cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
The Júcar River Basin Case Study: A Challenge For Today, A Challenge For Tomorrow
Creators: name: Macian-Sorribes, Hector
name: Pedro-Monzonis, Maria
name: Momblanch, Andrea
name: Paredes-Arquiola, Javier
name: Pulido-Velazquez, Manuel
name: Solera, Abel
name: Joaquin Andreu
Publisher: name: Zenodo
Year: 2016
Subjects: Water resources
Júcar River Basin
IMPREX
Drought
Hydropower

description: Poster presented by the Universitat Politècnica de València (UPV) team at the stand of the IMPREX project in the Adaptation Futures 2016 Conference in Rotterdam (The Netherlands).

IMPREX has received funding from the European Union Horizon 2020 Research and Innovation Programme under Grant agreement N° 641811
Newton's 2nd Law, Radiation Reaction & Type II Einstein-Maxwell Fields
Creators: name: Newman, Ezra T.
Publisher: name: arXiv
Year: 2011
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: Considering perturbations off the Reissner-Nordstrom metric while keeping the perturbations in the class of type II Einstein-Maxwell metrics, we do a spherical harmonic expansion of all the variables up to the quadrupole term. This leads to a rather surprising results. Referring to the source of the metric as a type II particle (analogous to referring to a Schwarzschild-Reissner-Nordstrom or Kerr-Newman particle), we see immediately that the Bondi momentum of the particle take the classical form of mass times velocity plus an electromagnetic radiation reaction term while the Bondi mass loss equation become the classical gravitational and electromagnetic (electric and magnetic) dipole and quadrupole radiation. The Bondi momentum loss equation turns into Newtons second law of motion containing the Abraham, Lorentz, Dirac radiation reaction force plus a momentum recoil (rocket) force while the reality condition on the Bondi mass aspect yields the conservation of angular momentum.
description: 15 pages
The ELM Survey South. II. Two dozen new low mass white dwarf binaries
Creators: name: Kosakowski, Alekzander
name: Brown, Warren R.
name: Kilic, Mukremin
name: Kupfer, Thomas
name: Bédard, Antoine
name: Gianninas, A.
name: Agüeros, Marcel A.
name: Barrientos, Manuel
Publisher: name: arXiv
Year: 2023
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present the results from our ongoing spectroscopic survey targeting low mass white dwarf binaries, focusing on the southern sky. We used a Gaia DR2 and eDR3 based selection and identified 28 new binaries, including 19 new extremely low mass white dwarfs, one short period, likely eclipsing, DABZ, and two potential LISA binaries. We present orbital and atmospheric parameters for each new binary based on our spectroscopic follow-up. Four of our new binaries show periodic photometric variability in the TESS 2-minute cadence data, including one new eclipsing double-lined spectroscopic binary. Three others show periodic photometric variability in ZTF, including one new eclipsing binary. We provide estimates for the inclinations and scaled component radii for these ZTF variables, based on light curve modeling to our high-speed photometric follow-up observations. Our observations have increased the sample of ELM Survey binaries identified in the southern sky to 41, an increase of 64%. Future time domain surveys, such as BlackGEM and the Vera C. Rubin Observatory Legacy Survey of Space and Time, will efficiently identify the photometric variables in the southern sky and significantly increase the population of southern sky low mass white dwarf binaries, leading to a more complete all-sky population of these systems.
description: 28 pages. 13 Figures, 5 Tables. Accepted for publication in The Astrophysical Journal
Petrogenesis of the Highwood and Alonite petrographic subprovinces of the Highwood Mountain area, Montana
Creators: name: Nicoll, L. D.
Publisher: name: University of Calgary
Year: 1974
Subjects: subject: QE 445 M6 N52 1974 Microfiche
subject: Petrology - Montana - Highwood Mountain area
subject: Rocks, Igneous

description: Bibliography: p. 119-123.
CHEX-MATE: Constraining the origin of the scatter in galaxy cluster radial X-ray surface brightness profiles
Creators: name: Bartalucci, I.
name: Molendi, S.
name: Rasia, E.
name: Pratt, G. W.
name: Arnaud, M.
name: Rossetti, M.
name: Gastaldello, F.
name: Eckert, D.
name: Balboni, M.
name: Borgani, S.
name: Bourdin, H.
name: Campitiello, M. G.
name: De Grandi, S.
name: De Petris, M.
name: Duffy, R. T.
name: Ettori, S.
name: Ferragamo, A.
name: Gaspari, M.
name: Gavazzi, R.
name: Ghizzardi, S.
name: Iqbal, A.
name: Kay, S. T.
name: Lovisari, L.
name: Mazzotta, P.
name: Maughan, B. J.
name: Pointecouteau, E.
name: Riva, G.
