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Dr. NIKOLAOS MARGARITIS
Center for Research and Technology - Hellas

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Research Keywords & Expertise

0 Hydrogen
0 pyrolysis and gasification
0 Building energy performance
0 energetic efficiency
0 District heating

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Review
Published: 22 January 2021 in Energies
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Annually, approximately 3 billion tires are commercially transacted worldwide each year and an equivalent amount is disposed of by the end of their life. Despite the increase in the life of tires and the global economic and pandemic crisis, the number of discarded tires is going to rise further due to the increasing demand for vehicles worldwide (approximately 5 billion tires by the end of 2030). The obsolete methods of tire disposal, including landfill, burning, etc., are a responsible for environmental issues (harmful substances production, air and soil pollution) and for the transmission of various diseases. Nowadays, approximately 70% of the total tires at the end of their life (ELTs) is recovered. The largest percentage of the recovered ELTs is intended for energy production or recovery as a fuel in cement industries or can be used for the production of various materials. A significant amount (approximately 95%) of the discarded ELTs can be reused. The products from the processing of ELTs can be fragments of different sizes and types, including: Trimmed rubber (70% by weight), steel wire (5–30% by weight), and fluff or textile fibers (up to 15% by weight). From the aforementioned materials, rubber and steel wires are mainly recovered and used for numerous applications. However, current ways of utilizing these materials will have to adapt or change in the near future, in order to comply with stricter regulations. The purpose of the current study is to sufficiently review recent progress on the management of ELTs, focusing on alternative uses of textile fibers such as additive for sound absorbing materials, bituminous conglomerates, concrete production, plastic materials, soil reinforcement, etc.

ACS Style

Panagiotis Grammelis; Nikolaos Margaritis; Petros Dallas; Dimitrios Rakopoulos; Georgios Mavrias. A Review on Management of End of Life Tires (ELTs) and Alternative Uses of Textile Fibers. Energies 2021, 14, 571 .

AMA Style

Panagiotis Grammelis, Nikolaos Margaritis, Petros Dallas, Dimitrios Rakopoulos, Georgios Mavrias. A Review on Management of End of Life Tires (ELTs) and Alternative Uses of Textile Fibers. Energies. 2021; 14 (3):571.

Chicago/Turabian Style

Panagiotis Grammelis; Nikolaos Margaritis; Petros Dallas; Dimitrios Rakopoulos; Georgios Mavrias. 2021. "A Review on Management of End of Life Tires (ELTs) and Alternative Uses of Textile Fibers." Energies 14, no. 3: 571.

Original paper
Published: 22 July 2020 in Waste and Biomass Valorization
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The aim of this paper is to test the applicability of upgraded agricultural biomass feedstock such as torrefied sunflower husks during combustion in small and medium heating applications. Sunflower husk is formed in large quantities at enterprises producing sunflower oil and can be used as biofuel. However, big problems arise due to the low bulk density of husks and the rapid growth of ash deposits on the heating surfaces of boilers. In order to solve these problems, it was proposed to produce pellets from husks, and to subject these pellets to torrefaction. After torrefaction, net calorific value was increased by 29% while the risk of high temperature corrosion of boilers was reduced. Signs of ash softening neither occurred in combustion of raw nor in combustion of torrefied sunflower husk pellets. High aerosol emissions, already present in raw sunflower husk pellets, could not be mitigated by torrefaction. First combustion results at medium scale furnaces indicated that sunflower husk pellets (both raw and torrefied) in a commercial boiler < 400 kW, operated in a mode with low primary zone temperatures (< 850 °C), meet current emission limits. Regarding the future upcoming emission limits according to the European Medium Combustion Plant Directive, additional measures are required in order to comply with the dust limits.

ACS Style

Norbert Kienzl; Nikolaos Margaritis; Rafail Isemin; Victor Zaychenko; Christoph Strasser; Dimitrios-Sotirios Kourkoumpas; Panagiotis Grammelis; Dmitry Klimov; Olga Larina; George Sytchev; Aleksandr Mikhalev. Applicability of Torrefied Sunflower Husk Pellets in Small and Medium Scale Furnaces. Waste and Biomass Valorization 2020, 12, 2579 -2596.

