the main purpose of this paper is analyses the short and long run relationship between budget deficit and trade deficit in some mena countries. the data cover the period from 1971-2000 (and for i.r. iran 1 959-2003).the relationship between these variables will be analyses in short and long run by using johansen cointegration tests, ecm, and granger causality test. the empirical evidence provid...

hysteresis has been widely recognized in the soil water relationship. in this paper, a detailed review of hysteresis was performed in relation to its models. so far, different models have been suggested to describe hysteresis in the water retention curve (wrc) that could be categorized into two main groups: conceptual and empirical models. the models in the first group are based on the domain t...

Hydraulic fracturing is a phenomenon in which cracks propagate through the porous medium due to high pore fluid pressure. Hydraulic fracturing appears in different engineering disciplines either as a destructive phenomenon or as a useful technique. Modeling of this phenomenon in isothermal condition requires analysis of soil deformation, crack and pore fluid pressure interactions. In this paper...