3,161 research outputs found
MHD Wave Propagation in the Neighbourhood of Two Null Points
The nature of fast magnetoacoustic and Alfv\'en waves is investigated in a
zero plasma in the neighbourhood of a pair of two-dimensional null
points. This gives an indication of wave propagation in the low solar
corona, for a more complicated magnetic configuration than that looked at by
McLaughlin & Hood (2004). It is found that the fast wave is attracted to the
null points and that the front of the wave slows down as it approaches the null
point pair, with the wave splitting and part of the wave accumulating at one
null and the rest at the other. Current density will then accumulate at these
points and ohmic dissipation will then extract the energy in the wave at these
points. This suggests locations where wave heating will occur in the corona.
The Alfv\'en wave behaves in a different manner in that the wave accumulates
along the separatrices. Hence, the current density will accumulate at this part
of the topology and this is where wave heating will occur. However, the
phenomenon of wave accumulation at a specific place is a feature of both wave
types, and illustrates the importance of studying the topology of the corona
when considering MHD wave propagation.Comment: 11 pages, 14 figure
Cyclic and constant temperature aging effects on magnetic materials for inverters and converters
Cyclic and constant temperature aging effects on magnetic materials for inverters and converter
Deep radio observations of the radio halo of the bullet cluster 1E 0657-55.8
We present deep 1.1-3.1 GHz Australia Telescope Compact Array observations of
the radio halo of the bullet cluster, 1E 0657-55.8. In comparison to existing
images of this radio halo the detection in our images is at higher
significance. The radio halo is as extended as the X-ray emission in the
direction of cluster merger but is significantly less extended than the X-ray
emission in the perpendicular direction. At low significance we detect a faint
second peak in the radio halo close to the X-ray centroid of the smaller
sub-cluster (the bullet) suggesting that, similarly to the X-ray emission, the
radio halo may consist of two components. Finally, we find that the distinctive
shape of the western edge of the radio halo traces out the X-ray detected bow
shock. The radio halo morphology and the lack of strong point-to-point
correlations between radio, X-ray and weak-lensing properties suggests that the
radio halo is still being formed. The colocation of the X-ray shock with a
distinctive radio brightness edge illustrates that the shock is influencing the
structure of the radio halo. These observations support the theory that shocks
and turbulence influence the formation and evolution of radio halo synchrotron
emission.Comment: 15 pages, 16 figures, 3 tables. Accepted by MNRA
Local versus site-level effects of algae on coral microbial communities
© The Author(s), 2021. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Briggs, A. A., Brown, A. L., & Osenberg, C. W. Local versus site-level effects of algae on coral microbial communities. Royal Society Open Science, 8(9), (2021): 210035, https://doi.org/10.1098/rsos.210035.Microbes influence ecological processes, including the dynamics and health of macro-organisms and their interactions with other species. In coral reefs, microbes mediate negative effects of algae on corals when corals are in contact with algae. However, it is unknown whether these effects extend to larger spatial scales, such as at sites with high algal densities. We investigated how local algal contact and site-level macroalgal cover influenced coral microbial communities in a field study at two islands in French Polynesia, Mo'orea and Mangareva. At 5 sites at each island, we sampled prokaryotic microbial communities (microbiomes) associated with corals, macroalgae, turf algae and water, with coral samples taken from individuals that were isolated from or in contact with turf or macroalgae. Algal contact and macroalgal cover had antagonistic effects on coral microbiome alpha and beta diversity. Additionally, coral microbiomes shifted and became more similar to macroalgal microbiomes at sites with high macroalgal cover and with algal contact, although the microbial taxa that changed varied by island. Our results indicate that coral microbiomes can be affected by algae outside of the coral's immediate vicinity, and local- and site-level effects of algae can obscure each other's effects when both scales are not considered.This research was supported by the University of Georgia, Odum School of Ecology's Small Grants programme and the University of Florida's John J. and Katherine C. Ewel Fellowship
