cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Deformations of constant scalar curvature Sasakian metrics and K-stability
Creators: name: Tipler, Carl
name: van Coevering, Craig
Publisher: name: arXiv
Year: 2013
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: Primary 53C25, Secondary 32Q20

description: Extending the work of G. Székelyhidi and T. Brönnle to Sasakian manifolds we prove that a small deformation of the complex structure of the cone of a constant scalar curvature Sasakian manifold admits a constant scalar curvature structure if it is K-polystable. This also implies that a small deformation of the complex structure of the cone of a constant scalar curvature structure is K-semistable. As applications we give examples of constant scalar curvature Sasakian manifolds which are deformations of toric examples, and we also show that if a 3-Sasakian manifold admits a non-trivial transversal complex deformation then it admits a non-trivial Sasaki-Einstein deformation.
description: to appear in International Mathematics Research Notices
Martina Tremenda nello spazio
Creators: Redazione Media Inaf
Publisher: name: Media Inaf
Year: 2022

Sono disponibili da oggi, sulle principali piattaforme e sul sito dedicato, le prime sei puntate del podcast Martina Tremenda nello spazio, realizzato dall’Inaf in collaborazione con l’associazione teatrale Realtà Debora Mancini, una produzione unica nel panorama italiano
On the Role of Regularization in Machine Learning: Classical Theory, Computational Aspects and Modern Regimes
Creators: name: PAGLIANA, NICOLO'
Publisher: name: Universit� degli studi di Genova
Year: 2022

description: In this work we study performances of different machine learning models by focusing on regularization properties in order to explain different phenomena that are observed in practice. We consider linear models on possibly infinite dimensionale feature space that are trained by optimizing an empirical mean squared errror. We study regularization properties of accelerated method like Nesterov or $ u$-method and properties of interpolating estimator where the main regularization sources vanish to zero and explain different behaviour which can be seen in practical applications.
Randomized Benchmarking with Confidence
Creators: name: Wallman, Joel J.
name: Flammia, Steven T.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Randomized benchmarking is a promising tool for characterizing the noise in experimental implementations of quantum systems. In this paper, we prove that the estimates produced by randomized benchmarking (both standard and interleaved) for arbitrary Markovian noise sources are remarkably precise by showing that the variance due to sampling random gate sequences is small. We discuss how to choose experimental parameters, in particular the number and lengths of random sequences, in order to characterize average gate errors with rigorous confidence bounds. We also show that randomized benchmarking can be used to reliably characterize time-dependent Markovian noise (e.g., when noise is due to a magnetic field with fluctuating strength). Moreover, we identify a necessary property for time-dependent noise that is violated by some sources of non-Markovian noise, which provides a test for non-Markovianity.
description: 31 pages, 1 figure. v2: clarifications, refs added. v3: typos fixed, results unchanged
Lothar Graf zu Dohna, Richard Wetzel: Staupitz, theologischer Lehrer Luthers
Creators: name: Reinert, Jonathan
Publisher: name: Rottenburger Jahrbuch für Kirchengeschichte
Year: 2023

description: Rottenburger Jahrbuch für Kirchengeschichte, Bd. 38 (2019): Rottenburger Jahrbuch für Kirchengeschichte, Band 38
Johan Huizinga: Herbst des Mittelalters
Creators: name: Prietzel, Malte
Publisher: name: Rottenburger Jahrbuch für Kirchengeschichte
Year: 2023

description: Rottenburger Jahrbuch für Kirchengeschichte, Bd. 38 (2019): Rottenburger Jahrbuch für Kirchengeschichte, Band 38
Convex Optimization: Algorithms and Complexity
Creators: name: Bubeck, Sébastien
Publisher: name: arXiv
Year: 2014
Subjects: subject: Optimization and Control (math.OC)
subject: Computational Complexity (cs.CC)
subject: Machine Learning (cs.LG)
subject: Numerical Analysis (math.NA)
subject: Machine Learning (stat.ML)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences

description: This monograph presents the main complexity theorems in convex optimization and their corresponding algorithms. Starting from the fundamental theory of black-box optimization, the material progresses towards recent advances in structural optimization and stochastic optimization. Our presentation of black-box optimization, strongly influenced by Nesterov's seminal book and Nemirovski's lecture notes, includes the analysis of cutting plane methods, as well as (accelerated) gradient descent schemes. We also pay special attention to non-Euclidean settings (relevant algorithms include Frank-Wolfe, mirror descent, and dual averaging) and discuss their relevance in machine learning. We provide a gentle introduction to structural optimization with FISTA (to optimize a sum of a smooth and a simple non-smooth term), saddle-point mirror prox (Nemirovski's alternative to Nesterov's smoothing), and a concise description of interior point methods. In stochastic optimization we discuss stochastic gradient descent, mini-batches, random coordinate descent, and sublinear algorithms. We also briefly touch upon convex relaxation of combinatorial problems and the use of randomness to round solutions, as well as random walks based methods.
description: A previous version of the manuscript was titled "Theory of Convex Optimization for Machine Learning"
Jürgen Miethke (Hrsg.): Marsilius von Padua, Der Verteidiger des Friedens
Creators: name: Eberl, Immo
Publisher: name: Rottenburger Jahrbuch für Kirchengeschichte
Year: 2023

description: Rottenburger Jahrbuch für Kirchengeschichte, Bd. 38 (2019): Rottenburger Jahrbuch für Kirchengeschichte, Band 38
Perseverance trova molecole organiche su Marte
Creators: Claudia Mignone
Publisher: name: Media Inaf
Year: 2022

