Materials Literature
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A vacuum ultraviolet photoionization study of atomic Ir in the region between 40 and 70 eV was performed with the use of monochromatized synchrotron radiation and photoion detection. The atomic beam of Ir was obtained with the technique of evaporating thin Ir wires. The photoion signals are compared with the theoretic…
Binary SmxFe100−x(2<x<12) thin films were made by rf sputtering of the target onto preheated quartz glass substrates. Structural characterization, magnetic measurement, and microstructure observation were carried out by x-ray diffractometer, vibrating sample magnetometer, scanning electron microscope, an…
Irradiation (λ > 390 nm) of acidic anaerobic aqueous solutions of iron(III) tetrakis(2-N-methylpyridyl)porphyrin, in the presence of mono- or di-basic amino acids or their N-acylated derivatives, generates the iron(II) porphyrin and the corresponding acyloxyl radical; subsequent decarboxylation of the latter gives the…
A methodology is proposed for the validation of compact thermal models of electronic packages which utilizes data and simulations obtained from a simple but realistic system containing the package. The test system used to demonstrate the methodology is the enclosure specified by the Electronic Industries Association J…
Microbially influenced corrosion (MIC) behavior of stainless steels in natural Seawater, the accelerated corrosion test method and the countermeasure to MIC were studied. Electrochemical measurements and immersion tests were carried out. Furthermore, the effect of the surface. treatment of a stainless steel on the MIC…
The dibromodihydrodipyrrin diester 7 was prepared by reaction of the corresponding pyrrole 6 with dimethoxymethane and BF3·Et2O. Subsequently 7 was converted into the dibromodihydrodipyrrin 2 in moderate yield. The diformyldihydrodipyrrin 3 was readily prepared by methylenation of the pyrrole 9 with BF3·Et2O, followed…
The formation of mullite/SiAlON/alumina composites was studied by infiltrating a SiAlON/alumina‐base composite with two different solutions, followed by thermal treatment. The base composite was prepared from a mixture of tabular Al 2 O 3 grains, fume SiO 2 , and aluminum powders. The mixture was pressed into test bar…
In this paper we prove the convergence of an iterative scheme of fractional steps type for the phase-field transition system. The use of this method simplifies the numerical algorithms due to its decoupling feature. The 2D case is considered and numerical results are reported.
Article Studies on the biodegradable poly(hexano-6-lactone) fibers 1. Structure and properties of drawn poly(hexano-6-lactone) fibers (Technical Report) was published on January 1, 1997 in the journal Pure and Applied Chemistry (volume 69, issue 12).
The influence of diastereoisomerism on the electrochemical behaviour of the atropisomeric cyclophanes 1a and 1b was found by cyclovoltammetric studies. Compound 1a can be oxidized and reduced reversibly in a two step redox process similar to that of model compound 2. In contrast, 1b shows a different electrochemistry.…
This paper presents a new electroplating process that uses an electrolyte jet containing SiC particles for the formation of electrodeposited Ni–P matrix composite coatings. The electrolyte jet remarkably increases the limiting current density in electroplating, so that the deposition rate will be approximately 10 time…
We developed a new positive working photosensitive polymer for semiconductor surface coating. Base resins were considered three kinds of heat-resistance polymers and we found that polybenzoxazole precursors(PBO) with photosensitizer diazonaphtoquinones and silicone modified polyamic acids added as adhesion promoters s…
Low alloy Cr and CrMo steels have been studied to determine their susceptibility to hydrogen embrittlement. The steels were quenched at a constant cooling rate of 30 K s-1 and tempered at 673 and 973 K. Hydrogen charging of steels was carried out in 0.5 M H2SO4 solution without and with addition of propargylic alcohol…
Organic-inorganic hybrid coating films were prepared using vinyltriethoxysilane and tetraethoxysilane by the sol-gel method on polyimide substrates. Tetraethoxysilane (TEOS) and vinyltriethoxysilane (VTES) or polyvinyltriethoxysilane (PVTES), which was obtained by the radical polymerization of VTES, were used as start…
Chemical vapour deposition (CVD) is a promising process for the production of ferroelectric complex oxide films having a large electro-optical coefficient. We report the epitaxial growth of high-quality BaTiO 3 films using a single-source CVD process. A variety of epitaxial relationships have been achieved with BaTiO…
The importance of layer structures for the synthesis of zeolite beta is demonstrated. Zeolite beta is formed via a layered-aluminosilicate, which forms spherical agglomerates with diameters in the range 20–50 µm. The transformation into the beta form occurs within the agglomerated particles. The agglomerates are prese…
29Si- and 13 C-CP/MAS-NMR-spectroscopy were used to investigate the influence of substance-specific parameters such as silane concentration, type of silane, pH and moisture content of the filler on the silica/organosilane reaction mechanism. After reviewing several theoretically conceivable reaction models, one horizo…
Although the exact mechanism of self-healing effect of chromate coating is still not clearly understood, this mechanism is known to prevent not only the corrosion of metal substrate under the chromate coatings but also from the coating defects. This research focuses on investigating the corrosion behavior of chromated…
Specific adsorption of anions on surfaces of metals and oxidized metals is reviewed in relation to the hard and soft acids and bases principle. Anions classified as soft bases are readily chemisorbed on the bare metal surface equivalent to a soft acid, resulting in suppression and stimulation of metallic corrosion in…
In this paper, an important discussion of transformer design and modeling is given. Anisotropy effects of the transformer laminations have been stressed in the light of the investigation of a three-phase three-limb transformer T-joint. Three simple T-joint modeling schemes accounting for the lamination anisotropy are…