6,646 research outputs found

    Symmetry analysis of the 1+1 dimensional relativistic imperfect fluid dynamics

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    The flow of the relativistic imperfect fluid in two dimensions is discussed. We calculate the symmetry group of the energy-momentum tensor conservation equation in the ultrarelativistic limit. Group-invariant solutions for the incompressible fluid are obtainedComment: 11 pages PS format at http://theor1.ifa.ro/~alexa/iop.p

    Teaching Nutrition and Health in the Urban-Science Classroom A Blended-Approach to Culturally Relevant, and Problem Based Learning.

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    Education has been seen as the means for all young people to receive equal opportunities, however our current system of education does not currently set up all young people to have similar achievements in the field of science. Young people from urban and impoverished backgrounds are less likely to see value or purpose in their science education. For this reason it is my belief that something needs to change in the way we educate urban youth in the field science. This project aims to unite currently supported practices and theories in to a cohesive educational unit. This unit will pull from multiple research supported theories and combine them in a unique manner to create a new experience for urban students with in the context of nutrition and human body systems. This unit will unite the notion that urban students value inquiry more than their suburban peers (Sandoval & Harven 2011), with an approach that values the unique funds of knowledge within a diverse urban classroom (Moll& Greenberg 1990). In addition an students will complete an end of the unit project that aligns itself with social justice theory (Esposito, J. & Swain 2009), and problem-based learning (Bouillion & Gomez 2001). Using a variety of techniques and researched based theories within a single unit of study will best address the engagement based issues within the urban science classroom

    Synthesis and Cyclotrimerization of Sulfonyl Enynes

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    The synthesis of complex, polysubstituted aromatic rings from simple, non-aromatic building blocks is a consistent challenge to the synthetic community. Neopentylene ring fusions are found in several natural products but are largely absent from synthetic compound libraries. This discrepancy reflects the limitations in modern chemical synthesis. Utilizing, in part, a thoroughly developed fragmentation/olefination methodology from the Dudley Lab, a library of novel 1-sulfonyl-1,6-enynes have been developed. In this methodology, they are prepared in three steps from dimedone (5,5-dimethyl-1,3-cyclohexanedione), an inexpensive starting material. A total of 14 novel 1-sulfonyl-1,6-enynes were synthesized. These substrates were subjected to a novel benzannulation reaction based on metal-catalyzed [2 + 2 + 2] cyclotrimerization methodology. The nickel-catalyzed reaction of sulfonyl enyne with an exogenous alkyne partners and in situ elimination of phenylsulfinic acid provides neopentylene-fused indane cores. The novel methodologies presented herein were used to shorten the synthesis of neoprofen, a synthetic analogue of ibuprofen, from ten steps to seven. Improved access to neopentylene-tethered 1,6-enynes advances target- and diversity-oriented synthesis, expanding synthetic libraries

    Temporal Negative Priming: Visual and Auditory

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    Recently Kahan, Slowiaczek, and Altschuler (2017) reported a new form of negative priming, termed temporal negative priming. The purpose of the current study was to first replicate this effect using a slightly altered methodology and then to examine possible mechanisms that contribute to temporal negative priming and the extent to which this effect might generalize across modalities. By requiring participants to attend to both the distractor and target stimuli, the first experiment found robust temporal negative priming effects. The second study explored whether temporal negative priming is in part caused by difficulty binding features of a target with a temporal position that was previously associated with features of a distractor (Park & Kanwisher, 1994). Results were inconclusive but are consistent with the possibility that feature mismatch theory may not be the causal mechanism behind this effect. In addition, the data support memory-based over inhibition-based theories, but additional research is needed to determine if this memory-based negative priming effect is sensitive to manipulations which affect memory retrieval. The final study found temporal negative priming within the auditory modality as well. Fifty-seven individuals participated in the first experiment, 49 individuals participated in the second experiment and 38 individuals participated in the final experiment. Similar to other negative priming studies, participants were shown prime-probe trial pairs. However, in all of the studies reported here, prime-probe trial pairs were shown at different timing sequences to help separate the effects of temporal location and response

    No Simple Formula: Navigating Tensions in Teaching Postsecondary Social Justice Mathematics

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    Instructors of Social Justice Mathematics (SJM) have shared important insights into the powerful potential of connecting classroom mathematics with authentic data about social justice topics, but they have also warned about the harm such teaching can cause when done poorly. In this article, I consider what is necessary to teach SJM at the postsecondary level. I share research that has supported me in learning to teach SJM and highlight challenges that are particular to doing this work in postsecondary contexts. I then describe my experiences navigating the central tensions of this work while honoring its complexity

    A bird’s eye view of the Malheur Wildlife Refuge occupation: Nonhuman agency and entangled species

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    In January 2016, armed militants occupied the Malheur National Wildlife Refuge, demanding an end to government control of the Refuge and other similarly protected public lands. Public discourse about the occupation highlights ongoing tensions around land use, property rights, and government overreach. The discourse foregrounds human animal concerns and all but erases nonhuman animal agency. This essay considers nonhuman animal agency and the entanglement of humans, nonhumans, and the land as seen in the occupation and surrounding discourse. We draw from critical animal studies and feminist posthuman theory to examine how discourses of the occupation produce and reinforce a sense of human exceptionalism that elides a more useful and nuanced understanding of human–nonhuman–land relatedness and agency. The analysis shows how, in the case of the Malheur occupation, occupiers and critics alike rely on discourses of “othering” towards both nonhuman animals and other humans. We take a “birding” perspective on the occupation to show how the webs of relationality that connect humans, nonhumans, and the land might be activated as an antidote to destructive discourses of human exceptionalism

    Concurrent optimization technique for a controlled structure

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    Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/76192/1/AIAA-1994-1631-489.pd

    Elastic Form Factors of 3,4^{3,4}He up to Large Q2Q^2

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    Elastic electron scattering off 3^3He and 4^4He has recently been studied at forward and backward scattering angles in Hall A at JLab. The results will provide accurate data on the elastic form factors, charge and magnetic for 3^3He and charge only for 4^4He, up to squared momentum transfer Q2Q^2-values of 3.2 GeV2^2.Comment: 3 pages, Proceedings of EFB2
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