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Wyszukujesz frazę "Rodriguez, J. D." wg kryterium: Wszystkie pola

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Wyświetlanie 1-10 z 20
Tytuł:
Numerical model of so2 scrubbing with seawater applied to marine engines
Autorzy:
Lamas, M. I.
Rodríguez, C. G.
Rodríguez, J. D.
Telmo, J.
Powiązania:
https://bibliotekanauki.pl/articles/258856.pdf
Data publikacji:
2016
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
sulphur dioxide
SO2
scrubbers
CFD
Opis:
The present paper proposes a CFD model to study sulphur dioxide (SO2) absorption in seawater. The focus is on the treatment of marine diesel engine exhaust gas. Both seawater and distilled water were compared to analyze the effect of seawater alkalinity. The results indicate that seawater is more appropriate than distilled water due to its alkalinity, obtaining almost 100% cleaning efficiency for the conditions analyzed. This SO2 reduction meets the limits of SOx emission control areas (SECA) when operating on heavy fuel oil. These numerical simulations were satisfactory validated with experimental tests. Such data are essential in designing seawater scrubbers and judging the operating cost of seawater scrubbing compared to alternative fuels.
Źródło:
Polish Maritime Research; 2016, 2; 42-47
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical analysis of emissions from marine engines using alternative fuels
Autorzy:
Lamas, M. I.
Rodriguez, C. G.
Telmo, J.
Rodriguez, J. D.
Powiązania:
https://bibliotekanauki.pl/articles/260425.pdf
Data publikacji:
2015
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
fuel
natural gas
hydrogen
marine engine
emissions
Opis:
The current restrictions on emissions from marine engines, particularly sulphur oxides (SOx ), nitrogen oxides (NOx ) and carbon dioxide (CO2 ), are compelling the shipping industry to a change of tendency. In the recent years, many primary and secondary reduction techniques have been proposed and employed in marine engines. Nevertheless, the increasingly restrictive legislation makes it very difficult to continue developing efficient reduction procedures at competitive prices. According to this, the paper presents the possibility to employ alternative fuels. A numerical model was developed to analyze the combustion process and emissions using oil fuel, natural gas and hydrogen. A commercial marine engine was studied, the Wartsila 6L 46. It was found, that hydrogen is the cleanest fuel regarding CO2 , hydrocarbons (HC) and carbon monoxide (CO). Nevertheless, it is very expensive for marine applications. Natural gas is cheaper and cleaner than fuel oil regarding CO2 and CO emissions. Still, natural gas emits more NOx and HC than oil fuel. SOx depends basically on the sulphur content of each particular fuel.
Źródło:
Polish Maritime Research; 2015, 4; 48-52
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the pre-injection system of a marine diesel engine through multiple-criteria decision-making and artificial neural networks
Autorzy:
Rodriguez, C. G.
Lamas, M. I.
Rodriguez, J. D.
Abbas, A.
Powiązania:
https://bibliotekanauki.pl/articles/2033205.pdf
Data publikacji:
2021
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
marine engine
emissions
consumption
artificial neural networks
multi-criteria decision making
computational fluid dynamics
Opis:
The present work proposes several pre-injection patterns to reduce nitrogen oxides in the Wartsila 6L 46 marine engine. A numerical model was carried out to characterise the emissions and consumption of the engine. Several pre-injection quantities, durations, and starting instants were analysed. It was found that oxides of nitrogen can be noticeably reduced but at the expense of increasing consumption as well as other emissions such as carbon monoxide and hydrocarbons. According to this, a multiple-criteria decision-making (MCDM) model was established to select the most appropriate parameters. Besides, an artificial neural network (ANN) was developed to complement the results and analyse a huge quantity of alternatives. This hybrid MCDM-ANN methodology proposed in the present work constitutes a useful tool to design new marine engines.
Źródło:
Polish Maritime Research; 2021, 4; 88-96
1233-2585
Pojawia się w:
Polish Maritime Research
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:
An algebraic derivative associated to the operator $D^δ$
Autorzy:
Almeida, V.
Castro, N.
Rodríguez, J.
Powiązania:
https://bibliotekanauki.pl/articles/1207615.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Opis:
In this paper we get an algebraic derivative relative to the convolution $(f*g)(t)=∫_0^ti f(t-ψ)g(ψ)dψ$ associated to the operator $D^δ$, which is used, together with the corresponding operational calculus, to solve an integral-differential equation. Moreover we show a certain convolution property for the solution of that equation
Źródło:
Banach Center Publications; 2000, 53, 1; 71-78
0137-6934
Pojawia się w:
Banach Center Publications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prediction of biological sensors appearance with ARIMA models as a tool for Integrated Pest Management protocols
Autorzy:
Fernandez-Gonzalez, M.
