cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Space-based tests of gravity with laser ranging
Creators: name: Turyshev, Slava G
name: Williams, James G.
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Existing capabilities in laser ranging, optical interferometry and metrology, in combination with precision frequency standards, atom-based quantum sensors, and drag-free technologies, are critical for the space-based tests of fundamental physics; as a result, of the recent progress in these disciplines, the entire area is poised for major advances. Thus, accurate ranging to the Moon and Mars will provide significant improvements in several gravity tests, namely the equivalence principle, geodetic precession, PPN parameters $β$ and $γ$, and possible variation of the gravitational constant $G$. Other tests will become possible with development of an optical architecture that would allow proceeding from meter to centimeter to millimeter range accuracies on interplanetary distances. Motivated by anticipated accuracy gains, we discuss the recent renaissance in lunar laser ranging and consider future relativistic gravity experiments with precision laser ranging over interplanetary distances.
description: 14 pages, 2 figures, 1 table. To appear in the proceedings of the International Workshop "From Quantum to Cosmos: Fundamental Physics Research in Space", 21-24 May 2006, Warrenton, Virginia, USA http://physics.jpl.nasa.gov/quantum-to-cosmos/
Domain walls without a potential
Creators: name: Deffayet, Cédric
name: Larrouturou, François
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We show that domain walls, or kinks, can be constructed in simple scalar theories where the scalar has no potential. These theories belong to a class of k-essence where the Lagrangian vanishes identically when one lets the derivatives of the scalar vanish. The domain walls we construct have positive energy and stable quadratic perturbations. As particular cases, we find families of theories with domain walls and their quadratic perturbations identical to the ones of the canonical Mexican hat or sine-Gordon scalar theories. We show that canonical and non canonical cases are nevertheless distinguishable via higher order perturbations or a careful examination of the energies. In particular, in contrast to the usual case, our walls are local minima of the energy among the field configuration having some fixed topological charge, but not global minima.
description: 24 pages, 5 figures
Recurrence of random walk traces
Creators: name: Benjamini, Itai
name: Gurel-Gurevich, Ori
name: Lyons, Russell
Publisher: name: arXiv
Year: 2006
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 60J05 (Primary) 60D05 (Secondary)

description: We show that the edges crossed by a random walk in a network form a recurrent graph a.s. In fact, the same is true when those edges are weighted by the number of crossings.
description: Published at http://dx.doi.org/10.1214/009117906000000935 in the Annals of Probability (http://www.imstat.org/aop/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Dosimetric characterisation and application to radiation biology of a kHz laser-driven electron beam
Creators: name: Cavallone, Marco
name: Rovige, Lucas
name: Huijts, Julius
name: Bayart, Émilie
name: Delorme, Rachel
name: Vernier, Aline
name: Jorge, Patrik Gonçalves
name: Moeckli, Raphaël
name: Deutsch, Eric
name: Faure, Jérôme
name: Flacco, Alessandro
Publisher: name: arXiv
Year: 2020
Subjects: subject: Accelerator Physics (physics.acc-ph)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: Laser-plasma accelerators can produce ultra short electron bunches in the femtosecond to picosecond duration range, resulting in high peak dose rates in comparison with clinical accelerators. This peculiar characteristic motivates their application to radiation biology studies to elucidate the effect of the high peak dose rate on the biological response of living cells, which is still being debated. Electron beams driven by kHz laser systems may represent an attractive option for such applications, since the high repetition rate can boost the mean dose rate and improve the stability of the delivered dose in comparison with J-class laser accelerators running at 10 Hz. In this work, we present the dosimetric characterisation of a kHz, low energy laser-driven electron source and preliminary results on in-vitro irradiation of cancer cells. A shot-to-shot dosimetry protocol enabled to monitor the beam stability and the irradiation conditions for each cell sample. Results of survival assays on HCT116 colorectal cancer cells are in good agreement with previous findings reported in literature and validate the robustness of the dosimetry and irradiation protocol.
Electronic, optical, vibrational and thermodynamic properties of phaBN structure: a first principles study
Creators: name: Pontes, J. M.
name: Frazão, N. F.
name: Azevedo, David L.
name: Lima, Jonas R. F.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: In 2015, a new two dimensional (2D) carbon allotrope, called phagraphene, was theoretically proposed. Based on this structure, we propose here a new boron nitride structure called phaBN. It is composed by three types of rings: pentagons, hexagons and heptagons. We investigate the electronic, optical, vibrational and thermodynamic properties of phaBN using first-principles calculations in a density functional theory (DFT) framework. Our calculations revealed that the phaBN has an energy gap of 2.739 eV, which is almost half of the energy gap of the hexagonal boron nitride (h-BN), thus being a semiconductor material. By means of the optical, vibrational and thermodynamic properties, it was possible to observe the absorption interval, the stability of the structure and its formation process, respectively.
