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国际低碳旅游研究态势--基于Web of Science的文献计量分析

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浙江体育科学 2024年第4期46卷 38-46页

作者：胡俊展铉己曲阜师范大学体育科学学院山东曲阜273165

研究目的:低碳旅游的良性渐进发展为全球旅游业的可持续发展提供了借鉴经验,近年来已成为旅游领域的热点议题。研究方法:基于Web of Science(WOS)核心合集数据库,运用Bibliometrix文献计量软件总结2000-2023年国际低碳旅游研究领域的发... 详细信息

研究目的:低碳旅游的良性渐进发展为全球旅游业的可持续发展提供了借鉴经验,近年来已成为旅游领域的热点议题。研究方法:基于Web of Science(WOS)核心合集数据库,运用Bibliometrix文献计量软件总结2000-2023年国际低碳旅游研究领域的发展概况与主题1演变趋势,并对近6年(2018-2023年)的热点主题进行分析。研究结果:①低碳旅游研究数量显著增加,学术关注度不断升高,可分为芽发展期(2000-2007年)、初步发展期(2008-2013年)、波动发展期(2014-2017年)、快速发展期(2018-2023年)四个研究阶段,并且在近6年呈现出提质发展的研究态势;②发达国家是国际低碳旅游领域的研究主力,而中国是此领域研究中发挥重要作用的唯一发展中国家;③国际低碳旅游研究主题具有多元化的发展趋势,尤其是进入快速发展阶段以来,研究主题逐步国际环保热点相衔接;④近6年国际低碳旅游的热点主题包括影响、旅游、气候变化以及二氧化碳排放。研究启示:①重视低碳旅游在推动旅游业可持续发展进程中的重要意义;②采取针对性措施充分发挥低碳旅游的经济与生态效益;③创新性探索低碳旅游发展的技术路径;④推动传统旅游地实现低碳、绿色化转型。

关键词：低碳旅游可持续发展文献计量

CoNi基合金力学行为与变形机制的原位探究

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材料热处理学报 2024年第6期45卷 53-61页

作者：张展瑄陈新钰马天佑张强于开元中国石油大学(北京)新能源与材料学院北京102249

采用真空电弧熔炼、高温锻造及室温拔丝技术制备了Co_(62)Ni_(38)与Cr_(8)Co_(62)Ni_(30)(原子百分比)两种合金丝材。利用拉伸实验表征了两种合金的力学行为,利用穿透式广角X射线衍射技术原位追踪了合金变形过程中晶格参数与相结构演变... 详细信息

采用真空电弧熔炼、高温锻造及室温拔丝技术制备了Co_(62)Ni_(38)与Cr_(8)Co_(62)Ni_(30)(原子百分比)两种合金丝材。利用拉伸实验表征了两种合金的力学行为,利用穿透式广角X射线衍射技术原位追踪了合金变形过程中晶格参数与相结构演变。随后根据原位X射线衍射数据计算了两种合金的层错能与相变自由能,并与力学行为及变形机制建立联系。结果表明,Cr元素添加使合金屈服强度、抗拉强度、均匀伸长率及加工硬化率同时提升。原位X射线衍射结果表明Co_(62)Ni_(38)合金变形过程中未发生相变,Cr_(8)Co_(62)Ni_(3)0合金变形过程中发生应力诱发马氏体相变,且Cr_(8)Co_(62)Ni_(3)0合金层错能相比Co_(62)Ni_(38)合金下降约18%,相变自由能下降约42%。综上,Cr元素添加产生了固溶强化效应,有效降低了合金的层错能与相变自由能,促进应力诱发相变,使加工硬化率显著提高,从而明显改善合金的力学性能。

关键词： CoNi合金力学行为原位X射线衍射堆垛层错能应力诱发马氏体相变

Synchronization transition of a modular neural network containing subnetworks of different scales

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Frontiers of Information Technology & Electronic Engineering 2023年第10期24卷 1458-1470页

作者： Weifang HUANG Lijian YANG xuan zhan Ziying FU Ya JIA College of Physics Science and Technology Central China Normal UniversityWuhan 430079China School of Life Sciences Central China Normal UniversityWuhan 430079China

