The European Physical Journal Special Topics最新文献_第10页

A fractional mathematical model for vaccinated humans with the impairment of Monkeypox transmission 接种过猴痘疫苗的人类传播能力受损的分数数学模型

The European Physical Journal Special Topics Pub Date : 2024-07-10 DOI: 10.1140/epjs/s11734-024-01211-5

A. Venkatesh, M. Manivel, K. Arunkumar, M. Prakash Raj, Shyamsunder, S. D. Purohit

引用次数: 0

Primordial nucleosynthesis with non-extensive statistics 非广延性统计的原始核合成

The European Physical Journal Special Topics Pub Date : 2024-07-09 DOI: 10.1140/epjs/s11734-024-01216-0

C. A. Bertulani, Shubhchintak

{"title":"Primordial nucleosynthesis with non-extensive statistics","authors":"C. A. Bertulani, Shubhchintak","doi":"10.1140/epjs/s11734-024-01216-0","DOIUrl":"https://doi.org/10.1140/epjs/s11734-024-01216-0","url":null,"abstract":"The conventional Big Bang model successfully anticipates the initial abundances of (^2)H(D), (^3)He, and (^4)He, aligning remarkably well with observational data. However, a persistent challenge arises in the case of (^7)Li, where the predicted abundance exceeds observations by a factor of approximately three. Despite numerous efforts employing traditional nuclear physics to address this incongruity over the years, the enigma surrounding the lithium anomaly endures. In this context, we embark on an exploration of Big Bang nucleosynthesis (BBN) of light element abundances with the application of Tsallis non-extensive statistics. A comparison is made between the outcomes obtained by varying the non-extensive parameter q away from its unity value and both observational data and abundance predictions derived from the conventional big bang model. A good agreement is found for the abundances of (^4)He, (^3)He and (^7)Li, implying that the lithium abundance puzzle might be due to a subtle fine-tuning of the physics ingredients used to determine the BBN. However, the deuterium abundance deviates from observations.","PeriodicalId":501403,"journal":{"name":"The European Physical Journal Special Topics","volume":"46 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141566592","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Unsupervised and lightly supervised learning in particle physics 粒子物理学中的无监督和轻监督学习

The European Physical Journal Special Topics Pub Date : 2024-07-08 DOI: 10.1140/epjs/s11734-024-01235-x

Jai Bardhan, Tanumoy Mandal, Subhadip Mitra, Cyrin Neeraj, Monalisa Patra

引用次数: 0

Complex dynamics of a fractional-order delayed epidemic model incorporating waning immunity and optimal control 包含免疫力减弱和优化控制的分数阶延迟流行病模型的复杂动力学

The European Physical Journal Special Topics Pub Date : 2024-07-08 DOI: 10.1140/epjs/s11734-024-01221-3

Suvankar Majee, Soovoojeet Jana, T. K. Kar, Bidhan Bhunia

引用次数: 0

How deep learning is complementing deep thinking in ATLAS 深度学习如何与 ATLAS 的深度思考相辅相成

The European Physical Journal Special Topics Pub Date : 2024-07-05 DOI: 10.1140/epjs/s11734-024-01238-8

Deepak Kar

引用次数: 0

A robust study of the dynamics of tumor–immune interaction for public health via fractional framework 通过分数框架对肿瘤-免疫相互作用动态进行稳健研究，促进公共健康

The European Physical Journal Special Topics Pub Date : 2024-07-05 DOI: 10.1140/epjs/s11734-024-01210-6

