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Many scientific disciplines ranging from physics, chemistry and biology to material sciences, geophysics and medical diagnostics need a powerful X-ray source with pulse lengths in the femtosecond range 1-4. This would allow, for example, time-resolved observation of chemical reactions with atomic resolution. Such radiation of extreme intensity, and tunable(More)
Experimental results are presented from vacuum-ultraviolet free-electron laser (FEL) operating in the self-amplified spontaneous emission (SASE) mode. The generation of ultrashort radiation pulses became possible due to specific tailoring of the bunch charge distribution. A complete characterization of the linear and nonlinear modes of the SASE FEL(More)
Modeling electromagnetic (EM) fields and their interaction with a complex environment is important for developing safe and effective wireless systems. Methods for electromagnetic modeling are com-putationally intensive, and even small scenario can have long run times. Developments in graphics processing units (GPUs) over the past decade have created an(More)
—The application of evolutionary algorithms to the optimization of sensor allocation given different target configurations requires the tuning of parameters affecting the robustness and run time of the algorithm. In this context, parameter settings in evolutionary algorithms are usually set through empirical testing or rules of thumb that do not always(More)
Maritime Domain Awareness (MDA) requires the ability to accurately identify, track, and understand the rationale of the behavior of vessels given the surrounding contextual environment. Reasoning about such behaviors can ultimately lead to a better understanding of whether the behaviors are normal or anomalous. In order to adequately improve the quality and(More)
The current-induced motion of magnetic domain walls (DWs) confined to nanostructures is of great interest for fundamental studies as well as for technological applications in spintronic devices. Here, we present magnetic images showing the depinning properties of pulse-current-driven domain walls in well-shaped Permalloy nanowires obtained using(More)
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