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Semi-Markov Telecommunication Networks Model

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Semi-Markov Telecommunication Networks Model

International Conference on Actual Problems of Electron Devices Engineering, (APEDE)

作者： Mikhail S. Svetlov Alexey A. L’vov Arman M. Martirosyan David M. Martirosyan Igor S. Bagaev Semen T. Khasanov Laboratory of Control and Automation Problems in Mechanical Engineering Institute of Precision Mechanics and Control of RAS Saratov Russian Federation Institute of Institute of Electronic Engineering and Instrumentation Yuri Gagarin State Technical University of Saratov Saratov Russian Federation Institute of Applied Information Technologies and Communications Yuri Gagarin State Technical University of Saratov Saratov Russian Federation Phystech-School of Applied Mathematics and Computer Science Moscow Institute of Physics and Technology Moscow Russian Federation

ISBN: (数字)9798350393316

ISBN: (纸本)9798350393323

This paper proposes a semi-Markov model of telecommunication network (TCN). The variant of dynamic traffic adaptive control of queuing system as a special case of TCN is considered. The main purpose of control is to minimize the average cost per unit of time to service the incoming flow of information (packets). This takes into account the different bandwidth of the channels, the processing speed of information in the channel and the information capacity of the buffers. The approach to the organization of dynamic control taking into account noise immunity (information reliability) and information security is discussed.

关键词： Adaptation models Costs Noise Information security Bandwidth Organizations Communications technology Telecommunication network reliability Adaptive control Electron devices

Transport characteristics of a PT-symmetric non-Hermitian system: Effect of environmental interaction

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arXiv 2022年

作者： Ganguly, Sudin Roy, Souvik Maiti, Santanu K. Department of Physics School of Applied Sciences University of Science and Technology Meghalaya Ri-Bhoi793 101 India Physics and Applied Mathematics Unit Indian Statistical Institute 203 Barrackpore Trunk Road Kolkata700 108 India

The environmental influence is inevitable but often ignored in the study of electronic transport properties of small-scale systems. Such an environment-mediated interaction can generally be described by a parity-time symmetric non-Hermitian system with a balanced distribution of physical gain and loss. It is quite known in the literature that along with the conventional junction current, another current called bias-driven circular current can be established in a loop geometry depending upon the junction configuration. This current, further, induces a strong magnetic field that can even reach to few Tesla. What will happen to these quantities when the system interacts with its surrounding environment? Would it exhibit a detrimental response? We address such issues considering a two-terminal ring geometry where the junction setup is described within a tight-binding framework. All the transport quantities are evaluated using the standard Green's function formalism based on the Landauer-Büttiker approach. © 2022, CC BY.

关键词： Geometry

Transition energies and oscillator strengths for the intrashell and intershell transitions of the C-like ions in a thermodynamic equilibrium plasma environment

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Physical Review E 2022年第1期105卷 015206-015206页

作者： Chensheng Wu Yong Wu Jun Yan T. N. Chang Xiang Gao Institute for Applied Physics and Computational Mathematics Beijing 100088 China Beijing Computational Science Research Center Beijing 100193 China Department of Physics University of Southern California Los Angeles California 90089-0484 USA Institute for Theoretical Physics Vienna University of Technology A-1040 Vienna Austria

We present a theoretical study of the transition energies ω and the oscillator strengths gf for the C-like ions (with Z from 14–36) subject to plasma environment for atomic transitions, which meet the spatial and temporal criteria of the Debye-Hückel (DH) approximation. Two strong dipole-allowed transitions, viz., the intrashell transition 2s2p33D1→2s22p23P0, and the intershell transition 2s22p3d3D1→2s22p23P0 are investigated in detail. We found that both ω and gf increase for the intrashell transition under the Debye-Hückel screening potential VDH in terms of the Debye length D, which is linked to the ratio between the plasma density Ne and its temperature kT. In contrast, both ω and gf decrease for the intershell transition. Our theoretically estimated data have led to a general scaling feature for the change in ω of both intershell and intrashell transitions for ions with different nuclear charge Z. A similar general feature for the change in gf is also found for the intrashell transition. However, due to the change of the electron correlations between electrons in different shells with respect to the relativistic spin-orbit interaction as Z varies, the variation of gf subject to the surrounding plasma is more complicated for the intershell transition. The results presented in this work may facilitate the plasma diagnostic to determine the plasma temperature and density for the astrophysical objects and the controlled fusion facilities.

