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Physics of Phonons in Amorphous C-S-Hs.

Zhou, Yun.

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Physics of Phonons in Amorphous C-S-Hs.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Physics of Phonons in Amorphous C-S-Hs./
Author:	Zhou, Yun.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2016,
Description:	31 p.
Notes:	Source: Masters Abstracts International, Volume: 55-05.
Contained By:	Masters Abstracts International55-05(E).
Subject:	Mechanical engineering. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10117012
ISBN:	9781339784151

Physics of Phonons in Amorphous C-S-Hs.
Zhou, Yun.

Physics of Phonons in Amorphous C-S-Hs. - Ann Arbor : ProQuest Dissertations & Theses, 2016 - 31 p.

Source: Masters Abstracts International, Volume: 55-05.

Thesis (M.S.)--University of California, Irvine, 2016.

In this master thesis, we have probed the heat transport in C-S-Hs by both molecular dynamics simulations and phonon eigenvalue analyses. Green-Kubo method is used in molecular dynamics simulations to compute the heat flux and thermal conductivity in C-S-Hs. Noting that C-S-H is relatively amorphous, both propagating modes and nonpropagating modes of phonons are considered in analytical analyses. Bose-Einstein transport equation is used to compute the contribution to the total thermal conductivity from each propagating eigenmode of phonon vibration, while AF theory is applied to investigate the nonpropagating modes of C-S-H. GULP analyses have been performed on C-S-H samples, giving us the eigenfrequencies and eigenvectors of phonons in the system. The participation ratios, group velocities, relaxation times and mode diffusivities of phonons are studied. After comparing our simulation results with analytical analyses, we found that the heat transport phenomenon in amorphous C-S-Hs can be well explained by the combination of BTE equation and AF theory.

ISBN: 9781339784151Subjects--Topical Terms:

649730
Mechanical engineering.

Physics of Phonons in Amorphous C-S-Hs.
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100 1 $a Zhou, Yun. $3 1265226
245 1 0 $a Physics of Phonons in Amorphous C-S-Hs.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2016
300 $a 31 p.
500 $a Source: Masters Abstracts International, Volume: 55-05.
500 $a Adviser: Jaeho Lee.
502 $a Thesis (M.S.)--University of California, Irvine, 2016.
520 $a In this master thesis, we have probed the heat transport in C-S-Hs by both molecular dynamics simulations and phonon eigenvalue analyses. Green-Kubo method is used in molecular dynamics simulations to compute the heat flux and thermal conductivity in C-S-Hs. Noting that C-S-H is relatively amorphous, both propagating modes and nonpropagating modes of phonons are considered in analytical analyses. Bose-Einstein transport equation is used to compute the contribution to the total thermal conductivity from each propagating eigenmode of phonon vibration, while AF theory is applied to investigate the nonpropagating modes of C-S-H. GULP analyses have been performed on C-S-H samples, giving us the eigenfrequencies and eigenvectors of phonons in the system. The participation ratios, group velocities, relaxation times and mode diffusivities of phonons are studied. After comparing our simulation results with analytical analyses, we found that the heat transport phenomenon in amorphous C-S-Hs can be well explained by the combination of BTE equation and AF theory.
590 $a School code: 0030.
650 4 $a Mechanical engineering. $3 649730
650 4 $a Materials science. $3 543314
690 $a 0548
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710 2 $a University of California, Irvine. $b Mechanical and Aerospace Engineering. $3 2093977
773 0 $t Masters Abstracts International $g 55-05(E).
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792 $a 2016
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10117012