cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Image Rotation from weak Lensing
Creators: name: Francfort, Jérémie
name: Cusin, Giulia
name: Durrer, Ruth
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Classical Physics (physics.class-ph)
subject: FOS: Physical sciences

description: Forthcoming radio surveys will include full polarisation information, which can be potentially useful for weak lensing observations. We propose a new method to measure the (integrated) gravitational field between a source and the observer, by looking at the angle between the morphology of a radio galaxy and the orientation of the polarisation. For this we use the fact that, while the polarisation of a photon is parallel transported along the photon geodesic, the infinitesimal shape of the source, e.g. its principal axis in the case of an ellipse, is Lie transported. As an example, we calculate the rotation of the shape vector with respect to the polarisation direction which is generated by lensing by a distribution of foreground Schwarzschild lenses. For radio galaxies, the intrinsic morphological orientation of a source and its polarised emission are correlated. It follows that observing both the polarisation and the morphological orientation provides information on both the unlensed source orientation and on the gravitational potential along the line of sight.
description: 30 pages (app included) 8 figures
The substructure of the Perseus star forming region: A survey with Gaia DR2
Creators: name: Pavlidou, Tatiana
name: Scholz, Aleks
name: Teixeira, Paula S.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We use photometric and kinematic data from Gaia DR2 to explore the structure of the star forming region associated with the molecular cloud of Perseus. Apart from the two well known clusters, IC 348 and NGC 1333, we present five new clustered groups of young stars, which contain between 30 and 300 members, named Autochthe, Alcaeus, Heleus, Electryon and Mestor. We demonstrate these are co-moving groups of young stars, based on how the candidate members are distributed in position, proper motion, parallax and colour-magnitude space. By comparing their colour-magnitude diagrams to isochrones we show that they have ages between 1 and 5 Myr. Using 2MASS and WISE colours we find that the fraction of stars with discs in each group ranges from 10 to 50 percent. The youngest of the new groups is also associated with a reservoir of cold dust, according to the Planck map at 353 GHz. We compare the ages and proper motions of the five new groups to those of IC 348 and NGC 1333. Autochthe is clearly linked with NGC 1333 and may have formed in the same star formation event. The seven groups separate roughly into two sets which share proper motion, parallax and age: Heleus, Electryon, Mestor as the older set, and NGC 1333, Autochthe as the younger set. Alcaeus is kinematically related to the younger set, but at a more advanced age, while the properties of IC 348 overlap with both sets. All older groups in this star forming region are located at higher galactic latitude.
description: 27 pages, 12 figures; Note added in proof; Added references
Τάσος Μαντζαβίνος. Τραύμα και Μνήμη
Creators: name: Πεσματζόγλου, Ανδρομάχη Θεοδοσίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2017
Subjects: Τάσος Μαντζαβίνος
Τραύμα
Μνήμη
Tassos Mantzavinos
Trauma
Memory

description: Η παρούσα διπλωματική εργασία εκπονήθηκε στο πλαίσιο του Διαπανεπιστημιακού Προγράμματος Μεταπτυχιακών Σπουδών Μουσειολογίας του Τμήματος Αρχιτεκτόνων του Αριστοτελείου Πανεπιστημίου Θεσσαλονίκης. Περιλαμβάνει αναφορά στην επιμελητική πρακτική, όπως εξελίχτηκε ιστορικά και εφαρμόζεται στις μέρες μας στις εκθέσεις σύγχρονης τέχνης και τον ρόλο του επιμελητή. Στη συνέχεια γίνεται η κριτική παρουσίαση της έκθεσης με τίτλο «Τάσος Μαντζαβίνος. Η δύναμίς μου εν ασθενεία τελειούται», η οποία πραγματοποιήθηκε σε επιμέλεια της Ελισάβετ Πλέσσα και αρχιτεκτονικό σχεδιασμό του Σταμάτη Ζάννου το 2012 στο Μουσείο Μπενάκη στην Αθήνα. Στο τελευταίο μέρος της εργασίας διατυπώνεται η μουσειολογική νοηματική μελέτη για μια νέα έκθεση του Τάσου Μαντζαβίνου στο Μακεδονικό Μουσείο Σύγχρονης Τέχνης στη Θεσσαλονίκη
description: The present thesis comprises a reference to the practice of curating, as it has evolved historically and is currently being applied to contemporary art exhibitions and the role of the curator. Subsequently, a review of the exhibition entitled "Tasos Mantzavinos. My power is mastered in sickness" is being presented, which took place in 2012 at the Benaki Museum in Athens (curated by Elizabeth Plessas, architectural design by Stamatis Zannos). In the last part of the thesis, the conceptual museological planning is presented for a new exhibition by Tassos Mantzavinos at the Macedonian Museum of Contemporary Art in Thessaloniki
description: Σε συνεργασία με : Παιδαγωγικό Δημοτικής Εκπαίδευσης (Πανεπιστήμιο Δυτικής Μακεδονίας)
Epidemiologie von COVID-19 im Schulsetting
Creators: name: Buchholz, Udo
name: Lehfeld, Ann-Sophie
name: Otte Im Kampe, Eveline
name: Lindahl, Merete
name: Lewandowsky, Marina
name: Hauer, Barbara
name: Pozo Martin, Francisco
name: El Bcheraoui, Charbel
name: Hanefeld, Johanna
name: Haas, Walter
Publisher: name: Robert Koch-Institut
Year: 2021
Subjects: subject: COVID-19
subject: Meldedaten
subject: Schulausbrüche
subject: Kinder und Jugendliche
subject: akute Atemwegserkrankungen
subject: 610 Medizin und Gesundheit

description: Das Verständnis der Bedeutung von Kindern und Jugendlichen für das epidemiologische Geschehen der COVID-19-Pandemie ist wichtig, damit sich Maßnahmen daran orientieren können. Nun wurde untersucht, wie häufig Schülerinnen und Schülern zwischen 6 und 20 Jahren mit SARS-CoV-2 infiziert sind und wie oft es zu Schulausbrüchen kommt. Basierend auf publizierten Modellberechnungen wurde ebenfalls untersucht, welche infektionsepidemiologischen Folgen bei Wiedereröffnung der Schulen zu erwarten sind. Wie die Meldedaten im beobachteten Zeitraum zeigen, stiege die Inzidenzen in den jüngeren Altersgruppen – bis etwa 15 Jahre - erst dann, als sie schon mehrere Wochen bei den jüngeren Erwachsenen erhöht waren. Entgegen des Ausbreitungsprofils bei anderen Atemwegserregern scheint also im aktuellen pandemischen Geschehen keine substanzielle treibende Kraft von diesen Altersgruppen auszugehen, obgleich auch hier Übertragungen stattfinden und Ausbruchsgeschehen wirksam verhindert werden müssen. Etwaige Maßnahmen wie Schließungen und Wiedereröffnungen sollten unbedingt in den Kontext der regionalen Gesamtinzidenz in der Bevölkerung gesetzt werden, und in der Reihenfolge nach Altersgruppen priorisiert erfolgen.
