cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Ανάλυση της Χρήσης του Twitter από τα Ελληνικά Πολιτικά Κόμματα
Creators: name: Μακρόπουλος, Ιάκωβος Πέτρου
Publisher: name: Aristotle University of Thessaloniki
Year: 2017
Subjects: Τουίτερ
Μεγάλοι Όγκοι δεδομένων
Ανάλυση Κοινωνικών Μέσων Δικτύωσης
Twitter
Big Data
Social Mining

description: Τα μέσα κοινωνικής δικτύωσης χρησιμοποιούνται όλο και περισσότερο στις μέρες μας είτε για λόγους ψυχαγωγίας και ενημέρωσης είτε για επαγγελματικούς σκοπούς. Πλέον, έχουν ενταχθεί στη ζωή της πολιτικής, αφού τόσο οι υποψήφιοι βουλευτές όσο και τα πολιτικά κόμματα τα χρησιμοποιούν, για να προβάλουν τις θέσεις τους, με απώτερο στόχο να κερδίσουν τους ψηφοφόρους-χρήστες των κοινωνικών αυτών δικτύων. Το «Twitter» αποτελεί το κυρίαρχο μέσο επικοινωνίας για να εκφράσουν οι άνθρωποι τις απόψεις τους και να υποστηρίξουν τις πολιτικές ιδέες των αγαπημένων τους πολιτικών κομμάτων και για αυτό το λόγο αποτελεί το βασικό εργαλείο της συγκεκριμένης έρευνας. Σε αυτή την εργασία εξετάζονται τα tweets 9 κομμάτων στην Ελλάδα και μετά από επεξεργασίας τους στο περιβάλλον R Studio αναδεικνύονται τα θέματα που προβάλει το καθένα στη μάχη του κομματικού-πολιτικού ανταγωνισμού και γίνεται ανάλυση των συναισθημάτων που εκφράζουν μέσα από τον πολιτικό τους λόγο. Από τα αποτελέσματα προκύπτει ότι τα κόμματα εκφράζονται στο Twitter, κυρίως, αρνητικά με κεντρικό συναίσθημα το φόβο για το αύριο.
description: Social media are nowadays increasingly used for entertainment, information or business purposes. They are now a part of politics, as both candidate MPs and political parties use them to promote their positions with the ultimate goal of winning voters-users of these social networks. Twitter is the dominant means of communication for people to express their views and support the political ideas of their beloved political parties and is therefore the main tool of this research. This paper examines the tweets of 9 political parties in Greece and, after their statistical analysis in the R Studio environment, highlights the issues that each one puts forward in the party-political competition and examines the emotions they express through their political speech. The results show that parties are expressed in Twitter, mainly, negatively with the fear of tomorrow as a central feeling
Estimates and structure of $α$-harmonic functions
Creators: name: Bogdan, Krzysztof
name: Kulczycki, Tadeusz
name: Kwaśnicki, Mateusz
Publisher: name: arXiv
Year: 2006
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 31C35, 60J50 (Primary), 31B05, 60G51 (Secondary)

description: We prove a uniform boundary Harnack inequality for nonnegative harmonic functions of the fractional Laplacian on arbitrary open set $D$. This yields a unique representation of such functions as integrals against measures on $D^c\cup \{\infty\}$ satisfying an integrability condition. The corresponding Martin boundary of $D$ is a subset of the Euclidean boundary determined by an integral test.
description: 32 pages The original publication in Probability Theory and Related Fields available at www.springerlink.com
Error resistant schemes for all-digital high definition television
Creators: name: Nasiopoulos, Panagiotis
Publisher: name: University of British Columbia
Year: 2009

description: The picture quality of digital HDTV in the presence of bit errors in the transmission channel is addressed in this thesis. New coding and data synchronization schemes which improve the performance of the picture quality are subsequently developed. I first analyze the causes of the different kinds of digital picture impairments which may arise when the compression schemes proposed by the present HDTV systems are used. All these compression schemes are Discrete Cosine Transform (DCT) based. The picture quality performance is found to suffer mostly from the proposed differential coding of the DC terms of the DCT coefficients and from the variable length coding used. Due to the differential coding of the DC terms a bit error in one of these terms will propagate to consecutive bits. The use of variable length coding, i.e., coding the different DCT terms by words of different lengths, results in the synchronization problem where the received bits do not correspond anymore to the originally intended information. I develop a new method which codes the actual values of the DC terms instead of their differences. This solves the error propagation problem without altering the overall compression ratio of the system. To solve the synchronization problem, I present a new synchronization method which restricts the effects of any bit error to a block of the picture whose size is much smaller than those presently proposed by the HDTV systems. By modifying the originally proposed schemes for HDTV with my proposed DC term encoding and synchronization schemes, the signal-to-noise ratio at which the HDTV picture suddenly deteriorates is deferred by 2.5 to 3 dB. This has a special advantage when higher order modulation transmission schemes are used. Using higher order modulation improves the bit transmission rate but increases the system’s susceptibility to noise. I then develop a novel fixed length coding method which compresses each DCT coefficient by a codeword of a fixed length. Fixed length coding methods do not suffer from the error propagation and synchronization problems inherent in the variable length coding methods. Thus, my method is extremely resistant to errors, produces high quality pictures and is easier to implement. However, it does not improve the compression ratio. It is, thus, an ideal candidate for compressing video sequences with fast motion, such as sports, where the high compression ratios obtained by the motion compensation schemes are not attainable due to the fast motion. Finally, a hybrid method that modifies the originally proposed HDTV schemes using the three above proposed methods is presented. The three modifications involve the use of the fixed length coding method, the actual DC coding method and the synchronization scheme I developed. These modifications significantly improve the picture performance of the system in the presence of noise and do not alter the overall data transmission rate.
Arithmetic E_8 lattices with maximal Galois action
Creators: name: Várilly-Alvarado, Anthony
name: Zywina, David
Publisher: name: arXiv
Year: 2008
Subjects: subject: Number Theory (math.NT)
subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: Primary: 14J26 Secondary: 11H56, 11G05.

