检索结果-南通市图书馆

Comparison of Adaptive Simulation Observation Experiments of the heavy Rainfall in South China and Sichuan Basin

Advances in Atmospheric Sciences 2024年第11期41卷 2173-2191页

作者： linbin he Weiyi PENG Yu ZHANG Shiguang MIAO Siqi CheN Jiajing LI Duanzhou SHAO Xutao ZHANG College of Ocean and Meteorology Guangdong Ocean UniversityZhanjiang 524088China Chinese Academy of Meteorology Sciences Beijing 100081China Institute of Urban Meteorology China Meteorological AdministrationBeijing 100089China School of Marine Sciences Nanjing University of Information Science and TechnologyNanjing 210044China Dalian Marine Center Ministry of Nature Resources of the People's Republic of ChinaDalian 116001China

This study examines the effectiveness of adaptive observation experiments using the ensemble transformation sensitivity(ETS) method to improve precipitation forecasts during heavy rainfall events in South China and the Sichuan Basin. High-resolution numerical models are employed to simulate adaptive observations. By identifying the sensitive areas of key weather system positions 42 hours before heavy rainfall events, the adaptive observations improve the prediction of jet streams, strong winds, and shear lines, which are essential for accurate heavy rainfall forecasting. This improvement is reflected in both the precipitation structure and location accuracy within the verification region. In South China, targeted observations enhance rainfall predictions by improving water vapor transport. In the Sichuan Basin, adaptive observations refine water vapor transport and adjust vortex dynamics. This research highlights the importance of accurately predicting shear lines and jet streams for forecasting heavy rainfall in these areas. Overall, this study found that adaptive observation enhances the precipitation forecast skills of the structure and location for heavy rainfall in South China and the Sichuan Basin, emphasizing their potential utility in operational numerical weather prediction.

关键词： adaptive observation ensemble transform sensitivity data assimilation rainfall

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

变形Zn-2Al合金的热处理硬化行为研究

引用

特种铸造及有色合金 2010年第12期30卷 1168-1170页

作者：孙文声张锦麟何林斌谢先娇谢全文张明宁波博威合金材料股份有限公司研发中心

采用X射线衍射、金相分析等方法,对铸造态、挤压态和热处理态的Zn-2Al合金组织结构及演化规律进行了分析。结合硬度(HV)的测量,发现了变形Zn-2Al合金中存在的加工软化,热处理硬化现象。提出了受力过程中晶粒转动机制是决定Zn-2Al合金变... 详细信息

采用X射线衍射、金相分析等方法,对铸造态、挤压态和热处理态的Zn-2Al合金组织结构及演化规律进行了分析。结合硬度(HV)的测量,发现了变形Zn-2Al合金中存在的加工软化,热处理硬化现象。提出了受力过程中晶粒转动机制是决定Zn-2Al合金变形机理的主要决定因素。

关键词： Zn-2Al合金热处理硬化

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

基于Mahony滤波和EKF融合的姿态解算方法

引用

传感器与微系统 2023年第12期42卷 160-163,168页

作者：朱鹏陈威平石颖何林彬谢文武余超湖南理工学院信息科学与工程学院湖南岳阳414006

随着微机电系统(MEMS)的发展,基于惯性测量单元(IMU)的捷联式惯性导航系统(SINS)成为了行人导航的理想选择。针对SINS定位精度低、器件噪声大的问题,提出一种改进的Mahony滤波器和扩展卡尔曼滤波(EKF)相结合的姿态解算算法。首先,该算... 详细信息

随着微机电系统(MEMS)的发展,基于惯性测量单元(IMU)的捷联式惯性导航系统(SINS)成为了行人导航的理想选择。针对SINS定位精度低、器件噪声大的问题,提出一种改进的Mahony滤波器和扩展卡尔曼滤波(EKF)相结合的姿态解算算法。首先,该算法基于SINS误差量建立模型;再以Mahony滤波加速度与捷联惯导姿态解算加速度之差作为系统的观测量;最后,应用EKF融合陀螺仪、加速度计的测量数据得到定位结果。实验结果表明,在不同的运动状态下,与EKF和Mahony滤波器相比,平均定位误差分别降低了73.27%和65.76%以上,该融合算法能有效估计行人姿态,减少航向漂移,提高定位精度。