Additional file 1: of Transcriptomic analysis reveals that enterovirus F strain SWUN-AB001 infection activates JNK/SAPK and p38 MAPK signaling pathways in MDBK cells
Creators: name: Zhang, Bin
name: Chen, Xinnuo
name: Yue, Hua
name: Ruan, Wenqiang
name: Qin, Sinan
name: Tang, Cheng
Publisher: name: figshare
Year: 2018
Subjects: subject: Microbiology
subject: FOS: Biological sciences
subject: Cell Biology
subject: Genetics
subject: Molecular Biology
subject: Biological Sciences not elsewhere classified
subject: Developmental Biology
subject: Infectious Diseases
subject: FOS: Health sciences
subject: Virology

description: Table S1. Sequences of the PCR primers used in this study. (DOCX 16 kb)
Baryogenesis via relativistic bubble walls
Creators: name: Azatov, Aleksandr
name: Vanvlasselaer, Miguel
name: Yin, Wen
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We present a novel mechanism which leads to the baryon asymmetry generation during the strong first order phase transition. If the bubble wall propagates with ultra-relativistic velocities, it has been shown that it can produce states much heavier than the scale of the transition and that those states are then out-of-equilibrium. In this paper, we show that the production mechanism can also induce CP-violation at one-loop level. We calculate those CP violating effects during the heavy particle production and show, that combined with baryon number violating interactions, those can lead to successful baryogenesis. Two models based on this mechanism are constructed and their phenomenology is discussed. Stochastic gravitational wave signals turn out to be generic signatures of this type of models.
description: 20 pages + appendix, 5 figures, references added, typos corrected, CP violation in decay taken into account, JHEP version
Cultural Content in the Digital Era
Creators: name: Μακραντωνάκη, Στυλιανή-Ζωή Νικολάου
Publisher: name: Aristotle University of Thessaloniki
Year: 2017
Subjects: Πολιτισμική Βιομηχανία
Πνευματική Ιδιοκτησία
Ροή δεδομένων
Cultural Industry
Copyright
Streaming

description: The assignment aimed to study the consumption of the cultural content in the digital era. We examined the history of the creation of the cultural content as it has been changed and enriched through the evolution of technology in combination with the legal frame and the boundaries it sets. We conducted a historical review of the Media of Mass Communication as they evolve until today in order to find the latest way of cultural consumption, which is streaming. At the same time we pointed out the new business models of cultural consumption as they become more vertical units of cultural production, promotion, advertising and consumption moving the profits from the tangible goods to the intangible. Through the Media review we presented the culture of consumption in relation to free and paid cultural content, as the cultural industry is seeking for new ways to profit from every consumption of the cultural content that was ever created, since personified consumption through the computer or the mobile offers that possibility. The future of services such as YouTube seems ominous. We concluded that the new model that the cultural industry is trying to impose is the repeated charge for each consumption of cultural products either directly to the consumer or the service that offers it.
description: Σκοπός της εργασίας ήταν η μελέτη κατανάλωσης του πολιτιστικού περιεχομένου στην ψηφιακή εποχή. Εξετάσαμε την ιστορία της δημιουργίας του πολιτιστικού περιεχομένου όπως μεταβλήθηκε και εμπλουτίστηκε μέσα από την εξέλιξη της τεχνολογίας σε συνδυασμό με το νομικό πλαίσιο και τους περιορισμούς που θέτει. Κάναμε μια ιστορική ανασκόπηση των ΜΜΕ όπως εξελιχθήκαν μέχρι σήμερα ώστε να καταλήξουμε στον τελευταίο τρόπο κατανάλωσης πολιτιστικού περιεχομένου που είναι το streaming (ροή δεδομένων). Παράλληλα είδαμε τα νέα επιχειρηματικά μοντέλα της πολιτιστικής βιομηχανίας καθώς γίνονται πλέον κάθετες μονάδες παραγωγής, προώθησης, διαφήμισης και κατανάλωσης πολιτιστικού περιεχομένου με μετατόπιση του κέρδους από τα υλικά αγαθά στα άυλα του διαδικτύου. Μέσα από την ανασκόπηση των ΜΜΕ επισημάνθηκε η κουλτούρα κατανάλωσης σχετικά με το πολιτιστικό περιεχόμενο που παρέχεται δωρεάν και αυτό για το οποίο πληρώνουν οι χρήστες, καθώς αυτή τη στιγμή η πολιτιστική βιομηχανία ψάχνει τρόπους για να εξαργυρώνει από κάθε κατανάλωση πολιτιστικού προϊόντος από την δημιουργία του μέχρι σήμερα, αφού η προσωποποιημένη κατανάλωση μέσω του υπολογιστή ή του κινητού προσφέρει αυτήν την δυνατότητα. Το μέλλον υπηρεσιών όπως το youΤube φαίνεται δυσοίωνο και διαπιστώσαμε ότι το νέο μοντέλο που προσπαθεί η πολιτιστική βιομηχανία να επιβάλλει είναι η επαναλαμβανόμενη χρέωση για κάθε κατανάλωση πολιτιστικού προϊόντος είτε απευθείας στον καταναλωτή ή στην υπηρεσία που το προσφέρει.
