Chair of Nonferrous Metallurgy (520)

Organisational unit: Chair

Research output

  1. 2025
  2. Published

    Mechanisms determining bendability in Al-Mg-Si-Fe crossover alloys

    Trink, B., Weißensteiner, I., Uggowitzer, P. J., Samberger, S., Coradini, D. S. R., Falkinger, G., Strobel, K. & Pogatscher, S., 1 Apr 2025, In: Acta Materialia. 287, 120810.

    Research output: Contribution to journalArticleResearchpeer-review

  3. Published
  4. 2024
  5. Published

    Von Erdgas zu Wasserstoff: Amag stellt seine Innovationsstrategie zur Erprobung klimaneutraler Anlagentechnik vor, Teil 2

    Tichy, S., Büchner, K., Wibner, S., Antrekowitsch, H., Pucher, P. & Prillhofer, B., 3 Dec 2024, In: International aluminium journal. 100.2024, 12, p. 52-57 6 p.

    Research output: Contribution to journalArticleResearch

  6. Published

    Unravelling nanometallurgy with in situ transmission electron microscopy: A case-study with copper nanowires

    Coradini, D. S. R., Tunes, M. A., Quick, C. R., Willenshofer, P., Kremmer, T., Luidold, S., Uggowitzer, P. & Pogatscher, S., Dec 2024, In: Nano today. 59.2024, December, 10 p., 102485.

    Research output: Contribution to journalArticleResearchpeer-review

  7. Published

    Impact of Surface Microstructure and Properties of Aluminum Electrodes on the Plating/Stripping Behavior of Aluminum-Based Batteries Using Imidazolium-Based Electrolyte

    Razaz, G., Weißensteiner, I., Örtegren, J., Trink, B., Pogatscher, S. & Arshadi Rastabi, S., 16 Nov 2024, In: ACS Applied Materials & Interfaces. 16.2024, 47, p. 64389-65740 52 p.

    Research output: Contribution to journalArticleResearchpeer-review

  8. Published

    Towards closed material cycles in lithium-ion batteries and PV systems: a sustainable resource approach

    Gerold, E., Ebenauer, K., Anbauer, A., Shaveko, S. & Antrekowitsch, H., 13 Nov 2024.

    Research output: Contribution to conferencePaperpeer-review

  9. Published
  10. Published
  11. Published

    Challenges in developing materials for microreactors: A case-study of yttrium dihydride in extreme conditions

    Tunes, M. A., Parkison, D., Huang, Y., Chancey, M. R., Vogel, S. C., Mehta, V. K., Torrez, M. A., Luther, E. P., Valdez, J. A., Wang, Y., Yu, J., Cinbiz, M. N., Shivprasad, A. P. & Kohnert, C. A., 1 Nov 2024, In: Acta Materialia. 280.2024, 1 November, 120333.

    Research output: Contribution to journalArticleResearchpeer-review

  12. Published
  13. Published

    Dispersoid evolution in Al–Zn–Mg alloys by combined addition of Hf and Zr: A mechanistic approach

    Wessely, V., Töpfer, U., Basu, I., Schäublin, R. E., Pogatscher, S., Uggowitzer, P. & Löffler, J. F., 6 Oct 2024, In: Materials and Design. 247.2024, November, 17 p., 113366.

    Research output: Contribution to journalArticleResearchpeer-review

  14. Published

    Overview on aluminium alloys as sinks for end-of-life vehicle scrap

    Pogatscher, S. & Samberger, S., 1 Oct 2024, In: IOP Conference Series: Materials Science and Engineering. 2024, 1315, 15 p., 012008.

    Research output: Contribution to journalArticleResearchpeer-review

  15. Published

    The Effect of Homogenization and Hot Deformation on the Recrystallization Behavior in Aluminum Alloy AA8079

    Santora, E., Pachnek, F., Falkinger, G., Pogatscher, S. & Hirsch, J., 23 Sept 2024, In: Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science. 55.2024, 12, p. 4914-4927 14 p.

