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Cameron, ChristopherORCID iD iconorcid.org/0000-0001-6559-7694
Publications (10 of 11) Show all publications
Olsson, R., Cameron, C., Moreau, F., Marklund, E., Merzkirch, M. & Pettersson, J. (2024). Design, Manufacture, and Cryogenic Testing of a Linerless Composite Tank for Liquid Hydrogen. Applied Composite Materials
Open this publication in new window or tab >>Design, Manufacture, and Cryogenic Testing of a Linerless Composite Tank for Liquid Hydrogen
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2024 (English)In: Applied Composite Materials, ISSN 0929-189X, E-ISSN 1573-4897Article in journal (Refereed) Epub ahead of print
Abstract [en]

This paper describes design, manufacture, and testing of a linerless composite vessel for liquid hydrogen, having 0.3 m diameter and 0.9 m length. The vessel consists of a composite cylinder manufactured by wet filament winding of thin-ply composite bands, bonded to titanium end caps produced by additive manufacturing. The aim was to demonstrate the linerless design concept with a thin-ply composite for the cylinder. The investigation is limited to the internal pressure vessel, while real cryogenic tanks also involve an outer vessel containing vacuum for thermal insulation. Thermal stresses dominate during normal operation (4 bar) and the layup was selected for equal hoop strains in the composite cylinder and end caps during filling with liquid hydrogen. Two vessels were tested in 20 cycles, by filling and emptying with liquid nitrogen to 4 bar, without signs of damage or leakage. Subsequently, one vessel was tested until burst at almost 30 bar.

Place, publisher, year, edition, pages
Springer Nature, 2024
Keywords
Cryogenic liquids; Cylinders (shapes); Elasticity; Hydrogen; Liquefied gases; Pressure vessels; Structural design; Tanks (containers); Thermal insulation; Burst tests; Composite cylinders; Composite tank; Composite vessels; Cryogenic testing; End caps; Linerless composite tanks; Liquid hydrogens; Ply composites; Thin ply; Filament winding
National Category
Mechanical Engineering
Identifiers
urn:nbn:se:ri:diva-72888 (URN)10.1007/s10443-024-10219-y (DOI)2-s2.0-85188127999 (Scopus ID)
Funder
Swedish Energy Agency, P2021-90268Swedish Energy Agency, P2021-90061
Note

Open access funding provided by RISE Research Institutes of Sweden. This work was to 92% funded by Energimyndigheten (the Swedish Energy Agency) through contract P2021-90061. Co-funding was provided by Oxeon AB. Finalisation of the manuscript has subsequently been funded by the internal development funds of RISE and Energimyndigheten (the Swedish Energy Agency) through contract P2021-90268 via the Competence Centre TechForH2

Available from: 2024-04-26 Created: 2024-04-26 Last updated: 2024-05-23Bibliographically approved
Cameron, C., Hozić, D., Stig, F. & van der Veen, S. (2023). A method for optimization against cure-induced distortion in composite parts. Structural and multidisciplinary optimization (Print), 66(3), Article ID 51.
Open this publication in new window or tab >>A method for optimization against cure-induced distortion in composite parts
2023 (English)In: Structural and multidisciplinary optimization (Print), ISSN 1615-147X, E-ISSN 1615-1488, Vol. 66, no 3, article id 51Article in journal (Refereed) Published
Abstract [en]

This paper describes a novel method developed for the optimization of composite components against distortion caused by cure-induced residual stresses. A novel ply stack alteration algorithm is described, which is coupled to a parametrized CAD/FE model used for optimization. Elastic strain energy in 1D spring elements, used to constrain the structure during analysis, serves as an objective function incorporating aspects of global/local part stiffness in predicted distortion. Design variables such as the number and stacking sequence of plies, and geometric parameters of the part are used. The optimization problem is solved using commercial software combined with Python scripts. The method is exemplified with a case study of a stiffened panel subjected to buckling loads. Results are presented, and the effectiveness of the method to reduce the effects of cure-induced distortion is discussed. © 2023, The Author(s).

