9,652 research outputs found
Exploring miscommunication and collaborative behaviour in human-robot interaction
This paper presents the first step in designing a speech-enabled robot that is capable of natural management of miscommunication. It describes the methods
and results of two WOz studies, in which
dyads of naĂŻve participants interacted in a
collaborative task. The first WOz study
explored human miscommunication
management. The second study investigated
how shared visual space and monitoring
shape the processes of feedback and communication in task-oriented interactions.
The results provide insights for the development of human-inspired and
robust natural language interfaces in robots
Revitalizing African Libraries: The Challenge of a Quiet Crisis
Explores issues of literacy, information technology, and access to global knowledge as they relate to African public and university libraries. Highlights the need to develop partnerships between donors and African leaders
Coherent view of crystal chemistry and ab initio analyses of Pb(II) and Bi(III) Lone Pair in square planar coordination
The stereochemistry of 6s2 (E) lone pair of divalent Pb and trivalent Bi
(PbII and BiIII designated by M*) in structurally related PbO, PbFX (X= Cl, Br,
I), BiOX (X= F, Cl, Br, I) and Bi2NbO5F is rationalized. The lone pair LP
presence determined by its sphere of influence E, equal to those of oxygen or
fluorine anions, was settled by its center then giving M*-E directions and
distances. Detailed description of structural features of both elements in the
title compounds characterized by [PbEO]n and [BiEO]n layers allowed to show the
evolution of M*-E distance versus the changes with the square pyramidal SP
coordination polyhedra. All are different, in red PbO one finds {PbEO4E4}
square antiprism, a {[Bi.E]O4X4Xapical} monocapped square antiprism in PbFX and
BiOX and {BiEO4F4}square antiprism in Bi2NbO5F. To analyze the crystal
chemistry results, the electronic structures of these compounds were calculated
within density functional theory DFT. Real space analyses of electron
localization illustrate a full volume development of the lone pair on PbII
within {PbEO4E4} in PbOE, {PbEF4X4} in PbFXE and Bi(III) within {BiEO4X4}
square antiprisms, contrary to Bi(III) within {[Bi.E]O4F4Fapical} monocapped
square antiprism. Larger hardness (larger bulk modules B0) and band gap
characterize BiOF versus PbO due to the presence of F which brings antibonding
Bi-F interactions oppositely to mainly bonding Bi-O. In PbFX and BiOX series
there is a systematic decrease of B0 with the increasing volume following the
nature and size of X which is decreasingly electronegative and increasingly
large. The electronic densities of states mirror these effects through the
relative energy position and relative electronegativities of F/X and O/X
leading to decrease the band gap.Comment: 20 text pages/ 10 multifigures/large review article, J. Progress
Solid State Chemistry, under production MAY 201
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