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 21 for “"Current Collection"”.
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Numerical study of current collection by an orbiting bare tether
… electrons. Collected electrons are driven as a current inside the tether and emitted from the other end. The current interacts with the geomagnetic field and produces Lorentz force (forward or backward). Drag force is obtained by deploying the tether upwards and collecting electrons through the …
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Electron current collection by a positively charged tether using a particle-in-cell method
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1998.
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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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Kinetic modeling of electrodynamic space tethers
… satellites. On the one hand, when driven by a current, their interaction with the Earth's magnetic field creates a thrusting Lorentz force. On the other hand, current can be collected from the ionospheric electrons, which also creates a drag. Although the principle is simple, one theoretical …
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Studies on the dynamics of limited filaments
… propagation are based on a circuit model of current closure loops within the filament and are described herein. Two experimental configurations based on different modes of filament generation are utilized in the Versatile Toroidal Facility (VTF) to test the model. Along with the experimental …
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Dynamics of an Electrodynamic Tether System in a Varying Space-Plasma Environment
… connected by a long tether that generates current to produce either power or thrust via the system's electromagnetic interaction with the space environment. Previous electrodynamic tether investigations decouple the interaction between the tether and the constantly changing plasma …
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Collection development of non-Christian religious holiday books in elementary school libraries
… about non-Christian holidays. Elementary library collections may under-represent non-Christian religious books because of a lack of school library media specialists' personal knowledge about non-Christian holidays. This study surveyed school library media specialists through a written …
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A school library collection analysis focused on resources available for fifth grade research topics
… School were asked to research, (b) whether the current library print collection was sufficient to meet the students' needs in terms of both quantity and quality, (c) the additional print resources which would be necessary to create a useful set of print resources, and (d) the cost of these …
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Pre-K student and teacher access to and use of school library media programs
… of preschoolers serviced per week, rating of current collection for use by preschoolers and teachers, rating of current facility for use by preschoolers and teachers, sources used to build preschool collection, and types of training received for dealing with preschoolers. Approximately 55% of …
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Design and fabrication of field-effect III-V Schottky junction solar cells
… to be electrically isolated from the main current collection contacts, in order to prevent the decrease in Schottky barrier height due to change in applied forward voltage or external load resistance. The electrical and optical characterization results from these Isolated Collection and …
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Immersed Finite Element Particle-In-Cell Modeling of Surface Charging in Rarefied Plasmas
… are carried out using the new algorithm to model current collection and charging in both the orbital motion limited (OML) and space charge limited regime. The first one is a full particle simulation of the charging process of single small sphere and clusters of multiple small spheres in plasma. We …
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Librarians’ book selection practices and budget fluctuations in the City of Cape Town, South Africa
… information to the community it serves. Collection development, which is the process of building and maintaining a library’s collection is, thus an essential part of library services. The selection of materials that align with community needs and interests is an especially important …
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Collisionless ion collection by a sphere in a weakly magnetized plasma
… research. Indeed an understanding of the current collection process by an electrode is relevant to diverse matters such as Langmuir and Mach-probes calibrations, dusty plasma physics, or spacecraft charging. Recent simulations relying on the ad hoc designed code SCEPTIC have fully …
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A Portable Generator Incorporating Mini-Tubular Solid Oxide Fuel Cells
… Cell design, fuel type, fuel flow rate, current-collection method and operating temperature all greatly affected MT-SOFCs performance. Segmenting the cathode significantly increased the power output. Maximum power density from an electrolyte supported MT-SOFC was 140 mW/cm2. The partial …
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Physics-Based Compact Model Development of Field Emitter Arrays
… electric field and potential distributions, the collection velocities of the emitted electrons were calculated, revealing that the current collection at the anode is electrostatically limited due to the deceleration of the electrons in the vacuum channel when the anode bias is below the gate …
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Verified collection-based regression test selection via an extended Jinja semantics
… set of locations. Problems with Ekstazi's current collection location set that make it not safe are identified, and a modified set that will make it equivalent to the safe set is presented. The theorems given in this thesis have been formalized in the theorem prover Isabelle. The RTS …
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Carrier transport, recombination, and the effects of grain boundaries in polycrystalline cadmium telluride thin films for photovoltaics
… (CdTe), a chalcogenide semiconductor, is currently used as the absorber layer in one of the highest efficiency thin film solar cell technologies. Current efficiency records are over 22%. In 2011, CdTe solar cells accounted for ~8% of all solar cells installed. This is because, in part, …
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The information needs of lecturers at the Cape Technikon and the ability of the Technikon Library to meet those needs
… provide a comprehensive literature searching and current awareness service for the many lecturers who were having to prepare lectures in new subject areas; (b) because of the importance of the Library to lecturers, it must be adequately staffed and financed; (c) attention must be given to the …
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Understanding electronic and optical properties of PbS QDs for improved photovoltaic performance
… 90% of installed solar PV capacity as the clear current leader among PV technology, another class of solid-state solar cells, referred to as quantum dot (QD) solar cells, have gained much attentions from both academia and industry with the ability to provide further substantial enhancement of PV …
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