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1
Modic, David. "Willing to be scammed : how self-control impacts Internet scam compliance." Thesis, University of Exeter, 2012. http://hdl.handle.net/10871/8044.
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At any given moment in time, there are people complying with fraudulent requests (i.e. scams) on the Internet. While the incidence rates are low (between five and ten percent of the population becoming victims on a yearly basis), the financial and emotional consequences can be high. In this Thesis we composed a unified theory of which factors made individuals more likely to comply with scams and what psychological mechanisms are unwittingly employed by con-men to make their (illegitimate marketing) offers more enticing. The strongest overall predictor of scam compliance (i.e. the extent to which an individual is likely to comply with fraudulent requests) was the level of self-control, regardless of the observed stage of a scam. On the basis of previous research, we postulated and have empirically shown that falling for a scam is a 3-stage process (i.e. assessing a scam to be plausible - plausiblity, responding to scammers - responded and, finally, losing utility to them – lost out). Taking this paradigm into account, we analysed the three stages in separate investigations and tested the viability of various psychological factors that play a role in them. We hypothesized that attitudes towards risky choices would play a role in finding an Internet scam plausible and thus started our investigation by transferring one of the classic economic psychological theories (i.e. Prospect Theory) into a virtual setting and demonstrated that risk preferences remain unchanged between concrete and virtual settings. Our investigation showed that attitudes towards risk are similar across virtual and concrete domains, but did not yield a reliable psychometric scale measuring risk preferences. As a corollary, in Chapter 3, we investigated psychological mechanisms that influence risky preferences as applied to all three stages of scam compliance. The empirical investigation in Chapter 3 of the present Thesis focused on social psychological mechanisms of persuasion. A scale of susceptibility to persuasion was developed, validated and then applied to the phenomena of scam compliance in two studies. Four reliable factors contributing to susceptibility to persuasion emerged: influence of authority, social influence, self-control and the need for consistency. The susceptibility to persuasion scale was then used to predict overall lifetime (study 1) and time-limited (study 2) scam compliance across the three stages of scams. Social Influence weakly predicted the plausibility stage in study 1, while strongly predicting the response stage in study 2. The need for consistency strongly predicted response stages in both studies. While compliance with requests from authorities did not predict responses to any of the stages in study 1, it weakly predicted the plausibility of a scam and strongly predicted responding to it in study 2. Weak self-control was a significant predictor of losing funds in study 1 and a strong predictor of responding to scams in study 2. As lack of self-control (as a personality trait) emerged as one of the significant predictors of scam compliance, this led us to infer that there were other personality traits that would contribute to understanding scam compliance. That became the topic of Chapter 4 of the present Thesis. In Chapter 4, we used the five factor model of personality, a brief self-control scale and the UPPS impulsive behaviour scale to measure the impact of personality traits on scam compliance in the response stage. Results showed that extraversion, openness, self-control, premeditation, sensation seeking and (negative) urgency had an influence on the response rates to fraudulent offers. Lack of self-control (as a personality trait) again emerged as a strong predictor of overall scam compliance, which led us to infer that self-control as a cognitive state would also contribute to measuring scam compliance in general and in specific types of fraud. The investigation reported in Chapter 3 showed fraudulent Internet auctions to be an effective scam. As a consequence of these two findings, in Chapter 5, we investigated the impact of self-regulatory fatigue on compliance with fraudulent Internet auctions. In the empirical investigation in Chapter 5 180 respondents in two groups were exposed to a cognitive task designed to be ego-depleting and then to a constructed fraudulent Internet auction. They were asked a series of questions concerned with the likelihood of them purchasing a desired item (i.e. the third stage of a scam) and its appeal to them. We found no evidence that lowered self-control (as a state) had any impact on the appeal of fraudulent offer or the likelihood of purchasing it. We also demonstrated that the perception of risk in the fraudulent Internet auctions is most strongly influenced by the feedback mechanisms and the sellers’ ability to use correct English. In the conclusion to the present Thesis we discussed the implications of our empirical investigations and constructed a fictional fraudulent offer that would be effective according to our research. It should, for example, be based on the advance fee schemes and should be delivered over the Internet to reach the most potential victims. Once we had created an outline of an effective scam, we used that as our starting point to suggest mechanisms that would be effective in resisting it. For example, individuals could employ heuristics in a better way or conduct reality checks; and software toolkits that would help in resisting scams could be developed on the basis of our findings. We also discussed future research directions (obtaining larger samples, focusing on specific types of scams and specific populations; and others) and general implications of our findings.
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Ankeny, Samuel Robert. "Absolute architecture scaled experience /." Thesis, Montana State University, 2007. http://etd.lib.montana.edu/etd/2007/ankeny/AnkenyS0507.pdf.
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Pavek, Jacob Benjamin, and Jacob Benjamin Pavek. "Dynamically Scaled Research Testbed." Thesis, The University of Arizona, 2017. http://hdl.handle.net/10150/625119.
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This report presents the process, analysis, and results of the Dynamically-Scaled Research
Testbed, a ⅓ scale airplane of the X-56A MUTT designed and built by Lockheed-Martin. The purpose of
this scaled airplane is to provide a research platform to investigate flow-separation and boundary layer
transition. The customer requested a modular airplane that can have different wings attached, as well as
a detachable tail section for flight stability and pilot training. This necessitates the following modular
elements: Fuselage section, detachable empennage, sets of different wings, and swappable landing
gear. This team set about analyzing ways to structurally support the wings, flight stability and
performance with and without a tail, building molds to manufacture all airframe components, and wing
bending testing and oscillatory measurement to ensure our airplane meet project requirements. Project
accomplishments and challenges are discussed at the conclusion. All team members contributed in a
number of ways due to the variety of engineering related fields encompassed in this project.
Manufacturing, structural analysis, and purchasing were my primary areas of specialty.
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Scoble, Josephine Margaret. "Diversity of silica-scaled protists." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:7bc73ed7-418b-49de-963b-81407a7c3a49.
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This thesis investigates the diversity of two silica-scaled protist groups, Paraphysomonadida and Thaumatomonadida by light and electron microscopical observations and sequencing (rDNA) on novel clonal cultures. Despite these groups of protist dominating pelagic, littoral as well as inland freshwater and soil habitats, they are taxonomically poorly understood to the extent that any progress in ecological theory is hampered. Now that environmental DNA sequencing is being carried out faster than we can characterise protists from culture it is important that we understand how molecular and physical diversity match up, especially because so many protists are morphospecies. Nearly one hundred isolates were cultured on which both morphological and molecular data was carried out in parallel to reveal around 50 new species of protist from eight different genera: two heterokont genera, Paraphysomonas and Incisomonas n. gen., and six cercozoan genera, Thaumatomonas, Allas, Reckertia, Thaumatospina n. gen., Cowlomonas n. gen., and Scutellomonas n. gen. These data make major contributions to taxonomy and understanding aspects of protist diversity where previously morphological diversity was heavily biased towards over- generalized morphotypes. This thesis quickly showed that gross lumping of morphospecies was true of Paraphysomonas, for which many of the isolates cultured herein might have been regarded as one species (not more than 20). The many cultured isolates exhibited varied cell and scale morphology, and by sequencing (rDNA), it was possible to see the evolution of scale morphology map on to trees. This marriage of molecular and morphological data made it possible to view distinct groups of species that shared scale detail that might have otherwise been overlooked had either method been used alone. This research has shed significant light on how scale morphology can be used as reliable taxonomic marker for protists, the insights of which can be applied to make taxonomic improvements to other silica-scaled protist groups.
