Chaos, Solitons and Fractals: X最新文献_第7页

Exact propagating wave solutions in reaction cross-diffusion system 反应交叉扩散系统的精确传播波解

Chaos, Solitons and Fractals: X Pub Date : 2020-03-01 DOI: 10.1016/j.csfx.2020.100049

Abdullah Aldurayhim , Vadim N. Biktashev

引用次数: 0

Topic reading dynamics of the Chinese Sina-Microblog 中文新浪微博的话题阅读动态

Chaos, Solitons and Fractals: X Pub Date : 2020-03-01 DOI: 10.1016/j.csfx.2020.100031

Fulian Yin , Jiale Wu , Xueying Shao , Jianhong Wu

{"title":"Topic reading dynamics of the Chinese Sina-Microblog","authors":"Fulian Yin , Jiale Wu , Xueying Shao , Jianhong Wu","doi":"10.1016/j.csfx.2020.100031","DOIUrl":"10.1016/j.csfx.2020.100031","url":null,"abstract":"<div><p>A topic in the Sina-Microblog consists of multiple Weibos sharing a specific set of key words. Therefore, a reader of a Weibo may be susceptible to other Weibos of the same topic, and hence may undergo multiple transitions between the susceptible and the exposed states before eventually becoming infectious. This complicates the reading dynamics that traditional epidemic susceptible-exposed-infectious compartmental models cannot capture, and requires a different setting than a single Weibo forwarding dynamics model. Here we formulate a topic reading dynamics model; introduce some summative indices characterizing the reading “outbreak” potential; derive analytic formulae to calculate these indices; and examine the sensitivity of these indices and the ability of prediction on model parameters and on sampling frequencies. We conduct some numerical experiments based on historical data of popular reading topics in the Chinese Sina-Microblog. In our experiments, different sampling frequencies (4 h, 8 h or 12 h) nearcasting the turning points are feasible, in particular, a good nearcasting prediction for the accumulated R-users are 72 h with the sampling frequencies of every 4 h and every 12 h and 78 h with the sampling frequency of every 8 h.</p></div>","PeriodicalId":37147,"journal":{"name":"Chaos, Solitons and Fractals: X","volume":"5 ","pages":"Article 100031"},"PeriodicalIF":0.0,"publicationDate":"2020-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.csfx.2020.100031","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"95184501","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

The interplay between physical activity and aging in locomotor fractal behavior 运动分形行为中体力活动与衰老的相互作用

Chaos, Solitons and Fractals: X Pub Date : 2020-03-01 DOI: 10.1016/j.csfx.2020.100045

Scott W. Ducharme , Richard E.A. van Emmerik

{"title":"The interplay between physical activity and aging in locomotor fractal behavior","authors":"Scott W. Ducharme , Richard E.A. van Emmerik","doi":"10.1016/j.csfx.2020.100045","DOIUrl":"10.1016/j.csfx.2020.100045","url":null,"abstract":"<div><p>The complex organization of gait variability, or fractal dynamics, theoretically represents the adaptive capacity of the locomotor system. Prior studies suggest that fractal dynamics are sensitive to various individual constraints (e.g., age, neurological disease) and task constraints (e.g., walking speed or novel gait tasks). The purpose of this study was to determine if physical activity levels represent an additional individual constraint during walking. Fifteen young and 15 older adults walked on a treadmill at their preferred walking speed and at half of their preferred speed. Detrended fluctuation analysis was used to estimate the statistical persistence of stride time variability. Volume of physical activity was determined using a wearable monitor for 3-7 days. Habitual physical activity levels did not appear to have an effect on the fractal nature of stride-to-stride fluctuations in young adults. However, the least active older adults displayed higher scaling exponents compared to the more active older adults during slow walking. That is, less active older adults responded to the slow walking task by increasing fractal scaling, suggesting this task is more challenging and complex. These findings suggest that lower levels of habitual physical activity may represent an additional individual constraint in older but not young adults. When age and physical activity constraints are combined with a challenging slow walking task, the locomotor system of older adults may be more highly taxed, ultimately manifesting as stronger statistical persistence.</p></div>","PeriodicalId":37147,"journal":{"name":"Chaos, Solitons and Fractals: X","volume":"5 ","pages":"Article 100045"},"PeriodicalIF":0.0,"publicationDate":"2020-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.csfx.2020.100045","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"104670342","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Distinguished correlation properties of Chebyshev dynamical systems and their generalisations 切比雪夫动力系统的显著相关性质及其推广

