Materials Literature
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After stating the reasons leading to EDF's interest in 420 kV GIL and the technical and economic imperatives to be considered, the principles adopted for the insulation co-ordination of 420 kV GIL up to a few tens of kilometers long are described. All the insulation coordination approach is based on the global failure…
Wide-band absorbing characteristics in the GHz-range are identified in the ferrite-rubber composite sheets with the periodic structure of an air cavity. Co/sub 2/Z and Ni-Zn ferrites, which have been prepared by ceramic processing, are used as the absorbent fillers. On the basis of a synthesized capacitance and induct…
Plastic behaviour of the β nickel-titanium alloys with nearly-equiatomic compositions, Ti-49.5, 50.0 and 50.5 mol%Ni, has been studied. The alloys were highly ductile due to dislocation glide at temperatures where the β-phase was in equilibrium. The ductility became largest at the lowest temperature in the stability r…
Magnets with high electrical resistance were prepared by electrically isolating Sm/sub 2/Co/sub 17/ and Nd/sub 2/Fe/sub 14/B powder particles. This is achieved by a polymer mixture consisting of epoxy polyester-insulant (EPI), polyvinylbutyral (PVB), epoxy resin (ER) and silane coupling (SC). The properties of interes…
Anion related radiation-induced coloring of optical phosphate glasses doped with chloride or sulfate was studied by means of optical absorption spectroscopy and electron-paramagnetic resonance spectroscopy. The effect of higher sulfate and chloride concentration (to 10 mol%) was investigated for fluoride-phosphate gla…
The protonated tripodal podand [L6 + H]+ forms stable and organized monometallic podates [Ln(L6 + H)]4+ where LnIII is facially nine-coordinated by three wrapped unsymmetrical tridentate binding units. An unusual trifurcated hydrogen bond assists the organisation of the covalent tripod.
Differential scanning calorimetry, dilatometric, dielectric and linear birefringence measurements have been used to study the ferroelastic [C(NH 2 ) 3 ] 3 Bi 2 Br 9 crystal. The x-ray studies showed that it crystallizes at room temperature in the monoclinic symmetry, space group P 2 1 / m . The crystal undergoes a com…
The use of clean steel technology (low sulfur with calcium treatment for inclusion shape control) is a fundamental building block in the development of high performance plate steels. A brief review will be presented of the benefits of calcium treatment and its effect on non-metallic inclusions (sulfides and oxides) an…
Anode-supported cells comprising a three layer structure of a porous composite cathode of Sr-doped LaMnO 3 (LSM) + yttria-stabilized zirconia (YSZ); a thin, dense YSZ electrolyte; and a porous Ni + YSZ anode were fabricated. The anode thickness was varied between ∼1.04 and ∼3.86 mm. The YSZ electrolyte thickness was ∼…
Beneficial effects of coconut oil on prevention of combing damage on different types of hair have been established by protein loss and water retention measurements. In vivo, salon-based, half-head tests confirm these beneficial effects. Beneficial effects were also observed on chemically (bleached) and thermally (trea…
A combination of time-of-flight powder neutron diffraction and powder X-ray diffraction has been used to investigate changes in the cation distribution in a series of isostructural (space group I2/m a≈5.9, b≈3.3 c≈11.3Å, β≈92°) ternary vanadium sulfides, AV 2 S 4 (A=Ti, Cr, Fe, Ni). A progressive change from an invers…
Designed and operated as a totally underground system for environmental and aesthetic reasons, underground cables are exclusively used in the Singapore transmission network at voltages up to 400 kV. Fully metal-clad sulphur hexaflouride (SF/sub 6/) gas insulated switchgear (GIS) is used at all transmission levels to c…
Aging in quenched and strained polymethyl methacrylate(PMMA) has been studied using a differential scanning calorimetry(DSC) and a thermally stimulated deformation recovery measurement as well as a mechanical compression test. The aging in quenched and strained PMMA was compared with the physical aging in quenched PMM…
A novel 18-crown-6 substituted phthalocyanine was synthesized. LB films of this material were prepared by a vertical dipping method and the structures of the films were characterized by absorption spectra, polarized absorption spectra and X-ray diffraction experiments. The results indicate that the films possess highl…
The electronic properties of Nb substitutional impurities in the bulk phase and at the (110) surface of TiO2 are studied by means of density functional cluster calculations. Both the neutral (Nb4+) and the singly ionized (Nb5+) impurity charge states are taken into consideration. Nb is found to introduce a shallow don…
Controlled, plasma-mediated, surface modification of various substrates including inorganic and organic polymers is essential for the creation of miniaturized advanced materials. Many of these approaches have focused on the surface-implantation of specific chemical groups which can be employed for subsequent chemical…
By collating data published over a 30 year period, this text summarizes the progress made in the fields of diffusion and defect research. The large number of studies of iron alloys reflects the commercial importance of hydrogen embrittlement, an phenomenon which has long plagued steel fabricators. Another metal which…
The present paper focuses on vibration analysis for periodic diagnostic testing of circuit breakers. Initially, the basic ideas and the applied procedures are briefly outlined. Then the features of this method are evaluated with basis in the prevailing failure modes according to the CIGRE surveys. Commercial test equi…
The influence of the particle size on the thermal decomposition of ε-hexanitrohexaazaisowurtzitane (HNIW) was studied by means of differential scanning calorimetry (DSC). The kinetics and mechanism for the decomposition were evaluated using integral methods. It was found that the thermal kinetic parameters such as act…
In order to enhance the anisotropy of Nd-Fe-B HDDR treated powder, we have investigated the hydrogen pressure dependence of the recombination reaction temperature, for disproportionated Nd2Fe14B powder. The recombination pressure of hydrogen was higher than the dissociation pressure of NdH2. The addition of Co and/or…