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    Wyświetlanie 1-15 z 15
    Tytuł:
    EPR study of guanidine zinc sulphate crystals
    Autorzy:
    Gruszka, K.
    Hrabański, R.
    Ozga, J.
    Czapla, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/146384.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    electron paramagnetic resonance (EPR)
    zero-field splitting (ZFS)
    transition ions in crystals
    Opis:
    X-band electron paramagnetic resonance (EPR) investigations of Mn2+-doped guanidine zinc sulphate [C(NH2)3]2Zn(SO4)2 – abbreviated as GZS – are presented. The EPR spectrum in the temperature range 273–393 K exhibits a group of five fine structure transitions each splits into six hyperfine components. The angular variation of EPR spectra reveals the presence of only one magnetic complex, which correspond to one distinct site of Mn2+ ions in the crystal lattice. From the observed EPR spectrum, the spin-Hamiltonian parameters have been evaluated. The variation of zero-field splitting (ZFS) parameter, intensity and line width with temperature are measured and discussed.
    Źródło:
    Nukleonika; 2013, 58, 3; 387-390
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wyładowania atmosferyczne w środowisku leśnym na przykładzie obserwacji w Nadleśnictwie Brzeg
    The lightnings in the forest ecosystem on the example of observations at Brzeg Forest District
    Autorzy:
    Chojnacka-Ozga, L.
    Gomolka, J.
    Ozga, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/887278.pdf
    Data publikacji:
    2014
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
    Tematy:
    Nadlesnictwo Brzeg
    srodowisko lesne
    wyladowania atmosferyczne
    gleby
    ekosystemy lesne
    Źródło:
    Scientific Review Engineering and Environmental Sciences; 2014, 23, 3[65]
    1732-9353
    Pojawia się w:
    Scientific Review Engineering and Environmental Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Leśny operator turystyki - nowe możliwości promowania turystyki w lesie
    Forest tour operator – new possibilities of promoting foresttourism
    Autorzy:
    Sklodowski, J.
    Ozga, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/882086.pdf
    Data publikacji:
    2013
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Leśny Zakład Doświadczalny. Centrum Edukacji Przyrodniczo-Leśnej w Rogowie
    Tematy:
    lasy
    nadlesnictwa
    turystyka lesna
    operatorzy turystyki lesne
    lesne produkty turystyczne
    Źródło:
    Studia i Materiały Centrum Edukacji Przyrodniczo-Leśnej; 2013, 15, 4[37]
    1509-1414
    Pojawia się w:
    Studia i Materiały Centrum Edukacji Przyrodniczo-Leśnej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zmienność sygnału klimatycznego w przyrostach radialnych na różnych wysokościach pnia jesionu wyniosłego (Fraxinus excelsior L.) rosnącego w dolinie Pilicy
    Variability of radial growth reaction and climatic signal on different heights of stem of European ash (Fraxinus excelsior L.) growing in Pilica Valley
    Autorzy:
    Chojnacka-Ozga, L.
    Jerczynski, T.
    Ozga, W.
    Zakrzewski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/881604.pdf
    Data publikacji:
    2016
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Leśny Zakład Doświadczalny. Centrum Edukacji Przyrodniczo-Leśnej w Rogowie
    Tematy:
    dendroklimatologia
    drzewa
    jesion wyniosly
    Fraxinus excelsior
    przyrosty radialne
    wzor przyrostowy
    zmiennosc wzdluz pnia
    Nadlesnictwo Gidle
    Dolina Pilicy
    Źródło:
    Studia i Materiały Centrum Edukacji Przyrodniczo-Leśnej; 2016, 18, 3[48]
    1509-1414
    Pojawia się w:
    Studia i Materiały Centrum Edukacji Przyrodniczo-Leśnej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preferencje osób odwiedzjących wybrane kompleksy leśne w zakresie turystyki leśnej i organizacji wypoczynku
    The preferences of visitors to selected forest areas for tourism and recreational purposes
    Autorzy:
    Skłodowski, J.
