cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Evidence of ram pressure stripping of WLM, a dwarf galaxy far away from any large host galaxy
Creators: name: Yang, Yanbin
name: Ianjamasimanana, Roger
name: Hammer, Francois
name: Higgs, Clare
name: Namumba, Brenda
name: Carignan, Claude
name: Józsa, Gyula I. G.
name: McConnachie, Alan W.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Dwarf galaxies are affected by all the evolutionary processes normally at work in galaxies of any mass. As fainter and less massive galaxies, however, dwarf galaxies are particularly susceptible to environmental mechanisms that can more easily perturb these systems. Importantly, the presence of nearby large galaxies are expected to have a profound effect on dwarf galaxies. Gravitational (especially tidally-induced) effects from the large galaxy can cause mass to be lost from the dwarf, and the passage of the dwarf through the gaseous medium surrounding the large galaxy can additionally cause the dwarf to lose its own gas through a process called ram pressure stripping. Such effects are considered to be the main sources of difference between "satellite" and "field" dwarf galaxy populations. Here, we report on new observations of the gaseous content of Wolf-Lundmark-Melotte (WLM), an archetype of isolated, gas-rich field dwarf galaxies in the Local Universe, which shows a much more complex situation. Previous studies of its gaseous disk suggest it has perturbed kinematics; here, we identify four trailing, extended gas clouds in the opposite direction to WLM's spatial motion, as well as a spatial offset between the WLM gas and stars. Overall, the morphology and kinematics of this gas shows that WLM is undergoing ram pressure stripping, despite being 930 and 830 kpc from the Milky Way and M31, respectively. This finding indicates the presence of an inter-galactic, gaseous reservoir far from large galaxies whose evolutionary role on galaxies, both large and small, may not be fully appreciated.
description: 7 pages, 7 Figures, accepted as a Letter by Astronomy Astrophysics, March 28 2022, including proofs from the Journal
University Engagement as Interconnectedness: Indicators and Insights
Creators: name: Schalkwyk, Francois Van
Publisher: name: figshare
Year: 2014
Subjects: Education

description: This report outlines research conducted in the second phase of the Higher Education Advocacy Network in Africa Research and Advocacy in Africa (HERANA) project of the Centre for Higher Education Transformation (CHET).
The research focused on devising indicators on university–community engagement by conceptualising engagement as ‘interconnectedness’. Interconnectedness describes the relationship (in tension) of academics engaging with those outside of the university while simultaneously linking back to the university. Interconnectedness is operationalised along two dimensions: (1) ‘articulation’ which describes the extent to which engagement activities link to the university’s strategic objectives and to external constituents in a sustainable manner, and (2) the ‘academic core’ which describes the extent to which engagement activities link to the university’s core functions of research and teaching and learning.
Broadly speaking, the study aimed to develop a deeper understanding of the tension inherent in university engagement activities and, in particular, how these activities impact on the university as key knowledge producer. The study found that it is possible to develop a set of indicators to assess the extent to which university engagement activities are articulated and strengthening the core functions of universities. The concept of interconnectedness provides a useful framework for operationalising research on engagement activities, and the indicators and their graphical representation provide a useful tool for identifying patterns, and for revealing and confirming informative dimensions of university–community engagement activities.
The study suggests that engagement between university academics and those external to the university is active. The nature of this engagement, however, varies considerably and, more portentously, based on the findings of this study, the degree to which such engagement activities can be said to be strengthening the university as key knowledge producing institution is uneven and too frequently marginal.
Universality of political corruption networks
Creators: name: Martins, Alvaro F.
name: da Cunha, Bruno R.
name: Hanley, Quentin S.
name: Goncalves, Sebastian
name: Perc, Matjaz
name: Ribeiro, Haroldo V.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Corruption crimes demand highly coordinated actions among criminal agents to succeed. But research dedicated to corruption networks is still in its infancy and indeed little is known about the properties of these networks. Here we present a comprehensive investigation of corruption networks related to political scandals in Spain and Brazil over nearly three decades. We show that corruption networks of both countries share universal structural and dynamical properties, including similar degree distributions, clustering and assortativity coefficients, modular structure, and a growth process that is marked by the coalescence of network components due to a few recidivist criminals. We propose a simple model that not only reproduces these empirical properties but reveals also that corruption networks operate near a critical recidivism rate below which the network is entirely fragmented and above which it is overly connected. Our research thus indicates that actions focused on decreasing corruption recidivism may substantially mitigate this type of organized crime.
description: 11 pages, 6 figures, supplementary information; accepted for publication in Scientific Reports
Decoding the star forming properties of gas-rich galaxy pairs
Creators: name: Bok, Jamie
name: Cluver, Michelle E.
name: Jarrett, Thomas H.
name: Skelton, Rosalind E.
name: Jones, Michael G.
name: Verdes-Montenegro, Lourdes
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We extend the analysis of Bok et al. (2020) in which the HI content of isolated galaxies from the AMIGA sample and selected paired galaxies from ALFALFA were examined as a potential driver of galaxy location on the WISE mid-infrared SFR-Mstar sequence. By further characterizing the isolated and pair galaxy samples, i.e. in terms of optical galaxy morphology, a more detailed and quantitative description of local galaxy environment by way of the local number density (eta) and tidal strength (Q) parameters, star formation efficiency (SFE(HI)), and HI integrated profile asymmetries, we present plausible pathways for the broadening of the pair sample HI deficiency distribution towards both high and low deficiencies compared to the narrower isolated galaxy sample distribution (i.e. sigma_pairs = 0.34 versus sigma_AMIGA = 0.28). We associate the gas-rich tail of the pair deficiency distribution with the highest Q values, large profile asymmetries, and low SFEs. From this we infer that merger activity is enhancing gas supplies, as well as disrupting the efficiency of star formation, via strong gravitational torques. The gas-poor wing of the deficiency distribution appears to be populated with galaxies in denser environments (with larger eta values on average), more akin to groups. Despite our gas-rich selection criterion, there is a small population of early-type galaxies in the pair sample, which primarily fall in the positive deficiency wing of the distribution. These results suggest that a combination of a denser galaxy environment, early-type morphology, and higher stellar mass, is contributing to the broadening of the deficiency distribution towards larger deficiencies.
RNA imaging in living cells – methods and applications
Creators: name: Urbanek, Martyna O
name: Galka-Marciniak, Paulina
name: Olejniczak, Marta
name: Wlodzimierz J Krzyzosiak
Publisher: name: Taylor & Francis
Year: 2015
Subjects: subject: 60506 Virology
subject: FOS: Biological sciences
subject: Hematology
subject: Developmental Biology
subject: Information and Computing Sciences
subject: Biological Sciences
subject: Molecular Biology
subject: Genetics
subject: Cell Biology
subject: Physics
subject: Biochemistry
subject: Biophysics

