Presentations (selected)
2022
[Oral]
Invited talk
Ohta, K., Suehiro, S., Kawaguchi, S., Okuda, Y., Wakamatsu, T., Hirose, K., Ohishi, Y., Kodama, M., Hirai, S., & Azuma, S.
Measuring the electrical resistivity of liquid iron at the pressures of planetary cores
SEDI2022, ETH Zurich, Switzerland, 11-15th July
[Poster]
2019
[Oral]
Park, Y., Ohta, K., Itoh, S., Hirose, K.
Evaluating self-diffusion coefficient of iron under high pressure by a combination of resistive-heated diamond anvil cell and secondary ion mass spectrometry
American Geophysical Union Fall Meeting, San Francisco, CA, USA, 9-13th December
Zhang, Z., Onga, K., Zhang, D., Hasegawa, A., Ohta, K., Sun, T., Hirose, K., Wentzcovitch, R.
Thermal conductivity of CaSiO3 perovskite at lower mantle conditions
American Geophysical Union Fall Meeting, San Francisco, CA, USA, 9-13th December
Wakamatsu, T., Ohta, K., Nishihara, Y., Yagi, T., Okuda, Y., Hirose, K.
Measurements of longitudinal wave velocities in lower mantle minerals
The 60th High Pressure Conference of Japan, Sapporo, Japan, 23~25th October
Okuda, Y., Ohta, K., Hasegawa, A., Yagi, T., Hirose, K., Ohishi, Y.
Thermal conductivity of (Mg,Fe)SiO3 post-perovskite at CMB conditions
The 60th High Pressure Conference of Japan, Sapporo, Japan, 23~25th October
Ohta, K., Kodama, M., Matsuki, Y., Kawamura, K., Hirai, S.
In-situ high-pressure geometry observation on sample in a diamond anvil cell using X-ray CT technique
The 60th High Pressure Conference of Japan, Sapporo, Japan, 23~25th October
Ohta, K., Hasegawa, A., Yagi, T., Okuda, Y., Onga, K., Hirose, K., Ohishi, Y.
Measurements of high pressure-temperature thermal conductivity of the Earth’s lower mantle minerals in a laser-heated diamond anvil cell
Japan Geoscience Union Meeting 2019, Makuhari Messe, Chiba city, Chiba pref., Japan, May
[Poster]
Hasegawa, A., Ohta, K., Yagi, T., Hirose, K.
Thermal conductivity of MgO periclase up to 140 GPa and 2000 K
American Geophysical Union Fall Meeting, San Francisco, CA, USA, 9-13th December
Okuda, Y., Ohta, K., Hasegawa, A., Yagi, T., Hirose, K., Imada, S., Ohishi, Y.
High P-T thermal conductivity measurements using externally- and laser-heated DAC on MgSiO3 bridgmanite and Fe-bearing post-perovskite
American Geophysical Union Fall Meeting, San Francisco, CA, USA, 9-13th December
Wakamatsu, T., Ohta, K., Tagawa, S., Yagi, T., Hirose, K., Ohishi, Y.
Sound velocity measurements on hcp-FeHx (x<1) under high pressures by femtosecond pulse laser pump-probe technique
American Geophysical Union Fall Meeting, San Francisco, CA, USA, 9-13th December
Ohta, K., Suehiro, S., Hirose, K., Ohishi, Y.
Electrical resistivity of fcc phase of iron hydrides at high pressures and temperatures
American Geophysical Union Fall Meeting, San Francisco, CA, USA, 9-13th December
Inoue, H., Suehiro, S., Ohta, K., Hirose, K., Ohishi, Y.
Electrical resistivity saturation in Fe-Si alloys at high P-T conditions
American Geophysical Union Fall Meeting, San Francisco, CA, USA, 9-13th December
Suehiro, S., Wakamatsu, T., Ohta, K., Hirose, K., Ohishi, Y.
