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    Wyświetlanie 1-8 z 8
    Tytuł:
    Precision spectroscopy of cold strontium atoms, towards optical atomic clock
    Autorzy:
    Bober, M.
    Zachorowski, J.
    Gawlik, W.
    Morzyński, P.
    Zawada, M.
    Lisak, D.
    Cygan, A.
    Bielska, K.
    Piwiński, M.
    Trawiński, R.
    Ciuryło, R.
    Ozimek, F.
    Radzewicz, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/201653.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    laser spectroscopy
    cold atoms
    optical atomic clock
    Opis:
    This report concerns the experiment of precision spectroscopy of cold strontium atoms in the Polish National Laboratory of Atomic, Molecular and Optical Physics in Toruń. The system is composed of a Zeeman slower and magneto-optical traps (at 461 nm and 689 nm), a frequency comb, and a narrow-band laser locked to an ultra-stable optical cavity. All parts of the experiment are prepared and the first measurements of the absolute frequency of the 1S0-3P1, 689 nm optical transition in 88Sr atoms are performed.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2012, 60, 4; 707-710
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Prediction of corrections for the Polish time scale UTC(PL) using artificial neural networks
    Autorzy:
    Luzar, M.
    Sobolewski, Ł.
    Miczulski, W.
    Korbicz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/202125.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    neural network
    prediction methods
    national timescale
    atomic clock
    Opis:
    In this paper, the effectiveness of using Artificial Neural Networks (ANNs) for predicting the corrections of the Polish time scale UTC(PL) (Universal Coordinated Time) is presented. In particular, prediction results for the different types of neural networks, i.e., the MLP (MultiLayer Perceprton), the RBF (Radial Basis Function) and the GMDH (Group Method of Data Handling) are shown. The main advantages and disadvantages of using such types of neural networks are discussed. The prediction of corrections is performed using two methods: the time series analysis method and the regression method. The input data were prepared suitable for the above mentioned methods, based on two time series, ts1 and ts2. The designation of prediction errors for specified days and the influence of data quantity for the prediction error are considered. The paper consists of five sections. After Introduction, in Sec. 2, the theoretical background for different types of neural networks is presented. Section 3 shows data preparation for the appropriate type of neural network. The experimental results are presented in Sec. 4. Finally, Sec. 5 concludes the paper.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 3; 589-594
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An Enhanced IEEE1588 Clock Synchronization for Link Delays Based on a System-on-Chip Platform
    Autorzy:
    Wei, Xiaohan
    Xiong, Xingzhong
    Luo, Zhongqiang
    Wang, Jianwu
    Cheng, Kaixing
    Powiązania:
    https://bibliotekanauki.pl/articles/1844640.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    clock synchronization
    fronthaul
    TSN
    system-on-chip
    IEEE 1588
    Opis:
    The clock synchronization is considered as a key technology in the time-sensitive networking (TSN) of 5G fronthaul. This paper proposes a clock synchronization enhancement method to optimize the link delays, in order to improve synchronization accuracy. First, all the synchronization dates are filtered twice to get the good calculation results in the processor, and then FPGA adjust the timer on the slave side to complete clock synchronization. This method is implemented by Xilinx Zynq UltraScale+ MPSoC (multiprocessor system-on-chip), using FPGA+ARM software and hardware co-design platform. The master and slave output Pulse Per-Second signals (PPS). The synchronization accuracy was evaluated by measuring the time offset between PPS signals. Contraposing the TSN, this paper compares the performance of the proposed scheme with some previous methods to show the efficacy of the proposed work. The results show that the slave clock of proposed method is synchronized with the master clock, leading to better robustness and significant improvement in accuracy, with time offset within the range of 40 nanoseconds. This method can be applied to the time synchronization of the 5G open fronthaul network and meets some special service needs in 5G communication.
