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 47 for “"ion current"”.
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Ion current modulation in bio-mimetic channel systems
Ion channels form information processing in living cells by facilitating electrical signals across and along cellular membranes. Applying the same principles to man-made systems requires synthetic ion channels that can alter their conductance in response to various external manipulations. And the …
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Electric field mill for the simultaneous measurement of electric field strength and ion current diensity
… last 20 years, the use of high voltage direct current (HVDC) power transmission has grown considerably. With the increase in the number of HVDC transmission lines and in the transmission voltages, concern has increased as to possible health effects. For research on these health effects to be …
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Ion Current Rectification in Nano/Micro-Fluidic Interfaces and Pulsed Glow Discharge Time-of-Flight Mass Spectrometric Chemical Speciation
… disposability, portability, low sample consumption, fast analysis time, and parallel analysis potential for multiple samples in a single device. To improve microfluidic device functionality, integrated systems-nanofluidic/microfluidic interfaces (NMIs) have been fabricated for concentrating …
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Analysis of the ion current collection in the plasma wake during the Charging Hazards and Wake Studies (CHAWS) experiment
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1997.
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Analysis of the ion current collection in the plasma wake during the Charging Hazards and Wake Studies (CHAWS) experiment
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1995.
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Ionization in diesel combustion: Mechanism, new instrumentation and engine applications
… particulate smoke (Soot). To reduce these emissions, close loop engine control strategies are required. Therefore, there is a need for an in-cylinder combustion sensor. The ion current sensor has been used for combustion sensing in gasoline engines for which ionization mechanisms have been …
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Combustion, Ionization And Sporadic Pre-Ignition In A Turbocharged Gasoline Direct Injection Engine.
<p>This research is focused on the use of ionization of combustion products in hydrocarbons-air flames to gain a better understanding of the combustion process in turbocharged gasoline direct injection engines. A GM 2.0 L Ecotec GDI-T engine is used in this investigation. The ion current is …
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Ionization In Diesel Combustion For On-Board Diagnostics And Engine Control
… about engine-out NOx and particulate matter emissions. To meet the current emission standards, advanced diesel engines are fitted with electronically controlled fuel injection systems and sophisticated and expensive after-treatment devices. Further improvements are still needed to meet future …
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Particle-in-Cell Simulations Examining AK Gap Closure Mechanisms in the Pinch Reflex Diode
… diode are studied using cylindrical, two-dimensional, fully kinetic, electromagnetic, particle-in-cell simulations. The key physical dimensions in the model are based on the Mercury accelerator at the Naval Research Laboratory in Washington, DC. Simulation results agree well with theoretically …
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High current coaxial ion beam/laser beam spectrometer
The construction and operation of a new apparatus for making spectroscopic investigations of molecular ions is described. In the new ion beam machine, the ion beam and laser beam overlap in a coaxial geometry. The machine has much higher ion current than an apparatus previous used. The laser beam …
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Deposition of tantalum thin films by RF sputtering with substrate bias
The effects of energetic ion bombardment on the crystallographic structure of RF sputtered tantalum thin films on different substrates, particularly aluminum and silicon, have been studied. The effect of substrate biasing on ion current and film thickness has been investigated. The study included …
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Hollow Plume Mitigation of a High-Efficiency Multistage Plasma Thruster
… has been in research, development, and production at Thales Electron Devices in Germany. This High Efficiency Multistage Plasma Thruster, or HEMPT, has promising lifetime capabilities due to its plasma confinement system. However, the permanent magnet system that offers this and other benefits …
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Turbo Charged Low Temperature Combustion - Experiments, Modeling and Control
… on the availability of reliable transportation. Most transportation technology involves the use of internal combustion engines in one way or another. Because of the large numbers of internal combustion engines in use around the world, their emissions have a significant environmental impact. …
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Ion collection by a conducting sphere in a magnetized or drifting collisional plasma
Ion collection by dust grains and probes in plasmas with a neutral background is of interest in the study of both space and terrestrial plasmas, where charge-exchange collisions can play an important role in ion collection. Further, background drifts or magnetic fields can significantly affect the …
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The fast atom bombardment mass spectrometric analysis of the carbamate pesticide carbaryl
… Mass spectra were obtained in the positive ion-mode using both 2-nitrophenyloctyl ether (NPOE) and 3-nitrobenzyl alcohol (NBA) as matrix liquids. The sample was applied by three different techniques; simple mixing, solvent mixing and surface precipitation. Smaller volumes of matrix liquid …
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Radio-Frequency Plasma Expansion in Different Magnetic Nozzle Configurations
… effects of magnetic field strength and orientation on plasma expansion and ion acceleration when the location of plasma excitation is decoupled from the magnetic nozzle (MN) throat with the aim to improve the efficiency of radio-frequency plasma thrusters and explore the feasibility of magnetic …
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Development of planar langmuir probes for supersonic plasma flows
… are a long established tool for the investigation and char- acterization of plasmas. Diagnostic use of planar Langmuir probes in sta- tionary low temperature plasmas is a well understood and long established technique. When the plasma possesses a drift velocity greater than the ion sound speed …
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Thermal and low-energy ion doping of silicon(001) during molecular beam epitaxy: Dopant incorporation kinetics and mechanisms
Thermal and accelerated-ion doping, with In and Sb, during Si(001) molecular-beam epitaxy were investigated as a function of growth temperature T$\sb{\rm s}$ (500-1050$\sp\circ$C), dopant energy E$\sb{\rm d}$ (thermal-500 eV), and Si deposition rate R$\sb{\rm Si}$ (0.18-4.7 $\mu$m h$\sp{-1}).$ …
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Collocation Based Meshless Methods for Microelectromechanical Systems
… for the Poisson and Nernst-Planck (PNP) equations, a tool for the simulation of ion transport in the framework of the meshless methods has been developed. Furthermore, this tool has been used to study the electrokinetic transport in a hybrid micro-nanofluidic interconnect device, which is …
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Collisionless ion collection by non-emitting spherical bodies in E x B fields
The three-dimensional interaction of a magnetized, collisionless flowing plasma with a non-emitting conducting sphere is solved in the entire range of physically allowed parameters, in the ion-collecting regime. This can be considered as the "spherical Mach probe" problem, establishing how the ion …
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