113,929 research outputs found
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
Inquiry into the interlocution of students engaged with mathematics: appreciating links between research and practice
No full textFor either to be useful, links between research and practice are critical. Just as important are connections between the practice of students engaged in mathematical activity and research that seeks to understand that practice. This research report explores lessons that researchers and practitioners can learn from an inquiry into the interlocution of students working collaboratively in small groups when engaged in talking and listening to each other. We use the term interlocution to denote discursive practices of learners in conversational exchanges. Questions that motivate this research included the following. What discursive practices do interlocutors employ as they work collaboratively to understand and resolve mathematical tasks? How do these practices influence the growth of their mathematical ideas? In what ways do their discursive practices help them move from a contextualized, situated task to generalize the task or their solution? Do students' discursive practices assist them to connect and generalize ideas from a new problem to others on which they have worked?Powell, A. B., & Maher, C. A. (2002). Inquiry into the interlocution of students engaged with mathematics: Appreciating links between research and practice. In D.S. Mewborn, P. Sztajn, D.Y. White, H.G. Wiegel, R.L. Bryant & K. Nooney (Eds.), Proceedings of the twenty-fourth annual meeting of the North American Chapter of the International Group for the Psychology of Mathematics Education (Athens, Georgia) (Vol. 1, pp. 317-329). Columbus, OH: ERIC Clearinghouse for Science, Mathematics, and Environmental Education
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
Measurement of the CKM angle gamma from a combination of B->Dh analyses
No full textA combination of three LHCb measurements of the CKM angle gamma is presented. The decays B->DK and B->Dpi are used, where D denotes an admixture of D0 and D0-bar mesons, decaying into K+K-, pi+pi-, K+-pi-+, K+-pi-+pi+-pi-+, KSpi+pi-, or KSK+K- final states. All measurements use a dataset corresponding to 1.0 fb-1 of integrated luminosity. Combining results from B->DK decays alone a best-fit value of gamma = 72.0 deg is found, and confidence intervals are set gamma in [56.4,86.7] deg at 68% CL, gamma in [42.6,99.6] deg at 95% CL. The best-fit value of gamma found from a combination of results from B->Dpi decays alone, is gamma = 18.9 deg, and the confidence intervals gamma in [7.4,99.2] deg or [167.9,176.4] deg at 68% CL, are set, without constraint at 95% CL. The combination of results from B->DK and B->Dpi decays gives a best-fit value of gamma = 72.6 deg and the confidence intervals gamma in [55.4,82.3] deg at 68% CL, gamma in [40.2,92.7] deg at 95% CL are set. All values are expressed modulo 180 deg, and are obtained taking into account the effect of D0-D0bar mixing
Measurement of the ratio of branching fractions B(B0→K∗0γ )/B(B0s→φγ ) and the directCP asymmetry inB 0→K∗0γ
No full textThe ratio of branching fractions of the radiative B decays B0→K⁎0γ and B0s→ϕγ has been measured using an integrated luminosity of 1.0 fb−1 of pp collision data collected by the LHCb experiment at a centre-of-mass energy of s√=7TeV. The value obtained is
B(B0→K⁎0γ)B(B0s→ϕγ)=1.23±0.06(stat.)±0.04(syst.)±0.10(fs/fd),
where the first uncertainty is statistical, the second is the experimental systematic uncertainty and the third is associated with the ratio of fragmentation fractions fs/fd. Using the world average value for B(B0→K⁎0γ), the branching fraction B(B0s→ϕγ) is measured to be (3.5±0.4)×10−5.
The direct CP asymmetry in B0→K⁎0γ decays has also been measured with the same data and found to be
ACP(B0→K⁎0γ)=(0.8±1.7(stat.)±0.9(syst.))%.
