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Impedance spectroscopy and DFT/TD-DFT studies of diyttrium trioxide for optoelectronic fields

Journal of Rare Earths 2023年第4期41卷 605-612页

作者： Ali A.Alkathiri A.A.Atta moamen S.Refat Sonam Shakya A.m.Hassanien Saud A.Algarni emad m.a.ahmed Sultan E.Alomariy mohammed Alsawat Norah Algethami Department of Physics College of ScienceTaif UniversityP.O.Box 11099Taif21944Saudi Arabia Department of Chemistry College of ScienceTaif UniversityP.O.Box 11099Taif21944Saudi Arabia Department of Chemistry Aligarh Muslim UniversityAligarh202002India Department of Physics Faculty of Science and Humanity Studies at Al-QuwayiyahShaqra UniversityAl-Quwayiyah11971Saudi Arabia

Yttrium(Ⅲ)oxide or so-called diyttrium trioxide(Y_2O_3)is an excellent candidate ceramic material for optoelectronic ***,electrical conductivity,and dielectric relaxation properties of bulk yttrium(Ⅲ)oxide were studied.X-ray diffraction(XRD)results indicate that the yttrium(Ⅲ)oxide compound has a crystalline cubic *** transform infrared(FTIR)technique was used to ascertain the chemical structure of the yttrium(Ⅲ)oxide *** spectroscopy was used to analyze frequency-dependent electrical properties as a function of temperature in the range of 303-423 K and frequency range of 0.1 Hz-2 *** spectroscopy parameters such as dielectric constant,dielectric loss,loss factor,electric modulus,and complex impedance of the yttrium(Ⅲ)oxide compound were *** Nyquist plot describes the complex impedance of the yttrium(Ⅲ)oxide for different *** universal Jonscher's power law was used for the analysis of the complex electrical conductivity of the yttrium(Ⅲ)oxide *** is found that the real(σ')and imaginary(σ")parts of the complex conductivity increase with increasing *** exponent frequency(s)equals unity,which confirms that the predominant conduction mechanism is a nearly constant loss(NCL)***/TD-DFT studies using B3LYP/LanL2DZ level of theory were used to provide comparable theoretical data and electronic energy gap of HOmO→LUmO.

关键词： Yttrium(Ⅲ)oxidel Impedance spectroscopy DFT/TD-DFT Rare earths

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Disturbance Evaluation in Power System Based on machine Learning

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Computers, materials & Continua 2022年第4期71卷 231-254页

作者： emad m.ahmed mohamed A.ahmed Ziad m.Ali Imran Khan Department of Electrical Engineering College of EngineeringJouf UniversitySakaka72388Al-JoufSaudi Arabia Department of Electrical Engineering College of EngineeringPrince Sattam bin Abdulaziz UniversityWadi Addawaser11991Saudi Arabia Department of Electrical Engineering Aswan Faculty of EngineeringAswan UniversityAswan81542Egypt Department of Electrical Engineering University of Engineering and Technology PeshawarPakistan

The operation complexity of the distribution system increases as a large number of distributed generators(DG)and electric vehicles were introduced,resulting in higher demands for fast online reactive power *** a power system,the characteristic selection criteria for power quality disturbance classification are not *** classification effect and efficiency needs to be improved,as does the generalization *** order to categorize the quality in the power signal disturbance,this paper proposes a multi-layer severe learning computer auto-encoder to optimize the input weights and extract the characteristics of electric power quality ***,a multi-label classification algorithm based on rating is proposed to understand the relationship between the labels and identify the various power quality *** two algorithms are combined to construct a multi-label classification model based on a multi-level extreme learning machine,and the optimal network structure of the multi-level extreme learning machine as well as the optimal multi-label classification threshold are *** proposed method can be used to classify the single and compound power quality disturbances with improved classification effect,reliability,robustness,and anti-noise performance,according to the experimental *** hamming loss obtained by the proposed algorithm is about 0.17 whereas mL-RBF,SVm and mL-KNN schemes have 0.28,0.23 and 0.22 respectively at a noise intensity of 20 *** average precision obtained by the proposed algorithm 0.85 whereas the mL-RBF,SVm and mL-KNN schemes indicates 0.7,0.77 and 0.78 respectively.

