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Persistence of charge density wave against variation of band structures in V_(x)Ti_(1−x)Se_(2)(x=0–0.1)

Nano Research 2024年第3期17卷 2129-2135页

作者： Zhanfeng Liu Tongrui Li Wen Zhu hongwei shou Mukhtar Lawan Adam Qilong Cui Yuliang Li Sheng Wang Yunbo Wu Hongen Zhu Yi Liu Shuangming Chen Xiaojun Wu Shengtao Cui Li Song Zhe Sun National Synchrotron Radiation Laboratory CAS Center for Excellence in NanoscienceUniversity of Science and Technology of ChinaHefei 230029China CAS Key Laboratory of Strongly-coupled Quantum Matter Physics University of Science and Technology of ChinaHefei 230026China Collaborative Innovation Center of Advanced Microstructures Nanjing 210093China State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of ChemistryJilin UniversityChangchun 130012China School of Chemistry and Materials Sciences CAS Key Laboratory of Materials for Energy Conversionand CAS Center for Excellence in NanoscienceUniversity of Science and Technology of ChinaHefei 230026China School Zhejiang Institute of Photonelectronics Jinhua 321004China

Charge density wave(CDW)is a phenomenon that occurs in materials,accompanied by changes in their intrinsic electronic properties.The study of CDW and its modulation in materials holds tremendous significance in materials research,as it provides a unique approach to controlling the electronic properties of materials.TiSe_(2) is a typical layered material with a CDW phase at low temperatures.Through V substitution for Ti in TiSe_(2),we tuned the carrier concentration in V_(x)Ti_(1-x)Se_(2) to study how its electronic structures evolve.Angle-resolved photoemission spectroscopy(ARPES)shows that the band-folding effect is sustained with the doping level up to 10%,indicating the persistence of the CDW phase,even though the band structure is strikingly different from that of the parent compound TiSe_(2).Though CDW can induce the band fold effect with a driving force from the perspective of electronic systems,our studies suggest that this behavior could be maintained by lattice distortion of the CDW phase,even if band structures deviate from the electron-driven CDW scenario.Our work provides a constraint for understanding the CDW mechanism in TiSe_(2),and highlights the role of lattice distortion in the band-folding effect.

关键词： charge density wave band structure lattice distortion

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Interfacial electronic interaction enabling exposed Pt(110)facets with high specific activity in hydrogen evolution reaction

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Nano Research 2023年第1期16卷 174-180页

作者： Sicong Qiao Qun He Quan Zhou Yuzhu Zhou Wenjie Xu hongwei shou Yuyang Cao Shuangming Chen Xiaojun Wu Li Song National Synchrotron Radiation Laboratory CAS Center for Excellence in NanoscienceUniversity of Science and Technology of ChinaHefei 230026China Hefei National Laboratory for Physical Science at the Microscale Collaborative Innovation of Center of Chemistry for Energy Materials(iChEM)School of Chemistry and Materials SciencesUniversity of Science and Technology of ChinaHefei 230026China

To achieve a complete industrial chain of hydrogen energy,the development of efficient electrocatalysts for hydrogen evolution reaction(HER)is of great concerns.Herein,a nickel nitride supported platinum(Pt)catalyst with highly exposed Pt(110)facets(Pt_((110))-Ni_(3)N)is obtained for catalyzing HER.Combined X-ray spectra and density functional theory studies demonstrate that the interfacial electronic interaction between Pt and Ni3N support can promote the hydrogen evolution on Pt(110)facets by weakening hydrogen adsorption.As a result,the Pt_((110))-Ni_(3)N catalyst delivers an obviously higher specific activity than commercial 20 wt.%Pt/C in acidic media.This work suggests that the suitable interface modulation may play a vital role in rationally designing advanced electrocatalysts.

关键词： Interfacial electronic interaction hydrogen evolution reaction X-ray spectroscopy Pt(110)facets density functional theory

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Support induced phase engineering toward superior electrocatalyst

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Nano Research 2022年第3期15卷 1831-1837页

作者： Beibei Sheng Dengfeng Cao hongwei shou Oyawale Adetunji Moses Wenjie Xu Yujian Xia Yuzhu Zhou Huijuan Wang Ping Wan Shuang Zhu Wangsheng Chu Xiaojun Wu Shuangming Chen Li Song National Synchrotron Radiation Laboratory CAS Center for Excellence in NanoscienceUniversity of Science and Technology of ChinaHefei 230026China Hefei National Laboratory for Physical Sciences at the Microscales Department of Materials Sciences and EngineeringUniversity of Science and Technology of ChinaHefei 230026China Experimental Center of Engineering and Material Science University of Science and Technology of ChinaHefei 230026China Materials Interfaces Center Shenzhen Institutes of Advanced TechnologyChinese Academy of SciencesShenzhen 440305China Institute of Energy Hefei Comprehensive Nation Science CenterHefei 230031China

