cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Ηλεκτροκαταλυτική Σύνθεση Αμμωνίας από Άζωτο και Υδρατμό σε Ατμοσφαιρική Πίεση:
Creators: name: Κυριάκου, Βασίλειος Αντωνίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: Ηλεκτροκατάλυση
Σύνθεση Αμμωνίας
Πρωτονιακοί Αγωγοί
Electrocatalysis
Ammonia Synthesis
Proton Conductors

description: Στη παρούσα διπλωματική εργασία εξετάστηκε η ηλεκτροκαταλυτική σύνθεση της ΝΗ3 από Ν2 και Η2Ο υπό ατμοσφαιρική πίεση και σε Τ = 450-750 oC σε κυψέλη στερεού ηλεκτρολύτη. Για να μπορέσουν να συγκριθούν τα αποτελέσματα μελετήθηκε και η καταλυτική σύνθεση ΝΗ3 από τα στοιχεία της σε ατμοσφαιρική πίεση. Στα πειράματα χρησιμοποιήθηκε πρωτονιακός αγωγός περοβσκιτικού οξειδίου SrZr0.95Y0.05O3 (SΖY). Τα καταλυτικά αποτελέσματα έδειξαν ότι οι βέλτιστες συνθήκες σύνθεσης αμμωνίας με καταλύτη σκόνη Ru ήταν: Τ = 450oC, ΡΗ2/ΡΝ2 = 3, καθώς και ότι η αντίδραση σύνθεσης αμμωνίας ήταν πρώτης τάξης ως προς το N2 και 0.8 - 1.3 ως προς το Η2. Στα ηλεκτροκαταλυτικά πειράματα, ο βιομηχανικός καταλύτης Ru αναμείχθηκε με Pt για να μπορέσει να χρησιμοποιηθεί ως το ηλεκτρόδιο εργασίας (κάθοδος) της κυψέλης ενώ μεταλλικό φιλμ Pt ήταν το ηλεκτρόδιο μέτρησης (άνοδος). Το Η2Ο ηλεκτρολυόταν στην άνοδο σχηματίζοντας Ο2 και Η+ με τα τελευταία να μεταφέρονται στην κάθοδο μέσω του ηλεκτρολύτη, όπου και αντιδρούσαν με το Ν2 προς παραγωγή ΝΗ3. Οι μετατροπή του Ν2 ήταν πολύ χαμηλή κάτω του 1%, πιθανότατα λόγω της χαμηλής αγωγιμότητας του ηλεκτροδίου εργασίας. Από την άλλη πλευρά η συγκεκριμένη διεργασία σε μία τέτοια κυψέλη φαίνεται να έχει πολλά υποσχόμενα χαρακτηριστικά που κάνουν αυτόν τον εναλλακτικό τρόπο σύνθεσης αμμωνίας να αξίζει να μελετηθεί εκτενέστερα στο μέλλον.
description: In the present thesis the electrochemical synthesis of NH3 from N2 and H2O in atmospheric pressure and at T = 450-750 oC in solid electrolyte cell, was examined. In order to compare the results the catalytic synthesis of NH3 from its components at atmospheric pressure was studied. In the experiments a proton conductor perovskite oxide of SrZr0.95Y0.05O3 type (SZY) was used. The catalytic results showed that the optimal conditions for ammonia synthesis with Ru catalyst in powder form were: T = 450oC, PH2/PN2 = 3 and that the ammonia synthesis reaction was of first order in N2 and 0.8 - 1.3 in H2. In electrocatalytic experiments, the industrial Ru catalyst was mixed Pt in order to be used as the working electrode (cathode), while the counter electrode of the cell was metallic Pt (anode). The H2O was electrolyzed to the anode to form O2 and H+ with the latter been transported through the electrolyte to the cathode, where it reacted with N2 to produce NH3 production. Conversion of N2 was lower than 1%, probably due to the low conductivity of the working electrode. On the other hand, this process in such a cell appears to have promising characteristics that make this alternative way of ammonia synthesis to be worth of further research in the future.
MPEC 2025-G77 : 2021 VR27
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2025
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Η ιστορία και η δράση του Σχολείου Νέας Ελληνικής Γλώσσας του Αριστοτελείου Πανεπιστημίου Θεσσαλονίκης (1977-2009):
Creators: name: Ψαρρά, Μαρία Ευστράτιου
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: Σχολείο Νέας Ελληνικής Γλώσσας
Τριτοβάθμια εκπαίδευση
Ευρώπη
School of Modern Language and Culture
Third degree education
Europe

description: Σκοπός της παρούσας εργασίας ήταν να φωτίσει το έργο του ΣΝΕΓ και να διαπιστώσει ιστορικά την ζήτηση για την εκμάθηση της ελληνικής γλώσσας σε σχέση με τη θέση και τις σχέσεις της χώρας διεθνώς. Γι’ αυτό η εργασία έχει στόχο να καταγράψει συστηματικά και να παρουσιάσει την ίδρυση και την λειτουργία του Σχολείου ως σήμερα, τα ποσοστά εκμάθησης της ελληνικής γλώσσας πριν και μετά την είσοδο της χώρας στην ΕΕ, το πρόγραμμα και τις δραστηριότητες που προσφέρει το Σχολείο αναφορικά με την εκμάθηση της ελληνικής γλώσσας και την προώθηση του ελληνικού πολιτισμού σε μια πολυπολιτισμική κοινωνία σύμφωνα με τα κείμενα της ΕΕ. Αναφέρονται ιστορικά στοιχεία και δικαιολογούνται ιστορικά οι λόγοι εκμάθησης της ελληνικής γλώσσας, η επαγγελματική ιδιότητα των σπουδαστών, οι εξετάσεις επάρκειας στην ελληνομάθεια που διεξάγει το Σχολείο, οι δραστηριότητες και τα προγράμματα διδασκαλίας που οργανώνονται ανάλογα με τις ανάγκες των σπουδαστών, το επίπεδο ελληνομάθειας, τη διάρκεια σπουδών τους.
