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Jun Suda - One of the best experts on this subject based on the ideXlab platform.
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accurate method for estimating hole trap concentration in n type gan via minority carrier transient spectroscopy
Applied Physics Express, 2018Co-Authors: Kazutaka Kanegae, Tsunenobu Kimoto, Jun Suda, Masahiro HoritaAbstract:We propose an analysis method for the accurate estimation of the hole trap (H1, E V + 0.85 eV) concentration in n-type GaN via minority carrier transient spectroscopy (MCTS). The proposed method considers both the hole occupation during a filling (current Injection) Period and the quick carrier recombination via the hole traps near the depletion layer edge immediately after a reverse bias is applied. The reverse bias voltage dependence of the MCTS spectrum indicates that an accurate trap concentration, as well as the hole diffusion length and electron capture cross section of the hole trap, can be determined.
F. Renard - One of the best experts on this subject based on the ideXlab platform.
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Growth of Nanosized Calcite through Gas−Solid Carbonation of Nanosized Portlandite under Anisobaric Conditions
Crystal Growth & Design, 2010Co-Authors: G. Montes-hernandez, D. Daval, R. Chiriac, F. RenardAbstract:The gas−solid carbonation of nanosized portlandite was experimentally investigated using a static bed reactor under anisobaric conditions. The effects of initial CO2 pressure (10−40 bar), reaction temperature (30 and 60 °C), and relative humidity were investigated. Three steps of the carbonation process were determined: (1) instantaneous CO2 mineralization during CO2 Injection Period. From 25 to 40 wt % of initial portlandite grains were transformed into calcite during the CO2 Injection Period (from 0.9 to 2 min). (2) Fast CO2 mineralization after gas Injection Period ( 95%). For this case, the mineralization of CO2 does not form a protective carbonate layer around the reacting particles of portlandite as typically observed by other gas−solid carbonation methods. This method could be efficiently performed to produce nanosized calcite. Moreover, the separation of calcite particles from the fluid phase is most simple compared with precipitation methods. A kinetic pseudo-second-order model was satisfactorily used to describe the three CO2 mineralization steps except for the carbonation reaction initiated at 40 bar. In this latter case, a kinetic pseudo-first-order model was satisfactorily used; indicating that the slow CO2 mineralization step appears less significant during the carbonation process.
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Growth of Nanosized Calcite through Gas−Solid Carbonation of Nanosized Portlandite under Anisobaric Conditions
Crystal Growth and Design, 2010Co-Authors: G. Montes-hernandez, D. Daval, R. Chiriac, F. RenardAbstract:The gas−solid carbonation of nanosized portlandite was experimentally investigated using a static bed reactor under anisobaric conditions. The effects of initial CO2 pressure (10−40 bar), reaction temperature (30 and 60 °C), and relative humidity were investigated. Three steps of the carbonation process were determined: (1) instantaneous CO2 mineralization during CO2 Injection Period. From 25 to 40 wt % of initial portlandite grains were transformed into calcite during the CO2 Injection Period (from 0.9 to 2 min). (2) Fast CO2 mineralization after gas Injection Period (
Alessio Rucci - One of the best experts on this subject based on the ideXlab platform.
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Can we use surface uplift data for reservoir performance monitoring? A case study from In Salah, Algeria
International Journal of Greenhouse Gas Control, 2018Co-Authors: Bahman Bohloli, T.i. Bjørnarå, J. Park, Alessio RucciAbstract:Abstract This paper presents surface movement (uplift and subsidence) analysis around three CO2 Injection wells at In Salah, Algeria. Analysis of surface movement is based on the InSAR data acquired throughout the Injection Period from 2004 to 2011. This paper focuses on the detail surface deformation patterns for all three injectors throughout the Injection Period, and eventually correlates such patterns to the CO2 Injection history. Surface uplift has a higher rate in the beginning of the Injection Period but levels off later on and reaches a final uplift of about 15–22 mm above different wells. We will explore whether surface movement data can reveal signatures of Injection regime (i.e. matrix and fracture Injections) in the reservoir. Surface movement, for a few selected points at different distances from the wellhead, and the Injection pressure are plotted versus time to explore their relationship. Analysis of the plots show that surface subsidence coincide with fracture Injection for some points and at certain times whereas it coincides with matrix Injection for others. We also tried to map out possible time delay between Injection shut-in and surface subsidence. It is learned that quantification of such a delay as well as monitoring the response of surface to fracturing in the reservoir requires high resolution surface movement data. This study shows the potential of satellite survey for monitoring the Injection regime and behavior of reservoir and overburden.
