177,389 research outputs found
Notes sur les coutumes des marka de Lanfiéra
No full textSanogo Moussa, Pageard R. Notes sur les coutumes des marka de Lanfiéra . In: Journal de la Société des Africanistes, 1964, tome 34, fascicule 2. pp. 306-310
Date of extreme precipitating events over Burkina Faso
No full textThe present ASCII file provides the dates of the daily extreme precipitating events (EPEs) for each of the 15 1°x1° pixels covering Burkina Faso as detected by Sanogo et al. (2022). The original raingauge dataset was provided by the Burkinabe National Meteorological Agency (Agence Nationale de la Météorologie). It consists in 142 raingauge stations covering most of Burkina Faso and providing daily rainfall accumulation over the period 1995–2016. Raingauge data were aggregated in 1°x1° pixels, and only pixels with at least five stations were considered. EPEs are detected for each of these pixels as the days when rainfall exceeds the 99th all-day percentile computed over the 1995-2016 period (Note Sanogo et al. 2022 used the period 2001-2013 for consistency with other datasets). See Sanogo et al. 2022 for details.
The present dates serve as a basis for the composite analysis in Peyrillé et al. (2023).
The ASCII file is organised as follows: one line per event, with latitude (degrees north), longitude (degrees east), year, month and day separated by spaces. Latitude and longitude refer to the center of each 1°x1° pixel.
Peyrillé, P., R. Roehrig, and S. Sanogo, 2023: Tropical Waves are key drivers of Extreme Precipitation Events in the Central Sahel. Submitted to Geophysical Research Letters.
Sanogo, S., P. Peyrilé, R. Roehrig, F. Guichard, F., and O. Ouedraogo, 2022: Extreme precipitating events in satellite and rain gauge products over the Sahel. Journal of Climate, 35(6), 1915– 1938. https://doi.org/10.1175/JCLI-D-21-0390.
ESSENTIAL OIL FROM AERIAL PARTS OF VERNONIA COLORATA DRAKE AND VERNONIA NIGRITIANA OLIVER ET HIERN. (ASTERACEAE) GROWING WILD IN MALI.
No full textOleanane Saponins from Stylosanthes erecta.
No full textFive new oleanane saponins (1-5) together with 4 know flavonol glycosides were isolated from the aerial parts of S. erecta. Their structures were elucidated by 1D and 2D NMR expts. including 1D-TOCSY, DQF-COSY, ROESY, HSQC, and HMBC spectroscopy, as well as ESI-MS anal. The aglycon moieties of 1-4 were assigned as new oleanane derivs
Androstanes and pregnanes from Trichilia emetica ssp. suberosa J.J. de Wilde
No full textFour pregnanes: 1-methoxy-pregnan-17(R)-1,4-dien-3,16-dione (1), 1-methoxy-pregnan-17(S)-1,4-dien-3,16-dione (2), 2,3-seco-pregnan-17(S)-2,3-dioic acid-16-oxo-dimethyl ester (4), 2α,3α,16α-trihydroxy-5α-pregnan-17(R)-20-yl acetate (7), three androstanes: 1-methoxy-androstan-1,4-dien-3,16-dione (3), 2,3-seco-androstan-2,3-dioic acid-16-oxo-dimethyl ester (5), 3-methoxycarbonyl-2,3-seco-androstan-3-oic acid-16-oxo-2,19-lactone (6), together with three known pregnane derivatives, were isolated from the roots of Trichilia emetica ssp. suberosa. Their structures were determined by means of 1D and 2D NMR spectroscopy, mass spectrometry analysis, as well as by quantum chemical calculations
[Analyses de] - R. Bedaux, J. Polet, K. Sanogo & A. Schmidt (éds), Recherches archéologique à Dia dans le Delta intérieur du Niger (Mali) : bilan des saisons de fouilles 1998-2003. Mededelingen van het Rijksmuseum voor Volkenkunde, Leiden
No full textSahara 19 (revue internationale consacrée à la préhistoire et à l'histoire du Sahara)Compte rendu du livre de R. Bedaux, J. Polet, K. Sanogo & A. Schmidt (éds), Recherches archéologique à Dia dans le Delta intérieur du Niger (Mali) : bilan des saisons de fouilles 1998-2003, 200
[Analyses de] - R. Bedaux, J. Polet, K. Sanogo & A. Schmidt (éds), Recherches archéologique à Dia dans le Delta intérieur du Niger (Mali) : bilan des saisons de fouilles 1998-2003. Mededelingen van het Rijksmuseum voor Volkenkunde, Leiden
No full textSahara 19 (revue internationale consacrée à la préhistoire et à l'histoire du Sahara)Compte rendu du livre de R. Bedaux, J. Polet, K. Sanogo & A. Schmidt (éds), Recherches archéologique à Dia dans le Delta intérieur du Niger (Mali) : bilan des saisons de fouilles 1998-2003, 200
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe 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
"Closing the R&D Gap, Evaluating the Sources of R&D Spending"
No full textBoth spending and tax policies have been implemented in the United States with the goal of stimulating private sector research and development (R&D). Karier questions whether current R&D policy, especially the research and experimentation tax credit, can contribute to closing the gap between nondefense expenditures on R&D in the United States and such expenditures in other countries, such as Japan and Germany. He also explores possible changes to our current R&D policy to make it more effective.
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
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