cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Unveiling the population of dual- and lensed- AGNs at sub-arcsec separations
Creators: name: Mannucci, Filippo
name: Pancino, Elena
name: Belfiore, Francesco
name: Cicone, Claudia
name: Ciurlo, Anna
name: Cresci, Giovanni
name: Lusso, Elisabeta
name: Marasco, Antonino
name: Marconi, Alessandro
name: Nardini, Emanuele
name: Pinna, Enrico
name: Severgnini, Paola
name: Saracco, Paolo
name: Tozzi, Giulia
name: Yeh, Sherry
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: All cosmological models of structure formation predict the existence of a widespread population of dual supermassive black holes in-spiralling inside their common host galaxy, eventually merging and giving rise to intense gravitational waves. These systems can be identified as dual AGNs at kilo parsec separations, but only very few have been confirmed at z>0.5. The appearance of multiple AGNs at small angular separations can also be due to gravitational lensing of single AGNs, which are themselves very important systems for many astrophysical topics. Here we present a novel technique, dubbed the Gaia Multipeak (GMP) method, to obtain large and reliable samples of dual/lensed AGN candidates with sub-arcsec separations by looking for AGNs showing multiple peaks in the light profiles observed by the Gaia satellite. All the GMP-selected sources with high resolution images (26 from the HST archive and 5 from dedicated adaptive-optics assisted imaging at the Large Binocular Telescope) show multiple components with sub-arcsec separation pointing toward a very high reliability of the method. By sampling separations down to ~2 kpc at z>1, this method allows us to probe the physical processes that drive the inspiralling of a pair of SMBHs inside a single galaxy.
description: Nature Astronomy (2022)
Multidisciplinary benchmarks of a conservative spectral solver for the nonlinear Boltzmann equation
Creators: name: Wilkie, George J.
name: Keßler, Torsten
name: Rjasanow, Sergej
Publisher: name: arXiv
Year: 2022
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: The Boltzmann equation describes the evolution of the phase-space probability distribution of classical particles under binary collisions. Approximations to it underlie the basis for several scholarly fields, including aerodynamics and plasma physics. While these approximations are appropriate in their respective domains, they can be violated in niche but diverse applications which require direct numerical solution of the original nonlinear Boltzmann equation. An expanded implementation of the Galerkin-Petrov conservative spectral algorithm is employed to study a wide variety of physical problems. Enabled by distributed precomputation, solutions of the spatially homogeneous Boltzmann equation can be achieved in seconds on modern personal hardware, while spatially-inhomogeneous problems are solvable in minutes. Several benchmarks against both analytic theoretical predictions and comparisons to other Boltzmann solvers are presented in the context of several domains including weakly ionized plasma, gaseous fluids, and atomic-plasma interaction.
description: 17 pages, 5 figures, 1 table
Fossils, evolution, and progress: origins and development of a philosophical and scientific debate in England
Creators: name: Ursillo, Leonardo
Publisher: name: Journal of Mediterranean Earth Sciences
Year: 2023

description: Since Darwin’s time, biologists and philosophers have debated the issue of progress. Today, the concept of ‘progress’ continues to define evolutionary discussions, even though the origins of the concept date back many years before the publication of Origin of Species (1859). At that time, the study of fossils, together with all those natural transformations imagined to have occurred in the history of life on Earth, provided proper occasions to reflect on evolutionary changes, which were frequently interpreted in terms of progress. An optimistic view of natural history could be justified by such interpretations of the fossil record, which related the development of life to the continuous improvement of living forms. Going back to the philosophical and scientific origins of this debate, we can explore the motivations behind this view of evolution as progress through a historical and interdisciplinary framework. Due to the breadth of the subject, this article (with a few exceptions) will only consider the philosophical and scientific debate about these topics in the English intellectual context. I will begin by showing how the study of nature in the early 19th century was often linked to a progressive interpretation of animal classification and fossil discoveries. I will show later how evolution became associated with the idea of progress through embryology, influencing the English debates on species development. In the third part, I will move away from the purely scientific context for a moment to highlight how the issue of progress did not only concern the natural sciences or theories on the natural history of species but was also a prevalent theme in the English intellectual and historiographical culture of 18th century. I will conclude with a discussion of how “progress” was increasingly popular in Darwin’s time (before he published The Origin of Species), also influencing creationist thinking and, naturally, Darwin himself.
description: Journal of Mediterranean Earth Sciences, Vol. 15 (2023): In progress
Minimax Regret for Cascading Bandits
Creators: name: Vial, Daniel
name: Sanghavi, Sujay
name: Shakkottai, Sanjay
name: Srikant, R.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Machine Learning (cs.LG)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences

