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- 저자 : Jigang Han (검색결과 5 건)
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Jigang Han,Jian Li,Xiaoqing Li,Qunlu Liu,Yonghong Hu 한국원예학회 2021 Horticulture, Environment, and Biotechnology Vol.62 No.2
Tree peonies distributed in Baokang County (Hubei Province, China) (BKTPs) displayed extensive morphological variation,especially in fl ower color patterns and fruit setting rates. The genetic diversity of BKTPs and their relationships to nine wildspecies and 14 representative traditional cultivars were assessed using simple sequence repeat (SSR) markers in this study. All 19 analyzed loci were polymorphic, and 85 alleles were found. The number of alleles per locus varied from 3 to 7, withan average of 4.474. Cluster analysis with UPGMA method based on SSR markers partitioned 46 accessions of BKTPs intotwo major clusters and six subgroups, closing to P. ostii , P. qiui , P. rockii , P. jishanensis and diff erent cultivars, respectively. Analysis of fl avonoids with UPLC-Q-TOF-MS/MS revealed that Pn3G5G and Cy3G5G were the main anthocyanins ofthe pink and reddish-purple fl owers of BKTPs, which were undetectable in white fl owers. The fruit and seed setting ratesof BKTPs ranged from 4.00 to 26.00 per plant, and 130.00 to 858.00 per plant, respectively. The content of unsaturatedfatty acids was over 90% of the total fatty acids in the seed oils of BKTPs, with α-linolenic acid as the dominant compound(42.51–54.93%). Both phenotypic and molecular data suggested that the accessions of BKTPs were a hybrid complex resultedfrom introgression between the sympatrically distributed wild species and cultivars in Baokang, which provided novel geneticresources for tree peony breeding and germplasm innovation.
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Fatigue performance monitoring of full-scale PPC beams by using the FBG sensors
Licheng Wang,Jigang Han,Yupu Song 국제구조공학회 2014 Smart Structures and Systems, An International Jou Vol.13 No.6
When subjected to fatigue loading, the main failure mode of partially prestressed concrete (PPC)structure is the fatigue fracture of tensile reinforcement. Therefore, monitoring and evaluation of the steelstresses/strains in the structure are essential issues for structural design and healthy assessment. The currentstudy experimentally investigates the possibility of using fiber Bragg grating (FBG) sensors to measure thesteel strains in PPC beams in the process of fatigue loading. Six full-scale post-tensioned PPC beams wereexposed to fatigue loading. Within the beams, the FBG and resistance strain gauge (RSG) sensors wereindependently bonded onto the surface of tensile reinforcements. A good agreement was found between therecorded results from the two different sensors. Moreover, FBG sensors show relatively good resistance tofatigue loading compared with RSG sensors, indicating that FBG sensors possess the capability forlong-term health monitoring of the tensile reinforcement in PPC structures. Apart from the above findings, itcan also be found that during the fatigue loading, there is stress redistribution between prestressed andnon-prestressed reinforcements, and the residual strain emerges in the non-prestressed reinforcement. Thisphenomenon can bring about an increase of the steel stress in the non-prestressed reinforcement.
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Fatigue performance monitoring of full-scale PPC beams by using the FBG sensors
Wang, Licheng,Han, Jigang,Song, Yupu Techno-Press 2014 Smart Structures and Systems, An International Jou Vol.13 No.6
When subjected to fatigue loading, the main failure mode of partially prestressed concrete (PPC) structure is the fatigue fracture of tensile reinforcement. Therefore, monitoring and evaluation of the steel stresses/strains in the structure are essential issues for structural design and healthy assessment. The current study experimentally investigates the possibility of using fiber Bragg grating (FBG) sensors to measure the steel strains in PPC beams in the process of fatigue loading. Six full-scale post-tensioned PPC beams were exposed to fatigue loading. Within the beams, the FBG and resistance strain gauge (RSG) sensors were independently bonded onto the surface of tensile reinforcements. A good agreement was found between the recorded results from the two different sensors. Moreover, FBG sensors show relatively good resistance to fatigue loading compared with RSG sensors, indicating that FBG sensors possess the capability for long-term health monitoring of the tensile reinforcement in PPC structures. Apart from the above findings, it can also be found that during the fatigue loading, there is stress redistribution between prestressed and non-prestressed reinforcements, and the residual strain emerges in the non-prestressed reinforcement. This phenomenon can bring about an increase of the steel stress in the non-prestressed reinforcement.
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Kim, Hyun-Kyung,Bak, Seong-Min,Lee, Suk Woo,Kim, Myeong-Seong,Park, Byeongho,Lee, Su Chan,Choi, Yeon Jun,Jun, Seong Chan,Han, Joong Tark,Nam, Kyung-Wan,Chung, Kyung Yoon,Wang, Jian,Zhou, Jigang,Yang, Royal Society of Chemistry 2016 ENERGY AND ENVIRONMENTAL SCIENCE Vol.9 No.4
<P>Graphene nanomeshes (GNMs) with nanoscale periodic or quasi-periodic nanoholes have attracted considerable interest because of unique features such as their open energy band gap, enlarged specific surface area, and high optical transmittance. These features are useful for applications in semiconducting devices, photocatalysis, sensors, and energy-related systems. Here, we report on the facile and scalable preparation of multifunctional micron-scale GNMs with high-density of nanoperforations by catalytic carbon gasification. The catalytic carbon gasification process induces selective decomposition on the graphene adjacent to the metal catalyst, thus forming nanoperforations. The pore size, pore density distribution, and neck size of the GNMs can be controlled by adjusting the size and fraction of the metal oxide on graphene. The fabricated GNM electrodes exhibit superior electrochemical properties for supercapacitor (ultracapacitor) applications, including exceptionally high capacitance (253 F g(-1) at 1 A g(-1)) and high rate capability (212 F g(-1) at 100 A g(-1)) with excellent cycle stability (91% of the initial capacitance after 50000 charge/discharge cycles). Further, the edge-enriched structure of GNMs plays an important role in achieving edge-selected and high-level nitrogen doping.</P>
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