cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Experimental quantum simulation of superradiant phase transition beyond no-go theorem via antisqueezing
Creators: name: Chen, Xi
name: Wu, Ze
name: Jiang, Min
name: Lv, Xin-You
name: Peng, Xinhua
name: Du, Jiangfeng
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Superradiant phase transition (SPT) in thermal equilibrium, as a fundamental concept bridging the statistical physics and electrodynamics, can offer the key resources for quantum information science. Notwithstanding its fundamental and practical significances, equilibrium SPT has never been observed in experiments since the first proposal in the 1970s. Furthermore, the existence of equilibrium SPT in the cavity quantum electrodynamics (QED) systems is still subject of ongoing debates, due to the no-go theorem induced by the so-called A2 term. Based on the platform of nuclear magnetic resonance (NMR), here we experimentally demonstrate the occurrence of equilibrium SPT beyond no-go theorem by introducing the antisqueezing effect. The mechanism relies on the antisqueezing that recovers the singularity of the ground state via exponentially enhancing the zero point fluctuation (ZPF) of system. The strong entanglement and squeezed Schrodinger cat states of spins are achieved experimentally in the superradiant phase, which may play an important role in fundamental tests of quantum theory, implementing quantum metrology and high-efficient quantum information processing. Our experiment also shows the antisqueezing-enhanced signal-to-noise rate (SNR) of NMR spectrum, providing a general method for implementing high-precision NMR experiments.
description: 9 pages, 4 figures
Balmer-Dominated Shocks Revisited
Creators: name: Heng, Kevin
name: McCray, Richard
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present a new formalism to describe the ratios and profiles of emission lines from hydrogen in Balmer-dominated shocks. We use this model to interpret the measured widths and ratios of broad and narrow H-alpha, H-beta and Ly-alpha emission lines in supernova remnants (SNRs). Our model results agree fairly well with those obtained previously by Chevalier, Kirshner & Raymond (1980) and are consistent with observations of several SNRs. The same model fails to account for the ratio of broad to narrow line emission from the reverse shock in SNR 1987A as observed by Heng et al. (2006). We suggest that this discrepancy between theory and observation results from a faulty assumption that Balmer-dominated shocks can be treated as sharp discontinuities. If the spatial structure of the shock transition zone is taken into account, the predicted ratios of broad to narrow line emission in most SNRs will change by modest factors, but the ratio in SNR 1987A will increase substantially. Significantly greater shock velocities will be required to account for the observed full widths at half-maximum of the broad emission lines in most SNRs.
description: 34 pages, 12 figures. Accepted by ApJ
Probing the Superfluid - Mott Insulating Shell Structure of Cold Atoms by Parametric Excitations
Creators: name: Goren, Lilach
name: Mariani, Eros
name: Stern, Ady
Publisher: name: arXiv
Year: 2006
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: We study the effect of parametric excitations on systems of confined ultracold Bose atoms in periodically modulated optical lattices. In the regime where Mott insulating and Superfluid domains coexist, we show that the dependence of the energy absorbed by the system on the frequency of the modulation serves as an experimental probe for the existence and properties of Mott insulating-Superfluid domains.
description: 4 pages, 1 figure
Thinking with Groundwater from Chennai: Materials, Processes, Experimental Knowledge
Creators: name: Powis, Anthony
Publisher: name: University of Westminster
Year: 2021

description: The (under)ground or (sub)terranean environment is a thick, complex, three-dimensional space of ‘nothing but change’ whose utility is essential to sustaining urban life above it. Living with these grounds is living in conditions of unstable hydrogeological emergence. This thesis looks at the multiple, specific, and contradictory ways in which the materiality of groundwater is understood and intervened in: different knowledges and knowledge practices as ways of knowing groundwater in Chennai, South India. First, I ask what groundwater is, and how I might approach it. Through a series of case studies, I develop a methodology for researching groundwater, confronting the problem of how to research and write something that I cannot access. This means talking to different people who access groundwater in different ways, assembling multiple and contradictory accounts in a way that acknowledges and keeps hold of the intra-active tension between materiality and representation. My means of access are the multiple ways that different people, professions, and institutions get at groundwater, as well my own representational practices as further means of grasping at something always at a distance. Through this I ask, what knowledges exist? How are these different knowledges coproduced, and how are they enacted or re-inscribed through scientific, professional, and everyday practices? How, therefore, can thinking with groundwater from Chennai help to read changing city and changing climate together? The format is processual and iterative: I do not set out to clean up the steps by which research methods, analysis, and theory coevolve. Each chapter is an experiment with ways of knowing groundwater. Throughout these different points of view, it is impossible to say quite what groundwater is, other than a set of relations that move in and between the urban climate. These relations appear and are drawn into focus as registers through which to bring together accounts of diverse phenomena. Instead of as a discernible object, I begin to make sense of groundwater as a relational substance, one which is not background to the city’s ongoing reproduction, but is both substantially altered by and co-constitutive of lively urban assemblages.
