cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Machine learning in nuclear materials research
Creators: name: Morgan, Dane
name: Pilania, Ghanshyam
name: Couet, Adrien
name: Uberuaga, Blas P.
name: Sun, Cheng
name: Li, Ju
Publisher: name: arXiv
Year: 2022
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Nuclear materials are often demanded to function for extended time in extreme environments, including high radiation fluxes and transmutation, high temperature and temperature gradients, stresses, and corrosive coolants. They also have a wide range of microstructural and chemical makeup, with multifaceted and often out-of-equilibrium interactions. Machine learning (ML) is increasingly being used to tackle these complex time-dependent interactions and aid researchers in developing models and making predictions, sometimes with better accuracy than traditional modeling that focuses on one or two parameters at a time. Conventional practices of acquiring new experimental data in nuclear materials research are often slow and expensive, limiting the opportunity for data-centric ML, but new methods are changing that paradigm. Here we review high-throughput computational and experimental data approaches, especially robotic experimentation and active learning that based on Gaussian process and Bayesian optimization. We show ML examples in structural materials ( e.g., reactor pressure vessel (RPV) alloys and radiation detecting scintillating materials) and highlight new techniques of high-throughput sample preparation and characterizations, and automated radiation/environmental exposures and real-time online diagnostics. This review suggests that ML models of material constitutive relations in plasticity, damage, and even electronic and optical responses to radiation are likely to become powerful tools as they develop. Finally, we speculate on how the recent trends in artificial intelligence (AI) and machine learning will soon make the utilization of ML techniques as commonplace as the spreadsheet curve-fitting practices of today.
open-access.network. Wie gestalten wir die Zukunft?
Creators: name: Benz, Martina
name: Kirchner, Andreas
name: Mikautsch, Emilia
name: Strauß, Helene
Publisher: name: Zenodo
Year: 2023
Subjects: Open Access

description: Das Poster "open-access.network. Wie gestalten wir die Zukunft?" wurde im Rahmen des BMBF-geförderten Projekts open.access-network erstellt und für die Open-Access-Tage 2023 angenommen. Das Poster skizziert den Weg zur Verstetigung des Kompetenz- und Vernetzungsportals open-access.network. Mit Blick auf das Ziel eines Community-basierten Organisations- und Finanzierungsmodells, wird aktiv zur Interaktion mit dem Poster sowie zur Ideen- und Meinungsäußerung zur Verstetigung eingeladen.
Bayesian Inference for Brain Activity from Functional Magnetic Resonance Imaging Collected at Two Spatial Resolutions
Creators: name: Whiteman, Andrew S.
name: Bartsch, Andreas J.
name: Kang, Jian
name: Johnson, Timothy D.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Methodology (stat.ME)
subject: Applications (stat.AP)
subject: FOS: Computer and information sciences

description: Neuroradiologists and neurosurgeons increasingly opt to use functional magnetic resonance imaging (fMRI) to map functionally relevant brain regions for noninvasive presurgical planning and intraoperative neuronavigation. This application requires a high degree of spatial accuracy, but the fMRI signal-to-noise ratio (SNR) decreases as spatial resolution increases. In practice, fMRI scans can be collected at multiple spatial resolutions, and it is of interest to make more accurate inference on brain activity by combining data with different resolutions. To this end, we develop a new Bayesian model to leverage both better anatomical precision in high resolution fMRI and higher SNR in standard resolution fMRI. We assign a Gaussian process prior to the mean intensity function and develop an efficient, scalable posterior computation algorithm to integrate both sources of data. We draw posterior samples using an algorithm analogous to Riemann manifold Hamiltonian Monte Carlo in an expanded parameter space. We illustrate our method in analysis of presurgical fMRI data, and show in simulation that it infers the mean intensity more accurately than alternatives that use either the high or standard resolution fMRI data alone.
description: 37 pages, 12 figures
title: The Polarity Paradigm. Phenomenological and Psychoanalytical Insights into the Subject
Creators: name: Brudzińska , Jagna
Publisher: name: Roma Tre-Press
Year: 2020

description: Concentrandosi sulla questione del conflitto come dimensione cruciale della natura umana e delle sue dinamiche, l’articolo intende collegare la ricerca fenomenologica all’approccio psicoanalitico. Su questa base, si vuole chiarire come la natura umana non possa essere spiegata attraverso uno schema causale rigoroso, bensì colta esplorando le strutture motivazionali dinamiche, espresse nelle ambivalenze e nei conflitti dell’esperienza umana intra- e intersoggettiva (mondo della vita). Il saggio sottolinea come il conflitto non sia una mera caratteristica aggiuntiva e accidentale dell’esperienza, che in qualche modo possa essere eliminata. Il conflitto, la polarità influiscono, piuttosto, sulla struttura fondamentale dell'esperienza personale e devono essere intesi come momenti costitutivi della natura umana. L’autrice intende, dunque, sostenere che sia l'esperienza di sé, sia lo sviluppo della comunità possono essere compresi solo alla luce dei conflitti motivazionali.

