Scaling of hypervelocity impact craters in ice with impact angle

Morphology and scaling of impact craters in granular media.

We present the results of experiments on impact craters formed by dropping a steel ball vertically into a container of small glass beads. As the energy of impact increases, we observe a progression of crater morphologies analogous to that seen in craters on the moon. We find that both the diameter and the depth of the craters are proportional to the 1/4 power of the energy. The ratio of crater ...

the impact of e-readiness on ec success in public sector in iran the impact of e-readiness on ec success in public sector in iran

acknowledge the importance of e-commerce to their countries and to survival of their businesses and in creating and encouraging an atmosphere for the wide adoption and success of e-commerce in the long term. the investment for implementing e-commerce in the public sector is one of the areas which is focused in government‘s action plan for cross-disciplinary it development and e-readiness in go...

Excavation of Subsurface Ice on Mars by New Impact Craters

das, M.R. Kennedy, M. Mellon, D. Shean, I. Daubar, S. Cull, K.D. Seelos, S. Murchie, B. Cantor, R.E. Arvidson, K. Edgett, A. McEwen, T. Harrison, L. Posiolova, F.P. Seelos and the HiRISE, CTX and CRISM teams. Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ; Malin Space Science Systems, San Diego, CA; Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder...

Ice-associated Impact Craters on Mars: Implications from Mola Observations

Hypervelocity Impact on Rock

Concerted research efforts are being made to find new means of rock disintegration for more rapid, efficient excavation. Water jets, metallic jets and hypervelocity projectiles have been found to cut or break rock with varying degrees of efficiency depending upon several parameters, which are being defined by research in Russia, Britain and the United States. Optimum performance of high velocit...