description: Cascading bandits is a natural and popular model that frames the task of learning to rank from Bernoulli click feedback in a bandit setting. For the case of unstructured rewards, we prove matching upper and lower bounds for the problem-independent (i.e., gap-free) regret, both of which strictly improve the best known. A key observation is that the hard instances of this problem are those with small mean rewards, i.e., the small click-through rates that are most relevant in practice. Based on this, and the fact that small mean implies small variance for Bernoullis, our key technical result shows that variance-aware confidence sets derived from the Bernstein and Chernoff bounds lead to optimal algorithms (up to log terms), whereas Hoeffding-based algorithms suffer order-wise suboptimal regret. This sharply contrasts with the standard (non-cascading) bandit setting, where the variance-aware algorithms only improve constants. In light of this and as an additional contribution, we propose a variance-aware algorithm for the structured case of linear rewards and show its regret strictly improves the state-of-the-art.
Es bereitet sich eine furchtbare Reaktion vor! Ja, jetzt sehe ich die Reaktion. Früher sah der, welcher durch ein reines Glas sah, keine Reaktion; jetzt aber liegt sie klar vor!; [1848?]
Creators: name: (:Unav)
Publisher: name: Universitätsbibliothek der Ludwig-Maximilians-Universität München
Year: 2018

description: Vorlageform der Veröffentlichungsangabe: Lith Anst v Ed Gust May in Frankfurt aM
Observation of Longitudinal Spin Seebeck Effect with Various Transition Metal Films
Creators: name: Ishida, M.
name: Kirihara, A.
name: Someya, H.
name: Uchida, K.
name: Kohmoto, S.
name: Saitoh, E.
name: Murakami, T.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We evaluated the thermoelectric properties of longitudinal spin Seebeck devices by using ten different transition metals (TMs). Both the intensity and sign of spin Seebeck coefficients were noticeably dependent on the degree of the inverse spin Hall effect and the resistivity of each TM film. Spin dependent behaviors were also observed under ferromagnetic resonance. These results indicate that the output of the spin Seebeck devices originates in the spin current.
description: 14 pages, 4 figures
A new method for measurement of the Michel parameters that describe the daughter muon polarization in the $τ^- \to μ^- \barν_μν_τ$ decay
Creators: name: Bodrov, D.
name: Pakhlov, P.
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: This paper provides a detailed description of the method for the first direct measurement of all Michel parameters in the $τ^- \to μ^- \barν_μν_τ$ decay related to the polarization of the daughter muon. An application of the suggested method in the existing and future experiments at $e^+e^-$ colliders is considered. We have performed a feasibility study for the future Super Charm-Tau Factory and Belle II experiments. For the first one, the sensitivity to the Michel parameters $ξ'$, $ξ''$, $η''$, $α'/A$, and $β'/A$ is estimated. For the latter, only one Michel parameter, $ξ'$, for which the sensitivity is maximum, is considered.
description: 17 pages, 5 figures
Rigidity of three-dimensional internal waves with constant vorticity
Creators: name: Chen, Robin Ming
name: Fan, Lili
name: Walsh, Samuel
name: Wheeler, Miles H.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics

description: This paper studies the structural implications of constant vorticity for steady three-dimensional internal water waves. It is known that in many physical regimes, water waves beneath vacuum that have constant vorticity are necessarily two dimensional. The situation is more subtle for internal waves that traveling along the interface between two immiscible fluids. When the layers have the same density, there is a large class of explicit steady waves with constant vorticity that are three-dimensional in that the velocity field and pressure depend on one horizontal variable while the interface is an arbitrary function of the other. We prove the following rigidity result: every three-dimensional traveling internal wave with bounded velocity for which the vorticities in the upper and lower layers are nonzero, constant, and parallel must belong to this family. If the densities in each layer are distinct, then in fact the flow is fully two dimensional.
description: 12 pages, 2 figures
Generation and evaluation of multipartite entanglement with multi-rail encoding in linear optics networks
Creators: name: Wu, Jun-Yi
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A linear optics network is a multimode interferometer system, where indistinguishable photon inputs can create nonclassical interference that can not be simulated with classical computers. Such nonclassical interference implies the existence of entanglement among its subsystems, if we divide its modes into different parties. Entanglement in such systems is naturally encoded in multi-rail (multi-mode) quantum registers. For bipartite entanglement, a generation and detection scheme with multi-rail encoding has been theoretically proposed [NJP 19(10):103032, 2017] and experimentally realized [Optica, 7(11):1517, 2020]. In this paper, we will take a step further to establish a theory for the detection of multi-rail-encoded discrete-variable genuine multipartite entanglement (GME) in fixed local-photon-number subspaces of linear optics networks. We also propose a scheme for GME generation with both discrete-variable (single photons) and continuous-variable (squeezed states) light sources. This scheme allows us to reveal the discrete-variable GME in continuous-variable systems. The effect of photon losses is also numerically analyzed for the generation scheme based on continuous-variable inputs.
description: 9 pages, 5 figures
Gender and Entrepreneurship in Tourism: An Analysis of Tourism Graduates’ Entrepreneurial Profile
Creators: name: Costa, Carlos
name: Carvalho, Inês
name: Caçador, Sandra
name: Breda, Zélia
Publisher: name: Journal of Tourism & Development
Year: 2012

