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Influence of a political scandal on voting in a simple model Physica A (IF 2.924) Pub Date : 20200806
Michel Droz; Andrzej PȩkalskiA simple computer model describing the influence of a political scandal on a voting process in a twoparty 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

Identification of healthy and pathological heartbeat dynamics based on ECGwaveform using multifractal spectrum Physica A (IF 2.924) Pub Date : 20200806
Xiaodong Yang; Zhixiao Wang; Aijun He; Jun WangHuman body surface electrocardiogram (ECG) is nonstationary and frequencyvarying by nature that belongs to a typical nonlinear signal. Therefore, traditional linear and timefrequency 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

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 : 20200806
Yangyang Meng; Xiangliang Tian; Zhongwen Li; Wei Zhou; Zhijie Zhou; Maohua ZhongTo study the topological complexity of urban rail transit (URT) networks with the multiline 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

Clusters and the entropy in opinion dynamics on complex networks Physica A (IF 2.924) Pub Date : 20200806
Wenchen Han; Yuee Feng; Xiaolan Qian; Qihui Yang; Changwei HuangIn this work, we investigate a heterogeneous population in the modified HegselmannKrause 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

Opinion attractiveness and its effect in opinion formation models Physica A (IF 2.924) Pub Date : 20200806
Mayte PérezLlanos; Juan Pablo Pinasco; Nicolas SaintierIn 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

Intelligent forecasting of inbound tourist arrivals by social networking analysis Physica A (IF 2.924) Pub Date : 20200718
FongChing YuanTourism 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

Binary indices of time series complexity measures and entropy plane Physica A (IF 2.924) Pub Date : 20200731
Binbin Shang; Pengjian ShangComplexity of time series is an important feature of dynamical systems such as financial systems. In order to bring out the complete nonlinear behavior of financial time series, nonlinear 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

International investors and the multifractality property: Evidence from accessible and inaccessible market Physica A (IF 2.924) Pub Date : 20200805
Songsong Li; Nan Xu; Xiaofeng HuiThis study provides the evidence that the transactions of international investors in the stock market exacerbate the degree of market multifractality. We analyze shares crosslisted in an accessible market (Hshares in Hong Kong) and an inaccessible market (Ashares in mainland China) by applying the method of multifractal detrended fluctuation analysis (MFDFA) from 01 January 2010 to 31 December

Google matrix analysis of bifunctional SIGNOR network of proteinprotein interactions Physica A (IF 2.924) Pub Date : 20200805
Klaus M. Frahm; Dima L. ShepelyanskyDirected 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

Ball and chain effect: Is Turkey’s growth rate constrained by current account deficit? Physica A (IF 2.924) Pub Date : 20200730
Mustafa Özer; Marko MalovicPersistent 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

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 : 20200721
Shin Funada; Jun SuzukiWe 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

Interface evolution in phase transformations ruled by nucleation and growth Physica A (IF 2.924) Pub Date : 20200728
Massimo TomelliniAn 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

An improved carfollowing model considering electronic throttle dynamics and delayed velocity difference Physica A (IF 2.924) Pub Date : 20200801
Shihao Li; Rongjun Cheng; Hongxia GeWith consideration of the effect of the electronic throttle dynamics, an improved carfollowing 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

Bypassing the truncation problem of truncated Lévy flights Physica A (IF 2.924) Pub Date : 20200803
Raul Matsushita; Sergio Da Silva; Regina Da Fonseca; Mateus NagataWe 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.

Multivariate cumulants in outlier detection for financial data analysis Physica A (IF 2.924) Pub Date : 20200728
Krzysztof DominoThere 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 crosscorrelated extreme positive or negative returns of many assets. Such returns are modelled

On the resistance distance and Kirchhoff index of a linear hexagonal (cylinder) chain Physica A (IF 2.924) Pub Date : 20200731
Sumin Huang; Shuchao LiThe 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 6cycles. 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

Empirical study of financial crises based on topological data analysis Physica A (IF 2.924) Pub Date : 20200722
Hongfeng Guo; Shengxiang Xia; Qiguang An; Xin Zhang; Weihua Sun; Xinyao ZhaoWe 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

Scalefree and smallworld properties of a multiplehub network with fractal structure Physica A (IF 2.924) Pub Date : 20200731
Yuke Huang; Hanxiong Zhang; Cheng Zeng; Yumei XueIn this paper, we introduce a new kind of multiplehub 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 scalefree and smallworld effects of this network.

