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Complexiton and interaction solutions to a specific form of extended Calogero–Bogoyavlenskii–Schiff equation via its bilinear form 通过其双线性形式的扩展卡洛吉罗-博戈亚夫伦斯基-希夫方程特定形式的全复和交互解
Pub Date : 2024-08-08 DOI: 10.1515/jncds-2024-0029
Sukri Khareng, Ömer Ünsal
In this article, we are focusing on an extended Calogero–Bogoyavlenskii–Schiff equation which was altered originally from a new generalized fourth-order nonlinear differential equation that obtained from Calogero–Bogoyavlenskii–Schiff equation. We apply simplified Hirota method, which is an exclusive form of the direct Hirota bilinear method, to a specific form of a new generalized fourth-order nonlinear differential equation. The key point in applicability of referred method is attainability proper forms of dispersion relations and phase shifts. Through this procedure, we present different types of solutions for three different cases. We also give constrictions for each solution type in this work so that readers can distinguish differences among types of solutions. In addition, we introduce some graphical representations for obtained solutions, even for existence of complexiton and interaction solutions.
本文主要研究扩展的 Calogero-Bogoyavlenskii-Schiff 方程,该方程最初是由 Calogero-Bogoyavlenskii-Schiff 方程得到的一个新的广义四阶非线性微分方程改变而来的。我们将简化广田法(直接广田双线性法的一种独特形式)应用于新的广义四阶非线性微分方程的特定形式。简化广田法是直接广田双线性法的一种独特形式,适用于新的广义四阶非线性微分方程的特定形式。该方法适用性的关键点是获得适当形式的频散关系和相移。通过这一过程,我们提出了三种不同情况下的不同解法。我们还给出了每种求解类型的限制条件,以便读者区分不同类型求解的差异。此外,我们还为所获得的解,甚至是复合子和相互作用解的存在介绍了一些图形表示法。
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引用次数: 0
RANS study of surface roughness effects on ship resistance 表面粗糙度对船舶阻力影响的 RANS 研究
Pub Date : 2024-06-17 DOI: 10.1515/jncds-2024-0009
Zainab Ali, Gabriella Bognár
Abstract In marine engineering, optimizing the performance of vessels is a key issue, particularly in increasing fuel efficiency, reducing operating costs, and minimizing environmental impact. One of the most critical determinants of vessel efficiency is hull resistance, which directly affects fuel consumption, power requirements, and cruising speed. We aim to investigate how surface roughness affects hull flow resistance, to quantify the drag variation at different surface roughness levels using special wall functions that reproduce boundary layer dynamics. This approach involves the complex interaction between the intricate complexity of roughness and the nonlinear pressure drag effects on the hull. The KVLCC2 ship model is used as a representative prototype in the CFD analysis based on the RANS equations and the k-omega SST model to independently evaluate the roughness effects on individual ship sections. The comparative analysis with empirical data reveals the complex relationship between surface roughness and ship resistance and provides insights for ship design and operational improvement. The study investigates the interaction between drag coefficient and vessel performance to improve hydrodynamic efficiency.
摘要 在海洋工程中,优化船舶性能是一个关键问题,尤其是在提高燃油效率、降低运营成本和减少环境影响方面。船体阻力是决定船舶效率的最关键因素之一,它直接影响燃料消耗、动力需求和巡航速度。我们的目标是研究表面粗糙度如何影响船体流动阻力,并利用再现边界层动力学的特殊壁面函数量化不同表面粗糙度水平下的阻力变化。这种方法涉及粗糙度的复杂性与船体上的非线性压力阻力效应之间复杂的相互作用。在基于 RANS 方程和 k-omega SST 模型的 CFD 分析中,以 KVLCC2 船舶模型为代表原型,独立评估粗糙度对单个船体截面的影响。与经验数据的对比分析揭示了表面粗糙度与船舶阻力之间的复杂关系,为船舶设计和运行改进提供了启示。该研究探讨了阻力系数与船舶性能之间的相互作用,以提高水动力效率。
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引用次数: 0
On the construction of various soliton solutions of two space-time fractional nonlinear models 论两个时空分数非线性模型的各种孤子解的构建
Pub Date : 2024-05-09 DOI: 10.1515/jncds-2023-0103
K. U. Tariq, Jian-Guo Liu
In this article, we investigate a couple of nonlinear fractional models of eminent interests subsequently the conformable derivative sense is used to designate the fractional order derivatives. The given structures are transformed into nonlinear ordinary differential equations of integer order, and the extended simple equation technique is then employed to solve the resulting equations. Initially, the nonlinear space time fractional Klein–Gordon equation is considered emerging from quantum and classical relativistic mechanics, which have application in plasma physics, dispersive wave phenomena, quantum field theory, and optical fibres. Later, the (2 + 1)-dimensional time fractional Zoomeron equation is analysed which is convenient to explore the innovative phenomena related to boomerons and trappons. As a result, various new soliton solutions are successfully established. The reported results offer a key implementation for analysing the soliton solutions of nonlinear fractional models which are extremely encouraging arising in the recent era of science and engineering. The 3D simulations have been carried out to demonstrate dynamics of the various soliton solutions for a given set of parameters.
