bluuebunny/crossref_metadata_2025_split huggingface dataset:
Numerical approximation of one model of bacterial self-organization
Authors: Čiegis Raimondas , Bugajev Andrej 
Published: August 2019

This paper presents finite difference approximations of one dimensional in space mathematical model of a bacterial self-organization. The dynamics of such nonlinear systems can lead to formation of complicated solution patterns. In this paper we show that this chemotaxisdriven instability can be connected to the ill-posed problem defined by the backward in time diffusion process. The method of lines is used to construct robust numerical approximations. At the first step we approximate spatial derivatives in the PDE by applying approximations targeted for special physical processes described by differential equations. The obtained system of ODE is split into a system describing separately fast and slow physical processes and different implicit and explicit numerical solvers are constructed for each subproblem. Results of numerical experiments are presented and convergence of finite difference schemes is investigated.
Solitary wave fission and fusion in the (2+1)-dimensional generalized Broer–Kaup system
Authors: Dai Chaoqing , Liu Cuiyun 
Published: August 2019

Via a special Painlevé–Bäcklund transformation and the linear superposition theorem, we derive the general variable separation solution of the (2 + 1)-dimensional generalized Broer–Kaup system. Based on the general variable separation solution and choosing some suitable variable separated functions, new types of V-shaped and A-shaped solitary wave fusion and Y-shaped solitary wave fission phenomena are reported.
On a third order initial boundary value problem in a plane domain
Authors: Klovienė Neringa 
Published: August 2019

Third order initial boundary value problem is studied in a bounded plane domain σ with C4 smooth boundary ∂σ. The existence and uniqueness of the solution is proved using Galerkin approximations and a priory estimates. The problem under consideration appear as an auxiliary problem by studying a second grade fluid motion in an infinite three-dimensional pipe with noncircular cross-section.
Visual decisions in the analysis of customers online shopping behavior
Authors: Pragarauskaitė Julija , Dzemyda Gintautas 
Published: August 2019

The analysis of the online customer shopping behavior is an important task nowadays, which allows maximizing the efficiency of advertising campaigns and increasing the return of investment for advertisers. The analysis results of online customer shopping behavior are usually reviewed and understood by a non-technical person; therefore the results must be displayed in the easiest possible way. The online shopping data is multidimensional and consists of both numerical and categorical data. In this paper, an approach has been proposed for the visual analysis of the online shopping data and their relevance. It integrates several multidimensional data visualization methods of different nature. The results of the visual analysis of numerical data are combined with the categorical data values. Based on the visualization results, the decisions on the advertising campaign could be taken in order to increase the return of investment and attract more customers to buy in the online e-shop.
On the analytic solutions for squeezing flow of nanofluid between parallel disks
Authors: Hashmi Meraj Mustafa Mustafa , Hayat Tasawar , Alsaedi Ahmed 
Published: August 2019

This article investigates the magnetohydrodynamic squeezing flow of nanofluid between parallel disks. Governing partial differential equations are converted into ordinary differential system via similarity transformations. We employ homotopy analysis method (HAM) to construct analytic expressions of velocity, temperature and nanoparticles volume fraction. Convergence analysis is performed and optimal values of the convergence-control parameters are determined. The computations are validated with the built in routine for solving nonlinear boundary value problems via shooting technique through software Mathematica 8.0. The behaviors of key parameters such as suction/blowing parameter (A), squeeze parameter (S), Hartman number (M), Brownian motion parameter (Nb) and thermophoresis parameter (Nt) are thoroughly examined. It is seen that the parameters have a great impact on the concentration field for the suction flow when compared with the blowing case. An intensification in the Brownian motion and thermophoresis effects results in the appreciable increase in the temperature and nanoparticles concentration.
Goodness-of-fit tests for sparse nominal data based on grouping
Authors: Radavičius Marijus , Samusenko Pavel 
Published: August 2019

. For (very) sparse nominal data, common goodness-of-fit tests usually fail. Alternative goodness-of-fit tests based on extended empirical Bayes approach and grouping are proposed and their consistency is proved. The performance of the tests is illustrated and compared with classical criteria by Monte Carlo simulations.
Adaptive hybrid function projective synchronization of chaotic systems with fully unknown periodical time-varying parameters
Authors: Xing Jinsheng 
Published: August 2019

