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| 1 | First light of the 1.8-m solar telescope–CLST显示文摘Large-aperture solar telescopes play an important role in solar observations and research,and require high temporal and spatial resolution[1].To solve some fundamental problems such as the solar dynamo,coronal heating,and the triggering of major solar eruptions,the spatial resolution for solar-atmosphere observation should reach at least 0.1 arcsec[2]. | ChangHui Rao NaiTing Gu XueJun Rao Cheng Li LanQiang Zhang JinLong Huang Lin Kong Ming Zhang YunTao Cheng Yi Pu Hua Bao YouMing Guo YangYi Liu JinSheng Yang LiBo Zhong ChangJun Wang Kai Fang XiaoJun Zhang DongHong Chen Cheng Wang XinLong Fan ZhiWu Yan KeLe Chen XiYa Wei Lei Zhu Hong Liu YongJian Wan Hao Xian WenLi Ma | 2020 | Science China(Physics,Mechanics & Astronomy)2020，63，10： | 6 |
| 2 | Adaptive optics based on machine learning: a review显示文摘Adaptive optics techniques have been developed over the past half century and routinely used in large ground-based telescopes for more than 30 years.Although this technique has already been used in various applications,the basic setup and methods have not changed over the past 40 years.In recent years,with the rapid development of artificial in-telligence,adaptive optics will be boosted dramatically.In this paper,the recent advances on almost all aspects of adapt-ive optics based on machine learning are summarized.The state-of-the-art performance of intelligent adaptive optics are reviewed.The potential advantages and deficiencies of intelligent adaptive optics are also discussed. | Youming Guo Libo Zhong Lei Min Jiaying Wang Yu Wu Kele Chen Kai Wei Changhui Rao | 2022 | Opto-Electronic Advances2022，5，7： | 6 |
| 3 | EAST-Educational Adaptive-optics Solar Telescope显示文摘For the public having a better understanding of solar activities,the Educational Adaptive-optics Solar Telescope(EAST)was built in July 2021 and is located at the Shanghai Astronomy Museum.The EAST consists of a 65 cm aperture solar telescope with a 177-element adaptive optics system and two-channel high resolution imaging system at the Hαand TiO bands,in addition to three full disk solar telescopes at CaK,Hαand TiO bands equipped on the tube of the main telescope.In this paper,the configuration of the EAST is described.Its performance and on-sky observational results are presented.The EAST,to our knowledge,is the most advanced solar telescope for the popularization of science in the world.Due to its excellent performance,the data acquired by the EAST can also be used for research on solar physics and space weather prediction. | Changhui Rao Xuejun Rao Zhimao Du Hua Bao Cheng Li Jinlong Huang Youming Guo Libo Zhong Qing Lin Xin Ge Jinsheng Yang Xinlong Fan Yangyi Liu Dan Jia Xin Li Mei Li Ming Zhang Yuntao Cheng Jiahui Zhou Jiawen Yao Lanqiang Zhang Naiting Gu | 2022 | Research in Astronomy and Astrophysics2022，22，6： | 3 |
| 4 | First light of solar multi-conjugate adaptive optics at the 1-m new vacuum solar telescope显示文摘Observations play a leading role in any branches of astronomy,including solar physics.In order to solve fundamental problems,such as solar dynamo[1],coronal heating[2]and the triggering of major solar eruptions[3],solar observations with spatial resolution better than 0.1 arcsec are required.Such a goal cannot be achieved without the help of adaptive optics(AO),which eliminates the wavefront distortion caused by atmosphere turbulence[4,5].However,solar observations are performed over an extended field of | ChangHui Rao LanQiang Zhang Lin Kong YouMing Guo XueJun Rao Hua Bao Lei Zhu LiBo Zhong | 2018 | Science China(Physics,Mechanics & Astronomy)2018，61，8： | 2 |
| 5 | Adaptive control of piezoelectric fast steering mirror for high precision tracking application显示文摘 | WANG Geng RAO Changhui | 2015 | Smart Materials&Structures2015，24，03： | 1 |
| 6 | Field-of-view Shifted Shack-Hartmann Wavefront Sensor for daytime adaptive optics system 显示文摘 | LI Chaohong XIAN Hao RAO Changhui | 2006 | Optics Letters(S1539-479)2006，31，19： | 1 |
| 7 | Bit-error rate for free-space optical communication with tip-tilt compensation显示文摘 | Changqi Yang Wenhan Jiang Changhui Rao | 2006 | Waves in Random and Complex Media2006，16，3： | 1 |