AMA Style

Norbert Kienzl, Nikolaos Margaritis, Rafail Isemin, Victor Zaychenko, Christoph Strasser, Dimitrios-Sotirios Kourkoumpas, Panagiotis Grammelis, Dmitry Klimov, Olga Larina, George Sytchev, Aleksandr Mikhalev. Applicability of Torrefied Sunflower Husk Pellets in Small and Medium Scale Furnaces. Waste and Biomass Valorization. 2020; 12 (5):2579-2596.

Chicago/Turabian Style

Norbert Kienzl; Nikolaos Margaritis; Rafail Isemin; Victor Zaychenko; Christoph Strasser; Dimitrios-Sotirios Kourkoumpas; Panagiotis Grammelis; Dmitry Klimov; Olga Larina; George Sytchev; Aleksandr Mikhalev. 2020. "Applicability of Torrefied Sunflower Husk Pellets in Small and Medium Scale Furnaces." Waste and Biomass Valorization 12, no. 5: 2579-2596.

Journal article
Published: 01 June 2020 in Journal of Energy Engineering
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Agricultural and waste-derived solid biomass fuels are available in vast amounts for the generation of sustainable energy. Since these fuels usually have rather low heating values, low bulk densities and are disadvantageous concerning their storage behavior, the torrefaction of such materials (low-temperature pyrolysis between 200°C and 320°C) represents an interesting procedure to improve their fuel properties. After the torrefaction of vine prunings for 30 min at 200°C and 220°C was performed in a pilot hearthtype reactor located in Ptolemais-Greece, the lower heating value (LHV) was increased by 3.7% and 10.5%, respectively, leading to important cost reductions during transport and storage. A comparative analysis of chemical properties between raw material and torrefied material is presented followed by calculating fuel-specific indices concerning corrosion risk, aerosol formation, and slagging tendency. Based on the NOx emission index, a lower conversion was predicted for the torrefied fuel than for the untreated fuel. High aerosol emissions are expected for raw fuel, even higher aerosol emissions for the torrefied fuel. According to the measured ash melting temperatures and calculation of the Rs index, raw fuel and torrefied fuel at 200°C present medium trend for deposit formulation, whereas there is a high trend for deposit formulation in the case of torrefied fuel at 220°C.

ACS Style

Nikolaos Margaritis; Panagiotis Grammelis; Emmanouil Karampinis; Ioanna-Panagiota Kanaveli. Impact of Torrefaction on Vine Pruning’s Fuel Characteristics. Journal of Energy Engineering 2020, 146, 04020006 .

AMA Style

Nikolaos Margaritis, Panagiotis Grammelis, Emmanouil Karampinis, Ioanna-Panagiota Kanaveli. Impact of Torrefaction on Vine Pruning’s Fuel Characteristics. Journal of Energy Engineering. 2020; 146 (3):04020006.

Chicago/Turabian Style

Nikolaos Margaritis; Panagiotis Grammelis; Emmanouil Karampinis; Ioanna-Panagiota Kanaveli. 2020. "Impact of Torrefaction on Vine Pruning’s Fuel Characteristics." Journal of Energy Engineering 146, no. 3: 04020006.

Journal article
Published: 09 May 2020 in Smart Cities
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Near Zero Energy and Positive Energy communities are expected to play a significant part in EU’s strategy to cut greenhouse gas emissions by 2050. Within this context, the work presented in this paper aims to investigate the feasibility of: (a) a new-built positive energy neighborhood; and (b) the retrofit of an existing neighborhood to near zero energy performance in the city of Alexandroupolis, Greece. Proposed measures involve the rollout at the community scale of renewable energy technologies (PV, geothermal heat pump), energy efficiency (fabric insulation, district heating and cooling networks) and storage systems (batteries). A parametric analysis is conducted to identify the optimum combination of technologies through suitable technical and financial criteria. Results indicate that zero and near zero emissions targets are met with various combinations that impose insulation levels, according to building regulations or slightly higher, and consider renewable energy production with an autonomy of half or, more commonly, one day. In addition, the advantages of performing nearly zero energy retrofit at the district, rather than the building level, are highlighted, in an attempt to stimulate interest in community energy schemes.

