cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
The critical field and specific heat in the electron- and hole-doped graphene superconductors
Creators: name: Drzazga-Szczęśniak, Ewa A.
name: Kaczmarek, Adam Z.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Doping is one of the most prominent techniques to alter properties of a given material. Herein, the influence of the electron- and hole-doping on the selected superconducting properties of graphene are considered. In details, the Migdal-Eliashberg formalism is employed to analyze the specific heat and the critical magnetic field in the representative case of graphene doped with nitrogen or boron, respectively. It is found that the electron doping is much more favorable in terms of enhancing the aforementioned properties than its hole counterpart. These findings are appropriately summarized by the means of the dimensionless thermodynamic ratios, familiar in the Bardeen-Cooper-Schrieffer theory. To this end, the perspectives for future research on superconductivity in graphene are drawn.
description: 5 pages, 2 figures, 1 table
The Stellar Mass Function in CANDELS and Frontier Fields: the build-up of low mass passive galaxies since z~3
Creators: name: Santini, P.
name: Castellano, M.
name: Fontana, A.
name: Fortuni, F.
name: Menci, N.
name: Merlin, E.
name: Pagul, A.
name: Testa, V.
name: Calabrò, A.
name: Paris, D.
name: Pentericci, L.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Despite significant efforts in the recent years, the physical processes responsible for the formation of passive galaxies through cosmic time remain unclear. The shape and evolution of the Stellar Mass Function (SMF) give an insight into these mechanisms. Taking advantage from the CANDELS and the deep Hubble Frontier Fields (HFF) programs, we estimated the SMF of total, star-forming and passive galaxies from z=0.25 to z=2.75 to unprecedented depth, and focus on the latter population. The density of passive galaxies underwent a significant evolution over the last 11 Gyr. They account for 60% of the total mass in the nearby Universe against ~20% observed at z~2.5. The inclusion of the HFF program allows us to detect, for the first time at z>1.5, the characteristic upturn in the SMF of passive galaxies at low masses, usually associated with environmental quenching. We observe two separate populations of passive galaxies evolving on different timescales: roughly half of the high mass systems were already quenched at high redshift, while low mass passive galaxies are gradually building-up over the redshift range probed. In the framework of environmental-quenching at low masses, we interpret this finding as evidence of an increasing role of the environment in the build-up of passive galaxies as a function of time. Finally, we compared our findings with a set of theoretical predictions. Despite good agreement in some redshift and mass intervals, none of the models are able to fully reproduce the observations. This calls for further investigation into the involved physical mechanisms, both theoretically and observationally, especially with the brand new JWST data.
description: Accepted for publication in ApJ (very minor changes compared to v1)
Views of the Process and Content of Ethical Reviews of HIV Vaccine Trials Among Members of US Institutional Review Boards and South African Research Ethics Committees
Creators: name: Klitzman, Robert L.
Publisher: name: Columbia University
Year: 2008
Subjects: AIDS vaccines--Research
AIDS vaccines--Research--Moral and ethical aspects
Institutional review boards (Medicine)
Informed consent (Medical law)
Developing countries

description: Given the ethical controversies concerning HIV vaccine trials (HVTs), we aimed to understand through an exploratory study how members of institutional review boards (IRBs) in the United States (US) and research ethics committees (RECs) in South Africa (SA) view issues concerning the process and content of reviews of these studies. We mailed packets of 20 questionnaires to 12 US IRB chairs and administrators and seven REC chairs to distribute to their members. We received 113 questionnaires (76 from the US and 37 from SA). In both countries, members tended to be white males with advanced academic degrees. Compared to the US, SA members called for ‘major changes’ in HVT protocols more frequently (p = 0.004), and were less likely to think that HVT participants understood risks and benefits (p = 0.033) or informed consent forms (p = 0.000). In both countries, members were divided on several critical issues (e.g. the minimum standard for treatment for HVT participants who became infected during the HVT), but agreed that they needed more training. Of the SA respondents, 40% reported that they were ‘self‐taught’ in ethics. This study, the first we know of to offer quantitative data comparing US vs. non‐US IRBs/RECs, thus suggests key similarities and differences (e.g. compared to SA respondents, US respondents appeared to overestimate participants' understanding of informed consent), along with needs for education. These initial exploratory data in this area have important implications for IRBs, RECs, policy‐makers and scholars concerning future practice, training, policy, and investigations in research ethics, and prevention and treatment of HIV and other diseases in the developing world and elsewhere.