在本文中,我们研究了几个具有重要意义的非线性分式模型,然后用符合导数的意义来指定分式阶导数。给定的结构被转化为整数阶的非线性常微分方程,然后利用扩展的简单方程技术求解所得到的方程。最初,我们考虑了量子力学和经典相对论力学中出现的非线性时空分数克莱因-戈登方程,它在等离子体物理、色散波现象、量子场论和光纤中都有应用。随后,分析了(2 + 1)维时间分数佐默龙方程,这便于探索与回旋波和拖曳波有关的创新现象。结果,成功建立了各种新的孤子解决方案。所报告的结果为分析非线性分数模型的孤子解提供了关键的实现方法,这在近代科学和工程学中是非常令人鼓舞的。我们进行了三维模拟,以展示给定参数集下各种孤子解的动态。
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引用次数: 0
A spatial model to understand tuberculosis granuloma formation and its impact on disease progression 了解结核病肉芽肿形成及其对疾病进展影响的空间模型
Pub Date : 2024-03-12 DOI: 10.1515/jncds-2023-0035
Peng Feng
Tuberculosis (TB) is caused by a bacterium called Mycobacterium tuberculosis (Mtb). When Mtb enters inside the pulmonary alveolus, it is phagocytosed by the alveolar macrophages, followed by a cascade of immune responses. This leads to the recruitment and accumulation of additional macrophages and T cells in the pulmonary tissues. A key outcome of this is the formation of granuloma, the hallmark of TB infection. In this paper, we develop a mathematical model of the evolution of granuloma by a system of partial differential equations that is based on the classical Keller–Segel chemotaxis equation. We investigate the effect of different parameters on the formation of granuloma. We present numerical simulation results that illustrate the impact of different parameters. The implication of our result on the disease progression is also discussed.
结核病(TB)是由一种名为结核分枝杆菌(Mtb)的细菌引起的。当 Mtb 进入肺泡内部时,会被肺泡巨噬细胞吞噬,随后产生一系列免疫反应。这导致肺组织中更多巨噬细胞和 T 细胞的招募和聚集。其主要结果是形成肉芽肿,这是肺结核感染的标志。本文以经典的 Keller-Segel 趋化方程为基础,通过偏微分方程系统建立了肉芽肿演变的数学模型。我们研究了不同参数对肉芽肿形成的影响。我们给出了数值模拟结果,以说明不同参数的影响。我们还讨论了我们的结果对疾病进展的影响。
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引用次数: 0
A mathematical model to study herbal and modern treatments against COVID-19 研究针对 COVID-19 的草药和现代疗法的数学模型
Pub Date : 2024-03-11 DOI: 10.1515/jncds-2023-0062
A. J. Ouemba Tassé, B. Tsanou, Cletus Kwa Kum, Jean Lubuma
In this paper, we propose a two-group deterministic COVID-19 model which takes into account educational campaigns and the fact that people infected with COVID-19 may choose either modern (allopathic) medicine, traditional medicine or may combine the two modes of treatment. The model is analysed in the case where modern medicine is the only mode of treatment and when traditional medicine is taken as an adjuvant (or another mode of treatment). We prove in the first case that the model has a disease-free equilibrium (DFE), globally asymptotically stable when the control reproduction number is less than one and whenever it is greater than one, we prove the local asymptotic stability of the endemic equilibrium. In the second case, we prove that, misconceptions in the population lead to a backward bifurcation phenomenon, which makes the control of the disease more difficult. We derive using the Lyapunov method that a threshold T $mathcal{T}$ ensures the global asymptotic stability of DFE in some cases when its value is less than one. Both models are fitted using daily COVID-19 cumulative cases reported from January to February 2022 in South Africa. We found a control reproduction number less than one, meaning that COVID-19 will be eliminated. Comparison of the two models fits highlights that misconceptions should be taken into account to accurately describe the dynamics of COVID-19 in South Africa. Numerically, we prove that educational campaigns should focus on preventive measures and both traditional and allopathic medicine health care systems should complement each other in the fight against COVID-19.
