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Wyświetlanie 1-15 z 35
Tytuł:
Towards a Non-conformable Fractional Calculus of n-Variables
Autorzy:
Martínez, Francisco
Nápoles, Juan E. Valdés
Powiązania:
https://bibliotekanauki.pl/articles/1818655.pdf
Data publikacji:
2020
Wydawca:
Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
Tematy:
function of several variables
fractional partial differential operators
funkcje wielu zmiennych
operatory różniczkowe
operatory cząsteczkowe
operatory ułamkowe
Opis:
In this paper we present an extension of the non-conformable local fractional derivative, to the case of functions of severalvariables. Results analogous to those known from the classic multivariatecalculus are presented. To show the strength of this approach, we show anextension of the Second Lyapunov Method to the non-conformable localfractional case.
Źródło:
Journal of Mathematics and Applications; 2020, 43; 87--98
1733-6775
2300-9926
Pojawia się w:
Journal of Mathematics and Applications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure, Morphology and Electrical Properties of CaTiO3 Ceramics Synthesized by the Solid-State Reaction Method
Autorzy:
Rocha-Rangel, E.
López-Hernández, J.
Castillo-Martínez, J. A.
Osorio-Ramos, J. J.
Calles-Arriaga, C. A.
Estrada-Guel, I.
Martínez-Sánchez, R.
Powiązania:
https://bibliotekanauki.pl/articles/352238.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
CaTiO3
solid state synthesis
electrical properties
insulating ceramics
Opis:
In this paper, explain the preparation of CaTiO3 ceramics synthesized by the solid-state reaction method. Calcium carbonate and titanium dioxide were high energy mixed in stoichiometric amounts, and the obtained mixture was calcined at different temperatures (800, 900, 1000 and 1300ºC) for 2h. The obtained samples were characterized by measurement of particle size, Energy Dispersive X-Ray (EDX) Analysis; differential thermal analysis, X-ray diffraction and SEM images. XRD patterns indicated that CaTiO3 ceramics with the structure of perovskite is obtained from calcined powders at 1,300°C for 2h. SEM images show the formation of a very fine and homogeneous morphology. The measured values of electrical resistivity were within the typical range of insulating materials and approach values corresponding to insulating ceramics.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 4; 1749-1753
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spectrally tunable light source based on light-emitting diodes for custom lighting solutions
Autorzy:
Burgos-Fernandez, F. J.
Vilaseca, M.
Perales, E.
Herrera-Ramirez, J. A.
Martinez-Verdu, F. M.
Pujol, J.
Powiązania:
https://bibliotekanauki.pl/articles/173803.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
solid state lighting
light-emitting diodes
CIE standard illuminants
minimization algorithm
customized lighting design
radiometry
Opis:
This study describes a novel spectral LED-based tunable light source used for customized lighting solutions, especially for the reconstruction of CIE (Commission Internationale de l'Eclairage) standard illuminants. The light source comprises 31 spectral bands ranging from 400 to 700 nm, an integrating cube and a control board with a 16-bit resolution. A minimization algorithm to calculate the weighting values for each channel was applied to reproduce illuminants with precision. The differences in spectral fitting and colorimetric parameters showed that the reconstructed spectra were comparable to the standard, especially for the D65, D50, A and E illuminants. Accurate results were also obtained for illuminants with narrow peaks such as fluorescents (F2 and F11) and a high-pressure sodium lamp (HP1). In conclusion, the developed spectral LED-based light source and the minimization algorithm are able to reproduce any CIE standard illuminants with a high spectral and colorimetric accuracy able to advance available custom lighting systems useful in the industry and other fields such as museum lighting.
Źródło:
Optica Applicata; 2016, 46, 1; 117-129
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Solar generation estimation in electric power systems for prospective frequency control studies
Autorzy:
Martínez-García, A. A.
Torres-Breffe, O. E.
Vilaragut-Llanes, M.
Delgado-Fernandez, O.
Szpytko, J.
Salgado-Duarte, Y.
Powiązania:
https://bibliotekanauki.pl/articles/2172499.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
green shipping
solar power
electric power systems
energy storage systems
photovoltaic power generation
cuban electrical system
energy sources
photo voltage solar generation
Opis:
Increasing the presence of non-conventional clean energy sources in Electrical Power Systems (EPS) is a global strategic goal. Particularly, photovoltaic systems are attractive due to their versatility, low maintenance cost, easy installation, noiselessness, etc. However, the integration of photovoltaic systems into EPS increases the necessary regulation actions performed by system generators due to stochastic fluctuations of solar radiation, especially on cloudy days. Even using complex models that consider many variables, solar irradiation and its corresponding photovoltaic power generation are difficult variables to forecast with accuracy in cloudy day scenarios. To address this problem, Energy Storage Systems (BESS) have been proposed as a solution to mitigate the variability of photovoltaic generation, which reduce the need to use traditional spinning reserves and provide auxiliary grid services. The BESS selection required to mitigate photovoltaic generation is directly related to the worst-case daily variability of photovoltaic generation in the short term. This paper proposes a practical estimation of daily perspective photo voltage solar generation curve in Electrical Power Systems.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2022, 16, 2; 211--217
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Scale effects on sediment yield from badland areas in Mediterranean environments
Autorzy:
Martínez-Murillo, J. F.
