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Transpressive Structures in the Ghadir Shear Belt, Eastern Desert, Egypt: Evidence for Partitioning of Oblique Convergence in the Arabian-Nubian Shield during Gondwana Agglutination

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Acta Geologica Sinica(English Edition) 2019年第6期93卷 1614-1646页

作者： Mohamed ABD EL-WAHED Samir KAMH mahmoud ashmawy Aly SHEBL Geology Department Faculty of Science Tanta University

Transpressional deformation has played an important role in the late Neoproterozoic evolution of the ArabianNubian Shield including the Central Eastern Desert of *** Ghadir Shear Belt is a 35 km-long,NW-oriented brittleductile shear zone that underwent overall sinistral transpression during the Late *** this shear belt,strain is highly partitioned into shortening,oblique,extensional and strike-slip structures at multiple ***,strain partitioning is heterogeneous along-strike giving rise to three distinct structural *** the East Ghadir and Ambaut shear belts,the strain is pure-shear dominated whereas the narrow sectors parallel to the shear walls in the West Ghadir Shear Zone are simple-shear *** domains are comparable to splay-dominated and thrust-dominated strike-slip shear *** kinematic transition along the Ghadir shear belt is consistent with separate strike-slip and thrustsense shear *** earlier fabric(S1),is locally recognized in low strain areas and SW-ward thrusts.S2 is associated with a shallowly plunging stretching lineation(L2),and defines^NW-SE major upright macroscopic folds in the East Ghadir shear belt.F2 folds are superimposed by^NNW–SSE tight-minor and major F3 folds that are kinematically compatible with sinistral transpressional deformation along the West Ghadir Shear Zone and may represent strain partitioning during deformation.F2 and F3 folds are superimposed by ENE–WSW gentle F4 folds in the Ambaut shear *** sub-parallelism of F3 and F4 fold axes with the shear zones may have resulted from strain partitioning associated with simple shear deformation along narrow mylonite zones and pure shear-dominant deformation in fold *** ENEstriking shear zones were subsequently active at ca.595 Ma,coeval with sinistral shearing along NW-to NNW-striking shear *** occurrence of upright folds and folds with vertical axes suggests that transpression plays a significant role in

关键词： Arabian-Nubian Shield Ghadir shear belt transpression splay-dominated and thrust-dominated strike-slip shear zones Egypt

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Exact solution for the unsteady flow of a semi-infinite micropolar fluid

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Acta Mechanica Sinica 2011年第3期27卷 354-359页

作者： H.H. Sherief M.S. Faltas E.A. ashmawy Department of Mathematics Faculty of ScienceAlexandria University

The unsteady motion of an incompressible micropolar fluid filling a half-space bounded by a horizontal infinite plate that started to move suddenly is considered. Laplace transform techniques are used. The solution in the Laplace transform domain is obtained by using a direct approach. The inverse Laplace transforms are obtained in an exact manner using the complex inversion formula of the transform together with contour integration techniques. The solution in the case of classical viscous fluids is recovered as a special case of this work when the micropolarity coecient is assumed to be zero. Numerical computations are carried out and represented graphically.

关键词： Unsteady motion . Laplace transform . Microp-olar fluid

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Fundamental solutions for axi-symmetric translational motionof a microstretch fluid

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Acta Mechanica Sinica 2012年第3期28卷 605-611页

作者： H.H.Sherief M.S.Faltas E.A.ashmawy Department of Mathematics Faculty of ScienceAlexandria University

The fundamental solution for the axi-symmetric translational motion of a microstretch fluid due to a concen- trated point body force is obtained. A general formula for the drag force exerted by the fluid on an axi-symmetric rigid par- ticle translating in it is then deduced. As an application to the obtained drag formula, this paper has discussed the problem of creeping translational motion of a rigid sphere in a mi- crostretch fluid. The slip boundary condition on the surface of the spherical particle is applied. The drag force and the other physical quantities are obtained and represented graph- ically for various values of the micropolarity and slip param- eters.

关键词： Drag force Fundamental solution Mi-crostretch fluid Slip condition

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Development of AZ91/SiC surface composite by FSP:effect of vibration and process parameters on microstructure and mechanical characteristics

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Advances in Manufacturing 2020年第1期8卷 82-96页

作者： Behrouz Bagheri mahmoud Abbasi Department of Mining and Metallurgy Amirkabir University of TechnologyTehranIran Faculty of Engineering University of Kashan.KashanIran

A surface composite layer enhances the mechanical characteristics of a surface while retaining the properties of the base *** stir processing(FSP)is a method for forming surface metal matrix composites(SMMCs)that reinforce a surface with *** the current study,a new method entitled friction stir vibration processing(FSVP)was applied to form SMMCs on the surface of AZ91 magnesium alloy with SiC particles as the reinforcing *** to FSP,in FSVP,the workpiece was vibrated normal to the processing line while the tool rotated and *** microstructure and mechanical properties of friction stir(FS)and friction stir vibration(FSV)processed specimens were ***,the effects of vibration frequency and process parameters on different characteristics of FS and FSV processed specimens were *** results showed that the stir zone grains for FSV processed specimens were finer than those for FS processed specimens,and the second phase particles(SiC particles)had a more homogenous distribution in the former specimens than in the latter *** was related to the effect of workpiece vibration during FSVP,which increased the material deformation and led to enhanced dynamic recrystallization and the breakdown of agglomerated SiC *** results indicated that the stir zone grain size decreased,and the distribution homogeneity of the SiC particles increased as vibration frequency *** was also observed that the stir zone grain size increased,and the mechanical properties of the processed specimens decreased as tool rotation speed increased.

