|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Massive individual orbital angular momentum channels for multiplexing enabled by Dammann gratings显示文摘Data transmission rates in optical communication systems are approaching the limits of conventional multiplexing methods.Orbital angular momentum(OAM)in optical vortex beams offers a new degree of freedom and the potential to increase the capacity of free-space optical communication systems,with OAM beams acting as information carriers for OAM division multiplexing(OAM-DM).We demonstrate independent collinear OAM channel generation,transmission and simultaneous detection using Dammann optical vortex gratings(DOVGs).We achieve 80/160 Tbit s^(-1) capacity with uniform power distributions along all channels,with 1600 individually modulated quadrature phase-shift keying(QPSK)/16-QAM data channels multiplexed by 10 OAM states,80 wavelengths and two polarizations.DOVG-enabled OAM multiplexing technology removes the bottleneck of massive OAM state parallel detection and offers an opportunity to raise optical communication systems capacity to Pbit s^(-1) level. | Ting Lei Meng Zhang Yuru Li Ping Jia Gordon Ning Liu Xiaogeng Xu Zhaohui Li Changjun Min Jiao Lin Changyuan Yu Hanben Niu Xiaocong Yuan | 2015 | Light(Science & Applications)2015，4，1： | 47 |
| 2 | Rare earth metal modified three dimensionally ordered macroporous MnO_x-CeO_2 catalyst for diesel soot combustion显示文摘Three dimensionally ordered macroporous(3 DOM) Ce-based catalysts were successfully prepared via a surfactant-assisted colloidal crystal template(CCT) route. The as-synthesized catalysts showed wellordered structures with macropores and small interconnected pore windows. The Raman results indicate that the catalyst persists pure fluorite cubic phases until the molar ratio of Mn exceeds 0.3, therefore MnO_x particles form and impede the contact of the active site and the reagent and restraining soot combustion. The doping of Nd into MnO_x-CeO_2 enhances the catalytic activity because of increased oxygen vacancy, Mn^(4+)content and stronger redox ability. Nd-doping also improves thermal stability of the catalyst due to less sintering and none phase separation after thermal aging. The fresh and aged Mn_(0.3)Ce_(0.6)Nd_(0.1)O_2 catalysts show the maximum oxidation rate for soot at 331 and 355 ℃ in the O_2/N_2 atmosphere, achieving a nearly 100% CO_2 selectivity. | qing tang jun du bin xie yu yang wenchong yu changyuan tao | 2018 | Journal of Rare Earths2018，36，1： | 7 |
| 3 | Whole-genome sequencing provides insights into the genetic diversity and domestication of bitter gourd(Momordica spp.)显示文摘Bitter gourd(Momordica charantia)is a popular cultivated vegetable in Asian and African countries.To reveal the characteristics of the genomic structure,evolutionary trajectory,and genetic basis underlying the domestication of bitter gourd,we performed whole-genome sequencing of the cultivar Dali-11 and the wild small-fruited line TR and resequencing of 187 bitter gourd germplasms from 16 countries.The major gene clusters(Bi clusters)for the biosynthesis of cucurbitane triterpenoids,which confer a bitter taste,are highly conserved in cucumber,melon,and watermelon.Comparative analysis among cucurbit genomes revealed that the Bi cluster involved in cucurbitane triterpenoid biosynthesis is absent in bitter gourd.Phylogenetic analysis revealed that the TR group,including 21 bitter gourd germplasms,may belong to a new species or subspecies independent from M.charantia.Furthermore,we found that the remaining 166 M.charantia germplasms are geographically differentiated,and we identified 710,412,and 290 candidate domestication genes in the South Asia,Southeast Asia,and China populations,respectively.This study provides new insights into bitter gourd genetic diversity and domestication and will facilitate the future genomics-enabled improvement of bitter gourd. | Junjie Cui Yan Yang Shaobo Luo Le Wang Rukui Huang Qingfang Wen Xiaoxia Han Nansheng Miao Jiaowen Cheng Ziji Liu Changyuan Zhang Chengcheng Feng Haisheng Zhu Jianwen Su Xinjian Wan Fang Hu Yu Niu Xiaoming Zheng Yulan Yang Dai Shan Zhensheng Dong Weiming He Narinder P.S.Dhillon Kailin Hu | 2020 | Horticulture Research2020，7，1： | 7 |
