• 제목/요약/키워드: Trap( + )

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전력케이블용 가교폴리에틸렌의 공간전하 극성측정기술에 관한 연구 (A Study on the Space Charge Polarity Measurement Teasurement Technology of Cross-Linked Polyethylene for Power Cable)

  • 국상훈;서장수;김병인;박중순
    • 한국조명전기설비학회지:조명전기설비
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    • 제6권6호
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    • pp.23-31
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    • 1992
  • Charged particle in the polymers is supposed to affect the electrical conduction and to lead them th dielectrical breakdown finally. So we measured the space charge distribution made by application of high electric field and evaluated the polarity of the charged particle affected on electrical conduction and space charge formed in the insulating materials by using temperature gradient thermally stimulated current measurement method(TG-TSC measurement). As a result, in the cross-linked polyethylene, A-peak was caused from dipole polarization, C-peak was caused from ionic space charge polarization and D-peak was injected trap hole. Also we found it crossible the evaluated the polarity of injected trap carrier and electron(or hole) of carrier trap in the cross-lined polyethylene. We found that ${\gamma}$-ray irradiated low density polyethylene had a relation to the electronic trap and we also could get the value of electric field distribution in the samples of which evaluation was available.

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금속후 어닐링 방법이 Si-$SiO_2$ 계면 전하 농도에 미치는 영향 (Effect of Post-Metallization Anneal (PMA) on Interface Trap Density of Si-$SiO_2$)

  • 정종완
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2007년도 추계학술대회 논문집
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    • pp.157-158
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    • 2007
  • Effects of post-metallization anneal (PMA) on interface trap characteristics of Si-$SiO_2$ are studied. The conventional PMA method utilizes forming gas anneal, where 10% hydrogen in nitrogen atmosphere is used. A new PMA method utilizes hydrogen rich PECVD- silicon nitride $(SiN_x)$ film as a hydrogen diffusion source and a out-diffusion blocking layer. It can be shown through charge pumping current measurement that the new PMA is indeed effective to decrease Si-$SiO_2$ interface trap density.

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Sediment Deponsits and Trap Efficiencies of Irrigation Reservoirs

  • Park, Seung-W.;Kim, Jin-T.
    • Korean Journal of Hydrosciences
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    • 제5권
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    • pp.71-83
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    • 1994
  • The objectives of the paper are to apply the gross erosion and sediment delivery ratio method for estimating sediment deposits and to define their trap efficiencies. For twenty irrigation reservoirs which have sediment survey data, the gross erosion was estimated from the channel erosion as well as the soil losses by applying USLE. The gross erowion was reduced to the sediment yields by multiplying the sediment delivery ratios. The results were multipled by trap efficiencies after Brune method to estimate sediment deposits, which were compared to sediment surveyed data. The comparisons showed deposits. And a trap efficiency relationship was derived from a regression method, which appeared better suited for irrigation reservoirs.

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Effect of Orius laevigatus and Neoseiulus cucumeris on Suppression of Thrips Density on Paprika in Greenhouse in Summer

  • Lim, Y.S.;Lee, M.J.;Shin, Y.S.;Han, Y.Y.
    • 한국유기농업학회지
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    • 제19권spc호
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    • pp.214-217
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    • 2011
  • When paprika is cultivated during summer season, thrips starts to occur in the early growing season and reaches its peak in late June. In the treatment using Orius laevigatus and Neoseiulus cucumeris, natural enemies to thrips, thrips density was 87.6/trap and 51.3/trap on June 23. After Orius laevigatus and Neoseiulus cucumeris were treated twice on June 24 and July 23, the number decreased considerably. On August 23, it was 36.9/trap and 40.3/trap and from the mid August to early September thrips density remained low. Effect of Orius laevigatus and Neoseiulus cucumeris on suppression of thrips density was 35.7% and 44.6% on July 22, however, the number went up to 88.8% and 80.5% on September 3.

A Study on Purge Efficiency in Purge and Trap Analysis of VOCs in Water

  • 이강진;표희수;박송자;유은아;이대운
    • Bulletin of the Korean Chemical Society
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    • 제22권2호
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    • pp.171-178
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    • 2001
  • A Purge and Trap Concentrator has been used to analyze various volatile organic compounds in water, operating several parameters affecting the extraction efficiencies of these compounds. The object of the present study was to observe the purge efficiencies of 40 volatile organic compounds (VOCs) in water, according to the change of parameters (purge time, dry purge time, sample temperature), and to determine the optimum condition of analysis of VOCs. The Purge and Trap Concentrator was interfaced with a narrow capillary connected to a gas chromatography mass spectrometer. At this condition, the detection limits of VOCs were in the range of 0.1-0.5 ㎍/L.

Discharge characterization of two-region arc plasma (TRAP) ion source

  • Kihyun Lee;Seung Ho Jeong;Tae-Seong Kim;Dae-Sik Chang;Sung-Ryul Huh
    • Nuclear Engineering and Technology
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    • 제56권9호
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    • pp.3961-3968
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    • 2024
  • The Korea Atomic Energy Research Institute (KAERI) is developing a novel Two-Region Arc Plasma Ion Source (TRAP) as a negative hydrogen (deuterium) ion source for a Neutral Beam Injection (NBI) system in a fusion tokamak. The TRAP ion source is based on a two-region configuration, comprising a high energy electron region that creates highly vibrationally excited molecules and a low electron temperature region that generates negative ions by attaching electrons to molecules. This configuration can be achieved by optimizing the filament position and magnetic cusp field. In order to optimize the TRAP configuration, the plasma parameters are investigated under various operating conditions, such as filament position, gas pressure, and arc power. Electron density and temperature are determined using Langmuir probe measurements. In this paper, the detailed experimental results are described and discussed.

ZnO계 바리스터의 입계포획준위 (Grain Boundary Trap Levels in ZnO-based Varistor)

  • 김명철;박순자
    • 한국재료학회지
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    • 제2권1호
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    • pp.12-18
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    • 1992
  • 등온용량과도분광법(Isothermal Capacitance Transient spectroscopy)을 이용하여 ZnO 바리스터의 포획준위를 결정하였다. 여기서 등온용량과도분광기는 YHP 4192A 임피던스 Analyzer와 데이터해석을 위한 개인용 컴퓨터로 구성된다. 이 실험에서 우리는 $ZnO-Bi_2O_3$에 MnO 및 CoO를 첨가한계에서 $-40^{\circ}C~60^{\circ}C$ 온도범위에서 0.28, 0.48, 0.50, 0.94eV 등의 입계포획준위가 존재함을 볼 수 있었다. 또한, $ZnO-Bi_2O_3$계는 CoO를 첨가하면 hole에 의한 emission특성을 나타내고, MnO를 첨가하면 전자에 의한 emission특성을 나타냄을 알 수 있었다. 그리고 비 직선저항계수 $\alpha$는 도너농도의 감소에 직접적으로 비례하였으나, 포획준위의 밀도와는 별다른 비례관계를 발견할 수 없었다. 결론적으로 $ZnO-Bi_2O_3-MnO$계에 CoO를 첨가함에 따라 $\alpha$값이 증가하는 한편, 포획준위밀도는 CoO의 첨가로 감소함을 알 수 있었다.

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