188 research outputs found
Gastrointestinal bleeding after aortic surgery: a case report
This is an Open Access article distributed under the terms of the Creative Commons Attribution Licens
Obscuring fraction of active galactic nuclei implied by supernova and radiative feedbacks
We study the obscuring structure of circumnuclear disks (CNDs) by considering
supernova (SN) feedbacks from nuclear starburst and the effect of anisotropic
radiative pressure from AGNs. We suppose that the mass accretion onto a central
supermassive black hole (SMBH) is triggered by SN-driven turbulence within
CNDs, and we explore how the structures of CNDs depend on the BH mass () and AGN luminosity (). We find that the obscuring fraction
() peaks at of the Eddington luminosity (), and its maximal value is for less massive
SMBHs (e.g., ). This is because the scale height
of CNDs is determined by the SN-driven accretion for a smaller ,
while the dusty molecular gas in CNDs is blown away by the radiation pressure
from AGNs beyond the critical luminosity. On the other hand, for massive SMBHs
(e.g., ), is always smaller than
, and it is almost independent of because the scale height
of CNDs is mainly controlled by the maximal star-formation efficiency () in CNDs. By comparison with the obscuring fractions suggested from
the mid-infrared observations of nearby AGNs, the SN plus radiative feedback
model with well reproduces the
observations for . We also find that the intense
starburst or the existence of dust-free absorbers inside CNDs are necessary, to
explain X-ray observations.Comment: 17 pages, 11 figures, Accepted for publication in Ap
Revisiting Affleck-Dine Leptogenesis with light sleptons
We revisit the Affleck-Dine leptogenesis via the flat direction with
a light slepton field. Although the light slepton field is favored in
low-energy SUSY phenomenologies, such as the muon anomaly and
bino-slepton coannihilation, it may cause a problem in the Affleck-Dine
leptogenesis: it may create an unwanted charge-breaking vacuum in the
Affleck-Dine field potential so that the Affleck-Dine field is trapped during
the course of leptogenesis. We investigate the conditions under which such an
unwanted vacuum exists and clarify that both thermal and quantum corrections
are important for the (temporal) disappearance of the charge-breaking minimum.
We also confirm that if the charge-breaking vacuum disappears due to the
thermal or quantum correction, the correct baryon asymmetry can be produced
while avoiding the cosmological gravitino problem.Comment: 12 pages, 2 figures, version accepted for publication in JCAP (v2
4 electron temperature driven ultrafast electron localization
Valence transitions in strongly correlated electron systems are caused by
orbital hybridization and Coulomb interactions between localized and
delocalized electrons. The transition can be triggered by changes in the
electronic structure and is sensitive to temperature variations, applications
of magnetic fields, and physical or chemical pressure. Launching the transition
by photoelectric fields can directly excite the electronic states and thus
provides an ideal platform to study the correlation among electrons on
ultrafast timescales. The EuNi(SiGe) mixed-valence
metal is an ideal material to investigate the valence transition of the Eu ions
via the amplified orbital hybridization by the photoelectric field on
sub-picosecond timescales. A direct view on the 4 electron occupancy of the
Eu ions is required to understand the microscopic origin of the transition.
Here we probe the 4 electron states of EuNi(SiGe)
at the sub-ps timescale after photoexcitation by X-ray absorption spectroscopy
across the Eu -absorption edge. The observed spectral changes due to the
excitation indicate a population change of total angular momentum multiplet
states = 0, 1, 2, and 3 of Eu, and the Eu = 7/2 multiplet
state caused by an increase in 4 electron temperature that results in a 4
localization process. This electronic temperature increase combined with
fluence-dependent screening accounts for the strongly non-linear effective
valence change. The data allow us to extract a time-dependent determination of
an effective temperature of the 4 shell, which is also of great relevance in
the understanding of metallic systems' properties, such as the ultrafast
demagnetization of ferromagnetic rare-earth intermetallics and their
all-optical magnetization switching.Comment: 19 pages, 9 figure
Interactive Rakuchu Rakugai-zu (Views in and Around Kyoto)
This book constitutes the refereed proceedings of the First International Conference on Culture and Computing, C&C 2020, held as part of the 22nd International Conference on Human-Computer Interaction, HCII 2020, in July 2020. The conference was planned to be held in Copenhagen, Denmark, but had to change to a virtual conference mode due to the COVID-19 pandemic.Rakuchu Rakugai-zu is a screen painting illustrating in and around Kyoto created from the beginning of 16th century until 17th century. As in the Funaki Version of Rakuchu Rakugai-zu everyday lives of over 2, 000 people in Kyoto are vividly painted, the painting is a good material to learn their customs in early 17th century in Kyoto. However, it is difficult to understand the details of the painting, if background information is not provided. How to document such information and how to provide people such information would be crucial for the future of museums. To cope with this, we are carrying out a project to develop the interactive Rakuchu Rakugai-zu, Funaki Version. Firstly, we digitize the painting with ultra-high resolution. Secondly, using historical books regarding the customs of that era., we identify clothes and behaviors of each person in the painting and linked them to the person in the painting. Thirdly, we develop the technology to provide such information interactively using text or voice. Fourthly, we develop present Funaki Version including various manga characters so that we can compare old and present customs of people. Integrating these contents and technologies we are now developing the interactive Rakuchu Rakugai-zu, Funaki Version
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