cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Geospatial repository
Creators: name: Sanchez-Ospina, Cristhian Mateo
name: Salazar-Jaramillo, Susana
Publisher: name: figshare
Year: 2024
Subjects: classificationCode: 410605
subject: Soil physics
classificationCode: 370403
subject: Geoscience data visualisation
classificationCode: 370901
subject: Geomorphology and earth surface processes
classificationCode: 370906
subject: Regolith and landscape evolution

description: The article focuses on evaluating soil erosion in the tropical dry forest of La Tatacoa using advanced remote sensing techniques. the research employs the SBAS InSAR technique to measure vertical displacement rates and assess soil degradation. Sentinel-1 radar data and Sentinel-2 multispectral images are processed to determine displacement velocity (in mm/year) and vegetation indices like the NDVI. Morphometric analysis derived from the ALOS PALSAR digital elevation model provides additional context on geomorphological attributes such as slope angle and relative height. The study reveals that between 2018 and 2023, the erosion rate reached 30 mm/year, intensifying in dissected terrain with slopes of 9 to 20 degrees. An accelerated displacement trend was observed between 2021 and 2022, suggesting an increase in degradation processes.
Επίδραση εναλλακτικών του βρωμιούχου μεθυλίου μεθόδων στη μείωση του μολύσματος των εδαφογενών ασθενειών
Creators: name: Moustafa Ismail, Asraf Mounir
Publisher: name: Aristotle University of Thessaloniki
Year: 2002
Subjects: Οικονομική αξιολόγηση
Εμπειρικό υπόδειγμα πρόγνωσης
Υπολείμματα βρωμιούχου μεθυλίου
Economical assessment
Empirical prognosis model
Methyl bromide residue

description: Η παρούσα έρευνα σχεδιάστηκε με σκοπό τη μελέτη των εναλλακτικών μεθόδων για την αντικατάσταση του βρωμιούχου μεθυλίου στην αντιμετώπιση εδαφογενών ασθενειών. Οι μελιτζάνες που εμβολιάστηκαν στο υποκέιμενο Solanumtorrum ήταν σχεδόν άνοσες και σπάνια εμφάνιζαν συμπτώματα βερτισιλλίωσης και είχαν καλύτερη παραγωγή από το χειρισμό με Β.Μ. Οι μέθοδοι Perlka και ηλιοαπολύμανση εμφάνισαν σχεδόν όμοια αποτελεσματικότητα μ'αυτή του Β.Μ. Για την αντιμετώπιση της φουζαρίωσης του πεπονιού στο θερμοκήπιο, οι μέθοδοι εμβολιασμός, ηλιοαπολύμανση και perlka ήταν πολύ αποτελεσματικές. Για την αντιμετώπιση της φουζαρίωσης του αγγουριού οι μέθοδοι ηλιοαπολύμανση και perlka ήταν αποτελεσματικές. Οι ίδιες μέθοδοι ήταν επίσης αποτελεσματικές και όσο αφορά στην αντιμετώπιση ορισμένων ζιζανίων. Το συνολικό ποσό ανόργανου βρωμίου ήταν αυξημένο στις μελιτζάνες, στα πεπόνια και στα αγγουράκια που προήλθαν από φυτά τα οποία είχαν καλλιεργηθεί σε εδάφη υποκαπνισμένα με Β.Μ. Στις καλλιέργειες μελιτζάνας και πεπονιού υψηλότερη πρόσοδος επιτεύχθηκε με τη μέθοδο του εμβολιασμού ακολουθούμενη απ'αυτή της perlka και της ηλιοαπολύμανσης, ενώ στην καλλιέργεια αγγουριού η υψηλότερη πρόσοδος επιτεύχθηκε με τη μέθοδο perlka ακολουθούμενη από την ηλιοαπολύμανση. Επίσης αναπτύχθηκε ένα εμπειρικό μοντέλο πρόγνωσης απωλειών στην καλλιέργεια μελιτζάνας.0S(100)(fy)dy=E=(0,5/v)(0*v0+2*v1+4*v2+6*v3+8*v4+5*v5).Το αποτέλεσμα αυτής της εξίσωσης είναι η τελική πρόγνωση των μελλοντικών απωλειών από τη βερτισιλλίωση στην καλλιέργεια μελιτζάνας
description: The present investigation was planned to study the alternative proposals for the replacement of methyl bromide(MB) in the control of soil-borne disease. The eggplant grafted on the rootstock Solanum torrum were almost immune with rare verticillium with symptoms with better yield than MB perlka and solarization showed almost the same efficacy as BM. For the control of fusarium with of melon in greenhouse grafting, solarization and perlka were very effective. For control fusarium wilt of cucumber solarization and perlka were very effective. Solarization and perlka were also effective in controlling some weeds. The total inorganic bromide was highly increased in eggpland, melon and cucumber fruits from plants cultivated in previously fumigated soil with MB. In eggplant and melon the highest profit income was by grafting followed by perlka and then solarization but in cucumber was perlka followed by solarization. An empirical model for prognosis of loss assessment in eggplant was also development.0S(100)f(y)dy=E=(o.5/n)(0*n0+2*n1+4*n2+6*n3+8*n4+5*n5). The result from this equation is the final prognosis for the future losses by verticillium wilt in eggplant
Estimation of the number of muons with muon counters
Creators: name: Supanitsky, A. D.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The origin and nature of the cosmic rays is still uncertain. However, a big progress has been achieved in recent years due to the good quality data provided by current and recent cosmic-rays observatories. The cosmic ray flux decreases very fast with energy in such a way that for energies $\gtrsim 10^{15}$ eV, the study of these very energetic particles is performed by using ground based detectors. These detectors are able to detect the atmospheric air showers generated by the cosmic rays as a consequence of their interactions with the molecules of the Earth's atmosphere. One of the most important observables that can help to understand the origin of the cosmic rays is the composition profile as a function of primary energy. Since the primary particle cannot be observed directly, its chemical composition has to be inferred from parameters of the showers that are very sensitive to the primary mass. The two parameters more sensitive to the composition of the primary are the atmospheric depth of the shower maximum and the muon content of the showers. Past and current cosmic-rays observatories have been using muon counters with the main purpose of measuring the muon content of the showers. Motivated by this fact, in this work we study in detail the estimation of the number of muons that hit a muon counter, which is limited by the number of segments of the counters and by the pile-up effect. We consider as study cases muon counters with segmentation corresponding to the underground muon detectors of the Pierre Auger Observatory that are currently taking data, and the one corresponding to the muon counters of the AGASA Observatory, which stopped taking data in 2004.
description: Astroparticle Physics 127 (2021) 102535
Electrodynamics for Nuclear Matter in Bulk
Creators: name: Ruffini, Remo
name: Rotondo, Michael
name: Xue, She-Sheng
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: A general approach to analyze the electrodynamics of nuclear matter in bulk is presented using the relativistic Thomas-Fermi equation generalizing to the case of $N \simeq (m_{\rm Planck}/m_n)^3$ nucleons of mass $m_n$ the approach well tested in very heavy nuclei ($Z \simeq 10^6$). Particular attention is given to implement the condition of charge neutrality globally on the entire configuration, versus the one usually adopted on a microscopic scale. As the limit $N \simeq (m_{\rm Planck}/m_n)^3$ is approached the penetration of electrons inside the core increases and a relatively small tail of electrons persists leading to a significant electron density outside the core. Within a region of $10^2$ electron Compton wavelength near the core surface electric fields close to the critical value for pair creation by vacuum polarization effect develop. These results can have important consequences on the understanding of physical process in neutron stars structures as well as on the initial conditions leading to the process of gravitational collapse to a black hole.
description: 10 pages, 5 figures
Bononia, the Roman Bologna: Archaeoastronomy and Chronology
Creators: name: Sparavigna, Amelia Carolina
Publisher: name: Zenodo
Year: 2019
Subjects: Archaeoastronomy
Roman chronology
Roman towns
Bononia
Bologna
Centuriation

