3 resultados para Innovation System, Research Policy
em AMS Tesi di Laurea - Alm@DL - Università di Bologna
Resumo:
Confronto tra due software specifici per l'analisi di rischio nel trasporto stradale di merci pericolose (TRAT GIS 4.1 e QRAM 3.6) mediante applicazione a un caso di studio semplice e al caso reale di Casalecchio di Reno, comune della provincia di Bologna.
Resumo:
Reinforced concrete columns might fail because of buckling of the longitudinal reinforcing bar when exposed to earthquake motions. Depending on the hoop stiffness and the length-over-diameter ratio, the instability can be local (in between two subsequent hoops) or global (the buckling length comprises several hoop spacings). To get insight into the topic, an extensive literary research of 19 existing models has been carried out including different approaches and assumptions which yield different results. Finite element fiberanalysis was carried out to study the local buckling behavior with varying length-over-diameter and initial imperfection-over-diameter ratios. The comparison of the analytical results with some experimental results shows good agreement before the post buckling behavior undergoes large deformation. Furthermore, different global buckling analysis cases were run considering the influence of different parameters; for certain hoop stiffnesses and length-over-diameter ratios local buckling was encountered. A parametric study yields an adimensional critical stress in function of a stiffness ratio characterized by the reinforcement configuration. Colonne in cemento armato possono collassare per via dellinstabilit dellarmatura longitudinale se sottoposte allazione di un sisma. In funzione della rigidezza dei ferri trasversali e del rapporto lunghezza dinflessione-diametro, linstabilit pu essere locale (fra due staffe adiacenti) o globale (la lunghezza dinstabilit comprende alcune staffe). Per introdurre alla materia, proposta unesauriente ricerca bibliografica di 19 modelli esistenti che include approcci e ipotesi differenti che portano a risultati distinti. Tramite unanalisi a fibre e elementi finiti si studiata linstabilit locale con vari rapporti lunghezza dinflessione-diametro e imperfezione iniziale-diametro. Il confronto dei risultati analitici con quelli sperimentali mostra una buona coincidenza fino al raggiungimento di grandi spostamenti. Inoltre, il caso dinstabilit globale stato simulato valutando linfluenza di vari parametri; per certe configurazioni di rigidezza delle staffe e lunghezza dinflessione-diametro si hanno ottenuto casi di instabilit locale. Uno studio parametrico ha permesso di ottenere un carico critico adimensionale in funzione del rapporto di rigidezza dato dalle caratteristiche dellarmatura.
Resumo:
Our generation of computational scientists is living in an exciting time: not only do we get to pioneer important algorithms and computations, we also get to set standards on how computational research should be conducted and published. From Euclids reasoning and Galileos experiments, it took hundreds of years for the theoretical and experimental branches of science to develop standards for publication and peer review. Computational science, rightly regarded as the third branch, can walk the same road much faster. The success and credibility of science are anchored in the willingness of scientists to expose their ideas and results to independent testing and replication by other scientists. This requires the complete and open exchange of data, procedures and materials. The idea of a replication by other scientists in reference to computations is more commonly known as reproducible research. In this context the journal EAI Endorsed Transactions on Performance & Modeling, Simulation, Experimentation and Complex Systems had the exciting and original idea to make the scientist able to submit simultaneously the article and the computation materials (software, data, etc..) which has been used to produce the contents of the article. The goal of this procedure is to allow the scientific community to verify the content of the paper, reproducing it in the platform independently from the OS chosen, confirm or invalidate it and especially allow its reuse to reproduce new results. This procedure is therefore not helpful if there is no minimum methodological support. In fact, the raw data sets and the software are difficult to exploit without the logic that guided their use or their production. This led us to think that in addition to the data sets and the software, an additional element must be provided: the workflow that relies all of them.
