cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Fast spectral line calculations with the escape probability method and tests with synthetic observations of interstellar clouds
Creators: name: Juvela, Mika
Publisher: name: arXiv
Year: 2025
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Radiative transfer effects need to be taken into account when analysing spectral line observations. When the data are not sufficient for detailed modelling, simpler methods are needed. The escape probability formalism (EPF) is one such tool. We wish to quantify the model errors in the EPF analysis of interstellar clouds and cores. We introduce PEP, a parallel program for calculating fast EPF parameters quickly. We model full radiative transfer to generate synthetic observations for various cloud models. These are examined with the PEP program, and their results are compared to the actual beam-averaged kinetic temperatures, column densities, and volume densities. PEP enables the calculations of even millions of parameter combinations in a matter of seconds. However, the simple assumptions of EPF can lead to significant errors. In the tests the errors were typically within a factor of two, but could in some cases reach an order of magnitude. The model errors are thus similar or even larger than the statistical errors caused by the typical observational noise. Due to degeneracies, parameter combinations are better constrained than the individual parameters. The model errors could be reduced by using full radiative transfer modelling. However, in the absence of full knowledge of the source structure, the errors are difficult to quantify. We also present a method for approximate handling of hyperfine structure lines in EPF calculations. Both the observational statistical errors and the model errors need to be considered when estimating the reliability of EPF results. Full radiative transfer modelling is needed to better understand the true uncertainties.
description: Accepted for publication in A&A
Weakening gravity for dark matter in a type-II minimally modified gravity
Creators: name: De Felice, Antonio
name: Mukohyama, Shinji
Publisher: name: arXiv
Year: 2020
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We propose a new cosmological framework in which the strength of the gravitational force acted on dark matter at late time can be weaker than that on the standard matter fields without introducing extra gravitational degrees of freedom. The framework integrates dark matter into a type-II minimally modified gravity that was recently proposed as a dark energy mimicker. The idea that makes such a framework possible consists of coupling a dark matter Lagrangian and a cosmological constant to the metric in a canonically transformed frame of general relativity (GR). On imposing a gauge fixing constraint, which explicitly breaks the temporal diffeomorphism invariance, we keep the number of gravitational degrees of freedom to be two, as in GR. We then make the inverse canonical transformation to bring the theory back to the original frame, where one can add the standard matter fields. This framework contains two free functions of time which specify the generating functional of the above mentioned canonical transformation and which are then used in order to realize desired time evolutions of both the Hubble expansion rate $H(z)$ and the effective gravitational constant for dark matter $G_{\rm eff}(z)$. The aim of this paper is therefore to provide a new framework to address the two puzzles present in today's cosmology, i.e. the $H_0$ tension and the $S_8$ tension, simultaneously. When the dark matter is cold in this framework, we dub the corresponding cosmological model the V Canonical Cold Dark Matter (VCCDM), as the cosmological constant $Λ$ in the standard $Λ$CDM is replaced by a function $V(ϕ)$ of an auxiliary field $ϕ$ and the CDM is minimally coupled to the metric in a canonically transformed frame.
description: 17 pages, 1 figure, uses revtex4-2
Efficient Monte Carlo sampling by parallel marginalization
Creators: name: Weare, Jonathan
Publisher: name: arXiv
Year: 2007
Subjects: subject: Numerical Analysis (math.NA)
subject: Statistics Theory (math.ST)
subject: FOS: Mathematics
subject: 65C05, 65C20, 62P35

description: Markov chain Monte Carlo sampling methods often suffer from long correlation times. Consequently, these methods must be run for many steps to generate an independent sample. In this paper a method is proposed to overcome this difficulty. The method utilizes information from rapidly equilibrating coarse Markov chains that sample marginal distributions of the full system. This is accomplished through exchanges between the full chain and the auxiliary coarse chains. Results of numerical tests on the bridge sampling and filtering/smoothing problems for a stochastic differential equation are presented.
description: 7 figures, 2 figures, PNAS .cls and .sty files, submitted to PNAS
Analyse et Evaluation des déterminants de la motivation des agents de l'administration publique : cas de la Direction des Ressources Humaines du Secteur des Armées du Mali (DRH-SA)
Creators: name: Alhousseiny Samba TRAORE
name: Adama DIABATE
Publisher: name: Zenodo
Year: 2024

description: Cet article a comme objectif d'analyser et évaluer les déterminants de la motivation des agents dans l'efficacité des services ressources humaines de l'administration en général et à la Direction des Ressources Humaines du Secteur des Armées en particulier. Le développement économique et sociopolitique d’une nation se base sur les ressources humaines dont elle dispose. Elle joue un rôle primordial dans le développement d’un pays. C’est pourquoi les pays en voie de développement doivent faire de la motivation de ces ressources une priorité dans leurs préoccupations. L’intérêt premier de cette recherche consiste à montrer une logique de raisonnement sur l’effet de la motivation du personnel dans l’administration Malienne. La problématique met pression aux dirigeants sur les rôles que jouent cette fin aux agents. Nous avons adopté un positionnement épistémologique interprétativiste et une approche inductive.
A Structural Equation Model for Spiritual Service Volunteer Labor Supply at Brahma Kumaris World Spiritual University
Creators: name: Juergen Woeckl And Tanin Chaiyesh
Publisher: name: Center for Applied Economics Research (CAER), Faculty of Economics, Kasetsart University
Year: 2014
Subjects: Volunteering, Structural Equation Modeling

description: 1, 21, Applied Economics Journal
Supplementary Material to "Through the Lens of Sequence Submodularity" and "A Unifying Look at Sequence Submodularity".
Creators: name: Bernardini, Sara
name: Fagnani, Fabio
name: Piacentini, Chiara
Publisher: name: Zenodo
Year: 2020
Subjects: Sequence Submodularity, Optimization

description: Supplementary material, dataset and source code
MPEC 2024-T176 : 2024 TW4
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2024
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2024 TW4