Extreme statistics and volume fluctuations in a confined one-dimensional gas
Creators: name: Bertin, Eric
name: Clusel, Maxime
name: Holdsworth, Peter C. W.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We consider the statistics of volume fluctuations in a one-dimensional classical gas of non-interacting particles confined by a piston, and subjected to an arbitrary external potential. We show that despite the absence of interactions between particles, volume fluctuations of the gas are non-Gaussian, and are described by generalized extreme value distributions. The continuous shape parameter of these distributions is related to the ratio between the force acting on the piston, and the force acting on the particles. Gaussian fluctuations are recovered in the strong compression limit, when the effect of the external potential becomes negligible. Consequences for the thermodynamics are also discussed.
description: 15 pages, 2 figures, revised version with appendices added
Ο άγιος Θεόδωρος ο Στουδίτης ως διδάσκαλος και παιδαγωγός των μοναχών:
Creators: name: Βλαχάκη, Θεοδώρα Κυριάκου
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Θεόδωρος Στουδίτης
Μονή Στουδίου
Βυζάντιο εκπαίδευση
Theodore Stouditis
Monastery of Studium
Byzantine education

description: Κάθε σύγχρονος παιδαγωγός διακατέχεται από διαρκή αγωνία για την καλύτερη επιτέλεση του παιδαγωγικού του έργου. Η μελέτη της ιστορίας της αγωγής μπορεί να αποτελέσει πολύτιμη πηγή γνώσης και ιδεών, καθώς έχει να επιδείξει πολλές προσωπικότητες, που συνέβαλαν στην εξέλιξη της παιδαγωγικής πράξης και έμειναν στην ιστορία ως μεγάλοι παιδαγωγοί. Στην Ορθόδοξη Εκκλησία ιερές μορφές διακρίθηκαν στο χώρο της παιδείας και αναγνωρίστηκαν ως Διδάσκαλοι. Ο άγιος Θεόδωρος ο Στουδίτης (759-826), ηγούμενος και μεταρρυθμιστής της μονής του Στουδίου στην Κωνσταντινούπολη, πολυγραφότατος και θεολογικότατος συγγραφέας, μελετάται ως διδάσκαλος και παιδαγωγός και προβάλλεται ως πρότυπο παιδαγωγού. Δρώντας μέσα στο ευρύτερο εκπαιδευτικό πλαίσιο της ανατολικής και δυτικής μεσαιωνικής Ευρώπης, επιτέλεσε σημαντικό παιδαγωγικό και διδακτικό έργο με κέντρο τη Μονή Στουδίου. Παρουσιά¬ζονται τα στοιχεία που αφορούν στους μαθητές του, μοναχούς και λαϊκούς, στο περιεχόμενο της διδασκαλίας του, στις διδακτικές μεθόδους του, στο διδακτήριο και στις τεχνικές σχολές της μονής. Αναλύονται οι πηγές του διδακτικού-καθοδηγητικού έργου του, καθώς και τα διαχρονικά στοιχεία της παιδαγωγικής του. Τέλος πραγματοποιείται συγκριτική κριτική μελέτη των ανωτέρω με δεδομένα και στοιχεία από τη σύγχρονη αγωγή και ενδεικτικούς εκπροσώπους της και γίνεται απόπειρα διατύπωσης προτάσεων για τον προσδιορισμό των στόχων της σύγχρονης παιδαγωγικής πράξης με βάση το έργο του αγίου Θεοδώρου και την εκπαιδευτική μας εμπειρία.
description: Modern educators constantly strive to develop new and advanced techniques in order to make their work more effective. The study of the history of education can become a source of new insights and ideas, since there are a lot of exemplary figures that have immensly contributed to the development of educational practice and they are accepted as great educators. In the tradition of the Orthodox Church many prominent figures have been recognised as great Masters and skillful teachers. St Theodore of Studium (759-826) is one of the most important persons of the byzantine period. Within the educational framework of eastern and western Europe in the Middle-ages, St Theodore developed a remarkable educational project in the monastery of Studium. In this work we present the evidence about his students, monks or lay persons, the contents of his teaching, his educational methods, his school (didacterion) and the vocational training in the monastery. We also analyse the sources of his educational work and the diachronic elements of this work. Finally, we critically compare all the above to modern educational systems and prominent educators of our time focusing on the educational goals and we attempt to offer some ideas for contemporary teaching and teachers according to St Theodore’s work and our educational experience.
The complex X-ray spectrum of the isolated neutron star RBS1223
Creators: name: Schwope, Axel D.
name: Hambaryan, Valeri
name: Haberl, Frank
name: Motch, Christian
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a first analysis of a deep X-ray spectrum of the isolated neutron star RBS1223 obtained with XMM-Newton. Spectral data from four new monitoring observations in 2005/2006 were combined with archival observations obtained in 2003 and 2004 to form a spin-phase averaged spectrum containing 290000 EPIC-pn photons. This spectrum shows higher complexity than its predecessors, and can be parameterised with two Gaussian absorption lines superimposed on a blackbody. The line centers, E_2 ~ 2E_1, could be regarded as supporting the cyclotron interpretation of the absorption features in a field B ~ 4 x 10**13 G. The flux ratio of those lines does not support this interpretation. Hence, either feature might be of truly atomic origin.
description: 4 pages, 1 figure, to appear in Astrophysics and Space Science, in the proceedings of "Isolated Neutron Stars: from the Interior to the Surface", edited by D. Page, R. Turolla and S. Zane
Brown-York Energy in Spacetimes with Horizon
Creators: name: Mäkelä, Jarmo
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We obtain a simple relationship between the change in the Brown-York energy inside of a closed two-surface just outside of a horizon of spacetime, and the change in the area of that two-surface.
description: 5 pages, no figures. Accepted for publication in the Physical Review D
Spontaneous excitation of an accelerated multilevel atom in dipole coupling to the derivative of a scalar field
Creators: name: Zhu, Yunfeng
name: Yu, Hongwei
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We study the spontaneous excitation of an accelerated multilevel atom in dipole coupling to the derivative of a massless quantum scalar field and separately calculate the contributions of the vacuum fluctuation and radiation reaction to the rate of change of the mean atomic energy of the atom. It is found that, in contrast to the case where a monopole like interaction between the atom and the field is assumed, there appear extra corrections proportional to the acceleration squared, in addition to corrections which can be viewed as a result of an ambient thermal bath at the Unruh temperature, as compared with the inertial case, and the acceleration induced correction terms show anisotropy with the contribution from longitudinal polarization being four times that from the transverse polarization for isotropically polarized accelerated atoms. Our results suggest that the effect of acceleration on the rate of change of the mean atomic energy is dependent not only on the quantum field to which the atom is coupled, but also on the type of the interaction even if the same quantum scalar field is considered.
