cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Dwarf galaxies in the Perseus Cluster: further evidence for a disc origin for dwarf ellipticals
Creators: name: Penny, S. J.
name: Forbes, Duncan
name: Pimbblet, K. A.
name: Floyd, D. J. E.
Publisher: name: Swinburne
Year: 2024
Subjects: classificationCode: 510103
subject: Cosmology and extragalactic astronomy

description: We present the results of aKeck-ESI (Echellette Spectrograph and Imager) spectroscopic study of six dwarf elliptical (dE) galaxies in the Perseus Cluster core, and confirm two dwarfs as cluster members for the first time. All six dEs follow the size-magnitude relation for dE/dSph galaxies. Central velocity dispersions aremeasured for three Perseus dwarfs in our sample, and all lie on the s-luminosity relation for early-type, pressure-supported systems.We furthermore examine SA 0426-002, a unique dE in our sample with a bar-like morphology surrounded by low surface brightness wings/lobes (μB = 27 mag arcsec-2). Given its morphology, velocity dispersion (s0 =33.9±6.1 kms-1), velocity relative to the brightest cluster galaxy NGC 1275 (2711 km s-1), size (Re = 2.1 ± 0.10 kpc), and Śersic index (n = 1.2 ± 0.02), we hypothesize the dwarf has morphologically transformed from a low-mass disc to dE via harassment. The low surface brightness lobes can be explained as a ring feature, with the bar formation triggered by tidal interactions via speed encounters with Perseus Cluster members. Alongside spiral structure found in dEs in Fornax and Virgo, SA 0426-002 provides crucial evidence that a fraction of bright dEs have a disc infall origin, and are not part of the primordial cluster population.
Full spectral fitting of Milky Way and M 31 globular clusters: ages and metallicities
Creators: name: Cezario, E.
name: Coelho, P. R. T.
name: Alves-Brito, A.
name: Forbes, Duncan
name: Brodie, Jean
Publisher: name: Swinburne
Year: 2024
Subjects: classificationCode: 510103
subject: Cosmology and extragalactic astronomy

description: Context .The formation and evolution of disk galaxies are long standing questions in astronomy. Understanding the properties of globular cluster systems can lead to important insights on the evolution of its host galaxy. Aims. We aim to obtain the stellar population parameters - age and metallicity - of a sample of M31 and Galactic globular clusters. Studying their globular cluster systems is an important step towards understanding their formation and evolution in a complete way. Methods. Our analysis employs a modern pixel-to-pixel spectral fitting technique to fit observed integrated spectra to updated stellar population models. By comparing observations to models we obtain the ages and metallicities of their stellar populations. We apply this technique to a sample of 38 globular clusters in M31 and to 41 Galactic globular clusters, used as a control sample. Results. Our sample of M31 globular clusters spans ages from 150 Myr to the age of the Universe. Metallicities [Fe/H] range from -2.2 dex to the solar value. The age-metallicity relation obtained can be described as having two components: an old population with a flat age-[Fe/H] relation, possibly associated with the halo and/or bulge, and a second one with a roughly linear relation between age and metallicity, higher metallicities corresponding to younger ages, possibly associated with the M31 disk. While we recover the very well known Galactic GC metallicity bimodality, our own analysis of M31's metallicity distribution function (MDF) suggests that both GC systems cover basically the same [Fe/H] range yet M31's MDF is not clearly bimodal. These results suggest that both galaxies experienced different star formation and accretion histories.
Polarization of excitation light influences molecule counting in single-molecule localization microscopy
Creators: name: Chen, Ye
name: Lin, Han
name: Ludford-Menting, Mandy J.
name: Clayton, Andrew
name: Gu, Min
name: Russell, Sarah
Publisher: name: Swinburne
Year: 2024
Subjects: classificationCode: 310102
subject: Cell development, proliferation and death
classificationCode: 510302
subject: Classical and physical optics

description: Single-molecule localization microscopy has been widely applied to count the number of biological molecules within a certain structure. The percentage of molecules that are detected significantly affects the interpretation of data. Among many factors that affect this percentage, the polarization state of the excitation light is often neglected or at least unstated in publications. We demonstrate by simulation and experiment that the number of molecules detected can be different from -40 up to 100 % when using circularly or linearly polarized excitation light. This is determined mainly by the number of photons emitted by single fluorescent molecule, namely the choice of fluorescence proteins, and the background noise in the system, namely the illumination scheme. This difference can be further exaggerated or mitigated by various fixation methods, magnification, and camera settings We conclude that the final choice between circularly or linearly polarized excitation light should be made experimentally, based on the signal to noise ratio of the system.
The "Museo Giovanni Capellini": a case study on how to drive a Nineteenth Century geological collection to modern times.
Creators: name: Contessi, Michela
name: Barbieri, Roberto
Publisher: name: Zenodo
Year: 2022

description: Abstract of conference poster on The "Museo Giovanni Capellini": a case study on how to drive a Nineteenth Century geological collection to modern times. by Museum Curator Michela Contessi of University Of Bologna Ravenna Italy for SPNHC2022 Conference, Edinburgh. June 5-10th 2022.
New perspective on galaxy outflows from the first detection of both intrinsic and traverse metal-line absorption
Creators: name: Kacprzak, Glenn
name: Martin, Crystal L.
name: Bouché, Nicolas
name: Churchill, Christopher W.
name: Cooke, Jeff
name: LeReun, Audrey
name: Schroetter, Ilane
name: Ho, Stephanie H.
name: Klimek, Elizabeth
Publisher: name: Swinburne
Year: 2024
Subjects: classificationCode: 510103
subject: Cosmology and extragalactic astronomy

