 |
 |
 |
 |
 |
 |
||
 |
 |
 |
 |
 |
| 5 | 1/1 | 返回列表 |
| 查看: 3677 | 回復: 12 | |||
| 當前只顯示滿足指定條件的回帖，點擊這里查看本話題的所有回帖 | |||
[交流]
A PhD student position 已有5人參與
|
|||
|
A PhD student position in high-pressure experimental geoscience at Bayerisches Geoinstitut, University of Bayreuth, Germany The Bayerisches Geoinstitut, University of Bayreuth, Germany, is seeking a talented and highly motivated PhD candidate to be working in the domain of high-pressure experimental geosciences in the frame of the research grant of Prof. Dr. Tomoo Katsura by German Research Foundation (DFG). In this project, Si self-diffusion coefficients of Fe-free and Fe-bearing single-crystal wadsleyite will be determined as a function of temperature and water content, as is described in the separate page. This position is for three years and available from October 2014. Applicants should have a master or equivalent degree, knowledge of solid earth science, and basic background of physics, chemistry and mathematics in the level of the first year of college. Experience of high pressure and temperature experiments is not required. The working language is English, and knowledge of German language is unnecessary. Review of applications and successive evaluation will continue until the position is filled. Applications should include a CV in the “europass” format, a concise but concrete summary of master thesis, copies of transcript and certificates, and a personal letter concisely describing yourself and your research interest, and be sent by email to the following address. Further information should be directed to Prof. Katsura directly. Prof. Dr. Tomoo Katsura Professor of Structure and Dynamics of Earth Materials Director of Bayerisches Geoinstitut, University of Bayreuth 95440 Bayreuth, GERMANY Tel: +49(0)921 553791, Fax: +49(0)921 553769 Email: Tomo.Katsura@unibayreuth.de Title: Measurement of Si self-diffusion coefficients of wadsleyite as a function of temperature and water content Project description: Dynamic motion in the mantle accounts for a wide variety of geological and geophysical phenomena. Understanding dynamic mantle flow is therefore essential for solid-state geophysics. Rock deformation experiments have shown a large decrease in the creep strength of mantle minerals by hydration. However, deformation experiments are technically difficult, and the inherent lack of control on key parameters makes interpretation of experimental results problematic. Measurements of Si self-diffusion coefficients have the potential to provide an essential and independent source of information about the high-temperature rheology of minerals, because the slow high-temperature creep of silicate minerals should be controlled by Si self-diffusion. We have studied the effect of water on the Si self-diffusion of forsterite [Fei et al., 2013]. This study suggests that the effect of water on mantle rheology is much smaller than previously considered; although the water content exponent on the olivine rheology was considered to be 1.2, it is actually only 0.3. This striking conclusion should be extended by examining other important mantle minerals. Wadsleyite is a dominant constituent mineral in the mantle transition zone. In this study, we will measure Si self-diffusion coefficient of both Fe-free and Fe-bearing wadsleyite with water contents from <1 to 1000 ppm at temperatures of 1400 and 1600 K, determining them as a function of temperature and water content. In this kind of study, use of single crystal samples is essential for reliable measurement. We will synthesize wadsleyite single crystals based on the techniques developed in our previous study [Shatskiy et al., 2009]. The measurement of Si self-diffusion coefficients of wadsleyite will be conducted by following those in our previous study for forsterite [Fei et al., 2012; 2013]. For the iron-bearing samples, pre-annealing and diffusion annealing will be conducted under constant oxygen fugacity buffered by Mo + MoO2. Based on the results of this project, we will examine and improve our understanding of the effects of water on mantle rheology. This work will provide important insights required to properly understand the dynamic behavior of the mantle. References Fei, H. Z., C. Hegoda, D. Yamazaki, M. Wiedenbeck, H. Yurimoto, S. Shcheka, and T. Katsura (2012), High silicon self-diffusion coefficient in dry forsterite, Earth Planet. Sci. Lett., 345, 95-103. Fei, H., M. Wiedenbeck, D. Yamazaki & T. Katsura (2013), Small effect of water on upper-mantle rheology based on silicon self-diffusion coefficients, Nature, 498(7453), 213-215. Shatskiy, A., K. D. Litasov, T. Matsuzaki, K. Shinoda, D. Yamazaki, A. Yoneda, E. Ito, and T. Katsura (2009), Single crystal growth of wadsleyite, Am. Miner., 94(8 |
回復此樓» 猜你喜歡
天津理工大學-新能源研究院-國家海外優(yōu)青韓久慧教授-26年博士招生-材料、化學等領域
已經有1人回復
-
天津理工大學-新能源研究院-國家海外優(yōu)青韓久慧教授-26年博士招生-材料、化學等領域
已經有1人回復
-
半導體科學與信息器件論文潤色/翻譯怎么收費?
