Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 16 of 16 for “"Salt precipitation"”.
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Microscopic study of salt precipitation dynamics during the injection process of CO2 storage in saline aquifers
… can store billions of tons of CO₂. However, salt precipitation during injection can clog pores and reduce permeability. Understanding the dynamics of this process, influenced by injection flow rate, pore structure, and brine properties, is crucial for optimizing CCUS strategies. This thesis …
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Effect of halite (NaCl) on sandstone permeability and well injectivity during CO2 storage in saline aquifers
… the near well bore formation dry out as a result salt precipitation in the form of halite (NaCl). The focus was on one of the important physical mechanisms of CO2 injection into deep saline aquifers. The salt (mainly halite) will eventually fully saturate the brine causing the salt to start …
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Kidney stone rarity in South Africa's black population : investigation of the biochemical and physico-chemical properties of Tamm Horsfall Mucoprotein as a possible contributory factor
… male subjects. THP was isolated by salt precipitation, purified by column chromatography and verified by electrophoresis on SDS-polyacrylamide gels. MALDI-TOF mass spectroscopy was used to determine the molecular weights of the protein from each group and their respective amino acids …
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Thermodynamic and transport property modeling in super critical water
… including reaction kinetics, corrosion, and salt-related phenomena and in order to develop realistic SCWO process and fluid-dynamic simulators. Understanding the phenomena in each of these areas requires accurate thermodynamic- and transport-property predictions. However, these often do not …
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Enzymatic degradation of alpha and beta cyclodextrins by bacteroides from the human colon
… from both strains occured at pH 7.0. Salt precipitation and chromatographic methods were utilized in an attempt to purify the enzyme(s) in crude cyclodextrinase. No enzymes were purified to homogeneity, but a 15- to 17-fold increase in specific cyclodextrinase activity was obtained via …
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Engineering Advanced Electrolyte and Metal Organic Framework Catalyst for Lithium Batteries
… development of a highly conductive polymer-in-salt quasi-solid-state electrolyte (PS-QSSE) and the engineering of a high-entropy metal-organic framework (MOF) cathode catalyst to significantly change the discharge reaction pathway are the two main strategies used in this dissertation to …
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Studies of proteins in the posterior lobe of the pituitary gland
… using hydrochloric acid at pH 1.2-1.6. After salt precipitation neurophysin was separated from other extracted protein by gel-exclusion chromatography on Sephadex G.75. Ion exchange chromatography on CM-sephadex C.50 using acetate buffer in a pH gradient was employed to resolve the neurophysin …
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USE OF GAS EMISSION BY BIOELECTROCHEMICAL APPROACHES FOR POWER-TO-X
… low (8.5 ± 4.9 mL L-1 d-1) due to gas leakage, salt precipitation, sulphate-reducing bacteria competition, and CO2 dosing inefficiencies, the systems achieved a Coulombic efficiency of 45 ± 13%. The results confirmed the suitability of terracotta as a porous material capable of maintaining an …
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Electroluminescence and inorganic phosphor science
… electroluminescent semiconductors and inorganic salt precipitation is combined with a unique, thin film laser processing technique known as laser induced forward transfer or direct writing (the later terminology used mostly in the case of metal films).Zinc sulfide and cadmium zinc sulfide films …
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A hydrometallurgical comparison between the caustic and sulphuric acid cracking of steenkampskraal (skk) monazite
… conversion from a sulphate into a hydroxide salt. This resulted in a CAPEX of R 13,54M as opposed to the lower value of R 10,03M in the caustic circuit. Also, based on approximately 3 tons of feed to the hydrometallurgical circuit it was found that the sulphuric acid crack required almost …
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New Solid Polymer Electrolytes for Lithium, Sodium, and Calcium-based Batteries
… under blue light in the presence of calcium salt to form a stable network with high thermal stability and promising conductivity. Ionic conductivity of 3.4×10-4 S cm-1 at 110 °C and 3.0x10-6 S cm-1 at room temperature was achieved, similar to early-stage lithium SPEs. The electrolytes …
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The role of topoisomerase II in amsacrine resistance
… mouse mastocytoma cell cytoplasmic extracts by salt precipitation, DEAE-cellulose chromatography and SDS-PAGE resulted in a 3571-fold purification of the PDC enhancing activity. The PDC enhancing activity was shown to reside in a 70 kDa protein kinase with specificity for a casein kinase II …
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The Mechanism and Timescales of Soil Formation in the Hyper-arid Atacama Desert, Chile
… evaluated. Results suggested that the deposited salts are mainly sourced from marine aerosol, as well as fog, local entrainment of surface material and secondary reactions. A comparison of the deposition data with the geochemistry of a paleosol in the hyper-arid core of the Atacama showed that …
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Long-term response of soils subjected to repetitive geoenvironmental loads
… as the number of wet-dry cycles increases. Precipitation within dual-porosity microfluidic chips provides new insight into salt crystallization phenomena in geomaterials, such as fractured rocks. Deformable PDMS captures the effect of the crystallization force. Pore network topology and …
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Refinement of a Fertiliser-producing Urinal
… as commonly used as they could be because urine salt precipitation can cause pipe clogging leading to maintenance problems. This research aimed to improve on one promising technology: a novel, waterless fertiliser-producing urinal that collects and treats nutrients on-site for subsequent recovery …