Maria Nikolova Avramova

Works (49)

Updated: April 5th, 2024 09:25

2023 journal article

Challenge for the validation of high-fidelity multi-physics LWR modeling and simulation: Development of new experiments in research reactors

FRONTIERS IN ENERGY RESEARCH, 11.

By: C. Vaglio-Gaudard*, C. Destouches*, A. Hawari n, M. Avramova n, K. Ivanov n, T. Valentine*, P. Blaise*, J. Hudelot*

author keywords: multi-physics; high-fidelity; coupling; validation; experiment; research reactors; reactivity feedback effects
Sources: Web Of Science, NC State University Libraries
Added: March 6, 2023

2023 journal article

Development of an efficient and improved core thermal-hydraulics predictive capability for fast reactors: Summary of research and development activities at the North Carolina state University

NUCLEAR ENGINEERING AND DESIGN, 412.

By: C. Takasugi n, A. Aly n, D. Holler n, A. Abarca n, B. Beeler n, M. Avramova n, K. Ivanov n

author keywords: CTF; Sodium fast reactors; Multi-physics; Hi2Lo
UN Sustainable Development Goal Categories
Sources: Web Of Science, NC State University Libraries
Added: August 21, 2023

2023 journal article

Fuel performance uncertainty quantification and sensitivity analysis in the presence of epistemic and aleatoric sources of uncertainties

FRONTIERS IN ENERGY RESEARCH, 11.

By: Q. Faure n, G. Delipei n, A. Petruzzi, M. Avramova n & K. Ivanov n

author keywords: fuel performance; uncertainty quantification (UQ); sensitivity analysis (SA); aleatoric uncertainty; epistemic uncertainty; pellet cladding mechanical interaction (PCMI)
Sources: Web Of Science, NC State University Libraries
Added: April 17, 2023

2023 journal article

Preservation of kinetics parameters generated by Monte Carlo calculations in two-step deterministic calculations

EPJ NUCLEAR SCIENCES & TECHNOLOGIES, 9.

TL;DR: Study of the preservation of bilinearly-weighted quantities in the Serpent–Griffin calculation procedure finds sensitivities to multigroup energy grid selection and regional application of SPH equivalence were demonstrated to be reduced through the use of a transport method together with a finer energy grid. (via Semantic Scholar)
UN Sustainable Development Goal Categories
7. Affordable and Clean Energy (OpenAlex)
Sources: Web Of Science, NC State University Libraries
Added: March 27, 2023

2022 journal article

Ab initio molecular dynamics investigation of gamma-(U,Zr) structural and thermal properties as a function of temperature and composition

JOURNAL OF NUCLEAR MATERIALS, 561.

By: A. Aly, B. Beeler n & M. Avramova n

author keywords: AIMD; DFT; Nuclear fuel element; Metallic Fuel; Uranium; U-Zr
UN Sustainable Development Goal Categories
7. Affordable and Clean Energy (OpenAlex)
Sources: Web Of Science, NC State University Libraries
Added: May 23, 2022

2022 journal article

CTF-PARCS Core Multi-Physics Computational Framework for Efficient LWR Steady-State, Depletion and Transient Uncertainty Quantification

ENERGIES, 15(14).

By: G. Delipei n, P. Rouxelin n, A. Abarca n, J. Hou n, M. Avramova n & K. Ivanov n

author keywords: multi-physics; CTF; PARCS; LWR; uncertainty quantification
UN Sustainable Development Goal Categories
6. Clean Water and Sanitation (OpenAlex)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: July 20, 2022

2022 journal article

CTF: A modernized, production-level, thermal hydraulic solver for the solution of industry-relevant challenge problems in pressurized water reactors

NUCLEAR ENGINEERING AND DESIGN, 397.

By: R. Salko*, A. Wysocki*, T. Blyth*, A. Toptan*, J. Hu*, V. Kumar*, C. Dances*, W. Dawn n ...

author keywords: Subchannel; LWR; CTF; VERA
UN Sustainable Development Goal Categories
Sources: Web Of Science, NC State University Libraries
Added: September 26, 2022

2022 journal article

Digital-twin-based improvements to diagnosis, prognosis, strategy assessment, and discrepancy checking in a nearly autonomous management and control system

ANNALS OF NUCLEAR ENERGY, 166.

