Başlık için Cilt:68 Sayı:01 (2019) listeleme

Toplam kayıt 98, listelenen: 38-57

    • 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 ...

    • On a new variation of injective modules 

      Türkmen, Ergül; Türkmen, Burcu Nişancı; Pancar, Ali; Nebiyev, Celil (Ankara Üniversitesi Fen Fakültesi, 2019-02-01)
      In this paper, we provide various properties of GE and GEE-modules, a new variation of injective modules. We call M a GE-module if it has a g-supplement in every extension N and, we call also M a GEE-module if it has ample ...

    • On a type of α-cosymplectic manifolds 

      Beyendi, Selahattin; Ayar, Gülhan; Aktan, Nesip (Ankara Üniversitesi Fen Fakültesi, 2019-02-01)
      The object of this paper is to study α-cosymplectic manifolds admitting a W₂-curvature tensor.

    • On almost α-para-Kenmotsu manifolds satisfyıng certain conditions 

      Erken, İrem Küpeli (Ankara Üniversitesi Fen Fakültesi, 2019-02-01)
      In this paper, we study some remarkable properties of almost α-para-Kenmotsu manifolds. We consider projectively flat, conformally flat and concircularly flat almost α-para-Kenmotsu manifolds (with the η-parallel tensor ...

    • On Andersson's inequality for yyperbolically convex functions 

      FARİED, Nashat; ALİ, Mohamed S. S; YEHİA, Zeinab M. (Ankara Üniversitesi Fen Fakültesi, 2019-02-01)
      In this paper, we use Andersson's Inequality for ordinary convex functions to prove a similar inequalities concerning hyperbolically convex functions.

    • On Approximation Properties of Two Variables of Modified Kantorovich-Type Operators 

      Özhavzalı, Müzeyyen; Olgun, Ali (Ankara Üniversitesi, 2019-02-01)
      In the present paper, we introduce certain modification of Szász-Mirakyan-Kantorovich-type operators in polynomial weighted spaces of continuous functions of two variables. Then we research some approximation properties ...

    • On b-coloring of central graph of some graphs 

      Kalpana, M.; Vijayalakshmi, D. (Ankara Üniversitesi Fen Fakültesi, 2019-02-01)
      The b-chromatic number of G, denoted by ϕ(G), is the maximum k for which G has a b-coloring by k colors. A b-coloring of G by k colors is a proper k-coloring of the vertices of G such that in each color class i there exists ...

    • On commutativity of prime near-rings with multiplicative generalized derivation 

      Bedir, Zeliha; Gölbaşı, Öznur (Ankara Üniversitesi, 2019-02-01)
      In the present paper, we shall prove that 3-prime near-ring N is commutative ring, if any one of the following conditions are satisfied: (i) f(N)⊆Z, (ii) f([x,y])=0, (iii) f([x,y])=±[x,y], (iv) f([x,y])=±(xoy), (v) ...