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Bio-inspired construction of electrocatalyst decorated hierarchical porous carbon nanoreactors with enhanced mass transfer ability towards rapid polysulfide redox reactions

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Nano Research 2021年第11期14卷 3942-3951页

作者： shijie zhang Yongshang zhang Guosheng Shao Peng zhang School of Materials Science and Engineering Zhengzhou UniversityZhengzhou450001China State Centre for International Cooperation on Designer Low-Carbon&Environmental Materials(CDLCEM) Zhengzhou University100 Kexue AvenueZhengzhou450001China Zhengzhou Materials Genome Institute Building 2ZhongyuanzhiguXingyang450100China

Li-S batteries are considered as a highly promising candidate for the next-generation energy storage system, attributing to their tremendous energy density. However, the two-dimensional island nucleation-growth process of lithium sulfide leads to a thick insulating film covering the electrode, inducing slow electrons transfer and mass-transfer of ions and liquid sulfur species in working Li-S cells. Here, we demonstrate a bio-inspired strategy of constructing ant-nest-like hierarchical porous ultrathin carbon nanosheet networks with the implants of metallic nanoparticles electrocatalysts (HPC-MEC) as efficient nanoreactors enabling rapid mass transfer, via a simple and green NaCl template. Such nanoreactors with a large active surface area could effectively anchor polysulfides for mitigating the shuttle effect, facilitating uniformly thin Li2S film, and promoting the mass transfer for fast sulfur species conversions. This helps contribute to a continuously high sulfur utilization in Li-S batteries with the HPC-MEC reactors. As a typical exhibition, cobalt embedded hierarchical porous carbon (HPC-Co) could realize to deliver a remarkably high specific capacity of 1,540.6 mAh·g−1, an excellent rate performance of 878.8 mAh·g−1 at 2 C, and high area capacity of 11.6 mAh·cm−2 at a high sulfur load of 10 mg·cm−2 and low electrolyte/sulfur ratio of 5 µL·mg−1.

关键词： sulfur species reactor hierarchical porous carbon network electrocatalyst high sulfur loading low electrolyte/sulfur ratio

Robust image-based coordinated control for spacecraft formation flying

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Chinese Journal of Aeronautics 2022年第9期35卷 268-281页

作者： Dayong HU Xiangtian ZHAO shijie zhang Research Center of Satellite Technology Harbin Institute of TechnologyHarbin 150080China

This paper addresses a coordinated control problem for Spacecraft Formation Flying(SFF). The distributed followers are required to track and synchronize with the leader *** using the feature points in the two-dimensional image space, an integrated 6-degree-of-freedom dynamic model is formulated for spacecraft relative motion. Without sophisticated threedimensional reconstruction, image features are directly utilized for the controller design. The proposed image-based controller can drive the follower spacecraft in the desired configuration with respect to the leader when the real-time captured images match their reference counterparts. To improve the precision of the formation configuration, the proposed controller employs a coordinated term to reduce the relative distance errors between followers. The uncertainties in the system dynamics are handled by integrating the adaptive technique into the controller, which increases the robustness of the SFF system. The closed-loop system stability is analyzed using the Lyapunov method and algebraic graph theory. A numerical simulation for a given SFF scenario is performed to evaluate the performance of the controller.

关键词： Algebraic graph theory Coordinated control Image-based visual servoing Robust control Spacecraft formation flying

Distributed adaptive prescribed-time orbit containment control for satellite cluster flight

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Chinese Journal of Aeronautics 2024年第8期37卷 342-357页

作者： Tingting zhang shijie zhang Huayi LI Xiangtian ZHAO Research Center of Satellite Technology Harbin Institute of TechnologyHarbin 150080China State Key Laboratory of Networking and Switching Technology Beijing University of Posts and TelecommunicationsBeijing 100876China

The distributed prescribed-time orbit containment control for the satellite cluster flight with multiple dynamic leaders is *** directed information communication topology between followers is taken into account in the overall *** the satellite mass is assumed to be constant,a distributed prescribed-time orbit containment controller is,firstly,presented to drive the followers into the dynamic convex hull produced by multiple ***,the parameter uncertainty is considered,and a prescribed-time sliding mode estimator is introduced to estimate the desired velocity of each *** on the estimated state,a novel distributed adaptive prescribed-time orbit containment control scheme is *** Lyapunov stability theory is utilized to prove the prescribed-time stability of the closed-loop ***,several numerical simulations and comparison of different control methods are provided to verify the effectiveness and superiority of the proposed control method.

