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 72 for “"solid phases"”.
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Computational investigation on polycyclic aromatic hydrocarbons in the molecular and solid phases
In this Thesis we discuss the effects of specific chemical functional- ization and partial/complete atomic substitution on the electronic (ground-/excited-state) and charge-transport properties of small or- ganic compounds of interest for molecular electronics. In particular, we considered several …
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Structure and Dynamics of Thermotropic Liquid Crystalline and Solid Phases of Sodium Alkanoates (Nmr)
… ('23)Na spectra in the superwaxy and subneat phases indicate a distribution of sodium sites.
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The Thermodynamics of Contrained Systems and the Stability of Solid Phases in the Presence of Excess point Defects
Made available in DSpace on 2017-07-06T18:48:32Z (GMT). No. of bitstreams: 3 Holloway_James_P_MS.pdf: 79526238 bytes, checksum: 0e68eb4552ccd78d39de6b2df129d60a (MD5) Holloway_James_P_MS_ABS.pdf: 576867 bytes, checksum: 3e94108127ee4aff3a68070ebc3fa888 (MD5) license.txt: 4813 bytes, checksum: …
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An X-ray investigation of some low-temperature solid phases of the systems Cu2S-Sb2S3, Cu2S-As2S3, Cu2S-FeS, and Cu2S-CuS
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Geology, 1953.
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Surface Freezing in Surfactant/Alkane/Water Systems
… (Cm where m = 12 – 20, 28). Two distinct solid phases are observed depending upon the chain length difference between surfactant and n-alkane. Type I solid phases consist of a surface frozen mixed monolayer and are formed when this difference is small. Type II solid phases are bilayer …
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Supramolecular modification of selected antitubercular drugs
The author's objective was to prepare new solid phases of the antitubercular drug isoxyl [specifically polymorphs, solvates, cyclodextrin (CD) inclusion complexes and cocrystals] and to isolate and characterise a range of solvated forms of the rifamycin antibioticsrifampicin and rifaximin.
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The interaction forces in fluid-solid two-phase flows
The interaction force between fluid and solid phases is studied for both steady and unsteady flow situations. As a model, solid particles are assumed to be spherical and are distributed in regular arrays. For steady flows, a numerical method is used to calculate the interaction force for Reynolds …
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Influence of ultrasonic cavitation treatment on fragmentation and de-agglomeration of primary intermetallics and oxides formed in Al alloys
… and/or for accelerating diffusion in solid and liquid phases, has always mesmerised the scientific community with the remarkable effects that it produces during its application in fields ranging from automotive, aerospace, military, construction to even medical (therapeutics) and food …
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Transferência de calor em sistemas bifásicos durante a fusão térmica
… represent the temperature profile in liquid and solid phases during thermal fusion. The experimental results which were obtained in a special probe are compared with the results of the conductive unidirectional model in arder to determine the dynamical behavoir of the fusion front. The efficiency …
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MATHEMATICAL MODELING OF LIAL/FES¬2 HIGH TEMPERATURE BATTERY SYSTEM
… in the electrolyte, charge balances in the solid phases and electrolyte, complex multi-step electrochemical and chemical reactions in the electrodes are described in this model. The model includes the effects of precipitation salt on active area in the electrode and the discharge capacity. …
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Effect of organic matter and contact time on the sorption and bioavailability of chlorophenols
… with PCP and 4-MCP in both the liquid and solid phases. Sorption of both compounds was rapid, with 60-80% occurring within one day, but the process appeared to continue at a slower rate over several months. Statistical analysis showed that there were no differences in sorption due to SOM …
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Effect Of Source Water Blending On Copper Release In Pipe Distribution System: Thermodynamic And Empirical Models
… corrosion surface characterization in which the solid corrosion products formed in certain period of exposure to drinking water were tried to be identified with kinds of surface techniques. Surface characterization indicated that major corrosion products consists of cuprite (Cu2O) as major …
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X-ray emission spectroscopic study of chloride solid compounds using synchrotron radiation
… from molecules and materials in gas, liquid and solid phases with energy, angle and polarization dependence. A two-dimensional position-sensitive detector system with data acquisition software is developed for the spectrometer that allows collecting a complete x-ray emission spectrum …
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Modelling and simulation of fluidized-bed boilers and gasifiers for carbonaceous solids.
… composition throughout the freeboard height. (c) Solid compositions of the coal (or any other carbonaceous material), limestone and inert in the bed and throughout the freeboard. The considered components are: C, H, 0, N, S, ash, volatiles, moisture in the coal, CaCO3, CaO, CaSO4 , moisture in the …
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Algoritmo para cálculo de equilíbrio de fases com precipitação de parafinas
… saturation curves for systems with several solid phases and high CO2 content. Aiming a better oil description, especially for large chain compounds, it has been implemented a characterization routine, used to calculate necessary physical properties to the equation of state and the multisolid …
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Investigation of Multiphase Reactor Hydrodynamics Using Magnetic Resonance Imaging
… are considered: a co-current upflow gas-liquid-solid bed, a co-current downward trickle bed (gas, liquid, solid), and a gas-solid fluidised bed. These reactors were selected as they commonly demonstrate local hydrodynamic anisotropy which affects the global performance of industrial units. MRI …
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A Thesis on the Interactions between Lead Pipe Scales and Dissolved Silica from the Addition of Sodium Silicate as a Corrosion Inhibitor
… which is one of the dominant lead-containing solids found in such scales. The study used batch experiments with these solid phases at environmentally relevant water chemistry conditions. Statistic models were built for different conditions to fit experimental data, a biphasic model was found …
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Motion in the solid state studied by NMR and extended time scale MD simulation
… ability to characterise dynamic processes in the solid state is crucial to our understanding of many important materials. Nuclear magnetic resonance (NMR) and molecular dynamics (MD) simulations are two, highly complementary techniques that can be used in this pursuit, with NMR providing robust …
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Nuclear Magnetic Resonance Studies of Model and Biological Membranes
… Carbon-13 MASS NMR spectra, of fluid and solid phases, are well resolved. In some cases, resonances are observed in MASS NMR spectra which are not observed in sonicated systems. A combination of CP-MASS with deuterated and undeuterated lipids allows the observation of the effects of …
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Supramolecular derivatives of selected bioactive compounds : a physicochemical study
The author’s objective was to prepare new solid phases of three bioactive compounds: the steroidal anticancer agent 2-methoxyestradiol [polymorphs and cyclodextrin (CD) inclusion complexes], its derivative 2-methoxyestradiol-bis-sulfamate (polymorphs), and the antiretroviral agent, nevirapine …
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