Both measurements are the most precise to date and are in agreement with the previous experimental results and theoretical expectations
Tyto pollens Wetmore
No full textTyto pollens Wetmore Bahaman Giant Barn Owl; Lechuza Gigante de Las Bahamas (Fig. 6 D) Tyto pollens Wetmore, 1937: 436 (type-locality “cave deposits on Great Exuma, Bahama Islands” = Little Exuma Island fide Hecht, 1955). Tyto riveroi Arredondo, 1972 b: 131, new synonymy (type-locality “Cueva de Bellamar, poco más de 1 Km. al Sur de la costa interior de la Bahía de Matanzas, Municipio de Matanzas,” Matanzas Province, Cuba). Holotype. Left femur MCZ 2262. Collected by Vivienne Knowles in 1937. Material examined. Hendry Cave, Royal Island, Eleuthera, Bahamas. — Coracoid: incomplete right (USNM 615825). Carpometacarpus: nearly complete right (USNM 615826). Tarsometatarsus: incomplete left (USNM 615827, lacking fragments of midshaft). Banana Hole, New Providence, Bahamas. — Femur: proximal right (UF 41807). Tibiotarsus: distal half of left (UF 41804). Tarsometatarsus: complete left (UF 3196), incomplete left (UF 41808, lacking proximal end and trochlea for digit IV). Cueva de Bellamar, Municipality of Matanzas, Matanzas Province, Cuba. — Tarsometatarsus: distal half of left (DPUH 1252, holotype of T. riveroi), proximal half of right (CZACC unnumbered), proximal end of right (OA 3215). There also exist specimens from Andros, Bahamas, in the Florida Museum of Natural History (D. W. Steadman, pers. comm.). Measurements. See Tables 1–2. Measurements of the three fragmentary tarsometatarsi of T. riveroi are here compared with those of T. pollens from the Bahamas (in parentheses, from Brodkorb 1959: 357, table 2): least width of shaft 8.4, 8.5 (8.6); width through trochleae, 21.5 (21.2); width of shaft at level of distalmost proximal foramen 13.6, 14.4 (13.7), depth through calcaneal ridge 13.9 (13.4). Distribution. Bahamas, islands of the Great Bahama Bank; Cuba, Matanzas Province (see Fig. 1). Remarks. This is the rarest, largest, and most robust of the Antillean barn owls, as well as being the largest representative of the genus Tyto in the New World. The species was originally named from a nearly complete femur (the holotype), an incomplete coracoid, the shaft of a major metacarpal, and the “head” of a tibiotarsus, from cave deposits thought to have come from the island Great Exuma in the Bahamas (Wetmore 1937). It was later determined that the cave was located on Little Exuma (Hecht 1955). The femur was characterized as slightly larger than that of T. ostologa of Hispaniola with the trochanteric ridge larger and more robust (Wetmore 1937: 436). Brodkorb (1959) recorded T. pollens from deposits in Banana Hole, New Providence Island. Additional material from the same site was reported by Olson & Hilgartner (1982), who confirmed its distinction from T. ostologa and T. noeli. New material of T. pollens was collected by an expedition of the Smithsonian Institution in 1990 from Hendry Cave, Royal Island, Eleuthera, Bahamas. This consisted of a coracoid, carpometacarpus, tarsometatarsus, and few pedal phalanges. The owl remains were decidedly scarce in comparison with bones of its principal prey, the Bahaman hutia Geocapromys ingrahami (Allen). The carpometacarpus of T. pollens is much larger and more robust than in any specimen of T. ostologa available suggesting a proportionately larger wing in the former. Otherwise, the new material mentioned above provides evidence of overlap in size between T. pollens and T. ostologa (Table 1–2), but the former can be recognized by its decided robustness and other characters (see Wetmore 1937; Brodkorb 1959; Olson & Hilgartner 1982). It is likely that T. pollens was present on all of the islands of the Great Bahama Bank inhabited by Geocapromys Chapman. There is as yet no evidence of the species from the islands of the Little Bahama Bank, where Geocapromys may not have existed until introduced by Amerindians (see Olson & Hilgartner 1982). Arredondo (1972 b) described a new species, Tyto riveroi, based on the distal half of a tarsometatarsus from a cave deposit in Matanzas Province, Cuba, that was much larger than T. noeli. For reasons discussed below, Arredondo was always under the impression that Tyto noeli, T. ostologa, and T. pollens were all of about the same size, therefore making T. riveroi distinctive by its greater size, which is not correct. We have located additional specimens from Cuba that are referable to T. riveroi. This material (topotypes) includes two proximal ends of right tarsometatarsi lacking articular surfaces (see Material examined), collected by Manuel Rivero de la Calle at the same time and place as the holotype. These fossils had never been mentioned in the literature, even though one of them was included in Arredondo’s paleontological collection. We were able to make direct comparisons of that specimen (OA 