cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Die Stellung von Advocacy und Public Anthropology in der Ethnologie - Engagement versus Wissenschaft oder zwei Seiten einer Medaille?
Creators: name: Schnüll, Petra
Publisher: name: Zenodo
Year: 2016
Subjects: Advocacy Anthropology
Public Anthropology
Social Anthropology
Cultural Anthropology
Master thesis

description: This master's thesis examines what characterizes advocacy anthropology and public anthropology, respectively, and how these more recent developments position themselves in relation to academically established anthropology and can or should influence it in the long run. In dieser Magisterarbeit wird untersucht, was die Advocacy Anthropology und die Public Anthropology jeweils charakterisiert und wie sich diese eher rezenten Entwicklungen zur akademisch etablierten Ethnologie positionieren und diese auf lange Sicht beeinflussen können oder sollten.
description: This master's thesis was written in 2016 and graded 1.7 (German grading system).
Spitzer Space Telescope study of disks in the young $σ$ Orionis cluster
Creators: name: Hernandez, Jesus
name: Hartmann, L.
name: Megeath, T.
name: Gutermuth, R.
name: Muzerolle, J.
name: Calvet, N.
name: Vivas, A. K.
name: Briceno, C.
name: Allen, L.
name: Stauffer, J.
name: Young, E.
name: Fazio, G.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We report new Spitzer Space Telescope observations from the IRAC and MIPS instruments of the young (~ 3 Myr) sigma Orionis cluster. We identify 336 stars as members of the cluster using optical and near-infrared color magnitude diagrams. Using the spectral energy distribution (SED) slopes in the IRAC spectral range, we place objects in several classes: non-excess stars, stars with optically thick disks(like classical T Tauri stars), class I (protostellar) candidates, and stars with ``evolved disks''; the last exhibit smaller IRAC excesses than optically thick disk systems. In general, this classification agrees with the location expected in IRAC-MIPS color-color diagrams for these objects. We find that the evolved disk systems are mostly a combination of objects with optically thick but non-flared disks, suggesting grain growth and/or settling, and transition disks, systems in which the inner disk is partially or fully cleared of small dust. In all, we identify 7 transition disk candidates and 3 possible debris disk systems. As in other young stellar populations, the fraction of disks depends on the stellar mass, ranging from ~10% for stars in the Herbig Ae/Be mass range (>2 msun) to ~35% in the T Tauri mass range (1-0.1 msun). We find that the disk fraction does not decrease significantly toward the brown dwarf candidates (<0.1 msun). The IRAC infrared excesses found in stellar clusters and associations with and without central high mass stars are similar, suggesting that external photoevaporation is not very important in many clusters. Finally, we find no correlation between the X-ray luminosity and the disk infrared excess, suggesting that the X-rays are not strongly affected by disk accretion.
description: 44pages, 17 figures. Sent to ApJ
title: Microplastics: effects on oyster physiology at adult and larval stages
Creators: name: Sussarellu, Rossana
name: Soudant, Philippe
name: Lambert, Christophe
name: Fabioux, Caroline
name: Corporeau, Charlotte
name: Laot, Charlotte
name: Le Goïc, Nelly
name: Quillien, Virgile
name: Daniel, Jean-Yves
name: Boudry, Pierre
name: Long, Marc
name: Mingant, Christian
name: Petton, Bruno
name: Maes, Thomas
name: Vethaak, Dick
name: Robbens, Johan
name: Huvet., Arnaud
Publisher: name: ASC 2013 - Theme session A
Year: 2024
Subjects: The sea and human culture and societies
Pressures, impacts, conservation, and management

description: No abstracts are to be cited without prior reference to the author. Plastics are persistent synthetic materials, which can accumulate in the marine environment, although the consequences of macroplastic debris for wildlife are well documented, the impacts of microplastics (MP) on marine life are still largely unknown. In this study a chronic exposure of adult Pacific oysters (Crassostrea gigas) to MP, during two months, was performed under controlled conditions using a mix of yellow-green fluorescent polystyrene MP (2 and 6 µm). The distribution and accumulation of the MP in oyster hemolymph and tissues was monitored using histology and flow cytometry. Appropriate experimental conditions were designed to induce gametogenesis and production of mature gametes in order to test the effects of MP on oyster reproduction, gamete quality and subsequent larval development. Physiological perturbations in adults were assessed by measuring ecophysiological behavior, growth, defense mechanisms and reproductive allocation. These measurements would help defining toxic endpoints and to guide future studies on the effects of MP on Pacific oyster physiology.
Parallel job scheduling performance in distributed server systems with varying workload using simulation:
Creators: name: Δανέζη, Ανατολή Αθανασίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2011
Subjects: Κατανεμημένα Συστήματα
Συγχρονισμός
Χρονοδρομολόγηση
Distributed systems
Concurrency
Scheduling

