cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Curiosi “Cosi” nel cuore della Via Lattea
Creators: Gloria Nobile
Publisher: name: Media Inaf
Year: 2021

È un ritorno alle origini l’ultima piccola missione selezionata dalla Nasa, in particolare a quella delle stelle e degli elementi chimici della nostra galassia. Il telescopio spaziale per raggi gamma Compton Spectrometer and Imager (Cosi) seguirà le “tracce gamma” della Via Lattea per delinearne l’evoluzione, tra esplosioni di stelle massicce e particelle di antimateria
Accrescimento a singhiozzo su una nana bianca
Creators: Maura Sandri
Publisher: name: Media Inaf
Year: 2021

Uno studio pubblicato su Nature Astronomy dimostra che i processi di accrescimento sulle nane bianche in sistemi binari stretti interagenti sono molto simili a quelli osservati nelle binarie con stelle di neutroni con deboli campi magnetici. In particolare, presenta l’accrescimento on-off di Tw Pic, a 1400 anni luce dalla Terra. Allo studio hanno partecipato anche due astrofisici dell’Inaf, Domitilla De Martino e Alessandro Papitto
Expo Dubai: l’Inaf presenta l’Osservatorio Cta
Creators: Ufficio stampa Inaf
Publisher: name: Media Inaf
Year: 2021

Venerdì 22 ottobre l’Osservatorio Cta e l’Inaf ospiteranno l’evento “Cta Observatory: Connecting Minds Worldwide to Unravel the Mysteries of the Extreme Universe” presso il Padiglione Italia dell’Expo 2020 Dubai. Ctao sarà il primo osservatorio di raggi gamma a terra e il più grande e sensibile strumento al mondo per la rilevazione di raggi gamma
Evolution of fragmented states
Creators: name: Paraoanu, G. S.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We consider the problem of evolution of the many-body state of a weakly interacting system of bosons in an initially fragmented (Fock) state. We show that the state at any time can be expressed as a continuous superposition of an infinite number of Gross-Pitaevskii states.
description: 4 pages
A converse to the Grace--Walsh--Szegő theorem
Creators: name: Brändén, Petter
name: Wagner, David G.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Complex Variables (math.CV)
subject: Group Theory (math.GR)
subject: FOS: Mathematics
subject: 32A07; 32A60, 20B10, 20B20

description: We prove that the symmetrizer of a permutation group preserves stability of a polynomial if and only if the group is orbit homogeneous. A consequence is that the hypothesis of permutation invariance in the Grace-Walsh-Szegő Coincidence Theorem cannot be relaxed. In the process we obtain a new characterization of the \emph{Grace-like polynomials} introduced by D. Ruelle, and prove that the class of such polynomials can be endowed with a natural multiplication.
description: 7 pages
Quasi della stessa stoffa di cui son fatte le stelle
Creators: Giuseppe Fiasconaro
Publisher: name: Media Inaf
Year: 2021

Sebbene all’origine vi sia la stessa materia che costituiva le nubi molecolari da cui si sono formati, la chimica delle stelle e dei pianeti che gli orbitano attorno non è esattamente la stessa. È la conclusione di uno studio, pubblicato su Science, che ha analizzato l’abbondanza di molecole ferrose in un campione di esopianeti rocciosi e nelle rispettive stelle ospiti
Generalised land-use mapping from LANDSAT imagery
Creators: name: Wong, Patrick H.T.
Publisher: name: University of British Columbia
Year: 2010

description: Generalised small-scale land-use maps are a useful tool in regional planning. However, their compilation by conventional methods is too time consuming to permit their widespread employment. Remote sensing technology, such as LANDSAT imagery, suggests an alternative method by which compilation and updating can be more conveniently done. The objective of this study is to investigate the advantages and limitations of compiling such maps from LANDSAT images. The study adopted the well used "training set - test set" approach in remote sensing experiments. An imaged area was used as the "training site". It was ground checked to obtain a working knowledge of LANDSAT image signatures. Using this information, signatures of a similiar region recorded in the same image (the test site) were interpreted and field-verified. The interpretation was guided by a dichotomous interpretation key developed for this study instead of the customary machine data processing. The verified manuscript became the basis of a land-use map. Generalisation as a cartographic principle and as a graphic technique were applied to define the scope of the study and to achieve the desired effect for the final map. It was concluded that LANDSAT images can be used to compile generalised small-scale land-use maps. Further refinement in the technique and more experience in this alternative approach were deemed necessary.
Identity Test of Single NV$^-$ Centers in Diamond at Hz-Precision Level
Creators: name: Xie, Tianyu
name: Zhao, Zhiyuan
name: Guo, Maosen
name: Wang, Mengqi
name: Shi, Fazhan
name: Du, Jiangfeng
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Atomic-like defects in solids are not considered to be identical owing to the imperfections of host lattice. Here, we found that even under ambient conditions, negatively charged nitrogen-vacancy (NV$^-$) centers in diamond could still manifest identical at Hz-precision level, corresponding to a 10$^{-7}$-level relative precision, while the lattice strain can destroy the identity by tens of Hz. All parameters involved in the NV$^-$-$^{14}$N Hamiltonian are determined by formulating six nuclear frequencies at 10-mHz-level precision and measuring them at Hz-level precision. The most precisely measured parameter, the $^{14}$N quadrupole coupling $P$, is given by -4945754.9(8) Hz, whose precision is improved by nearly four orders of magnitude compared with previous measurements. We offer an approach for performing precision measurements in solids and deepening our understandings of NV centers as well as other solid-state defects. Besides, these high-precision results imply a potential application of a robust and integrated atomic-like clock based on ensemble NV centers.
description: 18 pages, 7 figures, 4 tables
$f(T)$ Cosmology with Nonzero Curvature
Creators: name: Paliathanasis, Andronikos
Publisher: name: arXiv
Year: 2021
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We investigate exact and analytic solutions in $f\left( T\right) $ gravity within the context of a Friedmann--Lema\^ıtre--Robertson--Walker background space with nonzero spatial curvature. For the power law theory $f\left( T\right) =T^{n}$ we find that the field equations admit an exact solution with a linear scalar factor for negative and positive spatial curvature. That Milne-like solution is asymptotic behaviour for the scale factor near the initial singularity for the model $f\left( T\right) =T+f_{0}T^{n}-2Λ$. The analytic solution for that specific theory is presented in terms of Painlevé Series for $n>1$. Moreover, from the\ value of the resonances of the Painlevé Series we conclude that the Milne-like solution is always unstable while for large values of the indepedent parameter, the field equations provide an expanding universe with a de Sitter expansion of a positive cosmological constant. Finally, the presence of the cosmological term $Λ$ in the studied $f\left( T\right) $ model plays no role in the general behavior of the cosmological solution and the universe immerge in a de Sitter expansion either when the cosmological constant term $Λ$ in the $f\left( T\right) $ model vanishes.
description: 13 pages, no figures, reference list updated
Thomas Hobbes and his mechanistic physiology : factors in the reception of the mechanical philosophy in seventeenth century England
Creators: name: Spohn, William Frederick
Publisher: name: University of British Columbia
Year: 2010

