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Doubly-fed induction generator drive based WECs using fuzzy logic controller

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Frontiers in Energy 2015年第3期9卷 272-281页

作者： Abdelhak DIDA Djilani ben ATTOUs Department of Electrical Engineering Biskra University Biskra 07000 Algeria Department of Electrical Engineering El-Oued University El Oued 39000 Algeria

The purpose of this paper is to improve the control performance of the variable speed, constant frequency doubly-fed induction generator in the wind turbine generation system by using fuzzy logic controllers. The control of the rotor-side converter is realized by stator flux oriented control, whereas the control of the grid-side converter is performed by a control strategy based on grid voltage orientation to maintain the DC-link voltage stability. An intelligent fuzzy inference system is proposed as an alternative of the conventional proportional and integral （PI） controller to overcome any disturbance, such as fast wind speed variation, short grid voltage fault, parameter variations and so on. Five fuzzy logic controllers are used in the rotor side converter （RsC） for maximum power point tracking （MPPT） algorithm, active and reactive power control loops, and another two fuzzy logic controllers for direct and quadratic rotor currents components control loops. The performances have been tested on 1.5 MW doubly-fed induction generator （DFIG） in a Matlab/simulink software environment.

关键词： fuzzy logic wind turbine vector control,doubly-fed induction generator (DFIG)

An Efficient Two-Phase Model for Computing Influential Nodes in social Networks Using social Actions

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Journal of Computer science & Technology 2018年第2期33卷 286-304页

作者： Mehdi Azaouzi Lotfi ben Romdhane Modeling of Automated Reasoning systems Research Laboratory LR17Es05 Higher Institute of Computer science and Telecom University of Sousse Sousse 526-~002 Tunisia

The measurement of influence in social networks has received a lot of attention in the data mining community. Influence maximization refers to the process of finding influential users who make the most of information or product adoption. In real settings, the influence of a user in a social network can be modeled by the set of actions （e.g., ＂like＂, ＂share＂, ＂retweet＂, ＂comment＂） performed by other users of the network on his/her publications. To the best of our knowledge, all proposed models in the literature treat these actions equally. However, it is obvious that a ＂like＂ of a publication means less influence than a ＂share＂ of the same publication. This suggests that each action has its own level of influence （or importance）. In this paper, we propose a model （called social Action-Based Influence Maximization Model, sAIM） for influence maximization in social networks. In sAIM, actions are not considered equally in measuring the ＂influence power＂ of an individual, and it is composed of two major steps. In the first step, we compute the influence power of each individual in the social network. This influence power is computed from user actions using PageRank. At the end of this step, we get a weighted social network in which each node is labeled by its influence power. In the second step of sAIM, we compute an optimal set of influential nodes using a new concept named ＂influence-BFs tree＂. Experiments conducted on large-scale real-world and synthetic social networks reveal the good performance of our model sAIM in computing, in acceptable time scales, a minimal set of influential nodes allowing the maximum spreading of information.

关键词： social network social influence social action personalized PageRank influence-BFs tree

Heterogeneous 2D/3D photonic integrated microsystems

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Microsystems & Nanoengineering 2016年第1期2卷 143-151页

作者： s.J.ben Yoo Binbin Guan Ryan P.scott Department of Electrical and Computer Engineering University of CaliforniaDavisCA 95616USA

The continuing trend of exponential growth in data communications and processing are driving the need for large-scale heterogeneous *** to the trend we have observed in electronic integrated circuit development,we are witnessing a growing trend in 3D photonic integrated circuits(PICs)development in addition to that in 2D *** are two main methods for fabricating 3D *** first method,which utilizes ultrafast laser inscription(ULI),offers freeform shaping of waveguides in arbitrary contours and *** second method,which utilizes multilayer stacking and coupling of planar PICs,exploits relatively mature 2D PIC fabrication processes applied to each layer *** the fabrication methods for 3D PICs have advantages and disadvantages such that certain applications may favor one method over the ***,a joining of 2D PICs with 3D PICs can help develop integrated microsystems with new functionalities such as non-mechanical beam steering,spacedivision multiplexing(sDM),programmable arbitrary beam shaping,and photonic signal *** discuss examples of 3D PICs and 2D/3D integrated PICs in two applications:sDM via orbital-angular-momentum(OAM)multiplexing/demultiplexing and optical beam steering using optical phased *** a 2D PIC by itself can function as an OAM multiplexer or demultiplexer,it has limitations in supporting both ***,a 3D PIC fabricated by ULI can easily support both polarizations with low propagation loss.A combination of a 3D PIC and a 2D PIC designed and fabricated for OAM applications has successfully multiplexed and demultiplexed 15 OAM states to demonstrate polarization-diversified sDM coherent optical communications using multiple OAM *** excitation of multi-ring OAM states can allow highly scalable sDM utilizing Laguerre–Gaussian modes or linearly polarized(LP)*** preliminary fabrication of multi-ring OAM multiplexers and demultiplexers using the

