cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Self-gravitating stationary spherically symmetric systems in relativistic galactic dynamics
Creators: name: Fjällborg, Mikael
name: Heinzle, J. Mark
name: Uggla, Claes
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We study equilibrium states in relativistic galactic dynamics which are described by solutions of the Einstein-Vlasov system for collisionless matter. We recast the equations into a regular three-dimensional system of autonomous first order ordinary differential equations on a bounded state space. Based on a dynamical systems analysis we derive new theorems that guarantee that the steady state solutions have finite radii and masses.
description: 25 pages, 1 figure
An efficient mapped WENO scheme using approximate constant mapping
Creators: name: Li, Ruo
name: Zhong, Wei
Publisher: name: arXiv
Year: 2021
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics

description: We present a novel mapping approach for WENO schemes through the use of an approximate constant mapping function which is constructed by employing an approximation of the classic signum function. The new approximate constant mapping function is designed to meet the overall criteria for a proper mapping function required in the design of the WENO-PM6 scheme. The WENO-PM6 scheme was proposed to overcome the potential loss of accuracy of the WENO-M scheme which was developed to recover the optimal convergence order of the WENO-JS scheme at critical points. Our new mapped WENO scheme, denoted as WENO-ACM, maintains almost all advantages of the WENO-PM6 scheme, including low dissipation and high resolution, while decreases the number of mathematical operations remarkably in every mapping process leading to a significant improvement of efficiency. The convergence rates of the WENO-ACM scheme have been shown through one-dimensional linear advection equation with various initial conditions. Numerical results of one-dimensional Euler equations for the Riemann problems, the Mach 3 shock-density wave interaction and the Woodward-Colella interacting blastwaves are improved in comparison with the results obtained by the WENO-JS, WENO-M and WENO-PM6 schemes. Numerical experiments with two-dimensional problems as the 2D Riemann problem, the shock-vortex interaction, the 2D explosion problem, the double Mach reflection and the forward-facing step problem modeled via the two dimensional Euler equations have been conducted to demonstrate the high resolution and the effectiveness of the WENO-ACM scheme. The WENO-ACM scheme provides significantly better resolution than the WENO-M scheme and slightly better resolution than the WENO-PM6 scheme, and compared to the WENO-M and WENO-PM6 schemes, the extra computational cost is reduced by more than 83% and 93%, respectively.
Διερεύνηση και μελέτη συνθηκών καλλιέργειας του δίθυρου μαλακίου Modiolus barbatus
Creators: name: Χαχόλας, Χριστόδουλος Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Δίθυρα μαλάκια
Modiolus barbatus
Καλλιέργεια
Bivalve mollusc
Aquaculture

description: Οι υδατοκαλλιέργειες αποτελούν αναπόσπαστο κομμάτι στον κλάδο των τροφίμων, τόσο από οικονομικής άποψης όσο και παραγωγικά. Λόγω της ραγδαίας αύξησης του κλάδου των υδατοκαλλιεργειών, παγκοσμίως γίνονται πολλές έρευνες που αφορούν την βιωσιμότητα αυτών, την συσχέτιση του κλάδου με το περιβάλλον και φυσικά αποδοτικότερες μεθόδους παραγωγής και προσπάθειες εκτροφής και καλλιέργειας νέων ειδών. Στα πλαίσια της παρούσας εργασίας σχεδιάστηκαν και πραγματοποιήθηκαν πειράματα και μετρήσεις που αφορούν την ενδεχόμενη δυνατότητα καλλιέργειας του είδους Modiolus barbatus και μεθόδους διαχείρισης του συγκεκριμένου είδους στον Θερμαϊκό κόλπο.
description: Aquaculture is an integral part of the food industry, both economically and productively. Due to the rapid growth of the aquaculture industry, many researches concerning its sustainability, its correlation with the environment and, of course, more efficient production methods and breeding and cultivation efforts of new species are being done worldwide. In the present study, experiments and measurements have been designed and carried out regarding the possible cultivation of Modiolus barbatus and methods of management of the species in the Thermaic Gulf.
Effect of cellular rearrangement time delays on the rheology of vertex models for confluent tissues
Creators: name: Erdemci-Tandogan, Gonca
name: Manning, M. Lisa
Publisher: name: arXiv
Year: 2021
Subjects: subject: Biological Physics (physics.bio-ph)
subject: Soft Condensed Matter (cond-mat.soft)
subject: Cell Behavior (q-bio.CB)
subject: Tissues and Organs (q-bio.TO)
subject: FOS: Physical sciences
subject: FOS: Biological sciences