Aharonov-Bohm effect on the generalized Duffin-Kemmer-Petiau oscillator in the Som-Raychaudhuri space-time
Creators: name: Yang, Yi
name: Long, Zheng-Wen
name: Chen, Hao
name: Zhao, Zi-Long
name: Long, Chao-Yun
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The generalized Duffin-Kemmer-Petiau (DKP) oscillator with electromagnetic interactions in the curved space-times are investigated. We introduce firstly the generalized DKP oscillator in Som-Raychaudhuri space-time with Cornell potential. Then, we consider the electromagnetic interactions into the generalized DKP oscillator. The energy eigenvalues and eigenfunction of our problem are obtained. The effect from the parameters of space-time, the frequency of oscillator, the Cornell potential and the magnetic flux on the energy eigenvalues have been analyzed. We find a analogs effect for the bound states from the Aharonov-Bohm effect in our considered system.
description: 14 pages, 4 figures
No hair theorems for positive Λ
Creators: name: Bhattacharya, Sourav
name: Lahiri, Amitabha
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We extend all known black hole no-hair theorems to space-times endowed with a positive cosmological constant $Λ.$ Specifically, we prove that static spherical black holes with $Λ>0$ cannot support scalar fields in convex potentials and Proca-massive vector fields in the region between black hole and cosmic horizons. We also demonstrate the existence of at least one type of quantum hair, and of exactly one charged solution for the Abelian Higgs model. Our method of proof can be applied to investigate other types of quantum or topological hair on black holes in the presence of a positive $Λ.$
description: 8pp. v2: added references; comment regarding phantom field, comment that spherical symmetry is not crucial for most of the proof; version published in PRL(name changed in journal)
Finite Size Effects on the Optical Transitions in Quantum Rings under a Magnetic Field
Creators: name: Bandos, Tatyana V.
name: Cantarero, Andres
name: Garcia-Cristobal, Alberto
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: We present a theoretical study of the energy spectrum of single electron and hole states in quantum dots of annular geometry under a high magnetic field along the ring axis in the frame of uncorrelated electron-hole theory. We predict the periodic disappearance of the optical emission of the electron-hole pair as the magnetic field increases, as a consequence of the finite height of the barriers. The model has been applied to semiconductor rings of various internal and external radii, giving as limiting cases the disk and antidot.
description: 22 pages, 7 figures, LaTeX, published in Eur. Phys. J. B 53, 99-108 (2006)
Lissajous curves and semiclassical theory: The two-dimensional harmonic oscillator
Creators: name: Doll, Roland
name: Ingold, Gert-Ludwig
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The semiclassical treatment of the two-dimensional harmonic oscillator provides an instructive example of the relation between classical motion and the quantum mechanical energy spectrum. We extend previous work on the anisotropic oscillator with incommensurate frequencies and the isotropic oscillator to the case with commensurate frequencies for which the Lissajous curves appear as classical periodic orbits. Because of the three different scenarios depending on the ratio of its frequencies, the two-dimensional harmonic oscillator offers a unique way to explicitly analyze the role of symmetries in classical and quantum mechanics.
description: 9 pages, 3 figures; to appear in Am. J. Phys
Typical kernel size and number of sparse random matrices over GF(q) - a statistical physics approach
Creators: name: Alamino, Roberto C.
name: Saad, David
Publisher: name: arXiv
Year: 2008
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Using methods of statistical physics, we study the average number and kernel size of general sparse random matrices over GF(q), with a given connectivity profile, in the thermodynamical limit of large matrices. We introduce a mapping of $GF(q)$ matrices onto spin systems using the representation of the cyclic group of order q as the q-th complex roots of unity. This representation facilitates the derivation of the average kernel size of random matrices using the replica approach, under the replica symmetric ansatz, resulting in saddle point equations for general connectivity distributions. Numerical solutions are then obtained for particular cases by population dynamics. Similar techniques also allow us to obtain an expression for the exact and average number of random matrices for any general connectivity profile. We present numerical results for particular distributions.
description: 16 pages, 3 figures
Magnetoresistivity Modulated Response in Bichromatic Microwave Irradiated Two Dimensional Electron Systems
Creators: name: Inarrea, Jesus
name: Platero, Gloria
Publisher: name: arXiv
Year: 2006
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We analyze the effect of bichromatic microwave irradiation on the magnetoresistivity of a two dimensional electron system. We follow the model of microwave driven Larmor orbits in a regime where two different microwave lights with different frequencies are illuminating the sample ($w_{1}$ and $w_{2}$). Our calculated results demonstrate that now the electronic orbit centers are driven by the superposition of two harmonic oscillatory movements with the frequencies of the microwave sources. As a result the magnetoresisitivity response presents modulated pulses in the amplitude with a frequency of $\frac{w_{1}-w_{2}}{2}$, whereas the main response oscillates with $\frac{w_{1}+w_{2}}{2}$.