    Gołos, P.
    Skłodowski, M.
    Ożga, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1290584.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    lasy
    funkcje lasu
    funkcje rekreacyjne
    turystyka lesna
    wypoczynek
    zagospodarowanie turystyczne
    opinia spoleczna
    preferencje uzytkownikow
    preferencje turystyczno-rekreacyjne
    Opis:
    Questionnaire surveys were conducted from July 1st to August 15th, 2012 in forests near Gołdap, Białowieża, Pisz, Kraoenik, Warsaw and Zakopane with 335 respondents – 146 residents (43.6%) and 189 tourists (56.4%). The respondents declared that they visit forests throughout the year for various purposes, most often with family or friends and most frequently for the recreational activity of walking. They typically spend about three hours in the forest during a single visit. Respondents perceived the most important functions of the forest as a place where plants and animals live, as well as a place for recreation. In their view, the state budget should be a source of co-financing the recreational management of the forest. Only a small number of respondents (27.5%) would be willing to allocate a portion of their income for recreational forest management. According to the respondents, the most important elements needed in the forest to improve its quality for tourism are information signs and litter bins. Respondents perceive the greatest threats to the forest from tourism to be vandalism, automobiles driving into the forest and wildlife disturbance, whereas the greatest threats to tourists were reported to be biting and stinging animals (snakes, ticks and mosquitoes) and the possibility of getting lost. Respondents indicated clean air, peace and quiet, as well as the ability to harvest wild fruits, plants and mushrooms as the greatest advantages of using the forest for recreation. A large proportion of respondents admitted that they would like to use the services of professional foresters, especially for nature walks and health related purposes, as well as to educate children and youth about nature and the forest.
    Źródło:
    Leśne Prace Badawcze; 2013, 74, 4
    1732-9442
    2082-8926
    Pojawia się w:
    Leśne Prace Badawcze
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Formation of the attitudes and behaviours of employees in the context of safe operation of buildings on the example of the University of Agribusiness in Lomza
    Autorzy:
    Obolewicz, J.
    Baryłka, A.
    Szota, M.
    Oźga, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2201077.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    developing nations
    promoting
    global industrial
    economic infrastructure
    international research
    teaching
    kraje rozwijające się
    promowanie
    globalny przemysł
    infrastruktura gospodarcza
    międzynarodowe projekty badawcze
    nauczanie
    Opis:
    Purpose The issue of shaping the attitude of employee involvement in an organisation is a relatively new area of scientific interest. Shaping employees' attitudes, understood as a conscious influence to consolidate or change them so that they are conducive to the safe operation of building objects, should be of significant importance for any organisation. Attitude is related to behaviour, the most elementary form of human activity, which is externally observable. Design/methodology/approach Statistical analysis. Findings The issue of shaping organisational attitudes and behaviours is related to the need to consider the factors that trigger the change process. It is important to diagnose whether the engine of change is the person with a specific attitude or elements from his environment. Research limitations/implications The article presents a theoretical introduction and the results of diagnostic tests. It proposes actions shaping the attitudes and behaviour of employees regarding the safe operation of buildings, based on the example of the University of Agribusiness in Lomza. Practical implications The classical approach to the safety of buildings focuses primarily on the technical and engineering side of the building. Planners, designers, contractors, and users of buildings strive to make them the least hazardous to health and life, especially during the operation of the building. At the same time, it is important to bear in mind that safe operation is influenced by the behaviour of facility users, as they are the weakest link in management. Consequently, this is where the reserves for raising the health and safety of building users to a higher level still lie. Originality/value One of the main factors significantly influencing how an individual will behave when placed in a risky situation is how they perceive the risks involved. People's beliefs about various things can influence their behaviour more strongly than objective reality. To activate the reserves hidden in human behaviour to improve the safety level of buildings, it is necessary to fully recognise the causes and mechanisms that lead users to risky actions. Those behaviours allow the application of appropriate training and supervision methods, and more broadly of management methods, which would induce users to behave safely and to react consciously, directly or indirectly, to emerging risks during the operation of the works.