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Topological features of ground states and topological solitons in generalized Su-Schrieffer-Heeger models using generalized time-reversal, particle-hole, and chiral symmetries
Creators: name: Han, Sang-Hoon
name: Jeong, Seung-Gyo
name: Kim, Sun-Woo
name: Kim, Tae-Hwan
name: Cheon, Sangmo
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Pattern Formation and Solitons (nlin.PS)
subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Topological phases and their topological features are enriched by the fundamental time-reversal, particle-hole, and chiral as well as crystalline symmetries. While one-dimensional (1D) generalized Su-Schrieffer-Heeger (SSH) systems show various topological phenomena such as topological solitons and topological charge pumping, it remains unclear how such symmetry protects and relates such topological phenomena. Here we show that the generalized time-reversal, particle-hole, and chiral symmetry operators consistently explain not only the symmetry transformation properties between the ground states but also the topological features of the topological solitons in prototypical quasi-1D systems such as the SSH, Rice-Mele, and double-chain models. As a consequence, we classify generalized essential operators into three groups: Class I and class II operators connect ground states in between after spontaneous symmetry breaking while class III operators give the generalized particle-hole and chiral symmetries to ground states. Furthermore, class I operators endow the equivalence relation between topological solitons while class II and III operators do the particle-hole relations. Finally, we demonstrate three distinct types of topological charge pumping and soliton chirality from the viewpoint of class I, II, and III operators. We build a general framework to explore the topological features of the generalized 1D electronic system, which can be easily applied in various condensed matter systems as well as photonic crystal and cold atomic systems.
description: 18 pages, 7 figures, 8 tables
Criteria for Bochner's extension problem
Creators: name: Ruzhansky, Michael
name: Sugimoto, Mitsuru
Publisher: name: arXiv
Year: 2008
Subjects: subject: Analysis of PDEs (math.AP)
subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 35B60, 35D10

description: A necessary and sufficient condition for the resolution of the weak extension problem is given. This criterion is applied to also give a criterion for the solvability of the classical Bochner's extension problem in the $L^p$-category. The solution of the $L^p$-extension problem by Bochner giving the relation between the order of the operator, the dimension, and index $p$, for which the $L^p$-extension property holds, can be viewed as a subcritical case of the general $L^p$-extension problem. In general, this property fails in some critical and in all supercritical cases. In this paper, the $L^p$-extension problem is investigated for operators of all orders and for all $1\leq p\leq\infty$. Necessary and sufficient conditions on the subset of $L^p$ are given for which the $L^p$-extension property still holds, in the critical and supercritical cases.
description: 12 pages
Teacher’s self-talk : an examination of teacher’s use of self-talk and its impact on anxiety and job satisfaction
Creators: name: Ross, David
Publisher: name: University of British Columbia
Year: 2009

description: A cognitive-behavioral intervention, specifically focusing on self-talk, was designed to help teachers cope with anxiety. This study examined the nature of teacher self-talk and the efficacy of an intervention program, based on stress inoculation training, in the treatment of teacher stress and job satisfaction. The participants (17 females and 2 males) were full-time elementary and junior high classroom teachers assigned to a treatment group or a waitlist control group. The intervention program consisted of six 90-minute sessions conducted over six weeks. The State-Trait Anxiety Inventory (Spielberger, Gorsuch, Lushene, Bagg, & Jacobs, 1983), the Automatic Thoughts Questionnaire - Revised (Kendall, Howard, & Hays, 1989), and the Job Satisfaction sub-scale of the Teacher Stress Inventory-Revised (Schutz & Long, 1988) were administered at pre, post, and one month follow-up. It was predicted that from pre to post participants in the treatment group would show greater change in the measures than the participants in the waitlist control group. Using the States of Mind (SOM) model (Schwartz & Garamoni, 1986) it was further predicted that all participants would report a greater frequency of negative self-talk than positive selftalk at pretest. The results indicated that participants used more positive self-talk than negative self-talk at pretest, and that participants reported self-talk in the SOM range of positive monologue. Although dependent variables changed in the expected directions, repeated measures analysis of variance did not reveal significant interactions for the dependent variables. However, significant time effects emerged for positive and negative self-talk, for anxiety, but not for job satisfaction. Clinically significant change in anxiety was reported for 13 of 17 participants. Anxiety was significantly correlated with positive and negative self-talk; whereas, job satisfaction significantly correlated with negative self-talk. Although the increase in the ratio of positive self-talk and the reduction in anxiety may be due to treatment effects, the results failed to reach significance. Implications for theory and practice are discussed.
The H$α$ Dots Survey. II. A Second List of Faint Emission-Line Objects
Creators: name: Salzer, John J.
name: Feddersen, Jesse R.
name: Derloshon, Kathryn
name: Gronwall, Caryl
name: Van Sistine, Angela
name: Sugden, Arthur
name: Janowiecki, Steven
name: Hirschauer, Alec S.
name: Kellar, Jessica A.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present the second catalog of serendipitously discovered compact extragalactic emission-line sources -- H$α$ Dots. These objects have been discovered in searches of moderately deep narrow-band images acquired for the ALFALFA H$α$ project (Van Sistine et al. 2016). In addition to cataloging 119 new H$α$ Dots, we also present follow-up spectral data for the full sample. These spectra allow us to confirm the nature of these objects as true extragalactic emission-line objects, to classify them in terms of activity type (star forming or AGN), and to identify the emission line via which they were discovered. We tabulate photometric and spectroscopic data for the all objects, and present an overview of the properties of the full H$α$ Dot sample. The H$α$ Dots represent a broad range of star-forming and active galaxies detected via several different emission lines over a wide range of redshifts. The sample includes H$α$-detected blue compact dwarf galaxies at low redshift, [\ion{O}{3}]-detected Seyfert 2 and Green Pea-like galaxies at intermediate redshifts, and QSOs detected via one of several UV emission lines, including Ly$α$. Despite the heterogeneous appearance of the resulting catalog of objects, we show that our selection method leads to well-defined samples of specific classes of emission-line objects with properties that allow for statistical studies of each class.
description: Accepted for publication in the Astronomical Journal
A spectral sequence for Khovanov homology with an application to (3,q)-torus links
Creators: name: Turner, Paul
Publisher: name: arXiv
Year: 2006
Subjects: subject: Geometric Topology (math.GT)
subject: Quantum Algebra (math.QA)
subject: FOS: Mathematics
subject: 57M25

