检索结果-南通市图书馆

On the Communication Requirements for the Smart Grid

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Energy and Power Engineering 2011年第1期3卷 53-60页

作者： Mohamed daoud Xavier Fernando 不详

The current power grid is facing many challenges that it was not designed or engineered to handle which range from congestions and major blackouts to the overwhelming increase in demand and security concerns. The current electric grid was established before the 1960’s. It is believed that the electric grid is the most complex and gigantic machine ever made in human history;it consists of wires, cables, towers, transformers and circuit breakers installed together in outdated manner. During the 60’s, computers and sensors were used to monitor and slightly control the grid;however, fifty years later these sensors are considered less than ideal. Presented here is a review of the smart grid communication network in terms of configuration, bandwidth and latency requirements as well as the technology used. We simulate the access layer of the smart grid net-work and show that no single available communication technology can be used for all layers of the smart grid;thus, different technologies for different layers are needed. A new protocol for optimizing the smart grid is recommended.

关键词： Smart Grid Core Network Distribution Network Access Network Energy Latency Bandwidth

Ground state parameters,electronic properties and elastic constants of CaMg3:DFT study

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Magnesium and Alloys 2020年第4期8卷 1166-1175页

作者： H.Rekab-Djabri Manal M.Abdus Salam S.daoud M.Drief Y.Guermit S.Louhibi-Fasla Laboratory of Micro and Nanophysics(LaMiN) National Polytechnic School OranENPO-MABP 1523El M'Naouer31000 OranAlgeria Faculty of Nature and Life Sciences and Earth Sciences Akli Mohand-Oulhadj University10000 BouiraAlgeria Department of Applied Physics Tafila Technical UniversityTafila 66110Jordan Laboratory of Materials and Electronic Systems Mohamed El Bachir El Ibrahimi University of Bordj Bou ArreridjBordj BouArreridj 34000Algeria Laboratoire des Materiaux Magnetiques Departement de PhysiqueFaculte des SciencesUniversite Djilali LIABES de Sidi-Bel-AhbesSidi Bel Abbes 22000Algeria

The present study aims to investigate the equation of state(EOS)parameters of CaMg3 in aReCh(D09),AIFR(DO3),CU3A11(LI2)and CuTi3(L60)structures,using full potential linear muffin-tin orbitals(FP-LMTO)approach based on the density functional theory(DFT).The local density approximation(LDA)and the generalized gradient approximation(GGA)were both applied for the exchange-correlation potential *** calculated equation of slate parameters at equilibrium,in general,agreed well with the available data of the *** calculations showed that under compression CaMg3 transforms from DO3 to DO9 at about 29.96GPa,and 25.1 GPa using LDA and GGA,*** elastic constants C,y,aggregate moduli,Vickers hardness,sound velocity,and Debye temperature of CaMg3 in D03 structure were also reported,discussed and *** LDA(GGA),the calculated values of Hv andθD were found at around 5.80GPa(5.93GPa)and 393.44 K(389.91 K),*** band structure,total density of states(TDOS)as well as the partial density of states(PDOS)have been also *** electronic band structure confirms the metallic behavior of CaMg3 in DO3 phase,the valence bands are dominated by the maximum contribution of‘d’like states of Ca in the energy ranging from 2 to 3 eV for GGA,and from 4.5 to 5 eV for LDA,respectively.

关键词： CaMg3 compound Electronic properties Phase transition Elastic constants FP-LMTO

Equivalence Problems in Translation

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

Sino-US English Teaching 2017年第2期14卷 86-97页

作者： Nansy Ahmad daoud Mosleh Alfaori Translation Department Yarmouk University Irbid Jordan

Equivalence is an important notion in translation theory. Therefore, theorists in the field of translation studies are interested in studying and examining this notion in order to discover its effect on the way a translator deals with a text. The aim of this study is to explore the different definitions of translation as a process and as a product. The study focuses on specific definitions that have been introduced by Arab scholars in the field of translation, for example, AI-zarqani （1998） who argued that translation is an act of transferring a text with all its meanings and objectives from one language to another. This idea of transferring the different meanings and objectives of a given text imposes an important question that the researcher tries to answer in this paper. Is translation a process of substituting a text in one language for a text in another？ After reviewing the related literature and by analyzing different translated passages from Arabic and English, it shows that translation is not a mere substitution of texts among languages. The translator must be aware of the objectives and meanings conveyed in the source text in order to produce an accurate translation.

