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Recognition of Organizational Morphology of Mesoscale Convective Systems Using Himawari-8 Observations

Journal of Tropical Meteorology 2024年第3期30卷 289-305页

作者： shou yi-xuan ZHANG Su-zhao LU Feng Key Laboratory of Radiometric Calibration and Validation for Environmental Satellites National Satellite Meteorological Center(National Center for Space Weather)China Meteorological AdministrationBeijing 100081 China Innovation Center for FengYun Meteorological Satellite(FYSIC) Beijing 100081 China Key Laboratory for Meteorological Disaster Monitoring and Early Warning and Risk Management of Characteristic Agriculture in Arid Regions Yinchuan 750002 China Ningxia Key Laboratory of Meteorological Disaster Prevention and Mitigation Yinchuan 750002 China

The onset,evolution,and propagation processes of convective cells can be reflected by the organizational morphology of mesoscale convective systems(MCSs),which are key factors in determining the potential for heavy *** paper proposed a method for objectively classifying and segmenting MCSs using geosynchronous satellite *** of the product relative to the classification in radar composite reflectivity imagery indicates that the algorithm offers skill for discriminating between convective and stratiform areas and matched 65%of convective area identifications in radar imagery with a false alarm rate of 39%and an accuracy of 94%.A quantitative evaluation of the similarity between the structures of 50 MCSs randomly obtained from satellite and radar observations shows that the similarity was as high as 60%.For further testing,the organizational modes of the MCS that caused the heavy precipitation in Northwest China on August 21,2016(hereinafter known as the“0821”rainstorm)were *** was found that the MCS,accompanied by the“0821”rainstorm,successively exhibited modes of the isolated cell,squall line with parallel stratiform(PS)rain,and non-linear system during its life *** them,the PS mode might have played a key role in causing this *** findings are in line with previous studies.

关键词： mesoscale convective system satellite organizational morphology extremely heavy precipitation

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A novel method for simultaneous measurement of^(222)Rn and^(220)Rn progeny concentrations measured by an alpha spectrometer

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Nuclear Science and Techniques 2025年第1期36卷 127-139页

作者： Zhong-Kai Fan Jia-Le Sun Hao-xuan Li Xiang-Ming Cai Hui Yang shou-Kang Qiu Yan-Liang Tan Jian Shan School of Nuclear Science and Technology University of South ChinaHengyang 421001China College of Physics and Electronic Engineering Hengyang Normal UniversityHengyang 421008China

The accumulation of^(222)Rn and^(220)Rn progeny in poorly ventilated environments poses the risk of natural radiation exposure to the public.A previous study indicated that satisfactory results in determining the^(222)Rn and^(220)Rn progeny concentrations by measuring the total alpha counts at five time intervals within 560 min should be expected only in the case of high progeny concentrations in *** complete the measurement within a relatively short period and adapt it for simultaneous measurements at comparatively lower^(222)Rn and^(220)Rn progeny concentrations,a novel mathematical model was proposed based on the radioactive decay *** model employs a nonlinear fitting method to distinguish nuclides with overlapping spectra by utilizing the alpha particle counts of non-overlapping spectra within consecutive measurement cycles to obtain the concentrations of^(222)Rn and^(220)Rn progeny in *** verification experiments were conducted using an alpha *** experimental results demonstrate that the concentrations of^(222)Rn and^(220)Rn progeny calculated by the new method align more closely with the actual circumstances than those calculated by the total count method,and their relative uncertainties are all within±16%.Furthermore,the measurement time was reduced to 90 min,representing an acceleration of 84%.The improved capability of the new method in distinguishing alpha particles with similar energies emitted from ^(218)Po and^(212)Bi,both approximately 6 MeV,contributed to realizing more accurate *** proposed method has the potential advantage of measuring relatively low concentrations of^(222)Rn and^(220)Rn progeny in air more quickly via air filtration.

