scholarly journals CO2 migration in saline aquifers. Part 1. Capillary trapping under slope and groundwater flow

2010 ◽  
Vol 662 ◽  
pp. 329-351 ◽  
Author(s):  
C. W. MACMINN ◽  
M. L. SZULCZEWSKI ◽  
R. JUANES
Keyword(s):  
Groundwater Flow ◽  
Complete Solution ◽  
Specific Capacity ◽  
Trapping Efficiency ◽  
Storage Efficiency ◽  
Capillary Trapping ◽  
Promising Tool ◽  
Plume Migration ◽  
And Migration ◽  
The Impact

Injection of carbon dioxide (CO2) into geological formations is widely regarded as a promising tool for reducing global atmospheric CO2 emissions. To evaluate injection scenarios, estimate reservoir capacity and assess leakage risks, an accurate understanding of the subsurface spreading and migration of the plume of mobile CO2 is essential. Here, we present a complete solution to a theoretical model for the subsurface migration of a plume of CO2 due to natural groundwater flow and aquifer slope, and subject to residual trapping. The results show that the interplay of these effects leads to non-trivial behaviour in terms of trapping efficiency. The analytical nature of the solution offers insight into the physics of CO2 migration, and allows for rapid, basin-specific capacity estimation. We use the solution to explore the parameter space via the storage efficiency, a macroscopic measure of plume migration. In a future study, we shall incorporate CO2 dissolution into the migration model and study the importance of dissolution relative to capillary trapping and the impact of dissolution on the storage efficiency.

scholarly journals CO2 migration in saline aquifers. Part 2. Capillary and solubility trapping

2011 ◽  
Vol 688 ◽  
pp. 321-351 ◽  
Author(s):  
C. W. MacMinn ◽  
M. L. Szulczewski ◽  
R. Juanes
Keyword(s):  
Large Scale ◽  
Complete Solution ◽  
Saline Aquifers ◽  
Buoyant Plume ◽  
Storage Efficiency ◽  
Capillary Trapping ◽  
Sloping Aquifer ◽  
Promising Tool ◽  
Solubility Trapping ◽  
The Impact

AbstractThe large-scale injection of carbon dioxide (CO2) into saline aquifers is a promising tool for reducing atmospheric CO2 emissions to mitigate climate change. An accurate assessment of the post-injection migration and trapping of the buoyant plume of CO2 is essential for estimates of storage capacity and security, but these physical processes are not fully understood. In Part 1 of this series, we presented a complete solution to a theoretical model for the migration and capillary trapping of a plume of CO2 in a confined, sloping aquifer with a natural groundwater through-flow. Here, we incorporate solubility trapping, where CO2 from the buoyant plume dissolves into the ambient brine via convective mixing. We develop semi-analytical solutions to the model in two limiting cases: when the water beneath the plume saturates with dissolved CO2 very slowly or very quickly (‘instantaneously’) relative to plume motion. We show that solubility trapping can greatly slow the speed at which the plume advances, and we derive an explicit analytical expression for the position of the nose of the plume as a function of time. We then study the competition between capillary and solubility trapping, and the impact of solubility trapping on the storage efficiency, a macroscopic measure of plume migration. We show that solubility trapping can increase the storage efficiency by several-fold, even when the fraction of CO2 trapped by solubility trapping is small.

Effect of the number of water alternating CO2 injection cycles on CO2 trapping capacity

2019 ◽  
Vol 59 (1) ◽  
pp. 357 ◽  
Author(s):  
Emad A. Al-Khdheeawi ◽  
Stephanie Vialle ◽  
Ahmed Barifcani ◽  
Mohammad Sarmadivaleh ◽  
Stefan Iglauer
Keyword(s):  
Storage Capacity ◽  
Co2 Storage ◽  
Storage Period ◽  
Co2 Injection ◽  
Co2 Leakage ◽  
Storage Efficiency ◽  
Reservoir Model ◽  
Plume Migration ◽  
The Impact ◽  
Injection Cycle

