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Multifractal Hopscotch in Hopscotch by Julio Cortázar

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arXiv 2025年

作者： Dec, Jakub Dolina, Michal Drozdz, Stanislaw Kwapien, Jaroslaw Stanisz, Tomasz Faculty of Computer Science and Telecommunications Cracow University of Technology Kraków31-155 Poland Complex Systems Theory Department Institute of Nuclear Physics Polish Academy of Sciences Kraków31-342 Poland

Punctuation is the main factor introducing correlations in natural language written texts and it crucially impacts their overall effectiveness, expressiveness, and readability. Punctuation marks at the end of sentences are of particular importance as their distribution can determine various complexity features of written natural language. Here, the sentence length variability (SLV) time series representing Hopscotch by Julio Cortázar are subjected to quantitative analysis with an attempt to identify their distribution type, long-memory effects, and potential multiscale patterns. The analyzed novel is an important and innovative piece of literature whose essential property is freedom of movement between its building blocks given to a reader by the author. The statistical consequences of this freedom are closely investigated in both the original, Spanish version of the novel, and its translations into English and Polish. Clear evidence of rich multifractality in the SLV dynamics, with a left-sided asymmetry, however, is observed in all three language versions as well as in the versions with differently ordered chapters. Copyright © 2025, The Authors. All rights reserved.

关键词： Weibull distribution

Linear High-Gain Correction Observer in Nonlinear Control 20th

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Linear High-Gain Correction Observer in Nonlinear Control

20th Polish Control Conference, PCC 2020

作者： Latocha, Andrzej Faculty of Electrical Engineering Automatics Computer Science and Biomedical Engineering AGH University of Science and Technology Kraków Poland

ISBN: (纸本)9783030509354

The development of innovation technology requires one to provide control processes with better quality indexes. In modern control theory, the algorithms for calculating linear-quadratic regulator (LQR) for linear dynamic systems are known. The classical LQR algorithms do not take into account transport delays of the signals or uncertainty of measured values and models, which causes the task of stabilizing physical systems by classical LQR algorithm to contain significant errors which decrease quality indexes. Most control systems are non-linear, not isolated from the uncertainty of measured values and models. For this reason, in the paper the possibility of calculating a linear-quadratic regulator for non-linear systems, which will provide stability in a wider environment around the reference point for additive noise based on the high-gain disturbance correction observer, are proposed. © 2020, Springer Nature Switzerland AG.

关键词： Additive noise

Paired electron motion in interacting chains of quantum dots

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Physical Review B 2020年第7期101卷 075306-075306页

作者： Bartłomiej Szafran AGH University of Science and Technology Faculty of Physics and Applied Computer Science aleja Mickiewicza 30 30-059 Kraków Poland

We study the motion of a pair of electrons along two separate parallel chains of quantum dots. The electrons that are released from the central dot of each chain tend to accompany and not avoid each other. The correlated electron motion involves entanglement of the wave functions which is generated in time upon release of the initial confinement. Observation of the simultaneous presence of electrons at the same side of the chain can provide a fingerprint of the paired electron motion.

关键词： Electron correlation calculations for atoms & ions Electron relaxation Entanglement entropy Entanglement production Pairing mechanisms Double quantum dots Quantum dots

Nonlocal Temporal Interferometry for Highly Resilient Free-Space Quantum Communication

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Physical Review X 2023年第2期13卷 021001-021001页

作者： Lukas Bulla Matej Pivoluska Kristian Hjorth Oskar Kohout Jan Lang Sebastian Ecker Sebastian P. Neumann Julius Bittermann Robert Kindler Marcus Huber Martin Bohmann Rupert Ursin Institute for Quantum Optics and Quantum Information (IQOQI) Austrian Academy of Sciences Boltzmanngasse 3 1090 Vienna Austria Vienna Center for Quantum Science and Technology (VCQ) Faculty of Physics University of Vienna Boltzmanngasse 5 1090 Vienna Austria Institute of Computer Science Masaryk University 602 00 Brno Czech Republic Institute of Physics Slovak Academy of Sciences 845 11 Bratislava Slovakia Department of Physics Faculty of Natural Sciences Norwegian University of Science and Technology (NTNU) NO-7491 Trondheim Norway Fraunhofer Institute for Applied Optics and Precision Engineering IOF Albert-Einstein-Strasse 7 07745 Jena Germany Friedrich-Schiller-Universitt Jena FSU Frstengraben 1 07743 Jena Germany Vienna Center for Quantum Science and Technology (VCQ) Atominstitut Technische Universität Wien Stadionallee 2 1020 Vienna Austria

Entanglement distribution via photons over long distances enables many applications, including quantum key distribution, which provides unprecedented privacy. The inevitable degradation of entanglement through noise accumulated over long distances remains one of the key challenges in this area. Exploiting the potential of higher-dimensional entangled photons promises to address this challenge, but poses extreme demands on the experimental implementation. Here, we present a long-range free-space quantum link, distributing entanglement over 10.2 km with flexible dimensionality of encoding by deploying a phase-stable nonlocal Franson interferometer. With this distribution of multidimensional energy-time entangled photons, we analyze the achievable key rate in a dimensionally adaptive quantum key distribution protocol that can be optimized with respect to any environmental noise conditions. Our approach enables and emphasizes the power of high-dimensional entanglement for quantum communication, yielding a positive asymptotic key rate well into the dawn of the day.

