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全钒液流电池多孔电极非均匀压缩的数值模拟

化工进展 2024年第6期43卷 2940-2949页

作者：王庆泰张赛王杰敏昆明理工大学机电工程学院云南昆明650500

电极压缩会导致全钒液流电池的多孔电极侵入流道影响电池性能。本文建立了蛇形流道多孔电极非均匀压缩的三维稳态模型,对比研究了多孔电极非均匀压缩和多孔电极矩形压缩的内部压降、电解质流速和过电位分布的不同,发现多孔电极非均匀压... 详细信息

电极压缩会导致全钒液流电池的多孔电极侵入流道影响电池性能。本文建立了蛇形流道多孔电极非均匀压缩的三维稳态模型,对比研究了多孔电极非均匀压缩和多孔电极矩形压缩的内部压降、电解质流速和过电位分布的不同,发现多孔电极非均匀压缩与实际情况符合程度高。分析了不同压缩比对电极非均匀压缩多孔电极内部压降、电解质速度、反应物质浓度分布、电解质电位、过电位、局部电流密度和浓差过电位的影响。结果表明:在压缩比增大的情况下,电极非均匀压缩多孔电极内部压降和速度增大程度高于电极矩形压缩,电极非均匀压缩侵入部分与流道接触区域处过电位高于电极矩形压缩。电极非均匀压缩多孔电极内部反应物质浓度分布均匀性增大,电解质电位和过电位降低,阴极区域局部电流密度和浓差过电位上升。

关键词：全钒液流电池电解液多孔电极非均匀压缩模型数值模拟

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Observational connection between local high-temperature phenomena within magnetic clouds and the Sun

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Science China Earth Sciences 2016年第5期59卷 1051-1056页

作者： wang jiemin FENG HengQiang Institute of Space Physics Luoyang Normal University

Magnetic clouds(MCs) frequently show abnormal high-ionization states of heavy ions. The abnormal high-charge distributions are related to the coronal temperature of their source regions. We examined the plasma and magnetic field data of 74 MCs observed by the Advanced Composition Explorer from February 1998 to December 2008. We determined that 14 of the 74 events showed local high-temperature phenomena. We analyzed the correlation between proton temperature and O7/O6ratio(or high mean Fe charge state ?Fe?) within the local high-temperature regions in the 14 MCs. Results show that proton temperature and O7/O6 ratio(or high mean Fe charge state) had good correlations in nine MCs, but had no evident correlation in the other five MCs. The local high-temperature phenomena within the nine MCs have resulted from the Sun.

关键词： Magnetic cloud Ion ionization state High temperature proton

积石山M6.2地震诱发秦阴村黄土震陷灾害研究

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地震工程学报 2024年第4期46卷 818-824,856页

作者：钟秀梅王平王杰民王谦胡雪枫贾世超王羿中国地震局黄土地震工程重点实验室甘肃兰州730000 甘肃省地震局甘肃兰州730000 甘肃煤田地质局甘肃兰州730000 青海大学土木水利学院青海西宁750000

2023年12月18日在甘肃省临夏州积石山县发生的M6.2地震诱发了多处黄土震陷灾害。通过对积石山县石塬镇秦阴村黄土震陷灾害进行现场调查,得出灾害的主要特征;利用原状黄土开展室内试验,研究秦阴村黄土的物性参数特征、微结构特征和震陷性... 详细信息

2023年12月18日在甘肃省临夏州积石山县发生的M6.2地震诱发了多处黄土震陷灾害。通过对积石山县石塬镇秦阴村黄土震陷灾害进行现场调查,得出灾害的主要特征;利用原状黄土开展室内试验,研究秦阴村黄土的物性参数特征、微结构特征和震陷性,结合现场调查结果分析震陷灾害产生的主要原因。研究结果表明:秦阴村震陷区内土体酥裂,裂缝发育,边缘土体坍落或产生滑坡;土层呈反倾台阶状震裂破坏,最大沉降量57 cm,裂缝最大长度约300 m,宽度约83 cm。震陷区黄土土质疏松、含水率较高、架空孔隙发育、颗粒胶结较弱,具备产生震陷的土性条件。震陷区黄土层厚度较大,地震的等效动应力大于土体产生震陷的临界动应力,且地震动持续时间较长、卓越周期较大,使得场地产生了严重的震陷破坏。