关键词： Friction stir processing(FSP) Vibration AZ91 magnesium alloy Dynamic recrystallization Microstructure Mechanical properties

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Unveiling the complexities of microbiologically induced corrosion:mechanisms,detection techniques,and mitigation strategies

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Frontiers of Environmental Science & Engineering 2024年第10期18卷 15-48页

作者： mahmoud A.Ahmed Safwat A.mahmoud Ashraf A.Mohamed Veolia Water Technologies Cairo 11835Egypt Chemistry department Faculty of ScienceAin Shams UniversityCairo 11566Egypt Physics Department Faculty of ScienceNorthern Border UniversityArar 13211Saudi Arabia

Microbiologically induced corrosion(MIC)is a complex and destructive phenomenon that occurs in various sectors,involving the interaction between microorganisms and metal surfaces,resulting in accelerated corrosion *** review article provides a comprehensive analysis of MIC,encompassing microbial species involved,their metabolic activities,and influential environmental factors driving the corrosion *** mechanisms of MIC,both in the presence and absence of oxygen,are explored,along with the diverse effects of microbes on different types of corrosion and their economic *** and monitoring techniques,including traditional and advanced methods such as microbiological and electrochemical methods,are ***,it examines preventive and control measures,such as the use of biocides and their mechanisms of *** to enhance the performance of these control measures and the effectiveness of antimicrobial agents during disinfection processes,including surfactants and chelators,are ***,the review highlights enzymatic remediation as a sustainable alternative approach,providing detailed *** challenges in mitigating MIC and potential future developments and collaborative opportunities are also *** systematic review is a valuable resource for researchers,industry professionals,and policymakers seeking a comprehensive understanding of the complex phenomenon of MIC and effective strategies for its management.

关键词： Metal failure Biofilm formation Enzymatic remediation Antimicrobial agents Bio-corrosion mechanisms

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Spider Monkey Optimization with Statistical Analysis for Robust Rainfall Prediction

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Computers, Materials & Continua 2022年第8期72卷 4143-4155页

作者： mahmoud Ragab Information Technology Department Faculty of Computing and Information TechnologyKing Abdulaziz UniversityJeddah 21589Saudi Arabia Centre of Artificial Intelligence for Precision Medicines King Abdulaziz UniversityJeddah 21589Saudi Arabia Mathematics Department Faculty of ScienceAl-Azhar UniversityNaser City 11884CairoEgypt

Rainfall prediction becomes popular in real time environment due to the developments of recent *** and fast rainfall predictive models can be designed by the use of machine learning(ML),statistical models,***,feature selection approaches can be derived for eliminating the curse of dimensionality *** this aspect,this paper presents a novel chaotic spider money optimization with optimal kernel ridge regression(CSMO-OKRR)model for accurate rainfall *** goal of the CSMO-OKRR technique is to properly predict the rainfall using the weather *** proposed CSMO-OKRR technique encompasses three major processes namely feature selection,prediction,and parameter ***,the CSMO algorithm is employed to derive a useful subset of features and reduce the computational *** addition,the KRR model is used for the prediction of rainfall based on weather ***,the symbiotic organism search(SOS)algorithm is employed to properly tune the parameters involved in it.A series of simulations are performed to demonstrate the better performance of the CSMO-OKRR technique with respect to different *** simulation results reported the enhanced outcomes of the CSMO-OKRR technique with existing techniques.

关键词： Rainfall prediction statistical techniques machine learning kernel ridge regression symbiotic organism search parameter tuning

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A machine vision-intelligent modelling based technique for in-line bell pepper sorting

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Information Processing in Agriculture 2023年第4期10卷 491-503页

作者： Khaled Mohi-Alden mahmoud Omid mahmoud Soltani Firouz Amin Nasiri Department of Agricultural Machinery Engineering Faculty of Agricultural Engineering and TechnologyUniversity of TehranIran Department of Biosystems Engineering and Soil Science University of TennesseeKnoxvilleTN 37996USA

The uniformity of appearance attributes of bell peppers is significant for consumers and food *** automate the sorting process of bell peppers and improve the packaging quality of this crop by detecting and separating the not likable low-color bell peppers,developing an appropriate sorting system would be of high importance and *** to standards and export needs,the bell pepper should be graded based on maturity levels and size to five *** research has been aimed to develop a machine vision-based system equipped with an intelligent modelling approach for in-line sorting bell peppers into desirable and undesirable samples,with the ability to predict the maturity level and the size of the desirable bell *** perceptron(MLP)artificial neural networks(ANNs)as the nonlinear modelswere designed for that *** modelswere trained and evaluated through five-fold cross-validation *** optimum MLP classifier was compared with a linear discriminant analysis(LDA)*** results showed that the MLP outperforms the LDA *** processing time to classify each captured image was estimated as 0.2 s/sample,which is fast enough for in-line ***,the optimum MLP model was integrated with a machine vision-based sorting machine,and the developed system was evaluated in the in-line *** performance parameters,including accuracy,precision,sensitivity,and specificity,were 93.2%,86.4%,84%,and 95.7%,*** total sorting rate of the bell pepper was also measured as approximately 3000 samples/h.

