cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
ASASSN-18aan: An Eclipsing SU UMa-type Cataclysmic Variable with a 3.6-hour Orbital Period and a Late G-type Secondary Star
Creators: name: Wakamatsu, Yasuyuki
name: Thorstensen, John R.
name: Kojiguchi, Naoto
name: Isogai, Keisuke
name: Kimura, Mariko
name: Ohnishi, Ryuhei
name: Kato, Taichi
name: Itoh, Hiroshi
name: Sugiura, Yuki
name: Sumiya, Sho
name: Matsumoto, Hanami
name: Ito, Daiki
name: Nikai, Kengo
name: Akitaya, Hiroshi
name: Ishioka, Chihiro
name: Oide, Kohei
name: Kanai, Takahiro
name: Uzawa, Yoshinori
name: Oasa, Yumiko
name: Tordai, Tamás
name: Vanmunster, Tonny
name: Shugarov, Sergey Yu.
name: Yamanaka, Masayuki
name: Sasada, Mahito
name: Takagi, Kengo
name: Nishinaka, Yuki
name: Yamazaki, Yuina
name: Otsubo, Ikki
name: Nakaoka, Tatsuya
name: Murata, Katsuhiro L.
name: Ohsawa, Ryou
name: Morita, Masahiro
name: Ichiki, Makoto
name: Dufoer, Sjoerd
name: Mizutani, Masanori
name: Horiuchi, Takashi
name: Tozuka, Miyako
name: Takayama, Masaki
name: Ohshima, Tomohito
name: Saito, Tomoki
name: Dubovsky, Pavol A.
name: Stone, Geoff
name: Miller, Ian
name: Nogami, Daisaku
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We report photometric and spectroscopic observations of the eclipsing SU UMa-type dwarf nova ASASSN-18aan. We observed the 2018 superoutburst with 2.3 mag brightening and found the orbital period ($P_{\rm orb}$) to be 0.149454(3) d, or 3.59 hr. This is longward of the period gap, establishing ASASSN-18aan as one of a small number of long-$P_{\rm orb}$ SU UMa-type dwarf novae. The estimated mass ratio, ($q=M_2/M_1 = 0.278(1)$), is almost identical to the upper limit of tidal instability by the 3:1 resonance. From eclipses, we found that the accretion disk at the onset of the superoutburst may reach the 3:1 resonance radius, suggesting that the superoutburst of ASASSN-18aan results from the tidal instability. Considering the case of long-$P_{\rm orb}$ WZ Sge-type dwarf novae, we suggest that the tidal dissipation at the tidal truncation radius is enough to induce SU UMa-like behavior in relatively high-$q$ systems such as SU UMa-type dwarf novae, but that this is no longer effective in low-$q$ systems such as WZ Sge-type dwarf novae. The unusual nature of the system extends to the secondary star, for which we find a spectral type of G9, much earlier than typical for the orbital period, and a secondary mass $M_2$ of around 0.18 M$_{\odot}$, smaller than expected for the orbital period and the secondary's spectral type. We also see indications of enhanced sodium abundance in the secondary's spectrum. Anomalously hot secondaries are seen in a modest number of other CVs and related objects. These systems evidently underwent significant nuclear evolution before the onset of mass transfer. In the case of ASASSN-18aan, this apparently resulted in a mass ratio lower than typically found at the system's $P_{\rm orb}$, which may account for the occurrence of a superoutburst at this relatively long period.
description: 17 pages, 14 figures, accepted for publication in PASJ
Understanding the Representation and Representativeness of Age in AI Data Sets
Creators: name: Park, Joon Sung
name: Bernstein, Michael S.
name: Brewer, Robin N.
name: Kamar, Ece
name: Morris, Meredith Ringel
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computers and Society (cs.CY)
subject: Human-Computer Interaction (cs.HC)
subject: FOS: Computer and information sciences

