cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Magnetic Charge Lattices, Moduli Spaces and Fusion Rules
Creators: name: Kampmeijer, L.
name: Slingerland, J. K.
name: Schroers, B. J.
name: Bais, F. A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We analyze the set of magnetic charges carried by smooth BPS monopoles in Yang-Mills-Higgs theory with arbitrary gauge group G spontaneously broken to a subgroup H. The charges are restricted by a generalized Dirac quantization condition and by an inequality due to Murray. Geometrically, the set of allowed charges is a solid cone in the coroot lattice of G, which we call the Murray cone. We argue that magnetic charge sectors correspond to points in the Murray cone divided by the Weyl group of H; hence magnetic charge sectors are labelled by dominant integral weights of the dual group H*. We define generators of the Murray cone modulo Weyl group, and interpret the monopoles in the associated magnetic charge sectors as basic; monopoles in sectors with decomposable charges are interpreted as composite configurations. This interpretation is supported by the dimensionality of the moduli spaces associated to the magnetic charges and by classical fusion properties for smooth monopoles in particular cases. Throughout the paper we compare our findings with corresponding results for singular monopoles recently obtained by Kapustin and Witten.
description: 53 pages, 6 figures
Singlino-dominated dark matter in general NMSSM
Creators: name: Cao, Junjie
name: Li, Demin
name: Lian, Jingwei
name: Yue, Yuanfang
name: Zhou, Haijing
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The general Next-to-Minimal Supersymmetric Standard Model (NMSSM) describes the singlino-dominated dark-matter (DM) property by four independent parameters: singlet-doublet Higgs coupling coefficient $λ$, Higgsino mass $μ_{tot}$, DM mass $m_{\tildeχ_1^0}$, and singlet Higgs self-coupling coefficient $κ$. The first three parameters strongly influence the DM-nucleon scattering rate, while $κ$ usually affects the scattering only slightly. This characteristic implies that singlet-dominated particles may form a secluded DM sector. Under such a theoretical structure, the DM achieves the correct abundance by annihilating into a pair of singlet-dominated Higgs bosons by adjusting $κ$'s value. Its scattering with nucleons is suppressed when $λv/μ_{tot}$ is small. This speculation is verified by sophisticated scanning of the theory's parameter space with various experiment constraints considered. In addition, the Bayesian evidence of the general NMSSM and that of $Z_3$-NMSSM is computed. It is found that, at the cost of introducing one additional parameter, the former is approximately $3.3 \times 10^3$ times the latter. This result corresponds to Jeffrey's scale of 8.05 and implies that the considered experiments strongly prefer the general NMSSM to the $Z_3$-NMSSM.
description: 29 pages, 9 figures
MPEC 2024-C93 : DAILY ORBIT UPDATE (2024 February 9)
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2024
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.
Anisotropic current-induced spin accumulation in the two-dimensional electron gas with spin-orbit coupling
Creators: name: Trushin, Maxim
name: Schliemann, John
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We investigate the magnetoelectric (or inverse spin-galvanic) effect in the two dimensional electron gases with both Rashba and Dresselhaus spin-orbit coupling using an exact solution of the Boltzmann equation for electron spin and momentum. The spin response to an in-plane electric field turns out to be highly anisotropic while the usual charge conductivity remains isotropic, contrary to earlier statements.
description: extended version of the previous submission: 6 pages, 1 fig
Tuning Hole Mobility, Concentration, and Repulsion in High-$T_c$ Cuprates via Apical Atoms
Creators: name: Yin, Wei-Guo
name: Ku, Wei
Publisher: name: arXiv
Year: 2007
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Using a newly developed first-principles Wannier-states approach that takes into account large on-site Coulomb repulsion, we derive the effective low-energy interacting Hamiltonians for several prototypical high-$T_c$ superconducting cuprates. The material dependence is found to originate primarily from the different energy of the apical atom $p_z$ state. Specifically, the general properties of the low-energy hole state, namely the Zhang-Rice singlet, are significantly modified by a triplet state associated with this $p_z$ state, via additional intra-sublattice hoppings, nearest-neighbor "super-repulsion", and other microscopic many-body processes. Possible implications on modulation of $T_c$, local superconducting gaps, charge distribution, hole mobility, electron-phonon interaction, and multi-layer effects are discussed.
description: 5 pages, 3 figures, 1 table
Scaling of Small-Scale Dynamo Properties in the Rayleigh-Taylor Instability
Creators: name: Skoutnev, Valentin
name: Most, Elias R.
name: Bhattacharjee, Amitava
name: Philippov, Alexander A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: We derive scaling relations based on free-fall and isotropy assumptions for the kinematic small-scale dynamo growth rate and amplification factor over the course of the mixing, saturation, and decay phases of the Rayleigh-Taylor instability (RTI) in a fully-ionized plasma. The scaling relations are tested using sets of three dimensional, visco-resistive MHD simulations of the RTI and found to hold in the saturation phase, but exhibit discrepancies during the mixing and decays phases, suggesting a need to relax either the free-fall or isotropy assumptions. Application of the scaling relations allows for quantitative prediction of the net amplification of magnetic energy in the kinematic dynamo phase and therefore a determination of whether the magnetic energy either remains sub-equipartition at all velocity scales or reaches equipartition with at least some scales of the turbulent kinetic energy in laboratory and astrophysical scenarios. As an example, we consider the dynamo in RTI-unstable regions of the outer envelope of a binary neutron star merger and predict that the kinematic regime of the small-scale dynamo ends on the time scale of nanoseconds and then reaches saturation on a timescale of microseconds, which are both fast compared to the millisecond relaxation time of the post-merger.
