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  • Influence of a political scandal on voting in a simple model
    Physica A (IF 2.924) Pub Date : 2020-08-06
    Michel Droz; Andrzej Pȩkalski

    A simple computer model describing the influence of a political scandal on a voting process in a two-party society, is presented. We discuss the role of three parameters charactering a scandal – its magnitude (volume of coverage in the media), time it occupies place in the media and the openness of the society. We show that the dependence of the magnitude of a scandal needed for the opposition to take

    更新日期:2020-08-06
  • Identification of healthy and pathological heartbeat dynamics based on ECG-waveform using multifractal spectrum
    Physica A (IF 2.924) Pub Date : 2020-08-06
    Xiaodong Yang; Zhixiao Wang; Aijun He; Jun Wang

    Human body surface electrocardiogram (ECG) is non-stationary and frequency-varying by nature that belongs to a typical nonlinear signal. Therefore, traditional linear and time-frequency analysis methods can not fully disclose its nonlinear nature. Meanwhile, physiological complexity of heartbeat signal may vary with age, diseases, drug administrations, or even behavioral modifiers. To test the intrinsic

    更新日期:2020-08-06
  • Comparison analysis on complex topological network models of urban rail transit: A case study of Shenzhen Metro in China
    Physica A (IF 2.924) Pub Date : 2020-08-06
    Yangyang Meng; Xiangliang Tian; Zhongwen Li; Wei Zhou; Zhijie Zhou; Maohua Zhong

    To study the topological complexity of urban rail transit (URT) networks with the multi-line transfer stations from different perspectives, Shenzhen Metro (SZM) is taken as an example and Space L & Space P models are established in this study. Then, based on multiple evaluation parameters and key nodes ranking, the differences of network topological complexity in two models are deeply explored and

    更新日期:2020-08-06
  • Clusters and the entropy in opinion dynamics on complex networks
    Physica A (IF 2.924) Pub Date : 2020-08-06
    Wenchen Han; Yuee Feng; Xiaolan Qian; Qihui Yang; Changwei Huang

    In this work, we investigate a heterogeneous population in the modified Hegselmann-Krause opinion model on complex networks. We introduce the Shannon information entropy about all relative opinion clusters to characterize the cluster profile in the final configuration. Independent of network structures, there exists the optimal stubbornness of one subpopulation for the largest number of clusters and

    更新日期:2020-08-06
  • Opinion attractiveness and its effect in opinion formation models
    Physica A (IF 2.924) Pub Date : 2020-08-06
    Mayte Pérez-Llanos; Juan Pablo Pinasco; Nicolas Saintier

    In this work we introduce the idea of fitness in the context of opinion dynamics. We obtain the hydrodynamic equations for a kinetic model including the attractiveness or strength of each opinion, and we find a conserved quantity which enable us to characterize the consensus opinion. We compare this model with other rules of interaction, and we show interesting differences on the asymptotic behavior

    更新日期:2020-08-06
  • Intelligent forecasting of inbound tourist arrivals by social networking analysis
    Physica A (IF 2.924) Pub Date : 2020-07-18
    Fong-Ching Yuan

    Tourism is very important for many countries. Many tourism demand forecasting methodologies are continuously being proposed. Most studies have used lagging economic factors as predictors, but these can cause an inaccurate prediction when unexpected events happen. In this study, a tourism social network will be used in our forecasting model. In addition, a least square support vector regression with

    更新日期:2020-08-05
  • Binary indices of time series complexity measures and entropy plane
    Physica A (IF 2.924) Pub Date : 2020-07-31
    Binbin Shang; Pengjian Shang

    Complexity of time series is an important feature of dynamical systems such as financial systems. In order to bring out the complete non-linear behavior of financial time series, non-linear tools of complexity measurement like entropy measures are indispensable. Sample entropy (SampEn) and distribution entropy (DistEn) are popular methods of assessing the complexity in various fields. However, both

    更新日期:2020-08-05
  • International investors and the multifractality property: Evidence from accessible and inaccessible market
    Physica A (IF 2.924) Pub Date : 2020-08-05
    Songsong Li; Nan Xu; Xiaofeng Hui

