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Abstract

One of the major conflicts between populist and non-populist forces (movements, parties, governments) as well as the European Union (EU) institutions has manifested in the area of immigration policy. This article investigates how the influx of migrants in 2015-2016 was subsequently used by populists as a policy conflict ground within the EU. In this context, it particularly looks at how the problem of migration was framed and map the policy responses in the selected EU Member States. The article covers the 2015-2018 period and includes the following countries: France, Germany, Greece, Italy, Hungary, and Poland.
The article observes that the 2015-2016 migration crisis and the response to it led to (or reinvigorated existing) politicisation of the topic across the EU, forcing the parties from all sides of the political spectrum to take a position on it. Simultaneously, one may also observe a process of securitisation of migration in the political debate in all analysed countries. Irregular migration was construed as a security threat by many political parties and leaders, requiring emergency measures and justifying actions outside the normal bounds of political and legal procedures. While the securitisation strategy was most visible in the discourse of the right-wing populist parties, its elements were progressively taken by the mainstream parties, arguably in response to increased salience of the issue.
The article also finds a correlation between the ideological profile of the parties and their approach to the migration crisis and the proposed EU response. All the parties located close to the right extreme tended to take a strong anti-immigration and anti-EU stance. All of them also ranked high in the populist index. On the other hand, the populist parties located on the left side or in the centre of the political spectrum took a moderate stance on this issue.
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Authors and Affiliations

Łukasz Gruszczyński
1 2
ORCID: ORCID
Réka Friedery
2
ORCID: ORCID

  1. Kozminski University (Poland)
  2. HUN-REN Centre for Social Sciences, MTA Centre of Excellence (Hungary)
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Abstract

Biogas, a renewable fuel, has low operational stability range in burners due to its inherent carbon-dioxide content. In cross-flow configuration, biogas is injected from a horizontal injector and air is supplied in an orthogonal direction to the fuel flow. To increase the stable operating regime, backward facing steps are used. Systematic numerical simulations of these flames are reported here. The comprehensive numerical model incorporates a chemical kinetic mechanism having 25 species and 121 elementary reactions, multicomponent diffusion, variable thermo-physical properties, and optically thin approximation based volumetric radiation model. The model is able to predict different stable flame types formed behind the step under different air and fuel flow rates, comparable to experimental predictions. Predicted flow, species, and temperature fields in the flames within the stable operating regime, revealing their anchoring positions relative to the rear face of the backward facing step, which are difficult to be measured experimentally, have been presented in detail. Resultant flow field behind a backward facing step under chemically reactive condition is compared against the flow fields under isothermal and non-reactive conditions to reveal the significant change the chemical reaction produces. Effects of step height and step location relative to the fuel injector are also presented.
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Bibliography

