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International Journal of Organic Chemistry 2012年第2期2卷 135-142页

作者： Seif-eldin Nasr Ayyad Fathy Muhammad Abdelaziz el-Taweel Abdel-Ghani Ali elagamey tahani mahmoud el-mashad Department of Chemistry Faculty of Science King Abdulaziz University Jeddah Saudi Arabia Department of Chemistry Faculty of Science New Damietta Branch Mansoura University New Damietta Egypt

2-Thioxothiazole derivatives 5a-c were prepared by reacting a mixture of 1a-c, CS2/KOH and 4-(2-chloroacetyl)-1, 5-dimethyl-2-phenyl-1H-pyrazol-3(2H)-one(3). Reacting 2-cyano-N-(4-(1,5-dimethyl-3-oxo-2-phenyl-2,3-dihydro-2H- pyrazol-4-yl)-2-thioxothiazol-3(2H)-yl)acetamide (5c) with mercaptoacetic acid, arylidenemalononitriles 8 and (E)- 3-(dimethylamino)-1-(furan-2-yl)prop-2-en-1-one (12) give 4-oxo-4,5-dihydrothiazole 6, 2-oxo-1,2-dihydropyridine 10 and 2-oxo-2H-pyran 15 respectively. Heating a mixture of 5c, malononitrile and elemental sulfur yield 2,4-diaminothio- phene 19. Coupling of 5c with the diazotized aminopyrazole 20 and aryldiazonium salts 23 give pyrazolo[5,1-c][1,2,4] triazines 22 and arylhydrazones 25 respectively.

关键词： Thioxothiazoles Pyridine Thiophene Pyrazolotriazines

Dysprosium oxide,alumina,and graphene oxide reinforced polycaprolactone thin films:Thermal stability,morphology,and cell viability

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Journal of Rare Earths 2024年第7期42卷 1337-1343,I0005页

作者： Mohamed Tharwat elabbasy Mohamed R.Atteya Mai A.Samak Mousa Abdelrahman tahani Almahmoud M.A.el-Morsy A.A.Menazea M.F.H.Abd el-Kader Department of Public Health College of Public Health and Health InformaticsUniversity of Ha'ilHa'il2440Saudi Arabia Food Control Department Faculty of Veterinary MedicineZagazig UniversityZagazig44519Egypt Department of Physical Therapy College of Applied Medical SciencesUniversity of Ha'ilHa'ilSaudi Arabia Department of Histology and Cell Biology Faculty of MedicineZagazig UniversityZagazig44519Egypt College of Nursing University of Ha'ilHa'ilSaudi Arabia College of Science and Humanities in Al-Kharj Physics DepartmentPlasma Technology and Material Science UnitPrince Sattam Bin Abdulaziz UniversityAl-kharj11942Saudi Arabia Physics Department Faculty of ScienceUniversity of DamiettaNew Damietta34517Egypt Spectroscopy Department Physics Research InstituteNational Research CentreDokki12622GizaEgypt Biophysics Department Faculty of ScienceCairo UniversityGizaEgypt

Developing a biomaterial for wound healing applications is still a ***,dysprosium oxide(Dy_(2)O_(3)),aluminum oxide(Al_(2)O_(3)),and graphene oxide(GO)were embedded in cast films based on polycaprolactone(PCL)to be examined for wound dressing *** techniques were used to characterize the fabricated films including X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FTIR),Raman,and scanning electron microscopy(SEM),besides their biological *** thermogravimetric analysis(TGA)exhibits high thermal stability as the scaffold weight decreases slightly to 98.6%after raising the temperature from room temperature to 280℃.The cell viability was investigated and it is shown that the viable cells grow up to approximately 93%at 75μg/***,the cell attachment shows excellent behavior as the cells attach on most of the surface of the modified PCL which shows high biocompatibility.