Place, publisher, year, edition, pages
Springer Science and Business Media Deutschland GmbH, 2023
Keywords
Computer aided design, Computer software, Curing, Strain energy, Composite components, Composite parts, Cure behavior, FE model, Finite element analyse, Novel methods, Optimisations, Process-models, Residual internal stress, Finite element method, Cure behaviour, Finite element analysis (FEA), Process modelling, Residual/internal stress
National Category
Applied Mechanics
Identifiers
urn:nbn:se:ri:diva-64238 (URN)10.1007/s00158-023-03504-0 (DOI)2-s2.0-85148694883 (Scopus ID)
Note

Correspondence Address: C. Cameron, RISE Research Institutes of Sweden, Sweden; 

 This project has received funding from the Clean Sky 2 Joint Undertaking under the European Union’s Horizon 2020 research and innovation programme under Grant Agreement No. 716864.

Available from: 2023-03-20 Created: 2023-03-20 Last updated: 2023-05-16Bibliographically approved
Hozić, D., Thore, C.-J., Cameron, C. & Loukil, M. (2023). Deterministic-based robust design optimization of composite structures under material uncertainty. Composite structures, 322, Article ID 117336.
Open this publication in new window or tab >>Deterministic-based robust design optimization of composite structures under material uncertainty
2023 (English)In: Composite structures, ISSN 0263-8223, E-ISSN 1879-1085, Vol. 322, article id 117336Article in journal (Refereed) Published
Abstract [en]

We propose a new deterministic robust design optimization method for composite laminate structures under worst-case material uncertainty. The method is based on a simultaneous parametrization of topology and material and combines a design problem and a material uncertainty problem into a single min–max optimization problem which provides an efficient approach to handle variation of material properties in stiffness driven design optimization problems. An analysis is performed using a design problem based on a failure criterion formulation to evaluate the ability of the proposed method to generate robust composite designs. The design problem is solved using various loads, boundary conditions and manufacturing constraints. The designs generated with the proposed method have improved objective responses compared to the worst-case response of designs generated with nominal material properties and are less sensitive to the variation of material properties. The analysis indicates that the proposed method can be efficiently applied in a robust structural optimization framework. © 2023 The Author(s)

Place, publisher, year, edition, pages
Elsevier Ltd, 2023
Keywords
Failure criterion, Hyperbolic function parametrization, Laminated composites, Material uncertainty, Robust optimization, Structural optimization, Failure (mechanical), Hyperbolic functions, Composites structures, Design problems, Deterministics, Failure criteria, Parametrizations, Robust design optimization, Structural optimisations
National Category
Computational Mathematics
Identifiers
urn:nbn:se:ri:diva-65692 (URN)10.1016/j.compstruct.2023.117336 (DOI)2-s2.0-85165542694 (Scopus ID)
Note

 Correspondence Address: D. Hozić; RISE Research Institutes of Sweden, Division of Materials and Production, Polymers, Fibers and Composites Department, Borås, Box 857, 501 15, Sweden; 

This work was financed by the Swedish Energy Agency (Energimyndigheten) through grant number P48175-1 and the Swedish Research Council under grant agreement No. 2019-04615 , and is associated with the Swedish Electromobility Center 1 1 (SEC). Their support is gratefully acknowledged. The authors would also like to thank Krister Svanberg for providing his implementation of GCMMA.

Available from: 2023-08-09 Created: 2023-08-09 Last updated: 2023-08-09Bibliographically approved
Hozić, D., Thore, C.-J., Cameron, C. & Loukil, M. (2023). Material uncertainty quantification for optimized composite structures with failure criteria. Composite structures, 305, Article ID 116409.
Open this publication in new window or tab >>Material uncertainty quantification for optimized composite structures with failure criteria
2023 (English)In: Composite structures, ISSN 0263-8223, E-ISSN 1879-1085, Vol. 305, article id 116409Article in journal (Refereed) Published
Abstract [en]

