Time filter

Source Type

Tehran, Iran

Shahid Rajaee Teacher Training University is a public university in Tehran, Iran. It was founded in 1980. Its first president was Ghodratollahe Toorang and it was named after Mohammad Ali Rajaee, the president of the country in that time after he was assassinated. The university is located in the north of Tehran which called Lavizan.Shahid Rajaee Teacher Training University provides both undergraduate and graduate programs in seven departments for typical students and teachers hired by the Ministry of Education.The education programs of typical students are separated from teacher's education programs in order to provide professional education for each group. The University is a public university, as a result budget of education and research is provided by the government of Iran. Students are accepted into the university by Iranian University Entrance Exam which conducted by the ministry of science and technology , winning prestigious scientific awards like Khwarizmi as well as direct postgraduate programs of the ministry of science for top ranking students.The university located in Tehran; as a result accepts some top students of provincial universities as guest and transfer students in competitive situations every year. Wikipedia.

Davari S.A.,Shahid Rajaee Teacher Training University
IEEE Transactions on Industrial Electronics | Year: 2016

Finite control set model predictive control (FCS-MPC) has been accepted as an effective and feasible method in variable-speed drive applications. Considering the discrete nature of the converters and using a cost function for state selection reduce the computational burden despite of having a precise control. In this paper, FCS-MPC has been used to develop a novel method for induction motor control. Contrarily to conventional direct torque and flux control, in the proposed method, the torque and the angle between stator current and rotor flux are controlled. The fluxes are not directly controlled. This method increases the efficiency of the motor in light loads without using online optimum flux calculation. The angle control has become feasible by using FCS-MPC without imposing time-consuming calculations. Closed-loop prediction model is used to increase the precision of the angle prediction. A novel and simple gain calculation is also proposed. The proposed method has been evaluated by both simulations and experiments. © 2016 IEEE.

Bisabr Y.,Shahid Rajaee Teacher Training University
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Year: 2010

Recently, a model f (R) theory is proposed (Miranda et al. (2009)) [1] which is cosmologically viable and distinguishable from Λ CDM. We use chameleon mechanism to investigate viability of the model in terms of Solar System experiments. © 2009 Elsevier B.V. All rights reserved.

Taghiyari H.R.,Shahid Rajaee Teacher Training University
Wood Science and Technology | Year: 2011

The present study is aimed at investigating the effect of heat treatment of nano-silver-impregnated Populus nigra on weight loss, modulus of rupture (MOR), modulus of elasticity (MOE), and compression parallel to grain. Specimens were impregnated with 200 PPM water-based solution of nano-silver particles at 2.5 bar in a pressure vessel. For heat treatment, both nano-silver-impregnated and simple specimens were kept for 24 h at 45°C and then further for 24 h at 145°C and finally for 4 h at 185°C. MOR decreased from 529 to 461 kg/cm2 in heat-treated specimens; MOE and compression parallel to grain were though improved. Also, comparison between heat-treated and nano-silver-impregnated heat-treated specimens showed that there was a decrease in MOR and MOE in nano-silver-impregnated heat-treated specimens. This shows that nano-silver impregnation facilitates transfer of heat in wood and it may increase the process of degradation and pyrolysis of wood structures in deeper parts of specimens. © 2010 Springer-Verlag.

Bisabr Y.,Shahid Rajaee Teacher Training University
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2012

We consider modified theories of gravity with a direct coupling between matter and geometry, denoted by an arbitrary function in terms of the Ricci scalar. Because of such a coupling, the matter stress tensor is no longer conserved and there is an energy transfer between the two components. By solving the conservation equation, we argue that the matter system should gain energy in this interaction, as demanded by the second law of thermodynamics. In a cosmological setting, we show that although this kind of interaction may account for cosmic acceleration, this latter together with the direction of the energy transfer constrain the coupling function. © 2012 American Physical Society.

Taghiyari H.R.,Shahid Rajaee Teacher Training University
Journal of Tropical Forest Science | Year: 2012

Permeability is an important physical property of wood as a porous material that determines many of its applications. The present study was therefore aimed at analysing the effects of nanosilver impregnation on specific longitudinal gas permeability as well as two longitudinal liquid permeability, i.e. first drop time and 5-cm lowering time using Rilem tube test method. Relationship between these permeability times were analysed in three native solid wood, Populus nigra (poplar), Fagus orientalis (beech) and Carpinus betulus (hornbeam). Specific longitudinal gas permeability values obtained were 20.77 × 10 -13, 8.20 × 10 -13, 7.85 × 10 -13 and 6.10 × 10 -13 m 3 m -1 in poplar, beech, hornbeam sapwood and hornbeam heartwood respectively. Empty-cell impregnation process of nanosilver suspension not only washed out part of the extractives but also the pressure might have removed some of the tiny physical tissues and natural obstacles in vessel elements. Consequently, permeability increased by more than 50% in poplar and hornbeam heartwood which had simple perforation plates. However, permeability was decreased by 3.7% in beech. We hypothesised that this was due to first, the settlement of nanosilver particles or extractives that were dissolved in the suspension within scalariform perforation plates, thus, blocking fluid transfer process; and second, collapsing and accumulation of the scalariform perforation plates due to the high pressure in impregnation vessel. Clear direct relation was found between gas and liquid permeabilitiy. © Forest Research Institute Malaysia.

Discover hidden collaborations