Volume 5, 1-2

 

ارسال های اخیر

  • Computing two types of geometric-arithmetic indices of some benzenoid graphs 

    Loghman, Amir؛ Saheli, Mahboobeh (Shahid Rajaee Teacher Training University, 2015-07-01)
    The geometric-arithmetic index is a topological index was defined as $GA(G)=sum{uvin E(G)}frac{2sqrt{d_ud_v}}{d_u+d_v}}$, where du denotes the degree of vertex u in G. By replacing instead $delta_u=sum_{vcong ...

  • A survey on Hosoya polynomial of some nano tubes and nano tori 

    Shabani, Hossein (Shahid Rajaee Teacher Training University, 2015-07-01)
    The Hosoya polynomial of a molecular graph G is defined as H(G,x)=∑u,vϵV(G)xd(u,v),  where the sum is over all unordered pairs {u,v} of distinct vertices in G. In this paper we arrange the main result ...

  • Symmetry of hyper-dodecahedra 

    Diudea, Mircea (Shahid Rajaee Teacher Training University, 2015-07-01)

  • Which fullerenes are stable? 

    Jalali-Rad, Maryam (Shahid Rajaee Teacher Training University, 2015-07-01)
    A fullerene is a molecule composed of carbon in the shape of a hollow sphere, ellipsoid, tube, and many other forms. The spherical ones are called buckyballs and they look like the balls used in football game. The first ...

  • Modified eccentric connectivity index of fullerenes 

    Hakimi-Nezhaad, Mardjan (Shahid Rajaee Teacher Training University, 2015-07-01)
    The eccentric connectivity index of a graph is defined as E(Γ)=∑uεV(Γ)degΓ(u)e(u), where degΓ(u) denotes the degree of the vertex u in Γ and e(u) is the eccentricity of vertex u. In this ...

  • Band gap modulation of graphyne: A density functional theory study 

    Majidi, Roya (Shahid Rajaee Teacher Training University, 2015-07-01)
    Modifying the electronic properties of graphyne via doping, organic molecule adsorption, and chemical functionalization was reviewed. The electronic band structure and density of states were studied by using density ...