Measurement of electrical resistivity of melting iron at high P-T conditions
The 60th High Pressure Conference of Japan, Sapporo, Japan, 23~25th October
Ohishi, Y., Hirao, N., Kawaguchi, S., Tanaka, T., Ohta, K., Hirose, K.
Multi-probe measurement and new X-ray undulator at BL10XU/SPring-8
The 60th High Pressure Conference of Japan, Sapporo, Japan, 23~25th October
Park, Y., Ohta, K., Itoh, S., Hirose, K.
Self-diffusion coefficient of iron under high pressure conditions: Toward understanding dynamics of Earth's inner core
The 60th High Pressure Conference of Japan, Sapporo, Japan, 23~25th October
Inoue, H., Suehiro, S., Ohta, K., Hirose, K., Ohishi, Y.
Electrical resistivity of Fe-Si alloys at high pressures and temperatures
The 60th High Pressure Conference of Japan, Sapporo, Japan, 23~25th October
Kimura, S., Ohta, K., Kawazoe, T., Hirose, K., Kagi, T., Yagi, T.
Lattice thermal conductivity measurements on wadsleyite and ringwoodite under the mantle transition zone conditions
The 60th High Pressure Conference of Japan, Sapporo, Japan, 23~25th October
Hasegawa, A., Ohta, K., Yagi, T., Hirose, K.
Thermal conductivity of MgO at high pressures and high temperatures
The 60th High Pressure Conference of Japan, Sapporo, Japan, 23~25th October
Yamamoto, T., Ohta, K., Suehiro, S., Inoue, H.
Development of a stable method for insulator minerals under high P-T using an internally resistivie heated diamond anvil cell
The 60th High Pressure Conference of Japan, Sapporo, Japan, 23~25th October
Hasegawa A, Ohta K, Yagi T & Hirose K
Thermal Conductivity Measurement at High Pressure and High Temperature Similar to Earth’s Lower Mantle Conditions
Goldschmidt conference, Barcelona, Spain, August
Wakamatsu T, Ohta K, Yagi T, Nishihara Y, Okuda Y, Mitsude Y & Hirose K
Sound Velocity Measurements on Lower Mantle Minerals by Femtosecond Pulse Laser Pump-Probe Technique
Goldschmidt conference, Barcelona, Spain, August
Kimura, S., Ohta, K., Kawazoe, T., Hirose, K., Kagi, T., Yagi, T.
Lattice thermal conductivity of wadsleyite and ringwoodite at the mantle transition zone pressures
Goldschmidt conference, Barcelona, Spain, August
Inoue, H., Suehiro, S., Ohta, K., Hirose, K., Ohishi, Y.
Electrical resistivity of hcp Fe-Si alloys at high pressure and temperature
Japan Geoscience Union Meeting 2019, Makuhari Messe, Chiba city, Chiba pref., Japan, May
Onga, K., Ohta, K., Hasegawa, A., Yagi, T., Hirose, K., Ohishi, Y.
Lattice thermal conductivity of CaSiO3 perovskite at high pressures and high temperatures
Japan Geoscience Union Meeting 2019, Makuhari Messe, Chiba city, Chiba pref., Japan, May
Hasegawa, A., Ohta, K., Yagi, T.
Thermal conductivity measurements on iron and MgO periclase at high pressure and high temperature similar to the Earth’s mid-lower mantle conditions
Japan Geoscience Union Meeting 2019, Makuhari Messe, Chiba city, Chiba pref., Japan, May
*Student poster award
Yamamoto, T., Ohta, K., Suehiro, S., Inoue, H.
Internally resistive heated diamond anvil cell experiments with metal encapsulated minerals
Japan Geoscience Union Meeting 2019, Makuhari Messe, Chiba city, Chiba pref., Japan, May
Kimura, S., Ohta, K., Kawazoe, T., Hirose, K., Kagi, H., Yagi, T.
