检索结果-南通市图书馆

Engineering of Fe d-band center in Fe_(3)O_(4)/CeO_(2)hetero-nanoparticles via orbital coupling for high-efficiency oxygen reduction electrocatalysis

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2025年第1期18卷 129-139页

作者： Jiayi Liu Jingwen Yin Yingzi Lin Mingxin Pang Huan Pang Songtao Zhang Lin Xu jun yang Yawen Tang Jiangsu Key Laboratory of New Power Batteries Jiangsu Collaborative Innovation Center of Biomedical Functional MaterialsSchool of Chemistry and Materials ScienceNanjing Normal UniversityNanjing 210023Chin a 2 State Key Laboratory of Multiphase Complex Systems Center of MesoscienceInstitute of Process EngineeringChinese Academy of SciencesBeijing 100190China School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225009China Testing Center Yangzhou UniversityYangzhou 225009China

The deliberate engineering of the d-band center of metal site represents an effective strategy to boost the intrinsic electrocatalytic performance toward the oxygen reduction reaction(ORR).Herein,following a heterointerfaceinduced orbital coupling rationale,we report a judicious design of an efficient ORR electrocatalyst consisting of Fe_(3)O_(4)/CeO_(2)hetero-nanoparticles in-situ encased into N-doped carbon nanofibers(abbreviated as Fe_(3)O_(4)/CeO_(2)@N-CNFs hereafter).The theoretic calculations uncover that the Fe_(3)O_(4)/CeO_(2)heterointerface-triggered orbital coupling can cause the down shift of the d-band center positions of Fe sites,which leads to the weakened chemisorption of oxygenated groups and lowered energy barrier for the potential-determining step,ultimately dramatically boosting the ORR intrinsic *** a consequence,the well-designed Fe_(3)O_(4)/CeO_(2)@N-CNFs display admirable ORR activity with a half-wave potential of 0.84 V and outstanding structural/electrochemical stability in an alkaline electrolyte,surpassing the commercial Pt/C benchmark and a majority of recently reported Fe_(3)O_(4)-based *** encouragingly,the Fe_(3)O_(4)/CeO_(2)@N-CNFsincorporated Zn-air battery outperforms the Pt/C-assembled counterpart with higher power density,larger energy density,and excellent cycling stability,serving as a competent candidate for ORR-involved renewable energy *** study offers an innovative approach for the rational manipulation of the d-band center and interfacial electron behavior of active sites toward the optimization of electrocatalytic performance.

关键词： hetero-nanoparticles electrospinning interfacial engineering orbital coupling oxygen reduction reaction

Big data and the future of urban ecology:From the concept to results

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China Earth Sciences 2020年第10期63卷 1443-1456页

作者： jun yang Ministry of Education Key Laboratory for Earth System Modelling Department of Earth System ScienceTsinghua UniversityBeijing 100084China Tsinghua Urban Institute Beijing 100084China

Urban ecology is experiencing the third paradigm *** understand the interactions between the social system and the natural system in the city across time and space,and to provide theories and solutions to sustainable urban development are essential tasks for urban ecology in the next *** data can play a crucial role in future urban ecology studies due to the interdisciplinary nature of urban ecology,the fact that cities are factories of big data,and the new insights gained by using big data in ***,to translate big data from a concept to research results that can guide planning,policymaking,and management of cities,we need to overcome multiple challenges existing in the theoretical framework,data acquisition,and analytic *** ecologists should enhance the collaboration with the data scientists to increase the application of big data in studies of urban biodiversity,urban ecosystem services and human wellbeing,and processes of urban ecosystems.

