检索结果-南通市图书馆

On the Time Fractional Modulation for Electron Acoustic Shock Waves

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2017年第3期34卷 86-89页

作者： H.G.Abdelwahed E.K.El-Shewy a.a.mahmoud College of Science and Humanity Studies Al-Kharj Department of PhysicsPrince Sattam Bin Abdulaziz University Theoretical Physics Group Department of PhysicsFaculty of ScienceMansoura University

Nonlinear features of electron-acoustic shock waves are studied. The Burgers equation is derived and converted to the time fractional Burgers equation by Agrawal＇s method. Using the Adomian decomposition method, the shock wave solutions of the time fractional Burgers equation are constructed. The effect of time fractional parameter on the shock wave properties in auroral plasma ＆ investigated.

关键词： On the Time Fractional Modulation for Electron Acoustic Shock Waves

Group solution for an unsteady non-Newtonian Hiemenz flow with variable fluid properties and suction/injection

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2014年第9期23卷 43-53页

作者： H.M.El-Hawary Mostafa a.a.mahmoud Reda G.Abdel-Rahman Abeer S.Elfeshawey Department of Mathematics Faculty of ScienceAssuit University Department of Mathematics Faculty of ScienceBenha University

The theoretic transformation group approach is applied to address the problem of unsteady boundary layer flow of a non-Newtonian fluid near a stagnation point with variable viscosity and thermal conductivity. The application of a two- parameter group method reduces the number of independent variables by two, and consequently the governing partial differential equations with the boundary conditions transformed into a system of ordinary differential equations with the appropriate corresponding conditions. Two systems of ordinary differential equations have been solved numerically using a fourth-order Runge-Kutta algorithm with a shooting technique. The effects of various parameters governing the problem are investigated.

关键词： non-Newtonian fluid stagnation point two-parameter group method variable viscosity

Investigating the effect of extraction procedure on the anti-inflammatory metabolites of olibanum resin from different Boswellia species through LC-MS/MS-based metabolomics

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Food Bioscience 2023年第3期53卷 1665-1677页

作者： Hanaa M.M.Elhaddad Hala M.Hammoda Doaa A.Ghareeb Fatma a.a.mahmoud Ahmed Hussein Mokhtar Ibrahim Yousef Reham S.Darwish Eman Shawky Department of Pharmacognosy Faculty of PharmacyAlexandria UniversityEgypt Bio-screening and Preclinical Trial Lab Biochemistry DepartmentFaculty of ScienceAlexandria UniversityAlexandriaEgypt Biochemistry Department Faculty of ScienceAlexandria UniversityAlexandriaEgypt Department of Biotechnology Institute of Graduate Studies and ResearchAlexandriaEgypt Department of Environmental Studies Institute of Graduate Studies and ResearchAlexandriaEgypt

Olibanum is a resinous extract extracted from several species of Boswellia *** works aims to contribute to the research on the chemistry and anti-inflammatory activity of raw,acidic and neutral fractions of different olibanum species to determine the effects of different extraction procedures on the composition of anti-inflammatory *** profiling of different fractions of Boswellia species was attempted using UPLC/MS/MS coupled to chemometric *** anti-inflammatory activity of the tested extracts was assessed on LPS-stimulated WBCs through four pro-inflammatory cytokines(TNF-α,IL-6,IL-1βand IFN-γ)in addition to reveal the efficacy-directed markers using multivariate ***/MS/MS analysis led to the annotation of 77 compounds belonging to several chemical *** models indicated that samples segregation was based on the geographical source of the oleo-gum-resin rather than extraction *** and neutral extracts of *** and *** alcoholic extract were strongly correlated to inhibition of the pro-inflammatory markers IL-1βand TNF-αwhile there was a strong correlation between the raw extract of *** and the alcoholic extract of *** activity to IFN-γ***,the most active extracts against IL-6 were the acidic and raw extracts of *** and ***.

关键词： Frankincense Extraction Anti-inflammatory Metabolomics UPLC/MS/MS

Multi-Stage-Based Siamese Neural Network for Seal Image Recognition

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 2025年第1期142卷 405-423页

作者： Jianfeng Lu Xiangye Huang Caijin Li Renlin Xin Shanqing Zhang mahmoud Emam School of Computer Science and Technology Hangzhou Dianzi UniversityHangzhou310018China Shangyu Institute of Science and Engineering Hangzhou Dianzi UniversityShaoxing312300China Faculty of Artificial Intelligence Menoufia UniversityShebin El-Koom32511Egypt

Seal authentication is an important task for verifying the authenticity of stamped seals used in various domains to protect legal documents from tampering and *** seal inspection is commonly audited manually to ensure document ***,manual assessment of seal images is tedious and laborintensive due to human errors,inconsistent placement,and completeness of the *** image recognition systems are inadequate enough to identify seal types accurately,necessitating a neural network-based method for seal image ***,neural network-based classification algorithms,such as Residual Networks(ResNet)andVisualGeometryGroup with 16 layers(VGG16)yield suboptimal recognition rates on stamp ***,the fixed training data categories make handling new categories to be a challenging *** paper proposes amulti-stage seal recognition algorithmbased on Siamese network to overcome these ***,the seal image is pre-processed by applying an image rotation correction module based on Histogram of Oriented Gradients(HOG).Secondly,the similarity between input seal image pairs is measured by utilizing a similarity comparison module based on the Siamese ***,we compare the results with the pre-stored standard seal template images in the database to obtain the seal *** evaluate the performance of the proposed method,we further create a new seal image dataset that contains two subsets with 210,000 valid labeled pairs in *** proposed work has a practical significance in industries where automatic seal authentication is essential as in legal,financial,and governmental sectors,where automatic seal recognition can enhance document security and streamline validation ***,the experimental results show that the proposed multi-stage method for seal image recognition outperforms state-of-the-art methods on the two established datasets.

关键词： Seal recognition seal authentication document tampering siamese network spatial transformer network similarity comparison network

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

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

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

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

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

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

Spider Monkey Optimization with Statistical Analysis for Robust Rainfall Prediction

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

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

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

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

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

Targeting host factors:A novel rationale for the management of hepatitis C virus

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2009年第28期15卷 3472-3479页

作者： mahmoud Aboelneen Khattab Department of Internal Medicine El-Minia University

Hepatitis C is recognized as a major threat to global public health. The current treatment of patients with chronic hepatitis C is the addition of ribavirin to interferon-based therapy which has limited efficacy, poor tolerability, and significant expense. New treatment options that are more potent and less toxic are much needed. Moreover, more effective treatment is an urgent priority for those who relapse or do not respond to current regimens. A major obstacle in combating hepatitis C virus （HCV） infection is that the fidelity of the viral replication machinery is notoriously low, thus enabling the virus to quickly develop mutations that resist compounds targeting viral enzymes. Therefore, an approach targeting the host cofactors, which are indispensable for the propagation of viruses, may be an ideal target for the development of antiviral agents because they have a lower rate of mutation than that of the viral genome, as long as they have no side effects to patients. Drugs targeting, for example, receptors of viral entry, host metabolism or nuclear receptors, which are factors required to complete the HCV life cycle, may be more effective in combating the viral infection. Targeting host cofactors of the HCV life cycle is an attractive concept because it imposes a higher genetic barrier for resistance than direct antiviral compounds. However the principle drawback of this strategy is the greater potential for cellular toxicity.

关键词： Host factors Hepatitis C virus Noveltreatment Cell entry Host metabolism Nuclearreceptors Insulin resistance