description: A diverse representation of different demographic groups in AI training data sets is important in ensuring that the models will work for a large range of users. To this end, recent efforts in AI fairness and inclusion have advocated for creating AI data sets that are well-balanced across race, gender, socioeconomic status, and disability status. In this paper, we contribute to this line of work by focusing on the representation of age by asking whether older adults are represented proportionally to the population at large in AI data sets. We examine publicly-available information about 92 face data sets to understand how they codify age as a case study to investigate how the subjects' ages are recorded and whether older generations are represented. We find that older adults are very under-represented; five data sets in the study that explicitly documented the closed age intervals of their subjects included older adults (defined as older than 65 years), while only one included oldest-old adults (defined as older than 85 years). Additionally, we find that only 24 of the data sets include any age-related information in their documentation or metadata, and that there is no consistent method followed across these data sets to collect and record the subjects' ages. We recognize the unique difficulties in creating representative data sets in terms of age, but raise it as an important dimension that researchers and engineers interested in inclusive AI should consider.
description: 9 pages
On-disk solar coronal condensations facilitated by magnetic reconnection between open and closed magnetic structures
Creators: name: Li, Leping
name: Peter, Hardi
name: Chitta, Lakshmi Pradeep
name: Song, Hongqiang
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Coronal condensation and rain are a crucial part of the mass cycle between the corona and chromosphere. In some cases, condensation and subsequent rain originate in the magnetic dips formed during magnetic reconnection. This provides a new and alternative formation mechanism for coronal rain. Until now, only off-limb, rather than on-disk, condensation events during reconnection have been reported. In this paper, employing extreme-ultraviolet (EUV) images of the Solar Terrestrial Relations Observatory (STEREO) and Solar Dynamics Observatory (SDO), we investigate the condensations facilitated by reconnection from 2011 July 14 to 15, when STEREO was in quadrature with respect to the Sun-Earth line. Above the limb, in STEREO/EUV Imager (EUVI) 171 Å~images, higher-lying open structures move downward, reconnect with the lower-lying closed loops, and form dips. Two sets of newly reconnected structures then form. In the dips, bright condensations occur in EUVI 304 Å~images repeatedly which then flow downward to the surface. In the on-disk observations by SDO/Atmospheric Imaging Assembly (AIA) in the 171 Å~channel, these magnetic structures are difficult to identify. Dark condensations appear in AIA 304 Å~images, and then move to the surface as on-disk coronal rain. The cooling and condensation of coronal plasma is revealed by the EUV light curves. If only the on-disk observations would be available, the relation between the condensations and reconnection, shown clearly by the off-limb observations, would not be identified. Thus, we suggest that some on-disk condensation events seen in transition region and chromospheric lines may be facilitated by reconnection.
description: 17 pages, 2 tables, 8 figures, accepted for publication in ApJ
Electrical tuning of the spin-orbit interaction in nanowire by transparent ZnO gate grown by atomic layer deposition
Creators: name: Takase, Keiko
name: Tateno, Kouta
name: Sasaki, Satoshi
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: We develop an InAs nanowire gate-all-around field-effect transistor using a transparent conductive zinc oxide (ZnO) gate electrode, which is in-situ atomic layer deposited after growth of gate insulator of Al2O3. We perform magneto-transport measurements and find a crossover from weak localization to weak antilocalization effect with increasing gate voltage, which demonstrates that the Rashba spin-orbit coupling is tuned by the gate electrode. The efficiency of the gate tuning of the spin-orbit interaction is higher than those obtained for two-dimensional electron gas, and as high as that for a gate-all-around nanowire metal-oxide-semiconductor field-effect transistor that was previously reported. The spin-orbit interaction is discussed in line with not only conventionally used one-dimensional model but also recently proposed model that considers effects of microscopic band structures of materials.
description: 14 pages, 4 figures
Αρχαιολογικές αφηγήσεις και εκπαίδευση: ανάλυση περιεχομένου και εικονογραφήσεις στα σχολικά εγχειρίδια του Δημοτικού
Creators: name: Κασβίκης, Κώστας Π.
Publisher: name: Aristotle University of Thessaloniki
Year: 2004
Subjects: Σχολικά εγχειρίδια
School textbooks

description: Θέμα της διατριβής αποτέλεσε ο εντοπισμός, η ανάλυση και η ερμηνεία των αρχαιολογικών αφηγήσεων στα εν χρήσει σχολικά εγχειρίδια του Δημοτικού Σχολείου(Γλώσσα, Ιστορία, Μελέτη Περιβάλλοντος, Θρησκευτικά, Γεωγραφία, Αγωγή του Πολίτη). Η μεθοδολογία που χρησιμοποιήθηκε ήταν η ποσοτική και ποιοτική ανάλυση περιεχομένου για την έρευνα των κειμένων ενώ για την ανάλυση της εικονογράφησης αξιοποιήθηκαν ποσοτικές και ποιοτικές προσεγγίσεις. Η έρευνα έδειξε ότι τόσο στο επίπεδο των κειμένων όσο και της εικονογράφησης το αρχαιολογικό παρελθόν έχει ισχυρή παρουσία. Οι αρχαιολογικές και διαφοροποιημένες αναπαραστάσεις για την αρχαιολογία και τον υλικό πολιτισμό. Η ανάλυση έδειξε ότι οι κειμενικές και εικονογραφικές αφηγήσεις συμβάλλουν αποφασιστικά στην κατασκευή της εθνικής, πολιτισμικής και ταυτότητας του φύλου των μαθητών/τριών και στη διαμόρφωση στάσεων, αντιλήψεων και στερεοτύπων για την αρχαιολογία και τον πολιτισμό
description: The subject of the thesis is the identification, analysis and interpretation of the archaeological narratives of the current Greek Primary Education textbooks. For the study of the texts quantitive and qualitative content analysis was used whereas for the illustrations' analysis quantitative along with qualitative approaches were adopted. The research revealed that the archaeological past, textually and visually, has a strong presence in Primary textbooks. The archaeological narratives provide students multiple and diverse representations about archaeology and the material culture. Analysis showed that the visual and textual archaelogical narratives have a crusial contribution in shaping student cultural, ethnic and gender identity and in moulding student attitudes, perceptions and stereotypes about the past
Συμβολή στην πολιτική και κοινωνική ιστορία της έννοιας "Felicitas" στη Ρώμη των αυτοκρατορικών χρόνων
Creators: name: Ζάννη, Δούκαινα
Publisher: name: Aristotle University of Thessaloniki
Year: 2004
Subjects: Ελευθερία
Ειρήνη
Ασφάλεια
Πρόνοια
Αιωνιότητες
Φύση
Felicitas
Pax-Securitas
Libertas Senatus
Providentia
Aeternitas
Otium

