19,368 research outputs found
Transition from inspiral to plunge in precessing binaries of spinning black holes
We investigate the non-adiabatic dynamics of spinning black hole binaries by
using an analytical Hamiltonian completed with a radiation-reaction force,
containing spin couplings, which matches the known rates of energy and angular
momentum losses on quasi-circular orbits. We consider both a straightforward
post-Newtonian-expanded Hamiltonian (including spin-dependent terms), and a
version of the resummed post-Newtonian Hamiltonian defined by the Effective
One-Body approach. We focus on the influence of spin terms onto the dynamics
and waveforms. We evaluate the energy and angular momentum released during the
final stage of inspiral and plunge. For an equal-mass binary the energy
released between 40Hz and the frequency beyond which our analytical treatment
becomes unreliable is found to be, when using the more reliable Effective
One-Body dynamics: 0.6% M for anti-aligned maximally spinning black holes, 5% M
for aligned maximally spinning black hole, and 1.8% M for non-spinning
configurations. In confirmation of previous results, we find that, for all
binaries considered, the dimensionless rotation parameter J/E^2 is always
smaller than unity at the end of the inspiral, so that a Kerr black hole can
form right after the inspiral phase. By matching a quasi-normal mode ringdown
to the last reliable stages of the plunge, we construct complete waveforms
approximately describing the gravitational wave signal emitted by the entire
process of coalescence of precessing binaries of spinning black holes.Comment: 31 pages, 7 tables, and 13 figure
Animal-Assisted Interventions in Health Care Settings: A Best Practices Manual for Establishing New Programs: Volunteer Manual Template
This document accompanies Animal-Assisted Interventions in Health Care Settings: A Best Practices Manual for Establishing New Programs (Purdue Press, 2019) and serves as a template for readers to personalize for their facility. The generic terms âABC Health Care Facilityâ and âAAI Programâ are intended to be replaced by the names of the reader\u27s facility and AAI program.
The book can be purchased from Purdue University Press
A content analysis of tobacco content in season 1 of âAnd Just Like Thatâ
Aim: âSex and the Cityâ regularly featured smoking as a plot device, often linked with sexuality and female empowerment. Eighteen years later, the follow up âAnd Just Like Thatâ was released. The aim of this paper was to explore the amount of tobacco content in the first series of âAnd Just Like Thatâ.
Subject and Methods: A 1-minute content analysis of the 10 episodes from season1 of âAnd Just Like Thatâ.
Results: The 10 episodes included 394 one-minute intervals of content, with individual episodes ranging from 35-44 minutes. Tobacco content occurred in 45 intervals (11% of the total) across all 10 episodes.
Conclusion: This study demonstrates that, despite the 18-year age gap between the end of the âSex and the Cityâ TV series and the start of âAnd just like thatâ, and the declining smoking rates during that time, tobacco content is still regularly featured in these programmes. Whilst viewing figures are not available for this series, we know that this was HBO Maxâs most streamed show of all time and was highly popular, it is, therefore, likely that large numbers of people were exposed to tobacco content through this programme
Implementation of a local principal curves algorithm for neutrino interaction reconstruction in a liquid argon volume
A local principal curve algorithm has been implemented in three dimensions
for automated track and shower reconstruction of neutrino interactions in a
liquid argon time projection chamber. We present details of the algorithm and
characterise its performance on simulated data sets.Comment: 14 pages, 17 figures; typing correction to Eq 5, the definition of
the local covariance matri
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Recent developments in the treatment of Parkinson's Disease.
Parkinson's disease (PD) is a common neurodegenerative disease typified by a movement disorder consisting of bradykinesia, rest tremor, rigidity, and postural instability. Treatment options for PD are limited, with most of the current approaches based on restoration of dopaminergic tone in the striatum. However, these do not alter disease course and do not treat the non-dopamine-dependent features of PD such as freezing of gait, cognitive impairment, and other non-motor features of the disorder, which often have the greatest impact on quality of life. As understanding of PD pathogenesis grows, novel therapeutic avenues are emerging. These include treatments that aim to control the symptoms of PD without the problematic side effects seen with currently available treatments and those that are aimed towards slowing pathology, reducing neuronal loss, and attenuating disease course. In this latter regard, there has been much interest in drug repurposing (the use of established drugs for a new indication), with many drugs being reported to affect PD-relevant intracellular processes. This approach offers an expedited route to the clinic, given that pharmacokinetic and safety data are potentially already available. In terms of better symptomatic therapies that are also regenerative, gene therapies and cell-based treatments are beginning to enter clinical trials, and developments in other neurosurgical strategies such as more nuanced deep brain stimulation approaches mean that the landscape of PD treatment is likely to evolve considerably over the coming years. In this review, we provide an overview of the novel therapeutic approaches that are close to, or are already in, clinical trials
Optomechanical cooling of levitated spheres with doubly-resonant fields
Optomechanical cooling of levitated dielectric particles represents a
promising new approach in the quest to cool small mechanical resonators towards
their quantum ground state. We investigate two-mode cooling of levitated
nanospheres in a self-trapping regime. We identify a rich structure of split
sidebands (by a mechanism unrelated to usual strong-coupling effects) and
strong cooling even when one mode is blue detuned. We show the best regimes
occur when both optical fields cooperatively cool and trap the nanosphere,
where cooling rates are over an order of magnitude faster compared to
corresponding single-sideband cooling rates.Comment: 8 Pages, 7 figure
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