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Atomic-resolution Interfacial Microstructure and Thermo-electro-magnetic Energy Conversion Performance of Gd/Bi0.5Sb1.5Te3 Composites

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Energy & Environmental Materials 2024年第4期7卷 355-363页

作者： Chengshan Liu Wenjie Xu Ping Wei Shaoqiu Ke wenjun cui Longzhou Li Dong Liang Xianfeng Ye Tiantian Chen Xiaolei Nie Wanting Zhu Wenyu Zhao Qingjie Zhang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory

Thermo-electro-magnetic materials with simultaneously large magnetocaloric(MC) and thermoelectric (TE) effects are the core part for designing TE/MC all-solid-state cooling *** MC phase with TE material is an effective ***,the elemental diffusion and chemical reaction occurring at the two-phase interfaces could significantly impair the cooling performance.

关键词： interfacial reaction magnetocaloric performance thermoelectric performance thermo-electro-magnetic materials

湖北新基建发展潜力的全国方位、空间差异和演进趋势

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湖北社会科学 2024年第1期 125-137页

作者：崔文俊江汉大学商学院湖北武汉430056

基于新基建发展潜力指标体系,采用熵值法测算2010—2021年30个省份及湖北12个城市的新基建发展潜力指数,针对性分析湖北新基建发展潜力的全国方位。运用Dagum基尼系数及其分解法对湖北及各地区新基建发展潜力的区域差异进行测度和分解,... 详细信息

基于新基建发展潜力指标体系,采用熵值法测算2010—2021年30个省份及湖北12个城市的新基建发展潜力指数,针对性分析湖北新基建发展潜力的全国方位。运用Dagum基尼系数及其分解法对湖北及各地区新基建发展潜力的区域差异进行测度和分解,基于方差分解模型从结构视角探讨湖北新基建发展潜力内部结构差异来源,利用Kernel密度估计和Markov链分析湖北及各地区新基建发展潜力的分布动态演进趋势。研究表明:湖北新基建发展潜力在全国处于中流水平。湖北省域四大地区内差异存在区域异质性,且呈分层收敛的形态。湖北新基建发展潜力总体差异呈现出阶梯式上升,前期稳定,后期波动加大的趋势。四大地区新基建发展潜力的空间差异主要来源于区域间差异,其次是区域内差异,超变密度贡献度最小。湖北新基建发展潜力差异的主要结构来源随时间推移而有所变换。四大地区新基建发展潜力差异的主要结构差异来源存在区域异质性。湖北总体分布曲线存在由“双峰(主峰+侧峰)”的形态演变,分布曲线中心位置和变化区域近年有左移的趋势。不同状态地区之间流动性较低。

关键词：湖北新基建空间差异动态演进 Dagum基尼系数

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GIS内触头过热的无线感知系统研制

高压电器 2024年第5期60卷 31-38,45页

作者：李爽鲁旭臣唐红唐佳能崔文军国网辽宁省电力有限公司电力科学研究院沈阳110006

为了实现72.5 kV及以上电压GIS内触头温度的无线感知,文中阐述了一套GIS内触头温度无线感知系统的设计思路,并进行了研制。通过功能性试验,验证了本系统的有效性和可行性。最后,建立了252 kV GIS角型隔离开关接触良好和接触不良工况模型... 详细信息

为了实现72.5 kV及以上电压GIS内触头温度的无线感知,文中阐述了一套GIS内触头温度无线感知系统的设计思路,并进行了研制。通过功能性试验,验证了本系统的有效性和可行性。最后,建立了252 kV GIS角型隔离开关接触良好和接触不良工况模型,开展了一系列局部过热无线感知试验。试验数据与热电偶测试数据进行了对比,验证了本系统的可信性。试验结果表明:本系统能够实现GIS内部触头温度的无线感知;当接触电阻Rj>250μΩ,动触头及静触头座的温度上升较快;当Rj达到620μΩ,负荷电流600 A时,静触头座的温度已接近50℃,可勉强通过红外成像检出;当Rj达到1.8 mΩ,负荷电流大于400 A时,触头的温度一直在增长,可通过红外成像清晰检测。

关键词： GIS内触头无线感知局部过热红外成像接触电阻

血栓弹力图在多次输血住院重症患者临床合理用血中的应用效果

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临床研究 2024年第7期32卷 8-11页

作者：谢小红张蕾崔文君天水市第一人民医院输血科甘肃天水741000

目的探究血栓弹力图在多次输血住院重症患者临床合理用血中的应用效果。方法选取天水市第一人民医院在2022年3月至2023年3月收治的有大量输血可能的200例住院重症患者,按照随机数字表法,将患者等量随机分为两组,对照组给予常规凝血功能... 详细信息