name: Sereno, M.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We investigate the statistical properties and the origin of the scatter within the spatially resolved surface brightness profiles of the CHEX-MATE sample, formed by 118 galaxy clusters selected via the SZ effect. These objects have been drawn from the Planck SZ catalogue and cover a wide range of masses, M$_{500}=[2-15] \times 10^{14} $M$_{\odot}$, and redshift, z=[0.05,0.6]. We derived the surface brightness and emission measure profiles and determined the statistical properties of the full sample. We found that there is a critical scale, R$\sim 0.4 R_{500}$, within which morphologically relaxed and disturbed object profiles diverge. The median of each sub-sample differs by a factor of $\sim 10$ at $0.05\,R_{500}$. There are no significant differences between mass- and redshift-selected sub-samples once proper scaling is applied. We compare CHEX-MATE with a sample of 115 clusters drawn from the The Three Hundred suite of cosmological simulations. We found that simulated emission measure profiles are systematically steeper than those of observations. For the first time, the simulations were used to break down the components causing the scatter between the profiles. We investigated the behaviour of the scatter due to object-by-object variation. We found that the high scatter, approximately 110%, at $R<0.4R_{500}$ is due to a genuine difference between the distribution of the gas in the core. The intermediate scale, $R_{500} =[0.4-0.8]$, is characterised by the minimum value of the scatter on the order of 0.56, indicating a region where cluster profiles are the closest to the self-similar regime. Larger scales are characterised by increasing scatter due to the complex spatial distribution of the gas. Also for the first time, we verify that the scatter due to projection effects is smaller than the scatter due to genuine object-by-object variation in all the considered scales. [abridged]
description: Accepted for publication in A&A
Charge-Density Waves vs. Superconductivity: Some Results and Future Perspectives
Creators: name: Venditti, Giulia
name: Caprara, Sergio
Publisher: name: arXiv
Year: 2023
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Increasing experimental evidence suggests the occurrence of filamentary superconductivity in different (quasi) two-dimensional physical systems. In this piece of work, we discuss the proposal that under certain circumstances, this occurrence may be related to the competition with a phase characterized by charge ordering in the form of charge-density waves. We provide a brief summary of experimental evidence supporting our argument in two paradigmatic classes of materials, namely transition metal dichalcogenides and cuprates superconductors. We present a simple Ginzburg-Landau two-order-parameters model as a starting point to address the study of such competition. We finally discuss the outcomes of a more sophisticated model, already presented in the literature and encoding the presence of impurities, and how it can be further improved in order to really address the interplay between charge-density waves and superconductivity and the possible occurrence of filamentary superconductivity at the domain walls between different charge-ordered regions.
description: 20 pages, 6 figures, Published on Condensed Matter, Special Issue "Fluctuations and Highly Non-linear Phenomena in Superfluids and Superconductors VII"
The local description of the Ricci and Bianchi identities for an h-normal N-linear connection on the dual 1-jet space J^{1*}(T,M)
Creators: name: Oana, Alexandru
name: Neagu, Mircea
Publisher: name: arXiv
Year: 2011
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 53B40, 53C60, 53C07

description: In this paper we describe the local Ricci and Bianchi identities for an h-normal N-linear connection DΓ(N) on the dual 1-jet space J^{1*}(T,M). To reach this aim, we firstly give the expressions of the local distinguished (d-) adapted components of torsion and curvature tensors produced by DΓ(N), and then we analyze their attached local Ricci identities. The derived deflection d-tensor identities are also presented. Finally, we expose the local expressions of the Bianchi identities (in the particular case of an h-normal N-linear connection of Cartan type), which geometrically connect the local torsion and curvature d-tensors of the linear connection DΓ(N).
description: 18 pages
Cognition and the concrete poetry of bpNichol : towards a cohesive methodology
Creators: name: Borkent, Michael
Publisher: name: University of British Columbia
Year: 2009

description: This study examines visual and concrete poetry by the influential Canadian poet bpNichol and the related scholarly criticism. Visual poetry is multimodal, employing the materiality of the book, page, words and letters, as well as artistic flourishes, playful engagements with conventions, and so on, to broaden the reader’s perception and understanding of language and communication. Previous scholarship has varied widely in engaging visual poetry, and in particular with bpNichol’s, in part by focusing on a schism between the pictorial and verbal content or by suppressing the contribution of visuality to the meanings of these texts. Thus, the material and visual focus of this poetry challenges how scholars discuss textual meaning and how it connects to other works, poetic philosophies, and theory. This study offers a framework developed from research in Cognitive Science which illustrates how language and images synthesize through cognitive processes rooted in metonymy, metaphor, and iconicity, best articulated through Conceptual Integration Theory (also called blending). The cognitive view of language traces connections between the body and the mind, illustrating the inextricable links between perceptual and conceptual meanings through embodiment. This view of language and meaning allows for connections between images and texts on various levels of knowledge. This methodology promotes a more expansive and holistic engagement with Nichol’s oeuvre, showing connections between his poetry, prose, and poetics. While it certainly has affinities with previous scholarship, the cognitive model also qualifies some conclusions in important ways, primarily by placing emphasis on the construction of meaning from both visual and verbal prompts rather than a tension between these representative modes. The cognitive perspective offers a means of discussing the generativity of simplicity in multimodal poetry with clarity and alacrity through a more organic view of meaning. Due to the prevalence of multimodal texts beyond visual poetry, the final chapter of this study illustrates how the cognitive methodology can contribute to studies of comics, children’s books, advertising, culture-jamming, graffiti, and media ecology. This study contributes to the broader discussion of materiality and meaning by illustrating the complexity of cognition involved in understanding multimodal texts.
