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Carbon Energy 2024年第5期6卷 127-136页

作者： Qing Qin Zijian Li Yingzheng Zhang Haeseong Jang Li Zhai Liqiang Hou xiaoqian wei Zhe Wang Min Gyu Kim Shangguo Liu Xien Liu College of Chemical Engineering Qingdao University of Science and TechnologyQingdaoChina Department of Chemistry City University of Hong KongHong Kong SARChina Department of Advanced Materials Engineering Chung-Ang UniversityAnseong-siGyeonggi-doRepublic of Korea Beamline Research Division Pohang Accelerator Laboratory(PAL)PohangRepublic of Korea

Electrocatalytic CO_(2)-to-formate conversion is considered an economically viable *** general,Zn-based nanomaterials are well-known to be highly efficient electrocatalysts for the conversion of CO_(2) to CO,but seldom do they exhibit excellent selectivity toward *** this article,we demonstrate that a heterointerface catalyst ZnO/ZnSnO3 with nanosheet morphology shows enhanced selectivity with a maximum Faradaic efficiency(FE)of 86%at−0.9 V versus reversible hydrogen electrode and larger current density for the conversion of CO_(2) to formate than pristine ZnO and *** particular,the FEs of the C1 products(CO+HCOO−)exceed 98%over the potential *** experimental measurements combined with theoretical calculations revealed that the ZnO in ZnO/ZnSnO3 heterojunction delivers the valence electron depletion and accordingly optimizes Zn d-band center,which results in moderate Zn-O hybridization of HCOO*and weakened Zn-C hybridization of competing COOH*,thus greatly boosting the HCOOH *** study highlights the importance of charge redistribution in catalysts on the selectivity of electrochemical CO_(2) reduction.

关键词： charge redistribution CO_(2)reduction reaction electrocatalyst heterointerfaces selectivity

Enhancing low-temperature NH_(3)-SCR performance of Fe-Mn/CeO_(2)catalyst by Al_(2)O_(3)modification

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Journal of Rare Earths 2022年第9期40卷 1454-1461,I0005页

作者： Lulu Li Jiawei Ji wei Tan Wang Song Xin Wang xiaoqian wei Kai Guo Wanyu Zhang Changjin Tang Lin Dong School of Environmental and Chemical Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China School of Chemistry and Chemical Engineering Nanjing UniversityNanjing 210093China Jiangsu Key Laboratory of Vehicle Emissions Control School of EnvironmentCenter of Modern AnalysisNanjing UniversityNanjing 210093China School of Environment Nanjing Normal UniversityNanjing 210093China

In the work,supported catalysts of FeO_(x) and MnO_(x) co-supported on aluminum-modified CeO_(2)was synthesized for low-temperature NH_(3)-selective catalytic reduction(NH_(3)-SCR)of ***,the SCR activity of the obtained catalyst is markedly influenced by the adding amount of Al and the appropriate Ce/Al molar ratio is 1/*** activity tests demonstrate that Fe-Mn/Ce1 Al2 catalyst shows over 90%NO conversion at 75-250℃and exhibits better SO_(2)resistance compared to Fe-Mn/CeO_(2).Fe-Mn/Ce1 Al2 shows the expected physicochemical characters of the ideal catalyst including the larger surface and increased active reaction active sites by controlling the amount of Al ***,the better catalytic activity is well correlated with the present advantaged surface adsorption oxygen species,Mn^(4+)species,Ce^(3+)species and the enhanced reducibility of Fe-Mn/Ce1 Al2,which is superior to the Fe-Mn/CeO_(2)*** importantly,we further demonstrate that the amount and strength of surface acid sites are improved by Al-doping and more active intermediates(monodentate nitrate)is generated during NH_(3)-SCR *** work provides certain insight into the rational creation of simple and practical denitration catalyst environmental purification.

关键词： Selectivity catalytic reduction NO removal Low-temperature activity Al doping Cerium dioxide Rare earths

Solid-phase impregnation promotes Ce doping in TiO_(2) for boosted denitration of CeO_(2)/TiO_(2) catalysts

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Chinese Chemical Letters 2022年第2期33卷 935-938页

作者： Wang Song Jiawei Ji Kai Guo Xin Wang xiaoqian wei Yandi Cai wei Tan Lulu Li Jingfang Sun Changjin Tang Lin Dong School of Chemistry and Chemical Engineering Nanjing UniversityNanjing 210093China Key Laboratory of Vehicles Emission Control of Jiangsu Province Center of Modern AnalysisNanjing UniversityNanjing 210093China School of Environment Nanjing Normal UniversityNanjing 210023China School of the Environment Nanjing UniversityNanjing 210093China School of Environmental and Chemical Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China

