cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Formation of martensitic microstructure in epitaxial Ni-Mn-Ga films after fast cooling
Creators: name: Ge, Yuru
name: Ganss, Fabian
name: Lünser, Klara
name: Kar, Satyakam
name: Hübner, René
name: Zhou, Shengqiang
name: Rebohle, Lars
name: Fähler, Sebastian
Publisher: name: arXiv
Year: 2024
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Shape memory alloys have a wide range of applications, including high stroke actuation, energy-efficient ferroic cooling, and energy harvesting. These applications are based on a reversible martensitic transformation, which results in a complex microstructure in the martensitic state. Understanding the formation of this microstructure after fast heating and cooling is crucial, as a high cycle frequency is essential for achieving high power density in the mentioned applications. This article uses an epitaxial Ni-Mn-Ga film as a model system to study the formation of the martensitic microstructure, since the high surface-to-volume ratio of thin films enables rapid heating and cooling, and since the formation of a multi-level hierarchical microstructure during slow cooling of this material system is already well understood. We apply a millisecond flash lamp pulse of varying energy density on the Ni-Mn-Ga film and analyse the hierarchical martensitic microstructure afterwards. Substantial differences compared to slow cooling occur, which we attribute to the limited time available for the microstructure to form and to the thermal stress between film and substrate during rapid temperature changes.
Exact expressions for $n$-point maximal $U(1)_Y$-violating integrated correlators in $SU(N)$ $\mathcal{N}=4$ SYM
Creators: name: Dorigoni, Daniele
name: Green, Michael B.
name: Wen, Congkao
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The exact expressions for integrated maximal $U(1)_Y$ violating (MUV) $n$-point correlators in $SU(N)$ ${\mathcal N}=4$ supersymmetric Yang--Mills theory are determined. The analysis generalises previous results on the integrated correlator of four superconformal primaries and is based on supersymmetric localisation. The integrated correlators are functions of $N$ and $τ=θ/(2π)+4πi/g_{_{YM}}^2$, and are expressed as two-dimensional lattice sums that are modular forms with holomorphic and anti-holomorphic weights $(w,-w)$ where $w=n-4$. The correlators satisfy Laplace-difference equations that relate the $SU(N+1)$, $SU(N)$ and $SU(N-1)$ expressions and generalise the equations previously found in the $w=0$ case. The correlators can be expressed as infinite sums of Eisenstein modular forms of weight $(w,-w)$. For any fixed value of $N$ the perturbation expansion of this correlator is found to start at order $( g_{_{YM}}^2 N)^w$. The contributions of Yang--Mills instantons of charge $k>0$ are of the form $q^k\, f(g_{_{YM}})$, where $q=e^{2πi τ}$ and $f(g_{_{YM}})= O(g_{_{YM}}^{-2w})$ when $g_{_{YM}}^2 \ll 1$. Anti-instanton contributions have charge $k<0$ and are of the form $\bar q^{|k|} \, \hat f(g_{_{YM}})$, where $\hat f(g_{_{YM}}) = O(g_{_{YM}}^{2w})$ when $g_{_{YM}}^2 \ll 1$. Properties of the large-$N$ expansion are in agreement with expectations based on the low energy expansion of flat-space type IIB superstring amplitudes. We also comment on the identification of $n$-point free-field MUV correlators with the integrands of $(n-4)$-loop perturbative contributions to the four-point correlator. In particular, we emphasise the important rôle of $SL(2, \mathbb{Z})$-covariance in the construction.
description: 40 pages. v2 minor typos corrected
Biases and Variability from Costly Bayesian Inference
Creators: name: Prat-Carrabin, Arthur
name: Meyniel, Florent
name: Tsodyks, Misha
name: da Silveira, Rava Azeredo
Publisher: name: arXiv
Year: 2021
Subjects: subject: Neurons and Cognition (q-bio.NC)
subject: FOS: Biological sciences

description: When humans infer underlying probabilities from stochastic observations, they exhibit biases and variability that cannot be explained on the basis of sound, Bayesian manipulations of probability. This is especially salient when beliefs are updated as a function of sequential observations. We introduce a theoretical framework in which biases and variability emerge from a trade-off between Bayesian inference and a cognitive cost of carrying out probabilistic computations. We consider two forms of the cost: a precision cost and an unpredictability cost; these penalize beliefs that are less entropic and less deterministic, respectively. We apply our framework to the case of a Bernoulli variable: the bias of a coin is inferred from a sequence of coin flips. Theoretical predictions are qualitatively different depending on the form of the cost. A precision cost induces overestimation of small probabilities on average and a limited memory of past observations, and, consequently, a fluctuating bias. An unpredictability cost induces underestimation of small probabilities and a fixed bias that remains appreciable even for nearly unbiased observations. The case of a fair (equiprobable) coin, however, is singular, with non-trivial and slow fluctuations of the inferred bias. The proposed framework of costly Bayesian inference illustrates the richness of a 'resource-rational' (or 'bounded-rational') picture of seemingly irrational human cognition.
description: 17 pages, 4 figures
The Truth About Binary Trading: A Red Flag You Need to Know
Creators: name: Md Shaikhul Hadis, Nazat
Publisher: name: Zenodo
Year: 2025
Subjects: Fintech
Business
Trading
Crypto

description: Abstract

Binary trading has gained popularity among novice investors through misleading social media promotions portraying it as a quick path to wealth. However, this article reveals that binary options operate as a form of financial gambling rather than legitimate trading. Unlike traditional markets, binary trading platforms often manipulate prices through unregulated over-the-counter (OTC) systems, ensuring most traders lose money.  

