• 제목/요약/키워드: High Xe

검색결과 141건 처리시간 0.032초

집광된 태양열을 반응기에서의 메탄 수증기개질 연구 (Steam Reforming of Methane in a Solar Concentrated Receiver Reactor)

  • 김기만;남우석;한귀영;서태범;강용혁
    • 한국신재생에너지학회:학술대회논문집
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    • 한국신재생에너지학회 2006년도 추계학술대회
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    • pp.172-175
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    • 2006
  • Steam reforming of methane using Xe-arc solar simulator was studied for converting solar radiation into energy foam that one can readily utilize. The Xe-arc lamp produce a spectrum similar to that of the sun. SiC ceramic foam, resist high temp.$(>900^{\circ}C)$, is used to catalytically active foam absorber, and to support of reforming catalyst. The catalyst on the surface of foam were directly irradiated with solar simulated xe-light in order to carry out the steam reforming of methane. The reactor was made of stainless steel and quartz window was located on a place of the xe-light irradiation and temperature was controlled using K-type thermocouple in contact with catalyst located inside the reactor. The result show that a possibility of solar reforming using catalytically active foam absorber is exist.

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The Effect of MgO Rate Preparing Conditions and Xe Partial Pressure on the Relative Life time of an AC Plasma Display Panel

  • Park, Cha-Soo;Park, Min-Seok;Park, Joon-Young;Kim, Dong-Hyun;Lee, Ho-Jun;Park, Chung-Hoo
    • KIEE International Transactions on Electrophysics and Applications
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    • 제3C권2호
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    • pp.35-42
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    • 2003
  • This paper proposes a relative lifetime test method of MgO thin film. The suggested test conditions are 5$0^{\circ}C$, 400Torr, 20% over-voltage and 300KHz. The relative lifetime of MgO thin film is significantly affected by the MgO preparing conditions and Xe partial pressure. As result, the lifetime of the AC plasma display panel (PDP) is increased with an MgO thickness of 2000$\AA$ to 8000$\AA$ but is saturated over 5000$\AA$ (up to 9000 $\AA$). In addition, as Xe partial pressure increases, AC PDP lifetime increases.

New Electrode Shape for High Xe-content Gas in AC PDP

  • Park, Cha-Soo;Choi, Joon-Young;Kim, Goon-Ho;Kim, Joong-Kyun;Kim, Dong-Hyun;Lee, Ho-Jun;Park, Chung-Hoo
    • Journal of Information Display
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    • 제4권4호
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    • pp.13-18
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    • 2003
  • One of the most important issues in AC PDP is the improvement of luminous efficiency. One possible method for achieving this aim is by increasing Xe partial pressure in discharge gas mixture. The increase of Xe ratio, however, causes the driving voltage to rise, even if brightness is increased. In this study, a new electrode shape is proposed. A test panel fabricated by using a new electrode shows that efficacy has improved by 25 % and sustain voltage has decreased by 20 % compared with the conventional structure.

The effects of high Xe contents on the improvement of luminous efficacy of AC PDP with Segmented electrode in Delta color arrayed Rectangular subpixels(SDR)

  • Kim, Tae-Jun;Jeong, Dong-Cheol;Chung, Woo-Joon;Whang, Ki-Woong
    • 한국정보디스플레이학회:학술대회논문집
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    • 한국정보디스플레이학회 2002년도 International Meeting on Information Display
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    • pp.79-82
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    • 2002
  • In this paper, we investigate the characteristics of luminous efficacy as a function of Xe partial pressure in AC PDP. SDR structure has shown much larger increment of luminous efficacy compared with the conventional one especially below 10% Xe contents. The luminous efficacy around 4.0 lm/W is achieved with Ne-Xe10%, 400Torr in Monochrome green phosphor test panel under 10kHz continuous sustaining frequency.

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Mechanism of High Luminous Efficiency in Delta Color Arrayed, Enclosed Sub-pixel Structured AC PDP with High Xe Content

  • Bae, Hyun-Sook;Kim, Tae-Jun;Whang, Ki-Woong
    • 한국정보디스플레이학회:학술대회논문집
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    • 한국정보디스플레이학회 2004년도 Asia Display / IMID 04
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    • pp.59-62
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    • 2004
  • We investigated the effect of Xe content variation on the luminous efficiency of two different sub-pixel types, i.e., segmented electrode in delta color arrayed enclosed sub-pixel (SDE) and conventional stripe barrier type, in an ac plasma display panel through three-dimensional numerical simulations. The conventional cell type was found to have higher VUV generation efficiency as compared with that of SDE structure, but as the Xe content increased, the SDE type showed higher improvements in efficiency due to the lower plasma loss to the barrier walls.

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The New Electrode Shape for Xe of High Density in AC PDP

  • Kim, Goon-Ho;Lee, Young-Kwon;Choi, Yoon-Chang;Lee, Sang-Jin;Kim, Dong-Hyun;Lee, Ho-Jun;Park, Chung-Hoo
    • 한국정보디스플레이학회:학술대회논문집
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    • 한국정보디스플레이학회 2003년도 International Meeting on Information Display
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    • pp.83-87
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    • 2003
  • One of the most serious problems in AC PDP is low luminous efficiency. One possible candidate for solving such a problem is using high Xe partial pressure. Increase of Xe percentages causes the driving voltage to rise, although brightness is increased. In this study, a new electrode structure is proposed to solve this problem. A test panel fabricated by using new electrode shows improvement of efficiency by 25% and reduction of sustain voltage by 20% compared with the conventional structure.