description: Αντικείμενο της εργασίας είναι η έννοια της Felicitas Temporum την εποχή της ηγεμονίας. Στόχος της εργασίας ήταν να εντοπισθούν οι παραστάσεις της Felicitas με πολιτικό περιεχόμενο, οι οποίες προβάλλονται στους φορείς της αυτοκρατορικής ιδεολογίας και στα επίσημα έγγραφα, όσο και εκείνες κοινωνικού-πολιτικού περιεχομένου, που προκύπτουν από τα λογοτεχνικά και ιστορικά έργα της εποχής. Στην εργασία εξετάζεται και η κριτική που ασκήθηκς στην αυτοκρατορική ιδεολογία και παραστάσεις της Felicitas αντίθετες με τις πρώτες, οι οποίες εκφράζουν τις κοινωνικές και πολιτικές αντιλήψεις για το περιεχόμενο της, όπως αυτές καταγράφηκαν από τους συγγραφείς της εποχής
description: The thesis deals with the notion of Felicitas Temporum during yhe 1st and 2nd centuries a.C. in Rome. The political meaning of it comes out of the coins and the inscriptions the emperor used as the carriers of his propaganda. Its social-political meaning comes out of the litterary and historical works of the period. The ideas with which the opposition against the emperor are connected, allow the interpretation of Felicitas Temporum as a social and political notion the way it was conceived by the latin writers of the period, who doubted the truth of Felicitas Temporum as presented through imperial propaganda
Magnetic Monopole Dynamics, Supersymmetry, and Duality
Creators: name: Weinberg, Erick J.
name: Yi, Piljin
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We review the properties of BPS, or supersymmetric, magnetic monopoles, with an emphasis on their low-energy dynamics and their classical and quantum bound states. After an overview of magnetic monopoles, we discuss the BPS limit and its relation to supersymmetry. We then discuss the properties and construction of multimonopole solutions with a single nontrivial Higgs field. The low-energy dynamics of these monopoles is most easily understood in terms of the moduli space and its metric. We describe in detail several known examples of these. This is then extended to cases where the unbroken gauge symmetry include a non-Abelian factor. We next turn to the generic supersymmetric Yang-Mills (SYM) case, in which several adjoint Higgs fields are present. Working first at the classical level, we describe the effects of these additional scalar fields on the monopole dynamics, and then include the contribution of the fermionic zero modes to the low-energy dynamics. The resulting low-energy effective theory is itself supersymmetric. We discuss the quantization of this theory and its quantum BPS states, which are typically composed of several loosely bound compact dyonic cores. We close with a discussion of the D-brane realization of ${\cal N}=4$ SYM monopoles and dyons and explain the ADHMN construction of monopoles from the D-brane point of view.
description: 252 pages, 15 figures, review article, corrected dyon equations in chapters 2 and 3 and added discussion in chapter 8, typos corrected and references updated
Metrologie für die Digitalisierung von Wirtschaft und Gesellschaft | 2020
Creators: name: Eichstädt, Sascha
Publisher: name: Physikalisch-Technische Bundesanstalt (PTB)
Year: 2021
Subjects: digitale Transformation
Metrologie
Qualitätsinfrastruktur
Kalibrierung
Konformitätsbewertung
Künstliche Intelligenz
Sensornetzwerke
Autonomes Fahren

description: Die digitale Transformation setzt sich ungebremst weiter fort und beeinflusst in zunehmendem Maße die gesamte Qualitätsinfrastruktur. Die PTB hat ihre erstmals 2017 veröffentlichte Digitalisierungsstrategie überarbeitet und den aktuellen Entwicklungen angepasst. Viele Vorhaben sind bereits fortgeschritten (DCC, Metrology Cloud) und andere beginnen gerade (Metrologie für KI).
Feasibility of an electron-based crystalline undulator
Creators: name: Tabrizi, M.
name: Korol, A. V.
name: Solov'yov, A. V.
name: Greiner, Walter
Publisher: name: arXiv
Year: 2006
Subjects: subject: Accelerator Physics (physics.acc-ph)
subject: FOS: Physical sciences

description: The feasibility to generate powerful monochromatic radiation of the undulator type in the gamma region of the spectrum by means of planar channeling of ultra-relativistic electrons in a periodically bent crystal is proven. It is shown that an electron-based crystalline undulator operates in the regime of higher beam energies than a positron-based one does. A numerical analysis is performed for a 50 GeV electron channeling in Si along the (111) crystallographic planes.
description: 4 pages, 4 figures, revtex, submitted to PRL
Refinement of the physical and genetic maps of the MEN2A region in pericentromeric chromosome 10
Creators: name: Miller, Diane L.
Publisher: name: University of British Columbia
Year: 2008

description: The gene responsible for multiple endocrine neoplasia type 2A (MEN2A) has been localized to the pericentromeric region of chromosome 10.Several markers which fail to recombine with MEN2A have been identified including D10Z1, D10S94 , RET, D10S97, and D1OS102. Meiotic mapping in the MEN2A region is limited by a paucity of critical crossovers, attributable in part to reduced rates of recombination in the region, particularly in male meioses. Additional approaches for mapping loci in the pericentromeric region of chromosome 10 are required. The work described in this thesis involves the use of radiation reduced somatic cell hybrids to generate a detailed physical map, along with cloning and mapping of new DNA markers in the pericentromeric region of chromosome 10. The radiation reduced hybrids used for mapping studies all retain small subchromosomal fragments which include both D10S94 and D10Z1. One hybrid, pp11A, was chosen as the source of DNA for molecular cloning experiments. 106 human recombinant clones were isolated from lambda libraries made with pp11A DNA. Of these, 23 clones have been regionally localized using the radiation hybrid mapping panel. Eight markers have been identified which, when taken together with previously meiotically mapped markers, define eight radiation hybrid map intervals between D10S34 and RBP3. The predicted order of markers is the same using both the radiation hybrid mapping panel and a meiotic mapping panel. This combination cloning and mapping approach facilitates the precise positioning of new markers in pericentromeric chromosome 10 and aids in further refinement of the localization of MEN2A. Two new markers (D10S253 and D10S252) were assigned to the interval between D10S94 and RBP3 in 10q11.2 based on radiation hybrid mapping. Both were demonstrated to recombine with MEN2A. They flankMEN2A more closely than RBP3 and refine the interval to which the disease gene is assigned. The identification of these new flanking markers is of practical importance to DNA diagnostic programs for MEN 2A families and in efforts to clone the disease gene based on its chromosomal localization.
Optimal sampling of dynamical large deviations via matrix product states
Creators: name: Causer, Luke
name: Bañuls, Mari Carmen
name: Garrahan, Juan P.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The large deviation (LD) statistics of dynamical observables is encoded in the spectral properties of deformed Markov generators. Recent works have shown that tensor network methods are well suited to compute the relevant leading eigenvalues and eigenvectors accurately. However, the efficient generation of the corresponding rare trajectories is a harder task. Here we show how to exploit the MPS approximation of the dominant eigenvector to implement an efficient sampling scheme which closely resembles the optimal (so-called "Doob") dynamics that realises the rare events. We demonstrate our approach on three well-studied lattice models, the Fredrickson-Andersen and East kinetically constrained models (KCMs), and the symmetric simple exclusion process (SSEP). We discuss how to generalise our approach to higher dimensions.
description: 13 pages, 3 figures
Καμπυλότητες και γεωμετρία του Riemann σε διαφορίσιμες πολλαπλότητες
Creators: name: Καρατσομπάνης, Ιωάννης Ν.
Publisher: name: Aristotle University of Thessaloniki
Year: 2004
Subjects: Σύμμορφα επίπεδη
Q-ομογενής
Σολιτόνια Ricci
Μηχανική Χάμιλτον
Υδροδυναμική
Conformally flat
Q-homogeneous
Ricci solitons
Hamilton mechanics
Hydrodynamics

