Dynamics (Pembroke, Ont.)最新文献_第5页

Beyond the Light-Cone Propagation of Relativistic Wavefunctions: Numerical Results 相对论波函数的超光锥传播:数值结果

Dynamics (Pembroke, Ont.) Pub Date : 2022-12-16 DOI: 10.3390/dynamics3010005

Xabier Gutierrez de la Cal, A. Matzkin

引用次数: 1

Asymmetric Interactions Induce Bistability and Switching Behavior in Models of Collective Motion 非对称相互作用诱导集体运动模型中的双稳态和切换行为

Dynamics (Pembroke, Ont.) Pub Date : 2022-12-16 DOI: 10.3390/dynamics2040027

D. Strömbom, Grace Tulevech, R. Giunta, Zachary Cullen

{"title":"Asymmetric Interactions Induce Bistability and Switching Behavior in Models of Collective Motion","authors":"D. Strömbom, Grace Tulevech, R. Giunta, Zachary Cullen","doi":"10.3390/dynamics2040027","DOIUrl":"https://doi.org/10.3390/dynamics2040027","url":null,"abstract":"Moving animal groups often spontaneously change their group structure and dynamics, but standard models used to explain collective motion in animal groups are typically unable to generate changes of this type. Recently, a model based on attraction, repulsion and asymmetric interactions designed for specific fish experiments was shown capable of producing such changes. However, the origin of the model’s ability to generate them, and the range of this capacity, remains unknown. Here we modify and extend this model to address these questions. We establish that its ability to generate groups exhibiting changes depends on the size of the blind zone parameter β. Specifically, we show that for small β swarms and mills are generated, for larger β polarized groups forms, and for a region of intermediate β values there is a bistability region where continuous switching between milling and polarized groups occurs. We also show that the location of the bistability region depends on group size and the relative strength of velocity alignment when this interaction is added to the model. These findings may contribute to advance the use of self-propelled particle models to explain a range of disruptive phenomena previously thought to be beyond the capabilities of such models.","PeriodicalId":80276,"journal":{"name":"Dynamics (Pembroke, Ont.)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86673765","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Cyclical Trends of Network Load Fluctuations in Traffic Jamming 交通阻塞中网络负荷波动的周期性趋势

Dynamics (Pembroke, Ont.) Pub Date : 2022-12-07 DOI: 10.3390/dynamics2040026

B. Tadić

{"title":"Cyclical Trends of Network Load Fluctuations in Traffic Jamming","authors":"B. Tadić","doi":"10.3390/dynamics2040026","DOIUrl":"https://doi.org/10.3390/dynamics2040026","url":null,"abstract":"The transport of information packets in complex networks is a prototype system for the study of traffic jamming, a nonlinear dynamic phenomenon that arises with increased traffic load and limited network capacity. The underlying mathematical framework helps to reveal how the macroscopic jams build-up from microscopic dynamics, depending on the posting rate, navigation rules, and network structure. We investigate the time series of traffic loads before congestion occurs on two networks with structures that support efficient transport at low traffic or higher traffic density, respectively. Each node has a fixed finite queue length and uses next-nearest-neighbour search to navigate the packets toward their destination nodes and the LIFO queueing rule. We find that when approaching the respective congestion thresholds in these networks, the traffic load fluctuations show a similar temporal pattern; it is described by dominant cyclical trends with multifractal features and the broadening of the singularity spectrum regarding small-scale fluctuations. The long-range correlations captured by the power spectra show a power-law decay with network-dependent exponents. Meanwhile, the short-range correlations dominate at the onset of congestion. These findings reveal inherent characteristics of traffic jams inferred from traffic load time series as warning signs of congestion, complementing statistical indicators such as increased travel time and prolonged queuing in different transportation networks.","PeriodicalId":80276,"journal":{"name":"Dynamics (Pembroke, Ont.)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84063141","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Inconsistencies in Modeling Impact with Friction by Algebraic Equations 用代数方程模拟含摩擦冲击的不一致性

Dynamics (Pembroke, Ont.) Pub Date : 2022-11-28 DOI: 10.3390/dynamics2040025

H. Baruh

引用次数: 0

Operatorial Formulation of a Model of Spatially Distributed Competing Populations 空间分布竞争种群模型的操作公式

