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Robust Stability Analysis of Smith Predictor Based Interval Fractional-Order Control Systems:A Case Study in Level Control Process

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IEEE/CAA Journal of Automatica Sinica 2023年第3期10卷 762-780页

作者： Majid Ghorbani Mahsan tavakoli-Kakhki Aleksei Tepljakov Eduard Petlenkov Department of Computer Systems Tallinn University of TechnologyTallinn 12618Estonia Faculty of Electrical Engineering K.N.Toosi University of TechnologyTehran ***Iran IEEE

The robust stability study of the classic Smith predictor-based control system for uncertain fractional-order plants with interval time delays and interval coefficients is the emphasis of this *** uncertainties are a type of parametric uncertainties that cannot be avoided when modeling real-world ***,in the considered Smith predictor control structure it is supposed that the controller is a fractional-order proportional integral derivative(FOPID)*** the best of the authors'knowledge,no method has been developed until now to analyze the robust stability of a Smith predictor based fractional-order control system in the presence of the simultaneous uncertainties in gain,time-constants,and time *** three primary contributions of this study are as follows:ⅰ)a set of necessary and sufficient conditions is constructed using a graphical method to examine the robust stability of a Smith predictor-based fractionalorder control system—the proposed method explicitly determines whether or not the FOPID controller can robustly stabilize the Smith predictor-based fractional-order control system;ⅱ)an auxiliary function as a robust stability testing function is presented to reduce the computational complexity of the robust stability analysis;andⅲ)two auxiliary functions are proposed to achieve the control requirements on the disturbance rejection and the noise ***,four numerical examples and an experimental verification are presented in this study to demonstrate the efficacy and significance of the suggested technique.

关键词： Interval uncertainty FOPID controller fractional-order systems robust stability analysis smith predictor

Probabilistic stability of uncertain composite plates and stochastic irregularity in their buckling mode shapes:A semi-analytical non-intrusive approach

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Frontiers of Structural and Civil Engineering 2023年第2期17卷 179-190页

作者： Arash tavakoli MALEKI Hadi PARVIZ Akbar A.KHATIBI Mahnaz ZAKERI Advanced Structures Research Laboratory K.N.Toosi University of TechnologyTehran 16569-83911Iran Faculty of New Sciences and Technologies University of TehranTehran 16569-83911Iran School of Engineering RMIT UniversityMelbourne VIC 3001Australia

In this study,the mechanical properties of the composite plate were considered Gaussian random fields and their effects on the buckling load and corresponding mode shapes were studied by developing a semi-analytical nonintrusive *** random fields were decomposed by the Karhunen−Loève *** strains were defined based on the assumptions of the first-order and higher-order shear-deformation *** equations of motion were extracted using Euler-Lagrange *** probabilistic response space was obtained by employing the nonintrusive polynomial chaos ***,the effect of spatially varying stochastic properties on the critical load of the plate and the irregularity of buckling mode shapes and their sequences were studied for the first *** findings showed that different shear deformation plate theories could significantly influence the reliability of thicker plates under compressive *** is suggested that a linear relationship exists between the mechanical properties’variation coefficient and critical loads’variation ***,in modeling the plate properties as random fields,a significant stochastic irregularity is obtained in buckling mode shapes,which is crucial in practical applications.

关键词： uncertain composite plate stochastic assume mode method Karhunen−Loève theorem polynomial chaos approach plate buckling irregularity in buckling mode shapes

Effects of propeller load fluctuations on performance and emission of a lean-burn natural gas engine at part-load conditions

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Propulsion and Power Research 2022年第2期11卷 196-208页

作者： S.tavakoli J.Schramm E.Pedersena Department of Marine Technology Norwegian University of Science and TechnologyTrondheimNorway Department of Mechanical Engineering Technical University of DenmarkLyngbyDenmark

Providing stable combustion of lean-burn natural gas engines was always a bigchallenge, particularly during a low load operation. In transient sea conditions, there is an additional concern due to irregular time-varying loads. Therefore, this study aimed at investigatingthe part-load operation of a marine spark-ignition lean-burn natural gas engine by simulatingthe entire engine. The engine’s essential components are modeled, including air manifold,intake valves, fuel system, controllers, combustion chamber, exhaust valves, exhaust manifoldand *** steady-state, the results of emission compounds from modeling have been compared tomeasured data from 25% to 100% loads. For transient conditions, for the sample time of about50 min, the fuel flow and turbocharger output are selected from the vessel logged data andcompared with the simulation results. The model has shown the great potential of predictingthe engine response throughout the steady-state and transient conditions. Simulating the engineat part-load transient condition showed that the unburned hydrocarbon formation, known asmethane slip in lean-burn gas engines, is more than the part-load steady-state. This increaseof methane slip is due to the combustion instability in lower loads and flame extinguishingin such transient conditions. The engine measured data shows a double amount of methane slipin a 25% load than the 100% load in steady-state. However, the simulation output in the transient conditions confirms an increase in methane slip over four times than equivalentsteady-state load. Moreover, the lean-burn gas engine releases less NOX in part-load operationin a steady-state due to lower in-cylinder temperature. In transient conditions, there is remarkable instability in excess air ratio. Due to this instability, there is a rich mixture in instantaneoustime steps during loads up. Therefore, it will result in an unusually high amount of NOX, andmore than two times in comparison with the equivalent