description: Thomas Hobbes is the generally acknowledged pre-eminent English political philosopher in the seventeenth century, and the political areas of his work have been much studied. His contribution in the field of physiology has remained largely unappreciated, and in fact has been deemed to be largely negative by those scholars who have examined it. By examining Hobbes' physiological theory and comparing it to that of other contemporary physiological scientists, this study reaches the conclusion that Hobbes was working very much as a part of the developing mechanical physiological tradition. Furthermore, the basis for making a case for a positive constructive role for Hobbes in the encouragement and dissemination of mechanical physiology in England is formulated. The reasons why such a positive role is not at first apparent are found to include the theological objections to any materialistic doctrine and Hobbes' reputation as an atheist entailed by his philosophy. The climate of scientific and clerical opinion surrounding Hobbes' ideas is also examined. The seemingly paradoxical situation in which Hobbes could make a significant contribution to English science and yet gain no overt recognition for that contribution is discussed.
title: A Sinfonia da Gnose: Uma Auto-Definição da Tradição Ismaelita Ginān
Creators: name: Virani, Shafique Nizarali
Publisher: name: Revista Lusófona de Ciência das Religiões
Year: 2019
Subjects: Ismaili
Ginan

description: The gināns are a corpus of South Asian Ismaili religious literature. Their subject matter ranges widely, and includes such topics as divine love, cosmology, meditation, ritual practice, eschatology and ethical behaviour. The word “ginān” is ultimately derived from the Sanskrit root jñāna and is etymologically related to the Greek word γνῶσις or gnôsis, which has derivatives in many languages. Several scholars have noted the dual significance of the term ginān among the Ismailis as referring both to their sacred literature as well as to gnosis. This comprehensive study explores the purport and use of the word “ginān” in the ginān tradition itself. As most gināns are recited in particular melodies, this study of the ginān tradition is inspired by the organization of the traditional symphony. An extended composition in Western classical music, a symphony is often divided into four movements. Similarly, this study of the “Symphony of Gnosis” is composed of four sections, each exploring different aspects of how the ginān tradition defines itself Keywords: Ismaili, Ginan, Sufism, Bhakti, South Asia, Imam, Shia, Gujarati, Sindhi, poetry
description: Revista Lusófona de Ciência das Religiões, v. 21 n. 1 (2018): Revista Lusófona de Ciência das Religiões
title: Front Matter, Table of Contents, Preface, Conference Organization
Creators: name: Niedermeier, Rolf
name: Vallée, Brigitte
Publisher: name: Schloss Dagstuhl – Leibniz-Zentrum für Informatik
Year: 2018
Subjects: subject: Front Matter
subject: Table of Contents
subject: Preface
subject: Conference Organization

description: Front Matter, Table of Contents, Preface, Conference Organization
description: LIPIcs, Vol. 96, 35th Symposium on Theoretical Aspects of Computer Science (STACS 2018), pages 0:i-0:xvi
L’archetype du voyage dans l’oeuvre de Georges Bugnet
Creators: name: Vallée, Claire Annette
Publisher: name: University of British Columbia
Year: 2010

description: A study of Georges Bugnet's work reveals that in each of his novels there is an example of at least one voyage. Leading critics suggest that the voyage must not be read solely as a physical journey, but rather, they maintain that the horizontal journey is symbolic of a vertical journey towards the "centre" of our being. The introduction outlines the possibility of using this type of interpretation in the study of Georges Bugnet's novels. We suggest that his vision of the world is implicit in his literary production. The following three chapters apply a psychocritical approach to four novels. The conclusion propounds that Georges Bugnet's noble vision, shaped by nature in Canada, is the underlying thread that runs through his work. We believe, as does Bugnet, that the only "real adventure" is the discovery, of one's self. Having achieved this, each individual understands that the principle which governs life is love and he therefore manifests it in the "gift" of himself to the "Other."
A novel numerical tool to study electron energy distribution functions of spatially-anisotropic and non-homogeneous ECR plasmas
Creators: name: Mishra, B.
name: Pidatella, A.
name: Biri, S.
name: Galatà, A.
name: Naselli, E.
name: Rácz, R.
name: Torrisi, G.
name: Mascali, D.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: FOS: Physical sciences