description: This paper aims to compare the entrepreneurial profile of female and male tourism graduates in Portugal, namely in what concerns their motivations to start a new business. The concepts of ‘necessity’ and ‘opportunity’ entrepreneurship are used. There is a higher proportion of male entrepreneurs than female entrepreneurs. Men are also more likely to be opportunity entrepreneurs than women. Moreover, there is an association between being an opportunity entrepreneur and an employer, whereas the proportion of necessity entrepreneurs is higher among independent workers. Salaries of opportunity entrepreneurs are also higher. There is also a positive relation between being an opportunity entrepreneur and one’s level of education. However, if the desire to start one’s own business is analysed, the proportion of men and women who would like to start their own business is very similar. Moreover, family life and having children seems to have a significant impact on men and women’s desire to start their own business.
description: Journal of Tourism & Development, vol. 2 n.º 17/18 (2012)
O contributo da animação turística nas empresas
Creators: name: Ramos, Elsa Maria Costa Ventura
name: Marques, Patrícia Isabel Silva
Publisher: name: Revista Turismo & Desenvolvimento
Year: 2012

description: O lazer e a animação turística têm uma ligação ideal. Pois através da animação turística as pessoas podem vivenciar experiências únicas que conseguem despertar reações muitas vezes impensáveis. As empresas recorrem à animação turística, como forma de presentearem os seus colaboradores, aproveitando estas experiências e convívios para incutir nestes, sentido de liderança, coesão grupal e, por que não, competitividade na sua equipa. Todo o projeto tem uma atividade intencional, como tal, este passa inicialmente pela contextualização teórica e prática referente às áreas de Animação Turística, Serviço Social e Psicologia Social. A sua realização pressupõe um objetivo, formulado pelas intervenientes: verificar em que medida, as dinâmicas de grupo criam um maior desenvolvimento pessoal e social dos participantes inseridos no mundo do trabalho. Os principais objetivos, temáticas, e variáveis moldam o projeto a desenvolver nos grupos de trabalho, convencionando a dinamização de atividades inovadoras que possam retratar as temáticas a observar, tais como: Liderança, Coesão grupal, Interação pessoal e Intergrupal e Tomada de decisão. A concretização destas variáveis tem por base a adoção de uma metodologia de investigação – ação, sendo que a investigação (diagnóstico de necessidades) será realizada através de checklist’s, observando e registando: comportamentos, decisões e opiniões dos participantes. No que respeita à avaliação, esta será elaborada através da observação direta, grelhas e relatórios de apreciação, que permitam concluir qual o comportamento e a opinião geral dos/as intervenientes.
description: Revista Turismo & Desenvolvimento, vol. 2 n.º 17/18 (2012)
Binary black hole mergers from merged stars in the Galactic field
Creators: name: Stegmann, Jakob
name: Antonini, Fabio
name: Schneider, Fabian R. N.
name: Tiwari, Vaibhav
name: Chattopadhyay, Debatri
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The majority of massive stars are found in close binaries which: (i) are prone to merge and (ii) are accompanied by another distant tertiary star (triples). Here, we study the evolution of the stellar post-merger binaries composed of the merger product and the tertiary companion. We find that post-merger binaries originating from compact stellar triples with outer semi-major axes $a_{\rm out,init}\lesssim10^1\,-\,10^2\,\rm AU$ provide a new way to form binary black hole mergers in the galactic field. By means of a population synthesis, we estimate their contribution to the total black hole merger rate to be $\mathcal{R}(z=0)=0.3\,-\,25.2\,\rm Gpc^{-3}\,yr^{-1}$. Merging binary black holes that form from stellar post-merger binaries have exceptionally low mass ratios. We identify a critical mass ratio $q\simeq0.5$ below which they dominate the total black hole merger rate in the field. We show that after including their additional contribution, the mass ratio distribution of binary black hole mergers in the galactic field scenario is in better agreement with that inferred from gravitational wave detections.
description: 12 pages, 6 Figures, 2 Tables, accepted for publication in PRD
Classification of gamma-ray targets for velocity-dependent and subhalo-boosted dark-matter annihilation
Creators: name: Lacroix, Thomas
name: Facchinetti, Gaétan
name: Pérez-Romero, Judit
name: Stref, Martin
name: Lavalle, Julien
name: Maurin, David
name: Sánchez-Conde, Miguel A.
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Gamma-ray observations have long been used to constrain the properties of dark matter (DM), with a strong focus on weakly interacting massive particles annihilating through velocity-independent processes. However, in the absence of clear-cut observational evidence for the simplest candidates, the interest of the community in more complex DM scenarios involving a velocity-dependent cross-section has been growing steadily over the past few years. We present the first systematic study of velocity-dependent DM annihilation (in particular $p$-wave annihilation and Sommerfeld enhancement) in a variety of astrophysical objects, not only including the well-studied Milky Way dwarf satellite galaxies, but nearby dwarf irregular galaxies and local galaxy clusters as well. Particular attention is given to the interplay between velocity dependence and DM halo substructure. Uncertainties related to halo mass, phase-space and substructure modelling are also discussed in this velocity-dependent context. We show that, for $s$-wave annihilation, extremely large subhalo boost factors are to be expected, up to $10^{11}$ in clusters and up to $10^6-10^7$ in dwarf galaxies where subhalos are usually assumed not to play an important role. Boost factors for $p$-wave annihilation are smaller but can still reach $10^3$ in clusters. The angular extension of the DM signal is also significantly impacted, with e.g. the cluster typical emission radius increasing by a factor of order 10 in the $s$-wave case. We also compute the signal contrast of the objects in our sample with respect to annihilation happening in the Milky Way halo. Overall, we find that the hierarchy between the brightest considered targets depends on the specific details of the assumed particle-physics model.
description: 52 pages, 10 figures. v3: minor changes, matches the published version
Free field realisation and the chiral universal centraliser
Creators: name: Beem, Christopher
name: Nair, Sujay
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: Quantum Algebra (math.QA)
subject: Representation Theory (math.RT)
subject: Symplectic Geometry (math.SG)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: In the TQFT formalism of Moore-Tachikawa for describing Higgs branches of theories of class $\mathcal{S}$, the space associated to the unpunctured sphere in type $\mathfrak{g}$ is the universal centraliser $\mathfrak{Z}_G$, where $\mathfrak{g}=Lie(G)$. In more physical terms, this space arises as the Coulomb branch of pure $\mathcal{N}=4$ gauge theory in three dimensions with gauge group $\check{G}$, the Langlands dual. In the analogous formalism for describing chiral algebras of class $\mathcal{S}$, the vertex algebra associated to the sphere has been dubbed the \emph{chiral universal centraliser}. In this paper, we construct an open, symplectic embedding from a cover of the Kostant-Toda lattice of type $\mathfrak{g}$ to the universal centraliser of $G$, extending a classic result of Kostant. Using this embedding and some observations on the Poisson algebraic structure of $\mathfrak{Z}_G$, we propose a free field realisation of the chiral universal centraliser for any simple group $G$. We exploit this realisation to develop free field realisations of chiral algebras of class $\mathcal{S}$ of type $\mathfrak{a}_1$ for theories of genus zero with up to six punctures. These realisations make generalised $S$-duality completely manifest, and the generalisation to more than six punctures is conceptually clear, though technically burdensome.
description: 50 pages, one appendix; v2 corresponds to journal version
Casal de' Pazzi, excavation notes
Creators: name: Ruffo, Massimo
name: Saracino, Barbara
name: Zanzi, Gian Luca
Publisher: name: Journal of Mediterranean Earth Sciences
Year: 2023