Regulators like the European Securities and Markets Authority (ESMA), the UK's Financial Conduct Authority (FCA), and the Australian Securities and Investments Commission (ASIC) have banned binary options due to their inherently deceptive structure. Common scams include rigged leaderboards, fake "guru" signals on Telegram, and withdrawal-blocking bonus schemes.  

The article concludes that binary trading is systematically designed to benefit brokers at the expense of traders. For sustainable investing, individuals should instead focus on regulated markets like stocks, forex, or cryptocurrencies—where proper risk management and analysis determine success. By exposing these predatory practices, this work aims to prevent financial harm to unsuspecting investors.
Measurement of the free neutron-proton elastic differential cross section at 212 and 418 MEV over the full angular range
Creators: name: Dubois, Richard
Publisher: name: University of British Columbia
Year: 2010

description: The free neutron-proton elastic differential cross section has been measured at neutron beam energies of 212 and 418 MeV. . The experiment determined the angular distribution over the range 15°-180° (CM) in two segments, having the same overall normalization. The 15°-90° range was measured by detecting scattered neutrons in a scintillator and HWPC array. Normalization was obtained by moving the array into the direct neutron beam. Energy selection was made via a time of flight (TOF) measurement relative to the TRIUMF cyclotron RF. The neutron detector was calibrated absolutely using an associated particle technique, in which the recoil proton was detected. The ratio of coincidentally observed neutron-proton pairs to protons alone yielded the efficiency, which was used to calibrate neutron beam monitors. The remainder of the angular distribution was obtained by detecting the scattered protons in a magnetic spectrometer. Proton selection was made using the TOP through the spectrometer and the momentum. Energy selection was made via the BF TOF. Normalization was provided by the same monitors as used in the measurement of the forward half of the angular distribution. The normalization of d?/dΩ has been determined to about 3%, with statistical accuracies of about 1-3% on the individual data points. These data have been included in a phase shift analysis together with all world data, showing an improvement in the energy dependence of the differential cross section near 0° CM and in the phase shifts, notably, E₃. Together with the previously measured Wolfenstein parameters, unambiguous phase shifts in the I=0 system are obtained for the first time in the TRIUMF energy range.
title: Front Matter, Table of Contents, Preface, Conference Organization
Creators: name: de'Liguoro, Ugo
name: Berardi, Stefano
name: Altenkirch, Thorsten
Publisher: name: Schloss Dagstuhl – Leibniz-Zentrum für Informatik
Year: 2021
Subjects: subject: Front Matter
subject: Table of Contents
subject: Preface
subject: Conference Organization
subject: Theory of computation → Proof theory
subject: Theory of computation → Logic and verification
subject: Software and its engineering → Formal software verification
subject: Security and privacy → Systems security
subject: Theory of computation → Type theory
subject: Theory of computation → Modal and temporal logics
subject: Theory of computation → Higher order logic
subject: Theory of computation → Equational logic and rewriting
subject: Theory of computation → Linear logic
subject: Theory of computation → Constructive mathematics
subject: Theory of computation → Complexity theory and logic

description: Front Matter, Table of Contents, Preface, Conference Organization
description: LIPIcs, Vol. 188, 26th International Conference on Types for Proofs and Programs (TYPES 2020), pages 0:i-0:viii
Quantum-mechanical description of in-medium fragmentation
Creators: name: Kopeliovich, B. Z.
name: Pirner, H. -J.
name: Potashnikova, I. K.
name: Schmidt, Ivan
name: Tarasov, A. V.
name: Voskresenskaya, O. O.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We present a quantum-mechanical description of quark-hadron fragmentation in a nuclear environment. It employs the path-integral formulation of quantum mechanics, which takes care of all phases and interferences, and which contains all relevant time scales, like production, coherence, formation, etc. The cross section includes the probability of pre-hadron (colorless dipole) production both inside and outside the medium. Moreover, it also includes inside-outside production, which is a typical quantum-mechanical interference effect (like twin-slit electron propagation). We observe a substantial suppression caused by the medium, even if the pre-hadron is produced outside the medium and no energy loss is involved. This important source of suppression is missed in the usual energy-loss scenario interpreting the effect of jet quenching observed in heavy ion collisions. This may be one of the reasons of a too large gluon density, reported by such analyzes.
description: 20 pages, 7 figures
Loop models for CFTs
Creators: name: Rajabpour, M. A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: By interpreting the fusion matrix as an adjacency matrix we associate a loop model to every primary operator of a generic conformal field theory. The weight of these loop models is given by the quantum dimension of the corresponding primary operator. Using the known results for the O(n) models we establish a relationship between these models and SLEs. The method is applied to WZW, $c<1$ minimal conformal field theories and other coset models.
description: 24 pages, 4 figures, published version, minor changes
Investigating Creation Perspectives and Icon Placement Preferences for On-Body Menus in Virtual Reality
Creators: name: Li, Xiang
name: He, Wei
name: Jin, Shan
name: Gugenheimer, Jan
name: Hui, Pan
name: Liang, Hai-Ning
name: Kristensson, Per Ola
Publisher: name: arXiv
Year: 2024
Subjects: subject: Human-Computer Interaction (cs.HC)
subject: FOS: Computer and information sciences

