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ITP Utrecht



Karla de Bruin: Bloody physics in forensics
In this talk, I will first give an overview of the work that is done at the NFI in general, and then more specific on bloodstain pattern analysis. Currently, at crime scenes the flight path of a blood drop is assumed to be a straight line. This neglection of gravity and air resistance may lead to an error of 45 cm in height estimation, which can be the difference between a sitting and standing position. In the Soft Matter Group at the UvA we use high speed imaging in order to study the blood drop's flight. For unambigous assignment of the trajectory to a bloodstain, four parameters have to be known: volume, impact velocity, impact angle, and impact position. Methods to extract the impact velocity from a dried bloodstain at a crime scene have been proposed before, but all of them were observer-dependent. We found a model for extraction of the impact velocity independent of the analyst, which can be used on various kinds of surfaces. With this method, future analysis on the crime scene will be more accurate, more objective and faster. This method will enable the difference between self-defence and murder.

Rembert Duine: Quantum linear-response theory and the fluctuation-dissipation theorem
Abstract: Following the course on classical linear-response theory and the fluctuation-dissipation theorem, I will discuss its quantum-mechanical version. As an application I consider electronic transport and Johnson-Nyquist noise, i.e., noise in the current of conductors. Various type of response functions (real-time, imaginary-time, advanced/retarded) and their relations are also discussed.

Appendix A from

Exercise 0.11 from:


Wouter Ellenbroek: Linear-response in classical theorem
Abstract: This course deals with what we can learn about classical systems by gently taking them out of their equilibrium state. After a brief reminder of the basics and a short treatment of brownian motion, the bulk of the course will be about linear response in classical statistical mechanics, including the fluctuation-dissipation theorem and Kramers-Kronig relations. At the end of the course I will briefly discuss the mechanical linear response of disordered materials that are not in thermal equilibrium, as a very different example of a situation where we can learn a lot about a system by studying its response to small perturbations.
The lecture notes for the larger part have been provided by Fred MacKintosh (VU Amsterdam) who taught a similar course here in 2011. For the end of the course I will use parts of a review paper that was used in the same year for the course on jamming taught by Brian Tighe (review by Martin van Hecke).
The course by Rembert Duine will expand on this course by treating Quantum linear response theory.

Handouts will be provided at the school as well.

Last update: 19-05-2017, 14.30