Codimension-2 defects and higher symmetries in (3+1)D topological phases
Creators: name: Barkeshli, Maissam
name: Chen, Yu-An
name: Huang, Sheng-Jie
name: Kobayashi, Ryohei
name: Tantivasadakarn, Nathanan
name: Zhu, Guanyu
Publisher: name: arXiv
Year: 2022
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: High Energy Physics - Theory (hep-th)
subject: Mathematical Physics (math-ph)
subject: Quantum Algebra (math.QA)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences
subject: FOS: Mathematics

description: (3+1)D topological phases of matter can host a broad class of non-trivial topological defects of codimension-1, 2, and 3, of which the well-known point charges and flux loops are special cases. The complete algebraic structure of these defects defines a higher category, and can be viewed as an emergent higher symmetry. This plays a crucial role both in the classification of phases of matter and the possible fault-tolerant logical operations in topological quantum error correcting codes. In this paper, we study several examples of such higher codimension defects from distinct perspectives. We mainly study a class of invertible codimension-2 topological defects, which we refer to as twist strings. We provide a number of general constructions for twist strings, in terms of gauging lower dimensional invertible phases, layer constructions, and condensation defects. We study some special examples in the context of $\mathbb{Z}_2$ gauge theory with fermionic charges, in $\mathbb{Z}_2 \times \mathbb{Z}_2$ gauge theory with bosonic charges, and also in non-Abelian discrete gauge theories based on dihedral ($D_n$) and alternating ($A_6$) groups. The intersection between twist strings and Abelian flux loops sources Abelian point charges, which defines an $H^4$ cohomology class that characterizes part of an underlying 3-group symmetry of the topological order. The equations involving background gauge fields for the 3-group symmetry have been explicitly written down for various cases. We also study examples of twist strings interacting with non-Abelian flux loops (defining part of a non-invertible higher symmetry), examples of non-invertible codimension-2 defects, and examples of interplay of codimension-2 defects with codimension-1 defects. We also find an example of geometric, not fully topological, twist strings in (3+1)D $A_6$ gauge theory.
description: 70 pages, 42 figures
Time dependent black holes and scalar hair
Creators: name: Chadburn, Sarah
name: Gregory, Ruth
Publisher: name: arXiv
Year: 2013
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We show how to correctly account for scalar accretion onto black holes in scalar field models of dark energy by a consistent expansion in terms of a slow roll parameter. We find an exact solution for the scalar field within our Hubble volume which is regular on both black hole and cosmological event horizons, and compute the back reaction of the scalar on the black hole, calculating the resulting expansion of the black hole. Our results are independent of the relative size of black hole and cosmological event horizons. We comment on the implications for more general black hole accretion, and the no hair theorems.
description: 20 pages, 3 figures, published version
Tubes of magnetic flux and electric current in space physics
Creators: name: Kleman, Maurice
name: Robbins, Jonathan M.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: The singularities of an irrotational magnetic field are lines of electric current. This property derives from the relationship between vector fields and the topology of the underlying three-space and allows for a definition of {cosmic field} flux tubes and flux ropes as \textit{cores} (in the sense of the physics of defects) of helical singularities. When applied to force-free flux ropes, and assuming current conservation, an interesting feature is the quantization of the radii, pitches, and helicities. One expects similar quantization effects in the general case. In the special case when the total electric current vanishes, a force-free rope embedded in a medium devoid of magnetic field is nonetheless topologically stable, because it is the core of a singularity of the vector potential. Magnetic merging is also discussed in the same framework.
description: 26 pages, 6 figures. Updated version, with no changes in substance
Spin Boltzmann equation for non-relativistic spin-1/2 fermions
Creators: name: Dong, Wen-Bo
name: Yin, Yi-Liang
name: Wang, Qun
Publisher: name: arXiv
Year: 2022
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We derive the spin Boltzmann equations for spin-1/2 fermions in a non-relativistic model with four-fermion contact interaction which conserves spin degrees of freedom. A great advantage of the model is that the spin matrix elements in collision terms can be completely worked out and be put into such a compact form that one can clearly see how spins are coupled in particle scatterings. A semi-classical expansion in the Planck constant has been made and the on-shell part of the spin Boltzmann equation up to the next-to-leading order is derived. At the leading order the equilibrium spin distribution can be obtained from the vanishing of the collision term for the spin density. The spin chemical potential emerges as a natural consequence of spin conservation. The off-shell part of the spin Boltzmann equation is also discussed. The work can be extended to more sophisticated interaction such as nuclear force in order to apply to spin polarization phenomena in heavy-ion collisions at low energies.
description: RevTex 4, 15 pages, 1 figure
title: Four Decades of Canadian Earnings Inequality and Dynamics Across Workers and Firms
Creators: name: Bowlus, Audra
name: Gouin-Bonenfant, Émilien
name: Liu, Huju
name: Lochner, Lance
name: Park, Youngmin
Publisher: name: Bank of Canada
Year: 2021

description: We use four decades of Canadian matched employer-employee data to explore how inequality and the dynamics of individual earnings have evolved over time in Canada. We also examine how the earnings growth of individuals is related to the growth of their employers.

description: Nous utilisons des données appariées entre les employeurs et les employés canadiens couvrant une période de quatre décennies pour étudier l’évolution des inégalités et de la dynamique des revenus individuels au fil du temps au Canada. Nous examinons aussi la relation entre la croissance de la rémunération des travailleurs et celle des entreprises qui les emploient.
