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Improved Simulation of Summer Heavy Rainfall over Beijing and Henan by the YHGSM with Updated Subgrid Orographic Parameters

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Journal of Meteorological Research 2024年第3期38卷 504-529页

作者： Yingjie WANG Jianping WU kaijun REN College of Computer Science and Technology National University of Defense TechnologyChangsha410600China College of Meteorology and Oceanography National University of Defense TechnologyChangsha410600China

In numerical weather prediction(NWP),the parameterization of orographic drag plays an important role in representing subgrid orographic *** subgrid orographic parameters are the key input to the parameterization of orographic ***,the subgrid orographic parameters in most NWP models were produced based on elevation datasets generated many years ago,with a coarse resolution and low *** this paper,using the latest high-quality elevation data and considering the applicable scale range of the subgrid orographic parameters,we construct the orographic parameters,including the subgrid orographic standard deviation,anisotropy,orientation,and slope,that are required as input to the orographic gravity wave drag(OGWD)***,we introduce the newly constructed orographic parameters into the Yin-He Global Spectral Model(YHGSM),optimize the description of the orographic effect in the model,and improve the simulation of two typical heavy rainfall events in Beijing and Henan.

关键词： subgrid orographic parameters orographic drag heavy rainfall Yin-He Global Spectral Model(YHGSM) parameterization

Experimental Study on the Molten Salt at Micron Scale during the Melting Process

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Journal of Thermal Science 2024年第1期33卷 70-85页

作者： TIAN Ziqian LIAO Zhirong XU Chao FANG Yongzhe JIANG kaijun YUAN Mengdi Key Laboratory of Power Station Energy Transfer Conversion and System Ministry of Education of ChinaSchool of Energy Power and Mechanical EngineeringNorth China Electric Power UniversityBeijing 102206China

The investigation of the melting behaviors of the molten salt at micron scale during the melting process is critical for explaining the solid-liquid phase transition *** this paper,a novel experimental system and analysis method were proposed to study the melting process with three heating rates in the range of1-10℃/min of the solar salt at micron *** solid-liquid boundary morphology and phase transition kinetics of molten salt particles were focused ***,the correlations between liquid fraction,temperature and time under different heating rates were *** solid-liquid boundary morphology was depicted by the visualized experimental set-up,and the instantaneous liquid volume fraction during the non-isothermal phase transition was ***,the correlation between temperature and liquid volume fraction was proposed to reveal the evolution of the solid-liquid boundary with temperature at different heating ***,the non-isothermal phase transition kinetic equation was established by introducing a constant parameter(V_(a,b)),and more kinetic parameters such as 1g V_(a,b) and-lg V_(a,b)/b were *** results showed that the exponent b is not sensitive to the heating rate with a range of 3-5 for solar salt ***,the heating rate influences the value of V_(a,b) and presents a positive ***,the non-isothermal phase transition kinetic equations at different heating rates in the range of 1-10℃/min can be quickly predicted by the proposed improved experimental test *** study could fill the research insufficiency and provide significant guidance for future research on the solid-liquid transition mechanism of molten salts at micron scale.

关键词： molten salt non-isothermal phase transition solid-liquid boundary morphology liquid volume fraction micron scale melting process

Heteroatom tuning in agarose derived carbon aerogel for enhanced potassium ion multiple energy storage

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Carbon Energy 2024年第3期6卷 239-254页

作者： kaijun Xie Xin Liu Haolin Li Long Fang Kai Xia Dongjiang Yang Yihui Zou Xiaodong Zhang State Key Laboratory of Bio-fibers and Eco-textiles Shandong Collaborative Innovation Center of Marine Biobased Fibers and Ecological TextilesInstitute of Marine Biobased MaterialsCollege of Chemistry and Chemical EngineeringCollege of Environmental Science and EngineeringQingdao UniversityQingdaoChina

