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Wyszukujesz frazę "Ramírez, Juan" wg kryterium: Autor

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    Wyświetlanie 1-6 z 6
    Tytuł:
    Quasilinearization method for finite systems of nonlinear RL fractional differential equations
    Autorzy:
    Denton, Zachary
    Ramirez, Juan Diego
    Powiązania:
    https://bibliotekanauki.pl/articles/1397341.pdf
    Data publikacji:
    2021
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    fractional differential systems
    lower and upper solutions
    quasilinearization method
    Opis:
    In this paper the quasilinearization method is extended to finite systems of Riemann-Liouville fractional differential equations of order 0 < q < 1. Existence and comparison results of the linear Riemann-Liouville fractional differential systems are recalled and modified where necessary. Using upper and lower solutions, sequences are constructed that are monotonic such that the weighted sequences converge uniformly and quadratically to the unique solution of the system. A numerical example illustrating the main result is given.
    Źródło:
    Opuscula Mathematica; 2020, 40, 6; 667-683
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental study of mechanical losses of single-cylinder spark-ignited engine
    Autorzy:
    Romero, Carlos A.
    Henao, Edison
    Ramírez, Juan
    Powiązania:
    https://bibliotekanauki.pl/articles/1840848.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
    Tematy:
    internal combustion engines
    friction losses
    pumping losses
    mechanical efficiency
    silnik spalinowy
    straty tarcia
    sprawność mechaniczna
    Opis:
    In this study, the mechanical losses of a single-cylinder spark-ignited Robin EY15 engine were experimentally determined and analysed by the indicated method. The effects of the load and speed on the mechanical loss balance were also analysed. The tests were conducted on a test bench equipped with a DC motor generator at speeds between 1500 and 4800 min-1 and three load levels of 25, 50, and 100%. The results showed that the mechanical efficiency ranges between 22.5% and 83.2% for the tested engine and the evaluated operation points, attaining the highest efficiency under the full load and 2100 min-1. However, at this load level, the efficiency is reduced to 29% with the increase in the rotation speed. Concurrently, the pumping losses contribute up to 58.7% of the total losses, which indicates that their contribution is even higher than the sum of the other components under low load conditions. However, as the load increases, this contribution decreases to 18% for lower rotation regimes. In addition, the experimental results of the total mechanical losses were compared with some numerical correlations found in the literature. Finally, some empirical correlations were proposed for the mechanical efficiency calculation of the tested engine.
    Źródło:
    Diagnostyka; 2021, 22, 3; 13-24
    1641-6414
    2449-5220
    Pojawia się w:
    Diagnostyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental study of mechanical losses of single-cylinder spark-ignited engine
    Autorzy:
    Romero, Carlos A.
    Henao, Edison
    Ramírez, Juan
    Powiązania:
    https://bibliotekanauki.pl/articles/1840879.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
    Tematy:
    internal combustion engines
    friction losses
    pumping losses
    mechanical efficiency
    silnik spalinowy
    straty tarcia
    sprawność mechaniczna
    Opis:
    In this study, the mechanical losses of a single-cylinder spark-ignited Robin EY15 engine were experimentally determined and analysed by the indicated method. The effects of the load and speed on the mechanical loss balance were also analysed. The tests were conducted on a test bench equipped with a DC motor generator at speeds between 1500 and 4800 min-1 and three load levels of 25, 50, and 100%. The results showed that the mechanical efficiency ranges between 22.5% and 83.2% for the tested engine and the evaluated operation points, attaining the highest efficiency under the full load and 2100 min-1. However, at this load level, the efficiency is reduced to 29% with the increase in the rotation speed. Concurrently, the pumping losses contribute up to 58.7% of the total losses, which indicates that their contribution is even higher than the sum of the other components under low load conditions. However, as the load increases, this contribution decreases to 18% for lower rotation regimes. In addition, the experimental results of the total mechanical losses were compared with some numerical correlations found in the literature. Finally, some empirical correlations were proposed for the mechanical efficiency calculation of the tested engine.
    Źródło:
    Diagnostyka; 2021, 22, 3; 13-24
    1641-6414
    2449-5220
    Pojawia się w:
    Diagnostyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A methodology for non-invasive diagnosis of diesel engines through characteristics of starter system performance
    Autorzy:
    Ramírez, Juan D.
    Romero, Carlos A.
    Mejía, Juan C.
    Quintero, Héctor F.
