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| 1 | Active optical clock显示文摘This article presents the principles and techniques of active optical clock, a special laser combining the laser physics of one-atom laser, bad-cavity gas laser, super-cavity stabilized laser and optical atomic clock together. As a simple example, an active optical clock based on thermal strontium atomic beam shows a quantum-limited linewidth of 0.51 Hz, which is insensitive to laser cavity-length noise, and may surpass the recorded narrowest 6.7 Hz of Hg ion optical clock and 1.5 Hz of very recent optical lattice clock. The estimated 0.1 Hz one-second instability and 0.27 Hz uncertainty are limited only by the rela- tivistic Doppler effect, and can be improved by cold atoms. | CHEN JingBiao | 2009 | Chinese Science Bulletin2009，54，3： | 19 |
| 2 | Realization of population inversion between 7S_(1/2) and 6P_(3/2) levels of cesium for four-level active optical clock显示文摘We demonstrate experimentally the population inversion between 7S1/2 and 6P3/2 levels of cesium in thermal cesium cell with a 455.5 nm pumping laser.We calculate the relative population probabilities at each level theoretically with the density matrix method.In a steady state,5.8% atoms are at 7S1/2 level and 2.9% at 6P3/2 level,which builds up the population inversion between the two levels.We obtain the fluorescence spectra produced in thermal cesium cell in our experiment.The measured relative intensity of each available fluorescence spectral line in the experiment agrees very well with the theoretical result.The demonstrated population inversion between 7S1/2 and 6P3/2 levels can be used to construct an active optical clock of four-level system with a wavelength of 1469.9 nm. | WANG YanFei WANG DongYing ZHANG TongGang HONG YeLong ZHANG ShengNan TAO ZhiMing XIE XiaoPeng CHEN JingBiao | 2013 | Science China(Physics,Mechanics & Astronomy)2013，56，6： | 6 |
| 3 | Active optical clock based on four-level quantum system显示文摘Active optical clock,a new conception of atomic clock,has been proposed recently.In this work,we propose a scheme of active optical clock based on four-level quantum system.The final accuracy and stability of two-level quantum system are limited by second-order Doppler shift of thermal atomic beam.To three-level quantum system,they are mainly limited by light shift of pumping laser field.These limitations can be avoided effectively by applying the scheme proposed here.Rubidium atom four-level quantum system,as a typical example,is discussed.The population inversion between 6S 1/2 and 5P 3/2 states can be built up at a time scale of 10-6 s.With the mechanism of active optical clock,in which the cavity mode linewidth is much wider than that of the laser gain profile,it can output a laser with quantum-limited linewidth narrower than 1 Hz in theory.An experimental configuration is designed to realize this active optical clock. | ZHANG TongGang WANG YanFei ZANG XiaoRun ZHUANG Wei CHEN JingBiao | 2013 | Chinese Science Bulletin2013，58，18： | 6 |
| 4 | Multi-threshold second-order phase transition in laser显示文摘We present a theory of the multi-threshold second-order phase transition,and experimentally demonstrate the multi-threshold secondorder phase transition phenomenon.With carefully selected parameters,in an external cavity diode laser system,we observe secondorder phase transition with multiple(three or four) thresholds in the measured power-current-temperature three dimensional phase diagram.Such controlled death and revival of second-order phase transition sheds new insight into the nature of ubiquitous secondorder phase transition.Our theory and experiment show that the single threshold second-order phase transition is only a special case of the more general multi-threshold second-order phase transition,which is an even richer phenomenon. | ZHUANG Wei YU DeShui LIU ZhiWen CHEN JingBiao | 2011 | Chinese Science Bulletin2011，56，35： | 4 |
| 5 | Faraday anomalous dispersion optical filter at 133Cs weak 459 nm transition显示文摘A 459 nm Faraday anomalous dispersion optical filter(FADOF) working at the side wings of the cesium6S1∕2→ 7P1∕2transition with weak oscillator strength is achieved. The transmittance of the higher side wing reaches 98% at a temperature of 179°C and magnetic field above 323 G. The experimental results coincide with the theoretical predictions in 1982 and 1995, which were not realized in experiments for over three decades. Due to its high transmittance, high accuracy, and narrow linewidth, the 459 nm FADOF can be applied in underwater optical communications, the building of active optical clocks, and laser frequency stabilization in active optical clocks. | Xiaobo Xue Duo Pan Xiaogang Zhang Bin Luo Jingbiao Chen Hong Guo | 2015 | Photonics Research2015，3，5： | 2 |