Ionised gas outflows over the radio AGN life cycle
Creators: name: Kukreti, Pranav
name: Morganti, Raffaella
name: Tadhunter, Clive
name: Santoro, Francesco
Publisher: name: arXiv
Year: 2023
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Feedback from AGN is known to affect the host galaxy's evolution. In radio AGN, one manifestation of feedback is seen in gas outflows. However, it is still not well understood whether the effect of feedback evolves with the radio AGN life cycle. In this study, we investigate this link using the radio spectral shape as a proxy for the evolutionary stage of the AGN. We used [OIII] emission line spectra to trace the presence of outflows on the ionised gas. Using a sample of uniformly selected 129 radio AGN with $L_\textrm{1.4GHz}\approx10^{23}-10^{26}$ W Hz$^{-1}$, and a mean stacking analysis of the [OIII] profile, we conclude that the ionised gas outflow is linked to the radio spectral shape, and it evolves with the evolution of the radio source. We find that sources with a peak in their radio spectra (optically thick), on average, drive a broad outflow ($FWHM\approx1330\pm418$ km s$^{-1}$) with a velocity $v_\textrm{out}\approx 240$ km s$^{-1}$. However, we detect no outflow in the stacked [OIII] profile of sources without a peak in their radio spectrum. In addition, we find that individual outflow detections are kinematically more extreme in peaked than non-peaked sources. We conclude that radio jets are most effective at driving gas outflows when young, and the outflow is typically short lived. Our stacking analysis shows no significant dependence of the presence of ionised gas outflows on the radio morphology, 1.4 GHz luminosity, optical luminosity and Eddington ratio of these sources. We also identify candidate restarted AGN in our sample, whose [OIII] profiles suggest that they have more disturbed gas kinematics than their evolved counterparts, although the evidence for this is tentative. Our findings support the picture where the impact of AGN feedback changes as the source evolves, and young radio jets interact with the ambient medium, clearing a channel of gas as they expand.
description: 20 pages, 12 figures. Accepted for publication in Astronomy and Astrophysics
Light Sensor Candidates for the Cherenkov Telescope Array
Creators: name: Knoetig, M. L.
name: Mirzoyan, R.
name: Kurz, M.
name: Hose, J.
name: Lorenz, E.
name: Schweizer, T.
name: Teshima, M.
name: Buzhan, P.
name: Popova, E.
name: Bolmont, J.
name: Tavernet, J. -P.
name: Vincent, P.
name: Shayduk, M.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: High Energy Physics - Experiment (hep-ex)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: We report on the characterization of candidate light sensors for use in the next-generation Imaging Atmospheric Cherenkov Telescope project called Cherenkov Telescope Array, a major astro-particle physics project of about 100 telescopes that is currently in the prototyping phase. Our goal is to develop with the manufacturers the best possible light sensors (highest photon detection efficiency, lowest crosstalk and afterpulsing). The cameras of those telescopes will be based on classical super-bi-alkali Photomultiplier tubes but also Silicon Photomultipliers are candidate light sensors. A full characterisation of selected sensors was done. We are working in close contact with several manufacturers, giving them feedback and suggesting improvements.
description: 5 pages, 3 figures, ICATPP Conference 2011, Como, Italy, to be published in Cosmic Rays for Particle and Astroparticle Physics, Proceedings of the 13th ICATPP Conference
Coupling Clinical Decision Support System with Computerized Prescriber Order Entry and their Dynamic Plugging in the Medical Workflow System
Creators: name: Bouzguenda, Lotfi
name: Turki, Manel
Publisher: name: arXiv
Year: 2012
Subjects: subject: Multiagent Systems (cs.MA)
subject: FOS: Computer and information sciences

description: This work deals with coupling Clinical Decision Support System (CDSS) with Computerized Prescriber Order Entry (CPOE) and their dynamic plugging in the medical Workflow Management System (WfMS). First, in this paper we argue some existing CDSS representative of the state of the art in order to emphasize their inability to deal with coupling with CPOE and medical WfMS. The multi-agent technology is at the basis of our proposition since (i) it provides natural abstractions to deal with distribution, heterogeneity and autonomy which are inherent to the previous systems (CDSS, CPOE and medical WfMS), and (ii) it introduces powerful concepts such as organizations, goals and roles useful to describe in details the coordination of the different components involved in these systems. In this paper, we also propose a Multi-Agent System (MAS) to support the coupling CDSS with CPOE. Finally, we show how we integrate the proposed MAS in the medical workflow management system which is also based on collaborating agents
description: International Conference on Information Technology and e-services, ICITeS'12, IEEE, March 24-26,Sousse-Tunisia, 2012
No Surviving SN Ia Companion In SNR 0509-67.5: Stellar Population Characterization and Comparison To Models
Creators: name: Shields, Joshua V.
name: Arunachalam, Prasiddha
name: Kerzendorf, Wolfgang
name: Hughes, John P.