description: Large-scale tissue deformation during biological processes such as morphogenesis requires cellular rearrangements. The simplest rearrangement in confluent cellular monolayers involves neighbor exchanges among four cells, called a T1 transition, in analogy to foams. But unlike foams, cells must execute a sequence of molecular processes, such as endocytosis of adhesion molecules, to complete a T1 transition. Such processes could take a long time compared to other timescales in the tissue. In this work, we incorporate this idea by augmenting vertex models to require a fixed, finite time for T1 transitions, which we call the "T1 delay time". We study how variations in T1 delay time affect tissue mechanics, by quantifying the relaxation time of tissues in the presence of T1 delays and comparing that to the cell-shape based timescale that characterizes fluidity in the absence of any T1 delays. We show that the molecular-scale T1 delay timescale dominates over the cell shape-scale collective response timescale when the T1 delay time is the larger of the two. We extend this analysis to tissues that become anisotropic under convergent extension, finding similar results. Moreover, we find that increasing the T1 delay time increases the percentage of higher-fold coordinated vertices and rosettes, and decreases the overall number of successful T1s, contributing to a more elastic-like -- and less fluid-like -- tissue response. Our work suggests that molecular mechanisms that act as a brake on T1 transitions could stiffen global tissue mechanics and enhance rosette formation during morphogenesis.
Thermodynamic limit of Nekrasov partition function for 5-brane web with O5-plane
Creators: name: Li, Xiaobin
name: Yagi, Futoshi
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: In this paper, we study 5d $\mathcal{N}=1$ $Sp(N)$ gauge theory with $N_f ( \leq 2N + 3 )$ flavors based on 5-brane web diagram with $O5$-plane. On the one hand, we discuss Seiberg-Witten curve based on the dual graph of the 5-brane web with $O5$-plane. On the other hand, we compute the Nekrasov partition function based on the topological vertex formalism with $O5$-plane. Rewriting it in terms of profile functions, we obtain the saddle point equation for the profile function after taking thermodynamic limit. By introducing the resolvent, we derive the Seiberg-Witten curve and its boundary conditions as well as its relation to the prepotential in terms of the cycle integrals. They coincide with those directly obtained from the dual graph of the 5-brane web with $O5$-plane. This agreement gives further evidence for mirror symmetry which relates Nekrasov partition function with Seiberg-Witten curve in the case with orientifold plane and shed light on the non-toric Calabi-Yau 3-folds including D-type singularities.
description: v1:60 pages, 22 figures, v2: 67 pages, 26 figures, a new subsection and an appendix added
Stationary states in a potential well
Creators: name: Rosu, H. C.
name: Moran-Lopez, J. L.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We review here in a historical context the topic of stationary states in the quantum world, including the generalization to the primary ideas. We also discuss the stationary states in one dimensional parabolic wells and the three dimensional Coulomb and parabolic cases, as well as the stationary bound states in the continuum
description: 40 pages, 9 figures, prepared as a book chapter, last section on BICs could be not only of historic interest
Large deviations for the Skew-Detailed-Balance Lifted-Markov processes to sample the equilibrium distribution of the Curie-Weiss model
Creators: name: Monthus, Cecile
Publisher: name: arXiv
Year: 2021
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: Among the Markov chains breaking detailed-balance that have been proposed in the field of Monte-Carlo sampling in order to accelerate the convergence towards the steady state with respect to the detailed-balance dynamics, the idea of 'Lifting' consists in duplicating the configuration space into two copies $σ=\pm$ and in imposing directed flows in each copy in order to explore the configuration space more efficiently. The skew-detailed-balance Lifted-Markov-chain introduced by K. S. Turitsyn, M. Chertkov and M. Vucelja [Physica D Nonlinear Phenomena 240 , 410 (2011)] is revisited for the Curie-Weiss mean-field ferromagnetic model, where the dynamics for the magnetization is closed. The large deviations at various levels for empirical time-averaged observables are analyzed and compared with their detailed-balance counterparts, both for the discrete extensive magnetization $M$ and for the continuous intensive magnetization $m=\frac{M}{N}$ for large system-size $N$.
description: v3=final version (40 pages); v2=revised version (39 pages) : reorganization into a shorter text and five appendices
Visual/infrared interferometry of Orion Trapezium stars: Preliminary dynamical orbit and aperture synthesis imaging of the Theta 1 Orionis C system
Creators: name: Kraus, S.
name: Balega, Y. Y.
name: Berger, J. -P.
name: Hofmann, K. -H.
name: Millan-Gabet, R.
name: Monnier, J. D.
name: Ohnaka, K.
name: Pedretti, E.
name: Preibisch, Th.
name: Schertl, D.
name: Schloerb, F. P.
name: Traub, W. A.
name: Weigelt, G.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Located in the Orion Trapezium cluster, Theta 1 Orionis C is one of the youngest and nearest high-mass stars (O5-O7) and also known to be a close binary system. Using new multi-epoch visual and near-infrared bispectrum speckle interferometric observations obtained at the BTA 6 m telescope, and IOTA near-infrared long-baseline interferometry, we trace the orbital motion of the Theta 1 Ori C components over the interval 1997.8 to 2005.9, covering a significant arc of the orbit. Besides fitting the relative position and the flux ratio, we apply aperture synthesis techniques to our IOTA data to reconstruct a model-independent image of the Theta 1 Ori C binary system. The orbital solutions suggest a high eccentricity (e approx. 0.91) and short-period (P approx. 10.9 yrs) orbit. As the current astrometric data only allows rather weak constraints on the total dynamical mass, we present the two best-fit orbits. From these orbital solutions one can be favoured, implying a system mass of 48 M_sun and a distance to the Trapezium cluster of 434 pc. When also taking the measured flux ratio and the derived location in the HR-diagram into account, we find good agreement for all observables, assuming a spectral type of O5.5 for Theta 1 Ori C1 (M=34.0 M_sun) and O9.5 for C2 (M=15.5 M_sun). We find indications that the companion C2 is massive itself, which makes it likely that its contribution to the intense UV radiation field of the Trapezium cluster is non-negligible. Furthermore, the high eccentricity of the preliminary orbit solution predicts a very small physical separation during periastron passage (approx. 1.5 AU, next passage around 2007.5), suggesting strong wind-wind interaction between the two O stars.
description: 13 pages, 9 figures, Accepted for publication in Astronomy & Astrophysics
A New Large-Number Coincidence and a Scaling Law for the Cosmological Constant
Creators: name: Funkhouser, Scott
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Physics (physics.gen-ph)
subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: An ensemble of pure numbers of order near 10^122 is produced naturally from the fundamental parameters of modern cosmology. This new large-number coincidence problem is resolved by demonstrating implicit physical connections that follow from the standard cosmological model. However, the occurrence of the new large-number coincidence combined with the known coincidence among pure numbers of order near 10^40 poses a distinct problem that is resolved with a scaling law for the cosmological constant that was originally proposed by Zel'dovich.
description: 8 pages, no figs; Accepted for publication in PRSA; http://www.nature.com/news/2008/080220/full/news.2008.610.html
Rieger-type periodicity in total irradiance of the Sun as a star
Creators: name: Gurgenashvili, Eka
Publisher: name: Zenodo
Year: 2021
Subjects: The Sun and the Heliosphere