description: On-body menus present a novel interaction paradigm within Virtual Reality (VR) environments by embedding virtual interfaces directly onto the user's body. Unlike traditional screen-based interfaces, on-body menus enable users to interact with virtual options or icons visually attached to their physical form. In this paper, We investigated the impact of the creation process on the effectiveness of on-body menus, comparing first-person, third-person, and mirror perspectives. Our first study ($N$ = 12) revealed that the mirror perspective led to faster creation times and more accurate recall compared to the other two perspectives. To further explore user preferences, we conducted a second study ($N$ = 18) utilizing a VR system with integrated body tracking. By combining distributions of icons from both studies ($N$ = 30), we confirmed significant preferences in on-body menu placement based on icon category (e.g., Social Media icons were consistently placed on forearms). We also discovered associations between categories, such as Leisure and Social Media icons frequently co-occurring. Our findings highlight the importance of the creation process, uncover user preferences for on-body menu organization, and provide insights to guide the development of intuitive and effective on-body interactions within virtual environments.
description: 19 pages. PACM HCI: ISS (ACM ISS 2024)
Perturbative correction to the adiabatic approximation for $(d,p)$ reactions
Creators: name: Moschini, Laura
name: Timofeyuk, Natalia K.
name: Johnson, Ronald C.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The adiabatic distorted wave approximation (ADWA) is widely used by the nuclear community to analyse deuteron stripping ($d$,$p$) experiments. It provides a quick way to take into account an important property of the reaction mechanism: deuteron breakup. In this work we provide a numerical quantification of a perturbative correction to this theory, recently proposed in [R.C. Johnson, J. Phys. G: Nucl. Part. Phys. 41 (2014) 094005] for separable rank-one nucleon-proton potentials. The correction involves an additional, nonlocal, term in the effective deuteron-target ADWA potential in the entrance channel. We test the calculations with perturbative corrections against continuum-discretized coupled channel predictions which treat deuteron breakup exactly.
COVID-19 Working Paper: Food Insecurity During the First Year of the COVID-19 Pandemic in Four African Countries
Creators: name: Bloem, Jeffrey
name: Michler, Jeffrey D
name: Josephson, Anna
name: Rudin-Rush, Lorin
name: Bloem, Jeffrey
name: Michler, Jeffrey D
name: Josephson, Anna
name: Rudin-Rush, Lorin
Publisher: name: Unknown
Year: 2022
Subjects: subject: Food Security and Poverty
subject: International Development
subject: Coronavirus
subject: COVID-19 pandemic
subject: food security
subject: rural food security