description: We construct explicit examples of E_8 lattices occurring in arithmetic for which the natural Galois action is equal to the full group of automorphisms of the lattice, i.e., the Weyl group of E_8. In particular, we give explicit elliptic curves over Q(t) whose Mordell-Weil lattices are isomorphic to E_8 and have maximal Galois action. Our main objects of study are del Pezzo surfaces of degree 1 over number fields. The geometric Picard group, considered as a lattice via the negative of the intersection pairing, contains a sublattice isomorphic to E_8. We construct examples of such surfaces for which the action of Galois on the geometric Picard group is maximal.
description: Latex, 21 pages. Magma scripts included at the end of the source file
Εφαρμογές των Εξελικτικών Αλγορίθμων Διαφορικής Εξέλιξης (DE), Γενετικού Αλγόριθμου (GA) και Βελτιστοποίησης Σμήνους Σωματιδίων (PSO) στη Σχεδίαση Κεραιών
Creators: name: Ασλανίδης, Ιωάννης Σάββα
Publisher: name: Aristotle University of Thessaloniki
Year: 2017
Subjects: Εξελικτικοί Αλγόριθμοι
Στοιχειοκεραία
Βελτιστοποίηση
Evolutionary Algorithms
Antenna array
Optimization

description: Η παρούσα διπλωματική εργασία εκπονήθηκε στα πλαίσια του προγράμματος μεταπτυχιακών σπουδών (ΠΜΣ) Ηλεκτρονικής Φυσικής (Ραδιοηλεκτρολογίας) του Τμήματος Φυσικής του Αριστοτελείου Πανεπιστημίου Θεσσαλονίκης. Αντικείμενο τη εργασίας αποτελεί η μελέτη της εφαρμογής των εξελικτικών αλγορίθμων Διαφορικής Εξέλιξης (Differential Evolution, DE), Γενετικού Αλγόριθμου (Genetic Algorithm, GA) και Βελτιστοποίησης Σμήνους Σωματιδίων (Particle Swarm Optimization, PSO), καθώς και διαφόρων παραλλαγών τους, στη σχεδίαση κεραιών. Αρχικά στο πρώτο κεφάλαιο, παρουσιάζονται τα βασικά χαρακτηριστικά των παραπάνω τριών αλγορίθμων ώστε να αποκτήσει ο αναγνώστης τις απαραίτητες θεωρητικές πληροφορίες και να είναι σε πλήρη θέση να κατανοήσει το κυρίως θέμα της εργασίας. Στα επόμενα τρία (3) κεφάλαια, παρουσιάζονται περιληπτικά σε μια-δυο σελίδες οι εργασίες των αλγορίθμων DE, GA και PSO αντίστοιχα και γίνεται σχολιασμός και σύγκριση των αποτελεσμάτων που προέκυψαν από τις διάφορες πειραματικές διατάξεις. Στα τελευταία δύο (2) κεφάλαια, συνοψίζεται η καταγραφή των εργασιών με διάφορα γραφήματα και πίνακες μαζί με τον επίλογο, καθώς και η καταγραφή της βιβλιογραφίας που χρησιμοποιήθηκε στα πλαίσια της εργασίας
description: This thesis has been prepared within the program of postgraduate studies in Electronic Physics (Radioelectrology) of the Physics Department of Aristotle University of Thessaloniki. Object of this thesis is the study of the application of Evolutionary Algorithms (EA), such as Differential Evolution (DE), Genetic Algorithm (GA) and Particle Swarm Optimization (PSO), as well as various variations of them, in antenna synthesis. In the first chapter, the basic characteristics of those three algorithms are briefly presented, in order the reader to acquire the necessary theoretical information and be able to fully understand the main part of the thesis. In the next three (3) chapters, the papers of DE, GA and PSO algorithms are briefly presented and there is commentary and comparison for the obtained results from the different experimental arrangements. In the final two (2) chapters, the summarization of the total papers is presented with different charts and patterns, alongside with epilogue, as well as the list of the used references for the purpose of this thesis
Electron Electric Dipole Moment from Lepton Flavor Violation
Creators: name: Ayazi, Seyed Yaser
name: Farzan, Yasaman
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The general Minimal Supersymmetric Standard Model introduces new sources for Lepton Flavor Violation (LFV) as well as CP-violation. In this paper, we show that when both sources are present, the electric dipole moment of the electron, $d_e$, receives a contribution from the phase of the trilinear $A$-term of staus, $ϕ_{A_τ}$. For $ϕ_{A_τ}=π/2$, the value of $d_e$, depending on the ratios of the LFV mass elements, can range between zero and three orders of magnitude above the present bound. We show that the present bound on $d_e$ rules out a large portion of the CP-violating and the LFV parameter space which is consistent with the bounds on the LFV rare decays. We show that studying the correlation between $d_e$ and the P-odd asymmetry in $τ\to eγ$ helps us to derive a more conclusive bound on $ϕ_{A_τ}$ We also discuss the possibility of cancelation among the contributions of different CP-violating phases to $d_e$.
description: 35 pages, 9 figures
An Association in the Aquila Star-Forming Region: High Resolution Infrared Spectroscopy of T Tauri Stars
Creators: name: Rice, E. L.
name: Prato, L.
name: McLean, I. S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present the properties of a group of young stars associated with the well-studied T Tauri star system AS 353, located in the Aquila star-forming region. The association is identified using radial velocity measurements of sample objects selected from the Herbig and Bell Catalog based on their spatial proximity to AS 353. Radial velocities of nine objects were measured from multi-epoch high-resolution (R~30,000) H-band spectra obtained with NIRSPEC on Keck II. High-resolution K-band spectra were also obtained for most of the sample objects. Spectral types and rotational velocities are determined for all objects in the sample. The multi-epoch H-band spectra were examined for radial velocity variations in order to detect possible spectroscopic binaries. Eight of the nine objects have radial velocities that are consistent within the 1-sigma scatter of the sample. From their mean of -8.6 km/s these eight objects have a standard deviation of 2 km/s, which suggests that the sample stars are related. The ninth object shows significant radial velocity variations between epochs, characteristic of a spectroscopic binary. The overall multiplicity of the sample is high; we observed 13 stars in seven systems, identifying three new candidate binary components in this project. Many of the spectra reveal hydrogen emission lines typical of strong accretion processes, indicating that most of these objects harbor circumstellar disks and are less than a few million years old. We discuss possible interpretations of the enigmatic pure emission line spectrum of HBC 684. This work represents the highest spectral resolution infrared observations to date of these intriguing, nearby young stars.
description: 7 figures, accepted to Astrophysical Journal
Impact of the PSR J0740+6620 radius constraint on the properties of high-density matter
Creators: name: Legred, Isaac
name: Chatziioannou, Katerina
name: Essick, Reed
name: Han, Sophia
name: Landry, Philippe
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: X-ray pulse profile modeling of PSR J0740+6620, the most massive known pulsar, with data from the NICER and XMM-Newton observatories recently led to a measurement of its radius. We investigate this measurement's implications for the neutron star equation of state (EoS), employing a nonparametric EoS model based on Gaussian processes and combining information from other x-ray, radio and gravitational-wave observations of neutron stars. Our analysis mildly disfavors EoSs that support a disconnected hybrid star branch in the mass-radius relation, a proxy for strong phase transitions, with a Bayes factor of $6.9$. For such EoSs, the transition mass from the hadronic to the hybrid branch is constrained to lie outside ($1,2$) $M_{\odot}$. We also find that the conformal sound-speed bound is violated inside neutron star cores, which implies that the core matter is strongly interacting. The squared sound speed reaches a maximum of $0.75^{+0.25}_{-0.24}\, c^2$ at $3.60^{+2.25}_{-1.89}$ times nuclear saturation density at 90% credibility. Since all but the gravitational-wave observations prefer a relatively stiff EoS, PSR J0740+6620's central density is only $3.57^{+1.3}_{-1.3}$ times nuclear saturation, limiting the density range probed by observations of cold, nonrotating neutron stars in $β$-equilibrium.
description: 18 pages, 11 figures, data available at https://doi.org/10.5281/zenodo.5397808
Ανάλυση αιτιότητας σε γραφήματα σχέσεων από ιατρικά δεδομένα
Creators: name: Ασλάνογλου, Κωνσταντίνος Θεμιστοκλή
Publisher: name: Aristotle University of Thessaloniki
Year: 2017
Subjects: Κατευθυνόμενα ακυκλικά γραφήματα
Αιτιότητα
Ανακάλυψη δομής
Directed acyclic graphs
Causality
Structure discovery

