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Electronic structure regulation and built-in electric field synergistically strengthen photocatalytic nitrogen fixation performance on Ti-BiOBr/TiO_(2)heterostructure

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Rare Metals 2024年第3期43卷 1125-1138页

作者： Ru-Qi Li Yu-Jie bian chun-Ming Yang Li Guo Tao-Xia Ma Chuan-Tao Wang Feng Fu Dan-Jun Wang College of Chemistry and Chemical Engineering Yan’an UniversityYan’an Key Laboratory of Green Catalysis and Quality Improvement and Utilization of Low Rank CoalYan’an716000China

At present,industrial synthetic ammonia was still obtained through the Hubble-Bosch process,with large energy consumption.It is a research hotspot to realize green synthetic ammonia by using solar energy.The difficulty of photocatalytic ammonia synthesis was that the photo-excited electrons have not enough energy to active N≡N.In this study,Ti was doped into BiOBr by one-step hydrothermal method,which was oxidized into TiO_(2)when the doping amount reaches the maximum,in situ forming Ti_(0.31)B_(0.69)OB/TiO_(2)composites.Benefiting from the synergistic effect of Ti doping and S-scheme heterojunction,the synthetic ammonia efficiency of Ti_(0.31)B_(0.69)OB/TiO_(2)-11.96 reached 1.643 mmol·g_(cat)^(-1)at mild conditions and without hole scavenger for up to 7 h,the efficiency of synthetic ammonia is 115 times,10.5 times and 3.3 times of that of BiOBr,Ti_(0.31)B_(0.69)OB and TiO_(2),respectively.Specifically,DFT calculation confirms that Ti doping accurately refine the electronic structure of BiOBr,facilitate nitrogen adsorption activation and reduce hydrogenation reaction energy barrier,thus accelerating the reaction kinetics of photocatalytic nitrogen reduction(NRR),Meanwhile,constructing S-scheme heterojunction boosts the separation and transfer of photogenerated electron-hole pairs,improving the reduction ability of electrons in the conduction band of TiO_(2)and the oxidation ability of holes in the valence band of Ti_(0.31)B_(0.69)OB.

关键词： S-scheme heterostructure Electronic structure regulation Built-in electric field Synergistical stren4gthening Photocatalytic nitrogen fixation

Case report of neurofibromatosis type 1 combined with primary ciliary dyskinesia

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Frontiers of Medicine 2021年第6期15卷 933-937页

作者： chun bian Xinyue Zhao Yaping Liu Minjiang Chen Shuying Zheng Xinlun Tian Kai-Feng Xu Department of Internal Medicine State Key Laboratory of Complex Severe and Rare DiseasesPeking Union Medical College HospitalChinese Academy of Medical Sciences&Peking Union Medical CollegeBeijing100730China McKusick-Zhang Center for Genetic Medicine State Key Laboratory of Medical Molecular BiologyInstitute of Basic Medical SciencesChinese Academy of Medical Sciences&Peking Union Medical CollegeBeijing100730China Department of Pulmonary and Critical Care Medicine State Key Laboratory of Complex Severe and Rare DiseasesPeking Union Medical College HospitalChinese Academy of Medical Sciences&Peking Union Medical CollegeBeijing100730China Department of Electron Microscope Laboratory Peking University People’s HospitalBeijing100034China

Neurofibromatosis(NF)is a genetic disease in which the lungs are rarely involved.However,in NF cases with lung involvement,chest computed tomography may show bilateral basal reticulations,apical bullae,and cysts without bronchiectasis.Herein,we report a patient diagnosed with NF on the basis of the results of genetic testing who presented with early-onset wet cough and bronchiectasis.Considering the differential diagnosis of bronchiectasis combined with his early-onset wet cough,sinusitis,and sperm quality decline,we considered the possibility of primary ciliary dyskinesia(PCD).Further electron microscopy analysis of cilia and identification of homozygous mutations in the RSPH4A gene confirmed the diagnosis of PCD.Therefore,for patients with NF,when an image change exists in the lungs that does not correspond to NF,the possibility of other diagnoses,including PCD,must be considered.

