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Toward health management and enhanced efficiency in wind turbine farms: preliminary study

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Toward health management and enhanced efficiency in wind tur...

The newly-assisted catalytic mechanism of surface hydroxyl species performed as the promoter in syngas-to-C2 species on the Cu-based bimetallic catalysts

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作者： Bharath Nayak M. Stefanovic the Department of Electrical and Computer Engineering University of Wyoming Laramie WY 82071 USA

Wind farms are locally concentrated clusters of wind turbines that are electrically and commercially tied together. The benefits of wind farms （reducing the average cost due to increasing returns of scale） may become counteracted by the aerodynamic interaction among turbines, which can decrease the total captured energy convertible to electricity. Current utility-scale wind farms include systems for controlling individual turbines and displaying information on the wind farm operation （SCADA）. In other various engineering disciplines, novel research into prognostics and diagnostics algorithms is being extensively conducted [4]. The current research interest is extrapolation of these methods to composite blades in wind turbines, and obtaining prognostics signatures in a wind turbine simulator. Correspondingly, the control settings should be changed in response to the health information on the blades, gearbox, bearing, power electronics and motors. The motivation for this work is implementation of a dis- tributed coordinated control concept that takes into account the interaction of wind turbines in a wind farm （aerodynamic coupling effect）, as well as health information on the individual blades, bearings, electronics and motors, obtained from a health management algorithm. Distributed fault tolerant control and reconfiguration, based on fault detection/health management concepts, are currently being developed.

关键词： Health management Wind turbines

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Green Energy & Environment 2023年第2期8卷 487-498页

作者： Chenyang Li Yuan Zhang Debao Li Baojun Wang Christopher K.Russell Maohong Fan Riguang Zhang State Key Laboratory of Clean and Efficient Coal Utilization Taiyuan University of TechnologyTaiyuanShanxi030024China Key Laboratory of Coal Science and Technology(Taiyuan University of Technology) Ministry of EducationChina State Key Laboratory of Coal Conversion Institute of Coal ChemistryChinese Academy of SciencesTaiyuanShanxi030001China College of Engineering and Applied Science University of WyomingLaramieWY82071USA Davidson School of Chemical Engineering Purdue UniversityWest LafayetteIN47906USA School of Civil and Environmental Engineering Georgia Institute of TechnologyAtlantaGA30332USA School of Energy Resources University of WyomingLaramieWY82071USA

In the conversion process of syngas-to-C_(2)species,the OH species are inevitably produced accompanying the production of key intermediates CH_(x)(x=1-3),traditionally,the function of surface OH species is generally accepted as the hydrogenating reactive *** work for the first time proposed and confirmed the assisted catalytic mechanism of surface OH species that performed as the promoter for syngas-to-C_(2)species on Cu-based *** and microkinetic modeling results reveal that the produced OH species accompanying the intermediates CH_(x)production on the MCu(M=Co,Fe,Rh)catalysts can stably exist to form OH/MCu catalysts,on which the presence of surface OH species as the promoter not only presented better activity and selectivity toward CH_(x)(x=1-3)compared to MCu catalysts,but also significantly suppressed CH_(3)OH production,providing enough CH_(x)sources to favor the production of C_(2)hydrocarbons and ***,the electronic properties analysis revealed the essential relationship between the electronic feature of OH/MCu catalysts and catalytic performance,attributing to the unique electronic micro-environment of the catalysts under the interaction of surface OH *** new mechanism is called as OH-assisted catalytic mechanism,which may be applied in the reaction systems related to the generation of OH species.

关键词： Syngas conversion C_(2)species Cu-based catalyst Surface OH species Assisted catalytic mechanism

Best Paper Award 2020

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Building Simulation 2022年第3期15卷 315-315页

作者： Gang Tan Department of Civil and Architectural Engineering University of WyomingLaramieWY 82071USA

I am pleased to announce that the following paper has been awarded the Best Review Paper 2020,which stands out from the review papers published by Building Simulation from 2016(Volume 9)to 2020(Volume 13):·Bert Blocken.“LES over RANS in building simulation for outdoor and indoor applications:A foregone conclusion?”Building Simulation,2018,11(5):821-870.

