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.
Results
Showing 1 to 20 of 22 for “"Plasma chemistry"”.
-
Modeling of high-pressure rare gas lasers: Kinetics and plasma chemistry
A computer model has been developed to investigate the excitation and deexcitation mechanisms and to optimize the laser performance over the wide range of operating parameters. Three rare gas lasers have been computationally investigated: the Xe laser with Ar, He/Ar and Ne/Ar buffer gases, the Ne …
-
A kinetic transport model of uranium molecular species formation in a laser ablated plasma plume
… tackling only the former problem by developing a plasma-chemistry model of uranium molecular species formation during the early stages of nuclear fireball expansion. The model features a newly constructed U$_x$O$_y$ reaction mechanism that consists of 30 reaction channels for 11 uranium molecular …
-
Multi-scale modeling of nanosecond plasma assisted combustion
… a comprehensive understanding of nonequilibrium plasma effects (in situ generation of reactive species and radicals combined with gas heating) on the combustion process is still lacking. Over the past decade, research efforts have advanced our knowledge of electron impact kinetics and low …
-
CO2 Dissociation using the Versatile Atmospheric Dielectric Barrier Discharge Experiment (VADER)
… temperature, non-thermal, atmospheric pressure plasma which creates high energy electrons suitable for dissociating CO2 into its components (CO and O) as one step in the CCU process. Here I discuss the viability of using a DBD for CO2 dissociation on an industrial scale as well as the …
-
Unsupervised Feature Extraction Techniques for Plasma Semiconductor Etch Processes
… sizes on semiconductor chips continue to shrink plasma etching is becoming a more and more critical process in achieving low cost high-volume manufacturing. Due to the highly complex physics of plasma and chemical reactions between plasma species, control of plasma etch processes is one of the …
-
Etching of Silicon, Silicon Nitride, and Atomic Layer Etching of Silicon Dioxide using Inductively Coupled Plasma Beams
… importance of this process, studies of the basic plasma chemistry and plasma-surface interactions when using these gases are largely lacking. Furthermore, fabrication of devices with feature sizes below 10 nm requires manufacturing with atomic level precision, making Atomic Layer Etching (ALE) …
-
Establishment and Utilization of Tools for Enhancing Foodfish Health
… intervals for immunology, hematology and plasma chemistry analytes in striped catfish in a recirculating aquaculture system (RAS). In a third study, the immunomodulatory effects after directly feeding probiotic strains of Bacillus subtilis NZ86 and O14VRQ in Nile tilapia were ascertained. …
-
Transformation of biomass to value-added chemicals through non-thermal plasma
This study explored non-thermal plasma (NTP) conversions of lignocellulosic biomass for producing biobased chemicals. Non-thermal plasma is emerging as a promising green, low-energy technology for biomass conversion, benefited by its ability to produce chemically reactive environment at mild …
-
Characterization, optimization, and simulation in through silicon via (TSV) dry etch
… in this study. Parameter ramping and post-etch plasma treatment techniques have been performed on the bias voltage, pressure and gas flow rate to address profile defects produced by the Bosch process, such as profile bowing and sidewall scallops. A single-step etching method mixing SF6 and C4F8 …
-
Fluid modeling of solvated electrons and reactive species chemistry at DC plasma-water interfaces
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-11 without embargo terms
-
Modeling of Polar Cap Ionospheric Patches and Attendant Plasma Instabilities: Initialization from Data and Parametric Analysis
… history of theoretical work on ionospheric plasma patches and their attendant plasma fluid irregularities, particularly within the polar cap region. Within this region though, plasma theory does not always yield tractable problems with succinct analytic solutions that are conceptually …
-
Removal of tin from exterme ultraviolet collector optics by an in-situ hydrogen plasma
… of a 13.5 nm photon, EUV light must be made by a plasma, rather than by a laser. Specifically, the industrially-favored EUV source topology is to irradiate a droplet of molten Sn with a laser, creating a dense, hot laser-produced plasma (LPP) and ionizing the Sn to (on average) the +10 state. …
-
Study of contaminants in plasmas during decommissioning processes
… when contaminated components are subjected to plasma-based decommissioning processes are developed. Two parallel plasma systems are developed and investigated. A better-understood argon plasma based system has temperature measurement methods developed, along with an exploration of the resultant …
-
Microwave plasma synthesis of nano-sized silicon carbide at atmospheric pressure
… sol-gel processes, microwave heating and various plasma techniques. Among the different synthesis methods reported in the literature, very few experiments investigate the microwave-induced plasma synthesis of SiC nanoparticles. The few reported studies show promising results with regard to …
-
Analytical evaluation of microplasma technologies for production of hydrogen fuel from water
… despite technological limitations. Microplasma technologies utilize nonthermal and non-Maxwellian reaction conditions in nonconventional chemical reactions and could provide novel pathways to producing H2 fuel. The current work is the first demonstration of H2 production from H2O with …
-
Identification of changes in the surface of textiles subjected to plasma chemical treatment using attenuated total reflectance-fourier transform infrared spectroscopy
<p>Plasma chemical oxidation has been proposed as a “nondestructive” method for preparing samples from archaeological materials for radiocarbon dating using accelerator mass spectrometry. However, the chemical effects of low-temperature, low-pressure plasma discharges on fragile archaeological …
-
Multi-physics modeling of plasma discharge and material removal in micro electro-discharge machining process
… understand formation and expansion of micro-EDM plasma, and the process of formation of melt-pool and material removal at the workpiece. Initially, a model of micro-EDM plasma has been developed using a ’Global Model’ approach in which the plasma is assumed to be spatially uniform, and equations …
-
Nanoibridi costituiti da acido ialuronico e nanopaticelle metalliche per la cura delle ferite e la rigenerazione tessutale
… solo in Italia ma anche in tutto il mondo. Il plasma consente di sintetizzare o modificare in modo efficiente i nanomateriali utilizzando processi eco-compatibili e spesso in un unico step di sintesi, riducendo notevolmente gli investimenti ed i costi del lavoro. Di conseguenza, la sintesi …
-
Surface Chemical Functionalization based on Plasma Techniques
… a thorough understanding of the structure and chemistry of the solid-liquid interface when such a material has to work in the actual context. The research domain is complex due to the diversity of materials and applications of interest and the variety of biological species the biosensor device …
-
Characterization of PET samples processed in an RF oxygen discharge
<p>A radio frequency plasma (13.56 MHz) was used to modify the surface of a poly (ethylene terepthalate) (PET) sample. The plasma was generated in a pure oxygen process atmosphere at pressures of 100 mTorr, and 2.0 Torr at output powers of 250 Watts and 500 Watts.</p> <p>Optical emission …
Page 1 of 2