cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Control of superconductivity with a single ferromagnetic layer in niobium/erbium bilayers
Creators: name: Satchell, N.
name: Witt, J. D. S.
name: Flokstra, M. G.
name: Lee, S. L.
name: Cooper, J. F. K.
name: Kinane, C. J.
name: Langridge, S.
name: Burnell, G.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Superconducting spintronics in hybrid superconductor/ferromagnet (S-F) heterostructures provides an exciting potential new class of device. The prototypical super-spintronic device is the superconducting spin-valve, where the critical temperature, $T_c$, of the S-layer can be controlled by the relative orientation of two (or more) F-layers. Here, we show that such control is also possible in a simple S/F bilayer. Using field history to set the remanent magnetic state of a thin Er layer, we demonstrate for a Nb/Er bilayer a high level of control of both $T_c$ and the shape of the resistive transition, R(T), to zero resistance. We are able to model the origin of the remanent magnetization, treating it as an increase in the effective exchange field of the ferromagnet and link this, using conventional S-F theory, to the suppression of $T_c$. We observe stepped features in the R(T) which we argue is due to a fundamental interaction of superconductivity with inhomogeneous ferromagnetism, a phenomena currently lacking theoretical description.
description: 19 pages, 4 figures
Sensitivities to feebly interacting particles: public and unified calculations
Creators: name: Ovchynnikov, Maksym
name: Tastet, Jean-Loup
name: Mikulenko, Oleksii
name: Bondarenko, Kyrylo
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The increasing interest in Long-Lived Particles (LLPs) has led to numerous proposed experiments in order to search for them. However, the sensitivity estimates published by these experiments tend to rely on disparate assumptions. To ensure an accurate comparison of their potential to find LLPs, a unified estimation of their sensitivity is therefore required. In this contribution, we introduce \texttt{SensCalc}, a \texttt{Mathematica}-based code that uses a semi-analytic approach to calculate the event rate of GeV-scale LLPs, and we present several case studies.
description: EPS-HEP 2023 proceedings
Hybrid loop quantum cosmology and predictions for the cosmic microwave background
Creators: name: Gomar, Laura Castelló
name: de Blas, Daniel Martín
name: Marugán, Guillermo A. Mena
name: Olmedo, Javier
Publisher: name: arXiv
Year: 2017
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We investigate the consequences of the hybrid quantization approach for primordial perturbations in loop quantum cosmology, obtaining predictions for the cosmic microwave background and comparing them with data collected by the Planck mission. In this work, we complete previous studies about the scalar perturbations and incorporate tensor modes. We compute their power spectrum for a variety of vacuum states. We then analyze the tensor-to-scalar ratio and the consistency relation between this quantity and the spectral index of the tensor power spectrum. We also compute the temperature-temperature, electric-electric, temperature-electric, and magnetic-magnetic correlation functions. Finally, we discuss the effects of the quantum geometry in these correlation functions and confront them with observations.
description: 34 pages, 23 figures, 1 table; v2: revised and minor improvements included
Acacia, Climop, GreAT, Alternate - FIRST RESULTS OF EU-FUNDED AERONAUTIC PROJECTS
Creators: name: Finke, Michael
name: Matthes, Sigrun
name: Tedeschi, Alessandra
name: Alonso, Gustavo
name: Stasicka, Izabela
name: Baumann, Sabine
Publisher: name: Zenodo
Year: 2022
Subjects: GreAT
green aviation
H2020 Transport
climate change
CINEA
air traffic operations
Climop
Acacia
Alternate

description: Poster at the 5th International Conference on Transport, Atmosphere and Climate (TAC-5) 2022, Bad Aibling, Germany, 27-30/6/22, https://tac2022.welcome-manager.de/
The impact of selection biases on tests of general relativity with gravitational-wave inspirals
Creators: name: Magee, Ryan
name: Isi, Maximiliano
name: Payne, Ethan
name: Chatziioannou, Katerina
name: Farr, Will M.
name: Pratten, Geraint
name: Vitale, Salvatore
Publisher: name: arXiv
Year: 2023
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: Tests of general relativity with gravitational wave observations from merging compact binaries continue to confirm Einstein's theory of gravity with increasing precision. However, these tests have so far only been applied to signals that were first confidently detected by matched-filter searches assuming general relativity templates. This raises the question of selection biases: what is the largest deviation from general relativity that current searches can detect, and are current constraints on such deviations necessarily narrow because they are based on signals that were detected by templated searches in the first place? In this paper, we estimate the impact of selection effects for tests of the inspiral phase evolution of compact binary signals with a simplified version of the GstLAL search pipeline. We find that selection biases affect the search for very large values of the deviation parameters, much larger than the constraints implied by the detected signals. Therefore, combined population constraints from confidently detected events are mostly unaffected by selection biases, with the largest effect being a broadening at the $\sim10$ % level for the $-1$PN term. These findings suggest that current population constraints on the inspiral phase are robust without factoring in selection biases. Our study does not rule out a disjoint, undetectable binary population with large deviations from general relativity, or stronger selection effects in other tests or search procedures.