关键词： Atomic & molecular processes in external fields Atomic & molecular structure Plasma-particle interactions

Constructive Holography

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arXiv 2024年

作者： De Mello Koch, Robert Van Zyla, Hendrik J.R. School of Science Huzhou University Huzhou313000 China School of Physics and Mandelstam Institute for Theoretical Physics University of the Witwatersrand Wits2050 South Africa The Laboratory for Quantum Gravity & Strings Department of Mathematics & Applied Mathematics University of Cape Town Cape Town South Africa The National Institute for Theoretical and Computational Sciences Private Bag X1 Matieland South Africa

We consider the collective field theory description of the singlet sector of a free and massless matrix field in d dimensions. The k-local collective fields are functions of (d - 1)k + 1 coordinates. We provide a map between the collective fields and fields in the dual gravitational theory defined on AdSd+1 spacetime. The coordinates of the collective field have a natural interpretation: the k-local collective field is a field defined on an AdSd+1×Sk-1×S(d-2)(k-2)×Sd-3spacetime. The modes of a harmonic expansion on the Sk-1×S(d-2)(k-2)×Sd-3 portion of the spacetime leads to the spinning bulk fields of the dual gravity theory. Copyright © 2024, The Authors. All rights reserved.

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Degradation of the Magnetocaloric Effect in Fe48Rh52 Alloys under Cyclic Magnetic Field

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Bulletin of the Russian Academy of sciences: physics 2024年第SUPPL 2期88卷 S269-S274页

作者： Amirov, A.A. Chirkova, A.M. Volegov, A.S. Komlev, A.S. Baranov, N.V. Aliev, A.M. National University of Science and Technology MISiS Moscow119049 Russia Hochschule Bielefeld University of Applied Sciences and Arts Bielefeld33619 Germany Institute of Natural Sciences and Mathematics Ural Federal University Yekaterinburg620002 Russia Institute of Metal Physics Yekaterinburg620083 Russia Department of Physics Moscow State University Moscow119991 Russia Amirkhanov Institute of Physics Daghestan Federal Research Center Russian Academy of Sciences Makhachkala367003 Russia

Abstract: The direct measurements of the adiabatic temperature change under cyclic conditions have been carried out for Fe48Rh52 alloys obtained by different heat treatment protocols. Furthermore, the magnetocaloric long-term performance has been estimated. The results demonstrate that the degradation of the magnetocaloric properties observed in FeRh can depend on the microstructure of the alloys. Besides, the selection of the cycling temperature can affect the performance as well. The magnetic measurements carried out after the cyclic experiment revealed a shift of the transition towards lower temperatures, which can be correlated to the possible stress that was accumulated during the repetitive magnetostructural transition. Then, it has been shown that the degraded material can be healed by a low temperature annealing those results in the recovery of the magnetostructural transition. The outcome can give a hint for the efficient design of magnetocaloric alloys and the selection of the working temperature in order to diminish the degradation effects. © Pleiades Publishing, Ltd. 2024.

关键词： Magnetocaloric effects

Reconstructing the spacetime dual to a free matrix

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arXiv 2024年

作者： de Mello Koch, Robert Roy, Pratik Van Zyl, Hendrik J.R. School of Science Huzhou University Huzhou313000 China School of Physics and Mandelstam Institute for Theoretical Physics University of the Witwatersrand Wits2050 South Africa The Laboratory for Quantum Gravity & Strings Department of Mathematics & Applied Mathematics University of Cape Town Cape Town South Africa The National Institute for Theoretical and Computational Sciences Private Bag X1 Matieland South Africa

In this paper we consider the collective field theory description of the singlet sector of a free matrix field in 2+1 dimensions. This necessarily involves the study of k-local collective fields, which are functions of 2k + 1 coordinates. We argue that these coordinates have a natural interpretation: the k-local collective field is a field defined on an AdS4×Sk−2×Sk−1 spacetime. The modes of a harmonic expansion on the Sk−2×Sk−1 portion of the spacetime leads to the spinning bulk fields of the dual gravity theory. Copyright © 2024, The Authors. All rights reserved.

