Events - Page 3

Time and place: Oct. 23, 2020 12:15 PM1:00 PM, Niels Henrik Abels hus, 9th floor, seminar room 919


Registration Link: 

Abstract: Frailty is a multi-system dysregulation leading to a loss of physiological reserve known to predict dementia. However, its link with neurodegenerative alterations of the central nervous system (CNS) is not well understood at present. We investigated the association between the biomechanical response of the CNS and frailty in older adults suspected of normal pressure hydrocephalus (NPH) presenting markers of multiple comorbid neurodegenerative pathologies, including pathologies of Alzheimer’s Disease. The biomechanical response of the CNS was characterized from phase contrast magnetic resonance imaging and intracranial pressure monitoring during a lumbar infusion test. Frailty was assessed with an index of health deficit accumulation. We found a significant association between the CNS biomechanical response and frailty, with an effect size comparable to that between frailty and age, the latter being the strongest known risk factor of frailty. The CNS biomechanical characterization may help to understand how frailty is related to neurodegeneration and detect the shift from normal to pathological brain ageing.

This talk is part of the Mechanics Lunch Seminar series. That means 20min talks plus discussion in an informal setting.

Time and place: Oct. 9, 2020 12:00 PM12:45 PM, Niels Henrik Abels hus, 9th floor, seminar room 919

I will present some of my work on the solid-electrolyte interface. There, so-called electric double layers (EDLs) can form that consist of electrons on the solid screened by a diffuse cloud of ions in the adjacent liquid. EDLs are of paramount importance to many processes in physical chemistry, soft matter and biophysics, as well as in EDL capacitors and modern "supercapacitors". My work on EDLs focused on their (out-of-equilibrium) formation through questions like: 'On what timescale does an electrolyte respond to an applied temperature or voltage difference?', 'How does the (local) temperature in an electrolyte react to an applied electric field?', and 'How is the EDL affected by a change in temperature or salt concentration?'. I will show how answers to these questions suggest new methods for harvesting sustainable energy, for instance, from the controlled mixing of seawater and river water.

This talk is part of the Mechanics Lunch Seminar series. That means 20min talks plus discussion in an informal setting.

Registration Link:


Time and place: Sep. 18, 2020 12:00 PM12:45 PM, Niels Henrik Abels hus, 9th floor, seminar room 919

DuMux  (short for "Dune for Multi- {Phase, Component, Scale, Physics,…} flow and transport in porous media") is  a free and open-source simulator for flow and transport processes in porous media. DuMux is modern C++ code based on the scientific software framework Dune (Distributed and Unified Numerics Environment) and has a focus on modularity and reusability. 

The main features and ideas behind DuMux will be introduced with several examples from recent research projects.

This talk is part of the Mechanics Lunch Seminar series. That means 20min talks plus discussion in an informal setting.

Registration Link:


Time and place: Aug. 30, 2019Aug. 31, 2019, Tøyen hovedgård

The scope of the workshop: This international workshop brings together scientist from a wide range of fields with a special interest in bio-mechanics phenomena from cellular scale to the size of organs. Through a series of short talks the participants will present their work, where the workshop strives to stimulate scientific exchange and to initiate new collaborations.

Time and place: Aug. 9, 2018 11:15 AM12:00 PM, NHA 919

Christophe Henry

Post doc at Observatoire de la Cote d'Azur, Laboratoire Lagrange

Time and place: Feb. 14, 2018 3:15 PM4:00 PM, End of the line, Ullevål Stadion

Soft and Wet is Different

Time and place: Jan. 9, 2018 1:15 PM2:00 PM, Ullevål End of the Line

Emerging instabilities and bifurcations from deformable fluid interfaces in the inertialess regime 

In this talk, I will present two studies regarding the dynamics of droplets in the creeping flow, focusing on the arising instability and bifurcation phenomena. The first work investigates a buoyancy-driven droplet translating in a quiescent environment and the second a particle-encapsulating droplet in shear flow. There-dimensional simulations based on versatile boundary integral methods were employed to explore the intriguing instability and bifurcation phenomena in the inertialess flow. In the first work, a non-modal stability analysis was performed to predict the critical condition of instability; and in the second, a dynamic system approach was adopted to model and characterize the interacting bifurcations.

Time: Nov. 24, 2017 11:30 AM12:00 PM

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.

Time: Nov. 24, 2017 11:00 AM11:30 AM

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.

Time and place: Nov. 2, 2017 10:15 AM11:00 AM, Gates of Eden

When and how surface structure determines the dynamics of partial wetting  

Time and place: Oct. 30, 2017 3:15 PM4:00 PM, Hurricane

Sedimentation-diffusion equilibrium of Quincke rollers  

Time and place: Oct. 27, 2017 1:00 PM2:00 PM, hurricane

Iceberg drift on dead water

Time and place: Oct. 20, 2017 11:15 AM12:00 PM, Hurricane

Reyna Ramirez

Time and place: Sep. 15, 2017 11:15 AM12:00 PM, Hurricane
Time and place: May 12, 2017 11:15 AM12:00 PM, NHA bygget 9 etg B91

Study of the air-flow very close to the surface of wind-generated water waves Marseille large air-water facility

Time and place: Apr. 28, 2017 11:15 AM12:00 PM, NHA bygget 9 etg B91

Activity at IFE Wind Energy: numerical modeling of offshore wind turbines

IFE (Institutt for Energiteknikk) is a research center located in Kjeller. The wind group at IFE mainly works with the development and analysis of new cost effective concepts for offshore wind energy, both concerning innovative rotor designs and new concepts for substructures. The group main investigation tool is the in-house software 3DFloat, an aero-elastic code which can simulate the whole wind turbine structure when exposed to the associated environmental loads (wind loads, hydrodynamic loads, soil loads if bottom-fixed).

