Conventionally, high dynamic-range （HDR） imaging is based on taking two or more pictures of the same scene with different exposure. However, due to a high-speed relative motion between the camera and the scene, it i...Conventionally, high dynamic-range （HDR） imaging is based on taking two or more pictures of the same scene with different exposure. However, due to a high-speed relative motion between the camera and the scene, it is hard for this technique to be applied to push-broom remote sensing cameras. For the sake of HDR imaging in push-broom remote sensing applications, the present paper proposes an innovative method which can generate HDR images without redundant image sensors or optical components. Specifically, this paper adopts an area array CMOS （complementary metal oxide semiconductor） with the digital domain time-delay-integration （DTDI） technology for imaging, instead of adopting more than one row of image sensors, thereby taking more than one picture with different exposure. And then a new HDR image by fusing two original images with a simple algorithm can be achieved. By conducting the experiment, the dynamic range （DR） of the image increases by 26.02dB. The proposed method is proved to be effective and has potential in other imaging applications where there is a relative motion between the cameras and scenes.展开更多
To the Editor:Cesarean section(CS)resolves dystocia and serious pregnancy-related complications but also has adverse outcomes such as long recovery time,uterine rupture,and dangerous placenta previa in future pregnanc...To the Editor:Cesarean section(CS)resolves dystocia and serious pregnancy-related complications but also has adverse outcomes such as long recovery time,uterine rupture,and dangerous placenta previa in future pregnancies.The increase in cesarean section rates(CsRs)worldwide has drawn the attention of international scholars.展开更多
Diaporthe helianthi is one of the main fungal pathogens responsible for causing phomopsis stem canker and significant yield losses of sunflowers.In this study,the calmodulin(Cal)gene of D.helianthi was selected to dev...Diaporthe helianthi is one of the main fungal pathogens responsible for causing phomopsis stem canker and significant yield losses of sunflowers.In this study,the calmodulin(Cal)gene of D.helianthi was selected to develop a rapid detection method involving recombinase polymerase amplification(RPA)combined with CRISPR/Cas12a-based detection at 37℃.The developed detection system could complete the specific detection of D.helianthi in 45 min,including 25 min for RPA and 20 min for CRISPR/Cas12 reaction.The detection system could be coupled with both lateral flow test strips and fluorescence signal reading modes.The detection limit for lateral flow assay was 1 pg/μL genomic D.helianthi DNA(14 copies/μL);The detection limit for fluorescence signal was 0.1 pg/μL genomic DNA(1.4 copies/μL),approximately 100 times higher than that of the real-time PCR.Thus,the developed RPA/CRISPR-Cas12a system meets the need for portable detection of D.helianthi on-site at ports and in the field.展开更多
基金The completion of this paper owns a great deal to the associate editor and anonymous reviewers for their valuable suggestions. The first author is grateful to Xiangzhi Fu for her language help, Guangxing Ding and Dongdong Zeng for their advice. All the authors of this paper express their gratitude to CIOMP for its experiment and site support. And all of us gratefully acknowledge the supports provided for this research by Jilin Natural Science Foundation of China （Grant No. 201505200059JH）.
文摘Conventionally, high dynamic-range （HDR） imaging is based on taking two or more pictures of the same scene with different exposure. However, due to a high-speed relative motion between the camera and the scene, it is hard for this technique to be applied to push-broom remote sensing cameras. For the sake of HDR imaging in push-broom remote sensing applications, the present paper proposes an innovative method which can generate HDR images without redundant image sensors or optical components. Specifically, this paper adopts an area array CMOS （complementary metal oxide semiconductor） with the digital domain time-delay-integration （DTDI） technology for imaging, instead of adopting more than one row of image sensors, thereby taking more than one picture with different exposure. And then a new HDR image by fusing two original images with a simple algorithm can be achieved. By conducting the experiment, the dynamic range （DR） of the image increases by 26.02dB. The proposed method is proved to be effective and has potential in other imaging applications where there is a relative motion between the cameras and scenes.
基金supported by grants from the Capital's Funds for Health Improvement and Research(No.2020-2-2113)Beijing Obstetrics and Gynecology Hospital Capital MedicalUniversity(No.FCYY201801).
文摘To the Editor:Cesarean section(CS)resolves dystocia and serious pregnancy-related complications but also has adverse outcomes such as long recovery time,uterine rupture,and dangerous placenta previa in future pregnancies.The increase in cesarean section rates(CsRs)worldwide has drawn the attention of international scholars.
基金supported by the National Key Research and Development Program of China(2021YFC2600400&2021YFC2600402)Basic Scientific Research Foundation of Chinese Academy of Inspection and Quarantine(2022JK20)the Subject Construction Project of Dalian University(DLUXK-2022-ZD-002).
文摘Diaporthe helianthi is one of the main fungal pathogens responsible for causing phomopsis stem canker and significant yield losses of sunflowers.In this study,the calmodulin(Cal)gene of D.helianthi was selected to develop a rapid detection method involving recombinase polymerase amplification(RPA)combined with CRISPR/Cas12a-based detection at 37℃.The developed detection system could complete the specific detection of D.helianthi in 45 min,including 25 min for RPA and 20 min for CRISPR/Cas12 reaction.The detection system could be coupled with both lateral flow test strips and fluorescence signal reading modes.The detection limit for lateral flow assay was 1 pg/μL genomic D.helianthi DNA(14 copies/μL);The detection limit for fluorescence signal was 0.1 pg/μL genomic DNA(1.4 copies/μL),approximately 100 times higher than that of the real-time PCR.Thus,the developed RPA/CRISPR-Cas12a system meets the need for portable detection of D.helianthi on-site at ports and in the field.
