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    Wyświetlanie 1-6 z 6
    Tytuł:
    Impact of climate changes on the Santos Harbor, São Paulo State (Brazil)
    Autorzy:
    Alfredini, P.
    Arasaki, E.
    Pezzoli, A.
    Fournier, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/117446.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Climate Changes
    Santos Harbor Area (SHA)
    Sao Paulo Coastline
    Brazilian Coast
    Access Channels
    Flooding
    Overall Depth Necessary for a Safe Navigation (ODSN)
    safety at sea
    Opis:
    Santos Harbor Area (SHA) in Sao Paulo Coastline (Brazil) is the most important marine cargo transfer terminal in the Southern Hemisphere. A long term relative tidal level variability assessment shows a consistent response to relative sea level rise. A wave data base Wave Watch III was compared with a long term wave data-base generated by the ERA40-ECMWF (2003), both local validated. The current bed level of SHA Outer Channel is -15.00 m (Chart Datum or, in abbreviation, CD), maintained by dredging. According to the cargo throughput forecast, in 2025, the Access Channel will have to be deepened to level of -17.00 m. The feasibility of that choice is discussed from a technical, economical and conceptual navigation point of view in that context. A data set found from a scale model of the whole area of Santos Bay, Estuary and nearby beaches, showed the impact of maritime climate changes upon the coastal area. In the previous researches developed by the authors, it was demonstrated that the wave climate, the tides and tidal currents affect harbor and coastal structures maintenance, beaches stability, tidal inlet, sediment transport, saline intrusion and wetlands. Considering the increasing of the sea hazards and the high values of the infrastructures in that coastline, it is necessary to mitigate the risks. Hence, based on the results obtained by the authors, are highlighted guidelines strategies suggested for Access Channels dimensions, wharves free-board, jetties dimensions, dredging rates, rigid and flexible littoral defenses and land protection against flooding (including wetlands).
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2013, 7, 4; 609-617
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analyses of Code Division Multiple Access (CDMA) Schemes for Global Mobile Satellite Communications (GMSC)
    Autorzy:
    Ilcev, D. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1841573.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Global Mobile Satellite Communications
    Code Division Multiple Access
    Multiple Access Technique
    Satellite Communication Systems
    Mobile Earth Station
    orthogonal channels of transmission
    GMSC Networks
    very small aperture terminals
    Opis:
    This paper describes in particular Code Division Multiple Access (CDMA) applicable in Global Mobile Satellite Communications (GMSC). In satellite communication systems, as a rule, especially in GMSC networks many users are active at the same time. The problem of simultaneous communications between many single or multipoint mobile satellite users, however, can be solved by using Multiple Access Technique (MAT) system. Since the resources of the systems such as the transmitting power and the bandwidth are limited, it is advisable to use the channels with complete charge and to create a different MAT to the channel. This generates a problem of summation and separation of signals in the transmission and reception parts, respectively. Deciding this problem consists in the development of orthogonal channels of transmission in order to divide signals from various users unambiguously on the reception part.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2020, 14, 4; 805-810
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Rozwój średnich i małych portów morskich – wzrost znaczenia regionów nadmorskich
    Development of Small and Medium-Sized Seaports – Activation as a Stimulus to Seaside Regions’ Economic Growth
    Autorzy:
    Jasiurska-Kluczek, Ewa
    Malcharek, Rafał
    Powiązania:
    https://bibliotekanauki.pl/articles/416470.pdf
    Data publikacji:
    2019-06
    Wydawca:
    Najwyższa Izba Kontroli
    Tematy:
    seaports development
    maritime transport
    small and medium-sized seaports seaports' maritime infrastructure
    maritime access infrastructure channels channels
    depth
    draught
    maritime office
    port authority
    Opis:
    Seaports are a natural link between the land and sea transportation. Their development is a prerequisite in order to, among others, provide the capacity to trans-ship the growing number of goods. Sea transportation covers altogether 75 percent of the European external trade and 37 percent of the internal trade within the European union. In Poland, there are 33 active seaports, out of which six are big ports, while 27 are medium-sized and small seaports. Over the last years, however, only big ports observe a significant growth in the volume of the goods trans-shipped there, while the role of medium-sized and small ports has been diminishing. That is why the Supreme Audit Office took a decision to examine whether and how the maritime administration, the governors of regions and the entities that manage sea ports implemented the measures set forth in seaports development plans and strategies. In their article, the authors present the details of the audit findings.