Significant H I and Metal Differences around the z = 0.83 Lens Galaxy Towards the Doubly Lensed Quasar SBS 0909+532
Creators: name: Cashman, Frances H.
name: Kulkarni, Varsha P.
name: Lopez, Sebastian
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We report a large difference in neutral hydrogen (H I) and metal column densities between the two sight lines probing opposite sides of the lensing galaxy at $z_\mathrm{lens}$ = 0.83 toward the doubly lensed quasar SBS 0909+532. Using archival HST-STIS and Keck HIRES spectra of the lensed quasar images, we measure log $N_\mathrm{H\;I}$ = 18.77 $\pm$ 0.12 cm$^{-2}$ toward the brighter image ($A$) at an impact parameter of $r_A$ = 3.15 kpc and log $N_\mathrm{H\;I}$ = 20.38 $\pm$ 0.20 cm$^{-2}$ toward the fainter image ($B$) at an impact parameter of $r_B$ = 5.74 kpc. This difference by a factor of $\sim$41 is the highest difference between sight lines for a lens galaxy in which H I has been measured, suggesting patchiness and/or anisotropy on these scales. We estimate an average Fe abundance gradient between the sight lines to be $\geq$ +0.35 dex kpc$^{-1}$. The $N_\mathrm{Fe\;II}$/$N_\mathrm{Mg\;II}$ ratios for the individual components detected in the Keck HIRES spectra have supersolar values for all components in sight line $A$ and for 11 out of 18 components in sight line $B$, suggesting that Type Ia supernovae may have contributed to the chemical enrichment of the galaxy's environment. Additionally, these observations provide complementary information to detections of cold gas in early-type galaxies and the tension between these and some models of cloud survival.
description: 20 pages, 6 tables, 11 figures
Revealing Gravitational Collapse in Serpens G3-G6 Molecular Cloud using Velocity Gradients
Creators: name: Hu, Yue
name: Lazarian, A.
name: Stanimirovic, Snezana
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The relative role of turbulence, magnetic fields, self-gravity in star formation is a subject of intensive debate. We present IRAM 30m telescope observations of the $^{13}$CO (1-0) emission in the Serpens G3-G6 molecular cloud and apply to the data a set of statistical methods. Those include the probability density functions (PDFs) of column density and the Velocity Gradients Technique (VGT). We combine our data with the Planck 353 GHz polarized dust emission observations, Hershel H$_2$ column density. We suggest that the Serpens G3-G6 south clump is undergoing a gravitational collapse. Our analysis reveals that the gravitational collapse happens at volume density $n\ge10^3$ $\rm cm^{-3}$. We estimate the plane-of-the-sky magnetic field strength of approximately 120 $μG$ using the traditional Davis-Chandrasekhar-Fermi method and 100 $μG$ using a new technique proposed in Lazarian et al.(2020). We find the Serpens G3-G6 south clump's total magnetic field energy significantly surpasses kinetic energy and gravitational energy. We conclude that the gravitational collapse could be successfully triggered in a supersonic and sub-Alfvénic cloud.
description: 17 pages,11 figures, accepted for publication in ApJ
Lyman alpha emission in high-redshift galaxies
Creators: name: Tapken, C.
name: Appenzeller, I.
name: Noll, S.
name: Richling, S.
name: Heidt, J.
name: Meinkoehn, E.
name: Mehlert, D.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: A significant fraction of the high-redshift galaxies show strong Lyman emission lines. For redshifts z>5, most known galaxies belong to this class. However, so far not much is known about the physical structure and nature of these objects. Our aim is to analyse the Lyman alpha emission in a sample of high-redshift UV-continuum selected galaxies and to derive the physical conditions that determine the Lyman alpha profile and the line strength. VLT/FORS spectra with a resolution of R ~ 2000 of 16 galaxies in the redshift range of z = 2.7 to 5 are presented. The observed Lyman alpha profiles are compared with theoretical models. The Lyman alpha lines range from pure absorption (EW = -17 Angstroem) to strong emission (EW = 153 Angstroem). Most Lyman alpha emission lines show an asymmetric profile, and three galaxies have a double-peaked profile. Both types of profiles can be explained by a uniform model consisting of an expanding shell of neutral and ionised hydrogen around a compact starburst region. The broad, blueshifted, low-ionisation interstellar absorption lines indicate a galaxy-scale outflow of the ISM. The strengths of these lines are found to be determined in part by the velocity dispersion of the outflowing medium. We find star-formation rates of these galaxies ranging from SFR(UV) = 1.2 to 63.2 Msun uncorrected for dust absorption. The Lyman alpha emission strength of our target galaxies is found to be determined by the amount of dust and the kinematics of the outflowing material.