description: Στην παρούσα διπλωματική εργασία μελετάμε το πρόβλημα της εκτίμησης ενός γραφικού μοντέλου που απεικονίζει σχέσεις αιτιότητας ανάμεσα σε μεταβλητές που αφορούν πραγματικά δεδομένα, με απώτερο σκοπό την εκτίμηση των ατιωδών επιπτώσεων μεταξύ των μεταβλητών αυτών. Aρχικά, αναζητούμε τις ρίζες των αιτιωδών γραφημάτων που είναι τα κατευθυνόμενα ακυκλικά γραφήματα, και αναλύουμε κάποιες έννοιες οι οποίες στηρίζονται πάνω σε αυτά, όπως η μαρκοβιανή ιδιότητα των κατευθυνόμενων γραφημάτων, η ανεξαρτησία υπό όρους και ο κατευθυνόμενος διαχωρισμός. Στη συνέχεια, δίνουμε έμφαση στον ορισμό της αιτιότητας, και με βάση αυτόν διατυπώνουμε τους τρόπους με τους οποίους μπορεί να γίνει η αναγνώριση και η εκτίμηση των επιτπώσεων των αιτιών, πάντα λαμβάνοντας υπόψην το αιτιώδες γράφημα. Στη συγκεκριμένη περίπτωση, που το γράφημα δε μας είναι γνωστό, αφού έχουμε να κάνουμε με πραγματικά δεδομένα, κρίνεται σκόπιμο να αναφερθούν μέθοδοι και στρατηγικές ανακάλυψης της αιτιώδους δομής ενός γραφήματος. Τέλος, έχουμε την εφαρμογή πάνω σε πραγματικά ιατρικά δεδομένα και την παρουσίαση των αποτελεσμάτων της ανάλυσής μας
description: In this diploma thesis we study the problem of estimating a graphical model that illustrates causal relationships between real-time variables, with the ultimate aim of estimating the causal effects between these variables. First of all, we are looking for the roots of causal graphs, which are the directed accyclic graphs, and we analyze some concepts that rely on them, such as the directed graph markov property, conditional independence, and directed separation. Then, we emphasize on the definition of causality, and on this basis we formulate the ways in which identification and estimation of the causal effects can be made, always taking into account the causal graph. In this specific case, where the graph is not known, since we are dealing with real data, it is appropriate to refer methods and strategies for discovering the causal structure of a graph. Finally, we have the application on real medical data and the presentation of the results of our analysis.
KMOS study of the mass accretion rate from Class I to Class II in NGC 1333
Creators: name: Fiorellino, Eleonora
name: Manara, Carlo
name: Nisini, Brunella
name: Ramsay, Suzanne
name: Antoniucci, Simone
name: Giannini, Teresa
name: Biazzo, Katia
name: Alcala', Juan
name: Fedele, Davide
Publisher: name: Zenodo
Year: 2021
Subjects: Accretion, accretion disks
Protoplanetary disks
Stars: low-mass
Stars: variables: T Tauri, Herbig Ae/Be
Stars: pre-main sequence
Stars: protostars

