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    Wyświetlanie 1-5 z 5
    Tytuł:
    The Influence of Alarm Siren Structure Parameters on Output Sound Pressure Level
    Autorzy:
    Wiciak, J.
    Dąbrowski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1490306.pdf
    Data publikacji:
    2012-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    43.38.Fx
    43.40.At
    77.65.Bn
    Opis:
    The paper is a discussion of the construction of an alarm siren based on the active piezoelectric element. The influence of various parameters on the loudness of the siren was investigated. Efforts to increase the efficiency of selected design were made. The simulations carried out based on an ANSYS. Individual dimensions of a piezoelectric transducer were selected as well as a collaborate diaphragm. The possibility of using different piezoelectric materials was also analyzed. All tasks and computer simulations were aimed at receiving a siren structure able to obtain the highest sound pressure level at selected frequency.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 1A; A-136-A-141
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electrical, Electromechanical and Piezoelectric Properties of Ca₃TaGa₃Si₂O₁₄ Resonators at Elevated Temperatures
    Autorzy:
    Suhak, Yu.
    Schulz, M.
    Sotnikov, A.
    Schmidt, H.
    Fritze, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030925.pdf
    Data publikacji:
    2018-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    77.65.Bn
    77.84.-s
    43.58.Bh
    07.20.Ka
    Opis:
    The electrical conductivity, resonance frequency and piezoelectric strain constants are determined for ordered piezoelectric Ca₃TaGa₃Si₂O₁₄ (CTGS) single crystals from room temperature to 900°C. The latter result from three independent methods, namely resonant, ultrasonic pulse-echo, and laser Doppler vibrometry techniques, which allows validating the results. Further, the long-term behaviour of fundamental materials properties including electrical conductivity and resonance frequency are examined at 1000°C for CTGS crystals, grown by different manufacturers. After an initial period of about 500 h, the conductivity is found to remain nearly constant for at least 1500 h. In a period of 2000-5000 h a decrease of conductivity by only 20% is observed. The resonance frequency is found to decrease almost linearly in a period of 500-5000 h for all investigated samples.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 4; 1069-1073
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Piezoelectric Effect in Strained CdTe-Based Heterostructures
    Autorzy:
    Cibert, J.
    Andre, R.
    Le Si, Dang
    Powiązania:
    https://bibliotekanauki.pl/articles/1933682.pdf
    Data publikacji:
    1995-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.66.Ηf
    78.20.Ηp
    77.65.Bn
    Opis:
    Strained III-V or II-VI heterostructures grown along a polar axis incorporate a piezoelectric field which strongly alters their electronic properties. We review some experimental studies of this built-in field, and its consequences, in CdTe-CdMnTe and CdTe-CdZnTe heterostructures. This includes: (i) the measure of the built-in field, with as an example the dependence of the piezoelectric coefficient on bond length; (ii) the description of the exciton formed by an electron and a hole which can be continuously separated in space by the piezoelectric field; (iii) some examples of the extreme sensitivity to any additional electric field.
    Źródło:
    Acta Physica Polonica A; 1995, 88, 4; 591-600
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulations of Si and $SiO_{2}$ Etching in $SF_{6}+O_{2}$ Plasma
    Autorzy:
    Knizikevičius, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1538692.pdf
    Data publikacji:
    2010-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    52.77.Bn
    81.65.Rv
    Opis:
    The plasma chemical etching of Si and $SiO_{2}$ in $SF_{6}+O_{2}$ plasma is considered. The concentrations of plasma components are calculated by fitting the experimental data. The derived concentrations of plasma components are used for the calculation of Si and $SiO_{2}$ etching rates. It is found that the reaction probabilities of F atoms with Si atoms and $SiO_{2}$ molecules are equal to ε = (8.75 ± 0.41) × $10^{-3}$ and ε = (7.18 ± 0.45) × $10^{-5}$, respectively. The influence of $O_{2}$ addition to $SF_{6}$ plasma on the etching rate of Si is determined.
    Źródło:
    Acta Physica Polonica A; 2010, 117, 3; 478-483
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Atomic Force Microscopy and Quartz Crystal Microbalance Study of the Lectin-Carbohydrate Interaction Kinetics
    Autorzy:
    Lebed, K.
    Kulik, A. J.
    Forró, L.
    Lekka, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047270.pdf
    Data publikacji:
    2007-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.64.Dz
    84.37.+q
    87.15.Kg
    82.37.Np
    81.65.Cf
    52.77.Bn
    Opis:
    Two analytical methods, atomic force microscopy and quartz crystal microbalance, were applied to the study of the reaction kinetics occurring between concanavalin A and carboxypeptidase Y, presenting the specific lectin-carbohydrate recognition. The dissociation rate constants for concanavalin A-carboxypeptidase Y complex obtained using both atomic force microscopy and quartz crystal microbalance were of the same order of magnitude: k$\text{}_{diss}$=0.170± 0.060 s$\text{}^{-1}$ and k$\text{}_{diss}$=0.095±0.002 s$\text{}^{-1}$, respectively. In addition, each method alone aided in determining other parameters characterizing the studied interaction. Quartz crystal microbalance permitted us to estimate the association rate (k$\text{}_{ass}$=(5.6 ±0.1)×10$\text{}^{4}$ M$\text{}^{-1}$ s$\text{}^{-1}$) and the equilibrium (K$\text{}_{a}$=(0.59×0.01)×10$\text{}^{6}$ M$\text{}^{-1}$) constants for the binding process occurring between concanavalin A and mannose residues of carboxypeptidase Y under given experimental conditions. Atomic force microscopy in force spectroscopy mode enabled the determination of the energy barrier position of r=2.29±0.04 Å characterizing the dissociation of concanavalin A- carboxypeptidase Y molecular complex. The presented results show that both atomic force microscopy and quartz crystal microbalance can be used to determine quantitative parameters characterizing the specific molecular interaction. Both methods can be easily combined for complementary and/or alternative studies of a chosen molecular interaction. By preparing the samples in the same manner the direct comparison between the data obtained via atomic force microscopy and quartz crystal microbalance can be made.
    Źródło:
    Acta Physica Polonica A; 2007, 111, 2; 273-286
    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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