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Optimal Islanding for Restoration of Power Distribution Systems Using Prim’s MST Algorithm

CSEE Journal of Power and Energy Systems 2022年第2期8卷 599-608页

作者： Kaka Sanaullah Mingchao Xia Mazhar Hussain Sharafat Hussain Ammar tahir the School of Electrical Engineering Beijing Jiaotong UniversityBeijing 10044China the School of Computer and Information Technology Beijing Jiaotong UniversityBeijing 10044China

Power systems can suffer outages,causing complete or partial disconnection of their power supply to load centers within the distribution *** Generation(DG)plays an essential role in power *** can be used as a back-up power source to enhance the resiliency and reliability of a power *** mode operations after outages in an active distributing network(ADN)is an effective way to maintain continuity of the power supply to significant *** is a quite complicated task for power system operators to find the power flow *** studies have primarily used pre-defined guidelines to find feasible power flow paths,and have focused on multiple islands for *** these studies,possible restoration pathfinding with DG was the fundamental weakness,and furthermore,the power of DG was limited to pre-defined boundaries in the form of ***,in this study,a new algorithm has been proposed,which uses the minimum spanning tree(MST)method to find the most feasible *** proposed algorithm starts at any random node(in this case,DG),and progresses by selecting the next node with the least cost(weight),thus considering all the nodes through which power will *** proposed model is formulated as a multiobjective program considering the priority of loads and minimum power *** effectiveness of the proposed model is tested on a modified IEEE69-bus distribution system with the penetration of multiple distributed generation sources at different *** were compared with the strategies found in literature,and the proposed method was found to be feasible and efficient.

关键词： Active distribution network distributed generation islanding multi-objective minimum spanning tree

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Ultra-high conductive 3D aluminum photonic crystal as sulfur immobilizer for high-performance lithium-sulfur batteries

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Nano Research 2021年第12期14卷 4776-4782页

作者： Jiajia Xiao Shengxuan Lin Zihe Cai tahir Muhmood Xiaobin Hu State Key Laboratory of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai200240China

The practical application of lithium-sulfur (Li-S) batteries is hampered by the insulative nature of sulfur, sluggish electrochemical kinetics, and large volume variation, which result in capacity-fading at a large current density and poor cycling stability. Herein, a three-dimensional (3D) aluminum photonic crystal encapsulating sulfur (APC@S) composite as a binder-free cathode for Li-S battery is reported. The 3D APC@S cathode can deliver a fantastic capacity of 1,517.8 mAh·g^(−1) at 0.5 C, and retains 712.7 mAh·g^(−1) after 1,500 cycles at 2 C with a decay rate of 0.02% per cycle. Even at a high rate of 5 C, the reversible capacity can still maintain at 680.7 mAh·g^(−1) after 1,000 cycles with a capacity retention of 74.8%. Furthermore, the assembled soft-packaged Li-S battery also exhibits high reversible capacity and stable cycling performance. The excellent electrochemical performance is attributed to the 3D hierarchical and continuously porous structure and high conductive aluminum-wall, which can effectively trap polysulfides, confine the volume expansion on cycling, and accelerate electron/ion transfer. It is expected that this high conductive metal cathode has a great future for the application of energy storage devices.

关键词： lithium-sulfur battery aluminum interconnected ordered high-conductivity photonic crystal

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Interaction properties of solitons for a couple of nonlinear evolution equations

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Chinese Physics B 2021年第1期30卷 185-190页

作者： Syed tahir Raza Rizvi Ishrat Bibi Muhammad Younis Ahmet Bekir Department of Mathematics COMSATS University IslamabadLahore CampusPakistan Punjab University College of Information Technology University of the PunjabLahorePakistan Neighbourhood of Akcaglan Imarli Street Number 28/426030EskisehirTurkey

We study one-and two-soliton solutions for the Cahn–Allen(CA) equation and the Brethorton equation. The CA equation has broad spectrum of applications especially in anti-phase boundary motion and it is used in phase-field *** the Brethorton equation is a model for dispersive wave systems, it is used to find the resonant nonlinear interaction among three linear modes. We use the Hirota bilinear method to obtain one-and two-soliton solutions to the CA equation and the Brethorton equation.

