cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
QCD Coulomb gauge approach to hybrid mesons
Creators: name: General, Ignacio J.
name: Cotanch, Stephen R.
name: Llanes-Estrada, Felipe J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: An effective Coulomb gauge Hamiltonian, H_eff, is used to calculate the light (u-ubar-g), strange (s-sbar-g) and charmed (c-cbar-g) hybrid meson spectra. For the same two parameter H_eff providing glueball masses consistent with lattice results and a good description of the observed u,d,s and c quark mesons, a large-scale variational treatment predicts the lightest hybrid has J^{PC}=0^{++} and mass 2100 MeV. The lightest exotic 1^{-+} state is just above 2200 MeV, near the upper limit of lattice and Flux Tube predictions. These theoretical formulations all indicate the observed 1^{-+} pi_1(1600) and, more clearly, pi_1(1400) are not hybrid states. The Coulomb gauge approach further predicts that in the strange and charmed sectors, respectively, the ground state hybrids have 1^{+-} with masses 2125 and 3830 MeV, while the first exotic 1^{-+} states are at 2395 and 4020 MeV. Finally, using our hybrid wavefunctions, dimensional counting rules and the Franck-Condon principle, novel experimental signatures are presented to assist light and heavy hybrid meson searches.
description: 13 pages, 10 figures. Two figures corrected
Three-body description of $^9$C: Role of low-lying resonances in breakup reactions
Creators: name: Singh, Jagjit
name: Matsumoto, Takuma
name: Fukui, Tokuro
name: Ogata, Kazuyuki
Publisher: name: arXiv
Year: 2021
Subjects: subject: Nuclear Theory (nucl-th)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: The $^9$C nucleus and related capture reaction, ${^8\mathrm{B}}(p,γ){^9\mathrm{C}}$, have been intensively studied with an astrophysical interest. Due to the weakly-bound nature of $^9$C, its structure is likely to be described as the three-body (${^7\mathrm{Be}}+p+p$). Its continuum structure is also important to describe reaction processes of $^9$C, with which the reaction rate of the ${^8\mathrm{B}}(p,γ){^9\mathrm{C}}$ process have been extracted indirectly. We perform three-body calculations on $^9$C and discuss properties of its ground and low-lying states via breakup reactions. We employ the three-body model of $^9$C using the Gaussian-expansion method combined with the complex-scaling method. This model is implemented in the four-body version of the continuum-discretized coupled-channels method, by which breakup reactions of $^9$C are studied. The intrinsic spin of $^7$Be is disregarded. By tuning a three-body interaction in the Hamiltonian of $^9$C, we obtain the low-lying $2^+$ state with the resonant energy 0.781 MeV and the decay width 0.137 MeV, which is consistent with the available experimental information and a relatively high-lying second $2^+$ wider resonant state. Our calculation predicts also sole $0^+$ and three $1^-$ resonant states. We discuss the role of these resonances in the elastic breakup cross section of $^9$C on $^{208}$Pb at 65 and 160 MeV/A. The low-lying 2$^+$ state is probed as a sharp peak of the breakup cross section, while the 1$^-$ states enhance the cross section around 3 MeV. Our calculations will further support the future and ongoing experimental campaigns for extracting astrophysical information and evaluating the two-proton removal cross-sections.
description: 8 pages, 4 figures, 2 tables (final published version)
Continuum tree asymptotics of discrete fragmentations and applications to phylogenetic models
Creators: name: Haas, Bénédicte
name: Miermont, Grégory
name: Pitman, Jim
name: Winkel, Matthias
Publisher: name: arXiv
Year: 2006
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 60J80 (Primary)

description: Given any regularly varying dislocation measure, we identify a natural self-similar fragmentation tree as scaling limit of discrete fragmentation trees with unit edge lengths. As an application, we obtain continuum random tree limits of Aldous's beta-splitting models and Ford's alpha models for phylogenetic trees. This confirms in a strong way that the whole trees grow at the same speed as the mean height of a randomly chosen leaf.
description: Published in at http://dx.doi.org/10.1214/07-AOP377 the Annals of Probability (http://www.imstat.org/aop/) by the Institute of Mathematical Statistics (http://www.imstat.org)
Extensions of C*-dynamical systems to systems with complete transfer operators
Creators: name: Kwaśniewski, B. K.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Operator Algebras (math.OA)
subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics
subject: 46L55, 46L30