description: In an article written by Giulio Magli on the orientation of the Roman towns, Bononia, the Roman Bologna, is given as a specific example to support Magli’s thesis on the existence of preferred solar alignments of the urban layout. Assuming that the Roman towns had been oriented to the sunrise on the day of their foundation, Magli suggested possible preferred alignments according to Roman festivals, in particular the festival of Terminalia. Of Bononia, we know the date of foundation in 189 BC, given by Livy. We will show that, according to Roman chronology and Republican calendar, it is impossible that Bononia had been oriented to the sunrise on the day given by Livy. The discrepancy is huge. Moreover, the direction of the decumanus cannot match the dates of Terminalia for 189 BC. As we will stress in the discussion, the problem of the discrepancy between the historical dates of Roman chronology and the Julian dates, those that we can find according to an astronomical analysis, is general and must be properly considered in any archaeoastronomical analysis of Roman towns.
Από τις τοπικές στις μη τοπικές σχέσεις: η περίπτωση των παρά, αντί, εκτός/έξω
Creators: name: Πουλοπούλου, Μαρία
Publisher: name: Aristotle University of Thessaloniki
Year: 2002
Subjects: Γνωσιακή γλωσσολογία
Τοπική σχέση
Εστιακές προσαρμογές
Τοπικός δείκτης
Γραμματικοποίηση
Cognitive linguistics
Locative/spatial relationship
Focal adjustements
Spatial marker
Grammaticalization

description: Βασική υπόθεση είναι ότι οι ποικίλες και ασύνδετες μεταξύ τους μη τοπικές χρήσεις δεικτοποίησης όπως οι παρά, αντί, εκτός/έξω μπορούν να ερμηνευθούν αν αναχθούμε στην αρχική τοπική σημασία των δεικτών αυτών.
description: The main hypothesis relies on the assumption that non-local uses of markers such as παρά, αντί, εκτός/έξω can be explained by their initial local features.
description: Τομέας γλωσσολογίας
Cluster formation in mesoscopic systems
Creators: name: Kartashova, Elena
name: Mayrhofer, Guenther
Publisher: name: arXiv
Year: 2007
Subjects: subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Physical sciences

description: Graph-theoretical approach is used to study cluster formation in mesocsopic systems. Appearance of these clusters are due to discrete resonances which are presented in the form of a multigraph with labeled edges. This presentation allows to construct all non-isomorphic clusters in a finite spectral domain and generate corresponding dynamical systems automatically. Results of MATHEMATICA implementation are given and two possible mechanisms of cluster destroying are discussed.
Τα ζητήματα της προκοπής και της παιδεύσεως στη φιλοσοφία του Επίκτητου
Creators: name: Χριστοδούλου, Ιωάννης Σωτηρίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2002
Subjects: Προκοπή
Παίδευση
Προαίρεσις
Φύση
Φαντασία
Αρχαία φιλοσοφία
Στωικισμός
Ηθική φιλοσοφία
Γνωσιοθεωρία
Φιλοσοφία της παιδείας
Ancient philosophy
Theory of knowledge
Stoicism
Moral philosophy
Philosophy of education
Moral progress
Will
Nature
Imagination

