cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Toward relaxation asymmetry: Heating is faster than cooling
Creators: name: Van Vu, Tan
name: Hasegawa, Yoshihiko
Publisher: name: arXiv
Year: 2021
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: An asymmetry in thermal relaxation toward equilibrium has been uncovered for Langevin systems near stable minima [Phys. Rev. Lett. 125, 110602 (2020)]. It has been shown that, given the same degree of nonequilibrium of the initial distributions, relaxation from a lower temperature state (heating) is faster than that from a higher temperature state (cooling). In this study, we elucidate this relaxation asymmetry for discrete-state Markovian systems described by the master equation. We rigorously prove that heating is faster than cooling for arbitrary two-state systems, whereas for systems with more than two distinct energy levels, the relaxation asymmetry is no longer universal. Furthermore, for systems whose energy levels degenerate into two energy states, we find that there exist critical thresholds of the energy gap. Depending on the magnitude of the energy gap, heating can be faster or slower than cooling, irrespective of the transition rates between states. Our results clarify the relaxation asymmetry for discrete-state systems and reveal several hidden features inherent in thermal relaxation.
description: 8 pages, 4 figures
A LONG-TERM MAGNETIC FIELD AND ACTIVITY STUDY IN M GIANT STАRS
Creators: name: Konstantinova-Antova, Renada
name: Georgiev, Stefan
name: Lèbre, Agnes
name: Palacios, Ana
name: Morin, Julien
name: Abbott, Caleb
name: Baron, Fabien
name: Aurière, Michel
name: Bogdanovski, Rumen
name: Tsvetkova, Svetla
name: Drake, Natalia
name: Paladini, Claudia
name: Josselin, Eric
name: Mathias, Philippe
Publisher: name: Zenodo
Year: 2021
Subjects: AGB stars, magnetic field and activity

description: In three selected M giants, EK Boo, RZ Ari and β Peg, we investigate the long-term behavior and the possible mechanims for magnetic field generation in the context of stellar evolution.
Finite Action Principle and Horava-Lifshitz Gravity: early universe, black holes and wormholes
Creators: name: Chojnacki, Jan
name: Kwapisz, Jan H.
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The destructive interference of the neighbouring field configurations with infinite classical action in the gravitational path integral approach serves as a dynamical mechanism resolving the black hole singularity problem. It also provides an isotropic and homogeneous early universe without the need of inflation. In this work, we elaborate on the finite action in the framework of Horava-Lifshitz gravity -- a ghost-free QFT. Assuming the mixmaster chaotic solutions in the projectable H-L theory, we show that the beginning of the universe is homogeneous and isotropic. Furthermore, we show that the H-L gravity action selects only the regular black-hole spacetimes. We also comment on possibility of traversable wormholes in theories with higher curvature invariants.
description: Matches the version accepted in PRD, one minor mistake corrected
Cubic Hall viscosity in three-dimensional topological semimetals
Creators: name: Robredo, Iñigo
name: Rao, Pranav
name: de Juan, Fernando
name: Bergara, Aitor
name: Mañes, Juan L.
name: Cortijo, Alberto
name: Vergniory, M. G.
name: Bradlyn, Barry
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The nondissipative (Hall) viscosity is known to play an interesting role in two-dimensional (2D) topological states of matter, in the hydrodynamic regime of correlated materials, and in classical active fluids with broken time-reversal symmetry (TRS). However, generalizations of these effects to 3D have remained elusive. In this work, we address this question by studying the Hall viscoelastic response of 3D crystals. We show that for systems with tetrahedral symmetries, there exist new, intrinsically 3D Hall viscosity coefficients that cannot be obtained via a reduction to a quasi-2D system. To study these coefficients, we specialize to a theoretically and experimentally motivated tight-binding model for a chiral magnetic metal in (magnetic) space group [(M)SG] P2$_1$3 (No. 198.9), a nonpolar group of recent experimental interest that hosts both chiral magnets and topological semimetals (TSMs). Using the Kubo formula for viscosity, we compute two forms of the Hall viscosity, phonon and ``momentum'' (conventional) and show that for the tight-binding model we consider, both forms realize the novel cubic Hall viscosity. We conclude by discussing the implication of our results for transport in 2D magnetic metals and discuss some candidate materials in which these effects may be observed.
description: v2: Published version. v1: 7+7+epsilon pages, 2 figures
Dynamics of rational symplectic mappings and difference Galois theory
Creators: name: Casale, Guy
name: Roques, Julien
Publisher: name: arXiv
Year: 2008
Subjects: subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics

description: In this paper we study the relationship between the integrability of rational symplectic maps and difference Galois theory. We present a Galoisian condition, of Morales-Ramis type, ensuring the non-integrability of a rational symplectic map in the non-commutative sense (Mishchenko-Fomenko). As a particular case, we obtain a com- plete discrete analogue of Morales-Ramis Theorems for non-integrabi- lity in the sense of Liouville.
A case study of a post-observation conference in a second language setting
Creators: name: Guevremont, Louise Anne
Publisher: name: University of British Columbia
Year: 2009