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Schray, Jason Garvey. "Scaled Synthetic Aperture Rader Development." DigitalCommons@CalPoly, 2016. https://digitalcommons.calpoly.edu/theses/1675.
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Several previous Cal Poly thesis projects involve synthetic aperture radar (SAR), automatic target recognition (ATR), and tracking. SAR data was either accessed from a publicly available database or generated using complex computer modeling software. The motivation for this dual thesis project is to design and construct a scaled SAR system to support Cal Poly radar projects. Ideally this is a low-cost, high resolution SAR architecture that produces raw range Doppler data for any desired target area. To that end, a scaled SAR system was successfully designed, built, and tested. The current SAR system, however, does not perform azimuthal compression and range cell migration correction. These functionalities can be pursued by future students joining the ongoing radar project.
The system built for this thesis is a 1 GHz bandwidth SAR system. The system is comprised of analog/RF front end circuitry, two antennas, a mechanical rail platform, power supplies, an oscilloscope, and control and image processing software. This thesis covers the design and evaluation of the analog/radio frequency (RF) front end circuitry and signal processing software.
RF amplifier integrated circuits (ICs) were evaluated for two purposes: increasing transmitted signal strength and improving system signal-to-noise ratio (SNR). A voltage-controlled oscillator’s (VCO) tuning characteristic and bandwidth were measured to verify its ability to support system specifications. A ramp generator circuit was designed, assembled and tested. Multiple ultra wide band (UWB) band pass filters were investigated for received signal image rejection. A low pass filter (LPF) was designed, assembled and tested for noise reduction. The overall system was tested with multiple known target locations.
This thesis is a joint project with Ryan Green, MSEE student. To understand the entire project, refer to both thesis documents. The overall project is covered broadly in both papers but each report specializes in selected areas. Ryan Green’s thesis document focuses on the system control software, antenna design, and mechanical rail platform.
This thesis document focuses on the RF circuitry, analog circuitry, and image processing. The introductory section introduces radar system concepts and the SAR system layout. The remaining sections describe component designs, component performance and system results.
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Farrell, Joseph H. "DYNAMICALLY SCALED OBLIQUE FLYING WING." Thesis, The University of Arizona, 2009. http://hdl.handle.net/10150/192337.
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Plekh, M. (Maxim). "Ferroelectric performance for nanometer scaled devices." Doctoral thesis, Oulun yliopisto, 2010. http://urn.fi/urn:isbn:9789514263934.
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Abstract
The work deals with the experimental study of ferroelectric (FE) performance scaling for nanometer-sized devices. In the emerging and advanced devices, it is desirable to couple FE performance with other functions. This requires integration of nanoscale FEs with other materials, which is especially promising in epitaxial heterostructures. Such heterostructures inevitably possess a large lattice mismatch, the effect of which on FE properties is unknown and is in the focus of the present work.
In the study, heteroepitaxial thin and ultrathin films and superlattices of ABO3-type perovskite structure FEs were used, with A = Pb, Ba, Sr, K, and N, and B = Ti, Zr, Nb, and Ta.
FE domains and local polarization switching were explored on the nanometer scale using piezoresponse force microscopy. The experiment was modified that allowed achieving images with high contrast and lateral resolution, and also allowed analysis of nanodomains in lateral capacitor configuration. Local properties were related to a macroscopic response. For this, the method of simultaneous on-wafer low-frequency impedance measurements was optimized allowing studies of thin and ultrathin (to 5 nm) films in a broad range of conditions and regimes.
Experimental studies have reveled phenomena which cannot be explained in the frame of the existing theories. The observed new effects are important for applications such as multistate memory devices, storage capacitors, and FE tunnel junction devices.
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Smith, James Seymour. "Scaled geotechnical centrifuge modelling of gelifluction." Thesis, Cardiff University, 2004. http://orca.cf.ac.uk/54676/.
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This thesis describes the laboratory modelling of gelifluction processes using the geotechnical centrifuge technique. Thirteen 1/10 scale planar slope models were frozen from the surface downwards on the laboratory floor and thawed, also from the surface downwards, under gravitational acceleration of 10 gravities (approximately 98.1 ms'2). A natural sandy silt soil from Quaternary periglacial slope deposits collected in SW England formed the base test material and slope models at gradients 4, 8, 12 and 16 were constructed using this soil. 10% and 20% by weight increments of glaciolacustrine silt and Kaolinite clay were added to the natural soil and a series of slope models were constructed at gradients of 4, 8, and 12 using these soils. Each slope model was subjected to four cycles of freezing and thawing except for the four slope models that underwent rapid slope failure. During thaw, soil temperatures and pore water pressures were recorded continuously, together with soil thaw settlement and surface displacement. Following each experiment, models were sectioned to observe displacement columns that showed the profiles of soil movement and allowed volumetric displacements to be calculated. It was shown that thaw settlement and slope gradient strongly affected the rate of surface movement and the subsurface profile of movement. Increasing slope gradient generated greater amounts of subsurface and surface movement as a function of increased gravitational shear stress. Thawing ice lenses inclined parallel to the slope gradient provided localised zones of microshearing in response to localised low frictional resistance. Rates of movement increased between the 4 and 8 models, but a greater increase occurred between the 8 and 12 models. A slope failure was initiated within the 16 slope model. Rates of gelifluction were dominantly influenced by increasing silt content impacting upon the distribution of segregated ice and the reduction of frictional shear strength. Increasing silt content generated high positive porewater pressures commonly in excess of hydrostatic and consequently greater amounts of pre-failure strain. A clear behavioural threshold was identified between the 10% and 20% silt soils, with far greater gelifluction in the latter than the former. Increasing clay content had a less pronounced impact upon rates of gelifluction when compared to increasing silt due to cohesion. Rates of movement increased between the 10% and 20% clay in response to lower shear strength. A sawtooth style of pore pressure response caused by water escape events within the 20% clay prevented maximum potential pressures being achieved and possibly impacted upon the overall rate of gelifluction. A successful simulation of both landsliding and slow mass wasting processes was undertaken and future applications for the technique have been outlined.
