Materials Literature
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The aim of this work is to investigate the performance of Internal Reforming Solid Oxide Fuel Cell (IRSOFC) and Gas Turbine (GT) combined cycles. To study complex systems involving IRSOFC a mathematical model has been developed that simulates the fuel cell steady-state operation. The model, tested with data available…
This paper investigates the thermodynamic potential of the integrated Solid Oxide Fuel Cell - Gas Turbine technology for medium and large scale electric power production. After detailed description of the adopted calculation model, the performances of a variety of plant configurations are presented. The obtained resul…
Reaction of long-chain alkyl-substituted pyrazoles with AuCl(SMe 2 ) yields trinuclear gold(I) pyrazolate complexes, two of which exhibit monotropic mesophases. Optical microscopy and/or X-ray diffraction studies show that these compounds form hexagonal columnar mesophases. They are only the third examples of discotic…
Lattice mismatch in layered semiconductor structures with submicron length scales leads to extremely high nonuniform strains. This paper presents a finite element technique for incorporating the effects of the nonuniform strain into an analysis of the electronic properties of SiGe quantum structures. Strain fields are…
We present a simple, general energy functional for ferromagnetic materials based upon a local spin density extension to the Stoner theory of itinerant ferromagnetism. The functional reproduces well available ab initio results and experimental interfacial energies for grain boundaries in iron. The model shows that inte…
Following on the success of the recent application of holographic LEED to the determination of the 3D atomic geometry of Si adatoms on a SiC(111) p(3x3) surface, which enabled that structure to be solved, we show in this paper that a similar technique allows the direct recovery of the local geometry of adsorbates form…
<abstract language="eng">We describe in this work a simple experimental set up to perform time dependent luminescence experiments in time scales from mili-seconds to seconds, based on the phase resolution of the emission signal. This system is composed by modulation of a continuous light source with an external…
The uniqueness of determining the optical parameters of a thin film deposited upon a massive substrate from the amplitude reflection coefficient is established. The film and substrate materials are assumed to be dispersive and absorbing. The proof is performed under the assumption that the dielectric functions of the…
Hydrophilic PVC composite films were obtained by "in situ" polymerization of acrylic acid which was introduced in the matrix by two different methods, based on diffusion phenomena: a successive or simultaneous diffusion of the swelling solvent (containing or not an initiator) and monomer into the film. The highest con…
Abstract Various techniques have been developed for domain refinement and loss reduction of high permeability grain oriented electrical steel. A ball unit system has been devised by European Electrical Steels (EES) and three methods were considered suitable for commercial application of the system- circulatory, recipr…
Poly(1,4-dioxan-2-one-co-trimethylene carbonate), P(DON-co-TMC), copolymers with different compositions were synthesized by copolymerizations of 1,4-dioxan-2-one (DON) and trimethylene carbonate (TMC) at 120°C in the presence of Sn(Oct)2. Their structures and compositions were determined with FT-IR and 1H-NMR spectros…
Spectral and kinetic properties of triplet excitons in thin films of glassy benzophenone were studied at temperatures between 4.2 and 220 K. The influence of the film thickness on the lifetime and nature of their phosphorescence decay was observed and discussed. It was shown that studies of spectral diffusion in thin…
We have measured the photoluminescence spectra of nanometric scale X1-Y2SiO5:Eux. The spectra were recorded at 15K and room temperature using site selective excitation by a dye laser in addition to conventional UV excitation. We found that at low temperature there is a pronounced excitation transfer from site 2→1. The…
In order to introduce a monomer into a PVC matrix, the swelling behavior of PVC films was tested in four solvents (acetone, methyl ethyl ketone, benzene, and toluene) and in acrylic acid solutions in acetone (10, 25 and 50 wt.-%) containing 0.1 wt.-% azoisobutyronitrile. The type of transport, diffusion and permeation…
The formation and decay of cyclic oligomers during hydrolytic polymerization, cationic polymerization, and autocatalytic polymerization of 6-hyxanelactam carried out at 260°C was followed by means of the high performance liquid chromatography (HPLC) analysis of portions extracted with methanol from the polymerization…
The purity is one of the key issues in the development of low-activation ferritic steels for fusion applications to reduce the concentration of highly radioactive elements. In this work a high-purity Fe–9Cr alloy and impurity-doped alloys were prepared from an ultra-high-purity iron and high-purity elements using an a…
Magnetization reversal process in Fe 15 Co 20 Ni 65 /Cr or Cu/Fe 15 Co 20 Ni 65 sandwiches having magnetic layers with mutually perpendicular easy magnetization axes or different value of coercive force has been studied. Dependences of hysteresis properties on interlayer thickness (L int ) for the sandwiches were meas…
The parameter Δλ/ΔM is a useful tool for investigating the magnetization process in magnetostrictive materials. This work extends the use of this parameter from that previously explored in the 〈100〉 and 〈111〉 easy regimes to the 〈110〉 easy regime. Theoretical values of Δλ/ΔM are presented for all possible domain wall…
The problem of finding an approximate theoretical description of the electrically induced Fréedericksz transition in droplets of a nematic liquid crystal (NLC) with a bipolar structure is solved for the case of a finite azimuthal energy of surface anchoring due to the interaction of the surface layer of the NLC with t…
Extended x-ray absorption fine structure measurements of the Fe K, and Pr and Er LIII absorption edges, were carried out to elucidate the relationship between the local structure and magnetism in Al substituted, partially nitrogenated (Er0.5Pr0.5)2Fe17 permanent magnets. We find that the nitrogenation acts to dilate b…