Another shock for the Bullet cluster, and the source of seed electrons for radio relics
With Australia Telescope Compact Array observations, we detect a highly
elongated Mpc-scale diffuse radio source on the eastern periphery of the Bullet
cluster 1E0657-55.8, which we argue has the positional, spectral and
polarimetric characteristics of a radio relic. This powerful relic (2.3+/-0.1 x
10^25 W Hz^-1) consists of a bright northern bulb and a faint linear tail. The
bulb emits 94% of the observed radio flux and has the highest surface
brightness of any known relic. Exactly coincident with the linear tail we find
a sharp X-ray surface brightness edge in the deep Chandra image of the cluster
-- a signature of a shock front in the hot intracluster medium (ICM), located
on the opposite side of the cluster to the famous bow shock. This new example
of an X-ray shock coincident with a relic further supports the hypothesis that
shocks in the outer regions of clusters can form relics via diffusive shock
(re-)acceleration. Intriguingly, our new relic suggests that seed electrons for
reacceleration are coming from a local remnant of a radio galaxy, which we are
lucky to catch before its complete disruption. If this scenario, in which a
relic forms when a shock crosses a well-defined region of the ICM polluted with
aged relativistic plasma -- as opposed to the usual assumption that seeds are
uniformly mixed in the ICM -- is also the case for other relics, this may
explain a number of peculiar properties of peripheral relics.Comment: 10 pages, 9 figures, 1 table, accepted for publication in MNRA
Mitochondrial‐Dna Analyses And The Origin And Relative Age Of Parthenogenetic Lizards (Genus Cnemidophorus). Iii. C. Velox And C. Exsanguis
Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/137554/1/evo02542.pd
Capabilities, institutions and markets : a cross jurisdictional analysis of embedded public values in public works procurement in Australia
Improved Thermal-Vacuum Compatible Flat Plate Radiometric Souce for System-Level Testing of Optical Sensors
This work describes the development of an improved vacuum compatible flat plate radiometric source used for characterizing and calibrating remote optical sensors, in situ, throughout their testing period. The original flat plate radiometric source was developed for use by the VIIRS instrument during the NPOESS Preparatory Project (NPP). Following this effort, the FPI has had significant upgrades in order to improve both the radiometric throughput and uniformity. Results of the VIIRS testing with the reconfigured FPI are reported and discussed
Mitochondrial‐Dna Analyses And The Origin And Relative Age Of Parthenogenetic Lizards (Genus Cnemidophorus). Iv. Nine Sexlineatus‐Group Unisexuals
Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/137512/1/evo02543.pd
Targeted, structured text messaging to improve dietary and lifestyle behaviours for people on maintenance haemodialysis (KIDNEYTEXT): Study protocol for a randomised controlled trial
Introduction Managing nutrition is critical for reducing morbidity and mortality in patients on haemodialysis but adherence to the complex dietary restrictions remains problematic. Innovative interventions to enhance the delivery of nutritional care are needed. The aim of this phase II trial is to evaluate the feasibility and effectiveness of a targeted mobile phone text messaging system to improve dietary and lifestyle behaviours in patients on long-term haemodialysis. Methods and analysis Single-blinded randomised controlled trial with 6 months of follow-up in 130 patients on haemodialysis who will be randomised to either standard care or KIDNEYTEXT. The KIDNEYTEXT intervention group will receive three text messages per week for 6 months. The text messages provide customised dietary information and advice based on renal dietary guidelines and general healthy eating dietary guidelines, and motivation and support to improve behaviours. The primary outcome is feasibility including recruitment rate, drop-out rate, adherence to renal dietary recommendations, participant satisfaction and a process evaluation using semistructured interviews with a subset of purposively sampled participants. Secondary and exploratory outcomes include a range of clinical and behavioural outcomes and a healthcare utilisation cost analysis will be undertaken. Ethics and dissemination The study has been approved by the Western Sydney Local Health District Human Research Ethics Committee-Westmead. Results will be presented at scientific meetings and published in peer-reviewed publications. Trial registration number ACTRN12617001084370; Pre-results
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