在本文中,我们提出了一个两组确定性 COVID-19 模型,该模型考虑到了教育活动以及 COVID-19 感染者可以选择现代(对抗疗法)医学、传统医学或将两种治疗方式结合起来这一事实。该模型在现代医学是唯一治疗模式和传统医学是辅助治疗(或另一种治疗模式)的情况下进行分析。在第一种情况下,我们证明了该模型具有无病均衡(DFE),当控制繁殖数小于 1 时,该均衡具有全局渐近稳定性;当控制繁殖数大于 1 时,我们证明了地方病均衡的局部渐近稳定性。在第二种情况下,我们证明种群中的错误认识会导致向后分叉现象,从而增加疾病控制的难度。我们利用 Lyapunov 方法推导出,当阈值 T $mathcal{T}$ 小于 1 时,在某些情况下可确保 DFE 的全局渐近稳定性。我们利用南非 2022 年 1 月至 2 月期间报告的 COVID-19 每日累积病例对这两个模型进行了拟合。我们发现控制再现数小于 1,这意味着 COVID-19 将被消除。通过比较两个模型的拟合结果,我们发现要想准确描述 COVID-19 在南非的动态变化,就必须将误解考虑在内。我们用数字证明,教育活动应侧重于预防措施,传统医学和对抗疗法的医疗保健系统应相互补充,共同对抗 COVID-19。
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引用次数: 0
Study of explicit travelling wave solutions of nonlinear (2 + 1)-dimensional Zoomeron model in mathematical physics 数学物理中非线性(2 + 1)维佐莫伦模型的显式行波解研究
Pub Date : 2024-02-23 DOI: 10.1515/jncds-2023-0068
K. U. Tariq, Jian-Guo Liu, Sana Nisar
This article studeis the nonlinear (2 + 1)-dimensional Zoomeron equation by utilizing the various prominent analytical approaches namely the unified method and the extended hyperbolic function approach. The analysis in the current paper demonstrates the presence of travelling wave solutions. The applied methods are utilized as powerful tools to investigate and solve the model. The results obtained through these analytical methods reveal insightful patterns in the behavior of the Zoomeron equation. The significance of our work lies in the uniqueness of the methods employed. The two methods are applied to systematically analyze the equation, revealing hidden patterns and structures within its solution space. This leads to the discovery of a collection of solitary wave solutions such as kink waves, singular kink waves, periodic waves and dark soliton using contour plots, 3D and 2D graphics. In this article, we definitely prove that as the free parameters change, the wave amplitude changes as well. It is shown that the applied strategies are more effective and may be implemented to a variety of contemporary nonlinear evolution models emerging in mathematical physics.
本文利用各种著名的分析方法,即统一法和扩展双曲函数法,研究了非线性(2 + 1)维佐莫伦方程。本文的分析证明了行波解的存在。所应用的方法是研究和求解模型的有力工具。通过这些分析方法得出的结果揭示了佐默龙方程行为中的深刻模式。我们工作的意义在于所采用方法的独特性。我们运用这两种方法对方程进行了系统分析,揭示了方程求解空间中隐藏的模式和结构。这导致我们利用等高线图、三维和二维图形发现了一系列孤波解,如扭结波、奇异扭结波、周期波和暗孤子。在本文中,我们肯定地证明了随着自由参数的变化,波幅也会发生变化。结果表明,所应用的策略更为有效,可用于数学物理中出现的各种当代非线性演化模型。
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引用次数: 0
Oscillatory nonlinear thermal instability in nanoliquid under gravity modulation within Hele-Shaw cell 海尔-肖池内重力调制下纳米液体的振荡非线性热不稳定性
Pub Date : 2024-01-10 DOI: 10.1515/jncds-2023-0047
P. Kiran
Abstract The effect of gravity-field modulation is investigated in a nano liquid-confined Hele-Shaw cell. This study aims to finish the work described in (S. N. Rai, B. S. Bhadauria, K. Anish, and B. K. Singh, “Thermal instability in nanoliquid under four types of magnetic-field modulation within Hele-Shaw cell,” Int. J. Heat Mass Transfer, vol. 145, no. 7, p. 072501, 2023) for oscillatory convection. The existence of the complex Ginzburg-Landau equation (CGLE) model is constrained by the requirement ω2 > 0. The magnetic fluxes in the Hele-shaw cell are governed by CGLE with g-jitter. The quantity of heat-mass transfer is examined in the presence of a g-jitter. In addition, the findings of our research on transport analysis indicate that oscillatory mode is preferable to stationary mode. It is also found that the gravity-driven Hele-Shaw layer has lower transport properties. Further, the transport analysis is compared to previous research and shown to have improved results.