ACS Style

Vasileios Sougkakis; Konstantinos Lymperopoulos; Nikos Nikolopoulos; Nikolaos Margaritis; Paraskevi Giourka; Komninos Angelakoglou. An Investigation on the Feasibility of Near-Zero and Positive Energy Communities in the Greek Context. Smart Cities 2020, 3, 362 -384.

AMA Style

Vasileios Sougkakis, Konstantinos Lymperopoulos, Nikos Nikolopoulos, Nikolaos Margaritis, Paraskevi Giourka, Komninos Angelakoglou. An Investigation on the Feasibility of Near-Zero and Positive Energy Communities in the Greek Context. Smart Cities. 2020; 3 (2):362-384.

Chicago/Turabian Style

Vasileios Sougkakis; Konstantinos Lymperopoulos; Nikos Nikolopoulos; Nikolaos Margaritis; Paraskevi Giourka; Komninos Angelakoglou. 2020. "An Investigation on the Feasibility of Near-Zero and Positive Energy Communities in the Greek Context." Smart Cities 3, no. 2: 362-384.

Book chapter
Published: 01 January 2018 in Comprehensive Energy Systems
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Pyrolysis is regarded as a complex thermochemical process for converting biomass into energy and products consisting of bio-oil, solid biochar, and pyrolytic gas. Pyrolysis temperature significantly influences the properties of products while heating rate defines the type of biomass pyrolysis (fast, slow, etc.). Biochar can be utilized as solid fuel in boilers and other industrial processes, pyrolytic gas can be a renewable alternative fuel for internal combustion engines and other processes, whereas bio-oil has the potential to be used as a fuel oil substitute and transportation fuel. Physical or catalytic upgrading is employed in many cases for converting the bio-oil into useful biofuels and chemicals.

ACS Style

Panagiotis Grammelis; Nikolaos Margaritis; Dimitrios-Sotirios Kourkoumpas. 4.27 Pyrolysis Energy Conversion Systems. Comprehensive Energy Systems 2018, 1065 -1106.

AMA Style

Panagiotis Grammelis, Nikolaos Margaritis, Dimitrios-Sotirios Kourkoumpas. 4.27 Pyrolysis Energy Conversion Systems. Comprehensive Energy Systems. 2018; ():1065-1106.

Chicago/Turabian Style

Panagiotis Grammelis; Nikolaos Margaritis; Dimitrios-Sotirios Kourkoumpas. 2018. "4.27 Pyrolysis Energy Conversion Systems." Comprehensive Energy Systems , no. : 1065-1106.

Journal article
Published: 01 December 2017 in Fuel
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ACS Style

Rafail Isemin; Alexander Mikhalev; Dmitry Klimov; Panagiotis Grammelis; Nikolaos Margaritis; Dimitrios-Sotirios Kourkoumpas; Viktor Zaichenko. Torrefaction and combustion of pellets made of a mixture of coal sludge and straw. Fuel 2017, 210, 859 -865.

AMA Style

Rafail Isemin, Alexander Mikhalev, Dmitry Klimov, Panagiotis Grammelis, Nikolaos Margaritis, Dimitrios-Sotirios Kourkoumpas, Viktor Zaichenko. Torrefaction and combustion of pellets made of a mixture of coal sludge and straw. Fuel. 2017; 210 ():859-865.

Chicago/Turabian Style

Rafail Isemin; Alexander Mikhalev; Dmitry Klimov; Panagiotis Grammelis; Nikolaos Margaritis; Dimitrios-Sotirios Kourkoumpas; Viktor Zaichenko. 2017. "Torrefaction and combustion of pellets made of a mixture of coal sludge and straw." Fuel 210, no. : 859-865.