关键词： primary ciliary dyskinesia neurofibromatosis bronchiectasis transmission electron microscopy genetic sequencing

四工作辊轧机轧制304不锈钢板件截面塑性变形分析

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塑性工程学报 2024年第3期31卷 127-133页

作者：杜春宽陈国美倪晓倪自丰卞达无锡商业职业技术学院智能装备与汽车工程学院江苏无锡214153 江苏省新能源汽车核心部件工程研究中心江苏无锡214153 无锡市新湖冷拔校直机厂江苏无锡214111 江南大学机械工程学院江苏无锡214122

针对四工作辊轧机轧制304不锈钢板件存在变形量大、尺寸不稳定的问题,利用Solidworks软件建立四工作辊轧制系统有限元模型,采用Deform软件对304不锈钢板件在不同轧辊直径、轧辊转速和轧辊压下量下进行轧制仿真,分析其对轧件截面高度和... 详细信息

针对四工作辊轧机轧制304不锈钢板件存在变形量大、尺寸不稳定的问题,利用Solidworks软件建立四工作辊轧制系统有限元模型,采用Deform软件对304不锈钢板件在不同轧辊直径、轧辊转速和轧辊压下量下进行轧制仿真,分析其对轧件截面高度和等效应力分布的影响,根据轧制仿真分析结果设计制造了四工作辊轧机,并对不同压下量下仿真和生产的轧件截面高度进行对比分析。结果表明,轧件截面塑性变形可分为相互作用Ⅰ区、过渡Ⅱ区和变形Ⅲ区,等效应力、等效应变和截面高度在Ⅰ区最大,在Ⅲ区最小且变化平稳,Ⅱ区值位于两者之间并呈U型分布。

关键词：四工作辊轧机冷轧塑性变形轧辊转速压下量

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基于双楔形扫描镜的甲烷气体光谱成像方法

物理学报 2024年第11期73卷 145-154页

作者：王夏春张志荣蔡永军孙鹏帅庞涛夏滑吴边郭强中国科学技术大学研究生院科学岛分院合肥230026 中国科学院合肥物质科学研究院安徽光学精密机械研究所光子器件与材料安徽省重点实验室合肥230031 中国科学院合肥物质科学研究院安徽光学精密机械研究所中国科学院环境光学与技术重点实验室合肥230031 国防科技大学先进激光技术安徽省实验室合肥230037 国家管网集团科学技术研究总院分公司廊坊065000

随着我国油气管道铺设数量的增加,对管道的维护工作也需予以更多的重视.目前,在油气输送站场内,主要采用人工巡检、对射式和云台式检测设备来检测天然气泄漏.但是这些方法存在响应度差、检测区域受限、泄漏点定位较慢等问题.为了满足对... 详细信息

随着我国油气管道铺设数量的增加,对管道的维护工作也需予以更多的重视.目前,在油气输送站场内,主要采用人工巡检、对射式和云台式检测设备来检测天然气泄漏.但是这些方法存在响应度差、检测区域受限、泄漏点定位较慢等问题.为了满足对油气管道泄漏实时监测和快速定位的需求,本文设计了一种快速、精确控制的双楔形扫描镜系统,结合可调谐半导体激光吸收光谱技术,使得气体测量由原来的点测量转换为面测量.通过反解迭代优化算法,控制楔形镜的转角获得高效均匀的光束扫描轨迹,并将激光束的偏转方向及检测位置与对应的甲烷浓度信息相融合,构建了包含有位置信息的甲烷浓度数据,实现甲烷气体的光谱成像.实验中为了定量验证测量准确度及空间分辨率,通过标准气袋模拟甲烷泄漏分布,结果表明系统的成像浓度检测限小于500 ppm·m(1 ppm=10^(–6)),位置分辨率小于6 cm.同时该方法可以依据油气站场的测量距离调节扫描步进节点,从而实现成像分辨率的可调节,该成像方法为精确定位甲烷气体泄漏提供了新的思路.

关键词：激光吸收光谱甲烷气体检测双楔形扫描镜气体成像

Biodegradable and flexible i-carrageenan based RRAM with ultralow power consumption

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Chinese Physics B 2024年第2期33卷 21-27页

作者：卞景垚陶冶王中强赵晓宁林亚徐海阳刘益春 Key Laboratory of UV-Emitting Materials and Technology of Ministry of Education Northeast Normal UniversityChangchun 130024China National Demonstration Center for Experimental Physics Education Northeast Normal UniversityChangchun 130024China

Transient memories,which can physically disappear without leaving traceable remains over a period of normal operation,are attracting increasing attention for potential applications in the fields of data security and green electronics.Resistive random access memory(RRAM)is a promising candidate for next-generation memory.In this context,biocompatible l-carrageenan(l-car),extracted from natural seaweed,is introduced for the fabrication of RRAM devices(Ag/l-car/Pt).Taking advantage of the complexation processes between the functional groups(C–O–C,C–O–H,et al.)and Ag metal ions,a lower migration barrier of Ag ions and a high-speed switching(22.2 ns for SET operation/26 ns for RESET operation)were achieved,resulting in an ultralow power consumption of 56 fJ.And the prepared Ag/l-car/Pt RRAM devices also revealed the capacities of multilevel storage and flexibility.In addition,thanks to the hydrophilic groups of l-car molecule,the RRAM devices can be rapidly dissolved in deionized(DI)water within 13 minutes,showing excellent transient characteristics.This work demonstrates that l-car based RRAM devices have great potential for applications in secure storage applications,flexible electronics and transient electronics.

