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 53 for “"Power operation"”.
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High-power operation of interferometric gravitational-wave detectors
… for hundreds of kilowatts of circulating optical power. At these high circulating powers, the sensitivity of the detectors to gravitational waves will be limited by the quantum properties of the light: shot noise at frequencies above ~ 100 Hz, and quantum radiation pressure noise at lower …
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PIC simulation of SPT Hall thrusters : high power operation and wall effects
… for the P5 SPT Hall thruster at 3kw and 5kw operation. Performance data agree well with experiments [3], although very low values of anomalous diffusivity must be used for convergence. Particle temperatures and plasma potentials in the chamber are similar to experimental results, although …
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Efficient, high-power operation of CW Yb:YAG and Q-switched Nd:YAG planar waveguide lasers
… medium o ers a good approach to creating a high- power lasers. Excellent thermal properties allow for lasers with good beam-quality and high-e ciency. A Neodymium doped YAG planar waveguide laser was actively Q-switched using a hybrid unstable resonator and acousto-optic modulator. A Yt- terbium …
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Techniques for high data rate modulation and low power operation of fractional-N frequency synthesizers
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.
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A smart motor drive system for domestic and industrial applications
… is required to operate in the so-called constant power region. Constant power, when referred to an electrical motor, is characterised by a constant mechanical output power of the motor at any rated torque and speed. The mechanical output power of a motor is the product of its torque and speed. For …
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On the Power Operations of MU
We study the power opearations of the spectrum $MU$, the complex cobordism theory. After reviewing necessary backgrounds, we start by recalling a formula from Justin Noel and Niles Johnson connecting the power operation $P([\mb{CP}^n])$ for $[\mb{CP}^n]\in MU^*$ with the power operation …
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High-power semiconductor laser arrays by metalorganic chemical vapor deposition
… the capability of producing very high output powers if a large array of diodes can be fabricated. The development of useful high power semiconductor lasers depends on fabrication processes which overcome the problems associated with high power laser operation. This work describes developments …
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A Reconfigurable Digital-to-Analog Converter with Supply Invariant Linearity
… agnostic converter achieves wide supply range operation and re-configurability by being charge based. This converter consists of a 7-bit parallel digital input control core and an analog "summing" core utilizing charging capacitors with an operational transconductance amplifier in a …
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Towards the efficiency limit of visible light-emitting diodes
… of visible light-emitting diodes (LEDs) for high-power operation. By leveraging this special mode of solid-state lighting by incoherent electroluminescent radiation and with the focus on gallium-nitride (GaN) technologies, we experimentally demonstrate a thermally enhanced blue LED operating in …
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Adiabatic Circuits for Power-Constrained Cryptographic Computations
This thesis tackles the need for ultra-low power operation in power-constrained cryptographic computations. An example of such an application could be smartcards. One of the techniques which has proven to have the potential of rendering ultra-low power operation is ‘Adiabatic Logic Technique’. …
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Optimization of a magnetically saturable interior permanent-magnet synchronous machine drive
… are attractive because they can achieve constant-power operation over a wide speed range with limited magnet strength requirements and reduced power electronics cost. These characteristics provide the IPM machine with advantages over alternative machine types in applications such as spindle and …
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Quasi-elliptic cohomology
… Tate K-theory. In Chapter 3 we construct power operation in the orbifold theory, and prove a version of Strickland's theorem on symmetric equivariant cohomology modulo transfer ideals. In Chapter 4 we construct representing spectra but show that they cannot assemble into a global spectrum …
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Design and Development of a Portable Microfluidic System for Medical Diagnostics
… in a portable LOC for fluid storage and low power operation. Finally, I present my work towards realizing a portable instrument that interfaces directly with an LOC to create a simplified user interface. The goal of this research is to take microfluidic LOC technology to the next level where …
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Modulation-Doped Field-Effect Transistors for High-Power Microwave Applications
… of high frequency signals under high-power operation. The linearity of device performance is investigated through the comparison of InGaAs/GaAs PHEMTs and doped channel FETs at dc and rf operation. InP is investigated as a channel material for use in high-power FETs due to the …
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Advancing Ubiquitous Tactile Sensing through Comprehensive Tooling for Resistive Matrix-Based Sensors
… and 3) intermittent data transmission for low-power operation. As a use case for the toolkit, the thesis then introduces a method for the automatic design and fabrication of custom tactile sensing gloves using flexible printed circuit boards (FPCBs), enabling rapid, scalable production. …
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Analysis and characterization of slab-coupled optical waveguide amplifiers and lasers
… significant advantages in size, weight, and power consumption (SWAP) and to their capability for photonic integration. However, these devices traditionally suffer from low fiber coupling efficiency and have been limited to relatively low power applications. This thesis explores the potential …
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An air sampling system to estimate concentrations of argon-41 in the V.P.I. physics building during reactor operation
… locations in the physics building during reactor operation to determine the concentrations of A⁴¹ released to the surroundings of the building during reactor operation. The samples were collected in a one gallon polyethylene bottle with a 3 ¾” x 3 ¾” cylindrical well sealed in the bottom. The air …
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A self-powered single-chip wireless sensor platform
… sensor nodes, wireless connectivity, low power operation and system intelligence. On the other hand, wireless biomedical implants demand additional specifications including small form factor, a choice of wireless operating frequencies within the window for minimum tissue loss and …
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Near junction thermal management of GaN HEMTs via wafer bonding
… (HEMTs) offer excellent performance in power conversion and high frequency power amplification. However, device self-heating limits reliable output power to 1/8th of reported maximums. Device-level thermal management is therefore critical for reliable high power operation. This thesis …
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Analysis of hybrid electrothermomechanical microactuators with integrated electrothermal and electrostatic actuation
… actuation results in low voltage, low power operation that could be used for switching applications in MEMS. We also extend the same device towards bidirectional actuation and demonstrate how it may be used to overcome common problems like stiction that occur in MEMS switches.
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