Chaos, Solitons and Fractals: X Pub Date : 2020-03-01 DOI: 10.1016/j.csfx.2020.100035

Jin Yan, Christian Beck

引用次数: 4

Comment on “Estimation of COVID-19 dynamics “on a back-of-envelope”: Does the simplest SIR model provide quantitative parameters and predictions?” 评论“最简单的SIR模型能提供定量参数和预测吗?”

Chaos, Solitons and Fractals: X Pub Date : 2020-03-01 DOI: 10.1016/j.csfx.2020.100047

S. Rojas

引用次数: 2

Hyers-Ulam stability and existence of solutions for weighted Caputo-Fabrizio fractional differential equations 加权Caputo-Fabrizio分数阶微分方程的Hyers-Ulam稳定性和解的存在性

Chaos, Solitons and Fractals: X Pub Date : 2020-03-01 DOI: 10.1016/j.csfx.2020.100040

Xia Wu, Fulai Chen, Sufang Deng

引用次数: 3

Some fractal thoughts about the COVID-19 infection outbreak 关于COVID-19感染爆发的一些分形思考

Chaos, Solitons and Fractals: X Pub Date : 2019-12-01 DOI: 10.1016/j.csfx.2020.100032

Massimo Materassi

引用次数: 14

WITHDRAWN: Adaptive chaotic maps and their application to pseudo-random numbers generation 摘自:自适应混沌映射及其在伪随机数生成中的应用

Chaos, Solitons and Fractals: X Pub Date : 2019-12-01 DOI: 10.1016/j.csfx.2019.100018

A. Tutueva, E. Nepomuceno, A. Karimov, V. Andreev, D. Butusov

引用次数: 17

Hopf bifurcation in three-dimensional based on chaos entanglement function 基于混沌纠缠函数的三维Hopf分岔

Chaos, Solitons and Fractals: X Pub Date : 2019-12-01 DOI: 10.1016/j.csfx.2020.100027

Kutorzi Edwin Yao, Yufeng Shi

{"title":"Hopf bifurcation in three-dimensional based on chaos entanglement function","authors":"Kutorzi Edwin Yao, Yufeng Shi","doi":"10.1016/j.csfx.2020.100027","DOIUrl":"10.1016/j.csfx.2020.100027","url":null,"abstract":"<div><p>Chaotic entanglement is a new method used to deliver chaotic physical process, as suggested in this work. Primary rationale is to entangle more than two mathematical product stationery linear schemes by means of entanglement functions to make a chaotic system that develops in a chaotic manner.Existence of Hopf bifurcation is looked into by selecting the set aside bifurcation parameter. More accurately, we consider the stableness and bifurcations of sense of equilibrium in the modern chaotic system. In addition, there is involvement of chaos in mathematical systems that have one positive Lyapunov exponent. Furthermore, there are four requirements that are needed to achieve chaos entanglement. In that way through dissimilar linear schemes and dissimilar entanglement functions, a collection of fresh chaotic attractors has been created and abundant coordination compound dynamics are exhibited. The breakthrough suggests that it is not difficult any longer to construct new obviously planned chaotic systems/networks for applied science practical application such as chaos-based secure communication.</p></div>","PeriodicalId":37147,"journal":{"name":"Chaos, Solitons and Fractals: X","volume":"4 ","pages":"Article 100027"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.csfx.2020.100027","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134609822","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

A self-perturbed pseudo-random sequence generator based on hyperchaos 基于超混沌的自摄伪随机序列发生器

Chaos, Solitons and Fractals: X Pub Date : 2019-12-01 DOI: 10.1016/j.csfx.2020.100023

Zhao Yi , Gao Changyuan , Liu Jie , Dong Shaozeng

引用次数: 34