[1] D. Andriani, A. Wresta, T.D. Atmaja, and A. Saepudin. A review on optimization production and upgrading biogas through CO 2 removal using various techniques. Applied Biochemistry and Biotechnology, 172(4):1909–1928, 2014. doi: 10.1007/s12010-013-0652-x.
[2] I.U. Khan, Mohd H.D. Othman, H. Hashim, T. Matsuura, A.F. Ismail, M. Rezaei-DashtArzhandi, and I. Wan Azelee. Biogas as a renewable energy fuel – A review of biogas upgrading utilization and storage. Energy Conversion and Management, 150:277–294, 2017. doi: 10.1016/j.enconman.2017.08.035.
[3] S. Rasi, A. Veijanen, and J. Rintala. Trace compounds of biogas from different biogas production plants. Energy, 32(8):1375–1380, 2007. doi: 10.1016/j.energy.2006.10.018.
[4] E. Ryckebosh, M. Drouillon, and H. Vervaeren. Techniques for transformation of biogas to biomethane. Biomass and Bioenergy, 35(5):1633–1645, 2011. doi: 10.1016/j.biombioe.2011.02.033.
[5] R.J. Spiegel, and J.L. Preston. Test results for fuel cell operation on anaerobic digester gas. Journal of Power Sources, 86(1-2):283–288, 2000. doi: 10.1016/S0378-7753(99)00461-9.
[6] H.-C. Shin, J.-W. Park, K. Park, and H.-C. Song. Removal characteristics of trace compounds of landfill gas by activated carbon adsorption. Environmental Pollution, 119(2):227–236, 2002. doi: 10.1016/s0269-7491(01)00331-1.
[7] R.J. Spiegel and J.L. Preston. Technical assessment of fuel cell operation on anaerobic digester gas at the Yonkers, NY, wastewater treatment plant. Waste Management, 23(8):709–717, 2003. doi: 10.1016/S0956-053X(02)00165-4.
[8] A. Lock, S.K. Aggarwal, I.K. Puri, and U. Hegde. Suppression of fuel and air stream diluted methane-air partially premixed flames in normal and microgravity. Fire Safety Journal, 43(1):24–35, 2008. doi: 10.1016/j.firesaf.2007.02.004.
[9] T. Leung and I. Wierzba. The effect of hydrogen addition on biogas non-premixed jet flame stability in a co-flowing air stream. International Journal of Hydrogen Energy, 33(14):3856–3862, 2008. doi: 10.1016/j.ijhydene.2008.04.030.
[10] A.M. Briones, S.K. Aggarwal, and V. Katta. A numerical investigation of flame liftoff, stabilization, and blowout. Physics of Fluids, 18(4):043603, 2006. doi: 10.1063/1.2191851.
[11] C.-E. Lee and C.-H. Hwang. An experimental study on the flame stability of LFG and LFG-mixed fuels. Fuel, 86(5-6):649–655, 2007. doi: 10.1016/j.fuel.2006.08.033.
[12] L. Xiang, H. Chu, F. Ren, and M. Gu. Numerical analysis of the effect of CO 2 on combustion characteristics of laminar premixed methane/air flames. Journal of the Energy Institute, 92(5):1487–1501, 2019. doi: 10.1016/j.joei.2018.06.018.
[13] N. Hinton and R. Stone. Laminar burning velocity measurements of methane and carbon dioxide mixtures (biogas) over wide ranging temperatures and pressures. Fuel, 116:743–750, 2014. doi: 10.1016/j.fuel.2013.08.069.
[14] S. Jahangirian, A. Engeda, and I.S. Wichman. Thermal and chemical structure of biogas counterflow diffusion flames. Energy and Fuels, 23(11):5312–5321, 2009. doi: 10.1021/ef9002044.
[15] A. Mameri and F. Tabet. Numerical investigation of counter-flow diffusion flame of biogas-hydrogen blends: Effects of biogas composition, hydrogen enrichment and scalar dissipation rate on flame structure and emissions. International Journal of Hydrogen Energy, 41(3):2011–2022, 2016. doi: 10.1016/j.ijhydene.2015.11.035.
[16] J.I. Erete, K.J. Hughes, L. Ma, M. Fairweather, M. Pourkashanian, and A. Williams. Effect of CO 2 dilution on the structure and emissions from turbulent, non-premixed methane-air jet flames. Journal of the Energy Institute, 90(2):191–200, 2017. doi: 10.1016/j.joei.2016.02.004.
[17] M.R.J. Charest, Ö.L. Gülder, and C.P.T. Groth. Numerical and experimental study of soot formation in laminar diffusion flames burning simulated biogas fuels at elevated pressures. Combustion and Flame, 161(10):2678–2691, 2014. doi: 10.1016/j.combustflame.2014.04.012.
[18] H.M. Nicholson and J.P. Field. Some experimental techniques for the investigation of the mechanism of the flame stabilization in the wakes of bluff bodies. Symposium on Combustion and Flame, and Explosion Phenomena, 3(1):44–68, 1948. doi: 10.1016/S1062-2896(49)0008-0.
[19] G.C. Williams and C.W. Shipman. Some properties of rod-stabilized flames C homogenous gas mixtures. Symposium (International) on Combustion, 4(1):733-742, 1953. doi: 10.1016/S0082-0784(53)80096-2.