    Powiązania:
    https://bibliotekanauki.pl/articles/2096186.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
    Tematy:
    internal combustion engines
    engine diagnosis
    starting system
    starting process
    silniki spalinowe
    diagnozowanie silników
    układ rozruchowy
    Opis:
    In this work, a methodology to diagnose ten diesel bus engines is carried out by means of some characteristics of the starting system performance. The signals of battery voltage, electric current supplied to the starter motor and crankshaft revolutions during cold and warm engine starting processes are analysed. Characteristics and patterns of the signals that are attributable to engine compression and combustion failures are pointed out, which are related to the kilometres travelled by each vehicle after the last engine repair and the shutdown time of the engine in warm condition. It is obtained that the rise of the current required by the starter motor during the second and third compression process, and the mean crankshaft angular acceleration after the second compression process are characteristics that are related to the engine condition.
    Źródło:
    Diagnostyka; 2022, 23, 2; art. no. 2022202
    1641-6414
    2449-5220
    Pojawia się w:
    Diagnostyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improvement of Mental Health and Cooperation Skills: Curriculum for Peacekeeping Personnel
    Autorzy:
    Farnicka, Marzanna
    Fernández, Juan Carlos
    Ramirez, Jesús Martin
    Powiązania:
    https://bibliotekanauki.pl/articles/1167597.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Kazimierza Wielkiego w Bydgoszczy
    Tematy:
    development of one’s own resources strona
    Opis:
    Preparation for work in the field of peacebuilding should always be undertaken from multiple perspectives, as actions and their consequences are bound to bring about changes in many aspects, such as mental health and competences of staff responsible for peacekeeping. The general aim of the presented article is to underline the role of psychological skills necessary for high level functioning of peacemakers and peacekeepers in various countries. The presented program covers two fundamental training areas: keeping good mental health and developing cooperation skills. The main focus was placed on the way to identify barriers and challenges faced by organizers of the process of preparing and building competencies in the scope of conflict prevention, protection of own resources (health protection area) and group resources (social capital area). An important aspect of raising the competencies of staff engaged in building and maintaining peace is the ability to control emotions and to counteract pathological reactions connected with working under prolonged stress caused, for instance, by changing one’s place of stay, encounters with strangers and hostile persons, huge pressure and responsibility.
    Źródło:
    Polskie Forum Psychologiczne; 2017, XXII, 1; 57-70
    1642-1043
    Pojawia się w:
    Polskie Forum Psychologiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Chloride Salinity on Cadmium uptake by Nicotiana tabacum in a Rhizofiltration System
    Autorzy:
    Lopez-Chuken, Ulrico Javier
    Barceló-Quintal, Icela Dagmar
    Ramirez-Lara, Evangelina
    Cantu-Cardenas, Maria Elena
    Villarreal-Chiu, Juan Francisco
    Beltran-Rocha, Julio Cesar
    Guajardo-Barbosa, Claudio
    Castillo-Zacarias, Carlos Jesus
    Gomez-Salazar, Sergio
    Orozco-Guareno, Eulogio
    Powiązania:
    https://bibliotekanauki.pl/articles/1845418.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cadmium
    chloride-complexes
    root surface area
    leaf surface area
    hydroponics
    biotic ligand model
    Opis:
    A hydroponic trial was conducted to study the effect of chloride salinity in simulated effluent on Cd accumulation by tobacco. Leaf surface area (LSA) and root surface area (RSA) measurements were incorporated as possible determinants of Cd uptake rate by plants. Results showed that individual plant differences in Cd content were normalized when including RSA to express Cd uptake rates by plants but not including LSA. A biotic ligand model (BLM) fitted to predict Cd uptake, estimated active and almost linear uptake of the free Cd2+ ion by tobacco plants, while virtually no changes in the chloride complex (CdCl+) uptake were predicted, presumably due to a rapid saturation of the hypothetical root sorption sites at the concentrations used in this trial. Nicotiana tabacum var. K326 is evidenced to be a species potentially suitable for biological wastewater treatment using rhizofiltration at concentrations commonly found in salt-affected wastewater, with high Cd accumulation (185 to 280 mg/kgdm) regardless of water salinity and tolerance up to 80 mmol/L NaCl.
    Źródło:
    Archives of Environmental Protection; 2021, 47, 1; 35-40
    2083-4772
    2083-4810
    Pojawia się w:
    Archives of Environmental Protection
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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