关键词： translation equivalence translation objectives substitution

Enhancing the Odd Peaks Detection in OFDM Systems Using Wavelet Transforms

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Communications, Network and System Sciences 2016年第7期9卷 295-303页

作者： Ahlam Damati Omar daoud Qadri Hamarsheh Department of Electrical Engineering Philadelphia University Amman Jordan Department of Communications and Electronics Engineering Philadelphia University Amman Jordan Department of Computer Engineering Philadelphia University Amman Jordan

This work aims to study the effect of unwanted peaks and enhance the performance of wireless systems on the basis of tackling such peaks. A new proposition has been made based on wavelet transform method and its entropy. Signals with large peak-to-average power ratio (PAPR) will be examined such as the ones that are considered as the major Orthogonal Frequency Division Multiplexing (OFDM) systems drawbacks. Furthermore, aspatial diversity Multiple-Input Multiple- Out-put (MIMO) technology is used to overcome the complexity addition that could arise in our proposition. To draw the best performance of this work, a MATLAB simulation has been used;it is divided into three main stages, namely, MIMO-OFDM symbols’ reconstruction based on wavelet transform, a predetermined thresholding formula, and finally, moving filter. This algorithm is called Peaks’ detection based Entropy Wavelet Transform;PD-EWT. Based on the simulation, and under some constrains such as the bandwidth occupancy and the complexity structure of the transceivers, a peak detection ratio has been achieved and reaches around 0.85. Comparing with our previously published works, the PD-EWT enhances detection ratio for 0.25 more peaks.

关键词： Wavelet Transform Entropy MIMO OFDM PAPR

Herbal extracts counteract cisplatin-mediated cell death in rat testis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian Journal of Andrology 2008年第2期10卷 291-297页

作者： Amr Amin Alaaeldin A. Hamza Amr Kambal Sayel daoud Biology Department United Arab Emirates University AI-Ain 17551 United Arab Emirates Hematology Laboratory Twain Hospital At-Ain 15258 United Arab Emirates Histopathology Laboratory Twain Hospital At-Ain 15258 United Arab Emirates

Aim： To evaluate the protective effects of ginger （Gin） and roselle （Ros） against testicular damage and oxidative stress in a cisplatin （CIS）-induced rodent model. Their protective effects against CIS-induced apoptosis in testicular and epididymal sperms is also investigated. Methods： Ethanol extracts of Gin or Ros （1 g/***） were given orally to male albino rats for 26 days. This period began 21 days before a single CIS intraperitoneal injection （10 mg/kg body weight）. Results： Gin or Ros given orally significantly restored reproductive function. Both tested extracts notably reduced the CIS-induced reproductive toxicity, as evidenced by restoring the testis normal morphology. In Gin and Ros, the attenuation of CIS-induced damage was associated with less apoptotic cell death both in the testicular tissue and in the sperms. CIS-induced alterations of testicular lipid peroxidation were markedly improved by these plant extracts. Conclusion： The present results provide further insights into the mechanisms of protection against CIS-induced reproductive toxicity and confirm the essential anti-oxidant potential of both examined extracts. （Asian J Androl 2008 Mar; 10： 291-297）

关键词： cisplatin cell death toxicity flow cytometry ginger roselle

Theoretical Investigation of the Effect of the Surface Parameters on Cathodoluminescence Signal

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

材料科学与工程（中英文版） 2011年第4期5卷 473-477页

作者： Kenieche daoud Guergouri Kamel Department of Physics Faculty of Sciences University M＇hamed Bouguerra Avenue de I＇independance 35000 BoumerdbsAlgeria Laboratory of Physics-Chemistry of Semiconductors Department of Physics University Menouri Constantine 25000 Algeria

