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

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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Analysis of in-plane 1:1:1 internal resonance of a double cable-stayed shallow arch model with cables’ external excitations

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Applied Mathematics and Mechanics(English Edition) 2019年第7期40卷 977-1000页

作者： Yunyue CONG Houjun KANG Tieding GUO College of Civil engineering Hunan University Changsha 410082 China key laboratory for damage diagnosis of engineering structures of hunan province Hunan University Changsha 410082 China

The nonlinear dynamic behaviors of a double cable-stayed shallow arch model are investigated under the one-to-one-to-one internal resonance among the lowest modes of cables and the shallow arch and external primary resonance of cables. The in-plane governing equations of the system are obtained when the harmonic excitation is applied to cables. The excitation mechanism due to the angle-variation of cable tension during motion is newly introduced. Galerkin’s method and the multi-scale method are used to obtain ordinary differential equations (ODEs) of the system and their modulation equations, respectively. Frequency- and force-response curves are used to explore dynamic behaviors of the system when harmonic excitations are symmetrically and asymmetrically applied to cables. More importantly, comparisons of frequency-response curves of the system obtained by two types of trial functions, namely, a common sine function and an exact piecewise function, of the shallow arch in Galerkin’s integration are conducted. The analysis shows that the two results have a slight difference;however, they both have sufficient accuracy to solve the proposed dynamic system.

关键词： nonlinear dynamics cable-stayed system internal resonance primary resonance multi-scale method

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High-precision tip positioning composite feedforward control of linear colocated motion systems with Bi-Loop iterative feedforward tuning

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Science China Technological Sciences 2025年

作者： Junyu HU Yourui TAO Shanhu LI Xu HAN College of Mechanical and Vehicle engineering Hunan University State key laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of Technology

To enhance the tip positioning accuracy and robustness against disturbances of linear colocated motion systems, a novel composite feedforward (COMFF) control with Bi-Loop iterative feedforward tuning (IFFT) is proposed. The tip positioning error consists of the coupled tip residual vibration and linear motor tracking error. Given the influence of nonlinear friction and load flexibility, the topology of COMFF is designed as decoupled structures so that COMFF can suppress the tip residual vibration and compensate for the linear motor tracking error compatibly. Furthermore, Bi-Loop IFFT is built to improve the robustness of COMFF in high-precision motor tracking performance. In the state space of the linear motor tracking error based on the projection theorem, two loops are performed in parallel along the iteration direction. One is the P-type iteration loop that drives linear motor tracking errors to converge to the zero state. The other is the observation loop constructed by the recursive least square with forgetting factors to accelerate the P-type iteration loop. Driven by the P-type iteration loop with the aid of the observation loop, the proposed COMFF is integrated with fast convergence and high robustness when confronted with model disturbances. The effectiveness of the proposed COMFF combined with Bi-Loop IFFT is validated by experiments.

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Triad mode resonant interactions in suspended cables

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Science China(Physics,Mechanics & Astronomy) 2016年第3期59卷 75-88页

作者： Tie Ding Guo Hou Jun Kang Lian Hua Wang Yue Yu Zhao College of Civil engineering Hunan University hunan Provincial key Lab on damage diagnosis for engineering structures Hunan University

A triad mode resonance, or three-wave resonance, is typical of dynamical systems with quadratic nonlinearities. Suspended cables are found to be rich in triad mode resonant dynamics. In this paper, modulation equations for cable's triad resonance are formulated by the multiple scale method. Dynamic conservative quantities, i.e., mode energy and Manley-Rowe relations, are then constructed. Equilibrium/dynamic solutions of the modulation equations are obtained, and full investigations into their stability and bifurcation characteristics are presented. Various bifurcation behaviors are detected in cable's triad resonant responses, such as saddle-node, Hopf, pitchfork and period-doubling bifurcations. Nonlinear behaviors, like jump and saturation phenomena, are also found in cable's responses. Based upon the bifurcation analysis, two interesting properties associated with activation of cable's triad resonance are also proposed, i.e., energy barrier and directional dependence. The first gives the critical amplitude of high-frequency mode to activate cable's triad resonance, and the second characterizes the degree of difficulty for activating cable's triad resonance in two opposite directions, i.e., with positive or negative internal detuning parameter.

