cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
A new look at the frequency-dependent damping of slow-mode waves in the solar corona
Creators: name: Kolotkov, Dmitrii Y.
name: Nakariakov, Valery M.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Being directly observed in the Doppler shift and imaging data and indirectly as quasi-periodic pulsations in solar and stellar flares, slow magnetoacoustic waves offer an important seismological tool for probing many vital parameters of the coronal plasma. A recently understood active nature of the solar corona for magnetoacoustic waves, manifested through the phenomenon of wave-induced thermal misbalance, led to the identification of new natural mechanisms for the interpretation of observed properties of waves. A frequency-dependent damping of slow waves in various coronal plasma structures remains an open question, as traditional wave damping theories fail to match observations. We demonstrate that accounting for the back-reaction caused by thermal misbalance on the wave dynamics leads to a modification of the relationship between the damping time and oscillation period of standing slow waves, prescribed by the linear theory. The modified relationship is not of a power-law form and has the equilibrium plasma conditions and properties of the coronal heating/cooling processes as free parameters. It is shown to readily explain the observed scaling of the damping time with period of standing slow waves in hot coronal loops. Functional forms of the unknown coronal heating process, consistent with the observed frequency-dependent damping, are seismologically revealed.
description: Accepted for publication in MNRAS Lett
Inter-sectoral Capital Flow, Labor Transfer, and Land Circulation in China: A Simultaneous Equations Approach
Creators: name: Dong, Qi
Publisher: name: Unknown
Year: 2025
Subjects: subject: Agribusiness
subject: Agricultural and Food Policy
subject: Agricultural Finance
subject: Labor and Human Capital
subject: Agricultural Surplus
subject: Capital Flow
subject: Labor Transfer
subject: Land Circulation
subject: Foreign Investment

description: This study builds a simultaneous equation system of inter-sectoral factors flows and constructed supply-and-demand models of sectoral capital investment with the effects of inter-sectoral factors flows taken into account. Then, it adopts the three-stage estimation to model the simultaneous equation system and the supply-and-demand models using China’s macro data. The empirical results confirm the inner relationship between capital flow, labor transfer, and land circulation during China’s structural transformation. More specially, we find that inter-sectoral capital flow and land circulation are mutually reinforced by each other. Rural-urban migration promotes the land circulation from the agricultural sector to the non-agricultural sector but the land circulation from the agricultural sector to the non-agricultural sector hinders labor transfer. Labor transfer is confirmed to have a positive effect on capital flow but the opposite is not true.
X-ray Eclipse Mapping Constrains the Binary Inclination and Mass Ratio of Swift J1858.6-0814
Creators: name: Knight, Amy H.
name: Ingram, Adam
name: Middleton, Matthew
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: X-ray eclipse mapping is a promising modelling technique, capable of constraining the mass and/or radius of neutron stars (NSs) or black holes (BHs) in eclipsing binaries and probing any structure surrounding the companion star. In eclipsing systems, the binary inclination, $i$, and mass ratio, $q$ relate via the duration of totality, $t_{e}$. The degeneracy between $i$ and $q$ can then be broken through detailed modelling of the eclipse profile. Here we model the eclipses of the NS low-mass X-ray binary Swift J1858.6$-$0814 utilising archival NICER observations taken while the source was in outburst. Analogous to EXO 0748$-$676, we find evidence for irradiation driven ablation of the companion's surface by requiring a layer of stellar material to surround the companion star in our modelling. This material layer extends $\sim 7000 - 14000$ km from the companion's surface and is likely the cause of the extended, energy-dependent and asymmetric ingress and egress that we observe. Our fits return an inclination of $i \sim 81^{\circ}$ and a mass ratio $q \sim 0.14$. Using Kepler's law to relate the mass and radius of the companion star via the orbital period ($\sim$ 21.3 hrs), we subsequently determine the companion to have a low mass in the range $0.183 M_{\odot} \leq M_{cs} \leq 0.372 M_{\odot}$ and a large radius in the range $1.02 R_{\odot} \leq R_{cs} \leq 1.29 R_{\odot}$. Our results, combined with future radial velocity amplitudes measured from stellar absorption/emission lines, can place precise constraints on the component masses in this system.
description: 12 pages, 8 figures, accepted for publication in MNRAS
Hofstadter butterflies in magnetically modulated graphene bilayer: an algebraic approach
Creators: name: Arora, Manisha
name: Sachdeva, Rashi
name: Ghosh, Sankalpa
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: It has been shown that Bernal stacked bilayer graphene (BLG) in a uniform magnetic field demonstrates integer quantum Hall effect with a zero Landau-level anomaly \cite{Geimbilayer}. In this article we consider such system in a two dimensional periodic magnetic modulation with square lattice symmetry. It is shown algebraically that the resulting Hofstadter spectrum can be expressed in terms of the corresponding spectrum of monolayer graphene in a similar magnetic modulation. In the weak-field limit, using the tight-binding model, we also derive the Harper-Hofstadter equation for such BLG system in a periodic magnetic modulation. We further demonstrate the topological quantisation of Hall conductivity in such system and point out that the quantised Hall plateaus are equally spaced for all quantum numbers for the quantised Hall conductivity.
description: Accepted for Publication in Physica E (Low dimensional systems and Nanostructures)
Supplementary document for Generation of Bloch Surface Beams with Arbitrarily Designed Phases - 6468642.pdf
Creators: name: xiang, yifeng
name: Lu, Qijing
name: Wang, Ruxue
Publisher: name: Optica Publishing Group
Year: 2025
Subjects: Uncategorized

