Search results for "Tributi"
showing 10 items of 6415 documents
A Synopsis of the Genus Stipa (Poaceae) in Middle Asia, Including a Key to Species Identification, an Annotated Checklist, and Phytogeographic Analys…
2020
The genus Stipa L. comprises over 150 species, all native to the Old World, where they grow in warm temperate regions throughout Europe, Asia, and North Africa. It is one of the largest genera in the family Poaceae in Middle Asia, where one of its diversity hotspots is located. However, identification of Middle Asian Stipa species is difficult because of the lack of new, comprehensive taxonomic studies including all of the species recorded in the region. We present a critical review of the Mid-Asian representatives of Stipa, together with an identification key and taxonomic listing. We relied on both published and unpublished information for the taxa involved, many of which are poorly known…
The King’s Lace Bug Recaredus rex Distant, 1909 (Hemiptera: Heteroptera: Tingidae): Systematic Position, First Palaearctic and Afrotropical Rec…
2022
The systematic position and actual distribution of Recaredus rex, for a long time one of the most enigmatic lace bug genus and species, is very obscure because only the type specimen and three other individuals from India are known to date. In the present paper, we report the first records of R. rex from the Palaearctic region (Iran) and tropical Africa (Ghana). Based on the occurrence localities and climatic variables, we predict potentially useful ecological niches for this species using Maxent software. The areas with the best environmental conditions for R. rex indicated in our studies suggest its possible Palaeotropical distribution. Moreover, we regard these results as a good starting…
Camera trapping the European wildcat (Felis silvestris silvestris) in Sicily (Southern Italy): preliminary results
2009
The wildcat is an elusive species that is threatened with extinction in many parts of its range. In Sicily it still lives in a wide range of habitats. During 2006, camera traps were used to investigate the distribution of the wildcat over a 660 ha wide area on the south-western slope of Mount Etna (NE Sicily). Twelve out of 18 trapping stations provided a total of 24 photographs. Nine different individuals were identified using morphological criteria. Our work confirms the suitability of camera trapping for monitoring elusive carnivores.
Marx y Engels y la división sexual del trabajo en la familia: ambigüedades, equívocos y vacíos teóricos
2018
Dada la importante influencia de Marx y Engels en el análisis de la estructura social, no sorprende el notable impacto de su obra en el estudio del papel de la mujer en la familia. Sin embargo, su herencia en este ámbito sociológico ha dado lugar a interpretaciones muy polarizadas. Este artículo quiere aportar algo de luz evidenciando las contradicciones del marxismo al estudiar el papel de la mujer en la familia. Para ello se comparan las contribuciones de Marx y Engels para calibrar posibles diferencias en las posturas de dos autores que en otros ámbitos han presentado un pensamiento muy homogéneo. Los resultados obtenidos permiten afirmar que, a pesar de su innegable influencia en el pen…
Detection of cosmic filaments using the Candy model
2004
We propose to apply a marked point process to automatically delineate filaments of the large-scale structure in redshift catalogues. We illustrate the feasibility of the idea on an example of simulated catalogues, describe the procedure, and characterize the results. We find the distribution of the length of the filaments, and suggest how to use this approach to obtain other statistical characteristics of filamentary networks.
Empirical Study on the Relationship between the Cross-Correlation among Stocks and the Stocks' Volatility Clustering
2013
In this paper we discuss univariate and multivariate statistical properties of volatility with the aim of understanding how these two aspects are interrelated. Specifically, we focus on the relationship between the cross-correlation among stock's volatilities and the volatility clustering. Volatility clustering is related to the memory property of the volatility time-series and therefore to its predictability. Our results show that there exists a relationship between the level of predictability of any volatility time-series and the amount of its inter-dependence with other assets. In all considered cases, the more the asset is linked to other assets, the more its volatility keeps memory of …
Inherent information in the prices of options
2018
Esta tesis tiene como objetivo analizar el contenido informacional de los precios observados de las opciones. En este caso particular, teniendo diferentes opciones sobre el mismo subyacente y con la misma fecha de vencimiento, podemos obtener información sobre la función de densidad neutral al riesgo (RND). Éstas son las densidades con las que los agentes valoran los activos derivados, y en definitiva cómo ponen precio a unidades de consumo en diferentes estados de la naturaleza futuros. Esta información implícita en el precio de las opciones es considerada información forward-looking (con miras al futuro). Esta tesis consta de tres capítulos enfocados a analizar diferentes aspectos de los …
Fiscal consolidation and income distribution
2016
This working paper attempts to shed light on distributional effects of recent fiscal consolidation policies, mainly through the channel of in-kind public transfers. We look at the distribution of income in 16 EU countries during the recent global financial and economic crisis, and the subsequent period of fiscal consolidation. Experiences in terms of the depth of the recession and the policies implemented to deal with vary greatly across EU countries. We illustrate this diversity, and show how the crisis has accentuated the differences among EU countries, both in income levels and in inequality. The effects of the public sector on household income distribution have traditionally been measur…
Rumicetum palustris (TIMÁR 1950) W. FISCHER 1978, new plant community from Bidentetea tripartiti R. Tx., LOHM. ET Prsg 1950 class in SW Poland
2016
Natural water reservoirs are very valuable floristic sites in Poland. Among them, the most important for preservation of biodiversity of plant communities are lakes, rivers, oxbow lakes and fishponds. The long-term process of human pressure on habitats of this type caused disturbance to their biological balance. Changes in the water regime, industrial development and chemisation of agriculture, especially in the period of last two hundred years, led to systematic disappearance of localities of many plant communities. Rumicetum palustris (Timár 1950) W. Fischer 1978, of Bidentetea tripartiti R. Tx., Lohm. et Prsg 1950 class, has been described for the first time in Hungary and Germany. This …
Gnaphalio uliginosi-eleocharitetum acicularis Passarge 1999, new plant community in Poland
2017
Zbiorniki wodne są bardzo cennymi miejscami florystycznymi w Polsce. Wśród nich najważniejsze dla zachowania różnorodności biologicznej flory są stawy rybne. Długookresowy proces oddziaływania ludzkiego na tego typu siedliska powodował zakłócenia w ich równowadze biologicznej. Zmiany w systemie wodnym, rozwój przemysłowy i chemizacja rolnictwa, zwłaszcza w okresie ostatnich dwóch stuleci, doprowadziły do zaniku wielu gatunków roślin oraz zbiorowisk roślinnych. Zespół Gnaphalio uliginosi-Eleocharitetum acicularis Passarge 1999 z klasy Isoëto-Nanojuncetea Br.-Bl. et Tx. 1943, po raz pierwszy został opisany w Niemczech. Rośnie na piaszczystych lub mulistych brzegach rzek, starorzeczach i w sta…