description: We present the first observation of a galaxy (z = 0.2) that exhibits metal-line absorption back-illuminated by the galaxy (down-the-barrel) and transversely by a background quasar at a projected distance of 58 kpc. Both absorption systems, traced by Mg II, are blueshifted relative to the galaxy systemic velocity. The quasar sight line, which resides almost directly along the projected minor axis of the galaxy, probes Mg I and Mg II absorption obtained from the Keck/Low Resolution Imaging Spectrometer as well as Lyα, Si II, and Si III absorption obtained from the Hubble Space Telescope/Cosmic Origins Spectrograph. For the first time, we combine two independent models used to quantify the outflow properties for down-the-barrel and transverse absorption. We find that the modeled down-the-barrel deprojected outflow velocities range between V dtb = 45-255 km s-1. The transverse bi-conical outflow model, assuming constant-velocity flows perpendicular to the disk, requires wind velocities V outflow = 40-80 km s-1 to reproduce the transverse Mg II absorption kinematics, which is consistent with the range of V dtb. The galaxy has a metallicity, derived from Hα and N II, of [O/H] = -0.21 ± 0.08, whereas the transverse absorption has [X/H] = -1.12 ± 0.02. The galaxy star formation rate is constrained between 4.6-15 M yr-1 while the estimated outflow rate ranges between 1.6-4.2 M yr-1 and yields a wind loading factor ranging between 0.1-0.9. The galaxy and gas metallicities, the galaxy-quasar sight-line geometry, and the down-the-barrel and transverse modeled outflow velocities collectively suggest that the transverse gas originates from ongoing outflowing material from the galaxy. The 1 dex decrease in metallicity from the base of the outflow to the outer halo suggests metal dilution of the gas by the time it reached 58 kpc.
Extended star clusters in NGC 1023 from HST/ACS mosaic imaging
Creators: name: Forbes, Duncan
name: Almeida, A.
name: Spitler, L. R.
name: Pota, V.
Publisher: name: Swinburne
Year: 2024
Subjects: classificationCode: 510103
subject: Cosmology and extragalactic astronomy

description: Faint fuzzies (FFs) are a relatively new class of star cluster, first found in the nearby S0 galaxy NGC 1023 by Larsen & Brodie using Wide Field Planetary Camera 2 (WFPC2) images from the Hubble Space Telescope (HST). Here, we investigate the star cluster system of NGC 1023 using an eight pointing mosaic of Advanced Camera for Surveys (ACS) images from HST. We identify blue and red normal globular clusters (two of which are particularly luminous and dense) and two ultracompact dwarf objects (with effective radius ∼ 10 pc).With our more complete spatial coverage, we also find 81 red and 27 blue FFs. We confirm the association of the red FFs with the disc of NGC 1023, consistent with them being long-lived open clusters. Half of the blue FFs appear to be associated with the dwarf satellite galaxy NGC 1023A (which was largely absent from the original HST/WFPC2 coverage), while the remainder are spatially coincident with the densest H I gas that surrounds NGC 1023. The blue FFs have colours that are consistent with young (few 100 Myr old) star clusters that formed during the most recent interaction between NGC 1023 and its satellite NGC 1023A.
Timing, polarimetry and physics of the bright, nearby millisecond pulsar PSR J0437-4715 - a single-pulse perspective
Creators: name: Oslowski, Stefan
name: van Straten, Willem
name: Bailes, Matthew
name: Jameson, A.
name: Hobbs, G.
Publisher: name: Swinburne
Year: 2024

description: Single pulses from radio pulsars contain a wealth of information about emission and propagation in the magnetosphere and insight into their timing properties. It was recently demonstrated that single-pulse emission is responsible for limiting the timing stability of the brightest of millisecond pulsars. We report on an analysis of more than a million single pulses from PSR J0437-4715 and present various statistical properties such as the signal-to-noise ratio (S/N) distribution, timing and polarimetry of average profiles integrated from sub-pulses with chosen S/N cut-offs, modulation properties of the emission, phase-resolved statistics of the S/N and two-dimensional spherical histograms of the polarization vector orientation. The last of these indicates the presence of orthogonally polarized modes (OPMs). Combined with the dependence of the polarization fraction on the S/N and polarimetry of the brightest pulses, the existence of OPMs constrains pulsar emission mechanisms and models for the plasma physics in the magnetosphere.
Large-scale environment of z ̃ 5.7 C IV absorption systems - I. Projected distribution of galaxies
Creators: name: Gonzalo Díaz, C.
name: Koyama, Yusei
name: Ryan-Weber, Emma
name: Cooke, Jeff
name: Ouchi, Masami
name: Shimasaku, Kazuhiro
name: Nakata, Fumiaki
Publisher: name: Swinburne
Year: 2024
Subjects: classificationCode: 510103
subject: Cosmology and extragalactic astronomy

