cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Long-term forcing of Sun's coronal field, open flux and cosmic ray modulation potential during grand minima, maxima and regular activity phases by the solar dynamo mechanism
Creators: name: Dash, Soumyaranjan
name: Nandy, Dibyendu
name: Usoskin, Ilya
Publisher: name: arXiv
Year: 2022
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: Magnetic fields generated in the Sun's interior by the solar dynamo mechanism drive solar activity over a range of time-scales. While space-based observations of the Sun's corona exist only for few decades, direct sunspot observations exist for a few centuries, solar open flux and cosmic ray flux variations can be reconstructed through studies of cosmogenic isotopes over thousands of years. While such reconstructions indicate the presence of extreme solar activity fluctuations in the past, causal links between millennia scale dynamo activity, consequent coronal field, solar open flux and cosmic ray modulation remain elusive. By utilizing a stochastically forced solar dynamo model we perform long-term simulations to illuminate how the dynamo generated magnetic fields govern the structure of the solar corona and the state of the heliosphere -- as indicated by variations in the open flux and cosmic ray modulation potential. We establish differences in the nature of the large-scale structuring of the solar corona during grand maximum, minimum, and regular solar activity phases and simulate how the open flux and cosmic ray modulation potential varies over time scales encompassing these different phases of solar activity. We demonstrate that the power spectrum of simulated and reconstructed solar open flux are consistent with each other. Our study provides the theoretical basis for interpreting long-term solar cycle variability based on reconstructions relying on cosmogenic isotopes and connects solar internal variations to the forcing of the state of the heliosphere.
description: 15 Pages, 8 Figures, In Press (MNRAS)
The world of long-range interactions: A bird's eye view
Creators: name: Gupta, Shamik
name: Ruffo, Stefano
Publisher: name: arXiv
Year: 2017
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: FOS: Physical sciences

description: In recent years, studies of long-range interacting (LRI) systems have taken centre stage in the arena of statistical mechanics and dynamical system studies, due to new theoretical developments involving tools from as diverse a field as kinetic theory, non-equilibrium statistical mechanics, and large deviation theory, but also due to new and exciting experimental realizations of LRI systems. In this invited contribution, we discuss the general features of long-range interactions, emphasizing in particular the main physical phenomenon of non-additivity, which leads to a plethora of distinct effects, both thermodynamic and dynamic, that are not observed with short-range interactions: Ensemble inequivalence, slow relaxation, broken ergodicity. We also discuss several physical systems with long-range interactions: mean-field spin systems, self-gravitating systems, Euler equations in two dimensions, Coulomb systems, one-component electron plasma, dipolar systems, free-electron lasers, atoms trapped in optical cavities.
description: Invited contribution to a special issue on the occasion of Abdus Salam's 90th birthday; v2: Refs. added
Lifelong Learning for Neural powered Mixed Integer Programming
Creators: name: Manchanda, Sahil
name: Ranu, Sayan
Publisher: name: arXiv
Year: 2022
Subjects: subject: Optimization and Control (math.OC)
subject: Machine Learning (cs.LG)
subject: FOS: Mathematics
subject: FOS: Computer and information sciences

description: Mixed Integer programs (MIPs) are typically solved by the Branch-and-Bound algorithm. Recently, Learning to imitate fast approximations of the expert strong branching heuristic has gained attention due to its success in reducing the running time for solving MIPs. However, existing learning-to-branch methods assume that the entire training data is available in a single session of training. This assumption is often not true, and if the training data is supplied in continual fashion over time, existing techniques suffer from catastrophic forgetting. In this work, we study the hitherto unexplored paradigm of Lifelong Learning to Branch on Mixed Integer Programs. To mitigate catastrophic forgetting, we propose LIMIP, which is powered by the idea of modeling an MIP instance in the form of a bipartite graph, which we map to an embedding space using a bipartite Graph Attention Network. This rich embedding space avoids catastrophic forgetting through the application of knowledge distillation and elastic weight consolidation, wherein we learn the parameters key towards retaining efficacy and are therefore protected from significant drift. We evaluate LIMIP on a series of NP-hard problems and establish that in comparison to existing baselines, LIMIP is up to 50% better when confronted with lifelong learning.
Fostering Indigenous Futurity: Applying insights from examining Australia's education system at the cultural interface
Creators: name: Birchmeier, Katrina
Publisher: name: The Australian National University
Year: 2023
Subjects: Indigenous education
Indigenous futurity
cultural interface
Closing the Gap
Australian National Curriculum

