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 25273 for “"phase"”.
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Pseudostationary Phase for Solid Phase Extraction
A unique pseudostationary phase for Solid Phase Extraction is presented. This pseudostationary phase consists of surfactant, which is initially immobilized onto hydrophilic cation exchange resin. The surfactant chain through hydrophobic interactions extracts hydrophobic analytes in the same manner …
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DSP phase angle controlled three phase to single phase uninterruptible power supply
Includes bibliographical references.
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Two phase problems and two phase flow
… located at the centre of the base. The two-phase (liquid/gas) region is assumed to be confined to a cone-shaped region and is investigated using Wallis' Drift Flux Model. In the single-phase (liquid) region the turbulent Navier-Stokes equations, written in terms of the stream function, are …
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Phase-field Modeling of Phase Change Phenomena
The phase-field method has become a popular numerical tool for moving boundary problems in recent years. In this method, the interface is intrinsically diffuse and stores a mixing energy that is equivalent to surface tension. The major advantage of this method is its energy formulation which makes …
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Phase Noise in CMOS Phase-Locked Loop Circuits
Phase-locked loops (PLLs) have been widely used in mixed-signal integrated circuits. With the continuously increasing demand of market for high speed, low noise devices, PLLs are playing a more important role in communications. In this dissertation, phase noise and jitter performances are …
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Phase splitting
It became the purpose of this study to design, build and test an electronic oscillator capable of exciting an electrodeless discharge in hydrogen in which the Doppler shifts would be exhibited in a regular manner.
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Transient phase change effect in phase change memory devices
Phase change random access memory (PCRAM) is a leading contender for next generation nonvolatile memory. The phase change mechanism from high resistance amorphous phase to low resistance crystalline phase in nano-timescale is the most important characteristic of these materials. However, full …
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Transient Phase-Change Effect in Phase-Change Memory Devices
Phase-change random access memory (PCRAM) is one of the next-generation memories with the most potential due to its many good characteristics, such as nonvolatility, high endurance and long data retention. PCRAM has the potential to replace flash memory, which has limited durability and speed. …
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DSP controlled three phase to single phase uninterruptible power supply
… problem of balancing a large number of single phase loads onto a three phase supply, such as in a large computer network. This has resulted in more frequent supply voltage failure, causing substantial data and financial loss and in the extreme case death due to hospital equipment not being …
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A 1.6-3.2GHz, high phase accuracy quadrature phase locked loop
… quadrature outputs, and is geared towards low phase noise. The VCO is identified as the limiting factor in the tuning range and source of the quadrature outputs, as well as the primary source of the phase noise above the loop bandwidth of the PLL, so its design is the principle focus herein. …
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Surface acoustic wave single-phase unidirectional transducers and phase weighting
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1985.
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Single-phase vs. Three-phase High Power High Frequency Transformers
… one comparison methodology for single and three-phase high power high frequency transformers in power conversion systems. The objective is to compare the volume of the transformers. And single and three-phase Dual Active Bridge Converter (DAB1 and DAB3) topologies with single and three-phase …
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Compressive phase retrieval
… intensities. This is unfortunate since the phase can reveal important information about the object. When the light is partially coherent, a complete description of the phase requires knowledge about the statistical correlations for each pair of points in space. Recovery of the correlation …
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Dimensional phase transitions
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Physics, 1984.
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Quantitative phase-field modeling of crack propagation in multi-phase materials
… capable of designing micro-architectures of phases to improve fracture toughness and damage tolerance of ZrB<sub>2</sub>-based ultra-high temperature ceramics (UHTCs). A quantitative phase-field model based on the regularized formulation of Griffith’s theory is presented for crack propagation …
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The Dynamics of Phase Separation and Structure Formation in Phase Inversion
Studies of phase inversion are presented, the process by which a cast polymer solution is converted into a porous, polymer gel by either thermal or nonsolvent quenching. In all three of the studies presented in this thesis, in-situ optical techniques have been used to study the dynamics of phase …
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Fast Phase Retrieval: A Robust and Efficient Multidimensional Phase Retrieval Algorithm
We present the first phase retrieval algorithm with a set of deterministic recovery guarantees. We show that for a class of objects known as "Schwarz Objects", the algorithm is guaranteed to reconstruct the object given only the magnitudes of its discrete Fourier transform. We present numerical …
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Acid-phase and Two-phase Codigestion of FOG in Municipal Wastewater
… resulting in less accumulated material. Two-phase codigestion of FOG was also studied using an APD followed by gas-phase (GPD) digesters. The two-phase systems were compared by FOG addition to the APD versus GPD. FOG addition to the APD resulted in 88% destruction of LCFAs, whereas FOG …
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Exploring the heterogeneous uptake of gas-phase PFCAs to the condensed phase
… and partition tendencies. Partitioning of a gas phase chemical from air to water begins with the heterogeneous uptake of the gas-phase molecule onto the liquid’s surface. Heterogeneous reactions are important in identifying sinks and the fate of atmospheric gas-phase chemicals. Currently there …
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