关键词： Mahony滤波姿态估计扩展卡尔曼滤波数据融合惯性导航

来源：

维普期刊数据库博看期刊

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

基于USRP的Link11A数据链仿真研究

引用

电子技术（上海） 2023年第1期52卷 19-21页

作者：朱鹏何林彬彭思瑾鲁娆彭鑫谢文武湖南理工学院信息科学与工程学院湖南414006

阐述数据链系统的仿真,发射端可以根据Link11A数据链的既有协议进行信号生成,对于接收端的定时同步和频偏估计等关键技术存在着多种方案。探讨Schmidl&Cox定时同步算法,提出了一种适用于Link11A的定时同步算法,给出了接收端信号处理方... 详细信息

阐述数据链系统的仿真,发射端可以根据Link11A数据链的既有协议进行信号生成,对于接收端的定时同步和频偏估计等关键技术存在着多种方案。探讨Schmidl&Cox定时同步算法,提出了一种适用于Link11A的定时同步算法,给出了接收端信号处理方案。使用GNU Radio和USRP结合的软件无线电技术对数据链系统进行方案验证。实验结果证明信号处理方案和验证方法的可行性。

关键词：软件无线电 Link11A 定时同步

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Influence of mesoscale eddies on primary production in the South China Sea during spring inter-monsoon period

引用

Acta Oceanologica Sinica 2014年第3期33卷 118-128页

作者： HU Zifeng TAN Yehui SONG Xingyu ZHOU linbin LIAN Xiping HUANG Liangmin he Yinghui Key Laboratory of Marine Bio-resources Sustainable Utilization (LMB) South China Sea Institute of Oceanology Chinese Academy of Sciences University of Chinese Academy of Sciences Marine Biology Research Station at Daya Bay Chinese Academy of Science State Key Laboratory of Tropical Oceanology (LTO) South China Sea Institute of Oceanology ChineseAcademy of Sciences

Mesoscale eddies have been suggested to have an impact on biological carbon fixation in the South China Sea （SCS）. However, their overall contribution to primary production during the spring inter-monsoon pe riod is still unknown. Based on large-scale biological and environmental in situ observations and synchro nous remote sensing data, the distribution patterns of phytoplankton biomass and the primary production, and the role of mesoscale eddies in regulating primary production in different eddy-controlled waters were investigated. The results suggested that the surface chlorophyll a concentrations and water column inte grated primary production （IPP） are significantly higher in cyclonic eddies and lower in the anticyclonic eddies as compared to that in non-eddy waters. Although eddies could affect various environmental factors, such as nutrients, temperature and light availability, nutrient supply is suggested to be the most important one through which mesoscale eddies regulated the distribution patterns of phytoplankton biomass and pri mary production. The estimated IPP in cyclonic and anticyclonic eddies are about 29.5% higher and 16.6% lower than the total average in the whole study area, respectively, indicating that the promotion effect of mesoscale cold eddies on the primary production was much stronger than the inhibition effect of the warm eddies per unit area. Overall, mesoscale eddies are crucial physical processes that affect the biological car bon fixation and the distribution pattern of primary production in the SCS open sea, especially during the spring inter-monsoon period.