关键词： ^(222)Rn ^(220)Rn Progeny concentration Nonlinear fitting method Alpha spectrometer

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我国螺旋度的研究及应用

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高原气象 2006年第4期25卷 754-762页

作者：岳彩军寿亦萱寿绍文漆梁波施红中国气象局上海台风研究所南京信息工程大学大气科学系江苏南京210044 上海中心气象台上海200030 上海浦东新区气象中心上海200135

对自20世纪90年代以来至今国内关于螺旋度理论及应用研究工作进行了较系统地总结,将螺旋度归类为垂直螺旋度、水平螺旋度及完全螺旋度,同时又将垂直螺旋度划分为局地垂直螺旋度和积分垂直螺旋度,详细介绍并给出了每一类螺旋度的计算表... 详细信息

对自20世纪90年代以来至今国内关于螺旋度理论及应用研究工作进行了较系统地总结,将螺旋度归类为垂直螺旋度、水平螺旋度及完全螺旋度,同时又将垂直螺旋度划分为局地垂直螺旋度和积分垂直螺旋度,详细介绍并给出了每一类螺旋度的计算表达式以及其在天气诊断分析中的应用状况,对螺旋度的应用研究现状进行了简单地分析与讨论,最后展望了未来螺旋度研究与应用的发展方向。

关键词：螺旋度垂直螺旋度水平螺旋度完全螺旋度研究及应用

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各非地转Q矢量之间的定量比较

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高原气象 2008年第3期27卷 608-618页

作者：岳彩军寿亦萱寿绍文曾刚王咏青中国气象局上海台风研究所上海200030 南京信息工程大学大气科学学院江苏南京210044 江苏省气象灾害重点实验室(南京信息工程大学) 江苏南京210044

结合“海棠”台风在2005年7月19日08：00～20日08：00再次登陆福建省24h期间所造成的降水过程，在WRF模式成功地模拟了此次降水过程的基础上，利用模式模拟输出结果，通过计算900～600hPaQ矢量散度的气柱平均值、Q矢量散度强迫产生的降... 详细信息

结合“海棠”台风在2005年7月19日08：00～20日08：00再次登陆福建省24h期间所造成的降水过程，在WRF模式成功地模拟了此次降水过程的基础上，利用模式模拟输出结果，通过计算900～600hPaQ矢量散度的气柱平均值、Q矢量散度强迫产生的降水场，定量比较分析了非地转干Q矢量、非地转湿Q矢量及改进的湿Q矢量的诊断能力差异，结果表明：（1）非地转干Q矢量、非地转湿Q矢量及改进的湿Q矢量散度辐合场，对同期模拟雨区都具有一定指示作用，同时，非地转湿Q矢量和改进的湿Q矢量的散度辐合强度都较非地转干Q矢量散度辐合强度强，且改进的湿Q矢量散度辐合强度强于非地转湿Q矢量散度辐合强度，尤其是在主雨区表现的更为明显。相对来讲，改进的湿Q矢量散度辐合场对雨区的反映能力最强。（2）非地转湿Q矢量散度与改进的湿Q矢量散度强迫产生的降水范围几乎相同，且明显较非地转干Q矢量散度强迫产生的雨区范围大，相对来讲，与同期模拟降水场的雨区更接近。改进的湿Q矢量散度强迫产生的降水强度最强，非地转湿Q矢量散度强迫次之，非地转干Q矢量散度强迫产生的降水强度最弱。三种Q矢量散度强迫产生的降水强度都明显弱于同期模式模拟的降水强度，相对来讲，改进的湿Q矢量散度强迫产生的降水强度更接近于模拟的降水强度。（3）三种Q矢量散度场以及强迫产生的降水场之间的差异，充分表明此次台风降水过程中伴有大量的大尺度稳定水汽凝结潜热和对流水汽凝结潜热释放，考虑了水汽凝结潜热加热作用的非地转湿Q矢量与改进的湿Q矢量，对降水反映能力均较非地转干Q矢量有所改进，尤其是后者。

关键词：非地转干Q矢量改进的非地转湿Q矢量 Q矢量散度 Q矢量散度强迫产生的降水量

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中国Q矢量分析方法的应用与研究

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高原气象 2005年第3期24卷 450-455页

作者：岳彩军寿亦萱姚秀萍寿绍文漆梁波施红上海台风研究所上海200030 南京信息工程大学大气科学系江苏南京210044 中国气象局培训中心北京100081 上海中心气象台上海200030 上海浦东新区气象中心上海200135