description: 11 pages, 6 figures. A&A accepted
Bootstrapping octagons in reduced kinematics from $A_2$ cluster algebras
Creators: name: He, Song
name: Li, Zhenjie
name: Tang, Yichao
name: Yang, Qinglin
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Multi-loop scattering amplitudes/null polygonal Wilson loops in ${\mathcal N}=4$ super-Yang-Mills are known to simplify significantly in reduced kinematics, where external legs/edges lie in an $1+1$ dimensional subspace of Minkowski spacetime (or boundary of the $\rm AdS_3$ subspace). Since the edges of a $2n$-gon with even and odd labels go along two different null directions, the kinematics is reduced to two copies of $G(2,n)/T \sim A_{n{-}3}$. In the simplest octagon case, we conjecture that all loop amplitudes and Feynman integrals are given in terms of two overlapping $A_2$ functions (a special case of two-dimensional harmonic polylogarithms): in addition to the letters $v, 1+v, w, 1+w$ of $A_1 \times A_1$, there are two letters $v-w, 1- v w$ mixing the two sectors but they never appear together in the same term; these are the reduced version of four-mass-box algebraic letters. Evidence supporting our conjecture includes all known octagon amplitudes as well as new computations of multi-loop integrals in reduced kinematics. By leveraging this alphabet and conditions on first and last entries, we initiate a bootstrap program in reduced kinematics: within the remarkably simple space of overlapping $A_2$ functions, we easily obtain octagon amplitudes up to two-loop NMHV and three-loop MHV. We also briefly comment on the generalization to $2n$-gons in terms of $A_2$ functions and beyond.
description: 26 pages, several figures and tables, an ancilary file
Spectral graph theory and deep learning on graphs
Creators: name: Καραλιάς, Νικόλαος Αθανασίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2017
Subjects: Φασματική θεωρία γράφημάτων
Βαθειά μάθηση
Συνέλιξη σε γράφημα
Spectral graph theory
Deep learning
Graph convolution

description: Μια σημαντική πρόκληση σε προβλήματα μηχανικής μάθησης είναι η εκμάθηση ουσιωδών αναπαραστάσεων που περιέχουν τις απαραίτητες πληροφορίες για την επίτευξη ενός δεδομένου στόχου. Τα νευρωνικά δίκτυα επικεντρώνοντε στην εκμάθηση παραμέτρων με βάση την επιτυχημένη αναπαράσταση των δειγμάτων ενός συνόλου από δεδομένα. Ο στόχος μας είναι να μάθουμε αναπαραστάσεις που συνδυάζουν τα ατομικά χαρακτηριστικά ενός δείγματος και τις σχέσεις του με άλλα δείγματα με τη χρήση της συνέλιξης πάνω σε γράφημα. Χρησιμοποιούμε μεθόδους και εργαλεία απο το ανερχώμενο πεδίο της βαθειάς μάθησης σε γραφήματα για να το πετύχουμε αυτό. Τα μοντέλα μας υλοποιούν προσεγγίσεις της φασματικής εκδοχής της συνέλιξης σε γράφημα, σε γραφήματα που ορίζονται σε ομάδες δειγμάτων του συνόλου δεδομένων. Καταφέρνουμε να πετύχουμε καλύτερες επιδόσεις από τις τυπικές αρχιτεκτονικές συνελικτικών δικτύων σε προβλήματα ταξινόμησης εικόνων.
description: A significant challenge in machine learning problems is learning meaningful repre- sentations that encode all the information that is relevant to a given task. Neural networks focus on learning parameters based on the ability to successfully represent individual samples of a dataset. Our goal is to learn representations that combine a sample’s individual characteristics and its relationships with other samples by uti- lizing the concept of the graph convolution. We employ methods and tools from the emerging field of deep learning on graphs to achieve that. Our models implement approximations to the graph spectral definition of the graph convolution, on graphs defined over batches of the dataset. We report better performance than regular convolutional networks on image classification tasks.
Additional file 4: of The combination of bFGF and CHIR99021 maintains stable self-renewal of mouse adult retinal progenitor cells
Creators: name: Jin, Caixia
name: Ou, Qingjian
name: Li, Zongyi
name: Wang, Juan
name: Zhang, Jieping
name: Tian, Haibin
name: Xu, Jing-Ying
name: Gao, Furong
name: Lu, Lixia
name: Xu, Guo-Tong
Publisher: name: figshare
Year: 2018
Subjects: subject: Biochemistry
subject: Cell Biology
subject: Molecular Biology
subject: Immunology
subject: FOS: Clinical medicine
subject: Developmental Biology
subject: Cancer
subject: Hematology

description: Figure S3. bFGF can activate the canonical Wnt pathway. (a) The western blot results showed that bFGF can activate the canonical Wnt pathways and caused β-catenin phosphorylation at the S33/37/T41, S675, and S552 sites. The results are representative of at least three independent experiments, and representative blots are shown. (b) The co-immunostaining of NFAT1 and KI67 on the 7th day of the cells with BM, B, C, and BC medium. Magnification, × 200; Scale bar, 50 μm. (c) KI67 positive cells were quantified on the 7th day with BM, B, C, and BC medium. The results showed KI67 positive ratio in BM (17.83 ± 0.32%), B (58.08 ± 2.81%), C (19.96 ± 2.35%), and BC (64.19 ± 5.27%). Data are presented as mean ± SD (n = 3). ***P < 0.001 (one-way ANOVA and Sidak’s multiple comparisons test). (PDF 11714 kb)
Duality and the vibrational modes of a Cooper-pair Wigner crystal
Creators: name: Pereg-Barnea, T.
