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    Wyświetlanie 1-14 z 14
    Tytuł:
    Signal processing for time resolved photoluminescence spectroscopy
    Autorzy:
    Grodecki, Kacper
    Murawski, Krzysztof
    Rutkowski, Jarosław
    Kowalewski, Andrzej
    Sobieski, Jan
    Powiązania:
    https://bibliotekanauki.pl/articles/1818197.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Tematy:
    epitaxy
    HgCdTe
    photoluminescence
    time-resolved photoluminescence
    Opis:
    Accurate determination of material parameters, such as carrier lifetimes and defect activation energy, is a significant problem in the technology of infrared detectors. Among many different techniques, using the time resolved photoluminescence spectroscopy allows to determine the narrow energy gap materials, as well as their time dynamics. In this technique, it is possible to observe time dynamics of all processes in the measured sample as in a streak camera. In this article, the signal processing for the above technique for Hg1-xCdxTe with a composition x of about 0.3 which plays an extremely important role in the mid-infrared is presented. Machine learning algorithms based on the independent components analysis were used to determine components of the analyzed data series. Two different filtering techniques were investigated. In the article, it is shown how to reduce noise using the independent components analysis and what are the advantages, as well as disadvantages, of selected methods of the independent components analysis filtering. The proposed method might allow to distinguish, based on the analysis of photoluminescence spectra, the location of typical defect levels in HgCdTe described in the literature.
    Źródło:
    Opto-Electronics Review; 2021, 29, 3; 91--96
    1230-3402
    Pojawia się w:
    Opto-Electronics Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Signal processing for time resolved photoluminescence spectroscopy
    Autorzy:
    Grodecki, Kacper
    Murawski, Kkrzysztor
    Rutkowski, Jarosław
    Kowalewski, Andrzej
    Sobieski, Jan
    Powiązania:
    https://bibliotekanauki.pl/articles/1818200.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Tematy:
    epitaxy
    HgCdTe
    photoluminescence
    time-resolved photoluminescence
    Opis:
    Accurate determination of material parameters, such as carrier lifetimes and defect activation energy, is a significant problem in the technology of infrared detectors. Among many different techniques, using the time resolved photoluminescence spectroscopy allows to determine the narrow energy gap materials, as well as their time dynamics. In this technique, it is possible to observe time dynamics of all processes in the measured sample as in a streak camera. In this article, the signal processing for the above technique for Hg1-xCdxTe with a composition x of about 0.3 which plays an extremely important role in the mid-infrared is presented. Machine learning algorithms based on the independent components analysis were used to determine components of the analyzed data series. Two different filtering techniques were investigated. In the article, it is shown how to reduce noise using the independent components analysis and what are the advantages, as well as disadvantages, of selected methods of the independent components analysis filtering. The proposed method might allow to distinguish, based on the analysis of photoluminescence spectra, the location of typical defect levels in HgCdTe described in the literature.
    Źródło:
    Opto-Electronics Review; 2021, 29, 3; 91--96
    1230-3402
    Pojawia się w:
    Opto-Electronics Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Barrier in the valence band in the nBn detector with an active layer from the type-II superlattice
    Autorzy:
    Kopytko, Małgorzata
    Gomółka, Emilia
    Manyk, Tetiana
    Michalczewski, Krystian
    Kubiszyn, Łukasz
    Rutkowski, Jaroslaw
    Martyniuk, Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/1818207.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Tematy:
    infrared detector
    T2SLs
    superlattice
    III-V materials
    I-V characteristics
    Opis:
    Numerical analysis of the dark current (Id) in the type-II superlattice (T2SL) barrier (nBn) detector operated at high temperatures was presented. Theoretical calculations were compared with the experimental results for the nBn detector with the absorber and contact layers in an InAs/InAsSb superlattice separated AlAsSb barrier. Detector structure was grown using MBE technique on a GaAs substrate. The k·p model was used to determine the first electron band and the first heavy and light hole bands in T2SL, as well as to calculate the absorption coefficient. The paper presents the effect of the additional hole barrier on electrical and optical parameters of the nBn structure. According to the principle of the nBn detector operation, the electrons barrier is to prevent the current flow from the contact layer to the absorber, while the holes barrier should be low enough to ensure the flow of optically generated carriers. The barrier height in the valence band (VB) was adjusted by changing the electron affinity of a ternary AlAsSb material. Results of numerical calculations similar to the experimental data were obtained, assuming the presence of a high barrier in VB which, at the same time, lowered the detector current responsivity.
