125,631 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
Erratum: “Setup for meV-resolution inelastic X-ray scattering measurements and X-ray diffraction at the Matter in Extreme Conditions endstation at the Linac Coherent Light Source” (Review Of Scientific Instruments (2018) 89 (10F104) DOI: 10.1063/1.5039329)
No full textIn the original paper1 the co-author E. J. Gamboa was erroneously omitted. The corrected author list is identical to that of this erratum, and repeated below for clarity: E. E. McBride,1,2,a) T. G. White,3 A. Descamps,1,4 L. B. Fletcher,1 K. Appel,2 F. Condamine,5,6 C. B. Curry,1,7 F. Dallari,8 S. Funk,9 E. Galtier,1 E. J. Gamboa,1 M. Gauthier,1 S. Goede,2 J. B. Kim,1 H. J. Lee,1 B. K. Ofori-Okai,1,10 M. Oliver,11 A. Rigby,11 C. Schoenwaelder,1,9, P. Sun,1 Th. Tschentscher,2 B. B. L. Witte,1,12 U. Zastrau,2 G. Gregori,11 B. Nagler,1 J. Hastings,1 S. H. Glenzer,1 and G. Monaco8 1 SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA 2 European XFEL GmbH, Holzkoppel 4, D-22869 Schenefeld, Germany 3 University of Nevada at Reno, Reno, Nevada 89506, USA 4 Department of Aeronautics and Astronautics, Stanford University, Stanford, California 94305, USA 5 Sorbonne Universits, UPMC, LULI, UMR 7605, Case 128, 4 Place Jussieu, 75252 Paris Cedex 05, France 6 LULI, Ecole Polytechnique, CEA-CNRS-UPS, 91228 Palaiseau, France 7 Department of Electrical and Computer Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada 8 Dipartimento di Fisica, Universit`a di Trento, via Sommarive 14, 38123 Povo, TN, Italy 9 Friedrich-Alexander-Universitat Erlangen-N ̈urnberg, Erlangen Centre for Astroparticle Physics, Erwin-Rommel-Str. 1, D-91058 Erlangen, Germany 10 Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA 11 Department of Physics, Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom 12 Universit ̈at Rostock, Institut f ̈ur Physik, D-18051 Rostock, Germany
Breeding of Brassica rapa for Biogas Production: Heterosis and Combining Ability of Biomass Yield
No full textThe use of plant biomass as substrate for biogas production has recently become of major interest in Europe. Winter Brassica rapa produces high early biomass and could be grown as a pre-crop harvested early in the year followed by a second crop such as maize. The objectives of this study were to estimate heterosis and combining ability of 15 European winter B. rapa cultivars for biomass yield at end of flowering. A half-diallel without reciprocals was conducted among cultivars to produce 105 crosses. These crosses and their parents were evaluated in two years at two locations in Northern Germany. Data collected were days to flowering (DTF), fresh biomass yield (FBY), dry matter content (DMC) and dry biomass yield (DBY). The mean DBY was 5.3 t/ha for the parental cultivars and 5.6 t/ha for their crosses. The crosses surpassed on average their parents by 7.6% for FBY and 5.9% for DBY whereas DMC was 1.4% higher in the parents. Maximum mid parent heterosis was 21.0% for FBY and 30.4% for DBY. Analysis of variance showed that genetic variance was mainly due to specific combining ability (SCA). The correlation between parental performance and general combining ability (GCA) was 0.42 for FBY and 0.53 for DBY. In conclusion, the amount of heterosis in crosses between European winter B. rapa cultivars is not very high on average, but can be up to 30% in the best crosses. Selection of parental combinations with high specific combining ability to produce synthetic cultivars can rapidly improve biomass yield.KWS Saat AG, Einbeck; FNR (Agency for Renewable Resources) German
Valuing project risk and flexibility in mining resource development
No full textThesis (S.M.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering; and, (S.M.)--Massachusetts Institute of Technology, Sloan School of Management, Technology and Policy Program, 1999.Includes bibliographical references (leaves 63-65).by Kojo S. Ofori-Atta.S.M
Biomass yield and heterosis of crosses within and between European winter cultivars of turnip rape (Brassica rapa
No full textBecause of its high growth rate at low temperatures in early spring, there is renewed interest in Brassica rapa as a winter crop for biomass production in Europe. The available cultivars are not developed for this purpose however. An approach for breeding bioenergy cultivars of B. rapa could be to establish populations from two or more different cultivars with high combining ability. The objective of this study was to evaluate the heterosis for biomass yield in the European winter B. rapa genepool. The genetic variation and heterosis of the biomass parameters: dry matter content, fresh and dry biomass yields were investigated in three cultivars representing different eras of breeding by comparing full-sibs-within and full-sibs-between the cultivars. Field trials were performed at two locations in Germany in 2005-2006. Mean mid-parent heterosis was low with 2.5% in fresh and 3.0% in dry biomass yield in full-sibs-between cultivars. Mean values of individual crosses revealed a higher variation in mid-parent heterosis ranging from 14.6% to -7.5% in fresh biomass yield and from 19.7% to -12.7% in dry biomass yield. The low heterosis observed in hybrids between European winter cultivars can be explained by the low genetic variation between these cultivars as shown earlier with molecular markers. In conclusion, a B. rapa breeding program for biomass production in Europe should not only use European genetic resources, but should also utilize the much wider worldwide variation in this species.FNR (Agency for Renewable Resources
Human resource development in construction
No full textThe construction industry has demonstrated unique and complex linkages to other sectors of a nation’s economy. It can generate employment and has the potential to generate income in the location of the construction project and thus alleviate poverty (Ofori, 2002). The industry goes beyond the provision of shelter and infrastructure and provides human and local material resources for the development and maintenance of buildings, housing and physical infrastructure. The attraction of foreign direct investment (FDI) is intrinsically linked to infrastructure development. As most developing countries clamour for FDI, rapid infrastructure development has become prevalent, but most of these countries lack the requisite complement of professional and technical expertise and skills required to construct modern and complex infrastructure. Given this, huge and complex infrastructural projects in developing countries are predominantly handled by foreign firms with minimum or no involvement of local professionals. This adversely affects the development of local capacity for the construction and maintenance of such infrastructure, with consequent inability of local professionals to adequately maintain or repair such infrastructure
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
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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