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Non-Zero Mode Higher-Order Topological States in T-Graphene Lattice

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SSRN

SSRN 2024年

作者： Yan, Liang Wang, Zhigang Yan, Jie-Yun School of Science Beijing University of Posts and Telecommunications Beijing100876 China Institute of Applied Physics and Computational Mathematics Beijing100088 China State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Beijing100876 China

Higher-order topological states extend the power of nontrivial topological states beyond the bulk-edge correspondence. Here we study the higher-order topological states (corner states) in an open-boundary two-dimensional T-graphene lattice. Unlike the common zero-energy corner states, our findings reveal that there exist non-zero energy corner states in such lattice systems, and the energy could be controlled by modifying the hopping parameters. Moreover, the corner states could be transferred away from the lattice corners by designing the position-specific vacancy defects. The strong robustness of the corner states is also demonstrated against the uniaxial strain and vacancy defects, respectively. To testify to the theory, a plasmonic crystal is constructed, in which the corner states are realized in optical modes and their higher-order topological properties are verified. Our results open the avenue of corner-states engineering, which holds significant physical implications of higher-order topological states for the design of photonic and electronic devices with specialized functionalities. © 2024, The Authors. All rights reserved.

关键词： Topology

Breaking Down Financial News Impact: A Novel AI Approach with Geometric Hypergraphs 3

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Breaking Down Financial News Impact: A Novel AI Approach wit...

3rd International Workshop on Natural Language Processing for Knowledge Graph Creation, NLP4KGC 2024

作者： Harit, Anoushka Sun, Zhongtian Yu, Jongmin Al Moubayed, Noura Department of Computer Science Durham University Stockton Rd DurhamDH1 3LE United Kingdom Cancer Research UK Cambridge Institute University of Cambridge Li Ka Shing Centre Robinson Way CambridgeCB2 0RE United Kingdom Department of Applied Mathematics and Theoretical Physics University of Cambridge Wilberforce Rd CambridgeCB3 0WA United Kingdom

In the fast-paced and volatile financial markets, accurately predicting stock movements based on financial news is critical for investors and analysts. Traditional models often struggle to capture the intricate and dynamic relationships between news events and market reactions, limiting their ability to provide actionable insights. This paper introduces a novel approach leveraging Explainable Artificial Intelligence (XAI) through the development of a Geometric Hypergraph Attention Network (GHAN) to analyze the impact of financial news on market behaviours. Geometric hypergraphs extend traditional graph structures by allowing edges to connect multiple nodes, effectively modelling high-order relationships and interactions among financial entities and news events. This unique capability enables the capture of complex dependencies, such as the simultaneous impact of a single news event on multiple stocks or sectors, which traditional models frequently overlook. By incorporating attention mechanisms within hypergraphs, GHAN enhances the model's ability to focus on the most relevant information, ensuring more accurate predictions and better interpretability. Additionally, we employ BERT-based embeddings to capture the semantic richness of financial news texts, providing a nuanced understanding of the content. Using a comprehensive financial news dataset, our GHAN model addresses key challenges in financial news impact analysis, including the complexity of high-order interactions, the necessity for model interpretability, and the dynamic nature of financial markets. Integrating attention mechanisms and SHAP values within GHAN ensures transparency, highlighting the most influential factors driving market predictions. Empirical validation demonstrates the superior effectiveness of our approach over traditional sentiment analysis and time-series models. Our framework not only improves prediction accuracy but also provides detailed insights into how financial news impacts diff

关键词： Financial markets

Holography of a single free matrix

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arXiv 2024年

In this paper we consider the collective field theory description of a single free massless scalar matrix theory in 2+1 dimensions. The collective fields are given by k-local operators obtained by tracing a product of k-matrices. For k = 2 and k = 3 we argue that the collective field packages the fields associated to a single and two Regge trajectories respectively. We also determine the coordinate transformation between the coordinates of the collective field theory and the bulk AdS space time. This is used to verify that the bulk equations of motion holds in the collective field theory description. Copyright © 2024, The Authors. All rights reserved.

关键词： Equations of motion