| 4 | A novel method for extracting vanadium by low temperature sodium roasting from converter vanadium slag显示文摘Long-term high temperature in conventional vanadium extraction process would cause particles to be sintered and wrapped, thus reducing extraction efficiency of vanadium. Based on the purpose of directional conversion and process intensification, this work proposed a combination of low temperature sodium roasting and high efficiency selective oxidation leaching in vanadium extraction. The investigation of the reaction mechanism suggested that the structure of vanadium slag was changed by roasting, which also caused the fracture of spinel.The addition of MnO2 promoted the directional oxidation of low-valent vanadium into high valence. It also found that Na2S2O8 could oxidize low-valent vanadium effectively in leaching. The leaching efficiency of vanadium reached 87.74% under the optimum conditions, including a roasting temperature of 650 ℃, a roasting time of 2.0 h, a molar ratio of sodium-to-vanadium of 0.6, a MnO2(roasting additive) dosage of 5 wt% and a Na2S2O8(leaching oxidant) dosage of 5 wt%. This percentage is 7.18% higher than that of direct roasting-andleaching under the same conditions. | Rongrui Deng Hao Xiao Zhaoming Xie Zuohua Liu Qiang Yu Geng Chen Changyuan Tao | 2020 | Chinese Journal of Chemical Engineering2020，28，8： | 4 |
| 5 | Phyllotaxis-inspired nanosieves with multiplexed orbital angular momentum显示文摘Nanophotonic platforms such as metasurfaces,achieving arbitrary phase profiles within ultrathin thickness,emerge as miniaturized,ultracompact and kaleidoscopic optical vortex generators.However,it is often required to segment or interleave independent sub-array metasurfaces to multiplex optical vortices in a single nano-device,which in turn affects the device’s compactness and channel capacity.Here,inspired by phyllotaxis patterns in pine cones and sunflowers,we theoretically prove and experimentally report that multiple optical vortices can be produced in a single compact phyllotaxis nanosieve,both in free space and on a chip,where one meta-atom may contribute to many vortices simultaneously.The time-resolved dynamics of on-chip interference wavefronts between multiple plasmonic vortices was revealed by ultrafast time-resolved photoemission electron microscopy.Our nature-inspired optical vortex generator would facilitate various vortex-related optical applications,including structured wavefront shaping,free-space and plasmonic vortices,and high-capacity information metaphotonics. | Zhongwei Jin David Janoschka Junhong Deng Lin Ge Pascal Dreher Bettina Frank Guangwei Hu Jincheng Ni Yuanjie Yang Jing Li Changyuan Yu Dangyuan Lei Guixin Li Shumin Xiao Shengtao Mei Harald Giessen Frank Meyer zu Heringdorf Cheng-Wei Qiu | 2021 | eLight2021，1，1： | 3 |
| 6 | Joint timing and frequency synchronization in coherent optical OFDM systems显示文摘In this paper,we review our joint timing and frequency synchronization algorithms in coherent optical orthogonal frequency division multiplexing(CO-OFDM)systems.We first present a timing estimation method by designing the pattern of the training symbol,whose timing metric has a sharp and clear peak,to ensure accurate timing offset(TO)estimation performance.Then we provide both data-aided(DA)and blind(BL)approaches to estimate the carrier frequency offset(CFO).For the DA algorithm,we utilize the same training symbol structure as the timing estimation does,while for the BL algorithm,we utilize the zero-subcarrier power(ZSP)to achieve full-range CFO estimation.Note that our joint timing and frequency synchronization approaches require only one OFDM symbol,which ensure not only the data transmission efficiency,but also the TO and CFO estimation performance.A modified BL ZSP algorithm is proposed to further improve the CFO estimation performance by taking the power average over a series of OFDM symbols.The effectiveness of the TO estimation algorithm,and both the DA and BL CFO estimation algorithms are verified and demonstrated in both simulations and experiments. | Xinwei DU Pooi-Yuen KAM Changyuan YU | 2019 | Frontiers of Optoelectronics2019，12，1： | 3 |