关键词： Quantum channels Quantum communication Quantum cryptography Quantum entanglement Quantum information theory Quantum networks

Design and Implementation of Multiphase Digital Oscillator

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Design and Implementation of Multiphase Digital Oscillator

International Conference on Electrical Engineering/Electronics, computer, Telecommunications and Information technology, ECTI-CON

作者： Thitaphan Jongsataporn Poonna Yospanya Sorawat Chivapreecha Department of Industrial Physics and Medical Instrumentation Faculty of Applied Science King Mongkut's University of Technology North Bangkok Bangkok Thailand Department of Telecommunication Engineering School of Engineering King Mongkut's Institute of Technology Ladkrabang Bangkok Thailand

ISBN: (数字)9798350381559

ISBN: (纸本)9798350381566

This paper presents a design and implementation of the multiphase digital oscillator, which can determine the initial phase of multi-output signals to desired initial phases. The proposed system consists of biquad digital oscillator to oscillate the reference signal, and the new phase shifters which are first order IIR filters that can shift the phase of signals at a specified frequency to give them the desired phases. Design example and simulation results will be shown. Moreover, real-time hardware implementation on STM32 digital signal processor can be demonstrated to confirm the proposed design can work with hardware experimental results.

关键词： Simulation Phase shifters Digital signal processors IIR filters Information filters Hardware Real-time systems

In Situ Formed Bimetal Metal-Organic Frameworks in Polyvinyl Alcohol/Sodium Alginate-Based Conductive Hydrogels Towards Soft Electronics

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SSRN

SSRN 2024年

作者： Li, Jiongru Wei, Huige Cui, Shuaichuan Hou, Hua Zhang, Yifan Zhang, Yingying Xu, Ben Bin El-Bahy, Zeinhom M. Melhi, Saad Sellami, Rahma Guo, Zhanhu Tianjin Key Laboratory of Brine Chemical Engineering and Resource Eco-utilization College of Chemical Engineering and Materials Science Tianjin University of Science and Technology Tianjin300457 China State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun130022 China College of Materials Science and Engineering Taiyuan University of Science and Technology Taiyuan030024 China Tianjin University of Science and Technology China Department of Mechanical and Construction Engineering Northumbria University Newcastle Upon TyneNE1 8ST United Kingdom Department of Chemistry Faculty of Science Al-Azhar University Nasr City Cairo11884 Egypt Department of Computer Science Applied College Northern Border University Rafha91911 Saudi Arabia University of Bisha Saudi Arabia

Zeolitic imidazolate frameworks (ZIFs) have received enormous attention due to unique physi-chemical properties, but are rarely reported for applications in electrically conductive hydrogels (ECHs) arising from low intrinsic conductivity and poor dispersion. Herein, we propose an innovative strategy to prepare highly conductive and mechanically robust ECHs by in situ growing Ni/Co bimetallic ZIFs within the polyvinyl alcohol/sodium alginate dual network. 2-methylimidazole (MeIM) ligands are creatively copolymerized with pyrrole monomers to form Py-co-MeIM conductive fillers and improve the conjugation degree of the polymer chains and thereby increase the conductivity of the hydrogel. Meanwhile, MeIM ligands act as anchor points for the in-situ formation of bimetallic ZIFs by trapping targeted metal ions, effectively avoiding phase-to-phase interfacial resistance and ensuring a uniform distribution in the hydrogel network. Due to the synergism of Ni/Co bimetallic ZIFs, the PZPS hydrogel exhibits a high areal capacitance, promising for flexible energy storage devices. In addition, the hydrogel shows excellent mechanical strength and toughness, a high gauge factor and a pressure sensitivity over an extremely wide stress range when used as flexible wearable strain/pressure sensors. This study provides new insights to incorporating highly conductive and uniformly dispersed ZIFs into hydrogels for flexible wearable electronics. © 2024, The Authors. All rights reserved.