description: The aim of the present thesis was to enlighten the action of School of Modern Language and to ascertain historically the enquiry of Greek language and culture according to international relationships between Greece and other countries. This is why the aim is to present systematically the foundation and working of School until now, the learning percentage of Greek language before and after the country’s admission in the EU and the courses and activities offered relating to Greek language and culture in a multicultural society. Also are reported elements which excuse the reasons why learning Greek language, the students’ profession, the certificate of attainment in Greek, the cultural functions and teaching courses organized according to the students’ needs, levels of certificate and the duration of studies.
Proof of vanishing cohomology at the tachyon vacuum
Creators: name: Ellwood, Ian
name: Schnabl, Martin
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We prove Sen's third conjecture that there are no on-shell perturbative excitations of the tachyon vacuum in open bosonic string field theory. The proof relies on the existence of a special state A, which, when acted on by the BRST operator at the tachyon vacuum, gives the identity. While this state was found numerically in Feynman-Siegel gauge, here we give a simple analytic expression.
description: 19 pages, 4 figures; v2: references added
Recent advances in ionic thermoelectric systems and theoretical modelling
Creators: name: Jabeen, Nazish
name: Muddasar, Muhammad
name: Menéndez, Nicolas
name: Ali Nasiri, Mohammad
name: M. Goméz, Clara
name: Collins, Maurice
name: Muñoz-Espí, Rafael
name: Cantarero, Andres
name: Culebras, Mario
Publisher: name: University of Limerick
Year: 2024
Subjects: classificationCode: 40
subject: Engineering

description: Converting waste heat from solar radiation and industrial processes into useable electricity remains a challenge due to limitations of traditional thermoelectrics. Ionic thermoelectric (i-TE) materials offer a compelling alternative to traditional thermoelectrics due to their excellent ionic thermopower, low thermal conductivity, and abundant material options. This review categorizes i-TE materials into thermally diffusive and thermogalvanic types, with an emphasis on the former due to its superior thermopower. This review also highlights the i-TE materials for creating ionic thermoelectric supercapacitors (ITESCs) that can generate significantly higher voltages from low-grade heat sources compared to conventional technologies. Additionally, it explores thermogalvanic cells and combined devices, discussing key optimization parameters and theoretical modeling approaches for maximizing material and device performance. Future directions aim to enhance i-TE material performance and address low energy density challenges for flexible and wearable applications. Herein, the cutting-edge of i-TE materials are comprehensively outlined, empowering researchers to develop next-generation waste heat harvesting technologies for a more sustainable future.
On the Kármán momentum-integral approach and the Pohlhausen paradox
Creators: name: Majdalani, Joseph
name: Xuan, Li-Jun
Publisher: name: arXiv
Year: 2020
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: This work explores simple relations that follow from the momentum-integral equation absent a pressure gradient. The resulting expressions enable us to relate the boundary-layer characteristics of a velocity profile, $u(y)$, to an assumed flow function and its wall derivative relative to the wall-normal coordinate, $y$. Consequently, disturbance, displacement, and momentum thicknesses, as well as skin friction and drag coefficients, which are typically evaluated and tabulated in classical monographs, can be readily determined for a given profile, $F(ξ)=u/U$. Here $ξ=y/δ$ denotes the boundary-layer coordinate. These expressions are then employed to provide a rational explanation for the 1921 Pohlhausen polynomial paradox, namely, the reason why a quartic representation of the velocity leads to less accurate predictions of the disturbance, displacement, and momentum thicknesses than using cubic or quadratic polynomials. Not only do we identify the factors underlying this behaviour, we proceed to outline a procedure to overcome its manifestation at any order. This enables us to derive optimal piecewise approximations that do not suffer from the particular limitations affecting Pohlhausen's $F(ξ)=2ξ-2ξ^3 +ξ^4$. For example, our alternative profile, $F(ξ)=(5ξ-3ξ^3+ξ^4)/3$, leads to an order-of-magnitude improvement in precision when incorporated into the Kármán-Pohlhausen approach in both viscous and thermal analyses. Then noting the significance of the Blasius constant, $\bar{s} \approx 1.630398$, this approach is extended to construct a set of uniformly valid solutions, including $F(ξ)=1-\exp[-\bar{s}ξ(1+\bar{s}ξ/2+ξ^2)]$, which continues to hold beyond the boundary-layer edge as $y\rightarrow\infty$. Given its substantially reduced error, the latter is shown, through comparisons to other models, to be practically equivalent to the Blasius solution.
description: 32 pages, 5 figures, and 5 tables
The initial-boundary value problem for the 1D nonlinear Schroedinger equation on the half-line
Creators: name: Holmer, Justin
Publisher: name: arXiv
Year: 2006
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 35Q55

description: We prove, by adapting the method of Colliander-Kenig (2002), local well-posedness of the initial-boundary value problem for the one-dimensional nonlinear Schroedinger equation on the half-line under low boundary regularity assumptions.
description: 21 pages, no figures
MOBSTER -- V: Discovery of a magnetic companion star to the magnetic $β$ Cep pulsator HD 156424
Creators: name: Shultz, M. E.
name: Rivinius, Th.
name: Wade, G. A.
name: Kochukhov, O.
name: Alecian, E.
name: David-Uraz, A.
