检索结果-内蒙古大学图书馆

arXiv 2021年

作者： Bozek, Piotr Samanta, Rupam AGH University of Science and Technology Faculty of Physics and Applied Computer Science aleja Mickiewicza 30 Cracow30-059 Poland

We study correlations between harmonic flow vectors squared measured at different transverse momenta. One of the flow harmonics squared is taken at a fixed transverse momentum and correlated to the momentum averaged harmonic flow squared of the same order. Such four particle correlators, dependent on transverse momentum, have been recently measured experimentally. Factorization coefficients based on the ratio of such four-particle correlators allow the independent measurement of the flow vector and flow magnitude factorization breaking coefficient. Moreover, the correlation of the angles of flow harmonics as a function of transverse momentum can be extracted. Results are compared to preliminary data of the ALICE Collaboration. We also present predictions for the momentum dependent factorization breaking coefficient between mixed flow harmonics. The correlators with squares of mixed harmonics can serve as a way to independently measure the flow vector, flow magnitude, and flow angle correlations, and could be used to gain additional information on the fluctuating initial state and the dynamics in heavy-ion collisions. © 2021, CC BY.

关键词： Factorization

来源：评论

学校读者我要写书评

暂无评论

Secrecy Performance of Joint Antenna and User Selection in Cognitive Ambient Backscattering Communications

Secrecy Performance of Joint Antenna and User Selection in C...

引用

IEEE Conference on Vehicular Technology (VTC)

作者： Ahmed N. Elbattrawy Ahmed H. Abd El-Malek Sherif I. Rabia Waheed K. Zahra Basic and Applied Sciences Institute Egypt-Japan University of Science and Technology (E-JUST) New Borg El-Arab City Alexandria Egypt School of Electronics Communications and Computer Engineering Egypt-Japan University of Science and Technology New Borg El-Arab City Alexandria Egypt Department of Engineering Mathematics and Physics Faculty of Engineering Alexandria University Alexandria Egypt

ISBN: (数字)9798331517786

ISBN: (纸本)9798331517793

In this work, we investigate the security performance of an underlay cognitive radio network (CRN) with ambient backscatter communication (AmBC), where a backscattering device (BD) shares the spectrum and the receivers with the secondary user. Different from the related work, we consider a secondary user transmitter (ST) with multiple antenna in an AmBC-CRN with multiple receivers and multiple passive eavesdroppers. The ST performs joint antenna-user selection to enhance its security performance and overcome the performance degradation caused by BD interference. Considering the Nakagami-m fading model, closed-form expressions are derived for the secrecy outage probability for both the ST and the BD transmissions. Monte Carlo simulations are performed to validate the derived closed-form expressions. Numerical results show that employing joint antenna-user selection enhances the ST security performance by exploiting antenna and user diversity.

关键词： Performance evaluation Fading channels Vehicular and wireless technologies Closed-form solutions System performance Radio transmitters Receiving antennas Interference MIMO communication Backscatter

来源：评论

学校读者我要写书评

暂无评论

Magnesium Substituted Copper Ferrite as an Effective Catalyst for the Organic Dyes Decomposition

Magnesium Substituted Copper Ferrite as an Effective Catalys...

引用

International Conference on Nanomaterials: Application & Properties (NAP)

作者： Julia Mazurenko Larysa Kaykan Mariia Moklyak Khrystyna Bandura Lukasz Gondek Antoni Żywczak Department of Medical Informatics Medical and Biological Physics Ivano Frankivsk National Medical University Ivano Frankivsk Ukraine Laboratory for Physics of Magnetic Films №23 G. V. Kurdyumov Institute for Metal Physics of the National Academy of Sciences of Ukraine Kyiv Ukraine Department of Materials Science and New Technologies Vasyl Stefanyk Precarpathian National University Ivano Frankivsk Ukraine Faculty of Physics and Applied Computer Science AGH University of Krakow Cracow Poland Academic Centre for Materials and Nanotechnology AGH University of Krakow Cracow Poland