We propose a method to analyze effects of material uncertainty in composite laminate structures optimized using a simultaneous topology and material optimization approach. The method is based on computing worst-case values for the material properties and provides an efficient way of handling variation in material properties of composites for stiffness driven optimization problems. An analysis is performed to evaluate the impact of material uncertainty on designs from two design problems: Maximization of stiffness and minimization of a failure criteria index, respectively. The design problems are solved using different loads, boundary conditions and manufacturing constraints. The analysis indicates that the influence of material uncertainty is dependent on the type of optimization problem. For compliance problems the impact on the objective value is proportional to the changes of the constitutive properties and the effect of material uncertainty is consistent and predictable for the generated designs. The strength-based problem shows that material uncertainty has a significant impact on the response, and the effects of material uncertainty is not consistent and changes for different design requirements. In addition, the results show an increase of up to 25% of the maximum failure index when considering the worst-case deviation of the constitutive properties from their nominal values. © 2022 The Author(s)

Place, publisher, year, edition, pages
Elsevier Ltd, 2023
Keywords
Hyperbolic function parametrization (HFP), Laminated composites, Material uncertainty, Robust optimization, Structural optimization, Uncertainty quantification, Failure (mechanical), Hyperbolic functions, Materials handling, Stiffness, Uncertainty analysis, Design problems, Effects of materials, Failure criteria, Hyperbolic function parametrization, Optimization problems, Parametrizations, Structural optimisations, Uncertainty quantifications
National Category
Computational Mathematics
Identifiers
urn:nbn:se:ri:diva-62563 (URN)10.1016/j.compstruct.2022.116409 (DOI)2-s2.0-85145607861 (Scopus ID)
Note

 Funding details: Vetenskapsrådet, VR, 2019–04615; Funding details: Energimyndigheten, P48175-1; Funding text 1: This work is financed by the Swedish Energy Agency (Energimyndigheten) through grant number P48175-1 and the Swedish Research Council under grant agreement No 2019–04615, and is associated with the Swedish Electromobility Center 1 (SEC). Their support is gratefully acknowledged. The authors would also like to thank Krister Svanberg for providing his implementation of GCMMA.; Funding text 2: This work is financed by the Swedish Energy Agency (Energimyndigheten) through grant number P48175-1 and the Swedish Research Council under grant agreement No 2019–04615 , and is associated with the Swedish Electromobility Center 1 1 (SEC). Their support is gratefully acknowledged. The authors would also like to thank Krister Svanberg for providing his implementation of GCMMA.

Available from: 2023-01-23 Created: 2023-01-23 Last updated: 2023-01-23Bibliographically approved
Hozić, D., Thore, C.-J., Cameron, C. & Loukil, M. (2021). A new method for simultaneous material and topology optimization of composite laminate structures using Hyperbolic Function Parametrization. Composite structures, 276, Article ID 114374.
Open this publication in new window or tab >>A new method for simultaneous material and topology optimization of composite laminate structures using Hyperbolic Function Parametrization
2021 (English)In: Composite structures, ISSN 0263-8223, E-ISSN 1879-1085, Vol. 276, article id 114374Article in journal (Refereed) Published
Abstract [en]

This paper presents a new discrete parametrization method for simultaneous topology and material optimization of composite laminate structures, referred to as Hyperbolic Function Parametrization (HFP). The novelty of HFP is the way the candidate materials are parametrized in the optimization problem. In HFP, a filtering technique based on hyperbolic functions is used, such that only one design variable is used for any given number of material candidates. Compared to state-of-the-art methods such Discrete Material and Topology Optimization (DMTO) and Shape Function with Penalization (SFP), HFP has much fewer optimization variables and constraints but introduces additional non-linearity in the optimization problems. A comparative analysis of HFP, DMTO and SFP are performed based on the problem of maximizing the stiffness of composite plates under a total volume constraint and multiple manufacturing constraints using various loads, boundary conditions and input parameters. The comparison shows that all three methods are highly sensitive to the choice of input parameters for the optimization problem, although the performance of HFP is overall more consistent. HFP method performs similarly to DMTO and SFP in terms of the designs obtained and computational cost. However, HFP obtains similar or better objective function values compared to the DMTO and SFP methods. © 2021 The Author(s)