name: Sikora, J.
name: Collaboration, the MiMeS
Publisher: name: arXiv
Year: 2020
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: HD 156424 (B2 V) is a little-studied magnetic hot star in the Sco OB4 association, previously noted to display both high-frequency radial velocity (RV) variability and magnetospheric H$α$ emission. We have analysed the TESS light curve, and find that it is a $β$ Cep pulsator with 11 detectable frequencies, 4 of which are independent $p$-modes. The strongest frequency is also detectable in RVs from ground-based high-resolution spectroscopy. RVs also show a long-term variation, suggestive of orbital motion with a period of $\sim$years; significant differences in the frequencies determined from TESS and RV datasets are consistent with a light-time effect from orbital motion. Close examination of the star's spectrum reveals the presence of a spectroscopic companion, however as its RV is not variable it cannot be responsible for the orbital motion and we therefore infer that the system is a hierarchical triple with a so-far undetected third star. Reanalysis of LSD profiles from ESPaDOnS and HARPSpol spectropolarimetry reveals the surprising presence of a strong magnetic field in the companion star, with $\langle B_z \rangle$ about $+1.5$ kG as compared to $\langle B_z \rangle \sim -0.8$ kG for the primary. HD 156424 is thus the second hot binary with two magnetic stars. We are unable to identify a rotational period for HD 156424A. The magnetospheric H$α$ emission appears to originate around HD 156424B. Using H$α$, as well as other variable spectral lines, we determine a period of about 0.52 d, making HD 156424B one of the most rapidly rotating magnetic hot stars.
description: 16 pages, 13 figures, 4 tables, accepted for publication in MNRAS
Μελαγχολία στην άκρη της πόλης: η μελαγχολία στα μυθιστορήματα της Σώτης Τριανταφύλλου
Creators: name: Δρουγαλάς, Κωνσταντίνος Νικολάου
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: Σώτη Τριανταφύλλου
μελαγχολία
Αμερικανική λογοτεχνία
Soti Triantafyllou
melancholy
American literature

description: Αντικείμενο της συγκεκριμένης μεταπτυχιακής εργασίας είναι η αποσαφήνιση του όρου «μελαγχολία» μέσα από τη συνεξέταση τεσσάρων μυθιστορημάτων της Σώτης Τριανταφύλλου και πέντε πεζογραφικών κειμένων της αμερικανικής λογοτεχνίας. Αρχικά παρουσιάζω μία ιστορία της μελαγχολίας από την αρχαιότητα και τον Μεσαίωνα μέχρι τις μέρες μας. Στη συνέχεια περιγράφονται τα κοινά σημεία και οι αποκλίσεις ανάμεσα στο φαινόμενο της μελαγχολίας και σε αυτό της κατάθλιψης. Μέσα από τη μεταπτυχιακή εργασία στοχεύω στην ανάλυση εφτά μορφών μελαγχολίας (εικαστική, ερωτική, θρησκευτική, κληρονομική, αριστερή, κατάθλιψη και μελαγχολία στην πόλη) στα λογοτεχνικά έργα που προηγήθηκαν. Μέσα από αυτά διαπιστώνουμε πως η μελαγχολία είναι ένας βασικός άξονας τόσο στα μυθιστορήματα της Σώτης Τριανταφύλλου όσο και στα κείμενα των Αμερικανών πεζογράφων: προωθεί την πλοκή, τα γεγονότα και τους χαρακτήρες, ενώ προσφέρει τα κίνητρα και τα χαρακτηριστικά των πρωταγωνιστών. Η μελαγχολία δεν αποτελεί απλώς μία λογοτεχνική κατασκευή που διάγει βίο παράλληλο με τον μυθιστορηματικό, αλλά αναπόδραστη ουσία μερικών από τους σημαντικότερους μυθιστορηματικούς χαρακτήρες του 20ού αιώνα.
description: The present postgraduate thesis aims at the clarification of the term “melancholy” through the parallel examination of four novels of Soti Triantafyllou and five American prose pieces of interwar and postwar literature. Firstly the history of melancholy from the ancient and medieval until nowadays is presented. Then the similarities and the inclinations between the phenomenon of melancholy and that of depression are described. Through my postgraduate thesis I aim at the analysis of seven forms of melancholy (pictorial, erotic, religious, hereditary, left-wing, depression and melancholy in the city) in the literal texts that are presented before. Through these texts is understandable that melancholy is the keystone both in the novels of Soti Triantafyllou and the texts of the American prose writers: melancholy promotes the plot, the facts and the characters while it reinforces the motifs and the characteristics of the main characters. Melancholy does not only form a part of a literal construction that fares a parallel life with the fictional one, but an integral part of some of the most important fictional characters of the 20th century.
Interacting Thermofield Doubles and Critical Behavior in Random Regular Graphs
Creators: name: Gorsky, Alexander
name: Valba, Olga
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: We discuss numerically the non-perturbative effects in exponential random graphs which are analogue of eigenvalue instantons in matrix models. The phase structure of exponential random graphs with chemical potential for 4-cycles and degree preserving constraint is clarified. The first order phase transition at critical value of chemical potential for 4-cycles into bipartite phase with a formation of fixed number of bipartite clusters is found for ensemble of random regular graphs (RRG). We consider the similar phase transition in combinatorial quantum gravity based of the Ollivier graph curvature for RRG supplemented with hard-core constraint and show that a order of a phase transition and the structure of emerging phase depend on a vertex degree d in RRG. For d = 3 the bipartite closed ribbon emerges at bipartite phase while for d > 3 the ensemble of isolated or weakly interacting hypercubes supplemented with the bipartite closed ribbon gets emerged at the first order phase transition with a clear-cut hysteresis. If the additional connectedness condition is imposed the bipartite phase gets identified as the closed chain of weakly coupled hypercubes. Since the ground state of isolated hypercube is the thermofield double (TFD) we suggest that the dual holographic picture involves multiboundary wormholes. Treating RRG as a model of a Hilbert space for a interacting many-body system we discuss the patterns of the Hilbert space fragmentation at the phase transition. We also briefly comment on a possible relation of the found phase transition to the problem of holographic interpretation of a partial deconfinement transition in the gauge theories.
