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Revealing efficient catalytic performance of N-CuO_(x) for aerobic oxidative coupling of aliphatic alkynes:A Langmuir-Hinshelwood reaction mechanism

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Nano Research 2022年第7期15卷 6076-6083页

作者： Jun Tang Bowen Jiao Wei Chen Fei Ruan Fengfeng Li Peixin Cui Chao Wan Minh Ngoc Ha Van Noi Nguyen Qingping Ke College of Chemistry and Chemical Engineering Anhui University of TechnologyMaanshan 243002China Key Laboratory of Carbon Materials of Zhejiang Province College of Chemistry and Materials EngineeringWenzhou UniversityWenzhou 325035China Key Laboratory of Soil Environment and Pollution Remediation Institute of Soil Sciencethe Chinese Academy of SciencesNanjing 210008China VNU Key Laboratory of Advanced Material for Green Growth VNU University of ScienceVietnam National UniversityHanoi 100000Vietnam

O_(x)idative couplings of aliphatic alkynes are crucial for the production of naturally occurring 1,*** we report the novel approach for effective synthesis of unsaturated coordinated N doped copper oxides(N-CuO_(x))catalyst,and uncover that N-CuO_(x) catalyst as an additive-free and cost-effective heterogeneous catalyst has highly catalytic performance for directly oxidative coupling of aliphatic *** key to achieve efficient oxidative coupling of aliphatic alkynes is the synergistic effect of N species and uncoordinated O/Cu species caused by N dopants,which undergoes the Langmuir–Hinshelwood reaction *** N-CuO_(x) catalyst displays~89.1%yield for hexadeca-7,9-diyne under mild conditions and stable reusability(5 cycles),showing significant advances compared with the traditionally copper *** findings highlight the heteroatom dopants that provide a new methodology for designing efficient copper catalysts in synthesis of naturally occurring 1,3-diynes.

关键词： N doped copper oxides(N-CuO_(x)) straight chain alkynes homo-coupling additive-free 1,3-diynes

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Green synthesis of functional metallic nanoparticles by dissimilatory metal-reducing bacteria“Shewanella”:A comprehensive review

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Journal of Materials science & technology 2023年第27期158卷 63-76页

作者： Jing Yang Peng Ju Xucheng Dong Jizhou Duan Hui Xiao Xuexi Tang Xiaofan Zhai Baorong Hou CAS Key Laboratory of Marine Environmental Corrosion and Bio-fouling Institute of OceanologyChinese Academy of SciencesQingdao 266071China Open studio for marine Corrosion and Protection Qingdao National Laboratory for Marine Science and TechnologyQingdao 266235China College of Marine Life Sciences Ocean University of ChinaQingdao 266003China Key Laboratory of Marine Eco-Environmental Science and Technology Marine Bioresource and Environment Research CenterFirst Institute of OceanographyMinistry of Natural ResourcesQingdao 266061China Sanya Institute of Ocean Eco-Environmental Engineering Sanya 572000China Institute of Marine Corrosion Protection Guangxi Key Laboratory of Marine Environmental ScienceGuangxi Academy of SciencesNanning 530007China

The biosynthesis strategy of nanoparticles has attracted much attention due to the mild synthesis condi-tions,environmental-friendly properties,and low *** nanoparticles(bio-NPs)not only show excellent physicochemical properties,but also exhibit high stability,enlarged specific surface area,and excellent biocompatibility,which are crucial for industrial,agricultural,and medical ***-wanella,a kind of dissimilatory metal-reducing bacteria,is regarded as a typical biosynthesis-functional bacteria class with wide distribution and strong ***,in this paper,functional bio-NPs by Shewanella were reviewed to provide a comprehensive view of current research *** biosynthetic mechanisms of Shewanella are summarized as the Mtr pathway(predominant),extracellular polymeric substance-induced pathway,and enzyme/protein-induced *** the biosynthesis process,bio-logical factors along with the physicochemical parameters highly influenced the properties of the resul-tant *** now,bio-NPs have been applied in various fields including environmental remediation,antibacterial applications,and microbial fuel ***,some challenging issues of bio-NPs by She-wanella remain unsolved,such as optimizing suitable bacterial strains,intelligently controlling bio-NPs,clarifying biosynthesis mechanisms,and expanding bio-NPs applications.