The 3d and 5d electronic structures and orbital hybridization in Ba- and Ca-doped La2CoIrO6 double perovskite
Creators: name: Mardegan, J. R. L.
name: Veiga, L. S. I.
name: Pohlmann, T.
name: Dhesi, S. S.
name: Francoual, S.
name: Jesus, J. R.
name: Macchiutti, C.
name: Bittar, E. M.
name: Bufaiçal, L.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Here we present a detailed investigation of the Co and Ir local electronic structures in La1.5A0.5CoIrO6 (A = Ba, Ca) compounds in order to unravel the orbital hybridization mechanism in these CoIr-based double perovskites. Our results of x-ray powder diffraction, ac and dc magnetization, Co and Ir L2,3-edges and Co K-edge x-ray absorption spectroscopy and x-ray magnetic circular dichroism suggest a competition between magnetic interactions. A dominant antiferromagnetic coupling is found to be responsible for the ferrimagnetic behavior observed for A = Ca below approximately 96 K, the competing magnetic phases and the cationic disorder in this compound giving rise to a spin-glass state at low temperatures. For the A = Ba, on the other hand, there is no evidence of long range order down to its spin-glass transition temperature. The remarkably different magnetic properties observed between these two compounds is discussed in terms of the structural distortion that alters the strength of the Co - Ir couplings, with a relevant role played by the Co 3d eg - Ir 5d j = 1/2 hybridization.
description: 10 pages, 6 figures
On linear systems and a conjecture of D. C. Butler
Creators: name: Bhosle, U. N.
name: Brambila-Paz, L.
name: Newstead, P. E.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 14H60

description: Let $C$ be a smooth irreducible projective curve of genus $g$ and $L$ a line bundle of degree $d$ generated by a linear subspace $V$ of $H^0(L)$ of dimension $n+1$. We prove a conjecture of D. C. Butler on the semistability of the kernel of the evaluation map $V\otimes{\mathcal O}_C\to L$ and obtain new results on the stability of this kernel. The natural context for this problem is the theory of coherent systems on curves and our techniques involve wall crossing formulae in this theory.
description: Final version accepted for publication in Internat. J. math
RR Lyrae stars in the globular cluster Palomar 2
Creators: name: Ferro, A. Arellano
name: Fierro, I. Bustos
name: Muneer, S.
name: Giridhar, S.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: A CCD VI imaging time-series over 11-year is employed to explore the light curves of stars in the field of Palomar 2. We discovered 20 RRab and 1 RRc variables. A revision of Gaia-DR3 data enabled us to identify 10 more variables and confirm the RRab nature of 6 of them and one RGB. The cluster membership is discussed and 18 variables are most likely cluster members. The Fourier light curve decomposition for the 11 best quality light curves of cluster member stars leads to independent estimates of the cluster distance 27.2 +- 1.8 kpc and [Fe/H]ZW=-1.39 +- 0.55. We confirm the cluster as of the Oo I type.
description: 10 pages, 6 figures, 1 table. Submitted to Revista Mexicana de Astronom\'ia y Astrof\'isica
MAP Estimators and Their Consistency in Bayesian Nonparametric Inverse Problems
Creators: name: Dashti, Masoumeh
name: Law, Kody J. H.
name: Stuart, Andrew M.
name: Voss, Jochen
Publisher: name: arXiv
Year: 2013
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics
subject: 49N45 60G35 62F15

description: We consider the inverse problem of estimating an unknown function $u$ from noisy measurements $y$ of a known, possibly nonlinear, map $\mathcal{G}$ applied to $u$. We adopt a Bayesian approach to the problem and work in a setting where the prior measure is specified as a Gaussian random field $μ_0$. We work under a natural set of conditions on the likelihood which imply the existence of a well-posed posterior measure, $μ^y$. Under these conditions we show that the {\em maximum a posteriori} (MAP) estimator is well-defined as the minimiser of an Onsager-Machlup functional defined on the Cameron-Martin space of the prior; thus we link a problem in probability with a problem in the calculus of variations. We then consider the case where the observational noise vanishes and establish a form of Bayesian posterior consistency. We also prove a similar result for the case where the observation of $\mathcal{G}(u)$ can be repeated as many times as desired with independent identically distributed noise. The theory is illustrated with examples from an inverse problem for the Navier-Stokes equation, motivated by problems arising in weather forecasting, and from the theory of conditioned diffusions, motivated by problems arising in molecular dynamics.
description: changed title, minor fixes
Ion Intercalation in Lanthanum Strontium Ferrite for Aqueous Electrochemical Energy Storage Devices
Creators: name: Tang, Yunqing
name: Chiabrera, Francesco
name: Morata, Alex
name: Cavallaro, Andrea
name: Liedke, Maciej O.
name: Avireddy, Hemesh
name: Maller, Mar
name: Butterling, Maik
name: Wagner, Andreas
name: Stchakovsky, Michel
name: Baiutti, Federico
name: Aguadero, Ainara
name: Tarancón, Albert
Publisher: name: arXiv
Year: 2023
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Ion intercalation of perovskite oxides in liquid electrolytes is a very promising method for controlling their functional properties while storing charge, which opens the potential application in different energy and information technologies. Although the role of defect chemistry in the oxygen intercalation in a gaseous environment is well established, the mechanism of ion intercalation in liquid electrolytes at room temperature is poorly understood. In this study, the defect chemistry during ion intercalation of La0.5Sr0.5FeO3-δ thin films in alkaline electrolytes is studied. Oxygen and proton intercalation into the LSF perovskite structure is observed at moderate electrochemical potentials (0.5 V to -0.4 V), giving rise to a change in the oxidation state of Fe (as a charge compensation mechanism). The variation of the concentration of holes as a function of the intercalation potential was characterized by in-situ ellipsometry and the concentration of electron holes was indirectly quantified for different electrochemical potentials. Finally, a dilute defect chemistry model that describes the variation of defect species during ionic intercalation was developed.
