Pub Date : 2022-12-01DOI: 10.21608/njbs.2022.278086
Yasmeen Elfarhaty , Ali M. Elazly, E. Gomaa
The electrochemical behavior was studied for SeO2 in the absence and presence of Succinic acid (SuA) and Dithizone (DT) separately in 0.1M KCl solution. The Gold electrode was prepared in our laboratory from gold wire 18K. The Gold wire was polished in Al2O3 piece put in woolen cloth and good washed. Gold electrode was used as working electrode for measuring the voltammograms of SeO2 in 0.1M KCl at 18°C. Stability constant and Gibbs free energy of interaction for SeO2 + Succinic acid and SeO2 + Succinic acid + Dithizone (DT) was done and their values were discussed.
{"title":"Aqueous Complexation for the Interaction of SeO2 with both Succinic acid and Dithizone in KCl Solution (Cyclic Voltammetry) Using Gold Working Electrode (GWE)","authors":"Yasmeen Elfarhaty , Ali M. Elazly, E. Gomaa","doi":"10.21608/njbs.2022.278086","DOIUrl":"https://doi.org/10.21608/njbs.2022.278086","url":null,"abstract":"The electrochemical behavior was studied for SeO2 in the absence and presence of Succinic acid (SuA) and Dithizone (DT) separately in 0.1M KCl solution. The Gold electrode was prepared in our laboratory from gold wire 18K. The Gold wire was polished in Al2O3 piece put in woolen cloth and good washed. Gold electrode was used as working electrode for measuring the voltammograms of SeO2 in 0.1M KCl at 18°C. Stability constant and Gibbs free energy of interaction for SeO2 + Succinic acid and SeO2 + Succinic acid + Dithizone (DT) was done and their values were discussed.","PeriodicalId":210317,"journal":{"name":"Nile Journal of Basic Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114093966","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}
Pub Date : 2022-12-01DOI: 10.21608/njbs.2022.277266
E. Ziada
In this paper, we apply the Adomian decomposition method (ADM) for solving linear and nonlinear ordinary differential equations (ODEs). The existence and uniqueness of the solution are proved. The convergence of the series solution and the error analysis are discussed. Some applications are solved such as relaxation-oscillation equation.
{"title":"Solution of Ordinary Differential Equations Using Adomian Decomposition Method","authors":"E. Ziada","doi":"10.21608/njbs.2022.277266","DOIUrl":"https://doi.org/10.21608/njbs.2022.277266","url":null,"abstract":"In this paper, we apply the Adomian decomposition method (ADM) for solving linear and nonlinear ordinary differential equations (ODEs). The existence and uniqueness of the solution are proved. The convergence of the series solution and the error analysis are discussed. Some applications are solved such as relaxation-oscillation equation.","PeriodicalId":210317,"journal":{"name":"Nile Journal of Basic Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125490956","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}
Pub Date : 2022-12-01DOI: 10.21608/njbs.2022.277270
E. Ziada
In this paper, we apply the Adomian decomposition method (ADM) for solving linear and nonlinear system of ordinary differential equations (ODEs). The existence and uniqueness of the solution are proved. The convergence of the series solution and the error analysis are discussed. Some numerical examples are solved.
{"title":"Analytical Solution of a System of Ordinary Differential Equations","authors":"E. Ziada","doi":"10.21608/njbs.2022.277270","DOIUrl":"https://doi.org/10.21608/njbs.2022.277270","url":null,"abstract":"In this paper, we apply the Adomian decomposition method (ADM) for solving linear and nonlinear system of ordinary differential equations (ODEs). The existence and uniqueness of the solution are proved. The convergence of the series solution and the error analysis are discussed. Some numerical examples are solved.","PeriodicalId":210317,"journal":{"name":"Nile Journal of Basic Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114975228","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}
Pub Date : 2021-08-01DOI: 10.21608/njbs.2021.202772
E. Ziada
In this paper, we apply the Adomian decomposition method (ADM) to solve Abel integral equation of the first and second kind. Abel integral equation is one the most important equations which appear in a lot of applications.
{"title":"Analytical solution of Abel integral equation","authors":"E. Ziada","doi":"10.21608/njbs.2021.202772","DOIUrl":"https://doi.org/10.21608/njbs.2021.202772","url":null,"abstract":"In this paper, we apply the Adomian decomposition method (ADM) to solve Abel integral equation of the first and second kind. Abel integral equation is one the most important equations which appear in a lot of applications.","PeriodicalId":210317,"journal":{"name":"Nile Journal of Basic Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125550705","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}
Pub Date : 2021-08-01DOI: 10.21608/njbs.2021.202750
A. Abd-El-Hameed, S. El-Hakam, Z. El-Samia
Aqueous solutions of organic contaminant like rhodamine B) is photodegraded under ultraviolet visible light using modified ZnO by MCM-41 as photocatalyst, due to its low costs, use of sunlight, mild reaction conditions, high photochemical reactivity, low environmental toxicity and stability to photocorrosion. ZnO and MCM-41/ZnO photocatalysts with different percentage of MCM41/ZnO (1%, 3%, 5%, and 8%) were prepared by precipitation method. Nanocomposites was synthesized and characterized by X-ray diffraction (XRD).