Time delay and coupling strength are important factors that affect the synchronization of neural *** this study,a modular neural network containing subnetworks of different scales was constructed using the Hodgkin–Huxley(HH)neural model;i.e.,a small-scale random network was unidirectionally connected to a large-scale small-world network through chemical *** delays were found to induce multiple synchronization transitions in the *** increase in coupling strength also promoted synchronization of the network when the time delay was an integer multiple of the firing period of a single *** that time delays at different locations in a modular network may have different effects,we explored the influence of time delays within each subnetwork and between two subnetworks on the synchronization of modular *** found that when the subnetworks were well synchronized internally,an increase in the time delay within both subnetworks induced multiple synchronization transitions of their *** addition,the synchronization state of the small-scale network affected the synchronization of the large-scale *** was surprising to find that an increase in the time delay between the two subnetworks caused the synchronization factor of the modular network to vary periodically,but it had essentially no effect on the synchronization within the receiving *** analyzing the phase difference between the two subnetworks,we found that the mechanism of the periodic variation of the synchronization factor of the modular network was the periodic variation of the phase ***,the generality of the results was demonstrated by investigating modular networks at different scales.

关键词： Hodgkin-Huxley neuron Modular neural network Subnetwork Synchronization Transmission delay

Energy dependence on modes of electric activities of neuron driven by different external mixed signals under electromagnetic induction

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Science China(Technological Sciences) 2019年第3期62卷 427-440页

作者： LU LuLu JIA Ya XU Ying GE MengYan YANG LiJian zhan xuan Institute of Biophysics and Department of Physics Central China Normal University

Energy supply and release play an important role in individual neuron and neural network. In this paper, the electrical activities and Hamilton energy of neuron are investigated when external mixed signals(i.e., the periodic stimulus current and the periodic electromagnetic field) are imposed on the neuron under the electromagnetic induction. As a result, the Hamilton energy is much dependent on the mode transition, the multiple electric activity modes and the numerical analysis of Hamilton energy are more complicated under various parameters. When the periodic high-low frequency electromagnetic radiation is imposed in neuron, it is found that the electrical activities are more complex, and the changing of energy is obvious. In addition, the response of electrical activity and Hamilton energy is much dependent on the changing of amplitude A, B when the external high-low frequency signal is imposed on the neuron, meanwhile, the energy of bursting state is lower than the one of spiking state. It can be used for investigation about the energy coding in the neuron even the neuron networks.

关键词： Hamilton energy electromagnetic induction electric activity multiple growing modes

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pH值对BiOCl光催化性能的影响

太原科技大学学报 2024年第1期45卷 97-100页

作者：刘辉张展瑄刘子豪武婕王艳太原科技大学化学与生物工程学院太原030021

以Bi(NO_(3))_(3)·5H_(2)O和KCl为原料,无水乙醇为溶剂,采用简单水热法在150℃、18 h条件下,通过浓氨水调节不同pH值制备出具有片状结构的光催化剂BiOCl.利用XRD、SEM、DRS等分析手段表征了样品,并以氙灯为光源,甲基橙(MO)为降解物,测... 详细信息

以Bi(NO_(3))_(3)·5H_(2)O和KCl为原料,无水乙醇为溶剂,采用简单水热法在150℃、18 h条件下,通过浓氨水调节不同pH值制备出具有片状结构的光催化剂BiOCl.利用XRD、SEM、DRS等分析手段表征了样品,并以氙灯为光源,甲基橙(MO)为降解物,测试了不同pH条件下样品的光催化活性,结果表明:不同pH值对合成样品的物相、形貌、禁带宽度和光催化性能影响较大,在pH=7时合成的BiOCl光催化效果最佳,在60 min内对甲基橙降解率达到了97.47%,降解反应表现为一级动力学。

关键词： BiOCl pH值水热法光催化性能

The complexity of climate reconstructions using the coexistence approach on Qinghai-Tibetan Plateau

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Journal of Palaeogeography 2019年第1期8卷 68-77页

作者： Zhi-Yong zhang Dong-Mei Cheng Cheng-Sen Li Wan Hu xuan-Huai zhan Hong-Li Ji Lushan Botanical Garden Jiangxi Province and Chinese Academy of Sciences State Key Laboratory of Systematic and Evolutionary Botany Institute of Botany Chinese Academy of Sciences

