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Localization method of subsynchronous oscillation source based on high-resolution time-frequency distribution image and CNN

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Global Energy Interconnection 2024年第1期7卷 1-13页

作者： Hui Liu yundan Cheng Yanhui Xu Guanqun Sun Rusi Chen xiaodong yu Institute of Electric Power Systems School of Electrical and Electronic EngineeringNorth China Electric Power UniversityBeijing 102206P.R.China Electric Power Research Institute of State Grid Hubei Electric Power Co. Ltd.Wuhan 430077P.R.China Central China Branch of State Grid Corporation of China Wuhan 430077P.R.China

The penetration of new energy sources such as wind power is increasing,which consequently increases the occurrence rate of subsynchronous oscillation events.However,existing subsynchronous oscillation source-identification methods primarily analyze fixed-mode oscillations and rarely consider time-varying features,such as frequency drift,caused by the random volatility of wind farms when oscillations occur.This paper proposes a subsynchronous oscillation sourcelocalization method that involves an enhanced short-time Fourier transform and a convolutional neural network(CNN).First,an enhanced STFT is performed to secure high-resolution time-frequency distribution(TFD)images from the measured data of the generation unit ports.Next,these TFD images are amalgamated to form a subsynchronous oscillation feature map that serves as input to the CNN to train the localization model.Ultimately,the trained CNN model realizes the online localization of subsynchronous oscillation sources.The effectiveness and accuracy of the proposed method are validated via multimachine system models simulating forced and natural oscillation events using the Power Systems Computer Aided Design platform.Test results show that the proposed method can localize subsynchronous oscillation sources online while considering unpredictable fluctuations in wind farms,thus providing a foundation for oscillation suppression in practical engineering scenarios.

关键词： Subsynchronous oscillation source localization Synchronous squeezing transform Enhanced short-time Fourier transform Convolutional neural networks

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The impact of the Rural Minimum Living Standard Guarantee(Rural Dibao)Program on child nutrition outcomes

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Journal of Integrative Agriculture 2024年第2期23卷 444-456页

作者： Dian Chen Xiangming Fang yu Chen xiaodong Zheng Zhuo Chen Rodney B.W.Smith Academy of Global Food Economics and Policy China Agricultural UniversityBeijing 100083China School of Public Health Georgia State UniversityAtlanta 30303USA School of Economics Zhejiang Gongshang UniversityHangzhou 310018China College of Public Health University of GeorgiaAthens 30602USA Department of Applied Economics University of MinnesotaSaint Paul 55108USA

The Rural Minimum Living Standard Guarantee(Rural Dibao)is an important unconditional cash transfer program to alleviate poverty in rural China.Despite the importance of children’s nutrition in breaking poverty cycles,little is known about the impact of Rural Dibao on child nutrition outcomes.Using China Family Panel Studies(CFPS),this paper examines the effects of Rural Dibao on child nutrition outcomes and investigates potential pathways and heterogeneous effects.We exploit propensity score matching and difference-in-differences techniques to evaluate the effects of the Rural Dibao program on child nutrition outcomes.Our results suggest that Rural Dibao significantly impacts the nutrition outcomes of children up to 15 years of age.Specifically,our results suggest that Rural Dibao improves child height-to-age z-scores by 1.05 standard deviations and lowers the probability of stunting by 11.9 percentage points.Additional analyses suggest that increased protein intake is the main pathway through which Rural Dibao participation contributes to better nutrition outcomes.We also find that the effect of the program is more pronounced among girls,children who are non-left-behind or live with highly educated mothers,and those from low-income families and poor areas.Our findings suggest that Rural Dibao participation helps improve child nutrition outcomes through improving diet quality.

关键词： Rural Minimum Living Standard Guarantee nutrition height-to-age z-scores stunting rural China

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Breaking Barriers

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China Weekly 2024年第6期 22-31页

作者： yu xiaodong 不详

China and France are enhancing bilateral ties on a landmark diplomatic anniversary,with Paris calling for greater strategic autonomy in Europe.when Chinese President Xi Jinping arrived in Paris on a State visit to France on May 5,he was received with a red carpet and a guard of honor.The next day,French President Emmanuel Macron held a grand welcome ceremony for Xi and his wife,Peng Liyuan.

关键词： strategic Paris honor

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PABP-driven secondary condensed phase within RSV inclusion bodies activates viral mRNAs for ribosomal recruitment

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Virologica Sinica 2024年第2期39卷 235-250页

作者： Qiang Zhang Hanzhe Ye Cong Liu Haiwu Zhou Mingbin He xiaodong Liang yu Zhou Kun Wang Yali Qin Zhifei Li Mingzhou Chen State Key Laboratory of Virology and Modern Virology Research Center College of Life SciencesWuhan UniversityWuhan430072China Taikang Center for Life and Medical Sciences Wuhan UniversityWuhan430072China Hubei Jiangxia Laboratory Wuhan430200China

Inclusion bodies(IBs)of respiratory syncytial virus(RSV)are formed by liquid-liquid phase separation(LLPS)and contain internal structures termed“IB-associated granules”(IBAGs),where anti-termination factor M2-1 and viral mRNAs are concentrated.However,the mechanism of IBAG formation and the physiological function of IBAGs are unclear.Here,we found that the internal structures of RSV IBs are actual M2-1-free viral messenger ribonucleoprotein(mRNP)condensates formed by secondary LLPS.Mechanistically,the RSV nucleoprotein(N)and M2-1 interact with and recruit PABP to IBs,promoting PABP to bind viral mRNAs transcribed in IBs by RNArecognition motif and drive secondary phase separation.Furthermore,PABP-eIF4G1 interaction regulates viral mRNP condensate composition,thereby recruiting specific translation initiation factors(eIF4G1,eIF4E,eIF4A,eIF4B and eIF4H)into the secondary condensed phase to activate viral mRNAs for ribosomal recruitment.Our study proposes a novel LLPS-regulated translation mechanism during viral infection and a novel antiviral strategy via targeting on secondary condensed phase.