description: Στις "Διατριβές" και το "Εγχειρίδιον" ο Επίκτητος δίνει περιεχόμενο στις έννοιες της "προκοπής" και της "παιδεύσεως", δύο έννοιες κομβικής σημασίας για το στωικισμό συγκεκριμένα αλλά και γενικά για μιά αναστοχαστική προσέγγιση του ίδιου του φιλοσοφείν, που θα στόχευε στη διευκρίνιση τόσο της έννοιας της φιλοσοφικής ωρίμανσης όσο και της έννοιας της φιλοσοφικής παιδεύσεως. Οι αρχαίοι Στωικοί δεν κατάφεραν να προσδιορίσουν την έννοια της προκοπής. Δεν εξηγούσαν δηλαδή επαρκώς την κατάσταση του υποκειμένου το οποίο άφηνε πίσω του τον "ιδιώτη", τον κοινό άνθρωπο και έμπαινε στο δρόμο προς την ηθική τελείωση, αλλά συνάμα δεν ήταν ακόμα σοφός. Ο Επίκτητος έδωσε μεγάλη βαρύτητα στο στάδιο του προκόπτοντος, και επανέρχεται στον προσδιορισμό του σταδίου αυτού πολύ συχνά στις "Διατριβές"
description: In the "Discourses" and the "Encheiridion", Epictetus gives content to the concepts of "moral progress" and "education", two notions that are of central importance to stoicism specifically, and more generally to a retrospective approach to the very practice of philosophy, which would aim at clarifying both the concept of philosophical maturation and that of philosophical education.The ancient stoci philosophers never succeeded in defining the concept of progress. That is they did not sufficiently explain the state of the subject who has left the private sell, the orinary man behind and has entered upon the path of moral perfection but has not yet achieved wisdom. Epictetus attached great importance to the state of progressing of advancing and frequently returned to the definition of it in his "Discourses"
CHARA Array Measurements of the Angular Diameters of Exoplanet Host Stars
Creators: name: Baines, Ellyn K.
name: McAlister, Harold A.
name: Brummelaar, Theo A. ten
name: Turner, Nils H.
name: Sturmann, Judit
name: Sturmann, Laszlo
name: Goldfinger, P. J.
name: Ridgway, Stephen T.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have measured the angular diameters for a sample of 24 exoplanet host stars using Georgia State University's CHARA Array interferometer. We use these improved angular diameters together with Hipparcos parallax measurements to derive linear radii and to estimate the stars' evolutionary states.
Gas clumping in the outskirts of the Virgo cluster
Creators: name: Mirakhor, M. S.
name: Walker, S. A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Observations of the ICM in the outskirts of the Virgo cluster with Suzaku have found the gas mass fraction in the northern direction to be significantly above the expected level, indicating that there may be a very high level of gas clumping on small scales in this direction. Here, we explore the XMM-Newton data in the outskirts of Virgo, dividing it into a Voronoi tessellation to separate the bulk ICM component from the clumped ICM component. As the nearest galaxy cluster, Virgo's large angular extent allows the spatial scale of the tessellation to be much smaller than has been achieved using the same technique on intermediate redshift clusters, allowing us to probe gas clumping on the scales down to 5$\times$5 kpc. We find that the level of gas clumping in the outskirts to the north is relatively mild, ($\sqrt{C} < 1.1$), suggesting that our point-source detection procedure may have excluded a significant fraction of clumps. While correcting for clumping brings the gas mass fraction at $r_{200}$ into agreement with the universal gas mass fraction, the values outside $r_{200}$ remain significantly above it. This may suggest that non-thermal pressure support in the outskirts to the north is significant, and we find that a non-thermal pressure support at the level of 20 per cent of the total pressure outside $r_{200}$ can explain the high gas mass fraction to the north, which is in agreement with the range expected from simulations.
description: 10 pages, 12 figures, 1 table. Accepted for publication in MNRAS
Sentiment analysis and emotion recognition: Evolving the paradigm of communication within data classification
Creators: name: Gross, Ted
Publisher: name: figshare
Year: 2021
Subjects: subject: 80199 Artificial Intelligence and Image Processing not elsewhere classified
subject: FOS: Computer and information sciences
subject: 80102 Artificial Life
subject: 80109 Pattern Recognition and Data Mining

description: Abstract
 The process of sentiment analysis and emotion recognition (SAER) entails using artificial intelligence components and algorithms to extract emotions and sentiments from online texts, such as tweets. The information extracted can then be used by marketing, customer support and public relations teams to foster positive consumer attitudes. Advances in this discipline, however, are being hindered by two significant obstacles. First, although ‘emotion’ and ‘sentiment’ are distinct entities that require distinct analysis, there is no agreed definition to distinguish between the two. Secondly, the nature of language within the electronic medium has evolved to include much more than textual statements, including (but not limited to) acronyms, emojis and other visuals, such as video (in its many forms). As visual communication lacks universal interpretation, this can lead to erroneous analysis and conclusions, even where there is a differentiation between emotion and sentiment. This paper uses examples and case studies to explain the theoretical basis of the problem. It also offers conceptual direction regarding how to make SAER more accurate.
Amplification and variability of the AGN X-ray emission due to microlensing
Creators: name: Popovic, L. C.
name: Jovanovic, P.
name: Petrovic, T.
name: Shalyapin, V. N.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We consider the contribution of microlensing to the AGN Fe K$α$ line and X-ray continuum amplification and variation. To investigate the variability of the line and X-ray continuum, we studied the effects of microlensing on quasar X-ray spectra produced by crossing of a microlensing pattern across a standard relativistic accretion disk. To describe the disk emission we used a ray tracing method considering both metrics, Schwarzschild and Kerr. We found that the Fe K$α$ and continuum may experience significant amplification by a microlensing event (even for microlenses of very small mass). Also, we investigate a contribution of microlensing to the X-ray variability of high-redshifted QSOs, finding that cosmologically distributed deflector may contribute significantly to the X-ray variability of high-redshifted QSOs (z>2).
description: 4 pages, 2 figures, accepted for publication in Astronomische Nachrichten, proceedings of the ESAC Workshop "Variable and Broad Iron Lines around Black Holes"
Χρωματογραφική συμπεριφορά και προσδιορισμός αντιβηχικών - αποχρεμπτικών φαρμάκων σε σκευάσματα και βιολογικά υγρά με ΥΧΥΑ
Creators: name: Μάλλιου, Ελευθερία Θωμά
Publisher: name: Aristotle University of Thessaloniki
Year: 2002
Subjects: Υγρή χρωματογραφία υψηλής απόδοσης
Αμβροξόλη
Βρωμεξίνη
Κλοβουτινόλη
Βουταμυράτη
Πεντοξυβερίνη
High performance liquid chromatography
Ambroxol
Bromhexine
Clobutinol
Butamyrate(Butamirate)
Pentoxyverine