description: Metal absorption systems are products of star formation. They are believed to be associated with massive star-forming galaxies, which have significantly enriched their surroundings. To test this idea with high column density C iv absorption systems at z similar to 5.7, we study the projected distribution of galaxies and characterize the environment of C iv systems in two independent quasar lines of sight: J103027.01+052455.0 and J113717.73+354956.9. Using wide-field photometry (similar to 80 x 60 h(-1) comoving Mpc), we select bright (M-UV(1350 angstrom) a parts per thousand(2) -21.0 mag.) Lyman break galaxies (LBGs) at z similar to 5.7 in a redshift slice Delta z similar to 0.2 and we compare their projected distribution with z similar to 5.7 narrow-band selected Lyman alpha emitters (LAEs, Delta z similar to 0.08). We find that the C iv systems are located more than 10 h(-1) projected comoving Mpc from the main concentrations of LBGs and no candidate is closer than similar to 5 h(-1) projected comoving Mpc. In contrast, an excess of LAEs - lower mass galaxies - is found on scales of similar to 10 h(-1) comoving Mpc, suggesting that LAEs are the primary candidates for the source of the C iv systems. Furthermore, the closest object to the system in the field J1030+0524 is a faint LAE at a projected distance of 212 h(-1) physical kpc. However, this work cannot rule out undiscovered lower mass galaxies as the origin of these absorption systems. We conclude that, in contrast with lower redshift examples (z a parts per thousand(2) 3.5), strong C iv absorption systems at z similar to 5.7 trace low-to-intermediate density environments dominated by low-mass galaxies. Moreover, the excess of LAEs associated with high levels of ionizing flux agrees with the idea that faint galaxies dominate the ionizing photon budget at this redshift.
The SLUGGS survey: exploring the metallicity gradients of nearby early-type galaxies to large radii
Creators: name: Pastorello, N.
name: Forbes, Duncan
name: Foster, C.
name: Brodie, Jean
name: Usher, C.
name: Romanowsky, A. J.
name: Strader, J.
name: Arnold, J. A.
Publisher: name: Swinburne
Year: 2024
Subjects: classificationCode: 510103
subject: Cosmology and extragalactic astronomy

description: Stellar metallicity gradients in the outer regions of galaxies are a critical tool for disentangling the contributions of in situ and ex situ formed stars. In the two-phase galaxy formation scenario, the initial gas collapse creates steep metallicity gradients, while the accretion of stars formed in satellites tends to flatten these gradients in the outskirts, particularly for massive galaxies. This work presents the first compilation of extended metallicity profiles over a wide range of galaxy mass. We use the DEep Imaging Multi-Object Spectrograph spectrograph on the Keck telescope in multislit mode to obtain radial stellar metallicity profiles for 22 nearby early-type galaxies. From the calcium triplet lines in the near-infrared, we measure the metallicity of the starlight up to 3 effective radii. We find a relation between the outer metallicity gradient and galaxy mass, in the sense that lower mass systems show steeper metallicity gradients than more massive galaxies. This result is consistent with a picture in which the ratio of ex situ to in situ formed stars is lower in less massive galaxies as a consequence of the smaller contribution by accretion. In addition, we infer a correlation between the strength of the calcium triplet feature in the near-infrared and the stellar initial mass function slope that is consistent with recent models in the literature.
Grain growth signatures in the protoplanetary discs of chamaeleon and lupus
Creators: name: Ubach, C.
name: Maddison, Sarah
name: Wright, C. M.
name: Wilner, D. J.
name: Lommen, D. J. P.
name: Koribalski, B.
Publisher: name: Swinburne
Year: 2024

description: We present Australia Telescope Compact Array results of a 3 and 7 mm continuum survey of 20 T Tauri stars in the Chamaeleon and Lupus star-forming regions. This survey aims to identify protoplanetary discs with signs of grain growth. We detected 90 per cent of the sources at 3 and 7 mm, and determined the spectral slopes, dust opacity indices and dust disc masses. We also present temporal monitoring results of a small subset of sources at 7, 15 mm and 3+6 cm to investigate grain growth to centimetre (cm) sizes and constrain emission mechanisms in these sources. Additionally, we investigated the potential correlation between grain growth signatures in the infrared (10 μm silicate feature) and millimetre (1–3 mm spectral slope, α). Eleven sources at 3 and 7 mm have dominant thermal dust emission up to 7 mm, with seven of these having a 1–3 mm dust opacity index less than unity, suggesting grain growth up to at least mm sizes. The Chamaeleon sources observed at 15 mm and beyond show the presence of excess emission from an ionized wind and/or chromospheric emission. Long-time-scale monitoring at 7 mm indicated that cm-sized pebbles are present in at least four sources. Short-time-scale monitoring at 15 mm suggests that the excess emission is from thermal free–free emission. Finally, a weak correlation was found between the strength of the 10 μm feature and α, suggesting simultaneous dust evolution of the inner and outer parts of the disc. This survey shows that grain growth up to cm-sized pebbles and the presence of excess emission at 15 mm and beyond are common in these systems, and that temporal monitoring is required to disentangle these emission mechanisms.
Where do galaxies end? Comparing measurement techniques of hydrodynamic-simulation galaxies' integrated properties
Creators: name: Stevens, A. R. H.
name: Martig, M.
name: Croton, Darren
name: Feng, Y.
Publisher: name: Swinburne
Year: 2024