description: Rieger type periodicity is a mid-range periodicity of 150-200 days in solar activity (Rieger et al. 1984). The periodicity can be found in many solar activity indices. Total solar irradiance permits Sun as a star to study stellar light curves from recent space missions. We study periodic variations of total solar irradiance (TSI) based on SATIRE-S and SOHO/VIRGO data during solar cycles 23-24 on time scales of Rieger-type periodicity. We then compare the power spectrum of oscillations in total solar irradiance to those of sunspot and faculae data to determine their contributions.
Using statistical methods to investigate the kinematic and spatial history of star clusters.
Creators: name: Arnold, Becky
name: Wright, Nick
Publisher: name: Zenodo
Year: 2021
Subjects: Stellar systems, clusters, and associations
Stellar dynamics
Statistical methods

description: The dynamical history of young star forming regions is a difficult thing to study because kinematic structure is quickly erased as the regions evolve. We explore the application of the Moran's I statistic to look for kinematic signatures of this initial structure which persist. The ability to diagnose a cluster's evolutionary origins and history would be a powerful tool in distinguishing which models of star formation best reflect reality.
description: {"references": ["Portegies Zwart et al. (1999) Star cluster ecology. III. Runaway collisions in young compact star clusters", "Portegies Zwart et al. (2001) Star cluster ecology - IV. Dissection of an open star cluster: photometry"]}
Neutrino-electron magnetohydrodynamics in an expanding Universe
Creators: name: Perrone, L. M.
name: Gregori, G.
name: Reville, B.
name: Silva, L. O.
name: Bingham, R.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We derive a new model for neutrino-plasma interactions in an expanding universe that incorporates the collective effects of the neutrinos on the plasma constituents. We start from the kinetic description of a multi-species plasma in the flat Friedmann-Robertson-Walker metric, where the particles are coupled to neutrinos through the charged- and neutral-current forms of the weak interaction. We then derive the fluid equations and specialize our model to (a) the lepton epoch, where we consider a pair electron-positron plasma interacting with electron (anti-)neutrinos, and (b) after the electron-positron annihilation, where we model an electron-proton plasma and take the limit of slow ions and inertia-less electrons to obtain a set of neutrino-electron magnetohydrodynamics (NEMHD) equations. In both models, the dynamics of the plasma is affected by the neutrino motion through a ponderomotive force and, as a result, new terms appear in the induction equation that can act as a source for magnetic field generation in the early universe. A brief discussion on the possible applications of our model is proposed.
description: 12 pages, 1 figure, submitted to Physical Review D; typos corrected, references added, added discussion on primordial magnetogenesis, accepted for publication in Physical Review D
Impurity effects in antiferromagnetic quantum spin-1/2 chains
Creators: name: Eggert, Sebastian
Publisher: name: University of British Columbia
Year: 2009

description: We calculate the effects of a single impurity in antiferromagnetic quantum spin-1/2 chains with the help of one-dimensional quantum field theory and renormalization group tech niques in the low temperature limit. We are able to present numerical evidence from ex act diagonalization, numerical Bethe ansatz, and quantum Monte Carlo methods, which support our findings. Special emphasis has been put on impurity effects on the local susceptibility in the chain, because of the experimental relevance of this quantity. We propose a muon spin resonance experiment on quasi one-dimensional spin compounds, which may show some of the impurity effects.
Structure and stability of two-dimensional Bose-Einstein condensates under both harmonic and lattice confinement
Creators: name: Law, K. J. H.
name: Kevrekidis, P. G.
name: Anderson, B. P.
name: Carretero-Gonzalez, R.
name: Frantzeskakis, D. J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: In this work, we study pancake-shaped Bose-Einstein condensates confined by both a cylindrically symmetric harmonic potential and an optical lattice with equal periodicity in two orthogonal directions. We first identify the spectrum of the underlying two-dimensional linear problem through multiple-scale techniques. Then, we use the results obtained in the linear limit as a starting point for a nonlinear existence and stability analysis of the lowest energy states, emanating from the linear ones, in the nonlinear problem. Two-parameter continuations of these states are performed for increasing nonlinearity and optical lattice strengths, and their instabilities and temporal evolution are investigated. It is found that the ground state as well as one of the excited states are either stable or weakly unstable for both attractive and repulsive interatomic interactions.
Development and validation of chemometrics-assisted spectrophotometric method for determination of clotrimazole in the presence of betamethasone valerate
Creators: name: C.M. Phechkrajang
name: W. Siriratawan
name: K. Narapanich
name: K. Thanomchat
name: P. Kantanawat
name: W. Srikajhondei
name: V. Khajornvanitchot
name: K. Sakchaisri
Publisher: name: Faculty of Pharmacy, Mahidol University
Year: 2015
Subjects: Clotrimazole,Betamethasone,PLS-1

