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Alexandria Journal of Science and Technology最新文献

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Geopolymers as sustainable alternates for portland cement in constructive concrete: systematic review 土工聚合物在构造混凝土中作为硅酸盐水泥的可持续替代品：系统综述
Alexandria Journal of Science and Technology Pub Date : 2024-07-22 DOI: 10.21608/ajst.2024.290876.1032
H.A Fetouh
{"title":"Geopolymers as sustainable alternates for portland cement in constructive concrete: systematic review","authors":"H.A Fetouh","doi":"10.21608/ajst.2024.290876.1032","DOIUrl":"https://doi.org/10.21608/ajst.2024.290876.1032","url":null,"abstract":": This systematic review presenting fundamentals of geopolymer (GP) for concrete technology. Geopolymer formulated by activation of sustainable aluminosilicate (minerals) binders (eco-friendly, available, cheap, sustainable natural raw materials fly ash and slag wastes). Geopolymer concrete decrease scarcity of global ordinary Portland cement and decrease energy 0.110 kWh per gram and CO 2(g) emission (800 kg ton -1 ). Durability, mechanical strength, resistance to water and leaching improved via by TiO 2 nanoparticles as nanofiller. Polycondensation yield and physicochemical characteristics of GP are monotonic functions of (binder's chemistry, alkali concentration& types, reinforcing fibers, Si to Al ratio, precursors firing, types of solid wastes, heating activation, types and curing conditions. Concrete quality is controlled by geopolymer (composition, additives, mechanical strength and compressive strength). Nano fillers materials SiO 2 , Fe 2 O 4 and Al 2 O 3 improved (mechanical characteristics, microstructure, functionality, durability, mortar strength, slurry mobility, permeability, impact","PeriodicalId":504746,"journal":{"name":"Alexandria Journal of Science and Technology","volume":"70 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141817593","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 Chitosan Nanoparticles based 1,2,3-triazole moieties as potent drugs against multi-drug resistant bacteria 基于 1,2,3-三唑分子的新型壳聚糖纳米颗粒作为抗多重耐药菌的强效药物
Alexandria Journal of Science and Technology Pub Date : 2024-03-13 DOI: 10.21608/ajst.2024.257728.1024
Heba Mohamed, Bassma H. Elwakil, Mohamed A. Hagar, M. Aouad, N. Rezki, Z. Olama, Y. El Kilany, Mohamed A. Zakaria
{"title":"Novel Chitosan Nanoparticles based 1,2,3-triazole moieties as potent drugs against multi-drug resistant bacteria","authors":"Heba Mohamed, Bassma H. Elwakil, Mohamed A. Hagar, M. Aouad, N. Rezki, Z. Olama, Y. El Kilany, Mohamed A. Zakaria","doi":"10.21608/ajst.2024.257728.1024","DOIUrl":"https://doi.org/10.21608/ajst.2024.257728.1024","url":null,"abstract":": Drug resistance is a major global problem leading to higher morbidity and mortality rates especially among hospitalized patients. Hence, in the present study, 1,2,3-Triazole-acetophnone molecular conjugates 3a-c were resynthesized and then used in nanoformulated composites ( 3a-cCNPs) using chitosan as a matrix to give nano compounds of particle sizes ranging from 20 to 40 nm. Antimicrobial activity of the synthesized compounds and the nanoformulated analogues against some multi-drug resistant microbes revealed that 3bCNPs was the most potent candidate due to its high efficiency against multi-drug resistant (MDR) microbes that reached complete microbial cells eradication after 4 hours. The synthesized nanoparticles","PeriodicalId":504746,"journal":{"name":"Alexandria Journal of Science and Technology","volume":"81 S363","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140393774","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
Laboratory-synthesized biogenic silver nanoparticles (AgNPs) with potential therapeutic applications 具有潜在治疗用途的实验室合成生物银纳米粒子 (AgNPs)
Alexandria Journal of Science and Technology Pub Date : 2024-02-24 DOI: 10.21608/ajst.2024.260958.1025
Fatima Hamed, Hanan Ghozlan, Soraya Sabry, Samia Abouelkhir
{"title":"Laboratory-synthesized biogenic silver nanoparticles (AgNPs) with potential therapeutic applications","authors":"Fatima Hamed, Hanan Ghozlan, Soraya Sabry, Samia Abouelkhir","doi":"10.21608/ajst.2024.260958.1025","DOIUrl":"https://doi.org/10.21608/ajst.2024.260958.1025","url":null,"abstract":". ABSTRACT: This research was planned to isolate a marine bacterium that is able to biosynthesize silver nanoparticles to be used for therapeutic applications. The environmentally friendly production of nanoparticles from biological sources is frequently simple, inexpensive, and free of hazardous chemicals. Silver nanoparticles (AgNPs) are part of a new class of biomaterials that is being created more and more for use in scientific and medical endeavours. Given how important the biological system is, it is essential to have a basic understanding of how inorganic nanoparticles affect cellular development and function. Resazurin, a rapid screening assay, was applied to evaluate the antibacterial effects of the synthesized AgNPs against the pathogenic microbes. The 3-[4,5-dimethylthiazol-2-yl]-2,5 diphenyl tetrazolium bromide (MTT) assay was utilized to test silver nanoparticles for cell cytotoxicity and anticancer activity. Silver nanoparticles (AgNPs) were tested for wound healing effects using a scratch assay on a human epithelial cell line (WISH-CCL-25). Halomonas sp. FSSH, among many isolates successfully biosynthesized silver nanoparticles with interesting properties. The present finding revealed that supernatant of Halomonas sp. FSSH could be effectively used as a reducing agent for the green production of AgNPs. These AgNPs are considered efficient antimicrobial, anticancer, and wound-healing agents without cytotoxic effects .","PeriodicalId":504746,"journal":{"name":"Alexandria Journal of Science and Technology","volume":"11 7","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140434762","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
