The European Physical Journal B最新文献_第9页

Overview of the initial phase of scientific production on COVID-19 during the pandemic 大流行病期间 COVID-19 初期科研生产概况

IF 1.6 4区物理与天体物理

The European Physical Journal B Pub Date : 2024-07-08 DOI: 10.1140/epjb/s10051-024-00734-z

Hernane Borges de Barros Pereira, Ludmilla Monfort Oliveira Sousa, Maíra Lima de Souza, Thiago B. Murari, Marcelo A. Moret

{"title":"Overview of the initial phase of scientific production on COVID-19 during the pandemic","authors":"Hernane Borges de Barros Pereira, Ludmilla Monfort Oliveira Sousa, Maíra Lima de Souza, Thiago B. Murari, Marcelo A. Moret","doi":"10.1140/epjb/s10051-024-00734-z","DOIUrl":"10.1140/epjb/s10051-024-00734-z","url":null,"abstract":"<p>A novel virus begin to spread worldwide in 2020. Many studies have been conducted to better understand the outbreak that continues to affect the global population. The contribution of the present study is to provide an overview of the papers published in the first months since recognition of the first case of COVID-19. For this, a survey of scientific publications during the first 5 months of the outbreak was conducted. Semantic, coauthorship and citation networks were used to identify the most relevant themes and authors during the cited period. Coauthorship indicated that scientists from several countries had joined forces in the fight against the pandemic to produce many joint scientific publications on the newly discovered virus and the disease it caused. Coauthorship was spread across 1170 author groups. Regarding the semantic network of titles, we found that it was a hybrid network because it presented the small-world phenomenon and a power law in its degree distribution and was therefore scale invariant. Considering the citation network, we found that the distribution of indegrees followed a power law, and with it, we observed the most cited works due to their importance to the area and their cumulative advantage. The coauthorship, semantic, and citation networks clearly show some characteristics of complex systems.</p>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"97 7","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141568048","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dynamic behavior of memristor ML neurons and its application in secure communication 忆阻器 ML 神经元的动态行为及其在安全通信中的应用

IF 1.6 4区物理与天体物理

The European Physical Journal B Pub Date : 2024-07-05 DOI: 10.1140/epjb/s10051-024-00719-y

Kaijun Wu, Zhaoxue Huang, Mingjun Yan

{"title":"Dynamic behavior of memristor ML neurons and its application in secure communication","authors":"Kaijun Wu, Zhaoxue Huang, Mingjun Yan","doi":"10.1140/epjb/s10051-024-00719-y","DOIUrl":"10.1140/epjb/s10051-024-00719-y","url":null,"abstract":"<div><p>Improving neurons in a real physiological environment and studying their electrical behavior is crucial for understanding human cognitive brain functions and neural dynamics. Neuronal cells reside in a complex physiological environment, where the electromagnetic fields generated by ion transmembrane movements affect their discharge activity. Therefore, to better simulate the real conditions of biological neurons, this paper incorporated the characteristics of the memristor and constructed a four-dimensional Morris-Lecar (ML) neuron model by adding a magneto-controlled memristor into the three-dimensional ML neuron model. Through the study of time series diagrams, phase plane diagrams, inter-spike interval (ISI) bifurcation diagrams, we explored the effects of the feedback gain coefficient and the relationship coefficient between membrane potential and magnetic flux on the firing behavior of neurons in the model. It was found that variations in these two parameters can lead to complex firing patterns in neurons. We also utilized the maximum Lyapunov exponent and dissipative theory to investigate the chaotic synchronization phenomenon in the memristor-based ML neuron model. Additionally, we explored the impact of noise on neuronal synchronization behavior within the system, finding that an appropriate noise intensity can effectively accelerate the neurons’ attainment of a synchronized state. Finally, applying the chaotic synchronization system to secure Communication, the simulation results and related analysis demonstrate that the system excels in encrypting and decrypting voice signals, offering high levels of security and confidentiality.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div><div><p>Simulation results of speech signal encryption and decryption</p></div></div></figure></div></div>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"97 7","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141568049","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Bifurcation and multiple timescale dynamics of mixed bursting in the neuronal model 神经元模型中混合猝发的分岔和多时标动力学

