Zamin that has been introduced as a high level Artificial Life environment has a variety of good features that make it a general purpose ALife test bed in which different aspects of real life may be modeled and studied. In this paper we will first describe the general structures of Zamin and living mechanisms of its creatures and then we will discuss about some of our successful studies in Zami...

We analyzed the effects of gravitational unloading on muscular fatigability and the effectiveness of resistive vibration exercise to counteract these changes. Changes in knee extensor fatigability as a consequence of 8 weeks of horizontal bedrest with or without daily resistive vibration exercise were evaluated in 17 healthy male volunteers. Bedrest increased fatigability (% decrease in maximal...

Langley Research Center developed a unique test bed for investigating the practical problems associated with the assembly of large space truss structures using robotic manipulators. The test bed is the result of an interdisciplinary e ort that encompasses the full spectrum of assembly problems|from the design of mechanisms to the development of software. This paper describes the automated struc...

Surface roughness of laser powder bed fusion (L-PBF) printed overhang regions is a major contributor to deteriorated shape accuracy/surface quality. This study investigates the mechanisms behind evolution surface (Ra) in regions. The morphology result combination border track contour, adhesion, warp deformation, and dross formation, which strongly related angle (?). When 0° ? ? 15°, does not af...

This work aims at gaining novel knowledge of the mechanisms governing solids flow pattern in furnace large-scale Circulating Fluidised Bed (CFB) boilers. A fluid-dynamically down-scaled unit resembling an existing 200-MWth CFB boiler was built and validated against full-scale data. The extensive experimental campaign showed, among others, that presence or absence a dense bed governs entrainment...

Pure molybdenum produced by additive laser powder bed fusion (LPBF) processes has a coarse, epitaxially-grown columnar grain structure with cracks located at high-angle boundaries, which are embrittled through oxygen segregation. The tensile strength of these pure specimens is only 50 MPa, or 11% the metallurgically sintered, deformed, and recrystallized molybdenum. Alloying carbon can reduce c...

Ice streams drain large portions of ice sheets and play a fundamental role in governing their response to atmospheric and oceanic forcing, with implications for sea-level change. The mechanisms that generate ice stream flow remain elusive. Basal sliding and/or bed deformation have been hypothesized, but ice stream beds are largely inaccessible. Here we present a comprehensive, multi-scale study...