关键词： Lean-burn combustion Emission formation Methane slip NOX Part-load operation

Acute kidney injury following autoimmune hemolytic anemia due to simultaneous use of ciprofloxacin and hydrochlorothiazide:A case report and review of the literature

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Rheumatology & Autoimmunity 2023年第1期3卷 56-62页

作者： Fatemeh Yaghoubi Farnaz tavakoli Davood Dalil Hoda Jamaloo Nephrology Research Center Shariati HospitalTehran University of Medical SciencesTehranIran Student Research Committee Faculty of MedicineShahed UniversityTehranIran

Introduction:Rare cases of autoimmune hemolytic anemia(AHA)associated with using ciprofloxacin or hydrochlorothiazide(HCTZ)alone have been reported ***,simultaneous use of both drugs could lead to a severe clinical *** study presents the combination of acute kidney injury(AKI)and AHA following the simultaneous use of ciprofloxacin and HCTZ for three *** Description:A 42-year-old Iranian woman presented to the emergency department with symptoms of fatigue,lethargy,nausea and vomiting,ataxia,oliguria,dark urine,and *** patient reported using HCTZ due to high blood pressure and ciprofloxacin for a urinary tract infection three days before *** laboratory findings revealed hemolytic anemia with a hemoglobin of 7 g/dl,the strongly positive direct and indirect Coombs test,high level of lactate dehydrogenase(820 IU/L),and hyperbilirubinemia(total:3 mg/dL and direct:1.2 mg/dL).Furthermore,hyperkalemia(5.2 mEq/L),hyperphosphatemia(6.2 mg/dL),high levels of BUN(100 mg/dL),and creatinine rise(6.8 mg/dL)were *** analysis showed 2+blood,4-6 red blood cells,and cola-colored *** on the findings,druginduced AHA,followed by AKI,was ***,the drugs were stopped and steroid therapy was *** patient underwent four sessions of hemodialysis to improve the ***:Healthcare providers should be aware of the life-threatening adverse effects of commonly used drugs such as ciprofloxacin or *** timely diagnosis of the offending drugs leads to avoiding the persistence of the risk factor and the deterioration of the patient's clinical condition.

关键词： acute kidney injury autoimmune hemolytic anemia ciprofloxacin hydrochlorothiazide

Evolution of seasonal land surface temperature trend in pond-breeding newt(Neurergus derjugini) in western Iran and eastern Iraq

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Ecological Processes 2023年 217-231页

作者： Peyman Karami Sajad tavakoli Mina Esmaeili Department of Environmental Sciences Faculty of Natural Resources and Environment Sciences Malayer University Department of Environmental and Forest Science Faculty of Natural Resources and Environment Science and Research Branch Islamic Azad University Department of Biology Faculty of Science Razi University

Background Temperature, as one of the effective environmental stimuli in many aspects of species life and ecosystems, can affect amphibians in many ways. Knowing and predicting temperature change and its possible effects on the habitat suitability and movements of amphibians have led many researchers to use climate change scenarios and species distribution models(SDMs). One of the important remote-sensing products that received less attention of conservation biologists is the land surface temperature(LST). Due to the small difference between LST and air temperature, this component can be used to investigate and monitor the daily and seasonal changes of habitats. This study aims to investigate the seasonal trend of LST in the habitat suitability and connectivity of the critically endangered newt(Neurergus derjugini) in its small distribution range, using the MODIS LST time series(2003 to 2021) and with the help of SDMs, Mann–Kendall(MK) and Pettitt non-parametric *** In the last decade, the increasing trend of LST versus its decreasing trends is obvious. Based on MK and Pettitt tests, in the winter and spring, with the decrease in latitude of 35.45° and increase in longitude of 46.14°, the core populations which are located in the southeast have experienced an increase in temperature. Considering the period time of breeding and overwintering, the continuity of winter and spring can be effective on the survival of adult newts as well as larvae in the microclimate. Linkages with the highest current flow between core populations in the winter and summer are the most likely to be vulnerable. At the level of habitat, the increase in LST is proportional to the trend of thermal landscape changes, and all seasons have had an increase in LST, but in winter and summer, the largest area of the habitat has been involved. By continuing the current trend, many high-altitude southern habitats in Iran will be endangered, and the species will be at risk of local extinction.

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Theoretical Investigation of Adsorption Effects of Granisetron Anticancer Drug over BN(7,7-7) Nanotube as a Factor of Drug Delivery: a DFT Study

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Chinese Journal of Structural Chemistry 2019年第9期38卷 1421-1431页

作者： ZIBA tavakoli Department of Chemistry Genaveh Branch Islamic Azad University Department of Chemistry Gachsaran Branch Islamic Azad University

In the present work, the interaction between drug Granisetron(GRS) and BN(7,7-7) nanotube by density functional theory(DFT) calculations in the solvent water has been investigated. The non-bonded interaction effects of the molecule GRS with BN(7,7-7) nanotube on chemical shift tensors, natural charge and electronic properties such as the energy gap between HOMO and LUMO, global hardness, electronegativity and electronic chemical potential have been also detected. The natural bond orbital(NBO) analysis suggested that charge transfer depended between GRS and nanotube and induces a dipole moment in the complex. Then, the possibility of the use of BN(7,7-7) nanotube for GRS delivery to the diseased cells has been established.

