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Journal of the Egyptian Mathematical Society最新文献

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Hasimoto surfaces in Galilean space (G_{3}) 伽利略空间中的桥本曲面 (G_{3})
Journal of the Egyptian Mathematical Society Pub Date : 2021-02-10 DOI: 10.1186/s42787-021-00113-y
M. Elzawy
{"title":"Hasimoto surfaces in Galilean space (G_{3})","authors":"M. Elzawy","doi":"10.1186/s42787-021-00113-y","DOIUrl":"https://doi.org/10.1186/s42787-021-00113-y","url":null,"abstract":"In this article Hasimoto surfaces in Galilean space $$G_{3}$$ will be considered, Gauss curvature (K) and Mean curvature (H) of Hasimoto surfaces $$chi =chi (s,t)$$ will be investigated, some characterization of s-curves and t-curves of Hasimoto surfaces in Galilean space $$G_{3}$$ will be introduced. Example of Hasimoto surfaces will be illustrated.","PeriodicalId":33345,"journal":{"name":"Journal of the Egyptian Mathematical Society","volume":"309 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138505120","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: 6
The influence of density in population dynamics with strong and weak Allee effect 密度对种群动态的影响与强弱狭缝效应
Journal of the Egyptian Mathematical Society Pub Date : 2021-02-04 DOI: 10.1186/s42787-021-00114-x
Kamrun N. Keya, M. Kamrujjaman, Md. Shafiqul Islam
{"title":"The influence of density in population dynamics with strong and weak Allee effect","authors":"Kamrun N. Keya, M. Kamrujjaman, Md. Shafiqul Islam","doi":"10.1186/s42787-021-00114-x","DOIUrl":"https://doi.org/10.1186/s42787-021-00114-x","url":null,"abstract":"","PeriodicalId":33345,"journal":{"name":"Journal of the Egyptian Mathematical Society","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1186/s42787-021-00114-x","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47308942","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: 5
The cordiality of the sum and union of two fourth power of paths and cycles 路径与循环的两次四次幂的和与并的亲切性
Journal of the Egyptian Mathematical Society Pub Date : 2021-01-29 DOI: 10.1186/s42787-020-00111-6
Ashraf Elrokh, Aya Rabie
{"title":"The cordiality of the sum and union of two fourth power of paths and cycles","authors":"Ashraf Elrokh, Aya Rabie","doi":"10.1186/s42787-020-00111-6","DOIUrl":"https://doi.org/10.1186/s42787-020-00111-6","url":null,"abstract":"A simple graph is called cordial if it has 0-1 labeling that satisfies certain conditions. In this paper, we examine the necessary and sufficient conditions for cordial labeling of the sum and union of two fourth power of paths and cycles.\u0000","PeriodicalId":33345,"journal":{"name":"Journal of the Egyptian Mathematical Society","volume":"65 19","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138505124","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 periodic rotary motions of a rigid body in a new domain of angular velocity 在新的角速度域中刚体的周期旋转运动
Journal of the Egyptian Mathematical Society Pub Date : 2021-01-14 DOI: 10.1186/s42787-020-00112-5
A. I. Ismail
{"title":"The periodic rotary motions of a rigid body in a new domain of angular velocity","authors":"A. I. Ismail","doi":"10.1186/s42787-020-00112-5","DOIUrl":"https://doi.org/10.1186/s42787-020-00112-5","url":null,"abstract":"In the previous works, the limiting case for the motion of a rigid body about a fixed point in a Newtonian force field, which comes from a gravity center lies on Z -axis, is solved. The authors apply the small parameter technique which is achieved giving the body a sufficiently large angular velocity component r o about the fixed z -axis of the body. The periodic solutions of motion are obtained in neighborhood r o tends to $$infty$$ ∞ . In our work, we aim to find periodic solutions to the problem of motion in the neighborhood of r 0 tends to $$0$$ 0 . So, we give a new assumption that: r o is sufficiently small. Under this assumption, we must achieve a large parameter and search for another technique for solving this problem. This technique is named; a large parameter technique instead of the small one well known previously. We see the advantage of the new technique which appears in saving high energy used to begin the motion and give the solution of the problem