Materials Literature
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Several prediction models for internal corrosion of oil and gas pipelines have been developed. Some of the models are based on mechanistic modelling of the different processes involved, while other models are mainly based on empirical correlations with laboratory or field data. The models have very different approache…
An energetic model is used to calculate macroscopic magnetization behavior of thin Permalloy films. Therefore it is extended by magnetocrystalline anisotropy energy and domain classes that particularly represent magnetization rotation. Some model parameters can be related to coherent rotation of domain magnetizations.…
The field emission (FE) characteristics of boron nitride (BN) nanofilms grown on flat and roughened GaN substrates are investigated. A significant improvement is achieved by the BN nanocoating sample in contrast to a BN thick coating sample. In order to obtain a large field enhancement factor, H2 plasma treatment is e…
Raman scattering spectra of RbMnCl 3 are measured at room temperature under high hydrostatic pressure. The results are interpreted based on first principles lattice dynamics calculations. The experimental data obtained correlate with the calculations in the low frequency domain but disagree slightly in the region of h…
Polarization dependent near and extended x-ray absorption fine-structure (XANES and EXAFS), in combination with x-ray diffraction, has been used to study the structure of SrTiO3 (STO) ultra thin films grown on Si(001). For the in-plane direction (200), the x-ray diffraction data indicate that all films (from 40 to 200…
The increasing amount of post-consumer waste leads to a search for effective recycling methods. Compatibilisation of immiscible blends of polypropylene (PP) and polyethylene terephthalate (PET) represents one such novel approach that allows recycling of significant scrap materials without any need for separation steps…
Abstract A new model for the case of a superposition of a phase transformation and a microstructure transition from columnar plane front to equiaxed dendritic growth for peritectic alloys is presented. This model is applied to Fe–Ni alloys where a phase transition from γ to δ takes place when the solute content decrea…
The structure, electrical resistivity, thermopower, and magnetic susceptibility of titanium diselenide intercalated with nickel (N x TiSe 2 ) are studied systematically in the nickel concentration range x =0–0.5. In accordance with a model proposed earlier, strong hybridization of the Ni3 d /Ti3 d states is observed,…
This article describes three new methods for performing simple flame tests using cotton swabs. The first method uses a Bunsen burner and solid metal salts; the second method uses a Bunsen burner and 1 M aqueous solutions of metal salts; and the third method uses candles, rubbing alcohol, and solid metal salts. These m…
Abstract Metal-free phthalocyanines were prepared in good yields by heating phthalonitriles with hexamethyldisilazane, (NH4)2SO4, and DMF. Good yields of metal-free phthalocyanines involving peripherally substituted phthalocyanines were attained with a catalytic amount of hexamethyldisilazane. Naphthalocyanine was als…
Possible mechanisms of a number of magnetoplastic effects in magnetically disordered crystals are analyzed in the context of the chemical kinetics of reactions occurring in a system of structural defects upon plastic deformation. Particular attention is given to spin-dependent reactions between real-structure elements…
Microporous two‐phase AlN–SiC composites were prepared using Al 4 C 3 and either Si (N 2 atmosphere) or Si 3 N 4 (Ar atmosphere) as precursors. The reaction mechanisms of the two synthesis routes and the effect of processing conditions on reaction rate and the material microstructures were demonstrated. The exothermic…
Postirradiation annealing tests were performed to obtain the 133Xe diffusion coefficients in uranium dioxide (UO2) and mixed thorium-uranium dioxide [(Th-U)O2] fuels. Specimens were a single-grained UO2, a polycrystalline UO2, and a polycrystalline (Th-U)O2. The (Th-U)O2 specimen was a mixture of 35% ThO2 and 65% UO2.…
Bacterial uridine monophosphate (UMP) kinases are essential enzymes encoded by pyrH genes, and conditional-lethal or other pyrH mutants were analysed with respect to structure-function relationships. A set of thermosensitive pyrH mutants from Escherichia coli was generated and studied, along with already described pyr…
Electrical steel with a Si content up to 6.5 wt% is a good soft magnetic material, because the power losses are reduced through the increased electrical resistivity of the bulk material by the presence of alloying elements like Si and Al. Nevertheless, with the increasing of the alloying elements, the concentration of…
A new mechanism of the intraband carrier relaxation in quantum dots embedded into a heterostructure at a relatively large distance from its doped elements is proposed. The relaxation process is related to the coupling between the electronic subsystem of a quantum dot and surface plasmon-phonon excitations of the doped…
The relationship between yarn structure and abrasion resistance is studied. Yarn abrasion resistant properties are measured on a Shirley abrasion tester. A new yarn structural parameter, the average surface length (average segment length of a fiber on the yarn surface), is proposed. Experimental work determines the re…
Ultrathin SiO2 layers are of importance for the semiconductor industry. One of the techniques that can be used to determine the chemical composition and thickness of this type of layers is x-ray photoelectron spectroscopy (XPS). As shown by Seah and Spencer [Surf. Interface Anal. 33, 640 (2002)], it is not trivial to…
Hemidesmus indicus root in the form of suspension in water (10 mg/ml) containing 15.5 mM NaCl, 3 mM KCl and 12 mM glucose, when injected into the ligated jejunal sac (1 ml/sac) of rat, increased the absorption of water, Na(+) and K(+) (but not glucose) from the sac. This bioactivity was present in the water extract (5…
Dramatic improvements in the selective separation and purification of NO x in exhaust gases by an electrochemical reactor have been achieved. The novel electrochemical cells for NO x decomposition were developed by nano‐scale control of penetrating pores from the catalytic electrode surface to the bottom of the cataly…