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formation pathways in molecular clouds; Ultraviolet photolysis of CO-HO iceHirayama, Akemi*; Arakawa, Ichiro*; Yamakawa, Koichiro
Astrophysical Journal, 951(2), p.132_1 - 132_12, 2023/07
Times Cited Count：0 Percentile：0.00(Astronomy & Astrophysics)With use of reflection-absorption infrared spectroscopy, we investigated the binary ice of CO and HO at 10 K under ultraviolet irradiation as an analogue of interstellar ice mantle. We employed H
O instead of H
O to distinguish the formation pathways of CO, and prepared mixed-ice samples under CO- and HO-rich conditions as well as bilayered one, where CO was condensed on HO ice. After the ultraviolet irradiation onto any sample, we detected infrared absorption bands of CO and COO, which were generated through the CO-CO and CO-HO reactions, respectively. We analyzed the irradiation-time dependence of the CO and COO column densities in CO-rich ice to determine the effective cross sections of the CO formation through the CO-CO and CO-HO reactions simultaneously.
Sasaki, Hirokazu*; Nishikubo, Hideo*; Nishida, Shinsuke*; Yamazaki, Satoshi*; Nakasaki, Ryusuke*; Isomatsu, Takemi*; Minato, Ryuichiro*; Kinugawa, Kohei*; Imamura, Akihiro*; Otomo, Shinya*; et al.
Furukawa Denko Jiho, (138), p.2 - 10, 2019/02
no abstracts in English
Muramatsu, Kazuhiro; Imamura, Toshiyuki; Kitabata, Hideyuki; Kaneko, Isamu; Takemiya, Hiroshi*; Hasegawa, Yukihiro*; Yamagishi, Nobuhiro*; Hirayama, Toshio
Keisan Kogaku Koenkai Rombunshu, 6(1), p.241 - 244, 2001/05
no abstracts in English
Imamura, Toshiyuki; Muramatsu, Kazuhiro; Kitabata, Hideyuki*; Kaneko, Isamu*; Yamagishi, Nobuhiro*; Hasegawa, Yukihiro*; Takemiya, Hiroshi*; Hirayama, Toshio
Joho Shori Gakkai Kenkyu Hokoku 2001-ARC-142, p.49 - 54, 2001/03
no abstracts in English
Takemiya, Hiroshi*; Imamura, Toshiyuki; Koide, Hiroshi; Higuchi, Kenji; Tsujita, Yuichi; Yamagishi, Nobuhiro*; Matsuda, Katsuyuki*; Ueno, Koichi*; Hasegawa, Yukihiro*; Kimura, Toshiya; et al.
Proceedings of 4th International Conference on Supercomputing in Nuclear Applications (SNA 2000) (CD-ROM), 16 Pages, 2000/09
no abstracts in English
Hasegawa, Yukihiro*; Yamagishi, Nobuhiro*; Takemiya, Hiroshi*; Hirayama, Toshio; Shirai, Hiroshi; Shimizu, Katsuhiro; Ozeki, Takahisa
Keisan Kogaku Koenkai Rombunshu, p.365 - 368, 2000/05
no abstracts in English
Ueno, Koichi*; Ota, Hirofumi*; Takemiya, Hiroshi*; Imamura, Toshiyuki; Koide, Hiroshi; Matsuda, Katsuyuki*; Higuchi, Kenji; Hirayama, Toshio
JAERI-Data/Code 2000-023, p.287 - 0, 2000/03
JAERI-Data-Code-2000-023.pdf:34.96MB
no abstracts in English
Takemiya, Hiroshi*; Yamagishi, Nobuhiro*; Imamura, Toshiyuki; Ueno, Koichi*; Koide, Hiroshi; Tsujita, Yuichi; Hasegawa, Yukihiro*; Higuchi, Kenji; Matsuda, Katsuyuki*; Hirayama, Toshio
JAERI-Data/Code 2000-013, p.52 - 0, 2000/03
JAERI-Data-Code-2000-013.pdf:8.64MB
no abstracts in English
Ueno, Koichi*; Ota, Hirofumi*; Takemiya, Hiroshi*; Imamura, Toshiyuki; Koide, Hiroshi; Matsuda, Katsuyuki*; Higuchi, Kenji; Hirayama, Toshio
JAERI-Data/Code 2000-012, p.125 - 0, 2000/03
JAERI-Data-Code-2000-012.pdf:19.49MB
no abstracts in English
Takemiya, Hiroshi*; Yamagishi, Nobuhiro*; Imamura, Toshiyuki; Ueno, Koichi*; Koide, Hiroshi; Tsujita, Yuichi; Hasegawa, Yukihiro*; Higuchi, Kenji; Matsuda, Katsuyuki*; Hirayama, Toshio
JAERI-Data/Code 2000-010, p.49 - 0, 2000/02
JAERI-Data-Code-2000-010.pdf:2.04MB
no abstracts in English
Takemiya, Hiroshi; Ota, Hirofumi; Imamura, Toshiyuki; Koide, Hiroshi; Matsuda, Katsuyuki; Higuchi, Kenji; Hirayama, Toshio; Kasahara, Hironori*
Keisan Kogaku Koenkai Rombunshu, 4(1), p.333 - 336, 1999/05
no abstracts in English
Hirayama, Akemi*; Arakawa, Ichiro*; Yamakawa, Koichiro
no journal, ,
Molecular clouds are composed of gases and interstellar dust. The dust is covered with an ice mantle containing a variety of molecules such as HO and CO and is exposed to ultraviolet radiation. In the present study, we investigated the photochemical reaction in the ice mantle utilizing isotopologues.