description: 1, 42, Mahidol University Journal of Pharmaceutical Sciences
350 Micron Observations of Ultraluminous Infrared Galaxies at Intermediate Redshifts
Creators: name: Yang, M.
name: Greve, T. R.
name: Dowell, C. D.
name: Borys, C.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present 350micron observations of 36 ultraluminous infrared galaxies (ULIRGs) at intermediate redshifts (0.089 <= z <= 0.926) using the Submillimeter High Angular Resolution Camera II (SHARC-II) on the Caltech Submillimeter Observatory (CSO). In total, 28 sources are detected at S/N >= 3, providing the first flux measurements longward of 100micron for a statistically significant sample of ULIRGs in the redshift range of 0.1 < z < 1.0. Combining our 350micron flux measurements with the existing IRAS 60 and 100micron data, we fit a single-temperature model to the spectral energy distribution (SED), and thereby estimate dust temperatures and far-IR luminosities. Assuming an emissivity index of beta = 1.5, we find a median dust temperature and far-IR luminosity of Td = 42.8+-7.1K and log(Lfir/Lsolar) = 12.2+-0.5, respectively. The far-IR/radio correlation observed in local star-forming galaxies is found to hold for ULIRGs in the redshift range 0.1 < z < 0.5, suggesting that the dust in these sources is predominantly heated by starbursts. We compare the far-IR luminosities and dust temperatures derived for dusty galaxy samples at low and high redshifts with our sample of ULIRGs at intermediate redshift. A general Lfir-Td relation is observed, albeit with significant scatter, due to differing selection effects and variations in dust mass and grain properties. The relatively high dust temperatures observed for our sample compared to that of high-z submillimeter-selected starbursts with similar far-IR luminosities suggest that the dominant star formation in ULIRGs at moderate redshifts takes place on smaller spatial scales than at higher redshifts.
description: (24 pages in preprint format, 1 table, 7 figures, accepted for publication in ApJ)
Entanglement spreading after local and extended excitations in a free-fermion chain
Creators: name: Eisler, Viktor
Publisher: name: arXiv
Year: 2021
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study the time evolution of entanglement created by local or extended excitations upon the ground state of a free-fermion chain. A single particle or hole excitation produces a single bit of excess entropy for large times and subsystem lengths. In case of a double hole, some of the coherence between the excitations is preserved and the excess entropy becomes additive only for large hole separations. In contrast, the coherence is always lost for particle-hole excitations. Multiple hole excitations on a completely filled chain are also investigated. We find that for an extended contiguous hole the excess entropy scales logarithmically with the size, whereas the increase is linear for finite separations between the holes.
description: 24 pages, 9 figures, small changes, published version
Poster for CS20.5: HELIOSEISMIC INVESTIGATIONS OF THE QUASI-BIENNIAL OSCILLATION
Creators: name: Mehta, Tishtrya
name: Broomhall, Anne-Marie
name: Jain, Kiran
name: Tripathy, Sushant
name: Keifer, René
name: Kolotkov, Dmitrii Y.
Publisher: name: Zenodo
Year: 2021
Subjects: The Sun and the Heliosphere
Helioseismology

description: We investigate the behaviour of the Quasi-Biennial Oscillation (QBO) over solar Cycles 23 and 24, making use of helioseismic techniques. Using data from GONG and MDI/HMI, we see evidence of the QBO in frequency shifts of intermediate degree p-modes. By analysing the frequencies and lower turning points of these modes, we may better confine where the magnetic field driving the QBO is located. We find that evidence of the QBO exists over all frequencies and lower turning points across the full input data range (1600-4000 µHz, 0.2-1 solar radii) suggesting that the magnetic field generating the QBO must be anchored in the near surface layer. The periodicity of the QBO is roughly seen to be between 400-800 days through both Cycles 23 and 24, although its presence is weaker in Cycle 24. This data was analysed using AuTomated Empirical Mode Decomposition (ATEMD), a technique adept at extracting quasi-oscillatory signals.
description: {"references": ["A.-M. Broomhall, Solar Physics, 292 (4) 67, (2017)", "R. Simoniello\u00a0et al\u00a0ApJ\u00a0765\u00a0100 (2013)", "D. Kolotkov A&A 592, A153 (2016)"]}
Algebraic recognizability of regular tree languages
Creators: name: Esik, Zoltan
name: Weil, Pascal
Publisher: name: arXiv
Year: 2006
Subjects: subject: Discrete Mathematics (cs.DM)
subject: FOS: Computer and information sciences

description: We propose a new algebraic framework to discuss and classify recognizable tree languages, and to characterize interesting classes of such languages. Our algebraic tool, called preclones, encompasses the classical notion of syntactic Sigma-algebra or minimal tree automaton, but adds new expressivity to it. The main result in this paper is a variety theorem à la Eilenberg, but we also discuss important examples of logically defined classes of recognizable tree languages, whose characterization and decidability was established in recent papers (by Benedikt and Ségoufin, and by Bojanczyk and Walukiewicz) and can be naturally formulated in terms of pseudovarieties of preclones. Finally, this paper constitutes the foundation for another paper by the same authors, where first-order definable tree languages receive an algebraic characterization.
Low-mass eclipsing binaries in TESS and CRÉME
Creators: name: Hełminiak, Krzysztof
name: Jordan, Andres
name: Brahm, Rafael
name: Espinoza, Nestor
Publisher: name: Zenodo
Year: 2021
Subjects: Cool Stars on the main sequence