description: Starting from an arbitrary endomorphism $α$ of a unital C*-algebra $A$ we construct a bigger C*-algebra $B$ and extend $α$ onto $B$ in such a way that the extended endomorphism $α$ has a unital kernel and a hereditary range, i.e. there exists a unique non-degenerate transfer operator for $(B,α)$, called the complete transfer operator. The pair $(B,α)$ is universal with respect to a suitable notion of a covariant representation and depends on a choice of an ideal in $A$. The construction enables a natural definition of the crossed product for arbitrary $α$.
description: Compressed and submitted version, 9 pages
Proactive and AoI-aware Failure Recovery for Stateful NFV-enabled Zero-Touch 6G Networks: Model-Free DRL Approach
Creators: name: Shaghaghi, Amirhossein
name: Zakeri, Abolfazl
name: Mokari, Nader
name: Javan, Mohammad Reza
name: Behdadfar, Mohammad
name: Jorswieck, Eduard A
Publisher: name: arXiv
Year: 2021
Subjects: subject: Signal Processing (eess.SP)
subject: Machine Learning (cs.LG)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: In this paper, we propose a Zero-Touch, deep reinforcement learning (DRL)-based Proactive Failure Recovery framework called ZT-PFR for stateful network function virtualization (NFV)-enabled networks. To this end, we formulate a resource-efficient optimization problem minimizing the network cost function including resource cost and wrong decision penalty. As a solution, we propose state-of-the-art DRL-based methods such as soft-actor-critic (SAC) and proximal-policy-optimization (PPO). In addition, to train and test our DRL agents, we propose a novel impending-failure model. Moreover, to keep network status information at an acceptable freshness level for appropriate decision-making, we apply the concept of age of information to strike a balance between the event and scheduling based monitoring. Several key systems and DRL algorithm design insights for ZT-PFR are drawn from our analysis and simulation results. For example, we use a hybrid neural network, consisting long short-term memory layers in the DRL agents structure, to capture impending-failures time dependency.
description: Accepted by IEEE TNSM for publication Code is available in https://github.com/wildsky95/ZT-PFR
An observational testbed for cosmological zoom-in simulations: constraining stellar migration in the solar cylinder using asteroseismology
Creators: name: Verma, Kuldeep
name: Grand, Robert J. J.
name: Aguirre, Víctor Silva
name: Stokholm, Amalie
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Large-scale stellar surveys coupled with recent developments in magneto-hydrodynamical simulations of the formation of Milky Way-mass galaxies provide an unparalleled opportunity to unveil the physical processes driving the evolution of the Galaxy. We developed a framework to compare a variety of parameters with their corresponding predictions from simulations in an unbiased manner, taking into account the selection function of a stellar survey. We applied this framework to a sample of over 7000 stars with asteroseismic, spectroscopic, and astrometric data available, together with 6 simulations from the Auriga project. We found that some simulations are able to produce abundance dichotomies in the $[{\rm Fe}/{\rm H}]-[α/{\rm Fe}]$ plane which look qualitatively similar to observations. The peak of their velocity distributions match the observed data reasonably well, however they predict hotter kinematics in terms of the tails of the distributions and the vertical velocity dispersion. Assuming our simulation sample is representative of Milky Way-like galaxies, we put upper limits of 2.21 and 3.70 kpc on radial migration for young ($< 4$ Gyr) and old ($\in [4, 8]$ Gyr) stellar populations in the solar cylinder. Comparison between the observed and simulated metallicity dispersion as a function of age further constrains migration to about 1.97 and 2.91 kpc for the young and old populations. These results demonstrate the power of our technique to compare numerical simulations with high-dimensional datasets, and paves the way for using the wider field TESS asteroseismic data together with the future generations of simulations to constrain the subgrid models for turbulence, star formation and feedback processes.
description: 19 pages, 18 figures (including 8 in the appendix), 1 table, MNRAS in press
Probing Compensated Isocurvature with the 21-cm Signal during Cosmic Dawn
Creators: name: Hotinli, Selim C.
name: Binnie, Thomas
name: Muñoz, Julian B.
name: Dinda, Bikash R.
name: Kamionkowski, Marc
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Upcoming measurements of the 21-cm line of neutral hydrogen will open a new observational window into the early stages of structure growth, providing a unique opportunity for probing large-scale cosmological signatures using the small-scale signals from the first stars. In this paper we evaluate the detection significance of compensated isocurvature perturbations (CIPs) from observations of the 21-cm hydrogen-line during the cosmic-dawn era. CIPs are modulations of the relative baryon and dark-matter density that leave the total matter density unchanged. We find that, under different assumptions for feedback and foregrounds, the ongoing HERA and upcoming SKA1-low experiments will provide constraints on uncorrelated CIPs at the level of $σ(A_{\rm CIP})= 10^{-3}-10^{-4}$, comparable to the sensitivity of upcoming CMB experiments, and potentially exceeding the constraints from cosmic-variance limited BAO surveys.
description: 13 pages, 5 figures, comments welcome
Defect production in non-linear quench across a quantum critical point
Creators: name: Sen, Diptiman
name: Sengupta, K.
name: Mondal, Shreyoshi
Publisher: name: arXiv
Year: 2008
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We show that the defect density $n$, for a slow non-linear power-law quench with a rate $τ^{-1}$ and an exponent $α>0$, which takes the system through a critical point characterized by correlation length and dynamical critical exponents $ν$ and $z$, scales as $n \sim τ^{-ανd/ (αzν+1)}$ [$n \sim (αg^{(α-1)/α}/τ)^{νd/(zν+1)}$], if the quench takes the system across the critical point at time $t=0$ [$t=t_0 \ne 0$], where $g$ is a non-universal constant and $d$ is the system dimension. These scaling laws constitute the first theoretical results for defect production in non-linear quenches across quantum critical points and reproduce their well-known counterpart for linear quench ($α=1$) as a special case. We supplement our results with numerical studies of well-known models and suggest experiments to test our theory.
description: Final version; Accepted for publication in Physical Review Letters
Kairón and Chronos: The Reintegration of Subjective Time in the XChronos Model
Creators: name: Silva, Jaconaazar
Publisher: name: Zenodo
Year: 2025
Subjects: subject: Kairós
subject: Chronos
subject: Subjective Time
subject: XChronos
subject: Hexa
subject: Phenomenology
subject: Ontological Idealism
subject: Synchronicity
subject: Symbolic Currency
subject: Crônons
subject: Philosophy
subject: FOS: Philosophy, ethics and religion
subject: Metaphysics
subject: Alternative Economics
subject: Human Consciousness
subject: Symbolic Systems