description: Στην διατριβή αυτή παρουσίάζονται νέα αποτελέσματα στις τρισδιάστατες πολλαπλότητες επαφής. Δίνονται εφαρμογές στη φυσική
description: We give some new results on three-dimensional contact metric manifolds. Selected applications on Physics are provided
Κατεργασία και ανακύκλωση στερεών τοξικών βιομηχανικών αποβλήτων που είναι επιβαρυμένα με μόλυβδο και βρωμιούχα
Creators: name: Ιωαννίδης, Θεμιστοκλής Α.
Publisher: name: Aristotle University of Thessaloniki
Year: 2004
Subjects: Υαλοποίηση, υδρομεταλλουργία, κατακρήμνιση, σταθεροποίηση
Υδροξείδιο του βρωμιούχου μολύβδου
Ανακύκλωση αποβλήτων
Vitrification, Hydrometallurgy, Precipitation, Stabilization
Lead bromide hydroxide
Waste recycling

description: Στην παρούσα διατριβή εξετάστηκαν διάφοροι τρόποι κατεργασίας και ανακύκλωσης ενός αποβλήτου που περιείχε μεγάλες αρχικές περιεκτικότητες Pb(~33%wt), Fe(~33%wt), BC(~10%wt). Προτάθηκε μεθοδολογία ελαχιστοποίησης των mol του αρχικού όξινου διαλύματος. Ακολουθώντας τις βελτιστοποιημένες συνθήκες που προτάθηκαν θα είναι δυνατό με την εφαρμογή ασθενών όξινων υδατικών διαλυμάτων HN0^(3) (0.1M-0.2M) σε αναλογία υγρού/στερεού(L/S)>30, να απομακρυνθούν ο μόλυβδος και τα βρωμιούχα, ενώ ο ταυτόχρονος διαχωρισμός(αποδέσμευση) του σιδήρου από το αρχικό απόβλητο βρέθηκε να είναι <1%wt. Το στερεό υπόλειμμα που παραμένει αποτελείται κυρίως από οξείδιο του σιδήρου για τα οποία υπάρχουν δυνατοί τρόποι ανακύκλωσης(π.χ. πρόσθετα θερμικών κατεργασιών και υαλοκεραμικών). Επίσης, παρουσιάστηκαν μια σειρά από δεδομένα και αναλύσεις για τις υδρόξυ μορφές του βρωμούχου μολύβδου(Pb(OH)Br)
description: The present thesis examines various ways of treatment and recycling of an industrial solid toxic waste that contained significant amounts of lead(~30%wt), iron(~33%w/t) and bromide(~10%w/t). A method of limiting the acid is proposed. The application of weak acids(0.1M-0.2M) at a liquid/solid ratio(L/S)>30 with quantively remove the initial lead and brimide content, while almost the rntire amount of iron will remain at the solid residue. The latter one can be used as a first raw material(i.e. for the production of glass ceramic materials0. Also, a series of data are presented concerning the hydroxy forms of lead bromide salts(Pb(OH)Br)
Kerr Nonlinear Instability: Classical and Quantum Optical Theories
Creators: name: Nesrallah, Michael
Publisher: name: Université d'Ottawa / University of Ottawa
Year: 2019
Subjects: Nonlinear Optics
Quantum Optics
Light-Matter Interaction
Laser Amplification