description: Στη παρούσα διατριβή, στόχος είναι η βελτιστοποίηση κατανεμημένων συστημάτων που υπόκεινται σε περιορισμούς που προκύπτουν από το διαμοιρασμό πόρων. Για το σκοπό αυτό διετελέστηκε μία μελέτη κάτω από το πρίσμα δύο διαφορετικών προσεγγίσεων: η πρώτη προσέγγιση είναι εμπειρική και στηρίζεται στη χρήση της τεχνικής Αρχιτεκτονικής Προσανατολισμένης στις Υπηρεσίες, ενώ η δεύτερη αφορά την ανάπτυξη προγράμματος Προσομοίωσης και Μοντελοποίησης σε Κατανεμημένο Σύστημα. Στην εμπειρική έρευνα χρησιμοποιήθηκε μια εφαρμογή απο τον τομέα Υπολογιστικής Δυναμικής Ρευστών που μετατράπηκε με δύο διακριτές μεθόδους σε εφαρμογή Παγκοσμίου Ιστού. Στην πρώτη μέθοδο, η εκτέλεση γίνεται σε μοναδικό εξυπηρέτη, ενώ στη δεύτερη η εκτέλεση γίνεται κατανεμημένα με δυνατότητα κλιμάκωσης σε οποιονδήποτε αριθμό εξυπηρετών. Σε κάθε περίπτωση σχεδιάστηκε επιπρόσθετα η ροή εργασιών με κατάλληλα λογισμικά εργαλεία για την αυτοματοποίηση του συστήματος. Παράλληλα, αναπτύχθηκε ένα πρόγραμμα προσομοίωσης για την μελέτη της απόδοσης ενός Κατανεμημένου συστήματος με χρονοδρομολόγηση παράλληλων εργασιών κάτω από διαδοχικές εκτελέσεις διαφορετικού φόρτου. Η εμπειρική μελέτη κατέδειξε βελτίωση της απόδοσης του κατανεμημένου συστήματος συγκριτικά με την αντίστοιχη εφαρμογή σε μοναδικό εξυπηρέτη σε συνθήκες υψηλού φόρτου, ενώ η μελέτη της προσομοίωσης πρόβαλλε σημαντικά αποτελέσματα για περαιτέρω έρευνα στην εξισορρόπηση του φόρτου.
description: The aim of this dissertation is to improve the performance of distributed server applications that face limitations of coordinating large computational resources. The current work is implemented under the prism of two different approaches: the first, is an empirical analysis based on Service Oriented Architecture technology, while the second approach is the implementation of a simulation program in distributed environments. The empirical study examines the integration of a Computational Fluid Dynamics application into a web application. The goal is to execute the application both in a single server and in a scalable distributed multi-server system, while exposing it to any network. The simulation study performs the evaluation of different scheduling algorithms and diversity of workload in a distributed system where the jobs are partitioned in parallel tasks. The empirical study showed execution time improvement under heavy workload, while the simulation results are promising for achieving fairness in resource allocation.
Measuring and characterizing the line profile of HARPS with a laser frequency comb
Creators: name: Zhao, Fei
name: Curto, G. Lo
name: Pasquini, L.
name: Hernández, J. I. González
name: De Medeiros, J. R.
name: Leão, I. C.
name: Martins, B. L. Canto
name: Rebolo, R.
name: Mascareño, A. Suárez
name: Esposito, M.
name: Manescau, A.
name: Steinmetz, T.
name: Udem, T.
name: Probst, R.
name: Holzwarth, R.
name: Zhao, G.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: Aims. We study the 2D spectral line profile of HARPS (High Accuracy Radial Velocity Planet Searcher), measuring its variation with position across the detector and with changing line intensity. The characterization of the line profile and its variations are important for achieving the precision of the wavelength scales of 10^{-10} or 3.0 cm/s necessary to detect Earth-twins in the habitable zone around solar-like stars. Methods. We used a laser frequency comb (LFC) with unresolved and unblended lines to probe the instrument line profile. We injected the LFC light (attenuated by various neutral density filters) into both the object and the reference fibres of HARPS, and we studied the variations of the line profiles with the line intensities. We applied moment analysis to measure the line positions, widths, and skewness as well as to characterize the line profile distortions induced by the spectrograph and detectors. Based on this, we established a model to correct for point spread function distortions by tracking the beam profiles in both fibres. Results. We demonstrate that the line profile varies with the position on the detector and as a function of line intensities. This is consistent with a charge transfer inefficiency (CTI) effect on the HARPS detector. The estimate of the line position depends critically on the line profile, and therefore a change in the line amplitude effectively changes the measured position of the lines, affecting the stability of the wavelength scale of the instrument. We deduce and apply the correcting functions to re-calibrate and mitigate this effect, reducing it to a level consistent with photon noise.
description: 9 pages, 6 figures, 3 tables, accepted
Η αντιμετώπιση του αρειανισμού από τον Μ. Αθανάσιο και τον Ιλάριο Πικταβίου:
Creators: name: Τριανταφύλλου, Βασιλική Θωμά
Publisher: name: Aristotle University of Thessaloniki
Year: 2011
Subjects: Αρειανισμός
M. Αθανάσιος
Ιλάριος
Arianism
St. Athanasius
St. Hilary

description: Ο αρειανισμός ήταν μια από τις πιο σημαντικές τριαδολογικές αιρέσεις που απασχόλησε τους κόλπους της εκκλησίας κατά τον τέταρτο αιώνα, τόσο στην ανατολή, όσο και στην δύση. Για την επίλυση της αρειανικής έριδας συγκλήθηκε η πρώτη οικουμενική σύνοδος στη Νίκαια της Βιθυνίας το 325. Επειδή και μετά τη σύνοδο της Νικαίας, η δράση των αρειανών συνεχίστηκε, γι’ αυτό και εμφανίστηκαν αξιόλογοι πατέρες, για την υπεράσπιση της ορθοδοξίας. Στην ανατολή σημαντικότερος πατέρας ήταν ο Μ. Αθανάσιος και στην δύση ο Ιλάριος, επίσκοπος Πικτάβων. Σκοπός της παρούσας εργασίας είναι να εξεταστεί ο τρόπος αντιμετώπισης του αρειανισμού τόσο από τον Μ. Αθανάσιο στην ανατολή, όσο και από τον Ιλάριο στην δύση και να βρεθούν τυχόν ομοιότητες και διαφορές των δυο πατέρων της εκκλησίας ως προς την αντιμετώπιση της αρειανικής αίρεσης.
description: Arianism was one of the most important heresies of triadology which employed the bays of church of the fourth century, not only in the east but also in the west. In order to solving this heresy the first ecumenical synod was hold in Nikaia of Bithinia on 325. Since and after the first ecumenical synod, the action of the arianism continued, so a lot of remarkable fathers appeared for the defence of orthodoxy. In the east the most important father of the church was saint Athanasius and in the west Hilary of Poitiers. The aim of this task is to examine the way of treatment of arianism not only by saint Athanasius in the east, but also by Hilary in the west and to find similarities and differences.
Κατασκευή εικονικού ανατομικού μοντέλου κεφαλής:
Creators: name: Σαγώνας, Χρήστος Δημητρίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2011
Subjects: Τριδιάστατη ανακατασκευή μοντέλου κεφαλής
Άτλας κεφαλής
Εικονικός ασθενής
3d head model reconstruction
Head atlas
Virtual patient

