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    Wyświetlanie 1-7 z 7
    Tytuł:
    State of water in citrate crosslinked chitosan membrane
    Autorzy:
    Ostrowska-Czubenko, Jadwiga
    Pieróg, Milena
    Powiązania:
    https://bibliotekanauki.pl/articles/1035556.pdf
    Data publikacji:
    2010
    Wydawca:
    Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
    Tematy:
    DSC method
    chitosan membrane
    state of water
    trisodium citrate
    Opis:
    The ionically crosslinked membranes were prepared of chitosan (Ch) and trisodium citrate (Ch/CIT). The characteristics of the state of water in crosslinked and uncrosslinked chitosan membranes with different water content was performed by differential scanning calorimetry (DSC). The kinetics of water swelling in Ch and Ch/CIT membranes were also studied. Conclusions concerning effect of ionic crosslinking on the state of water in chitosan hydrogel membranes were drawn out. Results shows that freezable and non-freezable water exist in analysed Ch and Ch/CIT membranes, while there are variations in the amount of non-freezing bound water in these polymers.
    Źródło:
    Progress on Chemistry and Application of Chitin and its Derivatives; 2010, 15; 33-40
    1896-5644
    Pojawia się w:
    Progress on Chemistry and Application of Chitin and its Derivatives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling 3D steam turbine flow using thermodynamic properties of steam IAPWS-95
    Autorzy:
    Rusanow, A. V.
    Lampart, P.
    Pashchenko, N. V.
    Rusanov, R. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/258730.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    three-dimensional viscous flow
    steam turbine
    low-pressure cylinder
    sets of equations of state for water and steam IAPWS-95
    approximations of equations
    Opis:
    An approach to approximate equations of state for water and steam (IAPWS-95) for the calculation of three-dimensional flows of steam in turbomachinery in a range of operation of the present and future steam turbines is described. Test calculations of three-dimensional viscous flow in an LP steam turbine using various equations of state (perfect gas, Van der Waals equation, equation of state for water and steam IAPWS-95) are made. The comparison of numerical results with experimental data is also presented.
    Źródło:
    Polish Maritime Research; 2016, 1; 61-67
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Current state and prognoses of the structure of cargo transport on Polish and European inland water transport area
    Autorzy:
    Czermanska, R.
    Kowalczyk, U.
    Powiązania:
    https://bibliotekanauki.pl/articles/963458.pdf
    Data publikacji:
    2007
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    inland water transport
    Europe
    state
    flow of cargo
    potential for development
    Opis:
    The present report was prepared within the framework of research activities carried out in the Maritime Institute in Gdansk, when taking part in the international research project EUREKA E! 3065 INCOWATRANS, the goal of which was working out preliminary designs of new-generation ships for inland and coastal navigation, and preparing technical and economic structure for the revitalisation of inland waterways in Poland, with their further incorporation to the European transportation system. The article aims at analysing the present state and assessing the future potential of cargo routes observed in inland East-West water transport, i.e. between Poland and Western Europe countries.
    Źródło:
    Polish Maritime Research; 2007, S 1; 21-29
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Seasonal Variability of Selected Nutrients in the Waters of Lakes Niepruszewskie, Pamiatkowskie and Strykowskie
    Autorzy:
    Zbierska, A.
    Przybyła, C.
    Dwornikowska, Ż.
    Powiązania:
    https://bibliotekanauki.pl/articles/123772.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    accumulation of nutrients
    lake eutrophication
    nitrates(V)
    water pollution
    trophic state
    Opis:
    The paper presents the evaluation of seasonal and long-term changes in selected nutrients of three lakes of the Poznań Lakeland. The lakes were selected due to the high risk of pollution from agricultural and residential areas. Water samples were taken in 6 control points in the spring, summer and autumn, from 2004 to 2014. Trophic status of the lakes was evaluated based on the concentration of nutrients (nitrates, nitrites, ammonium, nitrogen and phosphorus) and indicators of eutrophication. Studies have shown that the concentration of nutrients varied greatly both in individual years and seasons of the analyzed decades, especially in Lakes Niepruszewskie and Pamiątkowskie. The main problem is the high concentration of nitrates. In general, it showed an upward trend until 2013, especially in the spring. This may indicate that actions restricting runoff pollution from agricultural sources have not been fully effective. On the other hand, a marked downward trend in the concentrations of NH4 over the years from 2004 to 2014, especially after 2007, indicates a gradual improvement of wastewater management. Moreover, seasonal variation in NH4 concentrations differed from those of NO3 and NO2. The highest values were reported in the autumn season, the lowest in the summer. Concentrations of nutrients and eutrophication indexes reached high values in all analysed lakes, indicating a eutrophic or hypertrophic state of the lakes. The high value of the N:P ratio indicates that the lakes had a huge surplus of nitrogen, and phosphorus is a productivity limiting factor.
