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Long term modeling of the links between economics, technical progress and environment: Evolution of approaches and new trends
This paper examines the evolution of modeling on greenhouse as emissions. The paper briefly highlights the origins and early efforts to model greenhouse gas emissions, efforts subsequent to 1988, and the shape of the next generation of greenhouse gas emissions models. Particular emphasis is placed on the author`s own contributions, including the Edmonds-Reilly Model and the second generation model.
Date:
October 1, 1992
Creator:
Edmonds, J.
System:
The UNT Digital Library
Long term modeling of the links between economics, technical progress and environment: Evolution of approaches and new trends
This paper examines the evolution of modeling on greenhouse as emissions. The paper briefly highlights the origins and early efforts to model greenhouse gas emissions, efforts subsequent to 1988, and the shape of the next generation of greenhouse gas emissions models. Particular emphasis is placed on the author's own contributions, including the Edmonds-Reilly Model and the second generation model.
Date:
October 1, 1992
Creator:
Edmonds, J.
System:
The UNT Digital Library
Tip-tilt compensation: Resolution limits for ground-based telescopes using laser guide star adaptive optics. Revision 2
The angular resolution of long-exposure images from ground-based telescopes equipped with laser guide star adaptive optics systems is fundamentally limited by the the accuracy with which the tip-tilt aberrations introduced by the atmosphere can be corrected. Assuming that a natural star is used as the tilt reference, the residual error due to tilt anisoplanatism can significantly degrade the long-exposure resolution even if the tilt reference star is separated from the object being imaged by a small angle. Given the observed distribution of stars in the sky, the need to find a tilt reference star quite close to the object restricts the fraction of the sky over which long-exposure images with diffraction limited resolution can be obtained. In this paper, the authors present a comprehensive performance analysis of tip-tilt compensation systems that use a natural star as a tilt reference, taking into account properties of the atmosphere and of the Galactic stellar populations, and optimizing over the system operating parameters to determine the fundamental limits to the long-exposure resolution. Their results show that for a ten meter telescope on Mauna Kea, if the image of the tilt reference star is uncorrected, about half the sky can be imaged in the V …
Date:
October 8, 1992
Creator:
Olivier, S. S.; Max, C. E.; Gavel, D. T. & Brase, J. M.
System:
The UNT Digital Library