Journal of Applied Mathematics and Physics最新文献_第4页

The Kinematics Performance of Self-Propelled Full Freedom Filament in Wakes of Flow around Cylinder 自行式全自由灯丝在绕缸尾迹中的运动性能

Journal of Applied Mathematics and Physics Pub Date : 2023-01-01 DOI: 10.4236/jamp.2023.1110192

Jiyao Yang, Yun Liu, Guoyi He

{"title":"The Kinematics Performance of Self-Propelled Full Freedom Filament in Wakes of Flow around Cylinder","authors":"Jiyao Yang, Yun Liu, Guoyi He","doi":"10.4236/jamp.2023.1110192","DOIUrl":"https://doi.org/10.4236/jamp.2023.1110192","url":null,"abstract":"In vortex streets, the kinematics performance of self-propelled full freedom filament is closely related to the length and the position of filaments in the flow field. In this paper, the changes of passive propulsion velocity and pressure of full-degree-of-freedom filaments after cylindrical wake were analyzed by 15 sets of experiments when the length and position of filaments were changed. The results show that the propulsive velocity of the filament, it approximately increases first and then decreases with the filament length increasing, and the further away from the center of the cylinder, the smaller the propulsive velocity of the filament. In addition, the longer the filament length and the further it is from the center of the cylinder, the lower the pressure around the filament. Experiments show that filaments without energy input can obtain energy from the surrounding flow field to maintain self-propelled motion. Studying the influence of length and position on the kinematics of filaments is helpful to provide a reference for revealing the hydrodynamic mechanism on passive propulsion process and developing low resistance energy harvesting device in swimming fish movement.","PeriodicalId":15035,"journal":{"name":"Journal of Applied Mathematics and Physics","volume":"105 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":"135060341","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

Lipschitz Regularity of Viscosity Solutions to the Infinity Laplace Equation 无穷拉普拉斯方程黏性解的Lipschitz正则性

Journal of Applied Mathematics and Physics Pub Date : 2023-01-01 DOI: 10.4236/jamp.2023.1110197

Xiao Han, Fang Liu

引用次数: 0

From Black Holes to Information Erasure: Uniting Bekenstein’s Bound and Landauer’s Principle 从黑洞到信息擦除:贝肯斯坦界与兰道尔原理的统一

Journal of Applied Mathematics and Physics Pub Date : 2023-01-01 DOI: 10.4236/jamp.2023.118140

Boris Menin

引用次数: 0

A Numerical Simulation of Air Flow in the Human Respiratory System Based on Lung Model 基于肺模型的人体呼吸系统气流数值模拟

Journal of Applied Mathematics and Physics Pub Date : 2023-01-01 DOI: 10.4236/jamp.2023.118142

Md. Kamrul Hasan, Mahtab U. Ahmmed, Md. Samsul Arefin

引用次数: 0

Explosion Event of Cavitation in Intact Xylem Conduit 完整木质部导管空化的爆炸事件

Journal of Applied Mathematics and Physics Pub Date : 2023-01-01 DOI: 10.4236/jamp.2023.1110183

Xingyue Li, Fanyi Shen, Tiqiao Xiao, Yanling Xue, Li Zhang, Rongfu Gao, Qian Zhang

{"title":"Explosion Event of Cavitation in Intact Xylem Conduit","authors":"Xingyue Li, Fanyi Shen, Tiqiao Xiao, Yanling Xue, Li Zhang, Rongfu Gao, Qian Zhang","doi":"10.4236/jamp.2023.1110183","DOIUrl":"https://doi.org/10.4236/jamp.2023.1110183","url":null,"abstract":"Cavitation in plant conduits only involves two processes of air bubbles: the gradual expansion and elongation, and the explosion event. An explosion event of cavitation, which can only occur in intact conduit at water tension, trigs acoustic (or ultrasound) emission and induces air to diffuse with high speed, simultaneously. Synchrotron X-ray phase contrast microscopy (XPCM) was used to capture cavitation event in intact conduits of leaves of corn and rice. Cavitation events occur in certain areas of leaves and have a certain time frame. Before XPCM experiment, several preliminary experiments were done as follows: 1) Paraffin sections of leaves of different species were observed to select samples and to determine the occurrence area of cavitation event of leaves. 2) The time frame of cavitation occurrence was determined by ultrasonic emission. 3) The water potentials of leaves were determined, to know the water state of the leaves during cavitation. Locked the area and time frame of cavitation event in the leaves, consecutive XPCM images of cavitation process were more easily acquired. The images show that the phenomenon of gas bubble fully filling conduits for an instant took place in intact conduits of detached leaves of corn and rice more easily. It is that the gas diffusing in a moment was caused by the explosion of the air seeds which had entered in the intact conduits of the leaves. For living plants, it is suggested that the explosion event of cavitation is the most important for embolism formation.","PeriodicalId":15035,"journal":{"name":"Journal of Applied Mathematics and Physics","volume":"15 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":"136259504","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

On the Hybrid Model of Nerve Pulse: Mathematical Analysis and Numerical Results 神经脉冲混合模型:数学分析与数值结果

Journal of Applied Mathematics and Physics Pub Date : 2023-01-01 DOI: 10.4236/jamp.2023.118152

