1,723,099 research outputs found
Agriculture in the Palouse: a portrait of diversity
No full textBulletin no. 794 Moscow, Idaho :University of Idaho, College of Agriculture, Cooperative Extension System, 1999-02-01. Author(s): Hall, Mike; Young, Douglas L.; Walker, David J
Le développement industriel planifié : Walker (David F.), Planning Industrial Development
No full textDezert Bernard. Le développement industriel planifié : Walker (David F.), Planning Industrial Development. In: Annales de Géographie, t. 93, n°518, 1984. pp. 498-502
Table ronde « Croisements : langue, culture, théorie »
No full textO'Donovan Patrick, H. Walker David, Holmes Diana. Table ronde « Croisements : langue, culture, théorie ». In: Cahiers de l'Association internationale des études francaises, 2005, n°57. pp. 341-354
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe 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
Biofouling and its control for in situ lab-on-a-chip marine environmental sensors
No full textBiofouling is the process by which biological organisms attach to surfaces in an aqueous environment. This occurs on nearly all surfaces in all natural aquatic environments, and can cause problems with the functioning of scientific equipment exposed to the marine environment for extended periods. At the National Oceanographic Centre in Southampton (NOCS), the Centre for Marine Microsystems (CMM) is developing lab-on-chip micro-sensors to monitor the chemical and biological environment in situ in the oceans. Due to the long periods (up to several months) that these sensors will be deployed, biofouling by microbial biofilms is an important concern for the efficient running of these sensors. The aim of this project was therefore to determine the potential level of fouling within the sensors and to investigate the potential use of low-concentration diffusible molecules (LCDMs) to remediate biofouling.Many of the sensors in development by CMM are designed to sense specific chemical species and they use various chemical reagents to achieve this. The effects of some of these reagents on the formation of biofilms by mixed marine communities were investigated. It was shown that Griess reagent and ortho-phthadialdehyde (OPA), used to sense nitrites and ammonium respectively, effectively stop biofilm formation by killing microorganisms before they can attach to surfaces.Biofouling on two different polymers, cyclic olefin copolymer (COC) and poly (methyl methacrylate) (PMMA), used in the construction of micro-sensors, was compared with biofouling on glass. No differences were observed between COC and PMMA, however a small but significant difference in surface coverage was observed between glass and COC at the early stages of exposure to the marine environment. The lack of differences between the two polymers suggests that biofouling is not an important consideration when deciding whether to construct sensors from COC or PMMA. However, the larger degree of fouling on hydrophobic COC compared with hydrophilic glass indicates a potential use of surface modifications as an antifouling strategy.The effects on biofouling of the LCDMs nitric oxide (NO), cis-2-decenoic acid (CDA) and patulin, were investigated to evaluate their potential for anti-fouling in marine micro sensors. All three molecules were shown to reduce the formation of biofilms by mixed marine communities, but colony counts suggested that the effect of patulin was due to toxicity as opposed to a physiological effect. Investigation of biofilm growth in the light and the dark revealed that there was less biofilm formation in the light that the dark and this effect was determined to be due to an interaction with the polystyrene growth substratum.Analysis of the biofilm communities grown in the presence of LCDMs by denaturing gradient gel electrophoresis (DGGE), showed no clear differences in community profiles depending on the LCDMs. However those biofilms grown in the light appeared to have a greater proportion of Alphaproteobacteria than those grown in the dark.Further study is needed to determine the level of fouling and the applicability of LCDMs in real micro-sensor systems. However, this study has shown that LCDMs have the potential to remediate, at least in part, the biofouling of marine micro-sensors
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe 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
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe 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
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