In this paper we introduce a formula to compute Chern classes of fibered products of algebraic surfaces. For f : X → CP a generic projection of an algebraic surface, we define Xk for k ≤ n (n = deg f) to be the closure of k products of X over f minus the big diagonal. For k = n (or n − 1), Xk is called the full Galois cover of f w.r.t. full symmetric group. We give a formula for c 1 and c2 of X...

there are different models for mapping and evaluation of desertification condition, such as global fao_unep model. there are also several models for evaluation of desertification in iran. in this study, tow fol/owing methods was used: 1-icd method, (iranian classification of desertification). 2- micd method, (modified iranian classification of desertification). in this research, at first, these...

Soil physical properties have an important role on vegetation growththrough affecting the development of root system. The aim of this study was toinvestigate the trampling effect of livestock grazing on soil physical properties andvegetation cover changes. The experiment was conducted on three range conditionsites (Reference, Key and Critical area) with ten frequencies in HosseinabadeKudistan i...

The idea is growing among educators that thinking skill needs to be given a direct attention. On one hand, critical thinking is supposed to broaden students’ thinking in all regards (Schafersman, 1991); and on the other hand learners’ attitudes towards the second language can affect both their performance in the class and their final accomplishment. To this end, the present study started with t...

The influences of spatial frequency distributions on complete amplitude death are explored by studying an array of diffusively coupled oscillators. We found that with all possible sets of spatial frequency distributions, the two critical coupling strengths ε(c1) (lower-bounded value) and ε(c2) (upper-bounded value) needed to get complete amplitude death exhibit a universal power law and a log-n...