Vitenskapelig artikkel

• Stavland, Stian Husevik; Tjugum, Stein-Arild; Hallanger, Anders et al. (2024). Characterization of multiphase flow through Venturi nozzle using gamma-ray tomography. (ekstern lenke)
• Stavland, Stian Husevik; Prieto, Yessica Alexandra Arellano; Hunt, Andy et al. (2020). Multimodal Two-Phase Flow Measurement Using Dual Plane ECT and GRT. (ekstern lenke)
• Stavland, Stian Husevik; Sætre, Camilla; Hjertaker, Bjørn Tore et al. (2019). Gas fraction measurements using single and dual beam gamma-densitometry for two phase gas-liquid pipe flow. (ekstern lenke)
• Hjertaker, Bjørn Tore; Tjugum, Stein-Arild; Hallanger, Anders et al. (2018). Characterization of multiphase flow blind-T mixing using high speed gamma-ray tomometry. (ekstern lenke)
• Hjertaker, Bjørn Tore; Maad, Rachid; Johansen, Geir Anton (2011). Dual-mode capacitance and gamma-ray tomography using the Landweber reconstruction algorithm. (ekstern lenke)
• Mosorov, V.; Johansen, Geir Anton; Maad, Rachid et al. (2011). Monte Carlo simulation for multi-channel gamma-ray process tomography. (ekstern lenke)
• Maad, Rachid; Hjertaker, Bjørn Tore; Johansen, Geir Anton et al. (2010). Dynamic characterization of a high speed gamma-ray tomograph. (ekstern lenke)
• Maad, Rachid; Johansen, Geir Anton (2008). Experimental analysis of high-speed gamma-ray tomography performance. (ekstern lenke)
• Hjertaker, Bjørn Tore; Maad, Rachid; Schuster, Erik et al. (2008). A data acquisition and control system for high-speed gamma-ray tomography. (ekstern lenke)
• Maad, Rachid; Hjertaker, Bjørn Tore; Johansen, Geir Anton (2008). Semi-empirical scatter correction model for high-speed gamma-ray tomography. (ekstern lenke)

Vitenskapelig Kapittel/Artikkel/Konferanseartikkel

• Stavland, Stian Husevik; Prieto, Yessica Alexandra Arellano; Hunt, Andy et al. (2020). Multimodal analysis of gas-oil intermittent structures in co-current horizontal flow. (ekstern lenke)

Vitenskapelig foredrag

• Stavland, Stian Husevik; Tjugum, Stein-Arild; Hallanger, Anders et al. (2018). Investigation of Venturi constriction characteristics in multiphase flow using high speed gamma-ray tomography. (ekstern lenke)
• Maad, Rachid; Tjugum, Stein-Arild; Hallanger, Anders et al. (2016). Investigation of multiphase flow blind-T mixing effectiveness using high speed gamma-ray tomometry. (ekstern lenke)
• Johansen, Geir Anton; Meric, Ilker; Maad, Rachid et al. (2014). Non-destructive monitoring of multiphase hydrocarbon flow by high-speed gamma-ray tomography. (ekstern lenke)
• Hjertaker, Bjørn Tore; Maad, Rachid; Johansen, Geir Anton (2012). Inherent dual mode single energy gamma-ray tomography. (ekstern lenke)
• Melo, Silvio; Moreira, Icaro; Dantas, Carlos et al. (2012). The particle system iterative reconstruction technique in a high speed gamma-ray tomograph. (ekstern lenke)
• Johansen, Geir Anton; Hjertaker, Bjørn Tore; Tjugum, Stein Arild et al. (2012). Industrial applications of tomographic gamma-ray methods. (ekstern lenke)
• Maad, Rachid; Hjertaker, Bjørn Tore; Johansen, Geir Anton et al. (2010). Dynamic characterization of a high speed gamma-ray tomograph. (ekstern lenke)
• Hjertaker, Bjørn Tore; Maad, Rachid; Johansen, Geir Anton (2010). Static characterization of dual mode capacitance and gamma-ray tomography using the Landweber reconstruction algorithm. (ekstern lenke)
• Maad, Rachid; Hjertaker, Bjørn Tore; Johansen, Geir Anton (2007). Semi-empirical Scatter Correction Models for High-Speed Gamma-Ray Tomography. (ekstern lenke)
• Maad, Rachid; Mosorov, Volodymyr; Johansen, Geir Anton (2007). Comparing Analysis of Image Visualisation Accuracy of Electrical Capacitance Tomography and Gamma Tomography. (ekstern lenke)
• Maad, Rachid; Hjertaker, Bjørn Tore; Johansen, Geir Anton (2007). Semi-empirical scatter correction models for high speed gamma-ray tomography. (ekstern lenke)
• Mosorov, Volodymyr; Maad, Rachid; Johansen, Geir Anton (2007). EXPERIMENTAL TEST OF A NOVEL RECONSTRUCTION APPROACH BASED ON IRREGULAR GRID FOR HIGH-SPEED GAMMA-RAY TOMOGRAPHY. (ekstern lenke)
• Hjertaker, Bjørn Tore; Maad, Rachid; Johansen, Geir Anton (2007). USB-based data acquisition and control system for high speed gamma-ray tomography. (ekstern lenke)
• Maad, Rachid; Sankowski, D.; Grudzien, K. et al. (2007). Comparing Analysis of Image Visualisation Accuracy of Electrical Capacitance Tomography and Gamma Tomography. (ekstern lenke)
• Mosorov, V.; Maad, Rachid; Lewndowski, S. et al. (2007). EXPERIMENTAL TEST OF A NOVEL RECONSTRUCTION APPROACH BASED ON IRREGULAR GRID FOR HIGH-SPEED GAMMA-RAY TOMOGRAPHY. (ekstern lenke)
• Hjertaker, Bjørn Tore; Maad, Rachid; Almås, Ole Andreas et al. (2007). USB-based Data Acquisition and Control System for High Speed Gamma-ray Tomography. (ekstern lenke)
• Maad, Rachid; Johansen, Geir Anton (2006). Experimental noise analysis of reconstructed pixel values in high-speed gamma-ray tomography. (ekstern lenke)
• Maad, Rachid; Johansen, Geir Anton (2006). Experimental noise analysis of reconstructed pixel values in high-speed gamma-ray tomography. (ekstern lenke)
• Hjertaker, Bjørn Tore; Johansen, Geir Anton; Cimpan, Emil et al. (2005). First experimental results of multiphase hydrocarbon flow monitoring using dual modality gamma-ray tomography and high frequency magnetic field sensors. (ekstern lenke)
• Maad, Rachid; Johansen, Geir Anton (2003). Automatic weight matrix generation for gamma-ray tomography. (ekstern lenke)
• Maad, Rachid; Johansen, Geir Anton (2003). Automatic weight matrix generation for gamma-ray tomography. (ekstern lenke)