ISBN: (数字)9798350380125

ISBN: (纸本)9798350380132

In this study, a series of magnesium-substituted spinels with general compositions of $\mathbf{M g}_{x} \mathrm{Cu}_{1-\mathrm{x}} \mathrm{Fe}_{2} \mathrm{O}_{4}$, where x varies from 0.0 to 1.0 a step of 0.2, was synthesize via the solgel autocombustion method. Citric acid is used as the chelating agent. The phase composition, particle size, and morphology of the materials were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), and X-ray dispersion analysis. The effects of magnesium substitution on the magnetic properties of the samples were evaluated using a vibrating sample magnetometer (VSM). Additionally, degradation tests were conducted using spectrophotometer, with methylene blue (MB) selected as the model pollutant. The study demonstrates alterations in the structure and magnetic properties of the synthesized material. The spinel produced via self-combustion was found to be a mesoporous material with strong magnetic properties and significant sensitivity to visible light. Degradation tests using methylene blue as a pollutant showed effective dye removal, achieving 95% efficiency within 160 minutes. The copper spinel modified with magnesium ions proved to be an environmentally safe, stable, and effective photo-Fenton catalyst that is simple to synthesize and suitable for practical applications.

关键词： Ferrites Degradation X-ray scattering X-ray diffraction Ions Magnesium Copper Photocatalysts Saturation magnetization Magnetic properties

来源：评论

学校读者我要写书评

暂无评论

Maximal Quantum Interaction between Free Electrons and Photons

引用

Physical Review Letters 2025年第4期134卷 043803-043803页

作者： Zetao Xie Zeling Chen Hao Li Qinghui Yan Hongsheng Chen Xiao Lin Ido Kaminer Owen D. Miller Yi Yang Department of Physics and HK Institute of Quantum Science and Technology The University of Hong Kong Pokfulam Hong Kong China Z. X. and Z. C. contributed equally to this Letter. Department of Applied Physics and Energy Sciences Institute Yale University New Haven Connecticut 06520 USA Interdisciplinary Center for Quantum Information State Key Laboratory of Modern Optical Instrumentation College of Information Science and Electronic Engineering Zhejiang University Hangzhou 310027 China Solid State Institute and Faculty of Electrical and Computer Engineering Technion—Israel Institute of Technology 32000 Haifa Israel

The emerging field of free-electron quantum optics enables electron-photon entanglement and holds the potential for generating nontrivial photon states for quantum information processing. Although recent experimental studies have entered the quantum regime, rapid theoretical developments predict that qualitatively unique phenomena only emerge beyond a certain interaction strength. It is thus pertinent to identify the maximal electron-photon interaction strength and the materials, geometries, and particle energies that enable one to approach it. We derive an upper limit to the quantum vacuum interaction strength between free electrons and single-mode photons, which illuminates the conditions for the strongest interaction. Crucially, we obtain an explicit energy selection recipe for electrons and photons to achieve maximal interaction at arbitrary separations and identify two optimal regimes favoring either fast or slow electrons over those with intermediate velocities. We validate the limit by analytical and numerical calculations on canonical geometries and provide near-optimal designs indicating the feasibility of strong quantum interactions. Our findings offer fundamental intuition for maximizing the quantum interaction between free electrons and photons and provide practical design rules for future experiments on electron-photon and electron-mediated photon-photon entanglement. They should also enable the evaluation of key metrics for applications such as the maximum power of free-electron radiation sources and the maximum acceleration gradient of dielectric laser accelerators.

关键词： Quantum optics

来源：评论

学校读者我要写书评

暂无评论

Massively winning configurations in the convex grabbing game on the plane

arXiv

引用

arXiv 2021年

作者： Dvorak, Martin Nicholson, Sara Department of Theoretical Computer Science and Mathematical Logic Faculty of Mathematics and Physics Charles University Institute of Science and Technology Austria Department of Applied Mathematics Faculty of Mathematics and Physics Charles University

The convex grabbing game is a game where two players, Alice and Bob, alternate taking extremal points from the convex hull of a point set on the plane. Rational weights are given to the points. The goal of each player is to maximize the total weight over all points that they obtain. We restrict the setting to the case of binary weights. We show a construction of an arbitrarily large odd-sized point set that allows Bob to obtain almost 3/4 of the total weight. This construction answers a question asked by Matsumoto, Nakamigawa, and Sakuma in [Graphs and Combinatorics, 36/1 (2020)]. We also present an arbitrarily large even-sized point set where Bob can obtain the entirety of the total weight. Finally, we discuss conjectures about optimum moves in the convex grabbing game for both players in general. Copyright © 2021, The Authors. All rights reserved.