The phase transformation of catalysts has been extensively observed in heterogeneous catalytic reactions that hinder the long cycling catalysis,and it remains a big challenge to precisely control the active phase during the complex conditions in electrochemical catalysis.Here,we theoretically predict that carbon-based support could achieve the phase engineering regulation of catalysts by suppressing specific phase transformation.Taken single-walled carbon nanotube(SWCNT)as typical support,combined with calculated E-pH(Pourbaix)diagram and advanced synchrotron-based characterizations technologies prove there are two different active phases source from cobalt selenide which demonstrate that the feasibility of using support effect regulating the potential advantageous catalysts.Moreover,it is worth noting that the phase engineering derived Co_(3)O_(4)-SWCNT exhibits a low overpotential of 201 mV for delivering the current density of 10 mA/cm^(2)in electrocatalytic oxygen evolution reaction(OER).Also,it reaches a record current density of 529 mA/cm^(2)at 1.63 V(vs.RHE)in the electrocatalytic urea oxidation reaction(UOR),overwhelming most previously reported catalysts.

关键词： phase engineering support synchrotron radiation characterization oxygen evolution reaction(OER) urea oxidation reaction(UOR)

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Probing self-optimization of carbon support in oxygen evolution reaction

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Nano Research 2021年第12期14卷 4534-4540页

作者： Wenjie Xu Dengfeng Cao Oyawale Adetunji Moses Beibei Sheng Chuanqiang Wu hongwei shou Xiaojun Wu Shuangming Chen Li Song National Synchrotron Radiation Laboratory CAS Center for Excellence in NanoscienceUniversity of Science and Technology of ChinaHefei230026China Materials Interfaces Center Shenzhen Institute of Advanced TechnologyChinese Academy of ScienceShenzhen440305China Institutes of Physical Science and Information Technology Anhui UniversityHefei230601China Department of Materials Sciences and Engineering School of Chemistry and Materials SciencesUniversity of Science and Technology of ChinaHefei230026China

Despite acknowledgment of structural reconstruction of materials following oxygen evolution reaction (OER) reaction, the role of support during the reconstruction process has been ignored. Given this, we directly in situ transform the residual iron present in raw single-walled carbon nanotubes (SWCNT) into Fe_(2)O_(3) and thus build Fe_(2)O_(3)-CNT as the model system. Intriguingly, an anomalous self-optimization occurred on SWCNT and the derived components show satisfactory electrochemical performance. Soft X-ray absorption spectroscopy (sXAS) analysis and theory calculation correspondingly indicate that self-optimization yields stronger interaction between SWCNT and Fe_(2)O_(3) nanoparticles, where the electrons migrate from Fe_(2)O_(3) to optimized SWCNT. Such polarization will generate a positive charge center and thus boost the OER activity. This finding directly observes the self-optimization of support effect, providing a new perspective for OER and related electrochemical reactions.

关键词： self-optimization of support single-walled carbon nanotube(SWCNT) oxygen evolution reaction(OER) Fe_(2)O_(3) soft X-ray absorption spectroscopy(sXAS)

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The significance of changes in platelet concentration during the early phase after severe burn injury in a Chinese mass casualty

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Burns & Trauma 2017年第4期5卷 249-253页

作者： Beiming shou Junqiang Li Chenqi Tang Qian Tan Dongfeng Zheng Binwei Sun Lanjun Nie hongwei Zhang Yanan Jiang Chunming Wang Yanwen Wu Department of Burns and Plastic Surgery The Drum Tower Clinical Medical College Nanjing Medical University Nanjing Jiangsu 210008 China Department of Burns and Plastic Surgery Hospital of Nanjing Fire Service Nanjing Jiangsu 210008 China Department of Burn Changhai Hospital The Second Military Medical University Shanghai 200433 China Department of Burns and Plastic Surgery The Drum Tower Clinical Medical College Nanjing Medical University Nanjing Jiangsu 210008 China Department of Burns and Plastic Surgery Affiliated Drum Tower Hospital Nanjing University Medical School Nanjing Jiangsu 210008 China Department of Burns and Plastic Surgery Affiliated Drum Tower Hospital Nanjing University Medical School Nanjing Jiangsu 210008 China Department of Burn and Plastic Surgery Affiliated Hospital Jiangsu University Zhenjiang Jiangsu 212001 China Department of Burn and Plastic Surgery The Second Affiliated Hospital of Nanjing Medical University Nanjing Jiangsu 21000 China Department of Burns and Plastic Surgery Hospital of Jiangsu province Nanjing Jiangsu 210000 China Department of Burns and Plastic Surgery Hospital of Nanjing Fire Service Nanjing Jiangsu 210008 China