description: An important aspect of third-order optical nonlinearity is the intensity-dependent refractive index, where the intensity of the light itself affects the refractive index. This nonlinear effect is known as Kerr nonlinearity. In this work, a theory of amplification based on Kerr nonlinearity is developed. Kerr nonlinearity is well known to exhibit instability. Our amplification theory is based on seeding this instability. The full theory is developed to obtain the vectorial wave equations of the instability. It is shown that for materials of interest, vectorial effects are negligible across the instability regime and the scalar theory gives an accurate account of Kerr instability amplification. It is also shown that this instability analysis is a spatiotemporal generalization to four-wave mixing, modulation instability, and filamentation instability. It fact, it can be considered a seeded conical emission process. Subsequently, the theory of plane wave Kerr instability is explored. Quantitatively, the importance of pump wavelength, linear dispersive properties, and non-collinear angles for optimal amplification are demonstrated. Next, the seed beam is generalized to a finite Gaussian pulse in both time and space; the effect of a finite seed beam is quantitatively analyzed. Our analysis of Kerr instability in bulk dielectric crystals demonstrates the potential to amplify pulses in the wavelength range of ~1-14 μm. Whereas plane wave amplification is shown to extend to 40 μm in the example materials shown, material damage limits finite pulse Kerr instability amplification to about 14μm. There, seed pulse output energies in the 50 μJ range appear feasible with a ratio of pump to seed pulse energy in the range 400-500. Three key aspects of Kerr amplification are the capacity for single cycle pulse amplification, that it is intrinsically phase-matched, and its simplicity and versatility. As the Kerr instability gain profile is of Bessel-Gaussian nature in the transverse space domain, it lends itself naturally to the amplification of Bessel-Gauss beams. It is shown that pump-to-seed energy amplification that is more effcient than the Gaussian case by a factor of about 5-7. Whereas in the Gaussian case, the efficiency is on the order of about 0.15-0.2%, in the Bessel-Gaussian case it is on the order of about 1%. It is also demonstrated that Bessel-Gaussian seed beams centered at longer wavelengths than ordinary Gaussian beams may be amplified. Lastly, Bessel-Gauss beams are known to have favourable properties, such as being diffraction-free over a certain propagation range. Finally, a quantum optical theory of Kerr instability is developed. In particular, we explore a theory of the generation of ultrashort photon pairs (biphotons) from vacuum with Kerr instability.
Deep MMT Transit Survey of the Open Cluster M37 III: Stellar Rotation at 550 Myr
Creators: name: Hartman, J. D.
name: Gaudi, B. S.
name: Pinsonneault, M. H.
name: Stanek, K. Z.
name: Holman, M. J.
name: McLeod, B. A.
name: Meibom, S.
name: Barranco, J. A.
name: Kalirai, J. S.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: In the course of conducting a deep (14.5 ~< r ~< 23), 20 night survey for transiting planets in the rich ~550 Myr old open cluster M37 we have measured the rotation periods of 575 stars which lie near the cluster main sequence, with masses 0.2 Msun ~< M ~< 1.3 Msun. This is the largest sample of rotation periods for a cluster older than 500 Myr. Using this rich sample we investigate a number of relations between rotation period, color and the amplitude of photometric variability. Stars with M >~ 0.8 Msun show a tight correlation between period and mass with heavier stars rotating more rapidly. There is a group of 4 stars with P > 15 days that fall well above this relation, which, if real, would present a significant challenge to theories of stellar angular momentum evolution. Below 0.8 Msun the stars continue to follow the period-mass correlation but with a broad tail of rapid rotators that expands to shorter periods with decreasing mass. We combine these results with observations of other open clusters to test the standard theory of lower-main sequence stellar angular momentum evolution. We find that the model reproduces the observations for solar mass stars, but discrepancies are apparent for stars with 0.6 ~< M ~< 1.0 Msun. We also find that for late-K through early-M dwarf stars in this cluster rapid rotators tend to be bluer than slow rotators in B-V but redder than slow rotators in V-I_{C}. This result supports the hypothesis that the significant discrepancy between the observed and predicted temperatures and radii of low-mass main sequence stars is due to stellar activity.
description: Replaced with version accepted to ApJ. 104 pages, 7 tables, 26 figures
Convergence of distributions on paths
Creators: name: Abbes, Samy
Publisher: name: arXiv
Year: 2024
Subjects: subject: Probability (math.PR)
subject: Combinatorics (math.CO)
subject: FOS: Mathematics

description: We study the convergence of distributions on finite paths of weighted digraphs, namely the family of Boltzmann distributions and the sequence of uniform distributions. Targeting applications to the convergence of distributions on paths, we revisit some known results from reducible nonnegative matrix theory and obtain new ones, with a systematic use of tools from analytic combinatorics. In several fields of mathematics, computer science and system theory, including concurreny theory, one frequently faces non strongly connected weighted digraphs encoding the elements of combinatorial structures of interest; this motivates our study.
description: 24 pages, proofs at the end
ALMA Observations of Giant Molecular Clouds in M33 III: Spatially Resolved Features of the Star-Formation Inactive Million-solar-mass Cloud
Creators: name: Kondo, Hiroshi
name: Tokuda, Kazuki
name: Muraoka, Kazuyuki
name: Nishimura, Atsushi
name: Fujita, Shinji
name: Tosaki, Tomoka
name: Zahorecz, Sarolta
name: Miura, Rie E.
name: Kobayashi, Masato I. N.
name: Onodera, Sachiko
name: Torii, Kazufumi
name: Kuno, Nario
name: Sano, Hidetoshi
name: Onishi, Toshikazu
name: Saigo, Kazuya
name: Fukui, Yasuo
name: Kawamura, Akiko
name: Tsuge, Kisetsu
name: Tachihara, Kengo
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present $^{12}$CO ($J$ = 2-1), $^{13}$CO ($J$ = 2-1), and C$^{18}$O ($J$ = 2-1) observations toward GMC-8, one of the most massive giant molecular clouds (GMCs) in M33 using ALMA with an angular resolution of 0".44 $\times$ 0".27 ($\sim$2 pc $\times$ 1pc). The earlier studies revealed that its high-mass star formation is inactive in spite of a sufficient molecular reservoir with the total mass of $\sim$10$^{6}$ $M_{\odot}$. The high-angular resolution data enable us to resolve this peculiar source down to a molecular clump scale. One of the GMC's remarkable features is that a round-shaped gas structure (the "Main cloud" ) extends over $\sim$50 pc scale, which is quite different from the other two active star-forming GMCs dominated by remarkable filaments/shells obtained by our series of studies in M33. The fraction of the relatively dense gas traced by the $^{13}$CO data with respect to the total molecular mass is only $\sim$2 %, suggesting that their spatial structure and the density are not well developed to reach an active star formation. The CO velocity analysis shows that the GMC is composed of a single component as a whole, but we found some local velocity fluctuations in the Main cloud and extra blueshifted components at the outer regions. Comparing the CO with previously published large-scale H I data, we suggest that an external atomic gas flow supplied a sufficient amount of material to grow the GMC up to $\sim$10$^6$ $M_{\odot}$.
description: 16 pages, 9 figures, accepted for publication in The Astrophysical Journal ; 10.3847/1538-4357/abeb65
Fig. S4 and Tables S1–S3: Effects of melt-percolation, refertilization and deformation on upper mantle seismic anisotropy: constraints from peridotite xenoliths, Marie Byrd Land, West Antarctica
Creators: name: V. Chatzaras
name: S.C. Kruckenberg
Publisher: name: Geological Society of London
Year: 2021
Subjects: subject: Geology
subject: FOS: Earth and related environmental sciences