    Źródło:
    Journal of Achievements in Materials and Manufacturing Engineering; 2022, 115, 2; 64--74
    1734-8412
    Pojawia się w:
    Journal of Achievements in Materials and Manufacturing Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Selected risk factors for ischemic heart disease and the success of treatment in patients with STEMI myocardial infarction treated with percutaneous coronary intervention
    Autorzy:
    Jędrzejczyk-Cwanek, M.
    Gurowiec, P.J.
    Ozga, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/2087710.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Opolski. Instytut Nauk o Zdrowiu
    Tematy:
    myocardial infarction
    risk factors
    ischemic heart disease
    Opis:
    Background: Coronary heart disease is one of the most common causes of hospitalization and premature deaths in Europe. ST-segment elevation myocardial infarction (STEMI) has been a clinical problem for many years, particularly in the aspect of choosing the optimal treatment method. The success of treatment is determined by many factors, including risk factors for ischemic heart disease, time between onset of symptoms and initiation of treatment, number and degree of coronary stenosis, and many more. Aim of the study: The aim of the study was to identify risk factors for ischemic heart disease affecting the success of STEMI patients treated with percutaneous coronary intervention (PCI). Material and methods: A retrospective analysis was carried out on data from medical records of patients treated in the Department of Acute Coronary Syndromes of St. Hedvig Provincial Hospital No. 2 in Rzeszow between 2009 and 2014. The research tool used in this paper was the author’s questionnaire. A total of 508 patients with STEMI myocardial infarction treated in the Department of Acute Coronary Syndromes (ACS) between 2009 and 2013 were included in the analysis. The inclusion criteria were the complete and clear files of patient treatment in the ACS department between 2009 and 2013 due to acute coronary syndrome treated invasively by the PCI method. Results: Majority of the study group, 334 subjects, (65.7%) had hypertension. The most common risk factors for ischemic heart disease were found to be dyslipidemia in 176 subjects (34.6%) and smoking in 163 subjects (32.1%). This paper presents the results of the analysis of the success of treatment in relation to risk factors for ischemic heart disease. There was a statistically significant relationship between hypertension and successful treatment (p=0.0425). More cases in which treatment was unsuccessful were observed in the group of patients who had no previous treatment for lipid disorders (20.2% vs. 4.0%) (p = 0.0000). Significantly more cases of treatment failure were found among people who denied smoking (17.4% vs. 8.6%; p = 0.0087). Conclusions: Among the analyzed behavioral and somatic risk factors for failure in patients subjected to treatment were untreated hypertension, hyperlipidemia and a negative history of cigarette smoking.
    Źródło:
    Medical Science Pulse; 2020, 14, 3; 49-54
    2544-1558
    2544-1620
    Pojawia się w:
    Medical Science Pulse
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zmienność wzrostu promieniowego czterech proweniencji świerka pospolitego w warunkach środkowej Polski
    Variation of radial growth of four Norway spruce provenances in central Poland
    Autorzy:
    Klisz, M.
    Jastrzębowski, S.
    Chojnacka-Ożga, L.
    Kowalczyk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1312093.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    lesnictwo
    drzewa lesne
    dendroklimatologia
    doswiadczenia proweniencyjne
    swierk pospolity
    Picea abies
    proweniencje
    przyrost drzew
    przyrosty radialne
    lata wskaznikowe
    chronologie rezydualne
    chronologie rzeczywiste
    czynniki klimatyczne
    dendrochronology
    climate
    pointer years
    spruceless area
    Opis:
    The purpose of this study was to determine the growth variability of four provenances of Picea abies on experimental plots in the Wyszków Forest District, central Poland. The experiment was established as a system of random blocks with four repetitions per block. We selected 48 trees from each provenance and the increment cores were colected from sample trees. Standard measurements of the width of annual increments were performed using the WinDendro software. Raw data was then indexed and subject to dendroclimatic analyses based on the average monthly temperatures and precipitation of the period from 1969 to 2012. Furthermore, the COFECHA software was used to check the consistency of the data and to determine the pointer years. High data consistency as well as growth variability of particular provenances in response to climatic conditions were observed. The results obtained here will allow for an improved selection of populations best suited for growing in the climate of central Poland.