description: Στην παρούσα μεταπτυχιακή διατριβή, παρουσιάζεται ένα καινούργιο, υψηλής ανάλυσης μοντέλο ενός εικονικού ανθρώπινου κεφαλιού με στόχο να κατασκευαστεί ένα εκπαιδευτικό εργαλείο για μαθήματα ανατομίας του κεφαλιού, των στοματικών/ρηνικών κοιλοτήτων και των δοντιών. Το μοντέλου του ανθρώπινου κεφαλιού που δημιουργήθηκε, είναι βασισμένο στα ανατομικά δεδομένα που παρέχει το Visible Human Project. Αρχικά, με ημιαυτόματο τρόπο έγινε η εξαγωγή των περιγραμμάτων των ανατομικών δομών από τις ανατομικές φέτες του κεφαλιού. Δεύτερον, εφαρμόστηκαν μορφολογικές διαδικασίες στα περιγράμματα που εξήχθησαν, προκειμένου να εξομαλυνθεί ο όγκος της ανατομικής δομής. Για την εξαγωγή της επιφάνεια της ανατομικής δομής χρησιμοποιήθηκε ο αλγόριθμος Discretized Marching Cubes. Εκατόν δεκατρείς ανατομικές δομές του κεφαλιού κατατμήθηκαν και μοντελοποιήθηκαν. Ο βασικός στόχος του μοντέλου της κεφαλής που δημιουργήθηκε είναι να χρησιμοποιηθεί για την εκπαίδευση της ανατομίας της κεφαλής και για τη δημιουργία εικονικών ασθενών στην ιατρική/οδοντιατρική.
description: In this master thesis, a new high-resolution model of a virtual human head is introduced, aiming to build an educational tool for anatomy studies of the head, oral/nasal cavities and teeth. The human head model is based on anatomical data provided by Visible Human Project. Firstly, anatomical structures’ contours were extracted on head slices in a semi-automatic way. Secondly, morphological operations were applied in the extracted contours for smoothing the anatomical structure volume. For anatomical structure surface extraction, Discretized Marching Cubes were employed. One hundred thirteen head anatomical structures have been segmented and modeled. The basic aim of the created head model is to be used for head anatomy training and for creating virtual medical/dental patients.
The concept of local normal tissue damage in the evaluation of treatment planning parameter space
Creators: name: Chavez, Sofia Emilia
Publisher: name: University of British Columbia
Year: 2009

description: At present, there is still no systematic approach to the radiation treatment planning process which aims to provide maximum dose to all the tumour cells while the surrounding, normal but critical tissues are minimally irradiated. In fact, the process of treatment plan selection is usually simply based on experience from a large number of past trial-and-error cases in individual cancer centers. In this thesis, two new concepts are introduced, that are demonstrated to be useful tools to rationalize a systematic planning process. 1. The concept of local normal tissue damage (LNTD) : Using a similar concept to that of "cellular damage" in radiobiological models, a concept of a localized "normal tissue damage" is introduced. This simple model is designed to make the best use of current limited clinical estimates of whole organ complication probabilities while providing a coherent framework that will preserve spatial information as well as condense the information into a numerical score for the plan. 2. The concept of parameter space mapping : Treatment parameter mappings will indicate the tissue-specific effect of the dose distribution resulting for the given parameter values. Such mappings can provide very useful insights for treatment plan selection. The use of this new tool is demonstrated in studying the values of the fixation point coordinates for the treatment of uveal melanoma at TRIUMF . Important insight is gained about the effects of the values of the fixation point coordinates on the probable success of the treatment. Such mappings help make treatment planning more efficient, objective and systematic which allows for a better exploitation of the full potential of the proton beam. The above concepts are combined to provide a systematic strategy for treatment planning that will rely on the tissue-specific response to inhomogeneous dose distributions. The LNTD model is used to transform dose distributions into damage maps and then an overall score for that plan can be determined. This score is then used as the information mapped on a fixation point space mapping in order to facilitate selection of a plan. Also, the rationale for the development of multiple-fields is based on the resulting non-linearity of the LNTD(d) curves and hence it is demonstrated that it can be used along with the parameter space mappings in order to successfully plan such a treatment.
Ultrasonic Oscillatory Two-phase Flow in Microchannels
Creators: name: Lu, Zhaokuan
name: Dupuis, Eric D.
name: Patel, Viral K.
name: Momen, Ayyoub M.
name: Shahab, Shima
Publisher: name: arXiv
Year: 2020
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Experimental and numerical investigations are performed to provide an assessment of the transport behavior of an ultrasonic oscillatory two-phase flow in a microchannel. The work is inspired by the flow observed in an innovative ultrasonic fabric drying device using a piezoelectric bimorph transducer with microchannels, where a water-air two-phase flow is transported by harmonically oscillating microchannels. The flow exhibits highly unsteady behavior as the water and air interact with each other during the vibration cycles, making it significantly different from the well-studied steady flow in microchannels. The computational fluid dynamics (CFD) modeling is realized by combing the turbulence Reynolds-averaged Navier-Stokes (RANS) k-$ω$ model with the phase-field method to resolve the dynamics of the two-phase flow. The numerical results are qualitatively validated by the experiment. Through parametric studies, we specifically examined the effects of vibration conditions (i.e., frequency and amplitude), microchannel taper angle, and wall surface contact angle (i.e., wettability) on the flow rate through the microchannel. The results will advance the potential applications where oscillatory or general unsteady microchannel two-phase flows may be present.
description: 28 pages, 24 figures
Συνδέσεις σε MapReduce:
Creators: name: Χαλκίδης, Κωνσταντίνος Ιωάννη
Publisher: name: Aristotle University of Thessaloniki
Year: 2011
Subjects: Συνδέσεις
Κατανεμημένη Διαχείριση δεδομένων
Ομοχειρία
Joins
MapReduce
Pipeline

