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Improving low-voltage ride-through capability of a multimegawatt DFIG based wind turbine under grid faults

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Protection and Control of Modern Power Systems 2020年第1期5卷 390-402页

作者： Mohamed Nadour Ahmed Essadki Tamou Nasser research center of engineering and health Science and technologies(STIS) High Normal School of Technical Education(ENSET)Mohammed V UniversityRabatMorocco research center of engineering and health Science and technologies Higher National School of Computer Science and Systems Analysis(ENSIAS)Mohammed V UniversityRabatMorocco

Large integration of doubly-fed induction generator(DFIG)based wind turbines(WTs)into power networks can have significant consequences for power system operation and the quality of the energy supplied due to their excessive sensitivity towards grid *** voltage dips,the resulting overcurrent and overvoltage in the rotor circuit and the DC link of a DFIG,could lead to the activation of the protection system and WT *** potentially results in sudden loss of several tens/hundreds of MWs of energy,and consequently intensifying the severity of the *** paper aims to combine the use of a crowbar protection circuit and a robust backstepping control strategy that takes into consideration of the dynamics of the magnetic flux,to improve DFIG’s Low-Voltage Ride Through capability and fulfill the latest grid code *** the power electronic interfaces are protected,the WTs also provide large reactive power during the fault to assist system voltage *** results using Matlab/Simulink demonstrate the effectiveness of the proposed strategy in terms of dynamic response and robustness against parametric variations.

关键词： Wind turbine DFIG Grid faults Crowbar protection Backstepping control Low-voltage ride through

Long term exposure to ambient air particulate matter and mortality effects in Megacity of Tehran,Iran:2012-2017

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Particuology 2021年第5期19卷 139-146页

作者： Mehdi Fazlzadeh Roohollah Rostami Fatemeh Yousefian Masud Yunesian Hosna Janjani Social Determinants of health research center Ardabil University of Medical SciencesArdabilIran research center for health sciences and technologies Semnan University of Medical SciencesSemnanIran Department of Environmental health engineering School of Public HealthTehran University of Medical SciencesTehranIran Department of research Methodology and Data Analysis Institute for Environmental ResearchTehran University of Medical SciencesTehranIran

Ambient particulate matter(PM)is the major environmental concern in Tehran,*** to such particles is a serious global health concern and substantial evidence indicates that exposure to particulate matter contributes to cardiovascular and respiratory ***,we provide a detailed health impact of ambient air pollution in Tehran by linking PM pollution with mortality caused by cardiovascular and respiratory *** quality data of PM obtained from Tehran Air Quality Monitoring Stations(TAQMSs)during 2012–*** mining methods conducted by Spatio-temporal outlier detection and“Air Pollution and health:a European Approach(APHEA)project”was applied to impute missing ***-series data were analyzed to estimate the associations between PM pollution and cause-specific mortality at different lags in *** on descriptive analysis,PM_(2.5) is expected to be a major influencing factor in the increased cardiovascular-related death(CVD)and respiratory dysfunction related death(RD)*** cross-correlation analysis showed the same source for PM_(2.5) and PM_(10) in the ambient air of ***,the results indicated delays of about 7-15 days from the increased concentrations of PMs and the observed rising in CVD and RD *** analysis showed a more decreasing trend for PM_(2.5) pollutions than PM_(10) pollution and a slightly increasing trend for cause-specific deaths during *** term exposure to high PM levels increases the CVD and RD deaths and control strategies along with control regulations should be considered to control PM.

关键词： Air pollution Particulate matter Cardiovascular related death Respiratory dysfunction related death Tehran

Enhanced removal of benzene in nonthermal plasma with ozonation, flow recycling, and flow recirculation

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Plasma Science and Technology 2019年第9期21卷 91-100页

作者： Roohollah ROSTAMI Gholamreza MOUSSAVI Sara DARBARI Ahmad JONIDI JAFARI research center for health sciences and technologies Semnan University of Medical Sciences Semnan *** Iran Department of Environmental health engineering Faculty of Medical Sciences Tarbiat Modares University Tehran *** Iran ECE Department Tarbiat Modares University Tehran *** Iran Department of Environmental health engineering Faculty of Health Iran University of Medical Sciences Tehran *** Iran

A double stage AC/DC sequential high voltage reactor has been developed to study the decomposition of benzene in the air stream at atmospheric pressure. The removal efficiency was measured as a function of ozonation, flow recycling, and flow recirculation. Ozonation in the inlet, and recycling of the exhaust stream increased the removal of benzene, also with increasing of specific input energy(J l^-1) the effect of inlet flow ozonation on benzene decomposition was enhanced. The highest removal efficiency was obtained up to >99% in recirculation six times,while CO2 selectivity reached 99.9% and energy efficiency was 0.59 g kWh^-1. O3 production/decomposition > production of OH radicals > electronic and ionic collisions were indicated as the main mechanisms influencing benzene abatement in this research.

