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Preparation and characterization of dense electrolyte films for solid oxide fuel cellsHuang, Jin-Bang 22 July 2009 (has links)
In the past few years, YSZ (Yttria Stabilized Zirconia) had been the dominate electrolyte material of high temperature (>1000¢J) solid oxide fuel cells (SOFCs). Nowadays, CGO (Cerium Gadolinium Oxide) material has been considered as preferred electrolytes for solid oxide fuel cells (IT-SOFCs) used in the temperature range of 600¢J~800¢J due to their excellent oxygen-ion conductivity compared to YSZ. The performance of unit cells can be improved when an anode functional layer (AFL) is employed between the anode composite substrate and the electrolyte. Therefore, AFL has been a lot of use in SOFCs
In this study, the deposition system of EAVD (Electrostatic Assisted Vapor Deposition) was employed to deposite CGO electrolyte films and NiO-CGO anode functional layer. In this study, deposition parameters such as deposition temperature, flow rate and concentration of precursor solution were varied to figure out their effects for the resultant films. Finally, the OCV of unit cells was also measured in this study.
In this work, the optimum concentration of precursor solution for NiO-CGO anode functional layer and CGO films were 0.2 M and 0.3 M, respectively. The optimum deposition temperature and flow rate for this two films were both 400¢J and 6 mL/hr, respectively. When the cells were test with H2 as fuel and air as oxidant, the unit cell of Ni-CGO/CGO/BSCF with CGO film thickness of 25 £gm exhibited an maximum OCV of 0.86 V at 500¢J and the other unit cell of Ni-CGO/AFL/CGO/BSCF with 25 £gm CGO film thickness and 10 £gm AFL exhibited an maximum OCV of 0.91 V at 500¢J.
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Closure: Transforming Source Code for Faster FuzzingPaterson, Ian G. 27 May 2022 (has links)
Fuzzing, the method of generating inputs to run on a target program while monitoring its execution, is a widely adopted and pragmatic methodology for bug hunting as a means of software hardening. Technical improvements in throughput have shown to be critical to increasing the rate at which new bugs can be discovered time and time again. Persistent fuzzing, which keeps the fuzz target alive via looping, provides increased throughput at the cost for manual development of harnesses to account for invalid states and coverage of the programs code base, while relying on forking to reset the state accrued by looping over the same piece of code multiple times. Stale state can lead to wasted fuzzing efforts as certain areas of code may be conditionally ignored due to a stale global. I propose Closure, a toolset which enables programs to run at persistent speeds while avoiding the downsides of stale state and other bottlenecks associated with persistent fuzzing. / Master of Science / The process of program testing to find bugs is becoming increasingly automated. A current method called "Fuzzing", is a widely adopted means for finding bugs and is required in the life cycle of program development by major companies and the US Government. I look at current improvements in fuzzing, and expand the use case of the cutting edge method called persistent fuzzing to a wider array of applications with my tool Closure. With Closure, fuzzing practitioners can experience faster fuzzing performance with less manual effort.
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Speciation, Species Concepts, and Biogeography Illustrated by a Buckwheat Complex (Eriogonum corymbosum)Ellis, Mark W. 01 May 2009 (has links)
The focus of this research project is the complex of infraspecific taxa that make up the crisp-leaf buckwheat species Eriogonum corymbosum (Polygonaceae), which is distributed widely across southwestern North America. This complex provides an ideal taxonomic group for research into population relationships and speciation. To avoid unnecessary debates about taxonomic validity or contentious issues regarding appropriate species definitions, the historical evolution of the species concept is first reviewed in detail, demythologizing an often-assumed species problem. Following that review, the E. corymbosum complex is examined specifically.
Although eight varieties of E. corymbosum are currently recognized based on morphological characters, this group of large, woody shrubs has a history of revisions that demonstrates the uncertainty inherent in circumscriptions based on morphology alone. The apparent rarity of some E. corymbosum varieties also presents conservation and management challenges, demonstrating the need for taxonomic verification.
To bring greater resolution to this group, I genetically tested samples from populations of six of the eight varieties of E. corymbosum, as well as a number of related buckwheat species. With 103 AFLP loci and chloroplast sequence data from 397 samples, I found strong support for the designation of the recently named E. corymbosum var. nilesii. This predominantly yellow-flowered variety had previously been considered part of a more common variety, and thus its management had not been of particular concern. But as a separate variety, its known distribution is quite limited, and management for this rare plant is now advised.
An examination of the biogeography of the E. corymbosum complex provides further support for the apparent rarity of var. nilesii, as well as var. aureum. Both taxa are found at the periphery of the complex, and both may represent insipient species. While all other varieties appear more closely related to each other than to varieties aureum and nilesii, with overlapping ranges confined mostly to the Colorado Plateau, both var. aureum and var. nilesii appear to have allopatric ranges largely off the Colorado Plateau. It appears these two peripheral varieties may each entail a separate center of origin for two new taxa.
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Simulátor určení souřadnic senzorových uzlů / Performance of Anchor-Free Localization in Wireless Sensor NetworkNováček, Aleš January 2010 (has links)
Many applications that use senzor data from a wireless senzor network require corresponding node position information as well, information from the senzors is useful only if node location information is also available. There are many ways to get information about location of senzor, but some are expensive and inefficient. My work presents fully decentralized algorithm AFL (anchor-free localization) for localization of wireless sensors. Aim of my master´s thesis is to describe main features and advantages of AFL and to create program that simulates localization process.