IF 1.6 4区物理与天体物理

The European Physical Journal B Pub Date : 2024-07-03 DOI: 10.1140/epjb/s10051-024-00732-1

Fen Ma, Lixia Duan, Zhihui Wang, Yong Zhao

引用次数: 0

The mechanical properties of advanced U–Si compounds using first principles method 利用第一原理法研究先进铀-硅化合物的力学性能

IF 1.6 4区物理与天体物理

The European Physical Journal B Pub Date : 2024-07-03 DOI: 10.1140/epjb/s10051-024-00736-x

Hengfeng Gong, Daxi Guo, Jianhan Zhai, Jiwei Wang, Minzhou Chen, Lixiang Wu, Jiaxiang Xue, Yehong Liao

{"title":"The mechanical properties of advanced U–Si compounds using first principles method","authors":"Hengfeng Gong, Daxi Guo, Jianhan Zhai, Jiwei Wang, Minzhou Chen, Lixiang Wu, Jiaxiang Xue, Yehong Liao","doi":"10.1140/epjb/s10051-024-00736-x","DOIUrl":"10.1140/epjb/s10051-024-00736-x","url":null,"abstract":"<div><p>Due to high thermal conductivity and higher fissile density, one of the most options being pursued for accident-tolerant fuels is U–Si fuels. Unfortunately, the data available for U–Si fuels are rather limited now. Based on a few assumptions regarding geometry structures, electronic properties, elastic constants and hardness are predicted systematically for U–Si compounds using density functional theory (DFT) in this work. The calculation results show that the U<sub>3</sub>Si<sub>2</sub>, β-U<sub>3</sub>Si and γ-U<sub>3</sub>Si compounds are metallic and brittle, which is in good agreement with the previous experimental results. The Si-rich USi<sub>1.84</sub> compound presents the ductile. By analyzing shear anisotropy factors, it is found that the U<sub>3</sub>Si<sub>2</sub>, β-U<sub>3</sub>Si and Si-rich USi<sub>1.84</sub> have the anisotropic characteristics, while the γ-U<sub>3</sub>Si is isotropic. Moreover, among the U<sub>3</sub>Si<sub>2</sub>, β-U<sub>3</sub>Si, γ-U<sub>3</sub>Si and Si-rich USi<sub>1.84</sub> compounds, the γ-U<sub>3</sub>Si is hardest and Si-rich USi<sub>1.84</sub> is softest, then U<sub>3</sub>Si<sub>2</sub> is much harder than that of β-U<sub>3</sub>Si by the Voigt hardness calculations. The hardness value of U<sub>3</sub>Si<sub>2</sub> is overestimated in our calculation than experimental data, mainly because the model may be ideal without considering defects and microstructure. The theoretical investigation of this work will be expected to provide parameters for the physical models in the advanced fuel rod performance analysis.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div><div><p>The relationship between crystal structures and three dimensions elastic constants</p></div></div></figure></div></div>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"97 7","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141527910","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

GHG emissions in Brazilian Agriculture and livestock sectors and the risk to Amazonia conservation 巴西农业和畜牧业的温室气体排放及其对亚马孙保护的风险

IF 1.6 4区物理与天体物理

The European Physical Journal B Pub Date : 2024-07-02 DOI: 10.1140/epjb/s10051-024-00720-5

Eder Johnson de Area Leão Pereira, Luisa Maria Diele-Viegas, Luiz Carlos de Santana Ribeiro

引用次数: 0

Bayesian inference of the mean power of several Gaussian data 若干高斯数据平均功率的贝叶斯推断

IF 1.6 4区物理与天体物理

The European Physical Journal B Pub Date : 2024-06-29 DOI: 10.1140/epjb/s10051-024-00737-w

