Ehsan Vaghefi, Song Yang, Li Xie, Danjie Han, Aaron Yap, Ole Schmeidel, John Marshall, David Squirrell,
To validate the potential application of THEIA™ as clinical decision making assistant in a national screening program.A total of 900 patients were recruited from either an urban large ... Healthy/mild/more than mild/sight threatening categories.THEIA™ managed to grade all images obtained during the ... detecting "sight threatening" disease, at the patient level THEIA™ achieved 100% imageability, 100% [98.49-100.00%] ... negative predictive value of 100%. In other words, THEIA™ did not miss any patients with "more than ...
Tópico(s): Glaucoma and retinal disorders
2022 - Springer Nature | Eye
M. M. M. Meier, A. Reufer, R. Wieler,
Knowing the isotopic composition of Theia, the proto-planet which collided with the Earth in the Giant Impact that formed the Moon, could provide interesting insights on ... calculate the possible ranges of isotopic composition of Theia in O, Si, Ti, Cr, Zr and W ... 1052) allow – by a narrow margin – for a Theia similar to CI-chondrites, and Mars. The "hit- ... 2012]. Icarus 221, 296–299) allows for a Theia similar to enstatite-chondrites and other Earth-like ... the bulk mantles of the proto-Earth and Theia, the high angular momentum models cannot explain the ...
Tópico(s): Geology and Paleoclimatology Research
2014 - Elsevier BV | Icarus
Waheed Akram, Maria Schönbächler,
... the Moon acquired a significant amount of impactor (Theia) material, which is challenging to reconcile with geochemical ... modelling of the isotopic composition of the impactor Theia. All analysed lunar samples (whole-rock, ilmenite and ... to infer the most extreme isotopic composition that Theia could have possessed, relative to the Earth, for ... a CI- and enstatite chondrite-like composition for Theia. Thus, the impactor Theia most likely had a Zr isotope composition close ... solar system (or accretion region of the Earth, Theia and enstatite chondrites) had a uniform Zr isotope ...
Tópico(s): Geology and Paleoclimatology Research
2016 - Elsevier BV | Earth and Planetary Science Letters
Jeff J. Andrews, Jason L. Curtis, Julio Chanamé, Marcel A. Agüeros, Simon C. Schuler, Marina Kounkel, Kevin R. Covey,
... several hundred parsecs. We analyze one such structure, Theia 456, a low-density stellar stream extending nearly ... the Transiting Exoplanet Survey Satellite (TESS), we establish Theia 456's radial velocity coherence, and we find strong evidence that members of Theia 456 have a common age ($\simeq$175 Myr), ... the Milky Way, which are in its halo, Theia 456 is firmly part of the thin disk. If our conclusions about Theia 456 can be applied to even a small ... the remaining $\simeq$8300 independent structures in the Theia catalog, such low-density stellar streams may be ...
Tópico(s): Astro and Planetary Science
2022 - Institute of Physics | The Astronomical Journal
Nathan A. Kaib, Nicolas B. Cowan,
... simulations to conclude that the moon-forming impactor (Theia) had only a ∼5% or less chance of ... Nature 520, 212–215) systematically yields more massive Theia analogs and imposes flatter Δ17O gradients across the ... these effects diminish isotopic differences between Earth and Theia analogs. While it is notoriously difficult to produce ... that the greater isotopic differences between Earth and Theia found in Kaib and Cowan (Kaib, N.A., ... contribution to Moon formation enhance the fraction of Theia analogs consistent with the canonical giant impact hypothesis, ...
Tópico(s): Astrophysics and Star Formation Studies
2015 - Elsevier BV | Icarus
F. Malbet, Alain Léger, G. Anglada‐Escudé, A. Sozzetti, Douglas Spolyar, Lucas Labadie, Mike Shao, B. Holl, Renaud Goullioud, Antoine Crouzier, Céline Bœhm, A. Krone-Martins,
Theia is a logical successor to Gaia, as a focused, very high precision astrometry mission which addresses ... dark matter and the search for habitable planets. Theia addresses a number of other science cases strongly ... clusters, follow-up of Gaia objects of interest. Theia s "point and stare" operational mode will enable ... level can only be reached from space. The Theia spacecraft, which will carry a 0.8-m ... at L2 for 3,5 years. The preliminary Theia mission assessment allowed us to identify a safe ...