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Geomechanical Assessment of Ground Surface Uplift due to CO2 Storage at In Salah, Algeria
International Workshop on Geomechanics and Energy, 2013Co-Authors: Bahman Bohloli, T.i. Bjørnarå, L. Grande, J. Park, V. Oye, D. Kühn, Alessio RucciAbstract:This work presents an analysis of surface uplift above three Injection wells at the In Salah (Algeria) and correlates the surface uplift to geomechanical processes in the reservoir. We integrate InSAR data, Injection data and microseismic events to explain the displacement response of the reservoir and overburden to CO2 storage. The InSAR data covered time Period of 2003 to 2012. Several cross sections at surface were selected around the injectors' wellheads for to analyze surface uplift. Surface displacement was then correlated to Injection and microseismic data. The maximum cumulative vertical displacement from 2009 until end of the Injection Period in (6 March 2011) was about 15 to 20 mm. The absolute uplift was largest above well KB-502, but it was about the same magnitude above the other two wells. We can conclude that i) the maximum displacement was observed in the beginning of the Injection Period and for those points located right above the Injection section, ii) surface heave shows a time delay of about 5 months relative to the Injection Period, and iii) surface uplift occurs during both matrix and fracture Injection Periods.
G. Montes-hernandez - One of the best experts on this subject based on the ideXlab platform.
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Growth of Nanosized Calcite through Gas−Solid Carbonation of Nanosized Portlandite under Anisobaric Conditions
Crystal Growth & Design, 2010Co-Authors: G. Montes-hernandez, D. Daval, R. Chiriac, F. RenardAbstract:The gas−solid carbonation of nanosized portlandite was experimentally investigated using a static bed reactor under anisobaric conditions. The effects of initial CO2 pressure (10−40 bar), reaction temperature (30 and 60 °C), and relative humidity were investigated. Three steps of the carbonation process were determined: (1) instantaneous CO2 mineralization during CO2 Injection Period. From 25 to 40 wt % of initial portlandite grains were transformed into calcite during the CO2 Injection Period (from 0.9 to 2 min). (2) Fast CO2 mineralization after gas Injection Period ( 95%). For this case, the mineralization of CO2 does not form a protective carbonate layer around the reacting particles of portlandite as typically observed by other gas−solid carbonation methods. This method could be efficiently performed to produce nanosized calcite. Moreover, the separation of calcite particles from the fluid phase is most simple compared with precipitation methods. A kinetic pseudo-second-order model was satisfactorily used to describe the three CO2 mineralization steps except for the carbonation reaction initiated at 40 bar. In this latter case, a kinetic pseudo-first-order model was satisfactorily used; indicating that the slow CO2 mineralization step appears less significant during the carbonation process.
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Growth of Nanosized Calcite through Gas−Solid Carbonation of Nanosized Portlandite under Anisobaric Conditions
Crystal Growth and Design, 2010Co-Authors: G. Montes-hernandez, D. Daval, R. Chiriac, F. RenardAbstract:The gas−solid carbonation of nanosized portlandite was experimentally investigated using a static bed reactor under anisobaric conditions. The effects of initial CO2 pressure (10−40 bar), reaction temperature (30 and 60 °C), and relative humidity were investigated. Three steps of the carbonation process were determined: (1) instantaneous CO2 mineralization during CO2 Injection Period. From 25 to 40 wt % of initial portlandite grains were transformed into calcite during the CO2 Injection Period (from 0.9 to 2 min). (2) Fast CO2 mineralization after gas Injection Period (
Kazutaka Kanegae - One of the best experts on this subject based on the ideXlab platform.
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accurate method for estimating hole trap concentration in n type gan via minority carrier transient spectroscopy
Applied Physics Express, 2018Co-Authors: Kazutaka Kanegae, Tsunenobu Kimoto, Jun Suda, Masahiro HoritaAbstract:We propose an analysis method for the accurate estimation of the hole trap (H1, E V + 0.85 eV) concentration in n-type GaN via minority carrier transient spectroscopy (MCTS). The proposed method considers both the hole occupation during a filling (current Injection) Period and the quick carrier recombination via the hole traps near the depletion layer edge immediately after a reverse bias is applied. The reverse bias voltage dependence of the MCTS spectrum indicates that an accurate trap concentration, as well as the hole diffusion length and electron capture cross section of the hole trap, can be determined.