关键词： Wound healing Polycaprolactone Dy_(2)O_(3) Al_(2)O_(3) Biocompatible Rare earths

Local Features-Based Watermarking for Image Security in Social Media

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Computers, Materials & Continua 2021年第12期69卷 3857-3870页

作者： Shady Y.el-mashad Amani M.Yassen Abdulwahab K.Alsammak Basem M.elhalawany Department of Computer Systems Engineering Faculty of Engineering at ShoubraBenha UniversityEgypt Department of Communications and electronics Engineering Faculty of Engineering at ShoubraBenha UniversityEgypt

The last decade shows an explosion of using social media,which raises several challenges related to the security of personal files including *** challenges include modifying,illegal copying,identity fraud,copyright protection and ownership of *** digital watermarking techniques embed digital information inside another digital information without affecting the visual quality for security *** this paper,we propose a hybrid digital watermarking and image processing approach to improve the image security ***,variants of the widely used Least-Significant Bit(LSB)watermarking technique are merged with a blob detection algorithm to embed information into the boundary pixels of the largest blob of a digital *** proposed algorithms are tested using several experiments and techniques,which are followed by uploading the watermarked images into a social media site to evaluate the probability of extracting the embedding *** results show that the proposed approaches outperform the traditional LSB algorithm in terms of time,evaluation criteria and the percentage of pixels that have changed.

关键词： Digital watermarking LSB social media blob detection image security

Growth Kinetics and Chitosan Flocculation of Spirufina platensis Algae

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Journal of Environmental Science and Engineering(A) 2014年第3期3卷 150-162页

作者： Hamed el-mashad Department of Agriculture and Environmental Sciences Lincoln University Jefferson City 65101 Missouri USA Department of Agricultural Engineering Faculty of Agriculture Mansoura University Mansoura P.O. Box 46 Egypt

S. platensis （Spirulinaplatensis） algae were grown in batch reactors at 30 ± 1℃ with a continuous illumination of 50 ±2 μmol·m^-2·s^-1 using different growth media and air flow rates. A modified Gompertz kinetic model was applied to estimate the maximum concentration of algae and the growth rate at different conditions. A peak cell productivity of 21.91 mg·L^-1·day^-1 （dry biomass） was determined using commercial nutrient media （F/2, part A and part B） and modified Zarrouk medium at an air flow rate of 3 L·L^-1·min^-1. Using the commercial media at high concentrations yielded high biomass concentrations. The results of the modified Gompertz kinetic model indicated that the highest growth rate was 0.118 g·L^-1·day^-1. This growth rate was determined for S. platensis cultivated using 0.399 mL·L^-1 of the commercial media. Response surface methodology was applied to optimize the parameters （temperature, pH, and chitosan dose） that affect the efficiency of the flocculation of S. platensis. An optimum flocculation of 98.7% was determined at a pH, temperature, and chitosan dose of 5.5, 30℃, and 75 mL·L^-1, respectively.

关键词： S. platensis algae growth kinetics flocculation chitosan RSM (response surface methodology).

Hybrid Sine Cosine and Stochastic Fractal Search for Hemoglobin Estimation

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Computers, Materials & Continua 2022年第8期72卷 2467-2482页

作者： Marwa M.Eid Fawaz Alassery Abdelhameed Ibrahim Bandar Abdullah Aloyaydi Hesham Arafat Ali Shady Y.el-mashad Faculty of Artificial Intelligence Delta University for Science and TechnologyMansoura35712Egypt Department of Computer Engineering College of Computers and Information TechnologyTaif UniversityTaif21944Saudi Arabia Computer Engineering and Control Systems Department Faculty of EngineeringMansoura UniversityMansoura35516Egypt Mechanical Engineering Department Qassim UniversityBuraidah51452Saudi Arabia Department of Computer Systems Engineering Faculty of Engineering at ShoubraBenha UniversityEgypt

The sample’s hemoglobin and glucose levels can be determined by obtaining a blood sample from the human body using a needle and analyzing ***(HGB)is a critical component of the human body because it transports oxygen from the lungs to the body’s tissues and returns carbon dioxide from the tissues to the *** the HGB level is a critical step in any blood analysis *** often indicate whether a person is anemic or polycythemia *** ensemble models by combining two or more base machine learning(ML)models can help create a more improved *** purpose of this work is to present a weighted average ensemble model for predicting hemoglobin *** optimization method is utilized to get the ensemble’s optimum *** optimum weight for this work is determined using a sine cosine algorithm based on stochastic fractal search(SCSFS).The proposed SCSFS ensemble is compared toDecision Tree,Multilayer perceptron(MLP),Support Vector Regression(SVR)and Random Forest Regressors as model-based approaches and the average ensemble *** SCSFS results indicate that the proposed model outperforms existing models and provides an almost accurate hemoglobin estimate.