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Hall, Benjamin F. "Combustor simulators for scaled turbine experiments." Thesis, University of Oxford, 2015. https://ora.ox.ac.uk/objects/uuid:9c8e46e6-218f-4715-b2bd-8c8abbee446a.
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Gas turbine combustors employing a single lean combustion stage represent the next generation of design for reduced NOXemissions. These lean-burn combustors rely on swirl-stabilised flames resulting in highly non-uniform outflows. Non-uniform conditions adversely affect high-pressure turbine performance. 3D numerical simulations provide a means to understand and optimise engine design, however, the modelling of turbulence means experimental validation is crucial. Turbine test facilities operating at scaled, non-reacting conditions, with simulated combustor flows are an important source of validation data. This thesis presents advances in combustor simulator design, testing and instrumentation relevant to the challenges of modern, highly-integrated turbine testing. The design of a lean-burn combustor simulator, characterised by swirl and non-uniform temperature, is presented. The design was based on measurements and predictions of engine conditions. Unsteady numerical simulations were employed as a predictive design tool. An engine-scale combustor simulator was manufactured and characterised experimentally in a bespoke facility. Surveys of flow structure are presented, focusing on experimental turbine inlet data. These data confirmed that the combustor simulator reproduces the important features of a lean-burn combustor; e.g. swirling mainstream flow and high turbulence intensity. The lean-burn combustor simulator will be the first of its kind to be implemented in a rotating turbine test facility, and will provide important validation data. Measurement techniques were developed alongside the core work. Miniaturised five-hole probe rakes for turbine inlet measurements were developed using additive manufacturing (AM). Building on this work, an open source AM five-hole probe design is presented with experimental validation. The problem of estimating pressure probe bandwidth was also addressed, and a simplified model is presented. These tools have direct applications in turbomachinery research.
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Allemang, Jane Schueler. "ASSESSING GENDER USING SCALED ANIMAL NAMES." University of Cincinnati / OhioLINK, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=ucin984583633.
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Green, Ryan K. "Scaled Synthetic Aperture Radar System Development." DigitalCommons@CalPoly, 2015. https://digitalcommons.calpoly.edu/theses/1498.
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Synthetic Aperture Radar (SAR) systems generate two dimensional images of a target area using RF energy as opposed to light waves used by cameras. When cloud cover or other optical obstructions prevent camera imaging over a target area, SAR can be substituted to generate high resolution images. Linear frequency modulated signals are transmitted and received while a moving imaging platform traverses a target area to develop high resolution images through modern digital signal processing (DSP) techniques. The motivation for this joint thesis project is to design and construct a scaled SAR system to support Cal Poly radar projects. Objectives include low-cost, high resolution SAR architecture development for capturing images in desired target areas. To that end, a scaled SAR system was successfully designed, built, and tested. The current SAR system, however, does not perform azimuthal compression and range cell migration correction (image blur reduction). These functionalities can be pursued by future students joining the ongoing radar project. The SAR system includes RF modulating, demodulating, and amplifying circuitry, broadband antenna design, movement platform, LabView system control, and MATLAB signal processing. Each system block is individually described and analyzed followed by final measured data. To confirm system operation, images developed from data collected in a single target environment are presented and compared to the actual configuration.
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Kamath, Osler C. "Physiology and control of apple scald." Thesis, This resource online, 1990. http://scholar.lib.vt.edu/theses/available/etd-03122009-040821/.
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Golding, John B., of Western Sydney Hawkesbury University, Faculty of Environmental Management and Agriculture, and Centre for Horticulture and Plant Sciences. "Superficial scald in apples." THESIS_FEMA_HPS_Golding_J.xml, 1999. http://handle.uws.edu.au:8081/1959.7/113.
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Comparative physiological and biochemical studies were conducted with apple varieties which were susceptible (Granny Smith and Lady Williams) and resistant (Crofton) to superficial scald, to understand the mechanisms of scald aetiology. This provided a basis for the development of alternatives to diphenylamine to control the disorder in cool stored apples. The research confirmed earlier research, which showed that the typical scald symptoms were the result of the deposition of brown pigments on the tonoplast in hypodermal and epidermal cells. It has been generally accepted that these pigments were formed by the action of polyphenol oxidase (PPO) following its release from chloroplasts, as a result of membrane damage caused by the oxidation products of alpha-farnesene. However, intact and functional chloroplasts were observed in severely scalded peel tissue. It was proposed that peroxidase (POD) might play a more important role in scald development. The concept that the concentration of alpha-farnesene or its products was related to the severity of scald was examined, and results indicated that differences in scald susceptability were related to the ability of apple tissue to cope with oxidative stress at low temperatures rather than the concentration of alpha-farnesene. If alpha-farnesene has a scald promoting role, it may be as a participant in a free radical chain reaction rather than an initiator. Studies were conducted on the phenolic compounds present in apple peel, which led to the proposal that phenolics might confer scald resistance by conserving other antioxidants and preventing peroxidation of membrane lipids. An holistic model of scald development was proposed, which indicated that scald results from a chilling stress since scald only occurs at temperatures below 4 degrees C and only in apples in which the capacity to protect membranes from oxidative stress is low. The model proposed that POD may have a more important role than PPO in scald development than previously thought.Doctor of Philosophy (PhD)
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Golding, John. "Superficial scald in apples /." Richmond, N.S.W. : Centre of Horticulture and Plant Science, University of Western Sydney, Hawkesbury, 1999. http://library.uws.edu.au/adt-NUWS/public/adt-NUWS20030602.162040/index.html.
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Thesis (Ph.D.) -- University of Western Sydney, Hawkesbury, 1999.Thesis submitted for the degree of Doctor of Philosophy. Copies of related publications in back. Includes bibliographical references (leaves 341-365).
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Zhang, Zhikuan. "Source/drain engineering for extremely scaled MOSFETs /." View abstract or full-text, 2005. http://library.ust.hk/cgi/db/thesis.pl?ELEC%202005%20ZHANG.
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Vu, Thu Hang. "Enhancing the scaled boundary finite element method." University of Western Australia. School of Civil and Resource Engineering, 2006. http://theses.library.uwa.edu.au/adt-WU2006.0068.
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[Truncated abstract] The scaled boundary finite element method is a novel computational method developed by Wolf and Song which reduces partial differential equations to a set of ordinary linear differential equations. The method, which is semi-analytical, is suitable for solving linear elliptic, parabolic and hyperbolic partial differential equations. The method has proved to be very efficient in solving various types of problems, including problems of potential flow and diffusion. The method out performs the finite element method when solving unbounded domain problems and problems involving stress singularities and discontinuities. The scaled boundary finite element method involves solution of a quadratic eigenproblem, the computational expense of which increases rapidly as the number of degrees of freedom increases. Consequently, to a greater extent than the finite element method, it is desirable to obtain solutions at a specified level of accuracy while using the minimum number of degrees of freedom necessary. In previous work, no systematic study had been performed so far into the use of elements of higher order, and no consideration made of p adaptivity. . . The primal problem is solved normally using the basic scaled boundary finite element method. The dual problem is solved by the new technique using the fundamental solution. A guaranteed upper error bound based on the Cauchy-Schwarz inequality is derived. A iv goal-oriented p-hierarchical adaptive procedure is proposed and implemented efficiently in the scaled boundary finite element method.