description: 4 pages, 3 figures Accepted in Applied Physics Letters
Learning Intents behind Interactions with Knowledge Graph for Recommendation
Creators: name: Wang, Xiang
name: Huang, Tinglin
name: Wang, Dingxian
name: Yuan, Yancheng
name: Liu, Zhenguang
name: He, Xiangnan
name: Chua, Tat-Seng
Publisher: name: arXiv
Year: 2021
Subjects: subject: Information Retrieval (cs.IR)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: Knowledge graph (KG) plays an increasingly important role in recommender systems. A recent technical trend is to develop end-to-end models founded on graph neural networks (GNNs). However, existing GNN-based models are coarse-grained in relational modeling, failing to (1) identify user-item relation at a fine-grained level of intents, and (2) exploit relation dependencies to preserve the semantics of long-range connectivity. In this study, we explore intents behind a user-item interaction by using auxiliary item knowledge, and propose a new model, Knowledge Graph-based Intent Network (KGIN). Technically, we model each intent as an attentive combination of KG relations, encouraging the independence of different intents for better model capability and interpretability. Furthermore, we devise a new information aggregation scheme for GNN, which recursively integrates the relation sequences of long-range connectivity (i.e., relational paths). This scheme allows us to distill useful information about user intents and encode them into the representations of users and items. Experimental results on three benchmark datasets show that, KGIN achieves significant improvements over the state-of-the-art methods like KGAT, KGNN-LS, and CKAN. Further analyses show that KGIN offers interpretable explanations for predictions by identifying influential intents and relational paths. The implementations are available at https://github.com/huangtinglin/Knowledge_Graph_based_Intent_Network.
description: WWW 2021 oral presentation
М. Ягодинська. Слов'янські пам'ятки на Тернопільщині.
Creators: name: Ягодинська, Марина
Publisher: name: figshare
Year: 2025
Subjects: classificationCode: 430101
subject: Archaeological science

description: Археологія і давня історія України, 2020, вип. 2 (35)
Instability of attractors in autoassociative networks with bioinspired fast synaptic noise
Creators: name: Torres, J. J.
name: Cortes, J. M.
name: Marro, J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Neurons and Cognition (q-bio.NC)
subject: FOS: Biological sciences

description: We studied autoassociative networks in which synapses are noisy on a time scale much shorter that the one for the neuron dynamics. In our model a presynaptic noise causes postsynaptic depression as recently observed in neurobiological systems. This results in a nonequilibrium condition in which the network sensitivity to an external stimulus is enhanced. In particular, the fixed points are qualitatively modified, and the system may easily scape from the attractors. As a result, in addition to pattern recognition, the model is useful for class identification and categorization.
description: 6 pages, 2 figures
Accelerating universe emergent from the landscape
Creators: name: She, Jian-Huang
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We propose that the existence of the string landscape suggests the universe can be in a quantum glass state, where an extremely large viscosity is generated, and long distance dynamics slows down. At the same time, the short distance dynamics is not altered due to the separation of time scales. This scenario can help to understand some controversies in cosmology, for example the natural existence of slow roll inflation and dark energy in the landscape, the apparent smallness of the cosmological constant. We see also that moduli stabilization is no longer necessary. We further identify the glass transition point, where the viscosity diverges, as the location of the cosmic horizon. We try to reconstruct the geometry of the accelerating universe from the structure of the landscape, and find that the metric should have an infinite jump when crossing the horizon. We predict that the static coordinate metric for dS space breaks down outside the horizon.
description: 20 pages, no figures, harvmac
Additional file 1 of Traditional Chinese medicine Biqi capsule compared with leflunomide in combination with methotrexate in patients with rheumatoid arthritis: a randomized controlled trial
Creators: name: Wang, Zhang
name: Wu, Jiaqi
name: Li, Dongyun
name: Tang, Xuan
name: Zhao, Yue
name: Cai, Xiao
name: Chen, Xianghong
name: Chen, Xiumin
name: Huang, Qingchun
name: Huang, Runyue
Publisher: name: figshare
Year: 2020
Subjects: subject: Medicine
subject: Cell Biology
subject: Genetics
subject: FOS: Biological sciences
subject: Physiology
subject: Pharmacology
subject: Ecology
subject: Immunology
subject: FOS: Clinical medicine
subject: Biological Sciences not elsewhere classified
subject: Cancer

description: Additional file 1. Patient clinical outcomes for Biqi and LEF treatment arms in the PP analysis.
A re-assessment of strong line metallicity conversions in the machine learning era
Creators: name: Teimoorinia, Hossen
name: Jalilkhany, Mansoureh
name: Scudder, Jillian M.
name: Jensen, Jaclyn
name: Ellison, Sara L.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Strong line metallicity calibrations are widely used to determine the gas phase metallicities of individual HII regions and entire galaxies. Over a decade ago, based on the Sloan Digital Sky Survey Data Release 4 (SDSS DR4), Kewley \& Ellison published the coefficients of third-order polynomials that can be used to convert between different strong line metallicity calibrations for global galaxy spectra. Here, we update the work of Kewley \& Ellison in three ways. First, by using a newer data release (DR7), we approximately double the number of galaxies used in polynomial fits, providing statistically improved polynomial coefficients. Second, we include in the calibration suite five additional metallicity diagnostics that have been proposed in the last decade and were not included by Kewley \& Ellison. Finally, we develop a new machine learning approach for converting between metallicity calibrations. The random forest algorithm is non-parametric and therefore more flexible than polynomial conversions, due to its ability to capture non-linear behaviour in the data. The random forest method yields the same accuracy as the (updated) polynomial conversions, but has the significant advantage that a single model can be applied over a wide range of metallicities, without the need to distinguish upper and lower branches in $R_{23}$ calibrations. The trained random forest is made publicly available for use in the community.
