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Switchable Capacitor Bank Coordination and Dynamic Network Reconfiguration for Improving Operation of Distribution Network Integrated with Renewable Energy Resources

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Journal of Modern Power Systems and Clean Energy 2022年第3期10卷 637-646页

作者： ramin Borjali Navesi Darioush Nazarpour Reza Ghanizadeh Payam Alemi Department of Electrical Engineering Islamic Azad UniversityUrmia BranchUrmiaIran Faculty of Electrical and Computer Engineering Urmia UniversityUrmiaIran

Point of common coupling(PCC)arrays are the most prominent and widely-used intermittent distributed generations(DGs).Due to the right-of-way,environmental,economical and other restrictions,the connection of these types of DGs to the preferred point of the distribution network is very difficult or impossible in some ***,because of non-optimal locations,they may cause a voltage rise at the *** this paper,a coordinated design of switchable capacitor banks(SCBs)with dynamic reconfiguration of the distribution network is proposed to avoid low-and high-voltage *** distribution network reconfiguration is implemented to mitigate the voltage rise at PCCs and capacitor banks(CBs)to solve the low-voltage problem.A novel method is presented for determining the optimal size of *** proposed capacitor sizing method(CSM)effectively determines the optimal values of reactive power for the given *** optimal locations of SCB are determined using particle swarm optimization *** 24-hour reactive power curve optimized by the proposed method plays a pivotal role in designing *** simulation results show that the implementation of the dynamic network reconfiguration and the placement of SCB is required to maintain a standard voltage profile for better employment of DG embedded distribution networks.

关键词： Capacitor placement distributed generation(DG) non-linear load dynamic reconfiguration switchable capacitor

Thermo economic evaluation of oxy fuel combustion cycle in Kazeroon power plant considering enhanced oil recovery revenues

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Journal of Central South University 2014年第3期21卷 1025-1033页

作者： Ehsan Torabnejad ramin Haghighi-Khoshkhoo Niloufar Sarabchi Research & Development Office MONENCO Iran Consulting Engineers Faculty of Mechanic and Energy Engineering Shahid Beheshti University Faculty of Mechanical Engineering University of Tabriz

Oxy fuel combustion and conventional cycle(currently working cycle) in Kazeroon plant are modeled using commercial thermodynamic modeling software. Economic evaluation of the two models regarding the resources of transport and injection of carbon dioxide into oil fields at Gachsaran for enhanced oil recovery in the various oil price indices is conducted and indices net present value(NPV) and internal rate of return on investment(IRR) are calculated. The results of the two models reveal that gross efficiency of the oxy fuel cycle is more than reference cycle(62% compared to 49.03%), but the net efficiency is less(41.85% compared to 47.92%) because of the high-energy consumption of the components, particularly air separation unit(ASU) in the oxy fuel cycle. In this model, pure carbon dioxide with pressure of 20×105 Pa and purity of 96.84% was captured. NOX emissions also decrease by 4289.7 tons per year due to separation of nitrogen in ASU. In this model, none of the components of oxy fuel cycle is a major engineering challenge. With increasing oil price, economic justification of oxy fuel combustion model increases. With the price of oil at $ 80 per barrel in mind and $ 31 per ton fines for emissions of carbon dioxide in the atmosphere, IRR is the same for both models.

关键词： oxy fuel combustion: C02 capture combined cycle enhanced oil recovery NOx reduction

Single-cell analysis of tumors:Creating new value for molecular biomarker discovery of cancer stem cells and tumor-infiltrating immune cells

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World Journal of Stem Cells 2018年第11期10卷 160-171页

作者： ramin Radpour Farzad Forouharkhou Tumor Immunology Department for Bio-Medical Research (DBMR) University of Bern Bern 3008 Switzerland Department of Medical Oncology Inselspi-tal Bern University Hospital University of Bern Bern 3008 Switzerland

Biomarker-driven individualized treatment in oncology has made tremendous progress through technological developments, new therapeutic modalities and a deeper understanding of the molecular biology for tumors, cancer stem cells and tumor-infltrating immune cells. Recent technical developments have led to the establi-shment of a variety of cancer-related diagnostic, progno-stic and predictive biomarkers. In this regard, different modern OMICs approaches were assessed in order to categorize and classify prognostically different forms of neoplasia. Despite those technical advancements, the extent of molecular heterogeneity at the individual cell level in human tumors remains largely *** tumor consists of a mixture of heterogeneous cell types. Therefore, it is important to quantify the dynamic cellular variations in order to predict clinical parameters, such as a response to treatment and or potential for disease recurrence. Recently, single-cell based methods have been developed to characterize the heterogeneity in seemingly homogenous cancer cell populations prior to and during treatment. In this review, we highlight the recent advances for single-cell analysis and discuss the challenges and prospects for molecular characterization of cancer cells, cancer stem cells and tumor-infltrating immune cells.