关键词： mesoscale eddies chlorophyll a primary production vertically generalized production model,remote sensing South China Sea

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

毛竹-桫椤群丛的种间关系与群落稳定性

引用

热带亚热带植物学报 2024年第3期32卷 349-356页

作者：杨熳袁冬梅严令斌喻理飞安明态何琴琴穆君贵州大学生命科学学院农业生物工程研究院山地植物资源保护与种质创新教育部重点实验室贵阳550025 贵州大学林学院贵阳550025 赤水桫椤国家级自然保护区管理局贵州赤水5647000

种间关系是植物群落重要的数量与结构特征之一,直接影响群落的稳定性,探究种间关系与群落稳定性对于植物种群的保护和稳定性维持具有重要意义。以贵州省赤水桫椤国家级自然保护区内的桫椤群落为研究对象,采用样方法对桫椤(Alsophila spi... 详细信息

种间关系是植物群落重要的数量与结构特征之一,直接影响群落的稳定性,探究种间关系与群落稳定性对于植物种群的保护和稳定性维持具有重要意义。以贵州省赤水桫椤国家级自然保护区内的桫椤群落为研究对象,采用样方法对桫椤(Alsophila spinulosa)群落进行调查,分析植物总体关联性、种间相关性并计算群落的稳定性系数。结果表明,毛竹(Phyllostachys edulis)在群落中占绝对优势,毛竹与桫椤的种间关系表现为显著正相关;桫椤在发育前期受到物种间的影响较大,而在发育的后期处于相对独立的状态,与物种间的关系表现为弱相关或不相关,受到物种间的影响较小;贡献定律法分析表明毛竹-桫椤群落的稳定性系数为21/79,说明金沙沟区域的毛竹-桫椤群落处于稳定状态。

关键词：毛竹-桫椤群丛种间关系群落稳定性

来源：

维普期刊数据库

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Detecting micro-blog user interest communities through the integration of explicit user relationship and implicit topic relations

引用

Science China(Information Sciences) 2017年第9期60卷 64-77页

作者： Yu QIN Zhengtao YU Yanbing WANG Shengxiang GAO linbin SHI Institute of Information Engineering and Automation Kunming University of Science and Technology Key Laboratory of Intelligent Information Processing Kunming University of Science and Technology

In order to effectively utilize the explicit user relationship and implicit topic relations for the detection of micro-blog user interest communities, a micro-blog user interest community(MUIC) detection approach is proposed. First, through the analysis of the follow relationship between users, we have defined three types of such relationships to construct the user follow-ship network. Second, taking the semantic correlation between user tags into account, we construct the user interest feature vectors based on the concept of feature mapping to build a user tag based interest relationship network. Third, user behaviors, such as reposting, commenting, replying, and receiving comments from others, are able to provide certain guidance for the extraction of micro-blog topics. hence, we propose to integrate the four mentioned user behaviors that are considered to provide guidance information for the traditional latent Dirichlet allocation(LDA) model. Thereby, in addition to the construction of a topic-based interest relationship network, a guided topic model can be built to extract the topics in which the user is interested. Finally, with the integration of the afore-mentioned three types of relationship network, a micro-blog user interest relationship network can be created. Meanwhile, we propose a MUIC detection algorithm based on the contribution of the neighboring nodes. The experiment result proves the effectiveness of our approach in detecting MUICs.

关键词： feature mapping implicit topic guided topic model contribution of the neighboring nodes

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Review Expert Collaborative Recommendation Algorithm Based on Topic Relationship

引用

IEEE/CAA Journal of Automatica Sinica 2015年第4期2卷 403-411页

作者： Shengxiang Gao Zhengtao Yu linbin Shi Xin Yan Haixia Song School of Information Engineering and Automation and Key Laboratory of Intelligent Information Processing Kunming University of Science and Technology

The project review information plays an important role in the recommendation of review experts. In this paper, we aim to determine review expert's rating by using the historical rating records and the final decision results on the previous projects, and by means of some rules, we construct a rating matrix for projects and experts. For the data sparseness problem of the rating matrix and the 'cold start' problem of new expert recommendation, we assume that those projects/experts with similar topics have similar feature vectors and propose a review expert collaborative recommendation algorithm based on topic relationship. Firstly, we obtain topics of projects/experts based on latent Dirichlet allocation (LDA) model, and build the topic relationship network of projects/experts. Then, through the topic relationship between projects/experts, we find a neighbor collection which shares the largest similarity with target project/expert, and integrate the collection into the collaborative filtering recommendation algorithm based on matrix factorization. Finally, by learning the rating matrix to get feature vectors of the projects and experts, we can predict the ratings that a target project will give candidate review experts, and thus achieve the review expert recommendation. Experiments on real data set show that the proposed method could predict the review expert rating more effectively, and improve the recommendation effect of review experts. © 2014 Chinese Association of Automation.