| 8 | Ground-layer adaptive optics for the New Vacuum Solar Telescope:Instrument description and first results显示文摘Ground-layer adaptive optics(GLAO)has shown its potential for use in solar observation owing to its wide field-of-view(FOV)correction.A high-order GLAO system that consists of a multiple direction Shack-Hartmann wavefront sensor(WFS),a realtime controller with a multi-CPU processor,and a 151-element deformable mirror was developed for the 1-m New Vacuum Solar Telescope at Yunnan Observatories,Chinese Academy of Sciences.A hexagonal microlens with 9×8 subapertures is employed in the WFS.The detection FOV is 42′′×37′′,in which 9(3×3)guide regions are extracted for multiple direction wavefront sensing with a frame rate of up to 2200 Hz.To our knowledge,this is the first professional solar GLAO system used as a regularly operating instrument for scientific observations.Its installation and adjustment were performed in the summer of 2021.In this article,a detailed account of the GLAO system and its first light results and a comprehensive analysis of the performance of the GLAO system are provided.The results show that this system can effectively improve the imaging quality after compensating for the wavefront aberration due to ground-layer turbulence. | Lanqiang Zhang Hua Bao Xuejun Rao Youming Guo Libo Zhong Xian Ran Nanfei Yan Jinsheng Yang Cheng Wang Jiahui Zhou Ying Yang Yunyao Long Xinlong Fan Zhongyi Feng Donghong Chen Changhui Rao | 2023 | Science China(Physics,Mechanics & Astronomy)2023，66，6： | 1 |
| 9 | Tracking algorithms for low-contrast extended objects 显示文摘 | Rao Changhui Jiang Wenhan Ling Ning | 2002 | Chinese Astronomy and Astrophysics2002，26，： | 1 |
| 10 | Waveiront sensorless adaptive optics: a general model-based approach显示文摘 | Huang Linhai Rao Changhui | 2011 | Opt Express2011，19，1： | 1 |
| 11 | Diffraction-limited performance and aberration tolerance of a sparse optical synthetic aperture imaging system with four sub-apertures 显示文摘 | Wang Shengqian Rao Changhui Jiang Wenhan | 2008 | Journal of Mordern Optics2008，55，11： | 1 |
| 12 | Modified Gaussian influence function of deformable mirror aetuators显示文摘 | Huang Linghai Rao Changhui Jiang Wenhan | 2008 | Opt Express2008，16，1： | 1 |
| 13 | High-resolution visible imaging with piezoelectric deformable secondary mirror: experimental results at the 1.8-m adaptive telescope显示文摘Integrating deformable mirrors within the optical train of an adaptive telescope was one of the major innovations in astronomical observation technology,distinguished by its high optical throughput,reduced optical surfaces,and the incorporation of the deformable mirror.Typically,voice-coil actuators are used,which require additional position sensors,internal control electronics,and cooling systems,leading to a very complex structure.Piezoelectric deformable secondary mirror technologies were proposed to overcome these problems.Recently,a high-order piezoelectric deformable secondary mirror has been developed and installed on the 1.8-m telescope at Lijiang Observatory in China to make it an adaptive telescope.The system consists of a 241-actuator piezoelectric deformable secondary mirror,a 192-sub-aperture Shack-Hartmann wavefront sensor,and a multi-core-based real-time controller.The actuator spacing of the PDSM measures 19.3 mm,equivalent to approximately 12.6 cm when mapped onto the primary mirror,significantly less than the voicecoil-based adaptive telescopes such as LBT,Magellan and VLT.As a result,stellar images with Strehl ratios above 0.49 in the R band have been obtained.To our knowledge,these are the highest R band images captured by an adaptive telescope with deformable secondary mirrors.Here,we report the system description and on-sky performance of this adaptive telescope. | Youming Guo Kele Chen Jiahui Zhou Zhengdai Li Wenyu Han Xuejun Rao Hua Bao Jinsheng Yang Xinlong Fan Changhui Rao | 2023 | Opto-Electronic Advances2023，6，12： | 1 |
| 14 | Bit-error rate for free-space optical communication with tip-tilt compensation 显示文摘 | YANG Changqi JIANG Wenhan RAO Changhui | 2006 | Waves in Random and Complex Media2006，16，3： | 1 |
| 15 | Measuring statistical error of Shack-Hartmann wavefront sensor with discrete detector arrays 显示文摘 | XIAN L C RAO Hao JIANG Changhui | 2008 | Journal of Modem Optics2008，55，14： | 1 |
| 16 | Error analysis of CCD-based point source centroid computation under the background light显示文摘 | Ma Xiaoyu Rao Changhui Zheng Hanqing | 2009 | Optics Express2009，17，10： | 1 |
| 17 | Error analysis of CCD-based point source centroid computation under the background light显示文摘 | Xiaoyu Ma Changhui Rao Hanqing Zheng | 2009 | Opt Express2009，17，10： | 1 |
