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Sea fog detection based on unsupervised domain adaptation 被引量:6
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作者 mengqiu xu Ming WU +3 位作者 Jun GUO Chuang ZHANG Yubo WANG Zhanyu MA 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2022年第4期415-425,共11页
Sea fog detection with remote sensing images is a challenging task. Driven by the different image characteristics between fog and other types of clouds, such as textures and colors, it can be achieved by using image p... Sea fog detection with remote sensing images is a challenging task. Driven by the different image characteristics between fog and other types of clouds, such as textures and colors, it can be achieved by using image processing methods. Currently, most of the available methods are datadriven and relying on manual annotations. However, because few meteorological observations and buoys over the sea can be realized, obtaining visibility information to help the annotations is difficult. Considering the feasibility of obtaining abundant visible information over the land and the similarity between land fog and sea fog, we propose an unsupervised domain adaptation method to bridge the abundant labeled land fog data and the unlabeled sea fog data to realize the sea fog detection. We used a seeded region growing module to obtain pixel-level masks from roughlabels generated by the unsupervised domain adaptation model. Experimental results demonstrate that our proposed method achieves an accuracy of sea fog recognition up to 99.17%, which is nearly 3% higher than those vanilla methods. 展开更多
关键词 Deep learning Sea fog detection Seeded region growing Transfer learning Unsupervised domain adaptation
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原位电化学钾离子插层促进层间限域的硝酸盐还原制氨反应 被引量:2
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作者 徐梦秋 章烨 +8 位作者 周海桥 李笑宇 周钰虎 徐旭东 贾淦 祝根平 毋芳芳 高鹏 叶伟 《Science China Materials》 SCIE EI CAS CSCD 2023年第4期1352-1361,共10页
将硝酸根离子电化学转化回有价值的氨(NH_(3))是传统Haber Bosch工艺的一种可能的替代方案.然而,硝酸根电还原制氨目前仍然受制于从NO_(3)^(-)到NH_(3)的低催化活性和低法拉第效率(FE).本文中,我们报告了二维层状结构中的层间限域的硝... 将硝酸根离子电化学转化回有价值的氨(NH_(3))是传统Haber Bosch工艺的一种可能的替代方案.然而,硝酸根电还原制氨目前仍然受制于从NO_(3)^(-)到NH_(3)的低催化活性和低法拉第效率(FE).本文中,我们报告了二维层状结构中的层间限域的硝酸盐还原制氨反应(NTRR).结果表明,原位电化学钾离子(K^(+))插层扩大了层间距,从而触发了层间限域的NTRR.所制备的α-Ni_(0.902)Cu_(0.098)(OH)_(2)超薄纳米片具有高的NTRR性能,在-0.6 V(相对于可逆氢电极)下的NH_(3)产率和FE分别达到了13.4 mol g_(cat).^(-1)h^(-1)和98.9%,远超过已报道的铜基电催化剂.此外,该催化剂还表现出良好的循环稳定性,连续循环20次后活性和FE没有明显的衰减.此外,我们利用原位电化学拉曼光谱结果揭示了从NO_(3)^(-)到NH_(3)的途径. 展开更多
关键词 拉曼光谱 电还原 硝酸根 电催化剂 连续循环 制氨 氢电极 替代方案
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Direct Electron Transfer from Upconversion Graphene Quantum Dots to TiO_(2) Enabling Infrared Light-Driven Overall Water Splitting 被引量:2
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作者 Dongmei Jia Xiaoyu Li +12 位作者 Qianqian Chi Jingxiang Low Ping Deng Wenbo Wu Yikang Wang Kaili Zhu Wenhao Li mengqiu xu xudong xu Gan Jia Wei Ye Peng Gao Yujie Xiong 《Research》 EI CAS CSCD 2022年第3期333-341,共9页
Utilization of infrared light in photocatalytic water splitting is highly important yet challenging given its large proportion in sunlight.Although upconversion material may photogenerate electrons with sufficient ene... Utilization of infrared light in photocatalytic water splitting is highly important yet challenging given its large proportion in sunlight.Although upconversion material may photogenerate electrons with sufficient energy,the electron transfer between upconversion material and semiconductor is inefficient limiting overall photocatalytic performance.In this work,a TiO_(2)/graphene quantum dot(GQD)hybrid system has been designed with intimate interface,which enables highly efficient transfer of photogenerated electrons from GQDs to TiO_(2).The designed hybrid material with high photogenerated electron density displays photocatalytic activity under infrared light(20 mW cm^(-2))for overall water splitting(H_(2):60.4μmol g_(cat).^(-1)h^(-1)and O_(2):30.0μmol g_(cat).^(-1)h^(-1)).With infrared light well harnessed,the system offers a solar-to-hydrogen(STH)efficiency of 0.80%in full solar spectrum.This work provides new insight into harnessing charge transfer between upconversion materials and semiconductor photocatalysts and opens a new avenue for designing photocatalysts toward working under infrared light. 展开更多
关键词 spectrum. SPLITTING system
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An engineered xCas12i with high activity,high specificity,and broad PAM range 被引量:2
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作者 Hainan Zhang Xiangfeng Kong +20 位作者 Mingxing xue Jing Hu Zikang Wang Yinghui Wei Haoqiang Wang Jingxing Zhou Weihong Zhang mengqiu xu Xiaowen Shen Fengcai Yin Zhiyuan Ai Guangyan Huang Junhui Xia xueqiong Song Hengbin Li Yuan Yuan Jinhui Li Na Zhong Meiling Zhang Yingsi Zhou Hui Yang 《Protein & Cell》 SCIE CSCD 2023年第7期540-545,共6页
Dear Editor,The clustered regularly interspaced short palindromic repeats-Cas(CRISPR-Cas)systems,including type II Cas9 and type V Cas12 systems,which serve in the adaptive immunity of prokaryotes against viruses,have... Dear Editor,The clustered regularly interspaced short palindromic repeats-Cas(CRISPR-Cas)systems,including type II Cas9 and type V Cas12 systems,which serve in the adaptive immunity of prokaryotes against viruses,have been developed into genome-editing tools(Anzalone et al.,2020;Doudna,2020).Compared with type II systems,the type V systems including V-A to V-K showed more functional diversity(Yan et al.,2019).Amongst them,Cas12i has a relatively smaller size(1,033-1,093 aa),compared to SpCas9 and Cas12a,and has a 5'-TTN protospacer adjacent motif(PAM)preference(Yan et al.,2019). 展开更多
关键词 HIGH SPECIFICITY
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