description: 11 pages, no figures
Elastically driven Kelvin-Helmholtz-like instability in planar channel flow
Creators: name: Jha, Narsing K.
name: Steinberg, Victor
Publisher: name: arXiv
Year: 2020
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: Kelvin-Helmholtz instability (KHI) is widely spread in nature on scales from micrometer up to Galactic one. This instability refers to the growth of perturbation of an interface between two parallel streams of Newtonian fluids with different velocities and densities, destabilized by shear strain and stabilized by density stratification with the heavier fluid at the bottom. Here, we report the discovery of the purely elastic KH-like instability in planar straight channel flow of viscoelastic fluid, which is theoretically considered to be stable. However, despite the remarkable similarity to the Newtonian KHI temporal interface dynamics, the elastic KHI reveals qualitatively different instability mechanism. Indeed, the velocity difference across the interface strongly fluctuates and non-monotonically varies in time due to energy pumping by elastic waves, detected in the flow. A correlation of the elastic wave intensity and efficiency of the elastic KHI in different regimes suggests that the competition between the destabilizing factor of the elastic waves and the stabilizing effect of the elastic stress difference generated by the velocity difference at the interface is the novel instability mechanism of the elastic KHI.
description: 15 pages, 5 figures
Εφαρμογές λογισμικού ανοιχτού κώδικα (open source software) στη δημόσια διοίκηση και την τοπική αυτοδιοίκηση: μία διεθνής εμπειρία:
Creators: name: Γιαννάκη, Θεοδώρα Νικολάου
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Ελεύθερο λογισμικό
Δημόσια διοίκηση
Τοπική αυτοδιοίκηση
Free software
Public administration
Local government

description: Ο βασικός στόχος της παρούσας διπλωματικής εργασίας είναι η μελέτη εφαρμογών, οι οποίες βασίζονται στο λογισμικό ανοιχτού κώδικα στον τομέα της δημόσιας διοίκησης και τοπικής αυτοδιοίκησης σε διεθνές επίπεδο. Αρχικά, περιγράφονται τα πλεονεκτήματα και τα εμπόδια εφαρμογής του παραπάνω λογισμικού, καθώς επίσης και οι άδειες οι οποίες επιτρέπουν τη χρήση του. Στη συνέχεια, μέσα από τη μελέτη περιπτώσεων διαφόρων κυβερνήσεων, περιγράφονται οι πολιτικές και μεθοδολογίες τις οποίες ακολούθησαν προκειμένου να υιοθετήσουν και να χρησιμοποιήσουν το λογισμικό ανοιχτού κώδικα. Επίσης, αναφέρονται τα έργα και οι εφαρμογές τις οποίες ανέπτυξαν οι δημόσιες διοικήσεις για να πετύχουν τη μετάβαση από το ιδιόκτητο λογισμικό στο λογισμικό ανοιχτού κώδικα. Τέλος, δίνεται η έννοια της ανοιχτής διακυβέρνησης και περιγράφεται ο τρόπος με τον οποίο οι πολίτες μπορούν να συμμετέχουν σε αυτή.
description: The main objective of the present thesis is to study applications, which are based on open source software in public administration and local government in international level. Initially, the benefits and obstacles of implementation of the above software are described, as well as the licenses which allow its use. Then, through case studies of various governments, policies and methodologies, which are followed in order to adopt and use open source, are described. Also, various projects and applications, which are developed by the public administration to achieve the transition from proprietary software to open source software, are mentioned. Finally, it is given the concept of open government and the way in which citizens can participate in it.
Ελληνική εθνική ταυτότητα και στάσεις απέναντι στους μετανάστες:
Creators: name: Γκαϊφύλλιας, Κωνσταντίνος Αθανασίου
name: Γαλατά, Χρυσούλα Βασιλείου
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: εθνικισμός
πατριωτισμός
μετανάστες
nationalism
patriotism
immigrants

description: Υπόθεση της έρευνας ήταν ότι το πατριωτικό φρόνημα των Ελλήνων θα σχετίζεται με ρατσιστικά αισθήματα απέναντι στους μετανάστες που κατοικούν στην Ελλάδα. Το δείγμα αποτέλεσαν 199 ενήλικες με ελληνική υπηκοότητα, από τις περιοχές της Θεσσαλονίκης, της Αθήνας, της Δράμας και της Κομοτηνής και σε αυτούς χορηγήθηκε ερωτηματολόγιο με δύο κλίμακες ερωτήσεων τύπου likert. Η μια από αυτές φτιάχτηκε για να μετρά πατριωτισμό και η άλλη ρατσισμό, ενώ στο ερωτηματολόγιο υπήρχε και μία σελίδα συμπλήρωσης δημογραφικών στοιχείων (ηλικία, τόπος κατοικίας, εκπαιδευτικό επίπεδο, επάγγελμα, πολιτικές και θρησκευτικές πεποιθήσεις). Τα αποτελέσματα αποκάλυψαν τη συσχέτιση του πατριωτισμού με το ρατσισμό αλλά και την επιμέρους εξάρτησή τους από δημογραφικούς παράγοντες. Πιο συγκεκριμένα, φάνηκε πως ο πατριωτισμός συσχετίζεται με την ηλικία και το εκπαιδευτικό επίπεδο ενώ ο ρατσισμός βρέθηκε να συσχετίζεται, εκτός από τον ηλικιακό και εκπαιδευτικό παράγοντα, με το φύλο, καθώς τα ποσοστά ήταν μεγαλύτερα στους άνδρες αλλά και την επαγγελματική ιδιότητα. Ο τόπος καταγωγής των συμμετεχόντων, αν και δεν παρουσίαζε στατιστική σημαντικότητα στη συνάρτησή του με τις μεταβλητές ρατσισμού και πατριωτισμού, επιδέχεται σχολιασμού και περαιτέρω διερεύνησης.