关键词： Hirota bilinear method soliton interaction evolution equations

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Power Aggregation Operators and Similarity Measures Based on Improved Intuitionistic Hesitant Fuzzy Sets and their Applications to Multiple Attribute Decision Making

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Computer Modeling in Engineering & Sciences 2021年第3期126卷 1165-1187页

作者： tahir Mahmood Wajid Ali Zeeshan Ali Ronnason Chinram Department of Mathematics and Statistics International Islamic UniversityIslamabadPakistan Algebra and Applications Research Unit Division of Computational ScienceFaculty of SciencePrince of Songkla UniversityHat YaiSongkhlaThailand

Intuitionistic hesitant fuzzy set(IHFS)is amixture of two separated notions called intuitionistic fuzzy set(IFS)and hesitant fuzzy set(HFS),as an important technique to cope with uncertain and awkward information in realistic decision *** contains the grades of truth and falsity in the formof the subset of the unit *** notion of IHFS was defined by many scholars with different conditions,which contain several ***,keeping in view the problems of already defined IHFSs,we will define IHFS in another way so that it becomes compatible with other existing *** examine the interrelationship between any numbers of IHFSs,we combined the notions of power averaging(PA)operators and power geometric(PG)operators with IHFSs to present the idea of intuitionistic hesitant fuzzy PA(IHFPA)operators,intuitionistic hesitant fuzzy PG(IHFPG)operators,intuitionistic hesitant fuzzy power weighted average(IHFPWA)operators,intuitionistic hesitant fuzzy power ordered weighted average(IHFPOWA)operators,intuitionistic hesitant fuzzy power ordered weighted geometric(IHFPOWG)operators,intuitionistic hesitant fuzzy power hybrid average(IHFPHA)operators,intuitionistic hesitant fuzzy power hybrid geometric(IHFPHG)operators and examined as well their fundamental *** special cases of the explored work are also ***,the similarity measures based on IHFSs are presented and their advantages are discussed along ***,we initiated a new approach to multiple attribute decision making(MADM)problem applying suggested operators and a mathematical model is solved to develop an approach and to establish its common sense and ***,comparative analysis,and graphical representation of the presented work are elaborated to show the reliability and effectiveness of the presented works.

关键词： Intuitionistic fuzzy sets intuitionistic hesitant fuzzy sets power aggregation operators similarity measures multiple attribute decision making

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Tropospheric Scintillation Estimation Using 10 Years Meteorological Data

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China Communications 2015年第3期12卷 43-49页

作者： Muhammad tahir PIAO Yan Muhammad Aslam Azizur Rahim School of Electronics and Information Engineering Changchun University of Science and Technology School of Computer Science and Technology Dalian University of Technology School of Software Dalian University of Technology

This paper presents estimation of tropospheric scintillation based on ITU-R model from previous 10 years meteorological *** As(p) is critical in designing of microwave links for achieving optimal *** are many phenomenons that cause degradation to signal during transmission through the earth's atmosphere one of them is *** estimation is based on measurements of surface temperature T and relative humidity *** parameter for ITU-R scintillation estimation model is the monthly average of wet part of refractivity *** software tool is employed to show the results for tropospheric scintillation in various seasons for time percentage p and frequencies ranging from 4GHz to 20 GHz.

关键词： troposphere scintillation ITU-R fading meteorology

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Exploiting Data Science for Measuring the Performance of Technology Stocks

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Computers, Materials & Continua 2023年第9期76卷 2979-2995页

作者： tahir Sher Abdul Rehman Dongsun Kim Imran Ihsan Department of Creative Technologies Air UniversityIslamabad44230Pakistan School of Computer Science and Engineering Kyungpook National UniversityDaegu41566Korea

