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 33 for “"electron number"”.
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Characterization of Electron Number Density of Rocket Exhaust Plumes Through Microwave Transmissions
… enhance the induced transient currents in flight electronics, and increase the risk of vehicle failure. The affinity of lightning to the plume can be associated with the plume's electrical properties, which are coupled to plasma characteristics including the electron number density. However, the …
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Non-Local Thermodynamic Equilibrium in Laser-Sustained Plasmas
… and ion line emissions used to spatially resolve electronic energy level population densities in each plasma species. A hydrogen seed in added to the argon flow for the purpose of determining electron number density by Stark broadening analysis of the Balmer series alpha line. Neutral and ionic …
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Implementation of Microwave Transmissions for Rocket Exhaust Plume Diagnostics
… a trail of exhaust that contains ions, free electrons, and soot. The exhaust plume increases the effective conductor length of the rocket. A conductor in the presence of an electric field (e.g. near the electric charge stored within a cloud) can channel an electric discharge. The electrical …
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DEVELOPMENT OF A LOW PRESSURE-INDUCTIVELY COUPLED PLASMA-ION SOURCE FOR MASS SPECTROMETRY
… mass spectra similar to those obtained by an electron impact source were observed. However, on the addition of more isobutane only the molecular ions (M*) for chlorobenzene, iodobenzene and dibromobenzene were observed. The detection limits for the instrument operating in the molecular mode …
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ORGANOMETALLIC CHEMISTRY FROM THE INTERACTING QUANTUM ATOM APPROACH
… giving the so-called IQA-EDF-DAFH analysis (EDF= electron-number distribution function) which provide a complete description of the chemical bond in terms of electron density. In order to make benchmark of this new technique classic metal-organic molecules like metal carbonyls, metal hydrides and …
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Improved observational programs for the Arecibo ionospheric observatory
… One will cover the 200-2000 km range and measure electron number densities, temperatures and composition with a time resolution of 25 min. at low altitudes and 1 and one-fourth hrs. at high altitudes. The other program will measure number densities, temperatures, and photo-electron fluxes in the …
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Various Manifestation of Non -Abelian Statistics in Condensed Matter Systems
… and this requires a change of parity of the electron number in sonic of the ground states.
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Correcting the Self-Interaction Error of Approximate Density Functionals
… properties. PZ-SIC seems to overcorrect many-electron systems. We devised a modified version of the SIC, which is scaled down in many-electron regions. The scaled-down SIC has greatly improved performance for many molecular properties. Studies of fractionally-charged systems led to the new …
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Design and Characterization of a Coaxial Plasma Railgun for Jet Collision Experiments
… and photodiode. Peak line-integrated electron number densities of approximately 8 × 10<sup>15</sup> cm<sup>-2</sup> and jet velocities of tens of km/s are inferred from the data recorded from ten experimental pulses.
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Alloying effects on high-temperature deformation behavior of nickel aluminide intermetallics
… on the periodic table, which will provide the electron number effect (Mo vs. Nb) and the atomic size effect (Cr vs. MO).;The specimens were tested at constant strain rates ranging from 10 -6 to 10-3 s-1. At high temperatures, the flow stress becomes dependent on strain rate. The materials were …
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Artificial heating of the lower ionosphere
… has approximately doubled the ambient electron temperature at an altitude of 80 km. Energy from the radio wave is deposited in the ionosphere as a result of collisions of the electrons with the neutral molecules. Cross-modulation experiments (performed elsewhere) have gained information …
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Earth's outer electron radiation belt : sources, losses and predictions
The outer electron radiation belt is highly dynamic in space and time. Understanding the mechanisms that drive these variations is of high interest to the scientific community because of the negative effects that the radiation belt can have on satellite instrumentation. Evidence in support of a …
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Spin dependent reactions in an electronically excited helium discharge
The electron spin dependence of reactions involving helium metastable atoms is investigated using optical pumping and microwave diagnostic techniques. Wigner (1927) proposed that electron spin angular momentum is conserved in atomic collisions. This rule of elec-tron spin conservation is tested in …
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Aspects of the microwave induced plasma as an element selective detector for supercritical fluid chromatography and supercritical fluid extraction
… temperature, rotational temperature, and electron number density measurements to determine the effect of CO₂ on the excitation characteristics of a He MIP is also described. However, application of kinetic theory and a recently developed theory on charge transfer allows a reasonable series …
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Ultrashort laser pulse-matter interaction: Fundamentals and early stage plasma dynamics
… the numerical simulation. It is found that the electron emission process greatly affects the surface electron temperature.^ The femtosecond laser ablation of silicon in air is also investigated by the integrated model. The numerical analysis results are validated and supplemented by the …
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Coexistence of Slow Magnetoacoustic Waves and Thermal Limit Cycles in a Coronal Bright Point
… are used to estimate the temperature and electron number density of the coronal plasma as a function of time, which exhibit oscillatory behaviour. We detect and analyse 792 oscillation events with periods ranging from 3 to 240 min. We observe spatial coherence across regions and find, with …
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Application of Ab-initio Quantum Chemistry Techniques to Hypersonic Flows for Plasma Blackout Alleviation
… are electrophilic compounds at reducing the number density of electrons within a hypersonic plasma sheath environment. This reduction in the electron number density reduces the critical plasma frequency, thus allowing for the successful propagation and transmission of electromagnetic signals. …
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Multi-Physics Model of a Dielectric Barrier Discharge Flow Control Actuator with Experimental Support
… results confirmed the model predictions of an electron temperature of 0.282eV and an electron number density of 65.5 × 10⁻¹²kmol/m³ matching to within a relative error of 12.4% and 14.8%, respectively. The shadowgraphic results also confirmed the model predicted velocities of flow structures of …
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Towards Systematic Improvement of Density Functional Approximations
… functional, as a function of the fractional electron number, should yield a series of line-segments across the integer points. In this dissertation, by imposing the PPLB condition in a local, size-consistent way, we develop the local scaling correction (LSC) and its updated version, the …
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Diagnostic techniques for EHD and MHD interaction
… interactions, a series of experiments and a wide number of diagnostic techniques have been utilized. The EHD interaction, realized by means of a Dielectric Barrier Discharge (DBD) actuator, and its impact on the boundary layer have been evaluated by means of two different experiments. In the first …
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