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ItemTemperature, Salinity and Velocity Data Derived from the Overturning in the Subpolar North Atlantic Program (OSNAP) Array between August 2014 and May 2018(Georgia Institute of Technology, 2023-03-30) Li, Feili ; Lozier, M. Susan ; Bacon, S. ; Bower, Amy S. ; Cunningham, Stuart A. ; de Jong, M. Femke ; deYoung, Brad ; Fraser, Neil ; Fried, Nora ; Han, Guoqi ; Holliday, N. Penny ; Holte, James ; Houpert, L. ; Inall, Mark E. ; Johns, William E. ; Jones, Sam ; Johnson, C. ; Karstensen, Johannes ; LeBras, I.A. ; Lherminier, P. ; Lin, X. ; Mercier, H. ; Oltmanns, M. ; Pacini, Astrid ; Petit, T. ; Pickart, Robert S. ; Rayner, Darren ; Straneo, Fiammetta ; Thierry, V. ; Visbeck, M. ; Yashayaev, Igor ; Zhou, C.OSNAP (Overturning in the Subpolar North Atlantic Program) is an international program designed to provide a continuous record of the full-water column, trans-basin fluxes of heat, mass and freshwater in the subpolar North Atlantic.
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ItemMeridional Overturning Circulation Observed by the Overturning in the Subpolar North Atlantic Program (OSNAP) Array from August 2014 to June 2020(Georgia Institute of Technology, 2023) Fu, Yao ; Lozier, M. Susan ; Biló, Tiago Carrilho ; Bower, Amy S. ; Cunningham, Stuart A. ; Cyr, Frédéric ; de Jong, M. Femke ; deYoung, Brad ; Drysdale, Lewis ; Fraser, Neil ; Fried, Nora ; Furey, Heather H. ; Han, Guoqi ; Handmann, Patricia ; Holliday, N. Penny ; Holte, James ; Inall, Mark E. ; Johns, William E. ; Jones, Sam ; Karstensen, Johannes ; Li, Feili ; Pacini, Astrid ; Pickart, Robert S. ; Rayner, Darren ; Straneo, Fiammetta ; Yashayaev, IgorAn international effort, Overturning in the Subpolar North Atlantic Program (OSNAP), is a partnership among oceanographers from the US, UK, Germany, the Netherlands, Canada and China whose goal is to measure and understand what drives the Atlantic Meridional Overturning Circulation (MOC) and its variability. OSNAP is consisted of about 60 moorings that stretch from Labrador to Greenland to Scotland, providing a continuous record of the full water column, trans-basin volume transports in the subpolar North Atlantic. The first 6 years of data (August 2014 - June 2020) from the full OSNAP array has been used to produce the monthly estimates of the MOC at OSNAP. All data are freely available from www.o-snap.org.
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ItemRaw mechanical testing data for article "Structural damping renders the hawkmoth exoskeleton mechanically insensitive to non-sinusoidal deformations"(Georgia Institute of Technology, 2023) Wold, Ethan S. ; Lynch, James ; Gravish, Nick ; Sponberg, Simon
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ItemCaCO3 Polymorphs as Mineral Catalysts for Prebiotic Phosphorylation of Uridine(Georgia Institute of Technology, 2022-12) Schaible, Micah J. ; Castañeda, Alma D. ; Menor-Salvan, Cesar ; Pasek, Matthew A. ; Burcar, Bradley T. ; Orlando, Thomas M.Establishing plausible routes for the abiotic formation of nucleotides is a challenging problem because the phosphorylation of organic molecules is thermodynamically unfavorable in water, and because common phosphorous-containing minerals such as apatite are highly insoluble. Reactions of reduced phases such as the meteoritic mineral schreibersite with ammonia containing solutions can form stable amino-derivatives of phosphates/phosphite, and carbonate-rich lakes have been suggested as environments where phosphate species and organic molecules could accumulate in significant abundances, thus promoting an ideal environment for abiotic phosphorylation. This work reports the catalytic properties of three CaCO3 polymorphs – calcite, aragonite, and vaterite – on diamidophosphate (DAP)-induced phosphorylation of the uridine nucleoside during a 24-hour dry-down reaction. It is shown that the phosphorylation reaction is accelerated in solutions containing CaCO3 compared to those with no mineral present. For un-buffered solutions with no mineral present, the primary products formed are uridine monophosphates (UMP), with yields making up 22.3 ± 3.9% of the total detected species, while solutions containing calcite and aragonite formed primarily UMP dimers (yields of 15.3 ± 1.1% and 14.8 ± 1.3%, respectively). Vaterite showed a strong preference for forming cyclic UMP (cUMP) (26.3 ± 0.3% yield), and no higher order polymers were observed using any carbonate mineral. Reactions containing CaSO4∙2H2O (gypsum) showed a preference for forming cUMP, though not as strong as vaterite, while those containing CaCl2 (calcium chloride) and CaWO4 (scheelite) did not yield any phosphorylated products other than UMPs. These results suggest that CaCO3 minerals could have played an important role in facilitating prebiotic phosphorylation in aqueous environments that undergo drying cycles.