关键词： photonic integrated circuits three-dimensional photonics ultrafast laser inscription

Insulin like growth factor-1 increases fatty liver preservation in IGL-1 solution

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World Journal of Gastroenterology 2010年第45期16卷 5693-5700页

作者： Mohamed Amine Zaouali susagna Padrissa-Altés Ismail ben Mosbah Hassen ben Abdennebi Olivier Boillot Antoni Rimola Dalila saidane-Mosbahi Joan Roselló-Catafau Experimental Hepatic Ischemia-Reperfusion Unit Institut d'Investigacions Biomèdiques de BarcelonaConsejo Superior de Investigaciones Científicas08036 BarcelonaSpain Unitat de Transplantament de Fetgei Viabilitat del' Empelt Institut d'Investigacions Biomèdiques August Pii Sunyer08036 BarcelonaSpain Laboratory of Human Physiology Faculty of PharmacyUniversity of Monastir5000 MonastirTunisia Unit of Hepatic Transplantation Edouard Herriot Hospital69003 LyonFrance Biomedical Research Center Esther Koplowitz CIBER-ehdInstitute of Health Carlos Ⅲ08036 BarcelonaSpain

AIM: To investigate the benefits of insulin like growth factor-1 (IGF-1) supplementation to serum-free institut georges lopez-1 (IGL-1) solution to protect fatty liver against cold ischemia reperfusion injury. METHODs: steatotic livers were preserved for 24 h in IGL-1  solution supplemented with or without IGF-1 and then perfused "ex vivo " for 2 h at 37℃. We examined the effects of IGF-1 on hepatic damage and function (transaminases, percentage of sulfobromophthalein clearance in bile and vascular resistance). We also studied other factors associated with the poor tolerance of fatty livers to cold ischemia reperfusion injury such as mitochondrial damage, oxidative stress, nitric oxide, tumor necrosis factor-α (TNF-α) and mitogen-activated protein ***: steatotic livers preserved in IGL-1 solutionsupplemented with IGF-1 showed lower transaminase levels, increased bile clearance and a reduction in vascular resistance when compared to those preserved in IGL-1solution alone. These benefits are mediated by activation of AKT and constitutive endothelial nitric oxide synthase (eNOs), as well as the inhibition of inflammatory cytokines such as TNF-α. Mitochondrial damage and oxidative stress were also ***: IGL-1  enrichment with IGF-1 increasedfatty liver graft preservation through AKT and eNOs activation, and prevented TNF-α release during normothermic reperfusion.

关键词： AKT Institut georges lopez-1 solution Insulin like growth factor-1 Ischemia reperfusion injury Nitric oxide Oxidative stress steatotic graft preservation

Event-Triggered Adaptive Fuzzy Finite Time Control of Fractional-Order Non-strict Feedback Nonlinear systems

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Journal of systems science & Complexity 2022年第6期35卷 2166-2180页

作者： XIN Chun LI Yuanxin NIU ben College of science Liaoning University of TechnologyJinzhou 121001China school of Information science and Engineering Shandong Normal UniversityJinan 250014China

In this article,the problem of event-triggered adaptive fuzzy finite time control of nonstrict feedback fractional order nonlinear systems is *** using the property of fuzzy basis function,the obstacle caused by algebraic loop problems is successfully ***,a new adaptive event-triggered scheme is designed under the unified framework of backstepping control method,which can largely reduce the amount of *** stability of the closed-loop system is ensured through fractional Lyapunov stability ***,the effectiveness of the proposed scheme is verified by simulation examples.

关键词： Backstepping control event-triggered control(ETC) fractional order nonlinear system(FONs) fuzzy logic system(FLs) non-strict feedback structure

A Holistic View of Polymer Aggregate

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Chinese Journal of Polymer science 2022年第3期40卷 231-232,I0004页

作者： ben Zhong Tang shenzhen Institute of Aggregate science and Technology School of Science and EngineeringThe Chinese University of Hong KongShenzhenChina

Polymers are *** living kingdom is full of natural polymers or biological macromolecules(e.g.,polysaccharides,polynucleotides and proteins),while the modern society is alive with synthetic polymers or manmade macromol... 详细信息

关键词： rubber fibers

Phytochemical constituents and antibacterial efficacy of the flowers of Peltophomm pterocarpum(DC.) Baker ex Heyne

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Asian Pacific Journal of Tropical Medicine 2011年第9期4卷 735-738页