Nadal-Romero, E.
Vanmaercke, M.
Poesen, J.
Powiązania:
https://bibliotekanauki.pl/articles/294681.pdf
Data publikacji:
2011
Wydawca:
Stowarzyszenie Geomorfologów Polskich
Tematy:
badlands
sediment yield
drainage area
spatial scale
Opis:
This study investigates area-specific Sediment Yield (SY) in Mediterranean badland areas at different spatial scales using a SY-database compiled from scientific literature. Relationships between the plot and catchment characteristics and the corresponding SY-data are analyzed. Results indicate that in Mediterranean environments SY is larger than in other environments,especially in badlands where a high variability of SY is observed depending on the spatial scale. In intensively gullied badlands,a complex plot or drainage area (A) -SY relationship is observed: for A ranging between 10-5 and 10 ha,SY is very high (mean SY equals 475 t ha-1 yr-1),whereas for A greater than 10 ha,SY decreases with increasing A (mean SY less than 100 t ha-1 yr-1).
Źródło:
Landform Analysis; 2011, 17; 105-109
1429-799X
Pojawia się w:
Landform Analysis
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Raman Study of Multicrystalline Silicon Wafers Produced by the RST Process
Autorzy:
Tejero, A.
Tupin, E.
González, M.
Martínez, O.
Jiménez, J.
Belouet, C.
Baillis, C.
Powiązania:
https://bibliotekanauki.pl/articles/1198416.pdf
Data publikacji:
2014-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.30.Am
61.72.Ff
88.40.jj
Opis:
In the silicon ribbon on a sacrificial template process silicon is deposited on both sides of a carbon ribbon, thus forming a Si/carbon/Si trilayer. The fast cooling of the ribbon in large temperature gradients generates stresses that are detrimental to both the electrical performance and the mechanical behaviour of the wafers. The assessment of the stresses is crucial for the setting-up of thermal treatments allowing for the stress relaxation of the wafers, prior to the cell fabrication. We present an analysis of the stress in the as-grown trilayer by a simulation of the thermomechanical behaviour of the cooling ribbon. Experimental measurements of the stress in as-grown and annealed trilayers are also presented. The results permit to establish the conditions for optimized growth and annealing.
Źródło:
Acta Physica Polonica A; 2014, 125, 4; 1006-1009
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Physical and chemical characterization of masa and tortillas from parental lines, crosses, and one hybrid
Autorzy:
Valderrama-Bravo, C.
Dominguez-Pacheco, A.
Hernandez-Aguilar, C.
Zepeda-Bautista, R.
del Real-Lopez, A.
Pahua-Ramos, M.E.
Arellano-Vazquez, J.L.
Moreno-Martinez, E.
Powiązania:
https://bibliotekanauki.pl/articles/24739.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Opis:
In maize plant breeding aimed at producing a hybrid, it is necessary to characterize the parents and hybrids by their agronomic aspects and grain quality so that the processing industry may offer consumers a quality product and also improve its efficiency. This study evaluated the viscoelastic parameters of masa and the chemical and texture properties of tortillas obtained from parent lines (M-54, M55, and CML-242), two single crosses (M54xM55 and M55xM54), and one hybrid (H-70). The morpho- logy of the maize grains and tortillas was analyzed using scanning electron microscopy. The firmness of masa obtained from CML-242 and H-70 maize was higher than that from the other maize genotypes. M-54 tortillas showed the lowest crude fiber content. Otherwise, tortillas obtained from the M55xM54 hard grain had the lowest fat content and extensibility, while H-70 tortillas showed an intermediate breaking point and extensibility. M-54 and M54xM55 tortillas were softer due to their more swollen starch granules. In contrast, rigid tortillas were obtained from CML-242 and H-70. Grain hardness causes different morphology in starch and tortilla of maize genotypes. However, grain hardness did not influence the characteristics of texture in tortillas.
Źródło:
International Agrophysics; 2017, 31, 1
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Participation of interferon type I during canine parvovirus infection
Autorzy:
Reyes-Cruz, T.
Martínez-Gómez, D.
Verdugo-Rodríguez, A.
Bustos-Martínez, J.
López-Islas, J.
Méndez-Olvera, E.T.
