1,374 research outputs found
Evolution of impact melt pools on Titan - data files
No full textData files to produce figures in the manuscript entitled 'Evolution of impact melt pools on Titan' written by Klara Kalousova, Shigeru Wakita, Christophe Sotin, Catherine D. Neish, Jason M. Soderblom, Ondrej Soucek, and Brandon C. Johnson and submitted to Journal of Geophysical Research: Planets.This work was supported by the Czech Science Foundation through project No. 22-20388S (KK, OS) and through NASA Cassini Data Analysis Program grant 80NSSC20K0382 (SW, CDN, JMS, BCJ). This research was triggered by discussions during the meeting in Bern of the International Space Science Institute (ISSI) International Team `The habitability of Titan's subsurface water ocean'. We gratefully acknowledge the developers of iSALE-2D, including Gareth Collins, Kai W\"{u}nnemann, Dirk Elbeshausen, Tom Davison, Boris Ivanov, and Jay Melosh (https://isale-code.github.io). This research was supported in part through computational resources provided by Information Technology at Purdue, West Lafayette, Indiana
Geology of the Selk crater region on Titan from Cassini VIMS observations
No full textInternational audienceObservations of Titan obtained by the Cassini Visual and Infrared Mapping Spectrometer (VIMS) have revealed Selk crater, a geologically young, bright-rimmed, impact crater located similar to 800 km north-northwest of the Huygens landing site. The crater rim-crest diameter is 90 km; its floor diameter is similar to 60 km. A central pit/peak, 20-30 km in diameter, is seen; the ratio of the size of this feature to the crater diameter is consistent with similarly sized craters on Ganymede and Callisto, all of which are dome craters. The VIMS data, unfortunately, are not of sufficient resolution to detect such a dome. The inner rim of Selk crater is fluted, probably by eolian erosion, while the outer flank and presumed ejecta blanket appear dissected by drainages (particularly to the east), likely the result of fluvial erosion. Terracing is observed on the northern and western walls of Selk crater within a 10-15 km wide terrace zone identified in VIMS data; the terrace zone is bright in SAR data, consistent with it being a rough surface. The terrace zone is slightly wider than those observed on Ganymede and Callisto and may reflect differences in thermal structure and/or composition of the lithosphere. The polygonal appearance of the crater likely results from two preexisting planes of weakness (oriented at azimuths of 21 degrees and 122 degrees east of north). A unit of generally bright terrain that exhibits similar infrared-color variation and contrast to Selk crater extends east-southeast from the crater several hundred kilometers. We informally refer to this terrain as the Selk "bench." Both Selk and the bench are surrounded by the infrared-dark Belet dune field. Hypotheses for the genesis of the optically bright terrain of the bench include: wind shadowing in the lee of Selk crater preventing the encroachment of dunes, impact-induced cryovolcanism, flow of a fluidized-ejecta blanket (similar to the bright crater outflows observed on Venus), and erosion of a streamlined upland formed in the lee of Selk crater by fluid flow. Vestigial circular outlines in this feature just east of Selk's ejecta blanket suggest that this might be a remnant of an ancient, cratered crust. Evidently the southern margin of the feature has sufficient relief to prevent the encroachment of dunes from the Belet dune field. We conclude that this feature either represents a relatively high-viscosity, fluidizedejecta flow (a class intermediate to ejecta blankets and long venusian-style ejecta flows) or a streamlined upland remnant that formed downstream from the crater by erosive fluid flow from the west-northwest
Titan’s “Magic islands”. Transient features in a hydrocarbon sea
No full textThe region of Titan's hydrocarbon sea, Ligeia Mare, where transient bright features were previously discovered, was anomalously bright in the first of two more recent Cassini RADAR observations but not the second. Another transient bright feature in a different region of Ligeia Mare was also discovered in the first of the new observations. Here we present all the high-resolution observations of the regions containing these transient features and the quantitative constraints that we derived from them. We argue that these features are unlikely to be SAR image artifacts or permanent geophysical structures and thus their appearance is the result of ephemeral phenomena on Titan. We find that the transient features are more consistent with floating and/or suspended solids, bubbles, and waves than tides, sea level change, or seafloor change and based on the frequency of these phenomena in terrestrial settings, we consider waves to be the most probable hypothesis. These transient features are the first instance of active processes in Titan's lakes and seas to be confirmed by multiple detections and demonstrate that Titan's seas are not stagnant but rather dynamic environments
A tangled pathology: how AIDS became a "family disease" in Newark, New Jersey, 1970-1997
