• 제목/요약/키워드: Physics

검색결과 14,454건 처리시간 0.039초

Soft X-ray spectroscopy of optical field-ionized plasmas

  • Mocek, T.;Cha, Y.H.;Hong, K.H.;Kim, C.M.;Shin, H.J.;Lee, D.G.;Nam, C.H.
    • 한국광학회:학술대회논문집
    • /
    • 한국광학회 1999년도 제16회 광학 및 양자전자 학술발표회Proceedings of 16th Optics and Quantum Electronics Conference, 1999
    • /
    • pp.168-169
    • /
    • 1999
  • PDF

Remote O2 plasma functionalization for integration of uniform high-k dielectrics on large area synthesized few-layer MoSe2

  • Jeong, Jaehun;Choi, Yoon Ho;Park, Dambi;Cho, Leo;Lim, Dong-Hyeok;An, Youngseo;Yi, Sum-Gyun;Kim, Hyoungsub;Yoo, Kyung-Hwa;Cho, Mann?Ho
    • 한국진공학회:학술대회논문집
    • /
    • 한국진공학회 2016년도 제50회 동계 정기학술대회 초록집
    • /
    • pp.281.1-281.1
    • /
    • 2016
  • Transition metal dichalcogenides (TMDCs) are promising layered structure materials for next-generation nano electronic devices. Many investigation on the FET device using TMDCs channel material have been performed with some integrated approach. To use TMDCs for channel material of top-gate thin film transistor(TFT), the study on high-k dielectrics on TMDCs is necessary. However, uniform growth of atomic-layer-deposited high-k dielectric film on TMDCs is difficult, owing to the lack of dangling bonds and functional groups on TMDC's basal plane. We demonstrate the effect of remote oxygen plasma pretreatment of large area synthesized few-layer MoSe2 on the growth behavior of Al2O3, which were formed by atomic layer deposition (ALD) using tri-methylaluminum (TMA) metal precursors with water oxidant. We investigated uniformity of Al2O3 by Atomic force microscopy (AFM) and Scanning electron microscopy (SEM). Raman features of MoSe2 with remote plasma pretreatment time were obtained to confirm physical plasma damage. In addition, X-ray photoelectron spectroscopy (XPS) was measured to investigate the reaction between MoSe2 and oxygen atom after the remote O2 plasma pretreatment. Finally, we have uniform Al2O3 thin film on the MoSe2 by remote O2 plasma pretreatment before ALD. This study can provide interfacial engineering process to decrease the leakage current and to improve mobility of top-gate TFT much higher.

  • PDF

의미 분석법에 의한 공과대학 신입생의 물리 이미지 및 관심 여부 (Physics Image Analysis by Sematic Method and Interest in Physics of Freshman Students in the Engineering College)

  • 송영욱
    • 과학교육연구지
    • /
    • 제44권2호
    • /
    • pp.214-224
    • /
    • 2020
  • 물리 이미지 및 관심은 물리 학습에 영향을 미치는 요인 중에 하나이다. 공과대학 신입생은 고등학교 때에 다양한 학습 환경 조건에서 대학에 입학한다. 대학 물리교육을 위하여 공과대학 신입생의 특성에 따른 물리 이미지 및 관심을 조사할 필요가 있다. 이 연구는 공과대학 신입생의 성별과 고등학교 때 물리 이수 여부에 따른 물리 이미지와 관심 여부를 조사하여, 공과대학 학생의 대학 물리 학습에 대한 교육적 시사점을 논의한다. 연구 대상은 공과대학 1학년 공과 계열 286명, 정보기술 계열 242명, 건설환경 계열 136명 총 664명이다. 분석 내용은 공과대학 신입생의 성별과 고등학교 때 물리 이수 여부에 따른 물리 이미지 및 관심 여부를 분석한다. 분석결과 첫째, 물리 이미지는 공과대학 신입생의 물리 이수 여부에 따라 유의미한 차이가 나타났다. 고등학교 때 물리를 배우지 않은 학생의 물리 이미지 점수가 물리I 또는 물리I,II를 배운 학생보다 높게 나타났다. 둘째, 물리 관심 여부는 성별과 물리 이수 여부에 따라 유의미한 차이가 나타났다. 성별에서는 남학생이 여학생보다 물리 관심이 높았고 고등학교 때 물리 이수 여부에서는 고등학교 때 물리를 이수하지 않은 학생이 물리를 이수한 학생보다 물리 관심이 높았다. 끝으로 공과대학 학생의 대학 물리 학습에 대한 교육적 시사점을 논의한다.

