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 108 for “"work function"”.
-
Work Function Analysis of Vegetarian Entree Production
… production of eight vegetarian entrees. The two work areas observed were the ingredient assembly area and the cooks' production area. This labor time was recorded by Work Functions to find the dis- tribution of labor time. Data from the observations were compiled using an Apple II computer …
-
Measurement of work function in CF₄ gas
… determining particle energy in detectors, the work function, is disputed and not well known. This thesis measures the work function of CF4 gas for use in the Dark Matter Time Projection Chamber as well as all experiments that use CF4 as a drift gas. This was accomplished by bombarding CF4 in a …
-
Dependence of rare-gas adsorbate dipole moment on substrate work function
… On refractory metals, the deduction of the metal work functions is unexpectedly large, while on simple metals, the effect is nearly undetectably small. The ""switching"" theory proposed by Flynn and Chen explains the general trend of the substrate dependent work function change reasonably well and …
-
Synthesis and Assembly of Dihydroindolizines on Gold Surfaces for Light Induced Work Function Alterations
… (dihydroindolizine) is demonstrated to alter the work function of the underlying substrate (170 meV). This same molecule also provides spectroscopic signatures for correlating the change in molecular structure to the induced change in the surfaces' electronic properties. Polarization modulation …
-
Impact of Chemical States on the Effective Work Function of Metal Gate and High-kappa Dielectric Materials on Novel Heterostructures
… the effect of a heterojunction on the effective work function in a metal/high-? gate stack, the characteristics of aqueous hydrochloric acid cleaned (aq-HCl) GaN surface and the interface between GaN and Al2O3, HfO2 and GaON. The investigation of the effect of a heterojunction on the effective …
-
Work Function Study of Iridium Oxide and Molybdenum Using UPS and Simultaneous Fowler-Nordheim I-V Plots with Field Emission Energy Distributions
The characterization of work functions and field emission stability for molybdenum and iridium oxide coatings was examined. Single emission tips and flat samples of molybdenum and iridium oxide were prepared for characterization. The flat samples were characterized using X-ray Photoelectron …
-
The application of the Kelvin probe in materials science.
… ambient and UHV environments. The concept of the work function φ and its importance as a parameter in materials science is discussed in the context of novel technological applications. The various methods to determine the work function are reviewed. The main measurement technique used here “ the …
-
The Effect of Average Grain Size on Polycrystalline Diamond Films
The work function of hydrogen-terminated, polycrystalline diamond was studied using ultraviolet photoelectron spectroscopy. Polycrystalline diamond films were deposited onto molybdenum substrates by electrophoresis for grain sizes ranging from 0.3 to 108 microns. The work function and electron …
-
Study of semiconductor and metal surfaces using a novel scanning Kelvin probe.
… Probe is a capacitor device used to measure the work function phi between a vibrating reference electrode (the tip) and the surface under investigation. It utilises a non-contact, non-destructive measurement mode allowing work function measurements at temperatures in the range from (300 - 1100) …
-
Application of scanning micro-tip and UHV Kelvin probes in surface and material characterisation.
In this thesis we present work utilising the scanning Kelvin probe (SKP) for surface potential mapping and monitoring changes in work function due to environmental influences in ambient and UHV conditions. The SKP is a truly non-contact technique which determines local work function changes and …
-
Surface reactions of boron with clean tungsten substrates
"A model developed to predict adsorbate-induced work-function changes for thermionic emitters is shown here to apply to a more general class of electron emission phenomena and a much broader range of adsorbates. This model predicts that chemically, vapor-deposited boron will increase the work …
-
Thermionic emission from a recrystallized tungsten filament
… and 4.62V [100]. It was evident that the average work function has strong dependence on the low work function patches as predicted by theory. There is strong evidence that a polycrystalline and a single crystal filament have equivalent high and low work function patch distributions."
-
Controlled doping of organic semiconductors and 2d materials with molecular reductants and oxidants
… decrease in the sheet resistance and tunable work function shifts. A subset of these molecules is applied to MoS2 and WSe2 to realize controllable n- and p-doping, respectively, to improve their electrical properties. Other experimental techniques, especially UPS and XPS, are coupled with the …
-
Theoretical investigation of polar zinc oxide surface modification via phosphonic acid self-assembled monolayers
… acids has been studied using density functional theory. The calculations indicate that there is a substantial change in the binding energies and work function modification depending on the binding motif. The results also indicate that there is a pronounced difference in the magnitude …
-
Titanium dioxide (TiO2) as buffer layer in organic solar cell device
… sandwiched by indium tin oxide (ITO) (a high work function, transparent metal oxide) as the anode and low work function metal such as aluminum (Al) as cathode. The recent power conversion energy (PCE) has reached as high as 7.4%. But in spite of high PCE, this device suffers from degradation …
-
Ethanol and Fluorinated Ethanol Decomposition on Single Crystal Platinum Surfaces: Structure Sensitivity and Electronic Effects
To study the surface work function effect on the surface reaction mechanism, ethanol and fluorinated ethanol decomposition have also been studied on clean and oxygen precovered (2 x 1)Pt(110) surface. The reaction mechanism is very similar on clean (2 x 1)Pt(110) as on Pt(331), except the ethanol …
-
Hollow cathode life time modelling
… parts: a barium oxide<br/>depletion model, a low work function surface coverage model and a plasma update<br/>procedure to calculate the effects that a change in the insert surface work function will<br/>produce on the cathode plasma.<br/><br/>The barium-oxide depletion model has been validated by …
-
Labor Time Analysis of Vegetarian Entrees
… were to: (1) determine the total labor time by work function in the production of eight vegetarian entrees, (2) ascertain total labor cost in the production of the selected entrees to determine total cost of entree, and (3) compare labor time data from four of the entrees selected with data from …
-
Initial surface reactions and nucleation kinetics of boron on atomically clean molybdenum substrates
… of the substrate has been shown through work function measurements on the boron covered molybdenum field emitter surfaces. The boron-induced work function change of molybdenum has been shown to be in agreement with a theoretical model which predicts positive, as well as negative work …
-
Vibrating CPD Chemical Degradation Oil Sensor
… Vibrating Kelvin probe method for measuring the work function of metals has been used since 1932. Among the applications of this technique are adsorption, corrosion, friction and other studies. A novel application of this method is proposed in this thesis. The vibrating Kelvin system was created …
Page 1 of 6