description: Using the suite of high-resolution zoom re-simulations of individual haloes by Martig et al., and the large-scale simulation MassiveBlack-II, we examine the differences in measured galaxy properties from techniques with various aperture definitions of where galaxies end.We perform techniques popular in the literature and present a new technique of our own, where the aperture radius is based on the baryonic mass profiles of simulated (sub)haloes. For the average Milky Way-mass system, we find the two most popular techniques in the literature return differences of the order of 30 per cent for stellar mass, a factor of 3 for gas mass, 40 per cent for star formation rate, and factors of several for gas accretion and ejection rates. Individual cases can show variations greater than this, with the severity dependent on the concentration of a given system. The average difference in integrated properties for a more general galaxy population is not as striking, but is still significant for stellar and gas mass, especially for optical-limit apertures. The large differences that can occur are problematic for comparing results from various publications. We stress the importance of both defining and justifying a technique choice and discourage using popular apertures that use an exact fraction of the virial radius, due to the unignorable variation in galaxy-to-(sub)halo size. Finally, we note that technique choice does not greatly affect simulated galaxies from lying within the scatter of observed scaling relations, but it can alter the derived best-fitting slope for the Kennicutt-Schmidt relation.
New HI scaling relations to probe the HI content of galaxies via global HI-deficiency maps
Creators: name: Dénes, H.
name: Kilborn, Virginia
name: Koribalski, B. S.
Publisher: name: Swinburne
Year: 2024
Subjects: classificationCode: 510103
subject: Cosmology and extragalactic astronomy

description: We present new multiwavelength scaling relations between the neutral hydrogen content (H I) and the stellar properties of nearby galaxies selected from the HI Parkes All-Sky Survey (HIPASS). We use these new scaling relations to investigate the environmental dependence of the HI content of galaxies. We find that galaxies in high-density environments tend to have on average less HI than galaxies with the same stellar mass in low-density environments. Our new HI scaling relations allow us to identify individual galaxies, as well as group/cluster environments, that have an 'anomalous' HI content. We map the global distribution of HI-deficient and HI-excess galaxies on the sky and compare it to the large-scale structure of galaxies. We find galaxy clusters to be HI deficient, and we identify that the regions surrounding clusters tend to beHI excess. Finally, we demonstrate the potential of using HI scaling relations to predict future HI surveys based on an optical redshift survey. We apply our scaling relations to 16 709 galaxies in the 6dF Galaxy Survey that lie in the HIPASS volume and compare our predictions to the measurements. We find that scaling relations are a good method to estimate the outcome of HI surveys.
Heat and Freshwater Transport by Mesoscale Eddies in the Southern Subpolar North Atlantic
Creators: Muller, Vasco
Kieke, Dagmar
Myers, Paul G.
Pennelly, Clark
Steinfeldt, Reiner
Stendardo, Ilaria
Publisher: name: University of Alberta Library
Year: 2019

A new data set of temperature and salinity fields reconstructed from satellite altimetry data between January 1993 and April 2014 is combined with satellite observations of mesoscale eddies in the subpolar North Atlantic between 40°N–55°N and 43°W–20.5°W. The data set is used to calculate the meridional heat and freshwater transports related to the propagation of eddies crossing 47°N, a latitude close to the boundary between the subpolar and the subtropical gyres. The largest heat and freshwater transports by eddies are observed in the western part of the Newfoundland Basin. Around 35–45% of the heat and

freshwater transports by eddies across 47°N stem from individual isolated eddies with large thermohaline signatures. Northward moving cold and fresh cyclonic eddies carrying subpolar water from the Western Boundary Current make a considerable contribution to the overall heat and freshwater transport by eddies crossing 47°N. While the transport by individual eddies is negligible compared to the transport by the mean flow in this region, it can have a notable influence on the temporal variability. The analysis is repeated for a model simulation with 1/12° horizontal resolution for the period 2002–2013. The observed results are well reproduced in the model simulation; in particular, the modeled number of eddies crossing 47°N, the spatial distribution, and the associated heat and freshwater transports across this latitude are consistent with

the observations.
A Markov Model of Server to Client IP Traffic in First Person Shooter Games
Creators: name: Branch, Philip
name: Cricenti, Tony
name: Armitage, Grenville
Publisher: name: Swinburne
Year: 2024

description: Modeling traffic generated by Internet based multiplayer computer games has attracted a great deal of attention in the past few years. In part this has been driven by a need to simulate the network impact of highly interactive online games such as the first person shooter (FPS). Packet size distributions and autocorrelation models are important elements in the creation of realistic traffic generators for network simulators. In this paper we present a simple technique for constructing Markov chains that model autocorrelated packet length for N-player FPS games based on traffic traces of of 2-player games. This enables us to synthesize the time sequence of the length of server to client traffic as well as its probability distribution. We illustrate the likely generality of our approach using data from seven FPS games that have been popular over the past nine years: Half-Life, Half-Life Counterstrike, Half-Life 2, Half-Life 2 Counterstrike, Quake III Arena, Quake 4 and Wolfenstein Enemy Territory.
Nanoparticle-enhanced infrared neural stimulation
Creators: name: Paviolo, Chiara
name: Thompson, Alexander C
name: Yong, Jiawey
name: Brown, William G A
name: Stoddart, Paul
Publisher: name: Swinburne
Year: 2024