description: Forty years after the discovery of the prehistoric site of Casal de’ Pazzi, the protagonist of those “roaring” years has been repeatedly asked to recall the stories, hardships, and frustrations, but also the success of that historic excavation campaign. Indeed, that daring adventure, in an era when the Sovrintenza Archeologica di Roma was making its first attempts to control and protect the territory of Rome, marked an epoch. The importance of the site and its artifacts, highly regarded by the prehistoric official of the time, Anna Paola Anzidei, allowed for extensive excavations of a large portion of the deposit and subsequently established its conservation and protection. The collaboration between institutions then enabled the Capitolina Superintendence of Rome to carry out musealization interventions, which, thanks to the tremendous efforts of some experts in prehistory, transformed the archeological site into a nationally significant museum. In the text we summarize, through a direct and valuable testimony from one of the authors, the reconstruction of the history of the site and the initial research activities. It is a vivid and detailed narrative that reveals Massimo Ruffo’s deep involvement: memories, reflections, observations, self-criticism, and uncertainties are the underlying themes of these valuable notes. At the same time, through the description of methodological strategies and depositional processes, the intention is not only to inform but also to accompany the reader right during the excavation of that time, aiming to make them partake in the issues of the research that allowed us to contemplate today Casal de’ Pazzi’s preserved stretch of fluvial landscape, evidence of our deep past.
description: Journal of Mediterranean Earth Sciences, Vol. 15 (2023): In progress
title: Wenn Deutschland und Frankreich Arm in Arm gehen, dann können wir unser Jahrhundert in die Schranken rufen! (Bravo!); [1848?]
title: (d. 8. Juli, 1848)
titleType: Subtitle
Creators: name: (:Unav)
Publisher: name: Universitätsbibliothek der Ludwig-Maximilians-Universität München
Year: 2018

description: Vorlageform der Veröffentlichungsangabe: Verlag von J. B. Simon, in Frankfurt a/m.
Processo Empreendedor em Turismo: Estudo de Casos Múltiplos em Empresas Hoteleiras em Sergipe, Brasil
Creators: name: Teixeira, Rivanda Meira
Publisher: name: Revista Turismo & Desenvolvimento
Year: 2012