description: A numerical tool for analysing spatially anisotropic electron populations in electron cyclotron resonance (ECR) plasmas has been developed, using a trial-and-error electron energy distribution function (EEDF) fitting method. The method has been tested on space-resolved warm electrons in the energy range $2-20\,\mathrm{keV}$, obtained from self-consistent simulations modelling only electron dynamics in ECR devices, but lacked real-world validation. For experimentally benchmarking the method, we attempted to numerically reproduce the experimental X-ray emission spectrum measured from an argon plasma. Results of this analysis have provided crucial information about density and temperature of warm electrons, and competing distributions of warm and hot electron components. This information can be fed back to simulation models to generate more realistic data. Subsequent application of the numerical tool as described to the improved simulation data can result in continuous EEDFs that reflect the nature of charge distributions in anisotropic ECR plasmas. These functions can be also applied to electron dependent reactions, in order to reproduce experimental results, like those concerning space-dependent K$α$ emissions.
Europa, persiste vapore nell’emisfero del mistero
Creators: Gloria Nobile
Publisher: name: Media Inaf
Year: 2021

Un ambiente come Europa, a 780 milioni di chilometri dal Sole, potrebbe ospitare la vita? Nel tentativo di rispondere a questa domanda e di comprendere appieno la struttura atmosferica delle lune ghiacciate, si fanno avanti nuovi risultati pubblicati sulla rivista Geophysical Research Letters che confermano la presenza di vapore acqueo sulla luna di Giove e ne suggeriscono la persistenza ma, misteriosamente, soltanto in uno dei suoi emisferi
Buchi neri come vulcani, fanno pure “anelli di fumo”
Creators: Ufficio stampa Inaf
Publisher: name: Media Inaf
Year: 2021

Bolle, anelli e filamenti di “fumo intergalattico”: osservate per la prima volta con grande dettaglio, queste spettacolari strutture di gas caldo tracciano l’attività ciclica dei buchi neri supermassivi indietro nel tempo fino a 200 milioni di anni fa e rivelano il loro grande impatto sull'evoluzione del mezzo intergalattico
On the Classification of Darboux Integrable Chains
Creators: name: Habibullin, Ismagil
name: Zheltukhina, Natalya
name: Pekcan, Aslı
Publisher: name: arXiv
Year: 2008
Subjects: subject: Exactly Solvable and Integrable Systems (nlin.SI)
subject: FOS: Physical sciences

description: We study differential-difference equation of the form $t_{x}(n+1)=f(t(n),t(n+1),t_x(n))$ with unknown $t=t(n,x)$ depending on $x$, $n$. The equation is called Darboux integrable, if there exist functions $F$ (called an $x$-integral) and $I$ (called an $n$-integral), both of a finite number of variables $x$, $t(n)$, $t(n\pm 1)$, $t(n\pm 2)$, $...$, $t_x(n)$, $t_{xx}(n)$, $...$, such that $D_xF=0$ and $DI=I$, where $D_x$ is the operator of total differentiation with respect to $x$, and $D$ is the shift operator: $Dp(n)=p(n+1)$. The Darboux integrability property is reformulated in terms of characteristic Lie algebras that gives an effective tool for classification of integrable equations. The complete list of equations of the form above admitting nontrivial $x$-integrals is given in the case when the function $f$ is of the special form $f(x,y,z)=z+d(x,y)$.
Galassia grande mangia galassia piccola
Creators: Ufficio stampa Inaf
Publisher: name: Media Inaf
Year: 2021

L’inesorabile legge di natura vale anche per le galassie satellite, che crescono “mangiando” galassie più piccole. Lo dimostra uno studio su Nature Astronomy, realizzato da ricercatori dell’Università di Bologna e dell’Istituto nazionale di astrofisica (Inaf), che ha individuato per la prima volta, all’interno della Grande Nube di Magellano, un ammasso stellare che ha avuto origine in una galassia diversa
Multi-layer Space Information Networks: Access Design and Softwarization
Creators: name: Al-Hraishawi, Hayder
name: Minardi, Mario
name: Chougrani, Houcine
name: Kodheli, Oltjon
name: Montoya, Jesus Fabian Mendoza
name: Chatzinotas, Symeon
Publisher: name: arXiv
Year: 2021
Subjects: subject: Signal Processing (eess.SP)
subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: In this paper, we propose an approach for constructing a multi-layer multi-orbit space information network (SIN) to provide high-speed continuous broadband connectivity for space missions (nanosatellite terminals) from the emerging space-based Internet providers. This notion has been motivated by the rapid developments in satellite technologies in terms of satellite miniaturization and reusable rocket launch, as well as the increased number of nanosatellite constellations in lower orbits for space downstream applications, such as earth observation, remote sensing, and Internet of Things (IoT) data collection. Specifically, space-based Internet providers, such as Starlink, OneWeb, and SES O3b, can be utilized for broadband connectivity directly to/from the nanosatellites, which allows a larger degree of connectivity in space network topologies. Besides, this kind of establishment is more economically efficient and eliminates the need for an excessive number of ground stations while achieving real-time and reliable space communications. This objective necessitates developing suitable radio access schemes and efficient scalable space backhauling using inter-satellite links (ISLs) and inter-orbit links (IOLs). Particularly, service-oriented radio access methods in addition to software-defined networking (SDN)-based architecture employing optimal routing mechanisms over multiple ISLs and IOLs are the most essential enablers for this novel concept. Thus, developing this symbiotic interaction between versatile satellite nodes across different orbits will lead to a breakthrough in the way that future downstream space missions and satellite networks are designed and operated.
description: arXiv admin note: text overlap with arXiv:2107.05312
Un quarto d’ora da neutroni
Creators: Maura Sandri
Publisher: name: Media Inaf
Year: 2021

