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Processing of Ceramic Based Nanocomposite Usingα-Al_2O_3 Powder and FeCl_2 Solution as Starting Materials

Journal of Materials Science & Technology 2007年第6期23卷 837-842页

作者： Mohamed M.el-sayed Seleman Department of Materials and Metallurgical Engineering Faculty of Petroleum and Mining EngineeringPost Code 43721SuezEgypt

Alumina-iron nanocomposite powders were prepared by a two-step process. In the first step, α-Al2O3-FeCl2 powder mixture was formed by mixing α-Al2O3 powders with FeCl2 solution followed by drying. In the second step, the FeCl2 in the dry power mixture was selectively reduced to iron particles. A reduction temperature of 750℃ for 15 min in dry H2 was chosen based on the thermodynamic calculations. The concentration of iron in FeCl2 solution was calculated to be 20 vol. pct in the final composite. Two techniques were used to produce composite bulk materials. The Al2O3 nanocomposite powders were divided to two batches. The first batch of the produced mixture was hot pressed at 1400℃ and 27 MPa for 30 min in a graphite die. To study the effect of oxygen on the Al2O3/Fe interface bonding and mechanical properties of the composite, the second batch was heat treated in air at 700℃ for 20 min to partially oxidize the iron particles before hot pressing. Characterization of the composites was undertaken by conventional density measurements, X-ray diffractometry （XRD）, scanning electron microscopy （SEM）, transmission electron microscopy （TEM） and electron probe micro analysis （EPMA）. The suggested processing route （mixing, reduction and hot pressing） produces ceramic-metal nanocomposite much tougher than the pure Al2O3. The fracture strength of the produced Al2O3/Fe nanocomposite is nearly twice that of the pure Al2O3. The presence of spinel phase, FeAl204, as thick layer around the Fe particles in the Al2O3 matrix has a detrimental effect on interfacial bonding between Fe and AI203 and the fracture properties of the composite.

关键词： Ferrous chloride Reduction Alumina-iron nanocomposite Spinel phase

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The recent progress on the bioactive compounds from algal biomass for human health applications

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Food Bioscience 2023年第1期51卷 90-108页

作者： Yang Yang Sedky HAHassan Mukesh Kumar Awasthi Babu Gajendran Monika Sharma Min-Kyu Ji el-sayed salama Department of Occupational and Environmental Health School of Public HealthLanzhou UniversityLanzhou City730000Gansu ProvincePR China Department of Biology College of ScienceSultan Qaboos UniversityMuscat123Oman Botany&Microbiology Department Faculty of ScienceNew Valley UniversityEl-Kharga72511Egypt College of Natural Resources and Environment Northwest A&F UniversityTaicheng Road 3#YanglingShaanxi712100PR China School of Pharmaceutical Sciences Guizhou Medical UniversityGuiyangGuizhou Province550025PR China Environmental Assessment Group Korea Environment InstituteYeongi-gun30147South Korea

The secondary metabolites produced by algae(including macroalgae and microalgae)possess several human health *** bioactive compounds in algae have potential to be used in the medical and pharmaceutical industries for drug *** rapid development of genetic tools and omics approaches has extended the understanding of algal metabolism along with enhanced productivity and improving the properties of bioactive ***,the focus of this review is to discuss the molecular progress on algae for bioactive compound production which includes genomics,transcriptomics,proteomics,and *** comprehensive discussion on multi-omics approaches provides the potential knowledge for future *** structural and functional genomics,application of genetic tools,molecular mechanisms of bioactive compound synthesis,protein modification,and the omics performance of algae at various levels under abiotic stress are *** annotation and identification of key functions are the basis of genomics which provides the comprehensive overview of genetic *** recent development of molecular modifications and their application in algae to produce high-yield bioactive compounds that meet human needs through the optimization of algal target strains are also *** exploration of the molecular mechanisms of bioactive compounds under abiotic stress is of great practical significance to guide the optimization of culture conditions.