description: This paper proposes a philosophical integration between the ancient Greek concepts of Kairós (qualitative, meaningful time) and Chronos (chronological, mechanical time), based on the symbolic framework of the XChronos model. Through the incorporation of crônons, hexacrônons, and the symbolic currency Hexa (ɗ), the study explores the revaluation of subjective time as a source of experiential wealth. The article draws from Nadir Chagas Ribeiro dos Santos’ (2015) essay and aims to reinsert presence, meaning, and synchronicity into the human experience.
Two-neutron knockout from neutron-deficient $^{34}$Ar, $^{30}$S, and $^{26}$Si
Creators: name: Yoneda, K.
name: Obertelli, A.
name: Gade, A.
name: Bazin, D.
name: Brown, B. A.
name: Campbell, C. M.
name: Cook, J. M.
name: Cottle, P. D.
name: Davies, A. D.
name: Dinca, D. -C.
name: Glasmacher, T.
name: Hansen, P. G.
name: Hoagland, T.
name: Kemper, K. W.
name: Lecouey, J. -L.
name: Mueller, W. F.
name: Reynolds, R. R.
name: Terry, J. R.
name: Tostevin, J. A.
name: Zwahlen, H.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: Two-neutron knockout reactions from nuclei in the proximity of the proton dripline have been studied using intermediate-energy beams of neutron-deficient $^{34}$Ar, $^{30}$S, and $^{26}$Si. The inclusive cross sections, and also the partial cross sections for the population of individual bound final states of the $^{32}$Ar, $^{28}$S and $^{24}$Si knockout residues, have been determined using the combination of particle and $γ$-ray spectroscopy. Similar to the two-proton knockout mechanism on the neutron-rich side of the nuclear chart, these two-neutron removal reactions from already neutron-deficient nuclei are also shown to be consistent with a direct reaction mechanism.
description: Phys. Rev. C, rapid communication, in press
Breakup of a Long-Period Comet as the Origin of the Dinosaur Extinction
Creators: name: Siraj, Amir
name: Loeb, Abraham
Publisher: name: arXiv
Year: 2021
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: The origin of the Chicxulub impactor, which is attributed as the cause of the K/T mass extinction event, is an unsolved puzzle. The background impact rates of main-belt asteroids and long-period comets have been previously dismissed as being too low to explain the Chicxulub impact event. Here, we show that a fraction of long-period comets are tidally disrupted after passing close to the Sun, each producing a collection of smaller fragments that cross the orbit of Earth. This population could increase the impact rate of long-period comets capable of producing Chicxulub impact events by an order of magnitude. This new rate would be consistent with the age of the Chicxulub impact crater, thereby providing a satisfactory explanation for the origin of the impactor. Our hypothesis explains the composition of the largest confirmed impact crater in Earth's history as well as the largest one within the last million years. It predicts a larger proportion of impactors with carbonaceous chondritic compositions than would be expected from meteorite falls of main-belt asteroids.
description: 16 pages, 1 figure; published in Scientific Reports
Speciation of arsenicals
Creators: name: Le, Xiao-Chun
Publisher: name: University of British Columbia
Year: 2009

description: Environmentally and biologically important organoarsenicals such as arsenobetaine, arsenocholine, arsenosugars, and the tetramethylarsonium ion do not form volatile hydrides on treatment with sodium borohydride, even though hydride generation is a commonly used analytical technique for arsenic. Consequently, it has been difficult to determine the concentration of these so called "hidden" arsenicals. To this end a method has been developed in which all arsenicals are decomposed completely to arsenate by using microwave oven heated solutions of potassium persulfate and sodium hydroxide. A portable hydride generator is described. Radioactive tracer studies show that fast reactions and high efficiencies (95%) are achieved by using the new generator. A system which combines flow injection analysis, on-line microwave oven digestion, the new hydride generator, and atomic absorption spectrometry (FIA/MD/HGAAS) is developed and shown to be capable of differentiating arsenite, arsenate, monomethylarsonic acid (MMAA), and dimethylarsinic acid (DMAA) from the "hidden" organoarsenic compounds such as arsenobetaine which are usually present in crab, shrimp, and other crustaceans. This system is capable of performing analysis at a sample throughput of 100-120 per hour. Calibration curves are linear from 5 to 200 ng ml⁻¹ of arsenic and the detection limit is 0.5 ng ml⁻¹ for 100 μ1 injection (0.05 ng of arsenic). The system can be coupled to a high performance liquid chromatograph (HPLC) and used as a detector for arsenic speciation studies. An alternative system coupling HPLC to an inductively coupled plasma mass spectrometer (ICPMS) is also investigated for the speciation of arsenicals commonly present in the environmental and biological systems. The analytical methods developed are successfully used to study the arsenicals present in marine animals, seaweeds, and human urine. Following human ingestion of crab and shrimp, which contain arsenobetaine as the major arsenic species, a fast urinary excretion of unchanged arsenobetaine is observed. No difference is found in either the excretion pattern or the excreted arsenic species in the urine of six volunteers who ingested either crab meat or shrimp. In contrast the arsenosugars present in macroalgae are metabolized and have a longer retention in the human body. When nine volunteers ingested a commercial seaweed product Nori, which contains an arsenosugar as the major arsenic species, both the urinary arsenic excretion pattern and the urinary arsenic species excreted varied from individual to individual. The present work also reveals the presence of arsenosugars in addition to arsenobetaine in marine bivalves. These findings shed light on some important aspects of arsenic biogeochemistry including the toxicological implications of the consumption of seaweed, the metabolism of arsenosugars, the biochemical pathway to arsenobetaine, and ultimately the cycling of arsenic in the marine environment.
Algebraic fiber space whose generic fiber and base space are of almost general type
Creators: name: Fukuda, Shigetaka
Publisher: name: arXiv
Year: 2007
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 14E30, 14D06

description: We assume that the existence and termination conjecture for flips holds. A complex projective manifold is said to be {\it of almost general type} if the intersection number of the canonical divisor with every very general curve is strictly positive. Let $f$ be an algebraic fiber space from $X$ to $Y$. Then the manifold $X$ is of almost general type if every very general fiber $F$ and the base space $Y$ of $f$ are of almost general type.
description: 9 pages, LaTeX2e; The final version
Engineering Complex Computational Ecosystems
Creators: name: Pianini, Danilo <1986>
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2015
Subjects: ING-INF/05 Sistemi di elaborazione delle informazioni

description: Self-organising pervasive ecosystems of devices are set to become a major vehicle for delivering infrastructure and end-user services. The inherent complexity of such systems poses new challenges to those who want to dominate it by applying the principles of engineering.

