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 “"mode structure"”.
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Consequences of Mode Structure on Plasma Parameters in Electron Cyclotron Resonance Sources used for Materials Processing
Made available in DSpace on 2017-07-06T18:49:02Z (GMT). No. of bitstreams: 3 Kinder_Ronald_L_MS.pdf: 55983630 bytes, checksum: 14b73a0c7b164993c74cc15004434846 (MD5) Kinder_Ronald_L_MS_ABS.pdf: 637320 bytes, checksum: c1708001642b4606ece902c468dd5af2 (MD5) license.txt: 4813 bytes, checksum: …
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A Comprehensive Study of Hybrid Vertical -Cavity Surface -Emitting Lasers
… with good agreement. For the two single mode structure wafers measured, the VCSELs with the implant aperture located farther away from the active region had the better response. The capacitance of the high speed structure VCSEL, where a deep (through the active region) and wide implant is …
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Development of Optoelectronic Devices and Computational Tools for the Production and Manipulation of Heavy Rydberg Systems
… optical spectrum analyzer for displaying laser mode structure in real time. Utilizing programmable microcontrollers to read data from a CMOS image sensor illuminated by the diffraction pattern from a Fabry-Perot interferometer, this device can operate with beam powers as low as 3.3 micro-watts, …
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Improved temporal coherence and short pulse generation in free electron lasers
… the effect of an optical cavity with an axial mode structure, and how these axial modes may be phase locked, using concepts from conventional lasers, to produce FEL pulses with durations an order of magnitude shorter than those predicted by other short pulse schemes. This technique is called …
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Internal tide generation by tall ocean ridges
… which affect acoustic communication, offshore structures and submarine navigation. This thesis addresses the generation of internal tides by tall submarine ridges using a combined analytical and experimental approach. The first part of the thesis is an experimental investigation of a …
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Investigating the low-frequency stability of BiSON's resonant scattering spectrometers
… is the study of low-degree low-frequency solar p modes from the analysis of high-resolution power spectra generated from 20 years of high-quality data collected by the Birmingham Solar Oscillations Network (BiSON) Resonant Scattering Spectrometers (RSS). To that end we present a novel model of the …
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Mixed Species Ion Chains for Scalable Quantum Computation
… chain in a linear rf trap and their normal mode structure and the thermal occupation numbers of these modes are measured with a narrow band laser addressing an electric quadrupole transition in barium ions. Before these measurements, barium ions are directly cooled using Doppler cooling, …
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Modern spectroscopy on biological molecules : structure and bonding investigated by THz time-domain and transient phase-grating spectroscopy
… correlation between the observed low-frequency modes and molecular structure and association was investigated. Our results show that the mode structure in the THz region represents a unique fingerprint for the molecular structure and conformation, e.g. allowing to distinguish related compounds, …
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Aspects of dynamically enhanced electromagnetic fields from charged relativistic sources in a beam pipe
… are directly related to the source configuration structure. The spectral energy density and spectral transverse field strength are found to have similar frequency response characteristics which differ from those of spectral power. The …fields are found numerically for single pulse sources, which …
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Spectral properties and modes of surface microcavities
… experimental investigations into the transverse mode structure of nearly hemispherical microcavities. The nearly hemispherical microcavity structures are fabricated electrocemically through a template of self assembled latex spheres. Controlling the electrochemical parameters, such as the …
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Chip-based photonic sensors for metrology and applications
Photonic sensors are of crucial importance in modern science and technology. They can be designed to be ultra-sensitive to certain physical quantities, while robust against other physical parameters. Many photonic sensors are compatible with CMOS technology and can be integrated on chips for use as …
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Internal tide generation by tall ocean ridges
… which affect acoustic communication, offshore structures and submarine navigation. This thesis addresses the generation of internal tides by tall submarine ridges using a combined analytical and experimental approach. The first part of the thesis is an experimental investigation of a …
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Multimode Structure of Resistive Wall Modes near the Ideal Wall Stability Limit
… presents the first systematic study of multimode external kink structure and dynamics in a tokamak using a high-resolution magnetic sensor set. Multimode effects are directly measured, rather than inferred from anomalies in single-mode behavior. In order to accomplish this, an extensive set …
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Shearing waves and the MRI dynamo in stratified accretion discs
… gravity, and describe the associated symplectic structure. We continue with a numerical investigation into the linear evolution of the MRI and the undular magnetic buoyancy instability in isolated flux regions and characterise the resultant quasi-linear EMFs as a function of height above the …
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Spectral description of low frequency oceanic variability
A simple dynamic model is used with various observations to provide an approximate spectral description of low frequency oceanic variability. Such a spectrum has wide application in oceanography, including the optimal design of observational strategy for the deployment of floats, the study of …
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Multi-mode cavity effects in the microwave heating of a ceramic slab
… ceramic slab situated in a TE_{M01} cavity is modeled in the small Biot number limit. If the electrical conductivity is an exponential function of temperture and E_0 is the strength of the incident mode, then the relationship between the spatially uniform, steady state leading order …
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Design and Demonstration of a DAB Based RadCom System
… These DAB signals are described by the DAB mode structure, defining their time and frequency domain characteristics. This structure was generalised to describe the RadCom signal and used by the signal generation chain to facilitate the generation of Orthogonal Frequency Division Multiplexed …
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Spectral description of low frequency oceanic variability
A simple dynamic model is used with various observations to provide an approximate spectral description of low frequency oceanic variability. Such a spectrum has wide application in oceanography, including the optimal design of observational strategy for the deployment of floats, the study of …
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Thermally modulated solidly mounted resonators for applications in biosensing
… onto the micro-heater. Additionally, the dual-mode configuration was utilized for temperature measurement using the intrinsic material properties to avoid the use of an external thermometer in order to reduce the circuit complexity. This ovenized SMR structure is capable of performing …
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Miniaturised and reconfigurable planar filters for ultra-wideband applications
… may require a separate RF transceiver and such modern wireless multi-band multi-mode communication systems call for high performance, highly integrated compact modules. Since the Federal Communications Commission (FCC) released the unlicensed frequency band 3.1-10.6 GHz for ultra-wideband (UWB) …
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