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A Novel Spacetime Collocation Meshless Method for Solving Two- Dimensional Backward Heat Conduction Problems

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Computer Modeling in Engineering & Sciences 2019年第1期118卷 229-252页

作者： Chihyu Liu Chengyu Ku jingen xiao Weichung Yeih Department of Harbor and River Engineering National Taiwan Ocean UniversityKeelung20224Taiwan Center of Excellence for Ocean Engineering National Taiwan Ocean UniversityKeelung20224Taiwan.

In this article,a meshless method using the spacetime collocation for solving the two-dimensional backward heat conduction problem(BHCP)is *** spacetime collocation meshless method(SCMM)is to derive the general solutions as the basis functions for the two-dimensional transient heat equation using the separation of *** solutions of the heat conduction problem are expressed as a series using the addition *** the basis functions are the general solutions of the governing equation,the boundary points may be collocated on the spacetime boundary of the *** proposed method is verified by conducting several heat conduction *** also carry out numerical applications to compare the SCMM with other meshless *** results show that the SCMM is accurate and ***,it is found that the recovered boundary data on inaccessible boundary can be obtained with high accuracy even though the over specified data are provided only at a 1/6 portion of the spacetime boundary.

关键词： Spacetime collocation meshless method backward heat conduction problem basis functions.

Progress on deep circulation and meridional overturning circulation in the South China Sea

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Science China Earth Sciences 2016年第9期59卷 1827-1833页

作者： WANG Dongxiao xiao jingen SHU YeQiang XIE Qiang CHEN Ju WANG Qiang State Key Laboratory of Tropical Oceanography South China Sea Institute of Oceanology Chinese Academy of Sciences College of Earth Sciences University of Chinese Academy of Sciences Institute of Deep Sea Science and Engineering Chinese Academy of Sciences

The deep overflow through the Luzon Strait drives the cyclonic deep circulation in the South China Sea(SCS). In the mean time, the intruding Pacific deep water transforms and upwells due to enhanced diapycnal mixing in the SCS. Both processes greatly contribute to the SCS meridional overturning circulation(SCSMOC). At the same time, both the deep circulation and meridional overturning circulation are modulated by rough topography in the SCS. Furthermore, the spatial structure of the SCSMOC infers a link between the upper-layer circulation and deep circulation in the SCS. This paper reviews recent advances in the SCS deep circulation and meridional overturning circulation, including the driving mechanism of the SCS deep circulation and its modulation by topography, as well as the spatial structure of the SCSMOC and its dynamical mechanism.

关键词： Luzon overflow SCS deep circulation SCSMOC Topography

Analysis of deep-layer and bottom circulations in the South China Sea based on eight quasi-global ocean model outputs

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Chinese Science Bulletin 2013年第20期58卷 4000-4011页

作者： XIE Qiang xiao jingen WANG Dongxiao YU YongQiang State Key Laboratory of Tropical Oceanography South China Sea Institute of OceanologyChinese Academy of Sciences Sanya Institute of Deep Sea Science and Engineering Chinese Academy of Sciences University of the Chinese Academy of Sciences State Key Laboratory of Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric PhysicsChinese Academy of Sciences

This study is a preliminary analysis of the South China Sea(SCS)deep circulations using eight quasi-global high-resolution ocean model *** goal is to assess models’ability to simulate these deep *** analysis reveals that models’deep temperatures are colder than the observations in the World Ocean Atlas,while most models’deep salinity values are higher than the observations,indicating models’deep water is generally colder and saltier than the ***,there are long-term trends in both temperature and salinity *** Luzon Strait transport below 1500 m is 0.36 Sv when averaged for all models,smaller compared with the observation,which is about 2.5 *** assimilated models and one unassimilated(OCCAM)display that the Luzon deep-layer overflow reaches its minimum in spring and its maximum in *** vertically integrated streamfunctions below 2400 m from these models show a deep cyclonic circulation in the SCS on a large scale,but the pattern is different from the diagnostic streamfunction from the U.S Navy Generalized Digital Environment Model(GDEM-Version 3.0,GDEMv3).The meridional overturning structure above 1000 m is similar in all models,but the spatial distribution and intensity below 1500 m are quite different from model to ***,the meridional overturning below 2400 m in these models is weaker than that of the GDEMv3,which indicates a deep vertical mixing process in these models is biased *** on the above evaluation,this paper discusses the impacts of T/S initial value,topography,and mixing scheme on the SCS deep circulations,which may provide a reference for future model improvement.