The recent growth in number and distribution of devices with decent computational and communicational abilities, that suddenly accelerated with the massive diffusion of smartphones and tablets, is delivering a world with a much higher density of devices in space. Also, communication technologies seem to be focussing on short-range device-to-device (P2P) interactions, with technologies such as Bluetooth and Near-Field Communication gaining greater adoption.

Locality and situatedness become key to providing the best possible experience to users, and the classic model of a centralised, enormously powerful server gathering and processing data becomes less and less efficient with device density. Accomplishing complex global tasks without a centralised controller responsible of aggregating data, however, is a challenging task. In particular, there is a local-to-global issue that makes the application of engineering principles challenging at least: designing device-local programs that, through interaction, guarantee a certain global service level.

In this thesis, we first analyse the state of the art in coordination systems, then motivate the work by describing the main issues of pre-existing tools and practices and identifying the improvements that would benefit the design of such complex software ecosystems.

The contribution can be divided in three main branches. First, we introduce a novel simulation toolchain for pervasive ecosystems, designed for allowing good expressiveness still retaining high performance. Second, we leverage existing coordination models and patterns in order to create new spatial structures. Third, we introduce a novel language, based on the existing ``Field Calculus'' and integrated with the aforementioned toolchain, designed to be usable for practical aggregate programming.
Identification of Sagittarius stream members in Angular Momentum space with Gaussian mixture techniques
Creators: name: Peñarrubia, Jorge
name: Petersen, Michael S.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: This paper uses Gaussian mixture techniques to dissect the Milky Way (MW) stellar halo in angular momentum space. Application to a catalogue of 5389 stars near the plane of the Sagittarius (Sgr) stream with full 6D phase-space coordinates supplied by Gaia EDR3 and SEGUE returns four independent dynamical components. The broadest and most populated corresponds to the `smooth' MW halo. The narrowest and faintest contains 40 stars of the Orphan stream. We find a component with little or no angular momentum likely associated with the GSE substructure. We also identify 925 stars and 7 Globular Clusters with probabilities $>90\%$ to be members of the Sgr stream. Comparison against $N$-body models shows that some of these members trace the continuation of the leading/trailing tails in the Southern/Northern hemispheres. The new detections span $\sim 800^\circ$ on the sky, thus wrapping the Galaxy {\it twice}.
description: Submitted to MNRAS Letters. Comments welcome
Mapping the Gravitational-wave Sky with LISA: A Bayesian Spherical Harmonic Approach
Creators: name: Banagiri, Sharan
name: Criswell, Alexander
name: Kuan, Tommy
name: Mandic, Vuk
name: Romano, Joseph D.
name: Taylor, Stephen R.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: The millihertz gravitational-wave frequency band is expected to contain a rich symphony of signals with sources ranging from galactic white dwarf binaries to extreme mass ratio inspirals. Many of these gravitational-wave signals will not be individually resolvable. Instead, they will incoherently add to produce stochastic gravitational-wave confusion noise whose frequency content will be governed by the dynamics of the sources. The angular structure of the power of the confusion noise will be modulated by the distribution of the sources across the sky. Measurement of this structure can yield important information about the distribution of sources on galactic and extra-galactic scales, their astrophysics and their evolution over cosmic timescales. Moreover, since the confusion noise is part of the noise budget of LISA, mapping it will also be essential for studying resolvable signals. In this paper, we present a Bayesian algorithm to probe the angular distribution of the stochastic gravitational-wave confusion noise with LISA using a spherical harmonic basis. We develop a technique based on Clebsch-Gordan coefficients to mathematically constrain the spherical harmonics to yield a non-negative distribution, making them optimal for expanding the gravitational-wave power and amenable to Bayesian inference. We demonstrate these techniques using a series of simulations and analyses, including recovery of simulated distributed and localized sources of gravitational-wave power. We also apply this method to map the gravitational-wave foreground from galactic white-dwarfs using a simplified model of the galactic white dwarf distribution.
description: 13 pages, 6 figures
Damping and excitation variations of the solar acoustic modes using LOWL observations
Creators: name: Salabert, D.
name: Jiménez-Reyes, S. J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have used observations made with the helioseismic instrument LOWL collected over $\sim$ 6 years to carry out an independent study of the variations of the p-mode damping and excitation rates with solar activity. We observe significant variations in the mode height, mode width and mode velocity power over a wide range of angular degree values. Their sensitivities to solar activity show clear evidence of frequency dependence, the modes in the frequency range from 2700 and 3300 $μ$Hz showing the largest variations and exhibiting a maximum change centered around 3100 $μ$Hz. As for the mode energy supply rate, it is consistent, at the level of precision of the observations, with a zero change along the solar cycle and over the range of studied frequencies. Moreover, the variations with solar activity of each of these parameters are observed to be more or less $\ell$-independent over the range of studied angular degrees. Our results provide the first in-depth confirmation of the findings obtained from GONG measurements for intermediate angular degrees.
description: 29 pages, 8 figures, Accepted for publication in ApJ
Thermal Fault Detection and Localization Framework for Large Format Batteries
Creators: name: Sattarzadeh, Sara
name: Roy, Tanushree
name: Dey, Satadru
Publisher: name: arXiv
Year: 2021
Subjects: subject: Systems and Control (eess.SY)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Safety against thermal failures is crucial in battery systems. Real-time thermal diagnostics can be a key enabler of such safer batteries. Thermal fault diagnostics in large format pouch or prismatic cells pose additional challenges compared to cylindrical cells. These challenges arise from the fact that the temperature distribution in large format cells is at least two-dimensional in nature (along length and breadth) while such distribution can be reasonably approximated in one dimension (along radial direction) in cylindrical cells. This difference makes the placement of temperature sensor(s) non-trivial and the design of detection algorithm challenging. In this work, we address these issues by proposing a framework that (i) optimizes the sensor locations to improve detectability and isolability of thermal faults, and (ii) designs a filtering scheme for fault detection and localization based on a two-dimensional thermal model. The proposed framework is illustrated by experimental and simulation studies on a commercial battery cell.
Conditions for nonexistence of static or stationary, Einstein-Maxwell, non-inheriting black-holes
Creators: name: Tod, Paul
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We consider asymptotically-flat, static and stationary solutions of the Einstein equations representing Einstein-Maxwell space-times in which the Maxwell field is not constant along the Killing vector defining stationarity, so that the symmetry of the space-time is not inherited by the electromagnetic field. We find that static degenerate black hole solutions are not possible and, subject to stronger assumptions, nor are static, non-degenerate or stationary black holes. We describe the possibilities if the stronger assumptions are relaxed.
description: 19 pages, to appear in GERG
Οι σχέσεις των εκπαιδευτικών με τους μαθητές σύμφωνα με το έργο σύγχρονων Αγιορειτών Αγίων (Πορφυρίου Καυσοκαλυβίτη και Παϊσίου Αγιορείτη)
Creators: name: Σαρησάββας, Κωνσταντίνος Βασίλειου
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: Σχέσεις
Εκπαιδευτικοί
Μαθητές
Relations
Teachers
Students

