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Wyszukujesz frazę "Kedra, M." wg kryterium: Wszystkie pola

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    Wyświetlanie 1-17 z 17
    Tytuł:
    Okiem ryby - nowe spojrzenie na rozwój sieci neuronalnych i choroby neurorozwojowe
    Autorzy:
    Kedra, M.
    Jaworski, J.
    Zmorzynska, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/848821.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Przyrodników im. Kopernika
    Tematy:
    neurony
    sieci neuronowe
    choroby neurorozwojowe
    badania modelowe
    organizmy modelowe
    danio pregowany
    Danio rerio
    oko
    siatkowka [anat.]
    Źródło:
    Wszechświat; 2016, 117, 10-12
    0043-9592
    Pojawia się w:
    Wszechświat
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Epibenthic diversity and productivity on a heavily trawled Barents Sea bank (Tromsoflaket)
    Autorzy:
    Kedra, M.
    Renaud, P.E.
    Andrade, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/49128.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    epibenthic diversity
    Barents Sea
    ecosystem
    benthic community
    secondary production
    epifaunal organism
    sponge
    trawled area
    Opis:
    Shallow Arctic banks have been observed to harbour rich communities of epifaunal organisms, but have not been well-studied with respect to composition or function due to sampling challenges. In order to determine how these banks function in the Barents Sea ecosystem, we used a combination of video and trawl/dredge sampling at several locations on a heavily trawled bank, Tromsøflaket — located at the southwestern entrance to the Barents Sea. We describe components of the benthic community, and calculate secondary production of dominant epifaunal organisms. Forty-six epibenthic taxa were identified, and sponges were a significant part of the surveyed benthic communities. There were differences in diversity and production among areas, mainly related to the intensity of trawling activities. Gamma was the most diverse and productive area, with highest species abundance and biomass. Trawled areas had considerably lower species numbers, and significant differences in epifaunal abundance and biomass were found between all trawled and untrawled areas. Trawling seems to have an impact on the sponge communities: mean individual poriferan biomass was higher in untrawled areas, and, although poriferans were observed in areas subjected to more intensive trawling, they were at least five times less frequent than in untrawled areas.
    Źródło:
    Oceanologia; 2017, 59, 2
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Urban vs. rural patients. Differences in stage and overall survival among patients treated surgically for lung cancer
    Autorzy:
    Rybojad, P.
    Dluski, D.
    Rybojad, B.
    Kedra, M.
    Sawicki, M.
    Skoczylas, P.
    Tabarkiewicz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/49882.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Medycyny Wsi
    Opis:
    Introduction. Besides the undoubted influence of risk factors on morbidity and survival time, there are also other environmental factors, such as awareness of the prevalence of risk factors and the availability of modern diagnosis and treatment methods. Objective. To evaluate differences in lung cancer 5-year overall survival rates between urban and rural patients hospitalized in the Department of Thoracic Surgery of the Medical University in Lublin, Poland, and possible influence of several risk factors on these rates. Materials and methods. The analysis was based on 125 lung cancer patients who underwent surgical procedures in years 2006-2007 and who agreed to take part in the survey. The study aimed at recognition of the health situation and selected demographic traits of people who had been treated surgically for lung cancer. The differences were evaluated between rural and urban inhabitants in gender, age, lung function, smoking habits, exposure to risk factors at work, family history of cancer, staging of the disease, histological type of cancer, post-surgical treatment, and their possible influence on overall survival. Results. The results showed that the only noted differences between urban and rural population were in tobacco smoking and lung function. Survival rates were very similar and did not differ from the European average. Conclusions. The assumption that Polish rural patients are presenting with later cancer stages at the time of diagnosis, and have worse chances for survival, has become invalid in modern times.
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2013, 20, 1
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The malacostracan fauna of two Arctic fjords (West Spitsbergen): the diversity and distribution patterns of its pelagic and benthic components
    Autorzy:
    Legezynska, J.
    Wlodarska-Kowalczuk, M.
    Gluchowska, M.
    Ormanczyk, M.
    Kedra, M.
    Weslawski, J.M.
