16,214 research outputs found
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Fitzroya Cupressoides Yields 1534-Year Long South American Chronology
No full textThe longest tree-ring chronologies for the Southern Hemisphere published to date go back to A.D. 1011 in central Chile; 1028 in Tasmania, Australia; 1140 in western Argentina; and 1256 on the North Island, New Zealand. For paleoclimatic and other studies longer time series would be very desirable. Here we report on the first successful crossdating and chronology development for Fitzroya cupressoides, a redwood-like conifer in western Argentina, which goes back to 441 and exhibits desirable statistical characteristics.This item is part of the Tree-Ring Research (formerly Tree-Ring Bulletin) archive. It was digitized from a physical copy provided by the Laboratory of Tree-Ring research at The University of Arizona. For more information about this peer-reviewed scholarly journal, please email the Editor of Tree-Ring Research at [email protected]
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Cedrela Angustifolia and Juglans Australis: Two New Tropical Species Useful in Dendrochronology
No full textDendrochronological problems in dating tropical tree species are responsible for a large gap in global dendroclimatic reconstructions. Study of Cedrela and Juglans in the low-latitude forests of northern Argentina and Bolivia has resulted in development of four chronologies. These genera have good tree-ring characteristics, and statistics indicate that they have good potential for dendroclimatology. Longer series should be obtained from older stands.This item is part of the Tree-Ring Research (formerly Tree-Ring Bulletin) archive. It was digitized from a physical copy provided by the Laboratory of Tree-Ring research at The University of Arizona. For more information about this peer-reviewed scholarly journal, please email the Editor of Tree-Ring Research at [email protected]
Making Explosive Cocktails: recipes and costs for 26 Crises from 1823 to 2003
Get PDFCrises, like “explosive cocktails” are made by mixing powerful ingredients. Argentina has made 26 “explosive cocktails” since 1823. How many ingredients are needed to make an “explosive cocktail”? Which are these ingredients? Which is the most expensive mix? This paper attempts to identify the different recipes that ended up in economic crisis throughout argentine economic history by means of the regression tree analysis technique. The paper also measures Argentina’s crises costs in terms output losses. We follow the methodology used by the IMF (1998), that is, computing cumulative output lost relative to trend. It is found that there are four explosive mixes, having Fiscal Deficit, Real Exchange Rate Overvaluation, Bank Deposit growth rate decline and the ratio of External Debt to Exports as the key ingredients. The most frequent crises are those having high fiscal deficit; though average cost is higher for crises mixing moderate fiscal with strong decline in Real Bank Deposits, presumably entailing banking crises.Currency Crises, Regression Tree Analysis, Crises Costs
The first network of tree-ring chronologies for co-occurring Nothofagus nervosa and Nothofagus obliqua along a precipitation gradient in Patagonia, Argentina
No full textWe present the first network of tree-ring chronologies for co-occurring Nothofagus nervosa and Nothofagus obliqua in Argentina. Using standard dendrochronological techniques, we developed seven tree-ring width chronologies for each species, encompassing their E-W distribution along a precipitation gradient. Chronology statistics indicated that N. nervosa and N. obliqua are strong candidates for research in dendrochronology. The chronologies were used to study and compare the temporal and spatial growth patterns of each species. Correlation and principal components analysis of the tree-ring chronologies serve as evidence of a strong common signal, indicating shared regional growth patterns across the gradient with some exceptions between sites and species. These results indicate the high potential of N. nervosa and N. obliqua for their use in dendroclimatology.Fil: Bonada, Anabela Carmen. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Provincia de Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Universidad Nacional de Cuyo. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales; Argentina. University of Guelph; CanadáFil: Amoroso, Mariano Martin. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigaciones en Recursos Naturales, Agroecología y Desarrollo Rural. - Universidad Nacional de Rio Negro. Instituto de Investigaciones en Recursos Naturales, Agroecología y Desarrollo Rural; ArgentinaFil: Gedalof, Ze´Ef. University of Guelph; Canad
Members of the Darwin Tree of Life Barcoding author list
No full textThis document holds a record of the individuals from the Darwin Tree of Life Barcoding team who should be considered coauthors of publications arising from the work of the Darwin Tree of Life project (https://www.darwintreeoflife.org)
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Liana - host tree associations in a subtropical montane forest of northwestern Argentina