| 7 | Contactless vital signs monitoring based on few‐mode and multi‐core fibers显示文摘Few-mode and multi-core fibers are proposed and demonstrated for contactless vital signs monitoring in this paper.In-line optical fiber interferometers using few-mode and multi-core fibers are designed and offset splicing is utilized for mode excitation.Extinction ratio and insertion loss are analyzed experimentally under different offset distances.The fabricated in-line interferometers are packaged under the mattress to realize contactless vital signs signals collection.By using filtering techniques,both respiration and heartbeat signals can be recovered successfully,and respiration as well as heartbeat ratio are obtained.Mode excitation and interference are theoretically analyzed in few-mode fiber while curvature sensing experiments using multi-core fiber interferometer are performed to verify its excellent performance on vital signs monitoring.The successful demonstration on contactless vital signs monitoring makes few-mode and multi-core fibers promising candidates for healthcare applications. | Fengze Tan Weimin Lyu Shuyang Chen Zhengyong Liu Changyuan Yu | 2020 | Opto-Electronic Advances2020，3，5： | 2 |
| 8 | Variation of fluxes of water vapor, sensible heat and carbon dioxide above winter wheat and maize canopies显示文摘Surface energy fluxes were measured using Bowen-Ratio Energy Balance technique (BREB) and eddy correlation system at Luancheng of Hebei Province, on the North China Plain from 1999 to 2001. Average diumal variation of surface energy fluxes and CO2 flux for maize showed the inverse 'U 'type. The average peak fluxes did not appear at noon, but after noon. The average peak CO2 flux was about 1.65 mgm-2 s-1. Crop water use efficiency (WUE) increased quickly in the morning, stabilized after 10:00 and decreased quickly after 15:00 with no evident peak value. The ratio of latent heat flux (λE) to net solar radiation (Rn) was always higher than 70% during winter wheat and maize seasons. The seasonal average ratio of sensible heat flux (H) divided by Rn stayed at about 15% above the field surface; the seasonal average ratio of conductive heat flux (G) divided by Rn varied between 5% and 13%, and the average G/Rn from the wheat canopy was evidently higher than that from the maize canopy. The evaporative fraction (EF) is correlated to the Bowen ratio in a reverse function. EF for winter wheat increased quickly during that revival stage, after the stage, it gradually stabilized to 1.0, and fluctuated around 1.0. EF for maize also fluctuated around 1.0 before the later grain filling stage, and decreased after that stage. | ZHANG Yongqiang, SHEN Yanjun, YU Qiang, LIU Changming,A. Kondoh, TANG Changyuan, SUN Hongyong, JIA Jinsheng(1. Inst. of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China 2. Shijiazhang Inst. of Agricultural Modernization, CAS, | 2002 | Journal of Geographical Sciences2002，12，3： | 2 |
| 9 | Performance improvement by tilting receiver plane in M-QAM OFDM visible light communications 显示文摘 | WANG Zixiong YU Changyuan ZHONG Wende | 2011 | Optics Express(S0030-3941)2011，19，13： | 1 |
| 10 | Performance of a novel LED lamp arrangement to reduce SNR fluctuation for multi-user visible light communication systems 显示文摘 | WANG Zixiong YU Changyuan ZHONG Wende | 2012 | Optics Express(S0030-3941)2012，20，4： | 1 |
| 11 | Perform- ance of a novel LED lamp arrangement to reduce SNR fluctua- tion for muhi-user visible light communication systems 显示文摘 | Wang Zixiong Yu Changyuan Zhong Wende | 2012 | Optics Express2012，20，4： | 1 |
| 12 | Decision-Aided Carrier Phase Estimation for Coherent Optical Communications 显示文摘 | Zhang Shaoliang Kam Pooi-Yuen Yu Changyuan | 2010 | J of Lightwave Technol- ogy2010，28，11： | 1 |