Gas stripping in galaxy groups - the case of the starburst spiral NGC 2276
Creators: name: Rasmussen, Jesper
name: Ponman, Trevor J.
name: Mulchaey, John S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Ram pressure stripping of galactic gas is generally assumed to be inefficient in galaxy groups due to the relatively low density of the intragroup medium and the small velocity dispersions of groups. To test this assumption, we obtained Chandra X-ray data of the starbursting spiral NGC 2276 in the NGC 2300 group of galaxies, a candidate for a strong galaxy interaction with hot intragroup gas. The data reveal a shock-like feature along the western edge of the galaxy and a low-surface-brightness tail extending to the east, similar to the morphology seen in other wavebands. Spatially resolved spectroscopy shows that the data are consistent with intragroup gas being pressurized at the leading western edge of NGC 2276 due to the galaxy moving supersonically through the intragroup medium at a velocity ~850 km/s. Detailed modelling of the gravitational potential of NGC 2276 shows that the resulting ram-pressure could significantly affect the morphology of the outer gas disc but is probably insufficient to strip large amounts of cold gas from the disc. We estimate the mass loss rates due to turbulent viscous stripping and starburst outflows being swept back by ram pressure, showing that both mechanisms could plausibly explain the presence of the X-ray tail. Comparison to existing HI measurements shows that most of the gas escaping the galaxy is in a hot phase. With a total mass loss rate of roughly 5 M_Sun/yr, the galaxy could be losing its entire present HI supply within a Gyr. This demonstrates that the removal of galactic gas through interactions with a hot intragroup medium can occur rapidly enough to transform the morphology of galaxies in groups. Implications of this for galaxy evolution in groups and clusters are briefly discussed.
description: 16 pages, 8 figures, accepted for publication in MNRAS
Symmetry protected topological edge modes and emergent partial time reversal symmetry breaking in open quantum many-body systems
Creators: name: Wang, Zijian
name: Li, Qiaoyi
name: Li, Wei
name: Cai, Zi
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Symmetry-protected topological edge modes are one of the most remarkable phenomena in topological physics. Here, we formulate and quantitatively examine the effect of a quantum bath on these topological edge modes. Using the density matrix renormalization group method, we study the ground state of a composite system of spin-1 quantum chain, where the system and the bath degrees of freedom are treated on the same footing. We focus on the dependence of these edge modes on the global/partial symmetries of system-bath coupling and on the features of the quantum bath. It is shown that the time-reversal symmetry(TRS) plays a special role for an open quantum system, where an emergent partial TRS breaking will result in a TRS-protected topological mode diffusing from the system edge into the bath, thus make it useless for quantum computation.
description: accepted by Phys.Rev.Lett
First-order Formalism and Odd-derivative Actions
Creators: name: Deser, S.
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: In this pedagogical note, we discuss obstacles to the usual Palatini formulations of gauge and gravity theories in presence of odd-derivative order, Chern-Simons, terms.
description: 4 pages. Dedicated to Rafael Sorkin on his 60th Birthday
Graduate recitals
Creators: name: McKittrick, J. Cameron
Publisher: name: University of British Columbia
Year: 2009

description: The loss of personal meaning is explored by analogy through manipulation of the relationship between musical content and its possible interpretations. Recognized musical signals are used out of context. Weightless signals are used in absolutely rigid and unified structures. These approaches were brought to the stage before a live audience in a single recital on March 6, 1994.
Η “ολλανδική ασθένεια” της Ελλάδας
Creators: name: Κανταρτοπούλου, Μαρία Δημητρίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Ολλανδική Ασθένεια
Πετρέλαιο
Ανάπτυξη Ελλάδας
DutchDisease
Oil
Development of Greece

description: Η εργασία αναλύει το πρόβλημα της επιδείνωσης του βιομηχανικού τομέα της Ολλανδίας, ως παράδοξο αποτέλεσμα της ραγδαίας αύξησης εξαγωγών πετρελαίου και φυσικού αερίου, γνωστό και ως “ολλανδική ασθένεια”. Η εκμετάλλευση φυσικών πόρων ξεκίνησε από τις αρχές της δεκαετίας του 1960, ενώ τα αρνητικά αποτελέσματα στην οικονομία άρχισαν να διαχέονται στα τέλη της δεκαετίας του 1970. Αναλύοντας τα βασικά μεγέθη της οικονομίας της Ολλανδίας που επηρεάστηκαν δυσμενώς από την εξόρυξη πετρελαίου και φυσικού αερίου, καταλήγουμε στο συμπέρασμα πως η μονομερής εκμετάλλευση ενός κλάδου επιδρά αρνητικά σε μακροπρόθεσμο επίπεδο στη συνολική οικονομία μίας χώρας.Στην περίπτωση της Ελλάδας, οι κλάδοι που αναπτύχθηκαν μονομερώς φαίνεται πως ήταν οι κλάδοι του τουρισμού και της ναυτιλίας, που σε συνδυασμό με την παραμερισμό του βιομηχανικού κλάδου και τις πολιτικές υποτίμησης της δραχμής, οδηγούν σε επιδείνωση του ισοζυγίου πληρωμών της χώρας. Ο τουρισμός και η ναυτιλία, όμως, παρουσιάζουν ορισμένες ιδιαιτερότητες σε σχέση με τον δευτερογενή τομέα και συνεπώς δεν μπορούν σε καμία περίπτωση να στηρίξουν εξ’ ολοκλήρου το σύνολο της οικονομίας. Τέλος, παρουσιάζουμε τις προοπτικές που έχει η Ελλάδα στον τομέα της εξόρυξης πετρελαίου και φυσικού αερίου και ορισμένα ζητήματα που προκύπτουν και οδηγούμαστε στο συμπέρασμα πως η Ελλάδα πλέον είναι σε θέση να αναπτύξει αυτόν τον τομέα, αλλά να πραγματοποιηθεί σταδιακά και να μη γίνει μονομερής εστίαση για να αποφευχθούν όλες οι συνέπειες της “ολλανδικής ασθένειας”