In this paper, an adaptive learning control approach is presented for the hybrid functional projective synchronization (HFPS) of different chaotic systems with fully unknown periodical time-varying parameters. Differential-difference hybrid parametric learning laws and an adaptive learning control law are constructed via the Lyapunov–Krasovskii functional stability theory, which make the states of two different chaotic systems asymptotically synchronized in the sense of mean square norm. Moreover, the boundedness of the parameter estimates are also obtained. The Lorenz system and Chen system are illustrated to show the effectiveness of the hybrid functional projective synchronization scheme.
Large deviations for weighted random sums
Authors: Kasparavičiūtė Aurelija , Saulis Leonas 
Published: August 2019

In the present paper we consider weighted random sums ZN = ∑j=1NajXj, where 0 ≤ aj < ∞, N denotes a non-negative integer-valued random variable, and {X, Xj , j = 1, 2,...} is a family of independent identically distributed random variables with mean EX = µ and variance DX = σ2 > 0. Throughout this paper N is independent of {X, Xj , j = 1, 2,...} and, for definiteness, it is assumed Z0 = 0. The main idea of the paper is to present results on theorems of large deviations both in the Cramér and power Linnik zones for a sum ~ZN = (ZN − EZN )(DZN )−1/2 , exponential inequalities for a tail probability P(~ZN > x) in two cases: µ = 0 and µ ≠ 0 pointing out the difference between them. Only normal approximation is considered. It should be noted that large deviations when µ ≠ 0 have been already considered in our papers [1,2].
Nonlinear generalized cyclic contractions in complete G-metric spaces and applications to integral equations
Authors: Nashine Hemant Kumar Kumar , Kadelburg Zoran 
Published: August 2019

In this paper we introduce generalized cyclic contractions in G-metric spaces and establish some fixed point theorems. The presented theorems extend and unify various known fixed point results. Examples are given in the support of these results. Finally, an application to the study of existence and uniqueness of solutions for a class of nonlinear integral equations is given.
Detection of multiple changes in mean by sparse parameter estimation
Authors: Neubauer Jirí , Veselý Vítezslav 
Published: August 2019

The contribution is focused on detection of multiple changes in the mean in a onedimensional stochastic process by sparse parameter estimation from an overparametrized model. The authors’ approach to change point detection differs entirely from standard statistical techniques. A stochastic process residing in a bounded interval with changes in the mean is estimated using dictionary (a family of functions, the so-called atoms, which are overcomplete in the sense of being nearly linearly dependent) and consisting of Heaviside functions. Among all possible representations of the process we want to find a sparse one utilizing a significantly reduced number of atoms. This problem can be solved by ℓ1-minimization. The basis pursuit algorithm is used to get sparse parameter estimates. In this contribution the authors calculate empirical probability of successful change point detection as a function depending on the number of change points and the level of standard deviation of additive white noise of the stochastic process. The empirical probability was computed by simulations where locations of change points were chosen randomly from uniform distribution. The authors’ approach is compared with LASSO algorithm, ℓ1 trend filtering and selected statistical methods. Such probability decreases with increasing number of change points and/or standard deviation of white noise. The proposed method was applied on the time series of nuclear magnetic response during the drilling of a well.
Stability and absorbing set of parabolic chemotaxis model of Escherichia coli
Authors: Rionero Salvatore , Vitiello Maria 
Published: August 2019

This paper is devoted to model (1) for escherichia coli, introduced in [1]. Based on the experimental observations of Budrene and Berg [2, 3], Tyson and coworkers derived (1) with n cell density, c chemotrattactant concentration and s stimulant concentration. Our aim is to study the stability of constant meaning full solution and ultimately boundedness of the solutions. Precisely: (i) linear and nonlinear stability is proved by using a peculiar Lyapunov function, (ii) the ultimately boundedness of the solutions in the L2-norm is obtained, (iii) conditions guaranteeing the global stability are also obtained.
Multiple cycles and the Bautin bifurcation in the Goodwin model of a class struggle
Authors: Bella Giovanni 
Published: August 2019

The aim of this paper is to present the necessary and sufficient conditions for the emergence of a generalized Hopf (i.e., Bautin) bifurcation in the Goodwin’s model of a class struggle, and determine the parameter regions where multiple attracting and repelling limit cycles around the steady state may coexist.
Multi-objective single agent stochastic search in non-dominated sorting genetic algorithm
Authors: Lančinskas Algirdas , Ortigosa Pilar Martinez Martinez , Žilinskas Julius 
Published: August 2019