    Źródło:
    Journal of Ecological Engineering; 2016, 17, 4; 129-137
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The concept of a methodology for assessment of programmes of measures in implementation of the Water Framework Directive 2000/60/EC
    Autorzy:
    Walczykiewicz, T.
    Biedroń, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/108520.pdf
    Data publikacji:
    2014
    Wydawca:
    Instytut Meteorologii i Gospodarki Wodnej - Państwowy Instytut Badawczy
    Tematy:
    programme of measure
    Water Framework Directive
    2000/60/EC
    State Water and Environment Programme
    SWEP
    Opis:
    This article presents the concept of the methodology for assessing the implementation of programmes of measures adopted in the State Water and Environmental Programme, and, in consequence, in the framework of the first water management plans for river basin districts in Poland, as approved by the Council of Ministers on 22nd February, 2011, and published in the official journals. The scope of work in the methodology concept primarily concerns two basic analyses: assessment of the accomplishment of programmes of measures with regard to the degree of their accomplishment, and assessment of the effectiveness of scheduled programmes of measures. The level of accomplishment should be understood as the quantitative status of progress of particular measures, whereas effectiveness means their direct or indirect impact on the achievement of environmental goals of the Water Framework Directive. For this purpose, for some of the measures databases and reports existing in institutions responsible for the performance of measures indicated in the SWEP were used. For the rest of the measures, the survey method was used. For the purpose of the surveying process, the preparation of appropriate matrixes with measures marked for institutions, and also of email address databases, were proposed. Also, identifiers serving to link answers with specific areas on maps that trace measures were proposed. The present and forecast situation concerning reporting in the scope of the WFD and other tasks connected with it in the field of environmental protection leads to the conclusion that the coordination of reporting at the state level and the improvement of the flow of information between interested institutions is necessary.
    Źródło:
    Meteorology Hydrology and Water Management. Research and Operational Applications; 2014, 2, 2; 15-22
    2299-3835
    2353-5652
    Pojawia się w:
    Meteorology Hydrology and Water Management. Research and Operational Applications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hydrochemical Indicators Dynamic in Surface Water
    Autorzy:
    Mitryasova, Olena
    Cieśla, Maksymilian
    Nosyk, Anastasia
    Mats, Andrii
    Powiązania:
    https://bibliotekanauki.pl/articles/1955476.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    surface water quality
    water security
    hydrochemical indicators
    regression analysis
    mathematical modeling
    forecast of the environment state
    Inhul river
    Opis:
    On the basis of the analysis of wide temporal monitoring data, a forecast of the integrated hydrochemical indicators of the waters of the Inhul river (Ukraine) was carried out. The performed analysis was also the basis for the determination of a mathematical model of natural fluctuations of the indicators studied. The determined sinusoidal dependence of the integrated water quality indicators allowed determining the average time of fluctuations concerning the processes of self-organisation of river waters. In practice, the developed mathematical models may constitute a valuable support and supplement to the existing models in the field of prediction of self-organization processes of river waters. They may also contribute to even more effective minimization of undesirable effects of anthropogenic impact on aquatic ecosystems.
    Źródło:
    Journal of Ecological Engineering; 2021, 22, 8; 111-122
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Operation preparation of the state territory and transport
    Autorzy:
    Krč, Miroslav
    Powiązania:
    https://bibliotekanauki.pl/articles/1384835.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Wydawnictwo Ekonomiczne
    Tematy:
    operation preparation of state territory
    road
    water transport
    rail transport
    przygotowanie operacyjne terytorium państwowego
    droga
    transport wodny
    transport kolejowy
    Opis:
    The paper titled Operational Preparation of the State Territory and Transport analyzes possible methods of operational preparation of the state territory by means of a descriptive method. It defines the continuity of operational preparation of the state territory to the infrastructure of the Czech Republic, it describes the place and importance of socio-technical infrastructure in the operational preparation of the territory, states the legislative standards under which construction is carried out. The directions of operational preparation of the area from the perspective of road, rail and water transport are described in detail. The paper recommends the process of operational preparation of the state territory not only from the point of view of possible state of war, but also from the point of view of non-military threats.
    Źródło:
    Gospodarka Materiałowa i Logistyka; 2019, 10; 321-329
    1231-2037
    Pojawia się w:
    Gospodarka Materiałowa i Logistyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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