177,358 research outputs found
Psydrax parviflora subsp. rubrocostata Bridson
No full textPsydrax parviflora (Afzel.) Bridson subsp. rubrocostata (Robyns) Bridson — Habit: Small tree. Habitat: LMDF; 1 600–2 800 m. Distribution: I. Voucher: South Mount Kenya, Kiringa R. and Mukengeria R., 5 Mar. 1922, Fries & Fries 2107 (UPS, BR, K). References: Fries & Fries (1929), Verdcourt & Bridson (1991).Published as part of Zhou, Ya-Dong, Mwachala, Geoffrey, Hu, Guang-Wan & Wang, Qing-Feng, 2022, Annotated checklist of the vascular plants of Mount Kenya, East Africa, pp. 1-108 in Phytotaxa 546 (1) on pages 74-75, DOI: 10.11646/phytotaxa.546.1.1, http://zenodo.org/record/655046
Infinite groups with fixed point properties
No full textWe construct finitely generated groups with strong fixed point properties. Let Xac be the class of Hausdorff spaces of finite covering dimension which are mod–p acyclic for at least one prime p. We produce the first examples of infinite finitely generated groups Q with the property that for any action of Q on any X ?Xac, there is a global fixed point. Moreover, Q may be chosen to be simple and to have Kazhdan’s property (T). We construct a finitely presented infinite group P that admits no nontrivial action on any manifold in Xac. In building Q, we exhibit new families of hyperbolic groups: for each n ? 1 and each prime p, we construct a nonelementary hyperbolic group Gn,p which has a generating set of size n + 2, any proper subset of which generates a finite p–group
Dimension of elementary amenable groups
No full textThis paper has three parts. It is conjectured that for every elementary amenable group G and every non-zero commutative ring k, the homological dimension hdk(G)is equal to the Hirsch length h(G) whenever G has no k-torsion. In Part I this conjecture is proved for several classes, including the abelian-by-polycyclic groups. In Part II it is shown that the elementary amenable groups of homological dimension one are colimits of systems of groups of cohomological dimension one. In Part III the deep problem of calculating the cohomological dimension of elementary amenable groups is tackled with particular emphasis on the nilpotent-by-polycyclic case, where a complete answer is obtained over Q for countable group
Ground Truth for Layout Analysis Performance Evaluation
No full textOver the past two decades a significant number of layout analysis (page segmentation and region classification) approaches have been proposed in the literature. Each approach has been devised for and/or evaluated using (usually small) application-specific datasets. While the need for objective performance evaluation of layout analysis algorithms is evident, there does not exist a suitable dataset with ground truth that reflects the realities of everyday documents (widely varying layouts, complex entities, colour, noise etc.). The most significant impediment is the creation of accurate and flexible (in representation) ground truth, a task that is costly and must be carefully designed. This paper discusses the issues related to the design, representation and creation of ground truth in the context of a realistic dataset developed by the authors. The effectiveness of the ground truth discussed in this paper has been successfully shown in its use for two international page segmentation competitions (ICDAR2003 and ICDAR2005)
Mitriostigma greenwayi Bridson 1979
No full text<p> <b>Mitriostigma greenwayi Bridson (1979, p. 127)</b></p> <p> <b>Type:</b> Kenya, Kwale District, Jadini, Greenway 9639 (holotype: K, isotypes: EA, PRE).</p> Distribution <p>Zanzibar -Inhambane regional mosaic: southeast Kenya (Fig. 4).</p> Additional specimens examined Kenya <p>Coast Province: Mwarakaya, Brenan, Gillett, Kanuri and Chamba 14669 (BR, K, WAG); ibid., Luke and Robertson 2628 (EA, K); Kaya forest, Hawthorne 205, 247 (K); Kambe Kaya near Maereni village, Hawthorne 114 (K); Pangani, crossing of Lwandani stream on Chonyi-Ribe road, R. B. Faden, A. J. Faden, Gillett and Gachathi 77/531 (BR, K, MO, WAG); Monbassa, Kaya Diani, De Block, Muasya, Stieperaere and Bytebier 431 (BR, EA, MO); Kilifi District, Ribe Kaya Forest on Chonyi-Ribe road, R. B. Faden, A. J. Faden, Gillett and Gachathi 77/542 (K); Mleji river, Luke 4702 (K); Kaya Kambe, Robertson and Luke 4788 (EA, K); Kaya Diani, Robertson and Luke 5888 (EA, K); ibid., Robertson and Luke 5935 (EA); ibid., W. R. Q. Luke and P. A. Luke 9019 (EA, UPS).</p>Published as part of <i>Sonke´, Bonaventure, Simo, Murielle & Dessein, Steven, 2009, Synopsis of the genus Mitriostigma (Rubiaceae) with a new monocaulous species from south Cameroon, pp. 305-312 in Nordic Journal of Botany 27</i> on page 311, DOI: 10.1111/j.1756-1051.2009.00415.x, <a href="http://zenodo.org/record/5512464">http://zenodo.org/record/5512464</a>
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
2020 Leroy P. Steele Prizes
No full textThe 2020 Leroy P. Steele Prizes were presented at the 126th Annual Meeting of the AMS in Denver, Colorado, in January 2020. The Steele Prize for Mathematical Exposition was awarded to Martin R. Bridson and André Haefliger; the Prize for Seminal Contribution to Research in Analysis/Probability was awarded to Craig Tracy and Harold Widom; and the Prize for Lifetime Achievement was awarded to Karen Uhlenbeck
"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
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