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Enhancement of Electric Conductivity in Transparent glasse—Ceramic Nanocomposites of Bi_2O_3—BaTiO_3 glasses

Journal of materials Science & Technology 2013年第12期29卷 1166-1176页

作者： A.A.Bahgat m.g.moustafa E.E.Shaisha Department of Physics Faculty of ScienceAl-Azhar University

The frequency and temperature dependent electrical conductivity measurements for heat-treated binary glass system with composition of （lO0-x）Bi203-xBaTi03 （x = 20, 30, 40 and 50, in mol%） were carried out. The glass was prepared by melt quenching technique and their corresponding glass-ceramic nanocomposites were obtained by suitable heat treatment. Nanostructured behavior and electrical properties of these glasses and their corresponding glass-ceramic nanocomposites were studied. X-ray diffraction （XRD） and differential scanning calorimetry confirmed the amorphous nature of the glasses. moreover, XRD patterns of the samples indicate nanocrystallites embedded in the glass matrix. The Fourier transform infrared spectroscopy （FT-IR） spectral analysis showed that the band positions of glass system are within the wave number range of Bi06, Bi03 and Ti06 structural units. It is observed that the electrical conductivity is enhanced by 102-103 times in the transparent glass-ceramic nanocomposite phase. With further heat treatment, the conductivity decreased considerably in the stage of glass-ceramic nanocomposite phase as compared with the glassy phase sample. Therefore, partially devitrified phase is more suitable as cathode material in secondary batteries compared to its vitreous or fully crystalline counterpart. The conduction mechanism was confirmed to obey the adiabatic small polaron hopping （SPH）. AC conductivity measurements were performed as a function of temperature and frequency, showing a very slow increasing rate at low temperatures and then a fast rate at higher temperatures.

关键词： Barium titanat Transparent glass--ceramic nanocomposites DC electrical conductivity AC electrical conductivity Smallpolaron hopping

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Treating wastewater under zero waste principle using wetland mesocosms

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Frontiers of Environmental Science & Engineering 2021年第4期15卷 155-168页

作者： Safaa m.Ezzat mohammed T.moustafa microbiology Deptartment Central Laboratory for Environmental Quality Monitoring(CLEQM)National Water Research Center(NWRC)CairoEgypt

The present investigation demonstrates the synergistic action of using a sedimentation unit together with Cyperus papyrus(L.)wetland enriched with zeolite mineral in one-year round experiment for treating *** system was designed to support a horizontal surface flow pattern and showed satisfactory removal efficiencies for both physicochemical and bacteriological contaminants within 3 days of residence *** removal efficiencies ranged between 76.3%and 98.8%for total suspended solids,turbidity,iron,biological oxygen demand,and *** bacterial indicators(total and fecal coliforms,as well as fecal streptococci)and the potential pathogens(Escherichia coli,Staphylococcus aureus,and Pseudomonas aeruginosa)showed removal efficiencies ranged between 96.9%and 99.8%.We expect the system to offer a smart management for every component according to zero waste *** treated effluent was reused to irrigate the landscape of pilot area,and the excess sludge was recycled as fertilizer and soil *** zeolite mineral did not require regeneration for almost 36 weeks of operation,and enhanced the density of shoots(14.11%)and the height of shoots(15.88%).The harvested plant biomass could be a profitable resource for potent antibacterial and antioxidant bioactive *** could certainly offset part of the operation and maintenance costs and optimize the system implementation *** the experiment was designed under local conditions,its results could provide insights to upgrade and optimize the performance of other analogous large-scale constructed wetlands.

关键词： Wastewater Dynamic roughing filter Cyperus papyrus(L.) Zeolite Zero waste

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geotectonic significance of the Neoproterozoic ophiolitic metagabbros of muiswirab area,South Eastern Desert,Egypt:constraints from their mineralogical and geochemical characteristics

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Acta geochimica 2020年第6期39卷 887-910页

作者： moustafa m.mogahed Wlaa mahmoud Saad geology Department Faculty of ScienceBenha University-EgyptP.O.Box 13518BenhaEgypt

