177,975 research outputs found
Compte Rendu : R. Thiriez, "The German Envoy's Vision of China, Mumm von Schwarzenstein's Photographic Album, 1900-1902"
No full textCompte Rendu : Revue bibliographique de sinologie, XI-XII, 1994, 125 : R. Thiriez, "The German Envoy's Vision of China, Mumm von Schwarzenstein's Photographic Album, 1900-1902", Visual Resources, IX, 1993, 273-289
Compte Rendu : R. Thiriez, "The German Envoy's Vision of China, Mumm von Schwarzenstein's Photographic Album, 1900-1902"
No full textCompte Rendu : Revue bibliographique de sinologie, XI-XII, 1994, 125 : R. Thiriez, "The German Envoy's Vision of China, Mumm von Schwarzenstein's Photographic Album, 1900-1902", Visual Resources, IX, 1993, 273-289
Mineral exploration under cover: Characterizing mineralizing fluid systems
No full textCopyright © 2006 Elsevier B.V. All rights reserved.Andreas Schmidt Mumm, Christopher Clark and Roger Skirrowhttp://www.elsevier.com/wps/find/journaldescription.cws_home/503342/description#descriptio
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Investigating the mechanisms of phase transformation in t’-YSZ using first principle calculations
No full textInvestigating the mechanisms of phase transformation in t’-YSZ using first principle calculationsBySeyed Amirhossein SaeidiDoctor of Philosophy in Materials and Manufacturing technologyUniversity of California, Irvine, 2019Professor Daniel R. Mumm, ChairPower generation is one of the driving forces of economic growth. Gas turbine engines are one of the main power generation approaches that is in use stationary powerplants and propulsion systems in aviation and naval vessels. A basic design principle for gas turbine engines is that efficiency increases with increasing temperatures; as such, designs and materials allowing higher gas combustion temperatures are desired. To protect the metallic parts, ceramics with low thermal conductivity such as yttria stabilized zirconia (YSZ) are used as thermal barrier coatings. Use of new alternative fuels, with higher hydrogen content than conventional fuels, increase both the temperature and water production during combustion. This new extreme condition has shown to result in faster degradation of YSZ coatings. To understand the mechanisms behind this accelerated degradation, an understanding of the material behavior at the atomic scale under such exposure conditions is necessary, which is the focus of this work. First principles density functional theory (DFT) calculations are employed to study point defects and their interactions in the bulk of YSZ systems in different phase fractions and dopant concentrations. Cation vacancies and anion vacancy-cation vacancy pairs are investigated to determine the rate controlling defects in material aging processes. Equations derived from the grand canonical approach are used to determine the formation energy of defects. The effect of water vapor pressure, temperature and electronic structure of YSZ on these defects are studied. The change in formation energy of cationic defects and their concentrations as a function of the Fermi energy and water vapor pressure are reported. In addition, the possibility of changes in the main defect species responsible for the predominant cation diffusion at varying Fermi energies is presented. The results are used to propose a mechanism that can explain a series of experimental observations showing an acceleration of aging degradation of YSZ coatings under elevated water vapor exposures. The insights offered by this work advance our knowledge and predictive understanding of the aging process in t’-YSZ and give directions for future experimental and theoretical efforts directed at the design of more degradation resistant thermal barrier coatings
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
"Closing the R&D Gap, Evaluating the Sources of R&D Spending"
No full textBoth spending and tax policies have been implemented in the United States with the goal of stimulating private sector research and development (R&D). Karier questions whether current R&D policy, especially the research and experimentation tax credit, can contribute to closing the gap between nondefense expenditures on R&D in the United States and such expenditures in other countries, such as Japan and Germany. He also explores possible changes to our current R&D policy to make it more effective.
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Letter from R. R. Zellick, Assistant Trust Officer, Anglo California National Bank of San Francisco, to Joseph R. Goodman, October 2, 1942
No full textLetter from R. R. Zellick, Assistant Trust Officer at The Anglo California National Bank of San Francisco, to Joseph R. Goodman, regarding property owned by Dave Tatsuno. Zellick mentions a dispute between current tenants and Tatsuno, and that Tatsuno has asked Goodman to help locate trustworthy tenants.Personal correspondence, organizational records, government documents, publications, and other papers created or collected by Joseph R. Goodman documenting the forced removal and incarceration of Japanese Americans during World War II, as well as organized resistance to incarceration. Included in the collection are records of the Japanese Young Men's Christian Association and the Japanese American Citizens' League in San Francisco, including papers of the Japanese YMCA's executive secretary Lincoln Kanai; Sakai family papers; Goodman's correspondence to and from Japanese American incarcerees, organizations opposing forced removal and incarceration of Japanese Americans, the War Relocation Authority, and others; publications, photographs, and ephemera from the Topaz Relocation Center, where Goodman taught high school; War Relocation Authority records and publications; and newspaper clippings, pamphlets, and reports about forced removal and incarceration created by various government, religious, and civic organizations, in California and nationwide
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
Liftings for noncomplete probability spaces
No full textThe current state of knowledge concerning liftings for noncomplete probability spaces is discussed. This is a somewhat expanded version of the author's talk given at the 1991 Summer Conference on General Topology and Applications in Honor of Mary Ellen Rudin and Her Work.PT: S; CR: BURKE MR, IN PRESS P AM MATH S BURKE MR, 1991, ISRAEL J MATH, V73, P33 BURKE MR, 1992, ISRAEL J MATH, V79, P289 CARLSON T, THEOREM LIFTING CHRISTENSEN JPR, 1974, TOPOLOGY BOREL STRUC FREMLIN DH, 1989, HDB BOOLEAN ALGEBRAS, P877 INOESCUTULCEA A, 1966, 5TH P BERK S MATH ST, V2 IONESCUTULCEA A, 1967, CONTRIBUTIONS PROB 1, P63 IONESCUTULCEA A, 1969, TOPICS THEORY LIFTIN JECH TJ, 1978, SET THEORY JOHNSON RA, 1980, P AM MATH SOC, V80, P234 JUST W, IN PRESS T AM MATH S KUPKA J, 1983, INDIANA U MATH J, V32, P717 LOSERT V, 1983, LNM, V1080, P95 MAHARAM D, 1958, P AM MATH SOC, V9, P987 SHELAH S, 1983, ISRAEL J MATH, V45, P90 TALAGRAND M, 1982, P AM MATH SOC, V84, P379 VONNEUMANN J, 1931, CRELLES J MATH, V165, P109; NR: 18; TC: 0; J9: ANN N Y ACAD SCI; PG: 4; GA: BZ86BSource type: Electronic(1
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