the main purpose of this study was to identify factors affecting the validity of the results of the student evaluation. the research method was mixed method. participants of the qualitative part were masters of educational science and participants of the quantitative part were bsc students of psychology and educational sciences of state universities of tehran entered in 1389 and 1390. in the qu...

roy adaptation model in hemodialysis patients: a mixed method research hassani p[1]*, otaghi m[2] received: 17 may, 2012 accepted: 13aug, 2012 abstractbackground & aims: ram is used in ersd patients. nurses play important role in their adaptation. the goal of the study is to explain the adaptive and ineffective responses of hemodialysis patients based on ram in qualitative part, and to compare ...

In this article the nonlinear mixed Volterra-Fredholm integral equations are investigated by means of the modied three-dimensional block-pulse functions (M3D-BFs). This method converts the nonlinear mixed Volterra-Fredholm integral equations into a nonlinear system of algebraic equations. The illustrative   examples are provided to demonstrate the applicability and simplicity of our   scheme.    

the cracked brazilian disc (cbd) specimen is widely used in order to determine mode-i/ii and mixed-mode fracture toughness of a rock medium. in this study, the stress intensity factor (sif) on the crack-tip in this specimen is calculated for various geometrical crack conditions using the extended-finite element method (x-fem). this method is based upon the finite element method (fem). in this m...

the aim of this work is to investigate the variational discretization and mixed finite element methods for optimal control problem governed by semi linear parabolic equations with integral constraint. the state and co-state are approximated by the lowest order raviart-thomas mixed finite element spaces and the control is not discreted. optimal error estimates in l2 are established for the state...

although some piecemeal efforts have been made to investigate the validity and use of the iranian phd exam, no systematic project has been specifically carried out in this regard. the current study, hence, tried to attend to this void. as such, to ensure a balanced focus on test interpretation and test consequence, and to track evidence derived from a mixed–method study on the validity of irani...

in this paper, conjugate heat transfer of magneto hydrodynamic mixed convection of nanofluid about a vertical slender hollow cylinder embedded in a porous medium with high porosity have been numerically studied. the forchheimer’s modification of darcy’s law was used in representing the nanofluid motion inside the porous media. the governing boundary layer equations were transformed to non-dimen...

the paper is concerned with a methodology of optimal design of shells of minimum weight with strength, stability and strain constraints. stress and strain state of the shell is determined by galerkin method in the mixed finite element formulation within the geometrically nonlinear theory. the analysis of the effectiveness of different optimization algorithms to solve the set problem is given. t...

ZnFe2O4 mixed spinel ferrite nanoparticles obtained through a citrate-nitrate combustion method. Ignited products calcined at different temperatures in 600-900ºC range and effect of calcination treatment temperature investigated. Final Products characterized by X-ray Diffraction (XRD), Fourier-Transform Infrared spectroscopy (FTIR), and Field Emission Scanning Electron Microscopy (FESEM). The a...