description: Calculated seismic properties of individual xenoliths from Marie Byrd Land, West Antarctica (S4), geographical coordinates of the volcanic centres (Table S1), mineral major element composition (Table S2) and synthetic seismic properties by modal composition (Table S3)
Nuclear reaction studies of unstable nuclei using relativistic mean field formalisms in conjunction with Glauber model
Creators: name: Shukla, A.
name: Sharma, B. K.
name: Chandra, R.
name: Arumugam, P.
name: Patra, S. K.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We study nuclear reaction cross-sections for stable and unstable projectiles and targets within Glauber model, using densities obtained from various relativistic mean field formalisms. The calculated cross-sections are compared with the experimental data in some specific cases. We also evaluate the differential scattering cross-sections at several incident energies, and observe that the results found from various densities are similar at smaller scattering angles, whereas a systematic deviation is noticed at large angles. In general, these results agree fairly well with the experimental data.
description: 9 pages, 7 figures, submitted to PRC
WHAT ARE PHARMACIST'S EXPECTATIONS REGARDING PRIMARY CARE PHARMACY SERVICE?--A PRELIMINARY STUDY OF NORMATIVE EXPECTATIONS IN THE PUBLIC HEALTH SYSTEM IN THAILAND
Creators: name: Tida Sottiyotin
name: Tanavij Pannoi
Publisher: name: Chulalongkorn Universtiy Press
Year: 2015
Subjects: Pharmacist's expectation,Primary care pharmacy service, Primary healthcare services,Thailand

description: 4, 29, Journal of Health Research
Ανάλυση και διαμόρφωση σύγχρονων συστημάτων δασεργατικής εκπαίδευσης για την ελληνική δασοπονία
Creators: name: Τσιώρας, Πέτρος Α.
Publisher: name: Aristotle University of Thessaloniki
Year: 2004
Subjects: Δασεργατική εκπαίδευση
Δασεργάτης
Forestry workers' training
Forest worker

description: Σκοπός της έρευνας ήταν η διαμόρφωση ενός σύγχρονου συστήματος δασεργατικής εκπαίδευσης προσαρμοσμένου στις ανάγκες της ελληνικής δασοπονίας. Η έρευνα πραγματοποιήθηκε με ταχυδρομική αποστολή ερωτηματολογίων σε δασολόγους και ειδικούς πάνω σε θέματα δασικών εργασιών σε όλη την Ελλάδα και με προσωπικές συνεντεύξεις δασεργατών στα γεωγραφικά διαμερίσματα της Θράκης, της Μακεδονίας, της Ηπείρου και της Θεσσαλίας. Τα πορίσματα της εμπειρικής έρευνας σε συνδυασμό με τις σύγχρονες εξελίξεις, τη διεθνή εμπειρία και τις ιδιαίτερες συνθήκες του ελλαδικού χώρου οδήγησαν στην πρόταση ενός ολοκληρωμένου συστήματος δασεργατικής εκπαίδευσης. Σε αυτό υπάρχει πρόβλεψη για την αρχική, τη συνεχιζόμενη εκπαίδευση και τη μετεκπαίδευση των ειδικοτήτων του εκπαιδευόμενου δασεργάτη, του χειριστή δασικών μηχανημάτων και του αρχιτεχνίτη δασεργάτη. Παράλληλα γίνονται προτάσεις χρήσης των νέων τεχνολογιών πληροφορικής, οι οποίες συνοδεύονται από ένα ενδεικτικό τίτλο πολυμέσων. Η δασεργατική εκπαίδευση μπορεί να συνεισφέρει αποτελεσματικά στο διττό της ρόλο της παροχής καλά εκπαιδευμένου προσωπικού, αναγκαίου για την υλοποίηση των στόχων μίας σύγχρονης αειφορικής και πολυλειτουργικής δασοπονίας και της εξασφάλισης ασφαλέστερης και με καλύτερες συνθήκες απασχόλησης σε κατοίκους της ορεινής Ελλάδας στις δασικές εργασίες
description: Aim of this research was the formation of a modern forestry workers' training system adapted to the needs of greek forestry. Questionnaires were sent by post to forester engineers and forestry works specialists all over Greece and forest workers were interviewed in the regions of Thessaly, Macedonia, Thrace and Epirus. The combination of the research results', the modern developments, as well as the international experience has led to the proposal of n integrated forestry workers' training system. This describes the initial and further training for the proposed specializations of trined forest worker, forest machines operator and master craftman. Ways of possible use of multimedia technologies are also described and are followed by a multimedia CD. Forest workers' training can significantly contibute to its dual role : the provision of well trained personnel, capable of coping with the demands of a modern and multifunctional forestry and guarantying better and safer working conditions in forest works for the inhabitants of Mountain Greece
An estimate of the gravitational-wave background from the observed cosmological distribution of quasars
Creators: name: Sanchis-Gual, Nicolas
name: Quilis, Vicent
name: Font, José A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We study the gravitational-wave background from the observed cosmological quasar distribution. Using the DR9Q quasar catalogue from the ninth data release of the Sloan Digital Sky Survey (SDSS), we create a complete, statistically consistent sample of quasars from $z=0.3$ to $5.4$. Employing the spectroscopic information from the catalogue we estimate the masses of the supermassive black holes hosted by the quasars in the sample, resulting in a log-normal distribution of mean $10^{8.32\pm0.33}M_{\odot}$. The computation of the individual gravitational-wave strains relies on specific functional forms derived from simulations of gravitational collapse and mergers of massive black hole binaries. The background gravitational-wave emission is assembled by adding up the individual signals from each quasar modelled as plane waves whose interference can be constructive or destructive depending on the quasar evolutionary state. Our results indicate that the estimated gravitational-wave background discussed in this work could only be marginally detectable by LISA. This conclusion might change if more complete quasar catalogs than that provided by the SDSS were available.
description: 7 pages, 4 figures. Accepted for publication in Physical Review D
Οι ιδεαλιστικές απεικονίσεις των ρωμαίων αυτοκρατόρων
Creators: name: Παπαζαφειρίου, Γεώργιος Α.
Publisher: name: Aristotle University of Thessaloniki
Year: 2004
Subjects: Αντίγραφο
Σύμβολο
Ανδριάντας
Copie
Symbol
Statue