Generating 3 qubit quantum circuits with neural networks
Creators: name: Swaddle, Michael
name: Noakes, Lyle
name: Salter, Liam
name: Smallbone, Harry
name: Wang, Jingbo
Publisher: name: arXiv
Year: 2017
Subjects: subject: Quantum Physics (quant-ph)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: A new method for compiling quantum algorithms is proposed and tested for a three qubit system. The proposed method is to decompose a a unitary matrix U, into a product of simpler U j via a neural network. These U j can then be decomposed into product of known quantum gates. Key to the effectiveness of this approach is the restriction of the set of training data generated to paths which approximate minimal normal subRiemannian geodesics, as this removes unnecessary redundancy and ensures the products are unique. The two neural networks are shown to work effectively, each individually returning low loss values on validation data after relatively short training periods. The two networks are able to return coefficients that are sufficiently close to the true coefficient values to validate this method as an approach for generating quantum circuits. There is scope for more work in scaling this approach to larger quantum systems.
description: 5 pages, 5 figures
A First Look At NAT64 Deployment In-The-Wild
Creators: name: Hsu, Amanda
name: Li, Frank
name: Pearce, Paul
name: Gasser, Oliver
Publisher: name: arXiv
Year: 2023
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: FOS: Computer and information sciences

description: IPv6 is a fundamentally different Internet Protocol than IPv4, and IPv6-only networks cannot, by default, communicate with the IPv4 Internet. This lack of interoperability necessitates complex mechanisms for incremental deployment and bridging networks so that non-dual-stack systems can interact with the whole Internet. NAT64 is one such bridging mechanism by which a network allows IPv6-only clients to connect to the entire Internet, leveraging DNS to identify IPv4-only networks, inject IPv6 response addresses pointing to an internal gateway, and seamlessly translate connections. To date, our understanding of NAT64 deployments is limited; what little information exists is largely qualitative, taken from mailing lists and informal discussions.
 In this work, we present a first look at the active measurement of NAT64 deployment on the Internet focused on deployment prevalence, configuration, and security. We seek to measure NAT64 via two distinct large-scale measurements: 1) open resolvers on the Internet, and 2) client measurements from RIPE Atlas. For both datasets, we broadly find that despite substantial anecdotal reports of NAT64 deployment, measurable deployments are exceedingly sparse. While our measurements do not preclude the large-scale deployment of NAT64, they do point to substantial challenges in measuring deployments with our existing best-known methods. Finally, we also identify problems in NAT64 deployments, with gateways not following the RFC specification and also posing potential security risks.
Opomíjené obilniny se hlásí o slovo (Neglected cereals make a statement)
Creators: name: Hesová, Anežka
Publisher: name: Zenodo
Year: 2023
Subjects: buckwheat - Fagopyrum
oat - Avena sativa
spelt - Triticum spelta
phosphorus
organic agriculture

description: Overview about the Crop Research Institute's (CRI), Prague, involvement and work in the European projects "HealthyMinorCereals" (FP7) and "ECOBREED" (H2020) and interview with Dagmar Janovská, head of the genebank of CRI.
Vortex-induced vibration of a flexible pipe under oscillatory sheared flow
Creators: name: Fu, Xuepeng
name: Fu, Shixiao
name: Zhang, Mengmeng
name: Ren, Haojie
name: Zhao, Bing
name: Xu, Yuwang
Publisher: name: arXiv
Year: 2023
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: Vortex-induced vibration (VIV) test of a tensioned flexible pipe in oscillatory sheared flow was performed in an ocean basin. The model was 28.41 mm in diameter and 3.88 m in length. The test was performed on a rotating test rig to simulate oscillatory sheared flow conditions. One end of the test pipe is fixed, and one end is forced to harmonically oscillate to simulate oscillatory sheared flows with various combinations of amplitudes and periods, Keulegan-Carpenter ($KC$) numbers from $25$ to $160$ and five kinds of reduced velocities $Vr$ from $6$ to $14$. Fiber Bragg Grating (FBG) strain sensors were arranged along the test pipe to measure bending strains, and the modal analysis approach was used to determine the VIV response. The VIV response in the cross flow (CF) direction is investigated. The results show that VIV under oscillatory sheared flow exhibit amplitude modulation and hysteresis phenomena. Compared with oscillatory uniform flow-induced VIV, the Strouhal number is smaller in oscillatory sheared flow-induced VIVs. The VIV developing process in oscillatory sheared flow is analyzed, and critical $KC$ is proposed to describe the occurrence of modulated VIV under oscillatory sheared flow.
description: 19 pages, 18 figures
An Integrated Transportation Distance Between Kernels and Approximate Dynamic Risk Evaluation in Markov Systems
Creators: name: Lin, Zhengqi
name: Ruszczynski, Andrzej
Publisher: name: arXiv
Year: 2023
Subjects: subject: Optimization and Control (math.OC)
subject: FOS: Mathematics

description: We introduce a distance between kernels based on the Wasserstein distances between their values, study its properties, and prove that it is a metric on an appropriately defined space of kernels. We also relate it to various modes of convergence in the space of kernels. Then we consider the problem of approximating solutions to forward--backward systems, where the forward part is a Markov system described by a sequence of kernels, and the backward part calculates the values of a risk measure by operators that may be nonlinear with respect to the system's kernels. We propose to recursively approximate the forward system with the use of the integrated transportation distance between kernels and we estimate the error of the risk evaluation by the errors of individual kernel approximations. We illustrate the results on stopping problems and several well-known risk measures. Then we develop a particle-based numerical procedure, in which the approximate kernels have finite support sets. Finally, we illustrate the efficacy of the approach on the financial problem of pricing an American basket option.
