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Effect of Microalloying Additions on the Microstructure and Mechanical Properties of Low Carbon Steel

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Journal of Iron and Steel Research International 2011年第S1期18卷 246-251页

作者： EISSA Mamdouh abd el-Aziz ahmed GHALI Saeed HALFA Hossam SABER Shady Central Metallurgical Research & Development Institute "CMRDI" Faculty of Material Science and Engineering German University in Cairo "GUC"

Low carbon steels are characterized by good weldability,formability and fracture toughness ***,the low strength levels of these steel grades limit their wide *** the other hand,increasing the strength by increasing the carbon content and alloying elements deteriorates the other *** this study,the microalloying technique was used to examine the possibility of attaining low carbon steels with good combination of strength,ductility and impact properties.A low carbon steel microalloyed with single addition of vanadium and another one microalloyed with combined addition of vanadium and titanium were used in this investigation and their properties were compared with non-microalloyed low carbon steel having the same base ***,other two nonmicroalloyed and V-microalloyed steels with higher carbon,silicon and manganese contents were also investigated to reveal the effect of base ***,hardness,room and zero temperature Charpy V-notch impact tests were conducted to evaluate the variations in the mechanical properties of low carbon hot forged steel containing vanadium and combinations of vanadium and *** addition,the microstructures of the different investigated steels were observed using both optical microscope and scanning electron ***,the hardness of the ferrite phase was also determined using micro-hardness *** results showed improvement of the mechanical properties of the investigated steels by both single V-and combined V + ***,hardness and impact tests results indicated that good combinations of strength,ductility and impact properties can be achieved by V-microalloying *** with combination of V and Ti microaddition has much higher hardness,yield strength,ultimate tensile strength and impact energy at both room and zero temperatures compared with non-microalloyed and single Vmicroalloyed *** C,Si and Mn contents result in

关键词： low carbon steels single microalloying combined microalloying strength ductility impact energy grain refinement precipitation strengthening

Early Detection of Alzheimer’s Disease Based on Laplacian Re-Decomposition and XGBoosting

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Computer Systems Science & Engineering 2023年第9期46卷 2773-2795页

作者： Hala ahmed hassan Soliman Shaker el-Sappagh Tamer Abuhmed Mohammed elmogy Information Technology Department Faculty of Computers and InformationMansoura UniversityMansoura35511Egypt Faculty of Computer Science and Engineering Galala UniversitySuez435611Egypt Faculty of Computers and Artificial Intelligence Benha UniversityBanha13518Egypt College of Computing and Informatics Sungkyunkwan UniversitySuwonKorea

The precise diagnosis of Alzheimer’s disease is critical for patient treatment,especially at the early stage,because awareness of the severity and progression risks lets patients take preventative actions before irreversible brain damage *** is possible to gain a holistic view of Alzheimer’s disease staging by combining multiple data modalities,known as image *** this paper,the study proposes the early detection of Alzheimer’s disease using different modalities of Alzheimer’s disease brain ***,the preprocessing was performed on the ***,the data augmentation techniques are used to handle ***,the skull is removed to lead to good *** the second phase,two fusion stages are used:pixel level(early fusion)and feature level(late fusion).We fused magnetic resonance imaging and positron emission tomography images using early fusion(Laplacian Re-Decomposition)and late fusion(Canonical Correlation Analysis).The proposed system used magnetic resonance imaging and positron emission tomography to take advantage of *** resonance imaging system’s primary benefits are providing images with excellent spatial resolution and structural information for specific *** emission tomography images can provide functional information and the metabolisms of particular *** characteristic helps clinicians detect diseases and tumor progression at an early ***,the feature extraction of fused images is extracted using a convolutional neural *** the case of late fusion,the features are extracted first and then ***,the proposed system performs XGB to classify Alzheimer’s *** system’s performance was evaluated using accuracy,specificity,and *** medical data were retrieved in the 2D format of 256×256 *** classifiers were optimized to achieve the final results:for the decision tree,the maximum depth of a tree was *** best number of trees for the random forest was 60;for

关键词： Alzheimer’s disease(AD) machine learning(ML) image fusion Laplacian Re-decomposition(LRD) XGBoosting

Collaborative Efforts and Strategies for Cholera Outbreak Control in Garissa County, Kenya: Implementation of Water Quality Monitoring Interventions