description: This case study examined the nature of the exchange between two French-as-asecond language teachers involved in a worthwhile post-observation conference, identified the conditions that facilitated their exchange, and investigated how this supervision experience contributed to the development of the teacher's practice. Since clinical supervision involves the analysis and interpretation of classroom data, it seemed important to inquire whether knowledge of the content, approach, and issues related to the teaching of a second language appeared to be a condition that facilitated a worthwhile outcome. Transcripts of the post-observation conference videotape and stimulated recall interview audiotape provided two of the three sources of data. A preliminary content analysis was conducted to examine the characteristics of the exchange between the participants and to ascertain whether the four conditions identified from previous studies, teacher-supervisor relationship, Glickman's (1990) developmental approach, peer supervision, and reflective transformation of experience, were present in this case. Results were used to frame questions for a subsequent interview with the teacher in order to explore further themes and issues that emerged from the preliminary analysis. Findings indicate that the exchange between the teacher and supervisor was nonjudgmental, honest, supportive, cooperative, and close to Cogan's (1973) colleagueship. The teacher-supervisor relationship and peer supervision by a second language teacher were found to be two conditions that facilitated a worthwhile outcome. However, the Glickman's developmental model was not found totally appropriate in peer supervision because the supervisor does not have the choice of a full range of approaches since s/he cannot enact decisions. Even though the conditions were present, reflective transformation of experience was not completed during the post-observation conference and it was therefore suggested that it may not be an appropriate indicator of teacher development. Finally, supervision was found to be useful in three different ways. It increased the teacher's awareness of her teaching, enabled her to take appropriate action, and provided useful feedback on her experimentation with new material. Based on these findings, it was concluded that the role of the post-observation conference may need to be reviewed, particularly in the case of experienced teachers using supervision for professional development. It was also recommended that further study be conducted to verify this case study's findings on a larger scale and find out whether they apply to teachers from different areas, and to investigate how teachers conduct their reflection outside the post-observation conference.
Are Work Zones and Connected Automated Vehicles Ready for a Harmonious Coexistence? A Scoping Review and Research Agenda
Creators: name: Dehman, Amjad
name: Farooq, Bilal
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computers and Society (cs.CY)
subject: FOS: Computer and information sciences

description: The recent advent of connected and automated vehicles (CAVs) is expected to transform the transportation system. CAV technologies are being developed rapidly and they are foreseen to penetrate the market at a rapid pace. On the other hand, work zones (WZs) have become common areas on highway systems as a result of the increasing construction and maintenance activities. The near future will therefore bring the coexistence of CAVs and WZs which makes their interaction inevitable. WZs expose all vehicles to a sudden and complex geometric change in the roadway environment, something that may challenge many of CAV navigation capabilities. WZs however also impose a space contraction resulting in adverse traffic impacts, something that legitimately calls for benefiting from the highly efficient CAV functions. CAVs should be able to reliably traverse WZ geometry and WZs should benefit from CAV intelligent functions. This paper reviews the state-of-the-art and the key concepts, opportunities, and challenges of deploying CAV systems at WZs. The reviewed subjects include traffic performance and behaviour, technologies and infrastructure, and regulatory considerations. Eighteen CAV mobility, safety, and environmental concepts and functions were distributed over the WZ area which was subdivided into five segments: further upstream, approach area, queuing area, WZ activity, and termination area. In addition, among other topics reviewed and discussed are detection of WZ features, smart traffic control devices, various technologies at connected WZs, cross-border harmonization, liability, insurance, and privacy. The paper also provides a research agenda with a list of research needs supported by experts rating and inputs. The paper aims to provide a bird eye view, but with necessary details that can benefit researchers, practitioners, and transportation agencies.
description: This paper is published in Transportation Research Part C: Emerging Technologies journal
Mathematical modeling of heat transfer in the meniscus region of the continuous slab casting mould
Creators: name: Wang, Yan
Publisher: name: University of British Columbia
Year: 2009

description: The objective of this investigation was to characteristize the heat transfer phenomena related to the Submerged Entry Nozzle (SEN) and its role on the heat transfer of the liquid steel in the meniscus region of the mould broad face. The investigation has been conducted based on a previous plant trial at Stelco’s Lake Erie. A mathematical model, which includes the SEN and the liquid steel, was formulated. The heat transfer in the SEN was examined by performing a two - dimensional finite difference model with the Alternating Direction Implicit (ADI) method. The influences of the SEN on the steel heat transfer in the meniscus region was studied under various conditions. The heat transfer of the liquid steel was investigated (i) by a plug flow model for the liquid steel flowing through the SEN tube and (ii) by a one-dimensional finite difference model for the liquid steel in the meniscus region. The modeling results revealed that the SEN absorbs heat from the liquid steel both inside the SEN tube and in the meniscus region, and loses heat to the atmosphere through its exposed surface above the meniscus; the liquid steel falling through the SEN tube has a temperature drop of about 2.4°C from the SEN entrance to exit for a SEN length of 0.7 m; about 30% of the superheat extracted of the liquid steel in the meniscus region is absorbed by the SEN. Many factors, such as the thermal properties of the SEN sleeve and body materials and the mould flux insulation depth and performance, have influences on the heat transfer of the SEN and then on the heat transfer of the liquid steel in the meniscus. The distance between the mould broad face and the SEN is also an important factor which influences the severity of the cooling effect of the liquid steel in the meniscus caused by the SEN heat transfer. With the shorter distance between the mould broad face and the SEN, the cooling effect of the liquid steel is more pronounced. The SEN tube length, especially the length above the meniscus, has an effect on the temperature drop of the liquid steel inside the SEN. The results of this work showed the importance of the heat transfer of the SEN regarding to the casting process and provided guidelines for improvements on slab surface quality and operating practice.
title: Digitalization of trainings in the Business environment : Using the example of an E-Learning production in the field of occupational safety and environmental protection
Creators: name: Sael, Maria
Publisher: name: Hochschule Hannover
Year: 2024
Subjects: subject: 650 Management

