124,650 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
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
Cycloaddition reactions of phenylglyoxal imines to enol ethers. New approach to the synthesis of benz[b]acridine-6,11-dione derivatives
No full textThe crystal structure of p-fluorobenzyltriphenyltin(IV)
No full textThe title compound C25H21FSn crystallizes in the orthorhombic system, space group Pbca, with a = 20.172 (2) Angstrom, b = 26.732 (2) Angstrom, c = 7.766 (1) Angstrom, Z = 8. The molecular structure shows an almost undistorted tetrahedral coordination about Sn and a propeller-like conformation of the SnPh(3) group, the conformation of the para-substituted benzyl moiety is strongly controlled by the configuration of the SnPh(3) group. Physical properties of C25H21FSn are explained in terms of structural data. The crystal structure has been refined to R = 0.024 for 2435 observed reflection
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
Peripartum hysterectomy and cesarean delivery: a population-based study.
No full textOBJECTIVE: To estimate the incidence of peripartum hysterectomy in an Italian Region (Emilia-Romagna) and investigate its association with cesarean delivery. DESIGN: Population-based retrospective study using hospital discharge records. SETTING: All public and private hospitals in Emilia-Romagna region, Italy. POPULATION: A total of 151,494 women delivering between 2003 and 2006, 131 of whom had a peripartum hysterectomy. METHODS: Peripartum hysterectomy was defined as a hysterectomy performed at the time of delivery or afterwards during the same hospitalization. Incidence rates were calculated by type of delivery. Odds ratios (ORs) with 95% confidence intervals (CIs) were estimated with logistic regression to evaluate the association between peripartum hysterectomy and delivery type. MAIN OUTCOME MEASURES: Incidence rates of peripartum hysterectomy by type of delivery; odds of peripartum hysterectomy after primary or repeat cesarean compared with vaginal delivery without previous cesarean. RESULTS: A total of 131 peripartum hysterectomies were performed among 151,494 deliveries (0.86/1,000 deliveries; 95% CI 0.72-1.03) with 20.7% primary and 9.6% repeat cesarean deliveries. Women undergoing a primary caesarean delivery were more likely to have a peripartum hysterectomy than women having a vaginal delivery who had never had a cesarean delivery (OR 6.48; 95% CI 4.16-10.07). Women undergoing a repeat caesarean delivery were also at increased risk (OR 3.69; 95% CI 2.11-6.46). CONCLUSIONS: In this population, primary and repeat cesarean deliveries are associated with an increased risk of peripartum hysterectomy. These results are of particular concern given the steady increase in the cesarean delivery rate in many countries. The pathological mechanism of this association requires further investigation
Desenvolvimento de uma biblioteca para sistemas de visão estereoscópia para robótica móvel
No full textDissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-Graduação em Engenharia Elétrica.A demanda por aplicações de robótica móvel vem crescendo consideravelmente nos últimos anos. Independente da natureza ou fim, robôs autônomos móveis devem interagir com o mundo para alcançar seus objetivos. Para isto, de alguma maneira precisam obter informações a respeito do ambiente. Dentre diferentes abordagens existentes, bons resultados têm sido alcançados pelo emprego de sistemas de visão estereoscópica. Através de um sistema como este é possível extrair informação tridimensional do meio em que o robô está inserido. A informação tridimensional pode então ser usada para orientar as ações do robô, seja para navegação, reconhecimento ou manipulação. No presente trabalho é apresentado o desenvolvimento de uma biblioteca para sistemas de visão estereoscópica para robótica móvel. Para tal, foram tratados diferentes problemas da estereoscopia, procurando prover mapas de profundidade com detalhes do ambiente suficientes para a operação geral de um robô móvel que tenha um sistema de visão estereoscópica como principal fonte de informação. Neste contexto, são avaliados e propostos modelos, métodos e soluções para diferentes problemas como calibração de câmeras, retificação de imagens, reconstrução e, principalmente, geração de mapas de profundidade densos. Os resultados obtidos demonstram a efetividade da utilização da infra-estrutura disponibilizada e dos métodos propostos no desenvolvimento de aplicações para robótica móvel
Dr. Edwin Wright Collection: Author Unknown
No full textNotes - The author relates several short stories about his neighbours including Alex McDonell, homesteading and life around Meanook and Athabasca (1 page
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
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