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Multi boron-doping effects in hard carbon toward enhanced sodium ion storage

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Journal of Energy Chemistry 2025年第1期100卷 730-738页

作者： peng Zheng Wang Zhou Ying Mo biao Zheng Miaomiao han Qin Zhong Wenwen Yang peng Gao Lezhi Yang Jilei Liu College of Materials Science and Engineering Hunan Joint International Laboratory of Advanced Materials and Technology for Clean Energy Hunan Province Key Laboratory for Advanced Carbon Materials and Applied Technology Hunan University Greater Bay Area Institute for Innovation Hunan University Changsha Research Institute of Mining & Metallurgy Co. LTD.

Hard carbon （HC） has been considered as promising anode material for sodium-ion batteries （SIBs）.The optimization of hard carbon’s microstructure and solid electrolyte interface （SEI） property are demonstrated effective in enhancing the Na+storage capability,however,a one-step regulation strategy to achieve simultaneous multi-scale structures optimization is highly ***,we have systematically investigated the effects of boron doping on hard carbon’s microstructure and interface chemistry.A variety of structure characterizations show that appropriate amount of boron doping can increase the size of closed pores via rearrangement of carbon layers with improved graphitization degree,which provides more Na+storage ***-situ Fourier transform infrared spectroscopy/electrochemical impedance spectroscopy （FTIR/EIS） and X-ray photoelectron spectroscopy （XPS） analysis demonstrate the presence of more BC3and less B–C–O structures that result in enhanced ion diffusion kinetics and the formation of inorganic rich and robust SEI,which leads to facilitated charge transfer and excellent rate *** a result,the hard carbon anode with optimized boron doping content exhibits enhanced rate and cycling *** general,this work unravels the critical role of boron doping in optimizing the pore structure,interface chemistry and diffusion kinetics of hard carbon,which enables rational design of sodium-ion battery anode with enhanced Na+storage performance.

关键词： X ray photoelectron spectroscopy

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TiAl合金高温锻造开坯过程数值模拟研究

材料工程 2009年第3期37卷 22-26,31页

作者：司家勇韩鹏彪高帆张继钢铁研究总院高温材料研究所北京100081 东北大学材料各向异性与织构工程教育部重点实验室沈阳110004

利用商业化有限元模拟软件Deform-3D对TiAl合金高温锻造开坯工艺过程进行了数值模拟,获得了两步锻造时不同变形量组合下变形饼坯中等效应变场和断裂因子分布信息。模拟结果表明,采用60%+62.5%的两步锻造方式,锻后饼坯中的应变均匀性提高... 详细信息

利用商业化有限元模拟软件Deform-3D对TiAl合金高温锻造开坯工艺过程进行了数值模拟,获得了两步锻造时不同变形量组合下变形饼坯中等效应变场和断裂因子分布信息。模拟结果表明,采用60%+62.5%的两步锻造方式,锻后饼坯中的应变均匀性提高,且断裂因子数值最小。实际锻造实验结果显示,通过这种两步锻造方式,确实能够有效扩大锭坯的均匀变形区,且动态再结晶组织细小、均匀。

关键词： TiAl合金高温锻造数值模拟

稀土Gd对Ti-46.5Al-2.5V-1.0Cr合金组织的影响

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钢铁研究学报 2009年第9期21卷 47-50页

作者：昌霞司家勇韩鹏彪张继钢铁研究总院高温材料研究所北京100081

通过光学金相和扫描电镜观察,分析了Ti-46.5Al-2.5V-1.0Cr(at.%)合金中添加微量稀土Gd对其铸态和变形组织的影响。结果表明,含Gd的TiAl合金其铸造组织晶粒更细小,变形宏观组织中均匀变形区较大,变形组织中动态再结晶的体积分数高,层片... 详细信息

通过光学金相和扫描电镜观察,分析了Ti-46.5Al-2.5V-1.0Cr(at.%)合金中添加微量稀土Gd对其铸态和变形组织的影响。结果表明,含Gd的TiAl合金其铸造组织晶粒更细小,变形宏观组织中均匀变形区较大,变形组织中动态再结晶的体积分数高,层片分解较完全。

