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Mechanical and electronic properties of diamondlike BC_5

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2011年第3期12卷 177-182页

作者： qing ZHANG Shi-ming WANG Yong-cheng liang Xinzhou Teachers University Xinzhou 034000 Shanxi China College of Engineering Science and Technology Shanghai Ocean University Shanghai 201306 China State Key Laboratory of High Performance Ceramics and Superfine Microstructures Shanghai Institute of Ceramics Chinese Academy of Sciences Shanghai 200050 China

The structural properties,mechanical behavior,and electronic structure of the newly developed diamondlike BC5 (d-BC5) was investigated using density functional theory (DFT) *** results indicate that d-BC5 has great bulk modulus of 393 GPa,large shear modulus of 398 GPa,and high hardness of 62 Pa,and thus support the fact that d-BC5 is an ultra-incompressible and superhard ***,the superhard d-BC5 exhibits metallic ***,the trend that the mechanical behavior falls with the increase of boron content was *** combination of huge stiffness,high hardness,and good metallicity makes series of diamondlike BCx (d-BCx) valid for wider applications in comparison with pure diamond.

关键词： Mechanical properties Metallicity Diamondlike BC5

Effect of thermal oxidation on microstructures and mechanical properties of nanoporous coppers

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Science China(Technological Sciences) 2018年第12期61卷 1839-1844页

作者： ZHOU Wen YANG qing SUN ShaoDong liang ShuHua Faculty of Materials Science and Engineering Xi'an University of Technology Shaanxi Province Key Laboratory for Electrical Materials and Infiltration Technology Xi'an University of Technology

Nanoporous copper oxides were formed by thermal oxidation of nanoporous copper at 150°C–270°C. The oxidation process of nanoporous copper was investigated by using XRD, SEM, nitrogen adsorption, HRTEM and nanoindentation. The variation of microstructures and mechanical properties was analyzed. The results showed that the content of copper oxides increased, the ligament gradually coarsened, and the mechanical properties of nanoporous structure were improved with the increase of oxidation temperature. When the oxidation temperature was below 210°C, the ligament surface was oxidized to Cu_2O, and the composite structure of Cu_2O@Cu was formed. The formation of CuO occurred since 220°C, and the composite structure of CuO/Cu_2 O@Cu was formed. CuO nanowires were grown on the ligament surface at 250°C; the specific surface area, elastic modulus and hardness of nanoporous structure are 1.37, 3.31 and 7.58 times that of the nanoporous copper, respectively.

关键词： nanoporous copper thermal oxidation microstructure mechanical property

Interfacial microstructure of Cu Cr/1Cr18Ni9Ti bi-metal materials and its effect on bonding strength

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Science China(Technological Sciences) 2015年第5期58卷 825-831页

作者： ZHANG Qiao liang ShuHua ZOU JunTao YANG qing Shaanxi Province Key Laboratory of Electrical Materials and Infiltration Technology Xi'an University of Technology

The Cu Cr/1Cr18Ni9 Ti bi-metal materials were prepared by the solid-liquid bonding method. The microstructures, mechanical properties and formation mechanism of the bonding interface were studied. The results show that there exists a serrated transition layer with a certain width at the interface of Cu Cr/1Cr18Ni9 Ti bi-metal materials, and the transition layer consists of Fe-based and Cu-based solid solutions. The elastic modulus and hardness reach the maximum values at the interface closing to the 1Cr18Ni9 Ti zone. The bonding temperature has a significant effect on the width and morphology of the transition layer. The interfacial bonding strength is at least 30% higher than that of the Cu Cr alloy, and the tensile fracture occurs at the side of the Cu Cr alloy rather than at the bonding interface.

关键词： bonding modulus tensile interfacial SAED hardness closing polymerization Figure bonded

Facile synthesis of PdCu nanocluster-assembled granular films as highly efficient electrocatalysts for formic acid oxidation

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Rare Metals 2022年第8期41卷 2595-2605页

作者： qing-Wei Ding qing Luo liang Lin Xing-Ping Fu Lai-Sen Wang Guang-Hui Yue Jie Lin qing-Shui Xie Dong-liang Peng College of Materials Xiamen UniversityXiamen361005China Fujian Provincial Key Laboratory of Eco-Inductrial Green Technology Wuyi UniversityWuyishan354300China

Developing efficient and stable bimetallic Pdbased anode electrocatalysts toward formic acid oxidation(FAO)is of great significance for commercial applications of direct formic acid fuel cells(DFAFCs).Herein,we report a facile synthesis approach to fabricate PdCu nanoclusters(NCs)catalysts with granular-film *** introduction of Cu can adjust the electronic structure and d-band center of Pd,which can improve the catalytic performance of the *** with Pd NCs catalyst,the catalytic durability and activity of PdCu NCs catalysts for FAO are greatly *** order for catalytic activity of NC metals is Pd_(85)Cu_(15)NCs>Pd_(70)Cu_(30)NCs>Pd *** maximum mass activity can be acquired with the Pd_(85)Cu_(15)NCs catalyst,which is about1.7 times that of the Pd NCs *** Pd_(85)Cu_(15)NCs catalyst still maintains the highest catalytic current density after 50 cycles,indicating that Pd_(85)Cu_(15)NCs catalyst has the best durability and electrocatalytic activity for *** work provides a new prospect for the design of highly efficient anode catalysts materials for DFAFCs.