description: Στην παρούσα διατριβή μελετήθηκαν και προσδιορίστηκαν τα αντιβηχικά-αποχρεμπτικά φάρμακα αμβροξόλη, βρωμεξίνη, κλοβουτινόλη, βουταμυράτη και πεντοξυβερίνη με ΥΧΥΑ αντίστροφης φάσης. Αρχικά διερευνήθηκε η χρωματογραφική τους συμπεριφορά σε σχέση με ορισμένες παραμέτρους που μεταβάλλουν τις χρωματογραφικές συνθήκες και επηρεάζουν τη διάρκεια της ανάλυσης, τη διαχωριστική ικανότητα των συστημάτων προσδιορισμού και την ευαισθησία της ανάλυσης. Συγκεκριμένα εξετάστηκε η επίδραση της πολικότητας του διαλύτη έκλουσης σε συνάρτηση με το PH και την περιεκτικότητα διαφόρων αλάτων στο υδατικό μέρος της κινητής φάσης. Για την παρασκευή της κινητής φάσης επιλέχτηκαν ως διαλύτες η μεθανόλη και το ακετονιτρίλιο οι οποίοι αναμίχθηκαν σε διάφορες αναλογίες με νερό. Με βάση τα συμπεράσματα που προέκυψαν αναπτύχθηκαν συγκεκριμένα χρωματογραφικά συστήματα και επιτεύχθηκε ταυτοχρόνως διαχωρισμός και ποσοτικός προσδιορισμός ορισμένων επιλεκτικά φαρμάκων στα ούρα και στο μητρικό γάλα μετά την απομόνωσή τους με την τεχνική της εκχύλισης υγρού-υγρού.
description: In the present thesis, the anti-cough-anti congestion drugs ambroxol, bromhexine, clobutinol, butamyrate and pentoxyverine were studied and determined with the use of HPLC-reversed-phase. Initially, the chromatographic behaviour of each compound was investigated in relation to certain parameters which alter chromatographic conditions of analysis. Specifically, the effect of polarity of the solvents was studied in relation to pH and the content of various types of salts, added in aqueous portion of mobile phase. For mobile preparation, solvents such as methand and acetonitrile were selected and were mixed in various concentrations with aqueous solution. Based on conclusions arising from the already mentioned studies, specific chromatographic systems were developed. Suggested systems can be used either for the determination of the pharmaceutical compounds in multi-component formulations. Some of the above drugs were isolated from spiked biological fluids such as urine and breast milk by the liquid-liquid extraction and the(were) determinated by HPLC
A case study in the restructuring of linguistic knowledge among adult ESL students
Creators: name: Fazio, Ronald John
Publisher: name: University of British Columbia
Year: 2008

description: This study examines two cases of Japanese learners involved in an eight-month university exchange program in Canada. Case A, comprised of one male and one female subject, was classified as containing "advanced" speakers of English, while Case B, also composed of one male and one female subject, was classified as containing "novice" speakers of English. For the first time in their careers as second language students, these subjects experienced a task-based, process approach to learning mediated through student group membership. The study attempted a psycholinguistic analysis of individual styles of second language acquisition (SLA) through an examination of the use of three kinds of performance features: self repairs, repeats and hesitation pauses. It also attempted to draw a sociolinguistic portrait of these subjects as learners whose strategies for language acquisition were related to educational and cultural factors. Although the findings in psycho- and sociolinguistic areas of inquiry were inconclusive regarding the role of restructuring, the results indicated that changes in procedural knowledge regarding strategic behaviour occurred for both cases, and that a more autonomous attitude towards group control of behaviour was articulated by the Case A subjects. Changes in orientations to learning as measured by performance feature use were not significant, although a trend towards decreased use of hesitation pauses in Case B suggested a reduced reliance on unverbalized planning. Finally, both cases demonstrated growth in the use of such reading strategies as scanning for main ideas and using contextual clues.
Constraint optimization and $\mathcal{SU}(N)$ quantum control landscapes
Creators: name: Birtea, Petre
name: Casu, Ioan
name: Comanescu, Dan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Mathematical Physics (math-ph)
subject: Optimization and Control (math.OC)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: 53Bxx, 53C17, 58Cxx, 81Q93, 93B27