    Powiązania:
    https://bibliotekanauki.pl/articles/48015.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    Malacostraca
    plankton
    glacial fjord
    Spitsbergen
    Kongsfjorden
    Hornsund Region
    Atlantic water
    diversity
    distribution
    Opis:
    This study examines the performance of pelagic and benthic Malacostraca in two glacial fjords of west Spitsbergen: Kongsfjorden, strongly influenced by warm Atlantic waters, and Hornsund which, because of the strong impact of the cold Sørkapp Current, has more of an Arctic character. The material was collected during 12 summer expeditions organized from 1997 to 2013. In all, 24 pelagic and 116 benthic taxa were recorded, most of them widely distributed Arctic-boreal species. The advection of different water masses from the shelf had a direct impact on the structure of the pelagic Malacostraca communities, resulting in the clear dominance of the sub-arctic hyperiid amphipod Themisto abyssorum in Kongsfjorden and the great abundance of Decapoda larvae in Hornsund. The taxonomic, functional and size compositions of the benthic malacostracan assemblages varied between the two fjords, and also between the glacier-proximate inner bays and the main fjord basins, as a result of the varying dominance patterns of the same assemblage of species. There was a significant drop in species richness in the strongly disturbed glacial bays of both fjords, but only in Hornsund was this accompanied by a significant decrease in density and diversity, probably due to greater isolation and poorer quality of sediment organic matter in its innermost basin. Our results suggest that the diversity and distribution of benthic malacostracans in these two fjords are only distantly related to the different hydrological regimes; rather, they are governed by locally acting factors, such as depth, sediment type, the variety of microhabitats and the availability and quality of food.
    Źródło:
    Oceanologia; 2017, 59, 4
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A huge biocatalytic filter in the centre of Barents Sea shelf?
    Autorzy:
    Weslawski, J.M.
    Kedra, M.
    Przytarska, J.
    Kotwicki, L.
    Ellingsen, I.
    Skardhamar, J.
    Renaud, P.
    Goszczko, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/48450.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    permeability sediment
    primary production
    Barents Sea
    organic carbon
    barnacle
    Balanus balanus
    mollusc
    Mya truncata
    Hiatella arctica
    Opis:
    A primary production model for the Barents Sea shows a hot spot of organic carbon settlement to the sea bed over 100 km long, a shallow pile of highly permeable sediments (mainly large Balanus, Mya and Pecten shell fragments over 1 cm in size) of glacial origin. Hydrodynamic flow models suggest an intensive, deep flow of near-bottom waters into the sediment. Depending on wave height, water in shallow (30 m depth) places may percolate more than 5 m into the sediment. During 10 days of stormy weather as much as 4 to 8 kg wet weight pelagic biomass can be processed per square metre through this extremely permeable sediment. Analogous processes known in coastal waters lead to intense biocatalytic phenomena and metabolism of organic carbon within the seabed, estimated here as more intense than surface consumption. Spitsbergenbanken may be acting as a huge sink for organic carbon and an important source of nutrients in one of the most productive areas of the North Atlantic.
    Źródło:
    Oceanologia; 2012, 54, 2
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spigelian hernia: a case report
    Autorzy:
    Martyniuk, M.
    Ustymowicz, W.
    Zińczuk, J.
    Pryczynicz, A.
    Guzińska-Ustymowicz, K.
    Kędra, B.
    Zaręba, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1918888.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Medyczny w Białymstoku
    Tematy:
    Hernia
    Spigelian hernia
    incarcerated
    Opis:
    Spigelian hernias constitute a minute fraction of all abdominal hernias. In this monography, we present a case report of this relatively seldom seen phenomenon which some general surgeons never get to see during their medical career.
    Źródło:
    Progress in Health Sciences; 2019, 2; 53-56
    2083-1617
    Pojawia się w:
    Progress in Health Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling of Mechanical Behaviour of High-Frequency Piezoelectric Actuators Using Bouc-Wen Model
    Autorzy:
    Kędra, R.
    Rucka, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/221301.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    piezoelectric actuators
    Bouc-Wen model
    parameters identification
    Opis:
    The paper presents application of a modified, symmetrical Bouc-Wen model to simulate the mechanical behaviour of high-frequency piezoelectric actuators (PAs). In order to identify parameters of the model, a two-step algorithm was developed. In its first stage, the mechanical parameters were identified by taking into account their bilinear variability and using a square input voltage waveform. In the second step, the hysteresis parameters were determined based on a periodic excitation. Additionally, in order to reduce the influence of measurement errors in determination of selected derivatives the continuum wavelet transform (CWT) and translation-rotation transformation (TRT) methods were applied. The results proved that the modified symmetrical Bouc-Wen model is able to describe the mechanical behaviour of PAs across a wide frequency range.
