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Highly efficient room temperature phosphorescent liquid crystalline polymer optical waveguides for advanced optoelectronics

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Science China Chemistry 2024年第10期67卷 3450-3457页

作者： Jie Li Yan Guan Wei Xia Jin-Kang Chen Jiang Huang Yi Chen Qi Lin er-Qiang Chen He-Lou Xie Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education and Key Laboratory of Advanced Functional Polymer Materials of CollegesUniversities of Hunan Province and College of ChemistryXiangtan UniversityXiangtan 411105China School of Physics and Optoelectronics Xiangtan UniversityXiangtan 411105China Beijing National Laboratory for Molecular Sciences Key Laboratory of Polymer Chemistry and Physics of Ministry of EducationCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China

Active organic optical waveguide materials(OOWMs)incorporating room temperature phosphorescence(RTP)hold significant promise for diverse applications in photonic and optoelectronic *** this potential,realizing active RTP optical waveguides with large-sized ordered structures and minimal light loss remains a formidable *** address this issue,we present a groundbreaking thermoplastic active OOWM with low light loss,leveraging room temperature phosphorescent liquid crystalline polymer(LCP).This innovative material can be easily synthesized through the copolymerization of phosphorescent and liquid crystalline *** resulting RTP copolymer exhibits a nematic liquid crystal phase with a phosphorescence lifetime of approximately 0.15 ms and an afterglow duration of around 1 *** the excellent processability of LCP,we successfully produce meter-scale fibers via melt *** RTP LCP fibers,characterized by a high orientation of mesogens along the fiber axis,demonstrate superior light confinement and efficient light conduction compared to unoriented samples,resulting in a low optical loss coefficient of 0.13 dB/***,the thermal responsiveness of the RTP LCP optical waveguide enables its use as a photo *** pioneering work paves the way for the design of new OOWMs tailored for advanced photonics and optoelectronics devices.

关键词： room temperature phosphorescence liquid crystalline polymer active optical waveguide

A novel encoding mechanism for particle physics

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Nuclear Science and Techniques 2024年第8期35卷 153-166页

作者： Zhi‑Guang tan Sheng‑Jie Wang You‑Neng Guo Hua Zheng Aldo Bonasera School of Electronic Information and Electrical Engineering Changsha UniversityChangsha 410003China School of Physics and Information Technology Shaanxi Normal UniversityXi’an 710119China Key Laboratory of Quark and Lepton Physics(MOE) Central China Normal UniversityWuhan 430079China Cyclotron Institute Texas A&M UniversityCollege StationTX 77843USA Laboratori Nazionali del Sud INFN95123 CataniaItaly

This study proposes a novel particle encoding mechanism that seamlessly incorporates the quantum properties of particles,with a specific emphasis on constituent *** primary objective of this mechanism is to facilitate the digital registration and identification of a wide range of particle *** design ensures easy integration with different event generators and digital simulations commonly used in high-energy ***,this innovative framework can be easily expanded to encode complex multi-quark states comprising up to nine valence quarks and accommodating an angular momentum of up to 99/*** versatility and scalability make it a valuable tool.

关键词： Multi-quark state Encoding mechanism Constituent quark Particle physics

基于1H-NMR代谢组学技术的中药质量评价

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世界科学技术-中医药现代化 2013年第9期15卷 1862-1870页

作者：范刚罗尚华李艳谭尔张艺成都中医药大学民族医药学院成都611137

中药是现代药物的重要组成部分,应用现代分析技术鉴别中药材的真伪、评价质量的优劣,是中药现代化、国际化发展的重要内容。本文介绍了1H-NMR代谢组学技术的发展和特点,以及在中药品种鉴定、道地药材评价、炮制加工、适宜采收期等研究... 详细信息

中药是现代药物的重要组成部分,应用现代分析技术鉴别中药材的真伪、评价质量的优劣,是中药现代化、国际化发展的重要内容。本文介绍了1H-NMR代谢组学技术的发展和特点,以及在中药品种鉴定、道地药材评价、炮制加工、适宜采收期等研究中的应用。并在课题组前期研究基础上,对中药质量评价的1H-NMR代谢组学研究的技术方法、关键问题进行了详细的论述,为中药等天然药物的品种鉴定与质量评价提供了方法学参考。

关键词：中药 1H-NMR代谢组学品种鉴定质量评价

Teaching Design and Implementation of the Electrical and Electronic Technology Course Based on Teaching Ability Competition

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Journal of Electronic Research and Application 2024年第3期8卷 66-71页

作者： Xiayida Maxue’er Xinjiang Agricultural University Urumqi 830052China

The teaching ability competition is a vital method for stimulating teachers’enthusiasm and enhancing their teaching *** approach has gained increasing attention from colleges and universities in recent *** competition focuses on evaluating teachers’capabilities in designing and implementing lessons,encouraging the exchange of new educational ideas and high-quality teaching *** the teaching of Electrical and Electronic Technology courses based on insights from teaching competitions can significantly improve teaching *** paper explores the teaching design and implementation of the Electrical and Electronic Technology course,drawing on the principles of teaching ability ***,it analyzes the existing problems in teaching this ***,it highlights the significant benefits that teaching competitions bring to the *** on these insights,the paper proposes practical strategies aimed at enhancing students’interest and practical skills,thereby promoting innovative developments in teaching Electrical and Electronic Technology.

