cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Not gone with the Wind: Survival of High-Velocity Molecular Clouds in the Galactic center
Creators: name: Zhang, Mengfei
name: Li, Miao
Publisher: name: arXiv
Year: 2023
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: High-velocity atomic clouds in the Galactic center have attracted significant attention due to their enigmatic formation process, which is potentially linked to the starburst or supermassive black hole activities in the region. Further, the discovery of high-velocity molecular clouds (HVMCs) presents a greater puzzle, because they are much denser and more massive. If the HVMCs were accelerated by the strong activities in the Galactic center, they are expected to be destroyed before they reach such a high velocity. To shed light on this phenomenon, we perform three-dimensional numerical simulations to investigate the origin and hydrodynamic evolution of HVMCs during a starburst in the Galactic center. We find that the presence of a magnetic field provides effective protection and acceleration to molecular clouds (MCs) within the galactic winds. Consequently, the MCs can attain latitudes of approximately 1 kpc with velocities around 200 km/s, consistent with the observed characteristics of HVMCs. The consistency of our findings across a wide parameter space supports the conclusion that HVMCs can indeed withstand the starburst environment in the Galactic center, providing valuable insights into their survival mechanisms.
description: 18 pages, 16 figures, submitted to MNRAS
Measurement of the in-medium K0 inclusive cross section in pi- -induced reactions at 1.15 GeV/c
Creators: name: Benabderrahmane, M. L.
name: Herrmann, N.
name: Wisniewski, K.
name: Kecskemeti, J.
name: Andronic, A.
name: Barret, V.
name: Basrak, Z.
name: Bastid, N.
name: Buehler, P.
name: Cargnelli, M.
name: Caplar, R.
name: Cordier, E.
name: Deppner, I.
name: Crochet, P.
name: Dupieux, P.
name: Dzelalija, M.
name: Fabbietti, L.
name: Fodor, Z.
name: Gasik, P.
name: Gasparic, I.
name: Grishkin, Y.
name: Hartmann, O. N.
name: Hildenbrand, K. D.
name: Hong, B.
name: Kang, T. I.
name: Kienle, P.
name: Kirejczyk, M.
name: Kim, Y. J.
name: Kis, M.
name: Koczon, P.
name: Korolija, M.
name: Kotte, R.
name: Lebedev, A.
name: Leifels, Y.
name: Lopez, X.
name: Manko, V.
name: Marton, J.
name: Mangiarotti, A.
name: Merschmeyer, M.
name: Matulewicz, T.
name: Petrovici, M.
name: Piasecki, K.
name: Rami, F.
name: Reischl, A.
name: Reisdorf, W.
name: Ryu, M. S.
name: Schmidt, P.
name: Schuttauf, A.
name: Seres, Z.
name: Sikora, B.
name: Sim, K. S.
name: Simion, V.
name: Siwek-Wilczynska, K.
name: Smolyankin, V.
name: Suzuki, K.
name: Tyminski, Z.
name: Widmann, E.
name: Xiao, Z. G.
name: Yamazaki, T.
name: Yushmanov, I.
name: Zhang, X. Y.
name: Zhilin, A.
name: Zmeskal, J.
name: Bratkovskaya, E.
name: Cassing, W.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The K0 meson production by pi- mesons of 1.15 GeV/c momentum on C, Al, Cu, Sn and Pb nuclear targets was measured with the FOPI spectrometer at the SIS accelerator of GSI. Inclusive production cross-sections and the momentum distributions of K0 mesons are compared to scaled elementary production cross-sections and to predictions of theoretical models describing the in-medium production of kaons. The data represent a new reference for those models, which are widely used for interpretation of the strangeness-production in heavy-ion collisions. The presented results demonstrate the sensitivity of the kaon production to the reaction amplitudes inside nuclei and point to the existence of a repulsive KN-potential of 20+-5 MeV at normal nuclear matter density.
description: 4 pages, 3 figures. References corrected. Minor corrections in text and author list. Figure 3 corrected. Corrections in body and abstract after comments from the referees
ArCEs. Archivio digitale della cartografia e delle esplorazioni nei territori delle ex-colonie italiane
Creators: name: Azzari, Margherita
name: Calloud, Irene
name: Zamperlin, Paola
Publisher: name: Semestrale di studi e ricerche di geografia
Year: 2017

description: The project is a study for developing a digital archive about Italian scientific expeditions in Northern and Eastern Africa and the former Italian colonies (19th-20th century). The aim of the project is to assess, protect and enhance an important corpus of documents (historical cartographies, photographs, scientific papers and archive documents) distributed in public archives and private collections. The database structure is based on Dublin Core metadata standard. The information system is designed to integrate and make interoperable digital resources, to ensure standardized and complex indexing, to support advanced retrieval, according to the standards in use. The geolocation of the resources in a GIS environment can display query results in Google Maps environment.

