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Application of deep learning technique to the sea surface height prediction in the South China Sea

Acta Oceanologica Sinica 2021年第7期40卷 68-76页

作者： Tao Song ningsheng han Yuhang Zhu Zhongwei Li Yineng Li Shaotian Li Shiqiu Peng College of Computer and Communication Engineering China University of Petroleum(East China)Qingdao 266580China State Key Laboratory of Tropical Oceanography South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou 511458China Key Laboratory of Science and Technology on Operational Oceanography Chinese Academy of SciencesGuangzhou 511458China Guangxi Key Laboratory of Marine Disaster in the Beibu Gulf Bubei Gulf UniversityQinzhou 535011China Department of Artificial Intelligence Faculty of Computer SciencePolytechnical University of MadridBoadilla del Monte 28660MadridSpain

A deep-learning-based method,called ConvLSTMP3,is developed to predict the sea surface heights(SSHs).ConvLSTMP3 is data-driven by treating the SSH prediction problem as the one of extracting the spatial-temporal features of SSHs,in which the spatial features are“learned”by convolutional operations while the temporal features are tracked by long short term memory(LSTM).Trained by a reanalysis dataset of the South China Sea(SCS),ConvLSTMP3 is applied to the SSH prediction in a region of the SCS east off Vietnam coast featured with eddied and offshore currents in *** results show that ConvLSTMP3 achieves a good prediction skill with a mean RMSE of 0.057 m and accuracy of 93.4%averaged over a 15-d prediction *** particular,ConvLSTMP3 shows a better performance in predicting the temporal evolution of mesoscale eddies in the region than a full-dynamics ocean *** the much less computation in the prediction required by ConvLSTMP3,our study suggests that the deep learning technique is very useful and effective in the SSH prediction,and could be an alternative way in the operational prediction for ocean environments in the future.

关键词： deep learning sea surface height prediction convolutional operation long short term memory

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两样本孟德尔随机化分析循环炎症细胞因子与骨密度的因果关联

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中国组织工程研究 2025年第8期29卷 1556-1564页

作者：陈帅金杰韩化伟田宁晟李志伟南京中医药大学第二附属医院(江苏省第二中医院)骨伤科江苏省南京市210017

背景:最近许多研究表明,炎症细胞因子与骨质疏松症和骨密度之间存在密切关系,然而炎症细胞因子与骨密度之间的因果关系尚未完全揭示。目的:采用两样本孟德尔随机化方法探究炎症细胞因子与骨密度之间潜在的因果关系。方法:从全基因组关... 详细信息

背景:最近许多研究表明,炎症细胞因子与骨质疏松症和骨密度之间存在密切关系,然而炎症细胞因子与骨密度之间的因果关系尚未完全揭示。目的:采用两样本孟德尔随机化方法探究炎症细胞因子与骨密度之间潜在的因果关系。方法:从全基因组关联研究(GWAS)公开数据库中筛选出与41种循环炎症细胞因子相关的单核苷酸多态性作为工具变量。骨密度的GWAS汇总数据来自骨质疏松症遗传因素联盟(GEFOS),共涉及32735名欧洲血统的个体。逆方差加权法作为主要的分析方法来评估因果效应,加权中位数法、MR Egger回归法、简单中位数法和加权中值方法用于补充说明。利用MR-Egger Intercept和MR-PRESSO分析方法进行多效性检验,采用Cochran’s Q检验结果是否存在异质性,同时使用留一法评估结果的稳定性。另外,为了更准确地评估因果关系,采用Bonferroni校正来确定与骨密度有强因果关系的炎症细胞因子。结果与结论:①逆方差加权法分析结果显示,白细胞介素8与腰椎骨密度之间呈正向因果关系(β=0.075,95%CI:0.033-0.117,P=0.0005),白细胞介素17与腰椎骨密度之间呈负向因果关系(β=-0.083,95%CI:-0.152至-0.014,P=0.018),肿瘤坏死因子b与股骨颈骨密度之间可能存在负向因果效应(β=-0.053,95%CI:-0.088至-0.018,P=0.003),碱性成纤维细胞生长因子与股骨颈骨密度之间可能存在正向因果关系(β=0.085,95%CI:0.016-0.154,P=0.015),巨噬细胞炎症蛋白1a与全身骨密度之间可能存在负向因果效应(β=-0.056,95%CI:-0.105至-0.007,P=0.025),白细胞介素5、基质衍生因子1a、肝细胞生长因子、白细胞介素4与足跟骨密度之间存在负向因果效应(β=-0.019,95%CI:-0.031至-0.006,P=0.004;β=-0.022,95%CI:-0.038至-0.005,P=0.010;β=-0.021,95%CI:-0.041至-0.002,P=0.030;β=-0.016,95%CI:-0.032至-0.001,P=0.034),神经生长因子、粒细胞集落刺激因子与足跟骨密度之间存在正向因果关系(β=0.019,95%CI:0.002-0.036,P=0.033;β=0.011,95%CI:0.000-0.022,P=0.050);经Bonferroni校正后发现,白细胞介素8与腰椎骨密度之间有强正向因果效应(P=0.0005)。MR Egger法、加权中位数法、简单中位数法和加权中值法分析结果方向一致。②敏感性分析结果显示,循环炎症细胞因子对骨密度的因果效应没有异质性、多效性或异常值。

