abstract in order to study the effects of salinity and silicon application on biomass of leaves and root of purslane (portulaca oleracea l.), a greenhouse experiment was conducted at research greenhouse of ferdowsi university of mashhad using completely randomized desgin with three replications. employed two factors consisted of three levels of salinity using nacl (0.6, 11, 22 ds/m) and two lev...

The international community has long recognized that desertifi cation is a major economic, social and environmental problem of concern to many countries in all regions of the world. The question of how to tackle desertifi cation was a major concern for the United Nations Conference on Environment and Development (UNCED), which was held in Rio de Janeiro in 1992. The Conference supported a new, ...

—A nonlinear least-squares method is presented for the identi cation of the induction motor parameters. A major dif culty with the induction motor is that the rotor state variables are not available measurements so that the system identi cation model cannot be made linear in the parameters without overparametrizing the model. Previous work in the literature has avoided this issue by making simp...

[1] Predicting the transport of reactive chemicals in subsurface porous media requires accurate adsorption models. This study compares the ability of various cation exchange models to quantitatively capture the transport behavior of major cations (i.e., calcium and sodium) in soil laboratory columns over a wide range of pore water composition. Experimental breakthrough curves were compared with...

Imbalance of sodium and potassium in patients on peritoneal dialysis (PD) is not uncommon. Sodium is the major extracellular cation; however, its concentrations are mainly affected by water balance, as well as sodium balance. Potassium is the major intracellular cation, and serum potassium concentrations are very low, compared with its intracellular components. Hyponatremia and hypokalemia are ...

groundwater is a major source of water for domestic, industrial, and agricultural sectors in many countries. the main objective of this research was to provide an overview of present groundwater quality using parameters such as calcium, magnesium, sodium, chloride, sulfate, ph, and electrical conductivity (ec) in the mehran plain, ilam province using gis and geostatistical techniques. a total o...

Cation-π interactions have been demonstrated to play a major role in agonist-binding in Cys-loop receptors. However, neither the aromatic amino acid contributing to this interaction nor its location is conserved among Cys-loop receptors. Likewise, it is not clear how many different agonists of a given receptor form a cation-π interaction or, if they do, whether it is with the same aromatic amin...

Access to the clinical information content of free text is one of the major challenges facing medical informatics today. In this study we address the problems of automatic classi cation of chest radiograph reports. For a number of independent categories we assess the e ectiveness of a K{NN classi er, and the improvement gained by prior attribute reduction using a technique grounded in rough set...