Threshold Energies for the Melting of Si And Al during Pilsed-Laser Irradiation

1984 ◽  
Vol 35 ◽  
Author(s):  
C.K. Ong ◽  
H.S. Tan ◽  
E.H. Sin
Keyword(s):  
Experimental Data ◽  
Thermal Properties ◽  
Heat Flow ◽  
Laser Irradiation ◽  
Pulsed Laser ◽  
Temperature Dependent ◽  
Melting Threshold ◽  
Experimental Values ◽  
Threshold Energies

ABSTRACTThe heat flow calculations have been performed to obtain the threshold energies for the melting of Si and Al during pulsed-laser irradiations under various laser conditions. The temperature dependent optical and thermal properties of the solids are deduced from the available experimental data. The melting threshold energies calculated for the solids are within the accuracy of the experimental values.

Interface Temperatures and Temperature Gradients in Silicon During Pulsed Laser Irradiation

1988 ◽  
Vol 100 ◽  
Author(s):  
B. C. Larson ◽  
J. Z. Tischler ◽  
D. M. Mills
Keyword(s):  
Heat Flow ◽  
Laser Irradiation ◽  
Thermal Strain ◽  
Pulsed Laser ◽  
Laser Pulses ◽  
Temperature Gradients ◽  
X Ray Diffraction ◽  
X Ray ◽  
High Gradients ◽  
Pulsed Laser Irradiation

ABSTRACTNanosecond-resolution x-ray diffraction has been used to measure the interface and lattice temperatures of silicon during rapid, pulsed-laser induced melting and regrowth in silicon. Measurements have been carried out on <100> and <111> oriented silicon using the (100) and (111) reflections to measure the thermal strain during 30 ns, 1.1 J/cm2 KrF laser pulses. The results indicate overheating to be low (< 2 K/m/s) for both orientations with undercooling rates of 5.6 K/m/s and 11.4 K/m/s for the <100> and <111> orientations, respectively. Observations of higher than expected temperature gradients below the liquidsolid interface have been discussed in terms of restricted heat flow under high gradients.

The electrical resistivities of the palladium-silver alloys

1962 ◽  
Vol 267 (1328) ◽  
pp. 139-145 ◽  
Keyword(s):  
Experimental Data ◽  
Alloy System ◽  
Residual Resistivity ◽  
Temperature Dependent ◽  
Silver Alloys ◽  
Dependent Part ◽  
Electrical Resistivities ◽  
Temperature Dependent Resistivity ◽  
Experimental Values ◽  
Pure Palladium

New measurements of resistivity as a function of com position and temperature have been made for this alloy system . Using the theoretical model proposed by Mott for s-d scattering, and experimental values for the density of states at the Fermi surface, we have calculated both the residual resistivity and temperature-dependent resistivity with very few arbitrary parameters. Striking agreement with experiment is obtained, all the features of the experimental data being reproduced except for the behaviour of the temperature-dependent part of the resistivity near pure palladium , which is ascribed to the onset of some contribution to conduction by d -band holes.

A variable property heat transfer model for predicting soil temperature profiles during simulated wildland fire conditions

2008 ◽  
Vol 17 (2) ◽  
pp. 205 ◽  
Author(s):  
Ebenezer K. Enninful ◽  
David A. Torvi
Keyword(s):  
Heat Transfer ◽  
Thermal Properties ◽  
Wildland Fire ◽  
Heat Fluxes ◽  
Transfer Model ◽  
Temperature Dependent ◽  
Heat Penetration ◽  
Experimental Values ◽  
Temperature Dependent Properties ◽  
Plant Shoots

A numerical model of heat transfer in dry soil was developed to predict temperatures and depth of lethal heat penetration during cone calorimeter tests used to simulate wildland fire exposures. The model was used to compare predictions made using constant and temperature-dependent thermal properties with experimental results for samples of dry sand exposed to heat fluxes of 25, 50 and 75 kW m–2. Depths of lethal heat penetration predicted using temperature-dependent properties were within 2 to 10% of the values determined using measured temperatures, while predictions made using constant properties were within 10 to 21% of the experimental values. In both cases, predictions made by the model were within the 1-cm accuracy with which the depth of seeds and plant shoots in the soil can be determined in practice. The model generally over-predicted the depth of lethal heat penetration in dry or moist soil when temperature-dependent properties were used, and over-predicted the depth of lethal heat penetration in soils with a moisture content of greater than 10% if constant thermal properties were used.

Computer Simulation of Heat Flow Induced by Laser Irradiation in Presence of Heat Sinks or Sources

1992 ◽  
Vol 279 ◽  
Author(s):  
Sebastiano Tosto
Keyword(s):  
Computer Simulation ◽  
Thermal Properties ◽  
Heat Flow ◽  
Laser Irradiation ◽  
Thermal Field ◽  
Heat Sinks ◽  
Heat Sources ◽  
Local Phase ◽  
Additional Energy ◽  
Heating And Cooling

ABSTRACTThe paper concerns the computer simulation of heat flow induced on matter by laser irradiation in presence of heat sources or sinks. The model is 3D analytical and accounts for the dependence of thermal properties of matter on temperature. The results describe in particular the effect of a heat source due to a local phase change or solid state reaction releasing energy in a point of the laser affected zone. The purpose of the paper is to evidence how this additional energy affects the thermal field and then the heating and cooling rates. PACS 47.25.-Qv

scholarly journals Temperature Dependence of Thermoelastic Properties for NaCl Crystal

2014 ◽  
Vol 2014 ◽  
pp. 1-3
Author(s):  
Kuldeep Kholiya ◽  
Jeewan Chandra
Keyword(s):  
Experimental Data ◽  
Thermal Expansion ◽  
Bulk Modulus ◽  
Volume Expansion ◽  
Close Agreement ◽  
Present Model ◽  
Harmonic Approximation ◽  
Temperature Dependent ◽  
Thermoelastic Properties ◽  
Experimental Values

Recently developed isothermal Kholiya’s EOS is modified to study the temperature dependent volume expansion and applied for NaCl crystal. The results obtained with the present model are in quite close agreement to the experimental values. The model is therefore extended to study the variation of bulk modulus and the coefficient of volume thermal expansion with temperature. Comparison of the obtained results with the experimental data demonstrates that an isothermal EOS may also be modified to study the temperature dependent elastic properties. The present study also reveals that the quasi harmonic approximation, that is, the product of bulk modulus and the coefficient of volume thermal expansion as constant, is valid in case of NaCl crystal.

Modification of structural and transport properties in epitaxial YBa2CU3Ox films by pulsed laser irradiation

1993 ◽  
Vol 3 (12) ◽  
pp. 2173-2188
Author(s):  
N. G. Chechenin ◽  
A. V. Chernysh ◽  
V. V. Korneev ◽  
E. V. Monakhov ◽  
B. V. Seleznev
Keyword(s):  
Transport Properties ◽  
Laser Irradiation ◽  
Pulsed Laser ◽  
Pulsed Laser Irradiation

PULSED LASER IRRADIATION OF NICKEL THIN FILMS ON SILICON

1983 ◽  
Vol 44 (C5) ◽  
pp. C5-449-C5-454 ◽  
Author(s):  
P. Baeri ◽  
M. G. Grimaldi ◽  
E. Rimini ◽  
G. Celotti
Keyword(s):  
Thin Films ◽  
Laser Irradiation ◽  
Pulsed Laser ◽  
Nickel Thin Films ◽  
Pulsed Laser Irradiation
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