L'esperimento UCNtau ha rivelato che il neutrone libero vive 14,629 minuti con un’incertezza di 0,005 minuti: una stima che è un fattore due più precisa rispetto alle misurazioni precedenti. Sebbene questo non risolva il mistero dei 9 secondi di differenza tra i due metodi solitamente impiegati per calcolare il tempo di vita del neutrone, rappresenta un altro passo verso la comprensione dell’incongruenza. Tutti i dettagli su Physical Review Letters
Se la permanenza nello spazio danneggia il cervello
Creators: Valentina Guglielmo
Publisher: name: Media Inaf
Year: 2021

L’analisi della concentrazione di alcuni biomarcatori condotta su campioni di sangue prelevati a cinque cosmonauti russi prima e dopo un lungo soggiorno sulla Stazione spaziale indica la possibilità di microlesioni ai tessuti cerebrali. Ne parliamo con uno degli autori dello studio, Henrik Zetterberg dell’università di Göteborg
Borgmeiermyia : Townsend 1936
Creators: name: Nihei, Silvio
name: Toma, Ronaldo
Publisher: name: Zenodo
Year: 2010
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Tachinidae
Borgmeiermyia

description: Key to species of Borgmeiermyia 1. Median lateral scutellar setae long, at least 2/3 length of posterior lateral scutellar setae............................................................................................. 2 – Median lateral scutellar setae short, about one-half length of posterior lateral scutellar setae (sometimes slightly longer than one-half)............................ 3 2. Male cercus and surstylus broad and cercus strongly curved dorsally at mid length in lateral view and with apex rounded (Figure 2) (Colombia, Peru, Brazil)............................................................................................. peruana – Male cercus and surstylus less broad (not as above) and cercus slightly curved dorsally in lateral view and with apex truncated (Brazil, Paraguay).............................................................................................................. paraguayana 3. Vein R 4+5 setulose dorsally between half and the whole distance to r-m crossvein, but not beyond r-m; male with outer rami of flagellomere brown and the inner rami yellow; wing costal margin with a brown continuous macula from apex of Sc to apex of R 2+3 (Figure 5) (Brazil)........................ brasiliana – Vein R 4+5 setulose dorsally far beyond r-m crossvein; male with inner and outer rami of flagellomere brown; wing costal margin with a brown macula from apex of Sc to apex of R 2+3 but this macula partially interrupted after apex of R 1 (Figure 7) (Brazil).............................................................. rozeni
description: Published as part of Nihei, Silvio & Toma, Ronaldo, 2010, Taxonomic notes on Borgmeiermyia Townsend (Diptera, Tachinidae) with the first host record for the genus, pp. 101-110 in ZooKeys 42 (42) on page 104, DOI: 10.3897/zookeys.42.190, http://zenodo.org/record/576654
Diretta verso otto asteroidi, Lucy è in volo
Creators: Redazione Media Inaf
Publisher: name: Media Inaf
Year: 2021

Lanciata ieri mattina da Cape Canaveral, la missione della Nasa da 981 milioni di dollari è diretta verso una famiglia di asteroidi di grande interesse scientifico: si ritiene infatti che gli asteroidi troiani di Giove siano ciò che resta dei materiali che hanno costituito i pianeti giganti del Sistema solare. Durata prevista: 12 anni
Quarantasette giorni di fast radio burst
Creators: Ilaria Barricella
Publisher: name: Media Inaf
Year: 2021

Catturati dal radiotelescopio Fast 1652 lampi radio veloci provenienti da Frb 121102. Il numero più alto di sempre. Grazie a un campione così elevato, gli astronomi dell’Accademia cinese delle scienze hanno potuto studiare il comportamento energetico di queste raffiche radio transitorie. L’assenza di periodicità, inoltre, suggerisce che la sorgente possa essere diversa da un oggetto compatto isolato. I risultati dello studio sono pubblicati su Nature
Anyons, Deformed Oscillator Algebras and Projectors
Creators: name: Engquist, Johan
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We initiate an algebraic approach to the many-anyon problem based on deformed oscillator algebras. The formalism utilizes a generalization of the deformed Heisenberg algebras underlying the operator solution of the Calogero problem. We define a many-body Hamiltonian and an angular momentum operator which are relevant for a linearized analysis in the statistical parameter nu. There exists a unique ground state and, in spite of the presence of defect lines, the anyonic weight lattices are completely connected by the application of the oscillators of the algebra. This is achieved by supplementing the oscillator algebra with a certain projector algebra.
description: 22 pages, 3 figures; v2: minor clarifications, references added, published in Nuclear Physics B
The concept of vision in Paul Gauguin’s Vision après le sermon
Creators: name: Viirlaid, Helle Kaja
Publisher: name: University of British Columbia
Year: 2010