description: Στόχοι της διατριβής είναι 1) η πλήρης μελέτη των ιδεαλιστικών απεικονίσεων των ρωμαίων αυτοκρατόρων και των υπολοίπων ανδρικών μελών του αυτοκρατορικού οίκου, 2)η συγκέντρωση των πληροφοριών που προσφέρουν, για να κατανοήσουμε τον προπαγανδιστικό μηχανισμό της εποχής και 3) η συναγωγή συμπερασμάτων για τον παραλληλισμό των αυτοκρατόρων με θεούς και ήρωες μέσα από τη συνδυαστική μελέτη της τυπολογίας και της εικονογραφίας. Παρουσιάζεται η ορολογία και η ιστορία της έρευνας γύρω από το αντικείμενο αυτό και ακολουθούν τα πέντε κύρια μέρη της διατριβής. Στο πρώτο εξετάζονται οι σωζόμενες γραπτές μαρτυρίες και στο δεύτερο οι προγενέστεροι ιδεαλιστικοί τύποι απεικόνισης, του Αλέξανδρου, των ελληνιστικών ηγεμόνων και των ρωμαίων της ρεπουμπλικανικής περιόδου αυτοκρατορικών απεικονίσεων(τρίτο μέρος), η χρονική και γεωγραφική τους διάδοση, οι χώροι ανάθεσης και η παρουσία τους σε αγαλματικά σύνολα(τέταρτο μέρος) και ο παραλληλισμός τους με θεούς και ήρωες(πέμπτο μέρος)
description: The goals of this Phd were 1) the study of the typology of the imperial idealistic figures 2) the concentration of the information that this category of figures offer to understand the roman propagandistic mechanism of the imperial period 3) the assemblance of conclusions for the comparison of the roman emperors with various gods and heroes through typology and iconography. The terminology and the history of the research are presented in the introduction. Next come the 5 main parts of this study. Part one includes all the known references in the ancient literature about the idealistic statues and the second the idealistic statuary types of rulers before the roman imperial period(Alexander, Hellenistic Kings) and the private citizens of the republican period. Next are examined the idealistic types of the Roman Emperors(part three), the chronology, the geographical diffusion, the building and places where they were dedicated and their presence in the dynastic group monuments(part four) and finally the connection with various gods and heroes(part five)
Figs S1–S3: Effects of melt-percolation, refertilization and deformation on upper mantle seismic anisotropy: constraints from peridotite xenoliths, Marie Byrd Land, West Antarctica
Creators: name: V. Chatzaras
name: S.C. Kruckenberg
Publisher: name: Geological Society of London
Year: 2021
Subjects: subject: Geology
subject: FOS: Earth and related environmental sciences

description: Examples of mantle xenoliths from Fosdick Mountains, Marie Byrd Land (S1), crystallographic orientations of olivine, orthopyroxene and clinopyroxene (S2) and variation of olivine, orthopyroxene and clinopyroxene CPO strength with temperature (S3)
Is nuclear deterrence rational?
Creators: name: Otterstein, Roland O.
Publisher: name: University of British Columbia
Year: 2008

