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    Wyświetlanie 1-7 z 7
    Tytuł:
    Rapid Synthesis of Gold Nano-Particles Using Pulse Waved Potential in a Non-Aqueous Electrolyte
    Autorzy:
    Jang, J. G.
    Lee, J.-O.
    Lee, C. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/352529.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    gold
    nanoparticle
    nonaqueous electrolyte
    pulse wave
    catalyst
    Opis:
    Rapid synthesis of gold nanoparticles (AuNPs) by pulsed electrodeposition was investigated in the non-aqueous electrolyte, 1-ethyl-3-methyl-imidazoliumbis(trifluoro- methanesulfonyl)imide ([EMIM]TFSI) with gold trichloride (AuCl3). To aid the dissolution of AuCl3, 1-ethyl-3-methyl-imidazolium chloride ([EMIM]Cl) was used as a supporting electrolyte in [EMIM]TFSI. Cyclicvoltammetry experiments revealed a cathodic reaction corresponding to the reduction of gold at −0.4 V vs. Pt-QRE. To confirmthe electrodeposition process, potentiostatic electrodeposition of gold in the non-aqueous electrolyte was conducted at −0.4 V for 1 h at room temperature. To synthesize AuNPs, pulsed electrodeposition was conducted with controlled duty factor, pulse duration, and overpotential. The composition, particle-size distribution, and morphology of the AuNPs were confirmed by field-emission scanning electron microscopy (FE-SEM), energy-dispersive spectroscopy (EDS), and transmission electron microscopy (TEM). The electrodeposited AuNPs were uniformly distributed on the platinum electrode surface without any impurities arising from the non-aqueous electrolyte. The size distribution of AuNPs could be also controlled by the electrodeposition conditions.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 2B; 1389-1392
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Two-point Method for Arterial Local Pulse Wave Velocity Measurement by Means of Ultrasonic RF Signal Processing
    Autorzy:
    Trawiński, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/178000.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ultrasound
    local pulse wave velocity
    model of artery
    Opis:
    The aim of this paper is to describe a non-invasive method of examination of the local pulse wave velocity. The measurements were carried out in the model of the artery immersed in a water tank. Two synchronized ultrasonic apparatus VED with the ultrasonic radio frequency echoes acquisition system were used for evaluation of the arterial elasticity. The zero-crossing method was used for determination of the diameter changes of the artery model. The transit time between the waveforms of instant artery diameter was measured at two points of the artery model, separated by the distance of 5 cm. The transit time was determined using the criteria of similarity of the first derivatives of the raising slopes of the curves describing instant vessel’s diameter changes. The pulse wave velocity obtained by the proposed twopoint method was compared with the results obtained by the one-point method based on the modified Bramwell–Hill relation.
    Źródło:
    Archives of Acoustics; 2010, 35, 1; 3-11
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of measurement position on brachial–ankle pulse wave velocity
    Autorzy:
    Shimawaki, S.
    Toda, M.
    Nakabayashi, M.
    Sakai, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/306488.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    postawa ciała
    prędkość
    sztywność
    staw kolanowy
    posture
    pulse wave velocity
    vascular stiffness
    knee flexion angle
    Opis:
    Arterial stiffness measurements are primarily used for the early detection of arteriosclerosis. Methods and devices that can easily measure arterial stiffness at home are in demand. We propose a simple method for measuring brachial–ankle pulse wave velocity (baPWV) at home using a reclining chair and investigate the effects of positioning on baPWV measurement. We measured baPWV in 50 healthy men (21–70 years) in seven different measurement positions, including the supine position, sitting, sitting with the knees flexed at 45°, sitting with the knees flexed at 0°, reclining at 37°, reclining at 50°, and standing. BaPWV was significantly lower in the supine position (P < 0.01) than in the other positions. It was significantly higher in the sitting position (P < 0.01) than in the reclining position (37°). No changes in baPWV were seen changing the knee flexion angle alone while sitting. Strong correlations were also observed between baPWV in the supine position and that in other positions. We showed that baPWV in the supine position can be calculated by making corrections to baPWV measured in the sitting position at a reclining angle. Utilizing this corrected value would allow easy measurement at home using a reclining chair.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2015, 17, 1; 111-116
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A method of precise pulse onset determination using the Akaike Information Criterion for Ultrasound Transmission Tomography
    Autorzy:
    Pruchnicki, Piotr
    Opieliński, Krzysztof J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2146650.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    Akaike Information Criterion
    AIC
    pulse wave
    transmission method
    ultrasound tomography
    kryterium informacyjne Akaike
    fala tętna
    metoda transmisyjna
    tomografia ultradźwiękowa
    Opis:
    Information criteria used in statistics for model selection can be used to accurately determine pulse transition times in transmission methods. The most popular information criteria are the Akaike Information Criterion (AIC) and the Bayesian Schwartz Criterion (BIC). These criteria are considered the most reliable tests of model type and structure and are computationally simple. In this paper, an algorithm developed according to the AIC criterion is used to determine the transition time from transmission tomography measurements acquired with a multi-element ultrasonic ring array, which is the scanning element of the novel prototype of ultrasound tomography device for detecting and estimating the malignancy of female breast cancer in vivo. As a result, a new algorithm was developed to precise search for the onset of the recorded receiving pulse. The algorithm was tested in an aqueous environment using elementary pairs of transmitting and receiving ultrasonic transducers of a tomographic ring array.