description: Numerous types of transcripts perform multiple functions in cells, and these functions are mainly facilitated by the interactions of the RNA with various proteins and other RNAs. Insight into the dynamics of RNA biosynthesis, processing and cellular activities is highly desirable because this knowledge will deepen our understanding of cell physiology and help explain the mechanisms of RNA-mediated pathologies. In this review, we discuss the live RNA imaging systems that have been developed to date. We highlight information on the design of these systems, briefly discuss their advantages and limitations and provide examples of their numerous applications in various organisms and cell types. We present a detailed examination of one application of RNA imaging systems: this application aims to explain the role of mutant transcripts in human disease pathogenesis caused by triplet repeat expansions. Thus, this review introduces live RNA imaging systems and provides a glimpse into their various applications.
Evaluation of the preceptorship model of supervision for 3rd year nursing and midwifery students
Creators: name: Yangama Jokwiro
name: Ramsden, Penny
name: Smitha Varghese
name: Hurren, Gabrielle
name: Hansen, Leah
name: Skec, Candice
name: McLeod, Carmel
Publisher: name: La Trobe
Year: 2021
Subjects: Uncategorized

description: No description supplied
The evolution of the high-frequency variability in the black hole candidate GRS 1915+105 as seen by RXTE
Creators: name: Zhang, Yuexin
name: Méndez, Mariano
name: García, Federico
name: Karpouzas, Konstantinos
name: Zhang, Liang
name: Liu, Honghui
name: Belloni, Tomaso M.
name: Altamirano, Diego
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: GRS 1915+105 can show type-C quasi-periodic oscillations (QPOs) in the power density spectrum. A high-frequency QPO (HFQPO) at 67 Hz has been observed in this source, albeit less often than the type-C QPOs. Besides these features, GRS 1915+105 sometimes shows a broad bump in the power spectrum at around 30-150 Hz. We study the power spectra of GRS 1915+105 with the Rossi X-ray Timing Explorer when the source was in the $χ$ class. We find that the rms amplitude of the bump depends strongly upon both the frequency of the type-C QPO and the hardness ratio, and is correlated with the corona temperature and anti-correlated with the radio flux at 15 GHz. The characteristic frequency of the bump is better correlated with a combination of the frequency of the type-C QPO and the hardness ratio than with the frequency of the type-C QPO alone. The rms amplitude of the bump generally increases with energy from ~1-2% at ~3 keV to ~10-15% at ~30 keV. We suggest that the bump and the high-frequency QPO may be the same variability component but the properties of the corona affect the coherence of this variability, leading either to a HFQPO when the spectrum is in the relatively soft $γ$ class, or to a bump when the spectrum is in the hard $χ$ class. Finally, we discuss the anti-correlation between the rms amplitude of the bump and the radio flux in the context of the relation between the corona and the jet.
description: 11 pages, 7 figures, accepted for publication in MNRAS
Development of a Volunteer Simulated Patient Program to strengthen and sustain simulation education programs for students and staff.
Creators: name: Yangama Jokwiro
name: Drew, Aras
name: Baldac, Stacey
name: Griffiths, Leonie
name: Mason, Todd
Publisher: name: La Trobe
Year: 2021
Subjects: Uncategorized

description: No description supplied
title: Film Production in Francophone Africa 1961 to 1977: Ousmane Sembene -- An Exception
title: Film Production in Francophone Africa 1961 to 1977
titleType: AlternativeTitle
Creators: name: Andrade-Watkins, Claire
Publisher: name: University of Massachusetts Amherst
Year: 1993
Subjects: subject: French Colonialism Film African Independence

