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Cobalt-nanoparticle catalysts derived from zeolitic imidazolate framework@MXene composites for efficient oxidative self-coupling of benzylamines

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Frontiers of Chemical Science and Engineering 2024年第1期18卷 95-106页

作者： Jie Chen mingyuan Jian Deqiong Xie Kecan Dou Deli Chen Weidong Zhu Fumin zhang Key Laboratory of the Ministry of Education for Advanced Catalysis Materials Institute of Physical ChemistryZhejiang Normal UniversityJinhua 321004China

In this study,we synthesize a catalyst comprising cobalt nanoparticles supported on MXene by pyrolyzing a composite in a N2 ***,the composite comprises a bimetallic Zn/Co zeolitic imidazole framework grown in situ on the outer surface of *** catalytic efficiency of the catalyst is tested for the self-coupling of 4-methoxybenzylamine to produce value-added imine,where atmospheric oxygen(1 atm)is used as the *** on the results,the catalyst displayed impressive catalytic activity,achieving 95.4%yield of the desired imine at 383 K for 8 ***,the catalyst showed recyclability and tolerance toward benzylamine substrates with various functional *** outstanding performance of the catalyst is primarily attributed to the synergetic catalytic effect between the cobalt nanoparticles and MXene support,while also benefiting from the three-dimensional porous ***,a preliminary investigation of potential reaction mechanisms is conducted.

关键词： MXene sacrificial template oxidative self-coupling Co nanoparticles imine

Construction of Cu-Ce interface for boosting toluene oxidation:Study of Cu-Ce interaction and intermediates identified by in situ DRIFTS

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Chinese Chemical Letters 2021年第11期32卷 3435-3439页

作者： Jiahui Lu Jinping Zhong Quanming Ren Jiaqi Li Linghe Song Shengpeng Mo mingyuan zhang Peirong Chen Mingli Fu Daiqi Ye School of Environment and Energy South China University of TechnologyGuangzhou 510006China

A facile hydrothermal method was applied to gain stably and highly efficient CuO-CeO_(2)(denoted as Cu1Ce2)catalyst for toluene *** changes of surface and inter properties on Cu1Ce2 were investigated comparing with pure CeO_(2)and pure *** formation of Cu-Ce interface promotes the electron transfer between Cu and Ce through Cu^(2+)+Ce^(3+)↔Cu^(+)+Ce^(4+)and leads to high redox properties and mobility of oxygen ***,the Cu1Ce2 catalyst makes up the shortcoming of CeO_(2)and CuO and achieved high catalytic performance with T_(50)=234°C and T_(99)=250°C(the temperature at which 50%and 90%C_(7)H_(8)conversion is obtained,respectively)for toluene *** reaction steps and intermediates for toluene oxidation over Cu1Ce2,CeO_(2)and CuO were detected by in situ DRIFTS,the fast benzyl species conversion and preferential transformation of benzoates into carbonates through C=C breaking over Cu1Ce2 should accelerate the reaction.

关键词： Cu-Ce interface Oxygen mobility Intermediates In situ DRIFTS Toluene oxidation

Export Credit Insurance Facilitates Cross-Border RMB Settlement

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China News Release 2023年第8期 17-19页

作者： Fang Lei zhang mingyuan 不详

As China’s Cross-Border RMB Settlement As the world’s second largest consumer market and the biggest trader of goods,China has expanded the cross-border RMB settlement in an orderly manner,and deepened the market-oriented reform of the RMB exchange rate,with the result that the curren cy exchange rate is generally maintained at a reasonable and balanced level.

关键词： Export RMB maintained

TC4钛合金表面激光熔覆Ti-Al涂层研究

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山东科学 2024年第3期37卷 55-65页

作者：孙永烁温道胜钱春光张铭浩吕庆华张明远王守仁汪鑫伟济南大学机械工程学院山东济南250014 哈尔滨工业大学空间环境与物质科学研究院黑龙江哈尔滨150001

钛合金具有密度低、比强度高和耐腐蚀性强等优异性能,因而被广泛应用于航空航天中,钛合金使用占比成为衡量航空航天设备是否先进的标准之一。由于该合金硬度低、耐磨性差,因此微动磨损成为钛合金零件失效的重要原因之一。为了提高钛合... 详细信息