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Experimental Investigation of the Excited Xe Atoms Density in Ultra-high-resolution PDPs

  • Ishii, Keiji;Hirano, Yoshikuni;Murakami, Yukio
    • 한국정보디스플레이학회:학술대회논문집
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    • 한국정보디스플레이학회 2008년도 International Meeting on Information Display
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    • pp.61-64
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    • 2008
  • We investigated experimentally the influence of the generation efficiency for excited Xe atoms on ultra-fine horizontal cell pitch AC PDPs. In the case of a 0.1 mm cell pitch, the sustain voltage increased; however, the generation efficiency was equal to or higher than for the conventional 0.22 mm cell pitch.

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직관형 형광램프의 종단방전과 횡단방전의 특성 (Properties of Longitudinal & Transverse Discharge in a Tubular Fluorescent Lamp)

  • 정재윤;김정현;정종문;김동준;김현철;봉재환;황하청;마이클리;구제환;조광섭
    • 한국진공학회지
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    • 제17권4호
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    • pp.322-330
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    • 2008
  • 유리관의 관경이 4 mm인 형광램프에서 종단방전과 횡단방전의 방전 특성, 발광 특성, 그리고 분광 특성을 상호 비교 분석하였다. 제작된 형광램프의 주입 기체는 3 종류이며, 수은 혼합 기체인 Ne(95%)+Ar(5%)+Hg(2 mg), 무수은의 순수 Xe 100% 및 Ne(96%)+Xe(4%)의 혼합 기체이다. 각 형광램프 샘플들의 기체 압력은 8 종으로 압력 범위는 $5{\sim}300\;Torr$이다. 상기 램프의 특성을 조사하기 위하여 제작된 샘플 램프의 전체 수는 주입 기체 3 가지와 각 압력 8 가지로서 총 24 개이다. 수은 형광램프는 양광주 발광을 특징으로 하는 종단방전에서 발광 휘도 및 효율이 매우 높고, 횡단방전에서는 거의 발광하지 않는다. 무수은 제논 형광램프는 횡단방전에서 비교적 높은 휘도 특성을 보이며, 종단 방전에서는 방전 전압이 높고 발광 효율도 매우 낮다. 제논 형광램프의 횡단방전은 Ne+Xe(4%)인 혼합 가스보다 압력($\sim$수 100 Torr)이 높은 순수 제논 가스의 발광 효율이 더 높다. 본 실험을 통하여 수은 램프와 무수은 제논 램프의 방전 방식의 차이를 확인하였다. 수은 형광램프는 양광주를 활용하는 종단방전의 형태로서 종래의 튜브형이 바람직하다. 무수은의 제논 형광램프는 높은 압력($\sim$수 100 Torr)의 순수 제논 기체에 대하여 방전 경로가 짧은 횡단방전을 특징으로 하는 평판형이 바람직하다.

라오스볼라벤고원의어류상과 Poropuntius bolovenensis의 섭식기구다형성 (Fish Fauna in the Bolaven Plateau and Trophic Polymorphism of Poropuntius bolovenensis in Laos)

  • 강동원;;이학영;최승호
    • 한국환경생태학회지
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    • 제30권3호
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    • pp.369-375
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    • 2016
  • 2014년 3월부터 4월까지 라오스 볼라벤 고원의 Xe Pian과 Xe Namnoy의 본류 및 지류 하천에서 어류상을 조사한 결과 총 8과 28종의 어류가 확인되었다. 채집된 어류 중 Devario salmonatus, Poropuntius bolovenensis, Annamia sp., Sewellia elongata, Schistura bolavenensis, Schistura sp.1, Schistura sp.2, Schistura sp.3, Schistura sp.4, Macronathus sp. 등 10종은 볼라벤 고원의 고유종으로 본 지역은 35.7%의 높은 고유화 빈도를 나타냈다. 한편 볼라벤 고원 내에 4종의 Poropuntius속 어류가 서식한다고 알려져 있으나(Kottelat, 2000, 2013) 본 조사에서 입 모양을 제외한 주요 계수형질이 4종 모두 중복되는 것을 확인하였다. 또한 미성어(>70mm)는 일반적인 입 모양(narrow)을 가졌으나, 성어의 입 모양은 2가지 유형(narrow/broad)으로 나타나 성장하면서 입 모양이 변화하는 것으로 생각된다. 본 연구를 통해 볼라벤 고원에 서식하는 Poropuntius속 어류는 Poropuntius bolovenensis 1종이며, 본 종은 다양한 입 모양을 가지는 섭식기구의 다형성(Trophic polymorphism)이 존재하는 것을 확인하였다.

The influence of Ne-Xe gas mixture ratio on vacuum Ultraviolet and infrared line in AC-PDP

  • Oh, Phil-Y.;Cho, I.R.;Jung, Y.;Park, K.D.;Ahn, J.C.;Choi, E.H.
    • 한국정보디스플레이학회:학술대회논문집
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    • 한국정보디스플레이학회 2003년도 International Meeting on Information Display
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    • pp.743-747
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    • 2003
  • The improvement of luminance and luminous efficiency is the one of the most important part in AC-PDPs. To achieve high luminance and luminous efficiency, high VUV emission efficiency is needed. We measured the emission spectra of vacuum ultraviolet(VUV) and infrared(IR) rays in surface discharge AC-PDP with Ne-Xe mixture gas. The influence of Ne-Xe gas-mixture ratio on resonance state $Xe^{\ast}(3P_{1})$ and exited state $Xe^{\ast}(3P_{2})$ has been investigated. It is found that the intensity of VUV 147nm emission is proportional to that of the IR 828 nm emission, and the VUV 173nm emission is roughly proportional to that of the IR 823nm emission. The electron temperature and plasma density have been experimentally measured from the center of sustaining electrode gap by a micro Langmuir probe in AC-PDPs. The plasma density from the center of sustaining electrode gap are shown to be maximum value of $9{\times}10^{11}cm^{-3}$, where the electron temperature is about 1.6 eV in this experiment

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