cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
High-Resolution Spectroscopy of Extremely Metal-Poor Stars from SDSS/SEGUE: II. Binary Fraction
Creators: name: Aoki, Wako
name: Suda, Takuma
name: Beers, Timothy C.
name: Honda, Satoshi
Publisher: name: arXiv
Year: 2014
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The fraction of binary systems in various stellar populations of the Galaxy and the distribution of their orbital parameters are important but not well-determined factors in studies of star formation, stellar evolution, and Galactic chemical evolution. While observational studies have been carried out for a large sample of nearby stars, including some metal-poor, Population II stars, almost no constraints on the binary nature for extremely metal-poor (EMP; [Fe/H] < -3.0) stars have yet been obtained. Here we investigate the fraction of double-lined spectroscopic binaries and carbon-enhanced metal-poor (CEMP) stars, many of which could have formed as pairs of low-mass and intermediate-mass stars, to estimate the lower limit of the fraction of binary systems having short periods. The estimate is based on a sample of very metal-poor stars selected from the Sloan Digital Sky Survey, and observed at high spectral resolution in a previous study by Aoki et al. That survey reported three double-lined spectroscopic binaries and 11 CEMP stars, which we consider along with a sample of EMP stars from the literature compiled in the SAGA database. We have conducted measurements of the velocity components for stacked absorption features of different spectral lines for each double-lined spectroscopic binary. Our estimate indicates that the fraction of binary stars having orbital periods shorter than 1000 days is at least 10 %, and possibly as high as 20 %, if the majority of CEMP stars are formed in such short-period binaries. This result suggests that the period distribution of EMP binary systems is biased toward short periods, unless the binary fraction of low-mass EMP stars is significantly higher than that of other nearby stars.
description: 20 Pages, 3 figures, accepted publication in Astronomical Journal
title: Προσομοίωση δυναμικής μικροφυσαλίδας (Contrast Agents) σε περιβάλλον υπερήχων
titleType: AlternativeTitle
Creators: name: Τσιγκλιφής, Κωνσταντίνος
Publisher: name: University of Thessaly
Year: 2005
Subjects: subject: ΡΕΥΣΤΟΜΗΧΑΝΙΚΗ
subject: ΦΥΣΑΛΙΔΕΣ -- ΔΥΝΑΜΙΚΗ

description: Οι μικροφυσαλίδες τύπου Contrast Agent έχουν αρχίσει να χρησιμοποιούνται από τα τέλη του προηγούμενου αιώνα τόσο στη διαγνωστική ιατρική, π.χ. αγγειογραφία και διάγνωση διάφορων μορφών καρκίνου των εσωτερικών οργάνων μεταξύ άλλων, όσο και στην θεραπεία διαφόρων ασθενειών, π.χ. θεραπεία καρκίνου και γονιδιακή θεραπεία με πολύ αξιόλογα αποτελέσματα. Αν και η ανάπτυξη των κλινικών μεθόδων αυτών έχει βασιστεί σε πειράματα τόσο μέσα σε ζωντανούς οργανισμούς (in vivo) όσο και εκτός αυτών (in vitro), υπάρχουν ακόμα αναπάντητα ερωτήματα που αφορούν στη δυναμική συμπεριφορά των σωματιδίων αυτών. Στην παρούσα μεταπτυχιακή εργασία γίνεται προσπάθεια προσομοίωσης της δυναμικής συμπεριφοράς ενός τέτοιου σωματιδίου, θεωρώντας αρχικά μόνο σφαιροσυμμετρικές ταλαντώσεις, όταν υπόκειται σε διαταραχή της εξωτερικής πίεσης. Στη συνέχεια γίνεται προσομοίωση της αξονοσυμμετρικής ταλαντώσης και κατάρρευσης μιας μικροφυσαλίδας σε παρόμοιο ακουστικό περιβάλλον. Τέλος, τα αριθμητικά αποτελέσματα συγκρίνονται με αντίστοιχα πειράματα, απ’ όπου φαίνεται πολύ καλή συμφωνία μοντέλου - πειράματος. Από τα αποτελέσματα φαίνεται ότι η ελαστικότητα της μεμβράνης παίζει καθοριστικό ρόλο τόσο στην απόκριση της μικροφυσαλίδας όσο και στον τρόπο κατάρρευσής της.
title: Ανάπτυξη κώδικα πεπερασμένων στοιχείων για την ροή συνοριακού στρώματος πάνω από στερεές επιφάνειες ή υγρό φίλμ
titleType: AlternativeTitle
Creators: name: Βλαχομήτρου, Μαρία
Publisher: name: University of Thessaly
Year: 2006
Subjects: subject: ΡΕΥΣΤΟΜΗΧΑΝΙΚΗ
subject: ΜΕΘΟΔΟΣ ΠΕΠΕΡΑΣΜΕΝΩΝ ΣΤΟΙΧΕΙΩΝ

