6,931 research outputs found
Playing Games with Quantum Mechanics
We present a perspective on quantum games that focuses on the physical
aspects of the quantities that are used to implement a game. If a game is to be
played, it has to be played with objects and actions that have some physical
existence. We call such games playable. By focusing on the notion of
playability for games we can more clearly see the distinction between classical
and quantum games and tackle the thorny issue of what it means to quantize a
game. The approach we take can more properly be thought of as gaming the
quantum rather than quantizing a game and we find that in this perspective we
can think of a complete quantum game, for a given set of preferences, as
representing a single family of quantum games with many different playable
versions. The versions of Quantum Prisoners Dilemma presented in the literature
can therefore be thought of specific instances of the single family of Quantum
Prisoner's Dilemma with respect to a particular measurement. The conditions for
equilibrium are given for playable quantum games both in terms of expected
outcomes and a geometric approach. We discuss how any quantum game can be
simulated with a classical game played with classical coins as far as the
strategy selections and expected outcomes are concerned.Comment: 3 Figure
From Two Months to Twelve: Providing a Full Year of Medicaid Postpartum Coverage, Regardless of Immigration Status
Federal law requires that those who give birth while enrolled in Medicaid are provided just 60 days of postpartum coverage. Yet, the period beyond two months postpartum is also a critical time to prevent detrimental health outcomes or even death. The American Rescue Plan Act of 2021 (ARPA) created a new Medicaid and CHIP state plan amendment option to provide one year of continuous Medicaid postpartum coverage as a way to improve both coverage rates among those who have recently given birth and maternal and child health outcomes. Michigan successfully extended this year-long Medicaid postpartum coverage in April 2022, which will benefit an estimated 16,000 pregnant and postpartum people in the state
The relationship of (perceived) epistemic cognition to interaction with resources on the internet
Information seeking and processing are key literacy practices. However, they are activities that students, across a range of ages, struggle with. These information seeking processes can be viewed through the lens of epistemic cognition: beliefs regarding the source, justification, complexity, and certainty of knowledge. In the research reported in this article we build on established research in this area, which has typically used self-report psychometric and behavior data, and information seeking tasks involving closed-document sets. We take a novel approach in applying established self-report measures to a large-scale, naturalistic, study environment, pointing to the potential of analysis of dialogue, web-navigation – including sites visited – and other trace data, to support more traditional self-report mechanisms. Our analysis suggests that prior work demonstrating relationships between self-report indicators is not paralleled in investigation of the hypothesized relationships between self-report and trace-indicators. However, there are clear epistemic features of this trace data. The article thus demonstrates the potential of behavioral learning analytic data in understanding how epistemic cognition is brought to bear in rich information seeking and processing tasks
Molecular clouds and clumps in the Boston University-Five College Radio Astronomy Observatory Galactic Ring Survey
The Boston University-Five College Radio Astronomy Observatory (BU-FCRAO)
Galactic Ring Survey (GRS) of 13 CO (1-0) emission covers Galactic longitudes
18 deg < l < 55.7 deg and Galactic latitudes |b| <= 1 deg. Using the SEQUOIA
array on the FCRAO 14m telescope, the GRS fully sampled the 13 CO Galactic
emission (46 arcsec angular resolution on a 22 arcsec grid) and achieved a
spectral resolution of 0.21 km/s. Because the GRS uses 13 CO, an optically thin
tracer, rather than 12 CO, an optically thick tracer, the GRS allows a much
better determination of column density and also a cleaner separation of
velocity components along a line of sight. With this homogeneous, fully-sampled
survey of 13 CO, emission, we have identified 829 molecular clouds and 6124
clumps throughout the inner Galaxy using the CLUMPFIND algorithm. Here we
present details of the catalog and a preliminary analysis of the properties of
the molecular clouds and their clumps. Moreover, we compare clouds inside and
outside of the 5 kpc ring and find that clouds within the ring typically have
warmer temperatures, higher column densities, larger areas, and more clumps
compared to clouds located outside the ring. This is expected if these clouds
are actively forming stars. This catalog provides a useful tool for the study
of molecular clouds and their embedded young stellar objects.Comment: 29 pages. ApJ in pres
Infrared Sources in the Small Magellanic Cloud: First Results
We have imaged the entire Small Magellanic Cloud (SMC), one of the two nearest star-forming dwarf galaxies, in all seven IRAC and MIPS bands. The low mass and low metallicity (1/6 solar) of the SMC make it the best local analog for primitive galaxies at high redshift. By studying the properties of dust and star formation in the SMC at high resolution, we can gain understanding of similar distant galaxies that can only be observed in much less detail.
In this contribution, we present a preliminary analysis of the properties of point sources detected in the Spitzer Survey of the Small Magellanic Cloud (S^(3)MC). We find ∼400,000 unresolved or marginally resolved sources in our IRAC images, and our MIPS 24 μm mosaic contains ~17,000 point sources. Source counts decline rapidly at the longer MIPS wavelengths. We use colorcolor and color-magnitude diagrams to investigate the nature of these objects, cross-correlate their positions with those of known sources at other wavelengths, and show examples of how these data can be used to identify interesting classes of objects such as carbon stars and young stellar objects. For additional examples of some of the questions that can be studied with these data, please see the accompanying contributions by Alberto Bolatto (survey information and images), Adam Leroy (dust and gas in a low-metallicity environment), Karin Sandstrom (far infrared-radio continuum correlation), and Snezana Stanimirovic (on a young supernova remnant in the The SMC) mosaic images and point source catalogs we have made have been released to the public on our website (http://celestial.berkeley.edu/spitzer)
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