6,944 research outputs found
Differential rotation of relativistic superfluid in neutron stars
It is shown how to set up a mathematically elegant and fully relativistic
superfluid model that can provide a realistic approximation (neglecting small
anisotropies due to crust solidity, magnetic fields, et cetera, but allowing
for the regions with vortex pinning) of the global structure of a rotating
neutron star, in terms of just two independently moving constituents, one of
which represents the differentially rotating neutron superfluid, while the
other part represents the combination of all the other ingredients, including
the degenerate electrons, the superfluid protons in the core, and the ions in
the crust, whose electromagnetic interactions will tend to keep them locked
together in a state of approximately rigid rotation. Order of magnitude
estimates are provided for relevant parameters such as the resistive drag
coefficient and the maximum pinning force.Comment: 35 pages, Latex, no figure, submitted to M.N.R.A.
Media Coverage of Law Enforcement Use of Force and Disability
Disability intersects with other factors such as race, class, gender, and sexuality, to magnify degrees of marginalization and increase the risk of violence. When the media ignores or mishandles a major factor, as we contend they generally do with disability, it becomes harder to effect change.This white paper focuses on the three years of media coverage of police violence and disability since the death of a young man with Down syndrome, named Ethan Saylor, in January 2013. After reviewing media coverage of eight selected cases of police violence against individuals with disabilities, the paper reveals the following patterns in the overall data:? Disability goes unmentioned or is listed as an attribute without context.? An impairment is used to evoke pity or sympathy for the victim.? A medical condition or "mental illness" is used to blame victims for their deaths.? In rare instances, we have identified thoughtful examinations of disability from within its social context that reveal the intersecting forces that lead to dangerous use-of-force incidents. Such stories point the way to better models for policing in the future. We conclude by proposing best practices for reporting on disability and police violence
Cultivated Positive Emotions Inspire Environmentally Responsible Behaviors
Existing environmental problems, such as climate change and species extinction, are partially the result of human behavior. Attempts to motivate people to reduce and alter consumption behaviors have primarily relied on the summoning of negative emotions. The author elaborates a comprehensive theory, supported by empirical evidence, showing how positive emotions can be more effective at inspiring environmentally responsible behaviors. B. L. Fredricksonâs (1998, 2001) broaden-and-build theory of positive emotions is used to demonstrate how cultivated positive emotions can, expand peopleâs awareness that they are a connected part of the Earthâs living system, increase their capacity to creatively and effectively address environmental problems, and help them recognize that well-being and environmental health go hand in hand
Gait Extraction and Description by Evidence-Gathering
Using gait as a biometric is of increasing interest, yet there are few model-based, parametric, approaches to extract and describe moving articulated objects. One new approach can detect moving parametric objects by evidence gathering, hence accruing known performance advantages in terms of performance and occlusion. Here we show how that the new technique can be extended not only to extract a moving person, but also to extract and concurrently provide a gait signature for use as a biometric. We show the natural relationship between the bases of these approaches, and the results they can provide. As such, these techniques allow for gait extraction and description for recognition purposes, and with known performance advantages of a well-established vision technique
Novel Rbfox2 isoforms associated with alternative exon usage in rat cortex and suprachiasmatic nucleus
Abstract Transcriptome diversity in adult neurons is partly mediated by RNA binding proteins (RBPs), including the RBFOX factors. RBFOX3/NeuN, a neuronal maturity marker, is strangely depleted in suprachiasmatic nucleus (SCN) neurons, and may be compensated by a change in Rbfox2 expression. In this study, we found no superficial changes in Rbfox2 expression in the SCN, but mRNA population analysis revealed a distinct SCN transcript profile that includes multiple novel Rbfox2 isoforms. Of eleven isoforms in SCN and cerebral cortex that exhibit exon variation across two protein domains, we found a 3-fold higher abundance of a novel (ââ12â40â) C-terminal domain (CTD)-variant in the SCN. This isoform embraces an alternative reading frame that imparts a 50% change in CTD protein sequence, and functional impairment of exon 7 exclusion activity in a RBFOX2-target, the L-type calcium channel gene, Cacna1c. We have also demonstrated functional correlates in SCN gene transcripts; inclusion of Cacna1c exon 7, and also exclusion of both NMDA receptor gene Grin1 exon 4, and Enah exon 12, all consistent with a change in SCN RBFOX activity. The demonstrated regional diversity of Rbfox2 in adult brain highlights the functional adaptability of this RBP, enabling neuronal specialization, and potentially responding to disease-related neuronal dysfunction
Extremal Black Hole/CFT Correspondence in (Gauged) Supergravities
We extend the investigation of the recently proposed Kerr/CFT correspondence
to large classes of rotating black hole solutions in gauged and ungauged
supergravities. The correspondence, proposed originally for four-dimensional
Kerr black holes, asserts that the quantum states in the near-horizon region of
an extremal rotating black hole are holographically dual to a two-dimensional
chiral theory whose Virasoro algebra arises as an asymptotic symmetry of the
near-horizon geometry. In fact in dimension D there are [(D-1)/2] commuting
Virasoro algebras. We consider a general canonical class of near-horizon
geometries in arbitrary dimension D, and show that in any such metric, the
[(D-1)/2] central charges each imply, via the Cardy formula, a microscopic
entropy that agrees with the Bekenstein-Hawking entropy of the associated
extremal black hole. In the remainder of the paper we show for most of the
known rotating black hole solutions of gauged supergravity, and for the
ungauged supergravity solutions with four charges in D=4 and three charges in
D=5, that their extremal near-horizon geometries indeed lie within the
canonical form. This establishes that in all these examples, the microscopic
entropies of the dual CFTs agree with the Bekenstein-Hawking entropies of the
extremal rotating black holes.Comment: 32 pages, references added and minor typos fixe
NEOS Operation Center
This report covers the activities of the NEOS Operation Center at USNO for 2012. The Operation Center schedules the IVS-R4 and the INT1 Intensive experiments
Bogomol'nyi Limit For Magnetic Vortices In Rotating Superconductor
This work is the sequel of a previous investigation of stationary and
cylindrically symmetric vortex configurations for simple models representing an
incompressible non-relativistic superconductor in a rigidly rotating
background. In the present paper, we carry out our analysis with a generalized
Ginzburg-Landau description of the superconductor, which provides a
prescription for the radial profile of the normal density within the vortex.
Within this framework, it is shown that the Bogomol'nyi limit condition marking
the boundary between type I and type II behavior is unaffected by the rotation
of the background.Comment: 7 pages, uses RevTeX, submitted to Phys.Rev.
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