description: Στην παρούσα μεταπτυχιακή εργασία εξετάζεται η ευστάθεια στρωτού οριακού στρώματος αέρα που ρέει με υψηλό αριθμό Re πάνω από οριζόντια πλάκα στην οποία είτε υπάρχει κάποιο εμπόδιο, είτε έχει καλυφθεί από λεπτό υμένα υγρού. Η περίπτωση της ροής πάνω από λεπτό φιλμ συναντάται σε πτερύγια αεροσκαφών κάτω από συνθήκες βροχόπτωσης, καθώς και σε περιπτώσεις όπου λαμβάνει χώρα συμπύκνωση ατμών π.χ εναλλάκτες θερμότητας. Για την προσομοίωση των παραπάνω ροών χρησιμοποιούνται τα μοντέλα που προτείνει η θεωρία τριπλής στιβάδας. Η αριθμητική επίλυση γίνεται με τη μέθοδο των Πεπερασμένων Στοιχείων με διδιάστατες συναρτήσεις βάσης cubic splines, ενώ όπου απαιτείται χρονική ολοκλήρωση χρησιμοποιείται η Runge Kutta τέταρτης τάξης. Στα πλαίσια μελέτης των παραπάνω ροών γίνεται προσπάθεια να αντιμετωπιστούν τα προβλήματα που προκύπτουν κατά την αριθμητική επίλυση. Οι αυξημένες απαιτήσεις σε υπολογιστικό χρόνο κατά την προσομοίωση της ροής αέρα πάνω από το υγρό φιλμ αντιμετωπίζονται μεταξύ άλλων με την εφαρμογή της επαναληπτικής μεθόδου GMRES για την επίλυση των εξισώσεων του αέρα. Τέλος, ανακτώνται τα αποτελέσματα της γραμμικής ανάλυσης ευστάθειας για τα κύματα Tollmien- Schlichting και τα διεπιφανειακά, και παράλληλα μελετάται ο μηχανισμός δημιουργίας και απόσπασης δινών ανακυκλοφορίας καθώς και οι συνθήκες εμφάνισης της αστάθειας Rayleigh.
Critical States Embedded in the Continuum
Creators: name: Koirala, M.
name: Yamilov, A.
name: Basiri, A.
name: Bromberg, Y.
name: Cao, H.
name: Kottos, T.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We introduce a class of critical states which are embedded in the continuum (CSC) of one-dimensional optical waveguide array with one non-Hermitian defect. These states are at the verge of being fractal and have real propagation constant. They emerge at a phase transition which is driven by the imaginary refractive index of the defect waveguide and it is accompanied by a mode segregation which reveals analogies with the Dicke super -radiance. Below this point the states are extended while above they evolve to exponentially localized modes. An addition of a background gain or loss can turn these localized states to bound states in the continuum.
description: 4.5 pages, 3 figures, 1 page of supplementary material including one figure
title: Transport of the Tiny-OS environment to the smart-its platform : a thesis by
titleType: AlternativeTitle
Creators: name: Λούκος, Φώτης
Publisher: name: University of Thessaly
Year: 2006
Subjects: subject: ΗΛΕΚΤΡΟΝΙΚΟΙ ΥΠΟΛΟΓΙΣΤΕΣ -- ΛΕΙΤΟΥΡΓΙΚΑ ΣΥΣΤΗΜΑΤΑ
subject: ΕΠΙΚΟΙΝΩΝΙΑ -- ΔΙΚΤΥΑ ΠΛΗΡΟΦΟΡΗΣΗΣ

description: The smart-its are a low-cost platform made by the university of Karlsruhe used mainly for wireless sensor network applications. This thesis sentences the port of TinyOS to the smart-its platform. TinyOS is a wireless sensor network operating system originally written to work with the mica motes from the Berkeley University; since then a number of ports have been made. During the port a number of problems came up due to the fact that the smart-its use a completely different hardware from the other platforms TinyOS supports. All the problems together with the solutions are presented. Tests of the RF communications and their results are displayed.
title: Τούρμπο τεχνικές για κωδικοποίηση και εξισορρόπηση καναλιού σε τηλεπικοινωνιακά συστήματα
titleType: AlternativeTitle
Creators: name: Χατζούλης, Δημήτριος Ζ.
Publisher: name: University of Thessaly
Year: 2006
Subjects: subject: ΤΗΛΕΠΙΚΟΙΝΩΝΙΑ
subject: ΤΗΛΕΠΙΚΟΙΝΩΝΙΑΚΑ ΣΥΣΤΗΜΑΤΑ

description: Παρατηρήσεις έκδοσης: χαμηλής ποιότητας εκτύπωση.
description: Στη παρούσα μεταπτυχιακή διπλωματική εργασία γίνεται μία προσπάθεια να αναλυθούν οι τεχνικές επαναληπτικής ισοστάθμισης και αποκωδικοποίησης, οι οποίες από το 1995 που προτάθηκαν έχουν εξελιχθεί σε μία από τις πολλά υποσχόμενες τεχνικές ισοστάθμισης και αποκωδικοποίησης, αφού οι απόδοση τους τις περισσότερες φορές αγγίζει το βέλτιστο δυνατό. Πέραν των κλασσικών μεθόδων που έχουν προταθεί στη διεθνή βιβλιογραφία, η ανάλυση μας θα επεκταθεί και σε τρεις νέες τεχνικές χαμηλής πολυπλοκότητας, τις οποίες προτείνουμε στην εργασία αυτή και τις οποίες θα συγκρίνουμε με άλλες ήδη καθιερωμένες τεχνικές ίδιας πολυπλοκότητας. Στο σημείο αυτό θα ήθελα να ευχαριστήσω τον καθηγητή Μουστακίδη Γεώργιο και επιβλέποντα αυτής της εργασίας, ο οποίος μου έδωσε τη δυνατότητα να ασχοληθώ με το θέμα αυτό. Η αδιάλειπτη υποστήριξη του καθώς και οι εύστοχες παρατηρήσεις και προτάσεις του ήταν καθοριστικές στην περάτωση της παρούσης εργασίας. Η εργασία γράφτηκε εξολοκλήρου σε Ι5ΙΕΧ2ε, με τη βοήθεια του ΜΐΚΤ£Χ2.4 και χρησιμοποιώντας τις εφαρμογές T£XnicCenter, TTXAide και TpX. Οι προσομοιώσεις έγιναν σε MATLAB 6.5.
Emergence of vortices at the edges of planet-driven gaps in protoplanetary discs
Creators: name: Cimerman, Nicolas P.
name: Rafikov, Roman R.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Young planets embedded in protoplanetary discs (PPDs) excite spiral density waves, which propagate, shock and deposit angular momentum in the disc. This results in gap opening around the planetary orbit, even for low (sub-thermal) mass planets, provided that the effective viscosity in the disc is low. The edges of these planet-induced gaps are known to be prone to emergence of observable vortices via the Rossby Wave Instability (RWI). We study timescales for the development of vortices driven by low mass planets in inviscid discs. We employ a recently developed semi-analytical theory of vortensity production by the planet-driven shock to predict vortensity evolution near the planet, from which we derive the radial profile of the planet-induced gap as a function of time (this procedure can have multiple other uses, e.g. to study dust trapping, suppression of pebble accretion, etc.). We then analyze the linear stability of the gap edges against the RWI, obtaining the timescales for the first appearance of unstable modes and (later) fully developed vortices at gap edges. We present useful formulae for these timescales as functions of planetary and disc parameters and provide their physical justification. We also thoroughly test our semi-analytical framework against high resolution 2D hydrodynamic simulations, confirming the accuracy of our theoretical predictions. We discuss ways in which our semi-analytical framework can be extended to incorporate additional physics, e.g. planetary accretion, migration, and non-zero disc viscosity. Our results can be used to interpret observations of PPDs and to predict emergence of vortices in simulations.
description: 21 pages, 17 figures, accepted in MNRAS
Dalla scena elisabettiana al teatro di figura: La tempesta di Shakespeare nella traduzione di Eduardo De Filippo
Creators: name: Sapienza, Annamaria
Publisher: name: Roma : Carocci
Year: 2013
Subjects: Eduardo De Filippo
The Tempest
Colla brothers