The CO2 storage capacity is greatly affected by CO2 injection scenario – i.e. water alternating CO2 (WACO2) injection, intermittent injection, and continuous CO2 injection – and WACO2 injection strongly improves the CO2 trapping capacity. However, the impact of the number of WACO2 injection cycles on CO2 trapping capacity is not clearly understood. Thus, we developed a 3D reservoir model to simulate WACO2 injection in deep reservoirs testing different numbers of WACO2 injection cycles (i.e. one, two, and three), and the associated CO2 trapping capacity and CO2 plume migration were predicted. For all different WACO2 injection cycle scenarios, 5000 kton of CO2 and 5000 kton of water were injected at a depth of 2275m and 2125m respectively, during a 10-year injection period. Then, a 100-year CO2 storage period was simulated. Our simulation results clearly showed, after 100 years of storage, that the number of WACO2 cycles affected the vertical CO2 leakage and the capacity of trapped CO2. The results showed that increasing the number of WACO2 cycles decreased the vertical CO2 leakage. Furthermore, a higher number of WACO2 cycles increased residual trapping, and reduced solubility trapping. Thus, the number of WACO2 cycles significantly affected CO2 storage efficiency, and higher numbers of WACO2 cycles improved CO2 storage capacity.

Syrian Crisis and Migration

2015 ◽  
Vol 12 (3) ◽  
pp. 181-192 ◽  
Author(s):  
Pinar Yazgan ◽  
Deniz Eroglu Utku ◽  
Ibrahim Sirkeci
Keyword(s):  
Human Mobility ◽  
Special Issue ◽  
Host Countries ◽  
Syrian Crisis ◽  
Mass Migration ◽  
Large Numbers ◽  
And Migration ◽  
Europe Today ◽  
The Impact ◽  
Near Future

With the growing insurrections in Syria in 2011, an exodus in large numbers have emerged. The turmoil and violence have caused mass migration to destinations both within the region and beyond. The current "refugee crisis" has escalated sharply and its impact is widening from neighbouring countries toward Europe. Today, the Syrian crisis is the major cause for an increase in displacement and the resultant dire humanitarian situation in the region. Since the conflict shows no signs of abating in the near future, there is a constant increase in the number of Syrians fleeing their homes. However, questions on the future impact of the Syrian crisis on the scope and scale of this human mobility are still to be answered. As the impact of the Syrian crisis on host countries increases, so does the demand for the analyses of the needs for development and protection in these countries. In this special issue, we aim to bring together a number of studies examining and discussing human mobility in relation to the Syrian crisis.

Race, Gender, and Border Control in the Western Balkans

2018 ◽  
Author(s):  
Sanja Milivojević
Keyword(s):  
Knowledge Production ◽  
Asylum Seekers ◽  
Former Yugoslavia ◽  
Border Control ◽  
Western Balkans ◽  
Irregular Migrants ◽  
Criminological Inquiry ◽  
Gender And Migration ◽  
And Migration ◽  
The Impact

This chapter looks at the intersection of race, gender, and migration in the Western Balkans. Immobilizing mobile bodies from the Global South has increasingly been the focus of criminological inquiry. Such inquiry, however, has largely excluded the Western Balkans. A difficult place to research, comprising countries of the former Yugoslavia and Albania, the region is the second-largest route for irregular migrants in Europe (Frontex 2016). Indeed, EU expansion and global developments such as wars in Syria, Afghanistan, and Iraq have had a major impact on mobility and migration in the region. The chapter outlines racialized hierarchies in play in contemporary border policing in the region, and how these racialized and gendered practices target racially different Others and women irregular migrants and asylum seekers. Finally, this chapter maps the impact of such practices and calls for a shift in knowledge production in documenting and addressing such discriminatory practices.

scholarly journals Fermentation as a Tool to Revitalise Brewers’ Spent Grain and Elevate Techno-Functional Properties and Nutritional Value in High Fibre Bread

Foods ◽  
2021 ◽  
Vol 10 (7) ◽  
pp. 1639
Author(s):  
Emma Neylon ◽  
Elke K. Arendt ◽  
Emanuele Zannini ◽  
Aylin W. Sahin
Keyword(s):  
Functional Properties ◽  
Nutritional Value ◽  
Bread Quality ◽  
Wheat Bread ◽  
Promising Tool ◽  
Additional Processing ◽  
Spent Grain ◽  
The Impact ◽  
Over Time

