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 : Xu Linbo (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
-
A Fiber Spool’s Vibration Sensitivity Optimization Based on Orthogonal Experimental Design
Jing Gao,Linbo Zhang,Dongdong Jiao,Guanjun Xu,Xue Deng,Qi Zang,Honglei Yang,Ruifang Dong,Tao Liu,Shougang Zhang 한국광학회 2024 Current Optics and Photonics Vol.8 No.1
A fiber spool with ultra-low vibration sensitivity has been demonstrated for the ultra-narrowlinewidth fiber-stabilized laser by the multi-object orthogonal experimental design method, which can achieve the optimization object and analysis of influence levels without extensive computation. According to a test of 4 levels and 4 factors, an L 16 (4 4 ) orthogonal table is established to design orthogonal experiments. The vibration sensitivities along the axial and radial directions and the normalized sums of the vibration sensitivities are determined as single objects and comprehensive objects, respectively. We adopt the range analysis of object values to obtain the influence levels of the four design parameters on the single objects and the comprehensive object. The optimal parameter combinations are determined by both methods of comprehensive balance and evaluation. Based on the corresponding fractional frequency stability of ultra-narrow-linewidth fiber-stabilized lasers, we obtain the final optimal parameter combination A3B1C2D1, which can achieve the fiber spool with vibration sensitivities of 10 −12 /g magnitude. This work is the first time to use an orthogonal experimental design method to optimize the vibration sensitivities of fiber spools, providing an approach to design the fiber spool with ultra-low vibration sensitivity.
-
Qing Li,Yong-jie Shi,Guohua Xu,Linbo Wu 한국항공우주학회 2023 International Journal of Aeronautical and Space Sc Vol.24 No.2
In order to numerically simulate the brownout phenomenon encountered by helicopters in a sandy environment, a new coupled method is established that takes into account the accuracy and efficiency of calculation. In this method, the computational fluid dynamics (CFD) method based on the unsteady momentum source model and the discrete-element method (DEM) based on discrete dynamics are coupled to deal with this two-phase flow problem. In order to verify the validity of the calculation method, the results were compared with available real aircraft brownout flight test results, the results of the RANS method based on overset grids, and the results of the viscous vortex particle method (VVPM). Then, by applying the established method, a numerical simulation of the brownout phenomenon of a typical helicopter approach maneuver was carried out. The results show that after maneuvering descent changes into near-ground forward flight, the sand cloud that is generated is widely distributed and has a lower concentration near the fuselage, and the overall particle saltation characteristics are similar to those at higher forward flight speeds. This means that the phenomenon of brownout is reduced for a certain period of time in the approach chosen in this paper.
-
Comparison of Acyrthosiphon pisum probing behaviors on different alfalfa cultivars
Yu Liangbin,Cui Jin,Wang Danyang,Zhang Quanyi,Xu Linbo 한국응용곤충학회 2023 Journal of Asia-Pacific Entomology Vol.26 No.1
Acyrthosiphon pisum (Harris) is a major pest of alfalfa worldwide. Here, we evaluated the resistance of eight alfalfa cultivars to A. pisum to identify resistant cultivars. The Giga-8 DC-EPG technique was used to record differences in electrical waveform patterns of probing behavior to identify cultivars with higher resistance. The frequency and average duration of EPG waveforms significantly differed among the cultivars, with eight docu mented waveforms (np, C, pd, E1, E2, sE2, F, and G). The longer duration of np, C, F and E1 waveforms reflected stronger resistance, whereas longer sE2 waveforms reflected weaker resistance. The resistance-related wave forms, np and C, occurred most frequently with Sardi 7, the time of the first E waveforms were the latest, duration of G waveforms and F waveforms were the longest, the feeding waveforms E2 and sE2 were the shortest, the time of reaching phloem for feeding was the latest, with notable resistance in leaf epidermis, mesophyll and phloem. The number of C waveforms occurring with Gibraltar were the least, duration of np waveforms was short, feeding waveforms were long, time to reach the phloem for feeding was early, and the resistance was not pronounced in various tissues. After comprehensive evaluation, the resistance levels of 8 alfalfa cultivars were as follows: High resistance, Sardi 7; Resistance, Zhongcao No. 3, Derby, WL319HQ; Low resistance, Golden Empress, Algonquin, Zhaodong; Susceptible, Gibraltar. In conclusion, evaluation of cultivar resistance to aphids can provide baseline data for selecting and planting cultivars with high local resistance
DBpia
ScienceON연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