关键词： granisetron BN(7,7-7) nanotube DFT adsorption NBO

Is machine learning redefining the perovskite solar cells?

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Journal of Energy Chemistry 2022年第3期31卷 74-90,I0004页

作者： Nishi Parikh Meera Karamta Neha Yadav Mohammad Mahdi tavakoli Daniel Prochowicz Seckin Akin Abul Kalam Soumitra Satapathi Pankaj Yadav Department of Science School of TechnologyPandit Deendayal Energy UniversityGandhinagar 382007GujaratIndia Department of Electrical Engineering School of TechnologyPandit Deendayal Energy UniversityGandhinagar 382007GujaratIndia Department of Telecommunication Ministry of CommunicationMumbai LSAMumbai 400072MaharashtraIndia Department of Electrical Engineering and Computer Science Massachusetts Institute of TechnologyCambridgeMA 02139USA Institute of Physical Chemistry Polish Academy of SciencesKasprzaka 44/5201-224 WarsawPoland Department of Metallurgical and Materials Engineering Karamanoglu Mehmetbey University70200 KaramanTurkey Department of Chemistry Faculty of ScienceKing Khalid UniversityAbha 61413P.O.Box 9004Saudi Arabia Department of Physics Indian Institute of Technology RoorkeeRoorkeeHaridwarUttarakhand 247667India Department of Solar Energy School of TechnologyPandit Deendayal Energy UniversityGandhinagar 382007GujaratIndia

Development of novel materials with desirable properties remains at the forefront of modern scientific *** learning(ML),a branch of artificial intelligence,has recently emerged as a powerful technology in optoelectronic devices for the prediction of various properties and rational design of *** halide perovskites(MHPs)have been at the centre of attraction owing to their outstanding photophysical properties and rapid development in solar cell ***,the application of ML in the field of MHPs is also getting much attention to optimize the fabrication process and reduce the cost of ***,we comprehensively reviewed different applications of ML in the designing of both MHP absorber layers as well as complete perovskite solar cells(PSCs).At the end,the challenges of ML along with the possible future direction of research are *** believe that this review becomes an indispensable roadmap for optimizing materials composition and predicting design strategies in the field of perovskite technology in the future.

关键词： Machine learning Metal halide perovskites Perovskite solar cell Lead free perovskites

Ocean Chemistry Revealed by Mineralogical and Geochemical Evidence at the Permian——Triassic Mass Extinction,Offshore the Persian Gulf,Iran

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Acta Geologica Sinica(English Edition) 2016年第5期90卷 1852-1864页

作者： Vahid tavakoli School of Geology College of ScienceUniversity of Tehran

The Upper Permian Dalan Formation and the Lower Triassic Kangan Formation in the Persian Gulf area are mainly composed of shallow marine facies limestone and *** subsurface-cored intervals were investigated in order to understand the original mineralogy and paleoceanic *** decreasing trend of Sr concentration in these deposits shows that aragonite was precipitated during the Late Permian and then gradually changed to calcite toward the Permian-Triassic boundary（PTB）.The dissolution rate of aragonite decreased from 60 m below the PTB toward the boundary,with the only exception at 10 m below the Permian-Triassic Boundary（PTB） due to the Permian-Triassic unconformity in this *** increasing trend of Mg/Ca ratio in a global scale at the end-Permian time shows that the interpreted variation of mineralogy does not result from the change of this *** increasing p（CO2） and decreasing pH are considered to be the main controlling *** increase of Ca2＋ at the end-Permian time due to the input of meteoric waters is too little to fully compensate this effect.A local maximum of the Si content just at the PTB confirms the input of runoff waters.

关键词： Permian Triassic carbonate mineralogy elemental composition Iran Persian Gulf

Study of relation between the gamma flux buildup factors and source geometry by M-C simulation

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Nuclear Science and Techniques 2017年第9期28卷 31-35页

作者： Ali Rasouli Hossein tavakoli-Anbaran Faculty of Physics Shahrood University of Technology

This paper is to achieve a gamma-ray source with the lowest rate of buildup factor, which is of great importance in medical, industrial and agricultural *** flux buildup factor of gamma rays is calculated by the MCNP code for point, linear, surface and volume sources with shield layers of lead, iron and aluminum. The results show that for the high Z shielding material, the flux buildup factor of coaxial cylindrical sources is the lowest(1.6–2.3)of all sources, while for low Z shielding materials, the coaxial disk surface sources have smaller buildup factor(1.45–1.6).

关键词：通量几何模拟增强因子 γ射线源农业科学 MCNP 伽马射线