1,720,962 research outputs found
An Investigation on Super- and Sub-Terminal Drops in Two Different Rain Categories and Climate Regimes
Full text linkThe pressing need for accurate and reliable precipitation measurements and forecasting poses theoretical and technological problems. Remote-sensing instruments with increased coverage and sensitivity (such as space-borne and ground-based radar) are available; however, their full exploitation requires physical calibration and validation based on a deep knowledge of precipitation microphysics. This study reports a detailed analysis of the evidence of non-terminal velocities in a mid-latitude (Bologna, Italy) and a tropical location (Kolkata, India). The data from two identical disdrometers OTT-Parsivel2 were analyzed to shed light on the nature of the raindrops that fall at a velocity that is significantly higher (i.e., super-terminal drops) or lower (sub-terminal drops) than the terminal velocity expected for the raindrop sizes. The results show a significant fraction of super- and sub-terminal drops in both locations. The percentages of both super- and sub-terminal drops were higher in Kolkata. However, the difference was more notable for convective rain. The percentages of both super- and sub-terminal drops were found to be high within a drop diameter of 1 mm. The number of sub-terminal drops seemed to increase with an increase in diameter for drops larger than ~2.5 mm. The natural rain in Bologna showed stronger evidence of drop break-up in correspondence with the evolution of non-terminal velocities. Moreover, this study once again pointed toward the fact that the process of break-up cannot be neglected in natural rain of tropical or mid-latitude locations. We found that 7% and 10% of rain samples in Bologna and Kolkata seemed to be subjected to drop break-up. The results indicate that radar measurements of rain in the tropics or mid-latitude regions, relying on the Gunn–Kinzer relationship between velocity and diameter, should be verified by observations of disdrometers for a high precision QPE
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
Translational Departures: Rethinking Genre and Transl ation
Full text linkThe present paper attempts to read certain episodes in nineteenth century colonial Calcutta as processes of cultural translation. The translational aspect of the colonial encounter has been largely unnoticed. The cul rural traffic, the movement of languages, books, genres and ideas indicate a larger process of cultural translation at work. In rethinking how cultures relate to one another at moments of cultural encounter, I have tried co emphasize the crucial role chat genres play in such a process. Through a select reading of the novel and some popular prinr genres in nineteenth cenrury Calcurt.a I suggest that instead of a stable mimetic theory of art we need to approach the colonial encounter as a process of constant negotiation and exchange, of translational departures which in rum helps us unsercle conventional notions of the rigidity of genre boundaries enabling a furthering of processes of translation. The present paper attempts to read certain episodes in nineteenth century colonial Calcutta as processes of cultural translation. The translational aspect of the colonial encounter has been largely unnoticed. The cul rural traffic, the movement of languages, books, genres and ideas indicate a larger process of cultural translation at work. In rethinking how cultures relate to one another at moments of cultural encounter, I have tried co emphasize the crucial role chat genres play in such a process. Through a select reading of the novel and some popular prinr genres in nineteenth cenrury Calcurt.a I suggest that instead of a stable mimetic theory of art we need to approach the colonial encounter as a process of constant negotiation and exchange, of translational departures which in rum helps us unsercle conventional notions of the rigidity of genre boundaries enabling a furthering of processes of translation. 
Mechanistic Investigations of a Series of Porphyrin Metal (III) Catalysts with Al, Cr or Co Centers for the Synthesis of Polyethers, Polycarbonates and Polyesters
No full textDispelling 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
The Synthesis of Biodegradable Polycarbonates and Polyesters from Renewable Resources Using Highly Active (Porphyrin)Cr(III) Chloride Catalysts
Full text linkMathematical and Physical Sciences: 3rd Place (The Ohio State University Edward F. Hayes Graduate Research Forum)A series of porphyrin metal(III) compounds of general formula LMX (where L = tetraphenylporphyrin, tetrakispentafluorophenylporphyrin and octaethylporphyrin, M = Al, Cr, Co, and X = Cl- and OEt) has been synthesized and studied as catalysts for the ring opening polymerization of propylene oxide (PO) as well as copolymerization of PO with CO2 to produce polypropylene oxide (PPO), polypropylene carbonate (PPC) and propylene carbonate (PC), respectively. The electronic nature of the porphyrin ligand and the addition of Lewis basic cocatalysts e.g. DMAP and PPN+Cl- showed a dramatic influence on the catalytic TOF, product selectivity and polymeric microstructure. The origin of these effects was attributed to the electronic factors associated with the individual reaction steps and equilibriums.A three-year embargo was granted for this item
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