| 6 | Extreme Temperature Change of the Last 110 Years in Changchun,Northeast China显示文摘In China and East Asia,the long-term continuous observational data at daily resolution are insufficient,and thus there is a lack of good understanding of the extreme climate variation over the last 100 years plus.In this study,the extreme temperature indices defined by ETCCDI(Expert Team on Climate Change Detection and Indices)and local meteorological administrations were analyzed for Changchun City,Northeast China,by using the daily maximum temperature(Tmax)and daily minimum temperature(Tmin)over 1909?2018.The results showed that extreme cold events,such as cold days,cold nights,frost days,icing days,and low temperature days,decreased significantly at rates of?0.41 d(10 yr)^?1,?1.45 d(10 yr)^?1,?2.28 d(10 yr)^?1,?1.16 d(10 yr)?1 and?1.90 d(10 yr)^?1,respectively.Warm nights increased significantly at a rate of 1.71 d(10 yr)^?1,but warm days decreased slightly and the number of high temperature days decreased at a rate of?0.20 d(10 yr)?1.The frequency of cold surge events increased significantly at a rate of 0.25 d(10 yr)^?1,occurring mainly from the mid-1950s to late-1980s.The average Tmax,average Tmin and extreme Tmin increased at rates of 0.09℃(10 yr)^?1,0.36℃(10 yr)^?1 and 0.54℃(10 yr)^?1,respectively;and extreme Tmax decreased significantly at a rate of?0.17℃(10 yr)^?1.In 1909?2018,1951?2018 and 1979?2018,the indices related to cold events decreased,while the trends of the indices related to warm events were different for different periods. | Xiujing YU Guoyu REN Panfeng ZHANG Jingbiao HU Ning LIU Jianping LI Chenchen ZHANG | 2020 | Advances in Atmospheric Sciences2020，37，4： | 2 |
| 7 | The decoupling of the active structural acoustic control based on the theory of radiation modes显示文摘与放射模式的理论, piezoceramics 在健全放射的活跃控制被用作控制致动器。根据开始的四放射模式形状的特征,四组致动器的安排被介绍。理论分析和数字计算证明四组致动器不能仅仅有效地减少健全力量,而且 decouple 控制方程。当开始的四个放射模式的健全力量控制时,这些致动器能与单个输入/输出与多重输入/输出把复杂控制系统变换成几个简单、独立的系统。 | WU Jingbiao JIANG Zhe ZHU Lifeng | 2011 | Chinese Journal of Acoustics2011，30，1： | 2 |
| 8 | Controllable synthesis and optical properties of nano-CeO 2 via a facile hydrothermal route显示文摘 | Fanming Meng Leini Wang Jingbiao Cui | 2013 | Journal of Alloys and Compounds2013，，： | 1 |
| 9 | Continuous production of hydrogen from sorption-enhanced steam methane reforming in two parallel fixed-bed reactors operated in a cyclic manner显示文摘 | Li Zhenshan Cai Ningsheng Yang Jingbiao | 2007 | Energy & Fuels2007，21，5： | 1 |
| 10 | Optically Pumped Alkali Laser in Pure 87Rb Atom Cell Without Buffer Gas显示文摘 | WU Wenguo CHEN Jingbiao | 2011 | Chinese Journal of Electronics2011，20，2： | 1 |
| 11 | Research for the Structure System of Curved Wide Extra- Dosed Cable- Stayed Bridge显示文摘 | Jingrong Peng Jingbiao Luo | 2015 | Applied Mechanics and Materials2015，，： | 1 |
| 12 | Experimental and modeling study of the effect of CH 4 and pulverized coal on selective non-catalytic reduction process显示文摘 | Yanwen Zhang Ningsheng Cai Jingbiao Yang Bo Xu | 2008 | Chemosphere2008，，5： | 1 |
| 13 | Characterization of the diamond growth process using optical emission spectros- copy显示文摘 | Jingbiao Cui Rongchuan Fang | 1997 | Journal of Applied Physics1997，81，6： | 1 |
| 14 | Continuous production of hydrogen from sorption-enhanced steam meth- ane reforming in two parallel fixed-bed reactors operated in a cyclic manner 显示文摘 | Li Zhenshan Cai Ningsheng Yang Jingbiao | 2006 | Ind Eng Chem Res2006，45，26： | 1 |
| 15 | Bio-signal based elbow angle and torque simultaneous predictionduring isokinetic contraction显示文摘It is of great importance to decode motion dynamics of the human limbs such as the joint angle and torque in order to improve the functionality and provide more intuitive control in human-machine collaborative systems. In order to achieve feasible prediction,both the surface electromyography(sEMG) and A-mode ultrasound were applied to detect muscle deformation and motor intent.Six abled subjects were recruited to perform five trails elbow isokinetic flexion and extension, and each trail contained five repetitions, with muscle deformation and s EMG signals recorded simultaneously. The experimental datasets were categorized as:the ultrasound-EMG combined datasets, ultrasound-only datasets and EMG-only datasets. The support vector machine(SVM)regression model was developed for both elbow joint angle and torque prediction, based on the above three kinds of datasets. The root-mean-square error(RMSE) and the correlation coefficients(R) were applied to evaluate the prediction accuracy. The results across all the subjects for different datasets indicated that the combined datasets and the ultrasound datasets were superior to the sEMG datasets both on elbow joint angle and torque prediction, and there were no significant differences between the combined datasets and the ultrasound datasets. It turns out that elbow angle and torque can be reconstructed by A-mode ultrasound, and the significant findings pave the way towards the application of musculature-driven human-machine collaborative systems. | ZHOU Yu LIU JingBiao ZENG Jia LI KaiRu LIU HongHai | 2019 | Science China(Technological Sciences)2019，62，1： | 1 |