Il rover Perseverance della Nasa ha rivelato la presenza di molecole organiche in alcuni campioni di roccia prelevati durante la sua seconda campagna scientifica su Marte, iniziata lo scorso 7 luglio. La scoperta è stata realizzata grazie allo strumento Sherloc in un'area del cratere Jezero tra le più promettenti per la ricerca di possibili tracce di vita microbica passata sul Pianeta rosso
title: A Group-Based 8-Week Functional Interval-Type Outdoor Training Program Improves Physical Performance in Recreationally Active Adults
Creators: name: Hendker, Anna
name: Eils, Eric
Publisher: name: University of Muenster, Institutional Repository MIAMI
Year: 2022
Subjects: subject: 790 Recreational and performing arts

description: Even though physical activity is an important aspect of health, lack of time or motivation impede people from working out regularly. One type of training program that is both efficient and motivating is functional interval-type outdoor training. To evaluate this, our study had 81 participants complete a battery of physical performance tests (incremental treadmill test, core stability test and functional fitness test) before and after an 8-week outdoor interval-type training intervention. Training procedures included multimodal and high-intensity exercises performed in consistent, small groups. Results showed that the interval training program produced significant increases in the intervention group (n = 43) in functional and strength exercises (p < 0.001; squat (+27%), burpee (+24%), bridge (+39%), push-up (+34%), sit-up (+25%), high knees (+25%), row (+19%), effect sizes 0.4–0.11) for almost all parameters in comparison to a non-intervention control population (n = 38). Interestingly, trunk stability increased significantly (p < 0.001; flexion (+86%), extension (+43%), lateral left (+39%), lateral right (+32%), effect sizes 0.3–0.15) even though it was not explicitly trained; this was rather a secondary outcome of the functional exercises. Drop-out rates (Intervention group: 27%) suggest that this form of training seems to improve adherence to exercise and may help participants to stay committed to regular, intense activity. By simultaneously triggering adaptations in functional fitness, endurance and whole-body movements, this program can be used by people at different training levels.
description: Finanziert durch den Open-Access-Publikationsfonds der Westfälischen Wilhelms-Universität Münster (WWU Münster).
Constraints on a $ϕ$CDM model from strong gravitational lensing and updated Hubble parameter measurements
Creators: name: Chen, Yun
name: Geng, Chao-Qiang
name: Cao, Shuo
name: Huang, Yu-Mei
name: Zhu, Zong-Hong
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We constrain the scalar field dark energy model with an inverse power-law potential, i.e., $V(ϕ)\propto ϕ^{-α}$ ($α>0$), from a set of recent cosmological observations by compiling an updated sample of Hubble parameter measurements including 30 independent data points. Our results show that the constraining power of the updated sample of $H(z)$ data with the HST prior on $H_0$ is stronger than those of the SCP Union2 and Union2.1 compilations. A recent sample of strong gravitational lensing systems is also adopted to confine the model even though the results are not significant. A joint analysis of the strong gravitational lensing data with the more restrictive updated Hubble parameter measurements and the Type Ia supernovae data from SCP Union2 indicates that the recent observations still can not distinguish whether dark energy is a time-independent cosmological constant or a time-varying dynamical component.
description: 21 pages, 3 figures, revised version accepted by JCAP
Landesarchiv Baden-Württemberg (Hrsg.): Barbara Gonzaga: Die Briefe / Le Lettere (1455-1508)
Creators: name: Gallion, Nina
Publisher: name: Rottenburger Jahrbuch für Kirchengeschichte
Year: 2023

description: Rottenburger Jahrbuch für Kirchengeschichte, Bd. 38 (2019): Rottenburger Jahrbuch für Kirchengeschichte, Band 38
Sigrid Hirbodian, Tjark Wegner (Hrsg.): Tübingen
Creators: name: Köpf, Ulrich
Publisher: name: Rottenburger Jahrbuch für Kirchengeschichte
Year: 2023

description: Rottenburger Jahrbuch für Kirchengeschichte, Bd. 38 (2019): Rottenburger Jahrbuch für Kirchengeschichte, Band 38
James Webb, sei troppo avanti
Creators: Valentina Guglielmo
Publisher: name: Media Inaf
Year: 2022

Per sfruttare a pieno le capacità di scoperta del telescopio spaziale James Webb, occorre lavorare su più fronti, e perfezionare la nostra conoscenza rispetto ad alcune situazioni fisiche che si verificano nelle atmosfere degli esopianeti. Il rischio è di interpretare male i dati
Uwe Niedersen (Hrsg.): Reformation in Kirche und Staat
Creators: name: Jung, Martin H.
Publisher: name: Rottenburger Jahrbuch für Kirchengeschichte
Year: 2023

description: Rottenburger Jahrbuch für Kirchengeschichte, Bd. 38 (2019): Rottenburger Jahrbuch für Kirchengeschichte, Band 38
Il test più preciso del principio di equivalenza
Creators: Claudia Mignone
Publisher: name: Media Inaf
Year: 2022

