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Wyszukujesz frazę "López, J. F." wg kryterium: Autor

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    Wyświetlanie 1-14 z 14
    Tytuł:
    Engine diagnosis based on vibration analysis using different fuel blends
    Autorzy:
    Grajales, J. A.
    Quintero, H. F.
    López, J. F.
    Romero, C. A.
    Henao, E.
    Cardona, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/328420.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
    Tematy:
    engine diagnosis
    vibration analysis
    frequency analysis
    diagnostyka silnika
    analiza drgań
    analiza częstotliwościowa
    Opis:
    Fault diagnosis of an internal combustion engine is proposed herein by means of vibration analysis and a comparative analysis of normal operation and induced misfire scenarios. In order to validate previous works on misfire with pure gasoline, measurements also included tests performed with ethanol-gasoline fuel blends. According to results, changes in the fuel mix seem to have little impact on the performance and behaviour of the engine. And additionally, the particular frequency components that allowed differentiation between normal and faulty conditions were also present on all the fuel blends tested. Fast Fourier Transform was applied to obtain the frequency domain of the signal as a previous step to the subsequent identification process based on statistical characteristics extraction. A fuel blend classification method based on the analysis of the vibration signals of the engine was studied using envelope, Spike Energy and Peak Value techniques. Differentiation was possible with the extraction of the statistical features of the Peak Value spectrum of the longitudinal acceleration with a specific filter selection.
    Źródło:
    Diagnostyka; 2017, 18, 4; 27-36
    1641-6414
    2449-5220
    Pojawia się w:
    Diagnostyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Artificial Intelligence Approaches to Fault Diagnosis for Dynamic Systems
    Autorzy:
    Patton, R. J.
    Lopez-Toribio, C. J.
    Uppal, F. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/908290.pdf
    Data publikacji:
    1999
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    metoda sztucznej inteligencji
    rozpoznanie błędu
    modelowanie rozmyte
    system rozmyty
    artificial intelligence methods
    fault diagnosis
    residual generation
    fuzzy modelling
    neuro-fuzzy systems
    Opis:
    Recent approaches to fault detection and isolation (FDI) for dynamic systems using methods of integrating quantitative and qualitative model information, based upon artificial intelligence (AI) techniques are surveyed. In this study, the use of AI methods is considered an important extension to the quantitative model-based approach for residual generation in FDI. When quantitative models are not readily available, a correctly trained artificial neural network (ANN) can be used as a non-linear dynamic model of the system. However, the neural network does not easily provide insight into model behaviour; the model is explicit rather than implicit in form. This main difficulty can be overcome using qualitative modelling or rule-based inference methods. For example, fuzzy logic can be used together with state-space models or neural networks to enhance FDI diagnostic reasoning capabilities. The paper discusses the properties of several methods of combining quantitative and qualitative system information and their practical value for fault diagnosis of real process systems.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 1999, 9, 3; 471-518
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling the effects of land use changes on runoff and soil erosion in two Mediterranean catchments with active gullies (South of Spain)
    Autorzy:
    Martínez-Murillo, J. F.
    López-Vicente, M.
    Poesen, J.
    Ruiz-Sinoga, J. D.
    Powiązania:
    https://bibliotekanauki.pl/articles/294673.pdf
    Data publikacji:
    2011
    Wydawca:
    Stowarzyszenie Geomorfologów Polskich
    Tematy:
    gully erosion
    land use
    RMMF
    model
    runoff
    soil erosion
    Opis:
    This study investigates the effects of land use changes between 1956 and 2006 on runoff and soil erosion in two Mediterranean catchments (South Spain)with active gullies, by applying the RMMF Model and by comparing the erosion channel network from both years. Results underline the complexity of soil erosion dynamics in gullied catchments where a general increase in soil erosion due to land use changes can occur simultaneously with a decrease in erosion rates within the gully system.
    Źródło:
    Landform Analysis; 2011, 17; 99-104
    1429-799X
    Pojawia się w:
    Landform Analysis
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A posteriori error estimates for beams with inexact flexural stiffness representation
    Autorzy:
    Torii, André J.
    Gracite, Paula M.A.
    Miguel, Leandro F.F.
    Lopez, Rafael H.