Recycling of by-products from the food industry has become a central part of research to help create a more sustainable future. Brewers’ spent grain is one of the main side-streams of the brewing industry, rich in protein and fibre. Its inclusion in bread, however, has been challenging and requires additional processing. Fermentation represents a promising tool to elevate ingredient functionality and improve bread quality. Wheat bread was fortified with spray-dried brewers’ spent grain (BSG) and fermented brewers’ spent grain (FBSG) at two addition levels to achieve “source of fibre” and “high in fibre” claims according to EU regulations. The impact of BSG and FBSG on bread dough, final bread quality and nutritional value was investigated and compared to baker’s flour (BF) and wholemeal flour (WMF) breads. The inclusion of BSG and FBSG resulted in a stronger and faster gluten development; reduced starch pasting capacity; and increased dough resistance/stiffness. However, fermentation improved bread characteristics resulting in increased specific volume, reduced crumb hardness and restricted microbial growth rate over time. Additionally, the inclusion of FBSG slowed the release in reducing sugars over time during in vitro starch digestion. Thus, fermentation of BSG can ameliorate bread techno-functional properties and improve nutritional quality of breads.

scholarly journals Controlled Nanostructuration of Cobalt Oxyhydroxide Electrode Material for Hybrid Supercapacitors

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2325
Author(s):  
Ronan Invernizzi ◽  
Liliane Guerlou-Demourgues ◽  
François Weill ◽  
Alexia Lemoine ◽  
Marie-Anne Dourges ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Energy Storage ◽  
Specific Surface ◽  
Electrode Materials ◽  
Specific Capacity ◽  
Hybrid Supercapacitors ◽  
Cobalt Oxyhydroxide ◽  
Precipitation Medium ◽  
The Impact

Nanostructuration is one of the most promising strategies to develop performant electrode materials for energy storage devices, such as hybrid supercapacitors. In this work, we studied the influence of precipitation medium and the use of a series of 1-alkyl-3-methylimidazolium bromide ionic liquids for the nanostructuration of β(III) cobalt oxyhydroxides. Then, the effect of the nanostructuration and the impact of the different ionic liquids used during synthesis were investigated in terms of energy storage performances. First, we demonstrated that forward precipitation, in a cobalt-rich medium, leads to smaller particles with higher specific surface areas (SSA) and an enhanced mesoporosity. Introduction of ionic liquids (ILs) in the precipitation medium further strongly increased the specific surface area and the mesoporosity to achieve well-nanostructured materials with a very high SSA of 265 m2/g and porosity of 0.43 cm3/g. Additionally, we showed that ILs used as surfactant and template also functionalize the nanomaterial surface, leading to a beneficial synergy between the highly ionic conductive IL and the cobalt oxyhydroxide, which lowers the resistance charge transfer and improves the specific capacity. The nature of the ionic liquid had an important influence on the final electrochemical properties and the best performances were reached with the ionic liquid containing the longest alkyl chain.

Can prism adaptation effects generalize to wheelchair maneuvering?

2021 ◽  
pp. 1-10
Author(s):  
Lindsay E. Wyatt ◽  
Anne Sophie Champod ◽  
Gabrielle M. Haidar ◽  
Gail A. Eskes
Keyword(s):  
Standard Treatment ◽  
Clinical Care ◽  
Prism Adaptation ◽  
Spatial Neglect ◽  
Hand Position ◽  
Everyday Activity ◽  
After Effects ◽  
Everyday Activities ◽  
Promising Tool ◽  
The Impact

BACKGROUND: While prism adaptation (PA) has been recognized as a promising tool for treating spatial neglect, implementation as a standard treatment in clinical care has been lagging. Limited evidence for the generalization of after-effects to everyday activities has been a barrier towards implementation. OBJECTIVES: This study examined whether a home-friendly standardized PA protocol (Peg-the-Mole, PTM) induces after-effects that can transfer to wheelchair maneuvering. We also examined the impact of using constant (1 starting hand position) or variable (3 starting hand positions) training conditions on the transfer of after-effects to wheelchair maneuvering. METHODS: Sixty participants were randomly assigned to one of four PTM conditions: 1) prisms/constant training; 2) prisms/variable training; 3) sham goggles/constant training; 4) sham goggles/variable training. RESULTS: The use of PTM with rightward shifting prisms induced after-effects on proprioceptive and visual pointing outcome tasks. Groups using PTM with prism goggles showed a leftward shift in their position within a wheelchair course and a reduction in the number of right-sided collisions. The training condition did not have an impact on the transfer of after-effects to wheelchair driving. CONCLUSION: PTM is a clinically appealing PA protocol that induces after-effects that can transfer to an everyday activity relevant to patients with neglect.

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