When a water drop hits a superhydrophobic solid surface, it bounces off the substrate like an elastic ball. Here we show that when a tiny superhydrophobic solid sphere impacts with water, it can bounce off the free surface just as it impacts with an elastic membrane. The motion of a sinking sphere is analytically calculated by solving a potential flow whose free boundary is determined by the Yo...

The equilibrium contact angle of a droplet resting on solid substrate can reveal essential properties the solid's surface. However, when motion surface shows significant hysteresis, it is generally accepted that cannot be determined. Here, we describe method to measure tensions soft solids with strong wetting hysteresis. With independent knowledge tension fluid and linear-elastic response solid...

A JKR (Johnson-Kendall-Roberts) formalism is used to extract the Young modulus, contact radius, and energy release rate simply from retraction curve of a borosilicate glass colloidal probe polydimethylsiloxane (PDMS) surface using an atomic force microscope. PDMS samples ranged perfectly elastic those with incipient viscoelasticity. The dependence crack speed verified fracture mechanics-based m...

background substrates in medical science are hydrophilic polymers undergoing volume expansion when exposed to culture medium that influenced on cell attachment. although crosslinking by chemical agents could reduce water uptake and promote mechanical properties, these networks would release crosslinking agents. in order to overcome this weakness, silicone rubber is used and reinforced by nanocl...

It is thought that the ankle power (A2) burst observed in human gait is solely generated by rapid concentric contraction of the ankle plantar flexors. Recent work, however, suggests that the return of elastic energy may play a role. This study investigated the temporal relationship between the maximum electromyographic activity (EMG) of the ankle plantar flexors and A2. The natural gait of eigh...

The work present in this paper was developed under the PhD thesis entitled “Application of Data Mining Techniques to the Design of Jet Grouting Columns”. The main goals of this study are the developing of analytical model, by application of Data Mining (DM) techniques, able to estimate the mechanical and physical properties of Jet Grouting (JG) material, namely the evolution of uniaxial compres...

The means whereby animals adapt their locomotor behavior to variation in environmental conditions is an important and neglected problem in the area of motor control. To investigate this problem, young (3-month-old) pigtailed macaques (Macaca nemestrina) were filmed leaping a fixed distance from both rigid and elastic take-off supports. Sixteen of 17 subjects exhibited substantial invariance in ...

Twelve peripheral arteries are described in 59 patients of all ages. Accumulation of ground substance in the media, accompanied by small foci of calcification of the internal elastic lamina, was found in the large leg arteries of young adults, and progressively in a wider series of arteries throughout life. This picture showed no relationship to hypertension, to Mönckeberg's sclerosis, or to th...

One of the more interesting and contro­ versial aspects of ocular physiology in recent years has been the relative importance of parasympathetic and sympathetic portions of the autonomie nervous system on visual ac­ commodation. As early as 1801 Young pro­ posed that changes in the refractive power of the eye were brought about by changes in the radius of curvature of the crystalline lens, and ...

There is an unusual vascular network at the base of the brain in patients with moyamoya disease. We detected various histologic lesions in the perforating arteries of 22 patients. Vessels showing rupture ranged from 50 to 530 microns in diameter; they were dilated, some had fibrin deposits in the wall, fragmented elastic laminae and attenuated media. Non-ruptured perforating arteries (diameter ...