The rise or fall of the stock markets directly affects investors’interest and ***,it is necessary to measure the performance of stocks in the market in advance to prevent our assets from suffering significant *** our proposed study,six supervised machine learning(ML)strategies and deep learning(DL)models with long short-term memory(LSTM)of data science was deployed for thorough analysis and measurement of the performance of the technology *** discussion are Apple Inc.(AAPL),Microsoft Corporation(MSFT),Broadcom Inc.,Taiwan Semiconductor Manufacturing Company Limited(TSM),NVIDIA Corporation(NVDA),and Avigilon Corporation(AVGO).The datasets were taken from the Yahoo Finance API from 06-05-2005 to 06-05-2022(seventeen years)with 4280 *** already noted,multiple studies have been performed to resolve this problem using linear regression,support vectormachines,deep long short-termmemory(LSTM),and many other *** this research,the Hidden Markov Model(HMM)outperformed other employed machine learning ensembles,tree-based models,the ARIMA(Auto Regressive IntegratedMoving Average)model,and long short-term memory with a robust mean accuracy score of *** statistical analyses and measurements for machine learning ensemble algorithms,the Long Short-TermModel,and ARIMA were also carried out for further investigation of the performance of advanced models for forecasting time series ***,the proposed research found the best model to be HMM,and LSTM was the second-best model that performed well in all aspects.A developedmodel will be highly recommended and helpful for early measurement of technology stock performance for investment or withdrawal based on the future stock rise or fall for creating smart environments.

关键词： Machine learning data science smart environments stocks movement deep learning stock marketing

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A novel extended Portuguese of Interactive and Multi-Criteria Decision Making and Archimedean Bonferroni mean operators based on prospect theory to select green supplier with complex q-rung orthopair fuzzy information

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CAAI Transactions on Intelligence Technology 2023年第1期8卷 177-191页

作者： Zeeshan Ali tahir Mahmood Jeonghwan Gwak Naeem Jan Department of Mathematics&Statistics International Islamic University IslamabadIslamabadPakistan Department of Software Korea National University of TransportationChungjuKorea Department of Biomedical Engineering Korea National University of TransportationChungjuKorea Department of AI Robotics Engineering Korea National University of TransportationChungjuKorea Department of IT&Energy Convergence(BK21 FOUR) Korea National University of TransportationChungjuKorea

The word sustainable or green supply chain refers to the concept of incorporating sustainable environmental procedures into the traditional supply *** supply chain management gives a chance to revise procedures,materials and operational *** the fuzziness of assessing data and the spiritual situations of experts in the decision-making procedure are two important *** main contribution of this analysis is to derive the theory of Archimedean Bonferroni mean operator for complex qrung orthopair fuzzy(CQROF)information,called the CQROF Archimedean Bonferroni mean and CQROF weighted Archimedean Bonferroni mean operators which are very valuable,dominant and classical type of aggregation operators used for examining the interrelationship among the finite number of attributes in modern data fusion *** and well-used properties of the initiated theories are also diagnosed with some special ***,the theory of extended TODIM tool using the prospect theory based on CQROF information was discovered,which play an essential and critical role in the environment of fuzzy set ***,a real life problem by computing a green supply chain management based on the initiated CQROF operators was evaluated and fully illustrating the feasibility and efficiency of the diagnosed work with the help of a comparison between existing and prevailing theories.

关键词： fuzzy set fuzzy sets

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Multi-scale habitat selection and impacts of climate change on the distribution of four sympatric meso-carnivores using random forest algorithm

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Ecological Processes 2020年第1期9卷 709-725页

作者： tahir Ali Rather Sharad Kumar Jamal Ahmad Khan Department of Wildlife Sciences Aligarh Muslim UniversityAligarhUttar Pradesh 202002India The Corbett Foundation 81-88Atlanta BuildingNariman PointMumbai 400021India

Background:The habitat resources are structured across different spatial scales in the environment,and thus animals perceive and select habitat resources at different spatial *** to adopt the scale-dependent framework in species habitat relationships may lead to biased ***-scale species distribution models(SDMs)can thus improve the predictive ability as compared to single-scale *** study outlines the importance of multi-scale modeling in assessing the species habitat relationships and may provide a methodological framework using a robust algorithm to model and predict habitat suitability maps(HSMs)for similar multi-species and multi-scale ***:We used a supervised machine learning algorithm,random forest(RF),to assess the habitat relationships of Asiatic wildcat(Felis lybica ornata),jungle cat(Felis chaus),Indian fox(Vulpes bengalensis),and golden-jackal(Canis aureus)at ten spatial scales(500-5000 m)in human-dominated *** calculated out-of-bag(OOB)error rates of each predictor variable across ten scales to select the most influential spatial scale *** scale optimization(OOB rates)indicated that model performance was associated with variables at multiple spatial *** species occurrence tended to be related strongest to predictor variables at broader scales(5000 m).Multivariate RF models indicated landscape composition to be strong predictors of the Asiatic wildcat,jungle cat,and Indian fox *** the same time,topographic and climatic variables were the most important predictors determining the golden jackal *** models predicted range expansion in all four species under future climatic ***:Our results highlight the importance of using multiscale distribution models when predicting the distribution and species habitat *** wide adaptability of meso-carnivores allows them to persist in human-dominated regions and may even thrive in disturbed habi

