42 research outputs found
A theory of quantitative inference for artifact sets, applied to a mechanical design compiler
No full textThesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1989.Includes bibliographical references (leaves 133-138).by Allen Corlies Ward.Sc.D
Cassini Synthetic Aperture RADAR Derived Digital Topographic Models of Saturn's Moon Titan
No full textThese are ISIS cube files of topographic models for Titan, reported in P. Corlies et al. "Titan's Topography and Shape at the End of the Cassini Mission." In P. Corlies et al. we found: With the conclusion of the Cassini mission, we present an updated topographic map of Titan, including all the available altimetry, SARtopo, and stereophotogrammetry topographic data sets available from the mission. We use radial basis functions to interpolate the sparse data set, which covers only ∼9% of Titan's global area. The most notable updates to the topography include higher coverage of the poles of Titan, improved fits to the global shape, and a finer resolution of the global interpolation. We also present a statistical analysis of the error in the derived products and perform a global minimization on a profile-by-profile basis to account for observed biases in the input data set. We find a greater flattening of Titan than measured, additional topographic rises in Titan's southern hemisphere and better constrain the possible locations of past and present liquids on Titan's surface.This data was collected and processed by the NASA Cassini spacecraft mission
Interstate Commerce Commission, Report of the Accident Investigation Occurring on the CHICAGO, MILWAUKEE AND ST. PAUL RAILWAY, CORLIES, WI.
No full texthttps://doi.org/10.21949/15061481911PDFTech ReportFrontal crashesRailroad crashesRailroad trainsUnited StatesWisconsinUnited States. Interstate Commerce CommissionUnited States. Interstate Commerce CommissionInvestigations of Railroad Accidents 1911 \u2013 1993CHICAGO, MILWAUKEE AND ST. PAUL RAILWAY in CORLIES, WI.90
Titan's topography and shape at the end of the Cassini mission
No full textWith the conclusion of the Cassini mission, we present an updated topographic map of Titan, including all the available altimetry, SARtopo, and stereophotogrammetry topographic data sets available from the mission. We use radial basis functions to interpolate the sparse data set, which covers only ∼9% of Titan's global area. The most notable updates to the topography include higher coverage of the poles of Titan, improved fits to the global shape, and a finer resolution of the global interpolation. We also present a statistical analysis of the error in the derived products and perform a global minimization on a profile-by-profile basis to account for observed biases in the input data set. We find a greater flattening of Titan than measured, additional topographic rises in Titan's southern hemisphere and better constrain the possible locations of past and present liquids on Titan's surface
Updates on the Titan Cloud Monitoring Campaign: Large Storms and Future Forecasts
No full textInternational audienceWe present the results of an ongoing cloud monitoring campaign that uses ground-based telescopes to search for clouds on Titan. This campaign, begun in 2013, upholds the legacy of the Cassini mission by continuing to monitor Titan's atmospheric activity - providing insight into the seasonal distribution of Titan's clouds including their location, frequency, and duration. To provide context for this campaign, we will first summarize the results of previous ground-based campaigns and Cassini observations, providing a more complete picture of the seasonality of the observations and highlighting the differences in cloud frequency and characteristics that have been observed over the course of a Titan season. To date, this campaign has observed several, sometimes unexpected, phenomena of Titan's meteorology. First, is an extended period of minimal cloud activity (as also observed with Cassini [Turtle et al. 2018]) in the season after equinox, during which time clouds were expected to form at northern mid-latitudes, but were not observed. Following this period of lower-than-predicted activity, clouds were regularly observed at northern latitudes with Cassini (Turtle et al. 2018), with the first mid-latitude storms observable from the ground in May 2017 (Corlies et al. 2018). Since this time, regular cloud activity has been observed throughout this campaign, with storms ranging in latitudes from the equator to the northern pole. We will present a summary of these observations, highlighting two large multi-week storms, which were rarely seen during southern summer, and possibly suggests an intimate connection between the liquid reservoirs at Titan's North Pole and large-scale cloud activity. We will end with a discussion of how these observations compare to those made with both Cassini and past ground based campaigns, how they might help inform models of Titan's atmosphere (Lora et al. 2015, Newman et al. 2016), and discuss the upcoming steps to continue monitoring Titan's complex hydrologic cycle both from the ground (ELT, TMT, GMT) and space/in-situ (JWST/Dragonfly)
Annals of the Sinnott, Rogers, Coffin, Corlies, Reeves, Bodine and allied families,
No full textp. cm
The UV multi-object slit-spectrograph FIREBall-2 simulator
No full textInternational audienceno abstrac
Quantifying Morphological Changes and Sediment Transport Pathways on Comet 67P/Churyumov‐Gerasimenko
No full textComets are active geological worlds with primitive surfaces that have been shaped to varying degrees by sublimation-driven sediment transport and mass wasting processes. Rosetta's rendezvous with comet 67P/Churyumov-Gerasimenko (67P) in 2014 provided data with the necessary spatial and temporal resolutions to observe many evolutionary processes on micro-gravity worlds. Rosetta's observations have thus far revealed that many changes to the surface occurred within 67P's smooth terrains, vast sedimentary deposits that blanket a significant fraction of the nucleus. Understanding the global context of these changes, and therefore the sediment transport pathways that govern the evolution of 67P's surface, requires a thorough description of their changing morphologies and an evaluation of existing global-scale spatial and temporal trends. Accordingly, we present a time-resolved synthesis of erosion and deposition activity on comet 67P as it passed through its 13 August 2015 perihelion from September 2014 to August 2016. Our mapping results indicate that, around perihelion, sediment is globally redistributed inter-regionally from 67P's more active south to the north. Equally important, however, are local, topographically influenced sediment transport processes, with large volumes of sediment moving intra-regionally over sub-kilometer distances. We also show evidence for regions of near-zero net erosion/deposition between approximately 30°N-60°N latitude, which may act as terminal sedimentary sinks, with the remobilization of these materials hindered by multiple factors. Our work therefore provides the most complete mapping of sediment transport processes and pathways across 67P, a critical step toward understanding the global landscape evolution of both 67P and other comets
Geomorphologic Evolution of the Imhotep Region of Comet 67P Churyumov-Gerasimenko
No full textWe investigated the temporal and spatial evolution of the smooth terrain Imhotep on Comet 67P/ Churyumov-Gerasimenko with the goal of characterizing and quantifying the scales of the geomorphologic processes acting on the comet's surface