关键词： Sine cosine optimization metaheuristics optimization hemoglobin estimation weight average ensemble

Improved Prediction of Metamaterial Antenna Bandwidth Using Adaptive Optimization of LSTM

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Computers, Materials & Continua 2022年第10期73卷 865-881页

作者： Doaa Sami Khafaga Amel Ali Alhussan el-Sayed M.el-kenawy Abdelhameed Ibrahim Said H.Abd elkhalik Shady Y.el-mashad Abdelaziz A.Abdelhamid Department of Computer Sciences College of Computer and Information SciencesPrincess Nourah Bint Abdulrahman UniversityRiyadh11671Saudi Arabia Department of Communications and electronics Delta Higher Institute of Engineering and TechnologyMansoura35111Egypt Faculty of Artificial Intelligence Delta University for Science and TechnologyMansoura35712Egypt Computer Engineering and Control Systems Department Faculty of EngineeringMansoura UniversityMansoura35516Egypt Department of Computer Systems Engineering Faculty of Engineering at ShoubraBenha UniversityEgypt Department of Computer Science Faculty of Computer and Information SciencesAin Shams UniversityCairo11566Egypt Department of Computer Science College of Computing and Information TechnologyShaqra University11961Saudi Arabia

The design of an antenna requires a careful selection of its parameters to retain the desired ***,this task is time-consuming when the traditional approaches are employed,which represents a significant *** the other hand,machine learning presents an effective solution to this challenge through a set of regression models that can robustly assist antenna designers to find out the best set of design parameters to achieve the intended *** this paper,we propose a novel approach for accurately predicting the bandwidth of metamaterial *** proposed approach is based on employing the recently emerged guided whale optimization algorithm using adaptive particle swarm optimization to optimize the parameters of the long-short-term memory(LSTM)deep *** optimized network is used to retrieve the metamaterial bandwidth given a set of *** addition,the superiority of the proposed approach is examined in terms of a comparison with the traditional multilayer perceptron(ML),Knearest neighbors(K-NN),and the basic LSTM in terms of several evaluation criteria such as root mean square error(RMSE),mean absolute error(MAE),and mean bias error(MBE).Experimental results show that the proposed approach could achieve RMSE of(0.003018),MAE of(0.001871),and MBE of(0.000205).These values are better than those of the other competing models.

关键词： Metamaterial antenna long short term memory(LSTM) guided whale optimization algorithm(Guided WOA) adaptive dynamic particle swarm algorithm(AD-PSO)

Power Inverted Topp–Leone Distribution in Acceptance Sampling Plans

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Computers, Materials & Continua 2021年第4期67卷 991-1011页

作者： tahani A.Abushal Amal S.Hassan Ahmed R.el-Saeed Said G.Nassr Faculty of Science Umm AL-Qura UniversityMakkah Al Mukarramah715Saudi Arabia Faculty of Graduate Studies for Statistical Research Cairo UniversityGiza12613Egypt Obour High Institute for Management&Information Al-Sharqua44516Egypt Faculty of Business Administration Sinai UniversityAl-Arish45511Egypt

We introduce a new two-parameter model related to the inverted Topp–Leone distribution called the power inverted Topp–Leone(PITL)*** properties of the PITL distribution are stated;including;quantile measures,moments,moment generating function,probability weighted moments,Bonferroni and Lorenz curve,stochastic ordering,incomplete moments,residual life function,and entropy *** sampling plans are developed for the PITL distribution,when the life test is truncated at a pre-specified *** truncation time is assumed to be the median lifetime of the PITL distribution with pre-specified *** minimum sample size necessary to ensure the specified life test is obtained under a given consumer’s *** results for given consumer’s risk,parameters of the PITL distribution and the truncation time are *** estimation of the model parameters is argued using maximum likelihood,least squares,weighted least squares,maximum product of spacing and Bayesian methods.A simulation study is confirmed to evaluate and compare the behavior of different *** real data applications are afforded in order to examine the flexibility of the proposed model compared with some others *** results show that the power inverted Topp–Leone distribution is the best according to the model selection criteria than other competitive models.

