87 research outputs found
Exploratory Measurements of the (3-He,n) Reaction at Medium Energies
This work was supported by the National Science Foundation Grant NSF PHY 81-14339 and by Indiana Universit
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Preliminary screening of thermal storage concepts for water/steam and organic fluid solar thermal receiver systems
A preliminary comparison of thermal storage concepts for solar thermal applications was done generically for large and small solar systems with sensible and latent heat and two-stage storage concepts. Concepts were ranked based on the cost of delivered energy. A +- 20% uncertainty in subsystem cost was included in the analysis. Water/steam and organic fluid collector/receivers were studied separately. For the water/steam concept, Barstow technology (100 MW/sub e/) was examined. A nitrite/nitrate salt with a low-cost solid medium was best for buffer storage; for diurnal storage, the two-stage draw salt/low-cost media and oil/rock concept was best. Phase change concepts require improvements on the concept analyzed to be attractive. For the organic fluid system, a Shenandoah total energy system was examined. The Syltherm trickle charge taconite concept was the most favorable and may be improved by replacing the taconite with a lower-cost oil-compatible medium. Salt concepts can be competitive with this system only if there is a low-cost solid medium that is compatible with the salt and the end use requires a large amount of storage. The phase change concept examined was found to be quite poor for this total energy application
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No Evidence for More Earth-sized Planets in the Habitable Zone of Kepler's M versus FGK Stars
Reliable detections of Earth-sized planets in the habitable zone remain elusive in the Kepler sample, even for M dwarfs. The Kepler sample was once thought to contain a considerable number of M-dwarf stars (T eff < 4000 K), which hosted enough Earth-sized ([0.5, 1.5] R ⊕) planets to estimate their occurrence rate (η ⊕) in the habitable zone. However, updated stellar properties from Gaia have shifted many Kepler stars to earlier spectral type classifications, with most stars (and their planets) now measured to be larger and hotter than previously believed. Today, only one partially reliable Earth-sized candidate remains in the optimistic habitable zone, and zero in the conservative zone. Here we performed a new investigation of Kepler's Earth-sized planets orbiting M-dwarf stars, using occurrence rate models with considerations of updated parameters and candidate reliability. Extrapolating our models to low instellations, we found an occurrence rate of η ⊕ = 8.58 − 8.22 + 17.94 % for the conservative habitable zone (and 14.22 − 12.71 + 24.96 % for the optimistic one), consistent with previous works when considering the large uncertainties. Comparing these estimates to those from similarly comprehensive studies of Sun-like stars, we found that the current Kepler sample does not offer evidence to support an increase in η ⊕ from FGK to M stars. While the Kepler sample is too sparse to resolve an occurrence trend between early and mid- to late M dwarfs for Earth-sized planets, studies including larger planets and/or data from the K2 and TESS missions are well suited to this task. © 2023. The Author(s). Published by the American Astronomical Society.Open access journalThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at [email protected]
PND16 CHARACTERIZING DIRECT COSTS ASSOCIATED WITH HEMOPHILIA A: A RESOURCE-BASED COST ANALYSIS
PSY51 Cost to society due to underemployment in persons with hemophilia A and B – hemophilia utilization group study v (HUGS V)
Cost to society due to underemployment in persons with hemophilia A and B – hemophilia utilization group study v (HUGS V)
PND33 UTILIZING A PAPER STANDARD GAMBLE INSTRUMENT TO ASSESS HEALTH UTILITY IN PATIENTS WITH HEMOPHILIA B
Longitudinal changes in health-related quality of life for chronic diseases: An example from the hemophilia utilization group study part va (HUGS Va)
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