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Showing 1 to 20 of 33 for “"formation kinetics"”.
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Formation kinetics of reaction bonded silicon carbide based materials
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1991.
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Iodine-Monofluoride (If) Emission Spectrum and Formation Kinetics in Electron Beam Produced Plasmas
Electron beam excitation of argon/CF(,3)I/NF(,3) gas mixtures produces intense blue-green fluorescence attributed to the heteronuclear interhalogen iodine-monofluoride (IF). Analysis of the observed IF emission spectrum has shown that it is most likely due to E (--->) A('3)(PI)(,1) transitions of …
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Processing - structure - property interrelationships of ferroelectric thin films with emphasis on formation kinetics
… manufacturing process. In this work, formation kinetics of PZT films were studied and the nucleation was found to be the rate-limiting step in the formation of the perovskite phase. Based on this finding, a seeding process was invented to encourage the nucleation of the perovskite …
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Dielectrics on Gallium Arsenide Using Silicon as a Sacrificial Layer: Formation Kinetics and Interface State Densities
Interface properties were studied and reaction kinetics characterized in a dielectric/Si/GaAs structure formed by direct nitridation or UV ozone oxidation of a sacrificial pseudomorphic epitaxial Si layer on a GaAs (100) substrate. The nitridation and oxidation process kinetics were studied by …
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Effects of metal ion–ligand interactions on the synthesis of metal nanostructures with controlled morphology
… nor are the effects of these interactions on the formation of metal nanocrystals. It is crucial to improve our understanding of the formation mechanisms of metal nanocrystals in order to produce nanocrystals with controlled morphology. This dissertation focuses on the metal ion–ligand interactions …
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Ion assisted deposition of multicomponent thin films
… stress measurement technique to study the formation kinetics of multi component oxide thin films was developed and was applied to PbTiO₃. Single phase PbTi 0₃ thin films were formed from the reaction between films in the deposited PbO ITi0₂ multilayer. The film stoichiometry was accurately …
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Formation rates of silver metal danoprisms as a function of halide concentration
… is the addition of defects during nanocrystal formation. Nanoprisms are highly responsive to this form of control through halide concentration. However, the rate at which this control occurs has remained relatively unexplored. The formation kinetics of silver nanoprisms were monitored before, …
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Discharge Pumped Iodine Monofluoride Laser: Operating Parameters and Collisional Kinetics
… to be 17.2 (+OR-) 4.0 ns. Finally studies of the formation kinetics of the upper laser level of IF have shown I*(('4)P) atoms to be an immediate precursor, while the F*(('4)P) atoms are unimportant.
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The effects of evaporation rate, solvent, and substrate on the surface segregation of block copolymers
… can be explained by considering the rate of film formation (kinetics), polymer - solvent interactions, and polymer - substrate interactions. However, in both systems the lower surface energy copolymer block (siloxane block, or diene block) preferentially segregated to the surface for all of the …
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Laboratory measurements and modeling of trace atmospheric species
… was coupled with the ICLA Spectrometer, and the formation kinetics of nitrosyl hydride, HNO, were measured as a means to test the system. Secondly, a novel edge-tuner was introduced as a means to expand the spectral range of the ICLA Spectrometer. An experiment for the detection of the …
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Thermodynamic and kinetic examinations of inorganic materials formation
Inorganic materials formation is the result of a complicated interplay between thermodynamics and kinetics. Improved understanding of such factors can aid the synthesis of target materials and the discovery of new materials. Here, techniques for carrying out time-resolved studies were developed and …
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Hybride Modellbildung zur Prozessführung von Fed-Batch-Kultivierungen mit Aspergillus niger
… proteins. In this work, the growth and product formation of A.niger in fed-batch cultivations is modelled by using the enzyme glucoamylase as an example product. Since classical modeling of bioprocesses involves a great deal of effort, a hybrid modeling approach is being pursued that combines …
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Physical Aging of Miscible Polymer Blends
… segmental cooperativity which dictates glass formation kinetics, and density (prior to aging). The variation of volume relaxation rate with aging temperature and composition was interpreted based upon these characteristics for the two systems. In addition, a general relationship was uncovered …
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Coupling of Chemical Kinetics with Computational Fluid Dynamics in a Three-Dimensional Engine Model
… steps to simulate the combustion and pollutant formation inside the internal combustion engine. With the current interest in advanced combustion modes and injection strategies, this approach depends on arbitrary adjustment of model parameters that could reduce credibility of the predictions. The …
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Investigating dysregulation in protein quality control mechanisms in senescent cells
… cells displayed extremely delayed aggresome formation kinetics in contrast with proliferative cells. Aggresome formation dynamics were also altered by perturbations to the autophagy network. We further developed a live-cell fluorescent reporter of proteostasis using the pathogenically …
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On the Kinetics of Protein Misfolding and Aggregation
… of the quest for potential inhibitors of amyloid formation. In addition, it is shown that Thioflavin T, to-date the most frequently employed fluorescent label molecule for bulk solution kinetic studies, can in the presence of potential amyloid inhibitor candidates be highly unreliable as a means …
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Chloramine and MIEX control of disinfection by-products formed from an alluvial aquifer water source
… for centuries for disinfection process. The formation of disinfection by-products (DBPs) caused by disinfection become a main safety issue for the public health. Trihalomethanes (THMs) and haloacetic acids (HAAs) are two of the major classes in DBPs. In response to this potential health risk …
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CU-CATALYZED CHEMICAL VAPOUR DEPOSITION OF GRAPHENE: SYNTHESIS, CHARACTERIZATION AND GROWTH KINETICS
… the temperature-dependence of the graphene formation kinetics leading to a discovery of the internal correlations of the associated energy barriers. The complicated effects of temperature on the nucleation density are explored. The criteria for identifying the rate-limiting step is proposed. …
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Use of a Purple Non-Sulphur Bacterium, Rhodopseudomonas palustris, as a Biocatalyst for Hydrogen Production from Glycerol
… scale-up systems, understanding its product formation kinetics is the key. It was found that the hydrogen production rate is not growth-associated and depends solely on the dry cell mass with a non-growth associated coefficient of 2.52 (Leudeking–Piret model dP/dt=2.52 X). Light is vital for …
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Sources of thermally generated vacancies in single-crystal and polycrystalline gold
… is used and extended to study generation (formation) kinetics in polycrystalline specimens whose dislocation density, subgrain size and grain size are measured. Analyses are performed, based on the present experimental data, to account for possible dislocation shortcircuiting and …
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