Materials Literature
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A new quantitative corrosion testing procedure for copper and copper alloy corrosion inhibitors was developed, with the aim of calculating corrosion protection in percent for each inhibitor on trial. 2-aminopyrimidine, 2-amino-5-mercapto-1,3,4-thiadiazole, benzotriazole, 5,6-dimethylbenzimidazole, 2-mercaptobenzimidaz…
MnBi bulk samples with the low temperature phase are successfully prepared by arc-melting under a He atmosphere. Samples with the high temperature phase are firstly prepared by rapidly quenching a molten solution of Mn and Bi which is arc-melted at an atmospheric pressure of He gas. Subsequently, zone-melting is perfo…
Pressure induced B4 (wurtzite) -B1(rocksalt) transition of ZnO was investigated by energy dispersive X-ray diffraction method up to 12GPa and 1000°C. The phase boundary between the B4 and B1 phases can be described by a straight line with P/GPa=6.1-0.0012*T/°C. Under non-hydrostatic condition, the phase transition at…
Layered double hydroxides (LDH) with the hydrotalcite-like structure, but containing Ni(II) and V(III) cations in the layers, have been prepared by the constant pH method. Characterization by elemental chemical analysis, powder X-ray diffraction, differential thermal analysis, thermogravimetric analysis, FT-IR spectro…
Non-ionically templated [Si]-MSU-1 mesoporous silicas have been prepared in weakly ionic sodium salt solutions from a non-ionic silica precursor and exhibit highly symmetric bimodal mesopore systems and demonstrate the immense flexibility of the non-ionic templating system.
The failure of oxide scales formed on mild steel (mass contents of 0.17% C, 0.13% Si, 0.72% Mn) was investigated using a high‐temperature tensile test technique over the temperature range 830 – 1150°C. Strain and strain rates used were 1.5 – 20% and 0.02 – 4.0 s −1 , respectively. The scales were 10 – 300 μm thick. Th…
The problem of premature failure of rotating machines fed by inverters appears to be of crucial importance. Understanding of the phenomena caused by this new type of supply on the stator insulation of motors provides enhanced reliability of the inverter/motor set. After identifying the stresses created by this type of…
Vanadium oxide films were prepared by dip‐coating from V‐oxoisoproxide sols and heating at 300°C for 1 h. Transmission electron microscopy combined with electron and X‐ray diffraction revealed that the films consist of disordered grains with an orthorombic structure . Electromotor force (emf), cyclic voltammetric (CV)…
On-site partial discharge (PD) measurement is required to ensure proper installation of extra high voltage (EHV) cable systems accessories. To achieve high sensitivity and good localization, two problems have to be overcome. First, the strong high frequency in long XLPE cables requires that the sensors be located alon…
X-Ray amorphous ZnO nanoparticles homogeneously dispersed in a silica matrix were evidenced in ZnO-SiO 2 nanocomposites obtained by a sol-gel method and heated to 700 °C. TEM observations indicated that the particle size slowly increases with temperature and zinc oxide content, reaching an upper limit of 12 nm. Throug…
The pore size of MCM-41 can be finely tuned from 38.3 to 52.7 Å with a narrow distribution by carefully adjusting the initial pH of the synthesis mixture from 11.5 to 10.0.
The usefulness of Mehlich 3 (M3) reagent was evaluated as a method to extract numerous elements from coalmine soils in As Pontes (Spain) showing a wide range of physicochemical properties. Critical levels (deficiency and/or toxicity) were established for plant available elements extracted by this reagent. The M3 metho…
ABSTRACT The effect of heating film‐forming solutions on physical and molecular properties of cast wheat gluten (WG) films was determined. Glycerol‐plasticized films were cast from alkaline (pH 10), heat‐treated (55,75, or 95°C for 10 min) solutions of WG in aqueous ethanol. Protein solubility (PS) of films in water d…
The isolation of poly-(L-lactide) (PLA)-degrading microorganisms was investigated. A PLA-degrading actinomycete, strain No. 3118, was isolated and tentatively identified as a member of the genus Amycolatopsis. The optimum conditions for degradation of PLA were 43 degrees C at about pH 7 in a mineral salt medium with a…
Aluminium-copper of (99.99%) high purity eutectic alloy was melted in a graphite crucible under vacuum atmosphere. This eutectic alloy was directionally solidified upward with a constant growth rate V, and different temperature gradients G, and also with a constant temperature gradient and different growth rates in th…
A pilot study was conducted to assess the potential for using southern pine particles derived from construction waste to create a cement-wood composite suitable for exposed structural applications. Panels fabricated from copper chromium arsenate (CCA)-treated as well as untreated particles were cut into individual sam…
Direct measurement of electric machine losses using the principle of the calorimetric method is described in this paper. The design and construction of a double chamber calorimeter (DCC) that can be used for measurement of harmonic losses of a 7.5 kW cage induction motor is discussed. The advantages of this approach a…
It is investigated how the reinforcement of elastomers by active fillers (e.g. carbon black) is influenced by the universal features of the disordered filler structure. This is done for three reinforcement mechanisms on different length scales, corresponding to different interactions within the filled system.
Among six grades of polyvinyl alcohol (PVA), PVA V (degree of hydrolysation 99.45%, molecular weight 140000-150000) and PVA VI (degree of hydrolysation 98-99%, molecular weight 85000-146000) were selected for combination with PVA I (degree of hydrolysation 99%, molecular weight 17300) to prepare composite films with d…
Integrated photonic radio frequency (RF) phase shifters with dc voltage control have been realized using a nested dual Mach-Zehnder modulator configuration in a new nonlinear optical polymer, CLD2-ISX. These modulators have a V/sub /spl pi// of 10.8 V and exhibit excellent frequency performance measured up to 20 GHz.…