Tópico(s): Astro and Planetary Science
2016 - SPIE | Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE
... from the core of the moon-forming impactor, Theia. The Moon then likely contains iron from Theia's core. Mass balances lend plausibility. The lunar ... 5 × 1021 kg or a few percent of Theia's core. This mass is comparable to the ... component. Chemically in this hypothesis, Fe metal from Theia's core entered the Moon-forming disk. H2O ... Fe2O3, which quantitatively oxidized the admixed Fe from Theia's core, retaining Pt-group elements. In this ...
Tópico(s): Geological and Geochemical Analysis
2016 - Wiley | Geochemistry Geophysics Geosystems
Simon Gascoin, Manuel Grizonnet, Marine Bouchet, Germain Salgues, Olivier Hagolle,
Abstract. The Theia Snow collection routinely provides high-resolution maps of the snow-covered area from Sentinel-2 and Landsat-8 ... High Atlas in Morocco. Each product of the Theia Snow collection contains four classes: snow, no snow, ... that the snow is accurately detected in the Theia snow collection and that the snow detection is ... acquisition as raster and vector files via the Theia portal (https://doi.org/10.24400/329360/F7Q52MNK).
Tópico(s): Climate change and permafrost
2019 - Copernicus Publications | Earth system science data
N. Jeremy Kasdin, Eric Cady, Philip Dumont, P. Douglas Lisman, Stuart Shaklan, Rémi Soummer, David N. Spergel, Robert J. Vanderbei,
... describe the design of an occulter for the THEIA mission concept. THEIA consists of a 4-meter telescope diffraction limited ... system employing both an occulter and internal coronagraph, THEIA now uses a single occulter to achieve all ... We describe the basic design principles of the THEIA occulter, its final configuration, performance, and sensitivity.
Tópico(s): Astronomy and Astrophysical Research
2009 - SPIE | Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE
Daniel Herwartz, Andreas Pack, Bjarne Friedrichs, A. Bischoff,
... of the proto-Earth with a planetesimal named Theia. Most numerical models of this collision imply a higher portion of Theia in the Moon than in Earth. Because of ... all attempts to identify the isotopic component of Theia in lunar rocks have failed. Our triple oxygen ... speculate on an enstatite chondrite-like composition of Theia. The observed small compositional difference could alternatively be ...
Tópico(s): Geology and Paleoclimatology Research
2014 - American Association for the Advancement of Science | Science
Ehsan Vaghefi, Song Yang, Li Xie, Sarah Hill, Ole Schmiedel, Robert L. Murphy, David Squirrell,
... Zealand national diabetic retinopathy screening programme. Methods The THEIA™ artificial intelligence system for retinopathy and maculopathy screening, ... threatening, respectively. Using the referable/non‐referable categories, THEIA achieved overall sensitivity of 94% (95% CI 92– ... for the Counties Manukau District Health Board. Implementing THEIA into a New Zealand national diabetic screening programme could significantly reduce the manual grading load. Conclusion THEIA, an artificial intelligence tool to assist in clinical ...
Tópico(s): Retinal and Optic Conditions
2020 - Wiley | Diabetic Medicine
Jonathan Gagné, Jacqueline K. Faherty, Leslie Moranta, Mark Popinchalk,
... Carina and Columba associations may be linked to Theia 208 from Kounkel & Covey and together form parts ... open cluster. The AB Doradus moving group and Theia 301 may form a trailing tidal tail behind ... hints of a possible leading tidal tail in Theia 369. Similarly, we find that IC 2391 and ... Argus association and are possibly further extended by Theia 115. The nearby Octans and Octans-Near associations, as well as Theia 94 and 95, may form a large tidal ...
