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Optical Wave Phenomena in Birefringent Fibers Described by Space-Time Fractional Cubic-Quartic Nonlinear Schrödinger Equation with the Sense of Beta and Conformable Derivative 时空分数次三次四次非线性Schrödinger方程描述双折射光纤中的光波现象
IF 1.2 4区 物理与天体物理 Q3 PHYSICS, MATHEMATICAL Pub Date : 2022-12-16 DOI: 10.1155/2022/7265164
M. F. Uddin, M. Hafez
The work explores the optical wave solutions along with their graphical representations by proposing the coupled spatial-temporal fractional cubic-quartic nonlinear Schrödinger equation with the sense of two fractal derivatives (beta and conformable derivative) and Kerr law nonlinearity for birefringent fibers. The new extended direct algebraic method for the first time is implemented to achieve this goal. Many optical solutions are listed along with their existence criteria. Based on the existence criteria, the cubic-quartic bright, and singular optical soliton, periodic pulse, and rouge wave profiles are supported in birefringent fibers with the influence of both beta and conformable derivative parameter.
通过提出双折射光纤具有两个分形导数(β和共形导数)和克尔定律非线性的耦合时空分数三次四次非线性Schrödinger方程,研究了光波解及其图形表示。为了实现这一目标,首次提出了一种新的扩展直接代数方法。列出了许多光学解及其存在准则。根据存在准则,在β和共形导数参数的影响下,双折射光纤中支持三次四次亮光孤子、奇异光孤子、周期脉冲和rouge波剖面。
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引用次数: 3
Two-Dimensional Fredholm Integro-Differential Equation with Singular Kernel and Its Numerical Solutions 具有奇异核的二维Fredholm积分微分方程及其数值解
IF 1.2 4区 物理与天体物理 Q3 PHYSICS, MATHEMATICAL Pub Date : 2022-12-08 DOI: 10.1155/2022/2501947
A. M. Al-Bugami
In this paper, we introduce the nonlinear Fredholm integro-differential equation of the second kind with singular kernel in two-dimensional NT-DFIDE. Furthermore, we study this new equation numerically. The existence of a unique solution of the equation is proved. The numerical results of NT-DFIDE are obtained by the following methods: Toeplitz matrix method (TMM) and product Nystrom method (PNM). The given applications showed the efficiency of these methods.
本文在二维NT-DFIDE中引入了一类二阶奇异核的非线性Fredholm积分微分方程。并对该方程进行了数值研究。证明了该方程唯一解的存在性。采用Toeplitz矩阵法(TMM)和product Nystrom法(PNM)对nt - dfid进行了数值计算。给出的应用表明了这些方法的有效性。
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引用次数: 1
Abundant Exact Soliton Solutions of the ( 2 + 1 )-Dimensional Heisenberg Ferromagnetic Spin Chain Equation Based on the Jacobi Elliptic Function Ideas 基于Jacobi椭圆函数思想的(2 + 1)维Heisenberg铁磁自旋链方程的大量精确孤子解
IF 1.2 4区 物理与天体物理 Q3 PHYSICS, MATHEMATICAL Pub Date : 2022-12-03 DOI: 10.1155/2022/7422491
Qinghao Zhu, Jian-ming Qi
The Heisenberg ferromagnetic spin chain equation (HFSCE) is very important in modern magnetism theory. HFSCE expounded the nonlinear long-range ferromagnetic ordering magnetism. Also, it depicts the characteristic of magnetism to many insulating crystals as well as interaction spins. Moreover, the ferromagnetism plays a fundamental role in modern technology and industry and it is principal for many electrical and electromechanical devices such as generators, electric motors, and electromagnets. In this article, the exact solutions of the nonlinear ( 2 + 1 )-dimensional HFSCE are successfully examined by an extended modified version of the Jacobi elliptic expansion method (EMVJEEM). Consequently, much more new Jacobi elliptic traveling wave solutions are found. These new solutions have not yet been reported in the studied models. For the study models, the new solutions are singular solitons not yet observed. Additionally, certain interesting 3D and 2D figures are performed on the obtained solutions. The geometrical representation of the HFSCE provides the dynamical information to explain the physical phenomena. The results will be significant to understand and study the ( 2 + 1 )-dimensional HFSCE. Therefore, further studying EMVJEEM may help researchers to seek for more soliton solutions to other nonlinear differential equations.