关键词：骨质疏松骨密度炎症细胞因子孟德尔随机化因果关系

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基于LSTM的海表面高度异常预测方法

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舰船电子工程 2021年第2期41卷 97-99页

作者：江璟瑜徐丹亚韩宁生王子赫中国石油大学(华东)计算机与科学技术学院青岛266580 南方海洋科学与工程广东省实验室(珠海) 珠海519080

海表面高度异常(SSHA)是海洋系统中重要的参数之一,论文首次利用深度学习中的长短期记忆神经网络(LSTM)对海表面高度异常(SSHA)进行预测。将SSHA的预测当作时间序列预测问题,采用stacked-LSTM,建立海表面高度异常预测模型。该模型能够捕... 详细信息

海表面高度异常(SSHA)是海洋系统中重要的参数之一,论文首次利用深度学习中的长短期记忆神经网络(LSTM)对海表面高度异常(SSHA)进行预测。将SSHA的预测当作时间序列预测问题,采用stacked-LSTM,建立海表面高度异常预测模型。该模型能够捕捉SSHA序列变化的规律,处理序列变化长期依赖问题。通过实验探索了stacked-LSTM预测模型的最佳参数设置,并使用中国南海海域的CORA再分析海表面高度异常数据进行验证,在预测未来24h、48h、72h、96h、120h的SSHA值上准确率(平均值±标准差)分别达到了90.10±10.64%、84.68±14.34%、78.29±17.37%、72.65±18.96%、66.41±20.91%,并与ANN、RNN、TCN等模型进行了对比,该基于数据驱动的模型能够运行在PC终端,为海洋工程提供移动服务。

关键词：海表面高度异常深度学习长短期记忆神经网络数据驱动

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Microstructure and properties of Si-TaSi_2 eutectic in situ composite for field emission

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Chinese Science Bulletin 2007年第7期52卷 984-989页

作者： CUI ChunJuan ZhanG Jun han Min CHEN Jun XU ningsheng LIU Lin FU HengZhi State Key Laboratory of Solidification Processing Northwestern Polytechnical University Xi'an 710072 China State Key Laboratory of Optoelectronic Materials and Technology Zhongshan University Guangzhou 510275 China

The Si-TaSi2 eutectic in situ composite for field emission is prepared by electron beam floating zone melting (EBFZM) technique on the basis of Czochralski (CZ) crystal growth technique. The directional solidification microstructure and the field emission properties of the Si-TaSi2 eutectic in situ composite prepared by two kinds of crystal growth techniques have been systematically tested and compared. Researches demonstrated that the solidification microstructure of EBFZM can be fined obviously be-cause of the relatively high solidification rate and very high temperature gradient, i.e. both the diameter and inter-rod spacing of the TaSi2 fibers prepared by EBFZM technique were decreased, and the density and the volume fraction of the TaSi2 fibers prepared by EBFZM technique were increased in comparison with that of the TaSi2 fibers prepared by CZ method. Therefore the field emission property of the Si-TaSi2 eutectic in situ composite prepared by EBFZM can be improved greatly, which exhibits better field emission uniformity and straighter F-N curve.

关键词：硅化钽 Si-TaSi2共晶原位复合材料场发射显示屏显微结构性质

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Modelling the temporal-varied nonlinear velocity profile of debris flow using a stratification aggregation algorithm in 3D-HBP-SPH framework

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Journal of Mountain Science 2024年第12期21卷 3945-3960页

作者： han Zheng XIE Wendu ZENG Chuicheng LI Yange CHEN Guangqi CHEN ningsheng HU Guisheng WANG Weidong School of Civil Engineering Central South UniversityChangsha 410075China Hunan Provincial Key Laboratory for Disaster Prevention and Mitigation of Rail Transit Engineering Structures Changsha 410075China The Key Laboratory of Engineering Structures of Heavy Haul Railway Ministry of EducationChangsha 410075China Department of Civil Engineering Kyushu UniversityFukuoka 819-0395Japan Key Lab of Mountain Hazards and Surface Processes Institute of Mountain Hazards and EnvironmentChinese Academy of SciencesChengdu 610041China

