cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Improved Sample Complexity Bounds for Distributionally Robust Reinforcement Learning
Creators: name: Xu, Zaiyan
name: Panaganti, Kishan
name: Kalathil, Dileep
Publisher: name: arXiv
Year: 2023
Subjects: subject: Machine Learning (cs.LG)
subject: Artificial Intelligence (cs.AI)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences

description: We consider the problem of learning a control policy that is robust against the parameter mismatches between the training environment and testing environment. We formulate this as a distributionally robust reinforcement learning (DR-RL) problem where the objective is to learn the policy which maximizes the value function against the worst possible stochastic model of the environment in an uncertainty set. We focus on the tabular episodic learning setting where the algorithm has access to a generative model of the nominal (training) environment around which the uncertainty set is defined. We propose the Robust Phased Value Learning (RPVL) algorithm to solve this problem for the uncertainty sets specified by four different divergences: total variation, chi-square, Kullback-Leibler, and Wasserstein. We show that our algorithm achieves $\tilde{\mathcal{O}}(|\mathcal{S}||\mathcal{A}| H^{5})$ sample complexity, which is uniformly better than the existing results by a factor of $|\mathcal{S}|$, where $|\mathcal{S}|$ is number of states, $|\mathcal{A}|$ is the number of actions, and $H$ is the horizon length. We also provide the first-ever sample complexity result for the Wasserstein uncertainty set. Finally, we demonstrate the performance of our algorithm using simulation experiments.
description: Appeared in AISTATS 2023
title: Ð¡Ð¾Ð²ÐµÑÑÐµÐ½ÑÑÐ²Ð¾Ð²Ð°Ð½Ð¸Ðµ ÑÐ¸ÑÑÐµÐ¼Ñ ÑÑÐ¸Ð¼ÑÐ»Ð¸ÑÐ¾Ð²Ð°Ð½Ð¸Ñ Ð¿ÐµÑÑÐ¾Ð½Ð°Ð»Ð° ÐºÐ°Ðº Ð¸Ð½ÑÑÑÑÐ¼ÐµÐ½Ñ Ð¿Ð¾Ð²ÑÑÐµÐ½Ð¸Ñ ÐºÐ°ÑÐµÑÑÐ²Ð° Ð³Ð¾ÑÑÐ¸Ð½Ð¸ÑÐ½ÑÑ ÑÑÐ»ÑÐ³ (Ð½Ð° Ð¿ÑÐ¸Ð¼ÐµÑÐµ ÐÐÐ Â«Belmond Grand Hotel EuropeÂ»)
title: Ð²ÑÐ¿ÑÑÐºÐ½Ð°Ñ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð°Ñ ÑÐ°Ð±Ð¾ÑÐ° Ð±Ð°ÐºÐ°Ð»Ð°Ð²ÑÐ°
titleType: Subtitle
Creators: name: Ð¨Ð°Ð»Ð°ÐµÐ²Ð°, ÐÐ°ÑÐ°Ð»ÑÑ
Publisher: name: Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¸Ð¹ Ð¿Ð¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹ ÑÐ½Ð¸Ð²ÐµÑÑÐ¸ÑÐµÑ ÐÐµÑÑÐ° ÐÐµÐ»Ð¸ÐºÐ¾Ð³Ð¾
Year: 2018
Subjects: ÑÑÐ¸Ð¼ÑÐ»Ð¸ÑÐ¾Ð²Ð°Ð½Ð¸Ðµ Ð¿ÐµÑÑÐ¾Ð½Ð°Ð»Ð°
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description: Ð¦ÐµÐ»Ñ Ð¸ÑÑÐ»ÐµÐ´Ð¾Ð²Ð°Ð½Ð¸Ñ â ÑÐ¾Ð²ÐµÑÑÐµÐ½ÑÑÐ²Ð¾Ð²Ð°Ð½Ð¸Ðµ ÑÐ¸ÑÑÐµÐ¼Ñ ÑÑÐ¸Ð¼ÑÐ»Ð¸ÑÐ¾Ð²Ð°Ð½Ð¸Ñ ÑÑÑÐ´Ð° Ð¿ÐµÑÑÐ¾Ð½Ð°Ð»Ð° Ð½Ð° Ð¿ÑÐ¸Ð¼ÐµÑÐµ Ð¾ÑÐµÐ»Ñ Â«Belmond Grand Hotel EuropeÂ».
ÐÐ±ÑÐµÐºÑ Ð¸ÑÑÐ»ÐµÐ´Ð¾Ð²Ð°Ð½Ð¸Ñ â Ð³Ð¾ÑÑÐ¸Ð½Ð¸ÑÐ° Â«Belmond Grand Hotel EuropeÂ».
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Cinque nuovi pianeti rocciosi per Kepler
Creators: Eleonora Ferroni
Publisher: name: Media Inaf
Year: 2014

Lanciata nel 2009, la sonda della NASA va a caccia di pianeti simili alla Terra nella Via Lattea. Di 3500 candidati 208 pianeti sono già stati confermati. Di recente ne sono stati scoperti cinque, due dei quali sono di gran lunga più grandi del nostro pianeta. I dati in un convegno dell'American Astronomical Society a Washington.
title: A comparison of the meridional meandering of extratropical precipitation during boreal winter: eddy momentum flux versus Eulerian storm tracks
Creators: name: Yoo, Changhyun
name: Jin, Daeho
name: Lee, Sukyoung
name: Kim, Daehyun
Publisher: name: Springer Nature
Year: 2025
Subjects: subject: Atmospheric dynamics
subject: Atmospheric science

description: The latitudinal distribution of winter extratropical precipitation is often regarded as being determined by the location and intensity of the storm track. Here, we compare the precipitation variability associated with the meridional eddy momentum flux (EMF) with that associated with an Eulerian storm track measure. Observations show that when the midlatitude EMF is anomalously poleward, the occurrence of moderate-to-heavy precipitation (1–33?mm day-1) increases between 45°N and 70°N, while decreasing between 25°N and 45°N. This shift occurs mostly downstream of the climatological storm track maximum, with generally greater precipitation anomalies compared to those associated with storm track changes. The shift is tied to changes in horizontal moisture transport primarily by planetary scale waves. These results suggest that, in addition to the storm track intensity, dynamics of the horizontal wave tilts which affect the EMF intensity need to be considered when projecting future changes in precipitation variability.
The geology and ore deposits of the Summit Camp, Boundary District, British Columbia
Creators: name: Carswell, Henry Thomas
Publisher: name: University of British Columbia
Year: 2012

description: The Summit Camp, now abandoned, is located seven miles north of the town of Greenwood in south-central British Columbia. Mineral deposits in skarn zones of the camp were mined for their copper, gold, and silver values. The oldest rocks in the Summit Camp are the contorted grey cherts of the Knob Hill Formation of Paleozoic (?) age. The Knob Hill Formation is overlain nonconformably by the Paleozoic Attwood Series, made up of the shales of the basal Rawhide Formation; the limestones, chert breccia, and limestone breccia of the Brooklyn Formation; and the pyroclastics, lavas, and greenstones of the Eholt Formation. The chert and limestone breccias of the Brooklyn Formation, interpreted by some earlier workers as the results of silicification and tectonic brecciation respectively, are considered to be of clastic sedimentary origin. There is a pronounced nonconformity between the Brooklyn and Eholt Formations. These sedimentary rocks were intruded in Mesozoic (?) time by the Emma Intrusive consisting of quartz diorite, diorite and minor gabbro. This event was followed by the emplacement of the Lion Creek Intrusive, which consists of quartz diorite and syenite. In Oligocene time the arkoses of the Kettle River Formation were deposited in fresh-water basins in the area. Earlier rocks were intruded by Miocene (?) phonolite and pulaskite, that also gave rise to flows of similar composition. Miocene (?) basic dikes are the latest rocks of the area. Mineral deposits of the camp contain magnetite, pyrite, pyrrhotite, chalcopyrite and tetrahedrite in a gangue of skarn minerals. Skarn has formed from Brooklyn limestone as a result of the addition of heat and large amounts of Si, Al, and Fe⁺⁺⁺ from the Lion Creek Intrusive. The intrusive assimilated large amounts of Ca and CO₂ in the process. Skarn zones are controlled by proximity to the Lion Creek stock, or by a contact of limestone with other rocks, or by the presence of channelways such as faults or permeable beds. Metallic minerals were introduced into the skarn zones along fractures and foliation planes with falling temperature. Epithermal precious metal veins that occur close to the Mesozoic (?) intrusives of the Boundary District are not found in limestone. It is believed that these veins were emplaced during a late stage in the cooling of the plutonic rocks. The earlier, higher temperature release of metals into the skarn deposits may be the result of the assimilation of CO₂ that locally prevented the solidification of the shell of the consolidated intrusive body. The mineralizing fluids responsible for the epithermal veins were trapped within the shell and released at a late stage by fracturing due to cooling.
Il «nano» gassoso
Creators: Marco Malaspina
Publisher: name: Media Inaf
Year: 2014