钛合金具有密度低、比强度高和耐腐蚀性强等优异性能,因而被广泛应用于航空航天中,钛合金使用占比成为衡量航空航天设备是否先进的标准之一。由于该合金硬度低、耐磨性差,因此微动磨损成为钛合金零件失效的重要原因之一。为了提高钛合金的抗微动磨损性能,采用激光熔覆技术在TC4钛合金表面制备涂层。实验结果表明,激光熔覆Ti-Al粉末能改善TC4钛合金硬度和耐磨性能。

关键词： TC4钛合金激光熔覆抗氧化耐磨涂层

The role of snapin in regulation of brain homeostasis

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Neural Regeneration Research 2024年第8期19卷 1696-1701页

作者： Jiawen Li Xinqi Huang Yumei An Xueshi Chen Yiyang Chen mingyuan Xu Haiyan Shan Mingyang zhang Shanghai Key Lab of Forensic Medicine Key Lab of Forensic ScienceMinistry of JusticeChina(Academy of Forensic Science)ShanghaiChina Institute of Forensic Sciences Suzhou Medical CollegeSoochow UniversitySuzhouJiangsu ProvinceChina Department of Obstetrics and Gynecology The Affiliated Suzhou Hospital of Nanjing Medical UniversitySuzhouJiangsu ProvinceChina

Brain homeostasis refe rs to the normal working state of the brain in a certain period,which is impo rtant for overall health and normal life ***,there is a lack of effective treatment methods for the adverse consequences caused by brain homeostasis *** is a protein that assists in the formation of neuronal synapses and plays a crucial role in the normal growth and development of ***,many researchers have reported the association between snapin and neurologic and psychiatric disorders,demonstrating that snapin can improve brain *** manifestations of brain disease often involve imbalances in brain homeostasis and may lead to neurological and behavioral *** article aims to explo re the role of snapin in restoring brain homeostasis after injury or diseases,highlighting its significance in maintaining brain homeostasis and treating brain ***,it comprehensively discusses the implications of snapin in other extracerebral diseases such as diabetes and viral infections,with the objective of determining the clinical potential of snapin in maintaining brain homeostasis.

关键词： brain homeostasis diabetes neurological diseases snapin traumatic brain injury vesicle fusion

Characterizing Flight Delay Profiles with a Tensor Factorization Framework

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Engineering 2021年第4期7卷 465-472页

作者： mingyuan zhang Shenwen Chen Lijun Sun Wenbo Du Xianbin Cao School of Electronic and Information Engineering Beihang UniversityBeijing 100191China National Engineering Laboratory for Comprehensive Transportation Big Data Application Technology Beijing 100191China Department of Civil Engineering and Applied Mechanics McGill UniversityMontrealQC H3A 0C3Canada

In air traffic and airport management,experience gained from past operations is crucial in designing appropriate strategies when facing a new ***,this paper uses massive spatiotemporal flight data to identify similar traffic and delay patterns,which become critical for gaining a better understanding of the aviation system and relevant ***,as the datasets imply complex dependence and higher-order interactions between space and time,retrieving significant features and patterns can be very *** this paper,we propose a probabilistic framework for highdimensional historical flight *** apply a latent class model and demonstrate the effectiveness of this framework using air traffic data from 224 airports in China during 2014–*** find that profiles of each dimension can be clearly divided into various patterns representing different regular *** prove the effectiveness of these patterns,we then create an estimation model that provides preliminary judgment on the airport delay *** outcomes of this study can help airport operators and air traffic managers better understand air traffic and delay patterns according to the experience gained from historical scenarios.

关键词： Air traffic management Flight delay Latent class model Tensor decomposition

机理-数据融合驱动的互联变流系统故障诊断方法

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电气传动 2024年第4期54卷 11-20页

作者：石立国李延真李元付关雪琳徐志根张明远国网山东省电力公司青岛供电公司山东青岛266000 山东大学电气工程学院山东济南250001

三电平中点钳位型互联变流器,因其大容量、高电能质量等优势,已逐渐成为交直流混联配电网系统的主流能量变换装备。但其长期工作于大功率、时变负载、有限散热等恶劣工况,功率器件开路故障率高。同时,现有故障诊断方法多为单一机理或数... 详细信息

三电平中点钳位型互联变流器,因其大容量、高电能质量等优势,已逐渐成为交直流混联配电网系统的主流能量变换装备。但其长期工作于大功率、时变负载、有限散热等恶劣工况,功率器件开路故障率高。同时,现有故障诊断方法多为单一机理或数据依赖,无法克服系统模型结构复杂、运行工况多变的难题,诊断准确性与快速性较差。为此,提出了一种机理-数据融合驱动的互联变流系统故障诊断方法。首先,基于三电平变流系统的机理模型,结合神经网络观测器,构建机理-数据融合模型以提高故障诊断精度。随后,分析了电流残差量在不同器件开路故障后的变化轨迹,总结出电流残差故障特征表进行开路故障诊断。最后,实验与硬件在环测试结果验证了所提方法的有效性。

