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Communications Faculty of Sciences University of Ankara-Series A1 Mathematics and Statistics最新文献

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Two fractional order Langevin equation with new chaotic dynamics 具有新混沌动力学的两分数阶朗之万方程
Meriem Mansouria BELHAMITI, Zoubir DAHMANİ, Mehmet Zeki SARIKAYA
In the present paper, we introduce a two-order nonlinear fractional sequential Langevin equation using the derivatives of Atangana-Baleanu and Caputo-Fabrizio. The existence of solutions is proven using a fixed point theorem under a weak topology, and an illustrative example is then given. Furthermore, we present new fractional versions of the Adams-Bashforth three-step approach for the Atangana-Baleanu and Caputo derivatives. New nonlinear chaotic dynamics are performed by numerical simulations.
本文利用Atangana-Baleanu和Caputo-Fabrizio的导数,引入了一类二阶非线性分数阶序朗之万方程。利用弱拓扑下的不动点定理证明了该问题解的存在性,并给出了一个实例。此外,我们提出了Atangana-Baleanu和Caputo导数的Adams-Bashforth三步法的分数阶新版本。通过数值模拟实现了新的非线性混沌动力学。
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引用次数: 0
Constant pseudo-angle lightlike surfaces 恒定伪角类光表面
Gül TUĞ
The oriented angles between lightlike vectors cannot be defined properly compared to the timelike vectors in the Minkowski spacetime. Therefore, we use the pseudo-angles between any non-lightlike or lightlike vectors to develop the theory of lightlike surfaces having constant angle with a fixed nonlightlike direction. We investigate some geometric properties on these surfaces such as being a tangent developable. Besides, we construct the constant angle lightlike ruled surfaces by means of the null helices. We give several examples to illustrate the obtained surfaces.
与闵可夫斯基时空中的类光矢量相比,类光矢量之间的取向角不能被恰当地定义。因此,我们使用任何非类光或类光矢量之间的伪角来发展具有恒定角度和固定非类光方向的类光曲面理论。我们研究了这些表面上的一些几何性质,如切线可展。此外,我们还利用零螺旋构造了等角类光直纹曲面。我们给出了几个例子来说明所得到的曲面。
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引用次数: 0
An overview to analyticity of dual functions 对偶函数分析性综述
IF 0.9 Pub Date : 2022-12-30 DOI: 10.31801/cfsuasmas.1035344
Olgun Durmaz, Buşra Aktaş, Osman Keçilioğlu
In this paper, the analyticity conditions of dual functions are clearly examined and the properties of the concept derivative are given in detail. Then, using the dual order relation, the dual analytic regions of dual analytic functions are constructed such that a collection of these regions forms a basis on $D^n$. Finally, the equivalent of the inverse function theorem in dual space is given by a theorem and proved.
本文明确地检验了对偶函数的可分析性条件,并详细地给出了概念导数的性质。然后,利用对偶阶关系,构造对偶分析函数的对偶分析区域,使得这些区域的集合在$D^n$上形成基础。最后,用一个定理给出了对偶空间中反函数定理的等价性,并加以证明。
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引用次数: 1
A study on modeling of rat tumors with the discrete-time Gompertz model 用离散时间Gompertz模型建立大鼠肿瘤模型的研究
IF 0.9 Pub Date : 2022-12-30 DOI: 10.31801/cfsuasmas.914887
Levent Özbek
Cancer formation is one of the pathologies whose frequency has increased in the recent years. In the literature, the compartment models, which are non-linear, are used for such problems. In nonlinear compartment models, nonlinear state space models and the extended Kalman filter (EKF) are used to estimate the parameter and the state vector. This paper presents a discrete-time Gompertz model (DTGM) for the transfer of optical contrast agent, namely indocyanine green (ICG), in the presence of tumors between the plasma and extracellular extravascular space (EES) compartments. The DTGM, which is proposed for ICG and the estimation of ICG densities used in the vascular invasion of tumor cells of the compartments and in the measurement of migration from the intravascular area to the tissues, is obtained from the experimental data of the study. The ICG values are estimated online (recursive) using the DTGM and the adaptive Kalman filter (AKF) based on the experimental data. By employing the data, the results show that the DTGM in conjunction with the AKF provides a good analysis tool for modeling the ICG in terms of mean square error (MSE), mean absolute percentage error (MAPE), and . When the results obtained from the compartment model used in the reference [9] are compared with the results obtained with the DTGM, the DTGM gives better results in terms of MSE, MAPE and $R^2$ criteria. The DTGM and the AKF compartment model require less numerical processing when compared to the EKF, which indicates that DTGM is a less complicated model. In the literature, EKF is used for such problems.
