Plasma plays an important role in laser fusion research. High power laser is used to drive the re... more Plasma plays an important role in laser fusion research. High power laser is used to drive the reaction. Hence the laser turns to become very crucial devices to form plasma. Generation of plasma can be done by various focusing techniques. Therefore the aim of this project is to determine the best focusing techniques in order to produce strong plasma. Two focusing techniques were considered, that are a single lens technique, and combination lenses technique. A high-speed photographic system was developed in conjunction with image processing system to visualize and record the plasma activities in the focus region. An electrical spark was observed at the focal region which indicates the existence of an optical breakdown. The results shown that the maximum plasma width was obtained correspond to the peak power of 22.21 MW using a combination lenses technique. In general, combination lenses technique produces more consistent plasma, although it size is small. A single lens technique induced large plasma but associated with turbulence condition as indicated by blurred image.
Medical Image Computing and Computer-Assisted Intervention���MICCAI 2006, 2006
Abstract. A new approach to align an image of a medical object with a given prototype is proposed... more Abstract. A new approach to align an image of a medical object with a given prototype is proposed. Visual appearance of the images, after equalizing their signals, is modelled with a new Markov-Gibbs random field with pairwise interaction model. Similarity to the prototype is measured by a Gibbs energy of signal co-occurrences in a characteristic subset of pixel pairs derived automatically from the prototype. An object is aligned by an affine transformation maximizing the similarity by using an automatic initialization followed by ...
Plasma plays an important role in laser fusion research. High power laser is used to drive the re... more Plasma plays an important role in laser fusion research. High power laser is used to drive the reaction. Hence the laser turns to become very crucial devices to form plasma. Generation of plasma can be done by various focusing techniques. Therefore the aim of this project is to determine the best focusing techniques in order to produce strong plasma. Two focusing techniques were considered, that are a single lens technique, and combination lenses technique. A high-speed photographic system was developed in conjunction with image processing system to visualize and record the plasma activities in the focus region. An electrical spark was observed at the focal region which indicates the existence of an optical breakdown. The results shown that the maximum plasma width was obtained correspond to the peak power of 22.21 MW using a combination lenses technique. In general, combination lenses technique produces more consistent plasma, although it size is small. A single lens technique induced large plasma but associated with turbulence condition as indicated by blurred image.
Medical Image Computing and Computer-Assisted Intervention���MICCAI 2006, 2006
Abstract. A new approach to align an image of a medical object with a given prototype is proposed... more Abstract. A new approach to align an image of a medical object with a given prototype is proposed. Visual appearance of the images, after equalizing their signals, is modelled with a new Markov-Gibbs random field with pairwise interaction model. Similarity to the prototype is measured by a Gibbs energy of signal co-occurrences in a characteristic subset of pixel pairs derived automatically from the prototype. An object is aligned by an affine transformation maximizing the similarity by using an automatic initialization followed by ...
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Papers by Ahmad Ali