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Wyszukujesz frazę "González, B." wg kryterium: Autor

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    Wyświetlanie 1-14 z 14
    Tytuł:
    A convolution operation for a distributional Hankel transformation
    Autorzy:
    J. Betancor, J.
    González, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1288540.pdf
    Data publikacji:
    1995
    Wydawca:
    Polska Akademia Nauk. Instytut Matematyczny PAN
    Tematy:
    Hankel transformation
    convolution
    distributions
    Bessel functions
    Opis:
    We investigate the Hankel transformation and the Hankel convolution on new spaces of generalized functions.
    Źródło:
    Studia Mathematica; 1995-1996, 117, 1; 57-72
    0039-3223
    Pojawia się w:
    Studia Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Three-dimensional cfd analysis to study the thrust and efficiency of a biologicallyinspired marine propulsor
    Autorzy:
    Lamas, M. I.
    Rodríguez, J. D.
    Rodríguez, C. G.
    González, P. B.
    Powiązania:
    https://bibliotekanauki.pl/articles/259319.pdf
    Data publikacji:
    2011
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    fish swimming
    marine propulsion
    undulating fin
    biomimetic
    computational fluid dynamics (CFD)
    CFD
    Opis:
    Aquatic animals, which are the result of many millions of years of evolutionary optimization, are very quick, efficient, robust, and versatile. Accordingly, biologically-inspired mechanisms which emulate the movement of animals have recently become very popular. For the efficient design of a propulsion system it is very important to analyze the fluid flow in detail. CFD (Computational Fluid Dynamics) has become a powerful technique to understand the phenomena because it gives extensive information about the fluid flow characteristics. In the present work, a propulsion system consisting of an undulating fin which emulates the fish swimming was built. In order to optimize the mechanism, several undulating configurations were studied using a 3D turbulent CFD model. The thrust, drag, efficiency and hydrodynamic characteristics were analyzed. Furthermore, it was shown that the efficiency and thrust depend strongly on the oscillation frequency, amplitude and wavelength. In order to validate this CFD model, the numerically obtained thrust was successfully compared with experimental results from the laboratory mechanism.
    Źródło:
    Polish Maritime Research; 2011, 1; 10-16
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Monte Carlo Analysis of the Dynamic Behavior οf InAlAs/InGaAs Velocity Modulation Transistors: A Geometrical Optimization
    Autorzy:
    Vasallo, B.
    González, T.
    Pardo, D.
    Mateos, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1505612.pdf
    Data publikacji:
    2011-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    85.30.De
    85.30.Tv
    Opis:
    The influence of the geometry on the dynamic behavior of InAlAs/InGaAs velocity modulation transistors is analyzed by means of a Monte Carlo simulator in order to optimize the performance of this new type of transistor. In velocity modulation transistors, based on the topology of a double-gate high electron mobility transistor, the source and drain electrodes are connected by two channels with different mobilities, and electrons are transferred between both of them by changing the gate voltages in differential mode. Consequently, the drain current is modulated while keeping the total carrier density constant, thus in principle avoiding capacitance charging/discharging delays. However, the low values taken by the transconductance, as well as the high capacitance between the two gates in differential-mode operation, lead to a deficient dynamic performance. This behavior can be geometrically optimized by increasing the mobility difference between the two channels, by increasing the channel width and, mainly, by reducing the gate length, with a higher immunity to short channel effects than the traditional architectures.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 2; 193-195
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of road signs using radiometric and geometric data from terrestrial LiDAR
    Autorzy:
    Gonzalez-Jorge, H
    Riveiro, B.
    Armesto, J.
    Arias, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/173526.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    road inspection
    laser scanning
    radiance
    road sign
    Opis:
    Maintenance works are crucial to reduce the risk of accidents. Road signs appear to be one of the most important elements for safety purposes so their inspection is commonly included in the most extended road management systems. The geometric state of the sign is of great importance, especially interesting is its flatness and the inclination relative to the ground. Road signs are printed with reflective paints to maximize the visibility to the drivers. This coating produces a high reflected radiation that is easily recorded by the photoelectric detector of the laser scanner mechanisms. It allows establishing an intensity based filter in order to perform the 3D classification of the road sign. In this work, a number of road signs are evaluated, under a geometric point of view, using the laser scanner Riegl LMS Z390i. A Matlab algorithm is developed for all the data processing (3D classification and evaluation of geometric parameters). Results do not show the evidence of folded or abnormally tilted signs. The developed algorithms open the possibility of using the attribute of intensity of laser scanning data for classification purposes, during the automatic evaluation of the condition state of road signs. Such algorithms could increase the productivity and reliability of the inspection works.
    Źródło:
    Optica Applicata; 2013, 43, 3; 421-433
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Statistical Approach To Prediction Of The CMM Drift Behaviour Using A Calibrated Mechanical Artefact
    Autorzy:
    Cuesta, E.
    Alvarez, B.
    Sanchez-Lasheras, F.