Si chiama KOI-314c, si trova a 200 anni luce da noi ed è il più leggero fra tutti i pianeti extrasolari di cui si abbia una misura sia della massa che delle dimensioni. La sua densità è appena del 30 percento superiore a quella dell’acqua, ed è stato scoperto setacciando i dati di Kepler a caccia di esolune.
Jammed frictionless discs: connecting local and global response
Creators: name: Ellenbroek, Wouter G.
name: van Hecke, Martin
name: van Saarloos, Wim
Publisher: name: arXiv
Year: 2009
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: By calculating the linear response of packings of soft frictionless discs to quasistatic external perturbations, we investigate the critical scaling behavior of their elastic properties and non-affine deformations as a function of the distance to jamming. Averaged over an ensemble of similar packings, these systems are well described by elasticity, while in single packings we determine a diverging length scale $\ell^*$ up to which the response of the system is dominated by the local packing disorder. This length scale, which we observe directly, diverges as $1/Δz$, where $Δz$ is the difference between contact number and its isostatic value, and appears to scale identically to the length scale which had been introduced earlier in the interpretation of the spectrum of vibrational modes. It governs the crossover from isostatic behavior at the small scale to continuum behavior at the large scale; indeed we identify this length scale with the coarse graining length needed to obtain a smooth stress field. We characterize the non-affine displacements of the particles using the \emph{displacement angle distribution}, a local measure for the amount of relative sliding, and analyze the connection between local relative displacements and the elastic moduli.
description: 19 pages, 15 figures, submitted to Phys. Rev. E
ALMA indaga sulla polvere
Creators: Ufficio stampa Inaf
Publisher: name: Media Inaf
Year: 2014

ALMA (Atacama Large Millimeter/submillimeter Array) cattura per la prima volta i resti di una recente supernova ricca di polvere appena formata. Se una quantità sufficiente di questa polvere riesce a completare il rischioso passaggio verso lo spazio interstellare, potrebbe spiegare come molte galassie abbiano acquisito il loro aspetto scuro e "polveroso".
Apparently non-invariant terms of nonlinear sigma models in lattice perturbation theory
Creators: name: Harada, Koji
name: Hattori, Nozomu
name: Kubo, Hirofumi
name: Yamamoto, Yuki
Publisher: name: arXiv
Year: 2009
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: High Energy Physics - Lattice (hep-lat)
subject: FOS: Physical sciences

description: Apparently non-invariant terms (ANTs) which appear in loop diagrams for nonlinear sigma models (NLSs) are revisited in lattice perturbation theory. The calculations have been done mostly with dimensional regularization so far. In order to establish that the existence of ANTs is independent of the regularization scheme, and of the potential ambiguities in the definition of the Jacobian of the change of integration variables from group elements to "pion" fields, we employ lattice regularization, in which everything (including the Jacobian) is well-defined. We show explicitly that lattice perturbation theory produces ANTs in the four-point functions of the "pion" fields at one-loop and the Jacobian does not play an important role in generating ANTs.
description: 17 pages, 5 figures
title: Ð¡Ð¾Ð²ÐµÑÑÐµÐ½ÑÑÐ²Ð¾Ð²Ð°Ð½Ð¸Ðµ ÑÐ¸ÑÑÐµÐ¼Ñ ÑÐ¿ÑÐ°Ð²Ð»ÐµÐ½Ð¸Ñ Ð¿ÐµÑÑÐ¾Ð½Ð°Ð»Ð¾Ð¼ Ð½Ð° Ð¿ÑÐµÐ´Ð¿ÑÐ¸ÑÑÐ¸Ð¸
title: Ð±Ð°ÐºÐ°Ð»Ð°Ð²ÑÑÐºÐ°Ñ ÑÐ°Ð±Ð¾ÑÐ°
titleType: Subtitle
Creators: name: ÐÐ»Ð°ÑÐ¾Ð², ÐÐ½ÑÐ¾Ð½
Publisher: name: Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¸Ð¹ Ð¿Ð¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹ ÑÐ½Ð¸Ð²ÐµÑÑÐ¸ÑÐµÑ ÐÐµÑÑÐ° ÐÐµÐ»Ð¸ÐºÐ¾Ð³Ð¾
Year: 2017
Subjects: ÑÐ¸ÑÑÐµÐ¼Ð° ÑÐ¿ÑÐ°Ð²Ð»ÐµÐ½Ð¸Ñ
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Ð¿ÑÐ¾Ð¸Ð·Ð²Ð¾Ð´Ð¸ÑÐµÐ»ÑÐ½Ð¾ÑÑÑ ÑÑÑÐ´Ð°

