Materials Literature
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Effects of magnetic field and hydrostatic pressure on martensitic transformation have been examined by using Fe–Pt, Cu–Al–Ni, Ni2MnGa and Fe–Pd shape memory alloys and Fe–Ni alloys. Following results are obtained; (i) in Fe–Pt, Cu–Al–Ni and Fe–Ni alloys, the experimental magnetic field and/or hydrostatic pressure depe…
We present a model that describes doping-induced contrast in photoelectron emission microscopy by including the effect of surface state distributions and doping-induced band gap reduction. To quantify the contrast, the photoyield from the valence band for near-threshold photoemission is calculated as a function of p-t…
A reliable method of synthesis of 3-bromo-N-methylpyrrole by the use of N-bromosuccinimide and a catalytic amount of PBr3 is reported. The method described opens a facile route to a variety of 3-substituted pyrroles, which are otherwise difficult to access. In addition, conditions under which pure 2-bromo-N-methylpyrr…
To increase the fatigue limit of the Carburized gears, the following five techniques need to be developed: 1) Reduce abnormal surface structure. 2) Obtain a fine grain size. 3) Decrease the retained Austenite structure. 4) Increase hardness under the surface. 5) Improve the residual stress distribution under the surfa…
Molecular dynamics simulations of collisions between gas particles and carbon nanotubes at elevated temperatures show that low frequency thermal vibrations of the nanotube dominate the scattering dynamics and that particle–tube energy transfer in the tube radial direction is far more efficient than that in the axial d…
Die phasenreinen Verbindungen auf dem quasibinären Schnitt Nd2O3–SeO2: Nd2SexO3+2x im thermodynamischen Gleichgewicht wurden durch Festkörperreaktion dargestellt und durch Röntgendiffraktometrie, IR-Spektroskopie und DSC-Messungen charakterisiert. Dabei wurde neben den bereits bekannten Phasen Nd2Se4O11, Nd2Se3,5O10,…
The synthesis, crystallography and solution luminescence properties of [Cu18(hfac)10(CCC4Hn9)8] are reported.
The Pb L III -edge EXAFS for PbTiO 3 was measured in the temperature range from 20 K to 873 K. The structural changes in Pb-O and Pb-Ti atomic pairs through the critical temperature (763 K) due to the phase transition from tetragonal to cubic phase were discussed from the local point of view. Three types of atomic pai…
Approaches suitable for analyses of superparamagnetism are studied for a well-isolated ferromagnetic nanoparticle assembly. In order to reduce the effects of the particle size distribution, we prepared iron-nitride particles with a narrow size distribution. In the case of static behavior, it is clarified that the conv…
In this paper, we study the electromagnetic fields propagating through a slab which permittivity and permeability are simultaneously negative. We show that symmetry properties of the wave solution remove all ambiguity in the choice of the sign of the wave numbers inside the slab. Upon developing the Green's functions…
Effects of particle size, velocity, and temperature on the splat morphology have been well studied in the open literature. Effects of melt fraction on deposition efficiency and splat morphology are, however, not well understood. In this paper, we will focus on the melting behavior of in-flight particles and their impa…
From a colloid-chemical viewpoint, an attempt was made to elucidate the mechanism of calcareous deposition on steel plates cathodically protected in seawater. When the catholic current density was increased with keeping the total electric quantity passed constant, it was found that the amounts of both calcium carbonat…
Conducting semi-interpenetrating network composites with low conductivity percolation threshold were synthesized from waterborne conducting polyaniline (cPAn) and melamine-urea resin. A perfect network of cPAn in the composite was observed by means of TEM (see Figure). The conductivity stability of cPAn in water was i…
Nickel, molybdenum and nickel–molybdenum catalysts supported on niobia and on alumina were prepared by wet-point impregnation and calcination at 723 K. The catalysts were characterised in their calcined form using nitrogen adsorption (BET method), X-ray diffraction, X-ray fluorescence spectroscopy, diffuse reflectance…
The aim of this study were to fabricate a short-fiber-reinforced SiC composites by hot-pressing using an Al2O3-Y2O3-CaO mixture as sintering additive, and, to investigate the effect of processing parameters on the mechanical and thermal properties of SiC/SiC composites containing BN-coated Hi-Nicalon short fibers. Fib…
In this paper we study the spin wave spectra of quasiperiodic magnetic superlattices following a Fibonacci sequence. We consider superlattices that are composed of two simple cubic ferromagnetic materials which interact by bilinear and biquadratic exchange couplings at the interfaces. A transfer matrix treatment is em…
Crystallization of lysozyme from solutions has been studied by the atomic force microscopy method. The surface morphology and the growth kinetics of several faces of the orthorhombic and monoclinic modifications of lysozyme crystals are considered. The surface images are obtained at molecular resolution. For the (010)…
Abstract Polyolefins (LDPE and HDPE) can be ozonized with ozone/air gas flow to create peroxide and hydroperoxide groups on polymers. These reactive groups can be used to initiate radical polymerization of vinylic monomers and produce graft copolymers. In this study, the optimization of the experimental conditions and…
A DFT study of CC bond hydrogenolysis in alkanes on silica-supported zirconium monohydrides (Si−O)3ZrH and dihydrides (Si−O)2ZrH2 shows that only the latter are capable of catalysing this process under mild conditions.
A sol–gel reaction starting from Si and Zr alkoxides, in water–ethanol mixtures, was employed to obtain iron doped zirconium silicate powders (zircon). The speciation of the ferric salt to be added to the starting mixture was varied, the anion matching, in each case, the anionic partner of the acid catalysing the gel…