cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Semantics for Robotic Mapping, Perception and Interaction: A Survey
Creators: name: Garg, Sourav
name: Sünderhauf, Niko
name: Dayoub, Feras
name: Morrison, Douglas
name: Cosgun, Akansel
name: Carneiro, Gustavo
name: Wu, Qi
name: Chin, Tat-Jun
name: Reid, Ian
name: Gould, Stephen
name: Corke, Peter
name: Milford, Michael
Publisher: name: arXiv
Year: 2021
Subjects: subject: Robotics (cs.RO)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Human-Computer Interaction (cs.HC)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: For robots to navigate and interact more richly with the world around them, they will likely require a deeper understanding of the world in which they operate. In robotics and related research fields, the study of understanding is often referred to as semantics, which dictates what does the world "mean" to a robot, and is strongly tied to the question of how to represent that meaning. With humans and robots increasingly operating in the same world, the prospects of human-robot interaction also bring semantics and ontology of natural language into the picture. Driven by need, as well as by enablers like increasing availability of training data and computational resources, semantics is a rapidly growing research area in robotics. The field has received significant attention in the research literature to date, but most reviews and surveys have focused on particular aspects of the topic: the technical research issues regarding its use in specific robotic topics like mapping or segmentation, or its relevance to one particular application domain like autonomous driving. A new treatment is therefore required, and is also timely because so much relevant research has occurred since many of the key surveys were published. This survey therefore provides an overarching snapshot of where semantics in robotics stands today. We establish a taxonomy for semantics research in or relevant to robotics, split into four broad categories of activity, in which semantics are extracted, used, or both. Within these broad categories we survey dozens of major topics including fundamentals from the computer vision field and key robotics research areas utilizing semantics, including mapping, navigation and interaction with the world. The survey also covers key practical considerations, including enablers like increased data availability and improved computational hardware, and major application areas where...
description: 81 pages, 1 figure, published in Foundations and Trends in Robotics, 2020
q-Deformed Bi-Local Fields II
Creators: name: Toyoda, Haruki
name: Naka, Shigefumi
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We study a way of $q$-deformation of the bi-local system, the two particle system bounded by a relativistic harmonic oscillator type of potential, from both points of view of mass spectra and the behavior of scattering amplitudes. In our formulation, the deformation is done so that $P^2$, the square of center of mass momentum, enters into the deformation parameters of relative coordinates. As a result, the wave equation of the bi-local system becomes nonlinear with respect to $P^2$; then, the propagator of the bi-local system suffers significant change so as to get a convergent self energy to the second order. The study is also made on the covariant $q$-deformation in four dimensional spacetime.
description: Published in SIGMA (Symmetry, Integrability and Geometry: Methods and Applications) at http://www.emis.de/journals/SIGMA/
TartanVO: A Generalizable Learning-based VO
Creators: name: Wang, Wenshan
name: Hu, Yaoyu
name: Scherer, Sebastian
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Machine Learning (cs.LG)
subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: We present the first learning-based visual odometry (VO) model, which generalizes to multiple datasets and real-world scenarios and outperforms geometry-based methods in challenging scenes. We achieve this by leveraging the SLAM dataset TartanAir, which provides a large amount of diverse synthetic data in challenging environments. Furthermore, to make our VO model generalize across datasets, we propose an up-to-scale loss function and incorporate the camera intrinsic parameters into the model. Experiments show that a single model, TartanVO, trained only on synthetic data, without any finetuning, can be generalized to real-world datasets such as KITTI and EuRoC, demonstrating significant advantages over the geometry-based methods on challenging trajectories. Our code is available at https://github.com/castacks/tartanvo.
Bethe Ansatz for 1D interacting anyons
Creators: name: Batchelor, M. T.
name: Guan, X. -W.
name: He, J. -S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: This article gives a pedagogic derivation of the Bethe Ansatz solution for 1D interacting anyons. This includes a demonstration of the subtle role of the anyonic phases in the Bethe Ansatz arising from the anyonic commutation relations. The thermodynamic Bethe Ansatz equations defining the temperature dependent properties of the model are also derived, from which some groundstate properties are obtained.
description: 22 pages, two references added, small improvements to text
XMM-Newton Detection of the Rare FR II BAL Quasar FIRST J101614.3+520916
Creators: name: Schaefer, Justin J.
name: Brotherton, Michael S.
name: Shang, Zhaohui
name: Gregg, Michael D.
name: Becker, Robert H.
name: Laurent-Muehleisen, Sally A.
name: Lacy, Mark
name: White, Richard L.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have detected FIRST J101614.3+520916 with the XMM-Newton X-ray Observatory. FIRST J101614.3+520916, one of the most extreme radio-loud, broad absorption line (BAL) quasars so far discovered, is also a Fanaroff-Riley type II (FR II) radio source. We find that, compared to its estimated intrinsic X-ray flux, the observed X-rays are likely suppressed, and that the observed hardness ratio indicates significant soft X-ray photons. This is inconsistent with the simplest model, a normal quasar spectrum absorbed by a large neutral HI column density, which would primarily absorb the softer photons. More complex models, involving partial covering, an ionized absorber, ionized mirror reflection, or jet contributions need to be invoked to explain this source. The suppressed but soft X-ray emission in this radio-loud BAL quasar is consistent with the behavior displayed by other BAL quasars, both radio-loud and radio-quiet.
description: 5 pages, 2 figures. Accepted in AJ. (Typos corrected.)
The ESSENCE Supernova Survey: Survey Optimization, Observations, and Supernova Photometry
Creators: name: Miknaitis, G.
name: Pignata, G.
name: Rest, A.
name: Wood-Vasey, W. M.
name: Blondin, S.
name: Challis, P.
name: Smith, R. C.
name: Stubbs, C. W.
name: Suntzeff, N. B.
name: Foley, R. J.
name: Matheson, T.
name: Tonry, J. L.
name: Aguilera, C.
name: Blackman, J. W.
name: Becker, A. C.
name: Clocchiatti, A.
name: Covarrubias, R.
name: Davis, T. M.
name: Filippenko, A. V.
name: Garg, A.
name: Garnavich, P. M.
name: Hicken, M.
name: Jha, S.
name: Krisciunas, K.
name: Kirshner, R. P.
name: Leibundgut, B.
name: Li, W.
name: Miceli, A.
name: Narayan, G.
name: Prieto, J. L.
name: Riess, A. G.
name: Salvo, M. E.
name: Schmidt, B. P.
name: Sollerman, J.
name: Spyromilio, J.
name: Zenteno, A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We describe the implementation and optimization of the ESSENCE supernova survey, which we have undertaken to measure the equation of state parameter of the dark energy. We present a method for optimizing the survey exposure times and cadence to maximize our sensitivity to the dark energy equation of state parameter w=P/rho c^2 for a given fixed amount of telescope time. For our survey on the CTIO 4m telescope, measuring the luminosity distances and redshifts for supernovae at modest redshifts (z~0.5 +- 0.2) is optimal for determining w. We describe the data analysis pipeline based on using reliable and robust image subtraction to find supernovae automatically and in near real-time. Since making cosmological inferences with supernovae relies crucially on accurate measurement of their brightnesses, we describe our efforts to establish a thorough calibration of the CTIO 4m natural photometric system. In its first four years, ESSENCE has discovered and spectroscopically confirmed 102 type Ia SNe, at redshifts from 0.10 to 0.78, identified through an impartial, effective methodology for spectroscopic classification and redshift determination. We present the resulting light curves for the all type Ia supernovae found by ESSENCE and used in our measurement of w, presented in Wood-Vasey et al, 2007.
description: Submitted to ApJ. Companion paper to Wood-Vasey et al (2007). Electronic tables available at http://www.ctio.noao.edu/essence/wresults
Xylocarpus moluccensis M. Roem.
Creators: name: Kenfack, David
name: Tindo, Maurice
name: Gueye, Mathieu
Publisher: name: Zenodo
Year: 2014
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Sapindales
Meliaceae
Xylocarpus
Xylocarpus moluccensis