description: We develop the embedded gradient vector field method, introduced in [8] and [9], for the case of the special unitary group $\mathcal{SU}(N)$ regarded as a constraint submanifold of the unitary group $\mathcal{U}(N)$. The optimization problem associated to the trace fidelity cost function defined on $\mathcal{SU}(N)$ that appears in the context of $\mathcal{SU}(N)$ quantum control landscapes is completely solved using the embedded gradient vector field method. We prove that for $N\geq 5$, the landscape is not $\mathcal{SU}(N)$-trap free, there are always kinematic local extrema that are not global extrema.
Equivariant BRST quantization and reducible symmetries
Creators: name: Rogers, Alice
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Working from first principles, quantization of a class of Hamiltonian systems with reducible symmetry is carried out by constructing first the appropriate reduced phase space and then the BRST cohomology. The constraints of this system correspond to a first class set for a group G and a second class set for a subgroup H. The BRST operator constructed is equivariant with respect to H. Using algebraic techniques analogous to those of equivariant de Rham theory, the BRST operator is shown to correspond to that obtained by BV quantization of a class of systems with reducible symmetry. The 'ghosts for ghosts' correspond to the even degree two generators in the Cartan model of equivariant cohomology. As an example of the methods developed, a topological model is described whose BRST quantization relates to the equivariant cohomology of a manifold under a circle action.
description: 23 pages LaTeX. Some refrences added and some clarification made to text
Βελτιστοποίηση τοπικού γεωειδούς από ετερογενή δεδομένα
Creators: name: Πασχαλάκη, Ελένη Μ.
Publisher: name: Aristotle University of Thessaloniki
Year: 2002
Subjects: Γεωειδές
Βελτιστοποίηση
Συναρτήσεις συμμεταβλητότητας
Σημειακή προσαρμογή
Τεχνική "απομάκρυνσης-επαναφοράς"
Δεδομένα προσομοίωσης
Geoid
Optimization
Covariance functions
Least square collocation
"Remove-restore" techique
Simulated data

description: Η παρούσα διατριβή πραγματεύεται τη βελτιστοποίηση υψομέτρων τοπικού γεωειδούς, με τη χρήση ετερογενών πηγών δεδομένων. Οι συνήθεις μέθοδοι προσδιορισμού των υψομέτρων του γεωειδούς, όπως είναι η βαρυτημετρική μέθοδος και ο συνδυασμός μετρήσεων GPS και γεωμετρικής χωροστάθμησης παρόλο που προσφέρουν μια ικανοποιητική λύση, εντούτοις δεν μπορούν να απομακρύνουν τα σφάλματα που αναφέρονται στα μικρού και μεσαίου μήκους κύματα. Ετσι εξετάζεται μια συνδυαστική προσέγγιση των δύο παραπάνω μεθόδων, προκειμένου να επωφεληθούμε απο τα πλεονεκτήματα της καθεμιάς. Αρχικά εφαρμόστηκε η διαδικασία βελτιστοποίησης των υψομέτρων ενός τοπικού γεωειδούς με πραγματικά δεδομένα και στη συνέχεια με δεδομένα προσομοίωσης. Από τα αποτελέσματα των αριθμητικών εφαρμογών προέκυψε ότι η βελτίωση ενός υπάρχοντος βαρυτημετρικού γεωειδούς εξαρτάται από κάποιες παραμέτρους που έχουν σχέση με τα τοπικά χαρακτηριστικά κάθε περιοχής και φυσικά με την ακρίβεια, το πλήθος και την κατανομή των διαθέσιμων δεδομένων
description: This Ph. D. thesis focuses on the optimization of a local geoid, using heterogeneous data. Common techniques for geoid determination (such as gravimetry and/or combined GPS/leveling) even though they do provide an acceptable solution, they cannot adjust errors wich are referred to law and medium wavelenghts of the gravity field. Thus, a combined approach of these methods is investigated in order to benefit from the advantages of each technique. Firstly, the optimization method for a local geoid applied applied on real data and then on simulated data. From the results of our numerical applications, we conclude that the improvement of an existing gravimetric geoid depends on some parameters which are connected to the local characteristics of each area and of course with the accuracy, the amount and the distribution of the available area.
description: Περιέχει παράρτημα
Governance in Action
Creators: name: Pendino, Romina
name: Eunice, Mercado Lara
name: Fariello, María Inés
name: Formoso, Jesica
name: Ación, Laura
name: Míguez, María Paz
Publisher: name: Zenodo
Year: 2024

description: Due to unforeseen circumstances, we were urgently required to temporarily fill the position of Chair of the Advisory Council.

In this note, we explain how our governance responded with agility and impeccable agreements to address this situation.
Approximation via toy Fock space - the vacuum-adapted viewpoint
Creators: name: Belton, Alexander C. R.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 81S25 (primary); 46L53 (secondary)

description: After a review of how Boson Fock space (of arbitrary multiplicity) may be approximated by a countable Hilbert-space tensor product (known as toy Fock space) it is shown that vacuum-adapted multiple quantum Wiener integrals of bounded operators may be expressed as limits of sums of operators defined on this toy space, with strong convergence on the exponential domain. The vacuum-adapted quantum Ito product formula is derived with the aid of this approximation and a brief pointer is given towards the unbounded case.
Equation of State Dependence of Gravitational Waves in Core-Collapse Supernovae
Creators: name: Andersen, Oliver Eggenberger
name: Zha, Shuai
name: Schneider, André da Silva
name: Betranhandy, Aurore
name: Couch, Sean M.
name: O'Connor, Evan P.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Gravitational waves (GWs) provide unobscured insight into the birthplace of neutron stars (NSs) and black holes in core-collapse supernovae (CCSNe). The nuclear equation of state (EOS) describing these dense environments is yet uncertain, and variations in its prescription affect the proto-neutron star (PNS) and the post-bounce dynamics in CCSNe simulations, subsequently impacting the GW emission. We perform axisymmetric simulations of CCSNe with Skyrme-type EOSs to study how the GW signal and PNS convection zone are impacted by two experimentally accessible EOS parameters, (1) the effective mass of nucleons, $m^\star$, which is crucial in setting the thermal dependence of the EOS, and (2) the isoscalar incompressibility modulus, $K_{\rm{sat}}$. While $K_{\rm{sat}}$ shows little impact, the peak frequency of the GWs has a strong effective mass dependence due to faster contraction of the PNS for higher values of $m^\star$ owing to a decreased thermal pressure. These more compact PNSs also exhibit more neutrino heating which drives earlier explosions and correlates with the GW amplitude via accretion plumes striking the PNS, exciting the oscillations. We investigate the spatial origin of the GWs and show the agreement between a frequency-radial distribution of the GW emission and a perturbation analysis. We do not rule out overshoot from below via PNS convection as another moderately strong excitation mechanism in our simulations. We also study the combined effect of effective mass and rotation. In all our simulations we find evidence for a power gap near $\sim$1250 Hz, we investigate its origin and report its EOS dependence.
description: 21 pages, 14 figures
Ανάπτυξη φωτογραμμετρικών τεχνικών για την αυτόματατη παρακολούθηση της κίνησης αντικειμένων
Creators: name: Σεχίδης, Λάζαρος Α.
Publisher: name: Aristotle University of Thessaloniki
Year: 2003
Subjects: Ψηφιακή Φωτογραμμετρία
Παρακολούθηση
Υπόβαθρο
Ταυτοποίηση
Συσχέτιση
Κλειστοί κόσμοι
Digital Photogrammetry
Tracking
Background estimation
Matching Algorithm
Correlation
Closed worlds