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Journal of Water Resource and Protection 2024年第2期16卷 123-139页

作者： Michael Habtu Mark Nanyingi Ali A. hassan abdiwahid M. Noor Joel Mutyandia Muli Alan Mwika Julius Wekesa ahmed Fidhow Diba Dulacha Landry Kabego Ishata Nannie Conteh Andre Arsene Bita Fouda Sonia Chene Aden H. Ibrahim ahmed Nadhir Omar Martins C. Livinus abdourahmane Diallo World Health Organization Nairobi Kenya Department of Health Garissa County Government Garissa Kenya Water Resources Authority Garissa Kenya World Health Organization Regional Office for Africa Brazzaville Congo Regional Agency for Health Dijon France

A multi-faceted Case Area Targeted Intervention (CATI) approach emphasizing the integration of Water, Sanitation and Hygiene (WASH) interventions and Oral Cholera Vaccine (OCV) campaign was employed to respond to the outbreak of cholera in Garissa County. Drinking water sources in areas heavily impacted by cholera were systematically mapped and tested for microbiological quality. The quality assessment was carried out in April 2023 during an ongoing cholera outbreak in the county. A total of 109 samples were collected and tested for thermotolerant coliforms and other in situ parameters. The finding revealed that more than 87% of the samples did not meet the World Health Organization (WHO) standard for thermotolerant coliforms;and 30% had turbidity values above the recommended threshold values. None of the 109 samples had any traceable residual chlorine. Following these findings, the county government implemented the targeted interventions which resulted in a positive impact in the fight against cholera. The WHO supported key interventions which included capacity building in water quality monitoring and prepositioning of critical WASH commodities to the cholera affected areas.

关键词： Cholera Drinking Water Household Water Treatment Kenya

Spectrofluorimetric and Spectrophotometric Stability- Iwndicating Methods for the Analysis of Veralipride in Presence of Its Degradants and in Spiked Human Plasma

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Chinese Journal of Chemistry 2012年第1期30卷 183-189页

作者： Salama,Nahla Nour el Din ahmed Salem,Maissa Yacoub abd el Halim,Lobna Mohammed abdel Fattah,Laila EI-Sayed National Organization for Drug Control and Research(NODCAR) 6 Abu Hazem StreetPyramids AveP.O.Box 29GizaEgypt Analytical Chemistry Department Faculty of PharmacyCairo UniversityCairoEgypt Analytical Chemistry Department Faculty of PharmacyMisr University for Science and Technology6th of OctoberEgypt

Spectrofluorimetric and spectrophotometric stability-indicating methods were developed and validated for analysis of veralipride （Ver） in presence of its hydrolytic and oxidative degradants. The spectrofluorimetric method was based on direct measurement of the intrinsic fluorescence of Ver at 366 nm after excitation at 299 nm using sodium lauryl sulfate （SLS） as micelle enhancer. The fluorescence intensity plot was linear over the concentration range 1.0-10.0 ***-1. The high sensitivity of the method allowed its successful application to the analysis of Ver in spiked human plasma. Two other methods were developed. They are based on the oxidative coupling reac- tion of Vet with 3-methyl benzothiazolin-2-one hydrazone （MBTH） hydrochloride in presence of ceric ammonium sulphate in an acidic medium. The first method depends on spectrophotometric measurement of the stable green colored oxidative coupling product at 660 nm. The different experimental parameters affecting the reaction were optimized. Linearity range is 10.0--100.0 ~tgomL-1. The second method depends on a fluorescence quenching effect of Vet on the fluorescence of Ce3＋. The difference in fluorescence intensity was measured at 380 nm after excitation at 300 nm. This method is applicable over the concentration ranges 0.25-2.50 pg-mL-1. The methods were validated according to the ICH guidelines. They were successfully applied for the analysis of Ver in drug substance, drug product and in laboratory prepared mixtures containing different percentages of hydrolytic and oxidative degradants.

