Drift wave maps, area preserving maps that describe the motion of charged particles in drift waves, are derived. The maps allow the integration of particle orbits on the long time scale needed to describe transport. Calculations using the drift wave maps show that dramatic improvement in the particle confinement, in the presence of a given level and spectrum of E3B turbulence, can occur for q(r...

This thesis is an investigation of the behaviour of radial progenitors in the hindbrain of the teleost fish Danio rerio, the zebrafish, during embryonic neurogenesis. These progenitors have many of the characteristics of radial glial cells described in other systems. Recent studies from several laboratories worldwide have shown that radial glia play an important role in the patterning and neuro...

In this study, we investigate the changes in users' mental representations of a topic during their exploratory search on the Web. We use concept maps to compare the users’ knowledge before and after a search. Participants are required to gather information on the Web as preparation for a regular feature of a magazine on environment and trip topics. They are divided into two scenario groups: div...

We present synthetic Doppler maps of gaseous flows in semidetached binaries based on the results of 3D gas dynamical simulations. Using of gas dynamical calculations alongside with Doppler tomography technique permits to identify main features of the flow on the Doppler maps without solution of ill-posed inverse problem. Comparison of synthetic tomograms with observations makes possible both to...

Iterative reconstruction is a relatively new concept for the calculation of medical images, which is based on formulating the reconstruction process mathematically as an inverse problem and solving it with a numerical optimization method. Driven by recent success for dose reduction in CT, iterative reconstruction is currently receiving strong interest also in the MRI community. The first part o...

Quarry blasts can be effective, low-cost energy sources for seismic imaging, provided that one can deconvolve the extended source signatures produced by ripple firing. This study uses real and synthetic quarry-blast data to compare the performance of several methods for deconvolving mixed-delay signals. The problem considered here is the recovery of the effective source function along a given a...