عنوان رویداد:
دانشگاه حکیم سبزواری
تاریخ برگزاری : 07 بهمن 1400
This article is devoted to studying a fractional model of the election with three parties. For this aim, we used the fractional derivative in Caputo sense. The stability of some equlibria in this model is investigated by the fractional RouthHurwitz stability criterion. Also, our numerical results of the proposed model show the simplicity and the eciency of the proposed cri و...
This paper examines the impact of McGinley dynamic indicator On the total index of Iran Stock Exchange. The trend of the total index of Iran Stock Exchange is considered as a dynamic system. Two points are important here. The first point is that this indicator, using recursive relations, presents a very close and formulable approximation of the trend chart of the total index of و...
In this paper, we study a rich and important class of Finsler metrics called Finsler warped product metrics. We find an equation that characterizes locally projectively flat warped product metrics. Further, we study Einstein Finsler warped product metrics. و...
The investigation of rotating fluids in the context of general relativity received remarkable consideration principally after Godel proposed relativistic model of a rotating dust universe. In this paper, a comprehensive analysis regarding the structure of the Lie algebra of Killing vector fields for a specific solution of field equations describing the behaviour of rotating flu و...
Let $X$ be an entropy minimal synchronized system and $varphi:X ightarrow Y$ a factor code. We show that $Y$ is synchronized whenever $varphi$ is entropy preserving. With this property, entropy preserving is equivalent to having a degree. Moreover, entropy minimality is equivalent to $X$ being intrinsically ergodic of full support and in this situation, t و...
In this paper, we introduce the notion of topological entropy on topological hypernormed hypergroup and provide some interesting examples. So, we obtain the fundamental properies of this entropy such as invariance under conjugation; Invariance under inversion;logarithmic law; Monotonicily for subflows; Continuity for direct limits و...
Evaluating Persian Gazelles population can improve our understanding about the population fluctuations of large mammals in eastern Iran. The present article showed that the most important threatening factors for the population reduction of Persian Gazelle are natural and human-wise parameters. In the present research work, we consider an animal population concluding some parame و...
A measure-theoretic pressure was defined by L. He, J. Lv and L. Zhou Definition of measure-theoretic pressure using spanning sets, Acta Math. Sinica(English Series), 20 (2004), 709-718 based on Katok entropy formula. In this article, we investigate an upper bound for the measure theoretic pressure of a C2 endomorphism on a closed s-dimensional Riemannian manifold (compact و...
In the present paper, we consider a family of one-dimensional discontinuous monotone dynamical systems of the interval 0; 1 onto itself, with N = 2 branches and investigate their chaotic dynamics. Here we follow the defi nition suggested by Devaney in order to show robust full chaos. و...
در این مقاله، تابع مولد اطلاع برای باقیمانده عمر یک مولفه یا سیستم بر اساس رکوردها محاسبه شده است. ثابت میشود که تابع نرخ خطر رکورد به طور یکتا مقدار تابع مولد اطلاع باقیمانده عمر را تعیین میکند. دو کلاس ناپارامتری بر اساس تابع مولد اطلاع باقیمانده عمر رکوردها تعریف شده و کرانهایی برای این تابع مولد ارائه میشود. در انتها به محاسبه تابع مولد اطلاع باقیمانده عمر برای رکوردها و...
In this paper, we study certain conditions that a multiply warped product could be a gradient Ricci harmonic-Bourguignon soliton. Also, we obtain some conditions that potential function be constant and consequently multiply warped product be a harmonic-Einstein manifold. و...
In this paper we study various notions of shadowing of dynamical systems so-called time varying maps. We define and study the h-shadowing, limit shadowing, s- limit shadowing and exponential limit shadowing properties of these dynamical systems. We investigate the relationships between these notions of shadowing and examine the role that expansivity plays in shadowing prope و...
