Results 241 to 250 of about 400,042 (295)
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Journal of Ship Production, 1987
Many shipyards now employ line-heating processes to form metal by controlled heating and cooling. The benefits of line-heat forming include improved accuracy and productivity. The current line-heating method utilizes an oxyacetylene torch as the heat input. A new forming technique that uses a high-power laser as the heat source is being researched. The
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Many shipyards now employ line-heating processes to form metal by controlled heating and cooling. The benefits of line-heat forming include improved accuracy and productivity. The current line-heating method utilizes an oxyacetylene torch as the heat input. A new forming technique that uses a high-power laser as the heat source is being researched. The
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Local Laser- Induced Heat Treatment
1998The laser is a useful tool for the heat treatment in microtechnology mainly for two reasons: Firstly, the beam can be focussed onto a small area thus allowing local heating of very tiny parts. Secondly, heating rates of up to 108 K/s can be achieved for periods from a few nanoseconds to hundreds of milliseconds.
Simeon M. Metev, Vadim P. Veiko
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Semicollisional heat flux in laser heated plasmas
Physics of Plasmas, 2002The semicollisional transport theory in laser heated plasmas is presented. The Fokker–Planck equation that includes the electron–electron interaction up to the first anisotropy is solved numerically for arbitrary collisionality range. The inverse bremsstrahlung absorption of the laser energy by the electrons is taken into account.
A. Tahraoui, A. Bendib
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Optics Communications, 1990
Abstract An externally heated CuBr laser is described. Output power up to 17.5 W and efficiency up to 1.23% are achieved. The CuBr laser provides 1125 h laser generation at 6 W power level and 955 h at 11 W power level (total above 2080 h). The CuBr losses are 0.045 g/h at power level 6 W and 0.085 g/h at power level 11 W.
O.R. Marazov, E.G. Manev
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Abstract An externally heated CuBr laser is described. Output power up to 17.5 W and efficiency up to 1.23% are achieved. The CuBr laser provides 1125 h laser generation at 6 W power level and 955 h at 11 W power level (total above 2080 h). The CuBr losses are 0.045 g/h at power level 6 W and 0.085 g/h at power level 11 W.
O.R. Marazov, E.G. Manev
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Modelling laser heating effects
ICALEO '82: Proceedings of the Materials Processing Symposium, 1982The results shown here are some preliminary studies in the co-operative development of a 3D finite difference model of the laser heating process. Two models are currently under investigation that derived at Imperial College and that at the University of Illinois.
P. Henry +4 more
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Pulse Laser Heating of Blood Vessels
Therapeutic Laser Applications and Laser-Tissue Interactions II, 2005A computer model of blood vessel heating by pulse laser irradiation incident on the upper skin layer (epidermis) is suggested. The model is a multilayered half-infinite structure. The depths, optical (absorption and scattering), mechanical and thermal-optical properties of layers are in agreement with the real properties of epidermis and dermis of skin.
Liudmila Astafyeva +2 more
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Journal of Applied Physics, 1993
Simple expressions were derived for the temperature rise at the surface of a thick medium under sustained laser irradiation. These were employed to estimate the thermal contributions to property measurements in a few simple representative scenarios.
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Simple expressions were derived for the temperature rise at the surface of a thick medium under sustained laser irradiation. These were employed to estimate the thermal contributions to property measurements in a few simple representative scenarios.
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Short Pulse Laser Heated Plasma Experiments
Nuclear Fusion, 1973The interaction between time-tailored, high-intensity laser radiation and spherical light-element targets is investigated. Simultaneous measurements of the laser plasma electron temperature, charged-particle distribution, absorbed energy, neutron yields and backscattered light intensity and spectra were made.
J. Soures, L.M. Goldman, M. Lubin
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Laser-induced local heating of multilayers
Applied Optics, 1982For a multilayer structure illuminated by a laser beam, absorption of optical energy in the absorptive layers and the diffusion of the resultant heat throughout the structure are studied. Analytical and numerical procedures for this study are described, and, as a specific example, the profiles of temperature distribution during recording on a ...
M, Mansuripur +2 more
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LASER SPECKLE PHOTOGRAPHY FOR HEAT TRANSFER
Experimental Thermal and Fluid Science, 1993ABSTRACT Laser speckle photography, as a technique making use of the displacement of optical speckle by refraction as information carrier, is recently used to measure fluid density, temperature and heat transfer. The concept of laser speckle photography and the measuring principle of temperature gradient field are briefly described.
Zeng-Yuan Guo, Yao-Zu Song
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