description: Η παρακολούθηση πολλών αντικειμένων σε "πραγματικές συνθήκες" είναι ένα από τα δυσκολότερα προβλήματα στην μηχανική όραση, αφού η συμπεριφορά-κίνηση των αντικειμένων είναι απρόβλεπτη και δεν μπορεί να προκαθοριστεί. Είναι επίσης μία διαδικασία που εξαρτάται απόλυτα από το είδος της εφαρμογής στο οποίο θα χρησιμοποιηθεί. Για το λόγο αυτό δεν υπάρχει μία γενική μεθοδολογία η οποία να ικανοποιεί και να λύνει όλα τα προβλήματα παρακολούθησης. Ετσι, χρειάζονται διαφορετικοί αλγόριθμοι και μεθοδολογίες για κάθε διαφορετική εφαρμογή. Παρόλα αυτά, είναι δυνατή η ταξινόμηση εφαρμογών σε δύο γενικές κατηγορίες : αυτές στις οποίες οι κάμερες παραμένουν σταθερές και αυτές στις οποίες οι κάμερες κινούνται. Η διατριβή ασχολείται με τις εφαρμογές της πρώτης κατηγορίας χρησιμοποιώντας την τεχνική των "κλειστών κόσμων". Οριοθετεί το πρόβλημα της παρακολούθησης τις πιθανές κινήσεις των αντικειμένων και προτείνει μεθοδολογίες και λύσεις για το γενικό πρόβλημα. Τα αποτελέσματα που επιτεύχθηκαν είναι πολλά υποσχόμενα αφού αγγίζουν το 100% επιτυχίας στην περίπτωση μεμονωμένης κίνησης και στην κίνηση δύο αντικειμένων.
description: Tracking of multiple objects from "real world" is one of the most complicated problems in computer vision since the behavior/motion of these objects is unpredictable and cannot be assumed. Tracking is also "application depended" task ; there is no one general tracking methodology for solving all tracking problems. Therefore, different algorithms and procedures are needed and used for different applications. However, it is possible to rank tracking applications in two general categories : the ones that need a moving camera and the ones where a stable camera is enough. This dissertation deals with the second category and the technique of the "closed world" for object tracking. It defines the lower level problem, the possible circumstances of the objects movements and the algorithms to solve some of the tracking situations. The obtained experimental results are pretty promising, approaching 100% hit rate, even in cases of two-object collision. In three-object collision occasional re-initialization is required.
description: Περιέχει παραρτήματα.
Properties of the galaxy population in hydrodynamical simulations of clusters
Creators: name: Saro, A.
name: Borgani, S.
name: Tornatore, L.
name: Dolag, K.
name: Murante, G.
name: Biviano, A.
name: Calura, F.
name: Charlot, S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a study of the galaxy population predicted by hydrodynamical simulations for a set of 19 galaxy clusters based on the GADGET-2 Tree+SPH code. These simulations include gas cooling, star formation, a detailed treatment of stellar evolution and chemical enrichment, as well as SN energy feedback in the form of galactic winds. We compute the spectro-photometric properties of the simulated galaxies. All simulations have been performed for two choices of the stellar initial mass function: a standard Salpeter IMF, and a top-heavier IMF. Several of the observational properties of the galaxy population in nearby clusters are reproduced fairly well by simulations. A Salpeter IMF is successful in accounting for the slope and the normalization of the color-magnitude relation for the bulk of the galaxy population. Simulated clusters have a relation between mass and optical luminosity which generally agrees with observations, both in normalization and slope. We find that galaxies are generally bluer, younger and more star forming in the cluster outskirts, thus reproducing the observational trends. However, simulated clusters have a total number of galaxies which is significantly smaller than the observed one, falling short by about a factor 2-3. Finally, the brightest cluster galaxies are always predicted to be too massive and too blue, when compared to observations, due to gas overcooling in the core cluster regions, even in the presence of a rather efficient SN feedback.
description: 15 pages, 17 figures, to appear in MNRAS
title: Impact des positions de la femme enceinte durant son sommeil sur la mort in utero tardive
title: Impact des positions de la femme enceinte durant son sommeil sur la mort in utero tardive
titleType: AlternativeTitle
Creators: name: Brianza, Lorene
name: Ciampa, Alyssa
name: Tavagnutti, Perrine
Publisher: name: Unknown
Year: 0
Subjects: subject: position de sommeil
subject: habitudes de sommeil
subject: décubitus dorsal
subject: décubitus latéral
subject: mort in utero
subject: hesav TB SF