关键词： Shewanella strains Functional metallic nanoparticles Green biosynthesis Metal reduction

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High-temperature tribological properties of tungsten carbide reinforced high-entropy-alloy composite coating by laser cladding

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Ceramics International 2025年第14期51卷 19485-19496页

作者： Wu, Wenxing Liu, Hanxia Jin, Xuming Guo, Liangliang Zhu, Tao Hu, Liangbin Yang, Chao Chen, Pinghu Qiu, Changjun Chu, Paul K. College of Nuclear Science and Technology University of South China Hengyang421001 China School of Electrical Engineering University of South China Hengyang421001 China Key Laboratory of Hunan Province of Equipment Safety Service Technology Under Extreme Environment College of Mechanical Engineering University of South China Hengyang421001 China National Engineering Research Center of Light Alloy Net Forming School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai200240 China Department of Materials Science & Engineering City University of Hong Kong Tat Chee Avenue Kowloon999077 China

To solve the serious wear problem of mold steels at a high temperature, a 15 wt% WCp (Tungsten Carbide particles) reinforced Fe50Mn30Cr10Co10 HEA (High Entropy Alloy) composite coating is fabricated by laser cladding to improve the high-temperature wear resistance based on high hardness and thermal stability of HEA. Tribological tests are carried out at different temperature, and the wear mechanism is explored. The experimental results reveal three main phases of γ-Fe, WC, and W2C in the LCed (Laser Cladded) HEA composite coating. Small amounts of nanoscale WC and MnO are precipitated to enhance the mechanical properties. The variation rule pertaining to the volume wear rate is that the values rise first and fall later with increasing temperature. The maximum wear rate is observed above 5 × 10−5 mm3/N·m at 400 °C. Although the hardness may diminish with increasing temperature in theory, the relative wear resistance can be improved because the oxide could enhance the supportive capacity and isolating effects of the glaze layer between the friction pair. Fe2O3 can be considered a solid lubricant to reduce the wear rate. With increasing friction temperature, the wear mechanism changes from typical abrasive/fatigue wear to adhesive/delamination wear. Consequently, the 15 wt% WCp-reinforced HEA composite shows excellent wear resistance at 800 °C relative to H13 steel and the results provide the theoretical and experimental basis for liquid die forging. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Composite coatings

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Direct visualisation of metal-defect cooperative catalysis in Ru-doped defective MOF-808

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Journal of Materials Chemistry A 2024年第30期12卷 19018-19028页

作者： Xu, Chirui Orbell, William Wang, Guilian Li, Boye Ng, Bryan K. Y. Wu, Tai-Sing Soo, Yun-Liang Luan, Zhao-Xue Tang, Kangjian Wu, Xin-Ping Tsang, S. C. Edman Zhao, Pu Innovation Center for Chemical Science College of Chemistry Chemical Engineering and Materials Science Soochow University Suzhou215123 China Department of Chemistry University of Oxford OxfordOX1 3QR United Kingdom State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China National Synchrotron Radiation Research Center Hsinchu30076 Taiwan Department of Physics National Tsing Hua University Hsin-chu30013 Taiwan State Key Laboratory of Green Chemical Engineering and Industrial Catalysis Centre for Computational Chemistry Research Institute of Industrial Catalysis School of Chemistry and Molecular Engineering East China University of Science and Technology Shanghai200237 China

Improving the efficiency of catalytic materials is vital to the chemical and energy industries. Constructing neighbouring active sites in metal-organic framework (MOF) materials for cooperative catalysis is a promising way to achieve the above goal. However, it is difficult to fine-tune active sites at the atomic level due to the challenge of visualising their local structures and their interaction with substrates. In this article, we report the direct visualisation of metal and defect active sites and binding of the phenol substrate in Ru-doped defective MOF-808. X-ray absorption spectroscopy, X-ray pair distribution function analysis, X-ray powder diffraction, and infrared spectroscopy reveal that the enhanced selective hydrogenation originates from the specific adsorption geometry of phenol over 7-centred Ru clusters and hydroxyl or water of defect sites. This mechanism also well explains the high catalytic activity in CO2 reduction. This work represents the first example of structural elucidation of metal-defect cooperative catalysis in MOFs and will lead to the rational design of new superactive MOF catalysts. © 2024 The Royal Society of Chemistry.