Il principio di equivalenza debole, alla base della teoria della relatività generale di Einstein, sopravvive a un altro test, il più rigoroso mai realizzato, basato sui dati raccolti dal satellite francese Microscope tra il 2016 e il 2018. I risultati, presentati in una serie di articoli sulle riviste Physical Review Letters e Classical and Quantum Gravity, escludono qualsiasi deviazione dall'attuale comprensione della relatività generale a meno di una parte su mille milioni di milioni
Manfred Lütz: Der Skandal der Skandale
Creators: name: Henkelmann, Andreas
Publisher: name: Rottenburger Jahrbuch für Kirchengeschichte
Year: 2023

description: Rottenburger Jahrbuch für Kirchengeschichte, Bd. 38 (2019): Rottenburger Jahrbuch für Kirchengeschichte, Band 38
La “barra” di Orione erosa dai raggi ultravioletti
Creators: Paolo Soletta
Publisher: name: Media Inaf
Year: 2022

Nuove spettacolari immagini dal James Webb Telescope: un gruppo di studio a guida franco-canadese, a cui partecipano anche tre ricercatori Inaf, ha prodotto una prima analisi sui dati relativi alla Nebulosa di Orione e, in particolare, a una zona chiamata “barra di Orione”. Grazie a una fortunata configurazione di prospettive, queste immagini potranno essere la base per nuove pubblicazioni scientifiche, spiega Giacomo Mulas dell’Inaf di Cagliari
Così Giove può modificare l’abitabilità della Terra
Creators: Giuseppe Fiasconaro
Publisher: name: Media Inaf
Year: 2022

Mediante modelli che simulano il comportamento dei sistemi planetari, un gruppo di ricerca guidato dall'Università della California - Riverside ha scoperto che le modifiche nella forma dell'orbita di Giove inducono cambiamenti nell'orbita della Terra che possono tradursi in una aumentata abitabilità planetaria
Cristoforetti comandante della Stazione spaziale
Creators: Redazione Ansa
Publisher: name: Media Inaf
Year: 2022

Lo annuncia l'Esa. Sarà la prima donna europea con questa carica. «Sono onorata della mia nomina a comandante, non vedo l'ora di attingere all'esperienza che ho acquisito nello spazio e sulla Terra per guidare una squadra molto capace in orbita» ha detto l'astronauta italiana
Subproduct systems and Cartesian systems; new results on factorial languages and their relations with other areas
Creators: name: Gerhold, Malte
name: Skeide, Michael
Publisher: name: arXiv
Year: 2014
Subjects: subject: Functional Analysis (math.FA)
subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 46L57, 68R15, 05A05, 46L55, 05A15

description: We point out that a sequence of natural numbers is the dimension sequence of a subproduct system if and only if it is the cardinality sequence of a word system (or factorial language). Determining such sequences is, therefore, reduced to a purely combinatorial problem in the combinatorics of words. A corresponding (and equivalent) result for graded algebras has been known in abstract algebra, but this connection with pure combinatorics has not yet been noticed by the product systems community. We also introduce Cartesian systems, which can be seen either as a set theoretic version of subproduct systems or an abstract version of word systems. Applying this, we provide several new results on the cardinality sequences of word systems and the dimension sequences of subproduct systems.
description: New title; added references; to appear in Journal of Stochastic Analysis
Coherence Optimization and Best Complex Antipodal Spherical Codes
Creators: name: Zörlein, Henning
name: Bossert, Martin
Publisher: name: arXiv
Year: 2014
Subjects: subject: Information Theory (cs.IT)
subject: FOS: Computer and information sciences

description: Vector sets with optimal coherence according to the Welch bound cannot exist for all pairs of dimension and cardinality. If such an optimal vector set exists, it is an equiangular tight frame and represents the solution to a Grassmannian line packing problem. Best Complex Antipodal Spherical Codes (BCASCs) are the best vector sets with respect to the coherence. By extending methods used to find best spherical codes in the real-valued Euclidean space, the proposed approach aims to find BCASCs, and thereby, a complex-valued vector set with minimal coherence. There are many applications demanding vector sets with low coherence. Examples are not limited to several techniques in wireless communication or to the field of compressed sensing. Within this contribution, existing analytical and numerical approaches for coherence optimization of complex-valued vector spaces are summarized and compared to the proposed approach. The numerically obtained coherence values improve previously reported results. The drawback of increased computational effort is addressed and a faster approximation is proposed which may be an alternative for time critical cases.
Jens Holger Schjørring, Norman A. Hjelm (Hrsg.): Geschichte des globalen Christentums
Creators: name: Schubert, Anselm
Publisher: name: Rottenburger Jahrbuch für Kirchengeschichte
Year: 2023

description: Rottenburger Jahrbuch für Kirchengeschichte, Bd. 38 (2019): Rottenburger Jahrbuch für Kirchengeschichte, Band 38
Quantum Brownian motion model for the stock market
Creators: name: Meng, Xiangyi
name: Zhang, Jian-Wei
name: Guo, Hong
Publisher: name: arXiv
Year: 2014
Subjects: subject: General Finance (q-fin.GN)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Economics and business
subject: FOS: Physical sciences

description: It is believed by the majority today that the efficient market hypothesis is imperfect because of market irrationality. Using the physical concepts and mathematical structures of quantum mechanics, we construct an econophysics framework for the stock market, based on which we analogously map massive numbers of single stocks into a reservoir consisting of many quantum harmonic oscillators and their stock index into a typical quantum open system--a quantum Brownian particle. In particular, the irrationality of stock transactions is quantitatively considered as the Planck constant within Heisenberg's uncertainty relationship of quantum mechanics in an analogous manner. We analyze real stock data of Shanghai Stock Exchange of China and investigate fat-tail phenomena and non-Markovian behaviors of the stock index with the assistance of the quantum Brownian motion model, thereby interpreting and studying the limitations of the classical Brownian motion model for the efficient market hypothesis from a new perspective of quantum open system dynamics.
Fuel cell systems for marine applications
Creators: name: LAMBERTI, THOMAS
Publisher: name: Universit� degli studi di Genova
Year: 2018