Le but du projet Arces est le développement d’une archive numérique
pour le recensement, la protection et la valorisation d’une diversifiée
patrimoine cartographique et photographique sur les expéditions scientifiques dans les colonies italiennes (XIX-XX siècles). Le système d’information est conçu pour intégrer et rendre interopérables les ressources numériques, de soutien des relations articulées entre les ressources et pour assurer l’indexation normalisée et complexes, selon les normes en usage. La structure de la base du projet Arces est basé sur le standard de métadonnées Dublin Core. La géolocalisation des ressources et l’acquisition de thèmes vectoriels permettent d’obtenir les résultats thématiques de la requête dans Google Maps.
description: Semestrale di studi e ricerche di geografia, N. 1 (2011): La costruzione delle biografie territoriali: archivi e rappresentazione a cura di Marco Maggioli
Parole e luoghi in transito: l’Italia delle culture migranti
Creators: name: Ferrari, Valentina
Publisher: name: Semestrale di studi e ricerche di geografia
Year: 2017

description: L'articolazione della società contemporanea, multietnica e multiculturale,
genera nuove dinamiche sociali e geografiche. In tale contesto
alcuni scrittori stranieri hanno deciso di adottare la lingua italiana
nelle loro opere. La letteratura migrante, costituita dagli scritti in italiano di autori stranieri immigrati nel nostro Paese, rappresenta un nuovo mondo letterario che spesso mette al centro dellosservazione lesperienza migratoria. I testi della letteratura delle migrazioni costituiscono un arricchimento per il nostro contesto culturale, generano implicazioni sul territorio e sopratutto permettono di considerare la diversità come unopportunità e di riflettere sul ruolo dei migranti nellevoluzione della società italiana.
description: Semestrale di studi e ricerche di geografia, N. 1 (2011): La costruzione delle biografie territoriali: archivi e rappresentazione a cura di Marco Maggioli
Quantum control of the hyperfine-coupled electron and nuclear spins in alkali atoms
Creators: name: Merkel, Seth T.
name: Jessen, Poul S.
name: Deutsch, Ivan H.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study quantum control of the full hyperfine manifold in the ground-electronic state of alkali atoms based on applied radio frequency and microwave fields. Such interactions should allow essentially decoherence-free dynamics and the application of techniques for robust control developed for NMR spectroscopy. We establish the conditions under which the system is controllable in the sense that one can generate an arbitrary unitary on the system. We apply this to the case of $^{133}$Cs with its $d=16$ dimensional Hilbert space of magnetic sublevels in the $6S_{1/2}$ state, and design control waveforms that generate an arbitrary target state from an initial fiducial state. We develop a generalized Wigner function representation for this space consisting of the direct sum of two irreducible representation of SU(2), allowing us to visualize these states. The performance of different control scenarios is evaluated based on the ability to generate high-fidelity operation in an allotted time with the available resources. We find good operating points commensurate with modest laboratory requirements.
description: 14 pages, 7 figures; corrected typos
The Well di R. Barbieri e R. Russo 55 min.
Creators: name: Ricci, Alessandro
Publisher: name: Semestrale di studi e ricerche di geografia
Year: 2017

description: Siamo nellEtiopia meridionale, tra la tribù Borana dellOromia, lontana anni luce dalla civiltà e dalle comodità del mondo civilizzato, occidentale. Siamo nella primordialità della vita vissuta tra gli elementi essenziali, nella semplicità di una natura che ancora conserva i caratteri suoi propri, e con cui luomo stabilisce un contatto diretto e non mediato, senza vincoli tecnici o tecnologici. In questo contesto, luomo si ciba dei prodotti del suo lavoro, realizzato nei campi e attraverso la pastorizia, in un ciclo di vita che si rinnova stagionalmente e che, nel suo immutabile corso, reitera una relazione intensa tra uomo e natura, ricordando al primo come sia primario, essenziale e vitale il rapporto con la seconda.
description: Semestrale di studi e ricerche di geografia, N. 1 (2011): La costruzione delle biografie territoriali: archivi e rappresentazione a cura di Marco Maggioli
Proton and deuteron mass radii from near-threshold $ϕ$-meson photoproduction
Creators: name: Wang, Rong
name: Kou, Wei
name: Han, Chengdong
name: Evslin, Jarah
name: Chen, Xurong
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We analyze the exclusive $ϕ$-meson photoproduction on both hydrogen and deuterium targets based on the published data of CLAS, SAPHIR and LEPS collaborations. A dipole-form scalar gravitational form factor is applied to describe the $|t|$-dependence of the differential cross section. Based on the average of all the near-threshold data from CLAS, SAPHIR and LEPS, we find that the proton and deuteron mass radii are $0.75 \pm 0.02$ fm and $1.95 \pm 0.19$ fm respectively. The coherent and near-threshold quarkonium photoproduction seems to be sensitive to the radius of the hadronic system. The vector-meson-dominance model together with a low-energy QCD theorem well describe the data of near-threshold $ϕ$ photoproduction on the hadronic systems.
description: 6 pages, 6 figures
Statistical Model of Heavy-Ion Fusion-Fission Reactions
Creators: name: Lestone, J. P.
name: McCalla, S. G.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Cross-section and neutron-emission data from heavy-ion fusion-fission reactions are consistent with the fission of fully equilibrated systems with fission lifetime estimates obtained via a Kramers-modified statistical model which takes into account the collective motion of the system about the ground state, the temperature dependence of the location and height of fission transition points, and the orientation degree of freedom. If the standard techniques for calculating fission lifetimes are used, then the calculated excitation-energy dependence of fission lifetimes is incorrect. We see no evidence to suggest that the nuclear viscosity has a temperature dependence. The strong increase in the nuclear viscosity above a temperature of approximately 1.3 MeV deduced by others is an artifact generated by an inadequate fission model.
description: Full paper submitted to PRC to accompany our recently published Phys. Rev. Lett. 101, 032702 (2008)
What You Don't Know Can Hurt You: Use and Abuse of Astrophysical Models in Gravitational-wave Population Analyses
Creators: name: Cheng, April Qiu
name: Zevin, Michael
name: Vitale, Salvatore
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: One of the goals of gravitational-wave astrophysics is to infer the number and properties of the formation channels of binary black holes (BBHs); to do so, one must be able to connect various models with the data. We explore benefits and potential issues with analyses using models informed by population synthesis. We consider 5 possible formation channels of BBHs, as in Zevin et al. (2021b). First, we confirm with the GWTC-3 catalog what Zevin et al. (2021b) found in the GWTC-2 catalog, i.e. that the data are not consistent with the totality of observed BBHs forming in any single channel. Next, using simulated detections, we show that the uncertainties in the estimation of the branching ratios can shrink by up to a factor of $\sim 1.7$ as the catalog size increases from $50$ to $250$, within the expected number of BBH detections in LIGO-Virgo-KAGRA's fourth observing run. Finally, we show that this type of analysis is prone to significant biases. By simulating universes where all sources originate from a single channel, we show that the influence of the Bayesian prior can make it challenging to conclude that one channel produces all signals. Furthermore, by simulating universes where all 5 channels contribute but only a subset of channels are used in the analysis, we show that biases in the branching ratios can be as large as $\sim 50\%$ with $250$ detections. This suggests that caution should be used when interpreting the results of analyses based on strongly modeled astrophysical sub-populations.
description: 24 pages, 14 figures, comments are welcome
Electronic Supplementary Material from Male-like female morphs in hummingbirds: the evolution of a widespread sex-limited plumage polymorphism
Creators: name: Diamant, Eleanor S.
name: Falk, Jay J.
name: Rubenstein, Dustin R.
Publisher: name: The Royal Society
Year: 2021
Subjects: subject: Evolutionary Biology
subject: FOS: Biological sciences