description: Magnetic fields in low-mass (<0.8 Mʘ) stars affect the fundamental stellar properties. In short-period, tidally locked binaries fast rotation of components strengthens the magnetic field through a form of a dynamo mechanism, enhances activity, and affects the observed radii and effective temperatures, which has been observed in low-mass detached eclipsing binaries (LMDEB) for decades. Several descriptions of this phenomenon have been proposed, but we lack good quality observational data and models of LMDEBs in order to validate or falsify them.
 We present high-precision light curves of several M- and K-type, active detached eclipsing binaries, recorded with 2-minute cadence by the Transiting Exoplanet Survey Satellite (TESS). Analysis of these curves, combined radial velocity (RV) data from literature and the CRÉME survey, allows to vastly improve the accuracy and precision of stellar parameters with respect to previous studies of these systems. Results for one previously unpublished DEB are also presented.
description: {"references": ["He\u0142miniak, Krzysztof G. et al. (2011) A&A, 527, A14", "He\u0142miniak, Krzysztof G. et al. (2012) MNRAS, 425, 1245", "He\u0142miniak, Krzysztof G. et al.( 2014) A&A, 567, A64", "R\u00f3\u017cyczka, Micha\u0142 et al. (2013), MNRAS, 429, 1840", "Southworth, John et al. (2004) MNRAS, 351, 1277", "Zucker, Shay & Mazeh, Tsevi (1994) ApJ, 420, 806"]}
The Curious Case of Betelgeuse
Creators: name: Granzer, Thomas
name: Weber, Michael
name: Strassmeier, Klaus G.
name: Dupree, Andrea
Publisher: name: Zenodo
Year: 2021
Subjects: Post main sequence cool stars

description: Since more than a decade, the AIP is monitoring \(\alpha\) Ori with its robotic spectroscopic facility STELLA/SES in Teide observatory, Tenerife along with its automated photoelectric telescope T7 in Fairborn observatory, Az. Additionally, we got access with exclusive two-band photometric data on Betelgeuse from the BRITE satellite consortium, covering the last seven seasons. In late 2019, Betelgeuse showed a rapid brightness decline, reaching an all-time low in Feb. 2020, followed by a quick re-brightening. This poster shows radial velocity data together with the photometry. The radial velocity follows the photometry in general, but sometimes shows a time-shift, which was particularly visible in the grand dimming event. Interesting is the time-frequency analysis of the different data set: All three show similar features at split-periods around the known P=420d.
Scattering and modified scattering for abstract wave equations with time-dependent dissipation
Creators: name: Wirth, Jens
Publisher: name: arXiv
Year: 2006
Subjects: subject: Analysis of PDEs (math.AP)
subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 35L90, 35L15

description: We consider the initial-value problem of abstract wave equations with weak dissipation. We show that under conditions on the dissipation coefficient and its derivative the solutions to the abstract dissipative equation are closely related to solutions of the free problem multiplied by a decay function. This paper gives the counterpart to a recent paper of T.Yamazaki [Adv. Differential Equ., 11(4):419--456, 2006], where effective dissipation terms and the relation to the corresponding abstract parabolic problem are considered.
description: 18 pages
Bullying in a multicultural context: The case of the intercultural junior high school of Eastern Thessaloniki
Creators: name: Λιούμπα, Ειρήνη Προκοπίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Σχολικός Εκφοβισμός
Διαπολιτισμική Εκπαίδευση
Ψηφιακό Παιχνίδι Cyberball
Bullying
Educultural Education
Cyberball