name: Biriouk, Sofia
name: Monk, Hayden
name: Buchner, Johannes
Publisher: name: arXiv
Year: 2023
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The community agrees that Type Ia supernovae arise from Carbon/Oxygen white dwarfs undergoing thermonuclear runaway. However, the full progenitor system and the process that prompts the white dwarf to explode remain unknown. Most current models suggest that the white dwarf explodes because of interaction with a binary companion which may survive the process and remain within the resulting remnant of the exploded star. Furthermore, both the pre-supernova interaction process and the explosion of the primary are expected to imprint a significant departure from ordinary stellar radii and temperatures onto the secondary, making the star identifiable against the unrelated stellar population. Identification of a surviving companion inside an SN Ia remnant might confirm a specific corresponding SN Ia progenitor channel based on the identity of the companion. We conducted a surviving companion search of the Type Ia remnant SNR 0509-67.5 based in the Large Magellanic Cloud. The well-constrained distance to and foreground extinction of the Large Magellanic Cloud allow for Bayesian inference of stellar parameters with low correlation and uncertainties. We present a deep catalog of fully characterized stars interior to SNR 0509-67.5 with radii, effective temperatures, and metallicities inferred using combined Hubble Space Telescope photometric observations across multiple visits. We then compile a list of surviving companion models appropriate for the age of the remnant (roughly 400 years after the explosion). We compare these predictions with the inferred stellar parameters and conclude that none of the stars are consistent with the predicted signatures of a surviving companion.
description: 16 pages, 8 figures, 4 tables
A Significant Population of Candidate New Members of the Rho Ophiuchi Cluster
Creators: name: Barsony, Mary
name: Haisch,, Karl E.
name: Marsh, Kenneth A.
name: McCarthy, Chris
Publisher: name: arXiv
Year: 2012
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present a general method for identifying the pre-main-sequence population of any star-forming region, unbiased with respect to the presence or absence of disks, in contrast to samples selected primarily via their mid-infrared emission from Spitzer surveys. We have applied this technique to a new, deep, wide-field, near-infrared imaging survey of the Rho Ophiuchi cloud core to search for candidate low mass members. In conjunction with published Spitzer IRAC photometry, and least squares fits of model spectra (COND, DUSTY, NextGen, and blackbody) to the observed spectral energy distributions, we have identified 948 candidate cloud members within our 90% completeness limits of J=20.0, H=20.0, and K_S=18.50. This population represents a factor of ~3 increase in the number of known young stellar objects in the Rho Ophiuchi cloud. A large fraction of the candidate cluster members (81% +/- 3%) exhibit infrared excess emission consistent with the presence of disks, thus strengthening the possibility of their being bona fide cloud members. Spectroscopic follow-up will confirm the nature of individual objects, better constrain their parameters, and allow an initial mass function to be derived.
description: 39 pages including 7 figures, 4 tables Table 3 is available in electronic form in the on-line journal and at http://physics.sfsu.edu/~mbarsony
L’enseignement des droits humains dans les lycées marocains : les objectifs et les contraintes
Creators: name: Côté-Vaillant, Étienne
Publisher: name: Université d'Ottawa / University of Ottawa
Year: 2021
Subjects: Enseignement
Droits humains
Éducation nationale marocaine
Éducation à la citoyenneté
Incivilité à l'école
Éducation islamique
Relation apprenant-enseignant

description: Quels sont les objectifs de l’enseignement des droits humains dans les lycées de la ville de Rabat, appuyé par la réforme de l’éducation « Vision stratégique 2015-2030 » ? Si l’enseignement des droits humains n’est pas un phénomène nouveau, il reste un sujet hautement conflictuel, dense et complexe, où il est nécessaire de poursuivre son exploration et son étude. Cette étude qualitative de type analyse de contenu qualitatif a pour objectif principal de définir, recenser et évaluer les objectifs de ce type d’enseignement actuellement diffusé dans les lycées de la ville de Rabat et promu par le plan de réforme éducative. Afin de répondre aux visées de cette thèse, une recension de la littérature scientifique a été réalisée sur les sujets suivant : les droits humains, la citoyenneté, l’éducation aux droits humains et la violence scolaire au Maroc. Plusieurs aspects liés à ces thèmes ont alors pu être explorés : les définitions conflictuelles des droits humains et de la citoyenneté, les visées de leur enseignement et les contradictions qui s’y déploient. Cette recension des écrits a permis d’identifier les principales données à contrôler lors de l’enquête de terrain, réalisée auprès d’enseignants du lycée, de jeunes citoyens âgés entre 18 et 24 ans et d’experts de l’éducation nationale. Ainsi, il a pu être présenté les trois grandes thématiques dans lesquelles s’inscrivent les objectifs de l’enseignement des droits humains dans les lycées marocains : celle de l’éducation à la citoyenneté, de la consolidation de la pédagogie et de l’appréciation de la dignité humaine. Dans un deuxième temps, certaines données observées ont pu être analysées par un regard critique sur, entre autres, les déterminants et les influences d’une appartenance à la civilisation islamique, ainsi que les enjeux liés aux tensions entourant la définition sur la scène internationale des droits humains et de ses normes éducatives. Ce faisant, des paradoxes et des problématiques majeures entourant le sujet à l’étude ont pu être mis en lumière et contestés.