description: The mass accretion rate in the early stages (< 1Myr) of the star formation process is poorly studied. We aim to fill this gap by showing the results of the first homogeneous study of the accretion properties of a sample of Class I and II sources in the NGC 1333 cluster through near-IR spectroscopy.
Superconductivity in domains with corners
Creators: name: Bonnaillie-Noël, V.
name: Fournais, S.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Analysis of PDEs (math.AP)
subject: Spectral Theory (math.SP)
subject: FOS: Mathematics
subject: 35J10; 35J15; 35J60; 81Q10

description: We study the two-dimensional Ginzburg-Landau functional in a domain with corners for exterior magnetic field strengths near the critical field where the transition from the superconducting to the normal state occurs. We discuss and clarify the definition of this field and obtain a complete asymptotic expansion for it in the large $κ$ regime. Furthermore, we discuss nucleation of superconductivity at the boundary.
Comprehensive investigation of the symmetric space-star configuration in the nucleon-deuteron breakup
Creators: name: Witala, H.
name: Golak, J.
name: Skibinski, R.
name: Topolnicki, K.
name: Epelbaum, E.
name: Krebs, H.
name: Reinert, P.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We examine a description of available cross section data for symmetric space star (SST) configurations in the neutron-deuteron (nd) and proton-deuteron (pd) breakup reaction using numerically exact solutions of the three-nucleon (3N) Faddeev equation based on two- and three-nucleon (semi)phenomenological and chiral forces. The predicted SST cross sections are very stable with respect to the underlying dynamics for incoming nucleon laboratory energies below $\approx 25$ MeV. We discuss possible origins of the surprising discrepancies between theory and data found in low-energy nd and pd SST breakup measurements.
description: 30 pages, 12 figures
Channel plasmon-polaritons: modal shape, dispersion, and losses
Creators: name: Moreno, Esteban
name: Garcia-Vidal, F. J.
name: Rodrigo, Sergio G.
name: Martin-Moreno, L.
name: Bozhevolnyi, Sergey I.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We theoretically study channel plasmon-polaritons (CPPs) with a geometry similar to that in recent experiments at telecom wavelengths (Bozhevolnyi et al., Nature 440, 508 (2006)). The CPP modal shape, dispersion relation, and losses are simulated using the multiple multipole method and the finite difference time domain technique. It is shown that, with the increase of the wavelength, the fundamental CPP mode shifts progressively towards the groove opening, ceasing to be guided at the groove bottom and becoming hybridized with wedge plasmon-polaritons running along the groove edges.
description: 4 pages, 4 figures
Μελέτη πάνω στην ετερογενή φωτοκαταλυτική απολύμανση
Creators: name: Στεφανίδης, Συμεών Χρήστου
Publisher: name: Aristotle University of Thessaloniki
Year: 2017
Subjects: Φωτοκαταλυτική απολύμανση
Ηλιακή ενέργεια
Φωτοσυλλέκτες
Photocatalytic disinfection
Solar energy
Photovoltaics

description: Στην παρούσα εργασία μελετάται βιβλιογραφικά η ετερογενής φωτοκαταλυτική απολύμανση. Αρχικά, παρουσιάζονται η φυσικοχημεία των ημιαγωγών, οι κύριοι μηχανισμοί φωτοκαταλυτικής απολύμανσης, οι γενικοί μηχανισμοί που εξηγούν τη χημική δραστικότητα του οξυγόνου και του υδροξυλίου, καθώς επίσης η τεχνολογία των φωτοσυλλεκτών. Κατόπιν, αναλύεται το φαινόμενο Fenton (αντιδράσεις-μηχανισμός) που συναντάται στις διαδικασίες καθαρισμού του νερού, οι βιολογικές επιδράσεις και οι στοιχειώδεις παράμετροι που επηρεάζουν την απόδοση της φωτοκατάλυσης (ένταση ακτινοβολίας, θερμοκρασία, οξυγόνο, pH, οργανικό υπόστρωμα, κ.ά.), καθώς επίσης επιχειρείται η οικονομική εκτίμηση της φωτοκαταλυτικής απολύμανσης. Η παρούσα μελέτη επίσης εξετάζει το παράγωγο Quantum και τις αντιδράσεις Haber-Weiss του υπεροξειδίου του υδρογόνου, ενώ στο τέλος ανασκοπεί τρία σημαντικά επιστημονικά άρθρα με πρακτικά θέματα φωτοαπολύμανσης: i) Η ηλιακή ενέργεια ως πλεονέκτημα για την απολύμανση του νερού – Περιγραφή ηλιακού φωτοαντιδραστήρα, ii) Η αδρανοποίηση του Enterococcus Faecalis σε μια φωτο-επαγώμενη αντίδραση σε ένα αρχικά ουδέτερο pH με τη συμμετοχή παραβολικών συλλεκτών με 20 mg L-1 από Fe2+ και 50 mg L-1 από Η2Ο2 σε 3 διαφορετικά υλικά και iii) Η φωτοκαταλυτική ηλιακή απολύμανση του δονακίου της χολέρας χρησιμοποιώντας “Ag@ZnO core-shell structure nanocomposites”.
description: In the present work heterogeneous photocatalytic disinfection is literally studied. Initially, physicochemistry of semiconductors, the main mechanisms of photocatalytic decontamination, the general mechanisms explaining the chemical activity of oxygen and hydroxyl, as well as the technology of photoelectric devices are presented. Then, the Fenton phenomena encountered in water purification processes, biological effects and elementary parameters that affect photocatalysis performance (radiation intensity, temperature, oxygen, pH, organic substrate, etc.) are analyzed, as well as an economic evaluation of photocatalytic disinfection is done. The present study also examines the Quantum derivative and Haber-Weiss reactions of hydrogen peroxide, while in the end it reviews three important scientific papers on practical photolysis issues: i) Solar energy as an asset for water disinfection-Description of a solar photoreactor, ii) The inactivation of Enterococcus faecalis in a photo-induced reaction at an initially neutral pH with the participation of parabolic collectors with 20 mg L-1 of Fe2+ and 50 mg L-1 of H2O2 in 3 different materials; and iii) Photocatalytic solar disinfection of the of the cholera disease using "Ag-ZnO" core-shell structure nanocomposites.
Minimal pairs, reduplication, pronouns, relative clauses
Creators: name: Doko, Jeanne
name: Koutouan, Evelyne
name: Jarvis, Rebecca
name: Russell, Katherine
name: Kouadio, Timothée
name: Liu, Grace
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2023
Subjects: subject: ebr