description: The advent of independence throughout francophone Africa in 1960 ushered in an era of transition for France and her former colonies. France provided development assistance and technical expertise to former francophone African colonies through the Ministry of Cooperation, created expressly for the newly independent countries. In cinema, financial and technical assistance was provided on two levels: The Consortium Audiovisuel International (CAl), the private sector ann of the Ministry of Cooperation established in 1961, produced newsreels, educational documentaries, and other special projects for the former colonies; theBureau du Cinema (Film Bureau),on the other hand, provided financial and technical assistance to African fIlmmakers.
The contribution of non-central radio galaxies to AGN feedback in rich galaxy clusters
Creators: name: Seth, Ruchika
name: O'Sullivan, Ewan
name: Sebastian, Biny
name: Raychaudhury, Somak
name: Schellenberger, Gerrit
name: Haines, Christopher P.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We present a combined radio/X-ray study of six massive galaxy clusters, aimed at determining the potential for heating of the intra-cluster medium (ICM) by non-central radio galaxies. Since X-ray cavities associated with the radio lobes of non-central galaxies are generally not detectable, we use Giant Metrewave Radio Telescope 610~MHz observations to identify jet sources and estimate their size, and Chandra data to estimate the pressure of the surrounding ICM. In the radio, we detect 4.5% of galaxies above the spectroscopic survey limit (M*K+2.0) of the Arizona cluster redshift survey (ACReS) which covers five of our six clusters. Approximately one tenth of these are extended radio sources. Using star formation (SF) rates determined from mid-infrared data, we estimate the expected contribution to radio luminosity from the stellar population of each galaxy, and find that most of the unresolved or poorly-resolved radio sources are likely star formation dominated. The relatively low frequency and good spatial resolution of our radio data allows us to trace star formation emission down to galaxies of stellar mass ~10^9.5 Msol. We estimate the enthalpy of the (AGN dominated) jet/lobe and tailed sources, and place limits on the energy available from unresolved radio jets. We find jet powers in the range ~10^43-10^46 erg/s, comparable to those of brightest cluster galaxies. Our results suggest that while cluster-central sources are the dominant factor balancing ICM cooling over the long term, non-central sources may have a significant impact, and that further investigation is possible and warranted.
description: Accepted for publication in MNRAS, 17 pages + 8 pages of appendices
Primordial Gravitational Waves Predictions for GW170817-compatible Einstein-Gauss-Bonnet Theory
Creators: name: Oikonomou, V. K.
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: In this work we shall calculate in detail the effect of an GW170817-compatible Einstein-Gauss-Bonnet theory on the energy spectrum of the primordial gravitational waves. The spectrum is affected by two characteristics, the overall amplification/damping factor caused by the GW170817-compatible Einstein-Gauss-Bonnet theory and by the tensor spectral index and the tensor-to-scalar ratio. We shall present the formalism for studying the inflationary dynamics and post-inflationary dynamics of GW170817-compatible Einstein-Gauss-Bonnet theories for all redshifts starting from the radiation era up to the dark energy era. We exemplify our formalism by using two characteristic models, which produce viable inflationary and dark energy eras. As we demonstrate, remarkably the overall damping/amplification factor is of the order of unity, thus the GW170817-compatible Einstein-Gauss-Bonnet models affect the primordial gravitational waves energy spectrum only via their tensor spectral index and the tensor-to-scalar ratio. Both models have a blue tilted tensor spectrum, and therefore the predicted energy spectrum of the primordial gravity waves can be detectable by most of the future gravitational waves experiments, for various reheating temperatures.
description: Accepted in Astroparticle Physics
Revisiting the relation between the number of globular clusters and galaxy mass for low mass galaxies
Creators: name: Zaritsky, Dennis
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Using a new method to estimate total galaxy mass (M$_{\rm T}$) and two samples of low luminosity galaxies containing measurements of the number of globular clusters (GCs) per galaxy (N$_{\rm GC}$), we revisit the N$_{\rm GC}-$M$_{\rm T}$ relation using a total of 203 galaxies, 157 of which have M$_{\rm T}$ $\ \le 10^{10}$ M$_\odot$. We find that the relation is nearly linear, N$_{\rm GC} \propto$ M$_{\rm T}^{0.92\pm0.08}$ down to at least M$_{\rm T} \sim 10^{8.75}$ M$_\odot$. Because the relationship extends to galaxies that average less than one GC per galaxy and to a mass range in which mergers are relatively rare, the relationship cannot be solely an emergent property of hierarchical galaxy formation. The character of the radial GC distribution in low mass galaxies, and the lack of mergers at these galaxy masses, also appears to challenge models in which the GCs form in central, dissipatively concentrated high-density, high-pressure regions and are then scattered to large radius. The slight difference between the fitted power-law exponent and a value of one, leaves room for a shallow M$_{\rm T}$-dependent variation in the mean mass per GC that would allow the relation between total mass in GCs and M$_{\rm T}$ to be linear.
description: Accepted for publication in MNRAS (6 pages, 3 figures)
Discovery and analysis of three magnetic hot subdwarf stars: evidence for merger-induced magnetic fields
Creators: name: Pelisoli, Ingrid
name: Dorsch, M.
name: Heber, U.
name: Gänsicke, B.
name: Geier, S.
name: Kupfer, T.
name: Németh, P.
name: Scaringi, S.
name: Schaffenroth, V.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Magnetic fields can play an important role in stellar evolution. Among white dwarfs, the most common stellar remnant, the fraction of magnetic systems is more than 20 per cent. The origin of magnetic fields in white dwarfs, which show strengths ranging from 40 kG to hundreds of MG, is still a topic of debate. In contrast, only one magnetic hot subdwarf star has been identified out of thousands of known systems. Hot subdwarfs are formed from binary interaction, a process often associated with the generation of magnetic fields, and will evolve to become white dwarfs, which makes the lack of detected magnetic hot subdwarfs a puzzling phenomenon. Here we report the discovery of three new magnetic hot subdwarfs with field strengths in the range 300-500 kG. Like the only previously known system, they are all helium-rich O-type stars (He-sdOs). We analysed multiple archival spectra of the three systems and derived their stellar properties. We find that they all lack radial velocity variability, suggesting formation via a merger channel. However, we derive higher than typical hydrogen abundances for their spectral type, which are in disagreement with current model predictions. Our findings suggest a lower limit to the magnetic fraction of hot subdwarfs of 0.147 (+0.143/-0.047) per cent, and provide evidence for merger-induced magnetic fields which could explain white dwarfs with field strengths of 50-150 MG, assuming magnetic flux conservation.
description: 17 pages, 14 figures. Accepted for publication in MNRAS
Having the best of both worlds: nursing students’ perceptions of the Preceptorship Model of clinical supervision within a hospital based nursing clinical school.
Creators: name: McLeod, Carmel
name: A Maberly
name: Yangama Jokwiro
name: Edvardsson, David
Publisher: name: La Trobe
Year: 2021
Subjects: Uncategorized