Lattice thermal conductivity of wadsleyite and ringwoodite at the mantle transition zone pressures
Japan Geoscience Union Meeting 2019, Makuhari Messe, Chiba city, Chiba pref., Japan, May
2018
[Oral]
Ohta, K., Suehiro, S., Hirose, K., Ohishi, Y.
Electrical resistivity of fcc phase iron hydrides at high pressures and temperatures
The 59th High Pressure Conference of Japan, Okayama, Japan, 26~28th November
[Link]
Suehiro, S., Ohta, K., Hasegawa, A., Yagi, T., Hirose, K.
Simultaneous measurements of electrical and thermal conductivity of iron at high pressure and temperature in an internal heating method
The 59th High Pressure Conference of Japan, Okayama, Japan, 26~28th November
[Link]
Hasegawa, A., Yagi, T., Ohta, K., Hirose, K.
Thermal conductivity measurement under high pressure and high temperature conditions
The 59th High Pressure Conference of Japan, Okayama, Japan, 26~28th November
[Link]
Okuda, Y., Ohta, K., Sinmyo, R., Yagi, T., Ohishi Y., Hirose, K.
Anomalous behavior of the compressibility and thermal conductivity of Fe-Al-bearing bridgmanite
Goldschmidt conference, Boston, USA, August 12~17th
[Link]
Ohta, K.
Experimental determination of the thermal and electrical conductivity of iron at Earth’s core conditions
High Pressure Research at Gordon Research Conference 2018, Holderness School, NH, USA, July.
Ohta, K., Suehiro, S.
Experimentally inferred thermal conductivity of planetary cores
Japan Geoscience Union Meeting 2018, Makuhari Messe, Chiba city, Chiba pref., Japan, May
Ohta, K., Nishihara, Y., Sato, Y., Hirose, K., Yagi, T., Kawaguchi, S., Hirao, N., Ohishi, Y.
Anisotropic thermal conductivity of hcp iron and the implications for the Earth’s inner core
Japan Geoscience Union Meeting 2018, Makuhari Messe, Chiba city, Chiba pref., Japan, May
[Poster]
Inoue, H., Suehiro, S., Ohta, K., Hirose, K., Ohishi, Y.
Electrical resistivity of hcp Fe-Si alloy at high pressure and temperature
AGU 2018 Fall Meeting, Washington D.C., USA, 10-14 December
[Link]
Suehiro, S., Ohta, K., Hirose, K., Ohishi, Y.
Measurement of electrical conductivity of iron at high pressure and temperature in an internally-heated diamond anvil cell
AGU 2018 Fall Meeting, Washington D.C., USA, 10-14 December
[Link]
Tagawa, S., Ohta, K., Hirose, K., Ohishi, Y.
Phase relations in non-stoichiometric FeHx at high pressures
AGU 2018 Fall Meeting, Washington D.C., USA, 10-14 December
[Link]
*Outstanding student presentation award
Hasegawa, A., Ohta, K., Yagi, T., Hirose, K.
Thermal conductivity measurement at high pressure and high temperature corresponding to deep Earth’s condition
AGU 2018 Fall Meeting, Washington D.C., USA, 10-14 December
[Link]
Okuda, Y., Ohta, K., Sinmyo, R., Hirose, K., Ohishi, Y.
Spin state and physical properties of (Fe,Al)-bearing bridgmanite
The 59th High Pressure Conference of Japan, Okayama, Japan, 26~28th November
[Link]
*Student poster award
Wakamatsu, T., Ohta, K., Yagi, T., Sinmyo, R., Hirose, K.
Measurements of the longitudinal wave velocity in bridgmanite
The 59th High Pressure Conference of Japan, Okayama, Japan, 26~28th November
[Link]
Inoue, H., Suehiro, S., Ohta, K., Hirose, K., Ohishi, Y.
Measurements of electrical conductivity of Fe-Si alloy at high pressure and temperature
The 59th High Pressure Conference of Japan, Okayama, Japan, 26~28th November
[Link]
Park, Y., Ohta, K., Yagi, T., Hirose, K.