Place, publisher, year, edition, pages
Elsevier Ltd, 2021
Keywords
Composite sizing optimization, Hyperbolic function parametrization, Laminated composites, Multi-material optimization, Structural Optimization, Topology Optimization, Hyperbolic functions, Shape optimization, Topology, Discrete material optimizations, Discrete topology, Multi-material optimizations, Optimization function, Parametrizations, Shape functions, Structural optimisations, Topology optimisation
National Category
Computational Mathematics
Identifiers
urn:nbn:se:ri:diva-56006 (URN)10.1016/j.compstruct.2021.114374 (DOI)2-s2.0-85112835915 (Scopus ID)
Note

 Funding details: Energimyndigheten, P48175-1; Funding text 1: This work is financed by the Swedish Energy Agency (Energimyndigheten) through Grant No. P48175-1, and is associated with the Swedish Electromobility Center 3 3 (SEC). Their support is gratefully acknowledged. The authors would also like to thank Krister Svanberg for providing his implementation of GCMMA on which our optimization solver is based.

Available from: 2021-08-26 Created: 2021-08-26 Last updated: 2021-08-26Bibliographically approved
Cameron, C., Saseendran, S., Stig, F. & Rouhi, M. (2021). A rapid method for simulating residual stress to enable optimization against cure induced distortion. Journal of composite materials, 55(26), 3799
Open this publication in new window or tab >>A rapid method for simulating residual stress to enable optimization against cure induced distortion
2021 (English)In: Journal of composite materials, ISSN 0021-9983, E-ISSN 1530-793X, Vol. 55, no 26, p. 3799-Article in journal (Refereed) Published
Abstract [en]

In this paper a rapid method for residual cure stress analysis from composite manufacturing is presented. The method uses a high-fidelity path-dependent cure kinetics subroutine implemented in ABAQUS to calibrate a linear elastic model. The path-dependent model accounts for the tool-part interaction, forming pressure, and the changing composite modulus during the rubbery phase of matrix curing. Results are used to calculate equivalent lamina-wise coefficients of thermal expansion (CTE) in 3 directions for a linear temperature analysis. The goal is to accurately predict distortions for large complex geometries as rapidly as possible for use in an optimization framework. A carbon-epoxy system is studied. Simple coupons and complex parts are manufactured and measured with a 3 D scanner to compare the manufactured and simulated distortion. Results are presented and the accuracy and limitations of the rapid simulation method are discussed with particular focus on implementation in a numerical optimization framework. © The Author(s) 2021.

Place, publisher, year, edition, pages
SAGE Publications Ltd, 2021
Keywords
carbon-epoxy system, distortion prediction, Rapid method, residual cure stress analysis, thermal expansion, tool-part interaction, Curing, Optimization, Stress analysis, Coefficients of thermal expansions, Complex geometries, Composite manufacturing, Linear elastic model, Linear temperature, Numerical optimizations, Optimization framework, Numerical methods
National Category
Composite Science and Engineering
Identifiers
urn:nbn:se:ri:diva-55676 (URN)10.1177/00219983211024341 (DOI)2-s2.0-85110988175 (Scopus ID)
Note

 Funding details: Horizon 2020 Framework Programme, H2020, 716864; Funding text 1: The author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: This project has received funding from the Clean Sky 2 Joint Undertaking under the European Union’s Horizon 2020 research and innovation programme under grant agreement No 716864. The results and views expressed within this paper reflect the authors’ views only, and the JU is not responsible for any use that may be made of this information.

Available from: 2021-08-09 Created: 2021-08-09 Last updated: 2023-05-26Bibliographically approved
Cameron, C., Larsson, J., Loukil, M., Murtagh, T. & Wennhage, P. (2021). Bearing strength performance of mixed thin/thick-ply, quasi-isotropic composite laminates. Composite structures, 261, Article ID 113312.
Open this publication in new window or tab >>Bearing strength performance of mixed thin/thick-ply, quasi-isotropic composite laminates
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2021 (English)In: Composite structures, ISSN 0263-8223, E-ISSN 1879-1085, Vol. 261, article id 113312Article in journal (Refereed) Published
Abstract [en]