关键词： Cancer cells Cancer stem cells Cancer biomarkers Tumor-infltrating lymphocytes Single-cell analysis

Inter-regulatory role of microRNAs in interaction between viruses and stem cells

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World Journal of Stem Cells 2021年第8期13卷 985-1004页

作者： Afsoon Afshari ramin Yaghobi Ghazal Rezaei Shiraz Nephro-Urology Research Center Shiraz University of Medical SciencesShiraz ***Iran Shiraz Transplant Research Center Shiraz University of Medical SciencesShiraz ***Iran

MicroRNAs(miRNAs)are well known for post-transcriptional regulatory ability over specific mRNA *** exhibit temporal or tissue-specific expression patterns and regulate the cell and tissue developmental *** also have determinative roles in production and differentiation of multiple lineages of stem cells and might have therapeutic *** are a part of some viruses’regulatory machinery,not a *** trace of miRNAs was detected in the genomes of viruses and regulation of cell reprograming and viral *** of inter-regulatory systems has been detected for miRNAs during viral infections in stem *** between viruses and stem cells may be helpful in therapeutic tactics,pathogenesis,controlling viral infections and defining stem cell developmental strategies that is programmed by miRNAs as a ***,in this review we intended to study the interregulatory role of miRNAs in the interaction between viruses and stem cells and tried to explain the advantages of miRNA regulatory potentials,which make a new landscape for future studies.

关键词： MicroRNAs Viruses Stem cells Regulatory

Modeling of the Shale Volume in the Hendijan Oil Field Using Seismic Attributes and Artificial Neural Networks

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Acta Geologica Sinica(English Edition) 2021年第4期95卷 1322-1331页

作者： Mahdi TAHERI Ali Asghar CIABEGHODSI ramin NIKROUZ Ali KADKHODAIE Seismology Geophysics Urmia UniversityUrmiaIran Department of Geology Faculty of SciencesUrmia UniversityUrmiaIran Earth Sciences Department Faculty of Natural SciencesTabriz UniversityTabrizIran

Petrophysical properties have played an important and definitive role in the study of oil and gas reservoirs,necessitating that diverse kinds of information are used to infer these *** this study,the seismic data related to the Hendijan oil field were utilised,along with the available logs of 7 wells of this field,in order to use the extracted relationships between seismic attributes and the values of the shale volume in the wells to estimate the shale volume in wells *** the overall survey of data,a seismic line was selected and seismic inversion methods(model-based,band limited and sparse spike inversion)were applied to *** all of these techniques,the model-based method presented the better *** using seismic attributes and artificial neural networks,the shale volume was then estimated using three types of neural networks,namely the probabilistic neural network(PNN),multi-layer feed-forward network(MLFN)and radial basic function network(RBFN).

关键词： seismic inversion seismic attributes artificial neural network and shale volume Hendijan oil field

Propane-1,2,3-triyl tris(hydrogen sulfate): A mild and efficient recyclable catalyst for the synthesis of biscoumarin derivatives in water and solvent-free conditions

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Chinese Chemical Letters 2014年第1期25卷 183-186页

作者： ramin Rezaei Fatemeh Moezzi Mohammad Mahdi Doroodmand Department of Chemistry Firoozabad BranchIslamic Azad University Department of Chemistry College of Sciences& Nanotechnology Research CenterShiraz University

A simple, efficient, and ecofriendly procedure has been developed using propane-l,2,3-triyl tris（hydrogen sulfate） as a catalyst for the synthesis of biscoumarin derivatives in water and solvent-free conditions. The significant features of the present protocol are simplicity, environmentally benign, high yields, no chromatographic separation, and recyclability of the catalyst.