关键词： Substrates

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Insights into the characteristics of corrosion products formed on the contact and exposed regions of C1045 steel bolt and nut fasteners exposed to aqueous chloride environments

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Journal of Materials science & technology 2023年第4期135卷 250-264页

作者： Enobong Felix Daniel Chao Li Changgang Wang Junhua Dong Inime Ime Udoh Peter Chukwuemeka Okafor Dongjiu Zhang Wenan Zhong Sheng Zhong School of Materials Science and Engineering University of Science and Technology of ChinaHefei 230026China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Environmental and Chemical Engineering Shenyang Ligong UniversityShenyang 110159China Corrosion and Electrochemistry unit Department of Pure and Applied ChemistryUniversity of CalabarP.M.B 1115 CalabarCross River StateNigeria Key Laboratory of Space Launching Site Reliability Xichang Satellite Launch CenterHainan Haikou 571126China

This study investigated the characteristics of corrosion products formed on the contact and exposed re-gions of C1045 steel bolt and nut fasteners exposed to aqueous chloride *** corroded sur-face morphology,rust compositions,and corrosion kinetics of the bolt specimen were studied by visual observation,optical microscopy(OM),scanning electron microscopy(SEM),X-Ray diffractometry(XRD),micro-Raman,electron probe micro-analyser(EPMA),and potentiodynamic polarization ***-sults obtained showed a variation in corrosion kinetics,morphology,and composition of the rust layer which were driven by differential aeration and concentration *** to the availability of sufficient dissolved oxygen,the oxyhydroxide compound,lepidocrocite(γ-FeOOH)was detected in the outer rust layer in the exposed region,whereas the inner rust layer was composed of magnetite(Fe_(3)O_(4)).How-ever,the oxygen-deficient contact surface revealed the presence of akaganeite(β-FeOOH)and magnetite(Fe_(3)O_(4))as dominant oxide *** most stable phase,goethite(α-FeOOH)was also detected in the rust formed in both regions,though in significantly low ***,owing to variation in environmental conditions,the amount and density of the rust layer varied in the different *** estimated corrosion stability values for the different regions revealed that the corrosion products formed on the steel surfaces were non-protective,suggesting the need for specific surface treatment as a protec-tive measure.

关键词： Carbon steel Bolt-nut fastener Raman SEM-EDS XRD Rust characterization

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Multi-functional layered double hydroxides supported by nanoporous gold toward overall hydrazine splitting

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Frontiers of Chemical science and engineering 2024年第1期18卷 61-69页

作者： Yongji Qin Huijie Cao Qian Liu Shaoqing Yang Xincai Feng Hao Wang Meiling Lian Dongxing Zhang Hua Wang Jun Luo Xijun Liu ShenSi Lab Shenzhen Institute for Advanced StudyUniversity of Electronic Science and Technology of ChinaShenzhen 518110China Institute for New Energy Materials and Low-Carbon Technologies School of Materials Science and EngineeringTianjin University of TechnologyTianjin 300384China State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured MaterialsSchool of ResourcesEnvironment and MaterialsGuangxi UniversityNanning 530004China Institute for Advanced Study Chengdu UniversityChengdu 610106China China National Coal Group Corporation Beijing 100120China Tianjin Engineering Research Center of Civil Aviation Energy Environment and Green Development School of Transportation Science and EngineeringCivil Aviation University of ChinaTianjin 300300China

Layered double hydroxides have demonstrated great potential for the oxygen evolution reaction,which is a crucial half-reaction of overall water ***,it remains challenging to apply layered double hydroxides in other electrochemical reactions with high efficiency and ***,we report two-dimensional multifunctional layered double hydroxides derived from metalorganic framework sheet precursors supported by nanoporous gold with high porosity,which exhibit appealing performances toward oxygen/hydrogen evolution reactions,hydrazine oxidation reaction,and overall hydrazine *** as-prepared catalyst only requires an overpotential of 233 mV to reach 10 mA·cm^(-2) toward oxygen evolution *** overall hydrazine splitting cell only needs a cell voltage of 0.984 V to deliver 10 mA·cm^(-2),which is far more superior than that of the overall water splitting system(1.849 V).The appealing performances of the catalyst can be contributed to the synergistic effect between the metal components of the layered double hydroxides and the supporting effect of the nanoporous gold substrate,which could endow the sample with high surface area and excellent conductivity,resulting in superior activity and stability.

关键词： layered double hydroxide oxygen evolution reaction hydrazine oxidation reaction overall hydrazine splitting hydrogen production

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A Dent Defect Identification and Quantization Algorithm of Buried Pipeline Via the IMU Data 5

A Dent Defect Identification and Quantization Algorithm of B...