Strong Connectivity in Real Directed Networks
Creators: name: Rodgers, Niall
name: Tino, Peter
name: Johnson, Samuel
Publisher: name: arXiv
Year: 2022
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: FOS: Physical sciences

description: In many real, directed networks, the strongly connected component of nodes which are mutually reachable is very small. This does not fit with current theory, based on random graphs, according to which strong connectivity depends on mean degree and degree-degree correlations. And it has important implications for other properties of real networks and the dynamical behaviour of many complex systems. We find that strong connectivity depends crucially on the extent to which the network has an overall direction or hierarchical ordering -- a property measured by trophic coherence. Using percolation theory, we find the critical point separating weakly and strongly connected regimes, and confirm our results on many real-world networks, including ecological, neural, trade and social networks. We show that the connectivity structure can be disrupted with minimal effort by a targeted attack on edges which run counter to the overall direction. And we illustrate with example dynamics -- the SIS model, majority vote, Kuramoto oscillators and the voter model -- how a small number of edge deletions can utterly change dynamical processes in a wide range of systems.
description: 16 pages, 6 figures
Ljudmil Ferdinandov Vagalinski, Krăv i zrelišta. Sportni i gladiatorski igri v elenističeska i rimska Trakija. Blood and entertainments. Sports and gladiatorial games in hellenistic and Roman Thrace
Creators: name: Conrad, Sven
Publisher: name: Bonner Jahrbücher
Year: 2017

description: Rezension zu: Ljudmil Ferdinandov Vagalinski, Krăv i zrelišta. Sportni i gladiatorski igri v elenističeska i rimska Trakija. Blood and entertainments. Sports and gladiatorial games in hellenistic and Roman Thrace. (Bulgarischer Text mit ausführlichem englischen Resümee.) Verlag Nous, Sofia 2009. 228 Seiten mit etwa 142 Abbildungen
description: Bonner Jahrbücher, Bd. 209.2009(2011): Bonner Jahrbücher
A Birth-Death-Migration Model for Life in Astrophysical Environments
Creators: name: Lingam, Manasvi
name: Grimaldi, Claudio
name: Balbi, Amedeo
Publisher: name: arXiv
Year: 2023
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: To assess the number of life-bearing worlds in astrophysical environments, it is necessary to take the intertwined processes of abiogenesis (birth), extinction (death), and transfer of life (migration) into account. We construct a mathematical model that incorporates this trio of mechanisms and accordingly derive the probability distribution function and other statistical properties (e.g., mean) for the number of worlds with biospheres. We show that a given astrophysical setting may become eventually saturated with life if the rate of successful transfers of organisms is higher than the extinction rate of biospheres. Based on the available data, we suggest that this criterion might be fulfilled for star-forming clusters (and perhaps the Galactic bulge under optimal circumstances), thereby indicating that such regions could constitute promising abodes for hosting and detecting life.
description: 8 pages, 3 figures. Published on 28 October 2021 in MNRAS
A super-linear "radio-AGN main sequence'' links mean radio-AGN power and galaxy stellar mass since z$\sim$3
Creators: name: Delvecchio, I.
name: Daddi, E.
name: Sargent, M. T.
name: Aird, J.
name: Mullaney, J. R.
name: Magnelli, B.
name: Elbaz, D.
name: Bisigello, L.
name: Ceraj, L.
name: Jin, S.
name: Kalita, B. S.
name: Liu, D.
name: Novak, M.
name: Prandoni, I.
name: Radcliffe, J. F.
name: Spingola, C.
name: Zamorani, G.
name: Allevato, V.
name: Rodighiero, G.
name: Smolcic, V.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Mapping the average AGN luminosity across galaxy populations and over time encapsulates important clues on the interplay between supermassive black hole (SMBH) and galaxy growth. This paper presents the demography, mean power and cosmic evolution of radio AGN across star-forming galaxies (SFGs) of different stellar masses (${M_{*}}$). We exploit deep VLA-COSMOS 3 GHz data to build the rest-frame 1.4 GHz AGN luminosity functions at 0.1$\leq$$z$$\leq$4.5 hosted in SFGs. Splitting the AGN luminosity function into different ${M_{*}}$ bins reveals that, at all redshifts, radio AGN are both more frequent and more luminous in higher ${M_*}$ than in lower ${M_*}$ galaxies. The cumulative kinetic luminosity density exerted by radio AGN in SFGs peaks at $z$$\sim$2, and it is mostly driven by galaxies with 10.5$\leq$$\log$(${M_{*}}$/${M_{\odot}}$)$<$11. Averaging the cumulative radio AGN activity across all SFGs at each (${M_{*}}$,$z$) results in a "radio-AGN main sequence" that links the time-averaged radio-AGN power $\langle$$L_{1.4}^{AGN}$$\rangle$ and galaxy stellar mass, in the form: $\log$$\langle$[$L_{1.4}^{AGN}$/ W Hz$^{-1}]\rangle$ = (20.97$\pm$0.16) + (2.51$\pm$0.34)$\cdot$$\log$(1+$z$) + (1.41$\pm$0.09)$\cdot$($\log$[${M_{*}}$/${M_{\odot}}$] -10). The super-linear dependence on ${M_{*}}$, at fixed redshift, suggests enhanced radio-AGN activity in more massive SFGs, as compared to star formation. We ascribe this enhancement to both a higher radio AGN duty cycle and a brighter radio-AGN phase in more massive SFGs. A remarkably consistent ${M_{*}}$ dependence is seen for the evolving X-ray AGN population in SFGs. This similarity is interpreted as possibly driven by secular cold gas accretion fueling both radio and X-ray AGN activity in a similar fashion over the galaxy's lifetime.
