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    Wyświetlanie 1-4 z 4
    Tytuł:
    Zmiany parametrów optycznych i elektrycznych diod laserowych na pasmo 808 nm i 880 nm w czasie długotrwałej pracy
    Changing optical and electrical parameters of laser diodes (LDs) emitting at 808 nm and 880 nm during continuous operation
    Autorzy:
    Dąbrowska, E.
    Teodorczyk, M.
    Krzyżak, K.
    Romaniec, M.
    Sobczak, G.
    Maląg, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/192166.pdf
    Data publikacji:
    2014
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Technologii Materiałów Elektronicznych
    Tematy:
    dioda laserowa
    test starzeniowy
    degradacja diod
    elektroluminescencja
    laser diode
    degradation of laser diode
    life test
    electroluminescence
    Opis:
    Zaprezentowane zostały zmiany parametrów optycznych i elektrycznych diod podczas długotrwałej pracy: zmniejszenie mocy wyjściowej, zwiększenie prądu progowego jak i zmiana długości fali emisji - dla diod na pasmo 880 nm w kierunku fal krótszych oraz dla diod na pasmo 808 nm w kierunku fal dłuższych.
    The following changes in optical and electrical parameters for diodes during long-term operation are presented: reduction in the output power, increase in the threshold current and change in the emission wavelength for diodes emitting at 880 nm towards shorter wavelengths and for diodes emitting at 808 nm towards longer wavelengths.
    Źródło:
    Materiały Elektroniczne; 2014, T. 42, nr 3, 3; 5-10
    0209-0058
    Pojawia się w:
    Materiały Elektroniczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ropa naftowa i gaz ziemny w Polsce : obszary perspektywiczne oraz postępowanie przetargowe w 2018 r. (część I)
    Oil and gas in Poland : prospects and licensing rounds in 2018 in terms of hydrocarbon concessions (part I)
    Autorzy:
    Jagielski, G.
    Feldman-Olszewska, A.
    Janas, M.
    Kiersnowski, H.
    Krzyżak, E.
    Podhalańska, T.
    Roszkowska-Remin, J.
    Sobień, K.
    Wójcik, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2075843.pdf
    Data publikacji:
    2018
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    koncesje na poszukiwanie
    rozpoznawanie węglowodorów
    eksploatacja węglowodorów
    Ministerstwo Środowiska
    concessions for prospection
    exploration of hydrocarbons
    exploitation of hydrocarbons
    Polish Ministry of the Environment
    Opis:
    On the 28th of June 2017, the Polish Ministry of the Environment announced the boundaries of the tender areas selected for the third licensing round for concessions for prospection, exploration and exploitation of hydrocarbons. This round is going to be proceeded in the 4th Quarter of 2018 and 1st Quarter of 2019. The geologists of the Polish Geological Survey selected 15 tender areas (promising for discoveries of conventional and unconventional oil and gas fields) based on the geological data resources stored in the National Geological Archive, other published data, as well as the knowledge and experience of employees of the Polish Geological Institute - National Research Institute and the Polish Ministry of the Environment. All selected areas are located onshore. In this article we describe 10 tender areas located in the Gdańsk, Pomerania and Wielkopolska petroleum provinces. Other tender areas situated in the Carpathians (Błażowa, Proszowice W, Rudnik-Lipiny, Wetlina) and in the Lublin Petroleum Province (Ryki) will be discussed in the next publication. Three areas: Wejherowo, Bytów and Braniewo-Miłakowo are located in the northern Poland (Gdańsk Petroleum Province). The exploration targets of these areas are generally related to structural-lithological traps in the Middle Cambrian beds of the Baltic Basin, as well as to unconventional shale oil and gas in the Lower Paleozoic. Seven tender areas are situated in the northwestern Poland (Pomerania and Wielkopolska Petroleum Provinces). Three of them - Chodzież, Piła and Leszno are dedicated to conventional gas deposits in the Rotliegend sandstones and, in some cases, also oil deposits in the Zechstein/Main Dolomite. Excluding the Leszno tender area, chances for tight gas discoveries exist within the Rotliegend sandstones. The exploration target of the Konin tender area is related to possible conventional fields in the Jurassic and Lower Cretaceous beds. In the Pomerania region the exploration target is generally related to conventional hydrocarbon deposits in the Devonian, Carboniferous and Permian (Rotliegend and Zechstein/Main Dolomite). Three tender areas are situated within the region of: Sierpowo, Orle and Chełmno. As a rule, a concession is granted for a period of 10 to 30 years and is divided into 2 phases: 1) prospecting and exploration phase (which lasts from 4 to 5 years and can be extended to another 2-year period), 2) production phase. Every entity interested in obtaining a concession needs to undergo the qualification procedure. We believe that this publication will contribute to better understanding of the offered tender areas and encourage activity in the Polish oil and gas sector.
