检索结果-南通市图书馆

A Physics-informed Deep-learning Intensity Prediction Scheme for Tropical Cyclones over the Western North Pacific

Advances in Atmospheric Sciences 2024年第7期41卷 1391-1402页

作者： Yitian ZHOU Ruifen ZHAN Yuqing WANG peiyan chen Zhemin TAN Zhipeng XIE Xiuwen NIE Department of Atmospheric and Oceanic Sciences&Institute of Atmospheric Sciences Fudan UniversityShanghai 200438China Shanghai Typhoon Institute of China Meteorological Administration Shanghai 200030China Department of Atmospheric Sciences and International Pacific Research Center University of Hawaii at ManoaHonolulu 96822USA Key Laboratory of Mesoscale Severe Weather/MOE and School of the Atmospheric SciencesNanjing UniversityNanjing 210023China School of Computer Science Fudan UniversityShanghai 200438China

Accurate prediction of tropical cyclone(TC)intensity is challenging due to the complex physical processes ***,we introduce a new TC intensity prediction scheme for the western North Pacific(WNP)based on a time-dependent theory of TC intensification,termed the energetically based dynamical system(EBDS)model,together with the use of a long short-term memory(LSTM)neural *** time-dependent theory,TC intensity change is controlled by both the internal dynamics of the TC system and various environmental factors,expressed as environmental dynamical *** LSTM neural network is used to predict the environmental dynamical efficiency in the EBDS model trained using besttrack TC data and global reanalysis data during 1982–*** transfer learning and ensemble methods are used to retrain the scheme using the environmental factors predicted by the Global Forecast System(GFS)of the National Centers for Environmental Prediction during 2017–*** predicted environmental dynamical efficiency is finally iterated into the EBDS equations to predict TC *** new scheme is evaluated for TC intensity prediction using both reanalysis data and the GFS prediction *** intensity prediction by the new scheme shows better skill than the official prediction from the China Meteorological Administration(CMA)and those by other state-of-art statistical and dynamical forecast systems,except for the 72-h *** at the longer lead times of 96 h and 120 h,the new scheme has smaller forecast errors,with a more than 30%improvement over the official forecasts.

关键词： tropical cyclones western North Pacific intensity prediction EBDS LSTM

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

Recent advances in landfalling tropical cyclone asymmetric rainfall mechanism and forecast verification over China

引用

Tropical Cyclone Research and Review 2024年第1期13卷 33-40页

作者： Zifeng Yu peiyan chen Fumin Ren Lichun Tang Weiwei Wang Hui Yu Kun Zhao Shanghai Typhoon Institute China Meteorological AdministrationShanghaiChina Asia-Pacific Typhoon Collaborative Research Center ShanghaiChina Chinese Academy of Meteorological Sciences BeijingChina Nanjing University of Information Science and Technology NanjingChina Nanjing University NanjingChina

Held every four years,the International Workshop on Tropical Cyclone(IWTC)organized by the World Meteorological Organization has been a global leading conference in theﬁeld of tropical *** preparation for the 10th IWTC(IWTC-10)in December 2022,a summary of research advances of landfalling tropical cyclone(LTC)rainfall during past four years of 2019–2022 has been *** of the latest research advances has been summarized in Lamers et al.(2023),which reviewed the latest forecast and disaster prevention methods related to TC *** a supplement,this article mainly focuses on the recent advances in LTC asymmetric rainfall evolution mechanisms and forecast veriﬁcation results over *** newﬁndings have been made in the LTC inner-core size relationship with the asymmetric rainfall *** major advances focused on asymmetric microphysical characteristics in the TC *** simulation and forecast per-formances of LTC precipitation have been analyzed,and different forecast error sources for rainfall during different landfall stages of TC were *** estimate the risk of TC rainfall hazards in China,a parameterized Tropical Cyclone Precipitation Model was reviewed as well in this article.

关键词： Tropical cyclone Landfall Rainfall Precipitation forecast veriﬁcation

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

标准化沟通模式在麻醉恢复室护理床旁交接班中的应用

引用

中国当代医药 2024年第10期31卷 173-176页

作者：郭秋月赵婧陈培炎河南省洛阳市中心医院麻醉科河南洛阳471000

目的探讨标准化沟通模式在麻醉恢复室护理床旁交接班中的应用效果。方法选取2022年3月至8月洛阳市中心医院的麻醉恢复室复苏的300例全身麻醉手术患者作为研究对象,2022年3月至5月纳入的150例患者对照组,2022年6月至8月纳入的150例患者... 详细信息