description: 15 pages, 8 figures, 13 tables (MNRAS accepted)
Direct Photons in Heavy-Ion Collisions
Creators: name: Reygers, Klaus
Publisher: name: arXiv
Year: 2006
Subjects: subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: A brief overview of direct-photon measurements in ultra-relativistic nucleus-nucleus collisions is given. The results for Pb+Pb collisions at sqrt{s_NN} = 17.3 GeV and for Au+Au collisions at sqrt{s_NN} = 200 GeV are compared to estimates of the direct-photon yield from hard scattering. Both results leave room for a significant thermal photon component. A description purely based on hard scattering processes, however, is not ruled out so far.
description: 4 pages, 3 figures, to appear in the proceedings of the conference "Quark Confinement and the Hadron Spectrum VII" (QCHS7), Ponta Delgada, 2 - 7 September 2006
Beyond Low-Pass Filters: Adaptive Feature Propagation on Graphs
Creators: name: Li, Sean
name: Kim, Dongwoo
name: Wang, Qing
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Graph neural networks (GNNs) have been extensively studied for prediction tasks on graphs. As pointed out by recent studies, most GNNs assume local homophily, i.e., strong similarities in local neighborhoods. This assumption however limits the generalizability power of GNNs. To address this limitation, we propose a flexible GNN model, which is capable of handling any graphs without being restricted by their underlying homophily. At its core, this model adopts a node attention mechanism based on multiple learnable spectral filters; therefore, the aggregation scheme is learned adaptively for each graph in the spectral domain. We evaluated the proposed model on node classification tasks over eight benchmark datasets. The proposed model is shown to generalize well to both homophilic and heterophilic graphs. Further, it outperforms all state-of-the-art baselines on heterophilic graphs and performs comparably with them on homophilic graphs.
description: 17 pages, 5 figures,conference
Additional file 1 of Severity and outcomes of influenza-related pneumonia in type A and B strains in China, 2013–2019
Creators: name: Chen, Liang
name: Han, Xiu-Di
name: Li, Yan-Li
name: Zhang, Chun-Xiao
name: Xing, Xi-Qian
Publisher: name: figshare
Year: 2020
Subjects: subject: Medicine
subject: Biotechnology
subject: Immunology
subject: FOS: Clinical medicine
subject: Biological Sciences not elsewhere classified
subject: Science Policy
subject: Infectious Diseases
subject: FOS: Health sciences

description: Additional file 1: Appendix 1. Details of participating centers. Appendix 2. Definition of underlying diseases of patients hospitalized with Flu-p in China, 2013–2019. Definition of microbiological criteria of coinfected with other pathogens in patients hospitalized with Flu-p in China, 2013–2019. Appendix 3. Coinfection with other community-acquired pathogens in patients hospitalized with Flu-p in China, 2013–2019. Appendix 4 Univariate analysis on risk factors for 30-day mortality of patients hospitalized with Flu-p in China, 2013–2019.
Chiral O(Q^4) two-body operators for s-wave pion photoproduction on the NN system
Creators: name: Gardestig, A.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The two-body currents for s-wave pion photoproduction on the NN system are derived to O(Q^4) in chiral perturbation theory. For the interesting case of 3S1 1S0 transitions, we show that an axial isovector two-nucleon contact term connects the short-distance physics of pion photoproduction to pion production and several important electroweak reactions. We also find that the standard chiral Lagrangian gives a gamma pi pi N N vertex that have not been explicitly mentioned in previous literature. The corresponding Feynman rule is presented here and some processes where it should be important are briefly discussed.
description: 9 pages, REVTeX, 1 eps figure
Dancing Synchronization in Coupled Spin-Torque Nano-Oscillators
Creators: name: Wu, H. T.
name: Wang, Lei
name: Min, Tai
name: Wang, X. R.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We are reporting a new type of synchronization, termed dancing synchronization, between two spin-torque nano-oscillators (STNOs) coupled through spin waves. Different from the known synchronizations in which two STNOs are locked with various fixed relative phases, in this new synchronized state two STNOs have the same frequency, but their relative phase varies periodically within the common period, resulting in a dynamic waving pattern. The amplitude of the oscillating relative phase depends on the coupling strength of two STNOs, as well as the driven currents. The dancing synchronization turns out to be universal, and can exist in two nonlinear Van der Pol oscillators coupled both reactively and dissipativly. Our findings open doors for new functional STNO-based devices.