description: Case of the investigation was that the patriotic spirit of the Greeks will relate to racist sentiments towards immigrants residing in Greece. The sample consisted of 199 adults with Greek citizenship of Thessaloniki, Athens, Drama and Komotini. Those adults administered a questionnaire of two likert type scales. One of them was made to measure patriotism and the other was made to measure racism, while in the questionnaire was included one page which was about to be filled by demographics (age, place of residence, educational level, occupation, political and religious beliefs). The results revealed the association of patriotism with racism and the partial dependence on demographic factors. More specifically, it appeared that patriotism is associated with age and educational level, while racism was associated, apart from age and educational factor, with gender . The place of origin of the participants, was not statistically significant in the context of the variables of racism and patriotism, but this is open to comment and further investigation.
Ιδιωτισμοί: η δομή «χ’ κ(α)ι χ’»:
Creators: name: Τηλικίδου, Ελπίδα Ιωάννη
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Ιδιωτισμοί
Αναδιπλασιασμός
Υποκειμενικότητα
Idioms
Reduplication
Subjectivity

description: Στόχος της παρούσας διπλωματικής εργασίας είναι η περιγραφή και η κατανόηση των ιδιωτισμών κυρίως εκείνων με τη δομή/μορφή χ’ κ(α)ι χ’. Οι ιδιωτισμοί είναι παγιωμένες εκφράσεις με ιδιαίτερη, μη προβλέψιμη σημασία καθώς δεν πηγάζει από το σημασιολογικό φορτίο του κάθε γλωσσικού στοιχείου που τους απαρτίζουν (καταπατούν την αρχή της συνθετικότητας). Περιγράφεται ο τρόπος δημιουργίας τους (αναδιπλασιασμός, γραμματικοποίηση, ευφημισμός, μεταφορά), η σημασία τους και η λειτουργία τους κυρίως με τη βοήθεια παραδειγμάτων. Στη νέα ελληνική συναντούμε έντεκα κατηγορίες ιδιωτισμών (δική μου η κατάταξη). Η κατηγορία που βρίσκεται στο κέντρο του ενδιαφέροντος της παρούσας περιγραφής είναι εκείνη που περιλαμβάνει τους ιδιωτισμούς με τη δομή/μορφή χ’ κ(α)ι χ’: εμείς κι εμείς, μόνο και μόνο, έτσι κι έτσι, αυτό κι αυτό, άλλα κι άλλα, ένα κι ένα, ό,τι κι ό,τι, τόσα και τόσα, πού και πού, όλα κι όλα, πώς και πώς, όπως κι όπως. Οι ιδιωτισμοί αυτής της μορφής έχουν διάφορες σημασίες/λειτουργίες: αποκλεισμός-αποκλειστικότητα («εμείς κι εμείς», «μόνο και μόνο»), εναντίωση («όλα κι όλα»), επιστημική-συνομιλιακή δείξη («έτσι κι έτσι») κ.α. Ο κοινός παρανομαστής αυτών των παγιωμένων συνταγμάτων είναι η υποκειμενικότητα. Εκδηλώνουν κομμάτια του εσωτερικού κόσμου του ομιλητή, προδίδουν σκέψεις και συναισθήματά του. Ο ομιλητής χρησιμοποιώντας τους ιδιωτισμούς επιλέγει να εμπλακεί σε ό,τι συμβαίνει γύρω του και να εκφράσει την άποψή του και τα συναισθήματά του.
description: The purpose of this thesis is the description of idioms especially those with the structure/form x’ çe x’. Idioms are well fixed expressions with special meaning unpredictable as not derived from the semantic load of each language element of idioms (violate the principle of compositionality). I describe their way of creation (reduplication, grammaticalization, euphemism, metaphor), their meaning and function mainly through examples. In modern Greek we find eleven categories of idioms (the ranking is mine). The category that is located in the center of my interest in this description is the one that includes idioms with the structure/form x’ çe x’: emis çe emis, mono çe mono, etsi çe etsi, afto çe afto, ala çe ala, ena çe ena, oti çe oti, tosa çe tosa, pu çe pu, ola çe ola, pos çe pos, opos çe opos. These idioms have different meanings/functions: exclusive (“emis çe emis”, “mono çe mono”), objection (“ola çe ola”), epistemic-conversational deixis (“etsi çe etsi”), place-time (“pu çe pu”) etc. The common denominator in these particular expressions is subjectivity. Idioms exhibit pieces of the inner world of the speaker, betray his thoughts and feelings. The speaker using idioms chooses to get involved in what is happening around him and express his views and feelings.
Impact of fire on soil microbiota diversity and abilities to induce regrowth in plants post-fire in Southern California
Creators: name: Barney, Nathan
name: Cervantes, Mireya
name: Silacheva, Irina
name: Vu, Claire
name: Dao, Christopher
name: Mitchell, Keith
name: Krisanavane Reddi
name: Freise, Amanda C.
