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beatriz salazar

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Ebookslibrarylinknj

technolibrary

160511 バス列(内部向け10分)

隆司

The sequential extraction method SEDEX (sedimentary extraction) modificated by ANDERSON & DELANEY (2000) has been used to quantify separately four sedimentary phosphorus reservoirs in sediments of the gulf of Paria and the venezuelan atlantic coast: adsorbed or labile plus P-associated to oxides (F1), P-authigenic (F2), P-detrital (F3) and P-organic (F4). The marine and continental origin of the sediments was determined by separation of detrital apatite (continental) and carbonate fluorapatite (CFA) of marine origin. The total phosphorus concentrations are low within the gulf of Paria and the atlantic venezuelan coast in comparison with other coastal areas (2.38 μmol g-1 to 6.84 μmol g-1) and is mainly in detrital form (0.78 to 4.61 μmol g-1). In decreasing order the concentrations are: organic (0.56 a 2.47 μmol g-1), adsorbed or labile phosphorus plus associated oxides (0, 04 to 0. 56 μmol g-1) > autigenic phosphorus (0.04 to 0.31 μmol g-1). ANOVA statistical tests (P < 0.05) show discrepancies only in the concentrations of the adsorbed or labile phosphorus plus associated oxides fractions, values being lower in the gulf of Paria. The results suggests that the principal sources are terrestrial lithogenic apatite from eroded material of the orogenic belts of the coastal Andes and Guiana shield and venezuelan and colombian plains which was then carried by waters of the Orinoco river and redistributed there. The organic material contribution of native origin and aloctonal is the second factor that controls the presence of phosphorus in the sediment. The marine contributions are noted towards the northeast end typified by the presence of carbonate fluoroapatite, indicating of transformation processes within the sediment.

ESPECIACIÓN QUÍMICA DE FÓSFORO EN SEDIMENTOS SUPERFICIALES DEL GOLFO DE PARIA...

Jubilado de la Universidad de Oriente (UDO), Venezuela.

Talk given at the "1st Summer Datathon on Linguistic Linked Open Data (SD-LLOD-15)" In this talk we will describe our experience when publishing and, more crucially, consuming Linked Data at the Spanish CLARIN Knowledge Centre (http://lod.iula.upf.edu). The center includes a Catalog of NLP resources & tools which aims to promote the use of language technology to researches of Humanities and Social Sciences. Though the original data set followed the XML/XSD schema, this was rewritten in accordance to the LOD approach in order to maximize the information contained in our repositories and to be able to enrich the data there. We will addresses some critical aspects when RDFying XSD/XML data focusing on the strategy followed when mapping controlled vocabularies expressed in XML enumerations; when dealing with certain unstructured data (those where input strings may generate relevant instances); and when addressing identity resolution and linking tasks once the eventual instances are RDFied. Here we will also report on data cleansing, a crucial and unavoidable task which we addressed as an incremental process where SPARQL played an important role. We will see that some of the decisions taken depend on the eventual application we have in mind. The requirements of our Catalog (implemented as a web browser) include: displaying data to the user in a comprehensive way; aggregating external data in a sensitive manner and making hidden implicit relations explicit. In addition, the system needs to provide fresh data (regularly updated) in a quick response time. Finally, we will report on our experiences when addressing data integration and enrichment (via data mashup). We experimented with different strategies (e.g. using external URIS vs caching local data) and faced different problems (time latency, dereferencing external URIS) that may be useful to share.

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Ebookslibrarylinknj

160511 バス列(内部向け10分)

ESPECIACIÓN QUÍMICA DE FÓSFORO EN SEDIMENTOS SUPERFICIALES DEL GOLFO DE PARIA...

“Publishing and Consuming Linked Data. (Lessons learnt when using LOD in an a...

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