关键词： Satellite cluster Orbit containment control Prescribed-time control Parameter uncertainty Directed communication graph

KNOWLEDGE AND XML BASED CAPP SYSTEM

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Chinese Journal of Mechanical Engineering 2006年第3期19卷 344-347页

作者： zhang shijie SONG Laigang Shenyang Institute of Automation Chinese Academy of Sciences Shenyang 110016 China

In order to enhance the intelligent level of system and improve the interaetivity with other systems, a knowledge and XML based computer aided process planning （CAPP） system is implemented. It includes user management, bill of materials（BOM） management, knowledge based process planning, knowledge management and database maintaining sub-systems. This kind of nesting knowledge representation method the system provided can represent complicated arithmetic and logical relationship to deal with process planning tasks. With the representation and manipulation of XML based technological file, the system solves some important problems in web environment such as information interactive efficiency and refreshing of web page. The CAPP system is written in ASP VBScript, JavaScript, Visual C＋＋ languages and Oracle database. At present, the CAPP system is running in Shenyang Machine Tools. The functions of it meet the requirements of enterprise production.

关键词： Web Extensible markup lanugage(XML) Knowledge based CAPP

Thermodynamic Performance Analysis of E/F/H-Class Gas Turbine Combined Cycle with Exhaust Gas Recirculation and Inlet/Variable Guide Vane Adjustment under Part-Load Conditions

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Journal of Thermal Science 2024年第1期33卷 348-367页

作者： LI Keying CHI Jinling WANG Bo zhang shijie Key Lab of Advanced Energy and Power Institute of Engineering ThermophysicsChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China School of Mechanical Electronic&Information Engineering China University of Mining&Technology-BeijingBeijing 100083China

Exhaust gas recirculation control(EGRC),an inlet air heating technology,can be utilized in combination with inlet/variable guide vane control(IGV/VGVC) and fuel flow control(FFC) to regulate the load,thereby effectively improving the part-load(i.e.,off-design) performance of the gas turbine combined cycle(GTCC).In this study,the E-,F-,and H-Class EGR-GTCC design and off-design system models were established and validated to perform a comparative analysis of the part-load performance under the EGR-IGV-FFC and conventional IGV-FFC strategies in the E/F/H-Class *** show that EGR-IGV-FFC has considerable potential for the part-load performance enhancement and can show a higher combined cycle efficiency than IGV-FFC in the E-,F-,and H-Class ***,the part-load performance improvement in the corresponding GTCC was weakened for the higher class of the gas turbine because of the narrower load range of EGR action and the deterioration of the gas turbine ***,EGR-IGV-FFC was inferior to IGV-FFC in improving the performance at loads below 50% for the H-Class *** results obtained in this paper could help guide the application of EGR-IGV-FFC to enhance the part-load performance of various classes of GTCC systems.

关键词： E/F/H-Class gas turbine combined cycle performance improvement part-load conditions exhaust gas recirculation inlet/variable guide vane

Current advances of transition metal dichalcogenides in electromagnetic wave absorption:A brief review

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International Journal of Minerals,Metallurgy and Materials 2023年第3期30卷 428-445页

作者： shijie zhang Jiying Li Xiaotian Jin Guanglei Wu School of Material Science and Engineering Henan Province Engineering Research Center of New Cermet Matrix CompositesHenan University of TechnologyZhengzhou 450001China Institute of Materials for Energy and Environment State Key Laboratory of Bio-fibers and Eco-textilesCollege of Materials Science and EngineeringQingdao UniversityQingdao 266071China

Transition metal dichalcogenides(TMDs)show great advantages in electromagnetic wave(EMW)absorption due to their unique structure and electrical *** research works on TMD-based EMW absorbers have been conducted in the last three years,and the comprehensive and systematical summary is still a ***,it is of great significance to elaborate on the interaction among the morphologies,structures,phases,components,and EMW absorption performances of TMD-based *** review is devoted to analyzing TMD-based absorbers from the following perspectives:the EMW absorption regulation strategies of TMDs and the latest progress of TMD-based hybrids as EMW *** absorption mechanisms and component-performance dependency of these achievements are also ***,a straightforward insight into industrial revolution upgrading in this promising field is proposed.