description: The current experimental study investigated the extent of bullying in an intercultural school and certain factors that are related to it. More specifically, teachers’ and students’ views on the factors that affect bullying incidents in their school, its common causes, its consequences and any potential anti-bullying measures taken were examined. Data were collected through a questionnaire administered to the participants, which was directly asking about the possible bullying incidents in their school and a questionnaire which examined the students’ feelings after experiencing isolation imposed to them through a virtual game; Cyberball. The results indicated that there is indeed bullying in this school and multiple correlations were found between certain types of bullying and all the other factors that were under investigation, despite the fact that the teachers and some of the students claimed the opposite. It was also suggested that bullies and victims seem to experience different feelings when they are being isolated.
description: Η παρούσα έρευνα μελέτησε την έκταση του φαινομένου του σχολικού εκφοβισμού σε ένα διαπολιτισμικό σχολείο και ορισμένους παράγοντες, οι οποίοι σχετίζονται με αυτό. Πιο συγκεκριμένα, εξετάστηκαν οι απόψεις των καθηγητών και των μαθητών πάνω στους παράγοντες που επηρεάζουν τα περιστατικά εκφοβισμού στο σχολείο τους, οι αιτίες και οι συνέπειες του φαινομένου αυτού, καθώς και τα πιθανά μέτρα που λαμβάνονται ενάντια στον εκφοβισμό. Η συλλογή των δεδομένων έγινε με τη βοήθεια ερωτηματολογίου, το οποίο διανεμήθηκε στους συμμετέχοντες. Οι τελευταίοι ερωτήθηκαν ευθέως μέσω αυτού του ερωτηματολογίου για τα πιθανά περιστατικά εκφοβισμού στο σχολείο τους. Ένα ακόμη ερωτηματολόγιο, το οποίο εξέταζε τα συναισθήματα των μαθητών αφότου είχαν βιώσει αποκλεισμό μέσω ενός ψηφιακού παιχνιδιού, του Cyberball, διανεμήθηκε στους μαθητές. Τα αποτελέσματα έδειξαν ότι πραγματικά υπήρχε εκφοβισμός στο συγκεκριμένο σχολείο και βρέθηκαν πολλές συσχετίσεις μεταξύ ορισμένων μορφών εκφοβισμού και όλων των άλλων παραγόντων που εξετάστηκαν, παρά το γεγονός ότι οι καθηγητές και κάποιοι από τους μαθητές ισχυρίζονταν το αντίθετο. Επίσης έγινε φανερό ότι οι μαθητές, οι οποίοι είναι υπεύθυνοι για τα περιστατικά εκφοβισμού, βιώνουν διαφορετικά συναισθήματα όταν απομονώνονται σε σχέση με τους μαθητές, οι οποίοι έχουν πέσει θύματα του εκφοβισμού.
Developing culturally adapted Mental Health (MH) tools through a brief qualitative study on Mental Health and Psychosocial (MHPS) problems of people in Grozny, Chechnya, July-August 2014.
Creators: name: Feo, Concetta
name: Nguyen, Amanda J
name: Kyuri Idrisov
name: Bolton, Paul
name: Bass, Judith
name: Pintaldi, Giovanni
Publisher: name: F1000Research
Year: 2015

description: This study aims to adapt internationally recognised Mental Health (MH) screening tools to the cultural context of Chechnya; using a brief qualitative study to identify locally relevant psychosocial problems and tasks/activities of daily living.The qualitative study was the basis to construct a culturally adapted assessment tool to measure MHPS and functioning according to local perceptions and expectations in Chechnya;

This enriches the ability of our teams to understand and address MH problems and functioning in this population;

The resulting tools are now being used in MSF’s MH outcomes evaluation study in Grozny, which is ongoing since November 2014.
Rotating 5D Black Holes: Interactions and deformations near extremality
Creators: name: Castro, Alejandra
name: Pedraza, Juan F.
name: Toldo, Chiara
name: Verheijden, Evita
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We study a two-dimensional theory of gravity coupled to matter that is relevant to describe holographic properties of black holes with a single rotational parameter in five dimensions (with or without cosmological constant). We focus on the near-horizon geometry of the near-extremal black hole, where the effective theory reduces to Jackiw-Teitelboim (JT) gravity coupled to a massive scalar field. We compute the corrections to correlation functions due to cubic interactions present in this theory. A novel feature is that these corrections do not have a definite sign: for AdS$_5$ black holes the sign depends on the mass of the extremal solution. We discuss possible interpretations of these corrections from a gravitational and holographic perspective. We also quantify the imprint of the JT sector on the UV region, i.e. how these degrees of freedom, characteristic for the near-horizon region, influence the asymptotically far region of the black hole. This gives an interesting insight on how to interpret the IR modes in the context of their UV completion, which depends on the environment that contains the black hole.
description: 45 pages, 2 figures, v3: references added, minor edits
Cosmological N-body simulations: a challenge for scalable generative models: Tensorflow checkpoints
Creators: name: Perraudin, Nathanael
Publisher: name: Zenodo
Year: 2019

description: This corresponds to the Tensorflow checkpoints for the experiments in the paper
 **Cosmological N-body simulations: a challenge for scalable generative models** by
 Nathanaël Perraudin, Ankit Srivastava, Aurelien Lucchi, Tomasz Kacprzak, Thomas Hofmann, Alexandre Refregier, Adam Amara. Please check the assotiated github page https://github.com/nperraud/3DcosmoGAN for additional information.
Minimal Noncanonical Cosmologies
Creators: name: Barenboim, Gabriela
name: Lykken, Joseph D.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We demonstrate how much it is possible to deviate from the standard cosmological paradigm of inflation-assisted LambdaCDM, keeping within current observational constraints, and without adding to or modifying any theoretical assumptions. We show that within a minimal framework there are many new possibilities, some of them wildly different from the standard picture. We present three illustrative examples of new models, described phenomenologically by a noncanonical scalar field coupled to radiation and matter. These models have interesting implications for inflation, quintessence, reheating, electroweak baryogenesis, and the relic densities of WIMPs and other exotics.
description: 20 pages, 5 figures, 3 tables
Η ηλεκτρονική διακυβέρνηση στις δασικές υπηρεσίες στην Ελλάδα
Creators: name: Λαμπρίδης, Χαράλαμπος Λαζάρου
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Ηλεκτρονική διακυβέρνηση
Δασική υπηρεσία
Τεχνολογίες πληροφοριών και επικοινωνιών (ΤΠΕ)
E-government
Forest service
Information and communication technology (ICT)