Tópico(s): Astrophysics and Star Formation Studies
2021 - IOP Publishing | The Astrophysical Journal Letters
Erik Asphaug, Alexandre Emsenhuber, Saverio Cambioni, T. S. J. Gabriel, S. R. Schwartz,
... model of Moon formation, a Mars-sized protoplanet "Theia" collides with proto-Earth at close to their ... graze-and-merge" collision strands a fraction of Theia's mantle into orbit, while Earth accretes most of Theia and its momentum. Simulations show that this produces ... dynamics. However, a Moon that derives mostly from Theia's mantle, as angular momentum dictates, is challenged ... begins with a somewhat faster collision, when proto-Theia impacts proto-Earth at ~1.2 $v_{\rm ...
Tópico(s): Geology and Paleoclimatology Research
2021 - Institute of Physics | The Planetary Science Journal
N. Jeremy Kasdin, Tomonori Usuda, Motohide Tamura, Miki Ishii,
... an overview of the scientific potential of the THEIA mission concept. THEIA consists of a 4‐meter telescope diffraction limited ... key science areas and how the capabilities of THEIA can provide novel and interesting results in these ...
Tópico(s): Adaptive optics and wavefront sensing
2009 - American Institute of Physics | AIP conference proceedings
Nathan A. Kaib, Nicolas B. Cowan,
... of material from Earth's last major impactor (Theia), yet its isotopic composition is indistinguishable from Earth. ... particular, we find that the feeding zones of Theia analogs are significantly more stochastic than the planetary ... 5% or less probability that the Earth and Theia will form with an isotopic difference equal to ... signature. In addition, we find paucities of massive Theia analogs and high velocity Moon-forming collisions, two ...
Tópico(s): Stellar, planetary, and galactic studies
2015 - Elsevier BV | Icarus
Steven J. Desch, K. L. Robinson,
... have formed after a planetary embryo, known as Theia, collided with the proto-Earth 4.5 billion ... lunar samples to help constrain the composition of Theia. We show that the Moon incorporated very low- ... was largely devoid of chondritic water. We infer Theia was a very large body comparable in size ...
Tópico(s): Planetary Science and Exploration
2019 - Elsevier BV | Geochemistry
S. Zsoldos, Z. Bagdasarian, G. D. Orebi Gann, Andrew Barna, Stephen T. Dye,
Abstract We present the sensitivity of the Theia experiment to low-energy geo- and reactor antineutrinos. For this study, we consider one of the possible proposed designs, a 17.8-ktonne fiducial volume Theia -25 detector filled with water-based liquid scintillator ... at Sanford Underground Research Facility (SURF). We demonstrate Theia ’s sensitivity to measure the geo- and reactor ...
Tópico(s): Dark Matter and Cosmic Phenomena
2022 - Springer Science+Business Media | The European Physical Journal C
Isabelle Braud, Véronique Chaffard, Charly Coussot, Sylvie Galle, Patrick Juen, Hugues Alexandre, Philippe Baillion, Annick Battais, Brice Boudevillain, Flora Branger, Guillaume Brissebrat, Rémi Cailletaud, Gérard Cochonneau, Rémy Decoupes, Jean‐Christophe Desconnets, A. Dubreuil, Juliette Fabre, Santiago Gabillard, Marie‐Françoise Gerard, Sylvain Grellet, Agnès Herrmann, Olivier Laarman, É. Lajeunesse, Geneviève Le Hénaff, Olivier Lobry, Antony Mauclerc, Jean-Baptiste Paroissien, Marie-Claire Pierret, Norbert Silvera, Hervé Squividant,
... management and distribution systems. A common information system (Theia/OZCAR IS) was built to make their in ... create information fluxes between observatories' ISs and the Theia/OZCAR IS. Controlled vocabularies were defined to develop ...
Tópico(s): Research Data Management Practices
2020 - Taylor & Francis | Hydrological Sciences Journal
D. A. Senske, G. G. Schaber, E. R. Stofan,
... with three arms of Devana Chasma intersecting at Theia Mons. Magellan data reveal (1) the details of rifting and volcanism concentrated at Theia Mons, (2) that Rhea Mons is highly deformed ... a major unit, arrayed in a pattern around Theia from east to west starting on the eastern ...