description: Xylocarpus moluccensis (Lam.) M. Roem. MATERIAL EXAMINED. — Madagascar. F. Ratovoson 934 (MO). — Tanzania. M. Mwangoka 3338 (MO).
description: Published as part of Kenfack, David, Tindo, Maurice & Gueye, Mathieu, 2014, Extranuptial nectaries in Carapa Aubl. (Meliaceae-Cedreloideae), pp. 335-349 in Adansonia (3) (3) 36 (2) on page 349, DOI: 10.5252/a2014n2a13, http://zenodo.org/record/5208635
Spatial localisation beyond steady states in the neighbourhood of the Takens--Bogdanov bifurcation
Creators: name: Alrihieli, Haifaa
name: Rucklidge, Alastair
name: Subramanian, Priya
Publisher: name: arXiv
Year: 2020
Subjects: subject: Pattern Formation and Solitons (nlin.PS)
subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: The coincidence of a pitchfork and Hopf bifurcation at a Takens-Bogdanov (TB) bifurcation occurs in many physical systems such as double-diffusive convection, binary convection and magnetoconvection. Analysis of the associated normal form, in one dimension with periodic boundary condition, shows the existence of steady patterns, standing waves, modulated waves and travelling waves, where the values of coefficients of the terms in the normal form classify all possible different bifurcation scenarios in the neighbourhood of the TB bifurcation (Dangelmayr & Knobloch, 1987). In this work we develop a new and simple pattern-forming PDE model, based on the Swift-Hohenberg equation, adapted to have the TB normal form at onset, which allows us to explore the dynamics in a wide range of bifurcation scenarios, including in domains much wider than the lengthscale of the pattern. We identify two bifurcation scenarios in which coexistence between different types of solutions is indicated from the analysis of the normal form equation. In these scenarios, we look for spatially localised solutions by examining pattern formation in wide domains. We recover two types of localised states, that of a localised steady state in the background of the trivial state and that of a spatially localised travelling wave in the background of the trivial state which have previously been observed in other systems. Additionally, we identify two new types of spatially localised states: that of a localised steady state in a modulated wave background and that of a localised travelling wave in a steady state background. The PDE model is easy to solve numerically in large domains and so will allow further investigation of pattern formation with a TB bifurcation in one or more dimensions and the exploration of a range of background and foreground pattern combinations beyond steady states.
description: 26 pages, 11 figures, 3 movies
The statistical properties of galaxy morphological types in compact groups of Main galaxies from the SDSS Data Release 4
Creators: name: Deng, Xin-Fa
name: Jiang, Peng
name: He, Cong-Gen
name: Luo, Cheng-Hong
name: He, Ji-Zhou
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: In order to explore the statistical properties of galaxy morphological types in compact groups (CGs), we construct a random group sample which has the same distributions of redshift and number of member galaxies as those of the CG sample. It turns out that the proportion of early-type galaxies in different redshift bins for the CG sample is statistically higher than that for random group sample, and with growing redshift z this kind of difference becomes more significant. This may be due to the existence of interactions and mergers within a significant fraction of SDSS CGs. We also compare statistical results of CGs with those of more compact groups and pairs, but do not observe as large statistical difference as Hickson (1982)'results.
description: 12 pages, 9 figures
Quantum Spin Hall Effect and Topologically Invariant Chern Numbers
Creators: name: Sheng, D. N.
name: Weng, Z. Y.
name: Sheng, L.
name: Haldane, F. D. M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: We present a topological description of quantum spin Hall effect (QSHE) in a two-dimensional electron system on honeycomb lattice with both intrinsic and Rashba spin-orbit couplings. We show that the topology of the band insulator can be characterized by a $2\times 2$ traceless matrix of first Chern integers. The nontrivial QSHE phase is identified by the nonzero diagonal matrix elements of the Chern number matrix (CNM). A spin Chern number is derived from the CNM, which is conserved in the presence of finite disorder scattering and spin nonconserving Rashba coupling. By using the Laughlin's gedanken experiment, we numerically calculate the spin polarization and spin transfer rate of the conducting edge states, and determine a phase diagram for the QSHE.
description: 4 pages and 4 figures
Service Registry and Discovery of Stateful Systems in Virtual Machines
Creators: name: Garg, Rishabh
Publisher: name: Zenodo
Year: 2023