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 : 20200803
Mustafa Gençaslan; Mustafa KeskinThe dynamic magnetic properties of the mixed spin (1/2, 3/2) Ising system with bilinear nearestneighbor exchange interactions and a crystalfield 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

Uniform quantized electron gas: Radiation correction Physica A (IF 2.924) Pub Date : 20200803
Johan S. Høye; Enrique LombaIn 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

A discrete fractionalorder Cournot duopoly game Physica A (IF 2.924) Pub Date : 20200730
Baogui Xin; Wei Peng; Yekyung KwonThis paper focuses on associating the Cournot duopoly problem with longmemory effects. First of all, we generate a discrete fractionalorder Cournot duopoly game by introducing the Caputo fractionalorder difference calculus to the classical duopoly theory. In the fractionalorder game, participants can make their decisions by taking full advantage of their historical information. Then we discuss

Dynamic rumor spreading of public opinion reversal on Weibo based on a twostage SPNR model Physica A (IF 2.924) Pub Date : 20200730
Guoyin Jiang; Saipeng Li; Minglei LiExploring 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 twostage 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

The distribution of union size: Canada, 1913–2014 Physica A (IF 2.924) Pub Date : 20200731
Michele CampolietiI 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

Ordinary and extraordinary waves in hot nonextensive plasma Physica A (IF 2.924) Pub Date : 20200728
M. Sharifi; M.N. NasrabadiIn 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

Twosided matching and strategic selection on freight resource sharing platforms Physica A (IF 2.924) Pub Date : 20200801
Zhihong Wang; Yangyang Li; Fu Gu; Jianfeng Guo; Xiaojun WuTo resolve problems of information asymmetry and low matching efficiency in freight market, a freight resource sharing platform must provide accurate and readily acceptable vehiclecargo matching results. We study a twosided 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 vehiclecargo

Exploring the behavioral risk chains of accidents using complex network theory in the construction industry Physica A (IF 2.924) Pub Date : 20200801
Shengyu Guo; Xinyu Zhou; Bing Tang; Peisong GongAccident 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

Human wealth evolution: Trends and fluctuations Physica A (IF 2.924) Pub Date : 20200729
Paolo Sibani; Steen RasmussenIs 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

Rethinking critical node problem for railway networks from the perspective of turnback operation Physica A (IF 2.924) Pub Date : 20200722
Hiroki Noguchi; Masaaki FuseVulnerability assessment studies addressing the critical node problem for railway networks do not recognize the importance of turnback operations as a typical reaction to disruption. The aim of this study is to explore the significance of turnback operations during the process of identifying critical stations. This significance was quantified by comparing the results of critical stations (both with

Grand canonical description of equilibrium and nonequilibrium systems using spin formalism Physica A (IF 2.924) Pub Date : 20200729
Segun Goh; JunHyuk Woo; JeanYves Fortin; MooYoung ChoiWe 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

Conditions for the existence of a generalization of Rényi divergence Physica A (IF 2.924) Pub Date : 20200725
Rui F. Vigelis; Luiza H.F. de Andrade; Charles C. CavalcanteWe 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 nonatomic, 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

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 : 20200723
JiXuan HouIn the commented paper, the authors study a gas of noninteracting fermions confined in a onedimensional 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 grandcanonical approach than the Boltzmann temperature. In this comment we point out their conclusion is

Newton equation and Schrödinger equation for the harmonic oscillator with probability distributions in frequency Physica A (IF 2.924) Pub Date : 20200724
Won Sang Chung; Hassan Hassanabadi; Jan Kr̆íz̆In 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

Platform launch in twosided markets and users’ expectations Physica A (IF 2.924) Pub Date : 20200728
Yang Geng; Yulin ZhangThis 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

Scholar’s career switch adhesive with research topics: An evidence from China Physica A (IF 2.924) Pub Date : 20200728
Yinghong Ma; Le Song; Zhaoxun Ji; Qian Wang; Qinglin YuDespite 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 twolayer network model, coauthors collaboration network (αlayer) for scholars research