description: In 1983, a year before his death, Eduardo De Filippo translates in seventeenth-century Neapolitan language The Tempest by William Shakespeare (for the Einaudi publishing house in the series Writers translated by writers), making it a unique masterpiece of its kind. The work is recorded, thanks to the intervention of Ferruccio Marotti, by University of Rome in audio format only. After the death of Eduardo, during the Venice Biennale of 1985, the famous company of puppeteers, the Colla brothers lends his “figures” to the voice of Eduardo creating a unique and fascinating version of the Shakespearean play in which the Neapolitan sounds strongly characterize the recording of the Neapolitan playwright. The essay aims to analyze the reasons and the steps that led to the transmigration of Shakespeare’s masterpiece from the English tradition to that of Naples, from the literary code to the vernacular. In particular, the survey aims to identify the suggestions arising from different expressive languages: from writing to theater, from impalpable voice to the materiality of the puppets, in the incessant research of the endless possibilities offered by the theatrical performance.
The Use of Serious Games as an Educational and Dissemination Tool for Archaeological Heritage Potential and Challenges for the Future
Creators: name: Mariotti, Samanta
Publisher: name: S. Mariotti, The Use of Serious Games as an Educational and Dissemination Tool for Archaeological Heritage Potential and Challenges for the Future, «Magazén», 2, 2021, n. 1, pp. 119-13
Year: 2021
Subjects: Archaeology
Digital technologies
Game-based learning
Edutainment
Serious games
Heritage enhancement
Public engagement

description: In the last decades, digital technologies have pervaded every aspect of the production of archaeological knowledge and they have been massively used to communicate the past. This contribution analyses the potential and benefits of serious games as they appear a promising tool for engaging the users in active learning of cultural contents, for attracting new audiences and promoting knowledge and awareness around archaeological heritage. Moreover, the need for multidisciplinary collaborations between archaeologists and developers and the necessity of assessment studies on learning levels to implement their effectiveness will be highlighted.
Grimpoteuthis Robson 1932
Creators: name: Ziegler, Alexander
name: Sagorny, Christina
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Mollusca
Cephalopoda
Octopoda
Grimpoteuthidae
Grimpoteuthis

description: Genus Grimpoteuthis Robson, 1932 Type species: Cirroteuthis umbellata Fischer, 1883: 404. By original designation, Robson 1932: 137.
description: Published as part of Ziegler, Alexander & Sagorny, Christina, 2021, Holistic description of new deep sea megafauna (Cephalopoda: Cirrata) using a minimally invasive approach, pp. 1-14 in BMC Biology 19 (81) on page 4, DOI: 10.1186/s12915-021-01000-9, http://zenodo.org/record/5615449
title: Ολοκληρωμένο σύστημα καταγραφής δεδομένων για ασύρματα δίκτυα αισθητήρων
titleType: AlternativeTitle
Creators: name: Νικολάου, Θεόφιλος
Publisher: name: University of Thessaly
Year: 2006
Subjects: subject: ΗΛΕΚΤΡΟΝΙΚΟΙ ΥΠΟΛΟΓΙΣΤΕΣ -- ΔΙΚΤΥΑ
subject: ΗΛΕΚΤΡΟΝΙΚΟΙ ΥΠΟΛΟΓΙΣΤΕΣ -- ΕΠΕΞΕΡΓΑΣΙΑ ΔΕΔΟΜΕΝΩΝ

