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Journal of Applied Mathematics and Physics最新文献

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Relativistic Corrections to the Maxwellian Distribution for Astrophysical and Fusion Plasmas 天体物理和聚变等离子体麦克斯韦分布的相对论修正
Journal of Applied Mathematics and Physics Pub Date : 2023-01-01 DOI: 10.4236/jamp.2023.118154
Amaury de Kertanguy
{"title":"Relativistic Corrections to the Maxwellian Distribution for Astrophysical and Fusion Plasmas","authors":"Amaury de Kertanguy","doi":"10.4236/jamp.2023.118154","DOIUrl":"https://doi.org/10.4236/jamp.2023.118154","url":null,"abstract":"We present calculations and improvement inspired by the work of Lorenzo Zaninetti, published in 2020, it concerns a problem whose origin dates back 1911 with so called Maxwell-Jüttner distribution these lies on the Lorentz factor , with . This work uses powerful modern software for a reconstruction of Zaninetti work, which computes with special functions, these are included in the Mathematica software, as by instance Bessel and Meijer G-functions ready to manipulate. A progress is made, it is possible to perform an integral that is not computed in Zaninetti paper. This author connects the correct relativistic probability law: the Maxwell-Jüttner to the synchrotron emissivity with a magnetic B field, this work generalize these results, using the linear Stark effect and deals with an electric field E.","PeriodicalId":15035,"journal":{"name":"Journal of Applied Mathematics and Physics","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136256651","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
Optimal Portfolio Selection with Delay under the Framework of Uncertainty Theory 不确定性理论框架下具有时滞的最优投资组合选择
Journal of Applied Mathematics and Physics Pub Date : 2023-01-01 DOI: 10.4236/jamp.2023.1110187
Jun Long, Sanyun Zeng
{"title":"Optimal Portfolio Selection with Delay under the Framework of Uncertainty Theory","authors":"Jun Long, Sanyun Zeng","doi":"10.4236/jamp.2023.1110187","DOIUrl":"https://doi.org/10.4236/jamp.2023.1110187","url":null,"abstract":"This study focuses on investigating the optimal investment strategy for an optimization problem with delay using the uncertainty theory. The financial market is composed of a risk-free asset and a risk asset with an uncertain price process described by an uncertain differential equation. An optimization problem is assumed that its objective is a nonlinear function of decision variable. By deriving the equation of optimality, an analytical solution is obtained for the optimal delay investment strategy, and the optimal delay value function. Finally, an economic analysis and numerical sensitivity analysis are conducted to evaluate the research results.","PeriodicalId":15035,"journal":{"name":"Journal of Applied Mathematics and Physics","volume":"85 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135053792","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
Switching Control Method for Optimal State Feedback Controller of Nuclear Reactor Power System 核反应堆动力系统最优状态反馈控制器的切换控制方法
Journal of Applied Mathematics and Physics Pub Date : 2023-01-01 DOI: 10.4236/jamp.2023.118159
Airan Dang, Bowen Tu, Xiuchun Luan
{"title":"Switching Control Method for Optimal State Feedback Controller of Nuclear Reactor Power System","authors":"Airan Dang, Bowen Tu, Xiuchun Luan","doi":"10.4236/jamp.2023.118159","DOIUrl":"https://doi.org/10.4236/jamp.2023.118159","url":null,"abstract":"Due to the nonlinearity of the reactor power system, the load tracking situation is closely related to the initial steady-state power and the final steady-state power after the introduction of the state feedback controller. Therefore, when the initial power and the final stable power are determined, the particle swarm optimization algorithm is used to find the optimal controller parameters to minimize the load tracking error. Since there are many combinations of initial stable power and final stable power, it is not possible to find the optimal controller parameters for all combinations, so the neural network is used to take the final stable power and the initial stable power as input, and the optimal controller parameters as the output. This method obtains the optimal state feedback controller switching control method can achieve a very excellent load tracking effect in the case of continuous power change, in the power change time point, the response is fast, in the controller parameter switching time point, the actual power does not fluctuate due to the change of controller parameters.","PeriodicalId":15035,"journal":{"name":"Journal of Applied Mathematics and Physics","volume":"128 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135056481","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
Numerical Study on the Duct Noise Control of Single-Stage Axial Flow Fan with Wave Leading Edge Stator Blade Configurations 波前缘静叶单级轴流风机风道噪声控制数值研究
Journal of Applied Mathematics and Physics Pub Date : 2023-01-01 DOI: 10.4236/jamp.2023.118161
Jianxin Lian, Hang Tong, Liangji Zhang, Weiyang Qiao, Weijie Chen