description: The dispersion relation of the BSW and internal modes; Excited BSW field of a single hole; Diffraction intensity for different excitation methods; Diffracted BSW field for a periodic array.
A List of 49 New Stellar Twins from the Kepler Catalog of Eclipsing Binary Stars
Creators: name: Yücel, Gökhan
name: Bakış, Volkan
Publisher: name: arXiv
Year: 2022
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: 49 new eclipsing twin binary candidates are identified and analyzed based on Kepler eclipsing binary light curves. Their colours and spectral types are calculated according to our classification. A comparison of the spectral type distribution of eclipsing twin binary systems showed that F-type twins dominate among others, which agrees well with recent studies. The distance of eclipsing twin binaries from the galactic plane shows that F and G-type twins can be seen at any distance from the galactic plane and most of the known eclipsing binary twins are located within 200 pc of the galactic plane, which could be interpreted as these systems are members of thin disk population. As a case study, a twin binary system selected from our updated list of twins, V396~Gem, has been analyzed with spectroscopic and Kepler data. As a result, we have derived the physical parameters of the components of V396~Gem as $M_{1,2}(M_\odot)= 1.814\pm0.114$, $1.797\pm0.114$; $R_{1,2}(R_\odot)= 2.655\pm0.078$, $2.659\pm0.090$; $T_{\mathrm{eff}_{1,2}}(K)=7000\pm100$, $6978\pm100$; $[M/H]=0.11\pm0.03$. We have calculated the evolutionary status of the components by using MESA. Accurately derived physical parameters of the components of V396~Gem have allowed us to determine the age of the system as 1.168$\pm$0.149 Byrs.
description: 9 pages, 10 figures
Maximally informed Bayesian modelling of disc galaxies
Creators: name: Rigamonti, Fabio
name: Dotti, Massimo
name: Covino, Stefano
name: Haardt, Francesco
name: Landoni, Marco
name: Del Pozzo, Walter
name: Lupi, Alessandro
name: Zibetti, Stefano
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Dissecting the underlying structure of galaxies is of main importance in the framework of galaxy formation and evolution theories. While a classical bulge+disc decomposition of disc galaxies is usually taken as granted, this is only rarely solidly founded upon the full exploitation of the richness of data arising from spectroscopic studies with integral field units. In this work we describe a fully Bayesian estimation method of the global structure of disc galaxies which makes use of the wealth of photometric, kinematic, and mass-to-light ratio data, and that can be seen as a first step towards a machine-learning approach, certainly needed when dealing with larger samples of galaxies. Ours is a novel, hybrid line of action in tackling the problem of galactic parameter estimation, neither purely photometric nor orbit-based. Being rooted on a nested sampler, our code, which is available publicly as an online repository, allows for a statistical assessment of the need for multiple components in the dissecting process. As a first case-study the GPU-optimized code is applied to the S0 galaxy NGC-7683, finding that in this galaxy a pseudo-bulge, possibly the remnant of a bar-like structure, does exist in the center of the system. These results are then tested against the publicly available, orbit-based code DYNAMITE, finding substantial agreement.
description: 14 pages, 7 figures, accepted for publication in MNRAS
Dancing with the stars: Stirring up extraordinary turbulence in Galactic center clouds
Creators: name: Tassis, Konstantinos
name: Pavlidou, Vasiliki
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: Molecular clouds in the central molecular zone (CMZ) have been observed to feature turbulent line widths that are significantly higher, and scale with cloud size more steeply, than in the rest of the Milky Way. In the same Galactic region, the stellar density is also much higher than in the rest of the Milky Way, and the vertical stellar velocity dispersion is large, meaning that even young stars are likely to cross the entire vertical extent of the CMZ within their lifetimes. Here, we investigate whether interactions of CMZ molecular clouds with crossing stars can account for the extraordinary properties of observed turbulence in this part of the Galaxy. We calculated the rate of energy deposition by stars crossing CMZ clouds due to (a) stellar winds and (b) dynamical friction, and compared it to the rate of turbulence decay. We calculated the predicted scaling of turbulence line width with cloud size in each case. We find that energy deposition by stellar winds of crossing massive stars can account for both the level and the scaling of CMZ cloud turbulence with cloud size. We also find that the mechanism stops being effective at a Galactocentric distance comparable to the CMZ extent. On the other hand, we find that dynamical friction by crossing stars does not constitute a significant driver of turbulence for CMZ clouds.
description: 3 pages, comments welcome, accepted for publication in Astronomy and Astrophysics Letters
Machine Learning for Molecular Reactivity Predictions
Creators: name: Liu, Zhen
Publisher: name: Carnegie Mellon University
Year: 2025
Subjects: classificationCode: 3407
subject: Theoretical and computational chemistry
classificationCode: 34
subject: Chemical sciences
subject: FOS: Chemical sciences

