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    <id>4190</id>
    <completedYear/>
    <publishedYear>2007</publishedYear>
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    <language>eng</language>
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    <title language="eng">Structure-Dynamic Analysis of an Induction Machine depending on Stator-Housing Coupling</title>
    <abstract language="eng">The estimation and calculation of the acoustic sound of electric machinery is of high interest. Various approaches have been presented relying either on analytical or on numerical models. In general, the analytical models are based on the electromagnetic-field theory and the results are compared to measurements. Numerical models allow for the separation of different exciting forces stemming from various effects. In the studied case of an induction motor with squirrel-cage rotor three effects are taken into account in the analytical model: the fundamental field, saturation, and eccentricity. The numerical analysis is applied for the analysis of acoustic sound of an electric machine. Nevertheless, the numerical results have to be verified. Hence, they are compared to the physically based analytical results. The radiated noise depends directly on the surface's deformation of the machine. Therefore, the analysis is focused on the structure-dynamic vibrations. The combined analysis presented here, allows for the reduction of vibrations and noise optimizing the coupling of stator and housing. Here, an induction machine (IM) with squirrel-cage rotor is studied. Its housing is mounted with six spiral-steel springs to the stator. With the presented method the impact of different numbers of springs is analyzed.</abstract>
    <parentTitle language="eng">6th International Machine and Drives Conference, IEMDC</parentTitle>
    <identifier type="doi">10.1109/IEMDC.2007.383657</identifier>
    <identifier type="url">http://bib.iem.rwth-aachen.de/IEMpublications/AltesBib/2007CSHousing.pdf</identifier>
    <enrichment key="opus.import.data">@InProceedingsC-2007-20, title = Structure-Dynamic Analysis of an Induction Machine depending on Stator-Housing Coupling, author = Schlensok, C. and van der Giet, M. and Herranz Gracia, M. and van Riesen, D and Hameyer, K. , booktitle = 6th International Machine and Drives Conference, IEMDC, year = 2007, month = may, address = Antalya,Turkey, url = http://www.iem.rwth-aachen.de/uploads/bibliotest/2007CSHousing.pdf</enrichment>
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    <author>Christoph Schlensok</author>
    <author>Michael van der Giet</author>
    <author>Mercedes Herranz Gracia</author>
    <author>Dirk van Riesen</author>
    <author>Kay Hameyer</author>
  </doc>
  <doc>
    <id>4191</id>
    <completedYear/>
    <publishedYear>2007</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
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    <title language="eng">Influence of the magnetic anisotropy on electrical machines</title>
    <abstract language="eng">Non grain-oriented electrical steel has an inherent anisotropy, which is normally neglected in the calculation of electrical machines. Moreover, the magnetic anisotropy is usually measured in small material samples. Due to the cutting effect, the magnetic anisotropy in the machine is not the same as in the sample. In this paper, the magnetic anisotropy is considered as a global problem. A method to measure it is presented and its influence on the electromagnetic and acoustic behavior is considered through the example of an induction motor.</abstract>
    <parentTitle language="eng">XIII International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering, ISEF</parentTitle>
    <identifier type="url">http://bib.iem.rwth-aachen.de/IEMpublications/AltesBib/2008MHGInfluence.pdf</identifier>
    <enrichment key="opus.import.data">@InProceedingsC-2007-3, title = Influence of the magnetic anisotropy on electrical machines, author = Herranz Gracia, M. and Hameyer, K. , booktitle = XIII International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering, ISEF, year = 2007, month = sep, address = Prague, Czech Republic, url = http://www.iem.rwth-aachen.de/uploads/bibliotest/2007MHGInfluence.pdf</enrichment>
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    <author>Mercedes Herranz Gracia</author>
    <author>Kay Hameyer</author>
  </doc>
  <doc>
    <id>4192</id>
    <completedYear/>
    <publishedYear>2007</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
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    <title language="eng">Numerical Calculation of Iron Losses in Electrical Machines with a modified Post-Processing Formula</title>
    <parentTitle language="eng">16th International Conference on the Computation of Electromagnetic Fields, COMPUMAG</parentTitle>
    <identifier type="url">http://bib.iem.rwth-aachen.de/IEMpublications/AltesBib/2007MHGModified.pdf</identifier>
