118,206 research outputs found
Portrait of Eddie L. Carter Isbell
No full textEddie Carter (later Eddie Isbell) attended Jacksonville State Normal School in Fall 1928.https://digitalcommons.jsu.edu/lib_ac_histimg_1920/1164/thumbnail.jp
Re-examination of Changes in Fluvial Stacking Pattern Across the P-t Boundary in the Central Transantarctic Mountains, Antarctica
No full textA change in fluvial style and a change in the stacking pattern of fluvial channel sandstone bodies occur across the Buckley‒Fremouw formational contact in the central Transantarctic Mountains in Antarctica. Strata in the Buckley Formation are characterized by thick floodplain deposits in the Middle to Upper Permian Buckley Formation; whereas, stacked interconnected sandstone bodies occur in the Triassic Fremouw Formation (Barrett et al., 1986; Isbell & Macdonald, 1991a, 1991b; Collinson et al., 1994; Isbell et al., 1997; 2005). Such changes in fluvial stacking patterns have been attributed to changes in the creation of accommodation within basins due to changes in relative sea level, changes in accommodation due to tectonism, and changes in sediment flux associated with loss of vegetation and increased erosion rates following the end-Permian mass extinction event. To explain the changes in the Buckley-Fremouw Formation in Antarctica, Isbell & Macdonald (1991a, 1991b) and Isbell et al. (1997) argued for changing tectonic conditions in the basin while Retallack et al. (2006) suggested the changes were associated with the P‒T mass extinction event causing the loss of peat forming plants. This study found that the change in the accommodation across the PTB was a result of tectonism based on evidence of changing sandstone composition, changing paleocurrent orientations, and changing fluvial stacking patterns between the Buckley Formation and the Fremouw Formation. This suggests differential subsidence in the Transantarctic foreland basin with an under-filled basin in the Late Permian changing to an over-filled basin in the Early Triassic
Sparse multi-level representations for text retrieval
No full textThesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1998.Includes bibliographical references (p. [153]-160).by Charles Lee Isbell, Junior.Ph.D
Investigating Duolingo English Test Washback
No full textSupplemental files for: Isbell, D. R., Choe, Ann T., Holden, D., Kawasaki, A., Kim, J., Kim, Y., McGehee, M., Nishizawa, H., Park, L., & Tang, A. F. (2026). Investigating Duolingo English Test washback: A focus on test preparation. In B. Naismith, A. A. von Davier, J. Burstein, & G. T. LaFlair (Eds.), Routledge international handbook of digital language assessment: Innovations and insights from the Duolingo English Test (Ch. 18). Routledge
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
Infinite Doubly Stochastic Matrices
No full textThis note proves two propositions on infinite doubly stochastic matrices,
both of which already appear in the literature: one with an unnecessarily
sophisticated proof (Kendall [2]) and the other with the incorrect assertion
that the proof is trivial (Isbell [l]). Both are purely algebraic; so we
are, if you like, in the linear space of all real doubly infinite matrices A
= (aij).Proposition 1. Every extreme point of the convex set of ail doubly
stochastic matrices is a permutation matrix.Kendall's proof of this depends on an ingenious choice of a topology and the
Krein-Milman theorem for general locally convex spaces [2]. The following
proof depends on practically nothing: for example, not on the axiom of
choice.</jats:p
Square Dancing with the Stars to Enhance Dynamic Hirschman Linkages?
No full textIn this Presidential Address, the author takes the reader on a reconnaissance of his life and time as a regional scientist. He points out scenery he found scintillating along the way, hoping that some may pick up the banner and chew on a few of the ideas for a while. He suggests a revisit to Albert O. Hirschman’s notion of key sectors and more empirical analysis related to Marcus Berliant’s and Masahisa Fujita’s notion of knowledge creation and transfer.Presidential Address, San Antonio, Texas, March 29, 2014 (53rd Meetings of the Southern Regional Science Association
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
On w-Isbell-convexity
