Materials Literature
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Phase relations and lattice constants in the MgO–Al 2 O 3 –Ga 2 O 3 system at 1550°C have been determined experimentally. In a large part of this system, only a nonstoichiometric spinel is stable. Compositions as extreme as 12.5 mol% MgO–20.5 mol% Ga 2 O 3 –67 mol% Al 2 O 3 for a homogeneous spinel are possible. In th…
Reactions of (por)ZrCl2 [por = octaethylporphyrinato (oep) or tetraphenylporphyrinato (tpp) dianion] with TlCp and diphenylacetylene in the presence of Na/Hg or Mg produce novel low-valent zirconium porphyrin complexes (por)Zr(η5-Cp) 1 and (por)Zr(η2-PhCCPh) 2, respectively; spectroscopic and/or structural data for 1…
Optical and surface analysis techniques such as infrared spectroscopy, ellipsometry, and Auger electron spectroscopy (AES) and x‐ray photoelectron spectroscopy (XPS) have been used to study the way in which excess Si is incorporated in nonstoichiometric films deposited by a low pressure chemical vapor deposition techn…
Dispersion and localization of Pt species in mazzite zeolites (0.3% Pt) were studied using an in situ EXAFS technique in the fluorescence mode and transmission electron microscopy. It was shown that an ion exchange with a Pt(NH 3 ) 4 Cl 2 solution followed by calcination led to the formation of small clusters of PtO 2…
Spherical microporous reservoir-type microcapsules, fabricated using a W/O/W double emulsion technique with solvent evaporation and composed of 330 kD poly(beta-hydroxybutyrate-hydroxyvalerate (P(HB-HV)) (10.8% HV)/20% PCL II containing a range of bovine serum albumin (BSA) loadings, were incubated in Hank's buffer, p…
The oxidation behavior of Zr(Fe,Cr)2 precipitates being present at the surface of Zircaloy-4 was examined with microprobe Auger electron analysis, focussing attention on the oxidation behavior of chromium and iron in the early stage of oxidation where the oxide film was coherent. Chromium formed a thin oxide layer at…
The ability to discriminate between red, green and blue cotton fibres from various sources by comparing the microscopic characteristics and fluorescent properties (comparison microscopy) and visible spectra (microspectrophotometry) of the fibres in each colour group was assessed. A summary of the discriminating abilit…
The statics of isolated elastic domains (twins) in epitaxial thin tetragonal films grown on a cubic substrate is investigated theoretically. Different possible variants of the geometric shape of a domain are studied: plate, trapezoidal, and triangular. The nonuniform internal stresses, which also exist in polydomain e…
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…