499 research outputs found
Urban Planning by Experiment at Precinct Scale: Embracing Complexity, Ambiguity, and Multiplicity
Urban living labs have emerged as spatially embedded arenas for governing urban transformation, where heterogenous actor configurations experiment with new practices, institutions, and infrastructures. This article observes a nascent shift towards experimentation at the precinct scale and responds to a need to further investigate relevant processes in urban experimentation at this scale, and identifies particular challenges for urban planning. We tentatively conceptualise precincts as spatially bounded urban environments loosely delineated by a particular combination of social or economic activity. Our methodology involves an interpretive systematic literature review of urban experimentation and urban living labs at precinct scale, along with an empirical illustration of the Net Zero Initiative at Monash University in Melbourne, Australia, which is operationalising its main campus into a living lab focussed on precinct-scale decarbonisation. We identify four processual categories relevant to precinct-scale experimentation: embedding, framing, governing, and learning. We use the empirical illustration to discuss the relevance of these processes, refine findings from the literature review and conclude with a discussion on the implications of our article for future scholarship on urban planning by experiment at precinct scale
Interview with Rob Hauf
Rob Hauf talks about supplying food for Kenyon.https://digital.kenyon.edu/elfs_interviews/1071/thumbnail.jp
Methodological Review of First Interview
Molly Sharp recounts her interview with Rob Haufhttps://digital.kenyon.edu/elfs_interviews/1072/thumbnail.jp
Managing Supply Chain Networks: A Framework for Achieving Superior Performance through Leadership Capabilities Development in Supply Chain Node
Leadership capability is acknowledged as a major challenge for organizations and a pre-requisite for sustaining high levels of organizational performance and supply chain competitiveness. Recent research highlights how globalisation has led to the extension of domestic supply chains, particularly SME ones, to include both suppliers and customers globally. This paper examines the role capabilities development in managers and leaders as nexus of their supply chain networks have to play in achieving better performance through case studies. Once banished to the backburners of business management thinking, leveraging core leadership competencies is now critical to company‟s superior performance in supply chain networks
Quantifying the effects of spatial resolution and noise on galaxy metallicity gradients
Metallicity gradients are important diagnostics of galaxy evolution, because
they record the history of events such as mergers, gas inflow and
star-formation. However, the accuracy with which gradients can be measured is
limited by spatial resolution and noise, and hence measurements need to be
corrected for such effects. We use high resolution (~20 pc) simulation of a
face-on Milky Way mass galaxy, coupled with photoionisation models, to produce
a suite of synthetic high resolution integral field spectroscopy (IFS)
datacubes. We then degrade the datacubes, with a range of realistic models for
spatial resolution (2 to 16 beams per galaxy scale length) and noise, to
investigate and quantify how well the input metallicity gradient can be
recovered as a function of resolution and signal-to-noise ratio (SNR) with the
intention to compare with modern IFS surveys like MaNGA and SAMI. Given
appropriate propagation of uncertainties and pruning of low SNR pixels, we show
that a resolution of 3-4 telescope beams per galaxy scale length is sufficient
to recover the gradient to ~10-20% uncertainty. The uncertainty escalates to
~60% for lower resolution. Inclusion of the low SNR pixels causes the
uncertainty in the inferred gradient to deteriorate. Our results can
potentially inform future IFS surveys regarding the resolution and SNR required
to achieve a desired accuracy in metallicity gradient measurements.Comment: 21 pages, 11 figures, 20 pages Supplementary Online Material provided
with 10 additional figures, accepted for publication in MNRA
Infrared-Faint Radio Sources are at high redshifts
Context: Infrared-Faint Radio Sources (IFRS) are characterised by relatively
high radio flux densities and associated faint or even absent infrared and
optical counterparts. The resulting extremely high radio-to-infrared flux
density ratios up to several thousands were previously known only for
High-redshift Radio Galaxies (HzRGs), suggesting a link between the two classes
of object. Prior to this work, no redshift was known for any IFRS in the
Australia Telescope Large Area Survey (ATLAS) fields which would help to put
IFRS in the context of other classes of object, especially of HzRGs. Aims: This
work aims at measuring the first redshifts of IFRS in the ATLAS fields.