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ItemOverturning in the Subpolar North Atlantic Program (OSNAP) Model Truth Code(Georgia Institute of Technology, 2022-07) Fortin, Anne-Sophie ; Majumder, Sudip ; Li, Feili ; Fu, YaoAs part of an international effort, the Overturning in the Subpolar North Atlantic Program (OSNAP), is an ocean observing system that continuously measures trans-basin velocity, temperature and salinity of the full water column in the subpolar North Atlantic since 2014. As there is a broad interest in the community to compare model simulations with observational estimates, we propose a simple Python code that computes the meridional overturning circulation (MOC) from a model dataset interpolated onto the OSNAP section. Please note that this code is the beta version. We appreciate any feedback that could be useful for ulterior versions. In addition, there are ongoing efforts to make this code generalized for any model dataset in future versions.
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ItemTemperature Programmed Desorption Comparison of Lunar Regolith to Lunar Regolith Simulants LMS-1 and LHS-1 - Data Files(Georgia Institute of Technology, 2022) Clendenen, Ashley Rebekah ; Aleksandrov, Aleksandr ; Jones, Brant M. ; Loutzenhiser, Peter G. ; Britt, Daniel T. ; Orlando, Thomas M.Water and molecular hydrogen evolution from Apollo sample 14163 and lunar regolith simulants LMS-1 and LHS-1 were examined using Temperature Programmed Desorption (TPD) in ultra-high vacuum. LMS-1, LHS-1, and Apollo 14163 released water upon heating, whereas only the Apollo sample directly released measurable quantities of molecular hydrogen. The resulting H2O and H2 TPD curves were fit using a model which considers desorption at the vacuum grain interface, transport in the void space between grain-grain boundaries, molecule formation via recombination reactions and sub-surface diffusion. The model yielded a most probable H2O formation and desorption effective activation energy of ~150 kJ mol-1 for all samples. The probability distribution widths were ~100 - 400, ~100 - 350, and ~100 - 300 kJ mol-1 for LMS-1, LHS-1, and Apollo 14163, respectively. In addition to having the narrowest energy distribution width, the Apollo sample released the least amount to water (103 ppm) relative to LMS-1 (176 ppm) and LHS-1 (195 ppm). Since essentially no molecular hydrogen was observed from the simulants, the results indicate that LMS-1 and LHS-1 display water surface binding and transport interactions similar to actual regolith but not the desorption chemistry associated with the implanted hydrogen from the solar wind. Overall, these terrestrial surrogates are useful for understanding the surface and interface interactions of lunar regolith grains, which are largely dominated by the terminal hydroxyl sites under both solar wind bombardment and terrestrial preparation conditions.
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ItemConductivity-Temperature-Depth (CTD) data as part of the Overturning in the Subpolar North Atlantic Program (OSNAP), from 2020 on the R/V Neil Armstrong(Georgia Institute of Technology, 2022) Pickart, Robert S. ; McRaven, LeahThe Overturning of the Subpolar North Atlantic Program (OSNAP) is an effort to determine the strength of the meridional overturning circulation and associated heat and freshwater fluxes in the subpolar North Atlantic. It is a collaborative program with scientists from the U.S., U.K., Netherlands, Germany, France, Canada, and China. Together, a series of hydrographic surveys and mooring deployments have been completed across the boundaries of the Labrador Sea, Irminger Sea, Iceland Basin, and eastern subpolar North Atlantic.
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ItemData for 'Locomotion without force, and impulse via dissipation: Robotic swimming in curved space via geometric phase'(Georgia Institute of Technology, 2022) Li, Shengkai ; Wang, Tianyu ; Kojouharov, Velin H. ; McInerney, James ; Aydin, Enes ; Aydin, Yasemin O. ; Goldman, Daniel I. ; Rocklin, D. Zeb
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ItemGrasp Posture Variability Leads to Greater Ipsilateral Sensorimotor Beta Activation during Prosthesis Use Data(Georgia Institute of Technology, 2022) Alterman, Bennett L. ; Ali, Saif ; Keeton, Emily ; Binkley, Katrina ; Hendrix, William ; Lee, Perry J. ; Johnson, John T. ; Wang, Shuo ; Kling, James ; Gale, Mary Kate ; Wheaton, Lewis A.
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ItemConductivity-Temperature-Depth (CTD) data as part of the Overturning in the Subpolar North Atlantic Program (OSNAP), from 2018 on the R/V Neil Armstrong(Georgia Institute of Technology, 2022) Pickart, Robert S. ; McRaven, LeahThe Overturning of the Subpolar North Atlantic Program (OSNAP) is an effort to determine the strength of the meridional overturning circulation and associated heat and freshwater fluxes in the subpolar North Atlantic. It is a collaborative program with scientists from the U.S., U.K., Netherlands, Germany, France, Canada, and China. Together, a series of hydrographic surveys and mooring deployments have been completed across the boundaries of the Labrador Sea, Irminger Sea, Iceland Basin, and eastern subpolar North Atlantic.