description: Η τεχνολογία των πληροφοριών έχει ανοίξει πολλές δυνατότητες βελτίωσης της εσωτερικής διαχειριστικής αποτελεσματικότητας και της ποιότητας της παροχής δημόσιων υπηρεσιών στους πολίτες. Οι τεχνολογίες πληροφοριών και επικοινωνιών (ΤΠΕ) μπορούν να υποστηρίξουν με επιτυχία την ενίσχυση των παρεχόμενων υπηρεσιών στο κοινό, την εξάλειψη της γραφειοκρατίας και την αύξηση της παραγωγικότητας. Η ηλεκτρονική διακυβέρνηση αφορά στον εκσυγχρονισμό της Δημόσιας Διοίκησης και του Κράτους συνολικά μέσω των Τεχνολογιών Πληροφορικής και Επικοινωνιών (ΤΠΕ) με απώτερο στόχο το μετασχηματισμό των υφιστάμενων διαδικασιών και την αναβάθμιση των υφιστάμενων παρεχόμενων υπηρεσιών, προκειμένου η Δημόσια Διοίκηση και οι δημόσιοι φορείς που παρέχουν υπηρεσίες να γίνουν αποτελεσματικότεροι και αποδοτικότεροι. Σκοπός της παρούσας εργασίας είναι η μελέτη και παρουσίαση των ιστοσελίδων που συνδέονται άμεσα με τη δασική υπηρεσία στην Ελλάδα. Για την επίτευξη των στόχων της εργασίας πραγματοποιήθηκε διερεύνηση σε τέσσερις δημοφιλείς ιστοσελίδες που σχετίζονται με τη δασική υπηρεσία, ώστε να μελετηθεί η διαδικτυακή επάρκεια αυτών όσον αφορά την ηλεκτρονική διακυβέρνηση. Από την παραπάνω μελέτη οδηγούμαστε στο συμπέρασμα ότι τα τελευταία χρόνια έχουν γίνει κάποια βήματα προόδου ως προς την υλικοτεχνική υποδομή, την τηλεπικοινωνιακή σύνδεση των υπηρεσιών και τη σχεδίαση των ιστοσελίδων στα πρότυπα της ηλεκτρονική διακυβέρνησης. Παρόλα αυτά υπάρχουν μεγάλα περιθώρια ανάπτυξης, αν συγκρίνει κανείς αντίστοιχες ιστοσελίδες από άλλα προηγμένα ευρωπαϊκά κράτη.
description: Information technology has opened up many possibilities for improving internal management efficiency and the quality of public service delivery to citizens. Information and communication technologies (ICT) can successfully support the enhancement of public service provision, the elimination of bureaucracy and the increase in productivity. E-Government is concerned with the modernization of Public Administration and the State as a whole through Information and Communication Technologies (ICT) with the ultimate goal of transforming existing processes and upgrading existing services so that Public Administration and public service providers become more efficient. The purpose of this paper is to study and present the web pages directly linked to the forest service in Greece. To achieve the objectives of the work, four popular forest-related websites were explored in order to study their online e-government adequacy. From the above study we conclude that in recent years some progress has been made in terms of logistics infrastructure, telecommunication linking services and designing web sites to eGovernment standards. However, there is great scope for growth if one compares similar websites from other advanced European countries.
Treating children for drug-resistant tuberculosis in Tajikistan with Group Five medications
Creators: name: Aravind Swaminathan
name: Cros, Philipp Du
name: Seddon, James
name: Bobokhojaev, Oktam
name: Dusmatova, Zulfiya
name: Quinnell, Sarah
name: West, Kim
name: Achar, Jay
Publisher: name: F1000Research
Year: 2015

description: Médecins Sans Frontières (MSF), in coordination with the Ministry of Health and Social Protection of the Republic of Tajikistan (MoH) has been treating drug-resistant (DR) tuberculosis (TB) in children in Tajikistan since 2011. The management of DR-TB continues to be challenging due to a lack of effective drugs. Although Group Five anti-TB drugs are increasingly being used for the management of multidrug-resistant (MDR)-TB with additional resistance to an injectable and/or a fluoroquinolone, data regarding their efficacy and safety are limited in children. Here we present the clinical outcomes and adverse events of a cohort of children treated with Group Five drugs in Tajikistan.Group Five anti-TB drugs appear safe and effective, and can provide an option for the design of an effective regimen in children with XDR- and MDR-TB with injectable or fluoroquinolone resistance. With proper monitoring and aggressive management of adverse events, the safety profile of these drugs appears acceptable in long-term use.
Direct Observation (DO) for drug-resistant tuberculosis: do we really DO?
Creators: name: Smith, Stella
name: Isaakidis, Petros
name: Mrinalini Das
name: Sonakshi Jadhav
name: Furin, Jennifer
name: Reid, Tony
Publisher: name: F1000Research
Year: 2015

description: Direct observation (DO) is recommended for drug-resistant tuberculosis (DR-TB) patients during their entire treatment duration. However, limited published evidence exists on implementation of DO in the field. We aim to detail whether directly observed therapy (DOT) was followed by DR-TB patients under DOT-providers in Médecins Sans Frontières(MSF) tuberculosis programme, Mumbai, India.DO was not followed by two-thirds of the patients in our study. However, they were successfully continuing treatment. We acknowledge that our small cohort was supported and closely monitored by trained resource-heavy team, which may be challenging in a programmatic setting in India.

Our strict DOT criteria showed poorer uptake of DOT among patients, even after regular counselling and adherence support by the team. Thus, we need advanced community-initiatives for better treatment adherence in patients.

