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

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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

Advanced Functional Electromagnetic Shielding Materials:A Review Based on Micro‑Nano Structure Interface Control of Biomass Cell Walls

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Nano-Micro Letters 2025年第1期17卷 98-134页

作者： Yang Shi Mingjun Wu Shengbo Ge Jianzhang Li Anoud saud Alshammari Jing Luo Mohammed A.Amin Hua Qiu Jinxuan Jiang Yazeed M.Asiri Runzhou Huang Hua Hou Zeinhom M.El‑Bahy Zhanhu Guo Chong Jia Kaimeng Xu Xiangmeng Chen Co‑Innovation Center of Efficient Processing and Utilization of Forest Resources College of Materials Science and EngineeringNanjing Forestry UniversityNanjing 210037People’s Republic of China State Key Laboratory of Efficient Production of Forest Resourced Beijing Forestry UniversityQinghua East Road 35Haidian DistrictBeijing 100083People’s Republic of China Department of Physics Faculty of Sciences‑ArarNorthern Border UniversityArar 91431Saudi Arabia Department of Chemistry College of ScienceTaif UniversityP.O.Box 1109921944 TaifSaudi Arabia Shaanxi Key Laboratory of Macromolecular Science and Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’anShaanxi 710072People’s Republic of China Integrated Composites Lab Department of Mechanical and Construction EngineeringNorthumbria UniversityNewcastle Upon Tyne NE18STUK College of Materials Science and Engineering Taiyuan University of Science and TechnologyTaiyuan 030024People’s Republic of China Department of Chemistry Faculty of ScienceAl-Azhar UniversityNasr CityCairo 11884Egypt Yunnan Provincial Key Laboratory of Wood Adhesives and Glued Products International Joint Research Center for Biomass MaterialsSouthwest Forestry UniversityKunming 650224People’s Republic of China School of Science Henan Agricultural UniversityZhengzhou 450002People’s Republic of China

Research efforts on electromagnetic interference(EMI)shielding materials have begun to converge on green and sustainable biomass *** materials offer numerous advantages such as being lightweight,porous,and *** to their porous nature,interfacial compatibility,and electrical conductivity,biomass materials hold significant potential as EMI shielding *** concerted efforts on the EMI shielding of biomass materials have been reported,this research area is still relatively new compared to traditional EMI shielding *** particular,a more comprehensive study and summary of the factors influencing biomass EMI shielding materials including the pore structure adjustment,preparation process,and micro-control would be *** preparation methods and characteristics of wood,bamboo,cellulose and lignin in EMI shielding field are critically discussed in this paper,and similar biomass EMI materials are summarized and *** composite methods and fillers of various biomass materials were *** paper also highlights the mechanism of EMI shielding as well as existing prospects and challenges for development trends in this field.

关键词： Biomass materials Electromagnetic interference shielding Micro-nano structure interface control Conductivity

A brief illustration of the official national standards for the safe useof cupping therapy (Hijama) in saudi Arabia

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Journal of Integrative Medicine 2018年第5期16卷 297-298页

作者： Tamer Aboushanab saud AlSanad National Center for Complementary and Alternative Medicine Riyadh 11662 Saudi Arabia National Center for Complementary Medicine Ministry of Health Riyadh 11662 Saudi Arabia College of Medicine AI Imam Mohammad Ibn Saud Islamic University Riyadh 11662 Saudi Arabia

Cupping therapy （Hijama in Arabic） is a popular traditional treatment especially in Asia, the Middle East and Central Europe. Traditionally, cupping therapy has been one of the most used practices in saudi Arabia. Standardization of the practice of cupping therapy is a very important step to eliminate or reduce any adverse events related to cupping. This article gives a brief illustration and highlights the important points of the first accredited saudi Arabian standards for the safe use of cupping equipment and its applications.

关键词： Cupping Hijama Standards Safety Equipment

Germination Quality Prognosis: Classifying Spectroscopic Images of the Seed Samples

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Intelligent Automation & Soft Computing 2023年第2期35卷 1815-1829页

作者： saud S.Alotaibi Department of Information Systems College of Computer and Information SystemsUmm Al-Qura UniversityMakkahSaudi Arabia

One of the most critical objectives of precision farming is to assess the germination quality of *** models contribute to thisﬁeld primarily through the use of artiﬁcial intelligence techniques such as machine learning,which present difﬁculties in feature extraction and optimization,which are critical factors in predicting accuracy with few false alarms,and another signiﬁcant dif-ﬁculty is assessing germination ***,the majority of these contri-butions make use of benchmark classiﬁcation methods that are either inept or too complex to train with the supplied *** manuscript addressed these issues by introducing a novel ensemble classiﬁcation strategy dubbed“Assessing Germination Quality of Seed Samples(AGQSS)by Adaptive Boosting Ensemble Classiﬁcation”that learns from quantitative phase features as well as universal features in greyscale spectroscopic *** experimental inquiry illustrates the signiﬁcance of the proposed model,which outperformed the currently avail-able models when performance analysis was performed.