description: No description supplied
Lags of the KiloHertz Quasi-Periodic Oscillations in the transient source XTE J1701$-$462
Creators: name: Peirano, Valentina
name: Méndez, Mariano
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We analysed 14 observations with kilohertz quasi-periodic oscillations (kHz QPOs) of the neutron star X-ray binary XTE J1701$-$462, the first source to show a clear transition between atoll and Z-like behaviour during a single outburst. We calculated the average cross-spectrum of both atoll and Z-phase observations of XTE J1701$-$462 between a reference/hard band (6.1 - 25.7 keV) and a subject/soft band (2.1 - 5.7 keV) to obtain, using a novel technique, the average time lags of the lower and upper kHz QPOs. During the atoll phase, we found that at the frequency of the lower kHz QPO the soft photons lag behind the hard ones by $18 \pm 8$ $μ$s, whereas during the Z phase the lags are $33\pm35$ $μ$s, consistent with zero. This difference in the lags of both phases suggests that in XTE J1701$-$462, as observed in other sources, the lags decrease with increasing luminosity. We found that for both the atoll and Z phase observations the fractional rms amplitude increases with energy up to $\sim$10 keV and remains more or less constant at higher energies. Since these changes in the variability of XTE J1701$-$462 occur within the same outburst, properties like the mass of the neutron star or the inclination of the system cannot be responsible for the differences in the timing properties of the kHz QPOs in the atoll and Z phase. Here we suggest that these differences are driven by a Comptonizing component or corona, possibly oscillating in a coupled mode with the innermost regions of the accretion disc.
description: 11 pages, 5 figures, accepted for publication in MNRAS
Electronic structure and magnetism of the Hund insulator CrI3
Creators: name: Yu, Tianye
name: Liu, Rui
name: Mao, Huican
name: Ma, Xiaobo
name: Wang, Guangwei
name: Yuan, Zhihong
name: Zheng, Pengyu
name: Peng, Yiran
name: Yin, Zhiping
Publisher: name: arXiv
Year: 2022
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: CrI3 is a two-dimensional ferromagnetic van der Waals material with a charge gap of 1.1-1.2 eV. In this study, the electronic structure and magnetism of CrI3 are investigated by using density functional theory and dynamical mean-field theory. Our calculations successfully reproduce a charge gap of 1.1 eV in the paramagnetic state when a Hund coupling JH = 0.7 eV is included with an on-site Hubbard U = 5 eV. In contrast, with a large U value of 8 eV and negligible Hund coupling JH, CrI3 is predicted to be a moderately correlated metal in the paramagnetic state. We conclude that CrI3 is a Mott-Hund insulator due to the half-filled configuration of the Cr 3d t2g orbitals. The Cr 3d eg orbitals are occupied by approximately one electron, which leads to strong valence fluctuations so that the Cr 3d orbitals cannot be described by a single state. Moreover, at finite temperature, the calculated ordered static magnetic moment in the ferromagnetic state is significantly larger in the R3 phase than in the C2/m phase. This observation indicates that the structural phase transition from the C2/m phase to the R3 phase with decreasing temperature is driven by ferromagnetic spin fluctuations.
description: 17 pages,6 figures
Cutting rules on a cylinder and simplified diagrammatic approach to $CP$ violation in quantum kinetic theory
Creators: name: Maták, Peter
name: Blažek, Tomáš
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We briefly explain a novel diagrammatic method for including thermal corrections in $CP$ asymmetric reaction rates entering the quantum Boltzmann equation. In thermal equilibrium, the asymmetries have to cancel precisely due to the $S$-matrix unitarity and $CPT$ invariance. Such cancelations are easy to track in zero-temperature leading-order calculations. However, accounting for medium effects requires modification of the on-shell part of propagators and, consequently, the $CP$ violating rates. In the literature, the correct form of the statistical factors in the asymmetry source term has been obtained employing the real-time-formalism of non-equilibrium field theory in a certain approximation. We demonstrate that the same results can be obtained by summing an infinite sequence of zero-temperature asymmetries. Those are derived from cuttings of forward diagrams drawn on a cylindrical surface, while thermal corrections come from windings of their propagators. The procedure is entirely diagrammatic, and the $CPT$ and unitarity cancelations are formulated for thermally corrected reaction rate asymmetries. The simplification achieved is the primary focus of our work. The aspect of infrared finiteness in higher-order corrections will also be discussed.
description: 7th Symposium on Prospects in the Physics of Discrete Symmetries (DISCRETE 2020-2021) 29th November - 3rd December 2021
Library Learning and Teaching Partnership Framework
Creators: name: La Trobe University Library
Publisher: name: La Trobe
Year: 2021
Subjects: Uncategorized