Noise invoked resonances near a homoclinic bifurcation in the glow discharge plasma
Creators: name: Nurujjaman, Md.
name: Iyengar, A. N. Sekar
name: Parmananda, Punit
Publisher: name: arXiv
Year: 2008
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: Chaotic Dynamics (nlin.CD)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Physical sciences

description: Stochastic Resonance (SR) and Coherence Resonance (CR) have been studied experimentally in the discharge plasma close to a homoclinic bifurcation. For the SR phenomena, it is observed that a superimposed subthreshold periodic signal can be recovered via stochastic modulations of the discharge voltage. Furthermore, it is realized that even in the absence of a subthreshold deterministic signal, the system dynamics can be recovered and optimized using noise. This effect is defined as CR in the literature. In the present experiments, induction of SR and CR are quantified using the Absolute Mean Difference (AMD) and Normalized Variance (NV) techniques respectively. AMD is a new statistical tool to quantify regularity in the stochastic resonance and is independent of lag.
description: 6 page
Intensity and anisotropies of the stochastic Gravitational Wave background from merging compact binaries in galaxies
Creators: name: Capurri, Giulia
name: Lapi, Andrea
name: Baccigalupi, Carlo
name: Boco, Lumen
name: Scelfo, Giulio
name: Ronconi, Tommaso
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We investigate the isotropic and anisotropic components of the Stochastic Gravitational Wave Background (SGWB) originated from unresolved merging compact binaries in galaxies. We base our analysis on an empirical approach to galactic astrophysics that allows to follow the evolution of individual systems. We then characterize the energy density of the SGWB as a tracer of the total matter density, in order to compute the angular power spectrum of anisotropies with the Cosmic Linear Anisotropy Solving System (CLASS) public code in full generality. We obtain predictions for the isotropic energy density and for the angular power spectrum of the SGWB anisotropies, and study the prospect for their observations with advanced Laser Interferometer Gravitational-Wave and Virgo Observatories and with the Einstein Telescope. We identify the contributions coming from different type of sources (binary black holes, binary neutron stars and black hole-neutron star) and from different redshifts. We examine in detail the spectral shape of the energy density for all types of sources, comparing the results for the two detectors. We find that the power spectrum of the SGWB anisotropies behaves like a power law on large angular scales and drops at small scales: we explain this behaviour in terms of the redshift distribution of sources that contribute most to the signal, and of the sensitivities of the two detectors. Finally, we simulate a high resolution full sky map of the SGWB starting from the power spectra obtained with CLASS and including Poisson statistics and clustering properties.
description: 35 pages, 12 figures
Ταφικές πρακτικές και σκελετικά κατάλοιπα στην περιοχή της Μαγνησίας στη Μέση και Ύστερη εποχή του Χαλκού
Creators: name: Σταματάκη, Ελισάβετ Κωνσταντίνου
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: ταφικές πρακτικές
οστεολογική και παλαιοπαθολογική ανάλυση
Θεσσαλία
funerary practices
osteological and palaeopathological analysis
Thessaly

description: Η παρούσα μεταπτυχιακή εργασία εξετάζει τις ταφικές πρακτικές και τον τρόπο μεταχείρισης των νεκρών στην περιοχή της Μαγνησίας κατά την Μέση και Ύστερη εποχή του Χαλκού. Παράλληλα με τη γενική βιβλιογραφική ανακεφαλαίωση που επιχειρείται ως προς τη συλλογή των δεδομένων, μεγάλο μέρος της εργασίας περιλαμβάνει τα αποτελέσματα της μελέτης πρόσφατα ανασκαμμένων ανθρώπινων σκελετικών καταλοίπων που προέρχονται από δύο θέσεις στην παράλια ζώνη της Μαγνησίας. Πρόκειται για ένα σύνολο πολλαπλών ταφών του κτιστού θαλαμοειδούς Τάφου 2 στο Διμήνι, που τοποθετείται χρονολογικά στο τέλος της Μέσης εποχής του Χαλκού, δύο μεμονωμένων τάφων εξωτερικά και σύγχρονων με το Μέγαρο Α’ από την ίδια θέση, με χρονολόγηση στην Ύστερη εποχή του Χαλκού και πέντε λακκοειδών τάφων σύγχρονων με το θολωτό τάφο στη θέση Καζανάκι που βρέθηκαν έξω από αυτόν και χρονολογούνται επίσης στην Ύστερη εποχή του Χαλκού. Μετά το αναλυτικό κομμάτι ακολουθεί σύνοψη και συζήτηση των αποτελεσμάτων της μακροσκοπικής μελέτης των σκελετικών καταλοίπων με τα αντίστοιχα συμπεράσματα να ενσωματώνονται στη σύνθεση που αφορά τις ανθρωπολογικές αναλύσεις σκελετικών συνόλων της Θεσσαλίας από τη 2η χιλ. π.Χ.
description: This master thesis investigates the burial practices and the treatment of the dead in the region of Magnesia from the Middle to Late Bronze Age period. First of all, the funerary practices of the region of Thessaly were examined bibliographically in order to collect all the available information about the treatment of the dead during the Middle and Late Bronze Age period. Continually, the recently excavated human skeletal remains from Dimini and Kazanaki (Magnesia, Greece) were examined using the microscopical osteological analysis. Finally, the results of the osteological analysis were compared with the other anthropological analyses from Thessaly from the same time period
Optimization-based controller tuning using the Q-parameterization
Creators: name: Lynch, Alan F.
