Search results for "technical"
showing 10 items of 955 documents
Extraction of thermal characteristics of surrounding geological layers of a geothermal heat exchanger by 3D numerical simulations
2016
Ground thermal conductivity and borehole thermal resistance are key parameters for the design of closed Ground-Source Heat Pump (GSHP) systems. The standard method to determine these parameters is the Thermal Response Test (TRT). This test analyses the ground thermal response to a constant heat power injection or extraction by measuring inlet and outlet temperatures of the fluid at the top of the borehole heat exchanger. These data are commonly evaluated by models considering the ground being homogeneous and isotropic. This approach estimates an effective ground thermal conductivity representing an average of the thermal conductivity of the different layers crossed by perforation. In order …
Effect of steel collars on the seismic behaviour of axially-cracked historical stone columns
2014
Granite and heavy stone circular columns could often be found in the cultural heritage among ancient churches and historical buildings in all the Mediterranean area. Their good strength properties allow them to carry big load values, while their bright colours and aesthetical characteristics were used by a lot of architects in the past to achieve structural solutions with great visual impact.Though such materials have great compressive strength values, environmental effects, especially long term effects, can damage the structural members, by cracking them. In this way the slenderness of the column increases, and the presence of an imposed ground motion can be very dangerous, since the colum…
Effect of epicentral direction on seismic response of asymmetric buildings
1984
The paper deals with the influence of the epicentral direction on the displacement and stress response of multistorey asymmetric buildings to earthquake horizontal ground motion. A method is given for computing for each plane frame of the complex structure a particular direction of the bidirectional stationary random input for which the horizontal floor displacement of the given frame is maximized. It is shown that this direction can be considered conservative for the corresponding non-stationary process.
Detecting the chaotic nature of advection in complex river flows
2012
In order to detect signatures of chaotic advection in river surface motion, surface buoys equipped with GPS were deployed in a field experiment in River Danube, Hungary. The buoys were released in the vicinity of groynes where complex mixing processes occur. A detailed analysis of the trajectories was carried out, focusing on the time evolution of the distance between buoy pairs. The analysis included the determination and comparison of local Lyapunov exponents and prediction times of finite-time hyperbolic behaviour, which is related to strong mixing. Despite of the small number of applied buoys we found evidence on Lagrangian chaos in the wake of a groyne field. In order to supplement the…
Estándar del inversor prudente y confianza legítima
2019
El trabajo analiza el conflicto planteado por las reformas del régimen retributivo de la electricidad renovable desde la perspectiva del principio de protección de la confianza del derecho de la Unión Europea. Se detiene en la jurisprudencia del Tribunal de Justicia sobre el alcance de dicho principio en el ámbito normativo; en especial, en el criterio del «operador económico prudente y diligente». El análisis identifica carencias en la jurisprudencia de los tribunales españoles («riesgo regulatorio»), como la errónea aplicación del estándar del inversor prudente, o la falta de ponderación del interés de la Unión.
De nuevo sobre la prevalencia del derecho estatal y la inaplicación judicial del derecho autonómico
2017
En varias sentencias recientes, el Tribunal Constitucional ha entendido por primera vez aplicable la clausula de prevalencia en caso de incompatibilidad sobrevenida norma basica-norma autonomica de desarrollo; ha negado dicha aplicacion cuando la incompatibilidad es originaria. Se plantea si tiene sentido esta distincion, y si la clausula de prevalencia deberia extenderse a los casos de choque entre titulos competenciales. La solucion que se apunta es afirmativa cuando el choque se produzca entre una norma basica en una materia y una norma autonomica dictada en otra materia distinta; aunque formalmente el titulo autonomico se califique como exclusivo.
Las declaraciones simbólicas de los municipios: entre la autonomía local, el postureo inocuo y el abuso
2020
El presente estudio aborda la legalidad de las declaraciones simbólicas municipales sobre cuestiones que no son propiamente de su competencia. En primer lugar, se presentan ejemplos de este tipo de declaraciones, y se aventuran algunas de las razones que las propician. En segundo lugar, se exponen y discuten los principales criterios utilizados por la jurisprudencia a fin de discernir cuándo una declaración simbólica resulta conforme con el ordenamiento jurídico y cuándo no. Finalmente, se ofrecen dos argumentos que invitan a embridar más decididamente la actividad declarativa de los municipios: la exigencia de neutralidad de la Administración, en relación con el principio de pluralismo y e…
Does shoe heel-to-toe drop have an influence on performance in downhill trail running?
2019
Trail running (TR) is characterized by sequences of uphill and downhill performed in a natural environment. Recently, studies investigated performance factors specific to TR. During a full race of ...
ICT – the new frontier? Pushing the boundaries of careers practice
2014
Much progress has been made in integrating information and communications technology ICT into careers practice, but there is still room for improvement. An international lens is adopted to examine some key elements that contribute to the successful integration of information communications technology (ICT) into careers practice. We start by exploring the role of policy, using the UK as a case study. Next, the perceptions that Finnish career practitioners have of ICT are reviewed using research findings into the different ways they think about social media and its purpose in career services. Finally, lessons learned from the design and integration of online services within career development…