ORCID Profile
0000-0002-0325-2006
Current Organisations
University of South Australia
,
University of South Australia - Mawson Lakes Campus
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Publisher: Springer Netherlands
Date: 2012
Publisher: American Astronomical Society
Date: 14-02-2017
Publisher: Common Ground Research Networks
Date: 2007
Publisher: Common Ground Research Networks
Date: 2014
Publisher: Springer Science and Business Media LLC
Date: 24-02-2016
Publisher: Oxford University Press (OUP)
Date: 26-07-2017
Publisher: Springer Science and Business Media LLC
Date: 16-10-2017
DOI: 10.1038/NATURE24471
Abstract: On 17 August 2017, the Advanced LIGO and Virgo detectors observed the gravitational-wave event GW170817-a strong signal from the merger of a binary neutron-star system. Less than two seconds after the merger, a γ-ray burst (GRB 170817A) was detected within a region of the sky consistent with the LIGO-Virgo-derived location of the gravitational-wave source. This sky region was subsequently observed by optical astronomy facilities, resulting in the identification of an optical transient signal within about ten arcseconds of the galaxy NGC 4993. This detection of GW170817 in both gravitational waves and electromagnetic waves represents the first 'multi-messenger' astronomical observation. Such observations enable GW170817 to be used as a 'standard siren' (meaning that the absolute distance to the source can be determined directly from the gravitational-wave measurements) to measure the Hubble constant. This quantity represents the local expansion rate of the Universe, sets the overall scale of the Universe and is of fundamental importance to cosmology. Here we report a measurement of the Hubble constant that combines the distance to the source inferred purely from the gravitational-wave signal with the recession velocity inferred from measurements of the redshift using the electromagnetic data. In contrast to previous measurements, ours does not require the use of a cosmic 'distance ladder': the gravitational-wave analysis can be used to estimate the luminosity distance out to cosmological scales directly, without the use of intermediate astronomical distance measurements. We determine the Hubble constant to be about 70 kilometres per second per megaparsec. This value is consistent with existing measurements, while being completely independent of them. Additional standard siren measurements from future gravitational-wave sources will enable the Hubble constant to be constrained to high precision.
Publisher: Routledge
Date: 06-04-2023
Publisher: Cambridge University Press (CUP)
Date: 07-2012
DOI: 10.1017/AEE.2012.4
Abstract: Operation Magpie was a citizen science project that involved the community in collecting data about magpies. This article describes one aspect of the project from an education perspective. The study began with a collaboration of teacher educators, environmental scientists and a local radio station. After an initial workshop with 75 teachers, three teacher educators met regularly with 13 primary teachers who each volunteered to plan and teach a unit of work on birds. Meeting regularly in focus groups, the teachers shared their pedagogical strategies that supported students to connect with their local environment. Findings include the importance of focused professional learning for teachers through ongoing, needs-based support during the planning and teaching of the unit, and the innovative ways that teachers approached the unit. One unexpected finding was that teachers tended to identify student learning in terms of the English curriculum rather than the science curriculum.
Publisher: Informa UK Limited
Date: 2004
Publisher: Common Ground Research Networks
Date: 2013
Publisher: Common Ground Research Networks
Date: 2011
Publisher: Springer Science and Business Media LLC
Date: 02-10-2016
Publisher: Informa UK Limited
Date: 02-2008
Publisher: Università degli Studi di Torino
Date: 2018
Publisher: Cambridge University Press (CUP)
Date: 12-08-2016
DOI: 10.1017/AEE.2016.18
Abstract: The case study reported here seeks to promote the sharing of successful practice in Education for Sustainability (EfS). It uses literature and three personal and professional autobiographies as background to the development of a set of sustainability educational practices integrated into a primary/middle school teacher education program. The set of activities focus on developing in students an understanding of EfS and of processes appropriate to it that they can use in their classrooms on graduation. It is the authors’ view that their collaborative building on shared beliefs, contemporary ecojustice literature and three decades of developing enabling pedagogical practices has assisted their efforts to ‘get’ EfS, and to ensure that their students, particularly as beginning teachers, ‘got it’. The ecojustice principles for teacher education programs are outlined in this article and are believed to have wide applicability in many aspects of ecojustice approaches to pro-ecosocial education.
Location: Australia
No related grants have been discovered for David Lloyd.