The incorporation of heteroatoms into carbon aerogels(CAs)can lead to structural distortions and changes in active sites due to their smaller size and electronegativity compared to pure ***,the evolution of the electronic structure from single-atom doping to heteroatom codoping in CAs has not yet been thoroughly investigated,and the impact of codoping on potassium ion(K+)storage and diffusion pathways as electrode material remains *** this study,experimental and theoretical simulations were conducted to demonstrate that heteroatom codoping,composed of multiple heteroatoms(O/N/B)with different properties,has the potential to improve the electrical properties and stability of CAs compared to single-atom *** states near the Fermi level have revealed that doping with O/N/B generates a greater number of active centers on adjacent carbon atoms than doping with O and O/N *** a result of synergy with enhanced wetting ability(contact angle of 9.26°)derived from amino groups and hierarchical porous structure,ON-CA has the most optimized adsorption capacity(−1.62 eV)and diffusion barrier(0.12 eV)of K^(+).The optimal pathway of K^(+)in ON-CA is along the carbon ring with N or O *** K^(+)storage material for supercapacitors and ion batteries,it shows an outstanding specific capacity and capacitance,electrochemical stability,and rate ***,the assembled symmetrical K^(+)supercapacitor demonstrates an energy density of 51.8 Wh kg^(−1),an ultrahigh power density of 443Wkg^(−1),and outstanding cycling stability(maintaining 83.3%after 10,000 cycles in 1M KPF6 organic electrolyte).This research provides valuable insights into the design of highperformance potassium ion storage materials.

关键词： agarose carbon aerogels O/N/B codoping potassium-ion battery potassium-ion supercapacitor

Innovative Mn3-xO4-y@NCA design:Leveraging Mn/O vacancies and amorphous architecture for enhanced sodium-ion storage

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Journal of Energy Chemistry 2024年第10期97卷 747-756页

作者： kaijun Xie Xin Liu Kai Xia Lipeng Diao Ping Lu Mengmeng Wang Long Fang Yihui Zou Dongjiang Yang Xiaodong Zhang College of Chemistry and Chemical Engineering College of Environmental Science and Engineering State Key Laboratory of Bio-fibers and Eco-textiles Shandong Collaborative Innovation Center of Marine Biobased Fibers and Ecological Textiles Institute of Marine Biobased Materials Qingdao University Institute of Micro/Nano Materials and Devices Ningbo University of Technology

Manganese-based oxide electrode materials suffer from severe Jahn-Teller（J-T） distortion,leading to severe cycle instability in sodium ion ***,it is difficult to adjust the electron at d orbitals exactly to a low spin state to eliminate orbital degeneracy and suppress J-T distortion *** article constructed concentration-controllable Mn/O coupled vacancy and amorphous network in Mn3O4and coated it with nitrogen-doped carbon aerogel(Mn3-xO4-y@NCA).The existence of Mn/O vacancies has been confirmed by scanning transmission electron microscopy（STEM） and positron annihilation lifetime spectroscopy（PALS）.Atomic absorption spectroscopy（AAS） and X-ray photoelectron spectroscopy（XPS） determine the most optimal ratio of Mn/O vacancies for sodium ion storage is 1:*** functional theory（DFT） calculations prove that Mn/O coupled vacancies with the ratio of 1:2could exactly induce a low spin states and a d4electron configuration of Mn,suppressing the J-T distortion *** abundant amorphous regions can shorten the transport distance of sodium ions,increase the electrochemically active sites and improve the pseudocapacitance *** the synergetic effect of Mn/O coupled vacancies and amorphous regions,Mn3-xO4-y@NCA exhibits an energy density of 37.5 W h kg-1and an ultra-high power density of 563 W kg-1in an asymmetric *** sodium-ion batteries,it demonstrates high reversible capacity and exceptional cycling *** research presents a new method to improve the Na+storage performance in manganese-based oxide,which is expected to be generalized to other structural distortion.

关键词： Amorphous network Concentration-controllable Mn/O coupled vacancies Manganese-based metal oxide Sodium ion battery Sodium ion supercapacitor

Chemical profiling of principle active and toxic constituents in herbs containing aristolochic acids

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Chinese Herbal Medicines 2024年第2期16卷 293-300页

作者： Lijun Yue kaijun Yang Feng Jiang Shuai Dong Kang Yang Dan Zhu School of Pharmacy Minzu University of ChinaBeijing 100081China Key Laboratory of Ethnomedicine Ministry of Education Minzu University of ChinaBeijing 100081China Hospital of Minzu University of China Beijing 100081China