关键词： veralipride micelle-enhanced fluorescence MBTH validation stability fluorescence quenching Ce3+

Cystic pancreatic lesions,the endless dilemma

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World Journal of Gastroenterology 2021年第21期27卷 2664-2680页

作者： Hussein hassan Okasha Abeer Awad ahmed el-meligui Reem Ezzat Ashraf Aboubakr Sameh Abouelenin Ramy el-Husseiny ahmed Alzamzamy Department of Internal Medicine and Gastroenterology Hepatology UnitKasr Al-Aini HospitalsCairo UniversityCairo 11562Egypt Department of Internal Medicine and Gastroenterology Hepatology UnitAssuit UniversityAssuit 71515Egypt Department of Gastroenterology and Hepatology Maadi Armed Forces Medical ComplexMilitary Medical AcademyCairo 11441Egypt Department of Gastroenterology and Hepatology Military Medical AcademyCairo 11441Egypt Department of Hepatology and Tropical Medicine National Hepatology and Tropical Medicine Research Institute(NHTMRI)Cairo 11441Egypt

Cystic pancreatic lesions involve a wide variety of pathological entities that include neoplastic and non-neoplastic *** proper diagnosis,differentiation,and staging of these cystic lesions are considered a crucial issue in planning further *** are great challenges for their diagnostic *** our time,new emerging methods for this diagnosis have been *** ultrasonography-guided fine-needle aspiration cytology with chemical and molecular analysis of cyst fluid and EUS-guided fine needlebased confocal laser endomicroscopy,through the needle microforceps biopsy,and single-operator cho-langioscopy/pancreatoscopy are promising methods that have been used in the diagnosis of cystic pancreatic *** we discuss the diagnosis of cystic pancreatic lesions and the benefits of various diagnostic models.

关键词： Pancreatic cystic lesion Endoscopic diagnosis Endoscopic ultrasonography Cyst fluid markers Endoscopic ultrasonography-guided fine needle-based confocal laser endomicroscopy Through the needle microforceps biopsy Single operator cholangioscopy/pancreatoscopy

Comprehensive evaluation and sensitivity analysis of regeneration energy for acid gas removal plant using single and activated-methyl diethanolamine solvents

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Chinese Journal of Chemical Engineering 2020年第6期28卷 1684-1693页

作者： Ammar Ali abd Samah Zaki Naji ahmed Barifcani Water Resources Engineering College Al-Qasim Green UniversityBabylonIraq Petroleum Engineering Department Kerbala UniversityKerbalaIraq Chemical Engineering Department Curtin University of TechnologyPerthAustralia.

The absorption of acid gas using reactive amines is among the most widely used types of capturing ***,the absorption process requires intensive energy expenditure majorly in the solvent regeneration *** study simultaneously evaluated the regeneration energy of MDEA and PZ/MDEA solvents in terms of heat of absorption,sensible heat,and vaporization *** Hysys version 8.8 simulation tool is applied to model the full acid gas removal plant for the chemical absorption *** new energy balance technique presents around the absorption and desorption columns to bring a new perspective of energy distribution in the capturing of acid gas *** analysis of regeneration energy and its three contributors is performed at several operation parameters such as absorber and stripper pressures,lean amine circulation rate,solvent concentration,reflux ratio,and CO2 and H2 S *** results show that the heat of absorption of PZ/MDEA system is higher than that for MDEA system for the same operating *** sensible heat is the main contributor in the required regeneration energy of MDEA solvent *** simulation results have been validated against data taken from real plant and *** product specifications of our simulation corroborate with real plant data in an excellent approach;additionally,the profile temperature of the absorber and the stripper columns are in good agreement with *** overall results highlight the direction of the effects of each parameter on the heat of absorption,sensible heat,and vaporization heat.

关键词： Heat of absorption Sensible heat Vaporization heat Regeneration energy Acid gases capturing Piperazine Activated-Methyl diethanolamine

Assessment and management of immature facial scars by non-surgical methods

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Chinese Journal of Plastic and Reconstructive Surgery 2022年第2期4卷 67-73页

作者： Riwina Adel el-Orabi Mohamed Radwan el-Hadidy ahmed hassan el-Sabbagh Plastic Surgery Center Faculty of MedicineMansoura UniversityMansoura 35516Egypt

Background:Scar quality is affected by patients’wound healing conditions,trauma type,and skin features that differ due to *** tremendous improvements in scar remodeling techniques,conspicuous scars can still remain ***-surgical methods used for handling scars include the use of topical corticosteroids,pressure therapy,lasers,and platelet-rich plasma(PRP).This study aimed to assess and evaluate different non-surgical modalities for treating immature facial ***:Fifteen patients with scars were included for non-surgical *** received one or more of 5 treatments:corticosteroid injection,topical silicone gel application with or without bandage,pressure therapy,lasers,or PRP *** were assessed using the Patient and Observer Scar Assessment Scale(POSAS)and serial ***:There were no significant differences in the results obtained using *** of the patients required a secondary intervention or sought a second *** rate of complications associated with the treatments were very ***:Good assessment of patient characteristics,proper planning,and appropriate treatment lead to favorable outcomes.

