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Enhanced Ion-Selective Diffusion Achieved by Supramolecular Interaction for High Thermovoltage and Thermal Stability

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Energy & Environmental Materials 2024年第2期7卷 200-208页

作者： Jiale ke Xing Zhao Jie yang kai ke Yu Wang Mingbo yang Wei yang College of Polymer Science and Engineering Sichuan UniversityState Key Laboratory of Polymer Materials EngineeringChengdu 610065China

Thermoelectric(TE)generators capable of converting thermal energy into applicable electricity have gained great popularity among emerging energy conversion ***-based ionic thermoelectric(i-TE)materials are promising candidates for energy conversion systems because of their wide sources,innocuity,and low manufacturing ***,common physically crosslinked biopolymer gels induced by single hydrogen bonding or hydrophobic interaction suffer from low differential thermal voltage and poor thermodynamic ***,we develop a novel i-TE gel with supramolecular structures through multiple noncovalent interactions between ionic liquids(ILs)and gelatin molecular *** thermopower and thermoelectric power factor of the ionic gels are as high as 2.83 mV K-1 and 18.33μW m^(-1)K^(-2),*** quasi-solid-state gelatin-[EMIM]DCA i-TE cells achieve ultrahigh 2 h output energy density(E_(2h)=9.9 mJ m^(-2))under an optimal temperature ***,the remarkable stability of the supramolecular structure provides the i-TE hydrogels with a thermal stability of up to 80℃.It breaks the limitation that biopolymer-based i-TE gels can only be applied in the low temperature range and enables biopolymer-based i-TE materials to pursue better performance in a higher temperature range.

关键词： biopolymer gel ionic liquid multiple noncovalent interactions supramolecular structure thermoelectric conversion

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高铁路基振动压实机-土耦合系统动力学分析

Effect of Aging on Microstructure and Mechanical Property of 1900 MPa Grade Maraging Stainless Steel

工程力学 2025年第1期42卷 241-248页

作者：叶阳升尧俊凯蔡德钩魏文彬王柯中国铁道科学研究院铁道建筑研究所北京100081 哈尔滨工业大学土木工程学院哈尔滨150090

压路机连续压实系统根据振动压实过程中振动轮响应评价压实质量，并根据土体压实质量反馈调节压路机工作参数。基于集中参数模型引入塑性弹簧，将压实过程分为弹性、弹塑性、分离三阶段;分别建立三阶段动力学控制方程，依据轮-土相对位... 详细信息

压路机连续压实系统根据振动压实过程中振动轮响应评价压实质量，并根据土体压实质量反馈调节压路机工作参数。基于集中参数模型引入塑性弹簧，将压实过程分为弹性、弹塑性、分离三阶段;分别建立三阶段动力学控制方程，依据轮-土相对位移与作用力确定各阶段切换条件;采用现场实测数据验证模型可靠性;揭示激振力特性(激振力幅值、激振频率)和土体参数的振动响应规律。结果表明：激振力幅值不变时，振动轮振幅和分离周期随激振频率的增大而减小。激振频率不变时，振动轮振幅和分离周期随着激振频率的增大而增大。当激振力幅值与激振频率不变，振动轮振幅随着土体动剪切模量的提升而降低，土体动剪切模量较小时，土体以塑性变形为主。土体动剪切模量较大时，土体以弹性变形为主，振幅缓慢下降，直至趋于平缓。

关键词：高铁路基路基压实振动压实机土耦合动力学系统

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Journal of Materials Science & Technology 2007年第3期23卷 312-318页

作者： kai LIU Yiyin SHAN Zhiyong yang Jianxiong LIANG Lun LU ke yang Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China Graduate School of Chinese Academy of Sciences Beijing 100039 China General Research Institute for Iron and Steel Beijing 100081 China Technical Center Dongbei Special Steel Group Co. Fushun 113001 China

The 18%Ni alloy steels provide high strength and toughness, while age-hardenable or PH stainless steels also have good corrosion resistance. This paper focuses on an investigation of the heat treatment, mechanical properties and microstructural development of a new maraging stainless steel. It is reported that the heat treatment process should consist of solution treatment and cryogenic cooling to attain a fully martensitic structure, followed by aging at 813 K. This heat treatment resulted in an ultimate tensile strength of over 1900 MPa combined with good impact toughness. Transmission electron microscopy is used to show that, for the peak-aged condition （813 K/4 h）, nano-sized precipitates, e.g. Ni3Mo and/or R-phase, and a high density of dislocations were uniformly dispersed in the lath martensite matrix. The calculated yield strength, based on a revised Orowan mechanism, is in good agreement with the test data. The steel studied has an ultimate tensile strength over 1900 MPa, excellent fracture toughness, and good resistance against over-aging and relatively good corrosion resistance as well.