description: ÐÐ±ÑÐµÐºÑÐ¾Ð¼ Ð¸ÑÑÐ»ÐµÐ´Ð¾Ð²Ð°Ð½Ð¸Ñ Ð² Ð´Ð°Ð½Ð½Ð¾Ð¹ ÑÐ°Ð±Ð¾ÑÐµ ÑÐ²Ð»ÑÐµÑÑÑ Ð¾Ð±ÑÐµÑÑÐ²Ð¾ Ñ Ð¾Ð³ÑÐ°Ð½Ð¸ÑÐµÐ½Ð½Ð¾Ð¹ Ð¾ÑÐ²ÐµÑÑÑÐ²ÐµÐ½Ð½Ð¾ÑÑÑÑ Â«ÐÑÑÑÐ°Ð½Ð³Â». Ð¦ÐµÐ»ÑÑ Ð²ÑÐ¿ÑÑÐºÐ½Ð¾Ð¹ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð¾Ð¹ ÑÐ°Ð±Ð¾ÑÑ ÑÐ²Ð»ÑÐµÑÑÑ ÑÐ»ÑÑÑÐµÐ½Ð¸Ðµ ÑÐ¸ÑÑÐµÐ¼Ñ ÑÐ¿ÑÐ°Ð²Ð»ÐµÐ½Ð¸Ñ Ð¿ÐµÑÑÐ¾Ð½Ð°Ð»Ð¾Ð¼ Ð½Ð° Ð¿ÑÐµÐ´Ð¿ÑÐ¸ÑÑÐ¸Ð¸. ÐÐ° Ð¾ÑÐ½Ð¾Ð²Ðµ Ð°Ð½Ð°Ð»Ð¸Ð·Ð° ÑÑÑÐµÑÑÐ²ÑÑÑÐµÐ¹ ÑÐ¸ÑÑÐµÐ¼Ñ ÑÐ¿ÑÐ°Ð²Ð»ÐµÐ½Ð¸Ñ Ð¿ÐµÑÑÐ¾Ð½Ð°Ð»Ð¾Ð¼ ÐºÐ¾Ð¼Ð¿Ð°Ð½Ð¸Ð¸ Â«ÐÑÑÑÐ°Ð½Ð³Â» Ð²ÑÑÐ²Ð»ÐµÐ½Ñ Ð¿ÑÐ¾Ð±Ð»ÐµÐ¼Ñ Ð² ÑÐ¸ÑÑÐµÐ¼Ðµ ÑÐ¿ÑÐ°Ð²Ð»ÐµÐ½Ð¸Ñ Ð¿ÐµÑÑÐ¾Ð½Ð°Ð»Ð¾Ð¼, Ð² Ð¾ÑÐ¾ÑÐ¼Ð»ÐµÐ½Ð¸Ð¸ Ð´Ð¾Ð»Ð¶Ð½Ð¾ÑÑÐ½ÑÑ Ð¸Ð½ÑÑÑÑÐºÑÐ¸Ð¹, Ð° ÑÐ°Ðº Ð¶Ðµ Ð¿ÑÐ¾Ð±Ð»ÐµÐ¼Ñ Ð² ÑÐ¾ÑÐ¸Ð°Ð»ÑÐ½Ð¾-Ð¿ÑÐ¸ÑÐ¾Ð»Ð¾Ð³Ð¸ÑÐµÑÐºÐ¾Ð¼ ÐºÐ»Ð¸Ð¼Ð°ÑÐµ ÐºÐ¾Ð»Ð»ÐµÐºÑÐ¸Ð²Ð°. Ð Ð°Ð·ÑÐ°Ð±Ð¾ÑÐ°Ð½Ñ Ð¼ÐµÑÐ¾Ð¿ÑÐ¸ÑÑÐ¸Ñ Ð¿Ð¾ ÑÐ»ÑÑÑÐµÐ½Ð¸Ñ ÑÐ¸ÑÑÐµÐ¼Ñ ÑÐ¿ÑÐ°Ð²Ð»ÐµÐ½Ð¸Ñ Ð¿ÐµÑÑÐ¾Ð½Ð°Ð»Ð¾Ð¼, Ð²Ð²ÐµÐ´ÐµÐ½Ð¸Ñ Ð½Ð¾Ð²ÑÑ Ð´Ð¾Ð»Ð¶Ð½Ð¾ÑÑÐ½ÑÑ Ð¸Ð½ÑÑÑÑÐºÑÐ¸Ð¹, Ð¿ÐµÑÐµÑÐ¼Ð¾ÑÑÑ ÑÐ¸ÑÑÐµÐ¼Ñ Ð¿ÑÐµÐ¼Ð¸ÑÐ¾Ð²Ð°Ð½Ð¸Ñ, Ð° ÑÐ°Ðº Ð¶Ðµ Ð²Ð²ÐµÐ´ÐµÐ½Ð¸Ñ ÑÐ¸ÑÑÐµÐ¼Ñ Ð°Ð½ÐºÐµÑÐ¸ÑÐ¾Ð²Ð°Ð½Ð¸Ñ ÑÑÐµÐ´Ð¸ Ð¿ÐµÑÑÐ¾Ð½Ð°Ð»Ð°. Ð¡Ð´ÐµÐ»Ð°Ð½ Ð¿ÑÐ¾Ð³Ð½Ð¾Ð· Ð¾Ð¶Ð¸Ð´Ð°ÐµÐ¼ÑÑ ÑÐºÐ¾Ð½Ð¾Ð¼Ð¸ÑÐµÑÐºÐ¸Ñ Ð¿Ð¾ÐºÐ°Ð·Ð°ÑÐµÐ»ÐµÐ¹ Ð´ÐµÑÑÐµÐ»ÑÐ½Ð¾ÑÑÐ¸ ÐÐÐ Â«ÐÑÑÑÐ°Ð½Ð³Â» Ð¿Ð¾ÑÐ»Ðµ Ð²Ð½ÐµÐ´ÑÐµÐ½Ð¸Ñ Ð¿ÑÐµÐ´Ð»Ð¾Ð¶ÐµÐ½Ð½ÑÑ Ð¼ÐµÑÐ¾Ð¿ÑÐ¸ÑÑÐ¸Ð¹. Ð ÐµÐ°Ð»Ð¸Ð·Ð°ÑÐ¸Ñ Ð¿ÑÐµÐ´Ð»Ð¾Ð¶ÐµÐ½Ð½ÑÑ Ð¼ÐµÑÐ¾Ð¿ÑÐ¸ÑÑÐ¸Ð¹ ÑÐ¿Ð¾ÑÐ¾Ð±Ð½Ð° Ð²Ð½ÐµÑÑÐ¸ Ð±Ð¾Ð»ÑÑÐ¾Ð¹ Ð²ÐºÐ»Ð°Ð´ Ð² Ð¿Ð¾Ð²ÑÑÐµÐ½Ð¸Ðµ ÑÑÑÐµÐºÑÐ¸Ð²Ð½Ð¾ÑÑÐ¸ Ð¸ÑÐ¿Ð¾Ð»ÑÐ·Ð¾Ð²Ð°Ð½Ð¸Ñ ÑÐ¸ÑÑÐµÐ¼Ñ ÑÐ¿ÑÐ°Ð²Ð»ÐµÐ½Ð¸Ñ Ð¿ÐµÑÑÐ¾Ð½Ð°Ð»Ð¾Ð¼ Ð¾ÑÐ³Ð°Ð½Ð¸Ð·Ð°ÑÐ¸Ð¸ Ð¸ ÑÐ²ÐµÐ»Ð¸ÑÐµÐ½Ð¸Ðµ ÑÐ¸Ð½Ð°Ð½ÑÐ¾Ð²ÑÑ ÑÐµÐ·ÑÐ»ÑÑÐ°ÑÐ¾Ð² ÑÐºÐ¾Ð½Ð¾Ð¼Ð¸ÑÐµÑÐºÐ¾Ð¹ Ð´ÐµÑÑÐµÐ»ÑÐ½Ð¾ÑÑÐ¸ Ð¿ÑÐµÐ´Ð¿ÑÐ¸ÑÑÐ¸Ñ.
Electrical and thermal transport properties of kagome metals $A$Ti$_3$Bi$_5$ ($A$ = Rb, Cs)
Creators: name: Chen, Xintong
name: Liu, Xiangqi
name: Xia, Wei
name: Mi, Xinrun
name: Zhong, Luyao
name: Yang, Kunya
name: Zhang, Long
name: Gan, Yuhan
name: Liu, Yan
name: Wang, Guiwen
name: Wang, Aifeng
name: Chai, Yisheng
name: Shen, Junying
name: Yang, Xiaolong
name: Guo, Yanfeng
name: He, Mingquan
Publisher: name: arXiv
Year: 2023
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We report electrical and thermal transport properties of single crystalline kagome metals $A$Ti$_3$Bi$_5$ ($A$ = Rb, Cs). Different from the structural similar kagome superconductors $A$V$_3$Sb$_5$, no charge density wave instabilities are found in $A$Ti$_3$Bi$_5$. At low temperatures below 5 K, signatures of superconductivity appear in $A$Ti$_3$Bi$_5$ as seen in magnetization measurements. However, bulk superconductivity is not evidenced by specific heat results. Similar to $A$V$_3$Sb$_5$, $A$Ti$_3$Bi$_5$ show nonlinear magnetic field dependence of the Hall effect below about 70 K, pointing to a multiband nature. Unlike $A$V$_3$Sb$_5$ in which phonons and electron-phonon coupling play important roles in thermal transport, the thermal conductivity in $A$Ti$_3$Bi$_5$ is dominated by electronic contributions. Moreover, our calculated electronic structure suggests that van Hove singularities are sitting well above the Fermi energy. Compared with $A$V$_3$Sb$_5$, the absence of charge orders in $A$Ti$_3$Bi$_5$ is closely associated with minor contributions from electron-phonon coupling and/or van Hove singularities.
description: 8 pages, 5 figures,accepted for publication in Phys. Rev. B
Revisiting the Impact of Dependency Network Metrics on Software Defect Prediction
Creators: name: Gong, Lina
name: Rajbahadur, Gopi Krishnan
name: Hassan, Ahmed E.
name: Jiang, Shujuan
Publisher: name: arXiv
Year: 2022
Subjects: subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences

description: Software dependency network metrics extracted from the dependency graph of the software modules by the application of Social Network Analysis (SNA metrics) have been shown to improve the performance of the Software Defect prediction (SDP) models. However, the relative effectiveness of these SNA metrics over code metrics in improving the performance of the SDP models has been widely debated with no clear consensus. Furthermore, some of the common SDP scenarios like predicting the number of defects in a module (Defect-count) in Cross-version and Cross-project SDP contexts remain unexplored. Such lack of clear directive on the effectiveness of SNA metrics when compared to the widely used code metrics prevents us from potentially building better performing SDP models. Therefore, through a case study of 9 open source software projects across 30 versions, we study the relative effectiveness of SNA metrics when compared to code metrics across 3 commonly used SDP contexts (Within-project, Cross-version and Cross-project) and scenarios (Defect-count, Defect-classification (classifying if a module is defective) and Effort-aware (ranking the defective modules w.r.t to the involved effort)). We find the SNA metrics by themselves or along with code metrics improve the performance of SDP models over just using code metrics on 5 out of the 9 studied SDP scenarios (three SDP scenarios across three SDP contexts). However, we note that in some cases the improvements afforded by considering SNA metrics over or alongside code metrics might only be marginal, whereas in other cases the improvements could be potentially large. Based on these findings we suggest that the future work should: consider SNA metrics alongside code metrics in their SDP models; as well as consider Ego metrics and Global metrics, the two different types of the SNA metrics separately when training SDP models as they behave differently.
Statistics of phase space localization measures and quantum chaos in the kicked top model
Creators: name: Wang, Qian
name: Robnik, Marko
Publisher: name: arXiv
Year: 2023
Subjects: subject: Chaotic Dynamics (nlin.CD)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Quantum chaos plays a significant role in understanding several important questions of recent theoretical and experimental studies. Here, by focusing on the localization properties of eigenstates in phase space (by means of Husimi functions),we explore the characterizations of quantum chaos using the statistics of the localization measures. We consider the paradigmatic kicked top model, which shows a transition to chaos with increasing the kicking strength. We demonstrate that the distributions of the localization measures exhibit a drastic change as the system undergoes the crossover from integrability to chaos. We also show how to identify the signatures of quantum chaos from the central moments of the distributions of localization measures. Moreover, we find that the localization measures in the fully chaotic regime apparently exhibit universally the beta distribution, in agreement with previous studies in the billiard systems and the Dicke model. Our results contribute to a further understanding of quantum chaos and shed light on the usefulness of the statistics of phase space localization measures in diagnosing the presence of quantum chaos, as well as the localization properties of eigenstates in quantum chaotic systems.
description: 13 pages, 8 figures
Dynamical stability of infinite homogeneous self-gravitating systems: application of the Nyquist method
Creators: name: Chavanis, Pierre-Henri
Publisher: name: arXiv
Year: 2010
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We complete classical investigations concerning the dynamical stability of an infinite homogeneous gaseous medium described by the Euler-Poisson system or an infinite homogeneous stellar system described by the Vlasov-Poisson system (Jeans problem). To determine the stability of an infinite homogeneous stellar system with respect to a perturbation of wavenumber k, we apply the Nyquist method. We first consider the case of single-humped distributions and show that, for infinite homogeneous systems, the onset of instability is the same in a stellar system and in the corresponding barotropic gas, contrary to the case of inhomogeneous systems. We show that this result is true for any symmetric single-humped velocity distribution, not only for the Maxwellian. If we specialize on isothermal and polytropic distributions, analytical expressions for the growth rate, damping rate and pulsation period of the perturbation can be given. Then, we consider the Vlasov stability of symmetric and asymmetric double-humped distributions (two-stream stellar systems) and determine the stability diagrams depending on the degree of asymmetry. We compare these results with the Euler stability of two self-gravitating gaseous streams. Finally, we determine the corresponding stability diagrams in the case of plasmas and compare the results with self-gravitating systems.
title: Ð­ÐºÐ¾Ð½Ð¾Ð¼Ð¸ÐºÐ¾-Ð¾ÑÐ³Ð°Ð½Ð¸Ð·Ð°ÑÐ¸Ð¾Ð½Ð½ÑÐµ Ð¿ÑÐ¾Ð±Ð»ÐµÐ¼Ñ Ð´ÐµÑÑÐµÐ»ÑÐ½Ð¾ÑÑÐ¸ Ð¼Ð°Ð»ÑÑ Ð¿ÑÐµÐ´Ð¿ÑÐ¸ÑÑÐ¸Ð¹ Ð² ÑÐ¾ÑÐ³Ð¾Ð²Ð»Ðµ
title: Ð²ÑÐ¿ÑÑÐºÐ½Ð°Ñ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð°Ñ ÑÐ°Ð±Ð¾ÑÐ° Ð±Ð°ÐºÐ°Ð»Ð°Ð²ÑÐ°
titleType: Subtitle
Creators: name: ÐÐ¸ÐºÑÐ¾ÑÐ¾Ð²Ð°, ÐÐ½Ð½Ð°
Publisher: name: Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¸Ð¹ Ð¿Ð¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹ ÑÐ½Ð¸Ð²ÐµÑÑÐ¸ÑÐµÑ ÐÐµÑÑÐ° ÐÐµÐ»Ð¸ÐºÐ¾Ð³Ð¾
Year: 2018
Subjects: Ð¼Ð°Ð»ÑÐ¹ Ð±Ð¸Ð·Ð½ÐµÑ
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description: Ð ÑÐ°Ð±Ð¾ÑÐµ Ð¿ÑÐ¾Ð°Ð½Ð°Ð»Ð¸Ð·Ð¸ÑÐ¾Ð²Ð°Ð½Ð¾ ÑÐµÐºÑÑÐµÐµ ÑÐ¾ÑÑÐ¾ÑÐ½Ð¸Ðµ Ð¸ Ð¿ÐµÑÑÐ¿ÐµÐºÑÐ¸Ð²Ñ ÑÐ°Ð·Ð²Ð¸ÑÐ¸Ñ Ð¼Ð°Ð»Ð¾Ð³Ð¾ Ð¿ÑÐµÐ´Ð¿ÑÐ¸Ð½Ð¸Ð¼Ð°ÑÐµÐ»ÑÑÑÐ²Ð° Ð² ÑÐ¾ÑÐ³Ð¾Ð²Ð»Ðµ Ð² Ð Ð¾ÑÑÐ¸Ð¹ÑÐºÐ¾Ð¹ Ð¤ÐµÐ´ÐµÑÐ°ÑÐ¸Ð¸. ÐÐ°Ð½Ð° ÑÐºÐ¾Ð½Ð¾Ð¼Ð¸ÐºÐ¾-Ð¾ÑÐ³Ð°Ð½Ð¸Ð·Ð°ÑÐ¸Ð¾Ð½Ð½Ð°Ñ ÑÐ°ÑÐ°ÐºÑÐµÑÐ¸ÑÑÐ¸ÐºÐ° Ð¼Ð°Ð»Ð¾Ð³Ð¾ Ð¿ÑÐµÐ´Ð¿ÑÐ¸ÑÑÐ¸Ñ ÐÐÐ Â«ÐÐµÐ»ÐµÐ½Ð°Â», Ð·Ð°Ð½Ð¸Ð¼Ð°ÑÑÐµÐ³Ð¾ÑÑ Ð¾Ð¿ÑÐ¾Ð²Ð¾Ð¹ ÑÐ¾ÑÐ³Ð¾Ð²Ð»Ðµ Ð¿ÑÐ¾Ð´ÑÐºÑÐ°Ð¼Ð¸ Ð¿Ð¸ÑÐ°Ð½Ð¸Ñ. ÐÑÑÐ²Ð»ÐµÐ½Ñ Ð¾ÑÐ½Ð¾Ð²Ð½ÑÐµ Ð¿ÑÐ¾Ð±Ð»ÐµÐ¼Ñ Ð¸ÑÑÐ»ÐµÐ´ÑÐµÐ¼Ð¾Ð³Ð¾ Ð¿ÑÐµÐ´Ð¿ÑÐ¸ÑÑÐ¸Ñ, Ð¾Ð¿ÑÐµÐ´ÐµÐ»ÐµÐ½Ñ Ð¾ÑÐ½Ð¾Ð²Ð½ÑÐµ Ð¿ÐµÑÑÐ¿ÐµÐºÑÐ¸Ð²Ñ ÐµÐ³Ð¾ ÑÐ°Ð·Ð²Ð¸ÑÐ¸Ñ. ÐÑÐµÐ´Ð»Ð¾Ð¶ÐµÐ½Ñ Ð¼ÐµÑÐ¾Ð¿ÑÐ¸ÑÑÐ¸Ñ Ð¿Ð¾ Ð¿Ð¾Ð²ÑÑÐµÐ½Ð¸Ñ ÑÑÑÐµÐºÑÐ¸Ð²Ð½Ð¾ÑÑÐ¸ ÑÐ¾Ð·ÑÐ¹ÑÑÐ²ÐµÐ½Ð½Ð¾Ð¹ Ð´ÐµÑÑÐµÐ»ÑÐ½Ð¾ÑÑÐ¸ ÐÐÐ Â«ÐÐµÐ»ÐµÐ½Ð°Â», ÑÐ°ÑÑÑÐ¸ÑÐ°Ð½Ð° ÑÐºÐ¾Ð½Ð¾Ð¼Ð¸ÑÐµÑÐºÐ°Ñ ÑÑÑÐµÐºÑÐ¸Ð²Ð½Ð¾ÑÑÑ Ð¿ÑÐµÐ´Ð»Ð¾Ð¶ÐµÐ½Ð½ÑÑ Ð¼ÐµÑÐ¾Ð¿ÑÐ¸ÑÑÐ¸Ð¹.
Con la Nasa fra l’Ara Pacis e Montecitorio
Creators: Marco Malaspina
Publisher: name: Media Inaf
Year: 2014