    Źródło:
    Opto-Electronics Review; 2021, 29, 1; 1--4
    1230-3402
    Pojawia się w:
    Opto-Electronics Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Barrier in the valence band in the nBn detector with an active layer from the type-II superlattice
    Autorzy:
    Kopytko, Małgorzata
    Gomółka, Emilia
    Manyk, Tetiana
    Michalczewski, Krystian
    Kubiszyn, Łukasz
    Rutkowski, Jaroslaw
    Martyniuk, Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/1818204.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Tematy:
    infrared detector
    T2SLs
    superlattice
    III-V materials
    I-V characteristics
    Opis:
    Numerical analysis of the dark current (Id) in the type-II superlattice (T2SL) barrier (nBn) detector operated at high temperatures was presented. Theoretical calculations were compared with the experimental results for the nBn detector with the absorber and contact layers in an InAs/InAsSb superlattice separated AlAsSb barrier. Detector structure was grown using MBE technique on a GaAs substrate. The k·p model was used to determine the first electron band and the first heavy and light hole bands in T2SL, as well as to calculate the absorption coefficient. The paper presents the effect of the additional hole barrier on electrical and optical parameters of the nBn structure. According to the principle of the nBn detector operation, the electrons barrier is to prevent the current flow from the contact layer to the absorber, while the holes barrier should be low enough to ensure the flow of optically generated carriers. The barrier height in the valence band (VB) was adjusted by changing the electron affinity of a ternary AlAsSb material. Results of numerical calculations similar to the experimental data were obtained, assuming the presence of a high barrier in VB which, at the same time, lowered the detector current responsivity.
    Źródło:
    Opto-Electronics Review; 2021, 29, 1; 1--4
    1230-3402
    Pojawia się w:
    Opto-Electronics Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    MCT heterostructures for higher operating temperature infrared detectors designed in Poland
    Autorzy:
    Madejczyk, Paweł
    Gawron, Waldemar
    Sobieski, Jan
    Martyniuk, Piotr
    Rutkowski, Jarosław
    Powiązania:
    https://bibliotekanauki.pl/articles/2204223.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Tematy:
    MCT
    HgCdTe
    metal organic chemical vapour deposition
    infrared detectors
    higher operating temperature
    Opis:
    This paper presents examples of infrared detectors with mercury cadmium telluride elaborated at the Institute of Applied Physics, Military University of Technology and VIGO Photonics S.A. Fully doped HgCdTe epilayers were grown with the metal organic chemical vapour deposition technique which provides a wide range of material composition covering the entire infrared range from 1.5 μm to 14 μm. Fundamental issues concerning the design of individual areas of the heterostructure including: the absorber, contacts, and transient layers with respect to their thickness, doping and composition were discussed. An example of determining the gain is also given pointing to the potential application of the obtained devices in avalanche photodiode detectors that can amplify weak optical signals. Selected examples of the analysis of current-voltage and spectral characteristics are shown. Multiple detectors based on a connection in series of small individual structures are also presented as a solution to overcome inherent problems of low resistance of LWIR photodiodes. The HgCdTe detectors were compared with detectors from III-V materials. The detectors based on InAs/InAsSb superlattice materials achieve very comparable parameters and, in some respects, they are even superior to those with mercury cadmium telluride.