description: A spectral sequence converging to Khovanov homology is constructed which is applied to calculate the rational Khovanov homology of (3,q)-torus links.
description: 12 pages, 12 figures
Identifying macroscopic features in foreign visitor travel pathways
Creators: name: Kawamoto, Tatsuro
name: Hashimoto, Ryutaro
Publisher: name: arXiv
Year: 2020
Subjects: subject: Physics and Society (physics.soc-ph)
subject: FOS: Physical sciences

description: Human travel patterns are commonly studied as networks in which the points of departure and destination are encoded as nodes and the travel frequency between two points is recorded as a weighted edge. However, because travelers often visit multiple destinations, which constitute pathways, an analysis incorporating pathway statistics is expected to be more informative over an approach based solely on pairwise frequencies. Hence, in this study, we apply a higher-order network representation framework to identify characteristic travel patterns from foreign visitor pathways in Japan. We expect that the results herein are mainly useful for marketing research in the tourism industry.
description: 16 pages, 10 figures
Η Διατήρηση των Μεταναστευτικών Γλωσσών μέσα από τις Ιστοσελίδες Κοινωνικής Δικτύωσης: το Παράδειγμα της Αραβόφωνης και της Ρωσόφωνης Κοινότητας της Θεσσαλονίκης:
Creators: name: Καρυπίδου, Αικατερίνη Στυλιανού
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: Γλωσσική Διατήρηση
Ιστοσελίδες Κοινωνικής Δικτύωσης
Αραβόφωνη και Ρωσόφωνη Κοινότητα της Θεσσαλονίκης
Language Maintenance
Social Network Sites
Arab and Russian Speaking Communities of Thessaloniki