description: The objective of Indigenous education policy in Australia is to generate better life outcomes for Indigenous young people. Problematically, these policies are underscored by an assumption of aspirational unity between Indigenous and non-Indigenous Australians, and the Government’s pursuit for equality between Indigenous learners and their non-Indigenous peers. This thesis describes the development and application of two frameworks to query the current policy approaches to Indigenous education, exploring the notion that if better future outcomes for Indigenous young people through education are to be achieved, a more expansive and reflexive way of thinking about Indigenous learners and education is required. Drawing on Nakata’s concept of the cultural interface, the Framework for Indigenous Futurity at the Cultural Interface of Education emerges as a tool which can be used to interrogate the Western context of education by engaging an Indigenous standpoint. Through this analysis, a more holistic picture of the factors and dynamics that play a role in the educational experiences and future outcomes for Indigenous learners begins to emerge. To operationalise the cultural interface in a practical way, this thesis proposes the Indigenous Futurity Outcomes Framework as an analytical tool for decision-makers. This tool offers a reflexive space from which to examine the interplay between representation, power, and self-determination in education policies and programs by placing Indigenous futurity as the central concern. Applying the frameworks to case studies from the Australian education system demonstrates how the two tools can work together to generate an understanding of whether Indigenous education policy or program intent accords with Indigenous learners’ aspirations, or whether their learning experience is framed by the system. In doing so, the case study analyses highlight policy and education environments that are either resistant to change, constraining the future outcomes for Indigenous learners, or environments that are open to transformation with the capacity to foster Indigenous futurity.
Classification of sign-problem-free relativistic fermions on the basis of the Majorana positivity
Creators: name: Hayata, Tomoya
name: Yamamoto, Arata
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Lattice (hep-lat)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We classify the sign-problem-free relativistic fermion actions on the basis of the Majorana representation. In the Majorana representation, the sign-problem-free condition is given by the semi-positivity of a Pfaffian. We show that the known sign-problem-free actions of the Dirac fermions, which are usually understood from the semi-positivity of a determinant, e.g., the action of quantum chromodynamics with nonzero chiral chemical potential or nonzero isospin chemical potential, can also be understood from the semi-positivity of a Pfaffian. We also derive new classes of the sign-problem-free relativistic fermion actions with Majorana-type source terms.
description: 19 pages, no figure, v2: references added, derivation elaborated, v3: accepted version for publication in PTEP
Gaze Distribution Analysis and Saliency Prediction Across Age Groups
Creators: name: Krishna, Onkar
name: Aizawa, Kiyoharu
name: Helo, Andrea
name: Pia, Rama
Publisher: name: arXiv
Year: 2017
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: Knowledge of the human visual system helps to develop better computational models of visual attention. State-of-the-art models have been developed to mimic the visual attention system of young adults that, however, largely ignore the variations that occur with age. In this paper, we investigated how visual scene processing changes with age and we propose an age-adapted framework that helps to develop a computational model that can predict saliency across different age groups. Our analysis uncovers how the explorativeness of an observer varies with age, how well saliency maps of an age group agree with fixation points of observers from the same or different age groups, and how age influences the center bias. We analyzed the eye movement behavior of 82 observers belonging to four age groups while they explored visual scenes. Explorativeness was quantified in terms of the entropy of a saliency map, and area under the curve (AUC) metrics was used to quantify the agreement analysis and the center bias. These results were used to develop age adapted saliency models. Our results suggest that the proposed age-adapted saliency model outperforms existing saliency models in predicting the regions of interest across age groups.
Deep Learning-Based Position Detection for Hydraulic Cylinders Using Scattering Parameters
Creators: name: Xin, Chen
name: Motz, Thomas
name: Fuhl, Wolfgang
name: Hartel, Andreas
name: Kasneci, Enkelejda
Publisher: name: arXiv
Year: 2022
Subjects: subject: Signal Processing (eess.SP)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: Position detection of hydraulic cylinder pistons is crucial for numerous industrial automation applications. A typical traditional method is to excite electromagnetic waves in the cylinder structure and analytically solve the piston position based on the scattering parameters measured by a sensor. The core of this approach is a physical model that outlines the relationship between the measured scattering parameters and the targeted piston position. However, this physical model has shortcomings in accuracy and adaptability, especially in extreme conditions. To address these limitations, we propose machine learning and deep learning-based methods to learn the relationship directly in a data-driven manner. As a result, all deep learning models in this paper consistently outperform the physical one by a large margin. We further deliberate on the choice of models based on domain knowledge and provide in-depth analyses combining model performance with real-world physical characteristics. Specifically, we use Convolutional Neural Network (CNN) to discover local interactions of input among adjacent frequencies, apply Complex-Valued Neural Network (CVNN) to exploit the complex-valued nature of electromagnetic scattering parameters, and introduce a novel technique named Frequency Encoding to add weighted frequency information to the model input. The combination of these techniques results in our best-performing model, a complex-valued CNN with Frequency Encoding, which exhibits substantial improvement in accuracy with an error reduction of 1/12 compared to the traditional physical model.
description: 19 pages, 10 figures
A Bayesian Approach to Identify Bitcoin Users
Creators: name: Juhász, Péter L.
name: Stéger, József
name: Kondor, Dániel
name: Vattay, Gábor
Publisher: name: arXiv
Year: 2016
Subjects: subject: Applications (stat.AP)
subject: Cryptography and Security (cs.CR)
subject: FOS: Computer and information sciences