description: Computational methods are valuable for designing experiments and understanding experimental results, but they often face a trade-off between accuracy and efficiency. This dissertation developed chemical machine learning software for predicting molecular reactivity. The thesis first details the development of Auto3D, an ML package for low-energy conformer generation and molecular property predictions. Auto3D includes the ANI and AIMNet families of machine learning interatomic potentials (MLIPs), which can reliably compute molecular energy at quantum mechanical (QM) level fidelity using just a fraction of the time required for QM methods. With these MLIPs, Auto3D can accurately and efficiently search for low-energy conformers and tautomers, perform single-point energy calculations, optimize geometries, and compute thermodynamic properties. The power of Auto3D was demonstrated in applications for predicting reaction feasibility. We took both top-down and bottom-up approaches to reaction feasibility predictions. For the top-down approach, the goal was to directly predict amide cou pling reaction yield based on the reaction information, such as reactants, products, and conditions. Auto3D was applied to obtain conformers for the molecules and derive reaction features. Using a stacking technique on these reaction descriptors, the yield prediction accuracy achieved an R2 of 0.457 ± 0.006. This was the best yield prediction accuracy on a large literature dataset of amide coupling reactions. Error analysis revealed that balancing model sensitivity and robustness is another significant challenge in training accurate yield prediction models, in addition to the commonly held belief regarding the lack of low-yield reactions and yield report bias. For the bottom-up approach, we first predicted molecular properties and then fore casted their reaction activity. Specifically, Auto3D and AIMNet2 were used to develop a workflow to automatically compute the ring strain energy (RSE) for cyclic molecules. This workflow is consistent with the corresponding DFT method (ωB97M/Def2 TZVPP) with an MAE of 0.90 kcal/mol. The computed RSE demonstrated a strong correlation with reaction outcomes in copper-free click reactions and ring-opening metathesis polymerization reactions. Overall, this dissertation demonstrates the potential of machine learning methods, particularly MLIPs, in the development of computational methods and in computer assisted experiment design.
Dr Philippe Bienvenu Ndoubena, La création théâtrale contemporaine et les représentations sociales au Cameroun
Creators: name: Bienvenu Ndoubena, Philippe
Publisher: name: figshare
Year: 2024
Subjects: classificationCode: 470501
subject: African literature
classificationCode: 470507
subject: Comparative and transnational literature
classificationCode: 470508
subject: Digital literature
classificationCode: 470514
subject: Literary theory
classificationCode: 470516
subject: Literature in French

