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经济复杂性与物流业碳减排关系研究

价格理论与实践 2024年第5期 140-145页

作者：叶翀郑艳红邵博福州大学经济与管理学院四川大学威斯康星大学

考察经济复杂性与物流业碳排放的关系,对降低物流业碳排放量和推动物流业可持续发展具有重要意义。本文利用2001-2020年的物流业数据,对物流业碳排放进行测算,并在传统的环境库兹涅茨曲线(EKC)框架内,导入经济复杂性这一新变量,利用格... 详细信息

考察经济复杂性与物流业碳排放的关系,对降低物流业碳排放量和推动物流业可持续发展具有重要意义。本文利用2001-2020年的物流业数据,对物流业碳排放进行测算,并在传统的环境库兹涅茨曲线(EKC)框架内,导入经济复杂性这一新变量,利用格兰杰因果检验法检验变量间的因果关系。研究结果表明:(1)经济复杂性与物流业碳排放之间存在双向格兰杰因果关系。(2)系数估计结果显示,经济复杂性与物流业碳排放之间呈非线性关系,即当经济复杂性提升到一定程度时,经济复杂性能够促进物流业碳减排。基于此,为推动物流业碳减排和促进物流业绿色低碳转型,应将经济复杂性作为政策考虑的重要因素,并建立相应的激励机制。

关键词：经济复杂性物流业碳减排

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“外国文学研究方法”课程思政教学设计案例

外国语言与文化 2024年第1期8卷 144-156页

作者：郑燕虹湖南师范大学外国语学院湖南长沙410081

本文以“肯尼斯·雷克思罗斯与道德经”的教学内容为例,展示比较研究方法在文学研究的具体运用。从历史批判的角度,把马克思主义的基本原理运用于作家和作品的分析之中,以达到课程的思政目标。在进行理论探讨和文本分析同时,深层次展示... 详细信息

本文以“肯尼斯·雷克思罗斯与道德经”的教学内容为例,展示比较研究方法在文学研究的具体运用。从历史批判的角度,把马克思主义的基本原理运用于作家和作品的分析之中,以达到课程的思政目标。在进行理论探讨和文本分析同时,深层次展示习近平总书记关于文学创作的重要论述,以加深学生对社会主义核心价值观的理解。

关键词：课程思政比较研究方法社会历史批评肯尼斯·雷克思罗斯《道德经》

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石漠化区两种下垫面小气候日动态效应

中国岩溶 2024年第4期43卷 810-821,853页

作者：王佳李生郑艳红潘雯孙彦中国林业科学研究院亚热带林业研究所浙江杭州311400 贵州普定石漠化生态系统国家级定位观测研究站贵州普定562100

为探究石漠化区异质化下垫面小气候效应,以安顺市普定县石灰岩分布区两种典型下垫面(土面、裸地)为研究对象,通过模拟试验开展近地表温、湿度日动态变化长期定量对比分析。结果表明:在时空尺度上,土面、裸地下垫面小气候日动态分异显著... 详细信息

为探究石漠化区异质化下垫面小气候效应,以安顺市普定县石灰岩分布区两种典型下垫面(土面、裸地)为研究对象,通过模拟试验开展近地表温、湿度日动态变化长期定量对比分析。结果表明:在时空尺度上,土面、裸地下垫面小气候日动态分异显著,表现为夏季太阳辐射最强时,土面各空间高度气温显著高于裸地(P<0.05),相对湿度显著低于裸地(P<0.05),引发增温、减湿效应;冬季10:00-16:00时,土面下层气温显著低于裸地(P<0.05),相对湿度显著高于裸地(P<0.05),产生降温、增湿效应。受季节性影响,土面、裸地小气候日变化程度差异显著,表现为夏季土面上层气温日较差显著高于裸地(P<0.05),加剧气温日变化;冬季土面下层温度、湿度日较差显著低于裸地(P<0.05),缓冲小气候日变化。相较于裸地,土面小气候条件更为严酷、多变。结合异质化下垫面小气候效应差异,改善局部小气候条件,对缓冲石漠化区小气候变化及加快植被生态恢复进程具有积极作用。

关键词：石漠化下垫面小气候温湿度植被恢复

Improving control effects of absence seizures using single-pulse alternately resetting stimulation (SARS) of corticothalamic circuit

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Applied Mathematics and Mechanics(English Edition) 2020年第9期41卷 1287-1302页

