Post buckling problem of a large deformed beam is analyzed using canonical dual finite element method (CD-FEM). The feature of this method is to choose correctly the canonical dual stress so that the original non-convex potential energy functional is reformulated in a mixed complementary energy form with both displacement and stress fields, and a pure complementary energy is explicitly formulat...

OBJECTIVE To study the effects of segmental scleral buckling without encircling procedures on retrobulbar hemodynamic conditions using color Doppler imaging. METHODS In 65 consecutive eyes of 65 patients with unilateral rhegmatogenous retinal detachment repaired by scleral buckling, we prospectively measured the blood flow velocities in the ophthalmic artery, central retinal artery, and short...

A bi-stable switching energy harvester made from a buckled steel structure mounted with uniaxially poled piezoelectric polyvinylidene fluoride and 3D printed polylactic acid components is constructed and tested. A data collection system and frequency sweeping program is built to drive the device using a custom compression rig fitted with an accelerometer. The energy harvester is tested with the...

We simulated the behavior of suspended carbon nanotube resonators over a broad range of temperatures to explore the physics of semiflexible polymers in underdamped environments. We find that thermal fluctuations induce strong coupling between resonance modes. This effect leads to spectral fluctuations that readily account for the experimentally observed quality factors Q ∼ 100 at 300 K. Using a...

This chapter describes the method of manufacturing microfluidic microchannels formed by delaminated buckled thin films. Thin films under compression tend to delaminate and buckle. Microchannel geometry can be controlled by tailoring film residual stress and placing patterned adhesion-weakening layers utilizing photolithographic techniques. Results based on the photoresist as the adhesion weaken...

Microtubules are hollow cylinders composed of tubulin heterodimers that stack into linear protofilaments that interact laterally to form the microtubule wall. Synchrotron x-ray diffraction of microtubules under increasing osmotic stress shows they transition to rectangular bundles with noncircular buckled cross sections, followed by hexagonally packed bundles. This new technique probes the stre...