description: Accepted for publication in A&A. 20 pages + Appendices
Detecting squarefree numbers
Creators: name: Booker, Andrew R.
name: Hiary, Ghaith A.
name: Keating, Jon P.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Number Theory (math.NT)
subject: Data Structures and Algorithms (cs.DS)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: We present an algorithm, based on the explicit formula for $L$-functions and conditional on GRH, for proving that a given integer is squarefree with little or no knowledge of its factorization. We analyze the algorithm both theoretically and practically, and use it to prove that several RSA challenge numbers are not squarefull.
description: 31 pages, 3 figures, latest version
Maier, Friedrich (Hrsg.): Latein auf neuen Wegen. Alternative Formen des Unterrichts. Impulse aus den Arbeitskreisen des Bundeskongresses des Deutschen Altphilologenverbandes in Heidelberg 1998
Creators: name: Wölke, Hansjörg
Publisher: name: Forum Classicum
Year: 2017

description: Rezension zu: Maier, Friedrich (Hrsg.): Latein auf neuen Wegen. Alternative Formen des Unterrichts. Impulse aus den Arbeitskreisen des Bundeskongresses des Deutschen Altphilologenverbandes in Heidelberg 1998. Bamberg: Buchners 1999. 163 S., 36,20 DM (Auxilia. 44; ISBN3-7661-5444-3).
description: Forum Classicum, Nr. 3 (1999): Forum Classicum
title: Ιδιομορφική ανάλυση του Νεωρίου του Μόρο
Creators: name: Γιανναράκη Δέσποινα
Publisher: name: Technical University of Crete
Year: 2009

description:  Εισαγωγή -- 2. Ιστορικά στοιχεία για τα Νεώρια -- 3. Operational Model Analysis (OMA) -- 4. Διεξαγωγή της μέτρησης και επεξεργασία των δεδομένων -- 5. Ιδιομορφική ανάλυση του Νεωρίου του Μόρο
Synchronous Counting and Computational Algorithm Design
Creators: name: Dolev, Danny
name: Heljanko, Keijo
name: Järvisalo, Matti
name: Korhonen, Janne H.
name: Lenzen, Christoph
name: Rybicki, Joel
name: Suomela, Jukka
name: Wieringa, Siert
Publisher: name: arXiv
Year: 2013
Subjects: subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: Computational Complexity (cs.CC)
subject: Data Structures and Algorithms (cs.DS)
subject: FOS: Computer and information sciences

description: Consider a complete communication network on $n$ nodes, each of which is a state machine. In synchronous 2-counting, the nodes receive a common clock pulse and they have to agree on which pulses are "odd" and which are "even". We require that the solution is self-stabilising (reaching the correct operation from any initial state) and it tolerates $f$ Byzantine failures (nodes that send arbitrary misinformation). Prior algorithms are expensive to implement in hardware: they require a source of random bits or a large number of states. This work consists of two parts. In the first part, we use computational techniques (often known as synthesis) to construct very compact deterministic algorithms for the first non-trivial case of $f = 1$. While no algorithm exists for $n < 4$, we show that as few as 3 states per node are sufficient for all values $n \ge 4$. Moreover, the problem cannot be solved with only 2 states per node for $n = 4$, but there is a 2-state solution for all values $n \ge 6$. In the second part, we develop and compare two different approaches for synthesising synchronous counting algorithms. Both approaches are based on casting the synthesis problem as a propositional satisfiability (SAT) problem and employing modern SAT-solvers. The difference lies in how to solve the SAT problem: either in a direct fashion, or incrementally within a counter-example guided abstraction refinement loop. Empirical results suggest that the former technique is more efficient if we want to synthesise time-optimal algorithms, while the latter technique discovers non-optimal algorithms more quickly.