关键词： Maraging stainless steels Precipitation High strength steels Aging treatment

Effect of Heat Treatment on Prior Grain Size and Mechanical Property of a Maraging Stainless Steel

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Journal of Materials Science & Technology 2006年第6期22卷 769-774页

Effect of the heat treatment, including solution treatment （ST） and aging treatment （AT）, on the prior austenite grain （PAG） size, microstructure and mechanical properties of a precipitation hardening maraging stainless steel was investigated. The results indicate that the relations between PAG size and yield strength （σy） under both ST and AT conditions obey the HalI-Petch relationship. Furthermore, after ST at 1050℃ for 1 h＋cryogenic treated （CT） at -70℃ for 8 h＋AT at 535℃ for 4 h, the tested steel showed its ultimate tensile strength （σb） and σy over 1900 MPa and 1750 MPa, respectively.

关键词： Martensite Microstructure Precipitation hardening Heat treatment

Slice-wise reconstruction for low-dose cone-beam CT using a deep residual convolutional neural network

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Nuclear Science and Techniques 2019年第4期30卷 53-61页

作者： Hong-kai yang kai-Chao Liang ke-Jun Kang Yu-Xiang Xing Department of Engineering Physics Tsinghua University key Laboratory of Particle and Radiation Imaging Ministry of Education Tsinghua University

Because of the growing concern over the radiation dose delivered to patients, X-ray cone-beam CT(CBCT) imaging of low dose is of great interest. It is difficult for traditional reconstruction methods such as Feldkamp to reduce noise and keep resolution at low doses. A typical method to solve this problem is using optimizationbased methods with careful modeling of physics and additional constraints. However, it is computationally expensive and very time-consuming to reach an optimal solution. Recently, some pioneering work applying deep neural networks had some success in characterizing and removing artifacts from a low-dose data set. In this study,we incorporate imaging physics for a cone-beam CT into a residual convolutional neural network and propose a new end-to-end deep learning-based method for slice-wise reconstruction. By transferring 3D projection to a 2D problem with a noise reduction property, we can not only obtain reconstructions of high image quality, but also lower the computational complexity. The proposed network is composed of three serially connected sub-networks: a cone-to-fan transformation sub-network, a 2D analytical inversion sub-network, and an image refinement sub-network. This provides a comprehensive solution for end-to-end reconstruction for CBCT. The advantages of our method are that the network can simplify a 3D reconstruction problem to a 2D slice-wise reconstruction problem and can complete reconstruction in an end-to-end manner with the system matrix integrated into the network design. Furthermore, reconstruction can be less computationally expensive and easily parallelizable compared with iterative reconstruction methods.

关键词： Cone-beam CT Slice-wise Residual U-net Low dose Image denoising

In vitro insights into the role of copper ions released from selective laser melted CoCrW-xCu alloys in the potential attenuation of inflammation and osteoclastogenesis

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Journal of Materials Science & Technology 2020年第6期41卷 56-67页

作者： Yanjin Lu Xiongcheng Xu Chunguang yang Ling Ren kai Luo ke yang Jinxin Lin key Laboratory of Optoelectronic Materials Chemistry and Physics Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350001China University of Chinese Academy of Sciences Beijing 100049China key Laboratory of Stomatology Fujian Medical UniversityFuzhou 350001China Institute of Metal Research Chinese Academy of SciencesShenyang 110016China

In this study,the CoCrW-x Cu alloys(x=2,3 and 4 wt%)were fabricated using selective laser melting(abbreviated as Co-2 Cu,Co-3 Cu and Co-4Cu)with the purpose of reducing the inflammation responses and the activity of *** metal ions releasing test showed that when the Cu content was less than 4 wt%,the releasing amount of Co and Cr ions was very small;however,when 4 wt%Cu was added in the CoCrW based alloy,the quantity of Co ions was significantly elevated with respect to the other groups due to the segregation of precipitates in the matrix;the Cu2+ion quantity of the Co-2Cu,Co-3Cu and Co-4Cu alloys were 0.05,0.09 and 0.27 g/(L cm2)after 7 d immersion,respectively;the RT-q PCR and ELISA data indicated that the expression levels of the pro-inflammatory cytokines(TNF-αand IL-6)were down-regulated in the Co-3Cu and Co-4Cu groups,whereas the expression level of the anti-inflammatory cytokine(IL-10)was up-regulated in all CoCrW-x Cu alloys;meanwhile,the Cu-containing CoCrW alloys significantly down-regulated the expression of the NF-B signal pathway in a Cu content-dependent manner,and the downstream transcription factors of NF-B signal pathway including NFATc1,TRAP and Cath-K were also down-regulated via potentially manipulating the NF-B signal *** comprehensive consideration,it is considered that the Co-3Cu alloy is a potential material for self-alleviating inflammatory responses.

