Evaluation of a collaborative photography workshop using the iPad 2 as an accessible technology for participants who are blind, visually impaired and sighted working collaboratively

A workshop using iPads to train photographers who are blind, visually impaired and sighted is evaluated using a model of inclusive technical capital. It was hypothesized that all participants would find iPad apps accessible. It was found that iPads were good introductory devices, but experienced participants who are blind and sighted still preferred specialized cameras

VVV High Proper Motion Survey

Here we present survey of proper motion stars towards the Galactic Bulge and an adjacent plane region base on VISTA-VVV data. The searching method based on cross-matching photometric Ks-band CASU catalogs. The most interesting discoveries are shown.Peer reviewe

Evaluation of a collaborative photography workshop using the iPad 2 as an accessible technology for participants who are blind, visually impaired and sighted working collaboratively

A workshop using iPads to train photographers who are blind, visually impaired and sighted is evaluated using a model of inclusive technical capital. It was hypothesized that all participants would find iPad apps accessible. It was found that iPads were good introductory devices, but experienced participants who are blind and sighted still preferred specialized cameras

Design of Reconfigurable Array Antennas With Minimum Variation of Active Impedances

[Abstract] In this letter, the authors propose an optimization method based on the genetic algorithm (GA) to reconfigure a linear array of vertical half-wavelength dipole antennas to generate two patterns with minimum active impedance variation when the antenna switches from one pattern to other in the presence or absence of a ground plane behind the array. The problem is to find a fixed voltage amplitude distribution that generates two broadside symmetrical beams in the horizontal plane: a pencil beam with zero phases and a flat-top beam with phases in the range from -180deg to +180deg. Mutual coupling effect is taken into account via open circuit mutual impedance matri

Lie theory of finite simple groups and the Roth property

AbstractIn noncommutative geometry a ‘Lie algebra’ or bidirectional bicovariant differential calculus on a finite group is provided by a choice of an ad-stable generating subset $\mathcal{C}$ stable under inversion. We study the associated Killing form K. For the universal calculus associated to $\mathcal{C}$ = G \ {e} we show that the magnitude $\mu=\sum_{a,b\in\mathcal{C}}(K^{-1})_{a,b}$ of the Killing form is defined for all finite groups (even when K is not invertible) and that a finite group is Roth, meaning its conjugation representation contains every irreducible, iff μ ≠ 1/(N − 1) where N is the number of conjugacy classes. We show further that the Killing form is invertible in the Roth case, and that the Killing form restricted to the (N − 1)-dimensional subspace of invariant vectors is invertible iff the finite group is an almost-Roth group (meaning its conjugation representation has at most one missing irreducible). It is known [9, 10] that most nonabelian finite simple groups are Roth and that all are almost Roth. At the other extreme from the universal calculus we prove that the 2-cycles conjugacy class in any Sn has invertible Killing form, and the same for the generating conjugacy classes in the case of the dihedral groups D2n with n odd. We verify invertibility of the Killing forms of all real conjugacy classes in all nonabelian finite simple groups to order 75,000, by computer, and we conjecture this to extend to all nonabelian finite simple groups.</jats:p