Non-Gaussian Geostatistical Modeling using (skew) t Processes

We propose a new model for regression and dependence analysis when addressing spatial data with possibly heavy tails and an asymmetric marginal distribution. We first propose a stationary process with $t$ marginals obtained through scale mixing of a Gaussian process with an inverse square root process with Gamma marginals. We then generalize this construction by considering a skew-Gaussian process, thus obtaining a process with skew-t marginal distributions. For the proposed (skew) $t$ process we study the second-order and geometrical properties and in the $t$ case, we provide analytic expressions for the bivariate distribution. In an extensive simulation study, we investigate the use of the weighted pairwise likelihood as a method of estimation for the $t$ process. Moreover we compare the performance of the optimal linear predictor of the $t$ process versus the optimal Gaussian predictor. Finally, the effectiveness of our methodology is illustrated by analyzing a georeferenced dataset on maximum temperatures in Australi

Construcción y validación de un instrumento multidimensional de medición de los valores intrinsecos de la actividad físico-deportiva (RPI N° 5230716)

Tesis - Doctor en Ciencias de la Salud - Universidad Nacional de Córdoba. Facultad de Ciencias Médicas. Secretaría de Graduados en Ciencias de la Salud, 2017 92 h. : tabl., 29 cm.Fil: Morales, María Marta del Valle. Universidad Nacional de Córdoba. Facultad de Ciencias Médicas. Escuela de Graduados; Argentina.Las Psicología aplicada al Deporte y en general las Ciencias de la Salud identifican al sedentarismo detectado en la población de jóvenes universitarios como un factor de riesgo para la salud. Por ello, se interesan en el diagrama de estrategias tendientes a lograr la adherencia a la práctica regular de las actividades físico deportivas. Este trabajo informa sobre el diseño y el análisis de las propiedades psicométricas de un cuestionario escalar para evaluar los valores que los jóvenes universitarios adjudican a la actividad físico- deportiva a partir de las propias vivencias que experimentan al realizarlas. Valores intrínsecos o contingentes a ella. La construcción de esta prueba intenta brindar una herramienta evaluativa que permita conocer las concepciones valorativas con las que el grupo a tratar califica el fenómeno a estudiar previo a la diagramación de estrategias de intervención. Los reactivos (ítems) que integran la escala, se diseñaron teniendo como guía orientadora los aportes teóricos de dos modelos Seirul.lo Vargas (1995) y Gómez Rijo (2001) que señalan la existencia de cuatro tipo de valores intrínsecos y los clasifican y definen como: Valor Agonístico, Valor Lúdico, Valor Hedonístico y Valor Higiénico.The Psychology applied to sport and general Health Sciences identified physical inactivity detected in the population of university students as a risk factor for health. Therefore, they interested in the diagram of strategies to achieve adherence to the regular practice of physical and sports activities. This paper reports on the design and analysis of the psychometric properties of a scale for the values that young university awarded physico sport activity from their own experiences that experience to perform questionnaire. Intrinsic values or contingent to it. The construction of this test is intended to provide an evaluation tool to provide a valuation concepts with which the group calls the phenomenon try to preintervention strategies diagramming study. Reagents (items ) that make up the scale were designed with as orientation guide the theoretical contributions of two models Seirul.lo Vargas (1995 ) and Gomez Rijo (2001 ) indicating the existence of four kinds of intrinsic values and classified and defined as : agonistic value , entertainment value , Hedonistic value and hygienic value. The conceptual scope of this scheme were modified from content analysis of open interviews with various members of the sports scene (athletes, technicians, professionals of applied sciences, etc.) that redefined locally. The study Content Validity of reagents was performed by the method of Judges (MAJ) which was attended by 11 experts professionals and 50 young men and women of similar characteristics to the target population.2019-06-2

Acercamiento histórico epistemológico de la optimización

El discurso escolar del contenido de programación lineal, en los establecimientos educacionales chilenos, se ha convertido en un proceso mecánico y sin sentido para el estudiante. Para revertir esta mirada, se intenta dar respuesta a la siguiente interrogante ¿Cuáles son los significados reales que emergen y dan fuerza a la programación lineal? Se evidenciará el estudio del rol actual de la programación lineal y los procesos históricos de su surgimiento, con el fin de identificar aquellos factores que le dan fuerza a su desarrollo y construcción

Value Chain: From iDMU to Shopfloor Documentation of Aeronautical Assemblies

Competition in the aerospace manufacturing companies has led them to continuously improve the efficiency of their processes from the conceptual phase to the start of production and during operation phase, providing services to clients. PLM (Product Lifecycle Management) is an end-to-end business solution which aims to provide an environment of information about the product and related processes available to the whole enterprise throughout the product’s lifecycle. Airbus designs and industrializes aircrafts using Concurrent Engineering methods since decades. The introduction of new PLM methods, procedures and tools, and the need to improve processes efficiency and reduce time-to-market, led Airbus to pursue the Collaborative Engineering method. Processes efficiency is also impacted by the variety of systems existing within Airbus. Interoperability rises as a solution to eliminate inefficiencies due to information exchange and transformations and it also provides a way to discover and reuse existing information. The ARIADNE project (Value chain: from iDMU to shopfloor documentation of aeronautical assemblies) was launched to support the industrialization process of an aerostructure by implementing the industrial Digital Mock-Up (iDMU) concept in a Collaborative Engineering framework. Interoperability becomes an important research workpackage in ARIADNE to exploit and reuse the information contained in the iDMU and to create the shop floor documentation. This paper presents the context, the conceptual approach, the methodology adopted and preliminary results of the project

