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Application of the Conditional Nonlinear Local Lyapunov Exponent to Second-Kind Predictability

Advances in Atmospheric Sciences 2024年第9期41卷 1769-1786页

作者： Ming ZHANG Ruiqiang DING Quanjia ZHONG Jianping LI deyu lu State Key Laboratory of Earth Surface Processes and Resource Ecology(ESPRE)/Key Laboratory of Environmental Change and Natural Disasters of Chinese Ministry of EducationBeijing Normal UniversityBeijing 100875China Department of Ocean Science Hong Kong University of Science and TechnologyHong KongChina College of Oceanic and Atmospheric Sciences/Frontiers Science Center for Deep Ocean Multispheres and Earth System(DOMES)/Key Laboratory of Physical Oceanography Ministry of Education/Academy of the Future Ocean/Center for Ocean Carbon NeutralityOcean University of ChinaQingdao 266100China Laoshan Laboratory Qingdao 266237China State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics(LASG) Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China College of Earth Science University of Chinese Academy of SciencesBeijing 100049China

In order to quantify the influence of external forcings on the predictability limit using observational data,the author introduced an algorithm of the conditional nonlinear local Lyapunov exponent(CNLLE)*** effectiveness of this algorithm is validated and compared with the nonlinear local Lyapunov exponent(NLLE)and signal-to-noise ratio methods using a coupled Lorenz *** results show that the CNLLE method is able to capture the slow error growth constrained by external forcings,therefore,it can quantify the predictability limit induced by the external *** this basis,a preliminary attempt was made to apply this method to measure the influence of ENSO on the predictability limit for both atmospheric and oceanic variable *** spatial distribution of the predictability limit induced by ENSO is similar to that arising from the initial conditions calculated by the NLLE *** similarity supports ENSO as the major predictable signal for weather and climate *** addition,a ratio of predictability limit(RPL)calculated by the CNLLE method to that calculated by the NLLE method was *** RPL larger than 1 indicates that the external forcings can significantly benefit the long-term predictability *** instance,ENSO can effectively extend the predictability limit arising from the initial conditions of sea surface temperature over the tropical Indian Ocean by approximately four months,as well as the predictability limit of sea level pressure over the eastern and western Pacific ***,the impact of ENSO on the geopotential height predictability limit is primarily confined to the troposphere.

关键词： conditional nonlinear local Lyapunov exponent second-kind predictability coupled Lorenz model ENSO

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Impact of Perturbation Schemes on the Ensemble Prediction in a Coupled Lorenz Model

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Advances in Atmospheric Sciences 2023年第3期40卷 501-513页

作者： Qian ZOU Quanjia ZHONG Jiangyu MAO Ruiqiang DING deyu lu Jianping LI Xuan LI State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics(LASG) Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China College of Earth Science University of Chinese Academy of SciencesBeijing 100049China State Key Laboratory of Earth Surface Processes and Resource Ecology Beijing Normal UniversityBeijing 100875China Frontiers Science Center for Deep Ocean Multispheres and Earth System(FDOMES)/Key Laboratory of Physical Oceanography/Institute for Advanced Ocean Studies Ocean University of ChinaQingdao 266100China Laboratory for Ocean Dynamics and Climate Pilot Qingdao National Laboratory for Marine Science and TechnologyQingdao 266237China Department of Atmospheric and Oceanic Sciences and Institute of Atmospheric Sciences Fudan UniversityShanghai 200438China

Based on a simple coupled Lorenz model,we investigate how to assess a suitable initial perturbation scheme for ensemble forecasting in a multiscale system involving slow dynamics and fast *** initial perturbation approaches are used in the ensemble forecasting experiments:the random perturbation(RP),the bred vector(BV),the ensemble transform Kalman filter(ETKF),and the nonlinear local Lyapunov vector(NLLV)*** show that,regardless of the method used,the ensemble averages behave indistinguishably from the control forecasts during the first few time *** to different error growth in different time-scale systems,the ensemble averages perform better than the control forecast after very short lead times in a fast subsystem but after a relatively long period of time in a slow *** to the coupled dynamic processes,the addition of perturbations to fast variables or to slow variables can contribute to an improvement in the forecasting skill for fast variables and slow *** the initial perturbation approaches,the NLLVs show higher forecasting skill than the BVs or RPs *** NLLVs and ETKFs had nearly equivalent prediction skill,but NLLVs performed best by a narrow *** particular,when adding perturbations to slow variables,the independent perturbations(NLLVs and ETKFs)perform much better in ensemble *** results are simply implied in a real coupled air–sea *** the prediction of oceanic variables,using independent perturbations(NLLVs)and adding perturbations to oceanic variables are expected to result in better performance in the ensemble prediction.

