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    Tytuł:
    An analytical and numerical approach to a bilateral contact problem with nonmonotone friction
    Autorzy:
    Barboteu, M.
    Bartosz, K.
    Kalita, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/330898.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    linearly elastic material
    bilateral contact
    nonmonotone friction law
    hemivariational inequality
    finite element method
    error estimate
    nonconvex proximal bundle method
    quasi augmented Lagrangian method
    Newton method
    metoda elementów skończonych
    szacowanie błędu
    metoda Lagrangiana
    metoda Newtona
    Opis:
    We consider a mathematical model which describes the contact between a linearly elastic body and an obstacle, the so-called foundation. The process is static and the contact is bilateral, i.e., there is no loss of contact. The friction is modeled with a nonmotonone law. The purpose of this work is to provide an error estimate for the Galerkin method as well as to present and compare two numerical methods for solving the resulting nonsmooth and nonconvex frictional contact problem. The first approach is based on the nonconvex proximal bundle method, whereas the second one deals with the approximation of a nonconvex problem by a sequence of nonsmooth convex programming problems. Some numerical experiments are realized to compare the two numerical approaches.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2013, 23, 2; 263-276
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of the innovation effects implementation for firms’ competitiveness in the sector of small and medium enterprises in Poland on the example of the małopolska province
    Autorzy:
    Zuzek, Dagmara K.
    Mickiewicz, Bartosz
    Powiązania:
    https://bibliotekanauki.pl/articles/326441.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    innovation
    competitiveness
    small and medium enterprises
    innowacja
    konkurencyjność
    małe i średnie przedsiębiorstwa
    Opis:
    One of the sources of low competitiveness of small and medium-sized enterprises (SMEs) is the relatively small ability to generate innovations. In view of the depletion of such sources of competitiveness in Poland as labour costs or the adaptation of external technologies, the low level of enterprise innovation is becoming a challenge. The system of supporting competitiveness and innovativeness in the SME sector must take into account the problem of insufficient capital for innovative activity - therefore, direct support should remain a key policy tool in the area of supporting innovation. The aim of the article is to assess the effects of innovation implementation by enterprises from the SME sector on the example of the Małopolska province. The authors focused mainly on the innovation activities planned by enterprises and on the sources of their financing, including subsidies for this purpose. The first stage, i.e. the selection of enterprises, was carried out in a targeted manner based on belonging to a separate SME sector. Then, in a random way, 262 enterprises were chosen from the database using the systematic selection. In order to obtain information, a method of in-depth interview using a questionnaire was used. This task was carried out using a categorized set of questions. The interview questionnaire allowed to gather information and numerical data in the following range: planning of the implementation of innovations, use of innovations in the company's development and sources of financing for the implementation of product, process or non-technological innovations.
    Źródło:
    Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska; 2019, 139; 657-675
    1641-3466
    Pojawia się w:
    Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of rotational motion in a reinforced concrete frame construction by a fiber optic gyroscope
    Autorzy:
    Kurzych, Anna T.
    Jaroszewicz, Leszek R.
    Kowalski, J. K.
    Sakowicz, Bartosz
    Powiązania:
    https://bibliotekanauki.pl/articles/1818251.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Tematy:
    rotational seismology
    fiber-optic rotational seismometer
    civil engineering
    sensors
    Opis:
    This paper deals with an issue of a rotational motion impact on a construction and presents civil engineering applications of a fiber optic rotational seismograph named Fiber-Optic System for Rotational Events & Phenomena Monitoring. It has been designed for a long- term building monitoring and structural rotations’ recording. It is based on the Sagnac effect which enables to detect one-axis rotational motion in a direct way and without any reference system. It enables to detect a rotation component in the wide range of a signal amplitude from 10-8 rad/s to 10 rad/s, as well as a frequency from DC to 1000 Hz. Data presented in this paper show the behavior of a reinforced concrete frame construction on different floors. Several measurements were carried out by placing the applied sensor on different floor levels of a building. The laboratory and in-situ measurements confirmed that Fiber-Optic System for Rotational Events & Phenomena Monitoring is an accurate and suitable device for applications in civil engineering.