| 13 | Deci- sion-Aided, Pilot-Aided, Decision-Feedback Phase Esti- mation for Coherent Optical OFDM Systems 显示文摘 | CAO Shengjiao KAM Pooi Yuen YU Changyuan | 2012 | IEEE Photonics Technology Letters2012，24，22： | 1 |
| 14 | Theoretical analysis of PAM-N and M-QAM BER computation with single-sideband signal显示文摘In this paper,the theoretical bit error rate(BER)of N-level pulse amplitude modulation(PAMN)and M-ary quadrature amplitude modulation(M-QAM)have been studied and compared under different scenarios,including(i)PAM with intensity modulation with direct detection(IM/DD)and field modulation with detection(FMD)(including coherent detection and single-sideband modulation with direct detection(SSB-DD)),and(ii)QAM with coherent detection and SSB-DD.Considering the relationship between the symbol spacing and signal-to-noise ratio(SNR),we provide the mathematical BER equations,including the optical signal-to-noise ratio(OSNR)and carrier-to-signal power ratio(CSPR),especially for PAM signals.To verify the validity of our theoretical expressions for SSB systems,transmissions with 224-Gb/s SSBPAM4/16QAM signals using the Kramers-Kronig(KK)receiver were implemented on a unified optical system platform.The simulation results agreed well with theoretical calculations both in back-to-back(BtB)and 120-km transmission scenarios,which showed that the BER evaluation methods can serve as a theoretical guidance and system assessment criteria for SSB scenarios. | Dongxu LU Xian ZHOU Yuqiang YANG Jiahao HUO Jinhui YUAN Keping LONG Changyuan YU Alan Pak Tao LAU Chao LU | 2021 | Science China(Information Sciences)2021，64，8： | 1 |
| 15 | Use of 18O,2H and 15N to identify nitrate contamination of groundwater in a wastewater irrigated field near the city of Shijiazhuang,China显示文摘 | Chen Jianyao Tang Changyuan Yu Jingjie | 2006 | Journal of Hydrology2006，326，14： | 1 |
| 16 | Use of ^18O,^2H and ^15N to identify nitrate contamination of groundwater in a wastewater irrigated field near the city of Shijiazhuang,China显示文摘 | Chen Jianyao Tang Changyuan Yu Jingjie | 2006 | Journal of Hydrology2006，326，14： | 1 |
| 17 | Use of 180, 2H and 15N to identify nitrate contamination of groundwater in a wastewater irrigated field near the city of Shijiazhuang, China显示文摘 | Chen Jianyao Tang Changyuan Yu Jingjie | 2006 | Journal of Hydrology2006，326，： | 1 |
| 18 | Performance improvement by tilting receiver plane in M-QAM OFDM visible light com- munications显示文摘 | WANG Zixiong YU Changyuan ZHONG Wen-De | 2011 | Optics Express2011，19，13： | 1 |
| 19 | Use of tsO, 2H and XSN to identify nitrate contamination of groundwater in a wastewater irrigated field near the city of Shijiazhuang, China 显示文摘 | CHEN Jianyao TANG Changyuan YU Jingjie | 2006 | Journal of Hydrology2006，326，14： | 1 |
| 20 | Preparation of Titanium-based Polyoxometalatxiue-ionic Liquid Catalysts and Application in the Synthesis of Degradable Polyester显示文摘Three kinds of Keggin-type titanium-based polyoxometalate-ionic liquid catalysts were prepared,and the chemical structure,crystal structure and thermal stability of the three catalysts were analyzed and tested by infrared spectrometer,ultraviolet-visible spectrometer,X-ray diffractometer,and thermogravimetric analyzer,respectively.Afterwards,their performance in catalyzing the coupling reaction of ethylene carbonate(EC)and dimethyl succinate(DMSu)to synthesize polyethylene succinate(PES)was studied,and the effects of different metals on the catalytic performance and the mechanism of action were discussed.The optimal process parameters for the coupling reaction were explored.Finally,the chemical structure of PES was characterized by infrared spectrometer.The results show that under the same process parameters,the polyoxometalate-ionic liquid catalyst Bmim_(5)[Ti(H_(2)O)TiMo_(11)O_(39)]had the best catalytic effect.Under the optimal process parameters,Bmim_(5)[Ti(H_(2)O)TiMo_(11)O_(39)]had obvious inhibitory effect on side reactions,and the yield and selectivity of PES prepolymer were up to 72.23%and 88.64%. | Ran CHEN Changyuan YU Liying GUO Kun LIU Xiudan ZHAO Zezhong JIANG | 2022 | Meteorological and Environmental Research2022，13，4： | 1 |
您所在的机构暂未开通此部分的功能，请联系管理员