description: This report analyzes food security in the year after the onset of the Coronavirus (COVID-19) pandemic in four African countries. Using household-level data collected by the World Bank, this report describes differences in food security over time during the pandemic between rural and urban areas as well as between female- and male-headed households in Burkina Faso, Ethiopia, Malawi, and Nigeria. A sharp increase in food insecurity is observed during the early months of the pandemic before a gradual decline. Additionally, findings show a larger increase in food insecurity in rural areas relative to urban areas within each of these countries. Finally, no systemic difference in food insecurity is found between female-headed and male-headed households.
Hubble tension or a transition of the Cepheid SnIa calibrator parameters?
Creators: name: Perivolaropoulos, Leandros
name: Skara, Foteini
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We re-analyze the Cepheid data used to infer the value of $H_0$ by calibrating SnIa. We do not enforce a universal value of the empirical Cepheid calibration parameters $R_W$ (Cepheid Wesenheit color-luminosity parameter) and $M_H^{W}$ (Cepheid Wesenheit H-band absolute magnitude). Instead, we allow for variation of either of these parameters for each individual galaxy. We also consider the case where these parameters have two universal values: one for low galactic distances $DD_c$ where $D_c$ is a critical transition distance. We find hints for a $3σ$ level mismatch between the low and high galactic distance parameter values. We then use AIC and BIC criteria to compare and rank the following types of models: Base models: Universal values for $R_W$ and $M_H^{W}$ (no parameter variation), I Individual fitted galactic $R_W$ with a universal fitted $M_H^{W}$, II Universal fixed $R_W$ with individual fitted galactic $M_H^{W}$, III Universal fitted $R_W$ with individual fitted galactic $M_H^{W}$, IV Two universal fitted $R_W$ (near and far) with one universal fitted $M_H^{W}$, V Universal fitted $R_W$ with two universal fitted $M_H^{W}$ (near and far), VI Two universal fitted $R_W$ with two universal fitted $M_H^{W}$ (near and far). We find that the AIC and BIC criteria consistently favor model IV instead of the commonly used Base model where no variation is allowed for the Cepheid empirical parameters. The best fit value of the SnIa absolute magnitude $M_B$ and of $H_0$ implied by the favored model IV is consistent with the inverse distance ladder calibration based on the CMB sound horizon $H_0=67.4\pm 0.5\,km\,s^{-1}\,Mpc^{-1}$. Thus in the context of the favored model IV the Hubble crisis is not present. This model may imply the presence of a fundamental physics transition taking place at a time more recent than $100\,Myrs$ ago.
description: 35 pages, 17 Figures, 7 Tables. Included comments based on discussion with SH0ES team. 2 Figures added. Included discussion on theoretical models based on false vacuum decay. The numerical analysis files and the data that lead to the production of the figures are publicly available at https://github.com/FOTEINISKARA/Cepheid_SnIa_Calibrator_Data_Transition
Exact solution of single impurity problem in non-reciprocal lattices: impurity induced size-dependent non-Hermitian skin effect
Creators: name: Liu, Yanxia
name: Zeng, Yumeng
name: Li, Linhu
name: Chen, Shu
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Non-Hermitian non-reciprocal systems are known to be extremely sensitive to boundary conditions, exhibiting diverse localizing behaviors and spectrum structures when translational invariance is locally broken, either by tuning the boundary coupling strength, or by introducing an effective boundary using impurities or defects. In this work, we consider the single impurity problem in the Hatano-Nelson model and the Su-Schreieffer-Heeger model, which can be exactly solved with the single impurity being treated as an effective boundary of the system. From our exact solutions for finite-size systems, we unveil that increasing the impurity strength can lead to a transition of the bulk states from non-skin states to skin states, accompanied by the change of the spectrum structure from an ellipse in the complex plane to a segment along the real axis. These exact results indicate that the critical value of impurity strength is size-dependent, and increases exponentially with the lattice size when the impurity is strong or the system is large enough. OUr exact solutions are also useful for determining the point-gap topological transition in the concerned models.
description: 9 pages and 8 figures in total. Comments are welcome
title: Front Matter, Table of Contents, Preface, Conference Organization
Creators: name: Buchin, Kevin
name: Colin de Verdière, Éric
Publisher: name: Schloss Dagstuhl – Leibniz-Zentrum für Informatik
Year: 2021
Subjects: subject: Front Matter
subject: Table of Contents
subject: Preface
subject: Conference Organization
subject: Theory of computation → Computational geometry
subject: Theory of computation → Design and analysis of algorithms
subject: Mathematics of computing → Combinatorics
subject: Mathematics of computing → Graph algorithms

description: Front Matter, Table of Contents, Preface, Conference Organization
description: LIPIcs, Vol. 189, 37th International Symposium on Computational Geometry (SoCG 2021), pages 0:i-0:xviii
Inferring Preferences from Demonstrations in Multi-objective Reinforcement Learning
Creators: name: Lu, Junlin
name: Mannion, Patrick
name: Mason, Karl
Publisher: name: arXiv
Year: 2024
Subjects: subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: Many decision-making problems feature multiple objectives where it is not always possible to know the preferences of a human or agent decision-maker for different objectives. However, demonstrated behaviors from the decision-maker are often available. This research proposes a dynamic weight-based preference inference (DWPI) algorithm that can infer the preferences of agents acting in multi-objective decision-making problems from demonstrations. The proposed algorithm is evaluated on three multi-objective Markov decision processes: Deep Sea Treasure, Traffic, and Item Gathering, and is compared to two existing preference inference algorithms. Empirical results demonstrate significant improvements compared to the baseline algorithms, in terms of both time efficiency and inference accuracy. The DWPI algorithm maintains its performance when inferring preferences for sub-optimal demonstrations. Moreover, the DWPI algorithm does not necessitate any interactions with the user during inference - only demonstrations are required. We provide a correctness proof and complexity analysis of the algorithm and statistically evaluate the performance under different representation of demonstrations.
description: Neural Comput & Applic (2024)
Blockchain Security by Design Framework for Trust and Adoption in IoT Environment
Creators: name: Sargsyan, Gohar
name: Castellon, Nicolas
name: Binnendijk, Raymond
name: Cozijnsen, Peter
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cryptography and Security (cs.CR)
subject: FOS: Computer and information sciences

description: With the recent advances of IoT (Internet of Things) new and more robust security frameworks are needed to detect and mitigate new forms of cyber-attacks, which exploit complex and heterogeneity IoT networks, as well as, the existence of many vulnerabilities in IoT devices. With the rise of blockchain technologies service providers pay considerable attention to better understand and adopt blockchain technologies in order to have better secure and trusted systems for own organisations and their customers. The present paper introduces a high level guide for the senior officials and decision makers in the organisations and technology managers for blockchain security framework by design principle for trust and adoption in IoT environments. The paper discusses Cyber-Trust project blockchain technology development as a representative case study for offered security framework. Security and privacy by design approach is introduced as an important consideration in setting up the framework.
description: This paper is a preprint; it has been accepted for publication in 2019 IEEE World Congress on Services(SERVICES), 8-13 July 2019, Milan, Italy. The paper consists of 6 pages, and contains of 1 figure and 2 tables
attesa nella neuropsicologia: uno sguardo ai processi cognitivi sottostanti nell’era delle nuove tecnologie
Creators: name: Leonardi, Gloria
Publisher: name: DNA – Di Nulla Academia
Year: 2021