description: Σκοπός της εργασίας είναι η ανάπτυξη μιας διαδικτυακής διεπαφής (web based interface) για την απεικόνιση των δεδομένων που συλλέγονται από ένα δίκτυο ασύρματων αισθητήρων. Η απεικόνιση των δεδομένων γίνεται είτε με την μορφή γραφημάτων είτε με την μορφή πινάκων. Η λειτουργία του συστήματος που υλοποιήθηκε συνοψίζεται στα εξής: Τα δεδομένα που συλλέγονται από τους κόμβους αισθητήρες αποθηκεύονται σε μια βάση δεδομένων. Ο χρήστης, μέσω της γραφικής διεπαφής, υποβάλλει το αίτημά του για εμφάνιση δεδομένων που συμφωνούν με ορισμένα κριτήρια που έχει επιλέξει (δεδομένα συγκεκριμένου κόμβου, συγκεκριμένης χρονικής περιόδου κ.α.) και ο εξυπηρετητής συλλέγει τις απαραίτητες πληροφορίες από τη βάση δεδομένων που αφορούν αυτό το αίτημα του χρήστη. Τέλος, τα δεδομένα - αποτελέσματα εμφανίζονται στο χρήστη με μορφή γραφημάτων ή πινάκων.
Very high energy emission mechanism in the extreme blazar PGC 2402248
Creators: name: Medina-Carrillo, B.
name: Sahu, Sarira
name: Sánchez-Colón, G.
name: Rajpoot, Subhash
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Extreme high-frequency peaked BL Lacs (EHBLs) are characterized by a synchrotron peak frequency exceeding $10^{17}$ Hz and a second peak that can be in the energy range of few GeVs to several TeVs. The MAGIC telescopes detected multi-TeV gamma-rays on April 19, 2018 for the first time from the EHBL PGC 2402248 which was simultaneously observed in multiwavelength by several other instruments. The broad band spectral energy distribution of the source is conventionally modelled using the leptonic and the hadronic models. Due to the success of the photohadronic model in interpreting the enigmatic very high-energy (VHE) flaring events from many high-energy blazars, we extend this model to explain the VHE events from PGC 2402248 observed by MAGIC telescopes and compare our results with other models. We conclude that the photohadronic fits are comparable and even fare better than most other models. Furthermore, we show that the spectrum is not hard and is in a low emission state. The estimated bulk Lorentz factor for this flaring event is found to be $\lesssim 34$.
Cohomogeneity One Three Dimensional Anti de Sitter Space, Proper and Nonproper Actions
Creators: name: Ahmadi, Parviz
Publisher: name: arXiv
Year: 2014
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 53C30, 53C30, 57S25

description: In this paper we give a classification of closed and connected Lie groups, up to conjugacy in $Iso({\bf adS_3})$, acting by cohomogeneity one on the three dimensional anti de sitter space ${\bf adS_3}$. Then we determine causal characters of the orbits and the orbit spaces, up to homeomorphism, in both cases, proper and nonproper actions. When the action is proper, we show that there is no exceptional orbit and causal characters of the principal orbits are the same.
description: arXiv admin note: text overlap with arXiv:1410.2565
Moving and merging of Dirac points on a square lattice and hidden symmetry protection
Creators: name: Hou, Jing-Min
Publisher: name: arXiv
Year: 2014
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: First, we study a square fermionic lattice that supports the existence of massless Dirac fermions, where the Dirac points are protected by a hidden symmetry. We also consider two modified models with a staggered potential and the diagonal hopping terms, respectively. In the modified model with a staggered potential, the Dirac points exist in some range of magnitude of the staggered potential, and move with the variation of the staggered potential. When the magnitude of the staggered potential reaches a critical value, the two Dirac points merge. In the modified model with the diagonal hopping terms, the Dirac points always exist and just move with the variation of amplitude of the diagonal hopping. We develop a mapping method to find hidden symmetries evolving with the parameters. In the two modified models, the Dirac points are protected by this kind of hidden symmetry, and their moving and merging process can be explained by the evolution of the hidden symmetry along with the variation of the corresponding parameter.
Convergence estimates for the numerical approximation of homoclinic solutions
Creators: name: Sandstede, Björn
Publisher: name: Weierstrass Institute
Year: 1995
Subjects: subject: homoclinic bifurcation
subject: convergence
subject: boundary value problem
subject: 34C37
subject: 65L10

description: This article is concerned with the numerical computation of homoclinic solutions converging to a hyperbolic or semi-hyperbolic equilibrium of a system u̇ = ƒ (u, μ). The approximation is done by replacing the original problem by a boundary value problem on a finite interval and introducing an additional phase condition to make the solution unique. Numerical experiments have indicated that the parameter μ is much better approximated than the homoclinic solution. This was proved in Schecter (1995) for phase conditions fulfilling an additional "niceness" assumption, which is unfortunately not satisfied for the phase condition most commonly used in numerical experiments and which actually suggested the super-convergence result. Here, this result is proved for arbitrary phase conditions. Moreover, it is shown that it is sufficient to approximate the original boundary value problem to first order when considering semi-hyperbolic equilibria extending a result of Schecter (1993).
Spontaneous gap generation on the surface of weakly interacting topological insulators using nonmagnetic impurities
Creators: name: Black-Schaffer, Annica M.
name: Yudin, Dmitry
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Strong nonmagnetic impurities on the surface of three-dimensional topological insulators (TIs) generate localized resonance peaks close to the Dirac point. We show that this results in a strongly reduced critical Coulomb interaction strength to reach a magnetic surface state, following a Stoner-like criterion. Thus even weakly interacting TIs host a finite (local) magnetization around strong nonmagnetic impurities. The local magnetization gives rise to a global energy gap, linearly dependent on the maximum value of the magnetization but decreasing with reduced impurity concentration.
description: 4.5 pages + 1 page supplementary material, 3 figures
A semidiscrete scheme for a Penrose-Fife system and some Stefan problems in R(3)
Creators: name: Klein, Olaf
Publisher: name: Weierstrass Institute
Year: 1995
Subjects: subject: Penrose-Fife
subject: phase-field
subject: Stefan-problem
subject: semidiscretization
subject: convergence
subject: error estimates
subject: 65P05
subject: 80A22
subject: 35Q72
subject: 65M12
subject: 35R35
subject: 35R70

description: This paper is concerned with the Penrose-Fife phase-field model and some Stefan problems in which the heat flux is proportional to the gradient of the inverse absolute temperature. Recently, Colli and Sprekels proved that, as some parameters in the Penrose-Fife equations tend to zero, the corresponding solutions converge against the solutions to these Stefan problems. Following their approach, we derive a time-discrete scheme for the Penrose-Fife equations, such that analogous convergence properties hold. Furthermore, we show some error estimates and prove the existence of solutions to the scheme.
On the analogy between stochastic electrodynamics and nonrelativistic quantum electrodynamics
Creators: name: Santos, Emilio
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: I expose nonrelativistic quantum electrodynamics in the Weyl-Wigner representation. Hence I prove that an approximation to first order in Planck constant has formal analogy with stochastic electrodynamics (SED), that is classical electrodynamics of charged particles immersed in a random radiation filling space. The analogy elucidates why SED agrees with quantum theory for particle Hamiltonians quadratic in coordinates and momenta, but fails otherwise.
Transport equations with singularity
Creators: name: Babovsky, Hans
name: Milstein, Grigori N.
Publisher: name: Weierstrass Institute
Year: 1995
Subjects: subject: Kinetic equations
subject: Markov process
subject: probabilistic representation for PDE
subject: ergodicity
subject: 60H10
subject: 60G10