description: This research focuses on the fundamental ideas and underlying principles of E-Learning technology, as well as theoretical considerations for an optimal learning environment. This theoretical exploration was then used as a basis for the design and construction of a new, interactive Web-Based ESH-Training. The quality and effectiveness of this new course was then compared with that of the existing analog PDF-Training via a test with a diverse sample of employee learners. Learners were later surveyed to ascertain their views on both trainings in terms of the quality of the content, facilitator, resources, and length. Results clearly showed that regardless of demographic factors, most employee learners preferred the new, Web-Based ESH-Training to the analog PDF-Training.
PSLA: Improving Audio Tagging with Pretraining, Sampling, Labeling, and Aggregation
Creators: name: Gong, Yuan
name: Chung, Yu-An
name: Glass, James
Publisher: name: arXiv
Year: 2021
Subjects: subject: Sound (cs.SD)
subject: Machine Learning (cs.LG)
subject: Audio and Speech Processing (eess.AS)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Audio tagging is an active research area and has a wide range of applications. Since the release of AudioSet, great progress has been made in advancing model performance, which mostly comes from the development of novel model architectures and attention modules. However, we find that appropriate training techniques are equally important for building audio tagging models with AudioSet, but have not received the attention they deserve. To fill the gap, in this work, we present PSLA, a collection of training techniques that can noticeably boost the model accuracy including ImageNet pretraining, balanced sampling, data augmentation, label enhancement, model aggregation and their design choices. By training an EfficientNet with these techniques, we obtain a single model (with 13.6M parameters) and an ensemble model that achieve mean average precision (mAP) scores of 0.444 and 0.474 on AudioSet, respectively, outperforming the previous best system of 0.439 with 81M parameters. In addition, our model also achieves a new state-of-the-art mAP of 0.567 on FSD50K.
description: Published in IEEE/ACM Transactions on Audio Speech and Language Processing. Code at https://github.com/YuanGongND/psla
Constraints on a variable dark energy model with recent observations
Creators: name: Wu, Puxun
name: Yu, Hongwei
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We place, by the maximum likelihood method, constraints on a variable dark energy model with the equation of state $w=w_0/[1+b\ln (1+z)]^2$ using some recent observational data, including the new Sne Ia data from the SNLS, the size of baryonic acoustic oscillation peak from SDSS and the CMB data from WMAP3. We find that the SNLS data favor models with $w_0$ around -1, in contrast to the Gold data set which favors a more negative $w_0$. By combining these three databases, we obtain that $Ω_m=0.27_{-0.038}^{+0.036}$, $w_0=-1.11_{-0.30}^{+0.21}$ and $b=0.31^{+ 0.71}_{-0.31}$ with $χ^2=110.4$ at the 95% confidence level. Our result suggests that a varying dark energy model and a crossing of the $w = -1$ line are favored, and the present value of the equation of state of dark energy is very likely less than -1.
description: 10 pages, 4 figures, references added
Electromagnetic Signatures of Dark Photon Superradiance
Creators: name: Caputo, Andrea
name: Witte, Samuel J.
name: Blas, Diego
name: Pani, Paolo
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Black hole superradiance is a powerful tool in the search for ultra-light bosons. Constraints on the existence of such particles have been derived from the observation of highly spinning black holes, absence of continuous gravitational-wave signals, and of the associated stochastic background. However, these constraints are only strictly speaking valid in the limit where the boson's interactions can be neglected. In this work we investigate the extent to which the superradiant growth of an ultra-light dark photon can be quenched via scattering processes with ambient electrons. For dark photon masses $m_{γ^\prime} \gtrsim 10^{-17}\,{\rm eV}$, and for reasonable values of the ambient electron number density, we find superradiance can be quenched prior to extracting a significant fraction of the black-hole spin. For sufficiently large $m_{γ^\prime}$ and small electron number densities, the in-medium suppression of the kinetic mixing can be efficiently removed, and quenching occurs for mixings $χ_0 \gtrsim \mathcal{O}(10^{-8})$; at low masses, however, in-medium effects strongly inhibit otherwise efficient scattering processes from dissipating energy. Intriguingly, this quenching leads to a time- and energy-oscillating electromagnetic signature, with luminosities potentially extending up to $\sim 10^{57}\,{\rm erg / s}$, suggesting that such events should be detectable with existing telescopes. As a byproduct we also show that superradiance cannot be used to constrain a small mass for the Standard Model photon.
description: v2: Minor changes, matches published version. v1: 14 pages, 3 figures, appendix
Η συμβολή ενός οργανωμένου κινητικού προγράμματος διαμορφώνει το ημερήσιο πρόγραμμα του παιδικού σταθμού και προάγει τις κινητικές ικανότητες των παιδιών
Creators: name: Στεφανίδου, Σοφία Παρασκευά
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: κινητική ανάπτυξη
παιδικός σταθμός
αναλυτικό πρόγραμμα
motor development
nursery school
curriculum

