cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Princess Kathleen enquiry of stranding
Creators: name: Canadian Pacific Railway. British Columbia Coast Steamship Service
Publisher: name: The University of British Columbia
Year: 2018

description: Photocopies of statements, a notice of investigation, and a letter regarding the questioning of John Douglas Meredith, Third Officer on the Princess Kathleen, regarding the "stranding of S. S. Princess Kathleen on Lena Point, Lynn Canal, Alaska, Sunday, September 7th, 1952".
Mixing the solar wind proton and electron scales. Theory and 2D-PIC simulations of firehose instability
Creators: name: López, R. A.
name: Micera, A.
name: Lazar, M.
name: Poedts, S.
name: Lapenta, G.
name: Zhukov, A. N.
name: Boella, E.
name: Shaaban, S. M.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Plasma Physics (physics.plasm-ph)
subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: Firehose-like instabilities (FIs) are cited in multiple astrophysical applications. Of particular interest are the kinetic manifestations in weakly-collisional or even collisionless plasmas, where these instabilities are expected to contribute to the evolution of macroscopic parameters. Relatively recent studies have initiated a realistic description of FIs, as induced by the interplay of both species, electrons and protons, dominant in the solar wind plasma. This work complements the current knowledge with new insights from linear theory and the first disclosures from 2D PIC simulations, identifying the fastest growing modes near the instability thresholds and their long-run consequences on the anisotropic distributions. Thus, unlike previous setups, these conditions are favorable to those aperiodic branches that propagate obliquely to the uniform magnetic field, with (maximum) growth rates higher than periodic, quasi-parallel modes. Theoretical predictions are, in general, confirmed by the simulations. The aperiodic electron FI (a-EFI) remains unaffected by the proton anisotropy, and saturates rapidly at low-level fluctuations. Regarding the firehose instability at proton scales, we see a stronger competition between the periodic and aperiodic branches. For the parameters chosen in our analysis, the a-PFI is excited before than the p-PFI, with the latter reaching a significantly higher fluctuation power. However, both branches are significantly enhanced by the presence of anisotropic electrons. The interplay between EFIs and PFIs also produces a more pronounced proton isotropization.
description: Accepted in ApJ
Selecting and Modelling Remnant AGNs with Limited Spectral Coverage
Creators: name: Quici, B.
name: Turner, R. J.
name: Seymour, N.
name: Hurley-Walker, N.
name: Shabala, S. S.
name: Ishwara-Chandra, C. H.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Quantifying the energetics and lifetimes of remnant radio-loud active galactic nuclei (AGNs) is much more challenging than for active sources due to the added complexity of accurately determining the time since the central black hole switched off. Independent spectral modelling of remnant lobes enables the derivation of the remnant ratio, $R_\mathrm{rem}$, (i.e. `off-time/source age'), thus reducing this complexity back to that of active sources however, the requirement of high-frequency ($\gtrsim5\,$GHz) coverage makes the application of this technique over large-area radio surveys difficult. In this work we propose a new method, which relies on the observed brightness of backflow of Fanaroff-Riley type~II lobes, combined with the \emph{Radio AGN in Semi-Analytic Environments} (RAiSE) code, to measure the duration of the remnant phase. Sensitive radio observations of the remnant radio galaxy J2253-34 are obtained to provide a robust comparison of this technique with the canonical spectral analysis and modelling methods. We find that the remnant lifetimes modelled by each method are consistent; spectral modelling yields $R_\mathrm{rem} = 0.23\pm0.02$, compared to $R_\mathrm{rem} = 0.26\pm0.02$ from our new method. We examine the viability of applying our proposed technique to low-frequency radio surveys using mock radio source populations, and examine whether the technique is sensitive to any intrinsic properties of radio AGNs. Our results show that the technique can be used to robustly classify active and remnant populations, with the most confident predictions for the remnant ratio, and thus off-time, in the longest-lived radio sources ($>50~$Myr) and those at higher redshifts ($z > 0.1$).
description: 20 pages, 9 figures, 8 tables. Accepted for publication to MNRAS
Price pass-through in UK fertiliser markets
Creators: name: Allan, Michael
Publisher: name: Unknown
Year: 2025
Subjects: subject: Agricultural and Food Policy
subject: Crop Production/Industries
subject: Fertiliser
subject: Pass-through
subject: NARDL

description: Fertiliser prices have received considerable attention recently owing to elevated volatility, high prices, and supply disruptions arising from shocks to factor markets. In the UK, the domestic production environment for nitrogen fertiliser has undergone structural change at the same time. This work uses nonlinear autoregressive distributed lag (NARDL) techniques to examine the dynamics of price transmission from international bulk fertiliser prices to UK prices. Analysis fails to find evidence for long run asymmetry, but does identify evidence of short run-asymmetry in transmission of shocks from bulk prices to domestic prices.
title: Collatz Conjecture Proof
title: Collatz's conjecture from an elementary point of view
titleType: Subtitle
Creators: name: ARDITO, NICOLA
Publisher: name: Zenodo
Year: 2025