By: L. Lin n, P. Athe n, P. Rouxelin n, M. Avramova n, A. Gupta n, R. Youngblood*, J. Lane*, N. Dinh n

Contributors: L. Lin n, P. Athe n, P. Rouxelin n, M. Avramova n, A. Gupta n, R. Youngblood*, J. Lane*, N. Dinh n

author keywords: autonomous control; digital twin; diagnosis; prognosis
TL;DR: This study refines a NAMAC system for making reasonable recommendations during complex loss-of-flow scenarios with a validated Experimental Breeder Reactor II simulator, digital twins improved by machine-learning algorithms, a multi-attribute decision-making scheme, and a discrepancy checker for identifying unexpected recommendation effects. (via Semantic Scholar)
Sources: Web Of Science, NC State University Libraries, ORCID
Added: November 1, 2021

2022 journal article

Extending a low-order inhomogeneous adjoint equations model to a higher-order model with verification on integral applications

ANNALS OF NUCLEAR ENERGY, 177.

By: M. Altahhan n, R. Geemert, M. Avramova* & K. Ivanov*

author keywords: Nodal Expansion Method (NEM); Adjoint Lagrange Multiplier; Axial Offset (AO); Perturbation analysis; Sensitivity analysis; IAEA
UN Sustainable Development Goal Categories
Sources: Web Of Science, NC State University Libraries
Added: May 30, 2023

2022 journal article

Investigation of ?-(U, Zr) structural properties and its interfacial properties with liquid sodium using ab initio molecular dynamics

JOURNAL OF NUCLEAR MATERIALS, 567.

By: A. Aly, B. Beeler n & M. Avramova n

author keywords: Uranium; Metallic fuel; Interfacial energy; Elastic constants; Sodium bond; Sound velocity
UN Sustainable Development Goal Categories
7. Affordable and Clean Energy (Web of Science; OpenAlex)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: June 4, 2022

2022 journal article

Off-line vs. semi-implicit TH-TH coupling schemes: A BEPU comparison

ANNALS OF NUCLEAR ENERGY, 178.

By: M. Casamor*, M. Avramova n, F. Reventos* & J. Freixa*

author keywords: PWR; Coupling; BEPU; DNBR
UN Sustainable Development Goal Categories
Source: Web Of Science
Added: October 2, 2023

2022 journal article

Propagation of VHTRC manufacturing uncertainties with RAVEN/PHISICS

ANNALS OF NUCLEAR ENERGY, 165.

By: P. Rouxelin n, A. Alfonsi*, G. Strydom*, M. Avramova n & K. Ivanov n

author keywords: PHISICS; RAVEN; VHTRC; Manufacturing Uncertainties; Monte Carlo Sampling
UN Sustainable Development Goal Categories
7. Affordable and Clean Energy (OpenAlex)
Sources: Web Of Science, NC State University Libraries
Added: November 8, 2021

2021 journal article

Development and verification of a higher-order mathematical adjoint nodal diffusion solver

ANNALS OF NUCLEAR ENERGY, 163.

By: M. Altahhan n, R. Geemert*, M. Avramova n & K. Ivanov n

author keywords: Nodal Expansion Method (NEM); Lagrange multiplier; Adjoint; Diffusion equation; Verification; Perturbation analysis; Sensitivity analysis; IAEA-3D benchmark
UN Sustainable Development Goal Categories
Sources: Web Of Science, NC State University Libraries
Added: September 7, 2021

2021 journal article

Summary of comparative analysis and conclusions from OECD/NEA LWR-UAM benchmark Phase I

NUCLEAR ENGINEERING AND DESIGN, 384.

By: G. Delipei n, J. Hou n, M. Avramova n, P. Rouxelin n & K. Ivanov n

author keywords: LWR; Uncertainty analysis; Benchmark; Neutronics; Summary
UN Sustainable Development Goal Categories
6. Clean Water and Sanitation (OpenAlex)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: October 1, 2021

2020 article

Developments in thermal-hydraulic sub-channel modeling for whole core multi-physics simulations

Avramova, M. (2020, March). NUCLEAR ENGINEERING AND DESIGN, Vol. 358.