关键词： TiAl合金稀土元素铸态组织变形组织

Ti-46.5Al-2.5V-1.0Cr-0.3Ni合金高温变形动态再结晶行为

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钢铁研究学报 2009年第5期21卷 46-50页

作者：司家勇韩鹏彪昌霞张继钢铁研究总院高温材料研究所北京100081

采用热模拟实验研究了变形参数(应变量、变形温度、应变速率)对Ti-46.5Al-2.5V-1.0Cr-0.3Ni合金微观变形组织的影响。研究结果表明,在应变量逐渐增加的热压缩变形过程中,一定变形量后开始出现层片弯曲、折曲或破碎,随着应变量的增加,动... 详细信息

采用热模拟实验研究了变形参数(应变量、变形温度、应变速率)对Ti-46.5Al-2.5V-1.0Cr-0.3Ni合金微观变形组织的影响。研究结果表明,在应变量逐渐增加的热压缩变形过程中,一定变形量后开始出现层片弯曲、折曲或破碎,随着应变量的增加,动态再结晶形成的等轴晶粒增多,残余层片团减少。变形温度对钛铝合金的变形组织有着显著影响,提高热变形温度,有利于合金中的动态再结晶以及变形组织的均匀化,降低残余层片团的体积分数。较低的应变速率能促进变形时的动态再结晶,有利于提高变形组织的均匀性。还对-γTiAl合金动态再结晶新晶粒形成过程进行了讨论。

关键词： TiAl合金高温变形变形组织

The detection, extraction and parameter estimation of extreme-mass-ratio inspirals with deep learning

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Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 86-96页

作者： Qianyun Yun Wen-biao han Yi-Yang Guo He Wang Minghui Du hangzhou Institute for Advanced Study University of Chinese Academy of Sciences Shanghai Astronomical Observatory Chinese Academy of Sciences School of Physics and Astronomy Shanghai Jiao Tong University School of Astronomy and Space Science University of Chinese Academy of Sciences Taiji Laboratory for Gravitational Wave Universe (Beijing/hangzhou) University of Chinese Academy of Sciences Lanzhou Center for Theoretical Physics Key Laboratory of Theoretical Physics of Gansu Province Key Laboratory of Quantum Theory and Applications of MoE Lanzhou University Institute of Theoretical Physics & Research Center of Gravitation Lanzhou University International Centre for Theoretical Physics Asia-Pacific (ICTP-AP) University of Chinese Academy of Sciences (UCAS) Center for Gravitational Wave Experiment National Microgravity Laboratory Institute of Mechanics Chinese Academy of Sciences

One of the primary goals of space-borne gravitational wave detectors is to detect and analyze extreme-mass-ratio inspirals(EMRIs). This task is particularly challenging because EMRI signals are complex, lengthy, and faint. In this work, we introduce a2-layer convolutional neural network(CNN) approach to detect EMRI signals for space-borne detectors, achieving a true positive rate(TPR) of 96.9% at a 1% false positive rate(FPR) for signal-to-noise ratio(SNR) from 50 to 100. Especially, the key intrinsic parameters of EMRIs such as the mass, spin of the supermassive black hole(SMBH) and the initial eccentricity of the orbit can also be inferred directly by employing a neural network. The mass and spin of the SMBH can be determined at 99% and 92% respectively. This will greatly reduce the parameter spaces and computing cost for the following Bayesian parameter *** model also has a low dependency on the accuracy of the waveform model. This study underscores the potential of deep learning methods in EMRI data analysis, enabling the rapid detection of EMRI signals and efficient parameter estimation.

关键词： gravitational wave EMRIs deep-learing

Ti-46.5Al-2.5V-1.0Cr-0.3Ni合金高温锻造本构模型研究

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锻压技术 2009年第5期34卷 121-125页

作者：司家勇韩鹏彪张继钢铁研究总院高温材料研究所北京100081 中南林业科技大学材料成形技术研究所湖南长沙410004

采用Gleeble-1500热模拟试验机对Ti-46.5Al-2.5V-1.0Cr-0.3Ni合金进行了温度1000-1200℃、应变速率0.001-1.0 s-1的等温热压缩实验,根据摩擦修正后的流变应力曲线,研究了工艺参数变化对流变应力的影响,建立了TiAl合金高温变形的本构模... 详细信息

采用Gleeble-1500热模拟试验机对Ti-46.5Al-2.5V-1.0Cr-0.3Ni合金进行了温度1000-1200℃、应变速率0.001-1.0 s-1的等温热压缩实验,根据摩擦修正后的流变应力曲线,研究了工艺参数变化对流变应力的影响,建立了TiAl合金高温变形的本构模型。结果表明：流变应力随变形温度升高而降低,随应变速率提高而增大,并且通过线性回归分析获得了1000-1200℃时的变形激活能为466 kJ·mol^-1和高温锻造本构方程。