Per fare luce sulla relazione fra l’antico obelisco di Campo Marzio e l’altare della pace augustea, un archeo-informatico dell'Indiana University, grazie a un software di ricostruzione della volta celeste, ha riportato le lancette del tempo indietro di migliaia di anni.
Magnetic Structure of Umbral Dots Observed with Hinode Solar Optical Telescope
Creators: name: Watanabe, Hiroko
name: Kitai, Reizaburo
name: Ichimoto, Kiyoshi
name: Katsukawa, Yukio
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: High resolution and seeing-free spectroscopic observation of a decaying sunspot was done with the Solar Optical Telescope aboard Hinode satellite. The target was NOAA 10944 located in the west side of the solar surface from March 2 to March 4, 2007. The umbra included many umbral dots (UDs) with size of ~300 km in continuum light. We report the magnetic structures and Doppler velocity fields around UDs, based on the Milne-Eddington inversion of the two iron absorption lines at 6302 angstrom. The histograms of magnetic field strength(B), inclination angle(i), and Doppler velocity(v) of UDs showed a center-to-limb variation. Observed at disk center, UDs had (1)slightly smaller field strength (Delta B=-17 Gauss) and (2)relative blue shifts (Delta v=28 m s-1) compared to their surroundings. When the sunspot got close to the limb, UDs and their surroundings showed almost no difference in the magnetic and Doppler values. This center-to-limb variation can be understood by the formation height difference in a cusp-shaped magnetized atmosphere around UDs, due to the weakly magnetized hot gas intrusion. In addition, some UDs showed oscillatory light curves with multiple peaks around 10 min, which may indicate the presence of the oscillatory convection. We discuss our results in the frameworks of two theoretical models, the monolithic model (Schussler & Vogler 2006) and the field-free intrusion model (Spruit & Scharmer 2006).
description: 8 pages, 8 figures, accepted for publication in PASJ
Impact of Discretization Noise of the Dependent variable on Machine Learning Classifiers in Software Engineering
Creators: name: Rajbahadur, Gopi Krishnan
name: Wang, Shaowei
name: Kamei, Yasutaka
name: Hassan, Ahmed E.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Software Engineering (cs.SE)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Researchers usually discretize a continuous dependent variable into two target classes by introducing an artificial discretization threshold (e.g., median). However, such discretization may introduce noise (i.e., discretization noise) due to ambiguous class loyalty of data points that are close to the artificial threshold. Previous studies do not provide a clear directive on the impact of discretization noise on the classifiers and how to handle such noise. In this paper, we propose a framework to help researchers and practitioners systematically estimate the impact of discretization noise on classifiers in terms of its impact on various performance measures and the interpretation of classifiers. Through a case study of 7 software engineering datasets, we find that: 1) discretization noise affects the different performance measures of a classifier differently for different datasets; 2) Though the interpretation of the classifiers are impacted by the discretization noise on the whole, the top 3 most important features are not affected by the discretization noise. Therefore, we suggest that practitioners and researchers use our framework to understand the impact of discretization noise on the performance of their built classifiers and estimate the exact amount of discretization noise to be discarded from the dataset to avoid the negative impact of such noise.
Metti un superfluido nel ripieno
Creators: Stefano Parisini
Publisher: name: Media Inaf
Year: 2014

Recenti simulazioni numeriche suggeriscono che l’interno liquido delle stelle di neutroni si trovi in uno stato superfluido. Introducendo la superfluidità nei modelli vengono infatti meglio spiegate le osservazioni di emissioni in raggi x e gamma conseguenti a veri e propri terremoti stellari.
title: ÐÐµÐ¹ÑÐ¾Ð¸Ð½ÑÐ¾ÑÐ¼Ð°ÑÐ¸ÐºÐ° Ð¸ Ð½ÐµÐ¹ÑÐ¾ÑÐµÑ Ð½Ð¾Ð»Ð¾Ð³Ð¸Ð¸. Ð§. 1, Ð¡ÐµÑÐ¸ Ð¿ÑÑÐ¼Ð¾Ð³Ð¾ ÑÐ°ÑÐ¿ÑÐ¾ÑÑÑÐ°Ð½ÐµÐ½Ð¸Ñ
title: ÑÑÐµÐ±Ð½Ð¾Ðµ Ð¿Ð¾ÑÐ¾Ð±Ð¸Ðµ
titleType: Subtitle
Creators: name: Ð¨ÐºÐ¾Ð´ÑÑÐµÐ², ÐÑÑÐµÑÐ»Ð°Ð²
Publisher: name: ÐÐ·Ð´-Ð²Ð¾ Ð¡ÐÐ±ÐÐ¢Ð£
Year: 2001
Subjects: ÐÐµÐ¹ÑÐ¾-Ð­ÐÐ