关键词： Optimal power flow optimization algorithm deep learning power systems

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Application of 3D Static modelling in Reservoir Characterization:A Case Study from the Qishn Formation in Sharyoof Oil Field,masila Basin,Yemen

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Acta Geologica Sinica(English Edition) 2022年第1期96卷 348-368页

作者： emad A.ABDULLAH ahmed ABDELmAKSOUD musab A.HASSAN Department of mineral Developing and Oil&Gas Engineering Academy of EngineeringPeople’s Friendship University of Russia(RUDN University)Moscow 117198Russia Department of Earth Sciences Khalifa UniversityAbu Dhabi 127788United Arab Emirates Department of Geology Faculty of ScienceAssiut UniversityAssiut 71516Egypt

Three-dimensional(3 D)static modelling techniques are applied to the characterization of the Qishn Formation(Fm.)in the Sharyoof oil field locating within the masila basin,southeastern *** present study was initiated by the seismic structural interpretation,followed by building a 3 D structural framework,in addition to analysing well log data and from these,3 D facies and petrophysical models are *** the Sharyoof oil field,the Qishn *** depth values within the range of 400-780 m below sea level,with a general increase towards the SSE.A set of high dip angle normal faults with a general ENE-WSW trend dissect the *** strata are also folded as a main anticline with an axis that is parallel to the fault trend,formed as a result of basement *** to the facies models,the Qishn *** 43.83% limestone,21.53% shale,21.26% sandstone,13.21% siltstone and 0.17% *** Qishn Carbonates member has low porosity values making it a potential seal for the underlying reservoirs whereas the Upper Qishn Clastics SI A and C have good reservoir quality and SIB has fair reservoir *** Upper Qishn Clastics S2 and S3 also have fair reservoir quality,while the Lower Qishn Clastics zone has good reservoir *** water saturation decreases towards the west and east and increases towards north and *** total original oil in-place(OOIP)of the Upper Qishn clastics is 106 million STB within the SI A,SIC and S2 *** of development wells is recommended in the eastern study area,where good trapping configuration is exhibited in addition to the presence of a potential seal(Upper Qishn Carbonates member)and reservoir(Qishn Clastics member)with high porosity and low water saturation.

关键词： upstream exploration petroleum basins seismic interpretation structural modelling well log analysis facies modelling petrophysical modelling Sayun-masila basin

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An Optimal DF Based method for Transient Stability Analysis

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Computers, materials & Continua 2022年第2期70卷 3449-3471页

作者： Z.A.Zaki emad m.ahmed Ziad m.Ali Imran Khan Department of Electrical Engineering College of EngineeringJouf UniversitySakaka2014Al-JoufSaudi Arabia Electrical Engineering Department College of EngineeringPrince Sattam bin Abdulaziz UniversityWadi Addawaser11991Saudi Arabia Electrical Engineering Department Aswan Faculty of EngineeringAswan UniversityAswan81542Egypt Department of Electrical Engineering University of Engineering and Technology PeshawarPakistan

The effect of energy on the natural environment has become increasingly severe as human consumption of fossil energy has *** capacity of the synchronous generators to keep working without losing synchronization when the system is exposed to severe faults such as short circuits is referred to as the power system’s transient *** the power system’s safe and stable operation and mechanism of action become more complicated,higher demands for accurate and rapid power system transient stability analysis are *** methods for analyzing transient stability are less accurate because they do not account formisclassification of unstable *** a result,this paper proposes a novel approach for analyzing transient *** key concept is to use deep forest(DF)and a neighborhood rough reduction approach *** the neighborhood rough sets,the original feature space is obtained by creating many optimal feature subsets at various granularity ***,by deploying the DF cascade structure,the mapping connection between the transient stability state and the features is *** weighted voting technique is used in the learning process to increase the classification accuracy of unstable *** contrasted to current methods,simulation results indicate that the proposed approach outperforms them.

关键词： Transient stability analysis power system cascade structure optimal power flow

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Space time fractional KdV Burgers equation for dust acoustic shock waves in dusty plasma with non-thermal ions

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Chinese Physics B 2014年第7期23卷 316-322页

作者： emad K.El-Shewy Abeer A.mahmoud Ashraf m.Tawfik Essam m.Abulwafa ahmed Elgarayhi Theoretical Physics Group Physics DepartmentFaculty of ScienceMansoura University

The KdV-Burgers equation for dust acoustic waves in unmagnetized plasma having electrons, singly charged non- thermal ions, and hot and cold dust species is derived using the reductive perturbation method. The Boltzmann distribution is used for electrons in the presence of the cold （hot） dust viscosity coefficients. The semi-inverse method and Agrawal variational technique are applied to formulate the space-time fractional KdV-Burgers equation which is solved using the fractional sub-equation method. The effect of the fractional parameter on the behavior of the dust acoustic shock waves in the dusty plasma is investigated.