3215) with the tarsometatarsus of T. pollens. In size, T. riveroi is similar to T. pollens and there are no other distinctions to be made between them. Therefore we consider Tyto riveroi Arredondo 1972 b, to be a junior subjective synonym of T. pollens Wetmore 1937. Fossils erroneously identified as T. riveroi by Salgado et al. (1992: 28, table 1) from cave deposits in Pinar del Río Province, were based on part of the type material of Bubo osvaldoi. Brodkorb (1959: 357) considered the possibility that Tyto pollens and T. ostologa were possibly differentiated only at the subspecific level but we agree with other authors (Wetmore 1922, 1937; Arredondo 1972 a; Olson & Hilgartner 1984; Steadman & Hilgartner 1999) in considering them distinct at the species level, along with the other taxa recognized here. The rarity of Tyto pollens in Cuba is difficult to understand, although it could possibly be related to the much greater number of other avian predators on that island as opposed to the Bahamas.Published as part of Suárez, William & Olson, Storrs L., 2015, Systematics and distribution of the giant fossil barn owls of the West Indies (Aves: Strigiformes: Tytonidae), pp. 533-553 in Zootaxa 4020 (3) on pages 539-540, DOI: 10.11646/zootaxa.4020.3.7, http://zenodo.org/record/24035
Branching fraction and CP asymmetry of the decays B+→K0Sπ+ and B+→K0SK+
No full textAn analysis of B+ → K0
Sπ+ and B+ → K0
S K+ decays is performed with the LHCb experiment. The pp
collision data used correspond to integrated luminosities of 1 fb−1 and 2 fb−1 collected at centre-ofmass
energies of
√
s = 7 TeV and
√
s = 8 TeV, respectively. The ratio of branching fractions and the
direct CP asymmetries are measured to be B(B+ → K0
S K+
)/B(B+ → K0
Sπ+
) = 0.064 ± 0.009 (stat.) ±
0.004 (syst.), ACP(B+ → K0
Sπ+
) = −0.022 ± 0.025 (stat.) ± 0.010 (syst.) and ACP(B+ → K0
S K+
) =
−0.21 ± 0.14 (stat.) ± 0.01 (syst.). The data sample taken at
√
s = 7 TeV is used to search for
B+
c
→ K0
S K+ decays and results in the upper limit ( fc · B(B+
c
→ K0
S K+
))/( fu · B(B+ → K0
Sπ+
)) <
5.8 × 10−2 at 90% confidence level, where fc and fu denote the hadronisation fractions of a ¯b
quark
into a B+
c or a B+ meson, respectively
Pragmatic Case Studies as a Source of Unity in Applied Psychology
No full textTo unify or not to unify applied psychology: that is the question. In this article we review pendulum swings in the historical efforts to answer this question—from a comprehensive, positivist, “top-down,” deductive yes between the 1930s and the early 60s, to a postmodern no since then. A rationale and proposal for a limited, “bottom-up,” inductive yes in applied psychology is then presented, employing a case-based paradigm that integrates both positivist and postmodern themes and components. This paradigm is labeled “pragmatic psychology” and, its specific use of case studies, the “Pragmatic Case Study Method” (“PCS Method”). We call for the creation of peer-reviewed journal-databases of pragmatic case studies as a foundational source of unifying applied knowledge in our discipline. As one example, the potential of the PCS Method for unifying different angles of theoretical regard is illustrated in an area of applied psychology, psychotherapy, via the case of Mrs. B. The article then turns to the broader historical and epistemological arguments for the unifying nature of the PCS Method in both applied and basic psychology.Peer reviewe
Large-Scale Circulation Reversals in a 2D Rayleigh-Bénard cell
No full textWe consider the numerical simulation of a two-dimensional Rayleigh-B\'enard cell in the turbulent regime and . The flow is dominated by a large-scale inclined roll, the orientation of which switches intermittently in time. We use Proper Orthogonal Decomposition to identify the most energetic modes. We find that the first two modes respectively correspond to an antisymmetric and a symmetric mode. The next most energetic mode breaks the symmetry of the flow. During reversals, sharp variations in the temporal amplitudes of the modes are observed. We derive a low-dimensional model based on the first three most energetic modes which is able to reproduce the large-scale circulation reversals, in quantitative agreement with the simulation
Supplemental Material, sj-docx-1-cpt-10.1177_10742484221142220 - Prescribing Patterns of Direct-Acting Oral Anticoagulants in Patients With Atrial Fibrillation and Chronic Kidney Disease: A Retrospective Cohort Analysis
No full textSupplemental Material, sj-docx-1-cpt-10.1177_10742484221142220 for Prescribing Patterns of Direct-Acting Oral Anticoagulants in Patients With Atrial Fibrillation and Chronic Kidney Disease: A Retrospective Cohort Analysis by Jorge L. Reyes, Charles A. Herzog, Heng Yan, Nicholas S. Roetker and James B. Wetmore in Journal of Cardiovascular Pharmacology and Therapeutics</p
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