description: ÐÐ¾ÑÐ¾Ð±Ð¸Ðµ ÑÐ¾Ð¾ÑÐ²ÐµÑÑÑÐ²ÑÐµÑ Ð°Ð²ÑÐ¾ÑÑÐºÐ¾Ð¼Ñ ÐºÑÑÑÑ Ð´Ð¸ÑÑÐ¸Ð¿Ð»Ð¸Ð½Ñ Ð¼Ð°Ð³Ð¸ÑÑÐµÑÑÐºÐ¾Ð¹ Ð¿Ð¾Ð´Ð³Ð¾ÑÐ¾Ð²ÐºÐ¸ "ÐÐ½ÑÐ¾ÑÐ¼Ð°ÑÐ¸ÐºÐ°" Ð½Ð°Ð¿ÑÐ°Ð²Ð»ÐµÐ½Ð¸Ñ 552800 "ÐÐ½ÑÐ¾ÑÐ¼Ð°ÑÐ¸ÐºÐ° Ð¸ Ð²ÑÑÐ¸ÑÐ»Ð¸ÑÐµÐ»ÑÐ½Ð°Ñ ÑÐµÑÐ½Ð¸ÐºÐ°". Ð Ð°ÑÑÐ¼Ð¾ÑÑÐµÐ½Ñ Ð¾Ð±ÑÐ¸Ðµ Ð¿Ð¾Ð»Ð¾Ð¶ÐµÐ½Ð¸Ñ ÑÐ¾Ð²ÑÐµÐ¼ÐµÐ½Ð½Ð¾Ð¹ ÑÐµÐ¾ÑÐ¸Ð¸ Ð¸ÑÐºÑÑÑÑÐ²ÐµÐ½Ð½ÑÑ Ð½ÐµÐ¹ÑÐ¾Ð½Ð½ÑÑ ÑÐµÑÐµÐ¹ Ð¸ Ð¸Ñ Ð¿ÑÐ¸Ð¼ÐµÐ½ÐµÐ½Ð¸Ñ Ð¿ÑÐ¸ ÑÐµÑÐµÐ½Ð¸Ð¸ Ð¿ÑÐ¸ÐºÐ»Ð°Ð´Ð½ÑÑ Ð·Ð°Ð´Ð°Ñ. ÐÑÐ½Ð¾Ð²Ð½Ð¾Ðµ Ð²Ð½Ð¸Ð¼Ð°Ð½Ð¸Ðµ ÑÐ´ÐµÐ»ÐµÐ½Ð¾ Ð½Ð°Ð¸Ð±Ð¾Ð»ÐµÐµ ÑÐ°ÑÐ¿ÑÐ¾ÑÑÑÐ°Ð½ÐµÐ½Ð½Ð¾Ð¼Ñ ÐºÐ»Ð°ÑÑÑ Ð¼Ð¾Ð´ÐµÐ»ÐµÐ¹ â ÑÐµÑÑÐ¼ Ð¿ÑÑÐ¼Ð¾Ð³Ð¾ ÑÐ°ÑÐ¿ÑÐ¾ÑÑÑÐ°Ð½ÐµÐ½Ð¸Ñ. ÐÐ¿Ð¸ÑÑÐ²Ð°ÐµÑÑÑ ÑÑÑÑÐºÑÑÑÐ° Ð¸ Ð°Ð»Ð³Ð¾ÑÐ¸ÑÐ¼Ñ ÑÑÐ½ÐºÑÐ¸Ð¾Ð½Ð¸ÑÐ¾Ð²Ð°Ð½Ð¸Ñ ÑÐµÑÐµÐ¹. ÐÑÐµÐ´Ð½Ð°Ð·Ð½Ð°ÑÐµÐ½Ð¾ Ð´Ð»Ñ ÑÑÑÐ´ÐµÐ½ÑÐ¾Ð² ÑÑÐ°ÑÑÐ¸Ñ ÐºÑÑÑÐ¾Ð² ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ñ ÑÐ¿ÐµÑÐ¸Ð°Ð»ÑÐ½Ð¾ÑÑÐµÐ¹, Ð¸Ð·ÑÑÐ°ÑÑÐ¸Ñ ÑÐ»ÐµÐºÑÐ¸Ð²Ð½ÑÐµ Ð´Ð¸ÑÑÐ¸Ð¿Ð»Ð¸Ð½Ñ Ð¸Ð½ÑÐ¾ÑÐ¼Ð°ÑÐ¸ÐºÐ¸ Ð¸ Ð²ÑÑÐ¸ÑÐ»Ð¸ÑÐµÐ»ÑÐ½Ð¾Ð¹ ÑÐµÑÐ½Ð¸ÐºÐ¸ Ð² ÑÐ°Ð¼ÐºÐ°Ñ Ð¸Ð½Ð¶ÐµÐ½ÐµÑÐ½Ð¾Ð¹ Ð¸ Ð¼Ð°Ð³Ð¸ÑÑÐµÑÑÐºÐ¾Ð¹ Ð¿Ð¾Ð´Ð³Ð¾ÑÐ¾Ð²ÐºÐ¸.
description: ÐÐµÑÐ°ÑÐ°ÐµÑÑÑ Ð¿Ð¾ ÑÐµÑÐµÐ½Ð¸Ñ ÑÐµÐ´Ð°ÐºÑÐ¸Ð¾Ð½Ð½Ð¾-Ð¸Ð·Ð´Ð°ÑÐµÐ»ÑÑÐºÐ¾Ð³Ð¾ ÑÐ¾Ð²ÐµÑÐ° Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¾Ð³Ð¾ Ð³Ð¾ÑÑÐ´Ð°ÑÑÑÐ²ÐµÐ½Ð½Ð¾Ð³Ð¾ ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¾Ð³Ð¾ ÑÐ½Ð¸Ð²ÐµÑÑÐ¸ÑÐµÑÐ°.
Gaia in vista di L2
Creators: Eleonora Ferroni
Publisher: name: Media Inaf
Year: 2014

Fra poco più di tre mesi cominceranno le ricerche vere e proprie. Prima GAIA, il gioiellino dell'ESA, dovrà posizionarsi nel punto Lagrangiano L2, è una regione di equilibrio gravitazionale nel sistema Terra-Sole.
In viaggio fuori dai ghiacci
Creators: Francesco D'Alessio
Publisher: name: Media Inaf
Year: 2014

Gli ultimi aggiornamenti da Francesco D'alessio, ricercatore dell'INAF e uno degli italiani a bordo della rompighiaccio australiana Aurora Australis, coinvolta nelle operazioni di recupero dei passeggeri della nave russa Akademik Shokalskiy intrappolata nei ghiacci dell'Antartide.
NRG calculations of the ground-state energy: application to the correlation effects in the adsorption of magnetic impurities on metal surfaces
Creators: name: Zitko, Rok
Publisher: name: arXiv
Year: 2009
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The ground-state energy of a quantum impurity model can be calculated using the numerical renormalization group with a modified discretization scheme, with sufficient accuracy to reliably extract physical information about the system. The approach is applied to study binding of magnetic adsorbates modeled by the Anderson-Newns model for chemisorption on metal surfaces. The correlation energy is largest in the valence-fluctuation regime; in the strong-coupling (Kondo) regime the Kondo-singlet formation energy is found to be only a minor contribution. As an application of the method to more difficult surface-science problems, we study the binding energy of a magnetic atom adsorbed near a step edge on a surface with a strongly modulated surface-state electron density. The zero-temperature magnetic susceptibility is determined from the field dependence of the binding energy, thereby providing an independent result for the Kondo temperature TK, which agrees very well with the TK extracted from a thermodynamic calculation.
description: 4 pages
Il mistero dei computer quantistici
Creators: Giulia Bonelli
Publisher: name: Media Inaf
Year: 2014

Documenti resi pubblici dalla “talpa” Edward Snowden rivelano l’obiettivo dell’Agenzia per la Sicurezza Nazionale statunitense di costruire un supercomputer in grado di penetrare e decodificare qualunque messaggio cifrato. Lo scetticismo della comunità scientifica.
Betelgeuse, una vera ‘superstar’
Creators: Marco Galliani
Publisher: name: Media Inaf
Year: 2014

Luminosissimo e con il suo caratteristico colore rosso-arancio, l’astro principale della costellazione di Orione è una gigante rossa, molto più massiccia del nostro Sole e soprattutto molto, molto più grande. I consigli per individuarla, insieme alle costellazioni, ai pianeti e ai principali fenomeni celesti di questo primo mese del 2014.
title: Differential topology of the spaces of asymptotically stable vector fields and Lyapunov functions
Creators: name: Kvalheim, Matthew D.
Publisher: name: Maryland Shared Open Access Repository
Year: 2025
Subjects: subject: Mathematics - Geometric Topology
subject: Mathematics - Dynamical Systems
subject: Mathematics - Algebraic Topology
subject: Mathematics - Optimization and Control

