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Muon Spin Relaxation Study of Frustrated Tm_(3)Sb_(3)Mg_(2)O_(14)with Kagomé Lattice

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Chinese Physics Letters 2022年第10期39卷 45-49页

作者： Yanxing yang Kaiwen Chen zhaofeng Ding Adrian D.Hillier Lei Shu State Key Laboratory of Surface Physics Department of PhysicsFudan UniversityShanghai 200438China ISIS Facility STFC Rutherford Appleton LaboratoryChiltonDidcotOxfordshireOX110QXUnited Kingdom Collaborative Innovation Center of Advanced Microstructures Nanjing 210093China Shanghai Research Center for Quantum Sciences Shanghai 201315China

The structure and magnetic properties of rare-earth ions Tm^(3+)Kagomé lattice Tm_(3)Sb_(3)Mg_(2)O_(14)are studied by x-ray diffraction,magnetic susceptibility and muon spin relaxation(𝜇SR)*** existence of a small amount of Tm/Mg site-mixing disorder is *** magnetic susceptibility measurement shows that Tm^(3+)magnetic moments are antiferromagnetically correlated with a negative Curie-Weiss temperature of−26.3 *** long-range magnetic order nor spin-glass transition is observed by DC and AC magnetic susceptibility,and confirmed by μSR experiment down to 0.1 ***,the emergence of short-range magnetic order is indicated by the zero-field μSR experiments,and the absence of spin dynamics at low temperatures is evidenced by the longitudinal-field μSR *** with the results of Tm_(3)Sb_(3)Zn_(2)O_(14),another Tm-based Kagomé lattice with much more site-mixing disorder,the gapless spin liquid like behaviors in Tm_(3)Sb_(3)Zn_(2)O_(14)can be induced by disorder *** with perfect geometrical frustration are in urgent demand to establish whether QSL exists in this kind of materials with rare-earth Kagomé lattice.

关键词： technique effect susceptibility

Effect of oxygen terminated surface of boron-doped diamond thin-film electrode on seawater salinity sensing

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Journal of Materials Science & Technology 2021年第27期86卷 1-10页

作者： Dan Shi Lusheng Liu zhaofeng Zhai Bin Chen Zhigang Lu Chuyan Zhang Ziyao Yuan Meiqi Zhou Bing yang Nan Huang Xin jiang Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang110016China Institute of Materials Engineering University of SiegenPaul-Bonatz-Str.9-11Siegen57076Germany

Tremendous demands for highly sensitive and stable seawater salinometers have motivated intensive research on advanced electrode ***-doped diamond(BDD)is attractive in terms of its high mechanical stability and chemical inertness,but is usually hindered by its low double-layer capacitance(C_(dl))for seawater salinity ***,inspired by the principle of oxygen-terminated BDD electrode endowing higher C_(dl)than hydrogen-terminated surface,we introduce the oxygen terminated surface by oxygen plasma or reactive ion etch(RIE),and the fabricated oxygen terminated BDD electrodes demonstrate high sensitivity and long-term stability in seawater salinity detection comparing with the hydrogen terminated BDD ***,the as-fabricated O-BDD-RIE electrodes not only show remarkable enhanced response even better than the commercial platinum black electrodes but also display long-time stability which is weekly verified by continuous monitor for 90 *** outstanding performance of the oxygen terminated BDD electrodes can be ascribed to the enhancement of C-O surface functional group on C_(dl).In addition,a comprehensive analysis of effective electroactive surface area(EASA)and C_(dl)proves that the surface oxygen is the major factor for the improved C_(dl).In summary,the excellent oxygen terminated BDD electrodes promise potential application in seawater salinity detection.

关键词： Boron-doped diamond Capacitance Oxygen plasma Reactive ion etch Seawater salinity

鼻内窥镜下翻转鼻中隔粘骨膜瓣鼻中隔穿孔修复术

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中国中西医结合耳鼻咽喉科杂志 2002年第4期10卷 166-167页

作者：谢朝峰王学林杨燕珍余怀生邱素辉广东省汕头市第二人民医院耳鼻咽喉科 515011

目的探讨修补鼻中隔穿孔的新术式。方法鼻内窥镜下剥离鼻中隔穿孔后方之粘骨膜瓣,通过穿孔向对侧翻转,缝合固定于对侧穿孔前缘之创面,然后作鼻腔填塞。结果15例鼻中隔穿孔用本术式修补成功。分别随访0.5～1年,均无复发。结论本术式... 详细信息

目的探讨修补鼻中隔穿孔的新术式。方法鼻内窥镜下剥离鼻中隔穿孔后方之粘骨膜瓣,通过穿孔向对侧翻转,缝合固定于对侧穿孔前缘之创面,然后作鼻腔填塞。结果15例鼻中隔穿孔用本术式修补成功。分别随访0.5～1年,均无复发。结论本术式视野清晰,操作简便,成功率高。