{"title":"Numerical Study on the Duct Noise Control of Single-Stage Axial Flow Fan with Wave Leading Edge Stator Blade Configurations","authors":"Jianxin Lian, Hang Tong, Liangji Zhang, Weiyang Qiao, Weijie Chen","doi":"10.4236/jamp.2023.118161","DOIUrl":"https://doi.org/10.4236/jamp.2023.118161","url":null,"abstract":"This study focuses on a single-stage axial flow fan, investigating the effect of three kinds of wave leading edge stator blades on its noise reduction. The DDES method and the duct acoustic analogy theory based on the penetrable data surface were used for noise prediction. The results showed that the three kinds of wave leading edge blades were effective in reducing the rotor-stator interaction tonal noise and also have a certain inhibitory effect on broadband noise. The A10W15 stator blade can effectively reduce broadband noise in the frequency range of 2200 - 4200 Hz. When the amplitude is increased to 20, the noise reduction effect is further enhanced. However, when the amplitude is increased to 30, the broadband noise reduction effect is no longer significant. Further research shows that the wave leading edge stator blades can significantly change the pressure fluctuation distribution on the leading edge and suction surface, which control the modal energy distribution. Finally, this paper analyzed multiple factors affecting the broadband noise reduction, such as the noise source cut-off and cut-on effect and correlation. The purpose of this paper is to explore the laws of the influence of wave leading edge blades on the duct noise of real fan, and to reveal its noise control mechanism.","PeriodicalId":15035,"journal":{"name":"Journal of Applied Mathematics and Physics","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135056482","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
Frequency-Domain Wideband Acoustic Noise Cancellation System 频域宽带噪声消除系统
Journal of Applied Mathematics and Physics Pub Date : 2023-01-01 DOI: 10.4236/jamp.2023.118163
Karaseva Vera Andreevna, Lvov Aleksey Vital’evich, Rodionov Aleksandr Alekseevich
{"title":"Frequency-Domain Wideband Acoustic Noise Cancellation System","authors":"Karaseva Vera Andreevna, Lvov Aleksey Vital’evich, Rodionov Aleksandr Alekseevich","doi":"10.4236/jamp.2023.118163","DOIUrl":"https://doi.org/10.4236/jamp.2023.118163","url":null,"abstract":"When building an adaptive noise cancellation system for wideband acoustic signals, one can meet some difficulties in practical implementation of such a system. The major problem is related to the necessity of using real-time signal generation and processing. In this paper the active noise control system which utilizes adaptation in frequency domain is considered. It is shown that the proposed algorithms simplify practical implementation of a noise cancellation system. The results of computer simulations and prototype experiments show the effectiveness of the proposed methods.","PeriodicalId":15035,"journal":{"name":"Journal of Applied Mathematics and Physics","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135056487","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
Adaptive Stochastic Synchronization of Uncertain Delayed Neural Networks 不确定延迟神经网络的自适应随机同步
Journal of Applied Mathematics and Physics Pub Date : 2023-01-01 DOI: 10.4236/jamp.2023.119164
Enli Wu, Yao Wang, Fei Luo
{"title":"Adaptive Stochastic Synchronization of Uncertain Delayed Neural Networks","authors":"Enli Wu, Yao Wang, Fei Luo","doi":"10.4236/jamp.2023.119164","DOIUrl":"https://doi.org/10.4236/jamp.2023.119164","url":null,"abstract":"This paper considers adaptive synchronization of uncertain neural networks with time delays and stochastic perturbation. A general adaptive controller is designed to deal with the difficulties deduced by uncertain parameters and stochastic perturbations, in which the controller is less conservative and optimal since its control gains can be automatically adjusted according to some designed update laws. Based on Lyapunov stability theory and Barbalat lemma, sufficient condition is obtained for synchronization of delayed neural networks by strict mathematical proof. Moreover, the obtained results of this paper are more general than most existing results of certainly neural networks with or without stochastic disturbances. Finally, numerical simulations are presented to substantiate our theoretical results.","PeriodicalId":15035,"journal":{"name":"Journal of Applied Mathematics and Physics","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134888711","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
Nonstandard Unitary Transformations of Quantum States 量子态的非标准幺正变换
Journal of Applied Mathematics and Physics Pub Date : 2023-01-01 DOI: 10.4236/jamp.2023.119166
Gombojav O. Ariunbold
{"title":"Nonstandard Unitary Transformations of Quantum States","authors":"Gombojav O. Ariunbold","doi":"10.4236/jamp.2023.119166","DOIUrl":"https://doi.org/10.4236/jamp.2023.119166","url":null,"abstract":"In quantum optics, unitary transformations of arbitrary states are evaluated by using the Taylor series expansion. However, this traditional approach can become cumbersome for the transformations involving non-commuting operators. Addressing this issue, a nonstandard unitary transformation technique is highlighted here with new perspective. In a spirit of “quantum” series expansions, the transition probabilities between initial and final states, such as displaced, squeezed and other nonlinearly transformed coherent states are obtained both numerically and analytically. This paper concludes that, although this technique is novel, its implementations for more extended systems are needed.","PeriodicalId":15035,"journal":{"name":"Journal of Applied Mathematics and Physics","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135400261","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
Generalized Soft Expert Set and Its Applications 广义软专家集及其应用
Journal of Applied Mathematics and Physics Pub Date : 2023-01-01 DOI: 10.4236/jamp.2023.118156
