Materials Literature
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A method to calculate the low frequency complex electric field in polluted insulators is proposed. The method is based on a quasi-static approximation which permits the decoupling of Maxwell's equations. The method is implemented numerically through the finite element technique by defining a complex functional.
The third order nonlinear optical susceptibilities χ(3) of BaO-TiO2-B2O3 glasses have been measured by the third harmonic generation (THG) method. Raman spectroscopic investigation revealed that Ti4+ ions mainly exist as 4-coordinated. It was found that the addition of TiO2 to BaO-B2O3 glass increases the χ(3) as well…
Ferromagnetic glass-ceramics can be expected to be useful as thermoseeds for hyperthermia of cancer, especially cancer located at deep parts of body, since hysteresis loss heating locally occurs at the cancer when they are subjected to an alternating magnetic field. Glass-ceramics containing a large amount of α-Fe fin…
Gunshot testing of power transmission ceramic and nonceramic insulators was performed and the results were compared to the in service experience of a large electric utility. Significant differences in the response of ceramic and nonceramic insulators to being gunshot were found. These differences were reductions in el…
Zirconium is prone to localized corrosion in acidic chloride (Cl–) solutions contaminated by oxidizing ions, such as ferric or cupric ions. This tendency can be reduced by ensuring that the zirconium surface is clean and smooth. The effect of surface condition on localized corrosion of zirconium in acidic chloride sol…
The crystal structures of (NaLa)(MW)O 6 (M=Co, Ni) suggest that both adopt a monoclinic perovskite-type structure [M=Co: a=5.546(3), b=5.545(4), c=7.903(6) Å, β=89.99(3)°; M=Ni: a=5.517(5), b=5.518(7), c=7.862(2) Å, β=90.02(4)°; space group P2 1 /m]. The structure consists of an ordered arrangement of MO 6 and WO 6 oc…
The effect of resorcinol formaldehyde (RF) resin on the stability of the adhesion interphase between rubber compounds containing different amounts of RF resin and the thin brass film deposited on a glass plate was investigated under the conditions of humidity aging. The depth profiles of the adhesion interphase were e…
The molecular dipole moment and vector component of the hyperpolarisability of 4-[N,N-bis(2-acetoxyethyl)amino]phenyl-1-azo-2′ -(3′,5′-dinitrothiophene) have been calculated using a semi-empirical approach and the results compared with experimental measurements in solution. The calculated values are found to be highly…
The isothermal phase relations for the MnO-SiO2-TiO2 system have been investigated at 1673 K by a chemical equilibration technique. Iso-activity curves for MnO are drawn from the experimental results of the activities as well as those for SiO2 and TiO2 calculated by Schuhmann's tangent intercept procedure.1) Iso-activ…
Gas-phase deposition and subsequent thermal activation of Cr(acac) 3 on the surface of fumed and precipitated alumina supports have been studied by diffuse reflectance FTIR spectroscopy, TG–DTG, TPO and chemical analysis. It has been found that stabilisation of Cr(acac) 3 on alumina occurs in a molecular form owing to…
Abstract Die Iodoplumbate (Me 3 NC 2 H 4 NMe 3 ) 2 [Pb 3 I 10 ] ( 1 ) bzw. (Me 3 NC 3 H 6 NMe 3 ) 3 [Pb 3 I 9 ] 2 ( 2 ) und (Me 3 NC 3 H 6 NMe 3 ) 2 [Pb 3 I 10 ] ( 3 ) bilden sich bei der Umsetzung von PbI 2 mit NaI und (Me 3 NC 2 H 4 NMe 3 )(PF 6 ) 2 oder (Me 3 NC 3 H 6 NMe 3 )(PF 6 ) 2 in DMF. In 1 und 2 s…
The initial development and growth of defects from ‘engineered’ surfaces, i.e. fine abraded, polished, shot peened etc., often dominates the resulting component lifetime, particularly for materials of high strength and limited ductility. When subject to the conjoint action of stress and environment this lifetime is im…
The compositional gradient and ion selectivity in the final protective rust layer of the Cr-substituted goethite, α-(Fe1-x, Crx) OOH, on a weathering steel have been discussed by examining the spontaneously and artificially formed Cr-substituted goethites. It was found that the Cr content in the spontaneously formed f…
The breakdown of intact collagen from bone or hide to produce commercial gelatin results in a poll/disperse product with respect to molecular weight. The mechanism of this breakdown and the role of the individual collagen chains in gel formation is not clearly understood.Analysis of these polypeptide chains for molecu…
Abstract Blaues, diamagnetisches Di(iridiumphthalo cyaninat(2), [(Irpc 2− ) 2 ] wird durch kontrollierten thermischen Abbau von Di(acido)phthalocyaninatoiridaten in einem inerten, hochsiedenden Lösungsmittel wie 1‐Chlor‐naphthalin oder unter vermindertem Druck (T < 350°C) dar gestellt. Es ist in Pyridin (py) unter…
A method is described for synthesising complex silicon lanthanide nitrides by carbothermal reduction and nitridation (CRN) of both SiO 2 –Ln 2 O 3 mixtures and elemental Si–Ln 2 O 3 mixtures at 1400–1450 °C. Syntheses in the Si 3 N 4 –YN system confirm the existence of the compounds YSi 3 N 5 and Y 2 Si 3 N 6 , which…
A significant enhancement of the selective reduction of nitrogen oxide by H 2 is produced in the presence of oxygen over Au/NaY and Au/ZSM-5 catalysts by forming NO 2 and N 2 O 4 intermediates, which are eventually reduced to N 2 .
Poly(β-phenethyl L-aspartate) (PPLA) takes the right-handed α-helical form in 1,1,2,2-tetrachloroethane at moderate temperatures. The transition to the left-handed α-helix occurs at around 85°C in the isotropic solution as well as in the lyotropic liquid crystalline state. In the presence of a denaturant acid, PPLA al…
In situ FTIR spectra of adsorbed CO on CrO3/SiO2 catalysts have been investigated at elevated temperatures to elucidate the nature of the species formed during the reduction process with CO. The results show the formation of three species: bicarbonates, monodentate carbonate and inorganic carboxylate. The reduction of…
The mechanisms responsible for the extremely high Hall-Petch slope of Ky ≈ 5MPa m½, for grain sizes d in the range 3000–200 μm, in fully lamellar (FL) and nearly lamellar (NL) TiAl microstructures are explored. It is shown that the constraints exerted by the neighbouring crystals, particularly those oriented in the ha…