    Źródło:
    Opto-Electronics Review; 2020, 28, 2; 69--73
    1230-3402
    Pojawia się w:
    Opto-Electronics Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multi-proxy inferred hydroclimatic conditions at Bęczkowice fen (central Poland); the influence of fluvial processes and human activity in the stone age
    Autorzy:
    Płóciennik, Mateusz
    Jakiel, Aleksandra
    Forysiak, Jacek
    Kittel, Piotr
    Płaza, Dominik K.
    Okupny, Daniel
    Pawłowski, Dominik
    Obremska, Milena
    Brooks, Stephen J.
    Kotrys, Bartosz
    Luoto, Tomi P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2037005.pdf
    Data publikacji:
    2021-12-23
    Wydawca:
    Łódzkie Towarzystwo Naukowe
    Tematy:
    peatland
    palaeoecology
    climate changes
    Late Weichselian
    Early Holocene
    central Poland
    Opis:
    Fens have been forming in the river valleys of central Poland since the Bølling and went through a transformation from fully aquatic to semiterrestrial habitats during the Younger Dryas/Holocene transition. This drove plant and invertebrate communities and left a distinct pattern in chemical sediment composition, which is why river valley peatlands are sensitive palaeo-archives of climatic, hydrological and edaphic changes. Here we reconstruct the Late Weichselian history of the Bęczkowice fen in the upper Luciąża River valley using geochemical, pollen, Cladocera and Chironomidae proxies. Pollen-based age estimation indicates that the analysed peat sequence dates from the Bølling to Early Holocene. The layers 190-170 cm and 125-105 cm of the studied core were reworked by fluvial processes. Chironomidae and Cladocera communities indicate mostly limnetic conditions during the Allerød and early Younger Dryas. Peatland pools were supplied mostly by Luciąża River floods, but also by groundwater. Since the onset of the Holocene, the water level has dropped, eliminating aquatic midges and water fleas, and supporting taxa typical of astatic waters and wet soil.
    Źródło:
    Acta Geographica Lodziensia; 2021, 111; 135-157
    0065-1249
    Pojawia się w:
    Acta Geographica Lodziensia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Changes in habitat conditions in a Late Glacial fluviogenic lake in response to climatic fluctuations (Warta River valley, central Poland)
    Autorzy:
    Forysiak, Jacek
    Okupny, Daniel
    Obremska, Milena
    Antczak-Orlewska, Olga
    Płóciennik, Mateusz
    Pawłowski, Dominik
    Baradyn, Daria
    Kotrys, Bartosz
    Luoto, Tomi P.
    Nevalainen, Liisa
    Borówka, Ryszard K.
    Powiązania:
    https://bibliotekanauki.pl/articles/13955341.pdf
    Data publikacji:
    2023
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    multi-proxy analysis
    Late Weichselian
    denudation processes
    palaeoclimate
    central European river
    Opis:
    The Warta River valley was greatly influenced by the ice sheet of the Last Glacial Maximum (LGM). A small peatland located in the Warta drainage system is here used as a palaeoarchive of climatic and habitat changes during the Late Glacial (Weichselian). The Ługi sediment profile was investigated using multi-proxy (pollen, Chironomidae, Cladocera and geochemistry) analyses that recorded changes in a fluviogenic sedimentary depression. After the Poznań Phase (LGM), Ługi functioned as an oxbow lake that was cut off from the active river channel as a result of fluvial erosion. Since that time, the Warta River has flowed only along the section now occupied by the Jeziorsko Reservoir. Sedimentation of lacustrine deposits started at the beginning of the Late Glacial. Summer temperature reconstructions indicate cool Oldest and Younger Dryas, but no clear cooling in the Older Dryas. During the Younger Dryas the palaeolake was completely occupied by a peatland (fen), which periodically dried out during the Holocene. Investigation of this site has tracked the reaction of the habitat to climatic, hydrological and geomorphological changes throughout the Late Weichselian.
    Źródło:
    Geological Quarterly; 2023, 67, 1; art. no. 1
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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