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金融产业集聚与绿色经济增长的关系研究--基于PVAR模型

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市场周刊 2024年第10期37卷 50-54页

作者：刘海文澳门城市大学商学院中国澳门999079

文章基于我国2009-2021年30个省区市的面板数据,并运用面板向量自回归(PVAR)模型探究我国金融产业集聚与绿色经济增长的关系,进一步分析区域异质性。实证研究发现,在全国样本数据中金融产业集聚水平对绿色经济增长具有显著的负向影响,... 详细信息

文章基于我国2009-2021年30个省区市的面板数据,并运用面板向量自回归(PVAR)模型探究我国金融产业集聚与绿色经济增长的关系,进一步分析区域异质性。实证研究发现,在全国样本数据中金融产业集聚水平对绿色经济增长具有显著的负向影响,同时绿色经济增长对金融产业集聚呈现先抑制、再促进、再抑制的“S”形影响。此外,异质性分析发现东部、中部和西部地区两个变量之间的冲击影响与贡献度也各有不同。

关键词：金融产业集聚绿色经济增长区域差异

Effective spin dephasing mechanism in confined two-dimensional topological insulators

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Science China(Physics,Mechanics & Astronomy) 2016年第7期59卷 70-75页

作者： JunJie Qi haiwen liu Hua Jiang XinCheng Xie Institute of Physics Chinese Academy of Sciences Beijing 100190 China Center for Advanced Quantum Studies Department of Physics Beijing Normal University Beijing 100875 China College of Physics optoelectronics and Energy Soochow University Suzhou 215006 China International Center for Quantum Materials and School of Physics Peking University Beijing 100871 China Collaborative Innovation Center of Quantum Matter Beijing 100871 China

A Kramers pair of helical edge states in quantum spin Hall effect （QSHE） is robust against normal dephasing but not robust to spin dephasing. In our work, we provide an effective spin dephasing mechanism in the puddles of two-dimensional （2D） QSHE, which is simulated as quantum dots modeled by 2D massive Dirac Hamiltouian. We demonstrate that the spin dephasing effect can originate from the combination of the Rashba spin-orbit coupling and electron-phonon interaction, which gives rise to inelastic backscattering in edge states within the topological insulator quantum dots, although the time-reversal symmetry is preserved throughout. Finally, we discuss the tunneling between extended helical edge states and local edge states in the QSH quantum dots, which leads to backscattering in the extended edge states. These results can explain the more robust edge transport in InAs/GaSb QSH systems.

关键词： quantum spin Hall effect bound helical states spin dephasing Rashba spin-orbit coupling electron-phonon interaction

Impact of 1.5°C and 2.0°C global warming on aircraft takeoff performance in China

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Science Bulletin 2018年第11期63卷 700-707页

作者： Tianjun Zhou Liwen Ren haiwen liu Jingwen Lu LASG Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China University of Chinese Academy of Sciences Beijing 100049China Department of Aviation Meteorology Civil Aviation University of ChinaTianjin 300300China

Associated with global warming, climate extremes such as extreme temperature will significantly increase. Understanding how climate change will impact the airflights is important to the planning of future flight operations. In this study, the impacts of 1.5 and 2 degree's global warming on the aircraft takeoff performance in China are investigated using a unique climate projection data from an international collaboration project named HAPPI. It is found that the mean summer daily maximum temperature, which is a major factor that affects the flight through changing the aircraft's takeoff weight, will increase significantly with magnitude less than 1.5℃ over most parts of China except for the Tibetan Plateau. The half a degree additional global warming will lead to higher extreme temperature in the arid and semi-arid western China, the Tibetan Plateau and the northeastern China, while the change in eastern China is weak. Five airports including Beijing, Shanghai, Kunming, Lasa and Urumqi will see ～1.0°-2.0℃(1.4°-3.0℃) higher daily maximum temperature under 1.5℃(2.0℃) scenario. The half-degree additional warming will lead to a shift toward higher extreme temperature in these five sites. For both1.5° and 2.0℃ scenarios, the number of weight-restriction days will increase significantly at 3 airports including Beijing, Shanghai, and Lasa. Urumqi will witness an increase of weight-restriction days only in 2.0℃ future.