description: ESM Text S1-S9, Tables S1-S2, Figures S1-S16
Transport properties in gapped graphene through magnetic barrier in a laser field
Creators: name: Aitouni, Rachid El
name: Mekkaoui, Miloud
name: Jellal, Ahmed
name: Schreiber, Michael
Publisher: name: arXiv
Year: 2023
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We study the transport properties of Dirac fermions through gapped graphene through a magnetic barrier irradiated by a laser field oscillating in time. We use Floquet theory and the solution of Weber's differential equation to determine the energy spectrum corresponding to the three regions composing the system. The boundary conditions and the transfer matrix approach {are} employed to explicitly determine the transmission probabilities for multi-energy bands and the associated conductance. As an illustration, we focus only on the three first bands: the central band $T_0$ (zero photon exchange) and the two first side bands $T_{\pm1}$ (photon emission or absorption). It is found that the laser field activates the process of translation through photon exchange. Furthermore, we show that varying the incident angle and energy gap strongly affects the transmission process. The conductance increases when the number of electrons that cross the barrier increases, namely when there is a significant transmission.
description: 12 pages, 7 figures. Clarifications added
Enriching volunteer clouds with self-* capabilities
Creators: name: Sebastio, Stefano
Publisher: name: IMT Alti Studi Lucca
Year: 2014
Subjects: QA75 Electronic computers. Computer science

description: Provisioning, using and maintaing computational resources as services is a hard challenge. On the one hand there is an
increasing demand of such services due to the increasing role of software in our society, while on the other hand the amount and variety computational resources
is growing due to the pervasiveness of computational devices in our lives. The complexity of such problem can only be mastered by resorting to suitable
technologies based on well-studied paradigms. Three prominent examples and ICT trends of the last decade are (i) cloud computing, which promotes the idea of
computational resources as services; (ii) autonomic computing, which aims at minimizing the amount of human intervention and automatizing many aspects of a
system’s life-cycle; and (iii) volunteer computing, which promotes the idea of achieving complex tasks by fostering the collaboration among peers. This thesis
proposes an approach based on the combination of the above mentioned paradigms (i)–(iii) for the design and evaluation of volunteer cloud platforms providing
a service for executing simple tasks. The major problem under consideration is the selection of the mechanisms used by cloud participants to collaborate for
providing such service. The main contributions of the thesis are: (1) an architecture and a model for volunteer cloud platforms; (2) a discrete event
simulator for such model; (3) the extension of a statistical analysis tool to ease the analysis; (4) novel self-* strategies for collaboration among volunteers,
mainly inspired by multi-agent systems and AI techniques, evaluated with the simulator using the Google Backend workload.
Un ricordo di Vittorio De Seta
Creators: name: Ricci, Antonello
Publisher: name: Semestrale di studi e ricerche di geografia
Year: 2017

description: Ho conosciuto Vittorio De Seta alla fine degli anni 80 dello scorso secolo.
Insieme a Roberta Tucci avevo realizzato una serie di ricerche e di registrazioni sulla musica tradizionale della Calabria e dopo aver
visto alcuni film sul blues, tra cui il bellissimo Mississippi blues di Robert
Parrish e Bertrand Tavernier, stavo seguendo lidea di realizzare qualcosa di simile sul territorio calabrese, associando due strade musicali la Highway 61 del Mississippi con la Strada Statale 106 della costa ionica. Così, un giorno di fine estate del 1988 dopo varie telefonate, siamo andati, Roberta e io, a Sellia Marina (CZ) dove De Seta, da tempo, aveva stabilito di abitare in una bella casa proprio lungo la Strada Statale 106, al centro di un vasto uliveto.
description: Semestrale di studi e ricerche di geografia, N. 1 (2011): La costruzione delle biografie territoriali: archivi e rappresentazione a cura di Marco Maggioli
Grammoptera subargentata
Creators: name: Webster, Reginald
name: McCoqrquodale, David
name: Majka, Christopher
Publisher: name: Zenodo
Year: 2009
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Cerambycidae
Grammoptera
Grammoptera subargentata