The effect of using thin plies to increase the bearing strength of composite laminates has been investigated. A series of 5 laminates of theoretically identical stiffness with varying proportions of thin plies were manufactured using a single material system. Four specimens from each plate were tested for bearing strength and damage was subsequently characterized using an optical microscope. The results show that performance in terms of bearing stiffness, strength at onset of damage, and ultimate bearing stress increase proportionally with the increasing amount of thin plies within the stack. Shifting from a 100% conventional ply laminate to a 100% thin-ply laminate gave an increase of 47% in the strength at onset of damage. Placement of the thin plies within the stack was also shown to be important for strength at initial onset of damage. Microscopic examination of the failure modes for all samples showed fiber kinking, localized to the center of the hole, to be the dominant failure mode regardless of the stacking sequence. © 2020 The Authors

Place, publisher, year, edition, pages
Elsevier Ltd, 2021
Keywords
Bearing strength, Composite failure, Thin ply, Stiffness, Bearing stiffness, Bearing strengths, Bearing stress, Composite laminate, Fiber-kinking, Material systems, Quasi-isotropic, Stacking sequence, Laminated composites
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-51468 (URN)10.1016/j.compstruct.2020.113312 (DOI)2-s2.0-85097745471 (Scopus ID)
Available from: 2021-01-11 Created: 2021-01-11 Last updated: 2021-06-21Bibliographically approved
Francis, S., Bru, T., Asp, L., Wysocki, M. & Cameron, C. (2021). Characterisation of tape-based carbon fibre thermoplastic discontinuous composites for energy absorption. Plastics, rubber and composites, 50(7), 351
Open this publication in new window or tab >>Characterisation of tape-based carbon fibre thermoplastic discontinuous composites for energy absorption
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2021 (English)In: Plastics, rubber and composites, ISSN 1465-8011, E-ISSN 1743-2898, Vol. 50, no 7, p. 351-Article in journal (Refereed) Published
Abstract [en]

Tape-based discontinuous composite is a relatively new type of composite material that offers improved mechanical properties for similar process-ability compared to Sheet Moulding Compound or Bulk Moulding Compound. This makes it potentially attractive for the automotive industry. In this paper, a thin-ply carbon fibre reinforced polypropylene-based discontinuous composite is studied. Mechanical tests are performed to obtain the tensile, compression and shear behaviour of the material. The energy absorption via tearing is also studied to assess the suitability of the material for energy absorption applications, such as crash-boxes. The tearing test results show a large degree of plastic deformation and an advancing damage front leading to higher specific energy absorption via tearing compared to conventional composite materials. © 2021 The Author(s). 

Place, publisher, year, edition, pages
Taylor and Francis Ltd., 2021
Keywords
crashworthiness, Discontinuous composites, energy absorption, mechanical properties, polypropylene, tearing, thermoplastics, Graphite fibers, Molding, Polypropylenes, Reinforced plastics, Compression and shear, Crash box, Fibre reinforced, Specific energy absorption
National Category
Composite Science and Engineering
Identifiers
urn:nbn:se:ri:diva-52969 (URN)10.1080/14658011.2021.1902119 (DOI)2-s2.0-85103569409 (Scopus ID)
Note

 Funding details: Horizon 2020, 721256; Funding text 1: This work has been performed as part of the ICONIC project under European Union's Horizon 2020 research and innovation programme, grant agreement no. 721256. The authors wish to thank Oxeon AB and Queens University of Belfast for providing the material for manufacturing.

Available from: 2021-04-26 Created: 2021-04-26 Last updated: 2023-06-08Bibliographically approved
Cameron, C. J., Saseendran, S., Stig, F. & Rouhi, M. (2018). A rapid method for residual cure stress analysis for optimization of cure induced distortion effects. In: ECCM 2018 - 18th European Conference on Composite Materials: . Paper presented at 18th European Conference on Composite Materials, ECCM 2018, 24 June 2018 through 28 June 2018. Applied Mechanics Laboratory
Open this publication in new window or tab >>A rapid method for residual cure stress analysis for optimization of cure induced distortion effects
2018 (English)In: ECCM 2018 - 18th European Conference on Composite Materials, Applied Mechanics Laboratory , 2018Conference paper, Published paper (Refereed)
Abstract [en]