    <enrichment key="opus.import.data">@InProceedingsC-2007-9, title = Numerical Calculation of Iron Losses in Electrical Machines with a modified Post-Processing Formula, author = Herranz Gracia, M. and Lange, E. and Hameyer, K. , booktitle = 16th International Conference on the Computation of Electromagnetic Fields, COMPUMAG, year = 2007, month = jun, address = Aachen, Germany, url = http://www.iem.rwth-aachen.de/uploads/bibliotest/2007MHGModified.pdf</enrichment>
    <enrichment key="opus.import.dataHash">md5:003ee3d9cadfc82037d432f77c36c4a5</enrichment>
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    <enrichment key="opus.import.id">64eda57eb10e95.42405431</enrichment>
    <author>Mercedes Herranz Gracia</author>
    <author>E. Lange</author>
    <author>Kay Hameyer</author>
  </doc>
  <doc>
    <id>4193</id>
    <completedYear/>
    <publishedYear>2006</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
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    <title language="eng">Study of Temperature Rise Problems of Stepper Motors under High Duty Cycle</title>
    <parentTitle language="eng">42nd International Symposium on Electrical Machines, SME</parentTitle>
    <enrichment key="opus.import.data">@InProceedingsC-2006-27, title = Study of Temperature Rise Problems of Stepper Motors under High Duty Cycle, author = Herranz Gracia, M. and Hameyer, K. , booktitle = 42nd International Symposium on Electrical Machines, SME, year = 2006, month = jun, address = Cracow, Poland</enrichment>
    <enrichment key="opus.import.dataHash">md5:ff2f24ba3fd26ee911cbeef92ef30c30</enrichment>
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    <author>Mercedes Herranz Gracia</author>
    <author>Kay Hameyer</author>
  </doc>
  <doc>
    <id>4204</id>
    <completedYear/>
    <publishedYear>2008</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>753</pageFirst>
    <pageLast>759</pageLast>
    <pageNumber>7</pageNumber>
    <edition/>
    <issue>3</issue>
    <volume>44</volume>
    <type>article</type>
    <publisherName/>
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    <title language="eng">Structure-Dynamic Analysis of an Induction Machine Depending on Stator-Housing Coupling</title>
    <abstract language="eng">The estimation and the calculation of the acoustic sound of electric machinery are of particular interest nowadays. Various approaches have been presented, relying either on analytical or on numerical models. The analytical models presented here are based on the electromagnetic-field theory. Numerical models are applied to derive the exciting forces stemming from various sources and effects. The numerical results have to be verified. Hence, they are compared with the physically based analytical results. The radiated noise depends directly on the surface deformation of the machine. Therefore, the analysis is focused on the structure-dynamic vibration. The combined analysis presented here allows for the reduction of vibration and noise, optimizing the coupling of the machine's stator and housing. The studied induction machine's housing is mounted with six spiral-steel springs to the stator. With the presented method, the impact of different numbers of springs is analyzed exemplarily.</abstract>
    <parentTitle language="eng">IEEE Transactions on Industry Applications</parentTitle>
    <identifier type="issn">0093-9994</identifier>
    <identifier type="doi">10.1109/TIA.2008.921440</identifier>
    <enrichment key="opus.import.data">@ARTICLE4524005, title=Structure-Dynamic Analysis of an Induction Machine Depending on Stator-Housing Coupling, author=Schlensok, C. and van der Giet, M. and Herranz Gracia, M. and van Riesen, D. and Hameyer, K., journal=IEEE Transactions on Industry Applications, year=2008, month=Mai-Juni, volume=44, number=3, pages=753-759, keywords=asynchronous machines, finite element analysis, vibrationselectric machinery, induction machine, spiral-steel springs, stator-housing coupling, structure-dynamic analysis, doi=10.1109/TIA.2008.921440, ISSN=0093-9994,</enrichment>
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    <author>Christoph Schlensok</author>
    <author>Michael van der Giet</author>
    <author>Mercedes Herranz Gracia</author>
    <author>Dirk van Riesen</author>
    <author>Kay Hameyer</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>asynchronous machines</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>finite element analysis</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>vibrationselectric machinery</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>induction machine</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>spiral-steel springs</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>stator-housing coupling</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>structure-dynamic analysis</value>
    </subject>