    Powiązania:
    https://bibliotekanauki.pl/articles/24201505.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
    Tematy:
    beam
    error estimate
    inexact stiffness
    belka
    oszacowanie błędów
    Opis:
    In this work, we present a posteriori error estimates for the Euler-Bernoulli beam theory with inexact flexural stiffness representation. This is an important subject in practice because beams with non-uniform flexural stiffness are frequently modeled using a mesh of elements with constant stiffness. The error estimates obtained in this work are validated by means of two numerical examples. The estimates presented here can be employed for adaptive mesh refinement.
    Źródło:
    Journal of Applied Mathematics and Computational Mechanics; 2023, 22, 2; 62--74
    2299-9965
    Pojawia się w:
    Journal of Applied Mathematics and Computational Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Using tags in an AIML-based chatterbot to improve its knowledge
    Autorzy:
    Mikic, F. A.
    Burguillo, J. C.
    Peleteiro, A.
    Rey-Lopez, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/305303.pdf
    Data publikacji:
    2012
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    AIML
    chatterbots
    folksonomies
    tagging
    natural language
    Opis:
    Nowadays, it is common to find on the Internet different conversational robots which interact with users simulating a natural language conversation. Among them, we can emphasize the chatterbots based on AIML language. In this paper we present an AIML based chatterbot that shows as its main contribution the use of tags and folksonomies. Thanks to its use, we can generate a context for each conversation, being able to maintain a state for each user in the system, and improving the adaptation capabilities of the bot.
    Źródło:
    Computer Science; 2012, 13 (2); 123-133
    1508-2806
    2300-7036
    Pojawia się w:
    Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Importance of Internet And Online Social Networks in the Spanish Hotel Sector
    Autorzy:
    Infante-Moro, A.
    Infante-Moro, J-C.
    Martínez-López, F-J.
    García-Ordaz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/118135.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Promocji Wiedzy
    Tematy:
    hotels
    online social networks
    internet
    e-commerce
    cross-sectional study
    Opis:
    This paper is a cross-sectional study on the use of Internet and Online Social Networks in the Spanish hotel sector compared to Spanish companies in other sectors. The conclusions from this extensive survey are that the use of online social networks is more important and is more developed in the hotel sector than in Spanish companies in general. However, although it gives considerable importance to online social networks, the hotel sector needs to revise its rules of usage. The use of new tools such as e-commerce to sell the hotel stays must increase, and marketing efforts should be geared more towards online social networks because the hotel sector is currently losing ground in a market that generates more and more potential clients and sales by the day.
    Źródło:
    Applied Computer Science; 2016, 12, 1; 75-86
    1895-3735
    Pojawia się w:
    Applied Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characterization of sub-channel based Málaga atmospheric optical links with real β parameter
    Autorzy:
    López-González, F. J.
    Jurado-Navas, A.
    Garrido-Balsells, J. M.
    Castillo-Vázquez, M.
    Puerta-Notario, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/174807.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    Malaga distribution
    generalized-K distribution
    atmospheric optical communications
    atmospheric propagation
    atmospheric turbulence
    scintillation
    Opis:
    A generalization of the Málaga atmospheric optical communications links treated as a finite number of generalized-K distributed sub-channels is analyzed in terms of outage probability and outage rate when its β parameter belongs to the set of real numbers. To the best of the author’s knowledge, this is the first time that β ∈ ℜ is considered. The new analytical expressions derived in this paper lead to a new physical and more realistic interpretation of atmospheric optical links, especially in terms of performance.
    Źródło:
    Optica Applicata; 2017, 47, 4; 545-556
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Robust sensor fault estimation for descriptor-LPV systems with unmeasurable gain scheduling functions: Application to an anaerobic bioreactor
    Autorzy:
    López-Estrada, F. R.
    Ponsart, J. C.
    Theilliol, D.
    Astorga-Zaragoza, C. M.
