A reactive distillation column in general can exhibit multiple steady states which reduce column operability and controllability during perturbations of manipulated variables and particularly during start-up and shut down. The objective of this paper was to compare the equilibrium (EQ) and nonequilibrium (NEQ) models of a reactive distillation column, focusing on the phenomenon of multiple stea...

Emphasis on milk yield (MY) as well as milk yield persistency (MYP) and calving interval (CI) is necessary to achieve more sustainable productionin dairy cattle. Therefore the main objective of this study was to find an optimum regression model to estimate economic values for MY, MYP and CI.Using a deterministic bio-economic model, seventyfiveproduction states differing mainly in MY, MYPand CIw...

in this work, artificial neural network (ann) has been employed to propose a practical model forpredicting the surface tension of multi-component mixtures. in order to develop a reliable modelbased on the ann, a comprehensive experimental data set including 15 ternary liquid mixtures atdifferent temperatures was employed. these systems consist of 777 data points generally containinghydrocarbon ...

We compare two approaches for a Markovian model in flexible manufacturing systems (FMSs) using Monte Carlo simulation. The model which is a development of Fazlollahtabar and Saidi-Mehrabad (2013), considers two features of automated flexible manufacturing systems equipped with automated guided vehicle (AGV) namely, the reliability of machines and the reliability of AGVs in a multiple AGV jobsho...

This investigation deals with a mathematical model for a distribution transformer including saturation effect. To this end, the equations related to a three phase transformer are specified and the effect of an inter-turn fault is included. Naturally by applying an inter-turn fault the inductance and resistance matrix will change. Thus, unknown quantities of inductances and resistances for compl...

We report about two new rigorous results on the non-analytic properties of thermodynamic potentials at first order phase transition. The first one is valid for lattice models (d ≥ 2) with arbitrary finite state space, and finite-range interactions which have two ground states. Under the only assumption that the Peierls Condition is satisfied for the ground states and that the temperature is suf...

the efficiency of the health care system is significantly dependent on the appropriate leadership and guidance of employees. one of the most frequently used new approaches in human resources management is the study of competencies and competency models. the aim of this research is to develop a competency model for leaders in nursing, and to compare it with the leadership competency model for st...

the aim of this study is to review the rentier state theory, with special regard to iran. iran’s rentier state is highly dependent on oil revenues, but much less on tax revenues. even this negligible reliance on tax revenues, itself seems to be indebted to oil revenues. thus the main research hypothesis is that iran’s oil revenue is one of the main determinants of tax revenues. to empirically t...