检索结果-南通市图书馆

Journal of Rare Earths 2018年第12期36卷 1299-1309页

作者： R. Rajesh kanna k. sakthipandi s.M.seeni mohamed Aliar Maraikkayar N. Lenin M. sivabharathy Department of Physics Sethu Institute of Technology Department of Computer science and Engineering Sethu Institute of Technology

Copper and rare earth-doped(RE = La, Gd, Nd) CuFe1.85RE0.15O4nano ferrites were prepared using the so nochemical method. The effective doping of rare-earth(La3+, Nd3+, Gd3+) ions with copper nanoferrites was confirmed by X-ray diffraction. The tetrahedral and octahedral sites of the nano ferrites were identified through the Fourier transform infrared spectra. The doping of rare-earth elements enhances the optical bandgap energy of the nanoferrites that are observed through Ultraviolet-DRs spectra. The oxidation state of the elements Cu 2 p, La 3 d, Nd 3 d, Gd 3 d, Fe 2 p and O 1 s was analyzed. scanning electron microscopy images indicate a spherical morphology with agglomeration to some elongate. The values of dielectric constant and conductivity decrease considerably due to doping rare-earth ions in copper nanoferrites. Low saturation magnetization and high coercivity values of rare earth-doped copper nanoferrites are observed from the typical hysteresis curves.

关键词： Nanoferrites Optical properties Dielectric response Magnetic measurements Rare earths

Fe_(3)O_(4)-carbon spheres core–shell supported palladium nanoparticles:A robust and recyclable catalyst for suzuki coupling reaction

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2022年第11期51卷 75-85页

作者： mohamed A.Almaradhi Hassan M.A.Hassan Mosaed s.Alhumaimess Department of Chemistry College of ScienceJouf UniversityPO Box 2014SakakaSaudi Arabia

suzuki-Miyaura(s-M)is regarded the most powerful way for synthesis biaryls,triaryls,or incorporating of substituted aryl moieties in organic preparation by the cross-coupling of aryl boronic acid with aryl halides using the Pd *** work reports the combining of the hydrothermal and microwaveassisted protocol to convert the glucose to magnetic carbon spheres(Fe_(3)O_(4)-CsPs)decorated with Pd nanoparticles(NPs)as the catalyst for suzuki-Miyaura cross-coupling *** physicochemical properties in the produced composite were examined using FEsEM,HRTEM,nitrogen isotherms,Raman spectroscopy,FTIR,XPs,and *** as-fabricated composite Pd/Fe_(3)O_(4)-CsPs is mostly spherical with a core–shell structure and possesses a great surface area of 253.2 m^(2).g^(-1).Its catalytic performance demonstrates that the composite has excellent stability and high tolerance suzuki-Miyaura crosscoupling reactions in 30 min at 80℃.Both activated and deactivated aryl halides provided excellent *** as-fabricated catalyst was recycled for up to four catalytic cycles without a substantial decline in ***,this research offers a facile roadmap for synthesizing Pd/Fe_(3)O_(4)-CsPs composites and promoting the practical implementation of Pd/Fe_(3)O_(4)-CsPs catalysts for organic transformation processes.

关键词： Heterogeneous catalysis Aryl halide suzuki coupling Palladium nanoparticles Carbon spheres

Real-time stereo matching on CUDA using Fourier descriptors and dynamic programming

在线全文

学校读者我要写书评

暂无评论

Computational Visual Media 2019年第1期5卷 59-71页

作者： mohamed Hallek Fethi smach mohamed Atri Faculty of sciences of Monastir Technologies et services de l'information