    Źródło:
    Opto-Electronics Review; 2023, 31, Special Issue; art. no. e144551
    1230-3402
    Pojawia się w:
    Opto-Electronics Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The determination of the carriers recombination parameters based on the HOT HgCdTe current-voltage characteristics
    Autorzy:
    Manyk, Tetiana
    Rutkowski, Jarosław
    Madejczyk, Paweł
    Gawron, Waldemar
    Martyniuk, Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/2074201.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Tematy:
    HgCdTe
    MWIR detectors
    dark current
    I-V characteristics
    recombination
    Opis:
    A theoretical analysis of the mid-wavelength infrared range detectors based on the HgCdTe materials for high operating temperatures is presented. Numerical calculations were compared with the experimental data for HgCdTe heterostructures grown by the MOCVD on the GaAs substrates. Theoretical modelling was performed by the commercial platform SimuAPSYS (Crosslight). SimuAPSYS fully supports numerical simulations and helps understand the mechanisms occurring in the detector structures. Theoretical estimates were compared with the dark current density experimental data at the selected characteristic temperatures: 230 K and 300 K. The proper agreement between theoretical and experimental data was reached by changing Auger-1 and Auger-7 recombination rates and Shockley-Read-Hall carrier lifetime. The level of the match was confirmed by a theoretical evaluation of the current responsivity and zero-bias dynamic resistance area product (R0A) of the tested detectors.
    Źródło:
    Opto-Electronics Review; 2022, 30, 2; art. no. e141596
    1230-3402
    Pojawia się w:
    Opto-Electronics Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Theoretical study of back-to-back avalanche photodiodes for dual-band infrared applications
    Autorzy:
    Manyk, Tetiana
    Majkowycz, Kinga
    Rutkowski, Jarosław
    Martyniuk, Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/2204171.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Tematy:
    IR detectors
    HgCdTe avalanche photodiodes
    excess noise
    gain
    dual-band detectors
    Opis:
    The dual-band avalanche photodiode (APD) detector based on a HgCdTe material system was designed and analysed in detail numerically. A theoretical analysis of the two-colour APD intended for the mid wavelength infrared (MWIR) and long wavelength infrared (LWIR) ranges was conducted. The main purpose of the work was to indicate an approach to select APD structure parameters to achieve the best performance at high operating temperatures (HOT). The numerical simulations were performed by Crosslight numerical APSYS platform which is designed to simulate semiconductor optoelectronic devices. The current-voltage characteristics, current gain, and excess noise analysis at temperature T = 230 K vs. applied voltage for MWIR (U = 15 V) and LWIR (U = –6 V) ranges were performed. The influence of low and high doping in both active layers and barrier on the current gain and excess noise is shown. It was presented that an increase of the APD active layer doping leads to an increase in the photocurrent gain in the LWIR detector and a decrease in the MWIR device. The dark current and photocurrent gains were compared. Photocurrent gain is higher in both spectral ranges.
    Źródło:
    Opto-Electronics Review; 2023, 31, 2; art. no. e145093
    1230-3402
    Pojawia się w:
    Opto-Electronics Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Działalność doktora Henryka Jordana na rzecz dzieci i młodzieży. W poszukiwaniu współczesnych odniesień
    Doctor Henryk Jordan’s activity for the benefit of children and adolescents. In search of contemporary references
    Autorzy:
    Rutkowski, Jarosław
    Semrau, Katarzyna
    Powiązania:
    https://bibliotekanauki.pl/articles/29519630.pdf
    Data publikacji:
    2023
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    physical education
    motor games for children and youth
    Doctor Henryk Jordan’s city park
    development environment
    participation
    Opis:
    The activity of Dr. Henryk Jordan played an important role in the development of health education in Galicia, Eastern Europe, in the late 19th and the early 20th centuries. This article revolves around Jordan’s concept of the development of the physical condition of Poles and the physical education system for children and adolescents. Henryk Jordan’s actions have been re-interpreted in the context of building various educational establishments. His efforts, focused on organizing free time for students, were aimed at ensuring their sustainable development. In this respect, the creation of the City Park was Henryk Jordan’s great achievements, serving the physical education of children and adolescents and promotion of mass sport. This organization of public space can be a valuable guideline for architects and educators who create friendly spaces for children and young people. At the same time, the article pinpoints that the target audience and the users are members of local communities whose voices should always be heard and considered. When this happens, they form a relationship with friendly space which takes them into an existential dimension.