In the presentation, an insight into the wave kinematics and wave loads modeling tools that are currently included in 3DFloat will be provided.

Time and place: Apr. 21, 2017 11:15 AM12:00 PM, NHA bygget 9 etg B91

Bioprocessing of marine and agricultural by-products

Time and place: Mar. 10, 2017 11:15 AM12:00 PM, NHA 935

Large Eddy Simulation of the interaction of water waves with turbulent air flow

Time and place: Mar. 2, 2017 11:15 AM12:00 PM, 801
Time and place: Feb. 13, 2017 2:00 PM3:00 PM, NHA 935
Time and place: Jan. 9, 2017 8:30 AMJan. 10, 2017 5:00 PM, The Norwegian Academy of Science and Letters

The symposium is a follow-up of four highly successful previous symposia, held 14-15 October 2008 in the Norwegian Academy in Oslo, 1-2 November 2010 in RSE in Edinburgh, 2013 Oslo and 2015 Edinburgh.  Topics of this year's symposium include: internal waves, waves and ice, freak waves and wave-structure interaction as well as related aspects of stratified and buoyancy-driven oceanic flows. 

The scope of the programme will reflect the ongoing wave research projects in Norway and Scotland individually and in collaboration and it will include a special session celebrating the 6oth birthday of John Grue, the co-Director of the DNVA-RSE Waves symposia since their inception.



Time and place: Dec. 2, 2016 11:15 AM12:00 PM, NHA bygget 9 etg B91

Stereolithography - A Powerful Tool to Create almost Everything

Stereolithography or "SLA" printing is a powerful and widely used 3D printing technology for creating prototypes, models, and fully functional parts for production. This additive manufacturing process works by focusing an ultraviolet (UV) laser onto a vat of liquid resin. Layer by layer formation of a polymeric network allows printing parts that are almost impossible to create with other processes.At Formlabs, a startup that originated out of the MIT Media lab in 2011, we work on all aspects of SLA printing; we develop and manufacture 3D printers, resins, and software. In this talk, I will give a detailed overview of the printer technology, the chemistry of the materials, and how to use SLA for lots of exciting applications.


Time and place: Nov. 4, 2016 11:15 AM12:00 PM, NHA 935

Microfluidics of sugar transport in plants

Plants can rightly be called masters of microengineering. Their survival and successful reproduction depends on their ability to overcome a series of physical challenges during growth and when transporting matter over great distances. In this talk, we focus on the microfluidic network responsible for energy distribution (the phloem). We combine experiments on living plants and biomimetic microfluidic devices to elucidate the basic physical principles that govern sugar transport in plants. We derive a scaling relation between the characteristic sizes of the plant organs, which optimizes the rate of sugar transport. Comparison with experimental data suggests that the pipe network is operating at or near the theoretical optimum. We further consider the coupling between photosynthesis and long-distance transport. While sap with high sugar concentration has the greatest transport potential, viscosity impedes flow, a phenomena analogous to congestion in traffic flows. The optimal sugar concentration for transport in plants is 25%, sweeter than Coke (10%) but much less viscous than maple syrup (65%). Although plants have generally evolved towards the theoretical optimum, a number of unusually sweet plants exist. This group consists primarily of crop plants such as corn (40%) and potato (50%), sugar junkies of the natural world.

Time and place: Oct. 14, 2016 11:15 AM12:00 PM, NHA bygget 9 etg B91

Digital signalbehandling og bildeanalyse, UiO and PGS

The effects of moving rough sea surfaces on seismic data.

Time and place: Sep. 30, 2016 11:15 AM12:00 PM, B91, NHA bygget

Enrico Fermi and the birth of modern nonlinear physics

In the early fifties in Los Alamos E. Fermi in collaboration with J. Pasta and S. Ulam investigated a one dimensional chain of equal masses connected by a weakly nonlinear spring. The key question was related to the understanding of the phenomenon of conduction in solids; in particular they wanted to estimate the time needed to reach a statistical equilibrium state characterized by the equipartition of energy among the Fourier modes. They approached the problem numerically using the MANIAC I computer; however, the system did not thermailize and  they observed a recurrence to the initial state (this is known as the FPU-recurrence). This unexpected result has led to the development of the modern nonlinear physics (discovery of solitons and integrability). In this seminar, I will give an historical overview of the subject and present the different approaches that have been proposed in the last 60 years for explaining this paradox. Very recent results on the estimation of the time scale and on  the explanation of the mechanism of equipartition will also be discussed.