关键词： Hydrogels

High thermoelectric power factor through topological flat bands

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arXiv 2024年

作者： Garmroudi, Fabian Serhiienko, Illia Di Cataldo, Simone Parzer, Michael Riss, Alexander Grasser, Matthias Stockinger, Simon Khmelevskyi, Sergii Pryga, Kacper Wiendlocha, Bartlomiej Held, Karsten Mori, Takao Bauer, Ernst Pustogow, Andrej Institute of Solid State Physics TU Wien Vienna1040 Austria National Institute for Materials Science Tsukuba305-0044 Japan University of Tsukuba Tsukuba305-8577 Japan Dipartimento di Fisica Sapienza University of Rome Piazzale Aldo Moro 5 Roma00185 Italy Vienna Scientific Cluster Research Center TU Wien Vienna1040 Austria AGH University of Krakow Faculty of Physics and Applied Computer Science Aleja Mickiewicza 30 Krakow30-059 Poland

Thermoelectric (TE) materials are useful for applications such as waste heat harvesting or efficient and targeted cooling. While various strategies towards superior thermoelectrics through a reduction of the lattice thermal conductivity have been developed, a path to enhance the power factor is pressing. Here, we report large power factors up to 5 mW m−1 K−2 at room temperature in the kagome metal Ni3In1 – x Snx . This system is predicted to feature almost dispersionless flat bands in conjunction with highly dispersive Dirac-like bands in its electronic structure around the Fermi energy EF [L. Ye et al., Nature physics (2024)]. Within this study, we experimentally and theoretically showcase that tuning this flat band precisely below EF by chemical doping x boosts the Seebeck coefficient and power factor, as highly mobile charge carriers scatter into the flat-band states. Our work demonstrates the prospect of engineering extremely flat and highly dispersive bands towards the Fermi energy in kagome metals and introduces topological flat bands as a novel tuning knob for thermoelectrics. Copyright © 2024, The Authors. All rights reserved.

关键词： Fermi level

FEASIBILITY STUDIES OF DARK PHOTON SEARCHES WITH THE J-PET DETECTOR

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arXiv 2024年

作者： Mȩdrala-Sowa, Justyna del Rio, Elena Perez Krzemień, Wojciech Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University Kraków30-348 Poland Centre for Theranostics Jagiellonian University Kraków31-501 Poland High Energy Physics Division National Centre for Nuclear Research Swierk Otwock05-400 Poland

The positronium, a bound state of electron and positron is a unique system to perform highly precise tests, due to no hadronic background and precise Quantum Electrodynamics (QED) predictions. Being a system of lepton and antilepton, its properties are precisely described by QED in the Standard Model (SM). The final events topology can be simulated using Monte Carlo techniques. The J-PET detector is a multi-purpose, large acceptance system that is very well-suitable to the studies of positronium decay due to its excellent angular (1o) and timing resolutions. We present preliminary results on the feasibility of searching for Dark Matter (DM) candidates in the decay o-Ps → invisible with the J-PET, which is well suited for the detection of positronium decay products. Toy Monte Carlo simulations have been prepared to incorporate DM decay models to the o-Ps decay expectations in order to assess the detector capabilities to search for such an elusive component of our Universe. © 2024, CC BY.

关键词： Positrons

Quantum analog of Landau-Lifshitz-Gilbert dynamics

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arXiv 2024年

作者： Liu, Yuefei Miranda, Ivan P. Johnson, Lee Bergman, Anders Delin, Anna Thonig, Danny Pereiro, Manuel Eriksson, Olle Azimi-Mousolou, Vahid Sjöqvist, Erik Department of Applied Physics School of Engineering Sciences KTH Royal Institute of Technology AlbaNova University Center StockholmSE-10691 Sweden Department of Physics and Astronomy Uppsala University Box 516 UppsalaSE-751 20 Sweden Department of Physics and Electrical Engineering Linnaeus University KalmarSE-39231 Sweden KTH Royal Institute of Technology StockholmSE-10044 Sweden KTH Royal Institute of Technology StockholmSE-10044 Sweden School of Science and Technology Örebro University ÖrebroSE-701 82 Sweden WISE-Wallenberg Initiative Materials Science Uppsala University Box 516 UppsalaSE-751 20 Sweden Department of Applied Mathematics and Computer Science Faculty of Mathematics and Statistics University of Isfahan Isfahan81746-73441 Iran

The Landau-Lifshitz-Gilbert (LLG) and Landau-Lifshitz (LL) equations play an essential role for describing the dynamics of magnetization in solids. While a quantum analog of the LL dynamics has been proposed in [Phys. Rev. Lett. 110, 147201 (2013)], the corresponding quantum version of LLG remains unknown. Here, we propose such a quantum LLG equation that inherently conserves purity of the quantum state. We examine the quantum LLG dynamics of a dimer consisting of two interacting spin- 12 particles. Our analysis reveals that, in the case of ferromagnetic coupling, the evolution of initially uncorrelated spins mirrors the classical LLG dynamics. However, in the antiferromagnetic scenario, we observe pronounced deviations from classical behavior, underscoring the unique dynamics of becoming a spinless state, which is non-locally correlated. Moreover, when considering spins that are initially entangled, our study uncovers an unusual form of revival-type quantum correlation dynamics, which differs significantly from what is typically seen in open quantum systems. Copyright © 2024, The Authors. All rights reserved.

关键词： Quantum entanglement