关键词：交直流混联配电网三电平互联变流器故障诊断机理-数据融合电流残差

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Unlocking single-atom catalysts via amorphous substrates

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Nano Research 2024年第5期17卷 3533-3546页

作者： Bohua Sun mingyuan Xu Xiaoxia Li Baohong zhang Rui Hao Xiaoyu Fan Binbin Jia Dingshun She School of Engineering and Technology China University of Geosciences(Beijing)Beijing 100083China Zhengzhou Institute China University of Geosciences(Beijing)Zhengzhou 451283China College of Materials and Chemical Engineering Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion MaterialsChina Three Gorges UniversityYichang 443002China School of Chemistry Beihang UniversityBeijing 100191China Chinese Academy of Sciences(CAS)Key Laboratory of Nanosystem and Hierarchy Fabrication CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing 100190China National Engineering Research Center of Nonferrous Metals Materials and Products for New EnergyChina GRINM Group Co.Ltd.Beijing 100088China

Single-atom catalysts(SACs)reveal great potential for application in catalysis due to their fully exposed active *** general,single atoms(SAs)and the coordination substrates need to have strong interactions or charge transfer to ensure the atomic dispersion,which requires the selection of a suitable substrate to stabilize the target *** studies have demonstrated that amorphous materials with abundant defects and coordinatively unsaturated sites can be used as substrates for more efficient capturing SAs,further enhancing the catalytic *** this review,we discuss recent research progress of SAs loaded on amorphous substrates for enhanced catalytic ***,we summarize the commonly used amorphous substrates for stabilizing ***,we present several advanced applications of amorphous SACs in the field of catalysis,including electrocatalysis and *** then,we also clarify the synergistic mechanism between SAs and amorphous substrate on catalytic ***,we summarize the challenges with our personal views and provide a critical outlook on how amorphous SACs continue to evolve.

关键词： single-atoms amorphous substrate synthetic strategy catalysis

A strategy for enhancing luminescence thermometry via Ta^(5+)-triggered K_(0.5)Na_(0.5)NbO_(3):Er^(3+)transparent ceramics

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Journal of Materiomics 2024年第5期10卷 984-994页

作者： Quan zhang Zetian Yang mingyuan Wang Yang Liu Shuangying Lei Laihui Luo Dirk Poelman Key Laboratory of MEMS of Ministry of Education School of Electrical Science and EngineeringSoutheast UniversityNanjing210096China LumiLab Department of Solid StateSciencesGhent UniversityKrijgslaan 281-S1GhentB-9000Belgium School of Materials Science and Engineering Nanjing University of Science and TechnologyNanjing210094China Department of Microelectronic Science and Engineering Ningbo UniversityNingbo315211China

Luminescence thermometry is a reliable approach for remote thermal sensing,and extensive studies have been devoted to designing a luminescence thermometer with heightened thermal ***,we report a promising luminescence thermometric material,Ta^(5+)-substituted K_(0.5)Na_(0.5)NbO_(3):0.003Er^(3+)transparent ferroelectric *** temperature sensing sensitivity is significantly improved by adjusting the concentration of Ta^(5+)in the ***,utilizing the fluorescence intensity ratio from the 2H_(11/2) and 4S_(3/2) thermally coupled states of Er^(3+)as a detecting signal within the temperature range of 273–543 K,an optimal maximum absolute sensitivity of 0.0058 K–1 and relative sensitivity of 0.0158 K–1 are achieved for K_(0.5)Na_(0.5)NbO_(3):0.65Ta^(5+)/0.003Er^(3+).Simultaneously,as the concentration of Ta5+increase,a unique evolution of structural phase transitions is observed from orthorhombic to tetragonal and then to *** is accompanied by an improvement in luminescence temperature sensing properties,and the best sensitivity is demonstrated in the cubic-phase ***,a huge change in infrared luminescence properties as a function of temperature is found around the structure transition temperature of the *** results indicate a promising potential for achieving highly sensitive thermometry or monitoring phase structure transitions through luminescence thermometry behavior in the K_(0.5)Na_(0.5)NbO_(3) host.

关键词： Transparent ceramics Temperature sensing Phase transition Upconversion emission