Computation of stereoscopic depth and disparity map extraction are dynamic research topics.A large variety of algorithms has been developed,among which we cite feature matching, moment extraction, and image representation using descriptors to determine a disparity map. This paper proposes a new method for stereo matching based on Fourier descriptors. The robustness of these descriptors under photometric and geometric transformations provides a better representation of a template or a local region in the image. In our work, we specifically use generalized Fourier descriptors to compute a robust cost ***, a box filter is applied for cost aggregation to enforce a smoothness constraint between neighboring pixels. Optimization and disparity calculation are done using dynamic programming, with a cost based on similarity between generalized Fourier descriptors using Euclidean distance. This local cost function is used to optimize correspondences. Our stereo matching algorithm is evaluated using the Middlebury stereo benchmark; our approach has been implemented on parallel high-performance graphics.hardware using CUDA to accelerate our algorithm, giving a real-time implementation.

关键词： generalized Fourier descriptors stereo matching dynamic programming CUDA

Phase-junction Ag/TiO_(2)nanocomposite as photocathode for H_(2)generation

在线全文

学校读者我要写书评

暂无评论

Journal of Materials science & Technology 2021年第24期83卷 179-187页

作者： Hemdan s.H.mohamed mohamed Rabia Xian-Gang Zhou Xu-sen Qin Gomaa khabiri mohamed shaban Hussein A.Younus s.Taha Zhi-Yi Hu Jing Liu Yu Li Bao-Lian su state key Laboratory of Advanced Technology for Materials synthesis and Processing Wuhan University of TechnologyWuhan430070China Physics Department Faculty of ScienceFayoum UniversityFayoum63514Egypt Nanophotonics and Applications Lab Physics DepartmentFaculty of ScienceBeni-Suef UniversityBeni-Suef62514Egypt Chemistry Department Faculty of ScienceFayoum UniversityFayoum63514Egypt Nanostructure Research Centre(NRC) Wuhan University of TechnologyWuhan430070China Laboratory of Inorganic Materials Chemistry(CMI) University of Namur61 rue de Bruxelles5000NamurBelgium

Developing anatase/rutile phase-junction in Ti O_(2)to construct Z-scheme system is quite effective to improve its photoelectrochemical *** this work,the anatase/rutile phase-junction Ag/Ti O_(2)nanocomposites are developed as photocathodes for hydrogen *** optimized Ag/Ti O_(2)nanocomposite achieves a high current density of 1.28 m A cm-2,an incident photon-to-current conversion efficiency(IPCE)of 10.8%,an applied bias photon-to-current efficiency(ABPE)of 0.32 at 390 nm and a charge carriers’lifetime up to 2000 *** enhancement on photoelectrochemical activity can be attributed to:(ⅰ)the generated Z-scheme system in the anatase/rutile phase-junction Ag/Ti O_(2)photocathode enhances the separation,diffusion and transformation of electron/hole pairs inside the structure,(ⅱ)Ag nanodots modification in the anatase/rutile phases leading to the tuned band gap with enhanced light absorption and(ⅲ)the formed schottky barrier after Ag nanodots surface modification provides enough electron traps to avoid the recombination of photogenerated electrons and *** results here suggest that developing phase-junction nanocomposite as photocathode will provide a new vision for their enhanced photoelectrochemical generation of hydrogen.

关键词： Ag/TiO_(2)nanocomposites Anatase/rutile phase-junction Z-scheme Photocathode H2 generation

A robust multi-objective and multi-physics optimization of multi-physics behavior of microstructure

在线全文

学校读者我要写书评

暂无评论

Journal of Central south University 2016年第12期23卷 3225-3238页

作者： Hamda Chagraoui mohamed soula mohamed Guedri Research Unit in structural Dynamics Modeling and Engineering of Multi-Physics SystemsSDMESMNabeul Preparatory Engineering Institute-IPEINUniversity of Carthage Laboratory of Applied Mechanics and Engineering ENITDepartment of Mechanical engineering ENSITTunis University of Tunisia