目的探讨标准化沟通模式在麻醉恢复室护理床旁交接班中的应用效果。方法选取2022年3月至8月洛阳市中心医院的麻醉恢复室复苏的300例全身麻醉手术患者作为研究对象,2022年3月至5月纳入的150例患者对照组,2022年6月至8月纳入的150例患者为观察组。对照组采取传统口头和常规交接单进行交接;观察组在常规交接基础上采用标准化沟通模式进行规范交接。比较两组患者交接不良事件发生率,中文版护士交接班评估量表评分以及术后并发症发生率。结果观察组在实施标准化沟通模式交接后,患者交接不良事件发生率和全麻术后并发症发生率均低于对照组,差异具有统计学意义(P<0.05);中文版护士交接班评估量表评分高于对照组,差异具有统计学意义(P<0.05)。结论标准化沟通模式在麻醉恢复室护理床旁交接班中具有较高的应用价值,可以进一步规范麻醉恢复室护理床旁的交接,提高护理人员的交接工作质量,降低了患者的术后并发症的发生率,值得推广应用。

关键词：标准化沟通模式麻醉恢复室护理床旁交接全身麻醉

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Hilbert包络谱熵和GA-SVM的水轮发电机轴承故障诊断

引用

机电工程技术 2024年第3期53卷 199-204页

作者：陈培演孙晓欧立涛于柳陈元健湖南工业大学机械工程学院湖南株洲412007 株洲南方阀门股份有限公司湖南株洲412007

水轮发电机轴承在运行时承受着整体机组的轴向负荷与复杂水推力,针对其产生的非稳态、非线性特征的振动信号,提出一种基于Hilbert包络谱分析与遗传算法支持向量机(GA-SVM)相结合的诊断方法,用于轴承故障状态的识别。首先对推力轴承运行... 详细信息

水轮发电机轴承在运行时承受着整体机组的轴向负荷与复杂水推力,针对其产生的非稳态、非线性特征的振动信号,提出一种基于Hilbert包络谱分析与遗传算法支持向量机(GA-SVM)相结合的诊断方法,用于轴承故障状态的识别。首先对推力轴承运行时产生的振动信号进行集合经验模态分解(Ensemble Empirical Mode Decomposition,EEMD),分解成若干个固有模态函数(Intrinsic Mode Function,IMF),依据峭度准则选取主要IMF分量并通过Hilbert包络谱分析,计算包络谱熵,将归一化后的包络谱熵作为特征向量输入GA-SVM进行训练与故障识别。仿真实验结果表明,基于EEMD包络谱熵分析法相比于时频域图像处理能更好地提取出复杂工况下的故障信号特征,遗传算法支持向量机识别准确率达96.87%,该算法模型可进一步应用于水轮发电机轴承故障诊断。

关键词：水轮发电机轴承故障诊断集合经验模态分解 Hilbert包络谱熵遗传算法支持向量机

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

A simplified index to assess the combined impact of tropical cyclone precipitation and wind on China

引用

Frontiers of Earth Science 2019年第4期13卷 672-681页

作者： peiyan chen Hui YU Ming XU Xiaotu LEI Feng ZENG Shanghai Typhoon Institute China Meteotological AdministrationShanghai 200030China The Joint Laboratory for Typhoon Forecasting Technique Applications between Shanghai Typhoon Institute and Wenzhou Meteorological Bureau Wenzhou 325000China Key Laboratory of Numerical Modeling for Tropical Cyclone China Meteotological AdministrationShanghai 200030China Shanghai Meteorological Service Shanghai 200030China Wenzhou Meteorological Bureau Wenzhou 325000China

Relationships between tropical cyclone(TC)precipitation,wind,and storm damage are analyzed for China based on TCs over the period from 1984 to *** analysis shows that the maximum daily areal precipitation from stations with daily precipitation of ≥50 mm and the sum of wind gusts of ≥13.9 m/s can be used to estimate the main damage caused by TCs,and an index combining the precipitation and wind gust of a TC(IPWT)is defined to assess the severity of the combined impact of precipitation and *** correlation coefficient between IPWT and the damage index for affecting TCs is 0.80,which is higher than that for only precipitation or *** TCs with precipitation and wind affecting China are divided intofive categories,Category 0 to Category 4,based on IPWT,where higher categories refer to higher combined impacts of precipitation and *** combined impact category is closely related to damage category and it can be used to estimate the potential damage category in operational *** are 87.7%,72.9%,69.8%,and 73.4%of cases that have the same or one category difference between damage category and combined impact category for Categories 1,2,3,and 4,*** and its classification can be used to assess the severity of the TC impact and of combined precipitation and wind conveniently and accurately,and the potential damage caused by *** result will be a good supplementary data for TC intensity,precipitation,wind,and *** addition,IPWT can be used as an index to judge the reliability of damage *** analysis of the annual frequency of combined precipitation-wind impact categories reveals no significant increasing or decreasing trend in impact over China over the past 30 years.