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Ballard, Lance Dale. "Human-scaled personal mobility device performance characteristics." Thesis, Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/45930.
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Today, numerous alternative modes of mobility are emerging to provide a solution to the problems created by the automobile. This research envisions a future where transportation in urban areas will be dominated by small personal mobility devices (PMDs) instead of automobiles. This Intelligent Mobility System (IMS) would be a car-free zone where people travel by a shared-system of PMDs providing levels of mobility greater than walking but less than a car. This research effort focuses on the operational aspects of this future system by studying PMD performance characteristics as inputs for a computer simulation model of an IMS environment.
Therefore, the primary objective of this research is to evaluate the operations of PMDs that are currently used in a variety of settings. GPS recorders are used to log speed and location data each second of pedestrian, bicycle, Segway, and electric cart trips. Segway speed and acceleration are analyzed using three factors, sidewalk width, surface quality, and pedestrian density to study their effect on Segway speed.
Pedestrians have the lowest mean speed and the most narrow speed distribution. Segways, bicycles and electric carts have increasingly faster mean speeds and wider speed distributions, respectively. Segways and bicycles were found to have similar acceleration distributions. Segways seem to provide a level of speed and mobility between that of pedestrians and cyclists, meaning that Segways might capture new users by providing a level of mobility and convenience previously unseen.
Narrow sidewalk widths, poor sidewalk quality, and heavy pedestrian density all decreased Segway speeds. The researchers suspect that surface quality is likely an independent constraint for Segway speed and that sidewalk width and pedestrian density interact to limit Segway speeds under certain conditions. This research concludes that these external factors may affect PMD speed and should be considered when analyzing PMD mobility, especially in an IMS setting.
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Scholvin, Jörg 1976. "Deeply scaled CMOS for RF power applications." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/37904.
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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2006.Includes bibliographical references (p. 117-140).
The microelectronics industry is striving to reduce the cost, complexity, and form factor of wireless systems through single-chip integration of analog, RF and digital functions. Driven by the requirements of the digital system components, the 90 nm and 65 nm technology nodes are currently emerging as platforms for highly integrated systems. Achieving such integration while minimizing the cost of adding specialized RF modules places high demands on the base CMOS technology. In this regard, the integration of the power amplifier (PA) function becomes an increasing challenge as technology geometries and supply voltages scale down. Gate length (Lg) scaling yields improved frequency response, promising higher power-added efficiency (PAE), a key RF PA consideration. This benefit comes at the cost of a lower drain voltage, which demands a higher output current and thus wider devices in order to produce a given output power level (Po,,). In this work, we have investigated the potential of deeply scaled CMOS for RF power applications, from 0.25 um down to 65 nm. We demonstrate the frequency and power limitations that the different CMOS technologies face, and describe the physical mechanisms that give rise to these limitations.
(cont.) We find that layout considerations, such as splitting a single large device into many smaller parallel devices, become increasingly important as the technology scales down the roadmap, both for power and frequency. We also show that parasitic resistances associated with the back-end wiring are responsible for placing an upper limit on the RF power that can be obtained for a single bond pad. We demonstrate a power density of 31 mW/mm for the 65 nm node, with PAE in excess of 60% at 4 GHz and 1 V. Similar results are obtained in 90 nm, where a peak PAE of 66% was measured at 2.2 GHz and 1 V, with a power density of 24 mW/mm. We find that efficient integrated PA functionality for many applications can be achieved even in a deeply-scaled logic CMOS technology. For low power levels (below 50 mW), we find that the 65 nm CMOS devices offer excellent efficiency (>50%) over a broad frequency range (2-8 GHz). Their RF power performance approaches that of 90 nm devices both in peak PAE and output power density. This is possible without costly PA-specific add-ons, or the use of higher voltage input-output (I/O) device options.
(cont.) However, since I/O devices are often included as part of the process, they represent a real option for PA integration because they allow for higher power densities. The 0.25 /xm I/O device that is available in the 90 nm process, when biased at Vdd = 2.5 V showed excellent results, with a peak PAE of 60% and an output power of 75 mW (125 mW/mm) at 8 GHz.
by Jörg Scholvin.
Ph.D.
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Garverick, Steven Lee. "Large signal linearity of scaled MOS transistors." Thesis, Massachusetts Institute of Technology, 1986. http://hdl.handle.net/1721.1/14931.
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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1987.MICROFICHE COPY AVAILABLE IN ARCHIVES AND ENGINEERING
Includes bibliographies.
by Steven L. Garverick.
Ph.D.
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Guenette, Gerald Roger. "A fully scaled short duration turbine experiment." Thesis, Massachusetts Institute of Technology, 1985. http://hdl.handle.net/1721.1/15249.
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Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1985.MICROFICHE COPY AVAILABLE IN ARCHIVES AND AERO.
Includes bibliographical references.
by Gerald Roger Guenette, Jr.
Sc.D.
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Sistrunk, Emily Frances. "Scaled Strong Field Interactions at Long Wavelengths." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1318518567.
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Dart, Kathleen Louise. "The invisible woman: The lesbian - scared straight." CSUSB ScholarWorks, 2007. https://scholarworks.lib.csusb.edu/etd-project/3307.
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Nyqvist, Hanna E. "On Pose Estimation in Room-Scaled Environments." Licentiate thesis, Linköpings universitet, Reglerteknik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-132735.
