120 research outputs found
Afrondende studies geocontaineronderzoek (Final studies geocontainer research)
No full textResearch on the behaviour of geocontainers and other geosystems has been performed in the framework of the WIS-project "Knowledge development Geo-sand elements" and the Delft Cluster project "Construction of large scale sand bodies". Model tests have been performed in several model facilities of WL½Delft Hydraulics and GeoDelft. Field measurements have been performed in and around geocontainers dumped into the Kandiadam. Existing theories have been verified and new ones haven been developed. The results of the main studies have been reported in other reports of this series: DC1-321-3,4,5,6 & 7. The results of 4 studies on special aspects, which appeared to be relevant during the reporting of the main studies, have been reported here. All results, including the ones reported here, have been summarised in report DC1-321-11. The special aspects include: The influence of obliqueness of a geocontainer at the moment it falls out of the splitbarge, on its horizontal displacement during the dumping process The influence of the specific mass of a geocontainer on its horizontal displacement during the dumping process The influence of the wave induced outward pressure head difference over the upper layer of geocontainers in the seaward slope of a heap of geocontainers on the sliding stability of the outer layer of geocontainers The process of falling out of the splitbarge during the opening of the splitbarge, as observed during the dumping of a geocontainer in the Kandiada
Betrouwbaarheid van trillingspredicties
No full textIn de eerste tranche van Delft Cluster (DC1) is een uitgebreid onderzoek gedaan naar de betrouwbaarheid van trillingsvoorspellingen. Dit heeft inzicht opgeleverd over de betrouwbaarheid van modellen, de onzekerheid over invoerparameters, de rol van modelleerder en de stochastiek van de praktijk. In dit werkpakket is een poging gedaan deze kennis toe te passen op de huidige voorspellingsmethoden en de onzekerheden rond prognoses hanteerbaar te maken voor onderzoeker en opdrachtgever. Na bestudering van de resultaten van DC1 bleek dat de resultaten niet goed te vertalen zijn naar direct hanteerbare richtlijnen bij de huidige voorspellingsmethoden. In dit rapport staat een verslag van het onderzoek naar de toepasbaarheid van de kennis van DC1 en enkele alternatieve benaderingswijzen. In hoofdstuk 2 is een samenvatting gegeven van de resultaten van DC1. In hoofdstuk 3 wordt de hypothese beoordeeld of er een relatie bestaat tussen de betrouwbaarheid van een voorspelling en de ervaring van de modelleur. In hoofdstuk 4 staat de aanpak beschreven die bij het opstellen van het werkplan was voorzien en een voorstel voor een gewijzigde aanpak
Distributional chaos for operators on Banach spaces
No full text[EN] Four notions of distributional chaos, namely DC1, DC2, DC21/2 and DC3, are studied within the framework of operators on Banach spaces.. It is known that, for general dynamical systems, DC1 subset of DC2 subset of DC21/2 subset of DC3. We show that DC1 and DC2 coincide in our context, which answers a natural question. In contrast, there exist DC21/2 operators which are not DC2. Under the condition that there exists a dense set X-0 subset of X such that T(n)x -> 0 for any x is an element of X-0, DC3 operators are shown to be DC1. Moreover, we prove that any upper-frequently hypercyclic operator is DC21/2. Finally, several examples are provided to distinguish between different notions of distributional chaos, Li-Yorke chaos and irregularity. (C) 2017 Elsevier Inc. All rights reserved.This work was partially done on a visit of the first author to the Departament de Matematica Aplicada at Universitat Politecnica de Valencia (Spain), and he is very grateful for the hospitality. The first author was supported by CNPq (Brazil) and by the EBW + Project (Erasmus Mundus Programme). The second and the third authors were supported by MINECO, Projects MTM2013-47093-P and MTM2016-75963-P, and by Generalitat Valenciana, Projects PROMETEOII/2013/013 and PROMETEO/2017/102. The fourth author was supported by the scientific research starting project of Southwest Petroleum University (No. 2015QHZ029) and the National Natural Science Foundation of China (No. 11601449). We thank the referee whose suggestions produced an improvement in the presentation of the paper.Bernardes, NC.; Bonilla, A.; Peris Manguillot, A.; Wu, X. (2018). Distributional chaos for operators on Banach spaces. Journal of Mathematical Analysis and Applications. 459(2):797-821. https://doi.org/10.1016/j.jmaa.2017.11.005S797821459
The Current Deflecting Wall: Mitigating harbour siltation; Set-up and integration of physical and numerical modelling techniques
No full text- …