description: Στην εποχή μας η ανάγκη επεξεργασίας δεδομένων είναι πιο έντονη από ποτέ. Λύσεις όπως το Map/Reduce παρουσιάστηκαν για την επεξεργασία μεγάλων σετ δεδομένων σε συστοιχίες υπολογιστών και υπολογιστές πλέγματος. Το Hadoop αποτελεί μια υλοποίηση του Map/Reduce. Η παρούσα εργασία μελετάει το Hadoop και τις εργασίες τις οποίες μπορεί να εκτελέσει. Μία από αυτές είναι η εκτέλεση συνδέσεων. Περιγράφει τους τρόπους με τους οποίους πραγματοποιούμε τις συνδέσεις . Στη συνέχεια μελετάει την δυνατότητα pipeline κατά την εκτέλεση των συνδέσεων και πως μπορούμε να την επιτύχουμε σε συχνά εμφανιζόμενες συνδέσεις όπως της αλυσίδας και του αστεριού. Για να αξιολογήσουμε το μοντέλο εκτέλεσης με pipeline προχωράμε στην εκτέλεση πειραμάτων και μελετάμε το χρόνο απόκρισης των ερωτημάτων(σύνδεση) καθώς το συνολικό Ι/Ο που εκτελείται από τα μηχανήματα. Τέλος παρουσιάζουμε τα συμπεράσματά από την μελέτη και προτείνουμε κατευθύνσεις για περαιτέρω έρευνα
description: In our time more and more we deal with the problem of managing large datasets. Solutions such as MapReduce have emerged to answer that need by giving us an easy way to process large datasets in computer cluster. Hadoop is a free implementation of MapReduce. This thesis studies Hadoop-MapReduce and the problems it can answer. One of these problems is executing joins in a distributed environment. In this thesis we describe the way joins can me computed in a MapReduce platform. Furthermore we study the possibility of applying pipeline to a MapReduce execution and we apply in join execution. We proceed in experimental evaluation of our pipeline model by monitoring its performance in time and I/O fields. Finally we present our findings and give directions for future research
title: Marine litter in the Basque Continental Shelf (Bay of Biscay-NE Atlantic)
Creators: name: Garmendia, Joxe Mikel
name: Uriarte, Ainhize
name: Quincoces, Iñaki
name: Santurtún, Marina
Publisher: name: ASC 2013 - Theme session A
Year: 2024
Subjects: The sea and human culture and societies
Pressures, impacts, conservation, and management

description: No abstracts are to be cited without prior reference to the author. The European Marine Strategy Directive (Directive 2008/56/EC) establishes a framework and common targets for the protection and conservation of the marine environment. This Directive requires the implementation of all necessary measures to achieve the good environmental status by 2020, according to 11 qualitative descriptors: one of them corresponds to marine litter
Έλεγχος της λειτουργίας και των οπτικών χαρακτηριστικών του φασματοφωτομέτρου Brewer #086:
Creators: name: Φουντουλάκης, Ηλίας Νικολάου
Publisher: name: Aristotle University of Thessaloniki
Year: 2011
Subjects: Φασματοφωτόμετρο
Λειτουργία
Οπτικά
Spectrometer
Operation
Visual

description: Η παρούσα διπλωματική εργασία αφορά τον έλεγχο της λειτουργίας και των οπτικών χαρακτηριστικών του φασματοφωτομέτρου τύπου ΜΚΙΙΙ με σειριακό αριθμό #086 που είναι εγκατεστημένο στο τμήμα φυσικής του Α.Π.Θ.. Αρχικά γίνεται αναφορά στην αρχή λειτουργίας και την απόλυτη βαθμονόμηση του οργάνου. Ακολουθεί ο έλεγχος της λειτουργίας του συστήματος μέτρησης των λυχνιών ισχύος 50 Watt που χρησιμοποιούνται για τον συμπληρωματικό έλεγχο της λειτουργίας του οργάνου. Στη συνέχεια παρατίθενται τα αποτελέσματα που προέκυψαν από τον έλεγχο της συμπεριφοράς των φίλτρων εξασθένισης της ακτινοβολίας που χρησιμοποιούνται στο όργανο καθώς και τον έλεγχο της φασματικής συμπεριφοράς του οργάνου κατά την αλλαγή σχισμής. Στα δύο τελευταία κεφάλαια παρατίθενται τα αποτελέσματα που προέκυψαν από τον έλεγχο των ενδείξεων της θερμοκρασίας του οργάνου και τον έλεγχο της επίδρασης της θερμοκρασίας στη συμπεριφορά των εσωτερικών λυχνιών αλογόνου.
description: The objectives of present work are the operational check and the visual components check of type MKIII spectrometer with serial number #086, which is placed at A.U.TH. physics department. First and second chapter are about operation and absolute calibration of the instrument. In second chapter, there is also a part about checking the system used for 50 Watt external lamps radiation measuring. In third chapter there are results showed by attenuation filters check while in fourth chapter there are results showed by checking the spectral performance of instrument, while radiation is measured using different slits. In the last two chapters there are results showed by checking the values of temperature, recorded by instrument sensors and results showed by checking the effect of temperature on internal halogen lamps operation respectively.
title: Litter composition on the shelf and upper slope of the Argosaronikos region and the eastern Ionian Sea, as evidenced by MEDITS surveys 1995‐2008.
Creators: name: Lefkaditou, Evgenia
name: Karkani, Maria
name: Aikaterini Anastasopoulou, Stefanos Kavadas
name: Christidis, George
name: Mytilineou, Chryssi.
Publisher: name: ASC 2013 - Theme session A
Year: 2024
Subjects: The sea and human culture and societies
Pressures, impacts, conservation, and management

