http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Adaptive Quasi-PRD Control Method of Grid - Connected PV Inverter Under Weak Grid
Xiaojiao Cao,Guihua Liu,Weinan Xu,Wei Wang 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
The high grid impedance in weak grid will lead to small bandwidth of control system and poor control performance of PV inverter. To solve this problem, this paper presents a quasi-PRD control method which can increase the bandwidth and dynamic response speed of control system. At first, the quasi-PRD controller was applied to replace the traditional PI controller. Then, the two harmonic injection method was used to detect grid impedance online which would be used to adjust the controller parameters adaptively. At last, some simulation and experiments were done to verify the validity of the novel control method.
Xiaojiao Sima,Bo Jiang,Jia Fang,Yongqin He,Zhongxiang Fang,Saravana Kumar KM,Wei Ren,Lingling Qiu,Xiaomin Chen,Bingsong Zheng 한국식물생명공학회 2015 Plant biotechnology reports Vol.9 No.3
MicroRNAs (miRNAs) play a vital role in plant development and growth through negative regulation of post-transcriptional gene expression. Carya cathayensis (hickory) is an important species for dried nuts and oil in China, with high nutritional and economic value. The graft technique is an important strategy for hickory cultivation. To understand the role of miRNAs involved in the hickory graft process, we constructed three small ribonucleic acid (RNA) libraries from hickory rootstock (2 years old) and scion (1 year old) at 0, 7, and 14 days post-graft. Sequence analysis of the three libraries identified 21 conserved miRNAs belonging to 13 families, and 10 novel and 8 potentially novel miRNAs belonging to 15 families. Among these miRNAs, 12 miRNAs were differentially expressed during the graft process in hickory and twothirds were downregulated. Quantitative real-time polymerase chain reaction validated that 14 miRNAs and their expression trends were similar to the results obtained by Solexa sequencing. Further, a total of 89 target genes for conserved and 26 target genes for novel miRNAs were predicted. This study will help in understanding the roles and regulatory modes of miRNAs involvement in the hickory graft process.
Low Cost Fabrication of UV Photodetector Based on Hexagonal Nanocrystal ZnO:Al/p-Si Heterojunction
Li Duan,Feng Wei,Jibin Fan,Xiaochen Yu,Wenxue Zhang,Yan Zhang,Fengni He,Xiaojiao Cheng,Ye Tian 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2016 NANO Vol.11 No.2
ZnO:Al/p-Si heterojunction was fabricated by depositing a hexagonal nanocrystal ZnO:Al film on p-type Si substrate using a simple chemical bath deposition (CBD) method. The vertically aligned hexagonal ZnO:Al nanocrystals reduce the grain boundary scattering and provide good conductivity. The ZnO:Al/Si heterojunction shows obvious photocurrent under ultraviolet (UV) illumination. A high UV-to-visible rejection ratio of the ZnO:Al/Si heterojunction indicates that the hexagonal nanocrystal ZnO:Al film is a good material for fabricating UV photodetectors. Furthermore, the response speed of the photodetector based on ZnO:Al hexagonal nanocrystal film is faster than that of most previously reported photodetectors based on ZnO:Al nanorods. We infer it is because the ZnO:Al nanocrystals film has a smaller surface to volume ratio than the ZnO:Al nanorod array.
Morphology-controllable 3D flower-like TiO2 for UV shielding application
Yawen Wanga,Zunli Mo,Chun Zhang,Ping Zhang,Ruibin Guo,Hao Gou,Rere Hu,Xiaojiao Wei 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.32 No.-
Calliandra like rutile TiO2 hierarchical microspheres with different diameters were successfully preparedby hydrothermal method via altering reaction time. All these as synthesized unique hierarchicalmicrospheres displayed higher UV shielding capability compared with commercial P25 and anataseTiO2. Noticeably, the UV shielding efficiency of these microspheres had a close relation to their diametersand packing density of constituted nanorods. The S-24h-C sample exhibited the highest UV shieldingefficiency, which could not only block all UV light below 400 nm but also show poor photocatalyticactivity under UV light radiation, indicating its great applied potential in UV-blocking materials.