description: Dr Philippe Bienvenu Ndoubena, La création théâtrale contemporaine et les représentations sociales au Cameroun
Satellite galaxies in groups in the CIELO Project I. Gas removal from galaxies and its re-distribution in the intragroup medium
Creators: name: Rodríguez, S.
name: Lambas, D. Garcia
name: Padilla, N. D.
name: Tissera, P.
name: Bignone, L.
name: Dominguez-Tenreiro, R.
name: Gonzalez, R.
name: Pedrosa, S.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We study the impact of the environment on galaxies as they fall in and orbit in the potential well of a Local Group (LG) analogue, following them with high cadence. The analysis is performed on eight disc satellite galaxies from the CIELO suite of hydrodynamical simulations. All galaxies have stellar masses within the range $[10^{8.1} - 10^{9.56}] M_{\sun} $h$^{-1}$. We measure tidal torques, ram pressure and specific star formation rates (sSFR) as a function of time, and correlate them with the amount of gas lost by satellites along their orbits. Stronger removal episodes occur when the disc plane is oriented perpendicular to the direction of motion. More than one peripassage is required to significantly modify the orientations of the discs with respect to the orbital plane. The gas removed during the interaction with the central galaxies may be also found opposite to the direction of motion, depending on the orbital configuration. Satellites are not totally quenched when the galaxies reach their first peripassage, and continue forming about $10\%$ of the final stellar mass after this event. The fraction of removed gas is found to be the product of the joint action of tidal torque and ram pressure, which can also trigger new star formation activity and subsequent supernova feedback.
description: 17 pages, 13 figures, accepted for publication in MNRAS
Barjols, atelier Fabre, fabrication du tambourin, tracé des trous dans le cercle à la pointe sèche et au jugé
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
Tidal dynamo in solar-like close binary stars
Creators: name: Wei, Xing
Publisher: name: arXiv
Year: 2022
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Thermal convection is commonly believed to be the energy source of stellar or planetary dynamo. In this short paper we provide another possibility, namely large-scale tidal flow. In close binary stars, say, solar-like stars with orbital period at 2 or 3 days, large-scale tidal flow is comparable to or even stronger than convective flow, and it can induce magnetic dynamo action. Based on dynamo equation and tidal theory we estimate the magnetic energy induced by large-scale tidal flow, which is proportional to the cube of orbital frequency. Our estimation can be tested by the future spectropolarimetric observations and numerical simulations for close binary stars.
Barjols, atelier Fabre, fabrication du tambourin, raclage et ponçage du cercle avec du papier de verre
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 influence of Hickson-like compact group environment on galaxy luminosities
Creators: name: Zandivarez, Ariel
name: Diaz-Gimenez, Eugenia
name: Taverna, Antonela
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Compact groups of galaxies are devised as extreme environments where interactions may drive galaxy evolution. In this work, we analysed whether the luminosities of galaxies inhabiting compact groups differ from those of galaxies in loose galaxy groups. We computed the luminosity functions of galaxy populations inhabiting a new sample of 1412 Hickson-like compact groups of galaxies identified in the Sloan Digital Sky Survey Data Release 16. We observed a characteristic absolute magnitude for galaxies in compact groups brighter than that observed in the field or loose galaxy systems. We also observed a deficiency of faint galaxies in compact groups in comparison with loose systems. Our analysis showed that the brightening is mainly due to galaxies inhabiting the more massive compact groups. In contrast to what is observed in loose systems where only the luminosities of Red (and Early) galaxies show a dependency with group mass, luminosities of Red and Blue (also Early and Late) galaxies in compact groups are affected similarly as a function of group virial mass. When using Hubble types, we observed that Elliptical galaxies in compact groups are the brightest galaxy population, and groups dominated by an Elliptical galaxy also display the brightest luminosities in comparison with those dominated by Spiral galaxies. Moreover, we show that the general luminosity trends can be reproduced using a mock catalogue obtained from a semi-analytical model of galaxy formation. These results suggest that the inner extreme environment in compact groups prompts a different evolutionary history for their galaxies.
description: 20 pages, 10 figures, 5 tables, accepted for publication in MNRAS
Selecting a complete sample of blazars in sub-millimetre catalogues
Creators: name: Massardi, M.
name: Bonato, M.
name: Lopez-Caniego, M.
name: Galluzzi, V.
name: De Zotti, G.
name: Bonavera, L.
name: Gonzalez-Nuevo, J.
name: Lapi, A.
name: Liuzzo, E.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The \textit{Herschel} Astrophysical Terahertz Large Area Survey (H-ATLAS), that has covered about 642 sq. deg. in 5 bands from 100 to 500 $μ\rm m$, allows a blind flux-limited selection of blazars at sub-mm wavelengths. However, blazars constitute a tiny fraction of H-ATLAS sources and therefore identifying them is not a trivial task. Using the data on known blazars detected by the H-ATLAS we have defined a locus for 500\,$μ$m selected blazars and exploited it to select blazar candidates in the H-ATLAS fields. Candidates and known blazars in the H-ATLAS equatorial and South Galactic Pole fields were followed up with the Australia Telescope Compact Array (ATCA) or with the Karl G. Jansky Very Large Array (VLA), and matched with existing radio- and mm-catalogues to reconstruct the spectral behaviour over at least 6 orders of magnitude in frequency. We identified a selection approach that, combining the information in the sub-mm and radio domains, efficiently singles out genuine blazars. In this way, we identified a sample of 39 blazars brighter than $S_{500μ\rm m} = 35\,$mJy in the H-ATLAS fields. Tests made cross-matching the H-ATLAS catalogues with large catalogues of blazar candidates indicate that the sample is complete. The derived counts are compared with model predictions finding good consistency with the C2Ex model and with estimates based on ALMA data.
description: 16 pages, 7 figures, accepted by MNRAS
A new galaxy spectral energy distribution model consistent with the evolution of dust
Creators: name: Nishida, Kazuki Y.
name: Takeuchi, Tsutomu T.
name: Nagata, Takuma
name: Asano, Ryosuke S.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The spectral energy distribution (SED) of galaxies provides fundamental information on the related physical processes. However, the SED is significantly affected by dust in its interstellar medium. Dust is mainly produced by asymptotic giant branch stars and Type II supernovae. In addition, the dust mass increases through the metal accretion, and the grain size changes by the collisions between the grains. The contribution of each process and the extinction depend on the size distribution. Therefore, the SED model should treat the evolution of the dust mass and size distribution. In spite of the importance of dust evolution, many previous SED models have not considered the evolution of the total mass and size distribution in a physically consistent manner. In this work, we constructed a new radiative transfer SED model, based on our dust evolution model consistent with the chemical evolution. To reduce the computational cost, we adopted the mega-grain and the one-dimensional plane parallel galaxy approximation. As a fiducial case, we calculated Milky Way-like galaxy SEDs at various ages under the closed-box model. We found that a galaxy at the age of 100~Myr does not produce small grains such as polycyclic aromatic hydrocarbons. After 1~Gyr, we observed a drastic increase of infrared emission and attenuation caused by a rapid increase of dust mass. This phenomenon can be treated appropriately for the first time by our new model. This model can be used for the SED fitting to a galaxy at any stage of evolution.
description: 19 Pages, 19 Figures, accepted for publication in MNRAS
Software Updates Strategies: a Quantitative Evaluation against Advanced Persistent Threats
Creators: name: Di Tizio, Giorgio
name: Armellini, Michele
name: Massacci, Fabio
Publisher: name: arXiv
Year: 2022
Subjects: subject: Cryptography and Security (cs.CR)
subject: FOS: Computer and information sciences