description: B@belonline vol. 6 New Phenomenological Horizons/Nuovi orizzonti fenomenologici
Statistics of phase fluctuations of an acoustic wave propagating through a turbulent flow
Creators: name: Prabhudesai, Gaurav
name: Perrard, Stephane
name: Petrelis, Francois
name: Fauve, Stephan
Publisher: name: arXiv
Year: 2022
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: We investigate the statistics of phase fluctuations of an acoustic wave propagating through a turbulent flow in line of sight (LOS) configuration. Experiments are performed on a closed von Karman swirling flow whose boundaries are maintained at a constant temperature. In particular, we analyze the root mean square (RMS) and the power spectrum density (PSD) of phase fluctuations. A model is developed and analytical predictions obtained for these quantities using geometrical acoustics are shown to be in agreement with experimental observations.
Hubble Space Telescope Far Ultraviolet Spectroscopy of the Recurrent Nova T Pyxidis
Creators: name: Godon, P.
name: Sion, E. M.
name: Starrfield, S.
name: Livio, M.
name: Williams, R. E.
name: Woodward, C. E.
name: Kuin, P.
name: Page, K. L.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: With six recorded nova outbursts, the prototypical recurrent nova T Pyxidis is the ideal cataclysmic variable system to assess the net change of the white dwarf mass within a nova cycle. Recent estimates of the mass ejected in the 2011 outburst ranged from a few 1.E-5 sollar mass to 3.3E-4 sollar mass, and assuming a mass accretion rate of 1.E-8 to 1.E-7 Sollar mass/yr for 44yrs, it has been concluded that the white dwaf in T Pyx is actually losing mass. Using NLTE disk modeling spectra to fit our recently obtained Hubble Space Telescope (HST) COS and STIS spectra, we find a mass accretion rate of up to two orders of magnitude larger than previously estimated. Our larger mass accretion rate is due mainly to the newly derived distance of T Pyx (4.8kpc; Sokoloski et al. 2013, larger than the previous 3.5kpc estimate), our derived reddening of E(B-V)=0.35 (based on combined IUE and GALEX spectra) and NLTE disk modeling (compared to black body and raw flux estimates in earlier works). We find that for most values of the reddening (0.25 < E(B-V) < 0.50) and white dwaf mass (0.70 to 1.35 Sollar mass) the accreted mass is larger than the ejected mass. Only for a low reddening (0.25 and smaller) combined with a large white dwaf mass (0.9 sollar mass and larger) is the ejected mass larger than the accreted one. However, the best spectral fitting results are obtained for a larger value of the reddening.
description: The Astrophysical Journal Letter, in press
Mixed-Membership of Experts Stochastic Blockmodel
Creators: name: White, Arthur
name: Murphy, Thomas Brendan
Publisher: name: arXiv
Year: 2014
Subjects: subject: Computation (stat.CO)
subject: Methodology (stat.ME)
subject: FOS: Computer and information sciences

description: Social network analysis is the study of how links between a set of actors are formed. Typically, it is believed that links are formed in a structured manner, which may be due to, for example, political or material incentives, and which often may not be directly observable. The stochastic blockmodel represents this structure using latent groups which exhibit different connective properties, so that conditional on the group membership of two actors, the probability of a link being formed between them is represented by a connectivity matrix. The mixed membership stochastic blockmodel (MMSBM) extends this model to allow actors membership to different groups, depending on the interaction in question, providing further flexibility. Attribute information can also play an important role in explaining network formation. Network models which do not explicitly incorporate covariate information require the analyst to compare fitted network models to additional attributes in a post-hoc manner. We introduce the mixed membership of experts stochastic blockmodel, an extension to the MMSBM which incorporates covariate actor information into the existing model. The method is illustrated with application to the Lazega Lawyers dataset. Model and variable selection methods are also discussed.
description: 32 pages, 8 figures
Wilson Lines off the Light-cone in TMD PDFs
Creators: name: Mulders, P. J.
name: Buffing, M. G. A.
Publisher: name: arXiv
Year: 2014
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: Transverse Momentum Dependent (TMD) parton distribution functions (PDFs) also take into account the transverse momentum ($p_T$) of the partons. The $p_T$-integrated analogues can be linked directly to quark and gluon matrix elements using the operator product expansion in QCD, involving operators of definite twist. TMDs also involve operators of higher twist, which are not suppressed by powers of the hard scale, however. Taking into account gauge links that no longer are along the light-cone, one finds that new distribution functions arise. They appear at leading order in the description of azimuthal asymmetries in high-energy scattering processes. In analogy to the collinear operator expansion, we define a universal set of TMDs of definite rank and point out the importance for phenomenology.
description: 12 pages, presented by the first author at the Light-Cone Conference 2013, May 20-24, 2013, Skiathos, Greece. To be published in Few Body Systems
The controversial early brightening in the first half of 20th century: a contribution from pyrheliometer measurements in Madrid (Spain)
Creators: name: Antón, M.
name: Vaquero, J. M.
name: Aparicio, A. J. P.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Atmospheric and Oceanic Physics (physics.ao-ph)
subject: FOS: Physical sciences