description: Bitcoin is a digital currency and electronic payment system operating over a peer-to-peer network on the Internet. One of its most important properties is the high level of anonymity it provides for its users. The users are identified by their Bitcoin addresses, which are random strings in the public records of transactions, the blockchain. When a user initiates a Bitcoin-transaction, his Bitcoin client program relays messages to other clients through the Bitcoin network. Monitoring the propagation of these messages and analyzing them carefully reveal hidden relations. In this paper, we develop a mathematical model using a probabilistic approach to link Bitcoin addresses and transactions to the originator IP address. To utilize our model, we carried out experiments by installing more than a hundred modified Bitcoin clients distributed in the network to observe as many messages as possible. During a two month observation period we were able to identify several thousand Bitcoin clients and bind their transactions to geographical locations.
Demonstration of monogamy relations for Einstein-Podolsky-Rosen steering in Gaussian cluster states
Creators: name: Deng, Xiaowei
name: Xiang, Yu
name: Tian, Caixing
name: Adesso, Gerardo
name: He, Qiongyi
name: Gong, Qihuang
name: Su, Xiaolong
name: Xie, Changde
name: Peng, Kunchi
Publisher: name: arXiv
Year: 2017
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Understanding how quantum resources can be quantified and distributed over many parties has profound applications in quantum communication. As one of the most intriguing features of quantum mechanics, Einstein-Podolsky-Rosen (EPR) steering is a useful resource for secure quantum networks. By reconstructing the covariance matrix of a continuous variable four-mode square Gaussian cluster state subject to asymmetric loss, we quantify the amount of bipartite steering with a variable number of modes per party, and verify recently introduced monogamy relations for Gaussian steerability, which establish quantitative constraints on the security of information shared among different parties. We observe a very rich structure for the steering distribution, and demonstrate one-way EPR steering of the cluster state under Gaussian measurements, as well as one-to-multi-mode steering. Our experiment paves the way for exploiting EPR steering in Gaussian cluster states as a valuable resource for multiparty quantum information tasks.
Διεθνής Πολιτική και Trolling: Πρόκληση για τη διεθνή θεωρία;
Creators: name: Mikelis, Kyriakos
Publisher: name: Syn-Thèses
Year: 2023
Subjects: discipline and theory of International Relations, international politics, trolling/trolls

description: The essay examines the phenomenon of trolling in the context of politics and especially of international politics. Emphasis is given to how trolling functions within International Relations, particularly in respect to a conventional image of the field/discipline. Does it work in an affirmative or in a subversive manner? The usual analysis of trolls in instrumental terms, like ‘‘weapon’’, reinforces the impression that the aforementioned field and the respective theory, in their state-centric manifestation, hold up well. Trolls are used by states, often to strengthen the competitive spirit or regime survival. However, trolls may also be directed against states/regimes or the status quo and mainstream attitudes, at national and supranational levels. At its most extreme, the very understanding of trolling is possible to escape from the classics, namely a kind of aggressive behavior in social media. It further concerns a critical attitude towards certainties and knowledge claims. In short, trolling potentially poses challenges for the characteristics and evolution of politics as well as for the relationship between power and knowledge.
description: Syn-Thèses, No 14 (2023): Epistemology and Semiotics: Information and Sign
Spin current driven by ultrafast magnetization of FeRh
Creators: name: Kang, Kyuhwe
name: Omura, Hiroki
name: Lee, Oukjae
name: Lee, Kyung-Jin
name: Lee, Hyun-Woo
name: Taniyama, Tomoyasu
name: Choi, Gyung-Min
Publisher: name: arXiv
Year: 2022
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Laser-induced ultrafast demagnetization is an important phenomenon that probes arguably ultimate limits of the angular momentum dynamics in solid. Unfortunately, many aspects of the dynamics remain unclear except that the demagnetization transfers the angular momentum eventually to the lattice. In particular, roles of electron-carried spin current are debated. Here we experimentally probe the spin current in the opposite phenomenon, i.e., laser-induced ultrafast magnetization of FeRh, where the laser pump pulse initiates the angular momentum build-up rather than its dissipation. Using the time-resolved magneto-optical Kerr effect, we directly measure the ultrafast-magnetization-driven spin current in a FeRh/Cu heterostructure. Strong correlation between the spin current and the net magnetization change rate of FeRh is found even though the spin filter effect is negligible in this opposite process. This result implies that the angular momentum build-up is achieved by an angular momentum transfer from the electron bath (supplier) to the magnon bath (receiver) and followed by the spatial transport of angular momentum (spin current) and dissipation of angular momentum to the phonon bath (spin relaxation).
description: 12 pages and 4 figure for main text
Biskyrmion-based artificial neuron with refractory period
Creators: name: de Assis, Ismael Ribeiro
name: Mertig, Ingrid
name: Göbel, Börge
Publisher: name: arXiv
Year: 2022
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Magnetic skyrmions are nanoscale magnetic whirls that are highly stable and can be moved by currents which has led to the prediction of a skyrmion-based artificial neuron device with leak-integrate-fire functionality. However, so far, these devices lack a refractory process, estimated to be crucial for neuronal dynamics. Here we demonstrate that a biskyrmion-based artificial neuron overcomes this insufficiency. When driven by spin-orbit torques, a single biskyrmion splits into two subskyrmions that move towards a designated location and can be detected electrically, resembling the excitation process of a neuron that fires ultimately. The attractive interaction of the two skyrmions leads to a unique trajectory: Once they reach the detector area, they automatically return to the center to reform the biskyrmion but on a different path. During this reset period, the neuron cannot fire again. Our suggested device resembles a biological neuron with the leak, integrate, fire and refractory characteristics better than all existing artificial devices so far.
description: Marie Sk{\l}odowska-Curie Actions, H2020-MSCA-ITN-2020; Project acronym SPEAR; Grant Agreement No. 955671
Σημειωτική και Βίβλος: εφαρμογές της σημειωτικής στη βιβλική ερμηνευτική
Creators: name: Papadimitriou, Kyriakoula
Publisher: name: Syn-Thèses
Year: 2023
Subjects: Semiotics and the Bible, Criticism Semiotics and the Bible, Semiotic hermeneutic analysis, Hermeneutics of biblical texts