description: Software updates reduce the opportunity for exploitation. However, since updates can also introduce breaking changes, enterprises face the problem of balancing the need to secure software with updates with the need to support operations. We propose a methodology to quantitatively investigate the effectiveness of software updates strategies against attacks of Advanced Persistent Threats (APTs). We consider strategies where the vendor updates are the only limiting factors to cases in which enterprises delay updates from 1 to 7 months based on SANS data. Our manually curated dataset of APT attacks covers 86 APTs and 350 campaigns from 2008 to 2020. It includes information about attack vectors, exploited vulnerabilities (e.g. 0-days vs public vulnerabilities), and affected software and versions. Contrary to common belief, most APT campaigns employed publicly known vulnerabilities. If an enterprise could theoretically update as soon as an update is released, it would face lower odds of being compromised than those waiting one (4.9x) or three (9.1x) months. However, if attacked, it could still be compromised from 14% to 33% of the times. As in practice enterprises must do regression testing before applying an update, our major finding is that one could perform 12% of all possible updates restricting oneself only to versions fixing publicly known vulnerabilities without significant changes to the odds of being compromised compared to a company that updates for all versions.
A revised simplified scattering model for the moonlit sky brightness profile based on photometry at SAAO
Creators: name: Winkler, Hartmut
Publisher: name: arXiv
Year: 2022
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: This paper presents multi-filter measurements of the night sky brightness at the South African Astronomical Observatory (SAAO) in Sutherland in the presence of a bright moon. The observations cover a wide range of sky directions, lunar phases and lunar positions. A revised simplified scattering model is developed for estimating the sky brightness due to moonlight that more accurately reflects the atmospheric extinction of the lunar beam compared to models frequently applied in astronomical studies. Contributions to night sky brightness due to sources other than moonlight are quantified and subtracted from the total sky background radiation to determine the spectral intensity and angular distribution of scattered moonlight. The atmospheric scattering phase function is then derived by comparing the sky brightening to the strength of the incoming lunar beam, estimated using a novel approach. The phase function is shown to be an excellent match to the combined theoretical Rayleigh and Mie scattering functions, the latter with a Henyey--Greenstein form instead of the exponential angular relationship often used in previous studies. Where deviations between measured and model sky brightness are evident in some bands these are explained by contributions from multiple scattering or airglow, and are quantified accordingly. The model constitutes an effective tool to predict sky brightness at SAAO in optical photometric bands, especially with a bright moon present. The methodology can also be readily be adapted for use at other astronomical sites. The paper furthermore presents $UBV(RI)_c$ and Str{ö}mgren photometry for 49 stars, most with no prior such data.
description: Accepted for publication in Monthly Notices of the Royal Astronomical Society
The initial conditions for young massive cluster formation in the Galactic Centre: convergence of large-scale gas flows
Creators: name: Williams, Bethan A.
name: Walker, Daniel L.
name: Longmore, Steven N.
name: Barnes, A. T.
name: Battersby, Cara
name: Garay, Guido
name: Ginsburg, Adam
name: Gomez, Laura
name: Henshaw, Jonathan D.
name: Ho, Luis C.
name: Kruijssen, J. M. Diederik
name: Lu, Xing
name: Mills, Elisabeth A. C.
name: Petkova, Maya A.
name: Zhang, Qizhou
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: Young massive clusters (YMCs) are compact ($\lesssim$1 pc), high-mass (>10${}^4$ M${}_{\odot}$) stellar systems of significant scientific interest. Due to their rarity and rapid formation, we have very few examples of YMC progenitor gas clouds before star formation has begun. As a result, the initial conditions required for YMC formation are uncertain. We present high-resolution (0.13$^{\prime\prime}$, $\sim$1000 au) ALMA observations and Mopra single-dish data, showing that Galactic Centre dust ridge `Cloud d' (G0.412$+$0.052, mass$\sim 7.6 \times 10^4$ M$_{\odot}$, radius$\sim 3.2$ pc) has the potential to become an Arches-like YMC (10$^4$ M$_{\odot}$, r$\sim$1 pc), but is not yet forming stars. This would mean it is the youngest known pre-star