description: The paper analyzes the problem of the deterioration of the Dutch industrial sector as a paradoxical result of the rapid increase in oil and gas exports, also known as "Dutch disease". The exploitation of natural resources began in the early 1960s, while the negative effects on the economy began to diffuse in the late 1970s. Analyzing the key figures of the Dutch economy adversely affected by oil and gas extraction, we come to conclusion that the unilateral exploitation of one sector adversely affects the long-term level in the overall economy of a country. In the case of Greece, the sectors that developed unilaterally seemed to be the tourism and shipping sectors, which, coupled with the depreciation of the industry and the drachma devaluation policies, have led to a worsening of the country's balance of payments. Tourism and shipping, however, have some peculiarities in relation to the secondary sector and therefore cannot under any circumstances support the entire economy. Finally, we present the prospects that Greece has in the field of oil and gas extraction and some issues that arise and we conclude that Greece is now in a position to develop this sector, but to take place gradually and not to have a unilateral focus on to avoid all the consequences of "Dutch disease"
Επτάνησος Πολιτεία: η οργάνωση και η κοινωνία της κατά το Σύνταγμα του 1803
Creators: name: Δαγκλή, Ελένη Αστερίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Επτάνησος Πολιτεία
Σύνταγμα 1803
Κοινωνία των Επτανήσων
Septinsular Republic
Constitution of 1803
Society of Ionian islands

description: Η παρούσα διπλωματική εργασία πραγματεύεται το Σύνταγμα του 1803, το οποίο αποτελεί ένα εκ των τριών Συνταγμάτων της Επτανήσου Πολιτείας (1800-1807). Στο πρώτο κεφάλαιο γίνεται μία σύντομη παρουσίαση των συνθηκών που επικρατούσαν κατά τη θέσπιση του πρώτου Συντάγματος της Επτανήσου Πολιτείας, μαζί με μία συνοπτική παρουσίαση του. Στην συνέχεια εξετάζονται οι διεθνείς εξελίξεις, αλλά και οι εσωτερικές κοινωνικές συγκρούσεις και αναταραχές, και πως αυτές οδήγησαν στη θέσπιση του Συντάγματος του 1803. Στο δεύτερο κεφάλαιο εξετάζεται λεπτομερώς το ίδιο το Σύνταγμα. Αρχικά παρουσιάζονται τα νέα κρατικά όργανα (Νομοθετικό Σώμα, Τιμητεία, Γερουσία, Δικαστική αρχή και Επαρχεία). Μετά μελετώνται οι καινοτομίες που εισάγει σε σύγκριση με το προηγούμενο Σύνταγμα του 1800 (κατάργηση ομοσπονδιακού συστήματος, αντικατάσταση της αριστοκρατικής με την “συνταγματική” ευγένεια, κατοχύρωση ατομικών δικαιωμάτων και δημόσιας εκπαίδευσης). Στην συνέχεια εξετάζεται η μορφή του νέου πολιτεύματος που θεσπίζει το συγκεκριμένο Σύνταγμα, και κατά πόσο αυτό είναι δημοκρατικό και φιλελεύθερο. Τελικώς, με αφορμή το χαρακτηρισμό του, συγκρίνεται το Σύνταγμα του 1803 με το Σύνταγμα του Ρήγα Βελεστινλή του 1797. Στο τρίτο κεφάλαιο εξετάζεται η αναθεώρηση που υπέστη το 1806 και οι γενεσιουργές αιτίες αυτής. H παρούσα εργασία κλείνει με μία παράθεση των απόψεων που έχουν εκφράσει διακεκριμένοι μελετητές για το Σύνταγμα του 1803
description: This master’s thesis deals with the Constitution of 1803, which is one of the three Constitutions of the Septinsular Republic (1800-1807). In chapter one, there is a brief analysis of the social conditions during this era, together with a brief presentation of the 1st Constitution of 1800. There is also a detailed analysis of the international developments, as well as a description of the internal social conflicts and unrest and how these conflicts led to the adoption of the Constitution of 1803. In chapter two, there is an extensive analysis of the 2nd Constitution of 1803. Initially, there is a presentation of the new state institutions (Legislative Body, Timiteia, Senate, Judicial Authority and Provinces). Afterwards, there is a presentation with the innovations introduced in comparison with the previous Constitution of 1800 (the abolition of the federal system, the replacement of aristocratic with "constitutional" nobility, the enforcement of individual rights and public education). The form of the new state is examined, and whether it is democratic and liberal. Finally, the Constitution of 1803 is compared to the Constitution of Riga Velestinlis of 1797. In chapter three, there is a review of the 3rd Constitution of 1806, which is considered a constitutional review of the 2nd Constitution of 1803. The present master’s thesis ends with the views expressed by distinguished scholars on the 1803 Constitution
A 0535+26 in the August/September 2005 outburst observed by RXTE and INTEGRAL
Creators: name: Caballero, I.