description: Elicitation of habitual tone marking, verbal reduplication, verbs, multi-verb constructions, paradigms in negation, food terms and minimal pairs. Elicitation of extraposition, picture-NPs, and relative clauses.
Testing for Dark Matter in the Outskirts of Globular Clusters
Creators: name: Carlberg, Raymond G.
name: Grillmair, Carl J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: The proper motions of stars in the outskirts of globular clusters are used to estimate cluster velocity dispersion profiles as far as possible within their tidal radii. We use individual color-magnitude diagrams to select high probability cluster stars for 25 metal-poor globular clusters within 20 kpc of the sun, 19 of which have substantial numbers of stars at large radii. Of the 19, 11 clusters have a falling velocity dispersion in the 3-6 half mass radii range, 6 are flat, and 2 plausibly have a rising velocity dispersion. The profiles are all in the range expected from simulated clusters started at high redshift in a zoom-in cosmological simulation. The 11 clusters with falling velocity dispersion profiles are consistent with no dark matter above the Galactic background. The 6 clusters with approximately flat velocity dispersion profiles could have local dark matter, but are ambiguous. The 2 clusters with rising velocity dispersion profiles are consistent with a remnant local dark matter halo, but need membership confirmation and detailed orbital modeling to further test these preliminary results.
description: AAS revised version submitted
Δυναμική κρυπτογράφηση πακέτων σε δίκτυα πολλαπλών διαδρομών
Creators: name: Μόσχος, Αχιλλεύς Γεωργίου-Θεμιστοκλή
Publisher: name: Aristotle University of Thessaloniki
Year: 2017
Subjects: Κρυπτρογραφία
Μονοπάτια πολλαπλών διαδρομών
Αλγόριθμοι κρυπτογράφησης
Encryption
Multipath Networks
Encryption Algorithms