description: The Library Learning and Teaching Partnership Framework (LLTP Framework) provides a broad overview of the Library’s commitment and approach to supporting learning and teaching in partnership with University staff and students. It articulates and guides how Library staff partner with University colleagues to embed information and digital literacy skills development in the curriculum and support the development these skills through library co-curricular programs and services.
Les Fondements de la finance comportementale : Émergence et contradictions théoriques fondamentales
Creators: name: EL GHMARI Omar
name: EL GHMARI Imad
Publisher: name: Zenodo
Year: 2024

description: L'article examine les fondements de la finance comportementale, qui postule que les êtres humains sont intrinsèquement irrationnels dans leurs décisions financières. Malgré l'absence d'individus totalement rationnels, cette irrationalité se révèle systématique et prévisible, ce qui permet d'envisager son application dans le domaine financier.

L'efficacité et la stabilité des marchés financiers dépendent largement des comportements individuels et collectifs des participants. Ainsi, l'étude des processus financiers sous l'angle comportemental est essentielle, tant sur le plan scientifique que pratique. Comprendre la nature des comportements irrationnels, plutôt que de s'en tenir à une simple observation, est crucial pour donner un sens aux recherches et prédire les tendances du marché.

L'article met en lumière l'émergence de la finance comportementale en tant que discipline tout en soulignant les contradictions théoriques fondamentales qu'elle soulève par rapport à la théorie de l'utilité espérée. Les avancées en finance comportementale permettent de réévaluer les processus des marchés financiers et d'intégrer ces connaissances pour créer des environnements financiers plus efficaces, en tenant compte des incomplétudes d'information dues à des raisons objectives et subjectives.
The Solar Ultraviolet Imaging Telescope onboard Aditya-L1
Creators: name: Tripathi, Durgesh
name: Ramaprakash, A. N.
name: Khan, Aafaque
name: Ghosh, Avyarthana
name: Chatterjee, Subhamoy
name: Banerjee, Dipankar
name: Chordia, Pravin
name: Gandorfer, Achim
name: Krivova, Natalie
name: Nandy, Dibyendu
name: Rajarshi, Chaitanya
name: Solanki, Sami K.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The Solar Ultraviolet Imaging Telescope (SUIT) is an instrument onboard the Aditya-L1 mission of ISRO that will measure and monitor the solar radiation emitted in the near-ultraviolet wavelength range (200-400 nm). SUIT will simultaneously map the photosphere and the chromosphere of the Sun using 11 filters sensitive to different wavelengths and covering different heights in the solar atmosphere and help us understand the processes involved in the transfer of mass and energy from one layer to the other. SUIT will also allow us to measure and monitor spatially resolved solar spectral irradiance that governs the chemistry of oxygen and ozone in the stratosphere of Earth's atmosphere. This is central to our understanding of the Sun climate relationship.
description: 5 Figures, Published in Current Science
C/EBPα regulates CRL4Cdt2-mediated degradation of p21 in response to UVB-induced DNA damage to control the G1/S checkpoint
Creators: name: Hall, Jonathan R
name: Bereman, Michael S
name: Angelito I Nepomuceno
name: Thompson, Elizabeth A
name: Muddiman, David C
name: Smart, Robert C
Publisher: name: Taylor & Francis
Year: 2014
Subjects: subject: Hematology
subject: 111714 Mental Health
subject: FOS: Health sciences
subject: Cancer
subject: Developmental Biology
subject: Immunology
subject: FOS: Clinical medicine
subject: Biotechnology
subject: Physiology
subject: FOS: Biological sciences
subject: Molecular Biology
subject: Genetics
subject: Cell Biology
subject: Medicine
subject: Physics
subject: Biochemistry