Verifying the Wiedemann-Franz law in bcc iron
The 59th High Pressure Conference of Japan, Okayama, Japan, 26~28th November
[Link]
Kimura, S., Ohta, K., Kawazoe, T., Hirose, K., Kagi, H., Yagi, T.
Lattice thermal conductivity measurements on wadsleyite and ringwoodite at high pressures
The 59th High Pressure Conference of Japan, Okayama, Japan, 26~28th November
[Link]
Suehiro, S., Ohta, K., Hirose, K., Ohishi, Y.
High P-T electrical resistivity measurements on iron in an internally-heated diamond anvil cell
Japan Geoscience Union Meeting 2018, Makuhari Messe, Chiba city, Chiba pref., Japan, May
Wakamatsu, T., Ohta, K., Yagi, T., Sinmyo, R.
Sound velocity measurements on bridgmanite at lower mantle pressures
Japan Geoscience Union Meeting 2018, Makuhari Messe, Chiba city, Chiba pref., Japan, May
*Student poster award
Hasegawa, A., Ohta, K., Yagi, T., Hirose, K., Kondo, T.
Lattice thermal conductivity of (Mg,Fe)O
Japan Geoscience Union Meeting 2018, Makuhari Messe, Chiba city, Chiba pref., Japan, May
Okuda, Y., Ohta, K., Yagi, T., Sinmyo, R., Hirose, K., Ohishi, Y.
Thermal conductivity and compressibility of iron and aluminum-bearing bridgmanite: implications for spin-crossover of iron
Japan Geoscience Union Meeting 2018, Makuhari Messe, Chiba city, Chiba pref., Japan, May
*Student poster award
2017
[Oral]
Suehiro, S., Ohta, K., Hirose, K., Morard, G., Ohishi, Y.
Measurement of electrical conductivity of Fe-Si-S alloys at high pressure
The 58th High Pressure Conference of Japan, Nagoya, Japan, 8~10th November
[Link]
Ohta, K., Sato, Y., Nishihara, Y., Yagi, T., Hirose, K., Kawaguchi, S., Hirao, N., Ohishi, Y.
Measurements of anisotropy in thermal conductivity of hcp iron
The 58th High Pressure Conference of Japan, Nagoya, Japan, 8~10th November
[Link]
Okuda, Y., Ohta, K., Yagi, T., Sinmyo, R., Wakamatsu, T., Ohishi, Y., Hirose, K.
The effect of iron spin crossover on the thermal conductivity of bridgmanite
The 58th High Pressure Conference of Japan, Nagoya, Japan, 8~10th November
[Link]
Tagawa, S., Ohta, K., Yagi, T., Hirose, K., Ohishi, Y.
Formation of non-stoichiometric fcc and hcp FeHx at high pressure and temperature conditions
High-Pressure Mineral Physics Seminar (HPMPS-9), Saint-Malo, France, September
[Link]
[Poster]
Ohishi, Y., Hirao, N., Kawaguchi, S., Yoneyama, A., Ohta, K., Hirose, K.
Installation of X-ray imaging at BL10XU/Spring-8
The 58th High Pressure Conference of Japan, Nagoya, Japan, 8~10th November
[Link]
Wakamatsu, T., Ohta, K., Yagi, T., Hirose, K., Ohishi, Y.
Measurements of sound velocity in iron-nickel alloys by femtosecond laser pulses in a diamond anvil cell
The 58th High Pressure Conference of Japan, Nagoya, Japan, 8~10th November
[Link]
Hasegawa, A., Ohta, K., Yagi, T., Hirose, K., Kondo, T.
The lattice thermal conductivity of (Mg,Fe)O magnesiowustite
The 58th High Pressure Conference of Japan, Nagoya, Japan, 8~10th November
[Link]
Muraoka, S., Matsuoka, T., Ohta, K., Niwa, K., Hirao, N., Ohishi, Y., Shimizu, K., Kume, T., Sasaki, S.