关键词： Biscoumarin Aldehyde4-Hydroxycoumarin Propane-1 2 3-triyl tris(hydrogen sulfate)Homogeneous catalyst

Mechanical Properties of Al/BN Nanocomposites Fabricated by Planetary Ball Milling and Conventional Hot Extrusion

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Acta Metallurgica Sinica(English Letters) 2018年第3期31卷 245-253页

作者： Reza Gostariani ramin Ebrahimi Mohsen Asadi Asadabad Mohammad Hossein Paydar Department of Materials Science and Engineering School of Engineering Shiraz University Materials and Nuclear Fuel Research School Nuclear Science and Technology Research InstituteTehran Iran

In this study,Al matrix nanocomposites containing 1,2 and 4 wt% nano-boron nitride were fabricated by mechanical milling and hot *** mechanical properties of all extruded samples were ***,the morphology and microstructure of the milled composite powders were characterized using two types of electron *** results showed that a high fraction of the boron nitride nanoparticles dissolved and formed a solid solution in Al matrix during the milling *** the process of solid solution formation,the work hardening rate of the composite powders *** led to a morphological change in the composite powders and resulted in equiaxed *** powder particle size also decreased after the milling *** increasing boron nitride content within a range of 0--4 wt% in the hot extruded samples,tensile stress increased from 212 to 333 *** hardness of the nanocomposite samples including 1,2 and 4 wt% boron nitride improved approximately 55,70 and 90% in comparison with pure Al,respectively.

关键词： Al/BN nanocomposite Planetary ball milling Hot extrusion Mechanical properties Microstructure

Effect of different sol-gel synthesis processes on microstructural and morphological characteristics of hydroxyapatite-bioactive glass composite nanopowders

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Journal of Advanced Ceramics 2014年第3期3卷 207-214页

作者： Mohamadhassan TAHERIAN ramin ROJAEE Mohammadhossein FATHI Morteza TAMIZIFAR Department of Materials and Metallurgical Engineering Iran University of Science and Technology(IUST)Tehran 16866-13114Iran Biomaterials Research Group Department of Materials EngineeringIsfahan University of TechnologyIsfahan 84156-83111Iran Dental Materials Research Center Isfahan University of Medical SciencesIsfahanIran

The aim of this work was to study the influence of the different synthesis processes on microstructural and morphological characteristics and distribution of hydroxyapatite-bioactive glass(HAp-BG)composite nanopowders obtained by sol-gel ***-BG composite nanopowders with 20 wt%bioactive glass were prepared using a sol-gel method via four routes:(I)mixing the prepared HAp solution with BG solution before aging time;(II)mixing the prepared BG solution with the prepared HAp gel after gelation;(III)mixing the calcined BG nanopowders with the prepared HAp solution;and(IV)mixing the two prepared calcined nanopowders by mechanochemical *** prepared nanopowders were evaluated and studied by X-ray diffraction(XRD),scanning electron microscopy(SEM),energy dispersive X-ray spectrometer(EDS),Fourier transform infrared(FTIR),transmission electron diffraction(TEM)and Brunauer-Emmet-Teller(BET)method to investigate the phase structure,microstructure and morphology,functional groups,and the size and distribution of *** indicated that morphology,crystallinity,crystallite size and specific surface area(SSA)of the powders are highly correspondent to the process and type of synthesis *** findings suggest that the modified sol-gel derived HAp-BG composite nanopowders are expected to efficiently provide a possibility to produce a good candidate to use for fabrication of a bulk nanostructured HAp-BG composite for bone tissue engineering.

关键词： hydroxyapatite(HAp) bioactive glass(BG) composite nanopowders sol-gel

CFD modeling of catalyst pellet for oxidative coupling of methane:Heat transfer and reaction

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Particuology 2013年第5期11卷 506-513页

作者： ramin Maghrebi Nakisa Yaghobi Siavash Seyednejadian Mitra H.Tabatabaei Department of Chemical Engineering South-Tehran Branch.Islamic Azad UniversityP.O.Box 11365/4435.TehranIran Iran Polymer and Petrochemical Institute P.O.Box 14965/115Tehran.Iran

This study deals with the phenomena occuring at single-pellet catalyst scale for the oxidative coupling of methane where heat transfer plays an important role. Computational fluid dynamics （CFD） is used for obtaining detailed rate and temperature profiles through the porous catalytic pellet where reaction and diffusion compete, lntra-particle temperature and concentration gradients were taken into account by solving heat transfer coupled with continuity equations in the catalyst pellet. In heat transfer, the energy term due to highly exothermic reaction was considered. Two external programs were successfully implemented into the CFD-code as kinetic and heat of reaction terms. Simulation results showed that reaction was favored at the beginning for the pellet, followed by diffusion predomination. The results of CFD simulation indicate that temperature variation within the catalyst pellet is 〈2 K due to exothermic oxidation. The results showed further that exothermic oxidation reactions occurred prior to endothermic coupling reaction in the pellet.

关键词： Catalyst pelletOxidative coupling of methaneModelingCFDKinetics