description: Grammoptera subargentata (Kirby, 1837) Nova Scotia: Cumberland Co., Malagash Station, 13.VII.2000, J. Ogden, sweep of woodland road (1, NSNR); Guysborough Co., Bonnet Lake Barrens, 17–24.V.1999, R. F. Lauff (1, STFX); Kings Co., Coldbrook, 6.VI.1968, on Crataegus, 466, D. Webster (1, DWC).
description: Published as part of Webster, Reginald, McCoqrquodale, David & Majka, Christopher, 2009, New records of Cerambycidae (Coleoptera) for New Brunswick, Nova Scotia, and Prince Edward Island, Canada, pp. 285-308 in ZooKeys 22 (22) on page 294, DOI: 10.3897/zookeys.22.122, http://zenodo.org/record/576540
Towards a realistic track reconstruction algorithm based on graph neural networks for the HL-LHC
Creators: name: Biscarat, Catherine
name: Caillou, Sylvain
name: Rougier, Charline
name: Stark, Jan
name: Zahreddine, Jad
Publisher: name: arXiv
Year: 2021
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: High Energy Physics - Experiment (hep-ex)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Physical sciences

description: The physics reach of the HL-LHC will be limited by how efficiently the experiments can use the available computing resources, i.e. affordable software and computing are essential. The development of novel methods for charged particle reconstruction at the HL-LHC incorporating machine learning techniques or based entirely on machine learning is a vibrant area of research. In the past two years, algorithms for track pattern recognition based on graph neural networks (GNNs) have emerged as a particularly promising approach. Previous work mainly aimed at establishing proof of principle. In the present document we describe new algorithms that can handle complex realistic detectors. The new algorithms are implemented in ACTS, a common framework for tracking software. This work aims at implementing a realistic GNN-based algorithm that can be deployed in an HL-LHC experiment.
description: Paper submitted to vCHEP2021 (25th International Conference on Computing in High-Energy Physics and Nuclear Physics), 10 pages, 4 figures
Milankovitch Cycles for a Circumstellar Earth-analog within $α$ Centauri-like Binaries
Creators: name: Quarles, Billy
name: Li, Gongjie
name: Lissauer, Jack J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: An Earth-analog orbiting within the habitable zone of $α$ Centauri B was shown to undergo large variations in its obliquity, or axial tilt, which affects the planetary climate by altering the radiative flux for a given latitude. We examine the potential implications of these obliquity variations for climate through Milankovitch cycles using an energy balance model with ice sheets. Similar to previous studies, the largest amplitude obliquity variations from spin-orbit resonances induce snowball states within the habitable zone, while moderate variations can allow for persistent ice caps or an ice belt. Particular outcomes for the global ice distribution can depend on the planetary orbit, obliquity, spin precession, binary orbit, and which star the Earth-analog orbits. An Earth-analog with an inclined orbits relative to the binary orbit can periodically transition through several global ice distribution states and risk runaway glaciation when periods of ice caps and an ice belt overlap. When determining the potential habitability for planets in stellar binaries, more care must be taken due to the orbital and spin dynamics.
description: 25 pages, 16 figures, 1 table; fixed missing reference; accepted for publication in MNRAS; public repository at https://github.com/saturnaxis/Ice-ages-in-AlphaCen
Asymmetric Rydberg blockade of giant excitons in cuprous oxide
Creators: name: Heckötter, Julian
name: Walther, Valentin
name: Scheel, Stefan
name: Bayer, Manfred
name: Pohl, Thomas
name: Aßmann, Marc
Publisher: name: TU Dortmund
Year: 2021
Subjects: subject: Electronic properties and materials
subject: Semiconductors
subject: 530