description: Σκοπός της διατριβής ήταν η διερεύνηση της γλωσσικής χρήσης σε ιστοσελίδες κοινωνικής δικτύωσης και ο ρόλος των τελευταίων στη γλωσσική διατήρηση των μητρικών γλωσσών της αραβόφωνης και της ρωσόφωνης κοινότητας της Θεσσαλονίκης. Διερευνήθηκαν, επιπλέον, ζητήματα όπως η διγλωσσία, οι παράγοντες που συμβάλλουν στη γλωσσική διατήρηση ή το γλωσσικό θάνατο, η μετάβαση στην ψηφιακή εποχή, το ψηφιακό χάσμα, ο λειτουργικός και ο ψηφιακός γραμματισμός. Επιπροσθέτως, εξετάστηκαν εφαρμογές και μέθοδοι που, σύμφωνα με νέες θεωρίες μάθησης, όπως ο Κονεκτιβισμός, μπορούν να οδηγήσουν στην παιδαγωγική αξιοποίηση των ιστοσελίδων κοινωνικής δικτύωσης μέσα στην πολυπολιτισμική τάξη. Τέλος, με τη μέθοδο του ερωτηματολογίου σε δείγμα 54 θεατών διερευνήθηκε ο ψηφιακός γραμματισμός και η γλωσσική χρήση, αλλά και η διαγενεαλογική διατήρηση των μητρικών γλωσσών της αραβόφωνης και ρωσόφωνης κοινότητας της Θεσσαλονίκης, κατά την περιήγηση στις ιστοσελίδες κοινωνικής δικτύωσης.
description: The purpose of this study was to investigate the language use in social networking sites and the role of SNS in the maintenance of mother tongues of the Arab-speaking and Russian-speaking community of Thessaloniki. In addition, we tried to investigate issues such as bilingualism, the factors that contribute to language maintenance or language death, the transition to the digital age, the digital divide, as well as the functional and digital literacy. Moreover, we tried to examine applications and tested methods, according to new theories of learning, such as Connectivism, and whether they can lead to the pedagogical use of social networking sites in the multicultural classroom. Finally, using the questionnaire in a sample of 54 viewers, we tried to investigate the digital literacy and language use, and the intergenerational preservation of mother tongue of the Arab-speaking and Russian-speaking community of Thessaloniki, while browsing social networking sites.
The impact of mergers on relaxed X-ray clusters - II. Effects on global X-ray and SZ properties and their scaling relations
Creators: name: Poole, Gregory B.
name: Babul, Arif
name: McCarthy, Ian G.
name: Fardal, Mark A.
name: Bildfell, C. J.
name: Quinn, Thomas
name: Mahdavi, Andisheh
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We use the suite of simulations presented in Poole et al (2006) to examine global X-ray and Sunyaev-Zel'dovich (SZ) observables for systems of merging relaxed X-ray clusters. In all of the scaling relations generated from the properties we have studied, we observe a generic evolution (in good qualitative agreement with previous authors): a rapid transient roughly along the mass scaling relations, a subsequent slow drift across the scatter until virialization, followed by a slow evolution along and up the mass scaling relations as cooling recovers in the cluster cores. However, this drift is not sufficient to account for the observed scatter in the scaling relations. We also study the effects of mergers on several theoretical temperature measures of the intracluster medium: emission weighted measures (T_ew), the spectroscopic-like measure proposed by Mazzotta et al (2004; T_sl) and plasma model fits to the integrated spectrum of the system (T_spec). We find that T_sl tracks T_spec for the entire duration of our mergers, illustrating that it remains a good tool for observational comparison even for highly disturbed systems. Furthermore, the transient temperature increases produced during first and second pericentric passage are 15-40% larger for T_ew than for T_sl or T_spec. This suggests that the effects of transient temperature increases on sigma_8 and Omega_M derived by Randall et al (2002) are over estimated. Lastly, we examine the X-ray SZ proxy proposed by Kravtsov et al (2006) and find that the tight mass scaling relation they predict remains secure through the entire duration of a merger event, independent of projection effects.
description: 24 pages, 14 figures, submitted for publication in MNRAS
Systemic Risk in Market Microstructure of Crude Oil and Gasoline Futures Prices: A Hawkes Flocking Model Approach
Creators: name: Jang, Hyun Jin
name: Lee, Kiseop
name: Lee, Kyungsub
Publisher: name: arXiv
Year: 2020
Subjects: subject: Trading and Market Microstructure (q-fin.TR)
subject: Risk Management (q-fin.RM)
subject: Statistical Finance (q-fin.ST)
subject: Applications (stat.AP)
subject: FOS: Economics and business
subject: FOS: Computer and information sciences

description: We propose the Hawkes flocking model that assesses systemic risk in high-frequency processes at the two perspectives -- endogeneity and interactivity. We examine the futures markets of WTI crude oil and gasoline for the past decade, and perform a comparative analysis with conditional value-at-risk as a benchmark measure. In terms of high-frequency structure, we derive the empirical findings. The endogenous systemic risk in WTI was significantly higher than that in gasoline, and the level at which gasoline affects WTI was constantly higher than in the opposite case. Moreover, although the relative influence's degree was asymmetric, its difference has gradually reduced.
An Alfvenic reconnecting plasmoid thruster
Creators: name: Ebrahimi, Fatima
Publisher: name: arXiv
Year: 2020
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: A new concept for generation of thrust for space propulsion is introduced. Energetic thrust is generated in the form of plasmoids (confined plasma in closed magnetic loops) when magnetic helicity (linked magnetic field lines) is injected into an annular channel. Using a novel configuration of static electric and magnetic fields, the concept utilizes a current-sheet instability to spontaneously and continuously create plasmoids via magnetic reconnection. The generated low-temperature plasma is simulated in a global annular geometry using the extended magnetohydrodynamic model. Because the system-size plasmoid is an Alfvenic outflow from the reconnection site, its thrust is proportional to the square of the magnetic field strength and does not ideally depend on the mass of the ion species of the plasma. Exhaust velocities in the range of 20 to 500 km/s, controllable by the coil currents, are observed in the simulations.
description: Accepted in Journal of Plasma Physics
Interazioni mediterranee in vista dell'incontro di Bari (19-23 febbraio 2020)
Creators: name: Taneburgo, Pier Giorgio
Publisher: name: Apulia Theologica
Year: 2025

description: Apulia Theologica, V. 6 N. 1 (2020): Apulia theologica vol. 6, fascicolo 1
МЕТОДЫ КОНСЕРВАТИВНОЙ ТЕРАПИИ У ПАЦИЕНТОВ С СИНДРОМОМ ГИПЕРАКТИВНОГО МОЧЕВОГО ПУЗЫРЯ
Creators: name: Эшонкулова, Файёза
name: Равшанова, Мохинур
name: Сувонкулова, Камола
name: Шавази, Н.Н.
Publisher: name: Zenodo
Year: 2024