关键词： TiAl合金热变形变形激活能本构模型

Mechanistic insight into the synergy between nickel single atoms and nanoparticles on N-doped carbon for electroreduction of CO2

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Journal of Energy Chemistry 2025年第1期100卷 327-336页

作者： Mingdong Sun Wenwen Guan Cailing Chen Chao Wu Xiaoling Liu biao Meng Tao Chen Yu han Jun Wang Shibo Xi Yu Zhou State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical Engineering Nanjing Tech University Advanced Membranes and Porous Materials Center Physical Sciences and Engineering Division King Abdullah University of Science and Technology Institute of Sustainability for Chemicals Energy and Environment A*STAR (Agency for Science Technology and Research) College of Materials Science and Engineering Sichuan University

The synergy of single atoms （SAs） and nanoparticles （NPs） has demonstrated great potential in promoting the electrocatalytic carbon dioxide reduction reaction （CO2RR）;however,the rationalization of the SAs/NPs proportion remains one challenge for the catalyst ***,a Ni2+-loaded porous poly（ionic liquids）(PIL) precursor synthesized through the free radical self-polymerization of the ionic liquid monomer,1-allyl-3-vinylimidazolium chloride,was pyrolyzed to prepare the Ni,N co-doped carbon materials,in which the proportion of Ni SAs and NPs could be facilely modulated by controlling the annealing *** catalyst Ni-NC-1000 with a moderate proportion of Ni SAs and NPs exhibited high efficiency in the electrocatalytic conversion of CO2into *** Ni K-edge X-ray absorption near-edge structure （XANES） spectra and theoretical calculations were conducted to gain insight into the synergy of Ni SAs and *** charge transfer from Ni NPs to the surrounding carbon layer and then to the Ni SAs resulted in the electron-enriched Ni SAs active *** the electroreduction of CO2,the coexistence of Ni SAs and NPs strengthened the CO2activation and the affinity towards the key intermediate of*COOH,lowering the free energy for the potential-determining*CO2→*COOH step,and therefore promoted the catalysis efficiency.

关键词： Single atom catalyst Synergy effect Carbon catalyst Electrocatalysis

热处理工艺对包套挤压镍微合金化TiAl合金组织与性能的影响

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材料工程 2005年第9期33卷 37-40页

作者：袁志山陈岁元韩鹏彪姜明智张继刘常升东北大学材料与冶金学院沈阳110004 钢铁研究总院高温材料研究所北京100081

以包套挤压镍微合金化TiAl合金为研究对象,研究了热处理工艺对合金组织和室温、800℃拉伸性能的影响。结果表明,70%变形量包套挤压合金经(α+γ)双相区1250℃热处理获得了再结晶完全的双态组织,其中不含有残留的层片结构;挤压合金经(α2... 详细信息

以包套挤压镍微合金化TiAl合金为研究对象,研究了热处理工艺对合金组织和室温、800℃拉伸性能的影响。结果表明,70%变形量包套挤压合金经(α+γ)双相区1250℃热处理获得了再结晶完全的双态组织,其中不含有残留的层片结构;挤压合金经(α2+γ)双相区退火处理后,合金室温拉伸屈服强度为535MPa,抗拉强度为650MPa,延伸率为3%;800℃拉伸屈服强度为365MPa,抗拉强度为400MPa,延伸率为156%,这种组织有利于进一步加工成形,使超塑成形成为可能。

关键词： TiAl合金包套挤压再结晶拉伸性能

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开式冷挤压成形深小锥孔尺寸预测的理论研究

塑性工程学报 2008年第4期15卷 105-107,125页

作者：韩鹏彪鲁素玲李军张双杰河北科技大学材料科学与工程学院石家庄050018

运用场论及流体动力学的理论,建立了深小锥孔开式冷挤压的非稳态速度场,运用上限法建立了变形功率和各主要参数间的函数关系。对开式冷挤压深小锥孔的尺寸进行了预测,得到了内孔母线曲线形式及坯料外锥度与内锥孔锥角的理论关系曲线。

关键词：深小锥孔开式冷挤压流函数非稳态速度场上限法