description: The ability to generate and control strong long-range interactions via highly excited electronic states has been the foundation for recent breakthroughs in a host of areas, from atomic and molecular physics to quantum optics and technology. Rydberg excitons provide a promising solid-state realization of such highly excited states, for which record-breaking orbital sizes of up to a micrometer have indeed been observed in cuprous oxide semiconductors. Here, we demonstrate the generation and control of strong exciton interactions in this material by optically producing two distinct quantum states of Rydberg excitons. This is made possible by two-color pump-probe experiments that allow for a detailed probing of the interactions. Our experiments reveal the emergence of strong spatial correlations and an inter-state Rydberg blockade that extends over remarkably large distances of several micrometers. The generated many-body states of semiconductor excitons exhibit universal properties that only depend on the shape of the interaction potential and yield clear evidence for its vastly extended-range and power-law character.
description: Nature Communications;12
Magnetic reconnection during collisionless, stressed, X-point collapse using Particle-in-Cell simulation
Creators: name: Tsiklauri, D.
name: Haruki, T.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: Plasma Physics (physics.plasm-ph)
subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: Two cases of weakly and strongly stressed X-point collapse were considered. Here descriptors weakly and strongly refer to 20 % and 124 % unidirectional spatial compression of the X-point, respectively. In the weakly stressed case, the reconnection rate, defined as the out-of-plane electric field in the X-point (the magnetic null) normalised by the product of external magnetic field and Alfvén speeds, peaks at 0.11, with its average over 1.25 Alfvén times being 0.04. Electron energy distribution in the current sheet, at the high energy end of the spectrum, shows a power law distribution with the index varying in time, attaining a maximal value of -4.1 at the final simulation time step (1.25 Alfvén times). In the strongly stressed case, magnetic reconnection peak occurs 3.4 times faster and is more efficient. The peak reconnection rate now attains value 2.5, with the average reconnection rate over 1.25 Alfvén times being 0.5. The power law energy spectrum for the electrons in the current sheet attains now a steeper index of -5.5, a value close to the ones observed in the vicinity of X-type region in the Earth's magneto-tail. Within about one Alfvén time, 2% and 20% of the initial magnteic energy is converted into heat and accelerated particle energy in the case of weak and strong stress, respectively. In the both cases, during the peak of the reconnection, the quadruple out-of-plane magnetic field is generated, hinting possibly to the Hall regime of the reconnection. These results strongly suggest the importance of the collionless, stressed X-point collapse as a possible contributing factor to the solution of the solar coronal heating problem or more generally, as an efficient mechanism of converting magnetic energy into heat and super-thermal particle energy.
description: Final Accepted Version (Physics of Plasmas in Press 2007)
Efficient Bayesian estimation of permutation entropy with Dirichlet priors
Creators: name: Little, Douglas J.
name: Toomey, Joshua P.
name: Kane, Deb M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: Chaotic Dynamics (nlin.CD)
subject: Optics (physics.optics)
subject: FOS: Physical sciences
subject: 37A35 (primary) 92F15, 37N20 (secondary)

description: Estimation of permutation entropy (PE) using Bayesian statistical methods is presented for systems where the ordinal pattern sampling follows an independent, multinomial distribution. It is demonstrated that the PE posterior distribution is closely approximated by a standard Beta distribution, whose hyperparameters can be estimated directly from moments computed analytically from observed ordinal pattern counts. Equivalence with expressions derived previously using frequentist methods is also demonstrated. Because Bayesian estimation of PE naturally incorporates uncertainty and prior information, the orthodox requirement that $N \gg D!$ is effectively circumvented, allowing PE to be estimated even for very short time series. Self-similarity tests on PE posterior distributions computed for a semiconductor laser with optical feedback (SLWOF) system show its PE to vary periodically over time.
description: 9 pages, 4 figures
Constructing Maximal Extensions of the Vaidya Metric in Israel Coordinates: I. Integration of the Field Equations
Creators: name: Nasereldin, Sheref
name: Lake, Kayll
Publisher: name: arXiv
Year: 2023
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: This paper explores a complete representation of the Vaidya model, a radial flux of radiation in the eikonal approximation, used for modeling various phenomena in both classical and semi-classical General Relativity and Astrophysics. The majority of the applications of the Vaidya model have been formulated in an incomplete representation. A complete representation is obtained here by direct integration of the Einstein field equations. We present the methodology to obtain this complete representation, and its utility in the modeling of general relativistic phenomena.
description: 8 pages, 1 figure, 2 tables
title: Ο ρόλος του σχολικού ηγέτη στην παρακίνηση των αναπληρωτών εκπαιδευτικών Α/βάθμιας εκπαίδευσης και η επαγγελματική τους ικανοποίηση
title: The role of the school leader in motivating substitute teachers of primary education and their professional satisfaction
titleType: AlternativeTitle
Creators: name: Νικολακέα, Ανδρομάχη
Publisher: name: Πανεπιστήμιο Πειραιώς
Year: 2021
Subjects: subject: Σχολικός ηγέτης
subject: Εκπαιδευτική διοίκηση - ηγεσία
subject: Παρακίνηση
subject: Επαγγελματική ικανοποίηση

description: Η ραγδαία ανάπτυξη των σύγχρονων κοινωνιών και οι αυξανόμενες απαιτήσεις που ακολουθούν, απαιτούν την αδιάκοπη βελτιστοποίηση της ποιότητας της παρεχόμενης εκπαίδευσης. Προς αυτήν την κατεύθυνση, έχει αποδειχθεί ότι κατέχουν σημαντικό ρόλο η παρακίνηση του ανθρώπινου δυναμικού και η ικανοποίηση που προκύπτει από τον χώρο εργασίας. Η παρακίνηση και η επαγγελματική ικανοποίηση είναι δύο έννοιες που απασχολούν τον τομέα της βιομηχανικής και οργανωσιακής ψυχολογίας εδώ και πάρα πολλές δεκαετίες. Παρόλο που έ-χουν αποτελέσει ένα προσφιλές αντικείμενο διερεύνησης από τους μελετητές, διαπιστώνεται μια ανάγκη για περεταίρω έρευνα στο ελληνικό εκπαιδευτικό σύστημα. Σκοπός της παρούσας έρευνας είναι να διερευνήσει το επίπεδο της παρακίνησης των αναπληρωτών εκπαιδευτικών που δουλεύουν στην πρωτοβάθμια εκπαίδευση, από τον διευθυντή της σχολικής μονάδας και κατά πόσο αντλούν ικανοποίηση από τον χώρο της εργασίας τους, δεδομένων των δυσκολιών που αντιμετωπίζουν. Το δείγμα της έρευνας αποτελείται από 104 εκπαιδευτικούς, ως ερευνητικό εργαλείο χρησιμοποιήθηκε το ερωτηματολόγιο το οποίο περιείχε ερωτήσεις κλειστού τύπου.
Le catene globali del valore del settore tessile-abbigliamento: l’eccellenza europea nel confronto con il predominio asiatico
Creators: name: Simonetti, Lucia
Publisher: name: Semestrale di studi e ricerche di geografia
Year: 2016