关键词： tropical cyclone impact precipitation wind

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

A Logistic-growth-equation-based Intensity Prediction Scheme for Western North Pacific Tropical Cyclones

引用

Advances in Atmospheric Sciences 2021年第10期38卷 1750-1762页

作者： Yanchen ZHOU Jiuwei ZHAO Ruifen ZHAN peiyan chen Zhiwei WU Lan WANG Department of Atmospheric and Ocean Sciences Institute of Atmospheric SciencesFudan UniversityShanghai 200438China Fujian Key Laboratory of Severe Weather Fuzhou 350001China Shanghai Typhoon Institute of China Meteorological Administration Shanghai 200030China Big Data Institute for Carbon Emission and Environmental Pollution Fudan UniversityShanghai 200438China

Accurate prediction of tropical cyclone(TC)intensity remains a challenge due to the complex physical processes involved in TC intensity changes.A seven-day TC intensity prediction scheme based on the logistic growth equation(LGE)for the western North Pacific(WNP)has been developed using the observed and reanalysis *** the LGE,TC intensity change is determined by a growth term and a decay *** two terms are comprised of four free parameters which include a time-dependent growth rate,a maximum potential intensity(MPI),and two *** 33 years of training samples,optimal predictors are selected first,and then the two constants are determined based on the least square method,forcing the regressed growth rate from the optimal predictors to be as close to the observed as *** estimation of the growth rate is further refined based on a step-wise regression(SWR)method and a machine learning(ML)method for the period 1982−*** the LGE-based scheme,a total of 80 TCs during 2015−17 are used to make independent *** show that the root mean square errors of the LGE-based scheme are much smaller than those of the official intensity forecasts from the China Meteorological Administration(CMA),especially for TCs in the coastal regions of East ***,the scheme based on ML demonstrates better forecast skill than that based on *** new prediction scheme offers strong potential for both improving the forecasts for rapid intensification and weakening of TCs as well as for extending the 5-day forecasts currently issued by the CMA to 7-day forecasts.

关键词： tropical cyclone intensity prediction western North Pacific logistic growth equation

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

PREDICTION OF FATIGUE LIVES OF RC BEAMS STRENGTHENED WITH CFL UNDER RANDOM LOADING

引用

Acta Mechanica Solida Sinica 2008年第4期21卷 359-363页

作者： Rongwei Lin peiyan Huang chen Zhao Xinyan Guo Xiaohong Zheng College of Traffic and Communications South China University of Technology Guangzhou 510640 China

The investigation on fatigue lives of reinforced concrete （RC） structures strength- ened with fiber laminate under random loading is important for the repairing or the strengthening of bridges and the safety of the traffic. In this paper, two methods are developed for predicting the fatigue lives of RC structures strengthened with carbon fiber [aminate （CFL） under random loading based on a residual life and a residual strength model. To discuss the efficiency of the model, 12 RC beams strengthened with CFL are tested under random loading by the MTS810 testing system. The predicted residual strength approximately agrees with test results.

关键词： carbon fiber laminate predicted method fatigue life random load RC structure

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BWO优化VMD联合小波阈值的管道泄漏次声波去噪方法

引用

机电工程技术 2024年第3期53卷 54-59页

作者：陈元健黄靖孙晓于柳罗剑宾陈培演湖南工业大学机械工程学院湖南株洲412007 株洲南方阀门股份有限公司湖南株洲412007

管道泄漏次声波信号中的干扰噪声影响管道泄漏定位的精准度。提出了一种基于白鲸优化算法(BWO)优化变分模态分解(VMD)联合小波阈值(WT)的管道泄漏次声波去噪方法。针对VMD算法中分解层数K和惩罚因子α的取值对信号分解结果影响较大,利... 详细信息

管道泄漏次声波信号中的干扰噪声影响管道泄漏定位的精准度。提出了一种基于白鲸优化算法(BWO)优化变分模态分解(VMD)联合小波阈值(WT)的管道泄漏次声波去噪方法。针对VMD算法中分解层数K和惩罚因子α的取值对信号分解结果影响较大,利用白鲸优化算法(BWO)对VMD分解的两关键参数进行寻优,获得最优参数组合[K、α],并利用优化后的参数对次声波信号进行VMD分解,获得一系列本征模函数(IMF)分量。通过计算各IMF分量的相关系数来区分噪声IMF分量和有效IMF分量,引入一种改进的小波阈值函数对有效的IMF分量进行去噪处理,再重构去噪后各有效IMF分量,得到去噪后的管道泄漏次声波信号。通过仿真实验,将所提方法与灰狼优化算法(GWO)优化VMD联合小波阈值和麻雀搜索算法(SSA)优化VMD联合小波阈值两种方法对比,所提方法去噪后信号的信噪比分别提高了1.27%、2.01%,表明所提方法的去噪效果具有一定的优越性,为后续管道泄漏计算定位奠定了良好的基础。

