A methodology for the mobility evaluation and mission oriented performance assessment of an autonomous mobile robot is developed. The evaluation strategy uses both time and energy based measures resulting in the development of isochronal/isoenergy contours which characterize the expected mobility of the robot over novel terrain using sample trials on patches of land prior to the mission. This w...

North American mammals experienced a major mass extinction at the Cretaceous/Tertiary (K/T) boundary that is tied unambiguously to the Chicxulub impact event. Immediately afterwards, there was an immense adaptive radiation that greatly expanded taxonomic diversity and the range of body sizes and ecological strategies. However, ties between later, Cenozoic impact events and specific episodes in ...

Abstract The origin of organic compounds detected in meteorites and comets, some which could have served as precursors life on Earth, remains an open question. aim the present study is to make one more step revealing nature composition materials extraterrestrial particles by comparing infrared spectra laboratory-made refractory residues cometary returned Stardust mission, interplanetary dust pa...