    Źródło:
    Biuletyn Historii Wychowania; 2021, 44; 59-79
    1233-2224
    Pojawia się w:
    Biuletyn Historii Wychowania
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Powiatowe centrum pomocy rodzinie w perspektywie kryzysów pieczy zastępczej. W stronę transformacji działania
    District Family Support Center in the Perspective of Foster Care Crises. Towards a Transformation of Action
    Autorzy:
    Rutkowski, Jarosław
    Powiązania:
    https://bibliotekanauki.pl/articles/2194722.pdf
    Data publikacji:
    2022-12-22
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    crises
    dialogue imagination
    thinking
    small actions
    third space
    Opis:
    The article indicates that in the presence of various crises of foster care, there is a confusion of the district family support center, institutions not seeing and not hearing the needs of foster families and orphanages. It is emphasized that the reconstruction of the ability to hear problems and see the complex issues of foster care, for the district aid institution to go beyond the horizon of foster care, crises requires the dialogue and the courage to act in the field of social matters. Then, in the conditions of a local community, where the dialogue is practised, the district family support center regains the ability to see and hear the matters of the wounded world. As a result, the district family support center shapes the capacity of communication activities accompanied with the development of the local community. At the same time, this shift towards district local communities inhabitants’ everyday life is expressed in active care for foster care within the framework of dialogue workshops and educational activities. Such an orientation, in a trialectic perspective, in the weave of three dimensions of space  the internal micro-space of the institution, the meso-space of foster care and the macro-social space of the local community – allows the district family support center to transform its activities in the field of social affairs, and experience the recognition of the inhabitants of local communities.
    Źródło:
    Kultura-Społeczeństwo-Edukacja; 2022, 21, 1; 93-115
    2300-0422
    Pojawia się w:
    Kultura-Społeczeństwo-Edukacja
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Projektowanie wsparcia na rzecz osób z niepełnosprawnościami w perspektywie działań komunikacyjnych. W stronę miejskich warsztatów dialogu
    Designing support for people with disabilities in the perspective of communication activities. Towards municipal dialogue workshops
    Autorzy:
    Rutkowski, Jarosław
    Powiązania:
    https://bibliotekanauki.pl/articles/40411636.pdf
    Data publikacji:
    2022
    Wydawca:
    Uniwersytet Kardynała Stefana Wyszyńskiego w Warszawie
    Tematy:
    Inny
    komunikacja
    warsztat dialogu
    czułość
    spólnota ucząca się
    Opis:
    Osoby z niepełnosprawnościami pozostają często w wydzielonych przestrzeniach życia społecznego, często nie mając warunków do bycia-u-siebie w mieście. Jednocześnie brak widoczności i słyszalności osób z niepełnosprawnością w przestrzeni publicznej stanowi wyzwanie dla współczesnego miasta. Dlatego w ramach projektowania różnych form wsparcia dla osób zależnych, znaczącą rolę przypisać należy działaniom komunikacyjnym. W tekście wskazano, że w mieście uważnym na potrzeby osób z niepełnosprawnościami łatwiej o wzmocnienia aktywności i emancypację tych osób w ramach działań komunikacyjnych. Porozumienie nadaje sens działaniu komunikacyjnemu i w tym znaczeniu przedstawiono wybrane warsztaty dialogu. To w nich tkwi siła rozwoju różnorodnych form wsparcia dla osób zależnych oraz praktyk partycypacyjnych mieszkańców uczące się miasta. Artykuł przedstawia refleksje na temat wsparcia osób z niepełnosprawnościami w perspektywie ich sprawczego działania, aktywności kreacyjnych w mieście. Podkreślono, że w warunkach miasta czułego, w ramach budowania różnorodnych warsztatów dialogu możliwe jest projektowanie w mieście rozwiązań, służących transformacji umniejszonej kondycji życiowej osób z niepełnosprawnościami.
