Hydrogen energy plays an important role in achieving carbon neutralization,and plasma induced hydrogen is an effective production method.One challenge is how to guarantee high efficiency operation with wide power outp...Hydrogen energy plays an important role in achieving carbon neutralization,and plasma induced hydrogen is an effective production method.One challenge is how to guarantee high efficiency operation with wide power output range of the RF inverter system used to generate the plasma.In this paper,a multi-module parallel topology of a high-frequency inverter is analyzed,in which the power combining network can maintain the soft switching characteristics of the inverter modules.A control method of"ON/OFF+phase shift"is adopted to broaden the output power range of the inverter.The equivalent impedances of different modules are analyzed in detail.A four-module 13.56 MHz high-frequency inverter prototype is built and tested.The results show that the inverter can operate at high efficiency and wide output power range with efficiency improved by at least 5%compared with the traditional parameter design method without considering the effect of paralleled modules.展开更多
We propose a video image mosaic method based on multi-module cooperation. This method stitches the video into a panorama with a large field of view, divided into three modules: the key frame selection module, the imag...We propose a video image mosaic method based on multi-module cooperation. This method stitches the video into a panorama with a large field of view, divided into three modules: the key frame selection module, the image mosaic module, and the optimization module. The key frame selection module obtains key frames by comprehensively evaluating the overlap rate and image quality. The image mosaic module stitches the key frames into a panoramic image to generate an initial mosaic result. The optimization module makes the mosaic result more natural and eliminates ghosts by using object detection advantages. Our method is tested on videos taken in real scenes, and the results have a more comprehensive and natural description.展开更多
In 2019 a Scientific Research&Demonstration Platform was deployed near islands and reefs in South China Sea by a joint research group of 7 institutes and universities in China.It is a simplified small model of a t...In 2019 a Scientific Research&Demonstration Platform was deployed near islands and reefs in South China Sea by a joint research group of 7 institutes and universities in China.It is a simplified small model of a two-module semi-submersible-type VLFS.The test on site has continued for more than one and half years since then for long-term observations to validate the developed key technologies for design and behavior predictions of floating structures deployed near islands and reefs.An integrated information system was set up to continuously collect and inspect the data of the encountered waves,structure responses,connector forces,mooring line forces,anti-corrosion status of the platform,the performance efficiencies of a floating breakwater nearby and a wave energy converter attached on the breakwater.In this paper,the status of the on-site measurements and validations of the key technologies are briefly described.展开更多
基金funded by National Natural Science Foundation of China under grant 52007041.
文摘Hydrogen energy plays an important role in achieving carbon neutralization,and plasma induced hydrogen is an effective production method.One challenge is how to guarantee high efficiency operation with wide power output range of the RF inverter system used to generate the plasma.In this paper,a multi-module parallel topology of a high-frequency inverter is analyzed,in which the power combining network can maintain the soft switching characteristics of the inverter modules.A control method of"ON/OFF+phase shift"is adopted to broaden the output power range of the inverter.The equivalent impedances of different modules are analyzed in detail.A four-module 13.56 MHz high-frequency inverter prototype is built and tested.The results show that the inverter can operate at high efficiency and wide output power range with efficiency improved by at least 5%compared with the traditional parameter design method without considering the effect of paralleled modules.
基金supported by the National Natural Science Foundation of China (Nos.61906135, 62020106004 and 92048301)the Tianjin Science and Technology Plan Project (No.20JCQNJC01350)。
文摘We propose a video image mosaic method based on multi-module cooperation. This method stitches the video into a panorama with a large field of view, divided into three modules: the key frame selection module, the image mosaic module, and the optimization module. The key frame selection module obtains key frames by comprehensively evaluating the overlap rate and image quality. The image mosaic module stitches the key frames into a panoramic image to generate an initial mosaic result. The optimization module makes the mosaic result more natural and eliminates ghosts by using object detection advantages. Our method is tested on videos taken in real scenes, and the results have a more comprehensive and natural description.
基金supported by the Ministry of Industry and Information Technology(Grant No.[2016]22)the Ministry of Science and Technology(Grant No.2013CB36100)+2 种基金supports of the High-tech Ships Research Program([2016]22 and[2019]357)of the Ministry of Industry and Information Technologythe State Key Fundamental Research Program(2013CB036100)and the National Key Research and Development Program(No.2017YFBO202701)of the Ministry of Scienceand Technologythe Jiangsu Province Science Foundation for Youths(BK20190151).
文摘In 2019 a Scientific Research&Demonstration Platform was deployed near islands and reefs in South China Sea by a joint research group of 7 institutes and universities in China.It is a simplified small model of a two-module semi-submersible-type VLFS.The test on site has continued for more than one and half years since then for long-term observations to validate the developed key technologies for design and behavior predictions of floating structures deployed near islands and reefs.An integrated information system was set up to continuously collect and inspect the data of the encountered waves,structure responses,connector forces,mooring line forces,anti-corrosion status of the platform,the performance efficiencies of a floating breakwater nearby and a wave energy converter attached on the breakwater.In this paper,the status of the on-site measurements and validations of the key technologies are briefly described.
