510 research outputs found
A Simulation Platform for Localization and Mapping
Abstract: In this paper we present a simulation platform for evaluate methods for simultaneous location and mapping. The platform is based on The Kalmtool 3 toolbox which is a set of MATLAB tools for state estimation for nonlinear systems. The toolbox contains functions for extended Kalman filtering as well as for two new filters called the DD1 filter and the DD2 filter. It also contains function for Uncented Kalman filters as well as three versions of particle filters. The toolbox requires MATLAB ver. 6, but no additional toolboxes are required. Copyright c ○ IFAC 2006
Full-field hard x-ray microscopy with interdigitated silicon lenses
Full-field x-ray microscopy using x-ray objectives has become a mainstay of
the biological and materials sciences. However, the inefficiency of existing
objectives at x-ray energies above 15 keV has limited the technique to weakly
absorbing or two-dimensional (2D) samples. Here, we show that significant gains
in numerical aperture and spatial resolution may be possible at hard x-ray
energies by using silicon-based optics comprising 'interdigitated' refractive
silicon lenslets that alternate their focus between the horizontal and vertical
directions. By capitalizing on the nano-manufacturing processes available to
silicon, we show that it is possible to overcome the inherent inefficiencies of
silicon-based optics and interdigitated geometries. As a proof-of-concept of
Si-based interdigitated objectives, we demonstrate a prototype interdigitated
lens with a resolution of ~255 nm at 17 keV.Comment: 10 pages, 5 figure. Submitted to Applied Physics Letters 31st March
2015, rejected 17th June 201
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