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 20 of 169 for “"Supersaturation"”.
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Isolation of ambient aerosols of known critical supersaturation: the differential critical supersaturation separator (DSCS)
… only those particles that have critical supersaturations, Sc, within a narrow, user-specified, range. This Differential Critical Supersaturation Separator (DScS) is designed to supply one or more particle size and/or composition analyzers to permit the direct examination of the factors …
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Extremal graph theory: supersaturation and enumeration
In this thesis, we study supersaturation and enumeration problems in extremal combinatorics. In Chapter 2, with Balogh, we disprove a conjecture of Erdos and Tuza concerning the number of different ways one can create a copy of K_4, a complete graph on 4 vertices, in a K_4-free graph. In Chapter 3, …
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Faster Even-Cycle Listing via Unbalanced Supersaturation
Η παρούσα διπλωματική εργασία μελετά το θεμελιώδες πρόβλημα της απαρίθμησης κύκλων άρτιου μήκους υπό το πρίσμα της ακραίας θεωρίας γραφημάτων. Κεντρική ιδέα είναι ότι η δομική πληροφορία για τον αριθμό των κύκλων άρτιου μήκους σε διμερή γραφήματα μπορεί να μετατραπεί σε φράγματα για τον χρόνο …
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The co-crystallisation of sugars by the supersaturation process
Co-crystallising sugars by the supersaturation process was investigated using sucrose and lactose as the matrix sugars. The components to be cocrystallised with either sucrose or lactose were a variety of mono- and disaccharides along with sweeteners such as saccharin.Analysis of the materials …
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Effects of Dissolved Gas Supersaturation and Bubble Formation on Water Treatment Plant Performance
… pressure, a condition termed dissolved gas "supersaturation." This project investigated how bubble formation affects conventional drinking water treatment and examined factors that can reduce these problems. Gas bubbles attached to coagulated floc particles can reduce settling efficiency and …
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Understanding the impacts of supersaturation and seed crystal loading on struvite precipitation kinetics and collection efficiency
… was explored. The effects of initial supersaturation and seed loading concentrations on phosphorus removal kinetics and struvite solids distribution were studied using batch experiments. The kinetics of struvite precipitation with high seed loadings was also investigated and compared …
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Supersaturation effects on the change of phase in the equilibrium solid [to & from] solid + gas / Donald E. Pickles.
Thesis: B.S., Massachusetts Institute of Technology, Department of Chemical Engineering, 1953
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Investigation of Amorphous Solid Dispersions of Poorly Water-soluble Drugs in Poly (2-hydroxyethyl Methacrylate) Hydrogels for Enhanced Solubility and Controlled Release
… crosslinked PHEMA can maintain a high level of supersaturation over a prolonged duration via a diffusion-controlled feedback mechanism, thus avoiding the initial surge of supersaturation followed by a sharp decline in drug concentration, which is typically encountered with ASD based on …
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ΣΧΗΜΑΤΙΣΜΟΣ ΘΕΙΙΚΟΥ ΑΣΒΕΣΤΙΟΥ ΣΕ ΥΔΑΤΙΚΑ ΔΙΑΛΥΜΑΤΑ
… OF CALCIUM SULFATE FROM AQUEOUS SOLUTIONS AT SUPERSATURATIONS SUFFICIENT FOR SPONTANEOUS PRECIPITATION AND IN THE TEMPERATURE RANGE BETWEEN 20 -80 C. AT THESE CONDITIONS, THE ONLY PHASE FORMING WAS CALCIUM SULFATE DIHYDRATE. THE INDUCTION PERIODS AND THE SUBSEQUENT RATES OF PRECIPITATION WERE …
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Precipitation of nickel and cobalt sulphides using different reactor configurations
… the sulphide ion, is the creation of high local supersaturation. The supersaturation governs all precipitation and crystallisation processes in the way that it features in nucleation and growth rates. In crystallisation processes, the supersaturation can easily be controlled by thermal methods of …
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Water Treatment: Fundamentals and Practical Implications of Bubble Formation
… filter effluent. Coagulation processes can cause supersaturation and bubble formation by converting bicarbonate alkalinity to carbon dioxide by acidification. A model was developed to predict the extent of bubble formation during coagulation which proved accurate, using an apparatus designed to …
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Solid Dispersions in Medium-Insoluble Hydrogels for Enhancing the Solubility and Bioavailability of Poorly Soluble Drugs
… it is shown that one can obtain a more sustained supersaturation either through increasing the particle size of medium-insoluble hydrogels to reduce the rate of supersaturation generation or by lowering the total dose under non-sink dissolution conditions. The results of the second part …
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Calcium carbonate precipitation kinetics
… and functionally related to the state of initial supersaturation in the batch tests and the state of supersaturation in the steady state tests. Both steady state and batch tests gave the same dependence of the precipitation rate constant with supersaturation.
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Gypsum scale formation on a heated copper plate under natural convection conditions and produced water remediation technologies review
… in which surface temperature and the degree of supersaturation are varied, is set up and a scale inception time curve is plotted. No scale is observed at a supersaturation index smaller or equal to 1.4. Both higher temperatures and higher concentrations result in faster scale induction; however, …
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Nucleation Dynamics for Water Condensation on Hydrophobic Surfaces in the Presence of Non-Condensable Gases
… 10 μm. Based on the classical nucleation theory, supersaturation strongly influences nucleation dynamics. However, the presence of non-condensable gas can strongly reduce the nucleation density rate by forming a vapor-depleted gas diffusion layer. Therefore, this work studied the relationship …
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Crystallization Kinetics and Phase Behavior of Molecular Solutions
… are: (i) to study the effects of the rate of supersaturation on crystallization kinetics and polymorph selectivity; and (ii) to develop a generalized phase diagram from first principles and verify its applicability to a wide range of molecular solutions. This thesis investigates how the rate …
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Mechanistic study of nanoemulsion absorption and its application for permeation enhancement
… objective was to elucidate the role of transient supersaturation on permeation enhancement using nanoemulsion. In vitro permeation using self-nanoemulsifying drug delivery system (SNEDDS) was enhanced over the saturated solution due to the transient supersaturation; however the enhancement of …
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Towards understanding fouling mechanisms in continuous crystallisation processes
… construction (MOCs), process conditions (flow, supersaturation, temperature gradients (ΔT)) and crystallising solutions (solute and solvent). Primary fouling studies were conducted using a small scale batch crystallisation setup to explore the influence on MOCs, supersaturation and agitation …
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