description: But : Le but de cette revue de littérature est de déterminer l’impact des positions de la femme enceinte durant son sommeil sur la mort in utero (MIU) tardive afin d’évaluer la pertinence des nouvelles recommandations sur la position de sommeil au cours de la grossesse. Méthode : La recherche d’articles scientifiques a été effectuée dans les bases de données PubMed, CINAHL et MIDIRS. Huit articles scientifiques ont été retenus. Résultats : Les résultats des études analysées tendent vers les mêmes conclusions : la position de sommeil maternel en décubitus dorsal (DD) pourrait représenter un facteur de risque dans la MIU. Il faudrait ainsi favoriser le décubitus latéral gauche (DLG) voire le décubitus latéral droit (DLD). La sage-femme serait alors, la professionnelle de la santé la plus adaptée pour guider et informer la femme sur cette thématique. Conclusion : La réalisation de cette revue de littérature a permis de mettre en évidence que la position de sommeil maternel pourrait constituer un facteur de risque modifiable dans la MIU. Cependant, il semblerait qu’elle ne serait pas la seule étiologie mais qu’elle ferait partie d’un ensemble de risque, qui cumulés, représenterait un réel risque de MIU. Par ailleurs, en raison des nombreux biais présents, des études complémentaires seraient nécessaires afin d’évaluer la pertinence de telles recommandations anténatales.
Ο μοναχισμός κατά τον Αγιον Συμεών Θεσσαλονίκης
Creators: name: Μακρής, Γεράσιμος Σπυρανδρέα
Publisher: name: Aristotle University of Thessaloniki
Year: 2002
Subjects: Μοναχική κουρά
Μοναχοί και κληρικοί
Μοναχικές διατάξεις και τελετές
Μοναχικές αρετές
Symeon archbishop of Thessaloniki
Monastic tonsure
Monks and clergy
Monastic rites
Monastic virtues

description: Η παρούσα διατριβή μελέτησε και εξάντλησε όλα τα γραπτά κείμενα του Αγίου Συμεών, βρίσκοντας και κατατάσσοντας κάθε τι που είχε σχέση με τον μοναχισμό, αναλύοντας και σχολιάζοντας πάντα ταύτα αλλά και συγκρίνοντας αυτά, κατά δύναμη με άλλα πατερικά κείμενα.
description: This dissertation studied and exhausted all the written works of St. Symeon of Thessaloniki, identifying and classifying everything that was related with monasticism, analyzing and commenting on these and comparing with other texts of Church Fathers.
Prospect and implications of $cg\to bH^+\to b A W^+$ production at the LHC
Creators: name: Hou, Wei-Shu
name: Modak, Tanmoy
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We study the prospect for discovering the $cg\to bH^+\to b A W^+$ process at the LHC. Induced by the top-flavor changing neutral Higgs coupling $ρ_{tc}$, the process may emerge if $m_{H^+} > m_A + m_{W^+}$, where $H^+$ and $A$ are charged and $CP$-odd Higgs bosons in the general two Higgs Doublet Model (g2HDM). We show that the $cg\to bH^+\to b A W^+$ process can be discovered at LHC Run 3, while the full Run 2 data at hand can constrain the parameter space significantly by searching for the same-sign dilepton final state. The process has unique implications on the hint of $gg\to A \to t \bar t$ excess at $m_A\approx 400$ GeV reported by CMS. When combined with other existing constraints, the $cg\to bH^+\to b A W^+$ process can essentially rule out the g2HDM explanation of such an excess.
description: matches the published version
Particle acceleration at shock waves: particle spectrum as a function of the equation of state of the shocked plasma
Creators: name: Morlino, G.
name: Blasi, P.
name: Vietri, M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We determine the spectrum of particles accelerated at shocks with arbitrary speed and arbitrary scattering properties for different choices of the equation of state of the downstream plasma. More specifically we consider the effect of energy exchange between the electron and proton thermal components downstream, and the effect of generation of a turbulent magnetic field in the downstream plasma. The slope of the spectrum turns out to be appreciably affected by all these phenomena, especially in the Newtonian and trans-relativistic regime, while in the ultra-relativistic limit the universal spectrum $s\approx 4.3$ seems to be a very solid prediction.
description: 21 pages, 8 figs
Guido Mattia Gallerani, Roland Barthes e la tentazione del romanzo
Creators: name: Marangolo, Luca
Publisher: name: Università degli Studi di Cagliari
Year: 2015