关键词： Algorithms Collaborative filtering Factorization Rating Statistics

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

南宁市输血依赖性地中海贫血(TDT)患者血液保障及“以供定采”管理分析

引用

中国输血杂志 2024年第5期37卷 567-574页

作者：余梅陈洋李贤莫秋红黄林宾闫锡鹏何保仁李彬陈利民南宁中心血站广西南宁530007 南宁市第四人民医院南宁市卫生健康人才与技术服务中心中国医学科学院北京协和医学院输血研究所

目的回顾性统计分析南宁市户籍输血依赖性地中海贫血(transfusion-dependent thalassemia, TDT)患者2018-2023年在9家定点输血医疗机构用血情况,评估“三定”输血模式及“以供定采”血液管理模式对TDT患者的血液保障效果。方法实施定... 详细信息

目的回顾性统计分析南宁市户籍输血依赖性地中海贫血(transfusion-dependent thalassemia, TDT)患者2018-2023年在9家定点输血医疗机构用血情况,评估“三定”输血模式及“以供定采”血液管理模式对TDT患者的血液保障效果。方法实施定点、定人、定时的“三定”输血模式,确保本地户籍登记在册(简称“名册”)TDT患者获得定点医疗机构门诊输血权益及血液保障。实施“以供定采”血液管理模式对“名册”TDT患者用血需求做精细化评估,并依据血液库存量(采集)最大限度予以满足。结果 2018-2023年“名册”TDT患者合计供血占所有医疗机构供应红细胞总供血量10.37%(138 509.5 U/1 335 788.0 U);其中O型血占比最高为46.34%(64 181.0 U/138 509.5 U),AB型血占比最低为3.85%(5 331.0 U/138 509.5 U)。2018年已经设立9家TDT患者定点输血医疗机构,“名册”TDT患者合计766人,人均年输血量由2018年的20.28 U(15 531.0 U/766人)提升至2023年的36.01 U(27 586.0 U/766人),每年同比均保持正增长(+30.26%,+4.94%,+11.71%,+8.61%,+7.10%)。结论实行“三定”输血模式及“以供定采”血液管理模式能有效保障TDT患者血液供应。

关键词：输血依赖性地中海贫血(TDT) 血液保障 “三定”输血模式 “以供定采”血液管理模式南宁

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Frequency Support from PMSG-Based Wind Turbines with Reduced DC-Link Voltage Fluctuations

引用

CES Transactions on Electrical Machines and Systems 2018年第3期2卷 296-302页

作者： Jiafa he linbin Huang Di Wu Chengzhi Zhu Huanhai Xin College of Electrical Engineering Zhejiang UniversityHangzhou 310027China State Grid Zhejiang Electric Power Co.LTDHangzhou 310014China Department of Electrical and Computer Engineering North Dakota State UniversityFargo 58102USA

Frequency droop control is widely used in permanent magnet synchronous generators(PMSGs)based wind turbines(WTs)for grid frequency ***,under frequency deviations,significant DC-link voltage fluctuations may occur during the transient process due to sudden changes in real power of such *** address this issue,a current feedforward control strategy is proposed for PMSG-based WTs to reduce DC-link voltage fluctuations when the WTs are providing frequency support under grid frequency ***,the desired frequency support capability of the PMSG-based WTs can be *** results verify the rationality of the analysis and the effectiveness of the proposed control method.

关键词： Current feed forward control DC-link voltage frequency droop control frequency support PMSG-based WTs

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：