Xuefang Liu
{"title":"Generalized Soft Expert Set and Its Applications","authors":"Xuefang Liu","doi":"10.4236/jamp.2023.118156","DOIUrl":"https://doi.org/10.4236/jamp.2023.118156","url":null,"abstract":"The expert set theory performs an important part in making decisions. It can successfully convey the opinions of every expert since it includes several experts. In this study, generalizations and soft expert sets are combined. First, the generalized soft expert set notion is presented, then follows the definition of operation approaches and characteristics as the complement, union, intersection, AND and OR. The application of the generalized soft expert set concept to decision issues is then presented with an example. The study also introduces the idea of a generalized soft expert matrix and demonstrates how it may be used to solve decision-making issues. The most striking aspect of this paper is to present the concepts of generalized soft expert sets and generalized soft expert matrices and to apply them to the same decision-making scenario.","PeriodicalId":15035,"journal":{"name":"Journal of Applied Mathematics and Physics","volume":"82 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136299277","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
Unsteady Hydromagnetic Non-Newtonian Nanofluid Flow Past a Porous Stretching Sheet in the Presence of Variable Magnetic Field and Chemical Reaction 非定常磁非牛顿纳米流体在变磁场和化学反应下流过多孔拉伸片
Journal of Applied Mathematics and Physics Pub Date : 2023-01-01 DOI: 10.4236/jamp.2023.119165
Kafunda Tuesday, Mathew N. Kinyanjui, Kang’ethe Giterere
{"title":"Unsteady Hydromagnetic Non-Newtonian Nanofluid Flow Past a Porous Stretching Sheet in the Presence of Variable Magnetic Field and Chemical Reaction","authors":"Kafunda Tuesday, Mathew N. Kinyanjui, Kang’ethe Giterere","doi":"10.4236/jamp.2023.119165","DOIUrl":"https://doi.org/10.4236/jamp.2023.119165","url":null,"abstract":"The aim of this study is to examine the unsteady hydromagnetic flow of non-Newtonian nanofluid past a stretching sheet in the presence of variable magnetic field and chemical reaction. The system of non-linear partial differential equations governing the flow was solved using finite difference numerical approximation method. The resulting numerical schemes were simulated in MATLAB software. Furthermore, the skin-friction coefficient, Sherwood number, and Nusselt number have been presented in tabular form and discussed. The findings demonstrated that increasing Reynolds number increases velocity profiles while increasing permeability parameter, suction parameter and angle of inclination for the applied magnetic field reduces the velocity profiles of the fluid flow. Temperature of the fluid increases as the angle of inclination, magnetic number, Reynolds number and Eckert number increase but decreases as Prandtl number increases. Induced magnetic field profiles decrease as magnetic Prandtl number and suction parameter increase. Concentration profiles decrease as the chemical reaction parameter and Schmidt number increase but increase as the Soret number increases. The study is significant because fluid flow and heat transfer mechanisms with the variable magnetic considerations play an important role in magnetohydrodynamic generator or dynamo and magnetohydrodynamic pumps, nuclear reactors, vehicle thermal control, heat exchangers, cancer therapy, wound treatment and hyperthermia.","PeriodicalId":15035,"journal":{"name":"Journal of Applied Mathematics and Physics","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136208423","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
The Application of Numerical Characteristics to the Distribution Characteristics of Copper in the Liao River, China 数值特征在辽河铜分布特征中的应用
Journal of Applied Mathematics and Physics Pub Date : 2023-01-01 DOI: 10.4236/jamp.2023.117127
Kan Zhang, Xue Feng
{"title":"The Application of Numerical Characteristics to the Distribution Characteristics of Copper in the Liao River, China","authors":"Kan Zhang, Xue Feng","doi":"10.4236/jamp.2023.117127","DOIUrl":"https://doi.org/10.4236/jamp.2023.117127","url":null,"abstract":"The aim of the present investigation was to research the distribution characteristics of copper in water and sediment of the Liao River, China. The concentrations of copper in water and sediment showed significant difference at different sampling stations. The distribution characteristics of copper in water and sediment were obtained by using discrete and continuous numerical characteristics. The results indicated that the average concentrations of copper in water and sediment decreased slightly after its accumulation. While the deviations of the concentrations of copper in water and sediment from the expectation increased significantly after its accumulation. The skewness distributions of the concentrations of copper in water and sediment did not change much before and after its accumulation. The kurtosis distributions of the concentrations of copper in water and sediment decreased significantly after its accumulation. Therefore, the precise distribution characteristics of copper in water and sediment were obtained through the combination of the discrete and continuous numerical characteristics.","PeriodicalId":15035,"journal":{"name":"Journal of Applied Mathematics and Physics","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135733567","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: 1
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