scholarly journals Magnetohydrodynamical simulation of the formation of clumps and filaments in quiescent diffuse medium by thermal instability

2016 ◽  
Vol 459 (2) ◽  
pp. 1803-1818 ◽  
Author(s):  
C. J. Wareing ◽  
J. M. Pittard ◽  
S. A. E. G. Falle ◽  
S. Van Loo
Keyword(s):  
Thermal Instability ◽  
Diffuse Medium

scholarly journals Thermal instability in the wind of Wolf-Rayet stars

1999 ◽  
Vol 193 ◽  
pp. 238-239
Author(s):  
Denise R. Gonçalves ◽  
Vera Jatenco-Pereira ◽  
Reuven Opher
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Thermal Instability ◽  
Stable Equilibrium ◽  
Narrow Range ◽  
Alfven Wave ◽  
Early Type ◽  
Wave Heating ◽  
Early Type Stars ◽  
Diffuse Medium

In this study, we investigate the formation of clumps at the base of the wind of early-type stars via thermal instability in the presence of Alfvén wave heating. As a result we show the existence of two stable equilibrium regions, one at high temperature, the diffuse medium, and another at low temperature, the clumps. We show that the two stable equilibrium regions can coexist over a narrow range of pressures describing the diffuse medium and the clumps.

TEM study of Cosi2 formation via annealing of Co-Ti bilayers on Si

1995 ◽  
Vol 53 ◽  
pp. 464-465
Author(s):  
N. David Theodore ◽  
Andre Vantomme ◽  
Peter Crazier
Keyword(s):  
Thermal Instability ◽  
Lattice Mismatch ◽  
Field Effect Transistors ◽  
Contact Layer ◽  
Interface Roughness ◽  
Oxide Semiconductor ◽  
Surface Layers ◽  
Silicide Layer ◽  
Small Lattice ◽  
Buried Layers

Contact is typically made to source/drain regions of metal-oxide-semiconductor field-effect transistors (MOSFETs) by use of TiSi2 or CoSi2 layers followed by AI(Cu) metal lines. A silicide layer is used to reduce contact resistance. TiSi2 or CoSi2 are chosen for the contact layer because these silicides have low resistivities (~12-15 μΩ-cm for TiSi2 in the C54 phase, and ~10-15 μΩ-cm for CoSi2). CoSi2 has other desirable properties, such as being thermally stable up to >1000°C for surface layers and >1100°C for buried layers, and having a small lattice mismatch with silicon, -1.2% at room temperature. During CoSi2 growth, Co is the diffusing species. Electrode shorts and voids which can arise if Si is the diffusing species are therefore avoided. However, problems can arise due to silicide-Si interface roughness (leading to nonuniformity in film resistance) and thermal instability of the resistance upon further high temperature annealing. These problems can be avoided if the CoSi2 can be grown epitaxially on silicon.

scholarly journals Dynamical structure of highly eccentric discs with applications to tidal disruption events

2020 ◽  
Vol 500 (3) ◽  
pp. 4110-4125
Author(s):  
Elliot M Lynch ◽  
Gordon I Ogilvie
Keyword(s):  
Thermal Instability ◽  
Vertical Structure ◽  
Scale Height ◽  
Accretion Discs ◽  
Radiative Cooling ◽  
Dynamical Structure ◽  
Tidal Disruption ◽  
The Subject ◽  
Stable Solutions ◽  
Physical Quantities

ABSTRACT Whether tidal disruption events circularize or accrete directly as highly eccentric discs is the subject of current research and appears to depend sensitively on the disc thermodynamics. One aspect of this problem that has not received much attention is that a highly eccentric disc must have a strong, non-hydrostatic variation of the disc scale height around each orbit. As a complement to numerical simulations carried out by other groups, we investigate the dynamical structure of TDE discs using the non-linear theory of eccentric accretion discs. In particular, we study the variation of physical quantities around each elliptical orbit, taking into account the dynamical vertical structure, as well as viscous dissipation and radiative cooling. The solutions include a structure similar to the nozzle-like structure seen in simulations. We find evidence for the existence of the thermal instability in highly eccentric discs dominated by radiation pressure. For thermally stable solutions many of our models indicate a failure of the α-prescription for turbulent stresses. We discuss the consequences of our results for the structure of eccentric TDE discs.

Thermal Instability in Pool Boiling on Wires at Constant Pressure

1983 ◽  
Vol 43 (6) ◽  
pp. 1294-1309 ◽  
Author(s):  
G. Joly ◽  
J. P. Kernevez ◽  
M. Llory
Keyword(s):  
Thermal Instability ◽  
Constant Pressure ◽  
Pool Boiling
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