description: Service registry and discovery in stateful systems within virtual machines (VMs) involve managing how services locate and communicate with each other. In a stateful system, where the system's state is critical for operations, services must be aware of each other's availability and location. A service registry acts as a centralized directory, where VMs register their services upon startup. Other services can query this registry to discover needed components. This approach ensures that services in dynamic environments can reliably find each other, even when instances are created, terminated, or moved across VMs.
Toward action research as a vehicle for implementing the NCTM Standards in secondary mathematics classrooms
Creators: name: Walton, Nancy Louise
Publisher: name: University of British Columbia
Year: 2009

description: This thesis depicts a story of three teachers, one of whom is the researcher, who are trying to implement aspects of the National Council of Teachers of Mathematics (NCTM) "Standards" through the use of a collaborative action research model. The study investigates the research question, "What themes recur when teachers use collaborative action research as a vehicle for implementing the N C T M Standards?" The teachers worked together from June, 1994 to February, 1995, meeting twice a month during the school year. Each teacher developed their own action research cycle for exploring some aspect of the Standards. In addition, this researcher documented the progress of the group. Data analysis revealed five themes which seemed to affect the feelings of success experienced by the participants. These themes are: research expertise, structure, classroom research focus, readiness and group discussions. Although these themes permeated and grew throughout the process it is important to note that their labelling and indeed recognition of their nature was not complete until this researcher analyzed data after the project action research cycle ended. This researcher recommends that government officials, universities and school administrators provide incentives for change, support for implementing change and opportunities to link with full time researchers. University action research instructors may consider providing a practical experience component to action research courses. Mathematics teachers may find it helpful to determine their "stage of readiness" in relation to the Standards before they embark on an action research project. Becoming comfortable with Standards oriented activities seems to be an important component of realizing the Standards vision in one's teaching practice.
Surface subgroups from homology
Creators: name: Calegari, Danny
Publisher: name: arXiv
Year: 2008
Subjects: subject: Group Theory (math.GR)
subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: 20F65; 20F67; 57M07