description: The central concern of this thesis is the concept of vision as subject and artistic mode as a means of comprehending Paul Gauguin's Vision après le sermon of 1888. The painting in its style and imagery is argued to be a reflection of Gauguin's beliefs and aims at the time of, its execution, showing continuity in his growth and development of a visionary approach to art. The visionary aspects of the painting are presented as being most significant in revealing the nature and meaning of Vision après le sermon and placing the work into the context of its time. The evolution and development of the artist's interests and concerns up to and including 1888 are examined to demonstrate the growth of his visionary style with this work discussed as "exemplar of his manner of expression. Gauguin's own view of himself as seer and spiritual leader is explored in relationship to the late nineteenth century attitude of the artist as visionary, to suggest that he was very much a product of his time. The nineteenth century concept of dream or vision as the artist's own reality is focused upon to suggest that Gauguin's Vision après le sermon reflects 'S' the artist's perception of his personal environment. The iconographic significance of the various elements in the painting are assessed to show how Gauguin's attitudes were manifested through his use of imagery in this work - a painting which was a culminating statement in his artistic development and which clearly reflected his concerns about life and art at the time.
BepiColombo, scienza e suoni dal flyby su Mercurio
Creators: Redazione Media Inaf
Publisher: name: Media Inaf
Year: 2021

I dati raccolti dagli strumenti scientifici a bordo della sonda durante il primo sorvolo del pianeta, avvenuto a inizio ottobre, sono stati elaborati e “sonificati”. Resi pubblici oggi dall’Agenzia spaziale europea, offrono un primo assaggio della scienza della missione. Abbiamo chiesto a Carmelo Magnafico e Valeria Mangano dell’Inaf come si sono comportati gli strumenti “italiani” Isa e Serena
Operator quantum error correction for continuous dynamics
Creators: name: Oreshkov, Ognyan
name: Lidar, Daniel A.
name: Brun, Todd A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study the conditions under which a subsystem code is correctable in the presence of noise that results from continuous dynamics. We consider the case of Markovian dynamics as well as the general case of Hamiltonian dynamics of the system and the environment, and derive necessary and sufficient conditions on the Lindbladian and system-environment Hamiltonian, respectively. For the case when the encoded information is correctable during an entire time interval, the conditions we obtain can be thought of as generalizations of the previously derived conditions for decoherence-free subsystems to the case where the subsystem is time dependent. As a special case, we consider conditions for unitary correctability. In the case of Hamiltonian evolution, the conditions for unitary correctability concern only the effect of the Hamiltonian on the system, whereas the conditions for general correctability concern the entire system-environment Hamiltonian. We also derive conditions on the Hamiltonian which depend on the initial state of the environment, as well as conditions for correctability at only a particular moment of time. We discuss possible implications of our results for approximate quantum error correction.
description: 11 pages, no figures, essentially the published version, includes a new section on correctability at only a particular moment of time
On $\mathcal{OL}_\infty$ structure of nuclear, quasidiagonal C*-algebras
Creators: name: Eckhardt, Caleb
Publisher: name: arXiv
Year: 2008
Subjects: subject: Operator Algebras (math.OA)
subject: Functional Analysis (math.FA)
subject: FOS: Mathematics
subject: 46L07, 47L99

description: We continue the study of $\mathcal{OL}_\infty$ structure of nuclear $C^*$-algebras initiated by Junge, Ozawa and Ruan. In particular, we prove if $\mathcal{OL}_\infty(A)<1.005,$ then $A$ has a separating family of irreducible, stably finite representations. As an application we give examples of nuclear, quasidiagonal $C^*$-algebras $A$ with $\mathcal{OL}_\infty(A)>1.$
description: 22 pages
Linear optical Fredkin gate based on partial-SWAP gate
Creators: name: Fiurasek, Jaromir
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We propose a scheme for linear optical quantum Fredkin gate based on the combination of recently experimentally demonstrated linear optical partial SWAP gate and controlled-Z gates. Both heralded gate and simplified postselected gate operating in the coincidence basis are designed. The suggested setups have a simple structure and require stabilization of only a single Mach-Zehnder interferometer. A proof-of-principle experimental demonstration of the postselected Fredkin gate appears to be feasible and within the reach of current technology.
description: 6 pages, 3 figures, RevTeX4
Sulle tracce dei buchi neri meno attivi dell’universo
Creators: Ufficio stampa Inaf
Publisher: name: Media Inaf
Year: 2021

Uno studio guidato da Ranieri Diego Baldi dell’Inaf chiarisce l’origine dell'emissione in banda radio proveniente dai nuclei delle galassie nella porzione di universo a noi vicino, facendo finalmente chiarezza sui diversi meccanismi che danno luogo a getti e venti di materia nei pressi dei buchi neri supermassicci, compresi i fenomeni più deboli generati dai buchi neri meno attivi
Benchmark Problems for CEC2021 Competition on Evolutionary Transfer Multiobjectve Optimization
Creators: name: Liu, Songbai
name: Lin, Qiuzhen
name: Tan, Kay Chen
name: Li, Qing
Publisher: name: arXiv
Year: 2021
Subjects: subject: Neural and Evolutionary Computing (cs.NE)
subject: FOS: Computer and information sciences

description: Evolutionary transfer multiobjective optimization (ETMO) has been becoming a hot research topic in the field of evolutionary computation, which is based on the fact that knowledge learning and transfer across the related optimization exercises can improve the efficiency of others. Besides, the potential for transfer optimization is deemed invaluable from the standpoint of human-like problem-solving capabilities where knowledge gather and reuse are instinctive. To promote the research on ETMO, benchmark problems are of great importance to ETMO algorithm analysis, which helps designers or practitioners to understand the merit and demerit better of ETMO algorithms. Therefore, a total number of 40 benchmark functions are proposed in this report, covering diverse types and properties in the case of knowledge transfer, such as various formulation models, various PS geometries and PF shapes, large-scale of variables, dynamically changed environment, and so on. All the benchmark functions have been implemented in JAVA code, which can be downloaded on the following website: https://github.com/songbai-liu/etmo.
description: 20 pages, 1 figure, technical report for competition
Risveglio con meteorite nel letto
Creators: Ilaria Barricella
Publisher: name: Media Inaf
Year: 2021