description: Η παρούσα μελέτη επιχειρεί να διερευνήσει τις σχέσεις που πρέπει να συνδέουν τους εκπαιδευτικούς με τους μαθητές, σύμφωνα με τα όσα έχουν πει και έχουν γράψει δύο σύγχρονοι Αγιορείτες Άγιοι, ο Πορφύριος Καυσοκαλυβίτης και ο Παΐσιος ο Αγιορείτης. Στο πρώτο κεφάλαιο, περιγράφονται συνοπτικά οι βίοι των δύο Αγίων, από την ημέρα γέννησής τους μέχρι και το οσιακό τους τέλος. Στο δεύτερο κεφάλαιο, αναφερόμαστε ιδιαίτερα στον ρόλο της Oρθόδοξης χριστιανικής αγωγής, στους σκοπούς που έχει, στον τρόπο σύνδεσής της με το σχολείο, αλλά και στον ρόλο που διαδραματίζουν οι γονείς προς αυτήν την κατεύθυνση. Στο επόμενο κεφάλαιο εισάγεται το πλαίσιο σχέσεων μεταξύ εκπαιδευτικού και μαθητών. Τονίζεται η σπουδαιότητα του εκπαιδευτικού έργου, περιγράφονται οι στόχοι που οφείλει να έχει ο εκπαιδευτικός, αλλά και ο τρόπος επίτευξής τους, καθώς και το πώς μπορεί να λειτουργήσει ο ίδιος ως πρότυπο για τους μαθητές του. Ακόμα περιγράφουμε διεξοδικά τον βασικότατο ρόλο της αγάπης στις σχέσεις μεταξύ δασκάλου και μαθητών. Στο τέταρτο κεφάλαιο της έρευνάς μας γίνεται λόγος για τα παιδαγωγικά μέσα στο έργο του εκπαιδευτικού μέσα από το πρίσμα της ορθόδοξης χριστιανικής αγωγής. Συγκεκριμένα, αναφερόμαστε στην υπακοή και την ελευθερία κατά τη διάρκεια της παιδαγωγικής διαδικασίας, στην αξία του διαλόγου και του διακριτικού επαίνου, στην προσεκτική χρήση τιμωριών και ποινών, ενώ στο τέλος τονίζεται η δύναμη της προσευχής. Η εργασία μας ολοκληρώνεται με την παράθεση συμπερασμάτων.
description: The present study attempts to explore the relationships that teachers need to connect with students, according to what two contemporary Saints of the Holy Mountain have said and written, Porphyrios of Kavsokalyvia and Paisios of Mount Athos. The first chapter briefly describes the lives of the two Saints, from the day of their birth to the final day of their birth. In the second chapter, we are particularly referring to the role of Orthodox Christian education, the goals that it has, how it relates to the school, but also the role that parents play in this direction. The next chapter introduces the framework of teacher-student relationships. The importance of the educational project is emphasized, outlining the goals that the teacher must have and how to achieve them, as well as how he / she can function as a role model for his or her students. We also describe in detail the crucial role of love in the relationships between teacher and student. In the fourth chapter of our research we discuss pedagogical means in the work of the teacher from the perspective of Orthodox Christian education. Specifically, we are referring to obedience and freedom during the pedagogical process, the value of dialogue and discreet praise, the careful use of punishments and punishments, and in the end emphasizes the power of prayer. Our work concludes with conclusions.
Balanced homodyne detection in second-harmonic generation microscopy
Creators: name: Xuan, Loc Le
name: Marquier, François
name: Chauvat, Dominique
name: Brasselet, Sophie
name: Treussart, François
name: Perruchas, Sandrine
name: Tard, Cédric
name: Gacoin, Thierry
name: Roch, Jean-François
Publisher: name: arXiv
Year: 2006
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We demonstrate the association of two-photon nonlinear microscopy with balanced homodyne detection for investigating second harmonic radiation properties at nanoscale dimensions. Variation of the relative phase between second-harmonic and fundamental beams is retrieved, as a function of the absolute orientation of the nonlinear emitters. Sensitivity down to approximately 3.2 photon/s in the spatio-temporal mode of the local oscillator is obtained. This value is high enough to efficiently detect the coherent second-harmonic emission from a single KTiOPO4 crystal of sub-wavelength size.
description: 9 pages to appear in Applied Physics Letters
Διερεύνηση Σχέσεων Λεκτικής Επιθετικότητας και Έλξης σε Στελέχη Εταιρίας μέσω Ανάλυσης Δικτύων
Creators: name: Πέτκου, Βασιλική Αδάμ
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: Λεκτική Επιθετικότητα
Διαπροσωπική Έλξη
Κοινωνικά Δίκτυα
Εργαζόμενοι
Verbal Agressiveness
Interpersonal Attraction
Social Network
Eployee