关键词：鼻内窥间鼻中隔粘骨膜瓣鼻中隔穿孔修复术

Passivated ZnSe nanocrystals prepared by hydrothermal methods and their optical properties

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Nano-Micro Letters 2010年第3期2卷 190-196页

作者： Lingling Peng Yuhua Wang Qizheng Dong zhaofeng Wang Department of Materials Science School of Physical Science and TechnologyLanzhou University

Homogeneous Zn Se nanocrystals were prepared via surfactant-assisted hydrothermal *** agent CTAB was used to control the particle morphology and the growth *** structure,morphology and optical properties of Zn Se nanocrystals have been investigated by XRD,TEM and luminescence *** results indicated that the size of Zn Se nanocrystals ranged from 3.0 nm to 5.0 nm with cubic zinc blende *** Se nanocrystals coated by CTAB were revealed high dispersibility and distribution under *** to the bulk Zn Se,the absorption edges and photoluminescence peaks of Zn Se nanocrystals were blue shifted to higher energies due to the quantum confinement *** emission intensity was strengthened after coated CTAB compared to bare *** was mainly due to the surface ***,we simply explored the formation mechanism of Zn Se nanocrystal in hydrothermal system.

关键词： Zinc selenide Nanocrystals Surface passivatiom Photoluminescence

Role of local coordination in bimetallic sites for oxygen reduction: A theoretical analysis

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Journal of Energy Chemistry 2020年第5期29卷 131-137页

作者： Yuqi yang Hao Zhang zhaofeng Liang Yaru Yin Bingbao Mei Fei Song Fanfei Sun Songqi Gu Zheng Jiang Yuen Wu Zhiyuan Zhu Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201204China Shanghai Synchrotron Radiation Facility Zhangjiang LaboratoryShanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201210China University of Chinese Academy of Sciences Beijing 100049China Department of Chemistry Hefei National Laboratory for Physical Sciences at the MicroscaleiChEM(Collaborative Innovation Center of Chemistry for Energy Materials)University of Science and Technology of ChinaHefei 230026AnhuiChina ShanghaiTech University Shanghai 201210China

Understanding of the oxygen reduction reaction(ORR)mechanism for single atom catalysts is pivotal for the rational design of non-precious metal cathode materials and the commercialization of fuel ***,a series of non-precious metal electrocatalysts based on nitrogen-doped bimetallic(Fe and Co)carbide were modeled by density functional theory calculations to predict the corresponding reaction *** study elucidated prior oxygen adsorption on the Fe atom in the dual site and the modifier role of Co atoms to tune the electronic structures of *** reaction activity was highly correlated with the bimetallic center and the coordination environment of the adjacent ***,the preadsorption of*OH resulted in the apparent change of metal atoms'electronic states with the d-band center shifting toward the Fermi level,thereby boosting reaction *** result should help promote the fundamental understanding of active sites in ORR catalysts and provide an effective approach to the design of highly efficient ORR catalysts on an atomic scale.

关键词： Non-precious metal catalysts Bimetallic-sites Oxygen reduction reaction Density functional theory

Local and regional contributions to PM_(2.5) in the Beijing 2022 Winter Olympics infrastructure areas during haze episodes

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Frontiers of Environmental Science & Engineering 2021年第6期15卷 499-509页

作者： Yue Wang Mengshuang Shi zhaofeng Lv Huan Liu Kebin He State Key Joint Laboratory of ESPC State Environmental Protection Key Laboratory of Sources and Control of Air Pollution ComplexInternational Joint Laboratory on Low Carbon Clean Energy InnovationSchool of the EnvironmentTsinghua UniversityBeijing 100084China

The 2022 Winter Olympics is scheduled to take place in Beijing and Zhangjiakou,which were defined as OIAs(Olympic infirastructure areas)in this *** study presents the characteristics and source apportionment of PM_(2.5) in the OIAs,*** entire region of China's Mainland,except for the OIAs,was divided into 9 source regions,including four regions in the BTH(Beijing-Tianjin-Hebei)region,the four provinces surrounding the BTH and the remaining *** CAMx/PSAT,the contributions of the nine regions to the PM_(2.5) concentration in the OIAs were simulated spatially and *** simulated source apportionment results showed that the contribution of regional transportation was 48.78%,and when PM_(2.5) concentration was larger than 75μg/m^(3) central Hebei was the largest contributor with a contribution of 19.18%,followed by Tianjin,northern Hebei,Shanxi,Inner Mongolia,Shandong,southern Hebei,Henan and ***,the contribution from neighboring regions of the OIAs was 47.12%,which was nearly twice that of long-range *** episodes were analyzed,and the results presented the importance of regional transportation during severe PM_(2.5) pollution *** was also found that they were associated with differences in pollution sources between Zhangjiakou and *** transportation was the main factor affecting PM_(2.5) pollution in Zhangjiakou due to its low local *** weather with a low planetary boundary layer height and a low wind velocity prevented the local emitted pollutants in Beijing from being transported outside,and as a result,local emissions constituted a larger contribution in Beijing.