description: O objetivo deste estudo é analisar o processo empreendedor, adotando o modelo teórico de referência de Borges et al. (2005), que identifica os estágios e as atividades que ocorrem na criação de novos negócios. Os dados foram coletados através de entrevistas pessoais semi-estruturadas com quatro empreendedores de empresas hoteleiras de pequeno porte em Aracaju, recorrendo a um roteiro de entrevistas. O principal motivo para a criação do negócio foi aproveitar uma oportunidade percebida e, no estágio de preparação, constatou-se que, apesar do apoio gratuito oferecido pelo SEBRAE, os empresários iniciam seus empreendimentos sem realizar o plano de negócios ou pesquisa de mercado. No estágio de start-up, os empreendedores apontaram a morosidade e a burocracia como as maiores dificuldades para registro do negócio. No estágio de consolidação, observou-se que os hotéis ainda não atingiram o ponto de equilíbrio, mas as pousadas conseguiram obter lucro em quatro anos de funcionamento. Os empreendedores consideram que o negócio é compensador, no entanto, alguns destacam a baixa rentabilidade, o excesso de trabalho e a falta de incentivo do governo no apoio ao desenvolvimento das atividades turísticas do Estado.
description: Revista Turismo & Desenvolvimento, vol. 2 n.º 17/18 (2012)
Decoherence and classicalization of continuous-time quantum walks on graphs
Creators: name: Bressanini, Gabriele
name: Benedetti, Claudia
name: Paris, Matteo G. A.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We address decoherence and classicalization of continuous-time quantum walks (CTQWs) on graphs. In particular, we investigate three different models of decoherence, and employ the quantum-classical (QC) dynamical distance as a figure of merit to assess whether, and to which extent, decoherence classicalizes the CTQW, i.e. turns it into the analogue classical process. We show that the dynamics arising from intrinsic decoherence, i.e. dephasing in the energy basis, do not fully classicalize the walker and partially preserves quantum features. On the other hand, dephasing in the position basis, as described by the Haken-Strobl master equation or by the quantum stochastic walk (QSW) model, asymptotically destroys the quantumness of the walker, making it equivalent to a classical random walk. We also investigate the speed of the classicalization process, and observe a faster convergence of the QC-distance to its asymptotic value for intrinsic decoherence and the QSW models, whereas in the Haken-Strobl scenario, larger values of the decoherence rate induce localization of the walker.
description: 15 pages, 4 figures
Silicon isotopic abundance toward evolved stars and its application for presolar grains
Creators: name: Peng, T. -C.
name: Humphreys, E. M. L.
name: Testi, L.
name: Baudry, A.
name: Wittkowski, M.
name: Rawlings, M. G.
name: de Gregorio-Monsalvo, I.
name: Vlemmings, W.
name: Nyman, L. -A.
name: Gray, M. D.
name: de Breuck, C.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Galactic chemical evolution (GCE) is important for understanding the composition of the present-day interstellar medium (ISM) and of our solar system. In this paper, we aim to track the GCE by using the 29Si/30Si ratios in evolved stars and tentatively relate this to presolar grain composition. We used the APEX telescope to detect thermal SiO isotopologue emission toward four oxygen-rich M-type stars. Together with the data retrieved from the Herschel science archive and from the literature, we were able to obtain the 29Si/30Si ratios for a total of 15 evolved stars inferred from their optically thin 29SiO and 30SiO emission. These stars cover a range of masses and ages, and because they do not significantly alter 29Si/30Si during their lifetimes, they provide excellent probes of the ISM metallicity (or 29Si/30Si ratio) as a function of time. The 29Si/30Si ratios inferred from the thermal SiO emission tend to be lower toward low-mass oxygen-rich stars (e.g., down to about unity for W Hya), and close to an interstellar or solar value of 1.5 for the higher-mass carbon star IRC+10216 and two red supergiants. There is a tentative correlation between the 29Si/30Si ratios and the mass-loss rates of evolved stars, where we take the mass-loss rate as a proxy for the initial stellar mass or current stellar age. This is consistent with the different abundance ratios found in presolar grains. We found that older objects (up to possibly 10 Gyr old) in our sample trace a previous, lower 29Si/30Si value of about 1. Material with this isotopic ratio is present in two subclasses of presolar grains, providing independent evidence of the lower ratio. Therefore, the 29Si/30Si ratio derived from the SiO emission of evolved stars is a useful diagnostic tool for the study of the GCE and presolar grains.
description: 7 pages, 4 figures
Nonlinear switching in a concentric ring core chalcogenide glass optical fiber for passively mode-locking a fiber laser
Creators: name: Nazemosadat, Elham
name: Mafi, Arash
Publisher: name: arXiv
Year: 2014
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We propose an all-fiber mode-locking device which operates based on nonlinear switching in a novel concentric ring core fiber structure. The design is particularly attractive given the ease of fabrication and coupling to other components in a mode-locked fiber laser cavity. The nonlinear switching in this coupler is studied and the relative power transmission is obtained. The analysis shows that this nonlinear switch is practical for mode-locking fiber lasers and is forgiving to fabrication errors.
Factores que influenciam na criação de novos negócios: Estudo de casos múltiplos em Agências de Viagens em Aracaju
Creators: name: Teixeira, Rivanda Meira
name: Carvalho, Juliana Barbosa De
Publisher: name: Revista Turismo & Desenvolvimento
Year: 2012

