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 24 for “"Noise Measurement"”.
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Spin Shot Noise measurement
Charge shot noise, the intrinsic fluctuations in the electrical current resulting from the statistics of the arrival of discrete electronic charges, was predicted more than a century ago2 and has been an invaluable tool for examining the mechanism of charge transport and the nature of …
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Noise measurement to 40PPM using digital signal processing
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1990.
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A temperature insensitive low noise RC relaxation oscillator
… absence of current source in the RC branch, good noise performance is also achieved. Combined with the comparator offset canceling switch matrix, good temperature stability and noise performance is achieved. Fabricated in the 65 nm CMOS technology, the prototypes achieve an average inaccuracy of …
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Remanent state noise in particulate magnetic recording media
Remanent state noise is the variation in stray flux emanating from a magnetic recording medium which is in a remanent state of magnetisation. A portion of this noise is related to the magnetic microstructure of the recording medium. This study had two main objectives. The first was to devise and …
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Ultra-Narrow Laser Linewidth Measurement
… (LC-RDSHI) for ultra-narrow linewidth measurement, including the theoretical analysis, experimental implementation, further modification on the system and more applications. Recently, less than 1kHz linewidth fiber lasers have been commercialized. But even the manufacturers face a …
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A torsion pendulum ground test of the LISA Pathfinder Free-fall mode
… to measure a residual differential acceleration noise approaching the femto-m/s^2/Hz^1/2 levels needed for eLISA. This measurement is complicated by a large, roughly nm/s^2, stable differential gravitational acceleration that must be actively compensated in order to hold the test particles …
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Man-made impulsive noise on the 137 MHz VHF LEOSAT channel
… been determined by thermal background noise produced internally as well as externally to the radio receiver. Most recently, however, man-made noise has become the dominant source of link interference at VHF frequencies and below. This thesis examines the statistical behavior of man-made …
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Study on corrosion protection of organic coatings using electrochemical techniques: developing electrochemical noise method, effective of surface preparation and inhomogeneity of organic coatings
… as well as development of the electrochemical noise method as an effective assessment method. Surprising and somehow controversial previous findings at the University of Northampton showed an inverse relationship between the roughness of metal substrate and performance of paint coating. So this …
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FABRICATION AND CHARACTERIZATION OF ACTIVE NANOSTRUCTURES
… The levels and origin of low-frequency noise in junctionless transistor devices fabricated from silicon nanowires and also from GeOI devices are reported. Low-frequency noise is an indicator of the quality of the material, hence its characterization can reveal the quality and perhaps …
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Hydrogen concentration and temperature affect the 1/f resistance noise in niobium films
… was studied from 60 K to 400 K. The resistance noise came from hydrogen ions and other defects placed in the films during sputtering. Hydrogen ions cause three types of 1/f noise at different temperatures. The noise is related to internal friction phenomena such as the Gorsky effect and the …
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Hydrogen concentration and temperature affect the 1/f resistance noise in Nb films
… was studied from 60 K to 400 K. The resistance noise came from hydrogen ions and other defects placed in the films during sputtering. Hydrogen ions cause three types of 1/f noise at different temperatures. The noise is related to internal friction phenomena such as the Gorsky effect and the …
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A review and development of accelerated test methods for anti-corrosive organic coatings
… work reported here is on the Electrochemical Noise Measurement (ENM). ENM has been used to monitor coatings under immersion conditions, the aim being to assist a paint company develop a set of more environmentally friendly coatings. The immersion test has also incorporated a temperature cycle …
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Correlation lengths, disorder, and dynamics of vortex matter as heard through the noise
… of experiments measuring flux-flow voltage noise in the type II superconductor 2H-NbSe₂ concentrating on the dynamics and possible phase transitions of vortex matter associated with the peak-effect. I emphasize five conclusions: (1) Traditional models of vortex dynamics relying on purely …
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Efficient Computation of Cohesive Subgraphs in Uncertain Bipartite Graphs
… uncertain due to various reasons such as data noise, measurement error and imprecision of data, leading to uncertain bipartite graphs. In this thesis, we propose the (\alpha,\beta,\eta)-core model, which is the first cohesive subgraph model on uncertain bipartite graphs. To capture the …
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Coating Thermal Noise in Gravitational-Wave Detectors
… like Advanced LIGO and Advanced Virgo is thermal noise arising from the highly reflective multilayer coatings on the test mass mirrors. Reducing this coating thermal noise, particularly its Brownian component, while simultaneously maintaining exceptionally low optical absorption and scatter is …
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The uncertainty in standardised sound power measurements: complying with ISO 17025
… of the most important aspect to deal with is the measurement result. Whenever decisions are based on measurement results, it is important to have some indication of the quality of the results. In every area concerning with noise measurement many standards are available but without an expression of …
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Laser Doppler Vibrometry Based Remote Sensing for Active Noise Control
Demands for active noise control/cancellation (ANC) to provide a quiet environment have grown significantly over the past few decades. Notably, many ANC headphones and earphones have emerged and gained much success in the market due to their excellent performance and robustness. There are also …
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Investigations into the Effect of Temperature on Power-line Corona using Bridge Measuring Techniques
… electrical interference, power loss, and audible noise. Compact power lines require tighter conductor spacings and special high-temperature, low-sag conductors, which makes the accurate prediction of corona behavior even more crucial. This paper examines the impact of conductor temperature on …
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Novel techniques and materials for optical telecommunication systems
… on pump power. A series of characterisation measurements on this laser is presented. These include autocorrelation and optical spectrum measurements of the pulses, frequency resolved optical gating (FROG) characterisation, an interpulse noise measurement, jitter measurements using the RF …
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Effect of Air Temperature, Vehicle Speed, and Pavement Surface Aging on Tire/Pavement Noise Measured with On-Board Sound Intensity Methodology
The study of the traffic noise as an environmental impact, the search for solutions to this problem, and the development of noise measurement methodologies that help in the search of these solutions, is now a fundamental responsibility for the transportation industry. So, in line with this …
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