A Lyman alpha halo around a quasar at redshift z=6.4
Creators: name: Willott, Chris J.
name: Chet, Savironi
name: Bergeron, Jacqueline
name: Hutchings, John B.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We present long-slit spectroscopic data which reveals extended Lyman alpha emission around the z=6.417 radio-quiet quasar CFHQS J2329-0301. The Lyman alpha emission is extended over 15 kpc and has a luminosity of > 8 x 10^36 W, comparable to the most luminous Lyman alpha halos known. The emission has complex kinematics, in part due to foreground absorption which only partly covers the extended nebula. The velocity ranges from -500 km/s to +500 km/s, with a peak remarkably close to the systemic velocity identified by broad MgII emission of the quasar. There is no evidence for infall or outflow of the halo gas. We speculate that the Lyman alpha emission mechanism is recombination after quasar photo-ionization of gas sitting within a high-mass dark matter halo. The immense Lyman alpha luminosity indicates a higher covering factor of cold gas compared to typical radio-quiet quasars at lower redshift.
description: 7 pages, 7 figures, AJ, in press
Holographic effective theories for strongly coupled physics
Creators: name: Shieh, Hsien-Hang
Publisher: name: University of British Columbia
Year: 2009

description: In this thesis we summarize three of our work using the gauge/gravity dualities to build effective theories for strongly coupled phenomena. First, we study the thermodynamics of large N pure 2+1 dimensional Yang-Mills theory on a small spatial S². By studying the effective action for the Polyakov loop order parameter, we show analytically that the theory has a second order deconfinement transition. Our results together with extrapolation of lattice QCD results imply a critical radius in the phase diagram where the deconfinement transition switches from second order to first order. We show that the point at the critical radius and temperature can be either a tricritical point with universal behavior or a triple point separating three distinct phases. Second, we study a model of holographic QCD at zero temperature and finite chemical potential. We find that as the baryon chemical potential is increased, the system transitions to a nuclear matter phase characterized by a condensate of instantons on the probe D-branes in the string theory dual. The electrostatic interactions between the instantons cause the condensate to expand towards the UV with increasing chemical potential, giving a holographic version of the expansion of the Fermi surface. We also find possible explanation of the ``chiral density wave'' instability in large N QCD. We argue that the model can be used to make semi-quantitative predictions of the binding energy per nucleon for nuclear matter in QCD. Third, we consider an Abelian Higgs model placed in an AdS black hole background. Such model has been shown to exhibit superconductor like transitions. In the superconducting phase the system shows infinite DC conductivity. This suggests the possibility of turning on a time independent supercurrent. In this paper we study such supercurrent solutions and the associated phase diagram. We find a critical point in the phase diagram where the second order superconducting transition becomes first order. Supercurrent solutions are well studied in condensed matter systems. We find some qualitative agreement with known results.
The lively accretion disc in NGC 2992. III. Tentative evidence of rapid Ultra Fast Outflow variability
Creators: name: Luminari, Alfredo
name: Marinucci, Andrea
name: Bianchi, Stefano
name: de Marco, Barbara
name: Feruglio, Chiara
name: Matt, Giorgio
name: Middei, Riccardo
name: Nardini, Emanuele
name: Piconcelli, Enrico
name: Puccetti, Simonetta
name: Tombesi, Francesco
Publisher: name: arXiv
Year: 2023
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We report on the 2019 XMM-Newton+NuSTAR monitoring campaign of the Seyfert galaxy NGC 2992, observed at one of its highest flux levels in the X-rays. The time-averaged spectra of the two XMM-Newton orbits show Ultra Fast Outflows (UFOs) absorbing structures above 9 keV with $> 3 σ$ significance. A detailed investigation of the temporal evolution on a $\sim$5 ks time scale reveals UFO absorption lines at a confidence level $>$95% (2$σ$) in 8 out of 50 XMM-Newton segments, estimated via Monte Carlo simulations. We observe a wind variability corresponding to a length scale of 5 Schwarzschild radii $r_S$. Adopting the novel Wind in the Ionised Nuclear Environment (WINE) model, we estimate the outflowing gas velocity ($v=0.21-0.45 c$), column density ($N_H=4-8\cdot 10^{24} cm^{-2}$) and ionisation state ($\log(ξ_0/erg\ cm\ s^{-1})=3.7-4.7$), taking into account geometrical and special relativity corrections. These parameters lead to instantaneous mass outflow rates $\dot{M}_{out}\simeq0.3-0.8 M_{\odot} yr^{-1}$, with associated outflow momentum rates $\dot{p}_{out}\simeq 20-90 L_{Bol}/c$ and kinetic energy rates $\dot{E}_K \simeq 2-25 L_{Bol}$. We estimate a wind duty cycle $\approx$ 12% and a total mechanical power $\approx$ 2 times the AGN bolometric luminosity, suggesting the wind may drive significant feedback effects between the AGN and the host galaxy. Notably, we also provide an estimate for the wind launching radius and density $\approx 5 r_S, 10^{11} {cm}^{-3}$, respectively.
description: Accepted for publication in the Astrophysical Journal. 21 pages, 11 figures
Ancient Medicine, Modern Quackery: Bernard Mandeville And The Rhetoric Of Healing [Sample]
Creators: name: Kleiman-Lafon, Sylvie
Publisher: name: Zenodo
Year: 2016
Subjects: Bernard Mandeville, rhetoric, ancients, moderns, quacks, method, medicine

description: Just a sample from a book chapter to be published in June (in Paddy Bullard and Alexis Tadié, Ancients and Moderns in Europe, a comparative perspective, Oxford, Voltaire Foundation, 2016). 