关键词： Macroalgae Microalgae Bioactive compounds Omics Abiotic stress

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Solid Waste Management:A MADM Approach Using Fuzzy Parameterized Possibility Single-Valued Neutrosophic Hypersoft Expert Settings

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Computer Modeling in Engineering & Sciences 2025年第1期142卷 531-553页

作者： Tmader Alballa Muhammad Ihsan Atiqe Ur Rahman Noorah Ayed Alsorayea Hamiden Abd el-Wahed Khalifa Department of Mathematics College of SciencesPrincess Nourah bint Abdulrahman UniversityRiyadh11671Saudi Arabia 2 Department of Mathematics University of Management and TechnologyLahore54000Pakistan Department of Mathematics College of ScienceQassim UniversityBuraydah51452Saudi Arabia

The dramatic rise in the number of people living in cities has made many environmental and social problems *** search for a productive method for disposing of solid waste is the most notable of these *** scholars have referred to it as a fuzzy multi-attribute or multi-criteria decision-making problem using various fuzzy set-like approaches because of the inclusion of criteria and anticipated *** goal of the current study is to use an innovative methodology to address the expected uncertainties in the problem of solid waste site *** characteristics(or sub-attributes)that decision-makers select and the degree of approximation they accept for various options can both be indicators of these *** tackle these problems,a novel mathematical structure known as the fuzzy parameterized possibility single valued neutrosophic hypersoft expert set(ρˆ-set),which is initially described,is integrated with a modified version of Sanchez’s *** this,an intelligent algorithm is *** steps of the suggested algorithm are explained with an example that explains *** compatibility of solid waste management sites and systems is discussed,and rankings are established along with detailed justifications for their *** study’s strengths lie in its application of fuzzy parameterization and possibility grading to effectively handle the uncertainties embodied in the parameters’nature and alternative approximations,*** uses specific mathematical formulations to compute the fuzzy parameterized degrees and possibility grades that are missing from the prior *** is simpler for the decisionmakers to look at each option separately because the decision is *** the computed results,it is discovered that they are consistent and dependable because of their preferred properties.

关键词： Hypersoft expert set Sanchez’s method decision making optimization solid waste management possibility grade fuzzy parameterization

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A NEW HYBRIDIZED MIXED WEAK GALERKIN METHOD FOR SECOND-ORDER elLIPTIC PROBLEMS

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Journal of Computational Mathematics 2022年第4期40卷 499-516页

作者： Abdelhamid Zaghdani sayed Sayari Miled el Hajji University of Tunis Boulevard du 9 avril 1939 TunisDepartment of MathematicsEnsitTaha Hussein AvenueMontfleuryTunisTunisia Northern Border University Faculty of Arts and ScienceRafhaP.O.840Saudi Arabia Carthage University Isteub2 Rue de l’Artisanat Charguia 22035 TunisTunisia Department of Mathematics Faculty of SciencesUniversity of JeddahSaudi Arabia ENIT-LAMSINBP.371002 Tunis-Belv´ed`ereTunis El Manar UniversityTunisia

In this paper,a new hybridized mixed formulation of weak Galerkin method is studied for a second order elliptic *** method is designed by approximate some operators with discontinuous piecewise polynomials in a shape regular finite element *** discrete inequalities are presented on discontinuous spaces and optimal order error estimations are *** numerical results are reported to show super convergence and confirm the theory of the mixed weak Galerkin method.

关键词： Weak Galerkin Weak gradient Hybridized mixed finite element method Second order elliptic problems

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The competitive and synergistic effect between adsorption enthalpy and capacity in D_(2)/H_(2)separation of M_(2)(m-dobdc)frameworks

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Chinese Chemical Letters 2021年第11期32卷 3562-3565页

作者： Fan Wu Liqiong Li Yanxi Tan el-sayed M.el-sayed Daqiang Yuan State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China University of the Chinese Academy of Sciences Beijing 100049China College of Chemistry Fuzhou UniversityFuzhou 350108China Chemical Refining Laboratory Refining DepartmentEgyptian Petroleum Research InstituteNasr CityCairo 11727Egypt

Hydrogen isotope separation is a challenging task due to their similar ***,based on the chemical affinity quantum sieve(CAQS)effect,the D_(2)/H_(2)separation performance of M_(2)(m-dobdc)(M=Co,Ni,Mg,Mn;m-dobdc^(4-)=4,6-dioxido-1,3-benzenedicarboxylate),a series of honeycomb-shaped MOFs with high stability and abundant open metal sites,are studied by gases sorption and breakthrough experiments,in which two critical factors,gas uptake and adsorption enthalpy,are taken into *** these MOFs,Co_(2)(m-dobdc)exhibits the longest D_(2)retention time of 180 min/g(H_(2)/D_(2)/Ne:1/1/98)at 77 K because of its second-highest adsorption enthalpy(10.7 kJ/mol for H_(2)and 11.8 kJ/mol for D_(2))and the best sorption capacity(5.22 mmol/g for H_(2)and 5.49 mmol/g for D_(2))under low pressure of 1 kPa and 77 K,which make it a promising material for industrial hydrogen isotope ***,the results indicate that H_(2)and D_(2)capacities under low pressure(about 1 kPa)dominate the final D_(2)/H_(2)separation property of MOFs.

