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Sensitivity Analysis of Pollutants and Pattern Factor in a Gas Turbine Model Combustor due to Changes in Stabilizing Jets Characteristics

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Journal of Thermal Science 2022年第5期31卷 1622-1641页

作者： BAZDIDI-TEHRANI Farzad TEYMOORI Alireza GHIYASI mehdi School of Mechanical Engineering Iran University of Science and TechnologyTehran16846-13114Iran

In the present paper,a sensitivity analysis of pollutants and pattern factor in a model combustor due to changes in the geometrical characteristics of stabilizing jets has been carried *** exhaust pollutants including NO_(x),CO and soot have been chosen due to their harmful effect on the *** pattern factor has been also considered owing to its impact on turbine *** geometrical characteristics comprise diameter,angle and position of stabilizing ***-Lagrangian approach has been employed to model liquid fuel injection and distribution,breakup and evaporation of *** the analysis of reactive-spray flow characteristics,RANS approach,realizable k-εturbulence model,discrete ordinates radiative heat transfer model and steady flamelet combustion model together with the chemical reaction mechanism of diesel fuel(C_(10)H_(22))have been ***_(x) modeling has been performed via *** analysis is such that by making variations in the problem inputs(diameter,angle and position of jets)in an organized manner,the effects on the outputs(NO_(x),CO,soot and pattern factor)are *** number and order of simulations are predicted by design of experiments and full factorial *** have been analyzed using analysis of *** has been observed that if interactions among the characteristics of jets are considered,it is possible to analyze the exhaust pollutants more *** fact,by using the interactions,it is likely to find a point where all output parameters are *** show that by considering interactions of stabilizing jet characteristics,the maximum values of NO_(x),CO,soot and pattern factor change from 13.927 ppm,11.198%mole fraction,2.877 ppm and 0.043 to 26.233 ppm,14.693%mole fraction,142.357 ppm and 0.060,***,the minimum values change from 5.819 ppm,7.568%mole fraction,0.013 ppm and 0.029 to 6.098 ppm,5.987%mole fraction,0.002 ppm and 0.027,respectively.

关键词： model jet-stabilized combustor liquid fuel injection sensitivity analysis design of experiments pollutants pattern factor

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Fabrication and Characterization of Willemite Scaffolds Using Corn Stalk as a Novel Bio Template for Bone Tissue Engineering Applications

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Journal of Bionic Engineering 2023年第1期20卷 16-29页

作者： Zahra Yahay Seyed mehdi Mirhadi Fariborz Tavangarian Department of Cellular Biotechnology Cell Science Research CenterRoyan Institute for BiotechnologyACECRIsfahan81593-58686Iran Department of Materials Engineering Shahreza BranchIslamic Azad UniversityShahrezaIsfahan86145-311Iran Mechanical Engineering Program School of ScienceEngineering and TechnologyPennsylvania State UniversityHarrisburgMiddletownPA17057USA

In this paper,we used Corn Stalk(CS)as a renewable and economical bio template to fabricate willemite scaffolds with the potential application in skull bone *** was used as a sacrificial template to synthesize the *** scaffolds with the chemical formula of Zn2SiO4 and pore size in the range of 3 to 10µm could be successfully synthesized by soaking CS in the willemite solution for 24 h and sintering at 950°C for 5 *** porosity of the samples was controlled by the soaking time(between 12 and 48 h)in the willemite solution from 5 to 35%,*** properties of these scaffolds showed a good approximation with cranial bone *** addition,cytotoxicity assays(MTT)were performed on Human Bone Marrow Stromal cells(HBMSc)and A172 human glioblastoma cell lines by direct and indirect culture methods to estimate their toxicity for bone and nerve cells,*** Phosphatase(ALP)activity and DAPI/Phalloidin cell staining were also performed to investigate the efficiency of the scaffolds for bone tissue engineering *** results showed that the scaffolds had good biocompatibility with both HBMSC and A172 cells,noticeable improvement on ALP activity,and great apatite formation ability in Simulated Body Fluid(SBF).All the evidence ascertained that willemite scaffolds made by corn stalks could be a useful candidate for bone tissue engineering applications.

关键词： Corn stalk Bio template Bioactive ceramics-Scaffolds Bone tissue engineering

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Assessment and prioritization of soil erosion triggering factors using analytical hierarchy process and Taguchi method

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International Journal of Sediment Research 2023年第3期38卷 396-404页

作者： mehdi Hayatzadeh Vahid Moosavi Ramyar Aliramaee Department of Nature Engineering Faculty of Agriculture and Natural Resources Ardakan University Department of Watershed Management Engineering Faculty of Natural Resources and Marine Sciences Tarbiat Modares University Khamsan Representative and Paired Watershed

