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Unraveling fundamental properties of power system resilience curves using unsupervised machine learning

Energy and AI 2024年第2期16卷 227-240页

作者： Bo Li ali mostafavi Urban Resilience.AI Lab Zachry Department of Civil and Environmental EngineeringTexas A&M University3136 TAMU College StationTX77843-3136USA

Power system is vital to modern societies,while it is susceptible to hazard ***,analyzing resilience characteristics of power system is *** standard model of infrastructure resilience,the resilience triangle,has been the primary way of characterizing and quantifying resilience in infrastructure systems for more than two ***,the theoretical model provides a one-size-fits-all framework for all infrastructure systems and specifies general characteristics of resilience curves(e.g.,residual performance and duration of recovery).Little empirical work has been done to delineate infrastructure resilience curve archetypes and their fundamental properties based on observational *** of the existing studies examine the characteristics of infrastructure resilience curves based on analytical models constructed upon simulated system *** is a dire dearth of empirical studies in the field,which hindered our ability to fully understand and predict resilience characteristics in infrastructure *** address this gap,this study examined more than two hundred power-grid resilience curves related to power outages in three major extreme weather events in the United *** the use of unsupervised machine learning,we examined different curve archetypes,as well as the fundamental properties of each resilience curve *** results show two primary archetypes for power grid resilience curves,triangular curves,and trapezoidal *** curves characterize resilience behavior based on three fundamental properties:*** functionality threshold,*** functionality recovery rate,and *** pivot *** archetypes explain resilience curves based on *** of sustained function loss and *** recovery *** longer the duration of sustained function loss,the slower the constant rate of *** findings of this study provide novel perspectives enabling better understanding and predicti

关键词： Power system Infrastructure resilience Unsupervised learning Time-series clustering Resilience curve

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Central composite design for optimization and formulation of desulphurization of iron ore concentrate using atmospheric leaching process

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Journal of Iron and Steel Research International 2018年第1期25卷 57-64页

作者： ali mostafavi Hassan Rezvanipour Dariush Afzali Tayebeh Shamspur Amir Hajizadehomran Department of Chemistry Shahid Bahonar Universityof Kerman Kerman 84156-83111 Iran Gol-e-Gohar Iron Ore Mining and Industrial Company Sirjan Km 50 of Shiraz road 111/78185 Kerman Iran Department of Environment Institute of Science and HighTechnology and Environmental Sciences GraduateUniversity of Advanced Technology Kerman 76311-33131Iran

Owing to the negative effects of sulphur in iron ore on steelmaking process and environment, a tank leaching process was performed in atmospheric conditions to remove the sulphur from the iron ore concentrate and simultaneously to transform sulphide minerals into useful by-products. To achieve desirable sulphur removal rate and efficiency, central composite design was adopted as a response surface methodology for the optimization and evaluation of the process. A full-quadratic polynomial equation between the sulphur removal and the studied parameters was established to assess the behaviour of sulphur removal as a function of the factors and to predict the results in various conditions. The optimum conditions were obtained based on the variance tests and response surface plots, from which the optimized ranges for each factor resulting in the best response （corresponding to the highest percentage of desulphurization） could be then achieved. The results show that most desirable conditions are atmospheric leaching in 1.39 mol/dm3 nitric acid and 0.88 mol/dm3 sulphuric acid for 47 h. The designed process under the optimized desulphurization conditions was applied to a real iron ore concentrate. More than 75% of the total sulphur was removed via the leaching process. In addition to the desulphurization, the conversion of sulphide-bearing minerals into useful by-products, extraction of valuable metals, and executing the process under atmospheric conditions are the other advantages of the proposed method.

关键词： Desulphurization Iron ore concentrate Sulphide mineral leaching Central composite design Atmosphericleaching process

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Revealing the linguistic and geographical disparities of public awareness to Covid-19 outbreak through social media

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International Journal of Digital Earth 2022年第1期15卷 868-889页

作者： Binbin Lin Lei Zou Nick Duffield ali mostafavi Heng Cai Bing Zhou Jian Tao Mingzheng Yang Debayan Mandal Joynal Abedin Department of Geography Texas A&M UniversityCollege StationTXUSA Department of Electrical & Computer Engineering Texas A&M UniversityCollege StationTXUSA Department of Civil & Environmental Engineering Texas A&M UniversityCollege StationTXUSA Department of Visualization Texas A&M UniversityCollege StationTXUSA

The Covid-19 has presented an unprecedented challenge to public health ***,residents in different countries showed diverse levels of Covid-19 awareness during the outbreak and suffered from uneven health *** study analyzed the global Twitter data from January 1st to June 30th,2020,to answer two research *** are the linguistic and geographical disparities of public awareness in the Covid-19 outbreak period reflected on social media?Does significant association exist between the changing Covid-19 awareness and the pandemic outbreak?We established a Twitter data mining framework calculating the Ratio index to quantify and track *** lag correlations between awareness and health impacts were examined at global and country *** show that users presenting the highest Covid-19 awareness were mainly those tweeting in the official languages of India and *** countries showed more disparities in awareness than European countries,and awareness in Eastern Europe was higher than in central ***,the Ratio index had high correlations with global mortality rate,global case fatality ratio,and country-level mortality rate,with 21-31,35-42,and 13–18 leading days,*** study yields timely insights into social media use in understanding human behaviors for public health research.

