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 23 for “"Critical pressure"”.
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Experimental and Prediction Approaches to Determine Dissociation Constants (pKa) of Amines
… into two categories: (a) molecular weight, critical pressure and critical pressure as inputs that were used to identify the compound; (b) temperature and physical properties as inputs including density, viscosity, surface tension and refractive index that were used to correlate pKa values. …
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Análise estrutural de painéis curvados reforçados sob carregamento de pressão externa uniforme
… reinforced curved panels under uniform external pressure loading is investigated in this study through experimental tests and numerical simulations based on the finite element method. The experimental tests carried out in this investigation cover tensile testings, imperfection measurement and …
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Influencing contact-line behavior in dynamic wetting through thermocapillarity and surface topography
… on substrates with topographical defects due to pressure-driven flow of a surrounding fluid. Above a critical pressure gradient, the shear force acting on the droplet exceeds the retention force due to surface tension, causing the contact line to depin from the defects which leads to the droplet …
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Transonic aerodynamics of dense gases
… gas behavior near the saturated vapor curve and critical pressure region where the fundamental derivative, Γ, is negative. This negative Γ region is of interest because the nonclassical gas behavior such as formation and propagation of expansion shocks, and the disintegration of inadmissible …
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Mystical anxiety: American philosophy between Emerson and pragmatism
… Emerson-to-pragmatism story by showing how the critical pressure Melville and Dickinson applied to the Emersonian idea of an all-encompassing life to which human beings must conform marks a transition in American intellectual history from the mystical passivity of Emerson to the intelligent …
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Study of heat transfer in a 7-element bundle cooled with the upward flow of supercritical Freon-12
Experimental data on SuperCritical-Water (SCW) cooled bundles are very limited. Major problems with performing such experiments are: 1) small number of operating SCW experimental setups and 2) difficulties in testing and experimental costs at very high pressures, temperatures and heat fluxes. …
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Cavitation in Vial Drop Subjected to Mechanical Shock
… is a phenomenon that occurs when the local pressure falls down below the critical pressure. Previous work from the Randolph lab demonstrated that protein aggregates can form when a vial of therapeutic solution is dropped onto a hard surface. The process by which this occurs is most likely …
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Development of an Injectable Ablative Therapy for Resource-Limited Settings: Applications in Tumor Ablation
… to adjacent organs. With the recognition of pressure-induced crack formation as a source of leakage, reducing the infusion rate and volume will improve localization. Further, the incorporation of ethyl cellulose is likely to reduce leakage because it forms a gel upon exposure to the aqueous …
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Modelling and Simulation of Carbon Dioxide Transportation in Pipelines: Effects of Impurities
… concentration, nitrogen had the worst effect on pressure loss (32.1 %) in horizontal pipeline, density, and critical pressure. Carbon monoxide (with only 0.2-mol %) had the smallest effect in pressure drop (0.3 %). Analysis of supercritical and subcritical (or liquid) CO2 fluid transportation …
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High-pressure NMR studies of model membranes and Kramers turnover on solution
The pressure and anesthetic effects on lineshapes and various relaxation times of phospholipid model membranes DPPC in multilamellar dispersions and in unilamellar vesicles have been investigated by using $\sp{31}$P NMR, $\sp2$H NMR, as well as one and two dimensional $\sp1$H NMR techniques in both …
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COMPOSITION AND PRESSURE DEPENDENT STUDY ON WEYL SEMIMETAL Mo1-xWxTe2
In this work, the doping and pressure effects on the Weyl semimetal Mo1−xWxTe2 have been investigated. A series of single crystals of Mo1−xWxTe2 for x = 0, 0.10, 0.30, 0.40, 0.50, 0.70, 0.75, 0.90, and 1 were synthesized using the self-flux method (for parent compounds MoTe2 and WTe2) and the …
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A Sequential Modeling Approach to Explain Complex Processes and Systems
The ability to predict accurately the critical quality characteristics of aircraft engines is essential for modeling the degradation of engine performance over time. The acceptable margins for error grow smaller with each new generation of engines. This paper focuses on turbine gas temperature …
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Thermodynamic calculations with TK!Solver
… The volumetric properties include temperature, pressure, volume, and compressibility factor. Program RESIDUAL.TK calculates residual and total properties of compounds as a function of temperature and pressure using the Pitzer correlation, van der Waals, or Redlich-Kwong equation of state. The …
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Vapor-Liquid Phase Equilibria Using Monte Carlo Wang-Landau Simulations
<p>The experimental determination of the critical point of metals is inherently connected with difficulties of measuring large temperatures and pressures. On the other hand, that of straight alkane chains larger than ten carbon atoms and branched chains larger than eight atoms is burdensome due to …
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Supercritical extraction of coal
Supercritical extraction of coal is removal of a select fraction of the coal by a solvent which is slightly above its critical temperature and above its critical pressure. The objective of this dissertation was to understand the mechanism of supercritical extraction, to test some promising …
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Ultrafast Response of Photoexcited Carriers in Transition Metal Oxides under High Pressure
… spectroscopy are used for the investigation of pressure-induced insulator-to-metal transitions in transition metal oxide compounds. The materials under study are α-Fe₂O₃, also known as hematite, and VO₂. Both materials undergo pressure-induced metallization. However, the physical mechanisms of …
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Characterization of tight and shale unconventional gas reservoirs using low field NMR
… sand cores, activated carbon, and sandpacks at pressures up to 7 MPa. In this thesis, for 150 cores, permeability was estimated using all existing NMR permeability correlations. In addition, irreducible saturations were presented for these cores. A new method to obtain residual saturation using …
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Application of fluid inclusions in geological thermometry
… inclusions provide valuable information on the pressure, temperature and fluid composition (PTX) of the environment of formation, hence understanding PTX properties of the fluid inclusions is required. The most important step of a fluid inclusion study is the identification of Fluid Inclusion …
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Mathematical models of combustion at high pressure
… that are valid at elevated, or extreme, pressures. Of particular interest is the regime of burning in which the pressure exceeds the critical pressure of the species undergoing chemical reaction. Fluids and flames are known to behave differently under these extreme conditions as opposed …
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Cavitation in Pharmaceutical Manufacturing and Shipping
<p>Therapeutic proteins are used to successfully treat hemophilia, Crohn's Disease, diabetes, and cancer. Recent product recalls have occurred because of sub-visible particle formation resulting from the inherent instability of proteins. It has been suggested that particle formation is associated …
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