检索结果-南通市图书馆

Three-dimensional mesoscale eddy identification and tracking algorithm based on pressure anomalies liming

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

Journal of Oceanology and Limnology 2021年第6期39卷 2153-2166页

作者： liming YUAN Fenglin TIAN Suqin XU Chun ZHOU Jie CHEN CSSC Ocean Exploration Technology Institute Co. Ltd.Wuxi 214000China College of Information Science and Engineering Ocean University of ChinaQingdao 266100China PLA Naval Submarine Academy Qingdao 266199China

The Kuroshio Extension(KE)is one of the most eddy-energetic regions in the global ***,most mesoscale eddy studies in the region are focused on surface eddies and the structure and characteristics of three-dimensional(3-D)eddies require additional *** this study,we proposed a 3-D eddy identification and tracking algorithm based on pressure anomalies,similar to sea level anomalies(SLAs)for surface eddy *** applied this scheme to a 5-year(2008-2012)high-resolution numerical product to develop a 3-D eddy dataset in the *** reliability of the numerical product was verified by the 5-year temperature/salinity hydrological characteristics and surface eddy *** to the 3-D eddy tracking dataset,the number of eddies decreased dramatically as the eddy existence-time increased and more anticyclonic eddies(AEs)had an existence-time longer than 1 week than cyclonic eddies(CEs).We presented daily variations in the 3-D structure of two 3-D eddy-tracking trajectories that exhibit a certain jump in depth and a shift toward the west and *** addition to the bowl,lens,and cone eddies that have been discovered by previous researchers,we found that there is a cylindrical eddy,and its eddy radii are almost consistent across all *** cause significant negative temperature anomalies,“negative-positive”salinity anomalies,and sinking current fields in the KE region,while AEs cause positive temperature anomalies,“positive-negative”salinity anomalies,and upward current *** four types of eddies have different effects on the temperature/salinity anomalies and current field distribution which are related to their structure.

关键词： mesoscale eddy pressure anomalies three-dimensional structure identification tracking

Message from Deputy Editor-in-Chief liming Li—On the Launch of the China CDC Weekly

在线全文

学校读者我要写书评

暂无评论

China CDC weekly 2019年第3期1卷 31-31页

作者： liming Li School of Public Health Peking University

As the Founding Director-General of China CDC and the Deputy Editor-in-Chief,I would like to express my heartfelt congratulations for the China CDC *** health in China has been keeping pace with the development and construction of New China through its world-renowned *** its 70 years of experience,China has established a public health system for epidemic and disease prevention with the following aspects.

关键词： prevention Director accomplishment

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

绿色金融、碳排放约束与能源技术创新

生态经济 2025年第1期41卷 99-105,122页

作者：肖黎明贾均焱山西师范大学经济与管理学院山西太原030031

能源技术创新是实现全球长期可持续发展以及“双碳”目标的重要途径。基于2010—2019年全国30个省份的面板数据,构建固定效应模型与调节效应模型实证分析绿色金融对能源技术创新的影响与作用机制,结果表明:(1)绿色金融能够显著促进能源... 详细信息

能源技术创新是实现全球长期可持续发展以及“双碳”目标的重要途径。基于2010—2019年全国30个省份的面板数据,构建固定效应模型与调节效应模型实证分析绿色金融对能源技术创新的影响与作用机制,结果表明:(1)绿色金融能够显著促进能源领域的技术创新,并且绿色金融与碳排放约束之间的协同互补效应也对能源技术创新具有正向影响,经过一系列稳健性检验后结论依然成立。(2)机制分析表明,资本深化在绿色金融影响能源技术创新的过程中发挥负向调节作用,即资本深化削弱了绿色金融对于能源技术创新的积极作用。(3)异质性分析结果显示,绿色金融对能源技术创新的作用存在显著的区域差异,其中绿色金融在中西部地区的促进效果明显优于东部地区。该研究为完善绿色金融对能源技术创新的影响提供了理论依据与经验证据,从而为绿色金融更好服务于能源领域的转型发展提供有益启示。

关键词：绿色金融碳排放约束资本深化能源技术创新

同方期刊数据库

ENTROPICAL OPTIMAL TRANSPORT,SCHRODINGER'S SYSTEM AND ALGORITHMS

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Scientia 2021年第6期41卷 2183-2197页

