Surface pressure measurements on Mars have revealed a wide variety of atmospheric phenomena. The Science Laboratory Rover Environmental Monitoring Station sensor data set is now the longest duration record surface Mars. We use first 2580 Martian sols, nearly 4 years, to identify waves with periods tens minutes hours using wavelet analysis residual after tidal harmonics are removed. find these c...

This study examines the capability of the Relevance Vector Machine (RVM) and Multivariate Adaptive Regression Spline (MARS) for prediction of ultimate capacity of driven piles and drilled shafts. RVM is a sparse method for training generalized linear models, while MARS technique is basically an adaptive piece-wise regression approach. In this paper, pile capacity prediction models are developed...

In the present study, the multivariate adaptive regression splines (MARS) technique is employed to estimate the drying shrinkage of concrete. To this purpose, a very big database (RILEM Data Bank) from different experimental studies is used. Several effective parameters such as the age of onset of shrinkage measurement, age at start of drying, the ratio of the volume of the sample on its drying...

Shallow dike intrusion and widening was proposed several decades ago as a cause of surface faulting and graben formation on Earth. This hypothesis was subsequently applied to the spectacular linear and/or radial graben systems visible on Mars. However, a recent study has suggested that shallow dike intrusion on Mars results in contractional folding and uplift adjacent to dike walls rather than ...

Bacteria in Simulated Martian Conditions. M. Silver; S. Mora, M. Ivey, and V. Chevrier, Arkansas Center for Space and Planetary Sciences at the University of Arkansas. 332 N Arkansas Ave., Fayetteville, AR 72701. [email protected], The University of Arkansas Department of Biological Sciences. 1 University of Arkansas, Fayetteville, AR 72701. [email protected], The University of Arka...

The history of rivers on Mars is an important constraint Martian climate evolution. timing relatively young, alluvial fan-forming especially important, as Mars' Amazonian atmosphere thought to have been too thin consistently support surface liquid water. Previous regional studies suggested that fans formed primarily between the Early Hesperian and Amazonian. In this study, we describe how a com...

Reaction behaviors and kinetics of catalytic oxidation of toluene with different feed flows over Pt/Zr(x)-HMS catalysts with Si/Zr ratio equal to 5, 10, 20 and 35 were investigated over a wide temperature range (200 – 500 oC). Results show that Pt/Zr(x)-HMS performs more easily toluene oxidation. The kinetic data were fitted by the Power-law and Mars–van Krevelen kinetic models. The fitting res...

A mission scenario is proposed, where a large number of centimeter-scale femto-spacecraft are dispersed from CubeSat piggyback payload on future Mars mission. This swarm would deliver real-time massively parallel sensing throughout entry, descent, and landing with in-orbit measurements, atmospheric characterization during even surface science upon landing. Because few entry profiles exist at pr...