cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Constraints on the nature of dust particles by infrared observations
Creators: name: Kiss, Cs.
name: Abraham, P.
name: Laureijs, R. J.
name: Moor, A.
name: Birkmann, S. M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The far-infrared (FIR) emissivity of dust is an important parameter characterizing the physical properties of the grains. With the availability of stellar databases and far-infrared data from Infrared Space Observatory (ISO) it is possible to compare the optical and infrared properties of dust, and derive the far-infrared emissivity with respect to the optical extinction. In this paper we present the results of a systematic analysis of the FIR emissivity of interstellar clouds observed with ISOPHOT (the photometer onboard ISO) at least at two infrared wavelengths, one close to ~100um and one at 200um. We constructed FIR emission maps, determined dust temperatures, created extinction maps using 2MASS survey data, and calculated far-infrared emissivity for each of these clouds. We present the largest homogeneously reduced database constructed so far for this purpose. During the data analysis special care was taken on possible systematic errors. We find that far-infrared emissivity has a clear dependence on temperature. The emissivity is enhanced by a factor of usually less than 2 in the low dust temperature regime of 12K<=T_d<=14K. This result suggests larger grain sizes in those regions. However, the emissivity increase of typically below 2 restricts the possible grain growth processes to ice-mantle formation and coagulation of silicate grains, and excludes the coagulation of carbonaceous particles on the scales of the regions we investigated. In the temperature range 14K<=T_d<=16K a systematic decrease of emissivity is observed with respect to the values of the diffuse interstellar matter. Possible scenarios for this behaviour are discussed in the paper.
description: Accepted for publication in MNRAS
Christen, Gebrüder, Ursens sel. Söhne
Creators: name: [s.n.]
Publisher: name: [s.n.]
Year: 1834

description: Ort: Wil bei Olten
description: Verzeichnung=Description=Inventaire 05.07.2020 Automatisiert nach HAN-Import
description: Verzeichnung=Description=Inventaire ISAD(G) / HAN Katalogisierungsregeln für Archivbestände Detailliert
Η δικαιοσύνη στην Πολιτεία του Πλάτωνα:
Creators: name: Ανυσίου, Χριστιάνα Ιωάννη
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: Πλάτωνας
Δικαιοσύνη
Πολιτεία
Plato
Justice
Republic

description: Σκοπός της διατριβής ήταν η μελέτη και η ερμηνεία της έννοιας δικαιοσύνη στην Πολιτεία του Πλάτωνα. Αρχικά παρουσιάζεται το κοινωνικοπολιτικό περιβάλλον της εποχής του Πλάτωνα και στη συνέχεια εξετάζεται η γενικότερη έννοια της δικαιοσύνης στην αρχαία Ελλάδα. Έπειτα ακολουθεί μια σύντομη αναφορά στα σημαντικότερα σημεία όλης της Πολιτείας όπου εντοπίζονται και σχολιάζονται οι διάλογοι που αφορούν την δικαιοσύνη καθώς και οι τρόποι προσέγγισης της από τον Πλάτωνα μέσω της διαλεκτικής. Τέλος, γίνεται ανάλυση των πλατωνικών ορισμών της δικαιοσύνης, διαπιστώσεις για την οπτική του Πλάτωνα, μια μικρή αναφορά σε άλλα κείμενα του περί δικαιοσύνης και περιληπτική διαχρονική κριτική από την αρχαιότητα μέχρι σήμερα. Αξιολογικές κρίσεις και συμπεράσματα υπάρχουν κυρίως στο κεφάλαιο της διαχρονικής κριτικής όπως και στον επίλογο.
description: The aim of the present thesis was the study and the interpretation of definition of justice in Plato’s Republic. Initially featured the social and political environment in Plato’s era and then examined the general definition of justice in ancient Greece. Furthermore, follows a quick report of the important points in Plato’s Republic and the analysis of the way Plato represents his ideas through dialectic. Finally follows the analysis of Plato’s definitions for justice and his further thoughts, a quick report in other texts for justice and the critical view in Plato’s theory of justice from antiquity until today. In chapter of temporal critique and epilogue are the most evaluative thesis and conclusions included.
Hoerner, W. E. Posamenter
Creators: name: [s.n.]
Publisher: name: [s.n.]
Year: 1834