name: Kretschmar, P.
name: Santangelo, A.
name: Staubert, R.
name: Klochkov, D.
name: Camero, A.
name: Ferrigno, C.
name: Finger, M. H.
name: Kreykenbohm, I.
name: McBride, V. A.
name: Pottschmidt, K.
name: Rothschild, R. E.
name: Schoenherr, G.
name: Segreto, A.
name: Suchy, S.
name: Wilms, J .
name: Wilson, C. A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: In this Letter we present results from INTEGRAL and RXTE observations of the spectral and timing behavior of the High Mass X-ray Binary A 0535+26 during its August/September 2005 normal (type I) outburst with an average flux F(5-100keV)~400mCrab. The search for cyclotron resonance scattering features (fundamental and harmonic) is one major focus of the paper. Our analysis is based on data from INTEGRAL and RXTE Target of Opportunity Observations performed during the outburst. The pulse period is determined. X-ray pulse profiles in different energy ranges are analyzed. The broad band INTEGRAL and RXTE pulse phase averaged X-ray spectra are studied. The evolution of the fundamental cyclotron line at different luminosities is analyzed. The pulse period P is measured to be 103.39315(5)s at MJD 53614.5137. Two absorption features are detected in the phase averaged spectra at E_1~45keV and E_2~100keV. These can be interpreted as the fundamental cyclotron resonance scattering feature and its first harmonic and therefore the magnetic field can be estimated to be B~4x10^12G.
description: 4 pages, 5 figures, accepted for publication in A&A Letters
High field fractional quantum Hall effect in optical lattices
Creators: name: Palmer, R. N.
name: Jaksch, D.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We consider interacting bosonic atoms in an optical lattice subject to a large simulated magnetic field. We develop a model similar to a bilayer fractional quantum Hall system valid near simple rational numbers of magnetic flux quanta per lattice cell. Then we calculate its ground state, magnetic lengths, fractional fillings, and find unexpected sign changes in the Hall current. Finally we study methods for detecting these novel features via shot noise and Hall current measurements.
description: 4 pages, 4 figures, accepted by PRL
Generalized strong curvature singularities and weak cosmic censorship in cosmological space-times
Creators: name: Rudnicki, W.
name: Budzynski, R. J.
name: Kondracki, W.
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: This paper is a further development of the approach to weak cosmic censorship proposed by the authors in Ref. 5. We state and prove a modified version of that work's main result under significantly relaxed assumptions on the asymptotic structure of space--time. The result, which imposes strong constraints on the occurrence of naked singularities of the strong curvature type, is in particular applicable to physically realistic cosmological models.
description: Latex, 7 pages, no figures, to be published in Mod. Phys. Lett. A
[Fried typed elicitation notes]
Creators: name: Kulikauskas, Rima
name: Fried, Mirjam
name: Hubbard, Kathleen
Publisher: name: California Language Archive, University of California, Berkeley
Year: 2024
Subjects: subject: lit

description: Typed elicitation notes parimarily from sessions led by Mirjam Fried, with contributions by Kathleen Hubbard on two pages.
Από τον Άνθρωπο στον Μετα-άνθρωπο: Σύγχρονοι Βιοηθικοί Προβληματισμοί
Creators: name: Τσαλαφούτα, Νικολέττα Χρήστου
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Διανθρωπισμός
Βιοηθική
Ενισχυτικές τεχνολογίες
Transhumanism
Bioethics
Enhancing technologies

description: Τους δύο τελευταίους αιώνες, αναπτύσσονται ολοένα και πιο σύνθετες τεχνολογικές εφαρμογές, βελτιώνοντας την ποιότητα ζωής του ανθρώπου. Αυτές οι ραγδαίες εξελίξεις της επιστήμης έχουν επαναφέρει στο προσκήνιο την έννοια της αυτοβελτίωσης. Η τελευταία, παίρνοντας πια το όνομα ενίσχυση, αποτελεί μείζον ζήτημα αντιπαράθεσης τόσο σε θεωρητικό (εφαρμοσμένη ηθική) όσο και σε πρακτικό επίπεδο (ιατρική επιστήμη, βιολογία, γενετική κ.α). Στόχος του παρόντος πονήματος είναι να παρουσιάσει την θεωρία του Διανθρωπισμού, δηλαδή την προσπάθεια ενίσχυσης/βελτίωσης του ανθρώπινου όντος με την χρήση της σύγχρονης τεχνολογίας, υπό ιατρικής, φιλοσοφικής και βιοηθικής σκοπιάς
description: Over the two past centuries, increasingly complex technological applications have been developing, improving the quality of human life. These rapid advances in science have brought back to the fore the concept of self-improvement. The latter, now called enhancement, is a major issue of debate on a theoretical (applied ethics) as well as a practical (medical science, biology, genetics, etc.) level. The aim of this essay is to present the theory of Transhumanism, i.e. the attempt to enhance/ameliorate the human being using modern technology, from a medical, philosophical and bioethical point of view
Bending the Bruhat-Tits Tree I:Tensor Network and Emergent Einstein Equations
Creators: name: Chen, Lin
name: Liu, Xirong
name: Hung, Ling-Yan
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Mathematical Physics (math-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: As an extended companion paper to [1], we elaborate in detail how the tensor network construction of a p-adic CFT encodes geometric information of a dual geometry even as we deform the CFT away from the fixed point by finding a way to assign distances to the tensor network. In fact we demonstrate that a unique (up to normalizations) emergent graph Einstein equation is satisfied by the geometric data encoded in the tensor network, and the graph Einstein tensor automatically recovers the known proposal in the mathematics literature, at least perturbatively order by order in the deformation away from the pure Bruhat-Tits Tree geometry dual to pure CFTs. Once the dust settles, it becomes apparent that the assigned distance indeed corresponds to some Fisher metric between quantum states encoding expectation values of bulk fields in one higher dimension. This is perhaps a first quantitative demonstration that a concrete Einstein equation can be extracted directly from the tensor network, albeit in the simplified setting of the p-adic AdS/CFT.