Objective:To clear the amounts of the principal active/toxic components in herbs containing aristolochic acids(HCAAs),which are still used as medicine and/or seasoning in many ethnic minority areas of ***:In this study,six major active and toxic components in HCAAs were extracted with ultrasonic *** 6-O-methyl guanosine as internal standard,the target compounds were analyzed qualitatively and quantitatively by using ultrahigh performance liquid chromatography-electrospray ionization-tandem mass spectrometry(UPLC-ESI-MS/MS)with multiple reaction monitoringinformation dependent acquisition-enhanced production ion scanning mode(MRM-IDA-EPI)combined with dynamic background subtraction(DBS)***:The method showed good linearity in the linear range of the six *** limit range of detection was from 0.01 ng/mL to 0.27 ng/*** of the detection repeatability,extraction repeatability and accuracy of the method were *** extraction,the samples remained stable at 15℃ within 24 *** analytes were all found in samples except aristolactam(AL)in sample 2,and the contents varied *** contents of these compounds decreased in fruits,leaves and stems of Aristolochia delavayi ***:This method has the advantages of less sample dosage,simple operation,short analysis cycle,high sensitivity,specificity and *** laid a good foundation for guiding the safety of HCAAs,the indepth study of pharmacological and toxicological effects and the scientific and standardized processing and compatibility of HCAAs.

关键词： aristolactam aristolochic acids chemical profiling herbs containing aristolochic acids ultrahigh performance liquid chromatography-electrospray ionizationtandem mass spectrometry(UPLC-ESI-MS/MS)

Limited Sea Surface Temperature Cooling due to the Barrier Layer Promoting Super Typhoon Mangkhut(2018)

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Advances in Atmospheric Sciences 2024年第11期41卷 2156-2172页

作者： Huipeng WANG Jiagen LI Junqiang SONG Liang SUN Fu LIU Han ZHANG kaijun REN Huizan WANG Chunming WANG Jinrong ZHANG Hongze LENG College of Meteorology and Oceanography National University of Defense TechnologyChangsha 410073China School of Earth and Space Sciences University of Science and Technology of ChinaHefei 230000China State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of OceanographyMinistry of Natural ResourcesHangzhou 310012China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519082China

This study investigates the impact of the salinity barrier layer(BL)on the upper ocean response to Super Typhoon Mangkhut(2018)in the western North *** the passage of Mangkhut,a noticeable increase(~0.6 psu)in sea surface salinity and a weak decrease(duced SST change can be divided into the three stages,corresponding to the variations in BL thickness and SST before,during,and after the passage of *** the pre-typhoon stage,SST slightly warmed due to the entrainment of BL warm water,which suppressed the cooling induced by surface heat fluxes and horizontal *** the forced stage,SST cooling was controlled by entrainment,and the preexisting BL reduced the total cooling by 0.89℃ d-1,thus significantly weakening the overall SST cooling induced by *** the relaxation stage,the SST cooling was primarily caused by the *** results indicate that a preexisting BL can limit typhoon-induced SST cooling by suppressing the entrainment of cold thermocline water,which contributed to Mangkhut becoming the strongest typhoon in 2018.

关键词： sea surface cooling mixed-layer depth barrier layer typhoon

一种基于新型拓扑的动态感应电能传输系统研究

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电气技术 2017年第11期18卷 75-79页

作者：余进杜凯军高世萍中车青岛四方机车车辆股份有限公司山东青岛266111

当感应电能传输(inductive power transfer,IPT)系统为轨道机车负载供电时,其发射线圈通常采用长D型结构,但D型结构作为发射线圈会产生严重的电磁干扰问题,本文利用8字型线圈结构作为发射线圈,同时考虑到利用传统D型接收线圈时,因发射... 详细信息

当感应电能传输(inductive power transfer,IPT)系统为轨道机车负载供电时,其发射线圈通常采用长D型结构,但D型结构作为发射线圈会产生严重的电磁干扰问题,本文利用8字型线圈结构作为发射线圈,同时考虑到利用传统D型接收线圈时,因发射线圈与接收线圈间的互感值变化幅度大,使得其IPT系统输出功率严重失衡甚至无功率输出,这样严重影响IPT系统的稳定运行,因此本文将DDQ型结构作为接收线圈以改善IPT系统的功率特性。最后,构建一个基于8字型发射线圈以及DDQ型接收线圈的IPT实验系统。实验验证了该方法可以有效改善其功率特性。