Powiązania:
https://bibliotekanauki.pl/articles/2087108.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
canine parvovirus
antiviral immunity
IFNβ
viral pathogenesis
Źródło:
Polish Journal of Veterinary Sciences; 2021, 24, 3; 375-384
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of convolutional neural networks using the fuzzy gravitational search algorithm
Autorzy:
Poma, Yutzil
Melin, Patricia
González, Claudia I.
Martínez, Gabriela E.
Powiązania:
https://bibliotekanauki.pl/articles/384794.pdf
Data publikacji:
2020
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
neural networks
convolutional neural network
fuzzy gravitational search algorithm
deep learning
Opis:
This paper presents an approach to optimize a Convolutional Neural Network using the Fuzzy Gravitational Search Algorithm. The optimized parameters are the number of images per block that are used in the training phase, the number of filters and the filter size of the convolutional layer. The reason for optimizing these parameters is because they have a great impact on performance of the Convolutional Neural Networks. The neural network model presented in this work can be applied for any image recognition or classification applications; nevertheless, in this paper, the experiments are performed in the ORL and Cropped Yale databases. The results are compared with other neural networks, such as modular and monolithic neural networks. In addition, the experiments were performed manually, and the results were obtained (when the neural network is not optimized), and comparison was made with the optimized results to validate the advantage of using the Fuzzy Gravitational Search Algorithm.
Źródło:
Journal of Automation Mobile Robotics and Intelligent Systems; 2020, 14, 1; 109-120
1897-8649
2080-2145
Pojawia się w:
Journal of Automation Mobile Robotics and Intelligent Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Methods of delineating wellhead protection areas in granular porous aquifers. results for an aquifer in the Duero River Basin (Spain)
Autorzy:
Martínez-Alfaro, P, E.
Martínez-Navarrete, C.
García-García, Á.
Powiązania:
https://bibliotekanauki.pl/articles/1185827.pdf
Data publikacji:
2005
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
tereny ochrony wód podziemnych
zanieczyszczenie wód podziemnych
metody analityczne
modele matematyczne
czas przepływu wód podziemnych
source protection areas
groundwater pollution
analytic methods
mathematic models
travel time
Opis:
Ochrona wód podziemnych przeznaczonych do picia ma największe znaczenie w Europie. Jest ona organizowana głównie przez ustanawianie obszarów ochrony formowania się zasobów wód podziemnych. W artykule przeanalizowano 12 wybranych metod oceny czasu przepływu wód podziemnych dla t = 1 dzień, 50 dni, 4 lata i 25 lat w porowym ośrodku skalnym, porównując wyniki obliczeń wykonanych dla 4 ujęć znajdujących się w zlewni rzeki Duero w północno-zachodniej Hiszpanii. Oceniono również wyniki uzyskane innymi metodami, które nie pozwalają na ocenę czasu przepływu wody. Wyniki matematycznej symulacji przepływu z wykorzystaniem programów VisualMODFLOW i VisualMODPATH posłużyły jako odniesienie do kartograficznego odwzorowania obszarów ochronnych. Wyniki badań wykonanych różnymi metodami wskazują, że małe błędy występują przy ocenie zasięgu przepływu wód dla czasu od 1 do 50 dni, lecz wyraźnie zwiększają się przy dalszych zasięgach przepływu, zwykle dla czasu wynoszącego ponad kilka lat. Przeprowadzone analizy pozwalają ocenić różnice między stosowanymi metodami obliczeń i określić ich dokładność dla różnych warunków hydrogeologicznych, co umożliwia wybór najwłaściwszej metody badań dla dowolnego obszaru o podobnej charakterystyce.
Źródło:
Polish Geological Institute Special Papers; 2005, 18; 62-70
1507-9791
Pojawia się w:
Polish Geological Institute Special Papers
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mentoring Student Training, what Is Important?
Autorzy:
Raposo-Rivas, M.
Martinez-Figueira, E.
Powiązania:
https://bibliotekanauki.pl/articles/26182733.pdf
Data publikacji:
2013-06-30
Wydawca:
Wydawnictwo Adam Marszałek
Tematy:
mentor
mentoring
student training
education
professional profile
professional competence
Opis:
Numerous activities and tasks are performed in the course of the tutorial during student training, but not all have the same importance for the tutor. We approach this answer through a wider investigation (Martinez, 2010) conducted in two phases: an initial qualitative one using an interview as a tool for obtaining information, and a second one more quantitative with an electronic questionnaire. The results show the importance that tutors attribute to “being available for students”, “integration into the center” and “providing contextual knowledge and access to documentation of the institution”.
Źródło:
The New Educational Review; 2013, 32; 243-254
1732-6729
Pojawia się w:
The New Educational Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mentoring Student Training: What Do Mentors Do?
Autorzy:
Martínez-Figueira, E.