关键词： Multiple-scale Multi-species Sympatric carnivores Species distribution modeling Bandhavgarh Climate change

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Vibrations of FGM thin cylindrical shells with exponential volume fraction law

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Applied Mathematics and Mechanics(English Edition) 2009年第5期30卷 607-615页

作者： Abdul Ghafar Shah tahir Mahmood Muhammad Nawaz Naeem Department of Mathematics The Islamia University of Bahawalpur Department of Mathematics Government College University

In this paper, the influence of an exponential volume fraction law on the vibration frequencies of thin functionally graded cylindrical shells is studied. Material properties in the shell thickness direction are graded in accordance with the exponential law. Expressions for the strain-displacement and curvature-displacement relationships are taken from Love＇s thin shell theory. The Rayleigh-Ritz approach is used to derive the shell eigenfrequency equation. Axial modal dependence is assumed in the characteristic beam functions. Natural frequencies of the shells are observed to be dependent on the constituent volume fractions. The results are compared with those available in the literature for the validity of the present methodology.

关键词： functionally graded material (FGM) vibration cylindrical shell Rayleigh- Ritz method exponential volume fraction law

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Pollution and health risk assessment of heavy metals in waters around mine sites of Elazig(Eastern Turkey)

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Journal of Mountain Science 2023年第5期20卷 1293-1306页

作者： H.Alim BARAN Mahmut tahir NALBANTCILAR Nida KOKTAN Batman University Faculty of Engineering-ArchitectureGeological Engineering DepartmentBatman 72100Turkey Konya Technical University Geological Engineering DepartmentKonya 42250Turkey ETI Krom INC. Elazig 23400Turkey

Turkey’s Eastern Anatolia Region is the oldest known mineral mining area of Maden and *** production in the Alacakaya field constitutes 50% of the country’s exports,and copper mines in the Maden region account for approximately 12% of the country’s copper *** is a risk of water pollution due to significant mine waste which affects the Inci and Maden *** water needs of many settlements are met from these streams,which run through these two mine *** study investigated the water pollution in the rivers.25 water samples were collected during the dry and rainy periods,and the Al,Cr,Cu,Fe,Li,Mn,Ni,Pb,Sr and Zn contents of these samples were examined in terms of *** of element concentrations and creation of spatial distribution maps were performed using ArcGIS *** distribution maps,correlation and cluster analysis indicate that the source of heavy metals observed in waters is mine *** heavy metal content of the samples is higher in the dry period,the high concentration values are obtained from the mine sites,the decrease in the concentrations throughout the flow during the rainy period,are indicators of the effect of the mines on the water *** a result of the comparison from the analysis results of water samples with World Health Organization(WHO),Environmental Protection Agency(EPA)and European Commission(EC)standards,the element values of Al,Cr,Fe,Mn,Ni and Pb exceeded the permissible values for *** concentrations of these elements for dry period samples are:0-6.411 mg L^(-1),0.006-0.235 mg L^(-1),0-13.433 mg L^(-1),0-0.316 mg L^(-1),0-0.495 mg L^(-1),0-0.065mg L^(-1),and for rainy period samples are 0-1.698mg/L,0-0.2 mg L^(-1),0-9.033 mg L^(-1),0-0.173 mg L^(-1),0-0.373 mg L^(-1),0-0.034 mg L^(-1),*** the waters in the region are polluted by heavy metals,it has been determined that there is no noncarcinogenic hazard as a result of the calculation of the hazard i

关键词： Eastern Turkey GIS Mining Heavy metals Risk assessment Water pollution

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