description: Test particle dynamics in the vicinity of singularities of ascattering medium are important for a number of physical applications, one of which is the coupling of kinetic and continuum equations in numerical simulations. Out of several relevant questions arising in this context, the paper concerns boundary conditions for the related hyperbolic system of equations in a slab between two singularities. For a linear model problem, we investigate first exit times from the slab and give a complete characterization of the stochastic particle dynamics, which provides a classification of the hyperbolic systems into Cauchy problems and into those which have to be supplemented with boundary conditions. Properties of the corresponding process like ergodicity, recurrence and asymptotic behaviour are investigated.
On the solution of an optimal recovery problem and its applications in nonparametric statistics
Creators: name: Leonov, Sergei
Publisher: name: Weierstrass Institute
Year: 1995
Subjects: subject: Asymptotic minimax risk
subject: exact constant
subject: Hölder function class
subject: optimal control
subject: compactness of support
subject: Bahadur efficiency
subject: 62G07
subject: 62G20
subject: 49J30
subject: 90C25

description: We consider a non-stochastic optimization problem which arises in various nonparametric statistical settings with Hölder function classes. We prove that the solution of this problem is finite. The application of the finiteness is illustrated via regression estimation with minimax Bahadur risk.
On the bad metallicity and phase diagrams of Fe$_{1+δ}X$ ($X$ =Te, Se, S, solid solutions): an electrical resistivity study
Creators: name: ElMassalami, M.
name: Deguchi, K.
name: Machida, T.
name: Takeya, H.
name: Takano, Y.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Based on a systematic analysis of the thermal evolution of the resistivities of Fe-based chalcogenides Fe$_{1+δ}$Te$_{1-x}X_{x}$ ($X$= Se, S), it is inferred that their often observed nonmetallic resistivities are related to a presence of two resistive channels: one is a high-temperature thermally-activated process while the other is a low-temperature log-in-$T$ process. On lowering temperature, there are often two metal-to-nonmetall crossover events: one from the high-$T$ thermally-activated nonmetallic regime into a metal-like phase and the other from the log-in-$T$ regime into a second metal-like phase. Based on these events, together with the magnetic and superconducting transitions, a phase diagram is constructed for each series. We discuss the origin of both processes as well as the associated crossover events. We also discuss how these resistive processes are being influenced by pressure, intercalation, disorder, doping, or sample condition and, in turn, how these modifications are shaping the associated phase diagrams.
description: 6 pages, 4 figures, presented at 27th International Conference on Low Temperature Physics,LT27, Argentine, 2014. To be published in J. Phys: conf. series
A Modular Algebraic Multilevel Method
Creators: name: Fuhrmann, Jürgen
Publisher: name: Weierstrass Institute
Year: 1995
Subjects: subject: algebraic multigrid
subject: preconditioning
subject: unstructured meshes
subject: 65N20
subject: 65N55

description: In this paper, we propose a modular algebraic multilevel method on unstructured meshes which is intended to generalize known methods on rectangular meshes. To define the transfer operators, we utilize the block structure of the matrix which is induced by the fine-coarse partitioning of the matrix graph and approximate the block of fine-fine couplings by a modification of its lower, respectively upper triangular part. Numerical experiments show that this approach yields a working preconditioner. Its efficiency in the current implementation depends on the amount of structure information given on input.
Expression, Oppression and Queer Bodies: A pilot study exploring the lived experiences of LGBTQ+ medical students in the UK.
Creators: name: Bintley, Helen
Publisher: name: Advanced Journal of Professional Practice
Year: 2023

description: This article details a qualitative study exploring the lived experiences of LGBTQ+ medical students in one university in the UK. Few studies exist, especially those that ARTICLES AJPP Vol 4, No1 (2023) 2 directly include LGBTQ+ voices, that explore the lived experiences of LGBTQ+ medical students. Those that exist suggest that there are significant, ongoing problems with heteronormativity in medical schools and society and more could be done to appropriately support this student population during their medical studies. Therefore, in this study the author set about exploring the lived experiences of LGBTQ+ medical students using first-person narratives to capture their lives in their own words. The author used an adapted qualitative methodology and method underpinned by philosophical concepts including post[1]structuralism and materialism to realise their study aims. Outcomes showed that fear and violence but also subversion of heteronorms, community formation and protection, and ‘queer joy’ were a significant part of the students’ lived experiences. Interpretive understandings also illustrated perceptions of ‘queer bodies’ as other and/or normative and intersectional repression and oppression as an ongoing, significant experience for participants. Here the author understands queer bodies to be constantly redefined understandings of queer identity emerging from entangled relationships between gender and sexuality ‘norms’. In line with intersectionality and decolonisation literature the author argued that medical curriculum is an act of LGBTQ+ related, epistemic violence and highlighted the importance of intersectionality and intersectional transdisciplinarity in enacting change in this respect. Finally, it is argued, in line with participants’ documented experiences that queerness and ‘’queer bodies’ are both personal and community experiences/entities and awareness of this relationship is important for re-considering LGBTQ+ related stigma and healthcare inequality.
description: Advanced Journal of Professional Practice, Vol 4 No 1 (2023)
Megaselia sepsioides Srivathsan & Hartop & Puniamoorthy & Lee & Kutty & Kurina & Meier 2019, sp. n.
Creators: name: Srivathsan, Amrita
name: Hartop, Emily
name: Puniamoorthy, Jayanthi
name: Lee, Wan Ting
name: Kutty, Sujatha Narayanan
name: Kurina, Olavi
name: Meier, Rudolf
Publisher: name: Zenodo
Year: 2019
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Phoridae
Megaselia
Megaselia sepsioides