关键词： Teaching ability competition Electrical and Electronic Technology Course instructional design Colleges and universities

共享单车影响下接驳公交线路设计与车辆配置方法

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交通运输系统工程与信息 2023年第1期23卷 165-175页

作者：刘路美刘钲可马昌喜谭二龙马晓磊北京航空航天大学交通科学与工程学院北京100191 兰州交通大学交通运输学院兰州730070

针对轨道交通的“第一/最后一公里”问题,接驳公交和共享单车是通勤用户最常选择的两种公共交通方式。为理解共享单车对接驳公交出行需求和线路设计等规划运营方面的影响,提出供需交互状态下的接驳公交线路设计与车辆配置模型。需求端... 详细信息

针对轨道交通的“第一/最后一公里”问题,接驳公交和共享单车是通勤用户最常选择的两种公共交通方式。为理解共享单车对接驳公交出行需求和线路设计等规划运营方面的影响,提出供需交互状态下的接驳公交线路设计与车辆配置模型。需求端考虑出行时间和出行费用,基于用户在共享单车和接驳公交之间的模式选择行为,动态计算接驳公交实际出行需求;供应端考虑车辆容量、数量和流平衡约束,以最小化公交运营成本和用户出行成本之和为目标,建立混合整数非线性规划模型,优化接驳公交线路设计及车辆配置。模型采用拉格朗日松弛算法进行求解。该方法应用于北京市回龙观地铁站周边出行小区接驳公交线路设计,公交及单车出行需求采用真实的IC卡数据,以及摩拜单车骑行数据,站点间行驶时长采用高德驾车路径规划API(Application Programming Interface)数据。实验结果表明,车辆总数为10,线路数量为2时,考虑共享单车影响的接驳公交规划模型相较于只考虑单一模式可以有效避免规划需求误差。此时,各站点到地铁站的平均运行时间是15.58 min,乘客平均等待时间是3.35 min;在线路数量为4时,各站点到地铁站的平均运行时间为8.53 min,几乎减少了50%,乘客平均等待时间为3.44 min。然而,随着线路数量的增加,模型计算时间会呈指数级增长。因此,从模型计算时效性角度,线路数量设置为2或3时,均可满足0.5 h更新一次线路的应用需求。

关键词：交通工程线路设计车辆配置混合整数非线性规划接驳公交共享单车

Grain boundary-induced drastic sensing performance enhancement of Fe_(2)O_(3) gas sensors for acetone

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Rare Metals 2024年第9期43卷 4412-4424页

作者： Tian-Jun Hu Yi-Fan Li Yu-Zhu Tian Ying Wang Ya-Ru Chen Jun-Ming Zhang er-Gui Luo Jian-Feng Jia Key Laboratory of Magnetic Molecules&Magnetic Information Materials Ministry of Education School of Chemical and Material ScienceShanxi Normal UniversityTaiyuan 030032China

Exploring the structure-activity relationship between the performance of gas sensors and the structure of semiconductor metal oxide(SMO)nanomaterials is crucial for understanding and designing gas-sensing materials and overcoming the application limitations of SMO-based gas *** of a single SMO microstructure provides a promising solution to address this scientific problem due to its controllable *** this study,we control the grain boundary(GB)density of Fe_(2)O_(3)nanomaterials using a simple solvothermal *** have similar chemical compositions and crystal phases,providing an ideal platform for studying the influence of the GB density on the gas-sensing ***-sensing tests showed that the Fe_(2)O_(3)-1 sensor with medium GB density and the Fe_(2)O_(3)-2 sensor with high GB density had higher sensitivity and selectivity than the Fe_(2)O_(3)-0 sensors with low GB density before reaching the optimal operating ***,when the GB density increased,the response to acetone decreased slightly,whereas the optimal operating temperature *** work highlights the unique performance of the GB density in enhancing the gas sensitivity of a single SMO.

