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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 110 for “"supersaturated"”.
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Nucleation in Supersaturated Vapors
Made available in DSpace on 2015-05-12T17:02:28Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 0006927.PDF: 3852551 bytes, checksum: 5876e2d80b3e1ce3b5ed3b5d56830ab8 (MD5) Previous issue date: 1953
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Screening experiments using supersaturated designs with application to industry
… The primary focus of the thesis is on supersaturated designs that have more parameters to be investigated than runs available. Such designs are particularly useful when experiments are expensive to perform. In addition, the statistical issues behind a real-life screening experiment are …
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Low Energy Ion Bombardment Effects in Supersaturated Copper-Indium Alloys
… energy (200 - 3000 eV) Ar('+) ion bombardment of supersaturated Cu:In alloys. Ion bombardment always resulted in the preferential sputtering of In although for sample temperatures T(,s) (GREATERTHEQ) 250(DEGREES)C, In loss due to preferential sputtering was increasingly compensated by …
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LASSO-OPTIMAL SUPERSATURATED DESIGN AND ANALYSIS FOR FACTOR SCREENING IN SIMULATION EXPERIMENTS
Complex systems such as large-scale computer simulation models typically involve a large number of factors. When investigating such a system, screening experiments are often used to sift through these factors to identify a subgroup of factors that most significantly influence the interested …
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DEVELOPMENT OF SUPERSATURATED MATRIX SYSTEMS FOR POORLY WATER-SOLUBLE COMPOUNDS BASED ON SPRAY-DRIED SOLID DISPERSIONS
… rate while maintaining the stability of the supersaturated state during and after dissolution. Two types of polymeric carriers, namely hydroxypropyl methylcellulose acetate succinate (HPMCAS) and copovidone S-630, were used in spary-dried dispersion (SDD) formulations. Weak acid drugs …
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Investigating the Dissolution and Permeation Properties of Flufenamic Acid Cocrystals
… cocrystals. (2) Effect of polymers on cocrystals supersaturated solution: The influence of three polymers (polyethylene glycol (PEG), polyvinylpyrrolidone (PVP), and a copolymer of N-vinly-2-pyrrolidone (60%) and vinyl acetate (40%) (PVP-VA)) on FFA crystallization from FFA and FFA cocrystals …
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ΔΟΜΗ ΚΑΙ ΔΙΑΒΡΩΤΙΚΗ ΣΥΜΠΕΡΙΦΟΡΑ ΚΡΑΜΑΤΩΝ ΑΛΟΥΜΙΝΙΟΥ-ΧΑΛΚΟΥ-ΜΑΓΓΑΝΙΟΥ ΓΡΗΓΟΡΑ ΣΤΕΡΕΟΠΟΙΗΜΕΝΩΝ
… THE STABILITY OF THE AL-4.5 NT% CU-2.0 NT% MN SUPERSATURATED SOLID SOLUTIONS WAS INVESTIGATED BY ISOCHRONAL AND ISOTHERMAL STUDIES OF THE VARIATION OF THEIR LATTICE PARAMETER. THE SUPERSATURATED SOLID SOLUTION WAS STABLE UP TO 175 C AND THE ACTIVATION ENERGY FOR THE DECOMPOSITION OF THE …
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Dissolution Behavior of Amorphous Solid Dispersions
… from the dissolution of an ASD formulation is supersaturated. In other words, the solution concentration is higher than the crystalline solubility. These solutions are therefore thermodynamically unstable and can crystallize. Recent evidence suggests that some systems can undergo another phase …
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Light utilization and excretion of organic matter by antarctic lake phytoplankton
… The shallower waters of these lakes were supersaturated with oxygen, brighter and probably nutrient limited. Photosynthesis in <i>Chlamydomonas subcaudata</i> Wille was 2.5 to 3.5 x less at supersaturated oxygen in comparison to saturated oxygen. The higher amount of PER in the shallow …
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Sea surface distribution of nitrous oxide and methane in European shelf seas and the Atlantic Ocean
… ocean. Shelf sea surface waters were slightly supersaturated in N2O at 102 %, but undersaturated in the open ocean at 97 %, acting as slight atmospheric sink. The cause of undersaturation in surface waters is unclear, but may be attributed to seasonal cooling and a potential microbial N2O …
