http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Lihui Fu (검색결과 2 건)
- 무료
- 기관 내 무료
- 유료
-
Impact of Various Charge States of Hydrogen on Passivation of Dislocation in Silicon
Lihui Song,Jingjing Lou,Jiayi Fu,Zhenguo Ji 대한금속·재료학회 2018 ELECTRONIC MATERIALS LETTERS Vol.14 No.5
Dislocation, one of typical crystallographic defects in silicon, is detrimental to the minority carrier lifetime of silicon wafer. Hydrogen passivation is able to reduce the recombination activity of dislocation, however, the passivation efficacy is stronglydependent on the experimental conditions. In this paper, a model based on the theory of hydrogen charge state control isproposed to explain the passivation efficacy of dislocation correlated to the peak temperature of thermal annealing and illuminationintensity. Experimental results support the prediction of the model that a mix of positively charged hydrogen andnegatively charged hydrogen at certain ratio can maximise the passivation efficacy of dislocation, leading to a better powerconversion efficiency of silicon solar cell with dislocation in it.
-
Bearing fault diagnosis based on amplitude and phase map of Hermitian wavelet transform
Hui Li,Lihui Fu,Haiqi Zheng 대한기계학회 2011 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.25 No.11
The rolling element bearing characteristic frequencies contain very little energy and are usually overwhelmed by noise and higher level of structural vibrations. The continuous wavelet transform enables one to look at the evolution in the time scale joint representation plane. This makes it very suitable for the detection of singularity generated by localized defects in a mechanical system. However, most applications of the continuous wavelet transform have widely focused on the use of the Morlet wavelet transform. The complex Hermitian wavelet is constructed based on the first and the second derivatives of the Gaussian function to detect signal singularities. The Fourier spectrum of Hermitian wavelet is real, which the Fourier spectrum has no complex phase and the Hermitian wavelet does not affect the phase of a signal in complex domain. This gives the desirable ability to detect the singularity characteristic of a signal precisely. In this study, the Hermitian wavelet amplitude and phase map are used in conjunction to detect and diagnose the bearing fault. The Hermitian wavelet amplitude and phase map are found to show distinctive signatures in the presence of bearing inner race or outer race damage. The simulative and experimental results show that the Hermitian wavelet amplitude and phase map can extract the transients from strong noise signals and can effectively diagnose bearing faults.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