description: The textile and apparel value chain: the European excellence vis-à-vis the Asiatic predominance
Since 2005, after more than forty years of import quotas, the textile and clothing sector has become subject to the general rules of the General Agreement on Tariffs and Trade. The liberalization caused a great shift in the global geography of textile and apparel production and trade, and a strong restructuring of firm strategies.
China has been the big winner, becoming the world’s largest exporter, but other
emerging suppliers (Bangladesh, Vietnam, Cambodia) are recently expanding their roles. This paper analyze the possible landscape for the global textile and apparel industry in the future, exploring the various drivers of change that are influencing and shaping the sector (as the increase in size of population and increase of middle class size in developing nations, the rising of living standard in previous low wage supplying countries, the concern for sustainibility and for a growing trasparency in the supply chain). If present trends will be reinforced, the EU will strengthen its technological lead, mainly serving the upper end of markets and focusing on innovation, quality and design, while emerging countries will improve their specialisation in mass and medium quality production.

La chaine de valeur du sector textile-habillement, l’excellence europeénne comparée avec la dominance asiatique
De 2005, après plus de quarante ans de contingents d’importation, le secteur textile et de l’habillement est devenu soumis aux règles générales de l’Accord général sur les tarifs douaniers et le commerce. La libéralisation a provoqué un grand changement dans la géographie mondiale du secteur, et une forte restructuration des stratégies des firmes. La Chine a été le grand gagnant, devenant le plus grand exportateur du monde, mais d’autres fournisseurs émergents (comme le Bangladesh, le Vietnam, ou la Cambodge) ont récemment renforcé leur rôle. Ce document analyse le paysage
probable pour l’industrie textile et de l’habillement, exploting les différents facteurs de changement qui influencent le secteur (comme l’augmentation de la taille de la population et de la classe moyenne dans les pays en développement, la montée du niveau de vie dans les pays a bas salaires, le souci de la durabilité et de la trasparency croissante dans la chaîne d’approvisionnement). Si les tendances actuelles seront renforcées, l’UE renforcera son avance technologique, servant principalement le niveau supérieure des marchés et en se concentrant sur l’innovation, la qualité et le design, tandis que les pays émergents pourrant améliorer leur spécialisation dans la production de masse et la production de qualité moyenne.
description: Semestrale di studi e ricerche di geografia, N. 2 (2016)
title: Ο ιατρικός τουρισμός ως παράγοντας τουριστικής ανάπτυξης της Αθήνας
title: Medical tourism as a factor of tourism development of Athens
titleType: AlternativeTitle
Creators: name: Ξένου, Δήμητρα
Publisher: name: Πανεπιστήμιο Δυτικής Αττικής
Year: 2021
Subjects: Ιατρικός τουρισμός

description: Η παρούσα εργασία με θέμα «Ο Ιατρικός Τουρισμός Ως Παράγοντας Τουριστικής Ανάπτυξης Της Αθήνας» συντάχθηκε από τη μεταπτυχιακή φοιτήτρια Δήμητρα Ξένου και η επίβλεψη της πραγματοποιήθηκε από την Δρ. Μαρία Ντουμή, στα πλαίσια του διιδρυματικού μεταπτυχιακού προγράμματος «Καινοτομία και επιχειρηματικότητα στον τουρισμό», του τμήματος Διοίκησης Τουρισμού του Πανεπιστημίου Δυτικής Αττικής και του τμήματος Διοίκησης Επιχειρήσεων του Πανεπιστημίου Αιγαίου. Σκοπός της είναι η διερεύνηση του ιατρικού τουρισμού ως παράγοντα τουριστικής ανάπτυξης στην Αθήνα. Για το λόγο αυτό πραγματοποιήθηκε πρωτογενής και δευτερογενής έρευνα. Αναλυτικότερα, για τη δευτερογενή έρευνα συγκεντρώθηκαν στοιχεία από ελληνική και ξένη αρθρογραφία και βιβλιογραφία και μελετήθηκε η υφιστάμενη κατάσταση του ιατρικού τουρισμού στην Αθήνα. Κατά τη σύνταξη της διπλωματικής εργασίας εμφανίστηκε συρροή κρουσμάτων από τον ιό COVID-19 σε παγκόσμιο επίπεδο. Οι επιπτώσεις του κορονοϊού που επηρέασαν σφόδρα και τη χώρα μας, είχαν αντίκτυπο στη δημόσια υγεία, στον τουρισμό και την οικονομία της Αθήνας. Για το λόγο αυτό θεωρήθηκε σημαντικό να συμπεριληφθεί μια ενότητα που θα αναφέρει τα στοιχεία και τη διαχείριση για τον COVID- 19 σε τοπικό και παγκόσμιο επίπεδο καθώς και τη σύνδεση της πανδημίας με τον ιατρικό τουρισμό από τη σκοπιά της υποβοηθούμενης αναπαραγωγής. Στη συνέχεια πραγματοποιήθηκε έρευνα με σύνταξη δύο ερωτηματολόγιων που απαντήθηκαν απο ιατρούς, κλινικές και εμπλεκόμενους με τον τουρισμό φορείς. Η στατιστική ανάλυση των δεδομένων της έρευνας έγινε με τη χρήση του λογισμικού IBM SPSS. Αναλυτική περιγραφή των αποτελεσμάτων γίνεται στο τελευταίο κεφάλαιο και βάση αυτών καταγράφονται τα συμπεράσματα της έρευνας.
Di monti e di acque. Le rughe e i flussi della terra. Paesaggi, cartografie e modi del discorso geostorico
Creators: name: Lo Iacono, Marianna
Publisher: name: Semestrale di studi e ricerche di geografia
Year: 2017

