Results 261 to 270 of about 123,905 (309)
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SPIE Proceedings, 2006
Beam correction of high power lasers often requires large wavefront deformations with very slow rates of change. Adaptive Optics Associates, Inc. (AOA) has developed a new type of deformable mirror in which thermal expansion of tubes control the mirror's figure. This paper is the subject of a patent disclosure.
Carlos A. Caicedo +5 more
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Beam correction of high power lasers often requires large wavefront deformations with very slow rates of change. Adaptive Optics Associates, Inc. (AOA) has developed a new type of deformable mirror in which thermal expansion of tubes control the mirror's figure. This paper is the subject of a patent disclosure.
Carlos A. Caicedo +5 more
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Thermal conductivity of deformed potassium chloride
Physical Review B, 1989The thermal conductivities of plastically deformed KCl crystals weremeasured in the temperature range 0.02--10 K. The measurements indicatethat thermal phonons are scattered strongly by dislocations. Heat-pulsemeasurements support this interpretation. The thermal conductivity of adeformed KCl sample is restored by ..gamma.. irradiation, suggesting that
, Yang, , Anderson
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Thermally activated deformation. II. Deformation of sintered iron
Journal of Applied Physics, 1974The atomic processes associated with the plastic deformation of commercial-quality sintered iron were investigated. Stress relaxation tests were carried out over the 17–19-kg mm−2 range of initial stress levels at room temperature. The experimental results were analyzed with the deformation kinetics theory discussed in Paper I. The analysis showed that
T. O'D. Hanley, A. S. Krausz, N. Krishna
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A self-correction method for deformable mirror with thermal deformation
Optik, 2017Abstract In high-power laser systems, temperature gradient distribution arises in optical components irradiated by a high-power continuous wave (CW) laser, leading to the thermal deformation of the optical components and further the degradation of the beam quality.
Xiaochuan Hu +3 more
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Thermal Expansion and Deformation of Graphene
Chinese Physics Letters, 2016Taking into consideration short-atomic-range interactions and anharmonic effects, we calculate the thermal expansion coefficients, Gruneisen parameters, the elastic modulus of graphene varying with temperature and the phonon frequency. The anharmonic effects associated with the graphene deformation are also discussed. The results show that the value of
Zheng-Fu Cheng, Rui-Lun Zheng
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Thermal Deformations of Solid Mirrors
Applied Optics, 1970The tensor equations of elasticity including temperature terms in nonorthogonal coordinates are presented in a form suitable for the method of dynamic relaxation. A nonorthogonal coordinate system that includes a wide class of circular solid mirrors or lenses is described.
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Thermally Activated Deformation of Potassium
physica status solidi (b), 1967AbstractThe thermally activated deformation of single crystal and polycrystalline potassium is examined. It is shown that the activation parameters describing low‐temperature deformation can be correlated reasonably well with the b.c.c. transition metals on the basis of their respective shear moduli.
I . M. Bernstein, J . C. M. Li
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Deformation of Graphite by Thermal Cycling
Journal of Applied Physics, 1963The dimensional changes which occur when graphite specimens are thermally cycled under constant torque have been measured. It is shown that internal stresses due to the anisotropic thermal expansion of individual component crystallites cause strain increments to appear which are a function of the temperature change—not of the absolute temperature.
G. M. Jenkins, G. K. Williamson
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Coupling of elastic and thermal deformations I
Applied Scientific Research, 1958The general solution for the stress and temperature distribution in an isotropic thermoelastic solid occupying the half space has been given when the classical heat conduction equation is suitably modified to take into account the effect of variation of strain on the variation of temperature, the boundary of the solid being assumed to be stress-free ...
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Thermal deformation of helical gears
SPIE Proceedings, 2010The analytical equation for the thermal field of a helical gear under normal working condition in a stable thermal field is established using mathematical physics, and the thermal deformation of the gear can be computed using this equation. The variations of gear geometric parameters, such as radial dimension, tooth depth, spiral angle, pressure angle,
Yong Zhang, Ye-tai Fei, Shan-lin Liu
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