    Źródło:
    Przegląd Geologiczny; 2018, 66, 12; 724--740
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of the properties of polymer composites with carbon nanotubes in the aspect of their abrasive wear
    Autorzy:
    Krzyżak, A.
    Kosicka, E.
    Szczepaniak, R.
    Szymczak, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/367013.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    polymer composites
    tribology
    reinforcement
    carbon nanotubes
    CNTs
    wear
    kompozyty polimerowe
    trybologia
    wzmocnienie
    nanorurki węglowe
    zużycie
    Opis:
    Purpose: Carbon nanotubes are used in composite materials due to the improvement of (including tribological) properties of composites, especially thermoplastic matrix composites. This demonstrates the potential of CNTs and the validity of research on determining the impact of this type of reinforcement on the composite materials under development. Design/methodology/approach: The article presents selected results of research on polymer composites made of C.E.S. R70 resin, C.E.S. H72 hardener with the addition of a physical friction modifier (CNTs) with a percentage by volume of 18.16% and 24.42%, respectively, which also acts as a reinforcement. The produced material was subjected to hardness measurements according to the Shore method and EDS analysis. The study of abrasive wear in reciprocating movement was carried out using the Taber Linear Abraser model 5750 tribotester and a precision weight. The surface topography of the composite material after tribological tests was determined using scanning electron microscopy (SEM). Some of the mentioned tests were carried out on samples made only of resin, used as the matrix of the tested polymer composite. Findings: Carbon nanotubes used in polymer matrix composites, including bisphenol A/F epoxy resin have an influence on the tribological properties of the material. The addition of carbon nanotubes contributed to a 24% increase in the Ra parameter relative to pure resin, to a level corresponding to rough grinding of steel. Research limitations/implications: The results of the tests indicate the need to continue research in order to optimize the composition of composites in terms of operating parameters of friction nodes in broadly understood aviation. Originality/value: The analysed literature did not find any studies on the impact of the addition of carbon nanotubes on epoxy resins based on bisphenol A/F. Due to the wide scope of application of such resins, the properties of such composite materials in which carbon nanotubes are the reinforcing phase have been investigated.
    Źródło:
    Journal of Achievements in Materials and Manufacturing Engineering; 2019, 95, 1; 5-12
    1734-8412
    Pojawia się w:
    Journal of Achievements in Materials and Manufacturing Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Inequalities in breast cancer incidence and stage distribution between urban and rural female population in Swietokrzyskie Province, Poland
    Autorzy:
    Paszko, A.
    Krzyżak, M.J.
    Charkiewicz, A.E.
    Ziembicka, D.
    Żendzian-Piotrowska, M.
    Szpak, A.S.
    Florek-Łuszczki, M.
    Maślach, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/2082946.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Medycyny Wsi
    Tematy:
    breast cancer
    incidence
    inequalities in health
    urban and rural population
    stage distribution
    Opis:
    Introduction and objective. One of the main factors determining the burden of breast cancer is the effectiveness of measures taken to combat this cancer including urban-rural differences. The aim of the study was to analyse the differences in breast cancer incidence and disease stage distribution among urban and rural women in the Świętokrzyskie Province as a part of a strategy for breast cancer control. Materials and method. The study of disease stage distribution included 483 female residents of Świętokrzyskie Province who were diagnosed in 2013 with invasive breast cancer, and reported to Świętokrzyskie Office for Cancer Registration. Urban-rural differences in breast cancer incidence in 2002–2013 were presented using Range Ratio (RR). Changes in incidence trends in urban and rural areas were analysed using joinpoint models. Annual Percentage Change (APC) of the rates was calculated for each time trend. Results. Breast cancer incidence rate in the urban female population was higher than in rural women with RR, amounting to 1.43. However, the analysis of trends showed that the pace and direction of change were developing negatively among inhabitants of rural areas. In 2002–2013, in rural women, the age-standardized rate (ASR) values increased by 2.8% per year (p<0.05). The course of ASR trends showed statistically significant urban-rural differences (p=0.004). Analysis of urban-rural differences in disease stage distribution revealed a non-significantly higher proportion of cases with localised stage in urban than in rural areas, amounting to 51.0% and 43.9%, respectively. Conclusions. Existing health inequalities indicate the need to intensify activities in rural areas and should be the starting point for making key decisions in combating breast cancer.
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2019, 26, 1; 169-164
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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