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| 1 | Q-switched and mode-locked Er-doped fiber laser using PtSe2 as a saturable absorber显示文摘We report a passively Q-switched and mode-locked erbium-doped fiber laser(EDFL) based on PtSe_2, a new two-dimensional material, as a saturable absorber(SA). Self-started Q-switching at 1560 nm in the EDFL was achieved at a threshold pump power of 65 mW, and at the maximum pump power of 450 m W, the maximum single Q-switched pulse energy is 143.2 n J. Due to the polarization-dependent characteristics of the PtSe_2-based SA, the laser can be switched from the Q-switched state to the mode-locked state by adjusting the polarization state. A mode-locked pulse train with a repetition rate of 23.3 MHz and a pulse width of 1.02 ps can be generated when the pump power increases to about 80 m W, and the stable mode-locked state is maintained until the pump power reaches its maximum 450 m W. The maximum single mode-locked pulse energy is0.53 nJ. This is the first time to our knowledge that successful generation of stable Q-switched and mode-locked pulses in an Er-doped fiber laser has been obtained by using PtSe_2 as a saturable absorber. | KANG ZHANG MING FENG YANGYANG REN FANG LIu XINGSHUO CHEN JIE YANG XIAO-QING VAN FENG SONG JIANGUO TIAN | 2018 | Photonics Research2018，6，9： | 10 |
| 2 | Kinetics and mechanisms of mitotic inheritance of DNA methylation and their roles in aging-associated methylome deterioration显示文摘Mitotic inheritance of the DNA methylome is a challenging task for the maintenance of cell identity.Whether DNA methylation pattern in different genomic contexts can all be faithfully maintained is an open question.A replication-coupled DNA methylation maintenance model was proposed decades ago,but some observations suggest that a replication-uncoupled maintenance mechanism exists.However,the capacity and the underlying molecular events of replication-uncoupled maintenance are unclear.By measuring maintenance kinetics at the single-molecule level and assessing mutant cells with perturbation of various mechanisms,we found that the kinetics of replication-coupled maintenance are governed by the UHRF1–Ligase 1 and PCNA–DNMT1 interactions,whereas nucleosome occupancy and the interaction between UHRF1 and methylated H3K9 specifically regulate replication-uncoupled maintenance.Surprisingly,replication-uncoupled maintenance is sufficiently robust to largely restore the methylome when replication-coupled maintenance is severely impaired.However,solo-WCGW sites and other CpG sites displaying aging-and cancer-associated hypomethylation exhibit low maintenance efficiency,suggesting that although quite robust,mitotic inheritance of methylation is imperfect and that this imperfection may contribute to selective hypomethylation during aging and tumorigenesis. | Xuan Ming Zhuqiang Zhang Zhuoning Zou Cong Lv Qiang Dong Qixiang He Yangyang Yi Yingfeng Li Hailin Wang Bing Zhu | 2020 | Cell Research2020，30，11： | 4 |
| 3 | Distributed Energy Sharing in Energy Internet Through Distributed Averaging显示文摘This paper proposes a distributed averaging iteration algorithm for energy sharing in microgrids of Energy Internet based on common gossip algorithms. This algorithm is completely distributed and only requires communications between neighbors. Through this algorithm, the Energy Internet not only allocates the energy effectively based on the load condition of grids, but also reasonably schedules the energy transmitted between neighboring grids. This study applies theoretical analysis to discuss the condition in which this algorithm can finally reach supply-and-demand balance. Subsequently, the related simulation validates the performance of the algorithm under various conditions. | Yangyang Ming Jie Yang Junwei Cao Ziqiang Zhou Chunxiao Xing | 2018 | Tsinghua Science and Technology2018，23，3： | 3 |
| 4 | Author Correction: Kinetics and mechanisms of mitotic inheritance of DNA methylation and their roles in aging-associated methylome deterioration显示文摘We apologize for the mistake of the fund information in the acknowledgements.The correct information is as follows.This correction does not affect the conclusion of the work. | Xuan Ming Zhuqiang Zhang Zhuoning Zou Cong Lv Qiang Dong Qixiang He Yangyang Yi Yingfeng Li Hailin Wang Bing Zhu | 2021 | Cell Research2021，31，3： | 2 |
| 5 | Change of soil physical properties under long-term natural vegetation restoration in the Loess Plateau of China 显示文摘 | LI Yangyang SHAO Ming'an | 2006 | Journal of Arid Environments2006，64，1： | 1 |