    Źródło:
    International Journal of Electronics and Telecommunications; 2021, 67, 2; 289-294
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Efficient frequency jumps detection algorithm for atomic clock comparisons
    Autorzy:
    Marszalec, Michał
    Lusawa, Marzenna
    Osuch, Tomasz
    Powiązania:
    https://bibliotekanauki.pl/articles/1848989.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    time interval
    phasetime
    frequency jump
    ensemble time scale
    atomic clock
    Opis:
    In this paper a new method of frequency jumps detection in data from atomic clock comparisons is proposed. The presented approach is based on histogram analysis for different time intervals averaging phasetime data recorded over a certain period of time. Our method allows identification of multiple frequency jumps for long data series as well to almost real-time jump detection in combination with advanced filtering. Several methods of preliminary data processing have been tested (simple averaging, moving average and Vondrak filtration), to achieve flexibility in adjusting the algorithm parameters for current needs which is the key to its use in determining ensemble time scale or to control systems of physical time scales, such as UTC(PL). The best results have been achieved with the Vondrak filter.
    Źródło:
    Metrology and Measurement Systems; 2021, 28, 1; 107-121
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of the GMDH neural network data preparation method on UTC(PL) correction prediction results
    Autorzy:
    Miczulski, W.
    Sobolewski, Ł.
    Powiązania:
    https://bibliotekanauki.pl/articles/221698.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    GMDH neural network
    national timescale
    atomic clock
    time series analysis
    Opis:
    The article presents results of the influence of the GMDH (Group Method of Data Handling) neural network input data preparation method on the results of predicting corrections for the Polish timescale UTC(PL). Prediction of corrections was carried out using two methods, time series analysis and regression. As appropriate to these methods, the input data was prepared based on two time series, ts1 and ts2. The implemented research concerned the designation of the prediction errors on certain days of the forecast and the influence of the quantity of data on the prediction error. The obtained results indicate that in the case of the GMDH neural network the best quality of forecasting for UTC(PL) can be obtained using the time-series analysis method. The prediction errors obtained did not exceed the value of š 8 ns, which confirms the possibility of maintaining the Polish timescale at a high level of compliance with the UTC.
    Źródło:
    Metrology and Measurement Systems; 2012, 19, 1; 123-132
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Biochemical and structural studies of plant circadian clock proteins
    Autorzy:
    Saini, R.
    Szpotkowski, K.
    Kozak, M.
    Jaskolski, M.
    Davis, S.J.
    Powiązania:
    https://bibliotekanauki.pl/articles/80840.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    circadian clock
    diurnal change
    plant circadian clock
    protein
    multiple feedback loop
    crystallization
    recombinant fusion protein
    early flowering
    small angle X-ray scattering
    protein-protein interaction
    biochemical study
    structural study
    Źródło:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2013, 94, 1
    0860-7796
    Pojawia się w:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ascorbate and photosynthesis: how does Arabidopsis adjust leaf ascorbate concentration to light intensity?
    Autorzy:
    Smirnoff, N.
    Page, M.
    Ishikawa, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/80520.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    conference
    ascorbate
    photosynthesis
    Arabidopsis thaliana
    leaf
    photoprotection
    light intensity
    protein expression
    circadian clock
    L-galactose
    Źródło:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2013, 94, 2
    0860-7796
    Pojawia się w:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sampling Jitter in Audio A/D Converters
    Autorzy:
    Kulka, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/177046.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    analog-to-digital converter
    ADC
    successive approximation register (SAR)
    sigma-delta ADC
    sample-and-hold circuit
    DT sigma delta modulator
    CT sigma delta modulator
    time jitter
    aperture jitter
    clock jitter
    periodic clock jitter
    signal-to-noise ratio (SNR)
    Opis:
    This paper provides an overview of the effects of timing jitter in audio sampling analog-to-digital converters (ADCs), i.e. PCM (conventional or Nyquist sampling) ADCs and sigma-delta (ΣΔ) ADCs. Jitter in a digital audio is often defined as short- term fluctuations of the sampling instants of a digital signal from their ideal positions in time. The influence of the jitter increases particularly with the improvements in both resolution and sampling rate of today’s audio ADCs. At higher frequencies of the input signals the sampling jitter becomes a dominant factor in limiting the ADCs performance in terms of signal-to-noise ratio (SNR) and dynamic range (DR).
    Źródło:
    Archives of Acoustics; 2011, 36, 4; 831-849
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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