    This study provides the evidence that the transactions of international investors in the stock market exacerbate the degree of market multifractality. We analyze shares cross-listed in an accessible market (H-shares in Hong Kong) and an inaccessible market (A-shares in mainland China) by applying the method of multifractal detrended fluctuation analysis (MF-DFA) from 01 January 2010 to 31 December

    更新日期:2020-08-05
  • Google matrix analysis of bi-functional SIGNOR network of protein-protein interactions
    Physica A (IF 2.924) Pub Date : 2020-08-05
    Klaus M. Frahm; Dima L. Shepelyansky

    Directed protein networks with only a few thousand of nodes are rather complex and do not allow to extract easily the effective influence of one protein to another taking into account all indirect pathways via the global network. Furthermore, the different types of activation and inhibition actions between proteins provide a considerable challenge in the frame work of network analysis. At the same

    更新日期:2020-08-05
  • Ball and chain effect: Is Turkey’s growth rate constrained by current account deficit?
    Physica A (IF 2.924) Pub Date : 2020-07-30
    Mustafa Özer; Marko Malovic

    Persistent and unsustainable current account deficits imply continuous foreign borrowing. In this study, we investigate the causal relationship between Turkish current account deficits (CAD) and growth, by using both traditional Granger and Frequency Domain Causality Tests developed by Breitung and Candelon (BC hereafter) over the period of first quarter of 2002 to the first quarter of 2017, since

    更新日期:2020-08-04
  • Uncertainty relation for estimating the position of an electron in a uniform magnetic field from quantum estimation theory
    Physica A (IF 2.924) Pub Date : 2020-07-21
    Shin Funada; Jun Suzuki

    We investigate the uncertainty relation for estimating the position of one electron in a uniform magnetic field in the framework of the quantum estimation theory. Two kinds of momenta, canonical one and mechanical one, are used to generate a shift in the position of the electron. We first consider pure state models whose wave function is in the ground state with zero angular momentum. The model generated

    更新日期:2020-08-04
  • Interface evolution in phase transformations ruled by nucleation and growth
    Physica A (IF 2.924) Pub Date : 2020-07-28
    Massimo Tomellini

    An analytical model for the evolution of the boundary of the new phase in transformations ruled by nucleation and growth is presented. Both homogeneous and heterogeneous nucleation have been considered: The former includes transformations in 2D and 3D space and the latter nucleation and growth on flat solid substrate. The theory is formulated for the general case of spatially correlated nuclei, arbitrary

    更新日期:2020-08-04
  • An improved car-following model considering electronic throttle dynamics and delayed velocity difference
    Physica A (IF 2.924) Pub Date : 2020-08-01
    Shihao Li; Rongjun Cheng; Hongxia Ge

    With consideration of the effect of the electronic throttle dynamics, an improved car-following model is constructed in this paper. In the new model, the control signals including the opening angle difference of electronic throttle and the delayed velocity difference are introduced. Moreover, for the sake of confirming the impact of the electronic throttle opening angle difference and the delayed velocity

    更新日期:2020-08-04
  • Bypassing the truncation problem of truncated Lévy flights
    Physica A (IF 2.924) Pub Date : 2020-08-03
    Raul Matsushita; Sergio Da Silva; Regina Da Fonseca; Mateus Nagata

    We suggest a solution to the problem of truncation of truncated Lévy flights by deductively finding a power law between the truncation length and its standard deviation. We offer a generalization where the pdf of returns is left unknown, and its distributional moments are allowed to vary in time. Our model fits well with a financial dataset, which exhibits extreme moves.

    更新日期:2020-08-04
  • Multivariate cumulants in outlier detection for financial data analysis
    Physica A (IF 2.924) Pub Date : 2020-07-28
    Krzysztof Domino

    There are many research papers yielding the financial data models, where returns are tied either to the fundamental analysis or to the individual, often irrational, behaviour of investors. In the second case the bubble followed by the crisis is possible on the market. Such bubble or crisis is reflected by the cross-correlated extreme positive or negative returns of many assets. Such returns are modelled

    更新日期:2020-08-03
  • On the resistance distance and Kirchhoff index of a linear hexagonal (cylinder) chain
    Physica A (IF 2.924) Pub Date : 2020-07-31
    Sumin Huang; Shuchao Li