description: Ort: Osterburken
description: Verzeichnung=Description=Inventaire 05.07.2020 Automatisiert nach HAN-Import
description: Verzeichnung=Description=Inventaire ISAD(G) / HAN Katalogisierungsregeln für Archivbestände Detailliert
Kondo Lattice Model with Finite Temperature Lanczos Method
Creators: name: Zerec, Ivica
name: Schmidt, Burkhard
name: Thalmeier, Peter
Publisher: name: arXiv
Year: 2006
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We investigate the Kondo Lattice Model on 2D clusters using the Finite Temperature Lanczos Method. The temperature dependence of thermodynamic and correlations functions are systematically studied for various Kondo couplings JK. The ground state value of the total local moment is presented as well. Finally, the phase diagrams of the finite clusters are constructed for periodic and open boundary conditions. For the two boundary conditions, two different regimes are found for small JK/t, depending on the distribution of non-interacting conduction electron states. If there are states within JK around the Fermi level, two energy scales, linear and quadratic in JK, exist. The former is associated with the onsite screening and the latter with the RKKY interaction. If there are no states within JK around the Fermi level, the only energy scale is that of the RKKY interaction. Our results imply that the form of the electron density of states (DOS) plays an important role in the competition between the Kondo screening and the RKKY interaction. The former is stronger if the DOS is larger around the Fermi level, while the latter is less sensitive to the form of the DOS.
description: 7 pages, 7 figures; corrected typos
Impact of EV Charging Stations in Power Grids in Italy and its Mitigation Mechanisms
Creators: name: Mogos, A. Samson
name: Grillo, Samuele
Publisher: name: arXiv
Year: 2021
Subjects: subject: Systems and Control (eess.SY)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Global warming leads the world to think of a different way of transportation: avoiding internal combustion engines and electrifying the transportation sector. With a high penetration of electric vehicle (EV) charging stations on an existing power distribution network, the impact may be consistent. The loads of the fast-charging stations would potentially result in increased peak load demand, reduced reserve margins, voltage instability, and reliability problems. The degrading performance of the power system due to the negative impact of the EV charging stations can even lead to penalties to be paid by the distribution system operator (DSO). This paper: i) investigates the impact of the \ac{ev} charging station on the distribution network for what concerns voltage drop on MV feeders and loading of transformers in primary substations, and ii) proposes a mitigation mechanism. A realistic typical Italian grid has been used to assess the impact of EV charging stations and to validate the mitigation mechanism.
FASMA: a python package for stellar parameters and chemical abundances
Creators: name: Tsantaki, Maria
name: Andreasen, Daniel
Publisher: name: Zenodo
Year: 2021
Subjects: Cool Stars on the main sequence

description: Effective temperature, surface gravity, and metallicity are basic stellar parameters necessary to characterize a star. Once these parameters are obtained, we can in turn, infer their chemical abundances of various elements and in conjunction with evolutionary models to estimate their evolution, i.e., mass and radius. In this work, we use spectroscopy as a powerful tool to extract this information from stellar atmospheres applied to stars with spectral type FGK both dwarfs and giants. FASMA is a Python package to derive the main stellar atmospheric parameters based on the spectral synthesis technique. FASMA is run via terminal by setting the user options in a configuration file. FASMA includes all the inputs for spectral synthesis along with a manual for the derivation of stellar parameters and chemical abundances. The user has to provide solely the stellar spectrum for the analysis.
description: {"references": ["Tsantaki et al. (2020)", "Tsantaki et al. (2018)"]}
Protokollbuch der Sitzungen der Aufsichtskommission, sowie der Generalversammlungen
Creators: name: Gustav Veillard & Cie., Bank-, Geldwechsel- und Effektengeschäft
Publisher: name: [s.n.]
Year: 1873

description: Deutsch
description: Verzeichnung=Description=Inventaire 2014 ISAD(G) / HAN Katalogisierungsregeln für Archivbestände Sebastian Preher
description: Digitalisierung=Digitization=Numérisation Dezember 2024 TIFF
Renormalization group flows for the second $Z_{N}$ parafermionic field theory for N odd
Creators: name: Dotsenko, Vladimir S.
name: Estienne, Benoit
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Using the renormalization group approach, the Coulomb gas and the coset techniques, the effect of slightly relevant perturbations is studied for the second parafermionic field theory with the symmetry $Z_{N}$, for N odd. New fixed points are found and classified.
Perceptually important points and dynamic time warping in time series prediction: Application to finance:
Creators: name: Τσινασλίδης, Πρόδρομος Ελευθερίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: Υπόθεση Αποτελεσματικότητας των Αγορών
Αντιληπτικά Σημαντικά Σημεία
Δυναμική Χρονική Στρέβλωση
Efficient Market Hypothesis
Perceptually Important Points
Dynamic Time Warping

