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    Wyświetlanie 1-9 z 9
    Tytuł:
    An approach to modeling and thermodynamic analysis of modern power engineering systems
    Autorzy:
    Kozaczka, J.
    Kolat, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/185820.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    CCS
    energia
    termodynamika
    modelowanie
    power engineering
    energy
    thermodynamics
    Opis:
    The new efficient method of modeling and thermodynamic analysis of power engineering systems has been presented. With its help a comparison of different structures and investigation of the influence of a particular constituent process onto the whole system efficiency is possible. The shaft work or the energy is the main thermodynamic quantity taken into account in analyses, and the appropriate dimensionless modeling parameter has been introduced.
    Źródło:
    Chemical and Process Engineering; 2011, 32, 4; 401-410
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Crack Detection Using Fluxgate Magnetic Field Sensor
    Autorzy:
    Izgi, T.
    Goktepe, M.
    Bayri, N.
    Kolat, V.
    Atalay, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1207662.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    85.75.Ss
    46.50.+a
    75.50.Kj
    Opis:
    In this study, the variation of the magnetic flux distribution in a magnetised ferromagnetic material which has in homogeneity as a crack is studied. An orthogonal fluxgate magnetic field sensor was used in the inspection of cracks. In the fluxgate sensor, the sensing element $(Co_{0.94}Fe_{0.06})_{72.5}Si_{12.5}B_{15}$ amorphous ferromagnetic wire was placed inside a pickup coil winding with 50 μm copper wire and connected to a signal generator and the output from pick-up coil was detected using a lock-in amplifier. The surface profile of magnetic materials with a crack was obtained using a specially designed 3-dimensional moving system. A large decrease in the output voltage of the sensor was observed when the sensor was moved on the top of the crack, after the further movement of the sensor the output voltage came back to the previous value.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 211-213
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Production of $LaCaMnO_3$ Composite by Ball Milling
    Autorzy:
    Gencer, H.
    Cengiz, N.
    Kolat, V.
    Izgi, T.
    Atalay, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1207685.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.20.Ev
    75.47.Lx
    75.30.Sg
    Opis:
    $La_{0.67}Ca_{0.33}MnO_3$ perovskite-type manganite was synthesized by high-energy ball milling raw oxides of $La_2O_3$ (purity 99.9%), $CaCO_3$ (purity > 99%), and MnO (purity > 99%). The ratio of ball and powder weight was 10:1 and the rotating speed was set to 500 rpm. X-ray analysis indicated that $La_{0.67}Ca_{0.33}MnO_3$ single phase was formed completely when milling time is up to 4 h. The peak intensity of perovskite structure decreased and a hump-like peak appeared with further milling time. When the milling time is longer than 40 h, the perovskite structure disappeared and the amorphous phase was formed completely. Scanning electron microscopy picture of 24 h milled sample showed that the particle size generally varies in a broad range from nanometer scale to a few μm. The magnetic measurements showed that ball milling samples have an inhomogeneous magnetic state and exhibit spin-glass like behavior. The significantly small magnetic entropy change and a remarkably broad temperature interval in entropy change were attributed to high degree of structural and magnetic disorder and broadening of magnetic transition.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 214-216
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experiments on additive desulphurisation by sodium bicarbonate in coal-fuel boiler
    Autorzy:
    Kolat, P.
    Cech, B.
    Vrtek, M.
    Tomasek, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/185695.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    combustion
    desulphurization
    pulverized
    bicarbonate
    spalanie
    odsiarczanie
    dwuwęglan
    Opis:
    This paper describes experiments on the application of sodium bicarbonate desulphurisation in the coal-fuel boiler. The boiler has been in operation for several years now and it has refiably fulfilled the original assignment to reduce SO2 emissions from the value of 1200 -1500 mg/Nm3 to 400 mg/Nm3. Higher desulphurisation efficiency is determined only by the ratio of Na/S sorbent dosage. The resulting product of desulphurisation is stored together with fly ash in underground mines, and has no influence on the groundwater. Positive experience of the tests and boiler operation lies in higher reactivity of sodium and sulphur as compared with conventional methods based on limestone. Within the scope of the secondary measures of elimination of sulphur oxides in combustion products, an experimental dry-method desulphurisation of combustion products was performed by blasting an agent containing sodium bicarbonate NaHCO3 (99.6 %) into the flue ways before the electrostatic precipitator in a coal-fuel furnace with the steam output of 220 t/h.
    Źródło:
    Chemical and Process Engineering; 2013, 34, 1; 77-86
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    YIG Film for Magnetic Field Sensor
    Autorzy:
    Kaya, A.
    Atalay, S.
    Gencer, H.
    Kaya, O.
    Kolat, V.
    Izgi, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401218.pdf
    Data publikacji:
    2015-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.15.Gh
    84.40.Az
    75.30.Ds
    41.20.Jb
    85.75.Ss
    Opis:
    Single crystal $Y_3Fe_5O_{12}$ (YIG) film was grown onto (111) oriented gadolinium gallium garnet (GGG) substrate by the liquid phase epitaxy (PLD) technique. The X-ray diffraction measurements showed that epitaxial growth of the film along its (111) axis. The surface characteristic was investigated by atomic force microscopy (AFM) measurement. The magnetic field sensor consisted of a rectangular shape with 5 mm wide, 15 mm long and 5 μm thick YIG film and a pair of identical 50 μm wide microstrip copper transducers elements separated by 6 mm. The filter was tested by measuring reflection $S_{11}$ characteristic at various bias magnetic fields. The results have showed that when the bias field increased from 0 to 2.5 kOe, the frequency value corresponding to $S_{11}$ maxima increased from 1 GHz to 9 GHz. This suggests that the wide range magnetic field sensing and the highly sensitive field sensing are simultaneously fulfilled with the YIG film.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 4; 937-939
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Field Induced Unusual Magnetic Behavior at Low Temperature in $Pr_{0.67}Ca_{0.33}MnO_3$
    Autorzy:
    Pektas, M.