name: Franz, M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: When quantum fluctuations in the phase of the superconducting order parameter destroy the off-diagonal long range order, duality arguments predict the formation of a Cooper pair crystal. This effect is thought to be responsible for the static checkerboard patterns observed recently in various underdoped cuprate superconductors by means of scanning tunneling spectroscopy. Breaking of the translational symmetry in such a Cooper pair Wigner crystal may, under certain conditions, lead to the emergence of low lying transverse vibrational modes which could then contribute to thermodynamic and transport properties at low temperatures. We investigate these vibrational modes using a continuum version of the standard vortex-boson duality, calculate the speed of sound in the Cooper pair Wigner crystal and deduce the associated specific heat and thermal conductivity. We then suggest that these modes could be responsible for the mysterious bosonic contribution to the thermal conductivity recently observed in strongly underdoped ultraclean single crystals of YBCO tuned across the superconductor-insulator transition.
description: 14 pages; 3 figures; corrected the sample size value; version 3 to appear in PRB
How International is Academic Knowledge Production? Social Sciences and Humanities in Eastern Africa from a European Perspective
Creators: name: Schmidt, Nora
Publisher: name: Zenodo
Year: 2016
Subjects: Scholarly communication
International academia
Social Sciences and Humanities in Eastern Africa

description: This poster outlines my PhD project: in Information Studies, research on the production of academic knowledge taking Postcolonial Theory into account is rare. Social Sciences and Humanities (SSH) research conducted in Eastern Africa is almost invisible to scholars situated in Europe. Throughout this PhD project, I question if the label “international academia” is adequate for the social structure denoted by it. The four individual papers of the project will shed light on selected aspects of the title-giving overarching question. For paper 1 and 2, I make use of bibliometric methods to describe the East-African SSH publishing system. Paper 3 maps self-descriptions of the academic knowledge production in the selected field. The final paper questions how organisational decisions relying on notions of "international academia" shape the analysed publishing system and knowledge production.
Οικονομική στασιμότητα στα Βαλκάνια: οι ρίζες και οι αιτίες του φαινομένου
Creators: name: Μακόγλου, Μιχαήλ Ευσταθίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2017
Subjects: Βαλκάνια
Οικονομία
Οικονομική στασιμότητα
Balkans
Economy
Economic Stagnation

description: Σκοπός της παρούσας μελέτης είναι να ερευνήσει το φαινόμενο της οικονομικής στασιμότητας στην περιοχή των Βαλκανίων. Συγκεκριμένα, η εργασία επιδιώκει να φωτίσει τις αιτίες που οδήγησαν τα βαλκανικά κράτη στη σημερινή τους οικονομική κατάσταση, μια κατάσταση «ενδιάμεσης θέσης» μεταξύ της «προηγμένης Δύσης» και του «Τρίτου Κόσμου». Μέσω της σύγκρισης των οικονομικών μεγεθών των βαλκανικών κρατών με αυτών του μέσου όρου της Ευρωπαϊκής Ένωσης, και ερευνώντας τις ρίζες των προσπαθειών συγκρότησης οικονομιών στα Βαλκάνια, επιχειρείται η εξαγωγή χρήσιμων συμπερασμάτων για την περιοχή. Εν τέλει, η εργασία παρέχει μια σαφή εικόνα για τον τρόπο που εξελίχθηκαν οι βαλκανικές οικονομίες και απαντά στο ερώτημα του γιατί δεν κατόρθωσαν τα βαλκανικά κράτη να δημιουργήσουν ισχυρές οικονομίες.
description: The aim of the present paper is to examine the phenomenon of economic stagnation in the region of the Balkans. More specifically, the paper aims to shed a light to the causes that led the Balkan states to their present economic status, that of an intermediate economy between the “progressive West” and the “Third World”. Through the comparison between the financial indicators of the Balkan states and those of the average of the European Union, as well as through the examination of the roots of the Balkan economies, the study provides useful answers to the posed questions. In the end, the paper presents an accurate overview of the way the Balkan economies were evolved and answers the question of why were the Balkan states unsuccessful in forming strong economies.
Spin-glass behavior in Shastry-Sutherland lattice of Tm$_\textbf{2}$Cu$_\textbf{2}$In
Creators: name: Sahu, Baidyanath
name: Fobasso, R. Djoumessi
name: Strydom, Andre M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The spin-glass behavior in the ferromagnetic phase of $\mathrm{Tm_2Cu_2In}$ was investigated by dc-, ac-magnetization, and non-equilibrium dynamics characterizations. Arc-melted polycrystalline compound of $\mathrm{Tm_2Cu_2In}$ crystallizes in $\mathrm{Mo_2FeB_2}$-type tetragonal structure (space group $P_4/mbm$). The temperature variation dc-magnetization exhibits a ferromagnetic behavior with Curie temperature $T_C$ = 32.5 K. The zero-field cooled (ZFC) and field cooled (FC) magnetic curves show a thermomagnetic irreversible behavior below $T_C$. The field dependence of irreversible temperature follows Almeida-Thouless line. The frequency and ac-driven field-dependent anomalies in ac-susceptibility results indicate the existence of spin-glass state in $\mathrm{Tm_2Cu_2In}$. The time dependence of magnetization further supports the spin-glass behavior observed in $\mathrm{Tm_2Cu_2In}$. The frequency dependence of the freezing temperature in the real part of ac-susceptibility has been analyzed on the basis power-law divergence and Vogel-Fulcher law. The obtained results revealed that $\mathrm{Tm_2Cu_2In}$ belongs to a ferromagnetic canonical spin-glass class of compounds.