CeO_(2)/TiO_(2)(denoted as Ce Ti) catalysts obtained by solid-phase impregnation behaved better in lowtemperature selective catalytic reduction of NO_(x)with NH_(3)(NH_(3)-SCR) than that by conventional wet *** explore the main factors for activity distinction,the texture property,CeO_(2)dispersion and structure changes of TiO_(2)were comprehensively *** was found that surface changes of TiO_(2)had a significant impact on the improved *** results of inductively coupled plasma atomic emission spectrometer (ICP-AES),diffuse reflectance UV-vis spectroscopy (UV-vis-DRS) and Raman,it was inferred that Ce ions were partially incorporated into TiO_(2)lattice,accompanied with the formation of defects and vacancies during solid-phase ***,Ce Ti catalysts from solid-phase impregnation exhibited superiority in adsorption and activation of *** result from monitoring the preparation process indicated that the evolved NO played an important role in promoting Ce doping through depriving oxygen atoms on TiO_(2)*** interaction between Ce and Ti was *** catalyst performed better in NH_(3)-SCR,especially at low temperature,which testified the solid-phase impregnation could be an effective method to modulate interface structure for designing efficient catalyst.

关键词： CeO_(2)/TiO_(2) NH_(3)-SCR Solid-phase impregnation Interfacial interaction NO induced incorporation

DC Traction Power Supply System Based on Modular Multilevel Converter Suitable for Energy Feeding and De-icing

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CSEE Journal of Power and Energy Systems 2024年第2期10卷 649-659页

作者： Lingxi Hou Shuqing Zhang Yingdong wei xiaoqian Li Qirong Jiang Mingrui Li weirui Li Department of Electrical Engineering Tsinghua UniversityBeijing 100084China

A novel DC traction power supply system suitable for energy feeding and de-icing is proposed in this paper for an urban rail transit catenary on the basis of the full bridge submodule (FBSM) modular multilevel converter (MMC). The FBSM-MMC is a novel type of voltage source converter (VSC) and can directly control the output DC voltage and conduct bipolar currents, thus flexibly controlling the power flow of the urban rail transit catenary. The proposed topology can overcome the inherent disadvantages of the output voltage drop in the diode rectifier units, increase the power supply distance and reduce the number of traction substations. The flexible DC technology can coordinate multiple FBSM-MMCs in a wide area and jointly complete the bidirectional control of catenary power flow during the operation of the electric locomotive, so as to realize the local consumption and optimal utilization of the recovered braking energy of the train. In addition, the FBSM-MMCs can also adjust the output current when the locomotive is out of service to prevent the catenary from icing in winter. The working modes of the proposed topology are illustrated in detail and the control strategy is specially designed for normal locomotive operations and catenary de-icing. Simulation cases conducted by PSCAD/EMTDC validate the proposed topology and its control strategy.

关键词： DC traction power supply system de-icing for catenary energy feeding modular multilevel converter based on full-bridge submodules(FBSM-MMC) urban rail transit

盐酸氟西汀胶囊和草酸艾司西酞普兰片治疗首发抑郁症的临床效果研究

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中国现代医生 2024年第21期62卷 108-110,121页

作者：马增明陈进东夏玉平魏晓倩朱传安黄志源厦门市仙岳医院厦门医学院附属仙岳医院福建省精神医学中心福建省精神疾病临床医学研究中心住院部福建厦门361012 厦门市仙岳医院厦门医学院附属仙岳医院福建省精神医学中心福建省精神疾病临床医学研究中心院办公室福建厦门361012

目的探讨盐酸氟西汀胶囊和草酸艾司西酞普兰片治疗首发抑郁症的临床疗效。方法选取2023年2月至11月在厦门市仙岳医院中西医结合14病区住院的80例首发抑郁症患者,根据随机数字表法将患者分为盐酸氟西汀胶囊组(n=40)和草酸艾司西酞普兰片... 详细信息