description: Αντικείμενο της παρούσας εργασίας είναι η μελέτη της δυναμικής κρυπτο- γράφησης των πακέτων σε ένα δίκτυο πολλαπλών μονοπατιών, και η επίδραση που αυτή έχει στην συνολική εικόνα του δικτύου. Συγκεκριμένα, μελετήθηκε ο αλγόριθμος κρυπτογράφησης Advanced Encryption System(AES) και οι διάφορες εκδοχές του, δηλαδή AES 128, 192 και 256 bit. Το μέγεθος των bits αναφέρεται στο συνολικό μέγεθος του κλειδιού. Ο βασικός σκοπός της εργασίας είναι να δείξει ότι με την χρήση δυναμικής κρυπτογράφησης στα μονοπάτια, αντί να εφαρμόζεται πάντα ο ίδιος αλγόριθμος, εξοικονομούμε αρκετό εύρος ζώνης, χωρίς να θυσιάζουμε την ασφάλεια των πακέτων. Η επαλήθευση της αρχικής μας σκέψης γίνεται μέσω των αποτελεσμάτων που προκύπτουν μέσω προσομοίωσης. Στο πρώτο κεφάλαιο, που αποτελεί την ει- σαγωγή, γίνεται μια σύντομη αναφορά στην ανάγκη της κρυπτογραφίας, και παρουσιάζεται η βασική δομή της εργασίας, καθώς και γιατί θεωρήσαμε ότι είναι σημαντική μια τέτοια μελέτη. Στο δεύτερο κεφάλαιο, παρουσιάζονται αναλυτικά όλες οι μεταβλητές της προσομοίωσης, καθώς και έχουμε μερικά mock data, τα οποία ουσιαστικά αποτελούν μια πρώτη επαλήθευση σε ένα πλασματικό δίκτυο(αναλυτικότερα όλα στο δεύτερο κεφάλαιο). Έπειτα, στο τρίτο κεφάλαιο, παρουσιάζονται τα αποτελέσματα στο δίκτυο μας, καθώς και γίνεται ανάλυση αυτών των αποτελεσμάτων. Τέλος, στο τέταρτο και τελευταίο κεφάλαιο, έχουμε μια σύνοψη όλων των αποτελεσμάτων, καθώς και μερικές προτροπές για περαιτέρω μελέτη πάνω στο θέμα
description: This work presents the study of the encryption upon a multipath network, and the impact it has on the throughput. By using dynamic encryption, instead of a applying the same algorithm on each packet, we save bandwidth and achieve better results. On this document, we try to back up our initial thesis by showing results that support our motion. This paper is divided into four chapters. Its main structure and the importance of this study, are described in the first chapter, which is the introduction. In the second chapter, we present the key assumptions as well the variables used in our simulation, and also we show some first mock results, that are a first indicator that our initial thesis is correct, given the appropriate environment. In the next chapter, we present the final results of our simulation, and then proceed to discuss them. Finally, in the fourth and last chapter of this document, we sum up all the results we obtained, and also we suggest some topics of future work revolving the issue of dynamic encryption.
Granular Brownian Motor
Creators: name: Cleuren, B.
name: Broeck, C. Van den
Publisher: name: arXiv
Year: 2006
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: An asymmetric object, undergoing dissipative collisions with surrounding particles, acquires a nonzero average velocity. The latter is calculated analytically by an expansion of the Boltzmann equation and the result is compared with Monte Carlo simulations.
description: 5 pages, 4 figures, submitted to EPL
rl_reach: Reproducible Reinforcement Learning Experiments for Robotic Reaching Tasks
Creators: name: Aumjaud, Pierre
name: McAuliffe, David
name: Lera, Francisco Javier Rodríguez
name: Cardiff, Philip
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: Artificial Intelligence (cs.AI)
subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: Training reinforcement learning agents at solving a given task is highly dependent on identifying optimal sets of hyperparameters and selecting suitable environment input / output configurations. This tedious process could be eased with a straightforward toolbox allowing its user to quickly compare different training parameter sets. We present rl_reach, a self-contained, open-source and easy-to-use software package designed to run reproducible reinforcement learning experiments for customisable robotic reaching tasks. rl_reach packs together training environments, agents, hyperparameter optimisation tools and policy evaluation scripts, allowing its users to quickly investigate and identify optimal training configurations. rl_reach is publicly available at this URL: https://github.com/PierreExeter/rl_reach.
description: 7 pages, 5 figures
Discolopeus thigmacaenus Stiller 2019, sp.n.
Creators: name: Stiller, Michael
Publisher: name: Zenodo
Year: 2019
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hemiptera
Cicadellidae
Discolopeus
Discolopeus thigmacaenus

description: Discolopeus thigmacaenus sp.n.
Holotype male in SANC. Paratypes in SANC.
description: Published as part of Stiller, Michael, 2019, Validation of Discolopeus Stiller, 2019 and corrections to figures, pp. 189-191 in Zootaxa 4585 (1) on page 189, DOI: 10.11646/zootaxa.4585.1.11, http://zenodo.org/record/2636169
Double-peaked inflation model: Scalar induced gravitational waves and primordial-black-hole suppression from primordial non-Gaussianity
Creators: name: Zhang, Fengge
name: Lin, Jiong
name: Lu, Yizhou
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: A significant abundance of primordial black hole (PBH) dark matter can be produced by curvature perturbations with power spectrum $Δ_ζ^2(k_{\mathrm{peak}})\sim \mathcal{O}(10^{-2})$ at small scales, associated with the generation of observable scalar induced gravitational waves (SIGWs). However, the primordial non-Gaussianity may play a non-negligible role, which is not usually considered. We propose two inflation models that predict double peaks of order $\mathcal{O}(10^{-2})$ in the power spectrum and study the effects of primordial non-Gaussianity on PBHs and SIGWs. This model is driven by a power-law potential, and has a noncanonical kinetic term whose coupling function admits two peaks. By field-redefinition, it can be recast into a canonical inflation model with two quasi-inflection points in the potential. We find that the PBH abundance will be altered saliently if non-Gaussianity parameter satisfies $|f_{\mathrm{NL}}(k_{\text{peak}},k_{\text{peak}},k_{\text{peak}})|\gtrsim Δ^2_ζ(k_{\mathrm{peak}})/(23δ^3_c) \sim \mathcal{O}(10^{-2})$. Whether the PBH abundance is suppressed or enhanced depends on the $f_{\mathrm{NL}}$ being positive or negative, respectively. In our model, non-Gaussianity parameter $f_{\mathrm{NL}}(k_{\mathrm{peak}},k_{\mathrm{peak}},k_{\mathrm{peak}})\sim \mathcal{O}(1)$ takes positive sign, thus PBH abundance is suppressed dramatically. On the contrary, SIGWs are insensitive to primordial non-Gaussianity and hardly affected, so they are still within the sensitivities of space-based GWs observatories and Square Kilometer Array.
description: 29 pages,7 figures
title: Arbeit, Religion, Ruf
title: Niederländisch-jüdische Dienstmädchen in Stellenanzeigen (1894 – 1925)
titleType: Subtitle
Creators: name: Seidel, Maria
Publisher: name: Universitätsverlag Potsdam
Year: 2021
Subjects: subject: 290 Andere Religionen