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Pose (position and orientation) tracking in room-scaled environments is an enabling technique for many applications. Today, virtual reality (vr) and augmented reality (ar) are two examples of such applications, receiving high interest both from the public and the research community. Accurate pose tracking of the vr or ar equipment, often a camera or a headset, or of different body parts is crucial to trick the human brain and make the virtual experience realistic. Pose tracking in room-scaled environments is also needed for reference tracking and metrology. This thesis focuses on an application to metrology. In this application, photometric models of a photo studio are needed to perform realistic scene reconstruction and image synthesis. Pose tracking of a dedicated sensor enables creation of these photometric models. The demands on the tracking system used in this application is high. It must be able to provide sub-centimeter and sub-degree accuracy and at same time be easy to move and install in new photo studios. The focus of this thesis is to investigate and develop methods for a pose tracking system that satisfies the requirements of the intended metrology application. The Bayesian filtering framework is suggested because of its firm theoretical foundation in informatics and because it enables straightforward fusion of measurements from several sensors. Sensor fusion is in this thesis seen as a way to exploit complementary characteristics of different sensors to increase tracking accuracy and robustness. Four different types of measurements are considered; inertialmeasurements, images from a camera, range (time-of-flight) measurements from ultra wide band (uwb) radio signals, and range and velocity measurements from echoes of transmitted acoustic signals. A simulation study and a study of the Cramér-Rao lower filtering bound (crlb) show that an inertial-camera system has the potential to reach the required tracking accuracy. It is however assumed that known fiducial markers, that can be detected and recognized in images, are deployed in the environment. The study shows that many markers are required. This makes the solution more of a stationary solution and the mobility requirement is not fulfilled. A simultaneous localization and mapping (slam) solution, where naturally occurring features are used instead of known markers, are suggested solve this problem. Evaluation using real data shows that the provided inertial-camera slam filter suffers from drift but that support from uwb range measurements eliminates this drift. The slam solution is then only dependent on knowing the position of very few stationary uwb transmitters compared to a large number of known fiducial markers. As a last step, to increase the accuracy of the slam filter, it is investigated if and how range measurements can be complemented with velocity measurement obtained as a result of the Doppler effect. Especially, focus is put on analyzing the correlation between the range and velocity measurements and the implications this correlation has for filtering. The investigation is done in a theoretical study of reflected known signals (compare with radar and sonar) where the crlb is used as an analyzing tool. The theory is validated on real data from acoustic echoes in an indoor environment.
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Allen, David Paul. "Error quantification of a scaled railway roller rig." Thesis, Manchester Metropolitan University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.364465.
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Min, Jouha. "Nanolayer multi-agent scaled delivery from implant surface." Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/104213.
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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Chemical Engineering, 2016.Cataloged from PDF version of thesis.
Includes bibliographical references.
One of the important problems in the field of orthopedic medicine is the ability to create a stable bone-materials interface with an implant, particularly when faced with the difficult condition of bone infection. Only recently have we come to understand the significance of addressing infection during the bone wound healing process; however, to apply this understanding toward an effective treatment requires the ability to deliver exacting amounts of therapeutics of different types over the appropriate timeframes in and around the implant. This task must be accomplished while maintaining the mechanical integrity of the implant materials and allowing for bone integration on their surfaces. Here we present a novel, particularly enabling next-generation implant solution for both eradication of an established biofilm within the bone cavity and accelerated bone repair via the controlled delivery of antibiotic and growth factor in sequence from stable nanometer scale coatings on the implant surface. Infection is by far the most common reason for complications, which often lead to complete removal of implants (74.3%). Infection significantly increases morbidity, and places huge financial burdens on the patient and the healthcare system-projected to exceed $1.62 billion/year by 2020. Because infection is much more common in implant replacement surgeries, these issues greatly impact long-term patient care for a continually growing part of the population. For revision arthroplasty of an infected prosthesis, a prolonged and expensive twostage procedure requiring two surgical steps and a 6-8 week period of joint immobilization exists as today's gold standard. A single-stage revision is preferred as an alternative; however, traditional bulk polymer systems such as bone cement cannot load sufficient amounts of therapeutic to eradicate existing infection, are insufficient or infeasible for the release of sensitive biologic drugs that considerably aid in bone regeneration, and lead to substandard mechanical properties and retarded bone repair. To address these issues, we created conformal, programmable, and degradable dual therapy coatings (~500 nm thick) in a layer-by-layer fashion using the enabling nanofabrication tool of electrostatic multilayer assembly. The nanolayered construct allows large loadings of each drug, thus enabling ultrathin film coatings to carry sufficient treatment and precise independent control of release kinetics and loading for each therapeutic agent in an infected implant environment. The coating architecture was adapted to allow early release of antibiotics contained in top layers sufficient to eliminate infection, followed by sustained release above the MIC over several weeks; whereas, the underlying BMP-2 growth factor layers enabled a long-term sustained release of BMP-2, which induced more significant and mechanically competent bone formation than a short-term burst release. In rats, the successful growth factor-mediated osteointegration of the multilayered implants with the host tissue improved bone-implant interfacial strength by impressive amounts (15-fold) when compared with the bare implant control, and yields a mechanical bond 17-fold higher than that created with the use of clinically available bioactive bone cement. Here we focused on dual delivery of an antibiotic and a growth factor owing to the urgent need for enhanced infection-reducing and tissue-integrating strategies in orthopedic applications, but the excellent modularity of multilayers for incorporation and release of diverse therapeutics suggests this approach should be also applicable to different implant applications such as vascular graft and artificial heart implants for which the risks of infection are often ignored. Our findings demonstrate the potential of this layered release strategy to introduce a durable implant solution, ultimately an important step forward in the design of biomedical implant release coatings for multiple medical applications. In addition to focusing on multi-therapeutic multilayer coatings for macroscale implants and scaffolds, I have also extended the work to understand release properties of the therapeutic agents, guided by predictive mathematical modeling of the release mechanisms involved in polyelectrolyte multilayer films and cell uptakes based on the principles of polymer physics and molecular and cellular biology. The potential impact of this work is substantial: introduce the next-generation biomaterials and implantable devices, save billions of dollars in the healthcare cost, and directly benefit the rapidly growing current and future generations of patients relying on medical device.
by Jouha Min.
Ph. D.
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Jin, Donghyun. "Quantum capacitance in scaled down III-V FETs." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/58178.
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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2010.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 81-83).
As Si CMOS approaches the end of the roadmap, finding a new transistor technology that allows the extension of Moore's law has become a technical problem of great significance. Among the various candidates, III-V-based MOSFETs represent a very promising technology. In particular, low-effective mass materials with high electron velocities, such as InGaAs and InAs are of great interest. A concern with this approach is the relatively small inversion-layer capacitance that is associated with a low-effective mass channel and the limits that this imposes on the gate capacitance that can be attained from barrier thickness scaling. This can seriously limit the current driving ability of scaled down devices. In order to understand the scaling potential of III-V MOSFETs, we have built a physical gate capacitance model for III-V FETs that incorporates quantum capacitance and centroid capacitance in the channel. We verified its validity with simulations (Nextnano) and experimental measurements on High Electron Mobility Transistors (HEMTs) with InAs and InGaAs channels down to 30 nm in gate length. Our model confirms that in the operational range of these devices, the quantum capacitance significantly lowers the overall gate capacitance. In addition, our experiments suggest a large increase of the in-plane effective mass in very thin channel designs as a result of non-parabolicity, quantum confinement and biaxial compressive strain. This should help to achieve a relatively high electron concentration in future 10 nm high-k dielectric Ill-V MOSFETs. Our study provides a number of suggestions for capacitance scaling in future Ill-V MOSFETs.
by Donghyun Jin.
S.M.
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Cai, Yi 1970. "Aerodynamic performance measurements in a fully scaled turbine." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/47406.