    Źródło:
    Kontrola Państwowa; 2019, 64, 3 (386); 65-86
    0452-5027
    Pojawia się w:
    Kontrola Państwowa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Power Allocation for Energy-Harvesting-based Fading Cognitive Multiple Access Channels : with or without Successive Interference Cancellation
    Autorzy:
    Li, Q.
    Xu, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/963855.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cognitive radio
    power allocation
    multiple access channels
    energy harvesting
    Opis:
    This paper considers a fading cognitive multiple access channel (CMAC), where multiple secondary users (SUs), who share the spectrum with a primary user (PU), transmit to a cognitive base station (CBS). A power station is assumed to harvest energy from the nature and then provide power to the SUs. We investigate the power allocation problems for such a CMAC to maximize the SU sum rate under the interference power constraint, the sum transmit power constraint and the peak transmit power constraint of each individual SU. In particular, two scenarios are considered: with successive interference cancellation (SIC) and without SIC. For the first scenario, the optimal power allocation algorithm is derived. For the second scenario, a heuristic algorithm is proposed. We show that the proposed algorithm with SIC outperforms the algorithm without SIC in terms of the SU sum rate, while the algorithm without SIC outperforms the algorithm with SIC in terms of the number of admitted SUs for a high sum transmit power limit and a low peak transmit power limit of each individual SU.
    Źródło:
    International Journal of Electronics and Telecommunications; 2017, 63, 1; 65-72
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Secrecy Rate Region Enhancement in Multiple Access Wiretap Channel
    Autorzy:
    Shah, Shahid Mehraj
    Powiązania:
    https://bibliotekanauki.pl/articles/2142307.pdf
    Data publikacji:
    2022
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    multiple access channels
    physical layer security
    strong secrecy
    wiretap channel
    Opis:
    It is commonly known that physical layer security is achieved with a trade-off in terms of the achievable rate. Hence, security constraints generate rate losses in wiretap channels. To mitigate such rate losses in multi-user channels, we propose a coding/decoding scheme for multi-user multiple access wiretap channel (MAC-WT), where previously transmitted messages are used as a secret key to enhance the secrecy rates of the transmitting users, until the usual Shannon capacity region of a multiple access channel (MAC) is achieved without the secrecy constraint. With this coding scheme, all messages transmitted in the recent past are secure with respect to all the information of the eavesdropper till now. To achieve this goal, we introduce secret key buffers at both the users and the legitimate receiver. Finally, we consider a fading MAC-WT and show that with this coding/decoding scheme, we can achieve the capacity region of a fading MAC channel (in the ergodic sense).
    Źródło:
    Journal of Telecommunications and Information Technology; 2022, 2; 14--25
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Organized Economic Interests and European Integration: the Question of (neo)corporatism
    Autorzy:
    Ząbkowicz, Anna
    Powiązania:
    https://bibliotekanauki.pl/articles/517154.pdf
    Data publikacji:
    2014
    Wydawca:
    Instytut Badań Gospodarczych
    Tematy:
    economic interests
    channels of access
    European Union
    Opis:
    When economic development is considered, political economy is at stake; in this perspective growth or counter-growth forces operate within the institutional framework. The analysis focuses on corporatist forms of social dialogue in the international environment of the EU and within the European structures. First, the notion of corporatism as opposed to other institutionalized channels of access is explained. Then, the paper presents corporatist forms at the national level under change. Next, it deals with interest coordination at the European Commission level. The paper concludes that an erosion of corporatist forms is visible; no embracing pattern in the EU should be expected instead; on the contrary, increasing fragmentation of lobbying is observed.
    Źródło:
    Equilibrium. Quarterly Journal of Economics and Economic Policy; 2014, 9, 1; 7-20
    1689-765X
    2353-3293
    Pojawia się w:
    Equilibrium. Quarterly Journal of Economics and Economic Policy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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