    Research output: Contribution to journalArticleResearchpeer-review

  16. Published
  17. Published

    High-Performance Titanium Nitride Structural Coatings for Corrosion Protection of Aluminum-Based Proton Exchange Membrane Fuel Cells

    Silva, F. C., Ramirez, O. M. P., Sagás, J. C., Fontana, L. C., Melo, H. G. D., Schön, C. G. & Tunes, M. A., 3 Sept 2024, In: ACS materials letters. 6.2024, 10, p. 4564-4570 7 p.

    Research output: Contribution to journalArticleResearchpeer-review

  18. Published
  19. Published

    Unraveling the potential of Cu addition and cluster hardening in Al-Mg-Si alloys

    Aster, P., Dumitraschkewitz, P., Uggowitzer, P., Tunes, M. A., Schmid, F., Stemper, L. & Pogatscher, S., 24 Jul 2024, In: Materialia. 36.2024, August, 22 p., 102188.

    Research output: Contribution to journalArticleResearchpeer-review

  20. E-pub ahead of print

    Comparative analysis of experimental techniques for microstructural characterization of novel nanostructured aluminium alloys

    Willenshofer, P., Santa Rosa Coradini, D., Renk, O., Uggowitzer, P., Tunes, M. A. & Pogatscher, S., 11 Jul 2024, (E-pub ahead of print) In: Materials characterization. 215.2024, September, 8 p., 114154.

    Research output: Contribution to journalArticleResearchpeer-review

  21. Published

    Advancements in metal additive manufacturing: In-situ heat treatment of aluminium alloys during the laser powder bed fusion process

    Schimbäck, D., Kaserer, L., Mair, P., Mohebbi, M. S., Staron, P., Maier-Kiener, V., Letofsky-Papst, I., Kremmer, T., Palm, F., Montes, I., Höppel, H. W., Leichtfried, G. J. & Pogatscher, S., Jul 2024, In: Materials science and engineering: A, Structural materials: properties, microstructure and processing. 905.2024, July, 10 p., 146102.

    Research output: Contribution to journalArticleResearchpeer-review

  22. E-pub ahead of print

    Limitations of Hydrogen Detection After 150 Years of Research on Hydrogen Embrittlement

    Tunes, M. A., Uggowitzer, P., Dumitraschkewitz, P., Willenshofer, P., Samberger, S., da Silva, F., Schön, C. G., Kremmer, T., Antrekowitsch, H., Djukic, M. & Pogatscher, S., 25 Jun 2024, (E-pub ahead of print) In: Advanced Engineering Materials. 26.2024, 19, 18 p., 2400776.

    Research output: Contribution to journalArticleResearchpeer-review

  23. E-pub ahead of print

    Effect of cold rolling route and annealing on the microstructure and mechanical properties of AISI 316 L stainless steel

    Mohammadzehi, S., Roostaei, M., Mirzadeh, H., Mahmudi, R. & Weißensteiner, I., 9 Jun 2024, (E-pub ahead of print) In: Materials characterization. 214.2024, Ausgust, 10 p., 114072.

    Research output: Contribution to journalArticleResearchpeer-review

  24. Published

    Predictive Model for Catalytic Methane Pyrolysis

    Pototschnig, U., Matas, M., Scheiblehner, D., Neuschitzer, D., Obenaus-Emler, R., Antrekowitsch, H. & Holec, D., 25 May 2024, In: Journal of physical chemistry C (C, Nanomaterials and interfaces). 128.2024, 22, p. 9034-9040 7 p.

    Research output: Contribution to journalArticleResearchpeer-review

  25. Published

    Demonstration plant for hydrogen and carbon production via methane pyrolysis

    Wibner, S. & Sprung, A., 23 May 2024.

    Research output: Contribution to conferencePosterResearch

  26. Published

    Recycling of red mud from the aluminium industry

    Wibner, S., 23 May 2024.

    Research output: Contribution to conferencePosterResearch

  27. Published

    Utilization of Charcoal Obtained from Woody Biomass in Metallurgical Processes Based on Solid–Gas Reactions

    Dornig, C., Hanke, G. & Antrekowitsch, J., 18 May 2024, In: Metals. 14.2024, 5, 13 p., 592.

    Research output: Contribution to journalArticleResearchpeer-review

  28. Published

    Metallographic Etching of Al–Mg–Zn–(Cu) Crossover Alloys

    Samberger, S., Kremmer, T., Stemper, L., Tourey, S., Uggowitzer, P. & Pogatscher, S., 25 Apr 2024, In: Advanced engineering materials. 26.2024, 19, 7 p., 2400576.