in another domain. The obtained solutions by the new technique depend on r o . We consider that the center of mass of this body does not necessarily coincide with the fixed point O. We reduce the six nonlinear differential equations of the body and their three first integrals to a quasilinear autonomous system of two degrees of freedom and one first integral. We solve the rational case when the frequencies of the generating system are rational except $$(,omega = ,1,,2,1/2,3,1/3, ldots )$$ ( ω = 1 , 2 , 1 / 2 , 3 , 1 / 3 , … ) under the condition $$gamma^{primeprime}_{0} = cos theta_{o} approx 0$$ γ 0 ″ = cos θ o ≈ 0 . We use the fourth-order Runge–Kutta method to find the periodic solutions in the closed interval of the time t and to compare the analytical method with the numerical one.","PeriodicalId":33345,"journal":{"name":"Journal of the Egyptian Mathematical Society","volume":"64 19","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138505114","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
Melting heat transfer assessment on magnetic nanofluid flow past a porous stretching cylinder 磁性纳米流体通过多孔拉伸圆柱体的熔融传热评估
Journal of the Egyptian Mathematical Society Pub Date : 2021-01-07 DOI: 10.1186/s42787-020-00109-0
Khilap Singh, Alok Kumar Pandey, Manoj Kumar
{"title":"Melting heat transfer assessment on magnetic nanofluid flow past a porous stretching cylinder","authors":"Khilap Singh, Alok Kumar Pandey, Manoj Kumar","doi":"10.1186/s42787-020-00109-0","DOIUrl":"https://doi.org/10.1186/s42787-020-00109-0","url":null,"abstract":"The assessment of melting heat transfer and non-uniform heat source on magnetic Cu–H 2 O nanofluid flow through a porous cylinder was studied. The transformed differential equations describing the motion of Cu–H 2 O fluid together with pertinent boundary conditions were handled numerically with the assistance of Keller box method. The ranges of volume fraction of copper particles were taken as 0–25%. The impacts of various governing parameters on the physical measures such as Nusselt number, surface drag force, temperature and velocity were analyzed by representing through graphs and tables. It was noted that the flow was influenced accordingly with the governing parameters. The outcomes showed that the rate of heat exchange improved with elevated Reynolds number, space and temperature-dependent internal heat source and melting parameters. The comparison of our data in relation to those of previous works has been shown.","PeriodicalId":33345,"journal":{"name":"Journal of the Egyptian Mathematical Society","volume":"289 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138505141","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: 2
Diffusion-thermo and thermal-diffusion effects with inclined magnetic field on unsteady MHD slip flow over a permeable vertical plate 倾斜磁场对可渗透垂直板上非定常MHD滑动流动的扩散-热和热-扩散效应
Journal of the Egyptian Mathematical Society Pub Date : 2020-12-01 DOI: 10.1186/s42787-020-00110-7
T. Oyekunle, S. Agunbiade
{"title":"Diffusion-thermo and thermal-diffusion effects with inclined magnetic field on unsteady MHD slip flow over a permeable vertical plate","authors":"T. Oyekunle, S. Agunbiade","doi":"10.1186/s42787-020-00110-7","DOIUrl":"https://doi.org/10.1186/s42787-020-00110-7","url":null,"abstract":"","PeriodicalId":33345,"journal":{"name":"Journal of the Egyptian Mathematical Society","volume":"28 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1186/s42787-020-00110-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"65797163","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: 7
Sensitivity and mathematical model analysis on secondhand smoking tobacco 二手烟的敏感性及数学模型分析
Journal of the Egyptian Mathematical Society Pub Date : 2020-12-01 DOI: 10.1186/s42787-020-00108-1
Birliew Fekede, Benyam Mebrate
