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Browsing Cilt:68 Sayı:01 (2019) by Title

Now showing items 31-50 of 98

    • Fixed point results for F-expansive mappings in ordered metric spaces 

      Gubran, Rqeeb; Alfaqih, Walled M.; Imdad, Mohammad (Ankara Üniversitesi Fen Fakültesi, 2019-02-01)
      In this article, we prove some existence and uniqueness fixed point results for F-expansive mappings in partially ordered metric spaces. We support the usability of our results adopting suitable examples.

    • Fixed point theorems for single valued α-ψ-mappings in fuzzy metric spaces 

      GUPTA, Vishal; SAİNİ, R. K.; VERMA, Manu (Ankara Üniversitesi, 2019-02-01)
      This article is the forward result of α-admissible and (α,ψ)-contractive mappings in fuzzy metric spaces. We establish new theorem for such contractions to find fixed point in fuzzy metric space. Our Theorem is generalizations ...

    • Flat Strong δ-covers of Modules 

      Demirci, Yılmaz Mehmet (Ankara Üniversitesi, 2019-02-01)
      We say that a ring R is right generalized δ-semiperfect if every simple right R-module is an epimorphic image of a flat right R-module with δ-small kernel. This definition gives a generalization of both right δ-semiperfect ...

    • Further study on the results of Sheremeta 

      BİSWAS, Tanmay (Ankara Üniversitesi Fen Fakültesi, 2019-02-01)
      In this paper we estimate some growth rates of composite entire and meromorphic functions in the light of their relative (p,q)-th order and relative (p,q)-th lower order which considerably extend some results of Sheremeta [14].

    • Generalization of (α-F_{d})--contraction on quasi--metric space 

      Acar, Özlem (Ankara Üniversitesi, 2019-02-01)
      In this paper, we introduce the concept of generalized (α-F_{d})-contraction and give some fixed point results in quasi metric spaces with different types of completeness.

    • Global behavior of a three-dimensional system of difference equations of order three 

      Tollu, Durhasan Turgut; Yalçınkaya, İbrahim (Ankara Üniversitesi, 2019-02-01)
      In this paper, we investigate the global behavior of the positive solutions of the system of difference equations u_{n+1}=((α₁u_{n-1})/(β₁+γ₁v_{n-2}^{p})), v_{n+1}=((α₂v_{n-1})/(β₂+γ₂w_{n-2}^{q})), w_{n+1}=((α₃w_{n-1 ...

    • Growth estimates of entire functions with the help of their relative L^{∗}-types and relative L^{∗}- weak types 

      DATTA, Sanjib Kumar; BİSWAS, Tanmay (Ankara Üniversitesi, 2019-02-01)
      In this paper we attempt to prove some results related to the growth rates of entire functions on the basis of relative L^{∗}-type and relative L^{∗}-weak type of an entire function with respect to another entire function.

    • Inequalities involving k-Chen invariants for submanifolds of Riemannian product manifolds 

      Gülbahar, Mehmet; Tripathi, Mukut Mani; Kılıç, Erol (Ankara Üniversitesi, 2019-02-01)
      An optimal inequality involving the scalar curvatures, the mean curvature and the k-Chen invariant is established for Riemannian submanifolds. Particular cases of this inequality is reported. Furthermore, this inequality ...

    • Influence of natural convection on stability of an inclined front propagation 

      Salhi, Loubna; Rouah, Hamza; Taik, Ahmed (Ankara Üniversitesi Fen Fakültesi, 2019-02-01)
      This research work may be considered as a continuation of a series of investigations concerning the influence of natural convection on stability of reaction fronts propagation. We consider an inclined propagating polymerization ...

    • Intersection graphs of co-ideals of semirings 

      Atani, S. Ebrahimi; PİSHHESARİ, Saboura Dolati; KHORAMDEl, Mehdi; Zahra Ebrahimi SARVANDİ, Zahra Ebrahimi (Ankara Üniversitesi Fen Fakültesi, 2019-02-01)
      Let R be a semiring with identity. In this paper, we introduce the intersection graph of co-ideals, denoted by G(R). The vertices of G(R) are non-trivial co-ideals of R, and two distinct vertices I and J are adjacent if ...

