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Stochastic dynamics of conduction failure of action potential along nerve fiber with Hopf bifurcation

Science China(Technological Sciences) 2019年第9期62卷 1502-1511页

作者： zhang xinjing GU HuaGuang GUAN LiNan School of Aerospace Engineering and Applied Mechanics Tongji University

Action potentials can be induced by external electronic impulsive stimulations applied at one end of the unmyelinated fibers(C-fibers), while some action potentials fail to conduct to the other end of the fiber when the stimulation frequency becomes high. Such a phenomenon is called as conduction failure, which was observed in the biological experiments and related to the painful diabetic neuropathy, inflammation, and trauma in the previous studies. On-off firing pattern was recorded from the fiber when conduction failure happened. In the present study, the diffusion Hodgkin-Huxley(HH) model with resting state near a Hopf bifurcation is adopted to simulate the experimental observations. When the periodic electrical pulses with high frequency are applied to one end of the fiber described by the deterministic HH model, conduction failure and the corresponding firing patterns different from the on-off firing pattern are simulated. When noise is introduced to form the stochastic HH model, the firing pattern corresponding to conduction failure becomes the on-off firing pattern, which is characterised by transition behaviors between on-phase(continuous action potentials) and off-phase(a long quiescent state) and large variations in the durations of both phases. Furthermore, the increase of potassium conductance can enhance the conduction failure degree, which closely matches those observed in the experiment and is suggested to be related to the reduction of pain signals. The results show that noise is an important factor to evoke the on-off firing pattern, reveal the functional capability in the pain signals propagation along C-fiber,and present a possible measure for the treatment of chronic pain.

关键词： neural firing conduction failure Hopf bifurcation periodic pulse stimulus C-fiber

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Global dissipativity of stochastic Lotka-Volterra system with feedback controls

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International Journal of Biomathematics 2017年第2期10卷 127-139页

作者： Qimin zhang xinjing zhang Hongfu Yang School of Mathematics and StatisticsNingxia University Yinchuan 750021 P. R. China School of Mathematics and Information Sciences Beifang University of Nationalities Yinchuan 750021 P R. China

In this paper, a class of stochastic Lotka Volterra system with feedback controls is considered. The purpose is to establish some criteria to ensure the system is globally dissipative in the mean square. By constructing suitable Lyapunov functions as well as combining with Jensen inequality and Ito formula, the sufficient conditions are established and they are expressed in terms of the feasibility to a couple linear matrix inequalities （LMIs）. Finally, the main results are illustrated by examples.

关键词： Lyapunov functions linear matrix inequalities Ito formula global dissipativity in mean.

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Performance in the Discharge Process of a Novel Zeolite-Water Adsorption Thermal Energy Storage System

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Journal of Thermal Science 2023年第4期32卷 1626-1634页

作者： YUE Xiuyan XU Yujie ZHOU Xuezhi zhang xinjing LINGHU Youqiang WANG Xiang CHEN Haisheng Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing100190China University of Chinese Academy of Sciences Beijing100049China National Energy Large Scale Physical Energy Storage Technologies R&D Center(Bijie) Bijie551712China

In order to effectively recover low and medium grade heat energy,a novel combined cooling and heating storage system based on zeolite-water is proposed in this *** system coupled the zeolite-water adsorption process with the water evaporation refrigeration process during discharging process to realize generating cold energy and heat energy simultaneously.A more accurate kinetic model of zeolite and water adsorption is developed,and the thermodynamic performance of discharging process of the system is numerically *** results show the system has the higher energy conversion coefficient of 1.49 and the higher energy density of 1216.6 kJ/*** change laws of system performances,such as energy generated,energy conversion coefficient and energy density,with key parameters during discharging process are *** study provides a way for efficient utilization of low and medium grade heat energy.

