1,720,979 research outputs found
The Behavior of the Nitrogen Diox-ide, Total Peroxy Nitrates, and Total Alkyl Nitrates in the Borneo Forest During 2008 OP3 cam-paign
No full textThe production of secondary organic aerosols due to the oxidation of biogenic volatile organic compounds, is controlled by NOx and its reservoir concentrations. The mixing ratios of NO2, RO2NO2 and RONO2 were measured as part of the multi-investigator study, OP3, which took place in the Borneo forest (Malaysia) in July 2008. Ten hertz NO2 measurements allow to use the eddy covariance technique to determine NO2 fluxes. NO2, RO2NO2 and RONO2 show diurnal behavior with very low concentration (NO2 below 1 ppbv for almost all the campaign), although it is greater during nights than during days. The implications of these observations and their impact on secondary aerosols production will be discussed
Observations of Nitrogen Dioxide, Total Peroxy Nitrates and Total Alkyl Nitrates in the Borneo Forest During 2008 OP3 campaign
No full textThe production of ozone is controlled by NOx and its reservoir concentrations. Here will be described a new instrument to measure NO2 directly and selectively and RO2NO2 and RONO2 after thermal dissociation into NO2. This instrument has been used during the multi-investigator study, OP3, which took place in the Borneo forest (Malaysia) in July 2008. The concentrations of NO2 were very low (less 1 ppbv) as well as ozone (less than 20 ppbv). The implications of NO2, RO2NO2 and RONO2 observations on the ozone production in a clean remote environment will be discussed
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
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
Observations of NOx, peroxy nitrate and alkyl nitrate during OP3 campaign in the Borneo rain forest: diurnal cycles and the role in ozone production
No full textPeroxy nitrate (∑PNs) and alkyl nitrate (∑ANs ) are the main reservoirs of NOx and their measurement can accurately determine the chemical processes that regulate the concentrations of NOx and then ozone. Previous observations in environments dominated by biogenic emissions have shown that alkyl nitrate is a significant fraction of the NOy. This presentation discusses the observations during the OP3 campaign made in the forest of Borneo in Malaysia in order to study the role of alkyl nitrate and peroxy nitrate in the NOy budget and how they influence the formation of ozone at low concentrations of NOx and anthropogenic VOC but at high levels of biogenic VOC
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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