Publications scientifiques: Recent submissions

  • Djellouli, Ghouti; Messirdi, Sanaa; Messirdi, Bekkai (Int. J. Contemp. Math. Sciences, 2010)
    The purpose of this paper is to introduce some new metrics on the set C(H) of closed densely defined operators on a Hilbert space H and we characterize the closure of the subset of bounded elements of C(H) for these ...
  • Gherbi, Abdellah; Messirdi, Bekkai; Benharrat, Mohammed (Funct. Anal. Approx. Comput, 2015)
    In this paper we attempt to investigate some algebraic and topological properties of quotient operators acting on Hilbert space, and to give a characterization of Fredholm quotient operator and its index.
  • Messirdi, Bekkai; Bekkara, Samir; Senoussaoui, Abderrahmane (Electronic Journal of Differential Equations (EJDE)[electronic only], 2009)
    In this paper , we introduce a class of generalized integral operators that includes Fourier integral operators . We establish some conditions on these operators such that they do not have bounded extension on L2(Rn): ...
  • Messirdi, SANAA; Djaa, MUSTAPHA; Messirdi, BEKKAI (Sarajevo J. of Math, 2009)
    We introduce the notion of almost closed linear operators acting in a Hilbert space. This class of operators contains the set of all closed linear operators and is invariant under addition, composition and limits.
  • Messirdi, Bekkai; Mortad, Mohammed Hichem; Azzouz, Abdelhalim; Djellouli, Ghouti (Colloquium Mathematicum, 2008)
    The purpose of this work is to give a topological condition for the usual product of two closed operators acting in a Hilbert space to be closed
  • Bouchekif, Mohammed; EO El Mokhtar, Mohammed (Electronic Journal of Differential Equations (EJDE)[electronic only], 2011)
    We prove the existence and multiplicity of solutions for a nonhomogeneous elliptic equation involving decaying cylindrical potential and critical exponent.
  • Messirdi, Bekkai; Senoussaoui, Abderrahmane (Canadian Journal of Physics, 2001-04-01)
    We studied the spectrum of P D −h21x − 1y C V .x; y/ on L2 􀀀 IR3n x IR3p y ; when h tends to zero; n 2; p 2 IN ; in the case where the potential V .x; y/ is singular and of Coulomb type and the first ...
  • Benharrat, Mohammed; Messirdi, Bekkai (Serdica Mathematical Journal, 2011)
    We show that the symmetric difference between the generalized Kato spectrum and the essential spectrum defined in [7] by sec(T) = {l О C ; R(lI-T) is not closed } is at most countable and we also give some relationship ...
  • Bensedik, Ahmed; Bouchekif, Mohammed (Electronic Journal of Differential Equations (EJDE)[electronic only], 2002)
    The purpose of this article is to nd positive solutions to the system 􀀀 pu = m(x)@H @ u(u; v) in 􀀀 qv = m(x)@H @ v(u; v) in (1:1) u = v = 0 on@ where is a bounded regular domain of RN; with a smooth ...
  • Messirdi, Bekkai; Senoussaoui, Abderrahmane (Electronic Journal of Differential Equations, 2006-01-01)
    In this paper, we study the L 2-boundedness and L2-compactness of a class of Fourier integral operators. These operators are bounded (respectively compact) if the weight of the amplitude is bounded (respectively tends to 0).
  • Benharrat, Mohammed; Ammar, Aymen; Jeribi, Aref; Messirdi, Bekkai (Functional Analysis, Approximation and Computation, 2015-02-16)
    In this paper, we give some properties of the semi-regular, essentially semi-regular and the operators of Kato type on a Banach space. We also show that the essentially semi-regular spectrum of closed, densely defined ...
  • Bensedik, Ahmed; Bouchekif, Mohammed (Applied mathematics letters, 2007-04-01)
    This work deals with the existence and symmetry of positive solutions for a Neumann boundary value problem. It is a generalization of the work of Pedro J. Torres. The main result is the uniqueness of positive solutions, ...
  • Messirdi, Bekkai (Annales de l'IHP Physique théorique, 1994)
    On étudie l’opérateur P=-h2 Ox-Dy+ Y (x,~/) sur R~ x R~ lorsque h tend vers 0, et V est un potentiel régulier. On se place dans un cas où deux niveaux électroniques se croisent dans la zone classiquement interdite, et où ...
  • Bouchekif, M; Matallah, A (Applied Mathematics Letters, 2009-02-01)
    In this paper, we establish the existence of multiple positive solutions for elliptic equations involving a concave term and critical Sobolev Hardy exponent.
  • ATTOUTI, Salima (2013)
    In the present work, two marine algae namely Ulva lactuca and Cystoseira stricta, were chemically midified by HCl, CaCl2 and H3PO4 in order to obtain adsorbants capable of removing two hazardous cationic dyes from wastewaters. ...
  • Miliani, Hadj (Cahiers d’études africaines, 2002-01-01)
    À travers le cas de la chanson rap qui s’est développée en Algérie au cours des années 1990, cet article tente de décrire quelques effets de l’interaction entre expressions culturelles transnationales et pratiques symboliques ...
  • De Bruycker, Philippe; Di Bartolomeo, Anna; Fargues, Philippe (2013)
    On 3 October 2013, 366 migrants drowned when their boat sank less than a mile off the shore of the Italian island of Lampedusa. A number of questions must be addressed in finding the best policy response to this tragedy. ...
  • Lilian Tsourdi, Evangelia; De Bruycker, Philippe (2015)
    The European asylum system is a relatively advanced regional protection framework, in both legislative and policy terms. However, that same system lacks a mechanism to distribute responsibility fairly among the Member ...
  • Daoudi, Bouziane; Miliani, Hadj (FeniXX, 1996)
    Le 4 septembre 1994, cheb Hasni, l’un des chanteurs les plus populaires de la chanson raï, est assassiné dans son quartier natal à Oran. Ce meurtre et d’autres projettent le raï dans l’actualité politique. C’est de la vie ...
  • Nawel, MOUSSA (2012)
    In our laboratory SEA2M , we develop activated carbon obtained from biomasse in water traitement. The behavior of activated carbon is studied using FT-IR transmission spectroscopy. The aim of this work is to,introduce this ...

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