description: In the introduction I give a brief history of the concept of "nuclear deterrence." Next I discuss ways of approaching the subject that conform to popular views. I reject the Scripture's "an eye for an eye" principle as a basis for nuclear strategy decisions and claim that a utilitarian model is acceptable. In Chapter One I discuss cases involving rational opponents who possess large-scale nuclear capability. The discussion focuses on a refutation and counter argument to David Gauthier's view of this sort of case. I claim that we must adopt a model of decision making according to which individual nuclear acts rather than nuclear policies are subjected to rational scrutiny. In Chapter Two I discuss a wide range of nuclear deterrence scenarios and attempt to give a comprehensive analysis of the subject. I discuss what sorts of factors need to be taken into consideration in assessing the rationality of nuclear acts. I construct tables which state under what circumstances initiating or retaliating against an act of nuclear war is rational. In Chapter Three I discuss cases in which a rational country faces an irrational opponent, and conclude that, given that nuclear weapons are quite likely to fall into the hands of an irrational leader, nuclear war is quite likely to occur. In Chapter Four I focus on cases in which countries have the capability to wipe out nearly all of their enemy's weapons in a single attack. I argue that this capability makes nuclear war considerably more likely to occur so that it is rational to avoid it. In Chapter Five I discuss the possibility of limited nuclear attacks. I argue that while such attacks have some chance of being part of rational military strategies, we should concentrate our efforts on building highly effective conventional weapons, since these are less dangerous in the long run. I conclude that we should lessen our dependence on nuclear weapons. I claim that in the majority of cases, nuclear disarmamentis the most rational policy.
The mass distribution of stellar mergers: A new scenario for several FS CMa stars
Creators: name: Dvořáková, N.
name: Korčáková, D.
name: Dinnbier, F.
name: Kroupa, P.
Publisher: name: arXiv
Year: 2024
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: (Abreviated) FS CMa stars belong to a diverse group of stars exhibiting the B[e] phenomenon, which is manifested mainly by the presence of forbidden emission lines and a~strong infrared (IR) excess in their spectra. Recently, a strong magnetic field has been discovered in the FS CMa star IRAS 17449+2320. Its strength and an unusually high space velocity point to a post-merger nature. Stellar mergers may provide an explanation for the complex and sometimes chaotic behaviour of some of the FS CMa stars. We did a statistical study of numerical simulations using Aarseth's NBODY6 code. We show the importance of stellar mergers of low- to intermediate-mass stars (from $\approx$ 1.4 to $\approx$ 8 $\text{M}_{\odot}$) and for B-type stars in particular. We analysed two sets of N-body simulations with different initial orbital period distributions. In the simulations, more massive binaries are treated differently than less massive binaries and the mass limit usually used is 5 $\text{M}_{\odot}$. We also used the value of 2 $\text{M}_{\odot}$ to test the influence of this ambiguous limit on the results. Looking at mass, distance from their birth cluster, and velocity distributions, we investigated the statistical significance of individual spectral types in terms of merger dynamics and how merger events affect the stellar evolution. We found that around 50 \% of stars in the simulated open clusters involved in the formation of mergers are B-type stars. As a result, more than 50 \% of the merger products end up as a B-type star as well. Between 12.54 \% and 23.24 \% of all B-type stars are mergers. These results are a natural consequence of the initial mass function, initial distribution of the binary star parameters, and large range of masses for B-type stars. We present a comparison of the W component and the space velocity of the simulated mergers with a sample of observed FS CMa stars.
description: 15 pages, 12 figures including appendix, version after language correction, before the production stage
Additional file 1 of phasebook: haplotype-aware de novo assembly of diploid genomes from long reads
Creators: name: Luo, Xiao
name: Kang, Xiongbin
name: Schönhuth, Alexander
Publisher: name: figshare
Year: 2021
Subjects: subject: Genetics
subject: FOS: Biological sciences

description: Additional file 1 Supplement: This contains all supplementary materials referenced in the main text.
Turbulence characteristics of the Bödewadt layer in a large enclosed rotor-stator system
Creators: name: Randriamampianina, Anthony
name: Poncet, Sébastien
Publisher: name: arXiv
Year: 2006
Subjects: subject: Classical Physics (physics.class-ph)
subject: FOS: Physical sciences

description: A three-dimensional (3D) direct numerical simulation is combined with a laboratory study to describe the turbulent flow in an enclosed annular rotor-stator cavity characterized by a large aspect ratio G=(b-a)/h=18.32 and a small radius ratio a/b=0.152, where a and b are the inner and outer radii of the rotating disk and h is the interdisk spacing. The rotation rate Omega under consideration is equivalent to the rotational Reynolds number Re=Omegab2/nu=9.5 x 104, where nu is the kinematic viscosity of the fluid. This corresponds to a value at which an experiment carried out at the laboratory has shown that the stator boundary layer is turbulent, whereas the rotor boundary layer is still laminar. Comparisons of the 3D computed solution with velocity measurements have given good agreement for the mean and turbulent fields. The results enhance evidence of weak turbulence at this Reynolds number, by comparing the turbulence properties with available data in the literature. An approximately self-similar boundary layer behavior is observed along the stator side. The reduction of the structural parameter a1 under the typical value 0.15 and the variation in the wall-normal direction of the different characteristic angles show that this boundary layer is three-dimensional. A quadrant analysis of conditionally averaged velocities is performed to identify the contributions of different events (ejections and sweeps) on the Reynolds shear stress producing vortical structures. The asymmetries observed in the conditionally averaged quadrant analysis are dominated by Reynolds stress-producing events in this Bödewadt layer. Moreover, case 1 vortices (with a positive wall induced velocity) are found to be the major source of generation of special strong events, in agreement with the conclusions of Lygren and Andersson.
description: 16 pages
Resolving the Complex Evolution of a Supermassive Black Hole Triplet in a Cosmological Simulation
Creators: name: Mannerkoski, Matias
name: Johansson, Peter H.
name: Rantala, Antti
name: Naab, Thorsten
name: Liao, Shihong
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present here a self-consistent cosmological zoom-in simulation of a triple supermassive black hole (SMBH) system forming in a complex multiple galaxy merger. The simulation is run with an updated version of our code KETJU, which is able to follow the motion of SMBHs down to separations of tens of Schwarzschild radii while simultaneously modeling the large-scale astrophysical processes in the surrounding galaxies, such as gas cooling, star formation, and stellar and AGN feedback. Our simulation produces initially a SMBH binary system for which the hardening process is interrupted by the late arrival of a third SMBH. The KETJU code is able to accurately model the complex behavior occurring in such a triple SMBH system, including the ejection of one SMBH to a kiloparsec-scale orbit in the galaxy due to strong three-body interactions as well as Lidov-Kozai oscillations suppressed by relativistic precession when the SMBHs are in a hierarchical configuration. One pair of SMBHs merges $\sim 3\,\mathrm{Gyr}$ after the initial galaxy merger, while the remaining binary is at a parsec-scale separation when the simulation ends at redshift $z=0$. We also show that KETJU can capture the effects of the SMBH binaries and triplets on the surrounding stellar population, which can affect the binary merger timescales as the stellar density in the system evolves. Our results demonstrate the importance of dynamically resolving the complex behavior of multiple SMBHs in galactic mergers, as such systems cannot be readily modeled using simple orbit-averaged semi-analytic models.
description: 8 pages, 5 figures. One new figure and minor edits to text. Published in ApJL