description: 22 pages, 7 figures
Semiclassical (QFT) and Quantum (String) anti - de Sitter Regimes: New Results
Creators: name: Bouchareb, A.
name: Medrano, M. Ramon
name: Sanchez, N. G.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We compute the quantum string entropy S_s(m, H) from the microscopic string density of states of mass m in Anti de Sitter space-time. For high m, (high Hm -->c/α'), no phase transition occurs at the Anti de Sitter string temperature T_{s} which is higher than the flat space (Hagedorn) temperature t_{s}. (the Hubble constant H acts as producing a smaller string constant and thus, a higher tension). T_s is the precise quantum dual of the semiclassical (QFT) Anti de Sitter temperature scale . We compute the quantum string emission by a black hole in Anti de Sitter space-time (bhAdS). In the early evaporation stage, it shows the QFT Hawking emission with temperature T_{sem~bhAdS}, (semiclassical regime). For T_{sem~bhAdS}--> T_{s}, it exhibits a phase transition into a Anti de Sitter string state. New string bounds on the black hole emerge in the bhAdS string regime. We find a new formula for the full (quantum regime included) Anti de Sitter entropy S_{sem}, as a function of the usual Bekenstein-Hawking entropy S_{sem}^(0). For low H (semiclassical regime), S_{sem}^(0) is the leading term but for high H (quantum regime), no phase transition operates, in contrast to de Sitter space, and the entropy S_{sem} is very different from the Bekenstein-Hawking term S_{sem}^(0).
description: Comments 26 pages; no figures
Far-off-resonant wave interaction in one-dimensional photonic crystals with quadratic nonlinearity
Creators: name: Hagmann, Johannes-Geert
name: Tkeshelashvili, Lasha
name: Busch, Kurt
name: Schneider, Guido
Publisher: name: arXiv
Year: 2008
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We extend a recently developed Hamiltonian formalism for nonlinear wave interaction processes in spatially periodic dielectric structures to the far-off-resonant regime, and investigate numerically the three-wave resonance conditions in a one-dimensional optical medium with $χ^{(2)}$ nonlinearity. In particular, we demonstrate that the cascading of nonresonant wave interaction processes generates an effective $χ^{(3)}$ nonlinear response in these systems. We obtain the corresponding coupling coefficients through appropriate normal form transformations that formally lead to the Zakharov equation for spatially periodic optical media.
description: 14 pages, 4 figures
Don Tonino Bello vescovo frontaliero, artigiano della «pace di Cristo» nel mar Mediterraneo
Creators: name: Farinola, Onofrio
Publisher: name: Apulia Theologica
Year: 2025

description: Apulia Theologica, V. 6 N. 1 (2020): Apulia theologica vol. 6, fascicolo 1
Μνήμη επεισοδίων και η δημιουργία νορμών στον ελληνικό πληθυσμό για τη συστοιχία «Πόρτες και Άνθρωποι»: μια δοκιμασία οπτικής και λεκτικής ανάκλησης και αναγνώρισης
Creators: name: Αραμπατζή, Ξανθή Δημητρίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: Νευροψυχολογική συστοιχία
Μνήμη επεισοδίων
Νευροψυχολογική εκτίμηση
Neuropsychological battery
Episodic memory
Neuropsychological assessment

description: Η παρούσα εργασία αποτελεί μια προσπάθεια παρουσίασης της συστοιχίας «Πόρτες και Άνθρωποι», και της δημιουργίας νορμών στον ελληνικό πληθυσμό. Παρουσιάζεται το θεωρητικό πλαίσιο μέσα στο οποίο δημιουργήθηκε η συστοιχία, σε σχέση με τη λειτουργία την οποία αξιολογεί και την προσέγγιση την οποία ακολουθεί. Η συστοιχία δημιουργήθηκε για να εξετάζει τη μνήμη επεισοδίων με έμφαση στην οικολογική εγκυρότητα. Οι δοκιμασίες που απαρτίζουν αυτό το εργαλείο, μελετούν τη λεκτική και την οπτική ανάκληση και αναγνώριση, με έργα από την καθημερινή ζωή των ανθρώπων. Η συστοιχία χορηγήθηκε συνολικά σε 160 άτομα. Οι στατιστικές αναλύσεις έδειξαν ότι ο παράγοντας φύλο δεν είχε επίδραση στην επίδοση, ενώ η ηλικία και το μορφωτικό επίπεδο είχαν επίδραση στην επίδοση σε όλες τις υποδοκιμασίες. Συγκεκριμένα, η ηλικία συσχετίστηκε αρνητικά με την επίδοση των ατόμων, ενώ το μορφωτικό επίπεδο συσχετίστηκε θετικά. Παράλληλα, συζητούνται τα αποτελέσματα και η χρησιμότητα της συστοιχίας, και παρατίθενται συνοπτικοί πίνακες με τα κανονιστικά δεδομένα για χρήση της συστοιχίας στον ελληνικό πληθυσμό.
description: In the current study, we present the battery Doors and People and the development of its norms for the Greek population. We discuss the theoretical framework in which the battery was developed, related to the function that the battery assess and the approach that it represents. The battery was developed to assess episodic memory emphasizing especially the value of ecological validity. The tests, that compose this battery, study the verbal and the visual recall and recognition with tasks that are familiar to our daily life. The battery was administered to 160 adults. Statistical analysis revealed that sex had no effect on performance. However, performance was influenced by age and educational level in every subtest. Age was correlated negatively with performance, while education was correlated positively. We discuss these results, as well as the usefulness of the battery. Furthermore, tables of normative data for the Greek population are included.