We believe that feasible, patient-centred strategies and innovative monitoring tools should be adopted in DR-TB programmes.
Duffing-type equations: singular points of amplitude profiles and bifurcations
Creators: name: Kyzioł, Jan
name: Okniński, Andrzej
Publisher: name: arXiv
Year: 2021
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: FOS: Physical sciences
subject: 34C15, 74H10, 70K50

description: We study the Duffing equation and its generalizations with polynomial nonlinearities. Recently, we have demonstrated that metamorphoses of the amplitude response curves, computed by asymptotic methods in implicit form as $F\left( Ω,\ A\right) =0$, permit prediction of qualitative changes of dynamics occurring at singular points of the implicit curve $F\left(Ω,\ A\right) =0$. In the present work we determine a global structure of singular points of the amplitude profiles computing bifurcation sets, i.e. sets containing all points in the parameter space for which the amplitude profile has a singular point. We connect our work with independent research on tangential points on amplitude profiles, associated with jump phenomena, characteristic for the Duffing equation. We also show that our techniques can be applied to solutions of form $Ω_{\pm }=f_{\pm }\left( A\right) $, obtained within other asymptotic approaches.
description: 21 pages, 12 figures, section on related results added. arXiv admin note: text overlap with arXiv:2004.09236
Task shifting and simplification of HIV care: description of the model of care in Yangon project, Myanmar
Creators: name: Thwe, Thin Thin
name: Aung Aung
name: Fontaine, Julie
name: Mesic, Anita
name: Khin Khin
name: Zarkua, Nana
name: Jean-Christophe Dollé
Publisher: name: F1000Research
Year: 2015

description: Since January 2014 the National AIDS Program Myanmar has started with systematic scale up of ART. Decentralization of ART services has been rolling out gradually, but ART is mainly available in the centralized sites. Human resources are one of the major obstacles for successful ART scale up in the country, still only physicians are available to initiate treatment and follow up patients on ART - this current model of care is hospital and physician intensive.

MSF Holland in Myanmar has been responsible for 32 000 patients on ART treatment . Since 2010 MSF has been introducing simplified model of HIV care and gradual task shifting, for the management of stable patients on ART in their clinics. The purpose of this study is to report outcomes of such a model of care.Results of the study will be shared with the main stakeholders and hopefully will be considered in decentralization and ART scale up plans within National AIDS Program. We hope that the study results will help to accept a concept of simplified model of HIV care, allowing for faster national ART scale up and decentralisation.
Reading between the lines": Magnetospheric accretion, winds, and the inner disk
Creators: name: Sicilia-Aguilar, Aurora
name: Campbell-White, Justyn
name: Bouvier, Jerome
name: Roccatagliata, Veronica
name: Matsumura, Soko
name: Fang, Min
name: Manara, Carlo F
name: de Boer, Jos
name: Kospal, Agnes
Publisher: name: Zenodo
Year: 2021
Subjects: Young stars
Spectroscopy
Accretion
Planet and Star Formation
Python

description: What happens in the innermost disk at the time of planet formation? While direct mapping cannot access these regions, emission (and absorption) lines in young stars trace their winds, accretion-related structures, spots, and innermost disk. In the optical, a large number of species with various excitation potentials can provide information on the temperature, density, and velocity of hot and tiny structures. Using time-resolved spectroscopy covering several rotational and disk orbital periods, we can obtain a very detailed view of the structure and variability of accretion columns and spots and information on the presence and launching points of stellar/disk winds in young stars. In outbursting sources, the temperature variation allows us to spectroscopically access an even larger region of the disk and surroundings. Here we present the results on several young stars with different properties, discussing what we can learn from "reading between their (spectral) lines" and how to achieve this with the STAR-MELT Python package, which will be publicly released soon (see Poster and video by Justyn Campbell-White for further details).
description: {"references": ["Sicilia-Aguilar, A., et al. (2015), A&A, 580, A82", "Sicilia-Aguilar, A., et al. (2017), A&A 607, 127", "Sicilia-Aguilar, A., et al. (2020a), A&A 633, 37", "Sicilia-Aguilar, A., et al. (2020b), A&A 643, 29", "Campbell-White, Sicilia-Aguilar, Matsumura, et al. in prep."]}
Problems for the problem session of Workshop "Affine Algebraic Geometry", Oberwolfach, January 7--14, 2007
Creators: name: Popov, Vladimir L.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 14L30; 14R20; 20G05

description: Formulated problems concern the following topics: (1) Birationally nonequivalent linear actions; (2) Cayley degrees of simple algebraic groups; (3) Singularities of two-dimensional quotients.
description: 3 pages
Combine and Conquer: Event Reconstruction with Bayesian Ensemble Neural Networks
Creators: name: Araz, Jack Y.
name: Spannowsky, Michael
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Ensemble learning is a technique where multiple component learners are combined through a protocol. We propose an Ensemble Neural Network (ENN) that uses the combined latent-feature space of multiple neural network classifiers to improve the representation of the network hypothesis. We apply this approach to construct an ENN from Convolutional and Recurrent Neural Networks to discriminate top-quark jets from QCD jets. Such ENN provides the flexibility to improve the classification beyond simple prediction combining methods by linking different sources of error correlations, hence improving the representation between data and hypothesis. In combination with Bayesian techniques, we show that it can reduce epistemic uncertainties and the entropy of the hypothesis by simultaneously exploiting various kinematic correlations of the system, which also makes the network less susceptible to a limitation in training sample size.
description: 23 pages, 17 figures. Accepted version for publication in JHEP