scholarly journals Parametric assessment of hydrochemical changes associated to underground pumped hydropower storage

2021 ◽  
Author(s):  
Estanislao Pujades
Keyword(s):  
Porous Medium ◽  
Reactive Transport ◽  
Selection Procedure ◽  
Abandoned Mines ◽  
Screening Criteria ◽  
Specific Chemical ◽  
Underground Reservoir ◽  
Surface Reservoir ◽  
Ph Variations

Underground pumped hydropower storage (UPHS) using abandoned mines is an alternative to store and produce electricity in flat regions. Excess of electricity is stored in form of potential energy by pumping mine water to a surface reservoir. When the demand of electricity increases, water is discharged into the mine (i.e., underground reservoir) through turbines producing electricity. During the complete operational process of UPHS plants, hydrochemical characteristics of water evolve continuously to be in equilibrium successively with the atmosphere (in the surface reservoir) and the surrounding porous medium (in the underground reservoir). It may lead to precipitation and/or dissolution of minerals and their associated consequences, such as pH variations. Induced hydrochemical changes may have an impact on the environment and/or the efficiency (e.g., corrosions and incrustations affect facilities) of UPHS plants. The nature of the hydrochemical changes is controlled by the specific chemical characteristics of the surrounding porous medium. However, the magnitude of the changes also depends on other variables, such as hydraulic parameters. The role of these parameters is established to define screening criteria and improve the selection procedure of abandoned mines for constructing UPHS plants.This work evaluates the role of the main hydrogeological factors for three different chemical composition of the porous medium. Results are obtained by means of numerical reactive transport modeling. Potential impacts on the environment (mainly on groundwater and surface water bodies) and on the efficiency of the UPHS plants vary considerably from a hydraulic parameter to another showing the need for a detailed characterization before choosing locations of future UPHS plants.

scholarly journals Numerical study of the Martelange mine to be used as underground reservoir for constructing an Underground Pumped Storage Hydropower plant

2018 ◽  
Vol 45 ◽  
pp. 51-56 ◽  
Author(s):  
Estanislao Pujades ◽  
Philippe Orban ◽  
Pierre Archambeau ◽  
Sebastien Erpicum ◽  
Alain Dassargues
Keyword(s):  
Numerical Study ◽  
Surrounding Medium ◽  
High Capacity ◽  
Abandoned Mines ◽  
Hydropower Plant ◽  
Underground Reservoir ◽  
Pumped Storage ◽  
Surface Reservoir ◽  
Synthetic Models

Abstract. Underground Pumped Storage Hydropower (UPSH) using abandoned mines has been considered as a potential high capacity Energy Storage Systems. In UPSH plants, the excess of electricity is stored in the form of potential energy by pumping water from an underground reservoir (abandoned mine in this paper) to a surface reservoir, while electricity is produced (when the demand increases) discharging water from the surface into the underground reservoir. The main concerns may arise from the water exchanges occurring between the underground reservoir and the surrounding medium, which are relevant in terms of environmental impact and UPSH efficiency. Although the role of the water exchanges has been previously addressed, most studies are based on synthetic models. This work focuses on a real abandoned slate mine located in Martelange (Belgium). The effects of different rehabilitation works to prepare the mine as an underground reservoir are assessed in terms of groundwater exchanges and their associated consequences.

scholarly journals Hydrochemical changes induced by underground pumped storage hydropower: influence of aquifer parameters in coal mine environments

2018 ◽  
Vol 45 ◽  
pp. 45-49
Author(s):  
Estanislao Pujades ◽  
Anna Jurado ◽  
Philippe Orban ◽  
Alain Dassargues
Keyword(s):  
Coal Mine ◽  
Numerical Models ◽  
Surrounding Medium ◽  
Abandoned Mines ◽  
System Behavior ◽  
Sulphide Minerals ◽  
Pumped Storage ◽  
Surface Reservoir ◽  
Selection Of