Thermal and chemical evolution of the primordial clouds in warm dark matter models with keV sterile neutrinos in one-zone approximation
Creators: name: Stasielak, Jaroslaw
name: Biermann, Peter L.
name: Kusenko, Alexander
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We follow the evolution of the baryonic top-hat overdensity in a single-zone approximation. Our goal is to juxtapose the evolution of the gas temperature in the primordial clouds in the lambda cold dark matter model and the warm dark matter model with keV sterile neutrinos and to check the effects of their decays, into one X-ray photon and one active neutrino, on the structure formation. We find that, in all the cases we have examined, the overall effect of sterile dark matter is to facilitate the cooling of gas and to reduce the minimal mass of the halo able to collapse. Hence, we conclude that X-rays from the decays of dark matter in the form of sterile neutrinos can help the early collapse of gas clouds and the subsequent star formation.
description: 3 pages, 1 figure, talk presented at the Parallel Session on sterile neutrinos and dark matter at the 11th Marcel Grossmann Meeting held in Berlin, Germany, July 2006, to appear in the proceedings of MG11
Ex-stasis and Acting Methods
Creators: name: Camuti, Fabiola
Publisher: name: SigMa - Rivista di Letterature comparate, Teatro e Arti dello spettacolo
Year: 2023

description: This paper addresses the in-depth study and interest of Sergei Mikhailovich Eisenstein in Ignacio de Loyola’s Spiritual Exercises, related to the Jesuit practice. It demonstrates that Eisenstein not only calls upon Loyola’s teaching in his theorization of pathos and ecstasy, but that he especially does so also to draw upon specific characteristics of well-known and established Western theatre acting methods. This second reference is mostly unknown to the Anglo-Saxon speaking academic field because of the lack of English translations of the specific essay in which Eisenstein constructs his parallelism between the Jesuit exercises and the work of the Stanislavskian actor. In fact, in the official English edition of Eisenstein’s writings this specific passage, which is present in the Italian publication, was left out because of editorial choices. The paper aims at underlining the importance of Eisenstein’s interests in the Jesuit spiritual traditions in outlining the idea of the practice of acting as an attraction in his theorisation of montage.
description: SigMa - Rivista di Letterature comparate, Teatro e Arti dello spettacolo, N. 7 (2023): Fughe e ritorni. Riscritture dell’esodo nelle arti contemporanee
Dimensions of managerial and professional women’s stress : interpersonal conflict and distress
Creators: name: Portello, Jacqueline Yvonne
Publisher: name: University of British Columbia
Year: 2009

description: The purpose of this study was to examine Lazarus and Folkman's (1984) stress and coping framework in the context of work-related interpersonal stressors. Drawing on Long, Kahn, and Schutz's (1992) stress and coping model for managerial women, I examined the relative influences of individual differences, cognitive appraisals, coping strategies, and the work environment on the experiences of distress for managerial and professional women who reported interpersonal conflicts as a source of occupational stress. The data were collected prospectively from 157 managerial and professional women (M age 41.2) employed at three-provincial universities. Participants completed three sets of questionnaires administered 2-weeks apart. The first set of questionnaires assessed demographic characteristics and dimensions of participants' personality (gender-role orientation and trait anxiety); the second set assessed stress appraisals, coping strategies (engagement and disengagement), the work environment, and experiences of daily hassles; and the third set assessed psychosomatic distress. Path analysis using LISREL VIII (Jöreskog & Sorbom, 1993) was performed to examine the hypothesized relationships among antecedent, contextual, mediating, and outcome variables central to Lazarus and Folkman's (1984) theoretical framework and Long et al.'s (1992) stress and coping model. Based on the first-order partial correlation matrix, controlling for the effects of negative affective traits, results indicated an overall poor fitting model, X² (41, N=157)=124.89, p <.001, Q=3.0, GFI=.90, AGFI=.75, RMSR=.09, CFI=.70, and D₂=.75. The pattern of variable relationships in the model provides partial support for both the hypothesized model and Lazarus and Folkman's theoretical assumptions. Within the model, work support was positively related to situational control appraisals and negatively associated with threatening work goal attainment appraisals. Unexpectedly, instrumental personality traits had a positive effect on upsetting appraisals of interpersonal work stressors. As hypothesized, situational control appraisals were negatively associated with disengagement coping and positively related to engagement coping within the model. Threatening work goal attainment appraisals had a positive effect on both engagement and disengagement coping. Additionally, upsetting appraisals predicted both disengagement coping and distress, and positive relationships were found between disengagement coping and daily hassles and between daily hassles and distress within the model. The hypothesized mediational role of cognitive appraisals was not supported in this study. Results also yielded nonsignificant relationships between expressive personality traits and both work support and stressor appraisals. Implications of these results and suggestions for future research are discussed.