关键词： RRAM transient electronics i-carrageenan ultralow power consumption

血管通路顽固性狭窄病变递进处置策略及临床分析

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中国血液净化 2024年第1期23卷 57-61页

作者：吴限叶红顾春峰卞雪芹雒湲南京医科大学第二附属医院肾脏病中心南京210003

目的对于动静脉内瘘顽固性狭窄病变,采取递进处置策略进行干预治疗,分析该方案治疗的预后,旨在探讨更为有效合理的动静脉内瘘维护手段。方法回顾性分析2020年6月—2021年6月在南京医科大学第二附属医院血液净化中心因高位自体动静脉内瘘... 详细信息

目的对于动静脉内瘘顽固性狭窄病变,采取递进处置策略进行干预治疗,分析该方案治疗的预后,旨在探讨更为有效合理的动静脉内瘘维护手段。方法回顾性分析2020年6月—2021年6月在南京医科大学第二附属医院血液净化中心因高位自体动静脉内瘘(autologous arteriovenous fistula,AVF)头静脉弓狭窄和人工血管动静脉内瘘(arteriovenous graft,AVG)静脉吻合口区域狭窄首次行超声引导经皮腔内血管成形术(percutaneous transluminal angioplasty,PTA)治疗,并采取递进处置策略维护的患者,随访24个月观察内瘘的通畅和再干预情况,另与南京医科大学第二附属医院血液净化中心同类病变单纯以高压球囊维护的随访数据比较得出结论。结果高位AVF头静脉弓狭窄采取递进处置策略维护的患者31例,单纯以高压球囊扩张规律维护的患者16例,随访24个月,两者在再干预次数(t=4.461,P<0.001)、再干预后平均通畅时间(t=3.550,P<0.001)及PTA辅助通畅率(χ^(2)=5.562,P=0.021)方面比较差异有统计学意义;AVG静脉吻合口区域狭窄采取递进处置策略维护的患者68例,单纯以高压球囊扩张规律维护的患者58例,随访24个月,两者在再干预次数(t=5.094,P<0.001)及再干预后平均通畅时间(t=3.251,P=0.002)方面比较差异有统计学意义。结论采取递进处置策略,循序渐进地使用各种介入治疗器械以及手术方案处置动静脉内瘘顽固性狭窄病变可以提高PTA的通畅性,减少干预频次,改善预后。

关键词：动静脉内瘘头静脉弓人工血管静脉吻合口扩张球囊导管覆膜支架

V-MoO_(x)对FeTiO_(x)/TiO_(2)催化剂上NH_(3)-SCR反应活性的影响

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化学研究与应用 2024年第4期36卷 868-875页

作者：刘淑珍边春艺于浩訾学红宋丽云北京工业大学材料科学与工程学院北京100124 北京工业大学环境科学与工程学院北京100124

氮氧化物(NO_(x))是当前重要的大气污染物之一,其主要治理技术有选择性催化还原(SCR)、吸附法等,其中前者应用最为广泛。随着中低温SCR脱硝技术在钢铁、水泥、垃圾焚烧等行业的应用,NO_(x)排放得到有效控制。催化剂是SCR技术的核心,以Fe... 详细信息

氮氧化物(NO_(x))是当前重要的大气污染物之一,其主要治理技术有选择性催化还原(SCR)、吸附法等,其中前者应用最为广泛。随着中低温SCR脱硝技术在钢铁、水泥、垃圾焚烧等行业的应用,NO_(x)排放得到有效控制。催化剂是SCR技术的核心,以FeTiO_(x)/TiO_(2)催化材料为主要研究对象,考察该催化剂及负载V_(2)O_(5)和MoO_(3)后的V-Mo/FeTiO_(x)/TiO_(2)催化剂的SCR性能,通过多项表征技术研究催化剂结构与性能的关系,为脱硝催化剂性能优化提供参考。结果表明:V-Mo/FeTiO_(x)/TiO_(2)催化剂因其较好的氧化还原性能、较多的弱酸性位点,在200-400℃范围内具有较高的催化活性;催化剂吸附NH_(3)前后的IR结果表明,负载钒钼后的催化剂L酸位点和B酸位点强度均高于负载前的催化剂,吸附NO_(2)前后的IR结果表明FeTiO_(x)/TiO_(2)催化剂表面的活性位点被大量硝酸盐物种覆盖。