description: No abstracts are to be cited without prior reference to the author. Photographs of the total catch, taken by haul during Greek MEDITS surveys (1995‐2008), have been used for a preliminary investigation on composition and spatio‐temporal distribution of macro‐litter in the eastern Ionian Sea and the region of Argosaronikos (middle west Aegean Sea). Litter items were categorized, counted and reported following the recently established MEDITS protocol for litter. Litter was recorded in more than 85% of examined hauls on shelf and slope of both studied areas, with plastic items most frequently collected (shelf: > 66%, slope: ~80%), followed by    metallic (>45%) and   glass/ceramic objects (> 23%). Litter annual density estimates were generally higher in the region of Argosaronikos but a significant increasing trend of annual density was shown only for metallic and glass/ceramic items on the slope of the eastern Ionian Sea. Items of the 3 main litter categories, generally accumulated along navigation routes, apart from a high density of plastic items, observed on the southern Argosaronikos slope that might be rather associated to the water‐masses circulation along the western Aegean Sea and needs further investigation.
MUSE view of Arp220: Kpc-scale multi-phase outflow and evidence for positive feedback
Creators: name: Perna, M.
name: Arribas, S.
name: Catalan-Torrecilla, C.
name: Colina, L.
name: Bellocchi, E.
name: Fluetsch, A.
name: Maiolino, R.
name: Cazzoli, S.
name: Caballero, A. Hernan
name: Santaella, M. Pereira
name: Lopez, J. Piqueras
name: del Pino, B. Rodriguez
Publisher: name: arXiv
Year: 2020
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Arp220 is the nearest and prototypical ULIRG, and shows evidence of pc-scale molecular outflows in its nuclear regions and strongly perturbed ionised gas kinematics on kpc scales. It is therefore the ideal system for investigating outflows and feedback phenomena in details. We investigate the feedback effects on the Arp220 ISM, deriving a detailed picture of the atomic gas in terms of physical and kinematic properties, with a spatial resolution never obtained before (0.56", i.e. ~ 210 pc). We use optical IFS observations from VLT/MUSE-AO to obtain spatially resolved stellar and gas kinematics, for both ionised ([N II]6583) and neutral (Na ID5891,96) components; we also derive dust attenuation, electron density, ionisation conditions and hydrogen column density maps to characterise the ISM properties. Arp220 kinematics reveal the presence of a disturbed, kpc-scale disk in the innermost nuclear regions, and highly perturbed, multi-phase (neutral and ionised) gas along the minor-axis of the disk, which we interpret as a galactic-scale outflow emerging from the Arp220 eastern nucleus. This outflow involves velocities up to ~ 1000 km/s at galactocentric distances of ~ 5 kpc, and has a mass rate of ~ 50 Msun/yr, and kinetic and momentum power of ~ 1e43 erg/s and ~ 1e35 dyne, respectively. The inferred energetics do not allow us to distinguish the origin of the outflows, i.e. whether they are AGN-driven or starburst-driven. We also present evidence for enhanced star formation at the edges of - and within - the outflow, with a star formation rate SFR ~ 5 Msun/yr (i.e. ~ 2% of the total SFR). Our findings suggest the presence of powerful winds in Arp220: they might be capable of removing or heating large amounts of gas from the host ("negative feedback"), but could be also responsible for triggering star formation ("positive feedback").
description: Accepted for publication in Astronomy & Astrophysics
Inflaton Fragmentation After lambda phi^4 Inflation
Creators: name: Felder, Gary N
name: Navros, Olga
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We use lattice simulations to examine the detailed dynamics of inflaton fragmentation during and after preheating in $λϕ^4$ chaotic inflation. The dynamics are qualitatively similar to preheating after $m^2 ϕ^2$ inflation, involving the exponential growth and subsequent expansion and collision of bubble-like inhomogeneities of the inflaton and other scalar fields. During this stage fluctuations of the fields become strongly non-Gaussian. In the quartic theory, the conformal nature of the theory allows us to extend our simulations to much greater times than is possible for the quadratic model. With these longer simulations we have been able to determine the time scale on which Gaussianity is restored, which occurs after a time on the order of a thousand inflaton oscillations.
description: 5 pages, 5 figures
A Symplectic Isotopy of a Dehn Twist on CP^n x CP^{n+1}
Creators: name: Dupont, Emiko
Publisher: name: arXiv
Year: 2008
Subjects: subject: Symplectic Geometry (math.SG)
subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics

description: The complex manifold CP^n x CP^{n+1} with symplectic form σ_μ=σ_{CP^n}+μσ_{CP^{n+1}}, where σ_{CP^n} and σ_{CP^{n+1}} are normalized Fubini-Study forms, n a natural number and μ>1 a real number, contains a natural Lagrangian sphere L^μ. We prove that the Dehn twist along L^μ is symplectically isotopic to the identity for all μ>1. This isotopy can be chosen so that it pointwise fixes a complex hypersurface in CP^n x CP^{n+1} and lifts to the blow-up of CP^n x CP^{n+1} along a complex n-dimensional submanifold.
description: 20 pages, 6 figures
On the Fulde-Ferrell State in Spatially Isotropic Superconductors
Creators: name: Ohashi, Yoji
Publisher: name: arXiv
Year: 2006
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Effects of superconducting fluctuations on the Fulde-Ferrell (FF) state are discussed in a spatially isotropic three-dimensional superconductor under a magnetic field. For this system, Shimahara recently showed that within the phenomenological Ginzburg-Landau theory, the long-range order of the FF state is suppressed by the phase fluctuation of the superconducting order parameter. [H. Shimahara: J. Phys. Soc. Jpn. {\bf 67} (1998) 1872, Physica B {\bf 259-261} (1999) 492] In this letter, we investigate this instability of the FF state against superconducting fluctuations from the microscopic viewpoint, employing the theory developed by Noziéres and Schmitt-Rink in the BCS-BEC crossover field. Besides the absence of the second-order phase transition associated with the FF state, we show that even if the pairing interaction is weak, the shift of the chemical potential from the Fermi energy due to the fluctuations is crucial near the critical magnetic field of the FF state obtained within the mean-field theory.
description: 11 pages, 1 figure
EDGELESS D3.1: Building block abstraction, initial definition
Creators: name: Ott, Jörg
name: Hetzel, Raphael
Publisher: name: Zenodo
Year: 2024

description: This deliverable describes work done in WP3 (Edge enabling technologies) between the start of WP3 in M5 and the date of this deliverable, M12. In this eight-month period, EDGELESS has produced an outline implementation of the EDGELESS platform using existing state-of-the-art tooling, initial implementations of the key platform components, an early integration of those components into a functioning prototype of the platform, and defined abstractions and tools to the extent necessary for other WPs to make progress.This deliverable provides a summary of the work undertaken by EDGELESS in each task to date and work undertaken by various partners relevant to the delivery of the future requirements. The current status of WP3 is that we have a working prototype on which other WPs can build and that we will continue developing iteratively based on input and feedback from those WPs, particularly WP5 Use Cases. Key next steps (work on some of which is already underway) include adding support for driving analytics into WP4 (T3.1), developing the novel toolchain approach to lightweight virtualisation in support of the wide range of targeted hardware (T3.2), integrating specialized hardware into the prototype (T3.3), and integrating trusted execution environments (TEEs) into the prototype (T3.4).
Selection of Optimal Parameters in the Fast K-Word Proximity Search Based on Multi-component Key Indexes
Creators: name: Veretennikov, Alexander B.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Information Retrieval (cs.IR)
subject: FOS: Computer and information sciences

description: Proximity full-text search is commonly implemented in contemporary full-text search systems. Let us assume that the search query is a list of words. It is natural to consider a document as relevant if the queried words are near each other in the document. The proximity factor is even more significant for the case where the query consists of frequently occurring words. Proximity full-text search requires the storage of information for every occurrence in documents of every word that the user can search. For every occurrence of every word in a document, we employ additional indexes to store information about nearby words, that is, the words that occur in the document at distances from the given word of less than or equal to the MaxDistance parameter. We showed in previous works that these indexes can be used to improve the average query execution time by up to 130 times for queries that consist of words occurring with high-frequency. In this paper, we consider how both the search performance and the search quality depend on the value of MaxDistance and other parameters. Well-known GOV2 text collection is used in the experiments for reproducibility of the results. We propose a new index schema after the analysis of the results of the experiments. This is a pre-print of a contribution published in Supplementary Proceedings of the XXII International Conference on Data Analytics and Management in Data Intensive Domains (DAMDID/RCDL 2020), Voronezh, Russia, October 13-16, 2020, P. 336-350, published by CEUR Workshop Proceedings. The final authenticated version is available online at: http://ceur-ws.org/Vol-2790/
description: Indexing: Scopus
Τρεις προσεγγίσεις για το σχεδιασμό της παραγωγής σε επίπεδο περιοχής με την εφαρμογή προγραμματισμού:
Creators: name: Δημητριάδου, Ελένη Μιχαήλ
Publisher: name: Aristotle University of Thessaloniki
Year: 2011
Subjects: Γραμματικος Προγραμματισμός
Σχεδιασμός Παραγωγής Περιοχής
Linear Programming
Regional Planning

