Weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.

Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.

Daily newspaper from Perry, Oklahoma that includes local, state, and national news along with advertising.

Weekly Jewish newspaper from Fort Worth, Texas that includes local, state, and national news along with extensive advertising.

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 …

Weekly newspaper from Aransas Pass, Texas that includes local, state, and national news along with advertising.

Biweekly student newspaper from St. Mary's University in San Antonio, Texas that includes campus news along with advertising.

Semiweekly newspaper from Pawhuska, Oklahoma that includes local, state, and national news along with advertising.

Semiweekly newspaper from Pawhuska, Oklahoma that includes local, state, and national news along with advertising.

Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.

Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.

Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.

Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.

Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.

Daily newspaper from Sapulpa, Oklahoma that includes local, state, and national news along with advertising.

Monthly newspaper from Stephenville, Texas that includes news and information on the Texas dairy industry along with advertising.

Weekly newspaper from Tulia, Texas that includes local, state and national news along with extensive advertising.

Weekly newspaper from Stamford, Texas that includes local, state, and national news along with advertising.

Weekly newspaper from Albany, Texas that includes local, county, and state news along with extensive advertising.

Semi-weekly newspaper from Burleson, Texas that includes local, state, and national news along with advertising.

Weekly newspaper from Mannford, Oklahoma that includes local, state, and national news along with advertising.

Weekly newspaper from Tulsa, Oklahoma that includes local, state, and national news along with advertising.

Semi-weekly newspaper from Burleson, Texas that includes local, state, and national news along with advertising.

Bi-monthly newsletter of Congregation Beth Yeshurun in Houston, including news and events, upcoming services, member announcements, editorials, and other information of interest to congregants. This issue discusses two concerts featuring Cantor George Wagner, Cantor David Propis, pianist Rakhil Kleynerman, and flutist Amy Winn.