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High speed laser cladding as a new approach to prepare ultra-high temperature ceramic coatings

Journal of Advanced Ceramics 2024年第2期13卷 143-154页

作者： Qiyao Deng Pengfei He Chuan Sun Yang Li Yue Xing yujie wang Jinglong Li Xiubing Liang Xin wang yujie Zhou Yujun Cai National-Local Joint Engineering Laboratory of Intelligent Manufacturing Oriented Automobile Die&Mould Tianjin University of Technology and EducationTianjin 300222China Defense Innovation Institute Academy of Military ScienceBeijing 100071China School of mechanical engineering Tianjin University of Technology and EducationTianjin 300222China Scientific and Technological Innovation Center Beijing 100012China

Ultra-high temperature ceramic(UHTC)coatings are used to protect the hot-end components of hypervelocity aerocrafts from thermal *** study provides a new approach to fabricate UHTC coatings with high speed laser cladding(HSLC)technology,and places more emphasis on investigating the formation mechanism,phase compositions,and mechanical properties of HSLC-UHTC *** show that a well-bonded interface between the coating and the tantalum alloy substrate can be *** coating is mainly composed of(Zr,Ta)C ceramic solid solution phase with a content of higher than 90% by volume and Ta(W)metal solid solution *** a relatively high powder feeding rate,the ZrC ceramic phase appears in the coating while a dense ZrC UHTC top layer with a thickness of up to~50μm is successfully *** for the mechanical properties of the HSLC coatings,the fracture toughness of the coating decreases with the increase of powder feeding *** increase of carbide solid solution phase can significantly improve the high temperature microhardness(552.7±1.8 HV0.5@1000℃).The innovative design of HSLC ZrC-based coatings on refractory alloys accomplishes continuous transitions on microstructure and properties from the substrate to the UHTC top layer,which is a very promising candidate scheme for thermal protection coating.

关键词： high speed laser cladding(HSLC) ultra-high temperature ceramic(UHTC) thermal protection coating microstructure mechanical properties

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Tailoring crystallization zinc hydroxide sulfates growth towards stable zinc deposition chemistry

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Nano Research 2024年第6期17卷 5243-5250页

作者： Kaixin Huang Xianguang Zeng Dan Zhang yujie wang Mu Lan Chengyan Wen Yi Guo College of Materials Science and Engineering Sichuan University of Science and EngineeringZigong 643000China Department of Chemistry College of Resource and EnvironmentBaoshan UniversityBaoshan 678000China College of Optoelectronic Engineering Chengdu University of Information TechnologyChengdu 610225China

The unstable zinc anode/electrolyte interface induced by corrosion,interfacial water splitting reaction,and dendrite growth seriously degrades the performances of metal Zn anode in aqueous ***,the nucleation and growth of zinc hydroxide sulfate(ZHS),an interfacial by-product,has been tailored by Tween 80 in the electrolyte,which thereby assists in in-situ forming a dense solid electrolyte interphase(SEI)with small-sized ZHS and evenly distributed Tween *** SEI has high corrosion resistance and uniform distribution of zinc ions,which not only contributes to blocking the interfacial side reactions but also induces stable and calm zinc plating/***,the modified electrolyte can confer the assembled Zn||Zn symmetric cell with a stable operation life over 1500 h at 1 mA·cm^(−2)and 1 mAh·cm^(−2)as well as the practical Zn||NH4V4O10 full battery with a high-rate capacity of 120 mAh·g^(−1)at the current density of 5 A·g^(−1).This work provides a way for regulating and reusing interfacial by-products,and a new sight on stabilization electrodes/electrolyte interfaces.

关键词： zinc hydroxide sulfides tailoring crystallization in-situ solid electrolyte interphase electrolyte engineering strategy aqueous zinc-ion battery

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A systematic review of system modeling and control strategy of proton exchange membrane fuel cell

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Energy Reviews 2024年第1期3卷 24-38页

作者： yujie wang Xingliang Yang Zhengdong Sun Zonghai Chen Department of Automation University of Science and Technology of ChinaHefeiAnhui230027PR China

The proton exchange membrane fuel cell,as a novel energy device,exhibits a wide array of potential *** paper offers a comprehensive review and discussion of modeling and control strategies for fuel cell *** commences with a concise introduction to the structure and principles of fuel ***,it outlines modeling approaches for various fuel cell subsystems,encompassing the fuel cell stack,air supply system,hydrogen supply system,thermal management system,and water management *** this,it conducts a comparative analysis and discussion of prevalent control strategies for the aforementioned ***,the paper outlines future research trends and directions in the modeling and control strategies of fuel *** aim of this paper is to provide ideas and inspirations for the design and management of membrane fuel cell systems from control aspects.