    Źródło:
    Metrology and Measurement Systems; 2017, 24, 2; 413-424
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cancer of the gallbladder – own experience
    Autorzy:
    Gryko, M.
    Dawidziuk, T.
    Sawicka, E.
    Cepowicz, D.
    Kamocki, Zb.
    Masiulaniec, P.
    Kędra, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1916507.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Medyczny w Białymstoku
    Tematy:
    gallbladder cancer
    survival
    surgery
    gallstones
    cholecystectomy
    Opis:
    Gallbladder cancer is a relatively rare cancer of the gastrointestinal tract, most commonly detected (approximately 95% of cases) in the most advanced clinical stage IV and burdened with high mortality rate. This is mainly due to the nonspecific symptoms in the early stages of the disease. The remaining cases of gallbladder cancer are usually detected after surgery due to gallstone disease. Gallstones, their size and pancreatic juice reflux into the gallbladder are risk factors in the development of gallbladder cancer. In this paper the authors carried out a retrospective research based on an evaluation of a group of 38 patients treated surgically due to the gallbladder cancer in the years 2005-2012 in the Second Department of General and Gastroenterological Surgery in Białystok Medical University Hospital. In this group there were 29 women and 9 men, in age between 48-86 years. Although women suffered from gallbladder cancer more often than men, their survival rate was significantly better after the surgery. The research showed some benefits of extended surgical procedures even in patients with advanced stages of the disease, while the effectiveness of surgical treatment depends mainly on the possibility of radical resection of the primary lesion and, eventually, the resection of lymph nodes and other infiltrated tissues.
    Źródło:
    Progress in Health Sciences; 2014, 4, 1; 153-157
    2083-1617
    Pojawia się w:
    Progress in Health Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preload monitoring in a bolted joint using Lamb wave energy
    Autorzy:
    Kędra, R.
    Rucka, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/201172.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Lamb waves
    steel structures
    bolted joints
    non-destructive testing
    structural health monitoring
    Opis:
    The knowledge of the load in prestressed bolted connections is essential for the proper operation and safety of engineering structures. Recently, bolted joints have become an area of intensive research associated with non-destructive diagnostics, in particular in the context of wave propagation techniques. In this paper, a novel procedure of bolt load estimation based on the energy of Lamb wave signals was proposed. Experimental tests were performed on a single lap joint of two steel plates. Ultrasonic waves were excited and registered by means of piezo-electric transducers, while precise measurement of the bolt load was obtained by means of using the force washer transducer. Experimental tests were supported by the finite element method analysis based on Schoenberg’s concept. The results showed that the relationship between the bolt load and signal energy was strongly nonlinear and it depended on the location of acquisition points.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2019, 67, 6; 1161-1169
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preliminary studies of fungi in the Biebrza National Park (NE Poland). II. Macromycetes
    Wstępne badania grzybów w Biebrzańskim Parku Narodowym. II. Grzyby wielkoowocnikowe
    Autorzy:
    Kujawa, A.
    Wrzosek, M.
    Domian, G.
    Kedra, K.
    Szkodzik, J.
    Rudawska, M.
    Leski, T.
    Karlinski, L.
    Pietras, M.
    Gierczyk, B.
    Dynowska, M.
    Slusarczyk, D.
    Kalucka, I.
    Lawrynowicz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/67101.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Opis:
    This paper presents the second part of the results of the first short-term inventory of fungi species occurring in the Biebrza National Park and is focused on a survey of macrofungi. The total number of macrofungi found during the survey in late August 2012 was 289 taxa: 17 ascomycetes and 272 basidiomycetes, inhabiting diverse ecological niches. The identified fungi belonged to ectomycorrhizal symbionts and saprobionts decomposing wood, plant litter and animal remnants. The identity of 25 mycorrhizal fungi species has been confirmed using molecular techniques. Five species are newly reported for Poland (Amanita olivaceogrisea, Lepiota lepida, Stropharia alcis, Xerocomus fennicus, X. cisalpinus) and 225 taxa (79 %) were not known in the Biebrza National Park. Fifty nine species are endangered in Poland, of which nine species are protected by law. Data on species richness and the taxonomic diversity of the identified fungi are briefly commented in terms of their significance for nature conservation and future research.