关键词： transition metal dichalcogenides phase manipulation hybrids hierarchical structure absorption mechanism

Off-Design Performance of 9F Gas Turbine Based on gPROMs and BP Neural Network Model

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Journal of Thermal Science 2022年第1期31卷 261-272页

作者： HAO Xuedi SUN Lei CHI Jinling zhang shijie School of Mechanical Electronic&Information Engineering China university of Mining&Technology-BeijingBeijing 100083China Key Laboratory of Intelligent Mining and Robotics Ministry of Emergency ManagementBeijing 100083China Key Laboratory of Advanced Energy and Power Institute of Engineering ThermophysicsChinese Academy of SciencesBeijing 100190China

Gas turbines are increasingly and widely used,whose research and production reflect a country’s industrial capacity and *** to the changeable working environment,gas turbines usually work under the condition of simultaneous changes of ambient temperature,load and ***,the current researches mainly focus on the change in single condition,and do not fully consider the simultaneous change in different *** the basis of single condition,this paper further studies the dual off-design performance of gas turbines under three conditions:temperature-load,fuel-load and ***,the whole machine model of a gas turbine is established,in which the compressor model has the greatest impact on the performance of gas ***,this paper obtains a more accurate compressor model by combining the engineering modeling advantages of gPROMs and the powerful mathematical calculation ability of MATLAB neural ***,according to the established gas turbine model,the dual off-design performance is studied,which is mainly based on the parameter of output and *** result shows that the efficiency and power output of gas turbines will decrease with the increase of ambient *** the decrease of fuel calorific value,power output and efficiency will *** the load decreases,the efficiency of the gas turbines will decrease,and these changes are consistent with the single off-design ***,when the fuel and temperature change simultaneously,only adjusting the IGV angle cannot avoid the surge when the temperature is above 30°*** this time,it is necessary to adjust the extraction rate in order to ensure the safe and stable operation of gas ***,the research on dual off-design performance of gas turbines has an important significance for the peak shaving operation of gas turbines.

关键词： off-design performance gas turbine gPROMs MATLAB neural network peak shaving operation

Recent Advances in Effective Reduction of Graphene Oxide for Highly Improved Performance Toward Electrochemical Energy Storage

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Energy & Environmental Materials 2018年第1期1卷 5-12页

作者： Peng zhang Zhi Li shijie zhang Guosheng Shao School of Materials Science and Engineering Zhengzhou UniversityZhengzhou450001China State Centre for International Cooperation on Designer Low-Carbon&Environmental Materials(CDLCEM) Zhengzhou UniversityZhengzhou450001Henan China Zhengzhou Materials Genome Institute ZhongyuanzhiguXingyang450100China

The demand for high-quality graphene from various applications promotes the exploration of various synthesis methods such as chemical vapor deposition,chemical reduction of graphite oxide,liquid-phase exfoliation,and electrochemical *** those,chemical treatments for the production of reduced graphene oxide(RGO)dictate the current technologies for mass production of graphene ***,such conventional chemical reduction methods are rather ineffective in removing oxygen-containing functional groups from graphene oxide(GO),with resultant RGO products containing high level of structural *** leads to significantly damaged crystallinity and drastically lowered electric and thermal conductivity,which is probably the main bottleneck to limit the performance of RGO-based *** efforts such as thermal reduction,microwave-irradiation reduction,or other novel reduction methods(e.g.,photoreduction)have been developed to repair defects in RGO *** perspective review is to outline the latest advances toward effective reduction of GO for significantly enhanced *** demonstrate that effectively repaired RGO with large specific surface area and highly improved crystallinity is key to highly improved electric and thermal conductivity,thus leading to significantly enhanced properties essential for chemical energy storage devices.

关键词： materials conductivity removing

Consensus seeking in multiagent cooperative control systems with bounded control input

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控制理论与应用（英文版） 2011年第2期9卷 210-214页

作者： zhang, shijie Duan, Guangren Center for Control Theory and Guidance Technology Harbin Institute of Technology Harbin Heilongjiang 150001 China

Consensus algorithms in multiagent cooperative control systems with bounded control input are studied in this *** algorithms are considered for the single-integrator dynamics and double-integrator dynamics under different communication interaction topologies,and show that consensus is reached asymptotically using the algorithm proposed in this paper for the single-integrator dynamics if the undirected interaction graph is connected,and consensus is reached asymptotically if the directed interaction graph is strongly connected,*** addition,the paper further shows that consensus is reached asymptotically using the algorithm proposed for the double-integrator dynamics if the directed interaction graph is strongly *** effectiveness of these algorithms is demonstrated through simulations.

关键词： Consensus algorithms Cooperative control Graph theory Multiagent systems