T2{}^2K2{}^2: The Twitter Top-K Keywords Benchmark

Information retrieval from textual data focuses on the construction of vocabularies that contain weighted term tuples. Such vocabularies can then be exploited by various text analysis algorithms to extract new knowledge, e.g., top-k keywords, top-k documents, etc. Top-k keywords are casually used for various purposes, are often computed on-the-fly, and thus must be efficiently computed. To compare competing weighting schemes and database implementations, benchmarking is customary. To the best of our knowledge, no benchmark currently addresses these problems. Hence, in this paper, we present a top-k keywords benchmark, T${}^2$K${}^2$, which features a real tweet dataset and queries with various complexities and selectivities. T${}^2$K${}^2$ helps evaluate weighting schemes and database implementations in terms of computing performance. To illustrate T${}^2$K${}^2$'s relevance and genericity, we successfully performed tests on the TF-IDF and Okapi BM25 weighting schemes, on one hand, and on different relational (Oracle, PostgreSQL) and document-oriented (MongoDB) database implementations, on the other hand

Quality assurance through laboratory reference materials (LRMs): dataset for non-certified elements (Al, Fe, Li, Mn and Pb) in estuarine sediment BCR-277R

Datasets for aluminium (Al), iron (Fe), lithium (Li), manganese (Mn) and lead (Pb) in the commercial estuarine sediment BCR-277RThree specialized laboratories examined the determination of non-certified trace elements (Al, Fe, Li, Mn and Pb) in a commercial CRM and therefore, produced a so-called laboratory reference material (LRM). The dataset (total mass fractions and their associated uncertainties) were estimated both using parametric and non-parametric methods. The results provided a coherent assessment for all except for Pb, in agreement with the results found by the CRM producer. We discuss the feasibility of the implementation of small-sized specialized laboratory comparisons to produce LRMs (from CRMs) for non-certified chemicals and strongly discourage attempts by a single laboratory

A large scale survey of trace metal levels in coastal waters of the Western Mediterranean basin using caged mussels (Mytilus galloprovincialis).

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Parte IV. Evaluación del Estado del Medio Marino y definición del GES en la Demarcación Levantino-Balear. Descriptor 8

Informe de Evaluación del estado del Medio Marino y definición del GES en la Demarcación Levantina-Balear en relación al Descriptor

Parte IV. Evaluación del estado del Medio marino y definición del GES en la Demarcación Marina estrecho y Alborán. Descriptor 8

Se presenta la evaluación del estado del Medio Marino y definición del GES en la Demarcación Marina Estrecho y Alborán en relación al Descriptor 8 (Contaminantes químicos en sedimentos, peces y bivalvos y biomarcadores relacionados con la contaminación química en peces y bivalvos

The interest of the Spanish network of investigators in back pain for rehabilitation physician

Background: The Spanish Back Pain Research Network (REIDE) brings together teams of researchers and clinicians who are interested in nonspecific neck and back pain (BP). Its objective is to improve the efficacy, safety, effectiveness, and efficiency of the clinical management of BP. Method: The Network welcomes clinicians and researchers interested in BP. The only requirement to become a member of REIDE is to take part in one of its research projects, and any member can propose a new one. The Network supports those projects that are of interest to two or more groups by assuming their administration and management, which allows the researchers to focus on their task. Its working method ensures methodological quality, a multidisciplinary approach, and the clinical relevance of those projects that are carried out. Results: 179 researchers from 11 areas in Spain are involved in REIDE, including experts in all of the relevant fields of BP research. Most Spanish studies on BP that have been published in international scientific journals come from the teams involved in REIDE, and it currently has 13 ongoing research projects. Conclusions: The Network can help to enhance research among rehabilitation specialists who are interested in BP, and can contribute to the development of research projects which are of interest to the specialty. © 2005 Sociedad Española de Rehabilitación y Medicina Física (SERMEF) y Elsevier España, S.L