description: A long-term decrease in downward surface solar radiation from the 1950s to the 1980s ("global dimming") followed by a multi-decadal increase up to the present ("brightening") have been detected in many regions worldwide. In addition, some researchers have suggested the existence of an "early brightening" period in the first half of 20th century. However, this latter phenomenon is an open issue due to the opposite results found in literature and the scarcity of solar radiation data during this period. This paper contributes to this relevant discussion analyzing, for the first time in Southern Europe, the atmospheric column transparency derived from pyrheliometer measurements in Madrid (Spain) for the period 1911-1928. This time series is one of the three longest dataset during the first quarter of the 20th century in Europe. The results showed the great effects of the Katmai eruption (June 1912, Alaska) on transparency values during 1912-1913 with maximum relative anomalies around 8%. Outside the period affected by this volcano, the atmospheric transparency exhibited a stable behavior with a slight negative trend without any statistical significance on an annual and seasonal basis. Overall, there is no evidence of a possible early brightening period in direct solar radiation in Madrid. This phenomenon is currently an open issue and further research is needed using the few sites with available experimental records during the first half of the 20th century.
description: 19 pages, 1 figure, accepted for publication in "Global and Planetary Change"
Exascale Landau collision operator in the Cuda programming model applied to thermal quench plasmas
Creators: name: Adams, M. F.
name: Brennan, D. P.
name: Knepley, M. G.
name: Wang, P.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: Collisional processes are critical in the understanding of non-Maxwellian plasmas. The Landau form of the Fokker-Planck equation is the gold standard for modeling collisions in most plasmas, however O(N^2) work complexity inhibits its widespread use. We show that with advanced numerical methods and GPU hardware this cost can be effectively mitigated. This paper extends previous work on a conservative, high order accurate, finite element discretization with adaptive mesh refinement of the Landau operator, with extensions to GPU hardware and implementations in both the CUDA and Kokkos programming languages. This work focuses on the Landau kernels and on NVIDIA hardware, however preliminary results on AMD and Fujitsu/ARM hardware, as well as end-to-end performance of a velocity space model of a plasma thermal quench, are also presented. Both the fully implicit Landau time integrator and the plasma thermal quench model are publicly available in PETSc (Portable, Extensible, Toolkit for Scientific computing).
Certification Cycles of Train Cyber Gateway
Creators: name: Prochazka, Jan
name: Novobilsky, Petr
name: Prochazkova, Dana
name: Kertis, Tomas
Publisher: name: Zenodo
Year: 2020
Subjects: Multiple Independent Levels of Security
certification
cyber-physic system
railway
system of system
critical infrastructure protection

description: This presentation is a supplement to the paper "Certification Cycles of Train Cyber Gateway" presented at ESREL 2020 PSAM 15.
Prevalence of Malnutrition and Its Associated Factors among Adult People Living with HIV/AIDS receiving Anti Retroviral Therapy at Butajira Hospital, Southern Ethiopia
Creators: name: Dereje Gedle
Publisher: name: Zenodo
Year: 2014

description: Background: Malnutrition and HIV/AIDS are highly prevalent in Sub-Saharan Africa and they

are linked in a vicious cycle. Intestinal parasite co-infection worsens the effect of malnutrition

among HIV patients. However, the magnitude of malnutrition and its associated factors among

People Living with HIV/AIDS are not well understood at Butajira in particular and in Ethiopia in

general.

Objective: The aim of this study was to assess the prevalence of malnutrition and its associated

factors among Adult People Living with HIV/AIDS receiving ART.

Methods: Institution based cross-sectional study was conducted and systematic random

sampling technique was used to select study subjects. A total of 305 study subjects were enrolled

in the study. Structured and pre-tested questionnaire were used to collect socio-demographic,

clinical and nutritional related data. From each sampled patient, anthropometric and laboratory

data were collected. Both bivariate and multivariate logistic regression analyses were used to

assess the effect of the various factors on the level of malnutrition. P value ≤ 0.05 at 95% CI was

considered statistically significant
On the linearization of infinite-dimensional random dynamical systems
Creators: name: Backes, Lucas
name: Dragičević, Davor
Publisher: name: arXiv
Year: 2021
Subjects: subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics

description: We present a new version of the Grobman-Hartman's linearization theorem for random dynamics. Our result holds for infinite dimensional systems whose linear part is not necessarily invertible. In addition, by adding some restrictions on the non-linear perturbations, we don't require for the linear part to be nonuniformly hyperbolic in the sense of Pesin but rather (besides requiring the existence of stable and unstable directions) allow for the existence of a third (central) direction on which we don't prescribe any behaviour for the dynamics. Moreover, under some additional nonuniform growth condition, we prove that the conjugacies given by the linearization procedure are Hölder continuous when restricted to bounded subsets of the space.
description: Final version. Accepted for publication in Mathematische Nachrichten
Comparison of observing modes for statistical estimation of the 21cm signal from the Epoch of Reionisation
Creators: name: Trott, Cathryn M.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: (Abridged) Noise considerations for experiments that aim to statistically estimate the 21 cm signal from high redshift neutral hydrogen during the Epoch of Reionisation (EoR) using interferometric data are typically computed assuming a tracked observation, where the telescope pointing centre and instrument phase centre are the same over the observation. Current low frequency interferometers use aperture arrays of fixed dipoles, which are steered electronically on the sky, and have different properties to mechanically-steered single apertures, such as reduced sensitivity away from zenith, and discrete pointing positions on the sky. Use of two additional observing modes is encouraged: (1) zenith drift, where the pointing centre remains fixed at the zenith, and the phase centre tracks the sky, and (2) drift+shift, where the telescope uses discrete pointing centres, and the sky drifts during each pointing. The coherence of measurements in these modes dictates the optimal reduction in thermal noise by combination of coherent modes, and the reduction in cosmic variance by combination of incoherent modes (views of different patches of the sky). The balance between these noise components provides one measure for the utility of these three modes for measuring a statistical EoR signature. We provide a general framework for estimating the uncertainty in the power spectrum for a given observing mode, telescope beam shape, and antenna distribution. We apply this framework to the Murchison Widefield Array (MWA) using an analysis of the 2D and 1D power spectra for 900 hours of observing. We demonstrate that zenith drift scans can yield marginally lower uncertainty in the signal power compared with tracked scans for the MWA EoR experiment.
description: 11 pages, 8 figures. Accepted for publication in Proceedings of the Astronomical Society of Australia (PASA)
title: Ciò che è confuso e tuttavia più manifesto. Osservazioni sul concetto di fenomeno a partire da Husserl
Creators: name: Deodati , Marco
Publisher: name: Roma Tre-Press
Year: 2020