description: An algorithmic method for assessing statistically the efficient market hypothesis (EMH) is developed based on two data mining tools; perceptually important points (PIPs) used to dynamically segment price series into subsequences, and dynamic time warping (DTW) used to find similar historical subsequences. Then predictions are made from the mappings of the most similar subsequences, and the prediction error statistic is used in the EMH assessment. The proposed prediction scheme is emerged in a manner that embeds basic conventions found in technical analysis. Thus it can be considered as indirect assessment of charting’s predictive performance. The predictions are assessed on simulated price paths composed of stochastic trend and chaotic deterministic time series, and real financial data of 18 world equity markets and the GBP/USD exchange rate. The main results establish that the proposed algorithm can capture the deterministic structure in simulated series, confirm the validity of EMH on the examined equity indices, and indicate that prediction of the exchange rates using PIPs and DTW could beat at cases the prediction of last available price.
description: Στην παρούσα εργασία εφαρμόζεται μία αλγοριθμική μέθοδος για την στατιστική αξιολόγηση της υπόθεσης της αποτελεσματικότητας των αγορών (ΥΑΑ). Η μέθοδος αυτή βασίζεται σε δύο εργαλεία από το γνωστικό αντικείμενο της εξόρυξης δεδομένων (data mining). Τα αντιληπτικά σημαντικά σημεία (Perceptually Important Points-PIPs) χρησιμοποιούνται για τον δυναμικό κατακερματισμό χρονοσειρών σε υπό-σειρές και η δυναμική χρονική στρέβλωση (Dynamic Time Warping-DTW) χρησιμοποιείται για να εντοπίσει όμοιες ιστορικές υπο-σειρές. Στη συνέχεια οι προβλέψεις γίνονται βάσει των πιο όμοιων υπο-σειρών, και χρησιμοποιούνται οι απαραίτητοι στατιστικοί δείκτες για την αξιολόγηση της προβλεπτικής ικανότητας και επομένως της ΥΑΑ. Η προτεινόμενη μεθοδολογία ενσωματώνει βασικές αρχές της τεχνικής ανάλυσης, και επομένως μπορεί να θεωρηθεί ως μία έμμεση αξιολόγηση της προβλεπτικής ικανότητας των σχηματισμών της τεχνικής ανάλυσης. Οι προβλέψεις γίνονται σε προσομοιωμένες χρονοσειρές αποτελούμενες από στοχαστική τάση και χαοτικές αιτιοκρατικές χρονοσειρές, και σε πραγματικές χρηματοοικονομικές χρονοσειρές (18 γνωστοί χρηματιστηριακοί δείκτες ανά τον κόσμο και συναλλαγματική ισοτιμία GBP/USD). Τα κύρια αποτελέσματα δείχνουν ότι ο προτεινόμενος αλγόριθμος περιγράφει την αιτιοκρατική δομή στις προσομοιωμένες χρονοσειρές, η μηδενική υπόθεση της ΥΑΑ δεν απορρίπτεται στους εξεταζόμενους χρηματιστηριακούς δείκτες και η πρόβλεψη στη συναλλαγματική ισοτιμία με τη χρήση PIPs και DTW είναι καλύτερη από τη πρόβλεψη βάσει της τελευταίας διαθέσιμης τιμής.
Universal size-dependent nonlinear charge transport in single crystals of the Mott insulator Ca$_2$RuO$_4$
Creators: name: Avallone, Guerino
name: Fermin, Remko
name: Lahabi, Kaveh
name: Granata, Veronica
name: Fittipaldi, Rosalba
name: Cirillo, Carla
name: Attanasio, Carmine
name: Vecchione, Antonio
name: Aarts, Jan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The surprisingly low current density required for inducing the insulator to metal transition has made Ca$_2$RuO$_4$ an attractive candidate material for developing Mott-based electronics devices. The mechanism driving the resistive switching, however, remains a controversial topic in the field of strongly correlated electron systems. Here we probe an uncovered region of phase space by studying high-purity Ca$_2$RuO$_4$ single crystals, using the sample size as principal tuning parameter. Upon reducing the crystal size, we find a four orders of magnitude increase in the current density required for driving Ca$_2$RuO$_4$ out of the insulating state into a non-equilibrium (also called metastable) phase which is the precursor to the fully metallic phase. By integrating a microscopic platinum thermometer and performing thermal simulations, we gain insight into the local temperature during simultaneous application of current and establish that the size dependence is not a result of Joule heating. The findings suggest an inhomogeneous current distribution in the nominally homogeneous crystal. Our study calls for a reexamination of the interplay between sample size, charge current, and temperature in driving Ca$_2$RuO$_4$ towards the Mott insulator to metal transition.
Zirkulare
Creators: name: Gustav Veillard & Cie., Bank-, Geldwechsel- und Effektengeschäft
Publisher: name: [s.n.]
Year: 1873

description: Deutsch, Französisch
description: Verzeichnung=Description=Inventaire 2014 ISAD(G) / HAN Katalogisierungsregeln für Archivbestände Sebastian Preher
description: Digitalisierung=Digitization=Numérisation Dezember 2024 TIFF
Charm Production at Large Rapidities in p+p and d+Au Collisions at PHENIX at RHIC
Creators: name: Wang, Xiaorong
Publisher: name: arXiv
Year: 2006
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: We study charm production through dimuon and single muon measurements at forward and backward rapidities in p+p and d+Au collisions with the PHENIX muon detectors. We also compare open charm to $J/ψ$ yields in the forward and backward rapidities in d+Au collisions and study the origin of the large forward and backward asymmetry in open charm production observed by the PHENIX experiment.
description: 4 pages, 3 figures, DIS2006 conference, April 2006, Tsukuba, Japan
Statuten
Creators: name: Gustav Veillard & Cie., Bank-, Geldwechsel- und Effektengeschäft
Publisher: name: [s.n.]
Year: 1873

description: Deutsch
description: Verzeichnung=Description=Inventaire 2014 ISAD(G) / HAN Katalogisierungsregeln für Archivbestände Sebastian Preher
description: Digitalisierung=Digitization=Numérisation Dezember 2024 TIFF
NGC 6709: A Faint Zero-Age Main Sequence Open Cluster
Creators: name: Cole-Kodikara, Elizabeth M
name: Barnes, Sydney
name: Weingrill, Jörg
name: Fritzewski, Dario
name: Gruner, David
Publisher: name: Zenodo
Year: 2021
Subjects: Stellar systems, clusters, and associations
Cool Stars on the main sequence
Young stars

