrared thermography measurements
Infrared thermography is a very versatile non destructive technique which among other uses, can be applied to the study of moisture in buildings. However, this particular application can present some problems strictly related to the characteristics of the thermocamera device. In this case the available equipment works…