description: Гиперактивный мочевой пузырь (ГМП) — это клинический синдром, включающий позывы к мочеиспусканию с ургентным недержанием мочи или без него, обычно в сочетании с частотой мочеиспускания и никтурией (мочеиспусканием между засыпанием и пробуждением). На сегодняшний день установлено, что причиной частого и ургентного мочеиспускания у большинства пациентов является гиперактивность детрузора. Проблема диагностики и успешного лечения пациентов с ГМП требует комплексного подхода с привлечением врачей различных специальностей, в первую очередь урологов, неврологов и нейрохирургов. Обращается внимание на то, что в большинстве случаев определить истинную причину развития ГМП не представляется возможным, что обуславливает необходимость продолжения исследований, направленных на выявление этиологических факторов ГМП002E
Discreteness of the spectrum of the Laplace-Beltrami operator
Creators: name: Harmer, M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Functional Analysis (math.FA)
subject: Differential Geometry (math.DG)
subject: FOS: Mathematics

description: We propose simple conditions equivalent to the discreteness of the spectrum of the Laplace-Beltrami operator on a class of Riemannian manifolds close to warped products. For this class of manifolds we establish a relationship between discreteness of the spectrum and stochastic incompleteness.
Η έννοια της πολιτικής και το ζήτημα της δημοκρατίας στα «Πολιτικά» του Αριστοτέλους:
Creators: name: Στογιώργης, Ιωάννης Παναγιώτη
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: Αριστοτέλης
Πολιτικά
Δημοκρατία
Aristotle
Politics
Democracy

description: Το παρόν πόνημα πραγματεύεται μέσα από διεξοδική εξέταση-ανάλυση δύο συγκεκριμένα ζητήματα των «Πολιτικών» του Αριστοτέλους, αυτά της έννοιας της πολιτικής, αλλά και της δημοκρατίας . Χωριζόμενη σε τρία θεματικά μέρη επιχειρεί να φέρει τον αναγνώστη σε γνωριμία με τον πολιτικό στοχασμό του Αριστοτέλη. Ξεκινώντας από μια σύντομη διέλευση μέσα από τις βασικές αρχές στις οποίες θεμελιώνεται το γενικότερο φιλοσοφικό σύστημα του φιλοσόφου, επιχειρείται η εξοικείωση του αναγνώστη με κεντρικές έννοιες της αριστοτελικής φιλοσοφίας. Το δεύτερο και κύριο θεματικό μέρος προβαίνει σε μια παρουσίαση των κεντρικών εννοιών της πολιτικής θεωρίας, όπως αυτή έχει αποτυπωθεί στα «Πολιτικά» του Αριστοτέλους, ακολουθώντας , όπου είναι δυνατόν, τη διάρθρωση του πρωτότυπου κειμένου. Στο τελευταίο και επιλογικό τμήμα γίνεται προσπάθεια ανάδειξης των προβληματισμών, που συχνά εγείρονται κατά την ανάγνωση του έργου ως προς τη έννοια της δημοκρατίας και το τρόπο με τον οποίο αυτή περιγράφεται - αναλύεται στα Πολιτικά.
description: This essay addresses within an in-depth-analysis two specific issues of Aristotle’s “Politics”, the concept of political, and democracy. Divided into three thematic sections attempts to bring the reader to rediscover the political thought of Aristotle. Starting from a brief passage through the basic principles underlying the philosopher’s overall philosophical system, attempts to familiarize the reader with key concepts of Aristotelian philosophy. The second and main section of the thesis makes a presentation of the fundamental concepts of political theory, as they are being reflected within the "Politics" of Aristotle, following ,wherever possible, the structure of the original text. The last and closing section attempts to highlight the concerns that often arise when reading the work as for the concept of democracy and how it was described and /or was discussed in the Politics.
Superhumps Behavior during Normal Outbursts in ER UMa: Spectroscopy and Photometry
Creators: name: Zhao, Yinghe
name: Li, Zongyun
name: Wu, Xiaoan
name: Peng, Qiuhe
name: Zhang, Zhousheng
name: Li, Zili
name: ;
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have taken a 4-day spectroscopic observation and have been conducting a 13-day photometric study of the SU UMa-type dwarf nova, ER Ursae Majoris. The mean $K$-amplitude for the emission lines is $54\pm 8$ km s$^{-1}$ and $γ$ velocity is 8$\pm 4$ km s$^{-1}$ from our spectroscopic results. A phase shift of 0.22 is also obtained. Our photometric observation confirms superhumps in normal outbursts of ER UMa and reconciles contradictory observational results obtained by different authors. We find that superhumps possibly develop near each normal outburst maximum and fade out before the next outburst maximum. If the observed humps were not late superhumps but ordinary superhumps, much more theoretical works should be done to explain the new phenomena.
description: 16 pages, 10 figures, accepted for publication in PASJ
MPEC 2024-T177 : 2024 TX4
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2024
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2024 TX4