Tópico(s): Geology and Paleoclimatology Research
1992 - American Geophysical Union | Journal of Geophysical Research Atmospheres
Billy Quarles, Jack J. Lissauer,
... which choices of semimajor axes and eccentricities for Theia (the proto-Moon) at this epoch can produce ... We find that the likely semimajor axis of Theia, at the epoch when our simulations begin, depends ...
Tópico(s): Geology and Paleoclimatology Research
2014 - Elsevier BV | Icarus
Alex N. Halliday, D. Porcelli,
... of ∼0.07, consistent with a precursor planet (Theia) that was even less volatile element-depleted than ... 0.03). The time-integrated Rb/Sr of Theia is similar to the present Rb/Sr of ... ratios of the proto-Earth, as well as Theia, were ∼20 000, so that early radioactive heat ...
Tópico(s): Stellar, planetary, and galactic studies
2001 - Elsevier BV | Earth and Planetary Science Letters
... creating the Octoraro sea as an arm of Theia. 3. In Theia, east of the two microcontinents, magmatic arcs developed ... subduction zone late in the Cambrian. Convergence within Theia caused the Potomac orogeny, which obduced the arcs ( ...
Tópico(s): Geochemistry and Geochronology of Asian Mineral Deposits
1997 - Yale University | American Journal of Science
Valentina De Romeri, Pablo Martínez-Miravé, M. Tórtola,
... facilities: the Deep Underground Neutrino Experiment (DUNE) and THEIA. We simulate the expected event spectra at both ... shows that future neutrino experiments like DUNE and THEIA will be able to set competitive constraints on ...
Tópico(s): Particle physics theoretical and experimental studies
2021 - Institute of Physics | Journal of Cosmology and Astroparticle Physics
J. García-Bellido, Hitoshi Murayama, Graham White,
... arrays and LISA. We argue that Gaia and THEIA has great potential for early universe cosmology, since ... Finally, we discuss the potential for Gaia and THEIA to probe topological defects and the ability of ...
Tópico(s): Black Holes and Theoretical Physics
2021 - Institute of Physics | Journal of Cosmology and Astroparticle Physics
... which are the main targets proposed for the THEIA astrometric mission, which is the most elaborate mission ... the 55 F-G-K stars in the THEIA sample. Methods. We used realistic simulations of stellar ... zone corresponding to long periods, namely subgiants, the THEIA observational strategy is not well adapted and should ...
Tópico(s): Adaptive optics and wavefront sensing
2022 - EDP Sciences | Astronomy and Astrophysics
Jop van Hattum, Aaron Bond, D. Jabłoński, Ryan Taylor-Walshe,
Theia Energy Pty Ltd1 (Theia Energy) discovered a potential unconventional hydrocarbon resource in the Ordovician Lower Goldwyer (GIII) Formation shale located on the Broome Platform ... regional data culminated in a successful exploration well, Theia-1 (drilled in 2015), which, based upon petrophysical ... gross oil column at 1500–1570 m depth. Theia-1 recovered essential core and wireline log data ... and appraise commercial viability. This paper will discuss Theia Energy’s exploration campaign in the onshore Canning ...
Tópico(s): Geological and Geophysical Studies
2019 - CSIRO Publishing | The APPEA Journal
E. R. Stofan, J. W. Head, D. B. Campbell, S. H. Zisk, A. F. Bogomolov, O. N. Rzhiga, A. T. Basilevsky, N. A. Armand,
... Later volcanism produced a second major shield volcano, Theia Mons, which is superimposed on the western bounding ... bifurcation of Devana Chasma in the vicinity of Theia Mons, and the extension of the rift system ...
Tópico(s): Astro and Planetary Science
1989 - Geological Society of America | Geological Society of America Bulletin
Uwe Wiechert, Alex N. Halliday, Der‐Chuen Lee, G. A. Snyder, L. A. Taylor, D. Rumble,
... proto-Earth and the smaller impactor planet (named Theia) formed from an identical mix of components. The similarity between the proto-Earth and Theia is consistent with formation at about the same ...
Tópico(s): Isotope Analysis in Ecology
2001 - American Association for the Advancement of Science | Science