description: Questo lavoro dimostra che la Congettura di Collatz è vera su ogni intero positivo (qualunque sia il numero di cifre che la compongono) perché nella mia particolare e veloce sequenza, equivalente alla canonica sequenza di Collatz (vengono considerati solo interi positivi dispari ad eccezione del numero iniziale N che può essere pari e i suoi successivi sono tutti dispari),  In ogni iterazione la somma dei passi positivi (indicati con B) aumenta sempre di 1 o 2 unità rispetto alla somma dei passi dispari (indicata con A) in modo che si arrivi ad un'iterazione in cui i valori di b e a sono tali che l'espressione successiva (3^a)*N/(2^b) è positiva e minore di 1 in modo che il numero finale della successione diventa (essendo sempre A numero intero positivo) è uguale a 1.
Spatially Resolved Moving Radio Burst in Association with an EUV Wave
Creators: name: Lu, Lei
name: Feng, Li
name: Gan, Weiqun
Publisher: name: arXiv
Year: 2022
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: Coronal mass ejections (CMEs) are large clouds of magnetized plasma ejected from the Sun, and are often associated with acceleration of electrons that can result in radio emission via various mechanisms. However, the underlying mechanism relating the CMEs and particle acceleration still remains a subject of heated debate. Here, we report multi-instrument radio and extreme ultraviolet (EUV) imaging of a solar eruption event on 24 September 2011. We determine the emission mechanism of a moving radio burst, identify its three-dimensional (3D) location with respect to a rapidly expanding EUV wave, and find evidence for CME shocks that produce quasiperiodic acceleration of electron beams.
description: 17 pages, 6 figures, accepted by APJL
Supplementary document for Continuous Programmable Mid-Infrared Thermal Emitter and Camouflage Based on In3SbTe2 Phase-Change Material - 6468577.pdf
Creators: name: Zhou, SiHong
name: Guo, Yanming
name: Zhu, Liangwei
name: Liu, Yi
name: Pan, QingHui
name: Shuai, Yong
name: Hu, Guangwei
Publisher: name: Optica Publishing Group
Year: 2025
Subjects: Uncategorized

description: Supplemental Document
Modeling Balmer line signatures of stellar CMEs
Creators: name: Leitzinger, Martin
name: Odert, Petra
name: Heinzel, Petr
Publisher: name: arXiv
Year: 2022
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: From the Sun we know that coronal mass ejections (CMEs) are a transient phenomenon, often correlated with flares. They have an impact on solar mass- and angular momentum loss, and therefore solar evolution, and make a significant part of space weather. The same is true for stars, but stellar CMEs are still not well constrained, although new methodologies have been established, and new detections presented in the recent past. So far, probable detections of stellar CMEs have been presented, but their physical parameters which are not directly accessible from observations, such as electron density, optical thickness, temperature, etc., have been so far not determined for the majority of known events. We apply cloud modeling, as commonly used on the Sun, to a known event from the literature, detected on the young dMe star V374 Peg. This event manifests itself in extra emission on the blue side of the Balmer lines. By determining the line source function from 1D NLTE modeling together with the cloud model formulation we present distributions of physical parameters of this event. We find that except for temperature and area all parameters are at the upper range of typical solar prominence parameters. The temperature and the area of the event were found to be higher than for typical solar prominences observed in Balmer lines. We find more solutions for the filament than for the prominence geometry. Moreover we show that filaments can appear in emission on dMe stars contrary to the solar case.
description: 17 pages, 13 figures, MNRAS accepted on 3rd of May, 2022
Multiple-access relay stations for long-haul fiber-optic radio frequency transfer
Creators: name: Li, Qi
name: Hu, Liang
name: Zhang, Jinbo
name: Chen, Jianping
name: Wu, Guiling
Publisher: name: arXiv
Year: 2022
Subjects: subject: Signal Processing (eess.SP)
subject: Instrumentation and Detectors (physics.ins-det)
subject: Optics (physics.optics)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Physical sciences

description: We report on the realization of a long-haul radio frequency (RF) transfer scheme by using multiple-access relay stations (MARSs). The proposed scheme with independent link noise compensation for each fiber sub-link effectively solves the limitation of compensation bandwidth for long-haul transfer. The MARS can have the capability to share the same modulated optical signal for the front and rear fiber sub-links, simplifying the configuration at the repeater station and enabling the transfer system to have the multiple-access capability. At the same time, we for the first time theoretically model the effect of the MARS position on the fractional frequency instability of the fiber-optic RF transfer, demonstrating that the MARS position has little effect on system's performance when the ratio of the front and rear fiber sub-links is around $1:1$. We experimentally demonstrate a 1 GHz signal transfer by using one MARS connecting 260 and 280 km fiber links with the fractional frequency instabilities of less than $5.9\times10^{-14}$ at 1 s and $8.5\times10^{-17}$ at 10,000 s at the remote site and of $5.6\times10^{-14}$ and $6.6\times10^{-17}$ at the integration times of 1 s and 10,000 s at the MARS. The proposed scalable technique can arbitrarily add the same MARSs in the fiber link, which has great potential in realizing ultra-long-haul RF transfer.
description: Accepted for publication in Optics Express
Barjols, atelier Fabre, échange entre Marius Fabre et un gendarme qui tient à la main le programme imprimé de la fête patronale
Creators: name: Musée National Des Arts Et Traditions Populaires (Paris)
name: Centre D'ethnologie Française
Publisher: name: École des Hautes Études en Sciences Sociales; Institut  interdisciplinaire d'anthropologie du contemporain (Paris); Laboratoire d'anthropologie et d'histoire de l'institution de la culture (Paris)
Year: 2024