对自20世纪80年代以来国内关于Q矢量分析方法的应用及研究工作进行了较系统的总结,也具体给出了每一种Q矢量的计算表达式及以其散度场作为强迫项的ω方程的计算表达式,对每一种Q矢量分析方法的特点给予了简单介绍和说明,最后也提出了对... 详细信息

对自20世纪80年代以来国内关于Q矢量分析方法的应用及研究工作进行了较系统的总结,也具体给出了每一种Q矢量的计算表达式及以其散度场作为强迫项的ω方程的计算表达式,对每一种Q矢量分析方法的特点给予了简单介绍和说明,最后也提出了对未来Q矢量分析方法应用与研究的设想。

关键词： Q矢量 Q矢量分析方法应用与研究

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暴雨过程的卫星云图纹理特征研究

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南京气象学院学报 2005年第3期28卷 337-343页

作者：寿亦萱张颖超赵忠明励申申寿绍文南京信息工程大学信息与通信系江苏南京210044 中国科学院遥感应用研究所北京100101 南京信息工程大学大气科学系江苏南京210044

针对卫星云图上云团所具有的半流体特性,应用纹理特征分析法对其进行定量研究。首先用灰度共生矩阵统计法提取100个样本云团的纹理特征参数,然后应用Mahalanobis距离作相似性测度进行聚类分析,提取出4类云以及无云区的具有旋转不变性的... 详细信息

针对卫星云图上云团所具有的半流体特性,应用纹理特征分析法对其进行定量研究。首先用灰度共生矩阵统计法提取100个样本云团的纹理特征参数,然后应用Mahalanobis距离作相似性测度进行聚类分析,提取出4类云以及无云区的具有旋转不变性的纹理特征参数。在此基础上分析了2003年7月4—5日江淮流域发生特大暴雨地区云团的纹理特征参数的变化规律与降水过程之间的对应关系。从实际的降水资料和纹理特征参数变化的回归分析结果来看,纹理特征参数的变化规律与降水量之间有较好的对应关系。这些结果不仅对中短期天气过程的诊断分析而且对数值预报都具有一定的实用意义。

关键词：灰度共生矩阵卫星云图纹理分析特征提取回归分析

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Satellite-based Observational Study of the Tibetan Plateau Vortex:Features of Deep Convective Cloud Tops

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Advances in Atmospheric Sciences 2019年第2期36卷 189-205,248页

作者： yi-xuan shou Feng LU Hui LIU Peng CUI Shaowen shou Jian LIU Key Laboratory of Radiometric Calibration and Validation for Environmental Satellites China Meteorological Administration(LRCVES/CMA) National Satellite Meteorological Center Key Laboratory of Meteorological Disasters Nanjing University of Information Sciences and Technology

In this study, an east-moving Tibetan Plateau vortex(TPV) is analyzed by using the ERA-5 reanalysis and multi-source satellite data, including FengYun-2 E, Aqua/MODIS and CALIPSO. The objective is to demonstrate:(i) the usefulness of multi-spectral satellite observations in understanding the evolution of a TPV and the associated rainfall, and(ii) the potential significance of cloud-top quantitative information in improving Southwest China weather forecasts. Results in this study show that the heavy rainfall is caused by the coupling of an east-moving TPV and some low-level weather systems [a Plateau shear line and a Southwest Vortex(SWV)], wherein the TPV is a key component. During the TPV's life cycle, the rainfall and vortex intensity maintain a significant positive correlation with the convective cloud-top fraction and height within a 2.5?radius away from its center. Moreover, its growth is found to be quite sensitive to the cloud phases and particle sizes. In the mature stage when the TPV is coupled with an SWV, an increase of small ice crystal particles and appearance of ring-and U/V-shaped cold cloud-top structures can be seen as the signature of a stronger convection and rainfall enhancement within the TPV. A tropopause folding caused by ageostrophic flows at the upper level may be a key factor in the formation of ring-shaped and U/V-shaped cloud-top structures. Based on these results, we believe that the supplementary quantitative information of an east-moving TPV cloud top collected by multi-spectral satellite observations could help to improve Southwest China short-range/nowcasting weather forecasts.