description: The bZIP transcription factor, C/EBPα is highly inducible by UVB and other DNA damaging agents in keratinocytes. C/EBPα-deficient keratinocytes fail to undergo cell cycle arrest in G1 in response to UVB-induced DNA damage and mice lacking epidermal C/EBPα are highly susceptible to UVB-induced skin cancer. The mechanism through which C/EBPα regulates the cell cycle checkpoint in response to DNA damage is unknown. Here we report untreated C/EBPα-deficient keratinocytes have normal levels of the cyclin-dependent kinase inhibitor, p21, however, UVB-treated C/EBPα-deficient keratinocytes fail to up-regulate nuclear p21 protein levels despite normal up-regulation of Cdkn1a mRNA levels. UVB-treated C/EBPα-deficient keratinocytes displayed a 4-fold decrease in nuclear p21 protein half-life due to the increased proteasomal degradation of p21 via the E3 ubiquitin ligase CRL4Cdt2. Cdt2 is the substrate recognition subunit of CRL4Cdt2 and Cdt2 mRNA and protein levels were up-regulated in UVB-treated C/EBPα-deficient keratinocytes. Knockdown of Cdt2 restored p21 protein levels in UVB-treated C/EBPα-deficient keratinocytes. Lastly, the failure to accumulate p21 in response to UVB in C/EBPα-deficient keratinocytes resulted in decreased p21 interactions with critical cell cycle regulatory proteins, increased CDK2 activity, and inappropriate entry into S-phase. These findings reveal C/EBPα regulates G1/S cell cycle arrest in response to DNA damage via the control of CRL4Cdt2 mediated degradation of p21.
Effect of the magnetic charge on weak deflection angle and greybody bound of the black hole in Einstein-Gauss-Bonnet gravity
Creators: name: Javed, Wajiha
name: Aqib, Muhammad
name: Övgün, Ali
Publisher: name: arXiv
Year: 2022
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The objective of this paper is to analyze the weak deflection angle of Einstein-Gauss-Bonnet gravity in the presence of plasma medium. To attain our results, we implement the Gibbons and Werner approach and use the Gauss-Bonnet theorem to Einstein gravity to acquire the resulting deflection angle of photon's ray in the weak field limit. Moreover, we illustrate the behavior of plasma medium and non-plasma mediums on the deflection of photon's ray in the framework of Einstein-Gauss-Bonnet gravity. Similarly, we observe the graphical influences of deflection angle on Einstein-Gauss-Bonnet gravity with the consideration of both plasma and non-plasma mediums. Later, we observe the rigorous bounds phenomenon of the greybody factor in contact with Einstein-Gauss-Bonnet gravity and calculate the outcomes, analyze graphically for specific values of parameters.
description: 11 pages. Accepted for publication in Physics Letters B (https://www.sciencedirect.com/science/article/pii/S0370269322002489)
Magnetic dynamos in white dwarfs -III: explaining the occurrence of strong magnetic fields in close double white dwarfs
Creators: name: Schreiber, Matthias. R.
name: Belloni, Diogo
name: Zorotovic, Monica
name: Zapata, Sarai
name: Gänsicke, Boris T.
name: Parsons, Steven G.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The origin of strong magnetic fields in white dwarfs has been a puzzle for decades. Recently, a dynamo mechanism operating in rapidly rotating and crystallizing white dwarfs has been suggested to explain the occurrence rates of strong magnetic fields in white dwarfs with close low-mass main sequence star companions. Here we investigate whether the same mechanism may produce strong magnetic fields in close double white dwarfs. The only known strongly magnetic white dwarf that is part of a close double white dwarf system, the magnetic component of NLTT 12758, is rapidly rotating and likely crystallizing and therefore the proposed dynamo mechanism represents an excellent scenario for the origin of its magnetic field. Presenting a revised formation scenario for NLTT 12758, we find a natural explanation for the rapid rotation of the magnetic component. We furthermore show that it is not surprising that strong magnetic fields have not been detected in all other known double white dwarfs. We therefore conclude that the incidence of magnetic fields in close double white dwarfs supports the idea that a rotation and crystallization driven dynamo plays a major role in the generation of strong magnetic fields in white dwarfs.
description: accepted for publication in MNRAS
Triggering micronovae through magnetically confined accretion flows in accreting white dwarfs
Creators: name: Scaringi, S.
name: Groot, P. J.
name: Knigge, C.
name: Lasota, J. -P.
name: de Martino, D.
name: Cavecchi, Y.
name: Buckley, D. A. H.
name: Camisassa, M. E.
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: Rapid bursts at optical wavelengths have been reported for several accreting white dwarfs, where the optical luminosity can increase by up to a factor 30 in less than an hour fading on timescales of several hours, and where the energy release can reach $\approx10^{39}$ erg ("micronovae"). Several systems have also shown these bursts to be semi-recurrent on timescales of days to months and the temporal profiles of these bursts strongly resemble those observed in Type-I X-ray bursts in accreting neutron stars. It has been suggested that the observed micronovae may be the result of localised thermonuclear runaways on the surface layers of accreting white dwarfs. Here we propose a model where magnetic confinement of the accretion stream on to accreting magnetic white dwarfs may trigger localised thermonuclear runaways. The proposed model to trigger micronovae appears to favour magnetic systems with both high white dwarf masses and high mass-transfer rates.
description: 4 pages, 1 figure. Accepted 2022 April 12 in MNRAS. Received 2022 April 8; in original form 2022 March 7
title: Des formes pour vivre l’environnement
Publisher: name: EHESS
Year: 2015