关键词：海洋模型环流分析输出结果中国南海海深底层数字环境模型评估模型

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Advances in research of the mid-deep South China Sea circulation

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Science China Earth Sciences 2019年第12期62卷 1992-2004页

作者： Dongxiao WANG Qiang WANG Shuqun CAI xiaodong SHANG Shiqiu PENG Yeqiang SHU jingen xiao xiaohui XIE Zhiwei ZHANG Zhiqiang LIU Jian LAN Dake CHEN Huijie XUE Guihua WANG Jianping GAN Xinong XIE Rui ZHANG Hui CHEN Qingxuan YANG State Key Laboratory of Tropical Oceanography South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China School of Marine Science and Technology Tianjin UniversityTianjin 300072China State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of OceanographyMNRHangzhou 310012China Key Laboratory of Physical Oceanography MOEOcean University of ChinaQingdao 266003China Department of Ocean Science and Engineering Southern University of Science and TechnologyShenzhen 518055China Institute of Atmospheric Sciences Fudan UniversityShanghai 200438China Department of Mathematics and Division of Environment Hong Kong University of Science and TechnologyHong Kong 999077China College of Marine Science and Technology China University of GeosciencesWuhan 430074China College of Oceanic and Earth Xiamen UniversityXiamen 361102China

The South China Sea(SCS)is a large marginal sea connecting the Indian and Pacific *** the factors of monsoons,strait transport,and varied bathymetry,the SCS presents a three-layer structure and strong diapycnal mixing which is far greater than that in the open *** analysis and observations reveal that internal tides,internal solitary waves,and strong winds are the sources of the strong mixing in the northern SCS.A major consequence of the strong mixing is an active mid-deep circulation *** system promotes exchange of water between the SCS and adjacent oceans,and also regulates the upper layer of wind-driven circulation,making the 3 dimensional SCS circulation clearly different from that in other tropical and subtropical marginal *** mass transport capacity of the mid-deep circulation has a substantial impact on marine sedimentation,the biogeochemical cycle,and other processes in the *** paper summarizes the recent advances in middeep sea circulation dynamics of the SCS,and discusses the opportunities and challenges in this area.

关键词： Mid-deep South China Sea circulation Diapycnal mixing Multi-scale processes interaction

基于Flotherm热仿真的小型半导体温控箱系统设计与实现

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国外电子测量技术 2022年第1期41卷 93-98页

作者：肖金根肖浩刘飞飞李建光江西理工大学电气工程与自动化学院赣州341000 北京世维通光智能科技有限公司北京100084

针对小型的、有特殊控温需求的元器件,提出了一种新型的基于Flotherm热仿真设计的TEC温控系统,系统可提供一个线性变化且高精度可控的温度环境,提高了待测系统整体的温度稳定性。将半导体制冷技术、传感器技术和智能控制技术相结合,利用... 详细信息

针对小型的、有特殊控温需求的元器件,提出了一种新型的基于Flotherm热仿真设计的TEC温控系统,系统可提供一个线性变化且高精度可控的温度环境,提高了待测系统整体的温度稳定性。将半导体制冷技术、传感器技术和智能控制技术相结合,利用Flotherm热仿真软件分析得出温控箱内空间热力场分布,以此选用了相适应的圆柱体温控箱;基于PID控制算法和Labview设计上位机软件实现了自动控温技术并搭建样机,样机性能测试结果表明,在-20℃~+85℃温度区间内实现良好的自动线性控温,恒温控制精度在±0.1℃以内。

关键词：半导体制冷自动温控热仿真数据采集数字样机高精度

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黄梅尖地区铀矿勘查研究进展及找矿远景

铀矿地质 2019年第4期35卷 214-219页

作者：杨彪肖金根曹达旺刘惠华周乾安徽省核工业勘查技术总院

黄梅尖地区是长江中下游铀成矿带铀矿化集中区,也是庐枞盆地乃至安徽省铀矿地质工作的重点地区。笔者对黄梅尖地区铀矿勘查研究的历史进行了简要回顾,重点阐述了黄梅尖地区铀矿勘查研究的新进展:铀矿找矿空间由黄梅尖岩体外带地层扩大... 详细信息

