Search results for "craft"
showing 10 items of 369 documents
Two Years at Meridiani Planum: Results from the Opportunity Rover
2006
The Mars Exploration Rover Opportunity has spent more than 2 years exploring Meridiani Planum, traveling ∼8 kilometers and detecting features that reveal ancient environmental conditions. These include well-developed festoon (trough) cross-lamination formed in flowing liquid water, strata with smaller and more abundant hematite-rich concretions than those seen previously, possible relict “hopper crystals” that might reflect the formation of halite, thick weathering rinds on rock surfaces, resistant fracture fills, and networks of polygonal fractures likely caused by dehydration of sulfate salts. Chemical variations with depth show that the siliciclastic fraction of outcrop rock has undergon…
Jarosite and hematite at Meridiani Planum from Opportunity's Mossbauer Spectrometer.
2004
Mössbauer spectra measured by the Opportunity rover revealed four mineralogical components in Meridiani Planum at Eagle crater: jarosite- and hematite-rich outcrop, hematite-rich soil, olivine-bearing basaltic soil, and a pyroxene-bearing basaltic rock (Bounce rock). Spherules, interpreted to be concretions, are hematite-rich and dispersed throughout the outcrop. Hematitic soils both within and outside Eagle crater are dominated by spherules and their fragments. Olivine-bearing basaltic soil is present throughout the region. Bounce rock is probably an impact erratic. Because jarosite is a hydroxide sulfate mineral, its presence at Meridiani Planum is mineralogical evidence for aqueous proc…
The Opportunity Rover's Athena Science Investigation at Meridiani Planum, Mars
2004
The Mars Exploration Rover Opportunity has investigated the landing site in Eagle crater and the nearby plains within Meridiani Planum. The soils consist of fine-grained basaltic sand and a surface lag of hematite-rich spherules, spherule fragments, and other granules. Wind ripples are common. Underlying the thin soil layer, and exposed within small impact craters and troughs, are flat-lying sedimentary rocks. These rocks are finely laminated, are rich in sulfur, and contain abundant sulfate salts. Small-scale cross-lamination in some locations provides evidence for deposition in flowing liquid water. We interpret the rocks to be a mixture of chemical and siliciclastic sediments formed by e…
Exploration of Victoria Crater by the Mars Rover Opportunity
2009
“Lake” Victoria? After having explored the Eagle and Endurance craters, which are separated by only 800 meters, the Mars Exploration Rover Opportunity spent 2 years at Victoria, a much larger impact crater located 6 kilometers south across Meridiani Planum. Sedimentary rocks previously analyzed at Eagle and Endurance point to local environmental conditions that included abundant liquid water in the ancient past. Now, an analysis of rocks in the walls of Victoria by Squyres et al. (p. 1058 ) reveals that the aqueous alteration processes that operated at Eagle and Endurance also acted at Victoria. In addition, sedimentary layering in the crater walls preserves evidence of ancient windblown du…
Soils of Eagle crater and Meridiani Planum at the Opportunity Rover landing site.
2004
The soils at the Opportunity site are fine-grained basaltic sands mixed with dust and sulfate-rich outcrop debris. Hematite is concentrated in spherules eroded from the strata. Ongoing saltation exhumes the spherules and their fragments, concentrating them at the surface. Spherules emerge from soils coated, perhaps from subsurface cementation, by salts. Two types of vesicular clasts may represent basaltic sand sources. Eolian ripples, armored by well-sorted hematite-rich grains, pervade Meridiani Planum. The thickness of the soil on the plain is estimated to be about a meter. The flatness and thin cover suggest that the plain may represent the original sedimentary surface.
Contrail ice particles in aircraft wakes and their climatic importance
2013
[1] Measurements of gaseous (NO, NOy, SO2, HONO) and ice particle concentrations in young contrails in primary and secondary wakes of aircraft of different sizes (B737, A319, A340, A380) are used to investigate ice particle formation behind aircraft. The gas concentrations are largest in the primary wake and decrease with increasing altitude in the secondary wake, as expected for passive trace gases and aircraft-dependent dilution. In contrast, the measured ice particle concentrations were found larger in the secondary wake than in the primary wake. The contrails contain more ice particles than expected for previous black carbon (soot) estimates. The ice concentrations may result from soot-…
Virtuālā mācību platforma Minecraft Education Edition skolēnu programmēšanas prasmju attīstībā datorikas stundās
2021
Maģistra darbā “Virtuālā mācību platforma Minecraft Education Edition skolēnu programmēšanas prasmju attīstībā datorikas stundās” tiek pētīts, vai interaktīvajās spēlēs balstītās mācību platformas lietojums datorikas stundās pēc pētnieču izstrādātās nodarbību metodoloģijas var sekmēt skolēnu programmēšanas prasmju attīstību. Maģistra darba pētījuma dizains ir darbības pētījums. Pētnieces noskaidro, vai mēģinājumu un kļūdu metode, vingrinoties virtuālajā mācību platformā Microsoft Minecraft Education Edition 5. klašu datorikas fakultatīvajās programmēšanas nodarbībās, ir piemērots didaktiskais paņēmiens. Savukārt, ar izziņas spēju testu tiek novērtēts, vai programmēšanas prasmes fakultatīvo …
Virtuālā mācību platforma Minecraft Education Edition skolēnu programmēšanas prasmju attīstībā datorikas stundās
2021
Maģistra darbā “Virtuālā mācību platforma Minecraft Education Edition skolēnu programmēšanas prasmju attīstībā datorikas stundās” tiek pētīts, vai interaktīvajās spēlēs balstītās mācību platformas lietojums datorikas stundās pēc pētnieču izstrādātās nodarbību metodoloģijas var sekmēt skolēnu programmēšanas prasmju attīstību. Maģistra darba pētījuma dizains ir darbības pētījums. Pētnieces noskaidro, vai mēģinājumu un kļūdu metode, vingrinoties virtuālajā mācību platformā Microsoft Minecraft Education Edition 5. klašu datorikas fakultatīvajās programmēšanas nodarbībās, ir piemērots didaktiskais paņēmiens. Savukārt, ar izziņas spēju testu tiek novērtēts, vai programmēšanas prasmes fakultatīvo …
Der Möbeltischler für das bürgerliche Wohnhaus in allen seinen Räumen
1876
Vorlagen zu Möbeln für Wohn-, Speise- und Schlafzimmer, Gesellschafts- und Arbeitszimmer, für Toilette, Garderobe, Vorsaal, Comptoir, Küche, Garten u. s. w. in den modernsten und gangbarsten Formen : mit besonderer Rücksicht auf das bürgerliche Bedürfniß, wie auf leichte und billige Herstellung. Sechsunddreißig Folio-Tafeln.
La poltrona di Proust. Evoluzione ed epistemologia di una relazione di prossimità tra design e artigianato.
2022
The proximity between craft and design has been identified as one of the many reasons for the success of what has been the Made in Italy phenomenon, and now the contemporary design scenario shows a strong tendency to contamination of skills from one discipline to the other. This paper offers a critical analysis of the evolution of this relationship to identify new cognitive tools to interpret and categorise the instances of hybrid design in the era of design when everybody designs.