Background:Changes in platelet concentration are common in severe burn patients. Platelets play a key role in the course of disease. This study aims to explore the significance of platelet concentration during the course of the disease in victims of a mass burn casualty. Methods:A total of 180 patients were involved in the'8.2'Kunshan explosion accident in China. The examined data included age, gender, total burn area (%TBSA), third-degree burn area (%TBSA), and platelet concentration within the first 5 days after the burn injury. The patients were divided into two groups according to four indicators (resuscitation, acute respiratory distress syndrome, acute kidney injury, septic shock). We collected several types of data for the patients and divided the patients into a complication group and non-complication group according to the diagnostic criteria. We analyzed the platelet concentration of the two groups using t tests to determine whether significant differences were present. P values <0.05 were considered statistically significant. Results: The group with successful resuscitation had higher platelet concentration than the failure group on day 3 and day 5. The patients who suffered from acute kidney injury (AKI) and septic shock had a lower platelet concentration than non-sufferers on day 3 and day 5. Conclusions: The platelet concentration of burn patients can dynamical y reflect the pathophysiological changes of the body. It can be used as an early objective indicator of prognosis in mass burn casualty cases.

关键词： Mass burn casualty Platelet concentration Sepsis MOF

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分散固相萃取-高效液相色谱法测定水产品中7种麻醉剂

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色谱 2022年第2期40卷 139-147页

作者：石芳寿旦金米聪王宏伟陈旭光朱岩浙江大学化学系浙江杭州310028 浙江省中医药研究院中药研究中心浙江杭州310007 宁波市疾病预防控制中心浙江宁波315010 浙江省立同德医院浙江杭州310012 浙江省冶金研究院有限公司浙江杭州310007 浙江省微量有毒化学物健康风险评估技术研究重点实验室浙江杭州310028

随着麻醉剂广泛用于渔业生产过程和水产品运输等领域,建立水产品中麻醉剂残留的检测方法具有重要意义。由于水产品基质复杂且麻醉剂残留水平低,因此需要合适的前处理方法以提高检测灵敏度。该研究基于分散固相萃取-高效液相色谱,建立了... 详细信息

随着麻醉剂广泛用于渔业生产过程和水产品运输等领域,建立水产品中麻醉剂残留的检测方法具有重要意义。由于水产品基质复杂且麻醉剂残留水平低,因此需要合适的前处理方法以提高检测灵敏度。该研究基于分散固相萃取-高效液相色谱,建立了一种同时检测水产品中普鲁卡因、丁氧卡因、三卡因、丁香酚、甲基丁香酚、异丁香酚、甲基异丁香酚7种麻醉剂的分析方法。前处理采用分散固相萃取;确定了1.0%甲酸乙腈为提取溶剂,20 mg苯乙烯-甲基丙烯酸缩水甘油酯聚合物微球(PS-GMA)、50 mg N-丙基乙二胺(PSA)和10 mg C18混合吸附剂为净化剂,二甲基亚砜(DMSO)辅助氮吹的前处理方法;优化了提取时间和DMSO用量等条件。7种麻醉剂采用Welch welchrom C18色谱柱(250 mm×4.6 mm,5μm)进行分离,以甲醇和0.05%甲酸-5 mmol/L乙酸铵水溶液为流动相进行梯度洗脱,检测波长为235、260和290 nm,以鱼肉和对虾两种基质匹配标准曲线进行定量分析。实验结果表明,在优化的实验条件下,7种目标麻醉剂在各自的浓度范围内具有良好的线性关系(相关系数R^(2)>0.999),检出限(LOD)为0.011~0.043 mg/kg。在鱼肉样品中,3个水平的平均加标回收率为79.7%~109%,相对标准偏差(RSD)低于7.2%;在对虾样品中,平均回收率为78.0%~99.9%,RSD低于8.3%。该方法具有快捷简便、操作简单、灵敏度高等优点,可应用于水产品中3种氨基苯甲酸酯类和4种丁香酚类麻醉剂的检测。

关键词：分散固相萃取高效液相色谱麻醉剂水产品

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新建铁路引入成都枢纽方案研究

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高速铁路技术 2024年第1期15卷 103-106页

作者：刘博诗祝志飞张红伟李伟丛靖中铁二院工程集团有限责任公司成都630031 国家铁路局安全技术中心北京100106

成都枢纽是我国铁路网的关键节点和骨干枢纽。为研究某铁路引入成都枢纽方案,综合考虑枢纽客货运布局及总图规划、城市发展规划、客流特点、新线引入对既有线干扰等因素,采用多因素分布研究的方法,对引入站选择及线路走向方案开展系统... 详细信息