Nonlinear kinetics of transition between transport flow modes Physica A (IF 2.924) Pub Date : 20200728
Alexei Khomenko; Alexey ShikuraThe 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 threedimensional phase portraits of the kinetics of these nonequilibrium parameters

Link prediction using node information on local paths Physica A (IF 2.924) Pub Date : 20200728
Furqan Aziz; Haji Gul; Ishtiaq Muhammad; Irfan UddinLink 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

Thermodynamics of urban growth revealed by city scaling Physica A (IF 2.924) Pub Date : 20200727
Lorraine Sugar; Chris KennedyCities are complex systems, where microscale phenomena lead to emergent, macroscale 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

Anomalous statistics of particle spreading in quenched random velocity field Physica A (IF 2.924) Pub Date : 20200727
M. Ghasemi NezhadhaghighiWe 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

On the statistical evolution of viscous vortexgas free shear layers Physica A (IF 2.924) Pub Date : 20200725
S. Suryanarayanan; R. NarasimhaThe temporal vortexgas free shear layer is a Hamiltonian system of Npoint vortices in a singlyperiodic domain relevant to the (largescale) 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 selfsimilar regime (RII) with a universal constant spreading

COVID19 in Italy and extreme data mining Physica A (IF 2.924) Pub Date : 20200725
Paolo Massimo Buscema; Francesca Della Torre; Marco Breda; Giulia Massini; Enzo GrossiIn 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

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 : 20200722
Gabriel Morgado; Bogdan Nowakowski; Annie LemarchandA 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

The critical two dimensional Ising model on righttriangleshaped square lattices Physica A (IF 2.924) Pub Date : 20200722
Xintian Wu; Shenghong SunUsing the bondpropagation 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

Eigenvalues of Ising connection matrix with longrange interaction Physica A (IF 2.924) Pub Date : 20200715
L.B. Litinskii; B.V. KryzhanovskyWe 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 onedimensional Ising connection matrix (the latter are well known). To do this we present the eigenvectors as Kronecker products of the eigenvectors of the onedimensional

Study on state feedback control strategy for carfollowing system Physica A (IF 2.924) Pub Date : 20200721
Tao Song; WenXing ZhuA state feedback control strategy of modern control theory is proposed to analyze the classical carfollowing system. From the point of view of control theory, the influence of changing two important states velocity and headway on the stability of the carfollowing system is analyzed. The stability conditions of the control parameters are obtained by the conditions for roots of characteristic polynomials

Influence of Starkshift on quantum coherence and nonclassical correlations for two twolevel atoms interacting with a singlemode cavity field Physica A (IF 2.924) Pub Date : 20200717
Abdallah Slaoui; Ahmed Salah; Mohammed DaoudAn exact analytic solution for two twolevel atoms coupled with a multiphoton singlemode 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

Exploring node importance evolution of weighted complex networks in urban rail transit Physica A (IF 2.924) Pub Date : 20200714
Yangyang Meng; Xiangliang Tian; Zhongwen Li; Wei Zhou; Zhijie Zhou; Maohua ZhongWith 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

A robust train timetable optimization approach for reducing the number of waiting passengers in metro systems Physica A (IF 2.924) Pub Date : 20200715
Li Zhou; Xin Yang; Huan Wang; Jianjun Wu; Lei Chen; Haodong Yin; Yunchao QuTimetable 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

Classical and statistical limits of the quantum singular oscillator Physica A (IF 2.924) Pub Date : 20200716
Caio Fernando e Silva; Alex E. BernardiniThe classical boundaries of the quantum singular oscillator (SO) is addressed under Weyl–Wigner phasespace and Bohmian mechanics frameworks as to comparatively evaluate phasespace and configuration space quantum trajectories as well as to compute distorting quantum fluctuations. For an engendered pure state quasigaussian Wigner function that recovers the classical time evolution (at phase and configuration

Classical lattice models with singlenode interactions on hierarchical lattices: The twolayer Ising model Physica A (IF 2.924) Pub Date : 20200712
A.V. Myshlyavtsev; M.D. Myshlyavtseva; S.S. AkimenkoA general approach is proposed for renormalization group transformations at arbitrary hierarchical lattices with two root nodes and the presence of singlenode interactions (interactions between layers, magnetic field, chemical potential, etc.). The effectiveness of the proposed approach was shown for the twolayer Ising model in a zero magnetic field on the simplest representative of folded square

