Materials Literature
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The electron donating properties of ceria activated at 300, 500 and 800 °C and its mixed oxides with alumina are reported from the studies on adsorption of electron acceptors of various electron affinity. The surface acidity/basicity of the oxides have been determined by titration method and H 0,max values are reporte…
Boundary element method(BEM) is applied to computation of 3D eddy current fields due to heavy current leads in a 360MVA/500kV power transformer. To improve numerical accuracy, triangle polar coodinate mapping and addition‐substraction technique are chosen to evaluate singular integrals. The effects of different shield…
The influence of overlap length and overlapping design on core loss and magnetizing current of single‐phase two‐leg transformer core has been investigated The investigation was performed experimentally, on scaled models, and numerically, using 2D finite element method Two types of overlapping, mitred and staggered one…
Abstract This paper reviews several procedures for the removal of instrumental contributions from measured x-ray diffraction profiles, including: direct convolution, unconstrained and constrained deconvolution, an iterative technique, and a maximum entropy method (MEM) which we have adapted to x-ray diffraction profil…
SUMMARYThe phosphating of steel in an aqueous zinc-phosphating bath has been studied. Phase formation was controlled potentiostatically and phase identification was performed by X-ray diffraction, using synchrotron radiation, which enabled the time development of phosphate coatings to be studied. Two phases are formed…
Tris(naphthalene-2,3-dioxy)cyclotriphosphazene (TNDOCTP) forms a channel-type clathrate with benzene and also a cage-type one with p-xylene. X-Ray analysis of the p-xylene clathrate showed that the cavity size and form were adequate to accommodate para-disubstituted benzenes into the cage lattice. The extracts obtaine…
This article presents an analysis of the 27 wt.% SiC whisker/A1 2 0 3 c01 posites exposed to air for periods up to 180 hours at 1100 C to 1450 C. Experimental results indicate that SiC whisker reacts with oxygen and alumina to produce a mullite-rich surface layer on tested composite specimens. The surface oxidation re…
The sliding wear behaviour of M50 and Tl high speed steels was investigated using a pin on disc machine. The wear mechanism is one of severe oxidation wear and wear damage was more severe in M50 steel; this was attributed to its lower primary carbides content. The following factors improve the wear resistance of the s…
Abstract The synthesis and lithographic characterization of the three positional isomers of polyhydroxystyrene is described. Large differences in dissolution rates are found as a function of the position of the hydroxy group, which are explained in terms of intra‐ vs. intermolecular hydrogen bonding and steric shieldi…
Article EXAFS Study of the Aging of LaNi5 and LaNi4.5Mn0.5 Compounds During Tritium Storage* was published on January 1, 1994 in the journal Zeitschrift für Physikalische Chemie (volume 183, issue 1-2).
Compressive strength of β-Titanium alloy (Ti-15V-3Cr-3Sn-3Al) has been investigated in the wide temperature range of 77 to 673K and at strain rates from 10-4 to 2×103S-1. The stress-strain relations are influenced by the change of temperature arizing from the heat conversion of plastic work, while almost independent o…
A HTS/metal/low dielectric constant polymer dielectric hybrid interconnect structure was fabricated using high density interconnect (HDI) copper/polyimide processing techniques. Nondegraded superconducting properties, J/sub c/ of over 1 MAcm/sup -2/ and T/sub c/ of 88 K, were obtained using optimum processing conditio…
In the photoreaction with 9, 10-dicyanoanthracene, tropone 1 behaved as an electron donor to give an [8π+ 4π] adduct 10via an electron-transfer mechanism in a mixed solution of MeCN–CH2Cl2(1 : 1); other products characterized were an unprecedented meta-cycloadduct 7, a trans[2π+ 4π]6, and a [4π+ 4π]–[2π+ 4π] adducts 8.
In the present study we used alginic acid and degradation products of alginic acid as carbon source for the production of biodegradable plastic, poly-β-hydroxybutyrate (PHB), by Alcaligenes eutrophus H16, and the possibility of PHB production from seaweed will be discussed
The 1:1 PbO:V2O5 semiconducting glass prepared by quenching an equimolar mixture of PbO and V2O5 melt (650 °C) at liquid-nitrogen temperature has been investigated by XAS (X-ray absorption spectroscopy) at 25 and –180 °C. The spherical wave approximation was used, applying parameters extracted from the crystallographi…
The flow stress of M200 maraging steel, C1008 steel, and 6061‐T6 aluminum at low temperatures to 123 K and at a strain rate of about 103 s−1 is measured using split Hopkinson bar (SHB). Liquid nitrogen is used to cool the specimen to the desired temperature. The flow stress of M200 increased to 1.93 GPa at 123 K, an i…
IrSb3 and the isostructural compounds RhSb3 and CoSb3 were recently identified as new promising thermoelectric materials (Caillat et al. 1993a). The use of these materials in thermoelectric devices requires that their properties shall not change over long periods of time at operation temperature. Temperature stability…
Effects of B content on the sintering behavior of Nd15Fe85−xBx (x=4–10 at%) alloy powders were investigated through microstructural observations, and measurements of DTA, linear shrinkage and magnetic properties. In the case of x≥6 at%, a liquid phase forms from ternary eutectic reaction of Nd-rich, Nd2Fe14B and Nd1.1…
This note discusses some basic concepts underlying isotropic material failure criteria under multiaxial loadings. It also describes the shapes and features of the associated failure surfaces in three-dimensional stress space. Failure criteria for ductile materials are first reviewed. They are then generalized so that…
The pyrolysis of a low-oxygen SiC fiber, prepared by the electron-irradiation curing method, has been investigated in N2 atmosphere at temperatures from 1673 to 1973K. Then, the pyrolytic behavior in N2 was compared with that in Ar. The fiber absorbed a considerable amount of nitrogen, and consequently, the mass loss…