关键词： plasma benzene positive corona air pollution

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Overview of in-situ oxygen production technologies for lunar resources

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International Journal of Minerals,Metallurgy and Materials 2025年第02期 233-255页

作者： Youpeng Xu Sheng Pang Liangwei Cong Guoyu Qian Dong Wang Laishi Li Yusheng Wu Zhi Wang College of Materials Science and engineering Shenyang University of Technology CAS Key Laboratory of Green Process and engineering National Engineering Research Center for Green Recycling of Strategic Metal ResourcesInstitute of Process EngineeringChinese Academy of Sciences Innovation Academy for Green Manufacture Chinese Academy of Sciences School of Chemical engineering University of Chinese Academy of Sciences

The rich resources and unique environment of the Moon make it an ideal location for human expansion and the utilization of extraterrestrial resources. Oxygen, crucial for supporting human life on the Moon, can be extracted from lunar regolith, which is highly rich in oxygen and contains polymetallic oxides. This oxygen and metal extraction can be achieved using existing metallurgical techniques. Furthermore, the ample reserves of water ice on the Moon offer another means for oxygen production. This paper offers a detailed overview of the leading technologies for achieving oxygen production on the Moon, drawing from an analysis of lunar resources and environmental conditions. It delves into the principles, processes, advantages, and drawbacks of water-ice electrolysis, two-step oxygen production from lunar regolith, and one-step oxygen production from lunar regolith. The two-step methods involve hydrogen reduction, carbothermal reduction, and hydrometallurgy, while the one-step methods encompass fluorination/chlorination, high-temperature decomposition, molten salt electrolysis, and molten regolith electrolysis(MOE). Following a thorough comparison of raw materials, equipment, technology, and economic viability, MOE is identified as the most promising approach for future in-situ oxygen production on the Moon. Considering the corrosion characteristics of molten lunar regolith at high temperatures, along with the Moon's low-gravity environment, the development of inexpensive and stable inert anodes and electrolysis devices that can easily collect oxygen is critical for promoting MOE technology on the Moon. This review significantly contributes to our understanding of in-situ oxygen production technologies on the Moon and supports upcoming lunar exploration initiatives.

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Potential dependence in electrocatalysis: a theoretical perspective

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Science China Chemistry 2025年第01期 21-25页

作者： Leyu Liu Zhaoming Xia Zeyu Wang Yinjuan Chen Hai Xiao Department of Chemistry Tsinghua University Fundamental Science center of Rare Earths Ganjiang Innovation Academy Chinese Academy of Sciences Key Laboratory of Advanced Catalytic Materials and Technology Advanced Catalysis and Green Manufacturing Collaborative Innovation Center Changzhou University

Electrocatalysis is a key technology for the new energy era and sustainable development, serving as the interface for interconversion of electrical and chemical energies, which spans a wide spectrum of applications in sustainable energy and environmental engineering. Electrocatalytic reactions including electrochemical CO2reduction reaction （eCO2RR）, hydrogen evolution reaction （HER）, and oxygen evolution/reduction reactions （OER/ORR）, hold essential promise for renewable energy technologies as well as complement the biogeochemical carbon and oxygen cycles.

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Gelatin-based hydrogel functionalized with taurinemoieties for in vivo skin tissue regeneration

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Bio-Design and Manufacturing 2023年第3期6卷 284-297页

作者： Farnaz Rahimi Nima Ahmadkhani Aida Goodarzi Fariba Noori Sajad Hassanzadeh Sepideh Saghati Mehdi Khanmohammadi Arash Goodarzi Department of Tissue engineering School of Advanced Technologies in MedicineFasa University of Medical ScienceFasaIran School of Chemical Biological and Environmental EngineeringOregon State UniversityCorvallisOR 97331USA Eye research center School of MedicineThe Five Senses Health InstituteIran University of Medical SciencesTehranIran Skull Base research center School of MedicineThe Five Senses Health InstituteIran University of Medical SciencesTehranIran Department of Tissue engineering Faculty of Advanced Medical SciencesTabriz University of Medical SciencesTabrizIran

Functionalized hydrogels stimulate the migration and morphogenesis of endothelial cells(ECs)and are useful substrates for wound *** present study investigates the feasibility of covalent conjugation of taurine(Tau)on a gelatin-based *** hydrogel is expected to maintain positive charged growth factors such as basic fibroblast growth factor(bFGF)and vascular endothelial growth factors(VEGFs)near ECs within the hydrogel *** gelatin was conjugated with hydroxyl phenol(Ph)and Tau moieties,and in following that Ph residues were crosslinked through a horseradish peroxidase-catalyzed *** migration characteristics of ECs were analyzed by scratch migration assay and microparticle-based cell migration *** morphology and amounts of angiopoietin 1(Ang 1),bFGF,and VEGF proteins were evaluated for encapsulated *** potential of synthesized hydrogels in wound healing was assessed by the percentage of reduction from the original wound size and histopathological analyses of rat *** incorporated Tau molecules within the hydrogel remained stable through covalent bonds during *** extended incubation,the gelatin-based hydrogel conjugated with Tau improved the migration distance and number of existing migrated *** Tau within the gelatin-based hydrogel induced high motility of ECs,accompanied by robust cytoskeleton extension and a cell subpopulation that expressed CD44 and CD31 receptors as well as enhancement of Ang 1,bFGF,and *** found that injectable Gel-Ph-Tau effectively improves wound-healing parameters.

