sherpa/romeo

 

Recent Submissions

  • 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 ...
  • 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 ...
  • Quasi-subordination and coefficient bounds for certain classes of meromorphic functions of complex order 

    Zayed, H. M.; Bulut, Serap; Mostafa, A. O. (Ankara Üniversitesi Fen Fakültesi, 2019-02-01)
    In this paper, we obtain Fekete-Szegö functional |a₁-μa₀²| for functions of the classes Σ_{q}^{∗}(ϕ) and Σ_{q,λ,b}^{∗}(g,ϕ) using quasi-subordination. Sharp bounds for the Fekete-Szegö functional |a₁-μa₀²| are obtained. ...
  • Structural derivatives on time scales 

    Bayour, Benaoumeur; Torres, Delfim F. M. (Ankara Üniversitesi Fen Fakültesi, 2019-02-01)
    We introduce the notion of structural derivative on time scales. The new operator of differentiation unifies the concepts of fractal and fractional order derivative and is motivated by lack of classical differentiability ...
  • Smarandache Curves in three dimensional Lie groups 

    Değirmen, Caner; Okuyucu, O. Zeki; Yıldız, Ö. Gökmen (Ankara Üniversitesi Fen Fakültesi, 2019-02-01)
    In this paper, we introduce special Smarandache curves and obtain Frenet apparatus of a Smarandache curve in three dimensional Lie groups with a bi-invariant metric. Moreover, we give some relations between a helix or a ...
  • 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 ...
  • 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 ...
  • Reviving some geometric aspects of shrinkage estimation in linear models 

    Akdeniz, Fikri; Öztürk, Fikri (Ankara Üniversitesi Fen Fakültesi, 2019-02-01)
    It is well known that the least squares estimator is the best linear unbiased estimator of the parameter vector in a classical linear model. But, it is `too long' as a vector and unreliable, confidence intervals are broad ...
  • Output stabilization of semilinear parabolic systems with bounded feedback 

    El Alami, Abdessamad; Boutoulout, Ali; Yafia, Radouane (Ankara Üniversitesi Fen Fakültesi, 2019-02-01)
    In this paper, we will study the output feedback stabilization of infinite-semilinear parabolic systems evolving on a spatial domain Ω and in a subregion ω of Ω (interior to Ω or on its boundary ∂Ω). We consider the condition ...
  • 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 ...
  • Quasi 2-absorbing second modules 

    Ansari-Toroghy, H.; Farshadifar, F. (Ankara Üniversitesi Fen Fakültesi, 2019-02-01)
    In this paper, we will introduce the notion of quasi 2-absorbing second modules over a commutative ring and obtain some basic properties of this class of modules.
  • 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 ...
  • 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.
  • 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 ...
  • 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), ...
  • On minimal free resolution of the associated graded rings of certain monomial curves : New proofs in A⁴ 

    Zengin, Esra Emine; Mete, Pınar (Ankara Üniversitesi Fen Fakültesi, 2019-02-01)
    In this article, even if it is known for general case in <cite>sharifan-nahandi</cite>, we give the explicit minimal free resolution of the associated graded ring of certain affine monomial curves in affine 4-space based ...
  • 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].
  • Pseudo projective curvature tensor satisfying some properties on a normal paracontact metric manifold 

    Yıldırım, Ümit; Atçeken, Mehmet; Dirik, Süleyman (Ankara Üniversitesi Fen Fakültesi, 2019-02-01)
    In the present paper we have studied the curvature tensor of a normal paracontact metric manifold satisfying the conditions R(ξ,X)P=0, P(ξ,X)R=0, P(ξ,X)P=0, P(ξ,X)S=0, P(ξ,X)Z=0 and pseudo projective flatness, where R, P, ...
  • Some Caputo K-Fractional Derivatives of Ostrowski Type Concerning (n + 1)-Differentiable Generalized Relative Semi-(r; m; p; q; h1; h2)-Preinvex Mappings 

    KASHURİ, Artion; LİKO, Rozana (Ankara Üniversitesi Fen Fakültesi, 2019-02-01)
    In this article, we first presented some integral inequalities for Gauss-Jacobi type quadrature formula involving generalized relative semi-(r;m,p,q,h₁,h₂)-preinvex mappings. And then, a new identity concerning ...
  • 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 ...

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