• 제목/요약/키워드: C-V characteristic

검색결과 428건 처리시간 0.04초

Two new relationships for slip velocity and characteristic velocity in a non-center rotating column

  • Torkaman, Rezvan;Heydari, Mehran;Cheshmeh, Javad Najafi;Heydari, Ali;Asadollahzadeh, Mehdi
    • Nuclear Engineering and Technology
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    • 제54권8호
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    • pp.2809-2818
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    • 2022
  • In this investigation work, liquid-liquid extraction (L.L.E) through three distinctive frameworks have been examined for assurance of slip velocity (S.V), and characteristic velocity (C.V) in a non-center rotating column (N.C.R.C) with a wide extend of factors. Three double frameworks with distinctive interfacial tension comprising of toluene-water (high interfacial tension), n-butyl acetate-water (medium interfacial tension), and n-butanol-water (low interfacial tension) were investigated for tests. Two common relationships for the expectation of S.V and C.V, including phase stream rates, rotor speed, column geometry additionally physical properties, are displayed. The recommended relationships were compared with test information gotten from the writing and the display examination. Findings of this study, the present proposed correlations are more accurate than those previously reported.

다층박막 거울을 이용한 단색 엑스선 획득 (Acquisition of Monochromatic X-ray Using Multilayer Mirror)

  • 천권수
    • 대한방사선기술학회지:방사선기술과학
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    • 제33권3호
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    • pp.179-184
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    • 2010
  • 나노 공간분해능을 갖는 영상을 얻기 위한 경엑스선 현미경 시스템에서는 단색 엑스선이 요구된다. 엑스선관에서 발생되는 화이트 빔으로부터 8.4 keV의 텅스텐 $L_{\alpha}$ 특성방사선을 84% 이상 반사시킬 수 있는 5.65 nm의 단위막 두께를 가지는 C/W 다층박막 거울을 설계하였고, 이온빔 스파터링 장치를 이용하여 $50{\times}50\;mm$ 크기로 제작하였다. 제작된 C/W 다층박막 거울은 99.5% 이상의 균일도(Uniformity)를 가지며, TEM 사진을 이용해 그 구조를 확인하였다. 8.05 keV의 구리 특성방사선을 광원으로 하는 엑스선 반사율 측정 장치를 이용한 다층박막 거울의 반사율을 측정함으로써 C/W 다층박막 거울의 8.4 keV에서의 반사율을 예상할 수 있었다. 제작된 C/W 다층박막 거울과 엑스선관을 이용하여 8.4 keV의 특성방사선을 획득함으로써 단색 엑스선을 획득하였다. 이때의 반사율은 77.1%였고, 단색 엑스선의 반치폭은 0.21 keV이었다. 엑스선관에서 높은 효율로 단색 엑스선을 획득할 수 있어 실험실 규모의 경엑스선 현미경 장치의 광원으로써 사용될 수 있는 가능성을 확인하였고, 다층박막 거울의 단위막 두께를 수 나노미터로 제작한다면 17.5 keV의 몰리브덴 특성방사선에 해당하는 단색 엑스선을 얻어 유방촬영에도 적용할 수 있을 것이다.

Side gate 길이에 따른 Double gate MOSFET의 C-V 특성 (Side gate length dependent C-V Characteristic for Double gate MOSFET)

  • 김영동;고석웅;정학기;이종인
    • 한국정보통신학회:학술대회논문집
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    • 한국해양정보통신학회 2004년도 춘계종합학술대회
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    • pp.661-663
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    • 2004
  • 본 논문에서는 main gate와 side gate를 갖는 double gate MOSFET의 C-V 특성을 조사하기 위하여 side gate 길이와 side gate 전압을 변화시켜 조사하였다. Main gate 전압은 -5V에서 +5V까지 변화시켰으며, main gate 길이가 50nm, side gate 길이가 70nm, side gate 전압이 3V, drain 전압이 2V일때 우수한 C-V 특성을 얻었다. 이 때 소자의 특성 분석을 위해 ISE-TCAD를 사용하여 시뮬레이션 하였다.

