Home > seminars
| date: | 2008 Nov 13(Thu) 15：00-17：00 |
room: | Kobe University, Shizen Bldg. #3, room 508.
Nagoya University , Hokkaido University,
(This seminar is a teleconference by the use of video-conferencing system.)
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speaker: | Prof. Keith Holsapple (Dept. Aeronautics and Astronautics, Univ. of Washington)
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| organizer: | Dr.Akiko Nakamura (Kobe University)
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| title: | The spin data for asteroids:
what does that tell us about
their properties? |
| abstract: | Many aspects of our studies on the small bodies of the solar
system require information about their internal properties, especially
their porosity and strength. It is precisely those global properties
that give the ability to withstand or to be destroyed during spin-up,
tidal passages and impacts. I will discuss the elements of porosity and
strength that are needed. I will present some of my recent theory on the
spin limits for small bodies. A comparison of those theories to the
actual spin data is presented, that comparison gives the only ground
truth we have on the actual mechanical properties of those bodies.
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| date: | 2008 Oct 7(Tue) 16:30 - 18:00 |
room: | Hokkaido University, Science Bldg. #8, Cosmo-studio (8-2-01),
Kobe University, Shizen Bldg. #3, room 508.
(This seminar is a teleconference by the use of video-conferencing system.)
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speaker: | Dr. Munetaka Ueno (University of Tokyo)
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| title: | AKARI mission program;
"From a star forming region to the interplanetary dust" |
| abstract: |
I will introduce preliminary results of AKARI observations on
the star forming regions and on the interplanetary dust.
Over the last decade, submm astronomy has revealed a class of
heavily embedded, pre-stellar cores that are "invisible" or faint
at infrared wavelengths. These low-mass Class 0 and Class I sources
are beginning their main accretion phase prior to collapse, and
hence represent the earliest and most exciting stages of
star-formation. We conducted a significant unbiased census of
star-forming cores in a large number of molecular clouds as part
of a sensitive large area galactic plane survey with AKARI.
AKARI survey is the first all-Galaxy measurement of the SED's of
sources in star forming regions, allowing estimation of density
and temperature gradients of a very large sample of young cores.
In our dedicated observing program, a survey of Chamaeleon dark
cloud was carried out using slow-scanning modes of AKARI/IRC, since
the mode realizes her sensitivities reaching the faint level of
photosphere of the main-sequence stars, and also remains wide
coverage of the sky to find any orphan young stars in the region.
The time scale in the proto-planetary disk must be determined by
the quantitative samples pretty directly. The result of the
Chamaeleon survey will be focused on in the talk.
Lifetime of the interplanetary dust under the Poynting-Robertson
drag is much shorter than the age of the Solar System, which leads
that some supply sources must exist in the present Solar System, as
well as the Vega-like stars. The birth of Infrared Astronomical
Satellite (IRAS) dramatically changed then smooth featureless picture
of the zodiacal dust cloud by revealing numerous bands of asteroidal
debris, several narrow trails of cometary dust, and a clumpy dust
ring just outside the Earth's circumsolar orbit. The IRAS has thus
renamed the used to be featureless zodiacal cloud as interplanetary
dust cloud complex. However, due to sparse coverage of solar
elongation angle, the IRAS data alone may not tell us much about
the intermediate scale structures in the visible zodiacal light.
In the beginning of 1990s the COBE/DIRBE mapped almost entire sky
with a 0.7 arc-degree size beam and with established calibration.
One of the most exciting results of the DIRBE/COBE mission is a
full confirmation of the mean motion resonance(MMR) of the dust
ring, and an isolation of the leading and trailing blobs in the
MMR feature. The AKARI mission's coverage of the solar elongation
angle is limited to very narrow span from 89.5 to 91.5 arc-degree,
however the AKARI mission is proud of its superbly high sensitivity
and commands its sharp vision of fine spatial resolution. Furthermore,
its wavelength coverage is ideally tuned for studying local IPDs and
the IPD cloud as well. Topics on the large scale mapping of the IDP
cloud, and spectroscopy of the zodiacal emission will be discussed
in the talk.
I will also introduce a current status of two missions; PLANET-C
and EXCEED (former name was TOPS) briefly at the end of my talk.
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| date: | 2008 Oct 7(Tue) 13:00 - 14:30 |
room: | Kobe University, Shizen Bldg. #3, room 508,
Hokkaido University, Science Bldg. #8, Cosmo-studio (8-2-01),
Tohoku University, Planetary Plasma and Atmospheric Research Center,
University of Tokyo, Science Bldg. #1,
Kyushu University, Science Bldg. #3, room 3603
ISAS/JAXA.
(This seminar is a teleconference by the use of video-conferencing system.)
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speaker: | Dr. Seiya Nishizawa (Kobe University)
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| title: | Detection of trend in Meteorological data |
| date: | 2008 Sep 10(Wed) 16:30 - |
room: | Hokkaido University, Science Bldg. #8, Cosmo-studio (8-2-01),
Kobe University, Shizen Bldg. #3, room 508.
(This seminar is a teleconference by the use of video-conferencing system.)
