Sharif Digital Repository

Steel Concentrically Braced Frames are common lateral load resisting frames. Poor design of this system can lead it to premature failure of braces. This failure may be due to non-elastic buckling of brace members or their connections. Design Codes divide Concentrically Braced frames into two groups: Ordinary Concentrically Braced Frames and Special Concentrically Braced Frames and for each, specific limitations have been determined for width to thickness ration and slenderness. Many of these limitation have been obtained on the basis of experimental tests. In this thesis steel braces behavior under cyclic loading is studied. For parametric investigation, Finite Element Method is used. Abaqus... 

Hydrogels are three-dimensional polymeric networks capable of absorbing significant amounts of water. Recently, hydrogels based on acrylic monomers have garnered significant attention from researchers for the fabrication of motion sensors that monitor body movements, owing to their inherent ionic conductivity, remarkable flexibility, and biocompatibility. However, one of the common limitations of these hydrogels for practical applications is their inadequate mechanical properties. In this study, hydrophobic physical crosslinks formed from micelles of hydrophobic monomers and coordination-based physical crosslinks induced by trivalent iron ions (Fe³⁺), along with tannic acid (TA)-modified... 

Magnetic Resonance Imaging ,MRI, although as one of the most advanced medical imaging equipment is well known but compared to other medical imaging systems needs more time to imaging, so it has caused the patient dissatisfaction. According to the recently researches, filling the image data in a space of information that called ‘k-space’, in the process of image reconstruction, is the main reason of slow MRI. Image reconstruction methods for accelerating like half scan based on image reconstruction by using only a part of k-space is used in MRI systems today, but this method is associated with lower SNR image. Recent research on the theory of compressed sensing has been opened a new approach...