    Źródło:
    Vibrations in Physical Systems; 2021, 32, 1; art. no. 2021115
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Artifical Discontinuities in Rocks on the Propagation of Ultrasonic P-Waves
    Autorzy:
    Kamaci, Z.
    Akgüneş, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1029977.pdf
    Data publikacji:
    2018-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    ultrasonic pulse velocity
    joint number
    the wave attenuation
    Opis:
    In this work, experiments were conducted on rectangular prismatic samples with dimensions of 60×60×360 mm^{3}, which were cut from the rock blocks with no joint or anisotropy. Rock samples were obtained from different quarries in Turkey, known by the rock type as Afyon Çay marble, Burdur red limestone, Afyon gray, Lymra limestone, Muğla dolomite, Denizli travertine, and Isparta andesite. Experimental results indicated an increase in seismic wave attenuation as the number of artificial joints increased. However, seismic wave attenuation rate was found to be higher on the samples with parallel joint pattern than the samples which consisted of various directional joint pattern. This feature has explained the importance of seismic velocity anisotropy in rocks. The relationship between the number of joints in seven different rock samples and ultrasonic P-wave velocity was examined statistically and the results were evaluated together with similar studies in the literature.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 5; 1144-1149
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Identification of Trace 2-Chloropropene with a New Chirped Pulse Microwave Spectrometer
    Autorzy:
    Kisiel, Z.
    Kosarzewski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1033441.pdf
    Data publikacji:
    2017-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    chirped pulse
    Fourier transform microwave
    supersonic expansion
    millimetre wave
    rotational spectroscopy
    Opis:
    The design of a new chirped pulse, Fourier-transform microwave spectrometer for recording broadband rotational spectra of supersonic expansion samples is described. The spectrometer can record spectral windows of width of up to 2.2 GHz over the 2-18 GHz frequency region. It is complemented by a new FFT program with several novel features. Tests of the spectrometer revealed the presence of an initially unknown volatile trace molecule in a sample of 2,2-dichloropropane (DCP). The broadband nature of the new spectrometer allowed rapid assignment of the new species as 2-chloropropene, CH₃CCl=CH₂ (2CP). Additional mm wave measurements combined with analysis of previous DCP spectra up to 311 GHz allow us to report the hitherto most precise spectroscopic constants for 2CP.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 2; 311-317
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Examination of the Explosion Strike Factors of a Thermobaric Warhead
    Badanie czynników rażenia wybuchu głowicy termobarycznej
    Autorzy:
    Długołęcki, A.
    Faryński, A.
    Klemba, T.
    Słonkiewicz, Ł.
    Ziółkowski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/403963.pdf
    Data publikacji:
    2017
    Wydawca:
    Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
    Tematy:
    mechanics
    thermobaric explosion
    shock wave
    shock wave velocity
    pressure pulse
    mechanika
    wybuch termobaryczny
    fala uderzeniowa
    prędkość fali uderzeniowej
    impuls ciśnienia
    Opis:
    This paper presents the measurement method and results applicable to the pressure pulses and thermal effects generated by an explosion of an unguided thermobaric rocket missile warhead. The determination results include the shock wave pressure and velocity, the TNT equivalents of the thermobaric warheads, and the personnel strike radii of the shock wave. An estimation of the temperature increase rates at the shock wave front was also undertaken.
    W artykule przedstawiono metodę i wyniki pomiarów impulsów ciśnienia i efektów termicznych generowanych przez wybuch głowicy termobarycznej rakiety niekierowanej. Wyznaczono ciśnienia i prędkości fal uderzeniowych, równoważniki trotylowe detonowanych głowic oraz promienie rażenia siły żywej przez falę uderzeniową, oszacowano przyrosty temperatury na froncie fali uderzeniowej.
    Źródło:
    Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa; 2017, 8, 1 (27); 39-54
    2081-5891
    Pojawia się w:
    Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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