during the last few decades cereals yield have increased drastically at the national level however, information about yield stability and its resistance to annual environmental variability are scare. in this study long term stability of grin yield of wheat, barley, rice, corn and overall cereals in iran were evaluated during a 40-year period (1971-2011). stability analysis was conducted using t...

background: the objective of this study was to determine the residual concentrations of ethion and imidacloprid in cucumbers grown in greenhouse. the effect of some simple processing procedures on both ethion and imidacloprid residues were also studied. methods: ten active greenhouses that produce cucumber were randomly selected. ethion and imidacloprid as the most widely used pesticides were m...

Four residuals in the MLNM(A1B1C1 + A2B2C2) are defined. The estimated model which is obtained by using the maximum likelihood theory is considered. The vec operator is applied to the estimated model and it turns out that the estimated model is the projection of the observations on the space generated by the design matrices which is the sum of two tensor product spaces. The estimated model is s...

We introduce a formal language to describe origin functions, which permit to study the notions of descendance and residuals in reduction systems. Computation on this formal language are deened using a term rewriting system, which we show to be canonical. This work has application in semantics and debugging.

Phase space reconstruction is investigated as a diagnostic tool for determining the structure of detected nonlinear processes in regression residuals. Empirical evidence supporting this approach is provided using simulations from an Ikeda mapping and the S&P 500. Results in the form of phase portraits (e.g., scatter plots of reconstructed dynamical systems) provide qualitative information to di...