A new strategy is presented to solve robust multi-physics multi-objective optimization problem known as improved multi-objective collaborative optimization （IMOCO） and its extension improved multi-objective robust collaborative （IMORCO）. In this work, the proposed IMORCO approach combined the IMOCO method, the worst possible point （WPP） constraint cuts and the Genetic algorithm NsGA-II type as an optimizer in order to solve the robust optimization problem of multi-physics of microstructures with uncertainties. The optimization problem is hierarchically decomposed into two levels： a microstructure level, and a disciplines levels, For validation purposes, two examples were selected： a numerical example, and an engineering example of capacitive micro machined ultrasonic transducers （CMUT） type. The obtained results are compared with those obtained from robust non-distributed and distributed optimization approach, non-distributed multi-objective robust optimization （NDMORO） and multi-objective collaborative robust optimization （McRO）, respectively. Results obtained from the application of the IMOCO approach to an optimization problem of a CMUT cell have reduced the CPU time by 44% ensuring a Pareto front close to the reference non-distributed multi-objective optimization （NDMO） approach （mahalanobis distance, D2M =0.9503 and overall spread, so=0.2309）. In addition, the consideration of robustness in IMORCO approach applied to a CMUT cell of optimization problem under interval uncertainty has reduced the CPU time by 23% keeping a robust Pareto front overlaps with that obtained by the robust NDMORO approach （D2M =10.3869 and so=0.0537）.

关键词： multi-physics multi-objective optimization robust optimization collaborative optimization non-distributed anddistributed optimization uncertainty interval

CERTAIN FAMILY OF INTEGRAL OPERATORs PREsERVING sUBORDINATION AND sUPERORDINATION

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica scientia 2014年第4期34卷 1166-1178页

作者： mohamed k.AOUF Teodor BULBOACA Tamer M.sEOUDY Department of Mathematics Faculty of ScienceMansoura UniversityMansoura 35516Egypt Faculty of Mathematics and Computer science Babes-Bolyai University 400084 Cluj-Napoca Department of Mathematics Faculty of ScienceFayoum UniversityFayoum 63514Egypt

We obtain subordination, superordination and sandwich-preserving new theorems for certain integral operators defined on the space of normalized analytic functions in the open unit disk. The sandwich-type theorem for t... 详细信息

关键词： analytic function, convex function differential subordination and supcrordination: subordination chain integral operator

Intelligent Deep Learning Based Disease Diagnosis Using Biomedical Tongue Images

在线全文

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2022年第3期70卷 5667-5681页

作者： V.Thanikachalam s.shanthi k.kalirajan sayed Abdel-khalek.mohamed Omri Lotfi M.Ladhar sri sivasubramaniya Nadar College of Engineering Chennai603110India Department of Information Technology Department of Electronics and Communication EngineeringCARE College of EngineeringTiruchirappalli620009India Department of Electronics and Communication Engineering KPR Institute of Engineering and TechnologyCoimbatore641407India Department of Mathematics and statistics College of ScienceTaif UniversityP.O.Box 11099Taif 21944Saudi Arabia Mathematics Department Faculty of ScienceSohag UniversitySohagEgypt Deanship of scientific Research King Abdulaziz UniversityJeddahSaudi Arabia Department of Electrical and Computer Engineering Faculty of EngineeringKing Abdulaziz UniversityJeddahSaudi Arabia

The rapid development of biomedical imaging modalities led to its wide application in disease ***-based diagnostic procedures are proficient and non-invasive in nature to carry out secondary diagnostic processes ***,physicians examine the characteristics of tongue prior to *** this scenario,to get rid of qualitative aspects,tongue images can be quantitatively inspected for which a new disease diagnosis model is *** model can reduce the physical harm made to the *** tongue image analytical methodologies have been proposed ***,there is a need exists to design an intelligent Deep Learning(DL)based disease diagnosis *** this motivation,the current research article designs an Intelligent DL-basedDisease Diagnosis method using Biomedical Tongue Images called IDLDD-BTI *** proposed IDLDD-BTI model incorporates Fuzzy-based Adaptive Median Filtering(FADM)technique for noise removal ***,squeezeNet model is employed as a feature extractor in which the hyperparameters of squeezeNet are tuned using Oppositional Glowworm swarm Optimization(OGsO)*** last,Weighted Extreme Learning Machine(WELM)classifier is applied to allocate proper class labels for input tongue color *** design of OGsO algorithm for squeezeNet model shows the novelty of the *** assess the enhanced diagnostic performance of the presented IDLDD-BTI technique,a series of simulations was conducted on benchmark dataset and the results were examined in terms of several *** resultant experimental values highlighted the supremacy of IDLDD-BTI model over other state-of-the-art methods.