description: The paper is a brief presentation of the relationship between the sciences of Semiotics and Hermeneutics of biblical texts and verification of the possibility of their successful collaboration. It clarifies the limits and terms of using semiotic analysis as an interpretive method of the Bible. It highlights the advantages offered by the modern and post-modern versions of Semiotics in understanding the message and its production from the texts of the Bible. There is reference to the actions developed in the Department of Social Theology and Christian Culture of the Aristotle University of Thessaloniki (AUTH) based on the utilization of semiotic theory in the interpretation of biblical texts, which are mainly the following two: a) The educational seminar "Semiotics and the Bible," which develops issues of applying the semiotic theory to the texts of the Bible, with the aim of its interpretative understanding with modern ways of approaching its meaning. The seminar is organized by the Biblical Studies Laboratory of the Department of Social Theology and Christian Culture AUTH and is conducted in collaboration with the Center for the Analysis of Religious Discourse (C.A.D.I.R.) of the Catholic University of Lyon and with the Semiotics Laboratory SemioLab of the Faculty of Philosophy of AUTH. And, b) The summer elective course "Semiotics and the Bible," which is included in the undergraduate curriculum of the Department of Social Theology and Christian Culture of AUTH and considers the semiotic analysis of biblical texts, defining the epistemological frameworks within which it can be conducted.
description: Syn-Thèses, No 14 (2023): Epistemology and Semiotics: Information and Sign
Η συμβολή της σημειωτικής στην σύλληψη οντολογίας από κείμενα
Creators: name: Sarakatsianou, Dimitra
name: Koloniari, Georgia
Publisher: name: Syn-Thèses
Year: 2023
Subjects: ontology capture, semantic technology, text, textual semantics

description: The advent of the digital age has brought significant changes to the daily lives of humanity. Many human activities were redefined in the context of a new, virtual space, the world of the Internet. This networked space, with its innumerable data and abundance of information, is faced with a serious issue, the "information chaos". In short, this issue is closely associated with the correct retrieval of information achieved mechanically. Understanding and describing the real world plays an important role, among many others, in addressing this issue. On the World Wide Web, this process is carried out using digital semantic technologies, such as, for example, ontologies that have undertaken the conceptual description of the world and its representation. Besides, a very great part of knowledge and information is found in texts which become the input corpus for the capture of ontologies. In this context, this paper aims to explore the links that bring together the fields of ontological engineering and (textual) semiotics. The challenge emerging is the adoption of the fundamental principles of structural and interpretative semantics in conceptualizing ontology from texts. The general basic question that this paper answer is whether semiotics can support ontology capture from texts.
description: Syn-Thèses, No 14 (2023): Epistemology and Semiotics: Information and Sign
More efficient formulas for efficiency correction of cumulants and effect of using averaged efficiency
Creators: name: Nonaka, Toshihiro
name: Kitazawa, Masakiyo
name: Esumi, ShinIchi
Publisher: name: arXiv
Year: 2017
Subjects: subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Experiment (nucl-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We derive formulas for the efficiency correction of cumulants with many efficiency bins. The derivation of the formulas is simpler than the previously suggested method, but the numerical cost is drastically reduced from the naive method. From analytical and numerical analyses in simple toy models, we show that the use of the averaged efficiency in the efficiency correction can lead to wrong corrected values, which have larger deviation for higher order cumulants. These analyses show the importance of carrying out the efficiency correction without taking the average.
description: 13 pages, 5 figures. Discussions regarding calculation cost has been added in IIID
Η V&V ράβδος ως μέσο αμέσου και ‘ειλικρινούς’ μεταφοράς του αισθητού στο ιδεατό
Creators: name: Kambakis-Vougiouklis, Penelope
name: Vougiouklis, Thomas
Publisher: name: Syn-Thèses
Year: 2023
Subjects: V&V bar, Likert scales, fuzzy set theory, questionnaires

