Narrowband Searches for Continuous and Long-duration Transient Gravitational Waves from Known Pulsars in the LIGO-Virgo Third Observing Run

Isolated neutron stars that are asymmetric with respect to their spin axis are possible sources of detectable continuous gravitational waves. This paper presents a fully coherent search for such signals from eighteen pulsars in data from LIGO and Virgo's third observing run (O3). For known pulsars, efficient and sensitive matched-filter searches can be carried out if one assumes the gravitational radiation is phase-locked to the electromagnetic emission. In the search presented here, we relax this assumption and allow both the frequency and the time derivative of the frequency of the gravitational waves to vary in a small range around those inferred from electromagnetic observations. We find no evidence for continuous gravitational waves, and set upper limits on the strain amplitude for each target. These limits are more constraining for seven of the targets than the spin-down limit defined by ascribing all rotational energy loss to gravitational radiation. In an additional search, we look in O3 data for long-duration (hours-months) transient gravitational waves in the aftermath of pulsar glitches for six targets with a total of nine glitches. We report two marginal outliers from this search, but find no clear evidence for such emission either. The resulting duration-dependent strain upper limits do not surpass indirect energy constraints for any of these targets. © 2022. The Author(s). Published by the American Astronomical Society

Urban blue: A global analysis of the factors shaping people's perceptions of the marine environment and ecological engineering in harbours.

Marine harbours are the focus of a diverse range of activities and subject to multiple anthropogenically induced pressures. Support for environmental management options aimed at improving degraded harbours depends on understanding the factors which influence people's perceptions of harbour environments. We used an online survey, across 12 harbours, to assess sources of variation people's perceptions of harbour health and ecological engineering. We tested the hypotheses: 1) people living near impacted harbours would consider their environment to be more unhealthy and degraded, be more concerned about the environment and supportive of and willing to pay for ecological engineering relative to those living by less impacted harbours, and 2) people with greater connectedness to the harbour would be more concerned about and have greater perceived knowledge of the environment, and be more supportive of, knowledgeable about and willing to pay for ecological engineering, than those with less connectedness. Across twelve locations, the levels of degradation and modification by artificial structures were lower and the concern and knowledge about the environment and ecological engineering were greater in the six Australasian and American than the six European and Asian harbours surveyed. We found that people's perception of harbours as healthy or degraded, but not their concern for the environment, reflected the degree to which harbours were impacted. There was a positive relationship between the percentage of shoreline modified and the extent of support for and people's willingness to pay indirect costs for ecological engineering. At the individual level, measures of connectedness to the harbour environment were good predictors of concern for and perceived knowledge about the environment but not support for and perceived knowledge about ecological engineering. To make informed decisions, it is important that people are empowered with sufficient knowledge of the environmental issues facing their harbour and ecological engineering options

Intertwining offline and online channels in multi-channel public service delivery: A case study

Academy of Management 2005 Annual Meeting: A New Vision of Management in the 21st Century, AOM 200

Resource enactment in e-government systems implementation: A case study on the E-File System in Singapore

ICIS 2006 Proceedings - Twenty Seventh International Conference on Information Systems483-49

Ocular surface changes in pterygium

10.1097/00003226-200201000-00009Cornea21138-42CORN

E-government implementation: A macro analysis of Singapore's e-government initiatives

10.1016/j.giq.2006.04.011Government Information Quarterly252239-255GIQU

Recognition and participation in a virtual community

Proceedings of the Hawaii International Conference on System Sciences373025-3034PHIS

Microsporidial keratoconjunctivitis in healthy individuals: A case series

10.1016/S0161-6420(03)00448-2Ophthalmology11071420-1425OPHT

Comparison of eye-tracking success in laser in situ keratomileusis after flap creation with 2 femtosecond laser models

10.1016/j.jcrs.2010.10.039Journal of Cataract and Refractive Surgery373538-543JCSU

Conventional versus accelerated collagen cross-linking for keratoconus: A comparison of visual, refractive, topographic and biomechanical outcomes

10.2174/1874364101711010262Open Ophthalmology Journal11262-27