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 107 for “"Traveling wave"”.
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Traveling-wave charged particle generation
Massachusetts Institute of Technology. Dept. of Naval Architecture and Marine Engineering. Thesis. 1967. Nav.E. (Also M.S. in Electrical Engineering).
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Relativistic harmonic gyration traveling-wave tube amplifier experiments
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1995.
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An Analysis of Traveling - Wave Mixer Structures (Signal Processing)
Models are developed for traveling-wave delay line transfer functions and for Schottky barrier diodes. These are combined to form models of real time convolver devices. These functions are implemented utilizing acoustic charge transport technology, an approach which permits broad band delay lines, …
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Design of effective traveling wave sloshing absorbers for structural control
A liquid sloshing absorber is a container partially filled with liquid. The primary objective of this thesis is to contribute to the understanding of rigid liquid sloshing absorbers with shallow depths, in structural control applications. An effective means of using intentionally induced liquid …
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High-efficiency, low-loss Floquet Josephson Traveling Wave Parametric Amplifier
… the expense of the other; for example, Josephson traveling wave parametric amplifiers (JTWPAs) are highgain, broadband, and chip-based quantum amplifiers that conventionally incur a bandwidth-noise tradeoff. When operated at 20-dB gain and instantaneous bandwidths of a few GHz, JTWPAs typically …
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Turbulent Boundary Layer over a Piezoelectrically Excited Traveling Wave Surface
Recent studies have utilized spanwise traveling waves to alter the turbulent boundary layer with the aim of reducing skin friction drag. Spanwise traveling waves are a promising active drag reduction technique; however, the wave generation methods used in previous studies are bulky and could not be …
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Electrokinetic pumping of semi-insulating liquids by traveling wave high voltages
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1989.
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One-terminal traveling wave-based protection for HVAC and HVDC transmission lines
This work proposes developing one-terminal traveling wave-based transmission line protection methods for HVAC (High Voltage Alternating Current) and HVDC (High Voltage Direct Current) systems. It considers the effect of the sampling frequency on the protection, which until now has not been …
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Stochastic electron trajectories and wave interaction in relativistic gyro-traveling wave amplifiers
Gyro-traveling-wave amplifiers (gyro-TWAs) are types of gyrodevices, which take advantage of the cyclotron maser instability to produce coherent electromagnetic (EM) radiation from electrons gyrating in an external magnetic field and interacting with fast traveling waves. For high power …
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Design and test of a 94 GHz overmoded traveling wave tube amplifier
… the design and test of an overmoded W-band Traveling Wave Tube (TWT). The TWT was designed to operate in the rectangular TM31 cavity mode at 94 GHz. The unwanted lower order, TM₁₁ and TM₂₁, modes were suppressed using selectively placed aluminum nitride dielectric loading. Simulations in 3-D …
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Broadband Squeezed Microwaves and Amplification with a Josephson Traveling-Wave Parametric Amplifier
… scientific breakthroughs from gravitational wave detection to biological microscopy enhancement. The generation of highly-squeezed states using superconducting amplifiers is a foundation for quantum optics and quantum metrology in the microwave domain. In superconducting circuits, researchers …
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Quadrupole Strong Focusing for Space-Charge Dominated Electron Beams in Traveling-Wave Tubes
Analysis of quadrupole focusing lattices for high-frequency TWTs is presented. This work is motivated by recent work performed at the Naval Research Laboratory (NRL) which demonstrated an advantageous case for strong focusing employing a Halbach quadrupole lattice. Using realistic Permanent Magnet …
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Development of Small-Footprint Large-Amplitude Tripod (three lambda) Mode Traveling Wave Generator
… and experiment, with the aim of generating a traveling wave of three lamda mode shape (i.e. of three crests and three troughs) along the circumference of both end faces to provide stable, non-rocking drive for ultrasonic micromotors. The FEA results revealed that the said mode shape can be …
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A parametric model for reducing the manufacturing cost of the traveling wave tube
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1995.
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Study of space-time evolution of flux in a long-life traveling wave reactor
… the space and time evolution of flux in a Traveling Wave Reactor under constant thermal power condition. For the analyses of flux shape, a 3-D box-shaped model of the reactor is developed. The reactor core is divided into two primary regions: the smaller, enriched region with fissile …
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Modeling multiphysics of traveling wave reactor spent fuel disposal in deep crystalline host rock
… to dispose of the spent fuel of the Travelling Wave Reactor (TWR), an innovative nuclear reactor design. Because significantly higher heat is produced in the central region of the rods than in conventional spent fuel, TWR spent fuel presents new challenges. This work studies the disposal of TWR …
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The Generation and Detection of Squeezed Microwave Photons Realized using Traveling-Wave Parametric Amplifiers
… noise in applications spanning gravitational wave detection, biological microscopy, and quantum information science. In circuit quantum electrodynamics, Josephson parametric amplifiers play a crucial role in quantum-limited amplification and squeezed microwave generation. In this thesis, we …
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Modeling, design, development, and testing of a piezoelectric traveling wave rotary ultrasonic motor for space applications
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1995.
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