作者： liming WU Institute for Advanced Study in Mathematics Harbin’s Institute of TechnologyHarbin150001China Laboratoire de Mathématiques Blaise Pascal CNRS-UMR 6620UniversitéClermont-Auvergne(UCA)63000Clermont-FerrandFrance

In this exposition paper we present the optimal transport problem of Monge-Ampère-Kantorovitch(MAK in short)and its approximative entropical *** to the MAK optimal transport problem,the solution of the entropical optimal transport problem is always unique,and is characterized by the Schrödinger *** relationship between the Schrödinger system,the associated Bernstein process and the optimal transport was developed by Léonard[32,33](and by Mikami[39]earlier via an h-process).We present Sinkhorn’s algorithm for solving the Schrödinger system and the recent results on its convergence *** study the gradient descent algorithm based on the dual optimal question and prove its exponential convergence,whose rate might be independent of the regularization *** exposition is motivated by recent applications of optimal transport to different domains such as machine learning,image processing,econometrics,astrophysics etc..

关键词： entropical optimal transport Schrödinger system Sinkhorn’s algorithm gradient descent

Linearly Polarization-Sensitive Perovskite Photodetectors

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2023年第6期15卷 428-435页

作者： Jie Sun liming Ding Center for Excellence in Nanoscience(CAS) Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS)National Center for Nanoscience and TechnologyBeijing 100190People’s Republic of China University of Chinese Academy of Sciences Beijing 100049People’s Republic of China

Polarization means symmetry loss for light vibration along light propagation direction,which is a particular physical property of *** polarization state is indecipherable for most polarization-insensitive *** can carry and differentiate light information,and can be used in polarized light detection,polarization imaging and encryption communication[1].Photodetectors are the core component of some photoelectric devices[2]used in biomedical sensing,remote sensing,military field,etc.

关键词： Polarization symmetry polarized

ASYMPTOTIC ANALYSIS OF DYNAMIC PROBLEMS FOR LINEARLY ELASTIC SHELLS--JUSTIFICATION OF EQUATIONS FOR DYNAMIC FLEXURAL SHELLS

在线全文

学校读者我要写书评

暂无评论

Chinese Annals of Mathematics,Series B 2001年第3期22卷 13-22页

作者： XIAO liming Institute of Mathematics Fudan University Shanghai 200433 China Department of Computer Science Guangdong Normal Polytechnic Guangzhou 510665 China

Under certain conditions, starting from the three-dimensional dynamic equations of elastic shells the author gives the justification of dynamic equations of flexural shells by means of the method of asymptotic analysis.

关键词： Dynamics for elastic shells Asymptotic analysis Flexural shells Space of inextensional displacement Body force density

同方期刊数据库

Microstructure and mechanical performance of AZ31/6061 lap joints welded by laser-TIG hybrid welding with Zn-Al alloy filler metal

在线全文

学校读者我要写书评

暂无评论

Journal of Magnesium and Alloys 2024年第8期12卷 3325-3338页

作者： Xinze Lv liming Liu Key Laboratory of Liaoning Advanced Welding and Joining Technology School of Materials Science and EngineeringDalian University of TechnologyDalian116024China

A series of Zn-xAl(x=0-35 wt.%)alloy filler metals were designed to join AZ31 Mg alloy to 6061 Al alloy by laser-TIG hybrid *** effect of Al content on the wettability of filler metals,microstructure evolution and strength of joint was *** results indicated that the strength of joints was improved with the increase of Al content in filler *** Zn-15Al filler was used,the ultimate fracture load reached the maximum of 1475.3 N/cm,which was increased by 28%than that with pure Zn *** reason is that the Al element acts as a"reaction depressant"in filler metal,which contributes to inhibiting the dissolution of Mg base metal and the Mg-Zn *** addition of appropriate quantity of Al element promoted the precipitation of Al-rich solid solution instead of Zn solid *** MgZn_(2) IMCs have lower lattice mismatch with Al solid solution than Zn solid solution,thus the strength of joints is ***,the excessive addition of Al caused the formation of brittle Mg32(Al,Zn)49 ternary compounds,leading to the deterioration of joint performance.

