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Thermodynamic Phase Diagram and Phonon stability, Electronic and Optical Properties of FeVSb: A DFT study

Bagheri A., Boochani A., Masharian S. R., Jafarpour F. H.

Archives of Metallurgy and Materials

2023

Vol. 68, iss. 1

331--338

Mechanical, electronic, thermodynamic phase diagram and optical properties of the FeVSb half-Heusler have been studied based on the density functional theory (DFT) framework. Studies have shown that this structure in the MgAgAs-type phase has static and dynamic mechanical stability with high thermodynamic phase consistency. Electronic calculations showed that this compound is a p-type semiconductor with an indirect energy gap of 0.39 eV. This compound’s optical response occurs in the infrared, visible regions, and at higher energies its dielectric sign is negative. The Plasmon oscillations have occurred in 20 eV, and its refraction index shifts to zero in 18 eV.

Determination of kinematic parameters of a passive bipedal walking robot moving on a declined surface by image processing

Bagheri A., Alitavoli M., Hajiloo A., Basiri S., Asadi H.

Journal of Achievements in Materials and Manufacturing Engineering

2006

Vol. 16, nr 1-2

94--100

Purpose: This paper describes the design and manufacturing of the mechanisms that are able to move on a slope according to its gravity. Design/methodology/approach: After presenting the governing equations and the dynamics of the robot, a computer simulation is developed. A comparison between the results from the physical model and the results from the numerical simulation is done to check the validity of the project. Findings: This robot is able to move down on slope with a minimum tangent based on the gravity and without any controller or any supplier. Research limitations/implications: Image processing has blind nodes in some frames and can not determine node positions and at this paper a method for getting rid of that problem has been developed. Position accuracy depends on ability of processing unit. Practical implications: This method could be used for finding of kinematic parameters of each manipulator while moving. Originality/value: This paper describes a method for finding kinematic parameters of a passive robot by image processing.