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Probing dark matter particles from evaporating primordial black holes via electron scattering in the CDEX-10 experiment

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Science China(Physics,Mechanics & Astronomy) 2024年第10期67卷 83-91页

作者： Zhenhua Zhang Litao Yang Qian Yue Kejun Kang Yuanjing Li Haipeng An Greeshma C. Jianping Chang Yunhua Chen Jianping Cheng Wenhan Dai Zhi Deng Changhao Fang Xinping Geng Hui Gong Qiuju Guo Tao Guo Xuyuan Guo Li he shengming he Jinwei Hu Hanxiong Huang Tuchen Huang Lin Jiang S.Karmakar Haubin Li Hanyu Li Jianmin Li Jin Li Qianyun Li Renmingjie Li Xueqian Li Yulan Li Yifan Liang Bin Liao FongKay Lin ShinTed Lin Jiaxuan Liu Shukui Liu Yandong Liu Yu Liu Yuanyuan Liu Hao Ma Yucai Mao Qiyuan Nie Jinhua Ning Hui Pan Ningchun Qi Jie Ren Xichao Ruan Monoj Kumar Singh Tianxi Sun Changjian Tang Yang Tian Guangfu Wang Junzheng Wang Li Wang Qing Wang Yufeng Wang Yunxiang Wang henry Tsz-King Wong Shiyong Wu Yucheng Wu Haoyang Xing Rui Xu Yin Xu Tao Xue Yulu Yan Nan Yi Chunxu Yu Haijun Yu Jianfeng Yue Ming Zeng Zhi Zeng Bingtao Zhang Fengshou Zhang Lei Zhang Zhenyu Zhang Jizhong Zhao Kangkang Zhao Minggang Zhao Jifang Zhou Zuying Zhou Jingjun Zhu CDEX Collaboration Key Laboratory of Particle and Radiation Imaging(Ministry of Education)and Department of Engineering Physics Tsinghua UniversityBeijing 100084China Department of Physics Tsinghua UniversityBeijing 100084China Institute of Physics Academia SinicaTaipei 11529China NUCTECH Company Beijing 100084China YaLong River Hydropower Development Company Chengdu 610051China College of Nuclear Science and Technology Beijing Normal UniversityBeijing 100875China College of Physics Sichuan UniversityChengdu 610065China School of Physics Peking UniversityBeijing 100871China Department of Nuclear Physics China Institute of Atomic EnergyBeijing 102413China Sino-French Institute of Nuclear and Technology Sun Yet-sen UniversityZhuhai 519082China School of Physics Nankai UniversityTianjin 300071China Department of Physics Banaras Hindu UniversityVaranasi 221005India Department of Physics Beijing Normal UniversityBeijing 100875China 不详

Dark matter(DM)is a major constituent of the ***,no definite evidence of DM particles(denoted as“χ”)has been found in DM direct detection(DD)experiments to *** is a novel concept of detectingχfrom evaporating primordial black holes(PBHs).We search forχemitted from PBHs by investigating their interaction with target *** examined PBH masses range from 1×10^(15)to 7×10^(16)g under the current limits of PBH abundance *** 205.4 kg·day data obtained from the CDEX-10 experiment conducted in the China Jinping Underground Laboratory,we exclude theχ-electron(χ-e)elastic-scattering cross sectionσ_(χe)~5×10^(-29)cm^(2)forχwith a mass■keV from our *** the higher radiation background but lower energy threshold(160 eV),CDEX-10 fills a part of the gap in the previous ***(m_(χ),σ_(χe))can be determined in the future,DD experiments are expected to impose strong constraints on fPBHfor large MPBHs.

关键词： CDEX primordial black hole light dark matter particle dark matter-electron scattering high purity germanium detector

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长短叶片转轮动静干涉引起的水力激振模态数值分析

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水电与抽水蓄能 2024年第1期10卷 7-11,37页

作者：管子武何胜明梁权伟康文喆张健曾杰王钊宁何启源东方电气集团东方电机有限公司四川省德阳市618000 雅砻江流域水电开发有限公司四川省成都市610000

本文以5个长叶片和5个短叶片转轮(活动导叶数为16)为例,通过数值计算,分析了长短叶片转轮的动静干涉引起的水力激振模态问题。结果表明,长短叶片转轮动静干涉引起的水力激振模态比较复杂。在无叶区,水力激振模态“节径”数为相应倍频数,... 详细信息