description: We study the topology of the space of all smooth asymptotically stable vector fields on $\mathbb{R}^n$, as well as the space of all proper smooth Lyapunov functions for such vector fields. We prove that both spaces are path-connected and simply connected when $n\neq 4,5$ and weakly contractible when $n\leq 3$. Moreover, both spaces have the weak homotopy type of the nonlinear Grassmannian of submanifolds of $\mathbb{R}^n$ diffeomorphic to the $n$-disc. The proofs rely on Lyapunov theory and differential topology, such as the work of Smale and Perelman on the generalized Poincar\'{e} conjecture and results of Smale, Cerf, and Hatcher on the topology of diffeomorphism groups of discs. Applications include a partial answer to a question of Conley, a parametric Hartman-Grobman theorem for nonyperbolic but asymptotically stable equilibria, and a parametric Morse lemma for degenerate minima. We also study the related topics of hyperbolic equilibria, Morse minima, and relative homotopy groups of the space of asymptotically stable vector fields inside the space of those vanishing at a single point.
title: Ð¢ÐµÑ Ð½Ð¾Ð»Ð¾Ð³Ð¸Ñ Depth Sensing Ð¸ ÐµÐµ Ð¿ÑÐ°ÐºÑÐ¸ÑÐµÑÐºÐ¾Ðµ Ð¿ÑÐ¸Ð¼ÐµÐ½ÐµÐ½Ð¸Ðµ
title: Ð²ÑÐ¿ÑÑÐºÐ½Ð°Ñ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð°Ñ ÑÐ°Ð±Ð¾ÑÐ° Ð¼Ð°Ð³Ð¸ÑÑÑÐ°
titleType: Subtitle
Creators: name: ÐÐ¸ÐºÐ¾Ð»Ð°ÐµÐ², ÐÐ³Ð¾ÑÑ
Publisher: name: Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¸Ð¹ Ð¿Ð¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹ ÑÐ½Ð¸Ð²ÐµÑÑÐ¸ÑÐµÑ ÐÐµÑÑÐ° ÐÐµÐ»Ð¸ÐºÐ¾Ð³Ð¾
Year: 2018
Subjects: ÐÐ°ÑÐ¸Ð½Ð½Ð°Ñ Ð³ÑÐ°ÑÐ¸ÐºÐ°
ÐÐ·Ð¾Ð±ÑÐ°Ð¶ÐµÐ½Ð¸Ñ
ÐÑÑÐ¸ÑÐ»Ð¸ÑÐµÐ»ÑÐ½ÑÐµ Ð¼Ð°ÑÐ¸Ð½Ñ ÑÐ»ÐµÐºÑÑÐ¾Ð½Ð½ÑÐµ Ð¿ÐµÑÑÐ¾Ð½Ð°Ð»ÑÐ½ÑÐµ

description: ÐÐ°Ð½Ð½Ð°Ñ ÑÐ°Ð±Ð¾ÑÐ° Ð¿Ð¾ÑÐ²ÑÑÐµÐ½Ð° Ð¸Ð·ÑÑÐµÐ½Ð¸Ñ ÑÐ»ÑÑÐ°Ð¹Ð½Ð¾Ð¹ Ð¿Ð¾Ð³ÑÐµÑÐ½Ð¾ÑÑÐ¸ Ð¸Ð·Ð¼ÐµÑÐµÐ½Ð¸Ñ ÑÐ°ÑÑÑÐ¾ÑÐ½Ð¸Ñ Ñ Ð¿Ð¾Ð¼Ð¾ÑÑÑ ÑÑÐµÑÐµÐ¾Ð·ÑÐµÐ½Ð¸Ñ. Ð ÑÐ°Ð±Ð¾ÑÐµ ÑÐ°ÑÑÐ¼Ð¾ÑÑÐµÐ½Ñ ÑÑÑÐµÑÑÐ²ÑÑÑÐ¸Ðµ Ð² Ð½Ð°ÑÑÐ¾ÑÑÐµÐµ Ð²ÑÐµÐ¼Ñ ÑÐ¸ÑÑÐµÐ¼Ñ Ð¿Ð¾Ð»ÑÑÐµÐ½Ð¸Ñ Ð³Ð»ÑÐ±Ð¸Ð½Ñ Ð¸Ð·Ð¾Ð±ÑÐ°Ð¶ÐµÐ½Ð¸Ñ Ð¸ Ð¿ÑÐ¾ÑÐµÑÑ Ð¿Ð¾Ð»ÑÑÐµÐ½Ð¸Ñ ÑÑÐµÑÐµÐ¾Ð¸Ð·Ð¾Ð±ÑÐ°Ð¶ÐµÐ½Ð¸Ð¹. ÐÑÐ±ÑÐ°Ð½Ð° Ð¸ Ð¿ÑÐ¾ÑÐµÑÑÐ¸ÑÐ¾Ð²Ð°Ð½Ð° ÑÐ¸ÑÑÐµÐ¼Ð° ÑÑÐµÑÐµÐ¾Ð·ÑÐµÐ½Ð¸Ñ. Ð ÐµÐ°Ð»Ð¸Ð·Ð¾Ð²Ð°Ð½ Ð°Ð»Ð³Ð¾ÑÐ¸ÑÐ¼ Ð¸Ð·Ð¼ÐµÑÐµÐ½Ð¸Ñ ÑÐ°ÑÑÑÐ¾ÑÐ½Ð¸Ñ Ð¿Ð¾ Ð¸Ð·Ð¾Ð±ÑÐ°Ð¶ÐµÐ½Ð¸Ñ Ñ ÐºÐ°Ð¼ÐµÑ. ÐÑÐ¾Ð²ÐµÐ´ÐµÐ½ ÑÐºÑÐ¿ÐµÑÐ¸Ð¼ÐµÐ½Ñ Ð¸ Ð²ÑÐ¿Ð¾Ð»Ð½ÐµÐ½Ð° Ð¾Ð±ÑÐ°Ð±Ð¾ÑÐºÐ° Ð¿Ð¾Ð»ÑÑÐµÐ½Ð½ÑÑ Ð´Ð°Ð½Ð½ÑÑ.
NLO QCD corrections to processes with multiple electroweak bosons
Creators: name: Zeppenfeld, Dieter
name: Bozzi, G.
name: Campanario, F.
name: Englert, C.
name: Hankele, V.
name: Platzer, S.
name: Jager, B.
name: Oleari, C.
name: Spannowsky, M.
name: Worek, M.
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The VBFNLO program package is a collection of Monte Carlo programs for the calculation of NLO QCD corrections to vector boson fusion cross sections, double and triple vector boson production, or the production of two electroweak bosons in association with an additional jet. An overview is given of the processes and features implemented in VBFNLO. WWgamma and Wgamma jet production are discussed as examples.
description: 6 pages, 3 figures; talk given at RADCOR 2009 - 9th International Symposium on Radiative Corrections (Applications of Quantum Field Theory to Phenomenology), October 25 - 30 2009, Ascona, Switzerland
Studying the vertical aerosol extinction coefficient by comparing in situ airborne data and elastic backscatter lidar
Creators: name: Rosati, Bernadette
name: Herrmann, Erik
name: Bucci, Silvia
name: Fierli, Federico
name: Cairo, Francesco
name: Gysel, Martin
name: Tillmann, Ralf
name: Größ, Johannes
name: Gobbi, Gian Paolo
name: Di Liberto, Luca
name: Di Donfrancesco, Guido
name: Wiedensohler, Alfred
name: Weingartner, Ernest
name: Virtanen, Annele
name: Mentel, Thomas F.
name: Baltensperger, Urs
Publisher: name: Copernicus
Year: 2016
Subjects: subject: 620 - Ingenieurwissenschaften und Maschinenbau