    Prezentowane dane są wynikiem badań prowadzonych w dniach od 28 sierpnia do 1 września 2012 w ramach sesji terenowej Polskiego Towarzystwa Mykologicznego. Celem była wstępna inwentaryzacja grzybów wielkoowocnikowych występujących na terenie Biebrzańskiego Parku Narodowego (BbPN), terenu niemal zupełnie nie poznanego pod względem mykobioty. W artykule zamieszczono wykaz zidentyfikowanych 289 taksonów (gatunków, odmian i form) grzybów workowych i podstawkowych. Wśród znalezionych gatunków są grzyby bardzo rzadkie, znane z zaledwie jednego lub kilku stanowisk w Polsce (16 gatunków), a także wykazane w literaturze z Polski po raz pierwszy (5) oraz zagrożone i objęte ochroną (59), w tym Phellodon confluens – uznawany za wymarły. Jak wskazano w części pierwszej artykułu (Ruszkiewicz-Michalska et al. 2012), badania przeprowadzone w BbPN są pierwszymi z planowanego przez Polskie Towarzystwo Mykologiczne cyklu inwentaryzacji w obiektach objętych różnymi formami ochrony. W wielu takich obiektach (parkach narodowych, rezerwatach, parkach krajobrazowych oraz obszarach Natura 2000) brak jest danych mykologicznych lub są fragmentaryczne albo wymagające aktualizacji. Podstawową przesłanką do prowadzenia badań inwentaryzacyjnych jest potrzeba uwzględniania grzybów w polityce ochrony przyrody, zarówno na obszarze parków narodowych, jak i w szerszej skali.
    Źródło:
    Acta Mycologica; 2012, 47, 2
    0001-625X
    2353-074X
    Pojawia się w:
    Acta Mycologica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hiatus hernia – Late complication after gastrectomy followed by double tract reconstruction (DTR): a case report
    Autorzy:
    Bandurski, R.
    Gryko, M.
    Dawidziuk, T.
    Zaręba, K.
    Cepowicz, D.
    Kędra, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1916509.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Medyczny w Białymstoku
    Tematy:
    gastric cancer
    hiatus hernia
    late complication
    surgery
    Opis:
    In patients with dyspeptic symptoms who have been treated for gastric cancer, other medical conditions apart from cancer recurrence should be considered. A long small-bowel loop left after esophagogastric anastomosis, flaccid diaphragmatic crura, and several external factors such as hard physical exertion can promote the development of postoperative hiatus hernia. The authors of this paper present a rare case of hiatus hernia considered a late complication of primary surgery performed due to gastric cancer. The 63-year-old patient had undergone total gastrectomy with double tract reconstruction (DTR) six years earlier. Gastrectomy was performed with extended lymphadenectomy (>D2). Histopathologic examination of tumor specimens showed mucinous adenocarcinoma with no lymph node metastasis and no distant metastases (pathologic staging: pT2, pN0, pM0). After six years, the patient was admitted to the 2nd Department of General and Gastroenterologic Surgery with abdominal pains, malaise, weight loss and feeling of fullness after small meals. Diagnostic procedures performed showed the presence of hiatus hernia, a very rare complication after this particular surgery, with no features of cancer recurrence. The patient was underwent surgery and the hernia was successfully repaired.
    Źródło:
    Progress in Health Sciences; 2014, 4, 1; 265-268
    2083-1617
    Pojawia się w:
    Progress in Health Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Aplication of guided wave propagation in diagnostics of steel bridge components
    Autorzy:
    Rucka, M.
    Zima, B.
    Kędra, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/230884.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    badanie nieniszczące
    wykrywanie uszkodzenia
    ocena stanu
    propagacja fali
    fala kierowana
    most stalowy
    non-destructive testing
    damage detection
    condition assessment
    wave propagation
    guided wave
    steel bridge
    Opis:
    Early detection of potential defects and identification of their location are necessary to ensure safe, reliable and long-term use of engineering structures. Non-destructive diagnostic tests based on guided wave propagation are becoming more popular because of the possibility to inspect large areas during a single measurement with a small number of sensors. The aim of this study is the application of guided wave propagation in non-destructive diagnostics of steel bridges. The paper contains results of numerical analyses for a typical railway bridge. The ability of damage detection using guided Lamb waves was demonstrated on the example of a part of a plate girder as well as a bolted connection. In addition, laboratory tests were performed to investigate the practical application of wave propagation for a steel plate and a prestressed bolted joint.
