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Wyszukujesz frazę "Chybicki, M." wg kryterium: Autor

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    Wyświetlanie 1-10 z 10
    Tytuł:
    The influence of low density behaviour of state equation on lattice inverted pair potential for lead
    Autorzy:
    Laskowski, R.
    Chybicki, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1954520.pdf
    Data publikacji:
    1999
    Wydawca:
    Politechnika Gdańska
    Tematy:
    lattice inversion technique
    pair potential
    molecular simulations
    Opis:
    A pair potential for lead (Pb) is extracted from the ab-initio energy-volume data using the lattice inversion procedure of Carlsson and co-workers [Phil. Mag. 41 (1980), p. 241]. Because of a limited accuracy of the ab-initio techniques, we extrapolate the energy-volume data for low-density systems with suitable analytical tail functions. We discuss the dependence of the molecular dynamics (MD) simulation structural results and the elastic modules on the choice of the cohesive energy tail function. The MD-simulated radial distribution functions (RDFs), obtained for several energy tails, in several temperatures are discussed.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 1999, 3, 3; 303-312
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Using phase of short-term Fourier transform for evaluation of spectrogram performance
    Autorzy:
    Czarnecki, K.
    Moszyński, M.
    Chybicki, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/331696.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    The concept of spectrogram performance evaluation which exploits information on phase of short-term Fourier transform (STFT) is presented. A spectrograph which is a timefrequency analyzing tool, is compared to a filter bank that demultiplexes a signal. Local group delay (LGD) and channelized instantaneous frequency (CIF) is obtained for each filtered component signal. In presented solution the performance is evaluated using so-called length of weighted average of reassignment vectors (WARV length). Orthogonal components of each reassignment vector are calculated using above mentioned parameters.
    Źródło:
    Hydroacoustics; 2011, 14; 23-28
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characterizing surface and air temperature in the Baltic Sea coastal area using remote sensing techniques and GIS
    Autorzy:
    Chybicki, A.
    Kulawiak, M.
    Łubniewski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/963420.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    remote sensing
    coastal zone
    AVHRR
    GIS
    surface temperature
    air temperature
    vegetation index
    Opis:
    Estimation of surface temperature using multispectral imagery retrieved from satellite sensors constitutes several problems in terms of accuracy, accessibility, quality and evaluation. In order to obtain accurate results, currently utilized methods rely on removing atmospheric fluctuations in separate spectral windows, applying atmospheric corrections or utilizing additional information related to atmosphere or surface characteristics like atmospheric water vapour content, surface effective emissivity correction or transmittance correction. Obtaining accurate results of estimation is particularly critical for regions with fairly non-uniform distribution of surface effective emissivity and surface characteristics such as coastal zone areas. The paper presents the relationship between retrieved land surface temperature, air temperature, sea surface temperature and vegetation indices (VI) calculated based on remote observations in the coastal zone area. An indirect comparison method between remotely estimated surface temperature and air temperature using LST/VI feature space characteristics in an operational Geographic Information System is also presented.
    Źródło:
    Polish Maritime Research; 2016, 1; 3-11
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Compression algorithms for multibeam sonar records
    Autorzy:
    Chybicki, A.
    Moszyński, M.
    Poćwiardowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/331502.pdf
    Data publikacji:
    2008
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Tematy:
    compression algorithms
    sonar records
    hydroacoustics
    Opis:
    Operational requirements of multibeam sonar systems result in very large volumes of datasets stored on local hard drives of operator's station. In this context, the process of archiving acquired data becomes a crucial problem. The paper investigates various lossy and lossless compression methods that can be applied to multibeam sonar data to reduce the size of acquired files without loosing relevant information. The specific character of MBS data allows applying various signal, image and video compression methods to achieve better results than when using standard compression tools. Various techniques of reordering the data were analyzed to achieve best possible compression ratio.
    Źródło:
    Hydroacoustics; 2008, 11; 55-62
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Using wavelet techniques for multibeam sonar bathymetry data compression
    Autorzy:
    Chybicki, A.