    Research output: Contribution to journalArticleResearchpeer-review

  29. Published

    Christian Doppler Laboratory for selective recovery of minor metals using innovative process concepts

    Steinlechner, S., 5 Apr 2024.

    Research output: Contribution to conferencePosterResearchpeer-review

  30. Published

    Recovery of Cobalt, Nickel, and Lithium from Spent Lithium-Ion Batteries with Gluconic Acid Leaching Process: Kinetics Study

    Gerold, E., Lerchbammer, R. & Antrekowitsch, H., 2 Apr 2024, In: Batteries. 10.2024, 4, 14 p., 120.

    Research output: Contribution to journalArticleResearchpeer-review

  31. Published

    Recycling von verbrauchten Al-Kaffeekapseln

    Wibner, S., Samberger, S. & Antrekowitsch, H., Apr 2024

    Research output: Book/ReportCommissioned reportResearch

  32. Published

    Advancements and Challenges in Photovoltaic Cell Recycling: A Comprehensive Review

    Gerold, E. & Antrekowitsch, H., 20 Mar 2024, In: Sustainability. 16.2024, 6, 18 p., 2542.

    Research output: Contribution to journalReview articlepeer-review

  33. Published

    New strategies to improve Recycling and reduce CO2-emission of Aluminum production and processing

    Samberger, S., v. Czarnowski, P., Pogatscher, S. & Hirsch, J., 16 Mar 2024, In: Keikinzoku-yōsetsu = Journal of light metal welding. 62.2024, 3, p. 119-132 14 p.

    Research output: Contribution to journalArticleResearchpeer-review

  34. Published

    Automatic Texture Alignment by Optimization Method

    Ott, A. C., Weißensteiner, I., Arnoldt, A., Österreicher, J. A. & Papenberg, N. P., 8 Mar 2024, In: Microscopy and microanalysis. 30.2024, 2, p. 253-277 25 p.

    Research output: Contribution to journalArticleResearchpeer-review

  35. Published

    Modeling the concurrent growth of inter- and intragranular Si precipitates during slow cooling of the alloy AA6016

    Falkinger, G., Kahlenberg, R., Theissing, M., Mitsche, S., Thum, A. & Pogatscher, S., 22 Feb 2024, In: European journal of materials. 4.2024, 1, 23 p., 2316914.

    Research output: Contribution to journalArticleResearchpeer-review

  36. Published

    Influence of Solidification Rate and Impurity Content on 5/7-Crossover Alloys

    Samberger, S., Stemper, L., Uggowitzer, P., Tosone, R. & Pogatscher, S., 3 Feb 2024, The Minerals, Metals & Materials Series. Wagstaff, S. (ed.). Vol. 2024. p. 226-233 8 p. (Light Metals 2024).

    Research output: Chapter in Book/Report/Conference proceedingChapterResearch

  37. Published

    Influence of Water Vapor on the Oxidation Behavior of Molten Aluminum Magnesium Alloys

    Tichy, S., Doppermann, S., Pucher, P., Prillhofer, B., Wibner, S. & Antrekowitsch, H., 3 Feb 2024, Light Metals 2024. p. 890-896 7 p.

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

  38. Published

    Investigating the Potential of Secondary Aluminum Cast Alloys Used as Wrought Alloys

    Krall, P. & Pogatscher, S., 3 Feb 2024, Light Metals 2024. p. 191-195 5 p.

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

  39. Published
  40. Published

    Studies of Layer Growth During the Disintegration of Cemented Carbides with Vaporous Zinc

    Luznik, L. T., Gerold, E., Weirather, T., Czettl, C., Karhumaa, T. & Antrekowitsch, H., 3 Feb 2024, Rare Metal Technology 2024: TMS 2024. The Minerals, Metals & Materials Series. Springer, Cham.. Springer, p. 397 - 404

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

  41. Published

    Development of a Dross Build-Up Growth Process Model for Hot-Dip Galvanizing Considering Surface Reaction Kinetics

    Reiss, G., Eßl, W., Trasca, R. A., Mugrauer, C., Stefan-Kharicha, M., Kharicha, A., Gerold, E. & Goodwin, F., Feb 2024, In: Metallurgical and materials transactions. B, Process metallurgy and materials processing science. 55.2024, February, p. 53-63 11 p.