description: Dall'1 al 3 dicembre 2010 presso Palazzo Geremia e la Biblioteca comunale di Trento si è svolto, il convegno internazionale Di monti e
di acque. Le rughe e i flussi della terra. Paesaggi, cartografie e modi
del discorso geostorico, promosso dal Centro Italiano per gli Studi Storico-Geografici (CISGE) ed organizzato dal Dipartimento di Filosofia, Storia e Beni culturali dellUniversità degli Studi di Trento con il patrocinio della Presidenza del Consiglio della Provincia Autonoma di Trento.
description: Semestrale di studi e ricerche di geografia, N. 1 (2011): La costruzione delle biografie territoriali: archivi e rappresentazione a cura di Marco Maggioli
Optimal Dirichlet Boundary Control by Fourier Neural Operators Applied to Nonlinear Optics
Creators: name: Margenberg, Nils
name: Kärtner, Franz X.
name: Bause, Markus
Publisher: name: arXiv
Year: 2023
Subjects: subject: Numerical Analysis (math.NA)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 78M50, 78M10, 78A60, 65M60, 49M41

description: We present an approach for solving optimal Dirichlet boundary control problems of nonlinear optics by using deep learning. For computing high resolution approximations of the solution to the nonlinear wave model, we propose higher order space-time finite element methods in combination with collocation techniques. Thereby, $C^{l}$-regularity in time of the global discrete is ensured. The resulting simulation data is used to train solution operators that effectively leverage the higher regularity of the training data. The solution operator is represented by Fourier Neural Operators and Gated Recurrent Units and can be used as the forward solver in the optimal Dirichlet boundary control problem. The proposed algorithm is implemented and tested on modern high-performance computing platforms, with a focus on efficiency and scalability. The effectiveness of the approach is demonstrated on the problem of generating Terahertz radiation in periodically poled Lithium Niobate, where the neural network is used as the solver in the optimal control setting to optimize the parametrization of the optical input pulse and maximize the yield of $0.3\,$THz-frequency radiation. We exploit the periodic layering of the crystal to design the neural networks. The networks are trained to learn the propagation through one period of the layers. The recursive application of the network onto itself yields an approximation to the full problem. Our results indicate that the proposed method can achieve a significant speedup in computation time compared to classical methods. A comparison of our results to experimental data shows the potential to revolutionize the way we approach optimization problems in nonlinear optics.
description: 43 pages, 11 figures, 7 tables. Submitted to Journal of Comptutational Physics
La mobilità sanitaria intra-regionale: il ruolo della prossimità geografica nel sistema sanitario abruzzese
Creators: name: Evangelista, Valentina
Publisher: name: Semestrale di studi e ricerche di geografia
Year: 2016

description: Health mobility in a regional context: the role of the geographical proximity in the Abruzzo hospital system
Understanding the logics underlying patients’ mobility flows is crucial in the
definition and the improvement of regional health policies. In this study, were
analyzed the patient mobility flows in an Italian Regional Health system, adopting the conceptual framework of proximity. In the Abruzzo quasi-market scenario, Local Health Authorities (LHA) compete to attract patients: managing patients’ escapes rate is relevant in terms of territorial organization of cares and in their quality perception. Adopting different indicators of geographical proximity, it was shown that escapes rate is significantly correlated with the territorial distribution of hospitals both within and without LHA: the geographical proximity matters but, surprisingly, in a negative manner. Furthermore, patients’ behaviors of choice are more correlated with time measures of proximity than with kilometers measures. Policy implications and equity’s problems are discussed.

La mobilité de la santé dans un contexte régional: le rôle de la proximité géographique dans le système hospitalier des Abruzzes
Comprendre les logiques des flux de mobilité des patients est un thème crucial
dans la définition et l’amélioration des politiques régionales de la santé. Dans cette étude, on a analysé les flux de mobilité des patients dans un système régional de santé italien par le cadre conceptuel de la proximité. Dans le scénario des Abruzzes, les autorités sanitaires locales (ASL) sont en compétition pour attirer les patients: donc la gestion du taux de mobilité des patients entre les ASL est pertinent en termes d’organisation territoriale des soins et dans leur perception de la qualité.
Par l’adoption de différents indicateurs de la proximité géographique, il a été
montré que le taux de mobilité est significativement corrélée avec la répartition
territoriale des hôpitaux à l’intérieur et à l’extérieur des ASL mais, de manière
surprenante, les questions de proximité géographique ont un rôle négatif. En outre, les comportements de choix des patients sont plus corrélés avec des mesures de temps qu’avec kilomètres mesures. Les implications politiques et les problèmes de équité sont discutées.
description: Semestrale di studi e ricerche di geografia, N. 2 (2016)
Supplementary figures from An early dog from southeast Alaska supports a coastal route for the first dog migration into the Americas
Creators: name: Coelho, Flavio Augusto Da Silva
name: Gill, Stephanie
name: Tomlin, Crystal M.
name: Heaton, Timothy H.
name: Lindqvist, Charlotte
Publisher: name: The Royal Society
Year: 2021
Subjects: subject: Evolutionary Biology
subject: FOS: Biological sciences
subject: 40308 Palaeontology (incl. Palynology)
subject: FOS: Earth and related environmental sciences
subject: 60408 Genomics