关键词： dust-acoustic waves reductive perturbation method modified Riemann-Liouville fractionalderivative space-time fractional KdV-Burgers equation

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Nonlinear dynamical wave structures of Zoomeron equation for population models

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Chinese Physics B 2022年第6期31卷 235-240页

作者： Ahmet Bekir emad H m Zahran Neighbourhood of Akcaglan Imarli StreetNumber:28/426030EskisehirTurkey Departments of mathematical and Physical Engineering Benha UniversityFaculty of EngineeringShubraEgypt

The nonlinear dynamical exact wave solutions to the non-fractional order and the time-fractional order of the biological population models are achieved for the first time in the framwork of the Paul-Painlevéapproach method(PPAm).When the variables appearing in the exact solutions take specific values,the solitary wave solutions will be easily *** realized results prove the efficiency of this technique.

关键词： (2+1)-dimensional non-fractional Zoomeron equation time-fractional biological population model Paul-Painlevéapproach method traveling wave solutions

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Numerical Treatments for Crossover Cancer model of Hybrid Variable-Order Fractional Derivatives

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Computer modeling in Engineering & Sciences 2024年第8期140卷 1619-1645页

作者： Nasser Sweilam Seham Al-mekhlafi Aya ahmed Ahoud Alsheri emad Abo-Eldahab mathematics Department Faculty of ScienceCairo UniversityGiza12613Egypt mathematics Department Faculty of EducationSana’a UniversitySana’a1247Yemen mathematics Department Faculty of ScienceHelwan UniversityCairo11795Egypt Department of mathematics College of ScienceUniversity of BishaAl Namas67398-5644Saudi Arabia

In this paper,two crossover hybrid variable-order derivatives of the cancer model are ***ünwald-Letnikov approximation is used to approximate the hybrid fractional and variable-order fractional *** existence,uniqueness,and stability of the proposed model are *** Bashfourth’s fifth-step method with a hybrid variable-order fractional operator is developed to study the proposed *** studies with generalized fifth-order Runge-Kutta method are *** examples and comparative studies to verify the applicability of the used methods and to demonstrate the simplicity of these approximations are *** have showcased the efficiency of the proposed method and garnered robust empirical support for our theoretical findings.

关键词： Cancer diseases hybrid variable-order fractional derivatives adams bashfourth fifth step generalized fifth order Runge-Kutta method

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Updates in the pathophysiological mechanisms of Parkinson's disease: Emerging role of bone marrow mesenchymal stem cells

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World Journal of Stem Cells 2016年第3期8卷 106-117页

作者： Hanaa H ahmed ahmed m Salem Hazem m Atta emad F Eskandar Abdel Razik H Farrag mohamed A Ghazy Neveen A Salem Hadeer A Aglan Department Medical Research Division National Research Centre Biochemistry Department Faculty of Science Ain Shams University Clinical Biochemistry Department Faculty of Medicine King Abdulaziz University medical Biochemistry and molecular Biology Department Faculty of Medicine Cairo University Pathology Department Medical Research Division National Research Centre Narcotics Ergogenic aids and Poisons Department Medical Research Division National Research Centre

AIm: To explore the approaches exerted by mesenchymal stem cells (mSCs) to improve Parkinson’s disease (PD) ***: mSCs were harvested from bone marrow of femoral bones of male rats, grown and propagated in culture. Twenty four ovariectomized animals were classified into 3 groups: Group (1) was control, Groups (2) and (3) were subcutaneously administered with rotenone for 14 d after one month of ovariectomy for induction of PD. Then, Group (2) was left untreated, while Group (3) was treated with single intravenous dose of bone marrow derived mSCs (Bm-mSCs). SRY gene was assessed by PCR in brain tissue of the female rats. Serum transforming growth factor beta-1 (TGF-β1), monocyte chemoattractant protein-1 (mCP-1) and brain derived neurotrophic factor (BDNF) levels were assayed by ELISA. Brain dopamine DA level was assayed fluorometrically, while brain tyrosine hydroxylase (TH) and nestin gene expression were detected by semi-quantitative real time PCR. Brain survivin expression was determined by immunohistochemical procedure. Histopathological investigation of brain tissues was also ***: Bm-mSCs were able to home at the injured brains and elicited significant decrease in serum TGF-β1 (489.7 ± 13.0 vs 691.2 ± 8.0, P mCP-1 (89.6 ± 2.0 vs 112.1 ± 1.9, P m BDNF (3663 ± 17.8 vs 2905 ± 72.9, P mber of positive cells for survivin (293.2 ± 15.9 vs 271.5 ± 15.9, P > 0.05) expression. Finally, the brain sections showed intact histologica