Active control of amplitude and phase of high-power RF systems in EAST ICRF heating experiments

  • Guanghui Zhu;Lunan Liu;Yuzhou Mao;Xinjun Zhang;Yaoyao Guo;Lin Ai;Runhao Jiang;Chengming Qin;Wei Zhang;Hua Yang;Shuai Yuan;Lei Wang;Songqing Ju;Yongsheng Wang;Xuan Sun;Zhida Yang;Jinxin Wang;Yan Cheng;Hang Li;Jingting Luo
    • Nuclear Engineering and Technology
    • /
    • 제55권2호
    • /
    • pp.595-602
    • /
    • 2023
  • The EAST ICRF system operating space has been extended in power and phase control with a low-level RF system for the new double-strap antenna. Then the multi-step power and periodic phase scanning experiment were conducted in L-mode plasma, respectively. In the power scanning experiment, the stored energy, radiation power, plasma impedance and the antenna's temperature all have positive responses during the short ramp-ups of PL;ICRF. The core ion temperature increased from 1 keV to 1.5 keV and the core heating area expanded from |Z| ≤ 5 cm to |Z| ≤ 10 cm during the injection of ICRF waves. In the phasing scanning experiment, in addition to the same conclusions as the previous relatively phasing scanning experiment, the superposition effect of the fluctuation of stored energy, radiation power and neutron yield caused by phasing change with dual antenna, resulting in the amplitude and phase shift, was also observed. The active control of RF output facilitates the precise control of plasma profiles and greatly benefits future experimental exploration.

In-Situ Observation of New Extra-Vascular Threadlike Structure of Mouse Using a Fluorescence Stereoscopic Microscope

  • Sung, Baeck-Kyoung;Lee, Ja-Woong;Lee, Byung-Cheon;Johng, Hyun-Min;Baik, Ku-Youn;Nam, Tae-Jeong;Park, Dae-Hun;Soh, Kyeong-Sun;Soh, Kwang-Sup
    • 대한약침학회지
    • /
    • 제7권3호
    • /
    • pp.73-76
    • /
    • 2004
  • We report the new threadlike structures outside the blood vessels of mice. For this, we developed an in-situ searching method of the structure by vital staining with the dye of acridine orange and using a fluorescent stereomicroscope designed specifically for this purpose. We consider that the newly found threadlike structure might be rediscovery of the extra-vascular Bonghan duct which was reported in 1963 by Bonghan Kim.

Interface between the Electroplated Copper-cobalt Thin Films and the Substrate

  • Kim, Jin-Gyu;Lee, Jung-ju;Bae, Jong-hak;Bang, Won-bae;Hong, Kim-in;Yoon, C. H.;Son, Derac;Jeong, Kee-ju
    • Journal of Magnetics
    • /
    • 제11권3호
    • /
    • pp.119-122
    • /
    • 2006
  • We electroplated copper-cobalt thin films on a silicon substrate, which had 150 nm thick copper seed layer. The adhesion between the two metallic layers could be increased by utilizing a proper organic additive, pulse plating technique, and high temperature annealing. The thin films exhibited columnar growth of the deposits and enhanced adhesion. This is attributed to the grain growth mechanism introduced by the additive and annealing.