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On Viewing Press Releases of the Texas State AFL-CIO as Rhetorical GenreWelborn, Ronny D. 05 1900 (has links)
Previous scholarship on labor rhetoric has concentrated on the impact of declining union membership and contemporary activist strategies on the part of unions. The press release is a common form of communication that organized labor employs in order to reach its publics. This study explores the press releases of the Texas State AFL-CIO to determine to what extent this level of labor discourse meets the criteria of a rhetorical genre. This study employs the methodology for generic criticism laid out by Foss for identifying genres. The study concludes that a genre of labor rhetoric exists and that the genre was used extensively to promote the Texas State AFL-CIO as a socially-conscious and politically motivated organization.
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No Free Kicks : The Experiences of an Aboriginal Family in Australian Rules FootballHayward, Eric H. January 2002 (has links)
Aboriginal people make a great contribution to Australian sport in conditions of considerable adversity, and yet their contribution goes largely unacknowledged. This study investigates the experiences of one Aboriginal family with an extensive history of involvement with Australian Rules Football using methodologies which seek, and value, Aboriginal perspectives on their involvement. It privileges Indigenous knowledge. The study focuses particularly on the involvement of the Hayward family in Australian Rules Football - the game they love - and in which they have been intensely involved for many generations. The study describes how the Haywards of southwest Western Australia, like most Aboriginal families, experienced an extensive period of colonisation in which their social and cultural autonomy and power were eroded. The historical experience of Aboriginal Australians is vastly different to that of mainstream Australians, and grossly inequitable, not only in terms of economic and educational opportunity, but also in terms of access to sporting opportunities. In many ways, the story of the Hayward family is representative of the experiences of many Black sportsmen and women over the past hundred years. It is suggested that, in order to understand Aboriginal participation and foster the development of Aboriginal sportspeople of all ages, an understanding of the context of their lives is crucial. This study then, explores my extended family's experiences as participants in mainstream sport. It describes how the Haywards, like their community contemporaries, have confronted the limited opportunities afforded to them in their ambitions to gain access, equity of participation, and appropriate reward for effort in their sporting endeavours. / Over many generations of Aboriginal participation in the game, there has been considerable inequality of opportunity to enter and participate. In their efforts to participate, members of the Hayward family faced many obstacles unacknowledged by non-Aboriginal players, administrators and spectators. The study shows that many of these obstacles had little to do with the sporting prowess of the Haywards. Every past and present player interviewed as part of this research told of circumstances where they felt that they had not been given a fair go - be it by an umpire, a team official, opposing players, players from their own team, or the crowd. For every case of acceptance of Aboriginal players by a football club, there are many stories of rejection by other clubs. Despite these obstacles, the study found that the Haywards (like many Aboriginal people) see sport (and particularly football) as significant in their lives. They love the game but, equally importantly, they believe that sporting prowess can open a path of entry to mainstream society, provide important economic advantages and offer opportunities for broader social participation while maintaining strong traditions of Aboriginal virtuosity and relationships. The study concludes by suggesting that, despite the adversities encountered by this family in their desire to participate in football, there has been much in the game that has brought pleasure, a sense of success, satisfaction and achievement to them. While this is the story of one family, I believe it provides important insights into experiences common to many Aboriginal families and sportspersons, and that this research deepens our understanding of Australian social history. Football has been, and continues to be, a valued part of the lives of many Aboriginal people.
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Creating change in the SEIU and the AFL-CIO: The role of identityPeplow, Amber Leigh 29 August 2005 (has links)
The SEIU and the AFL-CIO utilized similar rhetorical strategies in creating identification to further change within their organizations. Despite similar rhetorical strategies, the change efforts differ substantially in terms of success. This dissertation argues that the audience, culture and organizational structure influence the success of the change effort. The dissertation provides implications for rhetorical communication in labor unions.
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Creating change in the SEIU and the AFL-CIO: The role of identityPeplow, Amber Leigh 29 August 2005 (has links)
The SEIU and the AFL-CIO utilized similar rhetorical strategies in creating identification to further change within their organizations. Despite similar rhetorical strategies, the change efforts differ substantially in terms of success. This dissertation argues that the audience, culture and organizational structure influence the success of the change effort. The dissertation provides implications for rhetorical communication in labor unions.
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工會發展之探討—以我國、德國及美國為例 / A study of trade union development-the case of Taiwan, Germany and the United States謝岳峰, Xie, Yue Feng Unknown Date (has links)
我國工會隨著新修正通過的勞動三法與全球工會密度下降的趨勢而面臨嚴格的考驗,然而這樣的考驗也可說是工會發展的契機與展望。本文透過對我國、德國與美國工會的介紹,包括這三個國家工會的歷史背景、特色、現況與困境等做一個整體性的介紹,並對這三個國家的工會相關內容進行簡單比較,除了藉此發現我國工會所面臨的問題外,也透過國外工會經驗提供我國工會做為參考。
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The N.A.A.C.P., the A.F.L.-C.I.O. and the Negro workerGross, James A., January 1900 (has links)
Thesis (Ph. D.)--University of Wisconsin--Madison, 1962. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 190-209).
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