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Dynamic behavior of tunneling triboelectric charges in two-dimensional materials

International Journal of Minerals,Metallurgy and Materials 2023年第9期30卷 1801-1808页

作者： Xuan Zhao Liangxu Xu Xiaochen Xun Fangfang Gao Qingliang Liao Yue Zhang Academy for Advanced Interdisciplinary Science and Technology School of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijing 100083China Beijing Advanced Innovation Center for Materials Genome Engineering Beijing Key Laboratory for Advanced Energy Materials and TechnologiesUniversity of Science and Technology BeijingBeijing 100083China

Although the research history of triboelectrification has been more than 2000 years, there are still many problems to be solved so far.The use of scanning probe microscopy provides an important way to quantitatively study the transfer, accumulation, and dissipation of triboelectric charges in the process of triboelectrification. Two-dimensional materials are considered to be key materials for new electronic devices in the post-Moore era due to their atomic-scale size advantages. If the electrostatic field generated by triboelectrification can be used to replace the traditional gate electrostatic field, it is expected to simplify the structure of two-dimensional electronic devices and reconfigure them at any time according to actual needs. Here, we investigate the triboelectrification process of various two-dimensional materials such as MoS_(2), WSe_(2),and ZnO. Different from traditional bulk materials, after two-dimensional materials are rubbed, the triboelectric charges generated may tunnel through the two-dimensional materials to the underlying substrate surface. Because the tunneling triboelectric charge is protected by the twodimensional material, its stable residence time on the substrate surface can reach more than 7 days, which is more than tens of minutes for the traditional triboelectric charge. In addition, the electrostatic field generated by the tunneling triboelectric charge can effectively regulate the carrier transport performance of two-dimensional materials, and the source–drain current of the field effect device regulated by the triboelectric floating gate is increased by nearly 60 times. The triboelectric charge tunneling phenomenon in two-dimensional materials is expected to be applied in the fields of new two-dimensional electronic devices and reconfigurable functional circuits.

关键词： two-dimensional materials triboelectric charge Dynamic behavior reconfigurable electronics

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Life-Inspired Endogenous Dynamic behavior of Lipid Droplet-like Microcompartments in Artificial Adipocyte-like Structures

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CCS Chemistry 2021年第11期3卷 2782-2794页

作者： Xiaoliang Wang Yan Huang Youping Lin Haixu Chen Junbo Li Chunyu Zhao Xiaoman Liu Li Yang Xin Huang MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150001

Chemical systems that can replicate cellular behaviors are gaining increasing attention and are being used to study various biological processes.Here,a protein-or amylose-based assembly at an oil/water interface was employed to construct a large compartmentalized adipocyte-like structure,and a lipid droplet-like microcompartment(amylose-polymerstabilized 2-ethyl-1-hexanol microcompartment),which exhibits floating behaviors driven by the amylose-polymer micelle solubilization,was introduced inside these adipocyte-like structures.When the lipase-based catalytic reaction and the external oil composition were controlled and another lipid droplet-like microcompartment(lipase-stabilized tributyrin microcompartment)was introduced,then a series of Dynamic behaviors were exhibited by the two types of lipid droplet-like microcompartments,including growth,self-sorting,and fusion within the adipocyte-like structures.Therefore,it is anticipated that this autonomous generation of hierarchical multicompartments represents a breakthrough compared to the traditional bottom-up strategies,and the artificial life systems we studied could contribute a chemical-based strategy of understanding the process of lipid droplet growth and fusion inside a living adipocyte cell.

关键词： artificial adipocyte-like structures lipid droplet-like microcompartments selfsorting endogenous growth Dynamic behavior

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Dynamic behavior of bridge-erecting machine subjected to moving mass suspended by wire ropes

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Applied Mathematics and Mechanics(English Edition) 2016年第6期37卷 741-748页

作者： Shaopu YANG Xueqian FANG Jianchao ZHANG Dujuan WANG School of Mechanical Engineering Shijiazhuang Tiedao University China Railway Engineering Equipment Group Co. Ltd.

The Dynamic behavior of a bridge-erecting machine, carrying a moving mass suspended by a wire rope, is investigated. The bridge-erecting machine is modelled by a simply supported uniform beam, and a massless equivalent ＂spring-damper＂ system with an effective spring constant and an effective damping coefficient is used to model the moving mass suspended by the wire rope. The suddenly applied load is represented by a unitary Dirac Delta function. With the expansion method, a simple closed-form solution for the equation of motion with the replaced spring-damper-mass system is formulated. The characters of the rope are included in the derivation of the differential equation of motion for the system. The numerical examples show that the effects of the damping coefficient and the spring constant of the rope on the deflection have significant variations with the loading frequency. The effects of the damping coefficient and the spring constant under different beam lengths are also examined. The obtained results validate the presented approach, and provide significant references in the design process of bridgeerecting machines.