    Łubniewski, Z.
    Moszyński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/331892.pdf
    Data publikacji:
    2010
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    Multibeam sonars are widely used in applications like high resolution bathymetry measurements or underwater object imaging. One of the significant problems in multibeam sensing of the marine environment is large amount of data which must be transmitted from the sonar processing unit to an operator station using a limited bit rate channel. For instance, such a situation would be in the case when the multibeam sonar was mounted on the autonomous underwater vehicle operating on large depths and transmitting the data to the operator station using acoustic channel. In this context, the authors propose a method for multibeam sonar data size reduction. It relies on the use of wavelet decomposition technique combined with run-length and Huffman coding. The method was applied for lossy compression of raw bathymetry data which had been generated by a multibeam sonar processing unit in a form of a set of points in three-dimensional space. The performed tests revealed that without introducing the substantial distortion into the processed bathymetry data, the proposed approach allows to obtain better compression ratios than in the case of using standard lossy JPEG-like compression techniques.
    Źródło:
    Hydroacoustics; 2010, 13; 31-38
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A novel method for archiving multibeam sonar data with emphasis on efficient record size reduction and storage
    Autorzy:
    Moszynski, M.
    Chybicki, A.
    Kulawiak, M.
    Lubniewski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/260572.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    sonar
    compression
    storage
    reduction
    efficiency
    Opis:
    Over the past few years considerable advances in sonar technology, spatial positioning capabilities and computer processing power have lead to significant improvements in mapping, imaging and technologies of seafloor exploration. Recently, modern multibeam echosounder systems (MBES) capable of recording backscatter data for the whole water column, not just for the seabed, have become available thus providing data allowing for visualization and analysis of objects other than the seabed such as single fish, fish schools or pollution. Unlike bathymetric sonars, which only capture the seafloor, multibeam systems produce very large amounts of data during surveys. Because of this, storing the data collected during hydrographic or scientific cruises becomes a crucial problem. In this context, the paper proposes a new approach for efficient reduction and storage of MBES records. The results of a sample implementation of the algorithm being tested on several different sets of MBES data are also discussed.
    Źródło:
    Polish Maritime Research; 2013, 1; 77-86
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Genetic diversity of Dactylorhiza incarnata (Orchidaceae) in northern Poland
    Autorzy:
    Naczk, A.M.
    Chybicki, I.J.
    Zietara, M.S.
    Powiązania:
    https://bibliotekanauki.pl/articles/57961.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Opis:
    The genetic structure of Dactylorhiza incarnata var. incarnata populations is shaped not only by historical events such as recolonization after ice sheet retreat or limited seed and pollen dispersal, but also the bottleneck effect. During the last decade, D. incarnata var. incarnata has also experienced a strong decline in population numbers and sizes, due to habitat loss and fragmentation. In the present research genetic diversity was examined in eight populations located in northern Poland, using six nuclear microsatellites loci. At the species level our results showed a moderate mean level of genetic diversity (A = 4.67; Ae = 2.73; Rs = 4.48; Ho = 0.438; FIS = 0.224), which varied among the studied populations (A: 2.17–3.67; Ae: 1.55–2.69; Rs: 1.31–1.61; Ho: 0.292–0.631; FIS: −0.283–0.340). A considerable overabundance of homozygotes was detected in four populations (FIS within the range of 0.067–0.340), and in the remaining populations an excess of heterozygotes was observed. The average apparent out-crossing rate was also calculated (ta = 0.980), and primarily indicated a tendency to out-cross within the species. Moderate genetic differentiation was found among the studied populations (FST = 0.149; RST = 0.174; p < 0.05). The differentiation of the populations corresponded to relatively low gene flow value (Nm = 0.426) among populations, which amounted to only one migrant every second generation.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2016, 85, 2
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    3D imaging software tools for multibeam sonar data
    Autorzy:
    Bikonis, K.
    Moszyński, M.