Quantifying the palaeoclimates of Qinghai–Tibetan Plateau is vital for understanding the uplift history of plateau and the evolution of Asian monsoon since Cenozoic. Recently, the Coexistence Approach(CA) has been employed to reconstruct the palaeoelevation and palaeoclimate of the plateau by several studies. However, the application of CA in mountainous areas and the realism of climate reconstructions via this method are seldom discussed,although the complexity of reconstructions is speculated. Here we reevaluated the realism of climate reconstruction using the CA with modern pollen samples from the Qinghai–Tibetan Plateau, and try to explore the possible factors influencing the precipitation and temperature reconstructions by CA. We suggest that the long-distance transport pollen as a result of the Asian summer monsoon potentially significantly affects the reconstructions both for precipitation and temperature. The precipitation complexly interacting with snowmelt and permafrost thaw leads to the discrepancy between the reconstructed precipitation and the real value. The response temperature for blossoming of dwarfed plants on the plateau is mostly likely higher than the air temperature(usually measured at1.5 m above ground) due to energy flux or morphological adaptation of inflorescences during the growing season,causing the distortion of temperature reconstructions. Precipitation reconstruction is notoriously difficult as the establishers of CA have already suggested, but reconstructing the low temperatures may be even more challenging on Qinghai–Tibetan Plateau. Though all of the explorations in current paper are in a qualitative way, it offers an inspiration of how appropriately interpret the disagreements between CA results and the observations, and of how to obtain a reasonable reconstruction of palaeoclimate of the plateau.

关键词： Complexity Climate reconstruction Coexistence approach Modern pollen assemblages Qinghai-Tibetan Plateau

Regioselective umpolung addition of dicyanobenzene to α,β-unsaturated alkenes enabled by electrochemical reduction

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Organic Chemistry Frontiers 2022年第5期9卷 1261-1266页

作者： Sheng zhang Wenchao Gao Jianxue Shi Jingjing Li Fengyi Li Yating Liang xuan zhan Man-Bo Li Institute of Physical Science and Information Technology Anhui UniversityHefeiAnhui 230601China College of Chemistry and Pharmaceutical Engineering Nanyang Normal UniversityNanyangChina

An umpolung addition of dicyanobenzene toα,β-unsaturated alkenes has been developed using an elec-troreductive *** electrochemical protocol is well compatible with a broad range of convention-ally challenging substrates,includingα,β-unsaturated esters,nitriles and trisubstituted ***,good to excellent regioselectivities are observed in the reaction of cinnamates with *** utility of this electrochemical approach is further demonstrated by direct late-stage functionali-zation of(S)-verbenone and 16-dehydropregnenolone acetate.

关键词： unsaturated benzene electrochemical

Risk Factors, Clinical Features and Prognosis for Subtypes of Ischemic Stroke in a Chinese Population

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Current Medical Science 2018年第2期38卷 296-303页

作者： Ya-fu TAN Li-xuan zhan Xiao-hui CHEN Jian-jun QUO Chao QIN En XU Department of Neurology the First Affiliated Hospital of Guangxi Medical University Nanning 530021 China Institute of Neurosciences and Department of Neurology the Seeond Affiliated Hospital of Guangzhou Medical University Guangzhou 510260 China

It is unanimously accepted that stroke is a highly heterogeneous disorder. Different subtypes of ischemic stroke may have different risk factors, clinical features, and prognoses. The aim of this study was to evaluate the risk factors, clinical characteristics, and prognoses of different subtypes of ischemic stroke defined by the Trial of ORG10172 in Acute Stroke Treatment （TOAST） criteria. We prospectively analyzed the data from 530 consecutive patients who were admitted to our hospital with acute ischemic stroke within 7 days of stroke onset during the study period. Standardized data assessment was used and the cause of ischemic stroke was classified according to the TOAST criteria. Patients were followed up till 30 and 90 days after stroke onset. It was found that large-artery atherosclerosis was the most frequent etiology of stroke （37.4%）, and showed the highest male preponderance, the highest prevalence of previous transient ischemic attack, and the longest hospital stay among all subtypes. Small artery disease （36.4%） was associated with higher body mass index, higher plasma triglycerides, and lower plasma high-density lipoprotein cholesterol than cardioembolism. Cardioembolism （7.7%）, which was particularly common in the elderly （i.e., individuals aged 65 years and older）, showed the highest female preponderance, the highest prevalence of atrial fibrillation, the earliest presentation to hospital after stroke onset, the most severe symptoms on admission, the maximum complications associated with an adverse outcome, and the highest rate of stroke recurrence and mortality. Our results suggest that ischemic stroke should be regarded as a highly heterogeneous disorder. Studies involving risk factors, clinical features, and prognoses of ischemic stroke should differentiate between etiologic stroke subtypes.

关键词： ischemic stroke stroke classification stroke subtypes risk factors clinical features outcome

Preparation and combustion properties of laminated sticks of B-CuO and B-Bi2O3

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