5月16日（火）13：30～15:00 太陽系小天体セミナー 南棟２階会議室
May 16 tue Solar System Minor Body Seminar Conference Room, South Bldg.2F
5月17日（水）10：30～12：00 総研大コロキウム 中央棟 講義室
May 17 wed SOKENDAI colloquium Lecture Room
5月17日（水）13：30～14：30 理論コロキウム コスモス会館会議室
May 17 wed DTA colloquium Conference Room, Cosmos Lodge
5月19日（金）13：30～15：00 太陽天体プラズマセミナー コスモス会館会議室
May 19 fri Solar and Space Plasma Seminar Conference Room, Cosmos Lodge
5月19日（金）16：00～17：00 国立天文台談話会 大セミナー室
May 19 fri NAOJ Seminar Large Seminar Room
詳細は以下をご覧下さい。
5月16日（火）
- キャンパス
- 三鷹
- セミナー名
- 太陽系小天体セミナー
- 定例・臨時の別
- 定例
- 日時
- 5月16日（火曜日）13時30分～15時
- 場所
- 南棟２階会議室
- 講演者
- 西田信幸
- 連絡先
-
名前：渡部潤一
- 備考
- テレビ会議またはスカイプによる参加も可
5月17日（水）
- Campus
- Mitaka
- Seminar
- SOKENDAI colloquium
- Regularly Scheduled/Sporadic
- Regular
- Date and time
- May 17 2017, 10:30-12:00
- Place
- Lecture Room
- Speaker1
- Haruka Baba
- Affiliation
- SOKENDAI D3 (Supervisor; Motohide Tamura)
- Title
- Imaging analysis of Taurus Molecular Cloud
- Speaker2
- Hiroyuki Ishikawa
- Affiliation
- SOKENDAI M2 (Supervisor; Takayuki Kotani)
- Title
- Reduction and Future Applications of IRD Data
- Facilitator
- -Name：Misaki Ando
- Comment
- TV conference system is available connecting from Nobeyama, Hawaii, Mizusawa, and Okayama.
5月17日（水）
- Campus
- Mitaka
- Seminar
- DTA colloquium
Regularly Scheduled - Date and time
- 17 May 2017, 13:30-14:30
- Place
- Conference Room, Cosmos Lodge
- Speaker
- Tomohiro Ono
- Affiliation
- Kyoto University
- Title
- Large-scale Gas Vortex Formed by the Rossby Wave Instability
- Abstract
- Large-scale Gas Vortex Formed by the Rossby Wave Instability| Large-scale gas vortexes induced by the Rossby wave instability (RWI) are one of the plausible explanations of the lopsided structures recently observed in several protoplanetary disks. For comparison with the observations, it is important to investigate quantitatively the properties of the vortexes formed by the RWI. However, our knowledge on the properties and outcomes of the RWI has been limited until recent years. We have studied the RWI with linear stability analyses and hydrodynamical simulations using the Athena++ code. As a result of the linear stability analyses, we show that the RWI is one of the shear instabilities which are explained by the interaction between two Rossby waves. We also derive the critical condition for the onset of the RWI in semi-analytic form. From the numerical simulations, we investigate the properties of the vortexes formed by the RWI and discuss possible observational predictions. In my talk, I will present our three results on the RWI: (1) the physical mechanism, (2) the critical condition for the onset and (3) the properties of the vortexes.
- Facilitator
- -Name：Tomoya Takiwaki
- Comment
- in English
5月19日（金）
- Campus
- Mitaka
- Seminar
- Solar and Space Plasma Seminar
- Regularly Scheduled/Sporadic
- Regular
- Date and time
- 19 May (Fri), 13:30-15:00
- Place
- Conference Room, Cosmos Lodge
- Speaker
- Yuto Bekki
- Affiliation
- University of Tokyo
- Title
- Numerical Study of Double-Cell-Type Solar Meridional Circulation Based on a Mean-Field Hydrodynamic Model
- Abstract
- Large-scale solar convectional structures, differential rotation and meridional circulation, play crucial roles in generating and sustaining the solar magnetic fields through the dynamo process. In the framework of flux transport dynamo model, most of the previous kinematic simulations have assumed a single-cell meridional circulation so that equator-ward migration of sunspot groups could be attributed to the equator-ward transport of toroidal magnetic fluxes by the meridional flow at the base of the convection zone. However, several lines of recent helioseismic observations suggest the possibility of a double-cell structure for the meridional circulation with the pole-ward flow at the base, demanding some modifications for the conventional flux transport dynamo model. Therefore, the theoretical investigations on the maintenance mechanism of this double-cell meridional circulation would be regarded as of a great importance. By conducting mean-field hydrodynamic simulations where the effects of the angular momentum transport by the Reynolds stress are parameterized, we calculate the structures of differential rotation and meridional circulation self-consistently and investigate whether or not double-cell meridional circulation could be achieved along with the solar-like differential rotation. As a result, we find out that the steady state with the double-cell meridional circulation can be achieved when the Reynolds stress transports angular momentum upward in the lower convection zone and downward in the upper layer. We confirm that, in the final steady state, the accumulated angular momentum via the Reynolds stress in the middle layer is advected to both the upper and lower part of the convection zone by each of the upper and lower meridional circulation cells, respectively.
- Facilitator
- -Name：Shin Toriumi
- Comment
5月19日（金）
- キャンパス
- 三鷹
- セミナー名
- 国立天文台談話会
- 定例・臨時の別
- 定例
- 日時
- 5月19日（水） 16:00-17:00
- 場所
- 大セミナー室
- 講演者
- 有馬朗人
- 所属
- 武蔵学園
- タイトル
- 日本の科学・技術の発展と停滞
- Abstract
-
1. 科学・技術論文数
2. 科学・技術論文の被引用度 日本の科学・技術論文数や被引用度の発展と停滞の原因は何であるか。
3. 科学研究費補助金の変化
4. 科学技術基本法（1995年）と科学技術基本計画
5. 研究開発費総額の変化 研究費は伸びて来た。しかしこの数年停滞している。これだけが原因か。
6. 国公立大学、国立研究所の法人化の成果と問題点
7. 国公立大学の運営費交付金の減少とその影響
8. 教育費、特に高等教育への公財政支出
9. 結論 - 連絡先
-
-名前：松田 有一