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    Wyświetlanie 1-5 z 5
    Tytuł:
    Dynamical and tuneable modulation of the Tamm plasmon/exciton-polariton hybrid states using surface acoustic waves
    Autorzy:
    Buller, J.
    Cerda-Méndez, E.
    Balderas-Navarro, R.
    Santos, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1156776.pdf
    Data publikacji:
    2016-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.36.+c
    42.55.Sa
    85.50.-n
    Opis:
    In this work, we discuss theoretically the formation of the Tamm plasmon/exciton-polariton hybrid states in an (Al,Ga)As microcavity and their modulation by surface acoustic waves. The modulation of the Tamm plasmon/exciton-polariton states origins in the change of the excitonic band gap energy and the thickness change of the sample structure layers due to the induced strain fields by surface acoustic waves. The frequency f_{SAW} of the acoustic modulation of the Tamm plasmon/exciton-polariton states is limited by the thickness of the upper distributed Bragg reflector. For the Tamm plasmon/exciton-polariton states in Al_xGa_{1-x}As/GaAs structures f_{SAW} is in the range of 370 MHz while f_{SAW} in GHz range is possible for the parametric Tamm plasmon/exciton-polariton states. In both cases, the acoustic modulation is several meV for typical acoustic power levels.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 1a; A-26-A-29
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of ZrO₂ Addition on the Structure and Dielectric Properties of BaTiO₃ Ceramics
    Autorzy:
    Oksuz, K.
    Sen, S.
    Sen, U.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032539.pdf
    Data publikacji:
    2017-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    85.50.-n
    77.84.-s
    82.45.Xy
    81.30.-t
    Opis:
    Ba(Ti_{1-x}Zr_{x})O₃ (x=0÷0.3) ceramics were prepared by the standard solid state reaction method and were sintered at 1450°C for 4 h. The structural and dielectric properties of the samples were studied. The phases formed in the ZrO₂ doped BaTiO₃ were tetragonal and of cubic symmetry. Increase in ZrO₂ content in the BaTiO₃ caused to increase of the lattice parameter and crystallite size of the perovskite structure. The evolution of the Raman spectra was studied for various compositions and the spectroscopic signature of the corresponding phase was determined. The scanning electron microscope was used to investigate the microstructure and surface morphology of the sintered samples. Scanning electron microscope observations revealed enhanced microstructural uniformity and retarded grain growth with increase of ZrO₂ content. Dielectric characteristics of ZrO₂ doped barium titanate were studied using a Hioki 3532-50 LCR meter in the frequency range of 1 kHz-1 MHz. It is found that the dielectric constant (ε_{r}) increases while the dielectric loss (tan δ) decreases with increase in zirconium oxide content (x<0.3).
    Źródło:
    Acta Physica Polonica A; 2017, 131, 1; 197-199
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Efficiency Measurements of Ultrasonic Generator for Welding
    Autorzy:
    Kardyś, W.
    Milewski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401919.pdf
    Data publikacji:
    2015-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.20.Vj
    43.35.-c
    43.35.+d
    77.65.Dq
    77.84.Cg
    85.50.-n
    Opis:
    The paper presents results of theoretical analysis as well as practical measurements of efficiency in ultrasonic welding system with main focus on ultrasonic generator. Through analysis and tests were performed using 3 kW 20 kHz Sonic Blaster ultrasonic generator manufactured by ITR. Special equipment was used to perform accurate measurements of input and output power of such generator since an output signal of the ultrasonic generator has high voltage amplitude up to 3 kV and frequency of 20 kHz. Artificial load able to dissipate up to 6 kW of continuous power was designed to simulate ultrasonic transducer. Power measurements were performed on the mains supply of the generator using accurate true RMS power meter and load side measurements were performed using specially built power metering system able to measure high voltage 20 kHz signals based on calibrated high voltage resistive divider and high frequency current transducer.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 3; 456-460
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Universal Ultrasonic Generator for Welding
    Autorzy:
    Kardyś, W.
    Milewski, A.
    Kogut, P.
    Kluk, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399360.pdf
    Data publikacji:
    2013-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.20.Vj
    43.35.-c
    43.35.+d
    77.65.Dq
    77.84.Cg
    85.50.-n
    Opis:
    The paper presents design and parameters of a multifunction ultrasonic generator manufactured by Tele and Radio Research Institute. Efficient usage of ultrasonic welding and cutting technology depends on the ability to precisely control process parameters and tune those parameters to suit particular needs. Ultrasonic generator is responsible for such control and tuning. Presented design incorporates powerful 32 bit Cortex M4 microcontroller with floating point unit which allows using modern signal processing methods to calculate parameters of ultrasonic stack in real time. Calculated parameters, especially impedance of the stack are used to estimate load level and identify phases of the welding process such as melting of the welded material. Precise control of the output signal is possible due to innovative design of the direct digital signal synthesis unit implemented in programmable logic device (CPLD). Resonant inverter topology of the generator front end ensures high electrical efficiency of the device. Designed generator is equipped with various communication interfaces such as USB host and slave, Ethernet, Bluetooth, CAN and RS485. Multiple digital inputs and outputs together with load cell interface, 4-20 mA receiver and 0-10 V analog input enable the generator to monitor and control entire ultrasonic welding system without the need of a PLC unit.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 3; 456-458
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Distortion of the Positron Lifetime Spectra in BaF$\text{}_{2}$ Spectrometers
    Autorzy:
    Goworek, T.
    Górniak, W.
    Wawryszczuk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1858021.pdf
    Data publikacji:
    1993-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    06.50.Dc
    07.85.+n
    Opis:
    High efficiency of BaF$\text{}_{2}$ scintillators creates the risk of distortion of the positron lifetime distributions due to summing and backscattering. In the 180° geometry it leads to the appearance of a spurious shortlived component.
    Źródło:
    Acta Physica Polonica A; 1993, 83, 3; 307-311
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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