Polyakov Loop in Non-covariant Operator Formalism
Creators: name: Sakamoto, Makoto
name: Takenaga, Kazunori
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We discuss a Polyakov loop in non-covariant operator formalism which consists of only physical degrees of freedom at finite temperature. It is pointed out that although the Polyakov loop is expressed by a Euclidean time component of gauge fields in a covariant path integral formalism, there is no direct counterpart of the Polyakov loop operator in the operator formalism because the Euclidean time component of gauge fields is not a physical degree of freedom. We show that by starting with an operator which is constructed in terms of only physical operators in the non-covariant operator formalism, the vacuum expectation value of the operator calculated by trace formula can be rewritten into a familiar form of an expectation value of Polyakov loop in a covariant path integral formalism at finite temperature for the cases of axial and Coulomb gauge.
description: 31 pages, version to appear in Prog.Theor.Exp.Phys, report number corrected
Operational Assessment by an airspace user
Creators: name: Clim Van Der Weijden
name: Velde, Tim Ten
Publisher: name: Zenodo
Year: 2022
Subjects: GreAT
green aviation
H2020 Transport
climate change
CINEA
air traffic operations

description: Presentation at the 12th EASN International Conference on "Innovation in Aviation & Space for opening New Horizons", Barcelona, Spain, 18-21/10/22, http://easnconference.eu/
Coupled high-finesse optical Fabry-Perot microcavities
Creators: name: Gohlke, Steffen
name: Langerfeld, Thorsten
name: Bergschneider, Andrea
name: Köhl, Michael
Publisher: name: arXiv
Year: 2023
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Optical fiber Fabry-Perot cavities have been a development facilitating the efficient integration of high-finesse cavities into fiber-optic assemblies. In this work, we demonstrate coupling of two high-finesse fiber cavities by direct photon tunneling between them. We detect the coupled mode spectra and demonstrated the variability of coupling strength and dissipation rates for different transverse modes. Moreover, we observe very narrow spectral features resulting from a dynamical generalizaton of electromagnetically-induced transparency showing that even dissipative systems without metastable states can feature long-lived coherences.
Greener Air Traffic Operations - The GreAT Project
Creators: name: Finke, Michael
Publisher: name: Zenodo
Year: 2022
Subjects: GreAT
green aviation
H2020 Transport
climate change
CINEA
air traffic operations

description: Presentation at the 12th EASN International Conference on "Innovation in Aviation & Space for opening New Horizons", Barcelona, Spain, 18-21/10/22, http://easnconference.eu/
title: Проблемы поиска нефти в середине 1950-х гг. на юге Тюменской области (на примере Покровской/Ишимской нефтеразведки)
title: Challenges of Oil Exploration in the South of the Tyumen Region in the Mid 1950s (Using the Example of Pokrovskoe/Ishimskoe Filed)
Creators: name: Лешукова, Елена Владимировна
Publisher: name: Издательский центр СурГУ
Year: 2022

description: Настоящее исследование предпринято с целью актуализировать научное внимание к проблеме поиска нефти на юге Тюменской области в середине 1950-х гг. и восполнить пробел
в сложившейся в отечественной историографии общей картине поиска «черного золота» в 1950–
1960 гг. На основании сравнительного анализа впервые введенных в научный оборот документальных материалов из фондов Государственного архива социально-политической истории Тюменской
области, отразивших результаты производственной деятельности одной из крупных экспедиций
в структуре треста «Тюменьнефтегеология» – Покровской/Ишимской нефтеразведочной экспедиции,
в статье представлена характеристика проблем процесса нефтяного поиска в южных районах Тюменской области в середине прошлого века.
description: This study has been undertaken in order to attract attention of the scientific community
to the challenges of oil exploration in the south of the Tyumen region in the mid-1950s and in order to fill the
gap in the overall picture of “black gold” exploration in the 1950s and 1960s, formed in the Russian historiography. Based on the comparative analysis of records of the State Archive of Social and Political History of
the Tyumen Region, introduced into the scientific discourse for the first time and reflecting the results of one
of the major oil exploration expeditions of "Tyumenneftegeologiya" – Pokrovskaya/Ishimskaya, the article
describes the challenges of oil exploration in the south of the Tyumen region in the mid-1950s.