description: La letteratura scientifica ha messo in evidenza le grandi capacità adattive del cervello. Il nostro sistema cerebrale può infatti rimodellare le sinapsi e la propria conformazione, in maniera plastica, in base ai diversi stimoli ambientali. In particolare, alcune ricerche hanno investigato i cambiamenti nello sviluppo di alcune abilità cognitive legate all’attesa, quali i processi attentivi ed i meccanismi del controllo della ricompensa. I risultati hanno permesso di evidenziare alcuni cambiamenti nell’efficienza di tali abilità associati ad un maggiore utilizzo di dispositivi tecnologici come lo smartphone. I risultati vanno però analizzati alla luce di alcuni limiti strutturali di questi studi come la mancanza di tempi necessari ad un’osservazione prospettica ed i metodi di analisi utilizzati.
description: DNA – Di Nulla Academia, Vol. 2 No. 1 (2021): The direction of the wait
Computer-mediated therapies for stroke rehabilitation: a systematic review and meta-Analysis
Creators: name: Zoppi, Stanley Mugisha. Mirko Job. Matteo
name: Testa, Marco
name: Molfino, Rezia
Publisher: name: arXiv
Year: 2024
Subjects: subject: Medical Physics (physics.med-ph)
subject: Artificial Intelligence (cs.AI)
subject: Human-Computer Interaction (cs.HC)
subject: Multimedia (cs.MM)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences
subject: J.3.2

description: OBJECTIVE: To evaluate the efficacy of different forms of virtual reality (VR) treatments as either immersive virtual reality (IVR) or non-immersive virtual reality (NIVR) in comparison to conventional therapy (CT) in improving physical and psychological status among stroke patients. METHODS: The literature search was conducted on seven databases. ACM Digital Library, Medline (via PubMed), Cochrane, IEEE Xplore, Web of Science, and Scopus. The effect sizes of the main outcomes were calculated using Cohen's d. Pooled results were used to present an overall estimate of the treatment effect using a random-effects model. RESULTS: A total of 22 randomized controlled trials were evaluated. 3 trials demonstrated that immersive virtual reality improved upper limb activity, function and activity of daily life in a way comparable to CT. 18 trials showed that NIVR had similar benefits to CT for upper limb activity and function, balance and mobility, activities of daily living and participation. A comparison between the different forms of VR showed that IVR may be more beneficial than NIVR for upper limb training and activities of daily life. CONCLUSIONS: This study found out that IVR therapies may be more effective than NIVR but not CT to improve upper limb activity, function, and daily life activities. However, there is no evidence of the durability of IVR treatment. More research involving studies with larger samples is needed to assess the long-term effects and promising benefits of immersive virtual reality technology.
description: 32 pages
Orologi umani
Creators: name: Tirendi, Carla
Publisher: name: DNA – Di Nulla Academia
Year: 2021

description: Nell’attesa cosa si aspetta concretamente? La retorica dello spreco rivela una prospettiva da cui è possibile contemplare il concetto del tempo quando esso si trasforma in attesa attraverso la rilettura d’alcuni stralci di testi della narrativa breve del secondo Novecento a opera di autori come Ercole Patti e Vitaliano Brancati. Grazie ai personaggi più noti dei loro romanzi è scorgibile una visione del mondo che riflette i disagi sociali dovuti a uno status introspettivo di stallo, condizione globale in questo tempo affannato dall’emergenza pandemica. In una cornice che intende indagare sulla contemporaneità ritorna vigente l’autentica lezione erotica di questi scrittori.
description: DNA – Di Nulla Academia, Vol. 2 No. 1 (2021): The direction of the wait
Negare l’antonomasia: Giacomo Casanova e l’attesa di un riconoscimento tardivo
Creators: name: Grazioli, Elena
Publisher: name: DNA – Di Nulla Academia
Year: 2021

description: Giacomo Casanova trascorre l’ultima parte della sua esistenza a Dux, in Boemia, bibliotecario del conte di Waldstein. Qui, inizia la stesura delle sue memorie che lo condurranno, a differenze delle opere precedenti, a entrare nel canone degli autori settecenteschi. Si tratta, tuttavia, di un riconoscimento decisamente tardivo, giunto soltanto con la pubblicazione dell’Histoire de ma vie all’interno di prestigiose collane quali «I Meridiani» e «La Bibliothèque de la Pléiade». Verranno ripercorse alcune delle tappe fondamentali che conducono a questo successo postumo e si tenterà di meglio inquadrare gli ultimi anni dell’esistenza del cavaliere di Seingalt.
description: DNA – Di Nulla Academia, Vol. 2 No. 1 (2021): The direction of the wait
Correlation, hierarchies, and networks in financial markets
Creators: name: Tumminello, M.
name: Lillo, F.
name: Mantegna, R. N.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistical Finance (q-fin.ST)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: Physics and Society (physics.soc-ph)
subject: Portfolio Management (q-fin.PM)
subject: FOS: Economics and business
subject: FOS: Physical sciences