description: Let G be a word-hyperbolic group, obtained as a graph of free groups amalgamated along cyclic subgroups. If H_2(G;Q) is nonzero, then G contains a closed hyperbolic surface subgroup. Moreover, the unit ball of the Gromov-Thurston norm on H_2(G;R) is a finite-sided rational polyhedron.
description: 9 pages; version 2: typos corrected
Number of near-Earth objects and formation of lunar craters over the last billion years
Creators: name: Ipatov, S. I.
name: Feoktistova, E. A.
name: Svettsov, V. V.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: We compare the number of lunar craters larger than 15 km across and younger than 1.1 Ga to the estimates of the number of craters that could have been formed for 1.1 Ga if the number of near-Earth objects and their orbital elements during that time were close to the corresponding current values. The comparison was performed for craters over the entire lunar surface and in the region of the Oceanus Procellarum and maria on the near side of the Moon. In these estimates, we used the values of collision probabilities of near-Earth objects with the Moon and the dependences of the crater diameters on the impactor sizes. According to the estimates made by different authors, the number density of known Copernican craters with diameters D>15 km in mare regions is at least double the corresponding number for the remaining lunar surface. Our estimates do not contradict the growth in the number of near-Earth objects after probable catastrophic fragmentations of large main-belt asteroids, which may have occurred over the recent 300 Ma; however, they do not prove this increase. Particularly, they do not conflict with the inference made by Mazrouei et al. (2019) that 290 Ma ago the frequency of collisions of near-Earth asteroids with the Moon increased by 2.6 times. For a probability of a collision of an Earth-crossing object (ECO) with the Earth in a year equaled to 10^-8, our estimates of the number of craters agree with the model, according to which the number densities of the 15-km Copernican craters for the whole lunar surface would have been the same as that for mare regions if the data by Losiak et al. (2015) for D<30 km were as complete as those for D>30 km. With this collision probability of ECOs with the Earth and for this model, the cratering rate may have been constant over the recent 1.1 Ga.
description: 21 pages, 1 figure
A Solution to the Galactic Foreground Problem for LISA
Creators: name: Crowder, Jeff
name: Cornish, Neil
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Low frequency gravitational wave detectors, such as the Laser Interferometer Space Antenna (LISA), will have to contend with large foregrounds produced by millions of compact galactic binaries in our galaxy. While these galactic signals are interesting in their own right, the unresolved component can obscure other sources. The science yield for the LISA mission can be improved if the brighter and more isolated foreground sources can be identified and regressed from the data. Since the signals overlap with one another we are faced with a ``cocktail party'' problem of picking out individual conversations in a crowded room. Here we present and implement an end-to-end solution to the galactic foreground problem that is able to resolve tens of thousands of sources from across the LISA band. Our algorithm employs a variant of the Markov Chain Monte Carlo (MCMC) method, which we call the Blocked Annealed Metropolis-Hastings (BAM) algorithm. Following a description of the algorithm and its implementation, we give several examples ranging from searches for a single source to searches for hundreds of overlapping sources. Our examples include data sets from the first round of Mock LISA Data Challenges.
description: 19 pages, 27 figures
Exact equilibria of a stellar system in a linearised tidal field
Creators: name: Mitchell, David G. M.
name: Heggie, Douglas C.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We study the motion of stars in a star cluster which revolves in a circular orbit about its parent galaxy. The star cluster is modelled as an ellipsoid of uniform spatial density. We exhibit two 2-parameter families of self-consistent equilibrium models in which the velocity at each point is confined to a line in velocity space. We exhibit the link between this problem and that of a uniform rotating ellipsoidal galaxy. With minimal adaptation, Freeman's bar models yield a third family.
description: 4 pages, 5 figures, accepted by MNRAS
Interpretation of cosmological expansion effects on the quantum-classical transition
Creators: name: Herzenberg, C. L.
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: Recently, what appears to be a fundamental limit associated with the size of an object that separates the quantum behavior characterizing small objects from the classical behavior characterizing large objects has been derived from the Hubble velocity spread in an extended object. This threshold is now examined further and interpreted in terms of diffusion processes in stochastic quantum mechanics. This limiting size that separates quantum behavior from classical behavior is shown to correspond approximately to the diffusion distance of the object over the Hubble time.
description: 8 pages, 0 figures
Το "κοινωνικό μουσείο": μουσειακή ταυτότητα, επικοινωνία και μάρκετινγκ στην εποχή των "κοινωνικών μέσων"
Creators: name: Ρεπούσκου, Μάγδα Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: subject: Μουσείο
subject: Επικοινωνία
subject: Μάρκετινγκ
subject: Museum
subject: Communication
subject: Marketing
subject: FOS: Economics and business

description: Ο ερευνητικός πυρήνας συνοψίζεται στη χρήση των κοινωνικών δικτύων ως ένα από τα βασικά εργαλεία ψηφιακής επικοινωνίας που υποστηρίζουν διαδραστικά την κατασκευή της μουσειακής ταυτότητας. Παράλληλα οι πλατφόρμες κοινωνικής δικτύωσης είναι ένα πεδίο διαμόρφωσης νέων επαγγελματικών προφίλ και προσέλκυσης της συμμετοχικότητας των χρηστών. Αν και το άνοιγμα σε ένα διευρυμένο κοινό αποτελεί μια αντικειμενική αλήθεια στον ψηφιακό κόσμο, θα απασχολήσει επίσης η ανιχνεύσιμη διασύνδεση μεταξύ της διαδικτυακής επίσκεψης και της φυσικής εμπειρίας. Στα πλαίσια της πρωτογενούς έρευνας παρουσιάζονται ενδεικτικά παραδείγματα ελληνικών μουσείων με στόχο να προσμετρηθούν η ψηφιακή δραστηριοποίηση στα κοινωνικά μέσα και οι στρατηγικές μάρκετινγκ που εφαρμόζονται.
description: The core of this research can be summarized in the use of social media as one of the key tools of digital communication that support interactively the construction of museum identity. Social networks can also be seen as platforms that generate new professional profiles and attract user engagement. Although audience broadening is an objective reality in the digital world, another argument reflects on the tangible connection between the virtual visit and the physical experience. Selected Greek museums are presented as case studies in order to gauge their digital impact in social media as well as the marketing practices applied.
description: Σε συνεργασία με το Παιδαγωγικό Τμήμα Δημοτικής Εκπαίδευσης (Πανεπιστήμιο Δυτικής Μακεδονίας)
The Equatorial Jet Speed on Tidally Locked Planets: I -- Terrestrial Planets
Creators: name: Hammond, Mark
name: Tsai, Shang-Min
name: Pierrehumbert, Raymond T.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Atmospheric and Oceanic Physics (physics.ao-ph)
subject: FOS: Physical sciences

