265 research outputs found

    Promoting Inclusivity in the Archive: A literature review reassessing tradition through theory and practice

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    The call for social justice and rise of postmodernism in the second half of the 20th century forced the critical re-evaluation of the traditional archive and its presumed neutral role in the collection and creation of history. Reappraisal of traditional archive theory and practice was forced by heightened critical conscious among the field and its constituents. This literature review examines contemporary methodologies and methods influenced by the postmodern movement and call for social justice in the archive. Affect theory, radical empathy, and queer/ed methodology provide new frameworks for the thinking about the archive space and work towards the creation of a more diverse and inclusive archive. The collection of oral histories and participatory, community archiving practices provide concrete methods for employing the aforementioned theories. This paper purports that these ideas may be better framed within the context of the post-postmodern movement of metamodernism and calls for the continual evaluation of archival theory and practice within this vein

    The Effect of Quadriceps Weakness in Older Adults on Lower Extremity Muscle Function During Gait

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    Osteoarthritis is a painful condition that generally causes patients to experience weak quadriceps, abnormal gait kinematics, and difficulty completing daily movements. The quadriceps muscles are a vital muscle group in the lower extremities that brake the body’s center of mass and pro- vide vertical support during activities such as walking. Previous research investigated simulated muscle compensations for quadriceps weakness in a healthy young adult population; however, no research has analyzed muscle compensations for weak quadriceps in older subjects during gait. The project determined estimated muscle compensations for simulated quadriceps weak- ness, based on changes in muscle forces and contributions to support and progression, in older healthy adults. Quadriceps weakness was simulated using the dynamic computer simulation software OpenSim, on 10 healthy older adults. The muscles that increased their peak force the most in older adults during the simulated quadriceps weakness were the medial gastrocnemius and gluteus maximus. The medial gastrocnemius and gluteus maximus increased contribution to both support and progression while the gluteus medius and soleus both increased contributions to progression. The gluteus maximus increased its peak force and contributions to support and pro- gression in both the younger and older adults with simulated quadriceps weakness. The soleus did not compensate for quadriceps weakness in older adults as much as in young adults. The me- dial gastrocnemius was found to be more of a primary compensator for older adults but not young adults.No embargoAcademic Major: Materials Science and Engineerin

    Fermi volume evolution and crystal field excitations in heavy-fermion compounds probed by time-domain terahertz spectroscopy

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    We measure the quasiparticle weight in the heavy-fermion compound CeCu6−x_{6-x}Aux_{x} (x=0, 0.1x=0,\ 0.1) by time-resolved THz spectroscopy for temperatures from 2 up to 300\,K. This method distinguishes contributions from the heavy Kondo band and from the crystal-electric-field satellite bands by different THz response delay times. We find that the formation of heavy bands is controlled by an exponentially enhanced, high-energy Kondo scale once the crystal-electric-field states become thermally occupied. We corroborate these observations by temperature-dependent dynamical mean-field calculations for the multi-orbital Anderson lattice model and discuss consequences for quantum critical scenarios.Comment: Published version, 6 pages (including references), 5 figures, Supplemental Material (2 pages) adde

    Book Reviews

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    Book Reviews

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    The Poster: A Visual History

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    Review of The Poster: A Visual History, Reviewed November 2020 by Autumn Wetli, Undergraduate Collections Librarian, University of Michigan, [email protected]

    Liquor Store Theatre

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    Review of Liquor Store Theatre, Reviewed March 2021 by Autumn Wetli, Undergraduate Collections Librarian, University of Michigan, [email protected]

    Electrometer system measures nanoamps at high voltage

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    Floating electrometer eliminates major source of error since any leakage from electrometer case, which is at high voltage, appears only as load on high voltage supply and not as part of current being measured. Commands to and data from floating electrometer are transferred across high voltage interface by means of optical channels

    Time-resolved collapse and revival of the Kondo state near a quantum phase transition

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    One of the most successful paradigms of many-body physics is the concept of quasiparticles: excitations in strongly interacting matter behaving like weakly interacting particles in free space. Quasiparticles in metals are very robust objects. Yet, when a system's ground state undergoes a qualitative change at a quantum critical point (QCP), the quasiparticles may disintegrate and give way to an exotic quantum-fluid state of matter. The nature of this breakdown is intensely debated, because the emergent quantum fluid dominates the material properties up to high temperature and might even be related to the occurence of superconductivity in some compounds. Here we trace the dynamics of heavy-fermion quasiparticles in CeCu6−x_{6-x}Aux_{x} and monitor their evolution towards the QCP in time-resolved experiments, supported by many-body calculations. A terahertz pulse disrupts the many-body heavy-fermion state. Under emission of a delayed, phase-coherent terahertz reflex the heavy-fermion state recovers, with a coherence time 100 times longer than typically associated with correlated metals. The quasiparticle weight collapses towards the QCP, yet its formation temperature remains constant -- phenomena believed to be mutually exclusive. Coexistence in the same experiment calls for revisions in our view on quantum criticality.Comment: Published version, including data on CeCu6, CeCu5.9Au0.1, and CeCu5Au1 and extended Supplementary Information. 7 pages, 4 figures, Supplementary Information: 5 pages, 3 figure

    Hepatocellular carcinoma and regenerating nodule in a 3-year-old child with Alagille syndrome

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    In Alagille syndrome, routine follow-up imaging of the liver plays an important role in detecting early parenchymal changes and to evaluate portal hypertension. Modern contrast-enhanced imaging methods not only allow early detection of focal liver lesions, but also enable further characterization of their nature and guide biopsy procedures. We present the US and MR imaging findings of hepatocellular carcinoma and a regenerating nodule in a 3-year-old child with Alagille syndrom
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