检索结果-内蒙古大学图书馆

International Conf on Electrical and Electronic Engineering (ICEEE)

作者： Bogdan Smolka Monika Mendrela Damian Kusnik Milena Smolka Faculty of Automatics Electronics and Informatics Silesian University of Technology Gliwice Poland Faculty of Electrical Engineering Automatics Computer Science and Biomedical Engineering AGH University of Science and Technology Krakow Poland

This paper describes a new technique for removing impulsive noise in digital color images. The proposed method uses a measure of the pixel distortion caused by the impulsive noise, expressed as the sum of the Euclidean distances between the central pixel and its closest neighbors in the filtering window. This corruption measure is used to determine a weighted average of the pixels from the local neighborhood that is not affected by the distorted pixels. The filtering output is obtained using a soft switching scheme, where the denoising result is determined as a weighted average of the central pixel of a processing window and its robust estimate. The weighting coefficient is calculated based on the amount of distortion of the central pixel. Thus, if the central pixel is highly distorted, it is replaced by its robust estimate, otherwise it is not significantly changed. The parameters that determine the image enhancement result are adaptively adjusted by using a noise-resistant image contrast measure. The proposed filter design is able to effectively suppress impulsive noise while preserving fine image details and edges. Comparison with existing algorithms shows that the proposed method provides better denoising results than the most efficient filters designed for impulsive noise suppression in color images. Moreover, the new method is very fast and can be used in real-time denoising scenarios.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Microsoft cloud-based digitization workflow with rich metadata acquisition for cultural heritage objects

arXiv

引用

arXiv 2024年

作者： Kutt, Krzysztof Gomulka, Jakub do Valle Miranda, Luiz Nalepa, Grzegorz J. Jagiellonian Human-Centered AI Lab Mark Kac Center for Complex Systems Research Institute of Applied Computer Science Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University prof. Stanislawa Lojasiewicza 11 Kraków30-348 Poland Faculty of Humanities AGH University of Krakow Czarnowiejska 36 Kraków30-054 Poland

In response to several cultural heritage initiatives at the Jagiellonian university, we have developed a new digitization workflow in collaboration with the Jagiellonian Library (JL). The solution is based on easy-to-access technological solutions—Microsoft 365 cloud with MS Excel files as metadata acquisition interfaces, Office Script for validation, and MS Sharepoint for storage—that allows metadata acquisition by domain experts (philologists, historians, philosophers, librarians, archivists, curators, etc.) regardless of their experience with information systems. The ultimate goal is to create a knowledge graph that describes the analyzed holdings, linked to general knowledge bases, as well as to other cultural heritage collections, so careful attention is paid to the high accuracy of metadata and proper links to external sources. The workflow has already been evaluated in two pilots in the DiHeLib project focused on digitizing the so-called "Berlin Collection" and in two workshops with international guests, which allowed for its refinement and confirmation of its correctness and usability for JL. As the proposed workflow does not interfere with existing systems or domain guidelines regarding digitization and basic metadata collection in a given institution (e.g., file type, image quality, use of Dublin Core/MARC-21), but extends them in order to enable rich metadata collection, not previously possible, we believe that it could be of interest to all GLAMs (galleries, libraries, archives, and museums). Copyright © 2024, The Authors. All rights reserved.

关键词： Philosophical aspects

来源：评论

学校读者我要写书评

暂无评论

Recognizing H-Graphs – Beyond Circular-Arc Graphs 48

Recognizing H-Graphs – Beyond Circular-Arc Graphs

引用

48th International Symposium on Mathematical Foundations of computer science, MFCS 2023

作者： Çağırıcı, Deniz Ağaoğlu Çağırıcı, Onur Derbisz, Jan Hartmann, Tim A. Hliněný, Petr Kratochvíl, Jan Krawczyk, Tomasz Zeman, Peter Faculty of Informatics Masaryk University Brno Czech Republic Toronto Metropolitan University Canada Theoretical Computer Science Department Faculty of Mathematics and Computer Science Jagiellonian University Kraków Poland CISPA Helmholtz Center for Information Security Saarbrücken Germany Doctoral School of Exact and Natural Sciences Jagiellonian University Kraków Poland Department of Applied Mathematics Faculty of Mathematics and Physics Charles University Prague Czech Republic Technical University of Denmark Lyngby Denmark

