7,594 research outputs found

    [Review of] Aldon Lynn Nielsen, ed. Reading Race in American Poetry: An Area of Act

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    For some time now it has been fashionable when reviewing any sort of anthology to focus critical lens on what the anthology leaves out. In both formal and informal reviews of literary anthologies and collections of essays what an editor does not include in his or her text often takes precedent over the relative virtues of the texts actually appearing in the anthology itself. In the most postmodern of moments, absence erases presence

    Information Literacy and the Undergraduate Curriculum

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    published or submitted for publicatio

    “yellow crowfoot in the pond,/not lotus, not lily”: Mapping the River, Mapping Voices

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    This paper examines the prosody of Chin’s eponymous poem, The Phoenix Gone, The Terrace Empty, through an eco-critical lens. While it does not dismiss the hybrid cultural influences of the poem, it focuses on the ways the non-human agents, or the figures in the poem’s landscape, “speak.” Poetry, like the poem’s terraced gardens, traces tension between the controlling human forces experienced by the narrating female I personas and the natural world’s affective inclinations

    Finite Correlation Length Scaling in Lorentz-Invariant Gapless iPEPS Wave Functions

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    It is an open question how well tensor network states in the form of an infinite projected entangled pair states (iPEPS) tensor network can approximate gapless quantum states of matter. Here we address this issue for two different physical scenarios: i) a conformally invariant (2+1)d(2+1)d quantum critical point in the incarnation of the transverse field Ising model on the square lattice and ii) spontaneously broken continuous symmetries with gapless Goldstone modes exemplified by the S=1/2S=1/2 antiferromagnetic Heisenberg and XY models on the square lattice. We find that the energetically best wave functions display {\em finite} correlation lengths and we introduce a powerful finite correlation length scaling framework for the analysis of such finite-DD iPEPS states. The framework is important i) to understand the mild limitations of the finite-DD iPEPS manifold in representing Lorentz-invariant, gapless many body quantum states and ii) to put forward a practical scheme in which the finite correlation length Îľ(D)\xi(D) combined with field theory inspired formulae can be used to extrapolate the data to infinite correlation length, i.e. to the thermodynamic limit. The finite correlation length scaling framework opens the way for further exploration of quantum matter with an (expected) Lorentz-invariant, massless low-energy description, with many applications ranging from condensed matter to high-energy physics.Comment: 16 pages, 11 figure

    Experimental Investigation of Launch Vehicle Transient Input Simulation in Payload Tests

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    The technique of electronically simulating the structural dynamics of a launch vehicle in transient tests of payloads using multiple vibration excitation systems was investigated. The development of computer programs to determine transfer functions, synthesize shaker forcing functions, and control vibration exciters is described. A demonstration test using the techniques was described and results are presented. The evaluation of the potential for applying this technique to large Shuttle payloads is discussed

    Reinforcement of polymeric structures with asbestos fibrils

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    Investigation determines structural potential of asbestos fibrils. Methods are developed for dispersing macrofibers of the asbestos into colloidal-sized ultimate fibrils and incorporating these fibrils in matrices without causing reagglomeration

    Analytical study of lightweight acoustic shrouds for shuttle experiments and payloads

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    Results are presented of acoustic tests performed on an STS payload shroud simulator to determine the effects of a helium filled liner on the noise reduction characteristics. The basic test program included the following configurations: (1) bare shroud (baseline configuration); (2) shroud with empty liner; (3) shroud with liner filled with air; and (4) shroud with liner filled with helium. The results indicate negligible effects from the helium. Configurations for liner filled with air, and liner filled with helium were also tested. The data from these configurations indicate increased noise reduction from the use of helium

    Monitoring cardiovascular function in the primate under prolonged weightlessness

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    Monitoring cardiovascular function in primates under prolonged weightlessnes
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