Οι ανακοπές των μερών στην κατάσχεση στα χέρια τρίτου
Creators: name: Σέμπρου, Μαρία Χρήστου
Publisher: name: Aristotle University of Thessaloniki
Year: 2017
Subjects: Αναγκαστική εκτέλεση
Κατάσχεση στα χέρια τρίτου
Ανακοπές των μερών
Civil enforcement procedure
Attachment to a third party’s hands
Parties’ objections

description: Θέμα της παρούσας διπλωματικής εργασίας αποτελεί η κατάσχεση εις χείρας τρίτου, και ειδικότερα, ζητήματα που αφορούν στις ανακοπές των προσώπων που λαμβάνουν μέρος σε αυτήν, δηλαδή του επισπεύδοντος δανειστή, του καθ’ ου η εκτέλεση οφειλέτη και του τρίτου, των οποίων ζητημάτων επιχειρείται η μελέτη και παρουσίαση. Για την πληρότητα της μελέτης κρίθηκε αναγκαία η γενική αναφορά σε ζητήματα της κατασχέσεως εις χείρας τρίτου. Επιπλέον, μετά την ενασχόληση με τις κατ’ ιδίαν ανακοπές των μερών, θα γίνει αναφορά στην παροχή προσωρινής δικαστικής προστασίας προς τον καθ’ ου η εκτέλεση οφειλέτη από την επισπευδόμενη εκτέλεση και στα ειδικότερα προβλήματα που αυτή παρουσιάζει, ιδίως μετά την κατάργηση του άρθρου 938 ΚΠολΔ με το ν. 4335/2015 και την αδυναμία αναστολής της εκτελεστικής διαδικασίας στην έμμεση εκτέλεση.
description: The subject of this thesis is the attachment to a third party’ s hands and, in particular, issues relating to parties’ objections, namely the creditor’ s, the debtor’ s and the third party’ s, issues whose study and presentation are attempted. For the completeness of the study, it was necessary to refer generically to issues of attachment to a third party’s hands. In addition, after dealing with the parties' individual objections, reference will be made to the provision of temporary judicial protection to the debtor against the expedited civil enforcement procedure and the specific problems it presents, especially after the abolition of Article 938 of the Code of Civil Procedure by Law 4335/2015 and the impossibility of suspending the civil enforcement procedure in indirect execution.
Cross directional control of basis weight on paper machines using Gram polynomials
Creators: name: Kristinsson, Kristinn
Publisher: name: University of British Columbia
Year: 2009

description: In this thesis a control algorithm for cross-directional basis weight control based on orthogonal polynomials is presented. Instead of controlling the cross-directional values at each point, the parameters of the orthogonal polynomials are controlled, taking into account the maximum bending moment of the slice lip and the relative stiffness of the slice with respect to the actuators. Problems with slice lip bending are dealt with in two ways. Implicitly, by modelling it as a polynomial such that the slice is not bent more than the highest degree of the polynomial, which is chosen beforehand. Explicitly, by calculating the bending moment and then use quadratic programming to limit the bending moment. By modeling the measurements and the actuators positions by polynomials the mapping between the actuators and the sensors, which is the key element of the current control systems, is effectively eliminated. Computational requirements are greatly reduced by avoiding inverses of big matrices.
Thermodynamic Behavior of Friedmann Equation at Apparent Horizon of FRW Universe
Creators: name: Akbar, M.
name: Cai, Rong-Gen
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: It is shown that the differential form of Friedmann equation of a FRW universe can be rewritten as a universal form $dE = TdS + WdV$ at apparent horizon, where $E$ and $V$ are the matter energy and volume inside the apparent horizon (the energy $E$ is the same as the Misner-Sharp energy in the case of Einstein general relativity), $W=(ρ-P)/2$ is the work density and $ρ$ and $P$ are energy density and pressure of the matter in the universe, respectively. From the thermodynamic identity one can derive that the apparent horizon has associated entropy $S= A/4G$ and temperature $T = κ/ 2π$ in Einstein general relativity, where $A$ is the area of apparent horizon and $κ$ is the surface gravity at apparent horizon. We extend our procedure to the Gauss-Bonnet gravity and more general Lovelock gravity and show that the differential form of Friedmann equations in these gravities can also be rewritten to thee universal form $dE = TdS + WdV$ at the apparent horizon with entropy $S$ being given by expression previously known via black hole thermodynamics.
description: v4: Revtex, 18 pages, to appear in PRD
Καταγραφή και αξιοποίηση δασικών κατασκευών - γεφυρών για την ανάδειξη πράσινων διαδρομών εντός του περιαστικού δάσους Θεσσαλονίκης
Creators: name: Πατάρης, Αναστάσιος Παναγιώτη
Publisher: name: Aristotle University of Thessaloniki
Year: 2017
Subjects: Πράσινες διαδρομές
Δασικές κατασκευές
Μονοπάτια
Greenways
Forests constructions
Pathways

description: Η παρούσα μεταπτυχιακή διατριβή «Καταγραφή και αξιοποίηση δασικών κατασκευών - γεφυρών για την ανάδειξη πράσινων διαδρομών εντός του περιαστικού δάσους Θεσσαλονίκης», έχει σκοπό να προτείνει δραστηριότητες αναψυχής για τους κατοίκους και όχι μόνο, της Θεσσαλονίκης. Η φύση και το αστικό περιβάλλον βρίσκονται σε μία αέναη σχέση και αλληλουχία. Οι δραστηριότητες του ανθρώπου ήταν άρρηκτα συνδεδεμένες με το γύρω φυσικό περιβάλλον. Οι χώροι αστικού πρασίνου εκτός από στοιχεία του αστικού τοπίου, διαδραματίζουν ζωτικό ρόλο στην κοινωνικοοικονομική ανάπτυξη και βιωσιμότητα των πόλεων. Ο σχεδιασμός και η διαχείριση αυτών των χώρων αποτελεί μια πολύπλοκη και δύσκολη διαδικασία η οποία εξαρτάται από πολλούς παράγοντες. Έτσι λοιπόν, κρίνεται απαραίτητη η δημιουργία δραστηριοτήτων αναψυχής με σκοπό τη βελτίωση της ποιότητας της αστικής ζωής. Καταγράφηκαν οι υπάρχουσες Δασικές κατασκευές και γέφυρες και κατόπιν μελέτης και αξιολόγησης του Περιαστικού Δάσους Θεσσαλονίκης προτάθηκαν τέσσερα μονοπάτια για αναψυχή ευρωπαϊκών προδιαγραφών με το μικρότερο δυνατό κόστος. Τα μονοπάτια αυτά μπορούν να χρησιμοποιηθούν και ως ποδηλατοδρόμοι. Σε κάθε μονοπάτι επισημάνθηκαν οι θέσεις θέας και προτάθηκαν κιόσκια και τραπεζόπαγκοι με σκοπό την καλύτερη εξυπηρέτηση των επισκεπτών.
