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    Wyświetlanie 1-3 z 3
    Tytuł:
    Adaptive telecommunications modems techniques for use in underwater communication systems
    Autorzy:
    Budzińska, I.
    Lasota, H.
    Mazurek, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/331551.pdf
    Data publikacji:
    2003
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Tematy:
    hydroacoustics
    underwater communication systems
    data transmission
    Opis:
    Underwater channel data transmission is one of telecommunications most difficult problems. One way to optimise the transmission may be by adapting transmission techniques used in telecommunications modems. The articles presents two ITU-T standards: V.34 and G.992.1, known as ADSL. The possibilities and limitations of these techniques for underwater communication systems are discussed. The ADSI standard using the DMT modulation seems to be the best.
    Źródło:
    Hydroacoustics; 2003, 6; 285-292
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Detection on broadband signals in the field of aperture and array systems
    Autorzy:
    Mazurek, R.
    Lasota, H.
    Budzińska, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/332465.pdf
    Data publikacji:
    2003
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Tematy:
    acoustics
    broadband signals
    array systems
    Opis:
    Antennas and antenna arrays in low band underwater systems introduce significant linear distortions that affect the detection of broadband signals. The article gives an analysis of the distortions using the space-time impulse response method. The signal received at different directions is subjected to two types of filtration, one matched to the transmitted signal and another one matched to the distorted signal. For the purpose of the simulation the Matlab software was used. Detection performance can be greatly enhanced, if receiver design takes account of the distortions.
    Źródło:
    Hydroacoustics; 2003, 6; 275-284
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Skuteczność rekultywacji jeziora Jelonek na podstawie wybranych fizycznych i chemicznych parametrów wody
    Effectiveness of the Reclamation of Jelonek Lake Based on Selected Physical and Chemical Parameters of Water
    Autorzy:
    Berleć, K.
    Traczykowski, A.
    Budzińska, K.
    Szejniuk, B.
    Michalska, M.
    Jurek, A.
    Tarczykowska, M.
    Klimczak, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1819097.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    rekultywacja jeziora Jelonek
    parametry wody
    Lake Jelonek
    water parameters
    Opis:
    Taking a decision about a modification of elements making up the ecosystem requires thorough knowledge about the manipulated system and predicting all possible results of such interference. Turning back the effects of anthropopression demands taking immediate action not only within the lake basin in the form of technological remediation measures. Primarily, these should be protective action, involving the organization of water supply and sewage disposal in the basin and (which is much more difficult) reduction of biogenic substance flow to the lake. Remediation ventures have been applied throughout the world, not always with success. They are thought to be risky, long-term and demanding considerable financial outlays. For this reason, they must be carefully planned by a team of experts and conducted under permanent supervision. The article presents effects of restoration of lake Jelonek based on the analysis of water quality parameters. The lake has been completely degraded and reached the saprotrophic state due to discharge of domestic wastewater from the neighbouring living estate, and of agricultural. The lakes restoration was initiated by dosing of coagulants for sediment. The aim of the study carried out was the analysis of selected physical and chemical indicators in the waters of the lake Jelonek in Gniezno. In water samples taken from three points following parameters were determined: temperature, pH, nitrogen, nitrates, nitrites, ammonium nitrogen, phosphorus and phosphates. Measurements were conducted since October 2010 till may 2011, regularly once a month. The water was taken in the current on depth of 20 cm. The temperature and pH of the water were characteristic for the studied seasons and had no significant impact on the content of nutrients. The result of carrying out restoration lakes and tributary pollution mitigation procedures was to reduce the amount of nitrite and total phosphorus. Treatments conducted on lake Jelonek not bring the expected improvement in terms of total nitrogen content, nitrate and phosphate.
    Źródło:
    Rocznik Ochrona Środowiska; 2013, Tom 15, cz. 2; 1336-1351
    1506-218X
    Pojawia się w:
    Rocznik Ochrona Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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