32,800 research outputs found
Observational Study Of the Quasi-Periodic Fast Propagating Magnetosonic Waves and the Associated Flare on 2011 May 30
On 2011 May 30, quasi-periodic fast propagating (QFP) magnetosonic waves
accompanied by a C2.8 flare were directly imaged by the Atomospheric Imaging
Assembly instrument on board the Solar Dynamics Observatory. The QFP waves
successively emanated from the flare kernel, they propagated along a cluster of
open coronal loops with a phase speed of 834 km/s during the flare's rising
phase, and the multiple arc-shaped wave trains can be fitted with a series of
concentric circles. We generate the k-omega diagram of the Fourier power and
find a straight ridge that represents the dispersion relation of the waves.
Along the ridge, we find a lot of prominent nodes which represent the available
frequencies of the QFP waves. On the other hand, the frequencies of the flare
are also obtained by analyzing the flare light curves using the wavelet
technique. The results indicate that almost all the main frequencies of the
flare are consistent with those of the QFP waves. This suggests that the flare
and the QFP waves were possibly excited by a common physical origin. On the
other hand, a few low frequencies revealed by the k-omega diagram can not be
found in the accompanying flare. We propose that these low frequencies were
possibly due to the leakage of the pressure-driven p-mode oscillations from the
photosphere into the low corona, which should be a noticeable mechanism for
driving the QFP waves observed in the corona.Comment: Published in Ap
Seebeck coefficient of thermoelectric moleculat junction: First-principles calculations
A first-principles approach is presented for the thermoelectricity in
molecular junctions formed by a single molecule contact. The study investigates
the Seebeck coefficient considering the source-drain electrodes with distinct
temperatures and chemical potentials in a three-terminal geometry junction. We
compare the Seebeck coefficient in the amino-substituted and unsubstituted
butanethiol junction and observe interesting thermoelectric properties in the
amino-substituted junction. Due to the novel states around the Fermi levels
introduced by the amino-substitution, the Seebeck coefficient could be easily
modulated by using gate voltages and biases. When the temperature in one of the
electrodes is fixed, the Seebeck coefficient varies significantly with the
temperature in the other electrode, and such dependence could be modulated by
varying the gate voltages. As the biases increase, richer features in the
Seebeck coefficient are observed, which are closely related to the transmission
functions in the vicinity of the left and right Fermi levels.Comment: 4 pages; 2 figure
Adversarial PoseNet: A Structure-aware Convolutional Network for Human Pose Estimation
For human pose estimation in monocular images, joint occlusions and
overlapping upon human bodies often result in deviated pose predictions. Under
these circumstances, biologically implausible pose predictions may be produced.
In contrast, human vision is able to predict poses by exploiting geometric
constraints of joint inter-connectivity. To address the problem by
incorporating priors about the structure of human bodies, we propose a novel
structure-aware convolutional network to implicitly take such priors into
account during training of the deep network. Explicit learning of such
constraints is typically challenging. Instead, we design discriminators to
distinguish the real poses from the fake ones (such as biologically implausible
ones). If the pose generator (G) generates results that the discriminator fails
to distinguish from real ones, the network successfully learns the priors.Comment: Fixed typos. 14 pages. Demonstration videos are
http://v.qq.com/x/page/c039862eira.html,
http://v.qq.com/x/page/f0398zcvkl5.html,
http://v.qq.com/x/page/w0398ei9m1r.htm
- …