description: Gyrochronology is the study of stellar spin down with respect to age. Open clusters contain mostly homogenous stars and thus are ideal to calibrate the dependence of rotation rates on stellar mass and age. We select for this study NGC 6709, a young open cluster (∼ 150 Myr) with at least one red giant member that is similar in age to the Pleiades. We take a series of observations from May 2015 to June 2018 with the AIP’s STELLar Activity 1.2m telescope (STELLA1) and apply the point spread function to construct individual time series for 305 cluster members in our field. We search for periods within the time series utilizing four data analysis techniques: the phase dispersion minimization method, the string length method, the generalized Lomb-Scargle method, and the CLEAN method. Of the 305 cluster member stars, periods are recovered for the photometric light curves of 60 stars. We plot the Gaia colors of these stars against their periods to obtain a color-period diagram (CPD). The CPD has two main features: a sequence of slow rotators that fall along a diagonal where period increases with redder stars, and a less populated clump of rapidly rotating cool stars. The area between these two regimes is sparsely populated. We compare the results to several gyrochronology models of stellar spin down by using isochrones. The bifurcation of rotation periods is explained by the transition of stars between rapid and slow rotation as they spin down over time. The CPD of NGC 6709 is similar to those of clusters with ages around 110–160 Myrs, such as the Pleiades and NGC 2516, demonstrating consistency in stellar rotation, activity, and age across different clusters.
description: {"references": ["Amard, L., Palacios, A., Charbonnel, C., et al. 2019, , 631, A77", "Cantat-Gaudin, T., Jordi, C., Vallenari, A., et al. 2018, , 618, A93", "Fritzewski, D. J., Barnes, S. A., James, D. J., & Strassmeier, K. G. 2020, , 641, A51", "Gaia Collaboration, Brown, A. G. A., Vallenari, A., et al. 2020, arXiv e-prints, arXiv:2012.01533", "Stetson, P. B. 1987, , 99, 191"]}
Μοντελοποίηση πιστωτικά επισφαλών παραγώγων με τη χρήση διαδικασιών Cox:
Creators: name: Αντωνίου, Μαρίνα Αντωνίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: πιστωτικά επισφαλή παράγωγα
πιστωτικός κίνδυνος
διαδικασίες Cox
πιστοληπτικές ικανότητες defaultable derivatives
credit risk
Cox processes
credit ratings

description: Σκοπός της παρούσας διπλωματικής εργασίας είναι η περιγραφή και η μελέτη του πλαισίου που παρουσίασε ο Lando (1998) για τη μοντελοποίηση των πιστωτικά επισφαλών παραγώγων. Το συγκεκριμένο πλαίσιο ανάγει τα τεχνικά ζητήματα της μοντελοποίησης του πιστωτικού κινδύνου, στα ίδια ζητήματα που ανακύπτουν κατά τη μοντελοποίηση μιας συνήθους ακολουθίας επιτοκίων. Αρχικά παρουσιάζονται κάποιες βασικές έννοιες στα Στοχαστικά Χρηματοοικονομικά, αλλά και το απαραίτητο μαθηματικό υπόβαθρο για τις επόμενες ενότητες. Στο δεύτερο κεφάλαιο γίνεται μια εισαγωγή στον πιστωτικό κίνδυνο, ενώ στο τρίτο κεφάλαιο παραθέτονται χρήσιμες γνώσεις για τις διαδικασίες Cox και σκιαγραφείται η κατασκευή τους. Το τέταρτο κεφάλαιο, το οποίο είναι και το κύριο μέρος της διπλωματικής αυτής, αποτελεί την ανάλυση της εργασίας του Lando (1998). Στο κεφάλαιο αυτό, παρουσιάζεται πώς μπορεί να γενικευτεί το Μαρκοβιανό μοντέλο που προτάθηκε από τους Jarrow, Lando & Turnbull (1997), έτσι ώστε να περιλαμβάνει στοχαστικές τάσεις μετάβασης μεταξύ των πιστοληπτικών ικανοτήτων. Τέλος, εμπεριέχονται εφαρμογές της συγκεκριμένης μεθοδολογίας, όπως είναι η τιμολόγηση των παραγώγων, αλλά κι ένα ενδεικτικό μοντέλο του Vasicek, το οποίο προσαρμόζει τα spot spreads και τις ευαισθησίες τους, στις μεταβολές του στιγμιαίου επιτοκίου.
description: The goal of this Master Thesis is the description and study of the framework presented in Lando (1998) for modeling defaultable securities. This framework reduces the technical issues of modeling credit risk to the same issues faced when modeling the ordinary term structure of interest rates. First, some basic notions in Stochastic Finance are presented, as well as the necessary mathematical background for the following sections. Chapter 2 provides an introduction to credit risk, while chapter 3 contains useful knowledge about Cox processes and an outline of their construction. Chapter 4 is the main part of this Master Thesis and it forms the analysis of the paper of Lando (1998). In this chapter it is shown how a Markovian model proposed by Jarrow, Lando & Turnbull (1997) may be generalized to include stochastic transition rates between credit ratings. Finally, applications of the methodology are incorporated, such as bond pricing and also an illustrative Vasicek model which fits the spot spreads and their sensitivities to changes in the short rate.
JWST/NIRSpec observations of nearby young clusters
Creators: name: Oliveira, Catarina Alves De
Publisher: name: Zenodo
Year: 2021
Subjects: Young stars
Very low mass stars

description: A poster for the Cool Stars 20.5 Virtual Conference. Abstract: This should be the last Cool Stars before JWST launches in 2021. As we patiently await the real data, I will showcase how I plan to use ESA’s contributed NIRSpec instrument in the quest to further understand star formation in our Galaxy.
Constant-rate inflation: primordial black holes from conformal weight transitions
Creators: name: Ng, Kin-Wang
name: Wu, Yi-Peng
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Constant-rate inflation, including ultra-slow-roll as a special case, has been widely applied to the formation of primordial black holes with significant deviation from the standard slow-roll conditions at both the growing and decaying phases of the power spectrum. We derive analytic solutions for the curvature perturbations with respect to the late-time scaling dimensions (conformal weights) constrained by the dilatation symmetry of the de Sitter background and show that the continuity of conformal weights across different rolling phases is protected by the adiabatic condition of the inflaton perturbation. The temporal excitation of subleading states (with the next-to-lowest conformal weights), recorded as the "steepest growth" of the power spectrum, is triggered by the entropy production in the transition from slow-roll to constant-rate phases.
description: 18 + 4 pages, 6 figures; v2: references added, provided entropy production as a criterion for the steepest growth; v3: minor corrections, version matched with publication
Amtliche Urkunden betreffend Konstituierung der Gesellschaft
Creators: name: Gustav Veillard & Cie., Bank-, Geldwechsel- und Effektengeschäft
Publisher: name: [s.n.]
Year: 1873