关键词： bridge-erecting machine wire rope Dynamic behavior equivalent ＂spring-damper＂ system

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Dynamic behavior Analysis of Finger Seal Based on Equivalent dynamic Model

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Chinese Journal of Mechanical Engineering 2010年第5期23卷 590-599页

作者： SU Hua CHEN Guoding School of Mechatronics Northwestern Polytechnical University Xi ＇an 710072 China

Finger seal is a new technology developed for gas path sealing in gas turbine engine.It has been paid attention to its good sealing performance and lower manufacture cost.The vibration behavior of finger seal is not be considered in performance analysis for the contact finger seal with compliant geometric configuration,then this will influence the reliability of the performance analysis and the parametric design of a finger seal.According to the dynamic character of finger seal,the harmonic vibration and free vibration models of a repetitive section of a two-layer finger seal that contains one high and one low finger seal are established separately.The Dynamic behavior of finger seal in different working conditions is obtained based on the dynamic response analysis of finger＇s vibrations.The dynamic low hysteresis and low wear terms based on the equivalent dynamic model of finger seal are put forward,which can be used to predict the Dynamic behavior of finger seal.As an example,the Dynamic behaviors of an 8-layer finger seal and a 10-layer finger seal were predicted,and the validity of the prediction was demonstrated by the leakage test results of these two finger seals.The work presented here not only could make the dynamic analysis of finger seal with complicated structure simple and easy especially for multi-layer finger seal system,but also suggest a useful method for designing the finger seal with good Dynamic behavior by means of different seal layers assembly.

关键词： finger seal Dynamic behavior vibration

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Computational and experimental study on Dynamic behavior of underwater robots propelled by bionic undulating fins

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Science China(Technological Sciences) 2010年第11期53卷 2966-2971页

作者： ZHOU Han HU TianJiang XIE HaiBin ZHANG DaiBing SHEN LinCheng College of Mechatronic Engineering and Automation National University of Defense TechnologyChangsha 410073China

Bionic undulating fins, inspired by undulations of the median and/or paired fin (MPF) fish, have a bright prospective for un-derwater missions with higher maneuverability, lower noisy, and higher efficiency. In the present study, a coupled computa-tional fluid dynamics (CFD) model was proposed and implemented to facilitate numerical simulations on hydrodynamic ef-fects of the bionic undulating robots. HydroDynamic behaviors of underwater robots propelled by two bionic undulating fins were computationally and experimentally studied within the three typical desired movement patterns, i.e., marching, yawing and yawing-while-marching. Moreover, several specific phenomena in the bionic undulation mode were unveiled and dis-cussed by comparison between the CFD and experimental results under the same kinematics parameter sets. The contributed work on the Dynamic behavior of the undulating robots is of importance for study on the propulsion mechanism and control algorithms.

关键词： bionic underwater robot CFD Dynamic behavior undulating fins

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电磁轴承系统动力学行为与辅助轴承性能的关系研究

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风机技术 2021年第4期63卷 67-74页

作者：孙喆杨国军赵晶晶闫循石时振刚 Institute of Nuclear and New Energy Technology Tsinghua University Collaborative Innovation Center of Advanced Nuclear Energy Technology The Key Laboratory of Advanced Reactor Engineering and Safety Ministry of Education

Auxiliary bearings(ABs)are important backup and safety components in active magnetic bearing(AMB)systems.The performance of ABs significantly affects the reliability,safety,and serviceability of theAMB system and the rotating equipment.Research on the Dynamic behavior during the touchdown process is crucial for analyzing the severity of the touchdown and the behavior is closely related to the performance of theAB.In this paper,a friction torque coefficient is introduced to evaluate the performance ofAB and the touchdown process is simulated and evaluated with various values of this coefficient with a detailed rotor-AB model of a verticalAMB system.The results show that large friction torque coefficient will result in undesired backward whirl of the rotor and catastrophic large load on the AB.Based on these results,this paper suggests that large friction torque coefficient ofABshould be avoided in practice.