Further, we test the hypothesis that IFRS are similar to HzRGs, as
higher-redshift or dust-obscured versions of these massive galaxies. Methods: A
sample of IFRS was spectroscopically observed using the Focal Reducer and Low
Dispersion Spectrograph 2 (FORS2) at the Very Large Telescope (VLT). The data
were calibrated based on the Image Reduction and Analysis Facility (IRAF) and
redshifts extracted. This information was then used to calculate rest-frame
luminosities, and to perform the first spectral energy distribution modelling
of IFRS based on redshifts. Results: We found redshifts of 1.84, 2.13, and
2.76, for three IFRS, confirming the suggested high-redshift character of this
class of object. These redshifts as well as the resulting luminosities show
IFRS to be similar to HzRGs. We found further evidence that fainter IFRS are at
even higher redshifts. Conclusions: Considering the similarities between IFRS
and HzRGs substantiated in this work, the detection of IFRS, which have a
significantly higher sky density than HzRGs, increases the number of Active
Galactic Nuclei in the early universe and adds to the problems of explaining
the formation of supermassive black holes shortly after the Big Bang.Comment: 7 pages, 4 figures; version in prin
IFU observations of luminous type II AGN - I. Evidence for ubiquitous winds
We present observations of 17 luminous (log(L[O III]/L_Sun) > 8.7) local (z <
0.11) type II AGN. Our aim is to investigate the prevalence and nature of AGN
driven outflows in these galaxies by combining kinematic and ionization
diagnostic information. We use non-parametric methods (e.g. W80, the width
containing 80% of the line flux) to assess the line widths in the central
regions of our targets. The maximum values of W80 in each galaxy are in the
range 400 - 1600 km/s, with a mean of 790 +- 90 km/s. Such high velocities are
strongly suggestive that these AGN are driving ionized outflows. Multi-Gaussian
fitting is used to decompose the velocity structure in our galaxies. 14/17 of
our targets require 3 separate kinematic components in the ionized gas in their
central regions. The broadest components of these fits have FWHM = 530 - 2520
km/s, with a mean value of 920 +- 50 km/s. By simultaneously fitting both the
H{\beta}/[O III] and H{\alpha}/[N II] complexes we construct ionization
diagnostic diagrams for each component. 13/17 of our galaxies show a
significant (> 95 %) correlation between the [N II]/H{\alpha} ratio and the
velocity dispersion of the gas. Such a correlation is the natural consequence
of a contribution to the ionization from shock excitation and we argue that
this demonstrates that the outflows from these AGN are directly impacting the
surrounding ISM within the galaxies.Comment: 37 pages, 30 figures. Accepted for publication in MNRA
Star-Formation in the Ultraluminous Infrared Galaxy F00183-7111
We report the detection of molecular CO(1-0) gas in F00183-7111, one of the
most extreme Ultra-Luminous Infrared Galaxies known, with the Australia
Telescope Compact Array. We measure a redshift of 0.3292 for F00183-7111 from
the CO(1-0) line and estimate the mass of the molecular gas in 00183 to be 1
10 M. We find that F00183-7111 is predominately
powered by the AGN and only 14 per cent of the total luminosity is
contributed by star-formation (SFR 220 M yr). We also
present an optical image of F00183-7111, which shows an extension to the East.
We searched for star-formation in this extension using radio continuum
observations but do not detect any. This suggests that the star-formation is
likely to be predominately nuclear. These observations provide additional
support for a model in which the radio emission from ULIRGs is powered by an
intense burst of star-formation and by a radio-loud AGN embedded in its
nucleus, both triggered by a merger of gas-rich galaxies.Comment: 5 pages, 2 figures, Accepted for publication in MNRAS Letters
Accepted 2014 January 19. Received 2013 December 30; in original form 2013
November 2
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