    Źródło:
    Archives of Civil Engineering; 2014, 60, 4; 493-515
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Diagnostics of bolted lap joint using guided wave propagation
    Diagnostyka zakładkowego połączenia śrubowego z użyciem propagacji fal prowadzonych
    Autorzy:
    Kędra, R.
    Rucka, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/329436.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
    Tematy:
    elastic waves
    non-destructive testing
    bolted lap joint
    finite element method
    fala sprężysta
    diagnostyka nieniszcząca
    połączenie śrubowe
    metoda elementów skończonych
    Opis:
    The paper presents numerical and experimental analyses of elastic waves propagation in a bolted lap joint. In experimental investigations condition assessment of the joint was performed with the use of symmetric waves excited by a piezoactuator. Numerical calculations were conducted in commercial finite element method software Abaqus. The influence of number of bolts and the value of the initial stress on recorded signals was examined. The study showed the possibility of using elastic waves in the context of diagnostics of bolted joints.
    Praca przedstawia numeryczne i eksperymentalne analizy propagacji fal sprężystych w zakładkowym połączeniu śrubowym. W badaniach eksperymentalnych wykorzystano fale wzbudzane w płaszczyźnie połączenia za pomocą piezoaktuatora. Obliczenia numeryczne wykonano w środowisku komercyjnego programu metody elementów skończonych Abaqus. W badaniach analizowano wpływ liczby śrub i wartości momentu dokręcającego na zarejestrowane sygnały. Wykazano możliwość zastosowania fal sprężystych do diagnostyki połączeń.
    Źródło:
    Diagnostyka; 2014, 15, 4; 35-40
    1641-6414
    2449-5220
    Pojawia się w:
    Diagnostyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of expression of selected proteins in the cells of intestinal and diffuse type gastric cancer – immunohistochemical analysis
    Autorzy:
    Gryko, M.
    Prycznicz, A.
    Dawidziuk, T.
    Zińczuk, J.
    Cepowicz, D.
    Kamocki, Zb.
    Kedra, B.
    Guzińska-Ustymowicz, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1916399.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Medyczny w Białymstoku
    Tematy:
    gastric cancer
    apoptosis
    Lauren classification
    E-cadherin
    apoptotic pathways
    Opis:
    Introduction: Despite the progress in gaining knowledge about carcinogenesis, it is still unclear what processes are directly responsible for the differentiation of gastric cancer into its intestinal or diffuse form. Dividing of these two forms is based on one of the oldest, yet still commonly used classifications – the classification of Lauren. There are many factors that may influence the formation of gastric tumors of various aggressiveness. Purpose: To evaluate the expression of proteins: fragile histidine triad (FHIT), E-cadherin, α-catenin, γ-catenin, cathepsin B, epidermal growth factor (EGF), HER-2, MMP-9, MCM-2, Bak, Bax, BID, Bcl-XL, p53, FasL, Bcl-2, caspase-8, procaspase-3 in gastric cancer cells, depending on the type of tumor by Lauren classification. Materials and methods: Study group consisted of 91 patients treated surgically for gastric cancer in the Second Department of General and Gastroenterological Surgery, Medical University of Bialystok in years between 2000 and 2006. Results: It is shown, that the expression of E-cadherin was significantly higher in the Lauren I gastric cancer cells than in Lauren II. In case of caspase-8 there has been significantly less frequent expression of this protein in Lauren I gastric cancer cells compared to Lauren II. The authors describe no statistically significant differences in the expression of other proteins taken into consideration. Conclusions: These results suggest the role of adhesion and apoptosis-related proteins in the development of two different types of gastric cancer according to Lauren’s classification.
    Źródło:
    Progress in Health Sciences; 2014, 4, 1; 158-164
    2083-1617
    Pojawia się w:
    Progress in Health Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ba0.5Sr0.5Co0.8Fe0.2O3-σ and La0.6Sr0.4Co0.8Fe0.2O3-σ composite cathode for solid oxide fuel cell
    Autorzy:
    Mosiałek, M.
    Kędra, A.
    Krzan, M.
    Bielańska, E.
