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    Wyświetlanie 1-7 z 7
    Tytuł:
    Design and Simulation of 2× 2Micro Strip Circular Patch Antenna Array at 28 GHz for 5G Mobile Station Application
    Autorzy:
    Hasan, Salim Abdullah
    Ahmed, Abdulsattar Mohamed
    Abdulqader, Mohanad Nawfal
    Dawood, Younis Shareef
    Powiązania:
    https://bibliotekanauki.pl/articles/2200728.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    patch
    5G
    return loss
    dielectric
    array
    divider
    substrate
    directivity
    bandwidth
    Opis:
    This paper proposes the design and simulation of 2×2 circular patch antenna array working at 28 GHz by using four inset feed micro strip circular patch antennas to achieve beam forming with directivity around 13dB which is required to overcome part of high path loss challenge for high data rate mm-5G mobile station application. Four element 2x2 array consists of two 1x2 circular patch antenna arrays based on power divider and quarter wavelength transition lines as a matching circuit. The designed antenna array is simulated on RT/duroid 5880 dielectric substrate with properties of 0.5mm thickness, dielectric constant ε r =2.2, and tangent loss of 0.0009 by using Computer System Technology (CST) software. The performances in terms of return loss, 3D–radiation pattern is evaluated at 28 GHz frequency band. The design also includes the possibility of inserting four identical 2x2 antenna arrays at four edges of mobile station substrate to achieve broad space coverage by steering the beams of the mobile station arrays.
    Źródło:
    International Journal of Electronics and Telecommunications; 2022, 68, 4; 721--729
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Technical diagnostics of industrial double twist twinner machine for data cables
    Autorzy:
    Krenický, Tibor
    Ružbarský, Juraj
    Coranič, Tomáš
    Maščeník, Jozef
    Powiązania:
    https://bibliotekanauki.pl/articles/2175488.pdf
    Data publikacji:
    2022
    Wydawca:
    STE GROUP
    Tematy:
    vibrodiagnostics
    maintenance
    twisted pair cables
    return loss
    cable fault
    wibrodiagnostyka
    konserwacja
    kable typu skrętka
    usterka kabla
    Opis:
    The presented article focuses on the diagnostic measurement and evaluation of vibrations of equipment used for data-cable twisted pairing manufacture. A short description of the process of the data cables manufacturing process to which the diagnosed device belongs is provided and the qualitative parameters of the data cables are mentioned. The experimental part is devoted to the experimental diagnostics of the given system in order to locate and identify the possible reason for the occurrence of the parameter´s critical value of the loss of the data cable. When deterioration of electric properties was detected, monitoring the basic oscillation characteristics has been deployed as the key tool to detecting damaged machine parts, and avoiding quality deterioration of the products in the manufacturing process. Finally, the quality of the paired cables after the repair has been confirmed by measurements verifying the efficiency of the measures performed.
    Źródło:
    Systemy Wspomagania w Inżynierii Produkcji; 2022, 11, 2; 35--46
    2391-9361
    Pojawia się w:
    Systemy Wspomagania w Inżynierii Produkcji
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Compact Quasi-Yagi Microstrip Patch Antenna with High Gain and Bandwidth for UWB Application
    Autorzy:
    Chowdhury, Hasanur Rahman
    Hussain, Sakhawa
    Powiązania:
    https://bibliotekanauki.pl/articles/27311937.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    Quasi Yagi microstrip patch antenna
    FR4 substrate
    ultra-wide bandwidth (UWB)
    high antenna gain and low return loss
    Opis:
    A quasi-Yagi microstrip patch antenna with four directors and truncated ground plane has been designed and fabricated to have an ultra-wide bandwidth, high gain, low return loss and better directivity with center frequency at 3.40 GHz. After optimization, the proposed antenna yields an ultra-wide bandwidth of 1.20 GHz with lower and upper cutoff frequencies at 3.12 GHz and 4.32 GHz, respectively. High gain of 5.25 dB, return loss of -28 dB and directivity of 6.28 dB are obtained at resonance frequency of 3.40 GHz. The measured results of fabricated antenna have shown excellent agreement with the simulation results providing bandwidth of 1.34 GHz with lower and upper cutoff frequencies at 3.04 GHz and 4.38 GHz, respectively. The antenna gain of 5.33 dB, return loss of -44 dB are obtained at resonance frequency of 3.36 GHz. The dimension of the antenna is only of 65 mm x 45 mm ensuring compact in size.
    Źródło:
    International Journal of Electronics and Telecommunications; 2023, 69, 3; 431--437
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Family language policy in the context of return migration: A case study
    Autorzy:
    Wąsikiewicz-Firlej, Emilia
    Daly, Michelle
    Powiązania:
    https://bibliotekanauki.pl/articles/14999929.pdf
    Data publikacji:
    2023
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    FLP
    return migration
    heritage language maintenance
    L2 loss
    child agency
    Opis:
    Return migration has probably been granted the lowest attention in the field of family language policy (FLP). The current paper seeks to address this gap in the research and explores the dynamics of FLP of a Polish family in the context of their temporary migration to Germany and return migration to Poland. The authors investigate how mobility affects FLP, especially towards L1 (Polish) and L2 (German) in the context of migration and return migration. The study takes a qualitative, interview-based study design, supported by the language portrait technique. An analysis of the interview data has evidenced the parents’ strong support for the maintenance and development of L1 throughout the whole process of migration and return migration and the lack of it in the case of L2 after the return to Poland. The results have also evidenced that individuals in a family, including children, have significant autonomy and agency and can shape their independ- ent FLPs, which are aligned neither with their parents nor siblings.