作者： Denggui FAN yanhong zheng Zecheng YANG Qingyun WANG School of Mathematics and Physics University of Science and Technology BeijingBeijing 100083China College of Mathematics and Informatics Fujian Normal UniversityFuzhou 350117China Department of Dynamics and Control Beihang UniversityBeijing 100191China

Presently,we develop a simplified corticothalamic(SCT)model and propose a single-pulse alternately resetting stimulation(SARS)with sequentially applying anodic(A,“+”)or cathodic(C,“−”)phase pulses to the thalamic reticular(RE)nuclei,thalamus-cortex(TC)relay nuclei,and cortical excitatory(EX)neurons,*** effects of ACC-SARS of RE,TC,and EX for the 2 Hz-4 Hz spike and wave discharges(SWD)of absence seizures are then *** m∶n on-off ACC-SARS protocol is shown to effectively reduce the SWD with the least current *** particular,when its frequency is out of the 2 Hz-4 Hz SWD dominant rhythm,the desired seizure abatements can be obtained,which can be further improved by our proposed directional steering(DS)*** dynamical explanations for the SARS induced seizure abatements are lastly given by calculating the averaged mean firing rate(AMFR)of neurons and triggering averaged mean firing rates(TAMFRs)of 2 Hz-4 Hz SWD.

关键词： epileptic absence seizure spike and wave discharge(SWD) single-pulse alternately resetting stimulation(SARS) mean field model averaged mean firing rate(AMFR) seizure control

Bifurcation analysis for Hindmarsh-Rose neuronal model with time-delayed feedback control and application to chaos control

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Science China(Technological Sciences) 2014年第5期57卷 872-878页

作者： WANG HaiXia WANG QingYun zheng yanhong School of Science Nanjing University of Science and Technology Department of Dynamics and Control Beihang University School of Mathematics and Computer Science Fujian Normal University

This paper is concerned with bifurcations and chaos control of the Hindmarsh-Rose(HR)neuronal model with the time-delayed feedback *** stability and bifurcation analysis,we find that the excitable neuron can emit spikes via the subcritical Hopf bifurcation,and exhibits periodic or chaotic spiking/bursting behaviors with the increase of external *** the purpose of control of chaos,we adopt the time-delayed feedback control,and convert chaos control to the Hopf bifurcation of the delayed feedback *** the analytical conditions under which the Hopf bifurcation occurs are given with an explicit *** on this,we show the Hopf bifurcation curves in the two-parameter ***,some numerical simulations are carried out to support the theoretical *** is shown that by appropriate choice of feedback gain and time delay,the chaotic orbit can be controlled to be *** adopted method in this paper is general and can be applied to other neuronal *** may help us better understand the bifurcation mechanisms of neural behaviors.

关键词： hopf bifurcation time-delayed feedback control chaos control neuronal model

Seizures dynamics in a neural field model of cortical-thalamic circuitry

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Science China(Technological Sciences) 2017年第7期60卷 974-984页

作者： ZHANG HongHui zheng yanhong SU JianZhong XIAO PengCheng School of Natural and Applied Science Northwestern Polytechnical University College of Mathematics and Computer Science Fujian Normal University Department of Mathematics the University of Texas at Arlington Department of Mathematics University of Evansville

The focus of this study is to explore the mechanisms during seizure behavior using a physiologically motivated by corticothalamic circuity. The model is based on the assumption that, the inhibitory projects from thalamus reticular nucleus(TRN) to specific relay nuclei(SRN) are mediated by GABAA and GABAB receptors which react different time scales in synaptic ***, we include the effects of slow modulation on the threshold current of TRN population that were found to generate bursting behavior. Our model can reproduce healthy and pathological dynamics including wake, spindle, deep sleep, and also seizure states. In addition, contour maps are used to explore the transition of different activity states. It is worthy to point out seizure duration is significantly affected by a time-varying delay as illustrated in our numerical simulation. Finally, a reduced model ignoring the cerebral cortex mass can also capture the feature of spike wave discharge as generated in the full network.

