نتایج جستجو برای: layer model

تعداد نتایج: 2328029  

حسین مرادی, ,

  In this paper a simple model calculation of spin wave is given for the ferromagtic layer in ultra thin ferromagnetic/antiferromagnetic bilayer. In this model the magnetic layer is assumed as an isolated layer but the effect of antiferromagnetic layer on ferromagnetic layer and unidirectional anisotropy, is given in the effective field applied on each spin. The thin layer is assumed as two-dim...

Journal: :journal of theoretical and applied vibration and acoustics 0
ali mokhtari department of mechanical engineering, isfahan university of technology, isfahan 84156-83111, iran vahid sarvestan department of mechanical engineering, isfahan university of technology, isfahan 84156-83111, iran hamid reza mirdamadi department of mechanical engineering, isfahan university of technology, isfahan 84156-83111, iran

in this article, vibration analysis of an euler-bernoulli beam resting on a pasternak-type foundation is studied. the governing equation is solved by using a spectral finite element model (sfem). the solution involves calculating wave and time responses of the beam. the fast fourier transform function is used for temporal discretization of the governing partial differential equation into a set ...

Journal: :international journal of advanced design and manufacturing technology 0
ahad zarghami mohamad javad maghrebi jalal ghasemi

in this paper, a viscous flow simulation is presented using the lattice boltzmann equation (lbe). a finite volume approach is adapted to discretize the lbe on a cell-centered, arbitrary shaped, rectangular tessellation. the formulation includes upwind scheme and high order descretization schemes for the flux term and collision operator respectively. a consistent open and solid boundary treatmen...

Journal: :فیزیک زمین و فضا 0
مجید مزرعه فراهانی استادیار، گروه فیزیک فضا، مؤسسه ژئوفیزیک دانشگاه تهران، ایران علی جلالی دانشجوی دکتری، دانشکده فیزیک، دانشگاه وسترن اونتاریو، کانادا محمدعلی ثقفی دانش آموخته کارشناس ارشد هواشناسی، گروه فیزیک فضا، مؤسسه ژئوفیزیک دانشگاه تهران، ایران

turbulent fluxes in the atmospheric boundary layer are calculated using different models. one of the most popular and operational models in this groundwork is the second order turbulent model of mellor and yamada that has been widely used to simulate the planetary boundary layer (pbl). despite its popularity, it has been shown that this model has several weeknesses that affect its accuracy. the...

In this paper, we present a multi-formalism modeling framework (abbreviated by MFMF) for modeling and simulation. The proposed framework is defined based on the concepts of meta-models and uses object-orientation to overcome the complexities and to enhance the extensibility. The framework can be used as a basis for modeling by various formalisms and to support model composition in a unified man...

In this paper, we present a multi-formalism modeling framework (abbreviated by MFMF) for modeling and simulation. The proposed framework is defined based on the concepts of meta-models and uses object-orientation to overcome the complexities and to enhance the extensibility. The framework can be used as a basis for modeling by various formalisms and to support model composition in a unified man...

G.R Jahanfarnia

The development of the mathematical model of mass transfer and diffusion process can determine the behavior of dissolved impurities in the flow boiling within viscous sublayer. Application of a new model to calculate the distribution of dissolved impuritiesconcentration within viscous sublayer and estimation of its thickness based on heat conduction layer and evaporation layer (macro-microlayer...

Journal: :international clinical neurosciences journal 0
seifollah gholampour young researchers and elite club, tehran north branch, islamic azad university, tehran, iran keyvan hajirayat m.sc. student of biomechanical engineering, department of biomedical engineering, north tehran branch, islamic azad university, tehran, iran. armin erfanian b.sc. student, department of engineering, north tehran branch, islamic azad university, tehran, iran. ali reza zali md, professor of neurosurgery, shohada tajrish neurosurgical center of excellence, functional neurosurgery research center, shohada tajrish hospital, shahid beheshti university of medical sciences, tehran, iran. ehsan shakouri ph.d. assistant professor of mechanical engineering, department of manufacturing engineering, islamic azad university- north tehran branch, tehran, iran

background: motorcycle accidents and sport accidents lead yearly to many head injuries like head fractures and concussion. so finding the most proper helmet for reducing the injuries to head can be very helpful for head protection in such cases. methods: after 3d modeling of the helmet and head and meshing the model, a compressive impacting load of 1.31mpa was exerted on head and the model was ...

Spherical pellets of antimony sulphide were dissolved in 1 molar sodium hydroxide solutions at different temperatures. It was found that the shrinking core with ash layer model could satisfactorily explain the dissolution process. Using this model it was found that initially the rate controlling step is a chemical reaction with activation energy of 10.2 kJ/mol. As the ash layer builds up, diffu...

The objective of this work is to develop deep theoretical methods that are based on the solution of the integral boundary layer equations for investigating film cooling in liquid rocket engine. The integral model assumes that heat is transferred from hot free stream gas to the liquid film both by convection and radiation. The mass is transferred to the free srteam gas by the well-known blowing ...

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