The harmonicity vector fields on Einstein Lorentzian Lie groups type (a1) are determined. Left-invariant vector fields defining harmonic maps are also classified. و...
In this paper, we give a generalization of Chow--Rashevskys theorem for control systems in regular connected manifolds modeled on convenient locally convex vector spaces which are not necessarily normable. To indicate an application of our approach to the infinite-dimensional geometric control problems, we conclude with a novel controllability result on the group of orientatio و...
This paper will show that all shift spaces are flow equivalent to shifts of arbitrarily small entropy. و...
در دهۀهای اخیر بین سیستمهای مینیمال کانتور در شاخۀ سیستمهای دینامیکی، گروههای بُعدی در شاخۀ جبر و دیاگرامهای براتلی در شاخۀ ترکیبیات رابطههای دوسویهای پدیدار شده که در نوع خود جذاب، کاربردی و زیباست. در این مقاله در نظر داریم با معرفی هر کدام از این مفاهیم، نمایی از ارتباط بین آنها را به نمایش گذاریم. و...
Let (L,≤) be a finite lattice and f:L^n→L^n be a lattice network over dependency graph G=(V,E). We prove that f is a fixed-point system. Also we analyse fixed points of f is some special cases. و...
Over the past century, mathematical modeling has made the connection between important public health questions and the basic parameters of infection for a proper understanding of the spread of disease has been used. Nowdays, every scientist and researcher knows the importance and appreciation of dynamical systems and differential equations in ecology, biology, medicine, epid و...
آنتروپی نقش مهمی در مباحث قابلیت اعتماد و مطالعات طول عمر سیستمها ایفا میکند. دادههای ترتیبی نیز دارای کاربرد فراوان در مدلسازی و استنباط آماری هستند که از مهمترین این دادهها میتوان آمارههای ترتیبی را نام برد. آمارههای ترتیبی در بسیاری از شاخههای آمار از جمله نظریه قابلیت اعتماد کاربرد دارند. در سیستمهای n-i+1 از n، آماره ترتیبی iام بیانگر طول عمر سیستم است. در مطال و...
In this talk, we introduce the notions of shadowing and ergodic shadowing properties of finitely generated semigroup actions on non-compact metric spaces which are dynamical properties and equivalent to the classical definitions in case of compact metric spaces. و...
کانالهای یونی پتاسیم و سدیم در غشای سلول های نورونی دارای تعدادی زیر واحد می باشند که هر کدام به طور مستقل باز و بسته می شوند. زمانی که تمام این زیر واحدها باز باشند، انتقال یون ها امکان پذیر می باشد. تعداد زیر واحد های باز این کانال ها را می توان به عنوان حالت های یک زنجیر مارکف زمان پیوسته با حالت های گسسته در نظر گرفت. هدف از این مقاله معرفی مدل های زنجیر مارکف و مدلها و...
در این مقاله، پایداری و انشعاب مدل تصادفی I_ Na,p +I_K از سیستمهای دینامیکی علوم اعصاب مورد مطالعه قرار میگیرد. شرایط بروز انشعابهای D و P را در مدل تصادفی مورد نظر بررسی میکنیم. با استفاده از چند مورد شبیهسازی عددی و رسم خروجی برنامههای مرتبط با مدل, درستی نتایج تئوری را راستی آزمایی میکنیم. و...
The Ricci flow in Finsler geometry is defined as a natural generalization of the Hamiltons Ricci flow on Riemannian maniflods. It seems that, this definition is completely suitable for Ricci flow in Finsler geometry. Here, its stated the reasons for the appropriateness of this definition, similar to the Hamiltons work. و...
Limit curve theorem is the strongest tools for the study of causal structure of space- time. This tries to formulate the treatments of causal curve families and their limit. In this psper, we focus on some causal conditions along any elements of causal curve families and study the satisfacation of these conditions along the limit curve. و...