description: O objetivo geral desse estudo foi analisar os fatores que influenciam a criação de novos empreendimentos no setor de turismo e, especificamente pretendeu: identificar o perfil do empreendedor no setor turístico em Aracaju, verificar as motivações dos empreendedores para criação de negócio no setor turístico, verificar se houve planejamento para a criação dos negócios, verificar se a experiência anterior do empreendedor influenciou nesse processo, verificar a influência da família, apontar as fontes de recursos utilizados para a abertura do negócio e examinar se houve apoio do setor público para a criação do negócio. Adotou-se a estratégia de pesquisa de estudo de casos múltiplos e foram analisados seis casos selecionados entre empresas turísticas localizadas em Aracaju, que foram criadas há pelo menos três anos e que os empreendedores estejam na gestão do negócio. Entre os resultados mais importantes verificou-se que vários fatores podem influenciar na criação de novos negócios do setor de turismo, mas entre eles merece destaque o alto nível de escolaridade dos empreendedores, o apoio da família e a experiência anterior na atividade. O que chama a atenção nos casos estudados é que, apesar de serem instruídos, os empreendedores não são preparados para a realização de planejamento ou para gerenciar os negócios o que demonstra fragilidade quando se atua em mercado cada vez mais competitivo.
description: Revista Turismo & Desenvolvimento, vol. 2 n.º 17/18 (2012)
Quantum Information Approach to the Implementation of a Neutron Cavity
Creators: name: Nahman-Lévesque, O.
name: Sarenac, D.
name: Cory, D. G.
name: Huber, M. G.
name: Pushin, D. A.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Using the quantum information model of dynamical diffraction we consider a neutron cavity composed of two perfect crystal silicon blades capable of containing the neutron wavefunction. We show that the internal confinement of the neutrons through Bragg diffraction can be modelled by a quantum random walk. Good agreement is found between the simulation and the experimental implementation. Analysis of the standing neutron waves is presented in regards to the crystal geometry and parameters; and the conditions required for well-defined bounces are derived. The presented results enable new approaches to studying the setups utilizing neutron confinement, such as the experiments to measure neutron magnetic and electric dipole moments.
description: 6 pages, 5 figures
Capture of Electroweak Multiplet Dark Matter in Neutron Stars
Creators: name: Fujiwara, Motoko
name: Hamaguchi, Koichi
name: Nagata, Natsumi
name: Zheng, Jiaming
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: If dark matter has a sizable scattering cross section with nucleons, it can efficiently be captured by a neutron star. Its energy is then transferred to the neutron star as heat through the scattering and annihilation inside the star. This heating effect may be detectable via dedicated temperature observations of nearby old pulsars, providing an alternative method for dark matter searches. In this paper, we show that for electroweak multiplet dark matter this search strategy can probe the parameter region which is out of reach of future dark matter direct detection experiments. To see this systematically, we classify such dark matter candidates in terms of their electroweak charges and investigate the effect of ultraviolet physics by means of higher-dimensional effective operators. We then show that if the effect of ultraviolet physics is sizable, the dark matter-nucleon elastic scattering cross section becomes sufficiently large, whilst if it is suppressed, then the mass splittings among the components of the DM multiplet get small enough so that the inelastic scattering processes are operative. In any case, the electroweak multiplet dark matter particles are efficiently captured in neutron stars, making the search strategy with the temperature observation of old neutron stars promising.
description: 33 pages, 7 figures, 1 table, the version published in PRD
Feasibility of a social network in Tourism Higher Education
Creators: name: Salgado, Manuel
name: Costa, Carlos
Publisher: name: Journal of Tourism & Development
Year: 2012