description: Σκοπός της έρευνας αυτής είναι η διερεύνηση των σχέσεων λεκτικής επιθετικότητας, έλξης και των συνακόλουθων ανεπίσημων δομών που ανακύπτουν από τις σχέσεις μεταξύ των στελεχών μιας επιχείρησης. Εξετάστηκε η ενδεχόμενη αλληλεπίδραση μεταξύ των δομών αυτών καθώς και ενδεχόμενων μη δικτυακών (προσωπικών) παραγόντων (λχ φύλο, κοινωνιο-οικονομική κατάσταση, επίσημη θέση στην εταιρία κλπ) που τις επηρεάζουν. Επιδιώχθηκε η λήψη δικτυακού δείγματος σε μία εταιρία αποτελούμενη από 48 κόμβους, οι οποίοι ρωτήθηκαν με τη χρήση ήδη δοκιμασμένων τυποποιημένων ερωτηματολογίων, για τις σχέσεις λεκτικής επίθεσης και έλξης μεταξύ τους. Για την ερμηνεία των ποσοτικών αποτελεσμάτων έγιναν διερευνητικές συνεντεύξεις. Έγινε υπολογισμός δικτυακών μεταβλητών με κατάλληλο λογισμικό, οι οποίες κατόπιν συσχετίστηκαν με λογισμικό συμβατικής στατιστικής τόσο μεταξύ τους, όσο και με τις μη δικτυακές μεταβλητές, ώστε να ανιχνευθούν ενδεχόμενες σχέσεις. Η ύπαρξη λεκτικής επιθετικότητας εντοπίστηκε στο παρόν δείγμα με βάση τα αποτελέσματα της υπάρχουσας μελέτης. Η θέση στην εταιρία και διάφορα άλλα ατομικά χαρακτηριστικά φάνηκε να σχετίζονται με την άσκηση λεκτικής επίθεσης ή την στοχοποίηση. Με βάση τις τάσεις συμπεριφοράς στους υπό εξέταση παράγοντες, έγινε προσπάθεια εύρεσης διαφόρων κατηγοριών-τυπολογιών στις οποίες θα μπορούσαν να ενταχθούν οι εργαζόμενοι.
description: The purpose of this research is the exploring of the relations of verbal aggressiveness ,interpersonal attraction and the subsequent unofficial structures that arise from the relationships among the executives of a business. The potential interaction between these structures as well as the potential non-network (personal) factors (for instance sex,social – economical situation ,official position in the firm etc) that affect them was examined . The receipt of network sample from a firm consisted of 48 nodes was pursued. With the use of already standardized questionnairies the persons were asked about the relations of verbal aggression and attraction between them. Exploratory interviews took place in order to interpret the quantitative results .Using suitable software ,the network variables were estimated and they were linked to conventional statistic software, so that potential relations are traced. The existence of verbal aggressiveness was identified in the present sample based on the results of this study. The position in the firm and different other personal features appear to be related to the verbal aggressiveness and its targeting .There has been an effort to find different types into which the employees could be integrated based on the behavior tendency of the under examination factors.
Temperature dependence of $ρ$ meson-nucleon coupling constant from the AdS/QCD soft-wall model
Creators: name: Mamedov, Shahin
name: Nasibova, Narmin
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We investigate the dependence of the $ρ$ meson-nucleon coupling constant on the temperature of the medium using the soft-wall model of AdS/QCD. The finite temperature profile functions for the vector and fermion fields are applied to the model having a thermal dilaton field. The interaction Lagrangian in the bulk between these fields is written as in zero temperature case and includes minimal- and magnetic-type interactions. The temperature dependence of the $g_{ρNN}(T)$ coupling constant and its terms are plotted. We observe that the coupling constant and its separate terms become zero at the medium temperature near the Hawking temperature of phase transition.
description: 20 pages, improved English, matched with published version
Αξιολόγηση των μέτρων συνδεσιμότητας δικτύων σε ηλεκτροεγκεφαλογραφήματα
Creators: name: Μεταξοπούλου, Νικολέτα Πέτρου
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: Επιληψία
Δίκτυα συσχέτισης
Πάρκινσον
Epilepsy
Connectivity networks
Parkinson