癌症形成是近年来发病率增加的病理之一。在文献中,非线性的隔室模型被用于此类问题。在非线性隔室模型中,使用非线性状态空间模型和扩展卡尔曼滤波器(EKF)来估计参数和状态向量。本文提出了一种离散时间Gompertz模型(DTGM),用于在血浆和细胞外血管外间隙(EES)隔间之间存在肿瘤的情况下转移光学造影剂,即吲哚菁绿(ICG)。DTGM是为ICG和ICG密度估计而提出的,用于隔室肿瘤细胞的血管侵袭和测量从血管内区域到组织的迁移,它是从研究的实验数据中获得的。基于实验数据,使用DTGM和自适应卡尔曼滤波器(AKF)在线(递归)估计ICG值。通过使用这些数据,结果表明,DTGM与AKF相结合,为ICG的均方误差(MSE)、平均绝对百分比误差(MAPE)和建模提供了一个很好的分析工具。当将参考文献[9]中使用的隔间模型获得的结果与DTGM获得的结果进行比较时,DTGM在MSE、MAPE和$R^2$标准方面给出了更好的结果。与EKF相比,DTGM和AKF隔间模型需要较少的数值处理,这表明DTGM是一个不那么复杂的模型。在文献中,EKF被用于此类问题。
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引用次数: 0
Parity of an odd dominating set 奇支配集的奇偶性
IF 0.9 Pub Date : 2022-12-30 DOI: 10.31801/cfsuasmas.1051208
A. Batal
For a simple graph $G$ with vertex set $V(G)={v_1,...,v_n}$, we define the closed neighborhood set of a vertex $u$ as $N[u]={v in V(G) ; | ; v ; text{is adjacent to} ; u ; text{or} ; v=u }$ and the closed neighborhood matrix $N(G)$ as the matrix whose $i$th column is the characteristic vector of $N[v_i]$. We say a set $S$ is odd dominating if $N[u]cap S$ is odd for all $uin V(G)$. We prove that the parity of the cardinality of an odd dominating set of $G$ is equal to the parity of the rank of $G$, where rank of $G$ is defined as the dimension of the column space of $N(G)$. Using this result we prove several corollaries in one of which we obtain a general formula for the nullity of the join of graphs.
对于顶点集为$V(G)={V_1,…,V_n}$的简单图$G$,我们将顶点$u$的闭邻域集定义为 $n[u]={Vin V(G;u;text{or};v=u}$和闭邻域矩阵$N(G)$作为其第$i$列是$N[v_i]$的特征向量的矩阵。如果$N[u]cap S$对V(G)$中的所有$u都是奇数,则我们说集合$S$是奇数支配。我们证明了$G$的奇支配集的基数的奇偶性等于$G$秩的奇偶性,其中$G$阶被定义为$N(G)$的列空间的维数。利用这一结果,我们证明了几个推论,其中一个推论得到了图连接零度的一般公式。
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引用次数: 0
Ideal convergence of a sequence of Chebyshev radii of sets 集的切比雪夫半径序列的理想收敛性
IF 0.9 Pub Date : 2022-12-30 DOI: 10.31801/cfsuasmas.1123739
Hüseyin Albayrak
In this paper, we investigate the diameters, Chebyshev radii, Chebyshev self-radii and inner radii of a sequence of sets in the normed spaces. We prove that if a sequence of sets is I -Hausdorff convergent to a set, the sequence of Chebyshev radii of that sequence is I-convergent. Similar relations are showed for the sequence of diameters, Chebyshev self-radii and inner radii of that sequence.