description:  Megaselia sepsioides Hartop sp. n. urn:lsid:zoobank. org:pub: ED268DF2-A886-4C31-A4FB-6271C382DECE DNA barcode for UGC0005996 (GenBank accession: MN403533) actttatattttatttttggagcttgagctggaatagtaggtacttccttaagaatc ataattcgtgctgaattaggacacccaggagcacttattggtgatgaccaaatttat aatgtgattgttactgcacatgcttttattataattttttttatagtaatacctattataa taggaggttttggtaattgacttgtacctttaatattaggagccccagatatggcatt ccctcgaatgaataatataagtttttgaatattacctccttctttaactcttttattagc cagaagtatagtagaaaatggagctggaactggttgaacagtttatcctcctttatc ttctagaatcgctcatagtggagcttctgttgatttagcaattttctctcttcatttag ctggaatttcatctattttaggagctgtaaattttattacaacaattattaatatacga tcatcaggtattacatttgaccgaatacctctatttgtttgatctgtaggtattacag ctttattgctactcttatcacttcctgttttagctggtgctattacaatactattaaca gaccgaaattttaatacttcattttttgacccagcaggaggaggagatccaatttta taccaacatttattc. Diagnosis Well characterized by the following combination of characters: with unique semi-circular expansion with modified peg-like setae on the forefemur (Fig. 5b), hind tibia strongly constricted (Fig. 5d, e), and abdomen narrow and elongate. Three haplotypes were examined; variations in setation were observed between the main cluster and two haplotypes (Figs. 6 and 7). Only single specimens of the two distinct haplotypes were available; more specimens would be necessary to determine if these are eventually recognized as distinct species or fall within a continuum of intraspecific variation. Material examined Holotype. ♂, UGANDA: Kamwenge, Kibale National Park (00° 33 ′ 54.2 ″ N 30° 21 ′ 31.3 ″ E, 1530 m), iiixii.2010, Olavi Kurina & Swaibu Katusabe (LKCNHM UGC0005996). Paratypes. 7 ♂, UGANDA: Kamwenge, Kibale National Park (00° 33 ′ 54.2 ″ N 30° 21 ′ 31.3 ″ E, 1530 m), iii-xii.2010, Olavi Kurina & Swaibu Katusabe (LKCNHM: UGC0012899, UGC0012244, UGC0012568, UGC0003003, UGC0005864, UGC0012937, UGC0012971). Distribution Known from a single site in Kibale National Park, Uganda. Biology Unknown. Etymology Name suggested by Yuchen Ang for the sepsid-like (Diptera: Sepsidae) foreleg modification.
description: Published as part of Srivathsan, Amrita, Hartop, Emily, Puniamoorthy, Jayanthi, Lee, Wan Ting, Kutty, Sujatha Narayanan, Kurina, Olavi & Meier, Rudolf, 2019, Rapid, large-scale species discovery in hyperdiverse taxa using 1 D MinION sequencing, pp. 1-20 in BMC Biology 17 on page 10, DOI: 10.1186/s12915-019-0706-9, http://zenodo.org/record/3710853
Analytical Uncertainty Propagation for Multi-Period Stochastic Optimal Power Flow
Creators: name: Bauer, Rebecca
name: Mühlpfordt, Tillmann
name: Ludwig, Nicole
name: Hagenmeyer, Veit
Publisher: name: arXiv
Year: 2022
Subjects: subject: Systems and Control (eess.SY)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: The increase in renewable energy sources (RESs), like wind or solar power, results in growinguncertainty also in transmission grids. This affects grid stability through fluctuating energy supplyand an increased probability of overloaded lines. One key strategy to cope with this uncertainty isthe use of distributed energy storage systems (ESSs). In order to securely operate power systemscontaining renewables and use storage, optimization models are needed that both handle uncertaintyand apply ESSs. This paper introduces a compact dynamic stochastic chance-constrained DC optimalpower flow (CC-OPF) model, that minimizes generation costs and includes distributed ESSs. AssumingGaussian uncertainty, we use affine policies to obtain a tractable, analytically exact reformulation asa second-order cone problem (SOCP). We test the new model on five different IEEE networks withvarying sizes of 5, 39, 57, 118 and 300 nodes and include complexity analysis. The results showthat the model is computationally efficient and robust with respect to constraint violation risk. Thedistributed energy storage system leads to more stable operation with flattened generation profiles.Storage absorbed RES uncertainty, and reduced generation cost.
Small animal biomagnetism applications
Creators: name: Jensen, Kasper
name: Bentzen, Bo Hjorth
name: Polzik, Eugene S.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Medical Physics (physics.med-ph)
subject: Applied Physics (physics.app-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The functioning of the human brain, nervous system and heart is based on the conduction of electrical signals. These electrical signals also create magnetic fields which extend outside the human body. Highly sensitive magnetometers, such as superconducting quantum interference device magnetometers or optically pumped magnetometers, placed outside the human body can detect these biomagnetic fields and provide non-invasive measurements of e.g. brain activity, nerve impulses, and cardiac activity. Animal models are used widely in medical research, including for disease diagnostics and for drugs testing. We review the topic of biomagnetic recordings on animal models using optically pumped magnetometers, and present our experiments on detecting nerve impulses in the frog sciatic nerve and the heart beat in an isolated guinea pig heart.
description: This is a pre-print of the following chapter: K. Jensen, B. H. Bentzen, E. S. Polzik, Small Animal Biomagnetism Applications, published in Flexible High Performance Magnetic Field Sensors, edited by E. Labyt, T. Sander, R. Wakai, 2022, Springer. The final authenticated version is available online at: https://doi.org/10.1007/978-3-031-05363-4_3
Where Are Lithium-Ion Batteries? (Factsheet)
Creators: name: Office Of Research Experiences & Education
Publisher: name: UL Research Institutes
Year: 2024
Subjects: classificationCode: 400911
subject: Power electronics
classificationCode: 400803
subject: Electrical energy generation (incl. renewables, excl. photovoltaics)
classificationCode: 400507
subject: Fire safety engineering