关键词： ensemble prediction nonlinear local Lyapunov vector(NLLV) ensemble transform Kalman filter(ETKF) coupled air-sea models

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Electron surfing acceleration in a current sheet of flares

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Science China(Physics,Mechanics & Astronomy) 2009年第11期52卷 1810-1812页

作者： WANG deyu1 & lu QuanMing2 1 Purple Mountain Observatory, Nanjing 210008, China 2 School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China Purple Mountain Observatory Nanjing China School of Earth and Space Sciences University of Science and Technology of China Hefei China

A model of electron acceleration in a current sheet of flares is studied by the analytical approximation solution and the test particle simulation. The electron can be trapped in a potential of propagating electrostatic wave. The trapped electron moving with the phase velocity v p of wave may be effectively accelerated by ev p/c × B z force along the outflow direction in the current sheet, if a criterion condition K > 0 for electron surfing acceleration is satisfied. The electron will be accelerated continuously until the electron de-trap from the wave potential at the turning point S.

关键词： electron acceleration electrostatic wave current sheet

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Understanding the local structure and thermophysical behavior of Mg-La liquid alloys via machine learning potential

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 439-449页

作者： Jia Zhao Taixi Feng Guimin lu National Engineering Research Center for Integrated Utilization of Salt Lake Resource East China University of Science and TechnologyShanghai 200237China Joint International Laboratory for Potassium and Lithium Strategic Resources East China University of Science and TechnologyShanghai 200237China

The local structure and thermophysical behavior of Mg-La liquid alloys were in-depth understood using deep potential molecular dynamic(DPMD) simulation driven via machine learning to promote the development of Mg-La alloys. The robustness of the trained deep potential(DP) model was thoroughly evaluated through several aspects, including root-mean-square errors(RMSEs), energy and force data, and structural information comparison results;the results indicate the carefully trained DP model is reliable. The component and temperature dependence of the local structure in the Mg-La liquid alloy was analyzed. The effect of Mg content in the system on the first coordination shell of the atomic pairs is the same as that of temperature. The pre-peak demonstrated in the structure factor indicates the presence of a medium-range ordered structure in the Mg-La liquid alloy, which is particularly pronounced in the 80at% Mg system and disappears at elevated temperatures. The density, self-diffusion coefficient, and shear viscosity for the Mg-La liquid alloy were predicted via DPMD simulation, the evolution patterns with Mg content and temperature were subsequently discussed, and a database was established accordingly. Finally, the mixing enthalpy and elemental activity of the Mg-La liquid alloy at 1200 K were reliably evaluated,which provides new guidance for related studies.

关键词： magnesium-lanthanum liquid alloys local structure macroscopic properties thermodynamic behavior deep potential mo-lecular dynamic simulation

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软件挖潜提高CNC加工系统精度

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指挥技术学院学报 1994年第1期5卷 42-50页

作者：沈德雨卢平指挥技术学院基础部

本文调查了影响ＣＮＣ加工系统精度的主要因素，分析了软件设计中的误差及其来源，基于二维加工系统以ＴｕｒｂｏＣ编程为例探讨了如何挖掘软件潜力来保障和提高ＣＮＣ加工系统的精度指标。

关键词：数控系统软件精度工艺系统

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着色锦纶三层流网捕捞试验

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齐鲁渔业 1998年第4期15卷 16-17页

作者：卢德裕福建省仙游县农业局水产站 351200

选择浅绿色或海蓝色较细的锦纶丝织成的三层流网进行捕捞试验，结果表明，着色网比本色网提高产量22．94％，增加产值22．98％。报道了着色锦纶三层流网的技术参数、网线直径、网具结构与装配。

关键词：锦纶丝网线直径网具参数捕捞试验三层流网

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CNC技术与Mechatronics

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指挥技术学院学报 1994年第2期 86-89页

作者：沈德雨卢平曾海光指挥技术学院基础部

首先指出了大力发展ＣＮＣ技术和开发Ｍｅｃｈａｔｒｏｎｉｃｓ高新技术产品的现实意义，接着扼要综述了ＣＮＣ技术的发展及应用，最后简短介绍了Ｍｅｃｈａｔｒｏｎｉｃｓ概念及其与ＣＮＣ技术的关系。