description: Vertical profiles of aerosol particle optical properties were explored in a case study near the San Pietro Capofiume (SPC) ground station during the PEGASOS Po Valley campaign in the summer of 2012. A Zeppelin NT airship was employed to investigate the effect of the dynamics of the planetary boundary layer at altitudes between ∼  50 and 800 m above ground. Determined properties included the aerosol particle size distribution, the hygroscopic growth factor, the effective index of refraction and the light absorption coefficient. The first three parameters were used to retrieve the light scattering coefficient. Simultaneously, direct measurements of both the scattering and absorption coefficient were carried out at the SPC ground station. Additionally, a single wavelength polarization diversity elastic lidar system provided estimates of aerosol extinction coefficients using the Klett method to accomplish the inversion of the signal, for a vertically resolved comparison between in situ and remote-sensing results. Note, however, that the comparison was for the most part done in the altitude range where the overlap function is incomplete and accordingly uncertainties are larger. First, the airborne results at low altitudes were validated with the ground measurements. Agreement within approximately ±25 and ±20 % was found for the dry scattering and absorption coefficient, respectively. The single scattering albedo, ranged between 0.83 and 0.95, indicating the importance of the absorbing particles in the Po Valley region. A clear layering of the atmosphere was observed during the beginning of the flight (until ∼  10:00 LT – local time) before the mixing layer (ML) was fully developed. Highest extinction coefficients were found at low altitudes, in the new ML, while values in the residual layer, which could be probed at the beginning of the flight at elevated altitudes, were lower. At the end of the flight (after ∼  12:00 LT) the ML was fully developed, resulting in constant extinction coefficients at all altitudes measured on the Zeppelin NT. Lidar estimates captured these dynamic features well and good agreement was found for the extinction coefficients compared to the in situ results, using fixed lidar ratios (LR) between 30 and 70 sr for the altitudes probed with the Zeppelin. These LR are consistent with values for continental aerosol particles that can be expected in this region.
Hydrogenation of western hemlock tannin extracts.
Creators: name: Korach, Paul
Publisher: name: University of British Columbia
Year: 2012

description: Unpurified Western Hemlock bark tannin extracts were hydrogenated in the presence and absence of alkali, using Raney nickel as a catalyst. The effect of time, temperature, alkali concentration and catalyst was studied by determining the total amount of phenolic substances (ether solubles) and the relative amounts of phenols and phenolic acids. High yields of phenolic compounds, based on the tannin content of the extract were obtained using relatively mild degradation conditions and the presence of alkali was not necessary to obtain these high yields. Catechol and protocatechuic acid were identified by paper chromatography but other substances apparently are also present. The reaction is complex in nature and needs further study especially with respect to the identification of other main products. A mechanism is suggested which explains the results obtained under differing conditions.
Reduction dependence of superconductivity in undoped T' cuprates
Creators: name: Matsumoto, Osamu
name: Utsuki, Aya
name: Tsukada, Akio
name: Yamamoto, Hideki
name: Manabe, Takaaki
name: Naito, Michio
Publisher: name: arXiv
Year: 2008
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We have recently achieved superconductivity in undoped T'-RE2CuO4 (RE: Pr, Nd, Sm, Eu, and Gd), using epitaxial thin films by metal organic decomposition. The key recipes to achieve superconductivity are low-PO2 firing and subsequent vacuum reduction to minimize the amount of impurity oxygen atoms, which are very harmful to high-Tc superconductivity. In this article, we report our investigation on the reduction dependence of superconductivity of T'-RE2CuO4. For thin films, the amount of remnant Oap atoms is difficult to evaluate but we propose that one good measure for this may be the c-axis lattice constant, which tells us whether the reduction is insufficient or excessive.
description: 13 pages, 4 figures; International Symposium on Superconductivity 2008
Enhanced beam shifts mediated by Bound States in Continuum
Creators: name: Biswas, Sounak Sinha
name: Remesh, Ghanasyam
name: Achanta, Venu Gopal
name: Banerjee, Ayan
name: Ghosh, Nirmalya
name: Gupta, Subhasish Dutta
Publisher: name: arXiv
Year: 2023
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: The interaction of light beams with resonant structures has led to the development of various optical platforms for sensing, particle manipulation, and strong light-matter interaction. In the current study, we investigate the manifestations of the bound states in continuum (BIC) on the in plane and out of plane shifts (referred to as Goos-Hanchen (GH) and Imbert-Fedorov (IF) shifts, respectively) of a finite beam with specific polarization incident at an arbitrary angle. Based on the angular spectrum decomposition, we develop a generic formalism for understanding the interaction of the finite beam with an arbitrary stratified medium with isotropic and homogeneous components. it is applied to the case of a Gaussian beam with p and circularly polarized light incident on a symmetric structure containing two polar dielectric layers separated by a spacer layer. For p-polarized plane wave incidence one of the coupled Berreman modes of the structure was recently shown to evolve to the bound state with infinite localization and diverging quality factor coexisting with the other mode with large radiation leakage (Remesh et al. Optics Communications, 498:127223, 2021). A small deviation from the ideal BIC resonance still offers resonances with very high quality factors and these are exploited in this study to report giant GH shifts. A notable enhancement in the IF shift for circularly polarized light is also shown. Moreover, the reflected beam is shown to undergo distortion leading to a satellite spot. The origin of such a splitting of the reflected beam is traced to a destructive interference due to the left and right halves of the corresponding spectra.
Multifunctional Charge Transfer Plasmon Sensors
Creators: name: Koya, Alemayehu Nana
name: Li, Wei
Publisher: name: arXiv
Year: 2023
Subjects: subject: Optics (physics.optics)
subject: Applied Physics (physics.app-ph)
subject: FOS: Physical sciences

description: Charge transfer plasmon (CTP) modes arise when metallic nanoparticles are connected by a conductive junction. These ultatunable plasmonic modes can be actively tuned and broadly modulated from visible to IR regimes, implying their potentials for applications in sensing. This review showcases recent developments in theory and applications of charge transfer plasmon resonances (CTPRs) in various configurations of conductively linked plasmonic nanodimers. In particular, we give a due attention to exploiting ultratunable spectral features of charge transfer plasmon resonances for developing multifunctional plasmonic sensors for bulk, surface, gas and molecular sensing applications. We have also briefly discussed that the charge and energy transfer between two plasmonic nanoparticles linked by sub-nanometer length self-assembled monolayers are of interest for single-molecule detection and molecular electronics. In addition to the well-established surface plasmon resonance and localized surface plasmon resonance based sensing schemes, CTPR sensors may open up a new route in efforts to develop multifunctional sensing technologies.
Salta il disco e la coppia si forma
Creators: Stefano Parisini
Publisher: name: Media Inaf
Year: 2014

I sistemi stellari doppi o multipli sono molto comuni ma è ancora in discussione la loro origine. Un nuovo studio su protostelle molto giovani, realizzato anche grazie alle rinnovate capacità del radiotelescopio VLA, indica che le coppie di stelle si formano molto probabilmente dalla frammentazione del disco circumstellare.
HD60532, a planetary system in a 3:1 mean motion resonance
Creators: name: Laskar, J.
name: Correia, A. C. M.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences

description: In a recent paper it was reported a planetary system around the star HD60532, composed by two giant planets in a possible 3:1 mean motion resonance, that should be confirmed within the next decade. Here we show that the analysis of the global dynamics of the system allows to confirm this resonance. The present best fit to data already corresponds to this resonant configuration and the system is stable for at least 5Gry. The 3:1 resonance is so robust that stability is still possible for a wide variety of orbital parameters around the best fit solution and also if the inclination of the system orbital plane with respect to the plane of the sky is as small as 15 deg. Moreover, if the inclination is taken as a free parameter in the adjustment to the observations, we find an inclination ~ 20 deg, which corresponds to M_b =3.1 M_Jup and M_c = 7.4 M_Jup for the planetary companions.
description: 4 Pages, 4 Figures, accepted by A&A
Convergence acceleration and stabilization for dynamical-mean-field-theory calculations
Creators: name: Zitko, Rok
Publisher: name: arXiv
Year: 2009
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: The convergence to the self-consistency in the dynamical-mean-field-theory (DMFT) calculations for models of correlated electron systems can be significantly accelerated by using an appropriate mixing of hybridization functions which are used as the input to the impurity solver. It is shown that the techniques and the past experience with the mixing of input charge densities in the density-functional-theory (DFT) calculations are also effective in DMFT. As an example, the increase of the computational requirements near the Mott metal-insulator transition in the Hubbard model due to critical slowing down can be strongly reduced by using the modified Broyden's method to numerically solve the non-linear self-consistency equation. Speed-up factors as high as 3 were observed in practical calculations even for this relatively well behaved problem. Furthermore, the convergence can be achieved in difficult cases where simple linear mixing is either not effective or even leads to divergence. Unstable and metastable solutions can also be obtained. We also determine the linear response of the system with respect to the variations of the hybridization function, which is related to the propagation of the information between the different energy scales during the iteration.
description: 9 pages, 8 figures