关键词： suspended cables triad mode interaction multiple scale method

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Dynamical modeling and non-planar coupled behavior of inclined CFRP cables under simultaneous internal and external resonances

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Applied Mathematics and Mechanics(English Edition) 2019年第5期40卷 649-678页

作者： Houjun KANG Tieding GUO Weidong ZHU Junyi SU Bingyu ZHAO hunan Provincial key Lab on damage diagnosis for engineering structures Hunan University Department of Mechanical engineering University of Maryland College of Civil engineering Hunan University

A dynamic model for an inclined carbon ?ber reinforced polymer(CFRP)cable is established, and the linear and nonlinear dynamic behaviors are investigated in detail. The partial differential equations for both the in-plane and out-of-plane dynamics of the inclined CFRP cable are obtained by Hamilton's principle. The linear eigenvalues are explored theoretically. Then, the ordinary differential equations for analyzing the dynamic behaviors are obtained by the Galerkin integral and dimensionless *** steady-state solutions of the nonlinear equations are obtained by the multiple scale method(MSM) and the Newton-Raphson method. The frequency-and force-response curves are used to investigate the dynamic behaviors of the inclined CFRP cable under simultaneous internal(between the lowest in-plane and out-of-plane modes) and external resonances, i.e., the primary resonances induced by the excitations of the in-plane mode,the out-of-plane mode, and both the in-plane mode and the out-of-plane mode, respectively. The effects of the key parameters, e.g., Young's modulus, the excitation amplitude,and the frequency on the dynamic behaviors, are discussed in detail. Some interesting phenomena and results are observed and concluded.

关键词： inclined carbon fiber reinforced polymer(CFRP)cable bifurcation nonlinear dynamics internal resonance external resonance

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Field measurements for calibration of simplified models of the stiffening effect of infill masonry walls in high-rise RC framed and shear-wall buildings

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Earthquake engineering and engineering Vibration 2020年第1期19卷 87-104页

作者： Zhou Yun Pei Yilin Zhou Yi Hyeon-Jong Hwang Yi Weijian College of Civil engineering Hunan UniversityChangsha 410082China hunan Provincial key Lab on damage diagnosis for engineering structures Hunan UniversityChangsha 410082China key laboratory for Green&Advanced Civil engineering Materials and Application Technology of hunan province Hunan UniversityChangsha 410082China

As a type of nonstructural component, infill walls play a significant role in the seismic behavior of high-rise buildings. However, the stiffness of the infill wall is generally either ignored or considered by simplified empirical criteria that lead to a period shortening. The difference can be greatly decreased by using a structural identification methodology. In this study, an ambient vibration test was performed on four on-site reinforced concrete high-rise buildings, and the design results were compared with the PKPM models using corresponding finite element(FE) models. A diagonal strut model was used to simulate the behavior of the infill wall, and the identified modal parameters measured from the on-site test were employed to calibrate the parameters of the diagonal strut in the FE models. The SAP2000 models with calibrated elastic modulus were used to evaluate the seismic response in the elastic state. Based on the load-displacement relationship of the infill wall, nonlinear dynamic analysis models were built in PERFORM-3 D and calibrated using the measured modal periods. The analysis results revealed that the structural performance under small/large earthquake records were both strengthened by infill walls, and the contribution of infill walls should be considered for better accuracy in the design process.

关键词： high-rise building ambient vibration test model calibration infi ll wall seismic performance nonlinear dynamic analysis

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Innovative steel-UHPC composite bridge girders for long-span bridges

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Frontiers of Structural and Civil engineering 2019年第4期13卷 981-989页

作者： Xudong SHAO Lu DENG Junhui CAO key laboratory for Wind and Bridge engineering of hunan province Hunan University Changsha 410082 China

Steel and steel-concrete composite girders are two types of girders commonly used for long-span bridges. However, practice has shown that the two types of girders have some drawbacks. For steel girders, the orthotropic steel deck (OSD) is vulnerable to fatigue cracking and the asphalt overlay is susceptible to damage such as rutting and pot holes. While for steel-concrete composite girders, the concrete deck is generally thick and heavy, and the deck is prone to cracking because of its low tensile strength and high creep. Thus, to improve the serviceability and durability of girders for long-span bridges, three new types of steel-UHPC lightweight composite bridge girders are proposed, where UHPC denotes ultra-high performance concrete. The first two types consist of an OSD and a thin UHPC layer while the third type consists of a steel beam and a UHPC waffle deck. Due to excellent mechanical behaviors and impressive durability of UHPC, the steel-UHPC composite girders have the advantages of light weight, high strength, low creep coefficient, low risk of cracking, and excellent durability, making them competitive alternatives for long-span bridges. To date, the proposed steel-UHPC composite girders have been applied to 14 real bridges in China. It is expected that the application of the new steel-UHPC composite girders on long-span bridges will have a promising future.

