Results 41 to 50 of about 2,703,297 (196)

Entropy change at the martensitic transformation in ferromagnetic shape memory alloys Ni_{2+x}Mn_{1-x}Ga

, 2003
The entropy change $\Delta S$ between the high-temperature cubic phase and the low-temperature tetragonally-based martensitic phase of Ni$_{2+x}$Mn$_{1-x}$Ga ($x = 0 - 0.20$) alloys was studied.
K. Oikawa, Khovailo V. V., Khovailo V. V., Matsumoto M., Obradó E., Pelegrina J. L., T. Abe, T. Takagi, V. V. Khovailo   +8 more
core   +1 more source

Dynamical Quantum Phase Transitions in the Transverse Field Ising Model [PDF]

, 2013
A phase transition indicates a sudden change in the properties of a large system. For temperature-driven phase transitions this is related to non-analytic behavior of the free energy density at the critical temperature: The knowledge of the free energy ...
A. Polkovnikov, J. B. Conway, M. Heyl, M. E. Fisher, S. Kehrein, S. Sachdev   +5 more
core   +2 more sources

Analysis of trends in phase change enthalpy, entropy and temperature for alkanes, alcohols and fatty acids

Chemical Physics Impact, 2023
In this work, relationships for enthalpy changes and entropy changes associated with phase transitions, specifically for alkanes, alcohols, and fatty acids, were investigated.
Harald Mehling, Mary Anne White
doaj   +1 more source

Energy spectrum and phase diagrams of two-sublattice hard-core boson model [PDF]

, 2013
The energy spectrum, spectral density and phase diagrams have been obtained for two-sublattice hard-core boson model in frames of random phase approximation approach.
Stasyuk, I. V., Vorobyov, O.
core   +4 more sources

Raman signatures of inversion symmetry breaking and structural phase transition in type-II Weyl semimetal MoTe2

, 2016
Transition metal dichalcogenide MoTe$_2$ is an important candidate for realizing the newly predicted type-IIWeyl fermions, for which the breaking of the inversion symmetry is a prerequisite. Here we present direct spectroscopic evidence for the inversion
Bao, Changhua, Deng, Ke, Feng, Ji, Gu, Qiangqiang, Li, Yuan, Ren, Xiao, Wu, Yang, Zhang, Haoxiong, Zhang, Kenan, Zhou, Shuyun   +9 more
core   +1 more source

Test of Two Phase Change Materials for Thermal Energy Storage: Determination of the Global Heat Transfer Coefficient

ChemEngineering, 2018
Laboratory scale experiments on the behaviour of two phase change materials, a salt and a paraffin, during fusion and solidification cycling processes, were accomplished.
Luís Esteves, Ana Magalhães, Victor Ferreira, Carlos Pinho   +3 more
doaj   +1 more source

First Principles Molecular Dynamics Study of CdS Nanostructure Temperature-Dependent Phase Stability [PDF]

, 2008
First principles molecular dynamics simulations are used to determine the relative stability of wurtzite, graphitic, and rocksalt phases of the CdS nanostructure at various temperatures.
Melnik, Roderick V.N., Wen, Bin
core   +2 more sources

Thermal Storage Capacity and Night Ventilation Performance of a Solar Chimney Combined with Different PCMs

International Journal of Photoenergy, 2017
Thermal storage capacity and airflow rate of a solar chimney combined with different PCMs are numerically studied during nighttime. PCMs with phase change temperatures of 38°C, 44°C, 50°C, and 63°C are selected in this numerical study.
Jun Lu, Xiaolong Gao, Qianru Li, Yongcai Li   +3 more
doaj   +1 more source

Temperature-driven topological quantum phase transitions in a phase-change material Ge2Sb2Te5 [PDF]

Scientific Reports, 2016
AbstractThe Ge2Sb2Te5 is a phase-change material widely used in optical memory devices and is a leading candidate for next generation non-volatile random access memory devices which are key elements of various electronics and portable systems. Despite the compound is under intense investigation its electronic structure is currently not fully understood.
Eremeev, Sergey V., Rusinov, Igor P., Echenique, Pedro M., Chulkov, Eugene V.   +3 more
openaire   +3 more sources

Experimental and numerical study on the model of hybrid fiber phase change concrete frozen shaft wall.

PLoS ONE
In this study, phase change materials (PCMs) were innovatively incorporated into hybrid fiber concrete. The properties of PCMs, which absorb and release heat during phase transitions, enable the concrete to actively respond to complex and varying ...
Dongwei Li, Zhiwen Jia, Zecheng Wang, Kaixi Xue, Zhenhua Wang, Fang Fang   +5 more
doaj   +1 more source