Raposo-Rivas, M.
Powiązania:
https://bibliotekanauki.pl/articles/2031772.pdf
Data publikacji:
2014-09-30
Wydawca:
Wydawnictwo Adam Marszałek
Tematy:
mentor
mentoring
teaching practice
student learning
Opis:
In this paper we look into the role of mentors in student training given it is of paramount importance and at times both unknown and undefined. We studied this issue through research conducted in three Spanish universities using Creswell’s biphasic model along with sequential data triangulation. We obtained information by interviewing mentors and applying an electronic questionnaire. The results show that basically mentors are available for students in student training, facilitate their integration in the center. The study indicates that conceptualizing and operationalizing mentoring functions is difficult, however, they set up a reference for the development of student training.
Źródło:
The New Educational Review; 2014, 37; 188-201
1732-6729
Pojawia się w:
The New Educational Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measurements of Concentration differences between Liquid Mixtures using Digital Holographic Interferometry
Autorzy:
Guerrero-Méndez, C.
Saucedo-Anaya, T.
Araiza-Esquivel, M.
Balderas-Navarro, R. E.
López-Martínez, A.
Olvera-Olvera, C.
Powiązania:
https://bibliotekanauki.pl/articles/221594.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Digital Holographic Interferometry
refractive index measurements
phase difference
full-field measurements
Opis:
We present an alternative method to detect and measure the concentration changes in liquid solutions. The method uses Digital Holographic Interferometry (DHI) and is based on measuring refractive index variations. The first hologram is recorded when a wavefront from light comes across an ordinary cylindrical glass container filled with a liquid solution. The second hologram is recorded after slight changing the liquid’s concentration. Differences in phase obtained from the correlation of the first hologram with the second one provide information about the refractive index variation, which is directly related to the changes in physical properties related to the concentration. The method can be used − with high sensitivity, accuracy, and speed − either to detect adulterations or to measure a slight change of concentration in the order of 0.001 moles which is equivalent to a difference of 0.003 g of sodium chloride in solutions. The method also enables to measure and calculate the phase difference among each pixel of two samples. This makes it possible to generate a global measurement of the phase difference of the entire sensed region.
Źródło:
Metrology and Measurement Systems; 2017, 24, 1; 19-26
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Integrated stratigraphy of the Oxfordian global stratotype section and point (GSSP) candidate in the Subalpine Basin (SE France)
Autorzy:
Pellenard, P.
Fortwengler, D.
Marchand, D.
Thierry, J.
Bartolini, A.
Boulila, S.
Collin, P.
Enay, R.
Galbrun, B.
Gardin, S.
Huault, V.
Huret, E.
Martinez, M.
Smith, C.
Powiązania:
https://bibliotekanauki.pl/articles/2061042.pdf
Data publikacji:
2014
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Callovian-Oxfordian boundary
biostratigraphy
ammonites
dinoflagellate cysts
calcareous nannofossils
cyclostratigraphy
chemostratigraphy
biostratygrafia
amonity
cyklostratygrafia
Opis:
An integrated biostratigraphic approach, based on ammonites, calcareous nannofossils, dinoflagellates, combined with sedimentology, carbon-isotope and physical stratigraphy, is proposed for the Subalpine Basin (Thuoux and Saint-Pierre d’Argençon sections). Within the expanded marl deposits of the Terres Noires Fm., the Callovian-Oxfordian boundary is particularly well defined by ammonite taxa from different families (i.e. Cardioceratidae, Oppeliidae, Aspidoceratidae and Perisphinctidae), calcareous nannoplankton (first occurrence of large-sized Stephanolithion bigotii) and dinoflagellate cysts (first occurrence of Wanaea fimbriata). This precise biostratigraphy and diversity of ammonites permit long-range correlations with Boreal and Pacific domains. The exceptional outcrop conditions and continuous sedimentation allow high-resolution chemostratigraphy and cyclostratigraphy to be used. Variations of the δ13C record (1.5‰ increase during the Lamberti Zone), consistent with data from other sections of the Subalpine Basin and with the Paris Basin, provide additional markers to characterise the Callovian-Oxfordian boundary. Promising results from cyclostratigraphy should serve to constrain the duration of biostratigraphic units and thus improve the Late Jurassic Geologic Time Scale. Comparisons are made with the two other candidates for an Oxfordian GSSP, Redcliff Point (UK) and Dubki (Russian Platform). Finally, the advantages of the Subalpine Basin sections support the proposal of Thuoux as a suitable GSSP candidate for the base of the Oxfordian Stage
Źródło:
Volumina Jurassica; 2014, 12, 1; 1--44
1896-7876
1731-3708
Pojawia się w:
Volumina Jurassica
Dostawca treści:
Biblioteka Nauki
Artykuł
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