20 research outputs found
Identifying electron transfer coordinates in Donor-Bridge-Acceptor systems using mode projection analysis
We report upon an analysis of the vibrational modes that couple and drive the state-to-state electronic
transfer branching ratios in a model donor-bridge-acceptor system consisting of a phenothiazine-based donor
linked to a naphthalene-monoimide acceptor via a platinum-acetylide bridging unit. Our analysis is based
upon an iterative Lanczos search algorithm that finds superpositions of vibronic modes that optimize the
electron/nuclear coupling using input from excited-state quantum chemical methods. Our results indicate
that the electron transfer reaction coordinates between a triplet charge transfer state and lower lying chargeseparated
and localised excitonic states are dominated by asymmetric and symmetric modes of the acetylene
groups on either side of the central atom in this system. In particular, we find that while a nearly symmetric
mode couples both the charge-separation and charge-recombination transitions more or less equally, the
coupling along an asymmetric mode is far greater suggesting that IR excitation of the acetylene modes
preferentially enhances charge recombination transition relative to charge-separation
Finding Common Ground: A Survey of Capacitive Sensing in Human-Computer Interaction
For more than two decades, capacitive sensing has played a prominent role in human-computer interaction research. Capacitive sensing has become ubiquitous on mobile, wearable, and stationary devices---enabling fundamentally new interaction techniques on, above, and around them. The research community has also enabled human position estimation and whole-body gestural interaction in instrumented environments. However, the broad field of capacitive sensing research has become fragmented by different approaches and terminology used across the various domains. This paper strives to unify the field by advocating consistent terminology and proposing a new taxonomy to classify capacitive sensing approaches. Our extensive survey provides an analysis and review of past research and identifies challenges for future work. We aim to create a common understanding within the field of human-computer interaction, for researchers and practitioners alike, and to stimulate and facilitate future research in capacitive sensing
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Forming and smoothing D{sub 2} and HD layers for ICF by infra-red heating
We describe a technique to form and smooth uniform solid D{sub 2}, HD or DT layers for inertial confinement fusion targets. Pumping the infrared (IR) collision induced vibration-rotation band generates a bulk heating of the solid. Shadowgraphs reveal that this bulk heat quickly redistributes the solid into a relatively uniform layer depending on the IR intensity profile. Measured redistribution time constants are used to determine the conversion efficiency of IR light into bulk heat. Phase shifting interferometry reveals that the surface roughness decreases with increasing IR heating
Traveling planetary wave activity from mesopause region airglow temperatures determined by the Network for the Detection of Mesospheric Change (NDMC)
The global distribution of traveling planetary wave (PW) activity in the mesopause region is
estimated
for the first time from ground-based airglow measurements. Monthly and total mean climatologies of
PW power are determined from rotational temperatures measured at 19 sites from 78° N to 76° S
which contribute to the Network for the Detection of Mesospheric Change (NDMC). Wave power is
expressed as the standard deviation of nocturnal mean temperature around the seasonal temperature
variation. The results from 20° N confirm the SABER traveling PW proxy by Offermann et al. (2009,
J. Geophys. Res. 114, D06110) at two altitudes. Most sites between 69° S and 69° N show total
mean traveling PW activity of about 6 K, and only some high latitude sites have considerably
higher activity levels. At the two tropical sites, there is practically no seasonal variation of PW
activity. At 70% of the midlatitude sites, the seasonal variation is moderate for most of the
year, but it is quite appreciable at all high latitude sites. Results about traveling PW
activity at 87 km and 95 km available from several sites signal similar behavior at both
altitudes. The total mean climatological results here obtained have further been used to separate
the traveling PW contribution from the superposition of wave types contained in OH rotational
temperature fluctuations measured by the SCIAMACHY instrument on Envisat. A narrow equatorial wave
activity maximum is probably caused by gravity waves, while a tendency towards greater activity
at higher
northern latitudes may be due to stationary planetary waves