description: Products powered by lithium-ion batteries – from wearable technology and mobile phones to satellites and electric buses – require a range of specifications for optimum and safe performance with respect to energy, power and life span. Learn about the variety of formats they are produced in.
Archaeological Interactive Report: a trait d'union between data management and semantic publication
Creators: name: Derudas, Paola
name: Nurra, Federico
Publisher: name: Zenodo
Year: 2022
Subjects: Archaeology
Excavation
3D

description: P. Derudas (Lund University) and F. Nurra (INHA) showcased the Archaeological Interactive Report (AIR), a blended online system for recording, collecting, managing the archaeological investigation data, and writing dynamic archaeological reports and other forms of editorialisations. AIR provides a possible solution to overcome the limitations of scattered archaeological excavation data, by merging the 3D visualisation platform 3DHOP with the Content Management System (CMS) Omeka S.
Inverse problems in optical tomography
Creators: name: Hünlich, Rolf
name: Model, Regine
name: Orlt, Matthias
name: Walzel, Monika
Publisher: name: Weierstrass Institute
Year: 1995

description: This preprint contains the revised version of two papers presented at the BiOS Europe '95 held at Barcelona in September 1995 (to appear in Proc. SPIE 2626). Both papers are devoted to inverse problems in optical tomography. The photon migration in highly scattering media is decribed by the diffusion equation including some absorption term and by suitable initial and boundary conditions. It represents a good approximation assuming scattering predominates over absorption. Algorithms for solving these inverse problems are an essential part in developing medical diagnostic methods based on transillumination of tissue.In the first paper R. Model, R. Huenlich: Parameter sensitivity in near infrared imaging, pp. 2-11 it is shown that the choice of boundary conditions sensitively affects the photon propagation and the output fluxes at the boundary of the object. A comparison between measurements (performed by H. Rinneberg, U. Sukowski, H. Wabnitz, Medical Measuring Techniques group of the PTB) of the time-resolved transmittance of ps laser pulses and numerical simulations leads to the result, that boundary conditions of the third kind must be used. Besides of the optical parameters the corresponding boundary parameters have been identified using an iteration method in analogy to the image reconstruction algorithm.The second paper M. Orlt, M. Walzel, R. Model: Transillumination imaging performance using time domain data, pp. 12-23 is concerned with the question of improving the image reconstruction algorithm itself. Improvements in reconstruction results may be achieved in two ways, first by adapting the detector arrangements and, secondly, by using a regularization strategy based on the Tikhonov regularization. The effectiveness of these methods is demonstrated by instructive examples concerned with the reconstruction of absorbers and scatterers, respectively.
Melanosiagon Batelka & Prokop 2021, gen. nov.
Creators: name: Batelka, Jan
name: Prokop, Jakub
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Ripiphoridae
Melanosiagon

description: Melanosiagon gen. nov. Type species. Melanosiagonserraticornis sp. nov. Etymology. Generic name is a combination of the black appearance of the specimen (Greek μελάνω) and the generic name Macrosiagon [28]. Feminine in gender. Te name is registeredunder ZooBank LSID urn:lsid:zoobank. org:act:46B9D135-5214-4999-9F2B-0BF4133F5F7F. Diagnosis. Tis genus is characterized by having a long and slender body, long elytra, acute, convex and partially dehiscent, small head, strongly flattened antero-posteriorly with vertex transversely planar, specialized mouthparts with elongated galea, bilobed ligula covered by bristles, prominent tibial spurs, tibial spur formula 2-2-2, antennae 11-segmented, mesonotal and metanotal legs with erect stiff spiniform setae, pretarsal claws serrate, abdominal segments laterally compressed, apical fields on hind wings with secondary “ghost” branches (sensu [26]: 186) and apices of hind wings asymmetrically overlapping in resting position.
description: Published as part of Batelka, Jan & Prokop, Jakub, 2021, The earliest beetle with mouthparts specialized for feeding on nectar is a parasitoid of mid-Cretaceous Hymenoptera, pp. 1-12 in BMC Ecology and Evolution (207) (207) 21 (1) on page 3, DOI: 10.1186/s12862-021-01930-6, http://zenodo.org/record/5733385
description: {"references": ["28. Hentz NM. Remarks on the use of the maxillae in coleopterous insects, with an account of two species of the family Telephoridae, and of three of the family Mordellidae, which ought to be the type of two distinct genera. Trans Am Phil Soc. Philadelphia (NS). 1830; 3, 458 - 463, pl. XV.", "26. Kukalova-Peck J, Lawrence JF. Evolution of the hind wing in Coleoptera. Can Entomol. 1993; 125: 181 - 258."]}
Electronic structure of the heavy-fermion superconductor Ce2Ni3Ge5 and its reference Ce2Ni3Si5 compound by ab initio calculations
Creators: name: Winiarski, M. J.
name: Samsel-Czekała, M.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Band structures of the pressure-induced, heavy-fermion superconductor Ce2Ni3Ge5 and its non-superconducting, mixed-valence isostructural (Ibam) counterpart Ce2Ni3Si5 have been calculated employing the full-potential local-orbital code. Both the local density approximation (LDA) and LDA+U approaches were applied. These investigations were focused particularly on the topology of the Fermi surfaces (FSs) of the compounds. The results show that the FSs are quite similar in these systems and exist in four bands, containing three-dimensional holelike and electronlike sheets. However, the specific FS nesting properties has been revealed only in Ce2Ni3Ge5. They support a previously postulated presence of antiferromagnetic spin fluctuations (SF) in the heavy-fermion superconducting state of this germanide under pressure. Such SF can be responsible for the pressure-induced unconventional superconductivity in this system.
description: 8 pages, 5 figures
title: Εποικοδομητική προσέγγιση της μάθησης : μια εφαρμογή στην εννοιολογική περιοχή της θερμότητας
titleType: AlternativeTitle
Creators: name: Κυριακίδου, Ελευθερία Διον.
Publisher: name: University of Thessaly
Year: 2006
Subjects: subject: ΦΥΣΙΚΕΣ ΕΠΙΣΤΗΜΕΣ -- ΜΕΛΕΤΗ ΚΑΙ ΔΙΔΑΣΚΑΛΙΑ (ΣΤΟΙΧΕΙΩΔΗΣ)
subject: ΕΚΠΑΙΔΕΥΣΗ, ΣΤΟΙΧΕΙΩΔΗΣ -- ΜΕΛΕΤΗ ΚΑΙ ΔΙΔΑΣΚΑΛΙΑ