    Camas-Anzueto, J. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/331392.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    fault diagnosis
    fault estimation
    LPV systems
    observer design
    descriptor system
    diagnostyka uszkodzeń
    estymacja błędu
    obserwator
    układ deskryptorowy
    Opis:
    This paper addresses the design of a state estimation and sensor fault detection, isolation and fault estimation observer for descriptor-linear parameter varying (D-LPV) systems. In contrast to where the scheduling functions depend on some measurable time varying state, the proposed method considers the scheduling function depending on an unmeasurable state vector. In order to isolate, detect and estimate sensor faults, an augmented system is constructed by considering faults to be auxiliary state vectors. An unknown input LPV observer is designed to estimate simultaneously system states and faults. Sufficient conditions to guarantee stability and robustness against the uncertainty provided by the unmeasurable scheduling functions and the influence of disturbances are synthesized via a linear matrix inequality (LMI) formulation by considering H∞ and Lyapunov approaches. The performances of the proposed method are illustrated through the application to an anaerobic bioreactor model.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2015, 25, 2; 233-244
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nutritional and antioxidant profile of the Physalis fruit grown in three Andean regions of Peru
    Autorzy:
    Obregón-La Rosa, A.J.
    Contreras-López, E.
    Juárez, E.F.
    Barrón, U.G.
    Muñoz, A.M.
    Ramos-Escudero, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/28765541.pdf
    Data publikacji:
    2023
    Wydawca:
    Narodowy Instytut Zdrowia Publicznego. Państwowy Zakład Higieny
    Opis:
    Background. Physalis peruviana L. fruit contains nutritional and bioactive compounds of immense importance to public health and represents a potential ingredient for the development of functional foods and beverages. Objective. This study aimed to determine the chemical and nutritional composition as well as the antioxidant capacity of the P. peruviana L. fruit grown in Peru in three areas of the Central Andean region. Material and methods. Proximal and physicochemical analyses and estimation of mineral content, vitamin C, total carotenoids, total polyphenols, and antioxidant capacity (2, 2-diphenyl-1-picrylhydrazyl [DPPH] and 2, 2′-azinobis (3-ethylbenzothiazoline-6-sulfonic acid) [ABTS] assays) were performed using standardized methods. Results. The fruits were collected from three regions of the Peruvian Andes (Ancash, Cajamarca, and Cusco). The results showed that the content of potassium (306.54–327.60 mg/100 g) and iron (12.93–14.47 mg/kg) was prominent. The Physalis fruit had high levels of vitamin C (47.20–52.20 mg/100 g), total polyphenols (68.17–83.40 mg equivalents of gallic acid/100 g), and carotenoids (1.12–1.73 mg β-carotene/100 g). Higher values for antioxidant capacity were obtained with the ABTS method (896–1003.33 μmol Trolox/100 g) than with the DPPH method (290–309 μmol Trolox/100 g). Conclusions. This study confirms that the P. peruviana fruit has properties that could provide important health benefits and that it could be used for the development of functional foods and food supplement.
    Źródło:
    Roczniki Państwowego Zakładu Higieny; 2023, 74, 1; 49-57
    0035-7715
    Pojawia się w:
    Roczniki Państwowego Zakładu Higieny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Environmental distribution of post-Palaeozoic crinoids from the Iberian and south-Pyrenean basins, NE Spain
    Autorzy:
    Zamora, S.
    Aurell, M.
    Veitch, M.
    Saulsbury, J.
    Lopez-Horgue, M.A.
    Ferratges, F.A.
    Arz, J.A.
    Baumiller, T.K.
    Powiązania:
    https://bibliotekanauki.pl/articles/22586.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Opis:
    Post-Palaeozoic crinoids from northeast Spain ranging from the Ladinian (Middle Triassic) to the Ilerdian (lower Ypresian, early Eocene) are documented. Here we provide the first attempt to reconstruct the environmental distribution of these crinoids based on relatively complete material (mostly cups). Triassic forms are dominated by encrinids from outer carbonate ramps. Late Jurassic crinoids are dominated by cyrtocrinids, comatulids, millericrinids, and isocrinids, occurring either on sponge mounds and meadows or on soft substrates within middle to outer carbonate ramps. Aptian (Early Cretaceous) forms include nearly complete isocrinids which are found in extremely shallow environments represented by bioclastic carbonates and interspersed oyster-rich layers. Other Aptian occurrences come from more distal and deep environments and are composed solely of comatulids. Albian forms are dominated by cyrtocrinids and isocrinids associated with coral reefs. Late Cretaceous and Eocene crinoids include mostly bourgueticrinids (Comatulida) that are found either in outer ramp facies or associated with mid-ramp reef complexes. The later corresponds to one of the shallowest occurrence of bourgueticrinids in the Cenozoic. The palaeoecological data for fossil crinoids of northeast Spain contributes to reconstructing the history of the bathymetric distribution of articulate crinoids, supporting the idea that stalked crinoids were able to inhabit a wide range of shallow marine environments in the late Mesozoic and early Cenozoic.