    Źródło:
    Leśne Prace Badawcze; 2015, 76, 1; 59-65
    1732-9442
    2082-8926
    Pojawia się w:
    Leśne Prace Badawcze
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Corrective factors of intestinal microflora disorders in the perinatal period
    Autorzy:
    Pisaniak, P.
    Huflejt, M.
    Gurowiec, P.J.
    Ozga, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/2088221.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Opolski. Instytut Nauk o Zdrowiu
    Tematy:
    caesarean section
    intenstial microflora
    vaginal seeding
    breastfeeding
    probiotics
    Opis:
    Intestinal microflora is found at approximately 10⁴ bacteria per ml of intestinal fluid. Although this ecosystem is very diverse with dynamic changes taking place within it, there is a certain stability in the type and number of species, referred to as the core microbiome, found in 95% of the human population. Genetic variation of microorganisms is relatively small, and their functions are strictly defined and highly conservative. The microbiome exists symbiotically with the host, protecting it against colonization by pathogenic microorganisms, providing essential metabolites, and stimulating the immune system. Colonization begins prenatally and its development is greatly influenced by the course of pregnancy, method of delivery, food supplied to the child during the first moments of life, and post-birth environment. The appropriate intestinal microflora composition is a key determinant of health and homeostasis, and any intestinal dysbiosis can be associated later in life with the development of obesity, diabetes, allergies or cancer. Due to the increasing number of hospitalised pregnancies and deliveries, affecting the intestinal microflora of a newborn, efforts are being made to minimize this process and restore the newborn’s microbiome. The use of the Vaginal seeding procedure raises up great hopes, but also some fears concerning its safety. Some very simple and most natural factors have been recently also appreciated and promoted, such as breastfeeding or direct contact of the baby’s skin with the mother’s skin, which are allies to probiotic bacteria. The purpose of this paper is to emphasize the importance of microbial colonization of the human body and to present the latest and most effective procedures that are designed to correct the existing dysbiosis or to reduce the risk of its occurrence. The literature for the compilation of this study has been obtained from databases such as PubMed, Google Scholar, Web of Science.
    Źródło:
    Medical Science Pulse; 2019, 13, 3; 68-71
    2544-1558
    2544-1620
    Pojawia się w:
    Medical Science Pulse
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Quietness in the Soundscape of the Białowieża National Park
    Autorzy:
    Wiciak, J.
    Mleczko, D.
    Ozga, A.
    Wszołek, G.
    Wierzbicki, J.
    Piechowicz, J.
    Małecki, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402187.pdf
    Data publikacji:
    2015-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    43.66.-x
    43.66.+y
    87.18.Tt
    87.19.lc
    43.50.Rq
    Opis:
    The quietness, defined as the near or complete absence of sound, in the context of the natural environment protection, may be considered a state in which no undesired of foreign sounds occur, and, by analogy to noise, analyzed in two aspects: that pertaining to measurements and the subjective one. The article discusses the lowest levels of sounds recorded at night in the soundscape of the Białowieża Forest. Due to low levels of the examined sounds and the technical problems that occurred while the sounds were being measured and registered, the acoustic examination of the measurement set-up in an anechoic chamber has also been presented. The research is aimed at defining precisely the concept of quietness prevailing in the nature in the subjective aspect by determining both the range of levels and the characteristics of preferred sounds.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 1A; A-79-A-84
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Weekly urban water demand forecasting using a hybrid waveletbootstrap-artificial neural network approach
    Tygodniowa prognoza zapotrzebowania na wodę w obszarach miejskich określana metodą hybrydową z wykorzystaniem transformaty falkowej-bootstrapu-sztucznej sieci neuronowej
    Autorzy:
    Adamowski, K.