    The resistance between two nodes in some resistor networks has been studied extensively by mathematicians and physicists. Let Ln be a linear hexagonal chain with n 6-cycles. Then identifying the opposite lateral edges of Ln in an ordered way yields the linear hexagonal cylinder chain, written as Rn. We obtain explicit formulae for the resistance distance rLn(i,j) (resp. rRn(i,j)) between any two vertices

    更新日期:2020-08-03
  • Empirical study of financial crises based on topological data analysis
    Physica A (IF 2.924) Pub Date : 2020-07-22
    Hongfeng Guo; Shengxiang Xia; Qiguang An; Xin Zhang; Weihua Sun; Xinyao Zhao

    We analyze financial time series based on topological data analysis to obtain the critical information around 2008 global financial crisis and 2010 European debt crisis. We build an early warning system to detect the critical dates on the financial time series. By constructing complexes on the point clouds data with sliding windows, we explore their topological changes from window to window. The persistence

    更新日期:2020-08-03
  • Scale-free and small-world properties of a multiple-hub network with fractal structure
    Physica A (IF 2.924) Pub Date : 2020-07-31
    Yuke Huang; Hanxiong Zhang; Cheng Zeng; Yumei Xue

    In this paper, we introduce a new kind of multiple-hub network with fractal structure. We aim to present a study on some properties of this network, such as the box dimension of the adjacency matrix, degree distribution, average clustering coefficient and average path length, which show the scale-free and small-world effects of this network.

    更新日期:2020-08-03
  • Dynamic magnetic properties of the mixed spin (1/2, 3/2) Ising system in the presence of magnetic field within the path probability method
    Physica A (IF 2.924) Pub Date : 2020-08-03
    Mustafa Gençaslan; Mustafa Keskin

    The dynamic magnetic properties of the mixed spin (1/2, 3/2) Ising system with bilinear nearest-neighbor exchange interactions and a crystal-field term under the presence of the external longitudinal magnetic field (ELMF) are investigated by the path probability method. First we briefly examine the equilibrium magnetic properties of the system within the cluster variation method in order to clearly

    更新日期:2020-08-03
  • Uniform quantized electron gas: Radiation correction
    Physica A (IF 2.924) Pub Date : 2020-08-03
    Johan S. Høye; Enrique Lomba

    In this paper we analyze how radiation effects influence the correlation functions, the excess energy, and in turn the electron correlation energy of the quantized electron gas at temperature T=0. To that aim we resort to a statistical mechanical description of the quantum problem of electron correlations, based on the path integral formalism. In previous works we studied and found accurate results

    更新日期:2020-08-03
  • A discrete fractional-order Cournot duopoly game
    Physica A (IF 2.924) Pub Date : 2020-07-30
    Baogui Xin; Wei Peng; Yekyung Kwon

    This paper focuses on associating the Cournot duopoly problem with long-memory effects. First of all, we generate a discrete fractional-order Cournot duopoly game by introducing the Caputo fractional-order difference calculus to the classical duopoly theory. In the fractional-order game, participants can make their decisions by taking full advantage of their historical information. Then we discuss

    更新日期:2020-08-02
  • Dynamic rumor spreading of public opinion reversal on Weibo based on a two-stage SPNR model
    Physica A (IF 2.924) Pub Date : 2020-07-30
    Guoyin Jiang; Saipeng Li; Minglei Li

    Exploring the dynamic mechanism of rumor reversal in several public emergency events can support managers to control and guild the spread of public opinion. In this study a two-stage rumor model, namely, susceptible, positive, negative, and recovered state (SPNR) is built to analyze rumor spread and reversal of rumors regarding emergencies on Weibo. The model considers the hysteresis of official news

    更新日期:2020-08-02
  • The distribution of union size: Canada, 1913–2014
    Physica A (IF 2.924) Pub Date : 2020-07-31
    Michele Campolieti

    I study the size distribution of Canadian trade unions and whether it is consistent with power law (Pareto) or other heavy tailed distributions (the lognormal and stretched exponential), using data from selected years between 1913 and 2014. I assess the fit of these distributions and undertake some model comparison tests. I also discuss some mechanisms that could give rise to these distributions in