关键词： Breakthrough experiment Open metal sites Hydrogen isotope separation Sorption and separation Chemical affinity quantum sieve

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Bedouin farms in the Saint Katherine mountainous area(South Sinai,Egypt)

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Journal of Mountain Science 2019年第10期16卷 2232-2242页

作者： Kamal H.SHALTOUT Khaled H.el-HAMDI Safaa A.el-MASRY ebrahem M.EID Botany Department Faculty of ScienceTanta UniversityTanta31527Egypt Soil Department Faculty of AgricultureMansoura UniversityMansoura35516Egypt Biology Department College of ScienceKing Khalid UniversityAbha61321P.O.Box9004Saudi Arabia Botany Department Faculty of ScienceKafr El-Sheikh UniversityKafr El-Sheikh33516Egypt

This study aims to assess the natural and cultivated plant species in 26 Bedouin farms in Saint Katherine Protectorate(SKP),identify their soil and water characteristics,and assess the suitability of these farms for the cultivation of some wild medicinal *** farms were selected to represent wide wadis with deep sand and clay deposits,gorge-like wadis covered with rock fragments of different sizes,spot-like oases,and the Al Q’aa *** TWINSPAN(two-way indicator species analysis)and DCA(detrended correspondence analysis)techniques,the 26 farms were classified into 5 groups(Ⅰ-Ⅴ)based on their floristic composition of wild *** groups reflect an elevation gradient among the farms above sea level from a mean of 119 m to a mean of1,865m.A total of 73 wild species were recorded,with47 in groupⅡ(500-1,000 m)and 25 in group V(>1,700 m).The common target species were Artemisia judaica,Acacia tortilis ***,Origanum syriacum *** and Varthemia montana(34.6%-26.9%).The cultivated speciesnumbered 25,with 17 in groupⅡ(500-1,000 m) andⅡin groupⅣ(1,500-1,700 m).The common fruit trees were olive,grape,fig,apple,palm,almond,apricot and pomegranate(73.0%-42.3%).Based on the soil characteristics,13 farms belong to soil class 2that describes good soils with moderate limitations,and 12 belong to soil class 3 that describes moderately good soils,which can be used regularly for crops after proper treatment.

关键词： Agroforestry Saint Katherine Protectorate Wild medicinal plants elevation gradient Multivariate analysis Wadi Feiran

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Synthesis, spectral, optical and anti-inflammatory activity of complexes derived from 2-aminobenzohydrazide with some rare earths

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Journal of Rare Earths 2015年第7期33卷 758-764页

作者： Nasser Mohammed Hosny el sayed A.el Morsy Yousery E.Sherif Chemistry Department Faculty of Science Port-Said University Clinical Pharmacology Department Faculty of Medicine Mansoura University Pharmacology and Therapeutics Department Qassim College of Medicine Qassim University Department of Chemistry Faculty of Science and Arts Taibah University

Three new metal complexes derived from Er（Ⅲ）, Dy（Ⅲ） and Zr（Ⅳ） with 2-aminobenzohydrazide （ABH） were synthesized and characterized by elemental analyses, IR, ^1H-NMR, ES-MS and transmission electron microscopy （TEM）. The morphology and the particle size were determined by TEM. The results showed that the ligand acted as neutral bi-dentate coordinating to the metal ions through the carbonyl oxygen and amidic amino nitrogen. The aromatic amine group remained inert towards coordination. The optical band gap was measured and found to be 3.3, 3.5 and 4.3 eV for Er（Ⅲ）, Dy（Ⅲ） and Zr（Ⅳ）, respectively. The optical band gap values indicated a semi-conducting nature of the investigated complexes. The anti-inflammatory and analgesic activities of the tested compounds were determined and compared with standard meloxicam.

