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    Wyświetlanie 1-7 z 7
    Tytuł:
    Rare weather phenomena and the work of large-format roof coverings
    Autorzy:
    Ksit, Barbara
    Szymczak-Graczyk, Anna
    Powiązania:
    https://bibliotekanauki.pl/articles/971031.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    wind load
    hurricane wind
    roof covering
    damage
    membrane
    sail effect
    obciążenie wiatrem
    huragan
    pokrycie dachu
    uszkodzenia
    membrana
    efekt żagla
    Opis:
    Wind action belongs to loads that are environmentally variable. Wind action is included in the basic combination of loads, whereas hurricane wind action is classified as a unique combination. Due to large gusts of wind, the roof coverings of large-scale buildings are exposed to detachment of their cover layer. The article presents the effects of overnormative wind, which occurred on January 19, 2018 and was named the cyclone Frederic/David. The purpose of the article is to show that in design of roof coverings made of large-format materials, such as membranes, it is crucial to accept wind load values properly in order to ensure a right spacing between fasteners. The presented results might be an important contribution to the debate on the necessity for increasing the fundamental value of the basic wind velocity in the perimeter and corner zones of large-format roofs.
    Źródło:
    Civil and Environmental Engineering Reports; 2019, 29, 3; 123-133
    2080-5187
    2450-8594
    Pojawia się w:
    Civil and Environmental Engineering Reports
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Diagnostics and Renovation of Moisture Affected Historic Buildings
    Autorzy:
    Ksit, Barbara
    Szymczak-Graczyk, Anna
    Nazarewicz, Bogdan
    Powiązania:
    https://bibliotekanauki.pl/articles/27314713.pdf
    Data publikacji:
    2022
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    historic buildings
    diagnostics of masonry
    technological moisture
    drainage of masonry
    renovation
    non-invasive methods
    invasive method
    budynki zabytkowe
    ocena murów
    zawilgocenie
    osuszanie murów
    renowacja
    metody nieinwazyjne
    metoda inwazyjna
    Opis:
    The work concerns issues related to the diagnostics of moisture in historic buildings. Moisture content is one of the basic physical properties of materials. Excessive and undesirable growth of moisture in masonry causes considerable damage to masonry wall assemblies. It reduces the load-bearing capacity of structural elements, causes difficulties with heating and contributes to the development of mould and fungi. The article describes diagnostic procedures, provides available drying methods for walls in buildings and the applied method of renovation based on the example of damage caused by moisture in an examined historic facility.
    Źródło:
    Civil and Environmental Engineering Reports; 2022, 32, 1; 59--73
    2080-5187
    2450-8594
    Pojawia się w:
    Civil and Environmental Engineering Reports
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multi-criteria diagnostics of historic buildings with the use of 3D laser scanning (a case study)
    Autorzy:
    Szymczak-Graczyk, Anna
    Walczak, Zbigniew
    Ksit, Barbara
    Szyguła, Zdzisław
    Powiązania:
    https://bibliotekanauki.pl/articles/2173661.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    laser scanning
    diagnostics
    historic buildings
    limit state method
    beam deflection
    mycological test
    skanowanie laserowe
    diagnostyka
    budynek historyczny
    metoda stanów granicznych
    ugięcie belki
    test mikologiczny
    Opis:
    The protection and use of historic buildings is a difficult and costly task. Most often, these objects are under conservatory protection and any interference in their structure requires appropriate consent. On the other hand, conducting construction works on historic buildings carries a high risk of their damage or even destruction. Therefore, proper prior diagnostics is an extremely important factor affecting the scope and manner of works to be conducted. The paper presents the use of 3D scanning to determine the deflection of the ceiling under the Column Hall of the historic Palace, the floor of which showed elasticity, recorded during changing service loads. After identifying the places with the greatest deflections, based on data from 3D laser scanning, test holes were made and wood samples from the ceiling were taken to perform moisture content and mycological tests. An endoscopic inspection camera was inserted into test holes, providing the basis for recognizing the structure of the ceiling, i.e. arrangement of layers as well as dimensions and spacing of ceiling beams. Strength calculations were made with the limit state method resulted in the determination of the maximum permissible service load on the ceiling. The presented course of action in diagnostics of the analysed historic building may be an example of a preliminary procedure to be taken before deciding on changes in the manner of use of historic buildings or the functionalities of their individual parts.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2022, 70, 2; art. no. e140373
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Feasibility Analysis Regarding the Manner of Development of the Former Edmund Szyc Stadium Area in Poznań
    Autorzy:
    Walczak, Zbigniew
    Topolińska, Magdalena
    Walczak, Natalia
    Laks, Ireneusz
    Szymczak-Graczyk, Anna
    Powiązania:
    https://bibliotekanauki.pl/articles/2069939.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    multi-criteria analysis
    AHP
    MAUT
    PROMETHEE II
    sports facility
    spatial development
    sensitivity analysis
    revitalisation
    Opis:
    The paper presents a feasibility analysis of changes in the manner of development a former sports facility, Edmund Szyc Stadium in Poznań. The terrain and adjacent areas were inventoried, including the assessment of inter-area relationships. Based on the inventory and authors' surveys, three developmental variants were selected for further analysis. Particular attention was paid to the purpose of the area in the local zoning plan (local spatial development plan) and the preferences of its local community. A multi-criteria analysis carried out with three different methods – AHP, MAUT and PROMETHEE II indicated the second variant as optimal. Additionally, the authors performed a sensitivity analysis of the AHP method to determine the weight of adopted criteria. This allowed for observing what impact these changes had on the final result. The sensitivity analysis was performed only for 3 main groups of criteria. The implementation of activities planned in the concept will allow for optimal land development, improvement in functionality as well as improvement in visual and landscape characteristics of the city.
