Self-consistent modeling for estimation of the reduced electric field in a DC excited diffusion controlled CW CO2 laser

2016 ◽  
Vol 81 ◽  
pp. 77-83 ◽  
Author(s):  
Manoj Kumar ◽  
M.S. Bhagat ◽  
A.K. Biswas ◽  
L.B. Rana ◽  
Jagdish Pakhare ◽  
...  
Keyword(s):  
Electric Field ◽  
Co2 Laser ◽  
Diffusion Controlled ◽  
Self Consistent ◽  
Cw Co2 Laser

Investigations on cw CO2-laser induced welding plasmas using differential interferometry

1999 ◽  
Author(s):  
Henrik Schittenhelm ◽  
Jürgen Müller ◽  
Peter Berger ◽  
Helmut Hügel
Keyword(s):  
Co2 Laser ◽  
Differential Interferometry ◽  
Cw Co2 Laser

Spatial temperature distribution in CW CO2 laser photosensitized reactions

1984 ◽  
Vol 49 (6) ◽  
pp. 1354-1359 ◽  
Author(s):  
Pavel Kubát ◽  
Josef Pola
Keyword(s):  
Temperature Distribution ◽  
Chemical Reactions ◽  
Co2 Laser ◽  
Computational Procedure ◽  
Heat Convection ◽  
Inert Gas ◽  
Spatial Temperature Distribution ◽  
Cw Co2 Laser ◽  
Spatial Temperature

The temperature distribution in gaseous SF6 and SF6-inert gas samples under irradiation with cw CO2 laser measured by a thermocouple technique is confronted with the results of a computational procedure neglecting heat convection. The results are helpful in understanding the effect of the inert gas on the distribution of temperature and the size of the reacting hot volume in the cw laser-photosensitized chemical reactions.

Cw CO2 laser driven oxidation of some perhalogenocycloalkenes

1991 ◽  
Vol 56 (2) ◽  
pp. 398-405 ◽  
Author(s):  
Josef Pola ◽  
Jaroslav Včelák ◽  
Zdeněk Chvátal
Keyword(s):  
Co2 Laser ◽  
Total Pressure ◽  
Diels Alder ◽  
Title Reaction ◽  
Consecutive Reactions ◽  
Cw Co2 Laser

The title reaction of hexafluorocyclobutene, 1,2-dichloro-3,3,4,4-tetrafluorocyclobutene and decafluorocyclohexene studied at total pressure 13.3 and 16 kPa yield oxalyl halides COX.COX (X = F, Cl) and C2F4 that undergo consecutive reactions to COF2, CO and X2. The oxidation of decafluorocyclohexene is preceded by retro-Diels-Alder decomposition affording hexafluorocyclobutene and C2F4. Two alternative mechanisms for the oxidation of the cyclobutenes are presented, one involving a novel cleavage of intermediary bicyclic dioxetanes. The decomposition of oxalyl fluoride into COF2 and CO is favored over its oxidation.

Influence of a radial inhomogeneity of the active medium on the output radiation power from a cw CO2 laser with fast axial flow

1996 ◽  
Author(s):  
Michail G. Galushkin ◽  
Vladimir S. Golubev ◽  
V. V. Dembovetsky ◽  
Yuri N. Zavalov ◽  
Valentina Y. Zavalova
Keyword(s):  
Active Medium ◽  
Co2 Laser ◽  
Radiation Power ◽  
Axial Flow ◽  
Output Radiation ◽  
Radial Inhomogeneity ◽  
Cw Co2 Laser ◽  
Output Radiation Power

ChemInform Abstract: CW CO2 Laser Driven Oxidation of Some Perhalogenocycloalkenes.

ChemInform ◽  
2010 ◽  
Vol 22 (25) ◽  
pp. no-no
Author(s):  
J. POLA ◽  
J. VCELAK ◽  
Z. CHVATAL
Keyword(s):  
Co2 Laser ◽  
Cw Co2 Laser

Activation and cleaning of oxide surfaces by a cw CO2 laser

1984 ◽  
Vol 136 (1) ◽  
pp. L19-L24 ◽  
Author(s):  
Alison D. Abbate ◽  
Tomoji Kawai ◽  
C.Bradley Moore ◽  
Chi-Tsung Chin
Keyword(s):  
Co2 Laser ◽  
Oxide Surfaces ◽  
Cw Co2 Laser

Irradiation of CW-CO2 laser on a powder target. Formation of fullerene film from graphite powder

2003 ◽  
Vol 378 (5-6) ◽  
pp. 474-480 ◽  
Author(s):  
Seisuke Kano ◽  
Masamichi Kohno ◽  
Kaname Sakiyama ◽  
Shinya Sasaki ◽  
Nobuhiro Aya ◽  
...  
Keyword(s):  
Co2 Laser ◽  
Graphite Powder ◽  
Powder Target ◽  
Cw Co2 Laser

A polycrystal hysteresis model for ferroelectric ceramics

2006 ◽  
Vol 462 (2069) ◽  
pp. 1573-1592 ◽  
Author(s):  
Y Su ◽  
G.J Weng
Keyword(s):  
Electric Field ◽  
Hysteresis Loop ◽  
Ferroelectric Properties ◽  
Electric Displacement ◽  
Hysteresis Loops ◽  
Ferroelectric Ceramics ◽  
Domain Growth ◽  
Thermodynamic Approach ◽  
Hysteresis Model ◽  
Self Consistent

Most key elements of ferroelectric properties are defined through the hysteresis loops. For a ferroelectric ceramic, its loop is contributed collectively by its constituent grains, each having its own hysteresis loop when the ceramic polycrystal is under a cyclic electric field. In this paper, we propose a polycrystal hysteresis model so that the hysteresis loop of a ceramic can be calculated from the loops of its constituent grains. In this model a micromechanics-based thermodynamic approach is developed to determine the hysteresis behaviour of the constituent grains, and a self-consistent scheme is introduced to translate these behaviours to the polycrystal level. This theory differs from the classical phenomenological ones in that it is a micromechanics-based thermodynamic approach and it can provide the evolution of new domain concentration among the constituent grains. It also differs from some recent micromechanics studies in its secant form of self-consistent formulation and in its application of irreversible thermodynamics to derive the kinetic equation of domain growth. To put this two-level micromechanics theory in perspective, it is applied to a ceramic PLZT 8/65/35, to calculate its hysteresis loop between the electric displacement and the electric field ( D versus E ), and the butterfly-shaped longitudinal strain versus the electric field relation ( ϵ versus E ). The calculated results are found to be in good quantitative agreement with the test data. The corresponding evolution of new domain concentration c 1 and the individual hysteresis loops of several selected grains—along with those of the overall polycrystal—are also illustrated.

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