In this paper, in order to develop a mathematical model underlying uncertainty and fuzziness in a dynamical system, which is called relative mathematical modeling, we are going to apply the notion of observer. First, by using a mathematical model of a one dimensional observer, the notion of relative entropy for a relative dynamical system having countably و...
In this paper, we first introduce semi-symmetric metric and semi-symmetric non-metric connections on a (n+p)-dimensional semi-Riemannian manifold (M; g). Then we obtain relations between mean curvatures of these connections and the Levi-Civita connection. و...
It is known for some of the causality conditions that they can’t fail at a single isolated point. Recetlely, it is shown that if causal continuity or stable causality fail at a point p then there is a null geodesic segment containing p at every point of which the condition fails. In this paper, we show that if causal simplicity fails at a point p of a reflecting spacetime M then و...
در این مقاله به ارائه و بررسی یک مدل ریاضی برای شیوع ویروس کرونا در جامعه میپردازیم. در این مدل افراد جامعه را به چهار دستهی: افراد مستعد دریافت عامل بیماری و ناقلین بیماری(در رابطه با ویروس کرونا تمام افرادجامعه مستعد دریافت ویروس هستند و از آنجا که ناقلین شناسایی نمی شوند در گروه مستعدین قرار می گیرند)، افراد آلوده به ویروس کرونا، افراد بیماری که تحت درمان قرار گرفتهاند و و...
We introduce topological definition of asymptotic average shadowing property. We show that this property implies that every two disjoint points in the space are proximal. و...
Using the fixed point method, we prove the Hyers-Ulam stability and the superstability of n-Jordan ∗-homomorphisms in Fr´echet locally C∗-algebras و...
Entropy, has many applications in thermodynamics, code theory, physics, statistics and information theory. In this paper, we present some new and interesting results related to the bounds of the Shannon entropy. و...
For a dynamical system $(X,f)$, the concept of ``conjugate is studied by many authors. Our goal is to introduce and study this concept in pointfree topology to give a description of categorical properties of conjugate in localic dynalical systems. We give the relation between the category extbf TDS of dynamical systems and the category extbf LDS of localic dynamical s و...
Using the action of a Lie group on a hypergroup, the notion of Lie hyper- group is defined. It is proved that tangent space of a Lie hypergroup is a hypergroup and that a differentiable map between two Lie hypergroup is good homomorphism if and only if its differential map is a good homomorphism و...
In this talk, we solve the problem of the coexistence of periodic orbits in homogeneous parallel Boolean dynamical systems which are induced by majority function, with a directed dependency graph. In particular, we show that periodic orbits of any period can coexist. This result contrasts with the properties of their counterparts over simple graphs with the same evolution opera و...
The aim of this manuscript is to discuss the dynamics of a coronavirus disease 2019 (COVID--19) model. We first prove the positivity and boundedness of solution of the proposed COVID--19 model. Thence, we determine the equilibrium points and discuss the stability analysis of the model. In continuation, we show that the equilibrium points are locally asymptotically stable. We ap و...
In this paper, we define the notions of MV-pseudo norm and MV-pseudo metric on MV-algebras and study some of their algebraic properties. The notion of uniform MV-algebra is also introduced and its relationship to MV-pseudo metrics is studied. و...
In this paper, we study mean ergodic shadowing property and obtain some results in relation with other partial shadowing. We show that mean ergodic shadowing implies $overline d $-shadowing property, and any minimal system with mean ergodic shadowing does not have $mathcal F _s$-shadowing property. In addition, by giving some examples, we show that the shadowing property and و...
The moving coframe method is applied to solve the local equivalence problem for the equation of the form $u_ xx =u_t+Q(u)u_x$ in two independent variables under an action of the pseudo-group of contact transformations. The structure equations, invariants and equivalent condition of this equations are found. و...