A hybrid multi-objective optimization algorithm based on genetic algorithm and stochastic local search is developed and evaluated. The single agent stochastic search local optimization algorithm has been modified in order to be suitable for multi-objective optimization where the local optimization is performed towards non-dominated points. The presented algorithm has been experimentally investigated by solving a set of well known test problems, and evaluated according to several metrics for measuring the performance of algorithms for multi-objective optimization. Results of the experimental investigation are presented and discussed.
Estimation of parameters of finite population L-statistics
Authors: Pumputis Dalius , Čiginas Andrius 
Published: August 2019

We consider the estimation of important parameters of a linear combination of order statistics (L-statistic) in a finite population, emphasizing the influence of auxiliary information on the estimation accuracy. Assuming that values of an auxiliary variable are available for all population units, we construct calibrated estimators for the variance of L-statistics and for the parameters, which define one-term Edgeworth expansions of distributions of L-statistics. The gain of the new estimators is demonstrated by the simulation study.
Triple-zero singularity of a Kaldor–Kalecki model of business cycles with delay
Authors: Wu Xiaoqin P. P. 
Published: August 2019

In this manuscript, we study triple zero singularity of a Kaldor–Kalecki model of business cycles with delay in both the gross product and the capital stock. By using the frameworks of Campbell–Yuan [1] and Faria–Magalhães [2, 3], the normal form on the center manifold is derived for this singularity and hence the corresponding bifurcation diagrams such as Hopf, BT, zero-Hopf, and homoclinic bifurcations are obtained. An example is given to verify some theoretical results.
Dynamic properties of the coupled Oregonator model with delay
Authors: Wu Xiang , Zhang Chunrui 
Published: August 2019

This work explores a coupled Oregonator model. By analyzing the associated characteristic equation, linear stability is investigated and Hopf bifurcations are demonstrated, as well as the stability and direction of the Hopf bifurcation are determined by employing the normal form method and the center manifold reduction. We also discussed the Z2 equivariant property and the existence of multiple periodic solutions. Numerical simulations are presented to illustrate the results in Section 5.
Pulsating flow of an incompressible micropolar fluid between permeable beds
Authors: Bitla Punnamchandar , Iyengar Telikicherla Kandala Venkatacharyulu Kandala Venkatacharyulu 
Published: August 2019

The paper deals with the pulsating flow of an incompressible micropolar fluid through a channel bounded by permeable beds. The fluid is injected into the channel from the lower permeable bed with a certain velocity and is sucked into the upper permeable bed with the same velocity. The flow between the permeable beds is assumed to be governed by micropolar fluid flow equations and that in the permeable regions by Darcy law. The Beavers–Joseph (BJ) slip boundary conditions are used at the interfaces of the permeable beds. The governing equations are solved analytically and the expressions for velocity, microrotation, mass flux and shear stress are obtained. The effects of diverse parameters on the velocity and microrotation are studied numerically and the results are presented through graphs.
Numerical solution of nonlinear elliptic equation with nonlocal condition
Authors: Čiupaila Regimantas , Sapagovas Mifodijus , Štikonienė Olga 
Published: August 2019

Two iterative methods are considered for the system of difference equations approximating two-dimensional nonlinear elliptic equation with the nonlocal integral condition. Motivation and possible applications of the problem present in the paper coincide with the small volume problems in hydrodynamics. The differential problem considered in the article is some generalization of the boundary value problem for minimal surface equation.
Weaker cyclic (phi,phi)-contractive mappings with an application to integro-differential equations
Authors: Nashine Hemant Kumar Kumar , Kadelburg Zoran 
Published: August 2019

We introduce a new variant of cyclic contractive mapping in a metric space and originate existence and uniqueness results of fixed points for such mappings. Examples are given to support the usability of our results. After these results, an application to integro-differential equations is given.
A survey of models for inference of gene regulatory networks
Authors: Ristevski Blagoj 
Published: August 2019

