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 38 for “"nonuniformity"”.
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Non-contact Methods for Detecting Hot-mix Asphalt Nonuniformity
Segregation, or non-uniformity, in Hot Mix Asphalt (HMA) induces accelerated pavement distress(es) that can reduce a pavement's service life up to 50%. Quality Assurance procedures should detect and quantify the presence of this problem in newly constructed pavements. Current practices are usually …
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Influences on post-correction nonuniformity of infrared focal plane arrays
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.
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Modeling and controlling topographical nonuniformity in thermoplastic micro- and nano-embossing
The embossing of thermoplastic polymeric plates is valuable for manufacturing micro- and nanofluidic devices and diffractive optics. Meanwhile, the imprinting of sub-micrometer-thickness thermoplastic layers has emerged as a lithographic technique with exceptional resolution. Yet neither hot …
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Study of scene-based nonuniformity compensation in infrared focal plane arrays
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1996.
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Display spatial luminance nonuniformities: effects on operator performance and perception
… of this research were to develop definitions of nonuniformity, develop accurate measurement techniques, determine acceptable levels of nonuniformities, and to develop a predictive model based on user performance data. Nonuniformities were described in terms of spatial frequency, amplitude, …
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An investigation of shear response of composite material systems
… is also performed for predicting the global nonuniformity of the strain fields. It is shown that the significant nonuniformity in shear deformation observed in experimental results can not be predicted by the existing analytical and numerical models. It is considered that the nonuniformity is …
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Nanocalorimetry of Bismuth Nanoparticles
… Pt metallized sensors. The consequences of this nonuniformity on caloric data are discussed.
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Relative to a random oracle, co-NP [not equal to or included in] IP/poly
… says that since co-NP is uniform, adding nonuniformity to IPᴿ won't be of any help. On the other hand, IP accomplishes surprising things with few resources, and advice is an additional non-trivial resource.
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Effects of upstream wake phasing on the performance of transonic compressors
… of the time-mean relative stagnation pressure nonuniformity associated with the unsteady (but phase-locked) wake vortex flow field. Changes in vortex path mean that the position of this nonuniformity is altered relative to the rotor. There is lower pressure rise, and thus lower work, when the …
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Long-range predictability of high-dimensional chaotic dynamics
… to build predictive models by exploiting this nonuniformity. The algorithm searches for the regions of state space which remain most predictable for a given time into the future. I use the algorithm to investigate the predictability of both model chaotic systems and physical data from a fluid …
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Long range predictability of high dimensional chaotic dynamics
… to build predictive models by exploiting this nonuniformity. The algorithm searches for the regions of state space which remain most predictable for a given time into the future. I use the algorithm to investigate the predictabilty of both model chaotic systems and physical data from a fluid …
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A New Method for Generating Swirl Inlet Distortion for Jet Engine Research
… Swirl distortion is the presence of flow angle nonuniformity in the inlet stream of a jet engine. Although several attempts have been made to accurately reproduce swirl distortion profiles in a testing environment, there has yet to be a proven method to do so. A new method capable of recreating …
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Nanoscale Selective Area Epitaxy for Optoelectronic Devices
… and optoelectronic devices they present. The nonuniformity and random ordering resulting from the self-assembly processes, however, are detrimental to potential applications, prohibiting the type of engineering control necessary for complex systems. The work presented in this document has …
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Fixed pattern noise compensation in a mercury cadmium telluride infrared focal plane array
… traditional temperature references, and provide nonuniformity compensation by using only the statistics of the moving infrared scene and motion of the camera assembly for calibration. Frame averaging is employed, assuming that all of the detector pixels will eventually be irradiated with the same …
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Laser scanner jitter characterization, page content analysis for optimal rendering, and understanding image graininess
… In addition, we provide a metric to measure the nonuniformity of a given halftone texture. The metric indicates that the nonuniformity of irregular halftone textures is higher than the nonuniformity of regular halftone textures. Furthermore, a method to visualize the nonuniformity of given …
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ANALYSES OF INFLUENTIAL FACTORS FOR ACCURATE DETERMINATION OF PEAK RATE FACTORS AND TIMES TO PEAK OF UNIT HYDROGRAPHS
… rainfall characteristics, the time offset, the nonuniformity of rainfall, the extent of nonlinear watershed processes, and the flexibility of the gamma probability distribution function. Guidelines were developed to assist UH users in interpreting the calibration results and calibrating UH …
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An experimental investigation of the effect of temporal equivalence ratio fluctuations on NO<sub>x</sub> emissions in premixed flames
… the effect of temporal unsteadiness and spatial nonuniformity of equivalence ratio on NO<sub>x</sub> emissions. For lean flames, both spatial nonuniformities and temporal fluctuations in equivalence ratio contribute to an increase in NO<sub>x</sub> emissions with respect to steady uniform flames …
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Silicon field emission pressure sensor
… methods to take into consideration the nonuniformity of array tips, an inevitable result from fabrication practice, is also discussed. A study of field emission from silicon-based emitter array is present and various factors to affect the stability of emission are investigated. The …
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