关键词： Big data Social media Research paradigm Sustainable development Urban ecosystem

Condensation behavior of gaseous phase during transported in the near-substrate boundary layer of plasma spray-physical vapor deposition

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2021年第8期67卷 127-134页

作者： Mei-jun Liu Guan-jun yang State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and EngineeringXi'an fiaotong UniversityXi’anShaanxi710049PR China

Plasma spray-physical vapor deposition(PS-PVD)has exhibited the potential ability to prepare columnar structures for advanced thermal barrier coatings(TBCs).The coating structure is nominally affected by operating parameters,but it is controlled by the type of deposition unit actually and *** order to realize the columnar structure deposited by gaseous phase units,the transition behavior of gaseous phase units to clusters must be fundamentally *** work investigated the transport process of gaseous phase units in the PS-PVD near-substrate boundary layer along with the condensation *** Monte Carlo method was used to examine the transport process and condensation behavior of gaseous phase units under different scale boundary *** results show that it is easier to form more numerous larger clusters at the edge of the plasma jet than at the *** on the understanding of the changes in deposition unit caused by the condensation of gaseous phase in the near-substrate boundary layer of PS-PVD,an outlook towards TBCs with different structures is *** it is in good agreement with the experimental data.

关键词： Condensation behavior Transport process Cluster Boundary layer PS-PVD

An Adaptive Time-Domain Kalman Filtering Approach to Acoustic Feedback Cancellation for Hearing Aids

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Electronics 2020年第1期29卷 139-146页

作者： LU Caixia yang Feiran yang jun Key Laboratory of Noise and Vibration Research Institute of Acoustics of Chinese Academy of Science University of Chinese Academy of Science

The adaptive filtering approach has been widely used for acoustic feedback control in the hearing aids due to its excellent performance. The commonly used adaptive filtering algorithms employ a fixed step-size,which has to compromise between the initial convergence and the steady-state misalignment. Many variable stepsize adaptive algorithms have been proposed to handle this problem. In this paper, we propose a broadband Kalman filter to resolve this problem. The acoustic feedback path is modelled by a first-order Markov model,and the observation equation is constructed using more past data vector. A major issue in the hearing aids is the computational complexity. We thus present a simplified version to reduce the complexity, which bridges between the exact Kalman filter and the affine projection algorithm. The estimation of the process and measurement noise variance is discussed in detail. A two-feedbackpath model is adopted to improve the algorithm’s lack of re-convergence. Simulation results confirm the proposed algorithm clearly outperforms the other variable step-size adaptive filtering approaches.

关键词： Acoustic feedback cancellation Kalman filter Convergence rate Tracking capability

Frequency　response　of　tiltmeters　and　tidal　factor

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Acta Seismologica Sinica(English Edition) 1998年第4期11卷 455-465页

作者： jun yang Seismological Bureau of Jiangsu Province Nanjing China

ＦｒｅｑｕｅｎｃｙｒｅｓｐｏｎｓｅｏｆｔｉｌｔｍｅｔｅｒｓａｎｄｔｉｄａｌｆａｃｔｏｒＪＵＮＹＡＮＧ（杨军）ＳｅｉｓｍｏｌｏｇｉｃａｌＢｕｒｅａｕｏｆＪｉａｎｇｓｕＰｒｏｖｉｎｃｅ，Ｎａｎｊｉｎｇ２１００１４．Ｃｈｉ... 详细信息

ＦｒｅｑｕｅｎｃｙｒｅｓｐｏｎｓｅｏｆｔｉｌｔｍｅｔｅｒｓａｎｄｔｉｄａｌｆａｃｔｏｒＪＵＮＹＡＮＧ（杨军）ＳｅｉｓｍｏｌｏｇｉｃａｌＢｕｒｅａｕｏｆＪｉａｎｇｓｕＰｒｏｖｉｎｃｅ，Ｎａｎｊｉｎｇ２１００１４．ＣｈｉｎａＡｂｓｔｒａｃｔＴｈｅｒｅｌａ...

关键词： tiltmeters and factor response Frequency

Model and algorithm of flow interception problem with multi-type of flows

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2009年第4期20卷 755-761页

作者： Hu Dandan yang Chao yang jun Dept. of Management Science and Engineering Huazhong Univ. of Science and Technology Wuhan 430074 P. R. China

To study simultaneous location of different kinds of facilities, a new model of flow interception problem with multi-type of flows is proposed, with the consideration of multi-purpose flows and the influence of facilities on each other. To be more practical, the objective is to maximize the benefits from flow-by customers instead of maximizing flows in the past. Since this problem is NP-hard and there is no optimal solution for large network, greedy and improved greedy heuristic algorithms are proposed. A computational example is presented to show that the optimal location decisions are proved to be strongly dependent on the influence coefficients and average profits by one customer and different types of facilities are almost co-located. Finally the results of sensitivity analysis are reported.