Petrological and geochemical studies of Neo-proterozoic metagabbros were carried out in the muiswirab area,South Eastern Desert of *** muiswirab area comprises of ophiolitic metagabbroic rocks(mOm),which are tectonically thrusted over a thick pile of metavolcanic rocks and intruded by syn-and post-tectonic granitoid *** whole-rock geochemical variations coupled with chemical compositions of mineral constituents are used to attain the genesis and tectonic evolution of the studied *** geothermobarometric investiga-tion of the analyzed amphiboles from(mOm)revealed that these metagabbros underwent regional metamorphism under lower to upper greenschist facies(biotite zone)conditions(at a temperature of 450 to 500℃and pressure of 1-3 kbar).geochemically,the metagabbros(mOm)show tholeiitic affinity and cxhibiting both arc-and mORB-like characters as evidenced by their clinopyrox-ene compositions and the Ti/V ratios(11.84-31.65),which considered as prominent features of forearc tectonic *** geochemical features suggest a probable fractionation of olivine±clinopyroxene±plagioclase as well as insignificant crustal *** parental magma of the investigated mOm rocks seems to be developed in a sub-arc mantle wedge setting due to the enrichments of LILE(e.g..Rb,Ba,Sr,Pb)over HFSE(e.g,Ti,Nb,Y,Zr,Hf,Ta).The studied mOm rocks have lower values of Nb/U relative to mORB and OIB indicating that their geochemical variation produced due to the enrichment of a lithosphere mantle by OIB like *** ratios of Zn/Fet,La/Sm,Sm/Yb,Th/Yb and Nb/Yb indicate that the mOm rocks represent a fragment of oceanic crust originated at a supra-subduction zone environment and their parental magma developed by 5-30%partial melting of a spinel lherzolite mantle rather than pyroxenite in an island arc setting and conformable with most of the Egyptian ophiolitic metagabbros.

关键词： Egypt Eastern Desert muiswirab area Ophiolitic metagabbros N-mORB Arc tholeiites Foreare tectonic regime Volcanic-arc setting

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Constraints of mantle and Crustal Sources Interaction during Orogenesis of Pre-and Post-collision granitoids from the Northern Arabian-Nubian Shield:A Case Study from Wadi El-Akhder granitoids,Southern Sinai,Egypt

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Acta geologica Sinica(English Edition) 2021年第5期95卷 1527-1550页

作者： moustafa m.mOgAHED Khaled m.ABDELFADIL geology Department Faculty of ScienceBenha UniversityBenha 13518Egypt geology Department Faculty of ScienceSohag UniversitySohag 82524Egypt

The Egyptian older and younger granitic rocks emplaced during pre-and post-collision stages of Neoproterozoic Pan-African orogeny,respectively,are widely distributed in the southern Sinai Peninsula,constituting 70% of the basement *** Wadi El-Akhder,southwestern Sinai,is a mountainous terrain exposing two granitoid suites,namely the Wadi El-Akhder Older granites(AOg)and the Homra Younger granites(HYg).The AOg(granodiorites with subordinate tonalite compositions)have geochemical characteristics of medium-K calc-alkaline,metaluminous to mildly peraluminous granitoids formed in an island-arc environment,which are conformable with well-known Egyptian older granitoids rocks,whereas the HYg display calc-alkaline to slightly alkaline nature,peraluminous syeno-,monzogranites and alkali feldspar granites matching well those of the Egyptian younger *** respect to the AOg granitoids,the HYg granites contain lower Al_(2)O_(3),FeO^(*),mgO,mnO,CaO,TiO_(2),Sr,Ba,and V,but higher Na_(2)O,K_(2)O,Nb,Zr,Th,and *** AOg are generally characterized by enrichment in LILE and LREE and depletion in HFSE relative to N-mORB values(e.g.,negative Nb and Ta anomalies).The geochemical features of the AOg follow assimilation-fractional crystallization(AFC)trends indicative of extensive crustal contamination of magma derived from a mantle *** chemical characteristics of the AOg are remarkably similar to those of subduction-related granitoids from the ArabianNubian Shield(ANS).The compositional variations from monzogranites through syenogranites to alkali feldspar granite within HYg could not be explained by fractional crystallization *** the whole-rock composition of the HYg to melts generated by experimental dehydration melting of meta-sedimentary and magmatic rocks reveals that they appear to be derived by extended melting of psammitic and pelitic metasediments,which is similar to the most of younger granitic suites in the ANS.

关键词： older and younger granitoids mantle-crust interaction assimilation-fractional crystallization(AFC) southern Sinai Arabian-Nubian Shield

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Framework for COVID-19 Segmentation and Classification Based on Deep Learning of Computed Tomography Lung Images

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Journal of Electronic Science and Technology 2022年第3期20卷 246-256页

作者： Wessam m.Salama moustafa H.Aly the Department of Basic Science Faculty of EngineeringPharos UniversityAlexandria12455Egypt the Department of Electronics and Communications Engineering College of Engineering and TechnologyArab Academy for ScienceTechnology and Maritime TransportAlexandria1029Egypt

