Materials Literature
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Thermal degradation of bisphenol A polycarbonate (PC) has been studied in nitrogen and air from room temperature to 900 °C by high-resolution thermogravimetry (TG) with a variable heating rate in response to changes in the sample's degradation rate. A three-step (in nitrogen) or four-step (in air) degradation process…
The relative ease with which alumina–SiC nanocomposites polish, compared with monolithic alumina, has been noted in the literature and taken to be an example of the beneficial ‘nanocomposite effect’ stemming from an apparent strengthening of the grain boundaries. The percentage of ‘polished’surface, as opposed to area…
This study investigates the characteristics of permanent magnet assisted synchronous reluctance motor (PMASynRM) using coupled FEM and Preisach modelling. The focus of this paper is the characteristics analysis of d, q axis inductance according to magnetizing direction and quantity of interior permanent magnet for PMA…
The formation of scale on heat transfer surfaces during pool boiling is a frequent engineering problem where aqueous solutions are involved. In this investigation the effect of modified surfaces on deposition of calcium sulfate on heat transfer surfaces was studied. The surfaces were either implanted with ions such as…
This paper presents a system for assessing yarn structure. Image analysis techniques and mathematical methods are used to develop the method of estimating basic structural parameters of yarn thickness, hairiness, and twist. The method provides numerical characteristics of the structure at each point of the yam length.…
Single bubble sonoluminescence in an air-water system has been shown to occur along a unique surface in the acoustic pressure-ambient radius-gas concentration parameter space where the bubble is stable both in shape and in (average) size. In this paper, we show how the bubble deviates from the expected path (traced by…
The epitaxial growth of CeO2 films on SrTiO3(001) has been investigated over a wide range of growth parameters using oxygen-plasma-assisted molecular beam epitaxy. The lattice mismatch for CeO2 on SrTiO3(001) is 2.0% (compressive) if the film nucleates with a 45° rotation about [001] relative to the substrate (i.e., C…
A comparison between the Newton-Raphson method and the fixed-point technique in hysteretic magnetic field problems is presented. Four different approaches are studied and contrast between them in terms of the convergence rate and computation time consumption is highlighted. The Newton-Raphson-based approaches are foun…
A series of acceptor-substituted nickel(diimine)(dithiolate) complexes were synthesized and characterized. Both ground-state and excited-state dipole moments were determined. These complexes have ground-state dipole moments (μ g s) in the wide range from 4 to 17 D, in contrast to the near constant μ g s reported earli…
Lamellar diblock copolymers are investigated under large amplitude oscillatory shear (LAOS) at temperatures close to the order–disorder transition temperature (TODT). Increasing strain amplitude leads to a double flip of orientation. The state of orientation depends on an effective shear rate as in similar experiments…
Effects of the naturally occurring compounds azadirachta indica (leaves), punica granatum (shell), and momordica charantia (fruits), on corrosion of mild steel in 3% sodium chloride (NaCl) were assessed using weight loss, electrochemical polarization, and impedance techniques. Extracts of the compounds exhibited excel…
A grazing-incidence spectrograph is designed by use of the flat-field image-focusing property of a spherical varied-line-space grating. Optimum grating parameters for mechanical ruling are selected by application of genetic algorithms. Two gratings, one for 2-5-nm and the other for 5-20-nm spectral regions, are design…
New polymer networks were prepared by free radical initiated copolymerization of crystallizable α,ω-bismethacrylate-terminated poly(octadecyl vinyl ether) (polyODVE) with butyl acrylate (BA). The polyODVE bismacromonomers were obtained by end-capping the bifunctionally living cationic polymerization of ODVE with 2-hyd…
This paper reports on the adsorption of different organic pesticides by hydrotalcite, hydrotalcite heated to 500 degrees C and organo-hydrotalcite in aqueous medium by employing adsorption isotherms, and using X-ray diffraction and infrared spectroscopy techniques. The results suggest that the adsorption capacity of t…
A 96-channel phased array probe for echocardiography using a single-plate, 0.91Pb(Zn 1/3 Nb 2/3 )O 3 –0.09PbTiO 3 (PZNT 91/9) single-crystal transducer with dimensions of 14×20 mm has been fabricated to realize greater sensitivity and broader bandwidth properties. The center frequency of the probe, 3.5 MHz, was select…
The doping mechanism of Sn in In 2 O 3 (ITO) powder was investigated using 119 Sn transmission Mössbauer spectroscopy (TMS) and X-ray diffraction (XRD) in view of the chemical state of Sn. Deconvolution analyses of TMS spectra revealed that there was substitutional Sn 4+ coordinated not only by 6 oxygen atoms [Sn In ·…
Divalent molecular lanthanide complexes are shown to offer promise as tunable light emitting materials in thin film electroluminescent displays for the first time in this study. Bright orange luminescence is obtained from thin film EL device structures containing bis[tris(dimethylpyrazolyl)borate]europium(II) (1), whi…
ZnO whiskers were epitaxially grown by a chemical-vapor deposition technique employed at atmospheric pressure. Highly oriented ZnO whiskers grew at a substrate temperature of 550°C on (0001)α-Al 2 O 3 substrates with a growth rate of 3.7 nm/s. X-ray diffractometry revealed that the epitaxial relationship between the w…
Conformational diversity within unique amino acid sequences is observed in diseases like scrapie and Alzheimer's disease. The molecular basis of such diversity is unknown. Similar phenomena occur in subtilisin, a serine protease homologous with eukaryotic pro-hormone convertases. The subtilisin propeptide functions as…
The spectra of internal ac impedance and fluxmetric and energetically effective circular permeabilities are calculated for infinite slab and cylinder in classical and domain models. The domain models assume transverse bar domains for a slab and transverse circular disk domains for a cylinder, with technical magnetizat…