本文研究赋范空间中一系列集的直径、切比雪夫半径、切比舍夫自半径和内半径。我们证明了如果一个集合序列是I-Hausdorff收敛于一个集合,则该序列的Chebyshev半径序列是I-收敛的。对于直径序列、切比雪夫自半径和该序列的内半径也显示出类似的关系。
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引用次数: 0
Farey graph and rational fixed points of the extended modular group 扩展模群的法雷图与有理不动点
IF 0.9 Pub Date : 2022-12-30 DOI: 10.31801/cfsuasmas.1089480
Bilal Demir, Mustafa Karataş
Fixed points of matrices have many applications in various areas of science and mathematics. Extended modular group ¯¯¯¯ΓΓ¯ is the group of 2×22×2 matrices with integer entries and determinant ±1±1. There are strong connections between extended modular group, continued fractions and Farey graph. Farey graph is a graph with vertex set ^Q=Q∪{∞}Q^=Q∪{∞}. In this study, we consider the elements in ¯¯¯¯ΓΓ¯ that fix rationals. For a given rational number, we use its Farey neighbours to obtain the matrix representation of the element in $overline{Gamma}$ that fixes the given rational. Then we express such elements as words in terms of generators using the relations between the Farey graph and continued fractions. Finally we give the new block reduced form of these words which all blocks have Fibonacci numbers entries.
矩阵的不动点在科学和数学的各个领域都有许多应用。扩展模群ΓΓ是一组2×22×2矩阵,具有整数项和行列式±1±1。扩展模群、连分式和Farey图之间有很强的联系。Farey图是一个顶点集为^Q=Qõ{∞}Q^=Qõ{∞}的图。在这项研究中,我们考虑了ΓΓ中固定有理数的元素。对于给定有理数,我们使用它的Farey邻居来获得$overline{Gamma}$中元素的矩阵表示,该矩阵表示固定了给定有理数。然后,我们使用Farey图和连分式之间的关系,用生成器将这些元素表示为单词。最后,我们给出了这些字的新的块简化形式,所有块都有Fibonacci数条目。
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引用次数: 0
Local $T_0$ and $T_1$ quantale-valued preordered spaces 本地$T_0$和$T_1$量子值预购空间
IF 0.9 Pub Date : 2022-12-30 DOI: 10.31801/cfsuasmas.1070240
Samed Özkan, M. Günes
In this paper, we characterize explicitly the separation properties $T_0$ and $T_1$ at a point p in the topological category of quantale-valued preordered spaces and investigate how these characterizations are related. Moreover, we prove that local $T_0$ and $T_1$ quantale-valued preordered spaces are hereditary and productive.
在本文中,我们显式地刻画了分数值预序空间拓扑范畴中p点上的分离性质$T_0$和$T_1$,并研究了这些性质之间的关系。此外,我们还证明了局部$T_0$和$T_1$量子值预序空间是可遗传的和可生产的。
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引用次数: 0
On $mathcal{F}$-cosmall morphisms 关于$mathcal{F}$-同胚态射
IF 0.9 Pub Date : 2022-12-30 DOI: 10.31801/cfsuasmas.1061084
Berke Kalebog̃az, D. Keskin Tütüncü
In this paper, we first define the notion of $mathcal{F}$-cosmall quotient for an additive exact substructure $mathcal{F}$ of an exact structure $mathcal{E}$ in an additive category $mathcal{A}$. We show that every $mathcal{F}$-cosmall quotient is right minimal in some cases. We also give the definition of $mathcal{F}$-superfluous quotient and we relate it the approximation of modules. As an application, we investigate our results in a pure-exact substructure $mathcal{F}$.
在本文中,我们首先定义了精确结构$mathcal{E}$在可加范畴$mathcal{A}$中的可加精确子结构$math{F}$的$mathical{F}$-cosmall商的概念。我们证明了在某些情况下,每一个$mathcal{F}$-cosmall商都是右极小的。我们还给出了$mathcal{F}$-多余商的定义,并将其与模的近似联系起来。作为一个应用,我们研究了纯精确子结构$mathcal{F}$中的结果。
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引用次数: 1
Stochastic integration with respect to a cylindrical special semi martingale 关于圆柱特殊半鞅的随机积分
IF 0.9 Pub Date : 2022-12-30 DOI: 10.31801/cfsuasmas.981876
Saeed Hashemi Sababe
In this research, we introduce the stochastic integration with respect to a cylindrical special semi-martingale, which is a specific case of general integration, with specific properties of special semi-martingales.
在这项研究中,我们引入了关于圆柱特殊半鞅的随机积分,这是一般积分的一个特例,具有特殊半鞅性质。
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Communications Faculty of Sciences University of Ankara-Series A1 Mathematics and Statistics
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