La probabilità di venir colpiti da una meteora sopravvissuta al passaggio atmosferico è davvero molto ridotta. Albino Carbognani, ricercatore dell’Inaf, stima in media circa 1 morto ogni 3000 anni. Ha rischiato di rientrare in questa sfortunata statistica Ruth Hamilton, una donna canadese che la notte del 3 ottobre si è svegliata con un buco sul soffitto e un meteorite sul cuscino. Senza riportare nemmeno un graffio
Natural Numbers and Quantum States in Fock Space
Creators: name: Raffa, Francesco A.
name: Rasetti, Mario
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We investigate the expression of natural numbers in any base from a quantum point of view. In particular, resorting to the one-to-one correspondence between natural numbers and Fock states, we construct a set of multiboson operators and a set of translation operators, whose action on the Fock states leads to the coefficients identifying a natural number in any base.
description: 10 pages, no figures, submitted to Int. J. Quantum Inf
Image-Audio Encoding to Improve C2 Decision-Making in Multi-Domain Environment
Creators: name: Sharma, Piyush K.
name: Raglin, Adrienne
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: Information Theory (cs.IT)
subject: Applications (stat.AP)
subject: FOS: Computer and information sciences

description: The military is investigating methods to improve communication and agility in its multi-domain operations (MDO). Nascent popularity of Internet of Things (IoT) has gained traction in public and government domains. Its usage in MDO may revolutionize future battlefields and may enable strategic advantage. While this technology offers leverage to military capabilities, it comes with challenges where one is the uncertainty and associated risk. A key question is how can these uncertainties be addressed. Recently published studies proposed information camouflage to transform information from one data domain to another. As this is comparatively a new approach, we investigate challenges of such transformations and how these associated uncertainties can be detected and addressed, specifically unknown-unknowns to improve decision-making.
description: Published in: The 25th International Command and Control Research and Technology Symposium (ICCRTS - 2020)
O-like Stars in the Direction of the North America and Pelican Nebulae
Creators: name: Straizys, V.
name: Laugalys, V.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: In the area covering the complex of the North America and Pelican nebulae we identified 13 faint stars with J-H and H-Ks color indices which simulate heavily reddened O-type stars. One of these stars is CP05-4 classified as O5 V by Comeron and Pasquali (2005). Combining magnitudes of these stars in the passbands I, J, H, Ks and [8.3] we were able to suspect that two of them are carbon stars and five are late M-type AGB stars. Interstellar extinction in the direction of these stars was estimated from the background red clump giants in the J-H vs. H-Ks diagram and from star counts in the Ks passband. Four or five stars are found to have a considerable probability of being O-type stars, contributing to the ionization of North America and Pelican. If they really are O-type stars, their interstellar extinction A(V) should be from 16 to 35 mag. Two of them seem to be responsible for bright E and J radio rims discovered by Matthews and Goss (1980).
description: 17 pages, 6 figures
Strane pulsazioni radio dal cuore della Via Lattea
Creators: Giuseppe Fiasconaro
Publisher: name: Media Inaf
Year: 2021

Il suo segnale radio, proveniente in direzione del centro galattico, è variabile e temporaneo. Si chiama Askap J173608.2-321635 e, secondo il team di ricerca che l’ha scoperto ascoltandolo con le antenne dell’Australian Square Kilometre Array Pathfinder, potrebbe trattarsi di una nuova sorgente astronomica appartenente a una classe di oggetti conosciuta col nome di Galactic centre radio transients
Stelle binarie, doppia dose di carbonio
Creators: Gloria Nobile
Publisher: name: Media Inaf
Year: 2021

Le stelle massicce appartenenti a sistemi binari producono molto più carbonio – fino al doppio, e oltre – di quelle singole. Lo suggerisce uno studio, in uscita su The Astrophysical Journal, condotto da un gruppo di astronomi dell’università di Amsterdam e del Max Planck. I risultati mostrano l’influenza esercitata da una stella compagna sulla resa chimica della stella gigante
Per la Code Week, in arrivo il CodyMaze dell’Inaf
Creators: Redazione Media Inaf
Publisher: name: Media Inaf
Year: 2021

Da sabato 9 a domenica 24 ottobre, in tutta Europa, si celebra la Europe Code Week. Inaf è presente con diverse iniziative rivolte alle scuole e alla cittadinanza: webinar sul coding, la grande caccia tesoro online nei luoghi dell'astronomia e il CodyMaze Astrofisico, un labirinto virtuale nel mondo reale, che verrà presentato in anteprima al Festival della Scienza di Genova. Con un commento di Alessandro Bogliolo, ambasciatore del coding in Italia e coordinatore di Europe Code Week
Un gigante come Giove attorno a una stella morta
Creators: Marco Malaspina
Publisher: name: Media Inaf
Year: 2021

