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    Wyświetlanie 1-7 z 7
    Tytuł:
    Development of fracture processes in Silesian Carboniferous sandstones
    Autorzy:
    Łukaszewski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059621.pdf
    Data publikacji:
    2003
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    fracture process
    relation stress-strain
    acoustic emission
    post-failure stage
    Opis:
    The development of fracture processes in selected Carboniferous rocks from the Upper Silesian Coal Basin is described, with particular regard to the behaviour of rock specimens in the post-failure stage. The fracture processes were monitored using the stress-strain relations, coupled with acoustic emission, recorded during loading. Energy accumulation and dissipation phenomena were observed during rock loading. Cracking was recorded on the stress-strain curves as deformation loops, accompanied by significant stress decreases, and as cyclic increases in acoustic emission activity. Observing and analysing stages of high acoustic emission and stress drops enabled determination of three ways ("schemes") in which fracture originated and developed during the post-critical stage. Scheme I is damage and movement of grains and rock cement, scheme II is destruction of single rock grains of particular resistance, and scheme III is a dislocational and slide deformation of the rock medium.
    Źródło:
    Geological Quarterly; 2003, 47, 1; 29-38
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of the de-icing salt on the deterioration of rock materials used in monumental buildings
    Autorzy:
    Kłopotowska, A. K.
    Łukaszewski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/178339.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    osadzanie się soli
    odladzanie
    sól drogowa
    surowce skalne
    budynki
    piaskowce
    budowle zabytkowe
    de-icing
    road salt
    rock materials
    buildings
    salt deposition
    sandstone
    Opis:
    The de-icing salt has been used for decades to increase safety on the roads and sidewalks. In Poland, mainly the sodium chloride is used in order to maintain the roads in good condition during winter. Like other salts used for surface de-icing, it depresses the freezing point to lower temperatures and has an additional thermal effect by an exothermic reaction. However, this salt causes the accumulation of chlorides in the walls and stone buildings contributing to the deterioration of these facilities. The paper addresses the issue of the influence of salt solutions on the structure and geomechanical properties of rocks at negative temperatures. The study was conducted on the basis of cyclic tests which simulate complex action of both the negative temperature and the salty environment. The conditions for the tests were chosen so as to reflect the actual conditions of the winter in Poland. During the tests, the longitudinal wave propagation velocity, changes in weights of the samples as well as visual changes were recorded which allowed continuous tracking of occurring changes. At the end of the tests, the rock samples were subjected to uniaxial compressive tests. For this purpose, four lithological types were chosen, representing the sedimentary rocks: clastic and carbonate, widely used in stone constructions.
    Źródło:
    Studia Geotechnica et Mechanica; 2013, 35, 3; 57-68
    0137-6365
    2083-831X
    Pojawia się w:
    Studia Geotechnica et Mechanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of the salt mist on the deterioration of rock materials
    Autorzy:
    Kłopotowska, A. K.
    Łukaszewski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/178515.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    resistance
    deterioration
    susceptibility
    salt mist
    mgła solna
    odporność
    podatność
    Opis:
    The paper is focused on changes of geomechanical properties with regard to loss of long-term resistance in studies on the influence of salt spray on the structure of selected rocks from Poland. The investigation has shown that the analyzed rock material shows variable susceptibility to this corrosive factor. The most susceptible to ageing by salt mist were Śmiłów sandstones, whose progressive deterioration was observed in subsequent cycles. Analysis of resistance parameters has shown decreased resistance to uniaxial compression exceeding 30% also in the case of the Józefów limestones. Limestones from Raciszyn have revealed high resistance to ageing by salt mist.
    Źródło:
    Studia Geotechnica et Mechanica; 2014, 36, 1; 37-45
    0137-6365
    2083-831X
    Pojawia się w:
    Studia Geotechnica et Mechanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of Rayleigh wave to diagnostics of degradation of historic construction materials
    Zastosowanie fali Raylegha do diagnostyki degradacji historycznych materiałów konstrukcyjnych
    Autorzy:
    Skłodowski, M.
    Pinińska, J.
    Łukaszewski, P.
    Bobrowska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/327984.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
    Tematy:
    modelowanie degradacji
    integralność materiału
    fala Rayleigha
    sonda ostrzowa
    materiał zabytkowy
    degradtion modeling
    material integrity
    Rayleigh wave
    edge probes
    historical materials
    Opis:
    Paper presents results of degradation modelling of historical construction materials based on Rayleigh surface wave velocity (CR) measurement for two marbles widely used as the structural and decorative material in historical constructions. Environmental loading is modelled by freezing and thawing cycles performed in laboratory. Rayleigh wave measurement method does not need any coupling medium between the stone and ultrasonic probe and is 100% non-destructive. It is shown that exponential law can be used to model the proces of degradation of elastic properties of the tested materials.
    Praca przedstawia wyniki modelowania degradacji historycznych materiałów konstrukcyjnych na podstawie pomiarów prędkości fali Rayleigha dla dwóch marmurów szeroko stosowanych w zabytkowych budowlach jako materiał konstrukcyjny i dekoracyjny. Obciążenia środowiskowe modelowane są cyklami zamrażania i rozmrażania przeprowadzonymi w laboratorium. Metoda pomiaru fali Rayleigha nie wymaga żadnego ośrodka sprzęgającego pomiędzy materiałem a sondą ultradźwiękową i jest w 100% nieniszcząca. Wykazano, że proces degradacji właściwości sprężystych badanych materiałów dobrze modeluje prawo wykładnicze.
