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    Wyświetlanie 1-5 z 5
    Tytuł:
    Methods of Achieving Good GPR Image Resolution Using Focused SAR Processing
    Autorzy:
    Zych, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/226575.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    GRP
    LFM
    multilook
    mismatch shift
    Opis:
    The paper describes the simulation and measurement results for a ground penetrating SAR radar. The main purpose of this paper is to present the complexity of the issues relating to GPR. Permittivity of the ground determination error causes the resolution deterioration of the resulting image therefore an important task of the digital signal processing is the correct estimation of the permittivity. The article presents several methods devoted to this subject. As a simulation model of SAR system the pulse radar with LFM (Linear Frequency Modulation) signal has been applied. The aim of the experiment is to test ability of the SAR system to obtain fully focused image of the underground targets. The real data measurements took place on the 6th floor at the Faculty of Electronics and Information – Warsaw University of Technology. During measurement campaign the GPR SAR demonstrator mounted on the rails wagon has been used to generate radar motion.
    Źródło:
    International Journal of Electronics and Telecommunications; 2011, 57, 1; 49-54
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the temperature effect on the stresses and deformations of GRP panels during the grouting process when using relining technology
    Autorzy:
    Fyall, Zuzanna
    Powiązania:
    https://bibliotekanauki.pl/articles/2037697.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    relining technology
    GRP
    grouting process
    temperature
    Opis:
    The paper presents a numerical analysis of the behaviour of egg-shaped glass-reinforced plastic (GRP) panels during the grouting process when using short relining technology. The analysis was carried out for panels subjected to temperature changes. The temperature increase was caused by the heat of hydration of the grout. It was shown that temperature had a significant effect on the stresses occurring in the panels’ walls and also on their deformations. The analysis involved grout being added in a single stage and then in two stages for comparison. The distribution of stresses and deformations were examined for panels with different wall thicknesses that ranged from 12 to 20 mm. Extensive knowledge about the grouting process and the effect of temperature on the behaviour of GRP panels during the assembly stage when using short relining technology could make this non-disruptive technology more competitive with regards to the time of its implementation and its costs when compared to traditional methods.
    Źródło:
    Studia Geotechnica et Mechanica; 2021, 43, s1; 521-531
    0137-6365
    2083-831X
    Pojawia się w:
    Studia Geotechnica et Mechanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Upregulation of GRP78 and caspase-12 in diastolic failing heart
    Autorzy:
    Sun, Yingying
    Liu, Guanghui
    Song, Tao
    Liu, Fang
    Kang, Weiqiang
    Zhang, Yun
    Ge, Zhiming
    Powiązania:
    https://bibliotekanauki.pl/articles/1040708.pdf
    Data publikacji:
    2008
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    caspase-12
    diastolic heart failure
    GRP78; hypertension
    apoptosis
    Opis:
    Background: The endoplasmic reticulum (ER) fulfills multiple cellular functions. Various stimuli can potentially cause ER stress (ERS). ERS is one of the intrinsic apoptosis pathways and apoptosis plays a critical role in hypertension. Glucose regulated protein 78 (GRP78) has been widely used as a marker for ERS and caspase-12 mediated apoptosis was a specific apoptotic pathway of ER. The expression of GRP78 and caspase-12 remains poorly understood in the diastolic heart failure resulting from hypertension. Methods: We used spontaneously hypertensive rats (SHRs) to establish a model of diastolic heart failure, and performed immunohistochemistry, western blot, and real-time PCR to analyze GRP78 and caspase-12. Results: We found that GRP78 and caspase-12 had enhanced expression at protein and mRNA levels. Conclusions: These results suggest that GRP78 and caspase-12 were upregulated in cardiomyocytes and ERS can contribute to cardiac myocyte apoptosis in the diastolic heart failure resulting from hypertension.
    Źródło:
    Acta Biochimica Polonica; 2008, 55, 3; 511-516
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Oil pipeline leak detection using GPR method - simple case study
    Autorzy:
    Fąfara, Z.
    Lewandowska-Śmierzchalska, J.
    Matuła, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/299301.pdf
    Data publikacji:
    2018
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    pipelines
    leak detection
    GRP method
    computer simulation
    finite element modelling
    Opis:
    Modelling experiment was used to investigate the abilities of using ground penetrating radar (GPR) to detect oil leaks in the underground pipeline system. Leaks not only waste precious natural resources but also create substantial damage to the transportation system within urban environments. Surface geophysical methods are noninvasive tools used to characterize the changes in the physical properties of the subsurface material. This characterization, in consequence, is used to interpret the geological and hydrogeological conditions of the strata. GPR is a reflection-based technique which uses high frequency electromagnetic waves to acquire subsurface information. GPR responds to changes in electrical properties, which are a function of soil and rock material and moisture content. A simple experiment was conducted to determine the validity and effectiveness of GPR technology in detecting leakage in metal pipelines. Initially, a prototype model was designed to simulate a pipe leak. A 1.5 GHz antenna modeling mode was used to collect GPR data. The test was modelled using sandy soil material that is representative for pipelines construction. Also model simulations are being used to select an appropriate equipment configuration (frequency band, type of antenna and real-time imaging software) prior to data acquisition.
    Źródło:
    AGH Drilling, Oil, Gas; 2018, 35, 1; 165-171
    2299-4157
    2300-7052
    Pojawia się w:
    AGH Drilling, Oil, Gas
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Shooting resistance of non-metallic materials
    Autorzy:
    Kyzioł, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/260449.pdf
    Data publikacji:
    2007
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    glass reinforced plastics (GRP)
    wood-polymer composites
    ceramics
    rubber
    shooting
    shooting resistance
    ballistic plate
    Opis:
    This paper presents test results of shooting resistance of non-metallic materials such as ceramics, rubber, glass reinforced plastic (GRP), natural and modified wood. It was demonstrated that GRP samples 16 mm thick protected with ceramic plates 10 mm thick can be considered bullet-proof against bullets of 7.62 mm caliber. And, multi-layer plate with a core of natural or modified wood cannot be taken as a bullet-proof material against 7.62 mm bullets.
    Źródło:
    Polish Maritime Research; 2007, 4; 68-72
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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