description: Objective. Recent research has demonstrated that nerves can be stimulated by transient heating associated with the absorption of infrared light by water in the tissue. There is a great deal of interest in using this technique in neural prostheses, due to the potential for increased localization of the stimulus and minimization of contact with the tissue. However, thermal modelling suggests that the full benefits of increased localization may be reduced by cumulative heating effects when multiple stimulus sites and/or high repetition rates are used. Approach. Here we review recent in vitro and in vivo results suggesting that the transient heating associated with plasmon absorption in gold nanorods can also be used to stimulate nerves. Main results. Patch clamp experiments on cultured spiral ganglion neurons exhibited action potentials when exposed to 780 nm light at the plasmon absorption peak, while the amplitude of compound action potentials in the rat sciatic nerve were increased by laser irradiation of gold nanorods in the vicinity of the plasma membrane. Similarly, calcium imaging studies of NG108-15 neuronal cells incubated with Au nanorods revealed an increased level of intracellular calcium activity synchronized with laser exposure. Significance. Given that the plasmon absorption peak of gold nanorods can be matched with the transparency window of biological tissues, these results demonstrate that nanorod absorbers hold great promise to enhance the process of infrared neural stimulation for future applications in neural prostheses and fundamental studies in neuroscience.
Seasonal Cycle of the Coastal West Greenland Current System between Cape Farewell and Cape Desolation from a very high-resolution numerical model.
Creators: Gou, Ruijian
Feucher, CHarlene
Pennelly, Clark
Myers, Paul G.
Publisher: name: University of Alberta Library
Year: 2021

The shelf based West Greenland Current System carries both Arctic Water and Greenland meltwater around Cape Farewell, the southern tip of Greenland, where it may impact the deep water formation in the Labrador Sea. Nevertheless, this current system remains largely unknown due to limited observations. Using a very high-resolution (1°/60°) numerical simulation integrated from 2005 to 2014, the annual cycle of the current structure in the vicinity of southern Greenland is analyzed to present the seasonal variability of the West Greenland Current System. A distinct shelf break West Greenland Coastal

Current (WGCC) exists for about half the year between Cape Farewell and Cape Desolation, although it merges with the main jet of the West Greenland Current (WGC) in winter and separates in summer. The WGC has three components at Juliannehaab Bight: A shelf component, a shelf-break component and a main slope jet. The shelf system is most energetic in fall, when the freshwater transport is also the greatest in a range of 25–40 mSv, with a broad transport minimum in spring in a range of 15–25 mSv. The seasonal cycle is strongest near Cape Farewell and weakest at Cape Desolation. The strength of the shelf

system decreases as one moves north as water is lost offshore, with strongest transports of 0.61 Sv to the east of Cape Farewell and weakest of 0.41 Sv at Cape Desolation. This decrease in transport between Cape Farewell and Cape Desolation suggests substantial exchange between WGCC and WGC in this region.
Evaluating Irredundant Maximal Contained Rewritings for XPath Queries on Views
Creators: name: Zhou, Rui
name: Liu, Chengfei
name: Li, Jianxin
name: Wang, J.
name: Yu, J. X.
Publisher: name: Swinburne
Year: 2024
Subjects: classificationCode: 460999
subject: Information systems not elsewhere classified

description: We review the problem of finding contained rewritings (CRs) for XPath queries using XPath views. CR is proposed to cater for data integration scenarios, where views are unlikely to be complete due to the limited coverage of data sources, and hence equivalent rewritings are impossible to be found. As a result, we are usually required to find a maximal contained rewriting (MCR) for a query to provide the best possible answers. An MCR is a set of CRs, and may contain redundant CRs. Obviously, evaluating redundant CRs on materialized views is unnecessary. In this paper, we first address how to find the irredundant maximal contained rewriting (IMCR), i.e. all the irredundant CRs. We show that the existing approach ignores a type of situation, and turns out to be not sufficient. As a result, the only safe solution is a brute-force pairwise containment check for all the CRs. We then propose some heuristics to speed up the brute-force comparisons. When a materialized view is given, we propose how to evaluate the IMCR on the materialized view, which, to our knowledge, is the first work on optimizing the evaluation of a set of produced CRs on the materialized view by considering the inherent structural characteristics of the CRs. Our experiments show the effectiveness and efficiency of our algorithms.
New spin squeezing and other entanglement tests for two mode systems of identical bosons
Creators: name: Dalton, Bryan
name: Heaney, L
name: Goold, J
name: Garraway, B M
name: Busch, Th
Publisher: name: Swinburne
Year: 2024
Subjects: classificationCode: 400912
subject: Quantum engineering systems (incl. computing and communications)
classificationCode: 490203
subject: Mathematical aspects of classical mechanics, quantum mechanics and quantum information theory
classificationCode: 510801
subject: Degenerate quantum gases and atom optics
classificationCode: 510803
subject: Quantum information, computation and communication