Publisher: name: F1000 Research Limited
Year: 2019

description: Metagenomic studies reveal important information about the composition of the soil microbiome, as well as the functional association between the soil microbes and the surrounding ecosystem. These microbes could help the ecosystem recover following a natural disaster, such as the Skirball fire that burned through Southern California in 2017. This study looks at the potential of the soil microbes to help the plant life recover at the site of the Skirball fire. Soil samples were taken near an Eriogonum fasciculatum (California Buckwheat) native plant at the site of fire in January of 2019. eDNA was extracted and sent for 16S rDNA sequencing, and individual isolates were cultivated and analyzed. Assays for antibiotic production, cellulase production, and nitrogen fixation were performed to determine functional potential of the isolates which could aid in plant reestablishment. Genomic DNA of isolates was extracted, 16S rRNA gene PCR and purification was performed. After Sanger sequencing, sequences were identified through NCBI BLAST and RDP II to determine isolate identities. The 16S rRNA gene targeted eDNA sequences were used to build a community and functional profile, and were compared to the soil sample data from January 2018. Ultimately, it was determined that most isolates were capable of nitrogen fixation and cellulase production, but antibiotic production was inconclusive. Comparisons of the different collection times revealed no significant differences in microbial profiles or functions, implying that the fire did not alter the microbial composition, and suggesting that microbes capable of promoting plant growth are present in the soil after fire.
Near Scale Invariance with Modified Dispersion Relations
Creators: name: Armendariz-Picon, C.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We describe a novel mechanism to seed a nearly scale invariant spectrum of adiabatic perturbations during a non-inflationary stage. It relies on a modified dispersion relation that contains higher powers of the spatial momentum of matter perturbations. We implement this idea in the context of a massless scalar field in an otherwise perfectly homogeneous universe. The couplings of the field to background scalars and tensors give rise to the required modification of its dispersion relation, and the couplings of the scalar to matter result in an adiabatic primordial spectrum. This work is meant to explicitly illustrate that it is possible to seed nearly scale invariant primordial spectra without inflation, within a conventional expansion history.
description: 7 pages and no figures. Uses RevTeX4
Density-Functional Theory of Graphene Sheets
Creators: name: Polini, Marco
name: Tomadin, Andrea
name: Asgari, Reza
name: MacDonald, A. H.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We outline a Kohn-Sham-Dirac density-functional-theory (DFT) scheme for graphene sheets that treats slowly-varying inhomogeneous external potentials and electron-electron interactions on an equal footing. The theory is able to account for the the unusual property that the exchange-correlation contribution to chemical potential increases with carrier density in graphene. Consequences of this property, and advantages and disadvantages of using the DFT approach to describe it, are discussed. The approach is illustrated by solving the Kohn-Sham-Dirac equations self-consistently for a model random potential describing charged point-like impurities located close to the graphene plane. The influence of electron-electron interactions on these non-linear screening calculations is discussed at length, in the light of recent experiments reporting evidence for the presence of electron-hole puddles in nearly-neutral graphene sheets.
description: 11 pages, 9 figures, submitted. High-quality figures can be requested to the authors
Observation of the decay $B^0 \to J/ψη$
Creators: name: Chang, M. -C.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We report the first observation of $B^0 \to J/ψη$ decay. These results are obtained from a data sample that contains 449 million $B\bar{B}$ pairs accumulated at the $Υ(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider. We observe a signal with a significance of 8.1$σ$ and obtain a branching fraction of (9.5 $\pm$ 1.7 (stat) $\pm$ 0.8 (syst))$\times 10^{-6}$.
description: 5 pages, 2 figures, submit to PRL (8 pages, 2 figures, ICHEP'06 Conference Paper)
Efficient 2D Simulation on Moving 3D Surfaces
Creators: name: Morgenroth, Dieter
name: Reinhardt, Stefan
name: Weiskopf, Daniel
name: Eberhardt, Bernhard
Publisher: name: arXiv
Year: 2020
Subjects: subject: Graphics (cs.GR)
subject: FOS: Computer and information sciences
subject: I.3.0

description: We present a method to simulate fluid flow on evolving surfaces, e.g., an oil film on a water surface. Given an animated surface (e.g., extracted from a particle-based fluid simulation) in three-dimensional space, we add a second simulation on this base animation. In general, we solve a partial differential equation (PDE) on a level set surface obtained from the animated input surface. The properties of the input surface are transferred to a sparse volume data structure that is then used for the simulation. We introduce one-way coupling strategies from input properties to our simulation and we add conservation of mass and momentum to existing methods that solve a PDE in a narrow-band using the Closest Point Method. In this way, we efficiently compute high-resolution 2D simulations on coarse input surfaces. Our approach helps visual effects creators easily integrate a workflow to simulate material flow on evolving surfaces into their existing production pipeline.