关键词： Active Magnetic Bearing System Auxiliary Bearing Rotor Touchdown Dynamic behavior Friction Torque Coefficient

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Dynamic behavior of Two Part Towing Cable System During Turning

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Journal of Shanghai Jiaotong university(Science) 2018年第3期23卷 444-455页

作者：高慧王志博 Jiangsu University of Science and Technology Zhangjiagang 215600 Jiangsu China Shanghai Ship and Shipping Research Institute Shanghai 200135 China

An improved numerical method is used to simulate the Dynamic behavior of a two part towing cable systems during turnings. In U turns and full turns, periodical heave motions are found both for the towed vehicle and for the depressor. Periodic motions of the subsea units and of the cable surface tension are closely related to the turning parameters, such as turning velocity and turning radius. System parameters, such as length of the second cable and the vehicle hydrodynamics, also damp turning instability.

关键词： towing cable systems Dynamic behavior periodic motion turning operation

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Seasonally frozen soil effects on the Dynamic behavior of highway bridges

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Research in Cold and Arid Regions 2012年第1期4卷 13-20页

作者： ZhaoHui ＂Joey＂ Yang Qiang Li Elmer E. Marx JinChi Lu Department of Civil Engineering University of Alaska-Anchorage Anchorage Alaska USA Bridge Design Engineer State of Alaska DOT＆PF 3132 Channel Drive Juneau AK 99801 USA Assistant Project Scientist Department of Structural Engineering University of California San Diego La Jolla CA 92093 USA

Frozen ground is significantly stiffer than unfrozen ground. For bridges supported on deep foundations, bridge stiffness is also measurably higher in winter months. Significant changes due to seasonal freezing in bridge pier boundary conditions require addi- tional detailing in order to ensure a ductile performance of the bridge during a design earthquake event. This paper reports the lat- est results obtained from a project that systematically investigated the effects of seasonally frozen soil on the seismic behavior of highway bridges in cold regions. A bridge was chosen and was monitored to study its seismic performance and assess the impact of seasonally frozen soil on its dynamic properties. A Finite Element （FE） model was created for this bridge to analyze the impact of seasonal frost. It was found that when frost depth reaches 1.2 m, the first transverse modal frequency increases about 200% when compared with the no-frost case. The results show that seasonal frost has a significant impact on the overall dynamic be- havior of bridges supported by pile foundations in cold regions, and that these effects should be accounted for in seismic design.

关键词： Dynamic behavior , seasonally frozen soil pile foundation earthquake Finite Element modeling

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An Assessment of the Dynamic behavior and Failure Mechanism of Form Bracing Materials

An Assessment of the Dynamic Behavior and Failure Mechanism ...

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2014海峡两岸破坏科学与材料试验学术会议暨第十二届破...

作者： Y.J.Huang G.C.Chang institute of labor occupational safety and healthministry of labor

Form bracing is vital to the building of reinforced concrete structures;but since forms themselves are temporary structures that are dismantled after use,their safety can be easily overlooked.A large number of government-constructed bridges in Taiwan use field bracing systems.The Wugu-Yangmei elevated section of National Freeway 1 provides an example of the use of this kind of system.Field bracing technology has the advantages of maturity and the ability to match almost all moldings,yet long construction periods and vulnerability to the effects of topography and geology can potentially cause the supports to change shape.According to data on accidents that have occurred over the years,one of the main causes of field bracing collapse is inadequate bearing capacity.To enhance the safety of heavy bridge construction,we studied the interaction between the support frame and the bearing capacity of the foundation.Analysis of the occupational accidents included in this study revealed that a frequent cause of support frame collapse is slippage of the structure itself or inadequate gripping force of the steel shackles linking the structure and the upper form.We planned,therefore,to carry out static and dynamic testing of support frames Finally,we formulated conclusions and suggestions for relevant bodies such as bridge construction units and the Council of Labor Affairs with the aim of reducing accidents.In addition,we organized seminars and educational meetings to promote safety assessment techniques and monitoring systems.

关键词： form bracing system Dynamic behavior failure mechanism

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Dynamic behavior OF PILES EMBEDDED IN TRANSVERSELY ISOTROPIC LAYERED MEDIA

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Acta Mechanica Sinica 1997年第3期13卷 241-252页

作者：郑铁生 Department of Engineering Mechanics Xi'an Jiaotong UniversityXi'an710049China

Dynamic behavior of single pile embedded in transversely isotropic layered media is investigated using the finite element method combined with dynamic stiffness matrices of the soil derived from Green's function for ring loads. The influence of soil anisotropy on the Dynamic behavior of piles is examined through a series of parametric studies.

关键词： pile-soil system soil anisotropy transversely isotropic layered media Dynamic behavior finite element method

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