本文以5个长叶片和5个短叶片转轮(活动导叶数为16)为例,通过数值计算,分析了长短叶片转轮的动静干涉引起的水力激振模态问题。结果表明,长短叶片转轮动静干涉引起的水力激振模态比较复杂。在无叶区,水力激振模态“节径”数为相应倍频数,如5倍转频对应5“节径”等;在双叶栅区,激振力模态既有长(短)叶片数的特征(如15倍转频的模态的节径数为1),又有叶片总数的特征(如20倍转频的节径数为4,且模态旋转方向与转轮旋转方向相同)。本文的研究为长短叶片转轮的水泵水轮机的结构避振提供了新的方向。

关键词：水泵水轮机长短叶片转轮动静干涉水力激振模态数值计算

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水储联合调频系统模型及控制策略研究

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水力发电 2024年第4期50卷 66-74页

作者：何胜明丁仁山黄闻韬缪益平蹇德平邹皓雅砻江流域水电开发有限公司四川成都610051

对电池储能调频可行性进行了分析研究,构建了储能-水电多目标优化数学模型,提出了储能参与水电机组二次调频的多目标优化策略,经过仿真分析验证电池储能参与水电调频能够满足控制要求,给出了水储联合调频系统部署方式、运行方式、储能... 详细信息

对电池储能调频可行性进行了分析研究,构建了储能-水电多目标优化数学模型,提出了储能参与水电机组二次调频的多目标优化策略,经过仿真分析验证电池储能参与水电调频能够满足控制要求,给出了水储联合调频系统部署方式、运行方式、储能配置方案及预算,为大型水电站开展水储联合调频运行提供了理论技术支持,对同类型水储联合调频项目建设具有一定的借鉴作用。

关键词：水储联合调频二次调频系统模型控制策略

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Take Every Step Firmly with Sharp Eyes

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Chinese Journal of Chemistry 2024年第10期42卷 1065-1066页

作者： shengming Ma Chinese Journal of Chemistry

Chinese Journal of Chemistry(CJC)is committed to becoming a prominent international journal for chemistry and the related *** are working very hard towards this *** offers a diverse range of manuscript types,including... 详细信息

关键词： journal becoming diverse

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A gaseous time projection chamber with Micromegas readout for low-radioactive material screening

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Radiation Detection Technology and Methods 2023年第1期7卷 90-99页

作者： Haiyan Du Chengbo Du Ke Han shengming he Liqiang Liu Yue Meng Shaobo Wang Tao Zhang Wenming Zhang Li Zhao Jifang Zhou Shanghai Laboratory for Particle Physics and Cosmology Key Laboratory for Particle Astrophysics and Cosmology(MOE)School of Physics and AstronomyINPACShanghai Jiao Tong UniversityShanghai200240China Yalong River Hydropower Development Company Chengdu610051China SPEIT(SJTU-ParisTech Elite Institute of Technology) Shanghai Jiao Tong UniversityShanghai200240China

Purpose Low-radioactive material screening is becoming essential for rare event search experiments,such as neutrinoless double beta decay and dark matter searches in underground laboratories.A gaseous time projection chamber(TPC)can be used for such purposes with large active areas and high *** A gaseous TPC with a Micromegas readout plane of approximately 20×20 cm^(2)is successfully constructed for surface alpha contamination *** We have characterized the energy resolution,gain stability,and tracking capability with calibration *** With the unique track-related background suppression cuts of the gaseous TPC,we have established that the alpha background rate of the TPC is(0.13±0.03)×10^(−6)Bq/cm^(2),comparable to the leading commercial solutions.

关键词： Low background Gaseous time projection chamber Background suppression

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Relationships between Terrain Features and Forecasting Errors of Surface Wind Speeds in a Mesoscale Numerical Weather Prediction Model

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Advances in Atmospheric Sciences 2024年第6期41卷 1161-1170页

作者： Wenbo XUE Hui YU shengming TANG Wei HUANG Chinese Academy of Meteorological Sciences Beijing 100081China University of Chinese Academy of Sciences Beijing 101408China Shanghai Typhoon Institute/CMA Shanghai 200030China Key Laboratory of Numerical Modeling for Tropical Cyclone/CMA Shanghai 200030China