description: The main aim of this Master Thesis research: “Data Base recording and utilization of forests constructions and bridges in order to highlight the greenways of Suburban Forest of Thessaloniki”, is to provide greenways of the Suburban Forest of Thessaloniki and to suggest recreational activities for the residents. Nature and urban environment are in a perpetual relationship and sequence. Human activities were connected with the natural environment. Urban green spaces play a basic and a vital role in the socio-economic development and viability of cities. The design and management of these sites is a difficult process that depends on many factors. Therefore a data base with the existing forest constructions and bridges were recorded and after the study and evaluation of the Suburban Forest of Thessaloniki it was aimed as necessary to be created recreational activities; in order to improve the quality of urban life. Following the study and evaluation of the Suburban Forest of Thessaloniki, four paths were proposed for recreation under European specifications at a low cost budget. These trails can also be used as bicycle paths. On each path, the viewpoints were highlighted. Also, kiosks and tables were proposed in order to better the services for the visitors.
TeV Scale Resonant Leptogenesis with $L_μ-L_τ$ Gauge Symmetry in the Light of Muon $(g-2)$
Creators: name: Borah, Debasish
name: Dasgupta, Arnab
name: Mahanta, Devabrat
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: Motivated by the growing evidence for the possible lepton flavour universality violation after the first results from Fermilab's muon $(g-2)$ measurement, we revisit one of the most widely studied anomaly free extensions of the standard model namely, gauged $L_μ-L_τ$ model, to find a common explanation for muon $(g-2)$ as well as baryon asymmetry of the universe via leptogenesis. The minimal setup allows TeV scale resonant leptogenesis satisfying light neutrino data while the existence of light $L_μ-L_τ$ gauge boson affects the scale of leptogenesis as the right handed neutrinos are charged under it. For $L_μ-L_τ$ gauge boson mass at GeV scale or above, the muon $(g-2)$ favoured parameter space is already ruled out by other experimental data while bringing down its mass to sub-GeV regime leads to vanishing lepton asymmetry due to highly restrictive structures of lepton mass matrices at the scale of leptogenesis. Extending the minimal model with two additional Higgs doublets can lead to a scenario consistent with successful resonant leptogenesis and muon $(g-2)$ while satisfying all relevant experimental data.
description: 11 pages, 7 captioned figures, accepted in Physical Review D
The role of family support during childhood on self-protection and reproductive motives in adults during the Covid-19 pandemic in Brazil: an exploratory study
Creators: name: Tasso, Natália
name: Castro, Felipe Nalon
Publisher: name: OSF Registries
Year: 2023
Subjects: subject: Behavior and Ethology
subject: Life Sciences
subject: Ecology and Evolutionary Biology
subject: Biology
subject: Fundamental social motives
subject: Harshness
subject: Life history theory
subject: Pandemic
subject: Unpredictability

description: Data and script for the analysis of a paper that is part of an ongoing doctoral thesis by Tasso (2023).
Seething Horizontal Magnetic Fields in the Quiet Solar Photosphere
Creators: name: Harvey, J. W.
name: Branston, D.
name: Henney, C. J.
name: Keller, C. U.
name: Team, the SOLIS
name: Team, the GONG
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The photospheric magnetic field outside of active regions and the network has a ubiquitous and dynamic line-of-sight component that strengthens from disk center to limb as expected for a nearly horizontal orientation. This component shows a striking time variation with an average temporal rms near the limb of 1.7 G at ~3" resolution. In our moderate resolution observations the nearly horizontal component has a frequency variation power law exponent of -1.4 below 1.5 mHz and is spatially patchy on scales up to ~15 arcsec. The field may be a manifestation of changing magnetic connections between eruptions and evolution of small magnetic flux elements in response to convective motions. It shows no detectable latitude or longitude variations.
description: 7 pages, 6 figures, submitted to ApJ letters, quality of figures significantly degraded here by compression requirements
Absorption Cross Section of Smeared D3-Brane on a Circle
Creators: name: Psinas, Anastasios
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The evaluation of the absorption cross section of a massless scalar field propagating on a non-extremal black D3-brane smeared on a circle is considered. The solution to the scalar field equation of motion at high temperature is obtained in terms of the parameters $λ=3ω/4πT$ and $k$, which denote the frequency and the momentum along the circle respectively while $T$ denotes the temperature of the black brane. Based on a perturbative scheme, higher order temperature corrections to the scalar absorption cross section are computed. Further, interesting analogies with the cross section of known black branes solutions are discussed.