  </doc>
  <doc>
    <id>4205</id>
    <completedYear/>
    <publishedYear>2006</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>1211</pageFirst>
    <pageLast>1214</pageLast>
    <pageNumber>4</pageNumber>
    <edition/>
    <issue>4</issue>
    <volume>42</volume>
    <type>article</type>
    <publisherName>IEEE</publisherName>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>--</completedDate>
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    <title language="eng">Combined Numerical and Analytical Method for Geometry Optimization of a PM Motor</title>
    <abstract language="eng">For the reduction of the cogging torque of permanent-magnet synchronous machines several approaches are known. But cogging torque predictions for arbitrary types of machines using the same approach are still troublesome and imprecise. Therefore, a fast optimization process is developed and presented in this paper. Here, the combination of both numerical and analytical simulation results in such a fast method</abstract>
    <parentTitle language="eng">IEEE Transactions on Magnetics</parentTitle>
    <identifier type="doi">10.1109/TMAG.2006.871379</identifier>
    <identifier type="url">http://bib.iem.rwth-aachen.de/IEMpublications/AltesBib/2006CSCombined.pdf</identifier>
    <enrichment key="opus.import.data">@ARTICLE J-2006-10, title = Combined Numerical and Analytical Method for Geometry Optimization of a PM Motor, author = Schlensok, C. and Herranz Gracia, M. and Hameyer, K. , journal = IEEE Transactions on Magnetics, year = 2006, month = April, volume = 43, number = 4, pages = 1211–1214, url = http://www.iem.rwth-aachen.de/uploads/bibliotest/2006CSCombined.pdf</enrichment>
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    <author>Christoph Schlensok</author>
    <author>Mercedes Herranz Gracia</author>
    <author>Kay Hameyer</author>
  </doc>
  <doc>
    <id>4206</id>
    <completedYear/>
    <publishedYear>2009</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>875</pageFirst>
    <pageLast>883</pageLast>
    <pageNumber>9</pageNumber>
    <edition/>
    <issue>4</issue>
    <volume>3</volume>
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    <title language="eng">Magnetic material optimization for hybrid vehicle PMSM drives</title>
    <abstract language="eng">The motivation of this analysis is the need of high efficiency and high power density permanent magnet synchronous motor (PMSM) drives for use in electrical vehicle power trains. It is clear that the chosen electrical steel for the lamination stack plays an important role, but proper quantification is missing. The purpose of this paper is to formalize the problem of selecting the optimal steel grade for the construction of PMSM’s. This question is important to steel producers, not only for helping customers selecting the most appropriate existing grade for their application, but also for defining the strategic orientation of the further R&amp;D of enhanced electrical steel grades. The notion of steel efficiency is defined and, after describing the FE implementation of iron loss models, a methodology for material optimisation is proposed.</abstract>
    <parentTitle language="eng">World Electric Vehicle Journal</parentTitle>
    <identifier type="issn">2032-6653</identifier>
    <identifier type="doi">10.3390/wevj3040875</identifier>
    <enrichment key="opus.import.data">@Articlewevj3040875, AUTHOR = Jacobs, Sigrid and Hectors, Dietrich and Henrotte, François and Hafner, Martin and Herranz Gracia, Mercedes and Hameyer, Kay and Goes, Patrick, TITLE = Magnetic material optimization for hybrid vehicle PMSM drives, JOURNAL = World Electric Vehicle Journal, VOLUME = 3, YEAR = 2009, NUMBER = 4, PAGES = 875–883, URL = https://www.mdpi.com/2032-6653/3/4/875, ISSN = 2032-6653, ABSTRACT = The motivation of this analysis is the need of high efficiency and high power density permanent magnet synchronous motor (PMSM) drives for use in electrical vehicle power trains. It is clear that the chosen electrical steel for the lamination stack plays an important role, but proper quantification is missing. The purpose of this paper is to formalize the problem of selecting the optimal steel grade for the construction of PMSM’s. This question is important to steel producers, not only for helping customers selecting the most appropriate existing grade for their application, but also for defining the strategic orientation of the further R&amp;amp;D of enhanced electrical steel grades. The notion of steel efficiency is defined and, after describing the FE implementation of iron loss models, a methodology for material optimisation is proposed., DOI = 10.3390/wevj3040875</enrichment>
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    <author>Sigrid Jacobs</author>
    <author>Dietrich Hectors</author>
    <author>François Henrotte</author>
    <author>Martin Hafner</author>
    <author>Mercedes Herranz Gracia</author>