در این مقاله، یک فرمولبندی ماتریسی برای حل عددی معادلات انتگرالی غیرخطی نوع اول با استفاده از موجکهای لژاندر ساخته شده است. با بکارگیری موجکهای لژاندر، معادله انتگرال به یک سیستم از معادلات جبری غیرخطی تبدیل میشود. در نهایت سیستم جبری حاصل را حل کرده و جوابی تحلیلی-تقریبی برای معادله انتگرال بدست خواهیم آورد. برای توضیح اثربخشی و اعتبار روش مورد بحث، مثالی عددی ارائه شده اس و...
In this paper, we introduce two linear connections, that are called Schouten and Vranceanu connections, on a metallic Riemannian manifold and study the notion of parallelism for distributions derived frome metallic structure with respect to the Schouten and Vranceanu connections.. و...
Many classic finance, such as the Black-Scholes option pricing model, has its origins equation: $$frac 1 P dP= mu dt+ sigma dW,$$ In this article, we tried to review this model on the Iran Stock Exchange index in 1399. This led to finding relation to model the future forecast of the Tepix of Iranian . و...
are introduced to (Σ; h) be geodesically convex and geodesically connected. Recently, the relationship between (geodesics) convexity, connectedness, and completeness properties in Riemannian manifolds (Σ; h) and the causal properties in Lorentzian static spacetimes (M; g) = (R×Σ; dt2+h) is studied. In this paper, some sufficient conditions are introduced to (Σ; h) be geodes و...
در این مقاله به مطالعه بین بعد متوسط سیستم دینامیکی و مفهوم انبساطی پیوستار یک سیستم دینامیکی خواهیم پرداخت و...
The orbit of a point $xin X$ in a classical iterated function system (IFS) is defined as $ f_u(x)=f_ u_n circcdots circ f_ u_1 (x):$ $u=u_1cdots u_n$ is a word of a full shift on finite symbols$ $. In other words, an IFS is parameterized over the full shift. Here, we parameterize over an arbitrary shift space $Sigma$. We associate to $sigmainSigma$ a non-autonomous syste و...
In this paper, we introduce the notion of sympathetic hom-Lie superalgebras. We prove some results on sympathetic multiplicative hom-Lie superalgebras with surjective α. In particular, we find some equivalence condition in which a sympathetic graded hom-ideal is direct factor of multiplicative hom-Lie superalgebra. و...
We give a stabilized version of any *-isomorphism $O_X o O_Y$ which maps $C(X)$ onto $C(Y)$ is in fact diagonal-preserving under mild conditions on $X$ and $Y$. و...
یکی از مهمترین بخش ساختارهای توپولوژیکی، متریکپذیری میباشد که شرایطی را به وجود میآورد تا یک متر مانند d یافت شود به طوریکه توپولوژی به دست آمده از این متر، با توپولوژی اولیه یکسان باشد. در این دستنوشته در پی آن هستیم که پلیگروهای توپولوژیکی را متریک پذیر سازیم. این مهم را به کمک تعریف پیشنرم روی پلیگروههای توپولوژیکی انجام میدهیم و در نهایت قضیه اساسی متریکپذیری را و...
در این مقاله، ابتدا وجود اندازه SRB برای نگاشتهای نعل اسبی تعمیمیافته بررسی میشود. سپس، ثابت میشود که تحت دو شرط تقاطع و فربهی، این اندازه نسبت به اندازه لبگ مطلقاً پیوسته است. و...
در این سخنرانی، به مطالعه فضاهای (α; β)- متریک های متقارن تعمیم یافته میپردازیم. نشان می دهیم که فضاهای (α; β)- متریک متقارن تعمیم یافته با متریک ماتسوموتو، ریمانی است. و...
در این نوشتار با کاهش بعضی شرایط حبرهای لی، ساختار جدیدی بهنام جبر تعمیمیافته معرفی شدهاست. با ارائهی گزارهها و مثالهای مختلف نشان دادهشدهاست که این ساختار بهراحتی روی بسیاری فضاهای برداری قابل تعریف است. و...