1,721,048 research outputs found
Dynamical Features of the Meteorite Ice Field, Antarctica
Full text linkP(論文)Results of the glaciological work made in 1969 and 1973-1974 near the Yamato Mountains showed that the dynamical features of the southern Meteorite Ice Field (bare ice) were quite different from those of the ice sheet in the Shirase drainage, East Antarctica. In the ice field, ice flowed toward the Yamato Mountains with the small horizontal velocity less than 2m/year; the vertical movement of ice indicated the emergence velocity of 5cm/year on the average, and the mean ablation rate amounted to 5cm/year in water equivalent. Discussions were also made whether or not the hypothetical idea of the concentration of meteorites within a limited area is possible, in terms of a mass budget study in the present drainage system. The result revealed that, if a number of meteorites had once fallen uniformly over the hinterland of the drainages of the Shirase Glacier and of the Meteorite Ice Field, more than 95% of the meteorites were drained off through the coast of the ice sheet, and only a few percent of them were conveyed to and exposed on the bare ice field around the Yamato Mountains.departmental bulletin pape
Surface Heat Balance and Spatially Distributed Ablation Modelling at Koryto Glacier, Kamchatka Peninsula, Russia
Full text linkTo investigate the characteristics of ablation at Koryto Glacier, a mountain glacier under maritime climate in Kamchatka Peninsula, Russia, we made field observations from August to early September 2000. At a site near the equilibrium line, the 31-day average net radiation, sensible heat flux, and latent heat flux were 43, 59 and 31 W-2, respectively. We developed a new distributed ablation model, which only needs measurements of air temperature and global radiation at one site. Hourly ablation rates at this site obtained by the energy balance method are related to measured air temperature and global radiation by linear multiple regression. A different set of multiple regression coefficients is fitted for snow and ice surfaces. Better estimates of ablation rate can be obtained by this approach than by other temperature index models. These equations are then applied to each grid cell of a digital elevation model to estimate spatially distributed hourly melt. Air temperature is extrapolated using a constant temperature lapse rate and global radiation is distributed considering topographic effects. The model enables us to calculate the hourly spatial distribution of ablation rates within the glacier area and could well provide a realistic simulation of ablation over the whole glacier
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
III. MOVEMENT OF THE ICE SHEET OBSERVED BY A TRIANGULATION CHAIN
Full text linkP(論文)departmental bulletin pape
XI. DENSITY AND HARDNESS OF SNOW IN MIZUHO PLATEAU IN 1969-1970
Full text linkP(論文)departmental bulletin pape
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