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Ducharme, Eric Henriot. "Velocity scaled aeroelastic testing of an unducted fan." Thesis, Massachusetts Institute of Technology, 1987. http://hdl.handle.net/1721.1/14654.
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Karimpour, Mazdak. "Lab scaled erosion modeling due to floodwall overtopping." Thesis, Southern Illinois University at Edwardsville, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10191376.
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As the final line of defense against flood, it is important to protect the levees against erosion. The erodibility potential of levee material has an influence on scour generation in levees. In this investigation, the effect of various soil parameters including compaction ratio, plasticity index and saturation ratio on levee erosion due to overtopping is considered. For this purpose, physical models of a typical levee on the banks of Mississippi river with a scale of 1:20 were constructed in the laboratory using a variety of soil types including Non-Plastic Silt, Low-Plastic Clay, and the combination of these two to achieve various soil characteristics for levee material. A sharp wooden plate, which was embedded vertically in the crest of the levee, represented the floodwall.
During the lab tests different geometric and hydraulic parameters of the levee were monitored to identify scour development. In addition, the erodibility of the levee materials was determined using an Erosion Function Apparatus (EFA). The results of EFA tests were compared to physical model test results to explore and discuss the vulnerability of levee systems to erosion with change in levee material characteristics. The results were also compared to levees without floodwalls. The effect of wall inclination was also considered and analyzed. The effect of each soil parameter is discussed in detail on erosion characteristics measured by EFA and levee tests.
These tests and comparisons resulted in the observation that EFA yields lower erosion rates comparing to the simulated levee tests. Increasing the compaction rate and plasticity index improves the erodibility of levee material while increasing in saturation ratio, causes the erodibility of soil to increase. Wall Inclination does not have a significant effect on scour generation while levees without floodwalls show comparatively lower erosion rates.
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Beale, Gregory Thomas. "Radar and LiDAR Fusion for Scaled Vehicle Sensing." Thesis, Virginia Tech, 2021. http://hdl.handle.net/10919/102932.
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Scaled test-beds (STBs) are popular tools to develop and physically test algorithms for advanced driving systems, but often lack automotive-grade radars in their sensor suites. To overcome resolution issues when using a radar at small scale, a high-level sensor fusion approach between the radar and automotive-grade LiDAR was proposed. The sensor fusion approach was expected to leverage the higher spatial resolution of the LiDAR effectively. First, multi object radar tracking software (RTS) was developed to track a maneuvering full-scale vehicle using an extended Kalman filter (EKF) and the joint probabilistic data association (JPDA). Second, a 1/5th scaled vehicle performed the same vehicle maneuvers but scaled to approximately 1/5th the distance and speed. When taking the scaling factor into consideration, the RTS' positional error at small scale was, on average, over 5 times higher than in the full-scale trials. Third, LiDAR object sensor tracks were generated for the small-scale trials using a Velodyne PUCK LiDAR, a simplified point cloud clustering algorithm, and a second EKF implementation. Lastly, the radar sensor tracks and LiDAR sensor tracks served as inputs to a high-level track-to-track fuser for the small-scale trials. The fusion software used a third EKF implementation to track fused objects between both sensors and demonstrated a 30% increase in positional accuracy for a majority of the small-scale trials when compared to using just the radar or just the LiDAR to track the vehicle. The proposed track fuser could be used to increase the accuracy of RTS algorithms when operating in small scale and allow STBs to better incorporate automotive radars into their sensor suites.Master of Science
Research and development platforms, often supported by robust prototypes, are essential for the development, testing, and validation of automated driving functions. Thousands of hours of safety and performance benchmarks must be met before any advanced driver assistance system (ADAS) is considered production-ready. However, full-scale testbeds are expensive to build, labor-intensive to design, and present inherent safety risks while testing. Scaled prototypes, developed to model system design and vehicle behavior in targeted driving scenarios, can minimize these risks and expenses. Scaled testbeds, more specifically, can improve the ease of safety testing future ADAS systems and help visualize test results and system limitations, better than software simulations, to audiences with varying technical backgrounds. However, these testbeds are not without limitation. Although small-scale vehicles may accommodate similar on-board systems to its full-scale counterparts, as the vehicle scales down the resolution from perception sensors decreases, especially from on board radars. With many automated driving functions relying on radar object detection, the scaled vehicle must host radar sensors that function appropriately at scale to support accurate vehicle and system behavior. However, traditional radar technology is known to have limitations when operating in small-scale environments. Sensor fusion, which is the process of merging data from multiple sensors, may offer a potential solution to this issue. Consequently, a sensor fusion approach is presented that augments the angular resolution of radar data in a scaled environment with a commercially available Light Detection and Ranging (LiDAR) system. With this approach, object tracking software designed to operate in full-scaled vehicles with radars can operate more accurately when used in a scaled environment. Using this improvement, small-scale system tests could confidently and quickly be used to identify safety concerns in ADAS functions, leading to a faster and safer product development cycle.
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Tolston, Michael T. "Evaluating the Multi-Scaled Characteristics of Rhythmic Movement." University of Cincinnati / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1439306254.
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Pai, Abhishek. "Distance-Scaled Human-Robot Interaction with Hybrid Cameras." University of Cincinnati / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1563872095430977.
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Prakash, Samvit. "Pricing volatility derivatives using space scaled levy processes." College Park, Md.: University of Maryland, 2008. http://hdl.handle.net/1903/8742.
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Thesis (Ph. D.) -- University of Maryland, College Park, 2008.Thesis research directed by: Applied Mathematics and Scientific Computation Program. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
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Murphy, Terrence Edward. "Multivariate Quality Control Using Loss-Scaled Principal Components." Diss., Available online, Georgia Institute of Technology, 2004:, 2004. http://etd.gatech.edu/theses/available/etd-11222004-122326/unrestricted/murphy%5Fterrence%5Fe%5F200412%5Fphd.pdf.
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Thesis (Ph. D.)--Industrial and Systems Engineering, Georgia Institute of Technology, 2005.Victoria Chen, Committee Co-Chair ; Kwok Tsui, Committee Chair ; Janet Allen, Committee Member ; David Goldsman, Committee Member ; Roshan Vengazhiyil, Committee Member. Vita. Includes bibliographical references.
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Jayasinghe, Mudiyanselage Harshani Dilanka Jayasinghe. "Scaled - Down Open Stoping Under Cemented Paste Fill." Thesis, Curtin University, 2020. http://hdl.handle.net/20.500.11937/79930.
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The principle scope of this research was to develop relationship between stope dimensions and cemented paste fill strength. Experiments in various fill thickness to span width ratios with cemented paste fill with different mechanical properties were conducted by using a constructed scaled-down open stope. Scaled-down laboratory experiments were used to understand the mechanism of fill failure when exposure is undertaken under a relatively fresh fill mass.
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Gutierrez, Maria Soledad <1978>. "Fruit ripening/scald relationship in apple." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amsdottorato.unibo.it/6630/.
