2,803 research outputs found
A quality management based on the Quality Model life cycle
Managing quality is a hard and expensive task that involves the execution and control of processes and techniques.
For a good quality management, it is important to know the current state and the objective to be
achieved. It is essential to take into account with a Quality Model that specifies the purposes of managing
quality. QuEF (Quality Evaluation Framework) is a framework to manage quality in MDWE (Model-driven
Web Engineering). This paper suggests managing quality but pointing out the Quality Model life cycle. The
purpose is to converge toward a quality continuous improvement by means of reducing effort and time.Ministerio de Ciencia e Innovación TIN2010-20057-C03-02Ministerio de Ciencia e Innovación TIN 2010-12312-EJunta de Andalucía TIC-578
El uso del método de los elementos de contorno en el cálculo dinámico de problemas axilsimétricos
VII CONGRESO NACIONAL DE INGENIERIA MECANICA En VALENCIAThe objetive of this paper is to show the flexibility of he B.E.M. for calculation of the dynamic impedances of axisymmetric rigid foundations in homogeneuos and layered media.
Beside introducing the below formulation the method is applied to the case of hemispherical foundation in order to show certain aspects of its behavior and the influence of different factors upen dynamical impedances such as internal soil damping and relative rigidity of the base in the case of two l ayered media.El objetivo de esta comunicación es mostrar la flexibilidad del Método de los Elementos de Contorno para abordar el cálculo de las impedancias dinámicas de las cimentaciones rígidas con simetría de revolución embebidas en medios homogéneos y estratificados. Además de presentar la formulación desarrollada, el método se aplica al caso de cimentaciones semiesféricas poniéndose de manifiesto ciertos aspectos de su comportamiento y la influencia de los diferentes factores sobre las impedancias dinámicas tales como: índice de amortiguamiento y rigidez relativa de la base para el caso de terrenos estratificados de tipo bicapa. Los resultados obtenidos se comparan con los de otros autores
Influencia de la distribución espacial de la excitación en la respuesta sísmica de puentes
XV Congreso Nacional de Ingeniería Mecánica, celebrado en Cádiz en 2002Se presenta un método general para estudiar la interacción dinámica suelo-estructura en la
respuesta sísmica de puentes sometidos a una excitación sísmica con variabilidad espacial.
Se ha desarrollado un modelo mixto de elementos de contorno y elementos finitos en tres
dimensiones que pennite tener en cuenta la respuesta sísmica del puente para distintos tipos
de excitación, configuraciones geométricas del puente, naturaleza y geometria del subsuelo
y del terreno. Se presentan resultados para un puente recto tipo viaducto, sobre semiespacio
elástico, sometido a distintos tipos de ondas incidentes, con ángulo variable respecto a la
vertical y al eje de la estructura
Trace elements and C and N isotope composition in two mushroom species from a mine-spill contaminated site
Fungi play a key role in the functioning of soil in terrestrial ecosystems, and in particular in the
remediation of degraded soils. The contribution of fungi to carbon and nutrient cycles, along with
their capability to mobilise soil trace elements, is well-known. However, the importance of life history
strategy for these functions has not yet been thoroughly studied. This study explored the soil-fungi
relationship of two wild edible fungi, the ectomycorrhizal Laccaria laccata and the saprotroph
Volvopluteus gloiocephalus. Fruiting bodies and surrounding soils in a mine-spill contaminated area
were analysed. Isotope analyses revealed Laccaria laccata fruiting bodies were 15N-enriched when
compared to Volvopluteus gloiocephalus, likely due to the transfer of 15N-depleted compounds to their
host plant. Moreover, Laccaria laccata fruiting bodies δ13C values were closer to host plant values than
surrounding soil, while Volvopluteus gloiocephalus matched the δ13C composition to that of the soil.
Fungal species presented high bioaccumulation and concentrations of Cd and Cu in their fruiting bodies.
Human consumption of these fruiting bodies may represent a toxicological risk due to their elevated Cd
concentrations
A Model-Driven Approach for Business Process Management
The Business Process Management is a common mechanism recommended by a high number of standards for the management of companies and organizations. In software companies this practice is every day more accepted and companies have to assume it, if they want to be competitive. However, the effective definition of these processes and mainly their maintenance and execution are not always easy tasks. This paper presents an approach based on the Model-Driven paradigm for Business Process Management in software companies. This solution offers a suitable mechanism that was implemented successfully in different companies with a tool case named NDTQ-Framework.Ministerio de Educación y Ciencia TIN2010-20057-C03-02Junta de Andalucía TIC-578
Proizvodnja ksilitola iz hidrolizata eukaliptusova drva u jeftinim fermentacijskim podlogama
Several aspects concerning the bioconversion of xylose-containing hydrolysates (obtained from Eucalyptus wood) into xylitol were assessed. Debaryomyces hansenii yeast strains were adapted to fermentation media (obtained either by prehydrolysis or autohydrolysis- posthydrolysis of wood) supplemented with low-cost nutrients. Media containing up to 80 g/L xylose were efficiently fermented when the hydrolysates were detoxified by charcoal adsorption and supplemented with corn steep liquor.Ispitano je nekoliko mogućnosti biokonverzije ksiloze iz hidrolizata, dobivenih iz eukaliptusova drva, u ksilitol. Sojevi Debaryomyces hansenii adaptirani su na fermentacijske podloge (dobivene predhidrolizom ili autohidrolizom-posthidrolizom drva) uz jeftine hranjive dodatke. Fermentacija je bila uspješna u podlozi s 80 g/L ksiloze ako su hidrolizati bili detoksificirani adsorpcijom na aktivnom ugljenu uz dodatak kukuruznog ekstrakta (CSL)
Quantum chaos in the mesoscopic device for the Josephson flux qubit
We show that the three-junction SQUID device designed for the Josephson flux
qubit can be used to study quantum chaos when operated at high energies. In the
parameter region where the system is classically chaotic we analyze the
spectral statistics. The nearest neighbor distributions are well fitted
by the Berry Robnik theory employing as free parameters the pure classical
measures of the chaotic and regular regions of phase space in the different
energy regions. The phase space representation of the wave functions is
obtained via the Husimi distributions and the localization of the states on
classical structures is analyzed.Comment: Final version, to be published in Phys. Rev. B. References added,
introduction and conclusions improve
Applying wrapper-based variable selection techniques to predict MFIs profitability: evidence from Peru
In this paper, we analyse the main factors explaining the profitability (ROA) of Microfinance Institutions (MFIs) in Peru from 2011 to 2107. We apply three wrapper techniques to asample of 168 Peruvians MFIs and 69 attributes obtained from MIX Market database. After running the algorithms M5', knearest neighbours (KNN) and Random Forest, we find that the M5' algorithm provides the best fit for predicting ROA. Particularly, the key variable of the regression tree is the percentage of expenses over assets and, depending on its value, it is followed by net income after taxes and before donations, or profit margins.En este trabajo, analizamos los principales factores que explican la rentabilidad (ROA) de las Instituciones de Microfinanzas (IMF) en Perú desde 2011 hasta 2107. Aplicamos tres técnicas de envoltura a una muestra de 168 IMF peruanas y 69 atributos obtenidos de la base de datos MIX Market. Después de ejecutar los algoritmos M5', vecinos knearest (KNN) y Random Forest, encontramos que el algoritmo M5' proporciona el mejor ajuste para predecir el ROA. En particular, la variable clave del árbol de regresión es el porcentaje de gastos sobre activos y, dependiendo de su valor, le sigue la utilidad neta después de impuestos y antes de donaciones o márgenes de utilidad
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