Journal article
Published: 01 April 2017 in Journal of Energy Engineering
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This paper describes the simulation of a wood gasification household boiler operation during the period that synthesis gas (syngas), which is produced after gasification, is further combusted for the production of heat that is transferred to the boiler heating surfaces. The particular boiler was designed by an Austrian company for the benefit of a Greek company based in northern Greece, which is currently manufacturing the boiler to test and further optimize it. The nominal fuel power of the boiler is approximately 50 kWth and its efficiency is about 90 percent (specifically 88.98 percent). The study is oriented toward the use of computational fluid dynamics (CFD) software as a supporting tool during the design phase of a gasification boiler and focuses on the combustion characteristics and the main gas emission concentrations expected at its outlet. In this study, the boiler is simulated under nominal operating conditions, assuming steady-state conditions as these have been defined by the Austrian company. Due to the highly transient and complex nature of wood log gasification, an ad-hoc thermodynamic model describing the associated characteristics of syngas under steady-state conditions has been developed and applied in the proposed CFD approach in order to overcome the highly complex modeling of syngas production. The numerical results are compared against the corresponding 0-D design data, since no available experimental data exist, to ensure the validity of the proposed model. The scope of this work is to achieve a better and deeper understanding of the expected emission characteristics at the boiler outlet and a better estimation of the heat transfer distribution among all different heat exchanging surfaces. However, in the near future, it is expected that the boiler will be tested at the premises of Thermodynamiki S.A (KOMBI) to identify possible discrepancies between the 3D CFD model results and the experimental values.

ACS Style

Panagiotis Drosatos; Athanasios Nesiadis; Nikolaos Nikolopoulos; Nikolaos Margaritis; Panagiotis Grammelis; Emmanuel Kakaras. CFD Simulation of Domestic Gasification Boiler. Journal of Energy Engineering 2017, 143, 04016052 .

AMA Style

Panagiotis Drosatos, Athanasios Nesiadis, Nikolaos Nikolopoulos, Nikolaos Margaritis, Panagiotis Grammelis, Emmanuel Kakaras. CFD Simulation of Domestic Gasification Boiler. Journal of Energy Engineering. 2017; 143 (2):04016052.

Chicago/Turabian Style

Panagiotis Drosatos; Athanasios Nesiadis; Nikolaos Nikolopoulos; Nikolaos Margaritis; Panagiotis Grammelis; Emmanuel Kakaras. 2017. "CFD Simulation of Domestic Gasification Boiler." Journal of Energy Engineering 143, no. 2: 04016052.

Journal article
Published: 01 January 2016 in International Journal of Global Warming
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The first step in the implementation of a SEAP is the collaboration of a BEI, as it will provide knowledge of the nature of the entities emitting CO

ACS Style

Nikolaos Margaritis; Petros Dallas; Panagiotis Grammelis; Dionysios Giannakopoulos. Implementation of a sustainable energy action plan for municipality of Ptolemaida. International Journal of Global Warming 2016, 10, 55 .

AMA Style

Nikolaos Margaritis, Petros Dallas, Panagiotis Grammelis, Dionysios Giannakopoulos. Implementation of a sustainable energy action plan for municipality of Ptolemaida. International Journal of Global Warming. 2016; 10 (1/2/3):55.

Chicago/Turabian Style

Nikolaos Margaritis; Petros Dallas; Panagiotis Grammelis; Dionysios Giannakopoulos. 2016. "Implementation of a sustainable energy action plan for municipality of Ptolemaida." International Journal of Global Warming 10, no. 1/2/3: 55.

Book chapter
Published: 01 January 2016 in Fuel Flexible Energy Generation
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Coal plays a decisive role in world energy production as coal-fired plants are responsible for 41% of the global power generation. Rapid industrialization and the worldwide growing energy demands have increased the utilization of coal, as it remains a relative cheap fuel, not associated with market shock prices or geopolitical turbulence. Based on the current production rates, coal reserves will be sufficient for more than 130 years. Different types of coal are utilized in different industrial sectors; coal characterization through ASTM procedures or standard analytical methods are used to determine critical properties for the optimization of end use.

ACS Style

Panagiotis Grammelis; Nikolaos Margaritis; Emmanouil Karampinis. Solid fuel types for energy generation. Fuel Flexible Energy Generation 2016, 29 -58.