关键词： Taurine conjugation Covalent crosslinking Immobilization of growth factors Gelatin-based hydrogel Endothelial cells

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Particle agglomeration and interphase interactions affect Young’s modulus of nanobiocomposites:eyes at mathematical modeling

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Acta Mechanica Sinica 2024年第9期40卷 10-21页

作者： Pooriya Sarrami Mohammad Rafienia Saeed Karbasi Student research Committee School of Advanced Technologies in MedicineIsfahan University of Medical SciencesIsfahan 81746-73461Iran Biosensor research center Isfahan University of Medical SciencesIsfahan 81746-73461Iran Department of Biomaterials Nanotechnology and Tissue EngineeringSchool of Advanced Technologies in MedicineIsfahan University of Medical SciencesIsfahan 81746-73461Iran

Computational modeling is a new approach to optimize Young’s modulus of scaffolds by performing a minimal number of ***,presenting a modeling algorithm to predict Young’s modulus and characterize the governing parameters is a challenging ***,a novel modeling approach has been proposed to estimate Young’s modulus of scaffolds,considering particle agglomeration and interphase *** the characteristic parameters of these two phenomena,we modified the Maxwell model using a simple three-step algorithm to determine the optimal value of these parameters and predict Young’s ***,the model provides a precision of more than 95%for all the studied cases and presents a remarkably better performance compared to the two other *** instance,the proposed model has reduced the average absolute relative error of Young’s modulus of poly(3-hydroxybutyrate)-keratin/hydroxyapatite nanorods from 25.1%to 0.08%,demonstrating the high efficiency of this model in predicting Young’s modulus of *** results of this study could lighten the way of fabricating nanobiocomposites with optimal mechanical properties,spending lower cost and energy.

关键词： Predictive models Mechanical properties Polymer nanocomposites Particle agglomeration Bone tissue engineering

Blockchain-based vehicular edge computing networks: the communication perspective

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Science China(Information sciences) 2023年第7期66卷 253-265页

作者： Lin HE Fuchang LI Haikun XU Wenbo XIA Xuefei ZHANG Xiaofeng TAO research Institute China United Network Communications Corporation Limited National engineering research center of Mobile Network technologies Beijing University of Posts and Telecommunications

Vehicular edge computing(VEC) networks can satisfy the increasing demands of data processing by offloading the computation tasks to multiple distributed edge computing nodes assisted by servers. These edge servers generally combine with roadside units(RSUs). However, RSUs with edge servers cannot be fully trusted, possibly leading to serious security and privacy problems. Combining blockchain with VEC networks may establish a trusted and decentralized vehicular environment, but the coexistence of multiple communication modes comprising vehicle-to-vehicle(V2V), vehicle-to-RSU(V2R), and RSU-to-RSU(R2R) makes the block propagation patterns have different effects on the block consensus process. In this paper, we study the block propagation patterns between vehicles and RSUs with edge servers under three communication *** first give the closed-form expressions for the single-block and multiblock propagation times in two specific conditions to explore how the priority of a block generated from a specific node affects the block propagation process, in which multiblock propagation embodies competitive propagation due to blockchain ***, an innovative consensus mechanism that fully invokes the communication capability of the nodes is proposed, and the block propagation time and frequency can be substantially reduced under this *** addition, an important finding is that under the conventional and proposed consensus mechanisms, an RSU or a vehicle that creates a new block plays a decisive role in the block propagation pattern.

关键词： block propagation blockchain consensus VEC network

Use of inverse stability solutions for identification of uncertainties in the dynamics of machining processes

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Advances in Manufacturing 2018年第3期6卷 308-318页

作者： Lutfi Taner Tunc Orkun Ozsahin Integrated Manufacturing technologies research and Application center Faculty of Engineering and Natural Sciences Sabanci University 34956 Tuzla Istanbul Turkey Department of Mechanical engineering Middle East Technical University Ankara Turkey

research on dynamics and stability of machin-ing operations has attracted considerable attention. Cur-rently, most studies focus on the forward solution ofdynamics and stability in which material properties and thefrequency response function at the tool tip are known topredict stable cutting conditions. However, the forwardsolution may fail to perform accurately in cases whereinthe aforementioned information is partially known or var-ies based on the process conditions, or could involve sev-eral uncertainties in the dynamics. Under thesecircumstances, inverse stability solutions are immenselyuseful to identify the amount of variation in the effectivedamping or stiffness acting on the machining system. Inthis paper, the inverse stability solutions and their use forsuch purposes are discussed through relevant examples andcase studies. Specific areas include identification of processdamping at low cutting speeds and variations in spindledynamics at high rotational speeds.

关键词： Inverse stability Machining dynamics Highspeed milling Process damping Spindle dynamics