关键词： 2022 Winter Olympics PM_(2.5) Source apportionment

RF energy harvesting system for wireless intraocular pressure monitoring

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High Technology Letters 2015年第2期21卷 212-218页

作者：刘德盟 Mei Niansong Zhang zhaofeng Micro-Nano Device Research Center Shanghai Advanced Research InstituteChinese Academy of Science University of Chinese Academy of Sciences

This paper presents an RF energy harvesting system for wireless intraocular pressure monitoring *** system consists of an implantable antenna and a rectifier.A new sizing strategy is adopted to optimize the conversion efficiency of the rectifier,and the design principle of an implantable antenna is introduced from material selection and structure *** from testing demonstrate that the antenna gain is about-20 dBi and the rectifier's maximum total conversion efficiency which contains match efficiency and rectifying efficiency is 47.18%under the implementation of0.18μm standard CMOS *** maximum power obtained from the proposed system is 8μW when the power density of electromagnetic wave is lower than the national standard 40μW/cm^2 at915 MHz,which is enough to power the intraocular pressure monitoring system.

关键词： RF energy harvesting system implantable medical system antenna rectifier intraocular pressure monitoring

Synthesis of covalent organic framework materials and their application in the field of sensing

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Nano Research 2024年第1期17卷 162-195页

作者： Weiyu Zhang Shiwei Liu Qihua Sun Ning Tian zhaofeng Wu Xinjiang Key Laboratory of Solid-State Physics and Devices Urumqi 830046China School of Physics Science and Technology Xinjiang UniversityUrumqi 830046China

Covalent organic frameworks(COFs)are an emerging type of porous crystalline polymers formed by combining strong covalent bonds with organic building *** to their large surface area,high intrinsic pore space,good crystallization properties,high stability,and designability of the resultant units,COFs are widely studied and used in the fields of gas adsorption,drug transport,energy storage,photoelectric catalysis,electrochemistry,and *** recent years,the rapid development of the Internet of Things and people’s yearning for a better life have put forward higher and more requirements for sensors,which are the core components of the Internet of ***,this paper reviews the recent progress of COFs in synthesis methods and sensing applications,especially in the last five *** paper first introduces structure,properties,and synthesis methods of COFs and discusses advantages and disadvantages of different synthesis ***,the research progress of COFs in different sensing fields,such as metal ion sensors,gas sensors,biomedical sensors,humidity sensors,and pH sensors,is introduced *** and prospects are also presented in order to provide a reference for researchers concerned with COFs and sensors.

关键词： covalent organic framework materials structural design and synthesis sensing application gas sensors

A novel memetic algorithm for distributed shape formation of swarm robots with both acceleration and velocity constraints

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Science China(Information Sciences) 2024年第12期67卷 157-175页

作者： Yun QU Bin XIN Qinqin WANG Ruocheng LI zhaofeng DU National Key Lab of Autonomous Intelligent Unmanned Systems Beijing Institute of Technology Science and Technology Innovation Center

This article investigates the problem of distributed shape formation(DSF) in swarm robot systems. DSF involves each robot autonomously selecting and moving toward a target point to achieve a desired shape. A comprehensive mathematical model for DSF of swarm robots is developed, capturing the relationships among states, behaviors, and kinematics constraints. A novel memetic algorithm(MA) is proposed to generate and evolve behavior strategies that enable real-time decision-making for each *** proposed MA includes specifically designed behaviors to address subproblems within DSF, such as target selection conflict, collision, and deadlock. These behaviors, along with propositions about the states of robots,are utilized to construct strategies by a tree-based encoding scheme. An evaluation mechanism based on multiagent simulation is devised to evaluate the performance of strategies. Additionally, a repair mechanism is introduced to eliminate redundant or unreachable subtrees in a strategy. To further improve the performance of generated strategies, tree-based local search operators are employed to exploit the neighborhood of the best strategy found yet during the iteration. Experimental results and the Wilcoxon rank-sum test show that the strategies generated by the proposed MA outperform state-of-the-art algorithms, significantly reducing the completion time of DSF.

关键词： distributed shape formation swarm memetic algorithm strategy decision-making