    Research output: Contribution to journalArticleResearchpeer-review

  42. Published
  43. Published
  44. Published
  45. Published
  46. Published
  47. Published
  48. Published
  49. Published
  50. Published
  51. Published
  52. Published
  53. Published
  54. Published
  55. Published
  56. Published

    Measurement of the heat transfer in the primary cooling area of a laboratory direct chill casting plant for alloy design.

    Weidinger, A., 2024, Light Metals 2024. p. 1055 - 1061 7 p.

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

  57. Published

    Microstructure evolution in Al-Mg-Si alloys controlled by Fe-rich intermetallic primary phases

    Trink, B., 2024.

    Research output: Contribution to conferencePosterResearch

  58. Published

    Mineralische Nebenprodukte und Abfälle 11: - Aschen, Schlacken, Stäube und Baurestmassen -

    Thiel, S., Thomé-Kozmiensky, E., Antrekowitsch, H., Pomberger, R. & Firsbach, F., 2024, 323 p.

    Research output: Book/ReportAnthologyResearch

  59. Published

    Nutzbarmachung von industriellen Reststoffen wie Stäuben, Schlämmen und Schlacken – Beurteilungssystem zur Erfassung und wirtschaftlichen Bewertung von sekundären Ressourcen

    Hanke, G. & Antrekowitsch, J., 2024, Mineralische Nebenprodukte und Abfälle 11 – Aschen, Schlacken, Stäube und Baurestmassen –. Vol. 11.

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

  60. Published
  61. Published
  62. Published

    Parameter variation study to optimize the extraction of chromium and nickel from stainless steel dust with hydrochloric acid

    Howard, T. W. & Steinlechner, S., 2024, 2024 - Sustainable Industrial Processing Summit : SIPS2024 Volume 10th Intl. Symp. on Sustainable Non-ferrous Smelting & Hydro/Electrochemical Processing.

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

  63. Published

    Pilot Plant for Hydrogen and Carbon Production via Methane Pyrolysis

    Wibner, S., 2024.

    Research output: Contribution to conferencePaperpeer-review

  64. Published
  65. Published
  66. Published
  67. Published
  68. 2023
  69. Published

    Recycling aluminum alloys for the automotive industry: Breaking the source-sink paradigm

    Krall, P., Weißensteiner, I. & Pogatscher, S., 18 Dec 2023, In: Resources, Conservation and Recycling. 202.2024, January, 11 p., 107370.

    Research output: Contribution to journalArticleResearchpeer-review

  70. Published

    Recycling, reuse, circular economy

    Part, F., Jandric, A., Gerold, E., Rutrecht, B., Prenner, S. & Nigl, T., 14 Dec 2023, Energy, environment, and resources.

    Research output: Chapter in Book/Report/Conference proceedingEntry for encyclopedia/dictionaryResearch

  71. Published
  72. Published
  73. Published

    Simultaneous Extraction of Valuable Metals from Iron-Containing Residues by Selective Chlorination and Evaporation

    Steinlechner, S. & Witt, K., Dec 2023, In: Mining, Metallurgy and Exploration. 40.2023, 6, p. 2023-2036 14 p.

    Research output: Contribution to journalArticleResearchpeer-review

  74. Published

    Precipitation behaviour in AlMgZnCuAg crossover alloy with coarse and ultrafine grains

    Willenshofer, P., Tunes, M. A., Kainz, C., Renk, O., Kremmer, T., Gneiger, S., Uggowitzer, P. & Pogatscher, S., 15 Nov 2023, In: Materials Research Letters. 11.2023, 12, p. 1063-1072 10 p.

    Research output: Contribution to journalArticleResearchpeer-review

  75. Published

    Strain-induced clustering in Al alloys

    Aster, P., Dumitraschkewitz, P., Uggowitzer, P., Schmid, F., Falkinger, G., Strobel, K., Kutleša, P., Tkadletz, M. & Pogatscher, S., 11 Nov 2023, In: Materialia. 32.2023, December, 7 p., 101964.

