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Molecular Dynamics Simulation of the Evolution of Interfacial Dislocation Network and Stress Distribution of a Ni-Based SingleCrystal Superalloy

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Acta Metallurgica Sinica(English Letters) 2016年第7期29卷 689-696页

作者： yun-Li Li Wen-Ping Wu Zhi-gang Ruan Key Laboratory of Geotechnical and Structural Engineering Safety of Hubei Province School of Civil EngineeringWuhan University State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan University

The evolution of misfit dislocation network at γ/γ＇ phase interfaces and the stress distribution characteristics of Ni-based single-crystal superalloys under different temperatures of 0, 100 and 300 K are studied by molecular dynamics （MD） simulation. It was found that a closed three-dimensional misfit dislocation network appears on the γ/γ＇ phase interfaces, and the shape of the dislocation network is independent of the lattice mismatch. Under the influence of the temperature, the dislocation network gradually becomes irregular, a/2 [110] dislocations in the γ matrix phase emit and partly cut into the γ＇ phase with the increase in temperature. The dislocation evolution is related to the local stress field, a peak stress occurs at γ/γ＇ phase interface, and with the increase in temperature and relaxation times, the stress in the γ phase gradually increases, the number of dislocations in the γ phase increases and cuts into γ＇ phase from the interfaces where dislocation network is damaged. The results provide important information for understanding the temperature dependence of the dislocation evolution and mechanical properties of Ni-based single-crystal superalloys.

关键词： Ni-based single-crystal superalloy Molecular dynamics simulation Dislocation network Stress distribution

Crosslinked carboxymethyl cellulose-sodium borate hybrid binder for advanced silicon anodes in lithium-ion batteries

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Chinese Chemical Letters 2018年第12期29卷 1773-1776页

作者： Li Zhang yun ding Jiangxuan Song State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University College of Mechanical and Electrical Engineering Beijing University of Chemical Technology

Silicon anodes have drawn ever-increasing attention in lithium-ion batteries(LIBs) owing to their extremely high theoretical capacity and abundance in the earth. Despite promising advantages, the wide use of silicon anodes in LIBs is highly hindered by their fast capacity fading and low Coulombic efficiency arising from their substantial volumetric variation(>300%). Herein, we report a novel aqueous hybrid gel binder for silicon anodes via crosslinking sodium carboxymethyl cellulose(NaCMC) by an inorganic crosslinker-sodium borate. Not only this gel polymer binder can chemically bond to silicon nanoparticle, but also the deformable framework of this crosslinked binder is capable of maintaining electrode integrity, thus buffering dramatic volume change of silicon. Consequently, the silicon anode with this gel binder exhibits good cycle life(1211.5 mAh/g after 600 cycles) and high initial Coulombic efficiency(88.95%).

关键词： Lithium-ion batteries Silicon anodes Sodium carboxymethyl cellulose Binder Crosslinking

Performance evaluation of a micro turbo-expander for application in low-temperature solar electricity generation

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2011年第3期12卷 207-213页

作者： gang PEI yun-zhu LI Jing LI Jie JI Department of Thermal Science and Energy Engineering University of Science and Technology of China Hefei 230026 China

A micro turbo-expander capable of high working speed was specially manufactured for use in an organic Rankine cycle (ORC).A series of tests were executed to examine the performance of the *** the experiment,the machine was tested under different inlet pressure conditions (0.2-0.5 MPa).Data such as the compressed air pressure,temperatures of the inlet and the outlet,rotational speed,and electric power generation were analyzed to discover underlying *** the test,the rotational speed of the machine reached as high as 54 000 r/min,the peak value of the temperature drop between the inlet and the outlet reached 42 ℃,the maximum electric power generated by the motor-generator attached to the machine reached 630 W,and the efficiency of the machine reached 0.43.