    Adamowski, J.F.
    Seidou, O.
    Ozga-Zielinski, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/81757.pdf
    Data publikacji:
    2014
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
    Opis:
    This study developed a hybrid wavelet–bootstrapartifi cial neural network (WBANN) model for weekly (one week) urban water demand forecasting in situations with limited data availability. The proposed WBANN method is aimed at improving the accuracy and reliability of water demand forecasting. Daily maximum temperature, total precipitation and water demand data for almost three years were used in this study. It was concluded that the hybrid WBANN model was more accurate compared to the ANN, BANN and WANN methods, and can be applied successfully for operational water demand forecasting. The WBANN model simulated peak water demand very effectively. The better performance of the WBANN model indicated that wavelet analysis signifi cantly improved the model’s performance, whereas the bootstrap technique improved the reliability of forecasts by producing ensemble forecasts. The WBANN model was also found to be effective in assessing the uncertainty associated with water demand forecasts in terms of confi dence bands; this can be helpful in operational water demand forecasting.
    W artykule zaproponowano hybrydowy model (WBANN) wykorzystujący transformatę falkową, bootstrap i sztuczną sieć neuronową do opracowania tygodniowej prognozy zapotrzebowania na wodę w obszarach miejskich przy ograniczonej dostępności danych. Proponowany model WBANN ma na celu poprawę trafności i niezawodności prognozowania zaopatrzenia w wodę. W analizach wykorzystane zostały dobowe wartości maksymalnej temperatury, sumy opadów i zapotrzebowania na wodę z 3-letniego okresu obserwacji. Stwierdzono, że hybrydowy model WBANN jest dokładniejszy od modeli ANN, BANN i WANN i z powodzeniem może być użyty do operacyjnego prognozowania zapotrzebo zapotrzebowania na wodę. Model WBANN bardzo skutecznie prognozuje szczytowy popyt na wodę. Dobre wyniki otrzymane z modelu WBANN świadczą o tym, że zastosowana analiza falkowa znacząco poprawiła dokładność modelu, a metoda bootstrapu polepszyła niezawodność (wiarygodność) modelu poprzez prognozowanie ensemblowe. Ocena niepewności z zastosowaniem przedziału ufności wykazała dużą trafność prognoz generowanych przez model WBANN oraz jego przydatność w operacyjnym wykorzystaniu.
    Źródło:
    Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation; 2014, 46, 3
    0208-5771
    Pojawia się w:
    Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Relationship between the Monomer Chain Length and the Electro-Optical Properties of Polymer Dispersed Liquid Crystals
    Autorzy:
    Liu, J.
    Ozga, K.
    Liu, X.
    Zhen, Z.
    Plucinski, K. J.
    Szota, M.
    Kityk, I. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/958219.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    liquid crystal
    electro-optical property
    polymer dispersed
    mesh size
    response time
    Opis:
    Five polymers dispersed liquid crystalline (LC) films were fabricated using photo-polymerizable monomers with different lengths of carbon chains. These LC films have shown different electro-optical (EO) properties. Through their SEM pictures, the relationship between the linear electro-optical effect and the mesh size of the polymer network was explored. With the increase of number of photo-polymerizable monomers, the mesh size of the polymer network would become larger. So the liquid crystal molecules would be easily oriented in the electric field and therefore, the threshold voltage and saturation voltage would decrease. The open state response times were also reduced and the off state response times would be extended. The DFT simulations have shown principal role of the ground state dipole moments in the observed electro-optical efficiency.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 1; 457-460
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Photoinduced Operation by Absorption of the Chalcogenide Nanocrystallite Containing Solar Cells
    Autorzy:
    Elnaggar, A. M.