description: 35 pages, extended and revised version
Strategic perspective of error management, the role of leadership, and an error management culture: a mediation model
Creators: name: Oliveira, Margarida F
name: Santos, EuláliaE
name: Ratten, Vanessa
Publisher: name: La Trobe
Year: 2023
Subjects: classificationCode: 3507
subject: Strategy, management and organisational behaviour
classificationCode: 3802
subject: Econometrics
subject: FOS: Economics and business
classificationCode: 3801
subject: Applied economics

description: Purpose: Errors are inevitable, resulting from the human condition itself, system failures and the interaction of both. It is essential to know how to deal with their occurrence, managing them. However, the negative tone associated with them makes it difficult for most organizations to talk about mistakes clearly and transparently, for fear of being harmed, preventing their detection, treatment and recovery. Consequently, errors are not managed, remaining accumulated in the system, turning into successive failures. Organizations need to recognize the inevitability of errors, making the system robust, through leadership and an organizational culture of error management. This study aims to understand the role of these influencing variables in an error management approach. Design/methodology/approach: In this paper, the authors applied the methodology of a quantitative nature based on a questionnaire survey that analyses error management, leadership and the organizational culture of error management of 380 workers in Portuguese companies. Findings: The results demonstrate that leadership directly influences error management and indirectly through the organizational culture of error management, giving this last variable a mediating role. Originality/value: The study covers companies from different sectors of activity on a topic that is little explored in Portugal, but part of the daily life of organizations, which should deserve greater attention from directors and managers, as they assume a privileged position to promote and develop error management mechanisms. Error management must be the daily work of leaders. This study contributes to theoretical knowledge and business practice on error management.
Views and approaches toward risks and benefits among doctors who become patients
Creators: name: Klitzman, Robert L.
Publisher: name: Columbia University
Year: 2006
Subjects: subject: Clinical medicine
subject: FOS: Clinical medicine
subject: Physician and patient
subject: Communication in medicine
subject: Health--Decision making

description: Objective: To understand how views and approaches concerning risks and benefits may be affected by dynamic contexts and processes related to clinical roles and relationships. Methods: We conducted two in-depth, semi-structured interviews with 50 doctors who became patients due to serious illnesses, concerning their experiences before and after diagnosis. Results: As patients, these doctors gained critical new insights into the processes and contexts of communication about risks and benefits. Doctors and patients often varied in how they viewed and weighed risks and benefits (e.g., as “good’ or “bad”). These data suggest a model in which patients undergo several dynamic processes: seeking statistics, accepting doctors’ framing of statistics, being influenced by media hype, seeing statistics as relevant or not, over-valuing risks, weighing the importance of risks and benefits, interpreting statistics as good or bad, accepting or denying statistics and odds, and making treatment decisions. These processes are affected by external factors (e.g., doctors ordering tests, framing statistics, and often over- versus under-valuing risks), and internal factors (e.g., depression, denial of illness, optimism versus pessimism, magical thinking – that doctors are immune to disease – and rationalizations). Conclusions: Doctors and patients are engaged in complex, dynamic processes that shape patients’ approaches toward risks and benefits. Practice Implications: These data highlight the need for increased attention toward these issues in medical educational and care.
Multi-modal imaging using a cascaded microscope design
Creators: name: Yang, Xi
name: Harfouche, Mark
name: Zhou, Kevin C.
name: Kreiss, Lucas
name: Xu, Shiqi
name: Kim, Kanghyun
name: Horstmeyer, Roarke
Publisher: name: arXiv
Year: 2022
Subjects: subject: Optics (physics.optics)
subject: Graphics (cs.GR)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: We present a new Multimodal Fiber Array Snapshot Technique (M-FAST), based on an array of 96 compact cameras placed behind a primary objective lens and a fiber bundle array. which is capable of large-area, high-resolution, multi-channel video acquisition. The proposed design provides two key improvements to prior cascaded imaging system approaches: a novel optical arrangement that accommodates the use of planar camera arrays, and the new ability to acquire multi-modal image data acquisition. M-FAST is a multi-modal, scalable imaging system that can acquire snapshot dual-channel fluorescence images as well as d phase contrast measurements over a large 8x10mm^2 FOV at 2.2um full-pitch resolution.
Real-space Obstruction in Quantum Spin Hall Insulators
Creators: name: Eck, Philipp
name: Ortix, Carmine
name: Consiglio, Armando
name: Erhardt, Jonas
name: Bauernfeind, Maximilian
name: Moser, Simon
name: Claessen, Ralph
name: Di Sante, Domenico
name: Sangiovanni, Giorgio
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The recently introduced classification of two-dimensional insulators in terms of topological crystalline invariants has been applied so far to "obstructed" atomic insulators characterized by a mismatch between the centers of the electronic Wannier functions and the ionic positions. We extend this notion to quantum spin Hall insulators in which the ground state cannot be described in terms of time-reversal symmetric localized Wannier functions. A system equivalent to graphene in all its relevant electronic and topological properties except for a real-space obstruction is identified and studied via symmetry analysis as well as with density functional theory. The low-energy model comprises a local spin-orbit coupling and a non-local symmetry breaking potential, which turn out to be the essential ingredients for an obstructed quantum spin Hall insulator. An experimental fingerprint of the obstruction is then measured in a large-gap triangular quantum spin Hall material.
description: 9 pages, 6 figures and 1 table. Supplementary material: 5 pages, 4 figures and 2 tables
Deformation dependence of 2p-radioactivity half-lives: Probe with a new formula across the mass region with Z<82
Creators: name: Saxena, G.
name: Aggarwal, Mamta
name: Singh, D.
name: Jain, A.
name: Sharma, P. K.