关键词： zeolite-water adsorption thermal energy storage combined cooling and heating discharging process kinetic model

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Economic Analysis of using Above Ground Gas Storage Devices for Compressed Air Energy Storage System

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Journal of Thermal Science 2014年第6期23卷 535-543页

作者： LIU Jinchao zhang xinjing XU Yujie CHEN Zongyan CHEN Haisheng TAN Chunqing Institute of Engineering Thermophysics Chinese Academy of Sciences University of Chinese Academy of Sciences

Above ground gas storage devices for compressed air energy storage(CAES) have three types:air storage tanks,gas cylinders,and gas storage pipelines.A cost model of these gas storage devices is established on the basis of whole life cycle cost(LCC) *** optimum parameters of the three types are determined by calculating the theoretical metallic raw material consumption of these three devices and considering the difficulties in manufacture and the influence of gas storage device *** LCCs of the three types are comprehensively analyzed and *** result reveal that the cost of the gas storage pipeline type is lower than that of the other two *** study may serve as a reference for designing large-scale CAES systems.

关键词： above ground gas storage device economic analysis life cycle cost analysis

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Increasing Coal-Fired Power Plant Operational Flexibility by Integrating Solar Thermal Energy and Compressed Air Energy Storage System

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Journal of Thermal Science 2023年第6期32卷 2032-2047页

作者： LI Xiaoyu WANG Yumeng zhang xinjing LI Bin XU Yujie CHEN Haisheng SHENG Siqing Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing100190China University of Chinese Academy of Sciences Beijing100049China School of Energy Power and Mechanical EngineeringNorth China Electric Power UniversityBaoding071003China School of Electrical and Electronic Engineering North China Electric Power UniversityBaoding071003China

This paper proposed a novel integrated system with solar energy,thermal energy storage(TES),coal-fired power plant(CFPP),and compressed air energy storage(CAES)system to improve the operational flexibility of the CFPP.A portion of the solar energy is adopted for preheating the boiler’s feedwater,and another portion is stored in the TES for the CAES discharging *** water from the CFPP condenser is used for cooling compressed air during the CAES charging *** thermodynamic performance of the integrated system under different load conditions is *** system operations in a typical day are simulated with EBSILON *** system enables daily coal saving of 9.88 t and reduces CO_(2)emission by 27.95 t compared with the original CFPP at 100%*** partial load conditions,the system enables maximum coal saving of 10.29 t and maximum CO_(2)emission reduction of 29.11 t at 75%*** system has maximum peak shaving depth of 9.42%under 40%load *** potential of the system participating ancillary service is also *** is found that the integration of solar thermal system and CAES system can bring significant ancillary service revenue to a conventional CFPP.

关键词： solar thermal compressed air energy storage coal-fired power plant thermal energy storage operation flexibility ancillary service

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Advancements in compressed air engine technology and power system integration: A comprehensive review

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Energy Reviews 2023年第4期2卷 49-62页

作者： Haifei Tian Hualiang zhang Zhao Yin Yu Liu xinjing zhang Yujie Xu Haisheng Chen Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing100190China Nanjing Institute of Future Energy System Institute of Engineering ThermophysicsChinese Academy of SciencesNanjing211135China University of Chinese Academy of Sciences Beijing100049China

The compressed air power system demonstrates the ability to convert the internal energy stored within com-pressed air into mechanical energy,thus facilitating power *** application within specific domains,such as special purpose vehicles,standby power sources,and fire and explosion prevention,holds significant research and practical value owing to its combustion-free operation,zero pollution and *** paper aims to explain the operational principles and unique features of the compressed air engine(CAE).The reasons for selecting volume-type expanders as CAE components are detailed,including an analysis of their technical characteristics and research *** on this foundation,the paper explores the operational characteristics and research status of traditional compressed air power systems installed in vehicles,with a particular focus on their limited range and excessive cold ***,the study presents a comprehensive summary of the research progress made in the last few years relating to hybrid power systems that derive from conventional compressed air power ***,the paper concludes by outlining the expected development trajectory of CAEs and compressed air power systems.

