4,906 research outputs found
Gold(I)-catalysed one-pot synthesis of chromans using allylic alcohols and phenols
A gold(I)-catalysed reaction of allylic alcohols and phenols produces chromans regioselectively via a one-pot Friedel–Crafts allylation/intramolecular hydroalkoxylation sequence. The reaction is mild, practical and tolerant of a wide variety of substituents on the phenol
Deactivation of gold(I) catalysts in the presence of thiols and amines – characterisation and catalysis
Ultra-high material-quality silicon pillars on glass
We investigated a unique crystalline silicon structure-silicon pillars-formed by melt crystallization using millisecond-long single-pulse pulses of 110-GHz radiation of amorphous Si thin films deposited on glass by hot-wire chemical vapor deposition. With many microscopy techniques, we found that these pillars usually contain 1-4 randomly oriented grains with growth direction and grain boundaries perpendicular to the substrate surface. The grains in the Si pillars have ultra-high crystalline quality with grain sizes up to 20 m. We attribute the formation mechanism of the Si pillars to the extremely high heating/cooling rates of Si on a glass substrate using millimeter-wave radiation and the important roles played by wetting and capping layers during the annealing process. Such understandings may enable us to prepare ultra-high-quality, large-grained poly-Si on inexpensive foreign substrates at large scale and low cost. © 2010 IEEE.published_or_final_versionThe 35th IEEE Photovoltaic Specialists Conference (PVSC 2010), Honolulu, HI., 20-25 June 2010. In Proceedings of 35th PVSC, 2010, p. 002176-00217
Implementation of three-qubit Toffoli gate in a single step
Single-step implementations of multi-qubit gates are generally believed to
provide a simpler design, a faster operation, and a lower decoherence. For
coupled three qubits interacting with a photon field, a realizable scheme for a
single-step Toffoli gate is investigated. We find that the three qubit system
can be described by four effective modified Jaynes-Cummings models in the
states of two control qubits. Within the rotating wave approximation, the
modified Jaynes-Cummings models are shown to be reduced to the conventional
Jaynes-Cummings models with renormalized couplings between qubits and photon
fields. A single-step Toffoli gate is shown to be realizable with tuning the
four characteristic oscillation periods that satisfy a commensurate condition.
Possible values of system parameters are estimated for single-step Toffli gate.
From numerical calculation, further, our single-step Toffoli gate operation
errors are discussed due to imperfections in system parameters, which shows
that a Toffoli gate with high fidelity can be obtained by adjusting pairs of
the photon-qubit and the qubit-qubit coupling strengthes. In addition, a
decoherence effect on the Toffoli gate operation is discussed due to a thermal
reservoir.Comment: 8 pages, 4 figures, to appear in PR
Inversion of exciton level splitting in quantum dots
The demonstration of degeneracy of exciton spin states is an important step toward the production of entangled photon pairs from the biexciton cascade. We measure the fine structure of exciton and biexciton states for a large number of single InAs quantum dots in a GaAs matrix; the energetic splitting of the horizontally and vertically polarized components of the exciton doublet is shown to decrease as the exciton confinement decreases, crucially passing through zero and changing sign. Thermal annealing is shown to reduce the exciton confinement, thereby increasing the number of dots with splitting close to zero
Gold(I)-Catalysed Direct Thioetherifications Using Allylic Alcohols: an Experimental and Computational Study
A gold(I)-catalysed direct thioetherification reaction between allylic alcohols and thiols is presented. The reaction is generally highly regioselective (S(N)2′). This dehydrative allylation procedure is very mild and atom economical, producing only water as the by-product and avoiding any unnecessary waste/steps associated with installing a leaving or activating group on the substrate. Computational studies are presented to gain insight into the mechanism of the reaction. Calculations indicate that the regioselectivity is under equilibrium control and is ultimately dictated by the thermodynamic stability of the products
Time series analysis and modelling of the freezing of gait phenomenon
Freezing of Gait (FOG) is one of the most debilitating symptoms of
Parkinson's Disease and is associated with falls and loss of independence. The
patho-physiological mechanisms underpinning FOG are currently poorly
understood. In this paper we combine time series analysis and mathematical
modelling to study the FOG phenomenon's dynamics. We focus on the transition
from stepping in place into freezing and treat this phenomenon in the context
of an escape from an oscillatory attractor into an equilibrium attractor state.
We extract a discrete-time discrete-space Markov chain from experimental data
and divide its state space into communicating classes to identify the
transition into freezing. This allows us to develop a methodology for
computationally estimating the time to freezing as well as the phase along the
oscillatory (stepping) cycle of a patient experiencing Freezing Episodes (FE).
The developed methodology is general and could be applied to any time series
featuring transitions between different dynamic regimes including time series
data from forward walking in people with FOG.Comment: this version: correction of author spelling, submitted, 25 pages, 20
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