关键词： Bell pepper Sorting Image processing Machine vision Multilayer perceptron Linear discriminant analysis

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Developing a GIS-based rough fuzzy set granulation model to handle spatial uncertainty for hydrocarbon structure classification,case study:Fars domain,Iran

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Geo-Spatial Information Science 2022年第3期25卷 399-412页

作者： Sahand Seraj mahmoud Reza Delavar School of Surveying and Geospatial Engineering University of TehranTehranIran Center of Excellence in Geomatics Engineering in Disaster Management University of TehranTehranIran

It is well agreed that geologic risk occurs during hydrocarbon exploration because diverse uncertainties accompany the entire hydrocarbon system parameters such as the source rock,reservoir rock,trap and seal *** order to overcome such attributes with uncertainties,a number of soft computing methods are *** granules could be provided by the Rough Fuzzy Set Granulation(RFSG)with a thorough quality *** is capable of attribute reduction that has been claimed to be essential in investigating the hydrocarbon *** paper is an endeavor to recommend a Geospatial Information System(GIS)-based model with the aim of categorizing the hydrocarbon structures map consistent with the uncertainty range concepts of geologic risk in the rough fuzzy sets and granular *** model used the RFSG for the attribute reduction by a Decision Logic language(DLlanguage).The RFSG was employed in order to classify hydrocarbon structures according to geological risk and extract the fuzzy rules with a predefined range of *** order to assess the precisions of the fuzzy decisions on the hydrocarbon structure classification,the fuzzy entropy and fuzzy cross-entropy are *** proposed RFSG model applied for 62 structures as the training data,average fuzzy entropy has been calculated as 0.85,whereas the average fuzzy cross-entropy has been calculated *** it can be discerned,just seven structures had cross-entropies greater than 0.1,while three structures were larger than *** is implied that the precision of the proposed model is about 89%.The results yielded two reductions for the condition attributes and 11 fuzzy rules being filtered by the granular computing values.

关键词： Rough fuzzy set granular computing Geospatial Information Science(GIS) petroleum system hydrocarbon structure

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Theoretical work on magnetocaloric effect in La_(0.75)Ca_(0.25)MnO_(3)

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Journal of Advanced Ceramics 2012年第4期1卷 290-295页

作者： mahmoud Aly HAMAD Physics Department College of ScienceAl-Jouf UniversityAl-JoufSkakaP.O.Box 2014Saudi Arabia

In this work,a phenomenological model is applied to describe the magnetocaloric effect for the La_(0.75)Ca_(0.25)MnO_(3)system near a second-order phase transition from a ferromagnetic to a paramagnetic *** on this model,it can predict the values of the magnetocaloric properties from calculation of magnetization as a function of temperature under different external magnetic *** magnetic entropy change reaches a peak of about 5.39 J/(kg·K)at 257 K upon 4 T applied field ***ΔSM distribution is much more uniform than that of gadolinium,which is desirable for an Ericson-cycle magnetic refrigerator.

关键词： magnetocaloric effect model magnetic entropy change heat capacity change relative cooling power

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Bearing capacity of circular footings on multi-layered sand-waste tire shreds reinforced with geogrids

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第3期16卷 1085-1094页

作者： mahmoud Ghazavi Ehsan Khosroshahi Faculty of Civil Engineering K.N.Toosi University of TechnologyTehranIran

The presence of waste tires poses an environmental challenge as they occupy a significant amount of land and are expensive to dispose in ***,reusing waste tires can address this issue when waste tires are used in geotechnical *** determine the viability of this approach,laboratoryscale tests were conducted to investigate load-bearing capacity of circular footings on sand-tire shred(STS)mixtures with shredded waste tire contents of 5%e15%by weight and three different widths of *** investigation focused on analyzing the thickness of layers composed of STS mixtures,the soil cap,and the impact of geogrids on bearing *** results indicate that a specific mixture of sand and tire shreds provides the highest footing-bearing *** addition,the optimal shred content and size were found to be 10%by weight and 2 cm×10 cm,***,for a given tire shred width,a particular length provides the largest bearing *** results agree well with that of previous research conducted by the first author and his colleagues in direct shear and California bearing ratio(CBR)*** primary finding of this research is that the use of two-layered STS mixtures reinforced by geogrids significantly enhances the bearing capacity.

关键词： Geogrid Sand Waste tire shred Bearing capacity Waste tire shred optimization Tire shred aspect ratio

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