Abstract
Modelling Star Cluster Formation: Mergers
Creators: name: Karam, Jeremy
name: Sills, Alison
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Star cluster formation in giant molecular clouds involves the local collapse of the cloud into small gas-rich subclusters, which can then subsequently collide and merge to build up the final star cluster(s). In this paper, we simulate collisions between these subclusters, using coupled smooth particle hydrodynamics for the gas and N-body dynamics for the stars. We are guided by previous radiation hydrodynamics simulations of molecular cloud collapse which provide the global properties of the colliding clusters, such as their stellar and gas masses, and their initial positions and velocities. The subclusters in the original simulation were treated as sink particles which immediately merged into a single entity after the collision. We show that the more detailed treatment provides a more complex picture. At collisional velocities above ~ 10 km/s, the stellar components of the cluster do not form a monolithic cluster within 3 Myr, although the gas may do so. At lower velocities, the clusters do eventually merge but over timescales that may be longer than the time for a subsequent collision. The structure of the resultant cluster is not well-fit by any standard density distribution, and the clusters are not in equilibrium but continue to expand over our simulation time. We conclude that the simple sink particle treatment of subcluster mergers in large-scale giant molecular cloud simulations provides an upper limit on the final cluster properties.
description: Accepted for publication in MNRAS, 11 pages, 12 figures
Novel Polysaccharide-Based Nanoparticles And Their Potential Appilcation In Biomedical Imaging
Creators: name: Božič Mojca
name: Bračič Matej
name: Tkaučič Doris
name: Hribernik Silvo
name: Kurečič Manja
name: Kargl Rupert
name: Spirk Stefan
name: Tamilselvan, Mohan
name: Stana-Kleinschek Karin
Publisher: name: Zenodo
Year: 2016
Subjects: Polysaccharide, Nanoparticles, Contrast agents, MRI imaging

description: Polysaccharide-based nanoparticles exhibit a great potential as holders for imaging and drug agents because of their intrinsic physicochemical properties being biocompatible and biodegradable. Moreover, they are highly stable, safe, non-toxic, hydrophilic and offer a large variety of functional groups, degree of branching (linear to highly branched) and molecular weight (low to high). Thus, they have a wide variety of composition and properties that cannot be replicated in a chemical laboratory, and the ease of their production makes various polysaccharides cheaper than synthetic polymers. Therefore, the use of polysaccharides as biomaterials is quite promising for biomedical applications.