    <author>Kay Hameyer</author>
    <author>Patrick Goes</author>
  </doc>
  <doc>
    <id>4207</id>
    <completedYear/>
    <publishedYear>2011</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst/>
    <pageLast/>
    <pageNumber/>
    <edition/>
    <issue>3</issue>
    <volume>30</volume>
    <type>article</type>
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    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>--</completedDate>
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    <title language="eng">Influence and evaluation of non-ideal manufacturing process on the cogging torque of a permanent magnet excited synchronous machine</title>
    <abstract language="eng">Purpose - The purpose of this paper is to describe how a minimisation of cogging torque is performed with respect to the non-ideal manufacturing process, aiming at a robust design of the studied machine, focusing on magnetisation faults and the use of different qualities of the permanent magnet material. Design/methodology/approach - The applied methodology is a combination of design of experiments and finite element analysis to minimise the cogging torque of the estimated machine. Different qualities of the permanent magnet material are investigated by a stochastic analysis. Findings - A robust design of the machine is achieved, which is verified by a stochastic analysis. Furthermore, this analysis shows the strong influence of the magnet quality on the cogging torque. Practical implications - This paper provides a method for a machine design which is robust against non-ideal manufacturing and an approach to prove the use of a bad quality for a possible reduction of the fabrication costs. Originality/value - This paper gives a close insight on how to investigate non-ideal manufacturing and in particular its influence on the cogging torque.</abstract>
    <parentTitle language="eng">COMPEL-The international journal for computation and mathematics in electrical and electronic engineering</parentTitle>
    <identifier type="doi">10.1108/03321641111110843</identifier>
    <enrichment key="opus.import.data">@articlecoenen2011influence, title=Influence and evaluation of non-ideal manufacturing process on the cogging torque of a permanent magnet excited synchronous machine, author=Coenen, Isabel and Herranz Gracia, Mercedes and Hameyer, Kay, journal=COMPEL-The international journal for computation and mathematics in electrical and electronic engineering, year=2011, publisher=Emerald Group Publishing Limited</enrichment>
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    <author>Isabel Coenen</author>
    <author>Mercedes Herranz Gracia</author>
    <author>Kay Hameyer</author>
  </doc>
  <doc>
    <id>4208</id>
    <completedYear/>
    <publishedYear>2021</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst/>
    <pageLast/>
    <pageNumber/>
    <edition/>
    <issue>11</issue>
    <volume>14</volume>
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    <contributingCorporation/>
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    <title language="eng">Design of a Medium Voltage Generator with DC-Cascade for High Power Wind Energy Conversion Systems</title>
    <abstract language="eng">This paper shows a new concept to generate medium voltage (MV) in wind power application to avoid an additional transformer. Therefore, the generator must be redesigned with additional constraints and a new topology for the power rectifier system by using multiple low voltage (LV) power rectifiers connected in series and parallel to increase the DC output voltage. The combination of parallel and series connection of rectifiers is further introduced as DC-cascade. With the resulting DC-cascade, medium output voltage is achieved with low voltage rectifiers and without a bulky transformer. This approach to form a DC-cascade reduces the effort required to achieve medium DC voltage with a simple rectifier system. In this context, a suitable DC-cascade control was presented and verified with a laboratory test setup. A gearless synchronous generator, which is highly segmented so that each segment can be connected to its own power rectifier, is investigated. Due to the mixed AC and DC voltage given by the DC-cascade structure, it becomes more demanding to the design of the generator insulation, which influences the copper fill factor and the design of the cooling system. A design strategy for the overall generator design is carried out considering the new boundary conditions.</abstract>
    <parentTitle language="eng">Energies</parentTitle>
    <identifier type="issn">1996-1073</identifier>
    <identifier type="doi">10.3390/en14113106</identifier>
