Autor: Rodriguez, J. - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: A nonlinear model of a turbine blade by asymptotic analysis
Autorzy:: Rodriguez, J. M.
Tematy:: matematyka
asymptotic analysis
nonlinear elasticity
junctions
shallow shells
multistructures; Pokaż więcej
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Powiązania:: https://bibliotekanauki.pl/articles/907896.pdf Link otwiera się w nowym oknie
Opis:: In this paper we obtain a limit model for a turbine blade fixed to a 3D solid. This model is a three-dimensional linear elasticity problem in the 3D part of the piece (the rotor) and a two-dimensional problem (the nonlinear shallow shell equations) in the 2D part (the turbine blade), with junction conditions in the part of the turbine blade fixed to the rotor. To obtain this model, we perform an asymptotic analysis, starting with the nonlinear three-dimensional elasticity equations on all the pieces and taking as a small parameter the thickness of the blade.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: An algebraic derivative associated to the operator $D^δ$
Autorzy:: Almeida, V.
Castro, N.
Rodríguez, J.
Wydawca:: Polska Akademia Nauk. Instytut Matematyczny PAN
Powiązania:: https://bibliotekanauki.pl/articles/1207615.pdf Link otwiera się w nowym oknie
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
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Bio-methanization of organic fraction from municipal solid waste: temperature effects
Autorzy:: Fernández-Rodríguez, J.
Pérez, M.
Romero, L. I.
Tematy:: anaerobic digestion
OFMSW
mesophilic
thermophilic
methane; Pokaż więcej
Wydawca:: Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Powiązania:: https://bibliotekanauki.pl/articles/779264.pdf Link otwiera się w nowym oknie
Opis:: The main objective of this study was to analyse the development of dry anaerobic digestion process of OFMSW in batch reactors under two temperature ranges, thermophilic (55°C) and mesophilic (35°C). The experimental results lead to the conclusion that the thermophilic range has a greater rate of hydrolysis and is therefore more effective to degrade wastes, shortening the overall operating time. For example, the hydrolytic step in the thermophilic (T) process lasted an average of 8 days versus 14 days in the mesophilic (M) range. The methanogenic phase lasted for 18 and 29 days in the T and M processes, respectively. The mesophilic range showed higher removal of the organic effluent but with greater uptime requirements. Moreover, the thermophilic range showed greater productivities than the mesophilic range, and the productivities were approximately doubled in terms of the produced biogas from a given amount of consumed organic matter.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Książka = Book ; KS/6/2013/T1P04
New trends in fuzzy sets, intuitionistic fuzzy sets, generalized nets and related topics. Volume I: Foundations * Intuitionistic fuzzy preference structures
Autorzy:: Montero, Javier
Melo-Pinto, Pedro
Rodriguez, J.
Franco, Camilo
Wydawca:: Instytut Badań Systemowych. Polska Akademia Nauk
Systems Research Institute. Polish Academy of Sciences
Powiązania:: Książka = Book
Opis:: Bibliografia s. 45-48
[5], 31-48 stron ; 21 cm
Here we examine the preference predicate and its decomposition into preference structures from the perspective of Atanassov's Intuinistic Fuzzy Sets (A-IFS). We focus on the way the meaning/semantic of the preference predicate is measured according to the propertief of being desired and of being non-desired, such of some type of uncertainty may exsit regarding the way in which both properties are understood. Hence, we explore the existence of not just one but different types of uncertainties, which rise from the particular semantics assigned to the preference predicate.
[5], 31-48 pages ; 21 cm
Bibliography p. 45-48
Dostawca treści:: RCIN - Repozytorium Cyfrowe Instytutów Naukowych

Książka

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Skocz do pozycji: 5.

Tytuł:: Second critical micelle concentration of dodecyldimethylbenzylammonium chloride in aqueous solution at $25^{o}\textrm{C}$
Autorzy:: Rodríguez, J. R.
Czapkiewicz, Jan
González-Pérez, A.
Prieto, G.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

Artykuł

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Skocz do pozycji: 6.

Tytuł:: Numerical analysis of emissions from marine engines using alternative fuels
Autorzy:: Lamas, M. I.
Rodriguez, C. G.
Telmo, J.
Rodriguez, J. D.
Tematy:: fuel
natural gas
hydrogen
marine engine
emissions; Pokaż więcej
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Powiązania:: https://bibliotekanauki.pl/articles/260425.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Numerical model of so2 scrubbing with seawater applied to marine engines
Autorzy:: Lamas, M. I.
Rodríguez, C. G.
Rodríguez, J. D.
Telmo, J.
Tematy:: sulphur dioxide
SO2
scrubbers
CFD; Pokaż więcej
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Powiązania:: https://bibliotekanauki.pl/articles/258856.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

Artykuł

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Skocz do pozycji: 8.

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.
Tematy:: marine engine
emissions
consumption
artificial neural networks
multi-criteria decision making
computational fluid dynamics; Pokaż więcej
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Powiązania:: https://bibliotekanauki.pl/articles/2033205.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

Artykuł

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Skocz do pozycji: 9.

Tytuł:: Micellar properties of octyldimethylbenzylammonium bromide in water
Autorzy:: Czapkiewicz, J.
González-Pérez, A.
Del Castillo, J. L.
Rodríguez, J.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

Artykuł

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Skocz do pozycji: 10.

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.
Tematy:: forging device
hydraulic trompe
3D modelling
computational fluid dynamics
finite element analysis
urządzenie do kucia
modelowanie 3D
analiza elementów skończonych; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/200411.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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