关键词： Biomedical images image processing tongue color image deep learning squeezenet disease diagnosis

Origin and geochemical characteristics of beryllium mineralization in the Zabara-Wadi El Gemal region,south Eastern Desert,Egypt

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Geochimica 2024年第6期43卷 1105-1122页

作者： Gehad M.saleh Farrage M.khaleal Mohammed Z.El-Bialy mohamed s.kamar Mokhles k.Azer mohamed M.Omar mohamed N.El Dawy Ahmed Abdelaal El saeed R.Lasheen Nuclear Materials Authority El-MaadiP.O.Box 530CairoEgypt 2 Geology DepartmentFaculty of SciencePort Said UniversityPort Said 42522Egypt 3 Geological Sciences DepartmentNational Research CentreCairoEgypt 4 Environmental Sciences DepartmentFaculty of SciencePort Said UniversityPort Said 42522Egypt 5 Geology DepartmentFaculty of ScienceAl-Azhar UniversityP.O.Box 11884CairoEgypt

Beryl is the commercial source of beryllium and several varieties of it are valued as a *** contribute to understanding the mechanism of beryl formation,we carried out detailed geological,petrographical,and geochemical investigations on beryl mineralization occurrences in the Zabara-Wadi El Gemal(Z-WG)*** region is an NW-sE trending tract that includes six berylhosting *** green gem variety of beryl(emerald)is restricted to phlogopite schist,pegmatite,and quartz *** hexagonal emerald crystals are well-developed in phlogopite schist and *** gem variety emerald examined is sodic and *** contains high concentrations of chromophore transition elements ordering Cr(up to 1511 ppm)>V(up to 242 ppm)>sc(up to 245 ppm),giving rise to its vivid green color,refl ecting mafic-ultramafic source *** the investigated emeralds,the sikait area contains the highest BeO(av.10.76wt.%)*** compositional variability of emeralds is most likely attributed to the contribution from the host *** is revealed by the examined emerald mineralization,for instance;the Abu Rusheid area(one of the best areas exposing rare metal-bearing granitoids)possesses the highest average of trace and REEs *** contrast,Um kabu emerald has the highest contents of Co(av.20 ppm),Ni(av.299 ppm),MgO(av.8.2wt.%),Fe_(2)O_(3)(av.3.12wt.%),and CaO(avg.3.4wt.%)relative to other areas,which may be linked to contribution of ultramafic rocks exposed *** proposed mechanism we suggest for emerald genesis is metasomatic interaction between felsic intrusions,that are enriched with k,Na,Be,Li,and B,with mafic-ultramafic rocks that are enriched in Cr,V,Mg,Fe,and *** interaction is marked by the formation of phlogopite schist,the growth of emerald crystals,and desilicated pegmatite.

