1,942 research outputs found
Highly Stable Multivalue Almost Collocation Methods with Structured Coefficient Matrix
No full textOur aim is to solve systems of ordinary differential equations potentially candidate to be stiff, so developed methods must have high stability properties and uniform order of convergence. We focus our attention on multivalue methods [1], which are a generalization of classical methods, such as multistep and Runge-Kutta methods, and we extend the solution smoothly by approximating them though a collocation polynomial. These methods require at each time-step the solution of a non linear system of internal stages, so the computational effort is strictly connected to the nature of this system. We are interested in the construction of methods that allow a reduction of this computational cost, so we propose methods with full matrix [6] and structured matrix (triangular [2], singly triangular [3, 4], diagonal [5]). In the case of structured matrix, we perform almost collocation since it is not possible to impose
all the collocation conditions. We compare these methods calculating the error in the final step point and the experimental order of convergence.
References
[1] J.C. Butcher, General linear methods. Computers & Mathematics with Applications. 31 (4-5): 105-112. doi:10.1016/0898-1221(95)00222-7 (1996).
[2] D. Conte, R. D'Amborsio, M.P. D'Arienzo, B. Paternoster, Highly stable multivalue collocation methods, J. Phys.: Conf. Ser. 1564, 012012 (2020).
[3] D. Conte, R. D'Ambrosio, M.P. D'Arienzo, B. Paternoster, Singly diagonally implicit multivalue collocation methods, in 2020 International Conference on Mathematics and Computers in Science and Engineering (MACISE), Madrid, Spain, DOI:10.1109/MACISE49704.2020.00018, pp. 65-68 (2020).
[4] D. Conte, R. D'Amborsio, M.P. D'Arienzo, B. Paternoster, One-point spectrum Nordsieck almost collocation methods, International Journal of Circuits, Systems and Signal Processing, vol. 14, pag. 266-275, DOI: 10.46300/9106.2020.14.38 (2020).
[5] D. Conte, R. D'Amborsio, M.P. D'Arienzo, B. Paternoster, Multivalue almost collocation methods with diagonal coecient matrix, Lecture Notes in Comput. Sci., in press.
[6] R. D'Ambrosio, B. Paternoster, Multivalue collocation methods free from order reduction,J. Comput. Appl. Math. DOI: 10.1016/j.cam.2019.112515 (2019)
Dove nuotano i caprioli. Acque, memorie, tralicci e r-esistenze in Cadore. Con DVD video
No full textL’acqua del Cadore racconta una molteplicità di storie: ha ispirato antichissimi culti e leggende popolari, plasmando nel tempo forme del paesaggio, vita delle comunità ed economie della zona. Tra queste, dalla metà del Novecento diventa dominante quella dell’industria idroelettrica: il sacrificio del Piave-Boite-Vajont si rende necessario alla modernizzazione del Paese, secondo un progetto che si rivelerà insieme strategico e drammatico.
Il documentario raccoglie le memorie del piccolo borgo di Vallesella, che nei primi anni Cinquanta a seguito della realizzazione dell’invaso di Centro Cadore va sgretolandosi fisicamente e simbolicamente. Il racconto, costruito in maniera corale, allarga lo sguardo e la scala di osservazione dalle vicende passate agli usi e percezioni attuali del paesaggio idroelettrico, suggerendo una riflessione sul senso dei luoghi, sul valore polisemico dell’acqua, sui destini della montagna del presente e del futuro
Seismic fragility of multistorey R/C frames with vertical irregularities
No full textStructural regularity represents one of the most important principles governing the conceptual
design of seismic structures, but it is also one of the most common structural deficiency
observed in both existing and new buildings. Experiences of past earthquakes have shown
that buildings with irregular configurations or asymmetrical distributions of structural
properties trigger an increase in seismic demand, causing greater damage due to the
concentrated deformations induced by structural discontinuities. The aim of this research is
focused on the seismic behaviour of multistorey R/C plane frames with in-height
irregularities. Regular models are developed and the irregularity has been introduced by
degrading and upgrading the ‘stiffness-storey’ and considering different distributions of soft
or stiff stories along the height of the structures. The seismic performance of irregular plane
frames has been studied by means of Incremental Dynamic Analysis (IDA), the analysis have
been performed in Opensees. The study allowed a critical evaluation of the effect of vertical
irregularities in terms of seismic response
O agir adolescente e suas ressonâncias grupais
No full textSous la direction de Deise Matos do Amparo, Sandra Francesca Conte de Almeida, Katia Tarouquella R. Brasil, Maria Inês Gandolfo Conceição, François Marty
Polycrystalline diamond x-ray sensors: Intensity and field dependent response
No full textX-ray photoconductive sensors based on high quality polycrystalline diamond were implemented and their response was measured as a function of the incident intensity, at different applied voltage in the range 0-100 V. At each beam intensity, the sensor current increases linearly with applied voltage up to about 50 V, then the increase slows toward a saturation. The sensor responsivity R is independent of the beam intensity Phi only at low applied bias, whereas it decreases according to R~Phi-1/2 at higher intensities The turning point between these regimes moves at lower radiation intensity for increasing the applied voltage V. Such behavior has been interpreted in terms of different processes dominating the carrier recombination kinetics when the x-ray beam intensity changes over three orders of magnitude
Pinacoteca della R. Accademia di belle arti in Milano.
No full textFrom the library of Conte Antonio Cavagna Sangiuliani di Gualdana.Includes alphabetical author index.Mode of access: Internet
Resonance assignment for the N-terminal region of the eukaryotic initiation factor 5 (eIF5)
No full textCaratterizzazione tecnologica di un nuovo prototipo di inalatore multidose per polveri (MDPI)
No full textInfluence of inspiratory flow rate and storage conditions on dosage precision and disaggregation efficiency of a new multidose dry powder inhaler.
No full textAtti di congresso pubblicati su rivist
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