description: The aim of this work is the assessment of the most suitable hydrogen solution for ship applications and the definition of the role of hydrogen as alternative fuel for shipping. The importance of the ?Hydrogen Technologies? for ships comes from the most important social challenge that is driving innovation in the shipping sector: Environmental Challenge. The PhD research project encountered important development both from the industrial and the academic side that brought to the construction of a joint laboratory between Fincantieri and the Polytechnic School of the University of Genoa, the: HI-SEA laboratory, dedicated to the study of fuel cell system for marine application. Moreover the simulation modelling and experimental results developed during the PhD research on the PEM fuel cell and MH hydrogen storage systems, found an application in the nautical sector. The former brought to a patent and the creation of a dedicated start-up company named H2Boat, that was recognised as University spin-off. The first part of the study define the role of hydrogen as alternative energy vector (fuel) for marine application, analysing the complex context in which it is supposed to be used. In part 2.1 a detailed assessment of the characteristics of different alternative fuels have been conducted. The complexity of work brought to the construction of comparative models, descripted in part 2.2 that have been used to analyse the characteristic of various alternative solution. An analysis of the PEM FCS state of the art is presented in part 2.3 together with the definition of FCS design for marine application in part 2.4. The study of the hydrogen technologies considered also the definition of simulation models of fuel cell systems and metal hydride hydrogen storage system 3.2. The former has also been assessed towards experimental tests, presented in part 3.3. The models have been used to develop larger laboratory, to define correct operative parameters and FCS design. Finally a number of application developed during the PhD study are proposed in part 4 to show the goal of the research that is still under development.
‘Le luci di Horn’ in mostra a Milano
Creators: Redazione Media Inaf
Publisher: name: Media Inaf
Year: 2022

Approda all’Inaf – Osservatorio Astronomico di Brera la mostra ‘Le luci di Horn: Un'eredità preziosa’, dedicata alla figura di Guido Horn d’Arturo (Trieste 1879-Bologna 1967), oggi riconosciuto come il padre degli specchi a “tasselli” per telescopi riflettori di grandi dimensioni
Arnold Angenendt: »Lasst beides wachsen bis zur Ernte ...« Toleranz in der Geschichte des Christentums
Creators: name: Böttigheimer, Christoph
Publisher: name: Rottenburger Jahrbuch für Kirchengeschichte
Year: 2023

description: Rottenburger Jahrbuch für Kirchengeschichte, Bd. 38 (2019): Rottenburger Jahrbuch für Kirchengeschichte, Band 38
Neurorehabilitation in Multiple Sclerosis: insights into fatigue and motor function
Creators: name: GERVASONI, ELISA
Publisher: name: Universit� degli studi di Genova
Year: 2018

description: About this work This doctoral project aims to improve the overall knowledge on the effects of neurorehabilitation in People with Multiple Sclerosis (PwMS), by providing more insights on fatigue and the relationship between fatigue and motor functional aspects. The general introduction provides background information on the main topics of this doctoral project. In the first part, the specific disease characteristics of Multiple Sclerosis are described. In the second part, the current status of fatigue and motor impairment and a focus on the management are presented. Finally, the aims and outline thesis are reported. Four studies were conducted and reported in 4 different chapters. The first study provides information about the cardiac autonomic function during rest, postural changes and exercise and the relationship between autonomic modulation of heart rate and the perceived fatigue. The second study investigates the effect of an experimental rehabilitation protocol which combines aerobic training and task oriented exercises aimed to reduce fatigue and improve upper limb impairments and function. The third study provides information about preliminary effects of a high-intensity rehabilitative multimodal training protocol carried out on a treadmill aimed at improving mobility and balance. The fourth study shows the effectiveness of functional electrical stimulation on reducing falls, improving gait kinematics and promoting energy recovery. Lastly, general conclusions, including main findings and clinical implications, are provided at the end of the doctoral thesis.
Central limit theorems for directional and linear random variables with applications
Creators: name: García-Portugués, Eduardo
name: Crujeiras, Rosa M.
name: González-Manteiga, Wenceslao
Publisher: name: arXiv
Year: 2014
Subjects: subject: Methodology (stat.ME)
subject: FOS: Computer and information sciences
subject: 62G10, 62H11, 62G07, 62G09

description: A central limit theorem for the integrated squared error of the directional-linear kernel density estimator is established. The result enables the construction and analysis of two testing procedures based on squared loss: a nonparametric independence test for directional and linear random variables and a goodness-of-fit test for parametric families of directional-linear densities. Limit distributions for both test statistics, and a consistent bootstrap strategy for the goodness-of-fit test, are developed for the directional-linear case and adapted to the directional-directional setting. Finite sample performance for the goodness-of-fit test is illustrated in a simulation study. This test is also applied to datasets from biology and environmental sciences.
description: Paper: 19 pages, 5 figures, 1 table. Supplementary material: 46 pages, 7 figures, 5 tables
La scelta lunare di Kennedy
Creators: Patrizia Caraveo
Publisher: name: Media Inaf
Year: 2022