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Optimal Throughput-Diversity-Delay Tradeoff in MIMO ARQ Block-Fading Channels
Creators: name: Chuang, Allen
name: Fabregas, Albert Guillen i
name: Rasmussen, Lars K.
name: Collings, Iain B.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: In this paper, we consider an automatic-repeat-request (ARQ) retransmission protocol signaling over a block-fading multiple-input, multiple-output (MIMO) channel. Unlike previous work, we allow for multiple fading blocks within each transmission (ARQ round), and we constrain the transmitter to fixed rate codes constructed over complex signal constellations. In particular, we examine the general case of average input-power-constrained constellations as well as the practically important case of finite discrete constellations. This scenario is a suitable model for practical wireless communications systems employing orthogonal frequency division multiplexing techniques over a MIMO ARQ channel. Two cases of fading dynamics are considered, namely short-term static fading where channel fading gains change randomly for each ARQ round, and long-term static fading where channel fading gains remain constant over all ARQ rounds pertaining to a given message. As our main result, we prove that for the block-fading MIMO ARQ channel with discrete input signal constellation satisfying a short-term power constraint, the optimal signal-to-noise ratio (SNR) exponent is given by a modified Singleton bound, relating all the system parameters. To demonstrate the practical significance of the theoretical analysis, we present numerical results showing that practical Singleton-bound-achieving maximum distance separable codes achieve the optimal SNR exponent.
description: 51 pages, 15 figures. Submitted to IEEE Transactions on Information Theory
Oscillations of red giant stars with magnetic damping in the core. I. Dissipation of mode energy in dipole-like magnetic fields
Creators: name: Müller, Jonas
name: Coppée, Quentin
name: Hekker, Saskia
Publisher: name: arXiv
Year: 2025
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Strong magnetic fields in the core of red-giant branch stars are expected to suppress the amplitudes of the multipole modes. This occurs when the strength of the internal magnetic field approaches the critical field strength, at which the magnetic forces become comparable to the buoyancy. We performed Hamiltonian ray tracing simulations of magneto-gravity waves to investigate the suppression of the multipole modes in the presence of an internal dipole-like magnetic field. We took into account different stellar masses, metallicities, and ages, as well as various oscillation frequencies and spherical degrees. In particular, we estimated the trapped fraction, a measure of multipole mode suppression, which quantifies the fraction of mode energy in the core that is dissipated by the interaction with the magnetic field. Our results indicate that the trapped fraction can be described by a simple expression, which smoothly connects the regime without multipole mode suppression with the regime with complete suppression of the multipole modes. Crucially, the trapped fraction depends only on the ratio between the strength of the internal magnetic field and the critical field strength. Therefore, our expression for the trapped fraction provides a flexible tool that can be used, for example, to estimate the amount of multipole mode suppression as a star ascends the red-giant branch or to investigate the onset of the suppression in observed power spectral densities.
description: accepted by A&A, 20 pages, 19 figures, 3 tables
The HIRN Resource Browser: Sharing and Enhancing Resources
Creators: name: Vu, Anh Nguyet
Publisher: name: Zenodo
Year: 2020
Subjects: FAIR
database

description: Abstract The HIRN Resource Browser platform was developed to curate and catalog all resources created by Human Islet Research Network (HIRN) investigators. Its design and accompanying methods promote Findable, Accessible, Interoperable, and Reusable (FAIR) principles. The FAIR guidelines are widely recognized principles that address data (and metadata) sharing and management best practices for scholarly resources. The Resource Browser improves available data annotation and enable more powerful data mining of research outputs. The platform also has potential to be extended with add-ons that help visualize and process data in response to new developments in the diabetes research community.
Leadership development of nurse managers in a Saudi hospital: a focused ethnographic study
Creators: name: Alenezi, Ibrahim
Publisher: name: The University of Edinburgh
Year: 2022
Subjects: Leadership development
nursing
nurse managers
CPD
CME
barriers
facilitators
organisational culture
focused ethnography