In this work, we will discuss about polysaccharides being a key component in the development of contrast agents for the new magnetic resonance imaging technologies. In this context, different processing strategies for synthesizing different polysaccharide-based composite nanoparticles will be presented.
description: European Materials Research Society - Spring Meeting 2016, Symposium R (multifunctional nanostructures for diagnostic and therapeutic of diseases
Photoionized Herbig-Haro objects in the Orion Nebula through deep high-spectral resolution spectroscopy III: HH514
Creators: name: Méndez-Delgado, J. E.
name: Esteban, C.
name: García-Rojas, J.
name: Henney, W. J.
name: .
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We analyze the physical conditions and chemical composition of the photoionized Herbig-Haro object HH~514, which emerges from the proplyd 170-337 in the core of the Orion Nebula. We use high-spectral resolution spectroscopy from UVES at the Very Large Telescope and IFU-spectra from MEGARA at the Gran Telescopio de Canarias. We observe two components of HH~514, the jet base and a knot, with $n_{\rm e}= (2.3 \pm 0.1) \times 10^5 \text{cm}^{-3}$ and $n_{\rm e}= (7 \pm 1) \times 10^4 \text{cm}^{-3}$, respectively, both with $T_{\rm e}\approx 9000 \text{ K}$. We show that the chemical composition of HH~514 is consistent with that of the Orion Nebula, except for Fe, Ni and S, which show higher abundances. The enhanced abundances of Fe and Ni observed in HH objects compared with the general interstellar medium is usually interpreted as destruction of dust grains. The observed sulphur overabundance (more than two times solar) is challenging to explain since the proplyd photoevaporation flow from the same disk shows normal sulphur abundance. If the aforementioned S-overabundance is due to dust destruction, the formation of sulfides and/or other S-bearing dust reservoirs may be linked to planet formation processes in protoplanetary disks, which filter large sulfide dust grains during the accretion of matter from the disk to the central star. We also show that published kinematics of molecular emission close to the central star are not consistent with either a disk perpendicular to the optical jet, nor with an outflow that is aligned with it.
description: 19 pages, 9 figures. HH514. Accepted to be published in the Monthly Notices of the Royal Astronomical Society
Comment on: "Hyperfine structure measurements of Co I and Co II with Fourier transform spectroscopy" by Fu et al. [JQSRT 2021, 107590]
Creators: name: Ding, Milan
name: Pickering, Juliet C.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: This comment points out errors in the analysis of 61 magnetic hyperfine structure ($A$) constants of Co II energy levels by Fu et al. [JQSRT 2021, 107590]. The paper was published without full awareness of the extensive literature already available for Co II hyperfine $A$ constants at the time; 57 of 58 $A$ constants that were claimed to have been measured for the first time had already been measured by the prior work of Ding \& Pickering [ApJS 2020, 251:24], who had published $A$ constants for 292 levels of Co II. The $A$ constant of 3d$^6$4s$^2$ a$^5$D$_4$ has been determined by Fu et al. [JQSRT 2021, 107590] for the first time to be $12.0\pm1.8$ mK (1 mK $=$ 0.001 cm$^{-1}$), which was found to agree with line profiles observed by Ding \& Pickering [ApJS 2020, 251:24]. Discrepancies in 17 $A$ constants of Fu et al. [JQSRT 2021, 107590] were found, which are likely due to the analysis of weak, experimentally unclassified transitions with Ritz wavenumbers 25453.966 cm$^{-1}$ and 25149.948 cm$^{-1}$ by Fu et al. [JQSRT 2021, 107590] for the $A$ constants of the energy levels 3d$^7$($^2$G)4s a$^3$G$_5$ and 3d$^7$($^2$P)4s c$^3$P$_2$ respectively. Fewer transitions and poorer quality spectra analysed by Fu et al. [JQSRT 2021, 107590] are also concluded to have contributed to disagreements in the 17 $A$ constants.
Screening Mechanism and Late-time Cosmology: Role of a Chameleon-Brans-Dicke Scalar Field
Creators: name: Chakrabarti, Soumya
name: Dutta, Koushik
name: Said, Jackson Levi
Publisher: name: arXiv
Year: 2022
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We discuss a way in which the geometric scalar field in a Brans-Dicke theory can evade local astronomical tests and act as a driver of the late-time cosmic acceleration. This requires a self-interaction of the Brans-Dicke scalar as well as an interaction with ordinary matter. The scalar field in this construct acquires a density-dependent effective mass much like a Chameleon field. We discuss the viability of this setup in the context of the Equivalence Principle, Fifth Force, and Solar System tests. The cosmological consistency is adjudged in comparison with observational data from recalibrated light curves of type Ia supernova (JLA), the Hubble parameter measurements (OHD), and the Baryon Acoustic Oscillation (BAO). We deduct that the astrophysical constraints indeed favor the existence of a mild scalar-matter interaction in the Jordan Frame.
description: 14 pages, 10 figures, Accepted for publication in MNRAS
Wide binary pulsars from electron-capture supernovae
Creators: name: Stevenson, Simon
name: Willcox, Reinhold
name: Vigna-Gomez, Alejandro
name: Broekgaarden, Floor
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Neutron stars receive velocity kicks at birth in supernovae. Those formed in electron-capture supernovae from super asymptotic giant branch stars -- the lowest mass stars to end their lives in supernovae -- may receive significantly lower kicks than typical neutron stars. Given that many massive stars are members of wide binaries, this suggests the existence of a population of low-mass ($1.25 < M_\mathrm{psr} / $M$_\odot < 1.3$), wide ($P_\mathrm{orb} \gtrsim 10^{4}$\,day), eccentric ($e \sim 0.7$), unrecycled ($P_\mathrm{spin} \sim 1$\,s) binary pulsars. The formation rate of such binaries is sensitive to the mass range of (effectively) single stars leading to electron capture supernovae, the amount of mass lost prior to the supernova, and the magnitude of any natal kick imparted on the neutron star. We estimate that one such binary pulsar should be observable in the Milky Way for every 10,000 isolated pulsars, assuming that the width of the mass range of single stars leading to electron-capture supernovae is $\lesssim 0.2$\,M$_\odot$, and that neutron stars formed in electron-capture supernovae receive typical kicks less than 10\,km s$^{-1}$. We have searched the catalog of observed binary pulsars, but find no convincing candidates that could be formed through this channel, consistent with this low predicted rate. Future observations with the Square Kilometre Array may detect this rare sub-class of binary pulsar and provide strong constraints on the properties of electron-capture supernovae and their progenitors.
description: Accepted to MNRAS. 7 pages, 2 figures
Dr Jean Marie Yombo, Le chaos urbain dans « African psycho » d’Alain Mabanckou
Creators: name: Marie Yombo, Jean
Publisher: name: figshare
Year: 2024
Subjects: classificationCode: 470501
subject: African literature
classificationCode: 470507
subject: Comparative and transnational literature
classificationCode: 470514
subject: Literary theory
classificationCode: 470516
subject: Literature in French