Grandi discorsi. A Houston, 60 anni fa, il presidente degli Stati Uniti John Fitzgerald Kennedy spiegò a 40mila giovani che gli Usa avrebbero investito nello spazio per essere i primi a vincere la sfida. Ne parla l’astrofisica Patrizia Caraveo in un articolo pubblicato domenica scorsa sul Sole24Ore che, con il consenso dell'autrice, vi riproponiamo oggi su Media Inaf
Constraints on dark energy from the CSST galaxy clusters
Creators: name: Zhang, Yufei
name: Chen, Mingjing
name: Wen, Zhonglue
name: Fang, Wenjuan
Publisher: name: arXiv
Year: 2023
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: We study the potential of the galaxy cluster sample expected from the China Space Station Telescope (CSST) survey to constrain dark energy properties. By modelling the distribution of observed cluster mass for a given true mass to be log-normal and adopting a selection threshold in the observed mass $M_{200m} \geq 0.836 \times 10^{14} h^{-1}M_{\odot}$, we find about $4.1 \times 10^{5}$ clusters in the redshift range $0 \leq z \leq 1.5$ can be detected by the CSST. We construct the Fisher matrix for the cluster number counts from CSST, and forecast constraints on dark energy parameters for models with constant ($w_0$CDM) and time dependent ($w_0w_a$CDM) equation of state. In the self-calibration scheme, the dark energy equation of state parameter $w_0$ of $w_0$CDM model can be constrained to $Δw_0 = 0.036$. If $w_a$ is added as a free parameter, we obtain $Δw_0 = 0.077$ and $Δw_a = 0.39$ for the $w_0w_a$CDM model, with a Figure of Merit for ($w_0,w_a$) to be 68.99. Should we had perfect knowledge of the observable-mass scaling relation (``known SR" scheme), we would obtain $Δw_0 = 0.012$ for $w_0$CDM model, $Δw_0 = 0.062$ and $Δw_a = 0.24$ for $w_0w_a$CDM model. The dark energy Figure of Merit of ($w_0,w_a$) increases to 343.25. By extending the maximum redshift of the clusters from $z_{max} \sim 1.5$ to $z_{max} \sim 2$, the dark energy Figure of Merit for ($w_0,w_a$) increases to 89.72 (self-calibration scheme) and 610.97 (``known SR" scheme), improved by a factor of $\sim 1.30$ and $\sim 1.78$, respectively. We find that the impact of clusters' redshift uncertainty on the dark energy constraints is negligible as long as the redshift error of clusters is smaller than 0.01, achievable by CSST. We also find that the bias in logarithm mass must be calibrated to be $0.30$ or better to avoid significant dark energy parameter bias.
description: 19 pages, 5 figures, 4 tables. Accepted for publication in Research in Astronomy and Astrophysics
Misteriosi e indistruttibili diamanti dallo spazio
Creators: Laura Leonardi
Publisher: name: Media Inaf
Year: 2022

Una nuova ricerca ha identificato la presenza di diamanti esagonali, noti come lonsdaleite, in una rara classe di meteoriti, probabilmente provenienti da un antico pianeta nano. La loro insolita struttura atomica li renderebbe più duri dei diamanti terrestri. I risultati sono stati stati pubblicati su Proceedings of the National Academy of Sciences.
Character and object
Creators: name: Avigad, Jeremy
name: Morris, Rebecca
Publisher: name: arXiv
Year: 2014
Subjects: subject: History and Overview (math.HO)
subject: FOS: Mathematics
subject: 01A55, 00A30, 00A35

description: In 1837, Dirichlet proved that there are infinitely many primes in any arithmetic progression in which the terms do not all share a common factor. Modern presentations of the proof are explicitly higher-order, in that they involve quantifying over and summing over Dirichlet characters, which are certain types of functions. The notion of a character is only implicit in Dirichlet's original proof, and the subsequent history shows a very gradual transition to the modern mode of presentation. In this essay, we describe an approach to the philosophy of mathematics in which it is an important task to understand the roles of our ontological posits and assess the extent to which they enable us to achieve our mathematical goals. We use the history of Dirichlet's theorem to understand some of the reasons that functions are treated as ordinary objects in contemporary mathematics, as well as some of the reasons one might want to resist such treatment. We also use these considerations to illuminate the formal treatment of functions and objects in Frege's logical foundation, and we argue that his philosophical and logical decisions were influenced by many of the same factors.
Quantum gravitational corrected evolution equations of charged black holes
Creators: name: Delgado, Ruben Campos
Publisher: name: arXiv
Year: 2023
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We explain how quantum gravity, treated as an effective field theory, might modify the evaporative evolution of a four-dimensional, non-extremal, non-rotating, charged black hole. With some approximations, we derive a set of coupled differential equations describing the charge and mass of the black hole as a function of time. These equations represent a generalisation of the analogous ones already present in the literature for classical black holes.
description: 12 pages; accepted for publication in JHAP
Laser potentissimi dritti al cuore delle nane rosse
Creators: Giuseppe Fiasconaro
Publisher: name: Media Inaf
Year: 2022

