Seeing the future work: new guiding principles for librarians and libraries

pp. 53-6

Women’s Power and Community Resilience Rotating Savings and Credit Associations in Barbados and the Bahamas

Resumen

Evaluation of HZETRN on the Martian Surface: Sensitivity Tests and Model Results

The Mars Science Laboratory Radiation Assessment Detector (MSLRAD) is providing continuous measurements of dose, dose equivalent, and particle flux on the surface of Mars. These measurements have been highly useful in validating environmental and radiation transport models that will be heavily relied upon for future deep space missions. In this work, the HZETRN code is utilized to estimate radiation quantities of interest on the Martian surface. A description of the modeling approach used with HZETRN is given along with the various input models and parameters used to define the galactic cosmic ray (GCR) environment and Martian geometry. Sensitivity tests are performed to gauge the impact of varying several input factors on quantities being compared to MSLRAD data. Results from these tests provide context for inter-code comparisons presented in a companion paper within this issue. It is found that details of the regolith and atmospheric composition have a minimal impact on surface flux, dose, and dose equivalent. Details of the density variation within the atmosphere and uncertainties associated with specifying the vertical atmospheric thickness are also found to have minimal impact. Two widely used GCR models are used as input into HZETRN and it is found that the associated surface quantities are within several percent of each other

Cultural Basis of Sport Anglersˈ Response to Reduced Lake Trout Catch Limits

The cultural domain of southeastern Wisconsin anglers along Lake Michigan was assessed from responses to a state‐proposed reduction in the daily allowable catch of lake trout Salvelinus namaycush. The studyˈs baseline was an extensive random survey in 1980 of the areaˈs anglers with respect to Lake Michigan fishery resources. The 1984 lake trout issue was addressed by a restudy involving a small dimensional subsample of 1980 respondents and was cross‐validated with ethnographic interviews. The findings suggest that anglers have responded over time to the stateˈs policy proposals in a manner consistent with a stable value system that is not seriously masked by changes in short‐term attitudes about the fishery. The results further indicate that, once a good cultural data base is established, the sociocultural impacts of proposed fishery policies can be evaluated inexpensively by a restudy approach.Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/141485/1/tafs0503.pd

Simulation and Measurement of Absorbed Dose from 137 Cs Gammas Using a Si Timepix Detector

The TimePix readout chip is a hybrid pixel detector with over 65k independent pixel elements. Each pixel contains its own circuitry for charge collection, counting logic, and readout. When coupled with a Silicon detector layer, the Timepix chip is capable of measuring the charge, and thus energy, deposited in the Silicon. Measurements using a NIST traceable 137Cs gamma source have been made at Johnson Space Center using such a Si Timepix detector, and this data is compared to simulations of energy deposition in the Si layer carried out using FLUKA

Alliance for Information: Michigan Librarians and Library Faculty Join Forces for the Future

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/93795/1/DB511012.pd

Light ion isotope identification in space using a pixel detector based single layer telescope

Citation: Kroupa, M., Bahadori, A. A., Campbell-Ricketts, T., George, S. P., Stoffle, N., & Zeitlin, C. (2018). Light ion isotope identification in space using a pixel detector based single layer telescope. Applied Physics Letters, 113(17), 174101. https://doi.org/10.1063/1.5052907It is demonstrated that modern pixel detectors can be utilized as single-layer particle telescopes, offering details of a particle's stopping power evolution surpassing those provided by multi-layer, non-pixelated instruments. For particles that stop in the detector, this advantage arises from repeatably sampling the Bragg curve: we always know which part of the Bragg peak was measured. We can then create a dE/dx1 vs dE/dx2 plot where the stopping power at the beginning and the end of the track is compared. We are able to identify and analyze several fine-grained features on such plots, including several related to particles that stop inside the detector, termed “stopping.” Using data from an instrument aboard the International Space Station, we show that different isotopes of stopping hydrogen can be identified as their stopping powers differ. Other features of the dE/dx1 vs dE/dx2 plot not resolvable in multi-layer particle telescopes are also exhibited, such as nuclear interactions that occur within the sensor active volume

Space Weather Status for Exploration Radiation Protection

Management of crew exposure to radiation is a major concern for manned spaceflight and will be even more important for the modern concept of longer-duration exploration. The inherent protection afforded to astronauts by the magnetic field of the Earth in Low Earth Orbit (LEO) makes operations on the space shuttle or space station very different from operations during an exploration mission. In order to experience significant radiation-derived Loss of Mission (LOM) or Loss of Crew (LOC) risk for LEO operations, one is almost driven to dictate extreme duration or to dictate an extreme sequence of solar activity. Outside of the geo-magnetosphere, however, this scenario changes dramatically. Exposures to the same event on the ISS and in free space, for example, may differ by orders of magnitude. This change in magnitude, coupled with the logistical constraints present in implementing any practical operational mitigation make situational awareness with regard to space weather a limiting factor for the ability to conduct exploration operations. We present a current status of developing operational concepts for manned exploration and expectations for asset viability and available predictive and characterization toolsets