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ΕΠΙΔΡΑΣΗ ΤΗΣ ΠΑΡΟΥΣΙΑΣ ΤΟΥ ΧΑΛΚΟΥ ΣΤΟΝ ΠΕΡΛΙΤΙΚΟ ΚΑΙ ΜΠΑΙΝΙΤΙΚΟ ΜΕΤΑΣΧΗΜΑΤΙΣΜΟ ΤΩΝ ΧΑΛΥΒΩΝ
… E-CU PRECIPITATES FORMED DUE TO AGEING OF THE SUPERSATURATED FERRITE. DURING ISOTHERMAL BAINITIC TRANSFORMATION THERE IS ABSENCE OF ANY COPPER PRECIPITATION BOTH WITHIN BAINITIC FERRITE AND WITHIN BAINITIC CEMENTITE. COPPER IS PRESENT IN A SUPERSATURATED CONDITION WITHIN BAINITIC FERRITE BUT …
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Designing Microstructure through Reverse Peritectoid Phase Transformation in Ni₃Mo Alloy
… the intermetallic γ-Ni₃Mo was formed from the supersaturated solution at temperatures ranging between 600°C and 900°C for up to 100h. The 100% stable γ-Ni₃Mo phase was formed at 600°C after 100h, while aging at temperatures ranging between 650°C and 850°C for 25h was not sufficient to complete …
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The Influence of PVAP on the Stability of Amorphous Solid Dispersions of Itraconazole Produced using Hot Melt Extrusion Technology
… investigate its use as a stabilizing polymer for supersaturated solutions of itraconazole (ITZ) in neutral pH aqueous media and in the solid-state during storage over time. Polyvinyl pyrrolidone vinyl acetate (PVPVA) was incorporated into PVAP as a carrier matrix with the aim of lowering the melt …
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Two-Part Reactive Formulations for Intranasal Delivery of Benzodiazepines
… at the time of administration, a metastable supersaturated solution of the benzodiazepine is produced. The supersaturated state of the benzodiazepine provides a large chemical activity gradient for rapid absorption across the nasal mucosa and into systemic circulation. In vitro …
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Superconductivity of a Precipitation Hardening Alloy of Aluminum
… involves the precipitation of Mg2Si from a supersaturated solid solution. The purpose of this study was to determine the effect of the lattice distortions produced by the precipitating particles on the superconducting behavior of the aluminum.
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Primary and secondary crystal nucleation of pharmaceutics
… depending on the conditions of the used supersaturated solution. Primary nucleation occurs in a clear supersaturated solution, while secondary nucleation is induced by at least one parent crystal present in the solution. Despite the large amount of research conducted on this field, …
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Selective recovery of salts from a ternary eutectic system in EFC using seeding
… thereby achieve selective recovery from multi-supersaturated systems. The aim of this study was therefore to determine the effect of seeding on the yield and purity of the salt product in a system supersaturated with two salts and ice. A eutectic MgSO4-Na2SO4-H2O system was chosen for this …
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Impact of Polymers on the Solution Crystal Growth Rate of a Poorly Water-Soluble Active Pharmaceutical Ingredient
… on the ability to inhibit crystallization of the supersaturated drug solutions. Polymers can be used to inhibit crystallization and prolong supersaturation, however the mechanisms of polymer inhibition are not yet fully understood. Therefore it is desirable to understand the attributes that render …
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Molecular origins of tissue vulnerability to aberrant aggregation in protein misfolding diseases
… at high risk of aggregation (formed by supersaturated proteins), and the vulnerability to neurodegenerative diseases. We thus identify an AD-specific supersaturated set of proteins - termed the metastable subproteome, whose expression in normal brains recapitulates the staging of AD, …
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Retrograde melting in transition metal-silicon systems : thermodynamic modeling, experimental verification, and potential application
… is used to demonstrate that in silicon under supersaturated conditions, such solutes precipitate out into liquid droplets. Synchrotron-based Xray Absorption Microspectroscopy measurements provide experimental confirmation of such phase transitions and the underlying thermodynamics. Finally, …
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