description: Η παρούσα εργασία σχεδιάστηκε για να εξετάσει την επίδραση ενός παρεμβατικού κινητικού προγράμματος στην κινητική ανάπτυξη παιδιών που φοιτούν στον παιδικό σταθμό. Στην έρευνα συμμετείχαν ενενήντα οκτώ παιδιά ηλικίας τριάμισι έως πέντε που φοιτούσαν σε τρεις παιδικούς σταθμούς του Δήμου Καλαμαριάς, στη Θεσσαλονίκη. Τα σαράντα εννέα παιδιά που αποτέλεσαν την πειραματική ομάδα έλαβαν μέρος για δύο μήνες σε δεκαέξι οργανωμένα μαθήματα που σχεδιάστηκαν με στόχο την ανάπτυξη των βασικών κινητικών τους δεξιοτήτων. Το εργαλείο μέτρησης που χρησιμοποιήθηκε για την αξιολόγηση του δείγματος πριν και μετά την παρέμβαση ήταν το τεστ της αδρής κινητικής ανάπτυξης του Ulrich, η δεύτερη έκδοση. Η στατιστική ανάλυση έδειξε ότι η πειραματική ομάδα μετά το παρεμβατικό πρόγραμμα βελτίωσε τις κινητικές της επιδόσεις, ενώ δε βρέθηκαν στατιστικές διαφορές στην ομάδα ελέγχου. Όσον αφορά το φύλο ως παράγοντα στην κινητική ανάπτυξη, δεν βρέθηκαν στατιστικές διαφορές σε καμία από τις δύο ομάδες. Οι παιδαγωγοί θα πρέπει να εντάξουν στο ημερήσιο πρόγραμμα τους κατάλληλα κινητικά προγράμματα που ενισχύουν την κινητική ανάπτυξη των παιδιών, παρόλο που δεν υπάρχει μέχρι σήμερα αναλυτικό πρόγραμμα σπουδών για τους παιδικούς σταθμούς που να το ορίζει.
description: The present study was designed to examine the effect of an intervention program on nursery school children’s locomotor development. The participants were ninety eight children from three and a half to five years old from three preschools of the Municipality of Kalamaria, in Thessaloniki. The forty nine children who formed the experimental group participated for two months in sixteen organized courses, designed to develop basic motor skills. The measurement tool used to evaluate the sample before and after the intervention was Ulrich’s test of gross motor development, the second edition. The statistical analysis showed that the experimental group improved their motor performance after the intervention program, while the control group had no statistical difference. With regard to sex as a factor in motor development, no statistical difference was observed in either group. The results showed that educators should incorporate appropriate motor programs in their daily
description: Σε συνεργασία με το Παιδαγωγικό Τμήμα Νηπιαγωγών (Πανεπιστήμιο Δυτικής Μακεδονίας)
On the optimal dividend problem for a spectrally negative Lévy process
Creators: name: Avram, Florin
name: Palmowski, Zbigniew
name: Pistorius, Martijn R.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Probability (math.PR)
subject: Pricing of Securities (q-fin.PR)
subject: FOS: Mathematics
subject: FOS: Economics and business
subject: 60J99 (Primary) 93E20, 60G51 (Secondary)

description: In this paper we consider the optimal dividend problem for an insurance company whose risk process evolves as a spectrally negative Lévy process in the absence of dividend payments. The classical dividend problem for an insurance company consists in finding a dividend payment policy that maximizes the total expected discounted dividends. Related is the problem where we impose the restriction that ruin be prevented: the beneficiaries of the dividends must then keep the insurance company solvent by bail-out loans. Drawing on the fluctuation theory of spectrally negative Lévy processes we give an explicit analytical description of the optimal strategy in the set of barrier strategies and the corresponding value function, for either of the problems. Subsequently we investigate when the dividend policy that is optimal among all admissible ones takes the form of a barrier strategy.
description: Published at http://dx.doi.org/10.1214/105051606000000709 in the Annals of Applied Probability (http://www.imstat.org/aap/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Activity of TRAPPIST-1 analogue stars observed with TESS
Creators: name: Seli, Bálint
name: Vida, Krisztián
name: Moór, Attila
name: Pál, András
name: Oláh, Katalin
Publisher: name: Zenodo
Year: 2021
Subjects: Very low mass stars