    Chybicki, A.
    Kociński, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/332201.pdf
    Data publikacji:
    2006
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    Nowadays, the techniques for 3D computer graphics are developing dynamically. They are finding application not only for creating computer games, but often for three-dimensional data visualization systems. Applying these techniques make graphical operations more effective and consequently these systems are more efficient. The paper presents the system for 3D seafloor visualization using multibeam sonar data. In the presented system three programming techniques for 3D graphic were used C++ OpenGL, Java3D, Java OpenGL. The problems related to the system development and the ways of its solution are presented.
    Źródło:
    Hydroacoustics; 2006, 9; 17-22
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Algorytmy analizy, przetwarzania i wizualizacji danych z sonaru wielowiązkowego w rozproszonych systemach GIS
    Analysis, processing and visualization algorithms for mutlibeam sonar data in distributed GIS systems
    Autorzy:
    Chybicki, A.
    Kulawiak, M.
    Kamiński, Ł.
    Łubniewski, Z.
    Dąbrowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/366246.pdf
    Data publikacji:
    2009
    Wydawca:
    Polskie Towarzystwo Medycyny i Techniki Hiperbarycznej
    Tematy:
    systemy wielowiązkowe
    echosonda
    telemonitoring morski
    multibeam systems
    sonar
    seas and ocean monitoring and sensing
    Opis:
    Katedra Systemów Geoinformatycznych prowadzi badania naukowe związane z zastosowaniem nowych technologii implementacji Systemów Informacji Przestrzennej (GIS) w różnych zastosowaniach, a szczególnie w aplikacjach związanych z obszarami morskimi. Prowadzone są też prace badawcze związane z analizą i przetwarzaniem danych dla systemów GIS, ze szczególnym uwzględnieniem danych otrzymywanych z sonarów wielowiązkowych. Niniejszy artykuł stanowi ogólny opis prac badawczych związanych z telemonitoringiem morskim prowadzonych w Katedrze Systemów Geoinformatycznych Politechniki Gdańskiej.
    Research carried out by The Department of Geoinformatics of Gdansk University of Technology focuses on processing, analysis and visualization of information related to marine and land environment. In particular, the research activities include: Web-based interactive Geographical Information Systems (GIS), 3D imaging of underwater objects using intelligent methods of recognition and mapping of seafloor, acoustic monitoring and population assessment of marine living resources. This paper describes the most important directions of the Department's research activity in the context of marine habitat monitoring.
    Źródło:
    Polish Hyperbaric Research; 2009, 1(26); 19-26
    1734-7009
    2084-0535
    Pojawia się w:
    Polish Hyperbaric Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Geographic information system for remote integration of diverse under-water acoustic sensor data
    Autorzy:
    Chybicki, A.
    Kamiński, Ł.
    Lubniewski, Z.
    Bruniecki, K.
    Kulawiak, M.
    Dąbrowski, J.
    Moszyński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/332542.pdf
    Data publikacji:
    2009
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Tematy:
    geographic information system (GIS)
    acoustic sensor data
    under-water acoustic
    Opis:
    Maritime and port areas throughout the world are exposed to many different hazards, like pollution, terrorism and natural disasters. Early detection, identification and preparation of appropriate response strategies is especially important in the case of semi-enclosed basins like the Baltic Sea, mainly due to the marine ecosystems' continuous absorption of pollutants including oil, heavy metals and chemicals. Many of those agents are characterised by great toxicity and cause devastation of the natural environment. The huge development in the information technology provides the means and possibilities for much faster and more efficient access to survey data, allowing their remote, nearly real-time management, processing and visualisation. Several approaches and techniques of measurements are available in marine environment monitoring. These consist of direct sampling, airborne and satellite imagery, hydrological measurements using CTD probes, remote sensing with the use of electromagnetic waves, acoustic methods based on the data acquired by multibeam systems, side-scan sonars and singlebeam echosounders.
    Źródło:
    Hydroacoustics; 2009, 12; 17-24
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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