description: 13 pages; v2 errors in the absorption cross section formulas corrected, few typos corrected, improved discussion regarding our results, version to appear in JHEP
Modeling, analysis and dynamics of the human jaw system
Creators: name: Ng, Francis Wai-Tsuen
Publisher: name: University of British Columbia
Year: 2009

description: This thesis deals with the modeling of the human jaw system. The model is a computer model in which the nine pairs of facial muscles and the jaw itself are represented. The study leading up to the model includes expressive Object-Oriented Programming (OOP) to encode the computer model. Different components in the jaw system are defined as objects and used as building blocks of the system. Although the studies in the thesis are confined to the human jaw system, various components of the model are designed to permit continuous modification. Direct measurements of muscles’ activities are always invasive, or even impossible to measure. A dynamic simulation model offers research workers a frame to improve the concept of the matters involved before measurements are made. Lastly, a jaw model can/may gives insight into how patients will recover from facial and muscle injuries. Studies of the behavior of other biological systems have been made to discover methods in which an artificial neural network (ANN) may contribute solutions to the dynamic control problem. Some useful results have been obtained which may indicate how ANN could be incorporated in the dynamic jaw model of the future. The work is interdisciplinary involving the following fields: dynamic behavior of muscle; dynamic behavior of biological system; mechanical system simulation; and ANN.
Simulating highly-eccentric common envelope jets supernova (CEJSN) impostors
Creators: name: Schreier, Ron
name: Hillel, Shlomi
name: Shiber, Sagiv
name: Soker, Noam
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We conduct three-dimensional hydrodynamical simulations of eccentric common envelope jets supernova (CEJSN) impostors, i.e., a neutron star (NS) that crosses through the envelope of a red supergiant star on a highly eccentric orbit and launches jets as it accretes mass from the envelope. Because of numerical limitations we apply a simple prescription where we inject the assumed jets' power into two opposite conical regions inside the envelope. We find the outflow morphology to be very complicated, clumpy, and non-spherical, having a large-scale symmetry only about the equatorial plane. The outflow morphology can substantially differ between simulations that differ by their jets' power. We estimate by simple means the light curve to be very bumpy, to have a rise time of one to a few months, and to slowly decay in about a year to several years. These eccentric CEJSN impostors will be classified as `gap' objects, i.e., having a luminosity between those of classical novae and typical supernovae (termed also ILOTs for intermediate luminosity optical transients). We strengthen a previous conclusion that CEJSN impostors might account for some peculiar ILOTs, in particular those that might repeat over timescales of months to years.
description: Accepted for publication in MNRAS
The Accelerated Expansion of the Universe Challenged by an Effect of the Inhomogeneities. A Review
Creators: name: Célérier, Marie-Noëlle
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Since its decovery during the late 90's, the dimming of distant SN Ia apparent luminosity has been mostly ascribed to the influence of a mysterious dark energy component. Formulated in a Friedmannian cosmological modelling framework based upon the cosmological ``principle'' hypothesis, this interpretation has given rise to the ``concordance'' model. However, a caveat of such a reasoning is that the cosmological ``principle'' derives from a philosophical Copernican assumption and has never been tested. Furthermore, a weakness of its conclusion, i. e., the existence of a negative-pressure fluid or a cosmological constant, is that it would have profound implications for the current theories of physics. This is why we have proposed a more conservative explanation, ascribing the departure of the observed universe from an Einstein-de Sitter model to the influence of inhomogeneities. This idea has been independently developed by other authors and further enlarged to the reproduction of different cosmological data. We review here the main proposals which have been put forward to deal with this purpose and present some prospects for future developments.
description: 21 pages, minor changes to match the final published version
Active Speaker Detection as a Multi-Objective Optimization with Uncertainty-based Multimodal Fusion
Creators: name: Pouthier, Baptiste
name: Pilati, Laurent
name: Gudupudi, Leela K.
name: Bouveyron, Charles
name: Precioso, Frederic
Publisher: name: arXiv
Year: 2021
Subjects: subject: Sound (cs.SD)
subject: Computation and Language (cs.CL)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Audio and Speech Processing (eess.AS)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: It is now well established from a variety of studies that there is a significant benefit from combining video and audio data in detecting active speakers. However, either of the modalities can potentially mislead audiovisual fusion by inducing unreliable or deceptive information. This paper outlines active speaker detection as a multi-objective learning problem to leverage best of each modalities using a novel self-attention, uncertainty-based multimodal fusion scheme. Results obtained show that the proposed multi-objective learning architecture outperforms traditional approaches in improving both mAP and AUC scores. We further demonstrate that our fusion strategy surpasses, in active speaker detection, other modality fusion methods reported in various disciplines. We finally show that the proposed method significantly improves the state-of-the-art on the AVA-ActiveSpeaker dataset.
description: In INTERSPEECH 2021
Space- and time-like form factors for $ω\toπγ^*$ and $K^*\to Kγ^*$ in light-front quark model
Creators: name: Choi, Ho-Meoyng
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We investigate space- and time-like form factors for $ω\toπγ^*$ and $K^*\to Kγ^*$ decays using the light-front quark model constrained by the variational principle for the QCD-motivated effective Hamiltonian. The momentum dependent space-like form factors are obtained in the $q^+=0$ frame and then analytically continued to the time-like region. Our prediction for the time-like form factor $F_{ωπ}(q^2)$ is in good agreement with the experimental data. We also find that the space-like form factor $F_{K^{*\pm}K^{\pm}}(Q^2)$ for charged kaons encounters a zero because of the negative interference between the two currents to the quark and the antiquark.
description: 4pages, 4figures