Abstract. Underground pumped storage hydropower (UPSH) induces hydrochemical changes when water evolves to reach equilibrium with the atmosphere (in the surface reservoir) and with the surrounding medium (in the underground reservoir). These hydrochemical changes may impact the environment and the efficiency of the system (i.e., the UPSH plant), especially in coal mine environments where the presence of sulphide minerals is common. For this reason, it is needed to assess the variables that control the behavior of the system in order to establish criteria for the selection of abandoned mines to be used as underground reservoirs in future UPSH plants. Coupled hydro-chemical numerical models are used for investigating the influence of hydraulic parameters on the hydrochemical changes when pyrite is present in the surrounding medium. Results show the role of the hydraulic conductivity and the porosity on the system behavior, which is helpful for selecting those abandoned mines where the hydrochemical changes and their associated consequences will be less.

Capillary Imbibition Dynamics in Porous Media

2014 ◽  
Author(s):  
Swayamdipta Bhaduri ◽  
Pankaj Sahu ◽  
Siddhartha Das ◽  
Aloke Kumar ◽  
Sushanta K. Mitra
Keyword(s):  
Porous Medium ◽  
Porous Media ◽  
Paper Strip ◽  
Capillary Imbibition ◽  
Flow Physics ◽  
Fundamental Understanding ◽  
Paper Based Microfluidics ◽  
To Come

The phenomenon of capillary imbibition through porous media is important both due to its applications in several disciplines as well as the involved fundamental flow physics in micro-nanoscales. In the present study, where a simple paper strip plays the role of a porous medium, we observe an extremely interesting and non-intuitive wicking or imbibition dynamics, through which we can separate water and dye particles by allowing the paper strip to come in contact with a dye solution. This result is extremely significant in the context of understanding paper-based microfluidics, and the manner in which the fundamental understanding of the capillary imbibition phenomenon in a porous medium can be used to devise a paper-based microfluidic separator.

scholarly journals The Role of Glutathione S-Transferases in Urinary Tract Tumors

2008 ◽  
Vol 27 (3) ◽  
pp. 360-366 ◽  
Author(s):  
Tatjana Simić ◽  
Ana Savić-Radojević ◽  
Marija Plješa-Ercegovac ◽  
Marija Matić ◽  
Tatjana Sašić ◽  
...  
Keyword(s):  
Urinary Tract ◽  
Urinary Bladder ◽  
Cell Carcinoma ◽  
Allelic Variation ◽  
Transitional Cell ◽  
Chemotherapy Resistance ◽  
High Recurrence Rate ◽  
Specific Chemical ◽  
Glutathione S Transferases

The Role of Glutathione S-Transferases in Urinary Tract Tumors Exposure to potential carcinogens is among the etiological factors for renal cell carcinoma (RCC) and transitional cell carcinoma (TCC) of the urinary bladder. RCC is very resistant, while TCC exhibits a high recurrence rate and multifocality. Cytosolic glutathione S-transferases (GST) are a superfamily of enzymes which protect normal cells by catalyzing conjugation reactions between electrophylic compounds, including carcinogens, and glutathione. Some GST enzymes posses hydroperoxidase activity. The most well characterized classes have been named Alpha (GSTA), Mu (GSTM), Pi (GSTP) and Theta (GSTT) and each of these classes contains several different isoenzymes. Several types of allelic variation have been identified within classes, among which GSTM1-null and GSTT1-null confer impaired catalytic activity. Individuals with the GSTM1-null genotype carry a substantially higher risk for bladder carcinogenesis. The effects of glutathione S-transferase T1 polymorphism on the increased susceptibility to RCC and TCC of urinary bladder depend on the presence of specific chemical exposures to compounds metabolized via the GSTT1-1 pathway. In the process of kidney cancerisation expression of GST alpha isoenzymes tends to decrease, consequently favoring a prooxidant environment necessary for the growth of RCC. GST pi enzyme activities are generally retained in RCC and might contribute to the chemotherapy resistance of RCC. In the malignant phenotype of TCC of the urinary bladder up regulation of various GST classes occurs. Up regulation of GSTT1-1 and GSTP1-1 might have important consequences on the tumor growth, by providing a reduced environment and inhibition of apoptotic pathways.