description: Il saggio vuole contribuire a chiarire alcuni aspetti relativi al concetto di fenomeno prendendo le mosse dalla riflessione husserliana, nella quale tale nozione presenta una notevole complessità di lettura. In prima battuta si intende ricostruire i passaggi fondamentali attraverso cui Husserl, dopo la prima edizione delle Ricerche logiche, giunge a concepire il fenomeno nel doppio senso di manifestazione e cosa manifesta. In secondo luogo, si vuole evidenziare che la costitutiva coappartenenza di queste due dimensioni permette di leggere il cosiddetto mondo-della-vita in termini di mondo della doxa, cioè di quelle esperienze soggettivo-relative nelle quali è in ultima analisi radicata ogni possibile donazione di senso.

description: B@belonline vol. 6 New Phenomenological Horizons/Nuovi orizzonti fenomenologici
Weinberg and few-nucleon forces
Creators: name: van Kolck, U.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Weinberg's contributions to the power counting and derivation of few-nucleon forces in Chiral EFT are briefly recalled. Subsequent improvements are reviewed, concluding with the recent suggestion of a combinatorial enhancement.
description: 7 pages. Invited talk at the XLIV Reuniao de Trabalho sobre Fisica Nuclear no Brasil, November 2021
Warm-Intermediate Inflationary Universe Model with Viscous Pressure in High Dissipative Regime
Creators: name: Setare, M. R.
name: Kamali, V.
Publisher: name: arXiv
Year: 2014
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: Warm inflation model with bulk viscous pressure in the context of "intermediate inflation" where the cosmological scale factor expands as $a(t)=a_0\exp(At^f)$, is studied. The characteristics of this model in slow-roll approximation and in high dissipative regime are presented in two cases: 1- Dissipative parameter $Γ$ as a function of scalar field $ϕ$ and bulk viscous coefficient $ζ$ as a function of energy density $ρ$. 2- $Γ$ and $ζ$ are constant parameters. Scalar, tensor perturbations and spectral indices for this scenario are obtained. The cosmological parameters appearing in the present model are constrained by recent observational data (WMAP7).
description: 17 pages, 4 figures, accepted for publication in General Relativity and Gravitation. arXiv admin note: substantial text overlap with arXiv:1312.2832, arXiv:1302.0493
title: La realtà presuntiva del mondo. La questione della Welt nelle Idee per una fenomenologia pura
Creators: name: Carroccio , Andrea
Publisher: name: Roma Tre-Press
Year: 2020

description: Questo articolo vuole essere una lettura del concetto di mondo nel primo libro delle Idee per una fenomenologia pura e nella Crisi delle scienze europee di Husserl. In queste pagine, seguiremo lo sviluppo di tale concetto a partire dall’atteggiamento naturale fino a quello fenomenologico. L’obiettivo di questa ricerca è sottolineare il paradosso del mondo come contenuto di coscienza: da un lato, nell’atteggiamento naturale il mondo appare come fondamento esistente di ogni coscienza individuale; dall’altro, la coscienza è il fondamento del mondo in quanto fenomeno.

description: B@belonline vol. 6 New Phenomenological Horizons/Nuovi orizzonti fenomenologici
The Impact of Network Connectivity on Collective Learning
Creators: name: Crosscombe, Michael
name: Lawry, Jonathan
Publisher: name: arXiv
Year: 2021
Subjects: subject: Multiagent Systems (cs.MA)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: In decentralised autonomous systems it is the interactions between individual agents which govern the collective behaviours of the system. These local-level interactions are themselves often governed by an underlying network structure. These networks are particularly important for collective learning and decision-making whereby agents must gather evidence from their environment and propagate this information to other agents in the system. Models for collective behaviours may often rely upon the assumption of total connectivity between agents to provide effective information sharing within the system, but this assumption may be ill-advised. In this paper we investigate the impact that the underlying network has on performance in the context of collective learning. Through simulations we study small-world networks with varying levels of connectivity and randomness and conclude that totally-connected networks result in higher average error when compared to networks with less connectivity. Furthermore, we show that networks of high regularity outperform networks with increasing levels of random connectivity.
description: 13 pages, 5 figures. To appear at the 15th International Symposium on Distributed Autonomous Robotic Systems 2021. Presented at the joint DARS-SWARM 2021 symposium held (virtually) in Kyoto, Japan
The radiation environment in a Low Earth Orbit: the case of BeppoSAX
Creators: name: Campana, R.
name: Orlandini, M.
name: Del Monte, E.
name: Feroci, M.
name: Frontera, F.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Geophysics (physics.geo-ph)
subject: FOS: Physical sciences