description: Ο σχεδιασμός και η οργάνωση της γεωργικής παραγωγής αποτελεί μέλημα των σύγχρονων οικονομιών προκειμένου να επιβιώσουν στο πλαίσιο του ευρωπαϊκού και παγκόσμιου ανταγωνισμού. Για την επίτευξη του σωστού σχεδιασμού απαιτείται προγραμματισμός τόσο σε επίπεδο εκμετάλλευσης κυρίως όμως σε επίπεδο περιοχής προκειμένου να εντοπισθούν οι δυνατότητες ανάπτυξής της. Ο τρόπος προσέγγισης της περιοχής για το σχεδιασμό της παραγωγής περιοχής με την εφαρμογή γραμμικού προγραμματισμού οδηγεί σε διαφοροποίηση της σύνθεσης των καλλιεργειών, της αξιοποίησης των συντελεστών παραγωγής και του οικονομικού αποτελέσματος. Για τον εντοπισμό των διαφορών αυτών και των δυνατοτήτων ανάπτυξης μιας περιοχής χρησιμοποιήθηκαν τρεις προσεγγίσεις εφαρμογής γραμμικού προγραμματισμού σε επίπεδο περιοχής. Η πρώτη αφορούσε εφαρμογή γραμμικού προγραμματισμού στις μεμονωμένες εκμεταλλεύσεις της περιοχής ενώ οι άλλες δύο, εφαρμογή γραμμικού προγραμματισμού στο σύνολο της έκτασης της περιοχής. Τα αποτελέσματα έδειξαν ότι όσο πιο γενική η προσέγγιση, δηλαδή προσέγγιση της περιοχής λαμβάνοντας περιορισμούς στο σύνολο της έκτασης της περιοχής, τόσο μεγαλύτερος ο αριθμός των ανταγωνιζόμενων κλάδων παραγωγής, μεγαλύτερη αξιοποίηση των συντελεστών παραγωγής και υψηλότερο οικονομικό αποτέλεσμα, μέσα από τα οποία διαφαίνονται και οι δυνατότητες ανάπτυξης της περιοχής.
description: The planning and organization of agricultural production is a concern of modern economies in order to survive in the European and global competition. To achieve good planning requires planning at farm level but especially at regional level to identify potential development. The approach to the region for the production planning area to the application of linear programming leads to modulation of the composition of crops, the use of inputs and financial results. To identify these differences and potential development of the region were used three approaches implementing linear programming to the area of the region. The first was implementing linear programming on individual farms in the area while the other two, implementing linear programming on the total area of the region. The results showed that the more general approach, ie approach the region under restrictions on the total area of the region, the greater the number of competing crops, greater use of inputs and higher economic performance, through which we can see the development possibilities of the region.
Free Volume Power Law for Transport Properties of Hard Sphere Fluid
Creators: name: Liu, Hongqin
Publisher: name: arXiv
Year: 2020
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: This paper presents a study on the relationship between transport properties and geometric free volume for hard sphere (HS) system in dense fluid region. Firstly, a generic free volume distribution function is proposed based on recent simulation results for the HS geometric free volume by Maiti et al. [1,2] Combining the new distribution function with a local particle transportation model, we obtain a power law for the HS transport properties. Then a relation between the geometric free volume and thermodynamic free volume is established, which makes it possible to use well-developed equations of state (EoS) for the expressions of the geometric free volume. The new power law models are tested with molecular dynamic (MD) simulation results for HS viscosity, diffusivity and thermal conductivity, respectively and the results are very satisfactory. Using the power law we are able to reproduce several equations obtained from different approaches, such as the entropy scaling laws [3], mode coupling theory [4] or empirical correlations [5]. In particular, A long-standing controversy regarding the well known Cohen-Turnbull-Doolittle free volume model [6,7] is resolved by using the power law combined with an EoS.
description: 12 Pages, 10 Figures
title: Plastic pellets and early stage biofilm development
Creators: name: Thompson, Haydn F.
name: Cowie, Phillip
name: Hannah, Fiona
Publisher: name: ASC 2013 - Theme session A
Year: 2024
Subjects: The sea and human culture and societies
Pressures, impacts, conservation, and management

description: No abstracts are to be cited without prior reference to the author. AIM: To determine whether biofilm formation happens more readily on polystyrene or so-called biodegradable plastic (Bioplast)
On area-stationary surfaces in certain neutral Kaehler 4-manifolds
Creators: name: Guilfoyle, Brendan
name: Klingenberg, Wilhelm
Publisher: name: arXiv
Year: 2006
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: Primary: 53B30; Secondary: 53A25

description: We study surfaces in TN that are area-stationary with respect to a neutral Kaehler metric constructed on TN from a riemannian metric g on N. We show that holomorphic curves in TN are area-stationary, while lagrangian surfaces that are area-stationary are also holomorphic and hence totally null. However, in general, area stationary surfaces are not holomorphic. We prove this by constructing counter-examples. In the case where g is rotationally symmetric, we find all area stationary surfaces that arise as graphs of sections of the bundle TN$\to$N and that are rotationally symmetric. When (N,g) is the round 2-sphere, TN can be identified with the space of oriented affine lines in ${\Bbb{R}}^3$, and we exhibit a two parameter family of area-stationary tori that are neither holomorphic nor lagrangian.
description: 8 pages, AMS-LATEX, no figures
Quantum Keyless Privacy vs. Quantum Key Distribution for Space Links
Creators: name: Vazquez-Castro, A.
name: Rusca, D.
name: Zbinden, H.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: Cryptography and Security (cs.CR)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: We study information theoretical security for space links between a satellite and a ground-station. Quantum key distribution (QKD) is a well established method for information theoretical secure communication, giving the eavesdropper unlimited access to the channel and technological resources only limited by the laws of quantum physics. But QKD for space links is extremely challenging, the achieved key rates are extremely low, and day-time operating impossible. However, eavesdropping on a channel in free-space without being noticed seems complicated, given the constraints imposed by orbital mechanics. If we also exclude eavesdropper's presence in a given area around the emitter and receiver, we can guarantee that he has only access to a fraction of the optical signal. In this setting, quantum keyless private (direct) communication based on the wiretap channel model is a valid alternative to provide information theoretical security. Like for QKD, we assume the legitimate users to be limited by state-of-the-art technology, while the potential eavesdropper is only limited by physical laws: physical measurement (Helstrom detector) and quantum electrodynamics (Holevo bound). Nevertheless, we demonstrate information theoretical secure communication rates (positive keyless private capacity) over a classical-quantum wiretap channel using on-off-keying of coherent states. We present numerical results for a setting equivalent to the recent experiments with the Micius satellite and compare them to the fundamental limit for the secret key rate of QKD. We obtain much higher rates compared with QKD with exclusion area of less than 13 meters for Low Earth Orbit (LEO) satellites. Moreover, we show that the wiretap channel quantum keyless privacy is much less sensitive to noise and signal dynamics and daytime operation is possible.
Zeeman tomography of magnetic white dwarfs III. The 70-80 Megagauss magnetic field of PG 1015+014
Creators: name: Euchner, F.
name: Jordan, S.
name: Beuermann, K.
name: Reinsch, K.
name: Gaensicke, B. T.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Aims: We analyse the magnetic field geometry of the magnetic DA white dwarf PG 1015+014 with our Zeeman tomography method.
 Methods: This study is based on rotation-phase resolved optical flux and circular polarization spectra of PG 1015+014 obtained with FORS1 at the ESO VLT. Our tomographic code makes use of an extensive database of pre-computed Zeeman spectra. The general approach has been described in Papers I and II of this series.
 Results: The surface field strength distributions for all rotational phases of PG 1015+014 are characterised by a strong peak at 70 MG. A separate peak at 80 MG is seen for about one third of the rotation cycle. Significant contributions to the Zeeman features arise from regions with field strengths between 50 and 90 MG. We obtain equally good simultaneous fits to the observations, collected in five phase bins, for two different field parametrizations: (i) a superposition of individually tilted and off-centred zonal multipole components; and (ii) a truncated multipole expansion up to degree l = 4 including all zonal and tesseral components. The magnetic fields generated by both parametrizations exhibit a similar global structure of the absolute surface field values, but differ considerably in the topology of the field lines. An effective photospheric temperature of Teff = 10000 ± 1000 K was found.
 Conclusions: Remaining discrepancies between the observations and our best-fit models suggest that additional small-scale structure of the magnetic field exists which our field models are unable to cover due to the restricted number of free parameters.