ISBN: (纸本)9783959772921

In 1992 Biró, Hujter and Tuza introduced, for every fixed connected graph H, the class of H-graphs, defined as the intersection graphs of connected subgraphs of some subdivision of H. Such classes of graphs are related to many known graph classes: for example, K2-graphs coincide with interval graphs, K3-graphs with circular-arc graphs, the union of T-graphs, where T ranges over all trees, coincides with chordal graphs. Recently, quite a lot of research has been devoted to understanding the tractability border for various computational problems, such as recognition or isomorphism testing, in classes of H-graphs for different graphs H. In this work we undertake this research topic, focusing on the recognition problem. Chaplick, Töpfer, Voborník, and Zeman showed an XP-algorithm testing whether a given graph is a T-graph, where the parameter is the size of the tree T. In particular, for every fixed tree T the recognition of T-graphs can be solved in polynomial time. Tucker showed a polynomial time algorithm recognizing K3-graphs (circular-arc graphs). On the other hand, Chaplick et al. showed also that for every fixed graph H containing two distinct cycles sharing an edge, the recognition of H-graphs is NP-hard. The main two results of this work narrow the gap between the NP-hard and P cases of H-graph recognition. First, we show that the recognition of H-graphs is NP-hard when H contains two distinct cycles. On the other hand, we show a polynomial-time algorithm recognizing L-graphs, where L is a graph containing a cycle and an edge attached to it (which we call lollipop graphs). Our work leaves open the recognition problems of M-graphs for every unicyclic graph M different from a cycle and a lollipop. © Deniz Ağaoğlu Çağırıcı, Onur Çağırıcı, Jan Derbisz, Tim A. Hartmann, Petr Hliněný, Jan.

关键词： Trees (mathematics)

来源：评论

学校读者我要写书评

暂无评论

Luminescent Properties of Opal–Active Dielectric Matrix Nanocomposites Activated by Ions of Rare-Earth Elements 9th

Luminescent Properties of Opal–Active Dielectric Matrix Nan...

引用

9th International Research and Practice Conference on Nanotechnology and Nanomaterials, NANO 2021

作者： Ohiienko, O.V. Moiseyenko, V.N. Holochalov, D.O. Shvets, T.V. Abu Sal, B. Physics Electronics and Computer Systems Department Oles Honchar Dnipro National University Prospect Gagarina 72 Dnipro49010 Ukraine Applied Physics Department Faculty of Science Tafila Technical University Al-Eis P.O. Box 40 Tafila66141 Jordan

ISBN: (纸本)9783031181030

The results of the influence of the coordination and nanocrystalline environment, as well as the position of the stopband, on the luminescence of rare-earth ions (Eu3+ and Dy3+) in the pores of synthetic opal and nanocomposites based on opals and active dielectrics are presented. Luminescence spectra of europium (III) acetate salt, europium oxide, and dysprosium oxide in the pores of opal, as well as nanocomposites opal-Bi12SiO20, opal-Bi2TeO5, opal-NaBi(MoO4)2, and opal-TeO2 were measured. A significant increase in the integrated luminescence intensity of Eu3+ ions in the pores of the opal-Bi12SiO20 nanocomposite was revealed. © 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Nanocomposites