Get PDFIn a subtropical montane forest of north-western Argentina (27°S, 1000 m elevation), we analysed the effect of crown illumination, trunk diameter, foliar phenology and tree species identity as determinants of liana–host tree associations, as well as the spatial pattern of liana abundance in a 6-ha permanent plot. We recorded 2346 liana individuals 2 cm and 2320 trees 10 cm dbh. Sixty-five per cent of the trees hosted at least one liana stem. Large and well-lit trees were more likely to support lianas and supported more liana abundance than small and shaded trees. Yet, when trees were standardized by their size (liana basal area/tree basal area ratio), lianas were more abundant in smaller and less-exposed trees. Foliar phenology and tree species identity showed no association with the frequency of liana colonization and their abundance. Overall, tree features played a minor or even neutral role in structuring the liana community within this forest. Instead, lianas showed a positive autocorrelation at spatial scales up to 40 m. This suggests that lianas might be mostly structured by light-and dispersal-related factors such as those involving canopy access or canopy disturbances, with a negligible effect of host species identity and foliar phenology.Fil: Malizia, Agustina. Universidad Nacional de Tucumán. Facultad de Ciencias Naturales e Instituto Miguel Lillo. Laboratorio de Investigaciones Ecológicas de las Yungas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán; ArgentinaFil: Grau, Hector Ricardo. Universidad Nacional de Tucumán. Facultad de Ciencias Naturales e Instituto Miguel Lillo. Instituto Miguel Lillo; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán; Argentin
Members of the Wellcome Sanger Institute Tree of Life programme author list
No full textThis document holds a record of the individuals from the Wellcome Sanger Institute who should be considered coauthors of publications arising from the work of the Tree of Life programme (https://www.sanger.ac.uk/programme/tree-of-life/)
Author-Driven Approaches to Computational Narrative Design for Games
Get PDFAccessible Head Mounted Displays (HMD) have provided mass access to Extended Reality (XR) content as never before. One of the key complaints from HMD owners, however, is the lack of substantial high-quality content (Moore 2017). Coupled with the domain-specific topic of presence, which describes a state beyond the concept of immersion instead with the user feeling part of the virtual world. Utilizing traditional production techniques cost and the duration of the resultant product are inextricably linked, although some progress reducing manual hours has been made with the introduction of Procedural Content Generation (PCG); the focus of this shift has been on asset creation rather than narratives (Kapadia et al. 2017). While PCG can reduce the cost of production it does not however directly increase the duration of the game. The current solution from developers has been to implement game mechanics to increase the duration of the game, leading to a rise in arcade-style wave shooters (Anon 2018), however, this solution is not applicable to long-form content such as narrative-based Role Playing Games (RPG), story-based first-person action games and interactive narratives. The intended contribution of this paper is both to describe the challenges to the academic knowledge in procedurally generated content and computational narratives but is also about studying how those approaches can be democratized, enabling wider adoption within the content creation community, with a view to their eventual use within non-entertainment sectors
The family Cyatheaceae (Pteridophyta) in Argentina
Get PDFLa familia Cyatheaceae comprende alrededor de 500 especies de helechos arborescentes. Su distribución es pantropical y en Argentina se encuentra representada por 4 especies, reunidas en los géneros Alsophila y Cyathea: A. setosa, A. odonelliana, C. atrovirens y C. delgadii. En este trabajo se presenta una actualización de la información disponible hasta el momento referente a estas especies. Se exponen microfotografías de las esporas, que presentan la superficie con lomos en Alsophila y con cordones en Cyathea. Se ilustran los indusios y escamas de la base de los pecíolos, que son de importancia fundamental para la diferenciación de las especies estudiadas. Asimismo se presenta un mapa de distribución y una clave de las especies que crecen en Argentina.The family Cyatheaceae comprises about 500 species of tree ferns. Their distribution is pantropical and in Argentina is represented by four species, grouped in genera Alsophila y Cyathea: A. setosa, A. odonelliana, C. atrovirens and C. delgadii. In this paper, an update of the available information of the mentioned species is presented. A key to diferentiate the species growing in Argentina, their descriptions and a distribution map are also given. Spores are ridged in Alsophila and with rodlets in Cyathea. Indusia and scales of petiole basis are also illustrated.Fil: Marquez, Gonzalo Javier. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo; Argentin
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