Showing 5 results for ezati
Volume 1, Issue 1 (Spring and Summer 2024)
Abstract
As great Persian Jurists in East Muslim world in the formation and propagation of various Islamic sects involved, in the West muslim world and Afriqia of the generation of Khorasani immigrants grew great Jurists and The establishment and spread of the Islamic religions, especially the religion of Hanafi and Maliki contributed. Resources and translation and stories in books and the works of many Persian Jurists come,and Most names with the suffix "Alfarsy" are mentioned. In fact, the titles indicating their origin and being Iranian, That are distinguished with others. This article seeks to explain the real role and status in shaping and promoting the Islamic religious by Persian Jurists in the Africaia. Relying on library sources and with a historical approach and descriptive method, efforts will be made to clarify the contribution and influence of Iranian scientists and scholars in the expansion and growth of Islamic religions in the Islamic Maghreb, especially in the African region.
Volume 7, Issue 4 (Fall 2019)
Abstract
Volume 10, Issue 4 (1-2011)
Abstract
This paper presents a new method called vespiary regular hexagonal (VRH) model to calculate parasitic capacitance between conductor wire filaments of one turn of a coil and between conductor wires filament and liner and also total capacitance of n-turns having single-layers, multi-conductor wire filaments of the helix magneto cumulative generator (MCG) coil. The presented method is an analytical method and based on the geometrical structure of single-layer multi-conductor wire filaments with circular cross-section form in a turn of MCG coil. In this method, wire filaments of the MCG coil are divided into many very small similar elementary cells. In this structure, an equilateral lozenge shaped basic cell with two trapezium shaped regions is considered between the two adjacent conductor wire filaments in each turn of the MCG coil. This method can be applied to calculate stray capacitance of n-turns of coil with multi conductor wire filaments having the circular cross-sections and wires filament in each turn of the generator coil having wounded around linear and uniform in multi-layers in the hollow circular form and with a certain distance from the surface of the cylindrical metal liner which is placed axially in the center of the coil. Also it is seen that by the progress of the explosion and volume extension of liner and decrease of the number of MCG coil turns up to the second end turn, the total capacitance of generator increases and when it remains only one turn in the circuit, a descending decrease in total capacitance of the generator occurs.
Volume 15, Issue 6 (8-2015)
Abstract
In this article, the significance of utilizing active toe joints in biped robots feet is examined. The main goal of this research is to employ active toe joints and heels to improve gait performance from two points of view: actuating torques of knee joints and total consumed energy. Considering the effectiveness of toes and heels in walking, a new walking pattern is fully addressed and compared with another walking pattern which does not exploit toes and heels. In order to develop a verified dynamics model for considered humanoid robot with 22 DoFs, two analytical methods i.e. Lagrange and Kane are adopted and the obtained results are compared. To reduce calculation burden, an iterative method for dynamics model development is proposed, based on Kane approach. Furthermore, to verify the obtained ground reaction forces and moments, ZMP is computed and compared using two methods. In the procedure of gait planning, first the pelvis trajectory is planned. Then, the feet trajectory planning process is done. After designing trajectory in task space, all joint trajectories except the trajectories of toes are obtained, using closed-form inverse kinematics solution. Toe joints trajectories are planned separately, considering the sole trajectories. Consequently, the significant parameters in gait planning are considered as design variables in optimization procedure in order to reduce the maximum torque of knees and total consumed energy as cost functions. Finally, it is demonstrated that which walking pattern is highly appropriate for walking with large step length on flat terrain, under joint torque and velocity limitations.
Volume 18, Issue 1 (3-2018)
Abstract
The present study investigates the thermal response of individuals whose forearms were subjected to severe cold stimulation and how it is influenced by the personal and physiological characteristics. So, the hands’ transient thermal responses of 89 individuals (male) was observed by thermography imaging technique. Then, statistical analysis was employed to establish an experimental relationships to estimate the thermal response time of the subjects with different individual and physiological conditions. The results showed that among the 9 individual and physiological parameters (age, vascular fat, muscle percentage, fat percentage, body mass index, systolic blood pressure, diastolic blood pressure, heart rate and fasting time), only four independent parameters including internal fat, body mass index, systolic blood pressure and fasting time are significant related to the response time. Also, using multivariate linear regression, a relationship was developed to estimate the thermal response time of the subjects against cold stimulation. This relationship indicates that the response time of the obese can be up to 20% higher than that of the lean subjects. In addition, the results shows that for each one hour after the last meal, the thermal response of the body is slower about 1%.