关键词：感应电能传输动态供电 8字型发射线圈 DDQ型接收线圈

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20世纪上半叶中国本位史学理论的形与神

四川师范大学学报（社会科学版） 2024年第5期51卷 165-172,207,208页

作者：刘开军四川师范大学历史文化与旅游学院

20世纪上半叶,经过清季“史界革命”洗礼的中国传统史学快速转向现代史学。伴随域外史学理论与方法迅猛地传入国内,中国史学界积极接纳新说,并提出了不少新理论与新观念,此举可视为域外学说的中国回响。与主要依靠吸收外来思想而构建的... 详细信息

20世纪上半叶,经过清季“史界革命”洗礼的中国传统史学快速转向现代史学。伴随域外史学理论与方法迅猛地传入国内,中国史学界积极接纳新说,并提出了不少新理论与新观念,此举可视为域外学说的中国回响。与主要依靠吸收外来思想而构建的新史学理论形态不同,陈垣、柳诒徵、刘咸炘、宋慈抱等人立足中国,从传统出发,亦曾在史学理论建设上有所作为。中国本位史学理论是指凭借中国本土学术资源,在学术立场、史学观点、著述形式和话语系统诸方面,自觉地传承传统,回应时代,具有浓郁中国传统学术风格与神韵的史学理论形态。它虽不曾主导史学潮流,却是今人绘制中国现代史学理论版图时不可或缺的一部分。中国近现代史学大致经历了一个求新求变求用的演进过程,若在古今关系的角度下观察,往往给人一种抛弃传统、跨越传统的印象。然而,他们构建中国本位史学理论的灵感仍源于传统史学,他们探讨的许多问题也能在传统史学那里找到源头,他们撰写的史学论著亦大体沿用旧有体例、语汇、文风,这些均表现出他们对中国传统史学的赓续与认同。他们对域外学术,并非闭目塞听;对旧史学,抱持一种自信与敬意。学界惯以“文化保守派”指称上述学者。在某些语境中,“保守”总被涂抹上消极、落伍的色调,同时对立着一个“先进”的他者标准。需要强调的是,刘咸炘、宋慈抱等人并非一味赞美旧史学,中国本位史学理论不是传统史学理论的现代复制品。他们不是在旧史学的王国里徘徊不前,迷失自我,而是对旧史学也执行着自觉的检讨。只有中国本位,才有真正意义上的中国化。中国本位史学理论的提出,不是要刻意拔高它的学术地位,否定在域外学术刺激下中国现代史学理论取得的成就,也不是要简单粗暴地强行回到传统中去。中国本位史学理论的成绩,从一个方面昭示着传统史学在史学近代化进程中顽强的生命力,说明旧史学与新史学之间从未截然断裂,而是始终血肉相连。如果说外部的推动是催生中国现代史学的重要力量,那么本土史学气韵的内在延续则是中国现代史学之所以为“中国”的关键因素。新时代的中国史学工作者,仍在摸索,在建设,并将在这样的学术回眸中找寻未来前行的方向与路径,自本土构建本位,由本位走向自主。

关键词：中国本位史学理论形与神陈垣柳诒徵刘咸炘宋慈抱

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新质生产力驱动乡村旅游高质量发展的机理和路径研究

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西南民族大学学报（人文社会科学版） 2024年第6期45卷 30-37页

作者：吴开军广州航海学院国际邮轮游艇学院广东广州510725

新质生产力驱动乡村旅游高质量发展包含内在机理和外在机理,内在机理表现在新质生产力对乡村旅游的影响机理及互动机理两方面,外在机理即作用机理表现在信息技术在乡村旅游中的应用、对生态农业与乡村旅游高质量融合的促进、对文化创意... 详细信息

新质生产力驱动乡村旅游高质量发展包含内在机理和外在机理,内在机理表现在新质生产力对乡村旅游的影响机理及互动机理两方面,外在机理即作用机理表现在信息技术在乡村旅游中的应用、对生态农业与乡村旅游高质量融合的促进、对文化创意产业与乡村旅游高质量融合的助力三方面。新质生产力驱动乡村旅游高质量发展的创新路径包括乡村旅游产品创新、乡村旅游服务创新、乡村旅游营销创新三方面。最后通过两个典型案例印证新质生产力对乡村旅游高质量发展的驱动效果。文章有助于更好地理解新质生产力与乡村旅游的内在关联和发展规律,更能为推动乡村旅游高质量发展提供有力的理论支持和实践指导。

关键词：新质生产力乡村旅游内在机理外在机理创新路径