In this article, I present the biological backgrounds of microarray, ChIP-chip and ChIPSeq technologies and the application of computational methods in reverse engineering of gene regulatory networks (GRNs). The most commonly used GRNs models based on Boolean networks, Bayesian networks, relevance networks, differential and difference equations are described. A novel model for integration of prior biological knowledge in the GRNs inference is presented, too. The advantages and disadvantages of the described models are compared. The GRNs validation criteria are depicted. Current trends and further directions for GRNs inference using prior knowledge are given at the end of the paper.
Spatiotemporal chaos in Arnold coupled logistic map lattice
Authors: Zhang Ying-Qian , Wang Xing-Yuan 
Published: August 2019

In this paper, we propose a new spatiotemporal dynamics of Arnold coupled logistic map lattice (ACLML). Here, the coupling method between lattices is not a neighborhood coupling but the non-neighborhood of Arnold cat maps. In the proposed system, the criteria such as Kolmogorov–Sinai entropy density and universality, bifurcation diagram, mutual information, space amplitude and space-time diagrams are investigated in this paper. The new features of the proposed system include the lower mutual information between lattices, larger range of parameters for chaotic behaviors, the higher percentage of lattices in chaotic behaviors for most of parameters and less periodic window in bifurcation diagram. These features are more suitable for cryptography. For numerical simulations, we have employed the coupled map lattices system (CML) for comparison. The results indicate that the proposed system has those superior features to the coupled map lattice system (CML). It should be highlighted that the proposed ACLML is a suitable chaotic system for cryptography.
A bűnözői életnarratíva konstrukciói és kapcsolatuk az érzelmekkel
Authors: Kovács Zsuzsanna , Boros János , Patyi Dániel , Szucsáki Melinda 
Published: August 2019

Háttér és célkitűzések
Canter és Youngs (2009; Youngs és Canter, 2012) munkásságára támaszkodva a bűnözők kriminális identitásának és emocionális élményének kapcsolatát kívántuk feltárni vizsgálatunkban.

Módszer
Youngs és Canter (2012) interjúmódszerét alkalmaztuk kutatásunk során, melynek eredményeként kimutattuk a magyar bűnelkövetők mintájában is azt a négy narratívatípust (Bosszúálló, Profi, Tragikus hős, Áldozat), amelyet a szerzők leírtak (vö. Boros, Kovács, Zs., Patyi, Szucsáki és Kovács, K., 2017). Kiegészítettük a típusok jellemzését a bűncselekmény-narratíva, a kriminális előtörténet és demográfiai adatok alapján. Megvizsgáltuk a négy narratívatípus érzelmi szerveződését. Az érzelmi kérdőív kvantitatív elemzését és a narratívumok tartalomelemzését végeztük el.

Eredmények
A bűncselekmény közben átélt érzelmi élményről való utólagos beszámolóban az érzelmek a hatalom dimenziója mentén szerveződnek. A Profik esetében kevesebb negatív érzelem jelenik meg, mint a többi három típusnál. Az életnarratívum megkonstruálása az elvárt jellegzetességek szerint alakult, a Profik a redemptív, pozitívba hajló, a Bosszúállók a kontaminációs, negatívba hajló narratívaszerveződést mutatták, míg az Áldozatok elhárító jelleggel a negatív eseményeket ignoráló, kizárólag a pozitív eseményekre fókuszáló történetszövést preferálták.

Következtetések
A bűnelkövetők narratívaszerveződésében jól azonosíthatók az identitás-konstruálás érzelmi vetületei, amelyek segítségünkre lehetnek a társadalmi visszailleszkedési programok megtervezésében.
Az észlelt autonómiatámogatás hatása a teljesítéscélokra karate utánpótláskorosztályoknál
Authors: Kovács Krisztina , Gyömbér Noémi , Kelemen Ákos , Fodorné Földi Rita 
Published: August 2019

Háttér és célkitűzések
Az utánpótlássport specifikumai közé tartozik a korai lemorzsolódás elleni küzdelem, mely területen a szülői és edzői támogatás minősége kiemelt jelentőségű a sportolók motivációjának fenntartásában. A vizsgálat célja, hogy felmérje a kapcsolatot az utánpótláskorú sportolók célorientációja és az észlelt szülői és edzői autonómia támogatás mértéke között.

Módszer
A felmérésben 127 (fiú n = 65, lány n = 62), 12–21 év közötti (átlagéletkor:16,16 év; szórás 3,00) karatéka vett részt és töltötte ki a 3×2 Teljesítés–cél kérdőív a sportban (3×2 AGQ-S; Mascret, Elliot és Curry, 2015) skálát, az Észlelt edzői autonómia támogatás kérdőívet (SCQ; Deci, 2001; Hagger, Chatzisarantis, Barkoukis, Wang és Baranowski, 2005) és az Észlelt szülői autonómia támogatás kérdőívet (PASSES; Hagger és mtsai, 2007).