Poster

• Tjugum, Stein-Arild; Hjertaker, Bjørn Tore; Maad, Rachid et al. (2016). Investigation of Multiphase Flow-Regimes After a Blind-T Mixer and at the Throat of the Venturi – Using Gamma-Ray Tomography and CFD Modelling. (ekstern lenke)

Doktorgradsavhandling

• Maad, Rachid; Johansen, Geir Anton (2009). Design optimization of high speed gamma-ray tomography. (ekstern lenke)

Rapport

• Johansen, Geir Anton; Legoupil, Samuel; Fernandez, Miryan Cassanello et al. (2008). Industrial Process Gamma Tomography. (ekstern lenke)

Se en full oversikt over publikasjoner i Cristin

• Multimodal Two-Phase Flow Measurement Using Dual Plane ECT and GRT. Stavland, Stian Husevik; Arellano Prieto, Yessica Alexandra; Hunt, Andy; Maad, Rachid; Hjertaker, Bjørn Tore. 2020. IEEE Transactions on Instrumentation and Measurement.

• Multimodal analysis of gas-oil intermittent structures in co-current horizontal flow. Stavland, Stian Husevik; Arellano Prieto, Yessica Alexandra; Hunt, Andy; Maad, Rachid; Hjertaker, Bjørn Tore. 2020. IEEE International Instrumentation and Measurement Technology Conference.

• Gas fraction measurements using single and dual beam gamma-densitometry for two phase gas-liquid pipe flow. Stavland, Stian Husevik; Sætre, Camilla; Hjertaker, Bjørn Tore; Tjugum, Stein-Arild; Hallanger, Anders; Maad, Rachid. 2019.  IEEE Instrumentation and Measurement Technology Conference. Proceedings. 1-6.

• Characterization of multiphase flow blind-T mixing using high speed gamma-ray tomometry, B. T. Hjertaker, S.A. Tjugum, A. Hallanger, R. Maad, 2018, Flow Measurement and Instrumentation, Flow Measurement and Instrumentation 62 (2018) 205–212.

• Investigation of venture constriction characteristics in multiphase flow using high speed gamma-ray tomography, S. H. Stavland, S-A. Tjugum , A. Hallanger , R. Maad  and B. T. Hjertaker, 9^th World Congress on Industrial Process Tomography, 2018, Bath, England.

• Non-linearity in monochromatic transmission tomography, W. Lionheart1, B. T. Hjertaker, R. Maad, I. Meric, S. B. Coban, and G. A. Johansen http://arxiv.org/pdf/1705.05160

• Investigation of multiphase flow blind-T mixing effectiveness using high speed gamma-ray tomometry, R. Maad, S. A. Tjugum, A. Hallanger, B. T. Hjertaker, 2016, 8th World Congress on Industrial Process Tomography, Brazil.

