On-demand adhere to and detach from soft wet surfaces are crucial for hydrogels applications in tissue engineering, machines, robotics. Whereas strong adhesion has been achieved between hydrogels, on-demand switching weak benign detachment is still under explorations. Herein, we report an approach switchable by invoking a mechanical process, wrinkling. The demonstrated bonding two hydrogel adhe...

Stents for angioplasty have been extensively used to treat coronary diseases. The aim of this study is to analyze the expansion of the stent and the contact with the artery using tube hydroforming simulation. In the simulation, the contact stress and the final shape of the artery after stent expansion process using the Stampack (®;) software will be studied. A model of a commercial stent made o...

Wrinkling of an inextensible elastic lining inner-lined tube under imposed pressure is considered. A simple equation modeling the properties lining, pressure, and soft-substrate forces derived. This aims to capture wrinkling response arterial endothelium blood changes. Numerical continuation used construct a bifurcation diagram as function for in-plane deformations, in excellent agreement with ...

The effects of explicit flow modulation on the dispersion of a passive scalar field are studied. Broadband forcing is applied to homogeneous isotropic turbulence to modulate the energy cascading and alter the kinetic energy spectrum. Consequently, a manipulation of turbulent flow can be achieved over an extended range of scales beyond the directly forced ones. This modifies transport processes ...

A stressed thin film on a soft substrate can develop complex wrinkle patterns. The onset of wrinkling and initial growth is well described by a linear perturbation analysis, and the equilibrium wrinkles can be analyzed using an energy approach. In between, the wrinkle pattern undergoes a coarsening process with a peculiar dynamics. By using a proper scaling and two-dimensional numerical simulat...

We investigated solvent induced transition of surface instability from wrinkles to creases in poly(2-hydroxyethyl methacrylate) (PHEMA) gels with depth-wise crosslinking gradients. The mode of surface instability and morphology of surface patterns was found to be dependent on the equilibrium linear expansion, which was a function of crosslinker concentration and the solvent–polymer interaction....

The annual American Society of Plastic Surgeons’ “Plastic Surgery: The Meeting” is always filled with great educational events and endeavors, and the 2015 gathering in Boston was truly exceptional. Perhaps the most memorable and most rewarding panel that we had the honor and pleasure to be a part of was the Medical Student Session, moderated by one of the first Plastic and Reconstructive Surger...

Background A literature review did not reveal any study investigating the prevalence of depression among plastic surgery residents. Methods We conducted a cross-sectional mail survey and included all Saudi Plastic Surgery residents in our local program in Saudi Arabia. The Beck Depression Inventory II was used. Results The inventory showed that mild, moderate, and severe depressive symptoms...