description: 12 LaTeX pages, 9 EPS figures, accepted for publication in Astronomy & Astrophysics. Full-resolution colour figues can be found at http://www.astro.physik.uni-goettingen.de/~feuchner/publications/aa/4840
Ο ρόλος της μηχανικής μάθησης στην κλινική Ψυχιατρική: εφαρμογή σε δεδομένα καταθληπτικών ασθενών
Creators: name: Τσιρώνης, Θεοχάρης Γεωργίου
name: Καμπάκης, Στυλιανός Μιχαήλ
Publisher: name: Aristotle University of Thessaloniki
Year: 2011
Subjects: Μηχανική μάθηση
Ψυχιατρική
Κατάθλιψη
Machine learning
Psychiatry
Depression

description: Σκοπός της διατριβής ήταν η μελέτη της εφαρμογής αλγορίθμων μηχανικής μάθησης σε δεδομένα καταθλιπτικών ασθενών. Οι αλγόριθμοι μηχανικής μάθησης παρέχουν κάποια πλεονεκτήματα σε σχέση με τις κλασσικές στατιστικές μεθόδους που χρησιμοποιούνται στην ψυχιατρική, όπως για παράδειγμα, το γεγονός ότι χειρίζονται πολύ καλά την μη-γραμμικότητα. Μέσα από την έρευνά μας καταλήξαμε σε εκτεταμένη χρήση δέντρων απόφασης χάρη στα οποία καταφέραμε να δημιουργήσουμε ένα νέο ερωτηματολόγιο για την κατάθλιψη, καθώς και να βρούμε σημαντικά ευρήματα σε σχέση με τους κεντρικούς άξονες της κατάθλιψης.
description: The aim of the present thesis was the study of the applications of machine learning algorithms in data of depressed patients. Machine learning algorithms offer some advantages compared to common statistical procedures used in psychiatry, such as the fact that they can handle non-linearity very well. Through our research we ended up using decision trees in order to create a new questionnaire for depression, as well as, making some important findings concerning the basic axons of depressions.
description: Σε συνεργασία με το τμήμα Λογιστικής και Χρηματοοικονομικής (Πανεπιστήμιο Μακεδονίας)
title: CleanSea Poster
Creators: name: Fernández, Pedro
name: Arán, Elena
name: Pérez, Carolina
name: Ferreira, Maria
Publisher: name: ASC 2013 - Theme session A
Year: 2024
Subjects: The sea and human culture and societies
Pressures, impacts, conservation, and management

description: No abstracts are to be cited without prior reference to the author. CleanSea poster from 2013
Mining information from binary black hole mergers: a comparison of estimation methods for complex exponentials in noise
Creators: name: Berti, Emanuele
name: Cardoso, Vitor
name: Gonzalez, Jose A.
name: Sperhake, Ulrich
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The ringdown phase following a binary black hole merger is usually assumed to be well described by a linear superposition of complex exponentials (quasinormal modes). In the strong-field conditions typical of a binary black hole merger, non-linear effects may produce mode coupling. Artificial mode coupling can also be induced by the black hole's rotation, if the radiation field is expanded in terms of spin-weighted spherical (rather than spheroidal) harmonics. Observing deviations from linear black hole perturbation theory requires optimal fitting techniques to extract ringdown parameters from numerical waveforms, which are inevitably affected by errors. So far, non-linear least-squares fitting methods have been used as the standard workhorse to extract frequencies from ringdown waveforms. These methods are known not to be optimal for estimating parameters of complex exponentials. Furthermore, different fitting methods have different performance in the presence of noise. The main purpose of this paper is to introduce the gravitational wave community to modern variations of a linear parameter estimation technique first devised in 1795 by Prony: the Kumaresan-Tufts and matrix pencil methods. Using "test" damped sinusoidal signals in Gaussian white noise we illustrate the advantages of these methods, showing that they have variance and bias at least comparable to standard non-linear least-squares techniques. Then we compare the performance of different methods on unequal-mass binary black hole merger waveforms. The methods we discuss should be useful both theoretically (to monitor errors and search for non-linearities in numerical relativity simulations) and experimentally (for parameter estimation from ringdown signals after a gravitational wave detection).
description: 20 pages, 7 figures, minor changes to match version in press in PRD