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5th International Conference on Electronic Communication and Artificial Intelligence, ICECAI 2024

作者： Zhang, Hongning Shi, Tong Duan, Qingquan Liu, Xiaoben Song, Chenxi Li, Rui Fu, Kuang China University of Petroleum-Beijing National Engineering Research Center for Pipeline Safety Moe Key Laboratory of Petroleum Engineering Beijing Key Laboratory of Urban Oil and Gas Distribution Technology Beijing China Safety Environment & Technology Supervision Research Institute Southwest Oil and Gas Field Company Petro China Chengdu China PipeChina Institute of Science and Technology Tianjin Tianjin China

ISBN: (纸本)9798350386943

Oil and gas pipelines cross various complex terrains. Gular internal inspections are key for their safe and efficient function. Recently, the Inertial Measurement Unit (IMU) has been widely applied in pipeline inspections for its low cost, high precision, and suitability for long distances. However, current research by scholars internationally and domestically primarily focuses on pipeline strain identification using inertial navigation. There is a lack of intelligent identification and quantitative analysis for the size of dents in long-distance oil and gas pipelines based on inertial navigation data. Addressing this gap, this paper introduces a quantitative dent identification method for pipelines using a CNN-LSTM-Attention hybrid neural network. Initially, IMU inspection data undergo preprocessing and dimensionality reduction via the Principal Component Analysis (PCA) algorithm. A deep learning model comprising a CNN-LSTM-Attention neural network is constructed, capable of autonomously learning and identifying pipeline dent characteristics, optimizing the learning rate, and generating non-linear output, thereby realizing quantitative dent detection. The findings indicate that the proposed deep learning model possesses robust recognition and quantification capabilities, suitable for IMU data from pipeline internal inspections. The presented technical method effectively identifies and quantifies pipeline dent dimensions. Comparisons of convergence speeds at various learning rates revealed faster convergence at 0.001, with an accuracy of 92.4%. This allows for high-precision quantitative identification of pipeline dents, providing theoretical and technical support for the safety assessment of pipeline operations. © 2024 IEEE.

关键词： Dimensionality reduction

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Amplitude variation with offset and azimuth inversion to predict and evaluate coal seam fracture parameters

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Frontiers of Earth science 2023年第2期17卷 505-513页

作者： Haibo WU Shujie ZHU Qinjie LIU Shouhua DONG Yanhui HUANG Pingsong ZHANG School of Earth and Environment Anhui University of Science and TechnologyHuainan 232001China Institute of Energy Hefei Comprehensive National Science Center(Anhui Energy Laboratory)Hefei 230051China Xi’an Research Institute China Coal Technology&Engineering GroupXi’an 710076China School of Resources and Geosciences China University of Mining and TechnologyXuzhou 221116China State Key Laboratory of Petroleum Resources and Prospecting China University of PetroleumBeijing 102249China

Amplitude variation with offset and azimuth(AVOA)inversion is a mainstream method for predicting and evaluating fracture parameters of conventional oil and gas ***,its application to coal seams is limited because of the specificity of the equivalent media model for coal—also,the traditional seismic acquisition system employed in coal fields falls within a narrow *** this study,we initially derived a P‒P wave reflection coefficient approximation formula for coal seams,which is directly expressed in terms of fracture parameters using the Schoenberg linear-slide model and Hudson *** analyzed the P‒P wave reflection coefficient’s response to the fracture parameters using a two-layer forward ***,we designed a twostep inversion workflow for AVOA inversion of the fracture ***,high-density wide-azimuth pre-stack 3D seismic data were utilized for inverting the fracture density and strike of the target coal *** inversion accuracy was constrained by Student’s tdistribution *** analysis and validation of the inversion results revealed that the relative fracture density corresponds to fault locations,with the strike of the fractures and faults mainly at 0°.Therefore,the AVOA inversion method and technical workflow proposed here can be used to efficiently predict and evaluate fracture parameters of coal seams.