关键词： Plasma gas-condensation method Formic acid electrooxidation Direct formic acid fuel cells(DFAFCs) PdCu nanoclusters catalyst

Real Heat Flux Analysis of Continuously Casting Round Billet

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Journal of Iron and Steel Research International 2008年第1期15卷 25-29页

作者： ZHAN Hui-ying WANG Xu-dong GUO liang-liang YAO man School of Material Science and Engineering Dalian University of Technology Dalian 116024 Liaoning China

The distributions of heat flux along the height and the circumferential direction of round billet mould were measured *** influence of casting speed,carbon content,powder,and pouring temperature on the average longitudinal and circumferential heat flux in the ＂high heat flux region＂ was *** experimental and analytical results provide a basis for an intelligent mould with online detection of defects,adjustment of operational parameters,optimization of the monitoring system,and even prediction of abnormal heat transfer.

关键词： continuous casting mould heat flux round billet

Isogeometric Analysis for the Arbitrary AFG Microbeam with Two-Phase Nonlocal Stress-Driven Model

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Acta Mechanica Solida Sinica 2024年第2期37卷 341-360页

作者： Pei-liang Bian Zhaowei Liu Hai qing Tiantang Yu Department of Engineering Mechanics Hohai UniversityNanjing211100China State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and AstronauticsNanjing210016China

Scale effects play critical roles in the mechanical responses of *** isogeometric analysis was developed here to investigate the mechanical responses of an axially functionally graded *** Euler–Bernoulli beam model was utilized,and size effects in the structure were modeled with a stress-driven two-phase local/nonlocal integral *** governing equation of microstructures was given in an equivalent differential form with two additional constitutive boundary *** framework was verified and utilized to analyze the microbeam’s static and dynamic mechanical *** present work showed great potential for modeling various types of functionally graded microstructures.

关键词： Isogeometric analysis Size effect Functionally graded material Nonlocal theory Euler-Bernoulli beam

PSA study of the effect of extreme snowfall on a floating nuclear power plant:case study in the Bohai Sea

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Nuclear Science and Techniques 2023年第11期34卷 212-225页

作者： Lan‑Xin Gong qing‑Zhu liang Chang‑Hong Peng School of Nuclear Science and Technology University of Science and Technology of ChinaHefei 230026China

This study presents a probabilistic safety analysis(PSA)method for the external event of extreme snowfall on a floating nuclear power plant(FNPP)deployed in the Bohai *** utilized the Weibull and Gumbel extreme value distributions to fit the collected meteorological data and obtained a hazard curve for the event of an extreme snowfall where the FNPP is located,providing a basis for the frequency of extreme snowfall-initiating *** analysis indicates that extreme snowfall primarily affects the ventilation openings of the equipment,leading to the failure of devices such as the diesel ***,extreme snowfall can result in a loss of off-site power(LOOP).Therefore,the developed extreme snowfall PSA model is mainly based on the LOOP event tree,considering responses such as snowfall removal by *** calculations indicate a core damage frequency(CDF)of 1.13×10^(-10) owing to extreme snowfall,which is relatively *** results of the cut-set analysis indicate that valve failures in the core makeup tank(CMT),passive residual heat removal system(PRS),and in-containment refueling water storage tank(IRWST)significantly contribute to the CDF.

关键词： Floating nuclear power plant(FNPP) ACP100 Extreme snow PSA External hazard

Chiral effective Lagrangian for excited heavy-light mesons from QCD

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Communications in Theoretical Physics 2021年第6期73卷 94-101页

作者： qing-Sen Chen Hui-Feng Fu Yong-liang Ma qing Wang Center for Theoretical Physics College of PhysicsJilin UniversityChangchun 130012China School of Fundamental Physics and Mathematical Sciences Hangzhou Institute for Advanced StudyUCASHangzhou310024China International Center for Theoretical Physics Asia-Pacific(ICTP-AP)(Beijing/Hangzhou) UCASBeijing 100190China Department of Physics Tsinghua UniversityBeijing 100084China Center for High Energy Physics Tsinghua UniversityBeijing 100084China

We derive the chiral effective Lagrangian for excited heavy-light mesons from QCD under proper *** focus on the chiral partners with j_(l)^(P)=3+/2 and j_(l)^(P)=3-/2 which amounts to(1^(+),2^(+))and(1^(-),2^(-))states *** low energy constants including the masses of the chiral partners are *** calculated spectrum for the excited mesons are found roughly consistent with experimental *** addition,our results indicate that quantum numbers of B_(J)(5970)can be identified with 1^(-)or 2^(-).

关键词： chiral effective Lagrangian heavy-light meson QCD chiral partner

Longitudinal Magnetoresistance Effect at Low Temperature in Silver Telluride Thin Films

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Chinese Physics Letters 1999年第10期16卷 756-757页

作者： liang Bing-qing WANG Yin-jun State Key Laboratory for Magnetism Institute of Physics and Center for Condensed Matter PhysicsChinese Academy of SciencesBeijing 100080

Large longitudinal magnetoresistance(LMR)was observed in nonmagnetic silver telluride *** magnitude of the LMR is not simply dependent on T and H,for example,multi-peaks of p at low held and low temperature appear in the Ag-Te *** both of-△ρ/ρand a transition from-△ρ/ρto+△ρ/ρexist in Ag-Te Sims,the magnetoresistance(MR)behavior of the Ag-Te Sim does not like the bulk Ag-Te,but likes the doped ***-27%of LMR was observed at low Seld in the Ag-Te Sims,while it could be negligible in the doped *** MR behavior in Ag-Te Sims is discussed by means of a formation of impurity bands in the films.

关键词： resistance Silver silver