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Pomiary Automatyka Kontrola
2013 R. 59, nr 5 422--424
PL Artykuł dotyczy zagadnienia estymacji widma sygnałów periodycznych metodą DFT z dodatkowym przetwarzaniem – zastosowaniem okna oraz interpolacją dwu i trzy punktową. Przedstawiono zasadę takiej estymacji w przypadku okna prostokątnego i Hanninga oraz zanalizowano efektywność każdego z wariantów. Prz[...]
EN The paper deals with estimation of periodic signal spectra using the DFT method with additional processing (application of time window and two-point and three-point interpolation). The efficiency of esti-mation with the rectangular and Hanning window is analyzed. There is presented a program interfa[...]
2
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Diagnostyka
PL W artykule przedstawiono jedną z metod cyfrowego przetwarzania sygnałów diagnostycznych jaką jest analiza cepstralna i możliwość jej zastosowania w diagnostyce urządzeń mechanicznych do badania źródeł zaburzeń. Dla rozwiązania zadania przeprowadzono badania symulacyjne i diagnostyczne. Eksperyment s[...]
EN The paper presents one of the methods of digital processing of diagnostic signals such as cepstral analysis and the possibility of its application in the investigations of sources of wave disturbances. In order to solve the problem, simulation and diagnostic research was performed. The simulation ex[...]
3
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Mechanics and Mechanical Engineering
EN This work illustrates the significance of kinetic parameters of nucleation and thermal decomposition for Pyridine-2-carboxylic acid crystals. In the interest of maximizing the growth condition for the production of single crystals, nucleation parameters such as interfacial energy (σ), volume free en[...]
4
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Polish Journal of Chemistry
2009 Vol. 83, nr 12 2119-2127
EN Density functional theory (DFT) calculations have been carried out to study the structure and adsorption of HCO3 - species on Al2O3 catalyst using MPW1PW91 function and the different basis sets of 6-31G, 6-311G, 6-311+G(d), DGDZVP, DGDZVP2, PVQZ, SDD, LANL2DZ, LANL2MB. The geometrical structures and[...]
5
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Polish Journal of Chemistry
EN The reaction mechanism of NCO + NO was studied using density functional theory (DFT) method at 6-31G* level. Geometry optimization, vibrational frequency analysis, and kinetic and thermodynamic properties calculation were performed for reactants, transition state and products. These results indicate[...]
6
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Polish Journal of Chemistry
EN The substantial influence of floating Cp–Al bond-modes from ni 5(pi) to ni 1(omega) on the Cp– ligand’s aromaticity was discussed basing on the crystal data of organoaluminum complexes and DFT calculations (B3LYP/6-311G**) performed for model compounds. The aromaticity of cyclopentadienyl moiety wa[...]
7
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Polish Journal of Chemistry
EN The characterization of carbonyl–metal and maleimidato–metal bonding has been performed using the topological analysis of electron distribution function estimated for molecules of ( 5-C5H5)M(CO)3( 1-N-maleimidato) (M = W, Mo) and ( 5-C5H5)Fe(CO)2( 1-N-maleimidato). The Atoms in Molecules (AIM) appro[...]
8
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Polish Journal of Chemistry
EN We have examined charge distribution between exocyclic oxygen and sulfur atoms in 5,5-dimethyl-1,3,2-dioxaphosphorinan-2-oxy-2-thio monoanion. Our results indicate that while solvent polarity and substituents have minor effect, the presence of a counter- ion results in relative increase of the parti[...]
9
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Polish Journal of Chemistry
EN Atheoretical study of the complexes formed by the chiral -amino--phenylmethanol in the presence and absence of a chromium(0) atom has been carried out. The results indicate that in the presence of chromium, themost stable complex corresponds to that where the two amino(phenyl)-methanol molecules hav[...]
10
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TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk
EN A set of elastic constants was calculated and a parametrization of the potential was derived for simple cubic tungsten trioxide based on an analytical bond-order scheme. It was show that the obtained parametrization provided a good description of interatomic forces and such properties as the lattice[...]
11
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Polish Journal of Chemistry
EN Organometallic systems provide an exceptional tool in the stereoselective synthesis. The source of this selectivity, however, frequently remains a challenging question. In recent years, theoretical studies of mechanisms of organometallic and metalloprotein catalysis have received considerable attent[...]
12
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Polish Journal of Chemistry
2004 Vol. 78 / nr 9 1103-1119
EN Quantum calculations of interaction of the atomic hydrogen with metal (Pd, Ni, Ag, Cu) clusters with the structure of the fcc [100] surface have been performed. The calculations have been based on the gradient-corrected methods of the Density Functional Theory. For a given position (X,Y) of the hydr[...]
13
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Machine Graphics and Vision
EN We present a phenomenological parametric model for the spectrum of the discrete Fourier transform [DFT] of the images obtained from the Extreme UV Imaging Telescope [EIT] of the SOHO mission. As this spectrum decays very fast, we model its logarithm rather than the original spectrum. The proposed mo[...]
14
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Computer Applications in Electrical Engineering
2012 Vol. 10 29--40
15
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Bulletin of the Polish Academy of Sciences. Technical Sciences
EN A technique for pattern classification using the Fourier transform combined with the nearest neighbor classifier is proposed. The multidimensional fast Fourier transform (FFT) is applied to the patterns in the data base. Then the magnitudes of the Fourier coefficients are sorted in descending order [...]
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Archives of Metallurgy and Materials
EN Paper presents results of studies on structural, electronic and magnetic properties of YFe5 compound using density functional theory (DFT) approach. The GGA functional with ultrasoft pseudopotentials were used as implemented in Quantum Espresso software. The structure of YFe5 c[...]
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Pomiary Automatyka Kontrola
PL Artykuł opisuje aplikację metody koherentnego repróbkowania sygnałów energetycznych w stystemie z procesorem sygnałowym. Celem działania metody jest ograniczenie błędów estymacji częstotliwościowych parametrów sygnałów i systemu energetycznego, wynikających z rozmycia widma sygnałów. Rozmycie jest s[...]
EN The paper presents application f the power system signals coherent resampling method. The aim of coherent resampling is to decrease estimation errors of selected power system and signals spectral parameters. The reason of errors is DFT spectrum leakage caused by lack of synchronisation between sampl[...]
18
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Physicochemical Problems of Mineral Processing
EN The interaction between sphalerite and pyrite was investigated by dissolution test, X-ray photoelectron spectroscopy (XPS), zeta potential measurement and density functional theory (DFT) calculation. Dissolution tests indicated that sphalerite dissolution was promoted due to the galvanic interaction[...]
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Physicochemical Problems of Mineral Processing
EN A novel collector, tert-butyl benzohydroxamic acid (TBHA), was first introduced in rhodochrosite flotation. The performance of TBHA was investigated by the density functional theory (DFT) calculation along with the micro flotation test, zeta potential determination and XPS analysis, compared with be[...]
20
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Materials Science Poland
2018 Vol. 36, No. 3 409--418
EN A novel and low-cost synthesis of tungsten disulfide (WS2 ) transition metal dichalcogenide was carried out via gas-solid reaction in a horizontal quartz reactor. In this process, the prepared hollow WO3 precursor was sulfided with CS2 at 550 °C at different duration[...]
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