description: Die Arbeit als Dienstmädchen stellte im Europa des 19. Jahrhunderts die weitverbreitetste Erwerbs­tätigkeit von Frauen dar. Oft erwies sie sich als die einzige Möglichkeit, trotz mangelnder Schulbildung und fehlender beruflicher Qualifikationen einen Lebensunterhalt zu bestreiten. In der Regel bewarben sich junge Mädchen, die vor der Gründung eines eigenen Haushalts Geld verdienen wollten. Aber auch ältere Frauen, die unverheiratet blieben, waren teils ihr Leben lang auf den Beruf als Dienstbotin angewiesen. In den jüdischen Bürgerhaushalten der Niederlande, insbesondere in den zu dieser Zeit blühenden jüdischen Gemeinden in Amsterdam und anderen Großstädten, sah dies nicht anders aus. Auch dort putzten, kochten und stickten Dienstmädchen. Sie nahmen sich der Kindererziehung an und interagierten mit Kolleg­Innen und ArbeitgeberInnen. Vor allem wegen eines Mangels an schriftlichen Quellen ist bisher jedoch wenig über dieses Kapitel jüdischer und weiblicher Erwerbsgeschichte bekannt. Die vorliegende Studie wirft mit Hilfe von Stellenanzeigen für und von jüdischen Dienstmädchen Licht auf diese Berufsgruppe in den Jahren zwischen 1894 und 1925. Es wird ein Korpus von 540 Inseraten aus der vielgelesenen niederländischen Wochenzeitung Nieuw Israelietisch Weekblad diskursanalytisch untersucht, was neue Erkenntnisse über Leben und Arbeit der Dienstbotinnen zu Tage fördert. Die Anzeigen thematisieren sowohl das gesellschaftliche Ansehen der Frauen, ihre Aufgaben, Qualifikationen und finanziellen Ansprüche sowie ihre Religiosität. Durch einen Vergleich von Anzeigen aus drei Jahrzehnten kann die Studie aufzeigen, wie sich Einstellungen gegenüber dem Dienstmädchenberuf veränderten und sowohl Angestellte als auch ArbeitgeberInnen im Laufe der Zeit neue Maßstäbe an die häusliche Arbeit anlegten.
description: Pri ha-Pardes; 14
Analogue gravity in laser-driven plasma
Creators: name: Fiedler, Cezary
Publisher: name: Lancaster University
Year: 2021

description: This thesis investigates whether laser-driven plasma can be used as an analogue model of gravity in order to investigate Hawking radiation. An action describing laser-driven plasma is derived, and effective metrics are obtained in various regimes from the resulting field equations. Effective metrics exhibiting different behaviour are analysed by considering different forms of the fields. One of the effective metrics has the required properties for the analysis of Hawking radiation. It is shown that for a near-IR laser the Hawking temperature is about 4.5 K, which is small compared to typical plasma temperatures. However the waist of the laser is shown to have significant impact on the resulting Hawking temperature. As such it may be possible to obtain Hawking temperatures of several hundred Kelvin with a pulse width of a few $\mu$m. A new approach to investigating quantum fluctuations in an underdense laser-driven plasma is also presented that naturally emerges from the model underpinning the above studies. It is shown that the 1-loop effective action is expressible in terms of a massless field theory on a dilatonic curved background. Plane wave perturbations to the field equations are analysed for fields which are linear in Minkowski coordinates, and two dispersion relations are obtained. The impact on a Gaussian wave packet is calculated, suggesting it may be possible to experimentally verify this theory by utilising an x-ray laser.
Weyl Groups with Coxeter Presentation and Presentation by Conjugation
Creators: name: Hofmann, Georg
Publisher: name: arXiv
Year: 2006
Subjects: subject: Group Theory (math.GR)
subject: FOS: Mathematics

description: We investigate which Weyl groups have a Coxeter presentation and which of them at least have the presentation by conjugation with respect to their root system. For most concepts of root systems the Weyl group has both. In the context of extended affine root systems (EARS) there is a small subclass allowing a Coxeter presentation of the Weyl group and a larger subclass allowing the presentation by conjugation. We give necessary and sufficient conditions for both classes. Our results entail that every extended affine Weyl group (EAWeG) has the presentation by conjugation with respect to a suitable EARS.
description: 23 pages
Institutional Delivery Service Utilization and Associated Factors among Women of Child Bearing Age at Boset Woreda, Oromia Regional State, Central Ethiopia
Creators: name: Taye Shigute, Solomon Tejineh
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2017

description: Background: Evidence has shown access to skilled attendance at birth averting nearly 16-33% maternal deaths. Despite concerted effort to increase access and importance of institutional delivery in preventing maternal death, only 46% and 15% of developing nations and Ethiopian national deliveries, respectively delivered in health facilities that makes assessment of the barriers to health facility delivery important in the study setup. Objective: To assess institutional delivery magnitude and associated factors among mothers delivered in the past 12 months in Boset Woreda, Ethiopia. Methods: A community based cross-sectional study was employed. Systematic random sampling was used to select participants. Data collected using Interviewer administered questionnaire and entered Epi Info 7.1 and analyzed using SPSS version 20.0, p-value 0.05 used to declare statistical significance. Results: A total of 589 women were participated in this study. The mean age of the respondents was 26 years (+5 SD). Educational status of 321 (54.0%) were read and write, while 198 (34.0%) were illiterate. The magnitude of institutional delivery utilization is found 60%. From the study, primary and above educational status (AOR: 2.1; (95%CI: 10.1, 4.70), occupation other than house wife (merchant, employee, etc.) (AOR:1.9; 95%CI:1.12,4.01), age ≥ 18 years during their first marriage (AOR: 1.5; 95%CI:1.21,2.30), age ≥ 18 years during their first pregnancy (AOR: 1.8; 95%CI:1.13,3.35), primigravida (AOR: 2.5; 95%CI: 1.57,3.99), distance from health facility <1 hour (AOR: 15; 95%CI: 9.34,27.11), and women decision maker for place of delivery (AOR: 3.4; 95%CI: 1.86,6.27) were statistically significant predictors contributing for better institutional delivery utilization. Conclusion and Recommendation: Institutional delivery service utilization was found to be higher compared to other areas. Finding revealed education, occupation, age at marriage and distance from facility independently affect institutional delivery. Efforts should be made to increase maternal education access to facility to improve institutional delivery utilization
Mechanism emulation with a magnetically levitated input/output device
Creators: name: Vlaar, Tim
Publisher: name: University of British Columbia
Year: 2009