关键词： Proton exchange membrane fuel cell System modeling and Control,System modeling and control Water and thermal management

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Manganese-Catalyzed Regioselective Hydroboration of Quinolines via Metal-Ligand Cooperation

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CCS Chemistry 2024年第6期6卷 1535-1546页

作者： yujie wang Hengxu Li Haobo Yang Mingjie Fan Qiang Liu Center of Basic Molecular Science(CBMS) Department of ChemistryTsinghua UniversityBeijing 100084

Selective reduction of readily available N-heteroarenes is important in both organic synthesis and chemical ***,we describe ligand-controlled regiodivergent hydroboration of quinolines using well-defined amido-manganese catalysts,with an emphasis on the rarely reported 1,*** studies showed that 1,2-hydroboration of quinoline was kinetically favorable and reversible,whereas 1,4-hydroboration was under thermodynamic *** a 1-methyimidazolebased pincer amido-manganese complex as the catalyst,cooperative C-H…N andπ…πnoncovalent interactions between the 1-methyimidazole moiety and quinoline substrates enabled kinetic accessibility of 1,4-hydroboration,giving thermodynamically favored 1,4-hydroborated quinolines as the major *** this basis,Mn-catalyzed 1,4-hydroboration of a series of substituted quinolines proceeded smoothly in high yields.A high turnover number of 2500 was achieved in this reaction with satisfying *** transformation could be further applied to the C3-selective functionalization of quinolines,highlighting the synthetic utility of this *** contrast,using a pyridine-based pincer amido-manganese complex as the catalyst,which lacked the C-H…N interaction,the free-energy barrier for 1,4-hydroboration significantly increased through a N-B…N interaction between the“HMn-NB”species and quinoline,resulting in the kinetically favored 1,2-hydroboration product with excellent regioselectivity.

关键词： catalytic hydroboration N-heteroarenes regioselectivity manganese catalysis metal-ligand cooperation

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Supporting factors model for the sustainable step development of supply chain:An empirical study from China with grounded theory

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Frontiers of Engineering Management 2024年第2期11卷 311-325页

作者： Xiaohong CHEN Chunfang LU Weihua LIU Siyu wang Shangsong LONG Jingcheng QIU yujie wang Hunan University of Commerce Changsha 410205China Chinese Academy of Engineering Beijing 100088China College of Management and Economics Tianjin UniversityTianjin 300072China

The ongoing stability of supply chains faces significant challenges from trade protectionism,anti-globalization trends,and the COVID-19 *** remain resilient in this dynamic market environment,supply chains must evolve through iterative upgrades and transition to a higher level of sustainability,a process termed“step development.”The current literature,however,offers limited insights into achieving such step development in supply chain sustainability and its critical supporting *** study,grounded in theory,involved interviews with representatives from eight diverse Chinese *** introduce a model delineating supporting factors and a roadmap for Sustainable Step Development of Supply Chains(SSDSC).Our findings highlight three pivotal categories of support for SSDSC:institutional,technological,and social ***,we observed that external influences in these categories positively modulate their internal *** study identifies industrial technology,digital intelligence technology,corporate responsibility,and stakeholder needs as key elements in this *** conclude by offering theoretical and practical recommendations to foster SSDSC.

关键词： supply chain sustainable development supporting factors grounded theory

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Correlation of personality with individual reproductive success in shrub-nesting birds depends on their life history style

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Avian Research 2024年第1期15卷 42-49页

作者： Jianchuan Li Wen Zhang Ningning Sun yujie wang Lifang Gao Ran Feng Liqing Fan Bo Du Tibet Museum of Natural Science Lhasa850011China School of Life Sciences Lanzhou UniversityLanzhou730000China Institute of Plateau Ecology Tibet Agricultural and Animal Husbandry UniversityLinzhi860000China

