Volume 6, Issue 2

 

ارسال های اخیر

  • Hyper-tubes of hyper-cubes 

    Parvan-Moldovan, Atena؛ Diudea, M (University of Kashan, 2015-10-01)
    Hyper-tubes consisting of hyper-cubes of n-dimensions were designed and formulas for substructures of vary dimensions established.

  • A nonstandard finite difference scheme for solving‎ ‎fractional-order model of HIV-1 infection of‎ ‎CD4^{+} t-cells 

    Zibaei, Sadegh؛ Namjoo, Mehran (University of Kashan, 2015-10-01)
    ‎In this paper‎, ‎we introduce fractional-order into a model of HIV-1 infection of CD4^+ T--cells‎. ‎We study the effect of ‎the changing the average number of viral particles $N$ with different sets of initial conditions ...

  • Open problems for equienergetic graphs 

    Gutman, Ivan (University of Kashan, 2015-10-01)
    The energy of a graph is equal to the sum of the absolute values of its eigenvalues. Two graphs of the same order are said to be equienergetic if their energies are equal. We point out the following two open problems for ...

  • Edge-decomposition of topological indices 

    Gutman, Ivan (University of Kashan, 2015-10-01)
    The topological indices, defined as the sum of contributions of all pairs of vertices (among which are the Wiener, Harary, hyper–Wiener indices, degree distance, and many others), are expressed in terms of contributions ...

  • M-polynomial and degree-based topological indices 

    Deutsch, Emeric؛ Klavžar, Sandi (University of Kashan, 2015-10-01)
    Let $G$ be a graph and let $m_{ij}(G)$, $i,jge 1$, be the number of edges $uv$ of $G$ such that ${d_v(G), d_u(G)} = {i,j}$. The {em $M$-polynomial} of $G$ is introduced with $displaystyle{M(G;x,y) = sum_{ile j} m_{ij}(G)x^iy^j}$. ...

  • The reliability Wiener number of cartesian product graphs 

    Rupnik Poklukar, Darja؛ Zerovnik, Janez (University of Kashan, 2015-10-01)
    Reliability Wiener number is a modification of the original Wiener number in which probabilities are assigned to edges yielding a natural model in which there are some (or all) bonds in the molecule that are not static. ...

  • Trigonometrically fitted two-step obrechkoff methods for the numerical solution of periodic initial value problems 

    Shokri, Ali؛ Shokri, Abbas Ali؛ MOSTAFAVI, SHABNAM؛ saadat, hosein (University of Kashan, 2015-10-01)
    In this paper, we present a new two-step trigonometrically fitted symmetric Obrechkoff method. The method is based on the symmetric two-step Obrechkoff method, with eighth algebraic order, high phase-lag order and is ...

  • A note on connectivity and lambda-modified Wiener index 

    Gao, Wei؛ Gao, Yun (University of Kashan, 2015-10-01)
    In theoretical chemistry, -modified Wiener index is a graph invariant topological index to analyze the chemical properties of molecular structure. In this note, we determine the minimum -modified Wiener index of graph ...

  • The maximal total irregularity of some connected graphs 

    Eliasi, Mehdi (University of Kashan, 2015-10-01)
    The total irregularity of a graph G is defined as 〖irr〗_t (G)=1/2 ∑_(u,v∈V(G))▒〖|d_u-d_v |〗, where d_u denotes the degree of a vertex u∈V(G). In this paper by using the Gini index, we obtain the ordering of the total ...

  • Photoluminescence quantitative analysis of Gallic acid and Caffeine in green tea using multi-way chemometric approaches 

    Masoum, Saeed؛ Heshmat, Shirin (University of Kashan, 2015-10-01)
    Green tea is considered as a dietary source of antioxidant nutrients, which acts upon human health. Green tea leaves contain three main components in the form of simple hydroxy benzoic acids such as gallic acid, propyl ...