Within this paper, the authors present a rapid method for residual cure stress analysis. The method uses a high-fidelity path-dependent cure kinetics analysis subroutine implemented in Abaqus to calibrate values for a linear elastic analysis. The path dependent model accounts for the tool-part interaction, forming pressure, and the changing composite modulus during the rubbery region of matrix curing during an arbitrary cure cycle. Results are used to calculate equivalent lamina-wise coefficients of thermal expansion (CTE) in 3 directions for a linear temperature analysis. The goal is to accurately predict distortions for large complex geometries with a single linear temperature load as rapidly and accurately as possible for use in an optimization framework. A carbon-epoxy system is studied. Simple parts are manufactured using unbalanced layups and out-of-autoclave methods. The resulting distortions are scanned with a 3D scanner and compared with simulation results for the same geometries. Further, a more complicated part is studied to compare the two methods using complex geometry. Results are presented and the accuracy and limitations of the rapid simulation method are discussed with particular focus on implementation in a numerical optimization framework.

Place, publisher, year, edition, pages
Applied Mechanics Laboratory, 2018
Keywords
Aerospace structures, Cure induced distortion, FEA, Optimization, Residual stress
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-43426 (URN)2-s2.0-85084161733 (Scopus ID)9781510896932 (ISBN)
Conference
18th European Conference on Composite Materials, ECCM 2018, 24 June 2018 through 28 June 2018
Note

Funding details: Horizon 2020, 716864; Funding text 1: This project has received funding from the Clean Sky 2 Joint Undertaking under the European Union’s Horizon 2020 research and innovation programme under grant agreement No 716864.The results and views expressed within this paper reflect only the authors’ views only, and the JU is not responsible for any use that may be made of this information.

Available from: 2020-01-31 Created: 2020-01-31 Last updated: 2023-05-26Bibliographically approved
O'Reilly, C. J., Göransson, P., Funazaki, A., Suzuki, T., Edlund, S., Gunnarsson, C., . . . Potting, J. (2016). Life cycle energy optimisation: A proposed methodology for integrating environmental considerations early in the vehicle engineering design process. Journal of Cleaner Production, 135, 750-759
Open this publication in new window or tab >>Life cycle energy optimisation: A proposed methodology for integrating environmental considerations early in the vehicle engineering design process
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2016 (English)In: Journal of Cleaner Production, ISSN 0959-6526, E-ISSN 1879-1786, Vol. 135, p. 750-759Article in journal (Refereed) Published
Abstract [en]

To enable the consideration of life cycle environmental impacts in the early stages of vehicle design, a methodology using the proxy of life cycle energy is proposed in this paper. The trade-offs in energy between vehicle production, operational performance and end-of-life are formulated as a mathematical problem, and simultaneously balanced with other transport-related functionalities, and may be optimised. The methodology is illustrated through an example design study, which is deliberately kept simple in order to emphasise the conceptual idea. The obtained optimisation results demonstrate that there is a unique driving-scenario-specific design solution, which meets functional requirements with a minimum life cycle energy cost. The results also suggest that a use-phase focussed design may result in a solution, which is sub-optimal from a life cycle point-of-view. © 2016 The Authors

Place, publisher, year, edition, pages
Elsevier Ltd, 2016
Keywords
Functional conflicts, Life cycle energy, Optimization, Vehicle design, Crashworthiness, Design, Economic and social effects, Environmental impact, Vehicles, Environmental considerations, Functional requirement, Life cycle energies, Life-cycle environmental impact, Mathematical problems, Operational performance, Life cycle
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-41061 (URN)10.1016/j.jclepro.2016.06.163 (DOI)2-s2.0-84990218392 (Scopus ID)
Note

Funding details: VINNOVA; Funding text 1: The authors would like to acknowledge the contribution of the Japan Automobile Research Institute (JARI) who provided funding for collecting the production energy inventory data. Additionally, the authors would like to thank Bombardier Transportation, Scania, AB Volvo and the Trafikverket (Swedish Transportation Agency) for their contribution to this work through participation in the Centre for ECO 2 Vehicle Design. The Swedish Innovation Agency, VINNOVA , is also gratefully acknowledged for its financial support through the VINN Excellence Center and VINNMER programmes.

Available from: 2019-12-10 Created: 2019-12-10 Last updated: 2021-06-21Bibliographically approved
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ORCID iD: ORCID iD iconorcid.org/0000-0001-6559-7694

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