    Tatko, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/355878.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    barium strontium cobalt ferrite
    lanthanum strontium cobalt ferrite
    solid oxide fuel cell
    oxygen reduction reaction
    electrochemical impedance spectroscopy
    Opis:
    Composite cathodes contain Ba0.5Sr0.5Co0.8Fe0.2O3-σ and La0.6Sr0.4Co0.8Fe0.2O3-σ were tested in different configuration for achieving cathode of area specific resistance lower than Ba0.5Sr0.5Co0.8Fe0.2O3-σ and La0.6Sr0.4Co0.8Fe0.2O3-σ cathodes. Electrodes were screen printed on samaria-doped ceria electrolyte half-discs and tested in the three electrode setup by the electrochemical impedance spectroscopy. Microstructure was observed by scanning electron microscopy. The lowest area specific resistance 0.46 and 2.77 Ω cm-2 at 700 °C and 600 °C respectively revealed composite cathode contain Ba0.5Sr0.5Co0.8Fe0.2O3-σ and La0.6Sr0.4Co0.8Fe0.2O3-σ in 1:1 weight ratio. The area specific resistance of this cathode is characterized by the lowest activation energy among tested cathodes.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 3; 1483-1488
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Studying of Perovskite Nanoparticles in PMMA Matrix Used as Light Converter for Silicon Solar Cell
    Autorzy:
    Lipiński, M.
    Socha, R. P.
    Kędra, A.
    Gawlińska, K.
    Kulesza-Matlak, G.
    Major, Ł.
    Drabczyk, K.
    Łaba, K.
    Starowicz, Z.
    Gwóźdź, K.
    Góral, A.
    Popko, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/356850.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    perovskite nanoparticles
    light converters
    solar cells
    solar energy materials
    Opis:
    The nanoparticles of CH3NH3PbBr3 hybrid perovskites were synthesized. These perovskite nanoparticles we embedded in polymethyl methacrylate (PMMA) in order to obtain the composite, which we used as light converter for silicon solar cells. It was shown that the composite emit the light with the intensity maximum at about 527 nm when exited by a short wavelength (300÷450 nm) of light. The silicon solar cells were used to examine the effect of down-conversion (DC) process by perovskite nanoparticles embedded in PMMA. For experiments, two groups of monocrystalline silicon solar cells were used. The first one included the solar cells without surface texturization and antireflection coating. The second one included the commercial cells with surface texturization and antireflection coating. In every series of the cells one part of the cells were covered by composite (CH3NH3PbBr3 in PMMA) layer and second part of cells by pure PMMA for comparison. It was shown that External Quantum Efficiency EQE of the photovoltaic cells covered by composite (CH3NH3PbBr3 in PMMA) layer was improved in both group of the cells but unfortunately the Internal Quantum Efficiency was reduced. This reduction was caused by high absorption of the short wavelength light and reabsorption of the luminescence light. Therefore, the CH3NH3PbBr3 perovskite nanoparticles embedded in PMMA matrix were unable to increase silicon solar cell efficiency in the tested systems.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 3; 1733-1739
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numeryczna i doświadczalna analiza propagacji fal sprężystych przez stalowe połączenie śrubowe
    A study on propagation of elastic waves in steel bolted joints
    Autorzy:
    Rucka, M.
    Kędra, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/391218.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
    Tematy:
    propagacja fal sprężystych
    węzły konstrukcji stalowych
    połączenia śrubowe
    modelowanie MES
    badania doświadczalne
    wave propagation
    nodes of steel structures
    bolted joints
    FEM calculations
    experimental investigations
    Opis:
    W pracy przedstawiono numeryczną i doświadczalną analizę propagacji fal sprężystych w połączeniu śrubowym dwóch blach stalowych. Obliczenia numeryczne metodą elementów skończonych przeprowadzono dwuetapowo. W pierwszej fazie analizowano statyczny wpływ sił sprężających na stan odkształceń i naprężeń połączenia śrubowego, formułując warunki kontaktu zastosowane następnie w modelu dynamicznym. W analizie propagacji fal sprawdzono wpływ naprężeń wstępnych na rezultaty obliczeń. Porównawcze badania doświadczalne wykonano przy wykorzystaniu wzbudnika piezoelektrycznego oraz wibrometru laserowego.
    The paper presents experimental and numerical analysis of elastic waves propagation in bolted connection of two steel plates. Numerical calculations were carried out using finite element method in two stages. In the first stage, static behavior of the joint during bolts compression was analyzed. Results of static analysis were used to formulate contact conditions for dynamic models. The analysis of wave propagation was taken for four types of bolt connection model. Finally, experimental tests by using a laser vibrometer and piezoelectric actuator were made in order to validate finite element models.
    Źródło:
    Budownictwo i Architektura; 2014, 13, 2; 299-306
    1899-0665
    Pojawia się w:
    Budownictwo i Architektura
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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