关键词： Social media Covid-19 public awareness geographical disparities linguistic disparities

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A Novel Vision of Reinforcing Nanofibrous Masks with Metal Nanoparticles:Antiviral Mechanisms Investigation

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Advanced Fiber Materials 2023年第4期5卷 1273-1317页

作者： Farinaz Hadinejad Hamed Morad Mohsen Jahanshahi ali Zarrabi Hamidreza Pazoki‑Toroudi Ebrahim mostafavi Nanotechnology Research Institute Faculty of Chemical EngineeringBabol Noushirvani University of TechnologyBabol ***Iran Department of Pharmaceutics and Pharmaceutical Nanotechnology School of PharmacyIran University of Medical SciencesTehran ***Iran Ramsar Campus Mazandaran University of Medical SciencesRamsar ***Iran Department of Biomedical Engineering Faculty of Engineering and Natural SciencesIstinye UniversityIstanbul 34396Turkey Physiology Research Center Faculty of MedicineIran University of Medical SciencesTehran ***Iran Department of Physiology Faculty of MedicineIran University of Medical SciencesTehran ***Iran Stanford Cardiovascular Institute Stanford University School of MedicineStanfordCA 94305USA Department of Medicine Stanford University School of MedicineStanfordCA 94305USA

Prevention of spreading viral respiratory disease,especially in case of a pandemic such as coronavirus disease of 2019(COVID-19),has been proved impossible without considering obligatory face mask-wearing protocols for both healthy and contaminated *** widespread application of face masks for long hours and almost everywhere increases the risks of bacterial growth in the warm and humid environment inside the *** the other hand,in the absence of antiviral agents on the surface of the mask,the virus may have a chance to stay alive and be carried to different places or even put the wearers at risk of contamination when touching or disposing the *** this article,the antiviral activity and mechanism of action of some of the potent metal and metal oxide nanoparticles in the role of promising virucidal agents have been reviewed,and incorporation of them in an electrospun nanofibrous structure has been considered an applicable method for the fabrication of innovative respiratory protecting materials with upgraded safety levels.

关键词： Nanoshield Facemask Antiviral Metal nanoparticles Electrospinning Immunity booster

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Tioxolone niosomes exert antileishmanial effects on Leishmania tropica by promoting promastigote apoptosis and immunomodulation

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Asian Pacific Journal of Tropical Medicine 2019年第8期12卷 365-374页

作者： Maryam Hakimi Parizi Iraj Sharifi Saeedeh Farajzadeh Abbas Pardakhty Mohammad Hossein Daie Parizi Hamid Sharifi ali Reza Keyhani Mahshid mostafavi Mehdi Bamorovat Ahmad Khosravi Daryoush Ghaffari Leishmaniasis Research Center Kerman University of Medical SciencesKermanIran Department of Pediatric dermatology Kerman University of Medical SciencesKermanIran Pharmaceutics Research Center Neuropharmacology InstituteKerman University of Medical SciencesKermanIran Department of Pediatrics Kerman University of Medical SciencesKermanIran HIV/STI Surveillance Research Center and WHO Collaborating Center for HIV SurveillanceInstitute for Futures Studies in HealthKerman University of Medical SciencesKermanIran Research Center of Tropical and Infectious Diseases Kerman University of Medical SciencesKermanIran

Objective: To explore the antileishmanial effect of tioxolone and its niosomal form against Leishmania tropica. Methods: Tioxolone niosomes were prepared by the hydration method and were evaluated for morphology, size, release study, and encapsulation efficiency. The cytotoxicity of tioxolone and its niosomal form was measured by MTT assay, leishmanicidal activity against promastigote and amastigote by MTT assay, apoptosis by flow cytometry, IL-12, IL-10 and metacaspase gene expression levels by q-PCR. Results: Span/Tween 40 and Span/Tween 60 niosomes had good physical stability as depicted in their size distribution curves and high encapsulation efficiency(>99%). The release profile of the entrapped compounds showed Fickian’s model of tioxolone delivery based on diffusion through lipid bilayers. With the IC50 value for amastigote as(24.5±2.1) μg/mL and selectivity index as 10.5, the Span/Tween 60 niosome(NT2) had a superior effect to other drugs. The CC50 value and IC50 of promastigote value for NT2 were(257.5±24.5) μg/mL and(164.8±20.6) μg/mL, respectively. The flow cytometric analysis showed that tioxolone and niosomal forms induced apoptosis of Leishmania tropica promastigotes in a dose-dependent manner. NT2 increased the expression level of IL-12 and metacaspase genes and decreased the expression level of the IL-10 ***: Niosomes of tioxolone play an immunomodulatory role in increasing Th1 cytokine profile and inhibiting the Th2 cytokine profile. It could be used for treatment of anthroponotic cutaneous leishmaniasis.

关键词： Niosome Tioxolone Leishmania tropica Apoptosis

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