description: 34 pages,4 figures
Latent Space Refinement for Deep Generative Models
Creators: name: Winterhalder, Ramon
name: Bellagente, Marco
name: Nachman, Benjamin
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (stat.ML)
subject: Machine Learning (cs.LG)
subject: High Energy Physics - Experiment (hep-ex)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: Deep generative models are becoming widely used across science and industry for a variety of purposes. A common challenge is achieving a precise implicit or explicit representation of the data probability density. Recent proposals have suggested using classifier weights to refine the learned density of deep generative models. We extend this idea to all types of generative models and show how latent space refinement via iterated generative modeling can circumvent topological obstructions and improve precision. This methodology also applies to cases were the target model is non-differentiable and has many internal latent dimensions which must be marginalized over before refinement. We demonstrate our Latent Space Refinement (LaSeR) protocol on a variety of examples, focusing on the combinations of Normalizing Flows and Generative Adversarial Networks.
description: 15 pages, 5 figures, 3 tables
A class of non-fillable contact structures
Creators: name: Presas, Francisco
Publisher: name: arXiv
Year: 2006
Subjects: subject: Symplectic Geometry (math.SG)
subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 57R17; 53D10

description: A geometric obstruction, the so called "plastikstufe", for a contact structure to not being fillable has been found by K. Niederkruger. This generalizes somehow the concept of overtwisted structure to dimensions higher than 3. This paper elaborates on the theory showing a big number of closed contact manifolds with a "plastikstufe". They are the first examples of non-fillable contact closed high-dimensional manifolds. In particular we show that $S^3 \times \prod_j Σ_{j}$, for $g(Σ_j)\geq 2$, possesses this kind of contact structure and so any connected sum with those manifolds also does it.
description: 19 pages, 4 figures
Quantum computing models for artificial neural networks
Creators: name: Mangini, Stefano
name: Tacchino, Francesco
name: Gerace, Dario
name: Bajoni, Daniele
name: Macchiavello, Chiara
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Neural networks are computing models that have been leading progress in Machine Learning (ML) and Artificial Intelligence (AI) applications. In parallel, the first small scale quantum computing devices have become available in recent years, paving the way for the development of a new paradigm in information processing. Here we give an overview of the most recent proposals aimed at bringing together these ongoing revolutions, and particularly at implementing the key functionalities of artificial neural networks on quantum architectures. We highlight the exciting perspectives in this context and discuss the potential role of near term quantum hardware in the quest for quantum machine learning advantage.
description: Pre-submission manuscript, see DOI for the final version
EL USO DE TWITTER PARA ANALIZAR LAS PROPUESTAS CIUDADANAS: LAS NOTICIAS ECONÓMICAS DE LOS PRINCIPALES PERIÓDICOS DE REFERENCIA NACIONA
Creators: name: Soria Ibáñez, María del Mar
Publisher: name: Zenodo
Year: 2024

description: Twitter se ha convertido en el principal medio de expresiónciudadana y plataforma sobre la que generar una nueva forma de hacerPeriodismo. En el caso español, las portadas de referencia nacional y suscontenidos en el microblogging generan un tráfico de conversaciones quees el fiel reflejo de un contexto social y político marcado por la crisiseconómica. Por ello, este estudio tiene como fin reflejar el grado de parti-cipación ciudadana sobre los contenidos informativos en Twitter, partien-do de la cuantificación de sus interacciones o del tono de sus menstajes.El análisis de contenido que presenta este trabajo radiografía el uso quehacen los principales periódicos españoles del nuevo medio social, seña-la la importancia que otorga la ciudadanía a las noticias vertidas por lassecciones de economía y revela cuáles son las publicaciones más activasen el microblogging y, por lo tanto, las más populares. Palabras clave:Ciudadanía; Twitter; prensa; economía; crisis económica; desempleo
Poset algebras over well quasi-ordered posets
Creators: name: Abraham, Uri
name: Bonnet, Robert
name: Kubis, Wieslaw
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Topology (math.GN)
subject: Logic (math.LO)
subject: FOS: Mathematics
subject: 03G05, 06A06 (Primary) 06E05, 08A05, 54G12 (Secondary)

description: A new class of partial order-types, class $\gbqo^+$ is defined and investigated here. A poset $P$ is in the class $W^+ $ iff the free poset algebra $F(P)$ is generated by a better quasi-order $G$ that is included in the free lattice $L(P)$. We prove that if $P$ is any well quasi-ordering, then $L(P)$ is well founded, and is a countable union of well quasi-orderings. We prove that the class $W^+$ is contained in the class of well quasi-ordered sets. We prove that $W^+$ is preserved under homomorphic image, finite products, and lexicographic sum over better quasi-ordered index sets. We prove also that every countable well quasi-ordered set is in $W^+$. We do not know, however if the class of well quasi-ordered sets is contained in $W^+$. Additional results concern homomorphic images of posets algebras.