Πρόγραμμα Κοινωνικής Ένταξης 4ου Ειδικού Δημοτικού Σχολείου Θεσσαλονίκης: η οπτική της οικογένειας και των εθελοντών
Creators: name: Αναστασιάδης, Χαράλαμπος Ορέστη
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: Ειδική αγωγή
Κοινωνική ένταξη
Κοινωνικός αποκλεισμός
Special education
Social integration
Social exclusion

description: Η παρούσα έρευνα μελετά το πώς περιγράφουν γονείς ατόμων με αναπηρίες και εθελοντές τα αποτελέσματα του προγράμματος κοινωνικής ένταξης του 4ου Ειδικού Δημοτικού Σχολείου Θεσσαλονίκης. Στην παρούσα έρευνα γίνεται εκτενής αναφορά στις προσεγγίσεις που έχουν ακολουθηθεί στο παρελθόν για το θέμα της αναπηρίας. Παρατίθενται το διεθνές και ελληνικό πλαίσιο που αφορά τα δικαιώματα και την εκπαίδευση των Αμεα. Εν συνεχεία ακολουθεί περιγραφή των καταστάσεων που βιώνει η οικογένεια του παιδιού που ορίζεται ως «ανάπηρο» από το ευρύτερο κοινωνικό σύνολο. Παράλληλα τονίζεται η μέχρι στιγμής αντίληψη που επικρατεί για το θέμα της αναπηρίας, η οποία είναι άμεσα συναρτώμενη με τις εκπαιδευτικές προσεγγίσεις που έχουν ακολουθηθεί ως σήμερα στην Ελλάδα. Ακολουθεί το θεωρητικό υπόβαθρο της σχολικής και κοινωνικής ένταξης ως και η σημασία της εφαρμογής της κυρίως. Γίνεται εκτενής αναφορά στο μοντέλο εκπαίδευσης του σχολείου και στο πρόγραμμα ένταξης που ακολουθεί. Ακολουθεί ανάλυση συνεντεύξεων και αναφορά των αποτελεσμάτων που προέκυψαν μέσα από συνεντεύξεις που διενεργήθηκαν από τους γονείς μαθητών του προγράμματος ένταξης του 4ου Ειδικού σχολείο και εθελοντές που συμμετείχαν σε αυτό.
description: The present research studies how parents of individuals with disabilities and volunteers describe the results of program of social integration of 4th Special Primary School of Thessaloniki. In the present research becomes extensive report in the approaches that have been followed in the past for the subject of disability. There are mentions about the international and Greek frame that concerns the rights and the education of people with disabilities. Afterwards it follows a description of situations that the family of a child that is fixed as “disabled” by the wider community experiences. At the same time is reported the actual perception that prevails for the subject of disability, which is immediately associated to the educational approaches that have been followed until today in Greece. Then it follows the theoretical background of school and social integration and the importance of its adoption in practice. Consequently there is an extensive report in the model of education of school and in the program of integration that follows. Then is accomplished an analysis of interviews and report of results that arose from interviews that were held by the parents of students of program of integration of 4th Special Primary School and volunteers that participated in this.
HeM3D: Heterogeneous Manycore Architecture Based on Monolithic 3D Vertical Integration
Creators: name: Arka, Aqeeb Iqbal
name: Joardar, Biresh Kumar
name: Kim, Ryan Gary
name: Kim, Dae Hyun
name: Doppa, Janardhan Rao
name: Pande, Partha Pratim
Publisher: name: arXiv
Year: 2020
Subjects: subject: Hardware Architecture (cs.AR)
subject: FOS: Computer and information sciences
subject: C.2

description: Heterogeneous manycore architectures are the key to efficiently execute compute- and data-intensive applications. Through silicon via (TSV)-based 3D manycore system is a promising solution in this direction as it enables integration of disparate computing cores on a single system. However, the achievable performance of conventional through-silicon-via (TSV)-based 3D systems is ultimately bottlenecked by the horizontal wires (wires in each planar die). Moreover, current TSV 3D architectures suffer from thermal limitations. Hence, TSV-based architectures do not realize the full potential of 3D integration. Monolithic 3D (M3D) integration, a breakthrough technology to achieve - More Moore and More Than Moore - and opens up the possibility of designing cores and associated network routers using multiple layers by utilizing monolithic inter-tier vias (MIVs) and hence, reducing the effective wire length. Compared to TSV-based 3D ICs, M3D offers the true benefits of vertical dimension for system integration: the size of a MIV used in M3D is over 100x smaller than a TSV. In this work, we demonstrate how M3D-enabled vertical core and uncore elements offer significant performance and thermal improvements in manycore heterogeneous architectures compared to its TSV-based counterpart. To overcome the difficult optimization challenges due to the large design space and complex interactions among the heterogeneous components (CPU, GPU, Last Level Cache, etc.) in an M3D-based manycore chip, we leverage novel design-space exploration algorithms to trade-off different objectives. The proposed M3D-enabled heterogeneous architecture, called HeM3D, outperforms its state-of-the-art TSV-equivalent counterpart by up to 18.3% in execution time while being up to 19 degrees Celcius cooler.
description: This work has been accepted in ACM Transactions on Design Automation of Electronic Systems
Who Controls Your Energy? On the (In)Security of Residential Battery Energy Storage Systems
Creators: name: Baumgart, Ingmar
name: Börsig, Matthias
name: Goerke, Niklas
name: Hackenjos, Timon
name: Rill, Jochen
name: Wehmer, Marek
Publisher: name: Institute of Electrical and Electronics Engineers (IEEE)
Year: 2019

description: The home Battery Energy Storage System (BESS) industry is on the rise [1]. Newer models are built as Internet-connected devices that offer new service models for customers and manufacturers alike. This approach, as can be observed from emerging Internet of Things (IoT) devices in the last decade, brings new challenges and issues with it. First of all, threats to user privacy and botnet attacks come to mind. More importantly, there are now substantial advances to put flexible BESS in more critical roles in the power grid and let them provide primary balancing power in order to compensate fluctuations [2].