关键词： NO_(x) SCR 催化活性酸性位点催化剂

Relationship between Localization of PBSU in Interlamellar/Interfibrillar Regimes and Double Peaks in DSC/SAXS in its Blend with PVDF

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Chinese Journal of Polymer Science 2022年第6期40卷 631-641页

作者： Jia-Yao Wang Yong-Jin Li Ji-chun You Feng-Gang bian Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China Shanghai Synchrotron Radiation Facility Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201204China College of Material Chemistry and Chemical EngineeringKey Laboratory of Organosilicon Chemistry and Material TechnologyMinistry of EducationHangzhou Normal UniversityHangzhou 311121China

In this work,phase segregation and localization of PBSU have been investigated with the combination of SAXS and DSC in its blend with PVDF.After stepwise crystallization of PVDF and PBSU,there are double melting peaks of PBSU in DSC and double scattering peaks in SAXS.It has been demonstrated that double peaks can be attributed to the localization of PBSU in interlamellar/interfibrillar region in pre-formed PVDF crystal framework.In the case of low content of PBSU in blend,PBSU is trapped into the interlamellar region of PVDF crystals,resulting in the alternating lamellae crystal of them and the first peak(with low-q)in SAXS.The enhanced confinement effect produces thinner PBSU lamellae,corresponding to the lower melting temperature in DSC.Upon increasing its content in blend,some PBSU segregates in interfibrillar regions in addition to the enrichment in interlamellar regions of PVDF crystal framework.The larger space and higher concentration of PBSU in interfibrillarregions contribute to periodic lamellae structure of PBSU with higher thickness,which is the reason for the second peak(with high-q)in SAXS and DSC.Our results not only clarify the relationship between localization of PBSU in interlamellar/interfibrillar regions and double peaks in DSC/SAXS,but also provide a novel strategy to detect the interlamellar and interfibrillar segregation of low-T_(m) component in miscible crystalline/crystalline blend.

关键词： Phase segregation Localization Double peaks DSC/SAXS

QCC活动管理对AMI患者行急诊PCI手术时间、心功能和预后的影响

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心血管康复医学杂志 2024年第3期33卷 280-284页

作者：王娜边春云张心可河北北方学院附属第一医院冠心病重症加强病房河北张家口075000

目的:探究品管圈(QCC)活动管理对行经皮冠状动脉介入治疗(PCI)手术的急性心肌梗死(AMI)患者手术时间、心功能及预后的影响。方法:选择2021年1月至6月我院急诊科收治并接受PCI手术的148例AMI患者。按照院内管理方式不同,患者被分为对照组... 详细信息

目的:探究品管圈(QCC)活动管理对行经皮冠状动脉介入治疗(PCI)手术的急性心肌梗死(AMI)患者手术时间、心功能及预后的影响。方法:选择2021年1月至6月我院急诊科收治并接受PCI手术的148例AMI患者。按照院内管理方式不同,患者被分为对照组(74例)和QCC组(74例)。比较两组急诊滞留时间及手术时间、术后7d及14d心功能指标、患者满意度及术后6个月不良心血管事件情况。结果:与对照组比较,QCC组心电监测时间[(11.35±2.13)min比(9.14±1.86)min]、病情评估时间[(14.78±2.51)min比(10.12±2.28)min]、用药准备时间[(29.69±5.03)min比(22.65±4.52)min]及手术时间[(83.47±10.76)min比(62.18±10.03)min]均显著降低,P均=0.001。与对照组比较,术后14d QCC组左室射血分数(LVEF)[(46.42±2.52)%比(58.54±1.82)%]显著升高,左室收缩末期容积指数(LVESVI)[(33.05±3.47)ml/m^(2)比(28.22±2.49)ml/m^(2)]和左室舒张末期容积指数(LVEDVI)[(69.08±4.53)ml/m^(2)比(56.85±2.48)ml/m^(2)]显著降低,P均<0.01。QCC组总满意度显著高于对照组(93.24%比62.16%),术后6个月不良心血管事件发生率显著低于对照组(12.16%比36.49%),P均=0.001。结论:品管圈活动管理模式介入可优化临床PCI手术流程,显著缩短急诊滞留时间、手术时间,改善心功能,降低术后心血管不良事件发生率,且满意度较高,值得临床推广应用。

关键词：心肌梗死血管成形术,气囊,冠状动脉护理