    <enrichment key="opus.import.data">@Articleen14113106, AUTHOR = Steffen, Jonas and Lengsfeld, Sebastian and Jung, Marco and Ponick, Bernd and Herranz Gracia, Mercedes and Spagnolo, Aristide and Klöpzig, Markus and Schleicher, Klaus and Schäfer, Klaus, TITLE = Design of a Medium Voltage Generator with DC-Cascade for High Power Wind Energy Conversion Systems, JOURNAL = Energies, VOLUME = 14, YEAR = 2021, NUMBER = 11, ARTICLE-NUMBER = 3106, URL = https://www.mdpi.com/1996-1073/14/11/3106, ISSN = 1996-1073, ABSTRACT = This paper shows a new concept to generate medium voltage (MV) in wind power application to avoid an additional transformer. Therefore, the generator must be redesigned with additional constraints and a new topology for the power rectifier system by using multiple low voltage (LV) power rectifiers connected in series and parallel to increase the DC output voltage. The combination of parallel and series connection of rectifiers is further introduced as DC-cascade. With the resulting DC-cascade, medium output voltage is achieved with low voltage rectifiers and without a bulky transformer. This approach to form a DC-cascade reduces the effort required to achieve medium DC voltage with a simple rectifier system. In this context, a suitable DC-cascade control was presented and verified with a laboratory test setup. A gearless synchronous generator, which is highly segmented so that each segment can be connected to its own power rectifier, is investigated. Due to the mixed AC and DC voltage given by the DC-cascade structure, it becomes more demanding to the design of the generator insulation, which influences the copper fill factor and the design of the cooling system. A design strategy for the overall generator design is carried out considering the new boundary conditions., DOI = 10.3390/en14113106</enrichment>
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    <author>Jonas Steffen</author>
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    <author>Mercedes Herranz Gracia</author>
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    <title language="eng">Concept design of a high power superconducting generator for future hybrid-electric aircraft</title>
    <abstract language="eng">he reduction of emission is a key goals for the aviation industry. One enabling technology to achieve this goal, could be the transition from conventional gas turbines to hybrid-electric drive trains. However, the requirements concerning weight and efficiency that come from applications like short range aircraft are significantly higher than what state-of-the-art technology can offer. A key technology that potentially allows to achieve the necessary power and volume densities for rotating electric machines is superconductivity. In this paper we present the concept of a high power density generator that matches the speed of typical airborne turbines in its power class. The design is based on studies that cover topology selection and further electromagnetic, HTS, thermal, structural and cryogenics aspects. All domains were analyzed by means of analytical sizing and 2D/3D FEA modeling. With the help of our digital twin that is a synthesis of these models, we can demonstrate for the first time that under realistic assumptions on material properties gravimetric power densities beyond 20 kW kg−1 can be achieved.</abstract>
    <parentTitle language="eng">Superconductor Science and Technology</parentTitle>
    <identifier type="doi">10.1088/1361-6668/ab695a</identifier>
    <enrichment key="opus.import.data">@articlefilipenko2020concept, title=Concept design of a high power superconducting generator for future hybrid-electric aircraft, author=Filipenko, Mykhaylo and Kühn, Lars and Gleixner, Thomas and Thummet, Martin and Lessmann, Marc and Möller, Dirk and Böhm, Matthias and Schröter, Andreas and Häse, Kerstin and Grundmann, Jörn and Herranz Gracia, Mercedes, journal=Superconductor Science and Technology, volume=33, number=5, pages=054002, year=2020, publisher=IOP Publishing</enrichment>
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    <author>Mykhaylo Filipenko</author>
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    <title language="eng">Structure-Dynamic Simulation of an Induction Maschine with Eccentrically Positioned Squirrel-Cage Rotor</title>
    <parentTitle language="eng">XIII International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering, ISEF</parentTitle>
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    <title language="eng">Combined Numerical and Analytical Method for a Geometry Optimization of a PM Motor</title>
    <parentTitle language="eng">16th International Conference on the Computation of Electromagnetic Fields, COMPUMAG</parentTitle>
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    <title language="eng">Comparison of 2D Simulation and analytical calculation of the short-circuit behaviour of a permanent-magnet synchronous machine</title>
    <parentTitle language="eng">XIII International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering, ISEF</parentTitle>
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