description: We present an analysis of TRAPPIST-1 like ultracool dwarfs with TESS full-frame image photometry from the first two years of the primary mission. We constructed a volume-limited sample up to 50 pc, consisting of stars in the vicinity of TRAPPIST-1 on the Gaia color-magnitude diagram. We searched for flares and rotational modulation on the light curves of 248 stars. We determined rotational periods for 42 stars, and estimated the ages of 88 stars using kinematic information. A weak correlation between rotational period and age is observed. The composite flare frequency distribution shows a power-law index similar to TRAPPIST-1, and it is extended to higher energies. The results imply that while superflares can be expected every few decades, the flare rate of such stars is insufficient to fully destroy the possible ozone layer of orbiting planets.
description: {"references": ["F. Almeida-Fernandes & H. J. Rocha-Pinto (2018), MNRAS, 476, 184", "J. Gagn\u00e9 et al. (2018), ApJ, 856, 23", "K. Vida et al. (2017), ApJ, 841, 124", "P. B. Rimmer et al. (2018), SciA, 4, 3302", "M. A. Tilley et al. (2019), AsBio, 19, 64"]}
Acaulospora flavopapillosa, a new fungus in the Glomeromycetes from a coffee plantation in Peru, with an updated key for the identification of Acaulosporaceae species
Creators: name: Corazon-Guivin, Mike
name: Vallejos-Tapullima, Adela
name: De La Sota-Ricaldi, Ana Maria
name: Vallejos-Torres, Geomar
name: Ruíz-Sánchez, Maria Emilia
name: Santos, Viviane Monique
name: Alves Da Silva, Gladstone
name: Oehl, Fritz
Publisher: name: Journal of Applied Botany and Food Quality
Year: 2022

description: A new fungus of the arbuscular-mycorrhiza forming Glomeromycetes was found in a coffee plantation in Palestina, located in the Amazonian region of San Martín State in Peru. The fungus was propagated in bait cultures on Brachiaria brizantha, Medicago sativa and Sorghum vulgare as host plants. It forms typical acaulosporoid spores laterally on sporiferous saccule necks. The spores are brownish yellow to yellow brown, 125-160 μm in diam and are crowded with papillae on their surface. The papillae are approximately 1 μm wide as well as high. According to the color and surface structure of its spores, the fungus is here described under the epithet Acaulospora flavopapillosa. Phylogenetically, the new fungus clusters in a well-separated clade within a group that comprises A. fragilissima, A. saccata, A. papillosa, A. morrowiae, A. delicata, A. rugosa, A. dilatata and A. longula. Also A. excavata and A. dilatata were found by concomitant morphological and molecular phylogenetic analyses in San Martín State during this study: A. excavata in another coffee plantation, and A. dilatata in an inka nut plantation. An identification key for all species in the family Acaulosporaceae is updated in this study.
description: Journal of Applied Botany and Food Quality, Vol. 95 (2022): Journal of Applied Botany and Food Quality
Consistent seismic probing of subgiant and red-giant stars using EGGMiMoSA
Creators: name: Farnir Martin
name: Dupret Marc-Antoine
name: Pinçon Charly
Publisher: name: Zenodo
Year: 2021
Subjects: Post main sequence cool stars
stars:oscillations
numerical:method
stars:low mass giants

description: Context: Owing to the detection of mixed-modes, subgiant and red-giant stars provide a unique opportunity to probe the complete stellar structure of solar-like stars and to constrain stellar structure and evolution models. Aims: Taking advantage of the asymptotic description of mixed-modes, we develop a method that coherently accounts for the complex oscillation spectra of subgiant and red-giant stars. We investigate the probing potential of this technique and define robust seismic indicators, relevant of the stellar structure in order to constrain stellar models.  Results: The EGGMiMoSA (Extracting Guesses about Giants via Mixed-Modes Spectrum Adjustment) method is fast (less than a second execution) and allows to study the evolution of the typical mixed-modes spectra parameters along a grid of models ranging from the subgiant to the red-giant phases.
description: {"references": ["Mosser, B., Pin\u00e7on, C., Belkacem, K., Takata, M., & Vrard, M. 2017, A&A, 600, A1", "Pin\u00e7on, C., Takata, M., & Mosser, B. 2019, A&A, 626, A125", "Pin\u00e7on, C., Goupil, M. J., & Belkacem, K. 2020, A&A, 634, A68", "Shibahashi, H. 1979, PASJ, 31, 87"]}
Violations of conservation laws in viscous liquid dynamics
Creators: name: Dyre, Jeppe C.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: The laws expressing conservation of momentum and energy apply to any isolated system, but these laws are violated for for highly viscous liquids under laboratory conditions because of the unavoidable interactions with the measuring equipment over the long times needed to study the dynamics. Although particle number conservation applies strictly for any liquid, the solidity of viscous liquids implies that even this conservation law is apparently violated in coarse-grained descriptions of density fluctuations.
description: 4 pages
Spectrum of a non-self-adjoint operator associated with the periodic heat equation
Creators: name: Chugunova, Marina
name: Pelinovsky, Dmitry
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mathematical Physics (math-ph)
subject: Spectral Theory (math.SP)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: 34Lxx, 76Rxx, 65F15, 65Q05

description: We study the spectrum of the linear operator $L = - \partial_θ - ε\partial_θ (\sin θ\partial_θ)$ subject to the periodic boundary conditions on $θ\in [-π,π]$. We prove that the operator is closed in $L^2([-π,π])$ with the domain in $H^1_{\rm per}([-π,π])$ for $|ε| < 2$, its spectrum consists of an infinite sequence of isolated eigenvalues and the set of corresponding eigenfunctions is complete. By using numerical approximations of eigenvalues and eigenfunctions, we show that all eigenvalues are simple, located on the imaginary axis and the angle between two subsequent eigenfunctions tends to zero for larger eigenvalues. As a result, the complete set of linearly independent eigenfunctions does not form a basis in $H^1_{\rm per}([-π,π])$.
description: 22 pages, 10 figures
Analyzing invasive plant patterns along the Kalaupapa coast
Creators: name: Gross, Jacob
name: Simon, Melissa
name: Corie Yanger
name: Ainsworth, Alison
Publisher: name: F1000Research
Year: 2015