Het managen van rechtvaardigheidsverwachtingen van sollicitanten

2014 ◽  
Vol 27 (4) ◽  
Author(s):  
Brigitte Geenen ◽  
Karin Proost
Keyword(s):  
Test Anxiety ◽  
Selection Procedure ◽  
Peer Communication ◽  
Mediating Role ◽  
The Relationship ◽  
Moderating Role ◽  
War For Talent

Managing applicant justice expectations. A tool to win the ‘war for talent’ Managing applicant justice expectations. A tool to win the ‘war for talent’ Because of the ‘war for talent’, organizations struggle to get certain positions filled and in order to attract talent organizations have to work hard on their image as an attractive employer. Research shows that taking applicants’ justice expectations into account can help organizations to obtain a better pool of applicants. This article summarizes PhD research on antecedents and the consequences of the justice expectations that applicants have. This research addresses the moderating role of direct experiences in the relationship between applicants’ existing beliefs and their justice expectations; the mediating role of justice expectations in the relationship between peer communication about the fairness of the selection procedure and applicants’ test anxiety and motivation; and the moderating role of affect in the relationship between applicants’ justice expectations and their intentions to either recommend an organization or to litigate.

Flow of nanofluid towards a Riga surface with heat and mass transfer under the effects of activation energy and thermal radiation

2021 ◽  
pp. 2150266
Author(s):  
A. Al-Zubaidi ◽  
Mubbashar Nazeer ◽  
S. Saleem ◽  
Farooq Hussain ◽  
Fayyaz Ahmad
Keyword(s):  
Activation Energy ◽  
Boundary Layer ◽  
Mass Transfer ◽  
Porous Medium ◽  
Shooting Technique ◽  
Highly Nonlinear ◽  
Riga Plate ◽  
Buongiorno Model ◽  
Momentum Boundary Layer

This paper numerically simulates the nanofluid flow over a thermally expanding Riga plate. Buongiorno model for nanofluid is employed to investigate the contribution of Brownian motion and thermophoretic force on the nanoflow. Magnetohydrodynamics (MHD) of viscous nanofluid through a porous medium is characterized with the help of Darcy–Forchheimer’s model. In addition, the simultaneous effects of activation energy and chemical reaction have been incorporated. Moreover, highly nonlinear coupled differential equations are formulated which highlight the influence of viscous dissipation and heat generation. A numerical solution is achieved with the help of the Range–Kutta fourth-order (RK4) method combined with the shooting technique. Finally, the role of emerging parameters is studied via performing the numerical simulation which reveals that the momentum boundary layer of nanofluid shrinks due to the porous medium. Whereas, thermal boundary layer expands for all variables, except for the Prandtl number. Finally, mass transfer rated suffers due to Schmidt number.

Coping with psychosomatic symptoms: The buffering role of psychological flexibility and impact on quality of life

2016 ◽  
Vol 24 (2) ◽  
pp. 175-187 ◽  
Author(s):  
Chrysanthi Leonidou ◽  
Georgia Panayiotou ◽  
Aspasia Bati ◽  
Maria Karekla
Keyword(s):  
Quality Of Life ◽  
Negative Impact ◽  
Community Sample ◽  
Psychological Flexibility ◽  
Avoidant Coping ◽  
Screening Criteria ◽  
Illness Anxiety ◽  
The Impact

Individual differences in avoidant coping were hypothesized to exacerbate quality of life impairment associated with somatization and illness anxiety symptoms; psychological flexibility was expected to moderate this impairment. Individuals from a random community sample ( N = 298; 182 females), who met screening criteria for somatization and illness anxiety, reported lower quality of life and psychological flexibility and greater avoidant coping compared to controls. Psychological flexibility significantly moderated the impact of somatization and illness anxiety on quality of life domains. Findings suggest that decreasing avoidant coping through therapy may be promising in mitigating the negative impact of these symptom categories.

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