关键词： Inverted Topp-Leone distribution acceptance sampling plans maximum likelihood estimators weighted least squares estimators Bayesian estimators

Interspecific density-dependent model of predator-prey relationship in the chemostat

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International Journal of Biomathematics 2021年第1期14卷 51-72页

作者： tahani Mtar Radhouane Fekih-Salem Tewfik Sari University of Tunis el Manar National Engineering School of TunisLAMSIN 1002TunisTunisia University of Monastir Higher Institute of Computer Science of Mahdia5111 MahdiaTunisia ITAP Univ MontpellierINRAEInstitut AgroMontpellierFrance

The objective of this study is to analyze a model of competition for one resource in the chemostat with general interspecific density-dependent growth rates,taking into account the predator–prey *** relationship is characterized by the fact that the prey species promotes the growth of the predator species which in turn inhibits the growth of the first *** model is a three-dimensional system of ordinary differential *** the same dilution rates,the model can be reduced to a planar system where the two models have the same local and even global *** existence and stability conditions of all steady states of the reduced model in the plane are determined according to the operating *** the nullcline method,we present a geometric characterization of the existence and stability of all equilibria showing the multiplicity of coexistence steady *** bifurcation diagrams illustrate that the steady states can appear or disappear only through saddle-node or transcritical ***,the operating diagrams describe the asymptotic behavior of this system by varying the control parameters and show the effect of the inhibition of predation on the emergence of the bistability region and the reduction until the disappearance of the coexistence region by increasing this inhibition parameter.

关键词： Bifurcation chemostat coexistence predator-prey relationship operating diagram

Recent developments and trends in thermal blanching-A comprehensive review

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Information Processing in Agriculture 2017年第2期4卷 101-127页

作者： Hong-Wei Xiao Zhongli Pan Li-Zhen Deng Hamed M.el-mashad Xu-Hai Yang Arun S.Mujumdar Zhen-Jiang Gao Qian Zhang College of Engineering China Agricultural UniversityP.O.Box 19417 Qinghua DongluBeijing 100083China College of Mechanical and electrical Engineering Shihezi UniversityShihezi 832001China Department of Biological and Agricultural Engineering University of CaliforniaOne Shields AvenueDavisCA 95616USA Department of Agricultural Engineering Mansoura UniversityMansouraEgypt Department of Bioresource Engineering McGill UniversitySte.Anne de BellevueQuebecCanada Healthy Processed Foods Research Unit USDA-ARS800 Buchanan St.AlbanyCA 94710USA

Thermal blanching is an essential operation for many fruits and vegetables *** not only contributes to the inactivation of polyphenol oxidase(PPO),peroxidase(POD),but also affects other quality attributes of *** we review the current status of thermal ***,the purposes of blanching,which include inactivating enzymes,enhancing drying rate and product quality,removing pesticide residues and toxic constituents,expelling air in plant tissues,decreasing microbial load,are ***,the reason to why indicators such as POD and PPO,ascorbic acid,color,and texture are frequently used to evaluate blanching process is *** that,the principles,applications and limitations of current thermal blanching methods,which include conventional hot water blanching,steam blanching,microwave blanching,ohmic blanching,and infrared blanching are ***,future trends are identified and discussed.

关键词： Thermal blanching Hot water blanching Microwave blanching Steam blanching Ohmic blanching Infrared blanching

Revision on the Recent Diagnostic Strategies of Fungal Infections

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Open Journal of Medical Microbiology 2017年第1期7卷 29-40页

作者： Amina Mostafa Abd el-Aal Noha el-mashad Al-Shaymaa Nasr Mohamed Department of Clinical Pathology Faculty of Medicine Mansoura University Mansoura Egypt Department of Clinical Pathology Aga Central Hospital Mansoura Egypt

Many invasive fungal diseases have no characteristic signs or symptoms, and may give negative blood cultures;therefore, clinician may decide to start empirical antifungal therapy particularly in high risk patient (e.g., hematopoietic stem cell transplant, solid organ transplant, and AIDS patients). This increases the incidence of appearance of resistant fungal strains to antifungal drugs. Traditional methods for diagnosis such as wet mount examination and microbiological cultures remain the gold standard methods for fungal disease diagnosis. However, they are time-consuming, insensitive, and have a limited impact on clinical decision-making. Significant progress has recently achieved in diagnostic tools of fungal disease. Antigen and antibody based assays, molecular techniques, and MALDI TOF spectrometry technique and nanotechnology offer more rapid, sensitive and accurate results.

关键词： Fungal Infections Conventional Diagnostic Techniques Mannan MALDI-TOF MS Molecular Diagnostic Techniques