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The ripening stage of apple fruits at harvest is the main factor influencing fruit quality during the cold storage period that lasts several months and give rise to physiological disorders in fruits of susceptible cultivars. In particular, superficial scald is connected to α-farnesene oxidation, leading to fruit browning. Therefore, the assessment of the optimal ripening stage at harvest is considered to be crucial to control the overall quality, the length of storage life and the scald incidence. However, the maturity indexes traditionally used in the horticultural practice do not strictly correlate with fruit maturity, and do not account for the variability occurring in the field. Hence, the present work focused on the determination of apple fruit ripening with the use of an innovative, non-destructive device, the DA-meter. The study was conducted on ‘Granny Smith’ and ‘Pink Lady’ cultivars, which differ in scald susceptibility. Pre- and post- harvest ripening behavior of the fruits was studied, and the influence of ripening stage and treatments with 1-MCP were evaluated in relation to scald development and related metabolites. IAD was shown to be a reliable indicator of apple ripening, allowing cultivar-specific predictions of the optimal harvest time in different growing seasons. IAD may also be employed to segregate apple fruits in maturity classes, requiring different storage conditions to control flesh firmness reduction and scald incidence. Moreover, 1-MCP application is extremely effective in reducing superficial scald, and its effect is influenced by fruit ripening stage reached at harvest. However, the relation between ethylene and α-farnesene was not entirely elucidated. Thus, ethylene can be involved in other oxidative processes associated with scald besides α-farnesene regulation.
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Hercules, Judith L. "Differences in lipoxygenase activity as related to cultivar differences in superficial scald of apples." Morgantown, W. Va. : [West Virginia University Libraries], 1999. http://etd.wvu.edu/templates/showETD.cfm?recnum=615.
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Thesis (Ph. D.)--West Virginia University, 1999.Title from document title page. Document formatted into pages; contains vii, 90 p. : ill. (some col.) Includes abstract. Includes bibliographical references (p. 78-88).
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Gill, Mark Richard. "Filtering down : open data in smaller scaled Canadian municipalities." Thesis, University of British Columbia, 2016. http://hdl.handle.net/2429/57590.
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This thesis is a case study examination of open data initiatives in smaller scaled municipalities in Canada. My research questions explore how open data initiatives are being developed and deployed as well as how notions of scale affect these initiatives. I used three avenues of investigation: first, I performed an assessment of district and municipal open data websites in British Columbia; second, I interviewed government open data experts in Western Canada; and finally, I reviewed open data policies from participant governments. From this research, I found that there is a high level of variability in the benefits and challenges associated with offering open data at the municipal and district level. These challenges include: technological barriers to publishing and using data; the current culture around data management; a lack of understanding about who is using open data from a government perspective; and, the need for standardized procedures relating to open data. For governments, challenges associated with open data can create barriers to realizing the potential benefits of open data. In looking at the effect of scale on the development and deployment of open data, two scale effects emerge: the limitation of size and data jurisdiction. In the first, smaller scaled municipalities focus on the size of a municipality as a determining factor for the success of open data. In the second, data jurisdiction produces borders and boundaries for open data users in a way that reifies a traditional data management model. I conclude with recommendations to reduce barriers associated with open data initiatives, and present some theoretical considerations of scale in open data initiatives as groundwork for future research.Graduate Studies, College of (Okanagan)
Graduate
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Tang, Yi. "Digitally-assisted sigma-delta ADCs for scaled CMOS technology /." Thesis, Connect to this title online; UW restricted, 2007. http://hdl.handle.net/1773/5958.
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McConville, Sandra Louise. "Scaled experimental and numerical investigations of auroral radiation phenomena." Thesis, University of Strathclyde, 2009. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=14348.
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Jennings, Joel Philip. "Hidden faces, scaled spaces : Latinos/as in the heartland." Thesis, University of Cambridge, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.605099.
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This dissertation examines the practices and processes that shape Latino/a citizenship through an examination of the Latino/a population in St. Louis, Missouri. This research employs a practice-based notion of citizenship to examine the ways that the Latino/a population, regardless of legal status, is creating lived spaces of citizenship. The study particularly focuses on the ways that emergent geographies of Latino/a citizenship are being contested, and how efforts to establish and defend citizenship claims require scale-specific methods. This investigation draws on data collected during a fourteen month period of fieldwork that entailed the use of qualitative and quantitative methods, including participant observation, extensive in-depth interviews, a quantitative survey and discourse analysis of media reports and printed materials. Data generated includes more than 50 semi- structured interviews, conducted between October 2004 and August of 2005, with several follow-up interviews conducted during the summer of 2006. The study also includes a community survey of 586 Latino/a individuals from around the St. Louis region, which is used to establish a demographic baseline of an extremely fluid immigrant population. I argue that Latino/a residents are creating geographies of political presence in Missouri through the creation of alliances that include Latinos/as of all legal statuses as well as non-Latino/a organizations who support immigrant rights. In the context of municipal governance, in contrast, the Latino/a population is responding to the downward shift of the immigration debate. The Latino/a population in St. Louis is also establishing spaces of citizenship through partnerships between the federal government and local civil society organisations. This dissertation contributes to a growing number of studies theorizing the multi-scalar construction of citizenship.
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Morton, Mark A. "Traction Control Study for a Scaled Automated Robotic Car." Thesis, Virginia Tech, 2004. http://hdl.handle.net/10919/9946.
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This thesis presents the use of sliding mode control applied to a 1/10th scale robotic car to operate at a desired slip. Controlling the robot car at any desired slip has a direct relation to the amount of force that is applied to the driving wheels based on road surface conditions. For this model, the desired traction/slip is maintained for a specific surface which happens to be a Lego treadmill platform. How the platform evolved and the robot car was designed are also covered.
To parameterize the system dynamics, simulated annealing is used to find the minimal error between mathematical simulations and physical test results. Also discussed is how the robot car and microprocessor can be modeled as a hybrid system. The results from testing the robot car at various desired percent slip show that it is possible to control the slip dynamics of a 1/10th scale automated robotic car and thus pave the way for further studies using scaled model cars to test an automated highway system.Master of Science
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Henry, Richard Douglas. "Automatic Ultrasonic Headway Control for a Scaled Robotic Car." Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/36262.
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Intelligent Transportation Systems and supporting technologies have been an active area of research for some time. Human drivers exhibit slower response times and errors in judgment that can have serious adverse affects on traffic flow. These types of errors can be reduced or eliminated from the driving experience by introducing computer control systems into the automotive arena.
The purpose of this research was to develop a scale model platform for the rapid prototyping and testing of ITS systems and technologies. Specifically, this body of work was concerned with the development of an automatic headway control system that utilized ultrasonic sensors. This control system was intended to automatically maintain headway distance in an effort to create an adaptive cruise control system for this scale model vehicle. Implementation of such systems could conceivably reduce driver fatigue by removing the burden of maintaining safe following distance from the driver.