目的探讨盐酸氟西汀胶囊和草酸艾司西酞普兰片治疗首发抑郁症的临床疗效。方法选取2023年2月至11月在厦门市仙岳医院中西医结合14病区住院的80例首发抑郁症患者,根据随机数字表法将患者分为盐酸氟西汀胶囊组(n=40)和草酸艾司西酞普兰片组(n=40);治疗前与治疗4周后对患者进行汉密顿抑郁量表(Hamilton depression scale,HAMD)评估,分析药物的临床治疗效果。结果药物治疗4周后,两组患者的HAMD评分均较本组治疗前显著降低(P0.05)。两组患者的总有效率比较,差异无统计学意义(P>0.05)。结论草酸艾司西酞普兰片与盐酸氟西汀胶囊治疗首发抑郁症患者均有效,两组患者的总有效率相近。

关键词：首发抑郁症草酸艾司西酞普兰片盐酸氟西汀胶囊临床疗效

Let-7i-5p maintains the stemness via R-spondin2/Wnt pathway in hepatocellular carcinoma

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Genes & Diseases 2024年第4期11卷 20-23页

作者： Qinghua wei Xueshan Dai Jiahui wei Wenwei Sun xiaoqian Yang Yuxin Zhang Xin Guo Yi Chen College of Pharmaceutical Sciences&Chinese Medicine Southwest UniversityChongqing 400716China Center for Basic Medical Research TEDA International Cardiovascular HospitalChinese Academy of Medical Sciences&Peking Union Medical CollegeTianjin 300457China Chongqing Key Laboratory of New Drug Screening from Traditional Chinese Medicine Chongqing 400716China pharmacology of Chinese Materia Medica-the Key Discipline Constructed by the State Administration of Traditional Chinese Medicine Chongqing 400716China Division of Cell Developmental and Integrative BiologySchool of MedicineSouth China University of TechnologyGuangzhouGuangdong 510006China National Demonstration Center for Experimental Pharmacy Education(Southwest University) Chongqing 400716China Engineering Research Center of Coptis Development and Utilization(Ministry of Education) College of Pharmaceutical Sciences and Chinese MedicineSouthwest UniversityChongqing 400716China

Cancer stem cells(CSCs)are related to tumorigenesis,recurrence,metastasis,and drug resistance in hepatocellular carcinoma(HCC).1 Let-7i is a noncoding small RNA,belonging to the famous miRNA let-7 ***,let-7i has been ... 详细信息

关键词： hepatocellular Cancer metastasis

Single-atom nanozymes with axial ligand-induced self-adaptive conformation in alkaline medium boost chemiluminescence

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Science China Chemistry 2023年第3期66卷 904-912页

作者： Zhen Luo Liliang Tian Hengjia Wang Zhichao Wu Xin Luo Xiaosi Wang Lei Jiao xiaoqian wei Ying Qin Lirong Zheng Liuyong Hu Wenling Gu Le Shi Chengzhou Zhu Key Laboratory of Pesticides and Chemical Biology of Ministry of Education International Joint Research Center for Intelligent Biosensing Technology and HealthCollege of ChemistryCentral China Normal UniversityWuhan 430079China State Key Laboratory of Electrical Insulation and Power Equipment Centre of Nanomaterials for Renewable EnergySchool of Electrical EngineeringXi’an Jiaotong UniversityXi’an 710049China Beijing Synchrotron Radiation Facility Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China Hubei Key Laboratory of Plasma Chemistry and Advanced Materials Hubei Engineering Technology Research Center of Optoelectronic and New Energy MaterialsWuhan Institute of TechnologyWuhan 430205China Fujian Shuikou Power Generation Group Corp. Fuzhou 350000China

Mimicking the structure of natural enzymes for designing advanced alternatives provides great opportunities to address the bottleneck of enzyme-involved chemiluminescence(CL). Herein, according to theoretical calculations, we found that an endogenous axial ligand of M-N-C single-atom nanozymes(SAzymes), originating from OH-spontaneously bonding to the metal center in an alkaline medium, can self-adaptively change its strength to facilitate intermediate steps. Furthermore, the lowest energy barrier of the rate-determining step and the strongest affinity and fastest electron transfer with luminol anion endow CoN-C with the highest peroxidase-like activity. Guided by the theoretical calculations, a series of M-N-C SAzymes(M=Fe, Co,Ni) were synthesized to boost CL, where Co-N-C SAzymes with superior catalytic activity and high selective generation of O_(2)·- were validated. As a proof-of-concept, Co-N-C SAzymes were employed for sensitive detection of acetylcholinesterase and organophosphorus pesticide.