La scoperta di Moa-2010-Blg-477Lb, compiuta grazie al telescopio Keck II da un team guidato da Joshua Blackman dell’Università della Tasmania e pubblicata oggi su Nature, offre una visione di ciò che sarà il Sistema solare fra qualche miliardo di anni, dopo la scomparsa della Terra, quando il Sole sarà diventato una nana bianca
Oceani sì? Oceani no (nel passato di Venere)
Creators: Claudia Mignone
Publisher: name: Media Inaf
Year: 2021

Venere non è un pianeta ospitale, né oggi né in passato: in particolare, non avrebbe mai ospitato oceani di acqua liquida sulla sua superficie, come era stato invece proposto da alcuni studi negli ultimi anni. Sono i risultati di una nuova ricerca basata su simulazioni del clima venusiano, guidata da astrofisici in Svizzera e Francia e pubblicata oggi su Nature
Vulcano alle Canarie, l’eruzione vista dallo spazio
Creators: Gloria Nobile
Publisher: name: Media Inaf
Year: 2021

Continua il monitoraggio dallo spazio dell’isola di La Palma attraverso i satelliti Copernicus Sentinel dell’Agenzia spaziale europea dell’Esa. Le nubi di cenere che si sono sollevate nei giorni scorsi hanno raggiunto anche l’Osservatorio del Roque de Los Muchachos, senza però causare alcun danno alla struttura che ospita il Tng, dice il direttore del telescopio Ennio Poretti
First models of s process in AGB stars of solar metallicity for the stellar evolutionary code ATON with a novel stable explicit numerical solver
Creators: name: López, A. Yagüe
name: García-Hernández, D. A.
name: Ventura, P.
name: Doherty, C. L.
name: Hartogh, J. W. den
name: Jones, S. W.
name: Lugaro, M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Aims. We describe the first s-process post-processing models for asymptotic giant branch (AGB) stars of masses 3, 4 and 5 M at solar metallicity (Z=0.018) computed using the input from the stellar evolutionary code aton. Methods. The models are computed with the new code snuppat(S-process NUcleosynthesis Post-Processing code for aton), including an advective scheme for the convective overshoot that leads to the formation of the main neutron source, 13C. Each model is post-processed with 3 different values of the free overshoot parameter. Included in the code snuppat is the novel Patankar-Euler-Deflhard explicit numerical solver, that we use to solve the nuclear network system of differential equations. Results. The results are compared to those from other s-process nucleosynthesis codes (Monash,fruity, and NuGrid), as well as observations of s-process enhancement in AGB stars, planetary nebulae, and barium stars. This comparison shows that the relatively high abundance of12C in the He-rich intershell in aton results in as-process abundance pattern that favours the second over the first s-process peak for all the masses explored. Also, our choice of an advective as opposed to diffusive numerical scheme for the convective overshoot results in significants-process nucleosynthesis also for the 5 M models, which may be in contradiction with observations.
description: 19 pages, 11 figures, 2 appendices
Polvere di stelle antiche
Creators: Ilaria Barricella
Publisher: name: Media Inaf
Year: 2021

Sono stati analizzati i grani di polvere di stelle provenienti dal meteorite di Murchison e ne è stata rivelata la composizione isotopica di alcuni atomi grazie a uno spettrometro di massa di ultima generazione. I risultati di questo nuovo studio, pubblicati ieri su ApJL, sanano una discrepanza tra le osservazioni spettroscopiche e le misure in laboratorio di questi grani, che provengono da stelle di carbonio con composizione chimica peculiare, antecedenti alla formazione del Sistema solare. Tra gli autori anche Sergio Cristallo dell’Inaf d’Abruzzo
La prima animazione radio di un sistema binario
Creators: Maura Sandri
Publisher: name: Media Inaf
Year: 2021

Per la prima volta, un gruppo di ricercatori ha utilizzato i dati di Alma per creare un’animazione radioastronomica che riproduce il movimento relativo delle due stelle del sistema binario XZ Tauri nell'arco di tre anni. Tale animazione contribuisce a chiarire alcuni aspetti sulle origini delle stelle binarie e sui pianeti che si formeranno intorno a esse. Tutti i dettagli su ApJ
Arte e scienza in mostra a Roma
Creators: Claudia Mignone
Publisher: name: Media Inaf
Year: 2021

Apre oggi le porte al pubblico “Tre stazioni per Arte-Scienza” al Palazzo delle Esposizioni di Roma, un percorso articolato in tre mostre che esplorano rispettivamente una prospettiva artistica sulla scienza, le sfide della ricerca contemporanea e la storia della scienza nella capitale. In mostra strumenti, volumi e altri oggetti d'epoca dalle collezioni del Museo astronomico e copernicano dell'Inaf
Con Lofar, segnali radio da pianeti distanti
Creators: Giuseppe Fiasconaro
Publisher: name: Media Inaf
Year: 2021

Utilizzando le antenne del radiotelescopio Lofar per “ascoltare” i segnali provenienti da 19 nane rosse lontane, un team di astronomi guidati dall’Università del Queensland (Australia) e dall'istituto di radioastronomia olandese Astron ha rilevato emissioni radio aurorali provenire da quattro delle stelle studiate, indicando la possibile presenza di sistemi stella-pianeta
Asteroidi ne abbiamo? La risposta è 42
Creators: Redazione Eso
Publisher: name: Media Inaf
Year: 2021

