1 Aim We are looking for the appropriate mathematical and computational tools for describing, studying and understanding complex chemical systems. Especially the phenomena of self-organization, structure formation , (pre-biotic) evolution and information processing in chemical or chemical-like systems need to be investigated. A constructive artiicial chemistry provides an abstract model for a c...

diffusivity equation commonly used for pressure distribution prediction in porous media results from substituting equation of state and continuity equation in navier-stokes momentum equation. from mathematical point of view this equation format shows infinite propagation speed for pressure pulse through porous media, which is physically impossible. this issue may caused by numerous assumptions ...

In this paper, we intend to solve special kind of ordinary differential equations which is called Heun equations, by converting to a corresponding stochastic differential equation(S.D.E.). So, we construct a stochastic linear equation system from this equation which its solution is based on computing fundamental matrix of this system and then, this S.D.E. is solved by numerically methods. Moreo...

Scientometric network error consequences Only very recently have researchers begun looking at what concrete effect the errors in a network model caused by name ambiguities in the data sources may have on the results of popular types of network analysis. The results that they report are quite alarming in the aggregate: not only do typical evaluative analyses of individuals (e.g., citation rankin...

Three groups that absorb in the 2100-1800-cm-1 infrared spectral region have recently been detected in Ni-hydrogenase from Chromatium vinosum [Bagley, K.A., Duin, E.C., Roseboom, W., Albracht, S. P.J. & Woodruff, W.H. (1995) Biochemistry 34, 5527-5535]. To assess the significance and generality of this observation, we have carried out an infrared-spectroscopic study of eight hydrogenases of thr...

Age at puberty has an important impact on the productive, reproductive and economic efficiency of female cattle. The occurrence of this physiological event implies an adequate growth rate and development of the animal that supports the endocrinological mechanisms that lead to sexual maturity. Age at puberty and first conception will influence lifetime productivity of cattle, reflected in the nu...

The Bering Glacier–Bagley Icefield system in Alaska is currently surging (2011). Large-scale elevation changes and small-scale elevation-change characteristics are investigated to understand surge progression, especially mass transport from the pre-surge reservoir area to the receiving area and propagation of the kinematic surge wave as manifested in heavy crevassing characteristic of rapid, br...