description: Colloque international organisé par le LADYSS (CNRS/Univ. Paris 1, 7, 8, 10) et le CRAL (CNRS/EHESS) avec l’appui du CNRS, du Labex CAP, de l’EHESS et du ministère de l’Écologie, du Développement durable et de l’Énergie  Présentation La question environnementale est aujourd'hui centrale aussi bien dans les discours politiques, que les travaux scientifiques et le vécu ordinaire. Malgré la diversité des approches selon les acteurs, les échelles, les situations..., les politiques publiques l'abordent avec une volonté de maîtrise, en mettant l'accent sur des dimensions gestionnaires. À partir des formes environnementales (la Terre, nature writing, le paysage, le jardin urbain, etc.), il s'agit de proposer d'autres connaissances, d'autres modes d'évaluation et d'action. Et de rapprocher les réflexions sur culture et environnement, tout en resp
A Rydberg hydrogen beam for studies of stimulated deexcitation
Creators: name: Wolz, Tim
name: Allemand, Maxime
name: Comparat, Daniel
name: Cras, Jules
name: Killian, Carina
name: Malbrunot, Chloé
name: Gustafsson, Fredrik Parnefjord
name: Simon, Martin
name: Siour, Christophe
name: Widmann, Eberhard
Publisher: name: arXiv
Year: 2022
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We present a Rydberg hydrogen beamline developed to commission techniques of stimulated deexcitation for application in antihydrogen experiments at CERN's Antiproton Decelerator. The stimulation of spontaneous decay is a key technology to enhance the number of ground-state anti-atoms available in a beam toward precision spectroscopy and gravity measurements.
Decoherence: From Interpretation to Experiment
Creators: name: Schlosshauer, Maximilian
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: I offer a few selected reflections on the decoherence program, with an emphasis on Zeh's role and views. First, I discuss Zeh's commitment to a realistic interpretation of the quantum state, which he saw as necessary for a consistent understanding of the decoherence process. I suggest that this commitment has been more fundamental than, and prior to, his support of an Everett-style interpretation of quantum mechanics. Seen through this lens, both his defense of Everett and the genesis of his ideas on decoherence emerge as consequences of his realistic view of the quantum state. Second, I give an overview of experiments on decoherence and describe, using the study of collisional decoherence as an example, the close interplay between experimental advances and theoretical modeling in decoherence research.
description: 12 pages, 2 figures
Evaluation of In vitro systems and development of quantitative structure-activity relationships for the prediction of adverse xenobiotic metabolic events
Creators: name: Bradshaw, Peter Robert
Publisher: name: Imperial College London
Year: 2018

description: Reactive metabolites of xenobiotics pose a risk in pharmaceutical development. Many reactive metabolites are capable of forming adducts with cellular macromolecules which can result in toxicity. For example, aromatic amines have been demonstrated to form adducts with DNA leading to genotoxicity. Hydrolysis of amide and cleavage of sulphonamide bonds can act as a source of aromatic amine metabolites which can undergo further bioactivation. It has also been suggested that acyl glucuronide conjugates of carboxylic acid-containing drugs, induce hepatotoxicity through adduct formation. Due to the similar chemistry, it is proposed that acyl glucosides will display similar adduct formation/potential toxicity. Better understanding of the factors that affect the reactivity of xenobiotics will lead to improved safety and reduce late stage attrition rates in the pharmaceutical industry. Within this thesis, the nucleophilic reactivity of amides, sulphonamides and acyl glucosides were investigated using a combination of in vitro and in silico techniques. A congeneric series of fifty five sulphonamides were synthesised and five sulphonamides were determined to undergo glutathione-mediated cleavage. Cleavage of N-(4-trifluoromethylphenyl) benzenesulphonamide, demonstrates that the amine portion of the sulphonamide bond plays a role in determining whether the sulphonamide is cleaved. Comparison of the amide hydrolysis activity of multiple human and animal derived in vitro models, demonstrated the potential of minipig systems as a model for detecting human in vivo relevant metabolites. QSMR and active site models were developed for the prediction of amide hydrolysis and descriptors such as partition coefficient, partial atomic charges and hydrogen bonding were highlighted as important descriptors. The reaction mechanism of the transacylation of acyl glucosides identified key descriptors for predicting the rate of degradation including the ELUMO, electrophilicity index and the calculated activation energy. In addition, comparison of the acyl glucosides to equivalent acyl glucuronides series identified differences in geometry and activation energy between the series.
C/EBPα regulates CRL4Cdt2-mediated degradation of p21 in response to UVB-induced DNA damage to control the G1/S checkpoint
Creators: name: Hall, Jonathan R
name: Bereman, Michael S
name: Angelito I Nepomuceno
name: Thompson, Elizabeth A
name: Muddiman, David C
name: Smart, Robert C
Publisher: name: Taylor & Francis
Year: 2015
Subjects: subject: Hematology
subject: 111714 Mental Health
subject: FOS: Health sciences
subject: Cancer
subject: Developmental Biology
subject: Immunology
subject: FOS: Clinical medicine
subject: Biotechnology
subject: Physiology
subject: FOS: Biological sciences
subject: Molecular Biology
subject: Genetics
subject: Cell Biology
subject: Medicine
subject: Physics
subject: Biochemistry