关键词： Compressed air Engine Hybrid Power system Vehicle

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Short-Term Wind Power Prediction Method Based on Combination of Meteorological Features and CatBoost

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Wuhan University Journal of Natural Sciences 2023年第2期28卷 169-176页

作者： MOU Xingyu CHEN Hui zhang xinjing XU Xin YU Qingbo LI Yunfeng Jilin Province Meteorological Information Network Center Changchun 130062JilinChina

As one of the hot topics in the field of new energy,short-term wind power prediction research should pay attention to the impact of meteorological characteristics on wind power while improving the prediction ***,a short-term wind power prediction method based on the combination of meteorological features and Cat Boost is ***,morgan-stone algebras and sure independence screening(MS-SIS)method is designed to filter the meteorological features,and the influence of the meteorological features on the wind power is ***,a sort enhancement algorithm is designed to increase the accuracy and calculation efficiency of the method and reduce the prediction risk of a single ***,a prediction method based on Cat Boost network is constructed to further realize short-term wind power *** National Renewable Energy Laboratory(NREL)dataset is used for experimental *** results show that the short-term wind power prediction method based on the combination of meteorological features and Cat Boost not only improve the prediction accuracy of short-term wind power,but also have higher calculation efficiency.

关键词： meteorological features short-term power load forecasting Cat Boost wind power

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先进压缩空气储能系统的基础研究与应用进展

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Engineering 2024年第3期34卷 246-269页

作者： xinjing zhang Ziyu Gao Bingqian Zhou Huan Guo Yujie Xu Yulong Ding Haisheng Chen Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Birmingham Centre for Energy Storage&School of Chemical Engineering University of BirminghamBirmingham B152TTUK

Decarbonization of the electric power sector is essential for sustainable ***-carbon generation technologies,such as solar and wind energy,can replace the CO_(2)-emitting energy sources(coal and natural gas plants).As a sustainable engineering practice,long-duration energy storage technologies must be employed to manage imbalances in the variable renewable energy supply and electricity *** air energy storage(CAES)is an effective solution for balancing this mismatch and therefore is suitable for use in future electrical systems to achieve a high penetration of renewable energy *** study introduces recent progress in CAES,mainly advanced CAES,which is a clean energy technology that eliminates the use of fossil fuels,compared with two commercial CAES plants at Huntorf and McIntosh which are conventional ones utilizing fossil *** CAES include adiabatic CAES,isothermal CAES,liquid air energy storage,supercritical CAES,underwater CAES,and CAES coupled with other *** principles and configurations of these advanced CAES technologies are briefly discussed and a comprehensive review of the state-of-the-art technologies is presented,including theoretical studies,experiments,demonstrations,and *** comparison and discussion of these CAES technologies are summarized with a focus on technical maturity,power sizing,storage capacity,operation pressure,round-trip efficiency,efficiency of the components,operation duration,and investment *** application trends were *** paper presents a comprehensive reference for developing novel CAES systems and makes recommendations for future research and development to facilitate their application in several areas,ranging from fundamentals to applications.

关键词： Compressed air energy storage Fundamentals Applications Technological parameters Comparison

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Special Column on Convergence of Carbon Neutral Transition via Energy Storage Technologies

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Journal of Thermal Science 2023年第6期32卷 1955-1955页

作者： XU Ben zhang xinjing RAO Zhonghao XU Chao MA Zhiwen Department of Mechanical Engineering University of HoustonUSA Institute of Engineering Thermophysics Chinese Academy of SciencesChina School of Energy and Environmental Engineering Hebei University of TechnologyChina School of Energy Power and Mechanical Engineering North China Electric Power UniversityChina National Renewable Energy Laboratory(NREL) USA

Limiting global warming to 1.5°C would be a herculean task to all human *** reach this goal,the world would have to curb its carbon emissions by at least 49%of 2017 levels by 2030 and then achieve carbon neutrality by *** renewable energy systems is a key to achieving the decarbonization ***,the intermittent nature of renewable energies is challenging because it can disrupt the daily operation of the electric *** storage technology is the key to resolve the problems of intermittency,volatility and low energy density in the large-scale utilization of clean and renewable energy.

关键词： energy Transition Convergence

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关于清晰度和分解力概念的规范化问题

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电视技术 1999年第3期23卷 48-51页

作者：张鑫镜成都电子科技大学 610054

在电视技术领域中，清晰度和分解力是用得十分广泛的两个术语，也是电视产品的重要技术指标，但相关概念的使用却甚为混乱，有必要加以澄清和规范。下文就其概念及几个有关的问题进行讨论。

关键词：清晰度分解力电视技术规范化

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