description: The atmospheric circulation of tidally locked planets is dominated by a superrotating eastward equatorial jet. We develop a predictive theory for the formation of this jet, proposing a mechanism in which the three-dimensional stationary waves induced by the day-night forcing gradient produce an equatorial acceleration. This is balanced in equilibrium by an interaction between the resulting jet and the vertical motion of the atmosphere. The three-dimensional structure of the zonal acceleration is vital to this mechanism. We demonstrate this mechanism in a hierarchy of models. We calculate the three-dimensional stationary waves induced by the forcing on these planets, and show the vertical structure of the zonal acceleration produced by these waves, which we use to suggest a mechanism for how the jet forms. GCM simulations are used to confirm the equilibrium state predicted by this mechanism, where the acceleration from these waves is balanced by an interaction between the zonal-mean vertical velocity and the jet. We derive a simple model of this using the "Weak Temperature Gradient" approximation, which gives an estimate of the jet speed on a terrestrial tidally locked planet. We conclude that the proposed mechanism is a good description of the formation of an equatorial jet on a terrestrial tidally locked planet, and should be useful for interpreting observations and simulations of these planets. The mechanism requires assumptions such as a large equatorial Rossby radius and weak acceleration due to transient waves, and a different mechanism may produce the equatorial jets on gaseous tidally locked planets.
description: Accepted by ApJ
Sum rules for the ground states of the O(1) loop model on a cylinder and the XXZ spin chain
Creators: name: Di Francesco, P.
name: Zinn-Justin, P.
name: Zuber, J. -B.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mathematical Physics (math-ph)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Combinatorics (math.CO)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: The sums of components of the ground states of the O(1) loop model on a cylinder or of the XXZ quantum spin chain at Delta=-1/2 (of size L) are expressed in terms of combinatorial numbers. The methods include the introduction of spectral parameters and the use of integrability, a mapping from size L to L+1, and knot-theoretic skein relations.
description: final version to be published
Φωτο-μνήμη, ένα εκπαιδευτικό πρόγραμμα για μεγαλύτερους ενήλικες στο Μουσείο Φωτογραφίας Θεσσαλονίκης
Creators: name: Γκιούνα, Αγάπη Ιωάννη
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: Μουσειοπαιδαγωγική
μεγαλύτεροι ενήλικες
Μουσείο Φωτογραφίας Θεσσαλονίκης
Museum education
older adults
Photography Museum of Thessaloniki

description: Αντικείμενο της διπλωματικής εργασίας είναι ένα εκπαιδευτικό πρόγραμμα στο Μουσείο Φωτογραφίας Θεσσαλονίκης με συμμετέχοντες μεγαλύτερους ενήλικες, ενήλικες δηλαδή στα πρώτα χρόνια της σύνταξης. Το πρόγραμμα αυτό σχεδιάστηκε, εφαρμόστηκε και αξιολογήθηκε. Βασίστηκε σε θεωρίες εκπαίδευσης ενηλίκων και στη σύγχρονη μουσειοπαιδαγωγική προκειμένου να σχεδιαστεί ένα βιωματικό πρόγραμμα με αφορμή την έκθεση της Photobiennale, η οποία έλαβε χώρα στο Μουσείο Φωτογραφίας Θεσσαλονίκης. Το πρόγραμμα εφαρμόστηκε σε ομάδα των οκτώ ατόμων και αξιολογήθηκε μέσα από τα μεθοδολογικά εργαλεία της παρατήρησης και της συνέντευξης.
description: The subject of this thesis is an educational program which took place at Photography Museum of Thessaloniki. The target group for the program was older adults during the first years of retirement. The education program was designed, realized and evaluated. It was based on theories for adult learning and contemporary museum education. The outcome was an experiential program which was designed for the Photobiennale exhibition at Photography Museum of Thessaloniki. The program was implemented in a group of eight people and was evaluated through observation and interviews.
description: Σε συνεργασία με το Παιδαγωγικό Τμήμα Δημοτικής Εκπαίδευσης (Πανεπιστήμιο Δυτικής Μακεδονίας)
title: R scripts for the peer-reviewed publication (DOI : 10.1038/s41612-025-01028-6)
title: R scripts for 'Identifying source of predictability for vapor pressure deficit variability in the southwestern United States'
titleType: AlternativeTitle
Creators: name: Lou, Jiale
Publisher: name: Zenodo
Year: 2025

description: The R scripts provided here support the reproducibility of the peer-reviewed paper, "Identifying Sources of Predictability for Vapor Pressure Deficit Variability in the Southwestern United States" (DOI: 10.1038/s41612-025-01028-6). All future requests for data, code clarification, or collaboration are welcome and can be directed to the corresponding author.
The Social Network of Contemporary Popular Musicians
Creators: name: Park, Juyong
name: Celma, Oscar
name: Koppenberger, Markus
name: Cano, Pedro
name: Buldú, Javier M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Physics and Society (physics.soc-ph)
subject: FOS: Physical sciences

