Dissertations / Theses on the topic 'Sand retention'
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Khaddour, Ghonwa. "Multi-scale charaterisation of the hydro-mechecanical behaviour of unsaturated sand : water retention and triaxial responses." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAI051/document.
Full textWith the recent developments of full field measurements, it has become possible to do experiments on a soil specimen, and perform measurements at different scales. This progress has allowed greater understanding for all the processes that occur within the soil, and also created better environment to observe these mechanisms in 3D. This PhD work aims to characterize water retention and hydro-mechanical behaviours of unsaturated Hostun sand at the grain scale. To achieve this goal, water retention and triaxial tests were performed and a set of experimental and image processing tools was developed and used for the two series of tests. X-ray computed tomography set up available at 3SR Laboratory in Grenoble University was used to generate 3D images of the unsaturated soil microstructure non-destructively. A developed region growing systematic technique (trinarization technique) was used to allow the separation of the phases (i.e., grains, water and air) in the 3D images, and performing different measurements at the grain scale. Porosity and degree of saturationwere measured macroscopically using the trinarized images and microscopically using a developed mapping code. The microscopic measurements were performed over an REV, whose size was determined using a developed analysis based on statistical tools. Several microscopic-discrete analyses were developed to investigate the evolution of fluid phase (water and air) with loading (suction and mechanical loading). Digital Image Correlation was performed for the two tests.To analyze water retention behaviour of Hostun sand during drying and wetting processes, a pressure plate apparatus was developed. Suction was applied using tensiometry technique. The specimen (cylindrical 1x1cm) was prepared using water pluviation technique and scanned with a resolution 7.5micron. As a result, water retention curve, surface and domains were obtained and hysteresis phenomenon and soil cohesion were analyzed at the grain scale.For the mechanical behaviour of unsaturated soils, triaxial test were performed at three conditions: saturated drained, unsaturated drained and unsaturated undrained. A triaxial apparatus that can be placed inside the x-ray cabinet was developed in order to facilitate monitoring the changes in sand microstructure and water distribution when subjecting the soil specimen to loading. The specimen (cylinder of hxd=2x1cm) was prepared using water pluviation technique (completely saturated at the beginning of the three tests), loaded then scanned with a resolution 13micron, repeatedly till reaching 21% axial strain forthe three tests.Consequently, stress-strain curves, volumetric response and deformations measurements were obtained and deformation pattern, specimen heterogeneity, cohesion and water distribution were analyzed
Forbes, Margaret G. "Phosphorus Retention and Fractionation in Masonry Sand and Light Weight Expanded Shale Used as Substrate in a Subsurface Flow Wetland." Thesis, University of North Texas, 2002. https://digital.library.unt.edu/ark:/67531/metadc3183/.
Full textHenderson, Elizabeth. "A KINETICS STUDY OF SELECTED FILTRATION MEDIA FOR NUTRIENT REMOVAL AT VARIOUS TEMPERATURES." Master's thesis, University of Central Florida, 2008. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2344.
Full textM.S.
Department of Civil and Environmental Engineering
Engineering and Computer Science
Environmental Engr MSEnvE
Rothhardt, Steffi [Verfasser], Reinhard [Akademischer Betreuer] Gaupp, and Gerd [Akademischer Betreuer] Gleixner. "Influence of the white-rot fungus Schizophyllum commune on organically coated sand grains and their heavy metal retention / Steffi Rothhardt. Gutachter: Reinhard Gaupp ; Gerd Gleixner." Jena : Thüringer Universitäts- und Landesbibliothek Jena, 2013. http://d-nb.info/1033670243/34.
Full textDikinya, Oagile. "The effects of self-filtration on saturated hydraulic conductivity in sodic sandy soils." University of Western Australia. School of Earth and Geographical Sciences, 2007. http://theses.library.uwa.edu.au/adt-WU2007.0051.
Full textEid, Naglaa Mahmoud. "Electro-kinetic concentration and retention of nitrate in sandy soil." Diss., The University of Arizona, 1995. http://hdl.handle.net/10150/187265.
Full textAlbarran, Ruth Maria, and Ranee Taechameena Sahachartsiri. "Foster parent satisfaction and retention." CSUSB ScholarWorks, 2008. https://scholarworks.lib.csusb.edu/etd-project/3399.
Full textDai, Sheng. "Natural hydrate-bearing sediments: Physical properties and characterization techniques." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/52186.
Full textEl-Tayeb, El-Sayed Mohamed. "Rétention d'alpha-oléfinésulfonates de sodium dans un sable argilo-calcaire : étude expérimentale et modélisation du transport en présence de cations divalents et d'asphalte." Vandoeuvre-les-Nancy, INPL, 1994. http://www.theses.fr/1994INPL149N.