海森堡铁磁自旋链方程(HFSCE)在现代磁学理论中占有重要地位。HFSCE阐述了非线性长程铁磁有序磁性。此外,还描述了许多绝缘晶体的磁性特征以及相互作用自旋。此外,铁磁性在现代技术和工业中起着基础作用,它是许多电气和机电设备(如发电机、电动机和电磁铁)的主要成分。本文用Jacobi椭圆展开法(EMVJEEM)的扩展修正版,成功地检验了非线性(2 + 1)维HFSCE的精确解。从而得到了更多新的雅可比椭圆行波解。这些新的解决方案尚未在研究的模型中报道。对于研究模型,新的解是尚未观测到的奇异孤子。此外,对得到的解进行了一些有趣的3D和2D图形。HFSCE的几何表示提供了解释物理现象的动力学信息。这对理解和研究(2 + 1)维的HFSCE具有重要意义。因此,进一步研究EMVJEEM可以帮助研究人员寻找更多的非线性微分方程的孤子解。
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引用次数: 3
Some Exact Solutions to Generalized Kadomtsev-Petviashvili Equation 广义Kadomtsev-Petviashvili方程的一些精确解
IF 1.2 4区 物理与天体物理 Q3 PHYSICS, MATHEMATICAL Pub Date : 2022-11-28 DOI: 10.1155/2022/9882817
Bao Wang, Zhiqiang Chen
Most of the papers have explored the interactions between solitons with a zero background, while reports about exact solutions for nonzero background are rare. Hence, this paper is aimed at exploring the breather, lump, and interaction solutions with a small perturbation to ( 2 + 1 )-dimensional generalized Kadomtsev-Petviashvili (gKP) equation. General high-order periodic breather solutions are obtained using Hirota’s bilinear method with a small perturbation. At the same time, combining the use of long wave limit methods and module resonance constraints, general lump solutions and mixed solutions to gKP equation are generated. Finally, the space-time structures of the breather solutions, lump solutions, and interaction solutions are investigated and discussed.
大多数论文都探讨了零背景孤子之间的相互作用,而关于非零背景孤子的精确解的报道很少。因此,本文旨在探讨(2 + 1)维广义Kadomtsev-Petviashvili (gKP)方程的呼吸解、块解和具有小扰动的相互作用解。利用Hirota的双线性方法得到了具有小扰动的一般高阶周期呼吸解。同时,结合使用长波极限法和模共振约束,得到了gKP方程的一般整体解和混合解。最后,对呼吸解、块解和相互作用解的时空结构进行了研究和讨论。
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引用次数: 0
Coupled Fixed Point Theorem for the Generalized Langevin Equation with Four-Point and Strip Conditions 四点条形条件下广义Langevin方程的耦合不动点定理
IF 1.2 4区 物理与天体物理 Q3 PHYSICS, MATHEMATICAL Pub Date : 2022-11-23 DOI: 10.1155/2022/1724221
A. Salem, Noorah Mshary
By considering a metric space with partially ordered sets, we employ the coupled fixed point type to scrutinize the uniqueness theory for the Langevin equation that included two generalized orders. We analyze our problem with four-point and strip conditions. The description of the rigid plate bounded by a Newtonian fluid is provided as an application of our results. The exact solution of this problem and approximate solutions are compared.