description: La fulgida figura di Roland Barthes si staglia solitaria brillando di una luce tutta sua, al centro esatto del panorama novecentesco, e si offre in una forma strana ai nostri occhi, che sono figli ormai di un nuovo secolo.                    Si, perché Barthes è senza dubbio una delle personalità cruciali, preminenti e più influenti della cultura letteraria e filosofica del Novecento: citatissimo, brillante innovatore, sagace analista e critico dall’inebriante raffinatezza. Tutte queste doti meravigliose non possono però nascondere il fatto che Barthes non è stato solo il più grande fra i critici, è stato anche il più inafferrabile.
description: Between, Vol 5, N° 9 (2015): Censura e auto-censura
The AGORA High-resolution Galaxy Simulations Comparison Project. III: Cosmological zoom-in simulation of a Milky Way-mass halo
Creators: name: Roca-Fàbrega, Santi
name: Kim, Ji-hoon
name: Hausammann, Loic
name: Nagamine, Kentaro
name: Powell, Johnny W.
name: Shimizu, Ikkoh
name: Ceverino, Daniel
name: Lupi, Alessandro
name: Primack, Joel R.
name: Quinn, Thomas
name: Revaz, Yves
name: Velázquez, Héctor
name: Abel, Tom
name: Buehlmann, Michael
name: Dekel, Avishai
name: Dong, Bili
name: Hahn, Oliver
name: Hummels, Cameron B.
name: Kim, Ki-won
name: Smith, Britton D.
name: Strawn, Clayton J.
name: Teyssier, Romain
name: Turk, Matthew
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: We present a suite of high-resolution cosmological zoom-in simulations to $z=4$ of a $10^{12}\,{\rm M}_{\odot}$ halo at $z=0$, obtained using seven contemporary astrophysical simulation codes widely used in the numerical galaxy formation community. Physics prescriptions for gas cooling, heating, and star formation, are similar to the ones used in our previous {\it AGORA} disk comparison but now account for the effects of cosmological processes. In this work, we introduce the most careful comparison yet of galaxy formation simulations run by different code groups, together with a series of four calibration steps each of which is designed to reduce the number of tunable simulation parameters adopted in the final run. After all the participating code groups successfully completed the calibration steps, we reach a suite of cosmological simulations with similar mass assembly histories down to $z=4$. With numerical accuracy that resolves the internal structure of a target halo, we find that the codes overall agree well with one another in e.g., gas and stellar properties, but also show differences in e.g., circumgalactic medium properties. We argue that, if adequately tested in accordance with our proposed calibration steps and common parameters, the results of high-resolution cosmological zoom-in simulations can be robust and reproducible. New code groups are invited to join this comparison by generating equivalent models by adopting the common initial conditions, the common easy-to-implement physics package, and the proposed calibration steps. Further analyses of the simulations presented here will be in forthcoming reports from our Collaboration.
description: Accepted for publication to the ApJ. The simulation snapshots used in this paper will be made publicly available in a user-friendly interface. The announcement of the data release will be posted on the AGORA Project webpage (www.agorasimulations.org). Early access to the data can be provided upon request to the authors, or to the project coordinator (sroca01@ucm.es, santacruzgalaxy@gmail.com)
ODESSA, an adaptation of automotive radar sensor for avionic application
Creators: name: L.M. Travaglini
name: I. De Angelis
Publisher: name: Zenodo
Year: 2021
Subjects: Avionic
Automotive
Radar sensor
Anti Collision
Mid Air Collision

description: Mid-air, near mid-air, and on-ground collisions are among the main causes of accident in general aviation. The aim of ODESSA (Obstruction DEtection Sensor for Surveillance on Aircraft) project is to provide both fixed and rotary wing aircraft, piloted on board or remotely, with a small, light, and affordable obstacle detection device. This to prevent collisions while manoeuvring close to the terrain (i.e. take-off and landing phases) or on-ground (i.e. taxiing phase). This objective has been achieving by exploiting the experience gained in the automotive market, where low-cost but trustworthy radars, sometimes combined with video cameras, provide vehicles with reliable collision detection capabilities. Named sensors are based on millimetre waves radar principles. Radar provides target detection and camera, if present, improves detection reliability (ghost echo removal). This paper investigates and demonstrates the technical feasibility of adapting an automotive radar sensor for avionic application needs by integrating a Frequency Modulated Continuous Wave (FMCW) 76.5 GHz radar sensor on a Remoted Piloted Aircraft System (RPAS) for obstacle detection purposes. The combined application of Range-Doppler FFT, CFAR techniques for targets detection, and Direction-of-Arrival (DoA) estimation methods such as Range-Angle FFT, Barlett beamformer, MVDR beamformer and MUSIC/SODIN-MUSIC algorithms will be discussed in terms of results and performance. A first prototype, composed of radar sensor and camera, has been realized and tested on the field. The prototype has been rolled out in two international events as the 53rd Salon Internationale de l’Aéronautique et de l’Espace and the Maker Fair Rome 2019. The development of the system in the near future will include the integration of artificial intelligence techniques applied to computer vision, for the identification and classification of obstacles. This will remarkably enhance the collision avoidance capabilities.
Effectiveness of a Pre-Operative General Anesthesia Educational Video on Parents’ Knowledge and Anxiety
Creators: name: Abdelaziz, Aya
Publisher: name: University of Illinois at Chicago
Year: 2024

description: Purpose: This two-arm randomized controlled trial aims to evaluate if providing an educational video in addition to written and verbal pre-operative instructions about general anesthesia (GA) reduces caregivers’ anxiety and increases knowledge more than written/verbal instructions alone. Methods: Participants were recruited from a post-graduate pediatric dentistry clinic between August-December 2023. Inclusion criteria were English- or Spanish-speaking caregivers of healthy children aged 3-6 years receiving dental treatment under GA. All caregivers completed a baseline questionnaire and the Amsterdam Preoperative Anxiety and Information Scale (APAIS) at the pre-operative visit. Participants were randomized to receive intervention (eight-minute educational video in addition to written and verbal instructions) or control (written and verbal instructions only). A follow-up questionnaire was administered on the day of GA to re-assess knowledge and anxiety. Results: Fifty-five caregivers were recruited, and 30 are included in preliminary analysis (17 intervention, 13 controls). Twelve were excluded or lost to follow-up, and 13 are awaiting their child’s GA. Caregivers were mean age 32.8 years (SD=7.2), 83% female, 50% Hispanic, with 40% having a high school education or less. Children were 4.6 years (SD=0.97), 66% female, and 97% Medicaid-enrolled. APAIS anxiety scores decreased significantly in the intervention group (P=0.007), but not the control group (P=0.10). Both groups had insignificant increased knowledge scores, and there was no significant difference between the two groups. Conclusions: An educational pre-operative video was effective in reducing caregivers’ anxiety about GA, but the variability in video watching frequency/behavior by intervention participants might have impacted its overall effectiveness in improving knowledge.