description: Symposium on Computer Animation (SCA) 2020
Από το Δουβλίνο ΙΙ στο Δουβλίνο ΙΙΙ: ο τριπλός ρόλος του κράτους μέσα σε ένα άδικο σύστημα:
Creators: name: Σαμολαδά, Ελένη Θεόδωρου
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: Δουβλίνο
πρόσφυγες
κράτος
Dublin
refugees
state

description: Σκοπός της διατριβής ήταν η μελέτη του τριπλού ρόλου που καλείται να διαδραματίσει το σύγχρονο κράτος μέλος της Ευρωπαϊκής Ένωσης στα πλαίσια του συστήματος που καθιέρωσε ο Κανονισμός Δουβλίνο ΙΙΙ. Εξετάσαμε τον πρόγονο του εν λόγω Κανονισμού, τον Κανονισμό Δουβλίνο ΙΙ και στη συνέχεια, ασχοληθήκαμε με την ανάλυση των κοινών αρχών στις οποίες βασίζονται. Έχοντας επισημάνει τις ελλείψεις του πρώτου Κανονισμού, παρουσιάσαμε την πρόταση που έγινε για την αναθεώρησή του, καθώς και τις προσπάθειες του Δικαστηρίου της Ευρωπαϊκής Ένωσης και του Ευρωπαϊκού Δικαστηρίου Δικαιωμάτων του Ανθρώπου να επανορθώσουν για αυτές μέσω της σχετικής νομολογίας. Επιπλέον, παραθέσαμε τις νέες υποχρεώσεις που συνεπάγεται για τα κράτη μέλη της Ένωσης η εκσυγχρονισμένη εκδοχή του Κανονισμού και τα νέα καθήκοντα που κλήθηκαν αυτά να αναλάβουν. Τέλος, αναλύσαμε τους τρεις ρόλους που διαδραματίζει το σύγχρονο κράτος μέλος, οι οποίοι περιλαμβάνουν αυτούς της προστασίας των αιτούντων, της αυτοπροστασίας και της προστασίας του Κοινού Ευρωπαϊκού Συστήματος Ασύλου και υπογραμμίσαμε τη σύγκρουση μεταξύ τους.
description: The aim of the present thesis was the study of the three roles that the modern member state of the European Union is expected to play within the framework of the Dublin III Regulation. We examined the ancestor of this Regulation, the Dublin II Regulation and afterwards, we focused on the analysis of the common principles on which they are based. Having highlighted the deficiencies of the first Regulation, we presented the proposal for its revision, as well as the efforts made by the Court of the European Union and by the European Court of Human Rights in order to make up for them through the relevant case law. Moreover, we mentioned the new obligations that the revised version of the Regulation means for the member states of the Union and the new duties they have assumed. Finally, we analyzed the three roles played by the modern member state, which concern the protection of the applicants, the self-protection and the protection of the Common European Asylum System and we underlined the contradiction between them.
On the nuclearity of certain Cuntz-Pimsner algebras
Creators: name: Lledó, Fernando
name: Vasselli, Ezio
Publisher: name: arXiv
Year: 2006
Subjects: subject: Operator Algebras (math.OA)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: We give a short proof of the nuclearity property of a class of Cuntz-Pimsner algebras associated with a Hilbert A-bimodule M, where A is a separable and nuclear C*-algebra. We assume that the left A-action on the bimodule M is given in terms of compact module operators and that M is direct summand of the standard Hilbert module over A.
description: 7 pages
Multiparameter Quantum Deformations of Jordanian Type for Lie Superalgebras
Creators: name: Tolstoy, V. N.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Algebra (math.QA)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: Primary 81R50, Secondary 17B37

description: We discuss quantum deformations of Jordanian type for Lie superalgebras. These deformations are described by twisting functions with support from Borel subalgebras and they are multiparameter in the general case. The total twists are presented in explicit form for the Lie superalgebras sl(m|n) and osp(1|2n). We show also that the classical $r$-matrix for a light-cone deformation of D=4 super-Poincare algebra is of Jordanian type and a corresponding twist is given in explicit form.
description: 9 pages
Lattice dynamics effects on the magnetocrystalline anisotropy energy: application to MnBi
Creators: name: Urru, Andrea
name: Corso, Andrea Dal
Publisher: name: arXiv
Year: 2020
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: Using a first-principles fully relativistic scheme based on ultrasoft pseudopotentials and density functional perturbation theory, we study the magnetocrystalline anisotropy free energy of the ferromagnetic binary compound MnBi. We find that differences in the phonon dispersions due to the different orientations of the magnetization (in-plane and perpendicular to the plane) give a difference between the vibrational free energies of the high-temperature and low-temperature phases. This vibrational contribution to the magnetocrystalline anisotropy energy (MAE) constant, $K_u$, is non-negligible. When the energy contribution to the MAE is calculated by the PBEsol exchange and correlation functional, the addition of the phonon contribution allows to get a $T = 0$ K $K_u$ and a spin-reorientation transition temperature in reasonable agreement with experiments.
description: 6 pages, 4 figures, 2 tables
Superheavy Elements in the Magic Islands
Creators: name: Samanta, Chhanda
Publisher: name: arXiv
Year: 2008
Subjects: subject: Nuclear Theory (nucl-th)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: Recent microscopic calculation based on the density functional theory predicts long-lived superheavy elements in a variety of shapes, including spherical, axial and triaxial configurations. Only when N=184 is approached one expects superheavy nuclei that are spherical in their ground states. Magic islands of extra-stability have been predicted to be around Z=114, 124 or, 126 with N=184, and Z=120, with N=172. However, the question of whether the fission-survived superheavy nuclei with high Z and N would live long enough for detection or, undergo alpha-decay in a very short time remains open. In this talk I shall present results of our calculations of alpha-decay half lives of heavy and superheavy nuclei. Calculations, carried out in a WKB framework using density-dependent M3Y interaction, have been found to reproduce the experimental data quite well. Fission survived Sg nuclei with Z=106, N=162 is predicted to have the highest alpha-decay half life (~3.2 hrs) in the Z=106-108, N=160-164 region called, small island/peninsula. Neutron-rich (N >170) superheavy nuclei with Z >118 are found to have half-lives of the order of microseconds or, less.
description: 9 pages, 1 figure, 1 table; Invited Talk presented at the "Fourth International Conference on Fission and Properties of Neutron-Rich nuclei", held at Sanibel Island, Florida, November 11-17, 2007
The Optimal Isodual Lattice Quantizer in Three Dimensions
Creators: name: Conway, J. H.