In un recente articolo pubblicato sulla rivista Physics of Plasmas, un team di ricercatori del Lawrence Livermore National Laboratory descrive un nuovo esperimento per studiare la fisica in azione nelle profondità delle nane rosse e far luce sui meccanismi di trasporto dell'energia prodotta da queste piccole fornaci nucleari
Graphene armchair nanoribbon single-electron transistors: The peculiar influence of end states
Creators: name: Koller, Sonja
name: Mayrhofer, Leonhard
name: Grifoni, Milena
Publisher: name: Universität Regensburg
Year: 2009
Subjects: subject: 530 Physik

description: Abstract – We present a microscopic theory for interacting graphene armchair nanoribbon quantum dots. Long-range interaction processes are responsible for Coulomb blockade and spin-charge separation. Short-range ones, arising from the underlying honeycomb lattice of graphene smear the spin-charge separation and induce exchange correlations between bulk electrons —delocalized on the ribbon— and single electrons localized at the two ends. As a consequence, entangled end-bulk states where the bulk spin is no longer a conserved quantity occur. Entanglement’s signature is the occurrence of negative differential conductance effects in a fully symmetric set-up due to symmetry-forbidden transitions.
L’occhio di Draco punta Didymos
Creators: Guido Sbrogiò
Publisher: name: Media Inaf
Year: 2022

Sono giunte a terra nei giorni scorsi le prime immagini dell'asteroide Didymos scattate direttamente dalle camera a bordo di Dart. La sonda si sta avvicinando al sistema binario di asteroidi Didymos e Dimorphos allo scopo di impattare sul secondo asteroide per dimostrare l’efficacia nel deviare asteroidi dalla loro potenziale traiettoria di collisione con la Terra
Konzilsrezeption in der Universitätsstadt
Creators: name: Reddeker, Florian
Publisher: name: Rottenburger Jahrbuch für Kirchengeschichte
Year: 2023

description: Rottenburger Jahrbuch für Kirchengeschichte, Bd. 38 (2019): Rottenburger Jahrbuch für Kirchengeschichte, Band 38
„Nebenkirchen“
Creators: name: Thränhardt, Dietrich
name: Winterhagen, Jenni
Publisher: name: Rottenburger Jahrbuch für Kirchengeschichte
Year: 2023

description: Rottenburger Jahrbuch für Kirchengeschichte, Bd. 38 (2019): Rottenburger Jahrbuch für Kirchengeschichte, Band 38
The analysis of psycho-social and cultural factors during pregnancy, childbirth and early motherhood. From the woman?s psychological disease to the subjective and psychological well-being
Creators: name: TASSARA, TATIANA
Publisher: name: Universit� degli studi di Genova
Year: 2019

description: Being pregnant and becoming a mother is a challenging transition for women that may be stressful as well as generating an experience of personal growth. Several studies have been undertaken primarily to understand the negative aspects and consequences of the transition to motherhood, but researchers have gradually extended the focus of their analysis to the perinatal well-being concept as a subject for more in depth investigation. However, evidence regarding the positive dimensions of women?s psychological health during the transition to motherhood is still lacking. The overall purpose of this doctoral thesis was to realize an analysis of psycho-social and cultural factors able to affect women?s psychological health during pregnancy, childbirth and motherhood, including both the perspective of psychological disease and that of well-being, with a view to understanding the relationships between positive and negative aspects of women?s perinatal psychological health, and between psychological health and psycho-social aspects. Utilizing both quantitative and qualitative methodologies, the present thesis highlighted how in the study of women?s perinatal psychological health it is important to also focus: on well-being as conceptualized within the positive psychology perspective; on the psycho-social and individual aspects which can promote a good adaptation by the woman to the transition to maternity. This work suggests for intervention programs to promote well-being for pregnant women including paths of reflection on: relations between well-being and ill-being dimensions; the quality of the couple relationship as promotion factor of well-being; the emotional complexity of pregnancy and the role of bodily changes, pursing goals and personal skills for being and feeling well; the dimensions of control in childbirth. Limits and possible future developments were discussed.
How does your data flow? Using R for ETL
Creators: name: Spencer, Michael
Publisher: name: Zenodo
Year: 2020
Subjects: data
data engineering
data science

description: Preparing your data is critical to make subsequent analysis and visualisation easier. This talk shows how R was used to support clients expecting inputs and outputs in Excel. http://edinbr.org/edinbr/2020/11/25/November-meeting.html
Hessian Operators on Constraint Manifolds
Creators: name: Birtea, Petre
name: Comănescu, Dan
Publisher: name: arXiv
Year: 2014
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics

description: On a constraint manifold we give an explicit formula for the Hessian matrix of a cost function that involves the Hessian matrix of a prolonged function and the Hessian matrices of the constraint functions. We give an explicit formula for the case of the orthogonal group ${\bf O}(n)$ by using only Euclidean coordinates on $\mathbb{R}^{n^2}$. An optimization problem on ${\bf SO}(3)$ is completely carried out. Its applications to nonlinear stability problems are also analyzed.
Understanding motor planning and action recognition of pantomimed grasps
Creators: name: QUARONA, DAVIDE
Publisher: name: Universit� degli studi di Genova
Year: 2019

