196,257 research outputs found
The Portrayal of Magdalene Laundries in the Novels of V. S. Alexander and Lisa M. Odgaard
No full textTáto bakalárska práca analyzuje fakty o Magdaléniných práčovniach a porovnáva ich s vybranými literárnymi dielami zaoberajúcimi sa danou témou: The Magdalen Laundries: A Novel Inspired by True Events od Lisy M. Odgaard a The Magdalen Girls od V. S. Alexandera. Práca skúma, aké praktiky osvojené práčovňami a spoločnosťou si autori vybrali a hodnotí ich správnosť. Môžeme vyvodiť záver, že oba romány uvádzajú veľa opisov odzrkadľujúcich realitu, no zároveň do určitej miery idealizujú niektoré situácie.This bachelor's thesis analyses the facts about the Magdalene laundries and compares them with the selected works of literature dealing with the topic: The Magdalen Laundries: A Novel Inspired by True Events by Lisa M. Odgaard and The Magdalen Girls by V. S. Alexander. The work scrutinises the authors' choice of practices adopted by the laundries and society and examines their accuracy. It can be concluded that both novels present many descriptions reflecting the reality but also, to some extent, idealise some situations.Ústav moderních jazyků a literatu
Local durability optimization of a large-scale direct methanol fuel cell: catalyst layer tuning for homogeneous operation and in-operando detection of localized hydrogen evolution
No full textLifetime limitations are still penalizing direct methanol fuel cell technology, otherwise outstandingly promising for sustainable portable power generation. Strong heterogeneous performance fading, related to uneven operating conditions, is known to be exacerbated in the upscaling process towards commercial applications, especially at local level. This work applies a localized optimization strategy, previously developed on lab-scale samples, on a commercial 180 cm2 membrane electrode assembly, analysing both current and potential distribution by means of a custom macro-segmented fuel cell provided with array of reference electrodes. Analysis based on local polarization curves and impedance spectroscopy demonstrates that water distribution, leading to local dehydration as well flooded areas, drives uneven operation and fading. Consequently, platinum loading at cathode electrode has been redistributed, sensibly improving current density heterogeneity and stability (voltage decay rate decreased from 148 to 53.8 μV h−1) over a 600 h degradation tests. Then, residual fading identified at outlet regions has been investigated by means of local electrodes potential analysis, demonstrating a highly uneven operation of both electrodes. This phenomenon is discussed as the evidence of localized hydrogen evolution, which is identified for the first time during nominal galvanostatic operation and suspected to contribute to uneven fading of components
Local optimization of PEMFC and DMFC catalyst layers components for improved durability
No full textBoth proton exchange membrane (PEMFC) and direct methanol fuel cells (DMFC) technologies are limited in durability by a severe performance degradation determining a strongly localized heterogeneous components fading. Avoiding such localized early aging in critical areas could lead to improved durability for the overall device.
A custom macro-Segmented fuel cell hardware, provided with local reference electrodes, has been developed to perform a detailed local investigation of performance and durability. The analysis revealed uneven current distribution during operation, most likely due to uneven reactants and products distribution, particularly related to components localized flooding or dehydration. Inhomogeneous performance distribution showed a strong impact on MEA heterogeneous fading, revealing analogies between the two technologies. Local optimization of catalyst layers formulation and operating protocol have been developed, assisted by modeling simulations, aiming to an homogeneous operation. Important improvements have been obtained on durability, demonstrated by local degradation testing and by post-mortem analysis of samples, confirming the validity of the methodology and the large scope for improvements still available
Dr. Duane M. Jackson, Morehouse College, July 2011
No full textThis video is a conversation with Dr. Duane M. Jackson. Dr. Jackson talks about his paper, "Recall and the Serial Position Effect: The Role of Primacy and Recency on Accounting Students' Performance." Jackie Daniel, AUC Woodruff Library, is the interviewer
"Reflections on the subject of Emigration from Europe with a view to Settlement in the United States" By M. Carey.
No full text"Reflections on the subject of Emigration from Europe with a view to Settlement in the United States: containing bried sketches of the moral and political character of those states.
By M. Carey, member of the American philosophical, and of the American Antiquarian Society, and author of The Olive Branch, Cindiciae Hibernicae, essays on banking, on political economy, and on internal improvement.
To which are now added the English editor's comments on the subject; together with Important Advice to Emigrants, and Cautions Against Impositions Practiced in the Outports
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Dr. Glendon Swarthout
No full textHosted by Roger M. Busfield, MSU Assistant Professor of Speech and Theater, Meet the Author is designed to introduce a general audience to a contemporary author and their work through in-depth interviews. This episode features a conversation between Dr. Glendon Swarthout, prolific author and English professor at MSU, and assistant professors Sam S. Baskett and Theodore B. Strandness
Analysis of the effect of catalyst layer thickness on the performance and durability of platinum group metal-free catalysts for polymer electrolyte membrane fuel cells
No full textDevelopment of platinum group metal-free catalysts for polymer electrolyte membrane fuel cells is a critical target to obtain a high market share of fuel cell electric vehicles in the long term. Recent studies have proved the feasibility of new materials with high catalytic activity towards the oxygen reduction reaction, which are based on Earth-abundant and low-cost elements. The stability of these materials is now the major concern at the current state of the art: In the initial hundreds of hours of operation, in fact, a significant loss of catalyst activity is observed. In the present work, the analysis of performance and degradation of cathode catalyst layers based on metal-nitrogen-carbon materials is carried out for 150 hours. The effects of catalyst loading and ionomer content are being analyzed. Electrochemical impedance spectroscopy is adopted to gain insight into the ageing and the results are interpreted by means of a 1D physics-based model. A regime is reported to occur, in which ion, electron and oxygen transport limitations interplay and the effect of each phenomenon is distinguished on the impedance spectra and polarization curves. Degradation is shown to mainly affect the catalyst activity or the density of active sites, but also a loss of electrical and ionic conductivity is observed
Simulation of thermal plant optimization and hydraulic aspects of thermal distribution loops for large campuses
No full textFollowing an introduction, the author describes Texas A&M University and its utilities system. After that, the author presents how to construct simulation models for chilled water and heating hot water distribution systems. The simulation model was used in a $2.3 million Ross Street chilled water pipe replacement project at Texas A&M University. A second project conducted at the University of Texas at San Antonio was used as an example to demonstrate how to identify and design an optimal distribution system by using a simulation model. The author found that the minor losses of these closed loop thermal distribution systems are significantly higher than potable water distribution systems. In the second part of the report, the author presents the latest development of software called the Plant Optimization Program, which can simulate cogeneration plant operation, estimate its operation cost and provide optimized operation suggestions. The author also developed detailed simulation models for a gas turbine and heat recovery steam generator and identified significant potential savings. Finally, the author also used a steam turbine as an example to present a multi-regression method on constructing simulation models by using basic statistics and optimization algorithms. This report presents a survey of the author??s working experience at the Energy Systems Laboratory (ESL) at Texas A&M University during the period of January 2002 through March 2004. The purpose of the above work was to allow the author to become familiar with the practice of engineering. The result is that the author knows how to complete a project from start to finish and understands how both technical and nontechnical aspects of a project need to be considered in order to ensure a quality deliverable and bring a project to successful completion. This report concludes that the objectives of the internship were successfully accomplished and that the requirements for the degree of Degree of Engineering have been satisfied
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