Journal of Urban Mathematics Education, Vol. 16 No. 1 (2023)
Creators: name: Journal Of Urban Mathematics Education
Publisher: name: Journal of Urban Mathematics Education
Year: 2023

description: Equity, Excellence, and Editorial Ethics: You’re an Editor, Now What?...1-9 Applying Symbolic Convergence Theory to Pre-service Teachers’ Responses to Mathematics Education Organizations’ Statements on Racial Violence...72-95 What do you Meme? An Investigation of Social Media and Mathematical Identity...40-71 Centering Humanity within Ethnographic Research: A Critical Read of Black Boys’ Lived and Everyday Experiences in STEM...96-106 Entangling and Disentangling Inquiry and Equity: Voices of Mathematics Education and Mathematics Professors...10-39
Neutrino nonradiative decay and the diffuse supernova neutrino background
Creators: name: Iváñez-Ballesteros, Pilar
name: Volpe, M. Cristina
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The diffuse supernova neutrino background (DSNB) is the constant flux of neutrinos and antineutrinos emitted by all past core collapses in the observable Universe. We study the potential to extract information on the neutrino lifetime from the upcoming observation of the DSNB flux. The DSNB flux has a unique sensitivity to neutrino nonradiative decay for $τ/ m \in \left[ 10^9, 10^{11}\right]$~s/eV. To this end, we integrate, for the first time, astrophysical uncertainties, the contribution from failed supernovae, and a three-neutrino description of neutrino nonradiative decay. We present our predictions for future detection at the running Super-Kamiokande + Gd and the upcoming Hyper-Kamiokande, JUNO, and DUNE experiments. Finally, our results show the importance of identifying the neutrino mass ordering to restrict the possible decay scenarios for the impact of nonradiative neutrino decay on the DSNB.
description: Submitted to Proceedings of Science, XVIII International Conference on Topics in Astroparticle and Underground Physics (TAUP2023). 6 pages, 4 figures
Reply to "Comment on 'Lattice Gluon and Ghost Propagators, and the Strong Coupling in Pure SU(3) Yang-Mills Theory: Finite Lattice Spacing and Volume Effects' "
Creators: name: Duarte, Anthony G.
name: Oliveira, Orlando
name: Silva, Paulo J.
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The quenched gluon and ghost propagator data published in [1] is reanalysed following the suggestion of [2] to resolve the differences between the infrared data of the simulations. Our results confirms that the procedure works well either for the gluon or for the ghost propagator but not for both propagators simultaneously as the observed deviations in the data follow opposite patterns. Definitive conclusions require improving the determination of the (ratios) of lattice spacings. A simple procedure for the relative calibration of the lattice spacing in lattice simulations is suggested.
description: Ghost plots replaced. Conclusions unchanged
A generalization of the Lomnitz logarithmic creep law via Hadamard fractional calculus
Creators: name: Garra, Roberto
name: Mainardi, Francesco
name: Spada, Giorgio
Publisher: name: arXiv
Year: 2017
Subjects: subject: Complex Variables (math.CV)
subject: Materials Science (cond-mat.mtrl-sci)
subject: Mathematical Physics (math-ph)
subject: Geophysics (physics.geo-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 26A33, 45D05, 74D05, 74L10, 76A10

description: We present a new approach based on linear integro-differential operators with logarithmic kernel related to the Hadamard fractional calculus in order to generalize, by a parameter $ν\in (0,1]$, the logarithmic creep law known in rheology as Lomnitz law (obtained for $ν=1$). We derive the constitutive stress-strain relation of this generalized model in a form that couples memory effects and time-varying viscosity. Then, based on the hereditary theory of linear viscoelasticity, we also derive the corresponding relaxation function by solving numerically a Volterra integral equation of the second kind. So doing we provide a full characterization of the new model both in creep and in relaxation representation, where the slow varying functions of logarithmic type play a fundamental role as required in processes of ultra slow kinetics.
description: 15 pages, 2 figures, to appear in Chaos, Solitons and Fractals (2017)
Role of multiorbital effects in the magnetic phase diagram of iron-pnictides
Creators: name: Christensen, Morten H.
name: Scherer, Daniel D.
name: Kotetes, Panagiotis
name: Andersen, Brian M.
Publisher: name: arXiv
Year: 2017
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We elucidate the pivotal role of the bandstructure's orbital content in deciding the type of commensurate magnetic order stabilized within the itinerant scenario of iron-pnictides. Recent experimental findings in the tetragonal magnetic phase attest to the existence of the so-called charge and spin ordered density wave over the spin-vortex crystal phase, the latter of which tends to be favored in simplified band models of itinerant magnetism. Here we show that employing a multiorbital itinerant Landau approach based on realistic bandstructures can account for the experimentally observed magnetic phase, and thus shed light on the importance of the orbital content in deciding the magnetic order. In addition, we remark that the presence of a hole pocket centered at the Brillouin zone's ${\rm M}$-point favors a magnetic stripe rather than a tetragonal magnetic phase. For inferring the symmetry properties of the different magnetic phases, we formulate our theory in terms of magnetic order parameters transforming according to irreducible representations of the ensuing D$_{\rm 4h}$ point group. The latter method not only provides transparent understanding of the symmetry breaking schemes but also reveals that the leading instabilities always belong to the $\{A_{1g},B_{1g}\}$ subset of irreducible representations, independent of their C$_2$ or C$_4$ nature.
