Een maat voor de vorm van een vervuilingspluim in de aardbodem. An indicator for the shape of a contamination plume in the earth's subsurface

Irisidentificatiesystemen

Irisidentificatiesystemen zijn veelbelovende en betrouwbare biometrische systemen die al op sommige plaatsen in gebruik zijn genomen. Een methode voor het identificeren van personen aan de hand van hun irispatronen is gepatenteerd door John Daugman van Cambridge University. In dit project worden de iris, het irisidentificatiesysteem van John...

On the assessment of scientific research

At universities there is a need to measure the quality of academic achievements in order to distribute available funds in a fair and objective manner. This happens based on the scientific journals in which the several departments publish. These, at their turn, are being judged on the number of citations an average article receives. However,...

Minimaliseren van kosten van dijkverhoging

In 1953 vond in Nederland de watersnoodramp plaats. Als gevolg daarvan werd de Deltacommissie ingesteld. Haar doel was om de overheid te adviseren welke maatregelen getroffen moesten worden zodat een tweede ramp voorkomen werd. De adviezen van de Deltacommissie hebben bijvoorbeeld geresulteerd in de afsluiting van de Nieuwe IJssel, de...

Random Polymers: Interaction with a Penetrable Surface

We introduce a polymer measure to describe a polymer that is attracted to the origin and repelled by the negative half-plane. We work out a direct expression for the partition function and look at properties of the free energy. We look at the model when repellance becomes attraction and when the repellance occurs in a random fashion. We prove...

Periodicity and a problem of powers a p-adic perspective

We investigate an old number-theoretical problem by Mahler. Using beta-expansions and p-adic valuations we obtain some new results. An important extension on a theorem on periodicity concerning expansions with algebraic base is proven.

I. The Four Gap Theorem and II. Differences of random Cantor sets

This thesis consists of two parts, which are separate with respect to content. The first part considers a subject in the field of number theory, while in the second part a subject from probability theory is studied. The first part of this thesis deals with a variation on the Three Gap Theorem. The Three Gap Theorem states that the fractional...