Numerical weather prediction(NWP)models have always presented large forecasting errors of surface wind speeds over regions with complex *** this study,surface wind forecasts from an operational NWP model,the SMS-WARR(Shanghai Meteorological Service-WRF ADAS Rapid Refresh System),are analyzed to quantitatively reveal the relationships between the forecasted surface wind speed errors and terrain features,with the intent of providing clues to better apply the NWP model to complex terrain *** terrain features are described by three parameters:the standard deviation of the model grid-scale orography,terrain height error of the model,and slope *** results show that the forecast bias has a unimodal distribution with a change in the standard deviation of *** minimum ME(the mean value of bias)is 1.2 m s^(-1) when the standard deviation is between 60 and 70 m.A positive correlation exists between bias and terrain height error,with the ME increasing by 10%−30%for every 200 m increase in terrain height *** ME decreases by 65.6%when slope angle increases from(0.5°−1.5°)to larger than 3.5°for uphill winds but increases by 35.4%when the absolute value of slope angle increases from(0.5°−1.5°)to(2.5°−3.5°)for downhill *** sensitivity experiments are carried out with a model output statistical(MOS)calibration model for surface wind speeds and ME(RMSE)has been reduced by 90%(30%)by introducing terrain parameters,demonstrating the value of this study.

关键词： surface wind speed terrain features error analysis MOS calibration model

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Pathological and physiological functional cross-talks ofα-synuclein and tau in the central nervous system

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Neural Regeneration Research 2024年第4期19卷 855-862页

作者： Mingyue Jin shengming Wang Xiaodie Gao Zhenyou Zou Shinji Hirotsune Liyuan Sun Guangxi Key Laboratory of Brain and Cognitive Neuroscience Guilin Medical University Department of Genetic Disease Research Osaka Metropolitan University Graduate School of Medicine Department of Scientific Research Brain Hospital of Guangxi Zhuang Autonomous Region

α-Synuclein and tau are abundant multifunctional brain proteins that are mainly expressed in the presynaptic and axonal compartments of neurons,*** works have revealed that intracellular deposition ofα-synuclein and/or tau causes many neurodegenerative disorders,including Alzheimer’s disease and Parkinson’s *** intense investigation,the normal physiological functions and roles ofα-synuclein and tau are still unclear,owing to the fact that mice with knockout of either of these proteins do not present apparent ***,the co-occurrence ofα-synuclein and tau aggregates was found in post-mortem brains with synucleinopathies and tauopathies,some of which share similarities in clinical ***,the direct interaction ofα-synuclein with tau is considered to promote the fibrillization of each of the proteins in vitro and in *** the other hand,our recent findings have revealed thatα-synuclein and tau are cooperatively involved in brain development in a stage-dependent *** findings indicate strong cross-talk between the two proteins in physiology and *** this review,we provide a summary of the recent findings on the functional roles ofα-synuclein and tau in the physiological conditions and pathogenesis of neurodegenerative diseases.A deep understanding of the interplay betweenα-synuclein and tau in physiological and pathological conditions might provide novel targets for clinical diagnosis and therapeutic strategies to treat neurodegenerative diseases.

关键词： alpha-synuclein microtubule-associated protein neurodegenerative disease tau

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Large eddy simulation of flow over a three-dimensional hill with different slope angles

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Frontiers of Earth Science 2024年第1期18卷 98-111页

作者： Liang LI Deqian ZheNG Guixiang CheN Pingzhi FANG Wenyong MA shengming TANG School of Civil Engineering Henan University of TechnologyZhengzhou 450001China henan International Joint Laboratory of Modern Green Ecological Storage System Zhengzhou 450001China henan Key Laboratory of Grain Storage Facility and Safety Zhengzhou 450001China Shanghai Typhoon Institute of China Meteorological Administration Shanghai 200030China Wind Engineering Research Center Shijiazhuang Tiedao UniversityShijiazhuang 050043China