description: Enthält: Zusammengeheftete Urkunden von 1873 und 1878 sowie Statuten von 1873
description: Deutsch
description: Verzeichnung=Description=Inventaire 2014 ISAD(G) / HAN Katalogisierungsregeln für Archivbestände Sebastian Preher
description: Digitalisierung=Digitization=Numérisation Dezember 2024 TIFF
Towards Understanding the Mass-Metallicity relation of Quasar Absorbers: Evidence for bimodality and consequences
Creators: name: Bouche, Nicolas
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: One way to characterize and understand HI-selected galaxies is to study their metallicity properties. In particular, we show that the metallicity of absorbers is a bivariate function of the HI column density (NHI) and the MgII equivalent width (Wr(2796)). Thus, a selection upon Wr(2796) is not equivalent to a HI selection for intervening absorbers. A direct consequence for damped absorbers with NHI>20.3 from the bivariate metallicity distribution is that any correlation between the metallicity [X/H] and velocity width (or Wr(2796)) arises from the HI cut and therefore can not be interpreted as a signature of the mass-metallicity relation akin to normal field galaxies. Thus DLA samples are intrinsically heterogeneous. On the other hand, a sample of MgII-selected absorbers, which are statistically dominated by lowest NHI systems (sub-DLAs), are found to have a more uniform metallicity distribution. We postulate that the bivariate metallicity distribution can be explained by two different physical origins of absorbers, namely sight-lines through the ISM of small galaxies and sight-lines through out-flowing material. Several published results follow from this bivariate [X/H] distribution such as (a) the two classes of DLAs, reported by Wolfe et al., and (b) the constant dust-to-gas ratio for MgII-absorbers.
description: 6 pages, 4 figures, accepted for publication in MNRAS
The dipper population of Taurus seen with K2
Creators: name: Roggero, N.
name: Bouvier, J.
name: Rebull, L.M.
name: Cody, A.M.
Publisher: name: Zenodo
Year: 2021
Subjects: Young stars
Accretion onto T Tauri Stars

description: During the evolution of T Tauri stars and the formation of their planetary systems, accretion processes play a key role. However, the more complex interaction at the rim of the inner region of the disk is still not well understood. Some young stars exhibit recurrent, quite irregular flux dips in their photometry (dippers). These can be explained as extinction events by dusty material from the protoplanetary disk, which is accreted onto the star. In the magnetospheric accretion scenario, the magnetic field of a young star truncates the disk where the magnetic field pressure is equal to the ram pressure of the accreting material. If the temperature close to this distance is low enough to avoid dust sublimation, dust might be lifted above the disk plane and obscure the star. The dataset for this study consists of K2 light curves of the Taurus region, that was observed continuously for $\sim$80 days. The periodicity of the eclipses delivers hints about a stable or unstable accretion regime. The stars classified as dippers have spectral types K4-M6, consistent with studies in other regions, and the mass range goes down to the brown dwarf limit. The co-rotation radii can be derived to a few stellar radii, with temperatures at co-rotation < 1600 K, that indicates that in most cases dust could survive at co-rotation. The range of derived inclinations suggests that, for some dippers, other phenomena than magnetospheric accretion might cause eclipses. We find that the angular extension of the dusty structure producing the dips correlates with the stellar period.
description: {"references": ["Cody, A. M., Stauffer, J., Baglin, A., et al. 2014, AJ, 147, 82", "Bodman, E. H. L., Quillen, A. C., Ansdell, M., et al. 2017, MNRAS, 470, 202", "Pecaut, M. J. & Mamajek, E. E. 2013, ApJS, 208, 9", "Baraffe, I., Homeier, D., Allard, F., & Chabrier, G. 2015, A&A, 577, A42", "Roggero, N., Bouvier, J., Rebull, L.M., Cody, A.M. (submitted to A&A)"]}
An Overview of Agent-based Traffic Simulators
Creators: name: Nguyen, Johannes
name: Powers, Simon T.
name: Urquhart, Neil
name: Farrenkopf, Thomas
name: Guckert, Michael
Publisher: name: arXiv
Year: 2021
Subjects: subject: Multiagent Systems (cs.MA)
subject: Computer Science and Game Theory (cs.GT)
subject: FOS: Computer and information sciences

description: Individual traffic significantly contributes to climate change and environmental degradation. Therefore, innovation in sustainable mobility is gaining importance as it helps to reduce environmental pollution. However, effects of new ideas in mobility are difficult to estimate in advance and strongly depend on the individual traffic participants. The application of agent technology is particularly promising as it focuses on modelling heterogeneous individual preferences and behaviours. In this paper, we show how agent-based models are particularly suitable to address three pressing research topics in mobility: 1. Social dilemmas in resource utilisation; 2. Digital connectivity; and 3. New forms of mobility. We then explain how the features of several agent-based simulators are suitable for addressing these topics. We assess the capability of simulators to model individual travel behaviour, discussing implemented features and identifying gaps in functionality that we consider important.
description: The final publication is available at Elsevier Transportation Research Interdisciplinary Perspectives via https://doi.org/10.1016/j.trip.2021.100486
Towards a large dataset of protein-protein and protein-ligand interactions for Deep Learning
Creators: name: Ferrante, Hans De
name: Haydarlou, Reza
name: Heringa, Jaap
name: K. Anton Feenstra
Publisher: name: F1000 Research Limited
Year: 2019

