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precise tracking of tip-induced structural variation at the single-chemical-bond limit

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Light(Science & Applications) 2023年第1期12卷 15-16页

作者： Sayantan Mahapatra nan Jiang Department of Chemistry University of Illinois ChicagoChicagoIL 60607USA

Sub-nanometer-resolved TERS provides a systematic way for investigating tip-molecule interaction and molecular motions,enabling a promising approach to examine on-surface reaction mechanisms and catalysis at the micro... 详细信息

关键词： level. limit catalysis

Effect of vanadium addition on microstructure and properties of AI_(0.5)Cr_(0.9)FeNi_(2.5)multi-principal alloys

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Journal of Iron and Steel Research International 2021年第5期28卷 586-596页

作者： De-xi Hao nan-nan Zhang Yue Zhang De-yuan Li Department of Material Science and Engineering Shenyang University of TechnologyShenyang 110870LiaoningChina provincial Key Laboratory of Advanced Welding Technology and Automation Shenyang 110870LiaoningChina

AI_(0.5)Cr_(0.9)FeNi_(2.5)V_(x)(x=0,0.2,0.4,0.6,0.8,1.0)multi-principal alloys were prepared by vacuum arc *** effect of vanadium addition on its microstructure and properties was *** results show that the alloys of all components exhibited an FCC single-phase *** the addition of vanadium,the microstructure of the alloy changed from dendrites to equiaxed crystals,the grains were remarkably refined,and the layered CrV phase was exhibited,which improved the properties of the *** yield strength of the alloy was slightly improved,and the alloys with various components presented good *** V content reached 0.8,the yield strength was 600 Mpa,and no fracture ***-wear testing showed that the wear debris was reduced with the addition of V *** sample with V element content of 0.4 had the best friction and wear *** surface grooves became shallow,the worn debris was less,and the wear mechanism was mainly abrasive *** polarisation curve showed that the alloy with V element content of 0.2 has the best corrosion *** passivation interval reached 900 *** corrosion potential and the corrosion current density were-496.299 mV and 2.759μA/cm^(2),respectively.

关键词： Multi-principal alloy Vacuum arc melting CrV phase Adhesive wear Electrochemical testing

Shape Coexistence for ^179Hg in Relativistic Mean-Field Theory

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Communications in Theoretical physics 2005年第4X期44卷 675-678页

作者： WANG nan College of Science Shenzhen University Shenzhen 518060 China Institute of Theoretical physics the Chinese Academy of Sciences Beijing 100080 China School of physics Peking University Beijing 100871 China Center of Theoretical Nuclear physics National Laboratory of Heavy Ion AcceleratorLanzhou 730000 China

The potential energy surface of179 Hg is traced and the multi-shape coexistence phenomenon in that nucleus is studied within the relativistic mean-field theory with quadrupole moment constraint. The calculation result... 详细信息

关键词： relativistic mean-field theory shape coexistence binding energy

On the number of matchings of graphs formed by a graph operation

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Science China Mathematics 2006年第10期49卷 1383-1391页

作者： YEH Yeong-nan Institute of Mathematics Academia Sinica

Let G be a simple graph. Define R(G) to be the graph obtained from G by adding a new vertex e* corresponding to each edge e = (a, b) of G and by joining each new vertex e* to the end vertices a and b of the edge e corresponding to it. In this paper, we prove that the number of matchings of R(G) is completely determined by the degree sequence of vertices of G.

关键词： matching, Hosoya index, matching polynomial, oriented incident matrix,skew adjacency matrix.

Rational design of bimetallic catalysts for electrochemical CO_(2)reduction reaction:A review

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Science China Chemistry 2023年第5期66卷 1288-1317页

作者： Minhan Li Jia-nan Zhang College of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China

The electrochemical CO_(2)reduction reaction(eCO_(2)RR)is a compelling approach to convert CO_(2)into high-value fuels and chemicals using renewable *** rational design of catalysts is of great importance for achieving outstanding performance of this ***-based catalysts have been drawing enormous attention in eCO_(2)RR due to their excellent catalytic performance and flexible *** the pursuit of overcoming the inherent disadvantages of monometallic catalysts and achieving breakthroughs in the catalytic performance,bimetallic strategy has been receiving extensive concerns and achieving remarkable results over *** this review,we attempt to give a comprehensive review on the bimetallic catalysts that are used for eCO_(2)*** effects in bimetallic catalysts that contribute to the enhanced eCO_(2)RR performance are first analyzed,demonstrating the superiority of bimetallic ***,the structural design of bimetallic catalysts is discussed as it plays a key role in eCO_(2)***,the current advances and rules of selectivity of bimetallic catalysts in eCO_(2)RR are summarized based on the selectivity *** reviewing efforts devoted in this field,this review is believed to present a timely overview of the progress of bimetallic eCO_(2)RR catalysts and to offer potential future directions in the aim of developing highly efficient catalysts for eCO_(2)RR.

