检索结果-南通市图书馆

Microstructure of coupled Al/gray cast iron obtained by molding and its effect on mass loss

在线全文

学校读者我要写书评

暂无评论

China Foundry 2018年第5期15卷 378-383页

作者： Mohamed Bouitna Naima Boutarek-Zaourar samir Mansour samir Mourad Chentouf eric Mossang Laboratory of Materials Technology Faculty of Mechanical Engineering and Process EngineeringUniversity of Science and Technology Houari BoumedieneB.P.32 El Alia16111 AlgiersAlgeria Department of Mechanical engineering School of Technology Superior1100 Notre-Dame Street WestMontrealQuebec H3C 1K3Canada NeeI Institute National Center for Scientific Research25rue des MartyrsBO 16638042Grenoble CedexFrance

This study aims to consolidate the surface of gray cast iron with aluminum deposition by developing a method that combines the preparation and surface treatment in a single operation. The effect of the wall thickness of the castings on the microstructure of the formed layers was studied, and two thicknesses, 8 mm and 25 mm, were studied. The formation of a continuous and homogeneous rich aluminum layer on the surface of the cast iron was observed. The formed layer is composed of two successive zones identified as two proeutectoid phases FeAl+FeAl/FeAl2 and single-phase FeAl, which significantly increases the surface hardness. Furthermore, this change in surface composition makes it possible to reduce the mass of the immersed samples in a 1 M hydrochloric acid solution during different exposure times(1 to 4 days). Consequently, a clear improvement in the corrosion resistance of the treated layers is highlighted.

关键词： gray cast iron aluminum coating treatment in the mold mass loss

existence Results for a Class of Periodic evolution Variational Inequalities

在线全文

学校读者我要写书评

暂无评论

Chinese Annals of Mathematics,Series B 2007年第6期28卷 629-650页

作者： samir ADLY Daniel GOeLeVeN Michel THRA DMI-XLIM UMR-CNRS 6172Université de Limoges123 Avenue A.Thomas87060 Limoges CedexFrance. IReMIA Université de La Réunion97400 Saint-DenisFrance.

In this paper, using the Brouwer topological degree, the authors prove an existence result for finite variational inequalities. This approach is also used to obtain the existence of periodic solutions for a class of e... 详细信息

关键词： Variational inequalities Differential inclusions Topological degree Guiding functions Periodic solutions

Periodic Solutions of evolution Variational Inequalities—a Method of Guiding Functions

在线全文

学校读者我要写书评

暂无评论

Chinese Annals of Mathematics,Series B 2009年第3期30卷 261-272页

作者： samir ADLY Daniel GOeLeVeN Michel THRA Département de Math'ematiques et Informatique Laboratoire XLIM(Unité Mixte 6172 du CNRS)Université de Limoges123 Avenue A.Thomas87060 Limoges CedexFrance. Laboratoire d' Informatique et de Mathématiques Université de La Réunion97400 Saint-DenisFrance.

This paper focuses on a part of the presentation given by the third author at the Shanghai Forum on Industrial and Applied Mathematics(Shanghai 2006).It is related to the existence of a periodic solution of evolution ... 详细信息

关键词： Variational inequality Differential inclusion Topological degree Guiding function Periodic solution

A New Action-Based Reasoning Approach for Playing Chess

在线全文

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2021年第10期69卷 175-190页

作者： Norhan Hesham Osama Abu-elnasr samir elmougy Faculty of Computers and Information Department of Computer ScienceMansoura University35516Egypt

Many previous research studies have demonstrated game strategies enabling virtual players to play and take actions mimicking *** CaseBased Reasoning(CBR)strategy tries to simulate human thinking regarding solving problems based on constructed *** paper suggests a new Action-Based Reasoning(ABR)strategy for a chess *** strategy mimics human experts’approaches when playing chess,with the help of the CBR *** proposed engine consists of the following ***,an action library compiled by parsing many grandmasters’cases with their actions from different games is ***,this library reduces the search space by using two filtration steps based on the defined action-based and encoding-based similarity ***,the minimax search tree is fed with a list extracted from the filtering stage using the alpha-beta algorithm to prune the *** proposed evaluation function estimates the retrievably reactive ***,the best move will be selected,played on the board,and stored in the action library for future *** experiments were conducted to evaluate the performance of the proposed ***,the engine played 200 games against Rybka 2.3.2a scoring 2500,2300,2100,and 1900 rating ***,they used the Bayeselo tool to estimate these rating points of the *** results illustrated that the proposed approach achieved high rating points,reaching as high as 2483 points.