description: BACKGROUND: The Saudi Vision 2030 sets out the ambition of high-quality healthcare for all its citizens and residents. It requires nursing to be transformed to improve uptake, retention, and involvement of the workforce. Furthermore, all nurses should have a satisfying and rewarding professional career and develop their leadership roles. However, at present how nurse managers acquire and practise their leadership skills in the Ministry of Health hospitals in Saudi Arabia is unclear. AIM: To explore the perceptions and experiences of nurse managers regarding leadership development in a Saudi hospital affiliated with the Ministry of Health. Design and Methods: A focused ethnographic study was undertaken with multiple field visits (a total of eight months and seven days). Qualitative data collection involved observations of the workplace and Continuous Medical Education lectures, examination of relevant documents, informal interviews and discussions with five participants, and semi-structured interviews with 21 nurse managers. Framework analysis was used to identify common themes to provide a structured summary of the data. FINDINGS: Four main themes were identified. Firstly, imbalanced power dynamics were evident in the culturally pervasive and normalised capricious leadership approach. Workforce decisions were based on power in the absence of a clear hospital strategic vision and transparent human resource management processes, whereby decisions favoured some with financial rewards, favourable work assignments, meritless promotions, and arbitrary staffing allocations. Additionally, there was no shared vision shown by ineffective communication and a lack of job clarity. Workplace rituals and behaviours revealed a climate of bullying and punctuality issues. Gender segregation allowed female nurse managers to resist senior male managers and express their independent freedom of action. Finally, a need for learning was evident but was not clearly directed, with didactically delivered lectures providing a cost-effective way for the workforce to accumulate CME accreditation maintain their registration. CONCLUSION: Whilst hierarchical and transactional management structures and processes were found in line with Arabic culture, they did not explain the managers' leadership experiences framed by wasta, a form of cultural nepotism normal to Saudi business practice but which is now officially recognised and condemned as corrupt by state legislators. The climate of fear and intimidation created by managers induced compliance, conformity and adaption within directorate practices. Furthermore, gender separation allowed female staff to avoid male directorate authority. Keywords: Leadership development, nursing, nurse managers, CPD, CME, barriers, facilitators, organisational culture, focused ethnography.
The atmosphere of HD 209458b seen with ESPRESSO. No detectable planetary absorptions at high resolution
Creators: name: Casasayas-Barris, N.
name: Palle, E.
name: Stangret, M.
name: Bourrier, V
name: Tabernero, H. M.
name: Yan, F.
name: Borsa, F.
name: Allart, R.
name: Osorio, M. R. Zapatero
name: Lovis, C.
name: Sousa, S. G.
name: Chen, G.
name: Oshagh, M.
name: Santos, N. C.
name: Pepe, F.
name: Rebolo, R.
name: Molaro, P.
name: Cristiani, S.
name: Adibekyan, V.
name: Alibert, Y.
name: Prieto, C. Allende
name: Bouchy, F.
name: Demangeon, O. D. S.
name: Di Marcantonio, P.
name: Odorico, V. D
name: Ehrenreich, D.
name: Figueira, P.
name: Santos, R. Génova
name: Hernández, J. I. González
name: Lavie, B.
name: Lillo-Box, J.
name: Curto, G. Lo
name: Martins, C. J. A. P.
name: Mehner, A.
name: Micela, G.
name: Nunes, N. J.
name: Poretti, E.
name: Sozzetti, A.
name: Mascareño, A. Suárez
name: Udry, S.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We observed two transits of the iconic gas giant HD 209458b between 380 and 780 nm, using the high-resolution ESPRESSO spectrograph. The derived planetary transmission spectrum exhibits features at all wavelengths where the parent star shows strong absorption lines, for example, NaI, MgI, FeI, FeII, CaI, VI, H$α$, and KI. We interpreted these features as the signature of the deformation of the stellar line profiles due to the Rossiter-McLaughlin effect, combined with the centre-to-limb effects on the stellar surface, which is in agreement with similar reports recently presented in the literature. We also searched for species that might be present in the planetary atmosphere but not in the stellar spectra, such as TiO and VO, and obtained a negative result. Thus, we find no evidence of any planetary absorption, including previously reported NaI, in the atmosphere of HD 209458b. The high signal-to-noise ratio in the transmission spectrum allows us to compare the modelled deformation of the stellar lines in assuming different one-dimensional stellar atmospheric models. We conclude that the differences among various models and observations remain within the precision limits of the data. However, the transmission light curves are better explained when the centre-to-limb variation is not included in the computation and only the Rossiter-McLaughlin deformation is considered. This demonstrates that ESPRESSO is currently the best facility for spatially resolving the stellar surface spectrum in the optical range using transit observations and carrying out empirical validations of stellar models.
description: 21 pages, 19 figures. Accepted
Measuring social poverty for concrete regeneration of suburbs: the Neapolitan case of San Giovanni a Teduccio
Creators: name: Coppola, Emanuela
name: Sica, Giusy
Publisher: name: UPLanD - Journal of Urban Planning, Landscape & environmental Design
Year: 2023

description: This paper focusses on the 6th Municipality of Naples and in particular on the neighborhood "San Giovanni a Teduccio". We use quantitative indices to measure social disease and inequalities, as well as indices to describe the sociodemographic history of this neighborhood. Methodologically, we compare the values of few population-based and socio-demographic indices provided by the Italian National Institute of Statistics (ISTAT) for San Giovanni a Teduccio, for the entire Napolitan metropolitan area and, when available, of the entire Italy. The index of social disease (ISD) for San Giovanni a Teduccio in 2011 was 21.16%, one of the highest of the entire Italian territory. This demonstrates that the inhabitants were living in a really uncomfortable situation, specifically due to a high unemployment rate, especially affecting uneducated young people. This motivated and engaged the community, as well as the University of Naples Federico II, to undertake bottom-up territorial regeneration and social innovation actions, which are briefly described in the paper. Although the data and statistical analysis presented are far from being exhaustive and unfortunately cannot yet map the results of these actions, they highlight the need for a deep reflection. Hence in the conclusions, we invite to consider an approach which is much more people-oriented and starts from the bottom. In fact, concrete urban regeneration cannot be achieved without their social regeneration. Only real listening to the local community, the prefiguration of possible microactions of territorial regeneration but, above all, the activation of a shared and democratic decision-making process can lead to real territorial development.
description: UPLanD - Journal of Urban Planning, Landscape & environmental Design, Vol 7 No 2: Circular Communities
Giant Ly-alpha nebulae in the high redshift (z>2) Universe
Creators: name: Villar-Martin, Montse
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: High redshift radio galaxies (z>2) are believed to be progenitors of the giant ellipticals of today. They are often associated with giant Ly-alpha nebulae (sometimes >100 kpc), which have been for more than two decades valuable sources of information about the evolutionary status of the host galaxy and its chemical enrichment and star formation histories. I present in this paper a summary of the most relevant results about the giant nebulae obtained in the last ~10 years and the implications on our understanding of the early phases of evolution of massive elliptical galaxies.
description: Presented at the workshop on The Fate of the Gas in Galaxies, Dwingeloo, The Netherlands, July 2006. To appear in New Astronomy Reviews; 7 pages, 7 figures
Spectroscopic analysis of the bulge Globular Cluster ESO~456-SC38
Creators: name: Kunder, Andrea
name: Butler, Evan
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: It has been suggested that the oldest stellar populations in the Milky Way Galaxy are tightly bound and confined to the central regions of the Galaxy. This is one of the reasons why a handful of globular clusters located in the bulge region are thought to be remnants of the primeval formation stages of the Milky Way. The globular cluster, ESO 456-SC38 (Djorgovski~2) is one such cluster; it has a blue horizontal branch, is projected very close to the center of the Galaxy, and has an orbit confining it to the bulge/bar region. The first alpha abundances of seven stars in this heavily reddened cluster are presented using APOGEE DR16. A significant spread in the abundances of N, C, Na, and Al indicates the presence of multiple stellar populations in this cluster. Using Gaia DR2 proper motions and radial velocities from BRAVA-RR, we confirm RR Lyrae stars belong to this globular cluster.
description: accepted to The Astronomical Journal
Η Ακολουθία των Μεγάλων Ωρών και του Εσπερινού της Μεγάλης Παρασκευής στην Βυζαντινή Μελοποιία:
Creators: name: Σπανουδάκης, Δημοσθένης Πέτρου
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: Μεγάλη Παρασκευή
Βυζαντινή Μουσικολογία
Μικρο-αναγωγική μουσικολογική ανάλυση
Great Friday
Byzantine Musicology
Micro-reductive musicological analysis