New compound synthesized by laser heating of NaCl and H2 mixture under high pressures
The 58th High Pressure Conference of Japan, Nagoya, Japan, 8~10th November
[Link]
Hasegawa, A., Ohta, K., Yagi, T., Hirose, K., Kondo, T.
Lattice thermal conductivity of (Mg,Fe)O solid solutions
High-Pressure Mineral Physics Seminar (HPMPS-9), Saint-Malo, France, September
[Link]
Suehiro, S., Ohta, K., Hirose, K., Morard, G., Ohishi, Y.
The influence of sulfur on the electrical resistivity of hcp iron: implications for the core conductivity of Mars and Earth
High-Pressure Mineral Physics Seminar (HPMPS-9), Saint-Malo, France, September
[Link]
Wakamatsu, T., Ohta, K., Yagi, T., Hirose, K., Ohishi, Y.
Measurements of sound velocity in iron-nickel alloys by femtosecond laser pulses in a diamond anvil cell
High-Pressure Mineral Physics Seminar (HPMPS-9), Saint-Malo, France, September
[Link]
Okuda, Y., Ohta, K., Yagi, T., Sinmyo, R., Wakamatsu, T., Hirose, K.
Compressional and pressure-temperature dependence of the thermal conductivity of bridgmanite
High-Pressure Mineral Physics Seminar (HPMPS-9), Saint-Malo, France, September
[Link]
Ohta, K., Sato, Y., Nishihara, Y., Yagi, T., Hirose, K., Kawaguchi, S., Hirao, N., Ohishi, Y.
Is thermal conductivity of hcp iron anisotropic?
High-Pressure Mineral Physics Seminar (HPMPS-9), Saint-Malo, France, September
[Link]
Wakamatsu, T., Ohta, K., Hirose, K., Yagi, T.
Sound velocity of iron-nickel alloys determined by femtosecond acoustic measurement in diamond anvil cell
Japan Geoscience Union Meeting 2017, Makuhari Messe, Chiba city, Chiba pref., Japan, May
[Link]
Hasegawa, A., Ohta, K., Yagi, T., Hirose, K., Kondo, T.
Lattice thermal conductivity of (Mg,Fe)O magnesiowustite
Japan Geoscience Union Meeting 2017, Makuhari Messe, Chiba city, Chiba pref., Japan, May
[Link]
2016
[Oral]
“Invited talk”
Ohta, K., Kuwayama, Y., Hirose, K., Shimizu, K., Ohishi, Y., Yagi, T., Suehiro, S.
Experimental determination of the electrical and thermal conductivity of iron at Earth’s core conditions
AGU 2016 Fall Meeting, Moscone Center, San Francisco,CA, USA, 12-16 December
[Link]
Ohta, K., Yagi, T., Hirose, K.
Thermal conductivity of (Mg,Fe)O ferropericlase
The 57th High Pressure Conference of Japan, Tsukuba, Ibaraki Pref. Japan, 26~29th October
[Link]
Suehiro, S., Ohta, K., Yagi, T., Hirose, K.
Thermal conductivity of iron at high pressures and temperature
The 57th High Pressure Conference of Japan, Tsukuba, Ibaraki Pref. Japan, 26~29th October
[Link]
Ohta, K., Okuda, Y., Yagi, T., Hirose, K., Sinmyo, R.
Lattice thermal conductivity of lower mantle minerals
Japan Geoscience Union Meeting 2016, Makuhari Messe, Chiba city, Chiba pref., Japan, May
[Link]
“Invited talk”
Ohta, K., Okuda, Y., Yagi, T., Hirose, K., Sinmyo, R.
Lattice thermal conductivity of lower mantle minerals
The 26th V.M. Goldschmidt Conference, Pacifico Yokoyama, Yokohama city, Kanagawa pref., Japan, June
[Link]
[Poster]
Suehiro, S., Ohta, K., Yagi, T., Hirose, K.