description: Στην παρούσα διπλωματική εργασία πραγματευόμαστε την αξιολόγηση των μέτρων συνδεσιμότητας σε ηλεκτροεγκεφαλογραφήματα (EEG). Στο πρώτο μέρος της εργασίας γίνεται μία εισαγωγή στα πολύπλοκα δίκτυα και πιο συγκεκριμένα στα δίκτυα συσχέτισης τα οποία προέρχονται από πολυμεταβλητές χρονοσειρές. Στο δεύτερο μέρος αναλύουμε τις μεθόδους που χρησιμοποιήσαμε στα πειράματά μας όπως το GCI, το CGCI, το Cross-correlation και το Partial Cross-correlation, καθώς και επίσης τα μέτρα συνδεσιμότητας του εγκεφάλου Cluster Coefficient, Network Degree, Network Strength. Στο τρίτο κομμάτι της εργασίας αναφέρουμε τις δύο παθογένειες του εγκεφάλου ως προς τις οποίες εξετάζουμε την ευαισθησία των παραπάνω αλγορίθμων, την επιληψία και τη νόσο του Πάρκινσον. Στο τέταρτο μέρος παρουσιάζουμε αναλυτικά τα δεδομένα που χρησιμοποιήθηκαν, τον πειραματικό σχεδιασμό, όπως επίσης τα αποτελέσματα των πειραμάτων που διενεργήσαμε. Τέλος, στο τελευταίο μέρος αναφέρουμε τα συμπεράσματα που προέκυψαν από την παραπάνω μελέτη.
description: In the present thesis we deal with the evaluation of connectivity measures in electroencephalograms (EEGs). The first part of the work introduces the complex networks, and in particular correlation networks that come from multivariable time series. In the second part we analyze the methods we used in our experiments such as GCI, CGCI, Cross-correlation and Partial Cross-correlation as well as brain connectivity measures Cluster Coefficient, Network Degree, Network Strength. In the third part of the paper we discuss the two pathogens of the brain in which we examine the sensitivity of the above algorithms, epilepsy and Parkinson’s disease. In the fourth part we present in detail the data used, the experimental design, such as also the results of our experiments. Finally, in the last section we report the conclusions drawn from the above study.
Fourth-Order Exceptional Points in Correlated Quantum Many-Body Systems
Creators: name: Crippa, Lorenzo
name: Budich, Jan Carl
name: Sangiovanni, Giorgio
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Non-Hermtian (NH) Hamiltonians effectively describing the physics of dissipative systems have become an important tool with applications ranging from classical meta-materials to quantum many-body systems. Exceptional points, the NH counterpart of spectral degeneracies, are among the paramount phenomena unique to the NH realm. While realizations of second-order exceptional points have been reported in a variety of microscopic models, higher-order ones have largely remained elusive in the many-body context, as they in general require fine tuning in high-dimensional parameter spaces. Here, we propose a microscopic model of correlated fermions in three spatial dimensions and demonstrate the occurrence of interaction-induced fourth-order exceptional points that are protected by chiral symmetry. We demonstrate their stability against symmetry breaking perturbations and investigate their characteristic analytical and topological properties.
description: 6 pages, 4 figures
Machine Learning Strategies to Handle Medical Data. A comparison between popular ML models using Python
Creators: name: Σερσέμης, Αθανάσιος Κωνσταντίνου
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: Python
Machine Learning
Diabetes
Πάιθον
Μηχανική μάθηση
Διαβήτης

description: Machine Learning is a rising technique of Programming that allows computers to learn like a human brain. Nowadays, most companies and applications take advantages of these techniques in order to efficiently improve their products or services. Machine Learning can be used nearly in all sections that a company has to predict patterns and evaluate their strategies. For example, Machine Learning models are used on both in analysis and classification of user preferences and on cyber security for internet transactions by recognizing scam behaviors. In the Diploma Thesis, that consists of two parts, popular Machine Learning Models were chosen in order to compare them in a try to find the most accurate and the most efficient of them. In the First Part, Part A, the chosen models are explained theoretically and the advantages and the disadvantages of each technique. In the Second Part, Part B, the algorithms which have been used are given for every method, in Python Language using the libraries and the packages that needed in each case. The used data set belongs to Kaggle.
description: Η Τεχνική Μάθηση είναι μία ανερχόμενη μορφή προγραμματισμού η οποία δίνει τη δυνατότητα στον Ηλεκτρονικό Υπολογιστή να μάθει όπως ο ανθρώπινος εγκέφαλος. Τα τελευταία χρόνια, πλήθος εφαρμογών και εταιριών εκμεταλλεύονται τις δυνατότητες που προσφέρουν τα μοντέλα της μεθόδου αυτής, όχι μόνο για να βελτιώσουν τις υπηρεσίες που προσφέρει η εταιρία σε ποιοτικό επίπεδο προϊόντος αλλά σε κάθε πιθανό πρόβλημα που χρειάζεται παρατήρηση, αξιολόγηση και έλεγχο. Οι τεχνικές αυτές μπορούν να εφαρμοστούν για παράδειγμα, τόσο στην κατηγοριοποίηση των προτιμήσεων των πελατών όσο και στην ασφάλεια των συναλλαγών που γίνονται μέσω του διαδικτύου. Σε αυτή τη διπλωματική εργασία, η οποία χωρίζεται σε δύο μέρη, επιλέχθηκαν κάποια δημοφιλή μοντέλα Τεχνικής Μάθησης ώστε να γίνει κάποια σύγκριση μεταξύ τους. Στόχος να διαλευκανθεί αν το θεωρητικό πλαίσιο συμφωνεί με το πειραματικό και να βρεθεί η μέθοδος με τη μεγαλύτερη απόδοση, για το ίδιο πρόβλημα κατηγοριοποίησης. Στο πρώτο μέρος, η παρούσα διπλωματική εργασία, εξηγεί τα γνωστά μοντέλα Τεχνικής Μάθησης που επιλέχθηκαν. Παρουσιάζει το θεωρητικό υπόβαθρο των μοντέλων και περιγράφει τα πλεονεκτήματα και τα μειονεκτήματα του καθενός από αυτά. Στο δεύτερο μέρος, παρουσιάζονται οι εντολές και τα αποτελέσματα της εφαρμογής των τεχνικών αυτών χρησιμοποιώντας το ίδιο σύνολο δεδομένων στην κάθε μία. Γίνεται σύγκριση της αποτελεσματικότητας μεταξύ των μεθόδων ώστε να αναλυθούν τα αποτελέσματα που προέκυψαν σε σχέση με τα αναμενόμενα θεωρητικά. Για το κομμάτι αυτό, χρησιμοποιήθηκε η γλώσσα προγραμματισμού Python και οι βιβλιοθήκες οι οποίες περιέχουν τα απαραίτητα εργαλεία.
description: Σε συνεργασία με: Λογιστικής και Χρηματοοικονομικής (Πανεπιστήμιο Μακεδονίας)
A Dynamic Program for a Team of Two Agents with Nested Information
Creators: name: Dave, Aditya
name: Malikopoulos, Andreas A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optimization and Control (math.OC)
subject: FOS: Mathematics

