Materials Literature
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Digital feedback technique has advantages of good reproducibility of waveform due to no human error and of no oscillation in control process compared with analog technique. However, it may require many iterations of feedback, especially at higher flux densities, because a considerably distorted voltage waveform should…
Thermally stimulated polarisation (TSPC) and depolarisation current (TSDC) techniques were used to study polarisation and conduction in xFe 2 O 3 (100-x) P 2 O 5 , (14≤x≤47) glasses. TSDC peaks located between 196 and 262 K were attributed to polarisation caused by intrinsic dipolar defects. Electronic conductivity wa…
3Y-TZP/20 mass% La {Co0.5Fe0.5(Fe0.9Al0.1)11}O19 composites were successfully synthesized in situ during sintering from a mixture of 3mol% Y2O3-ZrO2, La(Fe0.9Al0.1)O3, Fe2O3, Al2O3 and CoO powders. Platelike La{Co0.5Fe0.5(Fe0.9Al0.1)11}O19 crystals were grown stably in a 3Y-TZP matrix over a temperature range of 1200…
A new method of pinpointing dielectric fluid leaks on pipe-type and self-contained power cables using perfluorocarbon tracer (PFT) is presented. The method has successfully been used on the Con Edison transmission system to locate leaks of dielectric fluid on both types of cables. Application of the PFT technique does…
A hysteresis curve of AC magnetostriction was measured, magnetizing a grain oriented silicon steel in the direction deviated from rolling direction of the sample. The AC magnetostriction curves were analyzed as harmonics in the interest of noise spectrum of such as a power transformer. The domain structure model in th…
A tridimensional finite element model of isothermal pseudoelastic deformations is proposed in order to analyze and predict the behavior of shape memory alloys (SMA). To perform finite strain calculations, the mechanical modeling is based on a formulation in a non material rotating frame. The constitutive equations in…
BaAl 2 O 4 /aluminum‐bearing composites have been synthesized via the low‐temperature oxidation of Ba‐Al precursors. Ba‐Al powder mixtures that were prepared via high‐energy vibratory milling were uniaxially pressed into bar‐shaped specimens that were then exposed to a series of heat treatments in pure, flowing oxygen…
A carbon conductive film consisting of nanometer sized domains has been patterned by scanning photoablation of polystyrene. The film formation involves the photoablation of a highly insulating polymer, and the redeposition of conductive carbon fragments. This film has been investigated by scanning electron microscopy,…
Two types of crystalline approximants of the decagonal phase have been found in the Al-Cu-Cr system by electron microscopy, in specimens annealed at 1050°C. The structures are orthorhombic with lattice parameters of a = 1.48 nm, b = 1.26 nm, c = 1.27 nm, and base-centered orthorhombic with lattice parameters of a = 2.…
Molecular mechanics methods have been used in order to find the conformations of various syndiotactic polymers in crystals. Three different classes of polymers have been examined: i) polyolefins, such as poly(propylene), polystyrene, poly(1-butene) and poly(1,2-butadiene); ii) polydienes, such as cis-1,4-poly(1,3-pent…
Ara-adenosine (adenine 9-β-D-arabinofuranoside) and ara-guanosine (guanine 9-β-D-arabinofuranoside) are converted into 2′ halogenated ATP and GTP analogues by triflation and subsequent inversion of configuration at C-2′. For the commercially unavailable ara-guanosine a short synthesis starting from guanosine is presen…
The self-catalytic role of zirconium n-propoxide (ZP) has been investigated with respect to the synthetic parameters of ZrO 2 –SiO 2 binary gels. It is found that gelation time can be shortened with a high concentration of tetraethoxysilane (TEOS) in the presence of a small amount of ZP. There are two different gelati…
Many product thermal/physical properties used as model inputs are highly variable and some have not beenindependently determined. The chosen values of these properties can affect the accuracy of weight loss predictions.Peaches were selected as the product to study and three parameters, skin mass transfer coefficient (…
A formation of a mushy region (two-phase zone) for binary melt solidification is theoretically studied on the basis of numerical calculations. The velocity of solidification is determined in the form of a linear function of time for one-dimensional unidirectional solidification regime from a solid wall which is cooled…
The corrosion performance of various stainless steels, nickel alloys, and refractory metals has been evaluated in hot (up to 95°C) methane sulphonic acid. Studies included weight loss coupon exposure tests and potentiodynamic polarisation measurements. Also, the corrosion inhibiting effect of some inorganic inhibitors…
The most widely accepted model for development of defect structure in neutron irradiated graphite has been such that following the first production of a pair of an interstitial and vacancy, di-interstitials and vacancies are formed and their subsequent growth would result in the production of an interstitial plane or…
A spin cast film of poly(bisphenol-A carbonate) was analyzed by XPS using monochromatic Al Kα excitation. The measured atomic composition closely matched the expected stoichiometry of the polymer. Peak positions of the individual chemically shifted C 1s and O 1s components are reported. The results are in general agre…
For the first time the four stereoisomers of a tetrameric side-chain liquid crystalline cyclic siloxane have been isolated in a pure state by high performance liquid chromatography. The structure of one of the stereoisomers was confirmed by 1 H, 13 C and 29 Si NMR. The structures of the remaining three stereoisomers w…
The dissociation process of the Nd 2 Fe 14 B phase in a sintered Nd 16 Fe 76 B 8 powdered magnet was investigated between 300 and 650 °C. The oxidized powders were characterized by Mössbauer spectrometry and x-ray diffraction. The contributions of the dissociation products to the Mössbauer spectra were identified and…
Carbon nanotubes are expected to be one of future fiber materials with extremely high tensile rigidity. Many reports concerning their physical and chemical properties have been published, while there are not enough studies on mechanical properties yet. In the present paper, the structural stability and the mechanical…