in this paper, a new online robot motion planner is developed for systematically exploring unknown environâ¬ments by intelligent mobile robots in real-time applications. the algorithm takes advantage of sensory data to find an obstacle-free start-to-goal path. it does so by online calculation of the generalized voronoi graph (gvg) of the free space, and utilizing a combination of depth-first an...

fe49co33ni18 nanowire arrays (175 nm in diameter and lengths ranging from 5 to 32μm) were fabricated into nanopores of hard-anodized aluminum oxide templates using pulsed ac electrodeposition technique. hysteresis loop measurements indicated that increasing the length decreases coercivity and squareness values (from 274 oe and 0.58 to200 oe and 0.105, respectively), indicating the increase in m...

information in particular can benefit from appropriate visualisation. Authors like Benedict (1991) and Wexelblat (1991) offer an analytical foundation for the visualisation of abstract data. One particular area of application is software visualisation, in which more graphical ways of communicating information about the structure and behaviour of computer programs are sought (Price et al 1993). ...

The sign cancellation between scattering amplitudes makes fermions different from bosons. We systematically investigate Feynman diagrams' fermionic structure in a representative many-fermion system---a uniform Fermi gas with Yukawa interaction. analyze the role of crossing symmetry and global gauge cancellation. arguments are then used to identify sign-canceled groups diagrams. Sign-structure a...