description: Moloka‘i’s north shore, which includes Kalaupapa National Historical Park (KALA), houses a significant portion of the remaining native coastal vegetation in Hawai‘i. Non-native, invasive plants pose a direct threat to this unique coastal ecosystem and inhibit the preservation and interpretation of KALA’s cultural history. Understanding the patterns of plant invasion in this area can help resource managers implement more effective conservation strategies. Non-native plants along the KALA coast were systematically sampled in 2012 using 25 belt transects ranging from 140 to 300 m oriented perpendicularly to the coastline. Transects were composed of contiguous rectangular plots (5 × 10 m) within which abundance of all non-native plants was recorded. Non-native species richness, frequency, and cover were evaluated along with distance from coastline and substrate type. Each metric for non-native plants increased with distance from the shoreline, and plots with a rocky substrate contained more non-native species with higher frequency and cover than plots with a sandy substrate.  Bermuda grass (Cynodon dactylon) had the highest frequency of occurrence in both rocky and sandy substrates.  Mapping of observed plant patterns was conducted to help apply these results directly to resource management activities. Transects will be revisited every five years (starting in 2017) to detect temporal changes in non-native plant establishment. Early detection of increasing trends in non-native plant distribution and abundance will aid managers in devising conservation strategies that are both timely and cost-effective.
A network based method to analyze non-covalent interactions in proteins
Creators: name: J. Sebastian Contreras-Riquelme
Publisher: name: F1000Research
Year: 2015

description: A protein can be seen as a set of amino acid residues bonded among them through a set of interactions. However it is the non-covalent interactions between amino acid residues the one that define the tridimensional structure of proteins. With this concept in mind, we built a tool to construct and analyze networks of non-covalent interactions within protein structures. These networks can be useful to generate new knowledge on protein function and stability, extracting and calculating features to describe amino acid residue interactions in order to specify their relevance in protein structures. To build a residue interaction network, we consider the position, radius and charge of each atom forming a protein. Then we identify interactions such as hydrogen bonds, Salt Bridges, van der Waals, Coulomb, cation-π and π-π interactions. To further describe the network, we assign attributes to each amino acid residue such as solvent accessibility and secondary structure. Our method provides new means to study the contribution of each residue on the stability and function of protein structures providing an holistic vision that entangles physicochemical properties of amino acid residues with their interaction network. An extended version of this method will allow us to study how the interaction network changes along time using trajectories generated by molecular dynamics simulations of proteins. Both methods will soon be available as a webserver.
Feshbach Resonance and Growth of a Bose-Einstein Condensate
Creators: name: Yuce, C.
name: Kilic, A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: Gross-Pitaevskii equation with gain is used to model Bose Einstein condensation (BEC) fed by the surrounding thermal cloud. It is shown that the number of atoms continuously injected into BEC from the reservoir can be controlled by applying the external magnetic field via Feshbach resonance.
description: 4 pages
Entanglement and Many-Body effects in Collective Neutrino Oscillations
Creators: name: Roggero, Alessandro
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Collective neutrino oscillations play a crucial role in transporting lepton flavor in astrophysical settings, such as supernovae, where the neutrino density is large. In this regime, neutrino-neutrino interactions are important and simulations in the mean-field approximation show evidence for collective oscillations occurring at time scales much larger than those associated with vacuum oscillations. In this work, we study the out-of-equilibrium dynamics of a corresponding spin model using Matrix Product States and show how collective bipolar oscillations can be triggered by many-body correlations if appropriate initial conditions are present. We find entanglement entropies scaling at most logarithmically in the system size suggesting that classical tensor network methods could be efficient in describing collective neutrino dynamics more generally. These observation provide a clear path forward, not only to increase the accuracy of current simulations, but also to elucidate the mechanism behind collective flavor oscillations without resorting to the mean field approximation.