关键词： Facial scar Immature scar Non-surgical methods

Hepatitis C Virus RNA Strands Detection in Peripheral Blood Mononuclear Cells Legitimizes Virus Eradication in Negative Serum PCR Naive and Post-treatment Patients

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Journal of Clinical and Translational Hepatology 2017年第1期5卷 1-8页

作者： Mohamed Darwish ahmed abd Alla Mostafa Kamel el Awady Tropical Medicine Department Faculty of MedicineAl-Azhar UniversityCairoEgypt Department of Microbial Biotechnology National Research CenterCairoEgypt

Background and Aims:Hepatitis C virus(HCV)hepatotropism is associated with intra-peripheral blood mononuclear cell(PBMC)infection that causes post-treatment relapse in RNA seronegative *** understanding of the association of non-viremic hepatic fibrosis with positive anti-HCV IgG antibodies and active hepatocellular damage might be increased by PBMCs screening for intracellular ***,the goals of this study included evaluation of PBMCs PCR for diagnosing HCV infection,addressing PBMCs plus serum real-time(SRT)PCR benefits over SRT-PCR alone,studying intraPBMCs distribution of RNA sense and antisense strands,and identifying treatment feasibility in solitary intracellular ***:Enzyme-linked immunosorbent assay,SRT-PCR and PBMCs PCR were used to evaluate HCV infection in 401 *** patients were classified into groups of negative controls(n=30),positive controls(n=63),non-viremia post-treatment(experienced;n=166)and na(i)ve(n=49)cases,and non-viremia positive PBMCs PCR na(i)ve(n=35)and experienced(n=58)***:The diagnosis of true positive and negative by PBMCs PCR and SRT-PCR had 100%and 96.7%compatibility *** PCR detected intracellular HCV infection in 49 out of 215 non-viremia patients;among them,na(i)ve cirrhotics had significantly higher number of intracellular infection than the na(i)ve non-cirrhotic(Pely recognized in na(i)ve and experienced cases(P=0.01218).Intracellular HCV strands were detected in 18.02%of experienced *** of intracellular RNA strands showed significant decline in experienced compared to na(i)ve patients(Pellular HCV when SRT-PCR is *** and sense strands are respectively recognized more often in na(i)ve and experienced *** expected overall relapsing rate in our cohort was 18.02%.Int

关键词： HCV PBMCs RNA Strands

Magnetic Field Effect and Heat Transfer of Nanofluids within Waveform Microchannel

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Computer Modeling in Engineering & Sciences 2023年第3期134卷 1957-1973页

作者： Mehdi Moslemi Motahare Mahmoodnezhad S.A.Edalatpanah Sulima ahmed Mohammed Zubair Hamiden abd el-Wahed Khalifa Ayandegan Institute of Higher Education TonekabonIran Department of Mathematics College of Science and ArtsQassim UniversityAr RassSaudi Arabia Operations Research Department Faculty of Graduate Studies for Statistical ResearchCairo UniversityGizaEgypt

In this research,a numerical study of mixed convection of non-Newtonian fluid and magnetic field effect along a vertical wavy surface was investigated.A simple coordinate transformation to transform wavy surface to a flat surface is employed.A cubic spline collocation numerical method is employed to analyze transformed *** effect of various parameters such as Reynolds number,volume fraction 0-,Hartmann number,and amplitude of wave length was evaluated in improving the performance of a wavy *** to the presented results,the sinusoidal shape of the microchannel has a direct impact on heat *** increasing the microchannel wave amplitude,the Nusselt number has *** the other hand,increasing the heat transfer in the higher wavelength ratio corrugated channel is seen as an effective method of increasing the heat transfer,especially at higher Reynolds *** results showed that with increasing Hartmann numbers,the flow line near thewall becomesmore regular and,according to the temperature gradient created,theNusselt number growth.

关键词： Heat transfer magnetic field nano fluid vorticity wavy micro channel