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    Wyświetlanie 1-7 z 7
    Tytuł:
    Pulsed Power Technology for Pollution Control
    Autorzy:
    Namihira, T.
    Wang, D.
    Akiyama, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1807850.pdf
    Data publikacji:
    2009-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    52.80.Wq
    52.80.Hc
    Opis:
    Recently, the pulsed power technology led us to generate discharge plasma in high-pressure gas, liquid and solid environment. The discharge plasmas have a lot of functions such as an intense electric field, a large current flow, a chemically active radical formation, a shockwave generation, and an ultraviolet irradiation. Using the functions, the pollution control technologies, including exhaust gases treatment, ozone generation, water treatment, and material destruction or separation, were developed in laboratory. In the paper, the NO removal by ns pulsed discharge plasma and the aggregate recycling by the discharge inside of concrete would be introduced.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 6; 953-955
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New possibility for the use of plasma discharges to identify amber and changes in amber structure
    Autorzy:
    Gnapowski, S.
    Lenik, K.
    Szwed, G.
    Akiyama, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/103303.pdf
    Data publikacji:
    2012
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    amber
    pulsed power plasma discharge
    shock wave
    cracks
    silicone oil
    red color amber
    Opis:
    Pulsed power discharge applied in air to the amber surface was found to cause improvement in its appearance and color changes such as to red, a color not natural to amber but attractive for jewelry. Needle and plate electrodes were used during experiments. Pulsed power discharges in air particularly turned amber red at the edges and around the needle electrode. Discharges in water did not change amber structure because discharge occurring on the surface does not cross the amber structure. Discharges in silicone oil had a different effect, with most discharge passing through the amber structure, causing fine cracks. Unfortunately, the absence of a consistent amber structure causes difficulty in selecting the correct discharge (shock wave) power. Using new technology, we have changed the appearance a very old material-amber (about 40 – 60 million years old) – to make it more attractive for customers; this technology is also useful for detecting artificial amber (costume jewellery) without causing damage to the product.
    Źródło:
    Advances in Science and Technology. Research Journal; 2012, 6, 16; 1-6
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Performances of Nanosecond Pulsed Discharge
    Autorzy:
    Matsumoto, T.
    Wang, D.
    Namihira, T.
    Katsuki, S.
    Akiyama, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1807933.pdf
    Data publikacji:
    2009-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    52.80.Hc
    Opis:
    The conventional methods such as selective catalytic reduction method, electron beam method and lime-gypsum method could not treat exhaust gases completely. In addition, the energy efficiency and the cost of the conventional ways are still unfavourable. In recent years, the pollution control techniques using electric discharge plasmas which attract attention as the low cost and high energy efficient exhaust gas treatment methods, have been widely studied. In our laboratory, pulsed streamer discharge plasmas which are one of the non-thermal plasmas have been used to treat exhaust gases. Since a pulse width of applied voltage has a strong influence on the energy efficiency of the removal of pollutants, the development of a short pulse generator is of paramount importance for practical applications. In this work, nanosecond pulse generator which can output the 5 ns pulsed voltage is developed. In addition, the exhaust gas treatment and the ozone production by nanosecond pulse generator were demonstrated.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 6; 1101-1103
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Polarity and Rise Time of Applied Pulsed Voltage on Streamer Discharge Phenomena
    Autorzy:
    Yoshinaga, K.
    Okada, S.
    Wang, D.
    Namihira, T.
    Katsuki, S.
    Akiyama, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1807907.pdf
    Data publikacji:
    2009-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    52.80.Hc
    Opis:
    Pulsed streamer discharges have been extensively used in many applications such as control of $NO_X$ and $SO_2$ from exhaust gases, treatment of dioxins, removal of volatile organic compounds, generation of ozone and laser excitation. An operation with a high-energy efficiency is necessary for practical applications. It is very important to know the propagation mechanism of streamer discharges in order to improve the energy efficiency of pulsed discharge systems. In this paper, the emission from pulsed streamer discharges in a coaxial electrode system in air at 0.1 MPa was observed using a high-speed gated intensified charge-coupled display camera. A concentric wire-cylinder electrodes configuration was used. Positive and negative pulsed voltages having a width of about 200 ns were applied to the central electrode. From the results, the streamer discharges were initiated at the inner electrode and terminated at the outer electrode. It is suggested that the propagation velocity of the streamer discharges is being influenced strongly by the rise time and the polarity of the pulsed voltage.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 6; 1050-1052
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nitric Oxide Generator Based on Pulsed Arc Discharge
    Autorzy:
    Sakai, S.
    Matsuda, M.
    Wang, D.
    Namihira, T.
    Akiyama, H.
    Okamoto, K.
    Toda, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1807934.pdf
    Data publikacji:
    2009-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    52.80.Mg
    Opis:
    Nitric oxide (NO) is increasingly being used in medical applications. Currently, a gas cylinder of $N_{2}$ mixed with a high concentration of NO is used in the NO inhalation system. However, this arrangement is potentially risky due to the possibility of accidental leak of NO from the cylinder. The presence of NO in air leads to the formation of nitric dioxide $(NO_{2})$, which is toxic to the lungs. Therefore, an on-site generation of NO would be very desirable for patients with acute respiratory distress syndrome and other related illnesses. Previously, our group reported the production of NO using a pulsed arc discharge. In this work, the prototype of the on-site NO generator was developed and the performances of the NO generator were demonstrated for medical applications.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 6; 1104-1106
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Activation of Retrotransposon in Red Alga by Underwater Pulsed Discharge
    Autorzy:
    Hirayama, K.
    Wang, D.
    Matsuda, M.
    Lin, X.
    Namihira, T.
    Takano, H.
    Takio, S.
    Akiyama, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1807936.pdf
    Data publikacji:
    2009-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    52.80.Wq
    Opis:
    Retrotransposons are mobile genetic elements that accomplish transposition via an RNA intermediate. These elements can be transcriptionally activated by stress factors, such as UV light, ozone, pathogens, wounding and drought. A red alga, Porphyra yezoensis has recently been recognized as a model plant for fundamental and applied study in marine biological science. In this paper, pulsed streamer-like discharge in liquid was used as a new stress condition, and the transcriptional levels of retrotransposon and functional genes of a red alga, Porphyra yezoensis was investigated. From the results of reverse transcription-polymerase chain reaction (RT-PCR) experiments, it is clear that the transcriptions of retrotransposon and functional genes were activated by applying pulsed streamer-like discharge.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 6; 1110-1111
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Coarse Aggregate Recycling by Pulsed Discharge Inside of Concrete
    Autorzy:
    Inoue, S.
    Araki, J.
    Aoki, T.
    Maeda, S.
    Iizasa, S.
    Takaki, M.
    Wang, D.
    Namihira, T.
    Shigeishi, M.
    Ohtsu, M.
    Akiyama, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1807935.pdf
    Data publikacji:
    2009-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    52.80.Wq
    Opis:
    In Japan, the treatment of waste concrete scraps has been one of the environmental issues. Therefore, new application using pulsed power discharge has been developed as the recycling method of the coarse aggregates from the waste concrete scraps. In the work, the dependences of the quality of the recycled coarse aggregate by the repetitive pulsed discharge treatments on the consumption energy were investigated. As the results, it was clear that the quality of the recycled coarse aggregate could be controlled by the number of discharge treatments. The recycled coarse aggregate, which satisfied class H under the regulations of Japan Industrial Standard (JIS A5005 and JIS A5021), was produced with the smallest consumption energy when the discharged energy from 0.02 μF of capacitor charged up to 400 kV applied to the waste concrete scraps during single discharge treatment.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 6; 1107-1109
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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