description: 13 pages, 7 figures, added discussion on numerical errors and a direct comparison with mean field, published version
Møller's Energy in the Kantowski-Sachs Space-time
Creators: name: Abdel-Megied, M.
name: Gad, Ragab M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We present a counter example to paper \cite{P71} and show that the result obtained is correct for a class of metric but not general. We calculate the total energy of the Kantowski-Sachs space-time by using the energy-momentum definitions of Møller in the theory of general relativity and the tetrad theory of gravity.
description: 7 pages and no figures
A high-precision search for magnetic field oscillations in the roAp star HD 24712
Creators: name: Kochukhov, O.
name: Wade, G. A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have obtained a time series of 81 high-cadence circular polarization observations of the rapidly oscillating Ap star HD 24712 with the new ESPaDOnS spectropolarimeter at CFHT. We used the high-S/N, high-resolution Stokes I and V spectra to investigate possible variation of the mean longitudinal field over the pulsation cycle in this roAp star. Our multiline magnetic field and radial velocity measurements utilized 143 spectral lines of rare-earth elements, attaining precision better than 13 G and 19 m/s, respectively. A multiperiodic radial velocity variation with an amplitude of 40-136 m/s is clearly detected at the known pulsation frequencies of HD 24712. At the same time, no evidence for pulsational changes of the magnetic field can be found. We derive a 3sigma upper limit of 10 G, or about 1% of the mean longitudinal field strength, for magnetic field oscillations in the upper atmosphere of HD 24712. The absence of detectable pulsational variability of the magnetic field provides a valuable constraint for the interaction between pulsations and magnetic field in roAp stars and is compatible with the recent predictions of detailed theoretical models of stellar magnetoacoustic oscillations.
description: 5 pages, 2 figures; accepted by A&A
Pairing in Asymmetrical Fermi Systems with Intra- and Inter-Species Correlations
Creators: name: Liao, Renyuan
name: Quader, Khandker F.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Nuclear Theory (nucl-th)
subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: We consider inter- and intra-species pairing interactions in an asymmetrical Fermi system. Using equation of motion method, we obtain coupled mean-field equations for superfluid gap functions and population densities. We construct a phase diagram across BCS-BEC regimes. Due to intra-species correlations, the BCS singlet superfluid state can sustain finite polarizations, $P$. For larger $P$, we find phase separations in BCS and BEC regimes. A superfluid phase exists for all $P$ deep in BEC regime. Our results may apply to pairing in ultracold fermions, nuclear and quark matter physics.
description: Contents revised. Added references
Temperature dependence of the spectral weight in p- and n-type cuprates: a study of normal state partial gaps and electronic kinetic energy
Creators: name: Bontemps, N.
name: Lobo, R. P. S. M.
name: Santander-Syro, A. F.
name: Zimmers, A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: The optical conductivity of CuO2 (copper-oxygen) planes in p- and n-type cuprates thin films at various doping levels is deduced from highly accurate reflectivity data. The temperature dependence of the real part sigma1(omega) of this optical conductivity and the corresponding spectral weight allow to track the opening of a partial gap in the normal state of n-type Pr{2-x}Ce(x)CuO4 (PCCO), but not of p-type Bi2Sr2CaCu2O(8+delta} (BSCCO) cuprates. This is a clear difference between these two families of cuprates, which we briefly discuss. In BSCCO, the change of the electronic kinetic energy Ekin - deduced from the spectral weight- at the superconducting transition is found to cross over from a conventional BCS behavior (increase of Ekin below Tc to an unconventional behavior (decrease of Ekin below Tc) as the free carrier density decreases. This behavior appears to be linked to the energy scale over which spectral weight is lost and goes into the superfluid condensate, hence may be related to Mott physics.
Reconstructing the phylogeny of Corynebacteriales while accounting for Horizontal Gene Transfer
Creators: name: Darn Nilson
name: Aristoteles Goés
name: Azevedo, Vasco
name: Ouangraoua, Aïda
Publisher: name: F1000 Research Limited
Year: 2019