description: We discuss some methods to quantitatively investigate the properties of correlation matrices. Correlation matrices play an important role in portfolio optimization and in several other quantitative descriptions of asset price dynamics in financial markets. Specifically, we discuss how to define and obtain hierarchical trees, correlation based trees and networks from a correlation matrix. The hierarchical clustering and other procedures performed on the correlation matrix to detect statistically reliable aspects of the correlation matrix are seen as filtering procedures of the correlation matrix. We also discuss a method to associate a hierarchically nested factor model to a hierarchical tree obtained from a correlation matrix. The information retained in filtering procedures and its stability with respect to statistical fluctuations is quantified by using the Kullback-Leibler distance.
description: 37 pages, 9 figures, 3 tables
Closure relations for composite bosons: difference between polaritons and Wannier or Frenkel excitons
Creators: name: Combescot, M.
name: Dupertuis, M. A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We derive the closure relation for $N$ polaritons made of three different types of excitons: bosonized excitons, Frenkel or Wannier excitons. In the case of polaritons made of Wannier excitons, we show how this closure relation, which appears as non-diagonal, may reduce to the one of $N$ elementary bosons, the photons, with its $1/N!$ prefactor, or to the one of $N$ Wannier excitons, with its $(1/N!)^2$ prefactor. Widely different forms of closure relations are thus found depending on the composite bosons at hand. Comparison with closure relations of excitons, either bosonized or kept composite as Frenkel or Wannier excitons, allows us to discuss the influence of a reduction of the number of internal degrees of freedom, as well as the importance of the composite nature of the particles and the existence of fermionic components.
Health Care Access Among Self-Employed Workers in Nonmetropolitan Counties
Creators: name: Dobis, Elizabeth A
name: Todd, Jessica E
name: Dobis, Elizabeth A
name: Todd, Jessica E
Publisher: name: Unknown
Year: 2022
Subjects: subject: Health Economics and Policy
subject: Health care access
subject: health insurance
subject: health care costs
subject: self-employed

description: Access to health care involves affordability, which is often tied to health insurance coverage, as well as availability of health care facilities and providers. Self-employed workers are less likely to have access to employer-sponsored health insurance plans, and rural areas may have fewer options for local health care. Through the lens of availability and affordability, this report studies health care access for self-employed individuals, their families, and their households in nonmetropolitan counties, using data collected between 2014 and 2020. The results indicate that health insurance coverage rates and sources differ more by age and whether workers are self-employed than by whether they live in a metro or nonmetro location.
«Il lasciar l’auditor sospeso». La regia dell’attesa nella Liberata
Creators: name: Di Franco, Alberto
Publisher: name: DNA – Di Nulla Academia
Year: 2021