关键词： conclusion outdoor stands

On a Perturbation Method for Stochastic Parabolic PDE

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Communications in Mathematics and Statistics 2015年第2期3卷 215-226页

作者： Donald J.Estep Peter L.Polyakov Department of Statistics Colorado State University205 Statistics BuildingFort CollinsCO 80523USA Department of Mathematics University ofWyoming1000 EUniversityAveLaramieWY82071USA

In this article,we address two issues related to the perturbation method introduced by Zhang and Lu(J Comput Phys 194:773-794,2004),and applied to solving linear stochastic parabolic *** issues are the construction of... 详细信息

关键词： Stochastic parabolic differential equation Karhunen-Loève expansion

DNA-PKcs promotes alcohol-related liver disease by activating Drp1-related mitochondrial fission and repressing FUNDC1-required mitophagy

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Signal Transduction and Targeted Therapy 2019年第1期4卷 161-172页

作者： Hao Zhou Pingjun Zhu Jin Wang Sam Toan Jun Ren Chinese PLA General Hospital Medical School of Chinese PLA100853BeijingChina Center for Cardiovascular Research and Alternative Medicine University of Wyoming College of Health SciencesLaramieWY82071USA Department of Chemical Engineering University of Minnesota-DuluthDuluthMN55812USA

DNA-dependent protein kinase catalytic subunit(DNA-PKcs)is a novel housekeeper of hepatic mitochondrial homeostasis outside the DNA repair *** this study,DNA-PKcs was upregulated in the livers of mice that were exposed to alcohol;the expression of DNA-PKcs positively correlated with hepatic steatosis,fibrosis,apoptosis,and mitochondrial *** studies revealed that liver-specific DNA-PKcs knockout(DNA-PKcsLKO)mice were protected from chronic ethanol-induced liver injury and mitochondrial *** investigations established that DNA-PKcs promoted p53 activation,which elevated dynamin-related protein 1(Drp1)-related mitochondrial fission but repressed FUN14 domain containing 1(FUNDC1)-required *** fission and defective mitophagy triggered mtDNA damage,mitochondrial respiratory inhibition,mROS overproduction,cardiolipin oxidation,redox imbalance,calcium overload,and hepatic mitochondrial *** contrast,the deletion of DNA-PKcs rescued these phenotypic alterations,which alleviated the susceptibility of hepatocytes to alcohol-induced ***,we also showed that orphan nuclear receptor subfamily 4 group A member 1(NR4A1)was the upstream signal for DNA-PKcs activation and that the genetic ablation of NR4A1 ameliorated the progression of alcohol-related liver disease(ARLD);these results were similar to those obtained in DNA-PKcs knockout ***,our results identified the NR4A1/DNA-PKcs/p53 axis as a novel signaling pathway responsible for ARLD pathogenesis that acts by activating Drp1-related mitochondrial fission and restricting FUNDC1-required *** findings have potential implications for new approaches for ARLD therapy.

关键词： process. alcohol activation

Direct conversion of methane to methanol by electrochemical methods

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Green Energy & Environment 2022年第6期7卷 1132-1142页

作者： Haomin Jiang Luting Zhang Zhiwei Han Yang Tang Yanzhi Sun Pingyu Wan Yongmei Chen Morris D.Argyle Maohong Fan Institute of Applied Electrochemistry College of ChemistryBeijing University of Chemical TechnologyBeijing100029China Department of Chemical Engineering Brigham Young UniversityProvoUT84602USA College of Engineering and Applied Sciences School of Energy ResourcesUniversity of WyomingLaramieWY82071USA

A convenient method for methane(CH_(4))direct conversion to methanol(CH_(3)OH)is of great significance to use methane-rich resources,especially clathrates and stranded shale gas resources located in remote ***,the activation of CH_(4) and the selectivity to the CH_(3)OH product are challenging due to the extreme stability of CH_(4) and relatively high reactivity of CH_(3)*** state-of-the-art‘methane reforming-methanol synthesis’process adopts a two-step strategy to avoid the further reaction of CH_(3)OH under the harsh conditions required for CH_(4) *** the electrochemical field,researchers are trying to develop conversion pathways under mild *** have found suitable catalysts to activate the C–H bonds in methane with the help of external charge and have designed the electrode reactions to continuously generate certain active oxygen *** active oxygen species attack the activated methane and convert it to CH_(3)OH,with the benefit of avoiding over-oxidation of CH_(3)OH,and thus obtain a high conversion efficiency of CH_(4) to CH_(3)*** mini-review focuses on the advantages and challenges of electrochemical conversion of CH4 to CH_(3)OH,especially the strategies for supplying electro-generated active oxygen species in-situ to react with the activated methane.

关键词： Methane Methanol Direct conversion Electrochemical methods Active oxygen species

Automating adjoint wave-equation travel-time tomography using scientific workflow

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Earthquake Science 2013年第5期26卷 331-339页

作者： Xiaofeng Zhang Po Chen Satish Pullammanappallil Department of Geology and Geophysics University of WyomingLaramie WY 82071 USA Optim Software and Data Solutions LLC 200 S. Virginia St.Suite 560 Reno NV 89501 USA

