980 research outputs found
Endovascular exclusion of a saccular aortic aneurysm using a septal occluder device
Endovascular repair of aneurysms involving the visceral segment of the abdominal aorta still remains a challenge. We report a patient with a large saccular aneurysm involving the visceral segment of the abdominal aorta that was ultimately excluded by endovascular deployment of an Amplatzer atrial septal occluder device (AGA Medical/St. Jude Medical, St Paul, Minn)
New Technology Focus: Smart Polymer in Vascular Surgery
A new smart polymer technology developed by Shape Memory Medical is available to endovascular specialists. The shape memory polymer is incorporated into vascular plugs and coils. Dr Ross Milner, a vascular surgeon at University of Chicago Medicine, gives his perspective on the properties of the shape memory polymer and how smart polymer devices may be used in vascular surgery
Editorial: Intubation through supraglottic airways: Are we on target, or just passing through?
No Abstrac
The condition of the working class: Representation and praxis
Copyright © 2013 Immanuel Ness and Wiley Periodicals, Inc. This is the accepted version of the following article: Wayne, M. and O'Neill, D. (2013), The Condition of the Working Class: Representation and Praxis. WorkingUSA, 16: 487–503, which has been published in final form at http://onlinelibrary.wiley.com/doi/10.1111/wusa.12076/abstract.This essay reflects critically on the political context, production process, ideas, and strategies of our feature-length documentary film The Condition of the Working Class. It explores why we were inspired by Friedrich Engels' 1844 book of the same name and how that book connects with the contemporary neoliberal capitalist project that has dominated the political scene internationally for several decades. We conceptualize our film as a constellation, in the manner of Walter Benjamin, between the 1840s and the contemporary moment. The essay explores the production process of the film, which involved setting up and working in conjunction with a theatrical project. The essay reflects on the theatrical work of John McGrath and its connections with our own work. In the final section of the essay, the authors consider the finished film in more detail, analyzing how the film focused on the process of theatrical production and contextualized that process within wider spatial and temporal frames. The film and the theater project explore the possibility of reconstituting in a microcosm a working class collective subject that has been atomized and demonized by 30 years of neoliberal policy, which in the context of the present economic crisis seeks to drive its project even further
Observation of mHz-level cooperative Lamb shifts in an optical atomic clock
We report on the direct observation of resonant electric dipole-dipole
interactions in a cubic array of atoms in the many-excitation limit. The
interactions, mediated by single-atom couplings to the shared electromagnetic
vacuum, are shown to produce spatially-dependent cooperative Lamb shifts when
spectroscopically interrogating the mHz-wide optical clock transition in
strontium-87. We show that the ensemble-averaged shifts can be suppressed below
the level of evaluated systematic uncertainties for state-of-the-art optical
atomic clocks. Additionally, we demonstrate that excitation of the atomic
dipoles near a Bragg angle can enhance these effects by nearly an order of
magnitude compared to non-resonant geometries. Given the remarkable precision
of frequency measurements and the high accuracy of the modeled response, our
work demonstrates that such a clock is a novel platform for studies of the
quantum many-body physics of spins with long-range interactions mediated by
propagating photons
A helical-shape scintillating fiber trigger and tracker system for the DarkLight experiment and beyond
The search for new physics beyond the Standard Model has interesting
possibilities at low energies. For example, the recent 6.8 anomaly
reported in the invariant mass of pairs from nuclear
transitions and the discrepancy between predicted and measured values of muon
g-2 give strong motivations for a protophobic fifth-force model. At low
energies, the electromagnetic interaction is well understood and produces
straightforward final states, making it an excellent probe of such models.
However, to achieve the required precision, an experiment must address the
substantially higher rate of electromagnetic backgrounds. In this paper, we
present the results of simulation studies of a trigger system, motivated by the
DarkLight experiment, using helical-shape scintillating fibers in a solenoidal
magnetic field to veto electron-proton elastic scattering and the associated
radiative processes. We also assess the performance of a tracking detector for
lepton final states using scintillating fibers in the same setup
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