Hamiltonian systems such as the gravitational N-body problem have time-reversal symmetry. However, all numerical N-body integration schemes, including symplectic ones, respect this property only approximately. In this paper, we present the new N-body integrator JANUS, for which we achieve exact time-reversal symmetry by combining integer and floating point arithmetic. JANUS is explicit, formall...

This investigation, following our recent report on the one-pot hemi-micellar interfacial synthesis of Janus gold nanoclusters and the inter-cluster electron coupling establishing insulator-metal transition in the oriented Janus monolayers [Langmuir, 2010, 26(17), 14047], was to fabricate modified electrodes for sensing dopamine, the neurotransmitter. With a detection limit in the sub-nanomolar ...

We calculate scattering curves from Janus micelles based on a new particle scattering factor which we tested against Monte-Carlo simulations. If we compare scattering data from Janus micelles with data of core shell particles, we find that it is virtually impossible to distinguish the particle scattering factors of the two structures, if the scattering length densities of the respective segment...

We introduce a representative minimal model for phoretically interacting active colloids. Combining kinetic theory, linear stability analyses, and a general relation between self-propulsion and phoretic interactions in autodiffusiophoretic and autothermophoretic Janus colloids collapses the parameter space from six to two dimensionless parameters: area fraction and Péclet number. This collapse ...

Brief Summary of Objectives: There are three objectives of the contract: to perform research and development in parallel parsing, semantic representation, ill-formed input, discourse, and tools for linguistic knowledge acquisition, and to integrate software components from BBN and elsewhere to produce Janus, DARPA's New Generation Natural Language Interface, and to demonstrate state-of-theart n...

In our effort to build spoken language translation systems we have extended our JANUS system to process spontaneous human–human dialogs in a new domain, two people trying to schedule a meeting. Trained on an initial database JANUS-2 is able to translate English and German spoken input in either English, German, Spanish, Japanese or Korean output. To tackle the difficulty of spontaneous human–hu...

We present a computational and theoretical study of dendrimer-based nanoparticles composed of two linear chain types attached to the terminal groups of a core dendrimer. The chains were coupled to the dendritic core in both topologically Janus and alternating configurations. We find that a straightforward extension of the well-known scaling theory for the size of star polymers due toDaoud andCo...