description: For any quantum state representing a physical system of identical particles, the density operator must satisfy the symmetrization principle (SP) and conform to super-selection rules (SSR) that prohibit coherences between differing total particle numbers. Here we consider bi-partitite states for massive bosons, where both the system and sub-systems are modes (or sets of modes) and particle numbers for quantum states are determined from the mode occupancies. Defining non-entangled or separable states as those prepared via local operations (on the sub-systems) and classical communication processes, the sub-system density operators are also required to satisfy the SP and conform to the SSR, in contrast to some other approaches. Whilst in the presence of this additional constraint the previously obtained sufficiency criteria for entanglement, such as the sum of the ˆSx and ˆSy variances for the Schwinger spin components being less than half the mean boson number, and the strong correlation test of |haˆm (bˆ†)ni|2 being greater than h(aˆ†)maˆm (bˆ†)nbˆni(m, n = 1, 2, . . .) are still valid, new tests are obtained in our work. We show that the presence of spin squeezing in at least one of the spin components ˆSx , ˆSy and ˆSz is a sufficient criterion for the presence of entanglement and a simple correlation test can be constructed of |haˆm (bˆ†)ni|2 merely being greater than zero.We show that for the case of relative phase eigenstates, the new spin squeezing test for entanglement is satisfied (for the principle spin operators), whilst the test involving the sum of the ˆSx and ˆSy variances is not. However, another spin squeezing entanglement test for Bose-Einstein condensates involving the variance in ˆSz being less than the sum of the squared mean values for ˆSx and ˆSy divided by the boson number was based on a concept of entanglement inconsistent with the SP, and here we present a revised treatment which again leads to spin squeezing as an entanglement test.
Sensitivity of Labrador Sea Water Formation to Changes in Model Resolution, Atmospheric Forcing, and Freshwater Input.
Creators: Garcia-Quintana, Yarisbel
Courtois, Peggy
Hu, Xianmin
Pennelly, Clark
Kieke, Dagmar
Myers, Paul G.
Publisher: name: University of Alberta Library
Year: 2019

Labrador Sea Water (LSW) is one of the main contributors to the lower limb of the Atlantic Meridional Overturning Circulation. In this study, we explore the sensitivity of LSW formation to model resolution, Greenland melt, absence of high-frequency atmospheric phenomena, and changes in precipitation. We use five numerical model simulations at both (1/4)◦ and (1/12)◦ resolutions. A kinematic subduction approach is used to obtain the LSW formation rate over the period 2004 to 2016. The control simulation, with (1/4)◦ resolution, showed a mean annual production rate of 1.9 Sv (1 Sv = 106 m3/s) in the

density range of 27.68–27.80 kg/m3 for the period 2004–2016. Deep convection events that occurred during 2008, 2012, and 2014–2016 were captured. We found that with (1/4)◦ resolution the LSW formation rate is 19% larger compared with its counterpart at (1/12)◦ resolution. The presence of Greenland melt and an increase in the precipitation impact the denser LSW layer replenishment but do not decrease the overall LSW formation rate nor the maximum convection depth. A dramatic response was found when filtering the atmospheric forcing, which induced a decrease of 44% in heat loss over the Labrador Sea, strong enough to halt the deep convection and decrease the LSW formation rate by 89%. Even if our experiment was extreme, a decrease in the storms crossing the Labrador Sea with a consequent reduction in the winter heat loss might be a bigger threat to deep convection and LSW formation in the future than the expected increases in the freshwater input.
The Effects of Non-Tariff Measures on Agro-Food Trade: Heterogeneity of Seven Measures and their Effects on Agro-Food Sectors
Creators: name: Inoue, Yutaro
name: Saito, Katsuhiro
name: Kawasaki, Kentaro
Publisher: name: Unknown
Year: 2024
Subjects: subject: International Relations/Trade
subject: Non-Tariff Measures
subject: Global Agro-Food Trade
subject: Structural Gravity Model

description: This study examines the effects of Non-Tariff Measures (NTMs) on global agro-food trade by analyzing seven different NTMs and their interactions. We estimated structural gravity models with the Poisson Pseudo Maximum Likelihood estimator. The results indicate that NTMs generally restrict agro-food trade, reducing it by approximately 28.6% compared to a no-NTM scenario. Two NTMs show larger negative trade effects than SPS and TBT, the commonest measures in agro-food trade. Additionally, the negative impacts of NTMs vary by sector; animal-based product trade may be restricted due to food safety concerns, whereas plant-based product trade seems to be reduced by protectionist measures. On the contrary, NTMs may have positive effects in some sectors by correcting market failures, reducing transaction costs, and aligning with the importing countries’ economic or industrial strategies. Policymakers should balance the benefits of NTMs against the potential loss of food access and ensure inter- ministerial coordination when setting NTMs.
A Review on Li-S Batteries as a High Efficiency Rechargeable Lithium Battery
Creators: name: Barghamadi, M.
name: Kapoor, Ajay
name: Wen, Cuie
Publisher: name: Swinburne
Year: 2024

description: Energy production and storage are critical research domains where the demands for improved energy devices and the requirement for greener energy resources are increasing. There is particularly intense interest in Lithium (Li)-ion batteries for all kinds of electrochemical energy storage. Li-ion batteries are currently the primary energy storage devices in the communications, transportation and renewable-energy sectors. However, scaling up the Li-ion battery technology to meet current increasing demands is still problematic and issues such as safety, costs, and electrode materials with higher performance are under intense investigation. The Li-sulfur (S) battery is a promising electrochemical system as a high-energy secondary battery, particularly for large-scale applications, due to its low cost, theoretically large specific capacity, theoretically high specific energy, and its ecofriendly footprint. The Li-S battery exhibits excellent potential and has attracted the attention of battery developers in large scale production in recent years. This review aims to highlight recent advances in the Li-S battery, providing an overview of the Li-ion battery applications in energy storage, then detailing the challenges facing Li-S battery and current applied strategies for improvement in its efficiency.
Dynamic behaviour of high strength steel parts developed through laser assisted direct metal deposition
Creators: name: Riza, Syed
name: Masood, Syed
name: Wen, Cuie
name: Ruan, Dong
name: Xu, Shanqing
Publisher: name: Swinburne
Year: 2024
Subjects: classificationCode: 400510
subject: Structural engineering
classificationCode: 401706
subject: Numerical modelling and mechanical characterisation
classificationCode: 401707
subject: Solid mechanics

