studies by the us salinity laboratory, using gapon rule, led to the value of 0.01475 (mmol l-1)-0.5for the modified gapon selectivity coefficient (k'g). nevertheless, the results of subsequent research reveled that k'g isn’t constant and could take on a wide range of values depending on soil properties. the aim of this study was to determine the relationship between exchangeable sodiu...

A general adsorption model able to provide a good description of the multilayer ions and molecular compounds under any circumstances is proposed in this paper. In order reach goal, form isotherm was deduced based on Gapon equation classical forms. The with diverse hydrophobicity acid-base characteristics were investigated validated new for four pesticides different soils. capacity energy estima...

In order to accurately model soil reclamation with concentrated electrolytes such as CaCl2 or sea water, it must be determined if there is an effect of salinity on the Na-Ca exchange selectivity. A new procedure for determining Na-Ca selectivity in calcareous and gypsiferous soils was used to study the effects of ionic strength and mineralogy on Na-Ca exchange. Four specimen clay minerals and t...

Fuzzy Newton-Cotes method for integration of fuzzy functions that was proposed by Ahmady in [1]. In this paper we construct error estimate of fuzzy Newton-Cotes method such as fuzzy Trapezoidal rule and fuzzy Simpson rule by using Taylor's series. The corresponding error terms are proven by two theorems. We prove that the fuzzy Trapezoidal rule is accurate for fuzzy polynomial of degree one and...

This work treats the case of expert-originated hypotheses which are to be modified or refined by training event data. The method accepts the hypotheses in the form of weighted VL, expressions and uses the probabilistic rule generator, PRG. The theory of operation, verified by experimental results, provides for any degree of hypothesis modification, ranging from minor perturbation to complete re...