description: Review of ideas behind competing sSEQ-to-RES tools to find new features. Applied Zhang & Kurgan’s methodology to entire PDB towards a large labeled dataset fit for deep learning. Improvement from eitherXGBoost, iRF or elastic net regression compared to SeRenDIP, on par with best sSEQ-to-RES tools. For decision-tree based learners, driven by RSA and ASA, for elastic net by PSSM. Different classifiers somewhat orthogonal; window-based predictions may be further improved by ensembling. But whole-sequence based deep learning more promising.
AMLVaran: Improvements in user-friendlyness of a human NGS variant assessment system
Creators: name: Wünsch, Christian
name: Dugas, Martin
Publisher: name: F1000 Research Limited
Year: 2019

description: Introduction
Next-generation Sequencing (NGS) allows for sequencing large genetic regions at low cost and is increasingly used in routine clinical diagnostics. The raw sequencing output has to undergo a complex bioinformatics analysis process.
AMLVaran is a web-based platform that performs the complete data processing workflow for targeted NGS samples and presents the detected variants in form of an interactive website. It generates clinical reports as well, which are adapted to the needs of Acute Myeloid Leukemia (AML) diagnostics.
Usability is a key factor of AMLVaran, since it is aimed to be operated primarily by medical staff. A user study with a first prototype of the software showed that users without a specific training (n=9) had problems with the operation of some features. In several cases, results were misinterpreted because of this.

Results
In a follow-up study with the final software (with a different user group and new tasks), 5/6 hotspot mutations were correctly interpreted by all testers (n=12). In addition, the testers were able to perform more complex tasks with greater accuracy. It is noticeable, that the perceived difficulty of tasks has greatly decreased in the final version. And the users felt more confident operating the final software than with the prototype.
The perceived user-friendliness of the software, evaluated with a standardized SUS questionnaire, increased from a median score of 68 to 80.
The optimized version was rated with "good" or better by 62% and with “excellent” by 33% of the testers.
Only one single user rated it with “poor”.

Discussion
AMLVaran was clearly improved by the presented measures. Not only the user satisfaction was increased, but also the precision of their interpretation of the software’s output.
The results demonstrate the benefit of usability studies and show that a good user interface can contribute decisively to the success or failure of a software tool.
Unfortunately, many projects end after the completion of software development and basic technical validation.
We want to encourage developers to put more emphasis on software usability.
Multiscaling in the sequence of areas enclosed by coalescing random walkers
Creators: name: Welinder, Peter
name: Pruessner, Gunnar
name: Christensen, Kim
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We address the question whether the sequence of areas between coalescing random walkers displays multiscaling and in the process calculate the second moment as well as the two point correlation function exactly. The scaling of higher order correlation functions is estimated numerically, indicating a logarithmic dependence on the system size. Together with the analytical results, this confirms the presence of multiscaling.
description: 19 pages, 8 figures, IOP style
Ariel, The Atmospheric remote-sensing infrared exoplanet large-survey: Host stars affecting the Atmospheres of their Planets
Creators: name: Lueftinger, Theresa
name: Tinetti, Giovanna
name: Salvignol, Jean-Christophe
name: Eccleston, Paul
Publisher: name: Zenodo
Year: 2021
Subjects: Space Mission, Exoplanets, Stars, Activity,

description: The recently adopted Ariel mission, the atmospheric remote-sensing infrared exoplanet large-survey, is the M4 mission within the Cosmic Vision science programme of ESA. The top level science objective of Ariel is to take the study of exoplanets to the next level by providing direct independent information of (bulk) chemical composition of a statistically large and diverse sample of known exoplanets (≥ 500) covering a wide range of masses, densities, equilibrium temperatures, orbital properties and host-star characteristics. It is the first mission dedicated to measuring the chemical composition and thermal structures of hundreds of transiting exoplanets, surveying simultaneously in visible and infrared wavelengths and enabling planetary science far beyond the boundaries of the Solar System. In this poster we focus on discussing the influence of Ariel host stars on the atmospheres of their planets.
Unveiling the power spectra of δ Sct stars with TESS. The temperature, gravity, and frequency scaling relation
Creators: name: S. Barceló Forteza
name: A. Moya
name: D. Barrado
name: E. Solano
name: S. Martín-Ruiz
name: J.C. Suárez
name: A. García Hernández
Publisher: name: Zenodo
Year: 2021
Subjects: asteroseismology
stars: oscillations
stars: variables: δ Scuti

description: Thanks to long-duration high-cadence light curves from TESS, we suggest the frequency at maximum power as a proper indicative of the mean temperature and surface gravity for delta Scuti stars. This seismic index do not depend on rotation or inclination unlike photometric and spectroscopic techniques that may be significantly affected by gravity-darkening effect or extinction. Thus, it is posible to improve their distance, age, and habitable zone measurements for this kind of stars.
Towards a better list of citation superstars: compiling a multidisciplinary list of highly cited researchers
Creators: name: Podlubny, Igor
name: Kassayova, Katarina
Publisher: name: arXiv
Year: 2006
Subjects: subject: Statistics Theory (math.ST)
subject: General Literature (cs.GL)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences
subject: 00A99