description: High strength steel alloys are good candidates for many engineering applications particularly those involving high strains and impact loads. Such applications in energy absorption devices require materials that can sustain dynamic loading and remain strong under demanding conditions. But the processing cost of these alloys has been a prohibitive factor, thus re-enforcing the research on porous and cellular structures made of stainless steels. Direct metal deposition (DMD) is a process which employs the power of a CO2 laser to melt and deposit metallic powders onto steel substrates. Such structures offer advantages of creating novel configurations only by computer control of laser “tool path”. This research investigates the mechanical behaviour of solid and porous parts with prismatic cavities under quasi-static and dynamic compressive loading. Apart from two main deficiencies of relatively large variations of properties among the test specimen and sufficiently low modulus of elasticity, the stress strain behaviour is very close to the commercial grades of stainless steel produced by rolling and forming. The energy absorption behaviour of porous specimen is also very encouraging and renders DMD as a suitable process for manufacturing of customized sandwich and graded structures that can be used as a substitution for many engineering applications such as monolithic compression plates and explosion shields.
Lasioglossum (Dialictus) pruinosum
Creators: name: Gibbs, Jason
name: Ascher, John S.
name: Rightmyer, Molly G.
name: Isaacs, Rufus
Publisher: name: Zenodo
Year: 2017
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Halictidae
Lasioglossum
Lasioglossum pruinosum

description: Lasioglossum (Dialictus) pruinosum (Robertson 1892) (pilosum group)
County records: Cass, Clinton, Ingham, Leelanau, Tuscola.
Notes. Nest described by Melander & Brues (1903).
description: Published as part of Gibbs, Jason, Ascher, John S., Rightmyer, Molly G. & Isaacs, Rufus, 2017, The bees of Michigan (Hymenoptera: Apoidea: Anthophila), with notes on distribution, taxonomy, pollination, and natural history, pp. 1-160 in Zootaxa 4352 (1) on page 85, DOI: 10.11646/zootaxa.4352.1.1, http://zenodo.org/record/1063854
Variability of the Pacific Derived Arctic Water Over the Southeastern Wandel Sea Shelf (Northeast Greenland) in 2015–2016
Creators: Dmitrenko, Igor A.
Kirillov, Sergei A.
Rudels, Bert
Babb, David G.
Myers, Paul G.
Stedmon, Colin A.
Bendtsen, Jorgen
Ehn, Jens K.
Pedersen, Leif Toudal
Rysgaard, Soren
Barber, David G.
Publisher: name: University of Alberta Library
Year: 2019

A portion of the freshwater transport through Fram Strait consists of low-salinity Pacific-derived Arctic water flowing southward along the east coast of Greenland. The pathways of this water are currently unclear. An Ice Tethered Profiler deployed over the southeastern Wandel Sea shelf (northeast Greenland) in May 2015 collected a profile every 3 hr for a year recording conductivity-temperature-depth (CTD) and Colored Dissolved Organic Matter (CDOM) fluorescence. This was accompanied by velocity observations. The CTD data revealed that the subsurface water (~15–85 m depth) characterized by high CDOM resembles the “cold Halostad” in the Canada Basin formed by the injection of Pacific water. A coastal branch of the Pacific water outflow from the Arctic Ocean supplies the Wandel Sea halostad, which shows a clear seasonal pattern. From July to October–November, the halostad is shallow, more saline, warmer, and with less CDOM. Conversely, from November to April, the halostad deepens, cools, freshens and CDOM increases, likely indicating a higher fraction of Pacific winter water. The CTD surveys, wind and current data, and numerical simulations show that the seasonal variation of wind over the continental slope likely controls seasonal changes of this intermediate water layer. Over northeast Greenland, winter winds have a northerly component from November to April, favoring Ekman transport of the Pacific-derived water to the Wandel Sea shelf. In contrast, the prevailing southerly summer winds result in retreat of the Pacific-derived water off the shelf. The landfast ice off-slope extension modifies wind-forcing disrupting seasonal patterns.
Reconstructing generalized parton distributions from the lattice off-forward Compton amplitude
Creators: name: Hannaford-Gunn, A.
name: Can, K. U.
name: Crawford, J. A.
name: Horsley, R.
name: Rakow, P. E. L.
name: Schierholz, G.
name: Stüben, H.
name: Young, R. D.
name: Zanotti, J. M.
name: CSSM/QCDSF/UKQCD Collaboration
Publisher: name: Deutsches Elektronen-Synchrotron, DESY, Hamburg
Year: 2024
Subjects: subject: 530
subject: parton: distribution function
subject: pi: mass
subject: generalized parton distribution
subject: GeV
subject: structure function
subject: lattice
subject: scattering amplitude
subject: Compton scattering
subject: twist
subject: lattice field theory
subject: momentum transfer

description: We present a determination of the structure functions of the off-forward Compton amplitude H1 and E1 from the Feynman-Hellmann method in lattice QCD. At leading twist, these structure functions give access to the generalized parton distributions (GPDs) H and E, respectively. This calculation is performed for an unphysical pion mass of mπ=412 MeV and four values of the soft momentum transfer, t≈0,-0.3,-0.6,-1.1 GeV2, all at a hard momentum scale of Q¯2≈5 GeV2. Using these results, we test various methods to determine properties of the real-time scattering amplitudes and GPDs: (1) we fit their Mellin moments, and (2) we use a simple GPD ansatz to reconstruct the entire distribution. Our final results show promising agreement with phenomenology and other lattice results and highlight specific systematics in need of control.
FlexIQ: A flexible interactive Querying Framework by Exploiting the Skyline Operator
Creators: name: Islam, Md.Saiful
name: Liu, Chengfei
name: Zhou, Rui
Publisher: name: Swinburne
Year: 2024
Subjects: classificationCode: 461305
subject: Data structures and algorithms