{"title":"Photocatalytic degradation of rohdamine B by modified zinc oxide catalysts","authors":"A. Abd-El-Hameed, S. El-Hakam, Z. El-Samia","doi":"10.21608/njbs.2021.202750","DOIUrl":"https://doi.org/10.21608/njbs.2021.202750","url":null,"abstract":"Aqueous solutions of organic contaminant like rhodamine B) is photodegraded under ultraviolet visible light using modified ZnO by MCM-41 as photocatalyst, due to its low costs, use of sunlight, mild reaction conditions, high photochemical reactivity, low environmental toxicity and stability to photocorrosion. ZnO and MCM-41/ZnO photocatalysts with different percentage of MCM41/ZnO (1%, 3%, 5%, and 8%) were prepared by precipitation method. Nanocomposites was synthesized and characterized by X-ray diffraction (XRD).","PeriodicalId":210317,"journal":{"name":"Nile Journal of Basic Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116744298","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}
Pub Date : 2021-08-01DOI: 10.21608/njbs.2021.202757
A. Mousa
Natural convection heat transfer from circular solid, hollow and hollow/perforated pin fin arrays with different geometry is studied numerically using ANSYS 16.0. The geometric dependence of heat transfer from heat sinks of solid, hollow and hollow/perforated fins with staggered arrangement, involved on a fixed area heated base plate is discussed. To solve governing equations (mass, momentum and energy), a SIMPLE code is developed using control volume approach. The second order upwind technique is used. The results were performed for a range of Rayleigh number, 9.3×10> Ra> 1.63×10. It presented that the performance of the solid fin heat sink is higher than the hollow ones and Nu for the hollow/perforated fin heat sink is higher than that for the solid fin heat sink. It is also investigated that hollow/perforated fin array with inner-to-outer diameter ratio (Di/Do=1/2) and perforation diameter (dp=6 mm) is the best sample giving the maximum performance and less amount of weight compared to the corresponding solid ones.
{"title":"Numerical Study of Natural Convection Heat Transfer from a Horizontal Plate using Solid, Hollow and Hollow/Perforated Pin Fins","authors":"A. Mousa","doi":"10.21608/njbs.2021.202757","DOIUrl":"https://doi.org/10.21608/njbs.2021.202757","url":null,"abstract":"Natural convection heat transfer from circular solid, hollow and hollow/perforated pin fin arrays with different geometry is studied numerically using ANSYS 16.0. The geometric dependence of heat transfer from heat sinks of solid, hollow and hollow/perforated fins with staggered arrangement, involved on a fixed area heated base plate is discussed. To solve governing equations (mass, momentum and energy), a SIMPLE code is developed using control volume approach. The second order upwind technique is used. The results were performed for a range of Rayleigh number, 9.3×10> Ra> 1.63×10. It presented that the performance of the solid fin heat sink is higher than the hollow ones and Nu for the hollow/perforated fin heat sink is higher than that for the solid fin heat sink. It is also investigated that hollow/perforated fin array with inner-to-outer diameter ratio (Di/Do=1/2) and perforation diameter (dp=6 mm) is the best sample giving the maximum performance and less amount of weight compared to the corresponding solid ones.","PeriodicalId":210317,"journal":{"name":"Nile Journal of Basic Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116129702","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}
Pub Date : 2021-08-01DOI: 10.21608/njbs.2021.202511
E. Ziada
In this paper, we apply the Adomian decomposition method (ADM) for solving linear and nonlinear fractional differential equations (FDEs). The existence and uniqueness of the solution are proved. The convergence of the series solution and the error analysis are discussed. Some applications are solved such as relaxation-oscillation equation, Basset problem and fractional Riccati differential equation.
{"title":"Analytical solution of linear and nonlinear fractional differential equations","authors":"E. Ziada","doi":"10.21608/njbs.2021.202511","DOIUrl":"https://doi.org/10.21608/njbs.2021.202511","url":null,"abstract":"In this paper, we apply the Adomian decomposition method (ADM) for solving linear and nonlinear fractional differential equations (FDEs). The existence and uniqueness of the solution are proved. The convergence of the series solution and the error analysis are discussed. Some applications are solved such as relaxation-oscillation equation, Basset problem and fractional Riccati differential equation.","PeriodicalId":210317,"journal":{"name":"Nile Journal of Basic Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133602028","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}
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