关键词： single-atom nanozymes chemiluminescence hydrogen peroxide activation biosensing

A Novel Location Management Scheme based on DNS in Proxy Mobile IPv6

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China Communications 2010年第3期7卷 43-52页

作者： Qiu Feng Li xiaoqian Su wei Zhang Hongke National Engineering Laboratory for Next Generation Internet Interconnection Devices Beijing Jiaotong University Beijing 100044 P R. China

Proxy Mobile IPv6 (PMIPv6) is designed to provide a network-based localized mobility management protocol, but it does not handle the global mobility of hosts. In this paper, we propose a location management scheme based on Domain Name System (DNS) for PMIPv6 which can support global mobility by using DNS as a location manager. In addition, to support large numbers of mobile terminals and enhance network scalability a paging extension scheme is introduced to PMIPv6. To evaluate the proposed location management scheme, we establish an analytical model, formulate the location update cost and the paging cost, and analyze the influence of the different factors on the total signaling cost. The performance results show that our proposed scheme outperforms the basic PMIPv6 under various parameters in terms of reducing the signaling overhead and the proposed scheme reduces signaling overhead compared to the basic PMIPv6.

关键词：通信系统域名系统 PMIPv6 通信网络

Single-Cell Mapping of Brain Myeloid Cell Subsets Reveals Key Transcriptomic Changes Favoring Neuroplasticity after Ischemic Stroke

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Neuroscience Bulletin 2024年第1期40卷 65-78页

作者： Fangxi Liu Xi Cheng Chuansheng Zhao xiaoqian Zhang Chang Liu Shanshan Zhong Zhouyang Liu Xinyu Lin wei Qiu Xiuchun Zhang Department of Neurology.The First Affiliated Hospital of China Medical University Shenyang 110001China Department of Neurology The Third Affiliated Hospital of Sun Yat-sen UniversityGuangzhou 510630China Stroke Center The First Affiliated Hospital of China Medical UniversityShenyang 110001China

Interactions between brain-resident and periph-eral infiltrated immune cells are thought to contribute to neuroplasticity after cerebral ***,con-ventional bulk sequencing makes it challenging to depict this complex immune *** single-cell RNA sequencing,we mapped compositional and transcriptional features of peri-infarct immune *** were the predominant cell type in the peri-infarct region,displaying a more diverse activation pattern than the typical pro-and anti-inflammatory state,with axon tract-associated micro-glia(ATMs)being associated with neuronal *** inference suggested that infiltrated monocyte-derived macrophages(MDMs)exhibited a gradual fate trajectory transition to activated ***-cellular crosstalk between MDMs and microglia orchestrated anti-inflammatory and repair-promoting microglia phenotypes and promoted post-stroke neurogenesis,with SOX2 and related Akt/CREB signaling as the underlying *** description of the brain's immune landscape and its relationship with neurogenesis provides new insight into promoting neural repair by regulating neuroinflammatory responses.

关键词： Ischemic stroke Monocyte-derived macrophage Microglia Neurogenesis Single-cell sequencing

Secondary-Atom-Doping Enables Robust Fe-N-C Single-Atom Catalysts with Enhanced Oxygen Reduction Reaction

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Nano-Micro Letters 2020年第11期12卷 281-291页

作者： Xin Luo xiaoqian wei Hengjia Wang Wenling Gu Takuma Kaneko Yusuke Yoshida Xiao Zhao Chengzhou Zhu Key Laboratory of Pesticide and Chemical Biology of Ministry of Education International Joint Research Center for Intelligent Biosensing Technology and HealthCollege of ChemistryCentral China Normal UniversityWuhan 430079People’s Republic of China Innovation Research Center for Fuel Cells The University of Electro-CommunicationsChofugaokaChofuTokyo 182‑8585Japan

Single-atom catalysts(SACs) with nitrogen-coordinated nonprecious metal sites have exhibited inimitable advantages in ***,a large room for improving their activity and durability ***,we construct atomically dispersed Fe sites in N-doped carbon supports by secondary-atom-doped *** the secondary doping,the density and coordination environment of active sites can be efficiently tuned,enabling the simultaneous improvement in the number and reactivity of the active ***,structure optimizations in terms of the enlarged surface area and improved hydrophilicity can be achieved *** to the beneficial microstructure and abundant highly active FeN_5 moieties resulting from the secondary doping,the resultant catalyst exhibits an admirable half-wave potential of 0.81 V versus 0.83 V for Pt/C and much better stability than Pt/C in acidic *** work would offer a general strategy for the design and preparation of highly active SACs for electrochemical energy devices.

关键词： Single-atom catalysts Fe-N-C catalysts Doping Porous nanostructures Oxygen reduction reaction