关键词：管道泄漏次声波信号去噪变分模态分解白鲸优化算法小波阈值

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

Impact of physical representations in CALMET on the simulated wind field over land during Super Typhoon Meranti(2016)

引用

Frontiers of Earth Science 2019年第4期13卷 744-757页

作者： Sui HUANG Shengming TANG Hui YU Wenbo XUE Pingzhi FANG peiyan chen Chinese Academy of Meteorological Sciences Beijing 100081China Shanghai Typhoon Institute China Meteorological AdministrationShanghai 200030China Key Laboratory of Numerical Modeling for Tropical Cyclones China Meteorological Administration Shanghai 200030China The Joint Laboratory for Typhoon Forecasting Technique Applications between Shanghai Typhoon Institute and Wenzhou Meteorological Bureau Wenzhou 325000China

A WRF(Weather Research and Forecasting Model)/CALMET(California Meteorological Model)coupled system is used to investigate the impact of physical representations in CALMET on simulations of the near-surface wind field of Super Typhoon Meranti(2016).The coupled system is configured with a horizontal grid spacing of 3 km in WRF and 500 m in CALMET,*** model performance of the coupled WRF/CALMET system is evaluated by comparing the results of simulations with observational data from 981 automatic surface stations in Fujian *** root mean square error(RMSE)of the wind speed at 10 m in all CALMET simulations is significantly less than the WRF simulation by 20%^30%,suggesting that the coupled WRF/CALMET system is capable of representing more realistic simulated wind speed than the mesoscale model *** impacts of three physical representations including blocking effects,kinematic effects of terrain and slope flows in CALMET are examined in a specified local region called Shishe *** results show that before the typhoon landfall in Xiamen,a net downslope flow that is tangent to the terrain is generated in the west of Shishe Mountain due to blocking effects with magnitude exceeding 10 m/***,the blocking effects seem to take no effect in the strong wind area after typhoon *** being affected by the typhoon strong wind or not,the slope flows move downslope at night and upslope in the daytime due to the diurnal variability of the local heat flux with magnitude smaller than 3 m/*** kinematic effects of terrain,which are speculated to play a significant role in the typhoon strong wind area,can only be applied to atmospheric flows in stable conditions when the wind field is quasinondivergent.

关键词： physical representations CALMET wind field Super Typhoon Meranti

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

A Potential Risk Index Dataset for Landfalling Tropical Cyclones over the Chinese Mainland(PRITC dataset V1.0)

引用

Advances in Atmospheric Sciences 2021年第10期38卷 1791-1802页

作者： peiyan chen Hui YU Kevin K.W.CHEUNG Jiajie XIN Yi LU Shanghai Typhoon Institute China Meteorological AdministrationShanghai 200030China Key Laboratory of Numerical Modeling for Tropical Cyclone of China Meteorological Administration Shanghai 20030China The Joint Laboratory for Typhoon Forecasting Technique Applications between Shanghai Typhoon Institute and Wenzhou Meteorological Bureau Wenzhou 325027China Climate and Atmospheric Science NSW Department of Planning Industry and EnvironmentSydney 2000Australia

A dataset entitled“A potential risk index dataset for landfalling tropical cyclones over the Chinese mainland”(PRITC dataset V1.0)is described in this paper,as are some basic statistical *** the severity of the impacts of tropical cyclones(TCs)that make landfall on the Chinese mainland based on observations from 1401 meteorological stations was proposed in a previous study,including an index combining TC-induced precipitation and wind(IPWT)and further information,such as the corresponding category level(CAT_IPWT),an index of TC-induced wind(IWT),and an index of TC-induced precipitation(IPT).The current version of the dataset includes TCs that made landfall from 1949-2018;the dataset will be extended each ***-term trend analyses demonstrate that the severity of the TC impacts on the Chinese mainland have increased,as embodied by the annual mean IPWT values,and increases in TC-induced precipitation are the main contributor to this *** Winnie(1997)and TC Bilis(2006)were the two TCs with the highest IPWT and IPT values,*** PRITC V1.0 dataset was developed based on the China Meteorological Administration’s tropical cyclone database and can serve as a bridge between TC hazards and their social and economic impacts.

关键词： tropical cyclone risk dataset China

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

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：