Materials Literature
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Microwave dielectric studies on the dynamics of water in poly(vinylpyrrolidone) (PVP)−water mixtures and 1-vinyl-2-pyrrolidinone (VP)−water mixtures were performed to compare the relaxation processes of water in polymer−water and monomeric compound−water mixtures. For the PVP−water mixtures, a relaxation peak for wate…
Changes in the chemistry of the acidic Chilean Andisols in response to various ameliorant treatments (gypsum, dolomitic, and calcitic limestone) and their effects on ryegrass (Lolium perenne) production were studied in laboratory incubation and greenhouse experiments. Dolomitic and calcitic limestone alone and in comb…
The longitudinal and transverse ultrasonic velocities and attenuations of single-phase polycrystalline colossal magnetoresistance compound ${\mathrm{La}}_{0.60}{\mathrm{Y}}_{0.07}{\mathrm{Ca}}_{0.33}{\mathrm{MnO}}_{3}$ have been measured at a frequency of 10 MHz, between 50 and 300 K. At the ferromagnetic and insulato…
Molecular dynamics simulations were performed on the relaxation of fully extended polyethylene chains, varying in length from 600 to 4000 CH2 units. When a chain has more than 1200 CH2 units, the relaxation proceeds in three stages, subglobule formation, subglobule growth, and subglobule coalescence into one globule.…
The complexes [Yb(bind)2(DME)2], [Yb(MePhpz)2(DME)2], [Yb(azin)2(DME)2], and [Eu(Ph2pz)2(DME)2] (bindH = 4,5-dihydro-2H-benz[g]indazole; MePhpzH = 3-methyl-5-phenylpyrazole; azinH = 7-azaindole; Ph2pzH = 3,5-diphenylpyrazole; DME = 1,2-dimethoxyethane) have been prepared by redox transmetallation between ytterbium or…
Manganese zinc (MnZn) ferrite powders were prepared via the hydrothermal treatment of a homogeneous mixture of the raw oxides (i.e., Fe 2 O 3 , ZnO, and Mn 3 O 4 or MnO) at temperatures of 220°‐320°C in air or an inert atmosphere. The final results of the hydrothermal reactions between the raw oxides were fine powders…
We investigate theoretically a novel experimental polymer route to C 3 N 4 materials. Starting with simple molecules, we follow the initial steps of oligomerization of several carbodiimide based C 3 N 4 precursors. A sequence of hypothetical models with a chemically resonable structure for the resulting low-density C…
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…