关键词： Beryl chemistry Emerald genesis Phlogopite schist Pegmatite Eastern Desert

spectrophotometric Determination of Albendazole Drug in Tablets： spectroscopic Characterization of the Chargetransfer solid Complexes

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2011年第2期29卷 324-332页

作者： Refat Moamen s mohamed Gehad G. Fathi Ahmed Department of Chemistry Faculty of Science Port Said University Port Said Egypt Department of Chemistry Faculty of Science Taif University 888 Taif Kingdom Saudi Arabia Chemistry Department Faculty of Science Cairo University Egypt

simple, rapid and reliable method for the determination of albendazole （ABZ） was described. This includes the utility of some π-acceptors such as 2,3-dichloro-5,6-dicyano-p-benzoquinone （DDQ） and 3,6-dichloro-2,5-dihydroxy-p-benzoquinone （p-CLA） for estimation of ABZ drug （act as donor）. The experimental conditions were optimized and the system obeys Beer＇s law for 7.50-80 and 10.00-85.00 ug·mL-1 of ABZ using DDQ and p-CLA, respectively. The molar absorptivity and sandell sensitivity were calculated to be 1.83× 10^3 and 1.12× 10^3 L·mol ·cm -1 and 2.60 and 3.40 ng·cm -2 using DDQ and p-CLA, respectively. The limits of detection and quantification were calculated to be （7.42 and 6.73） and （9.94 and 4.13） ug·mL-1 using DDQ and p-CLA, respectively. The proposed methods were successfully applied to the determination of ABZ in commercially available dosage forms. The reliability of the assays was established by parallel determination by the official method and recovery studies. The chemical structures of the solid charge-transfer （CT） complexes formed via reaction between ABZ under study and π-acceptors, have been elucidated using elemental analyses （C, H and N）, IR, 1H NMR and mass spectra.

关键词： albendazole DDQ p-CLA spectrophotometry charge-transfer complexes

Enhancing Renewable Energy Integration:A Gaussian-Bare-Bones Levy Cheetah Optimization Approach to Optimal Power Flow in Electrical Networks

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computer Modeling in Engineering & sciences 2024年第8期140卷 1339-1370页

作者： Ali s.Alghamdi mohamed A.Zohdy saad Aldoihi Department of Electrical Engineering College of EngineeringMajmaah UniversityAl-Majmaah11952Saudi Arabia Electrical and Computer Engineering Department Oakland UniversityRochesterMI48309USA Institute of Earth and space science King Abdulaziz City for Science and Technology(KACST)Riyadh11442Saudi Arabia Computer science and systems Engineering Institute Polytechnique de ParisPalaiseau CedexFrance

In the contemporary era,the global expansion of electrical grids is propelled by various renewable energy sources(REss).Efficient integration of stochastic REss and optimal power flow(OPF)management are critical for network *** study introduces an innovative solution,the Gaussian Bare-Bones Levy Cheetah Optimizer(GBBLCO),addressing OPF challenges in power generation systems with stochastic *** primary objective is to minimize the total operating costs of REss,considering four functions:overall operating costs,voltage deviation management,emissions reduction,voltage stability index(VsI)and power loss ***,a carbon tax is included in the objective function to reduce carbon *** scrutiny,using modified IEEE 30-bus and IEEE 118-bus systems,validates GBBLCO’s superior performance in achieving optimal *** results demonstrate GBBLCO’s efficacy in six optimization scenarios:total cost with valve point effects,total cost with emission and carbon tax,total cost with prohibited operating zones,active power loss optimization,voltage deviation optimization and enhancing voltage stability index(VsI).GBBLCO outperforms conventional techniques in each scenario,showcasing rapid convergence and superior solution ***,GBBLCO navigates complexities introduced by valve point effects,adapts to environmental constraints,optimizes costs while considering prohibited operating zones,minimizes active power losses,and optimizes voltage deviation by enhancing the voltage stability index(VsI)*** research significantly contributes to advancing OPF,emphasizing GBBLCO’s improved global search capabilities and ability to address challenges related to local *** emerges as a versatile and robust optimization tool for diverse challenges in power systems,offering a promising solution for the evolving needs of renewable energy-integrated power grids.

关键词： Renewable energy integration optimal power flow stochastic renewable energy sources gaussian-bare-bones levy cheetah optimizer electrical network optimization carbon tax optimization