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    Wyświetlanie 1-8 z 8
    Tytuł:
    Recent Developments on Discontinuous Precipitation
    Autorzy:
    Zięba, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/353282.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    discontinuous precipitation
    discontinuous coarsening
    grain boundary diffusion
    Opis:
    The discontinuous precipitation (DP) belongs to a group of diffusive solid state phase transformations during which the formation of a new phase is heterogeneous and limited to a migrating reaction front (RF). The use of analytical electron microscopy provided reliable information that there is no differences in the diffusion rate at the stationary grain boundary and moving RF of DP reaction. On the other hand, the use of “in situ” transmission electron microscopy observations indicated the importance of stop- go motion or oscillatory movement of the RF. During 2004-2016 period more or less 280 papers were published in which the terms “discontinuous precipitation, “cellular precipitation”, discontinuous coarsening” appeared either in the abstract or in key-words. In the present contribution, the research on the DP reaction will be reviewed taking into account new aspects of theories and modelling, new evidences and findings, effect of various factors including third element, external stresses, plastic deformation and GB orientation, occurrence in less known systems and alloys like: superalloys, nitrided Fe-based alloys and Cu-based alloys. Finally, some suggestions for the future research will be formulated.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 2A; 955-968
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Silicon solar cells efficiency improvement by the wet chemical texturization in the HF/HNO3/diluent solution
    Poprawa sprawności krzemowych ogniw słonecznych poprzez chemiczna tekturyzację w roztworach HF/HNO3/rozpuszczalnik
    Autorzy:
    Kulesza, G.
    Panek, P.
    Zięba, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/351196.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    teksturyzacja
    wytrawianie kwasem
    krzem multikrystaliczny
    krzemowe ogniwa słoneczne
    fotowoltaika
    texturization
    acid etching
    multicrystalline silicon
    silicon solar cells
    photovoltaics
    Opis:
    The paper presents the results of the texturization process of the multicrystalline silicon wafers carried out in ternary HF/HNO3/diluent solution, where the diluent was either CH3COOH or H2O, at varying HF/HNO3 volume ratio and different time of texturization process. The technique of scanning electron microscopy was used to characterize the morphology of the obtained multicrystalline silicon surfaces, with subsequent surface reflectivity measurements. The appropriate selection of mixture components lead to a significant reduction in the reflectivity of the incident solar radiation in the relatively short time of 60 seconds. The resultant electric parameters were nearly the same as those for the commercial samples but obtained after 3 minutes.
    Autorzy zaprezentowali wyniki badań dotyczących procesu teksturyzacji w roztworze HF/HNO3/rozpuszczalnik stosowanego dla płytek krzemu multikrystalicznego, gdzie jako rozpuszczalnik stosowano zamiennie CH3COOH oraz H2O. W badaniach jako zmienne przyjęto objętościowy stosunek HF/HNO3 oraz czas procesu. Morfologia powierzchni uzyskana po chemicznej modyfikacji krzemu została scharakteryzowana przy użyciu skaningowej mikroskopii elektronowej, a następnie zbadano wpływ takiego ukształtowania powierzchni na odbicie promieniowania słonecznego. Autorzy wykazali, że odpowiednie dobranie składu mieszaniny trawiącej pozwala na uzyskanie najniższych wartości odbicia w stosunkowo krótkim czasie 60 sekund. Ponadto parametry elektryczne zmodyfikowanych ogniw słonecznych nie odbiegały od tych uzyskanych komercyjnie w czasie trzykrotnie dłuższym.
    Źródło:
    Archives of Metallurgy and Materials; 2013, 58, 1; 291-295
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Metrological Aspects Of Evaluation of Glass Types Used in Photovoltaic Modules in Laboratory Scale
    Autorzy:
    Starowicz, Z. M.
    Drabczyk, K.
    Gawlińska, K.
    Zięba, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/220981.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    photovoltaics
    silicon solar cells
    module glass cover
    lamination process
    Opis:
    The front glass cover is the crucial part of commercially available silicon solar modules as it provides mechanical protection and environmental isolation. However, from a utility point of view the most important thing is how the glass cover influences the power generation of a photovoltaic (PV) module. Optical matching of the whole structure determines the number of photons absorbed by the solar cells and hence the produced photocurrent. In this study five types of PV glass were optically measured and characterized to find out useful information on transmittance and its character. Then, the results were compared with the electrical parameters of solar mini-modules employing each type of glass. Additionally, the work aimed to providing a low-cost measuring procedure to determine the influence of front glass on photovoltaic performance in small, laboratory scale preserving the Standard Test Conditions. An important aspect was an analysis of different types of glass texture. To confirm properness and adequacy of the analysis, the uncer- tainty aspect was discussed as well.
    Źródło:
    Metrology and Measurement Systems; 2018, 25, 1; 203-211
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of EVA Cross-Linking Degree after Lamination Process by Extraction and Optical Transmission Measuring
    Autorzy:
    Gawlińska, K.
    Drabczyk, K.
    Starowicz, Z.
    Sobik, P.
    Drabczyk, B.
