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    題目:固體材料熱輸運性質的第一性計算的研究及在地球物理及材料科學中的應用
    報告人:Prof. Jianjun Dong (Auburn University)
    時  間:2015年7月16日上午9:00
    地  點:西城校區教1-102
    
    We have developed a series of highly efficient and massive-parallel computational algorithms to predict lattice thermal conductivity of a wide range of solid materials from first-principles theory. First, I will discuss some details of our current computational methods and the direction for future development. Then I will present some latest applications in Earth science and Materials science. Anchoring on our latest first-principles calculations of lattice thermal conductivity of MgO and MgSiO3 perovskite crystals, I will present our latest assessment of lower mantle thermal conductivity with additional evaluations of the Fe-bearing lower mantle mineral solid solutions, and the radiative contribution to diffusive heat transfer. We find that the overall thermal conductivity is approximately constant at 3 W/m/K throughout the lower mantle. This significant downward adjustment of lower mantle thermal conductivity values implies that the mantle has a blanketing effect on heat flow coming out of the Earth’s core, thus slowing the Earth’s thermal evolution. Furthermore, our computational methods can be also adopted in materials sciences to help to design high efficient  thermoelectric materials.
 
    董建軍教授, 1992年本科畢業于北京大學物理系, 1998年在Ohio University 獲得物理學博士學位,自2000年在Auburn University (奧本大學)任教。現為物理系的Walter 講座正教授 (Thomas and Jean Walter Endowed Professor of Physics)及主管研究生錄取及教學的Graduate Program Officer。近幾年其主要研究方向為復雜固體材料的第一性計算,包括地球礦物在高壓高溫條件下的熱輸運性質的計算和模擬。曾在Science, PNAS, PRL 和GRL等一流雜志發表多篇文章。其研究工作長期獲得美國NSF,DOE和NASA的資助。

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時間:2015-07-15
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