description: The emulation of stiff walls and stick-slip friction has been developed. A high performance, six degree-of-freedom , fine motion, magnetically levitated input/output device was used in the implementation. For the stiff wall emulation, two control algorithms were developed from the commonly used mass-spring-damper model: an observer-based design, and a braking pulse design. The mass-spring-damper model is limited in its achievable stiffness due to instability. Both control methods increased perceived stiffness substantially (stably) for one degree-offreedom. The braking pulse method for stiff wall emulation was extended to a six degree-of-freedom case in which a small cube is constrained within a larger cube. The contact forces and torques between the mobile inner cube and outer constraining cube are felt by the operator. A further extension was to a larger workspace which was developed by mounting the fine motion device on the end-effector of a coarse motion, six degree-of-freedom, elbow manipulator with a spherical wrist. The manipulator was controlled in rate mode by the fine motion device. Experiments have been designed to test the position at which a subject feels the stiff wall, and the completion time for a subject to move from an unconstrained environment to the stiff wall. For stick-slip friction, a modified Karnopp model was implemented using a Position Derivative (PD) controller within the stick friction threshold. Even though the PD controller allows some motion during the stick phase, the haptic feedback provided is remarkably similar to stick-slip friction.
Molecular Characterization of Free Radical Function in Redox Signaling and Strategies to Reduce Oxidative Stress in Cardiovascular Diseases
Creators: name: Melaku, Leta Shiferaw
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2018

description: Free radicals are molecules with an unpaired electron. Due to the presence of free electron, these molecules are highly reactive. At moderate concentrations, free radicals play an important role as regulatory mediators in signaling molecules in a number of normal biochemical and physiological processes. Although there are several sources of vascular reactive oxygen species (ROS), the enzyme nicotinamide adenine dinucleotide phosphate oxidase is emerging as a strong candidate for excessive ROS production that is thought to lead to vascular oxidative stress. The implication of oxidative stress in the etiology of several cardiovascular diseases suggests that strategically, nonpharmacological and pharmacological therapy represents a promising avenue for treatment.
Star Models with Dark Energy
Creators: name: Chan, R.
name: da Silva, M. F. A.
name: da Rocha, J. F. Villas
Publisher: name: arXiv
Year: 2008
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We have constructed star models consisting of four parts: (i) a homogeneous inner core with anisotropic pressure (ii) an infinitesimal thin shell separating the core and the envelope; (iii) an envelope of inhomogeneous density and isotropic pressure; (iv) an infinitesimal thin shell matching the envelope boundary and the exterior Schwarzschild spacetime. We have analyzed all the energy conditions for the core, envelope and the two thin shells. We have found that, in order to have static solutions, at least one of the regions must be constituted by dark energy. The results show that there is no physical reason to have a superior limit for the mass of these objects but for the ratio of mass and radius.
description: 20 pages, 1 figure, references and some comments added, typos corrected, in press GRG
Entanglement in One-Dimensional Spin Systems
Creators: name: Osterloh, A.
name: Amico, L.
name: Plastina, F.
name: Fazio, R.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: For the anisotropic XY model in transverse magnetic field, we analyze the ground state and its concurrence-free point for generic anisotropy, and the time evolution of initial Bell states created in a fully polarized background and on the ground state. We find that the pairwise entanglement propagates with a velocity proportional to the reduced interaction for all the four Bell states. A transmutation from singlet-like to triplet-like states is observed during the propagation. Characteristic for the anisotropic models is the instantaneous creation of pairwise entanglement from a fully polarized state; furthermore, the propagation of pairwise entanglement is suppressed in favor of a creation of different types of entanglement. The ``entanglement wave'' evolving from a Bell state on the ground state turns out to be very localized in space-time. Our findings agree with a recently formulated conjecture on entanglement sharing; some results are interpreted in terms of this conjecture.
description: 14 pages, 32 figures, revtex4
Molecular Mechanism of Vasoprotective Effects of Vitamin D
Creators: name: Melaku, Leta
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2018

description: Vitamin D is a prohormone which is converted into its active hormonal form 1,25‑dihydroxyvitamin D3 (1,25(OH) 2 D 3 ) in order to activate targeted genes to engender its biological actions. Through both 1,25(OH) 2 D 3 ‑dependent and 1,25(OH) 2 D 3 ‑independent Vitamin D receptor, it actions may involve more than one single receptor and ligand. Vitamin D plays important, pleiotropic role primarily in the maintenance of calcium and phosphate homeostasis by influencing the balance between bone resorption and formation. However, its influence goes far beyond the regulation of mineral homeostasis as diverse activities of Vitamin D assure through both genomic and nongenomic pathways, and it has a physiological value upon vascular health. It has been shown to protect against endothelial dysfunction, vascular smooth muscle cell proliferation and migration, and modulation of the immune system as well as the inflammatory response. In addition, vitamin D has been shown to have systemic effects on insulin resistance, dyslipidemia, and hypertension. Although some vitamin D is essential for cardiovascular health, excess may have detrimental effects, particularly on elastogenesis and inflammation of the arterial wall. This review explores the physiological role of vitamin D in vascular health protection.
Bahadur representation of sample quantiles for functional of Gaussian dependent sequences under a minimal assumption
Creators: name: Coeurjolly, Jean-François
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistics Theory (math.ST)
subject: FOS: Mathematics

description: We obtain a Bahadur representation for sample quantiles of nonlinear functional of Gaussian sequences with correlation function decreasing as $k^{-α}$ for some $α> 0$. This representation is derived under a mimimal assumption.