The chromatic Point Spread Function of weak lensing measurement in Chinese Space Station survey Telescope
Creators: name: Liu, Q. Y.
name: Er, X. Z.
name: Fan, Z. H.
name: Liu, D. Z.
name: Li, G. L.
name: Wei, C. L.
name: Ban, Z.
name: Li, X. B.
name: Yue, D.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: The weak gravitational lensing is a powerful tool in modern cosmology. To accurately measure the weak lensing signal, one has to control the systematic bias to a small level. One of the most difficult problems is how to correct the smearing effect of the Point Spread Function (PSF) on the shape of the galaxies. The chromaticity of PSF for a broad-band observation can lead to new subtle effects. Since the PSF is wavelength dependent and the spectrum energy distributions between stars and galaxies are different, the effective PSF measured from the star images will be different from that smears the galaxies. Such a bias is called colour bias. We estimate it in the optical bands of the Chinese Space Station Survey Telescope from simulated PSFs, and show the dependence on the colour and redshift of the galaxies. Moreover, due to the spatial variation of spectra over the galaxy image, there exists another higher-order bias, colour gradient bias. Our results show that both colour bias and colour gradient bias are generally below $0.1$ percent in CSST. Only for small-size galaxies, one needs to be careful about the colour gradient bias in the weak lensing analysis using CSST data.
Unveiling the initial conditions of open star cluster formation
Creators: name: Hao, C. J.
name: Xu, Y.
name: Hou, L. G.
name: Lin, Z. H.
name: Li, Y. J.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Open clusters (OCs) are infrequent survivors of embedded clusters gestated in molecular clouds. Up to now, little is known about the initial conditions for the formation of OCs. Here, we studied this issue using high-precision astrometric parameters provided by Gaia data release 3. The statistics show that the peculiar motion velocities of OCs vary little from infancy to old age, providing a remarkable opportunity to use OCs to trace their progenitors. Adopting a dynamical method, we derived the masses of the progenitor clumps where OCs were born, which have statistical characteristics comparable to previously known results for clumps observed in the Galaxy. Moreover, the masses of the progenitor clumps of OCs indicate they should be capable of gestating massive O-type stars. In fact, after inspecting the observed OCs and O-type stars, we found that there are many O-type stars in OCs. The destructive stellar feedback from O-type stars may disintegrate the vast majority of embedded clusters, and only those sufficiently dense ones can survive as OCs.
description: 8 figures, 1 table, Accepted for publication in RAA
Experimental and numerical investigation of silicon carbide and refractory materials under extreme conditions
Creators: name: Angelici Avincola, Valentina
Publisher: name: Karlsruhe
Year: 2016

description: The chemical and mechanical aspects related to the use of refractory materials at high-temperatures and under oxidizing conditions were investigated. The behavior of silicon carbide and tantalum were studied with an emphasis on their performance as fuel cladding in nuclear power plants.
Gamma Rays from the Tycho Supernova Remnant: Leptonic or Hadronic?
Creators: name: Atoyan, Armen
name: Dermer, Charles
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Recent Fermi and VERITAS observations of the prototypical Type Ia supernova remnant (SNR) Tycho have discovered gamma-rays with energies E in the range from ~0.4 GeV to 10 TeV. Crucial for the theory of Galactic cosmic-ray origin is whether the gamma-rays from SNRs are produced by accelerated hadrons (protons and ions), or by relativistic electrons. Here we show that the broadband radiation spectrum of Tycho can be explained within the framework of a two-zone leptonic model, which is likely to apply to every SNR. A model with hadrons can also fit the radiation spectrum. The hadronic origin of gamma-rays can be confirmed by Fermi spectral measurements of Tycho and other SNRs at energies below ~300 MeV.
description: 5 pages, 2 figures
Radiation pressure acting on the neutral He atoms in the Heliosphere
Creators: name: Kowalska-Leszczynska, Izabela
name: Kubiak, Marzena A.
