The brain has evolved to enable organisms to survive in a complicated and dynamic world. Its operation is based upon a priori models of the environment which are adapted, during learning, in response to new and changing stimuli. The same qualities that make biological learning mechanisms ideal...

The algebraic reconstruction technique (ART), based on the well known algorithm proposed by Kaczmarz in 1937, is one of the most important class of solution methods for image reconstruction problems. But unfortunately, almost all the methods from the ART class give satisfactory results only in...

Die Positronen-Emissions-Tomographie (PET) wird in Deutschland seit den 90er-Jahren zunehmend in der klinischen Diagnostik der Indikationsgebiete Onkologie, Kardiologie und Neurologie/Psychiatrie eingesetzt. Da die Anwendung der PET eine komplexe und teure Infrastruktur benötigt, gewinnen...

Three-dimensional velocity structure of the upper crust was determined by inversionof P-wave travel times in the region of Attiki Prefecture (Greece), located at the eastern part of the Greek mainland, which is traditionally considered as an area of low seismicity. An earthquake of Ms=5.9...

We discuss the application of synchrotron X-ray microtomography (XMT) to granular matter, foams, crumpled membranes, and paper. XMT provides rapid, high-resolution, fully three-dimensional characterization of each of these classes of material. In some cases, subsequent three-dimensional image...