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Frequency regulation by fuzzy and binary control in a hybrid islanded microgrid

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Journal of Modern Power Systems and Clean Energy 2015年第3期3卷 429-439页

作者： Pamela MANJARRES Om malik Department of Electrical and Computer Engineering University of CalgaryCalgaryABCanada

Islanded microgrids must be self-sufficient in terms of frequency and voltage control due to their islanded operation.A control strategy for frequency regulation by combining the operation of a wind generator,a diesel generator,a battery energy storage system and a dump load in a microgrid is proposed in this *** the proposed strategy,the control task is partitioned into two subtasks:1)choosing the appropriate element to be used for regulation,and 2)providing frequency regulation.A global controller chooses the element to ***,the frequency regulation is provided by separate individual *** proposed control strategy is tested on a microgrid with mixed types of generation and modeled on *** monitoring the power of individual elements and system frequency,it is shown that the proposed control strategy operates *** proposed strategy facilitates the integration of renewable energy sources and enhances frequency regulation.

关键词： Frequency regulation Fuzzy control Hybrid microgrid Automatic operation

Nano Fluid Flow Analysis in the Presence of Slip Effects and Wall Properties by Means of Contraction and Expansion

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Communications in Theoretical Physics 2018年第9期69卷 337-343页

作者： Hina Sadaf Rabia.malik DBS&H CEMENational University of Sciences and TechnologyIslamabadPakistan Department of Mathematics and Statistics International Islamic UniversityIslamabad 44000Pakistan

The present article is a study of mixed convective peristaltic flow of Cu-blood nanofluid confined in a non-uniform tube along with the velocity slip conditions and wall *** or catheterized special effects are also taken into *** utilization of the large wavelength and small reynolds number approximation,the non-dimensional governing differential equation took a more simplified form,which is then solved for the exact ***,these outcomes are offered graphically and are debated in *** profile for pure blood as well as Cu-blood and no-slip and slip effects are also discussed *** pattern is also discussed for different physical parameters.

关键词： peristaltic flow exact solution viscous nanofluid mixed convection velocity slip conditions nonuniform tube endoscopic tube wall properties

Complex Network Formation and Analysis of Online Social Media Systems

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Computer Modeling in Engineering & Sciences 2022年第3期130卷 1737-1750页

作者： Hafiz Abid Mahmood malik Faculty of Computer Studies Arab Open UniversityA’aliKingdom of Bahrain

To discover and identify the influential nodes in any complex network has been an important *** is a significant factor in order to control over the *** control on a network,any information can be spread and stopped in a short span of *** targets can be achieved,since network of information can be extended and as well ***,information spread and community formation have become one of the most crucial issues in the world of SNA(Social Network Analysis).In this work,the complex network of twitter social network has been formalized and results are *** this purpose,different network metrics have been *** of the network is provided in its original form and then filter out(different percentages)from the network to eliminate the less impacting nodes and edges for better *** network is analyzed according to different centrality measures,like edge-betweenness,betweenness centrality,closeness centrality and eigenvector *** nodes are detected and their impact is observed on the *** communities are analyzed in terms of network coverage considering theMinimum Spanning Tree,shortest path distribution and network *** is found that these are the very effective ways to find influential and central nodes from such big social networks like Facebook,Instagram,Twitter,LinkedIn,etc.

关键词： Complex network data extraction nodes and edges network visualization social media network main hubs centrality measures

REE geochemistry of core sediments of Cauvery delta,India for provenance studies

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Acta Geochimica 2020年第4期39卷 512-526页

作者： malik Zubair Ahmad Pramod Singh Department of Geology Satellite Campus LehUniversity of KashmirLehJammu&Kashmir 194104India Department of Earth Sciences School of Physical Chemical and Applied SciencesPondicherry UniversityKalapetPondicherry 605014India

The rare earth element(REE)geochemical composition of sediments from two cores were used to investigate the provenances of the Late Pleistocene to Holocene sediments of Cauvery delta,South *** chondrite-normalized REE patterns and bi-variant plots of Th/Co ***/Sc and La/Th ***/Yb indicated felsic source of ***-normalized plots of REE in both cores are almost parallel and exhibit similar fractionation ratio(Ce/Yb)_N of^***,persistence in REEs patterns implies either uniform source rocks and/or efficient homogenization of sediments during transportation and ***-normalized patterns of the samples show enrichment of light rare earth elements and flat pattern of heavy rare earth elements;such patterns imply dominance of felsic composition rocks in the ***,these samples show quite resemblance with Charnockites and Gneisses of Palani and Kodaikanal hill ***-normalized REE patterns of the Pleistocene sediments of Uttrangudi core show similar abundance,fractionation,and Eu anomaly values as of selected samples from Tertiary rocks near southwest part of the *** attribute the increased input from this region to the upliftment because of tectonic activity and lowering of sea level during the Pleistocene.

