Papers by Antonio Vaamonde Liste
Do crises Really Catalyze Creative Destruction? A Critical Reflection on Firm Survival
SAGE open, Apr 1, 2024
Quality index for ornamental slate deposits
Engineering Geology, Sep 1, 1998
A methodology for exploitation of ornamental slate deposits was developed from data obtained from... more A methodology for exploitation of ornamental slate deposits was developed from data obtained from borehole exploration. The method begins with the definition of geological, geotechnical and aesthetic parameters that determine the quality of the slate deposit. Then a collection of data from continuous sampling exploration was carried out in order to propose a quality index through multivariate statistical techniques that
Temporal trends of Cd, Cu, Hg, Pb and Zn in mussel (Mytilus galloprovincialis) from the Spanish North-Atlantic coast 1991–1999
Science of The Total Environment, Apr 1, 2002
Temporal trends for heavy metals (Cd, Cu, Hg, Pb and Zn) in mussel (Mytilus galloprovincialis) fr... more Temporal trends for heavy metals (Cd, Cu, Hg, Pb and Zn) in mussel (Mytilus galloprovincialis) from the Galician and Cantabrian areas in Spain, where samples were yearly collected from 1991 to 1999, are presented. This study was carried out by the Centro Oceanográfico de Vigo of the Instituto Español de Oceanografia (I.E.O.) as part of the Spanish contribution to the Joint Assessment and Monitoring Programme (JAMP) of the OSPAR Convention. The experimental work and subsequent statistical treatment, following OSPAR procedures and guidelines, are described. In order to carry out the statistical treatment of the data, median values of the different shell length classes were used for each contaminant, year and area. The Kendall T-b correlation coefficient was used with the purpose of demonstrating the existence of a downward significant temporal trend in the pollution levels, according to the advice of ICES Working Group on Statistical Aspects of Environmental Monitoring. A decrease of copper levels was detected in Vigo, Pontevedra and Arosa, of mercury in Pontevedra and A Coruña, of lead in Vigo, Pontevedra, A Coruña and Bilbao and of zinc in Pontevedra and A Coruña. However, a cadmium positive trend was registered at Ria de Vigo. No significant trends were detected in the other cases.
El objetivo de este trabajo es mostrar las utilidades del programa informático ModestR, en estudi... more El objetivo de este trabajo es mostrar las utilidades del programa informático ModestR, en estudios sobre distribución de especies en ecosistemas marinos y de agua dulce de Colombia. Este programa se encuentra disponible en la Web de manera gratuita: <http://www.ipez.es/ModestR>. Para enseñar y probar el funcionamiento de ModestR se trabajó con los datos disponibles en el Global Biodiversity Information Facility (GBIF, 2012) de los órdenes Characiformes y Siluriformes, como ejemplo de especies de peces dulciacuícolas, y del orden Carcharhiniformes de especies marinas. ModestR incluye en su fase inicial, dos aplicaciones: DataManager y MapMaker. La aplicación DataManager está diseñada para realizar manejo integrado de información taxonómica y mapas de distribución de cualquier grupo de especies. La aplicación MapMaker permite generar mapas de distribución de especies de cuatro formas diferentes: 1) importando un archivo CSV con el nombre de las especies y las coordenadas geográficas, 2) importando los datos automáticamente del GBIF, 3) importando las coordenadas geográficas generadas de modelos de distribución y 4) realizando mapas expertos, lo cual consiste en seleccionar las áreas de distribución, de acuerdo a los tipos de hábitats en que ocurre la o las especies en estudio. La posibilidad de trabajar con hábitats es una de las contribuciones más importantes de ModestR y, en particular, la de que los hábitats lóticos pequeños (quebradas, arroyos, etc.), los lóticos grandes (ríos) y los lenticos (lagunas, lagos, embalses, ciénagas, etc.) están cartografiados con muy alta resolución. Además, también se diferencian los ecosistemas marino y terrestre. A pesar de que este estudio se enfocó en especies de ecosistemas acuáticos, ModestR permite también realizar el mismo tipo de ejercicios con especies terrestres.