关键词： Action based reasoning case-based reasoning chess engine computer games search algorithm

Deep Learning Multimodal for Unstructured and Semi-Structured Textual Documents Classicatio

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

Computers, Materials & Continua 2021年第7期68卷 589-606页

作者： Nany Katamesh Osama Abu-elnasr samir elmougy Faculty of Computers and Information Department of Computer ScienceMansoura University35516Egypt

Due to the availability of a huge number of electronic text documents from a variety of sources representing unstructured and semi-structured information,the document classication task becomes an interesting area for controlling data *** paper presents a document classication multimodal for categorizing textual semi-structured and unstructured *** multimodal implements several individual deep learning models such as Deep Neural Networks(DNN),Recurrent Convolutional Neural Networks(RCNN)and Bidirectional-LSTM(Bi-LSTM).The Stacked ensemble based meta-model technique is used to combine the results of the individual classiers to produce better results,compared to those reached by any of the above mentioned models individually.A series of textual preprocessing steps are executed to normalize the input corpus followed by text vectorization *** techniques include using Term Frequency Inverse Term Frequency(TFIDF)or Continuous Bag of Word(CBOW)to convert text data into the corresponding suitable numeric form acceptable to be manipulated by deep learning ***,this proposed model is validated using a dataset collected from several spaces with a huge number of documents in every *** addition,the experimental results prove that the proposed model has achieved effective ***,upon investigating the PDF Documents classication,the proposed model has achieved accuracy up to 0.9045 and 0.959 for the TFIDF and CBOW features,***,concerning the JSON Documents classication,the proposed model has achieved accuracy up to 0.914 and 0.956 for the TFIDF and CBOW features,***,as for the XML Documents classication,the proposed model has achieved accuracy values up to 0.92 and 0.959 for the TFIDF and CBOW features,respectively.

关键词： Document classication deep learning text vectorization convolutional neural network bi-directional neural network stacked ensemble

A Novel Design of Octal-Valued Logic Full Adder Using Light Color State Model

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

Computers, Materials & Continua 2021年第6期67卷 3487-3503页

作者： Ahmed Talal Osama Abu-elnasr samir elmougy Department of Computer Science Faculty of Computes and InformationMansoura UniversityMansoura35516Egypt

Due to the demand of high computational speed for processing big data that requires complex data manipulations in a timely manner,the need for extending classical logic to construct new multi-valued optical models becomes a challenging and promising research *** paper establishes a novel octal-valued logic design model with new optical gates construction based on the hypothesis of Light Color State Model to provide an efficient solution to the limitations of computational processing inherent in the electronics *** provide new mathematical definitions for both of the binary OR function and the PLUS operation in multi valued logic that is used as the basis of novel construction for the optical full adder *** case studies were used to assure the validity of the proposed *** cases proved that the proposed optical 8-valued logic models provide significantly more information to be packed within a single bit and therefore the abilities of data representation and processing is increased.

关键词： Mathematical modeling numerical simulations optical logic optics in computing multi-valued logic full adder

Fractional order extremum seeking approach for maximum power point tracking of photovoltaic panels

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

Frontiers in energy 2015年第1期9卷 43-53页

作者： Ammar NeCAIBIA samir LADACI Abdelfatah CHAReF Jean Jacques LOISeAU Research Unit in Renewable energies in the Saharan Medium CDEREPST URER-MS Adrar 01000 Algeria Department ofelectrical engineering University of Skikda Skikda 21000 Algeria Department of electronics Electrotechnics and Automatics NationalPolytechnic School of Constantine Constantine 25000 Algeria SP-LabLaboratory Department of Electronics University of Constantine 1Constantine 25000 Algeria SP-Lab Laboratory Department of Electronics University of Con-stantine 1 Constantine 25000 Algeria Research Institute in Communications and Cybernetics CNRS UMR6597 1 rue de la No~ 44321 Nantes France

Due to the high interest in renewable energy and diversity of research regarding photovoltaic （PV） array, a great research effort is focusing nowadays on solar power generation and its performance improvement under various weather conditions. In this paper, an integrated framework was proposed, which achieved both maximum power point tracking （MPPT） and minimum ripple signals. The proposed control scheme was based on extremum- seeking （eS） combined with fractional order systems （FOS）. This auto-tuning strategy was developed to maximize the PV panel output power through the regulation of the voltage input to the DC/DC converter in order to lead the PV system steady-state to a stable oscillation behavior around the maximum power point （MPP）. It is shown that fractional order operators can improve the plant dynamics with respect to time response and disturbance rejection. The effectiveness of the proposed controller scheme is illustrated with simulations using measured solar radiation data.