通过考虑具有偏序集的度量空间,我们使用耦合不动点类型来仔细研究包含两个广义阶的Langevin方程的唯一性理论。我们用四个点和条条件来分析我们的问题。作为我们的结果的应用,提供了由牛顿流体界定的刚性板的描述。比较了该问题的精确解和近似解。
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引用次数: 6
A Well-Behaved Anisotropic Strange Star Model 一个行为良好的各向异性奇异星模型
IF 1.2 4区 物理与天体物理 Q3 PHYSICS, MATHEMATICAL Pub Date : 2022-11-18 DOI: 10.1155/2022/7243750
Amos V. Mathias, J. Sunzu
We obtain a new nonsingular exact model for compact stellar objects by using the Einstein field equations. The model is consistent with stellar star with anisotropic quark matter in the absence of electric field. Our treatment considers spacetime geometry which is static and spherically symmetric. Ansatz of a rational form of one of the gravitational potentials is made to generate physically admissible results. The balance of gravitational, hydrostatic, and anisotropic forces within the stellar star is tested by analysing the Tolman-Oppenheimer-Volkoff (TOV) equation. Several stellar objects with masses and radii comparable with observations found in the past are generated. Our model obeys different stability tests and energy conditions. The profiles for the potentials, matter variables, stability, and energy conditions are well behaved.
利用爱因斯坦场方程,我们得到了一个新的致密恒星物体的非奇异精确模型。该模型与夸克物质各向异性的恒星在没有电场的情况下是一致的。我们的处理考虑了静态和球对称的时空几何。对其中一个引力势的有理形式进行了Ansatz,以产生物理上可容许的结果。通过分析托尔曼-奥本海默-沃尔科夫(TOV)方程,测试了恒星内部引力、流体静力和各向异性力的平衡。产生了几个质量和半径与过去观测结果相当的恒星物体。我们的模型遵循不同的稳定性测试和能量条件。势、物质变量、稳定性和能量条件的剖面表现良好。
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引用次数: 2
A Bayesian-Weighted Inverse Gaussian Regression Model with Application to Seismological Data 贝叶斯加权高斯反回归模型在地震资料中的应用
IF 1.2 4区 物理与天体物理 Q3 PHYSICS, MATHEMATICAL Pub Date : 2022-11-17 DOI: 10.1155/2022/3943930
Ehsan Mesdaghi, A. Fallah, R. Farnoosh, G. Yari
Developing an efficient model for analyzing right-skewed positive observations has a long history, and many authors have attempt in this direction. This is because the common analytic modeling procedures such as linear regression are often inappropriate for such data and leads to inadequate results. In this article, we proposed a new model for regression analysis of the right-skewed data by assuming the weighted inverse Gaussian, as a great flexible distribution, for response observations. In the proposed model, the complementary reciprocal of the location parameter of response variable is considered to be a linear function of the explanatory variables. We developed a fully Bayesian framework to infer about the model parameters based on a general noninformative prior structure and employed a Gibbs sampler to derive the posterior inferences by using the Markov chain Monte Carlo methods. A comparative simulation study is worked out to assess and compare the proposed model with other usual competitor models, and it is observed that efficiency is quite satisfactory. A real seismological data set is also analyzed to explain the applicability of the proposed Bayesian model and to access its performance. The results indicate to the more accuracy of proposed regression model in estimation of model parameters and prediction of future observations in comparison to its usual competitors in literature. Particularly, the relative prediction efficiency of the proposed regression model to the inverse Gaussian and log-normal regression models has been obtained to be 1.16 and 64, respectively, for the real-world example discussed in this paper.