description: The ability to manipulate objects with considerable skill is one of the defining features of primates. In both humans and non-human primates, grasping is typically directed toward a visible object and results in contact with the object. Humans - and perhaps some other species - are also capable of grasping imaginary objects in a pantomimed prehension. Pantomimed grasps are well studied, both for theoretical and clinical interests, to explore the double function of human hands, as instrumental as well as communicative devices. The present thesis aims to investigate both aspects of pantomimed grasps in terms of motor control, action understanding and neural activation during action observation. The first experiment explored whether the way pantomimed grasps are executed can convey weight information of imaginary objects. The second experiment tested whether observers can exploit movement kinematics to discriminate between real (i.e., movements directed toward a physically present object) and pantomimed grasps. The third study investigated if perception of real and pantomimed grasps might automatically drive object representation. The fourth experiment inspected whether having a motor expertise on pantomimed grasp execution impacts pantomimed grasp processing. The fifth experiment shed new insights on the neural underpinnings of action understanding mechanisms by exploring electroencephalography (EEG) signals during real and pantomimed grasp observation.
Equilibrium fluctuations for the disordered harmonic chain perturbed by an energy conserving noise
Creators: name: Erignoux, Clément
name: Simon, Marielle
Publisher: name: arXiv
Year: 2014
Subjects: subject: Probability (math.PR)
subject: FOS: Mathematics

description: We investigate the macroscopic behavior of the disordered harmonic chain of oscillators, through energy diffusion. The Hamiltonian dynamics of the system is perturbed by a degenerate conservative noise. After rescaling space and time diffusively, we prove that energy fluctuations in equilibrium evolve according to a linear heat equation. The diffusion coefficient is obtained from the non-gradient Varadhan's approach, and is equivalently defined through the Green-Kubo formula. Since the perturbation is very degenerate and the symmetric part of the generator does not have a spectral gap, the standard non-gradient method is reviewed under new perspectives.
From clinics to methods and back: a tale of amyloid-PET quantification
Creators: name: CHINCARINI, ANDREA
Publisher: name: Universit� degli studi di Genova
Year: 2018

description: The in-vivo assessment of cerebral amyloid load is taking a leading role in the early differential diagnosis of neurodegenerative diseases. With the hopefully near introduction of disease-modifying drugs, we expect a paradigm shift in the current diagnostic pathway with an unprecedented surge in the request of exams and detailed analysis.
Information Nonanticipative Rate Distortion Function and Its Applications
Creators: name: Stavrou, Photios A.
name: Kourtellaris, Christos K.
name: Charalambous, C. D.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Information Theory (cs.IT)
subject: Systems and Control (eess.SY)
subject: Optimization and Control (math.OC)
subject: FOS: Computer and information sciences
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Mathematics

description: This paper investigates applications of nonanticipative Rate Distortion Function (RDF) in a) zero-delay Joint Source-Channel Coding (JSCC) design based on average and excess distortion probability, b) in bounding the Optimal Performance Theoretically Attainable (OPTA) by noncausal and causal codes, and computing the Rate Loss (RL) of zero-delay and causal codes with respect to noncausal codes. These applications are described using two running examples, the Binary Symmetric Markov Source with parameter p, (BSMS(p)) and the multidimensional partially observed Gaussian-Markov source. For the multidimensional Gaussian-Markov source with square error distortion, the solution of the nonanticipative RDF is derived, its operational meaning using JSCC design via a noisy coding theorem is shown by providing the optimal encoding-decoding scheme over a vector Gaussian channel, and the RL of causal and zero-delay codes with respect to noncausal codes is computed. For the BSMS(p) with Hamming distortion, the solution of the nonanticipative RDF is derived, the RL of causal codes with respect to noncausal codes is computed, and an uncoded noisy coding theorem based on excess distortion probability is shown. The information nonanticipative RDF is shown to be equivalent to the nonanticipatory epsilon-entropy, which corresponds to the classical RDF with an additional causality or nonanticipative condition imposed on the optimal reproduction conditional distribution.
description: 34 pages, 12 figures, part of this paper was accepted for publication in IEEE International Symposium on Information Theory (ISIT), 2014 and in book Coordination Control of Distributed Systems of series Lecture Notes in Control and Information Sciences, 2015
EGI-ACE D2.10 EGI-ACE Final Recommendations
Creators: name: Andreozzi, Sergio
Publisher: name: Zenodo
Year: 2023
Subjects: Strategy
federation
data spaces
EOSC Compute Platform

description: The EGI-ACE initiative (Jan 2021 - June 2023) has delivered notable impacts in Open Science, Research, Collaboration, Infrastructure Innovation, and Skills and Expertise, through a variety of services and strategic partnerships. This work has significantly influenced areas such as interdisciplinary research, cloud integration strategies, and capacity-building initiatives. In addition, the project provided substantial feedback to the EOSC Multi-Annual Roadmap (MAR) for 2025-2027, proposing to expand EOSC's influence, enhance its Interoperability Framework, and establish a federated infrastructure including also computing and analytics capabilities among other recommendations. To further enhance the functionality of the European Open Science Cloud (EOSC), strategic recommendations were outlined, such as facilitating seamless access to computing/analytics capabilities and thematic services, improving resource composability, and harmonising funding mechanisms. Overall, the project has taken strides to make EOSC an invaluable resource for the European and international research community.
Metis osserva un colpo di frusta magnetico sul Sole
Creators: Ufficio stampa Inaf
Publisher: name: Media Inaf
Year: 2022

Catturato per la prima volta dal coronografo Metis di Solar Orbiter uno “switchback” solare, un’inversione del campo magnetico locale nell'atmosfera della nostra stella che, come sotto l’effetto di una frusta, si propaga a grandissime distanze nello spazio interplanetario. Il lavoro che descrive la scoperta, pubblicato su Astrophysical Journal Letters, è a guida Inaf
Go LiciaCube, Go!
Creators: Elisa Nichelli ed Elena Mazzotta Epifani
Publisher: name: Media Inaf
Year: 2022