关键词： Turbo-expander Solar Low-temperature Performance evaluation

Submonolayer biolasers for ultrasensitive biomarker detection

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Light(Science & Applications) 2023年第12期12卷 2768-2777页

作者： Chaoyang Gong Xi Yang Shui-Jing Tang Qian-Qian Zhang Yanqiong Wang Yi-Ling Liu Yu-Cheng Chen gang-ding Peng Xudong Fan yun-Feng Xiao yun-Jiang Rao Yuan Gong Key Laboratory of Optical Fiber Sensing and Communications(Ministry of Education of China) School of Information and Communication EngineeringUniversity of Electronic Science and Technology of ChinaChengduSichuan 611731China Key Laboratory of Optoelectronic Technology and Systems(Ministry of Education of China) School of Optoelectronic EngineeringChongqing UniversityChongqing 400044China State Key Laboratory for Mesoscopic Physics and Frontiers Science Centre for Nano-optoelectronics School of PhysicsPeking UniversityBeijing 100871China School of Electrical and Electronic Engineering Nanyang Technological UniversitySingapore 639798Singapore School of Electrical Engineering and Telecommunications University of New South WalesSydneyNSW 2052Australia Department of Biomedical Engineering University of MichiganAnn ArborMI 48109USA Research Centre for Optical Fiber Sensing Zhejiang LaboratoryHangzhouZhejiang 310000China

Biomarker detection is key to identifying health ***,designing sensitive and single-use biosensors for early diagnosis remains a major ***,we report submonolayer lasers on optical fibers as ultrasensitive and disposable *** optical fibers serve as distributed optical microcavities with high Q-factor,great repeatability,and ultralow cost,which enables whispering-gallery laser emission to detect *** is found that the sensing performance strongly depends on the number of gain *** submonolayer lasers obtained a six-order-of-magnitude improvement in the lower limit of detection(LOD)when compared to saturated monolayer *** further achieve an ultrasensitive immunoassay for a Parkinson's disease biomarker,alpha-synuclein(α-syn),with a lower LOD of 0.32 pM in serum,which is three orders of magnitude lower than theα-syn concentration in the serum of Parkinson's disease *** demonstration of submonolayer biolaser offers great potentials in high-throughput clinical diagnosis with ultimate sensitivity.

关键词： lasers monolayer diagnosis

Ductility of metal thin films in flexible electronics

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Science China(Technological Sciences) 2008年第11期51卷 1971-1979页

作者： NIU RongMei LIU gang ding XiangDong SUN Jun State Key Laboratory for Mechanical Behavior of Materials and School of Materials Science&Engineering Xi’an Jiaotong UniversityXi’an 710049China

Flexible, large area electronics using various organic and inorganic materials are beginning to show great promise. During manufacture and service, large deforma- tion of these hybrid materials will pose significant challenges in terms of high performance and reliability. A deep understanding of the ductility or flexibility of macroelectronics becomes one of the major issues that must be addressed ur- gently. This paper describes the current level of understanding on the thin-film ductility, both free-standing and substrate-supported, and relevant influencing factors.

关键词： thin films deformation flexible electronics

Hollow MOF capsule encapsulated amino-functionalized ionic liquid for excellent CO_(2) catalytic conversion

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Chinese Journal of Chemical Engineering 2021年第12期34卷 124-130页

作者： Bo-yun Liu Min-Jie Chen Liang Yang Bo Zhao Tao Xia gang-gang Chang School of Power Engineering Naval University of EngineeringWuhan 430033China School of Chemistry Chemical Engineering and Life ScienceWuhan University of TechnologyWuhan 430070China