Abstract Recent advances in commodity high-performance computing technology have dramatically reduced the computational cost for solving the seismic wave equation in complex earth structure models. As a consequence, wave-equation-based seismic tomography techniques are being actively developed and gradually adopted in routine subsurface seismic imaging practices. Wave-equation travel-time tomography is a seismic tomography technique that inverts cross-correlation travel-time misfits using fullwave Frechet kernels computed by solving the wave equation. This technique can be implemented very efficiently using the adjoint method, in which the misfits are back-propagated from the receivers （i.e., seismometers） to produce the adjoint wave-field and the interaction between the adjoint wave-field and the forward wave-field from the seismic source gives the gradient of the objective function. Once the gradient is available, a gradient-based optimization algorithm can then be adopted to produce an optimal earth structure model that minimizes the objective function. This methodology is conceptually straightforward, but its implementation in practical situations is highly complex, error-prone and computationally demanding. In this study, we demonstrate the feasibility of automating wave-equation travel-time tomography based on the adjoint method using Kepler, an open-source software package for designing, managing and executing scientific workflows. The workflow technology allows us to abstract away much of the complexity involved in the implementation in a manner that is both robust and scalable. Our automated adjoint wave-equation travel-time tomography package has been successfully applied on a real active-source seismic dataset.

关键词： Adjoint tomography Scientificworkflow Seismic inversion Kepler

Shape factor for regular and irregular matrix blocks in fractured porous media

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Petroleum Science 2020年第1期17卷 136-152页

作者： Peyman Rostami Mohammad Sharifi Morteza Dejam Department of Petroleum Engineering Amirkabir University of Technology(Polytechnic of Tehran)Hafez AvenueP.O.Box 15875-4413TehranIran Department of Petroleum Engineering College of Engineering and Applied ScienceUniversity of Wyoming1000 E.University AvenueLaramieWY 82071-2000USA

Describing matrix–fracture interaction is one of the most important factors for modeling natural fractured reservoirs.A common approach for simulation of naturally fractured reservoirs is dual-porosity modeling where the degree of communication between the low-permeability medium(matrix)and high-permeability medium(fracture)is usually determined by a transfer *** of the proposed matrix–fracture functions depend on the geometry of the matrix and fractures that are lumped to a factor called shape ***,there is no unique solution for calculating the shape factor even for symmetric *** fine-scale modeling is a tool for calculating the shape factor and validating the current solutions in the *** this study,the shape factor is calculated based on the numerical simulation of fine-grid simulations for single-phase flow using finite element *** the best of the author’s knowledge,this is the first study to calculate the shape factors for multidimensional irregular bodies in a systematic *** models were used,and shape factors were calculated for both transient and pseudo-steady-state(PSS)cases,although in some cases they were not clarified and assumptions were not *** boundary condition dependency of the shape factor was also investigated,and the obtained results were compared with the results of other *** show that some of the most popular formulas cannot capture the exact physics of matrix–fracture *** obtained results also show that both PSS and transient approaches for describing matrix–fracture transfer lead to constant shape factors that are not unique and depend on the fracture pressure(boundary condition)and how it changes with time.

关键词： Fractured reservoirs Shape factor Matrix–fracture boundary conditions Computational fluid dynamic(CFD)

Application of percarbonate and peroxymonocarbonate in decontamination technologies

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Journal of Environmental Sciences 2021年第7期33卷 100-115页

作者： Bo-Tao Zhang Lulu Kuang Yanguo Teng Maohong Fan Yan Ma College of Water Sciences Beijing Normal UniversityBeijing 100875China Engineering Research Center of Groundwater Pollution Control and Remediation Ministry of EducationBeijing 100875China Department of Chemical and Petroleum Engineering University of WyomingLaramieWY 82071United States School of Chemical and Environmental Engineering China University of Mining and Technology(Beijing)Beijing 100083China

Sodium percarbonate(SPC)and peroxymonocarbonate(PMC)have been widely used in modified Fenton reactions because of their multiple superior features,such as a wide pH range and environmental *** broad review is intended to provide the fundamental information,status and progress of SPC and PMC based decontamination technologies according to the peer-reviewed papers in the last two *** SPC and PMC can directly decompose various *** degradation efficiency will be enhanced and the target contaminants will be expanded after the activation of SPC and *** most commonly used catalysts for SPC activation are iron compounds while cobalt composi-tions are applied to activate PMC in homogenous and heterogeneous catalytical *** generation and participation of hydroxyl,superoxide and/or carbonate radicals are involved in the activated SPC and PMC *** reductive radicals,such as carbon dioxide and hydroxyethyl radicals,can be generated when formic acid or methanol is added in the Fe(II)/SPC system,which can reduce target *** can also be activated by energy,tetraacetylethylenediamine,ozone and buffered alkaline to generate different reactive radicals for pollutant *** SPC and activated SPC have been assessed for application in-situ chemical oxidation and sludge dewatering *** challenges and prospects of SPC and PMC based decontamination technologies are also addressed in the last section.

关键词： Sodium percarbonate Peroxymonocarbonate Activation Radical Decontamination technologies