Given that the stiffness can be easily tuned by varying the crosslinking density, poly ethylene glycol) (PEG) hydrogels have been widely used as an artificial cell niche.
Given that the substratum stiffness considerably alters the corneal cell behavior, keratoprosthetics that incorporate mechanical properties simulating the native human cornea may not elicit optimal cellular performance in rabbit corneas that have dramatically different elastic moduli.
This requires the arterial wall material to be properly modeled, an issue which is complex given that the wall stiffness increases when lumen diameter increases and calcification and medial sclerosis occur with aging and in disease.
This is an important feature given that an abrupt increase in stiffness over such a junction is known to engineers to be more prone to failure due to the presence of a stress concentration.
Further, given that morning stiffness is known to be an important factor in reduced productivity and early retirement, the inclusion of drug costs only provides a potentially conservative analysis.
Given the stiffness of the silicon-based TFAs, a flexible TFA alternative is essential.
Indices for selecting materials and cross-sectional shapes that minimize the mass of beams are given for stiffness design.
One goal, for example, is to reduce the amount of lignin, a substance that gives plants the stiffness to stand upright but interferes with turning a plant's cellulose into ethanol.
"What we think may be happening is that the inner cell layer of the tendril has more lignin in it, which is a sort of glue that gives cell walls stiffness and holds together the cellulose microfibrils, which are like rebar in the cells," explains Puzey.
The results for the Kelvin-Voigt model show that for a given stiffness parameter of the foundation the critical load increases with an increase in damping and reaches a limiting value for large damping.
All models are employed to explore the effect of three-dimensional yarn crimp on the longitudinal Young's modulus, and they give at hand that the longitudinal stiffness decreases non-linearly with increasing crimp.