Slope variation will significantly affect the characteristics of the wind field around a *** paper conducts a large-eddy simulation(LES)on an ideal 3D hill to study the impact of slope on wind field *** slopes ranging from 10°to 45°at 5°intervals are considered,which covers most conventional hill *** inflow turbulence for the LES is generated by adopting a modified generation method that combines the equilibrium boundary conditions with the Fluent inherent vortex method to improve the simulation *** time-averaged flow field and the instantaneous vortex structure under the eight slopes are comparatively *** accuracy of the present method is verified by comparison with experimental *** slope can affect both the mean and fluctuating wind flow fields around the 3D hill,especially on the hilltop and the leeward side,where a critical slope of 25°can be *** fluctuating wind speeds at the tops of steep hills(with slope angles beyond 25°)decrease with increasing slope,while the opposite phenomenon occurs on gentle *** increasing slope,the energy of the high-speed descending airflow is enhanced and pushes the separated flow closer to the hill surface,resulting in increased wind speed near the wall boundary on the leeward side and inhibiting the development of *** vortex shedding trajectory in the wake region becomes wider and longer,suppressing the growth of the mean wind near the wall boundary and enhancing the turbulence intensity.

关键词： large eddy simulation inflow turbulence topographic wind field critical slope flow mechanism

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锦屏水力发电厂“一厂两站”运行管理模式及实践

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人民长江 2017年第2期48卷 65-67,70页

作者：何胜明何能全雅砻江流域水电开发有限公司锦屏水力发电厂四川西昌615000

锦屏水力发电厂按照"一厂两站"的模式对锦屏一、二级两座水电站进行运行管理,这种运行管理模式在国内、国际特大型水电厂中尚属首创。经过几年的探索,锦屏水力发电厂在队伍建设、运行管理、检修维护、成本控制以及文化建设等方面进行了... 详细信息

锦屏水力发电厂按照"一厂两站"的模式对锦屏一、二级两座水电站进行运行管理,这种运行管理模式在国内、国际特大型水电厂中尚属首创。经过几年的探索,锦屏水力发电厂在队伍建设、运行管理、检修维护、成本控制以及文化建设等方面进行了大胆的创新和实践,积累了一些切实可行的经验。对电站的基本情况、"一厂两站"运行管理的创新实践及其实施过程中应当遵循的体系和采取的措施等方面作了简单介绍,其经验可对其他类似电厂的运行管理提供一定的借鉴与参考。

关键词：管理创新管理模式一厂两站锦屏水力发电厂

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Multiscale interaction analysis of Landfall Typhoon Lekima (2019) based on vorticity equation diagnosis

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TROPICAL CYCLONE RESEARCH AND REVIEW 2024年第2期13卷 136-146页

作者： Xue, Wenbo Yu, Hui Tang, shengming Chinese Acad Meteorol Sci Beijing Peoples R China Univ Chinese Acad Sci Beijing Peoples R China Shanghai Typhoon Inst China Meteorol Adm Shanghai Peoples R China

To investigate the multiscale interaction characteristics of Landfall Typhoon Lekima (2019), this study analyzed the characteristics of the different scale vortex structure and interactions among different scales based on vorticity equation diagnosis. The analysis is based on the simulation results of the WRF model which has been thoroughly verified. The main results are as follows: the original vorticity dominated by the meso-alpha scale vorticity increases with height and then decreases, with maximum vorticity distributed at 900 hPa. The meso-beta scale vorticity varies significantly with altitude, while the meso-gamma scale vorticity field exhibits obvious positive vorticity below 850 hPa. The meso-alpha scale vorticity tendency primarily maintains negative, contributing significantly to the overall reduction in the original vorticity field over time. The increase in mid-to-upper-level (above 550 hPa) original vorticity is mainly related to the variations in the meso-beta and meso-gamma scale vorticity fields. The original vorticity dominated by the meso-alpha scale vorticity increases with height and then decreases, and the whole layer vorticity decreases over time. The meso-beta scale vorticity varies significantly with altitude and time, while the meso-gamma scale vorticity field consistently exhibits significant positive vorticity below 850 hPa. The vorticity equation diagnosis revealed that the primary source terms of the vorticity tendencies are the twisting and stretching terms, and the main sink terms being horizontal and vertical vorticity transport terms below 900 hPa. The source terms and sink terms exchange above 850 hPa. Scale separation results show that the primary contributions of all impact factors originate from the meso-alpha and meso-gamma scale fields (accounting for over 80% of the total), with the contribution of the meso-alpha scale being less than that of the meso-gamma scale and a notable contribution over 35.5% of the interactions betwe

关键词： Tropical cyclone Multiscale interaction Vorticity equation diagnosis TROPICAL CYCLONES TOPOGRAPHY

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