Two questions in the research of animal personality—whether there is a correlation between a personality trait and individual reproductive success,and what is the genetic basis underlying a personality trait—remain *** addressed these two questions in three shrub-nesting birds,the Azure-winged Magpie(Cyanopica cyanus,AM),White-collared Blackbird(Turdus albocinctus,WB),and Brown-cheeked Laughingthrush(Trochalopteron henrici,BL).The personality type of an individual was first identified according to its response to a territorial ***,we compared the fleeing distance,breeding parameters,and differential expressed genes(DEGs) in the brain transcriptome between bold and shy *** the three species,bold breeders exhibited more aggressiveness towards an intruder of their territory than did shy *** reproductive success of bold breeders was significantly higher than that of shy breeders in AM but not in WB and *** three species shared one DEG,crabp1,which was up-regulated in bold relative to in shy *** regulating the expression of corticotropin-releasing hormone,higher crabp1 gene expression can decrease cellular response to retinoic ***,bold individuals are insensitive to external stresses and able to exhibit more aggressiveness to intruders than their shier *** is beneficial to bold individuals in AM but not in WB and BL because the former could evoke neighbors to make the same response of defending against intruders but the latter could *** a personality trait may have the same genetic basis across species,its correlation with reproductive success depends largely on the life history style of a species.

关键词： Boldness Life history style Personality Reproductive success Transcriptome analysis

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Thermosphere joint observations by TM-1 constellations and Swarm-B during the April 2023 geomagnetic storm

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Earth and Planetary Physics 2024年第2期8卷 307-316页

作者： YongPing Li YueQiang Sun XianGuo Zhang JiangZhao Ai XiaoLiang Zheng Jia Li yujie wang BiBo Guo Feng Yan ShiLong Wei XinChun Tang YuanYuan Cao National Space Science Center Chinese Academy of SciencesBeijing 100190China Beijing Key Laboratory of Space Environment Exploration Beijing 100190China Key Laboratory of Science and Technology on Space Environment Situational Awareness Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Shenzhen Aerospace Dongfanghong Satellite LtdShenzhen 518057China

The response of thermosphere density to geomagnetic storms is a complicated physical ***-satellite joint observations at the same altitude but different local times(LTs)are important for understanding this process;however,until now such studies have hardly been *** this report,we analyze in detail the thermosphere mass density response at 510 km during the April 23−24,2023 geomagnetic storm using data derived from the TM-1(TianMu-1)satellite constellation and Swarm-B *** observations show that there were significant LT differences in the hemispheric asymmetry of the thermosphere mass density during the geomagnetic *** observed by satellite TM02 at nearly 11.3 and 23.3 LTs were larger in the northern hemisphere than in the *** TM04 dayside density observations appear to be almost symmetrical with respect to the equator,though southern hemisphere densities on the nightside were ***-B data exhibit near-symmetry between the *** addition,the mass density ratio results show that TM04 nightside observations,TM02 data,and Swarm-B data all clearly show stronger effects in the southern hemisphere,except for TM04 on the dayside,which suggest hemispheric *** South-North density enhancement differences in TM02 and TM04 on dayside can reach 130%,and Swarm-B data even achieve 180%*** the observations of all three satellites,large-scale traveling atmospheric disturbances(TADs)first appear at high latitudes and propagate to low latitudes,thereby disturbing the atmosphere above the equator and even into the opposite ***00 model simulations were also performed on this geomagnetic *** are absent in the NRLMSISE00 *** satellite data suggest that NRLMSISE00 significantly underestimates the magnitude of the density response of the thermosphere during geomagnetic storms,especially at high latitudes in both ***,use of the density simulation of NRLM

关键词： TM-1 constellation Swarm-B joint observations geomagnetic storm Local Times

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深埋隧洞地下水分层水力联系地表深孔监测技术与工程应用

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清华大学学报（自然科学版） 2024年第7期64卷 1226-1237页

作者：陈念张强汪小刚王玉杰王鹏王丹中国水利水电科学研究院流域水循环模拟与调控国家重点实验室北京100048 云南省滇中引水工程有限公司昆明650000

外水压力是深埋隧洞建设中面临的一个关键问题,由于深埋隧洞埋深大、地下水位高、地层间水力联系规律复杂,因此给深埋隧洞外水压力确定提出巨大挑战。厘清隧洞全生命周期地下水的水力联系规律,是准确评价深埋隧洞外水压力和隧洞建设影... 详细信息