description: Low-inclination, low altitude Earth orbits (LEO) are of increasing importance for astrophysical satellites, due to their low background environment. Here, the South Atlantic Anomaly (SAA) is the region with the highest amount of radiation. We study the radiation environment in a LEO (500-600 km altitude, 4 degrees inclination) through the particle background measured by the Particle Monitor (PM) experiment onboard the BeppoSAX satellite, between 1996 and 2002. Using time series of particle count rates measured by PM we construct intensity maps and derive SAA passage times and fluences. The low-latitude SAA regions are found to have an intensity strongly decreasing with altitude and dependent on the magnetic rigidity. The SAA extent, westward drift and strength vs altitude is shown.
description: 16 pages, 12 figures. Accepted for publication in Experimental Astronomy
title: Die Mathematisierung der Natur als intentionalhistorisches Problem In Husserls Krisis-Schrift
Creators: name: Dojan , Thomas
Publisher: name: Roma Tre-Press
Year: 2020

description: Questo articolo rappresenta un contributo fenomenologico agli studi genetico-filosofici della scienza interpretata come risultato storico-culturale collettivo, ma anche come impegno a raggiungere una conoscenza oggettiva e valida in modo assoluto. Nella Crisi delle scienze europee (1936), Edmund Husserl mira a sviluppare una comprensione storica delle motivazioni che hanno dato origine al naturalismo. Nel saggio si ripercorrono le analisi presenti nella Crisi, distinguendo tre grandi sezioni: (i) si dà conto delle riflessioni storiche nella fenomenologia di Edmund Husserl in generale (essenza storica della coscienza); (ii) si presenta e si interpreta la storia intenzionale della scienza naturale utilizzando il § 9 della Crisi (le categorie della pratica scientifica, causalità e idealità, sono ricondotte alla loro dimensione pre-categoriale); e (iii) si mettono in evidenza le critiche di Husserl alla naturalizzazione della psiche.

description: B@belonline vol. 6 New Phenomenological Horizons/Nuovi orizzonti fenomenologici
Electronic Properties of Pyrochlore-Type Ca2Ir2O7
Creators: name: Nakayama, Yuki
name: Okamoto, Yoshihiko
name: Hirai, Daigorou
name: Takenaka, Koshi
Publisher: name: arXiv
Year: 2022
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The electrical resistivity, magnetic susceptibility, and heat capacity of sintered samples of Ca2Ir2O7, in which pentavalent Ir atoms with 5d4 electron configuration form a pyrochlore structure, have been studied. The obtained experimental data strongly suggest that Ca2Ir2O7 is metallic below room temperature and exhibits no electronic or magnetic phase transitions above 0.12 K.
description: 3 pages, 3 figures
title: Déconstruire Hegel, un geste phénoménologique? Sur Glas de Jacques Derrida
Creators: name: Baptist , Gabriella
Publisher: name: Roma Tre-Press
Year: 2020

description: Il saggio propone di leggere secondo una prospettiva fenomenologica Glas di Jacques Derrida, opera enigmatica del 1974 che ancora attende di essere valorizzata adeguatamente dagli studiosi. L’approccio di Derrida a Hegel è attraversato infatti, fin dai saggi degli anni ’60, dal riferimento diretto e indiretto a quelle interpretazioni hegeliane che hanno caratterizzato il panorama filosofico francese del ’900, profondamente influenzato dalla tradizione della fenomenologia del tempo. Jean-Paul Sartre e Georges Bataille risultano gli interlocutori privilegiati allorché  si tratta, in particolare, di affrontare l’aporia rappresentata dai fiori, inassimilabili dalla dialettica, non riducibili a puri e semplici effetti retorici, fenomenologicamente imprendibili.

description: B@belonline vol. 6 New Phenomenological Horizons/Nuovi orizzonti fenomenologici
Rigidity and unlikely intersections for stable $p$-adic dynamical systems
Creators: name: Sarkar, Mabud Ali
name: Shaikh, Absos Ali
Publisher: name: arXiv
Year: 2021
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11S82~(11S31, ~11F85, ~13J05, ~37P35)