    Gencer, H.
    Izgi, T.
    Kolat, V.
    Atalay, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1207723.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.47.Lx
    75.30.Kz
    75.30.Sg
    Opis:
    In this study, magnetic properties of $Pr_{0.67}Ca_{0.33}MnO_3$ compound were investigated in detail. The magnetization versus temperature (M-T) curve showed that this material undergoes a charge order transition at 200 K. A more pronounced FM phase appeared below 56 K. At T = 5 K, a field induced sharp step like magnetisation transition associated with phase separation was observed. However, after application of 7 T magnetic field at 5 K, the magnetic behaviour of sample was changed completely and full FM behaviour was observed. The more interesting is that the sample remains in the FM state and does not retrieve the initial magnetic state until warmed up to charge order transition temperature. Large negative magnetic entropy change (- 26.18 J/(kg K) at 38 K and 5 T) was attributed to step like magnetisation transition.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 217-219
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An attempt to assess the accepted model of family in a group of Polish women
    Próba oceny akceptowanego modelu rodziny w wybranej grupie kobiet polskich
    Autorzy:
    Brodziak, Andrzej
    Różyk-Myrta, Alicja
    Białkowska, Barbara
    Kołat, Estera
    Powiązania:
    https://bibliotekanauki.pl/articles/1177621.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Medycyny Wsi
    Tematy:
    birth rate
    model of family
    young women
    Opis:
    Introduction. The authors in their subsequent study on the causes of the fall in the birth rate, based on data obtained by means of questionnaires attempt to verify their next hypotheses, concerning low fertility, observed in most European countries. Material and methods. Data were collected by means of a set of open questions concerning the preferred model of family, and then the characteristic types of responses were identified. Also short complementary questionnaires were used by means of which we tried to assess the pessimistic attitude, low resourcefulness and lack of energy and engagement as well as the intensity of the so-called type D personality pattern. Results. The results led the authors to conclude that young people in Poland are not convinced of the benefits from any specific pattern of the family. The various possible arguments against having children or against having two children discourage easily young couples. Conclusions. The authors think that today there is no “source” of message convincing young people of the proper model of the family in Poland. Theoretically, desirable model of the family (parents + 2 children) is not convincingly promoted by any sources such as parents, school, neighbours or media.
    Wstęp. Autorzy w swojej kolejnej pracy dotyczącej spadku liczby urodzeń, opartej o pobranie danych przy pomocy sondażowych badań ankietowych próbują zweryfikować następne hipotezy dotyczące niskiej dzietności, obserwowanej w większości krajów europejskich. Materiał i metody. Zebrano dane przy pomocy zestawu pytań otwartych, dotyczących preferowanego modelu rodziny, a następnie określono najczęstsze, charakterystyczne typy odpowiedzi. Zastosowano także krótkie ankiety pomocnicze przy pomocy których oceniano stopień postawy pesymistycznej, występowanie niskiej zaradności, przejawy braku energii życiowej oraz nasilenie tzw. wzorca osobowości typu D. Wyniki. Uzyskane wyniki prowadzą autorów do wniosku, że współcześnie młodzi ludzie w Polsce nie są przekonani do zalet określonego wzorca rodziny. Rozmaite możliwe argumenty przemawiające przeciwko posiadaniu dzieci lub przeciwko posiadaniu dwojga dzieci odwodzą łatwo młode małżeństwa i pary od posiadania potomstwa. Wnioski. Autorzy sądzą, że brak jest współcześnie w Polsce „źródła” przekonywującego przesłania o właściwym modelu rodziny. Korzystny (teoretycznie) dla każdej pary model rodziny 2+2 nie jest przekonywująco propagowany przez żadne źródło opiniotwórcze takie jak rodzice, szkoła, sąsiedzi, media.
    Źródło:
    Medycyna Środowiskowa - Environmental Medicine; 2015, 18, 1; 54-61
    1505-7054
    2084-6312
    Pojawia się w:
    Medycyna Środowiskowa - Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Crystallisation Kinetics of Co_{75-x}M_xSi_{15}B_{10} (M = Fe, Mn, Cr and x=0, 5) Amorphous Alloys
    Autorzy:
    Bayri, N.
    Kolat, V.
    Izgi, T.
    Atalay, S.
    Gencer, H.
    Sovak, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398669.pdf
    Data publikacji:
    2016-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Kj
    65.40.-b
    68.55.A-
    Opis:
    In this study, the effect of Fe, Mn and Cr substitution for Co on the crystallization kinetics of amorphous $Co_{75-x}M_xSi_{15}B_{10}$ (M = Fe, Mn and Cr; x=0 and 5) alloys were investigated. The broad diffraction peaks in the X-ray diffraction patterns for as-quenched ribbons indicated that all of the samples exhibit an amorphous structure. The activation energies of the alloys were calculated from differential thermal analysis data using the Kissinger, Ozawa and Augis-Bennett models. The increased activation energy for Fe, Mn and Cr doped samples indicated that the thermal stability and the crystallization kinetics were improved in the doped samples. The value of the Avrami exponent indicated that the crystallization is typical diffusion controlled three-dimensional growth for all of the samples.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 1; 84-87
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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