• Non-Destructive Monitoring of Multiphase Hydrocarbon Flow by High-Speed Gamma-Ray Tomography, G. A. Johansen , I. MERIC , R. Maad , E. M. Bruvik, B. T.Hjertaker , C. Sætre, 2014, 11th European Conference on Non-Destructive Testing (ECNDT 2014).

• The particle system iterative reconstruction technique in a high speed Gamma-ray Tomograph, S. Melo, Í. Moreira, C. Dantas, G. A. Johansen, B. T. Hjertaker and R. Maad, 6^th International Symposium on Process Tomography, 2012, Cape Town, South Africa.

• Industrial applications of tomographic gamma-ray methods, G. A. Johansen, B. T. Hjertaker, S. A. Tjugum, E. M .Bruvik, R. Maad, C. Sætre, and R. Thorn, 6^th International Symposium on Process Tomography, 2012, Cape Town, South Africa.

• Inherent dual mode single energy gamma-ray tomography, B. T. Hjertaker, R. Maad and G. A. Johansen, 6^th International Symposium on Process Tomography, 2012, Cape Town, South Africa.

• Dual-mode capacitance and gamma-ray tomography using the Landweber reconstruction algorithm, B. T. Hjertaker, R. Maad and G. A. Johansen, Measurement science and technology 22 (2011), 104002.

• Monte Carlo simulation for multi-channel gamma-ray process tomography, V Mosorov, G A Johansen, R Maad and D Sankowski, Flow Measurement and Instrumentation 22 (2011) 055502.

• Dynamic characterization of high speed gamma-ray tomography, R. Maad, B. T. Hjertaker, G. A. Johansen and Ø. Olsen, Flow Measurement and Instrumentation 21 (2010) 538–545.

• Experimental analysis of high-speed gamma-ray tomography performance, R. Maad and G. A. Johansen, Measurement science and technology 19 (2008), 085502.

• Semi-empirical scatter correction model for high speed gamma-ray tomography, R. Maad, B. T. Hjertaker and G. A. Johansen, Measurement science and technology 19 (2008), 094016.

• A data acquisition and control system for high-speed gamma-ray tomography, B. T. Hjertaker, R. Maad, E. Schuster, O. A. Almås and G. A. Johansen, Measurement science and technology 19 (2008), 094012.

• Convergence acceleration of the alternating minimization algorithm for high-speed gamma-ray tomography, R. Maad and G. A. Johansen, 5^th International Symposium on Process Tomography, 2008, Zakopane, Poland.

• Semi-empirical scatter correction models for high speed gamma-ray tomography, R. Maad, B. T. Hjertaker and G. A. Johansen, Proceedings of the 5^th World Congress on Industrial Process Tomography (ISBN 978 0 85316 265 0), 2007, Bergen, Norway.

• A Comparing Analysis of Image Visualisation Accuracy of Electrical Capacitance Tomography and Gamma Tomography, R. Maad, D. Sankowski, K. Grudzien, R. Wajman, V. Mosorov and G. A. Johansen, Proceedings of the 5^th  World Congress on Industrial Process Tomography (ISBN 978 0 85316 265 0), 2007, Bergen, Norway.

• Experimental test of a novel reconstruction approach based on irregular grid for high speed gamma-ray tomography, V. Mosorov, R. Maad, S.Lewndowski, G. A. Johansen and D. Sankowski, Proceedings of the 5^th World Congress on Industrial Process Tomography (ISBN 978 0 85316 265 0), 2007, Bergen, Norway.

• USB-based data acquisition and control system for high speed gamma-ray tomography, B. T. Hjertaker, R. Maad, O. A. Almås and G. A. Johansen, Proceedings of the 5^th World Congress on Industrial Process Tomography (ISBN 978 0 85316 265 0), 2007, Bergen, Norway.

• Experimental noise analysis of reconstructed pixel values in high-speed gamma-ray tomography. R. Maad and G. A. Johansen, 4^th International Symposium on Process Tomography, 2006, Warsaw, Poland.

• First experimental results of multiphase hydrocarbon flow monitoring using dual modality gamma-Ray tomography and high frequency magnetic field sensors, B. T. Hjertaker, G. A. Johansen, E. Cimpan, R. Maad, and E. A. Hammer, 4^th World Congress on Industrial Process Tomography, 2005, Aizu, Japan.

• Automatic Weight Matrix Generation for Gamma-ray Tomography, R. Maad and G. A. Johansen, 3^rd World Congress on Industrial Process Tomography, 2003, Banff, Canada.