Crack tip dislocations in silicon single crystals were observed by combining high-voltage electron microscopy and electron tomography. Cracks were introduced by an indentation method and dislocations were introduced around the crack tip by keeping the indented sample at high temperatures for several hours. The number of dislocations emitted from the crack tip was controlled by changing the hold...

dislocation of the thumb carpometacarpal joint is a rare injury, and only 38 cases have been definitively described in the english-speaking literature. all the reported dislocations have been dorsal. we present a volar form of the thumb carpometacarpal dislocation which was managed surgically after three months from the injury with open reduction and volar ligament reconstrction, with satisfact...

The effect of aging (at 773 K for 1 h) on the cyclic stability superelasticity was studied in preliminarily quenched (after annealing at 1448 Ni44Fe19Ga27Co10 [001]-oriented single crystals. It shown that NiFeGaCo crystals (both and aged) exhibited highly stable during more than 105 loading/unloading cycles compression without destruction. degradation curves divided into stages, each stage care...

In a model for rotating non-Boussinesq convection with mean flow, we identify a regime of spatiotemporal chaos that is based on a hexagonal planform and is sustained by the induced nucleation of dislocations by penta-hepta defects. The probability distribution function for the number of defects deviates substantially from the usually observed Poisson-type distribution. It implies strong correla...

We report high-resolution transmission electron microscopy (HRTEM) observation of a high density of dislocations with edge components (;10 m ) in nanocrystalline (NC) body-centered cubic (bcc) Mo prepared by high-pressure torsion. We also observed for the first time of the 1⁄2,111. and,001. pure edge dislocations in NC Mo. Crystallographic analysis and image simulations reveal that the best way...

In a model for rotating non-Boussinesq convection with mean flow we identify a regime of spatiotemporal chaos that is based on a hexagonal planform and is sustained by the induced nucleation of dislocations by penta-hepta defects. The probability distribution function for the number of defects deviates substantially from the usually observed Poisson-type distribution. It implies strong correlat...