description: Dr Jean Marie Yombo, Le chaos urbain dans « African psycho » d’Alain Mabanckou
Multiferroic materials based on transition-metal dichalcogenides: Potential platform for reversible control of Dzyaloshinskii-Moriya interaction and skyrmion via electric field
Creators: name: Shao, Ziji
name: Liang, Jinghua
name: Cui, Qirui
name: Chshiev, Mairbek
name: Fert, Albert
name: Zhou, Tiejun
name: Yang, Hongxin
Publisher: name: arXiv
Year: 2022
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Exploring novel two-dimensional multiferroic materials that can realize electric-field control of two-dimensional magnetism has become an emerging topic in spintronics. Using first-principles calculations, we demonstrate that non-metallic bilayer transition metal dichalcogenides (TMDs) can be an ideal platform for building multiferroics by intercalated magnetic atoms. Moreover, we unveil that with Co intercalated bilayer MoS2, Co(MoS2)2, two energetic degenerate states with opposite chirality of Dzyaloshinskii-Moriya interaction (DMI) are the ground states, indicating electric-field control of the chirality of topologic magnetism such as skyrmions can be realized in this type of materials by reversing the electric polarization. These findings pave the way for electric-field control of topological magnetism in two-dimensional multiferroics with intrinsic magnetoelectric coupling.
description: To appear in Phys. Rev. B
Northwest Atlantic regional ocean climatology.
Creators: name: Seidov, Dan, 1948-
Publisher: name: U.S. Department of Commerce, National Oceanic and Atmospheric Administration, National Environmental Satellite, Data, and Information Service, National Centers for Environmental Information
Year: 2016
Subjects: subject: Ocean currents--North Atlantic Ocean.

description: The Northwest Atlantic Ocean (NWA) plays a crucial role in global climate change. The Gulf Stream and North Atlantic Current System are the key elements of northward heat transport and the Meridional Overturning Circulation in the North Atlantic Ocean. The NWA includes a resource-rich coastal zone with abundant fisheries and other natural resources. Its economic significance and climatic importance resulted in many observational and research programs spanning over many decades. To provide a more solid and improved oceanographic foundation and reference for multidisciplinary studies of the NWA, the Regional Climatology Team at the National Centers for Environmental Information (NCEI), formerly the National Oceanographic Data Center (NODC) in Silver Spring, Maryland, USA, developed a new set of high-resolution, qualitycontrolled, long-term annual, seasonal, and monthly mean temperature and salinity fields at different depth levels in the NWA region. This new regional climatology is based on the temperature and salinity profiles from oceanographic in situ observations spanning more than one hundred years archived in the World Ocean Database (WOD). When computing anomalies from a climatology, i.e., from the temperature and salinity fields averaged over several decades, the mesoscale field is smoothed to prevent generation of spurious anomalies. The smoothing depends on the spatial grid resolution and thus can cause differences in climatological fields because of smoothing. On finer resolution grids with lesser smoothing, climatic residual of mesoscale eddies with spatial scale longer than grid cell sizes can be directly resolved and the remaining mesoscale background presumably represents the cumulative effect of mesoscale dynamics rather than a noise caused by objective analysis. The advantage of high-resolution analysis becomes obvious as the use of shorter influence radii in the objective interpolation procedure leads to less smoothing in the region of sharp frontal zones, especially in the coastal regions. In a sense, the finer-resolution analysis pursues the same goal as using progressively reduced grid sizes did in making headway from coarse-resolution to eddy-permitting and then to eddy-resolving numerical models of ocean circulation. The high-resolution regional climatologies are closing the gaps between observations and model simulations, which allows meaningful data-model comparisons in critical data-rich regions, such as the NWA.
Quantum-Enhanced Robotics: Solving Complexity with Next-Generation Computing
Creators: name: Beneventi, Jesse
name: Li, Sihui
Publisher: name: Zenodo
Year: 2025