关键词： Precision farming ensemble classiﬁcation germination quality machine learning predictive analytics

Propagation of waves over a rugged topography

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Journal of Ocean Engineering and Science 2022年第1期7卷 14-28页

作者： Mohammad saud Afzal Lalit Kumar Department of civil engineering Indian Institute of TechnologyKharagpurIndia

The propagation of waves in shallow waters is affected by the bottom topography unlike deep water waves of the coastal *** to the interaction of the wave with bed topography,the wave transformation processes ***,diffraction,shoaling,and breaking are the wave transforma-tion processes that occur in the coastal *** significant wave height over rugged topography is a standardized statistics to denote the characteristic height of the random waves in a sea ***-fore,the objective of the present study is to predict the significant wave height over rugged *** SWAN standalone and SWAN DHH platform are used to predict significant wave height over rugged topography in Mehamn harbour,*** SWAN model results are almost similar to the lab data of Vold and Lothe(2009)for all the 22 scenarios at all the output ***,the four cases reported by Taehun(2011)and lab data from Vold and Lothe(2009)for that four cases are compared with the SWAN model *** is observed that the SWAN model results are much closer to the lab data of Vold and Lothe(2009).

关键词： Wave propagation SWAN Bathymetry Significant wave height and Peak wave period

Internet of Things Enabled DDoS Attack Detection Using Pigeon Inspired Optimization Algorithm with Deep Learning Approach

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Computers, Materials & Continua 2024年第9期80卷 4047-4064页

作者： Turki Ali Alghamdi saud S.Alotaibi Department of Computer Science and Artificial Intelligence College of ComputingUmm Al-Qura UniversityMakkah21955Saudi Arabia

Internet of Things(IoTs)provides better solutions in various fields,namely healthcare,smart transportation,home,*** Denial of Service(DoS)outbreaks in IoT platforms is significant in certifying the accessibility and integrity of IoT *** learning(DL)models outperform in detecting complex,non-linear relationships,allowing them to effectually severe slight deviations fromnormal IoT activities that may designate a DoS *** uninterrupted observation and real-time detection actions of DL participate in accurate and rapid detection,permitting proactive reduction events to be executed,hence securing the IoT network’s safety and ***,this study presents pigeon-inspired optimization with a DL-based attack detection and classification(PIODL-ADC)approach in an IoT *** PIODL-ADC approach implements a hyperparameter-tuned DL method for Distributed Denial-of-Service(DDoS)attack detection in an IoT ***,the PIODL-ADC model utilizes Z-score normalization to scale input data into a *** handling the convolutional and adaptive behaviors of IoT,the PIODL-ADCmodel employs the pigeon-inspired optimization(PIO)method for feature selection to detect the related features,considerably enhancing the recognition’s ***,the Elman Recurrent Neural Network(ERNN)model is utilized to recognize and classify DDoS ***,reptile search algorithm(RSA)based hyperparameter tuning is employed to improve the precision and robustness of the ERNN method.A series of investigational validations is made to ensure the accomplishment of the PIODL-ADC *** experimental outcome exhibited that the PIODL-ADC method shows greater accomplishment when related to existing models,with a maximum accuracy of 99.81%.

关键词： Internet of things denial of service deep learning reptile search algorithm feature selection

Computational fluid dynamics modeling of abutment scour under steady current using the level set method

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International Journal of Sediment Research 2020年第4期35卷 355-364页

作者： Mohammad saud Afzal Hans Bihs Lalit Kumar Department of Civil Engineering Indian Institute of Technology Department of Civil and Environmental Engineering Norwegian University of Science and Technology