关键词： Osteoclast Selective laser melting Macrophage Cu-bearing biomedical alloy Biocompatibility

Probabilistic graphical models in energy systems:A review

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Building Simulation 2022年第5期15卷 699-728页

作者： Tingting Li yang Zhao ke Yan kai Zhou Chaobo Zhang Xuejun Zhang Institute of Refrigeration and Cryogenics Zhejiang UniversityHangzhouChina Department of Building School of Design and EnvironmentNational University of Singapore4 Architecture DriveSingapore Zhejiang Energy Gas Group Co. LtdHangzhouChina

Probabilistic graphical models(PGMs)can effectively deal with the problems of energy consumption and occupancy prediction,fault detection and diagnosis,reliability analysis,and optimization in energy *** with the black-box models,PGMs show advantages in model interpretability,scalability and *** have great potential to realize the true artificial intelligence in energy systems of the next *** paper intends to provide a comprehensive review of the PGM-based approaches published in the last *** reveals the advantages,limitations and potential future research directions of the PGM-based approaches for energy *** types of PGMs are summarized in this review,including static models(SPGMs)and dynamic models(DPGMs).SPGMs can conduct probabilistic inference based on incomplete,uncertain or even conflicting ***-based approaches are proposed to deal with various management tasks in energy *** show outstanding performance in fault detection and diagnosis of energy *** can represent a dynamic and stochastic process by describing how its state changes with ***-based approaches have high accuracy in predicting the energy consumption,occupancy and failures of energy *** the future,a unified framework is suggested to fuse the knowledge-driven and data-driven PGMs for achieving better *** PGM-based approaches are needed that can be adapted to various energy *** algorithms would outperform the basic PGMs by integrating advanced techniques such as deep learning and first-order logic.

关键词： probabilistic graphical model energy system Bayesian network-dynamic Bayesian network Markov chain hidden Markov model

Cerium and ruthenium co-doped La_(0.7)Sr_(0.3)FeO_(3-δ) as a high-efficiency electrode for symmetrical solid oxide fuel cell

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Journal of Rare Earths 2021年第9期39卷 1095-1099页

作者： Junkai Wang Lei Fu Jiaming yang ke Wu Jun Zhou kai Wu Center of Nanomaterials for Renewable Energy State Key Laboratory of Electrical Insulation and Power EquipmentXi'an Jiaotong UniversityXi'an710049China

Symmetrical solid oxide fuel cells(SSOFCs)could be alternative energy conversion devices due to their simple fabrication process and low ***,perovskite La_(0.6)Ce_(0.1)Sr_(0.3)Fe_(0.95)Ru_(0.05O3-δ)(LCSFR)was synthesized and evaluated as a high-performance electrode for SSOFCs based on the electrolyte of La_(0.9)Sr_(0.1)Ga_(0.8)Mg_(0.2)O_(3-δ)(LSGM).LCSFR retains their stable perovskite crystal structure in both reducing and oxidizing atmospheres,though a minor amount of LaSrFeO4 phase is present under reducing *** investigation shows that homogeneously dispersed Ru metallic nanoparticles are exsolved on the surface of LCSFR after being *** polarization resistance(Rp)of LCSFR-CGO(Ce_(0.9)Gd_(0.1O2-δ))is about 0.11Ω·cm^(2)at 800℃in air,while the value of Rp for LCSFR-CGO in wet H_(2)(3%H_(2)O)increases up to 0.32Ω·cm^(2).The symmetrical LCSFR-CGOILSGMILCSFR-CGO cell demonstrates a performance with an open circuit potential(OCV)of 1.07 V and a maximum peak power density of 904 mW/cm^(2)at 800℃using wet H2 as the *** high performance indicates that LCSFR is a candidate electrode for SSOFCs.

关键词： Symmetrical electrode SSOFCs Exsolution Nanoparticle catalysts Rare earths

Polymer matrix mediated solvation of LiNO3 in carbonate electrolytes for quasi-solid high-voltage lithium metal batteries

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Nano Research 2020年第9期13卷 2431-2437页

作者： Zijian Wang kai yang Yongli Song Hai Lin ke Li Yanhui Cui Luyi yang Feng Pan School of Advanced Materials Peking University Shenzhen Graduate School Shenzhen 518055China

Lithium(Li)metal is one of the most promising anodes for next-generation energy storage ***,the Li dendrite formation and unstable solid-electrolyte interface(SEI)have hindered its further *** nitrate(LiNO3)is extensively used as an effective electrolyte additive in ether-based electrolytes to improve the stability of lithium ***,it is rarely utilized in carbonate electrolytes due to its low ***,a novel gel polymer electrolyte(GPE)consisting of poly(vinylidene fluoride)(PVDF),poly(methyl methacrylate)(PMMA),poly(ethylene oxide)(PEO)with LiN03 additive is proposed to solve this *** this GPE,polyether-based PEO serves as a matrix for dissolving LiNO3 which can be decomposed into a fast Li-ion conductor(Li3N)in conventional carbonate electrolytes to enhance the stability and Li^+conductivity of the SEI *** a result,dendrite formation is effectively suppressed,and a significantly improved average Coulombic efficiency(CE)of 97.2%in Li-Cu cell is *** using this novel GPE coupled with Li anode and LiNi0.5Mn0.3Co0.2O2(NMC532),excellent capacity retention of 94.1%and high average CE of over 99.2%are obtained after 200 cycles at 0.5 *** work presents fresh insight into practical modification strategies on high-voltage Li metal batteries.

关键词： Li anode gel polymer electrolyte lithium nitrate Li dendrite electrolyte additives