    更新日期:2020-08-02
  • Ordinary and extraordinary waves in hot nonextensive plasma
    Physica A (IF 2.924) Pub Date : 2020-07-28
    M. Sharifi; M.N. Nasrabadi

    In this paper, a kinetic method based on particle velocity distribution function in the context of the nonextensive Tsallis statistics is presented for ordinary and extraordinary waves in a collisionless magnetized hot plasma. The components of the generalized dielectric tensor for perpendicular propagation in hot nonextensive plasma are derived in terms of generalized hypergeometric functions. The

    更新日期:2020-08-02
  • Two-sided matching and strategic selection on freight resource sharing platforms
    Physica A (IF 2.924) Pub Date : 2020-08-01
    Zhihong Wang; Yangyang Li; Fu Gu; Jianfeng Guo; Xiaojun Wu

    To resolve problems of information asymmetry and low matching efficiency in freight market, a freight resource sharing platform must provide accurate and readily acceptable vehicle-cargo matching results. We study a two-sided matching model, and analyze the impact of suppliers and demanders’ loss aversion on matching results. We find that users’ loss aversion positively influences the accuracy of vehicle-cargo

    更新日期:2020-08-01
  • Exploring the behavioral risk chains of accidents using complex network theory in the construction industry
    Physica A (IF 2.924) Pub Date : 2020-08-01
    Shengyu Guo; Xinyu Zhou; Bing Tang; Peisong Gong

    Accident causation theories explain the possible causation mechanisms of accidents, and unsafe behavior is a major component of such causes. Considering the limitation that existing studies rarely discuss the interactions among unsafe behaviors in accidents, this paper uses a case study in the Chinese building construction industry to explore the behavioral risk chains of accidents based on complex

    更新日期:2020-08-01
  • Human wealth evolution: Trends and fluctuations
    Physica A (IF 2.924) Pub Date : 2020-07-29
    Paolo Sibani; Steen Rasmussen

    Is a causal description of human wealth history conceivable? To investigate the matter we introduce a simple causal albeit strongly aggregated model, assuming that the observed wealth growth is mainly driven by human collaborative efforts whose intensity itself increases with increasing wealth. As an empirical reference we use time series describing eight centuries of per capita annual gross domestic

    更新日期:2020-07-31
  • Rethinking critical node problem for railway networks from the perspective of turn-back operation
    Physica A (IF 2.924) Pub Date : 2020-07-22
    Hiroki Noguchi; Masaaki Fuse

    Vulnerability assessment studies addressing the critical node problem for railway networks do not recognize the importance of turn-back operations as a typical reaction to disruption. The aim of this study is to explore the significance of turn-back operations during the process of identifying critical stations. This significance was quantified by comparing the results of critical stations (both with

    更新日期:2020-07-29
  • Grand canonical description of equilibrium and non-equilibrium systems using spin formalism
    Physica A (IF 2.924) Pub Date : 2020-07-29
    Segun Goh; JunHyuk Woo; Jean-Yves Fortin; MooYoung Choi

    We consider an open system in contact with a reservoir, where particles as well as energies can be exchanged between them, and present a description of the dynamics in terms of mixed (pseudo)spin and state variables. Specifically, a master equation is constructed out of the exchange rates for particles and for energies, which allows us to probe the system in the grand canonical description. In particular

    更新日期:2020-07-29
  • Conditions for the existence of a generalization of Rényi divergence
    Physica A (IF 2.924) Pub Date : 2020-07-25
    Rui F. Vigelis; Luiza H.F. de Andrade; Charles C. Cavalcante

    We give necessary and sufficient conditions for the existence of a generalization of Rényi divergence, which is defined in terms of a deformed exponential function. If the underlying measure μ is non-atomic, we found that not all deformed exponential functions can be used in the generalization of Rényi divergence; a condition involving the deformed exponential function is provided. In the case μ is

    更新日期:2020-07-28
  • Comment on the paper “Microcanonical analysis of Boltzmann and Gibbs entropies in trapped cold atomic gases, K.J. Higginbotham, D.E. Sheehy, Physica A 536(2019) 122547”
    Physica A (IF 2.924) Pub Date : 2020-07-23
    Ji-Xuan Hou