Publisher: name: University of British Columbia
Year: 2009

description: We consider the problem of tuning a closed-loop linear controller for a continuous-time linear, lumped, exponentially stable plant using measurements. A two-step tuning method is proposed based on an “internal model” controller structure. The motivation for developing the method is to reduce the effect of modeling error on the design and to reduce the amount of computation required compared to a similar design performed off-line. The first step is to solve a controller design problem formulated as a sequence of convex optimization problems in which the cost and constraint functionals and their descent directions are computed directly from plant measurements. The designer is comfortable in specifying desired performance by adjusting the weights of a weighted-max cost function composed of a wide range of time and frequency domain performance functionals. To implement the “internal model” controller, a plant model is obtained in the second step. The identification objective makes the plant model depend on the desired closed-loop performance. To ensure a robust design, the model satisfies a worst-case error bound which depends on information about the plant, the experiment duration, the noise level, and the order of the model.
Quantum SU(3) Skyrme model with noncanonical embedded SO(3) soliton
Creators: name: Jurciukonis, D.
name: Norvaisas, E.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: The new ansatz which is the SO(3) group soliton was defined for the SU(3) Skyrme model. The model is considered in noncanonical bases $SU(3)\supset SO(3)$ for the state vectors. A complete canonical quantization of the model have been investigated in the collective coordinate formalism for the fundamental SU(3) representation of the unitary field. The independent quantum variables manifold cover all the eight dimensions SU(3) group manifold due to the new ansatz. The explicit expressions of the Lagrangian and Hamiltonian densities are derived for this modified quantum skyrmion.
description: 8 RevTex4 pages, no figures
The symbiotic binary ZZ CMi: intranight variability and suggested outbursting nature
Creators: name: Zamanov, R. K.
name: Stoyanov, K. A.
name: Kostov, A.
name: Kurtenkov, A.
name: Nikolov, G.
name: Latev, G.
name: Bode, M. F.
name: Marti, J.
name: Luque-Escamilla, P. L.
name: Tomov, N.
name: Nikolov, Y. M.
name: Boeva, S. S.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: We present photometric and spectral observations of the symbiotic star ZZ CMi. We detect intranight variability - flickering and smooth variations in U band. The amplitude of the flickering is about 0.10-0.20 mag in U band. In the B band the variability is lower, with amplitude less than 0.03 mag. We also detect variability in the H-alpha and H-beta emission lines, and find an indication for outflow with velocity of about 120-150 km/s. The results indicate that ZZ CMi is an accretion powered symbiotic containing an M4-M6 III cool component with an white dwarf resembling recurrent novae and jet-ejecting symbiotic stars. [The data are available on www.astro.bas.bg/~rz/ZZCMi/ZZCMi.tar.gz]
description: accepted in Astronomische Nachrichten / Astronomical Notes
Επίδραση παραγόντων anti-IL-6 και anti-TNF-α στη νεφρική λειτουργία επίμυων με κολλαγονοεπαγώμενη αρθρίτιδα μέτριας βαρύτητας
Creators: name: Αλεβίζου, Ελένη Σωτηρίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: Κλινική Φαρμακολογία
Βιομηχανική Φαρμακολογία
Κλινική Τοξικολογία
Καταγραφή
Clinical Pharmacology
Industrial Pharmacology
Clinical Toxicology
Reference

description: Η Νεανική Ρευματοειδής Αρθρίτιδα είναι μια αυτοάνοση νόσος που παρουσιάζεται σε μεγάλο τμήμα του πληθυσμού παγκόσμια. Λόγω αυτού, η ανάγκη για εύρεση αποτελεσματικότερων θεραπειών από τις μέχρι τώρα υπάρχουσες αποτελεί κυρίαρχο στόχο των ερευνητών παγκοσμίως. Στην παρούσα εργασία περιγράφονται βασικά στοιχεία σχετικά με την νόσο όπως η αιτιογένεση αυτής, ο μηχανισμός της νόσου καθώς και κυρίαρχα μόρια υπεύθυνα για την εμφάνιση της. Έπειτα, αναφέρονται οι Ευρωπαϊκές και Ελληνικές κατευθυντήριες οδηγίες σχετικά με τη διαχείριση της νόσου και την υπάρχουσα φαρμακοθεραπεία. Δίνεται ιδιαίτερη έμφαση στη συσχέτιση της νεφρικής λειτουργίας με τη παραδοσιακή ως τώρα φαρμακοθεραπεία (csDMARDs), με τα βιολογικά τροποποιητικά της νόσου αντιρρευματικά φάρμακα (bDMARDs) καθώς και στην νεφρική λειτουργία όταν γίνεται συνδυασμός αυτών των δύο κατηγοριών φαρμάκων. Για το σκοπό αυτό μελετάται ο παράγοντας ΚΙΜ-1, ενδεικτικός για τη ποιότητα της νεφρικής λειτουργίας καθώς και οι δείκτες ουρία και κρεατινίνη με σκοπό να καθοριστεί η συσχέτιση των διάφορων φαρμακοθεραπειών με τη νεφρική λειτουργία και τη πρόκληση νεφροτοξικότητας
description: Juvenile Rheumatoid Arthritis is an autoimmune disease that occurs in a large part of the population. Because of this, the need to find more effective therapies than those that exist is a major goal for researchers worldwide. The present work analyzes key elements of the disease such as its trigger, the mechanism of the disease and the dominant molecules responsible for its occurrence. Next, the European and Greek guidelines on disease management and existing pharmacotherapy are mentioned. Particular emphasis is placed on relating renal function to established pharmacotherapy but also to the biological modifiers of the disease, considered to be particularly effective and promising molecules in limiting its progression, as well as to the combination of both treatments. For this reason the study, in its experimental part, focuses on KIM-1 antibody, as well as on urea and creatinine in order to correlate their effect as a monotherapy or in combination with csDMARDs on renal function, in patients that suffer from moderate Rheumatoid Arthritis