description: In this paper, we investigate a sequential dynamic team problem consisting of two agents with a nested information structure. We use a combination of the person-by-person and prescription approach to derive structural results for optimal control strategies for the team. We then use these structural results to present a dynamic programming (DP) decomposition to derive the optimal control strategies for a finite time horizon. We show that our DP utilizes the nested information structure to simplify the computation of the optimal control laws for the team at the final time step.
Two Dimensional Ir-Cluster Lattices on Moiré of Graphene with Ir(111)
Creators: name: N'Diaye, Alpha
name: Bleikamp, Sebastian
name: Feibelman, Peter J.
name: Michely, Thomas
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Lattices of Ir clusters have been grown by vapor phase deposition on graphene moirés on Ir(111). The clusters are highly ordered, spatially and thermally stable below 500K. Their narrow size distribution is tunable from 4 to about 130 atoms. A model for cluster binding to the graphene is presented based on scanning tunneling microscopy and density functional theory. The proposed binding mechanism suggests that similar cluster lattices might be grown of materials other than Ir.
description: Submitted to PRL on 27Apr06
OzDES Reverberation Mapping Program: The first Mg II lags from five years of monitoring
Creators: name: Yu, Zhefu
name: Martini, Paul
name: Penton, A.
name: Davis, T. M.
name: Malik, U.
name: Lidman, C.
name: Tucker, B. E.
name: Sharp, R.
name: Kochanek, C. S.
name: Peterson, B. M.
name: Aguena, M.
name: Allam, S.
name: Andrade-Oliveira, F.
name: Annis, J.
name: Asorey, J.
name: Bertin, E.
name: Brooks, D.
name: Burke, D. L.
name: Calcino, J.
name: Rosell, A. Carnero
name: Carollo, D.
name: Kind, M. Carrasco
name: Costanzi, M.
name: da Costa, L. N.
name: Pereira, M. E. S.
name: Diehl, H. T.
name: Everett, S.
name: Ferrero, I.
name: Flaugher, B.
name: Frieman, J.
name: García-Bellido, J.
name: Gaztanaga, E.
name: Gerdes, D. W.
name: Gruen, D.
name: Gruendl, R. A.
name: Gschwend, J.
name: Gutierrez, G.
name: Hinton, S. R.
name: Hollowood, D. L.
name: James, D. J.
name: Kim, A. G.
name: Kron, R.
name: Kuehn, K.
name: Kuropatkin, N.
name: Lewis, G. F.
name: Maia, M. A. G.
name: March, M.
name: Marshall, J. L.
name: Menanteau, F.
name: Miquel, R.
name: Morgan, R.
name: Möller, A.
name: Palmese, A.
name: Paz-Chinchón, F.
name: Plazas, A. A.
name: Sanchez, E.
name: Scarpine, V.
name: Serrano, S.
name: Sevilla-Noarbe, I.
name: Smith, M.
name: Soares-Santos, M.
name: Suchyta, E.
name: Tarle, G.
name: Thomas, D.
name: To, C.
name: Tucker, D. L.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Reverberation mapping is a robust method to measure the masses of supermassive black holes (SMBHs) outside of the local Universe. Measurements of the radius -- luminosity ($R-L$) relation using the Mg II emission line are critical for determining these masses near the peak of quasar activity at $z \approx 1 - 2$, and for calibrating secondary mass estimators based on Mg II that can be applied to large samples with only single-epoch spectroscopy. We present the first nine Mg II lags from our five-year Australian Dark Energy Survey (OzDES) reverberation mapping program, which substantially improves the number and quality of Mg II lag measurements. As the Mg II feature is somewhat blended with iron emission, we model and subtract both the continuum and iron contamination from the multi-epoch spectra before analyzing the Mg II line. We also develop a new method of quantifying correlated spectroscopic calibration errors based on our numerous, contemporaneous observations of F-stars. The lag measurements for seven of our nine sources are consistent with both the H$β$ and Mg II $R-L$ relations reported by previous studies. Our simulations verify the lag reliability of our nine measurements, and we estimate that the median false positive rate of the lag measurements is $4\%$.
description: 18 pages, 12 figures. MNRAS, Volume 507, Issue 3, November 2021, Pages 3771-3788