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    Wyświetlanie 1-4 z 4
    Tytuł:
    A new intelligentapproach in predictive maintenance of separation system
    Autorzy:
    Marichal, G. N.
    Ávila, D.
    Hernández, A.
    Padrón, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/116306.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    marine fuel separators
    separation system
    predictive maintenance
    greenhouse gas (GHG)
    Fast Fourier Transformation (FFT)
    genetic neuro-fuzzy system
    genetic algorithm
    supervised learning
    Opis:
    Reducing contaminant emissions is an important task of any industry, included the maritime one. In fact, in April 2018, IMO (International Maritime Organization) adopted an Initial Strategy on reduction of Greenhouse gas (GHG) emissions from ships. An essential part responsible for producing these emissions is the diesel engine. For that reason vessels include separation systems for heavy fuel oils. The purpose of this work is to improve the predictive maintenance techniques incorporating new intelligent approaches. An analysis of vibrations of this separation system was made and their characteristics were used in a Genetic Neuro-Fuzzy System in order to design an intelligent maintenance based on condition monitoring. The achieved results show that the proposed method provides an improvement since it indicates if a maintenance operation is necessary before the schedule one or if it could be possible extend the next maintenance service.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2020, 14, 2; 385-390
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Distinguishing Quaternary glyptodontine cingulates in South America: How informative are juvenile specimens?
    Autorzy:
    Luna, C.A.
    Cerda, I.A.
    Zurita, A.E.
    Gonzalez, R.
    Prieto, M.C.
    Mothe, D.
    Avila, L.S.
    Powiązania:
    https://bibliotekanauki.pl/articles/20747.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Opis:
    The subfamily Glyptodontinae (Xenarthra, Cingulata) comprises one of the most frequently recorded glyptodontids in South America. Recently, the North American genus Glyptotherium was recorded in South America, in addition to the genus Glyptodon. It has been shown that both genera shared the same geographic distribution in central-north and eastern areas of South America (Venezuela and Brazil, respectively). Although some characters allow differentiation between adult specimens of both genera, the morphological distinction between these two genera is rather difficult in juvenile specimens. In this contribution, a detailed morphological, morphometric and histological survey of a juvenile specimen of Glyptodontinae recovered from the Late Pleistocene of northern Brazil is performed. The relative lower osteoderms thickness, the particular morphology of the annular and radial sulci and the distal osseous projections of the caudal osteoderms suggest that the specimen belongs to the genus Glyptotherium. In addition, the validity of some statistical tools to distinguish between different ontogenetic stages and in some cases between genera is verified. The osteoderm microstructure of this juvenile individual is characterized by being composed of a cancellous internal core surrounded by a compact bone cortex. Primary bone tissue mostly consists of highly vascularized, woven-fibered bone tissue. Unlike that observed in adult Glyptodontinae, both the Sharpey fibers and the fibrous and laminar parallel bone tissue as secondary bone are absent. This study enhances our knowledge about those morphological and histological changes that occur through the ontogeny in glyptodonts.
    Źródło:
    Acta Palaeontologica Polonica; 2018, 63, 1
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Implementation and Compliance of the International Ship and Port Facility Security Code in Mexico: A literature Review and Selected Issues
    Autorzy:
    Ávila‐Zúñiga‐Nordfjeld, A.
    Dalaklis, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/116798.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Port Facility Security Plan (PFSP)
    literature review
    International Ship and Port Facility Security Code (ISPS Code)
    ISPS Code in Mexico
    ISPS Code
    SOLAS Convention
    International Maritime Organization (IMO)
    International Standards Implementation
    Opis:
    This paper provides a literature review of the state of the art on implementation and compliance of the International Ship and Port Facility Security Code (ISPS Code), for the case of Mexico. This investigation was initially oriented solely towards Mexico, but due to the absence of research within this subject for the referred country the review had to be done through subcategories with the conditional connection of Mexico and relevant issues were selected. The primary data confirmed the absence of research within this subject in Mexico. The secondary data, were other words related to the ISPS Code were used for the search, allowed for a wider geographical coverage and an expanded on general bases the scope of analysis, since ten (10) different academic databases were exploited. The literature review from an author-centric approach is initially presented; then, it is used as the basis to further develop (and examine) the concept-centric approach, through eight selected categories. The careful screening of literature, constructed on specific concepts, allowed the identification of cross fertilization of such concepts in the respective fields. It is observed that the research efforts focused on the ISPS Code and the development of a Port Facility Security Plan (PFSP) have an integrated perspective, where the categories of terrorism and counterterrorism, as well as maritime security management and the issue of port security have a strong interaction and dominant status. The results demonstrate the limited number of academic contributions in these areas from America Central and South America in relation to other parts of the globe, as well as the total absence of research efforts about the ISPS Code in Mexico. In the scientific contributions on the subject were Mexico is included; it is in reference to isolated cases of armed robbery, drugs organizations or proliferation of crime on general bases, but not regarding the ISPS Code itself. The absence of scientific research on this area for the specific country might also be related to the lack of a national maritime security policy and a poor maritime security culture as the authors have pointed out in other contributions.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2018, 12, 2; 363-373
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Opening of offshore oil business in Mexico and associated framework to cope with potential maritime security threats
    Autorzy:
    Ávila-Zúñiga-Nordfjeld, A.
    Dalaklis, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/117224.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    offshore oil business
    ISPS Code
    critical offshore infrastructure
    offshore technology
    Port Facility Security Plan (PFSP)
    port’s security program
    Mexican ports
    maritime security
    Opis:
    After 75 years of State oil monopoly, Mexico performed the first business oil round in 2015 involving the private sector. This auction-round offered 14 oil exploration fields located on the continental shelf to private companies. The development and exploitation of these hydrocarbon fields faces significant challenges regarding security. The economic loss for theft of hydrocarbons through illegal connections to pipelines is estimated to 973 million, 125 thousand U.S. dollar, only for the year of 2014. While productive research has been made, it has mainly focused on transportation systems and basically, pipelines. The development and establishment of policies prioritizing maritime security and protection of critical offshore infrastructure against theft of hydrocarbons, drugs organizations and terror attacks needs to be included in the national agenda to improve maritime security and mitigate potential security threats at sea, including damage to the marine environment. This could increase the trust of investors and stakeholders and would contribute to the faster development of new exploration and production fields. While the International Ship and Port Facility Security Code (ISPS Code) is the cornerstone for the construction of the port's security program and establishes the requirements of the Port Facility Security Plan (PFSP), including oil port facilities, it has not been fully implemented in several important Mexican ports. It is concluded that some important ports lack many of the core security processes, procedures and controls that should be included in any PFSP. This article briefly reviews the situation of the oil industry from a security perspective and discusses key elements of maritime security; addressing the necessity of the inclusion of maritime security and protection of critical oil infrastructure offshore in the national agenda that would provide for future research directions in the maritime security domain and contribute to the establishment of a national maritime security policy.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2018, 12, 1; 173-179
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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