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

Now showing items 1-20 of 98

    • A class of submersions and compatible maps in Finsler geometry 

      Crasmareanu, Mircea (Ankara Üniversitesi Fen Fakültesi, 2019-02-01)
      We introduce a class of submersions between two Finslerian manifolds and the class of Finsler-compatible maps which contains the previous class. Defining also the notion of stretch it follows an upper bound for the stretch ...

    • A data science study for determining food quality: an application to wine 

      Özalp, Ata Emre; Askerzade, İman (Ankara Üniversitesi Fen Fakültesi, 2019-02-01)
      In this paper, wine quality is investigated based on physicochemical ingredients which include fixed acidity, volatile acidity, citric acid, residual sugar, chloride, free sulfur dioxide, total sulfur dioxide, density, pH, ...

    • A Generalized Version of Foster and Stuart's d-statistic 

      Tanıl, Halil (Ankara Üniversitesi, 2019-02-01)
      Assume that only the lists of upper k-records and lower k-records of a finite sequence are available and the existence of a monotonic trend in location is interested in. In this study, a distribution-free test based on the ...

    • A method for solving general singular equations and its application 

      Koca, Beyaz Başak; Sadık, Nazım (Ankara Üniversitesi Fen Fakültesi, 2019-02-01)
      In this paper we present a new method for solving general singular equations of normal type. As an application of this method, we give a solution for a class of convolution-type integral equations

    • A new family of the continuous distributions: the extended Weibull-G family 

      Korkmaz, Mustafa Çagataş (Ankara Üniversitesi, 2019-02-01)
      In this study, we present a new family of continuous distributions via an extended form of the Weibull distribution. Some special members of the newly defined family are discussed and the new univariate continuous distributions ...

    • A new perspective of transmuted distribution 

      Hameldarbandı, Monireh; Yılmaz, Mehmet (Ankara Üniversitesi Fen Fakültesi, 2019-02-01)
      Regarding the concept of quadratic rank transmutation, a new distribution with convex combinations of the life distributions of two-component systems (series and parallel systems) whose component lifetimes are not identical ...

    • A new representation of constant angle surfaces in H²×R with split quaternions 

      Karakuş, Siddika Özkaldı (Ankara Üniversitesi Fen Fakültesi, 2019-02-01)
      In this paper we study surfaces in H²×R for which the unit normal makes a constant angle with the R-direction. The main idea is to show that constant angle surfaces in H²×R can be obtained by split quaternion product and ...

    • A Note On Statistical Approximation Properties of Complex q-Szász- Mirakjan Operators 

      Arı, Didem Aydın (Ankara Üniversitesi, 2019-02-01)
      The complex q-Szász-Mirakjan operator attached to analytic functions satisfying a suitable exponential type growth condition has been studied in [14]. In this paper, we consider the A-statistical convergence of complex ...

    • A Study on a Partially Null Curve in E₂⁴ 

      İyigün, Esen (Ankara Üniversitesi, 2019-02-01)
      In this paper, we study with Frenet equations which are given in [3] of a partially null curve in Semi- Euclidean 4-space E₂⁴ with index 2. By using the Frenet equations, we give some theorem and corollary. A characterization ...

    • Actions of internal groupoids in the category of Leibniz algebras 

      Şahan, Tunçar; Erciyes, Ayhan (Ankara Üniversitesi Fen Fakültesi, 2019-02-01)
      The aim of this paper is to characterize the notion of internal category (groupoid) in the category of Leibniz algebras and investigate some properties of well-known notions such as covering groupoids and groupoid operations ...

    • Actions of soft groups 

      Oğuz, Gülay; İcen, İlhan; Gürsoy, M. Habil (Ankara Üniversitesi Fen Fakültesi, 2019-02-01)
      The soft set theory proposed by Molodtsov is a recent mathematical approach for modeling uncertainty and vagueness. The main aim of this study is to introduce the concept of soft action by combining soft set theory with ...

    • Analysis and optimal control of an HIV model with logistic growth and infected cells in eclipse phase 

      HARROUDİ, Sanaa; DANANE, Jaouad; ALLALİ, Karam (Ankara Üniversitesi Fen Fakültesi, 2019-02-01)
      A mathematical model of the human immunodeficiency virus infection with logistic growth, infected cells in eclipse phase and therapy is investigated. The model includes four nonlinear differential equations describing the ...

    • Approximate controllability of neutral integrodifferential inclusions via resolvent operators 

      Tamilselvan, M. (Ankara Üniversitesi Fen Fakültesi, 2019-02-01)
      In this work, a set of sufficient conditions are established for the approximate controllability for neutral integrodifferential inclusions in Banach spaces. The theory of fractional power and α-norm is used because of the ...

    • Approximate controllability of second-order stochastic non-autonomous integrodifferential inclusions by resolvent operators 

      NİRMALKUMAR, R.; MURUGESU, R. (Ankara Üniversitesi Fen Fakültesi, 2019-02-01)
      In this paper, we formulate a set of sufficient conditions for the approximate controllability for a class of second-order stochastic non-autonomous integrodifferential inclusions in Hilbert space. We establish the results ...

    • Approximately Groups in Proximal Relator Spaces 

      İnan, Ebubekir (Ankara Üniversitesi Fen Fakültesi, 2019-02-01)
      The focus of this article is on defining descriptive approximations of sets or algebraic structures in proximal relator spaces. By way of a practical application, descriptive approximately algebraic structures such as ...

    • Assessment of supplier risk for copper procurement 

      Kara, Güray; Buzdoğan-Lindenmayr, Ezgi; Selçuk--Kestel, A. Sevtap (Ankara Üniversitesi Fen Fakültesi, 2019-02-01)
      Procurement risk management (PRM) requires a good understanding and assessment of all potential risks. As the procurement industry mostly functions globally and the supply--demand chain forms a dependency structure among ...

    • Asymptotic Behavior of the Non-Autonomous Reaction-Diffusion Equation with Robin Boundary Condition 

      Öztürk, Eylem (Ankara Üniversitesi, 2019-02-01)
      In this paper, we investigate the long-time behavior of the time-dependent reaction-diffusion equation u_{t}-Δu+a(x)|u|^{ρ}u-b(x)|u|^{ν}u=h(x,t) with Robin boundary condition. We begin this paper with the existence and ...

    • Best bound for λ- pseudo starlike functions 

      KRİSHNA, D. Vamshee; SHALİNİ, D. (Ankara Üniversitesi Fen Fakültesi, 2019-02-01)
      In this paper, we obtain sharp upper bound to the second Hankel determinant for the functions belong to the class of λ- pseudo starlike functions, an interesting sub class of univalent functions defined in the open unit ...

    • Binomial-Discrete Lindley Distribution 

      Kuş, Coşkun; AKdoğan, Yunus; Kınacı, İsmail; Karakaya, Kadir; ASGHARZADEH, Akbar (Ankara Üniversitesi, 2019-02-01)
      In this paper, a new discrete distribution called Binomial-Discrete Lindley (BDL) distribution is proposed by compounding the binomial and discrete Lindley distributions. Some properties of the distribution are discussed ...

    • Bounds for initial MacLaurin coefficients of a subclass of bi-univalent functions associated with subordination 

      MOTAMEDNEZHAD, Ahmad; NOSRATİ, Shahpour; ZAKER, Sima (Ankara Üniversitesi, 2019-02-01)
      In this paper, we investigate the bounds of the coefficients for new subclasses of analytic and bi-univalent functions in the open unit disc defined by subordination. The coefficients bounds presented in this paper would ...