    Źródło:
    Acta Palaeontologica Polonica; 2018, 63, 4
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dual regulation of cytosolic ascorbate peroxide (APX) by tyrosine nitration and S-nitrosylation
    Autorzy:
    Begara-Morales, J.
    Sanchez-Calvo, B.
    Chaki, M.
    Valderrama, R.
    Mata-Perez, C.
    Lopez-Jaramillo, J.
    Carreras, A.
    Padilla, M.
    Corpas, F.
    Barroso, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/80378.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    conference
    post-translational modification
    nitric oxide
    target protein
    ascorbate peroxidase
    tyrosine nitration
    S-nitrosylation
    salinity stress
    Źródło:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2013, 94, 2
    0860-7796
    Pojawia się w:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A field trial of recombinant Schistosoma japonicum paramyosin as a potential vaccine in naturally-infected water buffaloes
    Autorzy:
    Jiz II, M.A.L.
    Mingala, C.N.
    Lopez, I.F.M.
    Chua, M.
    Gabonada Jr., F.G.
    Acosta, L.P.
    Wu, H.
    Kurtis, J.D.
    Powiązania:
    https://bibliotekanauki.pl/articles/6326.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Parazytologiczne
    Opis:
    The overall aims of this project are to assess the safety and immunogenicity of the Schistosoma japonicum vaccine paramyosin among water buffaloes residing in endemic areas. The study was conducted in four villages in Leyte, the Philippines, an area highly endemic for schistosomiasis japonica. One hundred and fifteen (N=115) animals provided baseline stool samples for coprologic examination, with preliminary results using FLOTAC showing a 10% prevalence of schistosomiasis. Forty-nine (N=49) animals consented to treatment with 25 mg/kg Praziquantel, and 40, 36 and 32 animals consented to the first, second and third dose of the paramyosin vaccine, respectively. The safety trial involved the first 20 animals and included skin testing, vaccination, anaphylaxis monitoring, as well as hematology and serum chemistry analysis. Skin tests revealed that only three out of 20 animals exhibited redness at the injection site, with none greater than 1 cm. None of the animals exhibited anaphylaxis, and all hematology and serum chemistry markers were within normal range or were similar to pre-vaccination levels. None of the 40 animals administered with the first dose exhibited anaphylaxis, nor any of the subsequent vaccine doses. Immunogenicity assessment of sera collected prior to every vaccination and one month after the last dose showed that the paramyosin vaccine induced robust antibody responses to all animals, as assessed by ELISA. The cytokine levels of whole blood culture supernatants will be further assessed. Our findings demonstrate that the S. japonicum paramyosin vaccine is a safe, well-tolerated and immunogenic treatment among water buffalos residing in endemic areas.
    Źródło:
    Annals of Parasitology; 2016, 62, 4
    0043-5163
    Pojawia się w:
    Annals of Parasitology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Orchards pruning to energy - the results of the environmental impact assessment of the new logistic chain developed within the EuroPruning project - Part 2
    Gałęzie z sadów na cele energetyczne - wyniki oceny oddziaływania na środowisko nowego łańcucha logistycznego opracowanego w ramach projektu EuroPruning - Cz. 2
    Autorzy:
    Dyjakon, A.
    Boer den, J.
    Garcia-Galindo, D.
    Adamczyk, F.
    Lopez, E.
    Sebastian, F.
    Suardi, A.
    Gebresenbet, G.
    Jirjis, R.
    Bosona, T.
    Germer, S.