A constrained problem of a nonlinear functional integral equation subject to the pantograph problem 受电弓问题制约的非线性函数积分方程问题
Alexandria Journal of Science and Technology Pub Date : 2024-01-22 DOI: 10.21608/ajst.2024.257068.1023
Esraa Elghanam, Ahmed M. A. El-Sayed, Mahmoud Elalem
{"title":"A constrained problem of a nonlinear functional integral equation subject to the pantograph problem","authors":"Esraa Elghanam, Ahmed M. A. El-Sayed, Mahmoud Elalem","doi":"10.21608/ajst.2024.257068.1023","DOIUrl":"https://doi.org/10.21608/ajst.2024.257068.1023","url":null,"abstract":": Here we study the existence of solution and its continuous dependence of a constrained problem of a nonlinear functional integral equation subject to a constraint of an initial value problem of a pantograph differential equation. The Hyers-Ulam stability of the problem will be proved.","PeriodicalId":504746,"journal":{"name":"Alexandria Journal of Science and Technology","volume":"70 11-12","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140499200","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
Solvability of an Initial-value Problem of Non-linear Implicit Fractal Differential Equation 非线性隐式分形微分方程初值问题的可解性
Alexandria Journal of Science and Technology Pub Date : 2024-01-17 DOI: 10.21608/ajst.2024.252610.1022
Shaymaa Nasim, Ahmed M. A. El-Sayed, Wagdy El-Sayed
{"title":"Solvability of an Initial-value Problem of Non-linear Implicit Fractal Differential Equation","authors":"Shaymaa Nasim, Ahmed M. A. El-Sayed, Wagdy El-Sayed","doi":"10.21608/ajst.2024.252610.1022","DOIUrl":"https://doi.org/10.21608/ajst.2024.252610.1022","url":null,"abstract":": In this paper we study the initial-value problem of the fractal differential equation","PeriodicalId":504746,"journal":{"name":"Alexandria Journal of Science and Technology","volume":" 706","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139617454","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 a Delay Implicit Functional Integro - Differential Equation 论延迟隐含函数积分--微分方程
Alexandria Journal of Science and Technology Pub Date : 2024-01-16 DOI: 10.21608/ajst.2024.250598.1021
Malak M. S. Ba-Ali
{"title":"On a Delay Implicit Functional Integro - Differential Equation","authors":"Malak M. S. Ba-Ali","doi":"10.21608/ajst.2024.250598.1021","DOIUrl":"https://doi.org/10.21608/ajst.2024.250598.1021","url":null,"abstract":": In this work, we use the De Blasi measure of noncompactness and Darbo fixed point Theorem to study the existence of solutions for an initial value problem of a delay implicit functional integro-differential equation. The sufficient condition for the uniqueness of the solution will be given. The continuous dependence of the unique solution on some data will be studied.","PeriodicalId":504746,"journal":{"name":"Alexandria Journal of Science and Technology","volume":"42 12","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140505992","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
Optimization of the Steel Casting Process Parameters to Control the Longitudinal Facial Crack (LFC) Defect Appearance 优化铸钢工艺参数以控制纵向表面裂纹 (LFC) 缺陷外观
Alexandria Journal of Science and Technology Pub Date : 2024-01-03 DOI: 10.21608/ajst.2024.333736
magdy feshar, Fatma Mahgoub, Ashraf Abdel-Gaber
{"title":"Optimization of the Steel Casting Process Parameters to Control the Longitudinal Facial Crack (LFC) Defect Appearance","authors":"magdy feshar, Fatma Mahgoub, Ashraf Abdel-Gaber","doi":"10.21608/ajst.2024.333736","DOIUrl":"https://doi.org/10.21608/ajst.2024.333736","url":null,"abstract":": The principal aim of this research is to meticulously detect and comprehend the reasons behind the longitudinal facial crack (LFC) defect during the casting of low-carbon, low-manganese flat steel products. The overarching goal is to mitigate the likelihood of the defect occurring by optimizing key process parameters. Even seemingly minor defects are considered unfavorable in the final product due to the substantial manufacturing losses entailing economic repercussions. The research employs a diverse array of techniques, including the utilization of a scanning electron microscope (SEM), energy-dispersive X-ray spectroscopy (EDX), potentiodynamic polarization curve measurements, and electrochemical impedance spectroscopy","PeriodicalId":504746,"journal":{"name":"Alexandria Journal of Science and Technology","volume":"35 26","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139389128","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
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