description: In this paper we analyze two social network datasets of contemporary musicians constructed from allmusic.com (AMG), a music and artists' information database: one is the collaboration network in which two musicians are connected if they have performed in or produced an album together, and the other is the similarity network in which they are connected if they where musically similar according to music experts. We find that, while both networks exhibit typical features of social networks such as high transitivity, several key network features, such as degree as well as betweenness distributions suggest fundamental differences in music collaborations and music similarity networks are created.
description: 7 pages, 2 figures
Kapītipis ē-pimohteyahk: aboriginal street youth in Vancouver, Winnipeg, and Montreal
Creators: name: Gilchrist, Laurette
Publisher: name: University of British Columbia
Year: 2009

description: “kapītipis ē-pimohteyahk: Aboriginal Street youth in Vancouver, Winnipeg and Montreal” seeks to gain insight into life on city streets for Aboriginal youth: why they go to the street, how they survive, what kinds of services they are more likely to use, what changes they envision for services provided to them, and finally to recommend corresponding changes in service delivery and preventative measures. The primary interest is their perceptions of their experiences on the Street — as Aboriginal people — as much as possible in their own voice, and in such a way as to contextualize their lives in Canadian structural colonial history and in modern urban terms. Utilizing a critical case study method, in-depth interviews were conducted with nine youth, ages 14-20, currently involved in urban Street life and two people who have lived on the street in the past. To contextualize their experiences, several parents of street youth and street services personnel in Vancouver, Winnipeg and Montreal were interviewed, although with less depth. Each city has an Aboriginal population in excess of 35,000. The literature on street youth in general is growing, but a paucity of information exists on Aboriginal street youth experience in Canada, even though they are over-represented in the street youth population in most cities. By placing Aboriginal street youth in the larger context of mainstream society and the urban environment, and by highlighting the role of current and historical structural impacts, this research has been able to access a holistic view of their lives. The interviews suggest that Aboriginal street youth run to the streets for many of the same reasons as any other street youth, and once they get there their methods of survival are also somewhat the same as those of many runaways. Their cultural backgrounds, history, and structural conditions at point of origin are, however, different from non-Aboriginal street youth. These conditions make them subject to harsher conditions in state care situations (a common entry-point to street life) and on the street. Many experience overt racism, in addition to the stigmatization that street people encounter, in their everyday lives. The youth interviewed told of identity confusion and self hatred, dislocation from home and surrogate parent communities, difficulty in reunification, and ignorance about Aboriginal rights, history and culture. The nature of the relationship between Aboriginality and being a young street person is clearly established in that ethnicity was a salient factor in the antecedents to street life and in the conditions once on the street. Interviews with former street persons suggest that race and culture continue to be salient in the process of leaving the street and in staying off the street.
The contribution of the Unresolved Extragalactic Radio Sources to the Brightness Temperature of the sky
Creators: name: Gervasi, M.
name: Tartari, A.
name: Zannoni, M.
name: Boella, G.
name: Sironi, G.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The contribution of the Unresolved Extragalactic Radio Sources to the diffuse brightness of the sky was evaluated using the source number - flux measurements available in literature. We first optimized the fitting function of the data based on number counts distribution. We then computed the brightness temperature at various frequencies from 151 MHz to 8440 MHz and derived its spectral dependence. As expected the frequency dependence can be described by a power law with a spectral index $γ\simeq -2.7$, in agreement with the flux emitted by the {\it steep spectrum} sources. The contribution of {\it flat spectrum} sources becomes relevant at frequencies above several GHz. Using the data available in literature we improved our knowledge of the brightness of the unresolved extragalactic radio sources. The results obtained have general validity and they can be used to disentangle the various contributions of the sky brightness and to evaluate the CMB temperature.
description: Accepted for publication in the Astrophysical Journal
Efficient Data Structures for Model-free Data-Driven Computational Mechanics
Creators: name: Eggersmann, Robert
name: Stainier, Laurent
name: Ortiz, Michael
name: Reese, Stefanie
Publisher: name: arXiv
Year: 2020
Subjects: subject: Computational Engineering, Finance, and Science (cs.CE)
subject: FOS: Computer and information sciences
subject: J.2

description: The data-driven computing paradigm initially introduced by Kirchdoerfer and Ortiz (2016) enables finite element computations in solid mechanics to be performed directly from material data sets, without an explicit material model. From a computational effort point of view, the most challenging task is the projection of admissible states at material points onto their closest states in the material data set. In this study, we compare and develop several possible data structures for solving the nearest-neighbor problem. We show that approximate nearest-neighbor (ANN) algorithms can accelerate material data searches by several orders of magnitude relative to exact searching algorithms. The approximations are suggested by--and adapted to--the structure of the data-driven iterative solver and result in no significant loss of solution accuracy. We assess the performance of the ANN algorithm with respect to material data set size with the aid of a 3D elasticity test case. We show that computations on a single processor with up to one billion material data points are feasible within a few seconds execution time with a speedup of more than 106 with respect to exact k-d trees.
Κυκλοφοριακά χαρακτηριστικά και εξωτερικό κόστος μετακίνησης πριν και μετά την κρίση στο Πολεοδομικό Συγκρότημα Θεσσαλονίκης - Αναπροσαρμογή της διαχείρισης κυκλοφορίας με τα σημερινά δεδομένα
Creators: name: Σωτηρίου, Ματίνα Σωτηρίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: εξωτερικό κόστος
οικονομική κρίση
βιώσιμη κινητικότητα
external costs
economic crisis
sustainable mobility