    Zięba, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/352591.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    photovoltaics
    silicon solar cells
    lamination
    gel content test
    cross-linking degree
    Opis:
    The ethylene vinyl acetate (EVA) is widely used for solar modules encapsulation. During lamination process EVA melts and chemical bonds between polymer chains are created. Its number is tightly related to cross-linking degree and it is consider as a major quality reference for module encapsulation. The lamination can be described as a process with two stages: melting and curing where the typical temperature for curing is in the range from 145 to 175°C. In the present study, for the first time, comparison of three commercial available EVA foils with low curing temperature EVA (EVA LOW). For this reason, the temperature of following lamination processes was set from a range from 115 to 175°C. The behavior of cured EVA films under investigation EVA was determined with two approaches: with extraction and with optical methods. The results indicate the applicability of these methods for the EVA cross-linking characterization. Finally, the extraordinary behavior of EVA LOW foil was noticed.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 2; 833-838
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Diffusive and Displacive Phase Transformations in Nanocomposites under High Pressure Torsion
    Autorzy:
    Straumal, B.
    Kilmametov, A.
    Gornakova, A.
    Mazilkin, A.
    Baretzky, B.
    Korneva, A.
    Zięba, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/356575.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    high-pressure torsion
    Ti-Fe alloys
    phase transitions
    high-pressure phases
    Opis:
    The high-pressure torsion (HPT) of Ti-Fe alloys with different iron content has been studied at 7 GPa, 5 anvil rotations and rotation speed of 1 rpm. The alloys have been annealed before HPT in such a way that they contained different amounts of α/α' and β phases. In turn, the β phase contained different concentration of iron. The 5 anvil rotations correspond to the HPT steady-state and to the dynamic equilibrium between formation and annihilation of microstructure defects. HPT leads to the transformation of initial α/α' and β-phases into mixture of α and high-pressure ω-phase. The α → ω and β → ω phase transformations are martensitic, and certain orientation relationships exist between α and ω as well as β and ω phases. However, the composition of ω-phase is the same in all samples after HPT and does not depend on the composition of β-phase (which is different in different initial samples). Therefore, the martensitic (diffusionless) transformations are combined with a certain HPT-driven mass-transfer. We observed also that the structure and properties of phases (namely, α-Ti and ω-Ti) in the Ti – 2.2 wt. % Fe and Ti – 4 wt. % Fe alloys after HPT are equifinal and do not depend on the structure and properties of initial α'-Ti and β-Ti before HPT.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 2; 457-465
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Black Silicon Obtained in Two-Step Short Wet Etching as a Texture for Silicon Solar Cells - Surface Microstructure and Optical Properties Studies
    Autorzy:
    Kulesza-Matlak, G.
    Gawlińska, K.
    Starowicz, Z.
    Sypień, A.
    Drabczyk, K.
    Drabczyk, B.
    Lipiński, M.
    Zięba, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/352242.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    black silicon
    low temperature texturization
    silicon nanowire
    solar cells
    multicrystalline silicon
    Opis:
    In this study a two-step short wet etching was implemented for the black silicon formation. The proposed structure consists of two steps. The first step: wet acidic etched pits-like morphology with a quite new solution of lowering the texturization temperature and second step: wires structure obtained by a metal assisted etching (MAE). The temperature of the process was chosen due to surface development control and surface defects limitation during texturing process. This allowed to maintain better minority carrier lifetime compared to etching in ambient temperature. On the top of the acidic texture the wires were formed with optimized height of 350 nm. The effective reflectance of presented black silicon structure in the wavelength range of 300-1100 nm was equal to 3.65%.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 2; 1009-1017
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Antimicrobial activity of some plant extracts against bacterial pathogens isolated from faeces of red deer (Cervus elaphus)
    Autorzy:
    Gnat, S.
    Zięba, P.
    Majer-Dziedzic, B.
    Nowakiewicz, A.
    Trościańczyk, A.
    Ziółkowska, G.
    Jesionek, W.
    Choma, I.
    Dziedzic, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2087857.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Źródło:
    Polish Journal of Veterinary Sciences; 2017, 4; 697-706
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Standard Deviation of the Mean of Autocorrelated Observations Estimated with the Use of the Autocorrelation Function Estimated From the Data
    Autorzy:
    Zięba, A.
    Ramza, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/220588.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    autocorrelated data
    time series
    effective number of observations
    estimators of variance
    measurement uncertainty
    Opis:
    Prior knowledge of the autocorrelation function (ACF) enables an application of analytical formalism for the unbiased estimators of variance s²a and variance of the mean s²a(x‾). Both can be expressed with the use of so-called effective number of observations neff. We show how to adopt this formalism if only an estimate {rk} of the ACF derived from a sample is available. A novel method is introduced based on truncation of the {rk} function at the point of its first transit through zero (FTZ). It can be applied to non-negative ACFs with a correlation range smaller than the sample size. Contrary to the other methods described in literature, the FTZ method assures the finite range 1 < nˆeff ≤ n for any data. The effect of replacement of the standard estimator of the ACF by three alternative estimators is also investigated. Monte Carlo simulations, concerning the bias and dispersion of resulting estimators sa and sa(x‾), suggest that the presented formalism can be effectively used to determine a measurement uncertainty. The described method is illustrated with the exemplary analysis of autocorrelated variations of the intensity of an X-ray beam diffracted from a powder sample, known as the particle statistics effect.
    Źródło:
    Metrology and Measurement Systems; 2011, 18, 4; 529-542
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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