来源：评论

学校读者我要写书评

暂无评论

Nagaoka spin-valley ordering in silicene quantum dots

引用

Physical Review B 2021年第12期103卷 125306-125306页

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

We study a cluster of quantum dots defined within silicene that hosts confined electron states with spin and valley degrees of freedom. Atomistic tight-binding and continuum Dirac approximations are applied for a few-electron system in the quest for spontaneous valley polarization driven by interdot tunneling and an electron-electron interaction, i.e., a valley counterpart of itinerant Nagaoka ferromagnetic ordering recently identified in a GaAs square cluster of quantum dots with three excess electrons [J. P. Dehollain et al., Nature (London) 579, 528 (2020)]. We find that for a Hamiltonian without intrinsic spin-orbit coupling the valley polarization in the ground state can be observed in a range of interdot spacings provided that the spin of the system is frozen by an external magnetic field. The intervalley scattering effects are negligible for a cluster geometry that supports the valley-polarized ground state. In the presence of a strong intrinsic spin-orbit coupling that is characteristic to silicene, no external magnetic field is necessary for the observation of a ground state that is polarized in both the spin and valley. The effective magnetic field due to the spin-orbit interaction produces a perfect anticorrelation of the spin and valley isospin components in the low-energy spectrum. Experimental detection of spin-valley ground-state polarization by a charge response to a potential variation is discussed.

关键词： Magnetic order Spin-orbit coupling Valleytronics Double quantum dots Graphene Quantum dots Silicene Two-dimensional electron system Exact diagonalization Tight-binding model

来源：评论

学校读者我要写书评

暂无评论

A Multifunctional Reflectarray Antenna for Sub-THz Applications 6

A Multifunctional Reflectarray Antenna for Sub-THz Applicati...

引用

6th IEEE International Conference on Electronic Information and Communication technology, ICEICT 2023

作者： Yang, Xingxing Feng, Botao Ding, Xiao Gu, Wenzhe Sun, Sanshan Chung, Kwok L. College of Electronics and Information Engineering Shenzhen University Shenzhen518060 China Macau University of Science and Technology Faculty of Humanities and Arts 999078 China School of Computer Science and Engineering Huizhou University Huizhou516007 China College of Physics and Electronic Engineering Sichuan Normal University Sichuan China

ISBN: (纸本)9798350399059

In this paper, a reflection element sensitive to polarization direction is proposed, which can independently control the phase of incident wave in dual polarized directions. Then, a reflectarray including the proposed 7×7 elements is designed to offer dual-polarized deflection. The results show that the reflectarray achieves a -15° beam deflection with an X-axis polarized incident wave. In contrast, it realizes a +15° beam deflection with a Y - axis polarized wave. In addition, the cross polarization (X-pol) level is less than -20 dB, and the gain of the array is higher than that of the waveguide feed by 8 dBi. Therefore, significant gain enhancement can be successfully obtained. © 2023 IEEE.

关键词： Polarization

来源：评论

学校读者我要写书评

暂无评论

Enhancement of the topological regime in elongated Josephson junctions

arXiv

引用

arXiv 2024年

作者： Kuiri, D. Wójcik, P. Nowak, M.P. AGH University of Krakow Academic Centre for Materials and Nanotechnology al. A. Mickiewicza 30 Krakow30-059 Poland AGH University of Krakow Faculty of Physics and Applied Computer Science al. A. Mickiewicza 30 Krakow30-059 Poland

We theoretically study topological superconductivity in elongated planar Josephson junctions. In the presence of spin-orbit coupling and an in-plane magnetic field, the Josephson junction can enter the topological phase and host zero-energy Majorana bound states over a range of the superconducting phase difference centered around π, with the span of this range determined by the strength of the magnetic field. We demonstrate that the topological superconducting phase range can be greatly increased by elongation of the junction, which causes an amplification of the Zeeman-induced phase shift of Andreev bound states. We show that the appearance of trivial in-gap states that occurs in elongated junctions can prohibit the creation of Majorana modes, but it can be mitigated by further proximitization of the junction with additional superconducting contacts. The topological transition in this system can be probed by measurements of the critical current and we show that the elongation of the junction leads to a linear decrease of the transition critical magnetic field beneficial for experimental studies. © 2024, CC BY.