Imitation learning for variable speed motion generation over multiple actions
Creators: name: Saigusa, Yuki
name: Sasagawa, Ayumu
name: Sakaino, Sho
name: Tsuji, Toshiaki
Publisher: name: arXiv
Year: 2021
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: Robotic motion generation methods using machine learning have been studied in recent years. Bilateral control-based imitation learning can imitate human motions using force information. By means of this method, variable speed motion generation that considers physical phenomena such as the inertial force and friction can be achieved. However, the previous study only focused on a simple reciprocating motion. To learn the complex relationship between the force and speed more accurately, it is necessary to learn multiple actions using many joints. In this paper, we propose a variable speed motion generation method for multiple motions. We considered four types of neural network models for the motion generation and determined the best model for multiple motions at variable speeds. Subsequently, we used the best model to evaluate the reproducibility of the task completion time for the input completion time command. The results revealed that the proposed method could change the task completion time according to the specified completion time command in multiple motions.
description: Copyright 2021 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works
Nutrition data impact evaluations: guidelines for analysing pathways to impact
Creators: name: Berdou, Evangelia
name: Lokers, Rob
Publisher: name: F1000 Research Limited
Year: 2019

description: GODAN Action supports data users, producers and intermediaries to effectively engage with open data and maximise its potential for impact in the agriculture and nutrition sectors. In particular, we work to strengthen capacity, to promote common standards and best practice, and to improve how we measure impact.

This report describes the results of the evaluation of case studies performed by the GODAN Action project in the area of open nutrition data.

The case studies that were evaluated focus on better understanding the cycle of open data production and use for nutrition data, as illustrated in the work of a global aggregator, the Global Nutrition Report (GNR), and African national and regional actors involved in advocacy and policy making. Similarly to other evaluations conducted for open land and open weather data, this study seeks to refine certain aspects of the GODAN Action Open Data Evaluation framework.

As with the weather and land data studies, this investigation focuses on the work and practices of intermediary actors and the specifics of the engaging environment, in particular the political economy. However, unlike the aforementioned studies, it takes a closer look at the links and disconnects between the development of a specific product that is meant to support global audiences, the GNR, and its use by policy-makers and activists on the ground.
Stellar population analysis of two ellipticals
Creators: name: Milone, A. de C.
name: Pastoriza, M.
name: Rickes, M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The spatial distributions of the mean luminosity-weighted stellar age, metallicity, and alpha/Fe ratio along both photometric axes of two nearby elliptical galaxies have been obtained using Lick index measurements on long slit spectra in order to reconstruct the star formation history in their kinematically distinct subsystems. Lick indexes were compared with those of single-aged stellar population (SSP) models. A population synthesis method was also applied in order to help disentangling the age-metallicity degeneracy. The stars characteristics are associated with their kinematics: they are older and alpha-enhanced in the not rotating bulge of NGC 1052 and counter rotating core of NGC 7796, while they show a strong spread of alpha/Fe and age along the rotating disk of NGC 1052 and an outwards radial decreasing of them outside the core of NGC 7796.
description: 2 pages, to appear in the Proceedings of IAU Symposium 241 "Stellar populations as building blocks of galaxies", A. Vazdekis & R. Peletier, eds
Free boundary regularity for a class of one-phase problems with non-homogeneous degeneracy
Creators: name: da Silva, João Vítor
name: Rampasso, Giane C.
name: Ricarte, Gleydson C.
name: Vivas, Hernán A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Analysis of PDEs (math.AP)
subject: FOS: Mathematics
subject: 35B65, 35J60, 35J70, 35R35

description: We consider a one-phase free boundary problem governed by doubly degenerate fully non-linear elliptic PDEs with non-zero right hand side, which should be understood as an analog (non-variational) of certain double phase functionals in the theory of non-autonomous integrals. By way of brief elucidating example, such non-linear problems in force appear in the mathematical theory of combustion, as well as in the study of some flame propagation problems. In such an environment we prove that solutions are Lipschitz continuous and they fulfil a non-degeneracy property. Furthermore, we address the Caffarelli's classification scheme: Flat and Lipschitz free boundaries are locally $C^{1, β}$ for some $0 < β(universal) < 1$.