description: Horizontal Gene Transfer (HGT) is a common mechanism in bacteria that affects the genomic content of extant organisms. However, most traditional methods for bacterial phylogeny reconstruction assume only vertical inheritance in the evolution of homologous genes. Here, we present a new method for bacterial phylogeny reconstruction that accounts for the presence of genes acquired by HGT in genomes. A gene tree-based method was devised to identify and correct putative transferred genes (PTG). The method is applied to the reconstruction of the phylogeny of the Order Corynebacteriales, the largest clade in the Phylum Actinobacteria.
Analyse des besoins langagiers des footballeurs en mobilité professionnelle sur le territoire européen:
Creators: name: Σχισμένου, Ξένια Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: γλωσσικές ανάγκες
ποδοσφαιριστές
ευρωπαϊκός χώρος
linguistic needs
footballers
European territory

description: Η παρούσα έρευνα εντάσσεται στο πεδίο της ανίχνευσης- ανάλυσης γλωσσικών αναγκών για ειδικούς σκοπούς. Το θεωρητικό πλαίσιο που στηρίζει την έρευνά μας είναι η επικοινωνιακή προσέγγιση της διδασκαλίας της γλώσσας, η οποία δίνει έμφαση στην αποτελεσματικότητα της γλωσσικής επικοινωνίας και δίνει προτεραιότητα στην επικοινωνιακή ικανότητα του διδασκομένου. Στόχοι της έρευνας μας ήταν αρχικά να διαπιστώσουμε εάν η ομάδα-στόχος μας, δηλαδή οι επαγγελματίες ποδοσφαιριστές που μετακινούνται στον ενιαίο ευρωπαϊκό χώρο, αντιμετωπίζουν μια πραγματική ανάγκη για να επικοινωνήσουν σε τουλάχιστον μια ξένη γλώσσα. Ο δεύτερος στόχος της έρευνάς μας ήταν να διερευνήσουμε εάν είναι δυνατόν να συλλάβουμε και εν συνεχεία να αναπτύξουμε ένα διδακτικό υλικό ad hoc, που θα μπορούσε να ανταποκριθεί στις επικοινωνιακές ανάγκες των επαγγελματιών ποδοσφαιριστών που μετακινούνται στον ενιαίο ευρωπαϊκό χώρο, όσον αφορά τις ξένες γλώσσες. Ως εργαλείο για την έρευνα μας χρησιμοποιήσαμε το γραπτό ερωτηματολόγιο, και βάσει των αποτελεσμάτων που λάβαμε δημιουργήσαμε ένα αντικείμενο αναφοράς που περιγράφει συνοπτικά τις γλωσσικές ανάγκες των ποδοσφαιριστών αναφορικά με τις ξένες γλώσσες.
description: The present research is integrated in the field of the detection-analysis of the linguistic needs for specific purposes. The theoretical framework which supports our research is the communicative approach in language teaching, which emphasizes to the efficacy of the verbal communication and gives priority to the communicative competence of the learner. Objective of this research was firstly to ascertain that our target-group, to wit the professional footballers who move around the European territory, face a real need to communicate in at least one language. The second objective of our research was to investigate if it was possible to concept and then develop a teaching material ad hoc, which could respond to the communicative needs of the professional football players who move around the European territory, for the domain of foreign languages. The tool that we used for our research was the written questionnaire, and based to the results we got, we created a framework which describes in brief the linguistic needs regarding the foreign languages.
Bulk and Spectral Observables in Lattice QCD
Creators: name: Hatsuda, Tetsuo
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We review recent developments in lattice siumulations of the equation of state, order of the thermal phase transition and the determination of the pseudo-critical temperature in (2+1)-flavor QCD. Owing to the increasing computer power, new argothithms, and improved fermion formulations, studies of bulk QCD matter are approaching to the stage of precision science. We also review recent lattice studies on the spectral properties of heavy quarkoniums inside the quark-gluon plasma (QGP). Although they are still in an exploratory stage, interesting physics in relation to the strongly correlated QGP is being extracted.
description: 9 pages, 8 figures, invited review talk at Quark Matter 2006
Rotation-activity relations and flares of M dwarfs with K2 long- and short-cadence data
Creators: name: Raetz, St
name: Stelzer, B
name: Damasso, M
name: Scholz, A
Publisher: name: Zenodo
Year: 2021
Subjects: Cool Stars on the main sequence

description: Studies of the rotation-activity relation of late-type stars are essential to enhance our understanding of stellar dynamos and angular momentum evolution. Photometric observations with space telescopes provide rotation periods even with low amplitudes as well as a wealth of activity diagnostics. Our previous study of the rotation-activity relation based on photometric activity indicators from long cadence K2 data revealed, that, at a critical rotation period of ~10d, the activity level changes abruptly. This phenomenon represents an open problem within the framework of dynamo theory. We have now extended our work to K2 short cadence data to examine a possible influence of the data sampling on the shape of the rotation-activity relation, in particular with respect to the different sensitivity to the detection of stellar flares. Our sample comprises 56 bright and nearby M dwarfs observed by K2 during campaigns C0-C18 in long and short cadence mode. In my poster I will show the results of our K2 study with a special focus on stellar flares. I will show how a higher data cadence improves the detection and analysis of such events. The analysis of the short cadence light curves results in a 4.6 times higher flare rate than the long cadence data. We confirm in the short cadence data the abrupt change of the activity level in the rotation-activity relation at a critical period of ~10d. This change is most drastic in the flare duration and the flare frequency for short cadence data. Our flare studies revealed that the highest flare rates are not found among the fastest rotators and that the stars with the highest flare rates do not show the most energetic flares. Finally, we found a ~2 times larger superflares frequency for the fast rotating M stars than for solar-like stars in the same period range.
description: {"references": ["Raetz et al. (2020). 2020A&A...637A..22R", "Raetz et al. (2020). 2020AN....341..519R"]}
Variation of Protoplanetary Disk Response with Adiabatic Index, Viscosity and Mass.
Creators: name: Gogoi, Dhritimaan
name: Saikia, Eeshankur
Publisher: name: Zenodo
Year: 2021
Subjects: Stellar systems, clusters, and associations, Others

description: The protoplanetary disk is under constant perturbing forces that influences its evolution. Previous simulations studies have tried to model such a disk comprising of gas and dust for different Equation of State that completes the N- S equations solved in such a numerical approach. Along with it viscosity in the materials of such disk are studied as key parameter. We reproduced such scenarios of the disk under different host stellar mass, Kinematic viscosity ‘ν’ and Adiabatic Index ‘γ’ and found that no dependence exist for ‘ν’ with host mass and also the disk mass. Final state of the disk after evolving for a period in time varied with ‘γ’, describing the Adiabatic Equation’s dependence. The variation of the disk repsonse was higher for the lower mass star.
description: {"references": ["Roman R. Rafikov. Protoplanetary Disks as (Possibly) Viscous Disks. The Astrophysical Journal, 837(2):163, mar 2017.", "B. Bitsch, A. Boley, and W. Kley. Influence of viscosity and the adiabatic index on planetary migration. Astronomy & Astrophysics, 550:A52, feb 2013", "A. Mignone, M. Flock, M. Stute, S. M. Kolb, and G. Muscianisi. A conservative orbital advection scheme for simulations of magnetized shear flows with the PLUTO code. Astronomy and Astrophysics, 545:A152, sep 2012.", "A. Mignone, G. Bodo, S. Massaglia, T. Matsakos, O. Tesileanu, C. Zanni, and A. Ferrari. PLUTO: A Numerical Code for Computational Astrophysics. The Astrophysical Journal Supplement Series, 170(1):228\u2013242, may 2007."]}