We investigate the C-start escape response of larval fish by combining flow simulations using remeshed vortex methods with an evolutionary optimization. We test the hypothesis of the optimality of C-start of larval fish by simulations of larval-shaped, twoand three-dimensional self-propelled swimmers. We optimize for the distance travelled by the swimmer during its initial bout, bounding the sh...

The positive and negative terrains (P–N terrains) of the Loess Plateau China are important geographical topography elements for measuring degree surface erosion distinguishing types landforms. shoulder-lines an terrain feature in often used as a criterion P–N terrains. extraction shoulder lines is predicting recognising gully head. However, existing algorithms loess areas with insignificant slo...

I have used the SALE2D hydrocode to study spall in impacts into layered terrains. Application of my results to the problem of martiaji meteorite provenance resolves two outstanding paradoxes. First, the minimum size crater previously thought to be required to eject martian meteorites is so large (12 km) that it is highly unlikely such an event occurred on shergottite age terrain in the Icist fe...

Terrains are often modeled by triangulations and one of the criteria is that: triangulation should have “nice shape”. Delaunay triangulation is a good way to formalize nice shape. Another criterion is slope fidelity in terrains. In natural terrains there are no abrupt changes in slope. A triangulation for a terrain should use triangles of nice shape and have slope fidelity. To achieve these cha...