Estimation of velocity profile within mud depth is a long-standing and essential problem in debris flow *** now,various velocity profiles have been proposed based on the fitting analysis of experimental measurements,but these are often limited by the observation conditions,such as the number of configured ***,the resulting linear velocity profiles usually exhibit limitations in reproducing the temporal-varied and nonlinear behavior during the debris flow *** this study,we present a novel approach to explore the debris flow velocity profile in detail upon our previous 3D-HBPSPH numerical model,i.e.,the three-dimensional Smoothed Particle Hydrodynamic model incorporating the Herschel-Bulkley-Papanastasiou ***,we propose a stratification aggregation algorithm for interpreting the details of SPH particles,which enables the recording of temporal velocities of debris flow at different mud *** analyze the velocity profile,we introduce a logarithmic-based nonlinear model with two key parameters,that a controlling the shape of velocity profile and b concerning its temporal *** verify the proposed velocity profile and explore its sensitivity using 34 sets of velocity data from three individual flume experiments in previous *** results demonstrate that the proposed temporalvaried nonlinear velocity profile outperforms the previous linear profiles.

关键词： Debris flow Velocity profile Temporal varied feature Nonlinear Stratification aggregation algorithm

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The Critical Rainfall Characteristics for Torrents and Debris Flows in the Wenchuan Earthquake Stricken Area

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Journal of Mountain Science 2009年第4期6卷 362-372页

作者： CHEN ningsheng YANG Chenglin ZHOU Wei HU Guisheng LI Huan David han Key Lab of Mountain Hazards and Surface Processes Chinese Academy of Sciences Chengdu China610041 Institute of Mountain Hazards and Environment ChineseAcademy of Sciences Chengdu China 610041 College of Water Resource & Hydropower ofSCU Chengdu China 610065 d Department of Civil Engineering University of Bristol UK Department of Civil Engineering University of Bristol UK

Critical rainfall assessment is a very important tool for hazard management of torrents and debris flows in mountainous areas. The Wenchuan Earthquake 2008 caused huge casualties and property damages in the earthquake-stricken area,which also generated large quantities of loose solid materials and increased occurrence probabilities of debris flows. There is an urgent need to quantify the critical rainfall distribution in the area so that better hazard management could be planned and if real time rainfall forecast is available,torrent and debris flow early-warning could be issued in advance. This study is based on 49-year observations (1954-2003) of up to 678 torrent and debris flow events. Detailed contour maps of 1 hour and 24 hour critical rainfalls have been generated (Due to the data limitation,there was insufficient 10 minute critical rainfall to make its contour map). Generally,the contour maps from 1 hour and 24 hours have similar patterns. Three zones with low,medium and high critical rainfalls have been identified. The characteristics of the critical rainfall zones are linked with the local vegetation cover and land forms. Further studies and observations are needed to validate the finding and improve the contour maps.

关键词： Debris flow Mountain torrent Earthquake-stricken area Critical rainfall

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Flooding and its relationship with land cover change, population growth, and road density

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Geoscience Frontiers 2021年第6期12卷 16-35页

作者： Mahfuzur Rahman Chen ningsheng Golam Iftekhar Mahmud Md Monirul Islam Hamid Reza Pourghasemi Hilal Ahmad Jules Maurice Habumugisha Rana Muhammad Ali Washakh Mehtab Alam Enlong Liu Zheng han Huayong Ni Tian Shufeng Ashraf Dewan Key Laboratory for Mountain Hazards and Earth Surface Process Institute of Mountain Hazards and Environment(IMHE)Chinese Academy of Sciences(CAS)Chengdu 610041China University of Chinese Academy of Sciences(UCAS) Beijing 100049China Department of Civil Engineering International University of Business Agriculture and Technology(IUBAT)Dhaka 1230Bangladesh Academy of Plateau Science and Sustainability Xining 810016China Development Research Initiative Dhaka 1216Bangladesh Department of Natural Resources and Environmental Engineering College of AgricultureShiraz UniversityShiraz 71454Iran School of Architecture Neijiang Normal UniversityNeijiang 641100China Institute of Tibetan Plateau Research Chinese Academy of SciencesBeijing 100101China State Key Laboratory of Hydraulics and Mountain River Engineering College of Water Resource and HydropowerSichuan UniversityChengdu 610065China School of Civil Engineering Central South UniversityChangsha 410075China Chengdu Institute of Geology and Mineral Resources China Geological SurveyChina School of Earth and Planetary Sciences Curtin UniversityKent StBentleyWA 6102Australia