description: The VV bar is a tool for completing and editing questionnaires, an alternative to Likert scales. It was introduced in 2008 and since then many of the aspects and possibilities it provides to both researchers and informants have been highlighted and studied, in terms of completing and processing the questionnaires. Its main advantages are the drastic reduction of the time of filling in the questionnaires, the avoidance of verbal characterizations of the subdivisions, e.g. good enough, good, very good, excellent, and, finally, the many possibilities of data processing to make them comparable to other researchers’. In other words, it is a record of a subjective situation or phenomenon, so close to the objective that we dare to call it 'sincere'. With this presentation we will try to highlight the last, mainly, advantage in the research of Applied Linguistics.
description: Syn-Thèses, No 14 (2023): Epistemology and Semiotics: Information and Sign
Distributed-Something: scripts to leverage AWS storage and computing for distributed workflows at scale
Creators: name: Weisbart, Erin
name: Cimini, Beth A.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: FOS: Computer and information sciences

description: Distributed-Something coordinates the distribution of any Dockerized workflow using on-demand computational infrastructure from Amazon Web Services to enable at-scale workflows where neither computing power nor data storage are limited by local availability while minimizing the time-consuming and confusing aspects of architecture coordination. We also provide Distributed-Something implementations of several bioimaging tools: Distributed-CellProfiler, -Fiji, and -OmeZarrCreator. All are open-source and available at http://GitHub.com/DistributedScience.
description: 7 pages, 1 figure, 1 supplementary table
Spin current and chirality degrees of freedom inherent in localized electron orbitals
Creators: name: Hoshino, Shintaro
name: Suzuki, Michi-To
name: Ikeda, Hiroaki
Publisher: name: arXiv
Year: 2022
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: In solid state physics, any phase transition is commonly observed as a change in the microscopic distribution of charge, spin, or current. Here we report the nature of an exotic order parameter inherent in the localized electron orbitals that cannot be primarily captured by these three fundamental quantities. This order parameter is described as the electric toroidal multipoles connecting different total angular momenta under the spin-orbit coupling. The corresponding microscopic physical quantity is the spin current tensor on an atomic scale, which induces spin-derived electric polarization and the chirality of the Dirac equation. We stress that the chirality intrinsic to the elementary particle is the essence of electric toroidal multipoles. These findings link microscopic spin currents and chirality in the Dirac theory to the concept of multipoles and provide a new perspective for quantum states of matter.
description: 9 pages, 4 figures
Quantum Dynamics of Vibrational Polariton Chemistry
Creators: name: Lindoy, Lachlan P.
name: Mandal, Arkajit
name: Reichman, David R.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: Other Condensed Matter (cond-mat.other)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: We employ an exact quantum mechanical simulation technique to investigate a model of cavity-modified chemical reactions in the condensed phase. The model contains the coupling of the reaction coordinate to a generic solvent, cavity coupling to either the reaction coordinate or a non-reactive mode, and the coupling of the cavity to lossy modes. Thus, many of the most important features needed for realistic modeling of the cavity modification of chemical reactions are included. We find that when a molecule is coupled to an optical cavity it is essential to treat the problem quantum mechanically in order to obtain a quantitative account of alterations to reactivity. We find sizable and sharp changes in the rate constant that are associated with quantum mechanical state splittings and resonances. The features that emerge from our simulations are closer to those observed in experiments than are previous calculations, even for realistically small values of coupling and cavity loss. This work highlights the importance of a fully quantum treatment of vibrational polariton chemistry.
Central pattern generators evolved for real-time adaptation to rhythmic stimuli
Creators: name: Szorkovszky, Alex
name: Veenstra, Frank
name: Glette, Kyrre
Publisher: name: arXiv
Year: 2022
Subjects: subject: Robotics (cs.RO)
subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: For a robot to be both autonomous and collaborative requires the ability to adapt its movement to a variety of external stimuli, whether these come from humans or other robots. Typically, legged robots have oscillation periods explicitly defined as a control parameter, limiting the adaptability of walking gaits. Here we demonstrate a virtual quadruped robot employing a bio-inspired central pattern generator (CPG) that can spontaneously synchronize its movement to a range of rhythmic stimuli. Multi-objective evolutionary algorithms were used to optimize the variation of movement speed and direction as a function of the brain stem drive and the center of mass control respectively. This was followed by optimization of an additional layer of neurons that filters fluctuating inputs. As a result, a range of CPGs were able to adjust their gait pattern and/or frequency to match the input period. We show how this can be used to facilitate coordinated movement despite differences in morphology, as well as to learn new movement patterns.
description: 26 pages, 9 figures including supplementary material
First-Principles Calculation of Electronic Energy Level Alignment at Electrochemical Interfaces
Creators: name: Azar, Yavar T.
name: Payami, Mahmoud
Publisher: name: arXiv
Year: 2017
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Energy level alignment at solid-solvent interfaces is an important step in determining the properties of electrochemical systems. The positions of conduction and valence band edges of a semiconductor are affected by its environment. In this study, using first-principles DFT calculation, we have determined the level shifts of the semiconductors TiO$_2$ and ZnO at the interfaces with MeCN and DMF solvent molecules. The level shifts of semiconductor is obtained using the potential difference between the clean and exposed surfaces of asymmetric slabs. In this work, neglecting the effects of present ions in the electrolyte solution, we have shown that the solvent molecules give rise to an up-shift for the levels, and the amount of this shift varies with coverage. It is also shown that the shapes of density of states do not change sensibly near the gap. Molecular dynamics simulations of the interface have shown that at room temperatures the semiconductor surface is not fully covered by the solvent molecules, and one must use intermediate values in an static calculations.
description: 8 pages, 7 figures
VALUABLE General press releases available to all partners for dissemination to 3rd Parties in English
Creators: name: Sofía Tarín Roldán
name: Álvaro Cabeza Sánchez
Publisher: name: Zenodo
Year: 2023
Subjects: VALUABLE newsletter, communication and dissemination