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PBDG의 유전현상에 관한 연구 (A Study on the Dielectric Phenomenon of PBDG)

  • 송진원;이경섭
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2002년도 추계학술대회 논문집 Vol.15
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    • pp.362-365
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    • 2002
  • This paper, experiment manufactures device of Metal/Poly-${\gamma}$ Benzyl $_D$-GlutamateOrganic Films/Metal structure using PBDG and I-V properties and C-F properties. The I-V characteristic is measured that approve voltage from 0 to +2[V] of device and the distance between electrode is larger, could know that small current flow and thin film could know that had insulation property. C-F characteristic has each other affinity between the polarization amount and frequency. Permittivity of MIM device could know by dipole that is voluntary polarization of LB film that polarization is happened. The capacitor properties of a thin film is better as the distance between electrodes is smaller.

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직류 전차선로용 공극형 피뢰기의 특성 분석 (Characteristic Analysis of Gapped Surge Arresters for D.C. Railway Line)

  • 조한구;한세원;윤한수;천종욱
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2001년도 하계학술대회 논문집
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    • pp.485-488
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    • 2001
  • This paper provides the result of analysis of the structure and I-V characteristics of D.C. 1500 V surge arresters which were installed in railway line currently. As Porcelain housed surge arresters have unstable elements such as exploding and dispersion, so it is thought that the system is protected more stably with replacement of polymer housing. The adoption of gap mitigates the voltage stress which is degradation factor of surge arresters and the research is needed to enhance the life characteristic in additive and manufacturing process. Therefore, it is thought that the research should be continued to develop homemade the surge arresters for D.C. railway line as well as transmission line.

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AC Loss를 고려한 22.9kV급 Mini-Model 변압기의 절연 설계 및 시험 (Insulating Design and Test of 22.9kV Class Mini-Model Transformer Considering AC Loss)

  • 백승명;정종만;곽동순;김해종;석복렬;김상현
    • 대한전기학회논문지:전기물성ㆍ응용부문C
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    • 제53권8호
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    • pp.420-424
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    • 2004
  • This paper presents experimental data from model windings with different arrangement of coil in order to provide information to design a 22.9kV class HTS transformer. Before experiment, the composite insulation of two different type of HTS transformers are investigated. The first basic of investigation is a breakdown characteristic of liquid nitrogen and flashover characteristic on the GFRP surface under ac and impulse, The second investigation is insulation design, manufacture and test of model windings. These include a AC withstand voltage test of 50 kV rms and a lighting impulse test of 150 kV at peak.

접촉연소식 센서를 이용한 $CH_4$$C_4$$H_{10}$ 감도 측정 및 전압변화 (The $CH_4$and $C_4$$H_{10}$ Sensitivity Measurement and Voltage Variation Using Catalytic Combustion Type Gas Sensor)

  • 윤헌주;신종열;홍진웅
    • 한국화재소방학회논문지
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    • 제15권3호
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    • pp.44-48
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    • 2001
  • 본 연구에서는, 접촉연소식 가스 탐지 소자를 대상으로 감도특성 및 전기적 특성을 분석하였으며, 24시간 동안 공기중에 노출시킨 후 온도($20^{\circ}c$, $40^{\circ}c$)와 상대습도(65%, 85%)에서 작동시켜 분석하였다. 또한 동일한 주거환경에서 210일 동안 50 cm/sec 유속을 유지하며 가스탐지소자의 동작을 실험하였다. 가스 탐지센서에 공급 전원은 기본회로에 직류 전압별(2.1V, 2.2V, 2.3V)로 인가하였다. 따라서, 상대습도와 온도에 의한 이소부탄과 메탄 특성그래프를 각각 분석한 결과 전반적으로 선형적인 증가를 보임을 확인할 수 있다.

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Pr-첨가 ZnO 바리스터의 전기적 특성 (Electrical Properties of Pr-doped ZnO Varistors)

  • 곽민환;이상기;조성걸
    • 한국세라믹학회지
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    • 제34권12호
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    • pp.1275-1281
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    • 1997
  • ZnO varistors containing 5.0 at% Co3O4 and Pr6O11, ranging from 0.1 to 1.0 at%, were sintered at 130$0^{\circ}C$ and 135$0^{\circ}C$. The I-V characteristics and nonlinear coefficients of the specimens were investigated with respect to Pr addition and sintering temperature. In general the specimens sintered at 130$0^{\circ}C$ showed better varistor characteristic than those fired at 135$0^{\circ}C$, which seemed to be related with the liquid phase formation during sintering. The barrier heights obtained from C-V relations, 0.29-1.36 eV, were different from those acquired using resistivity-temperature plots measured at low voltage per grain boundary. Therefore the estimation of potential barrier heights using C-V relations is better suited for the specimens prepared in this study. The carrier densities obtained using C-V relations were ~1018 cm-3.

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