name: Sloane, N. J. A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 52C07 (11H55, 94A29)

description: The mean-centered cuboidal (or m.c.c.) lattice is known to be the optimal packing and covering among all isodual three-dimensional lattices. In this note we show that it is also the best quantizer. It thus joins the isodual lattices Z, A_2 and (presumably) D_4, E_8 and the Leech lattice in being simultaneously optimal with respect to all three criteria.
description: 5 pages
A posteriori Error Estimates for Numerical Solutions to Hyperbolic Conservation Laws
Creators: name: Bressan, Alberto
name: Chiri, Maria Teresa
name: Shen, Wen
Publisher: name: arXiv
Year: 2020
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics
subject: 35L65, 65M15

description: The paper is concerned with a posteriori error bounds for a wide class of numerical schemes, for $n\times n$ hyperbolic conservation laws in one space dimension. These estimates are achieved by a "post-processing algorithm", checking that the numerical solution retains small total variation, and computing its oscillation on suitable subdomains. The results apply, in particular, to solutions obtained by the Godunov or the Lax-Friedrichs scheme, backward Euler approximations, and the method of periodic smoothing. Some numerical implementations are presented.
description: 40 pages, 10 figures
Εξερευνώντας το ελληνόφωνο μεταφρασεολογικό τοπίο με οδηγό τον χάρτη του Holmes: μια βιβλιογραφική βάση δεδομένων
Creators: name: Φιλιππίδου, Αικατερίνη Εμμανουήλ
Publisher: name: Aristotle University of Thessaloniki
Year: 2014
Subjects: Ελληνόφωνη Μεταφρασεολογία
Χάρτης του Holmes
Βιβλιογραφική Βάση Δεδομένων
Greek Translation Studies
Holmes’ Map
Bibliographic Database

description: Στόχος της παρούσας διπλωματικής εργασίας είναι η ιχνηλάτηση της ελληνόφωνης μεταφρασεολογικής σκέψης, τόσο μέσα από της υπάρχουσες μελέτες αναφορικά με την ιστορία της θεωρίας της μετάφρασης όσο και μέσα από τη συλλογή και τη καταγραφή της ελληνόγλωσσης και ξενόγλωσσης μεταφρασεολογικής έρευνας στην Ελλάδα και στην Κύπρο από τα μέσα του δεκάτου ενάτου αιώνα έως σήμερα από μεταφρασεολόγους που δραστηριοποιούνται στον ελληνόφωνο χώρο. Η παρούσα έρευνα βασίστηκε στην προϋπάρχουσα μελέτη των Γραμμενίδη και Φλώρου αναφορικά με της ερευνητικές τάσεις και τα επιστημολογικά χαρακτηριστικά της ελληνόφωνης Μεταφρασεολογίας (Grammenidis and Floros, 2013). Οδηγός της σε αυτό το ταξίδι αναζήτησης υπήρξε ο επονομαζόμενος χάρτης του Holmes, μια πρωτοποριακή πρόταση του αμερικανού θεωρητικού James S. Holmes στην προσπάθεια του να υπάρξει μια ονομασία κοινής αποδοχής του αναδυόμενου τότε επιστημονικού κλάδου της Μεταφρασεολογίας, αλλά και να επιτευχθεί μια ευρεία συναίνεση αναφορικά με τον σκοπό και τη δομή του. Η έρευνα πλαισιώνεται από τη δημιουργία μιας βιβλιογραφικής βάσης δεδομένων, τα εξαγόμενα συμπεράσματα της οποίας της επιτρέπουν να προσδιορίσουμε τα ιδιόμορφα χαρακτηριστικά της ελληνόφωνης Μεταφρασεολογίας. Απώτερο στόχο αποτελεί η διάθεση της βιβλιογραφικής βάσης δεδομένων στον ευρύτερο επιστημονικό κόσμο με την ελπίδα να συνεπικουρήσει μελλοντικές ερευνητικές προσπάθειες στο πεδίο της Μεταφρασεολογίας.
description: The aim of this thesis is to trace the reflections upon Translation Studies in the Greek-speaking territory not only through the existing studies on translation history, but also through the collection and recording of the research activity produced either in Greek or another language in Greece and Cyprus from the mid-1900’s until recently by translation scholars who are actively involved in the Greek-speaking territory. This research was based upon the existing study by Grammenidis and Floros with regard to the research trends and epistemological characteristics of the Greek Translation Studies (Grammenidis and Floros, 2013). We were guided through this quest by the so-called Holmes’ map, a pioneering attempt of the American theorist James S. Holmes to achieve unity regarding a commonly accepted name for the emerging at the time field of Translation Studies and a wide consensus with reference to its purpose and structure. The research is framed by a bibliographic database, the extracted data of which allow us to define the distinctive characteristics of the Greek Translation Studies. We are ultimately aiming at placing the bibliographic database at the disposal of the wider scientific community in the hope that future research on the field of Translation Studies could benefit from it.