| 18 | Experimental Study on Thermal Properties and Light-to-Thermal Conversion Performance of Ionic Liquids Based Nanofluids显示文摘As a new type of energy transport medium with high efficiency and high heat transfer performance,nanofluids have shown broad application prospects in the fields of thermodynamics,solar heat collection,microelectronics,thermal energy,and material science.The wide liquid range and environmental properties of ionic liquids have drawn ample attention to their application when used as a working fluid,especially as a base solvent of nanofluids.The ionic liquid-based nanofluids were prepared by a two-step method using 1-ethyl-3-methylimidazole trifluoroacetate ionic liquid as a base solvent and graphene oxide(GO)as a nanofiller.Thermophysical properties study reveals that the thermal conductivity could be enhanced by 3.0%with the addition of 0.05 wt%GO,and the viscosity and the specific heat capacity were also subject to study as a function of testing temperature and concentration of nanofiller.Additionally,the photothermal conversion efficiency of these nanofluids was studied comprehensively under different conditions.The results show that the photothermal conversion efficiency can reach 83%within an irradiation time of 6000 s and the highest temperature of the nanofluids is up to 105.89℃with a maximum photothermal conversion efficiency increase by 29%. | LIU Changhui SHI Xiancong GAO Ding CAO Yuqi GU Yanlong RAO Zhonghao | 2023 | Journal of Thermal Science2023，32，6： | 0 |
| 19 | Wide spectrum and rapid calculation model for atmospheric radiative transfer in limb remote sensing显示文摘We proposed a wide spectrum and rapid calculation model FALTRAN( Fast Atmospheric Limb TRANsmission),to solve the problems of current radiative transfer model in limb remote sensing. In FALTRAN:( 1) Band model algorithm was employed and the molecular spectroscopy database was based on HITRAN2008.( 2) Limb radiative transfer equation consists of scattering and thermal radiation was established,and according to the limb geometry characteristic,a Hemisphere Radiation Adding( HRA) approach based on finite difference method was proposed to solve it. We investigated the atmospheric limb radiations under typical atmospheric modes in several commonly used remote sensing bands. Moreover,radiation contribution by two hemispheres was quantitative analyzed as well. Validation results show that the relative differences between FALTRAN and Combining Differential-Integral( CDI) model are within 2%,and calculation results by FALTRAN have good agreement with Michelson Interferometer for Passive Atmospheric Sounding( MIPAS) measurements. FALTRAN is proven to be reliable in the limb radiative transfer calculation. | GUO Jing YANG Chunping ZENG Dandan YE Yutang RAO Changhui | 2015 | 遥感学报2015，19，1： | 0 |
| 20 | Fabrication of fire-retardant building materials via a hyper-crosslinking chemical conversion process from waste polystyrenes显示文摘Polystyrene(PS)is rich in plastic materials,but it produces a large amount of waste every year,causing a huge burden on the environment.Although PS plastic is the source of a common'white pollution'in daily life,it still has a high utilization value.At the same time,the flammability of PS material determines that it cannot be applicated in places where fire accidents occur frequently.As a result,its application has been greatly limited.In order to realize the efficient utilization of waste PS and broaden its scope of application,PS was modified by hyper-crosslinking in order to improve its fire-retardant performance.In this method,the PS solution with high purity was obtained by dissolving waste PS foam with 1,2-dichloroethane(DCE),and then the hyper-crosslinked polymer with high specific surface area was prepared by adding cross-linking agent formaldehyde dimethyl acetal(FDA)and a Lewis-acid catalyst ferric chloride(FeCl_(3)).Further studies showed that the effects of the amount of cross-linking agent FDA,catalyst FeCl_(3) and PS on the reaction products were different.In addition,compared the as-prepared fire-retardant materials with PS foam from the aspects of flame retardancy and thermal insulation,it can be concluded that the fire-retardant performance of the materials prepared by this method has been significantly enhanced.And it is proved that this method is feasible towards the preparation of a large number of fire-retardant composite materials by using a scale-up experiment. | Changhui Liu Yuanhui Xie Ding Gao Xiancong Shi Zhonghao Rao | 2022 | Energy and Built Environment2022，3，2： | 0 |
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