关键词： Respiratory syncytial virus(RSV) Inclusion bodies(IBs) Biomolecular condensates Liquid-liquid phase separation(LLPS) Secondary condensed phase mRNA activation

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Salicylic acid inhibits gibberellin signaling through receptor interactions

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Molecular Plant 2022年第11期15卷 1759-1771页

作者： xiaodong yu Xiaoyu Cui Chong Wu Shixi Shi Shunping Yan Hubei Hongshan Laboratory Wuhan 430070China College of Life Science and Technology Huazhong Agricultural UniversityWuhan 430070China Shenzhen Institute of Nutrition and Health Huazhong Agricultural UniversityShenzhen 518000China Shenzhen Branch Guangdong Laboratory for Lingnan Modern AgricultureShenzhen 518000China Agricultural Genomics Institute at Shenzhen Chinese Academy of Agricultural SciencesShenzhen 518000China

It is well known that plants activate defense responses at the cost of growth.However,the underlying molecular mechanisms are not well understood.The phytohormones salicylic acid(SA)and gibberellin(GA)promote defense response and growth,respectively.Here we show that SA inhibits GA signaling to repress plant growth.We found that the SA receptor NPR1 interacts with the GA receptor GID1.Further biochemical studies revealed that NPR1 functions as an adaptor of ubiquitin E3 ligase to promote the polyubiquitination and degradation of GID1,which enhances the stability of DELLA proteins,the negative regulators of GA signaling.Genetic analysis suggested that NPR1,GID1,and DELLA proteins are all required for the SA-mediated growth inhibition.Collectively,our study not only uncovers a novel regulatory mechanism of growth-defense trade-off but also reveals the interaction of hormone receptors as a new mode of hormonal crosstalk.

关键词： salicylic acid gibberellin trade-off receptor growth inhibition

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Electronic structures and Mott state of epitaxial TaS_(2) monolayers

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Science China(Physics,Mechanics & Astronomy) 2024年第5期67卷 91-97页

作者： Qichao Tian Chi Ding xiaodong Qiu Qinghao Meng Kaili Wang Fan yu yuyang Mu Can Wang Jian Sun Yi Zhang National Laboratory of Solid State Microstructure School of PhysicsNanjing UniversityNanjing 20093China Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093China School of Physics and Electronic Sciences Changsha University of Science and TechnologyChangsha 410114China Hefei National Laboratory Hefei 230088China

Layered material TaS2hosts multiple structural phases and exotic correlated quantum states,including charge density wave(CDW),superconductivity,quantum spin liquid,and Mott insulating state.Here,we synthesized TaS_(2)monolayers in H and T phases using the molecular beam epitaxial(MBE)method and studied their electronic structures via angle-resolved photoemission spectroscopy(ARPES).We found that the H phase TaS_(2)(H-TaS_(2))monolayer is metallic,with an energy band crossing the Fermi level.In contrast,the T phase TaS_(2)(T-TaS_(2))monolayer shows an insulated energy gap at the Fermi level,while the normal calculated band structure implies it should be metallic without any band gap.However,by considering Hubbard interaction potential U,further density functional theory(DFT)calculation suggests that monolayer T-TaS_(2)could be a CDW Mott insulator,and the DFT+U calculation matches well with the ARPES result.More significantly,the temperature-dependent ARPES result indicates that the CDW Mott state in the T-TaS_(2)monolayer is more robust than its bulk counterpart and can persist at room temperature.Our results reveal that the dimensional effect can enhance the CDW Mott state and provide valuable insights for further exploring the exotic properties of monolayer TaS2.

关键词： temperature monolayer state

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Systems science in the new era: intelligent systems and big data

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Science China(Information Sciences) 2024年第3期67卷 308-310页

作者： Wenwu yu Duxin CHEN Hongzhe LIU He WANG Jinde CAO Zengru DI Xiaojun DUAN Bin JIA xiaodong DING Yiguang HONG School of Mathematics Southeast University Purple Mountain Laboratories International Academic Center of Complex Systems Beijing Normal University College of Science National University of Defense Technology School of Systems Science Beijing Jiaotong University Business School University of Shanghai for Science and Technology Department of Control Science and Engineering Tongji University

This study introduces the emergence, research challenges,and future development of intelligent systems and big data(ISBD) and discusses the significance of ISBD to systems science. To this end, an overview of systems science is first presented, followed by the conclusion that the development of artificial intelligence(AI) has promoted the derivation and development of intelligent systems(ISs).

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Back on Track?

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China Weekly 2024年第5期 14-16页

作者： yu xiaodong 不详

China and Australia seek to stabilize bilateral relations amid growing skepticism over Canberra's dependence on Washington for its foreign and defense policies.

关键词： Track Australia bilateral

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A New Growth Paradigm

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China Weekly 2024年第4期 18-21页

作者： yu xiaodong 不详

China's new strategy of building up'new quality productive forces'looks to pursue new growth engines and upgrade the economy。On March 4 and 5,China kicked off its annual meetings of the National People's Congress(NPC),the legislature,and the National People's Political Consultative Conference(NPPCC),the country's top political advisory body,in Beijing.Known colloquially as the two sessions,the meetings are one of the most important events on China's political agenda.

关键词： political forces productive

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End of An Em

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China Weekly 2024年第1期 32-34页

作者： yu xiaodong 不详

Chinese officials and scholars bid farewell to Henry Kissinger and the bygone era of stable relations between China and the US that the famous strategist helped to build and sustain.

关键词： officials of stable

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