    In the commented paper, the authors study a gas of noninteracting fermions confined in a one-dimensional harmonic trap, and calculate the Boltzmann temperature and the Gibbs temperature of this system. They find that the Gibbs temperature is closer to the corresponding temperature given by the grand-canonical approach than the Boltzmann temperature. In this comment we point out their conclusion is

    更新日期:2020-07-28
  • Newton equation and Schrödinger equation for the harmonic oscillator with probability distributions in frequency
    Physica A (IF 2.924) Pub Date : 2020-07-24
    Won Sang Chung; Hassan Hassanabadi; Jan Kr̆íz̆

    In this paper, we discuss Newton equation for the harmonic oscillator with probability distributions in frequency, where the frequency is a stochastic variable with a suitable probability distribution. A new type of Newton equation is obtained by taking the stochastic average of Newton equation with harmonic force with respect to the fluctuating frequency. This method is also applied to the Schrödinger

    更新日期:2020-07-28
  • Platform launch in two-sided markets and users’ expectations
    Physica A (IF 2.924) Pub Date : 2020-07-28
    Yang Geng; Yulin Zhang

    This paper analyzes the effect of users’ expectations on the dynamic process of users’ subscriptions based on the Bass model. We find that in all cases, the platform can make a successful launch if and only if the initial point is above the critical trajectory. If the probability that users on one side base their expectations on the number of subscribers on the same side is high, the launch of the

    更新日期:2020-07-28
  • Scholar’s career switch adhesive with research topics: An evidence from China
    Physica A (IF 2.924) Pub Date : 2020-07-28
    Yinghong Ma; Le Song; Zhaoxun Ji; Qian Wang; Qinglin Yu

    Despite persistent efforts in untangling the mechanism of scientists switching between research topics, little is investigated for the relationship of scholars’ career stage switch leading to dynamics of research topics. In this paper, aiming to reveal career stage and its influence on research topics, we construct a two-layer network model, coauthors collaboration network (α-layer) for scholars research

    更新日期:2020-07-28
  • Nonlinear kinetics of transition between transport flow modes
    Physica A (IF 2.924) Pub Date : 2020-07-28
    Alexei Khomenko; Alexey Shikura

    The kinetics of transition between free and jammed traffic flow is studied. The types of stability of stationary states with different functioning modes are examined. The mutually coordinated behavior of the deviations of headway and velocity from their optimal values and acceleration/braking time of cars is presented. The three-dimensional phase portraits of the kinetics of these nonequilibrium parameters

    更新日期:2020-07-28
  • Link prediction using node information on local paths
    Physica A (IF 2.924) Pub Date : 2020-07-28
    Furqan Aziz; Haji Gul; Ishtiaq Muhammad; Irfan Uddin

    Link prediction is one of the most important and challenging tasks in complex network analysis, which aims to predict missing link based on existing ones in a network. This problem is of both theoretical interest and has applications in diverse scientific disciplines, including social network analysis, recommendation systems, and biological networks. In this paper we propose a novel link prediction

    更新日期:2020-07-28
  • Thermodynamics of urban growth revealed by city scaling
    Physica A (IF 2.924) Pub Date : 2020-07-27
    Lorraine Sugar; Chris Kennedy

    Cities are complex systems, where micro-scale phenomena lead to emergent, macro-scale patterns. Scaling in cities—the study of how characteristics of cities change with urban population—has been explained based on social interactions and networks, but cities are also governed by the laws of physics, such as thermodynamics and conservation of mass. Here we explore scaling laws in the context of the

    更新日期:2020-07-27
  • Anomalous statistics of particle spreading in quenched random velocity field
    Physica A (IF 2.924) Pub Date : 2020-07-27
    M. Ghasemi Nezhadhaghighi

    We study the motion of a random walker in two dimensional randomly oriented Manhattan lattice where each horizontal and vertical link in a regular square lattice is assigned a random direction. This model describes the anomalous diffusion properties of the tracer particles that are driven by a random unidirectional zero mean velocity field. By means of numerical analysis and with the use of qth order

    更新日期:2020-07-27
  • On the statistical evolution of viscous vortex-gas free shear layers
    Physica A (IF 2.924) Pub Date : 2020-07-25
    S. Suryanarayanan; R. Narasimha

