Resultados de investigación

De data base shows the results of a new methodology to determine the breakage distribution function parameters to be used in High pressure grinding rolls modelling. The piston die test tries to simulate a high pressure enviroment, thus the resulted particle size distribution can be normalized to describe a breakage mechanism. Furthermore, one example of how to obtain the breakage function parameters is presented., The modelling of high pressure grinding rolls is described by the population balance model, a mass balance which includes several functions that are related to the mineral characteristics, material kinetics and operative conditions of the device. The breakage distribution function is one of these functions and refers to the way in which the daughter particles are generated by the process of comminution. The piston-die press is presented as a methodology to determine the breakage distribution function of two different materials, from the mechanical response point of view: altered granite and a cal-silicate material. The aim is to determine the relation between the operative conditions and the mineral characteristics in order to explain and predict the breakage function parameters. The materials were characterised using XRD and single compression strength tests. The altered granite is a brittle material, which generates more fines under single compression conditions compared to bed compression conditions, mainly due to the mineral composition and the response of the material to the breakage action. The cal-silicate material shows a normal trend in its breakage behaviour. As is expected, the mineralogical characterisation is a useful tool to predict the values of the parameters of the breakage distribution function., 1

Using a previous mechanical characterization of two types of material, several lab-test work have been done. The data shows the particle size distribution of these tests, all the inputs and the model simulation presented in the related paper to this data base. The new mathematical approach use the operative conditions and the feed particle size distribution to obtain a product, which is compared with the lab-test results, An improved approach is presented to model the product particle size distribution resulting from grinding in high-pressure roll crusher with the aim to be used in standard high-pressure grinding rolls (HPGR). This approach uses different breakage distribution function parameter values for a single particle compression condition and a bed compression condition. Two materials were used for the experiments; altered Ta-bearing granite and a calc-silicate tungsten ore. A set of experiments was performed with constant operative conditions, while varying a selected condition to study the influence of the equipment set-up on the model. The material was comminuted using a previously determined specific pressing force, varying the feed particle size, roll speed and the static gap. A fourth group of experiments were performed varying the specific pressing force. Experimental results show the high performance of the comminution in a high-pressure environment. The static gap was the key in order to control the product particle size. A mathematical approach to predict the product particle size distribution is presented and it showed a good fit when compared to experimental data. This is the case when a narrow particle size fraction feed is used, but the fit became remarkably good with a multi-size feed distribution. However, when varying the specific pressing force in the case of the calc-silicate material, the results were not completely accurate. The hypothesis of simultaneous single particle compression and bed compression for different size ranges and with different parameters of the distribution function was probed and reinforced by various simulations that exchanged bed compression parameters over the single particle compression distribution function, and vice versa., 1

Analitical data of several minerals (quartz, K-feldspar, plagioclase, Monazite) of the albitized granites of the Variscan basement in Europe. The samples come from the Catalan Coastal Ranges, the Pyrenees, the Morvan massif and the Sudetes. Most of this data have been used in several papers and in the Cares Fàbrega PhD Thesis., 1

Dades primàries associades a un article publicat a la revista PeerJ https://doi.org/10.7717/peerj.5440

Dades primàries associades a un article pendent de publicació a la revista PlosOne.

Datos asociados a: J. Remesal Rodríguez, J. Moros Diaz (en prensa) “Los negocios de C. Iuventius Albinus en la Bética”. CEIPAC, Universidad de Barcelona., Los dendrogramas son una nueva herramienta de estudio que nos permite organizar los sellos de un determinado taller de manera más eficiente que la que conseguimos con los corpora o catálogos tradicionales. La idea es generar un sistema epigráficamente lógico y eminentemente gráfico que agrupa los sellos a partir de sus contenidos y los organiza con un esquema: FAMILIA → ESTRUCTURA → LECTURA → MATRIZ. Con este tipo de organización de los datos tendremos desplegados todos los elementos que necesitamos conocer para interpretar la serie y reconstruir, al menos, la parte del sistema organizativo del taller que ha llegado hasta nosotros.

Dades primàries associades a un article acceptat publicat a la revista Scientific Reports https://doi.org/10.1038/s41598-018-34100-8, Palate breadth of South American sea lions (Otaria flavescens), South American fur seals (Arctocephalus australis) and Franciscana dolphins (Pontoporia blainvillei) from Río de la Plata estuary. Stable isotope values (δ13C and δ15N) and standard length of the Franciscana dolphin (Pontoporia blainvillei) and potential prey species off Río de la Plata estuary. δ13C and δ15N: values not corrected for isotopic baseline shifts; δ13Ccor and δ15Ncor: values corrected for isotopic baseline shifts.

Dades associades a l'article: Vicente Royuela, Paolo Veneri & Raul Ramos (2018): The short-run relationship between inequality and growth: evidence from OECD regions during the Great Recession, Regional Studies, DOI: 10.1080/00343404.2018.1476752, This dataset is the basis of the work titled “The short-run relationship between inequality and growth: evidence from OECD regions during the Great Recession”, published in Regional Studies (DOI: 10.1080/00343404.2018.1476752). This paper provides evidence on the relationship between income inequality and economic growth in Organisation for Economic Co-operation and Development (OECD) regions during the decade 2003–13. It combines household survey data and macroeconomic databases, covering over 200 comparable regions in 15 OECD countries. The econometric results, based on two alternative sets of instruments, highlight a general negative association between inequalities and economic growth since the start of the economic crisis. This relationship is sensitive to the type of urban structure. Higher inequalities seem to be more detrimental for growth in regions characterized by medium to large-sized cities, while regions characterized by small cities and rural areas are less affected.

Mapes sobre diferents tipus d’impactes en tot el Mar Mediterrani. Dades primàries (mapes) associades a un article acceptat per la revista Scientific Reports (2018). Publicat a: https://doi.org/10.1038/s41598-018-33237-w, Dades primàries (mapes) associades a un article publicat a la revista Scientific Reports, 2018, vol. 8. http://doi.org/10.1038/s41598-018-33237-w

Dades primàries associades a un article pendent de publicació: Navas-Fernández, Miguel; Abadal, Ernest (2018). "Les revistes científiques de Catalunya 2014-2017". Anuari de l'Observatori de Biblioteques, Llibres i Lectura, vol 5., Podeu consultar l'article resultat al camp recurs relacionat