The engineering of highly efficient and stable heterogeneous catalysts for catalytic conversion of CO_(2) to high value-added products is highly desirable but presents a great challenge. Herein, we reported the synthesis of a series of multifunctional IL@H-Zn/Co-ZIF composite catalysts with a unique porous hollow capsule structure and encapsulated amino-functionalized ionic liquids(ILs). The unique hollow capsule structure of IL@H-Zn/Co-ZIF provides sufficient space for loading active ILs([C_(2)NH_(2) Mim+][Brà]) and fast mass transfer of substrate molecules during catalysis. Furthermore, the microporous Zn-ZIF shell can effectively avoid the leaching of active ILs. Benefiting from the unique hollow structure, the resultant IL@H-Zn/Co-ZIF demonstrated excellent catalytic performance(>95% yield), and good recyclability(still remained about 90% activities after 5 cycles) when applied in the CO_(2) cycloaddition reaction under solvent and co-catalyst free conditions.

关键词： MOFs Catalyst Hollow capsule CO_(2)capture Ionic liquids

Coupled elasto-plasticity damage constitutive models for concrete

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2013年第4期14卷 256-267页

作者： Qiang XU Jian-yun CHEN Jing LI gang XU State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology School of Civil and Hydraulic Engineering Dalian University of Technology Plan and Design Institute of Daqing Oilfield Communication Company

The paper is to design and construct a coupled elasto-plasticity damage constitutive model for *** on the energy dissipation principle,the Hsieh-Ting-Chen four-parameter yield function is *** model can reflect different strength characteristics of concrete in tension and compression,and reduce the limitation and lacuna of the traditional damage constitutive models for ***,numerical test for concrete stress-strain relation under uniaxial tension and compression is ***,the damage process of concrete gravity dam is calculated and analyzed in seismic *** with other damage constitutive models,the proposed model contains only one unknown parameter and the other parameters can be found in the Hsieh-Ting-Chen four-parameter yield *** same damage evolution law,which is used for tension and compression,is good for determining stress-strain constitutive and damage characteristics in complex stress *** coupled damage constitutive models can be applied in analyzing damage of concrete gravity dam and arch dam.

关键词： Concrete Damage constitutive models Hsieh-Ting-Chen four-parameter yield function Uniaxial tension Uniaxial compression Gravity dam Arch dam

Investigation of maximum proton energy for qualified ground based evaluation of single-event effects in SRAM devices

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Nuclear Science and Techniques 2019年第3期30卷 97-104页

作者： Zhan-gang Zhang yun Huang yun-Fei En Zhi-Feng Lei Science and Technology on Reliability Physics and Application of Electronic Component Laboratory China Electronic Product Reliability and Environmental Testing Research Institute

Existing standards show a clear discrepancy in the specification of the maximum proton energy for qualified ground-based evaluation of single-event effects,which can range from 180 to 500 MeV. This work finds that the threshold linear energy transfer of a tested device is a critical parameter for determining the maximum proton energy. The inner mechanisms are further revealed. Highenergy deposition events(>10 MeV) in sensitive volumes are attributed to the interaction between protons and the tungsten vias in the metallization layers.

关键词： Proton Single-event effect Threshold LET Monte Carlo simulation

Description of the Rigid Triaxial Deformation at Low Energy in 76Ge with the Proton-Neutron Interacting Model IBM2

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Chinese Physics Letters 2013年第12期30卷 21-24页

作者： ZHANG Da-Li ding Bin-gang Department of Physics Huzhou Teacher's CollegeHuzhou 313000

We investigate properties of the low-lying energy states for 76Ge within the framework of the proton-neutron interacting model IBM2,considering the validity of the Z=38 subshell closure 88Sr50 as a doubly magic *** introducing the quadrupole interactions among like bosons to the IBM2 Hamiltonian,the energy levels for both the ground state andγbands are reproduced ***,the doublet structure of theγband and the energy staggering signature fit the experimental data *** ratios of B(E2)transition strengths for some states of theγband,and the g factors of the 2^(+)_(1),2^(+)_(2) states are very close to the experimental *** calculation result indicates that the nucleus exhibiting rigid triaxial deformation in the low-lying states can be described rather well by the IBM2.

关键词： IBM2 states closure