目的探究血栓弹力图在多次输血住院重症患者临床合理用血中的应用效果。方法选取天水市第一人民医院在2022年3月至2023年3月收治的有大量输血可能的200例住院重症患者,按照随机数字表法,将患者等量随机分为两组,对照组给予常规凝血功能检查,观察组采用常规凝血功能联合血栓弹力图检查。比较两组输血成分和输血量指标,评估两组患者输血后的凝血功能。观察两组患者使用血制品的情况以及输血前后血栓弹力图的R值、K值、α角度以及最大振幅(MA值)。结果两组患者治疗中新鲜冰冻血浆、冷沉淀、血小板输血例数比较,差异无统计学意义(P>0.05)。治疗后,观察组凝血酶原时间(PT)、活化部分凝血活酶时间(APTT)、凝血酶时间(TT)高于对照组,血浆纤维蛋白原(FIB)低于对照组,差异有统计学意义(P<0.05),观察组血浆、红细胞悬液平均使用量低于对照组,血小板、冷沉淀平均使用量高于对照组,差异有统计学意义(P<0.05)。观察组输血后R值、K值均低于输血前,α角度大于输血前,MA值高于输血前,差异有统计学意义(P<0.05)。结论血栓弹力图在多次输血住院重症患者的血液管理中发挥了重要的作用,能够为患者的合理用血提供参考,并对输血效果进行检验,为临床中血液的合理应用提供了保障。

关键词：血栓弹力图多次输血住院重症患者临床合理用血

Notes in accordions-organized MXene equipped with CeO_(2) for synergistically adsorbing and catalyzing polysulfides for high-performance lithium-sulfur batteries

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Journal of Energy Chemistry 2022年第7期31卷 502-510,I0013页

作者： Xiaochuan Chen Libo Li Yuhang Shan Da Zhou wenjun cui Yangmingyue Zhao School of Materials Science and Chemical Engineering Harbin University of Science and TechnologyHarbin 150040HeilongjiangChina

Limited by the shuttle effect, the application of lithium-sulfur batteries is not impressive. As an organ layered two-dimensional(2D) material, MXene has a great electrical conductivity and high specific surface area. Meanwhile, the introduction of metal oxides can restrain the shuttle effect. Hence, this paper prepared CeO_(2)/MXene as a cathode material of Li-S batteries. Ce and Ti can chemically adsorb S, and the interlayer structure of MXene can limit S while the interlayer space can alleviate volume *** discharge capacity at 0.5 C is as high as 1051.1 m Ah g^(-1), and 921.9 m Ah g^(-1) after 200 cycles. The average coulombic efficiency is 97.75%. The organized MXene with CeO_(2) like notes in accordions are new efficient materials for lithium-sulfur batteries.

关键词： Cooperative effects MXene CeO_(2) Kinetics Lithium-sulfur batteries

Atomic defects,functional groups and properties in MXenes

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Chinese Chemical Letters 2021年第1期32卷 339-344页

作者： wenjun cui Zhi-Yi Hu Raymond RUnocic Gustaaf Van Tendeloo Xiahan Sang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China NRC(Nanostructure Research Centre) Wuhan University of TechnologyWuhan 430070China Center for Nanophase Materials Sciences Oak Ridge National LaboratoryOak RidgeTN 37831United States EMAT(Electron Microscopy for Materials Science) University of AntwerpAntwerpB-2020Belgium

MXenes,a new family of functional two-dimensional(2 D) materials,have shown great potential for an extensive variety of applications within the last *** defects and functional groups in MXenes are known to have a tremendous influence on the functional *** this review,we focus on recent progress in the characterization of atomic defects and functional group chemistry in MXenes,and how to control them to directly influence various properties(e.g.,electron transport,Li^(+) adsorption,hydrogen evolution reaction(HER) activity,and magnetism) of 2 D MXenes *** structural transformations such as oxidation and growth induced by atomic defects in MXenes are also *** review thus provides perspectives on property optimization through atomic defect engineering,and bottom-up synthesis methods based on defect-assisted homoepitaxial growth of MXenes.

关键词： MXenes Atomic defects Surface functional groups Electron microscopy Functional properties

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环形双圆弧防飘罩盖设计与防飘性能参数优化

中国农机化学报 2024年第10期45卷 86-93页

作者：张宝川赵建国马志凯尤广宇王春伟崔文君河北农业大学机电工程学院河北保定071000 保定市农机工作站河北保定071000 易县农业农村局河北保定071004 河北凯安农业机械制造有限公司河北保定071000

为减少农药施用量,提高农药利用率,优化设计一种环形双圆弧式防飘罩盖。采用有限元ANSYS FLUENT软件对环形双圆弧式罩盖喷雾流场进行仿真模拟试验,得到其连续相流场的速度矢量分布和离散相运动轨迹。以雾滴沉积率作为试验指标,通过单因... 详细信息