description: 28 pages
Η λογοκρισία στην Τέχνη. Περιπτώσεις λογοκρισίας στη μεταπολεμική ελληνική τέχνη
Creators: name: Τσίχλα, Μαρκέλλα-Ελπίδα Ευστρατίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Λογοκρισία
Μεταπολεμική ελληνική τέχνη
Ελεύθερη έκφραση
Censorship
Post-war Greek art
Free expression

description: Σκοπός της μεταπτυχιακής διπλωματικής εργασίας είναι να μελετηθεί το φαινόμενο της λογοκρισίας στην τέχνη και να αναλυθούν οι περιπτώσεις λογοκρισίας στη μεταπολεμική ελληνική τέχνη. Αρχικά εξετάζονται κάποια θεωρητικά ζητήματα του φαινομένου της λογοκρισίας, ενώ έχοντας ως γνώμονα την ερμηνεία του φαινομένου σε ένα ευρύτερο πλαίσιο, πραγματοποιήθηκε ένα χρονικό λογοκρισίας στη διεθνή τέχνη αλλά και στις υπόλοιπες μορφές τέχνης στην Ελλάδα. Ακόμη αναλύθηκε το θεωρητικό πλαίσιο βάσει του οποίου ερμηνεύτηκαν τα λογοκριτικά περιστατικά και η μεθοδολογία που ακολουθήθηκε. Τα περιστατικά λογοκρισίας που αποτέλεσαν αντικείμενο έρευνας της συγκεκριμένης διπλωματικής εργασίας, επιλέχτηκε να εξεταστούν θεματικά δηλαδή να κατηγοριοποιηθούν με βάση το αίτιο και το κίνητρο που τα προκάλεσαν, εντάσσοντάς τα σε συγκεκριμένο κοινωνικοιστορικό πλαίσιο. Ως προς την εμφάνιση της λογοκρισίας στις εικαστικές τέχνες, αυτή εντοπίζεται με τη μορφή απαγορεύσεων, αποκαθηλώσεων, βανδαλισμών, αποκλεισμών και δικαστικών αγώνων, ενώ τα κίνητρα που προκαλούν τα λογοκριτικά περιστατικά είναι ενδεικτικά του αξιακού συστήματος της κοινωνίας
description: The aim of my postgraduate dissertation is to study the phenomenon of censorship in art and to analyze censorship in post-war Greek art. Initially, some theoretical issues of censorship phenomenon, have been considered. Secondly while having in mind the interpretation of the phenomenon of censorship in a wider context, a chronicle of censorship has been done in international art as well as in other art forms in Greece. Also the theoretical context is analyzed and the methodology which was followed. The censorship cases that have been the subject of this dissertation were selected to be thematically examined, ie to be categorized according to the cause and motivation that caused them, integrating them into a particular socio-historical context. As to the appearance of censorship in the visual arts, it is identified in the form of bans, detentions, vandalism, exclusions and litigation, while the motives of censorship are indicative of the value system of society
Η αξιοποίηση του εικονικού μουσείου στο Μάθημα των Θρησκευτικών: Μια πρόταση διδασκαλίας
Creators: name: Γκιούρα, Χρυσούλα Νικολάου
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: εικονικό μουσείο
διδακτική Θρησκευτικών
μαθησιακή δραστηριότητα
virtual museum
religious teaching
learning activity

description: Η παρούσα μεταπτυχιακή εργασία μελετά το θεωρητικό πλαίσιο της εκπαιδευτικής αξιοποίησης ενός εικονικού μουσείου. Περιγράφεται η μελέτη και η ανάπτυξη ενός εικονικού μουσείου στο ΜτΘ στην Πρωτοβάθμια Εκπαίδευση για βελτιστοποίηση της ποιότητας της εκπαιδευτικής διαδικασίας. Το εικονικό μουσείο έχει τίτλο: «Το μουσείο της Παναγίας» και λειτουργεί ως μια εναλλακτική διδακτική πρόταση, συνδέοντας τα ελκυστικά περιβάλλοντα μάθησης, που προσφέρουν οι Τεχνολογίες Πληροφοριών και Επικοινωνίας (ΤΠΕ), με τις άτυπες μορφές μάθησης, όπως της μουσειακής αγωγής. Η εφαρμογή αποτελεί πρακτική ενσυναίσθησης του θρησκευτικού και ιστορικού «γίγνεσθαι», καθώς οι μαθητές/τριες με πολυαισθητηριακές ευκαιρίες και ανοιχτές αλληλεπιδραστικές δραστηριότητες ταξιδεύουν στον χωροχρόνο και ταυτόχρονα ένα «όχημα πολλαπλών σπουδών» στην ανακάλυψη της γνώσης σε συνδυασμό με τα μαθησιακά οφέλη που αντλούν οι μαθητές/τριες από την αλληλεπίδρασή τους με αυτό
description: This dissertation focuses on the theoretical framework of the educational exploitation of a virtual museum. It describes the study and development of a virtual museum in the subject of Religious Education in Primary Schools in order to optimize the quality of the educational process. The virtual museum is titled "The Virgin Mary Museum" and acts as an alternative teaching suggestion, linking the attractive learning environments, offered by Information and Communication Technologies (ICT), with informal forms of learning, such as museum education. The application is a practice of empathy of religious and historical "becoming", as students with multi-sensory opportunities and open interactive activities travel in space-time and at the same time a "multidisciplinary vehicle" in the discovery of knowledge combined with the learning benefits which pupils draw from their interaction with it
Electronic structure of edge and vortex states in chiral mesoscopic superconductor
Creators: name: Silaev, M. A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We study a subgap quasiparticle spectrum in a mesoscopic disk of chiral superconductor. We find an exact expression for the spectrum of surface states localized at the disk edge. Considering an Abrikosov vortex placed at the center of a superconducting disk we investigate the spectrum transformation near the intersection points of surface and vortex anomalous energy branches . The resulting splitting of the anomalous branches due to the hybridization of edge and vortex states is determined by an external magnetic field and can lead in particular to the formation of a set of minigaps in the quasiparticle spectrum. Tuning the external magnetic field makes it possible to control the width of minigaps and the positions of corresponding density of states singularities at the minigaps edges.
