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    Wyświetlanie 1-7 z 7
    Tytuł:
    Dobór parametrów konstrukcyjnych silnika reluktancyjnego przełączalnego oraz ich wpływ na charakterystyki statyczne momentu
    Assortment of constructional parameters of Switched Reluctance Motor and their influence on static torque characteristics
    Autorzy:
    Bieńkowski, K.
    Rogalski, A.
    Flaszczyński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2076297.pdf
    Data publikacji:
    2005
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
    Tematy:
    silnik reluktancyjny przełączalny
    SRM
    silniki elektryczne
    charakterystyka statyczna
    moment
    Opis:
    The influences of geometrical parameters of three phase 12/8 SRM on static torque were presented on this paper. Electromagnetic torque was obtained in result of solving FEM magnetostatic model of the motor. Assortment of internal stator diameter, breaths of the poles in dependence of external stator diameter for maximum torque was presented.
    Źródło:
    Maszyny Elektryczne: zeszyty problemowe; 2005, 73; 107-112
    0239-3646
    2084-5618
    Pojawia się w:
    Maszyny Elektryczne: zeszyty problemowe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Model tests of fast units on the open waters of Jeziorak Lake
    Autorzy:
    Brzoska, E.
    Grygorowicz, M.
    Krężelewski, M.
    Rogalski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/258512.pdf
    Data publikacji:
    2007
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    fast units
    single hull
    twin hull
    model tests
    speedboats
    Opis:
    Paper presents model tests of fast units carried out in the years 1956-2000 in the Experimental Centre of the Gdansk University of Technology Shipbuilding Institute on Jeziorak Lake. The experimental tests included single- and twin-hull hydrofoils, amphibian hovercraft, side-wall hovercraft and also speedboats and SWATH type catamarans. The aim of those tests was to acquire data for developing the design and safety criteria as well as computer programs for predicting the hydrodynamic properties of fast units. The gathered experimental material was used in the theoretical studies, publications and conference papers.
    Źródło:
    Polish Maritime Research; 2007, S 2; 3-7
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Doing Hirsch proud; shaping H-index in engineering sciences
    Autorzy:
    Czarnecki, L.
    Kaźmierkowski, M.
    Rogalski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/202004.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    bibliometric indicators
    citations
    citation metrics
    h-index
    country rank
    SCImago indicator
    disciplines
    domestic Engineering sub-disciplines
    statistics
    Opis:
    The h-index concept has been analysed in aspects of a contemporary tendency of parameterisation of everything and as the potential measure of the knowledge progress, which recognises individuals, institutions and Engineering sub-disciplines that best generate new knowledge. Considerations have been presented at the level of universality of knowledge which implies permanent progress and on the base of careful thoughts of the domestic experience. The h-nature of things has been described, and several axiomatic characterisations of the Hirsch index have been gathered. The mechanism how to increase the h-index has been presented. Some similarities between h-index and the journal impact factor (JIF) have been stressed. Also the universal role of H-index in ranking countries in all areas and in Engineering has been exampled in extended tables. The Glänzel’s model which connects the h-index with two fundamental scientometric indicators: number of publications and the rate of citation, has been analysed. Following the Microsoft Academic Search, the lists of 15 top scientists from various academic disciplines and separately in Engineering have been composed. It has been found that the population of the best keeps basically the same relations between the h-index and a number of publication, and between the h-index and a citation number. However, even the best in Engineering should publish 2 times a year or more papers to receive the same h-index as top scientists in overall domains. The h-index distribution of domestic Engineering sub-disciplines has been presented and analysed in statistic categories. The suitable hhistograms and the cumulative probability density function (CPDF) have been elaborated for 21 sub-disciplines and thereupon the Engineering sub-disciplines have been arranged into three clusters. It has been demonstrated that Engineering as the whole and Engineering sub-disciplines are underestimated, compared to other academic disciplines. The adequate normalisation factors have been suggested. Several other conclusions considered the h,H-indices as the measure of the knowledge progress addressed to individual researchers and to collective, e.g., journals, institutions, organisations, countries, adequately have been written. The h,H-indices are the general measure of the position of the given subject (person or organisation) but cannot be universal.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 1; 5-21
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of performance limits of the HOT HgCdTe photodiodes with colloidal quantum dot infrared detectors
    Autorzy:
    Rogalski, A.
    Kopytko, M.
    Martyniuk, P.