description: Σκοπός της μεταπτυχιακής εργασίας ήταν η προσέγγιση της Ακολουθίας των Μεγάλων Ωρών και του Εσπερινού της Μεγάλης Παρασκευής στην Βυζαντινή Μελοποιία. Στο πρώτο μέρος μελετήθηκαν τα περιεχόμενα και η εξέλιξη των δύο Ακολουθιών ενώ έγινε και μία Θεολογική-πνευματική προσέγγιση των υμνογραφικών κειμένων των τροπαρίων που ψάλλονται σε αυτές τις δύο Ακολουθίες. Στο δεύτερο μέρος περιλήφθηκε μία μουσικολογική προσέγγιση τριών Στιχηρών Δοξαστικών: Τοις συλλαβούσι σε παρανόμοις..., Σήμερον κρεμάται επί ξύλου..., και Σε τον αναβαλλόμενον.... Αυτά τα τροπάρια Βυζαντινής Μουσικής εξετάστηκαν από έξι διαφορετικές πηγές: τρία χειρόγραφα με παλαιά Μεσο-βυζαντινή σημειογραφία (μέσα 15ου, αρχές 18ου και τέλη 18ου αι.), και τις αντίστοιχες πηγές που περιλαμβάνουν τις εξηγήσεις αυτών των χειρογράφων σε Νέο-βυζαντινή σημειογραφία (αρχές 19ου αι.) από τους Τρείς Διδασκάλους και κυρίως τον Χουρμούζιο Χαρτοφύλακα. Επιπλέον, έγινε μία μουσικολογική μικρο-αναγωγική ανάλυση αυτών των Στιχηρών Δοξαστικών με επίκεντρο του φθόγγους μετροφωνικής δομής από τα χειρόγραφα με παλαιά γραφή και τους φθόγγους του μέλους της εξήγησης. Τέλος, στο τρίτο μέρος έγινε μία μελέτη-καταγραφή των περιεχομένων του Τριωδίου από τα χειρόγραφα Διονυσίου 564 (μέσα 15ου αι.) και Ambrosianus A 139 (μέσα 14ου αι.).
description: The aim of the present Diploma work was the approach of the Great Hours and Vesper of the Great Friday in the Byzantine Music. In the first part, the content and the development of these two Services were examined. Additionally, the hymnographic text of the chants of these Services was Theologically examined. In the second part, there is a musicological approach of three Doxastika Stichera: Τοις συλλαβούσι σε παρανόμοις..., Σήμερον κρεμάται επί ξύλου..., και Σε τον αναβαλλόμενον... These chants were examined from six different sources: three manuscripts neumated with Middle-byzantine notation (middle of 15th, early18th and late 18th cent.) and their corresponding exegeseis - musical interpretations in New-byzantine notation (early 19th cent.) from the Three Teachers and mainly from Chourmouzios Chartofylax. Additionally, there is a musicological micro-reductive analysis for these three Stichera, focusing on the notes of the metrophonic structure from the manuscripts with the old notation and the notes from the melody of the exegesis. Finally, in the third part, the context of two manuscripts: Sticherarion Dionysiou 564 (middle of 15th cent.) and Sticherarion Ambrosianus A 139 (middle of 14th cent.) was examined for the Triodion period.
The landscape of atypical and eukaryotic protein kinases
Creators: name: Kanev, Georgi
name: Kooistra, Albert
name: Graaf, Chris De
name: Esch, Iwan De
name: Leurs, Rob
name: Würdinger, Thomas
name: Westerman, Bart
Publisher: name: F1000 Research Limited
Year: 2019

description: We have performed comprehensive sequence, structural, mutational and inhibitor binding analysis of protein kinases and developed a structure-based virtual screening pipeline that uses 1D and 3D (structural) kinase-ligand information as input for deep convolutional neural networks (CNN) to predict the activity of small molecules against the kinome. Our integrated structural, genetic and activity data, available at the KLIFS database (http://klifs.vu-compmedchem.nl), provides a framework for the design and repurposing of protein kinase inhibitors as well as strategies to refine next generation personalized medicine.