Search results for "RSA"
showing 10 items of 4345 documents
A pedotransfer function for estimating the soil erodibility factor in Sicily
2009
The soil erodibility factor, K, of the Universal Soil Loss Equation (USLE) is a simple descriptor of the soil susceptibility to rill and interrill erosion. The original procedure for determining K needs a knowledge of soil particle size distribution (PSD), soil organic matter, OM, content, and soil structure and permeability characteristics. However, OM data are often missing and soil structure and permeability are not easily evaluated in regional analyses. The objective of this investigation was to develop a pedotransfer function (PTF) for estimating the K factor of the USLE in Sicily (south Italy) using only soil textural data. The nomograph soil erodibility factor and its associated firs…
Distribution and spatial structure of pelagic fish schools in relation to the nature of the seabed in the Sicily Channel (Central Mediterranean).
2009
Hydroacoustic data collected during two echosurveys carried out in the Sicily Channel in 1998 and 2002 were analysed to investigate the distribution and spatial structure of small pelagic fish species in relation to the sedimentological nature of the sea bottom. The study was carried out on two contiguous areas (labelled ZONE 1 and ZONE 2) of the continental shelf off the southern coast of Sicily, characterised by different dominant texture, ‘sand’ for ZONE 1 and ‘clayey-silt’ for ZONE 2. Simultaneous information on small pelagic fish schools and the seabed was obtained using a quantitative echo-sounder (SIMRAD EK500) that measures echoes due to the scattering from both fish schools and the…
Exotic Guavas are Foci of Forest Regeneration in Kenyan Farmland
2007
Fruiting trees in degraded areas are attractive for frugivorous birds and may become centers of regeneration. However, a number of tree species in degraded areas are exotic species. Thus, the question arises whether these exotic species can also act as foci for forest regeneration. In the farmland adjacent to Kakamega Forest, Kenya, we investigated the frugivore assemblage in, and seed rain and seedling establishment under, 29 fruiting exotic guava trees (Psidium guajava) at different distances to the forest. The results show that 40 frugivorous bird species visited guava trees. All of the seed and 82 percent of the seedling species found under the treecrowns were animal dispersed, 58 and 5…
Taxonomic uncertainty and a continental conundrum:Polypodium macaronesicumreassessed
2014
Data from the chloroplast trnL-F region are used to test the delimitation of putative diploid species in the Polypodium cambricum aggregate. In particular, we investigate the distinctiveness of the Macaronesian Polypodium macaronesicum, P. azoricum and the continental P. cambricum, investigate molecular diversity patterns within Macaronesia and establish the identity of putative P. macaronesicum material collected from an area in southern Spain, where it co-occurs with other Macaronesian elements. The analysis supports the distinction of Macaronesian and continental plants, with accessions from Macaronesia resolved as monophyletic. Greater haplotype diversity was found in Macaronesia than o…
Rare and threatened pondweed communities in anthropogenic water bodies of Opole Silesia (SW Poland)
2011
The paper presents results of geobotanic studies conducted in anthropogenic water bodies like excavation ponds, fish culture ponds, other ponds, dam reservoirs, ditches, channels and recreational pools incl. watering places in Opole Silesia and surroundings in the years 2002-2005. The research focused on occurrence of threatened and rare pondweed communities. As the result of the investigations of several dozen of water bodies, 28 localities of rare pondweed communities were documented by 75 phytosociological relevés. Associations of <em>Potametum trichoidis</em> J. et R Tx. in R. Tx. 1965, <em>Potametum praelongi</em> Sauer 1937, <em>P. alpini</em> Br.-B…
Modeling initial Neolithic dispersal. The first agricultural groups in West Mediterranean
2015
Abstract In previous research, the SE-NW time-trend in the age of the earliest Neolithic sites across Europe has been treated as a signal of a global-scale process that brought farming/herding economies to the continent. Residual variation from this global time-trend is generally treated as ‘noise’. A Complex Adaptive Systems perspective views this empirical record differently. The apparent time-trend is treated as an emergent consequence of the interactions of individuals and groups of different scale. Here, we examine the dynamics of agricultural dispersals, using the rich body evidence available from the Iberian Peninsula as a case study. We integrate two complementary approaches: (1) cr…
Giudici e corsari nel Mediterraneo : il tribunale delle prede di Sicilia (1808-1813)
2016
In età napoleonica, durante il blocco continentale-negli anni del protettorato inglese sulla Sicilia-il Mediterraneo è lo scenario di un'indiscriminata guerra di corsa sotto tutte le bandiere che impone restrizioni agli scambi mercantili. Navigli nemici o persino neutrali sono una buona preda anche per i corsari di Sicilia, che corrono dal Tirreno all'Adriatico ai mari della Barberia a caccia di ricchi bottini di merci e uomini. La corsa sotto bandiera di Sua Maestà siciliana, assecondata da una legislazione favorevole e sorretta da una specifica magistratura, il Tribunale delle prede, si dispiega dal 1808 al 1813. I corsari della regina e di armatori privati, il capo di Alta polizia e il c…
Global connectedness in higher education : student voices on the value of cross-cultural learning dialogue
2015
The study explores how sense of global connectedness can be enhanced by creating opportunities for cross-cultural dialogue in higher education. Thematic analysis of randomly selected 15 learning journals, students’ reflections on their learning during an international seminar was used to identify students’ significant learning experiences. The results emphasise the added value of diversity (geographical, disciplinary, cultural and social) among students, faculty and invited presenters for creating meaningful learning. Furthermore, they suggest that designing an integrated approach of contents, contexts and activities for critical engagement in global dialogue and knowledge generation in hig…
Fostering sustained teacher learning: a longitudinal assessment of the influence of vision building and goal interdependence on information sharing
2020
To support school improvement, understanding the mechanisms that enhance teachers’ engagement in professional learning activities within schools over time is paramount. The purpose of this three-wave longitudinal study is to examine the role of workplace conditions (school leaders’ vision building and teams’ shared goals), in supporting teachers’ engagement in information sharing over time. To test the directionality of the relationships between the concepts, we analyzed survey data from 655 vocational education and training teachers in the Netherlands using a cross-lagged panel model. Results suggest that teachers’ engagement in information sharing remains stable over time, and the results…
Palīgteikumu veidi ceļojumu emuāros
2018
Dotais pētījums apskata palīgteikumu lietojumu ceļojumu emuāros, kuru aktualitāti nosaka digitālo mediju popularitāte un viegli pieejami ceļojumi. Paraugi pētījumam tika ievākti no ceļojumu emuāriem un analizēti saskaņā ar apskatīto teoriju par palīgteikumiem. Teorētiskais pārskats definē trīs izteiktus palīgteikumu veidus. Pētījuma rezultāti norāda, ka analizētajos tekstos visbiežāk izmantotais palīgteikuma tips ir laika un nosacījuma apstākļa palīgteikums, jo, izmantojot tos, autori apraksta savu ceļojumu apstākļus. Īpaši rūpīgi tiek aprakstīti laiks un alternatīvas. Pētījums arī vērš uzmanību uz to, ka dažādas palīgteikumu lietojuma tendences ceļojumu emuāros