Teshima, Naoya; Takemiya, Hiroshi; Nakajima, Norihiro; Hirayama, Toshio
no journal, ,
We are carrying on R&D about the grid computing that is able to offer the computer resources that a user needed plural computers connected on a network like one computer. Now we evolve ITBL middleware developed by ITBL project which is a national project started in 2001 and forward R&D of AEGIS(Atomic Energy Grid InfraStructure) as the grid computing infrastructure which is necessary for the atomic energy research. We analyzed the knowledge provided for R&D of ITBL. And we thought that it was essential to lower the threshold of grid computing by upgrading of the client API library for AEGIS when the user applied his applications to grid computing. Now we are hierarchically developing the client API library for AEGIS from the low level layer such as certification or communication to the high level layer, for example, parameter survey API for parametric study type applications.
Nakajima, Norihiro; Suzuki, Yoshio; Nishida, Akemi; Kushida, Noriyuki; Teshima, Naoya; Takemiya, Hiroshi; Hirayama, Toshio
no journal, ,
With technology to offer the computer resources that a user needed plural computers connected on a network like one computer, the simulation of the field of atomic energy which cooperated with an experiment institution or the database, is developed. Such a technology is so called grid technology, was in use in form such as ITBL and AEGIS. The simulation in the nuclear fusion energy technology and a fast breeder cycle need the larger and a mass of calculation is necessary. In this presentation, some examples are reported such as earthquake proofing calculation, nuclear fusion calculation, and so on.
Takemiya, Hiroshi; Kushida, Noriyuki; Nakajima, Norihiro; Hirayama, Toshio
no journal, ,
In this presentation, applicability of heterogeneous multicore processors for a high-speed stability analysis of nuclear plasmas is discussed. Researchers in the nuclear fusion field are trying to realize a real-time plasma control by the high-speed stability analysis of nuclear plasmas based on the monitoring data from sensors equipped on a reactor. In the case of ITER, the stability analysis of nuclear plasmas should be performed within a second, because the characteristic time scale of plasmas in ITER is about several seconds. In order to satisfy this time limit, we are trying to use heterogeneous multi-core processors for the stability analysis. In this talk, we talk about the possibility of real-time stability analysis of plasmas based on the preliminary performance results of heterogeneous multi-core processors.
formation pathways in CO-HO ice films under ultraviolet irradiationYamakawa, Koichiro; Hirayama, Akemi*; Arakawa, Ichiro*
no journal, ,
CO is one of the abundant molecules in the ice mantles, and the following two formation channels have been discussed: (1) reaction of two CO molecules, one of which is electronically excited by UV light; (2) reaction of CO with the OH radical which is a dissociation product of HO. We focused on the fact that these two channels can be distinguished from each other by isotope labeling, i.e., by employing H
O instead of H
O. In the present study, we investigated the UV photolysis of CO-HO ice and determined the effective rates of the CO formation channels with use of isotope labeling and infrared spectroscopy.
Suzuki, Yoshio; Nishida, Akemi; Yamada, Tomonori; Araya, Fumimasa; Hayashi, Sachiko; Nakajima, Norihiro; Hirayama, Toshio
no journal, ,
Our challenge is to estimate the validity of simulation results by establishing "Cerebral Methodology Based Computing (CMC)". The estimation of the validity is indispensable to accurately predict phenomena by using simulation. It is difficult to estimate the validity from a single simulation because the simulation contains uncertainties and ambiguities. We have proposed CMC as the computing methodology which enables us to estimate the validity of results with both deductive and inductive approaches, similar to the human thinking process. To realize CMC, we have constructed the system which enables us to execute both deductive simulations and inductive simulations, and then combine results of those simulations in an integration process. We have applied the system to a thermal displacement analysis of a nuclear power plant and confirmed the usefulness of the system.
Kushida, Noriyuki; Teshima, Naoya; Takemiya, Hiroshi; Nakajima, Norihiro; Hirayama, Toshio
no journal, ,
In the present paper, the methodology of interoperability between ITBL and Grid-TLSE is described. Grid-TLSE is an expert website to provides user assistance in choosing the right solver for its problems and appropriate values for the control parameters of the selected solve. The time to solution of linear equation solver strongly depends on the type of problem, the selected algorithm, its implementation and the target computer architecture. Grid-TLSE uses the Diet middleware to distribute computing tasks over the Grid. Therefore, extending the variety of computer architecture by Grid middleware interoperability between Diet and ITBL has a beneficial impact to the expert system. To show the feasibility of the methodology, job transfering program as a special service of Diet was developed.