description: 6 pages, 2 figures
Planners and planning for climate change : an examination of sea level rise issues for coastal settlements
Creators: name: Moore, Janet Linda
Publisher: name: University of British Columbia
Year: 2009

description: This thesis focuses on the planning problems of anticipated increases in average global seas levels for coastal and island communities throughout the world. The combination of global warming repercussions, increasing population growth, and the evolution of megacities are discussed in the context of sustainable development in communities affected by rising sea levels. Inherent in these discussions are the related planning, political, and economic issues of equity and security of local, national, and international dimensions. Several country profiles are included from both the developed and less-developed nations to illustrate the similarities and differences among in their challenges and opportunities to deal effectively with global climate change. It is argued that planners should act as "enablers", and that planning as a function of society has a specific responsibility to educate and prepare "the public" for global climate changes and sea level rise. The role of planning is discussed in the context of uncertainty in risk assessment, gaps in knowledge, constraints to planning, decision-making strategies, and coastal zone management in general. An overview of global, national, and local trends and preliminary actions taken to date are presented. It is argued that transitional measures and better decision-making strategies are required in planning, government policy development, future research, and education in order that all societies may move, more equitably, toward creating a sustainable future.
Towards monitoring ecosystem integrity within the Post-2020 Global Biodiversity Framework preprint
Creators: name: Hansen, Andrew
name: B. Noble
name: Jaris Veneros
name: East, Alyson
name: Goetz, Scott J.
name: Supples, Christina
name: Watson, James E.M.
name: Jantz, Patrick
name: Pillay, Rajeev
name: Jetz, Walter
name: Ferrier, Simon
name: Grantham, Hedley S.
name: Evans, Thomas D.
name: Ervin, Jamison
name: Venter, Oscar
name: Virnig, Anne
Publisher: name: figshare
Year: 2021
Subjects: subject: 50202 Conservation and Biodiversity
subject: FOS: Biological sciences
subject: Ecology
subject: 50206 Environmental Monitoring
subject: FOS: Earth and related environmental sciences

description: We offer a framework for monitoring Ecological Integrity in the context of the Post-2020 Global Biodiversity Framework.
Sedimentation and Type I X-ray Bursts at Low Accretion Rates
Creators: name: Peng, Fang
name: Brown, Edward F.
name: Truran, James W.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Neutron stars, with their strong surface gravity, have interestingly short timescales for the sedimentation of heavy elements. Motivated by observations of Type I X-ray bursts from sources with extremely low persistent accretion luminosities, $L_X < 10^{36}\usp\ergspersecond (\simeq 0.01\ensuremath{L_{\mathrm{Edd}}}$), we study how sedimentation affects the distribution of isotopes and the ignition of H and He in the envelope of an accreting neutron star. For local mass accretion rates $\mdot \lesssim 10^{-2}\medd$ (for which the ignition of H is unstable), where $\medd = 8.8\times 10^{4}\nsp\gpscps$, the helium and CNO elements sediment out of the accreted fuel before reaching a temperature where H would ignite. Using one-zone calculations of the thermonuclear burning, we find a range of accretion rates for which the unstable H ignition does not trigger unstable He burning. This range depends on the emergent flux from reactions in the deep neutron star crust; for $F = 0.1\nsp\MeV(\dot{m}/\mb)$, the range is $3\times 10^{-3}\medd\lesssim\mdot\lesssim 10^{-2}\medd$. We speculate that sources accreting in this range will build up a massive He layer that later produces an energetic and long X-ray burst. At mass accretion rates lower than this range, we find that the H flash leads to a strong mixed H/He flash. Surprisingly, even at accretion rates $\mdot \gtrsim 0.1\medd$, although the H and He do not completely segregate, the H abundance at the base of the accumulated layer is still reduced. While following the evolution of the X-ray burst is beyond the scope of this introductory paper, we note that the reduced proton-to-seed ratio favors the production of \iso{12}{C}--an important ingredient for subsequent superbursts.