The main aims of this study are assessing some factors which affect the soil erosion process and evaluating the results of an analytical hierarchy process(AHP) method using the Taguchi method. Firstly, the weights for those factors and levels affecting soil erosion were determined by the AHP method. The determination of weights was based on the opinions of academic researchers, experts, middle managers,and members of the Soil and Water Research Centers in Iran. Secondly, an L32 Taguchi orthogonal array was selected based on the number of factors and levels for the current problem. Accordingly, 32 rainfall events were simulated and sediment yield amounts were measured. Analyzing the results of the Taguchi method, the weights of factors and levels were determined. The results showed that the weights obtained from the AHP method were not in accordance with the results of field measurements and the Taguchi analysis. The AHP method indicated that the main factors have the following order of importance: geological formation, rainfall intensity, silt content of soil as an indicator for the soil texture,vegetation cover, slope steepness, and slope aspect in the study area. However, the Taguchi method found the following order for the main factors: rainfall intensity, geological formation, silt content of soil as an indicator for the soil texture, slope steepness, vegetation cover, and slope aspect. As the Taguchi method works based on the quantitative measurements, the Taguchi results are more reliable rather than subjective methods such as AHP. It was also concluded that the AHP method should be used cautiously in assessing natural phenomena. Therefore, in the cases that in situ measurements are possible, it is better to use quantitative mathematical and statistical methods than to rely to qualitative knowledge based approaches.

关键词： Soil erosion Taguchi method Analytical hierarchy process (AHP) method Optimization

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New Identities for Moore-Penrose Inverses of Some Operator Products and Their Reverse-order Laws

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Acta Mathematica Sinica,English Series 2023年第12期39卷 2414-2426页

作者： mehdi MOHAMMADZADEH KARIZAKI Javad FAROKHI-OSTAD Department of Computer Engineering University of Torbat HeydariehTorbat Heydarieh***Iran Department of Basic Sciences Birjand University of TechnologyBirjand***Iran

We establish new identities for Moore-Penrose inverses of some operator products,and prove their associated reverse-order ***,our results concerning the Moore-Penrose inverse of a product of two operators lead in find... 详细信息

关键词： Moore-Penrose Inverse Reverse-order Law

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A STRONG CONVERGENCE THEOREM FOR QUASI-EQUILIBRIUM PROBLEMS IN BANACH SPACES

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Acta Mathematica Scientia 2022年第1期42卷 221-232页

作者： mehdi MOHAMMADI G.Zamani ESKANDANI Department of Mathematics Payame Noor UniversityTehranIran Department of Pure Mathematics Faculty of Mathematical SciencesUniversity of TabrizTabrizIran

In this paper,we study an extragradient algorithm for approximating solutions of quasi-equilibrium problems in Banach *** prove strong convergence of the sequence generated by the extragradient method to a solution of... 详细信息

关键词： demiclosed,extragradient algorithm quasi-equilibrium problem quasiΦ-nonexpansive mapping strong convergence

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Design and performance testing of a novel building integrated photovoltaic thermal roofing panel

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Building Simulation 2023年第10期16卷 1863-1879页

作者： mehdi Zadshir Chunlin Wu Xiaokong Yu Huiming Yin Shanghai Institute of Applied Mathematics and Mechanics Shanghai Key Laboratory of Mechanics in Energy EngineeringShanghai Frontier Science Center of MechanoinformaticsSchool of Mechanics and Engineering ScienceShanghai UniversityShanghai200072China Department of Civil Engineering and Engineering Mechanics Columbia University610 Seeley W.Mudd 500 West 120th StreetNew YorkNY10027USA PVT Clean Energy LLC 7 Industry Street#5PoughkeepsieNY12603USA

A novel building integrated photovoltaic thermal(BIPVT)roofing panel has been designed considering both solar energy harvesting efficiency and thermal *** thermal system reduces the operating temperature of the cells by means of a hydronic loop integrated into the backside of the panel,thus resulting in maintaining the efficiency of the solar panels at their feasible peak while also harvesting the generated heat for use in the *** performance of the proposed system has been evaluated using physical experiments by conducting case studies to investigate the energy harvesting efficiency,thermal performance of the panel,and temperature differences of inlet/outlet working liquid with various liquid flow *** physical experiments have been simulated by coupling the finite element method(FEM)and finite volume method(FVM)for heat and mass transfer in the *** show that the thermal system successfully reduced the surface temperature of the solar module from 88℃to as low as 55℃.Accordingly,the output power that has been decreased from 14.89 W to 10.69 W can be restored by 30.2%to achieve 13.92 *** the other hand,the outlet water from this hydronic system reaches 45.4℃which can be used to partially heat domestic water ***,this system provides a versatile framework for the design and optimization of the BIPVT systems.