No full text[EN] Chistyakov introduced and developed a concept of modular metric for an arbitrary set in order to generalise the classical notion of modular on a linear space. In this article, we introduce the theory of hyperconvexity in the setting of modular pseudometric that is herein called w-Isbell-convexity. We show that on a modular set, w-Isbell-convexity is equivalent to hyperconvexity whenever the modular pseudometric is continuous from the right on the set of positive numbers.Olela Otafudu, O.; Sebogodi, K. (2022). On w-Isbell-convexity. Applied General Topology. 23(1):91-105. https://doi.org/10.4995/agt.2022.15739OJS91105231A. A. N. Abdou, Fixed points of Kannan maps in modular metric spaces, AIMS Maths 5 (2020), 6395-6403.https://doi.org/10.3934/math.2020411A. A. N. Abdou and M. A. Khamsi, Fixed point results of pointwise contractions in modular metric spaces, Fixed Point Theory Appl. 2013 (2013):163.https://doi.org/10.1186/1687-1812-2013-163C. Alaca, M. E. Ege and C. Park, Fixed point results for modular ultrametric spaces, J. Comput. Anal. Appl. 20 (2016), 1259-1267.A. H. Ansari, M. Demma, L. Guran, J. R. Lee and C. Park, Fixed point results for C-class functions in modular metric spaces. J. Fixed Point Theory Appl. 20, no. 3 (2018), Paper No. 103.https://doi.org/10.1007/s11784-018-0580-zV. V. Chistyakov, A fixed point theorem for contractions in modular metric spaces, arXiv:1112.5561.V. V. Chistyakov, Metric modular spaces: Theory and applications, SpringerBriefs in Mathematics, Springer, Switzerland, 2015.https://doi.org/10.1007/978-3-319-25283-4V. V. Chistyakov, Modular metric spaces generated by F-modulars, Folia Math. 15 (2008), 3-24.V. V. Chistyakov, Modular metric spaces, I: Basic concepts, Nonlinear Anal. 72 (2010), 1-14.https://doi.org/10.1016/j.na.2009.04.057S. Cobzas, Functional Analysis in Asymmetric Normed Spaces, Frontiers in Mathematics, Springer, Basel, 2012.https://doi.org/10.1007/978-3-0348-0478-3M. E. Ege and C. Alaca, Fixed point results and an application to homotopy in modular metric spaces, J. Nonlinear Sci. Appl. 8 (2015), 900-908.https://doi.org/10.22436/jnsa.008.06.01M. E. Ege and C. Alaca, Some properties of modular S-metric spaces and its fixed point results, J. Comput. Anal. Appl. 20 (2016), 24-33.M. E. Ege and C. Alaca, Some results for modular b-metric spaces and an application to system of linear equations, Azerb. J. Math. 8 (2018), 3-14.R. Espínola and M. A. Khamsi, Introduction to hyperconvex spaces, in: Handbook of Metric Fixed Point Theory, Kluwer Academic, Dordrecht, The Netherlands (2001), pp. 39135.https://doi.org/10.1007/978-94-017-1748-9_13A. Gholidahneh, S. Sedghi, O. Ege, Z. D. Mitrovic and M. de la Sen, The Meir-Keeler type contractions in extended modular b-metric spaces with an application, AIMS Math. 6 (2021), 1781-1799.https://doi.org/10.3934/math.2021107H. Hosseinzadeh and V. Parvaneh, Meir-Keeler type contractive mappings in modular and partial modular metric spaces, Asian-Eur. J. Math. 13 (2020): 2050087.https://doi.org/10.1142/S1793557120500874E. Kemajou, H.-P. Künzi and O. Olela Otafudu, The Isbell-hull of di-space, Topology Appl. 159 (2012), 2463-2475.https://doi.org/10.1016/j.topol.2011.02.016M. A. Khamsi and W. A. Kirk, An Introduction to Metric Spaces and Fixed Point Theory, Pure and Applied Mathematics, Wiley-Interscience, New York, NY, USA, 2001.https://doi.org/10.1002/9781118033074H.-P. Künzi, An introduction to quasi-uniform spaces, Contemp. Math. 486 (2009), 239-304.https://doi.org/10.1090/conm/486/09511H.-P. Künzi and O. Olela Otafudu, q-hyperconvexity in quasipseudometric spaces and fixed point theorems, J. Funct. Spaces Appl. 2012 (2012): Art. ID 765903.https://doi.org/10.1155/2012/765903N. Kumar and R. Chugh, Convergence and stability results for new three step iteration process in modular spaces, Aust. J. Math. Anal. Appl. 14 (2017): 14.Y. Mutemwa, O. Olela Otafudu and H. Sabao, On gluing of quasi-pseudometric spaces, Khayyam J. Math. 6 (2020), 129-140.O. Olela Otafudu, On one-local retract in quasi-metric spaces, Topology Proc. 45 (2015), 271-281.O. Olela Otafudu and H. Sabao, Set-valued contractions and -hyperconvex spaces, J. Nonlinear Convex Anal. 18 (2017), 1609-1617.https://doi.org/10.4995/agt.2017.5818R. C. Sine, On nonlinear contraction semigroups in sup norm spaces, Nonlinear Anal. 3 (1979), 885-890.https://doi.org/10.1016/0362-546X(79)90055-5H. Sabao and O. Olela Otafudu, On soft quasi-pseudometric spaces, Appl. Gen. Topol. 22 (2021), 17-30.https://doi.org/10.4995/agt.2021.13084S. Salbany, Injective objects and morphisms, in: Categorical Topology and Its Relation to Analysis, Algebra and Combinatorics, Prague, 1988, World Sci. Publ., Teaneck, NJ, 1989, pp. 394-409.S. Yamamuro, On conjugate space of Nakano space, Trans. Amer. Math. Soc. 90 (1959), 291-311.https://doi.org/10.1090/S0002-9947-1959-0132378-1C. I. Zhu, J. Chen, X. J. Huang and J. H. Chen, Fixed point theorems in modular spaces with simulation functions and altering distance functions with applications, J. Nonlinear Convex Anal. 21 (2020), 1403-1424
Letter from unknown writer to Jesse L. Boyce
No full textLetter to Jesse L. Boyce from unknown author (possibly Jack) about the investigation into the powder magazine located in the Grand Canyon. Some personal news is included in the letter such as the writer's marriage to the daughter of C.A. Taylor, former Supervisor of Cochise County
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