AMA Style

Panagiotis Grammelis, Nikolaos Margaritis, Emmanouil Karampinis. Solid fuel types for energy generation. Fuel Flexible Energy Generation. 2016; ():29-58.

Chicago/Turabian Style

Panagiotis Grammelis; Nikolaos Margaritis; Emmanouil Karampinis. 2016. "Solid fuel types for energy generation." Fuel Flexible Energy Generation , no. : 29-58.

Journal article
Published: 01 October 2015 in Fuel Processing Technology
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ACS Style

A. Nesiadis; N. Nikolopoulos; N. Margaritis; P. Grammelis; E. Kakaras. Corrigendum to ‘Optimization of a log wood boiler through CFD simulation methods’. Fuel Processing Technology 2015, 138, 826 .

AMA Style

A. Nesiadis, N. Nikolopoulos, N. Margaritis, P. Grammelis, E. Kakaras. Corrigendum to ‘Optimization of a log wood boiler through CFD simulation methods’. Fuel Processing Technology. 2015; 138 ():826.

Chicago/Turabian Style

A. Nesiadis; N. Nikolopoulos; N. Margaritis; P. Grammelis; E. Kakaras. 2015. "Corrigendum to ‘Optimization of a log wood boiler through CFD simulation methods’." Fuel Processing Technology 138, no. : 826.

Journal article
Published: 01 December 2014 in Energy for Sustainable Development
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ACS Style

David Vera; Francisco Jurado; Nikolaos Margaritis; Panagiotis Grammelis. Experimental and economic study of a gasification plant fuelled with olive industry wastes. Energy for Sustainable Development 2014, 23, 247 -257.

AMA Style

David Vera, Francisco Jurado, Nikolaos Margaritis, Panagiotis Grammelis. Experimental and economic study of a gasification plant fuelled with olive industry wastes. Energy for Sustainable Development. 2014; 23 ():247-257.

Chicago/Turabian Style

David Vera; Francisco Jurado; Nikolaos Margaritis; Panagiotis Grammelis. 2014. "Experimental and economic study of a gasification plant fuelled with olive industry wastes." Energy for Sustainable Development 23, no. : 247-257.

Journal article
Published: 19 January 2014 in Waste and Biomass Valorization
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In this study, a fixed-bed downdraft gasifier (70 kW–245 kW) with gas cooling and cleaning system, combined with a gas engine, was tested using olive kernel as fuel. The primary scope of this paper is to identify the most prominent utilization paths for the solid residues of the process. After a 3-day experimental work and the respective sampling campaigns, a thorough characterization study was conducted: the mineralogy of collected residues was examined by means of XRD, Loss on Ignition tests were carried out by the use of TGA up to 850 °C, their morphology was examined by means of EDS-SEM, their energetic content and elemental composition were determined by means of proximate and ultimate analysis, respectively, while their major and trace metal characterization was conducted by means of AAS. Due to its high calorific value, relatively low moisture content, and high loss-on-ignition value, it has been concluded that the olive kernel gasification residue can be utilized as a primary fuel in combustion boilers. Moreover, its reduced chlorine and sulfur content suggest minimal corrosion-related problems. Alternative utilization options, based on their morphology, are also suggested in this study, while modifications in the current gasification conditions are proposed as well.

ACS Style

Grigorios Itskos; Nikolaos Margaritis; Athanasios Koutsianos; Panagiotis Grammelis. Characterization of Solid Residues from High Temperature Gasification of Olive Kernel. Waste and Biomass Valorization 2014, 5, 893 -901.

AMA Style

Grigorios Itskos, Nikolaos Margaritis, Athanasios Koutsianos, Panagiotis Grammelis. Characterization of Solid Residues from High Temperature Gasification of Olive Kernel. Waste and Biomass Valorization. 2014; 5 (5):893-901.

Chicago/Turabian Style

Grigorios Itskos; Nikolaos Margaritis; Athanasios Koutsianos; Panagiotis Grammelis. 2014. "Characterization of Solid Residues from High Temperature Gasification of Olive Kernel." Waste and Biomass Valorization 5, no. 5: 893-901.