已經有81人回復
-
085400數一英一 354分 求調劑 本科211 一志愿天津某985
已經有1人回復
-
085400 354分求調劑 一志愿天津大學 本科211
已經有0人回復
-
微納加工設備
已經有0人回復
-
上海交通大學集成電路學院納米電子和光電器件研究組招收博士生
已經有1人回復
-
上海交通大學集成電路學院納米電子和光電器件團隊招聘教師和博士后
已經有0人回復
-
上海交通大學集成電路學院納米電子和光電器件團隊招收博士生
已經有0人回復
-
天津理工大學-國家海外優(yōu)青韓久慧教授-26年博士招生-材料、化學等領域
已經有0人回復
送紅花一朵
 |
8樓2014-06-10 13:40:12
zhaoligood
專家顧問 (正式寫手)
Chemical NMRer
-
專家經驗: +63 - 應助: 45 (小學生)
- 金幣: 4691.3
- 散金: 1190
- 紅花: 35
- 帖子: 1000
- 在線: 321.7小時
- 蟲號: 555223
- 注冊: 2008-05-08
- 性別: GG
- 專業(yè): 結構化學
- 管轄: 留學DIY
2樓2014-06-05 15:20:35
3樓2014-06-05 17:20:46
4樓2014-06-05 19:03:17
| 最具人氣熱帖推薦 [查看全部] | 作者 | 回/看 | 最后發(fā)表 | |
|---|---|---|---|---|
|
[考研] 330一志愿中國海洋大學 化學工程 085602 有讀博意愿 求調劑 +3 | wywy.. 2026-03-27 | 4/200 |
|
|---|---|---|---|---|
|
|
[考研] 266分，求材料冶金能源化工等調劑 +5 | 哇呼哼呼哼 2026-03-27 | 7/350 |
|
|
|
[考研] 考研調劑 +4 | Sanmu-124 2026-03-26 | 4/200 |
|
|
[考研]
 一志愿 西北大學 總分282 英語一62 求調劑
+7
|
18419759900 2026-03-25 | 8/400 |
|
|
|
[考研] 307求調劑 +8 | 超級伊昂大王 2026-03-24 | 9/450 |
|
|
|
[考研] 085600材料與化工調劑 +10 | A-哆啦Z夢 2026-03-23 | 16/800 |
|
|
|
[考研] 085600，材料與化工321分，求調劑 +9 | 大饞小子 2026-03-27 | 9/450 |
|
|
|
[考研] 0703一志愿9，初試成績：338，四六級已過，有科研經歷，求調劑！ +3 | Zuhui0306 2026-03-25 | 3/150 |
|
|
|
[碩博家園] 招收生物學/細胞生物學調劑 +3 | IceGuo 2026-03-26 | 4/200 |
|
|
|
[考研] 調劑求收留 +7 | 果然有我 2026-03-26 | 7/350 |
|
|
|
[考研] 333求調劑 +6 | wfh030413@ 2026-03-23 | 6/300 |
|
|
|
[考研] 化學工程085602 305分求調劑 +17 | RichLi_ 2026-03-25 | 17/850 |
|
|
|
[考研] 一志愿北京化工大學材料與化工（085600）296求調劑 +9 | 稻妻小編 2026-03-26 | 9/450 |
|
|
|
[考研] 材料科學與工程 317求調劑 +4 | JKSOIID 2026-03-26 | 4/200 |
|
|
|
[考研] 化學調劑一志愿上海交通大學336分-本科上海211 +4 | 小魚愛有機 2026-03-25 | 4/200 |
|
|
|
[考研] 生物技術與工程 +3 | 1294608413 2026-03-25 | 4/200 |
|
|
|
[考研] 材料專碩找調劑 +5 | 哈哈哈吼吼吼哈 2026-03-23 | 5/250 |
|
|
|
[考研] 080500求調劑 +3 | zzzzfan 2026-03-24 | 3/150 |
|
|
|
[考研] 070300，一志愿北航320求調劑 +3 | Jerry0216 2026-03-22 | 5/250 |
|
|
|
[考研] 一志愿深大，0703化學，總分302，求調劑 +4 | 七月-七七 2026-03-21 | 4/200 |
|