关键词： Semiconductor metal oxide(SMO) Grain boundary(GB)density Oxygen adsorption Charge transfer Gas sensors

A review of reservoir damage during hydraulic fracturing of deep and ultra-deep reservoirs

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Petroleum Science 2024年第1期21卷 384-409页

作者： Kun Zhang Xiong-Fei Liu Dao-Bing Wang Bo Zheng Tun-Hao Chen Qing Wang Hao Bai er-Dong Yao Fu-Jian Zhou National Key Laboratory of Petroleum Resources and Engineering China University of Petroleum-BeijingBeijing102249China School of Mechanical Engineering Beijing Institute of Petrochemical TechnologyBeijing102617China Tuha Downhole Operation Company CNPC Xibu Drilling Engineering Company LimitedShanshan838200XinjiangChina

Deep and ultra-deep reservoirs have gradually become the primary focus of hydrocarbon exploration as a result of a series of significant discoveries in deep hydrocarbon exploration *** reservoirs present unique challenges due to their deep burial depth(4500-8882 m),low matrix permeability,complex crustal stress conditions,high temperature and pressure(HTHP,150-200℃,105-155 MPa),coupled with high salinity of formation ***,the costs associated with their exploitation and development are exceptionally *** deep and ultra-deep reservoirs,hydraulic fracturing is commonly used to achieve high and stable *** hydraulic fracturing,a substantial volume of fluid is injected into the ***,statistical analysis reveals that the flowback rate is typically less than 30%,leaving the majority of the fluid trapped within the ***,hydraulic fracturing in deep reservoirs not only enhances the reservoir permeability by creating artificial fractures but also damages reservoirs due to the fracturing fluids *** challenging“three-high”environment of a deep reservoir,characterized by high temperature,high pressure,and high salinity,exacerbates conventional forms of damage,including water sensitivity,retention of fracturing fluids,rock creep,and proppant *** addition,specific damage mechanisms come into play,such as fracturing fluid decomposition at elevated temperatures and proppant diagenetic reactions at HTHP ***,the foremost concern in deep oil and gas development lies in effectively assessing the damage inflicted on these reservoirs by hydraulic fracturing,comprehending the underlying mechanisms,and selecting appropriate ***'s noteworthy that the majority of existing studies on reservoir damage primarily focus on conventional reservoirs,with limited attention given to deep reservoirs and a lack of systematic *** light of this,our approach entails initially summarizin

关键词： Artificial fracture Deep and ultra-deep reservoir Fracture conductivity Fracturing fluid Hydraulic fracturing Reservoir damage

The Return of Ten Thousand Birds

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China Book International 2024年第3期 91-93页

作者： Jin Duo'er Children's Literature Committee of the Jiangxi Provincial Writers Association

At dawn,when the sun beats its drum,Yingpanxu *** along With it,in addition to Yingpanxu's lush vegetation and curling cooking smoke,are the birds in the forest:egrets,cuckoos,turtledoves,willow warblers,shrikes,white pheasants,long-billed crows,pine *** spirits of the earth,fapping their wings,lightly tracing beautiful arcs through the forests and *** milk-like fog in the forest,and the towering mountains piercing into the clouds,become even more poetic and lively amidst the chorus of bird calls.

关键词： forest smoke mountains

基于DNA条形码和~1H-NMR代谢组学二维方法的多基原藏药沙棘鉴定

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中国中药杂志 2016年第4期41卷 578-585页

作者：刘悦刘川谭尔范刚向丽李晓东张艺成都中医药大学民族医药学院四川成都611137 中国中医科学院中药研究所北京100700 中国食品药品检定研究院北京100050

沙棘为典型多基原藏药,混用现象时有发生。该文旨在构建一种基于DNA条形码和~1H-NMR代谢组学的二维鉴定方法,为沙棘药材的准确鉴定与应用提供参考。应用ITS2和psb A-trn H序列以对中国沙棘、江孜沙棘和西藏沙棘进行DNA条形码鉴定,分析... 详细信息

沙棘为典型多基原藏药,混用现象时有发生。该文旨在构建一种基于DNA条形码和~1H-NMR代谢组学的二维鉴定方法,为沙棘药材的准确鉴定与应用提供参考。应用ITS2和psb A-trn H序列以对中国沙棘、江孜沙棘和西藏沙棘进行DNA条形码鉴定,分析其种内及种间变异、遗传距离等,构建系统发育邻接(NJ)树。同时采用基于~1H-NMR代谢组学方法获得3种沙棘药材的代谢物指纹谱图,对所得数据进行主成分分析(PCA)。结果表明,DNA条形码结合~1H-NMR代谢组学可以发掘3种沙棘种间的遗传和化学特征的差异性,并对3种沙棘进行准确鉴定。基于DNA条形码和~1H-NMR代谢组学建立的多基原藏药沙棘二维鉴定方法准确可靠,能为藏药鉴定和质量评价提供了一种新思路。

关键词：藏药沙棘 DNA条形码 1H-NMR代谢组学二维鉴定方法