http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Investigation of the transition between glow and streamer discharges in atmospheric air
Choi, Jai Hyuk,Lee, Tae Il,Han, Inho,Baik, Hong Koo,Song, Kie Moon,Lim, Yong Sik,Lee, Eung Suok IOP Pub ; American Institute of Physics 2006 Plasma sources science & technology Vol.15 No.3
<P>Generally, the parameter <I>p</I> · <I>d</I> (pressure × gap distance) in dielectric barrier discharge (DBD) controls the electrical breakdown and also the plasma characteristics. We investigated the optimum plasma transition <I>p</I> · <I>d</I> by controlling the pressure. To find the transition <I>p</I> · <I>d</I> (<I>p</I> · <I>d</I><SUB>tr</SUB>) condition, optical emission spectroscopy (OES) was used to measure emission spectra from the DBD. All <I>p</I> · <I>d</I> data were normalized by the second positive system of nitrogen molecules, the wavelength of which was 337.1 nm. Then we compared the relative intensities of species generated during the discharge by OES analysis. Species selected for comparison were the first negative system (FNS) of nitrogen molecules (391.4 nm) and atomic oxygen spectra (777.1 nm). Experimental results showed that relative intensities were almost constant as <I>p</I> · <I>d</I> decreased, but at specific <I>p</I> · <I>d</I> data, the intensity started to increase. The increase in FNS of nitrogen molecules means not only an increase in electron energy but also a change in the plasma mode, streamer to glow transition. In the case of DBD using alumina with 1 mm thickness applied ac power, the plasma transition occurred at the 1 Torr cm condition.</P>
Analysis of polymer surface treated by dielectric barrier discharge
Choi, Jai Hyuk,Lee, Eung Suok,Baik, Hong Koo,Lee, Se-Jong,Song, Kie Moon,Lim, Yong Sik IOP Pub ; American Institute of Physics 2005 Plasma sources science & technology Vol.14 No.2
<P>We investigate polymer surfaces after exposing them to dielectric barrier discharges with different flowing gases (He, CF<SUB>4</SUB>) in air. The relationship between the gas characteristics and the surface properties of polypropylene (PP) is determined by contact angle measurement, optical emission spectroscopy and x-ray photoelectron spectroscopy. Experimental results reveal that there is a definite relationship between the surface energy and the surface chemical composition of PP and also indicate that the hydrophilicity of PP in an atmospheric pressure (AP) discharge is more dependent on ionic bombardment than on the atomic oxygen composition at the surface and its hydrophobicity depends on the fluorine composition at the PP surface. In addition, it turns out that in a CF<SUB>4</SUB> discharge at AP, the CF<SUB>3</SUB> molecular band exhibits a continuum band at the orange line in the visible range.</P>