    The temporal vortex-gas free shear layer is a Hamiltonian system of N-point vortices in a singly-periodic domain relevant to the (large-scale) development of plane (3D Navier–Stokes) turbulent shear layers. It has been shown (Suryanarayanan et al., 2014) that there are three distinct temporal regimes in its evolution, including an intermediate self-similar regime (RII) with a universal constant spreading

    更新日期:2020-07-25
  • COVID-19 in Italy and extreme data mining
    Physica A (IF 2.924) Pub Date : 2020-07-25
    Paolo Massimo Buscema; Francesca Della Torre; Marco Breda; Giulia Massini; Enzo Grossi

    In this article we want to show the potential of an evolutionary algorithm called Topological Weighted Centroid (TWC). This algorithm can obtain new and relevant information from extremely limited and poor datasets. In a world dominated by the concept of big (fat?) data we want to show that it is possible, by necessity or choice, to work profitably even on small data. This peculiarity of the algorithm

    更新日期:2020-07-25
  • Stochastic approach to Fisher and Kolmogorov, Petrovskii, and Piskunov wave fronts for species with different diffusivities in dilute and concentrated solutions
    Physica A (IF 2.924) Pub Date : 2020-07-22
    Gabriel Morgado; Bogdan Nowakowski; Annie Lemarchand

    A wave front of Fisher and Kolmogorov, Petrovskii, and Piskunov type involving two species A and B with different diffusion coefficients DA and DB is studied using a master equation approach in dilute and concentrated solutions. Species A and B are supposed to be engaged in the autocatalytic reaction A+B → 2A. Contrary to the results of a deterministic description, the front speed deduced from the

    更新日期:2020-07-24
  • The critical two dimensional Ising model on right-triangle-shaped square lattices
    Physica A (IF 2.924) Pub Date : 2020-07-22
    Xintian Wu; Shenghong Sun

    Using the bond-propagation algorithm, we study the critical Ising model on the square lattice with the shape of right triangle and free boundaries. The length of short leg is N and that of long leg is M. The aspect ratio between the two legs ρ=M∕N is fixed. For six ratios: ρ=1,2,3,4,8,16, the critical free energy density, internal energy density and specific heat on the lattices with 30≤N≤600 are calculated

    更新日期:2020-07-24
  • Eigenvalues of Ising connection matrix with long-range interaction
    Physica A (IF 2.924) Pub Date : 2020-07-15
    L.B. Litinskii; B.V. Kryzhanovsky

    We examine multidimensional Ising systems on hypercube lattices and calculate analytically the eigenvalues of their connection matrices. We express the eigenvalues in terms of spin–spin​ interaction constants and the eigenvalues of the one-dimensional Ising connection matrix (the latter are well known). To do this we present the eigenvectors as Kronecker products of the eigenvectors of the one-dimensional

    更新日期:2020-07-24
  • Study on state feedback control strategy for car-following system
    Physica A (IF 2.924) Pub Date : 2020-07-21
    Tao Song; Wen-Xing Zhu

    A state feedback control strategy of modern control theory is proposed to analyze the classical car-following system. From the point of view of control theory, the influence of changing two important states velocity and headway on the stability of the car-following system is analyzed. The stability conditions of the control parameters are obtained by the conditions for roots of characteristic polynomials

    更新日期:2020-07-24
  • Influence of Stark-shift on quantum coherence and non-classical correlations for two two-level atoms interacting with a single-mode cavity field
    Physica A (IF 2.924) Pub Date : 2020-07-17
    Abdallah Slaoui; Ahmed Salah; Mohammed Daoud

    An exact analytic solution for two two-level atoms coupled with a multi-photon single-mode electromagnetic cavity field in the presence of the Stark shift is derived. We assume that the field is initially prepared in a coherent state and the two atoms are initially prepared in excited state. Considering the atomic level shifts generated by the Stark shift effect, the dynamical behavior of both quantum

    更新日期:2020-07-23
  • Exploring node importance evolution of weighted complex networks in urban rail transit
    Physica A (IF 2.924) Pub Date : 2020-07-14
    Yangyang Meng; Xiangliang Tian; Zhongwen Li; Wei Zhou; Zhijie Zhou; Maohua Zhong

