RESUMO
This paper describes performance enhancement developments to a closed-loop pump-driven wire-guided flow jet (WGJ) for ultrafast X-ray spectroscopy of liquid samples. Achievements include dramatically improved sample surface quality and reduced equipment footprint from 7 × 20 cm2 to 6 × 6 cm2, cost, and manufacturing time. Qualitative and quantitative measurements show that micro-scale wire surface modification yields significant improvements to the topography of the sample liquid surface. By manipulating their wettability, it is possible to better control the liquid sheet thickness and to obtain a smooth liquid sample surface, as demonstrated in this work.
RESUMO
This paper presents the design of a multi-degree-of-freedom, anthropomorphic hand for transradial amputees, and also presents experimental data characterizing its performance. Unlike state-of-the-art commercially available prosthetic hands, the hand described herein is capable of providing eight canonical postures (and movement between these postures). The experimental characterization includes its capability to provide eight canonical grasp postures; the frequency response of finger motion; and its grasping force capability (as a function of finger position). Other performance specifications, such as total mass and audible noise, are also provided.