By: M. Avramova n

author keywords: Sub-channel modeling; Whole core multi-physics simulations; Physics-informed data-driven modeling
UN Sustainable Development Goal Categories
Source: Web Of Science
Added: February 10, 2020

2020 journal article

Modular high temperature gas reactor core modeling with RELAP5-3D/ PHISICS ? Optimization schemes for load following

NUCLEAR ENGINEERING AND DESIGN, 362.

By: P. Balestra n, K. Henry n, C. Carlyon n, C. English n, J. Myer n, M. Avramova n, A. Epiney*, G. Strydom*

UN Sustainable Development Goal Categories
Source: Web Of Science
Added: July 6, 2020

2019 journal article

A new fuel modeling capability, CTFFuel, with a case study on the fuel thermal conductivity degradation

NUCLEAR ENGINEERING AND DESIGN, 341, 248–258.

By: A. Toptan n, R. Salko*, M. Avramova n, K. Clarno* & D. Kropaczek n

author keywords: CTFFuel; Thermal conductivity degradation; CTF; SQA; Verification
UN Sustainable Development Goal Categories
7. Affordable and Clean Energy (OpenAlex)
Source: Web Of Science
Added: December 31, 2018

2019 journal article

A surrogate model based on sparse grid interpolation for boiling water reactor subchannel void distribution

ANNALS OF NUCLEAR ENERGY, 131, 51–62.

By: A. Bennett*, N. Martin* & M. Avramova n

author keywords: Sparse grids; Void distribution; Local void model; F-COBRA-TF; ATRIUM 10; APOLLO2-A
UN Sustainable Development Goal Categories
6. Clean Water and Sanitation (OpenAlex)
Source: Web Of Science
Added: July 22, 2019

2019 journal article

CTF-R: A novel residual-based thermal hydraulic solver

NUCLEAR ENGINEERING AND DESIGN, 348, 37–45.

By: N. Porter*, V. Mousseau* & M. Avramova n

author keywords: Subchannel analysis; Residual; CTF; COBRA
TL;DR: This work develops a novel residual-based code, CTF-R, which is not limited by the strict computational limitations of the early 1980’s, and can therefore be designed such that it is inherently flexible and easy to use. (via Semantic Scholar)
Source: Web Of Science
Added: June 4, 2019

2019 journal article

Gap conductance modeling I: Theoretical considerations for single- and multi-component gases in curvilinear coordinates

NUCLEAR ENGINEERING AND DESIGN, 353.

By: A. Toptan n, D. Kropaczek n & M. Avramova n

author keywords: Gap conductance; Temperature jump distance; Thermal accommodation coefficient; Static load; Mixture
UN Sustainable Development Goal Categories
7. Affordable and Clean Energy (OpenAlex)
Source: Web Of Science
Added: October 21, 2019

2019 journal article

Gap conductance modeling II: Optimized model for UO2-Zircaloy interfaces

NUCLEAR ENGINEERING AND DESIGN, 355.

By: A. Toptan n, D. Kropaczek n & M. Avramova n

author keywords: Gap conductance; Continuum; Ross-Stoute; Nuclear fuel performance; Uncertainty; Doppler temperature
UN Sustainable Development Goal Categories
6. Clean Water and Sanitation (OpenAlex)
Source: Web Of Science
Added: November 18, 2019

2019 journal article

On the validity of the dilute gas assumption for gap conductance calculations in nuclear fuel performance codes

NUCLEAR ENGINEERING AND DESIGN, 350, 1–8.

By: A. Toptan n, D. Kropaczek n & M. Avramova

author keywords: Fill gas thermal conductivity; Gap conductance; Fuel performance; Doppler; Mixture thermal conductivity; Rod internal pressure; Dilute; Dense
UN Sustainable Development Goal Categories
7. Affordable and Clean Energy (OpenAlex)
13. Climate Action (Web of Science)
Source: Web Of Science
Added: June 24, 2019

2019 article

Quantified Validation with Uncertainty Analysis for Turbulent Single-Phase Friction Models

Porter, N. W., Mousseau, V. A., & Avramova, M. N. (2019, December 2). NUCLEAR TECHNOLOGY, Vol. 205, pp. 1607–1617.