Cross-Talk between Dnmt2-Dependent tRNA Methylation and Queuosine Modification
Creators: name: Ehrenhofer-Murray, Ann Elizabeth
Publisher: name: Humboldt-Universität zu Berlin
Year: 2017
Subjects: subject: Dnmt2
subject: Pmt1
subject: queuine
subject: queuosine
subject: translation
subject: tRNA cleavage
subject: epitranscriptomics
subject: anticodon modification
subject: 570 Biowissenschaften; Biologie

description: Enzymes of the Dnmt2 family of methyltransferases have yielded a number of unexpected discoveries. The first surprise came more than ten years ago when it was realized that, rather than being DNA methyltransferases, Dnmt2 enzymes actually are transfer RNA (tRNA) methyltransferases for cytosine-5 methylation, foremost C38 (m5C38) of tRNAAsp. The second unanticipated finding was our recent discovery of a nutritional regulation of Dnmt2 in the fission yeast Schizosaccharomyces pombe. Significantly, the presence of the nucleotide queuosine in tRNAAsp strongly stimulates Dnmt2 activity both in vivo and in vitro in S. pombe. Queuine, the respective base, is a hypermodified guanine analog that is synthesized from guanosine-5’-triphosphate (GTP) by bacteria. Interestingly, most eukaryotes have queuosine in their tRNA. However, they cannot synthesize it themselves, but rather salvage it from food or from gut microbes. The queuine obtained from these sources comes from the breakdown of tRNAs, where the queuine ultimately was synthesized by bacteria. Queuine thus has been termed a micronutrient. This review summarizes the current knowledge of Dnmt2 methylation and queuosine modification with respect to translation as well as the organismal consequences of the absence of these modifications. Models for the functional cooperation between these modifications and its wider implications are discussed.
Η Επικοινωνία Ελλήνων Φοιτητών εντός και εκτός Διαδικτύου: Συναισθηματική Αλληλεπίδραση και Αυτοαποκάλυψη:
Creators: name: Μπάραλη, Νικολέτα Απόστολου
Publisher: name: Aristotle University of Thessaloniki
Year: 2015
Subjects: Διαδίκτυο
αλεξιθυμία
αυτοαποκάλυψη
Facebook
Alexithymia
self-disclosure

description: Στην παρούσα έρευνα μελετήθηκε πώς επικοινωνούν οι φοιτητές μεταξύ τους, εντός και εκτός του Διαδικτύου. Πιο συγκεκριμένα, διερευνήθηκαν οι σκέψεις και η ευαισθησία τους ως προς την προβληματική χρήση του Διαδικτύου, οι αντιλήψεις τους για τη δυσκολία τους να αναγνωρίσουν και να εκφράσουν λεκτικά τα συναισθήματά τους, καθώς και οι αντιλήψεις τους για το βαθμό στον οποίο αυτοαποκαλύπτονταν στους καλύτερούς τους φίλους. Όλα αυτά εξετάστηκαν σε δύο διαφορετικές συνθήκες, την επικοινωνία μέσω του κοινωνικού δικτύου Facebook και την επικοινωνία σε καφετέρια. Το δείγμα της έρευνας αποτέλεσαν 760 άτομα, γυναίκες και άντρες φοιτητές. Η συλλογή των δεδομένων έγινε μέσω Διαδικτύου και για την επεξεργασία τους πραγματοποιήθηκαν ποικίλες στατιστικές αναλύσεις. Από τα αποτελέσματα φάνηκε ότι η πλειοψηφία των συμμετεχόντων δεν είχε τάση για προβληματική χρήση του Διαδικτύου. Ακόμη, διαπιστώθηκε ότι σε αντίθεση με την επικοινωνία μέσω του Διαδικτύου, η επικοινωνία δια ζώσης προτιμάται και αποτελεί ένα πλαίσιο καλύτερης αναγνώρισης και επικοινωνίας συναισθημάτων και προσωπικών πληροφοριών. Διαφυλικές διαφορές εντοπίστηκαν επίσης, ως προς όλες τις μεταβλητές και συνθήκες της έρευνας. Η συζήτηση των αποτελεσμάτων έγινε αναλυτικά, σε συνδυασμό με τα κοινά και τα αντίθετα ευρήματα άλλων ερευνών.
description: The current study investigated the communication between college students, through the Internet and face-to-face. Specifically, their thoughts and their sensitivity to the Problematic Internet Use were examined, as well as their difficulty to recognize and express their feelings verbally and also the degree of their self-disclosure towards their best friends was investigated. All of these were tested in the following two different conditions: communication through the social network Facebook and communication at a cafe. The sample consisted of 760 Greek, women and men, university students. The data were collected through the Internet and for their examination various statistical analyses were performed. The results showed that for the majority of the participants no tendency towards Problematic Internet Use was found. Furthermore, it was evident that the face-to-face communication was preferred to the communication through the Internet, as the former seemed to be a better framework for recognition of emotions and self-disclosure. Differences among women and men were found, in respect to all variables and conditions of this research. The results are discussed meticulously and in comparison to common and opposite findings of other researches.
Triggered massive-star formation on the borders of Galactic HII regions. IV- Star formation at the periphery of Sh2-212
Creators: name: Deharveng, L.
name: Lefloch, B.
name: Kurtz, S.
name: Nadeau, D.
name: Pomarès, M.
name: Caplan, J.
name: Zavagno, A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Aims: We wish to establish whether sequential star formation is taking place at the periphery of the Galactic HII region Sh2-212. Methods: We present CO millimetre observations of this region obtained at the IRAM 30-m telescope to investigate the distribution of associated molecular material. We also use deep JHK observations obtained at the CFHT to study the stellar content of the region, and radio observations obtained at the VLA to look for the presence of an ultra-compact (UC) HII region and for maser emission. Results: In the optical, Sh2-212 is spherically symmetric around its central exciting cluster. This HII region is located along a molecular filament. A thin, well-defined half ring of molecular material surrounds the brightest part of the HII region at the rear and is fragmented. The most massive fragment (~200 solar masses) contains a massive young stellar object displaying a near-IR excess; its spectral energy distribution indicates a high-mass (~14solar masses), high-temperature (~30000K), and high-luminosity (~17000 solar luminosities) source. This object ionizes a UC HII region. Conclusions: Sh2-212 is a good example of massive-star formation triggered via the collect and collapse process. The massive YSO observed at its periphery is a good candidate for a massive star formed in isolation.
description: 12 pages, 14 figures. To be published in A&A