Flag Counter

Now showing items 26-45 of 98

    • Derivatives of Sasakian metric ^{S}g on Cotangent Bundle 

      Çayır, Haşim (Ankara Üniversitesi Fen Fakültesi, 2019-02-01)
      In this paper, we define a Sasakian metric ^{S}g on cotangent bundle T^{∗}Mⁿ, which is completely determined by its action on complete lifts of vector fields. Later, we obtain the covariant and Lie derivatives applied to ...
    • Determining the most vital arcs on the shortest path for fire trucks in terrorist actions that will cause fire 

      Ayyıldız, Ertuğrul; Özçelik, Gökhan; Gencer, Cevriye Temel (Ankara Üniversitesi, 2019-02-01)
      In case of fire, the supplying of the water requirements of the fire area is a vital issue. The water requirements must be satisfied as quickly as possible without encountering any obstacles. In the study, once a terrorist ...
    • Eigenvalues and scattering properties of difference operators with impulsive condition 

      Erdal, İbrahim; Yardımcı, Şeyhmus (Ankara Üniversitesi Fen Fakültesi, 2019-02-01)
      In this work, we are concerned with difference operator of second order with impulsive condition. By the help of a transfer matrix M, we present scattering function of corresponding operator and examine the spectral ...
    • Estimation of the location and the scale parameters of Burr Type XII distribution 

      Akgül, Fatma Gül; Acıtaş, Şükrü; Şenoğlu, Birdal (Ankara Üniversitesi Fen Fakültesi, 2019-02-01)
      The aim of this paper is to estimate the location and the scale parameters of Burr Type XII distribution. For this purpose, different estimation methods, namely, maximum likelihood (ML), modified maximum likelihood (MML), ...
    • Existence of solution to a nonlocal conformable fractional thermistor problem 

      Ammi, Moulay Rchid Sidi; Torres, Delfim F. M. (Ankara Üniversitesi Fen Fakültesi, 2019-02-01)
      We study a nonlocal thermistor problem for fractional derivatives in the conformable sense. Classical Schauder's fixed point theorem is used to derive the existence of a tube solution.
    • 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 ...