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
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
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
基金supported in part by the Ministry of Education-China Mobile Communication Corp(MoE-CMCC)Artificial Intelligence Project,China(No.MCM20190701)。
文摘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.
基金financially supported by the National Natural Science Foundation of China(51902077 and 22005268)Zhejiang Provincial Natural Science Foundation(LQ19B010001)+2 种基金Zhejiang Province"Ten Thousand People Plan"Innovation and Entrepreneurship Project of High-Level Overseas Students in Hangzhou in 2021the Research StartUp Fund of Hangzhou Normal University(4095C5021920466)。
基金the Natural Science Foundation of China(51902077 and 21725102)Zhejiang Provincial Natural Science Foundation(LY18E020010 and LQ19B010001)+3 种基金Zhejiang Province“Ten Thousand People Plan”(2018R52015)Pandeng Plan Foundation of Hangzhou Normal University for Youth Scholars of Materials,Chemistry and Chemical Engineering,Agricultural and Social Development Program Project(2020ZDSJ0712)of Hangzhou ScienceTechnology Bureau of Zhejiang Province,general items of Zhejiang Provincial Department of Education(Y201840068)Visiting Scholar Development Project of Department of Education of Zhejiang Provincial(FX2019043).
文摘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.
文摘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).