摘要 研究了重力场调制在纳米液体密闭海尔-肖电池中的影响。本研究旨在完成(S. N. Rai, B. S. Bhadauria, K. Anish, and B. K. Singh, "Thermal instability in nanoliquid under four types of magnetic-field modulation within Hele-Shaw cell," Int.J.传热传质,第 145 卷,第 7 期,第 072501 页,2023 年)的振荡对流。复金兹堡-朗道方程(CGLE)模型的存在受限于 ω2 > 0 的要求。研究了存在 g 抖动时的热质传递量。此外,我们的输运分析研究结果表明,振荡模式优于静止模式。研究还发现,重力驱动的 Hele-Shaw 层具有较低的传输特性。此外,我们还将传输分析与之前的研究进行了比较,结果表明传输分析得到了改进。
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引用次数: 0
New LMI constraint-based settling-time estimation for finite-time stability of fractional-order neural networks 基于 LMI 约束的新沉淀时间估算,实现分数阶神经网络的有限时间稳定性
Pub Date : 2024-01-09 DOI: 10.1515/jncds-2023-0020
Shafiya Muthu, N. Gnaneswaran
Abstract This study aims to analyze the finite-time stability performance of both non-delayed and delayed fractional-order neural networks. Our primary aim is to investigate the finite-time stability characteristics by introducing a novel inequality designed for estimating the settling time. This fresh inequality serves as the foundation for establishing sufficient criteria, formulated as linear matrix inequalities, which guarantee the finite-time stability of both non-delayed and delayed fractional-order neural networks. Additionally, we underscore the importance of incorporating comprehensive information regarding the lower and upper bounds of the activation function, especially in the context of the proposed non-delayed model. Unlike the previous works, in this paper, the linear matrix inequality technique has been adopted towards the finite-time stability behavior of the proposed model. At last, some numerical examples are examined to validate the efficacy and conservatism of the presented approach and established theoretical results over the existing literature.
摘要 本研究旨在分析非延迟和延迟分数阶神经网络的有限时间稳定性能。我们的主要目的是通过引入一个新的不等式来研究有限时间稳定性特征,该不等式旨在估算沉淀时间。这种新的不等式是建立充分标准的基础,这些充分标准被表述为线性矩阵不等式,可保证非延迟和延迟分数阶神经网络的有限时间稳定性。此外,我们还强调了纳入有关激活函数下限和上限的综合信息的重要性,尤其是在所提出的非延迟模型中。与前人的研究不同,本文采用了线性矩阵不等式技术来研究模型的有限时间稳定性。最后,本文通过一些数值实例验证了本文提出的方法的有效性和保守性,以及与现有文献相比所建立的理论结果。
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引用次数: 0
Fuzzy neutral fractional integro-differential equation existence and stability results involving the Caputo fractional generalized Hukuhara derivative 涉及卡普托分式广义赫库哈拉导数的模糊中性分式积分微分方程存在性和稳定性结果
Pub Date : 2024-01-09 DOI: 10.1515/jncds-2023-0059
Aziz El Ghazouani, Fouad Ibrahim Abdou Amir, M. Elomari, Said Melliani
Abstract In this paper, we investigate the existence and uniqueness solutions for a fuzzy Neutral fractional integro-differential equation with non-local conditions. First, we show the existence of solutions with the help of the Non-linear alternative for one-value function, as well as Krasnoselskii’s and Banach’s fixed point theorems. Moreover, we examine the generalized Ulam Hyers (GUH) and Ulam Hyers Rassias stability for our main problem. Finally, an example is presented to show the usability of our major results.
摘要 本文研究了具有非局部条件的模糊中性分式积分微分方程的存在性和唯一性解。首先,我们借助单值函数的非线性替代以及 Krasnoselskii 和 Banach 定点定理证明了解的存在性。此外,我们还研究了主要问题的广义乌拉姆海尔斯(GUH)和乌拉姆海尔斯拉西亚斯稳定性。最后,我们将举例说明主要结果的可用性。
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引用次数: 0
期刊
Journal of Nonlinear, Complex and Data Science
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