description: Berger asked the question \enquote{To what extent the preperiodic points of a stable $p$-adic power series determines a stable $p$-adic dynamical system} ? In this work we have applied the preperiodic points of a stable $p$-adic power series in order to determine the corresponding stable $p$-adic dynamical system.
description: 10 pages, comments are welcomed
Automatic classification of time-variable X-ray sources
Creators: name: Lo, Kitty K.
name: Farrell, Sean
name: Murphy, Tara
name: Gaensler, B. M.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: To maximize the discovery potential of future synoptic surveys, especially in the field of transient science, it will be necessary to use automatic classification to identify some of the astronomical sources. The data mining technique of supervised classification is suitable for this problem. Here, we present a supervised learning method to automatically classify variable X-ray sources in the second \textit{XMM-Newton} serendipitous source catalog (2XMMi-DR2). Random Forest is our classifier of choice since it is one of the most accurate learning algorithms available. Our training set consists of 873 variable sources and their features are derived from time series, spectra, and other multi-wavelength contextual information. The 10-fold cross validation accuracy of the training data is ${\sim}$97% on a seven-class data set. We applied the trained classification model to 411 unknown variable 2XMM sources to produce a probabilistically classified catalog. Using the classification margin and the Random Forest derived outlier measure, we identified 12 anomalous sources, of which, 2XMM J180658.7$-$500250 appears to be the most unusual source in the sample. Its X-ray spectra is suggestive of a ULX but its variability makes it highly unusual. Machine-learned classification and anomaly detection will facilitate scientific discoveries in the era of all-sky surveys.
description: Accepted for ApJ
Existence and Uniqueness of Exact WKB Solutions for Second-Order Singularly Perturbed Linear ODEs
Creators: name: Nikolaev, Nikita
Publisher: name: arXiv
Year: 2021
Subjects: subject: Analysis of PDEs (math.AP)
subject: Mathematical Physics (math-ph)
subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 34M60, 34E10, 34E20, 40G10, 34M03, 34M25

description: We prove an existence and uniqueness theorem for exact WKB solutions of general singularly perturbed linear second-order ODEs in the complex domain. These include the one-dimensional time-independent complex Schrödinger equation. Notably, our results are valid both in the case of generic WKB trajectories as well as closed WKB trajectories. We also explain in what sense exact and formal WKB solutions form a basis. As a corollary of the proof, we establish the Borel summability of formal WKB solutions for a large class of problems, and derive an explicit formula for the Borel transform.
description: Minor changes: fixed some typos, updated references. arXiv admin note: text overlap with arXiv:2008.06492
Two-step nilpotent Leibniz algebras
Creators: name: Mancini, Manuel
name: La Rosa, Gianmarco
Publisher: name: arXiv
Year: 2021
Subjects: subject: Rings and Algebras (math.RA)
subject: FOS: Mathematics
subject: 17A32, 22A30, 20M99

description: In this paper we give a complete classification of two-step nilpotent Leibniz algebras in terms of Kronecker modules associated with pairs of bilinear forms. In particular, we describe the complex and the real case of the indecomposable Heisenberg Leibniz algebras as a generalization of the classical $(2n+1)-$dimensional Heisenberg Lie algebra $\mathfrak{h}_{2n+1}$. Then we use the Leibniz algebras - Lie local racks correspondence proposed by S. Covez to show that nilpotent real Leibniz algebras have always a global integration. As an application, we integrate the indecomposable nilpotent real Leibniz algebras with one-dimensional commutator ideal. We also show that every Lie quandle integrating a Leibniz algebra is induced by the conjugation of a Lie group and the Leibniz algebra is the Lie algebra of that Lie group.
description: Final version, accepted for publication
Modification of the Bloch law in ferromagnetic nanostructures
Creators: name: Cojocaru, S.
name: Naddeo, A.
name: Citro, R.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The temperature dependence of magnetization in ferromagnetic nanostructures (e.g., nanoparticles or nanoclusters) is usually analyzed by means of an empirical extension of the Bloch law sufficiently flexible for a good fitting to the observed data and indicates a strong softening of magnetic coupling compared to the bulk material. We analytically derive a microscopic generalization of the Bloch law for the Heisenberg spin model which takes into account the effects of size, shape and various surface boundary conditions. The result establishes explicit connection to the microscopic parameters and differs significantly from the existing description. In particular, we show with a specific example that the latter may be misleading and grossly overestimates magnetic softening in nanoparticles. It becomes clear why the usual $T^{3/2}$ dependence appears to be valid in some nanostructures, while large deviations are a general rule. We demonstrate that combination of geometrical characteristics and coupling to environment can be used to efficiently control magnetization and, in particular, to reach a magnetization higher than in the bulk material.
description: 7 pages, 4 figures
Canonical Quantization of the BTZ Black Hole using Noether Symmetries
Creators: name: Christodoulakis, T.
name: Dimakis, N.
name: Terzis, Petros A.
name: Doulis, G.
Publisher: name: arXiv
Year: 2014
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The well-known BTZ black hole solution of (2+1) Einstein's gravity, in the presence of a cosmological constant, is treated both at the classical and quantum level. Classically, the imposition of the two manifest local Killing fields of the BTZ geometry at the level of the full action results in a mini-superspace constraint action with the radial coordinate playing the role of the independent dynamical variable. The Noether symmetries of this reduced action are then shown to completely determine the classical solution space, without any further need to solve the dynamical equations of motion. At a quantum mechanical level, all the admissible sets of the quantum counterparts of the generators of the above mentioned symmetries are utilized as supplementary conditions acting on the wave-function. These additional restrictions, in conjunction with the Wheeler-DeWitt equation, help to determine (up to constants) the wave-function which is then treated semiclassically, in the sense of Bohm. The ensuing space-times are, either identical to the classical geometry, thus exhibiting a good correlation of the corresponding quantization to the classical theory, or are less symmetric but exhibit no Killing or event horizon and no curvature singularity, thus indicating a softening of the classical conical singularity of the BTZ geometry.
description: 24 pages, no figures, LaTeX 2e source file
title: Lévinas e il metodo fenomenologico
Creators: name: Carbone , Guelfo
Publisher: name: Roma Tre-Press
Year: 2020