Meshal Shutaywi, Zahir Shah, Rashid Jan

{"title":"A robust study of the dynamics of tumor–immune interaction for public health via fractional framework","authors":"Meshal Shutaywi, Zahir Shah, Rashid Jan","doi":"10.1140/epjs/s11734-024-01210-6","DOIUrl":"https://doi.org/10.1140/epjs/s11734-024-01210-6","url":null,"abstract":"It is evident that a tumor is a dangerous lump of tissue developed through the uncontrollable division of cells, replacing healthy tissue with abnormal tissue. It is cancerous and spreads through the lymphatic system or blood within the body of a host individual while the human immune system, consisting of interrelated special cells, tissues, and organs, is employed for the protection of the body from microorganisms, foreign diseases, infections, and toxins. Thus, the conceptualization and understanding of the intersections of tumor–immune cells are valuable. In this article, the natural process of tumor–immune cell interactions is formulated through a mathematical framework. The intricate dynamics of tumor–immune interactions are then represented by means of operators of fractional calculus involving nonlocal and nonsingular kernels. The definitions and basic properties of non-integer derivatives are introduced for the investigation of the proposed system. In addition, a new numerical scheme is introduced for the dynamics, showing the chaos and oscillation of the tumor–immune system. The proposed dynamics of tumor–immune interaction are highlighted with the effect of different input factors. Our findings not only contribute to a thorough comprehension of the complex interactions between input parameters and tumor dynamics, but critical factors that have a major impact on the dynamics are also identified. These outcomes are pivotal for refining and optimizing the proposed system to enhance its predictive accuracy and efficacy in modeling tumor behavior.","PeriodicalId":501403,"journal":{"name":"The European Physical Journal Special Topics","volume":"134 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141548963","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dynamics of crystals in metastable liquids with applications to the growth of polypeptide hormones 晶体在易变质液体中的动力学及其在多肽激素生长中的应用

The European Physical Journal Special Topics Pub Date : 2024-07-04 DOI: 10.1140/epjs/s11734-024-01226-y

Dmitri V. Alexandrov, Alexander A. Ivanov, Irina V. Alexandrova, Eugenya V. Makoveeva

{"title":"Dynamics of crystals in metastable liquids with applications to the growth of polypeptide hormones","authors":"Dmitri V. Alexandrov, Alexander A. Ivanov, Irina V. Alexandrova, Eugenya V. Makoveeva","doi":"10.1140/epjs/s11734-024-01226-y","DOIUrl":"https://doi.org/10.1140/epjs/s11734-024-01226-y","url":null,"abstract":"This study is concerned with the dynamics of a polydisperse ensemble of crystals in a single-component metastable solution/melt. A new theory based on the kinetic and balance equations is developed for the description of initial and intermediate stages of bulk crystallization. Such phenomena as unsteady growth rates of individual crystals with fluctuations, diffusion of the crystal-size distribution function in the space of particle radii, the Gibbs–Thomson and atomic kinetics effects, various crystal nucleation mechanisms are taken into account. The analytical solution is constructed in a parametric form with the modified time being the decision variable. Namely, the metastability degree, particle-radius distribution function, crystallization time, total number of crystals and their mean size are found as the functions of decision variable. The analytical solutions show that the metastability degree decreases with time as a result of liquid desupersaturation/desupercooling. As this takes place, the particle-radius distribution function moves to greater particle radii, becomes wider and lower with increasing the crystallization time. The theory is tested against experiments on the growth of such polypeptide hormones as porcine and bovine insulins. We show that the theory is in good agreement with the experimental data.","PeriodicalId":501403,"journal":{"name":"The European Physical Journal Special Topics","volume":"39 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141548968","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fractional-calculus analysis of the dynamics of $$text {CD4}^{+}$$ T cells and human immunodeficiency viruses 对 $$text {CD4}^{+}$ T 细胞和人类免疫缺陷病毒动态的分数微积分分析

The European Physical Journal Special Topics Pub Date : 2024-07-04 DOI: 10.1140/epjs/s11734-024-01192-5