关键词： CNC 机电一体化

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萤火虫荧光素酶基因在爪蟾卵母细胞中的表达

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生物工程学报 1991年第4期7卷 318-322页

作者：金振华陆德裕黄河王海燕裴文罗林中国科学院发育生物学研究所

用限制酶BamHI切割质粒pDO432并经琼脂糖凝胶电泳分离,将所得荧光素酶编码序列作为插入片段。用Hind Ⅲ和BamH Ⅰ切割pSVK100去除galk基因及部分tsplice序列作为载体,构建了一对其启动区和荧光素酶编码序列位向相反的质粒,pSV-luc19及pS... 详细信息

用限制酶BamHI切割质粒pDO432并经琼脂糖凝胶电泳分离,将所得荧光素酶编码序列作为插入片段。用Hind Ⅲ和BamH Ⅰ切割pSVK100去除galk基因及部分tsplice序列作为载体,构建了一对其启动区和荧光素酶编码序列位向相反的质粒,pSV-luc19及pSV-luc20。正位向的pSV-luc20能在爪蟾卵母细胞中转录,翻译并产生活性酶蛋白。结果表明:荧光素酶基因和爪蟾卵母细胞可以构成一个监测启动子活性的有效系统。

关键词：荧光素酶爪蟾卵母细胞基因表达

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Controllable synthesis of biomimetic wood stem nanoporous high entropy oxides catalysts for oxygen evolution reaction

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Nano Research 2025年第1期18卷 107-117页

作者： Wei Wang Weiqi Wang Huihui Wang Xing lu Jinwen Zhang Yunzhuo lu School of Materials Science and Engineering Dalian Jiaotong UniversityDalian 116028China School of Intelligence and Electronic Engineering Dalian Neusoft University of InformationDalian 116023China Guangdong Key Laboratory of Materials and Equipment in Harsh Marine Environment Guangzhou Maritime UniversityGuangzhou 510725China

Bubbles generated during the oxygen evolution reaction(OER)in water splitting readily adhere to the electrode surface,thereby impeding contact between the electrolyte and the active sites,thereby increasing the ***,it is imperative to elucidate the bubble release behavior and engineer electrodes that facilitate faster bubble *** this study,inspired by the wood stem of the Norway spruce,we synthesized a gradient nanoporous high-entropy oxide(GNP-HEO)electrode with a controllable pore *** GNP-HEO,featuring a well-controlled gradient in pore size,is achieved through a straightforward strategy combining selective laser melting with selective phase *** unique gradient nanoporous structure not only facilitates bubble release but also diminishes the bubble shielding effect in OER,thereby enhancing electrocatalytic *** affect interaction of Al,Co,Cr,Fe,and Ni,coupled with the gradient nanoporous structure,yields exceptional OER performance,evidenced by an overpotential of 250 mV at a current density of 50 mA/cm^(2) and a Tafel slope of 38.0 mV/dec in 1 M *** functional theory calculations confirm that the GNPHEO adheres to the adsorbate evolution mechanism reaction pathway and exhibits significant *** work highlights a promising approach for the design and synthesis of high-performance OER electrocatalysts.

关键词： oxygen evolution reaction high-entropy oxides selective phase dis-solution selective laser melting gradient nanoporous

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MICROINJECTION OF HUMAN β-GLOBIN GENE INTO FERTILIZED MOUSE EGG

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Chinese Science Bulletin 1985年第6期30卷 822-825页

作者：陆德裕金振华李光三冯燕玲王亚平 Institute of Developmental Biology Academia Sinica Beijing Institute of Developmental Biology Academia Sinica Beijinghe technique of transferring cloned specific genes from one mammalian species into the pronucleus of a fertilized egg of another by microinjection was started in 1980 and has since developed into a new field of research. Using this approach we may as-

The technique of transferring cloned specific genes from one mammalian species into the pronucleus of a fertilized egg of another by microinjection was started in 1980 and has since developed into a new field of resea... 详细信息

关键词： cloned transferring mammalian Plasmid persist foster inserting allowed grateful notably

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