    Źródło:
    Rocznik Ochrona Środowiska; 2021, 23; 11--22
    1506-218X
    Pojawia się w:
    Rocznik Ochrona Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Photodynamic effect of protoporphyrin diarginate (PPArg2) on methicillin-resistant Staphylococcus aureus and human dermal fibroblasts
    Autorzy:
    Grinholc, Mariusz
    Kawiak, Anna
    Kurlenda, Julianna
    Graczyk, Alfreda
    Bielawski, Krzysztof
    Powiązania:
    https://bibliotekanauki.pl/articles/1040819.pdf
    Data publikacji:
    2008
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    cytotoxicity
    antimicrobial photodynamic inactivation
    MRSA
    fibroblasts
    phototoxicity
    Opis:
    The worldwide rise in the antibiotic resistance of bacteria forces the development of alternative antimicrobial treatments. A potential approach is photodynamic inactivation (PDI). The aim of the present study was to determine the phototoxicity of protoporphyrin diarginate (PPArg2) against methicillin-resistant Staphylococcus aureus and human dermal fibroblasts. Different concentrations (0 to 20 µM) of PPArg2 and light dose of 6 J cm-2 were tested. Cell viability was evaluated using the methylthiazoletetrazolium (MTT) assay. Incubation with 10 µM followed by illumination yielded a 3.6 log10-unit reduction in the viable count for Staphylococcus aureus. At the same experimental conditions, only 22.5% of the fibroblasts were photoinactivated. Protoporphyrin diarginate at concentrations up to 20 µM demonstrated no toxicity towards S. aureus or fibroblasts when not irradiated. These results suggest that the protoporphyrin diarginate exerts a high bactericidal effect against methicillin-resistant S. aureus strain without harming eukaryotic cells.
    Źródło:
    Acta Biochimica Polonica; 2008, 55, 1; 85-90
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of electrophoretic methods for detection of protein-porphyrin complexes.
    Autorzy:
    Kowalska, Agnieszka
    Kwiek, Piotr
    Miłosz, Ewa
    Gondek, Grzegorz
    Romiszewska, Anna
    Graczyk, Alfreda
    Podhajska, Anna
    Powiązania:
    https://bibliotekanauki.pl/articles/1043407.pdf
    Data publikacji:
    2003
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    porphyrins
    photodynamic therapy
    PDT
    electrophoresis
    Opis:
    Simple methods for detection and isolation of protein-porphyrin complexes were elaborated in our laboratory. They are based on the separation of protein-porphyrin complexes in native polyacrylamide gel and measurement of their fluorescence, with the use of two detection systems: the commercially available Gel DocTM 2000 system, and a system specially designed for the purpose of these investigations, concerning protein-porphyrin interactions. The fluorescent complexes can be electro-transferred from the gel onto PVDF membrane, eluted and analyzed in order to identify the protein interacting with porphyrins.
    Źródło:
    Acta Biochimica Polonica; 2003, 50, 4; 1155-1163
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cytotoxicity of PP(Arg)2- and Hp(Arg)2-mediated photodynamic therapy and early stage of apoptosis induction in prostate carcinoma in vitro
    Autorzy:
    Nowak-Stępniowska, Agata
    Wiktorska, Katarzyna
    Małecki, Maciej
    Romiszewska, Anna
    Padzik-Graczyk, Alfreda
    Powiązania:
    https://bibliotekanauki.pl/articles/1039837.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    confocal microscopy
    PDT
    prostate carcinoma
    Opis:
    Porphyrin photosensitizers tend to localize in mitochondria. The depolarization of mitochondrial membrane is one of the early stages of apoptosis and Laser Scanning Fluorescence Microscopy allows to determine changes in transmembrane mitochondrial potential under influence of PDT depending on the kind of photosensitizer (PP(Arg)2, Hp(Arg)2), the energy dose (5, 10, 30 and 50 J/cm2) and time periods (24 and 48 hours after irradiation) in the LNCaP (lymphonodal metastasis of prostate carcinoma, the androgen dependent cell line). Cyototoxicity induced by PP(Arg)2- and Hp(Arg)2-based PDT depending on energy dose and time after irradiation in prostate carcinoma is determined with MTT. Generally, it was shown that lower energy doses induce greater changes in transmembrane mitochondrial potential. Hp(Arg)2-based PDT was more effective causing greater mitochondrial membrane depolarization and cell viability decrease in comparison to PP(Arg)2-mediated PDT (in the case of maximal nontoxic photosensitizer doses used).
    Źródło:
    Acta Biochimica Polonica; 2011, 58, 4; 497-505
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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