Journal of Food Quality, Aug 1, 2000
Tasting committees issuing subjective scores carry out the evaluation of wines, as for many other... more Tasting committees issuing subjective scores carry out the evaluation of wines, as for many other food products. Since high& qualijied experts form wine-tasting committees, the reliability of the scores is not generally questioned. Nevertheless, statistical methods can be applied to assess the work of tasters from the point of view of concordance. Agreement degree may be used as a measurement of the reliability of subjective rating. In order to evaluate both the extent of agreement as well as the circumstances that produce disagreement, this paper examines the subjective scores assigned to white wines awarded the Rias Baixas (Spain) denomination of origin certificate using statistical analysis. It will be seen that agreement depends significantly on the variability in scoring. A statistical method is proposed, which permits an appraisal, in terms of consistency and reliability, of the committees that evaluate wines for quality and authenticity.
Os nomes das viguesas e dos vigueses
Glaucopis: Boletín del Instituto de Estudios Vigueses, 2019
How media influences the perception and knowledge about climate change among students
EGU General Assembly Conference Abstracts, Apr 1, 2019
Engineering Geology, Sep 1, 2002
In order to characterise the saleable feldspar in a granite deposit, a methodology was developed ... more In order to characterise the saleable feldspar in a granite deposit, a methodology was developed in accordance with the exploitation process. This consisted of mechanically extracting the surface layer of the batholith and separating the feldspar from the quartz using the granulometric separation method, given that the size of the grains of the feldspar is greater than that of quartz. Following washing, grinding and magnetic separation of the feldspar in order to eliminate the ferromagnesium minerals, the saleable feldspar was characterised in terms of the factors that determine its market value, namely, its content in Al 2 O 3 , SiO 2 , Na 2 O and K 2 O. Following the opening of prospecting pits in the granite massif, samples were analysed in the laboratory using three different granulometric cuts and by reproducing the treatment process. The values for the quality variables of saleable feldspar were obtained, and the results were interpolated to the entire deposit using the kriging method. In order to summarise the information from the above-mentioned variables, a quality index was constructed using multivariate statistics and by employing market criteria, and subsequently, the values of the index were interpolated to the entire deposit using bidimensional kriging. The map of saleable quality feldspar from the deposit permits both affirmation of the treatment process yield for each granulometric cut and the planning of extraction from the deposit to obtain a homogeneous quality in the saleable feldspar.
Stochastic Environmental Research and Risk Assessment, Oct 1, 2004
Critical for an efficient and effective exploitation of a slate mine is to obtain information on ... more Critical for an efficient and effective exploitation of a slate mine is to obtain information on its technical quality, in other words, on the exploitability potential of the deposit. We applied support vector machines (SVM) and LS-boosting to the assessment of the technical quality of a new unexploited area of a mine, and compared the results to those obtained for kriging and neural networks. Firstly we analyzed the relationship between kriging and semiparametric SVM in a regularisation framework and explored the different alternatives to train these networks. Subsequently, in an attempt to combine both radial and projection structures, we formulated a boosting technique for radial basis function networks (RBFs) defined over projections in the input space (RBFPP). The application of these techniques to our test drilling data demonstrated a similar level of performance for all the estimators examined, with the main difference occurring in the shape of the respective deposit reconstructions. Therefore, in choosing between the different techniques, an essential aspect will be their ability to reproduce the morphological characteristics of the true process. In this paper we also compared the sparsity of the different solutions. SVMs, multilayer perceptron networks (MLPs), RBFs and RBFPP are more parsimonious than kriging or regularization networks (RNs), but radial estimators such as SVM and RBF tend to loose their sparsity when the estimated covariogram is used as kernel.
Mortalidad entre los pacientes adictos a opiáceos al cabo de 30 años de seguimiento
Adicciones, Mar 15, 2023
Engineering Geology, Sep 1, 1997
When planning workings of slate extraction by mechanical means, it is important to know the quali... more When planning workings of slate extraction by mechanical means, it is important to know the quality of the rock mass to optimize the results of the cuttings in the extraction bank, because techniques to be used depend on relative percent of first quality or second quality slate. In this paper, a methodology for quality evaluation applied to slate extraction is developed in three phases, as a tool of support to the planning. The first phase consists of defining the geotechnical parameters that aÂect the bank and to appraise them in the visible faces. The second phase consists of applying multivariate statistical techniques related to discriminant analysis data to evaluate a quality function. This function can be seen as a recovery index of the slate mass, being its variance intervals established in the analyzed faces. The third phase consists of a forecast of the values of the index from visible faces to the inside of the extraction bank, using geostatistics to evaluate the quality of the mass and to plan the mechanical cutting works, in order to get the best results.