No full textAs AIDS proliferated in Newark, New Jersey through the 1980s, local AIDS-care advocates conceptualized AIDS in ways that reflected the disease’s impact on Newarkers. In reframing a problem that was predominately cast as a “gay disease” in North America, AIDS activists in Newark sought to highlight the growing prevalence of HIV and AIDS among urban communities of color. These efforts sought to direct national attention and resources towards affected “at risk” Newarkers by self-consciously portraying HIV and AIDS as a disease of the family. The lynchpin in this discourse was the pediatric AIDS patient. Discussions of HIV-positive children, and the “family disease” frame, became normalizing shorthand for addressing the complex biological transmission of the disease. By the late 1980s, advocates for Newark recognized the political utility in characterizing AIDS as a family disease at a time when the federal government was preparing to allocate funds for the areas hardest hit by the epidemic. This unique discourse was particularly useful in not only drawing attention to the problem of AIDS, but also to the societal “ills” associated with the disease’s prevalence among impoverished communities of color in Newark. As the family disease discourse evolved, Newark came to represent the ubiquitous, albeit insidious, urban problems that contributed to and exacerbated the epidemic in similar U.S. cities. Reserved almost exclusively to descriptions of families of color, the family disease discourse must be understood as—an implicit, if not explicit—response to mainstream perceptions of the inner city. Efforts to cope with AIDS in Newark benefited from the family disease script. Yet the legacy of the family disease discourse perhaps further encumbered cultural perceptions of inner city families as well. The family disease discourse thus inextricably linked the AIDS epidemic in impoverished communities color, and inner city families, to the pernicious social pathologies narrative that had over-determined perceptions of Newark since the late1960s.M.A.Includes bibliographical referencesIncludes vitaby Jason M. Chernesk
Interview: Jason Dittmer Interviewed by Steven M. Schnell, Editor, The Geographical Bulletin
No full textJason Dittmer is from Jacksonville, Florida, received his PhD from Florida State University in 2003, and has taught at University College London in the United Kingdom since 2007. He is the author of Popular Culture, Geopolitics, and Identity (Rowman and Littlefield, 2010) and the co-editor of Mapping the End Times: American Evangelical Geopolitics and Apocalyptic Visions (Ashgate, 2010). He is married to the lovely Stephanie and has two cats. They all live in southeast London
Cassini Bistatic Radar Observations of Titan's Seas: Results about Dielectric Properties and Capillary Waves Detection
No full textRetracted article: Students' learning styles and academic performance in Readings in Philippine History: Basis for a proposed course syllabus enhancement
No full textThe article entitled “Students’ learning styles and academic performance in Readings in Philippine History: Basis for a proposed course syllabus enhancement” (Volume 4, Issue 1, December 2022, pp. 45-51) written by Adrian Ote, Margie M. Lepangge, Nobelen Joy M. Marsonia, Sheena Joy C. Pagran, Jennilyn C. Se, and Jason A. Romero has been retracted at the request of the Corresponding Author
Corrigendum to "Large inequalities in climate mitigation scenarios are not supported by theories of distributive justice"
No full textUnidad de excelencia María de Maeztu CEX2019-000940-MThe author affiliations listed in the article as published were incorrect. Jason Hickel's second affiliation should have been listed as ICREA, Barcelona, as indicated here. Furthermore, the acknowledgments should have stated that JH's work is also supported by the María de Maeztu Unit of Excellence ( CEX2019-374 000940-M) grant from the Spanish Ministry of Science and Innovation. The authors would like to apologise for any inconvenience caused
Digital Elevation Model Data from: Measuring Erosional and Depositional Patterns Across Comet 67P's Imhotep Region
No full textRecommended citation for this dataset:
Abhinav Jindal, Samuel Birch, Alexander Hayes, Fiona P. Özyurt, Adam Issah, Megan Barrington, Jason Soderblom, Randolph Kirk, Raphael Marschall, Jean-Baptiste Vincent. (2023) Digital Elevation Model Data from: Measuring Erosional and Depositional Patterns Across Comet 67P's Imhotep Region. [dataset] Cornell University eCommons Repository. https://doi.org/10.7298/qgyq-ym43These files contain the Digital Elevation Model (DEM) data for the results reported in Jindal et al. Measuring Erosional and Depositional Patterns Across Comet 67P's Imhotep Region. In Jindal et al. we found: Comet 67P/Churyumov-Gerasimenko displays a pronounced hemispherical dichotomy in surface morphology where the southern hemisphere exhibits more erosional features than the northern hemisphere due to receiving much greater solar radiation. Consequently, it is generally assumed that particles are ejected from the southern hemisphere through sublimation and a significant fraction eventually descends as airfall, covering the northern terrains. To investigate this south-to-north material transfer during the comet's perihelion passage, we use photoclinometry to measure material redistribution within its most extensive smooth terrain deposit around the Imhotep region. However, our findings do not align with this expected trend. Instead, we show that local-scale processes substantially impact the erosion and accumulation of material, with one area experiencing net erosion while another nearby region, just a few dozen meters away, sees sediment buildup. Our analysis underscores the complex interplay of processes shaping Comet 67P's surface, and likely comets more generally.This research was supported by the Rosetta Data Analysis Program (80NSSC19K1307) and the Heising-Simons Foundation (51 Pegasi b Fellowship to S.P.D.B)
Constraint Therapy With Progressive Incorporation of Bimanual Therapy Significantly Improves Hand Function in Children With Unilateral Brain Injury
No full textAbstract
Date Presented 3/31/2017
This study examined the efficacy of modified constraint-induced movement therapy, with progressive introduction of bimanual therapy to improve hand functions in children with unilateral brain injury participating in an intensive occupational therapy program.
Primary Author and Speaker: Ka Lai Kelly Au
Contributing Authors: Julie L. Knitter, Susan Morrow-McGinty, Jason B. Carmel, Kathleen M. Friel</jats:p
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