    Gonzalez-Madruga, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/221090.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    multivariate regression models
    coordinate measuring machine
    drift behaviour
    calibration
    Opis:
    This paper presents a multivariate regression predictive model of drift on the Coordinate Measuring Machine (CMM) behaviour. Evaluation tests on a CMM with a multi-step gauge were carried out following an extended version of an ISO evaluation procedure with a periodicity of at least once a week and during more than five months. This test procedure consists in measuring the gauge for several range volumes, spatial locations, distances and repetitions. The procedure, environment conditions and even the gauge have been kept invariables, so a massive measurement dataset was collected over time under high repeatability conditions. A multivariate regression analysis has revealed the main parameters that could affect the CMM behaviour, and then detected a trend on the CMM performance drift. A performance model that considers both the size of the measured dimension and the elapsed time since the last CMM calibration has been developed. This model can predict the CMM performance and measurement reliability over time and also can estimate an optimized period between calibrations for a specific measurement length or accuracy level.
    Źródło:
    Metrology and Measurement Systems; 2015, 22, 3; 417-428
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Monte Carlo Analysis of Impact Ionization in Isolated-Gate InAs/AlSb High Electron Mobility Transistors
    Autorzy:
    Vasallo, B.
    Rodilla, H.
    González, T.
    Lefebvre, E.
    Moschetti, G.
    Grahn, J.
    Mateos, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1506159.pdf
    Data publikacji:
    2011-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    85.30.De
    85.30.Tv
    Opis:
    We perform a physical analysis of the kink effect in InAs/AlSb high electron mobility transistors by means of a semiclassical 2D ensemble Monte Carlo simulator. Due to the small bandgap of InAs, InAs/AlSb high electron mobility transistors are very susceptible to suffer from impact ionization processes, with the subsequent hole transport through the structure, both implicated in the kink effect. When the drain-to-source voltage $V_{DS}$ is high enough for the onset of impact ionization, holes generated tend to pile up at the gate-drain side of the buffer. This occurs due to the valence-band energy barrier between the buffer and the channel. Because of this accumulation of positive charge, the channel is further opened and the drain current $I_{D}$ increases, leading to the kink effect in the I-V characteristics.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 2; 222-224
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An Optimized Propagation Model based on Measurement Data for Indoor Environments
    Autorzy:
    Morocho-Yaguana, M.
    Ludeňa-González, P.
    Sandoval, F.
    Poma-Vélez, B.
    Erreyes-Dota, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/308451.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    indoor
    ITU model
    log-distance model
    loss measurement
    one-slope model
    path loss
    propagation measurements
    propagation models
    radio propagation
    Opis:
    Propagation is an essential factor ensuring good coverage of wireless communications systems. Propagation models are used to predict losses in the path between transmitter and receiver nodes. They are usually defined for general conditions. Therefore, their results are not always adapted to the behavior of real signals in a specific environment. The main goal of this work is to propose a new model adjusting the loss coefficients based on empirical data, which can be applied in an indoor university campus environment. The Oneslope, Log-distance and ITU models are described to provide a mathematical base. An extensive measurement campaign is performed based on a strict methodology considering different cases in typical indoor scenarios. New loss parameter values are defined to adjust the mathematical model to the behavior of real signals in the campus environment. The experimental results show that the model proposed offers an attenuation average error of 2.5% with respect to the losses measured. In addition, comparison of the proposed model with existing solutions shows that it decreases the average error significantly for all scenarios under evaluation.
    Źródło:
    Journal of Telecommunications and Information Technology; 2018, 2; 69-75
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Molecular aerobiology-Plantago allergen Pla l 1 in the atmosphere
    Autorzy:
    Gonzalez-Parrado, Z.
    Fernandez-Gonzalez, D.
    Camazon, B.
    Valencia-Barrera, R.M.
    Vega-Maray, A.M.
    Asturias, J.A.
    Monsalve, R.I.
    Mandrioli, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/50756.pdf
    Data publikacji:
    2014
    Wydawca:
    Instytut Medycyny Wsi
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2014, 21, 2
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Residual Strain and Electrical Activity of Defects in Multicrystalline Silicon Solar Cells
    Autorzy:
    Martínez, O.
    Mass, J.
    Tejero, A.
    Moralejo, B.
    Hortelano, V.
    González, M.
    Jiménez, J.