黄梅尖地区是长江中下游铀成矿带铀矿化集中区,也是庐枞盆地乃至安徽省铀矿地质工作的重点地区。笔者对黄梅尖地区铀矿勘查研究的历史进行了简要回顾,重点阐述了黄梅尖地区铀矿勘查研究的新进展:铀矿找矿空间由黄梅尖岩体外带地层扩大到岩体内部;铀矿找矿深度由地表浅层到地下深层掘进;明确了黄梅尖地区铀成矿年龄存在两期;铀矿类型归属于与碱性侵入岩有关的岩浆热液型。以此展望了未来的找矿勘查研究方向。

关键词：黄梅尖岩体新进展铀矿勘查找矿方向

安徽黄梅尖岩体北缘徐村铀矿床地质特征、矿床成因及成矿模式

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华东地质 2021年第3期42卷 318-329页

作者：杨彪刘琛琛周乾张赞赞肖金根曹达旺安徽省核工业勘查技术总院安徽芜湖241002 安徽省地质调查院安徽合肥230001

徐村铀矿床位于长江中下游成矿带庐枞矿集区,属于与燕山晚期黄梅尖A型花岗岩体有关的中低温热液型矿床,矿石类型多数为长英质砂岩型铀矿石,少数为石英正长岩型铀矿石。文章基于近些年详细的野外勘查及室内研究工作,在总结该铀矿床成矿... 详细信息

徐村铀矿床位于长江中下游成矿带庐枞矿集区,属于与燕山晚期黄梅尖A型花岗岩体有关的中低温热液型矿床,矿石类型多数为长英质砂岩型铀矿石,少数为石英正长岩型铀矿石。文章基于近些年详细的野外勘查及室内研究工作,在总结该铀矿床成矿地质背景和矿床地质特征的基础上,进一步探讨铀成矿规律:岩体与地层接触界面形态及构造发育程度是控制铀矿体分布的关键因素;岩体内、外接触带是最有利的赋矿部位;铀成矿与早白垩世晚期侵入的岩浆岩关系密切。进一步探讨了该铀矿床的成矿机理,建立了徐村铀矿床成矿模式,这对丰富与A型花岗岩有关的热液型铀成矿理论,进一步探讨黄梅尖地区乃至庐枞盆地NE向A型花岗岩带的铀成矿作用、成矿类型及找矿潜力具有重要参考意义。

关键词：黄梅尖岩体徐村铀矿床成矿特征成矿模式

Efficient electrical control of magnetization switching and ferromagnetic resonance in flexible La_(0.7)Sr_(0.3)MnO_(3) films

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Nano Research 2024年第11期17卷 10017-10025页

作者： Qin Du Wenli Wang xiao Sun jingen Wu Zhongqiang Hu Bing Tian Qiancheng Lv Zhiguang Wang Ming Liu State Key Laboratory for Manufacturing Systems Engineering Electronic Materials Research Laboratory School of Electronic Science and Engineering Xi’an Jiaotong University Xi’an 710049 China John de Laeter Centre Curtin University Perth Western Australia 6102 Australia Southern Power Grid Digital Grid Research Institute Co. Ltd. Guangzhou 510700 China

Efficient electrical control of magnetic property is critical for the development of various spintronics. However, traditional magnetoelectric devices require adoption of piezoelectric component, resulting in complicated device architecture and complex conditioning circuit. More importantly, traditional strain-mediated magnetoelectric structures could not be developed in flexible form due to the existence of magnetostrictive component, which could be easily affected by mechanical deformation in flexible devices. Here we have systematically investigated pure current control of the magnetic properties of La_(0.7)Sr_(0.3)MnO_(3) thin films. Ferromagnetic to paramagnetic phase transition has been realized with a small current density of 5.2 × 10^(3) A/cm^(2), which is three orders smaller than the working current density of spintronics based on spin-orbit torque and spin-transfer torque. The effective tuning of magnetic property has been attributed to the current induced Joule heating effect. For La_(0.7)Sr_(0.3)MnO_(3) film grown on flexible Mica with a smaller thermal conductivity, dramatic change of ferromagnetic resonance field of 1340 Oe and nonvolatile magnetization switching have been achieved with an ultra-small current density of 7.4 × 10^(2) A/cm^(2). These results represent a crucial step towards effective electrical control of both static and dynamic magnetic properties in flexible magnetic thin films and open a new avenue for exploring electrical controlled flexible spintronics.

关键词： magnetoelectric flexible electronics La_(0.7)Sr_(0.3)MnO_(3) Joule heating phase transition

Development of EST-SSR markers to assess genetic diversity of Aspergillus niger causing stem rot disease in sisal

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Development of EST-SSR markers to assess genetic diversity o...