Giovanni Mana, Carlo Palmisano

引用次数: 0

Effect of time oscillating magnetic fields on the vortex dynamics of superconducting thin films with columnar defect and slit 时间振荡磁场对带有柱状缺陷和狭缝的超导薄膜涡旋动力学的影响

IF 1.6 4区物理与天体物理

The European Physical Journal B Pub Date : 2024-06-28 DOI: 10.1140/epjb/s10051-024-00724-1

Yufeng Zhao, Yuan Du, Ping Ma

引用次数: 0

Intriguing properties of transport at the microscales: Langevin equation approach 微观尺度传输的奇妙特性：朗之万方程方法

IF 1.6 4区物理与天体物理

The European Physical Journal B Pub Date : 2024-06-25 DOI: 10.1140/epjb/s10051-024-00718-z

J. Spiechowicz, J. Łuczka

引用次数: 0

Temperature dependence of photoconductivity in layered semiconductor p-GaSe 层状半导体 p-GaSe 中光电导的温度依赖性

IF 1.6 4区物理与天体物理

The European Physical Journal B Pub Date : 2024-06-25 DOI: 10.1140/epjb/s10051-024-00731-2

T. G. Naghiyev, R. F. Babayeva, Y. I. Aliyev

引用次数: 0

Super-diffusion in multiplex networks with long-range interactions 具有长程相互作用的多路复用网络中的超级扩散

IF 1.6 4区物理与天体物理

The European Physical Journal B Pub Date : 2024-06-25 DOI: 10.1140/epjb/s10051-024-00722-3

Alfonso Allen-Perkins, Alfredo Blanco Serrano, Roberto F. S. Andrade

{"title":"Super-diffusion in multiplex networks with long-range interactions","authors":"Alfonso Allen-Perkins, Alfredo Blanco Serrano, Roberto F. S. Andrade","doi":"10.1140/epjb/s10051-024-00722-3","DOIUrl":"10.1140/epjb/s10051-024-00722-3","url":null,"abstract":"<p>This work investigates the emergence of structural super-diffusion in finite multiplex networks, focusing on situations where long-range interactions (LRIs) are present in at least one of the layers. Employing the Lévy random walk model, we explore how the likelihood of observing LRIs and the strength of the coupling among layers, specifically through the inter-layer diffusion coefficient, affect the relaxation time of the entire multiplex network. Our aim is to determine if this collective relaxation time is shorter compared to that in isolated layer configurations. We quantify the relaxation times through algebraic connectivity, the second-smallest eigenvalue of the network’s (Supra-)Laplacian matrix. The formalism is adapted to scenarios where long-range jumps may exist by considering Mellin or Laplace transforms. We study samples of multiplexes whose layers are obtained from the models by Erdös-Rény, Watts-Strogatz and Barabási-Albert, and discuss in great detail the results for multiplexes with two layers. Besides the rather common enhancement of multiplex diffusion in comparison to the diffusion observed in their isolated layers, our results show that the timescale of layers with LRIs may be still faster than that due only to the usual multiplex network, speeding-up the whole system’s diffusion. In addition, we also provide enough evidences that a novel linear diffusion regime emerges with strong inter-layer coupling and the presence of LRIs in one or more layers.</p><p>Graphical Abstract highlights the main focus of the work, the occurrence of superdiffusion in a multiplex with <span>(M=2)</span> layers. The connectivity ratio <span>(eta = Lambda _2/textrm{max}(lambda ^1_2,lambda ^2_2))</span> (red line) crosses the dashed line <span>(eta =1)</span> at a well defined value of <span>(mathrm {D_x})</span>, and remains in the super-diffusion region highlighted in green</p>","PeriodicalId":787,"journal":{"name":"The European Physical Journal B","volume":"97 6","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141527912","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0