forming massive cluster and therefore could be an ideal laboratory for studying the initial conditions of YMC formation. We find 96 sources in the dust continuum, with masses $\lesssim$3 M$_{\odot}$ and radii of $\sim$10${}^3$ au. The source masses and separations are more consistent with thermal rather than turbulent fragmentation. It is not possible to unambiguously determine the dynamical state of most of the sources, as the uncertainty on virial parameter estimates is large. We find evidence for large-scale ($\sim$1 pc) converging gas flows, which could cause the cloud to grow rapidly, gaining 10$^4$ M$_{\odot}$ within 10$^5$ yr. The highest density gas is found at the convergent point of the large-scale flows. We expect this cloud to form many high-mass stars, but find no high-mass starless cores. If the sources represent the initial conditions for star formation, the resulting IMF will be bottom-heavy.
The lively accretion disk in NGC 2992. II. The 2019/2021 X-ray monitoring campaigns
Creators: name: Middei, R.
name: Marinucci, A.
name: Braito, V.
name: Bianchi, S.
name: De Marco, B.
name: Luminari, A.
name: Matt, G.
name: Nardini, E.
name: Perri, M.
name: Reeves, J. N.
name: Vagnetti, F.
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We report on the short and long term X-ray properties of the bright nearby Seyfert 2 galaxy NGC 2992, which was extensively observed with Swift, XMM-Newton and NuSTAR. Swift targeted the source more than 100 times between 2019 and 2021 in the context of two monitoring campaigns. Both time-averaged and time-resolved analyses are performed, and we find that the short-to-long term spectral properties of NGC 2992 are dominated by a highly variable nuclear continuum. The source varied in the 2-10 keV energy band from 0.6 to 12 $\times$ 10$^{-11}$ erg cm$^{-2}$ s$^{-1}$ during the two year long Swift monitoring. The fastest 2-10 keV flux change (by a factor of $\sim60\%$) occurred on a timescale of a few hours. The overall emission spectrum of the source is consistent with a power law-like continuum ($Γ=1.69\pm0.01$) absorbed by a constant line-of-sight column density N$_{H}=(7.8\pm0.1)\times$ 10$^{21}$ $\rm cm^{-2}$. The reflected emission is likely due to matter with an average column density N$_{\rm H}=(9.6\pm2.7)\times$ 10$^{22}$ $\rm cm^{-2}$, thus NGC 2992 appears to have a globally Compton-thin circumnuclear medium. This scenario is fully supported by an independent analysis of the fractional variability and by XMM-Newton multi-year spectra.
description: 21 pages, 17 figures. Accepted for publication in MNRAS
The Cosmic Large-Scale Structure in X-rays (CLASSIX) cluster survey IV: Superclusters in the local Universe at z <= 0.03
Creators: name: Boehringer, Hans
name: Chon, Gayoung
Publisher: name: arXiv
Year: 2022
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: It is important to map the large-scale matter distribution in the local Universe for cosmological studies, such as the tracing of the large-scale peculiar velocity flow, the characterisation of the environment for different astronomical objects, and for precision measurements of cosmological parameters. We used X-ray luminous clusters to map this matter distribution and find that about 51% of the groups and clusters are members of superclusters which occupy only a few percent of the volume. In this paper we provide a detailed description of these large-scale structures. With a friends-to-friends algorithm, we find eight superclusters with a cluster overdensity ratio of at least two with five or more galaxy group and cluster members in the cosmic volume out to z = 0.03. The four most prominent ones are the Perseus-Pisces, the Centaurus, the Coma, and the Hercules supercluster, with lengths from about 40 to over 100 Mpc and estimated masses of 0.6 - 2.2 10^16 Msun. The largest of these structures is the Perseus-Pisces supercluster. The four smaller superclusters include the Local and the Abell 400 supercluster and two superclusters in the constellations Sagittarius and Lacerta. We provide detailed maps, member catalogues, and physical descriptions of the eight superclusters. By constructing superclusters with a range of cluster sub-samples with different lower X-ray luminosity limits, we show that the main structures are always reliably recovered.
description: Published in Astronomy and Astrophysics, 31 pages, 28 figures
O PAPEL DA ENFERMAGEM NA PREVENÇÃO E TRATAMENTO DA CANDIDÍASE NA GESTAÇÃO: DESAFIOS E ESTRATEGIAS PARA A SAÚDE MATERNO-INFANTIL
Creators: name: Eduarda Ramos SOUZA
name: Kaline Ribeiro FIGUEIREDO
name: Jaqueline Rodrigues da SILVA
Publisher: name: Zenodo
Year: 2025
Subjects: Cuidados da enfermagem
Candidíase vaginal
Gestação
Saúde Materna e neonatal
Prevenção e controle