关键词： Delta sediments REEs Provenance Rainfall Relief

Progressive events in supervisory control and compositional verification

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Control Theory and Technology 2014年第3期12卷 317-329页

作者： Simon Ware Robi malik School of Electronic and Electrical Engineering Nanyang Technological UniversitySingapore Department of Computer Science University of WaikatoHamilton New Zealand

This paper investigates some limitations of the nonblocking property when used for supervisor synthesis in discrete event systems. It is shown that there are cases where synthesis with the nonblocking property gives undesired results. To address such cases, the paper introduces progressive events as a means to specify more precisely how a synthesised supervisor should complete its tasks. The nonblocking property is modified to take progressive events into account, and appropriate methods for verification and synthesis are proposed. Experiments show that progressive events can be used in the analysis of industrial-scale systems, and can expose issues that remain undetected by standard nonblocking verification.

关键词： Model validation in design methods Controller constraints and structure Computational issues

Dynamic Flow Control Strategies of Vehicle SCR Urea Dosing System

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Chinese Journal of Mechanical Engineering 2015年第2期28卷 276-284页

作者： LIN Wei ZHANG Youtong ASIF malik Laboratory of Clean Vehicles Beijing Institute of Technology

Selective Catalyst Reduction（SCR）Urea Dosing System（UDS）directly affects the system accuracy and the dynamic response performance of a ***,the UDS dynamic response is hard to keep up with the changes of the engine＇s operating *** will lead to low NO_χconversion efficiency or NH_3 *** order to optimize the injection accuracy and the response speed of the UDS in dynamic conditions,an advanced control strategy based on an air-assisted volumetric UDS is *** covers the methods of flow compensation and switching working *** strategy is authenticated on an UDS and tested in different dynamic *** result shows that the control strategy discussed results in higher dynamic accuracy and faster dynamic response speed of *** inject deviation range is improved from being between-8%and 10%to-4%and 2%and became more stable than before,and the dynamic response time was shortened from 200 ms to 150 *** ETC cycle result shows that after using the new strategy the NH_3 emission is reduced by 60%,and the NO_χemission remains almost *** trade-off between NO_χconversion efficiency and NH_3 slip is *** studied flow compensation and switching working conditions can improve the dynamic performance of the UDS significantly and make the UDS dynamic response keep up with the changes of the engine＇s operating conditions quickly.

关键词： select catalyst reduction(SCR) urea dosing system(UDS) dynamic flow control strategies

Impact of ethnicity on the outcomes of acute pancreatitis:insights from US National Inpatient Sample

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Journal of Pancreatology 2024年第1期7卷 86-89页

作者： Ali Jaan Sheza.malik Joel E.McFarland Erik T.Olson Byron Cryer Department of Internal Medicine Rochester General HospitalRochesterNY Department of Gastroenterology Rochester General HospitalRochesterNY Department of Gastroenterology Baylor University Medical CenterDallasTX

Introduction Acute pancreatitis(AP),characterized by inflammation of the pancreas,is a critical medical condition with potentially life-threatening consequences.[1]Despite significant advancements in medical science,the prognosis of AP remains challenging and is influenced by a multitude of *** these factors,ethnicity has emerged as a compelling variable that may play a pivotal role in determining the outcomes and severity of AP.[2]Understanding the influence of ethnicity on AP outcomes has immense significance for several ***,it provides a unique opportunity to gain critical insights into the pathophysiology of the disease.

关键词： pancreatitis insight consequences

Downstream Decreasing Channel Capacity of a Monsoon-dominated Bengal Basin River: A Case Study of Dwarkeswar River, Eastern India

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Chinese Geographical Science 2020年第5期30卷 900-920页

作者： malik Sadhan PAL Subodh Chandra Department of Geography University of BurdwanBurdwan 713104West BengalIndia

Downstream changes in channel morphology and flow over the ephemeral Dwarkeswar River in the western part of the Bengal Basin, eastren India were investigated. The river stretches from the Proterozoic Granite Gneiss Complex to the recent Holocene alluvium, forming three distinctive geomorphological regions across the river basin: the pediplane and upper and lower alluvial areas. Sixty cross-sections from throughout the main trunk stream were surveyed and the bankfull width, depth, cross-sectional area, and maximum depth were measured. Sediment samples from each location were studied and the flow velocity, stream power, Manning’s roughness coefficient, and shear stress were estimated. The results show that the bankfull channel cross-section area, width, width-to-depth ratio, and channel capacity increased between the beginning and middle of the river. Thereafter, the size of the river started to decrease in the lower alluvial area. This was characterized by gentle gradients, cohesive bank materials with grass cover, and channel switching. Within the lower part of the river, the channel capacity was observed to diminish as the drainage area increased. This increased the bankfull flow frequency and accelerated large floodwater losses in the floodplain via overbank flows and floodways.

关键词： bankfull channel width bankfull discharge Dwarkeswar River flat alluvial plain channel degradation overbank flow and flood

Existence and controllability results to second order neutral differential equation with non-instantaneous impulses

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Journal of Control and Decision 2020年第3期7卷 286-308页

作者： Muslim malik Avadhesh Kumar School of Basic Sciences Indian Institute of Technology MandiMandiIndia

In this paper,existence and uniqueness of the solutions of the second order neutral differential equation with non-instantaneous impulses in a Hilbert space X are *** is followed by a brief discussion on the exact and trajectory ***,the strongly continuous cosine family of linear operators and Banach fixed point theorem are used to establish the ***,an example is given to illustrate the analytical findings.

关键词： Non-instantaneous impulsive system neutral differential equations deviated argument Banach fixed point theorem controllability