Ramos-Valcarcel, D.
Aira, M.J.
Rodriguez-Rajo, F.J.
Powiązania:
https://bibliotekanauki.pl/articles/50204.pdf
Data publikacji:
2016
Wydawca:
Instytut Medycyny Wsi
Źródło:
Annals of Agricultural and Environmental Medicine; 2016, 23, 1
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of ancient forging devices: 3D modelling and analysis using current computer methods
Autorzy:
Rojas-Sola, J. I.
Bouza-Rodríguez, J. B.
Comesaña-Campos, A.
Powiązania:
https://bibliotekanauki.pl/articles/200411.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
forging device
hydraulic trompe
3D modelling
computational fluid dynamics
finite element analysis
urządzenie do kucia
modelowanie 3D
analiza elementów skończonych
Opis:
An ancient forging device in Spain has been studied, namely the forge with a waterwheel and air-blowing tube or hydraulic trompe, found near the village of Santa Eulalia de Oscos (province of Asturias, Spain). Three procedures using ad hoc methods were applied: 3D modelling, finite element analysis (FEA), and computational-fluid dynamics (CFD). The CFD results indicated the proper functioning of the trompe, which is a peculiar device based on the Venturi effect to take in air. The maximum air volume flow rate supplied to the forge by the trompe was shown to be 0.091 m3/s, and certain parameters of relevance in the trompe design presented optimal values, i.e. offering maximum air-flow supply. Furthermore, the distribution of stress over the motion-transmission system revealed that the stress was concentrated most intensely in the cogs of the transmission shaft (a kind of camshaft), registering values of up to 7.50 MPa, although this value remained below half of the maximum admissible work stress. Therefore, it was confirmed that the oak wood from which the motion system and the trompe were made functioned properly, as these systems never exceeded the maximum admissible working stress, demonstrating the effectiveness of the materials used in that period.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2019, 67, 2; 377-390
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mental health of Filipino seafarers: the contributory factors and the strategies applied onboard ship
Autorzy:
Sarinas, B. G. S.
Botante, J. D. D.
Nacion, J. S.
Bernas, M. L. B.
Rodriguez, O.
Powiązania:
https://bibliotekanauki.pl/articles/2172470.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
mental health
seafarers
Filipino
onboard test
stress fatigue
seafarers problems
Opis:
Mental health is equally important with physical health. Many reports found out that poor mental health is one of the major factors of depression among seafarers. This study ascertains the factors affecting mental health and the strategies applied by Filipino seafarers to combat these issues. A survey was used as a research design. A total of 100 seafarers taken through convenience and snowball sampling answered the validated researcher-made questionnaire. The questionnaire was sent in the JBLFMU Alumni Portal, messenger, and Gmail. Frequency, percentage, and rank were used. Themes were used to classify the strategies applied by seafarers to counteract mental health issues onboard ship. The results revealed that the major contributory factor affecting the mental health of Filipino seafarers is stress, while they believed that a positive outlook in life makes one’s self free from mental health problems onboard. The top three factors are stress, fatigue, and separation from families and friends. The top three strategies to counteract factors that affect seafarers’ mental health onboard ship are staying positive, socializing with crewmates, and communicating with family.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2022, 16, 1; 125--134
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
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:
Economic and environmental viability of building recovery in Seville (Spain). Phase 1: database in Arcgis
Autorzy:
Alba-Rodríguez, D.
Marrero, M.
Solís-Guzmán, J.
Powiązania:
https://bibliotekanauki.pl/articles/344719.pdf
Data publikacji:
2013
Wydawca:
Politechnika Krakowska im. Tadeusza Kościuszki. Wydział Architektury. Katedra Kształtowania Środowiska Mieszkaniowego
Tematy:
renovation
rehabilitation
demolition
environmental viability
cost evaluation
Opis:
The main objective of this work is the design of a model for the technical, economic and environmental evaluation in the rehabilitation and renovation of buildings versus their demolition. A first analysis is performed on the rehabilitation and renovation of buildings versus their demolition in the historical centre of Seville, Spain. Considering that many European cities have a historical centre that in many cases also represents the most authentic part of the city, this project can be adopted as an assessment tool for many similar case studies. In a first stage, a database for Seville, Spain, has been created using ArcGIS, which identifies those buildings needing restoration. The house of tomorrow maybe the one we already inhabit by transforming it with the renovations necessary in order to make it more safe, secure, energy efficient and comfortable, finally transforming it into a contemporary dwelling, even if they are part of a historical city centre.
Źródło:
Środowisko Mieszkaniowe; 2013, 11; 297-302
1731-2442
2543-8700
Pojawia się w:
Środowisko Mieszkaniowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 20

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