description: RESUMO

 

A candidíase vaginal é uma infecção que acomete as mulheres gravidas, provocada por fungos do gênero Candida spp. Durante a gravidez, as mudanças hormonais e imunológicas aumentam a susceptibilidade, o que pode influir na saúde tanto da mãe quanto do feto. O papel dos profissionais de enfermagem na prevenção e no tratamento da candidíase gestacional é crucial, pois possibilita oferecer às gestantes educação em saúde, diagnóstico precoce e acompanhamento continuo, tendo como objetivo avaliar a atuação da enfermagem na prevenção, identificação e tratamento da candidíase durante a gravidez, considerando os principais obstáculos enfrentados e as abordagens que podem ser aplicadas para melhorar a saúde materno-infantil, abordando uma metodologia de revisão qualitativa da literatura, a partir de artigos acadêmicos e orientações de saúde pública, com o intuito de identificar as práticas de enfermagem voltadas à prevenção e ao tratamento da candidíase em gestantes. A pesquisa abrangeu estudos publicados nos últimos sete anos e incluiu diversas fontes, como periódicos especializados, livros e diretrizes de entidades como a Organização Mundial da Saúde (OMS) e o Ministério da Saúde, portanto conclui-se que este estudo se obteve como resultado os achados demonstrados referentes a enfermagem como ela é vital para sensibilizar as gestantes em relação a cuidados preventivos, como a correta higiene intima e o uso prudente de medicamentos adequados. Além disso, os enfermeiros têm um papel fundamental na detecção precoce dos sintomas da candidíase, no direcionamento para um tratamento adequado e na orientação sobrea relevância de completar o tratamento para evitar complicações, como o parto prematuro e o risco de infecção para recém-nascido. O estuda acima trabalhado conclui-se que a atuação da enfermagem na prevenção e tratamento da candidíase durante a gravidez é essencial para a promoção da saúde materno- infantil. Contudo, desafios como a falta de formação continuada e a escassez de recursos em algumas unidades de saúde precisam ser enfrentados. A adoção de estratégias educativas e a colaboração entre os profissionais de saúde podem melhorar consideravelmente o atendimento às gestantes, reduzindo os efeitos da candidíase e promovendo melhores resultados para as mães e bebês.
Dr Abdou Saïdou, Patrimoine culturel immatériel des Mambay au Cameroun
Creators: name: Saïdou, Abdou
Publisher: name: figshare
Year: 2024
Subjects: classificationCode: 470501
subject: African literature
classificationCode: 470507
subject: Comparative and transnational literature
classificationCode: 470508
subject: Digital literature
classificationCode: 470514
subject: Literary theory

description: Dr Abdou Saïdou, Patrimoine culturel immatériel des Mambay au Cameroun
How catastrophic can catastrophic forgetting be in linear regression?
Creators: name: Evron, Itay
name: Moroshko, Edward
name: Ward, Rachel
name: Srebro, Nati
name: Soudry, Daniel
Publisher: name: arXiv
Year: 2022
Subjects: subject: Machine Learning (cs.LG)
subject: Numerical Analysis (math.NA)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics

description: To better understand catastrophic forgetting, we study fitting an overparameterized linear model to a sequence of tasks with different input distributions. We analyze how much the model forgets the true labels of earlier tasks after training on subsequent tasks, obtaining exact expressions and bounds. We establish connections between continual learning in the linear setting and two other research areas: alternating projections and the Kaczmarz method. In specific settings, we highlight differences between forgetting and convergence to the offline solution as studied in those areas. In particular, when T tasks in d dimensions are presented cyclically for k iterations, we prove an upper bound of T^2 * min{1/sqrt(k), d/k} on the forgetting. This stands in contrast to the convergence to the offline solution, which can be arbitrarily slow according to existing alternating projection results. We further show that the T^2 factor can be lifted when tasks are presented in a random ordering.
CP Rail news
Creators: name: Canadian Pacific Railway Company. Public Relations & Advertising
Publisher: name: Montreal : Canadian Pacific Public Relations & Advertising
Year: 2017

description: CP Rail News Vol. 8 Number 3 (11 Oct. 1978), Vol. 8 Number 15 (22 Nov. 1978, two copies), Vol. 10 Number 3 (27 Feb. 1980, two copies), Vol. 10 Number 5 (16 Apr. 1980, two copies), Vol. 10 Number 6 (14 May 1980, three copies), Vol. 10 Number 7 (28 May 1980, two copies), Vol. 11 Number 15 (18 Nov. 1981, two copies), Vol. 12 Number 1 (13 Jan. 1982), Vol. 12 Number 2 (3 Feb. 1982), Vol. 12 Number 5 (14 Apr. 1982), Vol. 12 Number 6 (5 May 1982), Vol. 12 Number 14 (27 Oct. 1982), Vol. 12 Number 16 (6 Dec. 1982), Vol. 13 Number 1 (5 Jan. 1983) and Vol. 13 Number2 (26 Jan. 1983).
Democratising Agricultural Commodity Price Forecasting: The AGRICAF Approach
Creators: name: Zelingher, Rotem
Publisher: name: Unknown
Year: 2025
Subjects: subject: Demand and Price Analysis
subject: Food Consumption/Nutrition/Food Safety
subject: International Relations/Trade
subject: Teaching/Communication/Extension/Profession
subject: Food-security
subject: Agricultural Commodity Trade
subject: Price Forecasting
subject: Forecasting for Social Good
subject: Explainable Machine Learning