description: A new approach to producing multidisciplinary lists of highly cited researchers is described and used for compiling a multidisciplinary list of highly cited researchers. This approach is essentially related to the recently discovered law of the constant ratios (Podlubny, 2004) and gives a better-balanced representation of different scientific fields.
description: 15 pages, 4 tables
Steady-state joint distribution for first-order stochastic reaction kinetics
Creators: name: Li, Youming
name: Jiang, Da-Quan
name: Jia, Chen
Publisher: name: arXiv
Year: 2021
Subjects: subject: Molecular Networks (q-bio.MN)
subject: FOS: Biological sciences

description: While the analytical solution for the marginal distribution of a stochastic chemical reaction network has been extensively studied, its joint distribution, i.e. the solution of a high-dimensional chemical master equation, has received much less attention. Here we develop a novel method of computing the exact joint distributions of a wide class of first-order stochastic reaction systems in steady-state conditions. The effectiveness of our method is validated by applying it to four gene expression models of biological significance, including models with 2A peptides, nascent mRNA, gene regulation, translational bursting, and alternative splicing.
description: 33 pages, 6 figures
EDITH :ECG biometrics aided by Deep learning for reliable Individual auTHentication
Creators: name: Ibtehaz, Nabil
name: Chowdhury, Muhammad E. H.
name: Khandakar, Amith
name: Kiranyaz, Serkan
name: Rahman, M. Sohel
name: Tahir, Anas
name: Qiblawey, Yazan
name: Rahman, Tawsifur
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: Artificial Intelligence (cs.AI)
subject: Cryptography and Security (cs.CR)
subject: FOS: Computer and information sciences

description: In recent years, physiological signal based authentication has shown great promises,for its inherent robustness against forgery. Electrocardiogram (ECG) signal, being the most widely studied biosignal, has also received the highest level of attention in this regard. It has been proven with numerous studies that by analyzing ECG signals from different persons, it is possible to identify them, with acceptable accuracy. In this work, we present, EDITH, a deep learning-based framework for ECG biometrics authentication system. Moreover, we hypothesize and demonstrate that Siamese architectures can be used over typical distance metrics for improved performance. We have evaluated EDITH using 4 commonly used datasets and outperformed the prior works using less number of beats. EDITH performs competitively using just a single heartbeat (96-99.75% accuracy) and can be further enhanced by fusing multiple beats (100% accuracy from 3 to 6 beats). Furthermore, the proposed Siamese architecture manages to reduce the identity verification Equal Error Rate (EER) to 1.29%. A limited case study of EDITH with real-world experimental data also suggests its potential as a practical authentication system.
description: Preprint
Rotationally Modulated X-ray Emission from T Tauri Stars
Creators: name: Gregory, S. G.
name: Jardine, M.
name: Cameron, A. Collier
name: Donati, J. -F.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have modelled the rotational modulation of X-ray emission from T Tauri stars assuming that they have isothermal, magnetically confined coronae. By extrapolating surface magnetograms we find that T Tauri coronae are compact and clumpy, such that rotational modulation arises from X-ray emitting regions being eclipsed as the star rotates. Emitting regions are close to the stellar surface and inhomogeneously distributed about the star. However some regions of the stellar surface, which contain wind bearing open field lines, are dark in X-rays. From simulated X-ray light curves, obtained using stellar parameters from the Chandra Orion Ultradeep Project, we calculate X-ray periods and make comparisons with optically determined rotation periods. We find that X-ray periods are typically equal to, or are half of, the optical periods. Further, we find that X-ray periods are dependent upon the stellar inclination, but that the ratio of X-ray to optical period is independent of stellar mass and radius.
description: 10 pages, 8 figures, accepted for publication in MNRAS
Characterization of starfish yolk and cortical granule proteins, and of a novel extracellular proteoglycan implicated in digestive tract morphogenesis
Creators: name: Reimer, Corinne L.
Publisher: name: University of British Columbia
Year: 2009

description: Extracellular matrix (ECM) is thought to play a major role in morphogenesis by influencing processes such as cell migration and differentiation, although the specific mechanisms involved are poorly understood. This study examined the ECM and egg storage granules of starfish (Pisaster ochraceus) embryos, and attempted to identity components important for digestive tract morphogenesis. Three monoclonal antibodies were developed with specificities for the ECM, yolk and cortical granules in Pisaster eggs and embryos. These antibodies were then used to localize, isolate and characterize the antigens through early development, using immunohistochemistry, immunocytochemistry, immunochemical and biochemical techniques. The first antibody, PM1, binds to a large extracellular proteoglycan, which appears in the blastocoel matrix at mid-gastrulation, and is synthesized only by endodermally-derived tissues. The use of PM1 antibody as a function blocking agent in live embryo cultures suggested that it plays an important role in digestive tract morphogenesis. A second antibody recognizes a protein localized in cortical granules of unfertilized eggs. The majority of these granules are located in the peripheral egg cytoplasm and are released at fertilization. However, a second morphologically identical population of granules remain dispersed throughout the egg cytoplasm, and appear to contribute to ECMs of the developing embryo, including the blastocoel ECM, basement membranes, and the hyaline layer. The function of this protein is currently unknown; however, it has a different storage and secretion profile from the PM1 proteoglycan, suggesting its role in the blastocoel matrix may be different. A third antibody recognizes proteins stored in yolk granules located throughout the egg and cells of the developing embryo, which do not appear to contribute to ECMs during embryogenesis. Partial biochemical characterizations using the anti-yolk antibody revealed that there are several molecular species of yolk proteins present in the oocyte, and that their molecular composition changes during embryogenesis. Depletion of the yolk proteins is not significant until the larval stage, suggesting that they do not play a major role until later in development.
Heavy Flavor Production at PHENIX at RHIC
Creators: name: Wang, Xiaorong
Publisher: name: arXiv
Year: 2006
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: A study of heavy flavor production in different collision systems in various kinematic regions presents an opportunity to probe cold nuclear medium and hot dense matter effects. Results from the PHENIX experiment on $J/ψ$ and open charm production in Au+Au and Cu+Cu collisions at $\sqrt{s_{NN}}$ =200 GeV are presented. The data show strong $J/ψ$ suppression in central AA collisions, similar to NA50 results, and strong suppression in high $p_T$ open charm production. The $J/ψ$ production in Au+Au and d+Au collisions is compared to understand the cold nuclear medium effects. The data show significant cold nuclear effects in charm production in d+Au collisions at forward and backward rapidity ranges.
description: 4 pages, 3figures, CIPANP2006, May 29-June 3, 2006. San Juan, PuertoRico
Algebras of operators in Banach spaces over the quaternion skew field and the octonion algebras
Creators: name: Ludkovsky, S. V.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Operator Algebras (math.OA)
subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 47L30