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speaker: | Dr. Toshikazu Ebisuzaki (RIKEN)
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| title: | Investigation of Ultra High Energy Cosmic Rays by JEM-EUSO |
| remark: | This seminar is jointly hosted by the Universal seminar of
the Hokkaido University. |
| date: | 2008 Aug 12(Tue) 16:30 - 18:00 |
room: | Institute of Tmperature Science 210 in Hokkaido University , This is a video tele-conference connected
with Kobe University 508 (Shizen-3 bldg)
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speaker: | Dr. Takayuki Tanigawa (Tokyo Institute of Technology)
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| title: | On proto-satellite disks and formation of satellite systems |
| date: | 2008 Aug 11 (Mon) 15:10 - 16:10 |
room: | Kyoto Univ. Faculty of
Science Bldg.#5 318, Univ. of Tokyo Faculty of Science Bldg.#1 807
This is a video tele-conference connected with Kobe Univ. Bldg. N3 508 (Shizen-3 bldg), ISAS/JAXA, Osaka Univ., Tokai
Univ., Titech, NAO, Nagoya Univ, and Hokkaido University
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speaker: | Mr. Takayuki Muto (Kyoto University)
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| title: | Some Recent Results on Type I Migration |
| date: | 2008 Aug 11 (Mon) 14:00 - 15:00 |
room: | Kobe Univ. Bldg. N3 508 (Shizen-3 bldg), Univ. of Tokyo Faculty of Science Bldg.#1 807
This is a video tele-conference connected with Kyoto Univ.,ISAS/JAXA, Osaka Univ., Tokai
Univ., Titech, NAO, Nagoya Univ, and Hokkaido University
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speaker: | Prof. Yusuke Seto (Kobe University)
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| title: | A unique material having heavy oxygen isotope anomaly discovered in a
primitive carbonaceous chondrite. |
| date: | 2008 Aug 4 (Mon) 16:30 - 18:00 |
room: | Institute of Tmperature Science 210 in Hokkaido University , This is a video tele-conference connected
with Kobe University 508 (Shizen-3 bldg)
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speaker: | Dr. Hidenori Genda (Tokyo Institute of Technology)
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| title: | Some problems and cules in planetary science |
| date: | 2008 Jul 29 (Tue) 15:10 - |
room: | X306 (Sci-X Bldg)
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speaker: | Prof. Syoichi Yoshikawa ( Kyushu University )
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| title: | Some Recent Results on Type I Migration |
| date: | 2008 Jul 29 (Tue) 15:00-16:30 |
room: | 508 (Shizen-3 bldg), This is a video tele-conference connected
with Hokkaido University, Kobe University, ISAS/JAXA, and Kyushu University
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speaker: | Mr. Hiroki Yamamoto ( Kyoto University )
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| title: | Axisymmetric Steady Solutions in an Idealized Model of Atmospheric
General Circulations: Hadley Circulation and Super-rotation |
| date: | 2008 July 16 (Wed) 15:00-16:00 |
room: | seminar room 609 in building N3 (Shizen 3-gou-kan)
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speaker: | Prof. Takashi Onaka (University of Tokyo)
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| title: | The cosmos seen by infrared satellite "AKARI" : Vega-like
stars/absorption by ices/dust in SN |
| date: | 2008 July 10 (Thu) 16:00-17:30 |
room: | 508 (Shizen-3 bldg), This is a video tele-conference connected
with Hokkaido University, Kobe University
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speaker: | Mr. Kentaro Goto (Syngram Co., LTD)
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| title: | Report on RubyKaigi2008 |
| date: | 2008 Jun 30 (Mon) 15:00-16:30 |
room: | 508 (Shizen-3 bldg), This is a video tele-conference connected
with Hokkaido University, University of Tokyo, ISAS/JAXA, Kobe
University, and Kyushu University
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speaker: | Dr. Ryo Ishimaru (University of Tokyo)
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| title: | Chemical effects of satellitesimal impacts on Titan's atmosphere - On
impact origin of Titan's N2 atmosphere |
| date: | 2008 Apr 23 (Wed) 16:00-17:30 |
room: | 609 (Shizen-3 bldg)
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speaker: | Dr. Nuno Peixinho (University of Hawaii, USA /
University of Coimbra, Portugal)
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| title: | The Kuiper Belt and its Progeny: trendy and colorful |
| abstract: |
The Kuiper Belt is a swarm of small icy bodies orbiting mainly beyond Neptune, usually known as
Kuiper Belt Objects (KBOn) or Trans-Neptunian Objects (TNOs). It's existence was somehow predicted
in the first half of the 20th century but it was only observed in 1992. In just 15 years, more
than 1000 bodies were identified and a planethood was lost. Being very far and very faint the study
of the KBOs is quite challenging. Yet it is one of the most active fields in Solar System research.
We will discuss the structure of the Kuiper Belt, its families, its color properties, its evolution
and how those relate with each other.
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| date: | 2008 Apr 18 (wed) 16:00-17:30 |
room: | X206 (Sci-X Bldg)
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speaker: | Dr. Graham Heinson (The University of Adelaide, Australia)
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| title: | Imaging the Australian crust and mantle using magnetotellurics |
| abstract: |
Australia is an excellent laboratory for studying fundamental properties
of the lithosphere, with a diversity of geological processes over a four
billion years history. In this seminar I will talk about the MT method
and some recent onshore and offshore studies, including the Gawler
Craton in South Australia, and the Northwest Shelf in Western Australia.
The MT method yields a measure of Earth's electrical resistivity that
varies over seven orders of magnitude, making it one of the most
diagnostic physical properties of Earth. In the upper crust, fluids and
some mineral phases dominate conduction, but at mid-lower crustal depths
and in the upper mantle, resistivity is a related to temperature of
metamorphism, mineralogy and degree of deformation. Models presented in
this seminar suggest that MT data, combined with seismic and potential
field data, can provide evidence for the geometry of geological
structures, and the geochemical and metamorphic evolution of the crust
and mantle.
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