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Showing 1 to 20 of 139 for “""Reactive Flux" Ratenkonstanten"”.
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Design and application of flux corrected transport for reactive solute transport modeling
Understanding reactive solute transport, which couples flow , transport, and chemical/ biological reaction in porous media, is important in areas such as aquifer remediation, groundwater contamination and geochemical reaction modeling. Due to the large time scales involved, lack of accessibility to …
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Reactive Trace Gases within and above a Grassland Canopy: Challenges for Flux and Transport Process Determination
… dioxide (NO2) and ozone (O3) constitute a reactive trace gas triad, which is highly important for the oxidizing capacity of the atmosphere, the functioning of ecosystems and climate change. Terrestrial ecosystems, such as grasslands, represent considerable sources and sinks for the …
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Reactive solids under shock compression
In this dissertation chemically reactive solids, such as thermites and energy absorbing molecular materials, under shock compression are explored. To drive shock waves into target materials, an apparatus to launch and monitor laser-driven flyer-plates was developed. This was coupled to a home built …
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Characterization of the growth flux during the deposition of hydrogenated amorphous silicon by DC magnetron reactive sputtering
Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T15:06:59Z Item is restricted indefinitely.
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Characterization of reactive and non reactive trace gas fluxes in and above soil
… ratio method) at a grass land site. The field NO fluxes were always around 1.8 ng m 2 s-1 while the laboratory derived NO fluxes were between 2.1 and 5,2 ng m-2 s-1. The agreement between the two data sets is considered to be quite good. The laboratory derived NO fluxes exceeded the field NO …
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Flow and reactive transport modeling at the stream-groundwater interface
… used as the top boundary condition of a reactive transport groundwater model of the subsurface beneath the streambed. Ambient groundwater that naturally interacts with the stream water is considered in scenarios of different magnitudes of downwelling stream water (losing case) and …
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Changes in microvascular hematocrit during post-occlusive reactive hyperemia: descriptions and mechanisms
… spectroscopy (NIRS), during post-occlusive reactive hyperemia (PORH). Mechanisms of reactive hyperemia within skeletal muscle were also explored. The investigation detailed in Chapter 2 of this dissertation found that the differing time courses of the kinetic responses of both oxy- and …
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Membrane-supported hydrogen/syngas production using reactive H₂O/CO₂ splitting for energy storage
… reaching 0.37 [mu]mol/cm²"s. Raising the oxygen flux suppresses carbon deposition and achieves optimum syngas composition for gas-to-liquid. CO₂ splitting was also demonstrated on the same membrane material, with similar enhancement as fuel is introduced and porous layers are added on both sides, …
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Control of Thin-Film Silicon Microstructure With Low-Energy Particle Bombardment in Reactive Sputtering
… at moderate growth temperatures. The growth flux with hydrogen includes energetic (∼100eV) neutral H, produced by the reflection of H2+ions from the target. We determine the kinetic role of these fast H neutrals in the nanocrystalline phase formation by substituting D for H during growth. …
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Transport Processes of Reactive Trace Gases in the Atmospheric Boundary Layer
… a series of measurement techniques for surface fluxes of reactive trace gases to determine their degree of agreement and to assess potential source of deviations. To study the impact of vertical transport mechanisms on surface trace gas measurements, this thesis presents a comprehensive set of …
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Growth and properties of hydrogenated amorphous silicon carbon alloys by DC reactive magnetron sputtering
… (a-Si$\rm\sb{1-x}C\sb{x}$:H) alloy films by dc reactive magnetron sputtering (RMS) of a silicon target in a plasma of (Ar + H$\rm\sb2$ + CH$\sb4).$ Films with optical bandgaps of 1.8-2.0 eV and x $\le$ 0.2 have a compact microstructure; no CH$\rm\sb{x}$ groups are detected by their stretching …
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SCIENTIFIC MACHINE LEARNING METHODS FOR REACTIVE-TRANSPORT AND THERMAL-TRANSPORT PROBLEMS
… dissertation presents novel SciML frameworks for reactive-transport and thermal-transport problems. The traditional numerical methods use initial and boundary conditions for tran- sient problems and cannot use the limited time history of solutions that might be available. The framework developed …
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Parallel Processing of Reactive Transport Models Using OpenMP
… is RT3D, a modular computer code for simulating reactive multi-species transport in 3-dimensional groundwater systems written and developed by Dr. T. Prabhakar Clement. RT3D is a sub-component of a parent code, MT3DMS, which utilizes RT3D to solve reaction terms. A speedup factor of 3.91 is seen …
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The Aquatic Geochemistry of the Particle-Reactive Radionuclides PO-210, PB-210, and BE-7
… in lower Chesapeake Bay. Atmospheric deposition fluxes for Be-7 in wet-only and bulk precipitation averaged 0.013 and 0.014 pCi/cm<sup>2</sup>/d, respectively, and for Pb-210 averaged 0.36 and 0.40 pCi/cm<sup>2</sup>/yr, respectively, suggesting that dry deposition makes only a minor contribution …
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DC magnetron reactive sputtering of low stress AlN piezoelectric thin films for MEMS application
… Thermalization of the impinging particle flux resulted in voided films with zone 1 microstructure with inferior film properties. Correlation between film crystallinity and oxygen content was explored with x-ray photoelectron spectrometry. Changes in film microstructure and composition are …
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Mitochondrial metabolic suppression and reactive oxygen species production during hypometabolism in mammals
… metabolic suppression affects mitochondrial reactive oxygen species (ROS) production, a topic which has been largely ignored previously. To accomplish these objectives, I measured in vitro respiration and ROS production rates of mitochondria from liver, skeletal muscle, and/or heart during …
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Growth of Wurtzite Gallium Nitride Epitaxial Films on Sapphire Substrate by Reactive Molecular Beam Epitaxy and Material Characterization
… specific ammonia flow rate (or V/III ratio if Ga flux is fixed) was required to obtain films with high electron Hall mobility. X-ray diffraction (XRD), photoluminescence (PL), cross-sectional transmission microscopy (XTEM) and deep level transient spectroscopy (DLTS) results also show consistency …
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Cleaning of tin debris by reactive ion etching in a discharge-produced EUV plasma source
… was investigated of cleaning Sn contamination by reactive ion etching (RIE) using chlorine plasma. The primary investigation revealed details of etch rate selectivity between Sn and Ru, the mirror surface material. The optimal condition, to remove Sn several hundred times faster than Ru with …
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Direct and indirect photoreactions of chromophoric dissolved organic matter : roles of reactive oxygen species and iron
… inorganic carbon may constitute a significant flux in the global carbon cycle. Photoreactions ultimately lead to the destruction of the chromophores and hence to the loss of absorption and fluorescence (bleaching), thus acting as a sink for CDOM. Photodecomposition may proceed both via direct …
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Passive detection of phosphorus in agricultural drainage waters using reactive hybrid anion exchange resins
… of concentrations and loads of dissolved reactive P (DRP) from a large number of agricultural waterways because of its simplicity and cost effectiveness. The passive detection technique involves the deployment of a reactive adsorbent in water for known periods, and the concentration of P …
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