description: Published in NRT-LEAD Annual Expo-2025 Booklet.
description: As robotics systems grow in complexity, traditional computational approaches are increasingly constrained by the scale and speed required for optimization and learning tasks. Jesse’s research explores the potential of quantum computing algorithms to address critical challenges in robotics, emphasizing motion planning, decision-making, and high-dimensional state estimation.  By utilizing quantum algorithms such as Grover's search and the Quantum Approximate Optimization Algorithm (QAOA), this research seeks to demonstrate significant computational advantages in solving NP-hard problems frequently encountered within robotic systems. Additionally, the research investigates hybrid quantum-classical integration strategies within robotic control loops, especially those demanding real-time responsiveness. Initial findings indicate that quantum-enhanced methods could substantially improve path planning efficiency, reduce problem-solving latency, and optimize system performance, marking a significant step toward quantum-accelerated intelligent robotics. Despite these promising results, current quantum computing technology faces significant limitations, particularly concerning error rates, which affect computational accuracy. With ongoing advancements in quantum computing, Jesse aims to develop robust, quantum-assisted algorithms capable of transforming the future of robotic motion planning.
The Twin Radio galaxy TRG J104454+354055
Creators: name: Gopal-Krishna
name: Joshi, Ravi
name: Patra, Dusmanta
name: Yang, Xiaolong
name: Ho, Luis C.
name: Wiita, Paul J.
name: Omar, Amitesh
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We report observations of a bright dumb-bell system of galaxies ($z =0.162$) with the upgraded Giant Metrewave Radio Telescope ($u$GMRT), which show that each member of this gravitationally bound pair of galaxies hosts bipolar radio jets extended on 100 kiloparsec scales. Only two cases of such radio morphology have been reported previously, both being dumb-bell systems, as well. The famous first example, 3C 75, was discovered 4 decades ago, and the second case was discovered 3 decades ago. This implies that such `Twin-Radio-Galaxies' (TRGs) are an exceedingly rare phenomenon. As in the case of its two senior cousins, the bi-polar radio jets of the present TRG (J104454+354055) exhibit strong wiggles and are edge-darkened (Fanaroff-Riley class I). However, there are important differences, too. For instance, the jets in the present TRG do not merge and, moreover, show no signs of distortion due to an external crosswind. This makes the present TRG a much neater laboratory for studying the physics of (sideway) colliding jets of relativistic plasma. This TRG has a Wide-Angle-Tail (WAT) neighbour hosted by another bright galaxy belonging to the same group, which appears to be moving towards the TRG.
description: 5 Pages, 2 Figures, Accepted for Publication in MNRAS-LETTERs
Redshifts of radio sources in the Million Quasars Catalogue from machine learning
Creators: name: Curran, S. J.
name: Moss, J. P.
name: Perrott, Y. C.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: With the aim of using machine learning techniques to obtain photometric redshifts based upon a source's radio spectrum alone, we have extracted the radio sources from the Million Quasars Catalogue. Of these, 44,119 have a spectroscopic redshift, required for model validation, and for which photometry could be obtained. Using the radio spectral properties as features, we fail to find a model which can reliably predict the redshifts, although there is the suggestion that the models improve with the size of the training sample. Using the near-infrared--optical--ultraviolet bands magnitudes, we obtain reliable predictions based on the 12,503 radio sources which have all of the required photometry. From the 80:20 training--validation split, this gives only 2501 validation sources, although training the sample upon our previous SDSS model gives comparable results for all 12,503 sources. This makes us confident that SkyMapper, which will survey southern sky in the u, v, g, r, i, z bands, can be used to predict the redshifts of radio sources detected with the Square Kilometre Array. By using machine learning to impute the magnitudes missing from much of the sample, we can predict the redshifts for 32,698 sources, an increase from 28% to 74% of the sample, at the cost of increasing the outlier fraction by a factor of 1.4. While the "optical" band data prove successful, at this stage we cannot rule out the possibility of a radio photometric redshift, given sufficient data which may be necessary to overcome the relatively featureless radio spectra.
description: Accepted by MNRAS
Characteristics and evolution of Be-type high mass X-ray binaries as potential Ultraluminous X-ray Sources
Creators: name: Karino, Shigeyuki
Publisher: name: arXiv
Year: 2022
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Some ultraluminous X-ray sources (ULXs) exhibit X-ray pulses, and their central sources are thought to be neutron stars. It has also been suggested that some are transient sources with Be-type donors. In this study, we use the mass accretion model of a Be-type high mass X-ray binary (BeHMXB) to estimate the conditions under which a giant X-ray burst caused by a BeHMXB exceeds the Eddington luminosity. Moreover, we investigate the duration for which BeHMXBs can be observed as transient ULXs with bursts above the Eddington luminosity during binary evolutions. The results indicate that BeHMXBs could be ULXs for a typical duration of approximately 1 Myr. Comparisons with nearby observed BeHMXBs indicate that many binary systems have the potential to become ULXs during their evolution. Particularly, a BeHMXB system tends to become a ULX when the Be donor has a dense deccretion disc aligned with the orbital plane. Because BeHMXBs are very common objects and a significant number of them can become ULXs, we conclude that a reasonable fraction of the observed ULXs could consist of evolved BeHMXBs.
description: Accepted for publication in MNRAS. 9 pages, 6 figures
Investigating the Contribution of Extended Radio Sources to the Epoch of Reionisation Power Spectrum
Creators: name: Cook, J H.
name: Trott, C. M.
name: Line, J. L. B.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We investigate the contribution of extended radio sources such as Centaurus A, and Galactic supernova remnants (SNRs) to our ability to detect the statistical $21\,\rm{cm}$ signal from the Epoch of Reionisation (EoR) with the Murchison Widefield Array (MWA). These sources are typically ignored because they are in highly attenuated parts of the MWA primary beam, however in aggregate these sources have apparent flux densities of $10\,\rm{Jy}$ on angular scales we expect to detect the $21\,\rm{cm}$ signal. We create bespoke multi-component 2D Gaussian models for Galactic SNRs and for Centaurus A, and simulate the visibilities for two MWA snapshot observations. We grid those visibilities and then Fourier transform them with respect to frequency, averaging them both spherically and cylindrically to produce the 1D and 2D power spectra. We compare the simulated 1D power spectra to the expected $21\,\rm{cm}$ power spectrum. We find that although these extended sources are in highly attenuated parts of the MWA primary beam pattern, collectively they have enough power ($\sim10^4-10^5\,\rm{mK^2}\,\it{h^{-3}} \,\rm{Mpc^{3}}$) on EoR significant modes ($|\mathbf{k}| \leq 0.1 h \rm{Mpc}^{-1}$) to prohibit detection of the $21\,\rm{cm}$ signal ($10^4\,\rm{mK^2}\,\it{h^{-3}} \,\rm{Mpc^{3}}$). We find that $50-90\%$ of sources must be removed in order to reduce leakage to a level of $10-20\%$ of the $21\,\rm{cm}$ power spectrum on EoR significant modes. The effects of widefield extended sources will have implications on the detectability of the $21\,\rm{cm}$ signal for the MWA and with the future Square Kilometre Array (SKA).
description: 17 pages, 8 png figures
Classification of static black holes in Einstein phantom/dilaton Maxwell/anti-Maxwell gravity systems
Creators: name: Rogatko, Marek
Publisher: name: arXiv
Year: 2022
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The uniqueness theorem for static, spherically symmetric, asymptotically flat, higher dimensional phantom black holes, with non-degenerate event horizon , being the solutions of Einstein phantom/dilaton Maxwell/anti-Maxwell gravity systems is considered. Conformal positive energy theorem and conformal transformations authorize the crucial tools for exploiting the boundary conditions and conformal flatness.
description: 14 pages, RevTex, to be published in Phys. Rev.D15. arXiv admin note: text overlap with arXiv:1803.08296
Supplement for Motor sequence learning elicits mu peak-specific corticospinal plasticity
Creators: name: Suresh, Tharan
name: Hussain, Sara
Publisher: name: Zenodo
Year: 2025
Subjects: subject: motor learning
subject: Sensorimotor Cortex
subject: sensorimotor rhythms
subject: brain stimulation