description: The following article analyses the organization network of Higher Education Institutions in the area of Tourism in Portugal and the interest in creating a social network in this field, which contributes to the cohesion and communication of this scientific community. As a result, the project “National Observatory of Tourism Education” is introduced, intending to build a technologic work platform, for this particular academic community, with the purpose of building an efficient and organized network, allowing the sharing of knowledge and relevant experiences at a national and regional level, generating added value that allows us to show the major role that education plays in Tourism. We also studied how we could use the social networks in behalf of the educational science, taking advantage of their particularities, in an effort to show how they are changing the face of modern Tourism, in order to justify the possible need to create a social network on Tourism in the Central Region.
description: Journal of Tourism & Development, vol. 1 n.º 17/18 (2012)
Riesz-Quincunx-UNet Variational Auto-Encoder for Satellite Image Denoising
Creators: name: Thai, Duy H.
name: Fei, Xiqi
name: Le, Minh Tri
name: Züfle, Andreas
name: Wessels, Konrad
Publisher: name: arXiv
Year: 2022
Subjects: subject: Image and Video Processing (eess.IV)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Machine Learning (cs.LG)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: Multiresolution deep learning approaches, such as the U-Net architecture, have achieved high performance in classifying and segmenting images. However, these approaches do not provide a latent image representation and cannot be used to decompose, denoise, and reconstruct image data. The U-Net and other convolutional neural network (CNNs) architectures commonly use pooling to enlarge the receptive field, which usually results in irreversible information loss. This study proposes to include a Riesz-Quincunx (RQ) wavelet transform, which combines 1) higher-order Riesz wavelet transform and 2) orthogonal Quincunx wavelets (which have both been used to reduce blur in medical images) inside the U-net architecture, to reduce noise in satellite images and their time-series. In the transformed feature space, we propose a variational approach to understand how random perturbations of the features affect the image to further reduce noise. Combining both approaches, we introduce a hybrid RQUNet-VAE scheme for image and time series decomposition used to reduce noise in satellite imagery. We present qualitative and quantitative experimental results that demonstrate that our proposed RQUNet-VAE was more effective at reducing noise in satellite imagery compared to other state-of-the-art methods. We also apply our scheme to several applications for multi-band satellite images, including: image denoising, image and time-series decomposition by diffusion and image segmentation.
description: Submitted to IEEE Transactions on Geoscience and Remote Sensing (TGRS)
Internacionalização da pesquisa brasileira em turismo
Creators: name: Leal, Sérgio Rodrigues
Publisher: name: Revista Turismo & Desenvolvimento
Year: 2012

description: O papel atual das universidades na sociedade é discutido com vista a estabelecer o cenário em que se encontra a pesquisa em turismo. Destaca-se, neste contexto, a importância que é dada à produção científica. Posteriormente, faz-se um debate sobre a internacionalização das universidades brasileiras e são apresentados os desafios e as oportunidades para a internacionalização da pesquisa brasileira em turismo. Segue-se a descrição da metodologia adotada para a realização do estudo empírico e a discussão dos resultados obtidos. Verificou-se que a pesquisa brasileira em turismo ainda é pouco conhecida pelos membros da comunidade acadêmica internacional, especialmente por aqueles que fazem parte do grupo lingüístico dominante. Observou-se, também, que a pesquisa em turismo no Brasil é vista como tendo baixa qualidade por este grupo e pelos acadêmicos estrangeiros de língua portuguesa. Por outro lado, os acadêmicos de língua espanhola possuem, em geral, uma percepção mais positiva sobre a pesquisa e os pesquisadores brasileiros da área. Espera-se que os acadêmicos brasileiros se sintam estimulados por este artigo para buscar a internacionalização da sua produção científica e, eventualmente, da sua carreira.
description: Revista Turismo & Desenvolvimento, vol. 1 n.º 17/18 (2012)
Report: A Model for Remote Parental Control System Using Smartphones
Creators: name: Kuppusamy, K. S.
name: Francis, Leena Mary
name: Aghila, G.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Computers and Society (cs.CY)
subject: Human-Computer Interaction (cs.HC)
subject: FOS: Computer and information sciences
subject: 68U35 Information systems

description: The mammoth growth in the information technology sector in terms of both quantity and pervasiveness has opened up a Pandora's Box of issues which are relevant in technical and social aspects. This paper attempts to address one of the critical issues among them which is concerned with the proper utilization of computer systems and mobile devices by children and teens. This paper proposes a model termed "RePort (Remote Parental Control System using Smartphones)" which is aimed towards monitoring the access behaviour of computers and smartphones in general and internet to be specific, by teens and children in a private environment. The model is built such that the access behaviour shall be monitored from a remote location with the help of smartphone devices. The access- characteristics are modelled using various parameters in four different layers of the model.The proposed model is validated with a prototype implementation in the Android platform for smartphones and as a background service for computer systems. Various experiments were conducted on the prototype implementation and results of the experiments validate the efficiency of the proposed model with respect to user's relevancy metric which is computed as 93.46%.
description: 12 Pages, 4 Figures
Constraining stellar population models - I. Age, metallicity, and abundance pattern compilation for Galactic globular clusters
Creators: name: Roediger, Joel C.
name: Courteau, Stephane
name: Graves, Genevieve
name: Schiavon, Ricardo
Publisher: name: arXiv
Year: 2013
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We present an extenstive literature compilation of age, metallicity, and chemical abundance pattern information for the 41 Galactic globular clusters (GGCs) studied by Schiavon et al. (2005). Our compilation constitutes a notable improvement over previous similar work, particularly in terms of chemical abundances. Its primary purpose is to enable detailed evaluations of and refinements to stellar population synthesis models designed to recover the above information for unresolved stellar systems based on their integrated spectra. However, since the Schiavon sample spans a wide range of the known GGC parameter space, our compilation may also benefit investigations related to a variety of astrophysical endeavours, such as the early formation of the Milky Way, the chemical evolution of GGCs, and stellar evolution and nucleosynthesis. For instance, we confirm with our compiled data that the GGC system has a bimodal metallicity distribution and is uniformly enhanced in the alpha-elements. When paired with the ages of our clusters, we find evidence that supports a scenario whereby the Milky Way obtained its globular clusters through two channels, in situ formation and accretion of satellite galaxies. The distributions of C, N, O, and Na abundances and the dispersions thereof per cluster corroborate the known fact that all GGCs studied so far with respect to multiple stellar populations have been found to harbour them. Finally, using data on individual stars, we also confirm that the atmospheres of stars become progressively polluted by CN(O)-processed material after they leave the main sequence and uncover evidence which suggests the alpha-elements Mg and Ca may originate from more than one nucleosynthetic production site. [abridged]
description: 75 pages, 11 figures, 5 tables; accepted for publication in ApJS
Some multifaceted aspects of mathematical physics, our common denominator with Elliott Lieb
Creators: name: Sternheimer, Daniel
Publisher: name: arXiv
Year: 2022
Subjects: subject: History and Overview (math.HO)
subject: Mathematical Physics (math-ph)
subject: History and Philosophy of Physics (physics.hist-ph)
subject: Physics and Society (physics.soc-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 01A99, 01A85, 01A80, 00A79, 00A30, 03F40

