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A Reliable Field Emission Performance of Double-Walled Carbon Nanotube Field Emitters
S. I. Jung(정승일),S. B. Lee(이승백) 한국진공학회(ASCT) 2008 Applied Science and Convergence Technology Vol.17 No.6
촉매 화학기상증착법을 이용하여 합성된 이중층 탄소나노튜브를 가지고 전계전자 방출원을 제작하여 이들의 신뢰성 있는 전계전자 방출특성을 조사하였다. 합성된 탄소 필라멘트들은 TEM, TGA, 그리고 Raman 분석을 통하여 결함이 없고 순도가 높은 이중층 탄소나노튜브가 합성이 되었음을 확인하였다. 이들 이중층 탄소나노튜브 전계전자 방출원은 이전극 구조에서 낮은 턴-온 전계와 높은 전류밀도의 전계전자 방출 특성을 보여주었고, 균질한 전계방출 패턴과 좋은 전계방출 안정성을 나타내었다. We investigated the field emission characteristics from the planar field emitters made of double-walled carbon nanotubes (DWCNTs) synthesized by a catalytic chemical vapor deposition (CCVD) method. Transmission electron microscopy, Thermogravimetric and Raman analysis showed that the carbon materials have a low defect level in their atomic carbon structure, pointing to the synthesis of high-purity DWCNTs. For field emission properties of DWCNTs, the turn-on field of DWCNTs was 1.9 V/㎛ and the current density was about 74 ㎃/㎠ at 8.1 V/㎛, which is sufficient for the applications of field emission displays and vacuum microelectronic devices. The DWCNT field emitters also exhibited a uniform field emission pattern and good field emission stability in a diode configuration.
이승관 ( S K Lee ),이창규 ( C K Lee ),류정록 ( J R Ryu ),검석수 ( S Su Kim ),김상섭 ( S S Kim ),김창영 ( J Y Kim ),장철수 ( Chou I Soo Chang ) 대한임상검사과학회 1993 대한임상검사과학회지(KJCLS) Vol.25 No.1
Calcium exists in serum in three forms, as the free ion and as complexes with proteins and with smaller molecules; of these, the ionized species is the one that in physiologically active. For this reason some investigators tried to find the most convenient method for estimating calcium IOns. In this study, we compared three measurements (Zeisler, Mario and Hanna method) for inoized calcium to our Nova 7 method. Patient comparison results for ISE(x) compared to the other three methods. (y) are : Zeisler=0.579x+0.944, r=0.394, n=50;Mario =0.435x+l.469, r=0.216, n=50;Hanna=O. 905x+0.749, r=0.479, n=50. In conclusion, all performance characteristics of the nomogram method evaluated in this study were found to be incompatible to the Nova 7 method for serum ionized calcium analySIS.
S. I. Jung(정승일),S. K. Choi(최상규),S. B. Lee(이승백) 한국진공학회(ASCT) 2008 Applied Science and Convergence Technology Vol.17 No.4
최적화된 량의 황화수소 첨가 가스를 이용하여 실리콘 기판위에 증착된 Fe/Al 박막위에 촉매 화학 기상 증착법을 사용하여 직경이 얇은 다중층 탄소나노튜브가 수직 정렬되어 합성되었다. 주사전자현미경 관측 이미지에서 합성된 탄소나노튜브는 상대적으로 일정한 길이를 가지고 기판에 수직으로 정렬되었다. 투과전자현미경 관측에서 합성된 탄소나노튜브는 10㎚ 이내의 작은 외경을 가졌고 촉매가 거의 없었다. 평균 튜브의 벽 수는 약 다섯 개이다. 수직 정렬된 직경이 얇은 다중층 탄소나노튜브의 성장 메카니즘이 제시되었다. 수직 정렬된 직경이 얇은 다중층 탄소나노튜브는 0.1 ㎂/㎠의 전류밀도에서 약 1.1 V/㎛ 낮은 턴-옹 전계를 나타내었고 2.7 V/㎛의 전계에서 약 2.5 ㎃/㎠의 전류밀도를 얻었다. 게다가, 수직 정렬된 직경이 얇은 다중층 탄소나노튜브는 약 1 ㎃/㎠의 전류밀도에서 20시간동안 전류밀도 저하 없이 좋은 전계 방출 안정성을 보여주었다. We have succeeded in synthesizing vertically aligned thin multi-walled carbon nanotubes (VA thin-MWCNTs) by a catalytic chemical vapor deposition (CCVD) method onto Fe/Al thin film deposited on a Si wafers using an optimum amount of hydrogen sulfide (H₂S) additive. Scanning electron microscope (SEM) images revealed that the as-synthesized CNT arrays were vertically well-oriented perpendicular to the substrate with relatively uniform length. Transmission electron microscope (TEM) observations indicated that the as-grown CNTs were nearly catalyst-free thin-MWCNTs with small outer diameters of less than 10㎚. The average wall number is about 5. We suggested a possible growth mechanism of the VA thin-MWCNT arrays. The VA thin-MWCNTs showed a low tum-on electric field of about 1.1 V/㎛ at a current density of 0.1 ㎂/㎠ and a high emission current density about 2.5 ㎃/㎠ at a bias field of 2.7 V/㎛. Moreover, the VA thin-MWCNTs presented better field emission stability without degradation over 20 hours (h) at the emission current density of about 1 ㎃/㎠.
이승일(S. I. Lee),기호철(H. C. Ki),김보성(B. S. Kim),송문석(B. S. Kim) 한국도시철도학회 2014 한국도시철도학회논문집 Vol.2 No.1
Driving on the track of a railway vehicle running noise and peripheral devices can be distinguished by the behavior of the noise, and speed 200 km/h below the railway vehicle"s main source of noise driving the friction that occurs between wheel and rail is the noise. In this study, the friction of railway vehicle in order to measure the noise sound using the acoustic camera to track the position of driving the generation of noise sources, and that the cause was investigated. As a result, an increase in speed up, were found to increase the friction noise. In addition, the noise source and the acoustic camera was able to measure its size.