    Źródło:
    Forum Pedagogiczne; 2022, 12, 1; 139-155
    2083-6325
    Pojawia się w:
    Forum Pedagogiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dziedzictwo zakonu pijarów w perspektywie badań Zespołu Szkół Pijarskich w Elblągu
    The legacy of the Piarist order in the perspective of the Piarist School Complex in Elbląg
    Autorzy:
    Semrau, Katarzyna
    Rutkowski, Jarosław
    Powiązania:
    https://bibliotekanauki.pl/articles/1927400.pdf
    Data publikacji:
    2020-03-15
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Opis:
    The aim of the article is to indicate the heritage of the Piarist order in contemporary education. From the very beginning, activity of Piarist monks was directed at poor children and young people, who through education were to become better citizens and Catholics. Nowadays, this heritage is visible in schools run by Piarist monks. One of the school centers is the Piarist School Complex in Elbląg. An interview with the management and teachers, as well as the results of the survey questionnaire collected, allow you to view the modern heritage of Piarist in this school. The article indicates the Piarist School Complex in Elbląg as an example of contemporary piarist activity, which on the one hand is a modern approach to education, and on the other fulfills the assumptions accompanying from the beginning of the activity of piarist education.
    Źródło:
    Biuletyn Historii Wychowania; 2020, 42; 171-184
    1233-2224
    Pojawia się w:
    Biuletyn Historii Wychowania
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Statistical methods for the assessment of students knowledge as illustrated by the Introduction to Internal Medicine exam
    Autorzy:
    Stefański, Adrian Ireneusz
    Bladowska, Natalia
    Więczkowska, Aleksandra
    Wojtyniak, Bogdan
    Ignaszewska-Wyrzykowska, Agata
    Jasiel-Wojculewicz, Hanna
    Jendrzejewski, Jarosław
    Rutkowski, Marcin
    Zdrojewski, Tomasz
    Powiązania:
    https://bibliotekanauki.pl/articles/895821.pdf
    Data publikacji:
    2019-06-04
    Wydawca:
    Gdański Uniwersytet Medyczny
    Tematy:
    exam evaluation
    statistical methodology
    Iinternal medicine
    Opis:
    Background: We wanted to develop substantial and statistical methodology for complex assessment of quality of teaching in internal medicine at a medical university. Our aim was also to check the connection between the results obtained during the midterm and final exam. Material and methods: We compared the results obtained by Polish (PD, n=235) and English Division (ED, n=81) students achieved during the midterm exam and multiple-choice final exam. The mean scores were calculated with t-Student test. For further evaluation Wilcoxon tests were used with the Bonferroni correction, The Stuart-Maxwell test was carried out to verify the hypothesis about correlations between results in the midterm and final exam. Results: The mean midterm exam score was 84.4% in PD and 72.6% in ED (p <0.0001) and mean final exam score was respectively 72.3% and 55.6% (p <0.0001). Good result of the final exam was obtained by 62% of students Conclusions: It is crucial to use appropriate tools to grade the quality of teaching. To evaluate that one should use advance statistical tests. The fact that ED students achieve less points on the exams might have several reasons such as the language barrier. Obtaining a good result during midterm exam does not guarantee passing the final exam.
    Źródło:
    European Journal of Translational and Clinical Medicine; 2019, 2, 1; 22-27
    2657-3148
    2657-3156
    Pojawia się w:
    European Journal of Translational and Clinical Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-14 z 14

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