Journal article
Published: 01 January 2014
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ACS Style

Nikolaos Margaritis. Introduction of renewable energy sources in the district heating System of Greece. 2014, 4, 43 -56.

AMA Style

Nikolaos Margaritis. Introduction of renewable energy sources in the district heating System of Greece. . 2014; 4 ():43-56.

Chicago/Turabian Style

Nikolaos Margaritis. 2014. "Introduction of renewable energy sources in the district heating System of Greece." 4, no. : 43-56.

Journal article
Published: 01 May 2007 in Topics in Catalysis
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The present paper employs and validates a NOx trap model which attempts an optimum compromise between complexity and predictive accuracy. It is shown that using the same set of kinetic data, the model is able to predict the storage rates and the maximum storage amounts as function of temperature. Moreover, the model predicts with reasonable accuracy the NO breakthrough during rich-mode regeneration and the spontaneous/thermal NO2 release when the temperature is increased in a saturated catalyst. The experimental findings highlight the importance of transient O2 adsorption/desorption phenomena which are incorporated in the model. The use of ultra-fast responding NO/NOx analyzers was necessary for the study and modeling of the transient operation following inlet composition switches.

ACS Style

Nikolaos K. Margaritis; Onoufrios Haralampous; Grigorios Koltsakis. Modeling of the NO x trap and experimental validation using ultra-fast NO x analyzers. Topics in Catalysis 2007, 42, 65 -69.

AMA Style

Nikolaos K. Margaritis, Onoufrios Haralampous, Grigorios Koltsakis. Modeling of the NO x trap and experimental validation using ultra-fast NO x analyzers. Topics in Catalysis. 2007; 42 (1):65-69.

Chicago/Turabian Style

Nikolaos K. Margaritis; Onoufrios Haralampous; Grigorios Koltsakis. 2007. "Modeling of the NO x trap and experimental validation using ultra-fast NO x analyzers." Topics in Catalysis 42, no. 1: 65-69.

Conference paper
Published: 03 April 2006 in SAE Technical Paper Series
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ACS Style

Grigorios Koltsakis; N. K. Margaritis; Onoufrios Haralampous; Z. C. Samaras. Development and Experimental Validation of a NOx Trap Model for Diesel Exhaust. SAE Technical Paper Series 2006, 1 .

AMA Style

Grigorios Koltsakis, N. K. Margaritis, Onoufrios Haralampous, Z. C. Samaras. Development and Experimental Validation of a NOx Trap Model for Diesel Exhaust. SAE Technical Paper Series. 2006; ():1.

Chicago/Turabian Style

Grigorios Koltsakis; N. K. Margaritis; Onoufrios Haralampous; Z. C. Samaras. 2006. "Development and Experimental Validation of a NOx Trap Model for Diesel Exhaust." SAE Technical Paper Series , no. : 1.

Conference paper
Published: 11 April 2005 in SAE Technical Paper Series
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ACS Style

Grigorios Koltsakis; Onoufrios Haralampous; Nikolaos Margaritis; Z. C. Samaras; C.-D. Vogt; E. Ohara; Y. Watanabe; T. Mizutani. 3-Dimensional Modeling of the Regeneration in SiC Particulate Filters. SAE Technical Paper Series 2005, 1 .

AMA Style

Grigorios Koltsakis, Onoufrios Haralampous, Nikolaos Margaritis, Z. C. Samaras, C.-D. Vogt, E. Ohara, Y. Watanabe, T. Mizutani. 3-Dimensional Modeling of the Regeneration in SiC Particulate Filters. SAE Technical Paper Series. 2005; ():1.

Chicago/Turabian Style

Grigorios Koltsakis; Onoufrios Haralampous; Nikolaos Margaritis; Z. C. Samaras; C.-D. Vogt; E. Ohara; Y. Watanabe; T. Mizutani. 2005. "3-Dimensional Modeling of the Regeneration in SiC Particulate Filters." SAE Technical Paper Series , no. : 1.