The scour and deposition pattern around an abutment under constant discharge condition is calculated using a three dimensional(3D) Computational Fluid Dynamics(CFD) *** Reynolds-Averaged Navier Stokes(RANS) equations are solved in three dimensions using a CFD *** Level Set Method(LSM) is used for calculation of both free surface and bed *** two-equation turbulence model(k-ε and k-ω) is used to calculate the eddy viscosity in the RANS *** pressure term in the RANS equations on a staggered grid is modeled using the Chorin’s projection *** 5th order Weighted Essentially Non-Oscillatory(WENO) scheme discretizes the convective term of the RANS *** Kovacs and Parker and Dey formulations are used for the reduction in bed shear stress on the sloping *** model also used the sandslide algorithm which limits bed shear stress reduction during the erosion *** numerical model solution is validated against experimental results collected at the Politecnico di Milano,Milan,*** r,the numerical model is tested for perfo rmance by varying the grid sizes and key parameters like the space and time discretization *** effect of varying bed porosity has been ***,the free surface is well represented in a realistic manner and bed topography is well predicted using the Level Set Method(LSM).

关键词： Sediment transport Computational Fluid Dynamics(CFD) Reynolds-Averaged Navier Stokes(RANS) Level Set Method(LSM) Weighted Essentially Non-Oscillatory(WENO) Total Variation Diminishing(TVD)

Solving Fractional Differential Equations via Fixed Points of Chatterjea Maps

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Computer Modeling in Engineering & Sciences 2023年第6期135卷 2617-2648页

作者： Nawab Hussain saud M.Alsulami Hind Alamri Department of Mathematics King Abdulaziz UniversityP.O.Box 80203Jeddah21589Saudi Arabia Department of Mathematics College of ScienceTaif UniversityP.O.Box 11099Taif21944Saudi Arabia

In this paper,we present the existence and uniqueness of fixed points and common fixed points for Reich and Chatterjea pairs of self-maps in complete metric ***,we study fixed point theorems for Reich and Chatterjea nonexpansive mappings in a Banach space using the Krasnoselskii-Ishikawa iteration method associated withSλand consider some applications of our results to prove the existence of solutions for nonlinear integral and nonlinear fractional differential *** also establish certain interesting examples to illustrate the usability of our results.

关键词： Common fixed points Reich and Chatterjea mappings Krasnoselskii-Ishikawa iteration complete metric space Banach space integral equation nonlinear fractional differential equation

Eye rubbing-induced changes in intraocular pressure and corneal thickness measured at five locations, in subjects with ocular allergy

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International Journal of Ophthalmology(English edition) 2015年第1期8卷 81-88页

作者： Uchechukwu L.Osuagwu saud A.Alanazi Visual and Ophthalmic Optics Group (Chronic Disease&Ageing Domain) Institute of Health&Biomedical InnovationSchool of Optometry&Vision SciencesQueensland University of Technology Department of Optometry & Vision Sciences College of Applied Medical Sciences King Saud University

AIM: To assess the effects of eye rubbing on corneal thickness(CT) and intraocular pressure(IOP)measurements obtained 0-30 min after habitual eye rubbing in symptomatic ***: Measurements of IOP and CT were obtained at five locations(central, temporal, superior,nasal and inferior) before, and every 5min for 30 min interval after 30 s of eye rubbing, for 25 randomly selected eyes of 14 subjects with ocular allergy and 11age-matched normals. Differences in measurements were calculated in each group [Baseline measurements minus measurements recorded at each time interval after eye rubbing(for IOP), and for each corneal location(for CT)]and comparison were then made between groups(allergic versus control) for differences in any observed ***: Within groups, baseline mean IOPs in the allergic patient-group(14.2 ±3.0 mm Hg) and in the control group(13.1±1.9 mm Hg) were similar at all times,after eye rubbing(P >0.05, for all). The maximum reduction in IOP was 0.8 mm Hg in the control subjects and the maximum increase was also 0.8 mm Hg in the allergic subjects. Between groups(allergic versus control), the changes in IOP remained under 1 mm Hg at all times(P =0.2) after 30 min of eye rubbing. Between 0and 30 min of CT measurements after eye rubbing, the mean central CT(CCT), inferior CT(ICT), superior CT(SCT), temporal CT(TCT) and nasal CT(NCT) did not vary significantly from baseline values in the control and allergic-subject groups(P >0.05, for both). Between both groups, changes in CT were similar at all locations(P >0.05)except for the TC which was minimally thinner by about4.4 μm(P =0.001) in the allergic subjects than in the control subjects, 30 min following 30 s of eye ***: IOP measured in allergic subjects after30 s of habitual eye rubbing was comparable with that obtained in normal subjects at all times between 0 and30 min. Although, CT in the allergic subjects were similar to those of the control subjects at all time

关键词： allergy corneal thickness intraocular pressure eye rubbing tonometry pachymetry