关键词： electrochemical CO_(2)reduction bimetallic catalyst electronic effect tandem effect structural design

Infinite Horizon Backward Doubly Stochastic Differential Equations with Non-degenerate Terminal Functions and Their Stationary property

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Acta Mathematicae Applicatae Sinica 2016年第2期32卷 407-422页

作者： Hui-nan LENG Department of Mathematics East China University of Science and Technology

In this paper we consider infinite horizon backward doubly stochastic differential equations （BDS- DEs for short） coupled with forward stochastic differential equations, whose terminal functions are non-degenerate. For such kind of BDSDEs, we study the existence and uniqueness of their solutions taking values in weighted Lp（dx）¤L2（dx）space （p _〉 2）, and obtain the stationary property for the solutions.

关键词： backward doubly stochastic differential equations infinite horizon non-degenerate terminal func-tion stationary property

Hygrothermal effect on high-velocity impact resistance of woven composites

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Defence Technology（防务技术） 2022年第5期18卷 823-833页

作者： Xiao-chen Yang nan Jia School of Urban Construction Eastern Liaoning UniversityWenhua 325Dandong118003China College of Safety Science and Engineering Liaoning Technical UniversityFuxin123000China China Coal Technology&Engineering Group Shenyang Research Institute Fushun113122China State Key Laboratory of Coal Mine Safety Technology Fushun113122China

The woven glass fiber reinforced composites(GFRp)subjected to high-speed impact is investigated to identify the hygrothermal aging effect on the impact *** the hygrothermal aged and unaged glass/epoxy laminates are subjected to different impact velocities,which is confirmed as a sensitive factor for the failure modes and *** results show the hygrothermal aging effect decreases the ballistic limit by 14.9%,but the influence on ballistic performance is limited within the impact velocity closed to the ballistic *** failure modes and energy dissipation mechanisms are confirmed to be slightly influenced by the hygrothermal aging *** hygrothermal aging effect induced localization of structural deformation and degradation of mechanical properties are the main reasons for the composite undergoing the same failure modes at smaller impact *** on the energy absorption mechanisms,analytical expressions predict the ballistic limit and energy absorption to reasonable accuracy,the underestimated total energy absorption results in a relatively poor agreement between the measured and predicted energy absorption efficiency.

关键词： Hygrothermal aging effect Woven glass/epoxy composite Impact resistance Dynamic failure Energy absorption

Weighted pseudo Asymptotically periodic Mild Solutions of Evolution Equations

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Acta Mathematica Sinica,English Series 2015年第8期31卷 1215-1232页

作者： Zhi nan XIA Department of Applied Mathematics Zhejiang University of Technology

In this paper, we propose a new class of functions called weighted pseudo S-asymptotically periodic function in the Stepanov sense and explore its properties in Banach space including composition theorems. Furthermore, the existence, uniqueness of the weighted pseudo S-asymptotically periodic mild solutions to partial evolution equations and nonautonomous semilinear evolution equations are investigated. Some interesting examples are presented to illustrate the main findings.

关键词： Sp-weighted pseudo S-asymptotic periodicity weighted pseudo S-asymptotic periodicity evolution equations mild solutions

Black hole binaries and microquasars

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Frontiers of physics 2013年第6期8卷 630-660页

作者： Shuang-nan Zhang Laboratory for particle Astrophysics Institute of High Energy Physics Beijing 100049 China National Astronomical Observatories Chinese Academy of Sciences Beijing 100012 China

This is a general review Oil the observations and physics of black hole X-ray binaries and microquasars, with the emphasize on recent developments in the high energy regime. The focus is put on understanding the accretion flows and measuring the parameters of black holes in them. It includes mainly two parts： i） Brief review of several recent review article on this subject; ii） Further development on several topics, including black hole spin measurements, hot accretion flows, corona formation, state transitions and thermal stability of standard think disk. This is thus not a regular bottom-up approach, which I feel not necessary at this stage. Major effort is made in making and incorporating from many sources useful plots and illustrations, in order to make this article more comprehensible to non-expert readers. In the end I attempt to make a unification scheme on the accretion-outflow （wind/jet） connections of all types of aecreting BHs of all accretion rates and all BH mass scales, and finally provide a brief outlook.

关键词： accretion and accretion disks neutron stars black holes jets and bursts X-ray sources γ-ray sources X-ray binaries