Corona Virus Disease 2019(COVID-19) has affected millions of people worldwide and caused more than6.3 million deaths(World Health Organization, June 2022). Increased attempts have been made to develop deep learning methods to diagnose COVID-19 based on computed tomography(CT) lung images. It is a challenge to reproduce and obtain the CT lung data, because it is not publicly available. This paper introduces a new generalized framework to segment and classify CT images and determine whether a patient is tested positive or negative for COVID-19 based on lung CT images. In this work, many different strategies are explored for the classification ***50 and Vgg16 models are applied to classify CT lung images into COVID-19 positive or negative. Also,Vgg16 and ReNet50 combined with U-Net, which is one of the most used architectures in deep learning for image segmentation, are employed to segment CT lung images before the classifying process to increase system performance. moreover, the image size dependent normalization technique(ISDNT) and Wiener filter are utilized as the preprocessing techniques to enhance images and noise suppression. Additionally, transfer learning and data augmentation techniques are performed to solve the problem of COVID-19 CT lung images deficiency, therefore the over-fitting of deep models can be avoided. The proposed frameworks, which comprised of end-to-end, Vgg16,ResNet50, and U-Net with Vgg16 or ResNet50, are applied on the dataset that is sourced from COVID-19 lung CT images in Kaggle. The classification results show that using the preprocessed CT lung images as the input for U-Net hybrid with ResNet50 achieves the best performance. The proposed classification model achieves the 98.98%accuracy(ACC), 98.87% area under the ROC curve(AUC), 98.89% sensitivity(Se), 97.99 % precision(Pr), 97.88%F-score, and 1.8974-seconds computational time.

关键词： Augmentation classification computed tomography(CT) Corona Virus Disease 2019(COVID-19) deep learning ResNet50 segmentation U-Net Vgg16

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Deterministic and Stochastic Fractional Order model for Lesser Date moth

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Computer Systems Science & Engineering 2022年第2期40卷 749-764页

作者： moustafa El-shahed Asmaa m.Al-Dububan Department of mathematics Unaizah College of Sciences and ArtsQassim UniversityP.O.Box 3771Unaizah51911Saudi Arabia Department of mathematics Buraydah College of Sciences and ArtsQassim UniversityP.O.Box 1162Buraydah51431Saudi Arabia

In this paper,a deterministic and stochastic fractional order model for lesser date moth(LDm)using mating disruption and natural enemies is proposed and *** interaction between LDm larvae,fertilized LDm female,unfertilized LDm female,LDm male and the natural enemy is *** order to clarify the characteristics of the proposed deterministic fractional order model,the analysis of existence,uniqueness,non-negativity and boundedness of the solutions of the proposed fractional-order model are *** addition,some sufficient conditions are obtained to ensure the local and global stability of equilibrium *** occurrence of local bifurcation near the equilibrium points is investigated with the help of Sotomayor’s *** simulations are conducted to illustrate the properties of the proposed fractional order model with respect to the intrinsic growth rate of the LDm larvae,natural enemy’s mortality rate,predation rate,sex pheromone trap parameter,fractional order and environmental *** impact of mating disruption on lesser date moth is ***,a numerical approximation method is developed for the proposed stochastic fractional-order model.

关键词： Lesser date moth stochastic stability natural enemies Sotomayor’s theorem mating disruption

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Comparison of the effect of carbon,halloysite and titania nanotubes on the mechanical and thermal properties of LDPE based nanocomposite films

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Chinese Journal of Chemical Engineering 2018年第2期26卷 428-435页

作者： Khaliq majeed mariam Al Ali Almaadeed moustafa m.Zagho Center for Advanced materials Qatar UniversityPO Box 2713DohaQatar Department of Chemical Engineering COMSATS Institute olin formation TechnologyLahorePakistan materials Science and Technology Program Qatar UniversityPO Box 2713DohaQatar

In this study, titania nanotubes （TNTs） were prepared by hydrothermal method with the aim to compare the properties of these one-dimensional tubular nanostructures＇ reinforced nanocomposites with the carbon and halloysite nanotubes＇（CNTs and HNTs, respectively） reinforced nanocomposites. Low density polyethylene （LDPE） was used as the matrix material. The prepared nanocomposites were characterized and compared by means of their morphological, mechanical and thermal properties. SEm results showed enhanced interracial interaction and better dispersion of TNTs and HNTs into LDPE with the incorporation of a mAPE compatibilizer, however, these interactions seem to be absent between CNTs and LDPE, and the CNTs remained agglomerated. Contact angle measurements revealed that CNT filled nanocomposites are more hydrophilic than HNT composites, and less than TNT composites. CNTs provided better tensile strength and Young＇s modulus than HNT and TNT nanocomposites, a 42% increase in tensile strength and Young＇s modulus is achieved compared to LDPE. Tear strength improvement was noticed in the TNT composites with a value of 35.4 N. mm -1, compared to CNT composites with a value of 25.5 *** 1 -s- 1. All the prepared nanocomposites are more thermally stable than neat LDPE and the best improvement in thermal stability was observed for CNT reinforced nanocomposites. CNTs depicted the best improvement in tensile and thermal properties and the mAPE compatibilizer effective- ness regarding morphological, mechanical and thermal properties was only observed for TNT and HNT systems.