    Bischoff, W. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/93472.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Inżynierii Rolniczej
    Tematy:
    pruned biomass
    energetic utilisation
    environmental impact assessment
    biomasa
    gałęzie
    wykorzystanie energetyczne
    ocena oddziaływania na środowisko
    Opis:
    To determine the environmental impact, the assessment of the EuroPruning project strategy has been carried out in accordance with the checking and scooping list related to Directive 97/11/EC. Additionally, some suggestions and recommendations to prevent/minimize the hazard of accidents or negative interaction on surrounding have been elaborated (according to the suggested procedure in ISO 14001 methodology: risk definition and prevention action proposal). As a consequence, the results of the inspection during the demo tests taking place in different orchards/plantations regarding the performance of the machineries operation, farmers’ habits and pruning residues harvesting procedures have been presented, in order to diagnose and determine possible risks that may occur and influence negatively the local environment. Similar activities have been carried out during the storage tests and transportation processes.
    W celu określenia stopnia oddziaływania na środowisko strategii przyjętej w projekcie EuroPruning, polegającej na wykorzystaniu ściętych gałęzi z sadów i plantacji w celach energetycznych, przeprowadzono analizę w oparciu o zasady postępowania zawarte w dyrektywie 97/11/EC. Dodatkowo, w odniesieniu do procedury zawartej w metodologii ISO 14001: definicja ryzyka i proponowane działania prewencyjne, opracowano wskazówki i rekomendacje mające na celu eliminację lub ograniczenie ryzyka wypadku czy negatywnego oddziaływania na otoczenie zewnętrzne. W konsekwencji, przedstawiono wyniki inspekcji dokonanych podczas badań testowych przeprowadzanych w różnych sadach i plantacjach drzew owocowych (obejmujących działanie pracujących maszyn, nawyki sadownika oraz proces zbierania ściętych gałęzi) pod kątem identyfikacji oraz określenia zakresu zagrożeń, które mogą wystąpić i wpływać negatywnie na środowisko. Podobne działania przeprowadzono dla procesu magazynowania i transportu biomasy sadowniczej.
    Źródło:
    Agricultural Engineering; 2018, 22, 1; 37-48
    2083-1587
    Pojawia się w:
    Agricultural Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    From Light to Heavy Nuclear Systems, Production and Decay of Fragments Studied with Powerful Arrays
    Autorzy:
    Casini, G.
    Morelli, L.
    Barlini, S.
    Piantelli, S.
    D'Agostino, M.
    Baiocco, G.
    Marchi, T.
    Abbondanno, U.
    Ademard, G.
    Appannababu, S.
    Bini, M.
    Bonnet, E.
    Borderie, B.
    Bougault, R.
    Bruno, M.
    Chbihi, A.
    Cinausero, M.
    Degerlier, M.
    Fabris, D.
    Frankland, J.
    Gelli, N.
    Gramegna, F.
    Gruyer, D.
    Gulminelli, F.
    Kordyasz, A.
    Kozik, T.
    Kravchuk, V.
    Kulig, P.
    Le Neindre, N.
    Lopez, O.
    Maurenzig, P.
    Olmi, A.
    Pasquali, G.
    Pârlog, M.
    Poggi, G.
    Rivet, M.
    Rosato, E.
    Sosin, Z.
    Spadaccini, G.
    Stefanini, A.
    Twarog, T.
    Valdrè, S.
    Vient, E.
    Raduta, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402639.pdf
    Data publikacji:
    2015-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    25.70.Gh
    25.70.Pq
    25.70.Mn
    29.40.-n
    Opis:
    Reactions between heavy-ions at various energy regimes produce many nuclear fragments which can be populated in highly excited states. The study of these fragments, detected at the end of their particle decay, is important to investigate nuclear forces and structure effects. In recent years there have been many efforts to extend these studies towards the drip-lines, i.e. to systems far from the β-stability valley, by using accelerated radioactive beams. The development of such infrastructures is accompanied by the development of more powerful detectors and associated electronics, capable to identify ions with very different sizes and kinetic energies. Here we give two examples which show how advanced arrays can contribute to the studies on nuclear phenomena. The examples come from the European FAZIA collaboration and from recent campaigns with the GARFIELD apparatus, the latter in operation at the INFN Legnaro Laboratory (Italy) where the SPES RIB facility is under construction.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 5; 1548-1551
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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