关键词： Geometry

来源：评论

学校读者我要写书评

暂无评论

Anchoring Groups for Ordered and Highly Stable Sams on Naturally Oxidized Aluminum – Phosphonate Versus Carboxylate

SSRN

引用

SSRN 2024年

作者： Cegielka, Daria M. Koziel, Krzysztof Zharnikov, Michael Cyganik, Piotr Jagiellonian University Doctoral School of Exact and Natural Sciences Lojasiewicza 11 Krakow30-348 Poland Jagiellonian University Faculty of Physics Astronomy and Applied Computer Science Smoluchowski Institute of Physics Lojasiewicza 11 Krakow30-348 Poland Jagiellonian University Faculty of Chemistry Gronostajowa 2 Krakow30-387 Poland Angewandte Physikalische Chemie Universität Heidelberg Im Neuenheimer Feld 253 HeidelbergD-69120 Germany

Modification of metal oxide surfaces by self-assembled monolayers (SAMs) is attracting growing attention. Carboxylic (CA) and phosphonic (PA) acids are most popular anchoring groups in this context, applied to create hydrophobic coatings, biosensors, and organic field-effect transistors. The efficiency of these devices is crucially affected by the structural quality and stability of the SAM. In this context, we studied the effect of the preparation procedure (solvent, incubation time, and temperature) on the quality of PA SAMs on naturally oxidized aluminum. We demonstrate formation of PA SAMs matching structural quality of archetypical alkanethiols on gold. Next, we compare their stability with analogue CA SAMs. Our data show that PA SAMs not only exhibit much higher hydrolytic stability but are also capable to protect aluminum substrate from oxidation and degradation. Importantly, even small improvement of the PA SAMs quality, translates into enormous increase of their hydrolytic stability crucial for majority of applications. Finally, we demonstrate that the thermal stability of PA on oxidized aluminum is by ~250 K higher than CA SAMs, and by ~200 K higher than for thiols on gold, which makes PA SAMs an excellent candidate for organic electronics, where overheating problems and high-temperature fabrication procedures are common issues. © 2024, The Authors. All rights reserved.

关键词： Aluminum

来源：评论

学校读者我要写书评

暂无评论

Application of silicon-polymer composite varistors to protect sensitive medical imaging circuits and performing better voltage bias for SIPMS

Application of silicon-polymer composite varistors to protec...

引用

作者： Ardebili, F. Tayefi Ghafouri, M. Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University Kraków Poland Department of Physics Shabestar Branch Islamic Azad University Shabestar Iran

Nowadays, Silicon photomultipliers (SiPM) become a reasonable choice for Time-of-Flight Positron Emission Tomography (TOF-PET). To achieve the best performance of SiPMs, it is necessary to adjust a suitable voltage bias. In this article, we are using varistors which protect SiPM from voltage fluctuations. The silicon-polymer composite varistors prepared using hot press method have been investigated. Research on (current-voltage) characteristics of samples shows that by increasing silicon content in the mixture, the breakdown voltage decreases from 110 V to 70 V. The results also show that increasing silicon content decreases the potential barrier height from 0.29 eV to 0.26 eV, however, leakage current increases. Increasing silicon content increases nonlinear coefficient from 4.1 to 4.8. Using these techniques gives us ability to produce suitable surge protector for medical imaging modalities. © 2020 Jagellonian University. All rights reserved.