Abdulrahman Obaid Alshammari, Imtiaz Ahmad, Rashid Jan, Sahar Ahmed Idris

{"title":"Fractional-calculus analysis of the dynamics of $$text {CD4}^{+}$$ T cells and human immunodeficiency viruses","authors":"Abdulrahman Obaid Alshammari, Imtiaz Ahmad, Rashid Jan, Sahar Ahmed Idris","doi":"10.1140/epjs/s11734-024-01192-5","DOIUrl":"https://doi.org/10.1140/epjs/s11734-024-01192-5","url":null,"abstract":"Combination antiretroviral Therapy (cART) is the standard treatment approach for human immunodeficiency virus (HIV), involving the use of various antiretroviral drugs to effectively suppress the virus’s replication in the body. The objective of cART is to decrease the viral load in the blood to undetectable levels, enhance the immune system’s function, and ultimately prolong the patient’s life by preventing the progression to AIDS and associated opportunistic infections. In this work, we formulated the dynamics of HIV infection, including the effects of cART, within a fractional framework. This paper presents a numerical study that investigates the complex dynamics of HIV infection in (text {CD4}^{+}) T cells. The proposed HIV model incorporates the impact of antiretroviral medication via the Caputo–Fabrizio derivative. To comprehend the dynamics of the proposed HIV infection model, a numerical approach is employed. The dynamic behavior of the system is illustrated by examining the influence of various input parameters, aiming to capture the system’s sensitivity to these factors. Furthermore, this modeling approach highlights the interaction between the immune system and the virus. Through numerical simulations utilizing specific input values, we explore the chaotic and periodic behavior of HIV infection and provide insights into its intricate dynamics.","PeriodicalId":501403,"journal":{"name":"The European Physical Journal Special Topics","volume":"41 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141548967","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Stochastic nonlinear model for nanoparticles and viruses escape from endosomes 纳米粒子和病毒从内体逃逸的随机非线性模型

The European Physical Journal Special Topics Pub Date : 2024-07-03 DOI: 10.1140/epjs/s11734-024-01228-w

Vladimir Sholokhov, Eugenya V. Makoveeva, Sergei Fedotov, Dmitri V. Alexandrov

引用次数: 0

The role of astronomical forcing on stochastically induced climate dynamics 天文因素对随机诱导气候动力学的作用

The European Physical Journal Special Topics Pub Date : 2024-07-03 DOI: 10.1140/epjs/s11734-024-01231-1

Dmitri V. Alexandrov, Irina A. Bashkirtseva, Lev B. Ryashko

{"title":"The role of astronomical forcing on stochastically induced climate dynamics","authors":"Dmitri V. Alexandrov, Irina A. Bashkirtseva, Lev B. Ryashko","doi":"10.1140/epjs/s11734-024-01231-1","DOIUrl":"https://doi.org/10.1140/epjs/s11734-024-01231-1","url":null,"abstract":"This study is concerned with the influence of astronomical forcing and stochastic disturbances on non-linear dynamics of the Earth’s climate. As a starting point, we take the system of climate equations derived by Saltzman and Maasch for late Cenozoic climate changes. This system contains variations of three prognostic variables: the global ice mass, carbon dioxide concentration, and deep ocean temperature. The bifurcation diagram of deterministic system shows possible existence/coexistence of stable equilibria and limit cycle leading either to monostability or bistability. Fitting the astronomical forcing by an oscillatory function and representing the deep ocean temperature deviations by means of white Gaussian noise of various intensities, we analyze the corresponding stochastic system of Saltzman and Maasch equations for the deviations of prognostic variables from their average values (equilibrium state). The main conclusions of our study are as follows: (i) astronomical forcing causes the climate system transitions from large-amplitude oscillations to small-amplitude ones and vice versa; (ii) astronomical and stochastic forcings together cause the mixed-mode climate oscillations with intermittent large and small amplitudes. In this case, the Earth’s climate would be shifting from one stable equilibrium with a warmer climate to another stable equilibrium with a colder climate and back again.","PeriodicalId":501403,"journal":{"name":"The European Physical Journal Special Topics","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141526001","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0