    Źródło:
    Glottodidactica. An International Journal of Applied Linguistics; 2023, 50, 1; 213-241
    0072-4769
    Pojawia się w:
    Glottodidactica. An International Journal of Applied Linguistics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    MARKET-BASED MEASURES OF BUSINESS VALUE CREATION AND VALUE FOR SHAREHOLDERS. (Rynkowe miary tworzenia wartości przedsiebiorstwa i wartości dla akcjonariuszy).
    Autorzy:
    Mikolajek-Gocejna, Magdalena
    Powiązania:
    https://bibliotekanauki.pl/articles/599388.pdf
    Data publikacji:
    2010
    Wydawca:
    Wyższa Szkoła Informatyki i Zarządzania z siedzibą w Rzeszowie
    Tematy:
    ABNORMAL RETURN
    EXCESS MVAE
    EXCESS TSR
    MARKET VALUE ADDED (MVA)
    MARKET VALUE ADDED FOR SHAREHOLDERS (MVAE)
    MARKET VALUE LOSS (MVL)
    RELATIVE TSR
    TOTAL SHAREHOLDER RETURN (TSR)
    Opis:
    Measurement of value creation is not simple. The increase in shareholders value will not necessarily mean its creation, because the creation of shareholders value can be defined more or less rigorously. The article focuses attention on market metrics of value: market value added (MVA) and total shareholder return (TSR), as measures the most directly related to the concept of creation value for shareholders. It also describes a distinction between the concept of value creation and value creation for shareholders, discussing their excess forms as well.
    Źródło:
    Finansowy Kwartalnik Internetowy e-Finanse; 2010, Special Issue; 46-63
    1734-039X
    Pojawia się w:
    Finansowy Kwartalnik Internetowy e-Finanse
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the construction of the common optimal market index in the Sharpe model
    Autorzy:
    Kuryłek, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/205979.pdf
    Data publikacji:
    1999
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    regresja liniowa
    zastosowanie teorii systemów w ekonomii
    investment
    linear regression
    loss function
    market index
    maximal eigenvalue
    portfolio analysis
    principal components
    rates of return
    Sharpe model
    stock markets
    Opis:
    The purpose of this paper is to determine one factor which represents the whole market behavior on the basis of the rates of return of all equities traded oo this market. In the seminaal Sharpe model the factor is an exogenous varialble which is not determined by the model itself. This paper extends Sharpe's idea, as it assumes that the factor is a linear combination of all the rates of return of all traded equities. To determine this coefiicients of this linear combination we minimize the loss function which expresses the weighted mean square deviation of all rates of return from their predictions, having given the linear combination form of the market index. It is found that the vector of linear coeffcients has to be a nonzero eigenvector associated with the maximal eigenvalue of the appropriately transformed and estimated covariance matrix. The optimal market index for the Warsaw Stock Exchange was compared with the standard index. It occurs that there is only a very small difference between the standard index of this market and the optimal index.
    Źródło:
    Control and Cybernetics; 1999, 28, 4; 779-787
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Efficiency of functioning of banking institutions in Ukraine
    Efektywność funkcjonowania instytucji bankowych w Ukrainie
    Autorzy:
    Chaikovskyi, Yaroslav
    Chaikovskyi, Yevhen
    Powiązania:
    https://bibliotekanauki.pl/articles/33778359.pdf
    Data publikacji:
    2022-12-05
    Wydawca:
    Zachodniopomorska Szkoła Biznesu w Szczecinie
    Tematy:
    banking sector
    assets
    capital
    liabilities
    income
    expenses
    financial result
    profit
    loss
    return on assets
    return on capital
    bank efficiency
    capital concentration
    Herfindahl-Hirschman index (HHI)
    sektor bankowy
    aktywa
    kapitał
    pasywa
    przychody
    wydatki
    wynik finansowy
    zysk
    strata
    zwrot
    z aktywów
    zwrot z kapitału
    efektywność banku
    koncentracja kapitału
    indeks Herfindahla-Hirschmana (HHI)
    Opis:
    The dynamics and current state of the total number of banks and banks with foreign capital, own funds of the banking system of Ukraine for 2010-01.09.2022 have been analyzed. Quantitative and qualitative trends in the development of the Ukrainian banking system were evaluated and positive and negative features activities of the banking institutions of Ukraine were identified. The reasons that caused the negative consequences of the activity of the banking system of Ukraine were revealed. Directions for reforming the banking sector of Ukraine have been developed, taking into account experience in the conditions of European integration.
    W artykule podjęto tematykę funkcjonowania instytucji bankowych w Ukrainie. Przeanalizowano dynamikę i aktualny stan ogólnej liczby banków, w tym banków z kapitałem zagranicznym oraz fundusze własne systemu bankowego Ukrainy za lata 2010-01.09.2022. Oceniono ilościowe i jakościowe tendencje rozwoju ukraińskiego systemu bankowego oraz zidentyfikowano pozytywne i negatywne cechy działalności instytucji bankowych Ukrainy. Ujawniono przyczyny, które spowodowały negatywne konsekwencje działalności systemu bankowego Ukrainy. Kierunki reformy sektora bankowego Ukrainy zostały opracowane z uwzględnieniem doświadczeń w warunkach integracji europejskiej.
    Źródło:
    Zeszyty Naukowe ZPSB Firma i Rynek; 2022, 2(62); 19-30
    2657-3245
    Pojawia się w:
    Zeszyty Naukowe ZPSB Firma i Rynek
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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