By: N. Porter n, V. Mousseau* & M. Avramova n

author keywords: Model form error; uncertainty analysis; validation; friction factor
Source: Web Of Science
Added: December 9, 2019

2018 journal article

Application of sub-channel modeling to BWR core analysis

ANNALS OF NUCLEAR ENERGY, 115, 294–302.

By: C. Gosdin* & M. Avramova n

author keywords: BWR; CTF; CASL; Sub-channel; Validation
UN Sustainable Development Goal Categories
Source: Web Of Science
Added: August 6, 2018

2018 journal article

CFD prediction of critical heat flux in vertical heated tubes with uniform and non-uniform heat flux

NUCLEAR ENGINEERING AND DESIGN, 326, 403–412.

By: Q. Li, M. Avramova n, Y. Jiao, P. Chen, J. Yu*, Z. Pu, J. Chen

author keywords: Subcooled boiling; Critical heat flux; DNB; Non-uniform heat flux; Boiling curves
UN Sustainable Development Goal Categories
13. Climate Action (Web of Science)
Source: Web Of Science
Added: August 6, 2018

2018 journal article

Implementation and assessment of wall friction models for LWR core analysis

ANNALS OF NUCLEAR ENERGY, 115, 565–572.

By: A. Toptan n, N. Porter n, R. Salko* & M. Avramova n

author keywords: Friction factor; CTF; Pressure drop; Subchannel analysis; Validation; Verification
TL;DR: The modeling of frictional pressure drop in the nuclear thermal hydraulics subchannel code, CTF, is improved through the addition of three new modeling options which allow the code to account for the effects of surface roughness and the third enables a user-supplied option. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Source: Web Of Science
Added: August 6, 2018

2018 journal article

Three-dimensional multi-physics modeling of hydrogen and hydride distribution in zirconium alloy cladding

PROGRESS IN NUCLEAR ENERGY, 105, 294–300.

By: M. Mankosa* & M. Avramova n

author keywords: Hydrogen; Hydride; Multi-physics; BISON; Tiamat
UN Sustainable Development Goal Categories
Source: Web Of Science
Added: August 6, 2018

2018 journal article

Uncertainty Quantification Study of CTF for the OECD/NEA LWR Uncertainty Analysis in Modeling Benchmark

NUCLEAR SCIENCE AND ENGINEERING, 190(3), 271–286.

By: N. Porter n, M. Avramova n & V. Mousseau*

author keywords: Organisation for Economic Co-operation and Development/Nuclear Energy Agency Light Water Reactor Uncertainty Analysis in Modeling Benchmark; thermal hydraulics; CTF
UN Sustainable Development Goal Categories
Source: Web Of Science
Added: August 6, 2018

2018 journal article

Validation of CTF pressure drop and void predictions for the NUPEC BWR database

NUCLEAR ENGINEERING AND DESIGN, 337, 291–299.

By: N. Porter n & M. Avramova n

UN Sustainable Development Goal Categories
Source: Web Of Science
Added: October 16, 2018

2017 journal article

Comparative analysis of different fidelity fuel performance models for fuel temperature predictions

NUCLEAR ENGINEERING AND DESIGN, 322, 464–473.

By: F. Raja*, M. Mankosa* & M. Avramova n

author keywords: CTF; BISON; FRAPCON; Nuclear; Fuel performance
UN Sustainable Development Goal Categories
7. Affordable and Clean Energy (OpenAlex)
Source: Web Of Science
Added: August 6, 2018

2017 journal article

Evaluation of modeling options for in-pellet power distribution and gap gas conductance for accurate fuel temperature predictions

PROGRESS IN NUCLEAR ENERGY, 100, 135–145.

By: F. Raja* & M. Avramova n

author keywords: CTF; FRAPCON; Nuclear; Fuel temperature; Gap gas conductance
UN Sustainable Development Goal Categories
7. Affordable and Clean Energy (OpenAlex)
Source: Web Of Science
Added: August 6, 2018

2017 journal article

High-fidelity multi-physics coupling for determination of hydride distribution in Zr-4 cladding

ANNALS OF NUCLEAR ENERGY, 110, 475–485.

By: I. Davis*, O. Courty*, M. Avramova n & A. Motta*

UN Sustainable Development Goal Categories
Source: Web Of Science
Added: August 6, 2018

2017 journal article

Multi-physics code system with improved feedback modeling

PROGRESS IN NUCLEAR ENERGY, 98, 94–108.

