Materials Literature
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The catalytic activity of a mixture of ZnCl2: AlCl3 supported on silica gel was evaluated for the alkylation of phenols with benzyl alcohol, tret-butyl alcohol and styrene under microwave irradiation and solvent-free conditions. The catalyst preparation method, its characterization and reusability, were reported. The…
Many methods have been published for minimizing pulsating torque using programmed reference current waveforms (PRCW), however there are still several problems with their implementation. One major problem is the need to determine motor and controller parameters very accurately. The task of parameter determination is a…
Abstract The electrochemical grafting of ethynyl derivatives on Si(111) surfaces has been investigated by means of pulsed photoluminescence (PL) and surface photovoltage (SPV) techniques. Ethynyl derivatives (ethynyl‐MgCl, ethynyl‐MgBr, propynyl‐MgBr, and phenylethynyl‐MgBr) from Grignard compounds were used. By SPV,…
A model for the long awaited crystal structure of metastable NaAlF 4 is established from the powder diffraction pattern of a partly disproportionated sample. Orthorhombic, C m c m , a =3.6121(3), b =14.952(1), c =5.2692(4) Å, Z =4, V =284.58(4) Å 3 . Sodium atoms are in NaF6 trigonal prisms interconnected by edges in…
The paper presents streaming current distributions measured in an overflow system in both laminar and turbulent conditions. For lower values of Reynolds number the profile of current is parabolic. For higher values of Reynolds number the profile is flattened. In this paper also charge density distributions were determ…
The monofunctionalized cyclohexasilanes XSi6Me11 [X = -OH (2); -NH2 (3)] are easily accessible from XSi6Me11 and H2O/Et3N or NH3, respectively. The crystal structure of 2 as determined by single crystal X-ray crystallography exhibits the cyclohexasilane ring in chair conformation with the OH group in an unusual equato…
This paper presents a study of uniaxial die compaction of food powders for typical food powders such as maize powder and maize grits as well as a universal binder known as microcrystalline cellulose or Avicel. This method of compaction is widely applied in the industry as it can investigate the compressibility and com…
We have developed a novel kinetic Monte Carlo method, which simulates the epitaxial growth of oxide films with perovskite structure. First results are presented for two cases of adsorption dynamics for one of the metals — adsorption of single Ti atoms and adsorption of larger particles TiO2 and TiO . For both types of…
The structural features of a thin polar liquid film in an electric field of a charged substrate have been theoretically investigated using methods of statistical physics. It has been established that electrical interactions in this system lead to a change in the structure of the polar liquid and to the formation of cl…
Os impactos ambientais advindos da exploração e do beneficiamento de U são, em grande parte, idênticos àqueles causados por atividades minero-extrativistas em geral. Este trabalho teve o objetivo de determinar a partição geoquímica dos radionuclídeos naturais 238U, 226Ra e 210Pb em áreas circunvizinhas à Unidade de Mi…
Abstract Bifunctional silane [bis(triethoxysilylpropyl)disulfide (TESPD)] was added to a silica‐containing ethylene–propylene–diene terpolymer mold compound, and its effects with respect to the vulcanization properties, processability, and physical properties were investigated. The addition of TESPD caused reduced hea…
This paper describes a more precise technique for thermal analysis due to joule heat loss in switched reluctance motor with soft magnetic composite material (SMC) by two dimensional (2-D) coupled field finite element analysis. The finite element model is solved in tandem by a cascaded procedure comprising electromagne…
Analysis of the incommensurate magnetic structure that emerges for two coexisting types of the antisymmetric Dzyaloshinski-Moriya exchange interaction (the weakly ferromagnetic component of vector D along the tetragonal axis and the helicoidal component distributed in the tetragonal plane) is carried out for the first…
Octacyanopyrazinoporphyrazine was for first time synthesized by template tetramerization of tetracyanopyrazine, and its complexes with bivalent metals were prepared. The compounds obtained were characterized by MALDI-TOF mass spectral data, elemental analysis, IR, and electronic spectroscopy.
Abstract: Partial discharge (PD) measurement and recognition is a significant tool for potential failure diagnosis of the high-voltage equipment. This paper proposes the application of grey clustering approach (GCA) to recognize partial discharge patterns of the high-voltage equipment. The PD patterns are measured by…
The structure and properties of high-temperature austenitic steels intended for superheater tubes are analyzed. Widely used Kh18N10T (AISI 304) and Kh16N13M3 (AISI 316) steels are found not to ensure a stable austenitic structure and stable properties during long-term thermal holding under stresses. The hardening of a…
Polycrystalline ( Pb 1-x Sr x) TiO 3 (PST) (x = 0.25, 0.50) ceramics were synthesized by the solid-state reaction method. PST sintering temperatures ranged between 1050–1250°C. The samples were characterized by X-ray diffractometer (XRD) and scanning electron microscopy (SEM). The sintered pellets showed pure perovski…
Abstract In the last year an increasing interest in functional materials such as ferroelectric polymers and ceramics has been shown. For those materials viscous effects or electric polarizations cause hysteresis phenomena accompanied with possibly large remanent strains. This paper outlines aspects of the formulation…
A theoretical model is developed to predict the Coefficient of Thermal Expansion (CTE) and thermal mismatch stress of composites with staggered hard platelets in parallel alignment in a soft matrix. The theoretical predictions agree well with the Finite Element Method (FEM) simulations. The results show that different…
The first eleven vertical ionization energies of mono and diethynylfurans have been calculated using various electron propagator decouplings. Among all ethynylfurans, the pi-orbital interactions between ethynyl and furan moieties are found to be strongest in 2,5-diethynylfuran. Oxygen atom of the furan ring and carbon…