Structural breaks and trend awarenessbased interaction in crypto markets Physica A (IF 2.924) Pub Date : 20200711
Şahin Telli; Hongzhuan ChenThis study aims to test multiple structural breaks using BaiPerron 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

Opinion dynamics with emergent collective memory: A society shaped by its own past Physica A (IF 2.924) Pub Date : 20200708
Gioia Boschi; Chiara Cammarota; Reimer KühnIn 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

Interparticle correlations in the simple cubic lattice of ferroparticles: Theory and computer simulations Physica A (IF 2.924) Pub Date : 20200713
Anna Yu. Solovyova; Andrey A. Kuznetsov; Ekaterina A. ElfimovaAnisotropic interparticle correlations in the simple cubic lattice of singledomain 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

Governing equations for stress distribution in rhombic disk packings Physica A (IF 2.924) Pub Date : 20200710
Xinggang Zhang; Dan DaiThe 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 wellknown equations, i.e. the symmetry of stress tensor and the

WLDAP: A computational model of weighted lncRNAdisease associations prediction Physica A (IF 2.924) Pub Date : 20200709
Guobo Xie; Lifeng Wu; Zhiyi Lin; Ji CuiIncreasing evidence has demonstrated that long noncoding RNAs (lncRNAs) play essential roles in various human complex diseases. Compared with proteincoding genes, the associations between diseases and lncRNAs are still not well studied. Hence, inferring diseaseassociated lncRNAs on a genomewide scale has become an urgent matter. However, known associations are still being studied in small quantities

Revisiting Cornell potential model of the Quark–Gluon plasma Physica A (IF 2.924) Pub Date : 20200713
Prasanth J.P.; Sebastian Koothottil; Vishnu M. BannurThe equation of state (EoS) of Quark–Gluon plasma (QGP) is revisited with Mayer’s theory of plasma. We derived a semiclassical 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

A coarse graining algorithm based on morder degree in complex network Physica A (IF 2.924) Pub Date : 20200702
QingLin Yang; LiFu Wang; GuoTao Zhao; Ge GuoThe coarsegrained technology of complex networks is a promising method to analyze largescale networks. Coarsegrained networks are required to preserve some properties of the original networks. In this paper, we propose an morderdegreebased coarse graining (MDCG) algorithm to keep some statistical properties and controllability of the original network by merging the nodes with the same or similar

Revealing dynamic communities in networks using genetic algorithm with merge and split operators Physica A (IF 2.924) Pub Date : 20200704
Weihua Zhan; Lei Deng; Jihong Guan; Jun Niu; Dechao SunCommunity structures are pervasive in realworld 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 realworld networks are dynamic, and their community structures are evolving over time accordingly. How to reveal these dynamic communities has recently become a pressing

Inequalities, chance and success in sport competitions: Simulations vs empirical data Physica A (IF 2.924) Pub Date : 20200704
Pawel Sobkowicz; Robert H. Frank; Alessio E. Biondo; Alessandro Pluchino; Andrea RapisardaWe present a new way of estimation of the role of chance in achieving success, by comparing the empirical data from 100m dash competitions (one of the sports disciplines with the most stringent controls of external randomness), with the results of an agentbased computer model, which assumes that success depends jointly on the intrinsic talent of the agent and on unpredictable luck. We find a small

Dynamic dependence between ETFs and crude oil prices by using EGARCHCopula approach Physica A (IF 2.924) Pub Date : 20200704
Muhammad Naeem; Zaghum Umar; Sheraz Ahmed; El Mehdi FerrouhiIn this study, we examine the average and extreme dependence between Exchange Traded Funds ETFs (both energy & commodity) and WTI crude oil prices by using EGARCHcopula models. We use both static (Normal, Studentt, Gumbel and Clayton) and timevarying (Normal and SJC) copulas to explore both average and extreme dependence. Based on the Akaike information criterion (AIC), our results show that timevarying

On the role of Tsallis entropy index for velocity modelling in open channels Physica A (IF 2.924) Pub Date : 20200706
Manotosh Kumbhakar; Rajendra K. Ray; Koeli Ghoshal; Vijay P. SinghFollowing 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 nonextensive 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