Lo strumento Sphere montato sul Very Large Telescope dell’Eso, in Cile, ha consentito di ottenere immagini straordinariamente nitide di quarantadue grandi asteroidi, consentendo anche di calcolare con precisione la densità di alcuni di essi. Lo studio è stato pubblicato oggi su Astronomy & Astrophysics da un team guidato da Pierre Vernazza del Laboratoire d’Astrophysique di Marsiglia
Collisione in diretta nel cuore di Perseo
Creators: Ufficio stampa Inaf
Publisher: name: Media Inaf
Year: 2021

Per la prima volta è stato possibile osservare, con la tecnica Vlbi, la drammatica interazione fra un getto relativistico e l’ambiente circostante. Il fenomeno si chiama feedback ed è fondamentale per regolare la crescita simultanea di galassie e buchi neri supermassicci. Il giovane getto è stato generato dal buco nero supermassiccio al centro della sorgente radio 3C 84, e si è scontrato con una nube di gas ad alta densità. I dati sono stati pubblicati su ApJ Letters
Lucy, verso là dov’è lontano solo prima d’arrivare
Creators: Marco Malaspina
Publisher: name: Media Inaf
Year: 2021

Otto asteroidi in una sola missione. È l’ambizioso obiettivo di Lucy, sonda spaziale della Nasa pronta a lasciare la Terra, se tutto va secondo i piani, all’alba del 16 ottobre. Nel team scientifico c’è uno scienziato originario di Lucca, Simone Marchi, oggi ricercatore al Southwest Research Institute di Boulder, in Colorado. Lo abbiamo raggiunto a Cape Canaveral, dove si trova per seguire le ultime fasi della missione
Centinaia di blazar all’origine di quei raggi gamma
Creators: Ufficio stampa Inaf
Publisher: name: Media Inaf
Year: 2021

Un team internazionale di astronomi, tra cui ricercatrici e ricercatori italiani dell’Università di Torino, dell’Università di Bologna e dell’Istituto nazionale di astrofisica, ha svelato la natura di molte sorgenti che emettono raggi gamma, scoprendo che la maggior parte di esse appartiene alla classe dei blazar, galassie attive che ospitano nelle loro regioni centrali un buco nero supermassiccio, il “motore” che alimenta le loro poderose emissioni di radiazione d’alta energia. I risultati sono stati ottenuti anche grazie alle osservazioni del telescopio Lamost in Cina
Measurement-induced entanglement of two superconducting qubits
Creators: name: Li, Jian
name: Chalapat, K.
name: Paraoanu, G. S.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Superconductivity (cond-mat.supr-con)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study the problem of two superconducting quantum qubits coupled via a resonator. If only one quanta is present in the system and the number of photons in the resonator is measured with a null result, the qubits end up in an entangled Bell state. Here we look at one source of errors in this quantum nondemolition scheme due to the presence of more than one quanta in the resonator, previous to the measurement. By analyzing the structure of the conditional Hamiltonian with arbitrary number of quanta, we show that the scheme is remarkably robust against these type of errors.
description: 4 pages, 2 figures
Collisioni mordi e fuggi alla base del Sistema solare
Creators: Ilaria Barricella
Publisher: name: Media Inaf
Year: 2021

Pubblicato su The Planetary Science Journal un nuovo quadro teorico per spiegare la formazione e la crescita dei pianeti che risiedono nel Sistema solare interno. «Usando l'intelligenza artificiale, dimostriamo che in realtà i pianeti si schiantano e rimbalzano l'uno contro l'altro, per poi collidere di nuovo in un secondo momento», dice Saverio Cambioni a Media Inaf. Lo stesso team di scienziati del Lunar and Planetary Laboratory ha proposto anche uno scenario sulla nascita della Luna che integra il modello convenzionale con nuovi dati. Il nostro satellite naturale si sarebbe formato da un secondo scontro con un corpo celeste chiamato Theia
L’antico delta del fiume nel cratere Jezero
Creators: Maura Sandri
Publisher: name: Media Inaf
Year: 2021

La prima analisi scientifica delle immagini scattate dal rover Perseverance della Nasa ha confermato che il cratere Jezero un tempo doveva essere dimora di un tranquillo lago alimentato da un piccolo fiume. Le immagini evidenziano inoltre che il lago deve aver subito inondazioni potenti e improvvise, che hanno trasportato grandi massi per decine di chilometri da monte fino a valle, depositandoli nel fondo del lago, dove giacciono tuttora. Tutti i dettagli su Science
La Terra riflette meno e si scalda di più
Creators: Valentina Guglielmo
Publisher: name: Media Inaf
Year: 2021

Secondo un nuovo studio pubblicato su Geophysical Research Letters, il riscaldamento delle acque oceaniche del Pacifico orientale ha causato un calo dell’albedo della Terra. La quantità di energia solare assorbita dal nostro pianeta va aumentando, e con essa le temperature, in un pericoloso meccanismo di feedback positivo che ha sorpreso anche gli scienziati
Schrödinger Operators Defined by Interval Exchange Transformations
Creators: name: Chaika, Jon
name: Damanik, David
name: Krueger, Helge
Publisher: name: arXiv
Year: 2008
Subjects: subject: Spectral Theory (math.SP)
subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics

description: We discuss discrete one-dimensional Schrödinger operators whose potentials are generated by an invertible ergodic transformation of a compact metric space and a continuous real-valued sampling function. We pay particular attention to the case where the transformation is a minimal interval exchange transformation. Results about the spectrum and the spectral type of these operators are established. In particular, we provide the first examples of transformations for which the associated Schrödinger operators have purely singular spectrum for every non-constant continuous sampling function.