description: Η βιώσιμη κινητικότητα, δηλαδή η μεγιστοποίηση του μεταφορικού έργου με ταυτόχρονη ελαχιστοποίηση των επιπτώσεών του στο περιβάλλον, αποτελεί το ζητούμενο για τις σύγχρονες ευρωπαϊκές, και όχι μόνο, πόλεις. Οι μεγαλουπόλεις της Ελλάδας απέχουν πολύ από την υλοποίηση της εν λόγω έννοιας, παρά το πλήθος διαθέσιμων προς μίμηση παραδειγμάτων. Παράλληλα, μία πόλη που πλήττεται από τις συνέπειες της παγκόσμιας οικονομικής κρίσης είναι εύλογο να αναρωτιέται εάν χωρούν τέτοιοι προβληματισμοί στις προτεραιότητές της. Ο υπολογισμός του εξωτερικού κόστους ως μέρος του γενικευμένου κόστους μετακίνησης είναι αυτός που θα δώσει και την απάντηση στο ερώτημα, εάν υπάρχει το περιθώριο επένδυσης σε μία προοπτική βιώσιμης κινητικότητας. Η οργάνωση και η διαχείριση των υποδομών στη Θεσσαλονίκη για την επίτευξη ενός βιώσιμου συστήματος κυκλοφορίας είναι μία συνισταμένη πολλών παραμέτρων, κάθε μία από τις οποίες έχει ιδιαίτερη σημασία και ανάλογη δυσκολία εφαρμογής. Τα προβλήματα που επέφερε η οικονομική κρίση είναι γνωστά και μη αμφισβητήσιμα. Προκύπτει, όμως, πως μέσα από την ανάγκη για τη μείωση του ιδιωτικού κόστους μετακίνησης επέρχεται μία ταυτόχρονη μείωση του εξωτερικού κόστους με οφέλη για το κοινωνικό σύνολο. Αυτή η ευκαιρία που εμφανίζεται, θα πρέπει να εκμεταλλευτεί τώρα, περισσότερο από ποτέ όχι ως πολυτέλεια, αλλά ως ανάγκη.
description: Sustainable mobility, namely the maximization of transportation activity while minimizing its impact on the environment, is a challenge for modern European and other cities. The cities of Greece are far from implementing this concept, despite the number of available examples to follow. At the same time, a city affected by the consequences of the economic crisis, is reasonable to wonder whether such considerations fit its priorities. The calculation of external costs as part of the generalized cost of travel is giving the answer to the question whether there is room for investment in a perspective of sustainable mobility. The organization and management of infrastructure in Thessaloniki in order to achieve a sustainable traffic system is a result of many parameters, each of which is of particular importance and difficulty. The problems brought by the economic crisis are known and non-controversial. It appears, however, that through the need to reduce the private cost of travel occurs a simultaneous reduction of the external costs with benefits to society. This opportunity should be exploited now, more than ever, not as a luxury but as a necessity.
The molecular envelope around the red supergiant VY CMa
Creators: name: Muller, S.
name: Dinh-V-Trung
name: Lim, J.
name: Hirano, N.
name: Muthu, C.
name: Kwok, S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present millimeter interferometric observations of the molecular envelope around the red supergiant VY CMa with the SubMillimeter Array (SMA). The high angular resolution (< 2'') allows us to derive the structure of the envelope as observed in the 1.3 mm continuum, 12CO(2-1), 13CO(2-1) and SO(6,5-5,4) lines emission. The circumstellar envelope is resolved into three components: a dense, compact and dusty central component, embedded in a more diffuse and extended envelope plus a high velocity component. We construct a simple model, consisting of a spherically symmetric slowly expanding envelope and bipolar outflows with a wide opening angle (~ 120 deg.) viewed close to the line of sight (i = 15 deg.). Our model can explain the main features of the SMA data and previous single-dish CO multi-line observations. An episode of enhanced mass loss along the bipolar direction is inferred from our modelling. The SMA data provide a better understanding of the complicated morphology seen in the optical/IR high resolution observations.
description: accepted for publication in ApJ
Analytical Solution for Bosonic Fields in the FRW Multiply Warped Braneworld
Creators: name: Ribeiro, A. S.
name: Alencar, G.
name: Landim, R. R.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this paper we find analytical solutions for the scalar and gauge fields in the Freedman-Robertson-Walker multiply warped braneworld scenario. With this we find the precise mass spectra for these fields. We compare these spectra with that previously found in the literature for the static case.
description: arXiv admin note: substantial text overlap with arXiv:1911.00528
Probing the quantum state of a guided atom laser pulse
Creators: name: Moore, Kevin L.
name: Gupta, Subhadeep
name: Murch, Kater W.
name: Stamper-Kurn, Dan M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We describe bichromatic superradiant pump-probe spectroscopy as a tomographic probe of the Wigner function of a dispersing particle beam. We employed this technique to characterize the quantum state of an ultracold atomic beam, derived from a Rb-87 Bose-Einstein condensate, as it propagated in a 2.5 mm diameter circular waveguide. Our measurements place an upper bound on the longitudinal phase-space area occupied by the 300,000 atom beam of 9(1) $\hbar$ and a lower bound on the coherence length (L > 13 microns). These results are consistent with full quantum degeneracy after multiple orbits around the waveguide.
description: 4 pages, 3 figures
A Discourse Study of Institutional Language in the Home Birth Setting
Creators: name: Forster, Yolanda
Publisher: name: Zenodo
Year: 2019
Subjects: midwifery, home birth, unassisted birth, free birth, obstetrics, maternity care, obstetric violence, birth trauma, critical discourse studies, systemic functional linguistics, socio-cognitive discourse analysis