description: Η παρούσα εργασία ασχολείται με μια σειρά διδασκαλιών, που πραγματοποιήθηκαν σε μαθητές/τριες 12-13 χρόνων, με αντικείμενο τη μελέτη βασικών εννοιών και φαινομένων από την εννοιολογική περιοχή της Θερμότητας. Με τη βοήθεια της διεθνούς βιβλιογραφίας, μελετώνται και παρουσιάζονται οι αρχικές αντιλήψεις των παιδιών στην αντίστοιχη θεματική ενότητα, οι οποίες και λαμβάνονται υπόψη κατά το διδακτικό σχεδιασμό. Διερευνώνται οι αρχικές αντιλήψεις των μαθητών και μαθητριών του δείγματος που χρησιμοποιήθηκε και συγκρίνονται με τις ευρεθείσες κατά τη βιβλιογραφική ανασκόπηση. Παρουσιάζεται το διδακτικό υλικό που χρησιμοποιήθηκε και αναλύεται ο τρόπος ανάπτυξής του. Τέλος γίνεται αποτίμηση των μαθησιακών αποτελεσμάτων της διδακτικής παρέμβασης.
Strong Shift Equivalence and Positive Doubly Stochastic Matrices
Creators: name: Chuysurichay, Sompong
Publisher: name: arXiv
Year: 2014
Subjects: subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics
subject: Primary 15B48, Secondary 37B10, 15A21, 15B51

description: We give sufficient conditions for a positive stochastic matrix to be similar and strong shift equivalent over $\mathbb{R}_+$ to a positive doubly stochastic matrix through matrices of the same size. We also prove that every positive stochastic matrix is strong shift equivalent over $\mathbb{R}_+$ to a positive doubly stochastic matrix. Consequently, the set of nonzero spectra of primitive stochastic matrices over $\mathbb{R}$ with positive trace and the set of nonzero spectra of positive doubly stochastic matrices over $\mathbb{R}$ are identical. We exhibit a class of $2\times 2$ matrices, pairwise strong shift equivalent over $\mathbb R_+$ through $2\times 2$ matrices, for which there is no uniform upper bound on the minimum lag of a strong shift equivalence through matrices of bounded size. In contrast, we show for any $n\times n$ primitive matrix of positive trace that the set of positive $n\times n$ matrices similar to it contains only finitely many SSE-$\mathbb R_+$ classes.
description: 12 pages
Development of a curriculum for emergency physicians to teach transesophageal echocardiography use during cardiac arrests: a Kern 6-Step model
Creators: name: Swerdlow, Barry
Publisher: name: Oregon Health and Science University
Year: 2023
Subjects: subject: Heart Arrest
subject: Emergency Medicine
subject: Echocardiography, Transesophageal
subject: Curriculum
subject: SOTL/Education scholarship
subject: Skill building

description: The primary aim of this proposal is to design a best practice curriculum to teach focused transesophageal echocardiography (TEE) skills during cardiac arrest to emergency physicians (EPs) consistent with the American College of Emergency Physicians (ACEP) guidelines. The fundamental assumption of this proposal is that EPs with prior training in transthoracic echocardiography (TTE) can proficiently acquire three standard TEE views and correctly interpret common cardiac arrest pathologies in real time after a short didactic and simulation-based curriculum. This curriculum development is predicated on a 6-step Kern model that links it to existing health care needs.
Formally Verified Native Code Generation in an Effectful JIT -- or: Turning the CompCert Backend into a Formally Verified JIT Compiler
Creators: name: Barrière, Aurèle
name: Blazy, Sandrine
name: Pichardie, David
Publisher: name: arXiv
Year: 2022
Subjects: subject: Programming Languages (cs.PL)
subject: FOS: Computer and information sciences

description: Modern Just-in-Time compilers (or JITs) typically interleave several mechanisms to execute a program. For faster startup times and to observe the initial behavior of an execution, interpretation can be initially used. But after a while, JITs dynamically produce native code for parts of the program they execute often. Although some time is spent compiling dynamically, this mechanism makes for much faster times for the remaining of the program execution. Such compilers are complex pieces of software with various components, and greatly rely on a precise interplay between the different languages being executed, including on-stack-replacement. Traditional static compilers like CompCert have been mechanized in proof assistants, but JITs have been scarcely formalized so far, partly due to their impure nature and their numerous components. This work presents a model JIT with dynamic generation of native code, implemented and formally verified in Coq. Although some parts of a JIT cannot be written in Coq, we propose a proof methodology to delimit, specify and reason on the impure effects of a JIT. We argue that the daunting task of formally verifying a complete JIT should draw on existing proofs of native code generation. To this end, our work successfully reuses CompCert and its correctness proofs during dynamic compilation. Finally, our prototype can be extracted and executed.
description: Proceedings of the ACM on Programming Languages, 2023