description: Ensuring food security is a global challenge, particularly in low-income countries where food prices affect access to nutritious food. The instability of global agricultural commodity (AC) prices exacerbates food insecurity, with international trade restrictions and market disruptions further complicating the situation. Although online platforms exist for monitoring food prices, there is still a need for accessible, detailed forecasts for non-specialists. This paper proposes the Agricultural Commodity Analysis and Forecasts (AGRICAF) methodology, integrating explainable machine learning (XML) and econometric techniques to analyse and forecast global ACs prices up to one year ahead across different horizons. This innovative integration allows us to model complex interactions while providing clear, interpretable results. We demonstrate the utilization of AGRICAF, applying it to three major commodities and explaining how different factors impact prices across months and forecast horizons. By facilitating access to reliable forecasts of AC prices, AGRICAF can advance a fairer and sustainable food system.
Puget Sound recreational shellfishing survey : methodology and results.
Creators: name: Anderson, Leif, 1979-
Publisher: name: U.S. Department of Commerce, National Oceanic and Atmospheric Administration, National Marine Fisheries Service, Northwest Fisheries Science Center
Year: 2016
Subjects: subject: Fishers--Washington (State)--Puget Sound--Interviews.

description: The Puget Sound Recreational Shellfishing Survey was administered in 2013 by the Northwest Fisheries Science Center to enable the estimation of changes in economic value associated with biotoxin- and pollution-related clam and oyster harvest closures in Puget Sound, Washington. In particular, data were collected in order to estimate econometric models of recreational demand. This Technical Memorandum describes the methodology used to administer the survey and some of the basic findings, including characteristics of harvest trips and harvester preferences, expenditures, and demographics. The survey was administered by mail, but included a telephone screener to identify license holders who had actively harvested clams or oysters in Puget Sound within the previous 12 months. Answers from this short telephone screener were also compared to answers from the mail survey to identify potential nonresponse bias. We found very little evidence of differences between respondents to the telephone screener and those who completed the mail survey. Clam and oyster harvesting in Puget Sound appears to be a regular, important recreational activity for many respondents. Respondents reported an average of 3.7 and 2.4 days harvesting clams and oysters, respectively. These harvesting days translated into a significant number of meals, as more than half of the respondents consumed at least four meals per year containing their harvest, with 18% consuming more than ten meals per year. Only 30% of Puget Sound clam and oyster harvesters also harvested razor clams on ocean beaches. Respondents also indicated that they would continue to take harvesting trips in the future, with more than half stating they would definitely harvest within the next 12 months and only 1% indicating that they would definitely not harvest. Most harvesters (64%) tended to use a single beach exclusively. Even harvesters who used more than one beach tended to use beaches that were in close proximity to one another. This suggests a unique importance at the individual harvester level for individual beaches, and clusters of beaches, across Puget Sound. These data provide shellfish managers with useful information about current harvesters. Future work will use these data to estimate models of recreational demand, in order to estimate the changes in economic value that result from changes in harvest closures.
A cross-cultural investigation of schizotypy, empathy, and interpersonal pleasure
Creators: name: Blain, Scott D.
name: Zidong Zhao
name: Chan, Raymond
name: Sohee Park
Publisher: name: F1000Research
Year: 2016

description: Elevated schizotypy is associated with impairments in social-emotion functioning. Social behavior, in turn, is influenced by culture. However, very little is known about the impact of culture on schizotypy, empathy and interpersonal pleasure. 82 American and 54 Chinese age-matched participants completed questionnaires to assess schizotypy, cognitive/affective empathy, and interpersonal pleasure. There were cross-cultural differences in schizotypy, empathy, and interpersonal pleasure. There were also gender differences in schizotypy, interpersonal pleasure, and empathy. Chinese participants and males had lower levels of empathy and interpersonal pleasure. Schizotypy was negatively correlated with interpersonal pleasure, as well as cognitive but not affective empathy; correlations were driven by negative-schizotypy. Regression analyses using gender, schizotypy, and culture to predict empathy revealed schizotypy and culture (but not gender) as significant predictors. There may be cultural differences in schizotypy and measures of interpersonal social functioning, which should be considered in both research and clinical contexts. The results of our study underscore the importance of culture and gender effects in psychopathology and social functioning.
Expression data integration in an Aspergillus niger genome-scale metabolic model
Creators: name: Aguilar-Pontes, Maria Victoria
name: Brandl, Julian
name: Tsang, Adrian
name: Andersen, Mikael R.
name: Vries, Ronald P. De
Publisher: name: F1000Research
Year: 2016

description: Filamentous fungi include important species used in industrial applications. One of the main representatives is Aspergillus niger, an industrial workhorse used for enzyme and metabolite production. In order to achieve its full potential, deeper knowledge of the metabolism is needed. We propose a new metabolic network, improving the previous version of Andersen et al., based on literature and transcriptome data. This network will be used as a model to predict A. niger intracellular carbon metabolic fluxes during growth under different conditions.