description: 11 pages, 6 figures
Search for $α$-cluster states in even-even Cr isotopes
Creators: name: Souza, M. A.
name: Miyake, H.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The $α+ \mathrm{core}$ structure is investigated in even-even Cr isotopes from the viewpoint of the local potential model. The comparison of $Q_α/A$ values for even-even Cr isotopes and even-even $A = 46,54,56,58$ isobars indicates that $^{46}$Cr and $^{54}$Cr are the most favorable even-even Cr isotopes for $α$-clustering. The ground state bands of the two Cr isotopes are calculated through a local $α+ \mathrm{core}$ potential with two variable parameters. The calculated spectra give a very good description of most experimental $^{46}$Cr and $^{54}$Cr levels. The reduced $α$-widths, rms intercluster separations and $B(E2)$ transition rates are determined for the ground state bands. The calculations reproduce the order of magnitude of the available experimental $B(E2)$ values without using effective charges and indicate that the first members of the ground state bands present a stronger $α$-cluster character. The volume integral per nucleon pair and rms radius obtained for the $α+^{50}$Ti potential are consistent with those reported previously in the analysis of $α$ elastic scattering on $^{50}$Ti.
Magnetic helicity in rotating neutron stars
Creators: name: Dvornikov, Maxim
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study the magnetic helicity evolution in neutron stars (NSs). First, we analyze how the surface terms affect the conservation law for the sum of the chiral imbalance of the charged particle densities and the density of the magnetic helicity. Our results are applied to a system with a finite volume, which can be a magnetized NS. We show that the contribution of these surface terms can potentially lead to the reconnection of magnetic field lines followed by X-ray or gamma bursts observed in magnetars. Comparing the new quantum surface term with the classical contribution known in the standard magnetic hydrodynamics, we obtain that its contribution dominates over the classical term only for NS with a rigid rotation. Second, we study the dynamics of chiral electrons which interact electroweakly with a background fermions having the velocity, arbitrarily depending on spatial coordinates, and the nonuniform density. We derive the the kinetic equations and the effective action for right and left particles. The correction to the Adler anomaly and to the anomalous electric current are obtained in the case of a rotating matter. Then, the obtained results are applied for the study of the magnetic helicity flow inside a magnetized rotating NS. We compute the characteristic time of the helicity change and demonstrate that it coincides with the the magnetic cycle period of certain pulsars.
description: 29 pages in LaTeX2e, 2 eps figures; mini review based on talk given in Helicity 2020. To be published in "Helicities in Geophysics, Astrophysics, and Beyond", ed. by K.Kuzanyan, N.Yokoi, M.K.Georgoulis, and R.Stepanov (AGU, Wiley, 2024)
Le Plan de gestion de données de la recherche : lignes directrices et modèles pour son élaboration
Creators: name: Martín González, Yolanda
Publisher: name: Zenodo
Year: 2023
Subjects: Plan de gestión de datos; Datos de investigación; Repositorios de datos

description: Présentation réalisée dans le cadre d'un séjour ERASMUS teaching mobiliity à l'université de Lille (France).
description: Cet atelier fait partie des activités menées dans le cadre du projet Data literacy in the university context : detection of needs, design of open training scenarios and elaboration of a competence reference framework (ALFADATAUniv), (PID2020-116233RB-100), financé par le Ministère de la Science et de l'Innovation (Espagne).
Privacy-Preserving Data Sharing in Agriculture: Enforcing Policy Rules for Secure and Confidential Data Synthesis
Creators: name: Kotal, Anantaa
name: Elluri, Lavanya
name: Gupta, Deepti
name: Mandalapu, Varun
name: Joshi, Anupam
Publisher: name: arXiv
Year: 2023
Subjects: subject: Cryptography and Security (cs.CR)
subject: Artificial Intelligence (cs.AI)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Big Data empowers the farming community with the information needed to optimize resource usage, increase productivity, and enhance the sustainability of agricultural practices. The use of Big Data in farming requires the collection and analysis of data from various sources such as sensors, satellites, and farmer surveys. While Big Data can provide the farming community with valuable insights and improve efficiency, there is significant concern regarding the security of this data as well as the privacy of the participants. Privacy regulations, such as the EU GDPR, the EU Code of Conduct on agricultural data sharing by contractual agreement, and the proposed EU AI law, have been created to address the issue of data privacy and provide specific guidelines on when and how data can be shared between organizations. To make confidential agricultural data widely available for Big Data analysis without violating the privacy of the data subjects, we consider privacy-preserving methods of data sharing in agriculture. Deep learning-based synthetic data generation has been proposed for privacy-preserving data sharing. However, there is a lack of compliance with documented data privacy policies in such privacy-preserving efforts. In this study, we propose a novel framework for enforcing privacy policy rules in privacy-preserving data generation algorithms. We explore several available agricultural codes of conduct, extract knowledge related to the privacy constraints in data, and use the extracted knowledge to define privacy bounds in a privacy-preserving generative model. We use our framework to generate synthetic agricultural data and present experimental results that demonstrate the utility of the synthetic dataset in downstream tasks. We also show that our framework can evade potential threats and secure data based on applicable regulatory policy rules.