description: Very few peer-reviewed papers have been published looking at language in childbirth. This cross-disciplinary thesis is a small step that examines language from the outside the gatekeepers' perspectives and one where the woman centred perspective is rarely given precedence. At a time when women's autonomy in birth as in other areas of life is greatly diminished and is continually under threat, this paper identifies some of the threats to birth that women have faced since the eyes of patriarchy turned toward their reproductive autonomy.
Στοιχεία Φασματικής Θεωρίας Υπερβολικών Επιφανειών.:
Creators: name: Φλωρόπουλος, Νικόλαος Συμεών
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: Φασματική Θεωρία
Υπερβολικές Επιφάνειες
Fucshian Ομάδες
Spectral Theory
Hyperbolic Surfaces
Fuchsian Groups

description: Στην παρούσα εργασία κάνουμε μια ανασκόπηση κάποιων στοιχείων της φασματικής θεωρίας υπερβολικών επιφανειών. Πιο συγκεκριμένα παρουσιάζουμε κάποιες τεχνικές γεωμετρικής διασκορπιστκής θεωρίας που επιτρέουν τον χαρακτηρισμό του φάσματος υπερβολικών επιφανειών άπειρου εμβαδού.
description: In the present thesis we give a review of certain elements of spectral theory of hyperbolic surfaces. More specifically we present some techniques from geometric scattering theory that can be used to specify the spectrum of hyperbolic surfaces of infinite area.
Kahler Potentials of Chiral Matter Fields for Calabi-Yau String Compactifications
Creators: name: Conlon, Joseph P.
name: Cremades, Daniel
name: Quevedo, Fernando
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The Kahler potential is the least understood part of effective N=1 supersymmetric theories derived from string compactifications. Even at tree-level, the Kahler potential for the physical matter fields, as a function of the moduli fields, is unknown for generic Calabi-Yau compactifications and has only been computed for simple toroidal orientifolds. In this paper we describe how the modular dependence of matter metrics may be extracted in a perturbative expansion in the Kahler moduli. Scaling arguments, locality and knowledge of the structure of the physical Yukawa couplings are sufficient to find the relevant Kahler potential. Using these techniques we compute the `modular weights' for bifundamental matter on wrapped D7 branes for large-volume IIB Calabi-Yau flux compactifications. We also apply our techniques to the case of toroidal compactifications, obtaining results consistent with those present in the literature. Our techniques do not provide the complex structure moduli dependence of the Kahler potential, but are sufficient to extract relevant information about the canonically normalised matter fields and the soft supersymmetry breaking terms in gravity mediated scenarios.
description: JHEP style, 24 pages, 4 figures. v2: New section and reference added
Double prompt $J/\psi$ hadroproduction in the parton Reggeization approach with BFKL resummation
Creators: name: He, Zhi-Guo
name: Kniehl, Bernd A.
name: Nefedov, Maxim A.
name: Saleev, Vladimir A.
Publisher: name: Deutsches Elektronen-Synchrotron, DESY, Hamburg
Year: 2019
Subjects: invariance: gauge
radiation: initial-state interaction
higher-order: 0
hadroproduction
BFKL equation
resummation
parton
Regge
total cross section
transverse momentum
factorization
initial state
rapidity
ATLAS
meson
CMS

description: We study double prompt $J/\psi$ hadroproduction within the nonrelativistic-QCD factorization formalism adopting the parton Reggeization approach to treat initial-state radiation in a gauge invariant and infrared-safe way. We present first predictions for the cross section distributions in the transverse momenta of the subleading $J/\psi$ meson and the $J/\psi$ pair. Already at leading order in $\alpha_s$, these predictions as well as those for the total cross section and its distributions in the invariant mass $m_{\psi\psi}$ and the rapidity separation $|Y|$ of the $J/\psi$ pair nicely agree with recent ATLAS and CMS measurements, except for the large-$m_{\psi\psi}$ and large-$|Y|$ regions, where the predictions substantially undershoot the data. In the latter regions, BFKL resummation is shown to enhance the cross sections by up to a factor of two and so to improve the description of the data.
Tangent Lifts of Poisson and Related Structures
Creators: name: Grabowski, Janusz
name: Urbanski, Pawel
Publisher: name: arXiv
Year: 2007
Subjects: subject: Differential Geometry (math.DG)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 53C15, 53C12, 53D17

description: The derivation $d_T$ on the exterior algebra of forms on a manifold $M$ with values in the exterior algebra of forms on the tangent bundle $TM$ is extended to multivector fields. These tangent lifts are studied with applications to the theory of Poisson structures, their symplectic foliations, canonical vector fields and Poisson-Lie groups.
description: 33 pages. To make the 1995-paper easily available