    • Iterated bootstrap procedure in individual bioequivalence 

      Beyaztaş, Ufuk (Ankara Üniversitesi Fen Fakültesi, 2019-02-01)
      In this paper, we propose an iterating principle in the bootstrap method to assess the individual bioequivalence under 2×4 randomized crossover design. The finite sample properties of the proposed algorithm are illustrated ...

    • k-autocorrelation and its applications 

      Özimamoğlu, Hayrullah; Şahin, Murat; Ölmez, Oktay (Ankara Üniversitesi Fen Fakültesi, 2019-02-01)
      The standard autocorrelation measures similarities between a binary sequence and its any shifted form. In this paper, we introduce the concept of the k-autocorrelation of a binary sequence as a generalization of the standard ...

    • Local pre-Hausdorff extended pseudo-quasi-semi metric spaces 

      Baran, Tesnim Meryem; Kula, Muammer (Ankara Üniversitesi Fen Fakültesi, 2019-02-01)
      In this paper, we characterize local pre-Hausdorff extended pseudo-quasi-semi metric spaces and investigate the relationships between them. Finally, we show that local pre-Hausdorff extended pseudo-quasi-semi metric spaces ...

    • Mathematical Analysis and Numerical Simulations for the Cancer Tissue Invasion Model 

      Meral, Gülnihal; Yamanlar, İbrahim Çağatay (Ankara Üniversitesi, 2019-02-01)
      Cancer cell invasion is one of the most important stages of metastasis. In this paper, the local existence and uniqueness of the cancer cell invasion model is proved using an iterative procedure. Moreover the numerical ...

    • Maximum Lq-Likelihood Estimation for the parameters of Marshall-Olkin Extended Burr XII Distribution 

      Özdemir, Şenay; Güney, Yeşim; Tuaç, Yetkin; Arslan, Olcay (Ankara Üniversitesi, 2019-02-01)
      Marshall--Olkin extended Burr XII (MOEBXII) distribution is proposed by Al-Saiari et al. (2014) to obtain a more flexible family of distributions. Some estimation methods like maximum likelihood, Bayes and M estimations ...

    • Multipoint selfadjoint quasi-differential operators for first order 

      Yılmaz, Bülent; Mert, Rukiye Öztürk; Ismailov, Zameddin İ. (Ankara Üniversitesi Fen Fakültesi, 2019-02-01)
      In the present paper, the aim is to described all selfadjoint extensions of the minimal operator generated by first order linear symmetric multipoint quasi-differential operator expression in the direct sum of weighted ...

    • Newinequalities in terms of operator m-convex functions in Hilbert space 

      Ünlüyol, Erdal; Erdaş, Yeter; Salaş, Selen (Ankara Üniversitesi Fen Fakültesi, 2019-02-01)
      In this study, we obtained some new inequalities via operator m-convex functions. Afterwards, we generalized and revised some theorems and lemmas in operator m-convex functions.

    • Null Curves of Constant Breadth in Minkowski 4-Space 

      Altunkaya, Bülent; Aksoyak, Ferdağ Kahraman (Ankara Üniversitesi, 2019-02-01)
      In this paper, we define null curves of constant breadth in Minkowski 4-space and obtain a characterization of these curves. Also we give an example for such curves.

    • Numerical Solutions of Time Fractional Korteweg--de Vries Equation and Its Stability Analysis 

      Yokuş, Asıf (Ankara Üniversitesi, 2019-02-01)
      In this study, the fractional derivative and finite difference operators are analyzed. The time fractional KdV equation with initial condition is considered. Discretized equation is obtained with the help of finite difference ...

    • On a new subclass of bi-univalent functions satisfying subordinate conditions 

      Altınkaya, Şahsene; Mazı, Emeka (Ankara Üniversitesi Fen Fakültesi, 2019-02-01)
      The purpose of our present paper is to introduce a new subclass of bi-univalent functions associated with pseudo-starlike function with Sakaguchi type functions and to determine the coefficient estimates |a₂| and |a₃| for ...