A novel design of a wind sensor for the surface of Mars is described. This sensor is to be included in the Rover Environment Monitoring Station (REMS) to be launched as a part of the Mars Science Laboratory in 2009. A 2D hot film anemometer composed Blouson Femme Parajumpers of four hot points and a reference point has been conceived and implemented in the preliminary design model. It uses a closed thermal feedback loop based on thermal sigma–delta modulation. In this paper, the first results obtained in a Mars-like environment are shown, and indicate that sensitivities are expected to be in the range of 0.5 m/s and 10° Doudoune Parajumpers Boutique in wind speed and direction.
A Doudoune Parajumpers Pjs model of destination choice is developed in this study employing “prospective utility” of a destination zone as its attraction measure. The prospective utility accounts for future dependency of destination choice and makes possible relevant treatment of interdependent choices in a trip chain. A parameter is included in the model to represent the magnitude of the future dependency. Empirical estimation results show that destination choice is in fact future dependent and coefficients of travel time and zonal attribute variables may be biased if this depedency is not accounted for.
The aim of this paper is to analyze fatigue properties of high strength bolts in different metallurgical conditions. M8 bolts with coarse threads were separated in seven groups, three manufactured with AISI 4135 steel and heat treated after the process of thread rolling with three tempering temperatures (TRBHT). Four groups manufactured with SCM 435H steel and same conditions. In one group, the threads were made after quenching and tempering (TRAHT). Metallographic analyses, tension, hardness, and fatigue tests were performed. All TRBHT groups presented same fatigue resistance. TRAHT group presented fatigue limit approximately 9% superior than other groups.