关键词： Magnetic fields

来源：评论

学校读者我要写书评

暂无评论

Geometric scaling of elastic pp cross section at the LHC

arXiv

引用

arXiv 2025年

作者： Praszalowicz, Michal Institute of Theoretical Physics Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University S. Lojasiewicza 11 Kraków30-348 Poland

We show that geometric scaling conjectured and observed at the ISR more than 50 years ago, still holds at the LHC. We discuss regularities of the dip - bump structures of the differential elastic cross sections, emphasizing the fact that the ratio of bump to dip positions is constant from the ISR to the LHC. Applying crossing and analyticity we identify imaginary and real parts of the scattering amplitude and compute the ρ parameter and the ratio of bump to dip values of the differential pp cross sections. We also discuss the energy dependence of the total elastic cross section and the violation of geometrical scaling outside the dip - bump region at the LHC. © 2025, CC BY.

关键词： Topology

来源：评论

学校读者我要写书评

暂无评论

Tunable Raman activity and enhanced piezoelectricity of AlGeZ2 (Z= N, P, and As) monolayers: A first-principles calculation

引用

Ceramics International 2025年第14期51卷 19562-19567页

作者： Vu, Tuan V. Vi, Vo T.T. Phuc, Huynh V. Anh, Nguyen P.Q. Kartamyshev, A.I. Hieu, Nguyen N. Laboratory for Computational Physics Institute for Computational Science and Artificial Intelligence Van Lang University Ho Chi Minh city Viet Nam Faculty of Mechanical - Electrical and Computer Engineering School of Technology Van Lang University Ho Chi Minh city Viet Nam Faculty of Basic Sciences University of Medicine and Pharmacy Hue University Hue Viet Nam Division of Physics School of Education Dong Thap University Cao Lanh Viet Nam Faculty of Electronics and Telecommunications Saigon University 273 An Duong Vuong Ward 3 District 5 Ho Chi Minh city Viet Nam Institute of Research and Development Duy Tan University Da Nang550000 Viet Nam Faculty of Natural Sciences Duy Tan University Da Nang550000 Viet Nam

In this work, we theoretically design a series of two-dimensional (2D) materials with eight stacked sublayers AlGeZ2 (or Al2Ge2Z4) (Z= N, P, and As) and explore their structural, vibrational, piezoelectric, electronic, and transport properties via first-principles prediction. It is demonstrated that AlGeZ2 monolayers exhibit high structural stability by analyzing their phonon dispersions and ab initio molecular dynamics tests. Further, we also examine the vibrational characteristics and Raman activity of AlGeZ2 by using the finite displacement technique. At equilibrium, AlGeZ2 monolayers are found to be semiconductors with a moderate bandgap. AlGeZ2 semiconductors exhibit superior mechanical features with 2D in-plane stiffness up to 382.83 N/m (AlGeN2). The piezoelectricity examinations indicate that we can consider AlGeZ2 as piezoelectric semiconductors with in-plane piezoelectric coefficient d11 ranging from −0.22 to −0.44 pm/V. Importantly, AlGeZ2 semiconductors exhibit very high electron mobility, up to 3.71×103 cm2V−1s−1 (AlGeAs2), which is suitable for applications in flexible nanoelectronics. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Piezoelectricity

来源：评论

学校读者我要写书评

暂无评论

Percolation thresholds on a triangular lattice for neighborhoods containing sites up to the fifth coordination zone

引用

Physical Review E 2021年第5期103卷 052107-052107页

作者： Krzysztof Malarz AGH University of Science and Technology Faculty of Physics and Applied Computer Science al. Mickiewicza 30 30-059 Kraków Poland

We determine thresholds pc for random-site percolation on a triangular lattice for all available neighborhoods containing sites from the first to the fifth coordination zones, including their complex combinations. There are 31 distinct neighborhoods. The dependence of the value of the percolation thresholds pc on the coordination number z are tested against various theoretical predictions. The proposed single scalar index ξ=∑iziri2/i (depending on the coordination zone number i, the neighborhood coordination number z, and the square distance r2 to sites in ith coordination zone from the central site) allows one to differentiate among various neighborhoods and relate pc to ξ. The thresholds roughly follow a power law pc∝ξ−γ with γ≈0.710(19).

关键词： Percolation Disordered systems Finite-size scaling

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：