作者： sukumaran s Kiruba s Mahesh M Nisha sR Miller Paul Z ben CP Jeeva s Centre for Biodiversity and Biotechnology Department of BotanyN.M.Christian College.Marthandam.Kanyakumari-629 165.Tamilnadu.India Department of Zoology Scott Christian College(Autonomous)NagercoilKanyakumari - 629 003.TamilnaduIndia Centre for Biodiversity and Biotechnology Department of BotanyN.M.Christian College.MarthandumKanyakumari - 629 165.TomilnaduIndia

Objective:To investigate the preliminary phytochemistry and antibacterial activity of the flower extract of Peltophorum ***:Phytochemical analysis was done by using the standard methods given by *** methanolic flower extract were tested against Escherichia coli,Klebsiella pneumonia,Pseudomonas *** aureus. Bacillus cereus,salmonella typhi,serratia marsecens,Acinetobacter *** sp., Proteus *** faecalis and streptococcus pyogenes by the agar disc diffusion ***:Preliminary phytochemical screening of flower extract showed the presence of phenolic compounds,***,steroids,tannins,xanthoproteic,carboxylic acids, coumarins and *** flower extract of Peltophorum pteroearpum showed significant activity against four gram positive(staphylococcus *** *** faecalis and streptococcus pyogenes) and three gram negative bacteria(Proteus mirabilis,Acinetohacter baumannii and serratia marsecens).out of 12 pathogenic bacteria ***:The findings of the present study confirm the presence of significant antibacterial activity against human pathogens in the flowers of Peltophorum pleracarpum.

关键词： Antibacterial activity Human pathogens Peltophorum pterocarpum Phytochemical screening

Impregnated sulfur in Carbonized Nitrogen-containing Porous Organic Frameworks as Cathode with High Rate Performance and Long Cycle Life for Lithium-sulfur Batteries

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Chemical Research in Chinese Universities 2019年第4期35卷 654-661页

作者： DONG Yan ben Teng Department of Chemistry Jilin University Changchun 130012P. R.China Department of Bioengineering Zunyi Medical University(Zhuhai Campus)Zhuhai 519041P.R.China

The undesirable cycling performance caused by soluble poly sulfides shuttling between anode and cathode has been considered as the main challenge that has hindered its practical applications for lithium-sulfiir(Li-s) batteries. To solve tliis issue effectively, a nitrogen-containing porous carbon, namely JUC-Z2-900,developed from a porous organic framework, namely JUC-Z2, bearing a high surface area(805 m^2/g),small pore size(0.5 mil) and nitrogen doping(2.15%, mass fraction), has been used as a host material for Li-s batteries. The micropores of JUC-Z2-900 can confine the smaller sulfur molecules s2-4, which can essentially alleviate the critical problem of poly sulfide ***, nitrogen-containing JUC-Z2-900 can promote chemical adsorption of sulfur. The above two factors can improve the electrochemical performance of Li-s batteries effectively. To compare the eftects of sulfur contents and melt-difiusion strategy in JUC-Z2-900/s composites, a series of JUC-Z2-900/s composites was synthesized and tlieir electrochemical perfbnnances were explored, indicating good rate performance and excellent cycling stability of the composites contributed by both appropriate mass percentage of sulfiir and its confinement in the micropores.

关键词： Li-s battery Nitrogen-containing porous carbon Porous organic framework

Gut Microbiome in Colorectal Cancer:Clinical Diagnosis and Treatment

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Genomics, Proteomics & Bioinformatics 2023年第1期21卷 84-96页

作者： Yali Liu Harry Cheuk-hay Lau Wing Yin Cheng Jun Yu Institute of Digestive Disease and The Department of Medicine and Therapeutics State Key Laboratory of Digestive DiseaseLi Ka Shing Institute of Health SciencesCUHK Shenzhen Research InstituteThe Chinese University of Hong KongHong Kong Special Administrative Region 999077China

Colorectal cancer(CRC)is one of the most frequently diagnosed cancers and the leading cause of cancer-associated *** studies have shown that both genetic and environmental risk factors contribute to the development of *** metagenomic studies of CRC have identified gut dysbiosis as a fundamental risk factor in the evolution of colorectal *** enormous efforts and substantial progresses have been made in understanding the relationship between human gut microbiome and CRC,the precise mechanisms involved remain *** data have shown a direct causative role of the gut microbiome in DNA damage,inflammation,and drug resistance in CRC,suggesting that modulation of gut microbiome could act as a powerful tool in CRC prevention and ***,we provide an overview of the relationship between gut microbiome and CRC,and explore relevant mechanisms of colorectal *** next highlight the potential of bacterial species as clinical biomarkers,as well as their roles in therapeutic *** limiting the clinical translation of gut microbiome and strategies for resolving current challenges are further discussed.

关键词： Gut microbiome Colorectal cancer Diagnostic biomarker Immunotherapy Chemotherapy