成都枢纽是我国铁路网的关键节点和骨干枢纽。为研究某铁路引入成都枢纽方案,综合考虑枢纽客货运布局及总图规划、城市发展规划、客流特点、新线引入对既有线干扰等因素,采用多因素分布研究的方法,对引入站选择及线路走向方案开展系统研究。经综合比选,推荐采用可贯通东西向干线铁路、动车组径路灵活、线路引入对枢纽影响小、符合城市规划与发展要求的引入天府站方案;在引入天府站基础上,进一步研究线路走向方案,选取工程投资节省、兼顾工业园区运输需求、配套基地设置条件好的经寿安方案作为推荐方案。研究成果可为类似工程项目提供借鉴和参考。

关键词：成都铁路枢纽总图规划多因素分析引入方案线路走向

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基于约束插值算法的井资料外推(英文)

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Applied Geophysics 2008年第4期5卷 307-313页

作者：刘红伟刘洪秦月霜首皓中国科学院地质与地球物理研究所北京100029 中国地质大学(北京)地质过程与矿产资源国家重点实验室北京100083 中国石油大庆油田有限责任公司大庆163712 中国石油勘探开发研究院北京100083

本文在详细分析地震和测井方法属性差异的础上,系统讨论了声测井和地震资料的匹配问题,提出了一种基于瞬时相位地层追踪的井震匹配方法。通过同相轴拉平技术使地震资料和井旁道资料同相位对比,运用SVD方法求解方程得到插值系数,并利用... 详细信息

本文在详细分析地震和测井方法属性差异的础上,系统讨论了声测井和地震资料的匹配问题,提出了一种基于瞬时相位地层追踪的井震匹配方法。通过同相轴拉平技术使地震资料和井旁道资料同相位对比,运用SVD方法求解方程得到插值系数,并利用插值系数把测井资料外推,从而得到同相轴连续,分辨率高,同时在井孔与测井资料能够匹配的地震资料。本方法应用于大庆mao2井区数据,得到了很好的效果。

关键词：地震勘探方法物理学

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集装箱运输卡车DC型柴油机常见油路故障诊断及排除

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集装箱化 2001年第12期12卷 35-36,34页

作者：寿宏伟上海长荣集装箱货运有限公司上海200432

目前,集装箱的陆上运输,尤其是"门到门"方式的运输主要由大型半挂卡车担当的,而这些卡车的动力装置几乎全部是柴油发动机,如果大型半挂车动力装置在行车途中发生故障,不但会影响港口、航运公司的运输计划、客户的生产和贸易,而且会对港... 详细信息

目前,集装箱的陆上运输,尤其是"门到门"方式的运输主要由大型半挂卡车担当的,而这些卡车的动力装置几乎全部是柴油发动机,如果大型半挂车动力装置在行车途中发生故障,不但会影响港口、航运公司的运输计划、客户的生产和贸易,而且会对港区、市区或高速公路的道路交通造成很大的影响.

关键词：油管喷油嘴卡死管类喷油器排除方法泵油发动机油路故障压燃发动机柴油机箱运化运输集装箱运输卡车 DC

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复杂介质地震波场模拟的单程波方法

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石油物探 2009年第5期48卷 479-482页

作者：首皓孙鲁平刘红伟赵晓龙中国石油勘探开发研究院北京100083 中国科学院地质与地球物理研究所北京100029 中国石油天然气集团公司川庆钻探工程有限公司工程技术研究院陕西西安710018

单程波方法是常用的地震正演模拟方法之一。与双程波方法相比,单程波方法的计算量成倍减少,且能保持较高的精度。但由于单程波方法不能获得准确的入射角信息,因而多采用垂直入射的反射系数,使得模拟波场的振幅特征不是实际地层的真实反... 详细信息

单程波方法是常用的地震正演模拟方法之一。与双程波方法相比,单程波方法的计算量成倍减少,且能保持较高的精度。但由于单程波方法不能获得准确的入射角信息,因而多采用垂直入射的反射系数,使得模拟波场的振幅特征不是实际地层的真实反映。为此,提出了结合频率-波数域反射系数近似公式和相移加插值的改进单程波方法。分别采用双程波虚谱法、常规单程波方法和改进单程波方法,基于Marmousi模型进行了数值模拟,对比模拟结果发现,改进的单程波方法可以准确地模拟振幅随入射角的变化,且具备与双程波方法相同的精度。

关键词：地震波正演模拟波动方程单程波相移加插值反射系数随入射角变化

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