关键词： seizure spike wave neural field modeling corticothalamic

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具有新四阶项的非线性微分方程的精确解

哈尔滨商业大学学报（自然科学版） 2024年第5期40卷 592-597页

作者：张丽琴郑艳红林冠军泉州师范学院数学与计算机科学学院福建泉州352000 福建师范大学数学与统计学院福州350007

研究了一类具有新的四阶项D_(x)^(2)D_(T)^(2)非线性偏微分方程的问题,其中三个新的四阶导数项和一些二阶导数项增加了非线性方程求解的困难.构造非线性偏微分方程的Hirota双线性形式,利用Hirota双线性方法得到方程的Lump解.通过绘图分... 详细信息

研究了一类具有新的四阶项D_(x)^(2)D_(T)^(2)非线性偏微分方程的问题,其中三个新的四阶导数项和一些二阶导数项增加了非线性方程求解的困难.构造非线性偏微分方程的Hirota双线性形式,利用Hirota双线性方法得到方程的Lump解.通过绘图分析了它们的动力学行为.

关键词： Hirota双线性形式可积方程 Lump解符号计算

Dynamics of firing patterns,synchronization and resonances in neuronal electrical activities:experiments and analysis

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Acta Mechanica Sinica 2008年第6期24卷 593-628页

作者： Qishao Lu Huaguang Gu Zhuoqin Yang Xia Shi Lixia Duan yanhong zheng School of Science. Beihang University 100191 Beijing China School of Science Beijing University of Posts and Telecommunications 100876 Beijing China College of Science. North China University of Technology 100144 Beijing China School of Mathematics and Computer Science Fujian Normal University Fuzhou 350007. China

Recent advances in the experimental and theoretical study of dynamics of neuronal electrical firing activities are reviewed. Firstly, some experimental phenomena of neuronal irregular firing patterns, especially chaotic and stochastic firing patterns, are presented, and practical nonlinear time analysis methods are introduced to distinguish deterministic and stochastic mechanism in time series. Secondly, the dynamics of electrical firing activities in a single neuron is concerned, namely, fast-slow dynamics analysis for classification and mechanism of various bursting patterns, one- or two-parameter bifurcation analysis for transitions of firing patterns, and stochastic dynamics of firing activities （stochastic and coherence resonances, integer multiple and other firing patterns induced by noise, etc.）. Thirdly, different types of synchronization of coupled neurons with electrical and chemical synapses are discussed. As noise and time delay are inevitable in nervous systems, it is found that noise and time delay may induce or enhance synchronization and change firing patterns of coupled neurons. Noise-induced resonance and spatiotemporal patterns in coupled neuronal networks are also demonstrated. Finally, some prospects are presented for future research. In consequence, the idea and methods of nonlinear dynamics are of great significance in exploration of dynamic processes and physiological functions of nervous systems.

关键词： Neuron Firing patterns Synchronization Resonance Noise

A comparative study of n-alkane biomarker and pollen records: an example from southern China

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Chinese Science Bulletin 2009年第6期54卷 1065-1072页

作者： zheng yanhong ZHOU WeiJian XIE ShuCheng YU XueFeng State Key Laboratory of Continental Dynamics Department of Geology Northwest University Xi'an 710069 China State Key Laboratory of Loess and Quaternary Geology Institute of Earth Environment Chinese Academy of Sciences Xi'an 710075 China Key Laboratory of Biogeology and Environment Geology of Ministry of Education China University of Geosciences Wuhan 430074 China

We report the results of a comparative study of n-alkane biomarkers and pollens in lacustrine and peat deposits at Dingnan, Jiangxi Province in southern China, and discuss the likely causes for the dis-crepancy in the interpretations of the n-alkane biomarker and pollen records in terms of climate and vegetation change. The results show that past changes in climate and vegetation revealed by the n-alkane record are not always consistent with the pollen assemblage record in the whole section. Biomarkers do not permit direct identification of the plant family and/or genus and mainly record compositions of local plant remains, while pollens mainly reflect the regional vegetation change. Bio-markers and pollen records complement each other, providing a better picture of local and regional environments. Furthermore, biomarkers are more sensitive than pollen to climatic and vegetational change. Several climatic events are clearly identified by the n-alkane biomarker proxies, such as C31/(C27+C29+C 31) ratio and can be correlated to the North Atlantic Heinrich event, B/A, YD and two dry-cool events during the early Holocene such as the periods of 9850 to 9585 cal a B.P. and 8590 to 7920 cal a B.P. These events are consistent with those found in the surrounding regions, suggesting that the regional climate was coupled with global-scale abrupt climatic events. Our results suggest that biomarker and pollen data can record the more detailed climate and vegetation information, thus im-proving the resolution and precision of vegetation and climate reconstruction.

关键词：烷烃生物标志物花粉记录华南地区植被变化气候条件个例气候事件孢粉组合