Studies on Grass Productivity of Steep Mountainous Grassland (IV) A Comparison of Grass-Ladino Clover Mixures as Pastures for Young Steers on Steep Mountainous Grassland

急傾斜山地草地の不耕起造成用草種としてのオーチャードグラス,トールフェスク,レッドトップの各草地にラジノクローバを混播した時の家畜の生産性と草地植生の影響を調査し,急傾斜山地草地におけるラジノクローバ混播に関する知見をうるために,1970年と1971年の2か年間,黒毛和種若令去勢牛を用いて放牧実験を行なった. 得られた結果の概要は次のとおりである. 1)放牧期間中の1目1頭当たり増体量の2か年間の平均はオーチャードグラス・クローバ草地620g,卜ールフェスク・クローバ草地621g,レッドトップ・クローバ草地615gであった. 2)イネ科単播草地ヘクローバを混播することによって増体盤の増加がみとめられた. 3)オーチャードグラスとトールフェスク草地ではクローバの混播により裸地が著しく減少したが,レッドトップ草地では余り影響がみられなかった. 4)レッドトップ・クローバ草地ではクローバが優勢化しやすく放牧牛に鼓脹症の発生がみられた. 5)肥沃条件下ではレッドトップにラジノクローバを混播することは余りこのましくない

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

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