    Źródło:
    Diagnostyka; 2011, 3(59); 19-24
    1641-6414
    2449-5220
    Pojawia się w:
    Diagnostyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Implementation and Analysis of Elliptic Curves-Based Cryptographic Algorithms in the Integrated Programming Environment
    Autorzy:
    Lukaszewski, R.
    Sobieszek, M.
    Bilski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/963936.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cryptography
    distributed measurement systems
    integrated programming environments
    Opis:
    The paper presents the implementation of the Elliptic Curves Cryptography (ECC) algorithms to ensure security in the distributed measurement system. The algorithms were deployed in the LabWindows/CVI environment and are a part of its cryptographic library. Their functionality is identical with the OpenSSL package. The effectiveness of implemented algorithms is presented with the comparison of the ECDSA against the DSA systems. The paper is concluded with future prospects of the implemented library.
    Źródło:
    International Journal of Electronics and Telecommunications; 2011, 57, 3; 257-262
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bivalve Characterization Using Synchrotron Micro X-Ray Fluorescence
    Autorzy:
    Jones, K.
    Bronson, S.
    Brink, P.
    Gordon, C.
    Mosher-Smith, K.
    Brown, M.
    Chaudhry, S.
    Rizzo, A.
    Sigismondi, R.
    Whitehurst, M.
    Lukaszewski, A.
    Kranz, D.
    Bland, K.
    Gordan, D.
    Lobel, J.
    Sullivan, J.
    Metzger, M.
    O'Shea, C.
    Harris, C.
    Arezzo, R.
    Kambhampati, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1808352.pdf
    Data publikacji:
    2009-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    01.40.-d
    07.85.Qe
    82.80.Ej
    87.59.-e
    Opis:
    Bivalves, oysters, mussels, and clams are important constituents of riverine and estuarine ecosystems. Their shells and soft tissues provide information on the environments in which they live. Since they are filter feeders, they also are factors in improving water quality through removal of particulate matter from the water column. Finally, they are a valuable food source that has substantial economic value. Hence, characterization of shells and soft tissues is useful for improved understanding of these factors. Here, we used X-ray microprobes and computed microtomography facilities at the Brookhaven National Synchrotron Light Source to investigate elemental distributions in bivalves taken from locations around New York, Washington, DC, and New Orleans, LA. The results form the initial basis for compilation of a database of relevant parameters that can serve for tracking environmental changes and for assessing toxicity of particular metals. The work was enabled by active collaboration with students from the several regions, community groups, and research scientists. The collaboration was facilitated through use of web conferencing between Brookhaven National Laboratory and the varied locations.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 2; 477-481
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dermacentor reticulatus (Fabricius, 1794) and Babesia canis (Piana et Galli-Valerio, 1895) as the parasites of companion animals (dogs and cats) in the Wroclaw area, south-western Poland
    Autorzy:
    Krol, N.
    Kiewra, D.
    Lonc, E.
    Janaczyk, B.
    Chodorowska-Skubiszewska, A.
    Dzieciol, M.
    Gola, M.
    Gruszka, R.
    Jackowska-Szlachcic, E.
    Jagiello, M.
    Kawski, S.
    Lukaszewski, Z.
    Mizgalski, P.
    Narajowska, T.
    Niedzielska, J.
    Noczynski, M.
    Rudkowska, M.
    Rzepka, D.
    Samulska, K.
    Senze, M.
    Sieczko, P.
    Silny, A.
    Staniewska, A.
    Stanczyk, J.
    Stanczyk, W.
    Stasiak, M.
    Wlodarczyk, M.
    Zimniak, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/6581.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Parazytologiczne
    Opis:
    Tests performed in 2013 and 2014 revealed the occurrence of three tick species parasitizing pet cats and dogs in the Wrocław Agglomeration. In total, 1,455 tick specimens were removed from 931 hosts (760 dogs and 171 cats) in 18 veterinary clinics. The dominant tick species was Ixodes ricinus (n=1272; 87.4%), followed by I. hexagonus (n=137; 9.4%) and Dermacentor reticulatus (n=46; 3.2%). Females were the most often collected development stage among I. ricinus and D. reticulatus, and nymphs among I. hexagonus. Additionally, D. reticulatus ticks (n=337) were then collected from vegetation in the Wrocław area to detect Babesia canis; however, none was found positive. Only 9.0% of dog blood samples sent to VETLAB were positive for Babesia spp. Negative results for B. canis from ticks may result from the short period of the occurrence of D. reticulatus in the Wrocław area and therefore the vectorpathogen cycle may not have been fully established at the time of the study. Nevertheless, D. reticulatus is expanding its range, and the size of its population in the Wrocław Agglomeration is increasing. The presence of the pathogenic Babesia spp. combined with the occurrence of its main vector¸ D. reticulatus, suggests that the epizootiological situation in the area can change and may pose a new veterinary problem in the future.
    Źródło:
    Annals of Parasitology; 2016, 62, 2
    0043-5163
    Pojawia się w:
    Annals of Parasitology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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