A SCUBA survey of Orion, the low-mass end of the core mass function
Creators: name: Nutter, D.
name: Ward-Thompson, D.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We have re-analysed all of the SCUBA archive data of the Orion star-forming regions. We have put together all of the data taken at different times by different groups. Consequently we have constructed the deepest submillimetre maps of these regions ever made. There are four regions that have been mapped: Orion A North & South, and Orion B North & South. We find that two of the regions, Orion A North and Orion B North, have deeper sensitivity and completeness limits, and contain a larger number of sources, so we concentrate on these two. We compare the data with archive data from the Spitzer Space Telescope to determine whether or not a core detected in the submillimetre is pre-stellar in nature. We extract all of the pre-stellar cores from the data and make a histogram of the core masses. This can be compared to the stellar initial mass function (IMF). We find the high-mass core mass function follows a roughly Salpeter-like slope, just like the IMF, as seen in previous work. Our deeper maps allow us to see that the core mass function (CMF) turns over at ~ 1.3 Mo, about a factor of 4 higher than our completeness limit. This turnover has never previously been observed, and is only visible here due to our much deeper maps. It mimics the turnover seen in the stellar IMF at ~ 0.1 Mo. The low-mass side of the CMF is a power-law with an exponent of 0.35 +/- 0.2, which is consistent with the low-mass slope of the young cluster IMF of 0.3 +/- 0.1. This shows that the CMF continues to mimic the shape of the IMF all the way down to the lower completeness limit of these data at ~ 0.3 Mo.
description: 9 pages, inc. 6 figures (+ Appendix; 1 Table = 6 pages)
The Wolf-Rayet + Black Hole Binary NGC 300 X-1: What is the Mass of the Black Hole?
Creators: name: Binder, Breanna A.
name: Sy, Janelle M.
name: Eracleous, Michael
name: Christodoulou, Dimitris M.
name: Bhattacharya, Sayantan
name: Cappallo, Rigel
name: Laycock, Silas
name: Plucinsky, Paul P.
name: Williams, Benjamin F.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We present new X-ray and UV observations of the Wolf-Rayet + black hole binary system NGC 300 X-1 with the Chandra X-ray Observatory and the Hubble Space Telescope Cosmic Origins Spectrograph. When combined with archival X-ray observations, our X-ray and UV observations sample the entire binary orbit, providing clues to the system geometry and interaction between the black hole accretion disk and the donor star wind. We measure a binary orbital period of 32.7921$\pm$0.0003 hr, in agreement with previous studies, and perform phase-resolved spectroscopy using the X-ray data. The X-ray light curve reveals a deep eclipse, consistent with inclination angles of $i=60-75^{\circ}$, and a pre-eclipse excess consistent with an accretion stream impacting the disk edge. We further measure radial velocity variations for several prominent FUV spectral lines, most notably He II $λ$1640 and C IV $λ$1550. We find that the He II emission lines systematically lag the expected Wolf-Rayet star orbital motion by a phase difference $Δϕ\sim0.3$, while C IV $λ$1550 matches the phase of the anticipated radial velocity curve of the Wolf-Rayet donor. We assume the C IV $λ$1550 emission line follows a sinusoidal radial velocity curve (semi-amplitude = 250 km s$^{-1}$) and infer a BH mass of 17$\pm$4 M$_{\odot}$. Our observations are consistent with the presence of a wind-Roche lobe overflow accretion disk, where an accretion stream forms from gravitationally focused wind material and impacts the edge of the black hole accretion disk.
description: Accepted to ApJ. 22 pages, 16 figures, 7 tables
Observing the fluctuating stripes in high Tc superconductors
Creators: name: Cvetkovic, V.
name: Nussinov, Z.
name: Mukhin, S.
name: Zaanen, J.
Publisher: name: arXiv
Year: 2006
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Resting on the gauge theory of topological quantum melting in 2+1 dimensions, we predict that a superconductor characterized by crystalline correlations on a length scale large compared to the lattice carries a new collective mode: the massive shear photon. This mode is visible in the electrodynamic response and the ramification of our theory is that electron energy loss spectroscopy can be employed to prove or disprove the existence of dynamical stripes in cuprate superconductors.
description: 5 pages, 1 figure
The one-dimensional Long-Range Falikov-Kimball Model: Thermal Phase Transition and Disorder-Free Localisation
Creators: name: Hodson, Thomas
name: Willsher, Josef
name: Knolle, Johannes
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: Disorder or interactions can turn metals into insulators. One of the simplest settings to study this physics is given by the Falikov-Kimball model, which describes itinerant fermions interacting with a classical Ising background field. Despite the translational invariance of the model, inhomogenous configurations of the background field give rise to effective disorder physics which lead to a rich phase diagram in two (or more) dimensions with finite temperature charge density wave (CDW) transitions and interaction-tuned Anderson versus Mott localized phases. Here, we propose a generalised Falikov-Kimball model in one dimension with long-range interactions which shows a similarly rich phase diagram. We use an exact Markov Chain Monte Carlo method to map the phase diagram and compute the energy resolved localisation properties of the fermions. We compare the behaviour of this transitionally invariant model to an Anderson model of uncorrelated binary disorder about a background CDW field which confirms that the fermionic sector only fully localizes for very large system sizes.
description: 7 pages, 4 figures