| 16 | Experimental and modeling study of the effect of CH4 and pulverized coal on selective non-catalytic reduction process显示文摘 | Zhang Yanwen Cai Ningsheng Yang Jingbiao | 2008 | Chemosphere2008，73，5： | 1 |
| 17 | Reduc- tion of Iron Oxide as an Oxygen Carrier by Coal Pyrol- ysis and Steam Char Gasification Intermediate Products 显示文摘 | YANG Jingbiao CAI Ningsheng LI Zhenshan | 2007 | Energy 8z Fuels2007，21，33： | 1 |
| 18 | Distribution of populations in excited states of electrodeless discharge lamp of Rb atoms显示文摘The intensity of fluorescence spectral lines of Rb atoms in the region of 350-1110nm is measured in eletrodeless discharge lamp. The population ratio between the excited states is calculated according to the spontaneous transition probabilities with rate equations. At the same time, the population density of energy level is also obtained. The results provide the potential applications of electrodeless discharge lamp in atomic filter and optical frequency reference at higher excited states without a pumping laser. | TAO ZhiMing WANG YanFei HONG YeLong WANG DongYing ZHANG ShengNan ZHUANG Wei CHEN JingBiao | 2013 | Chinese Science Bulletin2013，58，16： | 1 |
| 19 | Structure and transport studies on nanometer YBCO/PBCGO multilayers显示文摘We have fabricated M doped (M = Al, Co, Fe, Ga, Ni and Zn) PrBa2Cu3O7 (PBCO), i.e. PrBa2(Cu1-xMx)3O7. The doping levels x are 0.05, 0.10, 0.15, and 0.20. X-ray data indicated no significant second phase for substituting Cu by Al, Co, Fe and Ga up to 20%. However impurity phases were detected for Ni and Zn substituted samples with doping levels equal to and higher than 15%. At 77 K the electrical resistivity of these compounds is orders in magnitude higher than that of PBCO. We also found that although the lattice parameters in the doped samples differ from PBCO, all samples remain orthorhombic. The lattice parameters of the doped sample are very close to those of YBa2Cu3O7-δ (YBCO) and PBCO. For this reason these compounds are better materials to be used as the I-layer for YBCO SIS junctions. Results of structural and transport studies on 2000 thick PrBa2[Cu0.80G0.2]3O7 (PBCGO) and YBCO/PBCGO multilayers are presented in this paper. | CHEN Tar-Pin WU Ke LI Qi CHEN Ben WANG ShonZeng KANDEL Hom SOO YuChong TIPPARACH Udom CUI JingBiao SEQ HyeWon CHEN ChiJen | 2009 | Chinese Science Bulletin2009，54，15： | 0 |
| 20 | Efficient oxygen electrocatalysts with highly-exposed Co-N4 active sites on N-doped graphene-like hierarchically porous carbon nanosheets enhancing the performance of rechargeable Zn-air batteries显示文摘Designing bifunctional oxygen electrocatalysts with high activity,lasting stability,and low-cost for rechargeable zinc-air batteries(RZABs)is a tough challenge.Herein,an advanced electrocatalyst is prepared by anchoring atomically dispersed Co atoms on Ndoped graphene-like hierarchically porous carbon nanosheets(SA-Co-N4-GCs)and thereby forming Co-N4-C architecture.Its unique structure with excellent conductivity,large surface area,and three dimensional(3D)interconnected hierarchically porous architecture exposes not only more Co-N4 active sites to accelerate the kinetics of both oxygen reduction reaction(ORR)and oxygen evolution reaction(OER),but also provides an efficient charge/mass transport environment to reduce diffusion barrier.Consequently,SA-Co-N4-GCs exhibits excellent ORR/OER bifunctional activities and durability,surpassing noble-metal catalysts.Liquid RZABs using SA-Co-N4-GCs cathodes display a high open-circuit voltage of 1.51 V,a remarkable power density of 149.3 mW·cm−2,as well as excellent stability and rechargeability with faint increase in polarization even at a large depth of charge–discharge cycle with 16 h per cycle over an entire 600 h long-term test.Moreover,flexible quasi-solid-state RZABs with SA-Co-N4-GCs cathodes also deliver a considerable power density of 124.5 mW·cm−2,which is even higher than that of liquid batteries using noble-metal catalysts.This work has thrown new insight into development of high-performance and low-cost electrocatalysts for energy conversion and storage. | Nengfei Yu Hui Chen Jingbiao Kuang Kailin Bao Wei Yan Jilei Ye Zhongtang Yang Qinghong Huang Yuping Wu Shigang Sun | 2022 | Nano Research2022，15，8： | 0 |
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