description: (Draft deliverable; not yet approved by the European Commission)

This deliverable presents the first VALUABLE newsletter as the first official general press release and an important channel of information available for different interest parties of the project. This welcoming newsletter has the objective of communicating key information and the progress of the project to external stakeholders. It includes links to the VALUABLE social media accounts and website, a brief explanation of the objectives of the project, a presentation of the partners and information about the status.
Faddeev fixed center approximation to $π\bar{K} K^*$ system and the $π_1(1600)$
Creators: name: Zhang, Xu
name: Xie, Ju-Jun
name: Chen, Xurong
Publisher: name: arXiv
Year: 2016
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: Nuclear Experiment (nucl-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: We investigate the three-body system of $π\bar{K} K^*$ by using the fixed-center approximation to the Faddeev equation, taking the interaction between $π$ and $\bar{K}$, $π$ and $K^*$, and $\bar{K}$ and $K^*$ from the chiral unitary approach. The study is made assuming scattering of a $π$ on a $\bar{K} K^*$ cluster, which is known to generate the $f_1(1285)$ state. The resonant structure around $1650$ MeV shows up in the modulus squared of the $π$-$(\bar{K} K^*)_{f_1(1285)}$ scattering amplitude and suggests that a $π$-$(\bar{K} K^*)_{f_1(1285)}$ state, with "exotic" quantum numbers $J^{PC} = 1^{-+}$, can be formed. This state can be identified as the observed $π_1(1600)$ resonance. We suggest that this is the origin of the present $π_1(1600)$ resonance and propose to look at the $πf_1(1285)$ mode in future experiments to clarify the issue.
description: 6 pages, 5 figures. To match the published version in PRD
Leveraging InfiniBand Controller to Configure Deadlock-Free Routing Engines for Dragonflies
Creators: name: Maglione-Mathey, German
name: Escudero-Sahuquillo, Jesus
name: Garcia, Pedro Javier
name: Quiles, Francisco J.
name: Zahavi, Eitan
Publisher: name: arXiv
Year: 2025
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: Distributed, Parallel, and Cluster Computing (cs.DC)
subject: FOS: Computer and information sciences

