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    Wyświetlanie 1-4 z 4
    Tytuł:
    Fast high-impedance spectroscopy method using sinc signal excitation
    Autorzy:
    Kowalewski, M.
    Lentka, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/220740.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    impedance spectroscopy
    sinc signal
    Fourier transform
    impedance analyzer
    Opis:
    In this paper the method of fast impedance spectroscopy of technical objects with high impedance (|Zx| ≥ 1 GΩ) is evaluated by means of simulation and a practical experiment. The method is based on excitation of an object with a sinc signal and sampling the response signals proportional to current flowing through and voltage across the measured impedance. The object’s impedance spectrum is obtained with the use of continuous Fourier transform on the basis of linear approximations between samples in two acquisition sections, connected with the duration of the sinc signal. The method is first evaluated in MATLAB by means of simulation. An influence of the sinc signal duration and the number of samples on impedance modulus and argument measurement errors is explored. The method is then practically verified in a constructed laboratory impedance spectroscopy measurement system. The obtained acceleration of impedance spectroscopy in the low frequency range (below 1 Hz) and the decrease of the number of acquired samples enable to recommend the worked out method for implementation in portable impedance analyzers destined for operation in the field.
    Źródło:
    Metrology and Measurement Systems; 2013, 20, 4; 645-654
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Transport of Fine Sediments in MarineWaterbodies Near River Mouths: Preliminary Results
    Autorzy:
    Cerkowniak, G. R.
    Kowalewski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/241317.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
    Tematy:
    SPM
    flocculation
    sediment transport models
    turbulence
    Opis:
    Transport of fine sediments depends mainly on the efficiency of flocculation. Flocculation, understood as the result of simultaneous processes of aggregation of particles and floc break-up, is a common phenomenon in marine environments. It is typical of fine sediments. This study presents a mathematical model of fine sediment transport. A model of flocculation is an important part of this model. Its main assumption is that flocculation is governed by turbulence. The model was qualitatively tested in a simplified theoretical waterbody. Such factors as the wind direction, wind speed, river discharge and concentration of suspension in the river were investigated. The results show that the proposed model describes reasonably well the lithodynamic processes characteristic of fine flocculating sediments. Thus it seems possible to apply it for description of fine sediment transport under real wave–current conditions that occur in many marine waterbodies near river mouths.
    Źródło:
    Archives of Hydro-Engineering and Environmental Mechanics; 2018, 65, 4; 255-275
    1231-3726
    Pojawia się w:
    Archives of Hydro-Engineering and Environmental Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Charakterystyki i obszary zastosowań telekomunikacyjnych usług multimedialnych
    Characteristics and application fields of telecommunication multimedia services
    Autorzy:
    Gut-Mostowy, H.
    Kowalewski, M.
    Bujnowski, P.
    Półrola, M.
    Szczurek, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/317462.pdf
    Data publikacji:
    2002
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    usługi multimedialne
    wideotelefonia
    wideotekst
    interaktywna prezentacja audiowizualna
    wideokonferencja
    telekonferencja audiograficzna
    prognozy
    zapotrzebowanie
    multimedia
    multimedia services
    categories and models of services
    demand prognoses
    bandwidth and network requirements
    Opis:
    Przedstawiono modele i omówiono charakterystyki funkcjonalne pięciu standaryzowanych kategorii telekomunikacyjnych usług multimedialnych, takich jak: wideotelefonia, wideotekst, interaktywna prezentacja audiowizualna, wideokonferencja i telekonferencja audiograficzna. Dla każdej z opisanych kategorii usług określono potencjalne obszary zastosowań, wskazano jej najbardziej popularne aplikacje i zaprezentowano prognozy zapotrzebowania na te aplikacje. Ponadto dla każdej z tych aplikacji podano wymagania dotyczące pasma i inne uwarunkowania sieciowe.
    In the paper, selected adaptation methods of subscriber access networks for the needs of information society of XXI century, connected with implementation of the broadband services, such as: videophone, videotext, interactive audiovisual presentation, videoconference and audiography teleconference are described. Presented review was limited only to the techniques using copper (xDSL technologies), fiber (FITL technologies) cables and also low voltage electricity lines (DPL technology) as a transmission medium.
    Źródło:
    Telekomunikacja i Techniki Informacyjne; 2002, 1-2; 19-40
    1640-1549
    1899-8933
    Pojawia się w:
    Telekomunikacja i Techniki Informacyjne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Biotic interaction between spionid polychaetes and bouchardiid brachiopods: Paleoecological, taphonomic and evolutionary implications
    Autorzy:
    Rodrigues, S.C.
    Simoes, M.G.
    Kowalewski, M.
    Petti, M.A.V.
    Nonato, E.F.
    Martinez, S.
    del Rio, C.J.
    Powiązania:
    https://bibliotekanauki.pl/articles/21792.pdf
    Data publikacji:
    2008
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    biotic interaction
    spionid polychaete
    polychaete
    bouchardiid brachiopod
    brachiopod
    paleoecology
    evolution
    Brachiopoda
    Spionidae
    Caulostrepsis
    Bouchardia
    Cenozoic
    Brazil
    Opis:
    Shells of Bouchardia rosea (Brachiopoda, Rhynchonelliformea) are abundant in Late Holocene death assemblages of the Ubatuba Bight, Brazil, SW Atlantic. This genus is also known from multiple localities in the Cenozoic fossil record of South America. A total of 1211 valves of B. rosea, 2086 shells of sympatric bivalve mollusks (14 nearshore localities ranging in depth from 0 to 30 m), 80 shells of Bouchardia zitteli, San Julián Formation, Paleogene, Argentina, and 135 shells of Bouchardia transplatina, Camacho Formation, Neogene, Uruguay were examined for bioerosion traces. All examined bouchardiid shells represent shallow−water, subtropical marine settings. Out of 1211 brachiopod shells of B. rosea, 1201 represent dead individuals. A total of 149 dead specimens displayed polychaete traces (Caulostrepsis). Live polychaetes were found inside Caulostrepsis borings in 10 life−collected brachiopods, indicating a syn−vivo interaction (Caulostrepsis traces in dead shells of B. rosea were always empty). The long and coiled peristomial palps, large chaetae on both sides of the 5th segment, and flanged pygidium found in the polychaetes are characteristic of the polychaete genus Polydora (Spionidae). The fact that 100% of the Caulostrepsis found in living brachiopods were still inhabited by the trace−making spionids, whereas none was found in dead hosts, implies active biotic interaction between the two living organisms rather than colonization of dead brachiopod shells. The absence of blisters, the lack of valve/site stereotypy, and the fact that tubes open only externally are all suggestive of a commensal relationship. These data document a new host group (bouchardiid rhynchonelliform brachiopods) with which spionids can interact (interestingly, spionid−infested sympatric bivalves have not been found in the study area despite extensive sampling). The syn−vivo interaction indicates that substantial bioerosion may occur when the host is alive. Thus, the presence of such bioerosion traces on fossil shells need not imply a prolonged post−mortem exposure of shells on the sea floor. Also, none of the Paleogene and Neogene Bouchardia species included any ichnological evidence for spionid infestation. This indicates that the Spionidae/ Bouchardia association may be geologically young, although the lack of older records may also reflect limited sampling and/or taphonomic biases.
    Źródło:
    Acta Palaeontologica Polonica; 2008, 53, 4
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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