description: Quando il finale di un’opera letteraria è scritto nell’incipit, cosa tiene il lettore col fiato sospeso fino alla sua conclusione? Il saggio, tramite l’analisi delle tecniche narrative e retoriche adottate dal poeta-regista della Liberata, si propone di offrire una possibile risposta, riservando una particolare attenzione allo studio delle dinamiche dell’intreccio tassiano, inteso come dispositivo interazionale, che risponde al bisogno di suscitare un desiderio cognitivo.
description: DNA – Di Nulla Academia, Vol. 2 No. 1 (2021): The direction of the wait
Generalized Grad-Shafranov equation for gravitational Hall-MHD equilibria
Creators: name: Cremaschini, C.
name: Beklemishev, A.
name: Miller, J.
name: Tessarotto, M.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The consistent theoretical description of gravitational Hall-MHD (G-Hall-MHD) equilibria is of fundamental importance for understanding the phenomenology of accretion disks (AD) around compact objects (black holes, neutron stars, etc.). The very existence of these equilibria is actually suggested by observations, which show evidence of quiescent, and essentially non-relativistic, AD plasmas close to compact stars, thus indicating that accretion disks may be characterized by slowly varying EM and fluid fields. These (EM) fields, in particular the electric field, may locally be extremely intense, so that AD plasmas are likely to be locally non-neutral and therefore characterized by the presence of Hall currents. This suggests therefore that such equilibria should be described in the framework of the Hall-MHD theory. Extending previous approaches, holding for non-rotating plasmas or based on specialized single-species model equilibria which ignore the effect of space-time curvature, the purpose of this work is the formulation of a generalized Grad-Shafranov (GGS) equation suitable for the investigation of G-Hall-MHD equilibria in AD's where non-relativistic plasmas are present. For this purpose the equilibria are assumed to be generated by a strong axisymmetric stellar magnetic field and by the gravitating plasma characterizing the AD.
Breaking the Single Clock Symmetry: measuring single-field inflation non-Gaussian features
Creators: name: Bertacca, Daniele
name: Jimenez, Raul
name: Matarrese, Sabino
name: Verde, Licia
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The Universe is not just cold dark matter and dark energy, it also contains baryons, radiation and neutrinos. The presence of these components, beyond the pressure-less cold dark matter and the quasi-uniform dark energy ones, imply that the single clock assumption from inflation is no longer preserved. Here we quantify this effect and show that the single-clock symmetry is ensured only on scales where baryonic effects, neutrinos effects, or sound speed are zero. These scales depend on the cosmic epoch and the Universe composition. Hence for all use and purposes of interpreting state-of-the-art and possibly forthcoming surveys, in the accessible scales, single clock symmetry cannot be said to be satisfied. Breaking the single-clock symmetry has key consequences for the study of non-Gaussian features generated by pure single-field inflation which arise from non-linearities in the metric yielding non-Gaussianities of the local type: the $n_{s}-1$ and the relativistic $-5/3$ term.
Impact of Estimation Errors of a Matrix of Transfer Functions onto Its Analytic Singular Values and Their Potential Algorithmic Extraction
Creators: name: Bakhit, Mohammed
name: Khattak, Faizan A.
name: Proudler, Ian K.
name: Weiss, Stephan
Publisher: name: arXiv
Year: 2024
Subjects: subject: Signal Processing (eess.SP)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: A matrix of analytic functions A(z), such as the matrix of transfer functions in a multiple-input multiple-output (MIMO) system, generally admits an analytic singular value decomposition (SVD), where the singular values themselves are functions. When evaluated on the unit circle, for the sake of analyticity, these singular values must be permitted of become negative. In this paper, we address how the estimation of such a matrix, causing a stochastic perturbation of A}(z), results in fundamental changes to the analytic singular values: for the perturbed system, we show that their analytic singular values lose any algebraic multiplicities and are strictly non-negative with probability one. We present examples and highlight the impact that this has on algorithmic solutions to extracting an analytic or approximate analytic SVD.
Axion-Like Particle Searches with IACTs
Creators: name: Batković, Ivana
name: De Angelis, Alessandro
name: Doro, Michele
name: Manganaro, Marina
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: The growing interest in axion-like particles (ALPs) stems from the fact that they provide successful theoretical explanations of physics phenomena, from the anomaly of the CP-symmetry conservation in strong interactions to the observation of an unexpectedly large TeV photon flux from astrophysical sources, at distances where the strong absorption by the intergalactic medium should make the signal very dim. In this latter condition, which is the focus of this review, a possible explanation is that TeV photons convert to ALPs in the presence of strong and/or extended magnetic fields, such as those in the core of galaxy clusters or around compact objects, or even those in the intergalactic space. This mixing affects the observed $γ$-ray spectrum of distant sources, either by signal recovery or the production of irregularities in the spectrum, called "wiggles", according to the specific microscopic realization of the ALP and the ambient magnetic field at the source, and in the Milky Way, where ALPs may be converted back to $γ$ rays. ALPs are also proposed as candidate particles for the Dark Matter. Imaging Atmospheric Cherenkov telescopes (IACTs) have the potential to detect the imprint of ALPs in the TeV spectrum from several classes of sources. In this contribution, we present the ALP case and review the past decade of searches for ALPs with this class of instruments.
description: 21 pages, 8 figures, published in MDPI - Universe Special Issue "High-Energy Gamma-Ray Astronomy: Results on Fundamental Questions after 30 Years of Ground-Based Observations", 5 June 2021
Topics in black hole evaporation
Creators: name: Leahy, Denis Alan
Publisher: name: University of British Columbia
Year: 2010

description: Two major aspects of particle creation by gravitational fields of black holes are studied; the neutrino emission from rotating black holes; and interactions between scalar particles emitted by a black hole. The neutrino emission is investigated under three topics. The asymmetry of the angular dependence of neutrino emission from rotating black holes is calculated first. A low frequency analytic approximation demonstrates the preferential emission of neutrinos (antineutrinos) antiparallel (parallel) to the direction of the black hole's angular momentum vector. Numerical calculations are performed which reveal the dependence of the neutrino emission on polar angle, neutrino energy, and black hole angular momentum and mass. Next we consider the production of a local matter excess by rotating black holes in a baryon symmetric universe. Black holes form at early cosmological times with their rotation axes aligned over the same scale size as the angular momentum in the universe. The evaporation of these black holes produces large scale neutrino currents, whose effectiveness in separating baryons from antibaryons during the hadron era of the early universe is estimated. The local baryon to photon ratio over a galactic size scale depends on the subsequent evolution of the resulting matter and antimatter regions, but is found to have an upper limit of 10 ⁻¹⁴. This is much less than the present observed value of about 10⁻⁹. We then study cosaological magnetic field generation by neutrinos from evaporating black holes. During the radiation era the neutrinos scatter off protons and alectrons, producing a net charge current. This current generates magnetic fields. If present in large enough numbers, rotating black holes could account for the present observed magnetic field in our galaxy. Finally we study the effects of interactions on the black hole evaporation process. Perturbation theory is used, to second order, to calculate the effects of a 2Ф⁴ self-interaction for a scalar field Ф in the 2 dimensional black hole spacetime. a mass renormalization was found to be insufficient to remove all divergences that occur in the calculations. However, the interaction appears to destroy the thermal character of the emission from a black hole evaporating in a vacuum.
Explicit R-Symmetry Breaking and Metastable Vacua
Creators: name: Marques, D.
name: Schaposnik, F. A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We consider O'Raifeartaigh-like models with explicit R-symmetry breaking and analyze the vacuum landscape. Taking such models as candidates for the hidden sector, we analyze the gauge mediation of the supersymmetry breaking, focusing on the effects produced by R-symmetry breaking. First, we construct families of non-R-symmetric models containing only singlet chiral superfields, and determine the conditions under which SUSY vacua, runaway directions and (longlived) metastable vacua exist. We then extend the results to the case in which some of the chiral fields are in a non-trivial representation of SU(5). Gauging this symmetry, we compute soft masses for gauginos and sfermions, and analyze several issues such as doublet/triplet splitting, unification of coupling constants and CP violation phases.
description: 35 pages, 5 figures, minor clarifications, references added, JHEP version
The Vision and the Perspective of Digital Tourism
Creators: name: Kononova, Olga
name: Prokudin, Dmitry
name: Ryabysko, Julia
Publisher: name: arXiv
Year: 2021
Subjects: subject: Digital Libraries (cs.DL)
subject: Information Retrieval (cs.IR)
subject: FOS: Computer and information sciences