{"title":"Sensitivity and mathematical model analysis on secondhand smoking tobacco","authors":"Birliew Fekede, Benyam Mebrate","doi":"10.1186/s42787-020-00108-1","DOIUrl":"https://doi.org/10.1186/s42787-020-00108-1","url":null,"abstract":"In this paper, we are concerned with a mathematical model of secondhand smoker. The model is biologically meaningful and mathematically well posed. The reproductive number $$R_{0}$$ R 0 is determined from the model, and it measures the average number of secondary cases generated by a single primary case in a fully susceptible population. If $$R_{0}<1,$$ R 0 < 1 , the smoking-free equilibrium point is stable, and if $$R_{0}>1,$$ R 0 > 1 , endemic equilibrium point is unstable. We also provide numerical simulation to show stability of equilibrium points. In addition, sensitivity analysis of parameters involving in the dynamic system of the proposed model has been included. The parameters involving in reproductive number measure the relative change in $$R_{0}$$ R 0 when the value of the parameter changes.","PeriodicalId":33345,"journal":{"name":"Journal of the Egyptian Mathematical Society","volume":"63 20","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138505115","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: 4
On $$psi _{{mathcal{H}}}( . )$$-operator in weak structure spaces with hereditary classes 具有遗传类的弱结构空间中的$$psi _{{mathcal{H}}}( . )$$ -算子
Journal of the Egyptian Mathematical Society Pub Date : 2020-11-06 DOI: 10.1186/s42787-020-00107-2
H. M. Abu-Donia, Rodyna A. Hosny
{"title":"On $$psi _{{mathcal{H}}}( . )$$-operator in weak structure spaces with hereditary classes","authors":"H. M. Abu-Donia, Rodyna A. Hosny","doi":"10.1186/s42787-020-00107-2","DOIUrl":"https://doi.org/10.1186/s42787-020-00107-2","url":null,"abstract":"Weak structure space (briefly, wss ) has master looks, when the whole space is not open, and these classes of subsets are not closed under arbitrary unions and finite intersections, which classify it from typical topology. Our main target of this article is to introduce $$psi _{{mathcal {H}}}(.)$$ ψ H ( . ) -operator in hereditary class weak structure space (briefly, $${mathcal {H}}wss$$ H w s s ) $$(X, w, {mathcal {H}})$$ ( X , w , H ) and examine a number of its characteristics. Additionally, we clarify some relations that are credible in topological spaces but cannot be realized in generalized ones. As a generalization of w -open sets and w -semiopen sets, certain new kind of sets in a weak structure space via $$psi _{{mathcal {H}}}(.)$$ ψ H ( . ) -operator called $$psi _{{mathcal {H}}}$$ ψ H -semiopen sets are introduced. We prove that the family of $$psi _{{mathcal {H}}}$$ ψ H -semiopen sets composes a supra-topology on X . In view of hereditary class $${mathcal {H}}_{0}$$ H 0 , $$w T_{1}$$ w T 1 -axiom is formulated and also some of their features are investigated.","PeriodicalId":33345,"journal":{"name":"Journal of the Egyptian Mathematical Society","volume":"63 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138505119","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
An asymptotic model for solving mixed integral equation in some domains 求解某些域中混合积分方程的一个渐近模型
Journal of the Egyptian Mathematical Society Pub Date : 2020-11-04 DOI: 10.1186/s42787-020-00106-3
M. Abdou, Hamed Kamal Awad
{"title":"An asymptotic model for solving mixed integral equation in some domains","authors":"M. Abdou, Hamed Kamal Awad","doi":"10.1186/s42787-020-00106-3","DOIUrl":"https://doi.org/10.1186/s42787-020-00106-3","url":null,"abstract":"","PeriodicalId":33345,"journal":{"name":"Journal of the Egyptian Mathematical Society","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1186/s42787-020-00106-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47241847","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: 2
L-fuzzy pre-proximities, L-fuzzy filters and L-fuzzy grills L-fuzzy预逼近、L-fuzzy滤波器和L-fuzzy栅格
Journal of the Egyptian Mathematical Society Pub Date : 2020-10-23 DOI: 10.1186/s42787-020-00105-4
A. Ramadan, M. Usama, A. A. Abd El-Latif
{"title":"L-fuzzy pre-proximities, L-fuzzy filters and L-fuzzy grills","authors":"A. Ramadan, M. Usama, A. A. Abd El-Latif","doi":"10.1186/s42787-020-00105-4","DOIUrl":"https://doi.org/10.1186/s42787-020-00105-4","url":null,"abstract":"","PeriodicalId":33345,"journal":{"name":"Journal of the Egyptian Mathematical Society","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1186/s42787-020-00105-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45990623","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: 2
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