关键词： equivalent media model fracture density and strike azimuth Student’s t-distribution

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Distinct taxonomic and ecological functions of microbiome in sediments of different depth in Bohai Sea and Yellow Sea

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Journal of Oceanology and Limnology 2023年第5期41卷 1765-1780页

作者： Siqi LI Ye CHEN Lun SONG Tiezhu MI Yu ZHEN Zhigang YU College of Marine Life Science Ocean University of ChinaQingdao 266003China Laboratory for Marine Ecology and Environmental Science Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237Chin Key Laboratory of Marine Environment and Ecology Ministry of EducationOcean University of ChinaQingdao 266100China Key Laboratory of Gas Hydrate Ministry of Natural ResourcesQingdao Institute of Marine GeologyQingdao 266071China Liaoning Ocean and Fisheries Science Research Institute Dalian 116023China College of Environmental Science and Engineering Ocean University of ChinaQingdao 266100China Key Laboratory of Marine Chemistry Theory and Technology Ministry of Education/Institute for Advanced Ocean StudyOcean University of ChinaQingdao 266100China

Microorganisms in sediments are critical to marine *** microbial communities in marine sediments of the Bohai Sea(BS)and Yellow Sea(YS),the eastern Chinese marginal seas,were uncovered in employing the metagenomic *** addition,the taxonomic and functional compositions of microbes were compared among various sediment core *** showing the compositions,diversities,and functions of the microbial communities showed no significant variations with sea areas,and significant seasonal variations was observed in station 3500-7 only on functions of the microbial ***,the compositions,diversities,and functions of the microbial communities changed noticeably in different sediment depths in close correlation with physical and chemical properties of ***,the large fraction of the variation in functional communities remained *** bioinformatic analysis of the metagenomic data,the carbon-metabolismrelated genes such as glycosyl transferase(GT),glycoside hydrolase(GH),and carbohydrate esterase(CE)genes were rich in the microbial community,especially in the top sediment ***,in this N-polluted habitat,nitrification and anaerobic ammonia oxidation(anammox)were dominant in the top sediment depth,whereas dissimilatory nitrate reduction to ammonium(DNRA)and denitrification were dominant in the middle and bottom depth,*** identification of possible biogeochemical links suggested that Gammaproteobacteria,Alphaproteobacteria,Nitrospirae,Nitrospinae,Chloroflexi,and Methanomicrobia might promote effective circulation of carbon and nitrogen *** study expanded our knowledge about the structure and functional potential of microbial communities associated with different sediment depth,and provided further comprehensive information on element cycles in marine environments.

关键词： microbial community function metagenome sequencing marine sediments

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Adaptive Coanda jet control for performance improvement of a highly loaded compressor cascade

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Propulsion and Power Research 2024年第4期13卷 534-552页

作者： Jian Zhang Min Zhang Juan Du Kai Yue Xinyi Wangf Chen Yang Hongwu Zhang School of Energy Power and Mechanical Engineering North China Electric Power UniversityBeijing 100096China Digital Twin Research Center Institute of Engineering ThermophysicsChinese Academy of SciencesBeijing 100190China Advanced Gas Turbine Laboratory Institute of Engineering ThermophysicsChinese Academy of Sciences Beijing 100190China National Key Laboratory of Science and Technology on Advanced Light-duty Gas-turbine Chinese Academy of SciencesBeijing 100190China School of Engineering Science University of Chinese Academy of SciencesBeijing 100049China School of Energy and Environment Engineering University of Science&Technology BeijingBeijing 100083China

Gas turbine is a promising device for power generation and propulsion either using traditional or renewable energy *** of its key problems is the flow instability of compressors especially with the increase in blade load and changeable working *** intelligently and efficiently inhibit flow separation and enhance the pressure rise ability of highly loaded compressors under variable operating conditions,a novel flow control technique termed as adaptive Coanda jet control(ACJC)is proposed in this paper for a compressor stator cascade with a high diffusion factor of *** realize the ACJC strategy,an incidence angle(IA)prediction model and an optimal injection mass flow rate(OIMFR)prediction model are established by adopting single factor analysis of variance,principal component analysis and Back Propagation Neural Network(BPNN)*** inlet Mach numbers including 0.1 and 0.4 are considered to represent incompressible and compressible flow conditions,and different inlet incidence angles are involved to model various off-design working situations of the real *** of the ACJC system is evaluated using numerical simulations are performed to understand the effects of the injection mass flow ratio on the flow field and aerodynamic performance of the blade *** indicate that the ACJC system can accurately predict the optimal injection mass flow ratio that can achieve the minimum flow loss at each incidence *** to the cascade without ACJC under the incidence angel of 5,the optimal injection mass flow ratio being 1.27%and 1.20%can reduce the total pressure loss coefficient by 18.88%and 21.56%for incoming Mach number being 0.1 and 0.4,respectively.

关键词： Gas turbine Highly loaded compressor Flow control technique Adaptive Coanda jet control Aerodynamic performance

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