IFAC Proceedings Volumes, Sep 1, 1990
A new integrated CAD/CAM system is presented, for use with knitting machines. Because of the abse... more A new integrated CAD/CAM system is presented, for use with knitting machines. Because of the absence of standards, designers must deal with many different systems to do the same work. The proposed CAD/CAM system makes posible design and manufacturing with a set of different knitting machines. It incorporates users experience , making easy the traditionally hard job of knitting designers and manufacturers .
Infectious Disease Reports, Apr 19, 2023
This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY
Evaluation of the quality of a granite quarry
Engineering Geology, May 1, 1999
The determination of the quality of a mass of granite with a view to its exploitation for ornamen... more The determination of the quality of a mass of granite with a view to its exploitation for ornamental purposes is carried out by means of the identification of the geological, geotechnical and aesthetic factors that characterize the granite. In order to draw up an ...
Trastornos del comportamiento alimentario en sujetos jóvenes con DM Tipo I: evaluación psicológica de la violación de la dieta como condición que mantiene la no adherencia terapéutica
Psicoloxía clínica: anuario, 2009
On Consistency of Qualifications of Winetasting Panels. Application of Multivariate Statistical Methods
American Journal of Enology and Viticulture, 1997
Discriminant analysis is applied to a set of wine samples from Certified Origin "Rias Baixas... more Discriminant analysis is applied to a set of wine samples from Certified Origin "Rias Baixas" (Galicia, autonomous region in Northwest Spain). The purpose is to contrast the consistency of the qualifications of tasting panels to independent data obtained through physical and chemical analysis from the same samples. We intend to build some methods for non-subjective identification of wine samples made from a single grape variety.
Actualidades Biológicas
El objetivo de este trabajo es mostrar las utilidades del programa informático ModestR, en estudi... more El objetivo de este trabajo es mostrar las utilidades del programa informático ModestR, en estudios sobre distribución de especies en ecosistemas marinos y de agua dulce de Colombia. Este programa se encuentra disponible en la Web de manera gratuita: . Para enseñar y probar el funcionamiento de ModestR se trabajó con los datos disponibles en el Global Biodiversity Information Facility (GBIF, 2012) de los órdenes Characiformes y Siluriformes, como ejemplo de especies de peces dulciacuícolas, y del orden Carcharhiniformes de especies marinas. ModestR incluye en su fase inicial, dos aplicaciones: DataManager y MapMaker. La aplicación DataManager está diseñada para realizar manejo integrado de información taxonómica y mapas de distribución de cualquier grupo de especies. La aplicación MapMaker permite generar mapas de distribución de especies de cuatro formas diferentes: 1) importando un archivo CSV con el nombre de las especies y las coordenadas geográficas, 2) importando los datos aut...
Mathematical Geology, 2004
To carry out an efficient and effective exploitation of a slate mine, it is necessary to have det... more To carry out an efficient and effective exploitation of a slate mine, it is necessary to have detailed information about the production potential of the site. To assist us in estimating the quality of slate from a small set of drilling data within an unexploited portion of the mine, the following estimation techniques were applied: kriging, regularization networks (RN), multilayer perceptron (MLP) networks, and radial basis function (RBF) networks. Our numerical results for the test holes show that the best results were obtained using an RN (kriging) which takes into account the known anisotropy. Differing deposit configurations were obtained, depending on the method applied. Variations in the form of pockets were obtained when using a radial pattern with RBF, RN, and kriging models while a stratified pattern was obtained with the MLP model. Pockets are more suitable for a slate mine, which indicates that the selection of a technique should take account of the specific configuration of the deposit according to mineral type.
Comparison between Kriging, MLP and RBF in a slate mine
Quantitative Geology and Geostatistics
In order to asses the exploitability (Y=1 or Y=0) of a new unexploited area of a slate mine, we a... more In order to asses the exploitability (Y=1 or Y=0) of a new unexploited area of a slate mine, we apply the following estimation estimation techniques to a sample of drilling data: Kriging, Regularization Networks, (RN), Multilayer Perceptron networks (MLP) and Radial Basis Function Networks (RBF).
Evaluation of a slate extraction bank
Mining Technology, 2001
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Papers by Antonio Vaamonde Liste