关键词： steel-UHPC composite bridge girder long-span bridge orthotropic steel deck fatigue cracking durability

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A Feasible and Novel Multi-Generation System Taking Advantage of Two-Stage Compressor for Luxury Hotels

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Journal of Thermal Science 2021年第3期30卷 817-827页

作者： LI Hongqiang ZHOU Saiqun HE Changjie DENG Lu LI Lu LI Shuisheng ZHANG Guoqiang College of Civil engineering Hunan UniversityChangsha 410082China National Center for International Research Collaboration in Building Safety and Environment(NCIRCBSE) Hunan UniversityChangsha 410082China key laboratory of Building Safety and Energy Efficiency of the Ministry of Education Hunan UniversityChangsha 410082China 3rd Construction Co. Ltd of China Construction Fifth EngineeringChangsha 410004China key laboratory for damage diagnosis of engineering structures of hunan province Hunan UniversityChangsha 410082China Ltd of China Construction Fifth engineering Changsha 410004China

In order to satisfy heating,cooling and domestic hot water demand and energy conversion in luxury hotels,a feasible and novel multi-generation system taking advantage of the two-stage compressor was proposed and *** feature of this novel system is that the compressing power can be reduced and domestic water can be generated at the same time by adopting two-stage compressors instead of conventional one-stage compressor with a high compressing *** energy-saving mechanism and two operating modes were introduced in *** a further way,the thermodynamic performance was calculated by Aspen Plus so as to make a better understanding of this novel *** the calculation results showed that,in summer and transition seasons operating mode,the system can obtain COP(Coefficient of Performance)7.3,and 60℃ domestic hot water,when evaporating temperature is 4℃;while,in winter season operating mode,the system can obtain COP 3.1,and 58℃ domestic hot water,when evaporating temperature is-24℃.Compared with the conventional independent systems,this system can achieve higher energy-efficient,higher waste heat recovery,reduce energy consumption,and meet multiple energy demands simultaneously.

关键词： two-stage compression building energy conversion heat recovery district energy systems energy saving multi-energy output

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Optimal design and effectiveness evaluation for inerter-based devices on mitigating seismic responses of base isolated structures

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Earthquake engineering and engineering Vibration 2021年第4期20卷 1021-1032页

作者： Li Yafeng Li Shouying Chen Zhengqing key laboratory for Wind and Bridge engineering of hunan province College of Civil EngineeringHunan UniversityChangsha 410082China

The optimal design and effectiveness of three control systems,tuned viscous mass damper(TVMD),tuned inerter damper(TID)and tuned mass damper(TMD),on mitigating the seismic responses of base isolated structures,were systematically ***,the seismic responses of the base isolated structure with each control system under white noise excitation were ***,the structural parameter optimizations of the TVMD,TID and TMD were conducted by using three different *** results show that the three control systems were all effective in minimizing the root mean square value of seismic responses,including the base shear of the BIS,the absolute acceleration of structural SDOF,and the relative displacement between the base isolation floor and the ***,considering the superstructure as a structural MDOF,a series of time history analyses were performed to investigate the effectiveness and activation sensitivity of the three control systems under far field and near fault seismic *** results show that the effectiveness of TID and TMD with optimized parameters on mitigating the seismic responses of base isolated structures increased as the mass ratio increases,and the effectiveness of TID was always better than TMD with the same mass *** TVMD with a lower mass ratio was more efficient in reducing the seismic response than the TID and ***,the TVMD,when compared with TMD and TID,had better activation sensitivity and a smaller stroke.

关键词： base isolated structure inerter optimal design seismic response vibration control

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Revisited dynamic modeling and eigenvalue analysis of the cable-stayed beam

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Acta Mechanica Sinica 2020年第4期36卷 950-963页

作者： Lianhua Wang Xiaoyu Zhang Kai He Jian Peng College of Civil engineering Hunan UniversityChangsha 410082China key laboratory for Wind and Bridge engineering of hunan province Hunan UniversityChangsha 410082China Guangxi Communications Design Group Co. LtdNanning 530022China hunan Provincial key laboratory of structures for Wind Resistance and Vibration Control Hunan University of Science and TechnologyXiangtan 411201China

In this study,the Hamilton’s principle is applied to revisit the dynamic modeling of the cable-stayed beam,and the motion equations governing the nonlinear response of the cable-stayed beam are *** corresponding boundary terms are transformed to the dynamic equilibrium conditions through the continuity of the displacement at the anchoring *** the standard condensation procedure,the condensed model of the cable-stayed beam is *** eigenvalue analysis is performed to determine the closed-form eigenvalue solution of the linear problems,and two types of eigenvalue solution are *** is shown that the frequency spectrum of the cable-stayed beam exhibits the curve veering and crossover *** to these phenomena,the mode shapes of the cable-stayed beam may exhibit the coupling ***,the discrete model of the cable-stayed beam is determined,and the possible nonlinear interactions are discussed.

关键词： Cable-stayed beam Dynamic modeling Natural frequencies Mode shapes Curve veering

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