description: The bZIP transcription factor, C/EBPα is highly inducible by UVB and other DNA damaging agents in keratinocytes. C/EBPα-deficient keratinocytes fail to undergo cell cycle arrest in G1 in response to UVB-induced DNA damage and mice lacking epidermal C/EBPα are highly susceptible to UVB-induced skin cancer. The mechanism through which C/EBPα regulates the cell cycle checkpoint in response to DNA damage is unknown. Here we report untreated C/EBPα-deficient keratinocytes have normal levels of the cyclin-dependent kinase inhibitor, p21, however, UVB-treated C/EBPα-deficient keratinocytes fail to up-regulate nuclear p21 protein levels despite normal up-regulation of Cdkn1a mRNA levels. UVB-treated C/EBPα-deficient keratinocytes displayed a 4-fold decrease in nuclear p21 protein half-life due to the increased proteasomal degradation of p21 via the E3 ubiquitin ligase CRL4Cdt2. Cdt2 is the substrate recognition subunit of CRL4Cdt2 and Cdt2 mRNA and protein levels were up-regulated in UVB-treated C/EBPα-deficient keratinocytes. Knockdown of Cdt2 restored p21 protein levels in UVB-treated C/EBPα-deficient keratinocytes. Lastly, the failure to accumulate p21 in response to UVB in C/EBPα-deficient keratinocytes resulted in decreased p21 interactions with critical cell cycle regulatory proteins, increased CDK2 activity, and inappropriate entry into S-phase. These findings reveal C/EBPα regulates G1/S cell cycle arrest in response to DNA damage via the control of CRL4Cdt2 mediated degradation of p21.
Reinforced Causal Explainer for Graph Neural Networks
Creators: name: Wang, Xiang
name: Wu, Yingxin
name: Zhang, An
name: Feng, Fuli
name: He, Xiangnan
name: Chua, Tat-Seng
Publisher: name: arXiv
Year: 2022
Subjects: subject: Machine Learning (cs.LG)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: Explainability is crucial for probing graph neural networks (GNNs), answering questions like "Why the GNN model makes a certain prediction?". Feature attribution is a prevalent technique of highlighting the explanatory subgraph in the input graph, which plausibly leads the GNN model to make its prediction. Various attribution methods exploit gradient-like or attention scores as the attributions of edges, then select the salient edges with top attribution scores as the explanation. However, most of these works make an untenable assumption - the selected edges are linearly independent - thus leaving the dependencies among edges largely unexplored, especially their coalition effect. We demonstrate unambiguous drawbacks of this assumption - making the explanatory subgraph unfaithful and verbose. To address this challenge, we propose a reinforcement learning agent, Reinforced Causal Explainer (RC-Explainer). It frames the explanation task as a sequential decision process - an explanatory subgraph is successively constructed by adding a salient edge to connect the previously selected subgraph. Technically, its policy network predicts the action of edge addition, and gets a reward that quantifies the action's causal effect on the prediction. Such reward accounts for the dependency of the newly-added edge and the previously-added edges, thus reflecting whether they collaborate together and form a coalition to pursue better explanations. As such, RC-Explainer is able to generate faithful and concise explanations, and has a better generalization power to unseen graphs. When explaining different GNNs on three graph classification datasets, RC-Explainer achieves better or comparable performance to SOTA approaches w.r.t. predictive accuracy and contrastivity, and safely passes sanity checks and visual inspections. Codes are available at https://github.com/xiangwang1223/reinforced_causal_explainer.
description: IEEE Transactions on Pattern Analysis and Machine Intelligence (TPAMI)
THE EFFECT OF CORPORATE TAX AVOIDANCE ON SHAREHOLDER WEALTH IN NIGERIAN FIRMS
Creators: name: Ojeh, Augustine, Ph.D., FCA
name: Ngwa Christian, Ugonna Ph.D
name: Amaechi Marcellus, Chukwu Ph.D.
Publisher: name: noland journal
Year: 2025
Subjects: Corporate tax avoidance
shareholder wealth
corporate governance
tax strategies.

description: This study examined the effect of corporate tax avoidance on shareholder wealth in Nigerian firms, with a particular focus on its relationship with corporate reputation, long-term sustainability, and the moderating role of corporate governance. A survey method was employed, with data collected from 267 respondents across various business sectors. The findings reveal that the majority of respondents (44.9%) believe corporate tax avoidance positively impacts shareholder wealth, though 30% of respondents expressed concerns that it could have a negative effect. Additionally, tax avoidance was found to have mixed perceptions regarding its impact on long-term sustainability, with 39.3% of respondents indicating it harms sustainability, while others viewed it as either having no effect or contributing positively. When it comes to corporate reputation, 44.9% of respondents felt that tax avoidance significantly damages a firm's image, highlighting concerns over the long-term effects on public perception. Furthermore, the study reveals that corporate governance plays a crucial role in mitigating the negative impacts of tax avoidance, with the majority of respondents (74.9%) recognizing the importance of governance in managing tax avoidance practices ethically. In conclusion, the study suggests that while tax avoidance may provide short-term financial gains, its potential long-term consequences on corporate reputation and sustainability require careful management, with strong corporate governance being key to mitigating associated risks.