However, while the safety properties of such systems are currently being explored by researchers [3], their security is mostly unexplored and unregulated. To explore the state of security of residential BESS, we systematically analyzed commercially available storage systems from ten different manufacturers, who have a combined market share of more than 60 percent in Germany [4]. We show that all of them have security issues and four of them contain severe security flaws. In order to exemplify the deficit in the industry to properly secure Internet connected devices, we present three attacks in detail.
Supramolecular Co(II)-[2 x 2] grids: Metamagnetic behavior in a single molecule
Creators: name: Waldmann, O.
name: Ruben, M.
name: Ziener, U.
name: Müller, P.
name: Lehn, J. M.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The magnetic anisotropy of the supramolecular [2 x 2] grid [Co(II)4L4]8+, with a bis(bipyridyl)-pyrimidine based ligand L, was investigated by single-crystal magnetization measurements at low temperatures. The magnetization curves exhibit metamagnetic like behavior and are explained by the weak-exchange limit of a minimal spin Hamiltonian including Heisenberg exchange, easy-axis ligand fields, and the Zeeman term. It is also shown that the magnetic coupling strength can be varied by the substituent R1 in the 2-position on the central pyrimidine group of the ligand L.
description: 19 douple-spaced pages, 5 figures, to appear in Inorg. Chem
Gamma-Ray Burst Triangulation with a Near-Earth Network
Creators: name: Hurley, Kevin C.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: We study the characteristics of Near-Earth-Networks (NENs) of gamma-ray burst (GRB) detectors, with the objective of defining a network with all-sky, full-time localization capability for multi-messenger astrophysics. We show that a minimum network consisting of 9 identical spacecraft in two orbits with different inclinations provides a good combination of sky coverage with several-degree localization accuracy with detector areas of 100 cm$^2$. In order to achieve this, careful attention must be paid to systematics. This includes accurate photon timing ($\sim$ 0.1 ms), good energy resolution ($\sim$ 10\%), and reduction of Earth albedo, which are all within current capabilities. Such a network can be scaled in both the number and size of detectors to produce increased accuracy. We introduce a new method of localization which does not rely on on-board trigger systems or on the cross-correlation of time histories, but rather, in ground processing, tests positions over the entire sky and assigns probabilities to them to detect and localize events. We demonstrate its capabilities with simulations. If the NEN spacecraft can downlink at least several hundred time- and energy-tagged events per second, and the data can be ground-processed as they are received, it can in principle derive GRB positions in near-real time over the entire sky.
description: 9 pages, 7 figures. Accepted for publication in the Astrophysical Journal
Evolution of a quantum spin system to its ground state: Role of entanglement and interaction symmetry
Creators: name: Yuan, S.
name: Katsnelson, M. I.
name: De Raedt, H.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study the decoherence of two ferro- and antiferromagnetically coupled spins that interact with a frustrated spin-bath environment in its ground state. The conditions under which the two-spin system relaxes from the initial spin-up - spin-down state towards its ground state are determined. It is shown that the two-spin system relaxes to its ground state for narrow ranges of the model parameters only. It is demonstrated that the symmetry of the coupling between the two-spin system and the environment has an important effect on the relaxation process. In particular, we show that if this coupling conserves the magnetization, the two-spin system readily relaxes to its ground state whereas a non-conserving coupling prevents the two-spin system from coming close to its ground state.
description: to appear in Phys. Rev. A
Atmospheric MUons from PArametric formulas: a fast GEnerator for neutrino telescopes (MUPAGE)
Creators: name: Carminati, G.
name: Margiotta, A.
name: Spurio, M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: Astrophysics (astro-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Neutrino telescopes will open, in the next years, new opportunities in observational high energy astrophysics. For these experiments, atmospheric muons from primary cosmic ray interactions in the atmosphere play an important role, because they provide the most abundant source of events for calibration and test. On the other side, they represent the major background source. In this paper a fast Monte Carlo generator (called MUPAGE) of bundles of atmospheric muons for underwater/ice neutrino telescopes is presented. MUPAGE is based on parametric formulas [APP25(2006)1] obtained from a full Monte Carlo simulation of cosmic ray showers generating muons in bundle, which are propagated down to 5 km w.e. It produces the event kinematics on the surface of a user-defined virtual cylinder, surrounding the detector. The multiplicity of the muons in the bundle, the muon spatial distribution and energy spectrum are simulated according to a specific model of primary cosmic ray flux, with constraints from measurements of the muon flux with underground experiments. As an example of the application, the result of the generation of events on a cylindrical surface of 3 km^2 at a depth of 2450 m of water is presented.
description: 20 pages, 4 figures
Multi-colour optical monitoring of eight red blazars
Creators: name: Gu, Minfeng
name: Lee, C. -U.
name: Pak, Soojong
name: Yim, H. S.