    With the development of complex networks in urban rail transit (URT), the topological structure changes accordingly and node importance also redistributes dynamically. However, many deficiencies exist in the single measure or unweighted network or static network when ranking node importance. Most importantly, the evolution mechanism of node importance with the network development is seldom studied

    更新日期:2020-07-22
  • A robust train timetable optimization approach for reducing the number of waiting passengers in metro systems
    Physica A (IF 2.924) Pub Date : 2020-07-15
    Li Zhou; Xin Yang; Huan Wang; Jianjun Wu; Lei Chen; Haodong Yin; Yunchao Qu

    Timetable optimization in metro systems has been an active research topic for a long time. Traditional studies often ignore some uncertainties of passenger characteristics to simplify the model formulation and solution algorithm. In this paper, we present a robust optimization approach for the timetable optimization problem with consideration of the uncertainties of passenger arrival times and alighting

    更新日期:2020-07-21
  • Classical and statistical limits of the quantum singular oscillator
    Physica A (IF 2.924) Pub Date : 2020-07-16
    Caio Fernando e Silva; Alex E. Bernardini

    The classical boundaries of the quantum singular oscillator (SO) is addressed under Weyl–Wigner phase-space and Bohmian mechanics frameworks as to comparatively evaluate phase-space and configuration space quantum trajectories as well as to compute distorting quantum fluctuations. For an engendered pure state quasi-gaussian Wigner function that recovers the classical time evolution (at phase and configuration

    更新日期:2020-07-18
  • Classical lattice models with single-node interactions on hierarchical lattices: The two-layer Ising model
    Physica A (IF 2.924) Pub Date : 2020-07-12
    A.V. Myshlyavtsev; M.D. Myshlyavtseva; S.S. Akimenko

    A general approach is proposed for renormalization group transformations at arbitrary hierarchical lattices with two root nodes and the presence of single-node interactions (interactions between layers, magnetic field, chemical potential, etc.). The effectiveness of the proposed approach was shown for the two-layer Ising model in a zero magnetic field on the simplest representative of folded square

    更新日期:2020-07-16
  • Structural breaks and trend awareness-based interaction in crypto markets
    Physica A (IF 2.924) Pub Date : 2020-07-11
    Şahin Telli; Hongzhuan Chen

    This study aims to test multiple structural breaks using Bai-Perron methodology for the crypto markets. We analyze return and volatility (proxied by absolute and squared returns) series of Bitcoin and the following crypto assets: Bitcoin Cash, DASH, Ethereum, IOTA, Litecoin, NEO, XRP. In the analysis, we consider the BTC markets of those 7 altcoins as well as the USD markets. Empirical findings indicate

    更新日期:2020-07-16
  • Opinion dynamics with emergent collective memory: A society shaped by its own past
    Physica A (IF 2.924) Pub Date : 2020-07-08
    Gioia Boschi; Chiara Cammarota; Reimer Kühn

    In order to understand the development of common orientation of opinions in the modern world we propose a model of a society described as a large collection of agents that exchange their expressed opinions under the influence of their mutual interactions and external events. In particular we introduce an interaction bias which results in the emergence of a collective memory such that the society is

    更新日期:2020-07-16
  • Interparticle correlations in the simple cubic lattice of ferroparticles: Theory and computer simulations
    Physica A (IF 2.924) Pub Date : 2020-07-13
    Anna Yu. Solovyova; Andrey A. Kuznetsov; Ekaterina A. Elfimova

    Anisotropic interparticle correlations in the simple cubic lattice of single-domain ferroparticles (SCLF) are studied using both theory and computer simulation. The theory is based on the Helmholtz free energy expansion like classical virial series up to the second virial coefficient. The analytical formula for the Helmholtz free energy is incorporated in a logarithmic form to minimize the effects

    更新日期:2020-07-16
  • Governing equations for stress distribution in rhombic disk packings
    Physica A (IF 2.924) Pub Date : 2020-07-10
    Xinggang Zhang; Dan Dai

    The governing equations of stress tensor fields are significant to understand the mechanical behaviors of static granular matter. A multiscale method based on the algebra of translation operators is proposed to derive the governing equations of stress transmission in rhombic lattice packings of disks with friction. Except for the two well-known equations, i.e. the symmetry of stress tensor and the