| 6 | A novel Gd-based phosphor NaGdGeO_(4):Bi^(3+),Li^(+)with super-long ultraviolet-A persistent luminescence显示文摘In very recent years,ultraviolet(UV)persistent luminescent materials(PLMs)have attracted widespread attention due to their potential biological applications.However,owing to the lack of suitable emitters and hosts,the design and development of excellent UV PLMs remain challenging.Here,we report a new Gd-based PLM NaGdGeO_(4):Bi^(3+)with super-long UVA persistent luminescence(PersL).By further codoping Li^(+)ions to increase the concentration of traps,the UVA PersL intensity of NaGdGeO_(4):Bi^(3+)is increased by 5.5 times.The optimal NaGdGeO_(4):Bi^(3+),Li^(+)exhibits excellent UVA PersL and can persist for more than 200 h.Moreover,the phosphor NaGdGeO_(4):Bi^(3+),Li^(+)also exhibits photostimulated property with a red LED or NIR laser excitation after the long-term decay,and can be activated by X-ray.This promising Gd-based UVA PLM is expected to have potential applications in biomedicine through triggering photocatalysts or photosensitizers by its UVA PersL to achieve photodynamic therapy and its potential ability of magnetic resonance(MR)imaging due to Gd^(3+)ions as MR imaging probe contained in the host NaGdGeO_(4). | Lin Liu Kexin Yu Liyan Ming Yangyang Sheng Shenghui Zheng Liang Song Junpeng Shi Yun Zhang | 2022 | Journal of Rare Earths2022，40，9： | 1 |
| 7 | Effects of ion bombardment on microcrystalline silicon growth by inductively coupled plasma assistant magnetron sputtering显示文摘Hydrogenated microcrystalline silicon(c-Si:H) thin films were deposited by inductively coupled plasma assistant magnetron sputtering(ICP-MS) in an Ar-H 2 gas mixture.The role of ion bombardment in the growth of c-Si:H films was studied with increasing negative bias voltages on the substrate holder from 0 to 100 V.Raman scattering,X-ray diffraction(XRD),Fourier transform infrared(FTIR) spectroscopy and transmission electron microscopy(TEM) were performed to investigate the microstructure changes of deposited Si films.Raman scattering showed that the high energy ion bombardment resulted in crystalline degradation of Si films.The XRD results showed the decrease and even elimination of preferential growth orientation of crystalline Si films with ion bombardment energy increase.The SiH bonding configuration changes and the increase of bonded hydrogen concentration were determined with the analysis of FTIR spectra.Furthermore,the dramatic evolution of cross-sectional morphology of Si thin films was detected by TEM observation. | HE YangYang SU YuanJun ZHU Ming CAO BaoSheng DONG Bin | 2012 | Science China(Physics,Mechanics & Astronomy)2012，55，11： | 0 |
| 8 | A novel Li^(+)-doped MgLuGaO_(4)phosphor with stable white-light emission and long persistent luminescence显示文摘In recent years,white persistent luminescence materials have received extensive attention due to the potential application of white light in the field of plant growth lighting.The white persistent luminescence materials synthesized by traditional methods either have strict requirements on the concentration of doped ions or cannot produce white light continuously and stably due to different decay rates of various emission centers,which limits their further application.In our work,we successfully synthesized a novel Li^(+)-doped MgLuGaO_(4)phosphor with stable white-light emission and long persistent luminescence.The broadband emission of MgLuGaO_(4):Li^(+)is mainly located at 350-650 nm,which has no change at different decay time,showing stable white-light emission.The persistent luminescence intensity is increased by 3.8 times and the persistent luminescence time is extended from 24 h to more than 36 h by doping Li+ions.Stable white-light and long persistent luminescence emission make it promising to be used in plant growth lighting. | Yangyang Sheng Liyan Ming Lin Liu Peng Lin Junpeng Shi Liang Song Yun Zhang | 2022 | Journal of Rare Earths2022，40，9： | 0 |
| 9 | On the Convergence of Asynchronous Parallel Iteration with Unbounded Delays显示文摘Recent years have witnessed the surge of asynchronous parallel(asyncparallel)iterative algorithms due to problems involving very large-scale data and a large number of decision variables.Because of asynchrony,the iterates are computed with outdated information,and the age of the outdated information,which we call delay,is the number of times it has been updated since its creation.Almost all recent works prove convergence under the assumption of a finite maximum delay and set their stepsize parameters accordingly.However,the maximum delay is practically unknown.This paper presents convergence analysis of an async-parallel method from a probabilistic viewpoint,and it allows for large unbounded delays.An explicit formula of stepsize that guarantees convergence is given depending on delays’statistics.With p+1 identical processors,we empirically measured that delays closely follow the Poisson distribution with parameter p,matching our theoretical model,and thus,the stepsize can be set accordingly.Simulations on both convex and nonconvex optimization problems demonstrate the validness of our analysis and also show that the existing maximum-delay-induced stepsize is too conservative,often slows down the convergence of the algorithm. | Zhimin Peng Yangyang Xu Ming Yan Wotao Yin | 2019 | Journal of the Operations Research Society of China2019，7，1： | 0 |
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