name: Bzowski, Maciej
Publisher: name: arXiv
Year: 2023
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The Interstellar Neutral Helium (ISN He) is an important source of information on the physical state of the Local Interstellar Medium. Radiation pressure acting on the neutral helium atoms in the heliosphere has always been neglected, its effect has been considered insignificant compared to gravitational force. The most advanced numerical models of ISN He take into account more and more subtle effects, therefore it is important to check if the effect of radiation pressure is still negligible. In this paper, we use the most up-to-date version of the Warsaw Test Particle Model (WTPM) to calculate the expected helium distribution in the heliosphere, and simulate the flux of ISN He observed by the Interstellar Boundary Explorer (IBEX) and in the future by the Interstellar Mapping and Acceleration Probe (IMAP). We compare results calculated with and without radiation pressure during low and high solar activity. The results show that in the analysis of IBEX-Lo observations the radiation pressure acting on typical helium causes flux differences at a level of 1-4% and is comparable to the observational errors. For the more sensitive IMAP-Lo instrument, there are some regions in the considered observations configurations where radiation pressure causes potentially statistically significant changes in the calculated fluxes. The effect can be up to 9% for the indirect beam and is likely to be higher than the estimated errors. Therefore, we claim that in the future analysis of the IMAP-Lo observations radiation pressure acting on ISN He should be considered.
description: Accepted to ApJ
Oscillation mode linewidths of main-sequence and subgiant stars observed by Kepler
Creators: name: Appourchaux, T.
name: Benomar, O.
name: Gruberbauer, M.
name: Chaplin, W. J.
name: Garcia, R. A.
name: Handberg, R.
name: Verner, G. A.
name: Antia, H. M.
name: Campante, T. L.
name: Davies, G. R.
name: Deheuvels, S.
name: Hekker, S.
name: Howe, R.
name: Salabert, D.
name: Bedding, T. R.
name: White, T. R.
name: Houdek, G.
name: Aguirre, V. Silva
name: Elsworth, Y. P.
name: Van Cleve, J.
name: Clarke, B. D.
name: Hall, J. R.
name: Kjeldsen, H.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Solar-like oscillations have been observed by {\it Kepler} and CoRoT in several solar-type stars. We study the variations of stellar p-mode linewidth as a function of effective temperature. Time series of 9 months of Kepler data have been used. The power spectra of 42 cool main-sequence stars and subgiants have been analysed using both Maximum Likelihood Estimators and Bayesian estimators, providing individual mode characteristics such as frequencies, linewidths and mode heights. Here we report on the mode linewidth at maximum power and at maximum mode height for these 42 stars as a function of effective temperature. We show that the mode linewidth at either maximum mode height or maximum amplitude follows a scaling relation with effective temperature, which is a combination of a power law plus a lower bound. The typical power law index is about 13 for the linewidth derived from the maximum mode height, and about 16 for the linewidth derived from the maximum amplitude while the lower bound is about 0.3 microHz and 0.7 microHz, respectively. We stress that this scaling relation is only valid for the cool main-sequence stars and subgiants, and does not have predictive power outside the temperature range of these stars.
description: Accepted by A&A, 5 pages, 2 figures, 4 tables
Micro-tearing modes in the Mega Ampere Spherical Tokamak
Creators: name: Applegate, D J
name: Roach, C M
name: Connor, J W
name: Cowley, S C
name: Dorland, W
name: Hastie, R J
name: Joiner, N.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: Recent gyrokinetic stability calculations have revealed that the spherical tokamak is susceptible to tearing parity instabilities with length scales of a few ion Larmor radii perpendicular to the magnetic field lines. Here we investigate this 'micro-tearing' mode in greater detail to uncover its key characteristics, and compare it with existing theoretical models of the phenomenon. This has been accomplished using a full numerical solution of the linear gyrokinetic-Maxwell equations. Importantly, the instability is found to be driven by the free energy in the electron temperature gradient as described in the literature. However, our calculations suggest it is not substantially affected by either of the destabilising mechanisms proposed in previous theoretical models. Instead the instability is destabilised by interactions with magnetic drifts, and the electrostatic potential. Further calculations reveal that the mode is not significantly destabilised by the flux surface shaping or the large trapped particle fraction present in the spherical tokamak. Its prevalence in spherical tokamak plasmas is primarily due to the higher value of plasma β, and the enhanced magnetic drifts due to the smaller radius of curvature.
description: 12 pages, 12 figures
Luther and the Hussites: a problem in church unity
Creators: name: Clarke, Crofton Boyd
Publisher: name: University of Calgary
Year: 1973
Subjects: subject: BR 334.2 C52 1973 Microfiche
subject: Luther, Martin, 1483-1546
subject: Hus, Jan, 1369-1415
subject: Bohemia - History - 1402-1526

description: Bibliography: p. 106-112.