    Hu, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/201444.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    colloidal quantum dot infrared photodetectors
    HOT infrared detectors
    HgCdTe photodiodes
    p-i-n depleted photodiodes
    BLIP performance
    Opis:
    In the past decade, there has been significant progress in development of the colloidal quantum dot (CQD) photodetectors. The QCD’s potential advantages include: cheap and easy fabrications, size-tuneable across wide infrared spectral region, and direct coating on silicon electronics for imaging, which potentially reduces array cost and offers new modifications like flexible infrared detectors. The performance of CQD high operating temperature (HOT) photodetectors is lower in comparison with detectors traditionally available on the global market (InGaAs, HgCdTe and type-II superlattices). In several papers their performance is compared with the semiempirical rule, “Rule 07” (specified in 2007) for P-on-n HgCdTe photodiodes. However, at present stage of technology, the fully-depleted background limited HgCdTe photodiodes can achieve the level of room-temperature dark current considerably lower than predicted by Rule 07. In this paper, the performance of HOT CQD photodetectors is compared with that predicted for depleted P-i-N HgCdTe photodiodes. Theoretical estimations are collated with experimental data for both HgCdTe photodiodes and CQD detectors. The presented estimates provide further encouragement for achieving low-cost and high performance MWIR and LWIR HgCdTe focal plane arrays operating in HOT conditions.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 4; 845-855
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The predictions of resistance and propulsion for 4 types of ships
    Autorzy:
    Brzoska, E.
    Grygorowicz, M.
    Rogalski, A.
    Stasiak, J.
    Szantyr, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/962774.pdf
    Data publikacji:
    2004
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    model tests
    ship resistance in calm water
    ship resistance in inegular waves
    POD propulsors
    Opis:
    In this paper the predictions of resistance and propulsion for 4 types of ships: container carrier, oil product tanker, ro-ro vessel and river-sea vessel included in the EUREKA "Baltecologicalship" project E!2772 are presented. All the above ships were designed by the SINUS Enterprise Ltd. The scope of the research covers: experimental measurement of ship resistance in calm water, determination of resistance increment in irregular waves and computational powering prediction for POD propulsors. The experiments were conducted in the Laboratory of the Department of Underwater Technology, Hydromechanics and Design of Ships, Faculty of Ocean Engineering and Ship Technology, Gdansk University of Technology.
    Źródło:
    Polish Maritime Research; 2004, S 1; 34-38
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mid-wave InAs/GaSb superlattice barrier infrared detectors with nBnN and pBnN design
    Autorzy:
    Gomółka, E.
    Markowska, O.
    Kopytko, M.
    Kowalewski, A.
    Martyniuk, P.
    Rogalski, A.
    Rutkowski, J.
    Motyka, M.
    Krishna, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/201992.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    InAs/GaSb type-II superlattices
    infrared detectors
    barrier detectors
    nBn detector
    p-i-n detector
    InAs
    GaSb
    detektory podczerwieni
    detektor bariery
    detektor nBn
    detektory p-i-n
    Opis:
    We present an investigation of optical and electrical properties of mid-wavelength infrared (MWIR) detectors based on InAs/GaSb strained layer superlattices (SLs) with nBnN and pBnN design. The temperature-dependent behavior of the bandgap was investigated on the basis of absorption measurements. A 50% cut-off wavelength of around 4.5 μm at 80 K and increase of up to 5.6 μm at 290 K was found. Values of Varshni parameters, zero temperature bandgap E0 and empirical coefficients α and β were extracted. Arrhenius plots of dark currents of nBnN and pBnN detectors were compared with the p-i-n design. Dark current density reduction in nBnN and pBnN detectors is observed in comparison to the p-i-n device. This shows a suppression of Shockley-Read-Hall (SRH) processes by means of introducing barrier architecture.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2018, 66, 3; 317-323
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fast Response Hot (111) HGCDTE MWIR Detectors
    Autorzy:
    Grodecki, K.
    Martyniuk, P.
    Kopytko, M.
    Kowalewski, A.
    Stępień, D.
    Kębłowski, A.
    Piotrowski, A.
    Piotrowski, J.
    Gawron, W.
    Rogalski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/221254.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    HgCdTe
    MWIR
    photodetector
    response time
    Opis:
    In this work we report simulation and experimental results for an MWIR HgCdTe photodetector designed by computer simulation and fabricated in a joint laboratory run by VIGO Sytems S.A. and Military University of Technology. The device is based on a modified N+pP+ heterostructure grown on 2”., epiready, semi-insulating (100) GaAs substrates in a horizontal MOCVD AIX 200 reactor. The devices were examined by measurements of spectral and time responses as a function of a bias voltage and operating temperatures. The time response was measured with an Optical Parametric Oscillator (OPO) as the source of ~25 ps pulses of infrared radiation, tuneable in a 1.55–16 μm spectral range. Two-stage Peltier cooled devices (230 K) with a 4.1 μm cut-off wavelength were characterized by 1.6 × 1012 cm Hz1/2/W peak detectivity and < 1 ns time constant for V > 500 mV.
    Źródło:
    Metrology and Measurement Systems; 2017, 24, 3; 509-514
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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