建立一个有效的模型来分析右偏正观测值已经有很长的历史了,许多作者都在这个方向上进行了尝试。这是因为常见的分析建模程序,如线性回归,往往不适合这样的数据,导致不充分的结果。在本文中,我们提出了一个新的模型来回归分析右偏数据,假设加权逆高斯分布,作为一个很大的灵活分布,对响应的观察。在该模型中,响应变量的位置参数的互补倒数被认为是解释变量的线性函数。我们开发了一个基于一般非信息先验结构的全贝叶斯框架来推断模型参数,并使用Gibbs采样器通过马尔可夫链蒙特卡罗方法推导后验推断。通过对比仿真研究,对所提出的模型与其他常用的竞争模型进行了评估和比较,结果表明,该模型的效率是令人满意的。通过对实际地震数据集的分析,说明了贝叶斯模型的适用性和性能。结果表明,与文献中常用的回归模型相比,该模型在模型参数估计和未来观测值预测方面具有更高的准确性。特别是,对于本文讨论的实际例子,所提出的回归模型相对于高斯逆回归模型和对数正态回归模型的相对预测效率分别为1.16和64。
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引用次数: 0
Financial Futures Prediction Using Fuzzy Rough Set and Synthetic Minority Oversampling Technique 基于模糊粗糙集和合成少数派过采样技术的金融期货预测
IF 1.2 4区 物理与天体物理 Q3 PHYSICS, MATHEMATICAL Pub Date : 2022-11-16 DOI: 10.1155/2022/7622906
Shangkun Deng, Yingke Zhu, Rui-Zhe Liu, Wanyu Xu
In this research, a novel approach called SMOTE-FRS is proposed for movement prediction and trading simulation of the Chinese Stock Index 300 (CSI300) futures, which is the most crucial financial futures in the Chinese A-share market. First, the SMOTE- (Synthetic Minority Oversampling Technique-) based method is employed to address the sample unbalance problem by oversampling the minority class and undersampling the majority class of the futures price change. Then, the FRS- (fuzzy rough set-) based method, as an efficient tool for analyzing complex and nonlinear information with high noise and uncertainty of financial time series, is adopted for the price change multiclassification of the CSI300 futures. Next, based on the multiclassification results of the futures price movement, a trading strategy is developed to execute a one-year simulated trading for an out-of-sample test of the trained model. From the experimental results, it is found that the proposed method averagely yielded an accumulated return of 6.36%, a F1-measure of 65.94%, and a hit ratio of 62.39% in the four testing periods, indicating that the proposed method is more accurate and more profitable than the benchmarks. Therefore, the proposed method could be applied by the market participants as an alternative prediction and trading system to forecast and trade in the Chinese financial futures market.
在本研究中,提出了一种新的方法SMOTE-FRS,用于中国股指300(CSI300)期货的走势预测和交易模拟,CSI300是中国a股市场上最重要的金融期货。首先,采用基于SMOTE(Synthetic Minority Oversampling Technique-)的方法,通过对期货价格变化的少数类进行过采样和对多数类进行欠采样来解决样本不平衡问题。然后,将基于模糊粗糙集的方法作为分析金融时间序列中具有高噪声和不确定性的复杂非线性信息的有效工具,用于CSI300期货的价格变化多分类。接下来,基于期货价格波动的多分类结果,开发了一种交易策略,以执行为期一年的模拟交易,对训练模型进行样本外测试。实验结果表明,该方法在四个测试周期内平均获得了6.36%的累积回报,65.94%的F1测度,62.39%的命中率,表明该方法比基准方法更准确、更有利可图。因此,所提出的方法可以被市场参与者用作中国金融期货市场预测和交易的替代预测和交易系统。
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引用次数: 2
Analysis of Two-Dimensional Heat Transfer Problem Using the Boundary Integral Equation 用边界积分方程分析二维传热问题
IF 1.2 4区 物理与天体物理 Q3 PHYSICS, MATHEMATICAL Pub Date : 2022-11-14 DOI: 10.1155/2022/1889774
Nimona Ketema Kebeba, Gizaw Debito Haifo
In this paper, we examine the problem of two-dimensional heat equations with certain initial and boundary conditions being considered. In a two-dimensional heat transport problem, the boundary integral equation technique was applied. The problem is expressed by an integral equation using the fundamental solution in Green’s identity. In this study, we transform the boundary value problem for the steady-state heat transfer problem into a boundary integral equation and drive the solution of the two-dimensional heat transfer problem using the boundary integral equation for the mixed boundary value problem by using Green’s identity and fundamental solution.
