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Correlations of morphology and molecular alterations in traditional serrated adenoma

World Journal of Gastrointestinal Pathophysiology 2020年第4期11卷 78-83页

作者： Hongxing Gui Michael A Husson Rifat Mannan Department of Pathology and Laboratory Medicine Pennsylvania Hospital of the University of Pennsylvania Health SystemPhiladelphiaPA 19107United States

Traditional serrated adenoma was first reported by Longacre and FenoglioPresier in 1990.Their initial study described main features of this lesion,but the consensus diagnostic criteria were not widely adopted until recently.Traditional serrated adenoma presents with grossly protuberant configuration and pineconelike appearance upon endoscopy.Histologically,it is characterized by ectopic crypt formation,slit-like serration,eosinophilic cytoplasm and pencillate nuclei.Although much is now known about the morphology and molecular changes,the mechanisms underlying the morphological alterations are still not fully understood.Furthermore,the origin of traditional serrated adenoma is not completely known.We review recent studies of the traditional serrated adenoma and provide an overview on current understanding of this rare entity.

关键词： Traditional serrated adenoma Serrated polyps KRAS BRAF Colon

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Comparative Analysis between Conventional PI, Fuzzy Logic and Artificial Neural Network Based Speed Controllers of Induction Motor with Considering Core Loss and Stray Load Loss

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Journal of Mechanics Engineering and Automation 2017年第1期7卷 50-57页

作者： Md. rifat Hazari Effat Jahan Mohammad Abdul mannan Junji Tamura Department of Electrical and Electronic Engineering Kitami Institute of Technology 165 Koen-cho Kitami Hokkaido 090-8507 Japan Department of Electrical and Electronic Engineering American International University-Bangladesh Kemal Ataturk Avenue Banani Dhaka 1213 Bangladesh

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Stabilization of Wind Farm by Using PMSG Based Wind Generator Taking Grid Codes into Consideration

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Journal of Power and Energy Engineering 2018年第11期6卷 40-52页

作者： Md. rifat Hazari Mohammad Abdul mannan Atsushi Umemura Rion Takahashi Junji Tamura Department of Electrical and Electronic Engineering Kitami Institute of Technology (KIT) 165 Koen-cho Kitami Hokkaido 090-8507 Japan Department of Electrical and Electronic Engineering American International University-Bangladesh (AIUB) 408/1 Kuratoli Khilkhet Dhaka Bangladesh

This paper presents a new operational strategy for a large-scale wind farm (WF) which is composed of both fixed speed wind turbines with squirrel cage induction generators (FSWT-SCIGs) and variable speed wind turbines with permanent magnet synchronous generators (VSWT-PMSGs). FSWT-SCIGs suffer greatly from meeting the requirements of fault ride through (FRT), because they are largely dependent on reactive power. Integration of flexible ac transmission system (FACTS) devices is a solution to overcome that problem, though it definitely increases the overall cost. Therefore, in this paper, a new method is proposed to stabilize FSWT-SCIGs by using VSWT-PMSGs in a WF. This is achieved by injecting the reactive power to the grid during fault condition by controlling the grid side converter (GSC) of PMSG. The conventional proportional-integral (PI)-based cascaded controller is usually used for GSC which can inject small amount of reactive power during fault period. Thus, it cannot stabilize larger rating of SCIG. In this paper, a suitable fuzzy logic controller (FLC) is proposed in the cascaded controller of GSC of PMSG in order to increase reactive power injection and thus improve the FRT capability of WF during voltage dip situation due to severe network fault. To evaluate the proposed controller performance, simulation analyses are performed on a modified IEEE nine-bus system. Simulation results clearly show that the proposed method can be a cost-effective solution which can effectively stabilize the larger rating of SCIG compared to conventional PI based control strategy.

关键词： Wind Turbine Generator Fuzzy Logic Controller Power System Stability Power Converter PI Controller

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