description: The Dragonfly topology is currently one of the most popular network topologies in high-performance parallel systems. The interconnection networks of many of these systems are built from components based on the InfiniBand specification. However, due to some constraints in this specification, the available versions of the InfiniBand network controller (OpenSM) do not include routing engines based on some popular deadlock-free routing algorithms proposed theoretically for Dragonflies, such as the one proposed by Kim and Dally based on Virtual-Channel shifting. In this paper we propose a straightforward method to integrate this routing algorithm in OpenSM as a routing engine, explaining in detail the configuration required to support it. We also provide experiment results, obtained both from a real InfiniBand-based cluster and from simulation, to validate the new routing engine and to compare its performance and requirements against other routing engines currently available in OpenSM.
Post-Newtonian-accurate pulsar timing array signals induced by inspiralling eccentric binaries: accuracy, computational cost, and single-pulsar search
Creators: name: Susobhanan, Abhimanyu
Publisher: name: arXiv
Year: 2022
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: Pulsar Timing Array (PTA) experiments are expected to be sensitive to gravitational waves (GWs) emitted by individual supermassive black hole binaries (SMBHBs) inspiralling along eccentric orbits. We compare the computational cost of different methods of computing the PTA signals induced by relativistic eccentric SMBHBs, namely approximate analytic expressions, Fourier series expansion, post-circular expansion, and numerical integration. We show that the fastest method for evaluating PTA signals is by using the approximate analytic expressions, which provides up to ~50 times improvement in computational speed over the alternative methods. We investigate the accuracy of the approximate analytic expressions by employing a mismatch metric valid for PTA signals. We show that this method is accurate within the region of the binary parameter space that is of interest to PTA experiments. We introduce a spline-based method to further accelerate the PTA signal evaluations for narrowband PTA datasets. The efficient methods for computing the eccentric SMBHB-induced PTA signals were implemented in the GWecc.jl package and can be readily accessed from the popular ENTERPRISE package to search for such signals in PTA datasets. Further, we simplify the eccentric SMBHB PTA signal expression for the case of a single-pulsar search and demonstrate our computationally efficient methods by performing a single-pulsar search in the 12.5-year NANOGrav narrowband dataset of PSR J1909-3744 using the simplified expression. These results will be crucial for searching for eccentric SMBHBs in large PTA datasets.
description: Accepted for publication in Classical and Quantum Gravity
Ghost free boson-fermion co-existence system
Creators: name: Kimura, Rampei
name: Sakakihara, Yuki
name: Yamaguchi, Masahide
Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We study co-existence system of both bosonic and fermionic degrees of freedom. For such system with up to first derivatives in Lagrangian, we find Ostrogradsky-type ghost-free condition in Hamiltonian analysis, which is found to be the same with requiring that the equations of motion of fermions are first-order in Lagrangian formulation. When fermionic degrees of freedom are present, uniqueness of time evolution is not guaranteed a priori because of the Grassmann property. We confirm that the additional condition, which is introduced to close Hamiltonian analysis, also ensures the uniqueness of the time evolution of system.
description: 21 pages, v2 : a field theoretical example is added in Appendix, v3: published in PRD
Wie entsteht psychologische Sicherheit und Teamidentifikation? Eine empirische Untersuchung
Creators: name: Bachmann, Thomas
name: Quispe Bravo, Katherina
Publisher: name: Humboldt-Universität zu Berlin
Year: 2021
Subjects: subject: Teamfaktoren
subject: Psychologische Sicherheit
subject: Teamidentifikation
subject: New Work
subject: Agiles Arbeiten
subject: Team characteristics
subject: Psychological safety
subject: Team identification
subject: Agility
subject: 150 Psychologie

description: Die Bedeutung von psychologische Sicherheit und Teamidentifikation sowie die Faktoren für deren Entstehung werden im Kontext von New Work und agilem Arbeiten diskutiert. In einer empirischen Studie wurden Teammitglieder nach Merkmalen ihres Teams, der wahrgenommenen psychologischen Sicherheit und der Identifikation mit dem Team befragt. Die Ergebnisse unterscheiden und identifizieren wesentliche Faktoren zur Beschreibung von Arbeitsteam. Weiterhin konnte ein enger Zusammenhang zwischen psychologischer Sicherheit und Teamidentifikation nachgewiesen werden. Unterschiede zwischen beiden Konstrukten liegen auf der Sozialdimension, die als Prädiktor der Teamidentifikation einen Unterschied zur psychologischen Sicherheit markiert.
KPSI para la evaluacion diagnostica sobre el cancer y la lectura e interpretacion de graficas.
Creators: Issis Yolotzin Alvarado Sánchez
Paulina Cifuentes Ruiz
Publisher: name: HHMI BioInteractive Educator Resource Library
Year: 2023

Instrumento de Instrumento que permite la evaluación diagnóstica en las temáticas de cáncer, la relación entre el la división celular y el riesgo de desarrollar cáncer. Además de la lectura e interpretación de gráficas.
Equilibrium configurations of large nanostructures using the embedded saturated-fragments stochastic density functional theory
Creators: name: Arnon, Eitam
name: Rabani, Eran
name: Neuhauser, Daniel
name: Baer, Roi
Publisher: name: arXiv
Year: 2017
Subjects: subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: An \emph{ab initio} Langevin dynamics approach is developed based on stochastic density functional theory (sDFT) within a new \emph{embedded saturated } \emph{fragment }formalism, applicable to covalently bonded systems. The forces on the nuclei generated by sDFT contain a random component natural to Langevin dynamics and its standard deviation is used to estimate the friction term on each atom by satisfying the fluctuation\textendash dissipation relation. The overall approach scales linearly with system size even if the density matrix is not local and is thus applicable to ordered as well as disordered extended systems. We implement the approach for a series of silicon nanocrystals (NCs) of varying size with a diameter of up to $3$nm corresponding to $N_{e}=3000$ electrons and generate a set of configurations that are distributed canonically at a fixed temperature, ranging from cryogenic to room temperature. We also analyze the structure properties of the NCs and discuss the reconstruction of the surface geometry.
Quantum Error Correction with Metastable States of Trapped Ions Using Erasure Conversion
Creators: name: Kang, Mingyu
name: Campbell, Wesley C.
name: Brown, Kenneth R.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Erasures, or errors with known locations, are a more favorable type of error for quantum error-correcting codes than Pauli errors. Converting physical noise into erasures can significantly improve the performance of quantum error correction. Here we apply the idea of performing erasure conversion by encoding qubits into metastable atomic states, proposed by Wu, Kolkowitz, Puri, and Thompson [Nat. Comm. 13, 4657 (2022)], to trapped ions. We suggest an erasure-conversion scheme for metastable trapped-ion qubits and develop a detailed model of various types of errors. We then compare the logical performance of ground and metastable qubits on the surface code under various physical constraints, and conclude that metastable qubits may outperform ground qubits when the achievable laser power is higher for metastable qubits.
description: 20 pages, 8 figures
VALUABLE Public Summary on feedstock processing and transformation to lipid and chitin products (mid-term)
Creators: name: Ringel, Marion
name: Lorenzen, Jan
Publisher: name: Zenodo
Year: 2024

description: (Draft deliverable; not yet approved by the European Commission)