在本文中,我们研究了考虑某些初始条件和边界条件的二维热方程的问题。在二维热传输问题中,应用了边界积分方程技术。这个问题用格林恒等式的基本解表示为一个积分方程。在本研究中,我们将稳态传热问题的边值问题转化为边界积分方程,并利用格林恒等式和基本解,利用混合边值问题的边界积分方程来驱动二维传热问题的求解。
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引用次数: 0
Radiative and MHD Effects on Time-Dependent Thermal-Material Transfer by Micropolar Binary Mixture 微极性二元混合物随时间变化的热材料传递的辐射和MHD效应
IF 1.2 4区 物理与天体物理 Q3 PHYSICS, MATHEMATICAL Pub Date : 2022-11-10 DOI: 10.1155/2022/2224435
Md. Mosharrof Hossain, R. Nasrin, M. Hasanuzzaman
Radiation is an important branch of thermal engineering which includes geophysical thermal insulation, ground water pollution, food processing, cooling of electronic components, oil recovery processes etc. An analysis of unsteady magneto-convective heat-mass transport by micropolar binary mixture of fluid passing a continuous permeable surface with thermal radiation effect has been introduced in this paper. The governing equations are transformed into coupled ordinary differential equations along with Boussinesq approximation by imposing the similarity analysis. Applying the shooting technique, the obtained non-linear coupled similarity equations are solved numerically with the help of “ODE45 MATLAB” software. The results of the numerical solutions to the problem involving velocity, temperature, concentration and micro-rotation are presented graphically for different dimensionless parameters and numbers encountered. With an increase of suction parameter, the velocity distributions very closed to the inclined permeable wall decrease slightly where 0 ≤ η ≤ 0.3 . But for the uplifting values of sunction, both micro-rotation profile and species concentration enhance through the boundary layer. The skin-friction coefficient increases about 61%, 13%, 27% for rising values of Prandtl number (0.71-7), radiation effect (0 - 1) and thermal Grashof number (5-10), respectively, but an adverse effect is observed for magnetic field (1 - 4), inclined angle 0 0 − 60 0 and Schmidt number (0.22 - 0.75). Heat transfer and mass transfer reduce about 82%, 53%, respectively, in increasing of Pr (0.71-1) and 36%, 11%, respectively, in increasing of thermal radiation (0 - 1). The surface couple stress increases about 26%, 49%, 64% and 30% with the increasing values of magnetic field (1-4), inclination angle 0 0 − 60 0 , suction (0-1) and Schmidt number (0.22-0.75), respectively. Finally, the present study has been compared with the earlier published results. It is observed that the comparison bears a good agreement.
辐射是热能工程的一个重要分支,包括地球物理隔热、地下水污染、食品加工、电子元件冷却、采油工艺等。本文分析了具有热辐射效应的微极二元流体混合物通过连续渗透表面的非定常磁对流热质传输。通过相似性分析,将控制方程与Boussinesq近似转化为耦合常微分方程。应用射击技术,利用“ODE45MATLAB”软件对得到的非线性耦合相似方程进行了数值求解。对于遇到的不同无量纲参数和数值,用图形表示了速度、温度、浓度和微旋转问题的数值解的结果。随着吸力参数的增加,在0≤η≤0.3时,非常靠近倾斜渗透壁的速度分布略有减小。但对于太阳活动的抬升值,微旋剖面和物种浓度都通过边界层增强。普朗特数(0.71-7)、辐射效应(0-1)和热格拉绍夫数(5-10)的增加分别使皮肤摩擦系数增加约61%、13%和27%,但磁场(1-4)、倾角0 0−60 0和施密特数(0.22-0.75)则产生不利影响。传热和传质分别减少约82%、53%,Pr(0.71-1)的增加和热辐射(0-1)的增加分别为36%和11%。随着磁场(1-4)、倾角0−60 0、吸力(0-1)和施密特数(0.22-0.75)的增加,表面耦合应力分别增加约26%、49%、64%和30%。最后,将本研究与先前发表的结果进行了比较。据观察,这种比较结果是一致的。
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引用次数: 2
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Advances in Mathematical Physics
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