name: Yadav, H. L.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Effect of deformation on half-life of two-proton (2p) radioactivity is investigated across the periodic chart for nuclei with Z$<$82. 2p-decay half-lives are estimated by employing our newly proposed semi-empirical formula wherein the nuclear deformation has been incorporated in a phenomenological way. Robustness of the formula is demonstrated as it estimates the measured values quite accurately and, hence, reliably applied to predict the other possible 2p-emitters. For many proton rich nuclei for which experimental data on the decay energies are not available, we have used the theoretical values obtained from our calculations using the relativistic mean-field (RMF) approach. The uncertainties in the theoretical decay energy values are minimised by machine learning (ML) technique. Correlation of 2p-radioactivity with 2p-halo and deformation is probed. Our calculations show the phenomenon of shape coexistence in several 2p-emitters, wherein the prolate shape is found to be more predominant for the ground state.
description: 15 pages, 5 figures, Accepted in J. Phys. G: Nucl. Part. Phys
Renormalization group functions of QCD in the minimal MOM scheme
Creators: name: Gracey, J. A.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: We provide the full set of renormalization group functions for the renormalization of QCD in the minimal MOM scheme to four loops for the colour group SU(N_c).
description: 22 latex pages, error in the derivation of the four loop minimal MOM quark mass anomalous dimension corrected and erratum attached to original article; anc directory contains the updated txt file with corrected quark mass anomalous dimension as well as other anomalous dimensions, beta-functions and conversion functions
title: Χώροι Sobolev κι εφαρμογές στις διαφορικές εξισώσεις με μερικές παράγωγους
Creators: name: Ράος Αναστάσιος
Publisher: name: Technical University of Crete
Year: 2009

description:  Χώροι Sobolev -- 2. Παράγωγος συναρτήσεων -- 3. Το θεώρημα Mountain Pass -- 4. Ύπαρξη λύσεων για τη p-Laplacian quasilinear εξίσωση με τη μέθοδο fibrering
Cosmological dynamics of $f(R)$ gravity scalar degree of freedom in Einstein frame
Creators: name: Goswami, Umananda Dev
name: Deka, Kabita
Publisher: name: arXiv
Year: 2013
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: $f(R)$ gravity models belong to an important class of modified gravity models where the late time cosmic accelerated expansion is considered as the manifestation of the large scale modification of the force of gravity. $f(R)$ gravity models can be expressed in terms of a scalar degree of freedom by redefinition of models variable. The conformal transformation of the action from Jordan frame to Einstein frame makes the scalar degree of freedom more explicit and can be studied conveniently. We have investigated the features of the scalar degree of freedoms and the consequent cosmological implications of the power-law ($ξR^n$) and the Starobinsky (disappearing cosmological constant) $f(R)$ gravity models numerically in the Einstein frame. Both the models show interesting behaviour of their scalar degree of freedom and could produce the accelerated expansion of the Universe in the Einstein frame with the negative equation of state of the scalar field. However the scalar field potential for the power-law model is the well behaved function of the field, whereas the potential becomes flat for higher value of field in the case of the Starobinsky model. Moreover, the equation of state of the scalar field for the power-law model is always negative and less than -1/3, which corresponds to the behaviour of the dark energy that produces the accelerated expansion of the Universe. This is not always the case for the Starobinsky model. At late times Starobinsky model behaves as cosmological constant $Λ$ as behaves by power-law model for the values of $n\rightarrow 2$ at all times.
description: 10 pages, 8 figures
Barbell-shaped giant radio galaxy with ~100 kpc kink in the jet
Creators: name: Dabhade, Pratik
name: Shimwell, Timothy W.
name: Bagchi, Joydeep
name: Saikia, D. J.
name: Combes, Francoise
name: Gaikwad, Madhuri
name: Rottgering, Huub
name: Mohapatra, Abhisek
name: Ishwara-Chandra, C. H.
name: Intema, Huib T
name: Raychaudhury, Somak
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present for the first time a study of peculiar giant radio galaxy (GRG) J223301+131502 using deep multi-frequency radio observations from GMRT (323, 612, and 1300 MHz) and LOFAR (144 MHz) along with optical spectroscopic observations with the WHT~4.2m optical telescope. Our observations have firmly established its redshift of 0.09956 and unveiled its exceptional jet structure extending more than $\sim$ 200 kpc leading to a peculiar kink structure of $\sim$ 100 kpc. We measure the overall size of this GRG to be $\sim$ 1.83 Mpc; it exhibits lobes without any prominent hotspots and closely resembles a barbell. Our deep low-frequency radio maps clearly reveal the steep-spectrum diffuse emission from the lobes of the GRG. The magnetic field strength of $\sim$ 5 $μ$G and spectral ages between about 110 to 200 mega years for the radio lobes were estimated using radio data from LOFAR 144 MHz observations and GMRT 323 and 612 MHz observations. We discuss the possible causes leading to the formation of the observed kink feature for the GRG, which includes precession of the jet axis, development of instabilities and magnetic reconnection. Despite its enormous size, the Barbell GRG is found to be residing in a low-mass (M$_{200} \sim 10^{14}$ $\rm M_{\odot}$) galaxy cluster. This GRG with two-sided large-scale jets with a kink and diffuse outer lobes residing in a cluster environment provides an opportunity to explore the structure and growth of GRGs in different environments.
