Arrangementer

Kommende 5 dager

i dag nov.
Tid: 24. nov. 2017 11:00 - 11:30

Elisabeth Seland

In my job as research adviser, I receive a lot of questions about rights, possibilities and problems in connection with scientific publishing and open access. Both EU and the Norwegian Research Council have rules about this, and there is also a UiO policy in place that is relevant for all employees. I will give a short presentation to try to clear up what you have to, must, may, could and should related to Open access. In my experience many of you have the same questions about these issues, so I hope you bring your questions with you and we can address them in the seminar.

Tid: 24. nov. 2017 11:30 - 12:00

Andreas Carlson og Jean Rabault

Nature has invented ingenious aerodynamic design solutions, some of which are critical for plants as wind dispersal of seeds and fruits is coupled to their flight performance. This formulates into an optimization problem for plants: large seed wings can lead to increased lift and more efficient dispersion, but are costly for the tree to build and can more easily be trapped in the canopy. Double winged seeds/fruits separate from their tree when a specific level of dessication is reached, and autorotate as they descend to the ground. This leads to the question: how is the wing curvature of seeds/fruits linked to their flight performance? To answer this, we develop a theoretical model that suggests the existence of an optimal wing curvature that yields maximal lift. To further understand the interplay between the flow and the wing geometry, we perform a synthetic seed adaptation by deploying 3D printing of double winged fruits that we use in flight experiments, where we span the phase space of aerial dynamics by changing the of wing curvature and seed/fruit weight. Experiments confirm that there is a sweet-spot in curvature to maximise the flight time consisted with geometrical measurements from a wide range of seeds in Nature. Our results highlights the importance of not curving too much or too little for helicopter fruits to have an optimal flight performance.

Tid og sted: 24. nov. 2017 13:15, Ullevål Stadion: Gates of Eden

M.Sc. Espen Stokkereit ved Matematisk institutt vil forsvare sin avhandling for graden ph.d.:

Essays on Stochastic Optimal Stopping and Control

 

Flere kommende arrangementer

Tid og sted: 30. nov. 2017 14:30 - 15:30, Gates of Eden, Sognsv. 77B

Abstract

NB! Coffee/Tea/Biscuits from 14.00.

Tid og sted: 4. des. 2017 09:00 - 8. des. 2017 12:00, Room 108, N.H. Abel's House

Information is available here.

Tid og sted: 11. jan. 2018 15:00 - 17:00, PRIO, Hausmannsgate 3, Oslo

This seminar is a part of the UiO-PRIO collaborative effort Oslo Lectures on Peace and Conflict