El "análisis de los caracteres", signos ambiguos y la idea de "sustitución" según Leibniz

Nuestro propósito en este escrito será investigar el tema de la "sustitución" en Leibniz en el contexto de lo que este autor denomina ars inveniendi (arte inventivo). Consideraremos, más específicamente, la utilización de algunas herramientas simbólicas empleadas en sus trabajos matemáticos a la luz de una serie de fragmentos filosóficos del autor inmediatamente posteriores a su estancia en París (1672 - 1676), período en el que se trazan las bases fundamentales del cálculo infinitesimal

Los usos de la optimización en una situación de selección

En el discurso Matemático Escolar la optimización es un proceso desprovisto de significaciones, procedimientos y argumentaciones, ya que existe una mayor centración en los objetos matemáticos utilizados en la aplicación de métodos de optimización que en sus usos. En este artículo se justifica la formulación de un Marco de Referencia de los usos de la optimización para valorar la justificación funcional que demandan otros dominios de conocimiento. De esta manera, se busca estrechar la distancia existente entre la matemática escolar y el cotidiano, con el fin de resignificar los usos de la optimización en el discurso Matemático Escolar

Industrial scale : estratègies metropolitanes per l'eficiència del transport industrial

El projecte "Industrial Scale" preten detectar i potenciar les condicions de contorn que ofereix un espai com el de l'estació de RENFE de Rubí. En primer lloc, detectem que és una estació molt infrautilitzada i d'ús pràcticament marginal, en un context totalment perifèric.D'altra banda, veiem potencial i oportunitat en la connectivitat a xarxes de mobilitat territorials, i la proximitat a grans superfícies de teixit industrial de caire productiu. A través d'un procés d'investigació hem observat que el transport amb tren és més eficient a nivell econòmic, energètic i ambiental. Amb aquestes condicions de contorn decidim intervenir sobre l'espai de l'estació de RENFE, proposant un canvi d'ús d'estació, de passatgers a port sec de mercaderies. Aquesta actuació permetrà al teixit industrial local una alternativa al transport rodat, a part de noves oportunitats i relacions econòmiques vinculades al corredor mediterrani de mercaderies, i per tant, un impacte socio-econòmic a la zona

Successful Latin American initiatives in biophysics

The II LAFeBS Congress aimed to promote a closer interaction between Latin American and Iberian Peninsula scientists in their respective fields of research, from structural proteomics to molecular bioenergetics. The speakers at this event reflected the importance and development of Biophysics in Latin American Countries, including Portugal and Spain; with 13 of them being invited to write review articles for this special issue of Biophysical Reviews. We hope that the integration of biophysics and biophysicists in Latin America, together with Portugal and Spain, through LAFeBS and POSLATAM can contribute to the future development of biophysics in these two historical partner regions.Instituto Multidisciplinario de Biología Celula

Potential of aqueous ozone to control aflatoxigenic fungi in Brazil nuts

The Brazil nut (Bertholethia excelsa) is an important non timber forest product (NTFP) from the Amazonian forest. Despite their nutritious value, Brazil nuts are susceptible to contamination with Aspergillus section Flavi fungi and consequently with aflatoxins. Since aqueous ozone reduces microorganisms population and has oxidant effect on aflatoxins, the effect of ozone on. Both natural and artificially contaminated Brasil nuts were studied in the present work. The former were inoculated with either 1x106 or 1x107 conidia mL-1 of A. flavus (MUM 9201). Previous assays were carried out to determine optimal parameters of the treatment. Different aqueous ozone contact time was assayed. The duration was controlled by the addition of a sodium formate solution. Such assays evidenced that the effect of ozone is almost immediate. Also, different ozone concentrations were assayed. The optimum ozone concentration depended on the initial viable spores on the nutshell. Also, the effect of the ozonization on the shell nut color was assessed by measuring chromaticity values of the treated fruits in the L*a*b* space coordinates. High concentrations of ozone affected both the luminosity and the hue of the nutshell. Finally, a concentrated aqueous ozone solution was assayed on both natural and artificially contaminated nuts. The remaining viable spores in the ozone solution were recorded and the rate of inactivation for each treatment was determined by assessing the ratio between the CFU of each treatment and the control. Ozonized nuts were also plated on MEA to recover the fungi population. Aqueous ozone was effective in reducing the conidia of Aspergillus flavus and the natural fungal population associated to Brazil nuts, although it seems to affect external appearance of the shell. The aqueous ozone solution may be recommended to control other mycotoxin producer Aspergilli, since ozone is regarded a generally recognized as safe (GRAS) product and it has been already used in many agricultural products, including the organically labels one like Brazil nuts.Fundação para a Ciência e a Tecnologia (FCT

Mohos productores de micotoxinas

info:eu-repo/semantics/publishedVersio