关键词：场地地震效应沉降裂缝崩滑动三轴试验微结构

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Small interplanetary magnetic flux rope

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Science China(Technological Sciences) 2020年第2期63卷 183-194页

作者： FENG HengQiang ZHAO GuoQing wang jiemin Institute of Space Physics Luoyang Normal UniversityLuoyang 471934China Henan Key Laboratory of Electromagnetic Transformation and Detection Luoyang Normal UniversityLuoyang 471934China

Small interplanetary magnetic flux ropes(SIMFRs) are often detected by space satellites in the interplanetary space near 1 *** ropes can be fitted by a cylindrically symmetric magnetic model. The durations of SIMFRs are usually 700 km/s). Some SIMFRs demonstrate abnormal heavy ion compositions, such as abnormally high He abundance, abnormally high average iron ionization, and enhanced O7+abundance. These SIMFRs originate from remarkably hot coronal origins. Approximately 74.5% SIMFRs exhibit counterstreaming suprathermal electron signatures. Given their flux rope configuration, SIMFRs are potentially more effective for substorms. SIMFRs and magnetic clouds have many similar observational properties but also show some different *** similar properties may indicate that SIMFRs are the interplanetary counterparts of small coronal mass ejections. Some direct bodies of evidence have confirmed that several SIMFRs are interplanetary counterparts of CMEs. However, their different properties may imply that some SIMFRs have interplanetary origins. Therefore, one of the main aims of future research on SIMFRs is to determine whether SIMFRs originate from two different sources, that is, some events are formed in the solar coronal atmosphere, whereas others originate from the interplanetary space. Finally, in this paper, we offer some prospects that should be addressed in the future.

关键词： magnetic flux ropes magnetic cloud coronal mass ejection heliospheric current sheet

A temperature prediction-correction method for estimating surface soil heat flux from soil temperature and moisture data

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Science China Earth Sciences 2008年第5期51卷 721-729页

作者： Kun Yang jiemin wang Institute of Tibetan Plateau Research Chinese Academy of Sciences Beijing 100085 China Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences Lanzhou 73000 China

Surface soil heat flux is a component of surface energy budget and its estimation is needed in land-atmosphere interaction studies. This paper develops a new simple method to estimate soil heat flux from soil temperat... 详细信息

关键词： soil heat flux thermal conductivity temperature correction heat-plate

Local high-temperature phenomena within magnetic clouds

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Science China Earth Sciences 2021年第1期64卷 177-184页

作者： jiemin wang Hengqiang FENG Hongbo LI Yan ZHAO Institute of Space Physics Luoyang Normal UniversityLuoyang 471934China Henan Key Laboratory of Electromagnetic Transformation and Detection Luoyang Normal UniversityLuoyang 471934China

In this study,three methods were used to analyze 17 large-scale local high-temperature regions with durations exceeding 2 h within magnetic clouds(MCs)observed by advanced composition explorer from 1998 to *** show that five of these large-scale regions may have been caused by flare heating;seven of the regions may have been caused by nonuniform expansion when MCs propagated in the solar-terrestrial space;four large-scale high temperature regions may likely result from combined non-uniform expansion and flare heating;and only one large-scale local high-temperature region was not related to either flare heating nor non-uniform *** evidence indicated that magnetic reconnection occurred or had occurred within the high-temperature *** on our results,we infer that such local high-temperature phenomena within MCs are caused primarily as a result of flare heating and non-uniform expansion,either separately or jointly,and that magnetic reconnection plays only a minor role in the formation of high-temperature regions.