关键词： Hydrothermal Nanostructure Nanotube Nanocomposite mechanical properties Thermal properties

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Deterministic and Stochastic Fractional-Order Hastings-Powell Food Chain model

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Computers, materials & Continua 2022年第2期70卷 2277-2296页

作者： moustafa El-Shahed Asmaa m.Al-Dububan Department of mathematics Unaizah College of Sciences and ArtsQassim UniversityUnaizah51911Saudi Arabia Department of mathematics Buraydah College of Sciences and ArtsQassim UniversityBuraydah51431Saudi Arabia

In this paper,a deterministic and stochastic fractional-order model of the tri-trophic food chain model incorporating harvesting is proposed and *** interaction between prey,middle predator and top predator population is *** order to clarify the characteristics of the proposed model,the analysis of existence,uniqueness,non-negativity and boundedness of the solutions of the proposed model are *** sufficient conditions that ensure the local and global stability of equilibrium points are *** using stability analysis of the fractional-order system,it is proved that if the basic reproduction number R_(0)m point E_(1) is globally asymptotically *** occurrence of local bifurcation near the equilibrium points is investigated with the help of Sotomayor’s *** numerical examples are given to illustrate the theoretical *** impact of harvesting on prey and themiddle predator is *** conclude that harvesting parameters can control the dynamics of the middle predator.A numerical approximation method is developed for the proposed stochastic fractional-order model.

关键词： Food chain model global dynamics stability stochastic Hastings-Powell model harvesting

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Wrap choice during fundoplication

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World Journal of gastroenterology 2019年第48期25卷 6876-6879页

作者： Simon R Bramhall moustafa m mourad Department of Surgery The County HospitalHereford HR12ERUnited Kingdom Department of Surgery Worcester Royal InfirmaryWorcester WR51DDUnited Kingdom

gastro-oesphageal reflux disease is an increasing health *** mainstay of treatment has conventionally been medical therapy but since the introduction of laparoscopic surgery laparoscopic anti-reflux surgery has been increasingly used for intractable symptoms or in patients unwilling to take long term *** Nissen 360 degree wrap has traditionally been considered the gold standard operation but can be associated with significant *** complications include“gas bloat”and dysphagia and can occur relatively *** modifications have been described to the original operation and some of these have been *** addition alternative wraps have been described which seem to have a reduced incidence of complications associated with their *** editorial discusses the various types of wrap that can be performed and the minimum requirements of the surgical *** evidence from a recent meta-analysis of the randomised data has suggested that an anterior wrap is associated with a lower rate of complications and gives just as good control of reflux *** advantages and disadvantages of an anterior wrap are *** lack of long term follow up data concerns some practitioners and at the moment the choice of wrap carried out still rests with the individual surgeon.

关键词： Fundoplication Wrap Laparoscopic Reflux disease Choice

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multitarget therapeutic strategies for Alzheimer's disease

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Neural Regeneration Research 2019年第3期14卷 437-440页

作者： mostafa m.Ibrahim moustafa T.gabr Department of Pharmacognosy Faculty of Pharmacy Mansoura University Department of Basic Pharmaceutical and Toxicological Sciences College of Pharmacy University of Louisiana at Monroe Department of medicinal Chemistry Faculty of Pharmacy Mansoura University Department of Chemistry University of Iowa

Neurodegenerative diseases such as Alzheimer's, Huntington's and Parkinson's diseases have multifaceted nature because of the different factors contributing to their progression. The complex nature of neurodegenerative diseases has developed a pressing need to design multitarget-directed ligands to address the complementary pathways involved in these diseases. The major enzyme targets for development of therapeutics for Alzheimer's disease are cholinesterase and β-secretase enzymes. In this review, we discuss recent advances in profiling single target inhibitors based on these enzymes to multitarget-directed ligands as potential therapeutics for this devastating disease. In addition, therapeutics based on iron chelation strategy are discussed as well.

关键词： multitarget-directed ligands acetylcholinesterase β-secretase Alzheimer's disease hybridization neurodegenerative diseases tacrine brain permeability

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