[20] G.C. Williams, P.T. Woo, and C.W. Shipman. Boundary layer effects on stability characteristics of bluff-body flame holders. Symposium (International) on Combustion, 6(1):427–438, 1957. doi: 10.1016/S0082-0784(57)80058-7.
[21] E.E. Zukoski, and F.E. Marble. Experimental concerning the mechanism of flame blowoff from bluff bodies. Proceedings of the Gas Dynamics Symposium on Aerothermochemistry, 205-210, 1956.
[22] E.E. Zukoski. Flame stabilization on bluff bodies at low and intermediate Reynolds numbers. Ph.D Thesis, California Institute of Technology, Pasadena, United States of America, 1954. doi: 10.7907/E9V0-GM76.
[23] T. Maxworthy. On the mechanism of bluff body flame stabilization at low velocities. Combustion and Flame, 6:233–244, 1962. doi: 10.1016/0010-2180(62)90101-3.
[24] S.I. Cheng and A.A. Kovitz. Theory of flame stabilization by a bluff body. Symposium (International) on Combustion, 7(1):681–691, 1958. doi: 10.1016/S0082-0784(58)80109-5.
[25] A.A. Kovitz and H.-M Fu. On bluff body flame stabilization. Applied Scientific Research, 10:315–334, 1961. doi: 10.1007/BF00411927.
[26] C.-H. Chen and J.S. T’ien. Diffusion flame stabilization at the leading edge of fuel plate. Combustion Science and Technology, 50(4-6):283–306, 1986. doi: 10.1080/00102208608923938.
[27] T. Rohmat, H. Katoh, T. Obara, T. Yoshihashi, and S. Ohyagi. Diffusion flame stabilized on a porous plate in a parallel airstream. AIAA Journal, 36(11):1945–1952, 1998. doi: 10.2514/2.300.
[28] E.D. Gopalakrishnan and V. Raghavan. Numerical investigation of laminar diffusion flames established on a horizontal flat plate in a parallel air stream. International Journal of Spray and Combustion Dynamics, 3(2):161–190, 2011. doi: 10.1260/1756-8277.3.2.161.
[29] P.K. Shijin, S. Soma Sundaram, V. Raghavan, and V. Babu. Numerical investigation of laminar cross flow non-premixed flames in the presence of a bluff-body. Combustion Theory and Modelling, 18(6):692–710, 2014. doi: 10.1080/13647830.2014.967725.
[30] P.K. Shijin, V. Raghavan, and V. Babu. Numerical investigation of flame-vortex interactions in cross flow non-premixed flames in the presence of bluff bodies. Combustion Theory and Modelling, 20(4):683–706, 2016. doi: 10.1080/13647830.2016.1168942.
[31] P.K. Shijin, A. Babu, and V. Raghavan. Experimental study of bluff body stabilized laminar reactive boundary layers. International Journal of Heat and Mass Transfer, 102:219–225, 2016. doi: 10.1016/j.ijheatmasstransfer.2016.06.028.
[32] A. Harish, H.R. Rakesh Ranga, A. Babu, and V. Raghavan. Experimental study of the flame characteristics and stability regimes of biogas-air cross flow non-premixed flames. Fuel, 223:334–343, 2018. doi: 10.1016/j.fuel.2018.03.055.
[33] R.A. Barlow, A.N. Karpetis, J.H. Frank, and J.-Y Chen. Scalar profiles and NO formation in laminar opposed-flow partially premixed methane/air flames. Combustion and Flame, 127(3):2102–2118, 2001. doi: 10.1016/S0010-2180(01)00313-3.
[34] T. Hirano and Y. Kanno. Aerodynamics and thermal structures of the laminar boundary layer over a flat plate with a diffusion flame. Symposium (International) on Combustion, 14(1):391–398, 1973. doi: 10.1016/S0082-0784(73)80038-4.
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Authors and Affiliations

Alagani Harish
1
ORCID: ORCID
Vasudevan Raghavan
1

  1. Indian Institute of Technology Madras, Chennai, India
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Abstract

Marc Bloch — one of the most distinguished 20th Century historians – is the author of Strange Defeat: A Statement of Evidence Written in 1940. Serving as a staff offi cer, Bloch witnessed the fall of France in 1940 from the front line. This book is so interesting from the methodological point of view, because we are presented here with a historical source created by a historian, who additionally knows how an ideal type of historical evidence ought to be written. This French historian thought that history is also written to give contemporaries lessons on how to avoid the mistakes of the past. This is an important message of Strange Defeat.

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Authors and Affiliations

Jan Pomorski

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