关键词： Er(Ⅲ) Dy(Ⅲ) Zr(Ⅳ) metal complexes optical band gap rare earths

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Evolution of blockchain consensus algorithms: a review on the latest milestones of blockchain consensus algorithms

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Cybersecurity 2024年第3期7卷 80-101页

作者： Ziad Hussein May A.salama Sahar A.el-Rahman electrical Engineering Department Faculty of Engineering-ShoubraBenha UniversityCairoEgypt

Blockchain technology has gained widespread adoption in recent years due to its ability to enable secure and trans-parent record-keeping and data transfer.A critical aspect of blockchain technology is the use of consensus algorithms,which allow distributed nodes in the network to agree on the state of the *** this review paper,we exam-ine various consensus algorithms that are used in blockchain systems,including proof-of-work,proof-of-stake,and hybrid *** go over the trade-offs and factors to think about when choosing a consensus algorithm,such as energy efficiency,decentralization,and *** also look at the strengths and weaknesses of each algorithm as well as their potential impact on the scalability and adoption of blockchain technology.

关键词： Blockchain Consensus Proof of work Proof of stake Decentralization

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Evaluation of molecular and immunological methods for diagnosis of tuberculosis pleurisy

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Asian Pacific Journal of Tropical Medicine 2008年第4期1卷 14-19页

作者： Maysaa el sayed Zaki Clinical Pathology Faculty of MedicineMansoura UniversityEgypt

Objective:The inefficiency of conventional laboratory methods for diagnosis of Pleural tuberculosis(TBP) and the reliance on pleural biopsy have motivated the evaluation of alternative diagnostic *** goal was to evaluate different laboratory techniques Ziehl Neelsen,Mantoux skin test,determination of interferon gamma in serum and pleural fluid,polymerase chain reaction and serological study of specific IgG,IgM and IgA beside bacteriological culture by BACTEC 460 TB for rapid and accurate diagnosis of tuberculosis pleurisy. Methods:Patients presented with pleural effusions were subjected to study by ZN,PCR,serological study By specific IgG,IgM and IgA for A60 of tuberculosis compared to culture by BACTEC460 *** gamma was determined both in serum and pleural ***:Mantoux skin test was positive in 19 TBP patients and four patients with exudative pleural effusion.Z.N staining results of pleural biopsy specimens were positive in only 1 of 23 patients(4.3%) in the tuberculous pleural effusion *** was positive in 20 cases of group 1(87%).Serum and pleural fluid interferon had significantly elevated levels(Pelation in TBP(PelISA test was positive in 7/23(30.4%),IgM was positive in 17/23(73.9%) patients and IgG was positive in 16/23(69%) *** of the non TBP had either ZN,PCR or positive serum IgA,IgG,or *** the positive results for IgG and IgM were combined together the serological tests correcdy identified 20/23(87%) of patients. Conclusion:We suggest that in TBP serological diagnosis by combined use of IgG and IgM for A60 antigen with serum determination of interferon gamma can provide rapid and non invasive diagnostic tool that can justify the starting of chemotherapy while awaiting the results of culture.

关键词： Tuberculous pleurisy Molecular diagnosis Tuberculin Serology Interferon gamma

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Study of enteropathogens associated with paediatric gastroenteritis

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Asian Pacific Journal of Tropical Medicine 2009年第3期2卷 63-69页

作者： Maysaa el sayed Zaki Clinical Pathology Faculty of MedicineMansoura UniversityEgyt

Objective:To determine the etiology of acute diarrhea in children under 5 years of age and to improve- knowledge of the etiology of gastrointestinal pathogens using traditional and molecular diagnostic ***: Various common enteropathogens(viral,bacterial and parasites) associated with diarrhea were investigated by conventional and molecular techniques(PCR) for verotoxin present in Escherichia coli in 218 children less than 5 years of age admitted to Mansoura University Children hospital- ***:The occurrence of enteropathogens identified was as follows:*** O157:H7 38.8%followed by Salmonella Spp 29.4%,Aeromonas 20%and Shigella Spp 11.8%.Rotavirus was found in of samples 17.1%.Rotavirus was statistically significant in ageella isolates were tested for their susceptibility to common antimicrobial agents and most of the isolates were resistant to ampicillin and trimethoprim /***:This study demonstrated that rotavirus,*** O157:H7,Salmonella Spp,and Aeromonas were significant *** was significantly associated with infantile *** results highlight the value of using a combination of traditional and PCR techniques in the diagnosis of enteropathogens related to acute gastroenteritis in children.

关键词： Acute diarrhea Children Parasites Bacteria

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