description: Supplemental material for the manuscript titled "Motor sequence learning elicits mu peak-specific corticospinal plasticity"
A dearth of close-in planets around rapidly rotating stars or a dearth of data?
Creators: name: Messias, Y. S.
name: de Oliveira, L. L. A.
name: Gomes, R. L.
name: Gonçalves, M. I. Arruda
name: Martins, B. L. Canto
name: Leão, I. C.
name: De Medeiros, J. R.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: A dearth of close-in planets orbiting rapid rotators was reported almost a decade ago. According to this view only slowly spinning stars with rotation periods longer than 5-10 days would host planets with orbital periods shorter than 2 or 3 days. This Letter brings an enlarged and more detailed analysis that led us to the question: Is there really a dearth in that distribution or is it a dearth of data? For this new analysis, we combined different samples of Kepler and TESS stars with confirmed planets or planet candidates with measured stellar rotation periods, using Gaia data to perform an in-depth selection of 1013 planet-hosting main-sequence stars. With the newer, enlarged, and more refined data, the reported dearth of close-in planets orbiting rapid rotators tends to disappear, thus suggesting that it may reflect a scarcity of data in the prior analysis. A two sample statistical test strongly supports our results, showing that the distribution of close-in planets orbiting rapid rotators is almost indistinguishable from that for close-in planets orbiting slow rotators.
description: 6 pages, 2 figures, 1 table, accepted for publication in ApJ Letters
Lessons learned from Milan electric power distribution networks data analysis during COVID-19 pandemic
Creators: name: Bosisio, Alessandro
name: Soldan, Francesca
name: Morotti, Andrea
name: Iannarelli, Gaetano
name: Bionda, Enea
name: Grillo, Samuele
Publisher: name: arXiv
Year: 2022
Subjects: subject: Physics and Society (physics.soc-ph)
subject: FOS: Physical sciences

description: COVID-19 pandemic has been a disruptive event from health, social, and economic points of view. Besides that, changes in people's lifestyles, especially during the 2020 lockdowns, also affected energy networks. COVID-19 pandemic has resulted in a significant decline in electricity demand. The lockdown measures applied to handle the health crisis have caused the most relevant energy impact of the last years. In this paper, the local experiences of the distribution network of Milano, a city in northern Italy, are reported. The analysis starts with a summary of the restrictions imposed during 2020 and focuses on both active and reactive power flows, and faults. To this end, a comparison with 2019 data has been performed, highlighting the main differences with 2020. The outcome of the analysis is a valuable tool to predict urban distribution networks behavior during times of disruption, helping distribution system operators to prepare feasible short-term and long-term resilience plans.
Barjols, atelier Fabre, fabrication du tambourin, placement des "réganches" (poignées)
Creators: name: Musée National Des Arts Et Traditions Populaires (Paris)
name: Centre D'ethnologie Française
Publisher: name: École des Hautes Études en Sciences Sociales; Institut  interdisciplinaire d'anthropologie du contemporain (Paris); Laboratoire d'anthropologie et d'histoire de l'institution de la culture (Paris)
Year: 2024