关键词： Tibetan Plateau vortex multi-spectral satellite observations short-range/nowcasting weather forecasts cold U/V-shaped cloud top tropopause folding

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Highly coupled off-resonance lattice design in diffraction-limited light sources

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Nuclear Science and Techniques 2024年第9期35卷 92-102页

作者： yi-Hao Gong Shun-Qiang Tian Xin-Zhong Liu shou-Zhi xuan Li-Yuan Tan Ling-Long Mao Shanghai Advanced Research Institute Chinese Academy of Sciences Shanghai 201204 ShanghaiChina Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201800 ShanghaiChina University of Chinese Academy of Sciences 100049 BeijingChina

The round-beam operation presents many benefits for scientific experiments regarding synchrotron radiation and the weak-ening influences of intra-beam scattering in diffraction-limited synchrotron light sources.A round-beam generation method based on the global setting of skew quadrupoles and the application of a non-dominated sorting genetic algorithm was pro-posed in this *** schemes,including large-emittance coupling introduced via betatron coupling and vertical disper-sion,were explored in a candidate lattice for an upgrade-proposal of the Shanghai synchrotron radiation *** variations with lattice imperfections and their influence on the beam dynamics of beam optic distortions were *** results demonstrated that a precise coupling control ranging from 10 to 100%was achieved under low optical distortion,whereas full-coupling generation and its robustness were achieved by our proposed method by adjusting the skew quadrupole components located in the dispersion-free *** Touschek lifetime increased by a factor of 2–2.5.

关键词： Diffraction-limited storage ring(DLSR) Shanghai synchrotron radiation facility upgrade(SSRF-U) Round beam Off-resonance coupling

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Correction:A novel method for simultaneous measurement of ^(222)Rn and ^(220)Rn progeny concentrations measured by an alpha spectrometer

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Nuclear Science and Techniques 2025年第2期36卷 157-157页

Correction to:Nuclear Science and Techniques(2024)36:8 https://***/10.1007/s41365-024-01570-7 In this article the affiliation details for Author Jian Shan were incorrectly given as‘College of Physics and Electronic Engi-neering,Hengyang Normal University,Hengyang 421008,China’but should have been‘School of Nuclear Science and Technology,University of South China,Hengyang 421001,China’.The original article has been corrected.

关键词： details simultaneous corrected

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Comparative Study of the Magnetic Properties and Glass-Forming Ability of Fe-Based Bulk Metallic Glass with Minor Mn, Co, Ni, and Cu Additions

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Acta Metallurgica Sinica(English Letters) 2016年第9期29卷 834-839页

作者： Md Anisur Rahman Yun-Zhuo Lu Qiang Luo shou-Jiang Qu Feng-Xia Ye yi-xuan Wu Jun Shen School of Materials Science and Engineering Tongji University School of Materials Science and Engineering Dalian Jiaotong University

Fe43MsCra5Mo14C15B6Y2 （M = Mn, Co, Ni, and Cu in at.%） bulk metallic glasses （BMGs） are synthesized using the suction casting technique, and the glass-forming ability （GFA）, microstructure, and thermal and magnetic properties of these glasses are extensively examined using X-ray diffraction, differential scanning calorimeter, and vibrating sample magnetometer techniques. Among the four BMG alloys, Fe43NisCr15Mo14C15B6Y2 exhibits the lowest coercivity and the highest saturation magnetization, Curie temperature, effective magnetic moment, and GFA. By contrast, Fe43MnsCrlsMo14C15B6Y2 presents the poorest magnetic properties, such as the highest coercivity and the lowest saturation magnetization, Curie temperature, and effective magnetic moment. Fe43Cu5Cr15MolaC15B6Y2 demonstrates the lowest thermal stability and GFA. The observed thermal, structural, and magnetic properties of these BMG alloys are discussed in terms of the kinetics of BMG synthesization and the formation of different ferromagnetic, ferrimagnetic, and antiferromagnetic phases.

关键词： Bulk metallic glasses Saturation magnetization Effective magnetic moment Coercivity Glass-forming ability

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