System dynamics of car-like robots with nonholonomic constraints were employed in this research to create a controller for an autonomous path following vehicle. The application of a working kinematic model describing car-like robotic systems allowed the development of a simple first order controller, as well as a sliding mode controller.
Following the development and simulation of these two control laws, the system was applied to the FLASH project scale model vehicle to assess the practical use of the system on a mock highway. A satisfactory result is produced after testing was completed, and the application of such systems to scale model platforms is feasible.Master of Science
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Kaster, Joshua M. "Training Convolutional Neural Network Classifiers Using Simultaneous Scaled Supercomputing." University of Dayton / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1588973772607826.
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Cox, Barry James. "Mathematical modelling of nano-scaled structures, devices and materials." Access electronically, 2007. http://www.library.uow.edu.au/adt-NWU/public/adt-NWU20080129.102240/index.html.
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Welborne, Nathaniel Bryan, Faisal Al-Mahmoud, Khalid Mustafawi, and Cory Pearman. "SCALED MODEL WIND TURBINE WITH ACTIVE FLOW CONTROL TECHNOLOGY." Thesis, The University of Arizona, 2009. http://hdl.handle.net/10150/193022.
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Liu, Shaolong. "SAR ADCs Design and Calibration in Nano-scaled Technologies." Research Showcase @ CMU, 2017. http://repository.cmu.edu/dissertations/1073.
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The rapid progress of scaling and integration of modern complimentary metal oxide semiconductor (CMOS) technology motivates the replacement of traditional analog signal processing by digital alternatives. Thus, analog-to-digital converters (ADCs), as the interfaces between the analog world and the digital one, are driven to enhance their performance in terms of speed, resolution and power efficiency. However, in the presence of imperfections of device mismatch, thermal noise and reduced voltage headroom, efficient ADC design demands new strategies for design, calibration and optimization. Among various ADC architectures, successive-approximation-register (SAR) ADCs have received renewed interest from the design community due to their low hardware complexity and scaling-friendly property. However, the conventional SAR architecture has many limitations for high-speed, high-resolution applications. Many modified SAR architectures and hybrid SAR architectures have been reported to break the inherent constraints in the conventional SAR architecture. Loop-unrolled (LU) SAR ADCs have been recognized as a promising architecture for high-speed applications. However, mismatched comparator offsets introduce input-level dependent errors to the conversion result, which deteriorates the linearity and limits the resolution and the resolution of most reported SAR ADCs of this kind are limited to 6 bits. Also, for high-resolution SAR ADCs, the comparator noise specification is very stringent, which imposes a limitation on ADC speed and power-efficiency. Lastly, capacitor mismatch is an important limiting factor for SAR ADC linearity, and generally requires dedicated calibration to achieve efficient designs in terms of power and area. In this work, we investigate the impacts of offset mismatch, comparator noise and capacitor mismatch on high-speed SAR ADCs. An analytical model is proposed to estimate the resolution and predict the yield of LU-SAR ADCs with presence of comparator offset mismatch. A background calibration technique is proposed for resolving the comparator mismatch issue. A 150-MS/s 8-bit LU-SAR ADC is fabricated in a 130-nm CMOS technology to validate the concept. The measured result shows that the calibration improves the SNDR from 33.7-dB to 42.9-dB. The ADC consumes 640 μW from a 1.2 V supply with a Figure-of-Merit (FoM) of 37.5-fJ/conv-step. Moreover, the bit-wise impact of comparator noise is studied for LU-SAR ADCs. Lastly, an extended statistical element selection (SES) calibration technique is proposed to calibrate the capacitor mismatch in SAR ADCs. Based on these techniques, a high-resolution, asynchronous SAR architecture employing multiple comparators with different speed and noise specifications to optimize speed and power efficiency. A 12-bit prototype ADC is fabricated in a 1P9M 65nm CMOS technology, and fits into an active area of 500 μm × 200 μm. At 125 MS/s, the ADC achieves a signal-to-noise-and-distortion ratio (SNDR) of 64.4 dB and a spurious-free-dynamic-range (SFDR) of 75.1 dB at the Nyquist input frequency while consuming 1.7 mW from a 1.2 V supply. The resultant figure-of-merit (FoM) is 10.3 fJ/conv-step.
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Kopchick, Laura A. (Laura Ann). "Scam King." Thesis, University of North Texas, 1994. https://digital.library.unt.edu/ark:/67531/metadc500605/.
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"Scam King" is a full-length feature screenplay and follows standard script format. The idea behind "Scam King" came originally from the James Joyce short story "Two Gallants" in Dubliners. "Scam King" is, however, not an adaption of Joyce's story, but rather was inspired by the gaps in his story pertaining to the characters' way of life on the street.
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Scott, P. J. "SCALD-1 : Towards an intelligent authoring system." Thesis, University of Sheffield, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.384675.
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Abalharth, Mahdi Hadi. "Using LiDAR to detect in-stream woods : a scaled approach." Thesis, University of British Columbia, 2013. http://hdl.handle.net/2429/45128.
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In-stream woods significantly influence watershed hydrology, flow regime, channel morphology and stability, and processes in streams. Consequently, in-stream woods play a major role in the existence and conservation of riparian and aquatic ecosystems. In this thesis, I attempt to detect and quantify LWD in stream channels using a remote sensing method, LiDAR, in conjunction with the traditional fieldwork. To the best of my knowledge, LiDAR-based analysis has not been used to study woods in stream channels. I, initially, attempted to re-apply advanced medical image processing and segmentation techniques on the LiDAR intensity images in order to confine the LiDAR terrain-based analysis to the stream channel networks, optimizing time and computing resources. The results exhibited significant image enhancement and accurate segmentation in certain regions; however, an automatic and a unified framework to delineate the stream channel networks, across different scales and spatial locations, is still required. LiDAR-based analysis demonstrated a more comprehensive solution for detecting in-stream woods in relation to the fieldwork through a high rate of commission and a low rate of omission. The filtered approach predicted the presence of 95% of fieldwork-reported in-stream woods, highlighting a 5% rate of omission, but with 25% rate of commission indicated by the identification of at least 15 new LWD locations that were not initially reported by the field crew. The non-filtered approach identified 87% of field-reported LWD, highlighting a 13% rate of omission and, similar to the filtered approach, a %25 rate of commission. Overall, the non-filtered and the filtered LiDAR showed fairly accurate predictions for in-stream woods’ dimensional measurements (length, width, and height) with respect to the field data. However, the filtered approach showed better dimension estimation of in-stream woods compared to the unfiltered LiDAR. Although a margin of error existed for fieldwork and LiDAR methods, a careful examination of orthophotos showed that LiDAR results were more accurate than the Laser Range Finder (LRF) used in the field.