关键词： Timing circuits

来源：评论

学校读者我要写书评

暂无评论

A New Prediction Model for Lung Cancer Based on ANN-SVM 5

A New Prediction Model for Lung Cancer Based on ANN-SVM

引用

5th International Conference on computer Information science and Application Technology, CISAT 2022

作者： Li, Hua Lu, Yongchen Wang, Junyi Zhang, Yue Faculty of Chemical Engineering Beijing University of Chemical technology 15 Beisanhuan Dong Lu Chaoyang District Beijing100029 China School of Information Studies Syracuse University 900 South Crouse Ave SyracuseNY13244 United States Faculty of Computer Science and Technology Harbin Institute of Technology 2 Wenhua Xi Lu Huancui District Weihai264200 China Faculty of applied physics Jinan University 601 Huangpu Dadao Xi Tianhe District Guangzhou510632 China

ISBN: (纸本)9781510660076

Lung cancer has become a major threat to human life and health due to its characteristics of difficulty in early diagnosis and high mortality. Therefore, to develop a reliable method to predict lung cancer is very important. This study provides a new prediction method based on artificial intelligence technology. Firstly, a data set of patients' physical health status was collected, and the correlation between various variables and lung cancer was analyzed using random forest model. Then, the data sets were brought into some common data sets for training and the accuracy of these models was obtained. Then, the neural network technology is used to preliminarily process the data into feature vectors, and then the feature vectors are input into the support vector machine model, and the ANN-SVM hybrid model is established and trained. The results of this model are optimized by adjusting various model parameters and compared with the results of other common prediction models. Finally, a lung cancer prediction APP is made by using this model. Random forest results show that gender, alcohol consuming, and peer pressure are the main factors leading to lung cancer. The prediction accuracy of Ann-SVM model is up to 95.1613% shown by the cross-validation, which is higher than 2.8780%-8.5446% compared with other common prediction models, indicating that the model and prediction APP have practical value. © 2022 SPIE.

关键词： Decision trees

来源：评论

学校读者我要写书评

暂无评论

Quantum convolutional channels and multiparameter families of 2-unitary matrices

arXiv

引用

arXiv 2023年

作者： Bistroń, Rafal Czartowski, Jakub Życzkowski, Karol Faculty of Physics Astronomy and Applied Computer Science Institute of Theoretical Physics Jagiellonian University ul. Lojasiewicza 11 Kraków30–348 Poland Doctoral School of Exact and Natural Sciences Jagiellonian University Poland Center for Theoretical Physics Polish Academy of Sciences Al. Lotników 32/46 Warszawa02-668 Poland

Many alternative approaches to construct quantum channels with large entangling capacity were proposed in the past decade, resulting in multiple isolated gates. In this work, we put forward a novel one, inspired by convolution, which provides greater freedom of nonlocal parameters. Although quantum counterparts of convolution have been shown not to exist for pure states, several attempts with various degrees of rigorousness have been proposed for mixed states. In this work, we follow the approach based on coherifications of multi-stochastic operations and demonstrate a surprising connection to gates with high entangling power. In particular, we identify conditions necessary for the convolutional channels constructed using our method to possess maximal entangling power. Furthermore, we establish new, continuous classes of bipartite 2-unitary matrices of dimension d2 for d = 7 and d = 9, with 2 and 4 free nonlocal parameters beyond simple phasing of matrix elements, corresponding to perfect tensors of rank 4 or 4-partite absolutely maximally entangled states. © 2023, CC BY.

关键词： Convolution

来源：评论

学校读者我要写书评

暂无评论

Models of Battle Dynamics in Strategic computer Games

Models of Battle Dynamics in Strategic Computer Games

引用

International Conference on Management of Large-Scale System Development (MLSD)

作者： Ivan Dmitrievich Laryushin Dmitrii Sergeevich Pashin Yaroslav Alekseevich Koltochenko Felix Ivanovich Ereshko Plasma Physics Department Gaponov-Grekhov Institute of Applied Physics RAS Nizhny Novgorod Russia Faculty of Physics National Research Lobachevsky State University of Nizhny Novgorod Nizhny Novgorod Russia Department of Mathematical Modeling of Complex Systems and Optimization Moscow Institute of Physics and Technology Moscow Russia Department of Information and Computing Systems Federal Research Center "Computer Science and Control" of the RAS Moscow Russia

A set of new models that describe the dynamics of battles in strategic computer games is presented. These models not only have descriptive functions, but also allow solving problems of optimizing army control under given conditions, as well as calculating the most efficient composition of the army for the planned operation within a computer game.

关键词：

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：