Properties of the water to boron nitride interaction: from zero to two dimensions with benchmark accuracy
Creators: name: Al-Hamdani, Yasmine S.
name: Rossi, Mariana
name: Alfè, Dario
name: Tsatsoulis, Theodoros
name: Ramberger, Benjamin
name: Brandenburg, J. Gerit
name: Zen, Andrea
name: Kresse, Georg
name: Grüneis, Andreas
name: Tkatchenko, Alexandre
name: Michaelides, Angelos
Publisher: name: arXiv
Year: 2017
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Molecular adsorption on surfaces plays an important part in catalysis, corrosion, desalination, and various other processes that are relevant to industry and in nature. As a complement to experiments, accurate adsorption energies can be obtained using various sophisticated electronic structure methods that can now be applied to periodic systems. The adsorption energy of water on boron nitride substrates, going from zero to 2-dimensional periodicity, is particularly interesting as it calls for an accurate treatment of polarizable electrostatics and dispersion interactions, as well as posing a practical challenge to experiments and electronic structure methods. Here, we present reference adsorption energies, static polarizabilities, and dynamic polarizabilities, for water on BN substrates of varying size and dimension. Adsorption energies are computed with coupled cluster theory, fixed-node quantum Monte Carlo (FNQMC), the random phase approximation (RPA), and second order Møller-Plesset (MP2) theory. These explicitly correlated methods are found to agree in molecular as well as periodic systems. The best estimate of the water/h-BN adsorption energy is $-107\pm7$ meV from FNQMC. In addition, the water adsorption energy on the BN substrates could be expected to grow monotonically with the size of the substrate due to increased dispersion interactions but interestingly, this is not the case here. This peculiar finding is explained using the static polarizabilities and molecular dispersion coefficients of the systems, as computed from time-dependent density functional theory (DFT). Dynamic as well as static polarizabilities are found to be highly anisotropic in these systems. In addition, the many-body dispersion method in DFT emerges as a particularly useful estimation of finite size effects for other expensive, many-body wavefunction based methods.
Self-regulating Supply-Demand Systems
Creators: name: Pournaras, Evangelos
name: Yao, Mark
name: Helbing, Dirk
Publisher: name: arXiv
Year: 2017
Subjects: subject: Systems and Control (eess.SY)
subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: Supply-demand systems in Smart City sectors such as energy, transportation, telecommunication, are subject of unprecedented technological transformations by the Internet of Things. Usually, supply-demand systems involve actors that produce and consume resources, e.g. energy, and they are regulated such that supply meets demand, or demand meets available supply. Mismatches of supply and demand may increase operational costs, can cause catastrophic damage in infrastructure, for instance power blackouts, and may even lead to social unrest and security threats. Long-term, operationally offline and top-down regulatory decision-making by governmental officers, policy makers or system operators may turn out to be ineffective for matching supply-demand under new dynamics and opportunities that Internet of Things technologies bring to supply-demand systems, for instance, interactive cyber-physical systems and software agents running locally in physical assets to monitor and apply automated control actions in real-time. e.g. power flow redistributions by smart transformers to improve the Smart Grid reliability. Existing work on online regulatory mechanisms of matching supply-demand either focuses on game-theoretic solutions with assumptions that cannot be easily met in real-world systems or assume centralized management entities and local access to global information. This paper contributes a generic decentralized self-regulatory framework, which, in contrast to related work, is shaped around standardized control system concepts and Internet of Things technologies for an easier adoption and applicability. The framework involves a decentralized combinatorial optimization mechanism that matches supply-demand under different regulatory scenarios.
Variation of multi-Slater determinants in antisymmetrized molecular dynamics and its application to $^{10}$Be with various clustering
Creators: name: Myo, Takayuki
name: Lyu, Mengjiao
name: Zhao, Qing
name: Isaka, Masahiro
name: Wan, Niu
name: Takemoto, Hiroki
name: Horiuchi, Hisashi
Publisher: name: arXiv
Year: 2023
Subjects: subject: Nuclear Theory (nucl-th)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: We propose a method to optimize the multi-Slater determinants of the antisymmetrized molecular dynamics (AMD) in the linear combination form and apply it to the neutron-rich $^{10}$Be nucleus. The individual Slater determinants and their weights in the superposition are determined simultaneously according to the variational principle of the energy of the total wave function. The multi-AMD basis states of $^{10}$Be show various cluster structures as well as the shell-model type. In the cluster configurations, different intercluster distances are superposed automatically indicating the role of the generator coordinates. We further introduce a procedure to obtain the configurations for the excited states imposing the orthogonal condition to the ground-state configurations. In the excited states of $^{10}$Be, the linear-chain-like structure is confirmed consisting of various clusters. The energy spectrum using the obtained basis states reproduces the experiments. The present framework can be the method to find the optimal multi-configuration for nuclear ground and excited states.