    Research output: Contribution to journalArticleResearchpeer-review

  76. Published
  77. E-pub ahead of print

    Fabrication of bulk delta-phase Zirconium Hydride from Zircaloy-4 for use as moderators in microreactors

    Parkison, D., Tunes, M., Nizolek, T. J., Saleh, T. A., Hosemann, P. M. & Kohnert, C., 10 Oct 2023, (E-pub ahead of print) In: Scripta Materialia. 239.2024, 15 January, 7 p., 115771.

    Research output: Contribution to journalArticleResearchpeer-review

  78. Published

    Precipitation behavior of hexagonal carbides in a C containing intermetallic γ-TiAl based alloy

    Burtscher, M., Weißensteiner, I., Wartbichler, R., Kirchheimer, K., Bernhard, C., Kiener, D. & Clemens, H., 4 Oct 2023, In: Journal of alloys and compounds. 969.2023, 25 December, 7 p., 172400.

    Research output: Contribution to journalArticleResearchpeer-review

  79. Published

    Influence of TiO2 on the crystallization behavior of BOF slag

    Steinlechner, S., 26 Sept 2023.

    Research output: Contribution to conferencePosterResearchpeer-review

  80. Published

    Influence of TiO2 on the crystallization behavior of BOF slag

    Steinlechner, S. & Haslinger, G. (Co-editor), 26 Sept 2023.

    Research output: Contribution to conferenceAbstractpeer-review

  81. E-pub ahead of print

    Towards a sustainable approach using mineral or carboxylic acid to recover lithium from lithium iron phosphate batteries

    Gerold, E., Lerchbammer, R., Strnad, C. & Antrekowitsch, H., 16 Sept 2023, (E-pub ahead of print) In: Hydrometallurgy. 222.2023, October, 12 p., 106187.

    Research output: Contribution to journalArticleResearchpeer-review

  82. Published

    Processing and microstructure–property relations of Al-Mg-Si-Fe crossover alloys

    Trink, B., Weißensteiner, I., Uggowitzer, P., Strobel, K., Hofer-Roblyek, A. & Pogatscher, S., 15 Sept 2023, In: Acta Materialia. 257.2023, 15 September, 27 p., 119160.

    Research output: Contribution to journalArticleResearchpeer-review

  83. Published

    PROCESSING A HYDROCARBON USING PYROLYSIS, METHOD AND APPARATUS

    Wibner, S. (Inventor), Sprung, A. (Inventor), Antrekowitsch, H. (Inventor), Neuschitzer, D. (Inventor) & Scheiblehner, D. (Inventor), 14 Sept 2023, IPC No. B01J8/22, C01B3/26, Patent No. WO2023169691A1·2023-09-14, Priority date 3 Nov 2022, Priority No. EP2022056379W·2022-03-11

    Research output: Patent

  84. E-pub ahead of print

    Assessment of different processing strategies to fabricate bulk Mg-Fe nanocomposites

    Roostaei, M., Uggowitzer, P., Pippan, R. & Renk, O., 12 Sept 2023, (E-pub ahead of print) In: Journal of Alloys and Metallurgical Systems. 4.2023, December, 9 p., 100034.

    Research output: Contribution to journalArticleResearchpeer-review

  85. Published

    The use of treated lead slag as a substitute for natural sand in concretes

    Wölfler, C., Hanke, G. & Antrekowitsch, J., 6 Sept 2023, p. 355. 360 p.

    Research output: Contribution to conferencePaperpeer-review

  86. Published

    Ce nanoparticles and sol-gel hybrid organic-inorganic coatings maximize corrosion protection in the anodized AA2024-T3

    Prada Ramirez, O. M., Kremmer, T., Marin, J. H., da Silva, B. P., Starykevich, M., Tunes, M., Ferreira, M. G. S., Aoki, I. V., Ando, R. A., Pogatscher, S. & de Melo, H. G., 15 Aug 2023, In: Corrosion science. 221.2023, 15 August, 21 p., 111330.