    更新日期:2020-07-15
  • WLDAP: A computational model of weighted lncRNA-disease associations prediction
    Physica A (IF 2.924) Pub Date : 2020-07-09
    Guobo Xie; Lifeng Wu; Zhiyi Lin; Ji Cui

    Increasing evidence has demonstrated that long non-coding RNAs (lncRNAs) play essential roles in various human complex diseases. Compared with protein-coding genes, the associations between diseases and lncRNAs are still not well studied. Hence, inferring disease-associated lncRNAs on a genome-wide scale has become an urgent matter. However, known associations are still being studied in small quantities

    更新日期:2020-07-15
  • Revisiting Cornell potential model of the Quark–Gluon plasma
    Physica A (IF 2.924) Pub Date : 2020-07-13
    Prasanth J.P.; Sebastian Koothottil; Vishnu M. Bannur

    The equation of state (EoS) of Quark–Gluon plasma (QGP) is revisited with Mayer’s theory of plasma. We derived a semi-classical EoS of QGP including the contribution of quantum effects near the transition temperature Tc. The cluster expansion (CE) method allows us to take into account the interaction between the partons, i.e, Cornell potential. The results obtained within our approach agrees with the

    更新日期:2020-07-15
  • A coarse graining algorithm based on m-order degree in complex network
    Physica A (IF 2.924) Pub Date : 2020-07-02
    Qing-Lin Yang; Li-Fu Wang; Guo-Tao Zhao; Ge Guo

    The coarse-grained technology of complex networks is a promising method to analyze large-scale networks. Coarse-grained networks are required to preserve some properties of the original networks. In this paper, we propose an m-order-degree-based coarse graining (MDCG) algorithm to keep some statistical properties and controllability of the original network by merging the nodes with the same or similar

    更新日期:2020-07-13
  • Revealing dynamic communities in networks using genetic algorithm with merge and split operators
    Physica A (IF 2.924) Pub Date : 2020-07-04
    Weihua Zhan; Lei Deng; Jihong Guan; Jun Niu; Dechao Sun

    Community structures are pervasive in real-world networks, portraying the strong local clustering of nodes. Unveiling the community structure of a network is deemed to be a crucial step towards understanding its dynamics. Actually, most real-world networks are dynamic, and their community structures are evolving over time accordingly. How to reveal these dynamic communities has recently become a pressing

    更新日期:2020-07-10
  • Inequalities, chance and success in sport competitions: Simulations vs empirical data
    Physica A (IF 2.924) Pub Date : 2020-07-04
    Pawel Sobkowicz; Robert H. Frank; Alessio E. Biondo; Alessandro Pluchino; Andrea Rapisarda

    We present a new way of estimation of the role of chance in achieving success, by comparing the empirical data from 100-m dash competitions (one of the sports disciplines with the most stringent controls of external randomness), with the results of an agent-based computer model, which assumes that success depends jointly on the intrinsic talent of the agent and on unpredictable luck. We find a small

    更新日期:2020-07-09
  • Dynamic dependence between ETFs and crude oil prices by using EGARCH-Copula approach
    Physica A (IF 2.924) Pub Date : 2020-07-04
    Muhammad Naeem; Zaghum Umar; Sheraz Ahmed; El Mehdi Ferrouhi

    In this study, we examine the average and extreme dependence between Exchange Traded Funds ETFs (both energy & commodity) and WTI crude oil prices by using EGARCH-copula models. We use both static (Normal, Student-t, Gumbel and Clayton) and time-varying (Normal and SJC) copulas to explore both average and extreme dependence. Based on the Akaike information criterion (AIC), our results show that time-varying

    更新日期:2020-07-09
  • On the role of Tsallis entropy index for velocity modelling in open channels
    Physica A (IF 2.924) Pub Date : 2020-07-06
    Manotosh Kumbhakar; Rajendra K. Ray; Koeli Ghoshal; Vijay P. Singh

    Following the work on Shannon entropy together with the principle of maximum entropy, Luo and Singh (2010) and Singh and Luo (2011) explored the concept of non-extensive Tsallis entropy for modelling velocity in open channels. Later, the idea was extended by Cui and Singh (2012, 2013) by hypothesizing an accurate cumulative distribution function (CDF). However, these studies estimated the entropy index

    更新日期:2020-07-09
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