Si è separato questa notte dalla sonda madre Dart (alle 01:14, ora italiana) il cubesat italiano LiciaCube, testimone oculare dell’impatto con l’asteroide Dimorphos, previsto per il 26 settembre prossimo. Nell’attesa vi presentiamo alcuni studi a guida Inaf usciti in un’edizione speciale della rivista Planetary & Space Journal
A proof of the birationality of certain BHK-mirrors
Creators: name: Clarke, Patrick
Publisher: name: arXiv
Year: 2013
Subjects: subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics

description: We generalize and give an elementary proof of Kelly's refinement of Shoemaker's result on the birationality of certain BHK-mirrors. Our approach uses a construction that is equivalent to the Krawitz generalization of the duality of Berglund-Hubsch.
description: 9 pages
Rocciosi, gassosi o liquidi: i mondi delle nane rosse
Creators: Marco Malaspina
Publisher: name: Media Inaf
Year: 2022

Dalla distribuzione per densità di 34 esopianeti di raggio inferiore a quattro volte quello della Terra osservati da Tess emergono tre gruppi ben distinti, associabili a mondi rocciosi, gassosi e – questa la novità – “liquidi”. È quanto riporta uno studio pubblicato oggi su Science da Rafael Luque dell’Instituto de Astrofísica de Andalucía ed Enric Pallé dell’Instituto de Astrofísica de Canarias
Computational analysis of the tip-gap flow of an axial ring fan
Creators: name: WAFFO KAMDEM, EMILE LEONARD
Publisher: name: Universit� degli studi di Genova
Year: 2018

description: This research is focused on the study of the aerodynamic simulation of the flow recirculating through the tip-gap of an axial ring fans normally used in cooling systems of automotive engines. The aerodynamic discomfort behaves like a mechanism that generates acoustic roughness with highly significant effects; so, right out of that generated by the impact of the wake downstream of the rotor on the stator blades, it is one of the most important sources of noise at low frequencies, able to provide tonal and broadband contributions in the spectrum of SPL. This study is developed with a three-dimensional numerical modelling of an axial fan for automotive use through the application of fluid dynamics computational methods CFD. The three-dimensional modelling includes an unstructured grid and a turbulence's modelling based on RANS (Reynolds averaged Navier-Stokes) systems; thanks the commercial code called Star-CCM+ (CD-Adapco) it is possible to solve all the Navier-Stokes equations. Particularly, this study arises in continuity with the sperimental activity done in the aeroacoustic laboratory of DIME whose it is a deepening about aerodynamic deterministic phenomena involved. In fact the geometries reflect those used in the sperimental activity. The aim of this study is deepen the knowledge about the characteristics of the recirculation flow and its interactions with the flow normally evolving in the rotor. In particular the intention is pay attention to the genesis and the following evolution of turbulent structures of large scale which can generate tonal noise when meet the rotor blades.
Katholizismus in der DDR und in den neuen Bundesländern
Creators: name: Pilvousek, Josef
Publisher: name: Rottenburger Jahrbuch für Kirchengeschichte
Year: 2023

description: Rottenburger Jahrbuch für Kirchengeschichte, Bd. 38 (2019): Rottenburger Jahrbuch für Kirchengeschichte, Band 38
Antiferromagnetic critical point on graphene's honeycomb lattice: A functional renormalization group approach
Creators: name: Janssen, Lukas
name: Herbut, Igor F.
Publisher: name: arXiv
Year: 2014
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Electrons on the half-filled honeycomb lattice are expected to undergo a direct continuous transition from the semimetallic into the antiferromagnetic insulating phase with increase of on-site Hubbard repulsion. We attempt to further quantify the critical behavior at this quantum phase transition by means of functional renormalization group (RG), within an effective Gross-Neveu-Yukawa theory for an SO(3) order parameter ("chiral Heisenberg universality class"). Our calculation yields an estimate of the critical exponents $ν\simeq 1.31$, $η_ϕ\simeq 1.01$, and $η_Ψ\simeq 0.08$, in reasonable agreement with the second-order expansion around the upper critical dimension. To test the validity of the present method we use the conventional Gross-Neveu-Yukawa theory with Z(2) order parameter ("chiral Ising universality class") as a benchmark system. We explicitly show that our functional RG approximation in the sharp-cutoff scheme becomes one-loop exact both near the upper as well as the lower critical dimension. Directly in 2+1 dimensions, our chiral-Ising results agree with the best available predictions from other methods within the single-digit percent range for $ν$ and $η_ϕ$ and the double-digit percent range for $η_Ψ$. While one would expect a similar performance of our approximation in the chiral Heisenberg universality class, discrepancies with the results of other calculations here are more significant. Discussion and summary of various approaches is presented.
description: 15 pages, 5 figures, 2 tables; v3: misprint in Eqs. (25) and (30) corrected, results unchanged
Magneti per generare ossigeno in microgravità
Creators: Guido Sbrogiò
Publisher: name: Media Inaf
Year: 2022

In uno studio pubblicato su npj Microgravity, un gruppo di ricercatori ha usato con successo la polarizzazione magnetica per separare l’ossigeno prodotto dall’elettrolisi dell’acqua in ambiente di microgravità. Questi sistemi saranno usati in futuro per le missioni a lungo termine di esplorazione spaziale dove non sarà possibile un rifornimento di acqua dalla Terra