    Parra, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1198419.pdf
    Data publikacji:
    2014-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.30.Am
    61.72.Ff
    88.40.jj
    Opis:
    The growth process by casting methods of multi-crystalline Si results in a crystalline material with, among other defects, a high density of dislocations and grain boundaries. Impurity incorporation and their gathering around grain boundaries and dislocations seem to be the main factor determining the electrical activity of those defects, which limit the minority carrier lifetime. In this work, we analyze multi-crystalline Si samples by combining etching processes to reveal the defects, Raman spectroscopy for strain measurements, and light beam induced current measurements for the localization of electrically active defects. In particular, we have explored the etching routes capable to reveal the main defects (grain boundaries and dislocation lines), while their electrical activity is studied by the light beam induced current technique. We further analyze the strain levels around these defects by Raman micro-spectroscopy, aiming to obtain a more general picture of the correlation between residual stress and electrical activity of the extended defects. The higher stress levels are observed around intra-grain defects associated with dislocation lines, rather than around the grain boundaries. On the other hand, the intra-grain defects are also observed to give dark light beam induced current contrast associated with a higher electrical activity of these defects as compared to the grain boundaries.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 4; 1013-1016
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Vulnerabilidad socioeconomica y medioambiental: Valle de Cuautitlan-Texcoco, Estado de Mexico
    Socioeconomic and environmental vulnerability: Valle de Cuautitlan-Texcoco, State of Mexico
    Autorzy:
    Hernandez, M.E.O.
    Valdez Perez, M.E.
    Alvarez Arteaga, G.
    Gonzalez Guerrero, G.
    Garcia Fajardo, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/2077806.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Warszawski. Wydział Geografii i Studiów Regionalnych
    Źródło:
    Prace i Studia Geograficzne; 2019, 64, 2; 49-67
    0208-4589
    Pojawia się w:
    Prace i Studia Geograficzne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Template Assisted Deposition of Ferromagnetic Nanostructures: from Antidot Thin Films to Multisegmented Nanowires
    Autorzy:
    Prida, V.M.
    Salaheldeen, M.
    Pfitzer, G.
    Hidalgo, A.
    Vega, V.
    González, S.
    Teixeira, J.
    Fernández, A.
    Hernando, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032144.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Gw
    75.70.Kw
    75.75.-c
    75.70.-i
    75.70.Rf
    Opis:
    The growth of nanostructured materials by means of different deposition methods employing nanoporous anodic aluminum oxide membranes as patterned templates has been widely used during last years due to the outstanding features displayed by these nanoporous templates. Here we report on the synthesis, morphology and magnetic properties exhibited by novel magnetic 1D and 2D nanostructured materials having nanowire or antidot thin films geometry, respectively, together to that of geometrically diameter modulated ferromagnetic nanowires. Their magnetic properties will be analyzed and discussed based on the different anisotropic behavior derived from their morphological and microstructural features.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 822-827
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Properties and Giant Magnetoimpedance in Amorphous and Nanocrystalline Microwires
    Autorzy:
    Talaat, A.
    Zhukova, V.
    Ipatov, M.
    Blanco, J.
    Churyukanova, M.
    Kaloshkin, S.
    Kostitcyna, E.
    Shuvaeva, E.
    Gonzalez-Legarreta, L.
    Hernando, B.
    Zhukov, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1200823.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Tt
    75.30.Gw
    75.50.-y
    Opis:
    We studied magnetic properties and GMI effect of Finemet-type FeCuNbSiB microwires. We observed that GMI effect and magnetic softness of microwires produced by the Taylor-Ulitovski technique, can be tailored by either controlling magnetoelastic anisotropy of as-prepared FeCuNbSiB microwires or controlling their structure by heat treatment or changing the fabrication conditions. GMI effect has been observed in as-prepared Fe-rich microwires with nanocrystalline structure.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 146-147
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Elastic Properties of Zinc Blende MnTe
    Autorzy:
    Djemia, P.
    Roussigné, Y.
    Stashkevich, A.
    Szuszkiewicz, W.
    Gonzalez Szwacki, N.
    Dynowska, E.
    Janik, E.
    Kowalski, B. J.
    Karczewski, G.
    Bogusławski, P.
    Jouanne, M.
    Morhange, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2038250.pdf
    Data publikacji:
    2004-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    62.20.Dc
    75.50.Pp
    78.35.+c
    Opis:
    The Brillouin light scattering was used to investigate elastic properties of the zinc blende, MBE-grown MnTe layer that was deposited on a (001) GaAs substrate covered by CdTe buffer layer. The three elastic constants of the zinc blende MnTe, namely c$\text{}_{11}$, c$\text{}_{12}$, and c$\text{}_{44}$, were directly determined for the first time from the frequency of the Rayleigh mode, of the pseudo-surface mode, and of the shear horizontal bulk mode traveling parallel to the layer surface. The value of c$\text{}_{11}$ was checked using the frequency of longitudinal bulk waves propagating at different angles from the normal of the layer plane. This value was also independently determined by results of the folding of acoustic phonons, observed for MnTe/CdTe superlattices by the Raman scattering. Finally, the bulk modulus given by the formula B=(c$\text{}_{11}$+2c$\text{}_{12}$)/3 was determined for zinc blende MnTe by ab initio calculations making use of the density functional theory and atomic pseudopotentials; spin polarization of MnTe was taken into account. A satisfactory agreement between theoretical and experimental values was obtained.
    Źródło:
    Acta Physica Polonica A; 2004, 106, 2; 239-247
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-14 z 14

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