关键词： Magnetic cloud High-temperature regions Flare heating Non-uniform expansion

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最有利于未成年人原则的立法缺憾与完善建议

预防青少年犯罪研究 2024年第2期 51-58页

作者：王杰民罗建武河南省周口市人民检察院河南周口466799

全面修订的《未成年人保护法》从立法上确立了本土化的最有利于未成年人原则,其具有逻辑结构相对完善的“1+4+6”的立法表达体系。但也应当看到,最有利于未成年人原则存在概念内涵模糊、责任路径不明确、具体要求位阶混乱等立法不足。... 详细信息

全面修订的《未成年人保护法》从立法上确立了本土化的最有利于未成年人原则,其具有逻辑结构相对完善的“1+4+6”的立法表达体系。但也应当看到,最有利于未成年人原则存在概念内涵模糊、责任路径不明确、具体要求位阶混乱等立法不足。鉴于此,围绕未成年人的地位独立、优先保障、有效参与、全面发展等实质核心范畴,最有利于未成年人原则的未来立法完善,应当从以下几个方面着手:一是概念的相对性明确;二是责任路径的法治化明确;三是权利落实的重点化保障;四是附属立法的协调性提升。

关键词：最有利于未成年人原则儿童优先儿童独立儿童参与权利责任论

我国轻罪前科消灭制度构建的理论证成与具体方案

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河南警察学院学报 2024年第2期33卷 46-53页

作者：张素敏王杰民西南政法大学重庆401120 周口市淮阳区人民检察院河南周口466733

为实现对轻罪的科学治理,贯彻宽严相济的刑事政策,消除前科制度的固有弊端,有必要构建轻罪前科消灭制度。在宏观层面可从罪刑均衡原则、罪责自负原则和人身危险性原理三方面夯实构建我国轻罪前科消灭制度的理论根基。在微观层面则要合... 详细信息

为实现对轻罪的科学治理,贯彻宽严相济的刑事政策,消除前科制度的固有弊端,有必要构建轻罪前科消灭制度。在宏观层面可从罪刑均衡原则、罪责自负原则和人身危险性原理三方面夯实构建我国轻罪前科消灭制度的理论根基。在微观层面则要合理划定轻罪前科消灭的适用范围,即被判处3年以下有期徒刑、拘役、管制或单处附加刑,或定罪免刑、单纯宣告有罪;科学进行程序设计,建立依申请或依职权的“或选”模式,并由法院参考检察院、司法局等单位的意见作出是否消灭前科的裁决;加强配套制度的衔接:建立司法数据与人事档案、户籍信息平台共享机制,及时删除符合条件的前科信息。应将轻罪前科消灭作为社会矫正的鼓励手段,不断降低社矫对象的再犯罪率,真正实现其再社会化。

关键词：轻罪前科消灭前科消灭制度

Two-dimensional Boron Nitride for Electronics and Energy Applications

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Energy & Environmental Materials 2022年第1期5卷 10-44页

作者： jiemin wang Liangzhu Zhang Lifeng wang Weiwei Lei Zhong-Shuai Wu School of New Energy and Materials Southwest Petroleum UniversityChengdu Sichuan 610500China State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China Institute for Frontier Materials Deakin UniversityWaurn Ponds CampusLocked Bag 20000Geelong Vic.3220Australia Dalian National Laboratory for Clean Energy Chinese Academy of Sciences457 Zhongshan RoadDalian 116023China

Two-dimensional(2D)boron nitride(BN),the so-called“white graphene,”has demonstrated a great potential in various fields,particularly in electronics and energy,by utilizing its wide bandgap(~5.5 eV),superior thermal stability,high thermal conductance,chemical inertness,and outstanding dielectric ***,to further optimize the performances from the view of structure-property relationship,the determinative factors such as crystallite sizes,layer thickness,dispersibility,and surface functionalities should be precisely controlled and ***,in this review,the synthesis and functionalization methods including“top-down”and“bottom-up”strategies,and non-covalent and covalent modifications for 2D BN are systematically classified and discussed at first,thus catering for the requirements of versatile ***,the progresses of 2D BN applied in the fields of microelectronics such as fieldeffect transistors and dielectric capacitors,energy domains such as thermal energy management and conversion,and batteries and supercapacitors are summarized to highlight the importance of 2D ***,these contents not only contain the state-of-the-art 2D BN composites,but also bring the current novel design of 2D BN-based microelectronic ***,the challenges and perspectives are proposed to better broaden the scope of this ***,this review will pave an all-around way for understanding,utilizing,and applying 2D BN in future electronics and energy applications.

关键词： boron nitride electronics energy functionalization nanosheets two-dimensional materials