Evidence of the Prominent Role of the Time-Under-Melt Parameter in the Reset Switching of Phase-Change Line Cells

2008 ◽  
Author(s):  
L. Goux ◽  
T. Gille ◽  
D. Tio Castro ◽  
G. A. M. Hurkx ◽  
J. G. Lisoni ◽  
...  
Keyword(s):  
Phase Change

scholarly journals The role of phase change materials for the sustainable energy

2016 ◽  
Vol 10 ◽  
pp. 00068 ◽  
Author(s):  
Marta Kuta ◽  
Dominika Matuszewska ◽  
Tadeusz Michał Wójcik
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Sustainable Energy

Role of the nano amorphous interface in the crystallization of Sb2Te3 towards non-volatile phase change memory: insights from first principles

2014 ◽  
Vol 16 (22) ◽  
pp. 10810 ◽  
Author(s):  
Xue-Peng Wang ◽  
Nian-Ke Chen ◽  
Xian-Bin Li ◽  
Yan Cheng ◽  
X. Q. Liu ◽  
...  
Keyword(s):  
Phase Change ◽  
First Principles ◽  
Phase Change Memory ◽  
Volatile Phase ◽  
Change Memory

scholarly journals Role of Phase Change Materials Containing Carbonized Rice husks on the Roof-Surface and Indoor Temperatures for Cool Roof System Application

Molecules ◽  
2020 ◽  
Vol 25 (14) ◽  
pp. 3280
Author(s):  
Hong Gun Kim ◽  
Yong-Sun Kim ◽  
Lee Ku Kwac ◽  
Mira Park ◽  
Hye Kyoung Shin
Keyword(s):  
Thermal Conductivity ◽  
Phase Change ◽  
Phase Change Materials ◽  
Paraffin Wax ◽  
Heat Absorption ◽  
Rice Husks ◽  
Indoor Temperature ◽  
Cool Roof ◽  
Plastic Composites

This study researches the effect of phase change materials (PCMs) containing carbonized rice husks (CRHs) in wood plastic composites (WPCs) as roof finishing materials on roof-surface and indoor temperatures. A cool roof miniature model was prepared, and measurements were taken using three fixed temperatures of 30 to 32 °C, 35 to 37 °C, and 40 to 42 °C. Sodium sulfate decahydrate (Na2SO4·10H2O) and paraffin wax were selected as the PCMs. CRHs were used as additives to improve the thermal conductivities of the PCMs. At lower fixed temperatures such as 30 to 32 °C and 35 to 37 °C, the rates of increase of the surface temperatures of roofs containing CRHs with Na2SO4·10H2O, and paraffin wax, were observed to gradually decrease compared to those of the roofs without PCMs. The indoor temperatures for the above-mentioned PCMs containing CRHs were maintained to be lower than those of the indoors without PCMs. Additionally, as the CRH content in the PCM increased, the rates of increase of the roof-surface and indoor temperatures decreased due to a faster roof heat absorption by PCMs through the improved thermal conductivity of CRHs. However, under higher artificial temperatures such as 40 to 42 °C, Na2SO4·10H2O with CRHs exhibited no effect due to being out of latent heat range of Na2SO4·H2O. For paraffin wax, as CRH content increased, their roof- surface and indoor temperatures decreased. Especially, the surface temperature of the roof containing paraffin contained 5 wt.% CRHs reduced by 11 °C, and its indoor temperature dropped to 26.4 °C. The thermal conductivity of PCM was enhanced by the addition of CRHs. A suitable PCM selection in each location can result in the reduction of the roof-surface and indoor temperatures.

scholarly journals Origin of resistivity contrast in interfacial phase-change memory: The crucial role of Ge/Sb intermixing

2019 ◽  
Vol 114 (13) ◽  
pp. 132102 ◽  
Author(s):  
Yuta Saito ◽  
Alexander V. Kolobov ◽  
Paul Fons ◽  
Kirill V. Mitrofanov ◽  
Kotaro Makino ◽  
...  
Keyword(s):  
Phase Change ◽  
Crucial Role ◽  
Phase Change Memory ◽  
Interfacial Phase ◽  
Change Memory

Understanding the role of Zn in improving the phase change behaviors of Sb2Te3 films

2015 ◽  
Vol 585 ◽  
pp. 57-65 ◽  
Author(s):  
Guoxiang Wang ◽  
Xiang Shen ◽  
Yegang Lu ◽  
Shixun Dai ◽  
Qiuhua Nie ◽  
...  
Keyword(s):  
Phase Change ◽  
Change Behaviors ◽  
Role Of Zn

The Metal-Dielectric Transition in Short-Pulse Laser Ablation of Metals

Volume 4 ◽  
2004 ◽  
Author(s):  
Cristian Porneala ◽  
David A. Willis
Keyword(s):  
Laser Ablation ◽  
Absorption Coefficient ◽  
Phase Change ◽  
Pulse Laser ◽  
Pulse Laser Ablation ◽  
Short Pulse ◽  
Phase Explosion ◽  
Short Pulse Laser ◽  
Dielectric Transition

Phase explosion is an explosive liquid-vapor phase change that occurs during short pulse laser ablation. Phase explosion results from homogenous vapor nucleation in a superheated liquid phase as the surface temperature approaches the thermodynamic critical temperature, Tc. For a metastable liquid, the upper limit of superheating is approximately 0.9Tc, above which the rate of homogeneous nucleation rises dramatically. Prior to reaching the superheat limit however, a “dielectric transition” is expected to occur at approximately 0.8Tc. The dielectric transition is the transition of an electrically conductive material to a non-conducting state due to large fluctuations in material properties. One consequence of the dielectric transition is that the material will become semi-transparent. Until now, little work has been performed to understand the role of the dielectric transition in laser ablation, and many questions remain about how the surface will rise above 0.8Tc if the surface is semitransparent and only weakly absorbing. This work investigates the role of the dielectric transition with a one-dimensional numerical model for heat transfer and phase change and includes the effect of the metal to dielectric transition. The model is used to simulate heating of aluminum by a Nd:YAG laser with a 7 nanosecond pulse width (FWHM) at the fundamental wavelength of 1064 nm. Calculations of the transient temperature field, melt depth, and depth of the dielectric layer are obtained. Estimates of the absorption coefficient of a metal surface above the metal-dielectric transition are made from correlations found in the research literature. The value of the absorption coefficient is shown to be a critical parameter for determining the energy density required to reach 0.9Tc.

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