Thermal conductivity of iron at high pressures
AGU 2016 Fall Meeting, Moscone Center, San Francisco,CA, USA, 12-16 December
[Link]
Okuda, Y., Ohta, K., Yagi, T., Sinmyo, R., Hirose, K.
Lattice thermal conductivity of bridgmanite at the lower mantle pressures
AGU 2016 Fall Meeting, Moscone Center, San Francisco,CA, USA, 12-16 December
[Link]
Okuda, Y., Ohta, K., Yagi, T., Sinmyo, R., Hirose, K.
Lattice thermal conductivity of bridgmanite
The 57th High Pressure Conference of Japan, Tsukuba, Ibaraki Pref. Japan, 26~29th October
[Link]
Wakamatsu, T., Ohta, K., Yagi, T.
Femtosecond acoustic measurement of deep Earth materials under high pressures
The 57th High Pressure Conference of Japan, Tsukuba, Ibaraki Pref. Japan, 26~29th October
[Link]
Wakamatsu, T., Ohta, K., Yagi, T.
Femtosecond acoustic measurement with diamond anvil cell to determine the Earth’s core materials
High Pressure Research at, Gordon Research Conference, Holderness School, NH, US, July
17-22 [Link]
Ohta, K., Okuda, Y., Yagi, T., Hirose, K., Sinmyo, R.
Thermal conductivity of the Earth’s lower mantle
High Pressure Research at, Gordon Research Conference, Holderness School, NH, US, July
17-22 [Link]
Okuda, Y., Ohta, K., Yagi, T., Hirose, K., Sinmyo, R.
Lattice thermal conductivity of bridgmanite at the lower mantle pressures
Japan Geoscience Union Meeting 2016, Makuhari Messe, Chiba city, Chiba pref., Japan, May
[Link]
2015
[Oral]
Ohta, K., Yagi, T., Hirose, K., Shimizu, K., Kuwayama, Y., Ohishi, Y.
Measurements of electrical and thermal conductivity of deep Earth materials under multimegabar pressures
The 56th High Pressure Conference of Japan, Hiroshima, Hiroshima Pref. Japan, 10~12th November
[Link]
“Invited talk”
Ohta, K.
Experimental constraints on the electrical and thermal conductivity of the Earth’s core-mantle boundary
Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS), 2015 Annual Meeting, The University of Tokyo, Tokyo, Japan, 31 October.
[Link]
Yagi, T., & Ohta, K.
Development of thermal diffusivity measurement apparatus using diamond anvil cell to explore extreme high pressure and high temperature conditions
36th Japan Symposium on thermophysical properties, Tohoku Univ., Sendai city, Miyagi pref., Japan, November
[Link]
Ohta, K., Suehiro, S., Hirose, K., & Ohishi Y.
The electrical resistivity of iron alloys at Earth’s core conditions
25th V.M. Goldschmidt conference, Prague Congress Center, Prague, Czech Republic, August 16~21th
[Link]
Kato, C., Ohta, K., Hirose, K., Ohishi, Y.
Fcc FeHx at core pressure
25th V.M. Goldschmidt conference, Prague Congress Center, Prague, Czech Republic, August 16~21th
[Link]
Kato, C., Ohta, K., Hirose, K., Ohishi, Y.
Fcc FeHx at core pressure
Japan Geoscience Union Meeting 2015, Makuhari Messe, Chiba city, Chiba pref., Japan, May
[Link]
Tagawa, S., Ohta, K., Hirose, K., Ohishi, Y.
Compression of hcp Fe-Si-H alloy to 130 GPa
Japan Geoscience Union Meeting 2015, Makuhari Messe, Chiba city, Chiba pref., Japan, May
[Link]
[Poster]
Tagawa, S., Ohta, K., Hirose, K., Ohishi, Y.
Compression behavior of Fe-Si-H alloys
American Geophysical Union, 2015 Fall meeting, Coscone center, San Fransisco, CA USA, December
Suehiro, S., Ohta, K., Hirose, K., Morard, G., & Ohishi Y.