Dynamics (Pembroke, Ont.) Pub Date : 2022-11-21 DOI: 10.3390/dynamics2040024

Guglielmo Inferrera, F. Oliveri

引用次数: 0

On the Hybrid Normal Distribution and Its Application in Fiber Data on the Strength of Glass 混杂正态分布及其在玻璃纤维强度数据中的应用

Dynamics (Pembroke, Ont.) Pub Date : 2022-11-18 DOI: 10.3390/dynamics2040023

D. S. Shibu, Soman Latha Nitin, C. Chesneau, M. Irshad, Sobhanam Padmini Shibin, R. Maya

引用次数: 0

On The Use of a Non-Constant Non-Affine or Slip Parameter in Polymer Rheology Constitutive Modeling 非恒定非仿射或滑移参数在聚合物流变本构建模中的应用

Dynamics (Pembroke, Ont.) Pub Date : 2022-10-29 DOI: 10.3390/dynamics2040022

Vasileios-Martin Nikiforidis, D. Tsalikis, Pavlos S. Stephanou

引用次数: 1

Influence of the Dufour Effect on Shear Thermal Diffusion Flows 杜福尔效应对剪切热扩散流动的影响

Dynamics (Pembroke, Ont.) Pub Date : 2022-10-24 DOI: 10.3390/dynamics2040021

N. Burmasheva, E. Prosviryakov

引用次数: 1

Baseline Electroencephalogram and Its Evolution after Activation of Dopaminergic System by Apomorphine in Middle-Aged 5XFAD Transgenic Mice, a Model of Alzheimer’s Disease 阿波啡激活老年痴呆模型5XFAD转基因小鼠多巴胺能系统后的基线脑电图及其演化

Dynamics (Pembroke, Ont.) Pub Date : 2022-10-14 DOI: 10.3390/dynamics2040020

V. Vorobyov, Alexander Deev, Zoya Oganesyan, F. Sengpiel, A. Ustyugov

{"title":"Baseline Electroencephalogram and Its Evolution after Activation of Dopaminergic System by Apomorphine in Middle-Aged 5XFAD Transgenic Mice, a Model of Alzheimer’s Disease","authors":"V. Vorobyov, Alexander Deev, Zoya Oganesyan, F. Sengpiel, A. Ustyugov","doi":"10.3390/dynamics2040020","DOIUrl":"https://doi.org/10.3390/dynamics2040020","url":null,"abstract":"Aging and Alzheimer’s disease (AD) are characterized by common pathological features associated with alterations in neuronal connections. These inevitably affect the functioning of specific brain areas and their interrelations, leading to questions about neuronal plasticity and the compensatory mechanisms associated with dopaminergic (DA) mediation. In this study on twelve-month-old freely moving 5XFAD-transgenic mice, serving as a model of AD, and their wild-type (WT) littermates, we analyze electroencephalograms (EEGs) from the motor cortex (MC), putamen (Pt) and the DA-producing ventral tegmental area (VTA) and substantia nigra (SN). Baseline EEGs in the transgenic mice were characterized by delta 2 activity enhancements in VTA and alpha attenuation in VTA and SN. In contrast to WT mice, which lack differences in EEG from these brain areas, 5XFAD mice showed theta–alpha attenuation and delta 2 and beta 2 enhancements in EEG from both VTA and SN vs. MC. In 5XFAD mice, a DA mimetic, apomorphine, lowered (vs. saline) the theta oscillations in Pt, VTA and SN and enhanced alpha in MC, Pt, VTA and beta 1 in all brain areas. These results and those obtained earlier in younger (six-month-old) mice suggest that the age-related characteristics of cerebral adaptive mechanisms affected by AD might be associated with modification of dopaminergic mediation in the mechanisms of intracerebral dynamic interrelations between different brain areas.","PeriodicalId":80276,"journal":{"name":"Dynamics (Pembroke, Ont.)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73925364","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Effect of Channel Roughness on Micro-Droplet Distribution in Internal Minimum Quantity Lubrication 内部最小量润滑中通道粗糙度对微液滴分布的影响

Dynamics (Pembroke, Ont.) Pub Date : 2022-10-14 DOI: 10.3390/dynamics2040019

Michael Craig, J. Raval, Bruce Tai, A. Patterson, W. Hung

引用次数: 0