关键词： Laser-TIG hybrid welding Mg-Al dissimilar joint Intermetallic compounds Microstructure Fracture

Composition Engineering Opens an Avenue Toward Efficient and Sustainable Nitrogen Fixation

在线全文

学校读者我要写书评

暂无评论

Energy & Environmental Materials 2024年第1期7卷 313-325页

作者： Xiaolin Wang liming Yang Key Laboratory of Material Chemistry for Energy Conversion and Storage Ministry of EducationWuhan 430074China Hubei Key Laboratory of Materials Chemistry and Service Failure Wuhan 430074China Hubei Key Laboratory of Bioinorganic Chemistry and Materia Medica Wuhan 430074China Hubei Engineering Research Center for Biomaterials and Medical Protective Materials Wuhan 430074China School of Chemistry and Chemical Engineering Huazhong University of Science and TechnologyWuhan 430074China

In this work,we open an avenue toward rational design of potential efficient catalysts for sustainable ammonia synthesis through composition engineering strategy by exploiting the synergistic effects among the active sites as exemplified by diatomic metals anchored graphdiyne via the combination of hierarchical high-throughput screening,first-principles calculations,and molecular dynamics *** 43 highly efficient catalysts feature ultralow onset potentials(|U_(onset)|≤0.40 V)with Rh-Hf and Rh-Ta showing negligible onset potentials of 0 and-0.04 V,*** high catalytic activities of Rh-Hf and Rh-Ta can be ascribed to the synergistic *** forming heteronuclears,the combinations of relatively weak(such as Rh)and relatively strong(such as Hf or Ta)components usually lead to the optimal strengths of adsorption Gibbs free energies of reaction *** origin can be ascribed to the mediate d-band centers of Rh-Hf and Rh-Ta,which lead to the optimal adsorption strengths of intermediates,thereby bringing the high catalytic *** work provides a new and general strategy toward the architecture of highly efficient catalysts not only for electrocatalytic nitrogen reduction reaction(eNRR)but also for other important *** expect that our work will boost both experimental and theoretical efforts in this direction.

关键词： composition engineering strategy diatomic catalysts electrocatalytic nitrogen reduction reaction first-principles calculations graphdiyne hierarchical high-throughput screening synergistic effects

Spatio-temporal variation of hydrological drought under climate change during the period 1960–2013 in the Hexi Corridor, China

在线全文

学校读者我要写书评

暂无评论

Journal of Arid Land 2016年第2期8卷 157-171页

作者： GAO liming Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of SciencesLanzhou 730000China Gansu Data Engineering and Technology Research Center for Resources and Environment Lanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China

In recent years, climate change has been aggravated in many regions of the wodd. The Hexi Corridor is located in the semiarid climate zone of Northwest China, which is parUculady affected by climate change. Climate change has led to the spatial and temporal variations of temperature and precipitation, which may result in hydrological drought and water shortage. Thus, it is necessary to explore and assess the drought characteristics of river systems in this area. The patterns of hydrological drought in the Hexi Corridor were identified using the streamflow drought index （SDI） and standardized precipitation index at 12-month timescale （SPI12） from 1960 to 2013. The evolution of drought was obtained by the Mann-Kendall test and wavelet transform method. The results showed that both the mean annual SDI and SPI12 series in the Hexi Corridor exhibited an increasing trend during the study period. According to the results of wavelet analysis, we divided the study period into two segments, i.e. before and after 1990. Before 1990, the occurrence of droughts showing decreased SDI and SPI12 was concentrated in the northern part of the corridor and shifted to the eastern part of the corridor after 1990. The probability of drought after 1990 in Shule River basin decreased while increased in Shiyang River basin. The wavelet analysis results showed that Shiyang River basin will be the first area to go through the next drought period. Additionally, the relationships between drought pattern and climate indices were analyzed. The enhanced westedy winds and increased precipitation and glacier runoff were the main reasons of wet trend in the Hexi Corridor. However, the uneven spatial variations of precipitation, temperature and glacier runoff led to the difference of hydrological drought variations between the Shule, Heihe and Shiyang River basins.

关键词： Hcxi Corridor , sUramflow drought index standardized precipitation index westerly index glacier runoff temperature