description: The article is devoted to quasilinear operators in spaces over quaternions and octonions. Spectral theory of bounded and unbounded operators is investigated. Analogs of C^* algebras are defined and studied. Among main results are analogs of the Gelfand-Mazur, Stone, Gelfand-Naimark-Segal, von Neumann, Kaplansky, etc. theorems, but here over the skew field of quaternions and the octonion algebra.
description: 59 pages, 16 references
Ideal Stars and General Relativity
Creators: name: Fronsdal, Christian
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We study a system of differential equations that governs the distribution of matter in the theory of General Relativity. The new element in this paper is the use of a dynamical action principle that includes all the degrees of freedom, matter as well as metric. The matter lagrangian defines a relativistic version of non-viscous, isentropic hydrodynamics. The matter fields are a scalar density and a velocity potential; the conventional, four-vector velocity field is replaced by the gradient of the potential and its scale is fixed by one of the eulerian equations of motion, an innovation that significantly affects the imposition of boundary conditions. If the density is integrable at infinity, then the metric approaches the Schwarzschild metric at large distances. There are stars without boundary and with finite total mass; the metric shows rapid variation in the neighbourhood of the Schwarzschild radius and there is a very small core where a singularity indicates that the gas laws break down. For stars with boundary there emerges a new, critical relation between the radius and the gravitational mass, a consequence of the stronger boundary conditions. Tentative applications are suggested, to certain Red Giants, and to neutron stars, but the investigation reported here was limited to polytropic equations of state. Comparison with the results of Oppenheimer and Volkoff on neutron cores shows a close agreement of numerical results. However, in the model the boundary of the star is fixed uniquely by the required matching of the interior metric to the external Schwarzschild metric, which is not the case in the traditional approach.
description: 26 pages, 7 figures
On the signal-to-interference ratio of CDMA systems in wireless communications
Creators: name: Bai, Z. D.
name: Silverstein, Jack W.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 15A52, 60F15 (Primary) 60G35, 94A05, 94A15 (Secondary)

description: Let $\{s_{ij}:i,j=1,2,...\}$ consist of i.i.d. random variables in $\mathbb{C}$ with $\mathsf{E}s_{11}=0$, $\mathsf{E}|s_{11}|^2=1$. For each positive integer $N$, let $\mathbf{s}_k={\mathbf{s}}_k(N)=(s_{1k},s_{2k},...,s_{Nk})^T$, $1\leq k\leq K$, with $K=K(N)$ and $K/N\to c>0$ as $N\to\infty$. Assume for fixed positive integer $L$, for each $N$ and $k\leq K$, ${\boldsα}_k=(α_k(1),...,α_k(L))^T$ is random, independent of the $s_{ij}$, and the empirical distribution of $(α_1,...,α_K)$, with probability one converging weakly to a probability distribution $H$ on $\mathbb{C}^L$. Let ${\boldsβ}_k={\boldsβ}_k(N)=(α_k(1)\mathbf{s}_k^T,...,α_k(L)\m athbf{s}_k^T)^T$ and set $C=C(N)=(1/N)\sum_{k=2}^K{\bolds β}_k{\bolds β}_k^*$. Let $σ^2>0$ be arbitrary. Then define $SIR_1=(1/N){\boldsβ}^*_1(C+σ^2I)^{-1}{\boldsβ}_1$, which represents the best signal-to-interference ratio for user 1 with respect to the other $K-1$ users in a direct-sequence code-division multiple-access system in wireless communications. In this paper it is proven that, with probability 1, $SIR_1$ tends, as $N\to\infty$, to the limit $\sum_{\ell,\ell'=1}^L\barα_1(\ell) alpha_1(\ell')a_{\ell,\ell'},$ where $A=(a_{\ell,\ell'})$ is nonrandom, Hermitian positive definite, and is the unique matrix of such type satisfying $A=\bigl(c \mathsf{E}\frac{{\boldsα}{\bolds α}^*}{1+{\boldsα}^*A{\boldsα}}+σ^2I_L\bigr)^{-1}$, where ${\boldsα}\in \mathbb{C}^L$ has distribution $H$. The result generalizes those previously derived under more restricted assumptions.
description: Published at http://dx.doi.org/10.1214/105051606000000637 in the Annals of Applied Probability (http://www.imstat.org/aap/) by the Institute of Mathematical Statistics (http://www.imstat.org)