Eredmények
Az eredmények alapján kapcsolat van a sportoló feladatcéljai és az észlelt autonómia támogatás között (edzői rs = 0,314 p < 0,001; szülői rs = 0,292 p = 0,002). Ez a kapcsolat különösen az alacsonyabb edzésszámmal és kisebb eredményekkel jellemezhető sportolóknál lelhető fel, de eltűnik, ha az edzések száma emelkedik, vagy ha országos szinten értek el eredményeket. A kiemelt eredményekkel rendelkező sportolók esetében kapcsolat jelenik meg a célorientációk és az észlelt szülői autonómia támogatás között (rs = 0,707 p = 0,005). A feladatcélokat a lineáris regressziós modellek szerint az észlelt szülői autonómia támogatás növekvő mértéke jelezte előre.

Következtetések
Eredményeink alapján kitűnik, hogy a sportolói karrier kezdeti szakaszában a szülők és az edzők szerepe is jelentős, valamint kirajzolódik az, hogy a szülői szerepkör befolyását érdemes lehet újraértelmezni. Gyakorlati szempontból – a korai lemorzsolódás mértékének csökkentése érdekében – az utánpótlásképzés rendszerébe hasznos lenne beépíteni a sportháromszög dinamikai sajátosságainak megismertetését pszichoedukációs keretek között.
Vak gyermekek nyelv- és beszédfejlődésének sajátos vonásai és háttere
Authors: Pajor Emese , Beke Anna Mária , Csépe Valéria 
Published: August 2019

CélkituzésÁttekinto tanulmányunk célja egy kevéssé kutatott terület, a súlyos fokban látássérült (vak) gyermekek nyelv- és beszédfejlodésének bemutatása.MódszertanA témában kevés publikáció jelent meg, leginkább esettanulmányok, aminek oka a populáció (nagyon) kis elemszáma és a vak gyermekek egymástól jelentosen eltéro fejlodési üteme. A vizsgálatok és publikációk hiányát tovább fokozza, hogy a magyar nyelvi sajátosságok nehezen hasonlíthatók a kutatások zömét nyújtó angol nyelvu irodalom tényeihez. Tanulmányunkban a témában keletkezett kutatások eredményeit mutatjuk be.KövetkeztetésekA vak gyermekek nyelv- és beszédfejlodésében megfigyelheto eltérések különösen a fogalmak és reprezentációk kialakulásában, illetve a kommunikáció területén jelentosek, melyek iskoláskorra csökkennek. Látó gyermekekkel összehasonlítva, a vak csoport esetén az auditív információk jobb kódolása, illetve a fonémaalapú szóelohívási stratégia lehet a nagyobb verbális munkamemória-kapacitás és a fonémafluencia-feladatokban mérheto jobb teljesítmény hátterében. A verbális munkamemória és a jobb auditív percepciós elony felnottkorra is jellemzo. Ennek neurális háttere biztosított, mivel vizuális depriváció hatására sem inaktív egy agykérgi terület sem. A vak gyermekek nyelv- és beszédfejlodésében ezért megno a környezet szerepe.
A Civilization of Love according to John Paul II
Authors: Osewska Elżbieta , Simonič Barbara 
Published: August 2019

During his pontificate, Pope John Paul II strongly supported the idea of “civilization of love”. To the Polish Pope, the existence of ‘the civilization of love’ was the foundation of a humane world in the context of a civilization depreciating the value of the human being. This article addresses the concept of “the civilization of love”, with a special focus drawn to the aims, principles and fundamental assumptions of “the civilization of love.”
The Lay Person and his Christian Vocation in the Teaching of Pope John Paul II
Authors: Stala Józef , Vodičar Jenez 
Published: August 2019

Pope John Paul II in his oral and written teaching emphasised that Jesus Christ is the Redeemer of every human being and the same time underlined the value and dignity of every person, as well as his/her calling. In the 21st century, it is still worth recollecting the depth of teaching of John Paul II, especially the truth about the human being and his/her vocation through the mystery of the Redeemer. Therefore, this article will present some points from the documents written by Pope John Paul II, which refer to the Christian vocation of a lay man.