description: 15 pages, 14 figures, submitted to ApJ, revised version
Συμβολικές αναπαραστάσεις των παιδιών με προβλήματα υγείας στις παραδοσιακές κοινωνίες μέσα από τα λαϊκά παραμύθια και τις λαϊκές παραδόσεις
Creators: name: Θεοδωρίδου, Θεοδοσία Δημητρίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2018
Subjects: Λαϊκές παραδόσεις
Λαϊκά παραμύθια
Συμβολικές αναπαραστάσεις
Symbolic representations
Folktales
Legends

description: Πρωταρχικός σκοπός της παρούσας εργασίας υπήρξε η απάντηση στο επιστημονικό ερώτημα «με ποιο τρόπο αναπαριστώνται συμβολικά τα παιδιά με διάφορα προβλήματα υγείας στις παραδοσιακές κοινωνίες». Οι πληροφορίες για τις παραδοσιακές αντιλήψεις αντλούνται κυρίως από τα λαϊκά παραμύθια και τις λαϊκές παραδόσεις. Από την γκάμα των λαϊκών παραμυθιών επιλέγονται αυτά που πραγματεύονται το θέμα των υπερφυσικών συζύγων, ενώ από την πληθώρα των λαϊκών παραδόσεων ιδιαίτερη έμφαση δίνεται στις ιστορίες για τα αλλαγμένα παιδιά. Επιπλέον, διερευνώνται οι πρακτικές αντιμετώπισης των παράξενων, για την εποχή, γεννήσεων καθώς και η ευθύνη της μητέρας όταν γεννούσε ένα παιδί που απέκκλινε από το φυσιολογικό. Στη συνέχεια, εντοπίζονται ομοιότητες ανάμεσα σε μια παραδοσιακή κοινωνία και σε μια σύγχρονη κοινωνία του Τρίτου Κόσμου, οι οποίες αφορούν στη στάση των μητέρων απέναντι στα άρρωστα βρέφη τους. Βασικό ζητούμενο είναι να αναρωτηθούμε, ως επαγγελματίες της ψυχικής υγείας, εάν συναντάμε σε γονείς και εκπαιδευτικούς με τους οποίους συνεργαζόμαστε κάποιες από τις αντιλήψεις που καταδεικνύει η παρούσα μελέτη. Τέλος, η μελέτη αυτή αναμένεται να αποτελέσει ένα πλαίσιο ανάδειξης ορισμένων λαίκών παραμυθιών και παραδόσεων, με σκοπό να χρησιμοποιηθεί ως εργαλείο στη δουλειά μας με τα μικρά παιδιά και τους γονείς τους
description: The primary objective of this research has been to provide an answer to the scientific question of what is the symbolic way that the children with various health problems are represented in the traditional societies. In order for this question to be answered, information is drawn by studying the traditional beliefs in folktales and legends. From the range of folktales, those that deal with the subject of supernatural spouses are chosen, while from the plethora of folk traditions, particular emphasis is placed on the stories of the “changelings”. In addition, the practices of dealing with strange at-this-time births are investigated as well as the maternal responsibility when giving birth to a child that deviated from normal. Additionally, the similarities between a traditional society and a modern Third World society are identified, similarities tending to be related to the attitude of mothers towards their sick infants. The basic point is to ask ourselves, as mental health professionals, if some of the perceptions demonstrated in this study are met between parents and educators with whom we work together. Finally, this study is expected to provide a framework for the promotion of some folktales and traditions in order for them to be used as a tool in our work with young children and their parents
Resonant spin amplification in Faraday geometry
Creators: name: Schering, P.
name: Evers, E.
name: Nedelea, V.
name: Smirnov, D. S.
name: Zhukov, E. A.
name: Yakovlev, D. R.
name: Bayer, M.
name: Uhrig, G. S.
name: Greilich, A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We demonstrate the realization of the resonant spin amplification (RSA) effect in Faraday geometry where a magnetic field is applied parallel to the optically induced spin polarization so that no RSA is expected. However, model considerations predict that it can be realized for a central spin interacting with a fluctuating spin environment. As a demonstrator, we choose an ensemble of singly-charged (In,Ga)As/GaAs quantum dots, where the resident electron spins interact with the surrounding nuclear spins. The observation of RSA in Faraday geometry requires intense pump pulses with a high repetition rate and can be enhanced by means of the spin-inertia effect. Potentially, it provides the most direct and reliable tool to measure the longitudinal $g$ factor of the charge carriers.
description: 7 pages including 4 figures; 8 pages supplement including 4 figures
Probing the sp^2 dependence of elastic moduli in ultrahard diamond films
Creators: name: Fyta, Maria
name: Hadjisavvas, G. C.
name: Kelires, P. C.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: The structural and elastic properties of diamond nanocomposites and ultrananocrystalline diamond films (UNCD) are investigated using both empirical potentials and tight binding schemes. We find that both materials are extremely hard, but their superb diamondlike properties are limited by their sp^2 component. In diamond composites, the sp^2 atoms are found in the matrix and far from the interface with the inclusion, and they are responsible for the softening of the material. In UNCD, the sp^2 atoms are located in the grain boundaries. They offer relaxation mechanisms which relieve the strain but, on the other hand, impose deformations that lead to softening. The higher the sp^2 component the less rigid these materials are.
description: 10 pages, 3 figures. to appear in Diamond and Relarted Materials
Braneworld stars and black holes
Creators: name: Creek, Simon
name: Gregory, Ruth
name: Kanti, Panagiota
name: Mistry, Bina
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: FOS: Physical sciences

description: We look for spherically symmetric star or black hole solutions on a Randall-Sundrum brane from the perspective of the bulk. We take a known bulk solution, and analyse possible braneworld trajectories within it that correspond, from the braneworld point of view, to solutions of the brane Tolman-Oppenheimer-Volkoff equations. Our solutions are therefore embedded consistently into a full bulk solution. We find the full set of static gravitating matter sources on a brane in a range of bulk spacetimes, analyzing which can correspond to physically sensible sources. Finally, we look at time-dependent trajectories in a Schwarzschild--anti de Sitter spacetime as possible descriptions of time-dependent braneworld black holes, highlighting some of the general features one might expect, as well as some of the difficulties involved in getting a full solution to the question.
description: 39 pages, 15 figures