description: Nell’etica di Levinas, tanto l’egologia trascendentale husserliana, quanto l’ontologia fondamentale di Heidegger sono chiamate in causa da una critica radicale che, attraverso una particolare riappropriazione del metodo fenomenologico, mira all’impianto stesso del pensiero filosofico e scientifico occidentale. Il presente contributo delinea il contesto in cui, assumendo il metodo fenomenologico per andare oltre la fenomenologia, Lévinas prosegue la radicalizzazione husserliana del metodo cartesiano, approfondendo un solco già tracciato da Heidegger.

description: B@belonline vol. 6 New Phenomenological Horizons/Nuovi orizzonti fenomenologici
RZA-NLMF algorithm based adaptive sparse sensing for realizing compressive sensing problems
Creators: name: Gui, Guan
name: Xu, Li
name: Adachi, Fumiyuki
Publisher: name: arXiv
Year: 2014
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: Nonlinear sparse sensing (NSS) techniques have been adopted for realizing compressive sensing in many applications such as Radar imaging. Unlike the NSS, in this paper, we propose an adaptive sparse sensing (ASS) approach using reweighted zero-attracting normalized least mean fourth (RZA-NLMF) algorithm which depends on several given parameters, i.e., reweighted factor, regularization parameter and initial step-size. First, based on the independent assumption, Cramer Rao lower bound (CRLB) is derived as for the trademark of performance comparisons. In addition, reweighted factor selection method is proposed for achieving robust estimation performance. Finally, to verify the algorithm, Monte Carlo based computer simulations are given to show that the ASS achieves much better mean square error (MSE) performance than the NSS.
description: 15 pages, 9 figures, submitted for journal
MEASURING MICRO AND MACRO UNCERTAINTY
Creators: name: Liu, Yang
Publisher: name: American University
Year: 2023

description: This dissertation aims at building alternative measures of economic uncertainty from micro data. The resulting panel measurements enable investigations of real uncertainty effects at the individual, firm, industry, and macro level. Two uncertainty models are introduced to demonstrate additional channels through which uncertainty poses impacts on economic activities. In the first chapter, I propose a novel firm-level uncertainty measure based on the latent conditional volatility of forecast errors. By applying this measure to I/B/E/S database, I track 1,916 U.S. public companies' uncertainties for over 34 years. The firm-level measurements are then aggregated into a macro uncertainty index and the implications at the macro- and micro-level are compared. At the macro level, VAR results indicate a strong "granular origin'' of real uncertainty effects from large firms in addition to the classical short-lived "drop and rebound'' effect. At the firm level, panel regression results confirm the negative impact of macro uncertainty on firm investment and reveal a composite effect of idiosyncratic uncertainty that depends on investment horizon, firm profitability and magnitude of shock (Empirical results are also shown in Chapter 2).The second chapter introduces two uncertainty models that show channels other than "real option'' and "risk aversion & risk premia'' in contemporary literature. The first model is based on Lucas Island Model and Capital Asset Pricing Model (CAPM). It tries to understand the uncertainty effects from the perspective of inefficient expectation and the resulting underproduction problem. The second model inherits New-Keynesian assumptions and features a competition mechanism. It emphasizes the real loss from unexpected supply and demand shocks. Both models include idiosyncratic and macro uncertainty as separate factors and predict a generally negative impact of macro uncertainty versus a composite effect of idiosyncratic uncertainty. In the third chapter, I propose a new measure of macroeconomic uncertainty that incorporates rich information set from U.S. SPF density forecasts. The measure has two key advantages over traditional measures: (i) it reflects the subjective perceptions of market participants; (ii) it is an ex-ante measure that does not require the knowledge of realized outcomes. I study the features of this measure of macroeconomic uncertainty and explore its impact on real economic activities within the U.S. as well as its spillover effects on BRIC countries.The Appendix discusses the methodology used in Chapter 3.
MPEC 2023-E16 : 2023 DX1
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2023
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2023 DX1