description: Skyline operator has gained much attention in the last decade and is proved to be valuable for multi-criteria decision making. This paper presents a novel Flexible Interactive Querying ( FlexIQ) framework for user feedback-based Select-Project-Join (SPJ) query refinement in databases. In FlexIQ, the user feedback is used to discover the query intent. In addition, we have used the skyline operator to confine the search space of the proposed query refinement algorithms. The user feedback consists of both unexpected information currently present in the query output and expected information that is missing from the query output. Once the feedback is given by the user, our framework refines the initial query by exploiting the skyline operator to minimize the unexpected information as well as maximize the expected information in the refined query output. In our framework, the user can also control different quality metric such as quality of results (e.g., false positive rates, false negative rates and accuracy) and complexity (i.e., quantified as the number of subqueries) in the refined query. We have validated our framework both theoretically and experimentally. In particular, we have demonstrated the effectiveness of our proposed framework by comparing its performance with the naive decision tree based query refinement.
Scalable quantum simulation of pulsed entanglement and Einstein-Podolsky-Rosen steering in optomechanics
Creators: name: Kiesewetter, S.
name: He, Q. Y.
name: Drummond, Peter
name: Reid, Margaret
Publisher: name: Swinburne
Year: 2024

description: We demonstrate a complete, probabilistic quantum dynamical simulation of the standard nonlinear Hamiltonian of optomechanics, including decoherence at finite temperatures. Robust entanglement of a photonic pulse with a mechanical oscillator is predicted. Our exact quantum simulations use the positive-P technique, are scalable to large Hilbert spaces, and give excellent agreement with recent experiments. We predict the required conditions for the next stage in this research. Strong quantum steering between the photonic and mechanical systems is possible, depending on thermal occupation. This is more viable in optical than in electromechanical experiments.
Drift Performance of Point Fixed Glass Façade Systems
Creators: name: Sivanerupan, S.
name: Wilson, John
name: Gad, Emad
name: Lam, N.
Publisher: name: Swinburne
Year: 2024

description: Glass façade systems in buildings are subject to racking actions caused by inter storey drifts from earthquakes and wind action. The performance of façade systems is dependent on the amount of imposed drift and the interaction of the glass panels with the façade structural support frames. There are two major concerns related to the glass façade system performance during and immediately after a seismic event; hazards to people from falling glass and the cost associated with building down time and repair. It was observed that earthquake damage to glass façade systems resulting from in-plane racking actions is increasingly common and yet there has been limited research published in this field. The research completed to date has mainly focused on traditional framed glass façade systems; however, the racking performance of point fixed glass façade system (PFGFS) is likely to be quite different. Therefore, the aim of the research presented in this paper is to assess the in-plane racking performance of PFGFS which is a façade system gaining popularity worldwide.Two unique full scale in-plane racking laboratory tests on typical PFGFS with different types of connections were conducted and specific racking mechanisms were identified. Sophisticated non-linear finite element models (FE models) were developed and benchmarked against experimental results with excellent correlation. Further detailed FE analyses were conducted to evaluate the individual drift contributions of each racking mechanism such as rigid body translation of the glass panels at the oversize holes for construction tolerance, spider arm rotation and spider arm deformation. It was found that most of the drift capacity is attributed to the rigid body translation at the oversize holes. In this paper, the laboratory test setup and the experimental results are discussed together with the confirmatory FE analysis results to assess the in-plane racking performance of the PFGFS.
Hudson Strait Inflow: Structure and Variability
Creators: Ridenour, Natasha A.
Straneo, Fiammetta
Holte, James
Gratton, Yves
Myers, Paul G.
Barber, David G.
Publisher: name: University of Alberta Library
Year: 2021

Hudson Strait is the main pathway of heat, mass, and freshwater exchange between Hudson Bay and the Arctic and North Atlantic oceans. The outflow along the southern coast of the strait, a fresh, baroclinic jet directed toward the North Atlantic, has received more attention due to its potential impact on deep convection in the Labrador Sea. However, details about the westward, more barotropic inflow along the northern coast of Hudson Strait remain unknown due to a scarcity of observations. Hudson Strait inflow waters affect the physical and biogeochemical systems of the bay, as well as the marine

ecosystem, which supports the livelihoods of many Indigenous communities surrounding the Hudson Bay region. Here, we address this knowledge gap by analyzing data from two hydrographic surveys and four moorings deployed across the strait from 2008 and 2009. Three moorings were deployed on the northern side of the strait to map the inflow, and one was deployed on the southern side of the strait to capture the outflow. Along the southern side, a stratified, fresh outflow was observed, consistent with earlier studies. Along the northern coast, the inflow is weakly stratified and more saline, with seasonal changes distributed throughout the water column. Source waters of the inflow stem mainly from Arctic Water in

the Baffin Island Current. A comparison with historical data suggests that after modification in western Hudson Strait, part of the inflow enters northern Hudson Bay to become deep water in the bay.