The 57 deliverables in the VALUABLE project are either declared as public or sensitive. The public deliverables are directly uploaded to the EU portal and the Zenodo platform to allow full access to the documents by the public. Due to IP reasons and the connected aim to commercialise the VALUABLE process at the end of the project time, some of the deliverables are sensitive and not available for the public. To give at least a short insight into the work carried out in the sensitive deliverables, the deliverable D 7.15 summarises this work for the public without any sensitive data. As it is currently not clear what data will be part of the project IP this deliverable only includes brief summaries of the sensitive deliverables. To the current status of the project, all results are very encouraging thus allowing for a promising prospect of the second project reporting period.
Three-dimensional hydrodynamical CO5BOLD model atmospheres of red giant stars VI. First chromosphere model of a late-type giant
Creators: name: Wedemeyer, Sven
name: Kucinskas, Arunas
name: Klevas, Jonas
name: Ludwig, Hans-Gunter
Publisher: name: arXiv
Year: 2017
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Although observational data unequivocally point out to the presence of chromospheres in red giant stars, no attempts have been made so far to model them using 3D hydrodynamical model atmospheres. We therefore compute an exploratory 3D hydrodynamical model atmosphere for a cool red giant in order to study the dynamical and thermodynamic properties of its chromosphere, as well as the influence of the chromosphere on its observable properties. 3D radiation hydrodynamics simulations are carried out with the CO5BOLD model atmosphere code for a star with the atmospheric parameters (Teff=4010 K, log g=1.5, [M/H]=0.0), which are similar to those of the K-type giant star Aldebaran (alpha Tau). ... we compute the emergent continuum intensity maps at different wavelengths, spectral line profiles of Ca II K, the Ca II infrared triplet line at 854.2nm, and H alpha, as well as the spectral energy distribution (SED) of the emergent radiative flux. The initial model quickly develops a dynamical chromosphere characterised by propagating and interacting shock waves. The peak temperatures in the chromospheric shock fronts reach values on the order of up to 5000 K although the shock fronts remain quite narrow. Like for the Sun, the gas temperature distribution in the upper layers is composed of a cool component due to adiabatic cooling in the expanding post-shock regions and a hot component due to shock waves. For this red giant model, the hot component is a rather flat high-temperature tail, which nevertheless affects the resulting average temperatures significantly. The simulations show that the atmospheres of red giant stars are dynamic and intermittent. Consequently, many observable properties cannot be reproduced with one-dimensional static models but demand for advanced 3D HD modelling. Furthermore, including a chromosphere in the models might produce significant contributions to the emergent UV flux.
description: 14 pages, 8 figures, A&A (2017, accepted)
Constraints on the Higgs boson self-coupling from single- and double-Higgs production with the ATLAS detector using $pp$ collisions at $\sqrt{s}=13$ TeV
Creators: name: ATLAS Collaboration
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Constraints on the Higgs boson self-coupling are set by combining double-Higgs boson analyses in the $b\bar{b}b\bar{b}$, $b\bar{b}τ^+τ^-$ and $b\bar{b} γγ$ decay channels with single-Higgs boson analyses targeting the $γγ$, $ZZ^*$, $WW^*$, $τ^+ τ^-$ and $b\bar{b}$ decay channels. The data used in these analyses were recorded by the ATLAS detector at the LHC in proton$-$proton collisions at $\sqrt{s}=13$ TeV and correspond to an integrated luminosity of 126$-$139 fb$^{-1}$. The combination of the double-Higgs analyses sets an upper limit of $μ_{HH} < 2.4$ at 95% confidence level on the double-Higgs production cross-section normalised to its Standard Model prediction. Combining the single-Higgs and double-Higgs analyses, with the assumption that new physics affects only the Higgs boson self-coupling ($λ_{HHH}$), values outside the interval $-0.4< κ_λ=(λ_{HHH}/λ_{HHH}^{\textrm{SM}})< 6.3$ are excluded at 95% confidence level. The combined single-Higgs and double-Higgs analyses provide results with fewer assumptions, by adding in the fit more coupling modifiers introduced to account for the Higgs boson interactions with the other Standard Model particles. In this relaxed scenario, the constraint becomes $-1.4 < κ_λ < 6.1$ at 95% CL.
description: 17 pages in total, author list starting page 1, 6 figures, 2 tables, submitted to Phys. Lett. B. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HDBS-2022-03