By: M. Yilmaz*, M. Avramova n & J. Andersen*

author keywords: Doppler feedback; Fuel thermal conductivity degradation; Nudear reactor multi-physics; CTF/TORT-TD; CTF/TORT-TD/FRAPCON-FRAPTRAN
UN Sustainable Development Goal Categories
Source: Web Of Science
Added: August 6, 2018

2016 journal article

Coupled MCNP6/CTF code: Development, testing, and application

ANNALS OF NUCLEAR ENERGY, 96, 1–11.

By: A. Bennett n, M. Avramova n & K. Ivanov n

author keywords: MCNP6; CTF; Internal coupling; Relaxation acceleration
TL;DR: The relaxation acceleration technique was applied to the coupled code and was shown that it could satisfy much stricter convergence criterions and can also guarantee convergence and be used as a tool to decrease the computational time. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: Web Of Science, NC State University Libraries
Added: August 6, 2018

2016 journal article

Development, verification, and validation of a fuel thermal conductivity degradation model in CTF

ANNALS OF NUCLEAR ENERGY, 97, 246–261.

By: M. Yilmaz*, M. Avramova n & J. Andersen*

author keywords: Fuel thermal conductivity; Fuel centerline temperature; CTF; FRAPCON-3.4
UN Sustainable Development Goal Categories
7. Affordable and Clean Energy (OpenAlex)
Source: Web Of Science
Added: August 6, 2018

2016 journal article

Impact of fuel thermal conductivity degradation on Doppler feedback during rod ejection accident

NUCLEAR ENGINEERING AND DESIGN, 307, 339–353.

By: M. Yilmaz*, M. Avramova n & J. Andersen*

UN Sustainable Development Goal Categories
Source: Web Of Science
Added: August 6, 2018

2015 journal article

High-fidelity multi-physics system TORT-TD/CTF/FRAPTRAN for light water reactor analysis

Annals of Nuclear Energy, 84, 234–243.

By: J. Magedanz*, M. Avramova*, Y. Perin* & A. Velkov*

author keywords: Coupled codes; COBRA-TF; FRAPTRAN; High-fidelity; Fuel performance
Source: Crossref
Added: February 24, 2020

2015 journal article

Multi-physics and multi-scale benchmarking and uncertainty quantification within OECD/NEA framework

Annals of Nuclear Energy, 84, 178–196.

By: M. Avramova*, K. Ivanov*, T. Kozlowski, I. Pasichnyk, W. Zwermann, K. Velkov, E. Royer, A. Yamaji, J. Gulliford

author keywords: Benchmark; Uncertainty; Multi-physics; Multi-scale
TL;DR: Second set of the NEA/OECD benchmarks have been initiated by the Expert Group on Uncertainty Analysis in Modelling (EGUAM) at the Nuclear Science Committee (NSC) to address the current trends in the development of LWR multi-physics and multi-scale modeling and simulation. (via Semantic Scholar)
Sources: Crossref, NC State University Libraries
Added: February 24, 2020

2015 journal article

Optimization and parallelization of the thermal–hydraulic subchannel code CTF for high-fidelity multi-physics applications

Annals of Nuclear Energy, 84, 122–130.

By: R. Salko*, R. Schmidt* & M. Avramova*

author keywords: Subchannel; COBRA-TF; Parallel; MPI; CTF
TL;DR: Major improvements to the computational infrastructure of the CTF subchannel code are described so that full-core, pincell-resolved simulations can now be performed in much shorter run-times, either in stand-alone mode or as part of coupled-code multi-physics calculations. (via Semantic Scholar)
Source: Crossref
Added: August 28, 2020

2014 journal article

Coupled 3D neutronics/thermal hydraulics modeling of the SAFARI-1 MTR

Annals of Nuclear Energy, 73, 122–130.

