8,701 research outputs found
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Navigating the Turbulent Waters of School Reform Guided by Complexity Theory
The goal of this research study has been to develop, implement, and evaluate a school reform design experiment at a continuation high school with low-income, low-performing underrepresented minority students. The complexity sciences served as a theoretical framework for this design experiment. Treating an innovative college preparatory program as a nested complex adaptive system within a larger complex adaptive system, the school, we used features of complex adaptive systems (equilibrium, emergence, self-organization, and feedback loops) as a framework to design a strategy for school reform. The goal was to create an environment for change by pulling the school far from equilibrium using a strategy we call “purposeful perturbations” to disrupt the stable state of the school in a purposeful way. Over the four years of the study, several tipping points were reached, and we developed agent-based simulation models that capture important dynamic properties of the reform at these points. The study draws upon complexity theory in multiple ways that have supported improved education for low-achieving students
Zoom-Whirl Orbits in Black Hole Binaries
Zoom-whirl behavior has the reputation of being a rare phenomenon. The
concern has been that gravitational radiation would drain angular momentum so
rapidly that generic orbits would circularize before zoom-whirl behavior could
play out, and only rare highly tuned orbits would retain their imprint. Using
full numerical relativity, we catch zoom-whirl behavior despite dissipation.
The larger the mass ratio, the longer the pair can spend in orbit before
merging and therefore the more zooms and whirls seen. Larger spins also enhance
zoom-whirliness. An important implication is that these eccentric orbits can
merge during a whirl phase, before enough angular momentum has been lost to
truly circularize the orbit. Waveforms will be modulated by the harmonics of
zoom-whirls, showing quiet phases during zooms and louder glitches during
whirls.Comment: Replaced with published versio
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Education as a Complex System: Conceptual and Methodological Implications
Education is a complex system, which has conceptual and methodological implications for education research and policy. In this article, an overview is first provided of the Complex Systems Conceptual Framework for Learning (CSCFL), which consists of a set of conceptual perspectives that are generally shared by educational complex systems, organized into two focus areas: collective behaviors of a system, and behaviors of individual agents in a system. Complexity and research methodologies for education are then considered, and it is observed that commonly used quantitative and qualitative techniques are generally appropriate for studying linear dynamics of educational systems. However, it is proposed that computational modeling approaches, being extensively used for studying nonlinear characteristics of complex systems in other fields, can provide a methodological complement to quantitative and qualitative education research approaches. Two research case studies of this approach are discussed. We conclude with a consideration of how viewing education as a complex system using complex systems’ conceptual and methodological tools can help advance education research and also inform policy
Measurable Dynamics of Maps on Profinite Groups
We study the measurable dynamics of transformations on profinite groups, in
particular of those which factor through sufficiently many of the projection
maps; these maps generalize the 1-Lipschitz maps on .Comment: 18 page
ADA Mediation After Sutton, Murphy and Albertson
Judith Cohen\u27s summary of the Interim ADA Mediation Standards in the last issue of The Journal of Alternative Dispute Resolution in Employment acknowledges the skyrocketing number of cases mediated under the Americans With Disabilities Act (ADA). The United States Supreme Court\u27s recent opinions in Sutton v. United Airlines, Inc., Murphy v. United Parcel Service, Inc., and Albertson, Inc. v. Kirkingberg surprised many in the disability community by explicitly excluding an individual from ADA coverage if she mitigates her mental or physical impairment and the impairment as mitigated no longer substantially limits a major life activity. Will the Supreme Court\u27s narrowing interpretation of the definition of disability ground the skyrockets, or, as I suggest below, will the number of mediations in ADA cases continue to soar
Semiconductor crystal high resolution imager
A radiation imaging device (10). The radiation image device (10) comprises a subject radiation station (12) producing photon emissions (14), and at least one semiconductor crystal detector (16) arranged in an edge-on orientation with respect to the emitted photons (14) to directly receive the emitted photons (14) and produce a signal. The semiconductor crystal detector (16) comprises at least one anode and at least one cathode that produces the signal in response to the emitted photons (14)
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