name: Fletcher, A. B.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present the observational results of multi-colour optical monitoring of eight red blazars from 2003 September to 2004 February. The aim of our monitoring is to investigate the spectral variability as well as the flux variations at short and long time scales. The observations were carried out using the 1.0 m robotic telescope of Mt. Lemmon Optical Astronomy Observatory, in Arizona, USA, the 0.6 m telescope of Sobaeksan Optical Astronomy Observatory and the 1.8 m telescope of Bohyunsan Optical Astronomy Observatory, in the Republic of Korea. During the observations, all sources show strong flux variations with amplitudes of larger than 0.5 mag. Variations with amplitudes of over 1 mag are found in four sources. Intraday variations with amplitudes larger than 0.15 mag, and a rapid brightness increase with a rate of ~0.2 mag per day in four days, are detected in S5 0716+71. We investigate the relationship between the colour index and source brightness for each source. We find that two out of three FSRQs tend to be redder when they are brighter, and, conversely, all BL Lac objects tend to be bluer. In particular, we find a significant anti-correlation between the V-I colour index and R magnitude for 3C 454.3. This implies that the spectrum became steeper when the source was brighter, which is opposite to the common trend for blazars. In contrast, significant positive correlations are found in 3C 66A, S5 0716+71, and BL Lac. However, there are only very weak correlations for PKS 0735+17 and OJ 287. We propose that the different relative contributions of the thermal versus non-thermal radiation to the optical emission may be responsible for the different trends of the colour index with brightness in FSRQs and BL Lac objects.
description: 15 pages, 12 figures. Accepted for publication in A&A
Εφαρμογή της τεχνολογίας του υπερκρίσιμου διοξειδίου του άνθρακα για τον καθαρισμό υφάσματος
Creators: name: Ασλανίδου, Δήμητρα Κωνσταντίνου
Publisher: name: Aristotle University of Thessaloniki
Year: 2012
Subjects: Υπερκρίσιμα ρευστά
Διοξείδιο του άνθρακα
Συντήρηση υφασμάτων
Supercritical fluids
CO2
Textile conservation

description: Στην παρούσα εργασία σχεδιάστηκε και μελετήθηκε ένα σύστημα καθαρισμού το οποίο αποτελείται από υπερκρίσιμο διοξείδιο του άνθρακα, νερό και σωματίδια ανθρακικού ασβεστίου. Μελετήθηκαν οι συνθήκες υπό τις οποίες μπορεί να γίνει ο καθαρισμός. Εφαρμόστηκαν τρεις διαφορετικοί ρύποι, ελαιόλαδο (23% w/w), κουνελόκολλα (18% w/w) και πάστα από παντζάρι (17% w/w). Τα πειράματα διεξήχθησαν στις πιέσεις των 200, 270, και 340bar, σε 4 χρόνους καθαρισμού από 30 έως 120min. Τα ποσοστά αφαίρεσης των λεκέδων ήταν της τάξης του 70-85%, 90-95% και 80-95% αντίστοιχα. Τα αποτελέσματα του καθαρισμού αξιολογήθηκαν και με μετρήσεις των χρωματομετρικών συντεταγμένων των δειγμάτων πριν και μετά τον καθαρισμό. Σελα τα δείγματα οι χρωματικές συντεταγμένες προσεγγίζουν τις τιμές του υφάσματος πριν τον καθαρισμό. Στη συνέχεια εφαρμόστηκε ο καθαρισμός σε μεταξωτά και βαμβακερά δείγματα βαμμένα με φυσικές χρωστικές.
description: The study here presented introduces a new innovating textile cleaning method that does not require the use of detergents and/ or organic solvents. The proposed technique is developed for the conservation of textiles of historical and/or artistic value. The studied methodology uses supercritical carbon dioxide, water and fine pulverized limestone as a stabilizer. Cotton textile samples have been soiled with olive oil (23% w/w), rabbit skin glue (18% w/w) and beetroot paste (17% w/w). The cleaning performance has been tested for 3 different operating pressures (200, 270 and 340bar). The duration of the cleaning varied from 30 to 120 minutes. The soil removal reached the 85, 95 and 95% for olive oil, rabbit skin glue and beetroot respectively. The cleaning results were also evaluated by colorimetric measurements. In all cases chromatic values of the cleaned samples approach the ones of the unsoiled samples. Choosing 200bar operating pressure and 60 minutes cleaning time, the cleaning was performed in cotton and silk textiles dyed with natural organic dyes.
Entropy production in exactly solvable systems
Creators: name: Cocconi, Luca
name: Garcia-Millan, Rosalba
name: Zhen, Zigan
name: Buturca, Bianca
name: Pruessner, Gunnar
Publisher: name: arXiv
Year: 2020
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: The rate of entropy production by a stochastic process quantifies how far it is from thermodynamic equilibrium. Equivalently, entropy production captures the degree to which detailed balance and time-reversal symmetry are broken. Despite abundant references to entropy production in the literature and its many applications in the study of non-equilibrium stochastic particle systems, a comprehensive list of typical examples illustrating the fundamentals of entropy production is lacking. Here, we present a brief, self-contained review of entropy production and calculate it from first principles in a catalogue of exactly solvable setups, encompassing both discrete- and continuous-state Markov processes, as well as single- and multiple-particle systems. The examples covered in this work provide a stepping stone for further studies on entropy production of more complex systems, such as many-particle active matter, as well as a benchmark for the development of alternative mathematical formalisms.
description: 33 pages, 13 figures
Quantum tomography of noisy ion-based qudits
Creators: name: Bantysh, B. I.
name: Bogdanov, Yu. I.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Quantum tomography makes it possible to obtain comprehensive information about certain logical elements of a quantum computer. In this regard, it is a promising tool for debugging quantum computers. The practical application of tomography, however, is still limited by systematic measurement errors. Their main source are errors in the quantum state preparation and measurement procedures. In this work, we investigate the possibility of suppressing these errors in the case of ion-based qudits. First, we will show that one can construct a quantum measurement protocol that contains no more than a single quantum operation in each measurement circuit. Such a protocol is more robust to errors than the measurements in mutually unbiased bases, where the number of operations increases in proportion to the square of the qudit dimension. After that, we will demonstrate the possibility of determining and accounting for the state initialization and readout errors. Together, the measures described can significantly improve the accuracy of quantum tomography of real ion-based qudits.