By: A. Rosenkrantz*, M. Avramova*, K. Ivanov*, R. Prinsloo*, D. Botes* & K. Elsakhawy*

TL;DR: A comparison allows for the first time to perform a quantification of steady-state errors for a low-powered MTR with an advanced thermal–hydraulic code such as CTF on a per-channel basis as compared to simpler and coarser-mesh RELAP5-3D modeling. (via Semantic Scholar)
UN Sustainable Development Goal Categories
7. Affordable and Clean Energy (OpenAlex)
Sources: Crossref, NC State University Libraries
Added: August 28, 2020

2014 journal article

Investigations on coupled code PWR simulations using COBRA-TF with soluble boron tracking model

Progress in Nuclear Energy, 77, 72–83.

By: M. Biery* & M. Avramova*

author keywords: Boron dilution; Boron tracking model; Coupled code; Natural circulation
Source: Crossref
Added: August 28, 2020

2014 journal article

Multi-dimensional boron transport modeling in subchannel approach: Part I. Model selection, implementation and verification of COBRA-TF boron tracking model

Nuclear Engineering and Design, 278, 701–712.

By: O. Ozdemir*, M. Avramova* & K. Sato*

Source: Crossref
Added: August 28, 2020

2014 journal article

Multi-dimensional boron transport modeling in subchannel approach: Part II. Validation of CTF boron tracking model and adding boron precipitation model

Nuclear Engineering and Design, 278, 713–722.

By: O. Ozdemir* & M. Avramova*

UN Sustainable Development Goal Categories
6. Clean Water and Sanitation (OpenAlex)
Source: Crossref
Added: August 28, 2020

2013 journal article

A multi-scale homogenization and reconstruction approach for solid material temperature calculations in prismatic high temperature reactor cores

Nuclear Engineering and Design, 256, 1–13.

By: I. Clifford*, K. Ivanov* & M. Avramova*

Sources: Crossref, NC State University Libraries
Added: August 28, 2020

2013 journal article

New developments of the MCNP/CTF/NEM/NJOY code system – Monte Carlo based coupled code for high accuracy modeling

Annals of Nuclear Energy, 51, 18–26.

By: F. Espel*, M. Avramova*, K. Ivanov* & S. Misu

author keywords: MCNP5; COBRA-TF; NEM; NJOY; Coupled calculations; BWR
TL;DR: This paper presents the latest studies and ameliorations developed to this coupled hybrid system, which includes a new methodology for generation and interpolation of Temperature-Dependent Thermal Scattering Cross Section Libraries for MCNP5, a comparison between sub-channel approaches, and acceleration schemes. (via Semantic Scholar)
Sources: Crossref, NC State University Libraries
Added: August 28, 2020

2013 journal article

Uncertainty analysis of sub-channel code calculated ONB wall superheat in rod bundle experiments using the GRS methodology

Progress in Nuclear Energy, 65, 42–49.

By: R. Salko* & M. Avramova*

author keywords: VIPRE-I; SUSA; NESTOR; ONB
Source: Crossref
Added: August 28, 2020

2010 journal article

Verification, validation and uncertainty quantification in multi-physics modeling for nuclear reactor design and safety analysis

Progress in Nuclear Energy, 52(7), 601–614.

By: M. Avramova* & K. Ivanov*

author keywords: Verification; Validation; Uncertainty; Design; Analysis
Sources: Crossref, NC State University Libraries
Added: August 28, 2020

2007 journal article

Challenges in coupled thermal–hydraulics and neutronics simulations for LWR safety analysis

Annals of Nuclear Energy, 34(6), 501–513.

By: K. Ivanov* & M. Avramova*

TL;DR: The issues related to the consistent qualification of coupled code systems as well as their application to different types of LWR transients are presented and the advances in numerical and computation techniques for coupled code simulations are summarized with outlining remaining challenges. (via Semantic Scholar)
Sources: Crossref, NC State University Libraries
Added: August 28, 2020

2006 journal article

Evaluation and enhancement of COBRA-TF efficiency for LWR calculations

Annals of Nuclear Energy, 33(9), 837–847.

By: D. Cuervo*, M. Avramova*, K. Ivanov* & R. Miró*

TL;DR: Results indicate that the direct inversion method is the best option for small cases, while both new solvers converge smoothly regardless of the nature of simulated cases and the mesh structures and improve the stability and accuracy of results compared to the classic Gauss–Seidel iterative method. (via Semantic Scholar)
UN Sustainable Development Goal Categories
7. Affordable and Clean Energy (OpenAlex)
Sources: Crossref, NC State University Libraries
Added: August 28, 2020

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