Wide-Field Camera for Gravitational Microlensing Survey: MOA-cam2     

Toshifumi Yanagisawa  Yasushi Muraki  Yutaka Matsubara  Fumio Abe  Kimiaki Masuda  Sachiyo Noda  Takahiro Sumi  Yuji Kato  Mitsuaki Fujimoto  Shuji Sato  Ian Bond  Nicholas Rattenbury  Philip Yock  Pam Kilmartin  John Hearnshaw  Micheal Reid  Denis Sullivan  Brian Carter  Richard Dodd  Garry Nankivell  Noiman Rumsey  Morihiro Honda  Maki Sekiguchi  Masanori Yoshizawa  Takashi Nakamura  Humitaka Sato  Seiji Kabe  Makoto Kobayashi  Yoshiyuki Watase  Jun Jugaku  Toshiharu Saito  Barbel Koribalsky 《Experimental Astronomy》2000,10(4):519-535

We have constructed a large, mosaic CCD camera called MOA-cam2 which has 4096 × 6144-pixelsto search for gravitational microlensing events. MOA-cam2 has three4096 × 2048-pixel SITe CCD chips, which have a very high quantum efficiency (nearly 80% in the wave region 500 to 800 nm),and three buttable sides. We have placed the threechips side by side with 100 m dead space. MOA-cam2 has been installed on the 61 cm Boller and Chivens telescope of the MOA collaboration at the Mt. John University Observatory (MJUO) in NewZealand since July 1998. The field coverage is 0.92° × 1.38° per exposure. The technical details of MOA-cam2 and the first images obtained with the Boller and Chivens telescope are presented. MOA-cam2 introduces a second phase of research on gravitational microlensing by the MOA collaboration.  相似文献   

Synthesis of analcime from volcanic sediments in sodium silicate solution     

Hiroshi Abe  Morihiro Aoki  Hiroshi Konno 《Contributions to Mineralogy and Petrology》1973,42(2):81-92

Analcime has been synthesized from natural rhyolitic tuff and green tuff (Miocene age) at 200° C and 20 kg/cm² with solution of Na₂SiO₃ (12%) in 50- to 260-hr runs. From the diffraction intensities, it was found that the alteration products of green tuff contained more analcime than those of rhyolitic tuff. It has been concluded that the lithological character of starting materials and the chemical behavior of reaction products are important controlling factors in analcimization.  相似文献   

霞浦湖沉积物需氧速率的研究   总被引：6，自引：1，他引：5  

范成新  相崎守弘  福岛武彦  松重一夫 《海洋与湖沼》1998,29(5):508-513

１９９５年２月,用大口径采样器采集日本霞浦湖土浦湾和湖心柱状沉积物样品,在２０℃恒温蔽光封闭条件下,研究了该湖泊沉积物需氧（ＳＯＤ）速率及实验前后上覆水和间隙水中形态营养物浓度变化,结果表明,实验初期（０－５ｈ）ＳＯＤ速率随时间呈线性上升,大于５ｈ后呈非线性下降,对线性部分计算的ＳＯＤ速率约在０．６－１．８ｍｇ／（ｍ＾２．ｄ）之间,实验发现,上覆水和表层间隙水中形态营养物Ｆｅ（Ⅱ）,ＮＨ＾＋４－Ｎ  相似文献   

好氧和厌氧条件对霞浦湖沉积物-水界面氮磷交换的影响   总被引：55，自引：4，他引：55  

范成新  相崎守弘 《湖泊科学》1997,9(4):337-342

在实验室控制条件下，研究了日本霞浦湾和湖心区底泥中形态氮磷，在好氧和厌氧条件下水土界面交换量变化及差异，结果表明；好氧条件下，ＮＯ＾－３－Ｎ，ＮＯ＾－２－Ｎ，ＮＨ＾＋４，－Ｎ，和ＰＯ＾３－４－Ｐ均有释放作用产生，量值多数较小，ＤＴＮ和ＤＴＰ则净释放作用接近零；厌氧条件下，ＮＯ＾－３－Ｎ和ＮＯ＾－２－Ｎ呈负释放状态，ＮＨ＾＋４－Ｎ和ＰＯ＾３－４－Ｐ的释放速率是好氧条件下的２－８倍。  相似文献