Measurement of electrical conductivity of liquid Fe-S alloy at high pressures and temperatures
The 56th High Pressure Conference of Japan, Hiroshima, Hiroshima Pref. Japan, 10~12th November
[Link]
Suehiro, S., Ohta, K., Hirose, K., & Ohishi Y.
The effect of sulfur on the electrical resistivity of iron and implications for planetary cores
25th V.M. Goldschmidt conference, Prague Congress Center, Prague, Czech Republic, August 16~21th
[Link]
2014
[Oral]
“Invited talk”
Ohta, K., Kuwayama, Y., Shimizu, K., Yagi, T., Hirose, K., Ohishi, Y.
Measurements of electrical and thermal conductivity of iron under Earth’s core conditions
American Geophysical Union, 2014 Fall meeting, Coscone center, San Fransisco, CA USA, December
[http://fallmeeting.agu.org/2014/]
Ohta, K., Kuwayama, Y., Hirose, K., Shimizu, K., Ohishi, Y.
Electrical resistivity of iron under Earth’s core conditions
The 55th High Pressure Conference of Japan, Tokushima University, Tokushima city, Tokushima pref., Japan, November
[http://www.highpressure.jp/new/55forum/]
“Invited talk”
Ohta, K.,
Experimental constraints on thermal conductivity of the core-mantle boundary region
The 14th symposium of SEDI (Study of Deep Earth Interior), the Shonan Village Center, Kanagawa, Japan, August
[Link]
Ohta, K., Kuwayama, Y., Hirose, K., Ohishi, Y.
Electrical resistivity of hcp-Fe under core conditions
Japan Geoscience Union Meeting 2014, Pacifico Yokohama, Yokohama city, Kanagawa pref., Japan, April
[Link]
[Poster]
Ohta, K., Kuwayama, Y., Hirose, K., Shimizu, Ohishi, Y.
Electrical resistivity of iron in the Earth’s core conditions
Gordon Research Conference on High Pressure, Research at, University of New England, Biddeford, ME, USA, June
Tagawa, S., Ohta, K., Hirose, K.
Compression of Fe-Si-H alloys
American Geophysical Union, 2014 Fall meeting, Coscone center, San Fransisco, CA USA, December
2013
[Oral]
Ohta, K., Ichimaru, K., Matsuoka, T., Shimizu, K., Ohishi, Y., Hirao, N.
Determination of stability field of metallic fluid hydrogen under high pressures and high temperatures
The High Pressure Conference of Japan, Toki messe, Niigata city, Niigata pref., Japan, November
[Link]
“Invited talk”
Ohta, K.,
Experimental constraints on thermal conductivity of the core-mantle boundary region
Workshop of the IUCr Commission on High Pressure Advances in Static and Dynamic High-Pressure Crystallography, Desy, Hamburg, Germany, September
[Link]
“Invited talk”
Ohta, K.,
Experimental constraints on electrical and thermal conductivity of the core-mantle boundary region
Interior of the Earth, Gordon Research Conference, Mount Holyoke College, South Hadley MA, USA, June
[Link]
2012
[Oral]
Ohta, K., Fujino, K., Kuwayama, Y., Kondo, T., Shimizu, K., Ohishi, Y.
Stability of (Mg1-xFex)O magnesiowüstite in the Earth’s lower mantle
American Geophysical Union, 2012 Fall Meeting, San Francisco, CA, USA, December
Ohta, K., Fujino, K., Kuwayama, Y., Kondo, T., Shimizu, K., Ohishi, Y.
Stability of iron-rich (Mg,Fe)O in the Earth’s lower mantle
The High Pressure Conference of Japan, Osaka Univ., Toyonaka, Osaka pref., Japan, November
[Link]
Ohta, K., Fujino, K., Kuwayama, Y., Kondo, T., Shimizu, K., Ohishi, Y.
