23 research outputs found
DECIGO pathfinder
DECIGO pathfinder (DPF) is a milestone satellite mission for DECIGO (DECi-hertz Interferometer Gravitational wave Observatory) which is a future space gravitational wave antenna. DECIGO is expected to provide us fruitful insights into the universe, in particular about dark energy, a formation mechanism of supermassive black holes, and the inflation of the universe. Since DECIGO will be an extremely large mission which will formed by three drag-free spacecraft with 1000m separation, it is significant to gain the technical feasibility of DECIGO before its planned launch in 2024. Thus, we are planning to launch two milestone missions: DPF and pre-DECIGO. The conceptual design and current status of the first milestone mission, DPF, are reviewed in this article
Current status of space gravitational wave antenna DECIGO and B-DECIGO
Deci-hertz Interferometer Gravitational Wave Observatory (DECIGO) is the
future Japanese space mission with a frequency band of 0.1 Hz to 10 Hz. DECIGO
aims at the detection of primordial gravitational waves, which could be
produced during the inflationary period right after the birth of the universe.
There are many other scientific objectives of DECIGO, including the direct
measurement of the acceleration of the expansion of the universe, and reliable
and accurate predictions of the timing and locations of neutron star/black hole
binary coalescences. DECIGO consists of four clusters of observatories placed
in the heliocentric orbit. Each cluster consists of three spacecraft, which
form three Fabry-Perot Michelson interferometers with an arm length of 1,000
km. Three clusters of DECIGO will be placed far from each other, and the fourth
cluster will be placed in the same position as one of the three clusters to
obtain the correlation signals for the detection of the primordial
gravitational waves. We plan to launch B-DECIGO, which is a scientific
pathfinder of DECIGO, before DECIGO in the 2030s to demonstrate the
technologies required for DECIGO, as well as to obtain fruitful scientific
results to further expand the multi-messenger astronomy.Comment: 10 pages, 3 figure
The status of DECIGO
DECIGO (DECi-hertz Interferometer Gravitational wave Observatory) is the planned Japanese space gravitational wave antenna, aiming to detect gravitational waves from astrophysically and cosmologically significant sources mainly between 0.1 Hz and 10 Hz and thus to open a new window for gravitational wave astronomy and for the universe. DECIGO will consists of three drag-free spacecraft arranged in an equilateral triangle with 1000 km arm lengths whose relative displacements are measured by a differential Fabry-Perot interferometer, and four units of triangular Fabry-Perot interferometers are arranged on heliocentric orbit around the sun. DECIGO is vary ambitious mission, we plan to launch DECIGO in era of 2030s after precursor satellite mission, B-DECIGO. B-DECIGO is essentially smaller version of DECIGO: B-DECIGO consists of three spacecraft arranged in an triangle with 100 km arm lengths orbiting 2000 km above the surface of the earth. It is hoped that the launch date will be late 2020s for the present
ゲンパツセイ ハイガン ノ ジュウカク ナラビニ ハイモン リンパセツ テンイ ニ カンスル チョウオンパ ナイシキョウ シンダン ト CT シンダン トノ ヒカク ケントウ
Current status of space gravitational wave antenna DECIGO and B-DECIGO
The Deci-hertz Interferometer Gravitational Wave Observatory (DECIGO) is a future Japanese space mission with a frequency band of 0.1 Hz to 10 Hz. DECIGO aims at the detection of primordial gravitational waves, which could have been produced during the inflationary period right after the birth of the Universe. There are many other scientific objectives of DECIGO, including the direct measurement of the acceleration of the expansion of the Universe, and reliable and accurate predictions of the timing and locations of neutron star/black hole binary coalescences. DECIGO consists of four clusters of observatories placed in heliocentric orbit. Each cluster consists of three spacecraft, which form three Fabry–Pérot Michelson interferometers with an arm length of 1000 km. Three DECIGO clusters will be placed far from each other, and the fourth will be placed in the same position as one of the other three to obtain correlation signals for the detection of primordial gravitational waves. We plan to launch B-DECIGO, which is a scientific pathfinder for DECIGO, before DECIGO in the 2030s to demonstrate the technologies required for DECIGO, as well as to obtain fruitful scientific results to further expand multi-messenger astronomy
Special Issue on Financial Systems: UDC 681.172.2-52: 681.322 Software for AT-400N Automated Teller Machine
We developed the AT-400N automated teller machine by reconstructing embedded ATM software, which was formerly developed with a dedicated OS / dedicated language, with a general purpose OS / general purpose language. This machine has WOSA/XFS, which can insure the portability of Oki software to ATM platforms made by other manufacturers. To improve productivity and maintainability, an object oriented development method was used for the middle software layer, where ATM core processing is executed. 1
Catalytic Hydrosilylation of Alkenes by Iron Complexes Containing Terpyridine Derivatives as Ancillary Ligands
Iron complexes formulated as Fe(terpy)X<sub>2</sub> (terpy = 2,2′:6′,2″-terpyridine derivatives;
X = Cl, Br) were prepared and their catalytic activities for hydrosilylation
of olefin with hydrosilane were examined. Although Fe(terpy)X<sub>2</sub> did not show catalytic activity, the treatment of Fe(terpy)X<sub>2</sub> with NaHBEt<sub>3</sub> caused catalytic activity. The influence
of substituents in terpy on the catalytic activity was examined, and
it was found that some complexes with an unsymmetrically disubstituted
terpy selectively produced 1-silylalkane with quite high catalytic
activity. In the reaction of 1-octene with PhSiH<sub>3</sub>, the
double-hydrosilylation product Ph(1-octyl)<sub>2</sub>SiH was
selectively obtained
Catalytic Hydrosilylation of Alkenes by Iron Complexes Containing Terpyridine Derivatives as Ancillary Ligands
Iron complexes formulated as Fe(terpy)X<sub>2</sub> (terpy = 2,2′:6′,2″-terpyridine derivatives;
X = Cl, Br) were prepared and their catalytic activities for hydrosilylation
of olefin with hydrosilane were examined. Although Fe(terpy)X<sub>2</sub> did not show catalytic activity, the treatment of Fe(terpy)X<sub>2</sub> with NaHBEt<sub>3</sub> caused catalytic activity. The influence
of substituents in terpy on the catalytic activity was examined, and
it was found that some complexes with an unsymmetrically disubstituted
terpy selectively produced 1-silylalkane with quite high catalytic
activity. In the reaction of 1-octene with PhSiH<sub>3</sub>, the
double-hydrosilylation product Ph(1-octyl)<sub>2</sub>SiH was
selectively obtained