Alexander Mengnjo, Jake Leonard Nkeck

{"title":"On the Hybrid Model of Nerve Pulse: Mathematical Analysis and Numerical Results","authors":"Alexander Mengnjo, Jake Leonard Nkeck","doi":"10.4236/jamp.2023.118152","DOIUrl":"https://doi.org/10.4236/jamp.2023.118152","url":null,"abstract":"Amongst the important phenomena in neurophysiology, nerve pulse generation and propagation is fundamental. Scientists have studied this phenomena using mathematical models based on experimental observations on the physiological processes in the nerve cell. Widely used models include: the Hodgkin-Huxley (H-H) model, which is based entirely on the electrical activity of the nerve cell; and the Heimburg and Jackson (H-J), model based on the thermodynamic activity of the nerve cell. These classes of models do not, individually, give a complete picture of the processes that lead to nerve pulse generation and propagation. Recently, a hybrid model proposed by Mengnjo, Dikandé and Ngwa (M-D-N), takes into consideration both the electrical and thermodynamic activities of the nerve cell. In their work, the first three bound states of the model are analytically computed and they showed great resemblance to some of the experimentally observed pulse profiles. With these bound states, the M-D-N model reduces to an initial value problem of a linear parabolic partial differential equation with variable coefficients. In this work we consider the resulting initial value problem and, using the theory of function spaces, propose and prove conditions under which such equations will admit unique solutions. We then verify that the resulting initial value problem from the M-D-N model satisfies these conditions and so has a unique solution. Given that the derived initial value problem is complex and there are no known analytic techniques that can be deployed to obtain its solution, we designed a numerical experiment to estimate the solutions. The simulations revealed that the unique solution is a stable pulse that propagates in the x-t plane with constant velocity and maintains the shape of the initial profile.","PeriodicalId":15035,"journal":{"name":"Journal of Applied Mathematics and Physics","volume":"48 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":"136256642","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

Dynamic Analysis of a Predator-Prey Model with Holling-II Functional Response 具有Holling-II功能响应的捕食者-猎物模型的动态分析

Journal of Applied Mathematics and Physics Pub Date : 2023-01-01 DOI: 10.4236/jamp.2023.1110188

Jiemin Mo, Wanying Li, Donghuan He, Songbo Wang, Xiaoliang Zhou

引用次数: 0

Software for Acoustic Design 声学设计软件

Journal of Applied Mathematics and Physics Pub Date : 2023-01-01 DOI: 10.4236/jamp.2023.118162

Anatoliy Sergeevich Suvorov, Oleg Fedorovich Sevriukov, Evgeniy Mikhailovich Sokov, Mikhail Borisovich Salin, Svetlana Georgievna Zaitseva, Varvara Alekseevna Sharagina

引用次数: 0

Relationship between Whole Body Iodine-131 Effective Half-Life and Estimated Glomerular Filtration Rate for Papillary Thyroid Cancer Patients Undergoing Radioactive Iodine Therapy 放射性碘治疗甲状腺乳头状癌患者全身碘-131有效半衰期与肾小球滤过率的关系

Journal of Applied Mathematics and Physics Pub Date : 2023-01-01 DOI: 10.4236/jamp.2023.118158

Asim Abualnaja, Hanaa Alsheikh, Khaled Soliman, Meshal Alnefaie, Abdulraheem Alsheri

{"title":"Relationship between Whole Body Iodine-131 Effective Half-Life and Estimated Glomerular Filtration Rate for Papillary Thyroid Cancer Patients Undergoing Radioactive Iodine Therapy","authors":"Asim Abualnaja, Hanaa Alsheikh, Khaled Soliman, Meshal Alnefaie, Abdulraheem Alsheri","doi":"10.4236/jamp.2023.118158","DOIUrl":"https://doi.org/10.4236/jamp.2023.118158","url":null,"abstract":"Background: The aim of this work was to examine the relationship between the estimated glomerular filtration rate (eGFR) as indicator of renal efficiency potentially related to the ability to release radioactive iodine from the patients bodies and the radioactive iodine whole body effective half-life (WBEHL) defined as the time taken for the administered activity to decay to half of its value for papillary thyroid cancer (PTC) patients undergoing radioactive iodine therapy (RAIT) in a tertiary care medical Centre. Methods: This retrospective observational study included seventy nine patients, sixty females and nineteen males. The patients were divided in two subgroups, those who have WBEHL of less than 11 hours (n = 51) and those with more than 11 (n = 28) hrs based on k-means clustering technique. Results: Analysis of variance (ANOVA) was used to find out if there is a statistically significant difference between the two subgroups Conclusion: There was not a statistically significant difference between the short and the longer WBEHL patients’ groups analyzed in this study.","PeriodicalId":15035,"journal":{"name":"Journal of Applied Mathematics and Physics","volume":"9 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":"135056488","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

Novel Method to Deal with Interval Quadratic Equations via Sign-Variation Analysis 用变号分析处理区间二次方程的新方法

Journal of Applied Mathematics and Physics Pub Date : 2023-01-01 DOI: 10.4236/jamp.2023.1110208

Nicolas Yvain, Isaac Elishakoff

引用次数: 0