关键词： building integrated photovoltaic thermal panels conjugate heat transfer energy harvesting efficiency solar panels hydronic system

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The Formulation of Finite Difference RBFWENO Schemes for Hyperbolic Conservation Laws:An Alternative Technique

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Advances in Applied Mathematics and Mechanics 2023年第4期15卷 1023-1055页

作者： Rooholah Abedian mehdi Dehghan School of Engineering Science College of EngineeringUniversity of TehranIran Department of Applied Mathematics Faculty of Mathematics and Computer ScienceAmirkabir University of TechnologyNo.424Hafez Ave.TehranIran

To solve conservation laws,efficient schemes such as essentially nonoscillatory(ENO)and weighted ENO(WENO)have been introduced to control the Gibbs *** on radial basis functions(RBFs)with the classical WENO-JS weights,a new type of WENO schemes has been proposed to solve conservation laws[*** et al.,***.,70(2017),pp.551–575].The purpose of this paper is to introduce a new formulation of conservative finite difference RBFWENO schemes to solve conservation *** the usual method for reconstructing the flux functions,the flux function is generated directly with the conservative *** with Guo and Jung(2017),the main advantage of this framework is that arbitrary monotone fluxes can be employed,while in Guo and Jung(2017)only smooth flux splitting can be used to reconstruct flux *** 1D and 2D benchmark problems are prepared to demonstrate the good performance of the new scheme.

关键词： Weighted essentially non-oscillatory scheme radial basis functions interpolation ﬁnite difference method hyperbolic conservation laws

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Cx26 heterozygous mutations:role in hyperacusis and vulnerability to noise

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Signal Transduction and Targeted Therapy 2023年第8期8卷 3551-3552页

作者： Karen Tawk mehdi Abouzari Department of Otolaryngology-Head and Neck Surgery University of CaliforniaIrvineCAUSA

In a recent study published in Science Advances,Liu et *** that heterozygous deletion of connexin 26(Cx26)in mice is not harmless as they lead to hyperacusis-like hearing *** authors also found that children who carry a single-point heterozygous mutation in the gap junction(GJ)gene Cx26(GJB2)are susceptible to noise,which eventually leads to hearing loss(HL).1 HL affects millions of people worldwide and is considered the most prevalent sensory disorder,encompassing a wide range of heterogeneous characteristics.

关键词： Cx26 noise

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Proposing two new methods to decrease lateral-torsional buckling in reduced beam section connections

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Frontiers of Structural and Civil Engineering 2022年第12期16卷 1581-1598页

作者： Samira EBRAHIMI Nasrin BAKHSHAYESH EGHBALI Mohammad mehdi AHMADI School of Civil Engineering College of EngineeringUniversity of TehranTehran ***Iran Department of Civil Engineering Ilam UniversityIlam 69391-77111Iran

Reduced web section(RWS)connections can prevent lateral-torsional buckling and web local buckling experienced by reduced beam section(RBS)*** RWS connections,removing a large portion of web can result in shear demand intolerance induced to plastic hinge *** present study aims to resolve the problems of RBS and RWS connections by proposing two new connections:(1)RBS with stiffener(RBS-ST)and(2)RBS with reduced web(RW-RBS)*** the first connection(RBS-ST),a series of stiffeners is connected to the beam in the reduced flange region,while the second connection(RW-RBS)considers both a reduction in flanges and a reduction in *** beam-to-column joints with three different connections,including RBS,RBS-ST,and RW-RBS connections were considered and simulated in *** to the results,RBS-ST and RW-RBS connections can decrease or even eliminate lateral-torsional buckling and web local buckling in RBS *** is important to note that RWRBS connection is more effective in long beams with smaller shear demands in the plastic hinge ***,results showed that RBS and RW-RBS connections experienced strength degradation at 4%to 5%drift,while no strength degradation was observed in RBS-ST connection until 8%drift.

关键词： RBS RBS-ST RW-RBS lateral-torsional buckling cyclic performance

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Smart energy management system framework for population dynamics modelling and suitable energy trajectories identification in islanded micro-grids

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Energy and AI 2023年第3期13卷 104-116页

作者： mehdi Mounsif Fabien Medard Akkodis 7 Bd Henri ZieglerBlagnac31700OccitanieFrance

In an increasingly electrified and connected world,renewable energy production and robust distribution as well as sobriety paradigm,both for the individual and the society,will most likely play a central role regarding global systems ***,while being able to conceive efficient storage systems coupled with robust energy management strategies present significant interests,a number of related studies often consider the human behaviour factor *** not decisive in large industrial factories,human demeanor impact cannot be overlooked in residential *** such,this work proposes an innovative and flexible dynamic population model,inspired from epidemiological methods,that allows simulation of a vast spectrum of social *** pairing this formalization with a smart energy management strategy,a complete framework is *** particular,beyond the theoretical identification of sustainable parameters in a wide diversity of configurations,our experiments demonstrate the relevance of reinforcement learning agents as efficient energy management *** on the scenario,the trained agent enables an increase of the sustainability areas over baseline strategies up to 200%,thus hinting at ultimately softer societal impact.

关键词： Energy storage and management Reinforcement learning Population dynamics Optimization

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