关键词： location flow interception greedy heuristic multi-purpose influence coefficient

Influence of pile spacing on seismic response of piled raft in soft clay: centrifuge modeling

在线全文

学校读者我要写书评

暂无评论

Earthquake Engineering and Engineering Vibration 2019年第4期18卷 719-733页

作者： yang jun yang Min Chen Haibing Guangzhou Municipal Engineering Testing Co. Ltd Guangzhou 510060 China School of Civil Engineering and Transportation South China University of Technology Guangzhou 510641 China Department of Geotechnical Engineering Tongji University Shanghai 200092 China Institute of Foundation and Structure Technologies Zhejiang Sci-Tech University Hangzhou 310018 China

In order to study the infl uence of pile spacing on the seismic response of piled raft in soft clay, a series of shaking table tests were conducted by using a geotechnical centrifuge. The dynamic behavior of acceleration, displacement and internal forces was examined. The test results indicate that the seismic acceleration responses of models are generally greater than the surrounding soil surface in the period ranges of 2–10 seconds. Foundation instant settlements for 4×4 and 3×3 piled raft (with pile spacing equal to 4 and 6 times pile diameter) are somewhat close to each other at the end of the earthquake, but reconsolidation settlements are greater for 3×3 piled raft. The seismic acceleration of superstructure, the uneven settlement of the foundation and the maximum bending moment of pile are relatively lower for 3×3 piled raft. Successive earthquakes lead to the softening behavior of soft clay, which causes a reduction of the pile bearing capacity and thus loads are transferred from the pile group to the raft. For the case of a 3×3 piled raft, there is relatively smaller change of the load sharing ratio of the pile group and raft after the earthquake and the distribution of maximum bending moments at the pile head is more uniform.

关键词： piled raft pile spacing soft clay dynamic centrifuge model test seismic response subsidence load sharing bending moment

Budget constrained flow interception location model for congested systems

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2009年第6期20卷 1255-1262页

作者： Hu Dandan yang Chao yang jun Dept. of Management Science and Engineering Huazhong Univ. of Science and Technology Wuhan 430074 P. R. China

To study location problems with congestion demand, a bi-objective model based on flow intercep-tion problem is *** model is formulated from the view of M/M/m queuing *** quantity and quality are simultaneously considered as objectives, with constraint on total *** quality includes deviation distance from preplanned trips and customers＇ waiting *** quantity is the number of intercep-tion customers.A multi-objective evolutionary algorithm combined with greedy heuristic is *** a computational experiment is given, and the algorithm is proved to be efficient.

关键词： location flow interception bi-objective heuristic.

A Privacy-preserving Algorithm for AC Microgrid Cyber-physical System Against False Data Injection Attacks

在线全文

学校读者我要写书评

暂无评论

Journal of Modern Power Systems and Clean Energy 2023年第5期11卷 1646-1658页

作者： jun yang Yu Zhang College of Information Science and Engineering Northeastern UniversityShenyangChina Liaoning Provincial Transportation Planning and Design Institute Co. Ltd.ShenyangChina

A new privacy-preserving algorithm based on the Paillier cryptosystem including a new cooperative control strategy is proposed in this paper, which can resist the false data injection(FDI) attack based on the finite-time control theory and the data encryption strategy. Compared with the existing algorithms, the proposed privacy-preserving algorithm avoids the direct transmission of the ciphertext of frequency data in communication links while avoiding complex iterations and communications. It builds a secure data transmission environment that can ensure data security in the AC microgrid cyber-physical system(CPS). This algorithm provides effective protection for AC microgrid CPS in different cases of FDI attacks. At the same time, it can completely eliminate the adverse effects caused by the FDI attack. Finally, the effectiveness, security, and advantages of this algorithm are verified in the improved IEEE 34-node test microgrid system with six distributed generators(DGs) in different cases of FDI attacks.

关键词： AC microgrid cyber-physical system(CPS) distributed cooperative control false data injection(FDI)attack Paillier cryptosystem