6,084 research outputs found
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Continuous upflows and sporadic downflows observed in active regions
We present a study of the temporal evolution of coronal loops in active
regions and its implications for the dynamics in coronal loops. We analyzed
images of the Atmospheric Imaging Assembly (AIA) on the Solar Dynamics
Observatory (SDO) at multiple temperatures to detect apparent motions in the
coronal loops. Quasi-periodic brightness fluctuations propagate upwards from
the loop footpoint in hot emission at 1MK, while sporadic downflows are seen in
cool emission below 1MK. The upward motion in hot emission increases just after
the cool downflows. The apparent propagating pattern suggests a hot upflow from
the loop footpoints, and is considered to supply hot plasma into the coronal
loop, but a wavelike phenomenon cannot be ruled out. Coronal condensation
occasionally happens in the coronal loop, and the cool material flows down to
the footpoint. Emission from cool plasma could have a significant contribution
to hot AIA channels in the event of coronal condensation.Comment: 5 pages, 6 figures, A&A in pres
Resonant Inelastic X-Ray Scattering at the K Edge of Ge
We study the resonant inelastic x-ray scattering (RIXS) at the edge of
Ge. We measure RIXS spectra with systematically varying momenta in the final
state. The spectra are a measure of exciting an electron-hole pair. We find a
single peak structure (except the elastic peak) as a function of photon energy,
which is nearly independent of final-state momenta. We analyze the experimental
data by means of the band structure calculation. The calculation reproduces
well the experimental shape, clarifying the implication of the spectral shape.Comment: 17 pages,9 figures, Please also see our related paper:
cond-mat/040500
The Whalesong
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The Whalesong
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Modeling and optimization of the multichannel spark discharge
This paper reports a novel analytic model of this multichannel spark discharge, considering the delay time in the breakdown process, the electric transforming of the discharge channel from a capacitor to a resistor induced by the air breakdown, and the varying plasma resistance in the discharge process. The good agreement between the experimental and the simulated results validated the accuracy of this model. Based on this model, the influence of the circuit parameters on the maximum discharge channel number (MDCN) is investigated. Both the input voltage amplitude and the breakdown voltage threshold of each discharge channel play a critical role. With the increase of the input voltage and the decrease of the breakdown voltage, the MCDN increases almost linearly. With the increase of the discharge capacitance, the MDCN first rises and then remains almost constant. With the increase of the circuit inductance, the MDCN increases slowly but decreases quickly when the inductance increases over a certain value. There is an optimal value of the capacitor connected to the discharge channel corresponding to the MDCN. Finally, based on these results, to shorten the discharge time, a modified multichannel discharge circuit is developed and validated by the experiment. With only 6-kV input voltage, 31-channels discharge is achieved. The breakdown voltage of each electrode gap is larger than 3 kV. The modified discharge circuit is certain to be widely used in the PSJA flow control field
Dielectron widths of the S-, D-vector bottomonium states
The dielectron widths of and vector decay
constants are calculated using the Relativistic String Hamiltonian with a
universal interaction. For the dielectron widths and
their ratios are obtained in full agreement with the latest CLEO data. For
and a good agreement with experiment is
reached only if the 4S--3D mixing (with a mixing angle ) and 6S--5D mixing (with ) are taken into
account. The possibility to observe higher "mixed -wave" resonances,
with is discussed. In particular,
, originating from the pure state,
can acquire a rather large dielectron width, eV, so that this
resonance may become manifest in the experiments. On the contrary, the
widths of pure -wave states are very small,
eV.Comment: 13 pages, no figure
Band structure approach to the resonant x-ray scattering
We study the resonance behaviour of the forbidden 600 and 222 x-ray Bragg
peaks in Ge using LDA band structure methods. These Bragg peaks remain
forbidden in the resonant dipole scattering approximation even taking into
account the non local nature of the band states. However they become allowed at
resonance if the eigenstates of the unoccupied conduction band involve a
hybridization of p like and d like atomic states. We show that the energy
dependence of the resonant behaviour, including the phase of the scattering, is
a direct measure of this p-d hybridization.and obtain quantitative agreement
with experiment. A simple physical picture involving a product of dipole and
quadrupolar transition matrix elements explains this behaviour and shows that
it should be generally true for cases where the resonating atom is not at an
inversion center. This has strong implications for the description of the
resonance behavior of x-ray scattering in materials where the resonant atom is
not at an inversion center such as V2O3 and in ferro and antiferro electric and
piezo electric materials in general.Comment: 4 pages, 5figure
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