description: Mathematical physics has many facets, of which we shall briefly give a (very partial) description, centered around those of main interest for Elliott and us (Moshe Flato and I). In our case these aspects had as a corollary a variety of "parascientific activities", in particular the foundation of IAMP (the International Association of Mathematical Physics) and of the journal LMP (Letters in Mathematical Physics), both of which were strongly impacted by Elliott, and Elliott's long insistence that publishers do not demand "copyright transfer" as a precondition for publication but are satisfied with "consent to publish", which is increasingly becoming standard. Since this article is testimony to the huge scientific impact of Elliott, the latter intertwined aspects constitute the core of the present contribution. The last part deals briefly with metaphysical and metamathematical considerations related to axioms.
description: 12 pages, third version (October 2022) of our paper dedicated to our friend Elliott Lieb on the occasion of the ninetieth anniversary of his birth. Some additions in the first two sections, a new "metamathematical" Section 3, and journal reference added
Turismo na escola: novas alternativas de sensibilização e envolvimento de educadores na elaboração de práticas inclusivas (re)conhecimento e (re)valorização sócio- -cultural em cidades turísticas
Creators: name: Alves, Kerley Dos Santos
name: Amorim, Kenia S. A.
name: Guilherme, Marcio Da Luz
Publisher: name: Revista Turismo & Desenvolvimento
Year: 2012

description: Os paradigmas das ciências sociais enfatizam a necessidade de uma aprendizagem permanente para despertar a capacidade crítica e o resgate da cidadania. Ao educador, cujos ideais de ensino extrapolam o ambiente tradicional da sala de aula, surge um caminho possível: o Turismo na dinâmica da escola. Assim, o trabalho educativo torna-se protagonista no desenvolvimento do turismo sustentável. Nesse sentido, consideram-se os interesses e valores, a vivência real e a percepção de alunos e professores em relação à comunidade em que estão inseridos. Baseado nas concepções da metodologia participativa e temas como, turismo, educação ambiental, patrimônio e consumo sustentável, o projeto “Turismo Pedagógico: uma porta para a inclusão” visou os objetivos: promover, em conjunto com instituições públicas, a sensibilização e formação de professores em educação ambiental e turismo nas escolas, a partir da experiência sensorial e do roteiro Sentidos Urbanos – IPHAN1. Como resultado cabe ressaltar que é uma proposta que ganha contornos diferentes, face à contextualização de cada escola,de acordo com os valores e práticas de cada lugar e em sintonia com as novas demandas sociais, para o enfrentamento da complexidade que caracteriza o contexto turístico atual, no que diz respeito à inclusão e valorização da cultura local.
description: Revista Turismo & Desenvolvimento, vol. 1 n.º 17/18 (2012)
Archangel: A Hybrid UAV-based Human Detection Benchmark with Position and Pose Metadata
Creators: name: Shen, Yi-Ting
name: Lee, Yaesop
name: Kwon, Heesung
name: Conover, Damon M.
name: Bhattacharyya, Shuvra S.
name: Vale, Nikolas
name: Gray, Joshua D.
name: Leong, G. Jeremy
name: Evensen, Kenneth
name: Skirlo, Frank
Publisher: name: arXiv
Year: 2022
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: Learning to detect objects, such as humans, in imagery captured by an unmanned aerial vehicle (UAV) usually suffers from tremendous variations caused by the UAV's position towards the objects. In addition, existing UAV-based benchmark datasets do not provide adequate dataset metadata, which is essential for precise model diagnosis and learning features invariant to those variations. In this paper, we introduce Archangel, the first UAV-based object detection dataset composed of real and synthetic subsets captured with similar imagining conditions and UAV position and object pose metadata. A series of experiments are carefully designed with a state-of-the-art object detector to demonstrate the benefits of leveraging the metadata during model evaluation. Moreover, several crucial insights involving both real and synthetic data during model optimization are presented. In the end, we discuss the advantages, limitations, and future directions regarding Archangel to highlight its distinct value for the broader machine learning community.
description: IEEE Access