关键词： Parkinson’s disease Pathophysiology Bone marrow derived mesenchymal stem cells Rotenone Anti-inflammatory action Ovariectomy Anti-apoptotic effect Neurogenic potential

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Predicting the impacts of climate change on the distribution of moringa peregrina(Forssk.)Fiori-A conservation approach

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Journal of mountain Science 2021年第5期18卷 1235-1245页

作者： emad A.FARAHAT Aliaa m.REFAAT Botany and microbiology Department Faculty of ScienceHelwan UniversityCairo 11795Egypt Botany Department Faculty of ScienceAin Shams UniversityCairo 11566Egypt

Climate change will affect the geographic distribution and richness of species at different spatial and temporal *** applied maximum entropy(maxEnt)modeling to predict the potential influence of climatic change on the current and future distribution of the important mountainous tree species moringa peregrina(Forssk.)*** maxent model performed better than random models for the species with the training and test AUC(Area Under the receiver-operating characteristic Curve)values of 0.96 and 0.90,*** test and response curves showed that the distribution of the species negatively correlates with higher altitudes and precipitation in October and ***,it positively correlates with the total annual precipitation and precipitation in *** current and future climatic conditions,our model predicted habitat gains for *** towards the coastal northern and southern limits of its *** potentially suitable habitats,under future climate projections,are currently characterized by elevations ofm *** total annual precipitation of 80-225 mm/*** and high potential habitat suitability will increase by 5.6%-6%and 2.1%-2.3%,under RCP2.6 and RCP4.5 scenario,*** results indicated that the habitat suitability of *** would increase with increasing climate warming,particularly under RCP2.6 *** recommend sustainable conservation and cultivation of moringa peregrina in its current habitats along the Red Sea mountains.

关键词： Climate change Conservation max Ent mountains moringa peregrina Arid lands

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Numerical Analysis of Bacterial meningitis Stochastic Delayed Epidemic model through Computational methods

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Computer modeling in Engineering & Sciences 2024年第10期141卷 311-329页

作者： Umar Shafique mohamed mahyoub Al-Shamiri Ali Raza emad Fadhal muhammad Rafiq Nauman ahmed Department of mathematics National College of Business Administration and EconomicsLahore54660Pakistan Department of mathematics Applied CollegeMahayl AssirKing Khalid UniversityAbha62529Saudi Arabia Department of Physical Sciences The University of ChenabGujrat50700Pakistan Department of mathematics&Statistics College of ScienceKing Faisal UniversityP.O.Box 400Al-Ahsa31982Saudi Arabia Department of Computer Science and mathematics Lebanese American UniversityBeirut1102-2801Lebanon Department of mathematics Faculty of Science and TechnologyUniversity of Central PunjabLahore54000Pakistan Department of mathematics and Statistics University of LahoreLahore54000Pakistan

Based on theWorld Health Organization(WHO),meningitis is a severe infection of the meninges,the membranes covering the brain and spinal *** is a devastating disease and remains a significant public health *** study investigates a bacterial meningitis model through deterministic and stochastic ***-compartment population dynamics explain the concept,particularly the susceptible population,carrier,infected,and *** model predicts the nonnegative equilibrium points and reproduction number,i.e.,the meningitis-Free Equilibrium(mFE),and meningitis-Existing Equilibrium(mEE).For the stochastic version of the existing deterministicmodel,the twomethodologies studied are transition probabilities and non-parametric ***,positivity,boundedness,extinction,and disease persistence are studiedrigorouslywiththe helpofwell-known *** and nonstandard techniques such as Eulermaruyama,stochastic Euler,stochastic Runge Kutta,and stochastic nonstandard finite difference in the sense of delay have been presented for computational analysis of the stochastic ***,standard methods fail to restore the biological properties of the model,so the stochastic nonstandard finite difference approximation is offered as an efficient,low-cost,and independent of time step *** addition,the convergence,local,and global stability around the equilibria of the nonstandard computational method is studied by assuming the perturbation effect is *** simulations and comparison of the methods are presented to support the theoretical results and for the best visualization of results.

关键词： Bacterial meningitis disease stochastic delayed model stability analysis extinction and persistence computational methods

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