description: 13 pages, 8 figures
Recycling by-design of plastics through thermally protected enzymes
Creators: name: Romano, Angela
name: Rosato, Antonella
name: Totaro, Grazia
name: Zanaroli, Giulio
name: Celli, Annamaria
name: Sisti, Laura
Publisher: name: Zenodo
Year: 2023
Subjects: enzyme immobilization
thermal resistance
polymer formulation

description: Packaging accounts for more than 40% of all plastics produced every year and plastic accumulation in the environment has become a serious problem, thus the improvement of its circularity from origin to subsequent life cycles is now a priority. An effective and eco-friendly approach to solve such problem is the use of biodegradable materials, whose global production capacities are set to increase from around 1.1 million tonnes in 2022 to approximately 3.5 million tonnes in 2027. In particular, a new strategy for the management of plastics is based on the design of polymers that contain degrading enzymes in their formulation: the enzymes should be activated only at the end-of-life of the material. However, the harsh conditions used in most industrial plastic processes cause denaturation and loss of activity of enzymes, thus efficient protection strategies are necessary. In this way, thermally protected enzymes could be embedded in plastic formulation, obtaining novel “degradable on-demand” materials. In the present study, cutinase from Humicola Insolens, selected as a highly degrading polyester hydrolytic enzyme, is immobilized in Mg/Al layered double hydroxide structures. The immobilization efficiency results high and the enzyme thermal stability strongly improves after immobilization, since its half-life at 90°C increases by 6 times.
Accurate halo mass functions from the simplest excursion set theory
Creators: name: Delos, M. Sten
Publisher: name: arXiv
Year: 2023
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Excursion set theory is a powerful and widely used tool for describing the distribution of dark matter haloes, but it is normally applied with simplifying approximations. We use numerical sampling methods to study the mass functions predicted by the theory without approximations. With a spherical top-hat window and a constant $δ=1.5$ threshold, the theory accurately predicts mass functions with the $M_{200}$ mass definition, both unconditional and conditional, in simulations of a range of matter-dominated cosmologies. For $Λ$CDM at the present epoch, predictions lie between the $M_\mathrm{200m}$ and $M_\mathrm{200c}$ mass functions. In contrast, with the same window function, a nonconstant threshold based on ellipsoidal collapse predicts uniformly too few haloes. This work indicates a new way to simply and accurately evaluate halo mass functions, clustering bias, and assembly histories for a range of cosmologies. We provide a simple fitting function that accurately represents the predictions of the theory for a wide range of parameters.
description: 16 pages, 14 figures. Accepted by MNRAS; includes more estimates of statistical uncertainty
(LaTiO$_3$)$_n$/(LaVO$_3$)$_n$ as a model system for unconventional charge transfer and polar metallicity
Creators: name: Weng, Yakui
name: Zhang, Jun-Jie
name: Gao, Bin
name: Dong, Shuai
Publisher: name: arXiv
Year: 2017
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: At interfaces between oxide materials, lattice and electronic reconstructions always play important roles in exotic phenomena. In this study, the density functional theory and maximally localized Wannier functions are employed to investigate the (LaTiO$_3$)$_n$/(LaVO$_3$)$_n$ magnetic superlattices. The electron transfer from Ti$^{3+}$ to V$^{3+}$ is predicted, which violates the intuitive band alignment based on the electronic structures of LaTiO$_3$ and LaVO$_3$. Such unconventional charge transfer quenches the magnetism of LaTiO$_3$ layer mostly and leads to metal-insulator transition in the $n=1$ superlattice when the stacking orientation is altered. In addition, the compatibility among the polar structure, ferrimagnetism, and metallicity is predicted in the $n=2$ superlattice.
description: 8 pages, 5 figures
NuSTAR constrains the origin of gamma rays in RS Oph
Creators: name: Orio, Marina
name: G. Juan M. Luna
Publisher: name: Zenodo
Year: 2022

description: The luminous symbiotic recurrent nova RS Ophiuchi was observed in a new outburst due to a thermonuclear runaway in August of 2021. A NuSTAR observation taken on day 10 after optical maximum, coupled with NICER data, significantly constrain the plasma temperature in the X-ray emitting shocked ejecta to a maximum value of about 6.5 keV or lower, depending in the physical model adopted. The upper limit of the count rate in the 40-79 keV range poses a strict upper limit to the undetected hard X-ray flux in the shock that should have caused the observed gamma rays detected on the same date with H.E.S.S. and with Fermi, either in the case of inverse Compton effect or in the case of particle acceleration. The limit results in a value of the absorbing column density of 1027 cm-2 , indicating that the gamma rays originated in a completely different region than the X-rays observed with NuSTAR and NICER, most likely in the impact of the outflow with the accretion disk or with the red giant atmosphere.