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
High-resolution abundance analysis of very metal-poor r-I stars
Creators: name: Siqueira-Mello, C.
name: Hill, V.
name: Barbuy, B.
name: Spite, M.
name: Spite, F.
name: Beers, T. C.
name: Caffau, E.
name: Bonifacio, P.
name: Cayrel, R.
name: François, P.
name: Schatz, H.
name: Wanajo, S.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Moderately r-process-enriched stars (r-I) are at least four times as common as those that are greatly enriched in r-process elements (r-II), and the abundances in their atmospheres are important tools for obtaining a better understanding of the nucleosynthesis processes responsible for the origin of the elements beyond the iron peak. The main aim of this work is to derive abundances for a sample of seven metal-poor stars with classified as r-I stars, to understand the role of these stars for constraining the astrophysical nucleosynthesis event(s) that is(are) responsible for the production of the r-process, and to investigate whether they differ, in any significant way, from the r-II stars. We carried out a detailed abundance analysis based on high-resolution spectra obtained with the VLT/UVES spectrograph. The OSMARCS LTE 1D model atmosphere grid was employed, along with the spectrum synthesis code Turbospectrum. We have derived abundances of light elements Li, C, and N, alpha-elements, odd-Z elements, iron-peak elements, and the trans-iron elements from the first peak, the second peak, the third peak, and the actinides regions. The results are compared with values for these elements for r-II and normal very and extremely metal-poor stars reported in the literature, ages based on radioactive chronometry are explored using different models, and a number of conclusions about the r-process and the r-I stars are presented. Hydrodynamical models were used for some elements, and general behaviors for the 3D corrections were presented.
description: 24 pages, 31 figures, accepted by A&A
Origin of the asymmetric exchange bias in BiFeO$_3$-Bi$_2$Fe$_4$O$_9$ nanocomposite
Creators: name: Maity, Tuhin
name: Goswami, Sudipta
name: Bhattacharya, Dipten
name: Roy, Saibal
Publisher: name: arXiv
Year: 2014
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We show from detailed magnetometry across 2-300 K that the BiFeO$_3$-Bi$_2$Fe$_4$O$_9$ nanocomposite offers a unique spin morphology where superspin glass (SSG) and dilute antiferromagnet in a field (DAFF) coexist at the interface between ferromagnetic Bi$_2$Fe$_4$O$_9$ and antiferromagnetic BiFeO$_3$. The coexisting SSG and DAFF combine to form a local spin texture which gives rise to a path-dependent exchange bias below the spin freezing temperature ($\sim$29K). The exchange bias varies depending on the protocol or path followed in tracing the hysteresis loop. The exchange bias has been observed below blocking temperature (T$_B$$\sim$60K) of the superparamagnetic Bi$_2$Fe$_4$O$_9$. The conventional exchange bias (CEB) increases nonmonotonically as temperature decreases. The magnitude of both exchange bias (H$_E$) and coercivity (H$_C$) increase with decrease in temperature and are found to be asymmetric below 20K depending on the path followed in tracing the hysteresis loop and bias field. The local spin texture at the interface between ferromagnetic and antiferromagnetic particles generates a nonswitchable unidirectional anisotropy along the negative direction of the applied field. The influence of this texture also shows up in "asymmetric" jumps in the hysteresis loop at 2 K which smears off at higher temperature. The role of the interface spin texture in yielding the path dependency of exchange bias is thus clearly delineated.
description: 6 pages with 4 embedded figures, published in Phys. Rev. B Rapid Comm
title: Mondo e totalità. L’approccio fenomenologico di Heidegger e Lukács
Creators: name: Mancini , Federico
Publisher: name: Roma Tre-Press
Year: 2020

description: Il saggio propone un confronto teorico tra due fondamentali opere del Novecento, Essere e Tempo di Martin Heidegger e Storia e coscienza di classe di György Lukács. Andando oltre la radicale diversità filosofica che li ha posti agli antipodi e ponendo a confronto alcune formulazioni teoriche portanti, quali il concetto heideggeriano di In-der-Welt-sein e le teorie lukácsiane sulla totalità e la coscienza di classe, si è cercato di far emergere un comune approccio di derivazione fenomenologica che portò entrambi a ridefinire le strutture della soggettività, tanto individuale quanto collettiva, attraverso una decostruzione paradigmatica del rapporto soggetto-oggetto.

description: B@belonline vol. 6 New Phenomenological Horizons/Nuovi orizzonti fenomenologici
Highlight report: Necrosis-apoptosis conundrum of hepatocytes: mode of hepatocyte death after acetaminophen intoxication
Creators: name: Ghallab, Ahmed
Publisher: name: IfADo - Leibniz Research Centre for Working Environment and Human Factors, Dortmund
Year: 2018

description: EXCLI Journal; 17:Doc1191; ISSN 1611-2156
MANUFACTURING LABS: WHERE NEW DIGITAL TECHNOLOGIES HELP IMPROVE LIFE QUALITY
Creators: name: Bravi, Laura
name: Murmura, Federica
name: Santos, Gilberto
Publisher: name: Center for Quality
Year: 2018
Subjects: Fabrication Laboratories
Industry 4.0
Digital technologies
Additive Manufacturing

description: International Journal for Quality Research; Vol 12, No 4, 2018. ISSN 1800-6450
description: The aim of this paper is to analyze where Do It Yourself (DIY) comes to life, investigating the economic reality of Italian Fabrication Laboratories, an international network of digital laboratories which provide a space with new technologies tools for digital manufacturing, identifying their role both towards consumers and businesses in the Industry 4.0 era, with the purpose of helping to improve the quality of life. Data from Italian Fab Labs were collected using a questionnaire survey; 27 Fab Labs participated to the survey. The results show that, while some laboratories are still in an embryonic phase, with no or very few registered users, others are in full activity reaching over 100 users. Italian laboratories are characterized by ample space available, but limited capacity for investment in machinery and technology. The role of Fab Labs in the Italian economic panorama could be double, and affect the consumer side, transforming consumers in “co-designers” of products, and on the other side, helping businesses designing and building prototypes to improve products 'quality.