Full textOgunniyi, Jumoke Esther. "Effects of clay and organic matter amendments on water and nutrient retention of sandy soils." Thesis, University of Warwick, 2017. http://wrap.warwick.ac.uk/101514/.
Full textLittle, Peggy Sue. "The retention of social work practitioners at Child Protective Services in San Bernardino County." CSUSB ScholarWorks, 1999. https://scholarworks.lib.csusb.edu/etd-project/1946.
Full textau, j. anderson@murdoch edu, and Jonathan Anderson. "Impacts of Amending Bauxite Residue Sands with Residue Fines for the Establishment of Vegetation on Residue Disposal Areas." Murdoch University, 2009. http://wwwlib.murdoch.edu.au/adt/browse/view/adt-MU20090831.155453.
Full textGathuka, Lincoln Waweru. "Performance of sandy soil mixed with calcium-magnesium composite as attenuation layer for geogenic contaminants." Kyoto University, 2020. http://hdl.handle.net/2433/253455.
Full textMarley, Michelle Y. "Foster Parenting...Why Not?" CSUSB ScholarWorks, 2016. https://scholarworks.lib.csusb.edu/etd/388.
Full textAl-Dossary, Saeed. "A study of the factors affecting student retention at King Saud University, Saudi Arabia : structural equation modelling and qualitative methods." Thesis, University of Stirling, 2008. http://hdl.handle.net/1893/691.
Full textGérard-Marchant, Pierre. "Caractérisation hydro-dynamique des transferts d'eau en conditions non saturées dans un milieu déformable à faible perméabilité : application aux matériaux de centre de stockage de déchets." Université Joseph Fourier (Grenoble), 1998. http://www.theses.fr/1998GRE10155.
Full textPanori, Sheila Ann. "The effect of attention-deficit hyperactivity symptoms on well-being in college students: Implications for academic achievement and retention." CSUSB ScholarWorks, 1997. https://scholarworks.lib.csusb.edu/etd-project/1334.
Full textRasheed, Ashraf Saad [Verfasser], and Andreas [Akademischer Betreuer] Seubert. "Influence of capacity on the retention characteristics in Zwitter Ion Chromatography (ZIC) and ZIC-Hydrophilic Interaction Chromatography (HILIC) onfour different sulfobetaine stationary phases / Ashraf Saad Rasheed. Betreuer: Andreas Seubert." Marburg : Philipps-Universität Marburg, 2015. http://d-nb.info/1064976379/34.
Full textRonzier, Elisabeth. "Le gage sans dépossession : éclairages américains pour une meilleure efficacité du droit français et international." Thesis, Paris 11, 2014. http://www.theses.fr/2014PA111013.
Full textOn March 23rd 2006, the French reform of security law introduced the « gage sans dépossession », inspired by the security interest of the Article 9 of the U.C.C. from the United- States, in order to improve the efficiency of security law in France. The enhancement is undeniable and yet but there remains room for improvement.First of all, the increased autonomy given to parties when creating and ruling a security results in its detachment from the scope of personal property. Indeed, the creditor is more entitled to the value of the collateral rather than to the good itself. Therefore, the physical content of the collateral should be allowed to change physically as long as collateral remains of same value. On the other hand, the creditor’s fictive right of retention must be enforceable against insolvency proceedings. Secondly, both the detachment of the security from its physical collateral and the preponderance of parties’ autonomy must be taken into account in international private law. Should a matter of choice of law arise, the security should be governed not by lex rei sitae, given the issues raised when applied to movable goods, but by lex contractus, on account of the contractual source of the security. As a result of its adaptability enabled by autonomy, and as a result of the ability to move the security over borders and still be enforceable, the French “gage sans dépossession” appears to be more efficient both in France and on an international level
Litman, Stephanie Gail. "Liquid retention and radial distribution in coarse sand for on-site wastewater treatment systems." 1995. http://catalog.hathitrust.org/api/volumes/oclc/33147864.html.
Full textTypescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 49-52).
Frimpong, Justice Okona. "Soil hydraulic and salinity restrictions to water availability in very sandy soils." Thesis, 2017. http://hdl.handle.net/2440/106798.
Full textThesis (M.Phil.) -- University of Adelaide, School of Agriculture, Food and Wine, 2017
"Infiltration and Drainage through Coarse Layered Soil: A Study of Natural and Reclaimed Soil Profiles in the Oil Sands Region, Alberta, Canada." Thesis, 2014. http://hdl.handle.net/10388/ETD-2014-04-1487.
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