ArabIcros: AI-Powered Arabic Crossword Puzzle Generation for Educational Applications
Creators: name: Zeinalipour, Kamyar
name: Saad, Mohamed Zaky
name: Maggini, Marco
name: Gori, Marco
Publisher: name: arXiv
Year: 2023
Subjects: subject: Computation and Language (cs.CL)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: This paper presents the first Arabic crossword puzzle generator driven by advanced AI technology. Leveraging cutting-edge large language models including GPT4, GPT3-Davinci, GPT3-Curie, GPT3-Babbage, GPT3-Ada, and BERT, the system generates distinctive and challenging clues. Based on a dataset comprising over 50,000 clue-answer pairs, the generator employs fine-tuning, few/zero-shot learning strategies, and rigorous quality-checking protocols to enforce the generation of high-quality clue-answer pairs. Importantly, educational crosswords contribute to enhancing memory, expanding vocabulary, and promoting problem-solving skills, thereby augmenting the learning experience through a fun and engaging approach, reshaping the landscape of traditional learning methods. The overall system can be exploited as a powerful educational tool that amalgamates AI and innovative learning techniques, heralding a transformative era for Arabic crossword puzzles and the intersection of technology and education.
description: Accepted Paper for ArabicNLP 2023 - The First Arabic Natural Language Processing Conference - Co-located with EMNLP 2023 in Singapore
An all optical phase shifter and switch near 1550nm using tungsten disulfide (WS2) deposited tapered fiber
Creators: name: Wu, Kan
name: Guo, Chaoshi
name: Wang, Hao
name: Zhang, Xiaoyan
name: Wang, Jun
name: Chen, Jianping
Publisher: name: arXiv
Year: 2016
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Optical phase shifters and switches play an important role for various optical applications including optical signal processing, sensing and communication. In this paper, we demonstrate a fiber all optical phase shifter using few-layer 2D material tungsten disulfide (WS2) deposited on a tapered fiber. WS2 absorbs injected 980 nm pump (control light) and generates heat which changes the refractive index of the tapered fiber due to thermo-optic effect and achieves a maximum phase shift of 6.1π near 1550 nm. The device has a loss of 3.7 dB. By constructing a Mach-Zehnder interferometer with WS2 based phase shifter in one arm, an all optical switch is also obtained with an extinction ratio of 15 dB and a rise time of 7.3 ms. This all fiber low-cost and compact optical phase shifter and switch demonstrates the potential of 2D transition metal dichalcogenides for all optical signal processing devices.
description: 11 pages, 6 figures
Modeling the dynamics of quantum systems coupled to large dimensional baths using effective energy states
Creators: name: Attal, Loïse
name: Falvo, Cyril
name: Calvo, Florent
name: Parneix, Pascal
Publisher: name: arXiv
Year: 2023
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: Computational Physics (physics.comp-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The quantum dynamics of a low-dimensional system in contact with a large but finite harmonic bath is theoretically investigated by coarse-graining the bath into a reduced set of effective energy states. In this model, the couplings between the system and the bath are obtained from the statistical average over the discrete, degenerate effective states. Our model is aimed at intermediate bath sizes in which non-Markovian processes and energy transfer between the bath and the main system are important. The method is applied to a model system of a Morse oscillator coupled to 40 harmonic modes. The results are found to be in excellent agreement with the direct quantum dynamics simulations of Bouakline et al. [J. Phys. Chem. A 116, 11118-11127 (2012)], but at a much lower computational cost. Extension to larger baths is discussed in comparison to the time-convolutionless method. We also extend this study to the case of a microcanonical bath with finite initial internal energies. The computational efficiency and convergence properties of the effective bath states model with respect to relevant parameters are also discussed.
description: Accepted in J. Chem. Phys. 16 pages, 10 figures
Truthful Allocation Mechanisms Without Payments: Characterization and Implications on Fairness
Creators: name: Amanatidis, Georgios
name: Birmpas, Georgios
name: Christodoulou, George
name: Markakis, Evangelos
Publisher: name: arXiv
Year: 2017
Subjects: subject: Computer Science and Game Theory (cs.GT)
subject: FOS: Computer and information sciences

description: We study the mechanism design problem of allocating a set of indivisible items without monetary transfers. Despite the vast literature on this very standard model, it still remains unclear how do truthful mechanisms look like. We focus on the case of two players with additive valuation functions and our purpose is twofold. First, our main result provides a complete characterization of truthful mechanisms that allocate all the items to the players. Our characterization reveals an interesting structure underlying all truthful mechanisms, showing that they can be decomposed into two components: a selection part where players pick their best subset among prespecified choices determined by the mechanism, and an exchange part where players are offered the chance to exchange certain subsets if it is favorable to do so. In the remaining paper, we apply our main result and derive several consequences on the design of mechanisms with fairness guarantees. We consider various notions of fairness, (indicatively, maximin share guarantees and envy-freeness up to one item) and provide tight bounds for their approximability. Our work settles some of the open problems in this agenda, and we conclude by discussing possible extensions to more players.
description: To appear in the 18th ACM Conference on Economics and Computation (ACM EC '17)