    Research output: Contribution to journalArticleResearchpeer-review

  87. E-pub ahead of print

    Comparison of reduction kinetics of Fe2O3, ZnOFe2O3 and ZnO with hydrogen (H2) and carbon monoxide (CO)

    Brandner, U. & Leuchtenmüller, M., 2 Aug 2023, (E-pub ahead of print) In: International Journal of Hydrogen Energy . 49.2024, Part A, 2 January, p. 775-785 11 p.

    Research output: Contribution to journalArticleResearchpeer-review

  88. Published
  89. Published

    Effect of compressibility on industrial DC electric arcs

    Al Nasser, M., Barati, H., Redl, C., Ishmurzin, A., Voller, N., Hackl, G., Leuchtenmüller, M., Wu, M. & Kharicha, A., 22 Jul 2023, In: Results in Engineering. 19.2023, September, 12 p., 101312.

    Research output: Contribution to journalArticleResearchpeer-review

  90. Published

    Hydrogen Production by Methane Pyrolysis in Molten Cu-Ni-Sn Alloys

    Scheiblehner, D., Antrekowitsch, H., Neuschitzer, D., Wibner, S. & Sprung, A., 21 Jul 2023, In: Metals. 13.2023, 7, 15 p., 1310.

    Research output: Contribution to journalArticleResearchpeer-review

  91. Published

    Methane pyrolysis for hydrogen production in a liquid metal bubble column reactor

    Neuschitzer, D., 10 Jul 2023.

    Research output: Contribution to conferencePosterResearch

  92. Published

    Deformation and fatigue behaviour of additively manufactured Scalmalloy® with bimodal microstructure

    Schimbäck, D., Kaserer, L., Mair, P., Palm, F., Leichtfried, G. J., Pogatscher, S. & Hohenwarter, A., Jul 2023, In: International Journal of Fatigue. 172.2023, July, 14 p., 107592.

    Research output: Contribution to journalArticleResearchpeer-review

  93. Published

    In situ transmission electron microscopy as a toolbox for the emerging science of nanometallurgy

    Santa Rosa Coradini, D., Tunes, M. A., Willenshofer, P., Samberger, S., Kremmer, T., Dumitraschkewitz, P., Uggowitzer, P. & Pogatscher, S., 16 Jun 2023, In: Lab on a Chip. 23.2023, 14, p. 3186-3193 8 p.

    Research output: Contribution to journalArticleResearchpeer-review

  94. Published

    Deformation Analysis in Novel Aluminum Alloys

    Weißensteiner, I., 15 Jun 2023, EMC 2023 Proceedings. 11 p.

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

  95. Published

    Characterisation and evaluation of biochar for use in metallurgical aggregates

    Dornig, C., 14 Jun 2023.

    Research output: Contribution to conferencePresentationResearch

  96. Published

    Characterisation of aluminium scrap on a laboratory scale

    Wibner, S. & Antrekowitsch, H., 14 Jun 2023, p. 1-11. 11 p.

    Research output: Contribution to conferencePaperpeer-review

  97. Published

    Evaluation and characterization of biochar for use in metallurgical aggregates

    Dornig, C., 14 Jun 2023.

    Research output: Contribution to conferencePaperpeer-review

  98. Published

    Modification of heavy metal containing slags for use as sand substitute in concrete

    Wölfler, C., Antrekowitsch, J. & Hanke, G., 13 Jun 2023.

    Research output: Contribution to conferencePaperpeer-review

  99. Published
  100. Published

    SeLiReco 2.0 - A more sustainable process for the recycling of lithium-ion batteries

    Gerold, E., Lerchbammer, R. & Antrekowitsch, H., 13 Jun 2023, p. 1. 13 p.

    Research output: Contribution to conferencePaperpeer-review

  101. Published

    Avoidance of quantity limitations in the use of fluorine - containing feedstocks through selective removal in the zinc production process

    Steinlechner, S., 12 Jun 2023.

    Research output: Contribution to conferencePresentationResearchpeer-review

  102. Published
  103. Published

    Recycling of cemented carbides with gaseous zinc including particular consideration of GGI

    Luznik, L. T., Gerold, E., Luidold, S., Weirather, T., Pachlhofer, J., Czettl, C., Karhumaa, T. & Antrekowitsch, H., 12 Jun 2023, Proceedings of EMC 2023.

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

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