$K^-$ and $\bar p$ Spectra for Au+Au Collisions at $\sqrt{s}$ = 200 GeV from STAR, PHENIX and BRAHMS in Comparison to Core-Corona Model Predictions
Creators: name: Schreiber, C.
name: Werner, K.
name: Aichelin, J.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Nuclear Theory (nucl-th)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: Based on results obtained with event generators we have launched the core-corona model. It describes in a simplified way but quite successfully the centrality dependence of multiplicity and $$ of identified particles observed in heavy-ion reaction at beam energies between $\sqrt{s}$ = 17 GeV and 200 GeV. Also the centrality dependence of the elliptic flow, $v_2$, for all charged and identified particles could be explained in this model. Here we extend this analysis and study the centrality dependence of single particle spectra of $K^-$ and ${\bar p}$ measured by the PHENIX, STAR and BRAHMS collaborations. We find that also for these particles the analysis of the spectra in the core-corona model suffers from differences in the data published by the different experimental groups, notably for the pp collisions. As for protons and $K^+$ for each experience the data agree well with the prediction of the core-corona model but the value of the two necessary parameters depends on the experiments. We show as well that the average momentum as a function of the centrality depends in a very sensitive way on the particle species and may be quite different for particles which have about the same mass. Therefore the idea to interpret this centrality dependence as a consequence of a collective expansion of the system, as done in blast way fits may be premature.
description: Invited talk to the CPOD conference Dubna August 2010
The hazardous km-sized NEOs of the next thousands of years
Creators: name: Fuentes-Muñoz, Oscar
name: Scheeres, Daniel J.
name: Farnocchia, Davide
name: Park, Ryan S.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: The catalog of km-sized near-Earth objects (NEOs) is nearly complete. Typical impact monitoring analyses search for possible impacts over the next 100 years and none of the km-sized objects represent an impact threat over that time interval. Assessing the impact risk over longer time scales is a challenge since orbital uncertainties grow. To overcome this limitation we analyze the evolution of the Minimum Orbit Intersection Distance (MOID), which bounds the closest possible encounters between the asteroid and the Earth. The evolution of the MOID highlights NEOs that are in the vicinity of the Earth for longer periods of time, and we propose a method to estimate the probability of a deep Earth encounter during these periods. This metric is used to rank the km-sized catalog in terms of their long-term impact hazard to identify targets of potential interest for additional observation and exploration.
description: 20 pages, 17 figures, Accepted for Publication in The Astronomical Journal
Czechoslovakia's relations with Poland in the early years from 1918
Creators: name: Mirejovsky, Petr
Publisher: name: University of Calgary
Year: 1972
Subjects: subject: DB 205.8 P6 M55 1972 Microfilm
subject: Czechoslovakia - Foreign relations - Poland
subject: Poland - Foreign relations - Czechoslovakia
subject: Czechoslovakia - Relations (general) with Poland
subject: Czechoslovakia - History - 1918-1938

description: Bibliography: p. 110-114.
On the nature of the planet-powered transient event ZTF SLRN-2020
Creators: name: Soker, Noam
Publisher: name: arXiv
Year: 2023
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The Red Nova ZTF SLRN-2020 is the third transient event with properties that are compatible with the merger of a planet with a main sequence (or close to) star on a dynamical timescale. While the two first transient events occurred in young stellar objects, ZTF SLRN-2020 occurred in an old system. Nonetheless, I show that the three star-planet intermediate luminosity optical transients (ILOTs, also termed Red Novae) occupy the same area in the energy-time diagram of ILOTs. Based on models for ILOTs that are power by stellar binary interaction I suggest that the planet in ZTF SLRN-2020 launched jets at about its escape speed before it was engulfed by the star. Interestingly, the escape speed from the planet is similar to the orbital speed of the planet. This leads to an outflow with a very low terminal velocity, much below the escape velocity from the star, and in concentration around ~45 degrees to the equatorial plane. As well, the planet might have lost back some of the accreted mass just before engulfment, forming an accretion disk around the star. This disk might have launched jets during the main outburst of the event. The jets form a bipolar expanding nebula.
description: Accepted for publication in MNRAS Letters
Modeling seismic wave propagation and amplification in 1D/2D/3D linear and nonlinear unbounded media
Creators: name: Semblat, Jean-François
Publisher: name: arXiv
Year: 2011
Subjects: subject: Geophysics (physics.geo-ph)
subject: FOS: Physical sciences

description: To analyze seismic wave propagation in geological structures, it is possible to consider various numerical approaches: the finite difference method, the spectral element method, the boundary element method, the finite element method, the finite volume method, etc. All these methods have various advantages and drawbacks. The amplification of seismic waves in surface soil layers is mainly due to the velocity contrast between these layers and, possibly, to topographic effects around crests and hills. The influence of the geometry of alluvial basins on the amplification process is also know to be large. Nevertheless, strong heterogeneities and complex geometries are not easy to take into account with all numerical methods. 2D/3D models are needed in many situations and the efficiency/accuracy of the numerical methods in such cases is in question. Furthermore, the radiation conditions at infinity are not easy to handle with finite differences or finite/spectral elements whereas it is explicitely accounted in the Boundary Element Method. Various absorbing layer methods (e.g. F-PML, M-PML) were recently proposed to attenuate the spurious wave reflections especially in some difficult cases such as shallow numerical models or grazing incidences. Finally, strong earthquakes involve nonlinear effects in surficial soil layers. To model strong ground motion, it is thus necessary to consider the nonlinear dynamic behaviour of soils and simultaneously investigate seismic wave propagation in complex 2D/3D geological structures! Recent advances in numerical formulations and constitutive models in such complex situations are presented and discussed in this paper. A crucial issue is the availability of the field/laboratory data to feed and validate such models.
description: of International Journal Geomechanics (2010) 1-12