外水压力是深埋隧洞建设中面临的一个关键问题,由于深埋隧洞埋深大、地下水位高、地层间水力联系规律复杂,因此给深埋隧洞外水压力确定提出巨大挑战。厘清隧洞全生命周期地下水的水力联系规律,是准确评价深埋隧洞外水压力和隧洞建设影响地下水环境的关键。该文采用数值模拟法研究不同地层类型对隧洞开挖后地下水演化规律的影响,在此基础上,提出一种深埋隧洞地下水分层水力联系地表深孔监测技术,并应用于滇中引水工程蔡家村隧洞。数值模拟结果显示:隧洞上方存在隔水地层对开挖后地下水水力联系有显著影响。工程实践应用不仅验证了该技术的可行性,还证实了深埋隧洞地下水水力联系存在分层现象。该文提出的深埋隧洞地下水分层水力联系地表深孔监测技术为深埋隧洞高外水压力的取值研究提供了有效手段。

关键词：深埋隧洞外水压力隔水地层分层水力联系地表深孔数值模拟

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结合评估奖惩机制和邻域动态退化的协同蚁群算法

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系统仿真学报 2024年第6期36卷 1475-1492页

作者：王育洁游晓明刘升上海工程技术大学上海201620

针对蚁群算法在求解旅行商问题中出现收敛速度慢以及易陷入局部最优等问题,提出一种结合评估奖惩机制和邻域动态退化的协同蚁群算法。根据路径评估值将路径划分为活跃路径和舍弃路径,以路径评估值作为权重对两类路径采取不同的信息素奖... 详细信息

针对蚁群算法在求解旅行商问题中出现收敛速度慢以及易陷入局部最优等问题,提出一种结合评估奖惩机制和邻域动态退化的协同蚁群算法。根据路径评估值将路径划分为活跃路径和舍弃路径,以路径评估值作为权重对两类路径采取不同的信息素奖惩策略,加快算法的收敛速度。采用邻域动态退化策略,利用邻域半径将城市集分为探索区和退化区,自适应缩小蚂蚁的搜索范围,通过保留概率动态保留部分退化区中的城市,结合探索区中的城市一并计算状态转移概率,平衡算法的收敛速度和种群的多样性。采取种间协同进化机制,根据Tanimoto相关系数确定种群间的交互周期,并在算法的不同阶段选择合适的交互方式帮助算法跳出局部最优,提高算法的求解精度,达到种群间有效交流的目的。

关键词：评估奖惩邻域退化 Tanimoto相关系数协同进化蚁群算法旅行商问题

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考虑长细比的岩土颗粒系统非稳态流动特征研究

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工程地质学报 2024年第1期32卷 1-7页

作者：黄雨王艺谙王宇杰同济大学土木工程学院上海200092 上海交通大学物理与天文学院上海200240

砂土等常见岩土颗粒系统在高速流动状态下具有显著的非稳态特征,其剪切速度分布与速度波动特征等均表现出显著的随机性。但目前颗粒系统细观特征对其宏观流动参数的影响尚不明确,针对岩土颗粒流动过程随机性特征参数的研究亟待加强。本... 详细信息

砂土等常见岩土颗粒系统在高速流动状态下具有显著的非稳态特征,其剪切速度分布与速度波动特征等均表现出显著的随机性。但目前颗粒系统细观特征对其宏观流动参数的影响尚不明确,针对岩土颗粒流动过程随机性特征参数的研究亟待加强。本文通过离散元环剪单元实验模拟,捕捉不同形状颗粒系统高速剪切流动过程中的宏微观特征。研究结果表明:(1)颗粒形状对系统宏观剪应力有较为显著的影响。颗粒长细比越大,其残余剪应力越大;(2)颗粒系统速度波动的空间分布同时受到剪切速度与边界效应两方面的影响。剪切速度越大,速度波动越大。边界对于颗粒速度波动具有一定的约束效应;(3)颗粒形状对系统速度波动大小有显著影响。颗粒越细长,微观速度波动越小;(4)形状特征对颗粒系统细观接触特征有显著影响。颗粒越细长,其平均配位数越大,出现较大粒间接触力的概率越小。

关键词：岩土颗粒流高速剪切颗粒形状 DEM 非稳态

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