关键词： extremum seeking (eS) fractional ordercontrol (FOC) fractional calculus photovoltaic (PV)

ANALYTICAL ANALYSIS OF INTeRFACIAL STReSSeS IN FRP-RC HYBRID BeAMS WITH TIMe-DePeNDeNT DeFORMATIONS OF RC BeAM

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Solida Sinica 2011年第6期24卷 519-526页

作者： Bouazza Fahsi Kouider Halim Benrahou Baghdad Krour Abdeloauhed Tounsi samir Benyoucef1 e Abbas Adda Bedia Laboratoire des Matériaux et Hydrologie Université de Sidi Bel Abbes BP 89 Cité Ben M'hidi 22000 SidiBel Abbes Algéri Universitaire Mustapha Stambouli Mascara Département de Génie Civil Algérie Laboratoire des Matériaux et Hydrologie Université de Sidi Bel Abbes BP 89 Cité Ben M’hidi 22000 SidiBel Abbes Algérie

In this paper, the effect of time-dependent deformations （such as shrinkage and creep） on the interracial stresses between an RC beam and FRP plate is presented. For this end, a closed-form solution for such stresses in externally FRP plated RC beams including creep and shrinkage effects is presented. The developed model is formulated to predict the interfacial stresses at time ＇t＇, in which the RC beams have been already subjected to creep and shrinkage effects. The adherend shear deformations have been included in the present theoretical analysis by assuming a parabolic shear stress through the thickness of the RC beam and the FRP panel. Contrary to some existing studies, the assumption that both RC beam and FRP panel have the same curvature is not used in the present investigation. This research is helpful for the understanding on mechanical behavior of the interface and design of the FRP-RC hybrid structures.

关键词： hybrid structure RC beams FRP composites interfacial stresses creep shrinkage

effect of driving frequency on electron heating in capacitively coupled RF argon glow discharges at low pressure

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2017年第11期26卷 329-337页

作者： Tagra samir 刘悦赵璐璐周艳文 Key Laboratory of Materials Modification by Laser Ion and Electron Beams Ministry of Education School of PhysicsDalian University of Technology School of Information Science and engineering Dalian Polytechnic University School of Materials & Metallurgy University of Science & Technology

A one-dimensional（1D） fluid model on capacitively coupled radio frequency（RF） argon glow discharge between parallel-plates electrodes at low pressure is established to test the effect of the driving frequency on electron heating. The model is solved numerically by a finite difference method. The numerical results show that the discharge process may be divided into three stages： the growing rapidly stage, the growing slowly stage, and the steady stage. In the steady stage,the maximal electron density increases as the driving frequency increases. The results show that the discharge region has three parts： the powered electrode sheath region, the bulk plasma region and the grounded electrode sheath region. In the growing rapidly stage（at 18 μs）, the results of the cycle-averaged electric field, electron temperature, electron density, and electric potentials for the driving frequencies of 3.39, 6.78, 13.56, and 27.12 MHz are compared, respectively. Furthermore,the results of cycle-averaged electron pressure cooling, electron ohmic heating, electron heating, and electron energy loss for the driving frequencies of 3.39, 6.78, 13.56, and 27.12 MHz are discussed, respectively. It is also found that the effect of the cycle-averaged electron pressure cooling on the electrons is to ＂cool＂ the electrons; the effect of the electron ohmic heating on the electrons is always to ＂heat＂ the electrons; the effect of the cycle-averaged electron ohmic heating on the electrons is stronger than the effect of the cycle-averaged electron pressure cooling on the electrons in the discharge region except in the regions near the electrodes. Therefore, the effect of the cycle-averaged electron heating on the electrons is to ＂heat＂ the electrons in the discharge region except in the regions near the electrodes. However, in the regions near the electrodes, the effect of the cycle-averaged electron heating on the electron is to ＂cool＂ the electrons. Finally, the space distributions of the electron

关键词： capacitively coupled plasmas electron heating radio frequency(RF) glow discharges driving frequency