1,720,967 research outputs found
Some aspects of the convective boundary layer over the Bay of Bengal
Full text linkA study has been carried out to investigate the thermodynamic characteristics of the Convective Boundary Layer (CBL) over the Bay of Bengal region. For this purpose aerological observations collected from MONSOON-77 utilizing the erstwhile USSR research vessels (i. e. Shirshov, Priboy, Shokalsky and Okean) in the region 15-19°N, 87-91°E during 11 - 18 August 1977 and BOBMEX-98 onboard Sagar Kanya at 13°N 87°E have been considered. The results of the analysis showed that no marked differences are found in the Convective Boundary Layer characteristics over the four ships during the period under consideration. 6-hourly vertical profiles of the thermodynamical paramenters showed the evolution of the CBL structure during daytime at all the locations. The top of the CBL is found between 700-580 hPa and it varied with time. The daily 6-hourly values of surface meteorological parameters viz, p, T and Td showed diurnal variation. Also, it is evident that the surface meteorological parameters as well as structure of the CBL over the region mentioned above is influenced by the prevailing weather conditions and associated synoptic/transient scale disturbances
Thermodynamic structure of the marine atmosphere over the region 80-87°E along 13°N during August (phase II) BOBMEX-99
Full text linkThermodynamic structure of the marine atmosphere in the region between 80 and 87°E along 13°N over the Bay of Bengal was studied using 13 high resolution radiosonde profiles from surface -400 hPa collected onboard ORV Sagar Kanya during the period 27th-30th August, during BOBMEX-99. Saturation point concept, mixing line analysis and conserved variable diagrams have been used to identify boundary layer characteristics such as air mass movement and stability of the atmosphere. The results showed relatively dry air near the ocean surface between 1000 and 950 hPa. This feature is confirmed by the conserved structure in this layer. Further, seldom showed any inversions in this region. The profiles showed persistent low cloud layers between 900 and 700 hPa. The conserved variable diagrams (c-q) showed the existence of double mixing line structures approximately at 950 and 700 hPa levels
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
The Convective Boundary Layer over the Deccan Plateau, India during the summer monsoon
No full textThe thermodynamic structure of the Convective Boundary Layer (CBL) over the Deccan Plateau, India has been investigated using aerological data during the summer monsoon seasons of 1980 and 1981. Conserved-variable analysis and the saturation-point approach, which were used in this study, suggest that the top of the CBL varied between 700-600 mb during the monsoon. The air above the top of the CBL during a weak monsoon was estimated to have subsided for 4 days with a subsidence rate of 30 mb day-1
Mixing processes in the atmospheric boundary layer during the summer monsoon
No full textThe saturation point concept and mixing line approach have been used in this study. During break conditions of monsoon the mixing line was cooler than the atmospheric stratification and suggested that mixing of cloud base air and inversion top air would produce downdrafts to the base of inversion. During the active conditions of monsoon the mixing line was warmer than the environmental stratification, indicating that the mixing of environmental air and cloud base air may produce warmer updrafts
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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