Joint Channel and Multi-User Detection Empowered with Machine Learning

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1期70卷 109-121页

作者： Mohammad Sh.daoud Areej Fatima Waseem Ahmad Khan Muhammad Adnan Khan Sagheer Abbas Baha Ihnaini Munir Ahmad Muhammad Sheraz Javeid Shabib Aftab College of Engineering Al Ain UniversityAbu Dhabi112612UAE Department of Computer Science Lahore Garrison UniversityLahore54792Pakistan School of Computer Science National College of Business Administration and EconomicsLahore54000Pakistan Riphah School of Computing and Innovation Faculty of ComputingRiphah International UniversityLahore54000Pakistan Pattern Recognition and Machine Learning Lab Department of Software EngineeringGachon UniversitySeongnam13557South Korea Department of Computer Science College of Science and TechnologyWenzhou Kean University325060USA Department of Computer Science Hameeda Rasheed Institute of Science and TechnologyMultan66000Pakistan

The numbers of multimedia applications and their users increase with each passing *** multi-carrier systems have been developed along with varying techniques of space-time coding to address the demand of the future generation of network *** this article,a fuzzy logic empowered adaptive backpropagation neural network(FLeABPNN)algorithm is proposed for joint channel and multi-user detection(CMD).FLeABPNN has two *** first stage estimates the channel parameters,and the second performsmulti-user *** proposed approach capitalizes on a neuro-fuzzy hybrid systemthat combines the competencies of both fuzzy logic and neural *** study analyzes the results of using FLeABPNN based on a multiple-input andmultiple-output(MIMO)receiver with conventional partial oppositemutant particle swarmoptimization(POMPSO),total-OMPSO(TOMPSO),fuzzy logic empowered POMPSO(FL-POMPSO),and FL-TOMPSO-based MIMO *** FLeABPNN-based receiver renders better results than other techniques in terms of minimum mean square error,minimum mean channel error,and bit error rate.

关键词： Channel and multi-user detection minimum mean square error multiple-input and multiple-output minimum mean channel error bit error rate

System Reliability Evaluation for Imperfect Networks Using Polygon-to-Chain Reduction

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

American Journal of Operations Research 2017年第3期7卷 201-224页

作者： Mohamed-Larbi Rebaiaia daoud Ait-Kadi Department of Mechanical Engineering/Interuniversity Research Center on Enterprise Networks Logistics and Transportation Laval University Quebec Canada

The purpose of this paper is to propose a computational technique for evaluating the reliability of networks subject to stochastic failures. In this computation, a mathematical model is provided using a technique which incorporates the effect of the factoring decomposition theorem using polygon-to-chain and series-parallel reductions. The algorithm proceeds by identifying iteratively one of seven polygons and when it is discovered, the polygon is immediately removed and replaced by a simple chain after having changed the individual values of the reliability of each edge and each node of the polygon. Theoretically, the mathematical development follows the results presented by Satyanarayana & Wood and Theologou & Carlier. The computation process is recursively performed and less constrained in term of execution time and memory space, and generates an exact value of the reliability.

关键词： Reliability Networks Algorithms Factorization Polygon-to-Chain Reduction Decomposition

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Synovial Joint Study

American Journal of Computational Mathematics 2022年第1期12卷 7-24页

作者： Nawal Odah Al-Atawi daoud Suleiman Mashat Department of Mathematics Numerical Analysis King Abdulaziz University Jeddah KSA

The impact of certain separate characteristics, including the porosity parameter, reaction rate parameter, and viscoelastic parameters of steady convective diffusion across a rectangular channel, has been investigated in this article. The model’s momentum and concentration equations were developed using the similarities technique, and the numerically finite volume method was combined with the Beavers and Joseph slip conditions. Various graphs have been used to get insight into various parameters of the problem on velocity and concentration. The cartilage surfaces are assumed to be porous, and the viscosity of synovial fluid varies with hyaluronate (HA) content.

关键词： Lubrication Theory Rheology of Synovial Fluid Velocity & Concentra-tion Similarity Parameters Finite Volume Method