关键词： Extreme temperature 1.5 and 2 degree's global warming Airflight Weight-restriction days

Log-periodic quantum oscillations in topological or Dirac materials

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Frontiers of physics 2019年第2期14卷 39-43页

作者： Huichao Wang Yanzhao liu haiwen liu Jian Wang International Center for Quantum Materials School of PhysicsPeking UniversityBeijing 100871China Collaborative Innovation Center of Quantum Matter Beijing 100871China Department of Applied Physics The Hong Kong Polytechnic UniversityKowloonHong KongChina Center for Advanced Quantum Studies Department of PhysicsBeijing Normal UniversityBeijing 100875China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of SciencesBeijing 100190China

As a manifestation of the underlying physical nature, quailtum oscillations with the applied magnetic field (B) are one of the most important topics in condensed matter physics. The research history can be tracked to 1930 when Lev Shubnikov and W. J. de Haas observed Shubnikov-de Haas (SdH) oscillations in the magnetoresistance (MR) of bismuth crystals. Since then, researchers have observed quantum oscillations in diverse materials, including metals, metallic compounds, semimetals, semiconductors and even insula tors, as well as in artificial mesoscopic microstructures . Nowadays, quantum oscillation detec ted by magneto transport investigation has been a powerful tool to detect the physical properties in solid-state systems.

关键词： Dirac materials Log-periodic quantum oscillations magnetoresistance (MR)

Amplification of the Solar Signal in the Summer Monsoon Rainband in China by Synergistic Actions of Different Dynamical Responses

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Journal of Meteorological Research 2017年第1期31卷 61-72页

作者： Liang ZHAO Jingsong WANG haiwen liu Ziniu XIAO State Key Laboratory of Numerical Modeling for Atmosphere Sciences and Geophysical Fluid Dynamics Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 National Climate Center China Meteorological Administration Beijing 100081 China National Center for Space Weather Beijing 100081 Department of Aviation Meteorology Civil Aviation University of China Tianjin 300300

A rainband meridional shift index （RMSI） is defined and used to statistically prove that the East Asian summer monsoon rainband is usually significantly more northward in the early summer of solar maximum years than that of solar minimum years. By applying continuous wavelet transform, cross wavelet transform, and wavelet coherence, it is found that throughout most of the 20th century, the significant decadal oscillations of sunspot number （SSN） and the RMSI are phase-locked and since the 1960s, the SSN has led the RMSI slightly by approximately 1.4 yr. Wind and Eliassen-Palm （EP） flux analysis shows that the decadal meridional oscillation of the June rainband likely re- sults from both a stronger or earlier onset of the tropical monsoon and poleward shift of the subtropical westerly jet in high-solar months of May and June. The dynamical responses of the lower tropical monsoon and the upper subtropical westerly jet to the 11-yr solar cycle transmit bottom-up and top-down solar signals, respectively, and the synergistic actions between the monsoon and the jet likely amplify the solar signal at the northern boundary of the monsoon to some extent.

关键词： solar cycle rainband East Asian summer monsoon decadal variability EP flux precipitation

Double-frequency Aharonov-Bohm effect and non-Abelian braiding properties of Jackiw-Rebbi zero-mode

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National Science Review 2020年第3期7卷 572-578页

作者： Yijia Wu haiwen liu Jie liu Hua Jiang X.C.Xie International Center for Quantum Materials School of Physics Peking University Beijing Academy of Quantum Information Sciences Center for Advanced Quantum Studies Department of Physics Beijing Normal University School of Physical Science and Technology Soochow University Department of Applied Physics School of ScienceXi'an Jiaotong University CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences

Ever since its first proposal in 1976, Jackiw-Rebbi zero-mode has been drawing extensive attention for its charming properties including charge fractionalization, topologically protected zero-energy and possible non-Abelian statistics. We investigate these properties through the Jackiw-Rebbi zero-modes in quantum spin Hall insulators. Though charge fractionalization is not manifested, Jackiw-Rebbi zero-mode’s zero-energy nature leads to a double-frequency Aharonov-Bohm effect, implying that it can be viewed as a special case of Majorana zero-mode without particle-hole symmetry. Such relation is strengthened for Jackiw-Rebbi zero-modes also exhibiting non-Abelian properties in the absence of ***, in the condition that the degeneracy of Jackiw-Rebbi zero-modes is lifted, we demonstrate a novel non-Abelian braiding with continuously tunable fusion rule, which is a generalization of Majorana zero-modes’ braiding properties.