Stability of (Mg1-xFex)O magnesiowüstite in the Earth’s lower mantle
The 6th Asian Conference on High Pressure Research, The Institute of Physics, Chinese Academy of Sciences, Beijing, China, August
Ohta, K., Cohen, R. E., Hirose, K., Haule, K., Shimizu, K., Ohishi, Y.
Pressure induced metallization in FeO with rocksalt-type structure
Joint 2012 COMPRES ANNUAL MEETING and High-Pressure Mineral Physics Seminar-8, Granlibakken Conference Center and Lodge, LakeTahoe, CA, July
“Invited talk”
Ohta, K
Spin crossover, Structural Change, and Metallization in FeO under High Pressure
High Pressure, Research at Gordon Research Conference, University of New England Beddeford ME USA, June
[Link]
“Invited talk”
Ohta, K, Yagi, T., Taketoshi, N., Hirose, K., Komabayashi, T., Baba, T., Ohishi, Y., Hernlund, J. W.
Lattice thermal conductivity of MgSiO3 perovskite and post-perovskite at the core-mantle boundary
Joint Symposium of Misasa-2012 and Geofluid-2, Misasa-cho Tottori Japan, March
2011
[Oral]
“Invited talk”
Ohta, K, Yagi, T., Taketoshi, N., Hirose, K., Komabayashi, T., Baba, T., Ohishi, Y., Hernlund, J. W.
Lattice thermal conductivity of MgSiO3 perovskite and post-perovskite at the core-mantle boundary
American Geophysical Union Fall Meeting, San Francisco CA USA, December
Ohta, K., Hirose, K., Shimizu, K., Ohishi, Y.
Metallization in FeO
The High Pressure Conference of Japan, Okinawa pref., Japan, November
[Link]
2010
[Oral]
“Invited talk”
Ohta, K, Hirose, K., Shimizu, K., Lay, T., Ohishi, Y.
Phase transitions in pyrolitic mantle and MORB materials and their electrical conductivities at lowermost mantle
American Geophysical Union Fall Meeting, San Francisco CA USA, December
[Poster]
Ohta, K., Hirose, K., Shimizu, Ohishi, Y.
Electrical conductivities of deep mantle materials
American Geophysical Union Fall Meeting, San Francisco CA USA, December
2009
[Poster]
Ohta, K., Ozawa, H., Hirose, K., Shimizu, K., Sata, N., Ohishi, Y.
Metallization and spin collapse in FeO at high pressure
American Geophysical Union Fall Meeting, San Francisco CA USA, December
Ohta, K., Hirose, K., Shimizu, K., Sata N., Ohishi, Y.
Electrical conductivities of pyrolitic mantle and MORB materials up to the lowermost mantle conditions
Gordon Research Conferences “Interior of the Earth”, South Hadley MA USA, June
2008
[Oral]
Ohta, K., Hirose, K., Shimizu, K., Sata, N., Ohishi, Y.
The electrical conductivities in pyrolitic mantle and MORB
International workshop “Transport properties in the lower mantle”, Tochigi Japan, Octorber
Ohta, K., Onoda, S., Hirose, K., Sinmyo, R., Shimizu, K., Sata, N., Ohishi, Y., Yasuhara, A.
The electrical conductivity of post-perovskite in Earth’s D” layer
European Geosciences Union General Assembly 2008, Vienna Austria, April
2007
[Oral]
Ohta, K., Onoda, S., Hirose, K., Shimizu, K.
The effect of iron spin transition on electrical conductivity of perovskite and magnesiowüstite
17th Annual VM Goldshmidt Conference, Cologne Germany, August
[Poster]
Ohta, K., Hirose, K., Onoda, S., Shimizu, K.
The effect of iron spin transition on electrical conductivity of lower mantle minerals
7th High Pressure Mineral Physics Seminar, Miyagi Japan, May
2006
[Oral]
Ohta, K., Hirose, K., Sata, N., Ohishi, Y.
The sharpness and compositional effects on post-perovskite phase transition
16th Annual VM Goldshmidt Conference, S4-05, Melbourne Australia, August