Abstract
The first 7 months of the 2020 X-ray outburst of the magnetar SGR J1935+2154
Creators: name: Borghese, Alice
name: Zelati, Francesco Coti
name: Israel, Gian Luca
name: Pilia, Maura
name: Burgay, Marta
name: Trudu, Matteo
name: Zane, Silvia
name: Turolla, Roberto
name: Rea, Nanda
name: Esposito, Paolo
name: Mereghetti, Sandro
name: Tiengo, Andrea
name: Possenti, Andrea
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The magnetar SGR J1935+2154 underwent a new active episode on 2020 April 27-28, when a forest of hundreds of X-ray bursts and a large enhancement of the persistent flux were detected. For the first time, a radio burst with properties similar to those of fast radio bursts and with a X-ray counterpart was observed from this source, showing that magnetars can power at least a group of fast radio bursts. In this paper, we report on the X-ray spectral and timing properties of SGR J1935+2154 based on a long-term monitoring campaign with Chandra, XMM-Newton, NuSTAR, Swift and NICER covering a time span of ~7 months since the outburst onset. The broadband spectrum exhibited a non-thermal power-law component (photon index~1.2) extending up to ~20-25 keV throughout the campaign and a blackbody component with temperature decreasing from ~1.5 keV at the outburst peak to ~0.45 keV in the following months. We found that the luminosity decay is well described by the sum of two exponential functions, reflecting the fast decay (~1 d) at the early stage of the outburst followed by a slower decrease (~30 d). The source reached quiescence about ~80 days after the outburst onset, releasing an energy of ~6e40 erg during the outburst. We detected X-ray pulsations in the XMM-Newton data sets and derived an average spin-down rate of ~3.5e-11 s/s using the spin period measurements derived in this work and three values reported previously during the same active period. Moreover, we report on simultaneous radio observations performed with the Sardinia Radio Telescope. No evidence for periodic or single-pulse radio emission was found.
description: 17 pages, 5 figures, 4 tables. Accepted for publication in MNRAS
Does an expanded allied health student training programme in regional New South Wales (Australia) result in a positive social return on investment? A protocol for a single-university education-based economic evaluation
Creators: name: Nott, Melissa
name: Green, Elyce
name: Anderson, Micheal
name: French, Louise
name: Lander, Chelsea
name: McAleer, Rachael
name: Brusco, Natasha
Publisher: name: La Trobe
Year: 2024

description: Introduction: 20 years ago, health professional student placements in rural areas of Australia were identified as an important rural recruitment strategy and funding priority. Since then, there has been a growing body of research investigating the value, impact, barriers and facilitators of student placements in rural areas of Australia. Charles Sturt University, Three Rivers Department of Rural Health, was recently awarded an Australian Government grant to expand their Rural Health Multidisciplinary Training (RHMT) programme, designed to increase multi-disciplinary student placements in rural areas of New South Wales (NSW), Australia. The aim of this study is to determine if the expanded RHMT has a positive social return on investment (SROI). Methods and analyses: The RHMT Programme will expand into the Forbes/Parkes/Lachlan local government areas of NSW where there is a population of 21 004 people, including 3743 First Nations peoples. Data collection includes collecting programme outputs, programme costs and conducting surveys and interviews with students, host organisations, supervisors and community members including First Nations peoples. The SROI will quantify the ‘investment’ required to implement the RHMT programme, as well as the ‘social return’ on the RHMT programme from the student, organisational, supervisor and community perspectives. The SROI will compare the combined cost with the combined return, from a societal perspective, including a 3-year time horizon, with cost data presented in $A 2024/25. Discussion: The findings of this SROI study may influence future Australian government investment in RHMT as a mechanism for supporting rural allied health recruitment and for investing in the local rural economy. Ethics and dissemination: This study has been approved by the Charles Sturt University Human Research Ethics Committee (#H23589) and the Aboriginal Health and Medical Research Council of New South Wales (#2130/23). Results will be disseminated via a peer-review journal publication, as well as conference presentations.
Reflection Symmetry in the Folded Light Curve of the Crab Pulsar from NICER
Creators: name: Vivekanand, M.
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The Rotation powered pulsars Crab, Vela and Geminga have double peaked folded light curves (FLC) at $γ$-ray energies, that have an approximate reflection symmetry. Here this aspect is studied at soft X-ray energy by analyzing a high resolution FLC of the Crab pulsar obtained at $1 - 10$ keV using the {\it{NICER}} observatory. The rising edge of the first peak of the FLC and the reflected version of the falling edge of the second peak are compared in several ways, and phase ranges are identified where the two curves are statistically similar. The best matching occurs when the two peaks are aligned, but only in a small phase range of $\approx 0.0244$ just below their peaks; their mean difference is $-0.78 \pm 1.8$ photons/sec with a reduced $χ^2$ of $0.93$. If the first curve is convolved by a Laplace function, the corresponding numbers are phase range of $\approx 0.0274$, mean difference of $-1.23 \pm 1.30$ and $χ^2$ of $0.76$. These phase ranges are much smaller than those over which the reflection symmetry has been perceived. Therefore the only way the two edges can have a mirror relation over a substantial phase range is if one invokes a broad and faint emission component of amplitude $\approx 100$ photons/sec and width $\approx 0.1$ in phase, centered at phase $\approx 0.1$ beyond the second peak.
description: Accepted for publication in MNRAS