description: The dynamics of the modern information society changes the usual areas of human activity, generates various innovations based on the widespread use of Information and Communication Technologies (ICTs). Virtually, every activity today is technology related. In these conditions, scientific activity is also changing. Digitalization processes act as integrative to various scientific directions, which form the base for interdisciplinary scientific research. The study of their formation is an important scientific task aimed at predicting the development of both science and society as a whole. In this study, based on the integrated use of ICTs, we consider methods of the terminology base analysis in various interdisciplinary research directions on the instance of tourism in the digital age. The development of scientific interest in the area of digital tourism in Russian and global scientific discourses is also compared. The purpose of this paper is to proof the relevance of scientific study in the field of tourism digitalization, to identify the generic directions and trends of digital tourism, and to specify technologies for the implementation of digital tourism using the case study of St. Petersburg.
description: 22nd Conference on Scientific Services & Internet (SSI-2020), Novorossiysk-Abrau (online), Russia, September 21-25, 2020
On the validity of the LAD and LL classical radiation-reaction equations
Creators: name: Dorigo, M.
name: Tessarotto, M.
name: Nicolini, P.
name: Beklemishev, A.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Classical Physics (physics.class-ph)
subject: General Physics (physics.gen-ph)
subject: FOS: Physical sciences

description: The search of the correct equation of motion for a classical charged particle under the action of its electromagnetic (EM) self-field, the so-called \textit{radiation-reaction equation of motion}, remains elusive to date. In this paper we intend to point out why this is so. The discussion is based on the direct construction of the EM self-potentials produced by a charged spherical particle under the action of an external EM force. In particular we intend to analyze basic features of the LAD (Lorentz-Abraham-Dirac) and the LL (Landau-Lifschitz) equations. Both are shown to lead to incorrect or incomplete results.
description: Contributed paper at RGD26 (Kyoto,Japan, July 2008)
attesa del redentore: il capitolo conclusivo del Principe
Creators: name: Varotti, Carlo
Publisher: name: DNA – Di Nulla Academia
Year: 2021

description: Il saggio sottolinea il significato politico che il principio della attesa assume nel contesto della profezia, che è la tonalità che segna (con un’altissima riuscita retorica) la pagina finale del Principe. Un testo che richiama esplicitamente il modello dell’Esodo e, implicitamente, la figura di Mosè; e che si pone al centro di un fascio molteplici di suggestioni, di cui è possibile seguire le tracce lungo l’intero arco della scrittura machiavelliana, dalle prime testimonianze ai trattati maggiori. Spunti e suggestioni in cui è presenza ineliminabile Savonarola, e la sua avventura sfortunata che ha trasformato la parola in profezia, cioè in progetto politico e costruzione di una nuova realtà. Un dialogo a distanza, quello tra Machiavelli e il frate domenicano, che mentre sembra parlare di questioni pratiche operative (l’azione vincente del profeta ‘armato’ e quella fallimentare del profeta ‘disarmato’) propone in realtà una riflessione fondamentale sul senso dell’agire politico, e sul rapporto drammatico tra progetto e realizzazione, tra utopia e realismo.
description: DNA – Di Nulla Academia, Vol. 2 No. 1 (2021): The direction of the wait
A trajectory-driven algorithm for differentiating SRB measures on unstable manifolds
Creators: name: Sliwiak, Adam A.
name: Wang, Qiqi
Publisher: name: arXiv
Year: 2021
Subjects: subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics
subject: 65P20, 65C05, 37A05, 28A25

description: SRB measures are limiting stationary distributions describing the statistical behavior of chaotic dynamical systems. Directional derivatives of SRB measure densities conditioned on unstable manifolds are critical in the sensitivity analysis of hyperbolic chaos. These derivatives, known as the SRB density gradients, are by-products of the regularization of Lebesgue integrals appearing in the original linear response expression. In this paper, we propose a novel trajectory-driven algorithm for computing the SRB density gradient defined for systems with high-dimensional unstable manifolds. We apply the concept of measure preservation together with the chain rule on smooth manifolds. Due to the recursive one-step nature of our derivations, the proposed procedure is memory-efficient and can be naturally integrated with existing Monte Carlo schemes widely used in computational chaotic dynamics. We numerically show the exponential convergence of our scheme, analyze the computational cost, and present its use in the context of Monte Carlo integration.
description: 25 pages, 9 figures, submitted to journal, under review