Oude Kerk Delft – The Bourdon bell and the skewed tower

15-11-2016 - The first parish church of Delft, the old church, was built around 1200. In front of the church a 75 meters high tower, with brickwork spire and four turrets, was built in 1350. Even during its construction, the tower was plagued by subsidence. This could be because the water in the Oude Delft had toView problem details

Demis – Zoning problem in determining environmental impacts of traffic

- Introduction Traffic has impacts on the environment. Traffic models are normally used to calculate the traffic intensities on the road network. The calculated traffic intensities form the basis for calculating the environmental impacts. In the impact assessment the traffic intensities are are converted to width of the zone that has negative impacts of the traffic.View problem details

X-flow – Leakage Detection Method

- For the purification of water hollow fiber membranes are increasingly being used. These are porous reeds with a diameter of between 1 to 2 mm, made by a particular type of plastic. The ‘wall’ of these reeds has a fine porous structure that is permeable for water, but not for particles of a certain sizes.View problem details

AOT – ADR option trading

- Problem The problem AOT presents is that of ADR-option pricing. In the brief outline below the problem and its setting is described. In the final presentation of the problem a brief introduction to options and option pricing will be given, such that the jargon will be clear. ADRs As a stock and derivative trading firmView problem details

Rekenkamer – Is there a financial life after an error?

- In many cases accountants make their judgment on a financial report based on samples taking at random. An approval is issued when the data in the report satisfies a given reliability interval (often a reliability of 95% is used), i.e., the errors found in the samples is not exceeding a certain critical value. In realityView problem details

Twaron – The rotor spinning process for fibre production

- At Teijin Twaron in Arnhem new ways of producing fibres are being developed. One of the interesting new techniques is “The Rotor Spinning Process”. In principle, this process looks a lot like the making of sugarfloss (or cotton candy) at the carnival / fair. Here, however, we deal with a polymer-filled disc with tiny holes.View problem details