Bangladesh experiences frequent hydro-climatic disasters such as *** disasters are believed to be associated with land use changes and climate ***,identifying the factors that lead to flooding is *** study mapped flood susceptibility in the northeast region of Bangladesh using Bayesian regularization back propagation(BRBP)neural network,classification and regression trees(CART),a statistical model(STM)using the evidence belief function(EBF),and their ensemble models(EMs)for three time periods(2000,2014,and 2017).The accuracy of machine learning algorithms(MLAs),STM,and EMs were assessed by considering the area under the curve—receiver operating characteristic(AUC-ROC).Evaluation of the accuracy levels of the aforementioned algorithms revealed that EM4(BRBP-CART-EBF)outperformed(AUC>90%)standalone and other ensemble models for the three time periods ***,this study investigated the relationships among land cover change(LCC),population growth(PG),road density(RD),and relative change of flooding(RCF)areas for the period between 2000 and *** results showed that areas with very high susceptibility to flooding increased by 19.72%between 2000 and 2017,while the PG rate increased by 51.68%over the same *** Pearson correlation coefficient for RCF and RD was calculated to be *** findings highlight the significant association between floods and causative *** study findings could be valuable to policymakers and resource managers as they can lead to improvements in flood management and reduction in flood damage and risks.

关键词： Hydro-climatic disasters Machine learning algorithms Statistical model Ensemble model Relative change in flooding areas

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载体对镍基载氧剂化学链燃烧反应特性的作用

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高技术通讯 2007年第5期17卷 503-507页

作者：韩海锦蔡宁生李振山清华大学热能工程系热科学与动力工程教育部重点实验室北京100084

采用热重分析仪（TGA）研究了三种镍基载氧剂在化学链燃烧中的循环反应特性,考察了添加不同载体对载氧剂循环反应性能的影响,分析了影响载氧剂转化率的因素。实验结果表明,烧结使得NiO循环反应活性随着循环次数的增加而降低;添加铝酸镍... 详细信息

采用热重分析仪（TGA）研究了三种镍基载氧剂在化学链燃烧中的循环反应特性,考察了添加不同载体对载氧剂循环反应性能的影响,分析了影响载氧剂转化率的因素。实验结果表明,烧结使得NiO循环反应活性随着循环次数的增加而降低;添加铝酸镍（NiAl2O4）和铝酸钙（12CaO·7Al2O3）载体以后,镍基载氧剂比表面积和孔隙率得到提高,载体能有效抑制颗粒之间的烧结,使载氧剂的循环反应活性保持稳定。

关键词：化学链燃烧镍基载氧剂载体烧结积炭循环反应

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十六国时期少数民族政权法制的历史影响

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民族研究 2006年第2期 78-86页

作者：何宁生西北大学法学院

十六国时期少数民族所建政权的法律制度多循魏晋,但当时一些有为君主为了适应特殊情势的需要,在取舍中原汉制的基础上,又制定了一些新的法律制度,在行政、刑事、民事、经济、婚姻、司法等制度方面均有所建树,从而使十六国时期的法制在... 详细信息

十六国时期少数民族所建政权的法律制度多循魏晋,但当时一些有为君主为了适应特殊情势的需要,在取舍中原汉制的基础上,又制定了一些新的法律制度,在行政、刑事、民事、经济、婚姻、司法等制度方面均有所建树,从而使十六国时期的法制在中华法制文明发展史上留下了自己的身影。

关键词：十六国时期少数民族政权法制

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张衡地动仪立柱验震的复原与研究

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中国科技史杂志 2020年第3期41卷 425-434页

作者：胡宁生中国科学院南京天文光学技术研究所

关于张衡地动仪的复原,130年来学者们提出多种模型。其中立柱模型往往被否定,因为立柱验震被断定是不可能实现的。本文对立柱验震进行分析,指出前人实验失败是因为都没有充分认识到立柱验震的力学原理。根据力学原理列出的立柱验震的一... 详细信息

关于张衡地动仪的复原,130年来学者们提出多种模型。其中立柱模型往往被否定,因为立柱验震被断定是不可能实现的。本文对立柱验震进行分析,指出前人实验失败是因为都没有充分认识到立柱验震的力学原理。根据力学原理列出的立柱验震的一系列必要条件,并用汉代工艺成功制作了三台立柱验震演示仪实物。立柱模型必需在立柱下面安排一个精密的小"着地面",首先必须对立柱下的支承面进行置平调整和对立柱的重心进行平衡调整。立柱验震现场演示通过专家的鉴定,获得成功,为张衡地动仪的正名和复原提供了新的可靠的依据。

关键词：张衡地动仪立柱验震悬摆验震倒立摆验震

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