    Albassam, A.
    Oźga, K.
    Jędryka, J.
    Szota, M.
    Myronchuk, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/357002.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    photovoltaic cell materials
    chalcogenide layers
    photoinduced absorption
    laser treatment
    nanocrystlalline treatment
    Opis:
    It is shown that for the solar cells containing chalcogenide nanocrystallites using external laser light, one can achieve some enhancement of the photovoltaic efficiency. Photoinduced treatment was carried out using two beams of splitted Er: glass laser operating at 1.54 μm. The light of the laser was incident at different angles and the angles between the beams also were varied. Also, the studies of nanocomposite effective structures have shown enhancement of effective nanocrystalline sizes during the laser treatment. Nanocrystallites of CuInS2 and CuZnSnS4 (CZTS) were used as chalcogenide materials. The optimization of the laser beam intensities and nanoparticle sizes were explored.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 4; 1953-1956
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The MFM studies of the surface domain structure of Sm–Fe–Co–Zr–Cu thin ribbons
    Autorzy:
    Dośpiał, M
    Nabiałek, M.
    Szota, M
    Michta, Ł
    Wieczorek, P
    Błoch, K
    Pietrusiewicz, P
    Oźga, K
    Michalczyk, J
    Powiązania:
    https://bibliotekanauki.pl/articles/173524.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    atomic/magnetic force microscopy (AFM/MFM)
    surface domain structure
    melt spinning method
    Sm–Co alloys
    hard magnetic magnets
    Opis:
    The article contains studies of micro- and domain structures obtained using atomic/magnetic force microscopy (AFM/MFM) of melt-spun Sm12.5Fe8Co65.5Zr1Cu13 thin ribbons in the as-cast state. In order to obtain the SmCo8.5 type of structure in the Sm–Fe–Co–Zr–Cu alloy, thin ribbons were manufactured using the melt-spinning method with large linear velocity of a copper wheel and proper selection of alloying elements. The obtained samples in the as-cast state were magnetized. The microscopic results were also supported by magnetic measurements performed on a vibrating sample magnetometer as well as by a quantitative analysis of phase composition obtained using the Rietveld refinement method.
    Źródło:
    Optica Applicata; 2013, 43, 1; 195-200
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural Transition in SrZnO Laser Pulse Deposited Alloy
    Autorzy:
    Albrithen, H. A.
    Elnaggar, M.
    Ozga, K.
    Szota, M.
    Alahmed, Z. A.
    Alanazi, A. Q.
    Alshahrani, H.
    Alfaifi, E.
    Djouadi, M. A.
    Labis, J. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/355190.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    oxide materials
    solid state alloys
    structural phase transition
    X-ray diffraction
    scanning electron microscopy
    Opis:
    We have discovered a structural transition for the SrZnO alloy films from a wurtzite to a rock-salt structure, leading to a reduction in the (112̲0)/(0001) surface energy ratio. The films were grown by pulsed laser deposition using different SrO ratios, x. We have revealed that growth at a higher temperature, 750°C, resulted in a sharp 0002 peak at a low SrO content (5%), whereas growth at a higher SrO content (10%) resulted in a non-crystalline film with minute crystallites with a (112̲0) orientation. Generally the crystallinity decreased as the SrO content increased. No results obtained for the crystalline films showed any orientation of significant peaks besides the peak attributed to the (0001) plane, suggesting epitaxial growth. Optical measurements showed difference in transmission widows of alloys with different SrO percentage, and this was correlated to SrO influence on growth mode as indicated by scanning electron imaging. The studied SrZnO films, with SrO/(SrO + ZnO) ≤ 0.25, were grown by pulsed laser deposition using different SrO ratios, x. The effects of temperature and oxygen pressure during growth on the films’ structural properties were investigated. XRD results indicate that the film crystallinity was improved as the temperature and O2 pressure increased up to 650°C and 0.5 Torr, respectively.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 1; 211-216
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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