为减少农药施用量,提高农药利用率,优化设计一种环形双圆弧式防飘罩盖。采用有限元ANSYS FLUENT软件对环形双圆弧式罩盖喷雾流场进行仿真模拟试验,得到其连续相流场的速度矢量分布和离散相运动轨迹。以雾滴沉积率作为试验指标,通过单因素和多因素仿真试验获得罩盖的最优结构参数组合为罩盖入口高度48.74 mm、出口长度15.11 mm、喷头距出口平面高度32.53 mm;在最优组合下其雾滴沉积率为68.8%。喷雾台试验对比五种风速下(1 m/s、2 m/s、3 m/s、4 m/s、5 m/s)罩盖喷雾和常规无罩盖喷雾的雾滴沉积率。结果表明,罩盖喷雾的雾滴沉积率分别为80.58%、75.57%、65.16%、59.47%、54.29%,分别高于常规喷雾的72.42%、61.24%、45.1%、38.34%、32.08%,罩盖喷雾较常规无罩盖喷雾有较好的防飘效果。

关键词：喷雾环形双圆弧式防飘罩盖 FLUENT仿真农药

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The anisotropy of suprathermal electrons in the Martian ionosphere

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Earth and Planetary Physics 2024年第3期8卷 459-471页

作者： YuTian Cao Jun cui XiaoShu Wu wenjun Liang RuiQi Fu HaoYu Lu Planetary Environmental and Astrobiological Research Laboratory(PEARL) School of Atmospheric SciencesSun Yat-sen UniversityZhuhai 519082China Key Laboratory of Geospace Environment University of Science&Technology of ChinaChinese Academy of SciencesHefei 230026China Center for Excellence in Comparative Planetology Chinese Academy of SciencesHefei 230026China School of Space and Environment Beihang UniversityBeijing 102206China

Suprathermal electrons are an important population of the Martian ionosphere, either produced by photoionization of atmospheric neutrals or supplied from the Solar Wind (SW). This study is dedicated to an in-depth investigation of the pitch angle distribution of suprathermal electrons at two representative energies, 19−55 eV and 124−356 eV, using the extensive measurements made by the Solar Wind Electron Analyzer on board the Mars Atmosphere and Volatile Evolution. Throughout the study, we focus on the overall degree of anisotropy, defined as the standard deviation of suprathermal electron intensity among different directions which is normalized by the mean omni-directional intensity. The available data reveal the following characteristics: (1) In general, low energy electrons are more isotropic than high energy electrons, and dayside electrons are more isotropic than nightside electrons;(2) On the dayside, the anisotropy increases with increasing altitude at low energies but remains roughly constant at high energies, whereas on the nightside, the anisotropy decreases with increasing altitude at all energies;(3) Electrons tend to be more isotropic in strongly magnetized regions than in weakly magnetized regions, especially on the nightside. These observations indicate that the anisotropy is a useful diagnostic of suprathermal electron transport, for which the conversion between the parallel and perpendicular momenta as required by the conservation of the first adiabatic invariant, along with the atmospheric absorption at low altitudes, are two crucial factors modulating the observed variation of the anisotropy. Our analysis also highlights the different roles on the observed anisotropy exerted by suprathermal electrons of different origins.

关键词： Mars ionosphere suprathermal electron pitch angle distribution

Femtosecond laser fabrication of 3D vertically aligned micro-pore network on thick-film Li_(4)Ti_(5)O_(12)electrode for high-performance lithium storage

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Journal of Energy Chemistry 2024年第8期95卷 250-262,I0006页

作者： Quansheng Li Xiaofei Sun Xuesong Mei Lingzhi Wang Minxing Yang Jianlei cui wenjun Wang State Key Laboratory for Manufacturing System Engineering Xi'an Jiaotong UniversityXi'an 710049ShaanxiChina Shaanxi Key Laboratory of Intelligent Robots Xi'an Jiaotong UniversityXi'an 710049ShaanxiChina School of Mechanical Engineering Xi'an Jiaotong UniversityXi'an 710049ShaanxiChina

The development of energy storage devices with high energy density relies heavily on thick film electrodes,but it is challenging due to the limited ion transport kinetics inherent in thick ***,we report on the preparation of a directional vertical array of micro-porous transport networks on LTO electrodes using a femtosecond laser processing strategy,enabling directional ion rapid transport and achieving good electrochemical performance in thick film *** three-dimensional(3D)vertically aligned micro-pore networks are innovatively designed,and the structure,kinetics characteristics,and electrochemical performance of the prepared ion transport channels are analyzed and discussed by multiple characterization and testing ***,the rational mechanisms of electrode performance improvement are studied experimentally and simulated from two aspects of structural mechanics and transmission *** ion diffusion coefficient,rate performance at 60 C,and electrode interface area of the laser-optimized 60-15%micro-porous transport network electrodes increase by 25.2 times,2.2 times,and 2.15 times,respectively than those of untreated ***,the preparation of 3D micro-porous transport networks by femtosecond laser on ultra-thick electrodes is a feasible way to develop high-energy *** addition,the unique micro-porous transport network structure can be widely extended to design and explore other high-performance energy materials.

关键词： Femtosecond laser Micro-porous transport networks Laser processing Thick film electrodes Ion transport kinetics