description: Supplementary figures S1 to S11
A Deep Learning Method for AGILE-GRID GRB Detection
Creators: name: Parmiggiani, N.
name: Bulgarelli, A.
name: Fioretti, V.
name: Di Piano, A.
name: Giuliani, A.
name: Longo, F.
name: Verrecchia, F.
name: Tavani, M.
name: Beneventano, D.
name: Macaluso, A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The follow-up of external science alerts received from Gamma-Ray Bursts (GRB) and Gravitational Waves (GW) detectors is one of the AGILE Team's current major activities. The AGILE team developed an automated real-time analysis pipeline to analyse AGILE Gamma-Ray Imaging Detector (GRID) data to detect possible counterparts in the energy range 0.1-10 GeV. This work presents a new approach for detecting GRBs using a Convolutional Neural Network (CNN) to classify the AGILE-GRID intensity maps improving the GRBs detection capability over the Li&Ma method, currently used by the AGILE team. The CNN is trained with large simulated datasets of intensity maps. The AGILE complex observing pattern due to the so-called 'spinning mode' is studied to prepare datasets to test and evaluate the CNN. A GRB emission model is defined from the Second Fermi-LAT GRB catalogue and convoluted with the AGILE observing pattern. Different p-value distributions are calculated evaluating with the CNN millions of background-only maps simulated varying the background level. The CNN is then used on real data to analyse the AGILE-GRID data archive, searching for GRB detections using the trigger time and position taken from the Swift-BAT, Fermi-GBM, and Fermi-LAT GRB catalogues. From these catalogues, the CNN detects 21 GRBs with a significance $\geq 3 σ$, while the Li&Ma method detects only two GRBs. The results shown in this work demonstrate that the CNN is more effective in detecting GRBs than the Li&Ma method in this context and can be implemented into the AGILE-GRID real-time analysis pipeline.
description: 15 pages, 14 figures, 2 tables, accepted by ApJ
Three-dimensional Dirac Phonons with Inversion Symmetry
Creators: name: Chen, Zhongjia
name: Wang, Rui
name: Xia, Bowen
name: Zheng, Baobing
name: Jin, Yuanjun
name: Zhao, Yu-Jun
name: Xu, Hu
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Dirac semimetals associated with bulk Dirac fermions are well-known in topological electronic systems. In sharp contrast, three-dimensional (3D) Dirac phonons in crystalline solids are still unavailable. Here we perform symmetry arguments and first-principles calculations to systematically investigate 3D Dirac phonons in all space groups with inversion symmetry. The results show that there are two categories of 3D Dirac phonons depending on their protection mechanisms and positions in momentum space. The first category originates from the four-dimensional irreducible representations at the high symmetry points. The second category arises from the phonon branch inversion, and the symmetry guarantees Dirac points to be located along the high symmetry lines. Furthermore, we reveal that non-symmorphic symmetries and the combination of inversion and time-reversal symmetries play essential roles in the emergence of 3D Dirac phonons. Our work not only offers a comprehensive understanding of 3D Dirac phonons but also provides significant guidance for exploring Dirac bosons in both phononic and photonic systems.
Le linee ferroviarie: il ri-uso di un anti-common per la rigenerazione territoriale
Creators: name: Mundula, Luigi
name: Spagnoli, Luisa
Publisher: name: Semestrale di studi e ricerche di geografia
Year: 2016

description: The railways: reuse of anticommons for territorial regeneration
The paper aim to reflect about the many Italian disused railways, which represent a
common good in all respects, whose re-use could trigger a virtuous cycle of territorial regeneration. In some circumstances, however, because of indeterminacy of the regulatory framework characterizing the ownership and management of the Italian railway network, this common becomes an anticommon, generating a situation of under-utilization of the resource itself. Once passed organizational and coordination deadlocks, the “railroad” can represent a territorial regeneration factor, but only if its management will be an asset of the local community.

Les Chemins de fer: la réutilisation des anticommons pour la régénération territoriale
L’objet de cet article est de mettre en lumière les chemins de fer italiens non-exploités qui représentent un bien commun (“Common”) et dont un nouvel usage pourrait entraîner un processus vertueux de requalification territoriale. Néanmoins, dans certaines circonstances, en raison du cadre règlementaire indéterminé caractérisant la propriété et la gestion du réseau ferré italien, ce “common” devient un “anti-common”, générant une sous-utilisation de la ressource elle-même. Une fois les situations de blocages administratifs surmontées, le ferroviaire peut représenter un facteur de
régénération territoriale, seulement dans la mesure où sa gestion devient un atout pour la collectivité locale.
description: Semestrale di studi e ricerche di geografia, N. 2 (2016)