关键词： Jackiw-Rebbi zero-mode Aharanov-Bohm effect non-Abelian statistics Majorana zero-mode

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不同卷烟机型质量保障能力对比研究

质量与认证 2024年第4期 72-73页

作者：姚林锋刘海文刘东升陕西中烟工业有限责任公司延安卷烟厂

目前,卷烟工业企业普遍使用ZJ19和ZJ118两种卷烟机型,本文通过对比同批次烟丝、不同卷烟机型卷制的烟支质量指标的检测数据得出,ZJ118型卷烟机组卷制烟支的重量标准偏差、吸阻标准偏差和硬度标准偏差均优于ZJ19型卷烟机组。因此,ZJ118... 详细信息

目前,卷烟工业企业普遍使用ZJ19和ZJ118两种卷烟机型,本文通过对比同批次烟丝、不同卷烟机型卷制的烟支质量指标的检测数据得出,ZJ118型卷烟机组卷制烟支的重量标准偏差、吸阻标准偏差和硬度标准偏差均优于ZJ19型卷烟机组。因此,ZJ118型卷烟机组具有更高的质量保障能力。

关键词：卷烟机烟丝结构烟支物理指标

TSDF教学模式在全科口腔住培教学中的应用

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中国继续医学教育 2024年第16期16卷 172-176页

作者：谭婧玉于洋刘海文锦州医科大学附属第一医院口腔门诊辽宁锦州121000 锦州医科大学附属第一医院学科科研部辽宁锦州121000

口腔医学是一门注重实践和操作的学科,对于医生们的临床思维、操作技能和医患沟通能力有着极高的要求。住培学员的学习重点在于如何帮助他们在短时间内提高诊治口腔科常见疾病的能力,开展讨论-示范-实践-反馈(tell-show-do-feedback,TS... 详细信息

口腔医学是一门注重实践和操作的学科,对于医生们的临床思维、操作技能和医患沟通能力有着极高的要求。住培学员的学习重点在于如何帮助他们在短时间内提高诊治口腔科常见疾病的能力,开展讨论-示范-实践-反馈(tell-show-do-feedback,TSDF)教学模式,将有助于住培学员的培养。将TSDF教学模式引入全科口腔住培学员的教学中也是教育的内在要求。开展TSDF教学模式对住培学员及带教老师都提出了更高的要求。TSDF教学模式是指通过理论讲授、临床示教、实践考核、反馈总结4个方面进行。TSDF教学模式可以充分提升住院医师的主动学习能力和综合诊疗能力,在全科口腔规范化培训中具有较好的应用前景。

关键词：讨论—示范—实践—反馈教学模式全科口腔住院医师规范化培训诊疗能力医学教育

The strengthening East Asia summer monsoon since the early 1990s

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Chinese Science Bulletin 2012年第13期57卷 1553-1558页

作者： liu haiwen ZHOU TianJun ZHU YuXiang LIN YiHua Plateau Atmosphere and Environment Key Laboratory of Sichuan Province College of Atmospheric SciencesChengdu University of Information TechnologyChengdu 610225China State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Chongqing Institute of Meteorological Sciences Chongqing 401147China China Meteorological Administration Training Centre Beijing 100081China

Previous studies have documented a weakening tendency of the East Asian summer monsoon (EASM) since the end of the 1970s. In this study, we report that the EASM has been recovering since the early 1990s, although its strength is still less than in previous decades (averaged over the period 1965-1980). Following the recovery of the EASM, there has been a tendency in the last decade toward northward-moving rainbands and excessive rainfall in the Huaihe River valley (110°-120°E, 30°-35°N). There is evidence suggesting that the strengthening EASM since the early 1990s is linked to interdecadal change of land-sea thermal contrast.

关键词：东亚夏季风年代际变化夏季季风淮河流域平均值雨带