description: Accepted for publication in A&A. 17 Pages, 7 figures and 6 tables. Comments are welcome
Supernova search with active learning in ZTF DR3
Creators: name: Pruzhinskaya, Maria V.
name: Ishida, Emille E. O.
name: Novinskaya, Alexandra K.
name: Russeil, Etienne
name: Volnova, Alina A.
name: Malanchev, Konstantin L.
name: Kornilov, Matwey V.
name: Aleo, Patrick D.
name: Korolev, Vladimir S.
name: Krushinsky, Vadim V.
name: Sreejith, Sreevarsha
name: Gangler, Emmanuel
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: We provide the first results from the complete SNAD adaptive learning pipeline in the context of a broad scope of data from large-scale astronomical surveys. The main goal of this work is to explore the potential of adaptive learning techniques in application to big data sets. Our SNAD team used Active Anomaly Discovery (AAD) as a tool to search for new supernova (SN) candidates in the photometric data from the first 9.4 months of the Zwicky Transient Facility (ZTF) survey, namely, between March 17 and December 31 2018 (58194 < MJD < 58483). We analysed 70 ZTF fields at a high galactic latitude and visually inspected 2100 outliers. This resulted in 104 SN-like objects being found, 57 of which were reported to the Transient Name Server for the first time and with 47 having previously been mentioned in other catalogues, either as SNe with known types or as SN candidates. We visually inspected the multi-colour light curves of the non-catalogued transients and performed fittings with different supernova models to assign it to a probable photometric class: Ia, Ib/c, IIP, IIL, or IIn. Moreover, we also identified unreported slow-evolving transients that are good superluminous SN candidates, along with a few other non-catalogued objects, such as red dwarf flares and active galactic nuclei. Beyond confirming the effectiveness of human-machine integration underlying the AAD strategy, our results shed light on potential leaks in currently available pipelines. These findings can help avoid similar losses in future large-scale astronomical surveys. Furthermore, the algorithm enables direct searches of any type of data and based on any definition of an anomaly set by the expert.
description: 22 pages with appendix, 12 figures, 2 tables, accepted for publication in Astronomy and Astrophysics
Family Non-universal $Z^\prime$ Effects on $B_{d,s} \to K^{*0} {\overline K^{*0}}$ Decays in Perturbative QCD Approach
Creators: name: Li, Ying
name: Zhao, Guo-Hua
name: Sun, Yan-Jun
name: Zou, Zhi-Tian
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The nonleptonic decays $B_{d,s} \to K^{*0} {\overline K^{*0}}$ are reanalyzed in perturbative QCD approach, which is based on the $k_{\rm T}$ factorization. In the standard model, the calculated branching fraction and longitudinal polarization fraction of $B_{d} \to K^{*0} {\overline K^{*0}}$ are in agreement with experimental measurements, while the predictions of $B_{s} \to K^{*0} {\overline K^{*0}}$ cannot agree with data simultaneously. The parameter that combines of longitudinal polarization fractions and branching fractions evaluated to be $L_{K^*\overline{K}^{*0}}^{\rm PQCD}= 12.7^{+5.6} _{-3.2}$, which is also larger than that abstracted from experimental measurements. We then study all observables by introducing a family non-universal $Z^{\prime}$ boson in $b\to s q\bar q$ transitions. In order to reduce the number of new parameters, we simplify the model as possible. It is found that with the fixed value $ω_{B_s}=0.55$, these exists parameter space where all measurements, including the branching fraction, longitudinal polarization fraction and $L_{K^*\overline{K}^{*0}}$-parameter, could be accommodated simultaneously. All our results and the small parameter space could be further tested in the running LHC experiments, Belle-II and future high-energy colliders.
description: 21 pages, 6 figures
Multi-Grained Angle Representation for Remote Sensing Object Detection
Creators: name: Wang, Hao
name: Huang, Zhanchao
name: Chen, Zhengchao
name: Song, Ying
name: Li, Wei
Publisher: name: arXiv
Year: 2022
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: Arbitrary-oriented object detection (AOOD) plays a significant role for image understanding in remote sensing scenarios. The existing AOOD methods face the challenges of ambiguity and high costs in angle representation. To this end, a multi-grained angle representation (MGAR) method, consisting of coarse-grained angle classification (CAC) and fine-grained angle regression (FAR), is proposed. Specifically, the designed CAC avoids the ambiguity of angle prediction by discrete angular encoding (DAE) and reduces complexity by coarsening the granularity of DAE. Based on CAC, FAR is developed to refine the angle prediction with much lower costs than narrowing the granularity of DAE. Furthermore, an Intersection over Union (IoU) aware FAR-Loss (IFL) is designed to improve accuracy of angle prediction using an adaptive re-weighting mechanism guided by IoU. Extensive experiments are performed on several public remote sensing datasets, which demonstrate the effectiveness of the proposed MGAR. Moreover, experiments on embedded devices demonstrate that the proposed MGAR is also friendly for lightweight deployments.
description: 13 pages, 9 figures, 14 tables